Air conditioning system, air conditioner and control method thereof

Abstract

The present invention discloses an air conditioning system, an air conditioner and a control method thereof, wherein the air conditioning system comprises: a compressor, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and an exhaust heat exchanger, wherein a first outdoor port of the outdoor heat exchanger is communicated with an air outlet of the compressor, a first throttling port of the throttling device is communicated with a second outdoor port of the outdoor heat exchanger, a first indoor port of the indoor heat exchanger is communicated with a second throttling port of the throttling device, a second port of the indoor heat exchanger is communicated with an air return port of the compressor, a first exhaust port of the exhaust heat exchanger is communicated with an air outlet of the compressor and a second exhaust port of the exhaust heat exchanger is communicated with a first indoor port of the indoor heat exchanger, or a first exhaust port of the exhaust heat exchanger is communicated with an air return port of the compressor and a second exhaust port of the exhaust heat exchanger is communicated with a first indoor port of the indoor heat exchanger. The air conditioning system according to the present invention can recycle indoor cold or heat, and has a good energy-saving effect.

Description

Technical Field

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

[0002] According to the actual needs of production and life, hospitals, factories, laboratories and other places need to provide constant temperature and humidity environment conditions. In the related technology, there will be corresponding exhaust devices in the air conditioning system to ventilate the room, but a lot of cold or heat will be lost during the exhaust process, resulting in a lot of resource waste. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the present invention proposes an air conditioning system which can recover indoor cold or heat and has a good energy-saving effect.

[0005] The invention also provides an air conditioner.

[0006] The invention also provides a control method for the air conditioner.

[0007] The air-conditioning system of the present invention includes: a compressor; an outdoor heat exchanger, a first outdoor port of the outdoor heat exchanger is connected to the air outlet of the compressor; a throttling device, a first throttling port of the throttling device is connected to the second outdoor port of the outdoor heat exchanger; an indoor heat exchanger, a first indoor port of the indoor heat exchanger is connected to the second throttling port of the throttling device, and the second port of the indoor heat exchanger is connected to the return air port of the compressor; and an exhaust heat exchanger, a first exhaust port of the exhaust heat exchanger is connected to the air outlet of the compressor and a second exhaust port of the exhaust heat exchanger is connected to a first indoor port of the indoor heat exchanger, or a first exhaust port of the exhaust heat exchanger is connected to the return air port of the compressor and a second exhaust port of the exhaust heat exchanger is connected to a first indoor port of the indoor heat exchanger.

[0008] According to the air-conditioning system of the present invention, when the air-conditioning system is in cooling mode and the indoor cooling capacity needs to be recovered, a part of the refrigerant in the compressor is condensed under the action of the outdoor heat exchanger, and the relatively high temperature refrigerant after condensation is transformed into a low-temperature and low-pressure liquid through the throttling and pressure-reducing effect of the throttling device, and then the refrigerant enters the indoor heat exchanger for endothermic evaporation and then flows back to the compressor; the other part of the refrigerant is condensed under the action of the exhaust heat exchanger, and the relatively high temperature refrigerant after condensation is transformed into a low-temperature and low-pressure liquid through the throttling and pressure-reducing effect of the throttling device, and then the refrigerant enters the indoor heat exchanger for endothermic evaporation and then flows back to the compressor. Therefore, when the air-conditioning system of the present invention needs to recover cooling capacity, the exhaust heat exchanger can be opened to reduce the exhaust pressure of the air-conditioning system, enhance the condensing effect of the air-conditioning system, reduce the output power of the fan and compressor of the outdoor heat exchanger, improve the cooling capacity of the air-conditioning system, and have a good energy-saving effect.

[0009] Alternatively, when the air-conditioning system is in heating mode and heat needs to be recovered indoors, a portion of the refrigerant in the compressor is condensed under the action of the indoor heat exchanger, and the relatively high temperature refrigerant after condensation is converted into a low-temperature and low-pressure liquid through the throttling and pressure-reducing effect of the throttling device, and then the refrigerant enters the outdoor heat exchanger for heat absorption and evaporation and then flows back to the compressor; another portion of the refrigerant is condensed under the action of the indoor heat exchanger, and the relatively high temperature refrigerant after condensation is converted into a low-temperature and low-pressure liquid through the throttling and pressure-reducing effect of the throttling device, and then the refrigerant enters the exhaust heat exchanger for heat absorption and evaporation and then flows back to the compressor. Therefore, when the air-conditioning system of an embodiment of the present invention needs to recover heat, the exhaust heat exchanger can be opened to increase the evaporation pressure of the air-conditioning system, increase the circulation amount of the refrigerant in the air-conditioning system, reduce the output power of the fan and compressor of the outdoor heat exchanger, improve the heating capacity of the air-conditioning system, and have a good energy-saving effect.

[0010] In some embodiments, the air-conditioning system also includes a reversing valve, which has a first valve port, a second valve port and a third valve port, the first valve port is connected to the air outlet of the compressor through a first pipeline, the second valve port is connected to the first outdoor port of the outdoor heat exchanger, the third valve port is connected to the return air port of the compressor, and the second valve port can be switchably connected to one of the first valve port and the third valve port, wherein the first pipeline is connected to the first exhaust port of the exhaust heat exchanger through the second pipeline, the second port of the indoor heat exchanger is connected to the return air port of the compressor through the third pipeline, the second port of the indoor heat exchanger is connected to the first pipeline through a fourth pipeline, and the first exhaust port of the exhaust heat exchanger is connected to the return air port of the compressor through a fifth pipeline.

[0011] In some embodiments, the air-conditioning system also includes a control component, which includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve and a controller, and the controller is connected to the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve, the first solenoid valve is arranged on the third pipeline, the second solenoid valve is arranged on the second pipeline, the third solenoid valve is arranged on the fourth pipeline, and the fourth solenoid valve is arranged on the fifth pipeline.

[0012] In some embodiments, the second outdoor port of the outdoor heat exchanger is connected to the first indoor port of the indoor heat exchanger through a sixth pipeline, and the second outdoor port of the outdoor heat exchanger is connected to the second exhaust port of the exhaust heat exchanger through a seventh pipeline. The throttling device includes a first electronic expansion valve, a second electronic expansion valve and a third electronic expansion valve. The first electronic expansion valve is arranged on the sixth pipeline, the second electronic expansion valve is arranged on the seventh pipeline, and the third electronic expansion valve is arranged on the parallel pipe section of the sixth pipeline and the seventh pipeline.

[0013] In some embodiments, the control component also includes a temperature sensor, which is connected to the controller. The temperature sensor is used to detect the temperature difference between outdoor and indoor environments. The controller is used to determine whether cooling or heat recovery is required indoors by comparing the temperature difference with a preset temperature difference.

[0014] In some embodiments, the control component also includes a first pressure sensor, which is connected to the air outlet of the compressor for detecting the exhaust pressure value of the compressor. The first pressure sensor is connected to the controller, and the controller is used to determine whether cold recovery is required indoors by comparing the exhaust pressure value of the compressor with a preset exhaust pressure value.

[0015] In some embodiments, the control component also includes a second pressure sensor, which is connected to the return air port of the compressor for detecting the evaporation pressure value in the pipeline of the air-conditioning system. The second pressure sensor is connected to the controller, and the controller is used to determine whether heat recovery is required indoors by comparing the evaporation pressure value in the pipeline of the air-conditioning system with a preset evaporation pressure value.

