CN219061933U

CN219061933U - Piston air compressor and piston ring thereof

Info

Publication number: CN219061933U
Application number: CN202223430384.XU
Authority: CN
Inventors: 甘文军
Original assignee: Beijing Jiaqian Technology Co ltd
Current assignee: Beijing Jiaqian Technology Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-05-23
Anticipated expiration: 2032-12-21

Abstract

The application discloses piston air compressor machine and be used for piston ring of this air compressor machine, this piston ring includes: an annular portion including a ring body having a first end and a second end disconnected from each other in a natural state; the annular portion has a compressed state when the ring body is subjected to radially inward pressure, in which the first end and the second end are brought close to each other so that a projected shape of the ring body, the first end, and the second end in a thickness direction is a closed annular shape. According to the technical scheme of the application, the sealing reliability of the piston and the inner wall of the cylinder body is improved, so that the service life of the piston air compressor is prolonged.

Description

Piston air compressor and piston ring thereof

Technical Field

The present application relates to the field of air compression, and more particularly, to a piston air compressor and a piston ring for the air compressor.

Background

The positive displacement air compressor directly relies on changing the gas volume to increase the gas pressure, and as one of the positive displacement air compressors, the main compression element of the piston air compressor is a piston, and the piston reciprocates in a cylinder to change the gas volume. Therefore, the tightness of the piston and the inner wall of the cylinder body directly influences the working performance of the air compressor. In practical use, whether the piston can keep reliable sealing performance with the inner wall of the cylinder body for a long time is also an important factor influencing the service life of the piston air compressor.

Therefore, how to improve the service life of the piston air compressor is a technical problem to be solved in the field.

Disclosure of Invention

In view of this, this application has proposed a piston air compressor machine and be used for this air compressor machine's piston ring to through improving the sealing reliability of piston and cylinder body inner wall, thereby improve piston air compressor machine's life.

According to the present application, a piston ring is proposed, comprising: an annular portion including a ring body having a first end and a second end disconnected from each other in a natural state; the annular portion has a compressed state when the ring body is subjected to radially inward pressure, in which the first end and the second end are brought close to each other so that a projected shape of the ring body, the first end, and the second end in a thickness direction is a closed annular shape.

Preferably, the ring body is an elastomer.

Preferably, the annular portion includes an elastic member fixed to the ring body to provide an elastic force for maintaining the annular portion in the natural state.

Preferably, the elastic member is a C-shaped spring extending along the ring body.

Preferably, the inner circumferential surface of the ring body is provided with a mounting groove, and the elastic piece is arranged in the mounting groove and does not protrude out of the inner circumferential surface of the ring body.

Preferably, the ring body is a polytetrafluoroethylene complex.

Preferably, the first end and the second end are respectively wedge-shaped with complementary shapes.

Preferably, the first end is formed with a first overlap section and the second end is formed with a second overlap section; in the thickness direction of the piston ring, the projections of at least a part of the first overlap section and the second overlap section coincide.

Preferably, the first overlap section and the second overlap section are respectively of a step structure capable of being matched with each other; or the first overlap section is a convex pin protruding from the first end, and the second overlap section is a concave groove arranged at the second end.

The application also provides a piston air compressor comprising the piston ring.

According to the technical scheme of the application, when the piston ring is in the cylinder body of the piston air compressor, the piston ring is radially restrained by the inner wall of the cylinder body, so that the piston ring is in a compressed state. The piston ring always adheres to the inner wall of the cylinder body due to the tendency of the ring portion thereof from a compressed state to a natural state. When the piston air compressor is used for a long time, the outer peripheral surface of the piston ring is worn, the piston ring can automatically compensate the gap between the piston ring and the inner wall of the cylinder body, so that the sealing reliability of the piston and the inner wall of the cylinder body is maintained, and the service life of the piston air compressor is prolonged.

Additional features and advantages of the present application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a perspective view of a piston ring according to a preferred embodiment of the present application;

FIG. 2 is a perspective view of the piston ring of FIG. 1 from another perspective;

fig. 3 is a schematic side view of a piston ring.

