Air conditioning system and control method thereof

Abstract

The invention relates to the technical field of air conditioning systems, particularly provides an air conditioning system and a control method thereof, and aims to solve the problem of indoor temperature fluctuation caused by defrosting in low-temperature weather and refrigerating in high-temperature weather of an existing air conditioning system. The air conditioning system comprises a refrigerant circulation loop, and a compressor, a reversing valve, an indoor heat exchanger and an outdoor heat exchanger which are arranged on the refrigerant circulation loop. The system further comprises an auxiliary heat exchanger, an auxiliary refrigerant pipeline and a floor heating pipeline, the auxiliary refrigerant pipeline and the floor heating pipeline exchange heat through the auxiliary heat exchanger, the first end of the auxiliary refrigerant pipeline is connected with the pipeline between the reversing valve and the outdoor heat exchanger, and the second end of the auxiliary refrigerant pipeline is connected with the pipeline between the indoor heat exchanger and the outdoor heat exchanger. And a fluorine pump and an auxiliary switch valve are arranged on the auxiliary refrigerant pipeline. During defrosting, a refrigerant absorbs residual heat of the floor heating pipeline, defrosts the outdoor heat exchanger and does not take heat from the indoor environment, and during refrigeration, the refrigerant heat is absorbed through the floor heating pipeline, so that indoor environment fluctuation is reduced.

Description

Technical Field

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

[0002] In winter, air conditioners need to run in a cooling mode to defrost, taking heat from the room and releasing heat in the outdoor heat exchanger for defrosting. However, this defrosting mode easily causes indoor ambient temperature fluctuations, affecting user experience. In order to minimize the impact on indoor ambient temperature and prevent excessive indoor heat exchange, which causes large indoor temperature fluctuations, the current air conditioning system usually does not rotate during defrosting, but the refrigerant still takes heat from the room, causing indoor temperature fluctuations and reducing comfort.

[0003] Moreover, in hot summer weather, the high outdoor ambient temperature will lead to poor heat dissipation of the outdoor heat exchanger. When the pressure in the air-conditioning system reaches the alarm threshold, the compressor will reduce the frequency of operation, which will lead to a decrease in the indoor cooling effect and also cause fluctuations in indoor temperature.

[0004] Accordingly, there is a need in the art for a new air conditioning system to solve the problem of large indoor temperature fluctuations caused by existing air conditioning systems during defrosting in low-temperature weather and cooling in high-temperature weather. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing air-conditioning system causes large fluctuations in indoor temperature when defrosting in low-temperature weather and cooling in high-temperature weather.

[0006] In a first aspect, the present invention provides an air conditioning system, the air conditioning system comprising a refrigerant circulation loop and a compressor, a reversing valve, an indoor heat exchanger and an outdoor heat exchanger arranged on the refrigerant circulation loop;

[0007] The air-conditioning system also includes an auxiliary heat exchanger, an auxiliary refrigerant pipeline and a floor heating pipeline. The auxiliary refrigerant pipeline and the floor heating pipeline exchange heat through the auxiliary heat exchanger. The first end of the auxiliary refrigerant pipeline is connected to the pipeline between the reversing valve and the outdoor heat exchanger, and the second end of the auxiliary refrigerant pipeline is connected to the pipeline between the indoor heat exchanger and the outdoor heat exchanger. A fluorine pump and an auxiliary switch valve are arranged on the auxiliary refrigerant pipeline.

[0008] When the above technical solution is adopted, when the air conditioning system defrosts the outdoor heat exchanger, the compressor is stopped, the fluorine pump is turned on, and the auxiliary circuit switch valve is opened. The refrigerant in the pipeline circulates into the auxiliary refrigerant pipeline and exchanges heat with the floor heating water in the auxiliary circuit heat exchanger. After the refrigerant absorbs the heat of the floor heating water, it enters the outdoor heat exchanger to defrost the outdoor heat exchanger. During the defrosting process of the air conditioning system of the present invention, the refrigerant absorbs the residual heat of the floor heating pipeline to defrost the outdoor heat exchanger, and does not take heat from the indoor environment, thereby reducing the temperature fluctuation of the indoor environment.

