阅读说明：本技术 一种制冷剂气体循环方式的压缩机测试方法及系统 (Compressor testing method and system in refrigerant gas circulation mode ) 是由 向涵丰 于 2020-04-30 设计创作，主要内容包括：本发明提供了一种制冷剂气体循环方式的压缩机测试方法及系统,包括以下步骤：S1,压缩机排出第一气态制冷剂,一部分所述第一气态制冷剂经过冷凝,得到第一气液混合态制冷剂,另一部分所述第一气态制冷剂通过第一膨胀阀回流至所述压缩机；S2,步骤S1中所述的第一气液混合态制冷剂进行气液分离,得到第二气态制冷剂和第一液态制冷剂；所述第二气态制冷剂通过第二膨胀阀回流至所述压缩机,所述第一液态制冷剂通过第三膨胀阀回流至所述压缩机；其中,所述第一气态制冷剂、所述第二气态制冷剂和所述第一液态制冷剂先经过混合再回流至所述压缩机。相比于现有技术,本发明更加简单可靠,高效节能。(The invention provides a compressor testing method and a system in a refrigerant gas circulation mode, which comprises the following steps of: s1, discharging a first gaseous refrigerant by a compressor, condensing a part of the first gaseous refrigerant to obtain a first gas-liquid mixed state refrigerant, and refluxing the other part of the first gaseous refrigerant to the compressor through a first expansion valve; s2, performing gas-liquid separation on the first gas-liquid mixed refrigerant in the step S1 to obtain a second gas refrigerant and a first liquid refrigerant; the second gaseous refrigerant flows back to the compressor through a second expansion valve, and the first liquid refrigerant flows back to the compressor through a third expansion valve; wherein the first gaseous refrigerant, the second gaseous refrigerant, and the first liquid refrigerant are mixed and then returned to the compressor. Compared with the prior art, the invention is simpler and more reliable, and has high efficiency and energy saving.)

1. A method for testing a compressor in a refrigerant gas circulation mode is characterized by comprising the following steps of:

s1, discharging a first gas-state refrigerant by a compressor (1), condensing a part of the first gas-state refrigerant to obtain a first gas-liquid mixed-state refrigerant, and refluxing the other part of the first gas-state refrigerant to the compressor (1) through a first expansion valve (41);

s2, performing gas-liquid separation on the first gas-liquid mixed refrigerant in the step S1 to obtain a second gas refrigerant and a first liquid refrigerant; the second gaseous refrigerant is returned to the compressor (1) through a second expansion valve (42), and the first liquid refrigerant is returned to the compressor (1) through a third expansion valve (43);

wherein the first gaseous refrigerant, the second gaseous refrigerant and the first liquid refrigerant are mixed and then flow back to the compressor (1).

2. A method for testing a compressor in a refrigerant gas cycle according to claim 1, wherein the first liquid refrigerant is cooled and then returned to the compressor (1) through the third expansion valve (43).

3. The compressor testing system of the refrigerant gas circulation mode is characterized by comprising a compressor (1), a condenser (2), a liquid storage device (3) and an expansion valve (4), wherein the expansion valve (4) comprises a first expansion valve (41), a second expansion valve (42) and a third expansion valve (43);

wherein the compressor (1) is connected with the first expansion valve (41) to form a first closed loop; the compressor (1), the condenser (2), the liquid storage device (3) and the second expansion valve (42) are sequentially connected to form a second closed loop; the compressor (1), the condenser (2), the liquid storage device (3) and the third expansion valve (43) are sequentially connected to form a third closed loop; the first closed loop, the second closed loop and the third closed loop are mixed and then return to the compressor (1).

4. A refrigerant gas cycle compressor test system as claimed in claim 3 further comprising a mixer (5), said mixer (5) being connected to said compressor (1), said mixer (5) being disposed at the junction of said first closed circuit, said second closed circuit and said third closed circuit.

5. The refrigerant gas circulation-type compressor test system according to claim 3, further comprising a subcooler (6), wherein the subcooler (6) is disposed between the accumulator (3) and the third expansion valve (43).

6. A refrigerant gas cycle compressor test system as claimed in claim 3 further comprising an oil separator (7), said oil separator (7) being disposed between said compressor (1) and said condenser (2).

7. A refrigerant gas cycle compressor test system as claimed in claim 3, wherein said second expansion valve (42) is a pressure control expansion valve and said first expansion valve (41) and third expansion valve (43) are temperature control expansion valves.

