CN-121760921-B - Liquid impact test device for compressor and method for determining refrigerant filling amount in liquid impact test of compressor

CN121760921BCN 121760921 BCN121760921 BCN 121760921BCN-121760921-B

Abstract

The invention provides a compressor liquid impact test device and a method for determining refrigerant filling amount in the compressor liquid impact test, which relate to the technical field of compressor detection, wherein the device comprises a compressor, a liquid storage device, data acquisition equipment, a computer and a strain gauge, the strain gauge is arranged on a cross slip ring in the compressor, the compressor is provided with an exhaust pipe and an air suction pipe at the upper and lower parts, the exhaust pipe is connected with an inlet of the liquid storage device through a first pipeline, the air suction pipe is connected with an outlet of the liquid storage device through a second pipeline, an inlet stop valve is arranged on the first pipeline, and an outlet stop valve and an air suction pressure gauge are arranged on the second pipeline. The method comprises the steps of stress analysis of the cross slip ring, determination of the sticking position of the strain gauge, design of a test device, strain test of the cross slip ring and determination of the refrigerant filling amount of the liquid impact test of the compressor. According to the invention, the strain gauge is stuck on the cross slip ring, the strain of the cross slip ring in the liquid impact test of the compressor under different refrigerant filling amounts is tested, and finally the refrigerant filling amount in the liquid impact test of the compressor is determined.

Inventors

LIU YUHUAN
XU ZHIHUI
Kang Qingyu
YANG CHUNLI
SUN LI
HE QING
WANG JILONG

Assignees

冰山松洋压缩机(大连)有限公司

Dates

Publication Date: 20260508
Application Date: 20260303

Claims (9)

1. A method for determining refrigerant charge of a compressor liquid impact test is characterized by adopting a compressor liquid impact test device, wherein the compressor liquid impact test device comprises a compressor (1), a liquid storage device (4), a data acquisition device (6), a computer (7) and a strain gauge (9), wherein the strain gauge (9) is arranged on a cross slip ring (8) in the compressor (1), the strain gauge (9) is connected with the data acquisition device (6) through an inner and outer connecting terminal (10) penetrating out of the compressor (1), and the data acquisition device (6) is electrically connected with the computer (7); An exhaust pipe (11) and an air suction pipe (12) are respectively arranged above and below the compressor (1), the exhaust pipe (11) is connected with an inlet at the top of the liquid storage device (4) through a first pipeline, the air suction pipe (12) is connected with an outlet at the top of the liquid storage device (4) through a second pipeline, an inlet stop valve (3) is arranged on the first pipeline, an outlet stop valve (5) and an air suction pressure gauge (2) are arranged on the second pipeline, the air suction pressure gauge (2) is arranged between the outlet stop valve (5) and the air suction pipe (12), and the liquid storage device (4) is connected with an external refrigerant tank; the method for determining the refrigerant charge of the liquid impact test of the compressor comprises the following steps: step 1, carrying out stress analysis on the cross slip ring (8) to determine the stress position of the cross slip ring (8) when the compressor (1) runs; step 2, mounting a strain gauge (9) at a stress position of a cross slip ring (8); Step 3, assembling a liquid impact test device of a compressor, namely installing a cross slip ring (8) provided with a strain gauge (9) into the compressor (1), connecting a lead-out wire of the strain gauge (9) with a connecting terminal (10) at the inner side of the compressor (1), connecting the connecting terminal (10) at the outer side of the compressor (1) with a data acquisition device (6), connecting the data acquisition device (6) with a computer (7), connecting an air suction pipe (12) with an outlet of a liquid storage device (4) through a copper pipe pipeline, sequentially installing an air suction pressure gauge (2) and an outlet stop valve (5) on the copper pipe pipeline, and enabling the outlet stop valve (5) to be in a closed state, connecting an exhaust pipe (11) with an inlet of the liquid storage device (4) through the copper pipe pipeline, and installing an inlet stop valve (3) on the copper pipe pipeline, wherein the inlet stop valve (3) is in the closed state; step4, calculating to obtain an initial filling quantity A of the refrigerant; Step 5, filling the device with the refrigerant, namely opening a joint (13) of a liquid storage device (4), connecting an external refrigerant tank with the joint (13), filling the liquid refrigerant into the liquid storage device (4), simultaneously opening an outlet stop valve (5) and an inlet stop valve (3), enabling the refrigerant to flow into the compressor (1) along two copper pipe lines through an exhaust pipe (11) and an air suction pipe (12) at the same time after the liquid storage device (4) is filled with the refrigerant until the refrigerant filling amount in the compressor (1) reaches B, and screwing down the joint (13) after the refrigerant filling is finished; Step 6, after confirming that the liquid impact test device of the compressor is abnormal, switching on a power supply (14), starting the compressor (1), stopping the compressor (1) after running for 3 seconds, and recording a strain curve of the cross slip ring (8) through a computer (7); step 7, stopping the compressor (1) and standing, and observing pointer change of the suction pressure gauge (2) until the suction pressure is reduced to a preset pressure value; Step 8, repeating the step 6 and the step 7 twice, and recording a strain curve of the cross slip ring (8) for 3 times; step 9, turning off a power supply (14), opening a joint (13) of the liquid storage device (4), releasing a certain weight of refrigerant from the compressor liquid impact test device through the liquid storage device (4), marking the refrigerant as C, and screwing the joint (13) after the C value refrigerant is released; Step 10, repeating the step 6, the step 7 and the step 8, and recording the strain curve of the cross slip ring (8) for 3 times again; Step 11, repeating the step 9 and the step 10 until the weight of the refrigerant in the compressor liquid impact test device is less than the weight D of the refrigerant corresponding to the volume of the liquid accumulator (4); And 12, finishing the test, confirming the acquired strain curves of the cross slip ring (8), recording the peak strain of each group of curves, calculating the average value of the peak strain for 3 times under different weight refrigerants, and carrying out statistics and analysis on the average value of all peak strains, wherein the maximum strain represents the strongest liquid impact degree of the dynamic and static vortex disk of the compressor (1) and the maximum gas force exerted on the cross slip ring (8), and the weight of the refrigerant corresponding to the maximum strain is the liquid impact test refrigerant filling quantity of the compressor (1).
2. The method of determining refrigerant charge for a compressor liquid impact test of claim 1, wherein the first and second lines are copper tubing.
3. Method for determining the filling quantity of a compressor liquid impact test refrigerant according to claim 1, characterized in that the top of the accumulator (4) is provided with a joint (13), said joint (13) being connected to an external refrigerant tank.
4. Method for determining the refrigerant charge for a compressor liquid impact test according to claim 1, characterized in that the compressor (1) is fitted with a power supply (14).
5. The method for determining the refrigerant charge in the liquid impact test of the compressor according to claim 1, wherein in the step 2, the stress positions of the cross slip ring (8) are two, and the 1-piece strain gauge (9) is horizontally stuck on the plane area of the back surface of the key at one stress position through special glue.
6. The method for determining refrigerant charge in a liquid impact test of a compressor according to claim 1, wherein in the step 4, the initial refrigerant charge a satisfies the following formula: A=a 1 +a 2 -a 3 ; where a 1 is the compressor volume, a 2 is the accumulator volume, and a 3 is the refrigerant charge in the compressor.
7. The method for determining the refrigerant charge for the liquid impact test of a compressor according to claim 1, wherein in said step 5, b=a×refrigerant density.
8. The method for determining refrigerant charge in a liquid impact test of a compressor according to claim 1, wherein in the step 9, the value of C is determined according to the initial charge of refrigerant B, and C is 1kg when 14kg > B is greater than or equal to 6kg, and C is 0.5kg when 6kg > B is greater than or equal to 2 kg.
9. The method for determining refrigerant charge for a compressor liquid impact test according to claim 1, wherein in the step 11, d=a 2 ×refrigerant density.

