Air conditioner and control method thereof

Abstract

The invention provides an air conditioner and a control method thereof.The air conditioner comprises a compressor, a four-way reversing valve, an indoor heat exchanger, an outdoor heat exchanger, a first control valve, a second control valve and a first bypass branch, the compressor communicates with the indoor heat exchanger through the four-way reversing valve, and the indoor heat exchanger communicates with the outdoor heat exchanger; the outdoor heat exchanger is communicated with the four-way reversing valve through a fourth flow path, the four-way reversing valve is communicated with the compressor through a fifth flow path, the two ends of the first bypass branch are communicated between the fourth flow path and the fifth flow path respectively, the first control valve is arranged on the first bypass branch, and the second control valve is arranged on a circulation branch section of the fourth flow path. The circulation branch section is located between the third port of the four-way reversing valve and the first bypass branch. According to the air conditioner, the heat exchange loss phenomenon at the position of the four-way reversing valve can be avoided, so that the purpose of rapid heating at the heating operation starting stage is achieved, the heating efficiency is improved, and then the use experience of a user 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 of the air conditioner. Background Art

[0002] See also Figure 1 When the existing air conditioner is in heating operation, the relatively high temperature refrigerant compressed by the compressor 11 flows to the indoor heat exchanger 15 through the four-way reversing valve 12, condenses in the indoor heat exchanger 15, and releases heat to the indoor environment. The condensed refrigerant flows into the outdoor heat exchanger 13 after throttling and reducing the pressure by the electronic expansion valve 14. The relatively low temperature and low pressure refrigerant evaporates in the outdoor heat exchanger 13 to absorb heat from the outdoor environment. The evaporated refrigerant flows back to the compressor 11 through the four-way reversing valve 12, thereby completing the entire heating cycle.

[0003] However, in the existing air conditioner, during the heating operation cycle, both the refrigerant flow paths from the compressor 11 to the indoor heat exchanger 15 and from the outdoor heat exchanger 13 back to the compressor 11 need to pass through the four-way reversing valve 12. The temperature and pressure of the refrigerant flowing out of the compressor 11 are higher than the refrigerant flowing into the compressor 11. The two refrigerants in different thermal states will undergo heat exchange through the valve core, shell and other components of the four-way reversing valve 12. This heat exchange causes the temperature of the refrigerant flowing to the indoor heat exchanger 15 through the four-way reversing valve 12 to decrease, thereby reducing the heating efficiency of the air conditioner. In particular, in the start-up stage of the heating operation, the heat exchange loss at the four-way reversing valve 12 causes the temperature of the indoor heat exchanger 15 to rise slowly, which is not conducive to achieving the purpose of rapid heating when the air conditioner is turned on for heating operation, thereby affecting the user experience. Summary of the invention

[0004] The first object of the present invention is to provide an air conditioner that can avoid the heat exchange loss phenomenon at the four-way reversing valve, thereby achieving the purpose of rapid heating when the heating operation stage is started, thereby improving the heating efficiency and further improving the user experience.

[0005] A second object of the present invention is to provide a control method for the above air conditioner.

[0006] In order to achieve the first purpose of the present invention, the present invention provides an air conditioner, including a compressor, a four-way reversing valve, an indoor heat exchanger, an outdoor heat exchanger, a first control valve, a second control valve and a first bypass branch, the outlet end of the compressor is connected to the first port of the four-way reversing valve through the first flow path, the second port of the four-way reversing valve is connected to the first port of the indoor heat exchanger through the second flow path, the second port of the indoor heat exchanger is connected to the first port of the outdoor heat exchanger through the third flow path, the second port of the outdoor heat exchanger is connected to the third port of the four-way reversing valve through the fourth flow path, the fourth port of the four-way reversing valve is connected to the inlet end of the compressor through the fifth flow path, the two ends of the first bypass branch are respectively connected between the fourth flow path and the fifth flow path, the first control valve is arranged on the first bypass branch to open or close the first bypass branch, the second control valve is arranged on the flow branch section of the fourth flow path to open or close the flow branch section, and the flow branch section is located between the third port of the four-way reversing valve and the first bypass branch.

[0007] A preferred solution is that the first control valve is a first solenoid valve; and / or the second control valve is a second solenoid valve.

[0008] A further solution is that the air conditioner further includes a first electronic expansion valve, and the first electronic expansion valve is arranged on the third flow path.