Detailed Description

The piston ring is used as a key part of the piston air compressor, is arranged in an annular groove of a piston of the air compressor, and forms effective volume seal with the inner wall of the cylinder body. The piston ring of the traditional piston air compressor cannot form effective sealing with the inner wall of the cylinder after being worn, so that the exhaust gas quantity of the air compressor is reduced, and the air compressor is short in service life and high in maintenance cost. Through improving the sealing reliability of piston and cylinder body inner wall, this application provides a can improve piston air compressor machine's life's piston ring.

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in combination with embodiments.

As shown in fig. 1 and 2, the piston ring of the present application includes a ring portion and an opening portion broken at the ring portion, the ring portion including a ring body 11, the ring body 11 having a first end 12 and a second end 13 broken from each other in a natural state, the broken first end 12 and second end 13 forming the opening portion of the piston ring therebetween. Wherein the annular portion has a compressed state when the ring body 11 is subjected to radially inward pressure, and in the compressed state, the first end 12 and the second end 13 are brought close to each other so that a projected shape of the ring body 11, the first end 12, and the second end 13 in the thickness direction is a closed annular shape. Conversely, when the ring body 11 is not affected by the radially inward pressure, the annular portion returns to the natural state from the compressed state, so that the first end 12 and the second end 13 are away from each other, and the projected shapes of the ring body 11, the first end 12, and the second end 13 in the thickness direction may be still annular or may be C-shaped.

According to the scheme, the piston ring is arranged in the annular groove of the piston of the air compressor, and the outer peripheral surface of the piston ring is attached to the inner wall of the cylinder body so as to form effective volume seal with the inner wall of the cylinder body. The piston ring has a margin of deformation between a compressed state and a natural state due to the existence of an opening portion of the piston ring. In actual use, the piston ring is constrained by the annular groove of the piston in the axial direction of the cylinder to move with the movement of the piston, while the piston ring is mainly constrained by the radial direction of the inner wall of the cylinder in the radial direction of the piston ring, so that the piston ring is in a compressed state. After long-time working, the outer peripheral surface of the piston ring is worn by the inner wall of the cylinder body, and the annular part is self-expanded to make up the gap between the piston ring and the inner wall of the cylinder body, so that the volume sealing performance is ensured. Therefore, according to the technical scheme, under the condition that the piston ring is subjected to smaller abrasion, the influence of abrasion on the volume sealing performance can be reduced through self-compensation of the piston ring, and the service life of the piston air compressor is further prolonged.

The force of the annular part of the piston ring against the radially inward pressure can come from the ring body 11 itself or from an elastic member outside the ring body 11, and the piston ring keeps a natural state under the condition of not receiving the radially inward pressure, and when receiving the radially inward pressure, the pressure overcomes the elastic force of the ring body 11 itself or the elastic member so as to make the annular part in a compressed state. Preferably, the ring body 11 may be an elastomer, or as shown in fig. 1 and 2, the ring portion includes an elastic member 14, and the elastic member 14 is fixed to the ring body 11 to provide an elastic force for maintaining the ring portion in a natural state. The elastic member 14 may be an elastic ring member or preferably a C-shaped spring extending along the ring body 11. The elastic member 14 may be supported on the inner peripheral surface of the ring body 11 or extend within the ring body 11. As shown in fig. 1 and 2, the inner peripheral surface of the ring body 11 is preferably provided with a mounting groove 15, and the elastic member 14 is disposed in the mounting groove 15 and does not protrude from the inner peripheral surface of the ring body 11. The ring body 11 may be made of conventional metal or nonmetal piston ring material, preferably polytetrafluoroethylene composite with self-lubricating function.

As shown in fig. 3, the first end 12 and the second end 13 of the ring body 11 of the piston ring may be respectively wedge-shaped with complementary shapes, so that the projected shapes of the ring body 11, the first end 12 and the second end 13 in the thickness direction are closed annular shapes. According to this embodiment, the first end 12 and the second end 13 in a compressed state may be fully fitted or there may be a small gap between the first end 12 and the second end 13. The projection shape of the piston ring in the thickness direction is a closed ring, so that the requirement of volume sealing can be met even if a small gap exists, and the effect of reducing the influence of abrasion on the volume sealing performance can be achieved after the ring part self-compensates the abrasion gap between the ring part and the inner wall of the cylinder body.

