Constant heating defrosting system, defrosting control method and device for heat recovery air conditioner

Abstract

This application provides a constant-temperature defrosting system, defrosting control method, and device for a heat recovery air conditioner. The system includes: a first heating circuit composed of a compressor, a first solenoid valve, a water tank, a first expansion valve, a first check valve, a second solenoid valve, an outdoor heat exchanger, and a four-way valve; a first defrosting circuit composed of a compressor, a first solenoid valve, a water tank, a first expansion valve, a first check valve, a third solenoid valve, an energy storage tank, a fourth solenoid valve, and a four-way valve; a second defrosting circuit composed of a compressor, a fifth solenoid valve, a second check valve, an outdoor heat exchanger, and a four-way valve; and a single-hot water defrosting circuit composed of the first heating circuit, the first defrosting circuit, and the second defrosting circuit. This solves the problem in existing technologies where the air conditioner's failure to heat during defrosting affects user comfort.

Description

Technical Field

[0001] This application relates to the field of constant temperature defrosting technology for heat recovery air conditioners, and more specifically, to a constant temperature defrosting system, defrosting control method, defrosting control device, computer-readable storage medium, and electronic device for heat recovery air conditioners. Background Technology

[0002] With the advancement of technology, the market demand for air-cooled air conditioning heat pump units with heat recovery is gradually increasing. When air-cooled air conditioning heat pump units operate in low-temperature environments for heating, the lower the outdoor ambient temperature, the more severe the frost buildup on the outdoor heat exchanger, resulting in lower heat exchange efficiency. Once the frost thickness reaches a certain level, defrosting control is activated to ensure the overall reliability of the unit. Currently, the commonly used defrosting control method involves using a four-way valve to switch to cooling mode to defrost the outdoor heat exchanger. During defrosting, because the air conditioner is not heating, indoor temperature fluctuations are likely to occur. If the defrosting time is too long, it can also affect the user's comfort experience. Summary of the Invention

[0003] The main objective of this application is to provide a constant-temperature defrosting system, defrosting control method, defrosting control device, computer-readable storage medium, and electronic device for a heat recovery air conditioner, so as to at least solve the problem that the lack of heating during defrosting of the outdoor heat exchanger in the prior art affects the user's comfort experience.

[0004] To achieve the above objectives, according to one aspect of this application, a constant-temperature defrosting system for a heat recovery air conditioner is provided. The system includes: a compressor, a first solenoid valve, a water tank, a first expansion valve, a first one-way valve, a second solenoid valve, an outdoor heat exchanger, a four-way valve, a third solenoid valve, an energy storage tank, a fourth solenoid valve, a fifth solenoid valve, and a second one-way valve; wherein the compressor, the first solenoid valve, the water tank, the first expansion valve, the first one-way valve, the second solenoid valve, the outdoor heat exchanger, and the four-way valve are sequentially connected to form a first heating circuit. The first port of the valve is connected to the outdoor heat exchanger, and the second port is connected to the compressor; the compressor, the first solenoid valve, the water tank, the first expansion valve, the first check valve, the third solenoid valve, the energy storage tank, the fourth solenoid valve, and the four-way valve are connected in sequence to form a first defrosting circuit; the compressor, the fifth solenoid valve, the second check valve, the outdoor heat exchanger, and the four-way valve are connected in sequence to form a second defrosting circuit; the first heating circuit, the first defrosting circuit, and the second defrosting circuit form a single-function hot water defrosting circuit.

[0005] Optionally, the system further includes: a sixth solenoid valve, an indoor heat exchanger, and a second expansion valve; wherein the compressor, the sixth solenoid valve, the four-way valve, the indoor heat exchanger, the second expansion valve, the second solenoid valve, the outdoor heat exchanger, and the four-way valve are sequentially connected to form a second heating circuit, wherein the third port of the four-way valve is connected to the sixth solenoid valve and the fourth port is connected to the indoor heat exchanger; the second heating circuit, the first defrosting circuit, and the second defrosting circuit form a single heating defrosting circuit.

[0006] Optionally, the heating and hot water defrosting circuits are composed of the first heating circuit, the second heating circuit, the first defrosting circuit, and the second defrosting circuit.

[0007] Optionally, the water tank and the energy storage tank include a heat exchanger.

[0008] According to another aspect of this application, a defrosting control method is provided for a constant-temperature defrosting system applied to any of the heat recovery air conditioners, comprising: upon receiving a defrosting signal from the heat recovery air conditioner, controlling a second solenoid valve to close, and controlling a third, fourth, and fifth solenoid valve to open to defrost the outdoor heat exchanger; monitoring a first temperature of the outdoor heat exchanger in real time, and if the first temperature is greater than a first temperature setpoint, controlling the second solenoid valve to open, and controlling the third, fourth, and fifth solenoid valves to close to end the defrosting process.