[0009] When the outdoor ambient temperature is high, the heat dissipation effect of the outdoor heat exchanger is poor. In order to prevent the pressure in the air-conditioning system from reaching the alarm threshold and causing the compressor to reduce the frequency and reduce the cooling effect, during high-temperature cooling, the compressor is started, the reversing valve is switched to connect the compressor outlet and the outdoor heat exchanger, and the fluorine pump is turned on, and the auxiliary switch valve is opened. The low-temperature water through the floor heating pipeline and the outdoor heat exchanger jointly dissipate the heat for the refrigerant, and the refrigerant participates in the refrigeration cycle after liquefaction. The structure of this air-conditioning system can achieve efficient cooling in summer on the basis of achieving floor heating defrosting in winter, and can keep the indoor temperature stable regardless of low or high temperature weather.

[0010] In an optional technical solution of the above-mentioned air-conditioning system, the air-conditioning system also includes an auxiliary refrigerant branch, one end of the auxiliary refrigerant branch is connected to the first end of the auxiliary refrigerant pipeline and the pipeline between the auxiliary heat exchanger, the other end of the auxiliary refrigerant branch is connected to the pipeline between the reversing valve and the indoor heat exchanger, and a branch switching valve is arranged on the auxiliary refrigerant branch.

[0011] When the temperature of the floor heating pipeline is too low, the air conditioning system heats the indoor space and also heats the floor heating. Specifically, the branch switch valve is opened, and part of the high-temperature and high-pressure gaseous refrigerant at the compressor outlet enters the indoor heat exchanger to heat the indoor space, and the other part enters the auxiliary refrigerant pipeline through the auxiliary refrigerant branch. The auxiliary refrigerant pipeline and the floor heating pipeline exchange heat in the auxiliary heat exchanger, and the floor heating pipeline absorbs the heat of the refrigerant.

[0012] In an optional technical solution of the above air-conditioning system, a main circuit throttling device is provided on the refrigerant circulation loop.

[0013] When the above technical solution is adopted, the main circuit throttling device throttles the refrigerant in the refrigerant pipeline to adjust the flow rate.

[0014] In an optional technical solution of the above air-conditioning system, an oil-gas separator is provided between the reversing valve and the air outlet of the compressor; and / or a gas-liquid separator is provided between the air inlet of the compressor and the reversing valve.

[0015] In the case of adopting the above technical solution, the oil-gas separator is used to separate the compressor oil and the refrigerant. The gas-liquid separator is used to separate the liquid refrigerant from the gas-liquid mixed phase refrigerant, and the gaseous refrigerant returns to the compressor air inlet.

[0016] In a second aspect, the present invention provides a control method for an air conditioning system, the air conditioning system comprising a refrigerant circulation loop and a compressor, a reversing valve, an indoor heat exchanger and an outdoor heat exchanger arranged on the refrigerant circulation loop;

[0017] The air conditioning system further comprises an auxiliary heat exchanger, an auxiliary refrigerant pipeline and a floor heating pipeline, the auxiliary refrigerant pipeline and the floor heating pipeline exchange heat through the auxiliary heat exchanger, the first end of the auxiliary refrigerant pipeline is connected to the pipeline between the reversing valve and the outdoor heat exchanger, the second end of the auxiliary refrigerant pipeline is connected to the pipeline between the indoor heat exchanger and the outdoor heat exchanger, and a fluorine pump and an auxiliary switch valve are arranged on the auxiliary refrigerant pipeline;

[0018] The control method comprises the following steps:

[0019] Receiving a command to operate a defrost mode;

[0020] The compressor is controlled to stop, the fluorine pump is turned on, and the auxiliary circuit switch valve is opened.

