Throttle valve refrigerant flow characteristic test system
The throttle valve refrigerant flow characteristic test system addresses inefficiencies in existing methods by separating and controlling refrigerant phases, reducing energy waste and enhancing accuracy in throttle valve testing.
Patent Information
- Application Number
- CN202420540280.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-19
AI Technical Summary
Existing throttle valve performance testing methods in refrigeration systems suffer from large deviations due to differences in physical properties between nitrogen and refrigerants, leading to energy wastage and inefficiency.
A throttle valve refrigerant flow characteristic test system that separates refrigerant into gas and liquid phases, using a compressor and pump to pressurize and mix them, reducing energy consumption by minimizing heat exchange and simplifying the system.
The system achieves energy savings and high control accuracy by controlling refrigerant flow characteristics, eliminating evaporators, and ensuring stable operation.
Smart Images
Figure CN222188803U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of throttle valve performance testing for refrigeration systems, in particular to a throttle valve refrigerant flow characteristic testing system. Background Art
[0002] With the development of refrigeration technology, the optimization of refrigeration systems for the purpose of saving energy and improving comfort has received attention. As an important component of system regulation, the performance of the throttle valve has received more attention. In particular, the extensive use of electronic expansion valves requires in-depth research on their performance. Traditional test experimental systems use nitrogen methods, actual refrigeration system methods, liquid ring methods, etc. There are relatively large differences in physical properties between nitrogen and refrigerants, and there are large deviations; the actual refrigeration system needs to heat and evaporate the unevaporated refrigerant and then condense it into liquid, which consumes a lot of energy during the test process. The liquid ring method requires the gas refrigerant flashed out by the throttling to be condensed into liquid refrigerant, and then pumped to the high-pressure stage to heat the liquid refrigerant to increase its temperature, which wastes energy. Utility Model Content
[0003] The utility model discloses a throttle valve refrigerant flow characteristic test system, which separates the two-phase refrigerant after passing through the throttle valve, and the liquid refrigerant is pressurized to the high-pressure side by a liquid refrigerant pump, and the gas refrigerant is compressed to the high-pressure side by a compressor. The refrigerant gas and liquid on the high-pressure side are mixed and then enter the condenser, and then pass through a subcooler and a flow meter to enter the throttle valve to be tested. The refrigerant gas and liquid are controlled separately, which can reduce repeated heat exchange, fully utilize energy, and is simple to operate and stable to control.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:
[0005] The utility model discloses a throttle valve refrigerant flow characteristic test system, comprising a throttle valve to be tested, wherein two sides of the throttle valve are respectively connected with a pressure sensor, a temperature sensor and an automatic ball valve, wherein the automatic ball valve on one side is connected with a flow meter, the flow meter is connected with an inlet liquid separation pipe, the automatic ball valve on the other side is connected with an outlet liquid collecting pipe, the inlet liquid separation pipe is connected with a subcooler, a liquid storage device and a condenser in sequence, the condenser is connected with an exhaust check valve and a liquid refrigerant check valve, the liquid refrigerant check valve is connected with a refrigerant liquid pump, the refrigerant liquid pump is connected with a gas-liquid separator, the exhaust check valve is connected with an exhaust throttle valve and an oil separator, the oil separator is connected with a compressor, and the compressor is connected with the gas-liquid separator.
[0006] Furthermore, a liquid level switch and a pressure sensor are installed at the gas-liquid separator.
[0007] Furthermore, an auxiliary control throttle valve is installed between the outlet collecting pipe and the inlet distributing pipe.
[0008] Furthermore, a liquid level gauge is provided in the liquid reservoir.
[0009] Furthermore, a pressure sensor and a temperature sensor are provided on the connecting pipe between the inlet liquid dispensing pipe and the supercooler.
[0010] Furthermore, a pressure sensor and a temperature sensor are provided on the connecting pipeline between the gas-liquid separator and the compressor.