Description

Liquid impact test device for compressor and method for determining refrigerant filling amount in liquid impact test of compressor Technical Field The invention relates to the technical field of compressor detection, in particular to a compressor liquid impact test device and a method for determining refrigerant filling quantity in a compressor liquid impact test. Background In the technical field of detection of the existing compressor, for the hydraulic impact test of the compressor, a unified hydraulic impact test standard is not formed at present in China, and only a part of relevant specifications can be referred to. Each compressor enterprise establishes liquid impact test enterprise standard according to enterprise product characteristics, and the running state and damage degree of the compressor are observed mainly by simulating the process of liquid refrigerant or lubricating oil entering the compressor. The main purpose of the compressor hydraulic impact test is to evaluate the reliability of the structure and the components of the compressor under the extreme liquid return working condition by simulating the operation of the compressor under the hydraulic impact condition, and the method is a vital ring in the development and design of the compressor. Based on statistics and analysis of the causes of after market failure of compressors, about 30% of which are failures caused by component breaks, most of which are related to compressor liquid hammer. The phenomenon of liquid impact of the compressor refers to that liquid is sucked into a compression cavity of the compressor, so that the compressor runs with liquid, the liquid impact is a fault with the greatest harm in the running process of a refrigerating system, the main stress part of the compressor can be damaged in a short time, and the damage is a deadly killer of the refrigerating compressor. Besides considering the liquid impact prevention measures in the product research and development stage, each compressor enterprise can evaluate the liquid impact reliability of the product through a liquid impact test in the product evaluation stage so as to meet the market demand. The liquid impact test method of each compressor enterprise is quite different, and the liquid impact test conditions are quite various. The method is characterized in that the liquid state refrigerant of different types of compressors needs to be filled to enable the compressors to generate severe liquid impact, namely, the determination of the refrigerant filling amount of the liquid impact test of the compressors is a vital circle of the liquid impact test of the compressors. The method has the advantages that the refrigerant is too much to be filled, the compressor cannot be operated, the refrigerant is too little to be filled, the effect of evaluating the liquid impact reliability cannot be achieved, the result of the liquid impact test of the compressor is lack of comparability due to the fact that the refrigerant is not standardized in the filling quantity, and the method is waste of test resources. At present, a detection method of the peak current of the liquid impact experiment of the vortex compressor based on LabView exists in China, and the refrigerant filling amount during liquid impact can be determined through the peak current. The method is based on the fact that the running current of the compressor is proportional to the load, the factors influencing the load of the compressor are many, the interference of other factors influencing the load is required to be eliminated in the experiment, and the preparation and experimental design in the early stage of the experiment are relatively complex. Disclosure of Invention According to the technical problems set forth above, a compressor liquid impact test device and a method for determining refrigerant charge of the compressor liquid impact test are provided. The invention mainly comprises the steps of sticking a strain gauge on a cross slip ring of a compressor, testing the strain of the cross slip ring of a liquid impact test of the compressor under different refrigerant filling amounts, and finally determining the refrigerant filling amount of the liquid impact test of the compressor, thereby further determining the reliability of the liquid impact of the compressor. The invention adopts the following technical means: The liquid impact test device of the compressor comprises the compressor, a liquid storage device, data acquisition equipment, a computer and a strain gauge, wherein the strain gauge is arranged on a cross slip ring in the compressor and is connected with the data acquisition equipment through an inner and outer wiring terminal penetrating out of the compressor, and the data acquisition equipment is electrically connected with a motor; The compressor is characterized in that an exhaust pipe and an air suction pipe are respectively arranged above and below the compressor, the exhaust pipe is conn