[0009] Optionally, during the real-time monitoring of the first temperature of the outdoor heat exchanger, the method further includes: real-time monitoring of the second temperature of the energy storage tank; and heating the energy storage tank when the second temperature is lower than a second temperature set value until the second temperature of the energy storage tank reaches a third temperature set value, wherein the third temperature set value is greater than the second temperature set value.

[0010] Optionally, the method includes: upon receiving a mode switching instruction, switching the operating mode of the system according to the mode switching instruction, wherein the operating mode includes: heating and hot water defrosting mode, heating-only defrosting mode, and hot water-only defrosting mode.

[0011] According to another aspect of this application, a defrosting control device is provided for a constant-temperature defrosting system of any of the heat recovery air conditioners, comprising: a first control unit, configured to, upon receiving a defrosting signal from the heat recovery air conditioner, control a second solenoid valve to close and control a third, fourth, and fifth solenoid valve to open to perform defrosting on the outdoor heat exchanger; and a second control unit, configured to monitor a first temperature of the outdoor heat exchanger in real time, and, if the first temperature is greater than a first temperature setpoint, control the second solenoid valve to open and control the third, fourth, and fifth solenoid valves to close to end the defrosting process.

[0012] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the defrosting control methods described above.

[0013] According to another aspect of this application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing any of the defrosting control methods described above.

[0014] The system, using the technical solution of this application, includes: a compressor, a first solenoid valve, a water tank, a first expansion valve, a first check valve, a second solenoid valve, an outdoor heat exchanger, a four-way valve, a third solenoid valve, an energy storage tank, a fourth solenoid valve, a fifth solenoid valve, and a second check valve; wherein, the compressor, the first solenoid valve, the water tank, the first expansion valve, the first check valve, the second solenoid valve, the outdoor heat exchanger, and the four-way valve are sequentially connected to form a first heating circuit, with the first port of the four-way valve connected to the outdoor heat exchanger and the second port connected to the compressor; the compressor, the first solenoid valve, the water tank, the first expansion valve, the first check valve, the third solenoid valve, the energy storage tank, the fourth solenoid valve, and the four-way valve are sequentially connected to form a first defrosting circuit; the compressor, the fifth solenoid valve, the second check valve, the outdoor heat exchanger, and the four-way valve are sequentially connected to form a second defrosting circuit; and the first heating circuit, the first defrosting circuit, and the second defrosting circuit constitute a single-function hot water defrosting circuit. By combining the first heating circuit, the first defrosting circuit, and the second defrosting circuit, not only is the defrosting efficiency of the outdoor heat exchanger improved, but the storage and release of heat energy in the energy storage tank also ensures the stability of indoor heating and hot water supply. By changing the flow direction of the refrigerant and utilizing the heat of the high-temperature refrigerant to defrost the outdoor heat exchanger, the air conditioner can continuously heat without delaying defrosting, thus maintaining a stable indoor temperature and ensuring the heat exchange efficiency of the air conditioner. This solves the problem in existing technologies where the air conditioner does not heat during the defrosting process of the outdoor heat exchanger, affecting the user's comfort experience. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 A structural diagram of a constant-temperature defrosting system for a heat recovery air conditioner provided according to an embodiment of this application is shown;

[0017] Figure 2 A schematic flowchart of a defrosting control method according to an embodiment of this application is shown;

[0018] Figure 3 A schematic flowchart of a specific defrosting control method provided according to an embodiment of this application is shown;

[0019] Figure 4 A structural block diagram of a defrosting control device provided according to an embodiment of this application is shown.

[0020] The above figures include the following reference numerals:

[0021] 1. Compressor; 2. First solenoid valve; 3. Water tank; 4. First expansion valve; 5. First check valve; 6. Second solenoid valve; 7. Outdoor heat exchanger; 8. Four-way valve; 81. First port; 82. Second port; 83. Third port; 84. Fourth port; 9. Sixth solenoid valve; 10. Indoor heat exchanger; 11. Second expansion valve; 12. Third solenoid valve; 13. Energy storage tank; 14. Fourth solenoid valve; 15. Fifth solenoid valve; 16. Second check valve. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] As described in the background section, in the prior art, the lack of heating during the defrosting process of the outdoor heat exchanger affects the user's comfort experience. To solve the problem of the lack of heating during the defrosting process of the outdoor heat exchanger, the embodiments of this application provide a constant heating defrosting system for a heat recovery air conditioner, a defrosting control method, a defrosting control device, a computer-readable storage medium, and an electronic device.

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0027] Figure 1 This is a structural diagram of a constant-temperature defrosting system for a heat recovery air conditioner according to an embodiment of this application, as shown below. Figure 1 As shown, the system includes:

[0028] Compressor 1, First Solenoid Valve 2, Water Tank 3, First Expansion Valve 4, First Check Valve 5, Second Solenoid Valve 6, Outdoor Heat Exchanger 7, Four-Way Valve 8, Third Solenoid Valve 12, Energy Storage Water Tank 13, Fourth Solenoid Valve 14, Fifth Solenoid Valve 15, Second Check Valve 16.

