Air conditioner and control method of air conditioner

Abstract

The invention discloses an air conditioner and a control method of the air conditioner, the air conditioner comprises a forced cooling pipeline, the first end of the forced cooling pipeline is connected with an outlet of each group of heat exchange pipelines, and the second end of the forced cooling pipeline is connected with an inlet of each group of second heat exchange pipelines; the first end of the backflow pipeline is connected with an outlet of each group of second heat exchange pipelines, and the second end of the backflow pipeline is connected with the four-way valve; the controller is configured to control the first control valves on the at least one group of second heat exchange pipelines to be closed and control the second control valves on the at least one group of second heat exchange pipelines to be closed in the forced cooling mode; and the on-off states of the third control valve and the fourth control valve are controlled according to the target refrigeration temperature and the indoor air outlet temperature, so that at least one set of heat exchange pipeline, the forced cooling pipeline and the backflow pipeline are communicated, refrigeration can be achieved or the refrigeration capacity of the air conditioner can be improved in the ultra-high-temperature environment through the air conditioner, and the user experience is improved.

Description

Technical Field

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

[0002] In the related art, the existing air conditioners are unable to perform cooling at ultra-high outdoor ambient temperatures due to limitations such as maximum working pressure and maximum exhaust temperature, or their cooling capacity is very poor at ultra-high outdoor ambient temperatures, resulting in high indoor air outlet temperatures and poor user experience. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an air conditioner, which can realize cooling in an ultra-high temperature environment or improve the cooling capacity of the air conditioner, thereby improving user experience.

[0004] A second object of the present invention is to provide a control method for an air conditioner.

[0005] In order to solve the above problems, an embodiment of the first aspect of the present invention proposes an air conditioner, comprising: a refrigerant circulation loop, so that the refrigerant circulates in a loop composed of a vapor-liquid separator, a compressor, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and a four-way valve; the outdoor heat exchanger comprises a plurality of groups of heat exchange pipelines, the plurality of groups of heat exchange pipelines comprise N groups of first heat exchange pipelines and M groups of second heat exchange pipelines, the inlet of each group of first heat exchange pipelines is directly connected to the four-way valve, the outlet of each group of first heat exchange pipelines is directly connected to the throttling device, the inlet of each group of second heat exchange pipelines is connected to the four-way valve via a first control valve, and the outlet of each group of second heat exchange pipelines is connected to the throttling device via a second control valve, wherein N≥1, M≥1; a strong cooling pipeline, the first end of the strong cooling pipeline is connected to the outlet of each group of heat exchange pipelines, and the second end of the strong cooling pipeline is connected to the inlet of each group of second heat exchange pipelines; a third control valve , the third control valve is arranged on the strong cooling pipeline to open or close the strong cooling pipeline; a return pipeline, a first end of the return pipeline is connected to the outlet of each group of second heat exchange pipelines, and a second end of the return pipeline is connected to the four-way valve; a fourth control valve, the fourth control valve is arranged on the return pipeline to open or close the return pipeline; a controller, the controller is respectively connected to the first control valve, the second control valve, the third control valve and the fourth control valve, and the controller is configured to: in the strong cooling mode, control the first control valve on at least one group of second heat exchange pipelines to close, and control the second control valve on at least one group of second heat exchange pipelines to close; control the switching states of the third control valve and the fourth control valve according to the target cooling temperature and the indoor air outlet temperature, so that the at least one group of heat exchange pipelines, the strong cooling pipeline and the return pipeline are connected.

[0006] According to the air conditioner of the embodiment of the present invention, by adding a strong cooling pipeline and a return pipeline, when operating the strong cooling mode in an ultra-high temperature environment, the first control valve and the second control valve on at least one group of second heat exchange pipelines are controlled to be closed, and the third control valve and the fourth control valve are controlled to be connected, so that at least one group of first heat exchange pipelines and the strong cooling pipeline are connected, and the strong cooling pipeline and at least one group of second heat exchange pipelines are connected, and the return pipeline and at least one group of second heat exchange pipelines are connected, so that the outdoor environment temperature is reduced through the second heat exchange pipeline, so that when the high-temperature and high-pressure refrigerant continuously flows into the multiple groups of first heat exchange pipelines, heat exchange can be performed with the outdoor environment to a greater extent, so that the refrigerant temperature can be reduced to a greater extent, thereby achieving refrigeration in an ultra-high temperature environment or improving the refrigeration capacity of the air conditioner, and improving user experience. In addition, the air conditioner in the present application can judge the actual refrigeration capacity of the air conditioner by the target refrigeration temperature and the indoor air outlet temperature, so as to partially or completely connect the second heat exchange pipeline with the strong cooling pipeline and the return pipeline in combination with the actual refrigeration capacity of the air conditioner, so as to adaptively adjust the refrigeration effect of the air conditioner.

[0007] In some embodiments, the forced cooling pipeline includes: a first main pipeline and M forced cooling branches, the inlet of the first main pipeline is connected to the outlet of each group of heat exchange pipelines, the inlet of each forced cooling branch is connected to the first main pipeline, and the outlet of each forced cooling branch is connected to the inlet of each group of second heat exchange pipelines; wherein, the number of the third control valves is one, and the third control valve is arranged on the first main pipeline, and the third control valve is used to simultaneously open or simultaneously cut off all forced cooling branches.

[0008] In some embodiments, the reflux pipeline includes: a second main pipeline and M reflux branches, the outlet of the second main pipeline is connected to the four-way valve, the inlet of each reflux branch is connected to the outlet of each group of second heat exchange pipelines, and the outlet of each strong cooling branch is connected to the second main pipeline; wherein, the number of the fourth control valve is one, and the fourth control valve is arranged on the second main pipeline, and the fourth control valve is used to simultaneously open or simultaneously cut off all reflux branches.

[0009] In some embodiments, the forced cooling pipeline includes: a first main pipeline and M forced cooling branches, the inlet of the first main pipeline is connected to the outlet of each group of heat exchange pipelines, the inlet of each forced cooling branch is connected to the first main pipeline, and the outlet of each forced cooling branch is connected to the inlet of each group of second heat exchange pipelines; wherein, the number of the third control valves is M, and each third control valve is correspondingly arranged on each forced cooling branch, and the third control valve is used to turn on or off the corresponding forced cooling branch.

[0010] In some embodiments, the reflux pipeline includes: a second main pipeline and M reflux branches, the outlet of the second main pipeline is connected to the four-way valve, the inlet of each reflux branch is connected to the outlet of each group of second heat exchange pipelines, and the outlet of each strong cooling branch is connected to the second main pipeline; wherein, the number of the fourth control valves is M, and each fourth control valve is correspondingly arranged on each reflux branch, and the fourth control valve is used to turn on or off the corresponding reflux branch.

[0011] In some embodiments, the controller is further configured to: in a normal refrigeration mode, control the third control valve and the fourth control valve to be closed; and control each first control valve and each second control valve to be opened.

[0012] In some embodiments, the controller is further configured to: in heating mode, determine that the air conditioner meets the defrost conditions; control the first control valve on at least one group of second heat exchange pipelines to close, and control the second control valve on at least one group of second heat exchange pipelines to close; control the switching states of the third control valve and the fourth control valve according to the outdoor ambient temperature and the outdoor coil temperature to enable conduction between the at least one group of heat exchange pipelines, the forced cooling pipeline and the return pipeline.

[0013] A second aspect of the present invention provides a method for controlling an air conditioner, which is used for the air conditioner described in the above embodiment. The control method includes: in the forced cooling mode, controlling the first control valve on at least one group of second heat exchange pipelines to close, and controlling the second control valve on the at least one group of second heat exchange pipelines to close; controlling the switching states of the third control valve and the fourth control valve according to the target cooling temperature and the indoor air outlet temperature to make the at least one group of heat exchange pipelines, the forced cooling pipeline and the return pipeline conductive.

