CN201310502Y

CN201310502Y - Novel sealing hydraulic cylinder

Info

Publication number: CN201310502Y
Application number: CNU2008201596017U
Authority: CN
Inventors: 凤羽佳
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-10-30
Filing date: 2008-10-30
Publication date: 2009-09-16
Anticipated expiration: 2018-10-30

Abstract

The utility model discloses a novel sealing hydraulic cylinder, comprising a cylinder cover and a cylinder body, wherein a piston and a piston rod are provided in the cylinder body; the external circumference of the piston wall is provided with a sealing ring; the external circumference of the piston wall at the head of the piston is provided with an overflow hole; a retaining ring is provided between the overflow hole and the sealing ring; and a support ring is provided on the piston. The novel sealing hydraulic cylinder can resolve the leakage problem of prior hydraulic cylinder caused by back pressure and low sealing property, while the internal leakage brings efficiency reduction, climbing and lapping injury of cylinder, and the external leakage brings environment pollution and hidden dangers. The novel hydraulic device with sealing function eliminates leakage, has simple exchange of the sealing ring, short maintenance time, low cost and long service life.

Description

A kind of novel seal oil hydraulic cylinder

Technical field

The utility model belongs to a kind of mechanical hydraulic unit of rubber seal function, specifically, relates to a kind of novel seal oil hydraulic cylinder.

Background technique

At present, the oil hydraulic cylinder of band sealing function commonly known in the art is made up of piston rod, dust ring, cylinder cap, y-type seal ring, and during hydraulic cylinder works, piston is to-and-fro motion in oil hydraulic cylinder, and hydraulic pressure can be converted into mechanical energy.But oil hydraulic cylinder of the prior art owing to exist technology such as back pressure, sealing difference to cause oil hydraulic cylinder to have leakage problem in the cylinder, its internal leakage will cause cylinder decrease in efficiency, creep, grind phenomenon such as wound; Its external leakage will bring environmental pollution, cause technical problems such as hidden danger.

The model utility content

Technical problem to be solved in the utility model is, in the prior art owing to exist technology such as back pressure and sealing difference to cause oil hydraulic cylinder to have leakage problem, its internal leakage will cause cylinder decrease in efficiency, creep, grind phenomenon such as wound; Its external leakage will bring environmental pollution, cause technical problems such as hidden danger, and a kind of novel seal oil hydraulic cylinder is provided.

Technological scheme provided by the utility model is, a kind of novel seal oil hydraulic cylinder, comprise cylinder cap, cylinder body, be arranged in piston and piston rod in the cylinder body, on the excircle of described piston wall, be provided with seal ring, on the piston wall excircle of described piston crown, be provided with overflow hole, between described overflow hole and seal ring, be provided with ring washer, also be provided with supporting ring on the described piston.

Described ring washer is that the seal ring that prevents that is arranged on the seal ring back runs groove and/or is squeezed into the poly-tetrem alkene back-up ring in gap.

Described supporting ring is to stick and form with guide-soft-band.

Described oil hydraulic cylinder also is provided with combination seal, described combination seal comprises elastomer, slip ring, L shaped support ring and guide ring, and described elastomer compressive deformation contacts with described slip ring, the compression slip ring, slip ring is sealed, and described L shaped supporting ring is near guide ring.

Described oil hydraulic cylinder also is provided with y-type seal ring, and described y-type seal ring is sleeved on the piston rod, is provided with little gland at the front end of described y-type seal ring.

The buckle chamfering of ending of described cylinder cap is made as 45 °, is in the leg-of-mutton annular space in the chamfering of cylinder cap and the cross section that forms above the guide sleeve, the seal ring that one cross section of packing into is O shape.

Adopt technological scheme provided by the utility model, can effectively solve in the prior art owing to exist technology such as back pressure and sealing difference to cause oil hydraulic cylinder to have leakage problem, its internal leakage will cause cylinder decrease in efficiency, creep, grind phenomenon such as wound; Its external leakage will bring environmental pollution, cause technical problems such as hidden danger, simultaneously the utility model provides a kind of hydraulic pressure installation of novel band sealing function, and this device has not have and leaks, changes easy, the advantages such as the repair time is short, cost is low, long service life of seal ring.

Description of drawings

Fig. 1 is a hydraulic cylinder structure schematic representation in the prior art;

Fig. 2 is the structural representation of the utility model oil hydraulic cylinder;

Fig. 3 is the combination seal structural representation;

Fig. 4 is the utility model y-type seal ring structural representation;

Fig. 5 has 45 ° of cylinder cap structural representations that end the buckle chamfering for the utility model;

Wherein, 1 is piston rod; 2 is dust ring; 3 is cylinder cap; 4 is y-type seal ring; 5 is cylinder body; 6 is overflow hole; 7 is back-up ring; 8 is piston; 9 is support ring; 10 is seal ring; 11 is sliding bar; 12 is elastomer; 13 is L shaped support ring; 14 is guide ring; 15 is little gland; 16 is the O RunddichtringO.

