Anti-freezing protection control method and heat pump air conditioner

Abstract

The invention discloses an anti-freezing protection control method and a heat pump air conditioner, and relates to the technical field of air conditioners, and the method comprises the steps that when the heat pump air conditioner is powered on and does not run and the environment temperature is lower than the preset environment temperature, the time duration required for predicted freezing of water in the heat pump air conditioner is determined; the heat pump air conditioner is controlled to execute preset anti-freezing protection operation according to the expected duration needed by freezing; when the heat pump air conditioner is not powered on, whether the heat pump air conditioner meets the active drainage condition or not is monitored through a temperature control electromagnetic valve, when the active drainage condition is met, the temperature control electromagnetic valve opens a valve to conduct drainage on the heat pump air conditioner, and the active drainage condition means that the duration when the water temperature is lower than the preset temperature exceeds the preset protection duration. The protection device can be effectively prevented from being damaged by freezing of water in the heat pump air conditioner, and the reliability of the heat pump air conditioner is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an antifreeze protection control method and a heat pump air conditioner. Background Art

[0002] Using heat pump air conditioners for heating is not only environmentally friendly but also allows for precise temperature control, so heat pump air conditioners are becoming more and more widely used. However, most heat pump air conditioners use fluorinated water for heat exchange, and the water system is a closed system with multiple protective devices, such as heat exchangers, water flow switches, temperature sensors, etc. If the user is away from home for a long time in a low temperature environment and forgets to drain the water in the water system, the water in the heat pump air conditioner will freeze, causing the water flow switch and other protective devices to freeze, making the heat pump air conditioner less reliable. Summary of the Invention

[0003] The embodiments of the present application provide a solution that can effectively prevent protective components in a heat pump air conditioner from being frozen and improve the reliability of the heat pump air conditioner.

[0004] The embodiments of this application provide the following technical solutions:

[0005] According to one embodiment of the present application, an antifreeze protection control method is applicable to a heat pump air conditioner, which includes a temperature control solenoid valve; the method includes: when the heat pump air conditioner is powered on but not running and the ambient temperature is lower than a predetermined ambient temperature, determining the expected time required for water in the heat pump air conditioner to freeze, and controlling the heat pump air conditioner to perform a preset antifreeze protection operation based on the expected time required for freezing; when the heat pump air conditioner is not powered on, monitoring whether the heat pump air conditioner meets an active drainage condition through the temperature control solenoid valve, and opening the valve by the temperature control solenoid valve to drain the heat pump air conditioner when the active drainage condition is met, the active drainage condition refers to the time when the water temperature is lower than the predetermined temperature exceeding the predetermined protection time.

[0006] In some embodiments of the present application, the method for calculating the expected freezing time includes: calculating based on the total water volume in the heat pump air conditioner, the total surface area of the pipes and water tank in the heat pump air conditioner, and the absolute value of the ambient temperature to obtain the expected freezing time; or calculating based on the total water volume in the heat pump air conditioner, the water flow rate, the expected total surface area of the pipes and water tank in the heat pump air conditioner, and the absolute value of the external ambient temperature to obtain the expected freezing time.

[0007] In some embodiments of the present application, controlling the heat pump air conditioner to perform a preset antifreeze protection operation based on the expected time required for freezing includes: determining a first antifreeze protection time based on the expected time required for freezing; and controlling the heat pump air conditioner to operate for heating according to a predetermined mode when no user instruction is received after the first antifreeze protection time has passed.

[0008] In some embodiments of the present application, the method further includes: determining a second antifreeze protection time, which is greater than the first antifreeze protection time; when the user instruction is not received after the second antifreeze protection time, controlling the heat pump air conditioner to stop heating, and controlling the valve to open for drainage through the energized coil in the temperature control solenoid valve.

[0009] In some embodiments of the present application, determining the first antifreeze protection time based on the expected freezing time includes: determining the triggering moment when the ambient temperature is lower than the predetermined ambient temperature; adding the triggering moment, the expected freezing time and the predetermined delay time to obtain the first antifreeze protection time.

