1 surface appearance
Plastic protective sleeve surface smooth, no lack of material , cracks, damage , burrs , no blistering and uneven ,truck security seals no impurities, variegated and other phenomena was of high quality ; contrary, was of poor quality , substandard .
2 Hardness
Qualified quality spiral protective cover hardness is generally 85-90 degrees Shore hardness is below 85 degrees or above 90 degrees do not meet the requirements. Hardness is too low , you can not play the internal product protection , binding effect ; excessive hardness , when used at low temperatures , protective sleeve prone to embrittlement, 1% to 5 % of the products can not meet the requirements, the spiral protective sleeve the protective effect of internal product is greatly reduced.
3 . Resistance to high temperature
Qualified quality spiral protective cover should have good resistance to high temperature performance. Identification of the user using the following method : turn the screw placed under protective cover 80 ℃ ambient 1 hour , 0.5 hours under room temperature under -40 ℃ environment for 1 hour at room temperature environment 0.5 hours , do it five cycles. Observation, if the spiral protective cover without cracking, sticky, depression occurred, compared with high-quality ; Conversely, if the spiral protective cover cracking , deformation, etc. One sticky or depression phenomena , the protective sleeve is inferior , not qualified.
4 oil resistance
Qualified quality spiral protective sleeve has good oil resistance. The protective sleeve can be soaked in a mixture of the coil 70 # gasoline and 10 percent toluene for 5 minutes , without discoloration phenomenon tacky compared to high- pass ; contrary, discolored , sticky phenomenon , the protective sleeve is poor , failed.
5. Wear
Qualified quality spiral protective sleeve has good wear resistance.
6 tensile strength , impact strength
High- pass coil protection cover has good tensile strength and impact strength, tensile strength at room temperature is generally 25-30Mpa; generally impact strength ( notched ) at room temperature was 35KJ/M2, -40 ℃ / 24h to 5KJ / M, impact strength ( unnotched ) fixed length plastic strap seal, continuously.
7 anti-UV
Spiral protective sleeve has good UV resistance . Protective sleeve black spiral columns must be better than carbon black production , to enhance UV resistance spiral protective sleeve .
8. Antistatic
Spiral protective sleeve is mainly used excavators, loaders, rollers pavers , forklifts , cranes, pumping machinery , outside the protection of cables and other construction machinery and injection molding machine equipment . Underground, dry environment when the job should be considered a strong choice spiral antistatic protective sleeve . Antistatic properties to enhance the internal hydraulic pipe fittings and other products , in a variety of harsh environments of the hydraulic tube play better security role !
high security bolt seals
high security bolt seals
2013年11月5日星期二
Introduction pump mechanical seal standard
This paper summarizes the mechanical seal on the pump standards, including marine mechanical shaft seals, pump mechanical seal alkali, acid pumps with mechanical seals, mechanical seals for pumps and other industry standards.
GB / T 5661-2004 suction centrifugal pumps mechanical seals and for soft packing cavity dimensions
GB / T 5661-2004 suction centrifugal pumps mechanical seals and for soft packing cavity dimensions including compliance with the provisions of GB / T 5662, including horizontal axial suction centrifugal pump of the cascading balanced mechanical seals, suitable for direct axis The mechanical seal and soft packing seal cavity size.
GB / T 3345-88 marine mechanical shaft seal
GB / T 3345-88 marine mechanical shaft seal provides ships with a built-in single shaft seal Unbalanced and balanced built single-end mechanical seal product classification, technical requirements, test methods, inspection rules, marking and packaging .
GB / T 3346-88 marine variable pressure pump mechanical seal
GB / T 3346-88 marine variable pressure pump mechanical seal provides marine variable pressure pump mechanical seal product classification, technical requirements, and test methods, inspection rules, packaging and assurance.
JB / T 7371-1994 alkali pump mechanical seal
JB / T 7371-1994 alkali pump mechanical seal provides alkali pump mechanical seal type, parameters, main dimensions, model species representation, technical requirements, testing and test methods, installation requirements and so on.
JB / T 7371-1994 alkali pump mechanical seal for alkali pump mechanical seal
JB / T 7372-1994 acid pump mechanical seal
JB / T 7372-1994 standard acid pump mechanical seal provides the acid pump mechanical seal with the basic version, the main dimensions, parameters, material, model representation, technical requirements and so on.
JB / T 7372-1994 acid pump mechanical seal for acid pump mechanical seal.
JB / T 1472-1994 pump mechanical seal
JB / T 1472-1994 pump mechanical seal pump mechanical seal provides the basic type, main dimensions, model representation, technical requirements, etc.,
JB / T 1472-1994 pump mechanical seal for rotary mechanical seals and other similar mechanical rotary shaft seal.
JB / T 6614-1993 boiler feed water pump mechanical seal technology
JB / T 6614-1993 boiler feed water pump mechanical truck security seals technology provides for boiler feed water pump mechanical seal of the main types, that is, requirements, testing and test methods, inspection rules and other requirements.
