Constant-heating defrosting system of heat recovery air conditioner and defrosting control method and device

Abstract

The invention provides a constant-heating defrosting system of a heat recovery air conditioner and a defrosting control method and device. According to the system, a compressor, a first electromagnetic valve, a water tank, a first expansion valve, a first one-way valve, a second electromagnetic valve, an outdoor heat exchanger and a four-way valve are connected to form a first heating loop; a compressor, a first electromagnetic valve, a water tank, a first expansion valve, a first one-way valve, a third electromagnetic valve, an energy storage water tank, a fourth electromagnetic valve and a four-way valve are connected to form a first defrosting loop. A compressor, a fifth electromagnetic valve, a second one-way valve, an outdoor heat exchanger and a four-way valve are connected to form a second defrosting loop; and the first heating loop, the first defrosting loop and the second defrosting loop form a single heating water defrosting loop. The problem that in the prior art, in the defrosting process, the comfort experience of a user is affected due to the fact that an air conditioner does not conduct heating is solved.

Description

Technical Field

[0001] This application relates to the technical field of constant-temperature defrosting for heat recovery air conditioners. Specifically, it relates to a constant-temperature 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. Background Art

[0002] With the progress and development of technology, the market demand for air-cooled air-conditioning heat pump units with heat recovery is gradually increasing. When an air-cooled air-conditioning heat pump unit operates for heating in a low-temperature environment, as the outdoor ambient temperature is lower, the outdoor heat exchanger frosts more severely, and the heat exchange efficiency is lower. When the frost thickness reaches a certain level, defrosting control will be carried out for the performance reliability of the whole machine. Currently, the commonly used defrosting control method is to use a four-way valve to switch to the refrigeration mode to defrost the outdoor heat exchanger. During the defrosting process, since the air conditioner does not heat, it is easy to cause indoor temperature fluctuations. If the defrosting time is too long, it will also affect the comfort experience of users. Summary of the Invention

[0003] The main purpose of this application is to provide a constant-temperature 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, so as to at least solve the problem that in the prior art, during the defrosting process of the outdoor heat exchanger, the comfort experience of users is affected due to the non-heating of the air conditioner during defrosting.

[0004] To achieve the above object, 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 check valve, a second solenoid valve, an outdoor heat exchanger, a four-way valve, a third solenoid valve, an energy storage water tank, a fourth solenoid valve, a fifth solenoid valve, and a second check valve; wherein, a first heating circuit is formed by 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 in sequence. The first port of the four-way valve is connected to the outdoor heat exchanger, and the second port is connected to the compressor; a first defrosting circuit is formed by 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 in sequence; a second defrosting circuit is formed by connecting the compressor, the fifth solenoid valve, the second check valve, the outdoor heat exchanger, and the four-way valve in sequence; a single hot water defrosting circuit is formed by the first heating circuit, the first defrosting circuit, and the second defrosting circuit.

[0005] Optionally, the system further includes: a sixth solenoid valve, an indoor heat exchanger, and a second expansion valve; wherein, a second heating circuit is formed by connecting 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 in sequence, 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; a single heating defrosting circuit is formed by the second heating circuit, the first defrosting circuit, and the second defrosting circuit.

[0006] Optionally, a heating and hot water defrosting circuit is formed by 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 water tank include heat exchangers.

[0008] According to another aspect of the present application, there is provided a defrosting control method for a constant temperature defrosting system applied to any one of the above-mentioned heat recovery air conditioners, including: when receiving a defrosting signal of the heat recovery air conditioner, controlling the second solenoid valve to close, and controlling the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to open to perform defrosting treatment on the outdoor heat exchanger; real-time monitoring the first temperature of the outdoor heat exchanger, and when the first temperature is greater than the first temperature set value, controlling the second solenoid valve to open, and controlling the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to close to end the defrosting treatment.

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

[0010] Optionally, the method includes: when receiving a mode switching instruction, switching the working mode of the system according to the mode switching instruction, wherein the working modes include: heating and hot water defrosting mode, single heating defrosting mode, and single heating and hot water defrosting mode.

