A mass flow regulating system for carbon dioxide as a coolant

Abstract

The utility model discloses a quality flow regulation system when carbon dioxide is refrigerant, which is used in heat pump, and it includes heater, pressure sensor, temperature sensor, pressure relief valve and the gas storage tank with import and export, the gas storage tank is used to fill in carbon dioxide, the heating end of heater is established in the gas storage tank, the first connecting pipe is arranged in one side of gas storage tank and is connected with its inside, the pressure sensor, temperature sensor and pressure relief valve are connected outwardly in proper order on the first connecting pipe, temperature sensor can be used for detecting the temperature of carbon dioxide in the gas storage tank, to avoid the heater when working excessive heating carbon dioxide and cause the pressure in the gas storage tank to exceed the preset pressure value, the utility model discloses can automatically adjust the pressure in the gas storage tank, to guarantee the pressure stability of carbon dioxide refrigerant in its inside, and then can guarantee the stability of carbon dioxide refrigerant supply and recovery of heat pump, realizes the pressure in stable carbon dioxide refrigerant circulating system finally.

Description

Technical Field

[0001] This utility model relates to the field of refrigerant quality regulation and control technology when a heat pump drives refrigerant circulation, specifically to a mass flow rate regulation system when carbon dioxide is used as the refrigerant. Background Technology

[0002] Currently, heat pumps generally use a gas storage tank, whose main function is to provide and recover refrigerant for the heat pump. For example, CN116592505A discloses an integrated fresh air conditioner using carbon dioxide as refrigerant and its cooling and heating methods. Specifically, this integrated fresh air conditioner using carbon dioxide as refrigerant includes an air source heat pump unit, a booster compressor, a storage tank, and a heat exchanger that cooperate with each other; it also includes a casing and a blower fan. The air source heat pump unit, booster compressor, and storage tank are correspondingly installed in a first inner cavity of the casing, and the first inner cavity is provided with a first air inlet and a first air outlet. The heat exchanger and the blower fan are sequentially arranged in a second inner cavity, and the second inner cavity is provided with a second air inlet and a second air outlet. The blower fan is used to blow air around the heat exchanger to the second air outlet.

[0003] However, current gas storage technology still has some drawbacks in its use. For example, the pressure of the current gas storage tank is the same as that of the carbon dioxide refrigerant circulation system. Furthermore, the gas-liquid ratio in the storage tank changes due to variations in ambient temperature, causing pressure fluctuations in the carbon dioxide refrigerant circulation system. Existing gas storage tanks are generally unable to stabilize the pressure in the carbon dioxide refrigerant circulation system, potentially leading to pressure instability. Specifically, the instability of the carbon dioxide refrigerant pressure within the storage tank itself results in unstable carbon dioxide refrigerant supply and recovery in the heat pump, ultimately affecting the pressure stability of the carbon dioxide refrigerant circulation system. Utility Model Content

[0004] To address the problems existing in the prior art, the purpose of this utility model is to provide a mass flow rate regulation system for carbon dioxide as a refrigerant. By installing components such as a heater, pressure sensor, temperature sensor, and pressure relief valve on the gas storage tank, it can automatically adjust the pressure inside the gas storage tank to ensure the pressure stability of the internal carbon dioxide refrigerant. This, in turn, ensures the stability of the carbon dioxide refrigerant supply and recovery in the heat pump, and ultimately achieves stable pressure in the carbon dioxide refrigerant circulation system.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A mass flow rate regulation system using carbon dioxide as a refrigerant, for use in a heat pump, includes a heater, a pressure sensor, a temperature sensor, a pressure relief valve, and a high-pressure storage tank with inlet and outlet. The storage tank is used to hold carbon dioxide. The heating end of the heater is located inside the storage tank. A first connecting pipe is provided on one side of the storage tank and connected to its interior. The pressure sensor, temperature sensor, and pressure relief valve are sequentially connected outward from the first connecting pipe. The temperature sensor is used to detect the temperature of the carbon dioxide inside the storage tank to prevent the heater from overheating the carbon dioxide during operation, which could cause the pressure inside the storage tank to exceed a preset pressure value. Before system startup, with the heater off, when the pressure sensor senses that the pressure in the storage tank is higher than the preset pressure value set by the system, the pressure relief valve opens to release air until the pressure inside the storage tank reaches the preset pressure value. The pressure relief valve is closed. During system startup, when the pressure sensor detects that the pressure in the gas storage tank is lower than the preset pressure value, the heater starts and heats the carbon dioxide in the gas storage tank. The heater operates until the pressure in the gas storage tank exceeds the preset value or the carbon dioxide temperature in the gas storage tank reaches the preset value, then it shuts off. When the temperature sensor detects that the carbon dioxide has been heated to the preset temperature but the pressure in the gas storage tank is still lower than the preset pressure value, the system shuts off the heater and ends the startup procedure. The system also issues a carbon dioxide leakage signal, at which point the system malfunctions and cannot start. During system startup and shutdown, the pressure in the gas storage tank must be higher than the preset pressure value. When the pressure in the gas storage tank falls below the preset pressure value, the system issues a carbon dioxide shortage signal to remind the system to replenish the gas storage tank. The system can then continue operating. These settings automatically adjust the pressure in the gas storage tank.

