Air conditioner

Abstract

The invention provides an air conditioner which comprises a refrigeration cycle system, and the refrigeration cycle system comprises a compressor, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger which are sequentially connected through a refrigerant pipeline; one end of the defrosting bypass is connected to the refrigerant outflow end of the indoor heat exchanger, and the other end of the defrosting bypass is connected to the refrigerant inflow end of the expansion valve; a part of the defrosting bypass is arranged close to the compressor, and a refrigerant in the defrosting bypass is heated by the compressor and then flows to the outdoor heat exchanger so as to defrost the outdoor heat exchanger. The air conditioner is provided with the defrosting bypass, the low-temperature refrigerant in the defrosting bypass is heated through the high-temperature shell of the compressor, and then the purpose of defrosting of the outdoor heat exchanger is achieved.

Description

Technical Field

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

[0002] In winter, the outdoor temperature is low, and the air conditioner is running for heating in a low temperature environment. Frost will form outside the air conditioner, affecting the use of the air conditioner, reducing the heating efficiency of the air conditioner, and affecting the use and comfort of the air conditioner.

[0003] When the air conditioner is used in the heating season, the outdoor unit will be frosted and need to be defrosted. When a traditional air conditioner is defrosted, the indoor unit fan stops supplying air and the indoor temperature begins to drop, affecting the user experience.

[0004] The existing air conditioner defrosting method is that the outdoor unit refrigeration flow path runs, and the indoor unit fan stops rotating. At this time, the indoor temperature begins to drop, and the user feels the ambient temperature is getting colder. The indoor unit is stopped to perform the outdoor unit defrosting operation, which seriously affects the user experience.

[0005] There are two existing technologies for air conditioner defrosting. The first is to switch the outdoor unit to the refrigeration flow path for outdoor unit defrosting, and stop the indoor unit fan to prevent the indoor unit from blowing cold air. This method will cause the indoor temperature to drop and affect the user experience. The second is to add a bypass heat exchanger to the outdoor unit. When the outdoor unit is frosted, the bypass heat exchanger is used to increase the outdoor heat exchange effect for defrosting. This method increases the cost of the outdoor unit and the price increase of the air conditioner is relatively high.

[0006] The defrosting method of the air conditioner in the prior art mainly controls the air conditioner to stop heating operation through the control system after the thickness of the frost layer reaches a certain level, adjusts the working state of the four-way valve in the air conditioner, and makes the air conditioner operate in the cooling state for a short time, so that the refrigerant with a higher temperature flows through the outdoor heat exchanger, increases the surface temperature of the heat transfer surface of the outdoor heat exchanger, and melts the frost layer; after the frost layer melts, it switches back to heating operation. The defrosting process is actually a cooling process, and the heat exchanger of the outdoor unit of the air conditioner will absorb enough heat from the indoor side to defrost. Summary of the invention

[0007] An object of the present invention is to provide an air conditioner which can at least solve any of the above problems.

[0008] A further object of the present invention is to defrost the outdoor heat exchanger while ensuring user experience.

[0009] In particular, the present invention provides an air conditioner, the air conditioner comprising:

[0010] A refrigeration cycle system, comprising a compressor, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger connected in sequence by a refrigerant pipeline;

[0011] A defrost bypass, one end of which is connected to the refrigerant outflow end of the indoor heat exchanger, and the other end is connected to the refrigerant inflow end of the expansion valve;

[0012] A partial defrost bypass is provided close to the compressor, and the refrigerant in the defrost bypass is heated by the compressor and then flows to the outdoor heat exchanger to defrost the outdoor heat exchanger.

[0013] Furthermore, the air conditioner also includes:

[0014] The control valve group is used to control the flow of refrigerant in the defrost bypass and refrigeration cycle system.

