CO2 transcritical cycle compressor performance testing device

Abstract

The utility model discloses a CO2 transcritical cycle compressor performance test device. A refrigerant outlet of a tested compressor is connected with an inlet of an exhaust throttle valve; an inlet of the oil separator is connected with an outlet of the exhaust throttle valve, a refrigerant outlet is connected with a first inlet of the heat regenerator through the first metering piece, and a refrigeration oil outlet is connected with a refrigerant inlet of the tested compressor sequentially through the second metering piece, the oil cooler and the third valve. A first outlet of the heat regenerator is connected with a condenser inlet, and a second outlet is connected with a heater inlet; an outlet of the condenser sequentially passes through a liquid storage device, a subcooler, a drying filter, a third metering part and a first valve and then is connected with a second inlet of the heat regenerator, so that refrigerants in high-pressure side systems from the exhaust throttle valve to the first valve and from the exhaust throttle valve to the second valve are in a subcritical state; the third metering piece is connected with the heater through the second valve; the heater is connected with a refrigerant inlet of the tested compressor. According to the utility model, the performance test can be carried out according to a subcritical test mode, and the withstand voltage requirement and the manufacturing cost of the device can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning, and in particular to a performance testing device for a CO2 transcritical cycle compressor. Background Technology

[0002] Traditional volumetric refrigeration compressor performance test benches are mainly based on a combination of two principles from the GB / T 5773 standard:

[0003] 1. The combined test scheme of the second refrigeration dose heater method and the liquid flow meter method has a large energy consumption and low test efficiency.

[0004] 2. A combined test scheme using the gas flow meter method and the gas cooler method. Although this scheme is energy-saving, it cannot perform combined tests of the compressor and the economizer.

[0005] Currently, CO2 compressor performance testing follows the transcritical cycle method proposed in GBT5773, which involves controlling the exhaust pressure with a gas cooler on the exhaust side. This results in the high-pressure side pressure being above the CO2 critical point. Therefore, the system requires higher pressure resistance from components and incurs higher costs during CO2 transcritical cycle compressor performance testing. Furthermore, when the throttling valve is used for transcritical throttling, the pressure difference across the valve is extremely large, making equipment selection difficult.

[0006] Therefore, there is an urgent need for a test device that has lower requirements for device withstand voltage and lower manufacturing cost compared to existing technologies, for testing the performance of CO2 transcritical cycle compressors. Utility Model Content

[0007] The utility model description section introduces a series of simplified concepts, all of which are simplifications of existing technologies in the field, and will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0008] The technical problem to be solved by this utility model is to provide a CO2 transcritical cycle compressor performance testing device that has lower pressure resistance requirements and lower manufacturing costs compared to existing technologies.

[0009] To solve the above-mentioned technical problems, the present invention provides a CO2 transcritical cycle compressor performance testing device, comprising:

[0010] The compressor under test 0 has its refrigerant outlet connected to the inlet of the exhaust throttle valve 1, meaning that the high-pressure CO2 discharged from it enters the exhaust throttle valve 1.

[0011] Exhaust throttle valve 1 is used to regulate the exhaust pressure of the compressor under test 0;

[0012] Oil separator 2, its inlet is connected to the outlet of exhaust throttle valve 1, its refrigerant outlet is connected to the first inlet of regenerator 4 via first metering element 3, and its refrigeration oil outlet is connected to the refrigerant inlet of compressor 0 under test via second metering element 14, oil cooler 15 and third valve 16 in sequence.

[0013] The regenerator 4 has its first outlet connected to the inlet of the condenser 5 and its second outlet connected to the inlet of the heater 12. The heat it uses to discharge from the compressor is used to offset the heat from the system evaporator, thus achieving energy saving in the test system.