[0007] Furthermore, it also includes a safety valve; the safety valve is connected to the inside of the gas storage tank via a second connecting pipe; when the system is not in operation, when the pressure inside the gas storage tank exceeds the safe pressure value, the safety valve is opened by carbon dioxide and releases a certain amount of carbon dioxide until the pressure inside the gas storage tank reaches the safe pressure value, at which point the safety valve closes. The safety valve improves the safety of the gas storage tank by providing a safety valve.

[0008] Furthermore, the pressure relief valve is an electronic control valve; the safety valve is a spring-loaded control valve.

[0009] Furthermore, the safety pressure value of the safety valve is 13 MPa, and the preset pressure value of the pressure relief valve is 7.3 MPa-13 MPa.

[0010] Furthermore, it also includes a manual valve; the manual valve is connected to the interior of the gas storage tank via a third connecting pipe; when the carbon dioxide in the gas storage tank is insufficient, carbon dioxide can be added to the gas storage tank through the manual valve. The manual valve allows for convenient addition of carbon dioxide refrigerant.

[0011] Furthermore, a fourth connecting pipe and a fifth connecting pipe, respectively, connecting to the interior of the gas storage tank are provided at the inlet and outlet of the gas storage tank; an electrically controlled valve is provided on the fourth connecting pipe and the fifth connecting pipe. This arrangement facilitates the control of carbon dioxide supply and recovery.

[0012] Furthermore, when the heater is working, the maximum temperature of the carbon dioxide in the gas storage tank after being heated by the heater is set to 40°C; when the temperature sensor senses that the temperature of the carbon dioxide in the gas storage tank exceeds 40°C, the heater stops working.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention automatically adjusts the pressure inside the gas storage tank by installing components such as a heater, pressure sensor, temperature sensor, and pressure relief valve on the gas storage tank, thereby ensuring the pressure stability of the carbon dioxide refrigerant inside, which in turn ensures the stability of the carbon dioxide refrigerant supply and recovery in the heat pump, and ultimately achieves stable pressure in the carbon dioxide refrigerant circulation system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure Labels

[0017] 1. Heater; 2. Pressure sensor; 3. Temperature sensor; 4. Pressure relief valve; 5. Gas tank; 6. Safety valve; 7. Manual valve; 8. Electric control valve; 9. First connecting pipe; 10. Second connecting pipe; 11. Third connecting pipe; 12. Fourth connecting pipe; 13. Fifth connecting pipe. Detailed Implementation

[0018] The utility model will be further described below with reference to the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the scope of protection of the utility model.

[0019] like Figure 1 As shown, a mass flow rate regulation system using carbon dioxide as a refrigerant is used in a heat pump (not shown). It includes a heater 1, a pressure sensor 2, a temperature sensor 3, a pressure relief valve 4, and a gas storage tank 5 with an inlet and an outlet and capable of withstanding high pressure. The gas storage tank 5 is used to store carbon dioxide.

[0020] The heating end of the heater 1 is located inside the gas storage tank 5; a first connecting pipe 9 connected to the inside of the gas storage tank 5 is provided on one side of the gas storage tank 5, and a pressure sensor 2, a temperature sensor 3 and a pressure relief valve 4 are connected outward from the first connecting pipe 9 in sequence.

[0021] Temperature sensor 3 can be used to detect the temperature of carbon dioxide in gas storage tank 5, so as to prevent heater 1 from overheating carbon dioxide during operation and causing the pressure in gas storage tank 5 to exceed the preset pressure value, thus ensuring the safe use of gas storage tank 5.

[0022] Specifically, before the system starts up and runs, when the heater 1 is not turned on, when the pressure sensor 2 senses that the pressure in the gas storage tank 5 is higher than the preset pressure value set by the system, the pressure relief valve 4 opens to release gas until the pressure in the gas storage tank 5 reaches the preset pressure value, and then the pressure relief valve 4 closes.

[0023] When the system starts up, if pressure sensor 2 detects that the pressure inside the gas storage tank 5 is lower than the preset pressure value, heater 1 starts and heats the carbon dioxide inside the gas storage tank 5. Heater 1 operates until the pressure inside the gas storage tank 5 exceeds the preset value or the temperature of the carbon dioxide inside the gas storage tank 5 reaches the preset value, then it shuts down. If temperature sensor 3 detects that the carbon dioxide has been heated to the preset temperature but the pressure inside the gas storage tank 5 is still lower than the preset pressure value, the system shuts down heater 1 and ends the startup procedure. The system also issues a signal indicating a carbon dioxide leak, at which point the system malfunctions and cannot start. In this embodiment, the maximum temperature of the carbon dioxide in the gas storage tank 5 after being heated by heater 1 is set to 40°C. When temperature sensor 3 detects that the temperature of the carbon dioxide in the gas storage tank 5 exceeds 40°C, heater 1 stops operating to ensure that the carbon dioxide is not overheated.

