CN113389710B

CN113389710B - Piston pin on piston compressor and piston compressor

Info

Publication number: CN113389710B
Application number: CN202110849668.3A
Authority: CN
Inventors: 张率华; 黄栋辉; 魏会军; 陈柱锦
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2022-11-18
Anticipated expiration: 2041-07-27
Also published as: CN113389710A

Abstract

The invention discloses a piston pin on a piston compressor and the piston compressor, belongs to the technical field of compressors, and aims to solve the problems that excessive lubricating oil splashed by a crankshaft enters a cylinder hole in the reciprocating motion process of a piston, so that the exhaust oil quantity of the compressor is large, and the heat transfer efficiency of a refrigerator system is reduced. The invention relates to a piston pin on a piston compressor, wherein a first end surface of the piston pin is provided with a first bulge and a second bulge, the second bulge surrounds the periphery of the first bulge, an annular first oil groove is formed between the second bulge and the first bulge, the outer circular surface of the piston pin is provided with a second oil groove, and the second oil groove penetrates through the first end surface and the second end surface of the piston pin. The invention discharges the lubricating oil in the cylinder hole of the compressor through the first oil groove and the second oil groove, improves the lubrication of the piston pin, reduces the motion friction temperature of the piston pin, and avoids the problem of low heat exchange efficiency of the refrigerator caused by large oil carrying amount of the compressor discharge.

Description

Piston pin on piston compressor and piston compressor

Technical Field

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

Background

Along with the improvement of living standard of people, the demand of public consumers on efficient, energy-saving and fresh-keeping refrigerators is increasing. The piston compressor is used as a core component of a refrigerator system, and the operation power consumption of the piston compressor accounts for a main part of the total energy consumption of the refrigerator. The piston pin is used as a connecting part of the piston and the connecting rod, and reciprocates in the cylinder bore along with the piston, so that the piston pin faces adverse operating conditions such as high temperature, high torsion and the like.

During the operation of the compressor, one of the problems is that: the piston pin has poor lubrication and high surface temperature; the second problem is: excessive lubricating oil splashed by the crankshaft enters the cylinder hole in the reciprocating motion process of the piston, so that the exhaust oil quantity of the compressor is large, and the heat transfer efficiency of a refrigerator system is reduced; the third problem is: the piston pin generates unbalanced inertial force during the reciprocating motion, thereby causing noise and vibration.

Disclosure of Invention

In view of the above, the present invention discloses a piston pin for a piston compressor and a piston compressor, so as to solve at least one of the above problems.

In order to achieve the above object, the invention adopts the following technical scheme:

the invention discloses a piston pin on a piston compressor, wherein a first end surface of the piston pin is provided with a first bulge and a second bulge, the second bulge surrounds the periphery of the first bulge and forms an annular first oil groove with the first bulge, the outer circular surface of the piston pin is provided with a second oil groove, the second oil groove penetrates through the first end surface and the second end surface of the piston pin, and the first oil groove is communicated with the second oil groove;

the second oil groove is used for guiding out lubricating oil accumulated in the first oil groove from the second end surface when the piston type compressor operates.

Further, a hollow cavity penetrating through the second end face is formed in the first protrusion, and the hollow cavity and the outer circular surface of the piston pin are arranged in a coaxial mode.

Further, the second protrusion is provided with a notch communicated with the second oil groove.

Further, the bottom surface of the opening is flush with the bottom surface of the second oil groove.

Further, the height of the first protrusion is smaller than the height of the second protrusion.

Further, the second oil groove is an oil groove extending along the axial direction of the piston pin.

Further, the second oil groove is a straight groove parallel to the axis of the piston pin.

Further, an annular oil groove communicated with the second oil groove is formed in the outer circular surface of the piston pin.

Further, the cross section of the second oil groove and the cross section of the annular oil groove are both in a semi-circular arc shape.

