WO2018000877A1

WO2018000877A1 - Ceramic cylinder for refrigerant recovery machine and method for manufacturing ceramic cylinder

Info

Publication number: WO2018000877A1
Application number: PCT/CN2017/079192
Authority: WO
Inventors: 蒋友荣
Original assignee: 浙江飞越机电有限公司
Priority date: 2016-06-30
Filing date: 2017-04-01
Publication date: 2018-01-04
Also published as: CN106089651A

Abstract

A ceramic cylinder for a refrigerant recovery machine, comprising a cylinder body (1), and a connecting rod (2) extending into the cylinder body (1); the end portion of the corresponding connecting rod (2) in the cylinder body (1) is provided with a piston (3) matched with the inner wall of the cylinder body (1), the connecting rod (2) drives the piston (3) to reciprocate along the inner wall of the cylinder body (1), the inner wall of the cylinder body (1) corresponding to the piston (3) has embedded thereon a ceramic cylinder sleeve (4), and a piston ring (7) on the piston (3) is slidably connected to an inner ring surface of the ceramic cylinder sleeve (4) in an interlocking manner. Further provided is a method for manufacturing the ceramic cylinder for the refrigerant recovery machine. The ceramic cylinder is simple in structure, can effectively reduce the abrasion between the cylinder wall and the piston ring, prolong the service life of a compressor, and solve the technical problems in the prior art, such as fast abrasion of the cylinder wall and the piston ring and short service life of the compressor.

Description

Ceramic cylinder for refrigerant recovery machine and method of manufacturing the same

Technical field

The invention relates to a cylinder structure, in particular to a ceramic cylinder for a refrigerant recovery machine which can effectively reduce the wear between the cylinder wall and the piston ring and prolong the service life of the compressor, and a manufacturing method of the ceramic cylinder.

Background technique

The existing refrigerant recovery compressors are generally aluminum cylinders, which are processed by aluminum and then hard oxidized or micro-arc treated. In view of the existing state of the art, the inner wall of the cylinder in contact with the piston ring often has problems such as insufficient hardness, large surface roughness value, insufficient thickness of the surface treatment layer, and the like, in addition, there is a certain impurity in the refrigerant during use, and after the high speed of the DC motor The increase in cylinder temperature, further increase in wear, etc., causes the inner wall of the cylinder and the piston ring to wear quickly, thereby reducing the service life of the compressor.

Summary of the invention

The invention mainly provides a ceramic cylinder for a refrigerant recovery machine and a manufacturing method thereof, which is simple in structure, can effectively reduce the wear between the cylinder wall and the piston ring, and prolongs the service life of the compressor, and solves the prior art. The technical problems of the inner wall of the cylinder and the piston ring being worn out quickly, and the service life of the compressor is short.

The above technical problem of the present invention is mainly solved by the following technical solution: a ceramic cylinder for a refrigerant recovery machine, comprising a cylinder block and a connecting rod extending into the cylinder block, and corresponding rod end portions in the cylinder body are provided The piston has a piston matched with the inner wall of the cylinder, and the connecting rod drives the piston to reciprocally slide along the inner wall of the cylinder. A ceramic cylinder sleeve is embedded in the inner wall of the cylinder corresponding to the piston, and the piston ring on the piston is mutually slidably connected to the ceramic. The inner ring surface of the cylinder liner. Since the ceramic surface has excellent hardness, strength, high temperature resistance and wear resistance, it has a special processing technology, the roughness of the wall surface can reach the mirror surface requirement, and the hardness based on the ceramic is high, the impurities in the refrigerant, and the piston The wear-resistant components in the ring can not scratch the inner wall of the ceramic cylinder liner, and are less likely to adhere to the inner wall and cause the cylinder wall and The friction coefficient between the piston rings increases; when a DC motor is used as the power to achieve higher pumping speed, the rotation speed will reach 3000 rpm or more. At this time, the cylinder body temperature rises higher and the wear speeds up, while the ceramic-based High temperature resistance and low surface roughness, less frictional change, thus minimizing frictional resistance; at the same time, the wear resistance of the piston ring is achieved by using a piston ring made of carbon fiber, copper powder, MoS2 and other components. The ceramic surfaces are matched and upgraded, thereby greatly extending the overall service life of the compressor; the ceramic cylinder sleeve is embedded in the inner wall of the cylinder, and has a simple structure without affecting the performance of all aspects of the compressor.