According to another preferred embodiment, as shown in fig. 1 and 2, the first end 12 is formed with a first overlap section 16 and the second end 13 is formed with a second overlap section 17, the projections of at least a part of the first overlap section 16 and the second overlap section 17 overlapping in the thickness direction of the piston ring. Preferably, at least a part of the first overlap section 16 and the second overlap section 17 are always close to or attached to each other in the compressed state and the natural state of the annular portion, so that the gap of the opening portion due to self-compensation of the annular portion is further reduced, and the volume sealing performance is improved. The first overlap section 16 and the second overlap section 17 may have the following structural form: the first overlap section 16 and the second overlap section 17 may be respectively of a step structure capable of being mutually matched; or the first overlap section 16 is a convex pin protruding from the first end 12, and the second overlap section 17 is a concave groove which is formed at the second end 13 and is matched with the shape of the convex pin; or the second overlap section 17 is a male pin protruding from the second end 13 and the first overlap section 16 is a female slot matching the shape of the male pin formed in the first end 12.

According to the preferred embodiment of the application, a piston ring with a self-compensation mechanism is provided, and a piston air compressor with higher service life is provided according to the piston ring. When the piston ring of the piston air compressor is arranged in the cylinder body of the piston air compressor, the ring body 11 is radially restrained by the inner wall of the cylinder body, so that the piston ring is in a compressed state, namely, the first end 12 and the second end 13 are attached to or close to each other. The ring body 11 of the piston ring is always attached to the inner wall of the cylinder body based on the elastic force provided by the elastic member 14. After the piston air compressor is used for a long time and the peripheral surface of the piston ring is worn, the ring body 11 can automatically compensate the gap between the piston air compressor and the inner wall of the cylinder body under the action of the elastic force of the elastic piece 14, and at the moment, the first lap joint section 16 and the second lap joint section 17 still keep close to or are attached to each other so as to keep the sealing reliability of the piston and the inner wall of the cylinder body, so that the worn piston ring can still realize the purpose of volume sealing, and the service life of the piston air compressor is prolonged.

The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in detail.

Moreover, any combination of the various embodiments of the present application may be made without departing from the spirit of the present application, which should also be considered as the disclosure of the present utility model.

Claims

1. A piston ring, characterized in that it comprises: an annular portion comprising a ring body (11), the ring body (11) having a first end (12) and a second end (13) disconnected from each other in a natural state;

the annular portion has a compressed state when the ring body (11) is subjected to radially inward pressure, in which the first end (12) and the second end (13) are brought close to each other so that the projected shape of the ring body (11), the first end (12), and the second end (13) in the thickness direction is a closed annular shape.

2. Piston ring according to claim 1, characterized in that the ring body (11) is an elastomer.

3. A piston ring according to claim 1, wherein the annular portion comprises an elastic member (14), the elastic member (14) being fixed to the ring body (11) to provide an elastic force for maintaining the annular portion in the natural state.

4. A piston ring according to claim 3, wherein the elastic member (14) is a C-shaped spring extending along the ring body (11).

5. A piston ring according to claim 3, wherein the ring body (11) has an inner peripheral surface provided with a mounting groove (15), and the elastic member (14) is provided in the mounting groove (15) so as not to protrude from the inner peripheral surface of the ring body (11).

6. A piston ring according to claim 3, wherein the ring body (11) is a polytetrafluoroethylene composite.

7. A piston ring according to any one of claims 1-6, characterized in that the first end (12) and the second end (13) are each wedge-shaped with complementary shapes.

8. The piston ring according to any one of claims 1-6, characterized in that the first end (12) is formed with a first overlap section (16) and the second end (13) is formed with a second overlap section (17);

in the thickness direction of the piston ring, the projections of at least a part of the first overlap section (16) and the second overlap section (17) overlap.

9. The piston ring according to claim 8, characterized in that the first overlap section (16) and the second overlap section (17) are respectively stepped structures capable of mutually mating; or the first lap section (16) is a convex pin protruding from the first end (12), and the second lap section (17) is a concave groove formed in the second end (13).

10. A piston air compressor, characterized in that it comprises a piston ring according to any one of claims 1-9.