[0009] It can be seen from the above scheme that when the air conditioner of the present invention is turned on for heating operation, in order to achieve the purpose of rapid heating, the air conditioner of the present invention can be controlled to perform rapid heating mode operation, that is, the first control valve of the air conditioner of the present invention is controlled to be opened, and the second control valve of the air conditioner of the present invention is controlled to be closed, so that the second port of the outdoor heat exchanger is connected to the inlet end of the compressor through the first bypass branch, and the first port of the four-way reversing valve of the air conditioner of the present invention is controlled to be connected to the second port of the four-way reversing valve, so that the outlet end of the compressor is connected to the first port of the indoor heat exchanger through the four-way reversing valve. Therefore, during the rapid heating mode operation of the air conditioner of the present invention, the higher temperature refrigerant compressed by the compressor flows to the indoor heat exchanger through the first port and the second port of the four-way reversing valve, condenses in the indoor heat exchanger, releases heat to the indoor environment, and the condensed refrigerant flows into the outdoor heat exchanger through the third flow path, and the lower temperature and lower pressure refrigerant evaporates in the outdoor heat exchanger to absorb heat from the outdoor environment. The evaporated refrigerant will flow back to the compressor through the first bypass branch, thereby completing the heating cycle.

[0010] Compared with the existing air conditioner which has heat exchange loss at the four-way reversing valve during the heating operation cycle, in the air conditioner of the present invention, when executing the rapid heating mode operation, the higher temperature refrigerant compressed by the compressor flows to the indoor heat exchanger through the four-way reversing valve, and at the same time the refrigerant after evaporation in the outdoor heat exchanger flows back to the compressor through the first bypass branch, so as to separate the refrigerants in two different thermal states into two flow paths without crossing positions for circulation, which can avoid the heat exchange loss phenomenon at the four-way reversing valve, thereby shortening the time for the indoor heat exchanger temperature to rise from the indoor ambient temperature to the preset temperature, and achieving the purpose of rapid heating when the heating operation is started, so as to improve the heating efficiency and further improve the user experience.

[0011] When the air conditioner of the present invention executes the rapid heating mode so that the indoor ambient temperature approaches the preset temperature, in order to improve the heating stability of the air conditioner of the present invention, the air conditioner of the present invention can be switched to the normal heating mode, that is, the first control valve of the air conditioner of the present invention is controlled to be closed, and the second control valve of the air conditioner of the present invention is controlled to be opened, and the third port of the four-way reversing valve of the air conditioner of the present invention is controlled to be connected with the fourth port of the four-way reversing valve, so that the second port of the outdoor heat exchanger is connected with the inlet end of the compressor through the four-way reversing valve. Therefore, during the operation of the air conditioner of the present invention in the ordinary heating mode, the refrigerant compressed by the compressor flows to the indoor heat exchanger through the first port and the second port of the four-way reversing valve, condenses in the indoor heat exchanger, and releases heat to the indoor environment. The condensed refrigerant flows into the outdoor heat exchanger through the third flow path to evaporate and absorb heat from the outdoor environment. The evaporated refrigerant flows back to the compressor through the third port and the fourth port of the four-way reversing valve. At this time, the first bypass branch is closed by the first control valve, thereby avoiding the added first bypass branch from affecting the smooth operation stage of heating, thereby ensuring the heating stability of the air conditioner.

[0012] In order to achieve the second purpose of the present invention, the present invention provides a control method for an air conditioner, the air conditioner is the above-mentioned air conditioner, and the control method includes: controlling the air conditioner to perform a rapid heating mode operation; the rapid heating mode includes: controlling the first control valve to open and controlling the second control valve to close, so that the second port of the outdoor heat exchanger is connected to the inlet end of the compressor through the first bypass branch, and controlling the first port of the four-way reversing valve to be connected to the second port of the four-way reversing valve, so that the outlet end of the compressor is connected to the first port of the indoor heat exchanger through the four-way reversing valve.

[0013] A further solution is that the control method also includes: after the air conditioner executes the rapid heating mode, determining whether the heating air outlet temperature sent into the room by the air conditioner is greater than a preset temperature, and if so, controlling the air conditioner to execute the normal heating mode; the normal heating mode includes: controlling the first control valve to close and controlling the second control valve to open, and controlling the third port of the four-way reversing valve to be connected with the fourth port of the four-way reversing valve, so that the second port of the outdoor heat exchanger is connected to the inlet end of the compressor through the four-way reversing valve.

[0014] In order to achieve the first purpose of the present invention, the present invention provides an air conditioner, including a compressor, a four-way reversing valve, an indoor heat exchanger, an outdoor heat exchanger, a third control valve, a fourth control valve and a second bypass branch, the outlet end of the compressor is connected to the first port of the four-way reversing valve through a first flow path, the second port of the four-way reversing valve is connected to the first port of the indoor heat exchanger through a second flow path, the second port of the indoor heat exchanger is connected to the first port of the outdoor heat exchanger through a third flow path, the second port of the outdoor heat exchanger is connected to the third port of the four-way reversing valve through a fourth flow path, the fourth port of the four-way reversing valve is connected to the inlet end of the compressor through a fifth flow path, the two ends of the second bypass branch are respectively connected between the first flow path and the second flow path, the third control valve is arranged on the second bypass branch to open or close the second bypass branch, the fourth control valve is arranged on the flow branch section of the first flow path to open or close the flow branch section, and the flow branch section is located between the first port of the four-way reversing valve and the second bypass branch.