[0010] In some embodiments of the present application, the method further includes: sending an icing warning message to the user when the heat pump air conditioner is powered on but not running and the ambient temperature is lower than a predetermined ambient temperature.

[0011] According to another embodiment of the present application, a heat pump air conditioner includes: a fluorine side system and a water side system; a heat exchanger, through which the fluorine side system and the water side system are connected; a temperature control solenoid valve is provided at the bottom of the heat exchanger; and a controller, which is electrically connected to the temperature control solenoid valve and the fluorine side system.

[0012] In some embodiments of the present application, the heat pump air conditioner further includes a water tank, and the temperature control solenoid valve is also provided at the bottom of the water tank.

[0013] In some embodiments of the present application, the temperature-controlled solenoid valve includes an energized coil, a temperature-controlled timing mechanical part, and a valve.

[0014] In some embodiments of the present application, the heat exchanger includes a water inlet and a water outlet, and the water inlet is provided with a water flow switch.

[0015] In an embodiment of the present application, when the heat pump air conditioner is powered on but not running and the ambient temperature is lower than a predetermined ambient temperature, the estimated time required for the water in the heat pump air conditioner to freeze is determined, and the heat pump air conditioner is controlled to perform a preset antifreeze protection operation based on the estimated time required for freezing; when the heat pump air conditioner is not powered on, the heat pump air conditioner is monitored by a temperature-controlled solenoid valve to determine whether it meets the active drainage condition, and when the active drainage condition is met, the temperature-controlled solenoid valve opens the valve to drain the heat pump air conditioner, and the active drainage condition refers to the time when the water temperature is lower than the predetermined temperature exceeding the predetermined protection time.

[0016] In this manner in the embodiments of the present application, the heat pump air conditioner can be effectively protected from freezing when it is powered on but not running, or when it is not powered on, to prevent water in the heat pump air conditioner from freezing and damaging protective components, thereby improving the reliability of the heat pump air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A flow chart of an antifreeze protection control method according to an embodiment of the present application is shown.

[0019] Figure 2 The following schematically shows a system structure diagram of a heat pump air conditioner according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] The present disclosure will be further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the examples provided herein are merely for explaining the present disclosure and are not intended to limit the present disclosure. In addition, the examples provided below are partial examples for implementing the present disclosure, rather than providing all examples for implementing the present disclosure. In the absence of conflict, the technical solutions described in the examples of the present disclosure may be implemented in any combination.

[0021] It should be noted that, in the embodiments of the present disclosure, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a method or apparatus comprising a series of elements includes not only the elements explicitly stated, but also other elements not explicitly listed, or also includes elements inherent to the implementation of the method or apparatus. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other related elements (such as steps in the method or units in the apparatus, for example, a unit may be part of a circuit, part of a processor, part of a program or software, etc.) in the method or apparatus comprising the element.

[0022] For example, the antifreeze protection control method provided in the embodiment of the present disclosure includes a series of steps, but the antifreeze protection control method provided in the embodiment of the present disclosure is not limited to the recorded steps. Similarly, the antifreeze protection control device provided in the embodiment of the present disclosure includes a series of units, but the device provided in the embodiment of the present disclosure is not limited to including the units explicitly recorded, and may also include units that need to be set up to obtain relevant information or perform processing based on information.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure pertains. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure.

[0024] It is understandable that in the specific implementation of this application, relevant data is involved. When the embodiments in this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards.

[0025] Figure 1 The flowchart of the antifreeze protection control method according to one embodiment of the present application is schematically shown. Figure 1 The antifreeze protection control method shown can be applied to a heat pump air conditioner in which a temperature control solenoid valve is provided. For example, in one method, a temperature control solenoid valve can be provided at the bottom of the heat exchanger. In another method, a temperature control solenoid valve can also be provided at the bottom of the water tank.