[0016] In some embodiments, the compressor is a variable frequency compressor, and the controller is used to: when the frequency of the compressor is greater than or equal to a preset frequency value H1, determine that cooling or heat recovery is required indoors; and when the frequency of the compressor is less than the preset frequency value H1, determine that cooling or heat recovery is not required indoors.

[0017] The air conditioner of the present invention comprises: an air conditioning system, which is the air conditioning system described in any one of the above embodiments; an indoor unit housing, which has a accommodating cavity and an air inlet and an air outlet connected to the accommodating cavity, the indoor heat exchanger of the refrigeration system is arranged in the accommodating cavity, and the air outlet cooperates with the exhaust heat exchanger.

[0018] The air conditioner according to the present invention can recover indoor cold or heat, thereby improving the cooling or heating capacity of the air conditioner, reducing the output power of the air conditioner and achieving a better energy-saving effect.

[0019] In some embodiments, the air conditioner also includes a return air channel, a first end of the return air channel is connected to the air inlet, a second end of the return air channel is connected to the accommodating cavity, and the first end of the return air channel and the second end of the return air channel are respectively located on opposite sides of the indoor heat exchanger.

[0020] In some embodiments, there are multiple indoor unit shells, and there are multiple indoor heat exchangers in the refrigeration system. The multiple indoor heat exchangers correspond one-to-one to the air inlets of the multiple indoor unit shells, and the air outlets of the multiple indoor unit shells are interconnected.

[0021] The control method of the air conditioner of the present invention adopts the air conditioner described in any one of the above embodiments, and the control method of the air conditioner includes:

[0022] When the air conditioner is in cooling mode and no cold recovery is required indoors, the refrigerant in the compressor flows back into the compressor after passing through the outdoor heat exchanger, the throttling element and the indoor heat exchanger;

[0023] When the air conditioner is in cooling mode and the indoor cooling capacity needs to be recovered, a part of the refrigerant in the compressor flows back into the compressor after passing through the outdoor heat exchanger, the throttling device and the indoor heat exchanger, and another part of the refrigerant flows back into the compressor after passing through the exhaust heat exchanger, the throttling device and the indoor heat exchanger; or

[0024] When the air conditioner is in heating mode and no heat recovery is required indoors, the refrigerant in the compressor flows back into the compressor after passing through the indoor heat exchanger, the throttling element and the outdoor heat exchanger;

[0025] When the air conditioner is in heating mode and heat needs to be recovered indoors, a portion of the refrigerant in the compressor flows back into the compressor after passing through the indoor heat exchanger, the throttling device and the outdoor heat exchanger, and another portion of the refrigerant flows back into the compressor after passing through the indoor heat exchanger, the throttling device and the exhaust heat exchanger.

[0026] The control method of the air conditioner according to the present invention can recover the indoor cold or heat, thereby improving the cooling or heating capacity of the air conditioner, reducing the output power of the air conditioner and achieving a better energy-saving effect.

[0027] In some embodiments, when the air conditioner is in cooling mode, when the difference between the outdoor temperature and the indoor temperature is greater than or equal to the first temperature difference △T11, it is determined that cold recovery is required indoors, and when the difference between the outdoor temperature and the indoor temperature is less than the second temperature difference △T12, it is determined that cold recovery is not required indoors; or when the air conditioner is in heating mode, when the difference between the indoor temperature and the outdoor temperature is greater than or equal to the first temperature difference △T11, it is determined that heat recovery is required indoors, and when the difference between the indoor temperature and the outdoor temperature is less than the second temperature difference △T12, it is determined that heat recovery is not required indoors.

[0028] In some embodiments, the first temperature difference ΔT11 satisfies: 0<ΔT11≤10°, and the second temperature difference ΔT12 satisfies: -5°≤ΔT12≤0°.

[0029] In some embodiments, when the air conditioner is in cooling mode, when the exhaust pressure value of the compressor is greater than or equal to a first preset exhaust pressure value P11, it is determined that cold recovery is required indoors; when the exhaust pressure value of the compressor is less than a second preset exhaust pressure value P12, it is determined that cold recovery is not required indoors.

[0030] In some embodiments, the first preset exhaust pressure value P11 satisfies: 2.5 MPa<P11≤3.2 MPa, and the second preset exhaust pressure value P12 satisfies: 2.0 MPa≤P12≤2.5 MPa.

[0031] In some embodiments, when the air conditioner is in heating mode, when the evaporation pressure value in the pipe of the air-conditioning system is less than a first preset evaporation pressure value P31, it is determined that heat recovery is required indoors; when the evaporation pressure value in the pipe of the air-conditioning system is greater than or equal to a second preset evaporation pressure value P32, it is determined that heat recovery is not required indoors.

[0032] In some embodiments, the first preset evaporation pressure value P31 satisfies: 0.3 MPa≤P31<0.7 MPa, and the second preset evaporation pressure value P32 satisfies: 0.7 MPa≤P32≤1.0 MPa.

[0033] In some embodiments, when the air conditioner is in cooling mode, when the frequency of the compressor is greater than or equal to the preset frequency value H1, it is determined that cold recovery is required indoors, and when the frequency of the compressor is less than the preset frequency value H1, it is determined that cold recovery is not required indoors; or when the air conditioner is in heating mode, when the frequency of the compressor is greater than or equal to the preset frequency value H1, it is determined that heat recovery is required indoors, and when the frequency of the compressor is less than the preset frequency value H1, it is determined that heat recovery is not required indoors.

[0034] In some embodiments, the difference between the highest frequency value and the lowest frequency value of the compressor is H0, and the preset frequency value H1 satisfies: 1 / 3H0≤H1≤2 / 3H0. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of an air conditioning system according to an embodiment of the present invention.

[0036] Figure 2 It is a schematic diagram of the refrigerant flow direction when the air-conditioning system of an embodiment of the present invention does not need to recover cold in the cooling mode.

[0037] Figure 3 It is a schematic diagram of the refrigerant flow direction when the air-conditioning system of an embodiment of the present invention needs to recover cold energy in the cooling mode.

[0038] Figure 4 It is a schematic diagram of the refrigerant flow direction when the air-conditioning system according to an embodiment of the present invention does not need to recover heat in the heating mode.

[0039] Figure 5 It is a schematic diagram of the refrigerant flow when the air-conditioning system of an embodiment of the present invention needs to recover heat in the heating mode.

[0040] Figure 6 Schematic diagram of an air conditioning system according to another embodiment of the present invention.

[0041] Figure 7 Schematic diagram of an air conditioning system according to another embodiment of the present invention.

[0042] Reference numerals:

[0043] 1. Outdoor heat exchanger;

[0044] 2. Indoor heat exchanger;

[0045] 3. Exhaust heat exchanger;

[0046] 4. Compressor;

[0047] 5. Directional valve;

[0048] 6. Throttling device; 601. First electronic expansion valve; 602. Second electronic expansion valve; 603. Third electronic expansion valve;

[0049] 7. Control component; 701. First solenoid valve; 702. Second solenoid valve; 703. Third solenoid valve; 704. Fourth solenoid valve; 705. First pressure sensor; 706. Second pressure sensor;

[0050] 8. Gas-liquid separator;

[0051] 9. Return air duct;

[0052] 10. Indoor unit housing; 1001. Air inlet; 1002. Air outlet;

[0053] 11. First pipeline; 12. Second pipeline; 13. Third pipeline; 14. Fourth pipeline; 15. Fifth pipeline; 16. Sixth pipeline; 17. Seventh pipeline. DETAILED DESCRIPTION

[0054] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0055] Please refer to the following Figure 1-7 An air conditioning system, an air conditioner, and a control method thereof according to an embodiment of the present invention are described.

