CN112196998A

CN112196998A - Piston pin, piston assembly and reciprocating compressor

Info

Publication number: CN112196998A
Application number: CN202011044812.8A
Authority: CN
Inventors: 黄栋辉
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-01-08
Anticipated expiration: 2040-09-28
Also published as: CN112196998B

Abstract

The invention relates to the technical field of reciprocating compressors, in particular to a piston pin, a piston assembly and a reciprocating compressor. The piston pin comprises: the fixing part and the supporting part are perpendicular to each other, the width of the fixing part is larger than that of the supporting part, and the center of the fixing part is deviated from that of the supporting part; during assembly, the small end of the connecting rod is installed in the piston, the piston pin is inserted into the piston until the supporting part of the piston pin penetrates through the small end of the connecting rod, and the fixing part is limited at the end part of the piston, so that one of the piston pin and the piston is assembled; in a similar way, when the piston assembly in the embodiment is applied to compressors with other discharge capacities, the piston pin is only required to be exchanged in the left and right directions, so that the piston pin and the piston are assembled in another mode, the design scheme can be applied to reciprocating compressors with at least two specifications, and finally the production cost is reduced.

Description

Piston pin, piston assembly and reciprocating compressor

Technical Field

The invention relates to the technical field of reciprocating compressors, in particular to a piston pin, a piston assembly and a reciprocating compressor.

Background

The reciprocating compressor is a compressor which can make the volume of cylinder body change periodically and can implement pressurization and transportation of gas by means of reciprocating movement of piston or diaphragm in the cylinder.

However, in the above structure, there is only one assembling method between the piston pin and the piston, and thus the piston pin can only be applied to compressors of the same specification, but cannot be applied to compressors of different specifications.

Disclosure of Invention

An object of the application is to provide a piston pin, a piston assembly and a reciprocating compressor to solve the problem that there is only one assembling mode between a piston pin and a piston in the prior art.

Technical scheme (I)

To achieve the above object, a first aspect of the present invention provides a piston pin comprising: the fixing part and the supporting part are perpendicular to each other, the width of the fixing part is larger than that of the supporting part, and the center of the fixing part is deviated from that of the supporting part.

Optionally, the supporting portion is perpendicular to one end of the fixing portion.

Optionally, a positioning pin hole for inserting an elastic positioning pin is further penetrated through a side wall surface of the fixing portion.

Optionally, the upper wall of the fixing portion is further provided with a mounting counter bore in a direction towards the supporting portion, and the mounting counter bore penetrates through the positioning pin hole.

Optionally, the fixing portion is configured as a rounded rectangle.

To achieve the above object, a second aspect of the present invention provides a piston assembly comprising: a piston, a connecting rod and a gudgeon pin according to any of the preceding claims, the small end of the connecting rod being mounted in the piston by the gudgeon pin.

Optionally, set up the installation pinhole in the piston, the installation pinhole is formed with from last to down in proper order: the connecting rod comprises a first mounting cavity and a second mounting cavity which are communicated, the fixing part of the piston pin is mounted in the first mounting cavity, and the small end of the connecting rod is mounted in the second mounting cavity through the supporting part of the piston pin.

Optionally, the size of the second mounting cavity is larger than the size of the first mounting cavity.

Optionally, the shape of the first mounting cavity is matched with the shape of the fixing portion.

Optionally, the position of the limiting hole arranged on the piston coincides with the position of the mounting pin hole arranged on the piston pin.

To achieve the above object, a third aspect of the present invention provides a reciprocating compressor comprising: a piston assembly as claimed in any one of the preceding claims.

(II) advantageous effects

Compared with the prior art, the invention has the following beneficial effects:

the present invention provides a piston pin comprising: the fixing part and the supporting part are perpendicular to each other, the width of the fixing part is larger than that of the supporting part, and the center of the fixing part is deviated from that of the supporting part; and a piston assembly comprising: a piston, a connecting rod and a gudgeon pin according to any of the preceding claims, the small end of the connecting rod being mounted in the piston by the gudgeon pin.

