CN202756333U

CN202756333U - Hydraulic cylinder

Info

Publication number: CN202756333U
Application number: CN 201220203441
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: 2012-05-07
Filing date: 2012-05-07
Publication date: 2013-02-27
Anticipated expiration: 2022-05-07

Abstract

Disclosed is a novel hydraulic cylinder which is low in dielectric leakage, long in service life, reliable in operation and high in stability. Sealing between a piston block and a cylinder body is achieved by a composite sealing system composed of an n-shaped seal ring and a combined sealing element. Pressure of working media extrude a seal ring body from a cavity of the n-shaped seal ring to expand out to achieve sealing, and the larger the pressure is, the higher the sealing effect is, so that dielectric leakage can be reduced greatly, sealing effect is high, and service life is long. A sealing mechanism of the n-shaped seal ring is self-dynamic-balance of pressure of working media, machining precision of a cylinder need not be increased by using the n-shaped seal ring, and operation condition of the combined sealing element in the composite sealing system is not influenced, so that the novel hydraulic cylinder has double sealing effect of the n-shaped seal ring and the combined sealing element. Compared with the prior art, the novel hydraulic cylinder has the advantages of low dielectric leakage, high sealing effect, long service life, reliability in operation condition, stability and the like.

Description

A kind of oil hydraulic cylinder

Technical field

The utility model relates to a kind of hydraulic machinery, specifically a kind of novel hydraulic cylinder.Belong to machinery manufacturing technology field.

Background technique

As everyone knows, existing oil hydraulic cylinder, O shape circle, Yx shape circle and combined sealing component sealing technique are adopted in its piston motive sealing for a long time.In the rubber seal sealing techniquies such as O shape circle, Yx shape circle, working medium pressure makes it be adjacent to corresponding sealant surface and realizes sealing from seal ring external compression sealing circle body, seal element with the seal relative movement in be easy to be damaged, very easily produce dielectric leakage.Because extrusion-deformation generation prestressing force reached sealing effect when O shape circle, Yx shape were enclosed the class seal ring by assembling, seal ring is in deformation state for a long time, easily produces permanent deformation forfeiture elasticity, can not keep good sealing effect the long period.Because the elastic material yield rate is low, and the seal elements such as O shape circle, Yx shape circle then can produce distortion, medium passes through and mistake, seal failure simultaneously.So the pipe pressure height does not all need a rigid material ring set supporting element.Combined sealing component grows up on O shape circle, Yx shape circle class seal ring basis in recent years, combined sealing component is in fact with seal rings such as the O type circle of rigid material ring set support ring alienation and Yx types, the combined sealing component sealing mechanism encloses with O shape, Yx shape circle elastomeric material Sealing sealing mechanism is basically all the same, exist the dielectric leakage problem always, sealing effect is not very good yet, can not anti-very high pressure; With the Sealings such as O shape circle, Yx shape circle, the same same wild effect that can occur because of the generation of rigid material support ring; Existing oil hydraulic cylinder easily produces dielectric leakage, reliability, stable low, and operating life is short.Particularly when using two above combined sealing components simultaneously, be actually the quantity that has increased the rigid material support ring, require machining accuracy high, increased the manufacturing difficulty of processing of main frame, cause existing oil hydraulic cylinder cost significantly to rise.

The model utility content

The purpose of this utility model be exactly to provide a kind of dielectric leakage low, long service life and reliable operation, stable novel hydraulic cylinder.

Model utility thinking of the present utility model is:

The compound seal system that adopts n shape seal ring and combined sealing component to form between between the piston block of novel hydraulic cylinder and the cylinder body realizes sealing.

Concrete technological scheme of the present utility model is:

Be provided with at least one n shape seal ring and at least one combined sealing component on the hydraulic cylinder piston piece; The piston block end is provided with port hole in order to being communicated with n shape seal ring mounting groove, and port hole communicates with a plurality of n shape seal ring mounting grooves or a port hole communicates with a n shape seal ring seal ring mounting groove.The compound seal system that n shape seal ring, port hole and combined sealing component form realizes the piston block of oil hydraulic cylinder and the sealing between the casing wall.