[0014] According to the control method of the air conditioner of the embodiment of the present invention, by adding a strong cooling pipeline and a return pipeline, when operating the strong cooling mode in an ultra-high temperature environment, the first control valve and the second control valve on at least one group of second heat exchange pipelines are controlled to be closed, and the third control valve and the fourth control valve are controlled to be connected, so that at least one group of first heat exchange pipelines and the strong cooling pipeline are connected, and the strong cooling pipeline and at least one group of second heat exchange pipelines are connected, and the return pipeline and at least one group of second heat exchange pipelines are connected, so that the outdoor environment temperature is reduced through the second heat exchange pipeline, so that when the high-temperature and high-pressure refrigerant continuously flows into the multiple groups of first heat exchange pipelines, heat exchange can be performed with the outdoor environment to a greater extent, so that the refrigerant temperature can be reduced to a greater extent, thereby achieving refrigeration in an ultra-high temperature environment or improving the refrigeration capacity of the air conditioner, and improving the user experience. In addition, the air conditioner in the present application can judge the actual refrigeration capacity of the air conditioner by the target refrigeration temperature and the indoor air outlet temperature, so as to partially or completely connect the second heat exchange pipeline with the strong cooling pipeline and the return pipeline in combination with the actual refrigeration capacity of the air conditioner, so as to adaptively adjust the refrigeration effect of the air conditioner.

[0015] In some embodiments, the control method further includes: in a normal cooling mode, controlling the third control valve and the fourth control valve to be closed; and controlling each first control valve and each second control valve to be opened.

[0016] In some embodiments, the control method also includes: in heating mode, determining that the air conditioner meets the defrost conditions; controlling the first control valve on at least one group of second heat exchange pipelines to close, and controlling the second control valve on at least one group of second heat exchange pipelines to close; controlling the switching states of the third control valve and the fourth control valve according to the outdoor ambient temperature and the outdoor coil temperature to enable conduction between the at least one group of heat exchange pipelines, the forced cooling pipeline and the return pipeline.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of an air conditioner according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of air conditioner pipe connection according to one embodiment of the present invention;

[0021] Figure 3 is a structural block diagram of an air conditioner according to an embodiment of the present invention;

[0022] Figure 4 is a structural block diagram of an air conditioner according to another embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of air conditioner pipe connection according to another embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of a working state of an outdoor heat exchanger in a forced cooling mode according to an embodiment of the present invention;

[0025] Figure 7 is a schematic diagram of a forced cooling pipeline and a return pipeline of an air conditioner according to an embodiment of the present invention;

[0026] Figure 8 is a flow chart of a method for controlling an air conditioner according to an embodiment of the present invention;

[0027] Fig. 9 is a flow chart of a method for controlling an air conditioner according to another embodiment of the present invention;

[0028] Fig.10 is a flow chart of a method for controlling an air conditioner according to another embodiment of the present invention;

[0029] Reference numerals:

[0030] Air conditioner 100;

[0031] Vapor-liquid separator 1; compressor 2; outdoor heat exchanger 3; throttling device 4; indoor heat exchanger 5; four-way valve 6; forced cooling pipeline 7; third control valve 8; return pipeline 9; fourth control valve 10; controller 11; heat exchange pipeline 33; first heat exchange pipeline 31; second heat exchange pipeline 32; first control valve 34; second control valve 35; first main pipeline 71; forced cooling branch 72; second main pipeline 91; return branch 92. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0033] In the related art, the existing air conditioners are unable to perform cooling at ultra-high outdoor ambient temperatures due to limitations such as maximum working pressure and maximum exhaust temperature, or their cooling capacity is very poor at ultra-high outdoor ambient temperatures, resulting in high indoor air outlet temperatures and poor user experience.

[0034] In order to solve the above problems, a first embodiment of the present invention proposes an air conditioner, which can achieve cooling in an ultra-high temperature environment or improve the cooling capacity of the air conditioner, thereby improving user experience.

[0035] Reference below Figure 1 and Figure 2 An air conditioner according to an embodiment of the present invention is described. Figure 1 and Figure 2 As shown, the air conditioner 100 includes: a refrigerant circulation loop, a forced cooling pipeline 7, a third control valve 8, a return pipeline 9, a fourth control valve 10 and a controller 11.

[0036] The refrigerant circulation loop allows the refrigerant to circulate in a loop composed of a vapor-liquid separator 1, a compressor 2, an outdoor heat exchanger 3, a throttling device 4, an indoor heat exchanger 5 and a four-way valve 6; the outdoor heat exchanger 3 includes a plurality of heat exchange pipelines 33, and the plurality of heat exchange pipelines 33 include N groups of first heat exchange pipelines 31 and M groups of second heat exchange pipelines 32. The inlet of each group of first heat exchange pipelines 31 is directly connected to the four-way valve 6, and the outlet of each group of first heat exchange pipelines 31 is directly connected to the throttling device 4. The inlet of each group of second heat exchange pipelines 32 is connected to the four-way valve 6 through a first control valve 34, and each group of second heat exchange pipelines 32 is connected to the four-way valve 6 through a first control valve 34. The outlet of the cooling line 32 is connected to the throttling device 4 through a second control valve 35, wherein N≥1, M≥1; the first end of the strong cooling line 7 is connected to the outlet of each group of heat exchange lines 33, and the second end of the strong cooling line 7 is connected to the inlet of each group of second heat exchange lines 32; the third control valve 8 is arranged on the strong cooling line 7 to be used for opening or closing the strong cooling line 7; the first end of the return line 9 is connected to the outlet of each group of second heat exchange lines 32, and the second end of the return line 9 is connected to the four-way valve 6; the fourth control valve 10 is arranged on the return line 9 to be used for opening or closing the return line 9; Figure 3 and Figure 4 As shown, the controller 11 is connected to the first control valve 34 , the second control valve 35 , the third control valve 8 and the fourth control valve 10 , respectively.

[0037] The controller 11 is configured to achieve cooling in an ultra-high temperature outdoor environment through the following steps.

[0038] In the forced cooling mode, the first control valve on at least one group of second heat exchange pipelines is controlled to be closed, and the second control valve on at least one group of second heat exchange pipelines is controlled to be closed.

[0039] The forced cooling mode of the air conditioner in the present application is a cooling mode that operates when the outdoor ambient temperature is too high, resulting in the inability of the air conditioner to cool or the inability to cool the air conditioner. In the forced cooling mode, it can break through the limitations of the maximum working pressure and maximum exhaust temperature of the air conditioner, achieve cooling in an ultra-high temperature environment, or improve the cooling capacity of the air conditioner.

[0040] Specifically, when the user wants to turn on the forced cooling mode, the user can turn on the forced cooling mode through the remote control, the air conditioning application in the mobile terminal or the control panel on the body of the air conditioner through language, gestures and other operations. Or when the temperature sensor installed on the outdoor unit of the air conditioner detects that the outdoor ambient temperature is higher than the preset outdoor ambient temperature, or when the temperature sensor installed on the indoor unit of the air conditioner detects that the indoor air outlet temperature is higher than the set temperature, the controller 11 automatically controls the air conditioner to run the forced cooling mode to achieve cooling in an ultra-high temperature environment or to improve the cooling capacity of the air conditioner. That is, when the air conditioner is running in the forced cooling mode, the first control valve 34 on at least one group of the second heat exchange pipelines 32 is controlled to be closed, and the second control valve 35 on at least one group of the second heat exchange pipelines 32 is controlled to be closed, so that the refrigerant flowing into the outdoor heat exchanger 3 cannot flow in from the inlet of the second heat exchange pipeline 32, thereby changing the refrigerant flow direction in at least one group of the second heat exchange pipelines 32.

[0041] The switching states of the third control valve and the fourth control valve are controlled according to the target cooling temperature and the indoor air outlet temperature, so that at least one group of heat exchange pipelines, strong cooling pipelines and return pipelines are connected.