JB / T 6614-1993 boiler feed water pump mechanical seal technology for boiler water temperature no higher than 260 ° C the boiler feed pump seals supporting the use of heavy machinery
JB / T 5966-1995 submersible pump mechanical seal
JB / T 5966-1995 submersible pump mechanical seal provides submersible pump mechanical seal type, parameters and main dimensions, model representation, technical requirements, test methods and inspection rules, installation and use requirements and so on.
JB / T 5966-1995 submersible pump mechanical seal for submersible pumps with mechanical seals.
HG / T 2478-1993 lined pump mechanical seal technology
HG / T 4114-2009 pulp pump mechanical seal technology provides a glass-lined pump mechanical seal design, manufacture, use, testing, marking and installation requirements.
HG / T 4114-2009 pulp pump mechanical luggage seals technology for seal chamber pressure 0 ~ 0.3MPa, Operating Temperature 0 ~ 70 ° C, the shaft speed is less than 3000r/min, 30 ~ 80mm shaft diameter of the bore glass pump mechanical seal (hereinafter referred to as mechanical seal)
HG / T 2100-2003 chlorine liquid ring pump mechanical seal
HG / T 2100-2003 chlorine liquid ring pump mechanical seal provides chlorine liquid ring pump mechanical seal structure type, technical requirements, testing, installation and use.
GB / T 5661-2004 suction centrifugal pumps mechanical seals and for soft packing cavity dimensions
GB / T 5661-2004 suction centrifugal pumps mechanical seals and for soft packing cavity dimensions including compliance with the provisions of GB / T 5662, including horizontal axial suction centrifugal pump of the cascading balanced mechanical seals, suitable for direct axis The mechanical seal and soft packing seal cavity size.
GB / T 3345-88 marine mechanical shaft seal
GB / T 3345-88 marine mechanical shaft seal provides ships with a built-in single shaft seal Unbalanced and balanced built single-end mechanical seal product classification, technical requirements, test methods, inspection rules, marking and packaging .
GB / T 3346-88 marine variable pressure pump mechanical seal
GB / T 3346-88 marine variable pressure pump mechanical seal provides marine variable pressure pump mechanical seal product classification, technical requirements, and test methods, inspection rules, packaging and assurance.
JB / T 7371-1994 alkali pump mechanical seal
JB / T 7371-1994 alkali pump mechanical seal provides alkali pump mechanical seal type, parameters, main dimensions, model species representation, technical requirements, testing and test methods, installation requirements and so on.
JB / T 7371-1994 alkali pump mechanical seal for alkali pump mechanical seal
JB / T 7372-1994 acid pump mechanical seal
JB / T 7372-1994 standard acid pump mechanical seal provides the acid pump mechanical seal with the basic version, the main dimensions, parameters, material, model representation, technical requirements and so on.
JB / T 7372-1994 acid pump mechanical seal for acid pump mechanical seal.
JB / T 1472-1994 pump mechanical seal
JB / T 1472-1994 pump mechanical seal pump mechanical seal provides the basic type, main dimensions, model representation, technical requirements, etc.,
JB / T 1472-1994 pump mechanical seal for rotary mechanical seals and other similar mechanical rotary shaft seal.
JB / T 6614-1993 boiler feed water pump mechanical seal technology
JB / T 6614-1993 boiler feed water pump mechanical truck security seals technology provides for boiler feed water pump mechanical seal of the main types, that is, requirements, testing and test methods, inspection rules and other requirements.
JB / T 6614-1993 boiler feed water pump mechanical seal technology for boiler water temperature no higher than 260 ° C the boiler feed pump seals supporting the use of heavy machinery
JB / T 5966-1995 submersible pump mechanical seal
JB / T 5966-1995 submersible pump mechanical seal provides submersible pump mechanical seal type, parameters and main dimensions, model representation, technical requirements, test methods and inspection rules, installation and use requirements and so on.
JB / T 5966-1995 submersible pump mechanical seal for submersible pumps with mechanical seals.
HG / T 2478-1993 lined pump mechanical seal technology
HG / T 4114-2009 pulp pump mechanical seal technology provides a glass-lined pump mechanical seal design, manufacture, use, testing, marking and installation requirements.
HG / T 4114-2009 pulp pump mechanical luggage seals technology for seal chamber pressure 0 ~ 0.3MPa, Operating Temperature 0 ~ 70 ° C, the shaft speed is less than 3000r/min, 30 ~ 80mm shaft diameter of the bore glass pump mechanical seal (hereinafter referred to as mechanical seal)
HG / T 2100-2003 chlorine liquid ring pump mechanical seal
HG / T 2100-2003 chlorine liquid ring pump mechanical seal provides chlorine liquid ring pump mechanical seal structure type, technical requirements, testing, installation and use.
2013年10月24日星期四
Slag pump mechanical seal
Slag pump is a gear pump , the mechanical seal device and discuss problems , also called seal mechanical seal , he is relying on springs and seals in the pressure of the media twisted the ring and stationary outer ring contact pressing force occurred on the right , is that the two end faces tight fit. Face a very thin oil film between the stick ,high security seal when the media after great resistance to prevent liquid leak , in order to reach the goal sealed , while the ring and stationary ring has a smooth probation . Adapt well to complete no leak .