During assembly, the small end of the connecting rod is installed in the piston, the piston pin is inserted into the piston until the supporting part of the piston pin penetrates through the small end of the connecting rod, and the fixing part is limited at the end part of the piston, so that one of the piston pin and the piston is assembled; in a similar way, when the piston assembly in the embodiment is applied to compressors with other discharge capacities, the piston pin is only required to be exchanged in the left and right directions, so that the piston pin and the piston are assembled in another mode, the design scheme can be applied to reciprocating compressors with at least two specifications, and finally the production cost is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for a person skilled in the art that other drawings can be obtained according to the drawings without inventive exercise, wherein:

FIG. 1 is a perspective view of a piston pin according to the present invention;

FIG. 2 is a cross-sectional view of a piston pin according to the present invention;

FIG. 3 is a cross-sectional view of another angle of the piston pin of the present invention;

FIG. 4 is a schematic view of the piston assembly of the present invention in a first operating condition;

fig. 5 is a schematic structural view of the piston assembly in a second operating state according to the present invention.

In the figure: 1. a fixed part; 2. a support portion; 3. a positioning pin hole; 4. mounting a counter bore; 5. a piston; 6. a connecting rod; 7. mounting pin holes; 8. a first mounting cavity; 9. a second mounting cavity; 10. an elastic positioning pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The invention is described in further detail below with reference to the following figures and detailed description:

as shown in fig. 1 to 3, a first aspect of the present application provides a piston pin including: mutually perpendicular's fixed part 1 and supporting part 2, the width of fixed part 1 is greater than the width of supporting part 2, and the center of fixed part 1 deviates from with the center of supporting part 2 mutually, it is concrete, the fixed part both ends to the fixed part with the distance inequality of supporting part junction can, preferably, as shown in fig. 1, supporting part 2 is mutually perpendicular with the one end of fixed part 1, preferably, fixed part 1 sets up to fillet rectangle, it is concrete, as shown in fig. 1, the fillet terminal surface radius that the supporting part is connected with the fixed part is 3.964mm, the length in fixed part middle section is 4mm, the fillet terminal surface radius of the fixed part other end is 3.964 mm.

Specifically, as shown in fig. 4, when the piston assembly in this embodiment is applied to a compressor with one displacement, the small end of the connecting rod is first installed in the piston, and then the piston pin is inserted into the piston, at this time, the end of the fixing portion farther from the connection between the fixing portion and the supporting portion is installed on the side of the piston close to the connecting rod, and the end of the fixing portion closer to the connection between the fixing portion and the supporting portion is installed on the side of the piston close to the small end; the supporting part of the piston pin penetrates through the small end of the connecting rod, and the fixing part is limited at the end part of the piston, so that one of the piston pin and the piston is assembled; similarly, when the piston assembly in this embodiment is applied to a compressor with other displacement volumes, the piston pin only needs to be exchanged in the left-right direction, that is, as shown in fig. 5, the end of the fixing portion farther from the connection between the fixing portion and the supporting portion is installed on the side of the piston close to the small end, and the end of the fixing portion closer to the connection between the fixing portion and the supporting portion is installed on the side of the piston close to the connecting rod, so as to realize another assembly of the piston pin and the piston.

According to an embodiment of the present invention, in order to ensure the stable connection between the piston pin and the piston, as shown in fig. 1, 4 and 5, a positioning pin hole 3 for inserting an elastic positioning pin 10 is further penetrated through a side wall surface of the fixing portion 1, and a limiting hole is formed in a corresponding side wall surface of the piston close to one side of the connecting rod, preferably, the limiting hole coincides with the positioning pin hole 3 of the fixing portion, and during assembly, the elastic positioning pin 10 is only required to be inserted into the limiting hole and the positioning pin hole 3 in sequence, so as to limit the vertical movement of the piston pin.

Further, in order to facilitate the elastic positioning pin 10 to be smoothly inserted into the limiting hole and the positioning pin hole 3, preferably, rounded corners are disposed in the limiting hole and the positioning pin hole 3.