Embodiment

As shown in Figure 1, the oil hydraulic cylinder of band sealing function is made up of piston rod 1, dust ring 2, cylinder cap 3, y-type seal ring 4 in the prior art, and during hydraulic cylinder works, piston 8 to-and-fro motion in oil hydraulic cylinder can be converted into mechanical energy with hydraulic pressure.

Technological scheme provided by the utility model is, a kind of novel seal oil hydraulic cylinder, comprise cylinder cap 3, cylinder body 5, be arranged in piston 8 and piston rod 1 in the cylinder body 5, on the excircle of described piston 8 walls, be provided with seal ring 10, on the piston 8 wall excircles of described piston 8 heads, be provided with overflow hole 6, between described overflow hole 6 and seal ring 10, be provided with ring washer, also be provided with support ring 9 on the described piston 8; Described ring washer is that the seal ring 10 of preventing that is arranged on seal ring 10 back runs grooves and/or is squeezed into the poly-tetrem alkene back-up ring 7 in gap; Described support ring 9 is to stick and form with guide-soft-band.

The utility model adopts the compound direction method, as shown in Figure 2, runs groove and clamp-ons in the gap for preventing cushion rubber, adds a poly-tetrem alkene back-up ring 7 behind at cushion rubber; In order to eliminate back pressure, offer overflow hole 6; For preventing that wound is ground in friction between piston 8 and hydraulic cylinder 5, piston rod 1 and the cylinder cap 3, adopt that the method that adds support ring 9 guiding solves.The material of support ring 9 is glutinous and form with guide-soft-band, and this material has absorbing, friction resistant, slide guide good, can avoid grinding with cylinder body 5 shortcomings such as wound.

Oil hydraulic cylinder described in the utility model also is provided with combination seal, described combination seal comprises elastomer 12, slip ring, L shaped support ring 13 and guide ring 14, described elastomer 12 compressive deformations contact with described slip ring, the compression slip ring, slip ring is sealed, and described L shaped support ring 13 is near guide ring 14.

The utility model adopts the combination seal method; As shown in Figure 3, elastomer 12 compressive deformations compression slip ring, slip ring is sealed, elastomer 12 and slip ring pressurized when L shaped support ring 13 prevents to be subjected to high pressure and be damaged, guide ring 14 is near L shaped support ring 13, can reduce piston 8 sizes and avoid direct the contact and friction between cylinder barrel and the piston 8, the characteristics of this structure are that pressure is big more, and seal action is reliable more.

Damaging this point easily at y-type seal ring 4 solves in order to following method:

Oil hydraulic cylinder described in the utility model also is provided with y-type seal ring 4, and described y-type seal ring 4 is sleeved on the piston rod 1, is provided with little gland 15 at the front end of described y-type seal ring 4.

As shown in Figure 4, when changing the outfit seal ring 10 after the improvement, needn't pull down front end housing 3, only tear the little gland 15 that increases newly open, take out old circle, be inserted in a new circle again, compress little gland 15 and get final product with hook.Because seal ring 10 is fashionable to piston rod 1 cover, external diameter does not have constraint, therefore can not scratch seal lip.After the improvement, not only the leakage of oil problem at front end housing 3 places is resolved, and changes when enclosing and need not pull down front end housing 3 again, has saved engineering time, and ante-chamber oil also can not run off and befouling environment.

The buckle chamfering of ending of cylinder cap 3 described in the utility model is made as 45 °, is in the leg-of-mutton annular space in the chamfering of cylinder cap 3 and the cross section that forms above the guide sleeve, and one cross section of packing into is O RunddichtringO 16.

The utility model is 45 ° with the only buckle of cylinder cap 3, is in the leg-of-mutton annular space in the chamfering of cylinder cap 3 and the cross section that forms above the guide sleeve, and one cross section of dress people is O RunddichtringO 16.Sealing the leakage oil from guide sleeve and cylinder body 5 matching gaps, its effect is the same with original seal arrangement.Improve when the back is each changes seal ring 10 very easyly, need not require great effort again and time-consumingly remove to tear open the guiding copper sheathing, the repair time is shortened greatly, the corresponding reduction of cost, and avoided the leakage of hydraulic oil effectively.

Claims

1, a kind of novel seal oil hydraulic cylinder, comprise cylinder cap (3), cylinder body (5), be arranged in piston (8) and piston rod (1) in the cylinder body (5), on the excircle of described piston (8) wall, be provided with seal ring (10), it is characterized in that, on piston (8) the wall excircle of described piston (8) head, be provided with overflow hole (6), between described overflow hole (6) and seal ring (10), be provided with ring washer, also be provided with support ring (9) on the described piston (8).