[0011] According to another aspect of the present application, there is provided a defrosting control device for a constant-temperature defrosting system applied to any one of the above-mentioned heat recovery air conditioners, including: a first control unit, configured to control the second solenoid valve to close and control the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve to open for defrosting the outdoor heat exchanger when receiving a defrosting signal of the heat recovery air conditioner; a second control unit, configured to monitor the first temperature of the outdoor heat exchanger in real time, and control the second solenoid valve to open and control the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve to close to end the defrosting process when the first temperature is greater than the first temperature set value.

[0012] According to still another aspect of the present application, there is provided a computer-readable storage medium, which includes a stored program, wherein when the program runs, it controls the device where the computer-readable storage medium is located to execute any one of the above-mentioned defrosting control methods.

[0013] According to yet another aspect of the present application, there is provided an electronic device, including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include those for executing any one of the above-mentioned defrosting control methods.

[0014] Applying the technical solution of the present application, the system 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 water tank, a fourth solenoid valve, a fifth solenoid valve, and a second check valve; wherein, a first heating circuit is formed by 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 in sequence, the first port of the four-way valve is connected to the outdoor heat exchanger, and the second port is connected to the compressor; a first defrosting circuit is formed by 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 in sequence; a second defrosting circuit is formed by connecting the compressor, the fifth solenoid valve, the second check valve, the outdoor heat exchanger, and the four-way valve in sequence; and a single-heating hot water defrosting circuit is formed by the first heating circuit, the first defrosting circuit, and the second defrosting circuit. Through the combination of the first heating circuit, the first defrosting circuit, and the second defrosting circuit, not only the defrosting efficiency of the outdoor heat exchanger is improved, but also the stability of indoor heating and hot water supply is ensured through the heat energy storage and release of the energy storage water tank; by changing the flow direction of the refrigerant and using the heat of the high-temperature refrigerant to defrost the outdoor heat exchanger at the same time, defrosting can be achieved while the air conditioner continuously heats, so that the indoor temperature remains stable, the heat exchange efficiency of the air conditioner is ensured, and the problem that in the prior art, during the defrosting process of the outdoor heat exchanger, the comfort experience of users is affected due to the non-heating of the air conditioner during defrosting is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not unduly limit this application. In the drawings:

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

[0017] Figure 2 shows a schematic flowchart of a defrosting control method provided according to an embodiment of this application;

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

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

[0020] Among them, the above-mentioned drawings 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 water tank; 14, fourth solenoid valve; 15, fifth solenoid valve; 16, second check valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0023] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0024] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of this application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] As introduced in the background art, during the defrosting process of the outdoor heat exchanger in the prior art, since the air conditioner does not generate heat during defrosting, it affects the comfort experience of users. To solve the problem that in the prior art, during the defrosting process of the outdoor heat exchanger, the fact that the air conditioner does not generate heat during defrosting affects the comfort experience of users, the embodiments of this application provide a constant-temperature defrosting system, a defrosting control method, a defrosting control device, a computer-readable storage medium and an electronic device for a heat recovery air conditioner.

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] Figure 1 is a structural diagram of a constant-temperature defrosting system for a heat recovery air conditioner according to an embodiment of this application, as Figure 1 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 solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve control the flow direction of the refrigerant to achieve the switching of the system between the heating and defrosting modes; the water tank and the energy storage water tank are used to store hot water, where the water tank is directly connected to the heating circuit for daily hot water supply; the energy storage water tank plays a role in storing heat energy during the defrosting process to ensure the hot water supply during defrosting.

[0030] Among them, a first heating circuit is formed by sequentially connecting the above-mentioned compressor 1, the above-mentioned first solenoid valve 2, the above-mentioned water tank 3, the above-mentioned first expansion valve 4, the above-mentioned first check valve 5, the above-mentioned second solenoid valve 6, the above-mentioned outdoor heat exchanger 7, and the above-mentioned 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] A first defrosting circuit is formed by sequentially connecting the above-mentioned compressor 1, the above-mentioned first solenoid valve 2, the above-mentioned water tank 3, the above-mentioned first expansion valve 4, the above-mentioned first check valve 5, the above-mentioned third solenoid valve 12, the above-mentioned energy storage water tank 13, the above-mentioned fourth solenoid valve 14, and the above-mentioned four-way valve 8;

[0032] A second defrosting circuit is formed by sequentially connecting the above-mentioned compressor 1, the above-mentioned fifth solenoid valve 15, the above-mentioned second check valve 16, the above-mentioned outdoor heat exchanger 7, and the above-mentioned four-way valve 8;

[0033] The single-heating hot water defrosting circuit is composed of the above-mentioned first heating circuit, the above-mentioned first defrosting circuit, and the above-mentioned second defrosting circuit.