[0029] Specifically, the compressor, as the core component of the heat pump system, is responsible for the compression and circulation of the refrigerant; the first, second, third, fourth, and fifth solenoid valves control the flow of the refrigerant, enabling the system to switch between heating and defrosting modes; the water tank and the energy storage tank are used to store hot water, with the water tank directly connected to the heating circuit for daily hot water supply; the energy storage tank plays a role in storing heat energy during the defrosting process, ensuring the supply of hot water during defrosting.

[0030] The first heating circuit is formed by sequentially connecting the compressor 1, the first solenoid valve 2, the water tank 3, the first expansion valve 4, the first check valve 5, the second solenoid valve 6, the outdoor heat exchanger 7, and the four-way valve 8. The first port 81 of the four-way valve 8 is connected to the outdoor heat exchanger 7, and the second port 82 is connected to the compressor 1.

[0031] The first defrosting circuit is formed by sequentially connecting the compressor 1, the first solenoid valve 2, the water tank 3, the first expansion valve 4, the first check valve 5, the third solenoid valve 12, the energy storage water tank 13, the fourth solenoid valve 14, and the four-way valve 8.

[0032] The compressor 1, the fifth solenoid valve 15, the second check valve 16, the outdoor heat exchanger 7, and the four-way valve 8 are connected in sequence to form the second defrosting circuit.

[0033] The first heating circuit, the first defrosting circuit, and the second defrosting circuit described above constitute a single-system hot water defrosting circuit.

[0034] In the single-system hot water defrosting circuit, the indoor heat exchanger does not participate in heat exchange, and the water tank acts as a condenser, forming a heating cycle circuit with the outdoor heat exchanger (evaporator), compressor, first expansion valve 4, four-way valve, first solenoid valve, second solenoid valve, and first one-way valve through the refrigerant pipeline.

[0035] Specifically, when the air conditioner is heating and defrosting, the flow of refrigerant is adjusted so that the refrigerant, after being throttled, flows to the energy storage tank for evaporation and heat exchange before returning to the compressor. At the same time, the high-temperature refrigerant discharged from the compressor is controlled to flow into the outdoor heat exchanger through the bypass pipe to defrost the outdoor heat exchanger.

[0036] In this embodiment, the combination of the first heating circuit, the first defrosting circuit, and the second defrosting circuit not only improves the defrosting efficiency of the outdoor heat exchanger but also ensures the stability of indoor heating and hot water supply through the storage and release of heat energy in the energy storage tank. By changing the flow direction of the refrigerant and utilizing the heat of the high-temperature refrigerant to defrost the outdoor heat exchanger, the air conditioner can continuously heat without delaying defrosting, maintaining a stable indoor temperature and ensuring the heat exchange efficiency of the air conditioner. This solves the problem in the prior art where the air conditioner does not heat during the defrosting process of the outdoor heat exchanger, affecting the user's comfort experience.

[0037] As an optional embodiment, such as Figure 1As shown, the system further includes: a sixth solenoid valve 9, an indoor heat exchanger 10, and a second expansion valve 11; wherein, the compressor 1, the sixth solenoid valve 9, the four-way valve 8, the indoor heat exchanger 10, the second expansion valve 11, the second solenoid valve 6, the outdoor heat exchanger 7, and the four-way valve 8 are sequentially connected to form a second heating circuit, wherein the third port 83 of the four-way valve 8 is connected to the sixth solenoid valve 9, and the fourth port 84 is connected to the indoor heat exchanger 10; the second heating circuit, the first defrosting circuit, and the second defrosting circuit constitute a single heating defrosting circuit.

[0038] Specifically, the working principle of the single heating defrosting circuit is that the water tank does not participate in heat exchange. The indoor heat exchanger acts as a condenser and forms a heating cycle circuit with the outdoor heat exchanger (evaporator), compressor, second expansion valve 11, four-way valve, sixth solenoid valve and second solenoid valve through the refrigerant pipeline.

[0039] By adding an indoor heat exchanger and a second expansion valve, along with the control of a sixth solenoid valve, the system can more effectively transfer heat to the room in heating mode, improving the efficiency and comfort of indoor heating. The indoor heat exchanger, as the main component for heat exchange, works in conjunction with the second expansion valve to regulate the amount of heat entering the room, ensuring a stable indoor temperature.

[0040] As an optional embodiment, the heating and hot water defrosting circuit is composed of the first heating circuit, the second heating circuit, the first defrosting circuit, and the second defrosting circuit.

[0041] Specifically, the working principle of the heating and hot water defrosting circuit is that the indoor heat exchanger and water tank are both condensers, and together with the outdoor heat exchanger (evaporator), compressor, first expansion valve and second expansion valve, four-way valve, sixth solenoid valve, first solenoid valve and second solenoid valve, and first check valve, a heating cycle system is formed through the refrigerant pipeline.

