Air conditioner defrosting device, defrosting method and storage medium

Abstract

The embodiments of the present application disclose a defrosting device, a defrosting method, and a storage medium for an air conditioner, which are used in the technical field of air conditioning equipment, and include: a compressor, a heat exchanger, a plurality of first passage valves, a plurality of second passage valves, a control device, and a balancing tank; the control device is connected to the first passage valve and the second passage valve, respectively, and is used to control the air inlet and the first port of the first passage valve corresponding to the target air heat exchanger to be connected when there is a target air heat exchanger that needs to be defrosted, and to control the first port and the second port of the second passage valve corresponding to the target air heat exchanger to be connected, so that the liquid refrigerant condensed in the target air heat exchanger flows into the balancing tank and is introduced into the air inlet of the compressor through the balancing tank. In the embodiments of the present application, the liquid refrigerant generated by defrosting flows into the balancing tank and is introduced into the air inlet of the compressor through the balancing tank, which effectively improves the heat exchange effect of the target air heat exchanger and other air heat exchangers.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of air-conditioning equipment, and in particular to a defrosting device, a defrosting method, and a storage medium for an air conditioner. Background Art

[0002] Compared with traditional heating methods such as coal burning and electric heating, air source heat pump air conditioners have a higher performance coefficient, and have the advantages of both cooling and heating, energy saving and environmental protection.

[0003] In winter, when the outdoor temperature is very low, the outdoor unit of the air heat exchanger is prone to frost when the air conditioner is heating. Due to the frost problem of the outdoor unit, the actual heating effect of the air source heat pump in winter is affected. Especially in areas with high humidity in winter, ice is more likely to form on the bottom of the outdoor unit, thus affecting the heating effect of the air conditioner. Among the current air conditioner defrosting methods, there is a subsystem defrosting operation mode for the air conditioner outdoor unit. That is, in the air conditioner heating mode, the target air heat exchanger that needs to be defrosted is defrosted, while other air heat exchangers that do not need to be defrosted continue to operate in the heating mode. After defrosting is completed, the target air heat exchanger re-enters the heating operation mode.

[0004] However, during the defrosting process of the target air heat exchanger, the liquid refrigerant produced by condensation is likely to accumulate in the target air heat exchanger; at the same time, the liquid refrigerant produced by condensation is likely to flow into other air heat exchangers that are not defrosted, affecting the heat exchange effects of the target air heat exchanger and other air heat exchangers. Summary of the Invention

[0005] The embodiments of the present application provide a defrosting device, a defrosting method, and a storage medium for an air conditioner, which can effectively improve the heat exchange effect of a target air heat exchanger and other air heat exchangers.

[0006] The embodiment of the present application provides a defrosting device for an air conditioner, which is used to defrost an air heat exchanger, comprising: a compressor, a heat exchanger, a plurality of first passage valves, a plurality of second passage valves, a control device, and a balancing tank;

[0007] The exhaust port of the compressor is connected to the air inlet of each of the first passage valves, and the air inlet of the compressor is respectively connected to the exhaust port of each of the first passage valves and the first port of the balance tank;

[0008] The first port of each of the first passage valves is connected to the first port of a different air heat exchanger, and the second port of each of the first passage valves is connected to the first port of the heat exchanger;

[0009] The second port of the balancing tank is connected to the first port of each second passage valve, the second port of each second passage valve is respectively connected to the second port of a different air heat exchanger, and the third port of each second passage valve is connected to the second port of the heat exchanger;

[0010] The control device is connected to the first passage valve and the second passage valve respectively, and is used to control the air inlet and the first port of the first passage valve corresponding to the target air heat exchanger to be connected when there is a target air heat exchanger that needs to be defrosted, and to control the first port and the second port of the second passage valve corresponding to the target air heat exchanger to be connected, so that the liquid refrigerant condensed in the target air heat exchanger flows into the balancing tank and is introduced into the air inlet of the compressor through the balancing tank.

[0011] Furthermore, the first passage valve is a four-way valve, and the second passage valve includes a first valve and a second valve, wherein the second port of the air heat exchanger is connected to the first port of the corresponding first valve and the first port of the second valve respectively, the second port of each first valve is connected to the second port of the balancing tank, and the second port of each second valve is connected to the second port of the heat exchanger;

[0012] The control device is specifically used to control the air inlet and the first port of the four-way valve corresponding to the target air heat exchanger to be connected, and to control the first port and the second port of the first valve corresponding to the target air heat exchanger to be connected.

[0013] Furthermore, it also includes: a plurality of third valves and a fourth valve;

[0014] The second port of each of the four-way valves is connected to the first port of different third valves respectively; the first port of the heat exchanger is connected to the second port of each of the third valves;

[0015] The first port of the balancing tank is connected to the first port of the fourth valve, and the second port of the fourth valve is connected to the air inlet of the compressor.

[0016] Furthermore, the size of the balancing tank is determined according to the volume of a single heat exchanger module in the air heat exchanger, the maximum diameter of the fourth valve, and the liquid guiding speed.

[0017] Furthermore, the control device is connected to the third valve and the fourth valve respectively, and is also used to control the connection between the air inlet of each four-way valve and the first port and the connection between the second port and the exhaust port when the air conditioner operates in the cooling mode, control each first valve to be closed and each second valve to be opened, control each third valve to be opened and the fourth valve to be opened, and control the opening of the fourth valve according to the relative situation of the suction superheat of the compressor and the target temperature threshold.

