Air conditioner

Abstract

The invention discloses an air conditioner which comprises a water tank used for storing domestic water; the first heat exchanger is located outdoors; the second heat exchanger is connected with the water tank; the third heat exchanger is located indoors; the compressor is provided with an exhaust port and an air inlet; the head end of the first pipeline and the head end of the second pipeline are both used for being connected with the exhaust port, the tail end of the first pipeline and the tail end of the second pipeline are both used for being connected with the head end of the third pipeline, the tail end of the third pipeline is used for being connected with the exhaust port, and the first heat exchanger is located on the first pipeline; the second heat exchanger is located on the second pipeline. The third heat exchanger is located on the third pipeline. The control valve is arranged between the exhaust port and the head end of the first pipeline, the head end of the second pipeline, the tail end of the third pipeline and the air inlet, and the air conditioner can be quickly defrosted through heat of the water tank.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular, to an air conditioner. Background Art

[0002] In the related art, when defrosting, the existing air conditioner uses the way of circulating water to absorb heat to achieve the defrosting function, and cannot utilize the heat provided by the hot water in the water tank for defrosting. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, an object of the present invention is to provide an air conditioner, by using which the air conditioner can be quickly defrosted by using the heat of the water tank, so as to ensure that the air conditioner can effectively defrost under extremely low temperatures and improve the reliability of the air conditioner.

[0004] To solve the above problems, an air conditioner according to an embodiment of the first aspect of the present invention includes: a water tank for storing domestic water; a first heat exchanger located outdoors for exchanging heat with the circulating refrigerant; a second heat exchanger connected to the water tank for exchanging heat with the domestic water; a third heat exchanger located indoors for adjusting the indoor temperature; a compressor having an exhaust port and an intake port; a first pipeline, a second pipeline and a third pipeline. The head ends of the first pipeline and the second pipeline are both used to connect to the exhaust port, the tail ends of the first pipeline and the second pipeline are both used to connect to the head end of the third pipeline, the tail end of the third pipeline is used to connect to the exhaust port, the first heat exchanger is located on the first pipeline, the second heat exchanger is located on the second pipeline, and the third heat exchanger is located on the third pipeline; a control valve provided between the exhaust port and the head end of the first pipeline, the head end of the second pipeline, the tail end of the third pipeline, and the intake port, and the control valve is used to change the flow direction of the refrigerant discharged from the exhaust port; a controller connected to the control valve, and the controller is configured to: in the defrosting mode, determine that the temperature of the domestic water is higher than a first preset temperature; control the conduction condition of the control valve to guide the refrigerant discharged from the exhaust port to sequentially pass through the first pipeline and the second pipeline and then enter the intake port.

[0005] An air conditioner according to an embodiment of the present invention has three heat exchangers respectively arranged on different pipelines, and control valves are arranged between each pipeline and the exhaust port of the compressor to regulate the refrigerant flow direction. Thus, when the air conditioner operates in the defrosting mode, the refrigerant discharged by the compressor no longer preferentially passes through the water tank, but first enters the first heat exchanger through the first pipeline for defrosting. Therefore, in this application, the flow direction of the refrigerant discharged from the exhaust port of the compressor is changed by the control valve, so that when operating in the defrosting mode, the refrigerant first passes through the first heat exchanger and then flows to the water tank, so as to quickly defrost the first heat exchanger by using the heat provided by the hot water in the water tank, and the heating of the user end is not affected. At the same time, it is ensured that effective defrosting can be achieved even in extremely low temperatures, improving the reliability of the air conditioner.

[0006] In some embodiments, the air conditioner further includes a first expansion valve, a second expansion valve, and a third expansion valve. The first expansion valve is arranged on the first pipeline, the second expansion valve is arranged on the second pipeline, and the third expansion valve is arranged on the third pipeline; the control valve includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve, and a seventh solenoid valve. The first solenoid valve is arranged between the exhaust port and the first end of the sixth solenoid valve, the second solenoid valve is arranged between the exhaust port and the head end of the second pipeline, the second solenoid valve is arranged between the exhaust port and the end of the third pipeline. The first end of the fourth solenoid valve is connected to the third solenoid valve and the end of the third pipeline. The second end of the fourth solenoid valve is connected to the first end of the fifth solenoid valve, the first end of the seventh solenoid valve, and the intake port. The second end of the sixth solenoid valve is connected to the head end of the first pipeline and the second end of the seventh solenoid valve.

[0007] The above technical solution has the following advantages or beneficial effects: In this application, a scheme of three expansion valves and seven solenoid valves in parallel and in series is adopted to change the flow direction of the refrigerant discharged from the exhaust port of the compressor, so that when operating in the defrosting mode, the refrigerant first passes through the first heat exchanger and then flows to the water tank, so as to quickly defrost the first heat exchanger by using the heat provided by the hot water in the water tank, ensuring effective defrosting even in extremely low temperatures and improving the reliability of the air conditioner.

[0008] In some embodiments, for controlling the conduction of the control valve to guide the refrigerant discharged from the exhaust port to enter the intake port successively through the first pipeline and the second pipeline, the controller is specifically configured to: control the first expansion valve and the second expansion valve to conduct; control the first solenoid valve, the fifth solenoid valve, and the sixth solenoid valve to conduct, and control the second solenoid valve, the fourth solenoid valve, and the seventh solenoid valve to close, so as to guide the refrigerant discharged from the exhaust port to enter the intake port successively through the first pipeline and the second pipeline.

[0009] The above technical solution has the following advantages or beneficial effects: In this application, seven solenoid valves and three electronic expansion valves are connected in parallel and in series to change the flow direction of the refrigerant discharged from the compressor exhaust port. Thus, when the defrosting mode is running, the refrigerant is controlled to first pass through the first heat exchanger and then flow to the water tank, so as to quickly defrost the first heat exchanger by using the heat provided by the hot water in the water tank, and the heating of the user end will not be affected. At the same time, it can also ensure effective defrosting even in extremely low temperatures, improving the reliability of the air conditioner.

[0010] In some embodiments, the defrosting mode includes a first defrosting mode and a second defrosting mode. Among them, in the first defrosting mode, the third expansion valve and the third solenoid valve are controlled to be closed, and in the second defrosting mode, the third expansion valve and the third solenoid valve are controlled to be turned on.