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

[0035] Specifically, when the air conditioner performs heating and defrosting, the flow direction of the refrigerant is adjusted so that the throttled refrigerant flows to the energy storage water tank for evaporation heat exchange and then returns to the compressor. At the same time, it is controlled that the high-temperature refrigerant discharged from the compressor flows into the outdoor heat exchanger through the bypass pipeline to defrost the outdoor heat exchanger.

[0036] In this embodiment, through the combination of the first heating circuit, the first defrosting circuit, and the second defrosting circuit, not only the defrosting efficiency of the outdoor heat exchanger is improved, but also the stability of indoor heating and hot water supply is ensured through the heat energy storage and release of the energy storage water tank; by changing the flow direction of the refrigerant and using 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, ensuring the heat exchange efficiency of the air conditioner, and solving the problem in the prior art that the comfort experience of users is affected due to the fact that the air conditioner does not heat during defrosting of the outdoor heat exchanger.

[0037] As an optional embodiment, such as Figure 1As shown in the figure, the above system further includes: a sixth solenoid valve 9, an indoor heat exchanger 10, and a second expansion valve 11. Among them, a second heating circuit is formed by connecting the above compressor 1, the above sixth solenoid valve 9, the above four-way valve 8, the above indoor heat exchanger 10, the above second expansion valve 11, the above second solenoid valve 6, the above outdoor heat exchanger 7, and the above four-way valve 8 in sequence. Among them, the third port 83 of the above four-way valve 8 is connected to the above sixth solenoid valve 9, and the fourth port 84 is connected to the above indoor heat exchanger 10. A single heating defrosting circuit is formed by the above second heating circuit, the above first defrosting circuit, and the above second 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), the compressor, the second expansion valve 11, the four-way valve, the sixth solenoid valve, and the second solenoid valve through the refrigerant pipeline.

[0039] By adding an indoor heat exchanger, a second expansion valve, and the control of the sixth solenoid valve, the system can more effectively transfer heat to the indoor in the heating mode, improving the efficiency and comfort of indoor heating. As the main component of heat exchange, the indoor heat exchanger can cooperate with the second expansion valve to adjust the heat entering the indoor and ensure the stability of the indoor temperature.

[0040] As an optional embodiment, a heating and hot water defrosting circuit is formed by the above first heating circuit, the above second heating circuit, the above first defrosting circuit, and the above second defrosting circuit.

[0041] Specifically, the working principle of the heating and hot water defrosting circuit is that both the indoor heat exchanger and the water tank act as condensers and form a heating cycle system with the outdoor heat exchanger (evaporator), the compressor, the first expansion valve and the second expansion valve, the four-way valve, the sixth solenoid valve, the first solenoid valve and the second solenoid valve, and the first check valve 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 circuit realizes the versatility and high efficiency of the system, not only solving the problems of heating and hot water supply during defrosting of the heat recovery air conditioner in a low-temperature environment, but also improving the defrosting efficiency and the overall energy utilization efficiency of the system by optimizing the refrigerant circulation path.

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

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

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

[0046] Step S201, when receiving a defrosting signal of 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 perform defrosting treatment on the outdoor heat exchanger 7;

[0047] Specifically, when the air conditioner enters the defrosting stage, the second solenoid valve closes, and the third solenoid valve and the fourth solenoid valve are opened, so that the refrigerant throttled by the electronic expansion valve flows into the energy storage water tank. The outdoor heat exchanger no longer exchanges heat. At this time, the energy storage water tank is equivalent to the second evaporator. After the refrigerant evaporates and exchanges heat in the energy storage water tank, it flows back to the compressor through the four-way valve for the next heating cycle, enabling the air conditioner to continuously heat. At the same time, the fifth solenoid valve is opened, and the high-temperature refrigerant after compression is discharged from the compressor and flows into the outdoor heat exchanger through the bypass pipeline, using the heat of the high-temperature refrigerant to defrost the outdoor heat exchanger. The refrigerant coming out of the outdoor heat exchanger and the refrigerant coming out of the energy storage water tank converge and return to the compressor together.

