CN2162561Y

CN2162561Y - UV-shape two-seabed one-replenished type moving sealing device

Info

Publication number: CN2162561Y
Application number: CN 93206656
Authority: CN
Inventors: 刘成华; 吴晓成
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-23
Filing date: 1993-03-23
Publication date: 1994-04-20
Anticipated expiration: 2003-03-23

Abstract

The utility model relates to a sealing device used for reciprocating motion hydraulic cylinders of various specifications. The sealing device can solve the leakage problem of a cylinder because a cylinder body is rubbed, the cylinder body is scuffed, the coating of the cylinder body is desquamated, and a sealing ring is excessively worn in long-term use. The sealing device has the structures that a piston is provided with a round table, the centre of the round table is provided with a compensation oil channel, the sealing ring is provided with a compensation cavity, and one end surface of the sealing ring is provided with a V-shaped groove. The two-sealed and one-replenished sealing purpose can be achieved, and meanwhile, the motion stability of the sealing ring can be raised during the reciprocating motion.

Description

UV-shape two-seabed one-replenished type moving sealing device

What the utility model was related is a kind of two-seabed one-replenished type packed-piston device that is used for hydraulic machinery all size reciprocating movement oil cylinder.

The to-and-fro motion means of press seals of oil hydraulic cylinder employing at present mostly is O type and lip-type seal circle, because its geometrical shape is in the to-and-fro motion of machinery, under the effect of rub-moment, cushion rubber and sealing surface produce bigger contact stress, it can be extruded the oiling agent between sealing contact surface, be difficult for to form oil film, produce dry friction and cause the excessive wear seepage, make stability of motions poor.After the long-term use of oil hydraulic cylinder, degree of finish descends in addition, and inwall has wearing and tearing, scuffing in various degree, and mechanical property descends, and causes seepage, and solving leakage problems with conventional seal ring has certain difficulty.

The purpose of this utility model is to solve oil hydraulic cylinder reciprocating movement sealing leakage problems, provide a kind of long service life, adaptability strong, can make the oiling agent between seal ring and the sealing surface be difficult for extruding, making new type sealing device simple, good seal performance.

The purpose of this utility model is achieved in that seal arrangement is mainly by UV type compensating ring (8), back-up ring (4) and piston (9) constitute, piston (9) is gone up design a garden platform (10), there is compensation channel (11) centre, " U " type compensated cavity (12) is arranged in the UV compensating ring (8), and an end face of compensating ring has " V " type groove (13).

The utility model compared with prior art can make friction reduce greatly, also can compensate automatically after the friction, sealability and sealing life improve a lot, because the reduction of friction, can reduce its steady state error, improve stable state accuracy and stability, the speed of response and the various index of quality all improve a lot.

Fig. 1 is a structural representation of the present utility model.Among the figure: (1) cylinder barrel; (2) live body; (3) O type circle; (4) back-up ring; (5) connect steel wire; (6) guide ring; (7) anti-extrusion ring; (8) UV type compensating ring; (9) piston; (10) garden platform; (11) compensation channel;

Fig. 2 is a UV type compensating ring structural representation.Among the figure: (12) U type compensated cavity; (13) V-type groove.

Below in conjunction with accompanying drawing the utility model is described further:

Seal arrangement mainly is to be made of UV type compensating ring (8), back-up ring (4) and piston (9), piston (9) is gone up design Yi Yuantai (10), there is compensation channel (11) centre, and the purpose of garden platform is to realize and the stability of motions of raising seal ring in to-and-fro motion.Design has " U " type compensated cavity (12) in the UV compensating ring (8), end face design " V " type groove (13) of UV compensating ring (8).Pressure oil in oil hydraulic cylinder enters " U " type compensated cavity (12) of compensating ring through piston compensated passage (11), pressure oil enters in seal ring " V " the type groove (13) simultaneously, its UV type compensating ring (8) is close on the inboard wall of cylinder block, thereby reaches the purpose that two front covers are mended.

Claims

A kind of UV type two-seabed one-replenished type dynamic seal apparatus, constitute by UV type compensating ring (8), back-up ring (4) and piston (9), it is characterized in that a garden platform (10) is arranged on the piston (9), there is compensation channel (11) centre, " U " type compensated cavity (12) is arranged in the UV type compensating ring (8), and an end face of compensating ring has " V " type groove (13).