Mechanical seal features: slag disposal pump mechanical seal problems and discussion of the mechanical seal primary strengths are sealed securely in an application cycle, leaked rarely ; probation long life, you can usually use five years ; maintenance cycle. But the mechanical seal structure is complicated, built-in , repairing mechanical seal pump should stop crashes often heavy workload . Thus , to ensure reliable mechanical seal work , delay the use and life of the mechanical seal is very important.
Mechanical seals in their daily operations , prone to many problems. Mechanical seals to attack the primary problem is the amount of leaked tolerance and temperature is too high, touch the mechanical seal gland, If you can not stay on top , to clarify the temperature is too high. Leaked amount should not exceed 60 drops each side / min.wire seals If a linear flow , then clarified excessive leak can be sure they can look operation ; if outward injection , you should immediately check the downtime
Mechanical seal features: slag disposal pump mechanical seal problems and discussion of the mechanical seal primary strengths are sealed securely in an application cycle, leaked rarely ; probation long life, you can usually use five years ; maintenance cycle. But the mechanical seal structure is complicated, built-in , repairing mechanical seal pump should stop crashes often heavy workload . Thus , to ensure reliable mechanical seal work , delay the use and life of the mechanical seal is very important.
Mechanical seals in their daily operations , prone to many problems. Mechanical seals to attack the primary problem is the amount of leaked tolerance and temperature is too high, touch the mechanical seal gland, If you can not stay on top , to clarify the temperature is too high. Leaked amount should not exceed 60 drops each side / min.wire seals If a linear flow , then clarified excessive leak can be sure they can look operation ; if outward injection , you should immediately check the downtime
2013年10月8日星期二
Reactor with a mechanical seal principle introduced
Mechanical seal is by one pair or several pairs perpendicular to the axis relative to the sliding face in the fluid pressure and compensation institutions elastic ( or magnetic ) to keep under seal affixed to achieve the merger with auxiliary shaft seal leakage resistance device .
Common mechanical seal structure consists of stationary ring ( stationary ring ) 1, the rotating ring ( ring ) 2, the elastic element 3, the spring seat four , set screws 5 , 6 secondary seal rotating ring and the stationary ring seal 8 and other auxiliary components , anti-rotation pin 7 is fixed to prevent the gland 9 stationary ring is rotated . Rotating ring and the stationary ring often also according to whether they have the ability to compensate for axial cyclic or compensation is also referred to as compensation .
Mechanical seal possible leakage of fluid channels are A, B, C, D four channels.
C, D leakage channels are stationary ring and the gland , the gland seal between the housing , the two are static seal .ss cable ties B channel between the rotary shaft sealing ring and , when Friction and wear , it can follow the compensation ring only for a small amount of movement in the axial direction , in fact, still a relatively static seal .
Therefore, these leak paths are relatively easy closure. The most commonly used static sealing rubber O-ring or PTFE V-ring , and as compensation or stationary rotating ring ring ring secondary seal , sometimes using both elastic elements feature rubber, PTFE or metal bellows structures.
A channel is a rotating ring and the stationary ring opposite end faces sliding Lamination dynamic seal , it is the mechanical seal device of the main seal , mechanical seal in determining the performance and life of the key. Thus , the processing requirements of the seal face is high , while the sealing end faces in order to maintain the necessary lubrication film , the system must be strictly the end surface of the cavity pressure per unit area , the pressure is too large, difficult to form a stable lubricating film , will accelerate the end wear ; pressure is too small , increase of leakage . Therefore, to obtain good sealing performance and enough life , in the design and installation of mechanical seals , we must ensure that the pressure per unit area of face value in the most appropriate range.
Mechanical seal with relatively soft packing seal , has the following advantages:
① reliable sealing in a long period of operation, the sealed state is very stable, very small leakage , wire seals according to rough statistics, the leakage is typically only soft packing seal 1/100 ;
② long life in oil, aqueous medium, generally up to 1 to 2 years or more, usually in the chemical medium can be more than six months ;
③ friction small power consumption of the mechanical seal is only soft packing seal friction power of 10% to 50%.
Common mechanical seal structure consists of stationary ring ( stationary ring ) 1, the rotating ring ( ring ) 2, the elastic element 3, the spring seat four , set screws 5 , 6 secondary seal rotating ring and the stationary ring seal 8 and other auxiliary components , anti-rotation pin 7 is fixed to prevent the gland 9 stationary ring is rotated . Rotating ring and the stationary ring often also according to whether they have the ability to compensate for axial cyclic or compensation is also referred to as compensation .
Mechanical seal possible leakage of fluid channels are A, B, C, D four channels.
C, D leakage channels are stationary ring and the gland , the gland seal between the housing , the two are static seal .ss cable ties B channel between the rotary shaft sealing ring and , when Friction and wear , it can follow the compensation ring only for a small amount of movement in the axial direction , in fact, still a relatively static seal .