[0026] like Figure 1 As shown, the antifreeze protection control method may include step S110 and step S120.

[0027] Step S110, when the heat pump air conditioner is powered on but not running and the ambient temperature is lower than a predetermined ambient temperature, determining an estimated freezing time of water in the heat pump air conditioner, and controlling the heat pump air conditioner to perform a preset antifreeze protection operation according to the estimated freezing time;

[0028] In step S120, when the heat pump air conditioner is not powered on, the temperature control solenoid valve is used to monitor whether the heat pump air conditioner meets the active drainage conditions, and when the active drainage conditions are met, the temperature control solenoid valve opens the valve to drain the heat pump air conditioner. The active drainage condition refers to the time when the water temperature is lower than the predetermined temperature exceeding the predetermined protection time.

[0029] When the heat pump air conditioner is powered on but not running, the controller in the heat pump air conditioner (such as a wired controller or a centralized controller, etc.) can perform the following operations: monitor whether the ambient temperature is lower than a predetermined ambient temperature (such as 0°C); if the ambient temperature is lower than the predetermined ambient temperature, first determine the expected freezing time of the water in the heat pump air conditioner; then, based on the expected freezing time, control the heat pump air conditioner to perform a preset antifreeze protection operation, thereby preventing the water in the heat pump air conditioner from freezing and damaging the protection device.

[0030] When the heat pump air conditioner is not powered on, the temperature control timing mechanical part of the temperature control solenoid valve in the heat pump air conditioner can perform the following operations: monitoring whether the heat pump air conditioner meets the active drainage conditions, and when the active drainage conditions are met, the temperature control timing mechanical part of the temperature control solenoid valve actively opens the valve to drain the heat pump air conditioner. Draining the water in the heat pump air conditioner can prevent the water in the heat pump air conditioner from freezing and damaging the protective device. The active drainage condition refers to the time period when the water temperature in the heat pump air conditioner is lower than the predetermined temperature and exceeds the predetermined protection time period. The predetermined protection time period can be set according to actual conditions. For example, in one example, the predetermined protection time period can be equal to the expected freezing time period. In other examples, the predetermined protection time period can be a period of time greater than the expected freezing time period.

[0031] In short, in this manner according to the embodiments of the present application, the heat pump air conditioner can be effectively protected from freezing when it is powered on but not running, or when it is not powered on, to prevent water in the heat pump air conditioner from freezing and damaging protective components, thereby improving the reliability of the heat pump air conditioner.

[0032] Described below Figure 1 When antifreeze protection control is performed under the embodiment, further optional specific embodiments are provided for each step performed.

[0033] The estimated freezing time in the aforementioned embodiment may be determined by calculation by the controller when the heat pump air conditioner is installed, or the estimated freezing time in the aforementioned embodiment may be determined by dynamic calculation by the controller.

[0034] Specifically, the calculation method of the expected freezing time may include:

[0035] The first method is to calculate the estimated time required for freezing based on the total water volume in the heat pump air conditioner, the total surface area of the pipes and water tank in the heat pump air conditioner, and the absolute value of the ambient temperature;

[0036] Alternatively, the second method is to calculate the estimated time required for freezing based on the total water volume and water flow in the heat pump air conditioner, the estimated total surface area of the pipes and water tank in the heat pump air conditioner, and the absolute value of the external ambient temperature.

[0037] The first method uses the total water volume (V) in the heat pump air conditioner, the total surface area of the heat pump air conditioner's pipes and water tank (A), and the absolute value of the ambient temperature (T) to calculate the expected freezing time (tfreeze). This method can accurately calculate the expected freezing time, thereby ensuring the effectiveness of antifreeze protection control.

[0038] Specifically, in one example, the estimated time required for freezing (tfreeze) can be calculated according to the formula tfreeze≈(1000*V) / (A*T). According to this formula, the estimated time required for freezing can be accurately calculated based on the total water volume (V) in the heat pump air conditioner, the total surface area of the pipes and water tanks in the heat pump air conditioner (A), and the absolute value of the ambient temperature (T).