[0056] like Figures 1 to 5 As shown, the air conditioning system according to the embodiment of the present invention includes a compressor 4, an outdoor heat exchanger 1, a throttling device 6 and an exhaust air heat exchanger 3. The first outdoor port (eg Figure 1 The left end of the outdoor heat exchanger 1 is connected to the air outlet of the compressor 4, and the first throttling port of the throttling element 6 is connected to the second outdoor port of the outdoor heat exchanger 1 (such as Figure 1 The right end of the outdoor heat exchanger 1 is connected to the first indoor port of the indoor heat exchanger 2 (such as Figure 1 The lower end of the indoor heat exchanger 2 is connected to the second throttling port of the throttling element 6, and the second indoor port of the indoor heat exchanger 2 (such as Figure 1 The upper end of the indoor heat exchanger 2 is connected to the return air port of the compressor 4.

[0057] like Figures 1 to 3 As shown, when the air conditioning system is in cooling mode, the first exhaust port of the exhaust heat exchanger 3 (such as Figure 1 The upper end of the exhaust heat exchanger 3 is connected to the air outlet of the compressor 4 and the second exhaust port of the exhaust heat exchanger 3 (such as Figure 1 The lower end of the exhaust air heat exchanger 3) and the first indoor port of the indoor heat exchanger 2 (such as Figure 1The lower end of the middle indoor heat exchanger 2 is connected.

[0058] Or, if Figure 4 and Figure 5 As shown, when the air conditioning system is in heating mode, the first exhaust port of the exhaust heat exchanger 3 (such as Figure 4 The upper end of the exhaust heat exchanger 3) is connected to the return air port of the compressor 4 and the second exhaust port of the exhaust heat exchanger 3 (such as Figure 4 The lower end of the exhaust air heat exchanger 3) and the first indoor port of the indoor heat exchanger 2 (such as Figure 4 The lower end of the middle indoor heat exchanger 2 is connected.

[0059] According to the air-conditioning system of the embodiment of the present invention, when the air-conditioning system is in the cooling mode and the indoor cooling capacity needs to be recovered, a part of the refrigerant in the compressor 4 is condensed under the action of the outdoor heat exchanger 1, and the relatively high temperature refrigerant after condensation is transformed into a low-temperature and low-pressure liquid through the throttling and pressure reduction effect of the throttling device 6, and then the refrigerant enters the indoor heat exchanger 2 for heat absorption and evaporation and then flows back to the compressor 4; the other part of the refrigerant is condensed under the action of the exhaust heat exchanger 3, and the relatively high temperature refrigerant after condensation is transformed into a low-temperature and low-pressure liquid through the throttling and pressure reduction effect of the throttling device 6, and then the refrigerant enters the indoor heat exchanger 2 for heat absorption and evaporation and then flows back to the compressor 4, so that when the air-conditioning system of the embodiment of the present invention needs to recover cooling capacity, the exhaust heat exchanger 3 can be opened to reduce the exhaust pressure of the air-conditioning system, enhance the condensation effect of the air-conditioning system, reduce the output power of the fan of the outdoor heat exchanger 3 and the compressor 4, improve the cooling capacity of the air-conditioning system, and have a good energy-saving effect.

[0060] like Figure 1 As shown, when the air-conditioning system is in the heating mode and heat recovery is required indoors, a part of the refrigerant in the compressor 4 is condensed and heated under the action of the indoor heat exchanger 2, and the relatively high temperature refrigerant after condensation is converted into a low-temperature and low-pressure liquid through the throttling and pressure reduction effect of the throttling element 6, and then the refrigerant enters the outdoor heat exchanger 1 for heat absorption and evaporation and then flows back to the compressor 4; another part of the refrigerant is condensed under the action of the indoor heat exchanger 2, and the relatively high temperature refrigerant after condensation is converted into a low-temperature and low-pressure liquid through the throttling and pressure reduction effect of the throttling element 6, and then the refrigerant enters the exhaust heat exchanger 3 for heat absorption and evaporation and then flows back to the compressor 4, so that when the air-conditioning system of the embodiment of the present invention needs to recover heat, the exhaust heat exchanger 3 can be opened to increase the evaporation pressure of the air-conditioning system, increase the circulation amount of the refrigerant in the air-conditioning system, reduce the output power of the fan of the outdoor heat exchanger 3 and the compressor 4, improve the heating capacity of the air-conditioning system, and have a good energy-saving effect.

[0061] In some embodiments, Figure 1As shown, the air conditioning system further includes a reversing valve 5, and the reversing valve 5 has a first valve port, a second valve port, and a third valve port. Figure 1 As shown, the first valve port is the lower valve port of the reversing valve 5, the second valve port is the left valve port of the reversing valve 5, and the third valve port is the upper valve port of the reversing valve 5. It can be understood that the reversing valve 5 can be a three-way valve or a four-way valve.

[0062] like Figures 1 to 5 As shown, the first valve port is connected to the air outlet of the compressor 4 through the first pipeline 11, the second valve port is connected to the first outdoor port of the outdoor heat exchanger 1, the second valve port is switchably connected to one of the first valve port and the third valve port, and the third valve port is connected to the return port of the compressor 4. Specifically, the air conditioning system further includes a gas-liquid separator 8, and the third valve port is connected to the return port of the compressor 4 through the gas-liquid separator 8. Among them, the first pipeline 11 is connected to the first exhaust port of the exhaust heat exchanger 3 through the second pipeline 12, the second indoor port of the indoor heat exchanger 2 is connected to the return port of the compressor 4 through the third pipeline 13, the second indoor port of the indoor heat exchanger 2 is connected to the first pipeline 11 through the fourth pipeline 14, and the first exhaust port of the exhaust heat exchanger 3 is connected to the return port of the compressor 4 through the fifth pipeline 15, so that the air conditioning system of the embodiment of the present invention can change the heating mode and the cooling mode of the air conditioning system through the reversing valve 5 to improve the applicability of the air conditioning system.

[0063] It is understandable that if Figure 2 and Figure 3 As shown, the air-conditioning system can be switched to the cooling mode by the reversing valve 5. When the indoor cooling capacity needs to be recovered, a part of the refrigerant entering the indoor heat exchanger 2 flows back to the compressor 4 through the third pipe 13, and the other part of the refrigerant passes through the first pipe 11 and the second pipe 12 and then enters the exhaust heat exchanger 3, and then enters the indoor heat exchanger 2 after condensation in the exhaust heat exchanger 3, and finally flows back to the compressor 4 through the third pipe 13, so as to recover the indoor cooling capacity.