Therefore, these leak paths are relatively easy closure. The most commonly used static sealing rubber O-ring or PTFE V-ring , and as compensation or stationary rotating ring ring ring secondary seal , sometimes using both elastic elements feature rubber, PTFE or metal bellows structures.
A channel is a rotating ring and the stationary ring opposite end faces sliding Lamination dynamic seal , it is the mechanical seal device of the main seal , mechanical seal in determining the performance and life of the key. Thus , the processing requirements of the seal face is high , while the sealing end faces in order to maintain the necessary lubrication film , the system must be strictly the end surface of the cavity pressure per unit area , the pressure is too large, difficult to form a stable lubricating film , will accelerate the end wear ; pressure is too small , increase of leakage . Therefore, to obtain good sealing performance and enough life , in the design and installation of mechanical seals , we must ensure that the pressure per unit area of face value in the most appropriate range.
Mechanical seal with relatively soft packing seal , has the following advantages:
① reliable sealing in a long period of operation, the sealed state is very stable, very small leakage , wire seals according to rough statistics, the leakage is typically only soft packing seal 1/100 ;
② long life in oil, aqueous medium, generally up to 1 to 2 years or more, usually in the chemical medium can be more than six months ;
③ friction small power consumption of the mechanical seal is only soft packing seal friction power of 10% to 50%.
2013年9月24日星期二
Fully sealed structure and heat transfer technology
HF radar in the marine environment, conditions, vulnerable to salt spray corrosion , in order to meet the reliability , environmental compatibility , electromagnetic compatibility and other military standard requirements, according to the Navy for many years engaged in product design experience , in addition to the circuit board components in strict accordance with the three anti- design, all parts corrosion-resistant materials and surface corrosion treatment outside the main chassis and the radar transmitter enclosure with fully luggage seals sealed structure to achieve environmental adaptability requirements of each circuit boards and modules between the use of isolation and shielding design to prevent electromagnetic leakage and interference , to ensure electromagnetic compatibility requirements in order to improve product quality and reliability.
Radar hosts and transmitters with full sealing mechanism , the electronic components and power supply has sealed all the heat inside the chassis , in order to ensure long-term work , using a fully sealed structure and heat transfer technology . The main core techniques are as follows : 1. Reed heat conduction technology special design on the chassis of the thermal conductor , to ensure the direct heat conduction. Thermal conductivity of the circuit module rail mounting , as well as ensure that the entire thermal conductivity is not over-temperature , thermal conductivity is fixed between the left and right rails , the thermal control of heat transfer to the rail and then spread to the heat sink can be through a dedicated duct heat away , the use of reed -type heat transfer technology, using high thermal conductivity of the material , made of highly wear-resistant elastic reed , fixed on the rail , while using the self- locking device , making the skills to achieve locking , can slide smoothly on the rail . 2 Sealed balanced cooling technology radar transmitters and radar host chassis is completely sealed by the internal fan and return air duct to the various hot spots scattered in the heat balance inside a pull tite seals sealed chamber , and then rely on thermal radiation and convection the heat conduction in the entire housing , the housing of the chassis has a heat sink and convection heat axial fan speed , so as to achieve the purpose of external cooling equipment housing .
Radar hosts and transmitters with full sealing mechanism , the electronic components and power supply has sealed all the heat inside the chassis , in order to ensure long-term work , using a fully sealed structure and heat transfer technology . The main core techniques are as follows : 1. Reed heat conduction technology special design on the chassis of the thermal conductor , to ensure the direct heat conduction. Thermal conductivity of the circuit module rail mounting , as well as ensure that the entire thermal conductivity is not over-temperature , thermal conductivity is fixed between the left and right rails , the thermal control of heat transfer to the rail and then spread to the heat sink can be through a dedicated duct heat away , the use of reed -type heat transfer technology, using high thermal conductivity of the material , made of highly wear-resistant elastic reed , fixed on the rail , while using the self- locking device , making the skills to achieve locking , can slide smoothly on the rail . 2 Sealed balanced cooling technology radar transmitters and radar host chassis is completely sealed by the internal fan and return air duct to the various hot spots scattered in the heat balance inside a pull tite seals sealed chamber , and then rely on thermal radiation and convection the heat conduction in the entire housing , the housing of the chassis has a heat sink and convection heat axial fan speed , so as to achieve the purpose of external cooling equipment housing .
2013年9月13日星期五
Pump seal failure of the power dynamic seal and screw sealing
Vice impeller plus parking seal pumps in operation , the pressure generated by the impeller , deputy head of the main impeller exit equilibrium pressure liquid to achieve seal. Parking , vice impeller does not work, it is required to solve the parking with parking seal leaks that may arise .
Vice impeller sealing structure is simple , reliable sealing , long life operation can achieve watertight , so the transport medium containing impurities often used on the pump . Vice impeller good sealing effect is conditional, ie, the working pressure must not exceed the allowable working pressure . Once exceeded, will have a serious leak. Working pressure change is mainly due to the pump suction pressure changes , seal strap so the use of auxiliary impeller seal pump inlet pressure of the pump must make strict rules , otherwise the seal will fail . Since the form of sealed parking lot , after the failure can easily find that this will not repeat .