[0015] Furthermore, the control valve group includes:

[0016] A first control valve is disposed in the defrost bypass and is located upstream of a portion of the defrost bypass, and is used to control the flow of refrigerant in the defrost bypass;

[0017] The second control valve is arranged in the refrigeration cycle system and is located downstream of the indoor heat exchanger and upstream of the expansion valve. The second control valve is connected in parallel with the defrost bypass and is used to control the refrigerant flow of the refrigeration cycle system.

[0018] Furthermore, the air conditioner also includes:

[0019] The defrost temperature sensor is installed on the outdoor heat exchanger and is used to detect the coil temperature of the outdoor heat exchanger.

[0020] Further, the first control valve is configured to open when the coil temperature of the outdoor heat exchanger is lower than or equal to a first preset temperature; the second control valve is configured to close when the coil temperature of the outdoor heat exchanger is lower than or equal to the first preset temperature.

[0021] Further, the first control valve is configured to close when the coil temperature of the outdoor heat exchanger is higher than or equal to a second preset temperature; the second control valve is configured to close when the coil temperature of the outdoor heat exchanger is higher than or equal to the second preset temperature.

[0022] Furthermore, the air conditioner also includes:

[0023] An indoor fan, used for causing a heat exchange airflow to be formed for exchanging heat with an indoor heat exchanger;

[0024] The outdoor fan is used to promote the formation of heat exchange airflow for exchanging heat with the outdoor heat exchanger.

[0025] Further, the outdoor fan is configured to increase the rotation speed when the coil temperature is higher than a first preset temperature.

[0026] Further, the indoor fan is configured to reduce the speed of the outdoor fan if the coil temperature does not increase after the outdoor fan increases the speed of the indoor fan.

[0027] Further, the compressor is configured to reduce the frequency after the indoor fan reduces the speed if the coil temperature does not increase.

[0028] The air conditioner of the present invention includes a refrigeration cycle system and a defrost bypass. The refrigeration cycle system includes a compressor, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger connected in sequence by a refrigerant pipeline. One end of the defrost bypass is connected to the refrigerant outflow end of the indoor heat exchanger, and the other end is connected to the refrigerant inflow end of the expansion valve. Part of the defrost bypass is arranged close to the compressor, and the refrigerant in the defrost bypass is heated by the compressor and then flows to the outdoor heat exchanger to defrost the outdoor heat exchanger. The air conditioner of the present invention is provided with a defrost bypass, and the low-temperature refrigerant in the defrost bypass is heated by the high-temperature housing of the compressor, thereby achieving the purpose of defrosting the outdoor heat exchanger.

[0029] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0031] Figure 1 is a schematic block diagram of an air conditioner according to an embodiment of the present invention;

[0032] Figure 2 is a schematic diagram of an air conditioner according to an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of a refrigeration cycle system of an air conditioner according to an embodiment of the present invention;

[0034] Figure 4 is a step diagram of a method for controlling an air conditioner according to an embodiment of the present invention;

[0035] Figure 5 is a schematic block diagram of a control device for an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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, and therefore should not be understood as a limitation on the present application.

[0038] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0039] Reference below Figures 1 to 3 The air conditioner 01 in some embodiments of the present invention is described in detail. Figure 1 is a schematic block diagram of an air conditioner 01 according to an embodiment of the present invention. Figure 2 is a schematic diagram of an air conditioner 01 according to an embodiment of the present invention. Figure 3 01 is a schematic diagram of a refrigeration cycle system of an air conditioner 01 according to an embodiment of the present invention.

[0040] It should be noted that, for the convenience of description and to enable those skilled in the art to quickly understand the technical solution of the present invention, the following text only describes the technical features that are strongly related (directly or indirectly related) to the technical problem and / or technical concept to be solved by the present invention, and does not describe the technical features that are weakly related to the technical problem and / or technical concept to be solved by the invention. Since the technical features with a weaker degree of correlation belong to the common knowledge in the field, even if the present invention does not describe the features with a weaker degree of correlation, it will not lead to insufficient disclosure of the present invention.