[0064] like Figure 4 and Figure 5 As shown, the air conditioning system is switched to the heating mode through the reversing valve 5. When heat needs to be recovered indoors, a portion of the refrigerant enters the indoor heat exchanger 2 through the fourth pipeline 14 for condensation, and the condensed refrigerant passes through the throttling device 6 and the outdoor heat exchanger 1 and then flows back to the compressor 4. Another portion of the refrigerant is condensed under the action of the indoor heat exchanger 2, and the condensed refrigerant passes through the throttling device 6 and the exhaust heat exchanger 3 and then flows back to the compressor 4 through the fifth pipeline 15, thereby recovering the indoor heat.

[0065] Furthermore, if Figures 1 to 5As shown, the air conditioning system further includes a control component 7, which includes a first solenoid valve 701, a second solenoid valve 702, a third solenoid valve 703, a fourth solenoid valve 704 and a controller (not shown). The controller is connected to the first solenoid valve 701, the second solenoid valve 702, the third solenoid valve 703, the fourth solenoid valve 704 and the reversing valve 5. The first solenoid valve 701 is arranged on the third pipeline 13, the second solenoid valve 702 is arranged on the second pipeline 12, the third solenoid valve 703 is arranged on the fourth pipeline 14, and the fourth solenoid valve 704 is arranged on the fifth pipeline 15. It can be understood that the controller can control the opening and closing of different first solenoid valves 701, second solenoid valves 702, third solenoid valves 703 and fourth solenoid valves 704 to conduct different pipelines, thereby realizing the cooling and heat recovery functions of the air conditioning system.

[0066] For example, Figure 2 As shown, when the air conditioner is in cooling mode and does not need to recover cold, the controller controls the first solenoid valve 701 to conduct the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to cut off the fourth pipeline 14, and controls the fourth solenoid valve 704 to cut off the fifth pipeline 15. Figure 3 As shown, when the air conditioner is in cooling mode and needs to recover cold energy, the controller controls the first solenoid valve 701 to connect the third pipeline 13, controls the second solenoid valve 702 to connect the second pipeline 12, controls the third solenoid valve 703 to cut off the fourth pipeline 14, and controls the fourth solenoid valve 704 to cut off the fifth pipeline 15.

[0067] like Figure 4 As shown, when the air conditioner is in heating mode and does not need to recover heat, the controller controls the first solenoid valve 701 to cut off the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to conduct the fourth pipeline 14, and controls the fourth solenoid valve 704 to cut off the fifth pipeline 15. Figure 5 As shown, when the air conditioner is in heating mode and heat recovery is required, the controller controls the first solenoid valve 701 to cut off the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to connect the fourth pipeline 14, and controls the fourth solenoid valve 704 to connect the fifth pipeline 15.

[0068] The air-conditioning system according to the embodiment of the present invention can control the opening and closing of different first solenoid valves 701, second solenoid valves 702, third solenoid valves 703 and fourth solenoid valves 704 through a controller to connect different pipelines, thereby realizing the cooling and heat recovery functions of the air-conditioning system, thereby improving the degree of automation of the air-conditioning system and further improving the energy-saving effect of the air-conditioning system.

[0069] In some embodiments, Figure 2As shown, the second outdoor port of the outdoor heat exchanger 1 (such as Figure 1 The right end of the outdoor heat exchanger 1) is connected to the first indoor port of the indoor heat exchanger 2 (such as Figure 1 The lower end of the indoor heat exchanger 2 is connected to the second outdoor port of the outdoor heat exchanger 1 (such as Figure 1 The right end of the middle outdoor heat exchanger 1) is connected to the second exhaust port (such as Figure 1 The throttling element 6 comprises a first electronic expansion valve 601, a second electronic expansion valve 602 and a third electronic expansion valve 603. The first electronic expansion valve 601 is arranged on the sixth pipeline 16, the second electronic expansion valve 602 is arranged on the seventh pipeline 17, and the third electronic expansion valve 603 is arranged on the parallel pipe section of the sixth pipeline 16 and the seventh pipeline 17.

[0070] It is understandable that if Figure 2 and Figure 3 As shown, when the air conditioning system is in cooling mode, a part of the high-temperature and high-pressure refrigerant discharged from the compressor 4 passes through the reversing valve 5, then enters the outdoor heat exchanger 1 for condensation, and then enters the indoor heat exchanger 2 for evaporation after passing through the throttling of the third electronic expansion valve 603 and the first electronic expansion valve 601 to cool and dehumidify the indoor air, and finally flows back to the compressor 4 through the fourth pipeline 14. When it is necessary to recover the indoor cold, another part of the high-temperature and high-pressure refrigerant enters the exhaust heat exchanger 3 through the second pipeline 12 for condensation, and then enters the indoor heat exchanger 2 for evaporation after passing through the throttling of the second electronic expansion valve 602 and the first electronic expansion valve 601, and finally flows back to the compressor 4 through the fourth pipeline 14, thereby completing the recovery of the indoor cold and improving the energy-saving effect of the air conditioning system.

[0071] In some embodiments, the control component 7 also includes a temperature sensor, which is connected to the controller. The temperature sensor is used to detect the temperature difference between outdoor and indoor environments. The controller is used to determine whether cooling or heat recovery is required indoors by comparing the temperature difference with the preset temperature difference.

[0072] Specifically, Figure 2 and Figure 3 As shown, when the air conditioner is in cooling mode, the outdoor temperature is detected as To, and the indoor temperature is detected as Ti. When the difference between the outdoor temperature To and the indoor temperature Ti is greater than or equal to the first temperature difference △T11, that is, To-Ti≥△T11, it is determined that cold recovery is required indoors. When the difference between the outdoor temperature To and the indoor temperature Ti is less than the second temperature difference △T12, that is, To-Ti<△T12, it is determined that cold recovery is not required indoors.

[0073] like Figure 4 and Figure 5 As shown, when the air conditioner is in heating mode, the outdoor temperature is detected as To, and the indoor temperature is detected as Ti. When the difference between the indoor temperature Ti and the outdoor temperature To is greater than or equal to the first temperature difference △T11, that is, Ti-To≥△T11, it is determined that heat recovery is required indoors. When the difference between the indoor temperature Ti and the outdoor temperature To is less than the second temperature difference △T12, that is, Ti-To<△T12, it is determined that heat recovery is not required indoors. Therefore, the air conditioner according to the present invention can control the operating state of the exhaust heat exchanger 3 according to the comparison of the indoor and outdoor ambient temperatures, which can ensure the indoor cooling, dehumidification and heating capabilities, greatly reduce the power output of the air conditioner, and improve the energy-saving effect of the air conditioner.

[0074] Preferably, the first temperature difference △T11 satisfies: 0<△T11≤10°, and the second temperature difference △T12 satisfies: -5°≤△T12≤0°. The inventor of the present application found through experiments that when the first temperature difference △T11 and the second temperature difference △T12 meet the above range, the cooling and heating capacity of the air conditioner is significantly improved, and the energy saving effect is better.

[0075] In other embodiments, Figures 1 to 5 As shown, the control component 7 also includes a first pressure sensor 705, which is connected to the air outlet of the compressor 4 for detecting the exhaust pressure value P0 of the compressor 4. The first pressure sensor 705 is connected to the controller, and the controller is used to determine whether cold recovery is required indoors by comparing the exhaust pressure value P0 of the compressor 4 with the preset exhaust pressure value P1.