[0011] Furthermore, the liquid level gauge is an electronic liquid level gauge, which is used to measure the liquid level height of the refrigerant in the liquid storage tank. The liquid level gauge is connected to a PID controller, and the PID controller is a hot and cold type. The hot end of the PID controller is used to control the refrigerant liquid pump, and the cold end is used to control the auxiliary control throttle valve. The refrigerant liquid level in the liquid storage tank is controlled to remain unchanged by adjusting the rate of refrigerant entering and flowing out of the liquid storage tank.
[0012] Furthermore, an exhaust throttle valve is arranged between the oil separator and the gas-liquid separator. The exhaust throttle valve is an electronic throttle valve. The pressure of the outlet pressure sensor of the valve to be tested is controlled by the exhaust throttle valve.
[0013] The beneficial effects of the utility model are:
[0014] The utility model pressurizes the gas refrigerant after throttling by the throttle valve through a compressor, and then fully mixes it with the liquid after throttling by the throttle valve after pressurization by a pump, which can reduce the condensation heat after the compressor condenses and achieve the purpose of energy saving. The outlet pressure of the valve to be measured is directly controlled by the compressor exhaust throttle valve, the evaporator is eliminated, and the original system is simplified. The control of the liquid level meter of the liquid storage device ensures the stability and sustainability of the system control. The system has the advantages of energy saving, simple system and high control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0016] Figure 1 It is a schematic structural diagram of an embodiment of the utility model.
[0017] Figure 2 This is a schematic diagram of a water cooling system according to an embodiment of the present utility model.
[0018] Figure 3 This is a control schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION
[0019] The technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the utility model.
[0020] As shown in the figure, the utility model discloses a throttle valve refrigerant flow characteristic test system, including a throttle valve 1 to be tested, a pressure sensor 2, a temperature sensor 3 and an automatic ball valve 4 are respectively connected to the two sides of the throttle valve 1, wherein the automatic ball valve 4 on one side is connected to a flow meter 5, the flow meter 5 is connected to an inlet liquid separator 6, the automatic ball valve 4 on the other side is connected to an outlet collecting pipe 7, the inlet liquid separator 6 is connected to a subcooler 8, a liquid storage device 9 and a condenser 10 in sequence, the condenser 10 is connected to an exhaust check valve 11 and a liquid refrigerant check valve 12, the liquid refrigerant check valve 12 is connected to a refrigerant liquid pump 13, the refrigerant liquid pump 13 is connected to a gas-liquid separator 14, the exhaust check valve 11 is connected to an exhaust throttle valve 15 and an oil separator 16, the oil separator 16 is connected to a compressor 17, and the compressor 17 is connected to the gas-liquid separator 14.
[0021] The refrigerant after throttling by the throttle valve 1 to be tested is divided into liquid refrigerant and gas refrigerant in the gas-liquid separator 14. The liquid refrigerant is pressurized by the refrigerant liquid pump 13 and the gas refrigerant is compressed by the compressor and mixed into the condenser 10. The outlet of the condenser 10 is connected to the subcooler 8, and the liquid refrigerant is throttled after being subcooled to the required temperature. The outlet of the subcooler is connected to the flow meter 5, and the refrigerant flow characteristics of the throttle valve are tested under the premise of reaching the test throttle valve working condition.
[0022] In an embodiment of the present utility model, a liquid level switch 18 and a pressure sensor 2 are installed at the gas-liquid separator 14 .
[0023] In an embodiment of the present utility model, an auxiliary control throttle valve 19 is installed between the outlet liquid collecting pipe 7 and the inlet liquid distributing pipe 6 .
[0024] In one embodiment of the present invention, a liquid level meter 20 is provided in the liquid reservoir 9 .
[0025] In one embodiment of the utility model, a pressure sensor and a temperature sensor are provided on the connecting pipe between the inlet liquid distribution pipe 6 and the supercooler 8 .
[0026] In an embodiment of the present invention, a pressure sensor and a temperature sensor are provided on the connecting pipeline between the gas-liquid separator 14 and the compressor 17 .