[0041] The air conditioner 01 of this embodiment may generally include an indoor unit 10 and an outdoor unit 20. The indoor unit 10 may include an indoor unit casing, an indoor unit frame, an indoor heat exchanger 200 and an indoor fan 101. The outdoor unit 20 may include an outdoor unit casing, an outdoor unit frame, an outdoor heat exchanger 300 and an outdoor fan 201. The air conditioner 01 of this embodiment also includes a refrigeration cycle system and a defrost bypass 600. The refrigeration cycle system includes a compressor 100, an indoor heat exchanger 200, an expansion valve 400 and an outdoor heat exchanger 300 connected in sequence by a refrigerant pipeline.

[0042] The refrigeration cycle system consists of a refrigerant and four major components, namely a compressor 100, a condenser, an expansion valve 400, and an evaporator. The refrigeration cycle system of this embodiment is a compression refrigeration system. The compression refrigeration system releases cold energy through the refrigerant compression cycle.

[0043] The compression refrigeration system generally has four major components, namely, the compressor 100, the condenser, the throttling device 400 and the evaporator. The throttling device 400 can be an expansion valve 400. The evaporator and the condenser both directly or indirectly exchange heat with the ambient air. When the air conditioner 01 is in the cooling mode, the indoor heat exchanger 200 is used as the evaporator and the outdoor heat exchanger 300 is used as the condenser. When the air conditioner 01 is in the heating mode, the indoor heat exchanger 200 is used as the condenser and the outdoor heat exchanger 300 is used as the evaporator. The expansion valve 400 can be an electronic expansion valve.

[0044] The working principle of the refrigeration cycle system is as follows: the compressor 100, as the power of the refrigeration cycle, is driven by an electric motor and rotates continuously, extracting the steam in the evaporator, and increasing the pressure and temperature of the refrigerant steam through compression, creating conditions for transferring the heat of the refrigerant steam to the external environment medium, that is, compressing the low-temperature and low-pressure refrigerant steam to a high-temperature and high-pressure state.

[0045] An exhaust end temperature sensor 110 is provided at the exhaust end of the compressor 100 of the air conditioner 01 of the present embodiment, and an intake end temperature sensor 120 is provided at the intake end of the compressor 100 .

[0046] The condenser is a heat exchange device that uses the environment to cool the refrigerant, takes away the heat of the high-temperature and high-pressure refrigerant vapor from the compressor 100, and cools and condenses the high-temperature and high-pressure refrigerant vapor into a high-pressure and room-temperature refrigerant liquid.

[0047] The high-temperature and high-pressure refrigerant liquid passes through the expansion valve 400 to obtain low-temperature and low-pressure refrigerant, which is then sent to the evaporator to absorb heat and evaporate. According to the corresponding principle of saturation pressure and saturation temperature, reducing the pressure of the refrigerant liquid can reduce the temperature of the refrigerant liquid.

[0048] The evaporator is another heat exchange device, in which the throttled low-temperature and low-pressure refrigerant liquid evaporates (boils) into steam, absorbs ambient heat, and reduces the ambient temperature to achieve the purpose of refrigeration. The indoor heat exchanger 200 in this embodiment is provided with an indoor heat exchanger coil temperature sensor 210 and an indoor ambient temperature sensor 220.

[0049] In this embodiment, the refrigeration cycle system can be implemented using a compression refrigeration cycle. The compression refrigeration cycle uses the compression phase change cycle of the refrigerant in the compressor 100, the condenser, the evaporator, and the throttling device 400 to achieve heat transfer. In the air conditioner 01, the refrigeration system can also be provided with a reversing valve 700 to change the flow direction of the refrigerant so that the indoor heat exchanger 200 alternately serves as an evaporator and a condenser to achieve a cooling or heating function. Since the compression refrigeration cycle in the air conditioner 01 is well known to those skilled in the art, its working principle and structure are not repeated again. In this embodiment, the compressor 100 uses a variable frequency compressor, and the throttling device 400 can use an electronic expansion valve 400 with an adjustable opening.

