CN115523130A - Method for evaluating reliability of compressor - Google Patents
Method for evaluating reliability of compressor Download PDFInfo
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- CN115523130A CN115523130A CN202211170949.7A CN202211170949A CN115523130A CN 115523130 A CN115523130 A CN 115523130A CN 202211170949 A CN202211170949 A CN 202211170949A CN 115523130 A CN115523130 A CN 115523130A
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- compressor
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- balance valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to a method for evaluating reliability of a compressor, and belongs to the technical field of detection. The method comprises the following steps: a. connecting a balance valve (4) and an expansion valve (5) in parallel and then connecting the balance valve and the expansion valve with an inlet and an outlet of a compressor (1), and opening the balance valve (4) for vacuumizing; b. adding a refrigerant, closing the balance valve (4) when the pressure reaches 0.3-0.45 MPa, and starting the compressor (1); c. adjusting the expansion valve (5) to ensure that the suction pressure reaches 0.55-0.6 MPa and the exhaust pressure reaches 1.5-1.7 MPa, and then shutting down; d. opening the balance valve (4), after the pressure is balanced, closing the balance valve (4), restarting the compressor (1), and repeating the step c; e. the compressor (1) components are inspected for shell opening. After the method is finished, the parts are directly checked, reliability evaluation is realized, the operation is simple and convenient, and the detection is fast. The problem that the reliability of mechanical parts of the compressor (1) cannot be effectively evaluated by the conventional compressor (1) service life test method is solved.
Description
Technical Field
The invention relates to a method for evaluating reliability of a compressor, and belongs to the technical field of compressor detection.
Background
In the production process of refrigerating appliances such as refrigerators, freezers and the like, a large amount of refrigerant needs to be filled into a compressor in a short time, and then the compressor is immediately powered on for starting test. After the system is filled with the refrigerant, a large amount of refrigerant is rapidly evaporated, the temperature of a core of the compressor is reduced, and the fit clearance of the compressor is changed. Meanwhile, the refrigerant is not volatilized to the refrigerating system, a large amount of liquid refrigerant is mixed in the refrigerant oil of the compressor, the viscosity of the refrigerant oil is reduced, and the formation of an oil film on the surface of a mechanical motion pair is not facilitated. At the moment, the compressor is started under the condition that the system pressure is not balanced, and the load of the compressor is increased; refrigerant oil mixed with a refrigerant is sucked into a compressor oil pumping system and then enters a kinematic pair, and the refrigerant cleans an oil film on the surface of the kinematic pair, so that the thickness of the oil film is reduced, even the oil film cannot be formed, and the lubricity of the compressor is deteriorated; under the simultaneous action of increased load and poor lubricity, the mechanical parts of the compressor are easily damaged, and the reliability of the mechanical parts of the compressor cannot be effectively evaluated by the conventional life test method.
Disclosure of Invention
The invention aims to solve the technical problem that the existing compressor service life test method cannot effectively evaluate the reliability of mechanical parts of the compressor.
The technical scheme adopted by the invention for solving the technical problem is as follows: a method of compressor reliability evaluation, comprising the steps of:
a. connecting a testing device, connecting the balance valve and the expansion valve in parallel, connecting the balance valve and the expansion valve with an inlet and an outlet of the compressor, opening the balance valve and vacuumizing the system;
b. adding a refrigerant, closing the balance valve when the balance pressure reaches 0.3-0.45 MPa, and starting the compressor;
c. adjusting the expansion valve to ensure that the suction pressure of the system reaches 0.55-0.6 MPa and the exhaust pressure reaches 1.5-1.7 MPa, and then shutting down the compressor;
d. opening the balance valve to balance the system pressure, closing the balance valve to restart the compressor, and repeating the step c;
e. the compressor mechanical parts are inspected for an open shell.
In the method, the inlet pipe and the outlet pipe of the compressor are respectively provided with an air suction pressure gauge and an exhaust pressure gauge.
Wherein, in the step a of the method, the system is vacuumized to-0.12 to-0.08 MPa.
Further, in the above method, the degree of vacuum in the step a is measured as a gauge pressure.
In the method, a refrigerant gas cylinder is adopted to add the refrigerant in the step b, and the refrigerant is in a liquid state R314a.
In the method, the inlet pipe and the outlet pipe of the compressor are respectively provided with a suction valve and an exhaust valve.
Wherein the pressure in step b and/or c in the above process is a gauge pressure.
Wherein, in the step d, the step c needs to be repeated for 1 or 2 times.
The beneficial effects of the invention are: the test method of the method is used for evaluating the reliability of mechanical parts of the compressor when the compressor is filled with large-flow or liquid refrigerant and the load is increased and the lubricating property is poor. Actually, through opening the compressor in succession and stopping, open the shell with the compressor after the experiment and inspect whether the part damages unusually or wearing and tearing, and then realized the aassessment to the compressor reliability, it has advantages such as easy and simple to handle, detect fast.
Drawings
Fig. 1 is a schematic diagram of the system connection structure of the present invention.