[0011] The above technical solution has the following advantages or beneficial effects: In this application, the on-off conditions of each solenoid valve and each expansion valve are controlled through the first defrosting mode, so as to control the refrigerant discharged from the exhaust port to sequentially enter the first pipeline and the second pipeline, so that the air conditioner realizes shutdown defrosting; through the second defrosting mode, the on-off conditions of each solenoid valve and each expansion valve are controlled, so as to control the refrigerant discharged from the exhaust port to sequentially enter the first pipeline and the second pipeline, and at the same time control the refrigerant discharged from the exhaust port to sequentially enter the third pipeline and the second pipeline, so that the air conditioner can defrost while heating, realizing the function of defrosting without shutdown.

[0012] In some embodiments, the controller is further configured to: in the defrosting mode, control the compressor to reduce its frequency to a first target operating frequency; after the compressor maintains operation for a first preset duration, control the first solenoid valve, the fifth solenoid valve, and the sixth solenoid valve to be turned on, control the first expansion valve to be fully open, and control the opening degree of the second expansion valve to be the target defrosting opening degree, and control the outdoor fan to stop; after the compressor runs for the first preset duration again, control the compressor to increase its frequency to the target defrosting frequency.

[0013] The above technical solution has the following advantages or beneficial effects: Adjusting the frequency of the compressor adaptively according to the above conditions can ensure the stable operation of the compressor during defrosting.

[0014] In some embodiments, in the first defrosting mode, the controller is further configured to: when the first defrosting exit condition is met, control the air conditioner to exit the first defrosting mode, where the first defrosting exit condition is that the coil temperature of the first heat exchanger is higher than a preset temperature threshold or the defrosting operation time reaches a second preset duration.

[0015] The above technical solution has the following advantages or beneficial effects: In this application, it is determined whether the air conditioner can exit the first defrost mode based on the coil temperature and the defrost operation time, so as to ensure that while effectively melting the frost layer, unnecessary energy consumption is avoided.

[0016] In some embodiments, in the second defrost mode, the controller is further configured to: after determining that the defrost operation time reaches a fourth preset duration and the coil temperature of the first heat exchanger is lower than a preset temperature threshold, control the operating frequency of the compressor to be a second target operating frequency, and the second target operating frequency is greater than the target defrost frequency.

[0017] The above technical solution has the following advantages or beneficial effects: During the operation of the air conditioner in the second defrost mode, the heating capacity of the air conditioner is determined by the defrost operation time, so as to adjust the operating frequency of the compressor through the heating capacity of the air conditioner to increase the heating capacity of the air conditioner, thereby avoiding the problem that the first heat exchanger cannot defrost quickly due to insufficient heating capacity of the air conditioner and improving the defrost speed.

[0018] In some embodiments, the controller is further configured to: when the second defrost exit condition is met, control the air conditioner to exit the second defrost mode, where the second defrost exit condition is that the coil temperature of the first heat exchanger is higher than the preset temperature threshold.

[0019] The above technical solution has the following advantages or beneficial effects: In this application, it is determined whether the air conditioner can exit the second defrost mode based on the coil temperature, so as to ensure that while effectively melting the frost layer, unnecessary energy consumption is avoided.

[0020] In some embodiments, the controller is further configured to: when it is determined that the temperature difference between the coil temperature of the first heat exchanger and the outdoor ambient temperature is within the frosting temperature range and the operating duration of the air conditioner reaches a first preset duration, control the air conditioner to enter the defrost mode.

[0021] The above technical solution has the following advantages or beneficial effects: In this application, it is determined whether the first heat exchanger is frosted based on the temperature difference between the coil temperature of the first heat exchanger and the outdoor ambient temperature and the operating duration of the air conditioner, so as to control the air conditioner to operate in the defrost mode after determining that the first heat exchanger is frosted, so that the air conditioner can defrost the first heat exchanger in time.

[0022] In some embodiments, the air conditioner further includes a water pump, the water pump is arranged on the connecting pipeline between the second heat exchanger and the water tank, and the controller is further configured to: in the defrost mode, control the water pump to operate at the maximum speed.

[0023] The above technical solution has the following advantages or beneficial effects: When the air conditioner is in the defrosting mode, the water pump is controlled to operate at the maximum speed to provide the maximum power for the water flow between the second heat exchanger and the water tank, thereby accelerating the absorption of the heat of domestic hot water.

[0024] The additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which: Figure 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention; Figure 2 is a flowchart of the control by a controller according to an embodiment of the present invention; Figure 3 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention; Figure 4 is a flowchart of the defrosting mode control according to an embodiment of the present invention; Figure 5 is a schematic diagram of the refrigerant flow of an air conditioner according to an embodiment of the present invention; Figure 6 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 7 is a schematic table diagram of the solenoid valve control according to an embodiment of the present invention; Figure 8 is a flowchart of the defrosting mode according to an embodiment of the present invention; Figure 9 is a flowchart of the first defrosting mode according to an embodiment of the present invention; Figure 10 is a flowchart of the second defrosting mode according to an embodiment of the present invention.

[0026] Reference Signs: Air conditioner 100; Water tank 1; First heat exchanger 2; Second heat exchanger 3; Third heat exchanger 4; Compressor 5; First pipeline 6; Second pipeline 7; Third pipeline 8; First solenoid valve 10; Second solenoid valve 11; Third solenoid valve 12; First expansion valve 13; Second expansion valve 14; Third expansion valve 15; Fourth solenoid valve 16; Fifth solenoid valve 17; Sixth solenoid valve 18; Seventh solenoid valve 19; First water pump 20; Second water pump 21; Control valve 30. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention will be described in detail below.

[0028] To solve the above problems, an embodiment of the first aspect of the present invention provides an air conditioner. By using this air conditioner, the heat of the water tank can be utilized to quickly defrost the air conditioner, thereby ensuring that the air conditioner can effectively defrost even at extremely low temperatures and improving the reliability of the air conditioner.

[0029] The following refers to Figure 1 to describe the air conditioner 100 according to an embodiment of the present invention. As Figure 1 shown, the air conditioner 100 includes: a water tank 1, a first heat exchanger 2, a second heat exchanger 3, a third heat exchanger 4, a compressor 5, a first pipeline 6, a second pipeline 7, a third pipeline 8, and a control valve.

