Labyrinth seal tandem dry gas buffer gas system

Tandem with intermediate labyrinth security seals dry gas seals seal buffer gas system
Sealed gas side seal dry gas seal is sealed using a filtered gas nozzle into a flush , as single-acting dry gas seal sealing sealing air system . From the dry gas seal leaking exhaust gas from the nozzle to the torch.
Labyrinth seal mounted in the middle of the torch nozzle to the gas supply pipe and a buffer between the mouth . Outside dry gas seals seals are used to prevent buffer gas leaking into the atmosphere. Using the electrical contact control differential pressure solenoid valve opening degree , to ensure a pressure buffer gas to the torch is always higher than the gas pressure , thus ensuring leak from the intermediate labyrinth seal is sealed with the gas discharge from the nozzle to the torch. If they are dry gas seal gas side seal failure , due to leakage of gas pressure , resulting in a buffer gas pressure increases ,cargo seal the intermediate labyrinth seal fluorine rubber seals to prevent leakage of gas leakage to the atmosphere . Leaking gas emissions to the flare .

Raiders against dust dusty weather sealed body care do

Clean the car mainly "large"
Some people may think to get the trunk of the oil duster sweep on it. In fact, things are not so simple , a little dust on the car 's damage is still very large . Filled the dust after cleaning vehicle owners who first thought is , you need to be reminded that , in addition to cleaning the dust surface of the vehicle , can not be ignored on the car air-conditioning , air filters, water tanks and other parts cleaning.
( 1 ) Clean the air filter
After the dust weather , we should first clean up the car air-conditioning installed in the air inlet filter because as the weather gets warmer, the increasingly frequent use of air conditioning ,barrier seals  if not promptly cleaned , air conditioning will be turned on when the dust along the wind Road into the car, pollute the air inside .
I believe that many owners simply do not know it exists , air filter machine under the hood near the front windshield location is inside the air inlet filter. As long as we noticed the parts , clean , we can guarantee the future when the use of air conditioning , interior air fresh . ( 2 ) clean air filter air filter is designed to filter the air sucked into the engine , to prevent foreign matter sucked into the engine and increase the wear and extend engine life. Dust weather , the dust in the air will be many times more than usual , the car's air filter will be attached to a lot of dust particles affect the engine air intake . So when the dust weather after friends recommended the driver out of the air filter , clear up above the dust , and to dust in the air filter assembly clean , which can greatly extend the life of the air filter , and to reduce fuel consumption also have a role.
( 3 ) clean water tank
Spring wind, catkins and more, after the dust storm , dust, catkins will gather in a large number of vehicles on the condenser and radiator , forming a layer of felt like the same thing , security seal affecting gas flow , so that the cooling effect variation, temperature corresponding vehicle increased. When the summer heat is not good because the condenser , air conditioning does not cool or it will result in failure of the water temperature is too high .
So dust weather , you can not ignore the tank cleaning , we recommend you check the vehicle before using the air conditioning condenser and radiator surface for dirt , debris, and promptly clean to avoid affecting the normal engine cooling and air conditioning systems .

Component polysulfide sealant specific construction methods

1, the sealing surface treatment:
Before construction of the former road after construction debris clean up residual waste , barrier seals reuse blower or vacuum floating ash handle clean , if the base surface moist after application of a blowtorch to dry again with a wire brush to remove after baking fall cement debris and dust. To remove the sticky surface oil, dirt and other debris and plastic attachments ( two-component polysulfide sealant stick plastic and oil, available portable cutting machine , grinding wheel, steel brushes and other tools work ) , clean and with a hair dryer blowing debris so strong adhesive surfaces exposed structural layer , the surface must be guaranteed completely dry joints , clean, no cream. All surface dirt and cement slurry must be cleared brush handle clean . Must be absolutely guaranteed to be sticky surface is dry , flat, in order to prevent adhesion failure . Metal surface rust and paint protection also need to be removed. If the structure quit, available blowtorch drying.
2 , before construction on both sides of the gap 10mm at 50mm wide masking tape affixed to prevent the construction of the structures of excess polysulfide rubber surfaces soiled.
3 , filling Backing Material:
According to the design requirements, the joints filled with backing material , generally designed to require filling polyethylene foam board , this seams on board our factory production, specialized and two-component polysulfide sealant supporting the use of buildings .
4 , brushing primer solution: design requires the use primer solution works , or long-term flooding parts of the vehicle seals , to brushing primer liquid surface was sticky , dry film ( primer reprovision ) .