[0048] Step S202, real-time monitor the first temperature of the above-mentioned outdoor heat exchanger 7. When the above-mentioned first temperature is greater than the first temperature set value, control the above-mentioned second solenoid valve 6 to open, and control the above-mentioned third solenoid valve 12, the above-mentioned fourth solenoid valve 14, and the above-mentioned fifth solenoid valve 15 to close to end the defrosting treatment.

[0049] Among them, the first temperature set value can be set according to the defrosting requirements of the specific outdoor heat exchanger. In addition, the defrosting can also be monitored according to the set time. When the defrosting set time is reached, it is determined that the defrosting is completed, and the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve are controlled to close, and the second solenoid valve is opened.

[0050] Specifically, when the defrosting of the outdoor heat exchanger is completed, control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to close, and open the second solenoid valve, so that the outdoor heat exchanger participates in heat exchange again, the energy storage water tank no longer participates in heat exchange, exits the defrosting control, and the air conditioner enters the normal heating mode.

[0051] In this embodiment, by applying the above steps S201 and S202, through dynamically adjusting the states 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. When receiving a defrosting signal, by closing the second solenoid valve and opening the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve, the system can preferentially use the heat generated by the compressor for defrosting the outdoor heat exchanger, improving the defrosting efficiency. At the same time, by real-time monitoring the temperature of the outdoor heat exchanger, when the temperature reaches the set value, the system can automatically end the defrosting process and resume normal heating and hot water supply, avoiding energy waste caused by excessive defrosting. This control method not only solves the problems of efficiency and stability during defrosting of the heat recovery air conditioner in low-temperature environments, but also improves the automation level and user comfort of the system through flexible control of the solenoid valves. It solves the problem in the prior art that during the defrosting process of the outdoor heat exchanger, the comfort experience of users is affected due to the non-heating of the air conditioner during defrosting.

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

[0053] Among them, the second temperature set value can be set according to the specific heating requirements of the energy storage water tank. For example, it can be set to 7°C, 10°C, 15°C, and the third temperature set value can be set to 35°C. And the water in the energy storage water tank can be consumed as domestic water, and the water temperature similar to the human body temperature can be selected. When the water temperature reaches the programmed 35°C, the heating can be stopped.

[0054] Specifically, since the water in the energy storage water tank is introduced from the water supply pipe, in a low-temperature environment, the water temperature is relatively low. Coupled with the fact that when the energy storage water tank participates in heat exchange as an evaporator and absorbs heat during evaporation, it will cause the temperature of the energy storage water tank to be even lower or even freeze, thus affecting the heat exchange efficiency of the energy storage water tank. Therefore, the temperature of the energy storage water tank needs to be above the second temperature set value. When the temperature of the energy storage water tank is lower than the second temperature set value, the hot water in the introduced water tank (including the heat exchanger) can be used to heat the energy storage water tank to raise the water temperature. The water in the energy storage water tank can be consumed as domestic water.

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

[0056] Specifically, the above method includes: when receiving a mode switching instruction, switching the operating mode of the above system according to the above mode switching instruction, where the above operating mode includes: heating and hot water defrosting mode, single heating defrosting mode, and single hot water defrosting mode.

[0057] Among them, the circuit corresponding to the heating and hot water defrosting mode is the heating and hot water defrosting circuit; the circuit corresponding to the single heating defrosting mode is the single heating defrosting circuit; 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 according to the corresponding switching instruction. By receiving the mode switching instruction, flexible switching of the system between different operating modes is achieved. This mode switching mechanism not only improves the adaptability and flexibility of the system, but also improves the overall efficiency and energy utilization efficiency of the system by optimizing the solenoid valve control logic in each mode, solving the mode switching problem during defrosting of the heat recovery air conditioner in low-temperature environments.