[0030] Among them, the water tank 1 is used to store domestic water; the first heat exchanger 2 is located outdoors, and the first heat exchanger 2 can be a fin heat exchanger for exchanging heat with the circulating refrigerant; the second heat exchanger 3 is connected to the water tank 1 for exchanging heat with domestic water. Among them, the second heat exchanger 3 can be a tube heat exchanger or a plate heat exchanger, or other devices for exchanging heat between refrigerant and water; the third heat exchanger 4 is located indoors for adjusting the indoor temperature, and the third heat exchanger 4 can be a plate heat exchanger; the compressor 5 has an exhaust port and an intake port; the first ends of the first pipeline 6 and the second pipeline 7 are both used to connect to the exhaust port, the second ends of the first pipeline 6 and the second pipeline 7 are both used to connect to the first end of the third pipeline 8, the second end of the third pipeline 8 is used to connect to the exhaust port, the first heat exchanger 2 is located on the first pipeline 6, the second heat exchanger 3 is located on the second pipeline 7, and the third heat exchanger 4 is located on the third pipeline 8; the control valve is arranged between the exhaust port and the first end of the first pipeline 6, the first end of the second pipeline 7, the second end of the third pipeline 8, and the intake port. The control valve is used to change the flow direction of the refrigerant discharged from the exhaust port and can also be used for pipeline flow regulation.

[0031] In the embodiment, the air conditioner 100 further includes a controller, and the controller is connected to the control valve. As Figure 2 shown, the controller is configured to perform the following steps.

[0032] Step S1, in the defrosting mode, determine that the domestic water temperature is higher than the first preset temperature.

[0033] Among them, the first preset temperature can be understood as the temperature value of domestic water preset according to experiments whether it can melt ice and frost. The first preset temperature can be 10°C, and no specific limitation is made thereto.

[0034] Specifically, when the temperature of domestic water is low, the first heat exchanger 2 uses the heat of domestic water for defrosting. If the frost cannot be melted quickly and effectively, it will increase energy consumption and defrosting costs. Based on this, in the defrosting mode of this application, it is necessary to determine that the temperature of domestic water is higher than the first preset temperature. Only then can the heat of the domestic water in the water tank 1 be used for defrosting, thereby ensuring the defrosting effect of the first heat exchanger 2 and improving the energy utilization efficiency.

[0035] Step S2: Control the conduction state of the control valve to guide the refrigerant discharged from the exhaust port to enter the intake port through the first pipeline 6 and the second pipeline 7 in sequence.

[0036] Specifically, to solve this problem, this application adds the heat source of the water tank 1 as the heat source for defrosting. When the air conditioner 100 is operating in the defrosting mode, control the conduction state of the control valve to guide the refrigerant discharged from the exhaust port to enter the intake port through the first pipeline 6 and the second pipeline 7 in sequence. That is to say, the refrigerant discharged from the exhaust port of the compressor 5 no longer first enters the water tank 1 to heat the water tank 1, but first passes through the first heat exchanger 2 of the first pipeline 6 for defrosting, and then enters the second pipeline 7 to absorb the heat of the hot water in the water tank 1 through the second heat exchanger 3 and then returns to the compressor 5. Specifically, after the refrigerant absorbs the heat of the water tank 1 and returns to the compressor 5, the refrigerant is discharged from the exhaust port again. The refrigerant discharged from the exhaust port first passes through the first pipeline 6 and enters the first heat exchanger 2 under the action of the conduction state of the control valve, so that the frost on the first heat exchanger 2 melts. Then, the heat-exchanged refrigerant enters the second heat exchanger 3 through the second pipeline 7 under the action of the conduction state of the control valve and exchanges heat with the hot water in the water tank 1 in the second heat exchanger 3. The gaseous refrigerant after absorbing heat flows back to the intake port of the compressor 5, thus completing the refrigerant cycle of defrosting. Therefore, in this application, the flow direction of the refrigerant discharged from the exhaust port of the compressor 5 is changed through the control valve, so that when the defrosting mode is running, the refrigerant is controlled to pass through the first heat exchanger 2 first and then flow to the water tank 1, so as to quickly defrost the first heat exchanger 2 by using the heat provided by the hot water in the water tank 1, and the heating of the user end will not be affected. At the same time, it is ensured that effective defrosting can be achieved even in extremely low temperatures, improving the reliability of the air conditioner 100.

[0037] According to the air conditioner 100 of an embodiment of the present invention, three heat exchangers are respectively arranged on different pipelines, and control valves are arranged between each pipeline and the exhaust port of the compressor 5 to adjust the refrigerant flow direction. Thus, when the air conditioner 100 operates in the defrosting mode, the refrigerant discharged by the compressor 5 does not preferentially pass through the water tank 1, but first enters the first heat exchanger 2 through the first pipeline 6 for defrosting. Thus, in this application, the flow direction of the refrigerant discharged from the exhaust port of the compressor 5 is changed by the control valve, so as to control the refrigerant to first pass through the first heat exchanger 2 and then flow to the water tank 1 when operating in the defrosting mode, so as to quickly defrost the first heat exchanger 2 by using the heat provided by the hot water in the water tank 1, and the heating of the user end is not affected, and at the same time, it is ensured that effective defrosting can be achieved even in extremely low temperatures, improving the reliability of the air conditioner 100.

[0038] In the embodiment, first, the operating mode of the air conditioner 100 is judged. If the operating mode is not one or a combination of the heating or hot water heating modes, the first heat exchanger 2 will not frost, and the air conditioner 100 does not need to operate the defrosting mode. In one or a combination of the heating or hot water heating modes, then the operating environment temperature of the air conditioner 100 is judged. If the operating environment temperature ≥ the preset environment temperature, where the preset environment temperature can be 4°C, then the air conditioner 100 does not need to operate the defrosting mode; on the contrary, if the operating environment temperature is less than the preset environment temperature, at this time, the air conditioner 100 needs to judge whether to operate the defrosting mode.