[0015] A further solution is that the third control valve is a third solenoid valve; and / or the fourth control valve is a fourth solenoid valve.

[0016] A further solution is that the air conditioner further includes a second electronic expansion valve, and the second electronic expansion valve is arranged on the third flow path.

[0017] It can be seen from the above scheme that when the air conditioner of the present invention is turned on for heating operation, in order to achieve the purpose of rapid heating, the air conditioner of the present invention can be controlled to perform rapid heating mode operation, that is, the third control valve of the air conditioner of the present invention is controlled to be opened, and the fourth control valve of the air conditioner of the present invention is controlled to be closed, so that the outlet end of the compressor is connected to the first port of the indoor heat exchanger through the second bypass branch, and the third port of the four-way reversing valve of the air conditioner of the present invention is controlled to be connected to the fourth port of the four-way reversing valve, so that the second port of the outdoor heat exchanger is connected to the inlet end of the compressor through the four-way reversing valve. Therefore, during the rapid heating mode operation of the air conditioner of the present invention, the higher temperature refrigerant compressed by the compressor flows to the indoor heat exchanger through the second bypass branch, condenses in the indoor heat exchanger, and releases heat to the indoor environment. The condensed refrigerant flows into the outdoor heat exchanger through the third flow path, and the lower temperature and lower pressure refrigerant evaporates in the outdoor heat exchanger to absorb heat from the outdoor environment. The evaporated refrigerant will flow back to the compressor through the third and fourth ports of the four-way reversing valve, thereby completing the heating cycle.

[0018] Compared with the existing air conditioner which has heat exchange loss at the four-way reversing valve during the heating operation cycle, in the air conditioner of the present invention, when executing the rapid heating mode operation, the higher temperature refrigerant compressed by the compressor flows to the indoor heat exchanger through the second bypass branch, and at the same time the refrigerant after evaporation in the outdoor heat exchanger flows back to the compressor through the four-way reversing valve, so as to separate the refrigerants in two different thermal states into two flow paths without crossing positions for circulation, which can avoid the heat exchange loss phenomenon at the four-way reversing valve, thereby shortening the time for the indoor heat exchanger temperature to rise from the indoor ambient temperature to the preset temperature, and achieving the purpose of rapid heating when the heating operation is started, so as to improve the heating efficiency and further improve the user experience.

[0019] When the air conditioner of the present invention performs the rapid heating mode operation so that the indoor environment temperature approaches the preset temperature, in order to improve the heating stability of the air conditioner of the present invention, the air conditioner of the present invention can be switched to perform the normal heating mode, that is, the third control valve of the air conditioner of the present invention is controlled to be closed, and the fourth control valve of the air conditioner of the present invention is controlled to be opened, and the first port of the four-way reversing valve of the air conditioner of the present invention is controlled to be connected with the second port of the four-way reversing valve, so that the outlet end of the compressor is connected with the first port of the indoor heat exchanger through the four-way reversing valve. Therefore, during the operation of the air conditioner of the present invention in the normal heating mode, the refrigerant compressed by the compressor flows to the indoor heat exchanger through the first port and the second port of the four-way reversing valve, condenses in the indoor heat exchanger, releases heat to the indoor environment, and the condensed refrigerant flows into the outdoor heat exchanger through the third flow path to evaporate, so as to absorb heat from the outdoor environment, and the evaporated refrigerant will flow back to the compressor through the third port and the fourth port of the four-way reversing valve, and the second bypass branch is closed by the third control valve, so as to avoid the influence of the added second bypass branch on the stable operation stage of heating, thereby ensuring the heating stability of the air conditioner.

[0020] In order to achieve the second purpose of the present invention, the present invention provides a control method for an air conditioner, the air conditioner is the above-mentioned air conditioner, and the control method includes: controlling the air conditioner to perform rapid heating mode operation; the rapid heating mode includes: controlling the third control valve to open and controlling the fourth control valve to close, so that the outlet end of the compressor is connected to the first port of the indoor heat exchanger through the second bypass branch, and controlling the third port of the four-way reversing valve to be connected to the fourth port of the four-way reversing valve, so that the second port of the outdoor heat exchanger is connected to the inlet end of the compressor through the four-way reversing valve.

[0021] A further solution is that the control method also includes: after the air conditioner executes the rapid heating mode, determining whether the heating air outlet temperature sent into the room by the air conditioner is greater than a preset temperature, and if so, controlling the air conditioner to execute the normal heating mode; the normal heating mode includes: controlling the third control valve to close and controlling the fourth control valve to open, and controlling the first port of the four-way reversing valve to be connected with the second port of the four-way reversing valve, so that the outlet end of the compressor is connected to the first port of the indoor heat exchanger through the four-way reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a refrigerant circuit of an existing air conditioner.