Advantage of the present utility model and benefit:

The compound seal system that the utility model oil hydraulic cylinder has adopted n shape seal ring and combined sealing component to form, working medium pressure outwards expands from n shape seal ring inner chamber crush seal circle body and realizes sealing, more the high sealing effect is better for pressure, thereby can greatly reduce dielectric leakage, good sealing effect, long working life.N shape seal ring sealing mechanism is working medium pressure oneself dynamic balancing, adopt n shape seal ring not need to increase the cylinder machining accuracy, on the working condition of the combined sealing component in the compound seal system without any impact, so the utility model oil hydraulic cylinder has the double seal effect of n shape seal ring and combined sealing component.Compare the excellent characteristics such as have that dielectric leakage is low, good sealing effect, long working life, working condition are reliable, stable with existing oil hydraulic cylinder.

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Description of drawings:

Fig. 1, Fig. 2, Fig. 3 are the reciprocal two-way hydraulic cylinder cut-away views that adopts the compound seal system of n shape seal ring 5, port hole 4 and various combined sealing component 6 compositions;

Fig. 4 is the buffering hydraulic cylinder cut-away view that adopts the compound seal system of n shape seal ring 5, port hole 4 and combined sealing component 6 compositions;

Fig. 5 is the one-way hydraulic cylinder cut-away view that adopts the compound seal system of n shape seal ring 5, port hole 4 and combined sealing component 6 compositions;

Fig. 6 is the main cut-away view of n shape seal ring 5;

Fig. 7 is the side cut-away view of n shape seal ring 5;

Embodiment:

From Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, can find out, be provided with at least one n shape seal ring 5 mounting groove and at least one combined sealing component 6 mounting groove on the hydraulic cylinder piston piece 3, n shape seal ring 5, combined sealing component 6 just are installed in separately in the seal ring mounting groove; The end face of hydraulic cylinder piston piece 3 has some port holes 4 and each n shape seal ring peace 5 to put groove to be connected.Port hole 4 can share, and also can separate separately.

N shape seal ring 5 working surface inboards among Fig. 6, Fig. 7 and the both sides of seal ring consist of hollow cavity, and at least one boss 8 is arranged on the sealed working face of n shape seal ring 5, because n shape seal ring 5 sectional shapes are like n shape, so be called n shape seal ring.

From Fig. 1, Fig. 2, Fig. 3, can find out, back and forth two-way hydraulic cylinder piston block 3 has at least one n shape seal ring 5 mounting groove and at least one combined sealing component 6 mounting groove near two end faces, and n shape seal ring 5, combined sealing component 6 just are installed in separately in the seal ring mounting groove; The both ends of the surface of piston block 3 have some port holes 4 and lead to each road n shape seal ring 5 mounting groove, medium can be imported the inner chamber of n shape seal ring 5, make in the seal ring inner chamber to be full of medium.After oil hydraulic cylinder is started working, when pressure strengthens, pressure medium is reached the inner chamber of n shape seal ring 5 via port hole 4 by medium, make the working surface close contact of n shape seal ring 5 and cylinder body 2, boss 8 on n shape seal ring 5 working surfaces and the working surface close contact of cylinder body 2 form labyrinth seal, medium by the time pressure progressively decay, less than the pressure medium in the inner chamber of n shape seal ring 5, medium can not occur pass through leakage phenomenon, obtain fabulous sealing effect.And pressure medium is larger, and the working surface of n shape seal ring 5 sealed working faces and cylinder body 2 is fitted tighter, and sealing effect is fine.Since n shape seal ring 5 inner chamber hollows, wearing and tearing and little in the working stroke; And in the inoperative stroke, it is slight to rub between sealing circle body and the cylinder body 2, and it is very little to wear and tear.Simultaneously, pressure medium is to push internally n shape seal ring 5 sealing circle bodies to realize sealing, whole rubber seal uniform stressed under the extruding of pressure medium, and deformation is very little, can not produce permanent set, and n shape seal ring 5 operating lives have obtained prolongation.Because sealing force directly comes from working medium pressure in n shape seal ring 5 inner chambers, so the working medium pressure in n shape seal ring 5 inner chambers is in self-dynamic balancing at any time during host work, do not affect the working condition of combined sealing component 6 in the compound seal system, realized double seal.The utility model oil hydraulic cylinder not only operating life is multiplied, and dielectric leakage is low, and, good stability more reliable than existing hydraulic cylinder works.