[0039] The second method calculates the estimated freezing time (tfreeze) based on the total water volume (V) in the heat pump air conditioner, the water flow rate (S), the estimated total surface area of the heat pump air conditioner's pipes and water tank (A), and the absolute value of the external ambient temperature (T). This method can further accurately calculate the estimated freezing time, thereby further ensuring the effectiveness of antifreeze protection control. In particular, in heat pump systems, the accuracy of the estimated freezing time can be further improved when the water pump is turned on to circulate water.

[0040] Among them, the total water volume can specifically refer to the total water volume in the closed system (all water systems) in the heat pump air conditioner, and the total surface area can specifically refer to the sum of the surface areas of all pipes in the heat pump air conditioner and the surface area of the water tank.

[0041] In one embodiment, controlling the heat pump air conditioner to perform a preset antifreeze protection operation based on the expected duration of freezing may include: determining a first antifreeze protection time based on the expected duration of freezing; and controlling the heat pump air conditioner to operate for heating according to a predetermined mode when no user instruction is received after the first antifreeze protection time has passed.

[0042] In this embodiment, when the heat pump air conditioner is powered on but not running and the ambient temperature is lower than the predetermined ambient temperature, after determining the expected time required for the water in the heat pump air conditioner to freeze, the first antifreeze protection time is further determined. Then, when no user instruction is received after the first antifreeze protection time has passed, the heat pump air conditioner is controlled to operate for heating according to a predetermined mode. By operating for heating, it can be ensured that the water does not freeze, thereby preventing the protective device from being damaged by freezing.

[0043] In the preset mode, the heat pump air conditioner can automatically operate at the lowest frequency for heating, thereby ensuring that water does not freeze while saving energy. User commands can be commands sent to the heat pump air conditioner by the user through a preset application (APP). User commands may include but are not limited to commands to turn on the heat pump air conditioner or to disable antifreeze protection.

[0044] In some implementations, determining the first antifreeze protection time based on the estimated time required for freezing may specifically include: determining the estimated time required for freezing as the first antifreeze protection time.

[0045] Furthermore, in one embodiment, the first antifreeze protection time is determined based on the expected time required for freezing, which may specifically include: determining the trigger moment when the ambient temperature is lower than the predetermined ambient temperature; adding the trigger moment, the expected time required for freezing, and the predetermined delay time to obtain the first antifreeze protection time.

[0046] First, the trigger time is determined as the time when the ambient temperature falls below the predetermined ambient temperature. Then, the trigger time, the estimated freezing time, and the predetermined delay time are added together to form the first antifreeze protection time. In other words, the first antifreeze protection time (hours) = trigger time + estimated freezing time + predetermined delay time (e.g., 8 hours).

[0047] In this embodiment, the first antifreeze protection time is superimposed with a predetermined delay time on the basis of the estimated time required for freezing. When no user instruction is received after the first antifreeze protection time, the heat pump air conditioner is controlled to operate for heating according to a predetermined mode. This can ensure timely antifreeze protection while allowing the user to have enough time to perform related operations and transmit user instructions, further improving the user experience of the protection processing.

[0048] In one embodiment, the method may further include: determining a second antifreeze protection time, the second antifreeze protection time being greater than the first antifreeze protection time; when no user instruction is received after the second antifreeze protection time, controlling the heat pump air conditioner to stop heating, and controlling the valve to open for drainage through the energized coil in the temperature control solenoid valve.

[0049] In this embodiment, a second antifreeze protection time is further determined. The second antifreeze protection time is greater than the first antifreeze protection time. For example, the second antifreeze protection time = trigger time + 24 hours. If no user command is received after the second antifreeze protection time, the heat pump air conditioner is controlled to stop heating, and the energized coil in the temperature control solenoid valve controls the valve to open for drainage, thereby draining all water from the heat pump air conditioner and preventing water from freezing.