[0023] Figure 2 Schematic diagram of a refrigerant circuit of a first embodiment of an air conditioner of the present invention.

[0024] Figure 3 FIG. 1 is a flow chart of a first embodiment of a method for controlling an air conditioner according to the present invention.

[0025] Figure 4 Schematic diagram of a refrigerant circuit of a second embodiment of an air conditioner of the present invention.

[0026] Figure 5 4 is a flow chart of a second embodiment of a method for controlling an air conditioner according to the present invention.

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0028] The first embodiment of the air conditioner:

[0029] See also Figure 2 The present embodiment discloses an air conditioner, comprising a compressor 21, a four-way reversing valve 22, an indoor heat exchanger 25, an outdoor heat exchanger 23, a first control valve 27, a second control valve 26 and a first bypass branch 28, wherein the outlet end of the compressor 21 is connected to the first port of the four-way reversing valve 22 through a first flow path, the second port of the four-way reversing valve 22 is connected to the first port of the indoor heat exchanger 25 through a second flow path, the second port of the indoor heat exchanger 25 is connected to the first port of the outdoor heat exchanger 23 through a third flow path, the second port of the outdoor heat exchanger 23 is connected to the third port of the four-way reversing valve 22 through a fourth flow path, and the fourth port of the four-way reversing valve 22 is connected to the inlet end of the compressor 21 through a fifth flow path. In addition, in this embodiment, both ends of the first bypass branch 28 are respectively connected between the fourth flow path and the fifth flow path, the first control valve 27 is arranged on the first bypass branch 28 to open or close the first bypass branch 28, and the second control valve 26 is arranged on the flow branch section of the fourth flow path to open or close the flow branch section, and the flow branch section is located between the third port of the four-way reversing valve 22 and the first bypass branch 28.

[0030] When the air conditioner of the present embodiment is in the heating operation stage, in order to achieve the purpose of rapid heating, the air conditioner of the present embodiment can be controlled to perform rapid heating mode operation, that is, the first control valve 27 of the air conditioner of the present embodiment is controlled to open, and the second control valve 26 of the air conditioner of the present embodiment is controlled to close, so that the second port of the outdoor heat exchanger 23 is connected to the inlet end of the compressor 21 through the first bypass branch 28, and at the same time, the first port of the four-way reversing valve 22 of the air conditioner of the present embodiment is controlled to be connected to the second port of the four-way reversing valve 22, so that the outlet end of the compressor 21 is connected to the first port of the indoor heat exchanger 25 through the four-way reversing valve 22. Therefore, during the operation of the air conditioner in the rapid heating mode, the relatively high temperature refrigerant compressed by the compressor 21 flows to the indoor heat exchanger 25 through the first port and the second port of the four-way reversing valve 22, condenses in the indoor heat exchanger 25, and releases heat to the indoor environment. The condensed refrigerant flows into the outdoor heat exchanger 23 through the third flow path, and the relatively low temperature and low pressure refrigerant evaporates in the outdoor heat exchanger 23 to absorb heat from the outdoor environment. The evaporated refrigerant flows back to the compressor 21 through the first bypass branch 28, thereby completing the heating cycle.

[0031] Compared with the existing air conditioner which has heat exchange loss at the four-way reversing valve 22 during the heating operation cycle, in the air conditioner of this embodiment, when executing the rapid heating mode operation, the higher temperature refrigerant compressed by the compressor 21 flows to the indoor heat exchanger 25 through the four-way reversing valve 22, and at the same time, the refrigerant after evaporation through the outdoor heat exchanger 23 flows back to the compressor 21 through the first bypass branch 28, so as to separate the refrigerants in two different thermal states into two flow paths without crossing positions for circulation, which can avoid the heat exchange loss phenomenon at the four-way reversing valve 22, thereby shortening the time for the temperature of the indoor heat exchanger 25 to rise from the indoor ambient temperature to the preset temperature, and achieving the purpose of rapid heating when the heating operation is started, so as to improve the heating efficiency and further improve the user experience.

[0032] When the air conditioner of this embodiment executes the rapid heating mode so that the indoor ambient temperature approaches the preset temperature, in order to improve the heating stability of the air conditioner of this embodiment, the air conditioner of this embodiment can be switched to the normal heating mode, that is, the first control valve 27 of the air conditioner of this embodiment is controlled to be closed, and the second control valve 26 of the air conditioner of this embodiment is controlled to be opened, and the third port of the four-way reversing valve 22 of the air conditioner of this embodiment is controlled to be connected with the fourth port of the four-way reversing valve 22, so that the second port of the outdoor heat exchanger 23 is connected with the inlet end of the compressor 21 through the four-way reversing valve 22. Therefore, during the operation of the air conditioner in the ordinary heating mode, the refrigerant compressed by the compressor 21 flows to the indoor heat exchanger 25 through the first port and the second port of the four-way reversing valve 22, condenses in the indoor heat exchanger 25, and releases heat to the indoor environment. The condensed refrigerant flows into the outdoor heat exchanger 23 through the third flow path to evaporate and absorb heat from the outdoor environment. The evaporated refrigerant flows back to the compressor 21 through the third port and the fourth port of the four-way reversing valve 22. At this time, the first bypass branch 28 is closed by the first control valve 27, so as to avoid the added first bypass branch 28 from affecting the smooth operation stage of heating, thereby ensuring the heating stability of the air conditioner.

