Energy storage air conditioner with automatic liquid injection function and control method thereof

Abstract

The invention relates to the technical field of energy storage air conditioners, in particular to an energy storage air conditioner with an automatic liquid injection function and a control method of the energy storage air conditioner. The energy storage air conditioner comprises an evaporator, an automatic liquid injection path and a control system, the evaporator carries a secondary refrigerant, the automatic liquid injection path is connected with the evaporator, the automatic liquid injection path comprises a liquid inlet pipeline, one end of the liquid inlet pipeline is connected with the evaporator, the other end of the liquid inlet pipeline is provided with a liquid inlet, and the liquid inlet pipeline is provided with a circulating pump and an exhaust part; one end of the liquid outlet pipeline is connected with the evaporator, and the other end is provided with a liquid outlet; one end of the liquid supplementing pipeline is connected with the circulating pump, the other end of the liquid supplementing pipeline is provided with a liquid supplementing opening, and the liquid supplementing pipeline is provided with a liquid inlet valve; the control system is in communication connection with the automatic liquid injection path and used for controlling starting and stopping of the automatic liquid injection path according to the first water inlet pressure of the liquid inlet and the first water outlet pressure of the liquid outlet. The invention also provides an automatic liquid injection control method, so that the automation of the liquid injection process is realized, the liquid injection efficiency and accuracy are improved, and the stability and reliability of the system are enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage air conditioners, and in particular to an energy storage air conditioner with an automatic liquid injection function and a control method thereof. Background Art

[0002] With the continuous growth of energy demand and increasing attention to environmental issues, the application of energy storage technology in the field of air conditioning has received more and more attention. At present, the energy storage air conditioners on the market require multiple manual opening of the ball valve and the water supply pump for liquid injection. After liquid injection, the ball valve and the water supply pump need to be manually closed multiple times, and the water pump of the coolant circulation system needs to be opened multiple times to detect whether the target water pressure has been reached. The manual operation must be repeated to make the circulation system reach the target water pressure for liquid injection. In addition, the manual operation steps are complicated, prone to errors, and work efficiency is low. Summary of the invention The problem solved by the invention is that the manual operation of liquid filling of the energy storage air conditioner is cumbersome and the liquid filling efficiency is low.

[0003] To solve the above problems, the present invention adopts the following technical solutions: an energy storage air conditioner with automatic liquid injection function, the energy storage air conditioner comprising: an evaporator, an automatic liquid injection circuit and a control system, the evaporator carries a refrigerant, the automatic liquid injection circuit is connected to the evaporator, the automatic liquid injection circuit comprises: a liquid inlet pipeline, one end of which is connected to the evaporator, and the other end is provided with a liquid inlet, the liquid inlet pipeline is provided with a circulating pump and an exhaust member; a liquid outlet pipeline, one end of which is connected to the evaporator, and the other end is provided with a liquid outlet; a liquid replenishment pipeline, one end of which is connected to the circulating pump, and the other end is provided with a liquid replenishment port, and the liquid replenishment pipeline is provided with a liquid inlet valve; the control system is communicatively connected to the automatic liquid injection circuit, and the control system is used to control the start and stop of the automatic liquid injection circuit according to a first water inlet pressure of the liquid inlet and a first water outlet pressure of the liquid outlet.

[0004] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by setting up an automatic liquid injection circuit and a control system that is connected to the automatic liquid injection circuit, the automation of the liquid injection process of the energy storage air conditioner is realized. Without manual intervention, the start and stop of the liquid injection circuit can be automatically controlled according to the water inlet pressure of the liquid inlet and the water outlet pressure of the liquid outlet, which greatly improves the liquid injection efficiency and saves labor costs and time costs. At the same time, a circulating pump and an exhaust member are provided in the liquid inlet pipeline, which reduces the additional liquid injection pump. The exhaust member is used to cut off the flow channel in the liquid inlet pipeline based on the principle of pumping water by the circulating pump, creating a point below the atmospheric pressure, and connecting with the external waterway here. The external atmospheric pressure presses the water into the pipeline with low air pressure to create negative pressure, realize system filling, save costs, and prevent the gas from having adverse effects on the liquid injection process and system operation, ensuring the stable operation of the system. Moreover, a single circulating pump can realize all the functions of the two pumps, the circulating pump and the liquid injection pump, reducing costs.