[0076] Specifically, Figure 2 and Figure 3 As shown, when the air conditioner is in cooling mode, the exhaust pressure value P0 of the compressor 4 in the air conditioner is detected, and the preset exhaust pressure value P1 includes a first preset exhaust pressure value P11 and a second preset exhaust pressure value P12. When the exhaust pressure value P0 of the compressor 4 is greater than or equal to the first preset exhaust pressure value P11, it is determined that cold recovery is required indoors, and when the exhaust pressure value P0 of the compressor 4 is less than the second preset exhaust pressure value P12, it is determined that cold recovery is not required indoors. Therefore, the air conditioner according to the present invention can control the operating state of the exhaust heat exchanger 3 according to the preset operating pressure of the air conditioning system, which can ensure the indoor refrigeration and dehumidification capacity, greatly reduce the power output of the air conditioner, and improve the energy-saving effect of the air conditioner.

[0077] Preferably, the first preset exhaust pressure value P11 satisfies: 2.5MPa<P11≤3.2MPa, and the second preset exhaust pressure value P12 satisfies: 2.0MPa≤P12≤2.5MPa. The inventor of the present application has found through experiments that when the first preset exhaust pressure value P11 and the second preset exhaust pressure value P12 meet the above range, the cooling capacity of the air conditioner is significantly improved, and the energy saving effect is better.

[0078] In other embodiments, Figure 4 and Figure 5 As shown, the control component 7 also includes a second pressure sensor 706, which is connected to the return air port of the compressor 4 for detecting the evaporation pressure value P2 in the pipeline of the air-conditioning system. The second pressure sensor 706 is connected to the controller, and the controller is used to determine whether heat recovery is required indoors by comparing the evaporation pressure value P2 in the pipeline of the air-conditioning system with the preset evaporation pressure value P3.

[0079] Specifically, when the air conditioner is in heating mode, the return air pressure of the compressor 4 of the air conditioner is detected as P4, and the pipeline pressure loss in the air conditioner is detected as ΔP. ​​The difference between the return air pressure P4 of the compressor 4 of the air conditioner and the pipeline pressure loss ΔP in the air conditioner is the evaporation pressure value P2 in the pipeline of the air conditioning system. The preset evaporation pressure value P3 includes a first preset evaporation pressure value P31 and a second preset evaporation pressure value P32.

[0080] When the evaporation pressure value P2 is less than the first preset evaporation pressure value P31, it is determined that heat recovery is required indoors, and when the evaporation pressure value P2 is greater than or equal to the second preset evaporation pressure value P32, it is determined that heat recovery is not required indoors. Thus, the air conditioner according to the present invention can control the operating state of the exhaust heat exchanger 3 according to the preset optimal operating pressure range of the system, thereby ensuring the indoor heating capacity, greatly reducing the power output of the air conditioner, and improving the energy-saving effect of the air conditioner.

[0081] Preferably, the first preset evaporation pressure value P31 satisfies: 0.3MPa≤P31<0.7MPa, and the second preset evaporation pressure value P32 satisfies: 0.7MPa<P32≤1.0MPa. The inventor of the present application has found through experiments that when the first preset evaporation pressure value P31 and the second preset evaporation pressure value P32 meet the above ranges, the heating capacity of the air conditioner is significantly improved, and the energy-saving effect is better.

[0082] In other embodiments, Figures 1 to 5As shown, the compressor 4 is a variable frequency compressor 4. When the air conditioner is in cooling mode, the controller is used to determine that the indoor cooling capacity needs to be recovered when the frequency of the compressor 4 is greater than or equal to the preset frequency value H1, and when the frequency of the compressor 4 is less than the preset frequency value H1, it is determined that the indoor cooling capacity does not need to be recovered. When the air conditioner is in heating mode, the controller is used to determine that the indoor heat recovery is required when the frequency of the compressor 4 is greater than or equal to the preset frequency value H1, and when the frequency of the compressor 4 is less than the preset frequency value H1, it is determined that the indoor heat recovery is not required. Therefore, the air conditioner according to the present invention can control the operating state of the exhaust heat exchanger 3 according to the operating frequency of the compressor 4, which can ensure the indoor cooling, dehumidification and heating capabilities, greatly reduce the power output of the air conditioner, and improve the energy-saving effect of the air conditioner.

[0083] Preferably, the difference between the highest frequency value and the lowest frequency value of the compressor 4 is H0, and the preset frequency value H1 satisfies: 1 / 3H0≤H1≤2 / 3H0. The inventor of the present application found through experiments that when the preset frequency value satisfies 1 / 3H0≤H1≤2 / 3H0, the cooling and heating capacity of the air conditioner is significantly improved, and the energy-saving effect is better.

[0084] like Figures 1 to 5 As shown, the air conditioner according to the embodiment of the present invention comprises an air conditioning system and an indoor unit housing 10, wherein the air conditioning system is the air conditioning system of the embodiment of the present invention. The indoor unit housing 10 has a receiving cavity and an air inlet 1001 and an air outlet 1002 connected to the receiving cavity, the indoor heat exchanger 2 of the refrigeration system is arranged in the receiving cavity, and the air outlet 1002 cooperates with the exhaust heat exchanger 3.

[0085] In some embodiments, Figure 6 As shown, the air conditioner further includes a return air duct 9, a first end of the return air duct 9 (such as Figure 6 The left end of the return air channel 9 is connected to the air inlet 1001, and the second end of the return air channel 9 is connected to the air inlet 1001. Figure 6 The right end of the return air channel 9 is connected to the accommodating chamber, and the first end of the return air channel 9 and the second end of the return air channel 9 are respectively located on opposite sides of the indoor heat exchanger 2. Figure 7 As shown, there are multiple indoor unit shells 10, and there are multiple indoor heat exchangers 2 of the refrigeration system. The multiple indoor heat exchangers 2 correspond one-to-one to the air inlets 1001 of the multiple indoor unit shells 10, and the exhaust outlets 1002 of the multiple indoor unit shells 10 are interconnected. Therefore, the air conditioner of the embodiment of the present invention can centrally process the exhaust air from multiple rooms to recover cold and heat, saving the configuration cost of the equipment and further improving the energy-saving effect of the air conditioner.

[0086] like Figures 1 to 7 As shown, the control method of the air conditioner according to the embodiment of the present invention adopts the air conditioner according to the embodiment of the present invention, and the control method of the air conditioner according to the present invention includes:

[0087] When the air conditioner is in cooling mode and no cold recovery is required indoors, the refrigerant in the compressor 4 flows back into the compressor 4 after passing through the outdoor heat exchanger 1, the throttling element 6 and the indoor heat exchanger 2;

[0088] When the air conditioner is in cooling mode and the indoor cooling capacity needs to be recovered, a part of the refrigerant in the compressor 4 flows back into the compressor 4 after passing through the outdoor heat exchanger 1, the throttle 6 and the indoor heat exchanger 2, and another part of the refrigerant flows back into the compressor 4 after passing through the exhaust heat exchanger 3, the throttle 6 and the indoor heat exchanger 2; or

[0089] When the air conditioner is in heating mode and no heat recovery is required indoors, the refrigerant in the compressor 4 flows back into the compressor 4 after passing through the indoor heat exchanger 2, the throttling element 6 and the outdoor heat exchanger 1;

[0090] When the air conditioner is in heating mode and heat needs to be recovered indoors, a portion of the refrigerant in the compressor 4 flows back into the compressor 4 after passing through the indoor heat exchanger 2, the throttling device 6 and the outdoor heat exchanger 1, and another portion of the refrigerant flows back into the compressor 4 after passing through the indoor heat exchanger 2, the throttling device 6 and the exhaust heat exchanger 3.