Spiral Seal
Spiral seal is a dynamic seal form, it is the rotating shaft or sleeve accommodating the shaft of the helical groove machining , between the shaft and the sleeve filled with a sealing medium . The rotation axis of the spiral grooves pump delivery resulted in a similar effect , thereby preventing leakage of the sealing liquid . The size of the sealing ability of the spiral angle , pitch, tooth width , tooth height , the role of the tooth length of the gap between the shaft and sleeve size. Since the friction between the seals does not occur , and therefore long life, but because of structural limitations of space , the screw length is generally short ,metal seal and thus the sealing capacity has been limited . Slow down and use the pump when the sealing effect is greatly reduced.
Vice impeller sealing structure is simple , reliable sealing , long life operation can achieve watertight , so the transport medium containing impurities often used on the pump . Vice impeller good sealing effect is conditional, ie, the working pressure must not exceed the allowable working pressure . Once exceeded, will have a serious leak. Working pressure change is mainly due to the pump suction pressure changes , seal strap so the use of auxiliary impeller seal pump inlet pressure of the pump must make strict rules , otherwise the seal will fail . Since the form of sealed parking lot , after the failure can easily find that this will not repeat .
Spiral Seal
Spiral seal is a dynamic seal form, it is the rotating shaft or sleeve accommodating the shaft of the helical groove machining , between the shaft and the sleeve filled with a sealing medium . The rotation axis of the spiral grooves pump delivery resulted in a similar effect , thereby preventing leakage of the sealing liquid . The size of the sealing ability of the spiral angle , pitch, tooth width , tooth height , the role of the tooth length of the gap between the shaft and sleeve size. Since the friction between the seals does not occur , and therefore long life, but because of structural limitations of space , the screw length is generally short ,metal seal and thus the sealing capacity has been limited . Slow down and use the pump when the sealing effect is greatly reduced.
2013年8月23日星期五
Resolution valve leakage and valve sealing performance factors
Assessment of the valve is the valve sealing performance merits of the main indicators of quality. Valve sealing performance mainly include two aspects, namely, leakage and leakage.
Endoleak refers to the closure member between the valve seat and sealing of the media reach, assessment criteria within the country there are two missing. One is the State Technical Supervision Bureau released in December 2008, July 1, 2009 began implementation of national standards GB/T13927-2008 "industrial valve pressure test." This standard is used with reference to the international standard ISO5208-2007 "Industrial valves valve pressure test" develop and the other is issued by the Ministry of Machinery Industry JB/T9092-1999 "valve testing and inspection," This standard is referenced to meet API598- 1986 "valve inspection and test" developed. GB/T13927-2008 for general industrial valves inspection; JB/T9092-1999 industrial valves for the oil inspection.
Leakage refers to the parts of the stem packing leak, the leak in the flange gasket and valve parts casting defects caused due to leakage, leakage is simply not allowed. If the media is not allowed into the atmosphere, then the leakage of indicative seals leakage than the inner seal more important. Therefore, the valve sealing performance should lead to the manufacturer's attention.
⑴ quality sealing surface of the valve sealing performance of the sealing surface of the valve seat and the closure member is in contact with each other to shut down part. When the sealing surface pressure at 40MPa or less, the quality of the sealing surface of the valve sealing performance play a decisive role. This is because: When the sealing surface pressure is small, low surface roughness, the leakage is increasing rapidly. When the sealing surface pressure is large, the surface roughness on the leakage has been significantly reduced.
⑵ width on the valve sealing surface of the sealing performance of the sealing surface width determines the length of the pores. When the width is increased, fluid movement along the pores stroke lengthened to increase the resistance movement. Can be reduced to increase the width of the sealing surface pressure in the valve erosive wear. Increase the width of the bolt seals sealing surface, it will cause leakage increased in proportion to the stroke length, and thus be able to proportionately reduce leakage. But the sealing surface width increases, in the same sealing force, the sealing pressure than decreases, but also make the possibility of leakage increases. Therefore, the increase can not be unlimited sealing surface width.
Endoleak refers to the closure member between the valve seat and sealing of the media reach, assessment criteria within the country there are two missing. One is the State Technical Supervision Bureau released in December 2008, July 1, 2009 began implementation of national standards GB/T13927-2008 "industrial valve pressure test." This standard is used with reference to the international standard ISO5208-2007 "Industrial valves valve pressure test" develop and the other is issued by the Ministry of Machinery Industry JB/T9092-1999 "valve testing and inspection," This standard is referenced to meet API598- 1986 "valve inspection and test" developed. GB/T13927-2008 for general industrial valves inspection; JB/T9092-1999 industrial valves for the oil inspection.