[0039] In some embodiments, as Figure 3 shown, the air conditioner 100 further includes a first expansion valve 13, a second expansion valve 14 and a third expansion valve 15. Among them, the first expansion valve 13, the second expansion valve 14 and the third expansion valve 15 are used to adjust the pipeline flow rate, and the control valve 30 includes a first solenoid valve 10, a second solenoid valve 11, a third solenoid valve 12, a fourth solenoid valve 16, a fifth solenoid valve 17, a sixth solenoid valve 18 and a seventh solenoid valve 19.

[0040] Among them, the first expansion valve 13 is arranged on the first pipeline 6, the second expansion valve 14 is arranged on the second pipeline 7, and the third expansion valve 15 is arranged on the third pipeline 8; the first solenoid valve 10 is arranged between the exhaust port and the first end of the sixth solenoid valve 18, the second solenoid valve 11 is arranged between the exhaust port and the head end of the second pipeline 7, the second solenoid valve 11 is arranged between the exhaust port and the end of the third pipeline 8, the first end of the fourth solenoid valve 16 is connected to the third solenoid valve 12 and the end of the third pipeline 8, the second end of the fourth solenoid valve 16 is connected to the first end of the fifth solenoid valve 17, the first end of the seventh solenoid valve 19 and the intake port, and the second end of the sixth solenoid valve 18 is connected to the head end of the first pipeline 6 and the second end of the seventh solenoid valve 19.

[0041] Specifically, to solve this problem, when the air conditioner 100 operates in the defrosting mode, the conduction states of the first expansion valve 13, the second expansion valve 14, the third expansion valve 15, the first solenoid valve 10, the second solenoid valve 11, the third solenoid valve 12, the fourth solenoid valve 16, the fifth solenoid valve 17, the sixth solenoid valve 18, and the seventh solenoid valve 19 are controlled to guide the refrigerant discharged from the exhaust port to enter the intake port successively through the first pipeline 6 and the second pipeline 7. That is to say, the refrigerant absorbs the heat of the water tank 1, returns to the compressor 5, and then discharges the refrigerant through the exhaust port. The refrigerant discharged from the exhaust port first enters the first heat exchanger 2 through the first pipeline 6 under the action of the conduction states of the control valves, so that the frost on the first heat exchanger 2 melts. Then, the heat-exchanged refrigerant enters the second heat exchanger 3 through the second pipeline 7 and exchanges heat with the hot water in the water tank 1 in the second heat exchanger 3. The gaseous refrigerant after absorbing heat flows back to the intake port of the compressor 5, thus completing the refrigerant cycle for defrosting. Therefore, in this application, a scheme of three expansion valves and seven solenoid valves connected in parallel and in series is adopted to change the flow direction of the refrigerant discharged from the exhaust port of the compressor 5, so as to control the refrigerant to pass through the first heat exchanger 2 first and then flow to the water tank 1 when operating in the defrosting mode, so as to quickly defrost the first heat exchanger 2 by using the heat provided by the hot water in the water tank 1, ensuring effective defrosting even under extremely low temperatures and improving the reliability of the air conditioner 100.

[0042] In some embodiments, for controlling the conduction states of the control valves to guide the refrigerant discharged from the exhaust port to enter the intake port successively through the first pipeline 6 and the second pipeline 7, as Figure 4 shown, the controller is specifically configured to perform the following steps.

[0043] Step S3: Control the first expansion valve 13 and the second expansion valve 14 to conduct.

[0044] Step S4: Control the first solenoid valve 10, the fifth solenoid valve 17, and the sixth solenoid valve 18 to conduct, and control the second solenoid valve 11, the fourth solenoid valve 16, and the seventh solenoid valve 19 to close, so as to guide the refrigerant discharged from the exhaust port to enter the intake port successively through the first pipeline 6 and the second pipeline 7.

[0045] Specifically, in the defrosting mode, the air conditioner 100 controls the first expansion valve 13 and the second expansion valve 14 to be turned on, controls the first solenoid valve 10, the fifth solenoid valve 17, and the sixth solenoid valve 18 to be turned on, and controls the second solenoid valve 11, the fourth solenoid valve 16, and the seventh solenoid valve 19 to be turned off. It guides the high-temperature gaseous refrigerant discharged from the exhaust port of the compressor 5 to enter the first heat exchanger 2 through the first pipeline 6, so that the frost on the first heat exchanger 2 melts. Then, the heat-exchanged refrigerant flows back to the intake port of the compressor 5 through the second pipeline 7. Thus, the refrigerant cycle for defrosting is completed. Therefore, in this application, a parallel and series connection method of seven solenoid valves and three electronic expansion valves is used to change the flow direction of the refrigerant discharged from the exhaust port of the compressor 5, so as to control the refrigerant to first pass through the first heat exchanger 2 and then flow to the water tank 1 when the defrosting mode is running, so as to quickly defrost the first heat exchanger 2 by using the heat provided by the hot water in the water tank 1. Moreover, the heating of the user end will not be affected, and at the same time, it can ensure effective defrosting even under extremely low temperatures, improving the reliability of the air conditioner 100.

[0046] In some embodiments, the defrosting mode includes a first defrosting mode and a second defrosting mode. Among them, in the first defrosting mode, the third expansion valve 15 and the third solenoid valve 12 are controlled to be turned off, and in the second defrosting mode, the third expansion valve 15 and the third solenoid valve 12 are controlled to be turned on.

[0047] Specifically, when the air conditioner 100 is running in the first defrosting mode, that is, when the air conditioner 100 stops running the heating mode and then runs the defrosting mode, the air conditioner 100 realizes defrosting during shutdown. That is to say, as Figure 5 shown, under the action of the first solenoid valve 10 and the sixth solenoid valve 18 being turned on, and the second solenoid valve 11 and the third solenoid valve 12 being turned off, the high-temperature gaseous refrigerant discharged from the compressor 5 flows into the first heat exchanger 2 through the first pipeline 6. After that, the high-temperature gaseous refrigerant exchanges heat with the first heat exchanger 2 to melt the frost on the first heat exchanger 2. The heat-exchanged refrigerant enters the second pipeline 7 under the action of the first expansion valve 13 and the second expansion valve 14 being turned on and the third expansion valve 15 being turned off, and enters the second heat exchanger 3 after being throttled into a low-temperature and low-pressure vapor-liquid two-phase refrigerant by the first expansion valve 13 and the second expansion valve 14. In the second heat exchanger 3, it exchanges heat with the hot water in the water tank 1 to further reduce the temperature of the refrigerant. The heat-exchanged refrigerant enters the intake port of the compressor 5 through the fifth solenoid valve 17 under the action of the second solenoid valve 11, the fourth solenoid valve 16, and the seventh solenoid valve 19 being turned off and the fifth solenoid valve 17 being turned on, completing the refrigerant cycle for defrosting. Therefore, in this application, the conduction conditions of each solenoid valve and each expansion valve are controlled through the first defrosting mode, so as to control the refrigerant discharged from the exhaust port to enter the first pipeline 6 and the second pipeline 7 in sequence, so that the air conditioner 100 realizes defrosting during shutdown.