[0018] Furthermore, the control device is connected to the third valve and the fourth valve respectively, and is also used to, when the air conditioner operates in heating mode, control the connection between the air intake port and the second port of each four-way valve and the connection between the first port and the exhaust port, control each first valve to be closed and each second valve to be opened, control each third valve to be opened and the fourth valve to be opened, and control the opening of the fourth valve according to the relative situation of the suction superheat of the compressor and the target temperature threshold.

[0019] Furthermore, the control device is connected to the air heat exchanger and is also used to control the target air heat exchanger to stop running when the target heat exchanger is defrosted, control the air inlet of the four-way valve corresponding to the target air heat exchanger to be connected to the first port and the second port to be connected to the exhaust port, control the second valve and the third valve corresponding to the target air heat exchanger to be closed, and control the first valve corresponding to the target air heat exchanger to be connected and control the fourth valve to be closed.

[0020] The present application also provides a defrosting method for an air conditioner, comprising:

[0021] Get the frost degree of multiple air heat exchangers in heating mode;

[0022] determining a target air heat exchanger that needs to be defrosted according to the frosting degree;

[0023] The target air heat exchanger is defrosted and other air heat exchangers are kept running in the heating mode.

[0024] The present application also provides a defrosting device for an air conditioner, comprising:

[0025] An acquisition unit, configured to acquire frost levels of multiple air heat exchangers in a heating mode;

[0026] a determining unit, configured to determine a target air heat exchanger that needs to be defrosted according to the frosting degree;

[0027] An execution unit is configured to defrost the target air heat exchanger and keep other air heat exchangers running in the heating mode.

[0028] The present application also provides a defrosting device for an air conditioner, comprising:

[0029] CPU, memory, input and output interfaces, wired or wireless network interfaces, power supply;

[0030] The memory is a transient storage memory or a persistent storage memory;

[0031] The central processing unit is configured to communicate with the memory and execute instructions in the memory on the control plane functional entity to perform the above-mentioned defrosting method.

[0032] An embodiment of the present application further provides a computer-readable storage medium, which includes instructions. When the instructions are executed on a computer, the computer executes the above-mentioned defrosting method.

[0033] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0034] The defrost device of the air conditioner provided in the embodiment of the present application includes: a compressor, a heat exchanger, a plurality of first passage valves, a plurality of second passage valves, a control device and a balancing tank; the control device is connected to the first passage valve and the second passage valve respectively, and is used to control the air inlet and the first port of the first passage valve corresponding to the target air heat exchanger to be connected when there is a target air heat exchanger that needs to be defrosted, and to control the first port and the second port of the second passage valve corresponding to the target air heat exchanger to be connected, so that the liquid refrigerant condensed in the target air heat exchanger flows into the balancing tank and is introduced into the air inlet of the compressor through the balancing tank. In the embodiment of the present application, the liquid refrigerant generated by defrosting flows into the balancing tank and is introduced into the air inlet of the compressor through the balancing tank, which effectively reduces the liquid refrigerant accumulated in the target air heat exchanger; and the liquid refrigerant generated during the defrosting process does not directly enter other air heat exchangers that are not defrosted, which effectively improves the heat exchange effect of the target air heat exchanger and other air heat exchangers. By rationally designing the volume of the balancing tank, the balancing tank can hold enough refrigerant liquid to reduce the risk of liquid backflow from the compressor when exiting defrost. At the same time, the refrigerant liquid contained in the balancing tank can also return to the system in a shorter time, avoiding lack of refrigerant during system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0036] Figure 1 A schematic diagram of an air conditioning system disclosed in an embodiment of the present application;

[0037] Figure 2 This is a schematic diagram of another air conditioning system disclosed in an embodiment of the present application;

[0038] Figure 3 This is a flow chart of air conditioner defrosting disclosed in an embodiment of the present application;

[0039] Figure 4 A diagram of a defrosting device for an air conditioner disclosed in an embodiment of the present application;

[0040] Figure 5 This is a diagram of another air conditioner defrosting device disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0042] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present application.

[0043] In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present application based on the specific circumstances.

[0044] Among the current air conditioner defrosting methods, there is a subsystem defrosting operation mode for the air conditioner outdoor unit, that is, in the air conditioner heating mode, the target air heat exchanger that needs to be defrosted is defrosted, while other air heat exchangers that do not need to be defrosted continue to operate in the heating mode. After the defrosting is completed, the target air heat exchanger re-enters the heating operation mode. However, during the defrosting process of the target air heat exchanger, the liquid refrigerant produced by condensation is likely to accumulate in the target air heat exchanger; at the same time, the liquid refrigerant produced by condensation is likely to flow into other air heat exchangers that have not been defrosted, affecting the heat exchange effect of the target air heat exchanger and other air heat exchangers. Therefore, an embodiment of the present application provides a defrosting device for an air conditioner, which can effectively improve the heat exchange effect of the target air heat exchanger and other air heat exchangers, specifically as follows. Figure 1 and Figure 2 As shown:

[0045] The present application embodiment provides a defrosting device for an air conditioner, which is used to defrost an air heat exchanger, and includes: a compressor 1, a heat exchanger 6, a first passage valve assembly 2, a second passage valve assembly (4 and 5), a control device, and a balance tank 8; the first passage valve assembly 2 includes a plurality of first passage valves (first passage valve components), which can be a four-way valve, a six-way valve, or a plurality of valves, which are not specifically limited here. The second passage valve assembly (4 and 5) includes a plurality of second passage valves, which can be a three-way valve, a four-way valve, or a plurality of valves, which are not specifically limited here. It is understood that the defrosting device and the air heat exchanger assembly 3 can be combined to form a heat pump air conditioning unit, and the compressor 1 (compressor assembly) includes no less than one compressor component, and the compressor 1 is any one of a rotary compressor, a scroll compressor, a screw compressor, a centrifugal compressor, or a magnetic levitation compressor, which are not specifically limited here; the compressor 1 can be a fixed frequency compressor or a variable frequency compressor, which are not specifically limited here. It is understandable that the embodiment of the present application is mainly aimed at defrosting a certain air heat exchanger in the air heat exchanger assembly 3. The air heat exchanger assembly 3 includes no less than two air heat exchangers (air heat exchanger modules), each of which includes at least one air heat exchanger body and at least one fan. The air heat exchanger body can be a copper tube aluminum fin heat exchanger or a microchannel heat exchanger, which is not specifically limited here; the fan can be a fixed frequency fan or a variable frequency fan, which is not specifically limited here. The heat exchanger 6 is a cold / hot water heat exchanger, which can be a fluorine-water heat exchanger or a fluorine-air heat exchanger, which is not specifically limited here. The balance tank 8 is any one of a tank-type or cylindrical container, which is not specifically limited here.

[0046] Specifically, the exhaust port of the compressor 1 is connected to the air inlet D port of each first passage valve 2, and the air inlet of the compressor 1 is respectively connected to the exhaust port S port of each first passage valve 2 and the first port M port of the balance tank 8; it can be understood that the exhaust port and the air inlet are also called ports, and the connection between the ports is mainly through pipelines. The first port C port of each first passage valve 2 is respectively connected to the first port F port of a different air heat exchanger 3, and the second port E port of each first passage valve 2 is connected to the first port L port of the heat exchanger 6; the second port N port of the balance tank 8 is connected to the first port (B port of 4) of each second passage valve (4 and 5); the second port (A port of 4 and 5) of each second passage valve (4 and 5) is respectively connected to the second port P port of a different air heat exchanger 3, and the third port (B port of 5) of each second passage valve (4 and 5) is connected to the second port R port of the heat exchanger 6 The control device is connected to the first passage valve 2 and the second passage valve (4 and 5) respectively, and is used to control the air inlet D and the first port C of the first passage valve 2 corresponding to the target air heat exchanger to be connected when there is a target air heat exchanger that needs to be defrosted in the air heat exchanger assembly 3, and control the first port and the second port of the second passage valve (4 and 5) corresponding to the target air heat exchanger to be connected, that is, the A and B ports in 4 are connected; so that the liquid refrigerant condensed in the target air heat exchanger flows into the balancing tank 8 and is introduced into the air inlet of the compressor 1 through the balancing tank 8. The condensed liquid refrigerant is first introduced into the balancing tank 8, and then the refrigerant in the balancing tank 8 is slowly introduced into the air intake of the compressor 1.

[0047] The defrosting device of the air conditioner provided in the embodiment of the present application includes: a compressor 1, a heat exchanger 6, a plurality of first passage valves 2, a plurality of second passage valves (4 and 5), a control device and a balancing tank 8, wherein the control device is connected to the first passage valve 2 and the second passage valve (4 and 5), respectively, and is used to control the air inlet D port and the first port C port of the first passage valve 2 corresponding to the target air heat exchanger to be conductive when there is a target air heat exchanger that needs to be defrosted, and control the first port and the second port of the second passage valve (4 and 5) corresponding to the target air heat exchanger to be conductive, so that the liquid refrigerant condensed in the target air heat exchanger flows into the balancing tank 8 and is introduced into the air inlet of the compressor 1 through the balancing tank 8. In the embodiment of the present application, the liquid refrigerant generated by defrosting flows into the balancing tank 8 and is introduced into the air inlet of the compressor 1 through the balancing tank 8, effectively reducing the liquid refrigerant accumulated in the target air heat exchanger; and the liquid refrigerant generated during the defrosting process does not directly enter other air heat exchangers that are not defrosted, effectively improving the heat exchange effect of the target air heat exchanger and other air heat exchangers. Understandably, during the defrost process, there's no significant accumulation of liquid refrigerant within the target air heat exchanger, which enhances the heat transfer efficiency of the heat exchanger, shortens the defrost time, and improves defrost efficiency. Furthermore, the liquid refrigerant generated during the defrost process doesn't directly enter other air heat exchangers not undergoing defrost, negatively impacting their heat transfer. This helps prevent liquid backflow, which can result from deteriorating heat transfer efficiency within the air heat exchanger.

[0048] In one feasible solution, when the defrost device and the air heat exchanger assembly 3 form a new defrosting heat pump air conditioning unit, the air heat exchanger is divided into several air heat exchanger modules for sequential defrosting. During the defrosting process, there is no need to switch operating modes, significantly improving system stability. During the defrosting process, the user-side heat exchanger still outputs heat to the user, and the heat required for defrosting comes from other air heat exchanger modules that still serve as evaporators. The user-side water temperature fluctuates slightly, ensuring indoor thermal comfort. The unit does not involve switching between heating and cooling operating modes when entering / exiting defrosting, avoiding large fluctuations in system pressure and shock to compressor 1, thereby ensuring safe and stable system operation. The defrosting control is simple and reasonable, heat is supplied uninterruptedly during the defrosting process, and user-side temperature fluctuations are small. Through reasonable liquid conduction during the defrosting process, the heat transfer effect of the defrosting heat exchanger module is significantly improved, effectively shortening the defrosting time while reducing the risk of suction and liquid return to compressor 1 caused by defrosting.