[0014] The condenser 5, whose outlet sequentially passes through the liquid receiver 6, subcooler 7, dryer filter 8, third metering element 9 and first valve 10, is connected to the second inlet of the regenerator 4. It is used for refrigerant liquefaction, so that the refrigerant in the high-pressure side system of exhaust throttle valve 1 to first valve 10 and exhaust throttle valve 1 to second valve 11 is in a subcritical state.

[0015] Receiver 6 is used to store high-pressure side liquid refrigerant;

[0016] The subcooler 7 regulates the temperature of the refrigerant at its outlet by heat exchange on the gas-water side;

[0017] Dryer filter 8 is used to dry and filter refrigerant in the system;

[0018] The third metering element 9 is connected to the heater 12 via the second valve 11;

[0019] Heater 12 is connected to the refrigerant inlet of the compressor under test.

[0020] Preferably, the CO2 transcritical cycle compressor performance testing device is further improved by including:

[0021] Pressure fluctuation mitigation device 13 is connected to the refrigerant inlet of the compressor under test 0.

[0022] Preferably, in a further improved CO2 transcritical cycle compressor performance testing device, the first measuring element 3 is a gas flow meter, which is used to measure the refrigerant mass flow rate, and the result is one of the main results of the performance test.

[0023] Preferably, in a further improvement of the CO2 transcritical cycle compressor performance testing device, the second metering element 14 is an oil flow meter.

[0024] Preferably, in a further improved CO2 transcritical cycle compressor performance testing device, the third measuring element 9 is a liquid flow meter, which is used to measure the refrigerant mass flow rate, and the result is one of the main results of the performance test.

[0025] Preferably, in a further improved CO2 transcritical cycle compressor performance test device, the first valve 10 is a regenerative expansion valve, after which the refrigerant enters the regenerator 4 and exchanges heat with the refrigerant discharged from the compressor.

[0026] Preferably, in a further improved CO2 transcritical cycle compressor performance test device, the second valve 11 is a non-regenerative expansion valve. The refrigerant after the second valve 11 mixes with the refrigerant after the first valve 10 that enters the regenerator 4 and exits. By increasing the opening of this valve, the suction temperature of the compressor 0 under test can be reduced.

[0027] Preferably, in a further improvement to the CO2 transcritical cycle compressor performance testing device, the pressure fluctuation mitigation device 13 is a gas receiver used to buffer the CO2 gas in the system during shutdown, so as to achieve a balanced pressure that the system can withstand.

[0028] After being compressed by the compressor, the refrigerant is discharged, and the exhaust throttle valve reduces the exhaust pressure to a subcritical state, ensuring that the subsequent high-pressure side remains subcritical. The refrigerant enters the oil separator, where the almost oil-free refrigerant passes through a gas flow meter to measure its mass flow rate (this is the result of the gas flow meter method). It then enters one side of the regenerator for heat exchange and condensation, followed by complete condensation in the condenser. Afterward, it enters the receiver, subcooler, and dryer filter, and then a third liquid flow meter to measure its mass flow rate (this is the result of the liquid flow meter method). It flows through the first valve to reach the desired suction pressure, then enters the other side of the regenerator for evaporation and heat exchange. Finally, it mixes with the refrigerant flowing through the second valve and the heater to achieve the required suction temperature and pressure for the tested machine. Through the above structural design, the other parameter measurement points and switching valves included in this invention meet the requirements of GBT5773 performance testing and the automation requirements of the test, which will not be described in detail. Compared to existing technologies, this invention can perform performance testing according to the subcritical testing method, reducing the pressure resistance requirements of the components and manufacturing costs. Attached Figure Description

[0029] The accompanying drawings are intended to illustrate the general characteristics of the methods, structures, and / or materials used in specific exemplary embodiments of the present invention, supplementing the description in the specification. However, these drawings are schematic diagrams not drawn to scale and may not accurately reflect the precise structural or performance characteristics of any of the given embodiments. The drawings should not be construed as limiting or restricting the range of numerical values ​​or properties covered by the exemplary embodiments of the present invention. The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0030] Figure 1 This is a schematic diagram of the structure of the first embodiment of this utility model.