[0033] Specifically, the first control valve 27 of the present embodiment is a first solenoid valve, and the second control valve 26 of the present embodiment is a second solenoid valve.

[0034] In order to improve the operating accuracy, stability and reliability of the air conditioner, the air conditioner in this embodiment also includes a first electronic expansion valve 24. The first electronic expansion valve 24 is arranged on the third flow path and is used to adjust and control the refrigerant flow in the third flow path to achieve precise control.

[0035] The first embodiment of the control method of the air conditioner:

[0036] The control method of the air conditioner of this embodiment is the control method of the air conditioner of the first embodiment mentioned above. Figure 3 The specific steps of the air conditioner control method of this embodiment are as follows.

[0037] The control method of the air conditioner in this embodiment first executes step S11, and the air conditioner executes a power-on instruction, that is, the user sends a power-on instruction to the air conditioner through the remote controller, and the air conditioner executes the power-on instruction to start operation after receiving the power-on instruction.

[0038] Then, step S12 is executed to determine that the air conditioner executes the rapid heating mode operation, that is, the user sends a rapid heating mode command to the air conditioner through the remote control, so that the air conditioner enters the rapid heating mode operation after receiving the rapid heating mode command, and then step S13 is executed to control the first control valve 27 to open and the second control valve 26 to close, so that the second port of the outdoor heat exchanger 23 is connected to the inlet end of the compressor 21 through the first bypass branch 28, and the first port of the four-way reversing valve 22 is controlled to be connected to the second port of the four-way reversing valve 22, so that the outlet end of the compressor 21 is connected to the first port of the indoor heat exchanger 25 through the four-way reversing valve 22. That is, in the process of the air conditioner in this embodiment executing the rapid heating mode operation, the higher temperature refrigerant compressed by the compressor 21 flows to the indoor heat exchanger 25 through the first port and the second port of the four-way reversing valve 22, and the indoor heat exchanger 25 The refrigerant with a lower temperature and lower pressure evaporates in the outdoor heat exchanger 23 to absorb heat from the outdoor environment. The evaporated refrigerant flows back to the compressor 21 through the first bypass branch 28, thereby completing the heating cycle. The higher-temperature refrigerant compressed by the compressor 21 flows to the indoor heat exchanger 25 through the four-way reversing valve 22. At the same time, the refrigerant evaporated through the outdoor heat exchanger 23 flows back to the compressor 21 through the first bypass branch 28, so as to separate the refrigerants in two different thermal states into two flow paths without crossing positions for circulation, thereby avoiding the phenomenon of heat exchange loss at the four-way reversing valve 22, thereby shortening the time for the temperature of the indoor heat exchanger 25 to rise from the indoor environment temperature to the preset temperature, and achieving the purpose of rapid heating when the heating operation is started, so as to improve the heating efficiency and thus improve the user experience.

[0039] After the air conditioner executes the rapid heating mode, step S14 is executed to determine whether the heating air outlet temperature sent into the room by the air conditioner is greater than the preset temperature. If so, step S15 is executed. If not, step S13 is executed to continue the rapid heating mode.

[0040] When it is determined that the temperature of the heating air outlet sent into the room by the air conditioner is greater than the preset temperature, it means that the actual heating effect of the air conditioner has basically reached the preset heating effect, then step S15 is executed to control the air conditioner to perform the normal heating mode operation, and then step S16 is executed to control the first control valve 27 to be closed and the second control valve 26 to be opened, and the third port of the four-way reversing valve 22 is controlled to be connected with the fourth port of the four-way reversing valve 22, so that the second port of the outdoor heat exchanger 23 is connected with the inlet end of the compressor 21 through the four-way reversing valve 22, that is, in this embodiment, the air conditioner performs the normal heating mode operation. During operation, the refrigerant compressed by the compressor 21 flows to the indoor heat exchanger 25 through the first port and the second port of the four-way reversing valve 22, condenses in the indoor heat exchanger 25, and releases heat to the indoor environment. The condensed refrigerant flows into the outdoor heat exchanger 23 through the third flow path to evaporate, so as to absorb heat from the outdoor environment. The evaporated refrigerant will flow back to the compressor 21 through the third port and the fourth port of the four-way reversing valve 22. At this time, the first bypass branch 28 is closed by the first control valve 27, so as to avoid the added first bypass branch 28 from affecting the smooth operation stage of heating, thereby ensuring the heating stability of the air conditioner.