Labyrinth seal device successfully applied Dryer

In order to better seal the dryer , mechanical R & D personnel to undergo many , many studies , and ultimately a " labyrinth " security seals seal and successfully applied slime dryer, rotary dryer and three drum drying dry fields.
Research found : Dryer labyrinth seal is curved so that the air flow through the channels, generation of fluid resistance, so that air leakage is reduced .
Dryer according to the different labyrinth passage direction , the labyrinth seal into the axial and radial labyrinth seal. Slime dryer labyrinth seal structure is simple , there is no contact surface , so there is no wear problems , it is not traverse of the cylinder .
Considering the inherent cylinder and labyrinth seal manufacturing error , and the cylinder axis of the bending stiffness , the gap between adjacent labyrinth ring is not too small , generally not less than 20-40mm.
The greater the gap , the fewer the number labyrinth sealing effect is worse . Therefore, the labyrinth seal is only applicable where the gas pressure is small , or in combination with other sealing structure . This technological innovation allows Huachang Machinery tasted the sweetness , tamper seal labels but this little seal limitations Huachang Machinery recently came to do a number of initiatives in the hope that other sealing technology breakthrough.

Pump seals and parking sealing power calculation

Currently vice impeller pump seals dynamic seal and parking in metallurgy, mining and petrochemical industries are more common applications, dynamic seals and parking packing seal and mechanical seal can overcome some of the deficiencies , has a simple structure , reliable sealing, point the advantage of liquid does not leak .
Vice impeller dynamic seal :
Vice impeller dynamic seals ( also known as centrifugal sealing , fluid power seals, etc. ) can be divided into sub- blade impeller seal sealing and vice . When the pump rotates , the impeller is generated out of the fluid pressure P , and then to the outlet at the same time pressed against the packing room , the media leak out . However, since the sub- sub impeller blades and the role, it generates a centrifugal force P1 ' or P2'. The direction of the impeller pressure P in the opposite direction .
Therefore, the fluid can leak out of the top back . I.e. the formation of the seal cavity "and pressure seal " or " vacuum seal " , during operation of the pump to achieve leak . Because there are parking sealing device , the pump can be obtained when the parking sealed.
1 , the calculation of sub- blade seal
The plane of the impeller rear cover open for a few radial ribs , which is sub- blades. It is very small and the casing to maintain the gap , the liquid approximate angular velocity of the impeller , rather than the sub blades without angular velocity that is half This makes the role of fluid pressure at the packing chamber is reduced.
Without the secondary blade effect, the rear panel of the liquid pressure distribution ABEF. We know that when the impeller blades which produces vice pressure variation is parabolic . Which produces a pressure change is GKFG area .
Which can be obtained :
KF = EF-EK = {[H-(U22-Ub2) / 8g] - [H-(U22-Ur2) / 8g-(U22-Ub2) / 2g]} (1)
As Vice- vane pump there is a gap between the shell . The angular velocity of the liquid in the gap is smaller than the impeller angular velocity ω, but greater than ω / 2.
Stepanov think this is taken as the angular velocity can be approximated by : ω '= ω (1 + t / s) / 2
The formula : ω'- work wheel rear plate and the pump casing the angular velocity of the liquid in the gap
ω- job rotation angular velocity
S- pump casing and impeller cover the distance deputy leaves
t- sub blades average height
Thus , the filler can be obtained prior to the fluid pressure chamber EK calculation formula is :
HBr = H2-1/285 (n/1000) 2 {D22-DR2 + [(s + t) / s] (DR2-Db2)}
Where : HBr- deputy leaves after decompression pressure head ( m water column )
H2 = H-V32/2g, V3 = KV3 √ 2Gh
V3 is the average velocity of the volute
In the calculations, it can be assumed in advance isobaric plastic cable ties sealed, ready HBr = 0; if HBr vacuum seal is taking a negative value into the formula ( 2 ) , the outer diameter of the blade can be obtained sub- DR. If DR is greater than D2 calculated value, you need to consider vice impeller seal structure.
In the calculation , t can be pre-selected . Generally 0.5 to 1 cm , st is the deputy leaves a gap with the pump casing , and its value to the process to ensure accuracy . The smaller the gap , the greater the balance , but the processing and assembly demanding. This gap is related parts with an accuracy of 4 to 6 , the general admission st = 0.03 ~ 0.3 cm ( small pump take a small value ) . In addition, the DR calculated value is often too large. Correct value should also be tested to determine corrected .
Deputy Vice impeller blades and seals , to be consumed in some extra power ( called additional power ) . The power consumption of the auxiliary impeller mainly the friction loss of the liquid . We consider this power value is not exceeded when used after placement of the sealing ring on the wheel generated due to the power consumption amount of leakage .
In addition, it is consumed in the flow path a different unloading discharge hole and with wear on the clearance value of the power increase constant value. This power proportional to the square of the impeller diameter ,cable seals the average width is proportional to the blade .
In order to achieve the same balancing effect , is often appropriate to increase the outer diameter of reducing the width of the blade . Another additional power but also with boost capacity. When a negative value, gasification decomposition on the high side , Vice impeller diameter is large, the power consumption is large . To minimize power loss , the Deputy pressure value should not be designed too .