[0050] In one embodiment, when the heat pump air conditioner is powered on but not running and the ambient temperature is lower than a predetermined ambient temperature, the method may further include: sending an icing warning message to the user.

[0051] For example, a wire controller can be installed in a heat pump air conditioner. When the heat pump air conditioner is powered on but not running and the ambient temperature is lower than the predetermined ambient temperature (that is, at the aforementioned triggering moment), the wire controller can send an ice warning prompt message to a predetermined application (APP), thereby prompting the user to perform relevant processing. The user can send the user instructions described in the aforementioned embodiment to the heat pump air conditioner in a timely manner through relevant operations based on the ice warning prompt message.

[0052] Further, Figure 2 The system structure diagram of the heat pump air conditioner according to one embodiment of the present application is schematically shown. Figure 2 The heat pump air conditioner 200 may include a fluorine side system 210, a water side system 220, a heat exchanger 230, a controller 240, and a first temperature control solenoid valve 250. The first temperature control solenoid valve may include an energized coil, a temperature control timing mechanical part, and a valve.

[0053] The fluorine-side system 210 and the water-side system 220 are connected via a heat exchanger 230. A first temperature-controlled solenoid valve 250 is located at the bottom of the heat exchanger 230. A controller 240 is electrically connected to the first temperature-controlled solenoid valve 250 and the fluorine-side system 210. The controller 240 can also be selectively electrically connected to other components of the heat pump air conditioner (e.g., the water-side system 220). The controller 240 can be a wired controller or a centralized controller.

[0054] Furthermore, in one embodiment, the heat pump air conditioner 200 further includes a water tank 260, with a second temperature-controlled solenoid valve 270 disposed at the bottom of the water tank 260. The second temperature-controlled solenoid valve 270 may include an energized coil, a temperature-controlled timing mechanism, and a valve. The controller 240 may be electrically connected to the second temperature-controlled solenoid valve 250.

[0055] When the heat pump air conditioner 200 is powered on but not running, the controller 240 can perform the following operations: monitoring whether the ambient temperature is lower than a predetermined ambient temperature (for example, monitoring the ambient temperature through a preset temperature sensor); if the ambient temperature is lower than the predetermined ambient temperature, first determining the expected freezing time of the water in the heat pump air conditioner; and then, based on the expected freezing time, controlling the heat pump air conditioner 200 to perform a preset antifreeze protection operation, thereby preventing the water in the heat pump air conditioner 200 from freezing and damaging the protection device.

[0056] Among them, when controlling the heat pump air conditioner 200 to perform the preset antifreeze protection operation according to the expected time required for freezing, specifically: determining the first antifreeze protection time according to the expected time required for freezing; when no user instruction is received after the first antifreeze protection time, controlling the heat pump air conditioner to operate and heat according to a predetermined mode.

[0057] Among them, the first antifreeze protection time is determined according to the expected time required for freezing, which can specifically include: determining the trigger moment when the ambient temperature is lower than the predetermined ambient temperature; adding the trigger moment, the expected time required for freezing and the predetermined delay time to obtain the first antifreeze protection time.

[0058] First, determine the moment when the ambient temperature is lower than the predetermined ambient temperature as the trigger moment, then add the trigger moment, the estimated time required for freezing, and the predetermined delay time, and use the summed time as the first antifreeze protection time. That is, the first antifreeze protection time (hours) = trigger moment + estimated time required for freezing + predetermined delay time (for example, 8 hours). The first antifreeze protection time is based on the estimated time required for freezing plus the predetermined delay time. When no user instruction is received after the first antifreeze protection time, the heat pump air conditioner is controlled to operate and heat according to the predetermined mode. This ensures timely antifreeze protection while allowing the user to have enough time to perform related operations and transmit user instructions, further improving the user experience of the protection process.