8. A refrigerant gas cycle compressor test system as claimed in claim 3 wherein the height of said accumulator (3) is greater than the diameter of the floor of said accumulator (3).

9. A refrigerant gas circulation type compressor test system as claimed in claim 3, wherein a diameter of a pipe connecting said second expansion valve (42) with said accumulator (3) is larger than a diameter of a pipe connecting said third expansion valve (43) with said accumulator (3).

Technical Field

The invention relates to the field of compressor performance testing, in particular to a compressor testing method and system in a refrigerant gas circulation mode.

Background

The conventional compressor testing method generally uses a liquid refrigerant circulation method, that is, a method designed according to the most basic refrigeration cycle, and the piping layout shown in fig. 1 is based on the mollier diagram in fig. 2, and the basic flow is as follows:

1) a compressor sucks a refrigerant, compresses the refrigerant (a '-b' process), and discharges the refrigerant to a condenser;

2) the condenser cools the refrigerant to some extent (b '-c' process), typically to a sub-cooled state;

3) the expansion valve (EX.V) decompresses and expands the high-pressure liquid refrigerant to a low-temperature low-pressure gas-liquid mixed state (c '-d' process) and then enters the evaporator for evaporation;

4) the refrigerant after evaporating and absorbing heat returns to the suction port of the compressor again (d '-a' process) to carry out the next compression process.

In fig. 1, the broken line indicates a gaseous refrigerant, and the solid line indicates a liquid or gas-liquid mixed two-phase refrigerant. Conventional liquid refrigerant circulation methods still have certain drawbacks:

1) because the high-temperature and high-pressure refrigerant is condensed into a high-pressure liquid state, namely a supercooled state, the capacity of the condenser is generally selected to be 1.5-2.0 times of the mechanical load of the compressor according to the conventional liquid refrigerant circulation principle; the condenser selected in the mode is usually large in size, large in occupied area and high in energy consumption, so that the production cost is overhigh;

2) the conventional evaporator is generally in a type requiring external heat compensation, such as an air-cooled fin type or water-cooled plate type or double-pipe type heat exchanger, and the like, and the gas-liquid mixed refrigerant throttled by the expansion valve is overheated by means of the external heat compensation, so that the gas is completely converted into gas through evaporation, the overall energy consumption of the system is increased by external heat supply, and the production cost is further increased;

3) the conventional refrigeration cycle system only comprises an expansion valve, the air suction temperature of the compressor is heated by the compensation of the evaporator to be used as a heating side control end, the required compensation heat is larger when the refrigerating capacity of the compressor is larger, the energy consumption is very high, the size is larger, the reliability is lower, and the later-stage use cost is also very high.

In view of the above, it is necessary to provide a technical solution to the above problems.

Disclosure of Invention

One object of the present invention is: the method for testing the compressor in the refrigerant gas circulation mode is provided, and the problems that an existing refrigerating system in the liquid refrigerant circulation mode is complex, large in production energy consumption, low in reliability, high in later-stage use cost and the like are solved; the gas refrigerant circulation method has the advantages of simplicity, energy conservation, simple system and reliability.

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

a method for testing a compressor in a refrigerant gas circulation mode comprises the following steps:

s1, discharging a first gaseous refrigerant by a compressor, condensing a part of the first gaseous refrigerant to obtain a first gas-liquid mixed state refrigerant, and refluxing the other part of the first gaseous refrigerant to the compressor through a first expansion valve;

s2, performing gas-liquid separation on the first gas-liquid mixed refrigerant in the step S1 to obtain a second gas refrigerant and a first liquid refrigerant; the second gaseous refrigerant flows back to the compressor through a second expansion valve, and the first liquid refrigerant flows back to the compressor through a third expansion valve;

wherein the first gaseous refrigerant, the second gaseous refrigerant, and the first liquid refrigerant are mixed and then returned to the compressor.