[0005] Furthermore, the liquid infusion pipeline also includes a liquid inlet one-way valve, which is connected in parallel with the liquid inlet valve, one end of the liquid inlet one-way valve is connected to the circulation pump, and the other end is connected to the liquid infusion port.

[0006] Compared with the existing technology, the technical effect achieved by adopting this technical scheme is as follows: a liquid inlet one-way valve is added to the liquid replenishing pipeline in parallel with the liquid inlet valve. Liquid injection can be achieved without opening the liquid inlet valve, which can prevent the refrigerant from flowing back under certain circumstances. It works together with the liquid inlet valve to further ensure the stability of the liquid replenishing process, while avoiding frequent opening and closing of the liquid replenishing port, enhancing the reliability of liquid injection, and greatly improving the liquid injection efficiency.

[0007] Furthermore, the exhaust member adopts a first ball valve, and the pressure difference of the liquid inlet pipeline is controlled by opening and closing the first ball valve.

[0008] Compared with the prior art, the technical effect achieved by adopting this technical solution is that the pressure difference of the liquid inlet pipeline can be adjusted by accurately controlling the opening and closing of the first ball valve. This makes it possible to adjust the pressure state in the pipeline according to actual needs during the liquid injection process, ensuring that the refrigerant can enter the evaporator at a suitable flow rate and pressure, thereby improving the efficiency and accuracy of liquid injection.

[0009] Furthermore, the liquid inlet and the liquid outlet are provided with pressure sensors. Compared with the prior art, the technical effect achieved by adopting this technical solution is that the pressure sensors are arranged at the liquid inlet and the liquid outlet to monitor the pressure of the liquid inlet and the liquid outlet in real time. The control system makes real-time and accurate adjustments to the liquid injection through the pressure of the liquid inlet and the liquid outlet.

[0010] Furthermore, the rehydration pipeline also includes a rehydrator, which is connected to the liquid inlet valve. The control system is also used to control the start and stop of the automatic liquid injection circuit based on the liquid level information in the rehydrator and the first water inlet pressure of the liquid inlet and the first water outlet pressure of the liquid outlet.

[0011] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: adding a liquid replenisher and using the control system to control the start and stop of the automatic liquid injection circuit according to the liquid level information in the liquid replenisher and the pressure of the liquid inlet and outlet, making the liquid injection control more accurate. The combination of liquid level information and pressure information can fully reflect the state of the refrigerant in the energy storage air conditioning system, thereby ensuring the stability of liquid injection and avoiding insufficient or excessive liquid injection.

[0012] The second object of the present invention is to provide an automatic liquid injection control method, which is applied to the above-mentioned energy storage air conditioner. The automatic liquid injection control method includes: obtaining the water inlet pressure and the water outlet pressure, and obtaining the operating frequency of the circulation pump; comparing the water inlet pressure with the preset maximum water pressure value, and the water inlet pressure with the preset minimum water pressure value; comparing the water outlet pressure with the preset maximum water pressure value, and comparing the water outlet pressure with the preset minimum water pressure value; when the preset minimum water pressure value ≥ water inlet pressure ≥ preset minimum water pressure value, and the preset minimum water pressure value ≥ water outlet pressure ≥ preset minimum water pressure value, executing step A; Step A: determine whether the operating frequency of the circulation pump is the preset maximum operating frequency. If so, the energy storage air conditioner is filled with liquid.

[0013] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: This control method realizes intelligent control of the liquid injection process of the energy storage air conditioner by obtaining the water inlet pressure, water outlet pressure and the operating frequency of the circulating pump. It can automatically judge the liquid injection status according to the real-time pressure and frequency parameters without manual intervention, thereby improving the accuracy and efficiency of liquid injection. The water inlet pressure and water outlet pressure are controlled within the above range to prevent overpressure from damaging the air conditioner evaporator and its pipelines.

[0014] Furthermore, after obtaining the water inlet pressure and the water outlet pressure and obtaining the operating frequency of the circulation pump, the automatic liquid injection control method further includes: closing the exhaust member and starting the circulation pump to execute step B; Step B: The circulating pump load is b*Ki (i=1, 2, 3, 4, ..., i, i+1), where 0≤Ki≤100%, and b is the preset maximum operating frequency.

[0015] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: the pressure required by the energy storage air conditioner is the basis for the circulation of the circulating pump. If the load of the circulating pump is less than the pressure required by the energy storage air conditioner, fluid replenishment cannot be performed. At the same time, the pressure required by the energy storage air conditioner is less than or equal to the pipeline design pressure. During the fluid replenishment process, the load of the circulating pump is continuously increased, which can effectively reduce the entry of air and ensure that the refrigerant can be smoothly injected into the system.

