CN214036329U

CN214036329U - Hydraulic cylinder prevents leaking device

Info

Publication number: CN214036329U
Application number: CN202022575771.7U
Authority: CN
Inventors: 沈宏伟
Original assignee: Wuxi Laike Hydraulic Machinery Co ltd
Current assignee: Wuxi Laike Hydraulic Machinery Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-08-24
Anticipated expiration: 2030-11-10

Abstract

The utility model discloses a hydraulic cylinder leakage-proof device, which comprises a cylinder barrel, a cylinder cover, a piston rod, a piston, an oil inlet, an oil outlet and a guide sleeve, wherein the piston is arranged in the cylinder barrel, the piston rod penetrates through the axle center of the upper surfaces of the cylinder cover and the guide sleeve and extends to the inside of the cylinder barrel to be fixedly connected with the piston, the outer surface of the piston is provided with a first groove, the piston is in sliding connection with the inner wall of the cylinder barrel through a first O-shaped sealing ring arranged in the first groove, one end of the guide sleeve is provided with a second groove, the guide sleeve is in clearance fit with the inner wall of the cylinder barrel through a second O-shaped sealing ring arranged in the second groove, one side surface of the guide sleeve, which is close to the piston rod, is provided with a first annular groove and a second annular groove from left to right in sequence, the utility model has simple structure and good sealing performance, and is provided with an elastic sealing component, the anti-extrusion performance of the sealing ring is improved, the sealing effect of the sealing ring is enhanced, and the service life is prolonged.

Description

Hydraulic cylinder prevents leaking device

Technical Field

The utility model relates to an hydro-cylinder technical field specifically is a hydraulic cylinder prevents leaking device.

Background

The hydraulic cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and does linear reciprocating motion (or swinging motion), has simple structure and reliable work, can eliminate a speed reducer when the hydraulic actuating element is used for realizing reciprocating motion, has no transmission clearance and moves stably, thereby being widely applied to hydraulic systems of various machines, the hydraulic cylinder basically comprises a cylinder barrel and a cylinder cover, a piston and a piston rod, a sealing device, a buffer device and an exhaust device, the buffer device and the exhaust device are determined according to specific application occasions, other devices are indispensable, the piston rod is used as an energy conversion component which can convert hydraulic pressure into mechanical energy, therefore, the sealing performance in the piston rod directly influences the energy conversion efficiency of the piston rod, in the process of the frequent and quick opening and closing of the piston rod, the continuous friction on the inner wall of the cylinder barrel causes the increase of a gap between the piston rod and the cylinder barrel, finally, oil leakage occurs, so that the working efficiency of the hydraulic oil cylinder is reduced, and even the hydraulic oil cylinder cannot work. Therefore, the leakage-proof device for the hydraulic oil cylinder is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hydraulic cylinder prevents leaking device to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a leakage-proof device of a hydraulic oil cylinder comprises a cylinder barrel, a cylinder cover, a piston rod, a piston, an oil inlet, an oil outlet and a guide sleeve, wherein the piston is arranged in the cylinder barrel, the piston rod penetrates through the axis of the upper surfaces of the cylinder cover and the guide sleeve and extends to the inside of the cylinder barrel to be fixedly connected with the piston, a first groove is formed in the outer surface of the piston, the piston is in sliding connection with the inner wall of the cylinder barrel through a first O-shaped sealing ring arranged in the first groove, the guide sleeve is arranged at the joint of the piston rod and the cylinder cover and is convex, one end of the guide sleeve is inserted in the cylinder cover, a second groove is formed in the other end of the guide sleeve, the guide sleeve is in clearance fit with the inner wall of the cylinder barrel through a second O-shaped sealing ring arranged in the second groove, a first annular groove and a second annular groove are sequentially formed in a side surface, close to the piston rod, from left to right, the inside of first ring channel is provided with flexible seal assembly, the internally mounted of second ring channel has the steckel, peg graft in the inside of cylinder and pass through bolt fixed connection in the bottom of cylinder cap, the third ring channel has been seted up to the handing-over department of cylinder cap and piston rod, the inside of third ring channel is provided with dustproof sealing washer.

Preferably, the elastic sealing assembly comprises a sealing ring, U-shaped encryption grooves are formed in the left side and the right side of the sealing ring, U-shaped clamp springs are arranged in the U-shaped encryption grooves, the U-shaped clamp springs are fixedly connected with the sealing ring through anti-falling hook portions arranged at the two ends of the opening of the U-shaped encryption grooves, and a plurality of axially arranged first springs are fixedly connected to the inner portions of the U-shaped clamp springs.

Preferably, the first spring is in a compressed state in a natural state.

Preferably, the outer surface of the U-shaped clamp spring is attached to the inner side wall of the U-shaped encryption groove.