[0042] Specifically, due to limitations such as maximum working pressure and maximum exhaust temperature, existing air conditioners cannot perform cooling at ultra-high outdoor ambient temperatures, or have very poor cooling capacity at ultra-high outdoor ambient temperatures, so that the indoor air outlet temperature is high and the user experience is poor. In order to solve this problem, the air conditioner in the present application adds two pipelines from the outdoor heat exchanger 3, one is a strong cooling pipeline 7 connected to the inlet of each group of second heat exchange pipelines 32 to the outlet of each group of heat exchange pipelines 33, and the other is a return pipeline 9 connected to the four-way valve 6 from the outlet of each group of second heat exchange pipelines 32. When the air conditioner is in the strong cooling mode, the first control valve 34 on at least one group of second heat exchange pipelines 32 is controlled to be closed, and the second control valve 35 on at least one group of second heat exchange pipelines 32 is controlled to be closed, so that the refrigerant flowing into the outdoor heat exchanger 3 no longer flows in from the inlet of the second heat exchange pipeline 32, thereby changing the flow direction of the refrigerant in at least one group of second heat exchange pipelines 32. At the same time, the actual cooling capacity of the air conditioner is judged by the target cooling temperature and the indoor air outlet temperature, so as to combine the air The actual cooling capacity of the air conditioner controls the switching state of the third control valve 8 and the fourth control valve 10, wherein the opening degree of the third control valve 8 and the fourth control valve 10 can be fully open or partially open, and there is no restriction on this, so that at least one group of heat exchange pipelines, the strong cooling pipeline 7 and the return pipeline 9 are connected, that is, according to the actual cooling capacity of the air conditioner, part of the second heat exchange pipeline or all the heat exchange pipelines are controlled to be connected with the strong cooling pipeline 7 and the return pipeline 9, so that the refrigerant after cooling in the N group of first heat exchange pipelines flows into the M group of second heat exchange pipelines 32 through the strong cooling pipeline 7 to absorb heat to improve the outdoor ultra-high temperature environment, that is, the low-temperature liquid refrigerant flows into the M group of second heat exchange pipelines 32 through the strong cooling pipeline 7 to absorb heat, so that the ambient temperature around the outdoor unit is reduced, so that when the high-temperature and high-pressure refrigerant continuously flows into multiple groups of first heat exchange pipelines 31, it can exchange heat with the outdoor environment to a greater extent, and then the refrigerant temperature can be reduced to a greater extent, thereby achieving refrigeration or improving the refrigeration capacity of the air conditioner in an ultra-high temperature environment, thereby improving user experience. In addition, the air conditioner in the present application can judge the actual cooling capacity of the air conditioner based on the target cooling temperature and the indoor air outlet temperature, and partially or fully connect the second heat exchange pipeline 32 with the strong cooling pipeline 7 and the return pipeline 9 in combination with the actual cooling capacity of the air conditioner, so as to adaptively adjust the cooling effect of the air conditioner.

[0043] Specifically, when the air conditioner is in the forced cooling mode, the first control valve 34 on at least one group of second heat exchange pipelines 32 is controlled to be closed, and the second control valve 35 on the at least one group of second heat exchange pipelines 32 is controlled to be closed, and the switching states of the third control valve 8 and the fourth control valve 10 are controlled according to the target cooling temperature and the indoor air outlet temperature, so that the at least one group of heat exchange pipelines, the forced cooling pipeline 7 and the return pipeline 9 are connected. That is to say, the high-temperature and high-pressure refrigerant discharged from the compressor 2 flows into the outdoor heat exchanger 3 through the D and C valve ports of the four-way valve 6. At this time, due to the at least one group of second heat exchange pipelines The first control valve 34 on the pipeline 32 is closed and the refrigerant cannot flow through. Therefore, the high-temperature and high-pressure refrigerant flowing into the outdoor heat exchanger 3 only flows into the inlet of the N groups of first heat exchange pipelines 31. The high-temperature and high-pressure refrigerant is cooled into low-temperature and high-pressure refrigerant through the N groups of first heat exchange pipelines 31. A part of the low-temperature and high-pressure refrigerant flows into the throttling device 4 from the outlet of each group of first heat exchange pipelines 31, and after throttling by the throttling device 4, it flows into the indoor heat exchanger 5 to exchange heat with the indoor environment, thereby reducing the indoor temperature. Since at least one group of heat exchange pipelines, the strong cooling pipeline 7 and the return pipeline 9 are connected, that is, at least one group of first heat exchange pipelines 31 and the strong cooling pipeline 7 are connected. The cold pipes 7 are connected, and the strong cooling pipe 7 is connected to at least one group of second heat exchange pipes 32, and the return pipe 9 is connected to at least one group of second heat exchange pipes 32. Therefore, another part of the low-temperature and high-pressure refrigerant is throttled into a low-temperature liquid refrigerant through the third control valve 8 and then flows into the strong cooling pipe 7, and then flows into the M groups of second heat exchange pipes 32 from the strong cooling pipe 7. The low-temperature liquid refrigerant in each group of second heat exchange pipes 32 evaporates and absorbs heat to form a high-temperature gaseous refrigerant, so that the ambient temperature around the outdoor unit is reduced. The high-temperature gaseous refrigerant after absorbing heat flows into the four-way valve 6 through the return pipe 9, and then flows into the four-way valve 6 from the E valve port and S valve port of the four-way valve 6. The valve port flows into the vapor-liquid separator 1, and the refrigerant is separated into vapor and liquid by the vapor-liquid separator 1 and then flows back to the compressor 2, so that when the high-temperature and high-pressure refrigerant continuously flows into the N-group first heat exchange pipeline 31, it can exchange heat with the outdoor environment to a greater extent, thereby reducing the refrigerant temperature to a greater extent. As a result, the refrigerant flows in the above manner, and continuously reduces the temperature of the refrigerant flowing into the indoor heat exchanger 5 by reducing the ambient temperature of the outdoor unit, so as to improve the indoor air outlet comfort, and after the temperature of the entire system is reduced, the operating frequency of the compressor is increased, so as to achieve refrigeration in an ultra-high temperature environment or improve the refrigeration capacity of the air conditioner, thereby improving the user experience. In addition, the air conditioner in the present application can judge the actual refrigeration capacity of the air conditioner by the target refrigeration temperature and the indoor air outlet temperature, so as to partially or completely conduct the second heat exchange pipeline 32 with the strong cooling pipeline 7 and the return pipeline 9 in combination with the actual refrigeration capacity of the air conditioner, so as to adaptively adjust the refrigeration effect of the air conditioner.

[0044] For example, Figure 5As shown, the multiple groups of heat exchange pipelines include four groups of first heat exchange pipelines and three groups of second heat exchange pipelines. The four groups of first heat exchange pipelines are respectively the first group of first heat exchange pipelines L1, the second group of first heat exchange pipelines L2, the third group of first heat exchange pipelines L3 and the fourth group of first heat exchange pipelines L7, and the three groups of second heat exchange pipelines are respectively the first group of second heat exchange pipelines L4, the second group of second heat exchange pipelines L5 and the third group of second heat exchange pipelines L6. When the air conditioner is running in the forced cooling mode, as shown in FIG. Figure 4-Figure 6 As shown, the first control valve and the second control valve on the first group of second heat exchange pipelines L4, the second group of second heat exchange pipelines L5 and the third group of second heat exchange pipelines L6 are controlled to be closed. At this time, the first group of second heat exchange pipelines L4, the second group of second heat exchange pipelines L5 and the third group of second heat exchange pipelines L6 cannot flow through the refrigerant, and the high-temperature and high-pressure refrigerant discharged from the compressor flows into the first group of first heat exchange pipelines L1, the second group of first heat exchange pipelines L2, the third group of first heat exchange pipelines L3 and the fourth group of first heat exchange pipelines L7 through the D and C valve ports of the four-way valve, respectively, and the high-temperature and high-pressure refrigerant The three groups of first heat exchange pipelines are cooled into low-temperature and high-pressure refrigerant, and a part of the low-temperature and high-pressure refrigerant flows into the indoor heat exchanger from the outlet of each group of first heat exchange pipelines to exchange heat with the indoor environment, thereby reducing the indoor temperature. In the forced cooling mode, the switching states of the third control valve and the fourth control valve are controlled to make at least one group of heat exchange pipelines, the forced cooling pipeline and the return pipeline conductive. That is to say, according to the cooling capacity of the air conditioner, part of the second heat exchange pipeline or all of the second heat exchange pipelines are controlled to be conductive with the forced cooling pipeline and the return pipeline, and the other part of the low-temperature and high-pressure refrigerant is conductive to the forced cooling pipeline and the return pipeline. The refrigerant is throttled into low-temperature liquid refrigerant by the third control valve and then flows into the forced cooling pipeline. At this time, the refrigerant then flows into one or more of the second heat exchange tubes of the first group of second heat exchange pipelines L4, the second group of second heat exchange pipelines L5 and the third group of second heat exchange pipelines L6 through the forced cooling pipeline. The low-temperature liquid refrigerant in each group of second heat exchange pipelines evaporates and absorbs heat to form a high-temperature gaseous refrigerant, so that the ambient temperature around the outdoor unit is reduced. The refrigerant after absorbing heat flows into the four-way valve through the return pipeline, and then flows into the vapor-liquid separator from the E valve port and the S valve port of the four-way valve. After passing through the vapor-liquid The separator separates the refrigerant into vapor and liquid and then flows back to the compressor, so that when the high-temperature and high-pressure refrigerant continuously flows into the first heat exchange pipeline of group N, it can exchange heat with the outdoor environment to a greater extent, thereby reducing the refrigerant temperature to a greater extent. The refrigerant thus flows in the above manner, continuously reducing the temperature of the refrigerant flowing into the indoor heat exchanger by lowering the ambient temperature around the outdoor unit, so as to improve the indoor air outlet comfort, and after the temperature of the entire system is reduced, the operating frequency of the compressor is increased, thereby achieving refrigeration in an ultra-high temperature environment or increasing the refrigeration capacity of the air conditioner, thereby improving the user experience.