[0049] Preferably, the first passage valve 2 is a four-way valve, and at least two four-way valves (four-way valve components) form a four-way valve assembly 2. The second passage valve (4 and 5) includes a first valve 4 and a second valve 5, that is, the second passage valve assembly includes a first valve assembly 4 and a second valve assembly 5. The first valve 4 can be any one of a solenoid valve, an electric ball valve or an electronic expansion valve, which is not specifically limited here; the second valve 5 can be any one of an electronic expansion valve, an electric ball valve, and a thermal expansion valve, which is not specifically limited here. Among them, the second port P of the air heat exchanger 3 is respectively connected to the first port A of the corresponding first valve 4 and the first port A of the second valve 5, the second port B of each first valve 4 is connected to the second port N of the balance tank 8, and the second port B of each second valve 5 is connected to the second port R of the heat exchanger 6; the control device is specifically used to control the air inlet D and the first port C of the four-way valve corresponding to the target air heat exchanger to be conductive, and to control the first port A and the second port B of the first valve 4 corresponding to the target air heat exchanger to be conductive.

[0050] Furthermore, the defrost device also includes a third valve assembly 7 and a fourth valve 9. The third valve assembly 7 includes multiple third valves, each of which can be a solenoid valve, an electric ball valve, or an electronic expansion valve, with no specific limitations here. The fourth valve 9 can be an electronic expansion valve, an electric ball valve, or a thermal expansion valve, with no specific limitations here. The second port E of each four-way valve is connected to the first port A of a different third valve 7; the first port L of the heat exchanger 6 is connected to the second port B of each third valve 7; the second port N of the balancing tank 8 is connected to the second port B of each first valve 4; the first port M of the balancing tank 8 is connected to the first port A of the fourth valve 9; and the second port B of the fourth valve 9 is connected to the air inlet of the compressor 1. In one conceivable embodiment, the number of components in the four-way valve assembly 2, the air heat exchanger assembly 3, the first valve assembly 4, the second valve assembly 5, and the third valve assembly 7 corresponds to one another. It will be understood that the balancing tank 8 has a preset volume for storing refrigerant liquid. Specifically, the preset volume can be 0.2 or 0.3 cubic meters, which is not limited here. Preferably, a balancing tank 8 of appropriate size needs to be selected based on the volume of a single heat exchanger module in the heat exchanger assembly 3, the diameter (opening) of the fourth valve 9, and the liquid guide speed. On the one hand, the volume of the balancing tank 8 needs to accommodate a sufficient amount of refrigerant liquid to improve defrost efficiency and reduce the risk of liquid return to the compressor 1 when exiting defrost; on the other hand, the refrigerant liquid contained in the balancing tank 8 needs to return to the system in a relatively short time to prevent refrigerant shortage during system operation.

[0051] Specifically, a new defrost heat pump air-conditioning unit includes: a compressor 1, a four-way valve assembly 2, an air heat exchanger assembly 3, a first valve assembly 4, a second valve assembly 5, a heat exchanger 6, a third valve assembly 7, a balancing tank 8 and a fourth valve 9; the exhaust port of the compressor 1 is connected to the D port of the four-way valve assembly 2, and the intake port of the compressor 1 is connected to the S port of the four-way valve assembly 2 and the B port of the fourth valve 9; the C port of the four-way valve assembly 2 is connected to the F port of the air heat exchanger assembly 3, and the E port of the four-way valve assembly 2 is connected to the A port of the third valve assembly 7; the B port of the third valve assembly 7 is connected to the L port of the heat exchanger 6; the P port of the air heat exchanger assembly 3 is connected to the A port of the first valve assembly 4 and the A port of the second valve assembly 5; the B port of the first valve assembly 4 is connected to the N port of the balancing tank 8; the M port of the balancing tank 8 is connected to the A port of the fourth valve 9; and the B port of the second valve assembly 5 is connected to the R port of the heat exchanger 6. Compressor 1, four-way valve assembly 2, air heat exchanger assembly 3, first valve assembly 4, second valve assembly 5, third valve assembly 7, balancing tank 8, and fourth valve 9 are connected via pipelines, collectively enabling the heat pump air conditioner to defrost air heat exchanger assembly 3 without switching between heating and cooling modes. By optimizing and rationally matching the air conditioner's key components, and ultimately implementing rational logical control over the entire unit, the air conditioner's stable operation is ensured, its overall performance is improved, the adverse effects of the defrost process on the system are mitigated, and user thermal comfort is guaranteed.