Labeled as: 1 is a compressor, 2 is an exhaust pressure gauge, 3 is an exhaust valve, 4 is a balance valve, 5 is an expansion valve, 6 is an intake valve, and 7 is an intake pressure gauge.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the method for evaluating the reliability of a compressor of the present invention includes the following steps:
a. connecting a testing device, connecting the balance valve 4 and the expansion valve 5 in parallel, connecting the balance valve 4 and the expansion valve with an inlet and an outlet of the compressor 1, opening the balance valve 4 and vacuumizing the system;
b. adding a refrigerant, closing the balance valve 4 when the balance pressure reaches 0.3-0.45 MPa, and starting the compressor 1;
c. adjusting the expansion valve 5 to ensure that the suction pressure of the system reaches 0.55-0.6 MPa and the exhaust pressure reaches 1.5-1.7 MPa, and then shutting down the compressor 1;
d. opening the balance valve 4 to balance the system pressure, closing the balance valve 4, restarting the compressor 1, and stopping the compressor 1 after repeating the step c;
e. the compressor 1 mechanical parts are inspected for open shells. The technical personnel in the field can understand that the method mainly comprises the steps of controlling the pressure in each step, not closing a gas cylinder in the test process, and simulating the damage condition of the compressor parts caused by immediately starting the compressor after a large amount of refrigerant is filled in a short time in the lift process of the refrigerator. In order to detect the loss condition of the cold start refrigerant of the compressor 1 to the internal components thereof, in order to simulate real start, the method firstly needs to be independently connected with a testing device, specifically, in the step a, the balance valve 4 and the expansion valve 5 are connected in parallel and then connected with the inlet and the outlet of the compressor 1, so that the inlet and the outlet of the compressor 1 are respectively communicated with the balance valve 4 and the expansion valve 5, and the balance valve 4 and the expansion valve 5 are mainly used for adjusting the pressure of the whole compressor system. Meanwhile, in order to ensure the refrigerant charging, the balance valve 4 is preferably opened and the system is vacuumized before the compressor is started, so that the whole testing device is in a negative pressure environment. Step b is mainly flushing in the refrigerant and starting the compressor 1. And c, adjusting the expansion valve 5 to enable the pressure of the inlet and the outlet of the compressor 1 to reach the working pressure, so that the test data is more real. And d, verifying the working condition of the compressor 1, and simultaneously repeating the step c to ensure the authenticity of the data. And e, directly adopting shell opening to check the damage degree of the compressor 1 part, and further judging whether the process requirement can be met.
Preferably, in the above method, the inlet and outlet pipes of the compressor 1 are respectively provided with a suction pressure gauge 7 and a discharge pressure gauge 2. As will be appreciated by those skilled in the art, in order to facilitate the measurement of the pressure in the inlet and outlet lines of the compressor 1, the method preferably provides a suction pressure gauge 7 and a discharge pressure gauge 2 on the inlet and outlet lines of the corresponding compressor 1.
Preferably, in the above method, the vacuum is applied in the step a to-0.12 to-0.08 MPa. As will be understood by those skilled in the art, in order to ensure the filling of the refrigerant, it is preferred to evacuate the vacuum in step a to-0.12 to-0.08 MPa
Preferably, in the above method, the degree of vacuum in the step a is measured as gauge pressure. As can be appreciated by those skilled in the art, in order to facilitate the display of the system vacuum level in a timely manner, the vacuum level can be actually measured directly using a vacuum gauge.
Preferably, in the above method, a refrigerant cylinder is used to add the refrigerant in step b, and the refrigerant is in a liquid state R314a. As can be understood by those skilled in the art, in order to fill the refrigerant, the method preferably uses a refrigerant gas cylinder to contain the refrigerant, so that the refrigerant gas cylinder is actually inverted, the pipe orifice of the refrigerant gas cylinder is connected with the interface of the testing device, the valve of the gas cylinder is opened, the liquid R134a refrigerant is filled into the refrigeration system, when the equilibrium pressure reaches 0.3-0.45 MPa, the equilibrium valve 4 is closed, then the compressor 1 is started to operate, and the gas cylinder is erected.
Preferably, in the above method, the inlet pipe and the outlet pipe of the compressor 1 are respectively provided with a suction valve 6 and a discharge valve 3. It will be appreciated by those skilled in the art that for the convenience of testing the suction and discharge of the apparatus, it is preferable to provide the suction valve 6 and the discharge valve 3 on the inlet and outlet pipes of the compressor 1, respectively.
Preferably, the pressure in step b and/or c in the above process is a gauge pressure. It will be appreciated by those skilled in the art that for convenience of pressure measurement, it is preferred that the equilibrium pressure and the suction and discharge pressures are both gauge pressures, as measured by pressure gauges.
Preferably, the step d in the above method is repeated 1 or 2 times. It will be appreciated by those skilled in the art that in order to facilitate the observation of the wear of the internal components of the compressor 1, the present method preferably repeats step c 1 or 2 times to simulate the actual operating conditions.