[0021] When the above technical solution is adopted, when the defrosting mode is in operation, the compressor is stopped, the fluorine pump is turned on, and the auxiliary circuit switch valve is turned on. During defrosting, the compressor is stopped, and the fluorine pump is used to drive the refrigerant to flow and exchange heat with the floor heating to avoid compressor liquid hammer and low pressure failure.

[0022] In the optional technical solution of the control method of the air conditioning system, the control method further includes the following steps:

[0023] Receiving a command to operate a conventional heating mode;

[0024] The compressor is controlled to be turned on, the reversing valve is controlled to switch to connect the compressor outlet with the indoor heat exchanger, the fluorine pump is turned off, and the auxiliary circuit switch valve is closed.

[0025] When the above technical solution is adopted, when the air-conditioning system is in normal heating mode, the compressor is started, the fluorine pump is turned off, the auxiliary switch valve is closed, the four-way valve is switched to connect the compressor outlet and the indoor heat exchanger, and the air-conditioning system heats the indoor environment only through the indoor unit.

[0026] In an optional technical solution of the control method of the air conditioning system, the control method further includes the following steps:

[0027] Receiving a command to operate a conventional cooling mode;

[0028] The compressor is controlled to be turned on, the reversing valve is controlled to switch to connect the compressor outlet with the outdoor heat exchanger, the fluorine pump is turned off, and the auxiliary circuit switch valve is closed.

[0029] When the above technical solution is adopted, when the air-conditioning system is in normal cooling, the compressor is started, the fluorine pump is turned off, the auxiliary circuit switch valve is closed, the four-way valve is switched to connect the compressor outlet and the outdoor heat exchanger, and the air-conditioning system cools the indoor environment only through the indoor unit.

[0030] In an optional technical solution of the control method of the above air-conditioning system, the air-conditioning system further comprises an auxiliary refrigerant branch, one end of the auxiliary refrigerant branch is connected to the first end of the auxiliary refrigerant pipeline and the pipeline between the auxiliary heat exchanger, the other end of the auxiliary refrigerant branch is connected to the pipeline between the reversing valve and the indoor heat exchanger, and a branch switch valve is provided on the auxiliary refrigerant branch;

[0031] The control method further comprises the following steps:

[0032] When the air conditioning system is running in the conventional heating mode, it receives a command to run the floor heating;

[0033] The branch switch valve is controlled to open, and the auxiliary switch valve is controlled to open.

[0034] When the above technical solution is adopted, when the temperature of the floor heating pipeline is too low, the branch switch valve is opened, and the air conditioning system heats the room while also providing heat for the floor heating.

[0035] In an optional technical solution of the control method of the air conditioning system, the control method further includes the following steps:

[0036] When the air conditioning system operates in a conventional cooling mode, obtaining the outdoor ambient temperature;

[0037] When the outdoor ambient temperature is greater than a preset temperature, the fluorine pump is controlled to start, and the auxiliary circuit switch valve is opened.

[0038] When the above technical solution is adopted, high-temperature refrigeration is automatically operated by detecting the outdoor ambient temperature. When indoor cooling is performed in hot weather, the refrigerant is liquefied through the floor heating pipeline and the outdoor heat exchanger to increase the supercooling degree. The system pressure can be kept normal without reducing the frequency of the compressor, so as to stabilize the indoor temperature.

[0039] In an optional technical solution of the control method of the air conditioning system, the control method further includes the following steps:

[0040] When the air conditioning system is operating in a conventional cooling mode, an instruction to operate high-temperature cooling is received;

[0041] The fluorine pump is controlled to start, and the auxiliary circuit switch valve is opened.

[0042] When the above technical solution is adopted, high temperature refrigeration is operated by sending instructions by the user.