[0052] Furthermore, the control device is connected to the third valve 7 and the fourth valve 9, respectively, and is also used to control each four-way valve in the four-way valve assembly 2 to remain in a de-energized state when the air conditioner is operating in cooling mode, so that the air inlet port D of each four-way valve is connected to the first port C and the second port E is connected to the exhaust port S. At the same time, each first valve in the first valve assembly 4 is controlled to be closed and each second valve in the second valve assembly 5 is controlled to be controlled to be controlled (opened), and each third valve in the third valve assembly 7 is controlled to be controlled to be controlled and the fourth valve 9 is controlled to be controlled. In one feasible solution, the four-way valve assembly 2 includes three four-way valves, the air heat exchanger assembly 3 includes three air heat exchangers, each of which is a V-shaped copper tube aluminum fin heat exchanger, the first valve assembly 4 includes three solenoid valves, the second valve assembly 5 includes three electronic expansion valves, the heat exchanger 6 is a dry fluorine-water heat exchanger, the third solenoid valve assembly 7 includes three solenoid valves, the balancing tank 8 is a tank-type container, and the fourth valve 9 is an electronic expansion valve. In cooling mode, heat exchanger 6 provides cold water, and the load of compressor 1 is controlled by the cold water temperature of heat exchanger 6. The higher the cold water temperature, the higher the load. Port D and port C of the three four-way valves in four-way valve assembly 2 are connected, and port S and port E are connected. The three air heat exchanger modules in air heat exchanger assembly 3 all act as condensers to dissipate heat to the air. The three solenoid valves in the first valve assembly 4 are all closed, and the three electronic expansion valves in the second valve assembly 5 are all open and their openings are controlled by the suction superheat at the air inlet of compressor 1. Heat exchanger 6 can be a dry fluorine-water heat exchanger that provides cold water as an evaporator. The three solenoid valves in the third valve assembly 7 are all open, and the fourth valve 9 can be an electronic expansion valve that is open and its opening is controlled according to the relative situation of the suction superheat of compressor 1 and the target temperature threshold. The target temperature threshold (control target value) can be 3°C or 5°C, which is not limited to this specific value. Preferably, the target temperature threshold is 4°C. Specifically, when the intake superheat is less than the target temperature threshold of the fourth valve 9, the opening of the fourth valve 9 is controlled to decrease; when the intake superheat is greater than the target temperature threshold of the fourth valve 9, the opening of the fourth valve 9 is controlled to increase; when the intake superheat is equal to the target temperature threshold of the fourth valve 9, the opening of the fourth valve 9 is controlled to remain.

[0053] Corresponding refrigeration cycle of the air-conditioning unit: the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 1 enters the D port of the four-way valve in the four-way valve assembly 2, and then enters the air heat exchanger assembly 3 through the C port of the four-way valve and exchanges heat with the air inside it for condensation. The condensed normal-temperature and high-pressure liquid refrigerant is throttled by the electronic expansion valve of the second valve assembly 5 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then enters the heat exchanger 6 (dry fluorine-water heat exchanger) and exchanges heat with cold water inside it for evaporation. The evaporated low-temperature and low-pressure gaseous refrigerant passes through the solenoid valve of the third valve assembly 7, enters the E port of the four-way valve in the four-way valve assembly 2, and then passes through the S port of the four-way valve to finally reach the suction port of the compressor of the compressor assembly 1 and returns to the compressor 1, completing a complete refrigeration mode cycle. At the same time, the fourth valve 9 (electronic expansion valve) is opened and the opening is controlled by the suction superheat. When there is still refrigerant accumulated in the balancing tank 8, the refrigerant in the balancing tank 8 will leave the balancing tank 8 from the M port, be throttled by the fourth valve 9 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and merge with the gas refrigerant from the heat exchanger 6 and return to the suction port of the compressor 1, ensuring that refrigerant is not accumulated in the balancing tank 8 for a long time when it is not in the defrosting process.

[0054] Furthermore, the control device is respectively connected to the third valve 7 and the fourth valve 9, and is also used to, when the air conditioner operates in heating mode, control each four-way valve in the four-way valve assembly 2 to remain in an energized state, the air inlet D of each four-way valve is connected to the second port E, and the first port C is connected to the exhaust port S, control each first valve in the first valve assembly 4 to be closed and each second valve in the second valve assembly 5 to be connected, and control each third valve in the third valve assembly 7 to be connected and the fourth valve 9 to be connected. In the above-described feasible solution, in heating mode, heat exchanger 6 provides hot water, the load of compressor 1 is controlled by the hot water temperature, ports D and E of the three four-way valves in four-way valve assembly 2 are connected, and ports S and C are connected. All three air heat exchangers in air heat exchanger assembly 3 act as evaporators, absorbing heat from the air. The three solenoid valves of first valve assembly 4 are all closed, and the three electronic expansion valves of second valve assembly 5 are all open, with their openings controlled by the outlet superheat of the corresponding air heat exchanger module 3. Heat exchanger 6 (dry fluorine-water heat exchanger) acts as a condenser to provide hot water. The three solenoid valves of third valve assembly 7 are all open, and fourth valve 9 (electronic expansion valve) is open, and its opening is controlled based on the relative situation of the suction superheat of compressor 1 and the target temperature threshold. Preferably, the target temperature threshold is 4°C. Specifically, when the intake superheat is less than the target temperature threshold of the fourth valve 9, the opening of the fourth valve 9 is controlled to decrease; when the intake superheat is greater than the target temperature threshold of the fourth valve 9, the opening of the fourth valve 9 is controlled to increase; when the intake superheat is equal to the target temperature threshold of the fourth valve 9, the opening of the fourth valve 9 is controlled to remain.

