CN101532523A

CN101532523A - Novel hydraulic cylinder

Info

Publication number: CN101532523A
Application number: CN200810101757A
Authority: CN
Inventors: 周承惠; 周磊; 张相安; 张相新
Original assignee: BEIJING NIUXI HYDRAULIC TECHNOLOGY INSTITUTE
Current assignee: BEIJING NIUXI HYDRAULIC TECHNOLOGY INSTITUTE
Priority date: 2008-03-12
Filing date: 2008-03-12
Publication date: 2009-09-16

Abstract

The invention discloses a novel high pressure resistant hydraulic cylinder with long service life, cost reduction and no medium leakage. A piston 1 and an end cover 2 of the hydraulic cylinder adopt a novel sealing technology that medium pressure extrudes gasket bodies from internal cavities 7 and 8 of novel hollow gaskets 5 and 6 to lead the gasket bodies to be close to a cylinder body 10 and a piston rod 11, thus realizing the sealing. The larger the medium pressure is, the closer the joint between the sealing faces of the n-shaped gaskets 5 and 6 and the sealing faces of the cylinder body 10 and the piston rod 11 is, and the sealing effect is good. As the internal cavity of the n-shaped gasket is hollow, abrasion is not large in work; and during non-working process, the abrasion of the gasket body is smaller. Simultaneously, the medium pressure realizes the sealing by the extrusion to the gasket bodies from inside. Under the extrusion of the medium pressure, the whole rubber gasket bears stress evenly, has little distortion and can not cause permanent distortion. Therefore, the service life of sealing elements is prolonged. The hydraulic cylinder not only doubly increases the service life, has no medium leakage and can bear larger pressure than the existing hydraulic cylinder, but also greatly reduces cost compared with the existing hydraulic cylinder.

Description

A kind of novel hydraulic cylinder

The present invention relates to the fluid transmission field.

As everyone knows, existing oil hydraulic cylinder, O shape circle, Yx shape circle and combined seal ring sealing technique thereof are adopted in its piston and end cap motive sealing for a long time.In rubber seal sealing techniquies such as O shape circle, Yx shape circle, during hydraulic cylinder works, working medium pressure makes it be adjacent to cylinder body and piston rod surface and realizes sealing from seal ring external compression sealing circle body, seal element with cylinder body, piston rod relative movement in be easy to be damaged, thereby dielectric leakage takes place; If working medium pressure is too high, seal element then can produce distortion, and medium passes through and mistake, and seal failure causes the existing hydraulic cylinder works life-span short, can not bear high pressure.And O shape circle, Yx shape circle and combined seal ring sealing technique thereof cost an arm and a leg, requirement machining accuracy height, cause the oil hydraulic cylinder cost significantly to rise, but because its sealing mechanism is all the same basically with rubber seal sealing techniquies such as O shape circle, Yx shape circles, sealing effect is not very good yet, exist the dielectric leakage problem always, can not anti-very high pressure.

Purpose of the present invention is exactly the novel hydraulic cylinder that will provide a kind of high voltage bearing, no dielectric leakage, long service life and cost to reduce.

Technological scheme of the present invention is achieved in that

Adopt pressure medium to make it be adjacent to cylinder body 10 and piston rod 11 and realize the novel sealing technology of sealing between the piston block 1 of oil hydraulic cylinder and cylinder body 10, end cap 2 and the piston rod 11 from inner chamber 7, the 8 crush seal circle bodies of novel

hollow sealing circle

5,6.

Be characterized in: the groove 3 that 1) some is arranged on hydraulic cylinder piston piece 1, end cap 2 column working; Quantity is counted from zero, does not limit to requirement; 2) have a plurality of seal ring mounting grooves on hydraulic cylinder piston piece 1, the end cap 2, the road is several to be required to decide according to technology capability, and quantity is not limit; 3) n

shape seal ring

5,6 just is installed in each road mounting groove respectively; 4) both sides of the working surface inboard of n

shape seal ring

5,6 and seal ring constitute hollow cavity 7,8, because

hollow sealing circle

5,6 sectional shapes are like n shape, so be called n shape seal ring; 5) on the sealed working face of n

shape seal ring

5,6 boss 9 is arranged, boss 9 quantity are decided according to service behaviour such as the pressure of usage requirement and technical parameter, and quantity is counted from zero, do not limit to requirement; 6) have port hole 4 to lead to each seal ring mounting groove on hydraulic cylinder piston piece 1, end cap 2 end faces, boot media enters the inner chamber 8 that axle is used seal ring 6 with the inner chamber 7 and the hole of n shape seal ring 5, and port hole 4 can be shared, also can separate separately.7) according to the technology capability requirement, hydraulic cylinder piston piece 1 and cylinder body 10, end cap 2 and piston rod 11 can adopt novel

hollow sealing circle

5,6 sealing techniquies simultaneously, also wherein a place adopts novel

hollow sealing circle

5,6 sealing techniquies, and another place adopts other sealing techniquies.

The invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is the cut-away view that adopts the novel hydraulic cylinder of novel

hollow sealing circle

5,6 sealing techniquies

Fig. 2 is the cut-away view of axle with n shape seal ring

Fig. 3 is the cut-away view of hole with n shape seal ring

The groove 3 that some as can be seen from Figure 1, is arranged on hydraulic cylinder piston piece 1, end cap 2 column working; Have multiple-sealed circle mounting groove on hydraulic cylinder piston piece 1, the end cap 2, n

shape seal ring

5,6 just is installed in each road seal ring mounting groove; The end face of hydraulic cylinder piston piece 1, end cap 2 has some port holes 4 and each seal ring mounting groove to be interconnected.Port hole 4 can be shared, also can separate separately.End cap 2 is provided with guide ring 12.

Axle among Fig. 2 is with having boss 9 on n shape seal ring 5 its sealed working faces, and boss 9 quantity decide according to the service behaviour and the technical parameter of usage requirement, and quantity is counted from zero, does not limit to requirement.

Hole among Fig. 3 is with having boss 9 on n shape seal ring 6 its sealed working faces, and boss 9 quantity are decided according to the service behaviour and the technical parameter of usage requirement, and quantity is counted from zero, does not limit to requirement.

As can be seen from Figure 1, have multiple-sealed circle mounting groove in the close two end faces of hydraulic cylinder piston piece 1, end cap 2, n

shape seal ring

5,6 just is installed in each road mounting groove respectively; The both ends of the surface of piston block 1 have some port holes 4 and lead to each road seal ring mounting groove, medium can be imported the inner chamber 8 that axle is used n shape seal ring 6 with the inner chamber 7 and the hole of n shape seal ring 5, have been full of medium in the seal ring inner chamber 7,8.Because the effect of pretightening force when being subjected to installing, n

shape seal ring

5,6 is close to the sealed working face of cylinder body 10, piston rod 11.After oil hydraulic cylinder is started working, when pressure strengthens, pressure medium is reached the inner chamber 7 of seal ring via port hole 4 by medium, 8, make axle n shape seal ring 5 and cylinder body 10, the hole closely contacts with the working surface of n shape seal ring 6 and piston rod 11, and each road axle n shape seal ring 5, the hole forms labyrinth seal with the groove 3 on the column working of boss 3 on n shape seal ring 6 sealed working faces and piston block 1, medium by the time pressure progressively decay, less than n

shape seal ring

5,6 inner chamber 7, pressure medium in 8, medium can not take place pass through leakage phenomenon, obtain fabulous sealing effect.And pressure medium is big more, and the sealed working face of n

shape seal ring

5,6 sealed working faces and cylinder body 10, piston rod 11 is fitted tight more, and sealing effect is fine.Since n shape seal ring inner chamber hollow, wearing and tearing and little in the working stroke; And in the inoperative stroke, it is slight to rub between sealing circle body and cylinder body 10, the piston rod 11, and it is very little to wear and tear.Simultaneously, pressure medium is that the crush seal circle body is realized sealing internally, and whole rubber seal is evenly stressed under the extruding of pressure medium, and deformation is very little, can not produce permanent set, and n

shape seal ring

5,6 operating lives have obtained prolongation.Oil hydraulic cylinder of the present invention not only operating life is multiplied, and no dielectric leakage more can bear the pressure more much higher than existing oil hydraulic cylinder, and the existing oil hydraulic cylinder of cost reduces significantly.

Claims

1. the novel hydraulic cylinder of high voltage bearing, no dielectric leakage a, long service life; It is characterized in that: adopt working medium pressure to make it be adjacent to cylinder body 10 and piston rod 11 and realize sealing between the piston 1 of oil hydraulic cylinder and cylinder body 10, end cap 2 and the piston rod 11 from inner chamber 7, the 8 crush seal circle bodies of novel hollow sealing circle 5,6.

2. the groove 3 that some is arranged on novel hydraulic cylinder piston block 1 according to claim 1, end cap 2 column working, quantity are counted from zero, do not limit to requirement.

3. have a plurality of seal ring mounting grooves on novel hydraulic cylinder piston block 1 according to claim 1, end cap 2 column working, the road is several to be required to decide according to technology capability, and quantity is not limit.

4. the end face of hydraulic cylinder piston piece 1, end cap 2 has some port holes 4 and each seal ring mounting groove to be interconnected.Port hole 4 can be shared, also can separate separately.

5. the n shape seal ring 5,6 that novel hydraulic cylinder according to claim 1 adopts just is installed in the seal ring mounting groove.

6. the working surface inboard of n shape seal ring 5,6 according to claim 4 and the both sides of seal ring constitute hollow cavity 7,8, have boss 9 on the sealed working face of seal ring, and its quantity is counted from zero, do not limit to requirement.

7. n shape seal ring according to claim 4 has axle n shape seal ring 5, hole n shape seal ring 6 forms.

8. according to the described novel hydraulic cylinder of claim 1, can require to adopt simultaneously novel hollow sealing circle 5,6 sealing techniquies according to technology capability between piston 1 and cylinder body 10, end cap 2 and the piston rod 11, also wherein a place adopts novel hollow sealing circle 5,6 sealing techniquies, and another place adopts other sealing techniquies.