CN201606335U

CN201606335U - Novel hydraulic cylinder

Info

Publication number: CN201606335U
Application number: CN2009201080760U
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: 2009-05-26
Filing date: 2009-05-26
Publication date: 2010-10-13
Anticipated expiration: 2019-05-26

Abstract

The utility model relates to a novel hydraulic cylinder which has the advantages of high pressure resistance, no medium leakage, long service life and lower cost. A novel sealing technique in which medium pressure presses hollow sealing rings (5, 6) from cavities (7, 8) of the sealing rings (5, 6) so that the sealing rings (5, 6) cling to a cylinder body (10) and a piston rod (11) to carry out sealing is adopted at a piston (1) and an end cover (2) of the hydraulic cylinder. The higher the medium pressure is, the mote tightly the sealing surfaces of the n-shaped sealing rings (5, 6) cling to the sealing surfaces of the cylinder body (10) and the piston rod (11), so the sealing effect is good. Since the cavities of the n-shaped sealing rings are hollow, abrasion is low in the process of operation; and during non-operating travel, the abrasion of the sealing rings is lower. Meanwhile, since the medium pressure presses the sealing rings from the inside to carry out sealing, under the pressing of the medium pressure, the whole rubber sealing rings are uniformly stressed, deformation is little, permanent deformation cannot occur, and thereby the service lives of the sealing elements are prolonged.

Description

A kind of novel 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 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.

The model utility content

The purpose of this utility model 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.

Invention thinking of the present utility model is:

Adopt pressure medium to make it be adjacent to cylinder body 10 and piston rod 11 and realize sealing between the piston block 1 of novel 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 n shape seal ring 5,6.

Concrete technological scheme of the present utility model is:

1) groove 3 of some is arranged on piston block 1, end cap 2 column working, it is fixed that quantity requires according to technology capability; 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) both sides of the working surface inboard of 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; 4) on the sealed working face of n shape seal ring 5,6 boss 9 is arranged, boss 9 quantity are decided according to service behaviours such as the pressure of usage requirement and technical parameter; 5) 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.6) according to the technology capability requirement, hydraulic cylinder piston piece 1 and cylinder body 10, end cap 2 and piston rod 11 can adopt n shape seal ring sealing technique simultaneously, and also wherein a place adopts n shape seal ring sealing technique, and another place adopts other sealing techniquies.

Advantage of the present utility model and benefit:

Because the utility model oil hydraulic cylinder has adopted n shape seal ring sealing technique, working medium pressure outwards expands from n shape seal ring inner chamber crush seal circle body and realizes sealing, pressure high sealing effect more is good more, thereby can be high pressure resistant, reduce dielectric leakage greatly, obtain better sealing effect, further prolonged operating life.Compare with existing oil hydraulic cylinder, have withstand voltage, good sealing effect, excellent characteristics such as leakage is little, the life-span is long, working condition is stable, cost is low.

The invention will be further described below in conjunction with the drawings and specific embodiments.

Description of drawings

Fig. 1 is the cut-away view that adopts the novel hydraulic cylinder of n shape seal ring sealing technique

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

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

Fig. 4 is the main cut-away view of hole with n shape seal ring

Fig. 5 is the side cut-away view of hole with n shape seal ring

Embodiment

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, Fig. 3 is with having boss 9 on n shape seal ring 5 its sealed working faces, and boss 9 quantity are decided according to the service behaviour and the technical parameter of usage requirement.

Hole among Fig. 4, Fig. 5 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.

Be characterized in:

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.The utility model oil hydraulic cylinder 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.

Industrial application

Because the utility model hydraulic cylinder has adopted n shape sealing ring Sealing Technology, pressure medium is that the crush seal circle body is realized sealing internally, can bear high pressure, reduces dielectric leakage, can obtain better sealing effectiveness, long working life. Compare with existing hydraulic cylinder, have that withstand voltage, good sealing effect, leakage are little, excellent characteristics such as long working life and production cost are low.

Claims

1. novel hydraulic cylinder is characterized in that: adopt working medium pressure to make it be adjacent to cylinder body (10) and piston rod (11) and realize sealing from inner chamber (7), (8) crush seal circle body of n shape seal ring (5), (6) between piston block (1) and cylinder body (10), end cap (2) and the piston rod (11).

2. novel hydraulic cylinder according to claim 1 is characterized in that: on piston block (1), end cap (2) column working groove (3) is arranged.

3. novel hydraulic cylinder according to claim 1 is characterized in that: have the seal ring mounting groove on piston block (1), end cap (2) column working.

4. novel hydraulic cylinder according to claim 1 is characterized in that: n shape seal ring (5), (6) are installed in the seal ring mounting groove.

5. novel hydraulic cylinder according to claim 1 is characterized in that: the working surface of n shape seal ring (5), (6) both sides inboard and seal ring constitute hollow cavity (7), (8), have boss (9) on the sealed working face of seal ring.

6. novel hydraulic cylinder according to claim 1 is characterized in that: 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, and port hole (4) is shared or separately independent.