[0091] Specifically, refer to Figure 1-7 The air conditioner and the control method of the air conditioner implemented by the present invention are described in detail below.

[0092] like Figures 1 to 5 As shown, the air conditioner includes an air conditioning system and an indoor unit housing 10, and the indoor unit housing 10 has a receiving cavity and an air inlet 1001 and an air outlet 1002 connected to the receiving cavity. The air conditioning system includes an outdoor heat exchanger 1, an indoor heat exchanger 2, an exhaust heat exchanger 3, a compressor 4, a reversing valve 5, a throttling device 6, a control component 7, a gas-liquid separator 8, a first pipeline 11, a second pipeline 12, a third pipeline 13, a fourth pipeline 14, a fifth pipeline 15, a sixth pipeline 16 and a seventh pipeline 17. The reversing valve 5 has a first valve port, a second valve port and a third valve port. The control component 7 includes a controller, a first solenoid valve 701, a second solenoid valve 702, a third solenoid valve 703, a fourth solenoid valve 704, a first pressure sensor 705 and a second pressure sensor 706. The throttling device 6 includes a first electronic expansion valve 601, a second electronic expansion valve 602 and a third electronic expansion valve 603. The outdoor heat exchanger 1 is disposed outside the indoor unit casing 10 , the indoor heat exchanger 2 is disposed in the accommodating chamber and opposite to the air inlet 1001 , and the exhaust heat exchanger 3 is disposed in the accommodating chamber and opposite to the air outlet 1002 .

[0093] like Figures 1 to 5As shown, the first valve port is connected to the air outlet of the compressor 4 through the first pipeline 11, the second valve port is connected to the first outdoor port of the outdoor heat exchanger 1, the second valve port is switchably connected to one of the first valve port and the third valve port, the third valve port is connected to the return port of the compressor 4, and the third valve port is connected to the return port of the compressor 4 through the gas-liquid separator 8. Among them, the first pipeline 11 is connected to the first exhaust port of the exhaust heat exchanger 3 through the second pipeline 12, the second indoor port of the indoor heat exchanger 2 is connected to the return port of the compressor 4 through the third pipeline 13, the second indoor port of the indoor heat exchanger 2 is connected to the first pipeline 11 through the fourth pipeline 14, and the first exhaust port of the exhaust heat exchanger 3 is connected to the return port of the compressor 4 through the fifth pipeline 15. The second outdoor port of the outdoor heat exchanger 1 is connected to the first indoor port of the indoor heat exchanger 2 through the sixth pipeline 16, and the second outdoor port of the outdoor heat exchanger 1 is connected to the second exhaust port of the exhaust heat exchanger 3 through the seventh pipeline 17.

[0094] like Figures 1 to 5 As shown, the controller is connected to the first solenoid valve 701, the second solenoid valve 702, the third solenoid valve 703, the fourth solenoid valve 704, the reversing valve 5, the first electronic expansion valve 601, the second electronic expansion valve 602 and the third electronic expansion valve 603. The first solenoid valve 701 is arranged on the third pipeline 13, the second solenoid valve 702 is arranged on the second pipeline 12, the third solenoid valve 703 is arranged on the fourth pipeline 14, and the fourth solenoid valve 704 is arranged on the fifth pipeline 15. The first electronic expansion valve 601 is arranged on the sixth pipeline 16, the second electronic expansion valve 602 is arranged on the seventh pipeline 17, and the third electronic expansion valve 603 is arranged on the parallel pipe section of the sixth pipeline 16 and the seventh pipeline 17.

[0095] 1. When the air conditioner is in cooling mode.

[0096] like Figure 2 and Figure 3 As shown, the high-temperature and high-pressure refrigerant discharged from the compressor 4 passes through the reversing valve 5, condenses in the outdoor heat exchanger 1, is throttled by the third electronic expansion valve 603 and the first electronic expansion valve 601, and cools and dehumidifies the outside air during evaporation in the indoor heat exchanger 2.

[0097] Solution 1, the outdoor temperature is detected as To by the temperature sensor, and the indoor temperature is detected as Ti. When the air conditioner is in cooling mode, the value of To-Ti is compared with the first temperature difference △T11 and the second temperature difference △T12. The first temperature difference △T11 satisfies: 0<△T11≤10°, and the second temperature difference △T12 satisfies: -5°≤△T12≤0°. When the difference between the outdoor temperature To and the indoor temperature Ti is greater than or equal to the first temperature difference △T11, it is determined that the indoor cooling capacity needs to be recovered, and then the controller controls the first solenoid valve 701 to conduct the third pipeline 13, controls the second solenoid valve 702 to conduct the second pipeline 12, controls the third solenoid valve 703 to cut off the fourth pipeline 14, controls the fourth solenoid valve 704 to cut off the fifth pipeline 15, and the second electronic expansion valve 602 is opened, and the second electronic expansion valve 602 is controlled according to the target supercooling degree.

[0098] When the difference between the outdoor temperature To and the indoor temperature Ti is less than the second temperature difference ΔT12, it is determined that no cold recovery is needed indoors. At this time, it is determined that the air conditioner is in a low-load cooling operation and does not need to recover the cold in the exhaust air. Then, the controller controls the first solenoid valve 701 to conduct the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to cut off the fourth pipeline 14, controls the fourth solenoid valve 704 to cut off the fifth pipeline 15, and closes the second electronic expansion valve 602.

[0099] Solution 2, the first pressure sensor 705 is connected to the air outlet of the compressor 4 to detect the exhaust pressure value P0 of the compressor 4, and the first pressure sensor 705 is connected to the controller, and the controller is used to determine whether the indoor cooling capacity recovery is required by comparing the exhaust pressure value P0 of the compressor 4 with the value of the preset exhaust pressure value P1. The exhaust pressure value P0 of the compressor 4 in the air conditioner is detected, and the preset exhaust pressure value P1 includes a first preset exhaust pressure value P11 and a second preset exhaust pressure value P12. The first preset exhaust pressure value P11 satisfies: 2.5MPa<P11≤3.2MPa, and the second preset exhaust pressure value P12 satisfies: 2.0MPa≤P12≤2.5MPa.

[0100] When the exhaust pressure value P0 of the compressor 4 is greater than or equal to the first preset exhaust pressure value P11, it is determined that the indoor cooling capacity recovery is required, and then the controller controls the first solenoid valve 701 to conduct the third pipeline 13, controls the second solenoid valve 702 to conduct the second pipeline 12, controls the third solenoid valve 703 to cut off the fourth pipeline 14, controls the fourth solenoid valve 704 to cut off the fifth pipeline 15, and the second electronic expansion valve 602 is opened, and the second electronic expansion valve 602 is controlled according to the target supercooling degree. When the exhaust pressure value P0 of the compressor 4 is less than the second preset exhaust pressure value P12, it is determined that the indoor cooling capacity recovery is not required, and then the controller controls the first solenoid valve 701 to conduct the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to cut off the fourth pipeline 14, controls the fourth solenoid valve 704 to cut off the fifth pipeline 15, and the second electronic expansion valve 602 is closed.

