CN215214188U

CN215214188U - Extremely low internal leakage combined seal structure

Info

Publication number: CN215214188U
Application number: CN202121693783.8U
Authority: CN
Inventors: 李鹏博; 马军杰
Original assignee: Xuzhou XCMG Hydraulics Co Ltd
Current assignee: Xuzhou XCMG Hydraulics Co Ltd
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2021-12-17
Anticipated expiration: 2031-07-23

Abstract

The utility model discloses an extremely low interior discharge combined seal structure belongs to fluid seal technical field. The piston is arranged at the end part of the piston rod, and the circumferential surface of the piston is in sliding fit with the inner wall of the cylinder barrel; a groove II and a groove III are formed in the outer circumferential surface of the piston, and the groove II is located on one side, close to the inner end of the piston rod, of the groove III; a Y ring and a check ring I are arranged in the groove II; a combined seal is arranged in the groove III; two grooves IV are formed in the inner hole wall of the piston, and an O ring and two check rings II are arranged in the grooves IV. In the utility model, the Y ring and the retainer ring I have good shock resistance; the groove III is matched with the GZC combined seal, so that the bidirectional shock resistance is good, the prepressing is reduced, and the phenomena of clamping stagnation, abnormal sound and the like are not easy to occur; the static seal is of a structure of two retainer rings II + O ring + retainer ring II, so that the O ring is protected from being extruded and damaged, and the internal leakage risk is reduced.

Description

Extremely low internal leakage combined seal structure

Technical Field

The utility model relates to a fluid seal technical field specifically is an extremely low internal leakage combined seal structure.

Background

The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion or swinging motion. Internal leakage refers to the phenomenon that the large cavity and the small cavity inside the hydraulic cylinder are communicated with each other, and is called internal leakage. The internal leakage quantity at the piston of the hydraulic cylinder in the industry at present is generally required to be lower than 0.45 mL/min. For a vertical cylinder, the requirement of the vertical cylinder is to have a better pressure maintaining function and lower internal leakage amount.

The existing piston dynamic seal is generally used by matching two main seals, although the risk of internal leakage can be effectively reduced, the phenomenon of clamping stagnation of an oil cylinder can occur due to undersized clearance fit. In addition, the O-ring seal at the static seal is easily squeezed out and damaged under high pressure, resulting in increased internal leakage.

Disclosure of Invention

In order to solve the technical problem, the utility model provides an extremely low internal leakage combined seal structure.

The utility model discloses a following technical scheme realizes: a combined sealing structure with extremely low internal leakage is characterized in that a piston is arranged at the end part of a piston rod, and the circumferential surface of the piston is in sliding fit with the inner wall of a cylinder barrel; a groove II and a groove III are formed in the outer circumferential surface of the piston, and the groove II is located on one side, close to the inner end of the piston rod, of the groove III; a Y ring and a check ring I are arranged in the groove II; a combined seal is arranged in the groove III; two grooves IV are formed in the inner hole wall of the piston, and an O ring and two check rings II are arranged in the grooves IV.

It further comprises the following steps: two grooves I are formed in the outer circumferential surface of the piston and are respectively arranged at the positions close to the two ends of the piston, and supporting rings are arranged in the grooves I.

The check ring I is positioned on one side of the Y ring close to the rod cavity.

The two retainer rings II are respectively arranged on two sides of the O ring.

The piston is provided with a step inner hole, and the inner end of the piston rod is a step shaft; the small-diameter step inner hole of the piston is connected with the small-diameter step of the piston rod through threads, and the O ring and the check ring II are arranged between the large-diameter step inner hole of the piston and the large-diameter step of the piston rod.

The piston is fixedly connected with the inner end of the piston rod through a set screw.

And two sides of the piston groove III are provided with sinking grooves.

The combined seal adopts GZC combined seal.

Compared with the prior art, the beneficial effects of the utility model are that: the Y ring and the check ring I have good shock resistance; the groove III is matched with the GZC combined seal, so that the bidirectional shock resistance is good, the prepressing is reduced, and the phenomena of clamping stagnation, abnormal sound and the like are not easy to occur; the static seal is of a structure of two retainer rings II + O ring + retainer ring II, so that the O ring is protected from being extruded and damaged, and the internal leakage risk is reduced.

Drawings

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

in the figure: 1. y circles; 2. a check ring I; 3. combining and sealing; 4. an O ring; 5. a retainer ring II; 6. a piston; 7. a piston rod; 8. a cylinder barrel; 9. a supporting ring; 10. and (5) tightening the screw.