According to an embodiment of the invention, in order to ensure that the position of the positioning pin hole 3 corresponds to the position of the limiting hole, the upper wall surface of the fixing part 1 is further provided with a mounting counter bore 4 in the direction towards the supporting part 2, the mounting counter bore 4 passes through the positioning pin hole 3, preferably, the bottom of the mounting counter bore 4 is provided with a round corner, after a piston pin is inserted into the piston, if the positioning pin hole 3 arranged on the piston pin does not correspond to the limiting hole arranged on the piston, the piston pin is inserted into the mounting counter bore 4 by using special equipment, illustratively, special equipment such as an adjusting rod and the like, and the special equipment is pulled to drive the positioning pin hole 3 to move towards the direction corresponding to the limiting hole, so that.

As shown in fig. 4 and 5, a second aspect of the present application provides a piston assembly including: a piston 5, a connecting rod 6 and a piston pin according to any of the preceding claims, the small end of the connecting rod 6 being mounted in the piston 5 by means of the piston pin.

According to an embodiment of the present invention, as shown in fig. 4 and 5, a mounting pin hole 7 is formed in the piston 5, and the mounting pin hole 7 is formed with: the connecting rod comprises a first mounting cavity 8 and a second mounting cavity 9 which are communicated with each other, preferably, the size of the second mounting cavity 9 is larger than that of the first mounting cavity 8, a fixing part 1 of a piston pin is installed in the first mounting cavity 8, and a small end of a connecting rod 6 is installed in the second mounting cavity 9 through a supporting part 2 of the piston pin.

Specifically, the shape of the first mounting cavity 8 is matched with that of the fixing part 1, so that the fixing part is stably mounted in the first mounting cavity; preferably, the fixing part 1 is a rounded rectangle, and correspondingly, the first mounting cavity 8 is matched with the rounded rectangle; specifically, the fixing part is in clearance fit with the first mounting cavity, the fit clearance is 0.002-0.013mm, the supporting part is also in clearance fit with the second mounting cavity, and the fit clearance is 0-0.012 mm.

A third aspect of the present application provides a reciprocating compressor comprising: a piston assembly according to any preceding claim.

The embodiments in the present description are all described in a progressive manner, and some of the embodiments are mainly described as different from other embodiments, and the same and similar parts among the embodiments can be referred to each other.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying importance; the words "bottom" and "top", "inner" and "outer" refer to directions toward and away from, respectively, a particular component geometry.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A piston pin, comprising: the fixing part comprises a fixing part (1) and a supporting part (2) which are perpendicular to each other, wherein the width of the fixing part (1) is larger than that of the supporting part (2), and the center of the fixing part (1) deviates from that of the supporting part (2).

2. A piston pin according to patent claim 1, characterized in that the supporting part (2) is perpendicular to one end of the fixing part (1).

3. A piston pin according to patent claim 1, characterized in that the side wall surfaces of the fixing part (1) also run through positioning pin holes (3) for the insertion of elastic positioning pins (10).

4. A piston pin according to claim 3, characterized in that the upper wall of the fixing part (1) is further provided with a mounting counterbore (4) in the direction of the support part (2), which mounting counterbore (4) passes through the positioning pin hole (3).

5. A piston pin according to patent claim 1, characterized in that the fixing part (1) is provided with rounded rectangles.

6. A piston assembly, comprising: a piston (5), a connecting rod (6) and a piston pin according to any of claims 1-5, by means of which the small end of the connecting rod (6) is mounted in the piston (5).

7. The piston assembly according to claim 6, characterized in that a mounting pin hole (7) is formed in the piston (5), and the mounting pin hole (7) is sequentially formed from top to bottom: the connecting rod comprises a first mounting cavity (8) and a second mounting cavity (9) which are communicated with each other, a fixing part (1) of the piston pin is mounted in the first mounting cavity (8), and a small end of the connecting rod (6) is mounted in the second mounting cavity (9) through a supporting part (2) of the piston pin.

8. Piston assembly according to claim 7, characterized in that the dimensions of the second mounting chamber (9) are larger than the dimensions of the first mounting chamber (8).

9. Piston assembly according to claim 7, wherein the shape of the first mounting cavity (8) is adapted to the shape of the fixing part (1).

10. An assembly according to claim 6, characterized in that the position of the limiting hole provided in the piston (5) coincides with the position of the mounting pin hole (7) provided in the wrist pin.

11. A reciprocating compressor, comprising: a piston assembly as claimed in any one of claims 6 to 10.