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 .

Non-contact gas lubricated mechanical seals use

This article summarizes the mixer contacting gas lubricated mechanical security seals important insights , the proper use of appropriate purposes mixer gas seal for the user to improve the quality of great significance to improve product purity . Discusses the mechanical seal is very important to clarify the distinction between various sealing systems mainly basic fluid lubrication liquid hybrid bearing housing with common shaft axis
Blender does not contact with the gas lubricated mechanical seals ( low speed ) sold in the market , there are already more than 10 years . In the past 10 years, has made ​​a series of experiences . This paper summarizes a number of important insights. When used correctly in the appropriate purposes , the mixer gas seal can help the user to improve quality and increase product purity.
When discussing the mechanical seal , the most important thing is to figure out the differences between various sealing systems . Mechanical seals are three basic types: fluid lubricated mechanical seals, gas lubricated mechanical seals and touch off style or called non-contact gas lubricated mechanical seals.
These types of mechanical meter seal difference is in the fluid -lubricated sliding surface of the seal between the fluids. These seals are usually applied mixed friction purpose mixer. For dry running seals, two sliding surfaces in direct contact with each other . On the other hand , the non-contact gas-lubricated mechanical seals , in the operation of the sliding surface is not in direct contact . There are 1 ~ 5μm wide gap separating the surface , which is why this is often referred to as the seal seals from seal causes. When referred to the gas damping double seals should have this distinction.

Spherical bearing disassembly techniques

Spherical bearing is a spherical bearing outer race out surface , sealing shields on both sides of the bearing self-aligning bearings.
390000 series spherical bearings are commonly used on agricultural machinery in Xinjiang , Fukuda , Zhongyuan combine harvesters , have widely adopted this bearing , a locomotive used on up to 30 disks. 390000 series spherical bearings through eccentric shaft fixing the bearing inner ring and eccentric sleeve socket head cap screws from the clamping action . In the maintenance , many machine hand will not dismantling the bearings , it is necessary to introduce the spherical bearing disassembly 390,000 series of technical points and considerations:
A , demolition
1 first with a hex wrench to loosen the eccentric sleeve bearing locking screw , and then cover with a small iron bar into the sink hole eccentric sleeve , against the direction of rotation axis eccentric to play loose .
(2) Loosen the bearing bolts. Together with the bearing removed from the shaft bearing . Note that the demolition before the shaft end bearing . Should be the other end of shaft bearing bolts loose, coloured cable ties so both ends of the bearing strength and damage each other .
Second, the installation
1 before installing the bearing to the shaft , you must unplug the jacket bearing retainer pin , while the journal surface polished smooth and clean , and in the journal at the oiled rust and lubrication ( to allow the bearing on the shaft slightly rotated ) .
(2) with the bearing and the bearing lubricant topcoat , the bearing into the bearing housing . Then the assembled bearing and housing units along the shaft . Pushed to the desired location for installation.
3 mounted eccentric . Condom at first eccentric eccentric sleeve bearing on the steps and along the axis of rotation by hand tightening . Then insert a small iron bar or withstand eccentric sleeve sink hole hand hammer percussion along the axis of rotation of small bars of iron. makes eccentric securely installed , and finally the eccentric sleeve locking hex screws .
4 Fixed bearing bolts do not tighten , plastic seals let bearing jacket can rotate within the bearing . Also installed the other end of the shaft with a bearing and seat , rotate the shaft several turns to the bearing itself automatically find the positive position . Then bearing bolt is good.