[0050] The air conditioner 01 of this embodiment may further include an air pipe stop valve 800. The air pipe stop valve 800 is arranged in the refrigeration cycle system. When the air conditioner 01 is in the cooling mode, the indoor heat exchanger 200 is used as an evaporator, and the outdoor heat exchanger 300 is used as a condenser. At this time, the air pipe stop valve 800 is arranged upstream of the condenser. When the air conditioner 01 is in the heating mode, the indoor heat exchanger 200 is used as a condenser, and the outdoor heat exchanger 300 is used as an evaporator. At this time, the air pipe stop valve 800 is arranged downstream of the evaporator.

[0051] The air conditioner 01 of this embodiment may further include a liquid pipe stop valve 900. The liquid pipe stop valve 900 is arranged in the refrigeration cycle system. The liquid pipe stop valve 900 is arranged downstream of the condenser and upstream of the evaporator.

[0052] The air conditioner 01 of this embodiment may further include a reversing valve 700. The reversing valve 700 may change the flow direction of the refrigerant so that the indoor heat exchanger 200 alternately serves as an evaporator and a condenser to achieve a cooling function or a heating function. In some embodiments, the reversing valve 700 may be configured as a four-way valve.

[0053] The air conditioner 01 of this embodiment may further include a defrost bypass 600. One end of the defrost bypass 600 is connected to the refrigerant outflow end of the indoor heat exchanger 200, and the other end is connected to the refrigerant inflow end of the expansion valve 400. Part of the defrost bypass 600 is arranged close to the compressor 100, and the refrigerant in the defrost bypass 600 is heated by the compressor 100 and flows to the outdoor heat exchanger 300 to defrost the outdoor heat exchanger 300.

[0054] Part of the pipeline of the defrost bypass 600 can be arranged near the compressor 100. In some embodiments, part of the pipeline of the defrost bypass 600 can be arranged around the periphery of the compressor 100. In other embodiments, part of the pipeline of the defrost bypass 600 can be arranged in a coiled manner near the compressor 100 to increase the heated area. A plurality of fins can also be arranged on the part of the pipeline to increase the heat exchange area. In some other embodiments, the defrost bypass 600 is arranged in an S shape below the compressor to increase the heat exchange area.

[0055] In this embodiment, the refrigeration cycle system includes a reversing valve 700, an air pipe stop valve 800, a liquid pipe stop valve 900, a compressor 100, an outdoor heat exchanger 300, an indoor heat exchanger 200, an expansion valve 400, and a defrost bypass 600. When the air conditioner 01 is in heating mode, the refrigerant flows out from the discharge end of the compressor 100, then flows into the indoor heat exchanger 200 through the air flow stop valve, and then flows into the defrost bypass 600 through the liquid pipe stop valve 900. The refrigerant in the defrost bypass 600 can be heated by the compressor 100, and the heated refrigerant will flow into the outdoor heat exchanger 300, and the outdoor heat exchanger 300 can be defrosted.

[0056] The air conditioner 01 of this embodiment further includes a control valve group 500 . The control valve group 500 is used to control the refrigerant flow in the defrost bypass 600 and the refrigeration cycle system. The control valve group 500 includes a first control valve 510 and a second control valve 520 .

[0057] The first control valve 510 is disposed in the defrost bypass 600 and is located upstream of a portion of the defrost bypass 600, and is used to control the refrigerant flow in the defrost bypass 600. The second control valve 520 is disposed in the refrigeration cycle system and is located downstream of the indoor heat exchanger 200 and upstream of the expansion valve 400. The second control valve 520 is connected in parallel with the defrost bypass 600 and is used to control the refrigerant flow of the refrigeration cycle system.