A second aspect of the present invention discloses a piston compressor, comprising:

the cylinder seat is provided with a cylinder hole, the cylinder seat is rotatably provided with a crankshaft, and one side, close to a long shaft of the crankshaft, of the inner surface of the cylinder hole is provided with an oil drainage hole;

the side surface of the piston is provided with a piston pin hole, and the piston is movably arranged in the cylinder hole;

in a first aspect, the piston pin is rotatably connected to a connecting rod rotatably disposed on a short axis of the crankshaft, the piston pin is fixedly mounted in the piston pin bore, and the second end surface is disposed adjacent to the oil drain hole;

when the piston compressor is operated, the lubricating oil thrown into the upper surface of the cylinder bore by the crankshaft is accumulated in the first oil groove under the action of self gravity, flows out of the first oil groove to the second end face side, and is finally discharged from the oil drain hole.

Has the advantages that: the invention discharges the lubricating oil in the cylinder hole of the compressor through the first oil groove and the second oil groove, improves the lubrication of the piston pin, reduces the temperature of the motion friction of the piston pin, and avoids the problem of low heat exchange efficiency of the refrigerator caused by large oil carrying amount of the compressor discharge.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.

FIG. 1 shows a front view of embodiment 1;

fig. 2 shows a top view of fig. 1, i.e. a view from the side of the first end face a;

FIG. 3 showsbase:Sub>A cross-sectional view A-A of FIG. 1;

FIG. 4 shows an enlarged view of a portion of FIG. 3 at I;

FIG. 5 shows a partial cross-sectional view of the piston pin in connection with the piston in embodiments 1 and 2;

FIG. 6 is an overall schematic view showing the connection of the plug pin to the piston in embodiments 1 and 2;

the arrows in fig. 5 and 6 indicate the direction in which the lubricating oil is thrown in.

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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrases "comprising one of \8230;" does not exclude the presence of additional like elements in an article or system comprising the element.

At present, piston pin lubrication is poor in the operation process of a piston compressor, more lubrication enters a cylinder in the reciprocating motion process of a piston, so that the exhaust oil quantity of the compressor is large, and the problems of large vibration and noise caused by unbalanced piston pin reciprocating motion inertia force are solved. The invention aims at the problems and improves the piston pin. The lubricating oil thrown out when the crankshaft is operating falls into the upper end surface (first end surface) of the piston pin in a parabolic trajectory. According to the invention, the annular first oil groove is arranged on the piston pin, so that lubricating oil thrown into the first end surface of the piston pin by the crankshaft is accumulated, the lubricating oil flows into the second end surface of the piston pin from the second oil groove under the action of self gravity and flows into the oil drainage hole on the lower surface of the cylinder hole of the compressor from the second end surface to be discharged, and the problems that excessive lubricating oil is accumulated in the cylinder hole too much, so that excessive lubricating oil enters a refrigerator system and the heat transfer efficiency is reduced are solved.

To further illustrate the technical solution of the present invention, the following specific examples are provided as shown in fig. 1 to 6.

Example 1

In the present embodiment, a piston pin on a piston compressor is provided, as shown in fig. 1 to 3, a first end surface a of the piston pin 10 is provided with a first protrusion 11 and a second protrusion 12, the second protrusion 12 surrounds the outer periphery of the first protrusion 11 and forms an annular first oil groove 13 with the first protrusion 11, an outer circumferential surface of the piston pin 10 is provided with a second oil groove 14, the second oil groove 14 penetrates through the first end surface a and a second end surface b of the piston pin 10, and the first oil groove 13 is communicated with the second oil groove 14;

the second oil groove 14 is used for guiding out the lubricating oil accumulated in the first oil groove 13 from the second end face b when the piston compressor is operated.

In an embodiment of this embodiment, the first oil groove 13 is a circular groove.