High speed mechanical seal

When the speed exceeds 3000r/min or friction than the linear velocity of 25m / s , generally can be regarded as high fixed length plastic strap seal. At high speed , the friction face the linear velocity is large, the heat generated by friction is also more difficult to form film end time , wear and tear .
Speed ​​is also likely to cause vibration of the rotating ring , and by a large centrifugal force , the liquid film between the end faces is not conducive to the formation and maintenance . Therefore, at high speed , to reduce the centrifugal force and vibration, the rotary member should be minimized , spring static structure. You can also enhance the friction face of the cooling and lubrication. It may also be used [PV] the value of high friction material , reducing the width of the contact face , or using a controlled membrane mechanical seal.
In recent years, called the differential ring of the mechanical padlock seals also been applied to high-speed devices . Since the middle of the original movement joined a differential ring ring friction line speed can be reduced by half , and achieved good results.

Pump Mechanical Seal Overhaul Mistakes

1 greater the amount of spring compression seal better. In actual fact , the spring compression excessive friction can cause rapid wear , instantly burning ; excessive compression of the spring to lose the ability to adjust the ring face , resulting in seal failure.
2 ring seal Fig tight as possible . In fact, ring seals tight harm than good. First exacerbate inter- ring and sleeve wear, premature leakage ; Second, increasing the axial adjustment ring , the resistance movement , frequent changes in operating conditions can not make timely adjustments ; Third spring fatigue easily damaged ; four is to make the ring seal deformation, affecting the sealing effect.
3 stationary ring seal tight as possible . Stationary ring seals basically at a standstill , the effect will be relatively tight seal better, but too tight is harmful. One cause static ring seals due to excessive deformation, affecting the sealing effect ; Second, the majority of graphite stationary ring material , generally more brittle , excessive force can easily cause fragmentation ; three is to install , difficult to remove , easy to damage the stationary ring .
4 Impeller lock nut tight as possible . Mechanical seal leakage , the leakage between the sleeve and the shaft ( shaft between the leak ) is relatively common . Generally, the impeller shaft between the leak is not locking the lock master , in fact, lead to leakage between axes many factors , such as the failure of inter-axis pad , offset , there are impurities between axes , with the shaft and sleeve at a larger shape bit error , the contact surface damage , there is a gap between the shaft parts , threaded shaft is too long , and this will lead to leakage between the shafts . Lock nut locking pad between axes can only lead to excessive premature failure , contrary moderate lock locked mother , so that the shaft between the pads always maintain a certain degree of compression flexibility in operation will be automatically timely lock nut locking , so that the shaft is always in a good inter- the sealed state .
5 The new better than the old . In contrast, using the new mechanical seal better than the old , but the new mechanical security stickers quality or choice of material is not the time , with the larger size of the error will affect the sealing effect ; and permeability in the polymerization medium, the stationary ring without excessive wear, or not to replace as well. Because static ring stationary ring seat for a long time in a quiescent state , the polymer and impurities deposited as a whole, played a good seal.
6 overhaul better than not split . Once the mechanical seal leakage will be eager to overhaul , in fact , sometimes sealed and not damaged , simply adjust the working conditions or thecontainer seal can be adjusted to eliminate leakage. This way to avoid waste and to verify their ability to judge the fault has accumulated experience in maintenance to improve the quality of maintenance .