[0059] In addition, this embodiment also includes an intelligent frost layer monitoring and prediction mechanism. Advanced frost layer monitoring sensors are installed on the outdoor heat exchanger to detect the frost layer thickness on the surface of the heat exchanger in real time. At the same time, machine learning algorithms are used to predict the formation speed and thickness of the frost layer based on historical data (such as outdoor temperature, humidity, operating mode, etc.), so as to intelligently adjust the start time and frequency of defrosting. For example, when it is predicted that the frost layer is about to reach the critical thickness affecting the heat exchange efficiency, the system can start the defrosting program in advance to avoid over-defrosting or insufficient 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 at the same time. Intelligent prediction of frost layer formation can reduce the impact of defrosting on indoor temperature and further improve user comfort.

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

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

[0063] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the defrosting control method of the present application will be described in detail below in combination with specific embodiments.

[0064] This embodiment relates to a specific defrosting control method. The heat recovery air conditioner of this embodiment mainly includes a compressor 1, a four-way valve 8, a plurality of 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), a plurality of solenoid valves, a plurality of check valves, and refrigerant connection pipelines. As Figure 1 and Figure 3 shown, the specific contents are as follows:

[0065] Among them, the energy storage water tank 13 (including a heat exchanger) is arranged in parallel with the outdoor heat exchanger 7; a bypass pipeline is added between the exhaust port of the compressor 1 and the inlet end of the outdoor heat exchanger 7. A solenoid valve is provided on this pipeline to control the refrigerant flow rate. When the solenoid valve is open, the refrigerant flow rate passes through, and when the solenoid valve is closed, the refrigerant flow rate does not pass through. At the same time, a check valve is provided to control the refrigerant flow direction. When the air conditioner is in heating defrosting, the refrigerant flow direction is adjusted so that the throttled refrigerant flows to the energy storage water tank 13 for evaporation heat exchange and then returns to the compressor 1. At the same time, the high-temperature refrigerant discharged from the compressor 1 is controlled to flow into the outdoor heat exchanger 7 through the bypass pipeline to defrost the outdoor heat exchanger 7. During the entire defrosting process, it is not necessary to reverse the four-way valve 8 to achieve constant-temperature defrosting of the air conditioner.

[0066] The heating operation modes of the heat recovery air conditioner can be divided into three types: heating and hot water mode, single heating mode, and single hot water mode.

[0067] Among them, the working principle of the heating and hot water modes is that the indoor heat exchanger 10 and the water tank 3 both act as condensers, and form a heating cycle system with the outdoor heat exchanger 7 (evaporator), the compressor 1, the first expansion valve 4, the second expansion valve 11, the four-way valve 8, the sixth solenoid valve 9, the first solenoid valve 2, the second solenoid valve 6, and the first check valve 5 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, and the indoor heat exchanger 10 acts as a condenser to form a heating cycle system with the outdoor heat exchanger 7 (evaporator), the compressor 1, the second expansion valve 11, the four-way valve 8, the sixth solenoid valve 9, and the second solenoid valve 6 through the refrigerant pipeline.

[0069] For the single hot water mode, the indoor heat exchanger 10 does not participate in heat exchange, and the water tank 3 acts as a condenser to form a heating cycle system with the outdoor heat exchanger 7 (evaporator), the compressor 1, the first expansion valve 4, the four-way valve 8, the first solenoid valve 2, the second solenoid valve 6, and the first check valve 5 through the refrigerant pipeline. These three heating operation modes can operate independently or switch to each other according to requirements.