[0016] Furthermore, step A also includes determining whether the operating frequency of the circulating pump is a preset maximum operating frequency. If not, then entering step E, Step E includes: increasing the load of the circulation pump, where K(i+1)=Ki+J, J>0, judging whether K(i+1) is less than 100%, if so, the load of the circulation pump is b*K(i+1), if not, the operating frequency of the circulation pump is 100%.

[0017] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: gradually increase the water pump frequency. If the water pressure at different water pump frequencies can meet the system design requirements, it means that the gas has been basically discharged. If the water pressure is not satisfied during the process of increasing the water pump frequency, it means that the existing air has been discharged and needs to be replenished again. Accurately controlling the load of the circulating pump can reduce the instability of the outlet pressure caused by air during the injection process, so as to improve the efficiency and accuracy of the injection.

[0018] Furthermore, step B also includes: detecting the water outlet pressure and the liquid injection pressure, and when the water outlet pressure ≥ the liquid injection pressure, the automatic liquid injection circuit enters the exhaust mode.

[0019] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: when the water outlet pressure ≥ the injection pressure, it means that there is air in the pipeline, and it is necessary to enter the exhaust mode to exhaust the air in the pipeline.

[0020] Further, the exhaust mode includes: step C, closing the circulation pump, opening the exhaust component, and executing step D; Step D, turn on the circulation pump, determine whether the running time of the circulation pump is greater than or equal to the preset time, and the preset minimum water pressure value ≥ water inlet pressure ≥ preset minimum water pressure value, and the preset minimum water pressure value ≥ water outlet pressure ≥ preset minimum water pressure value. If so, proceed to step A.

[0021] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: during the liquid injection process, the presence of air will seriously affect the accuracy and stability of the liquid injection. This exhaust mode can exhaust the air in a timely and effective manner to ensure that the refrigerant can fill the pipeline, thereby ensuring the accuracy of the liquid injection, so that the energy storage air conditioning system can operate normally and exert the best performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of an energy storage air conditioner according to an embodiment of the present invention; Figure 2 The present invention is a flowchart of an automatic liquid injection control method for an energy storage air conditioner according to an embodiment of the present invention.

[0023] Explanation of the reference numerals: 100 - energy storage air conditioner, 1 - evaporator; 2 - exhaust component; 3 - circulation pump; 4 - liquid inlet check valve; 5 - liquid inlet valve, 6 - liquid inlet, 7 - liquid outlet, 8 - liquid replenishing port. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] See also Figure 1-Figure 2, which is an energy storage air conditioner 100 with automatic liquid injection function provided by an embodiment of the present invention, the energy storage air conditioner 100 includes: an evaporator 1, an automatic liquid injection circuit and a control system, the evaporator 1 carries a refrigerant, the automatic liquid injection circuit is connected to the evaporator 1, the automatic liquid injection circuit includes: an inlet pipeline, a liquid outlet pipeline and a liquid replenishment pipeline, one end of the liquid inlet pipeline is connected to the evaporator 1, and the other end is provided with a liquid inlet 6, and a circulating pump 3 and an exhaust member 2 are provided at the liquid inlet pipeline; one end of the liquid outlet pipeline is connected to the evaporator 1, and the other end is provided with a liquid outlet 7; one end of the liquid replenishment pipeline is connected to the circulating pump 3, and the other end is provided with a liquid replenishment port 8, and a liquid inlet valve 5 is provided at the liquid replenishment pipeline; the control system is communicatively connected to the automatic liquid injection circuit, and the control system is used to control the start and stop of the automatic liquid injection circuit according to the first water inlet pressure of the liquid inlet 6 and the first water outlet pressure of the liquid outlet 7.

[0026] By setting up an automatic liquid injection circuit and a control system that is connected to the automatic liquid injection circuit, the automation of the liquid injection process of the energy storage air conditioner 100 is realized. Without manual intervention, the start and stop of the liquid injection circuit can be automatically controlled according to the water inlet pressure of the liquid inlet 6 and the water outlet pressure of the liquid outlet 7, which greatly improves the liquid injection efficiency and saves labor costs and time costs. At the same time, a circulating pump 3 and an exhaust member 2 are provided in the liquid inlet pipeline, which reduces the additional liquid injection pump. The exhaust member 2 is used to cut off the flow channel in the liquid inlet pipeline based on the principle of pumping water by the circulating pump 3, creating a point below the atmospheric pressure, and connecting with the external waterway here. The external atmospheric pressure presses the water into the pipeline with low air pressure to create negative pressure, realize system filling, save costs, and prevent the gas from having adverse effects on the liquid injection process and system operation, ensuring the stable operation of the system. Moreover, a single circulating pump 3 can realize all the functions of the two pumps, the circulating pump 3 and the liquid injection pump, reducing costs.