[0058] The air conditioner 01 of this embodiment adds a defrost bypass 600 to the refrigeration cycle system and adds a control valve group 500. For the heating environment, the flow direction of the refrigerant in the refrigerant pipeline can be controlled by controlling the opening and closing of the first control valve 510 and the second control valve 520. When the first control valve 510 is opened and the second control valve 520 is closed, the refrigerant through the liquid pipe stop valve 900 flows to the first control valve 510, passes through the pipeline around the compressor 100, is heated by the high-temperature outer shell of the compressor 100, and then enters the outdoor heat exchanger 300 through the electronic expansion valve 400 to achieve the purpose of defrosting.

[0059] The air conditioner 01 of this embodiment further includes a defrost temperature sensor 310. The defrost temperature sensor 310 is disposed on the outdoor heat exchanger 300 and is used to detect the coil temperature of the outdoor heat exchanger 300. The outdoor heat exchanger 300 may include a coil and a fin. In some embodiments, the defrost temperature sensor 310 may be disposed on the coil. In other embodiments, the defrost temperature sensor 310 may be disposed on the fin.

[0060] The first control valve 510 of the air conditioner 01 of this embodiment is configured to open when the coil temperature of the outdoor heat exchanger 300 is lower than or equal to the first preset temperature. The second control valve 520 is configured to close when the coil temperature of the outdoor heat exchanger 300 is lower than or equal to the first preset temperature. The first preset temperature can be set to -5°C to 0°C. In a preferred embodiment, the first preset temperature can be set to -3°C. When the temperature is lower than the first preset temperature, it is determined that the defrosting environment is a severe heating environment.

[0061] The first control valve 510 of the air conditioner 01 of this embodiment is also configured to close when the coil temperature of the outdoor heat exchanger 300 is higher than or equal to the second preset temperature. The second control valve 520 is also configured to open when the coil temperature of the outdoor heat exchanger 300 is higher than or equal to the second preset temperature. The second preset temperature can be set to 1°C-5°C. In some preferred embodiments, the second preset temperature can be set to 3°C.

[0062] When the temperature is lower than -3°C, the first control valve 510 is opened and the second control valve 520 is closed, and the refrigerant in the defrost bypass 600 is heated and flows into the outdoor heat exchanger 300, thereby achieving the purpose of defrosting. At this time, the detection temperature of the defrost temperature sensor 310 is continuously obtained. When the coil temperature reaches 3°C, the first control valve 510 is closed and the second control valve 520 is opened to prevent the refrigerant from flowing into the defrost bypass 600.

[0063] The air conditioner 01 of this embodiment further includes an indoor fan 101 and an outdoor fan 201. The indoor fan 101 is used to promote the formation of a heat exchange airflow for heat exchange with the indoor heat exchanger 200. The outdoor fan 201 is used to promote the formation of a heat exchange airflow for heat exchange with the outdoor heat exchanger 300. The indoor unit 10 is configured to increase the speed when the coil temperature is higher than the first preset temperature. The indoor fan 101 is configured to reduce the speed if the coil temperature does not increase after the outdoor fan 201 increases the speed. The compressor 100 is configured to reduce the frequency if the coil temperature does not increase after the indoor fan 101 reduces the speed.

[0064] The air conditioner 01 of this embodiment includes a refrigeration cycle system and a defrost bypass 600. The refrigeration cycle system includes a compressor 100, an indoor heat exchanger 200, an expansion valve 400 and an outdoor heat exchanger 300 connected in sequence by a refrigerant pipeline. One end of the defrost bypass 600 is connected to the refrigerant outflow end of the indoor heat exchanger 200, and the other end is connected to the refrigerant inflow end of the expansion valve 400. Part of the defrost bypass 600 is arranged close to the compressor 100, and the refrigerant in the defrost bypass 600 is heated by the compressor 100 and flows to the outdoor heat exchanger 300 to defrost the outdoor heat exchanger 300. The air conditioner 01 of the present invention is provided with a defrost bypass 600, and the low-temperature refrigerant in the defrost bypass 600 is heated by the high-temperature housing of the compressor 100, thereby achieving the purpose of defrosting the outdoor heat exchanger 300.