[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, the third solenoid valve 12 and the fourth solenoid valve 14 are opened, so that the refrigerant throttled by the electronic expansion valve flows into the energy storage water tank 13, and the outdoor heat exchanger 7 no longer exchanges heat. At this time, the energy storage water tank 13 is equivalent to the second evaporator. After the refrigerant evaporates and exchanges heat in the energy storage water tank 13, it flows back to the compressor 1 through the four-way valve 8 for the next heating cycle, enabling the air conditioner to continuously heat. At the same time, the fifth solenoid valve 15 is opened, and the high-temperature refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 7 through the bypass pipeline, using the heat of the high-temperature refrigerant 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 water tank 13 converge and return to the compressor 1 together. When the defrosting of the outdoor heat exchanger 7 is completed, the fifth solenoid valve 15, the third solenoid valve 12, and the fourth solenoid valve 14 are controlled to be closed, and the second solenoid valve 6 is opened, so that the outdoor heat exchanger 7 participates in heat exchange again, the energy storage water tank 13 no longer participates in heat exchange, exits the defrosting control, and the air conditioner enters the normal heating mode.

[0072] Since the water in the energy storage water tank 13 is introduced from the tap water pipe, the water temperature is relatively low in a low-temperature environment. Additionally, when the energy storage water tank 13 participates in heat exchange as an evaporator and evaporation absorbs heat, it will cause the temperature of the energy storage water tank 13 to be even lower or even freeze, thus affecting the heat exchange efficiency of the energy storage water tank 13. Therefore, the temperature of the energy storage water tank 13 needs to be above the preset temperature T (for example, the preset temperature T can be set to 7 °C). When the temperature of the energy storage water tank 13 is lower than the preset temperature T, hot water in the water tank 3 (including the heat exchanger) can be introduced to heat the energy storage water tank 13 to raise the water temperature. The water in the energy storage water tank 13 can be consumed as domestic water.

[0073] In this embodiment, by changing the flow direction of the refrigerant and simultaneously using the heat of the high-temperature refrigerant to defrost the outdoor heat exchanger 7, continuous heating of the air conditioner can be achieved without delaying defrosting, maintaining a stable indoor temperature, ensuring the heat exchange efficiency of the air conditioner, and improving the comfort experience of users.

[0074] The embodiment of the present application also provides a defrosting control device. It should be noted that the defrosting control device of the embodiment of the present application can be used to execute the defrosting control method provided by the embodiment of the present application. This device is used to implement the above-mentioned embodiment and the preferred implementation manner, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the device described in the following embodiments is preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0075] The following introduces the defrosting control device provided by the embodiment of the present application.

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

[0077] The first control unit 41 is used to control the second solenoid valve to close and control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to open to perform defrosting treatment on the outdoor heat exchanger when receiving a defrosting signal of the heat recovery air conditioner;

[0078] The second control unit 42 is used to monitor the first temperature of the above-mentioned outdoor heat exchanger in real time, and control the above-mentioned second solenoid valve to open and control the above-mentioned third solenoid valve, the above-mentioned fourth solenoid valve, and the above-mentioned fifth solenoid valve to close to end the defrosting treatment when the above-mentioned first temperature is greater than the first temperature set value.

[0079] In this embodiment, the first control unit is configured to control the second solenoid valve to close and control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to open for defrosting the outdoor heat exchanger when receiving the defrosting signal of the heat recovery air conditioner; the second control unit is configured to monitor the first temperature of the outdoor heat exchanger in real time, and control the second solenoid valve to open and control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to close to end the defrosting process when the first temperature is greater than the first temperature set value. By dynamically adjusting the state of the solenoid valve, efficient defrosting of the outdoor heat exchanger is achieved, while ensuring the continuity and stability of indoor heating and hot water supply. When receiving the defrosting signal, by closing the second solenoid valve and opening the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve, the system can preferentially use the heat generated by the compressor for defrosting the outdoor heat exchanger, improving the defrosting efficiency. At the same time, by monitoring the temperature of the outdoor heat exchanger in real time, when the temperature reaches the set value, the defrosting process can be automatically ended, and normal heating and hot water supply can be restored, avoiding energy waste caused by excessive defrosting. It not only solves the problems of efficiency and stability during defrosting of the heat recovery air conditioner in low-temperature environments, but also improves the automation level and user comfort of the system through flexible control of the solenoid valve. It solves the problem in the prior art that the comfort experience of users is affected due to the non-heating of the air conditioner during defrosting of the outdoor heat exchanger.