[0027] Specifically, see Figure 1 The liquid infusion pipeline also includes a liquid inlet check valve 4, which is connected in parallel with the liquid inlet valve 5. One end of the liquid inlet check valve 4 is connected to the circulation pump 3, and the other end is connected to the liquid infusion port 8.

[0028] At the same time, for example, the number of liquid inlet check valves can be set to multiple according to system requirements.

[0029] An inlet one-way valve 4 is added to the liquid replenishing pipeline in parallel with the inlet valve 5. The inlet valve 5 does not need to be opened during liquid injection to achieve liquid injection, which can prevent the coolant from flowing back under certain circumstances. It works together with the inlet valve 5 to further ensure the stability of the liquid replenishing process and avoid frequent opening and closing of the liquid replenishing port 8. It not only enhances the reliability of liquid injection, but also greatly improves the liquid injection efficiency.

[0030] Furthermore, the exhaust member 2 adopts a first ball valve, and the pressure difference of the liquid inlet pipeline is controlled by opening and closing the first ball valve.

[0031] For example, the first ball valve adopts an electric ball valve, which can save costs and adjust the pressure difference of the liquid inlet pipeline by accurately controlling the opening and closing of the first ball valve. This makes it possible to adjust the pressure state in the pipeline according to actual needs during the liquid injection process, ensuring that the refrigerant can enter the evaporator 1 at a suitable flow rate and pressure, thereby improving the efficiency and accuracy of liquid injection.

[0032] Furthermore, the liquid inlet 6 and the liquid outlet 7 are provided with pressure sensors. Pressure sensors are provided at the liquid inlet 6 and the liquid outlet 7 to monitor the pressure of the liquid inlet and the liquid outlet in real time. The control system makes real-time and accurate adjustments to the liquid injection through the pressure of the liquid inlet 6 and the liquid outlet 7.

[0033] Furthermore, the rehydration pipeline also includes a rehydrator, which is connected to the liquid inlet valve 5. The control system is also used to control the start and stop of the automatic injection circuit based on the liquid level information in the rehydrator and the first water inlet pressure of the liquid inlet 6 and the first water outlet pressure of the liquid outlet 7.

[0034] A liquid replenisher is added and the control system controls the start and stop of the automatic liquid injection circuit according to the liquid level information in the liquid replenisher and the pressure of the liquid inlet 6 and the liquid outlet 7, so that the liquid injection control is more accurate. The combination of liquid level information and pressure information can fully reflect the state of the refrigerant in the energy storage air conditioner 100 system, thereby ensuring the stability of liquid injection and avoiding insufficient or excessive liquid injection.

[0035] The second object of the present invention is to provide an automatic liquid injection control method, which is applied to the above energy storage air conditioner 100, see Figure 2 The automatic liquid injection control method includes: obtaining the water inlet pressure and the water outlet pressure, obtaining the operating frequency of the circulation pump 3; comparing the water inlet pressure with the preset maximum water pressure value, and the water inlet pressure with the preset minimum water pressure value; comparing the water outlet pressure with the preset maximum water pressure value, and comparing the water outlet pressure with the preset minimum water pressure value; when the preset minimum water pressure value ≥ water inlet pressure ≥ preset minimum water pressure value, and the preset minimum water pressure value ≥ water outlet pressure ≥ preset minimum water pressure value, executing step A; Step A: determine whether the operating frequency of the circulation pump 3 is the preset maximum operating frequency. If so, the liquid injection of the energy storage air conditioner 100 is completed.

[0036] The control method realizes intelligent control of the liquid injection process of the energy storage air conditioner 100 by obtaining the water inlet pressure, the water outlet pressure and the operating frequency of the circulating pump 3. The liquid injection state can be automatically determined according to the real-time pressure and frequency parameters without manual intervention, thereby improving the accuracy and efficiency of the liquid injection. The water inlet pressure and the water outlet pressure are controlled within the above range to prevent overpressure from damaging the air conditioner evaporator 1 and its pipeline.