Hollow doors to see how to identify seal glance

REVIEW: essence of the problem is that businesses will not necessarily use the same door pocket and door material , solid wood doors with solid wood Door does not mean that it will . If you do a solid wood door with MDF Door , because it does not contain wood fibers , water prone to foaming , can cause deformation of the door frame , so the best time of purchase ask whether the merchant Door and door of a material .
The selection is not solid wooden door , they usually go hand knocking method determines whether solid , but there are not many doors you knock on whether solid, filled with stuffing inside ,adjustable length plastic seals knocked up with solid doors no difference, but also some owners use to experiment with ways to move the weight , in fact, try not to come out the same effect , because there are a lot of manufacturers put on weight like wood filler to fill in the door , do not come out the same identification .
First, the color of the porter whether their home matches , and then tap , weigh judge the quality of the door . Filler door is generally divided into solid and partially solid, solid filler is certainly heavy , the price also expensive, and some solid relatively light , relatively cheap . However, the market also has some sinister business of some scraps as filler to increase the weight , be careful when consumers buy .
Secondly , you can consult the tightness of the door staff . That is, we say, " seal " , it's in the door pocket and door contact part , feels relatively soft . Formal enterprises will add cable tie wraps, thus avoiding the seam after closing there is always a problem .
Again , that is asking Door material, because most doors if there are problems , mainly Door out of the question. Essence of the problem is that the businesses will not necessarily use the same door pocket and door material , solid wood doors with solid wood Door does not mean that it will . If you do a solid wood door with MDF Door , because it does not contain wood fibers , water prone to foaming , can cause deformation of the door frame , so the best time of purchase ask whether the merchant Door and door of a material .

Ring and stationary ring face grinding

1 ) Remove the snap ring , after grinding, rough first study , after lapping , conditions can be polished .
2 ) coarse grinding , the choice of 80 ~ 160 # grit abrasive , first rubbed machining marks . These can then be abrasive grinding 160 # , so finish to meet the design requirements. Carbide or ceramic ring is required after grinding machine polishing with a polishing . The intensity of polishing machine can be used M28 ~ M5 boron carbide . Polished to a mirror . Ceramic ring available after the M5 agate powder grinding ,plastic truck seals polishing with chromium oxide .
3 ) graphite-filled PTFE stationary ring , because the soft material , can be used kerosene, gasoline or water lapping , without adding abrasives. In the running-in process can also self-development , so finish requirements are not too high .
4 ) milling method, and a grinding machine can grind the grinding machine , grinding machine can not on the use of glass -eight manual polishing method .

Sleeve check
1 ) Remove the rear hub overhaul inspection corrosion and wear , and if rust or wear out relatively minor , can be used fine sandpaper and then , if severe corrosion or worn plating method can be processed or replacement bushings .

Seals
1 ) the use of time after a ring , the majority of cases, loss of elasticity or aging , in general, need to replace the ring .

Spring
A ) If the spring rust is not serious, to preserve the flexibility, time to replace it. If corrosion is more serious or elastic reduced a lot, you will need to be replaced with new springs.
2 ) of a mechanical bolt security seals cartridge assembly , to clean cartridge and check for wear or deformation of the groove , so that correction repaired, re- slotted or replaced.
3 ) After mechanical seals repair , re- assembly, the assembly after the same pressure test , and then put into normal operation.

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.

T -ring to help God nine Flying

When God nine perfect docking with Temple the moment , Shanghai Academy of Spaceflight Technology 805 reports cheering sound into a hall as a docking mechanism for research and development unit , every face was beaming with pride smile. 33 -year-old Geng Haifeng , deputy director of the docking mechanism is the designer , he told reporters about God nine docking with Temple was " seamless" secret --- seals.
"When Shenzhou nine successful docking with Temple One , luggage seals the channel is opened, the two connecting body will form a large airlock order to ensure the safety of the astronauts in the cabin , the entire capsule tightness is essential. How guarantee complete sealing ring is one of the key points . " Geng Haifeng said.
Ring was placed in the Shenzhou nine active docking groove in the surface structure of the butt . Common with people living in different O-ring , God seals on nine docking mechanism was T-type, was stuck in a groove , no force in the case of space , does not automatically fall off.
Before docking with Temple One , God of nine docking mechanism mounted on the seal on the " bare ." In the harsh environment of space , seals to withstand 100 degrees Celsius to minus 75 degrees Celsius high temperature test , but also to withstand a variety of space radiation ,security stickers  which for the production of seals general materials, " Silastic " , it is almost impossible, because silicone rubber in a low temperature environment of " embrittlement " feature.
In order to study the special anti- brittle ring material , Geng Haifeng led the research team from the beginning of 2002 , before and after a six-year science and technology research . 2008 After the successful development of a single product , but also the whole together with a variety of validation tests and overcome countless difficulties