[0024] When the system starts up and stops, the pressure inside the gas storage tank 5 needs to be higher than the preset pressure value. When the pressure inside the gas storage tank 5 is lower than the preset pressure value, the system sends a signal that the carbon dioxide is insufficient to remind that carbon dioxide needs to be added to the gas storage tank 5. At this time, the system can continue to operate, and the gas storage tank 5 can continue to output carbon dioxide.

[0025] Preferably, it also includes a safety valve 6; the safety valve 6 is connected to the inside of the gas storage tank 5 through the second connecting pipe 10; when the system is not working, when the pressure inside the gas storage tank 5 exceeds the safe pressure value, the safety valve 6 is opened by carbon dioxide and releases a certain amount of carbon dioxide until the pressure inside the gas storage tank 5 reaches the safe pressure value, and then the safety valve 6 closes.

[0026] In this embodiment, the pressure relief valve 4 is an electronically controlled valve, while the safety valve 6 is a spring-loaded control valve. Therefore, the above design allows for convenient control of the pressure inside the gas storage tank 5, thereby improving the safety of the gas storage tank 5.

[0027] In this embodiment, the safety pressure value of safety valve 6 is 13 MPa, and the preset pressure value of pressure relief valve 4 is 7.3 MPa-13 MPa. However, those skilled in the art should know that the above-mentioned preset pressure value can be set to other pressure values ​​according to actual needs, and no further examples will be given here.

[0028] The mass flow rate regulation system when carbon dioxide is used as the refrigerant also includes a manual valve 7. The manual valve 7 is connected to the inside of the gas storage tank 5 via a third connecting pipe 11. When the carbon dioxide in the gas storage tank 5 is insufficient, carbon dioxide can be added to the gas storage tank 5 through the manual valve 7. Specifically, the operator manually opens the manual valve 7 and then injects carbon dioxide. The carbon dioxide is injected into the gas storage tank 5 after passing through the manual valve 7. Once the mass of carbon dioxide in the gas storage tank 5 reaches the set value, the manual valve 7 can be closed.

[0029] A fourth connecting pipe 12 and a fifth connecting pipe 13, which connect to the inside of the gas storage tank 5, are respectively installed at the inlet and outlet of the gas storage tank 5; an electric control valve 8 is installed on the fourth connecting pipe 12 and the fifth connecting pipe 13 respectively. The above configuration facilitates the supply and recovery of carbon dioxide in the gas storage tank 5.

[0030] In summary, by installing components such as a heater 1, a pressure sensor 2, a temperature sensor 3, and a pressure relief valve 4 on the gas storage tank 5, this utility model can automatically adjust the pressure inside the gas storage tank 5 to ensure the pressure stability of the carbon dioxide refrigerant inside, thereby ensuring the stability of the carbon dioxide refrigerant supply and recovery of the heat pump, and ultimately achieving a stable pressure in the carbon dioxide refrigerant circulation system.

[0031] This utility model is not limited to the above-described embodiments. If any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also intends to include such modifications and variations.

Claims

1. A mass flow rate regulation system using carbon dioxide as a refrigerant, for use in a heat pump, characterized in that: It includes a heater, a pressure sensor, a temperature sensor, a pressure relief valve, and a gas storage tank with an inlet and an outlet that can withstand high pressure; the gas storage tank is used to store carbon dioxide. The heating end of the heater is located inside the gas storage tank; a first connecting pipe is provided on one side of the gas storage tank and connected to its interior, and the pressure sensor, the temperature sensor and the pressure relief valve are connected outward from the first connecting pipe in sequence. The temperature sensor can be used to detect the temperature of carbon dioxide inside the gas storage tank, so as to prevent the heater from overheating the carbon dioxide during operation and causing the pressure inside the gas storage tank to exceed the preset pressure value.

2. The mass flow rate regulating system using carbon dioxide as a refrigerant according to claim 1, characterized in that: It also includes a safety valve; the safety valve is connected to the inside of the gas storage tank via a second connecting pipe.

3. The mass flow rate regulation system for using carbon dioxide as a refrigerant according to claim 2, characterized in that: The pressure relief valve is an electronically controlled valve; the safety valve is a spring-loaded control valve.

4. The mass flow rate regulating system using carbon dioxide as a refrigerant according to claim 2, characterized in that: The safety valve has a safety pressure value of 13 MPa, and the pressure relief valve has a preset pressure value of 7.3 MPa-13 MPa.

5. The mass flow rate regulating system for using carbon dioxide as a refrigerant according to claim 1, characterized in that: It also includes a manual valve; the manual valve is connected to the inside of the gas storage tank via a third connecting pipe; when the carbon dioxide in the gas storage tank is insufficient, carbon dioxide can be added to the gas storage tank through the manual valve.

6. The mass flow rate regulating system for using carbon dioxide as a refrigerant according to claim 1, characterized in that: A fourth connecting pipe and a fifth connecting pipe, which are connected to the inside of the gas storage tank, are respectively provided at the inlet and outlet of the gas storage tank; an electric control valve is provided on the fourth connecting pipe and the fifth connecting pipe respectively.

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