[0042] By combining the first heating circuit, the second heating circuit, the first defrosting circuit, and the second defrosting circuit, the system can efficiently defrost the outdoor heat exchanger while maintaining indoor heating and hot water supply. The combination of the heating and hot water defrosting circuits achieves the system's multifunctionality and high efficiency, not only solving the heating and hot water supply problems during defrosting in low-temperature environments but also improving defrosting efficiency and the overall energy utilization efficiency of the system by optimizing the refrigerant circulation path.

[0043] As an optional embodiment, the water tank 3 and the energy storage tank 13 mentioned above include heat exchangers.

[0044] Specifically, the heat exchangers contained in the water tank and the energy storage tank are key components in the system for storing and releasing thermal energy. The heat exchangers store thermal energy in the water tank and energy storage tank through heat exchange with the refrigerant. When the system needs hot water supply or to maintain indoor heating during defrosting, the heat exchangers can release the stored thermal energy to meet the system's needs. This design not only improves the system's thermal energy utilization efficiency but also ensures the continuity of hot water supply and indoor heating during defrosting through the thermal energy storage in the energy storage tank, solving the thermal energy supply problem during defrosting in heat recovery air conditioning systems operating in low-temperature environments.

[0045] Figure 2 This is a flowchart of a defrosting control method according to an embodiment of this application. Figure 1 , Figure 2 As shown, the method includes the following steps:

[0046] Step S201: Upon receiving a defrost signal from the heat recovery air conditioner, control the second solenoid valve 6 to close, and control the third solenoid valve 12, the fourth solenoid valve 14 and the fifth solenoid valve 15 to open to defrost the outdoor heat exchanger 7.

[0047] Specifically, when the air conditioner enters the defrosting stage, the second solenoid valve closes, while the third and fourth solenoid valves open, allowing the refrigerant, throttled by the electronic expansion valve, to flow into the energy storage tank. The outdoor heat exchanger ceases heat exchange, and the energy storage tank acts as a second evaporator. After evaporating and exchanging heat in the energy storage tank, the refrigerant flows back to the compressor via the four-way valve for the next heating cycle, ensuring continuous heating. Simultaneously, the fifth solenoid valve opens, and the compressed, high-temperature refrigerant is discharged from the compressor and flows through the bypass pipe into the outdoor heat exchanger. The heat from the high-temperature refrigerant is used to defrost the outdoor heat exchanger. The refrigerant exiting the outdoor heat exchanger merges with the refrigerant from the energy storage tank and returns to the compressor.

[0048] Step S202: Monitor the first temperature of the outdoor heat exchanger 7 in real time. If the first temperature is greater than the first temperature set value, control the second solenoid valve 6 to open and control the third solenoid valve 12, the fourth solenoid valve 14 and the fifth solenoid valve 15 to close to end the defrosting process.

[0049] The first temperature setpoint can be set according to the specific defrosting requirements of the outdoor heat exchanger. In addition, defrosting can be monitored according to the set time. When the set defrosting time is reached, it is determined that defrosting is complete, and the third, fourth, and fifth solenoid valves are closed while the second solenoid valve is opened.

[0050] Specifically, once the outdoor heat exchanger has finished defrosting, the third, fourth, and fifth solenoid valves are closed, and the second solenoid valve is opened, allowing the outdoor heat exchanger to re-engage in heat exchange. The energy storage tank no longer participates in heat exchange, exits defrosting control, and the air conditioner enters normal heating mode.

[0051] In this embodiment, by applying steps S201 and S202 above and dynamically adjusting the state of the solenoid valves, efficient defrosting of the outdoor heat exchanger is achieved, while ensuring the continuity and stability of indoor heating and hot water supply. Upon receiving a defrost signal, by closing the second solenoid valve and opening the third, fourth, and fifth solenoid valves, the system can prioritize the use of heat generated by the compressor for defrosting the outdoor heat exchanger, improving defrosting efficiency. Simultaneously, by monitoring the temperature of the outdoor heat exchanger in real time, the system can automatically end the defrosting process and restore normal heating and hot water supply when the temperature reaches the set value, avoiding energy waste caused by excessive defrosting. This control method not only solves the efficiency and stability problems of defrosting heat recovery air conditioners in low-temperature environments but also improves the system's automation level and user comfort through flexible control of the solenoid valves. It solves the problem in existing technologies where the lack of heating during outdoor heat exchanger defrosting affects user comfort.

[0052] In the specific implementation process, during the real-time monitoring of the first temperature of the outdoor heat exchanger 7, the method further includes: real-time monitoring of the second temperature of the energy storage tank 13, and when the second temperature is lower than the second temperature set value, heating the energy storage tank 13 until the second temperature of the energy storage tank 13 reaches the third temperature set value, wherein the third temperature set value is greater than the second temperature set value.

[0053] The second temperature setting can be configured according to the specific heating requirements of the energy storage tank, such as 7℃, 10℃, or 15℃. The third temperature setting can be set to 35℃. Furthermore, the water in the energy storage tank can be used for domestic purposes, and a water temperature close to human body temperature can be selected. Heating will stop when the programmed water temperature of 35℃ is reached.