[0031] Figure 2 This is a schematic diagram of the structure of the first embodiment of this utility model.

[0032] Explanation of reference numerals in the attached figures

[0033] Compressor under test 0

[0034] Exhaust throttle valve 1

[0035] Oil separator 2

[0036] First measuring element 3

[0037] Regenerator 4

[0038] Condenser 5

[0039] 6. Liquid reservoir

[0040] Subcooler 7

[0041] Dryer filter 8

[0042] Third measuring element 9

[0043] First valve 10

[0044] Second valve 11

[0045] Heater 12

[0046] Pressure fluctuation relief device 13

[0047] Second measuring element 14

[0048] Oil cooler 15

[0049] Third valve 16. Detailed Implementation

[0050] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can fully understand other advantages and technical effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through different specific embodiments, and various details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. The following exemplary embodiments of this utility model can be implemented in many different forms and should not be construed as limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of this utility model thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art. It should be understood that when an element is referred to as "connected" or "combined" to another element, the element can be directly connected or combined to the other element, or there may be intermediate elements. The difference is that when an element is referred to as "directly connected" or "directly combined" to another element, there are no intermediate elements. Throughout the drawings, the same reference numerals always denote the same elements.

[0051] First embodiment;

[0052] refer to Figure 1 As shown, this utility model provides a CO2 transcritical cycle compressor performance testing device, comprising:

[0053] The compressor under test, 0, has its refrigerant outlet connected to the inlet of the exhaust throttle valve 1.

[0054] Exhaust throttle valve 1 is used to regulate the exhaust pressure of the compressor under test 0;

[0055] Oil separator 2, its inlet is connected to the outlet of exhaust throttle valve 1, its refrigerant outlet is connected to the first inlet of regenerator 4 via first metering element 3, and its refrigeration oil outlet is connected to the refrigerant inlet of compressor 0 under test via second metering element 14, oil cooler 15 and third valve 16 in sequence.

[0056] The regenerator 4 has its first outlet connected to the inlet of the condenser 5 and its second outlet connected to the inlet of the heater 12. The heat it uses to discharge from the compressor is used to offset the heat from the system evaporator.

[0057] The condenser 5, whose outlet sequentially passes through the liquid receiver 6, subcooler 7, dryer filter 8, third metering element 9 and first valve 10, is connected to the second inlet of the regenerator 4. It is used for refrigerant liquefaction, so that the refrigerant in the high-pressure side system of exhaust throttle valve 1 to first valve 10 and exhaust throttle valve 1 to second valve 11 is in a subcritical state.

[0058] The third metering element 9 is connected to the heater 12 via the second valve 11;

[0059] Heater 12 is connected to the refrigerant inlet of the compressor under test.

[0060] Among them, the first metering element 3 is a gas flow meter, the second metering element 14 is an oil flow meter, the third metering element 9 is a liquid flow meter, the first valve 10 is a regenerative expansion valve, and the second valve 11 is a non-regenerative expansion valve.

[0061] Furthermore, it should be understood that although the terms "first," "second," etc., may be used herein to describe different elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Therefore, without departing from the teachings of exemplary embodiments according to this utility model, the first element, component, region, layer, or portion discussed below may also be referred to as the second element, component, region, layer, or portion.

[0062] Second embodiment;

[0063] refer to Figure 2 As shown, this utility model provides a CO2 transcritical cycle compressor performance testing device, comprising:

[0064] The compressor under test, 0, has its refrigerant outlet connected to the inlet of the exhaust throttle valve 1.

[0065] Exhaust throttle valve 1 is used to regulate the exhaust pressure of the compressor under test 0;

[0066] Oil separator 2, its inlet is connected to the outlet of exhaust throttle valve 1, its refrigerant outlet is connected to the first inlet of regenerator 4 via first metering element 3, and its refrigeration oil outlet is connected to the refrigerant inlet of compressor 0 under test via second metering element 14, oil cooler 15 and third valve 16 in sequence.