[0080] As an alternative solution, the device further includes a monitoring unit configured to monitor the second temperature of the energy storage water tank in real time during the process of monitoring the first temperature of the outdoor heat exchanger in real time, and heat the energy storage water tank until the second temperature of the energy storage water tank reaches the third temperature set value when the second temperature is lower than the second temperature set value, where the third temperature set value is greater than the second temperature set value.

[0081] Specifically, this not only ensures the hot water supply during defrosting, but also improves the defrosting efficiency and energy utilization efficiency of the system by preheating the energy storage water tank in advance. This design solves the problem of insufficient heat energy in the energy storage water tank during defrosting of the heat recovery air conditioner in low-temperature environments. By monitoring the temperature of the energy storage water 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 the heat recovery air conditioner in low-temperature environments.

[0082] An alternative solution, the device further includes a switching unit configured to switch the working mode of the system according to the mode switching instruction when receiving the mode switching instruction, where the working mode includes: heating and hot water defrosting mode, single heating defrosting mode, and single hot water defrosting mode.

[0083] Specifically, it is adjusted to the corresponding defrosting circuit according to the corresponding switching instruction. By receiving the mode switching instruction, the flexible switching of the system between different working modes is realized. This mode switching mechanism not only improves the adaptability and flexibility of the system, but also improves the overall efficiency and energy utilization efficiency of the system by optimizing the solenoid valve control logic in each mode, and solves the problem of mode switching during defrosting of the heat recovery air conditioner in a low-temperature environment.

[0084] The above-mentioned defrosting control device includes a processor and a memory. The above-mentioned first control unit, second control unit, etc. are all stored in the memory as program units, and the corresponding functions are realized by the processor executing the above-mentioned program units stored in the memory. The above-mentioned modules are all located in the same processor; or, the above-mentioned each module is located in different processors in any combination form.

[0085] The processor contains a kernel, and the kernel retrieves the corresponding program units from the memory. One or more kernels can be set, and by adjusting the kernel parameters, the problem that in the prior art, during the defrosting process of the outdoor heat exchanger, the discomfort experience of users is affected due to the non-heating of the air conditioner during defrosting is solved.

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

[0087] An embodiment of the present invention provides a computer-readable storage medium. The above-mentioned computer-readable storage medium includes a stored program, wherein when the above-mentioned program runs, it controls the device where the above-mentioned computer-readable storage medium is located to execute the above-mentioned defrosting control method.

[0088] Specifically, the defrosting control method includes:

[0089] Step S201, when receiving the defrosting signal of the heat recovery air conditioner, control the second solenoid valve to close, and control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to open to perform defrosting treatment on the outdoor heat exchanger;

[0090] Step S202, monitor the first temperature of the above-mentioned outdoor heat exchanger in real time. When the above-mentioned first temperature is greater than the first temperature set value, control the above-mentioned second solenoid valve to open, and control the above-mentioned third solenoid valve, the above-mentioned fourth solenoid valve, and the above-mentioned fifth solenoid valve to close to end the defrosting treatment.

[0091] An embodiment of the present invention provides a processor. The above-mentioned processor is used to run a program, wherein when the above-mentioned program runs, it executes the above-mentioned defrosting control method.

[0092] Specifically, the defrosting control method includes:

[0093] Step S201, when receiving the defrosting signal of the heat recovery air conditioner, control the second solenoid valve to close, and control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to open to perform defrosting treatment on the outdoor heat exchanger;

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

[0095] An embodiment of the present invention provides an electronic device. The device includes a processor, a memory, and a program stored on the memory and executable on the processor. When the processor executes the program, at least the following steps are implemented:

[0096] Step S201, when receiving the defrosting signal of the heat recovery air conditioner, control the second solenoid valve to close, and control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to open to perform defrosting treatment on the outdoor heat exchanger;

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

[0098] The device in this article can be a server, a PC, a PAD, a mobile phone, etc.

[0099] The present application also provides a computer program product, which is suitable for executing a program initialized with at least the following method steps when executed on a data processing device:

[0100] Step S201, when receiving the defrosting signal of the heat recovery air conditioner, control the second solenoid valve to close, and control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to open to perform defrosting treatment on the outdoor heat exchanger;

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

[0102] Obviously, those skilled in the art should understand that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed on a network composed of multiple computing devices. They can be implemented by program codes executable by the computing device. Thus, they can be stored in a storage device and executed by the computing device. And in some cases, the steps shown or described can be executed in a different order than here, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module for implementation. In this way, the present invention is not limited to any specific combination of hardware and software.