[0054] Specifically, since the water in the energy storage tank is supplied by tap water pipes, the water temperature is low in low-temperature environments. Furthermore, when the energy storage tank acts as an evaporator, evaporation absorbs heat, further lowering the tank's temperature and potentially causing it to freeze, thus affecting its heat exchange efficiency. Therefore, the temperature of the energy storage tank must be above the second temperature setpoint. When the temperature of the energy storage tank falls below the second temperature setpoint, hot water can be introduced from the tank (including the heat exchanger) to heat the tank and raise the water temperature. The water in the energy storage tank can be consumed as domestic water.

[0055] This method not only ensures a hot water supply during defrosting but also improves the system's defrosting efficiency and energy utilization efficiency by preheating the energy storage tank. This design solves the problem of insufficient heat energy in the energy storage tank during defrosting in heat recovery air conditioning systems operating in low-temperature environments. By monitoring the temperature of the energy storage tank and heating it in a timely manner, the overall efficiency and energy utilization of the system are ensured, significantly improving the operating performance and user experience of heat recovery air conditioning systems in low-temperature environments.

[0056] Specifically, the above method includes: upon receiving a mode switching instruction, switching the operating mode of the system according to the mode switching instruction, wherein the operating mode includes: heating and hot water defrosting mode, heating-only defrosting mode, and hot water-only defrosting mode.

[0057] Among them, the circuit corresponding to the heating and hot water defrosting modes is the heating and hot water defrosting circuit; the circuit corresponding to the single heating defrosting mode is the single heating defrosting circuit; and the circuit corresponding to the single hot water defrosting mode is the single hot water defrosting circuit.

[0058] This method adjusts to the corresponding defrosting circuit based on the switching command, and achieves flexible switching between different operating modes by receiving mode switching commands. This mode switching mechanism not only improves the system's adaptability and flexibility, but also improves the overall system efficiency and energy utilization efficiency by optimizing the solenoid valve control logic in each mode, thus solving the mode switching problem of heat recovery air conditioning defrosting in low-temperature environments.

[0059] In addition, this embodiment also includes an intelligent frost monitoring and prediction mechanism. Advanced frost monitoring sensors are installed on the outdoor heat exchanger to detect the frost thickness on the heat exchanger surface in real time. Simultaneously, machine learning algorithms are used to predict the frost formation rate and thickness based on historical data (such as outdoor temperature, humidity, and operating mode), thereby intelligently adjusting the defrosting start time and frequency. For example, when it is predicted that the frost layer is about to reach a critical thickness affecting heat exchange efficiency, the system can initiate the defrosting program in advance to avoid over-defrosting or under-defrosting.

[0060] This method can significantly improve the accuracy and efficiency of defrosting, reduce unnecessary energy consumption, and ensure the stable operation of the air conditioning system. Intelligent prediction of frost formation can reduce the impact of defrosting on indoor temperature, further enhancing user comfort.

[0061] This embodiment also includes dynamic heat recovery and distribution. An intelligent heat recovery module is added between the energy storage tank and the water tank. This module can dynamically extract hot water from the water tank according to the temperature of the energy storage tank and the defrosting requirements of the outdoor heat exchanger, and heat the water in the energy storage tank through heat exchange. At the same time, the recovered heat in the energy storage tank is intelligently distributed according to the indoor temperature and user needs. It can be used to accelerate the defrosting of the outdoor heat exchanger or for indoor heating, realizing efficient recycling of heat energy.

[0062] This method not only improves the efficiency of heat recovery but also enhances the system's flexibility, enabling it to better adapt to defrosting needs under different environmental conditions. Through dynamic heat recovery and distribution, the air conditioning system can maintain stable indoor temperature during defrosting while reducing energy consumption and improving the overall system's energy efficiency ratio.

[0063] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the defrosting control method of this application will be described in detail below with reference to specific embodiments.

[0064] This embodiment relates to a specific defrosting control method. The heat recovery air conditioner in this embodiment mainly includes a compressor 1, a four-way valve 8, multiple electronic expansion valves, an indoor heat exchanger 10, an outdoor heat exchanger 7, a water tank 3 (including a heat exchanger), an energy storage water tank 13 (including a heat exchanger), multiple solenoid valves, multiple one-way valves, and refrigerant connection pipelines. Figure 1 and Figure 3 As shown, it specifically includes the following:

[0065] The energy storage tank 13 (including a heat exchanger) is connected in parallel with the outdoor heat exchanger 7. A bypass pipe is added between the exhaust port of the compressor 1 and the inlet of the outdoor heat exchanger 7. A solenoid valve is installed on this pipe to control the refrigerant flow. When the solenoid valve is open, the refrigerant flows through; when it is closed, the refrigerant does not flow through. A one-way valve is also installed to control the direction of the refrigerant flow. When the air conditioner is defrosting in heating mode, the refrigerant flow is adjusted so that the throttled refrigerant flows to the energy storage tank 13 for evaporation and heat exchange before returning to the compressor 1. Simultaneously, the high-temperature refrigerant discharged from the compressor 1 is controlled to flow into the outdoor heat exchanger 7 through the bypass pipe to defrost the outdoor heat exchanger 7. The entire defrosting process does not require reversing the four-way valve 8, thus achieving constant-temperature defrosting for the air conditioner.