The invention adopts three expansion valves to adjust the parameters of the compressor, and can be better matched with the test of various indexes of the compressor. Compared with the prior art, under the condition that the refrigerating capacity of the compressor is the same, the condensing process can adopt a small-capacity condenser to participate in circulation, the capacity and the volume of the adopted condenser can be reduced to 1/3 in the prior art, and correspondingly, the energy consumption at the position can be saved by at least 2/3; in addition, compared with the prior art, the circulation mode of the invention does not need an evaporator, namely, the gas-liquid mixed refrigerant throttled by the expansion valve is overheated without the help of external heat compensation, thereby reducing the auxiliary energy consumption of the evaporator and an external heat source and further saving the energy; in the gas-liquid separation process, the liquid storage device can be used for separation, and the energy consumption of the liquid storage device can be ignored. Therefore, compared with the traditional method, the method for testing the compressor in the refrigerant gas circulation mode greatly saves energy, and has a simple refrigeration system and high reliability.

In addition, two loops formed by the first expansion valve and the third expansion valve are added in the invention, so that the suction temperature of the compressor can be regulated and controlled together, the refrigerant of the first expansion valve is in a high-temperature state, and the refrigerant of the third expansion valve is in a low-temperature state. When the suction temperature requirement of the compressor is high, the valve of the first expansion valve can be opened to be large, and the valve of the third expansion valve can be closed to be small, so that the temperature of the refrigerant at the mixing position of the first expansion valve and the third expansion valve is high, and the suction temperature requirement of the compressor is met; conversely, when the suction temperature requirement of the compressor is low, the valve of the first expansion valve can be closed and the valve of the third expansion valve can be opened, so that the temperature of the refrigerant at the mixing position of the first expansion valve and the third expansion valve is low, and the suction temperature requirement of the compressor is met. Therefore, the compressor testing method adopting the gas refrigerant circulation mode can achieve the purpose of flexibly regulating and controlling the suction temperature.

Preferably, the first liquid refrigerant is cooled and then flows back to the compressor through the third expansion valve.

Another object of the present invention is to provide a system for testing a compressor in a refrigerant gas circulation manner, comprising a compressor, a condenser, a liquid reservoir, and expansion valves, wherein the expansion valves include a first expansion valve, a second expansion valve, and a third expansion valve;

the compressor is connected with the first expansion valve to form a first closed loop; the compressor, the condenser, the liquid storage device and the second expansion valve are sequentially connected to form a second closed loop; the compressor, the condenser, the liquid reservoir and the third expansion valve are sequentially connected to form a third closed loop; the first closed loop, the second closed loop, and the third closed loop are mixed first and then return to the compressor.

According to the compressor testing system adopting the refrigerant gas circulation mode, the three expansion valves are arranged to respectively control the three loops, the flexible regulation and control of the compressor parameters are realized through the synergistic effect of the three loops, and the problems of high energy consumption, complex system and poor reliability of the conventional compressor testing system are solved. Thanks to the first closed loop, a part of refrigerant gas is branched, so that the high-temperature and high-pressure refrigerant gas does not enter the condenser completely, the bearing pressure of the condenser is greatly reduced, and the selection of the condenser can be reduced to 1/3 in the aspects of capacity and volume. When the refrigerant in a gas-liquid mixed state condensed by the condenser is subjected to gas-liquid separation in the liquid storage device, most of the gas refrigerant is separated out and the second loop is closed through the second expansion valve, the gas refrigerant separated out by the liquid storage device is the most main factor influencing the suction pressure of the compressor, and the suction pressure required by the compressor can be controlled by regulating and controlling the second expansion valve. The liquid refrigerant separated by the liquid reservoir enters the third expansion valve to complete the closing of the third loop, the evaporation and heat absorption process is similar to that of the traditional evaporator, but the invention does not need an evaporator, namely, does not need external heat compensation to overheat the gas-liquid mixed refrigerant throttled by the expansion valve, thereby saving more energy. The refrigerants respectively discharged through the first expansion valve, the second expansion valve and the third expansion valve are mixed and then return to the compressor, and a basic refrigeration cycle is completed.

Therefore, compared with the traditional compressor testing system, the compressor testing system adopting the refrigerant gas circulation mode can regulate and control various parameters of the compressor more flexibly, has the advantages of simplicity, high efficiency, energy conservation, safety, stability and the like, and can be better applied to various testing systems of durability, service life, noise, operation and the like of the refrigeration compressors. However, due to the limitation of the characteristics, the compressor testing system is not provided with the evaporator and the external compensation heating, so that the compressor testing system cannot be suitable for heat exchanger tests of the heat exchanger and evaporator load tests of the automobile compressor, but generally speaking, the invention has excellent performance when being applied to most testing systems.