Detailed knowledge of the mechanical seal corrosion protection

The mechanical seal special structural form and the working environment and conditions, corrosion damage morphology are also diverse . PTFE seals, PTFE gasket seals and other mechanical damage to the main form of common corrosion damage , thermal damage and mechanical damage. Where corrosion damage greater harm .
A metal ring corrosion
1 , uniform surface corrosion. If the metal ring surface contact with corrosive media , and the metal itself impatience corrosion , it will produce surface corrosion , and its phenomena are leaks, early wear and tear , damage, sound and so on. Uniform corrosion of metal surfaces and non- film forming two forms , free film very dangerous metal corrosion , stress corrosion cracking is called , the choice of surfacing alloy and cast iron , tungsten carbide, titanium carbide seal ring , prone to stress corrosion rupture. Etching process with a constant speed , so that galvanic corrosion intensified.
2 , stress corrosion cracking. Metal corrosion and tensile stress at the same time under the effect of wear resistance. Corrosion fill F4 ring filled mainly refers selective etching , stripping damage or deterioration . If the hydrofluoric acid , the glass fiber molecule hot corrosion , these cracks communicate the seal faces , accelerated wear of the end face , an increase of leakage .
Two non-metallic corrosion ring
1 , graphite ring corrosion. Enterprise Information Network mentioned impregnated with resin impervious graphite ring , its corrosion for three reasons: First, when the face overheating when the temperature is higher than 180oC , to break away from the resin impregnated graphite ring , the ring wear down ; Second, if the resin impregnated inappropriate choice , so cable security seals cooling system establishment , which is mainly caused by the mistakes selection . The corrosion film , the passivation film characteristics generally has a protective effect , but the metal material used for the sealing ring , such as stainless steel , cobalt -chromium alloy such as a passivation film on the surface friction of the end face destruction , under hypoxic conditions New film is difficult to generate , select corrosion resistant impregnating resin , the use of high pressure impregnation , impregnation depth increase is necessary .
2 , the oxidation of the graphite ring . In an oxidizing medium, the end face or poor cooling in the dry friction generated when a temperature of 350 ~ 40o ℃ graphite ring can react with oxygen to produce CO, gas , can face becomes rough, or even rupture. Metallic ring , while chemical medium and under stress , will rupture.
3 , polytetrafluoroethylene ( PTFE gasket ) corrosion of the sealing ring . Will undergo chemical changes in the medium , but also the wear resistance decreased ; third resin impregnated deep enough, when rubbed impregnation layer , abrasion resistance decreases. F4 filler such as glass fiber , the first crack in the weakened area , and then to develop in depth , to rupture , crack trailer seals sealing ring generally radially diverging type, can be one or more . Graphite , metal powder to improve its heat resistance , wear resistance. Corrosion fill F4 ring filled mainly refers selective etching , stripping damage or deterioration . Such as hydrofluoric acid , hot corrosion of glass fiber molecules , so what things should be filled , as the case may be.

Can I use car lights Mifengbuyan warm baked

A: This time is often heavy rain phenomenon , it finished the rain , my car 's headlights is a fine mist of water inside ; think of the car when a mist , use baking way to remove warm air ,truck seal I do not know whether it also applies to headlights do ?
Q: As lights Mifengbuyan in cleaning and when it rains is likely to cause the water , and when large temperature difference between inside and outside , when it will form a mist. This time is best not to carry high temperature baking, headlight plastic materials are generally qualitative , if the baking temperature is too high , it may cause the headlights look in softening deformation , affecting the use and appearance. In addition , the lights are generally monolithic , transparent lamp , the lamp will stick with a protective body back , between the two will result in high-temperature baking gum melt adhesive , increasing the vehicle lights the possibility of water . In general, the moisture inside the headlights in the daytime sunlight can quickly evaporate . If your headlights frequent water phenomenon,security seal labels it should go to the service station to check the lamp body , to see is not due to damage caused by the collision lights , resulting in frequent water.