When the piston pin 10 is installed and used, the piston pin 10 is vertically arranged, the first end face a of the piston pin is upward, the piston pin 10 is matched with a connecting rod 20 and a piston 30 of a compressor, and an oil passing channel is formed between the matching surface of the second oil groove 14 and the piston 30 and the matching surface of the connecting rod 20. In the running process of the compressor, the lubricating oil thrown into the cylinder by the crankshaft is accumulated at the position of the first end surface a, flows into the oil passing channel from the first oil groove 13 under the action of the self gravity, flows out of the oil passing channel and enters the oil leaking hole at the bottom of the cylinder to be discharged, so that the phenomenon that excessive lubrication in the cylinder enters a refrigerator system to participate in heat exchange and influences the heat exchange efficiency is avoided; meanwhile, during the reciprocating motion of the piston 30, the lubricating oil can also improve the lubricating property during the flowing process of the second oil groove 14, and the temperature of the friction pair can be reduced by absorbing heat by the lubricating oil.

In order to further increase the oil discharge speed of the lubricating oil in the cylinder bore, the first protrusion 11 is provided with a hollow cavity 16 penetrating through the second end surface b, the hollow cavity 16 and the outer circumferential surface of the piston pin 10 are coaxially arranged, and the hollow cavity 16 is penetrated through the first oil groove 13. The hollow cavity 16 is arranged in the center of the piston pin 10, on one hand, an oil discharge channel can be increased, the oil discharge speed is increased, and lubrication accumulated on the first end face a is prevented from entering a refrigerator system, and on the other hand, the hollow cavity 16 reduces the overall mass of the piston pin 10 and reduces vibration and noise caused by unbalanced inertia force in the movement process.

In an embodiment of the present invention, the second protrusion 12 is provided with a notch 18 penetrating the second oil groove 14, and a bottom surface of the notch 18 may be flush with a bottom surface of the first oil groove 13, so that all the lubricating oil in the first oil groove 13 can be discharged.

Further, as shown in fig. 2, the bottom surface of the gap 18 is flush with the bottom surface of the second oil groove 14, so that the lubricating oil can flow into the second oil groove 14 from the first oil groove 13 first.

Further, as shown in fig. 3 and 4, the height H1 of the first protrusion 11 is smaller than the height H2 of the second protrusion 12. When the lubricating oil flows out from the second oil groove 14 and the lubricating oil still accumulates in the first oil groove 13, the lubricating oil will be full in the second oil groove 14 and overflow from the first protrusion 11 and enter the hollow cavity 16, so that the lubricating oil can continuously flow out from the second oil groove 14, the lubricating effect of the piston pin 10 is improved, and the lubricating oil is prevented from accumulating too much in the first end surface a and entering the cylinder bore.

Further, the second oil groove 14 is an oil groove extending in the axial direction of the piston pin 10.

Further, as shown in fig. 1, the second oil groove 14 is a straight groove parallel to the axis of the piston pin 10. Alternatively, the second oil groove 14 may be provided in two, symmetrically disposed on both sides of the axis of the piston pin 10.

In this embodiment, the second oil groove 14 may be a straight groove or a spiral groove, and the straight groove is preferred in this embodiment.

Further, as shown in fig. 1, an annular oil groove 17 penetrating the second oil groove 14 is formed in the outer circumferential surface of the piston pin 10, so that the lubrication flowing through the second oil groove 14 flows around the piston pin along the circumferential direction of the annular oil groove 17, and the lubrication effect of the piston pin 10 can be further improved. Alternatively, the annular oil groove 17 is located at a position intermediate to the outer circumferential surface of the piston pin 10.

Optionally, the cross section of the second oil groove 14 and the cross section of the annular oil groove 17 are both semi-circular arcs.

Optionally, the radius of the cross section of the second oil groove 14 is 0.3mm to 0.9mm, and the radius of the cross section of the annular oil groove 17 is 0.4mm to 1mm.

Optionally, the hollow cavity 16 is a circular cavity, and the diameter of the hollow cavity 16 is 1mm to 3mm.

As shown in fig. 5, in the present embodiment, the outer circumferential surface of the piston pin 10 is further provided with a pin shaft hole 19, an axis of the pin shaft hole 19 is perpendicular to an axis of the piston pin 10 and is used for being positioned in cooperation with a pin hole 31 on the piston 30, a piston pin hole 32 is further provided on a side surface of the piston 30, the piston pin hole 32 is a through hole, the piston pin 20 is disposed in the piston pin hole 32, and the piston 30 is fixedly connected with the piston pin 10 by a pin shaft.