[0065] The air conditioner 01 of this embodiment can realize two defrosting solutions. The first one is that in a normal heating environment, when the air conditioner 01 is in heating operation, the frost condition of the indoor heat exchanger 200 is monitored. When the frost condition of the outdoor heat exchanger 300 is serious and reaches the critical value requiring defrosting, the parameters of the indoor unit 10 and the outdoor unit 20 are controlled, and the outdoor heat exchanger 300 is defrosted under the premise of ensuring user experience. The second one is that in a harsh heating environment, a control valve group 500 is added to the liquid pipe stop valve 900 of the outdoor unit 20. When the outdoor heat exchanger 300 is defrosted, the control valve group 500 is opened to guide the refrigerant to the vicinity of the compressor 100, and the low-temperature refrigerant is heated by the high-temperature shell of the compressor 100, thereby achieving the purpose of defrosting the outdoor heat exchanger 300.

[0066] Figure 4 FIG. 1 is a step diagram of a method for controlling an air conditioner according to an embodiment of the present invention. Figure 4 As shown, the control method of the air conditioner 01 of this embodiment includes:

[0067] Step S402, obtaining an air conditioning heating operation signal.

[0068] Step S404, determine whether the coil temperature is lower than or equal to the first preset temperature. The first preset temperature can be set to -5°C-0°C. In a preferred embodiment, the first preset temperature can be set to -3°C. If yes, execute step S422. If no, execute step S406.

[0069] Step S406, determining that the heating environment is a normal heating environment.

[0070] Step S408: The speed of the outdoor fan 201 is increased by one gear. The speed of the outdoor fan 201 can be set to multiple gears. For example, the speed of the outdoor fan 201 can be set to three gears.

[0071] Step S410, detect the coil temperature and determine whether the coil temperature rises. That is, determine whether step S408 has successfully achieved defrosting. If not, execute step S412. If yes, execute step S420, maintain the speed of the outdoor fan 201 until the coil temperature is greater than or equal to the second preset temperature. The second preset temperature can be set to 1°C-5°C. In a preferred embodiment, the first preset temperature can be set to 3°C.

[0072] Step S412, the speed of the indoor fan is reduced by one gear. The speed of the indoor fan 101 can be set to multiple gears. For example, the speed of the indoor fan 101 can be set to three gears.

[0073] Step S414, detect the coil temperature and determine whether the coil temperature rises. That is, determine whether step S412 has successfully achieved defrosting. If not, execute step S416. If yes, execute step S420, maintain the speed of the outdoor fan 201 until the coil temperature is higher than or equal to the second preset temperature.

[0074] Step S416, reducing the frequency of the compressor 100. In some embodiments, the frequency of the compressor 100 is reduced by 2 Hz. In some other embodiments, the frequency of the compressor 100 is reduced by 1 Hz.

[0075] Step S418, detect the coil temperature and determine whether the coil temperature rises. That is, determine whether step S416 has successfully achieved defrosting. If not, execute step S422. If yes, execute step S420, maintain the speed of the outdoor fan 201 until the coil temperature is higher than or equal to the second preset temperature.

[0076] Step S422, determining that the heating environment is a severe heating environment.

[0077] Step S424, open the first control valve 510 and close the second control valve 520.

[0078] Step S426, detect the coil temperature and determine whether the coil temperature rises. That is, determine whether step S424 has successfully achieved defrosting. If not, execute step S424, and keep the first control valve 510 open and the second control valve 520 closed. If yes, execute step S420, and keep the speed of the outdoor fan 201 until the coil temperature is higher than or equal to the second preset temperature.