Buffering hydraulic cylinder among Fig. 4, piston also are two way sealeds, can use separately, also can be as the cylinder part of hydraulic bjuffer.Reciprocal two-way hydraulic cylinder among its working condition, structure and Fig. 1, Fig. 2, Fig. 3 is identical, because the compound seal system that adopts n shape seal ring 5, port hole 4 and combined sealing component 6 to form has realized double seal.Compare with existing buffering hydraulic cylinder, hydraulic bjuffer, the utility model buffering hydraulic cylinder has long working life, and dielectric leakage is low, the excellent characteristics such as reliable operation, good stability.

Novel one-way hydraulic cylinder is one-way sealing among Fig. 5, also is provided with Returnning spring 7 in the cylinder body, is usually used in the hydraulic cylinder part of the equipment such as Manual hydraulic cutter, hydraulic pressure draw-bar.Different with the reciprocal two-way hydraulic cylinder among Fig. 1, Fig. 2, Fig. 3 on the structure, hydraulic cylinder piston piece 3 has at least one n shape seal ring 5 mounting groove and at least one combined sealing component 6 mounting groove near working medium one end ends, and n shape seal ring 5, combined sealing component 6 just are installed in separately in the seal ring mounting groove.The close working medium one end end face of piston block 3 has some port holes 4 and leads to each road n shape seal ring 5 mounting groove, medium can be imported the inner chamber of n shape seal ring 5, makes in n shape seal ring 5 inner chambers to be full of medium.When working pressure strengthens, pressure medium is reached the inner chamber of n shape seal ring via port hole 4 by medium, make the working surface close contact of n shape seal ring 5 and cylinder body 2, boss 8 on the working surface of n shape seal ring 5 and the working surface close contact of cylinder body 2 form labyrinth seal, medium by the time pressure progressively decay, less than the pressure medium in the inner chamber of n shape seal ring 5, medium can not occur pass through leakage phenomenon, obtain fabulous sealing effect.And pressure medium is larger, and the sealed working face of n shape seal ring 5 working surfaces and cylinder body 2 is fitted tighter, and sealing effect is fine.Because the compound seal system that adopts n shape seal ring 5, port hole 4 and combined sealing component 6 to form, realized double seal, compare with existing Manual hydraulic cutter, hydraulic pressure draw-bar, the one-way hydraulic cylinder is made Manual hydraulic cutter, the hydraulic pressure draw-bar long working life of cylinder body in employing the utility model, dielectric leakage is low, reliable operation, good stability.

Industrial application

Because the compound seal system that the utility model novel hydraulic cylinder has adopted n shape seal ring 5, port hole 4 and combined sealing component 6 to form, greatly reduce dielectric leakage, obtain good sealing effect, long working life has the good technology capability such as reliable, stable.This clearly demarcated oil hydraulic cylinder is compared with existing oil hydraulic cylinder, has that dielectric leakage is low, good sealing effect, long working life and reliable operation, excellent characteristics such as stable.

Claims

1. oil hydraulic cylinder, by formations such as piston block (3), cylinder body (2), piston rod (1), n shape seal ring (5), combined sealing components (6), it is characterized in that: the compound seal system that sealing adopts n shape seal ring (5), port hole (4) and combined sealing component (6) to form between piston block (3) and the cylinder body (2) realizes.

2. oil hydraulic cylinder according to claim 1, it is characterized in that: at least one n shape seal ring (5) and at least one combined sealing component (6) are arranged on the piston block (3), and piston block (3) end is provided with port hole (4) in order to be communicated with n shape seal ring (5) mounting groove.