Example 1
The compressor 1 is connected with a testing device, the balance valve 4 and the expansion valve 5 are connected in parallel and then are connected with the inlet and the outlet of the compressor 1, and the balance valve 4 is opened to vacuumize to-0.1 MPa (gauge pressure). The cylinder is inverted, filled with liquid R134a refrigerant to achieve a equilibrium pressure of 0.43MPa (gauge pressure), the equalization valve 4 is closed, the compressor 1 is started, and the cylinder is erected. Adjusting an expansion valve 5 to enable the suction pressure of a system to reach 0.57MPa (gauge pressure), stopping the operation of a compressor 1 when the exhaust pressure reaches 1.6MPa (gauge pressure), opening a balance valve 4 to enable the pressure of the system to be balanced, enabling the balance pressure to be 0.60MPa (gauge pressure), closing the balance valve 4 to restart the compressor 1, adjusting the expansion valve 5 to enable the suction pressure of the system to reach 0.6MPa (gauge pressure), stopping the operation of the compressor 1 when the exhaust pressure reaches 1.68MPa (gauge pressure), opening a shell of the compressor 1 to check whether mechanical parts are abnormally damaged or worn, finding that an elastic pin is broken after the shell is opened, leading a small end of a connecting rod to be seriously worn by a piston pin, and enabling the wear to reach 5 levels.
Wherein, the part wear evaluation standard is qualified according to 0-5 grade and less than or equal to 3 grade, and the specific requirements are as follows:
0-look like new: no polishing, no signs of abrasion;
1-very slight abrasion: the local part has very slight polishing, the surface has no defect and no scratch;
2-slight abrasion: slight polishing and scratch are carried out in a small area, and the slightly damaged and abraded surface is smoother than the original surface;
3-moderate abrasion: moderate scratch, moderate polishing, no surface fracture, no scratch and no cutting mark;
4-slightly aggressive wear: moderate scratching, slight abrasive wear, slight scratching, heavy polishing, slight surface cracking;
5-aggressive severe wear: severe scratching, severe abrasive wear, scratching, chipping, surface cracking, surface damage, very severe burnishing, corrosion, adhesion.
Claims (8)
1. A method for reliability evaluation of a compressor, comprising the steps of:
a. the testing device is connected, the balance valve (4) and the expansion valve (5) are connected in parallel and then are connected with the inlet and the outlet of the compressor (1), the balance valve (4) is opened, and the system is vacuumized;
b. adding a refrigerant, closing the balance valve (4) when the balance pressure reaches 0.3-0.45 MPa, and starting the compressor (1);
c. adjusting the expansion valve (5) to make the system suction pressure reach 0.55-0.6 MPa and the exhaust pressure reach 1.5-1.7 MPa, and then shutting down the compressor (1);
d. opening the balance valve (4) to balance the system pressure, closing the balance valve (4), restarting the compressor (1), and repeating the step c;
e. the shell is opened to inspect the mechanical parts of the compressor (1).
2. A method of compressor reliability evaluation according to claim 1, wherein: and the inlet pipe and the outlet pipe of the compressor (1) are respectively provided with an air suction pressure gauge (7) and an air exhaust pressure gauge (2).
3. A method of compressor reliability evaluation according to claim 1, wherein: and (b) vacuumizing the system in the step a to-0.12 to-0.08 MPa.
4. A method of compressor reliability evaluation according to claim 3, wherein: the vacuum degree in the step a is measured as gauge pressure.
5. A method of compressor reliability evaluation according to claim 1, wherein: in the step b, a refrigerant gas cylinder is adopted to add the refrigerant, and the refrigerant is in a liquid state R314a.
6. A method of compressor reliability evaluation according to claim 1, wherein: and the inlet pipe and the outlet pipe of the compressor (1) are respectively provided with an air suction valve (6) and an air exhaust valve (3).
7. A method of compressor reliability evaluation according to claim 1, wherein: the pressure in step b and/or c is a gauge pressure.
8. A method of compressor reliability evaluation according to claim 1, wherein: in the step d, the step c needs to be repeated for 1 time or 2 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211170949.7A CN115523130A (en) | 2022-09-23 | 2022-09-23 | Method for evaluating reliability of compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211170949.7A CN115523130A (en) | 2022-09-23 | 2022-09-23 | Method for evaluating reliability of compressor |
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| Publication Number | Publication Date |
|---|---|
| CN115523130A true CN115523130A (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211170949.7A Pending CN115523130A (en) | 2022-09-23 | 2022-09-23 | Method for evaluating reliability of compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116221094A (en) * | 2023-02-27 | 2023-06-06 | 华能山东石岛湾核电有限公司 | Debugging method of supercharging diaphragm compressor |
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2022
- 2022-09-23 CN CN202211170949.7A patent/CN115523130A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116221094A (en) * | 2023-02-27 | 2023-06-06 | 华能山东石岛湾核电有限公司 | Debugging method of supercharging diaphragm compressor |
| CN116221094B (en) * | 2023-02-27 | 2024-01-23 | 华能山东石岛湾核电有限公司 | Debugging method of supercharging diaphragm compressor |
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