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.

As shown in figure 1, a combined sealing structure with extremely low internal leakage is characterized in that a piston 6 is arranged at the end part of a piston rod 7, and the circumferential surface of the piston 6 is in sliding fit with the inner wall of a cylinder 8. The piston 6 is provided with a step inner hole, the inner end of the piston rod 7 is a step shaft, the small-diameter step inner hole of the piston 6 is in threaded connection with the small-diameter step of the piston rod 7, and the piston 6 is fixedly connected with the inner end of the piston rod 7 through a set screw 10.

The large-diameter step inner hole of the piston 6 is matched with the large-diameter step of the piston rod 7 in a stepped mode, two grooves IV are formed in the wall of the large-diameter step inner hole of the piston 6, each groove is provided with 1O ring 4 and two retaining rings II 5, and the retaining rings II 5 are arranged on two sides of the O ring 4. In this embodiment, the static seal is two retaining rings II + O circle + retaining ring II structures, and it can not extruded, impaired to respectively have a retaining ring about this structure can effectively guarantee O circle, and the risk of leaking in the two seals can effectively be reduced.

A first groove I, a groove II, a groove III and a second groove I are sequentially formed in the outer circumferential surface of the piston 6. The groove I is divided at the two ends of the piston 6, and a supporting ring 9 is arranged in the groove I. Install Y circle 1 and retaining ring I2 in the slot II, retaining ring I2 is located Y circle 1 and is close to the one side that has the pole chamber. Heavy grooves are formed in two sides of a groove III of the piston 6, a combined seal 3 is installed in the groove III, and the combined seal 3 is a GZC combined seal. In the embodiment, the dynamic seal comprises two supporting rings at two sides, and a Y ring at the middle part is combined with a check ring I and a GZC seal. In the Y circle and retaining ring I's integrated configuration, the Y circle possess fine wearability, impact resistance and compression deformation volume is less, increases a retaining ring I behind and can effectively prevent the extrusion of Y circle. The GZC combined seal can ensure the bidirectional shock resistance, and the combined seal is not large in pre-compression, so that the phenomena of clamping stagnation, abnormal sound and the like are not easy to occur. The combined sealing configuration of static seal and dynamic seal can ensure that the internal leakage of the vertical oil cylinder is reduced to below 0.25mL/min under the normal working condition.

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. A combined sealing structure with extremely low internal leakage is characterized in that a piston (6) is arranged at the end part of a piston rod (7), and the circumferential surface of the piston (6) is in sliding fit with the inner wall of a cylinder barrel (8); the method is characterized in that: a groove II and a groove III are formed in the outer circumferential surface of the piston (6), and the groove II is located on one side, close to the inner end of the piston rod (7), of the groove III; a Y ring (1) and a check ring I (2) are arranged in the groove II; a combined seal (3) is arranged in the groove III; two grooves IV are formed in the inner hole wall of the piston (6), and an O ring (4) and two check rings II (5) are installed in the grooves IV.

2. A very low rate of internal leakage composite seal structure according to claim 1, wherein: two grooves I are formed in the outer circumferential surface of the piston (6) and are respectively arranged at the positions close to the two ends of the piston (6), and a supporting ring (9) is arranged in each groove I.

3. A very low rate of internal leakage composite seal structure according to claim 1, wherein: the check ring I (2) is positioned on one side of the Y ring (1) close to the rod cavity.

4. A very low rate of internal leakage composite seal structure according to claim 1, wherein: the two check rings II (5) are respectively arranged on two sides of the O ring (4).

5. A very low rate of internal leakage composite seal structure according to claim 1, wherein: the piston (6) is provided with a step inner hole, and the inner end of the piston rod (7) is a step shaft; the small-diameter step inner hole of the piston (6) is connected with the small-diameter step of the piston rod (7) through threads, and the O ring (4) and the check ring II (5) are installed between the large-diameter step inner hole of the piston (6) and the large-diameter step of the piston rod (7).

6. A very low rate of internal leakage composite seal structure according to claim 1, wherein: the piston (6) is fixedly connected with the inner end of the piston rod (7) through a set screw (10).

7. A very low rate of internal leakage composite seal structure according to claim 1, wherein: two sides of the groove III of the piston (6) are provided with sinking grooves.

8. A very low rate of internal leakage composite seal structure according to claim 1, wherein: and the combined seal (3) adopts GZC combined seal.