[0055] Corresponding heating cycle of the air-conditioning unit: the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 1 enters the D port of the four-way valve of the four-way valve assembly 2, then passes through the E port of the four-way valve, flows through the solenoid valve of the third valve assembly 7, enters the heat exchanger 6 (dry fluorine-water heat exchanger) and exchanges heat with hot water and condenses inside it. The condensed normal-temperature and high-pressure liquid refrigerant is throttled by the electronic expansion valve of the second valve assembly 5 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then enters the air heat exchanger assembly 3 and exchanges heat with the air and evaporates inside it. The evaporated low-temperature and low-pressure gaseous refrigerant enters the C port of the four-way valve of the four-way valve assembly 2, and then passes through the S port of the four-way valve and finally reaches the suction port of the compressor 1 and returns to the compressor 1, completing a complete heating mode cycle. At the same time, the fourth valve 9 (electronic expansion valve) is opened and the opening is controlled by the suction superheat. When there is still refrigerant accumulated in the balancing tank 8, the refrigerant in the balancing tank 8 will leave the balancing tank 8 from the M port, be throttled by the fourth valve 9 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and merge with the gas refrigerant from the air heat exchanger assembly 3 and return to the suction port of the compressor 1, ensuring that refrigerant is not accumulated in the balancing tank 8 for a long time when it is not in the defrosting process.

[0056] Furthermore, the control device is connected to each air heat exchanger and is further configured to, when the air conditioner is operating in heating mode and a target air heat exchanger needs to be defrosted, control the four-way valve corresponding to the target air heat exchanger to switch from an energized state to a de-energized state, connect the corresponding air inlet port D to the first port C, and connect the second port E to the exhaust port S, control the second valve 5 and third valve 7 corresponding to the target air heat exchanger to close, and control the first valve 4 corresponding to the target air heat exchanger to open. When the target air heat exchanger is defrosted, the four-way valve corresponding to the target air heat exchanger in the four-way valve assembly 2 switches from a de-energized state to an energized state, connects the corresponding ports D and E, and connects ports C and S. Simultaneously, the second valve corresponding to the target air heat exchanger in the second valve assembly 5 opens, the third valve corresponding to the target air heat exchanger in the third valve assembly 7 opens, the first valve corresponding to the target air heat exchanger in the first valve assembly 4 closes, and the fourth valve 9 is controlled to close. When the target air heat exchanger exits defrost, the opening of fourth valve 9 is controlled based on the relative position of the suction superheat of compressor 1 and the target temperature threshold. Preferably, the target temperature threshold is 4°C. Specifically, when the suction superheat is less than the target temperature threshold of fourth valve 9, the opening of fourth valve 9 is controlled to decrease. When the suction superheat is greater than the target temperature threshold of fourth valve 9, the opening of fourth valve 9 is controlled to increase. When the suction superheat is equal to the target temperature threshold of fourth valve 9, the opening of fourth valve 9 is controlled to remain constant.

[0057] In the above-mentioned feasible solution, during operation in the heating mode, if the target air heat exchanger in the air heat exchanger assembly 3 meets the defrost conditions, the four-way valve in the four-way valve assembly 2 is switched to conduction between ports D and C, and between ports S and E, and the solenoid valve in the first valve assembly 4 is opened. When one air heat exchanger is already defrosting, and other air heat exchangers meet the defrost conditions, this air heat exchanger module is not allowed to enter defrost immediately. Other air heat exchanger modules are allowed to enter defrost only after the defrosting air heat exchanger module exits defrost. When the target air heat exchanger in the air heat exchanger assembly 3 completes defrosting and meets the exit defrost conditions, the four-way valve in the four-way valve assembly 2 is switched to conduction between ports D and E, and between ports S and C, and the solenoid valve in the first valve assembly 4 is closed, and the system returns to normal heating mode operation.

[0058] Corresponding defrost cycle of the air-conditioning unit: the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the compressor assembly 1 enters the D port of the four-way valve of the four-way valve assembly 2, and a part of the high-temperature and high-pressure gaseous refrigerant enters the target air heat exchanger 1 in the air heat exchanger assembly 3 through the C port of the four-way valve 1 in the four-way valve assembly 2, and condenses and releases heat inside it to melt the frost layer outside the target air heat exchanger 1. The condensed normal temperature and high-pressure liquid refrigerant passes through the solenoid valve 1 in the first valve assembly 4, enters the balancing tank 8 from the N port of the balancing tank 8 through the discharge pipeline, and then leaves the balancing tank 8 from the M port of the balancing tank 8 and is throttled by the fourth valve 9 to become a gas-liquid two-phase refrigerant and merges with the superheated gas refrigerant from the non-defrosting air heat exchanger module. Another part of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 passes through the E port of the four-way valve 2 and the four-way valve 3 in the four-way valve assembly 2, flows through the solenoid valve 2 and the solenoid valve 3 of the third valve assembly 7, enters the cold / hot water heat exchanger 6 and exchanges heat with hot water and condenses therein. The condensed normal temperature and high-pressure liquid refrigerant passes through the electronic expansion valve 2 and the electronic expansion valve 3 in the second valve assembly 5 to be throttled to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, enters the air heat exchanger 2 and the air heat exchanger 3 in the air heat exchanger assembly 3, exchanges heat with the air therein and evaporates. The evaporated low-temperature and low-pressure gaseous refrigerant enters the C port of the four-way valve in the four-way valve assembly 2, and then passes through the S port of the four-way valve in the four-way valve assembly 2, merges with the refrigerant from the balance tank 8, and finally reaches the suction port of the compressor 1 and returns to the compressor 1, completing a complete defrost cycle.