[0037] To reiterate, the control method is initiated according to the demand of the energy storage air conditioner 1 and executes corresponding actions. In the initial state, the liquid inlet valve 5 is in a normally closed state, and a liquid replenishing tank is installed to perform liquid replenishing operation.

[0038] When the circulating pump 3 is running, it takes a certain amount of time to wait for the maximum amount of gas to be discharged. At this time, due to the operation of the water pump, the impact of water flow, the fluctuation of water pressure or the presence of gas in the pipeline, if the water inlet pressure and water outlet pressure meet the above condition range, it means that the gas under the water pump frequency has been basically discharged or meets the system design operation requirements. If the above range is not met, it means that the water volume does not meet the design requirements of the energy storage air conditioner.

[0039] Furthermore, after obtaining the water inlet pressure and the water outlet pressure and obtaining the operating frequency of the circulation pump 3, the automatic liquid injection control method further includes: closing the exhaust member 2, and starting the circulation pump 3, and executing step B; Step B: The load of the circulating pump 3 is b*Ki (i=1, 2, 3, 4, ..., i, i+1), wherein 0≤Ki≤100%, and b is the preset maximum operating frequency.

[0040] The pressure required by the energy storage air conditioner 100 is the basis for the circulation of the circulating pump 3. If the load of the circulating pump 3 is less than the pressure required by the energy storage air conditioner 100, the liquid cannot be replenished. At the same time, the pressure required by the energy storage air conditioner 100 is less than or equal to the pipeline design pressure. During the liquid replenishment process, the load of the circulating pump 3 is continuously increased, which can effectively reduce the entry of air and ensure that the coolant can be smoothly injected into the system. Once again, the initial operation of the circulating pump 3 at a low load, so that multiple injections and cycles are more beneficial to gas discharge and improve the stability of liquid replenishment.

[0041] Specifically, step A also includes determining whether the operating frequency of the circulation pump 3 is a preset maximum operating frequency, if not, proceeding to step E; Step E includes: increasing the load of the circulation pump 3, where K(i+1)=Ki+J, J>0, judging whether K(i+1) is less than 100%, if so, the load of the circulation pump 3 is b*K(i+1), if not, the operating frequency of the circulation pump 3 is 100%.

[0042] Gradually increase the frequency of the circulating pump 3. If the water pressure at different frequencies of the circulating pump 3 can meet the system design requirements, it means that the gas has been basically discharged. If the water pressure is not satisfied during the process of increasing the frequency of the circulating pump 3, it means that the existing air has been discharged and it is necessary to replenish the fluid again. Accurately controlling the load of the circulating pump 3 can reduce the pressure instability of the liquid outlet 7 caused by air during the injection process, so as to improve the efficiency and accuracy of the injection.

[0043] Specifically, step B also includes: detecting the water outlet pressure and the liquid injection pressure, and when the water outlet pressure is ≥ the liquid injection pressure, the automatic liquid injection circuit enters the exhaust mode.

[0044] When the water outlet pressure ≥ the injection pressure, it means that there is air in the pipeline and it is necessary to enter the exhaust mode to exhaust the air in the pipeline.

[0045] For further information, see Figure 2 , the exhaust mode includes: step C, closing the circulation pump 3, opening the exhaust part 2, and executing step D; Step D, turn on the circulation pump 3, determine whether the running time of the circulation pump 3 is greater than or equal to the preset time, and the preset minimum water pressure value ≥ water inlet pressure ≥ preset minimum water pressure value, and the preset minimum water pressure value ≥ water outlet pressure ≥ preset minimum water pressure value. If so, enter step A.

[0046] During the injection process, the presence of air will seriously affect the accuracy and stability of the injection. This exhaust mode can exhaust the air in a timely and effective manner to ensure that the refrigerant can fill the pipeline, thereby ensuring the accuracy of the injection and allowing the energy storage air conditioner 100 system to operate normally and perform at its best.

