聚四氟乙烯垫片在O型密封圈的应用

Teflon O type sealing ring is water cylinder, the basic circular cross section, also known as Teflon gasket neckring. If compared with self tightening PTFE gasket oil seal skeleton deviceIt is too simple, the layout and omits some things, neither skeleton nor realize self locking spring, only through the rubber elasticity and flexibility to achieve sealing effect.If the device is not adequate, most of the cooling water in the water jacket will penetrate the crankcase, resulting in smooth quality deterioration, oil degradation, aggravating the wear of the engine (including the moving parts), serious will directly guideThe major problems caused by burning tile axle, so the device of Teflon water should pay attention to the following matters:Cylinder seal groove is too deep or water resistance of PTFE gasket is too small, will cause the water resistance of PTFE gasket into the cylinder seal groove, reach out of the arc height must be high.Solution: a wrapped asbestos rope can be wrapped at the bottom of the water tank, coated with water resistant calcium base smooth grease, the water blocking O type seal is embedded in the water seal groove, and then the cylinder is pressed into the body seat hole.The water seal of the cylinder liner is too deep or the water blocking PTFE gasket is too thick, which will cause the water blocking PTFE gasket to be loaded into the water seal groove of the cylinder liner and exceed the height of the arc surfaceDifficult to squeeze the rubber water seal and even squeeze the cylinder liner.

 解决方案：橡胶水封用纱布均匀打磨，将阻水聚四氟乙烯垫片装入缸套水封槽后凸出的高度合适的时候就是 合适的。还要把光滑脂均匀的涂在密封圈表面，就可以将缸套压人机体座孔。

缸套水封槽深浅不一或者阻水聚四氟乙烯垫片粗细不均匀时，橡胶圈装上缸套后凸出（凹凸不均）。

 聚四氟乙烯垫片防止或减少泄漏的方法归纳为以下几种。

处理有毒、易燃、强腐蚀介质时应尽量减少聚四氟乙烯垫片的设置部位。

 打个比方说，在可以同时选择单级单吸和单级双吸离心泵输送上述物料时，应选择单级单吸，因为单吸离心泵比双吸离心泵少一处聚四氟乙烯垫片。

Solution: the rubber water seal is evenly polished with gauze, and it is the most appropriate when the water blocking PTFE gasket is loaded into the cylinder liner and the protruding height is appropriate. Grease the smooth grease evenlyOn the surface of the sealing ring, the cylinder liner can be pressed into the seat hole of the body.Cylinder seal groove depth or water resistance of PTFE gasket thickness is not uniform, the rubber ring is arranged on the cylinder convex (concave convex inequality).PTFE gasket to prevent or reduce leakage methods are summarized as follows.The setting place of PTFE gasket should be minimized when dealing with poisonous, flammable and strong corrosive medium.For example, when single stage single suction and single-stage double suction centrifugal pump can be used to transport the above material, single-stage single-stage suction hould be selected, because a single suction centrifugal pump has less PTFE pad than double suction centrifugal pumpSlice.