[0059] During the defrosting process of the embodiment of the present application, the defrosting air heat exchanger module and the non-defrosting air heat exchanger module are relatively independent. The liquid refrigerant condensed in the defrosting air heat exchanger module enters the balance tank 8 through the drain pipe, and then slowly returns to the suction pipe of the compressor 1 through the liquid guide pipe. On the one hand, there is no large amount of liquid refrigerant accumulated in the defrosting air heat exchanger module during the defrosting process, the heat exchange effect is significantly enhanced, the defrosting efficiency is improved, and the defrosting time is shortened. On the other hand, the liquid refrigerant condensed in the defrosting air heat exchanger module during the defrosting process does not directly enter other non-defrosting air heat exchanger modules, and will not have an adverse effect on the non-defrosting air heat exchanger modules, thereby avoiding the frosted air heat exchanger module, whose heat transfer effect is already weakened, causing the outlet superheat to decrease due to the entry of a large amount of liquid refrigerant, and ultimately causing liquid return to the suction of the compressor 1. In addition, the refrigerant flow entering each air heat exchanger module in the heating mode is independently controlled by the corresponding valve component, which solves the problem of unreasonable refrigerant distribution in the heat exchange in the heating mode and maximizes the utilization of the heat exchange area of the heat exchange. There is no need to switch heating / cooling mode when entering defrost, and the system stability is significantly improved. The heat required for the air heat exchanger module entering defrost comes from other air heat exchanger modules that are still acting as evaporators, which greatly reduces the impact of the defrost process on the user side and avoids large fluctuations in hot water temperature. In addition, during the defrost process, the liquid refrigerant generated by the condensation of the defrost air heat exchanger module is first introduced into the balance tank 8, and then the refrigerant in the balance tank 8 is slowly introduced into the intake port of the compressor 1. During the defrost process, there is no large amount of liquid refrigerant accumulation in the defrost air heat exchanger module, which enhances the heat transfer effect of the heat exchanger, shortens the defrost time, and improves the defrost efficiency. Secondly, the liquid refrigerant generated during the defrost process does not directly enter other frosted air heat exchanger modules, and does not have an adverse effect on the heat exchange of non-defrost air heat exchanger modules, which is conducive to avoiding liquid backflow caused by the deterioration of the heat exchange effect of the air heat exchanger module.

[0060] The present application also provides a defrosting method for an air conditioner. Figure 3 The specific steps are as follows:

[0061] 301. Obtain frost levels of multiple air heat exchangers in a heating mode.

[0062] The defrost device can obtain real-time information about the degree of frost on multiple air heat exchangers (air heat exchanger modules) in parallel on an air conditioning unit in heating mode. It is understood that an air conditioning unit generally enters heating mode when the ambient temperature is low. Therefore, during the operation of the air conditioning unit in heating mode, frost may form on one of the air heat exchangers in the air heat exchanger assembly. The defrost device can use a temperature sensor or camera to determine the degree of frost on each air heat exchanger. The frost degree can refer to the thickness or area of frost, which is not limited to this.

[0063] 302. Determine the target air heat exchanger that needs to be defrosted based on the degree of frost.

[0064] The defrost device can determine the target air heat exchanger for defrosting based on the degree of frost. Specifically, the defrost device can determine the target air heat exchanger for defrosting based on the frost thickness. If the frost thickness of a particular air heat exchanger reaches a preset thickness, the air heat exchanger is determined to meet the defrost conditions and is the target air heat exchanger for defrosting. The preset thickness can be 5 mm or 8 mm, and is not specifically limited here.

[0065] 303. Defrost the target air heat exchanger and keep other air heat exchangers operating in heating mode.

[0066] The defrosting device defrosts the target air heat exchanger. Specifically, a high-temperature, high-pressure refrigerant can be used to flow through the target air heat exchanger to defrost the target air heat exchanger. At the same time, other air heat exchangers that have not met the defrost conditions continue to operate in heating mode. It is understood that defrosting is generally performed in groups of air heat exchangers. When one group of air heat exchangers in the air heat exchanger assembly is undergoing defrosting, the other air heat exchangers are not allowed to enter defrosting. After the air heat exchanger undergoing defrosting exits defrosting, the other air heat exchangers that meet the defrost conditions are allowed to enter defrosting. The air heat exchanger that meets the defrost conditions for a longer period of time is given priority for defrosting.

[0067] In this embodiment, the degree of frost on each group of air heat exchanger modules in the air heat exchanger assembly during heating is used as a defrost condition to determine which air heat exchanger module should first enter the defrost process. The air heat exchanger assembly is divided into several modules connected in parallel, and each air heat exchanger module is defrosted sequentially based on its degree of frost.

[0068] The present application also provides a defrosting device for an air conditioner, such as Figure 4 As shown, including:

[0069] An acquisition unit 401 is configured to acquire frost levels of multiple air heat exchangers in a heating mode;

[0070] A determination unit 402 is configured to determine a target air heat exchanger that needs to be defrosted according to the frost degree;

[0071] The execution unit 403 is configured to defrost the target air heat exchanger and keep other air heat exchangers running in the heating mode.

[0072] The present application also provides a defrosting device 500 for an air conditioner. Figure 5 As shown, including:

[0073] CPU 501, memory 502, input / output interface 503, wired or wireless network interface 504, power supply 505;

[0074] The memory 502 is a temporary storage memory or a permanent storage memory;

[0075] The central processor 501 is configured to communicate with the memory 502 and execute the instruction operations in the memory 502 on the control plane functional entity to perform the above-mentioned defrosting method.