[0045] In addition, the control valve in the present application may be a solenoid valve, an electronic expansion valve or other valves for controlling opening and closing, and there is no limitation on this.

[0046] According to the air conditioner of the embodiment of the present invention, by adding a strong cooling pipeline 7 and a return pipeline 9, when operating in the strong cooling mode in an ultra-high temperature environment, the first control valve 34 and the second control valve 35 on at least one group of second heat exchange pipelines 32 are controlled to be closed, and the third control valve 8 and the fourth control valve 10 are controlled to be connected, so that at least one group of first heat exchange pipelines 31 and the strong cooling pipeline 7 are connected, as well as the strong cooling pipeline 7 and at least one group of second heat exchange pipelines 32 are connected, and the return pipeline 9 and at least one group of second heat exchange pipelines 32 are connected, so as to reduce the outdoor environment temperature through the second heat exchange pipeline 32, so that when the high-temperature and high-pressure refrigerant continuously flows into multiple groups of first heat exchange pipelines 31, heat exchange can be carried out with the outdoor environment to a greater extent, thereby reducing the refrigerant temperature to a greater extent, thereby achieving refrigeration in an ultra-high temperature environment or improving the refrigeration capacity of the air conditioner, thereby improving user experience. In addition, the air conditioner in the present application can judge the actual cooling capacity of the air conditioner based on the target cooling temperature and the indoor air outlet temperature, and partially or fully connect the second heat exchange pipeline 32 with the strong cooling pipeline 7 and the return pipeline 9 in combination with the actual cooling capacity of the air conditioner, so as to adaptively adjust the cooling effect of the air conditioner.

[0047] In some embodiments, Figure 7 As shown, the strong cooling pipeline 7 includes: a first main pipeline 71 and M strong cooling branches 72, the inlet of the first main pipeline 71 is connected to the outlet of each group of heat exchange pipelines 33, the inlet of each strong cooling branch 72 is connected to the first main pipeline 71, and the outlet of each strong cooling branch 72 is connected to the inlet of each group of second heat exchange pipelines 32; wherein, the number of the third control valve 8 is one, and the third control valve 8 is arranged on the first main pipeline 71, and the third control valve 8 is used to simultaneously turn on or off all the strong cooling branches 72.

[0048] Specifically, when the air conditioner is in the forced cooling mode, the first control valve 34 on at least one group of second heat exchange pipelines 32 is controlled to be closed, and the second control valve 35 on at least one group of second heat exchange pipelines 32 is controlled to be closed, and then the switching states of the third control valve 8 and the fourth control valve 10 are controlled according to the target cooling temperature and the indoor air outlet temperature, so that at least one group of heat exchange pipelines, the forced cooling pipeline 7 and the return pipeline 9 are connected, and since the third control valve 8 is arranged on the first main pipeline 71, so that the third control valve 8 can conduct all the forced cooling branches 72, a part of the low-temperature and high-pressure refrigerant flowing out of at least one group of first heat exchange pipelines 31 can be throttled into a low-temperature liquid refrigerant through the third control valve 8 on the first main pipeline 71, and then flow into the first main pipeline 71 through the third control valve 8. A main line 71 flows into M strong cooling branches 72, and then flows from the M strong cooling branches 72 into the second heat exchange line 32 corresponding to each strong cooling branch 72. The low-temperature liquid refrigerant in each second heat exchange line 32 evaporates and absorbs heat to form a high-temperature gaseous refrigerant, so that the ambient temperature around the outdoor unit is reduced. Therefore, based on the connection method of the air conditioner's strong cooling line 7, return line 9 and heat exchange line 33, the switching state of the third control valve 8 on the first main line 71 is controlled to connect the strong cooling line 7 and the second heat exchange line 32, so that the refrigerant in the first heat exchange line 31 flowing into the indoor heat exchanger 5 is continuously passed through the refrigerant flowing into the second heat exchange line 32 to reduce the ambient temperature around the outdoor unit, thereby achieving refrigeration in an ultra-high temperature environment or improving the refrigeration capacity of the air conditioner, thereby improving user experience. In addition, in the present application, a control valve is provided in the first main pipeline 71 to connect all the second heat exchange pipelines 32 and the strong cooling pipeline 7, so that the refrigerant flows in all the second heat exchange pipelines 32, thereby greatly improving the cooling effect of the air conditioner.

[0049] In some embodiments, Figure 7 As shown, the reflux pipeline 9 includes: a second main pipeline 91 and M reflux branches 92, the outlet of the second main pipeline 91 is connected to the four-way valve 6, the inlet of each reflux branch 92 is connected to the outlet of each group of second heat exchange pipelines 32, and the outlet of each strong cooling branch 72 is connected to the second main pipeline 91; wherein, the number of the fourth control valve 10 is one, and the fourth control valve 10 is arranged on the second main pipeline 91, and the fourth control valve 10 is used to simultaneously open or simultaneously close all the reflux branches 92.

[0050] Specifically, since the third control valve 8 is arranged on the first main line 71, so that the third control valve 8 can conduct all the strong cooling branches 72, and the fourth control valve 10 is arranged on the first main line 71, so that the fourth control valve 10 is used to simultaneously conduct all the return branches 92, therefore, a portion of the low-temperature and high-pressure refrigerant flowing out of at least one group of first heat exchange pipelines 31 can be throttled into low-temperature liquid refrigerant by the third control valve 8 on the first main line 71 and then flow into the first main line 71, and then flow into the M strong cooling branches 72 through the first main line 71, and flow from the M strong cooling branches 72 into the second heat exchange pipeline 32 corresponding to each strong cooling branch 72, and the low-temperature liquid refrigerant in the second heat exchange pipeline 32 evaporates and absorbs heat to form a high-temperature gaseous refrigerant, so that The ambient temperature of the outdoor unit is reduced, and then the air flows from the outlet of each group of the second heat exchange pipelines 32 into the corresponding return branch 92, flows from the return branch 92 into the second main pipeline 91, and then flows back to the compressor 2 from the second main pipeline 91, the four-way valve 6 and the vapor-liquid separator. Therefore, based on the connection method of the air conditioner's strong cooling pipeline 7, the return pipeline 9 and the heat exchange pipeline 33, the switching state of the third control valve 8 on the first main pipeline 71 is controlled to connect the strong cooling pipeline 7 and the second heat exchange pipeline 32, so that the refrigerant flowing into the second heat exchange pipeline 32 is continuously passed to reduce the ambient temperature of the outdoor unit to reduce the temperature of the refrigerant in the first heat exchange pipeline 31 flowing into the indoor heat exchanger 5, thereby achieving refrigeration in an ultra-high temperature environment or improving the refrigeration capacity of the air conditioner, thereby improving user experience. In addition, in the present application, a control valve is respectively set in the first main line 71 and the second main line 91 to connect all the second heat exchange lines 32 with the strong cooling line 7 and the return line 9, so that the refrigerant can flow in all the second heat exchange lines 32 to reduce the outdoor ambient temperature and improve the indoor air outlet comfort. After the temperature of the entire system is reduced, the operating frequency of the compressor is increased, thereby achieving refrigeration in an ultra-high temperature environment or improving the refrigeration capacity of the air conditioner, thereby improving the user experience.

[0051] In some embodiments, Figure 7 As shown, the strong cooling pipeline 7 includes: a first main pipeline 71 and M strong cooling branches 72, the inlet of the first main pipeline 71 is connected to the outlet of each group of heat exchange pipelines 33, the inlet of each strong cooling branch 72 is connected to the first main pipeline 71, and the outlet of each strong cooling branch 72 is connected to the inlet of each group of second heat exchange pipelines 32; wherein, the number of third control valves 8 is M, and each third control valve 8 is correspondingly arranged on each strong cooling branch 72, and the third control valve 8 is used to turn on or off the corresponding strong cooling branch 72.