堵塞或隔离。

 静聚四氟乙烯垫片采用的各种聚四氟乙烯垫片胶、聚四氟乙烯垫片垫、胶黏剂就属于这一类。对于动密封，泄漏主要发生在高低压相连且具有相

对运动的部位，有相对运动就必然有间隙存在。只要把间隙堵塞住，就可以实现防止或减少泄漏，软填料聚四氟乙烯垫片属于这一类。隔离泄漏通

道，就是在泄漏通道中设置障碍，使通道切断（同时泄漏也被切断），机械聚四氟乙烯垫片、油封等接触式，聚四氟乙烯垫片都属于这一类。

 分隔或间隔。

 利用聚四氟乙烯垫片件将泄漏点与外界分隔开或利用气体、液体作为中间聚四氟乙烯垫片流体。如机械聚四氟乙烯垫片、隔膜聚四氟乙烯垫片、

气垫聚四氟乙烯垫片、中间有封液的双端面机械聚四氟乙烯垫片等。

贴合或黏合。

 利用研合聚四氟乙烯垫片面本身的加工质量使聚四氟乙烯垫片面贴合，或利用聚四氟乙烯垫片剂使聚四氟乙烯垫片面贴合达到聚四氟乙烯垫片的

目的，比方说汽缸中剖分面的聚四氟乙烯垫片、聚四氟乙烯垫片膏、聚四氟乙烯垫片胶等。

焊合或压合。

 利用焊接或钎接的方法将泄漏点堵塞或加压使接触处变形（如聚四氟乙烯垫片密封、软填料聚四氟乙烯垫片等），形成固定的结合达到聚四氟乙

烯垫片，比方说垫片聚四氟乙烯垫片、软填料聚四氟乙烯垫片等。

引出或注入。

 将泄漏流体引回吸入室或通常为低压的吸人侧（例如抽气聚四氟乙烯垫片、抽射器聚四氟乙烯垫片等）或将对被聚四氟乙烯垫片流体无害的流体

注入聚四氟乙烯垫片室，阻止被聚四氟乙烯垫片流体的泄漏，例如缓冲气聚四氟乙烯垫片）、氮气聚四氟乙烯垫片等。

 ⑦增加泄漏通道中的阻力。

 流体在通道中做泄漏流动时，会遇到阻力。阻力的大小与通道两端的压差、通道的长短、壁面的粗糙度以及通道中是否开槽（突然扩大、突然缩

小）等有关。因此，在同样的压差下，可把通道加设很多齿，或开各式沟槽，以增加泄漏时流体的阻力。从而阻止或减少泄漏，如迷宫聚四氟乙烯

垫片、问隙聚四氟乙烯垫片等。解决方案：要细心检查橡胶圈的问题，如果是水封槽的话，要将有问题的机件换下。

Blockage or isolation.All kinds of PTFE gasket, PTFE gasket and adhesive used in static PTFE gasket belong to this category. For dynamic seals, leakage occurs mainly at high and low pressure connections and phasesThere must be a gap between the parts of motion and relative motion. As long as the gap plug, can prevent or reduce leakage, soft packing PTFE gasket belongs to this 

ategory. Isolated leak throughRoad, that is, in the leakage channel set up obstacles, so that the channel cut off (at the same time leakage is cut off), mechanical PTFE gasket, oil seal and other contacts, PTFE gaskets belong to this category.Separation or interval.The leakage point is separated from the outside by using PTFE gasket, and the gas and liquid are used as the middle PTFE gasket fluid. Such as mechanical PTFE gasket, diaphragm PTFE gasket,Air cushion PTFE gasket, double end mechanical PTFE gasket with sealing liquid in the middle.Adhesion or adhesion.The PTFE gasket surface is bonded by using the processing quality of the PTFE gasket surface, or the PTFE gasket is applied to the PTFE gasket surface to reach the PTFE gasketFor example, the PTFE gasket, PTFE gasket, PTFE gasket and so on.Welding or pressing.Using welding or brazing method, the leakage point is blocked or pressurized to make the contact deformation (such as PTFE gasket seal, soft packing, PTFE gasket, etc.), forming a fixed combination to reach PTFEPTFE gasket, such as gasket, PTFE gasket, soft packing PTFE gasket and so on.Extraction or injection.The leakage flow back to the suction chamber or the suction side is usually low (such as exhaust ejector PTFE gasket, PTFE gasket etc.) or will be fluid fluid harmless PTFE gasketInjection of PTFE gasket chamber, to prevent PTFE gasket fluid leakage, such as cushion gas PTFE gasket, nitrogen PTFE gasket and so on.The increase of leakage channel resistance.When the fluid flows through the channel, it will encounter resistance. The size of the resistance is related to the pressure difference at the two ends of the channel, the length of the channel, the roughness of the wall, and whether the channel is slotted (suddenly enlarged and suddenly shrunk)Small) and so on. Therefore, under the same pressure difference, a number of teeth or grooves can be added to the channel to increase the resistance of the fluid during the leakage. So as to prevent or reduce leakage, such as labyrinth PTFEGasket, gap PTFE gasket and so on. Solution: to carefully check rubber ring problem, if it is water seal groove, the problem of mechanical parts should be replaced.