Car sealing strip composition and application

There is a very important car body sealing member is made ​​of a synthetic rubber seal, also known as protective molding gibs . Mainly used in door frames, side windows , front and rear windshield , hood and trunk lid , make the seal , the other also played vibration protection.
Production of sealing material is mainly polyvinyl chloride (PVC), ethylene propylene rubber (EPDM), synthetic rubber-modified polypropylene (PP-EPDM) , etc., by extrusion molding or injection molding method is made.
Compartment door seal mainly refers to the door frame and the door seal head and said seal. Door seal by definition is mounted on the door frame seal. Door seal not only to ensure tightness , but also bear the impact force when closed , hence it must be flexible , but also toughness , mainly by the dense gel matrix and sponge rubber foam tube composed of two parts . Dense gel containing metal skeleton, serve to strengthen the stereotypical strip and fixation. Sponge rubber foam tube is soft and elastic , plays compression deformation, pressure relief bounce function. In addition, some seal lip portion constituted by the color or affixed with glue fabric , color and beautiful decorative effect.
Door head and said seal structure , there are two , one for the whole sponge rubber foam tube , and another by a dense rubber and sponge rubber matrix composition . This seal glue or embedded in the door, and the door seal with , in order to increase the door and the body of the seal. Door seal head and said not every car are used , such as some economy cars would not , mainly from cost savings considerations.
Bonnet sealing strip made ​​of pure foam sponge rubber sponge rubber foam tube or pipe and compacting plastic composite structure for the engine cover with the front section of the seal. Trunk lid or rear door seal by a dense skeleton containing gum base and sponge rubber foam tubes that can withstand a certain impact, ensure that the back cover is closed seal.
There are front and rear window seal of windshield seals, glass run channel and window seals inside and outside bar .
Front and rear windshield seal surrounded by the pure gum type of connection is made , it also has considerable flexibility hardness, in between the windshield and the body play mat care, fixation and seal. Glass run channel seal by a different hardness dense rubber composition with inlaid into the body to ensure the accuracy of dimensions , to cable seals against leakage , noise effect. The lip seal is also flocked surface is attached , when the glass moves up and down the glass can be reduced and the sliding friction between the strips , but also can reduce the noise. This form is also used for sealing sunroof seal. Inside and outside the window type of glue made ​​from the pure or pure plastic and plastic composite type of structure, it comes with flocking surface , in addition to reducing the friction with the glass , but also play a decorative role .
Since the doors , hood and more complex geometry of the window , in the corner where the shape is often compared to adopt special seal. Therefore, there are car seal inscribed angle connector type and a variable cross-section type and other special seal, conventional sealing strip with a special seal both ends connected by molding processing or single-ended and then meet at the corner parts of the overall seal and parts of the installation requires special shape .
Past security seals  produced using artificial compression molding , process simple backward , shape a single , mostly H-shaped . The seal is now under the control produced using extrusion molding machine or injection molding techniques , including the composite extrusion , variable diameter extrusion, microwave curing , the surface coating technology. For example , under the control of the computer , the variable diameter seal extrusion technology in the extrusion process can change the size and shape of the cross-section shape varied , go. Thus, the seal can be close to the body , good sealing effect .