Preferably, a counterbore is provided on the cylinder block port opposite to the connecting rod, the ceramic cylinder sleeve is embedded in the counterbore, and the edge of the inner port of the ceramic cylinder sleeve abuts on the bottom surface of the counterbore. The ceramic cylinder sleeve is embedded in the counterbore and abuts on the bottom surface of the counterbore. The fixing method is simple and reliable, ensuring that the ceramic cylinder sleeve does not have axial slip and improves the reliability of use.

More preferably, an annular mounting groove is provided on the annular surface of the counterbore corresponding to the inner end of the ceramic cylinder sleeve. By providing an annular mounting groove on the annular surface of the counterbore corresponding to the inner end of the ceramic cylinder sleeve, since the ceramic cylinder sleeve and the cylinder block have an interference fit, when the ceramic cylinder sleeve is mounted, it will inevitably generate traces of dust after rubbing against the inner wall of the cylinder cylinder. The dust powder moves down along the inner wall of the cylinder and accumulates in the annular mounting groove, thereby preventing the powder from affecting the assembly size.

Preferably, the ceramic cylinder liner has an interference fit with the inner wall of the cylinder. Reasonable fit size not only ensures that the ceramic cylinder liner remains intact, but also avoids the ceramic cylinder liner falling off during operation.

A method of manufacturing a ceramic cylinder for a refrigerant recovery machine, comprising the following sequential steps:

1) setting the bore size of the cylinder bore and the outer diameter of the cylinder liner of the ceramic cylinder sleeve so that the two maintain an interference fit when the maximum temperature is reached;

2) taking the cylinder block to the design temperature, and pressing the ceramic cylinder sleeve downward into the cylinder bore;

3) When the lower port of the ceramic cylinder sleeve abuts against the bottom surface of the counterbore, the ceramic cylinder sleeve is installed.

When the ceramic cylinder liner is installed, the heating cylinder body is heated to the design temperature, and the hole in the cylinder block is enlarged. At this time, the ceramic cylinder sleeve at the normal temperature state is pressed into the cylinder bore, and the two are transition fits, and the steam is installed after the installation. The cylinder body recovers the hole retraction at normal temperature, and the two are tightly matched, and the two are ensured to maintain a proper interference when the maximum temperature is reached, thereby satisfying the positioning requirements and avoiding the crushing of the ceramic cylinder sleeve.

Therefore, the ceramic cylinder for a refrigerant recovery machine of the present invention and the method of manufacturing the ceramic cylinder have the following advantages: excellent hardness, strength, high temperature resistance, wear resistance, and mirror surface roughness according to ceramics. When it is used as a ceramic cylinder sleeve and the inner wall of the cylinder, it not only minimizes the frictional resistance, but also effectively reduces the wear between the cylinder wall and the piston ring. At the same time, the ceramic has excellent hardness and high temperature resistance, and the temperature rises in the cylinder block is high. When the frictional force changes little, the service life of the compressor is greatly extended; the ceramic cylinder sleeve is embedded in the counterbore of the inner wall of the cylinder body, the structure is simple, the fixing manner is reliable; and the corresponding sinking at the inner end of the ceramic cylinder sleeve An annular mounting groove is provided on the annular surface of the hole to prevent the powder from affecting the assembly size.

BRIEF DESCRIPTION OF THE DRAWINGS:

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the structure of a ceramic cylinder for a refrigerant recovery machine of the present invention.

detailed description:

The technical solutions of the present invention will be further specifically described below by way of embodiments and with reference to the accompanying drawings.