[0048] Alternatively, when the air conditioner 100 operates in the second defrosting mode, that is, when the air conditioner 100 operates in the heating mode and the defrosting mode simultaneously, the air conditioner 100 realizes defrosting without stopping, that is, as Figure 6 shown, under the action of the conduction of the first solenoid valve 10 and the sixth solenoid valve 18 and the closing of the second solenoid valve 11, a part of the high-temperature gaseous refrigerant discharged by the compressor 5 flows through the first pipeline 6 into the first heat exchanger 2, and the high-temperature gaseous refrigerant exchanges heat with the first heat exchanger 2 to melt the frost on the first heat exchanger 2. After heat exchange, the refrigerant enters the second pipeline 7 under the action of the conduction of the first expansion valve 13 and the second expansion valve 14 and the closing of the third expansion valve 15, and enters the second heat exchanger 3 after being throttled into a low-temperature and low-pressure vapor-liquid two-phase refrigerant by the first expansion valve 13 and the second expansion valve 14. In the second heat exchanger 3, it exchanges heat with the hot water in the water tank 1 to further reduce the temperature of the refrigerant. After heat exchange, the refrigerant enters the intake port of the compressor 5 through the fifth solenoid valve 17 under the action of the closing of the second solenoid valve 11, the fourth solenoid valve 16 and the seventh solenoid valve 19 and the conduction of the fifth solenoid valve 17. At the same time, another part of the high-temperature gaseous refrigerant enters the third heat exchanger 4 to exchange heat with the water on the other side of the third heat exchanger 4 under the action of the conduction of the third solenoid valve 12, so as to heat the heating circulating water. After heat exchange, the refrigerant enters the second heat exchanger 3 after being throttled into a low-temperature and low-pressure vapor-liquid two-phase refrigerant by the third expansion valve 15 and the second expansion valve 14 under the action of the conduction of the third expansion valve 15. In the second heat exchanger 3, it exchanges heat with the hot water in the water tank 1 to further reduce the temperature of the refrigerant. After heat exchange, the refrigerant enters the intake port of the compressor 5 through the fifth solenoid valve 17 under the action of the closing of the second solenoid valve 11, the fourth solenoid valve 16 and the seventh solenoid valve 19 and the conduction of the fifth solenoid valve 17, completing the refrigerant cycle of defrosting. Thus, in the present application, the conduction conditions of each solenoid valve and each expansion valve are controlled through the second defrosting mode, so as to control the refrigerant discharged from the exhaust port to enter the first pipeline 6 and the second pipeline 7 in sequence, and at the same time control the refrigerant discharged from the exhaust port to enter the third pipeline 8 and the second pipeline 7 in sequence, so that the air conditioner 100 can defrost while heating, realizing the function of defrosting without stopping, and the heating will not be interrupted, thereby making the user experience more comfortable.

[0049] In an embodiment, as Figure 7 shown, when the air conditioner 100 operates in the heating mode or the heating mode and the defrosting mode operate simultaneously, the conduction or closing conditions of the first solenoid valve 10, the second solenoid valve 11, the third solenoid valve 12, the fourth solenoid valve 16, the fifth solenoid valve 17, the sixth solenoid valve 18 and the seventh solenoid valve 19 are controlled.

[0050] In some embodiments, as Figure 8 shown, the controller is further configured to: perform the following steps.

[0051] Step S5, in the defrosting mode, control the compressor 5 to reduce its frequency to the first target operating frequency.

[0052] Step S6, after the compressor 5 has been running for the first preset duration, control the first solenoid valve 10, the fifth solenoid valve 17, and the sixth solenoid valve 18 to conduct, control the first expansion valve 13 to be fully open, control the opening degree of the second expansion valve 14 to be the target defrosting opening degree, and control the outdoor fan to stop.

[0053] Step S7, after the compressor 5 has been running again for the first preset duration, control the compressor 5 to increase its frequency to the target defrosting frequency.

[0054] Exemplarily, after the air conditioner 100 enters defrosting, the compressor 5 reduces its frequency from the current operating frequency to the first target operating frequency. The first target operating frequency can be 30 Hz. After the compressor 5 has been running for the first preset duration, where the first preset duration can be 15 seconds, control the first solenoid valve 10, the fifth solenoid valve 17, and the sixth solenoid valve 18 to conduct, close the second solenoid valve 11, the third solenoid valve 12, the fourth solenoid valve 16, the seventh solenoid valve 19, and the third expansion valve 15, open the first expansion valve 13 to the maximum, control the opening degree of the second expansion valve 14 to be the target defrosting opening degree, and control the outdoor fan to stop. The compressor 5 runs again for the first preset duration, and control the compressor 5 to increase its frequency to the target defrosting frequency, where the target defrosting frequency is between 40 and 60 Hz. Thus, adaptively adjusting the frequency of the compressor according to the above conditions can ensure the stable operation of the compressor during defrosting.

[0055] When it is detected that the coil temperature of the first heat exchanger 2 ≥ 15 °C, the compressor 5 reduces its frequency from the target defrosting frequency to 30 Hz. After the compressor 5 has been running for 15 seconds, the first solenoid valve 10, the second solenoid valve 11, the fourth solenoid valve 16, the fifth solenoid valve 17, and the sixth solenoid valve 18 are closed, the third solenoid valve 12 and the seventh solenoid valve 19 are opened, the third expansion valve 15 is opened to the maximum, the first expansion valve 13 is opened to the initial number of steps at this ambient temperature, the second expansion valve 14 is closed. After the compressor 5 has been running for another 15 seconds, the compressor 5 increases to the target defrosting frequency, and after the target defrosting frequency is maintained for 3 minutes, normal frequency increase and decrease control is performed, and the outdoor fan speed is adjusted to the speed before defrosting and continues to run.