[0047] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. An energy storage air conditioner (100) with automatic liquid injection function, characterized in that: The energy storage air conditioner (100) comprises: An evaporator (1), an automatic liquid injection circuit and a control system, wherein the evaporator (1) carries a refrigerant, the automatic liquid injection circuit is connected to the evaporator (1), and the automatic liquid injection circuit comprises: A liquid inlet pipeline, one end of which is connected to the evaporator (1) and the other end of which is provided with a liquid inlet (6), wherein the liquid inlet pipeline is provided with a circulation pump (3) and an exhaust member (2); A liquid outlet pipeline, one end of which is connected to the evaporator (1) and the other end of which is provided with a liquid outlet (7); A liquid replenishment pipeline, one end of which is connected to the circulation pump (3), and the other end of which is provided with a liquid replenishment port (8), and the liquid replenishment pipeline is provided with a liquid inlet valve (5); The control system is in communication connection with the automatic liquid injection circuit, and the control system is used to control the start and stop of the automatic liquid injection circuit according to a first water inlet pressure of the liquid inlet (6) and a first water outlet pressure of the liquid outlet (7).

2. The energy storage air conditioner (100) according to claim 1, characterized in that: The liquid infusion pipeline further comprises a liquid inlet check valve (4), wherein the liquid inlet check valve (4) is connected in parallel with the liquid inlet valve (5), and one end of the liquid inlet check valve (4) is connected to the circulation pump (3), and the other end is connected to the liquid infusion port (8).

3. The energy storage air conditioner (100) according to claim 2, characterized in that: The exhaust component (2) adopts a first ball valve, and the pressure difference of the liquid inlet pipeline is controlled by opening and closing the first ball valve.

4. The energy storage air conditioner (100) according to claim 1, characterized in that: The liquid inlet (6) and the liquid outlet (7) are provided with pressure sensors.

5. The energy storage air conditioner (100) according to claim 1, characterized in that: The liquid replenishing pipeline also includes a liquid replenisher, which is connected to the liquid inlet valve (5). The control system is also used to control the start and stop of the automatic liquid injection circuit based on the liquid level information in the liquid replenisher, the water inlet pressure of the liquid inlet (6), and the water outlet pressure of the liquid outlet (7).

6. An automatic liquid injection control method, characterized in that: Applied to the energy storage air conditioner (100) according to any one of claims 1 to 5, the automatic liquid injection control method comprises: obtaining water inlet pressure and water outlet pressure, and obtaining the operating frequency of the circulation pump (3); Compare the water inlet pressure with the preset maximum water pressure value, and the water inlet pressure with the preset minimum water pressure value; compare the water outlet pressure with the preset maximum water pressure value, and compare the water outlet pressure with the preset minimum water pressure value; when the preset minimum water pressure value ≥ the water inlet pressure ≥ the preset minimum water pressure value, and the preset minimum water pressure value ≥ the water outlet pressure ≥ the preset minimum water pressure value, execute step A; Step A: determining whether the operating frequency of the circulation pump (3) is a preset maximum operating frequency; if so, the liquid injection of the energy storage air conditioner (100) is completed.

7. The automatic liquid injection control method according to claim 6, characterized in that: After obtaining the water inlet pressure and the water outlet pressure and obtaining the operating frequency of the circulation pump (3), the automatic liquid injection control method further comprises: closing the exhaust member (2), starting the circulation pump (3), and executing step B; Step B: The load of the circulating pump (3) is b*Ki (i=1, 2, 3, 4, ..., i, i+1), wherein 0≤Ki≤100%, and b is the preset maximum operating frequency.

8. The automatic liquid injection control method according to claim 6, characterized in that: The step A also includes determining whether the operating frequency of the circulation pump (3) is a preset maximum operating frequency. If not, proceeding to step E. The step E includes: The load of the circulation pump (3) is increased, wherein K(i+1)=Ki+J, J>0, and it is determined whether K(i+1) is less than 100%. If so, the load of the circulation pump (3) is b*K(i+1); if not, the operating frequency of the circulation pump (3) is 100%.

9. The automatic liquid injection control method according to claim 7, characterized in that: The step B also includes: detecting the water outlet pressure and the liquid injection pressure, and when the water outlet pressure is greater than or equal to the liquid injection pressure, the automatic liquid injection circuit enters an exhaust mode.

10. The automatic liquid injection control method according to claim 9, characterized in that: The exhaust modes include: Step C, closing the circulation pump (3), opening the exhaust component (2), and executing step D; Step D, turning on the circulation pump (3), determining whether the current running time of the circulation pump (3) is greater than or equal to the preset time, and whether the preset minimum water pressure value ≥ the water inlet pressure ≥ the preset minimum water pressure value, and the preset minimum water pressure value ≥ the water outlet pressure ≥ the preset minimum water pressure value; if so, proceeding to step A.

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