Liquid sealant effect it has five broad areas of application

Sealant is a primer with the shape of the sealing surface deformation, not flowing, there is a certain adhesion of the sealing material. Configuration is used to fill the gap , in order to play the role of the adhesive seal . Typically bituminous , natural resins or synthetic resins such as natural rubber or synthetic rubber or dry dry viscous material as the base material , with talc , clay , carbon black, titanium dioxide and inert fillers such as asbestos , then add plasticizers, solvents , curing agent and catalyst is made. Sealant has good sealing performance , and good heat resistance, pressure resistance, dense medium characteristics, use of simple , commonly used in mechanical and electrical products still seal between joints , as well as more complex threaded joints sealing , etc. , sealants, liquid sealant is generally divided into two categories with anaerobic ,security seals  and more commonly used liquid sealant role has the following five effects:
1 , the surface effect
No matter how solid gasket compression , it will not completely fill the joints on uneven, there will always be a gap at the interface , and the liquid sealant was able to fill all depressions , showing a good sealing effect.
2 , adhesion results
Liquid sealant in liquid form , has a certain viscosity , having a joining surface of the metal adhesion , sealing beneficial .
3 , the thin film effect
In the joints between the liquid sealant is screw fastening , the formation of a film with the same space at the same time is very consistent with the surface . Meanwhile , the thinner the film , the greater resilience , the better seal.
4 , flow and pressure resistance
Using liquid metal sealant joints , gaps are generally less than 0.1mm , and the liquid sealant is a liquid of high viscosity , it is difficult to flow , thereby maintaining its good sealing .
5, the volume change and mobility
Solid gasket leak-proof effect is the compression of the cushion sheet elastic deformation . The liquid sealant is leakproof volume in the compression and stretching deformation , it does not exist solid gasket compression deformation, so there is no compression fatigue , pull tight seals elastic failure , stress relaxation and other phenomena , and it is always connected adhesion of the interface , the interface can be prevented leakage .

Sunshine plate sealing tape Caution

Sunshine board the original tape. Only used for temporary protection sheet edge is intolerant of aging in the installation project, according to size cutting board , after cutting the tape must be project-specific installation requirements of regulations by the end wire seals plate bore grid, replacing the original tape down . Special tape installation works should good weather resistance , long-term use without losing its adhesion and mechanical strength , the installation operation, when taping .
To note the following:
( A ) ensure the plate edges are smooth .
( 2 ) to all wells blown clean , compressed air must be free of any impurities and dry .
( 3 ) To guarantee that using profiles, metal cover , protective ends of the U-shaped groove of the tape completely covers the installation is complete, there should not be exposed parts.
( 4 ) was added to the pre- installed before installing the final tape to check whether the loss , metal seal damage is found tape , must be replaced.

Brief sealant to save money

Recently , the famous American expert author doors sealant Analysis of how to reduce costs. Here we have to introduce the following is relatively feasible way to reduce the amount of binder . However, there is a sentence I still want to reiterate advice : Although the choice of the sealing glue to consider the cost issue , however, the choice really suitable for their sealing glue also need to consider aspects , should not suffer a great deal because they are cheap . Perhaps, inexpensive sealant can save a lot of money for us , but its performance is not necessarily perfect , and afterwards perhaps to compensate for the cost of expensive loophole . Therefore , the choice of sealant before sealing adhesions best first senior expert advice to determine the best match their needs with sealing glue . Delineation of the optional sealing glue , you can follow these steps to cut your costs sealant :
1 Do not use too much glue seal security . Sometimes , manufacturers that use more glue sealing , adhesion effect is more ideal , in fact , this is a wrong idea. Excessive use of adhesives, adhesives not only increase the cost , in fact, the connection will also affect results. If you have questions about the amount of sealant , it is best to consult a sealant product sales personnel or the manufacturer's technical staff, they will provide you with practical solutions .
(2) reduce the fill point of application equipment . If you often need to replace the adhesive residue , then try to reduce the fill point of application equipment .
3 prolong the shelf life of the sealing glue . If one could ever use a whole bucket of sealant, so as soon as possible to re- packaged sealant containers to prevent product freezing or evaporation .
4 Check the pressure equipment . If the device is too much pressure will cause the sealant waste and affect the life of the pump . Here you need to do is to determine a reasonable pressure setting , and to ensure strict compliance with the equipment operator settings .
5 regular testing and maintenance of your equipment . Regular maintenance will improve equipment performance , in addition, can also reduce equipment maintenance costs.
6 compared to other sealing products , water-based sealants can be significant cost savings. Therefore , the choice of sealant products , try to give priority to water seal products. Water-based sealing products easy to clean and easy to use conditions , unlike chemical truck seal glue , long-term maintenance of the equipment is required on the high investment .
7 repeated use of purified water and cleaning water . For the production of the device configuration can be used repeatedly washing water system, water purification and repeated use of the washing water .