Preferably, the sealing ring is divided into an upper lip part far away from the outer surface of the piston rod and a lower lip part close to the outer surface of the piston rod by the U-shaped encryption groove, the outer surface of the upper lip part is respectively attached to the top and the left and right side surfaces of the inner wall of the first annular groove, and the lower surface of the lower lip part extends to the outside of the U-shaped encryption groove.

Preferably, the thickness of the lower lip is greater than that of the upper lip, and gaps are reserved between the left side surface and the right side surface of the lower lip and the left side surface and the right side surface of the inner wall of the first annular groove.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses simple structure, sealing performance is good, through having set up the elastic sealing subassembly, utilizes the ability of bending of U type jump ring self to extrude the sealing ring, again under the compression of first spring, has improved the anti extrudability of sealing ring, strengthens the sealed effect of sealing ring, can prevent to carry out the leakage of the hydraulic oil that takes place in quick reciprocal function at the piston rod, has prolonged life, through the dustproof sealing circle that sets up, avoids the invasion of dust, foreign matter to cause the damage of equipment.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic sectional view of the overall structure of the present invention;

FIG. 3 is an enlarged view of area A of FIG. 2;

fig. 4 is a schematic structural view of the cylinder cover of the present invention;

fig. 5 is a schematic structural view of the guide sleeve of the present invention;

fig. 6 is a schematic structural diagram of the piston rod of the present invention.

In the figure: 1-a cylinder barrel; 2-cylinder cover; 3-a piston rod; 4-a piston; 5-an oil inlet; 6-oil outlet; 7-a guide sleeve; 8-a first groove; 9-a first O-ring seal; 10-a second groove; 11-a second O-ring seal; 12-a first annular groove; 13-a second annular groove; 14-a resilient seal assembly; 15-steckel; 16-a third annular groove; 17-dustproof sealing ring; 18-a sealing ring; 19-U type encryption groove; 20-U-shaped clamp springs; 21-an anti-drop hook part; 22-a first spring; 23-an upper lip; 24-lower lip.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a hydraulic cylinder leakage-proof device comprises a cylinder barrel 1, a cylinder cover 2, a piston rod 3, a piston 4, an oil inlet 5, an oil outlet 6 and a guide sleeve 7, wherein the piston 4 is arranged inside the cylinder barrel 1, the piston rod 3 penetrates through the axle center of the upper surfaces of the cylinder cover 2 and the guide sleeve 7 and extends to the inside of the cylinder barrel 1 to be fixedly connected with the piston 4, a first groove 8 is formed in the outer surface of the piston 4, the piston 4 is in sliding connection with the inner wall of the cylinder barrel 1 through a first O-shaped sealing ring 9 arranged inside the first groove 8, the guide sleeve 7 is arranged at the joint of the piston rod 3 and the cylinder cover 2, the guide sleeve 7 is convex, one end of the guide sleeve 7 is inserted into the inside of the cylinder cover 2, a second groove 10 is formed in the other end of the guide sleeve 7, and the guide sleeve 7 is in clearance fit with the inner wall of the cylinder barrel 1 through a second O-shaped sealing ring 11 arranged inside the second groove 10, so that the side surface of the guide sleeve 7 is attached to the inner wall of the cylinder barrel 1 to form sealing, thereby preventing hydraulic oil inside the cylinder barrel 1 from overflowing, a first annular groove 12 and a second annular groove 13 are sequentially formed in the side surface of the guide sleeve 7, which is close to the piston rod 3, from left to right, an elastic sealing assembly 14 is arranged inside the first annular groove 12 for primary sealing, a steckel seal 15 is arranged inside the second annular groove 13 for secondary sealing, when the piston rod 3 reciprocates in the cylinder barrel 1, the hydraulic oil in the inner cavity of the cylinder barrel 1 can move along with the movement of the piston rod 1 to seal the piston rod 3 for multiple times, in order to prevent the hydraulic oil from overflowing from a gap of the cylinder barrel 1 and causing harm, the bottom of the cylinder cover 2 is inserted into the cylinder barrel 1 and fixedly connected through a bolt, a third annular groove 16 is formed at the joint of the cylinder cover 2 and the piston rod 3, the inside of the third annular groove 16 is provided with a dustproof sealing ring 17, so that foreign objects are prevented from entering the cylinder barrel 1 and polluting hydraulic oil in the cylinder barrel 1.

The elastic sealing assembly 14 comprises a sealing ring 18, U-shaped encryption grooves 19 are formed in the left side and the right side of the sealing ring 18, U-shaped clamp springs 20 are arranged in the U-shaped encryption grooves 19, a plurality of first springs 22 which are axially arranged are fixedly connected in the U-shaped clamp springs 20, the U-shaped clamp springs 20 are enabled to extrude the sealing ring 18 by utilizing the high-strength bending capacity of the U-shaped clamp springs 20 and the elastic capacity of restoring the initial efficiency, the sealing effect is enhanced, and then the sealing ring 18 can maximally complete the sealing effect under the action of the elastic capacity of the first springs 22.