[0043] It can be understood by those skilled in the art that the air conditioning system of the present invention includes a refrigerant circulation loop and a compressor, a reversing valve, an indoor heat exchanger and an outdoor heat exchanger arranged on the refrigerant circulation loop. The air conditioning system also includes an auxiliary heat exchanger, an auxiliary refrigerant pipeline and a floor heating pipeline, the auxiliary refrigerant pipeline and the floor heating pipeline exchange heat through the auxiliary heat exchanger, the first end of the auxiliary refrigerant pipeline is connected to the pipeline between the reversing valve and the outdoor heat exchanger, the second end of the auxiliary refrigerant pipeline is connected to the pipeline between the indoor heat exchanger and the outdoor heat exchanger, and a fluorine pump and an auxiliary switch valve are arranged on the auxiliary refrigerant pipeline.

[0044] When the above technical solution is adopted, when the air conditioning system defrosts the outdoor heat exchanger, the compressor is stopped, the fluorine pump is turned on, and the auxiliary circuit switch valve is opened. The refrigerant in the pipeline circulates into the auxiliary refrigerant pipeline and exchanges heat with the floor heating water in the auxiliary circuit heat exchanger. After the refrigerant absorbs the heat of the floor heating water, it enters the outdoor heat exchanger to defrost the outdoor heat exchanger. During the defrosting process of the air conditioning system of the present invention, the refrigerant absorbs the residual heat of the floor heating pipeline to defrost the outdoor heat exchanger, and does not take heat from the indoor environment, thereby reducing the temperature fluctuation of the indoor environment.

[0045] When the outdoor ambient temperature is high, the heat dissipation effect of the outdoor heat exchanger is poor. In order to prevent the pressure in the air-conditioning system from reaching the alarm threshold and causing the compressor to reduce the frequency and reduce the cooling effect, during high-temperature cooling, the compressor is started, the reversing valve is switched to connect the compressor outlet and the outdoor heat exchanger, and the fluorine pump is turned on, and the auxiliary switch valve is opened. The low-temperature water through the floor heating pipeline and the outdoor heat exchanger jointly dissipate the heat for the refrigerant, and the refrigerant participates in the refrigeration cycle after liquefaction. The structure of this air-conditioning system can achieve efficient cooling in summer on the basis of achieving floor heating defrosting in winter, and can keep the indoor temperature stable regardless of low or high temperature weather. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0047] Figure 1 is a schematic diagram of a refrigerant circulation circuit of an air-conditioning system of the present invention;

[0048] Figure 2 is a schematic diagram of the refrigerant flow direction of the air conditioning system of the present invention in the defrosting mode;

[0049] Figure 3 is a schematic diagram of the refrigerant flow direction of the air-conditioning system of the present invention during conventional heating;

[0050] Figure 4 is a schematic diagram of the refrigerant flow direction during conventional refrigeration of the air-conditioning system of the present invention;

[0051] Figure 5 It is a schematic diagram of the refrigerant flow direction during floor heating of the air-conditioning system of the present invention;

[0052] Figure 6 It is a schematic diagram of the refrigerant flow direction of the air-conditioning system of the present invention during high-temperature cooling;

[0053] Figure 7 It is a flow chart of main steps of the control method of the air conditioner of the present invention.

[0054] List of reference numerals:

[0055] 1. Refrigerant circulation circuit; 11. Compressor; 12. Reversing valve; 13. Indoor heat exchanger; 131. Indoor throttling device; 14. Outdoor heat exchanger; 15. Main circuit throttling device;

[0056] 2. Auxiliary refrigerant pipeline; 21. Auxiliary heat exchanger; 22. Fluorine pump; 23. Auxiliary switch valve;

[0057] 3. Floor heating pipeline;

[0058] 4. Auxiliary refrigerant branch; 41. Branch switch valve;

[0059] 5. Oil-gas separator; 6. Gas-liquid separator. DETAILED DESCRIPTION

[0060] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0061] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection between two elements, or it can be indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In order to solve the problem that the existing air-conditioning system causes large fluctuations in indoor temperature when defrosting in low-temperature weather and cooling in high-temperature weather, the present invention provides an air-conditioning system.