[0056] In addition, after the air conditioner 100 meets the defrosting conditions, the first expansion valve 13 is opened from the current number of steps to 500 steps, the third expansion valve 15 is closed to 0 steps, the second expansion valve 14 is opened from the current number of steps to the defrosting number of steps 350 steps. After defrosting, the first expansion valve 13 is opened to the initial number of steps, the third expansion valve 15 is opened to the maximum, and the second expansion valve 14 is closed from the current number of steps to 0 steps.

[0057] In some embodiments, in the first defrost mode, the controller is further configured to control the air conditioner 100 to exit the first defrost mode when the first defrost exit condition is met. The first defrost exit condition is that the coil temperature of the first heat exchanger 2 is higher than a preset temperature threshold or the defrost operation time reaches a second preset duration.

[0058] Wherein, the preset temperature threshold can be understood as the coil temperature value preset according to experiments for determining whether the frost layer on the first heat exchanger 2 has melted. The second preset duration can be understood as the defrost mode operation time for determining whether the frost layer on the first heat exchanger 2 has melted, and the second preset duration can be any value within the range of [30, 150].

[0059] Specifically, when the air conditioner 100 is operating in the first defrost mode, that is, the air conditioner 100 stops operating in the heating mode and then operates in the defrost mode. If it is detected that the first defrost exit condition is met, the air conditioner 100 is controlled to exit the first defrost mode. That is, when it is detected that the coil temperature of the first heat exchanger 2 is higher than the preset temperature threshold, it indicates that the frost layer on the first heat exchanger 2 has been melted at this time, and the air conditioner 100 is controlled to exit the first defrost mode. Or, the defrost operation time reaches the second preset duration, that is, the operation time of the air conditioner 100 in the first defrost mode reaches the second preset duration. At this time, it indicates that the operation time of the first defrost mode is sufficient to eliminate the frost layer on the first heat exchanger 2, and the air conditioner 100 is controlled to exit the first defrost mode. Thus, in this application, it is determined whether the air conditioner 100 can exit the first defrost mode through the coil temperature and the defrost operation time, so as to ensure that while effectively melting the frost layer, unnecessary energy consumption is avoided.

[0060] In addition, if the coil temperature of the first heat exchanger 2 is lower than the preset temperature threshold, or the defrost operation time does not reach the second preset duration, the air conditioner 100 is controlled to continue to execute the first defrost mode.

[0061] In some embodiments, in the second defrost mode, the controller is further configured to control the operating frequency of the compressor 5 to be a second target operating frequency greater than the target defrost frequency after determining that the defrost operation time reaches a fourth preset duration and the coil temperature of the first heat exchanger 2 is lower than the preset temperature threshold. The preset temperature threshold can be any value within the range of 10°C to 20°C.

[0062] Wherein, the fourth preset duration can be understood as the time preset according to experience when the heating capacity of the air conditioner 100 is insufficient to defrost. The fourth preset duration can be any value within the range of 5 min to 10 min, and the fourth preset duration can be 5 min, 8 min or 10 min, and no specific limitation is made thereto.

[0063] Specifically, when the compressor increases from 30 Hz to the target defrosting frequency of 60 Hz and the air conditioner 100 starts to operate the heating mode and the defrosting mode simultaneously, that is, in the second defrosting mode, if it is determined that the defrosting operation time reaches the fourth preset duration and the coil temperature of the first heat exchanger 2 is lower than the preset temperature threshold, that is, after the second defrosting mode has been operating for a period of time and the frost layer on the first heat exchanger 2 has not completely melted, it indicates at this time that the heating capacity of the air conditioner 100 is insufficient. Then, the operating frequency of the compressor 5 is controlled to be the second target operating frequency. Among them, the second target operating frequency can be the highest frequency. At this time, it is necessary to increase the frequency of the compressor 5 to the highest frequency to meet the requirements of simultaneous defrosting and heating. That is to say, by increasing the operating frequency of the compressor 5, the refrigerant flow rate in the pipeline is increased, thereby increasing the heating capacity of the air conditioner 100, and further increasing the coil temperature of the first heat exchanger 2 to make the coil temperature reach the preset temperature threshold and complete the defrosting process of the first heat exchanger 2. Thus, during the operation of the air conditioner 100 in the second defrosting mode, the heating capacity of the air conditioner 100 is determined through the defrosting operation time, and the operating frequency of the compressor 5 is adjusted through the heating capacity of the air conditioner 100 to increase the heating capacity of the air conditioner 100, thereby avoiding the problem that the first heat exchanger 2 cannot defrost quickly due to insufficient heating capacity of the air conditioner 100 and improving the defrosting speed.

[0064] In some embodiments, the controller is further configured to: when the second defrosting exit condition is met, control the air conditioner 100 to exit the second defrosting mode, where the second defrosting exit condition is that the coil temperature of the first heat exchanger 2 is higher than the preset temperature threshold.

[0065] Specifically, when the air conditioner 100 is operating in the second defrosting mode, that is, when the air conditioner 100 is operating the heating mode and the defrosting mode simultaneously, if it is detected that the second defrosting exit condition is met, control the air conditioner 100 to exit the second defrosting mode, that is, it is detected that the coil temperature of the first heat exchanger 2 is higher than the preset temperature threshold. At this time, it indicates that the frost layer on the first heat exchanger 2 has been melted, and control the air conditioner 100 to exit the second defrosting mode, and the air conditioner 100 continues to operate the heating mode. Thus, in this application, it is determined whether the air conditioner 100 can exit the second defrosting mode through the coil temperature, so as to ensure that while effectively melting the frost layer, unnecessary energy consumption is avoided.

[0066] Exemplarily, in the second defrosting mode, after controlling the operating frequency of the compressor 5 to be the second target operating frequency, until the coil temperature of the first heat exchanger 2 is higher than the preset temperature threshold, the second defrosting mode is exited and the next heating operation is restarted.