[0101] Solution 3, the compressor 4 is a variable frequency compressor 4, the difference between the highest frequency value and the lowest frequency value of the compressor 4 is H0, the preset frequency value H1 satisfies: 1 / 3H0≤H1≤2 / 3H0, when the frequency of the compressor 4 is greater than or equal to the preset frequency value H1, it is determined that the indoor cooling capacity needs to be recovered, and then the controller controls the first solenoid valve 701 to connect the third pipeline 13, controls the second solenoid valve 702 to connect the second pipeline 12, controls the third solenoid valve 703 to cut off the fourth pipeline 14, controls the fourth solenoid valve 704 to cut off the fifth pipeline 15, and the second electronic expansion valve 602 is opened, and the second electronic expansion valve 602 is controlled according to the target supercooling degree. When the frequency of the compressor 4 is less than the preset frequency value H1, it is determined that no cold recovery is needed indoors, and then the controller controls the first solenoid valve 701 to connect the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to cut off the fourth pipeline 14, controls the fourth solenoid valve 704 to cut off the fifth pipeline 15, and the second electronic expansion valve 602 is closed.

[0102] 2. When the air conditioner is in heating mode.

[0103] like Figure 4 and Figure 5 As shown, the high-temperature and high-pressure refrigerant discharged from the compressor 4 passes through the reversing valve 5 and the third solenoid valve 703 to be condensed and heated in the indoor heat exchanger 2. The first electronic expansion valve 601 is opened and controlled according to the target supercooling degree.

[0104] Solution 1, the outdoor temperature is detected as To, the indoor temperature is detected as Ti, when the air conditioner is in heating mode, the value of Ti-To is compared with the first temperature difference △T11 and the second temperature difference △T12, the first temperature difference △T11 satisfies: 0<△T11≤10°, the second temperature difference △T12 satisfies: -5°≤△T12≤0°. When the difference between the indoor temperature Ti and the outdoor temperature To is greater than or equal to the first temperature difference △T11, it is determined that heat recovery is required indoors, so the controller controls the first solenoid valve 701 to cut off the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to conduct the fourth pipeline 14, controls the fourth solenoid valve 704 to conduct the fifth pipeline 15, and the second electronic expansion valve 602 is controlled according to the target superheat. When the difference between the indoor temperature Ti and the outdoor temperature To is less than the second temperature difference △T12, it is determined that heat recovery is not required indoors, so the controller controls the first solenoid valve 701 to cut off the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to connect the fourth pipeline 14, controls the fourth solenoid valve 704 to cut off the fifth pipeline 15, and the second electronic expansion valve 602 is closed.

[0105] Solution 2, the return air pressure of the compressor 4 of the air conditioner is detected as P4, the pipeline pressure loss in the air conditioner is detected as ΔP, and the difference between the return air pressure P4 of the compressor 4 of the air conditioner and the pipeline pressure loss ΔP in the air conditioner is the evaporation pressure value P2 in the pipeline of the air conditioning system. The preset evaporation pressure value P3 includes a first preset evaporation pressure value P31 and a second preset evaporation pressure value P32. The first preset evaporation pressure value P31 satisfies: 0.3MPa≤P31<0.7MPa, and the second preset evaporation pressure value P32 satisfies: 0.7MPa≤P32≤1.0MPa.

[0106] When the evaporation pressure value P2 is less than the first preset evaporation pressure value P31, it is determined that heat recovery is required indoors, so the controller controls the first solenoid valve 701 to cut off the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to connect the fourth pipeline 14, controls the fourth solenoid valve 704 to connect the fifth pipeline 15, and the second electronic expansion valve 602 is controlled according to the target superheat. When the evaporation pressure value P2 is greater than or equal to the second preset evaporation pressure value P32, it is determined that heat recovery is not required indoors, so the controller controls the first solenoid valve 701 to cut off the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to connect the fourth pipeline 14, controls the fourth solenoid valve 704 to cut off the fifth pipeline 15, and the second electronic expansion valve 602 is closed.

[0107] Solution 3, the compressor 4 is a variable frequency compressor 4, the difference between the highest frequency value and the lowest frequency value of the compressor 4 is H0, and the preset frequency value H1 satisfies: 1 / 3H0≤H1≤2 / 3H0. When the frequency of the compressor 4 is greater than or equal to the preset frequency value H1, it is determined that heat recovery is required indoors, so the controller controls the first solenoid valve 701 to cut off the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to conduct the fourth pipeline 14, controls the fourth solenoid valve 704 to conduct the fifth pipeline 15, and the second electronic expansion valve 602 is controlled according to the target superheat. When the frequency of the compressor 4 is less than the preset frequency value H1, it is determined that heat recovery is not required indoors, so the controller controls the first solenoid valve 701 to cut off the third pipeline 13, controls the second solenoid valve 702 to cut off the second pipeline 12, controls the third solenoid valve 703 to conduct the fourth pipeline 14, controls the fourth solenoid valve 704 to cut off the fifth pipeline 15, and the second electronic expansion valve 602 is closed.

[0108] The air conditioner according to the present invention can control the operating state of the exhaust heat exchanger 3 according to the comparison of the indoor and outdoor ambient temperatures, the preset operating pressure of the air-conditioning system or the preset operating frequency of the compressor 4, so as to ensure the indoor cooling, dehumidification and heating capabilities, greatly reduce the power output of the air conditioner, and improve the energy-saving effect of the air conditioner.

[0109] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0110] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0111] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0112] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0113] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0114] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air conditioning system, characterized in that: include: compressor; An outdoor heat exchanger, wherein a first outdoor port of the outdoor heat exchanger is connected to an air outlet of the compressor; A throttling element, wherein a first throttling port of the throttling element is in communication with a second outdoor port of the outdoor heat exchanger; an indoor heat exchanger, wherein a first indoor port of the indoor heat exchanger is communicated with a second throttling port of the throttling element, and a second port of the indoor heat exchanger is communicated with an air return port of the compressor; and An exhaust heat exchanger, wherein a first exhaust port of the exhaust heat exchanger is communicated with an air outlet of the compressor and a second exhaust port of the exhaust heat exchanger is communicated with a first indoor port of the indoor heat exchanger, or the first exhaust port of the exhaust heat exchanger is communicated with an air return port of the compressor and the second exhaust port of the exhaust heat exchanger is communicated with the first indoor port of the indoor heat exchanger; a reversing valve, wherein the reversing valve has a first valve port, a second valve port and a third valve port, the first valve port is communicated with the air outlet of the compressor through a first pipeline, the second valve port is communicated with the first outdoor port of the outdoor heat exchanger, the third valve port is communicated with the return air port of the compressor, the second valve port is switchably communicated with one of the first valve port and the third valve port, wherein the first pipeline is communicated with the first exhaust port of the exhaust heat exchanger through the second pipeline, the second port of the indoor heat exchanger is communicated with the return air port of the compressor through the third pipeline, the second port of the indoor heat exchanger is communicated with the first pipeline through a fourth pipeline, and the first exhaust port of the exhaust heat exchanger is communicated with the return air port of the compressor through a fifth pipeline; A control component, the control component includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a fourth solenoid valve and a controller, the controller is connected to the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve, the first solenoid valve is arranged on the third pipeline, the second solenoid valve is arranged on the second pipeline, the third solenoid valve is arranged on the fourth pipeline, and the fourth solenoid valve is arranged on the fifth pipeline; The control component also includes a first pressure sensor, which is connected to the air outlet of the compressor for detecting the exhaust pressure value of the compressor. The first pressure sensor is connected to the controller, and the controller is used to determine whether cold recovery is required indoors by comparing the exhaust pressure value of the compressor with a preset exhaust pressure value.