[0041] Air conditioner second embodiment:

[0042] See also Figure 4 The air conditioner of this embodiment includes a compressor 31, a four-way reversing valve 32, an indoor heat exchanger 35, an outdoor heat exchanger 33, a third control valve 37, a fourth control valve 36 and a second bypass branch 38. The outlet end of the compressor 31 is connected to the first port of the four-way reversing valve 32 through a first flow path, the second port of the four-way reversing valve 32 is connected to the first port of the indoor heat exchanger 35 through a second flow path, the second port of the indoor heat exchanger 35 is connected to the first port of the outdoor heat exchanger 33 through a third flow path, the second port of the outdoor heat exchanger 33 is connected to the third port of the four-way reversing valve 32 through a fourth flow path, and the fourth port of the four-way reversing valve 32 is connected to the inlet end of the compressor 31 through a fifth flow path. In addition, in the present embodiment, both ends of the second bypass branch 38 are respectively connected between the first flow path and the second flow path, the third control valve 37 is arranged on the second bypass branch 38 to open or close the second bypass branch 38, and the fourth control valve 36 is arranged on the flow branch section of the first flow path to open or close the flow branch section, and the flow branch section is located between the first port of the four-way reversing valve 32 and the second bypass branch 38.

[0043] When the air conditioner of the present embodiment is in the heating operation stage, in order to achieve the purpose of rapid heating, the air conditioner of the present embodiment can be controlled to perform rapid heating mode operation, that is, the third control valve 37 of the air conditioner of the present embodiment is controlled to open, and the fourth control valve 36 of the air conditioner of the present embodiment is controlled to close, so that the outlet end of the compressor 31 is connected to the first port of the indoor heat exchanger 35 through the second bypass branch 38, and at the same time, the third port of the four-way reversing valve 32 of the air conditioner of the present embodiment is controlled to be connected to the fourth port of the four-way reversing valve 32, so that the second port of the outdoor heat exchanger 33 is connected to the inlet end of the compressor 31 through the four-way reversing valve 32. Therefore, during the operation of the air conditioner in the rapid heating mode, the relatively high temperature refrigerant compressed by the compressor 31 flows to the indoor heat exchanger 35 through the second bypass branch 38, condenses in the indoor heat exchanger 35, and releases heat to the indoor environment. The condensed refrigerant flows into the outdoor heat exchanger 33 through the third flow path, and the relatively low temperature and low pressure refrigerant evaporates in the outdoor heat exchanger 33 to absorb heat from the outdoor environment. The evaporated refrigerant flows back to the compressor 31 through the third port and the fourth port of the four-way reversing valve 32, thereby completing the heating cycle.

[0044] Compared with the existing air conditioner which has heat exchange loss at the four-way reversing valve 32 during the heating operation cycle, in the air conditioner of this embodiment, when executing the rapid heating mode operation, the higher temperature refrigerant compressed by the compressor 31 flows to the indoor heat exchanger 35 through the second bypass branch 38, and at the same time, the refrigerant after evaporation through the outdoor heat exchanger 33 flows back to the compressor 31 through the four-way reversing valve 32, so as to separate the refrigerants in two different thermal states into two flow paths without crossing positions for circulation, which can avoid the heat exchange loss phenomenon at the four-way reversing valve 32, thereby shortening the time for the temperature of the indoor heat exchanger 35 to rise from the indoor ambient temperature to the preset temperature, and achieving the purpose of rapid heating when the heating operation is started, so as to improve the heating efficiency and further improve the user experience.

[0045] When the air conditioner of this embodiment executes the rapid heating mode so that the indoor ambient temperature approaches the preset temperature, in order to improve the heating stability of the air conditioner of this embodiment, the air conditioner of this embodiment can be switched to the normal heating mode, that is, the third control valve 37 of the air conditioner of this embodiment is controlled to be closed, and the fourth control valve 36 of the air conditioner of this embodiment is controlled to be opened, and the first port of the four-way reversing valve 32 of the air conditioner of this embodiment is controlled to be connected with the second port of the four-way reversing valve 32, so that the outlet end of the compressor 31 is connected with the first port of the indoor heat exchanger 35 through the four-way reversing valve 32. Therefore, during the operation of the air conditioner in the ordinary heating mode, the refrigerant compressed by the compressor 31 flows to the indoor heat exchanger 35 through the first port and the second port of the four-way reversing valve 32, condenses in the indoor heat exchanger 35, and releases heat to the indoor environment. The condensed refrigerant flows into the outdoor heat exchanger 33 through the third flow path to evaporate and absorb heat from the outdoor environment. The evaporated refrigerant flows back to the compressor 31 through the third port and the fourth port of the four-way reversing valve 32. At this time, the second bypass branch 38 is closed by the third control valve 37, so as to avoid the added second bypass branch 38 from affecting the smooth operation stage of heating, thereby ensuring the heating stability of the air conditioner.