[0066] Heat recovery air conditioners can be divided into three heating operation modes: heating and hot water mode, heating only mode, and hot water only mode.

[0067] The working principle of the heating and hot water modes is that the indoor heat exchanger 10 and water tank 3 are both condensers, and together with the outdoor heat exchanger 7 (evaporator), compressor 1, first expansion valve 4 and second expansion valve 11, four-way valve 8, sixth solenoid valve 9, first solenoid valve 2 and second solenoid valve 6, and first one-way valve 5, a heating cycle system is formed through the refrigerant pipeline.

[0068] The working principle of the single heating mode is that the water tank 3 does not participate in heat exchange. The indoor heat exchanger 10 acts as a condenser and forms a heating cycle system with the outdoor heat exchanger 7 (evaporator), compressor 1, second expansion valve 11, four-way valve 8, sixth solenoid valve 9 and second solenoid valve 6 through the refrigerant pipeline.

[0069] In the single-hot water mode, the indoor heat exchanger 10 does not participate in heat exchange. The water tank 3 acts as a condenser and forms a heating circulation system with the outdoor heat exchanger 7 (evaporator), compressor 1, first expansion valve 4, four-way valve 8, first solenoid valve 2, second solenoid valve 6, and first one-way valve 5 through refrigerant piping. These three heating operation modes can operate independently or be switched between each other as needed.

[0070] The defrosting control logic of the heat recovery air conditioner in this embodiment is as follows:

[0071] When the air conditioner enters the defrosting stage, the second solenoid valve 6 is closed, and the third solenoid valve 12 and the fourth solenoid valve 14 are opened, allowing the refrigerant, which has been throttled by the electronic expansion valve, to flow into the energy storage tank 13. The outdoor heat exchanger 7 no longer exchanges heat. At this time, the energy storage tank 13 is equivalent to a second evaporator. After the refrigerant evaporates and exchanges heat in the energy storage tank 13, it flows back to the compressor 1 through the four-way valve 8 to start the next heating cycle, allowing the air conditioner to continuously heat. At the same time, the fifth solenoid valve 15 is opened, and the compressed high-temperature refrigerant is discharged from the compressor 1 and flows into the outdoor heat exchanger 7 through the bypass pipe. The heat of the high-temperature refrigerant is used to defrost the outdoor heat exchanger 7. The refrigerant coming out of the outdoor heat exchanger 7 and the refrigerant coming out of the energy storage tank 13 are combined and return to the compressor 1. Once the outdoor heat exchanger 7 has finished defrosting, the control closes the fifth solenoid valve 15, the third solenoid valve 12, and the fourth solenoid valve 14, and opens the second solenoid valve 6, allowing the outdoor heat exchanger 7 to re-engage in heat exchange. The energy storage tank 13 no longer participates in heat exchange, exits defrosting control, and the air conditioner enters normal heating mode.

[0072] Since the water in the energy storage tank 13 is introduced from the tap water pipe, the water temperature is low in low-temperature environments. Furthermore, when the energy storage tank 13 acts as an evaporator for heat exchange, the evaporation absorbs heat, causing the temperature of the energy storage tank 13 to drop even lower or even freeze, thus affecting its heat exchange efficiency. Therefore, the temperature of the energy storage tank 13 needs to be above a preset temperature T (for example, the preset temperature T can be set to 7℃). When the temperature of the energy storage tank 13 is lower than the preset temperature T, hot water can be introduced from the water tank 3 (including the heat exchanger) to heat the energy storage tank 13 and raise its temperature. The water in the energy storage tank 13 can be consumed as domestic water.

[0073] This embodiment changes the flow direction of the refrigerant and uses the heat of the high-temperature refrigerant to defrost the outdoor heat exchanger 7, thereby enabling the air conditioner to continuously heat without delaying defrosting, maintaining a stable indoor temperature, ensuring the heat exchange efficiency of the air conditioner, and improving the user's comfort experience.

[0074] This application also provides a defrosting control device. It should be noted that the defrosting control device of this application can be used to execute the defrosting control method provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0075] The defrosting control device provided in the embodiments of this application will be described below.

[0076] Figure 4 This is a schematic diagram of a defrosting control device according to an embodiment of this application. Figure 4 As shown, the device includes:

[0077] The first control unit 41 is used to control the second solenoid valve to close and the third, fourth and fifth solenoid valves to open to defrost the outdoor heat exchanger when it receives a defrost signal from the heat recovery air conditioner.