[0059] In addition, a second antifreeze protection time can also be determined, and the second antifreeze protection time is greater than the first antifreeze protection time; when no user instruction is received after the second antifreeze protection time, the heat pump air conditioner is controlled to stop heating, and the valves of the first temperature control solenoid valve 250 and / or the second temperature control solenoid valve 270 are controlled to open for drainage through the energized coils in the first temperature control solenoid valve 250 and / or the second temperature control solenoid valve 270.

[0060] The second antifreeze protection time is longer than the first antifreeze protection time. For example, the second antifreeze protection time = trigger time + 24 hours. If no user command is received after the second antifreeze protection time, the heat pump air conditioner is controlled to stop heating and the energized coil in the temperature control solenoid valve controls the valve to open for drainage, thereby draining all water from the heat pump air conditioner to prevent water from freezing.

[0061] Furthermore, when the heat pump air conditioner 200 is not powered on, the temperature control timing mechanical portion of the first temperature control solenoid valve 250 and / or the second temperature control solenoid valve 270 can perform the following operations: monitoring whether the heat pump air conditioner 200 meets the active drainage condition; and when the active drainage condition is met, the temperature control timing mechanical portion of the temperature control solenoid valve 250 actively opens the valve to drain the heat pump air conditioner. Draining the water in the heat pump air conditioner can prevent the water in the heat pump air conditioner from freezing and damaging the protective device. The active drainage condition refers to the time period when the water temperature in the heat pump air conditioner is lower than a predetermined temperature and exceeds a predetermined protection time period. The predetermined protection time period can be set according to actual conditions. For example, in one example, the predetermined protection time period can be equal to the expected freezing time period. In other examples, the predetermined protection time period can be a period of time greater than the expected freezing time period.

[0062] Furthermore, in one embodiment, the heat exchanger 230 includes a water inlet 231 and a water outlet 232. The water inlet 231 is provided with a water flow switch 234. The water flow switch can be used to determine whether the water pump in the water-side system 220 is turned on. For example, a closed state of the water flow switch indicates that the water pump is turned on and the water in the system is circulating.

[0063] Then, when it is determined based on the water flow switch that the water pump is not turned on, the estimated time required for freezing can be calculated based on the total water volume in the heat pump air conditioner, the total surface area of the pipes and water tank in the heat pump air conditioner, and the absolute value of the ambient temperature.

[0064] Alternatively, when the water pump is turned on according to the water flow switch, the estimated time required for freezing is calculated based on the total water volume and water flow in the heat pump air conditioner, the estimated total surface area of the pipes and water tank in the heat pump air conditioner, and the absolute value of the external ambient temperature.

[0065] The first method uses the total water volume (V) in the heat pump air conditioner, the total surface area of the heat pump air conditioner's pipes and water tank (A), and the absolute value of the ambient temperature (T) to calculate the expected freezing time (tfreeze). This method can accurately calculate the expected freezing time, thereby ensuring the effectiveness of antifreeze protection control.

[0066] Specifically, in one example, the estimated time required for freezing (tfreeze) can be calculated according to the formula tfreeze≈(1000*V) / (A*T). According to this formula, the estimated time required for freezing can be accurately calculated based on the total water volume (V) in the heat pump air conditioner, the total surface area of the pipes and water tanks in the heat pump air conditioner (A), and the absolute value of the ambient temperature (T).

[0067] The second method calculates the estimated freezing time (tfreeze) based on the total water volume (V) in the heat pump air conditioner, the water flow rate (S), the estimated total surface area of the heat pump air conditioner's pipes and water tank (A), and the absolute value of the external ambient temperature (T). This method can further accurately calculate the estimated freezing time, thereby further ensuring the effectiveness of antifreeze protection control. In particular, in heat pump systems, the accuracy of the estimated freezing time can be further improved when the water pump is turned on to circulate water.

[0068] Furthermore, when the heat pump air conditioner is powered on but not running and the ambient temperature is lower than a predetermined ambient temperature, the method may further include sending an icing warning message to the user.