Leakage refers to the parts of the stem packing leak, the leak in the flange gasket and valve parts casting defects caused due to leakage, leakage is simply not allowed. If the media is not allowed into the atmosphere, then the leakage of indicative seals leakage than the inner seal more important. Therefore, the valve sealing performance should lead to the manufacturer's attention.
⑴ quality sealing surface of the valve sealing performance of the sealing surface of the valve seat and the closure member is in contact with each other to shut down part. When the sealing surface pressure at 40MPa or less, the quality of the sealing surface of the valve sealing performance play a decisive role. This is because: When the sealing surface pressure is small, low surface roughness, the leakage is increasing rapidly. When the sealing surface pressure is large, the surface roughness on the leakage has been significantly reduced.
⑵ width on the valve sealing surface of the sealing performance of the sealing surface width determines the length of the pores. When the width is increased, fluid movement along the pores stroke lengthened to increase the resistance movement. Can be reduced to increase the width of the sealing surface pressure in the valve erosive wear. Increase the width of the bolt seals sealing surface, it will cause leakage increased in proportion to the stroke length, and thus be able to proportionately reduce leakage. But the sealing surface width increases, in the same sealing force, the sealing pressure than decreases, but also make the possibility of leakage increases. Therefore, the increase can not be unlimited sealing surface width.
2013年8月15日星期四
Seals technology innovation and development
Rubber seals are an important foundation element mechanical products, the manufacturing of high precision, as China's automobile manufacturing and the rapid growth of car ownership, seal products in the structure or materials are required on both high-precision technology and equipment support. In recent years, specializing in the production of seals in the part of enterprises to adapt to market positioning, timely adjustment of industrial structure and product mix, the rapid development and growth. Rapid increase in production output at the same time, in the production and testing equipment, experiments have also done a great investment.
◆ rubber seal material developments
Nitrile rubber seals used, hydrogenated nitrile, fluorine rubber, acrylic rubber, PTFE and other special rubber material formulation and processing technology research, improve material performance and utilization is still applicable to the focus. Applications of nanomaterials will enhance the mechanical properties of rubber material and special features. April 1 this year, the National Standardization Commission issued the first batch of four execution of nanomaterials GB, there is a rubber "ZnO" standard.
Special engineering elastomers replace low performance oil and rubber; bright surface of the rubber surface treatment; through nanotechnology rubber material modification and application of liquid rubber material, in recent years have made some progress. Especially some recent application of new materials for rubber cable sealing technology has played a great role in promoting.
The application of the padlock seals is relatively weak thermoplastic elastomer (TPE) having a vulcanized rubber physical properties and processability of the thermoplastic resin technology, molding process does not require vulcanization, which is the third generation of rubber. The main varieties of TPO, TPV, TPU has been widely used in the world: TPV applications in the automotive average annual growth of 15%, is generally EPDN and PP full crosslinking compound, which combines the high tensile strength, oil heat, etc. performance, long resistant to 150 ℃ hot oil working conditions, can be used to replace the production of automotive EPDM seals and other products; TPO is currently using more EPDM with polyethylene component composition, production process is mechanical mixing and dynamic vulcanization. Dynamic vulcanization production of the TPO. Rubber component is as high as 60 to 70%, abrasion resistance, ozone resistance, high tear strength, compression deformation is small, the overall performance is better than EPDM vulcanized rubber.
United States, Western Europe and Asia continue to build TPO production unit; TPU plastic and has excellent processing properties and physical properties of rubber, and its wear resistance, low temperature resistance, excellent radiation performance in the automotive, aerospace, medical and health , household items, military supplies and other industrial applications have great progress, TPU can be widely used in automotive shock absorber, bushings, bearings, bushings, airbags and other components.
◆ rubber seal material developments
Nitrile rubber seals used, hydrogenated nitrile, fluorine rubber, acrylic rubber, PTFE and other special rubber material formulation and processing technology research, improve material performance and utilization is still applicable to the focus. Applications of nanomaterials will enhance the mechanical properties of rubber material and special features. April 1 this year, the National Standardization Commission issued the first batch of four execution of nanomaterials GB, there is a rubber "ZnO" standard.
Special engineering elastomers replace low performance oil and rubber; bright surface of the rubber surface treatment; through nanotechnology rubber material modification and application of liquid rubber material, in recent years have made some progress. Especially some recent application of new materials for rubber cable sealing technology has played a great role in promoting.
The application of the padlock seals is relatively weak thermoplastic elastomer (TPE) having a vulcanized rubber physical properties and processability of the thermoplastic resin technology, molding process does not require vulcanization, which is the third generation of rubber. The main varieties of TPO, TPV, TPU has been widely used in the world: TPV applications in the automotive average annual growth of 15%, is generally EPDN and PP full crosslinking compound, which combines the high tensile strength, oil heat, etc. performance, long resistant to 150 ℃ hot oil working conditions, can be used to replace the production of automotive EPDM seals and other products; TPO is currently using more EPDM with polyethylene component composition, production process is mechanical mixing and dynamic vulcanization. Dynamic vulcanization production of the TPO. Rubber component is as high as 60 to 70%, abrasion resistance, ozone resistance, high tear strength, compression deformation is small, the overall performance is better than EPDM vulcanized rubber.