[0078] The second control unit 42 is used to monitor the first temperature of the outdoor heat exchanger in real time. When the first temperature is greater than the first temperature set value, it controls the second solenoid valve to open and controls the third, fourth and fifth solenoid valves to close to end the defrosting process.

[0079] In this embodiment, the first control unit, upon receiving a defrost signal from the heat recovery air conditioner, controls the second solenoid valve to close and the third, fourth, and fifth solenoid valves to open to defrost the outdoor heat exchanger. The second control unit monitors the first temperature of the outdoor heat exchanger in real time. If the first temperature exceeds a set first temperature value, it controls the second solenoid valve to open and the third, fourth, and fifth solenoid valves to close to end the defrost process. By dynamically adjusting the state of the solenoid valves, efficient defrosting of the outdoor heat exchanger is achieved, while ensuring the continuity and stability of indoor heating and hot water supply. Upon receiving a defrost signal, by closing the second solenoid valve and opening the third, fourth, and fifth solenoid valves, the system can prioritize the use of heat generated by the compressor for defrosting the outdoor heat exchanger, improving defrost efficiency. Simultaneously, by monitoring the temperature of the outdoor heat exchanger in real time, when the temperature reaches the set value, the defrost process can be automatically ended, restoring normal heating and hot water supply, avoiding energy waste caused by excessive defrosting. This technology not only solves the efficiency and stability issues of heat recovery air conditioners during defrosting in low-temperature environments, but also improves the system's automation level and user comfort through flexible control of solenoid valves. It also addresses the problem in existing technologies where the air conditioner stops heating during defrosting of the outdoor heat exchanger, thus affecting user comfort.

[0080] As an optional solution, the device also includes a monitoring unit for monitoring the second temperature of the energy storage tank in real time while monitoring the first temperature of the outdoor heat exchanger in real time. If the second temperature is lower than the second temperature set value, the energy storage tank is heated until the second temperature of the energy storage tank reaches the third temperature set value, wherein the third temperature set value is greater than the second temperature set value.

[0081] Specifically, this not only ensures a hot water supply during defrosting but also improves the system's defrosting efficiency and energy utilization efficiency by preheating the energy storage tank. This design solves the problem of insufficient heat energy in the energy storage tank during defrosting in heat recovery air conditioners at low temperatures. By monitoring the temperature of the energy storage tank and heating it in a timely manner, the overall efficiency and energy utilization of the system are ensured, significantly improving the operating performance and user experience of heat recovery air conditioners in low-temperature environments.

[0082] In an optional embodiment, the device further includes a switching unit for switching the operating mode of the system according to the mode switching instruction received, wherein the operating modes include: heating and hot water defrosting mode, heating-only defrosting mode, and hot water-only defrosting mode.

[0083] Specifically, the system adjusts to the corresponding defrosting circuit based on the switching command, and achieves flexible switching between different operating modes by receiving mode switching commands. This mode switching mechanism not only improves the system's adaptability and flexibility, but also enhances the overall system efficiency and energy utilization efficiency by optimizing the solenoid valve control logic in each mode, thus solving the mode switching problem during defrosting in heat recovery air conditioning systems operating in low-temperature environments.

[0084] The aforementioned defrosting control device includes a processor and a memory. The first control unit and the second control unit, etc., are all stored as program units in the memory, and the processor executes the program units stored in the memory to achieve the corresponding functions. All of the above modules are located in the same processor; alternatively, the various modules may be located in different processors in any combination.

[0085] The processor contains a kernel, which retrieves the corresponding program unit from memory. One or more kernels can be configured, and adjusting kernel parameters can address the problem in existing technologies where the air conditioner stops heating during defrosting of the outdoor heat exchanger, thus affecting user comfort.

[0086] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0087] This invention provides a computer-readable storage medium including a stored program, wherein the program, when running, controls the device containing the computer-readable storage medium to perform the defrosting control method.

[0088] Specifically, defrosting control methods include:

[0089] Step S201: Upon receiving a defrost signal from the heat recovery air conditioner, control the second solenoid valve to close and control the third, fourth and fifth solenoid valves to open to defrost the outdoor heat exchanger.

[0090] Step S202: Monitor the first temperature of the outdoor heat exchanger in real time. If the first temperature is greater than the first temperature set value, control the second solenoid valve to open and control the third, fourth and fifth solenoid valves to close to end the defrosting process.

[0091] This invention provides a processor for running a program, wherein the program executes the defrosting control method.

[0092] Specifically, defrosting control methods include:

[0093] Step S201: Upon receiving a defrost signal from the heat recovery air conditioner, control the second solenoid valve to close and control the third, fourth and fifth solenoid valves to open to defrost the outdoor heat exchanger.

[0094] Step S202: Monitor the first temperature of the outdoor heat exchanger in real time. If the first temperature is greater than the first temperature set value, control the second solenoid valve to open and control the third, fourth and fifth solenoid valves to close to end the defrosting process.

