CN2172819Y

CN2172819Y - Sealing device for piston and cylinder body in oil cylinders

Info

Publication number: CN2172819Y
Application number: CN 93241435
Authority: CN
Inventors: 葛仲林; 夏佰泓
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-12
Filing date: 1993-10-12
Publication date: 1994-07-27
Anticipated expiration: 2003-10-12

Abstract

The utility model relates to a grid type expanding sealing ring, which is suitable for sealing a piston in an oil cylinder and a cylinder body, and particularly suitable for sealing the piston and the cylinder body of a single hydraulic prop in the mining roof support of a coal mine. The surface of an outer cylinder is uniformly provided with two to five bulged rings forming a circular arc shape along circumferential direction, axial leakproof lattices are arranged between the rings, space between the lattices is 8-12 mm, and an upper and a lower lug bosses in the surface of the outer cylinder are respectively provided with open elastic steel wire rings. The utility model has the advantages of leakage prevention, stable pressure for working solution in the cylinder, long service life and low mining cost.

Description

Sealing device for piston and cylinder body in oil cylinders

The utility model relates to a kind of form tension seal ring, is applicable to the sealing of piston and cylinder body in the hydraulic type oil cylinder, more is applicable in the colliery sealing of piston and cylinder body in the hydraulic prop, is particularly useful for the pitted occasion sealing of cylinder body.

Existing y-type seal ring, its external diameter is line with inboard wall of cylinder block and contacts (shown in (1a) among Fig. 1), and seal by the hydraulic pressure tension, yielding, when oil cylinder inner wall coating the part pit occurs because of becoming rusty solely or wearing and tearing, the phenomenon of leakage then takes place, can't keep working fluid pressure, cause oil cylinder to be scrapped, thereby expend bigger.

For overcoming above-mentioned shortcoming, the utility model provides a kind of many loop contacts, leakproof of many lattice and the form tension seal ring that adopts the tension steel wire to carry out wear compensation.

Fig. 1 is the plan view of existing seal ring, Figure 1A is the A-A part sectioned view of Fig. 1, Fig. 2 is a plan view of the present utility model, Fig. 2 A is its front elevation, and Fig. 2 B is its A-A part sectioned view, and 1a is an annular wire, 2 is seal ring, 2a is a garden arc bulge loop, and 2b is the leakproof lattice, and 3 is elastic opening steel wire ring.

In conjunction with Fig. 2 structure of the present utility model and embodiment are described as follows:

The utility model is evenly equipped with 2～5 garden arc bulge loop 2a along garden Zhou Fangxiang on the outer garden cylinder of lengthening, be respectively arranged with opening elastic wire ring 3 on convex platform in the cylinder of garden and the bottom boss outside, and steel wire diameter d is 2～4mm.Also can be evenly equipped with leakproof lattice 2b vertically between per two bulge loops, two compartments distance is 8～12mm.Seal ring 2 is loaded in the seal groove on the cylinder of the outer garden of piston, when piston and cylinder body or pitted cylinder body are done relative movement, hydraulic pressure adds the tension of steel wire 3 and the elasticity of cushion rubber, bulge loop 2a is close on the inwall of cylinder body, play automatic compensation and carry out the effect of leak stopping, the bulge loop of back has been strengthened this leak stopping effect, forms defence line, a few road; The effect of leakproof lattice: support collar 2a reduces the distortion of bulge loop, thereby has played the leakproof effect, and elastic wire ring 3 is 1～3.

Advantage of the present utility model: 1, the sealing ring external diameter contacts with inboard wall of cylinder block by a long loop wire contact and becomes 2～5 bulge loop contacts, and adopts many lattice and elastic wire ring, plays the leakproof effect; 2, adopted the tension steel wire, the defective that can cause the wearing and tearing of casing wall and sealing ring is carried out auto-compensation, has strengthened the leakproof effect; 3, can keep the stable of the interior working fluid pressure of cylinder; 4, owing to adopt the utility model, can make the waste and old oil cylinder recycling of part, prolong maintenance cycle and the service life of equipment, thereby reduced mining costs.

Claims

1, a kind of form tension seal ring is characterized in that, seal ring (2), and uniform garden arc bulge loop (2a) on its outer garden cylinder along garden Zhou Fangxiang, and be supported in respectively on seal ring (2) inwall, the split ring steel wire (3) on the lower convex platform constitutes.

2, by the described seal ring of claim 1, it is characterized in that, be distributed between per two bulge loops (2a), be arranged with leakproof lattice (2b) vertically.

3, by claim 1 or 2 described seal rings, it is characterized in that garden arc bulge loop (2a) is 2～5, the compartment distance of leakproof lattice (2b) is 8～12mm.

4, by claim 1 or 2 described seal rings, it is characterized in that split ring steel wire ring (3) is 1～3, its steel wire diameter is 2～4mm.