[0067] In some embodiments, the controller is further configured to: when it is determined that the temperature difference between the coil temperature of the first heat exchanger 2 and the outdoor ambient temperature is within the frosting temperature range and the operating duration of the air conditioner 100 reaches the first preset duration, control the air conditioner 100 to enter the defrosting mode.

[0068] Among them, the first preset duration can be understood as the operating duration of the air conditioner 100 set according to experiments for determining whether the first heat exchanger 2 is frosted. The first preset duration can be any value within the range of 20 min to 150 min. The first preset duration can be 20 min, 50 min, 90 min, 100 min, 140 min, or 150 min, and no specific limitation is made thereto.

[0069] Specifically, since the first heat exchanger 2 is located outdoors, when the air conditioner 100 operates in the heating mode, the first heat exchanger 2 absorbs the heat of the outdoor environment, resulting in a sharp drop in the outdoor environmental temperature. If the air conditioner 100 operates for a long time, it will cause the first heat exchanger 2 to frost. Based on this, in this application, it is determined whether the first heat exchanger 2 is frosted by whether the temperature difference between the coil temperature of the first heat exchanger 2 and the outdoor environmental temperature is within the frosting temperature range, and by setting the first preset duration. That is to say, when it is determined that the temperature difference between the coil temperature of the first heat exchanger 2 and the outdoor environmental temperature is within the frosting temperature range, it indicates that the coil temperature of the first heat exchanger 2 and the outdoor environmental temperature are very low and it is easy to cause the first heat exchanger 2 to frost. And when it is determined that the operating duration of the air conditioner 100 reaches the first preset duration, it indicates that the air conditioner 100 operating in the heating mode for a long time will cause the first heat exchanger 2 to frost, then the air conditioner 100 is controlled to enter the defrosting mode to defrost the first heat exchanger 2. Thus, in this application, it is determined whether the first heat exchanger 2 is frosted by the temperature difference between the coil temperature of the first heat exchanger 2 and the outdoor environmental temperature and the operating duration of the air conditioner 100, so as to control the air conditioner 100 to operate in the defrosting mode after it is determined that the first heat exchanger 2 is frosted, so that the air conditioner 100 can defrost the first heat exchanger 2 in time.

[0070] Exemplarily, the frosting temperature range is -10°C to -4°C, and the first preset duration is 20 min. After the air conditioner 100 is turned on and operates in the heating mode, after the air conditioner 100 operates for a period of time, it is detected whether the air conditioner 100 meets the defrosting condition. That is to say, if it is detected that the temperature difference between the coil temperature of the first heat exchanger 2 and the outdoor environmental temperature is within -10 to -4°C, and the operating duration of the air conditioner 100 reaches 20 min, that is, the operating duration of the air conditioner 100 in the heating mode reaches 20 min, then the air conditioner 100 is controlled to enter the defrosting mode. If it does not meet the condition, it continues to operate in the heating mode.

[0071] In some embodiments, the air conditioner 100 further includes a water pump (the first water pump 20). The water pump is disposed on the connecting pipeline between the second heat exchanger 3 and the water tank 1 to provide power for the water flow between the second heat exchanger and the water tank, and heat the water to produce domestic hot water. The controller is further configured to: in the defrosting mode, control the water pump to operate at the maximum speed. That is to say, when the air conditioner 100 is in the defrosting mode, control the water pump to operate at the maximum speed to provide the maximum power for the water flow between the second heat exchanger 3 and the water tank 1, so as to accelerate the absorption of the heat of the domestic hot water.

[0072] In an embodiment, the air conditioner 100 further includes a second water pump 21 to deliver cold water and hot water to the user, so as to reduce or increase the temperature of the user's room.

[0073] In addition, after the air conditioner 100 exits the defrosting mode, control the water pump to close.

[0074] The following refers to Figure 9 Describe the control process of the first defrosting mode of the embodiments of the present invention, and the specific content is as follows.

[0075] Step S8, start.

[0076] Step S9, determine whether the operating mode of the air conditioner is the heating mode. If so, execute step S12; otherwise, execute step S10.

[0077] Step S10, determine whether the operating mode of the air conditioner is the hot water production mode. If so, execute step S12; otherwise, execute step S11.

[0078] Step S11, if the air conditioner is not frosted, there is no need to execute the first defrosting mode.

[0079] Step S12, determine whether the operating environment temperature of the air conditioner is less than 4°C. If so, execute step S13 and step S14; otherwise, execute step S11.

[0080] Step S13, determine whether the coil temperature of the first heat exchanger is lower than the preset temperature threshold. If so, execute step S15; otherwise, re-judge step S13.

[0081] Step S14, determine whether the operating duration of the air conditioner reaches the first preset duration. If so, execute step S15; otherwise, re-judge step S14.

[0082] Step S15, the air conditioner needs to defrost.

[0083] Step S16, determine whether the domestic water temperature is higher than the first preset temperature. If so, execute step S18; otherwise, execute step S17.

[0084] Step S17, the air conditioner is not allowed to defrost using the heat of the water tank.

[0085] Step S18, the air conditioner allows defrosting using the heat of the water tank.

[0086] Step S19, determine whether the coil temperature of the first heat exchanger is higher than a preset temperature threshold. If so, execute Step S21; otherwise, execute Step S20.

[0087] Step S20, determine whether the defrosting operation time reaches a second preset duration. If so, execute Step S21; otherwise, execute Step S18.

[0088] Step S21, the air conditioner exits the first defrosting mode.

[0089] Step S22, end.

[0090] The following refers to Figure 10 Describe the control process of the second defrosting mode of the embodiments of the present invention, and the specific content is as follows.

[0091] Step S23, start.

[0092] Step S24, the air conditioner operates in the heating mode.

[0093] Step S25, input the coil temperature of the first heat exchanger.

[0094] Step S26, input the operating duration of the air conditioner.

[0095] Step S27, determine whether the coil temperature of the first heat exchanger and the operating duration of the air conditioner meet the defrosting mode conditions, that is, determine whether the temperature difference between the coil temperature of the first heat exchanger and the outdoor ambient temperature is within the frosting temperature range, and determine whether the operating duration of the air conditioner reaches a first preset duration. If so, execute Step S28; otherwise, execute Step S24.