[0079] In the heating operation state, the coil temperature of the outdoor heat exchanger 300 is detected, and the heating environment is divided into a normal heating environment and a severe heating environment according to whether the coil temperature is less than or equal to -3°C. For the normal heating environment, the control method sequence is to increase the speed of the outdoor fan 201 by one gear, reduce the speed of the indoor fan 101 by one gear, and reduce the frequency of the compressor 100 by 2Hz. If the above measures cannot increase the coil temperature, the current environment is determined to be a severe heating environment. For the severe heating environment, the first control valve 510 is directly opened, and the second control valve 520 is closed. The refrigerant in the refrigerant pipeline is heated by the high temperature of the compressor 100 shell, thereby achieving the purpose of defrosting the outdoor heat exchanger 300.

[0080] The air conditioner 01 of this embodiment can realize two defrosting solutions. The first one is that in a normal heating environment, when the air conditioner 01 is in heating operation, the frost condition of the indoor heat exchanger 200 is monitored. When the frost condition of the outdoor heat exchanger 300 is serious and reaches the critical value requiring defrosting, the parameters of the indoor unit and the outdoor unit 20 are controlled, and the outdoor heat exchanger 300 is defrosted under the premise of ensuring user experience. The second one is that in a harsh heating environment, a control valve group 500 is added to the liquid pipe stop valve 900 of the outdoor unit 20. When the outdoor heat exchanger 300 is defrosted, the control valve group 500 is opened to guide the refrigerant to the vicinity of the compressor 100, and the low-temperature refrigerant is heated by the high-temperature shell of the compressor 100, thereby achieving the purpose of defrosting the outdoor heat exchanger 300.

[0081] Figure 5 FIG. 1 is a schematic block diagram of a control device for an air conditioner according to an embodiment of the present invention. Figure 5 As shown, the air conditioner 01 of this embodiment further includes a control device 1000. The control device 1000 can be used to execute the control method of the air conditioner 01 of this embodiment.

[0082] The controller includes a processor 1010 and a memory 1020. The processor 1010 stores a control program 1021. When the control program 1021 is executed by the processor 1010, it is used to implement the control method of the air conditioner 01 of this embodiment.

[0083] The memory 1020 may be a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviated: RAM); the memory 1020 may also be a non-volatile memory (English: non-volatile memory), such as a read-only memory (English: read-only memory, abbreviated: ROM), a flash memory (English: flash memory), a hard disk drive (English: hard disk drive, abbreviated: HDD) or a solid-state drive (English: solid-state drive, abbreviated: SSD), or the memory 1020 is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 1020 may be a combination of the above memories 1020.

[0084] The processor 1010 is used to execute the program code stored in the memory 1020, specifically to execute the above Figure 4 The control method of the air conditioner 01 of the corresponding embodiment.

[0085] The air conditioner 01 of this embodiment includes a refrigeration cycle system and a defrost bypass 600. The refrigeration cycle system includes a compressor 100, an indoor heat exchanger 200, an expansion valve 400 and an outdoor heat exchanger 300 connected in sequence by a refrigerant pipeline. One end of the defrost bypass 600 is connected to the refrigerant outflow end of the indoor heat exchanger 200, and the other end is connected to the refrigerant inflow end of the expansion valve 400. Part of the defrost bypass 600 is arranged close to the compressor 100, and the refrigerant in the defrost bypass 600 is heated by the compressor 100 and flows to the outdoor heat exchanger 300 to defrost the outdoor heat exchanger 300. The air conditioner 01 of the present invention is provided with a defrost bypass 600, and the low-temperature refrigerant in the defrost bypass 600 is heated by the high-temperature housing of the compressor 100, thereby achieving the purpose of defrosting the outdoor heat exchanger 300.