[0095] This invention provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0096] Step S201: Upon receiving a defrost signal from the heat recovery air conditioner, control the second solenoid valve to close and control the third, fourth and fifth solenoid valves to open to defrost the outdoor heat exchanger.

[0097] Step S202: Monitor the first temperature of the outdoor heat exchanger in real time. If the first temperature is greater than the first temperature set value, control the second solenoid valve to open and control the third, fourth and fifth solenoid valves to close to end the defrosting process.

[0098] The devices mentioned in this article can be servers, PCs, tablets, mobile phones, etc.

[0099] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0100] Step S201: Upon receiving a defrost signal from the heat recovery air conditioner, control the second solenoid valve to close and control the third, fourth and fifth solenoid valves to open to defrost the outdoor heat exchanger.

[0101] Step S202: Monitor the first temperature of the outdoor heat exchanger in real time. If the first temperature is greater than the first temperature set value, control the second solenoid valve to open and control the third, fourth and fifth solenoid valves to close to end the defrosting process.

[0102] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0103] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0104] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0105] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0106] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0107] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0108] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0109] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0110] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0111] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A constant-temperature defrosting system for a heat recovery air conditioner, characterized in that, The system includes: Compressor, first solenoid valve, water tank, first expansion valve, first check valve, second solenoid valve, outdoor heat exchanger, four-way valve, third solenoid valve, energy storage tank, fourth solenoid valve, fifth solenoid valve, second check valve; The first heating circuit is formed by sequentially connecting the compressor, the first solenoid valve, the water tank, the first expansion valve, the first check valve, the second solenoid valve, the outdoor heat exchanger, and the four-way valve. The first port of the four-way valve is connected to the outdoor heat exchanger, and the second port is connected to the compressor. The first defrosting circuit is formed by sequentially connecting the compressor, the first solenoid valve, the water tank, the first expansion valve, the first check valve, the third solenoid valve, the energy storage water tank, the fourth solenoid valve, and the four-way valve. The compressor, the fifth solenoid valve, the second one-way valve, the outdoor heat exchanger, and the four-way valve are connected in sequence to form the second defrosting circuit; A single-heating hot water defrosting circuit is composed of the first heating circuit, the first defrosting circuit, and the second defrosting circuit. The system also includes: Sixth solenoid valve, indoor heat exchanger, second expansion valve; The compressor, the sixth solenoid valve, the four-way valve, the indoor heat exchanger, the second expansion valve, the second solenoid valve, the outdoor heat exchanger, and the four-way valve are connected in sequence to form a second heating circuit. The third port of the four-way valve is connected to the sixth solenoid valve, and the fourth port is connected to the indoor heat exchanger. A single heating and defrosting circuit is composed of the second heating circuit, the first defrosting circuit, and the second defrosting circuit. The heating and hot water defrosting circuits are composed of the first heating circuit, the second heating circuit, the first defrosting circuit, and the second defrosting circuit.

2. The system according to claim 1, characterized in that, The water tank and the energy storage tank include heat exchangers.

3. A defrosting control method for a constant-temperature defrosting system of a heat recovery air conditioner as described in any one of claims 1 or 2, characterized in that, include: Upon receiving a defrost signal from the heat recovery air conditioner, the second solenoid valve is closed, and the third, fourth, and fifth solenoid valves are opened to defrost the outdoor heat exchanger. The system monitors the first temperature of the outdoor heat exchanger in real time. If the first temperature is greater than the first temperature set value, it controls the second solenoid valve to open and controls the third, fourth, and fifth solenoid valves to close to end the defrosting process.

4. The defrosting control method according to claim 3, characterized in that, In the process of real-time monitoring of the first temperature of the outdoor heat exchanger, the method further includes: The second temperature of the energy storage tank is monitored in real time. If the second temperature is lower than the second temperature set value, the energy storage tank is heated until the second temperature of the energy storage tank reaches the third temperature set value, wherein the third temperature set value is greater than the second temperature set value.

5. The defrosting control method according to claim 3, characterized in that, The method includes: Upon receiving a mode switching instruction, the system's operating mode is switched according to the instruction. The operating modes include: heating and hot water defrosting mode, heating-only defrosting mode, and hot water-only defrosting mode.

6. A defrosting control device for a constant-temperature defrosting system of a heat recovery air conditioner as described in any one of claims 1 or 2, characterized in that, include: The first control unit is used to control the second solenoid valve to close and the third, fourth and fifth solenoid valves to open to defrost the outdoor heat exchanger when a defrosting signal is received from the heat recovery air conditioner. The second control unit is used to monitor the first temperature of the outdoor heat exchanger in real time. When the first temperature is greater than the first temperature set value, it controls the second solenoid valve to open and controls the third, fourth and fifth solenoid valves to close to end the defrosting process.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the defrosting control method according to any one of claims 3 to 5.

8. An electronic device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing the defrosting control method according to any one of claims 3 to 5.

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