[0052] In some embodiments, Figure 7As shown, the reflux pipeline 9 includes: a second main pipeline 91 and M reflux branches 92, the outlet of the second main pipeline 91 is connected to the four-way valve 6, the inlet of each reflux branch 92 is connected to the outlet of each group of second heat exchange pipelines 32, and the outlet of each strong cooling branch 72 is connected to the second main pipeline 91; wherein, the number of fourth control valves 10 is M, and each fourth control valve 10 is correspondingly arranged on each reflux branch 92, and the fourth control valve 10 is used to turn on or off the corresponding reflux branch 92.

[0053] Specifically, in the present application, the actual cooling capacity of the air conditioner is judged by the target cooling temperature and the indoor air outlet temperature. If the target cooling temperature and the indoor air outlet temperature differ greatly, it means that the actual cooling capacity of the air conditioner at this time is poor. If the target cooling temperature and the indoor air outlet temperature differ little, it means that the actual cooling capacity of the air conditioner at this time is good. Therefore, the air conditioner in the present application can judge the actual cooling capacity of the air conditioner by the target cooling temperature and the indoor air outlet temperature, and partially or completely connect the second heat exchange pipeline 32 with the strong cooling pipeline 7 and the return pipeline 9 in combination with the actual cooling capacity of the air conditioner, so as to adaptively adjust the cooling effect of the air conditioner. That is to say, the air conditioner The difference between the target cooling temperature and the indoor air outlet temperature is automatically calculated, and then different difference ranges are preset according to the difference between the target cooling temperature and the indoor air outlet temperature, and the number of the conductive return branch 92 and the strong cooling branch 72 corresponding to the difference range is set, and if the difference between the target cooling temperature and the indoor air outlet temperature is large, that is, the difference falls into a larger difference range, then the number of the conductive return branch 92 and the strong cooling branch 72 is large, thereby, the number of the conductive return branch 92 and the strong cooling branch 72 is determined by the difference between the target cooling temperature and the indoor air outlet temperature. For example, if the number of the conductive return branch 92 and the strong cooling branch 72 is a, the third circuit on a strong cooling branch 72 is controlled The control valve is turned on and the third control valve on the remaining Ma strong cooling branches 72 is controlled to be turned off, and the fourth control valve on the return branch 92 corresponding to the a strong cooling branch 72 that is turned on by the third control valve is controlled to be turned on, and the fourth control valve on the remaining Ma return branches 92 is controlled to be turned off, so that a part of the low-temperature and high-pressure refrigerant flowing out of at least one group of first heat exchange pipelines 31 flows into the a strong cooling branches 72 that are turned on through the first main pipeline 71, and then flows into the corresponding second heat exchange pipeline 32 through the a strong cooling branch 72, and the low-temperature liquid refrigerant in the second heat exchange pipeline 32 evaporates and absorbs heat to form a high-temperature gaseous refrigerant, so that the ambient temperature around the outdoor unit is reduced, and then from The outlet of each group of second heat exchange pipelines 32 flows into the corresponding reflux branch 92, flows from the reflux branch 92 into the second main pipeline 91, and then flows back to the compressor 2 from the second main pipeline 91, the four-way valve 6 and the vapor-liquid separator. Therefore, in the present application, a control valve is set at each strong cooling branch 72 and each reflux branch 92 to connect or cut off each strong cooling branch 72 and each reflux branch 92, so that the number of connected strong cooling branches 72 and reflux branches 92 can be determined in combination with the cooling capacity of the air conditioner, so as to adjust the degree of reduction in the outdoor ambient temperature by changing the number of pipelines through which the refrigerant flows in the second heat exchange pipeline 32, thereby adaptively adjusting the cooling effect of the air conditioner.

[0054] In addition, when the air conditioner operates in the forced cooling mode, when the third control valve on a forced cooling branches 72 is controlled to be turned on and the third control valves on the remaining Ma forced cooling branches 72 are controlled to be turned off, the first control valve and the second control valve on the second heat exchange pipeline connected to the remaining Ma forced cooling branches 72 can be controlled to be closed, so that the refrigerant releases heat through the second heat exchange pipeline connected to the remaining Ma forced cooling branches, and absorbs outdoor heat through the a forced cooling branches 72 turned on by the third control valve, thereby further increasing the heat value released by the refrigerant in the remaining Ma second heat exchange pipelines and the first heat exchange pipeline.

[0055] In an embodiment, the number of the conductive return branches 92 and the strong cooling branches 72 is determined by the outdoor ambient temperature. The higher the outdoor ambient temperature, the greater the number of the conductive return branches 92 and the strong cooling branches 72, thereby adaptively adjusting the cooling effect of the air conditioner.

[0056] In some embodiments, Figure 8 As shown, the controller 11 is further configured to perform the following steps.

[0057] Step S1, in the normal cooling mode, the third control valve and are controlled to be closed.

[0058] Step S2, controlling each first control valve and each second control valve to be open.

[0059] Specifically, when the air conditioner is running in the normal cooling mode, the third control valves 8 and 10 are controlled to be closed, and each first control valve 34 and each second control valve 35 are controlled to be opened. The high-temperature and high-pressure refrigerant discharged from the compressor 2 flows into each first heat exchange pipeline 31 and each second heat exchange pipeline 32 through the D and C valve ports of the four-way valve 6. The high-temperature and high-pressure refrigerant is cooled into low-temperature and high-pressure refrigerant through all the first heat exchange pipelines 31 and the second heat exchange pipelines 32, and flows into the throttling device 4 from the outlet of each group of first heat exchange pipelines 31 and the second heat exchange pipeline 32. After throttling by the throttling device 4, it flows into the indoor heat exchanger 5 to exchange heat with the indoor environment, thereby reducing the indoor temperature. The refrigerant flowing out of the indoor heat exchanger 5 flows back to the vapor-liquid separator 1 through the E valve and S valve ports of the four-way valve 6, and flows back to the compressor 2 after the refrigerant is separated into vapor and liquid by the vapor-liquid separator 1, thereby realizing the normal cooling mode.

[0060] In some embodiments, Fig. 9 As shown, the controller 11 is further configured to perform the following steps.

[0061] Step S3: in the heating mode, determining whether the air conditioner meets the defrosting condition.

[0062] Specifically, in the heating mode, when the controller 11 detects that the difference between the outdoor coil temperature and the outdoor environment is greater than a certain value, or detects that the outdoor environment temperature is lower than the outdoor preset temperature preset according to the frosting of the air conditioner, and the outdoor coil temperature is lower than the set coil temperature preset according to the frosting of the air conditioner within the preset time; or detects that the indoor air outlet temperature is lower than the set air outlet temperature preset according to the frosting of the air conditioner; when the outdoor environment temperature is lower than the outdoor preset temperature preset according to the frosting of the air conditioner and the outdoor environment humidity is greater than the preset humidity value, it is determined that the air conditioner meets the defrost conditions.

[0063] Step S4, controlling the first control valve on at least one group of second heat exchange pipelines to be closed, and controlling the second control valve on at least one group of second heat exchange pipelines to be closed.

[0064] Specifically, when the air conditioner is defrosted in the heating mode, the first control valve 34 on at least one group of second heat exchange pipelines 32 is controlled to be closed, and the second control valve 35 on at least one group of second heat exchange pipelines 32 is controlled to be closed, so that the refrigerant flowing into the outdoor heat exchanger 3 cannot flow in from the outlet of the second heat exchange pipeline 32, thereby changing the refrigerant flow direction in at least one group of second heat exchange pipelines 32.

[0065] Step S5, controlling the switch state of the third control valve and according to the outdoor ambient temperature and the outdoor coil temperature, so as to make at least one group of heat exchange pipelines, strong cooling pipelines and return pipelines conductive.