[0027] A liquid collecting pipe is arranged at the outlet of the throttle valve 1 to be tested, which can be used for testing multiple throttle valves at the same time to ensure that all outlet pressures are simultaneously controlled within the allowable deviation range of the set pressure.
[0028] An inlet liquid distribution pipe is arranged at the inlet of the throttle valve 1, which can be used for testing multiple throttle valves at the same time to ensure that all inlet pressures are controlled to the set pressure at the same time.
[0029] The exhaust throttle valve 15 is an electronic throttle valve, and the pressure of the outlet pressure sensor of the valve under test is controlled by the exhaust throttle valve 15 .
[0030] A liquid refrigerant check valve is installed at the outlet of the refrigerant liquid pump; an exhaust check valve is installed at the outlet of the oil separator. The superheated refrigerant gas at the oil separator outlet and the supercooled refrigerant liquid at the pump outlet are fully mixed and then enter the condenser.
[0031] In one embodiment of the utility model, the liquid level meter is an electronic liquid level meter, which is used to measure the liquid level height of the refrigerant in the liquid reservoir. The liquid level meter is connected to a PID controller, and the PID controller is a hot and cold type. The hot end of the PID controller is used to control the refrigerant liquid pump, and the cold end is used to control the auxiliary control throttle valve. The refrigerant liquid level in the liquid reservoir is controlled to remain unchanged by adjusting the rate at which the refrigerant enters and flows out of the liquid reservoir.
[0032] The control principle and refrigeration cycle are:
[0033] The inlet pressure control method of the tested valve is as follows: After the refrigerant passes through the tested throttle valve, it is separated into refrigerant liquid and refrigerant gas in the gas-liquid separator. The refrigerant liquid is pressurized and transported to the condenser inlet by the refrigerant liquid pump. The refrigerant gas is compressed by the compressor and then separated into the refrigerant lubricating oil by the oil separator and mixed with the refrigerant liquid. After mixing, the refrigerant is in a gas-liquid two-phase state. The refrigerant continues to condense in the condenser. The condenser is water-cooled. Its water system is as follows: Figure 2 The constant temperature water tank has a temperature control system that can stabilize the water at a constant temperature and can set the required temperature. The condensing water pump and the condenser are connected in series. By adjusting the size of the condensing valve switch, the water temperature in the condenser is changed, thereby changing the heat exchange temperature difference and controlling the condensing pressure. The control system is shown in Figure 3 The input of the PID controller is the pressure sensor at the inlet of the valve under test, and the output is the condensation valve, which is electrically regulated.
[0034] The inlet temperature control method of the tested valve is as follows: the refrigerant enters the liquid storage tank after condensation, and the outlet of the liquid storage tank is connected to the subcooler, which is water-cooled. Figure 2The subcooling water pump and the subcooler are connected in series. By adjusting the switch size of the subcooling valve, the water temperature in the subcooler is changed, thereby changing the heat exchange temperature difference and controlling the inlet temperature of the valve under test. The control system is shown in Figure 3 The input of the PID controller is the inlet temperature sensor of the valve under test, and the output is the subcooling valve, which is electrically regulated.
[0035] The outlet pressure control method of the tested valve is as follows: the refrigerant at the oil separator outlet is throttled by the exhaust throttle valve and then passed into the gas-liquid separator. The gas-liquid separator is provided with a liquid level switch. The compressor exhaust refrigerant pipe after decompression is passed below the liquid level. The superheated refrigerant and the refrigerant in the gas-liquid separator fully exchange heat and evaporate saturated refrigerant gas under low pressure. This gas is sucked into the compressor together with the gas of the tested throttle valve and compressed to the high pressure side. Its control system is shown in Figure 3 The input of the PID controller is the outlet pressure sensor of the valve under test, and the output is the exhaust throttle valve, which is an electric valve.