[0046] Specifically, the third control valve 37 of the present embodiment is a third solenoid valve, and the fourth control valve 36 of the present embodiment is a fourth solenoid valve.

[0047] In order to improve the operating accuracy, stability and reliability of the air conditioner, the air conditioner in this embodiment also includes a second electronic expansion valve 34. The second electronic expansion valve 34 is arranged on the third flow path and is used to adjust and control the refrigerant flow in the third flow path to achieve precise control.

[0048] Second embodiment of the control method of the air conditioner:

[0049] The control method of the air conditioner of this embodiment is the control method of the air conditioner of the second embodiment described above. Figure 5 The specific steps of the air conditioner control method of this embodiment are as follows.

[0050] The control method of the air conditioner in this embodiment first executes step S21, and the air conditioner executes the power-on instruction, that is, the user sends the power-on instruction to the air conditioner through the remote controller, and the air conditioner executes the power-on instruction to start operation after receiving the power-on instruction.

[0051] Then, step S22 is executed to determine that the air conditioner executes the rapid heating mode operation, that is, the user sends a rapid heating mode instruction to the air conditioner through the remote control, so that the air conditioner enters the rapid heating mode operation after receiving the rapid heating mode instruction, and then step S23 is executed to control the third control valve 37 to be opened and the fourth control valve 36 to be closed, so that the outlet end of the compressor 31 is connected to the first port of the indoor heat exchanger 35 through the second bypass branch 38, and the third port of the four-way reversing valve 32 is controlled to be connected to the fourth port of the four-way reversing valve 32, so that the second port of the outdoor heat exchanger 33 is connected to the inlet end of the compressor 31 through the four-way reversing valve 32, that is, in the process of the air conditioner executing the rapid heating mode operation in this embodiment, the higher temperature refrigerant compressed by the compressor 31 flows to the indoor heat exchanger 35 through the second bypass branch 38, condenses in the indoor heat exchanger 35, and is cooled to the indoor environment The refrigerant after condensation releases heat and flows into the outdoor heat exchanger 33 through the third flow path. The refrigerant with a lower temperature and lower pressure evaporates in the outdoor heat exchanger 33 to absorb heat from the outdoor environment. The evaporated refrigerant will flow back to the compressor 31 through the third port and the fourth port of the four-way reversing valve 32, thereby completing the heating cycle. The higher-temperature refrigerant compressed by the compressor 31 flows to the indoor heat exchanger 35 through the second bypass branch 38. At the same time, the refrigerant after evaporation through the outdoor heat exchanger 33 flows back to the compressor 31 through the four-way reversing valve 32, so as to separate the refrigerants in two different thermal states into two flow paths without crossing positions for circulation, thereby avoiding the heat exchange loss at the four-way reversing valve 32, thereby shortening the time for the temperature of the indoor heat exchanger 35 to rise from the indoor ambient temperature to the preset temperature, so as to achieve the purpose of rapid heating when the heating operation is started, so as to improve the heating efficiency and thus improve the user experience.

[0052] After the air conditioner executes the rapid heating mode, step S24 is executed to determine whether the heating air outlet temperature sent into the room by the air conditioner is greater than the preset temperature. If so, step S25 is executed. If not, step S23 is executed to continue the rapid heating mode.

[0053] When it is determined that the temperature of the heating air outlet sent into the room by the air conditioner is greater than the preset temperature, it means that the actual heating effect of the air conditioner has basically reached the preset heating effect, then step S25 is executed to control the air conditioner to perform the normal heating mode operation, and then step S26 is executed to control the third control valve 37 to be closed and the fourth control valve 36 to be opened, and the first port of the four-way reversing valve 32 is controlled to be connected with the second port of the four-way reversing valve 32, so that the outlet end of the compressor 31 is connected with the first port of the indoor heat exchanger 35 through the four-way reversing valve 32, that is, in this embodiment, the air conditioner performs the normal heating mode operation. During operation, the refrigerant compressed by the compressor 31 flows to the indoor heat exchanger 35 through the first port and the second port of the four-way reversing valve 32, condenses in the indoor heat exchanger 35, and releases heat to the indoor environment. The condensed refrigerant flows into the outdoor heat exchanger 33 through the third flow path to evaporate and absorb heat from the outdoor environment. The evaporated refrigerant flows back to the compressor 31 through the third port and the fourth port of the four-way reversing valve 32. At this time, the second bypass branch 38 is closed by the third control valve 37, so as to avoid the added second bypass branch 38 from affecting the smooth operation stage of heating, thereby ensuring the heating stability of the air conditioner.