[0066] Specifically, when the air conditioner is running in heating mode, the present application determines the degree of frost of the air conditioner by the outdoor ambient temperature and the outdoor coil temperature. If the outdoor ambient temperature and the outdoor coil temperature differ greatly, it means that the degree of frost of the air conditioner is low at this time. If the outdoor ambient temperature and the outdoor coil temperature differ little, it means that the degree of frost of the air conditioner is low at this time. Therefore, the air conditioner in the present application can determine the degree of frost of the air conditioner by the outdoor ambient temperature and the outdoor coil temperature, and partially or completely connect the second heat exchange pipeline 32 with the strong cooling pipeline 7 and the return pipeline 9 in combination with the degree of frost of the air conditioner, thereby adjusting the number of pipelines of the second heat exchange pipeline 32 where the refrigerant flows. That is to say, the air conditioner The controller automatically calculates the difference between the outdoor ambient temperature and the outdoor coil temperature, and then presets different difference ranges according to the difference between the outdoor ambient temperature and the outdoor coil temperature and sets the number of the conductive return branch 92 and the strong cooling branch 72 corresponding to the difference range. If the difference between the outdoor ambient temperature and the outdoor coil temperature is large, that is, the difference falls into a larger difference range, then the number of the conductive return branch 92 and the strong cooling branch 72 is large. Thus, the number of the conductive return branch 92 and the strong cooling branch 72 is determined by the difference between the outdoor ambient temperature and the outdoor coil temperature. For example, if the number of the conductive return branch 92 and the strong cooling branch 72 is a, the third control valve on a strong cooling branch 72 is controlled to be conductive and the control The third control valves on the remaining Ma strong cooling branches 72 are cut off, and the fourth control valves on the return branches 92 corresponding to the a strong cooling branches 72 that control the third control valve to be turned on are turned on, and the fourth control valves on the remaining Ma return branches 92 are controlled to be cut off, so that the high-temperature and high-pressure refrigerant flowing out of the compressor 2 flows into the a turned-on return branches 92 through the four-way valve 6 and the second main line 91, and then flows into the corresponding second heat exchange pipeline 32 through the a return branch 92. The high-temperature liquid refrigerant in the second heat exchange pipeline 32 releases heat to increase the ambient temperature around the outdoor unit. Therefore, under the same outdoor absolute humidity, the increase in the overall ambient temperature can reduce the outdoor relative humidity, thereby avoiding The air conditioner is frosted, and then flows from the outlet of each group of second heat exchange pipelines 32 into the corresponding strong cooling branch 72, flows from the strong cooling branch 72 into the first main pipeline 71, and then flows back to the compressor 2 from the second main pipeline 91, the four-way valve 6 and the vapor-liquid separator. Therefore, in the present application, a control valve is set in each strong cooling branch 72 and each return branch 92 to connect or cut off each strong cooling branch 72 and each return branch 92, so that the number of connected strong cooling branches 72 and return branches 92 can be determined in combination with the degree of frost of the air conditioner, so as to adjust the degree of reduction of the outdoor ambient temperature by changing the number of pipelines through which the refrigerant flows in the second heat exchange pipeline 32, thereby adaptively adjusting the defrosting effect of the air conditioner.

[0067] In addition, when the air conditioner runs in defrost mode, when the third control valve on a strong cooling branch 72 is controlled to be turned on and the third control valves on the remaining Ma strong cooling branches 72 are controlled to be turned off, the first control valve and the second control valve on the second heat exchange pipeline connected to the remaining Ma strong cooling branches 72 can be controlled to be closed, so that the refrigerant releases heat through the second heat exchange pipeline connected to the remaining Ma strong cooling branches, and absorbs outdoor heat through the a strong cooling branches 72 turned on by the third control valve, thereby allowing the air conditioner to achieve both heating mode and defrost mode.

[0068] In the embodiment, when the air conditioner is running in the heating mode, the present application also determines the degree of frost of the air conditioner by the outdoor ambient temperature or the outdoor coil temperature or the indoor air outlet temperature or the outdoor ambient humidity, and determines the number of the conductive return branch 92 and the strong cooling branch 72 by the outdoor ambient temperature or the outdoor coil temperature or the indoor air outlet temperature or the outdoor ambient humidity, that is, when the outdoor ambient temperature is greatly different from the outdoor preset temperature, and the outdoor coil temperature is lower than the set coil temperature at the preset time, or the indoor air outlet temperature is lower, or when the outdoor ambient temperature is lower and the outdoor ambient humidity is too high, the higher the degree of frost of the air conditioner, the greater the number of the conductive return branch 92 and the strong cooling branch 72. In addition, when the outdoor unit is prone to frost, heating by electric heating of the compressor can ensure the normal operation of the system.

[0069] In the embodiment, when the defrost mode is running, a part of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor flows into the indoor heat exchanger through the E valve port of the four-way valve to exchange heat with the indoor environment, and another part of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor flows into the return pipe through the D and E valve ports of the four-way valve, and flows into the M return branches 92 through the second main pipeline 91 when the fourth control valve is opened, and flows into the corresponding second heat exchange pipeline 32 through the M return branches 92, and the high-temperature liquid in each second heat exchange pipeline 32 After the refrigerant evaporates and releases heat, it forms a high-temperature gaseous refrigerant, which increases the ambient temperature of the outdoor unit, thereby defrosting the outdoor unit. The liquid refrigerant flowing out of each second heat exchange pipeline 32 is collected to the first main pipeline of the strong cooling pipe through the corresponding strong cooling branch. After throttling by the third control valve, a low-pressure liquid refrigerant is obtained, which is combined with the refrigerant flowing out of the indoor heat exchanger, and enters the outdoor heat exchanger from the outlet of the first heat exchange pipeline again for normal evaporation and gasification. The refrigerant flowing out of the outdoor heat exchanger flows back to the compressor through the four-way valve.

[0070] In an embodiment, Figure 2As shown, when the air conditioner operates in heating mode, the first control valve and the second control valve on the second heat exchange pipeline are closed, and a part of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor flows into the indoor heat exchanger through the E valve port of the four-way valve, and exchanges heat with the indoor environment to increase the indoor temperature. The refrigerant flowing out of the indoor heat exchanger flows in through the outlets of the second heat exchange pipeline and the first heat exchange pipeline, and exchanges heat with the outdoor environment. The refrigerant flowing out of the outdoor heat exchanger flows back to the compressor through the four-way valve.

[0071] A second aspect of the present invention provides a method for controlling an air conditioner, which is used in the air conditioner of the above embodiment. Fig.10 As shown, the control method includes: step S6-step S7.

[0072] Step S6, in the forced cooling mode, controlling the first control valve on at least one group of second heat exchange pipelines to be closed, and controlling the second control valve on at least one group of second heat exchange pipelines to be closed.

[0073] The forced cooling mode of the air conditioner in the present application is a cooling mode that operates when the outdoor ambient temperature is too high, resulting in the inability of the air conditioner to cool or the inability to cool the air conditioner. In the forced cooling mode, it can break through the limitations of the maximum working pressure and maximum exhaust temperature of the air conditioner, achieve cooling in an ultra-high temperature environment, or improve the cooling capacity of the air conditioner.

[0074] Specifically, when the user wants to turn on the forced cooling mode, the forced cooling mode can be turned on by language, gestures, etc. through the remote control, the air-conditioning application in the mobile terminal, or the control panel on the body of the air conditioner; or when the temperature sensor installed on the outdoor unit of the air conditioner detects that the outdoor ambient temperature is higher than the preset outdoor ambient temperature, or when the temperature sensor installed on the indoor unit of the air conditioner detects that the indoor air outlet temperature is higher than the set temperature, the controller automatically controls the air conditioner to operate in the forced cooling mode to achieve cooling in an ultra-high temperature environment or to improve the cooling capacity of the air conditioner. That is, when the air conditioner is operating in the forced cooling mode, the first control valve on at least one group of the second heat exchange pipelines is controlled to be closed, and the second control valve on at least one group of the second heat exchange pipelines is controlled to be closed, so that the refrigerant flowing into the outdoor heat exchanger cannot flow in from the inlet of the second heat exchange pipeline, thereby changing the flow direction of the refrigerant in at least one group of the second heat exchange pipelines.

[0075] Step S7, controlling the switch states of the third control valve and according to the target cooling temperature and the indoor air outlet temperature, so as to make at least one group of heat exchange pipelines, the strong cooling pipeline and the return pipeline conductive.