[0067] The regenerator 4 has its first outlet connected to the inlet of the condenser 5 and its second outlet connected to the inlet of the heater 12. The heat it uses to discharge from the compressor is used to offset the heat from the system evaporator.

[0068] The condenser 5, whose outlet sequentially passes through the liquid receiver 6, subcooler 7, dryer filter 8, third metering element 9 and first valve 10, is connected to the second inlet of the regenerator 4. It is used for refrigerant liquefaction, so that the refrigerant in the high-pressure side system of exhaust throttle valve 1 to first valve 10 and exhaust throttle valve 1 to second valve 11 is in a subcritical state.

[0069] The third metering element 9 is connected to the heater 12 via the second valve 11;

[0070] Heater 12 is connected to the refrigerant inlet of the compressor under test;

[0071] Pressure fluctuation mitigation device 13 is connected to the refrigerant inlet of the compressor under test;

[0072] Among them, the first metering element 3 is a gas flow meter, the second metering element 14 is an oil flow meter, the third metering element 9 is a liquid flow meter, the first valve 10 is a regenerative expansion valve, the second valve 11 is a non-regenerative expansion valve, and the pressure fluctuation relief device 13 is a gas storage tank.

[0073] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that, unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having the meaning consistent with their meaning in the relevant field context, and not as having an idealized or overly formal meaning.

[0074] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the present invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A CO2 transcritical cycle compressor performance test device, characterized by, Comprises: a compressor (0) whose refrigerant outlet is connected to the inlet of a discharge throttle valve (1); a discharge throttle valve (1) for regulating the discharge pressure of the compressor (0); an oil separator (2) whose inlet is connected to the outlet of the discharge throttle valve (1), whose refrigerant outlet is connected to the first inlet of a recuperator (4) via a first metering device (3), and whose refrigerant oil outlet is connected to the refrigerant inlet of the compressor (0) via a second metering device (14), an oil cooler (15) and a third valve (16) in that order; a recuperator (4) whose first outlet is connected to the inlet of a condenser (5), whose second outlet is connected to the inlet of a heater (12), for balancing the heat of the compressor discharge with the heat of the system evaporator; a condenser (5) whose outlet is connected to the second inlet of the recuperator (4) via a liquid reservoir (6), a subcooler (7), a dry filter (8), a third metering device (9) and a first valve (10) in that order, for liquefying the refrigerant and bringing the refrigerant in the high pressure side system from the discharge throttle valve (1) to the first valve (10) and from the discharge throttle valve (1) to the second valve (11) to a subcritical state; a third metering device (9) which is connected to the heater (12) via a second valve (11); a heater (12) which is connected to the refrigerant inlet of the compressor (0).

2. The CO2 transcritical cycle compressor performance test device of claim 1, wherein, Further comprises: a pressure fluctuation mitigation device (13) which is connected to the refrigerant inlet of the compressor (0).

3. A CO2 transcritical cycle compressor performance test device according to claim 1 or 2, characterized in that: The first metering device (3) is a gas flow meter.

4. The CO2 transcritical cycle compressor performance test device of claim 1 or 2, characterized in that: The second metering device (14) is an oil flow meter.

5. The CO2 transcritical cycle compressor performance test device of claim 1 or 2, characterized in that: The third metering device (9) is a liquid flow meter.

6. The CO2 transcritical cycle compressor performance test device of claim 1 or 2, wherein: The first valve (10) is a recuperative expansion valve.

7. The CO2 transcritical cycle compressor performance test device of claim 1 or 2, wherein: The second valve (11) is a non-recuperative expansion valve.

8. The CO2 transcritical cycle compressor performance test device of claim 2, wherein: The pressure fluctuation mitigation device (13) is an accumulator.

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