聚四氟乙烯墊片在O型密封圈的應(yīng)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.

 解決方案：橡膠水封用紗布均勻打磨，將阻水聚四氟乙烯墊片裝入缸套水封槽后凸出的高度合適的時(shí)候就是 合適的。還要把光滑脂均勻的涂在密封圈表面，就可以將缸套壓人機(jī)體座孔。

缸套水封槽深淺不一或者阻水聚四氟乙烯墊片粗細(xì)不均勻時(shí)，橡膠圈裝上缸套后凸出（凹凸不均）。

 聚四氟乙烯墊片防止或減少泄漏的方法歸納為以下幾種。

處理有毒、易燃、強(qiáng)腐蝕介質(zhì)時(shí)應(yīng)盡量減少聚四氟乙烯墊片的設(shè)置部位。

 打個(gè)比方說(shuō)，在可以同時(shí)選擇單級(jí)單吸和單級(jí)雙吸離心泵輸送上述物料時(shí)，應(yīng)選擇單級(jí)單吸，因?yàn)閱挝x心泵比雙吸離心泵少一處聚四氟乙烯墊片。

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.

堵塞或隔離。

 靜聚四氟乙烯墊片采用的各種聚四氟乙烯墊片膠、聚四氟乙烯墊片墊、膠黏劑就屬于這一類。對(duì)于動(dòng)密封，泄漏主要發(fā)生在高低壓相連且具有相

對(duì)運(yùn)動(dòng)的部位，有相對(duì)運(yùn)動(dòng)就必然有間隙存在。只要把間隙堵塞住，就可以實(shí)現(xiàn)防止或減少泄漏，軟填料聚四氟乙烯墊片屬于這一類。隔離泄漏通

道，就是在泄漏通道中設(shè)置障礙，使通道切斷（同時(shí)泄漏也被切斷），機(jī)械聚四氟乙烯墊片、油封等接觸式，聚四氟乙烯墊片都屬于這一類。

 分隔或間隔。

 利用聚四氟乙烯墊片件將泄漏點(diǎn)與外界分隔開或利用氣體、液體作為中間聚四氟乙烯墊片流體。如機(jī)械聚四氟乙烯墊片、隔膜聚四氟乙烯墊片、

氣墊聚四氟乙烯墊片、中間有封液的雙端面機(jī)械聚四氟乙烯墊片等。

貼合或黏合。

 利用研合聚四氟乙烯墊片面本身的加工質(zhì)量使聚四氟乙烯墊片面貼合，或利用聚四氟乙烯墊片劑使聚四氟乙烯墊片面貼合達(dá)到聚四氟乙烯墊片的

目的，比方說(shuō)汽缸中剖分面的聚四氟乙烯墊片、聚四氟乙烯墊片膏、聚四氟乙烯墊片膠等。

焊合或壓合。

 利用焊接或釬接的方法將泄漏點(diǎn)堵塞或加壓使接觸處變形（如聚四氟乙烯墊片密封、軟填料聚四氟乙烯墊片等），形成固定的結(jié)合達(dá)到聚四氟乙

烯墊片，比方說(shuō)墊片聚四氟乙烯墊片、軟填料聚四氟乙烯墊片等。

引出或注入。

 將泄漏流體引回吸入室或通常為低壓的吸人側(cè)（例如抽氣聚四氟乙烯墊片、抽射器聚四氟乙烯墊片等）或?qū)?duì)被聚四氟乙烯墊片流體無(wú)害的流體

注入聚四氟乙烯墊片室，阻止被聚四氟乙烯墊片流體的泄漏，例如緩沖氣聚四氟乙烯墊片）、氮?dú)饩鬯姆蚁〾|片等。

 ⑦增加泄漏通道中的阻力。

 流體在通道中做泄漏流動(dòng)時(shí)，會(huì)遇到阻力。阻力的大小與通道兩端的壓差、通道的長(zhǎng)短、壁面的粗糙度以及通道中是否開槽（突然擴(kuò)大、突然縮

�。┑扔嘘P(guān)。因此，在同樣的壓差下，可把通道加設(shè)很多齒，或開各式溝槽，以增加泄漏時(shí)流體的阻力。從而阻止或減少泄漏，如迷宮聚四氟乙烯

墊片、問(wèn)隙聚四氟乙烯墊片等。解決方案：要細(xì)心檢查橡膠圈的問(wèn)題，如果是水封槽的話，要將有問(wèn)題的機(jī)件換下。

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.