[0069] For example, when the heat pump air conditioner is powered on but not running and the ambient temperature is lower than the predetermined ambient temperature (that is, at the aforementioned triggering moment), the controller 240 can send an ice warning prompt message to the predetermined application (APP), thereby prompting the user to perform relevant processing. The user can send the user instructions described in the aforementioned embodiment to the heat pump air conditioner in a timely manner through relevant operations based on the ice warning prompt message.

[0070] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed herein.

[0071] It should be understood that the present application is not limited to the embodiments that have been described above and shown in the accompanying drawings, but various modifications and changes may be made without departing from the scope thereof.

Claims

1. A method for controlling antifreeze protection, characterized in that: Applicable to a heat pump air conditioner, wherein the heat pump air conditioner includes a temperature control solenoid valve; the method includes: When the heat pump air conditioner is powered on but not running and the ambient temperature is lower than a predetermined ambient temperature, determining an estimated freezing time of water in the heat pump air conditioner, and controlling the heat pump air conditioner to perform a preset antifreeze protection operation according to the estimated freezing time; When the heat pump air conditioner is not powered on, the temperature control solenoid valve is used to monitor whether the heat pump air conditioner meets the active drainage condition, and when the active drainage condition is met, the temperature control solenoid valve opens the valve to drain the heat pump air conditioner. The active drainage condition refers to the time when the water temperature is lower than the predetermined temperature exceeding the predetermined protection time.

2. The method according to claim 1, characterized in that The method for calculating the estimated freezing duration includes: The estimated freezing time is calculated based on the total amount of water in the heat pump air conditioner, the total surface area of the pipes and water tank in the heat pump air conditioner, and the absolute value of the ambient temperature; Alternatively, the estimated freezing time is calculated based on the total water volume and water flow in the heat pump air conditioner, the estimated total surface area of the pipes and water tank in the heat pump air conditioner, and the absolute value of the external ambient temperature.

3. The method according to claim 1, characterized in that The controlling the heat pump air conditioner to perform a preset antifreeze protection operation according to the estimated freezing time includes: Determining a first antifreeze protection time according to the estimated freezing time; When no user instruction is received after the first antifreeze protection time has passed, the heat pump air conditioner is controlled to operate for heating according to a predetermined mode.

4. The method according to claim 3, characterized in that The method further comprises: determining a second antifreeze protection time, wherein the second antifreeze protection time is greater than the first antifreeze protection time; When the second antifreeze protection time is exceeded and the user instruction is not received, the heat pump air conditioner is controlled to stop heating, and the valve is controlled to open for drainage through the energized coil in the temperature control solenoid valve.

5. The method according to claim 3, characterized in that The determining of the first antifreeze protection time according to the estimated freezing time includes: Determine the triggering moment when the ambient temperature is lower than the predetermined ambient temperature; The first antifreeze protection time is obtained by adding the triggering moment, the estimated freezing time, and the predetermined delay time.

6. The method according to claim 3, characterized in that The method further comprises: When the heat pump air conditioner is powered on but not running and the ambient temperature is lower than a predetermined ambient temperature, an icing warning message is sent to the user.

7. A heat pump air conditioner, characterized in that: The heat pump air conditioner comprises: Fluorine side system and water side system; A heat exchanger, the fluorine side system and the water side system are connected through the heat exchanger; a temperature control solenoid valve is provided at the bottom of the heat exchanger; A controller is electrically connected to the temperature control solenoid valve and the fluorine side system.

8. The heat pump air conditioner according to claim 7, characterized in that: The heat pump air conditioner further comprises a water tank, and the temperature control solenoid valve is also arranged at the bottom of the water tank.

9. The heat pump air conditioner according to claim 7 or 8, characterized in that: The temperature-controlled solenoid valve includes an energized coil, a temperature-controlled timing mechanical part, and a valve.

10. The heat pump air conditioner according to claim 7, characterized in that: The heat exchanger includes a water inlet and a water outlet, and the water inlet is provided with a water flow switch.

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