[0076] Specifically, due to limitations such as maximum working pressure and maximum exhaust temperature, existing air conditioners are unable to perform cooling under ultra-high outdoor ambient temperatures, or their cooling capacity is very poor under ultra-high outdoor ambient temperatures, so that the indoor air outlet temperature is high and the user experience is poor. In order to solve this problem, the air conditioner in the present application adds two pipelines from the outdoor heat exchanger, one is a forced cooling pipeline connected to the inlet of each group of second heat exchange pipelines to the outlet of each group of heat exchange pipelines, and the other is a return pipeline connected to the four-way valve from the outlet of each group of second heat exchange pipelines. When the air conditioner is in the forced cooling mode, the first control valve on at least one group of second heat exchange pipelines is controlled to be closed, and the second control valve on at least one group of second heat exchange pipelines is controlled to be closed, so that the refrigerant flowing into the outdoor heat exchanger no longer flows in from the inlet of the second heat exchange pipeline, thereby changing the flow direction of the refrigerant in at least one group of second heat exchange pipelines. At the same time, the actual cooling capacity of the air conditioner is judged by the target cooling temperature and the indoor air outlet temperature, thereby achieving a good cooling effect. The actual cooling capacity of the air conditioner is combined to control the switching state of the third control valve and, wherein the opening degree of the third control valve and can be fully open or partially open, without restriction, so that at least one group of heat exchange pipelines, forced cooling pipelines and return pipelines are connected, that is, according to the actual cooling capacity of the air conditioner, part of the second heat exchange pipeline or all the heat exchange pipelines are controlled to be connected with the forced cooling pipeline and the return pipeline. Therefore, the refrigerant after cooling down flowing into the first heat exchange pipeline of the N group flows into the second heat exchange pipeline of the M group through the forced cooling pipeline to absorb heat to improve the outdoor ultra-high temperature environment, that is, the low-temperature liquid refrigerant flows into the second heat exchange pipeline of the M group through the forced cooling pipeline to absorb heat, so that the ambient temperature around the outdoor unit is reduced, so that when the high-temperature and high-pressure refrigerant continuously flows into multiple groups of first heat exchange pipelines, it can exchange heat with the outdoor environment to a greater extent, and then the refrigerant temperature can be reduced to a greater extent. Therefore, refrigeration is achieved in an ultra-high temperature environment or the refrigeration capacity of the air conditioner is improved, thereby improving user experience. In addition, the air conditioner in the present application can judge the actual cooling capacity of the air conditioner based on the target cooling temperature and the indoor air outlet temperature, and partially or fully connect the second heat exchange pipeline with the strong cooling pipeline and the return pipeline in combination with the actual cooling capacity of the air conditioner, so as to adaptively adjust the cooling effect of the air conditioner.

[0077] Specifically, when the air conditioner is in the forced cooling mode, the first control valve on at least one group of second heat exchange pipelines is controlled to be closed, and the second control valve on the at least one group of second heat exchange pipelines is controlled to be closed, and the third control valve and the switch state are controlled according to the target cooling temperature and the indoor air outlet temperature, so that the at least one group of heat exchange pipelines, the forced cooling pipeline and the return pipeline are connected. That is to say, the high-temperature and high-pressure refrigerant discharged from the compressor flows into the outdoor heat exchanger through the D and C valve ports of the four-way valve. At this time, due to the first control valve on at least one group of second heat exchange pipelines The control valve is closed and the refrigerant cannot flow through, so the high-temperature and high-pressure refrigerant flowing into the outdoor heat exchanger only flows into the inlet of the N groups of first heat exchange pipelines. The high-temperature and high-pressure refrigerant is cooled into low-temperature and high-pressure refrigerant through the N groups of first heat exchange pipelines. A part of the low-temperature and high-pressure refrigerant flows into the throttling device from the outlet of each group of first heat exchange pipelines, and after being throttled by the throttling device, it flows into the indoor heat exchanger to exchange heat with the indoor environment, thereby reducing the indoor temperature. Since at least one group of heat exchange pipelines, the strong cooling pipeline and the return pipeline are connected, that is, at least one group of first heat exchange pipelines and the strong cooling pipeline are connected, The forced cooling pipeline is connected to at least one group of second heat exchange pipelines, and the return pipeline is connected to at least one group of second heat exchange pipelines. Therefore, another part of the low-temperature and high-pressure refrigerant is throttled into a low-temperature liquid refrigerant through the third control valve and then flows into the forced cooling pipeline, and then flows into the M groups of second heat exchange pipelines from the forced cooling pipeline. The low-temperature liquid refrigerant in each group of second heat exchange pipelines evaporates and absorbs heat to form a high-temperature gaseous refrigerant, so that the ambient temperature around the outdoor unit is reduced. The high-temperature gaseous refrigerant after absorbing heat flows into the four-way valve through the return pipeline, and then flows into the vapor-liquid separator from the E valve port and the S valve port of the four-way valve. , the refrigerant is separated into vapor and liquid by the vapor-liquid separator and then flows back to the compressor, so that when the high-temperature and high-pressure refrigerant continuously flows into the first heat exchange pipeline of group N, it can exchange heat with the outdoor environment to a greater extent, thereby reducing the refrigerant temperature to a greater extent. Therefore, the refrigerant flows in the above manner, and continuously reduces the temperature of the refrigerant flowing into the indoor heat exchanger by reducing the ambient temperature of the outdoor unit to improve the indoor air outlet comfort, and the operating frequency of the compressor is increased after the temperature of the entire system is reduced, thereby achieving refrigeration in an ultra-high temperature environment or improving the refrigeration capacity of the air conditioner, improving the user experience. In addition, the air conditioner in the present application can judge the actual refrigeration capacity of the air conditioner by the target refrigeration temperature and the indoor air outlet temperature, so as to partially or completely connect the second heat exchange pipeline with the strong cooling pipeline and the return pipeline in combination with the actual refrigeration capacity of the air conditioner, thereby adaptively adjusting the refrigeration effect of the air conditioner.

[0078] According to the control method of the air conditioner of the embodiment of the present invention, by adding a strong cooling pipeline and a return pipeline, when operating the strong cooling mode in an ultra-high temperature environment, the first control valve and the second control valve on at least one group of second heat exchange pipelines are controlled to be closed, and the third control valve and the conduction are controlled so that at least one group of first heat exchange pipelines are connected with the strong cooling pipeline, and the strong cooling pipeline is connected with at least one group of second heat exchange pipelines, and the return pipeline is connected with at least one group of second heat exchange pipelines, so that the outdoor environment temperature is reduced through the second heat exchange pipeline, so that when the high-temperature and high-pressure refrigerant continuously flows into the multiple groups of first heat exchange pipelines, it can exchange heat with the outdoor environment to a greater extent, so that the refrigerant temperature can be reduced to a greater extent, thereby achieving refrigeration in an ultra-high temperature environment or improving the refrigeration capacity of the air conditioner, and improving the user experience. In addition, the air conditioner in the present application can judge the actual refrigeration capacity of the air conditioner by the target refrigeration temperature and the indoor air outlet temperature, so as to partially or completely connect the second heat exchange pipeline with the strong cooling pipeline and the return pipeline in combination with the actual refrigeration capacity of the air conditioner, so as to adaptively adjust the refrigeration effect of the air conditioner.

[0079] In some embodiments, in the normal cooling mode, the third control valve and are controlled to be closed; each first control valve and each second control valve are controlled to be opened.

[0080] Specifically, when the air conditioner is running in normal cooling mode, the third control valve and are controlled to be closed, and each first control valve and each second control valve are controlled to be open, and the high-temperature and high-pressure refrigerant discharged from the compressor flows into each first heat exchange pipeline and each second heat exchange pipeline through the D and C valve ports of the four-way valve, and the high-temperature and high-pressure refrigerant is cooled into low-temperature and high-pressure refrigerant through all the first heat exchange pipelines and the second heat exchange pipelines, and flows into the throttling device from the outlet of each group of first heat exchange pipelines and second heat exchange pipelines, and flows into the indoor heat exchanger after throttling by the throttling device to exchange heat with the indoor environment, thereby reducing the indoor temperature, and the refrigerant flowing out of the indoor heat exchanger flows back to the vapor-liquid separator through the E valve and S valve ports of the four-way valve, and flows back to the compressor after the refrigerant is separated into vapor and liquid by the vapor-liquid separator, thereby realizing the normal cooling mode.

[0081] In some embodiments, in the heating mode, it is determined that the air conditioner meets the defrost conditions; the first control valve on at least one group of second heat exchange pipelines is controlled to be closed, and the second control valve on at least one group of second heat exchange pipelines is controlled to be closed; the switching state of the third control valve and is controlled according to the outdoor ambient temperature and the outdoor coil temperature to make at least one group of heat exchange pipelines, the forced cooling pipeline and the return pipeline conductive.