[0063] Reference Figure 1 The air conditioning system of the present invention includes a refrigerant circulation loop 1 and a compressor 11, a reversing valve 12, an indoor heat exchanger 13 and an outdoor heat exchanger 14 arranged on the refrigerant circulation loop 1.

[0064] The refrigerant circulation loop 1 is a refrigerant loop for realizing conventional refrigeration or conventional heating of the air-conditioning system. When the air-conditioning system is used for conventional heating, the low-temperature and low-pressure gaseous refrigerant is compressed to become a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant releases heat and condenses into a high-temperature and high-pressure liquid refrigerant in the indoor heat exchanger 13. The liquid refrigerant enters the outdoor heat exchanger 14 to absorb heat and evaporates into a low-temperature and low-pressure gaseous refrigerant. The gaseous refrigerant is then sucked into the compressor 11 and compressed to enter the next cycle. During the whole process, the refrigerant releases heat in the indoor heat exchanger 13 and absorbs heat in the outdoor heat exchanger 14 to achieve the purpose of heating. During conventional refrigeration, the high-temperature and high-pressure gaseous refrigerant of the compressor 11 enters the outdoor heat exchanger 14 to release heat and condense, and then enters the indoor heat exchanger 13 to absorb heat to cool the room.

[0065] Reference Figure 2 The air conditioning system also includes an auxiliary refrigerant pipeline 2, an auxiliary heat exchanger 21 and a floor heating pipeline 3. The floor heating pipeline 3 is provided with flowing hot water to heat the indoor space. The refrigerant in the auxiliary refrigerant pipeline 2 and the water in the floor heating pipeline 3 exchange heat in the auxiliary heat exchanger 21. The first end of the auxiliary refrigerant pipeline 2 is connected to the pipeline between the reversing valve 12 and the outdoor heat exchanger 14, and the second end of the auxiliary refrigerant pipeline 2 is connected to the pipeline between the indoor heat exchanger 13 and the outdoor heat exchanger 14. A fluorine pump 22 is provided on the auxiliary refrigerant pipeline 2, which is used to circulate the refrigerant in the pipeline. The auxiliary refrigerant pipeline 2 is also provided with an auxiliary switch valve 23.

[0066] Optionally, the auxiliary circuit switch valve 23 is an auxiliary circuit throttling device, and the auxiliary circuit throttling device is located between the auxiliary circuit heat exchanger 21 and the second end of the auxiliary circuit refrigerant pipeline. The auxiliary circuit throttling device not only controls the on-off of the pipeline, but also regulates the flow rate of the refrigerant entering the auxiliary circuit heat exchanger 21. However, those skilled in the art can also replace the auxiliary circuit throttling device with other switch valves that only play an on-off role according to actual needs. The present invention does not impose any restrictions on the type of the auxiliary circuit switch valve 23, and all fall within the protection scope of the present invention.

[0067] Continue to refer to Figure 2 When the air conditioning system defrosts the outdoor heat exchanger 14, the compressor 11 stops, the fluorine pump 22 starts, and the auxiliary circuit throttling device starts. The refrigerant in the pipeline circulates into the auxiliary refrigerant pipeline 2, and exchanges heat with the floor heating pipeline 3 in the auxiliary circuit heat exchanger 21. After absorbing the heat of the floor heating pipeline 3, the refrigerant enters the outdoor heat exchanger 14 to defrost the outdoor heat exchanger 14.

[0068] Reference Figure 3 When the air conditioning system is heating, the compressor 11 is started, the fluorine pump 22 is turned off, the auxiliary circuit throttling device is turned off, and the reversing valve 12 is switched to connect the air outlet of the compressor 11 and the indoor heat exchanger 13.