United States, Western Europe and Asia continue to build TPO production unit; TPU plastic and has excellent processing properties and physical properties of rubber, and its wear resistance, low temperature resistance, excellent radiation performance in the automotive, aerospace, medical and health , household items, military supplies and other industrial applications have great progress, TPU can be widely used in automotive shock absorber, bushings, bearings, bushings, airbags and other components.
2013年8月13日星期二
Hydraulic seal installation and removal
Installation and removal of the ceramic factory used hydraulic seals, in order to prevent the hydraulic plastic strap seal is threaded, undercut such an acute angle to scratch the sealing performance, we must adopt the following measures:
A) shall cylinder, piston, piston rod and the guide sleeve ends and other uses 15 ~ 30 ° angle smooth introduction.
2) When the hydraulic seals must pass male or retraction bad, they should put in their respective positions on the special sleeve, you can also make the outer diameter of the external thread or undercut the hydraulic diameter less than the inner diameter of the seal.
3) When the hydraulic seal to the internal thread or radial through holes, should the inner diameter or radial threaded hole is larger than the diameter of the outer diameter of hydraulic seals.
4) To reduce the hydraulic meter seals installation and removal of resistance, hydraulic seals should be subject to the appropriate location on the coated lithium soap grease or hydraulic working oil, hydraulic seals and try to avoid excessive stretching, in order to avoid the plastic deformation affecting the hydraulic seal of the sealing performance.
A) shall cylinder, piston, piston rod and the guide sleeve ends and other uses 15 ~ 30 ° angle smooth introduction.
2) When the hydraulic seals must pass male or retraction bad, they should put in their respective positions on the special sleeve, you can also make the outer diameter of the external thread or undercut the hydraulic diameter less than the inner diameter of the seal.
3) When the hydraulic seal to the internal thread or radial through holes, should the inner diameter or radial threaded hole is larger than the diameter of the outer diameter of hydraulic seals.
4) To reduce the hydraulic meter seals installation and removal of resistance, hydraulic seals should be subject to the appropriate location on the coated lithium soap grease or hydraulic working oil, hydraulic seals and try to avoid excessive stretching, in order to avoid the plastic deformation affecting the hydraulic seal of the sealing performance.
2013年8月4日星期日
Special installation is required gasket
1, the installation and the sudden planar spiral wound gasket sealing flange match, should be taken to ensure the security seals concentric with the pipe, commonly used to strengthen the outer ring and the inner circumferential surface contacts the bolt to locate, not eccentrically mounted. Tongue and groove sealing surface mounting flange of the basic type spiral wound gasket, attention should be consistent with the groove wall to keep the gap.
2, the installation of the metal-coated gasket narrow width, the thickness of the plate should be placed in a lateral pads, and then pressing the flange, the coated metal gasket to prevent compression of the filler, the interfaces of the metal shell (or take the mouth) expansion opened, damaged metal jacketed gaskets.
3, when the flange temperature higher than 200 ℃, the flange and gasket sealing surface should be coated with sealant between to prevent high temperature gasket and flange sealing surface sintering, to increased maintenance and replacement gasket trouble.
4, the sealing surface is not flat, the surface can be coated with the sealing gasket sealant before installation. Sealants generally manganese dioxide, lead, graphite powder and survived after linseed oil (drying) components. According to the cable sealing medium, temperature and pressure conditions choose the appropriate media type and brand of liquid sealant.
5, for the installation octagonal metal ring gasket, when the metal ring gasket and flange seal groove machining is not ideal, it can be achieved by coordination study snug fit. For large diameter metal ring gasket, with research more difficult, in order to fill tiny uneven metal surface, use sealant.
2, the installation of the metal-coated gasket narrow width, the thickness of the plate should be placed in a lateral pads, and then pressing the flange, the coated metal gasket to prevent compression of the filler, the interfaces of the metal shell (or take the mouth) expansion opened, damaged metal jacketed gaskets.
3, when the flange temperature higher than 200 ℃, the flange and gasket sealing surface should be coated with sealant between to prevent high temperature gasket and flange sealing surface sintering, to increased maintenance and replacement gasket trouble.
4, the sealing surface is not flat, the surface can be coated with the sealing gasket sealant before installation. Sealants generally manganese dioxide, lead, graphite powder and survived after linseed oil (drying) components. According to the cable sealing medium, temperature and pressure conditions choose the appropriate media type and brand of liquid sealant.
5, for the installation octagonal metal ring gasket, when the metal ring gasket and flange seal groove machining is not ideal, it can be achieved by coordination study snug fit. For large diameter metal ring gasket, with research more difficult, in order to fill tiny uneven metal surface, use sealant.
2013年7月25日星期四
Seal oil spill countermeasures Mifengbuyan
1, the master and the basics of identifying counterfeit seal, buy high quality, standard security seals.
2, such as shaft and IKO bearings badly worn; seal rubber aging or spring failure, etc., should be timely repair and replacement of the corresponding parts.
