Combined type rotating axle seal

Abstract

The invention relates to a combined type rotary shaft seal and belongs to the technical field of hydraulic and pneumatic sealing piece. The shaft seal comprises a main pressure ring body and an auxiliary pressure ring body which are embedded between a shell hole and a rotating shaft and are sequentially assembled together along the axial direction; the main pressure ring body mainly comproses a bowl-shaped frame with a punch hole in the center and a peripheral rubber body and an inner ring rubber body which are wrapped on the periphery of the frame and around an inner hole and are connected into a whole; a liquid cavity is formed between one side of the auxiliary pressure ring body close to the main pressure ring body and the frame; a lip structure is formed on one side of the inner ring rubber body facing towards a high-pressure medium; the shaft seal also comprises an L-shaped movable retaining ring; the other side of the auxiliary pressure ring body far from the main pressure ring body is totally propped against the L-shaped vertical outer side of the movable retaining ring; and the L-shaped vertical inner side of the movable retaining ring is propped against the end face of the shell hole. The shaft seal can bear high pressure for a long time, obviously prolong the service life and remarkably improve the sealing performance.

Description

technical field [0001] The invention relates to a sealing device, in particular to a high-pressure resistant sealing rotary sealing structure used in hydraulic and pneumatic facilities, and belongs to the technical field of hydraulic and pneumatic seals. Background technique [0002] Skeleton rubber rotary shaft seal (hereinafter referred to as shaft seal) is a commonly used seal. This type of seal is usually used to seal the rotating surface in hydraulic and pneumatic transmission devices. Its basic structure can be found in the corresponding sealing technical manual. Usually Installed in an annular groove on a cylindrical surface. The rubber ring seals the rotating shaft, and the front and rear faces are respectively subjected to the isolated high and low pressure media. [0003] As far as the applicant knows, in hydraulic and pneumatic transmission parts, especially in products such as hydraulic pumps and hydraulic motors, the basic power output is rotational torque, so ...

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Problems solved by technology

[0004] The Chinese patent “Compact High Pressure Rotary Shaft Sealing Ring” (Patent No. ZL200620070646.8) which was previously applied by the applicant has better solved the problem of pressure-bearing sealing and compact structure, and its ability to withstand back pressure has far exceeded that of ordinary shaft seals; However, when the shaft seal is directly used in products with high-pressure medium communication (such as high-speed distribution cycloid hydraulic motor), its ability to withstand high pressure is insufficient

For this reason, another Chinese patent "back pressure high-pressure shaft seal" (patent No. ZL200620078011.2) that the applicant applied for earlier can solve the problem of high pressure resistance at the shaft seal that directly communicates with the high-pressure medium; Medium wear is high, so it is difficult to withstand high pressure for a long time, and there is still the problem of seal failure

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