2. The air conditioning system according to claim 1, characterized in that: The second outdoor port of the outdoor heat exchanger is communicated with the first indoor port of the indoor heat exchanger through the sixth pipeline, and the second outdoor port of the outdoor heat exchanger is communicated with the second exhaust port of the exhaust heat exchanger through the seventh pipeline. The throttling device includes a first electronic expansion valve, a second electronic expansion valve and a third electronic expansion valve. The first electronic expansion valve is arranged on the sixth pipeline, the second electronic expansion valve is arranged on the seventh pipeline, and the third electronic expansion valve is arranged on the parallel pipe section of the sixth pipeline and the seventh pipeline.

3. The air conditioning system according to claim 1, characterized in that: The control component also includes a temperature sensor, which is connected to the controller and is used to detect the temperature difference between outdoor and indoor environments. The controller is used to determine whether cooling or heat recovery is required indoors by comparing the temperature difference with a preset temperature difference.

4. The air conditioning system according to claim 1, characterized in that: The control component also includes a second pressure sensor, which is connected to the return air port of the compressor to detect the evaporation pressure value in the pipeline of the air-conditioning system. The second pressure sensor is connected to the controller, and the controller is used to determine whether heat recovery is required indoors by comparing the evaporation pressure value in the pipeline of the air-conditioning system with a preset evaporation pressure value.

5. The air conditioning system according to claim 1, characterized in that: The compressor is a variable frequency compressor, and the controller is used for: When the frequency of the compressor is greater than or equal to the preset frequency value H1, it is determined that cooling or heat recovery is required indoors; and when the frequency of the compressor is less than the preset frequency value H1, it is determined that cooling or heat recovery is not required indoors.

6. An air conditioner, characterized in that: include: An air conditioning system, wherein the air conditioning system is the air conditioning system according to any one of claims 1 to 5; The indoor unit casing has a accommodating cavity and an air inlet and an air outlet communicated with the accommodating cavity. The indoor heat exchanger of the air conditioning system is arranged in the accommodating cavity, and the air outlet cooperates with the exhaust heat exchanger.

7. The air conditioner according to claim 6, characterized in that: It also includes a return air channel, a first end of which is connected to the air inlet, a second end of which is connected to the accommodating cavity, and the first end of the return air channel and the second end of the return air channel are respectively located on opposite sides of the indoor heat exchanger.

8. The air conditioner according to claim 6, characterized in that: There are multiple indoor unit casings, and there are multiple indoor heat exchangers in the air conditioning system. The multiple indoor heat exchangers correspond one-to-one to the air inlets of the multiple indoor unit casings, and the air outlets of the multiple indoor unit casings are interconnected.

9. A method for controlling an air conditioner, characterized in that: The air conditioner according to any one of claims 6 to 8 is used, wherein the control method of the air conditioner comprises: When the air conditioner is in cooling mode and no cold recovery is required indoors, the refrigerant in the compressor flows back into the compressor after passing through the outdoor heat exchanger, the throttling element and the indoor heat exchanger; When the air conditioner is in cooling mode and the indoor cooling capacity needs to be recovered, a part of the refrigerant in the compressor flows back into the compressor after passing through the outdoor heat exchanger, the throttling device and the indoor heat exchanger, and another part of the refrigerant flows back into the compressor after passing through the exhaust heat exchanger, the throttling device and the indoor heat exchanger; or When the air conditioner is in heating mode and no heat recovery is required indoors, the refrigerant in the compressor flows back into the compressor after passing through the indoor heat exchanger, the throttling element and the outdoor heat exchanger; When the air conditioner is in heating mode and heat needs to be recovered indoors, a portion of the refrigerant in the compressor flows back into the compressor after passing through the indoor heat exchanger, the throttling device and the outdoor heat exchanger, and another portion of the refrigerant flows back into the compressor after passing through the indoor heat exchanger, the throttling device and the exhaust heat exchanger.

10. The air conditioner control method according to claim 9, characterized in that: When the air conditioner is in cooling mode, when the difference between the outdoor temperature and the indoor temperature is greater than or equal to the first temperature difference △T11, it is determined that the indoor cooling capacity needs to be recovered, and when the difference between the outdoor temperature and the indoor temperature is less than the second temperature difference △T12, it is determined that the indoor cooling capacity does not need to be recovered; or When the air conditioner is in heating mode, when the difference between the indoor temperature and the outdoor temperature is greater than or equal to the first temperature difference △T11, it is determined that heat recovery is required indoors, and when the difference between the indoor temperature and the outdoor temperature is less than the second temperature difference △T12, it is determined that heat recovery is not required indoors.

11. The air conditioner control method according to claim 10, characterized in that: The first temperature difference ΔT11 satisfies: 0<ΔT11≤10°, and the second temperature difference ΔT12 satisfies: -5°≤ΔT12≤0°.

12. The air conditioner control method according to claim 9, characterized in that: When the air conditioner is in cooling mode, when the exhaust pressure value of the compressor is greater than or equal to the first preset exhaust pressure value P11, it is determined that cold recovery is required indoors; when the exhaust pressure value of the compressor is less than the second preset exhaust pressure value P12, it is determined that cold recovery is not required indoors.

13. The control method of the air conditioner according to claim 12, characterized in that: The first preset exhaust pressure value P11 satisfies: 2.5 MPa<P11≤3.2 MPa, and the second preset exhaust pressure value P12 satisfies: 2.0 MPa≤P12≤2.5 MPa.

14. The air conditioner control method according to claim 9, characterized in that: When the air conditioner is in heating mode, when the evaporation pressure value in the pipeline of the air-conditioning system is less than the first preset evaporation pressure value P31, it is determined that heat recovery is required indoors; when the evaporation pressure value in the pipeline of the air-conditioning system is greater than or equal to the second preset evaporation pressure value P32, it is determined that heat recovery is not required indoors.

15. The control method of the air conditioner according to claim 14, characterized in that: The first preset evaporation pressure value P31 satisfies: 0.3 MPa≤P31<0.7 MPa, and the second preset evaporation pressure value P32 satisfies: 0.7 MPa≤P32≤1.0 MPa.

16. The control method of the air conditioner according to claim 9, characterized in that: When the air conditioner is in cooling mode, when the frequency of the compressor is greater than or equal to the preset frequency value H1, it is determined that cold recovery is required indoors, and when the frequency of the compressor is less than the preset frequency value H1, it is determined that cold recovery is not required indoors; or When the air conditioner is in heating mode, when the frequency of the compressor is greater than or equal to a preset frequency value H1, it is determined that heat recovery is required indoors, and when the frequency of the compressor is less than the preset frequency value H1, it is determined that heat recovery is not required indoors.

17. The air conditioner control method according to claim 16, characterized in that: The difference between the highest frequency value and the lowest frequency value of the compressor is H0, and the preset frequency value H1 satisfies: 1 / 3H0≤H1≤2 / 3H0.

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