Example:

As shown in FIG. 1 , a ceramic cylinder for a refrigerant recovery machine and a method for manufacturing the ceramic cylinder of the present invention include a cylinder block 1 and a connecting rod 2 coaxially extending into the cylinder block 1 in the cylinder block 1 The end of the corresponding connecting rod 2 is provided with a piston 3 which is matched with the inner wall of the cylinder block 1. The connecting rod 2 drives the piston 3 to slide back and forth along the inner wall of the cylinder block 1 in the axial direction, and the same as the port of the cylinder block 1 opposite to the connecting rod 2. The shaft is provided with a counterbore 5, and a ceramic cylinder sleeve 4 is embedded in the counterbore 5, the wall thickness of the ceramic cylinder sleeve 4 is 2.5 mm, and the piston ring 5 on the piston 3 is slidably coupled to the inner annular surface of the ceramic cylinder sleeve 4 The ceramic cylinder sleeve 4 and the inner wall of the cylinder block 1 have an interference fit, and the interference is 0.05 mm. The edge of the inner port of the ceramic cylinder sleeve 4 abuts on the bottom surface of the counterbore 5 and is inside the ceramic cylinder liner 4. An annular mounting groove 6 is formed on the annular surface of the counterbore 5 corresponding to the end.

1) setting the inner hole size of the cylinder block 1 and the outer diameter of the ceramic cylinder sleeve 4 which are mutually matched with the ceramic cylinder sleeve 4, so that the two maintain an interference of 0.05 mm at 180 ° C;

2) taking the cylinder block 1 to 220 ° C, taking the ceramic cylinder sleeve 4 downward into the inner hole of the cylinder block 1;

3) When the lower port of the ceramic cylinder liner 4 abuts against the bottom surface of the counterbore 5, the ceramic cylinder sleeve 4 is installed.

The specific embodiments described herein are merely illustrative of the concepts of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described or in a similar manner, without departing from the spirit of the invention or as defined by the appended claims. The scope.

Claims

A ceramic cylinder for a refrigerant recovery machine, comprising a cylinder block (1) and a connecting rod (2) extending into the cylinder block (1), at a corresponding end of the connecting rod (2) in the cylinder block (1) There is a piston (3) interfitted with the inner wall of the cylinder block (1), and the connecting rod (2) drives the piston (3) to reciprocate along the inner wall of the cylinder block (1), characterized by: corresponding to the piston (3) A ceramic cylinder sleeve (4) is embedded in the inner wall of the cylinder block (1), and the piston ring (7) on the piston (3) is slidably coupled to the inner annular surface of the ceramic cylinder sleeve (4).
The ceramic cylinder for a refrigerant recovery machine according to claim 1, characterized in that: the cylinder block (1) opposite to the connecting rod (2) is provided with a counterbore (5), a ceramic cylinder sleeve (4) ) is embedded in the counterbore (5), and the edge of the inner port of the ceramic cylinder sleeve (4) abuts on the bottom surface of the counterbore (5).
A ceramic cylinder for a refrigerant recovery machine according to claim 2, wherein an annular mounting groove (6) is provided on the annular surface of the counterbore (5) corresponding to the inner end of the ceramic cylinder sleeve (4).
A ceramic cylinder for a refrigerant recovery machine according to claim 1 or 2 or 3, characterized in that the ceramic cylinder sleeve (4) has an interference fit with the inner wall of the cylinder block (1).
A method for manufacturing a ceramic cylinder for a refrigerant recovery machine, comprising: the following sequential steps:

1) Set the inner hole size of the cylinder block (1) and the outer diameter of the ceramic cylinder sleeve (4) which are matched with the ceramic cylinder sleeve (4) so that the two maintain an interference fit when the working maximum temperature is reached;

2) Take the cylinder block (1) to the design temperature, and press the ceramic cylinder sleeve (4) downward into the inner hole of the cylinder block (1);

3) When the lower port of the ceramic cylinder sleeve (4) abuts against the bottom surface of the counterbore (5), the ceramic cylinder sleeve (4) is installed.