It should be noted that, in this embodiment, the annular first oil groove 13 may be a circular ring shape, or may be changed into other shapes according to the requirement, such as an elliptical ring or a square ring. The cross-sectional shape of the annular oil groove 17 may be equally replaced as required, such as rectangular or circular.

Example 2

The present embodiment provides a piston compressor, as shown in fig. 5 and 6 (a cylinder block is not shown in fig. 5 and 6), including:

the cylinder seat is provided with a cylinder hole, the cylinder seat is rotatably provided with a crankshaft 40, and one side, close to a long shaft of the crankshaft, of the inner surface of the cylinder hole is provided with an oil drainage hole;

the piston 30, the side of the said piston 30 has piston pin holes 31, the said piston 30 is set up in the said cylinder bore movably;

in the piston pin 10 of embodiment 1, the piston pin 10 is rotatably connected with a connecting rod 20, the connecting rod 20 is rotatably arranged on a short shaft of the crankshaft 40, the piston pin 10 is fixedly installed in the piston pin hole 31, wherein a pin shaft hole 19 is coaxially arranged with the pin hole 31 and fixes the piston pin 10 and the piston 30 through pin shaft insertion; the second end face b is arranged close to the oil leaking holes;

when the piston compressor is operated, the lubricating oil thrown by the crankshaft 40 to the upper surface of the cylinder bore accumulates in the first oil groove 13 under its own weight, and flows out from the first oil groove 13 to the second end face b side, and is finally discharged from the oil drain holes.

The length of the piston pin 10 is smaller than the diameter of the piston 30, and the first end surface a of the piston pin 10 is sunk into the pin hole 31.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A piston pin on a piston compressor is characterized in that a first end face of the piston pin is provided with a first bulge and a second bulge, the height of the first bulge is smaller than that of the second bulge, a hollow cavity penetrating through a second end face of the piston pin is arranged on the first bulge, the hollow cavity and the outer circular face of the piston pin are coaxially arranged, the second bulge surrounds the periphery of the first bulge and forms an annular first oil groove with the first bulge, a second oil groove is arranged on the outer circular face of the piston pin, the second oil groove penetrates through the first end face and the second end face of the piston pin, and the first oil groove is communicated with the second oil groove;

2. A piston pin according to claim 1, characterized in that said second projection is provided with a gap communicating with said second oil groove.

3. A piston pin according to claim 2, wherein the bottom surface of the gap is disposed flush with the bottom surface of the second oil groove.

4. A piston pin according to patent claim 3, characterized in that said second oil groove is an oil groove extending in the axial direction of the piston pin.

5. A piston pin according to claim 4, characterized in that said second oil groove is a straight groove parallel to the piston pin axis.

6. A piston pin according to claim 5, characterized in that the outer circumferential surface of the piston pin is provided with an annular oil groove communicating with the second oil groove.

7. The piston pin according to claim 6 wherein said second oil groove has a cross-section and said annular oil groove has a cross-section that is both semi-circular.

8. A piston compressor, comprising:

the oil drain structure comprises an air cylinder seat, wherein an air cylinder hole is formed in the air cylinder seat, a crankshaft is rotatably arranged on the air cylinder seat, and an oil drain hole is formed in one side, close to a long shaft of the crankshaft, of the inner surface of the air cylinder hole;

a piston pin according to any of claims 1-7, having a connecting rod pivotally attached thereto, said connecting rod being pivotally disposed on a short axis of said crankshaft, said piston pin being fixedly mounted in said piston pin bore, said second end surface being disposed adjacent said oil drain;

when the piston compressor is operated, the lubricating oil thrown onto the upper surface of the cylinder bore by the crankshaft is accumulated in the first oil groove under the action of self gravity, flows out of the first oil groove to the second end face side, and is finally discharged from the oil drain hole.