[0103] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0104] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0105] These computer program instructions can 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 generate a manufactured article including an instruction device, and the instruction device implements the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0106] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide for implementing the functions in the flowFigure 1 one or more processes and / or blocks Figure 1 steps of functions specified in one or more blocks

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

[0108] The memory may include non-permanent memory in the form of computer-readable media, 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 permanent and non-permanent, removable and non-removable media and can store information by any method or technology. The information can be computer-readable instructions, data structures, program modules, 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, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0110] It should also be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

[0111] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A constant-temperature defrosting system for a heat recovery air conditioner, characterized in that, The system 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 water tank, a fourth solenoid valve, a fifth solenoid valve, and a second check valve; wherein, a first heating circuit is formed by 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 in sequence, and a first port of the four-way valve is connected to the outdoor heat exchanger and a second port is connected to the compressor; a first defrosting circuit is formed by 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 in sequence; a second defrosting circuit is formed by connecting the compressor, the fifth solenoid valve, the second check valve, the outdoor heat exchanger, and the four-way valve in sequence; a single hot water defrosting circuit is formed by the first heating circuit, the first defrosting circuit, and the second defrosting circuit.

2. The system according to claim 1, wherein The system further includes: a sixth solenoid valve, an indoor heat exchanger, and a second expansion valve; wherein, a second heating circuit is formed by connecting 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 in sequence, and a third port of the four-way valve is connected to the sixth solenoid valve and a fourth port is connected to the indoor heat exchanger; a single heating defrosting circuit is formed by the second heating circuit, the first defrosting circuit, and the second defrosting circuit.

3. The system according to claim 2, wherein a heating and hot water defrosting circuit is formed by the first heating circuit, the second heating circuit, the first defrosting circuit, and the second defrosting circuit.

4. The system according to claim 1, wherein The water tank and the energy storage water tank include heat exchangers.

5. A defrosting control method for a constant-temperature defrosting system of the heat recovery air conditioner according to any one of claims 1 to 4, characterized in that, It includes: When receiving a defrosting signal of the heat recovery air conditioner, controlling the second solenoid valve to close, and controlling the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to open to perform defrosting treatment on the outdoor heat exchanger; Real-time monitoring the first temperature of the outdoor heat exchanger, and when the first temperature is greater than a first temperature set value, controlling the second solenoid valve to open, and controlling the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to close to end the defrosting treatment.

6. The defrosting control method according to claim 5, wherein, During the process of real-time monitoring the first temperature of the outdoor heat exchanger, the method further includes: Real-time monitoring the second temperature of the energy storage water tank, and when the second temperature is lower than a second temperature set value, performing heating treatment on the energy storage water tank until the second temperature of the energy storage water tank reaches a third temperature set value, wherein the third temperature set value is greater than the second temperature set value.

7. The defrosting control method according to claim 5, characterized in that, The method includes: When receiving a mode switching instruction, switching the working mode of the system according to the mode switching instruction, wherein the working modes include: heating and hot water defrosting mode, single heating defrosting mode, and single hot water defrosting mode.

8. A defrosting control device for a constant-temperature defrosting system of the heat recovery air conditioner according to any one of claims 1 to 4, characterized in that, It includes: The first control unit is configured to control the second solenoid valve to close and control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to open for defrosting the outdoor heat exchanger when receiving a defrosting signal of the heat recovery air conditioner. The second control unit is configured to monitor the first temperature of the outdoor heat exchanger in real time, and control the second solenoid valve to open and control the third solenoid valve, the fourth solenoid valve, and the fifth solenoid valve to close to end the defrosting process when the first temperature is greater than the first temperature set value.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein when the program runs, it controls the device where the computer-readable storage medium is located to execute the defrosting control method according to any one of claims 5 to 7.

10. An electronic device, characterized in that, 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, and the one or more programs include those for executing the defrosting control method according to any one of claims 5 to 7.

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