[0036] The control method of the liquid level gauge of the liquid accumulator is as follows: a liquid level gauge is set in the liquid accumulator to control the distribution of the high-pressure and low-pressure refrigerant. Figure 3 The input of the PID controller is the liquid level gauge of the liquid reservoir, the output of the hot end controls the inverter of the refrigerant liquid pump, and the output of the cold end controls the auxiliary control throttle valve. The refrigerant liquid in the gas-liquid separator is pressurized by the refrigerant liquid pump and reaches the liquid reservoir. The inverter output frequency of the refrigerant liquid pump increases, the speed of the refrigerant liquid pump increases, and the liquid level of the liquid level gauge of the liquid reservoir increases. The auxiliary control throttle valve is arranged between the liquid reservoir and the gas-liquid separator. The auxiliary control throttle valve is an electric regulating valve. When its opening is widened, the liquid level of the liquid level gauge of the liquid reservoir decreases.
[0037] When the flow rate of the throttle valve under test is small, the refrigerant liquid pump may not be turned on and the control scheme remains unchanged.
[0038] If multiple stations need to be measured and operated simultaneously, multiple test stations can also be expanded between the outlet collecting pipe and the inlet dispensing pipe.
[0039] The utility model utilizes the physical properties of the refrigerant combined with the law of conservation of energy to minimize the heat load and input power of the system and improve the test energy efficiency. In addition, it has the advantages of stable system operation and high measurement accuracy.
[0040] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. Throttle valve refrigerant flow characteristics test system, It is characterized in that It includes a throttle valve to be tested, and pressure sensors, temperature sensors and automatic ball valves are respectively connected to both sides of the throttle valve, wherein the automatic ball valve on one side is connected to a flow meter, the flow meter is connected to an inlet liquid separation pipe, the automatic ball valve on the other side is connected to an outlet collecting pipe, the inlet liquid separation pipe is connected to a subcooler, a liquid storage device and a condenser in sequence, the condenser is connected to an exhaust check valve and a liquid refrigerant check valve, the liquid refrigerant check valve is connected to a refrigerant liquid pump, the refrigerant liquid pump is connected to a gas-liquid separator, the exhaust check valve is connected to an exhaust throttle valve and an oil separator, the oil separator is connected to a compressor, and the compressor is connected to a gas-liquid separator.
2. According to the throttle valve refrigerant flow characteristic testing system of claim 1, It is characterized in that A liquid level switch and a pressure sensor are installed at the gas-liquid separator.
3. According to the throttle valve refrigerant flow characteristic testing system of claim 1, It is characterized in that An auxiliary control throttle valve is installed between the outlet collecting pipe and the inlet distributing pipe.
4. According to claim 3, the throttle valve refrigerant flow characteristic testing system, It is characterized in that A liquid level gauge is provided in the liquid reservoir.
5. According to claim 1, the throttle valve refrigerant flow characteristic testing system, It is characterized in that A pressure sensor and a temperature sensor are arranged on the connecting pipe between the inlet liquid dispensing pipe and the supercooler.
6. The throttle valve refrigerant flow characteristic testing system according to claim 1, It is characterized in that A pressure sensor and a temperature sensor are arranged on the connecting pipeline between the gas-liquid separator and the compressor.
7. The throttle valve refrigerant flow characteristic testing system according to claim 4, It is characterized in that The liquid level gauge is an electronic liquid level gauge, which is used to measure the liquid level height of the refrigerant in the liquid storage tank. The liquid level gauge is connected to the PID controller, which is a hot and cold type. The hot end of the PID controller is used to control the refrigerant liquid pump, and the cold end is used to control the auxiliary control throttle valve. The refrigerant liquid level in the liquid storage tank is controlled to remain unchanged by adjusting the rate of refrigerant entering and flowing out of the liquid storage tank.
8. The throttle valve refrigerant flow characteristic testing system according to claim 1, It is characterized in that An exhaust throttle valve is arranged between the oil separator and the gas-liquid separator. The exhaust throttle valve is an electronic throttle valve. The pressure of the outlet pressure sensor of the valve to be tested is controlled by the exhaust throttle valve.