[0082] Specifically, when the air conditioner is running in heating mode, the present application determines the degree of frost of the air conditioner by using the outdoor ambient temperature and the outdoor coil temperature. If the outdoor ambient temperature and the outdoor coil temperature differ greatly, it means that the degree of frost of the air conditioner is low at this time. If the outdoor ambient temperature and the outdoor coil temperature differ little, it means that the degree of frost of the air conditioner is low at this time. Therefore, the air conditioner in the present application can determine the degree of frost of the air conditioner by using the outdoor ambient temperature and the outdoor coil temperature, and partially or completely connect the second heat exchange pipeline with the strong cooling pipeline and the return pipeline in combination with the degree of frost of the air conditioner, so as to adjust the refrigerant That is to say, the air conditioner automatically calculates the difference between the outdoor ambient temperature and the outdoor coil temperature, and then presets different difference ranges according to the difference between the outdoor ambient temperature and the outdoor coil temperature and sets the number of conductive return branches and strong cooling branches corresponding to the difference range. If the difference between the outdoor ambient temperature and the outdoor coil temperature is large, that is, the difference falls into a larger difference range, then the number of conductive return branches and strong cooling branches is large. Thus, the number of conductive return branches and strong cooling branches is determined by the difference between the outdoor ambient temperature and the outdoor coil temperature. For example, if the conductive return branch If the number of the a-way and strong cooling branches is a, the third control valves on a strong cooling branches are controlled to be turned on and the third control valves on the remaining Ma strong cooling branches are controlled to be turned off, and the fourth control valves on the return branches corresponding to the a-way strong cooling branches that are turned on by the third control valve are controlled to be turned on, and the fourth control valves on the remaining Ma return branches are controlled to be turned off, so that the high-temperature and high-pressure refrigerant flowing out of the compressor flows into the a-way return branches through the four-way valve and the second main line, and then flows into the corresponding second heat exchange pipeline through the a-way return branches, and the high-temperature liquid refrigerant in the second heat exchange pipeline releases heat, so that the ambient temperature around the outdoor unit is reduced. The degree is increased, and then flows from the outlet of each group of second heat exchange pipelines into the corresponding strong cooling branch, flows from the strong cooling branch into the first main pipeline, and then flows back to the compressor from the second main pipeline, the four-way valve and the vapor-liquid separator. Therefore, in the present application, a control valve is set in each strong cooling branch and each return branch to connect or cut off each strong cooling branch and each return branch, so that the number of connected strong cooling branches and return branches can be determined in combination with the frosting degree of the air conditioner, so as to adjust the degree of lowering the outdoor ambient temperature by changing the number of pipelines through which the refrigerant flows in the second heat exchange pipeline, thereby adaptively adjusting the defrosting effect of the air conditioner.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0084] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: The refrigerant circulation loop allows the refrigerant to circulate in a loop consisting of a vapor-liquid separator, a compressor, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and a four-way valve; The outdoor heat exchanger includes multiple groups of heat exchange pipelines, the multiple groups of heat exchange pipelines include N groups of first heat exchange pipelines and M groups of second heat exchange pipelines, the inlet of each group of first heat exchange pipelines is directly connected to the four-way valve, the outlet of each group of first heat exchange pipelines is directly connected to the throttling device, the inlet of each group of second heat exchange pipelines is connected to the four-way valve through a first control valve, and the outlet of each group of second heat exchange pipelines is connected to the throttling device through a second control valve, wherein N≥1, M≥1; A forced cooling pipeline, wherein a first end of the forced cooling pipeline is connected to an outlet of each group of heat exchange pipelines, and a second end of the forced cooling pipeline is connected to an inlet of each group of second heat exchange pipelines; A third control valve, the third control valve is arranged on the strong cooling pipeline to open or close the strong cooling pipeline; A reflux pipeline, wherein a first end of the reflux pipeline is connected to an outlet of each group of second heat exchange pipelines, and a second end of the reflux pipeline is connected to the four-way valve; a fourth control valve, the fourth control valve being arranged on the return line to open or close the return line; A controller, wherein the controller is connected to the first control valve, the second control valve, the third control valve and the fourth control valve respectively, and the controller is configured as follows: In the forced cooling mode, the first control valve on at least one group of second heat exchange pipelines is controlled to be closed, and the second control valve on the at least one group of second heat exchange pipelines is controlled to be closed; The switching states of the third control valve and the fourth control valve are controlled according to the target cooling temperature and the indoor air outlet temperature, so that the at least one group of heat exchange pipelines, the strong cooling pipeline and the return pipeline are connected.

2. The air conditioner according to claim 1, characterized in that: The strong cooling pipeline comprises: A first main pipeline and M strong cooling branches, wherein the inlet of the first main pipeline is connected to the outlet of each group of heat exchange pipelines, the inlet of each strong cooling branch is connected to the first main pipeline, and the outlet of each strong cooling branch is connected to the inlet of each group of second heat exchange pipelines; There is one third control valve, and the third control valve is arranged on the first main line. The third control valve is used to simultaneously open or close all the strong cooling branches.

3. The air conditioner according to claim 2, characterized in that: The return line comprises: A second main pipeline and M return branches, the outlet of the second main pipeline is connected to the four-way valve, the inlet of each return branch is connected to the outlet of each group of second heat exchange pipelines, and the outlet of each strong cooling branch is connected to the second main pipeline; There is one fourth control valve, and the fourth control valve is arranged on the second main line. The fourth control valve is used to simultaneously open or close all reflux branches.

4. The air conditioner according to claim 1, characterized in that: The strong cooling pipeline comprises: A first main pipeline and M strong cooling branches, wherein the inlet of the first main pipeline is connected to the outlet of each group of heat exchange pipelines, the inlet of each strong cooling branch is connected to the first main pipeline, and the outlet of each strong cooling branch is connected to the inlet of each group of second heat exchange pipelines; There are M third control valves, and each third control valve is correspondingly arranged on each strong cooling branch. The third control valve is used to open or close the corresponding strong cooling branch.

5. The air conditioner according to claim 4, characterized in that: The return line comprises: A second main pipeline and M return branches, the outlet of the second main pipeline is connected to the four-way valve, the inlet of each return branch is connected to the outlet of each group of second heat exchange pipelines, and the outlet of each strong cooling branch is connected to the second main pipeline; The number of the fourth control valves is M, and each fourth control valve is correspondingly arranged on each reflux branch, and the fourth control valve is used to open or close the corresponding reflux branch.

6. The air conditioner according to any one of claims 1 to 5, characterized in that: The controller is also configured to: In the normal cooling mode, the third control valve and the fourth control valve are controlled to be closed; Each of the first control valves and each of the second control valves are controlled to be open.

7. The air conditioner according to any one of claims 1 to 5, characterized in that: The controller is also configured to: In the heating mode, determining that the air conditioner meets the defrosting condition; Controlling the first control valve on at least one group of second heat exchange pipelines to close, and controlling the second control valve on the at least one group of second heat exchange pipelines to close; The switch states of the third control valve and the fourth control valve are controlled according to the outdoor ambient temperature and the outdoor coil temperature, so that the at least one group of heat exchange pipelines, the strong cooling pipeline and the return pipeline are connected.

8. A method for controlling an air conditioner, characterized in that: For the air conditioner according to any one of claims 1 to 7, the control method comprises: In the forced cooling mode, the first control valve on at least one group of second heat exchange pipelines is controlled to be closed, and the second control valve on the at least one group of second heat exchange pipelines is controlled to be closed; The switching states of the third control valve and the fourth control valve are controlled according to the target cooling temperature and the indoor air outlet temperature, so that the at least one group of heat exchange pipelines, the strong cooling pipeline and the return pipeline are connected.

9. The air conditioner control method according to claim 8, characterized in that: The control method further comprises: In the normal cooling mode, the third control valve and the fourth control valve are controlled to be closed; Each of the first control valves and each of the second control valves are controlled to be open.

10. The air conditioner control method according to claim 8, characterized in that: The control method further comprises: In the heating mode, determining that the air conditioner meets the defrosting condition; Controlling the first control valve on at least one group of second heat exchange pipelines to close, and controlling the second control valve on the at least one group of second heat exchange pipelines to close; The switch states of the third control valve and the fourth control valve are controlled according to the outdoor ambient temperature and the outdoor coil temperature, so that the at least one group of heat exchange pipelines, the strong cooling pipeline and the return pipeline are connected.

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