[0054] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. An air conditioner, comprising a compressor, a four-way reversing valve, an indoor heat exchanger and an outdoor heat exchanger, wherein the outlet end of the compressor is connected to the first port of the four-way reversing valve through a first flow path, the second port of the four-way reversing valve is connected to the first port of the indoor heat exchanger through a second flow path, the second port of the indoor heat exchanger is connected to the first port of the outdoor heat exchanger through a third flow path, the second port of the outdoor heat exchanger is connected to the third port of the four-way reversing valve through a fourth flow path, and the fourth port of the four-way reversing valve is connected to the inlet end of the compressor through a fifth flow path, characterized in that: The air conditioner also includes a first control valve, a second control valve and a first bypass branch, the two ends of the first bypass branch are respectively connected between the fourth flow path and the fifth flow path, the first control valve is arranged on the first bypass branch to open or close the first bypass branch, the second control valve is arranged on the flow branch section of the fourth flow path to open or close the flow branch section, and the flow branch section is located between the third port of the four-way reversing valve and the first bypass branch.

2. The air conditioner according to claim 1, characterized in that: The first control valve is a first solenoid valve; And / or, the second control valve is a second solenoid valve.

3. The air conditioner according to claim 1 or 2, characterized in that: The air conditioner further includes a first electronic expansion valve disposed on the third flow path.

4. A method for controlling an air conditioner, characterized in that: The air conditioner is an air conditioner as claimed in any one of claims 1 to 3, and the control method comprises: controlling the air conditioner to perform a rapid heating mode operation; The rapid heating mode includes: controlling the first control valve to open and controlling the second control valve to close, so that the second port of the outdoor heat exchanger is connected to the inlet end of the compressor through the first bypass branch, and controlling the first port of the four-way reversing valve to be connected to the second port of the four-way reversing valve, so that the outlet end of the compressor is connected to the first port of the indoor heat exchanger through the four-way reversing valve.

5. The air conditioner control method according to claim 4, characterized in that: The control method further comprises: after the air conditioner executes the rapid heating mode, determining whether the heating air outlet temperature sent into the room by the air conditioner is greater than a preset temperature, and if so, controlling the air conditioner to execute the normal heating mode; The normal heating mode includes: controlling the first control valve to close and controlling the second control valve to open, and controlling the third port of the four-way reversing valve to be connected with the fourth port of the four-way reversing valve, so that the second port of the outdoor heat exchanger is connected with the inlet end of the compressor through the four-way reversing valve.

6. An air conditioner, comprising a compressor, a four-way reversing valve, an indoor heat exchanger and an outdoor heat exchanger, wherein the outlet end of the compressor is connected to the first port of the four-way reversing valve through a first flow path, the second port of the four-way reversing valve is connected to the first port of the indoor heat exchanger through a second flow path, the second port of the indoor heat exchanger is connected to the first port of the outdoor heat exchanger through a third flow path, the second port of the outdoor heat exchanger is connected to the third port of the four-way reversing valve through a fourth flow path, and the fourth port of the four-way reversing valve is connected to the inlet end of the compressor through a fifth flow path, characterized in that: The air conditioner also includes a third control valve, a fourth control valve and a second bypass branch, the two ends of the second bypass branch are respectively connected between the first flow path and the second flow path, the third control valve is arranged on the second bypass branch to open or close the second bypass branch, the fourth control valve is arranged on the flow branch section of the first flow path to open or close the flow branch section, and the flow branch section is located between the first port of the four-way reversing valve and the second bypass branch.

7. The air conditioner according to claim 6, characterized in that: The third control valve is a third solenoid valve; And / or, the fourth control valve is a fourth solenoid valve.

8. The air conditioner according to any one of claims 6 or 7, characterized in that: The air conditioner further includes a second electronic expansion valve disposed on the third flow path.

9. A method for controlling an air conditioner, characterized in that: The air conditioner is the air conditioner according to any one of claims 6 to 8, and the control method comprises: controlling the air conditioner to perform a rapid heating mode operation; The rapid heating mode includes: controlling the third control valve to open and controlling the fourth control valve to close, so that the outlet end of the compressor is connected to the first port of the indoor heat exchanger through the second bypass branch, and controlling the third port of the four-way reversing valve to be connected to the fourth port of the four-way reversing valve, so that the second port of the outdoor heat exchanger is connected to the inlet end of the compressor through the four-way reversing valve.

10. The air conditioner control method according to claim 9, characterized in that: The control method further comprises: after the air conditioner executes the rapid heating mode, determining whether the heating air outlet temperature sent into the room by the air conditioner is greater than a preset temperature, and if so, controlling the air conditioner to execute the normal heating mode; The normal heating mode includes: controlling the third control valve to close and controlling the fourth control valve to open, and controlling the first port of the four-way reversing valve to be connected with the second port of the four-way reversing valve, so that the outlet end of the compressor is connected with the first port of the indoor heat exchanger through the four-way reversing valve.

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