[0076] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0077] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0078] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0079] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0080] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, read-only memory), random access memory (RAM, random access memory), disk or optical disk, and other media that can store program code.

Claims

1. A defrosting device for an air conditioner, used for defrosting an air heat exchanger, characterized in that: include: A compressor, a heat exchanger, a plurality of first passage valves, a plurality of second passage valves, a control device, and a balance tank; The exhaust port of the compressor is connected to the air inlet of each of the first passage valves, and the air inlet of the compressor is respectively connected to the exhaust port of each of the first passage valves and the first port of the balance tank; The first port of each of the first passage valves is connected to the first port of a different air heat exchanger, and the second port of each of the first passage valves is connected to the first port of the heat exchanger; The second port of the balancing tank is connected to the first port of each second passage valve, the second port of each second passage valve is respectively connected to the second port of a different air heat exchanger, and the third port of each second passage valve is connected to the second port of the heat exchanger; The control device is connected to the first passage valve and the second passage valve, respectively, and is used to control the air inlet and the first port of the first passage valve corresponding to the target air heat exchanger to be connected when there is a target air heat exchanger that needs to be defrosted, and to control the first port and the second port of the second passage valve corresponding to the target air heat exchanger to be connected, so that the liquid refrigerant condensed in the target air heat exchanger flows into the balancing tank and is introduced into the air inlet of the compressor through the balancing tank; The defrost device further includes: a fourth valve; The first port of the balancing tank is connected to the first port of the fourth valve, and the second port of the fourth valve is connected to the air inlet of the compressor; the fourth valve is used to throttle the liquid refrigerant flowing out of the first port of the balancing tank into a low-temperature and low-pressure gas-liquid two-phase refrigerant.

2. The defrosting device according to claim 1, characterized in that: The first passage valve is a four-way valve, and the second passage valve includes a first valve and a second valve, wherein the second port of the air heat exchanger is connected to the first port of the corresponding first valve and the first port of the second valve respectively, the second port of each first valve is connected to the second port of the balancing tank, and the second port of each second valve is connected to the second port of the heat exchanger; The control device is specifically used to control the air inlet and the first port of the four-way valve corresponding to the target air heat exchanger to be connected, and to control the first port and the second port of the first valve corresponding to the target air heat exchanger to be connected.

3. The defrosting device according to claim 2, characterized in that: Also includes: multiple third valves; The second port of each of the four-way valves is respectively connected to the first port of a different third valve; The first port of the heat exchanger is connected to the second port of each of the third valves.

4. The defrosting device according to claim 3, characterized in that: The size of the balancing tank is determined according to the volume of a single heat exchanger module in the air heat exchanger, the maximum diameter of the fourth valve, and the liquid guiding speed.

5. The defrosting device according to claim 3, characterized in that: The control device is connected to the third valve and the fourth valve respectively, and is also used to control the connection between the air inlet of each four-way valve and the first port and the connection between the second port and the exhaust port when the air conditioner operates in the cooling mode, control each first valve to be closed and each second valve to be opened, control each third valve to be opened and the fourth valve to be opened, and control the opening of the fourth valve according to the relative situation of the suction superheat of the compressor and the target temperature threshold.

6. The device according to claim 3, characterized in that The control device is connected to the third valve and the fourth valve respectively, and is also used to, when the air conditioner operates in heating mode, control the connection between the air inlet and the second port of each four-way valve and the connection between the first port and the exhaust port, control each first valve to be closed and each second valve to be opened, control each third valve to be opened and the fourth valve to be opened, and control the opening of the fourth valve according to the relative situation of the suction superheat of the compressor and the target temperature threshold.

7. The device according to claim 6, characterized in that The control device is connected to the air heat exchanger and is also used to control the target air heat exchanger to stop running when the target air heat exchanger is defrosted, control the air inlet of the four-way valve corresponding to the target air heat exchanger to be connected to the first port and the second port to be connected to the exhaust port, control the second valve and the third valve corresponding to the target air heat exchanger to be closed, and control the first valve corresponding to the target air heat exchanger to be connected and control the fourth valve to be closed.

8. A defrosting method for an air conditioner, characterized in that: include: Get the frost degree of multiple air heat exchangers in heating mode; determining a target air heat exchanger that needs to be defrosted according to the frosting degree; The defrosting device of the air conditioner according to any one of claims 1 to 7 is controlled to defrost the target air heat exchanger and keep other air heat exchangers running in the heating mode.

9. A defrosting device for an air conditioner, characterized in that: include: An acquisition unit, configured to acquire frost levels of multiple air heat exchangers in a heating mode; a determining unit, configured to determine a target air heat exchanger that needs to be defrosted according to the frosting degree; An execution unit is used to control the defrosting device of the air conditioner according to any one of claims 1 to 7 to defrost the target air heat exchanger and keep other air heat exchangers running in the heating mode.

10. A defrosting device for an air conditioner, characterized in that: include: CPU, memory, input and output interfaces, wired or wireless network interfaces, power supply; The memory is a transient storage memory or a persistent storage memory; The central processor is configured to communicate with the memory and execute instructions in the memory on a control plane function entity to perform the method according to claim 8.

11. A computer-readable storage medium, characterized in that The computer-readable storage medium includes instructions, which, when executed on a computer, cause the computer to perform the method of claim 8 .

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