Preferably, the system for testing a compressor in a refrigerant gas circulation mode further comprises a mixer, the mixer is connected with the compressor, and the mixer is arranged at the mixing position of the first closed loop, the second closed loop and the third closed loop. In order to reduce the influence of a plurality of uncertain factors caused by overlong pipelines, the invention adds the arrangement of the mixer, and the refrigerants after being respectively throttled by the first expansion valve, the second expansion valve and the third expansion valve are fully and uniformly mixed in the mixer, so that the refrigerants reach the proper temperature required by the compressor and then enter the compressor to complete a cycle.

Preferably, the system for testing a compressor in a refrigerant gas circulation mode further comprises a subcooler, and the subcooler is arranged between the liquid reservoir and the third expansion valve.

Preferably, the refrigerant gas circulation type compressor test system further comprises an oil separator, and the oil separator is arranged between the compressor and the condenser.

Preferably, the second expansion valve is a pressure control expansion valve, and the first expansion valve and the third expansion valve are temperature control expansion valves.

Preferably, the height of the reservoir is greater than the diameter of the bottom surface of the reservoir.

Preferably, a diameter of a pipe connecting the second expansion valve and the reservoir is larger than a diameter of a pipe connecting the third expansion valve and the reservoir.

The invention has the beneficial effects that:

1) the invention provides a method for testing a compressor in a refrigerant gas circulation mode, which adopts three expansion valves to adjust the parameters of the compressor, and compared with the prior method, under the condition that the refrigeration capacity of the compressor is the same, the method can adopt a small-capacity condenser to participate in the circulation in the condensation process, the capacity and the volume of the adopted condenser can be reduced to the conventional 1/3, and correspondingly, the energy consumption at the position can be at least saved by 2/3; in addition, the circulation method does not need an evaporator, namely, the air suction temperature of the compressor is controlled without external compensation heating, so that the energy consumption of the evaporator and the external compensation heating is reduced, and the energy is further saved; the energy consumed in the gas-liquid separation process of the test method can be ignored. Therefore, compared with the traditional liquid refrigerant circulation method, the testing method of the invention greatly saves energy, and has simple process and high reliability.

2) The invention also provides a compressor testing system adopting the refrigerant gas circulation mode, and by adopting the testing method of the refrigerant gas circulation mode, an evaporator and external compensation heating are not needed, so that the energy is saved, the later use cost and maintenance cost of the equipment are greatly reduced, the integral volume of the system is reduced, and the occupied area of the equipment is reduced.

3) The liquid accumulator arranged in the system enables the system to have the function of automatically adjusting the refrigerant charge amount, and in the actual production, the operation of the system cannot be influenced by adding a plurality of or few refrigerants; the refrigerant charge of the system can be accurately judged through the arrangement of the liquid level meter, and therefore the optimal charge of the system is obtained.

4) Compared with the traditional compressor test system, the compressor test system adopting the refrigerant gas circulation mode has the advantages that the absolute amount of the refrigerant required by the compressor test system is reduced, the system can be quickly and correspondingly stabilized, and the system can be better applied to various test systems of durability, service life, noise, operation and the like of the refrigeration compressor.

5) The refrigeration system of the system is simple and high in reliability, and can be expanded in function according to actual production requirements, for example, an oil separator and a flowmeter can be additionally arranged, and the system can be expanded to be used by a compressor calorimeter; and various devices such as an intercooler and the like can be added, so that the device can be better applied to other performance tests of various refrigeration compressors.

Drawings

Fig. 1 is a schematic structural diagram of a conventional compressor testing system.

Fig. 2 is a mollier diagram corresponding to a conventional refrigerant cycle.

Fig. 3 is a schematic structural diagram of a compressor testing system according to the present invention.

Fig. 4 is a second schematic structural diagram of a compressor testing system according to the present invention.

Fig. 5 is a mollier diagram corresponding to the refrigerant cycle of the present invention.

In the figure: 1' -a compressor; 2' -a condenser; 3' -a reservoir; 4' -an expansion valve; 5' -an evaporator; 6' -a subcooler; 1-a compressor; 2-a condenser; 3-a liquid reservoir; 4-an expansion valve; 41-a first expansion valve; 42-a second expansion valve; 43-a third expansion valve; 5-a mixer; 6-a subcooler; 7-oil separator.

Wherein Ps in the graph is the suction pressure; ts is the suction temperature; pd is exhaust pressure; td is the exhaust temperature.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.