[0086] The air conditioner 01 of this embodiment adds a defrost bypass 600 and a control valve group 500 to the traditional heat pump system. For the heating environment, the flow direction of the refrigerant in the refrigerant pipeline can be controlled by controlling the opening and closing of the first control valve 510 and the second control valve 520. When the first control valve 510 is opened and the second control valve 520 is closed, the refrigerant passing through the liquid pipe stop valve 900 flows to the first control valve 510, and is heated by the high-temperature outer shell of the compressor 100 when passing through the pipeline around the compressor 100, and then enters the outdoor heat exchanger 300 after passing through the expansion valve 400 to achieve the purpose of defrosting.

[0087] In the heating operation state, the coil temperature of the outdoor heat exchanger 300 is detected, and the heating environment is divided into a normal heating environment and a severe heating environment according to whether the coil temperature is greater than the first preset temperature. For the normal heating environment, the control method is to increase the speed of the outdoor fan 201 by one gear, reduce the speed of the indoor fan 101 by one gear, and reduce the frequency of the compressor 100 by 2Hz. If the above measures cannot increase the coil temperature of the outdoor heat exchanger 300, the current environment is determined to be a severe heating environment. For the severe heating environment, the first control valve 510 and the second control valve 520 are directly opened, and the refrigerant in the defrost bypass 600 is heated by the high temperature of the compressor 100 shell, thereby achieving the purpose of defrosting the outdoor heat exchanger 300.

[0088] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0089] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, so that the two components can be connected internally. For ordinary technicians in this field, the specific meanings of the above-mentioned terms in this application can be understood according to specific circumstances.

[0090] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0091] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. An air conditioner, comprising: A refrigeration cycle system, comprising a compressor, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger connected in sequence by a refrigerant pipeline; a defrost bypass, one end of which is connected to the refrigerant outflow end of the indoor heat exchanger, and the other end of which is connected to the refrigerant inflow end of the expansion valve; Part of the defrost bypass is arranged close to the compressor, and the refrigerant in the defrost bypass is heated by the compressor and then flows to the outdoor heat exchanger to defrost the outdoor heat exchanger.

2. The air conditioner according to claim 1, further comprising: The control valve group is used to control the flow of the refrigerant in the defrost bypass and the refrigeration cycle system.

3. The air conditioner according to claim 2, wherein: The control valve group comprises: a first control valve, disposed in the defrost bypass and located upstream of the portion of the defrost bypass, for controlling a refrigerant flow in the defrost bypass; The second control valve is arranged in the refrigeration cycle system and is located downstream of the indoor heat exchanger and upstream of the expansion valve. The second control valve is connected in parallel with the defrost bypass and is used to control the refrigerant flow of the refrigeration cycle system.

4. The air conditioner according to claim 3, further comprising: The defrost temperature sensor is arranged on the outdoor heat exchanger and is used to detect the coil temperature of the outdoor heat exchanger.

5. The air conditioner according to claim 4, wherein: The first control valve is configured to open when the coil temperature of the outdoor heat exchanger is lower than or equal to a first preset temperature; the second control valve is configured to close when the coil temperature of the outdoor heat exchanger is lower than or equal to the first preset temperature.

6. The air conditioner according to claim 5, wherein: The first control valve is configured to be closed when the coil temperature of the outdoor heat exchanger is higher than or equal to a second preset temperature; the second control valve is configured to be closed when the coil temperature of the outdoor heat exchanger is higher than or equal to a second preset temperature.

7. The air conditioner according to claim 5, wherein: Also includes: An indoor fan, used for causing a heat exchange airflow to be formed for exchanging heat with the indoor heat exchanger; The outdoor fan is used to promote the formation of a heat exchange airflow for exchanging heat with the outdoor heat exchanger.

8. The air conditioner according to claim 7, wherein: The outdoor fan is configured to increase its speed when the coil temperature is higher than the first preset temperature.

9. The air conditioner according to claim 8, wherein: The indoor fan is configured to reduce the rotation speed if the coil temperature does not increase after the outdoor fan increases the rotation speed.

10. The air conditioner according to claim 9, wherein: The compressor is configured to reduce the frequency after the indoor fan reduces the rotation speed if the coil temperature does not increase.

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