The seal ring 18 is divided into an upper lip 23 far away from the outer surface of the piston rod 3 and a lower lip 24 close to the outer surface of the piston rod 3 by the U-shaped encryption groove 19, the outer surface of the upper lip 23 is respectively attached to the top and the left and right sides of the inner wall of the first annular groove 12, the lower surface of the lower lip 24 extends to the outside of the U-shaped encryption groove 19, the thickness of the lower lip 24 is larger than that of the upper lip 23, the wear-resisting service life is prolonged, gaps are reserved on the left and right sides of the lower lip 24 and the left and right sides of the inner wall of the first annular groove 12, and hydraulic oil flowing out along the piston rod 3 flows into the cavity of the U-shaped encryption groove 19.

The working principle is as follows: when hydraulic cylinder carries out the during operation, transmit power through the inside hydraulic oil of cylinder 1, make piston rod 3 make reciprocating motion in cylinder 1, piston rod 3 produces the friction and extrudees to uide bushing 7 at the during operation, through the sealing ring 18 that sets up, make piston rod 3's effort transfer to on the sealing ring 18, first spring 22 utilizes its elasticity performance extrusion U type jump ring 20, U type jump ring 20 extrudees last lip 23, make it laminate in the inner wall of first ring channel 12, thereby form encapsulated situation, U type jump ring 20 is down on acting lower lip 24 simultaneously, and extrude it, make its laminate in the surface of piston rod 3, reduce the gap between uide bushing 7 and the piston rod 3, hydraulic oil has been prevented to flow out from cylinder 1.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a hydraulic cylinder prevents leaking device, includes cylinder (1), cylinder cap (2), piston rod (3), piston (4), oil inlet (5) and oil-out (6), uide bushing (7), piston (4) set up in the inside of cylinder (1), piston rod (3) run through the axle center department of the upper surface of cylinder cap (2) and uide bushing (7) and extend to inside and piston (4) fixed connection of cylinder (1), its characterized in that: the outer surface of the piston (4) is provided with a first groove (8), the piston (4) is in sliding connection with the inner wall of the cylinder barrel (1) through a first O-shaped sealing ring (9) arranged inside the first groove (8), a guide sleeve (7) is arranged at the joint of the piston rod (3) and the cylinder cover (2), the guide sleeve (7) is convex, one end of the guide sleeve (7) is inserted into the cylinder cover (2), the other end of the guide sleeve (7) is provided with a second groove (10), the guide sleeve (7) is in clearance fit with the inner wall of the cylinder barrel (1) through a second O-shaped sealing ring (11) arranged inside the second groove (10), a first annular groove (12) and a second annular groove (13) are sequentially formed from one side face, close to the piston rod (3), of the guide sleeve (7), an elastic sealing component (14) is arranged inside the first annular groove (12), the inside mounting of second ring channel (13) has the steckel seal (15), peg graft in the inside of cylinder (1) and pass through bolt fixed connection the bottom of cylinder cap (2), third ring channel (16) have been seted up in the handing-over department of cylinder cap (2) and piston rod (3), the inside of third ring channel (16) is provided with dust seal (17).

2. A leak-proof device for a hydraulic cylinder according to claim 1, characterized in that: elastic seal subassembly (14) include sealing ring (18), U type encryption groove (19) have been seted up to the left and right sides of sealing ring (18), the inside in U type encryption groove (19) is provided with U type jump ring (20), U type jump ring (20) are through setting up anticreep hook portion (21) and sealing ring (18) fixed connection at the both ends of the opening part in U type encryption groove (19), first spring (22) that a plurality of axial settings of inside fixedly connected with of U type jump ring (20).

3. A leak-proof device for a hydraulic cylinder according to claim 2, characterized in that: the first spring (22) is in a compressed state in a natural state.

4. A leak-proof device for a hydraulic cylinder according to claim 2, characterized in that: the outer surface of the U-shaped clamp spring (20) is attached to the inner side wall of the U-shaped encryption groove (19).

5. A leak-proof device for a hydraulic cylinder according to claim 2, characterized in that: the seal ring (18) is divided into an upper lip (23) far away from the outer surface of the piston rod (3) and a lower lip (24) close to the outer surface of the piston rod (3) by the U-shaped encryption groove (19), the outer surface of the upper lip (23) is respectively attached to the top and the left and right sides of the inner wall of the first annular groove (12), and the lower surface of the lower lip (24) extends to the outside of the U-shaped encryption groove (19).

6. A leak-proof device for a hydraulic cylinder according to claim 5, characterized in that: the thickness of the lower lip (24) is larger than that of the upper lip (23), and gaps are reserved between the left side surface and the right side surface of the lower lip (24) and the left side surface and the right side surface of the inner wall of the first annular groove (12).