3, If there is lip flange, spring off and seal must be removed when skewed to reload. It should be noted: When the shaft seal spring tension is not enough to wear and when not to arbitrarily tighten the inner spring.
4, the application of agricultural machinery on the cable sealing generally poor working conditions, environmental temperature, dust and more frequently so that mechanical machinery vibration changing the situation by force, to ground inspection, maintenance and repair.
5, in the oil seal lip or shaft position corresponding to clean oil or grease paint. Apply sealant seals the outer ring, with the cardboard part of the shaft keyway wrap to avoid scratches lip seal, seal with special tool will rotate inward pressed, do not be hard hit hard punch to prevent deformation of seal or squeeze off the spring and failure;
2013年7月11日星期四
In the oil seal in the role of security
Anomalous velocity investigation. The equipment and technology pipeline, pump transporting raw oil, gasoline, diesel and other media, these media leaks, will pollute the environment. Investigation by the Department to deal with long-term mechanism danger, expand "nutation picking gold" activities, and progress the investigation dangerous employees' enthusiasm, and after inspection team when the wrong employees, managers and technical staff daily inspection, weekly inspection, monthly inspection methods, equipment "run, run, drip, leak," representation for "carpet" investigation. The Ministry together with long-term operation promotion device to an intermediate level of work, expand the "Device long-term operation" special performance of inspection activities, use the "advanced profiling mechanism, dangerous and rapid response mechanisms for investigation mechanism", duties performed, a clear mission, to ensure the investigation various types of abnormal appearance accurate and efficient.indicative seal
Target tight monitoring. Gas emission into the atmosphere with the regeneration of the catalyst dust, sulfur compounds and the like are also important sources. To ensure that countries have agreed to reach emission norms, the Ministry stalking monitoring of the environmental analysis, in order to adjust operational plans. Catalyst regenerator charred rehabilitation activity, simply run with the rising smoke damage, the Ministry charred catalyst role in ensuring the premise, the proper cut into the regenerator main air volume, and the optimal adjustment of the regenerator lower, middle , the upper main air distribution volume, a decrease in the upper main air flow, reduction catalyst run probability. Together with the feedstock oil is rich in sulfur compounds, after reaction, some with the flue gas emissions. The processing unit sets the catalytic hydrogenation device to heat the wax-based, decrease the sulfur content in the feedstock oil; catalytic component device doped added in March, increased sulfur content in the flue gas, the device of sulfur removal agent filling time add the capacity from 200 kg to 300 kg, and successfully decrease the sulfur content in the flue gas.
Field zero emissions. In order to find the scene zero emissions, the completion of the sewage qualified rate reaches 100%, the Department staff will perform the usual concept of clean production work, to standardization, standardized operation to promote clean production, not only the implementation of the equipment enclosed dehydration, also timed to recover the residue sampling port , smooth mist pump oil condensate collection tank and pumps, heat exchangers and other equipment maintenance before, after the withdrawal of special hydrocarbon line, back line pressure relief to the specified oil tank. The Department will also lows each row of condensate oil pipeline technology fitted seals, container vent valve fitted blind, completely eliminate the chaos row misplacing appearance, in the disposal of unusual things, through sewage reporting standards to ensure that the sewage disposal promptly accepted the sewage farm, complete the "clean-up triage."metal seal
Target tight monitoring. Gas emission into the atmosphere with the regeneration of the catalyst dust, sulfur compounds and the like are also important sources. To ensure that countries have agreed to reach emission norms, the Ministry stalking monitoring of the environmental analysis, in order to adjust operational plans. Catalyst regenerator charred rehabilitation activity, simply run with the rising smoke damage, the Ministry charred catalyst role in ensuring the premise, the proper cut into the regenerator main air volume, and the optimal adjustment of the regenerator lower, middle , the upper main air distribution volume, a decrease in the upper main air flow, reduction catalyst run probability. Together with the feedstock oil is rich in sulfur compounds, after reaction, some with the flue gas emissions. The processing unit sets the catalytic hydrogenation device to heat the wax-based, decrease the sulfur content in the feedstock oil; catalytic component device doped added in March, increased sulfur content in the flue gas, the device of sulfur removal agent filling time add the capacity from 200 kg to 300 kg, and successfully decrease the sulfur content in the flue gas.
Field zero emissions. In order to find the scene zero emissions, the completion of the sewage qualified rate reaches 100%, the Department staff will perform the usual concept of clean production work, to standardization, standardized operation to promote clean production, not only the implementation of the equipment enclosed dehydration, also timed to recover the residue sampling port , smooth mist pump oil condensate collection tank and pumps, heat exchangers and other equipment maintenance before, after the withdrawal of special hydrocarbon line, back line pressure relief to the specified oil tank. The Department will also lows each row of condensate oil pipeline technology fitted seals, container vent valve fitted blind, completely eliminate the chaos row misplacing appearance, in the disposal of unusual things, through sewage reporting standards to ensure that the sewage disposal promptly accepted the sewage farm, complete the "clean-up triage."metal seal
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