[0096] Step S28, the compressor frequency is reduced to the first target operating frequency.

[0097] Step S29, control the conduction condition of the solenoid valve.

[0098] Step S30, control the conduction condition of the expansion valve.

[0099] Step S31, control the outdoor fan to stop.

[0100] Step S32, control the compressor to increase the frequency to the target defrosting frequency.

[0101] Step S33, determine whether the coil temperature of the first heat exchanger is higher than a preset temperature threshold. If so, execute Step S36; otherwise, execute Step S34.

[0102] Step S34, determine whether the defrosting operation time reaches a fourth preset duration. If so, execute Step S35; otherwise, execute Step S33.

[0103] Step S35: Control the compressor to increase its frequency to the second target operating frequency.

[0104] Step S36: Control the air conditioner to exit the second defrosting mode.

[0105] Step S37: End.

[0106] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0107] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A water tank, wherein the water tank is used to store domestic water; A first heat exchanger, which is located outdoors and is used to exchange heat for the circulating refrigerant; A second heat exchanger, the second heat exchanger is connected to the water tank and is used to exchange heat for the domestic water; A third heat exchanger, the third heat exchanger is located indoors and is used to adjust the indoor temperature; a compressor having an exhaust port and an intake port; A first pipeline, a second pipeline and a third pipeline, wherein the head end of the first pipeline and the head end of the second pipeline are both used to connect to the exhaust port, the end of the first pipeline and the end of the second pipeline are both used to connect to the head end of the third pipeline, the end of the third pipeline is used to connect to the exhaust port, the first heat exchanger is located on the first pipeline, the second heat exchanger is located on the second pipeline, and the third heat exchanger is located on the third pipeline; A control valve, the control valve is arranged between the exhaust port and the head end of the first pipeline, the head end of the second pipeline, the end of the third pipeline, and the air inlet, and the control valve is used to change the flow direction of the refrigerant discharged from the exhaust port; A controller is connected to the control valve, and the controller is configured to: In the defrost mode, determining that the domestic water temperature is higher than a first preset temperature; The conductance of the control valve is controlled to guide the refrigerant discharged from the exhaust port to enter the air inlet through the first pipeline and the second pipeline in sequence.

2. The air conditioner according to claim 1, characterized in that: The air conditioner further comprises a first expansion valve, a second expansion valve and a third expansion valve, wherein the first expansion valve is arranged on the first pipeline, the second expansion valve is arranged on the second pipeline, and the third expansion valve is arranged on the third pipeline; The control valve includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve, a fifth solenoid valve, a sixth solenoid valve and a seventh solenoid valve, the first solenoid valve is arranged between the exhaust port and the first end of the sixth solenoid valve, the second solenoid valve is arranged between the exhaust port and the head end of the second pipeline, the second solenoid valve is arranged between the exhaust port and the end of the third pipeline, the first end of the fourth solenoid valve is connected to the third solenoid valve and the end of the third pipeline, the second end of the fourth solenoid valve is connected to the first end of the fifth solenoid valve, the first end of the seventh solenoid valve and the air inlet, and the second end of the sixth solenoid valve is connected to the head end of the first pipeline and the second end of the seventh solenoid valve.

3. The air conditioner according to claim 2, characterized in that: For controlling the conduction of the control valve to guide the refrigerant discharged from the exhaust port to enter the air inlet through the first pipeline and the second pipeline in sequence, the controller is specifically configured as follows: Controlling conduction between the first expansion valve and the second expansion valve; The first solenoid valve, the fifth solenoid valve and the sixth solenoid valve are controlled to be turned on, and the second solenoid valve, the fourth solenoid valve and the seventh solenoid valve are controlled to be closed, so as to guide the refrigerant discharged from the exhaust port to enter the air inlet through the first pipeline and the second pipeline in sequence.

4. The air conditioner according to claim 3, characterized in that: The defrost mode includes a first defrost mode and a second defrost mode, wherein the third expansion valve and the third solenoid valve are controlled to be closed in the first defrost mode, and the third expansion valve and the third solenoid valve are controlled to be turned on in the second defrost mode.

5. The air conditioner according to claim 3 or 4, characterized in that: The controller is also configured to: In the defrost mode, controlling the compressor to reduce the frequency to a first target operating frequency; After the compressor maintains running for a first preset time, the first solenoid valve, the fifth solenoid valve and the sixth solenoid valve are controlled to be turned on, the first expansion valve is controlled to be fully opened, the opening degree of the second expansion valve is controlled to be a target defrosting opening degree, and the outdoor fan is controlled to stop; After the compressor runs again for the first preset time, the compressor is controlled to increase the frequency to the target defrosting frequency.

6. The air conditioner according to claim 4, characterized in that: In the first defrost mode, the controller is further configured to: When a first defrost exit condition is met, the air conditioner is controlled to exit the first defrost mode, wherein the first defrost exit condition is that the coil temperature of the first heat exchanger is higher than a preset temperature threshold or the defrost operation time reaches a second preset time.

7. The air conditioner according to claim 5, characterized in that: In the second defrost mode, the controller is further configured to: After determining that the defrost operation time reaches a fourth preset time length and the coil temperature of the first heat exchanger is lower than a preset temperature threshold, the operating frequency of the compressor is controlled to be a second target operating frequency, and the second target operating frequency is greater than the target defrost frequency.

8. The air conditioner according to claim 7, characterized in that: The controller is also configured to: When a second defrost exit condition is met, the air conditioner is controlled to exit the second defrost mode, wherein the second defrost exit condition is that the coil temperature of the first heat exchanger is higher than a preset temperature threshold.

9. The air conditioner according to any one of claims 1 to 8, characterized in that: The controller is also configured to: When it is determined that the temperature difference between the coil temperature of the first heat exchanger and the outdoor ambient temperature is within the frosting temperature range and the operation time of the air conditioner reaches a first preset time, the air conditioner is controlled to enter the defrosting mode.

10. The air conditioner according to claim 9, characterized in that: The air conditioner further includes a water pump, which is disposed on a connecting pipeline between the second heat exchanger and the water tank. The controller is further configured as follows: In the defrost mode, the water pump is controlled to operate at a maximum speed.

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