[0069] Reference Figure 4When the air conditioner is cooling, the compressor 11 is started, the fluorine pump 22 is turned off, the auxiliary circuit throttling device is turned off, and the reversing valve 12 is switched to connect the air outlet of the compressor 11 and the outdoor heat exchanger 14. Figure 6 When the outdoor ambient temperature is high, the heat dissipation effect of the outdoor heat exchanger 14 is poor. In order to prevent the pressure in the air-conditioning system from reaching the alarm threshold and causing the compressor to reduce its frequency, the fluorine pump 22 is turned on and the auxiliary circuit throttling device 23 is opened. The low-temperature water through the floor heating pipeline 3 and the outdoor heat exchanger 14 cool the refrigerant together, and the refrigerant participates in the refrigeration cycle after liquefaction.

[0070] During the defrosting process of the air conditioning system of the present invention, the refrigerant absorbs the residual heat of the floor heating pipe 3 and defrosts the outdoor heat exchanger 14 without taking heat from the indoor environment, thereby ensuring less temperature fluctuations in the indoor environment during defrosting. In addition, the structure of the air conditioning system can also dissipate heat for the refrigerant through the floor heating pipe 3 and the outdoor heat exchanger 14, thereby increasing the degree of supercooling and achieving stable indoor refrigeration. Therefore, the air conditioning system can maintain a stable indoor temperature regardless of whether it is low temperature weather or high temperature weather.

[0071] Specifically, refer to Figure 2 In a possible implementation, the air conditioning system includes a refrigerant circulation loop 1 and a compressor 11, a four-way valve, an indoor heat exchanger 13, a main throttling device 15 and an outdoor heat exchanger 14 arranged on the refrigerant circulation loop 1. The main throttling device 15 throttles the refrigerant in the refrigerant pipeline to adjust the flow rate. The two indoor heat exchangers 13 are connected in parallel through pipelines, and indoor throttling devices 131 are respectively arranged on the parallel pipelines to adjust the refrigerant entering the indoor heat exchanger 13. The two outdoor heat exchangers 14 are connected in parallel through pipelines. The structure of the reversing valve 12 is not limited to a four-way valve, it can also be a three-way valve or a five-way valve, etc., as long as the corresponding flow direction of the refrigerant can be achieved. Those skilled in the art can set the specific type and structure of the reversing valve 12 according to actual needs, and all fall within the protection scope of the present invention.

[0072] The air conditioning system also includes an auxiliary refrigerant pipeline 2, an auxiliary heat exchanger 21 and a floor heating pipeline 3. The first end of the auxiliary refrigerant pipeline 2 is connected to the pipeline between the four-way valve and the outdoor heat exchanger 14, and the second end of the auxiliary refrigerant pipeline 2 is connected to the pipeline between the indoor heat exchanger 13 and the outdoor heat exchanger 14. Specifically, the auxiliary heat exchanger 21 is provided with a first heat exchange tube and a second heat exchange tube for mutual heat exchange, the floor heating pipeline 3 is connected to the first heat exchange tube, and the auxiliary refrigerant pipeline 2 is connected to the second heat exchange tube, so that heat is exchanged between the refrigerant in the auxiliary refrigerant pipeline 2 and the water in the floor heating pipeline 3. A fluorine pump 22 is provided on the auxiliary refrigerant pipeline 2, which is used to circulate the refrigerant in the pipeline. An auxiliary throttling device is provided on the auxiliary refrigerant pipeline 2, and the auxiliary throttling device is located between the auxiliary heat exchanger 21 and the second end of the auxiliary refrigerant pipeline 2.

[0073] The air conditioning system further includes an auxiliary refrigerant branch 4, one end of which is connected to the pipeline between the fluorine pump 22 and the auxiliary heat exchanger 21, and the other end of which is connected to the pipeline between the four-way valve and the indoor heat exchanger 13. A branch switch valve 41 is provided on the auxiliary refrigerant branch 4. The present invention does not make specific settings for the locations of the fluorine pump 22 and the auxiliary throttling device, and those skilled in the art can select specific locations according to actual needs and all fall within the protection scope of the present invention.

[0074] Continue to refer to Figure 2 When running the defrosting mode, the compressor 11 is stopped, the branch switch valve 41 is closed, the fluorine pump 22 is turned on, and the auxiliary circuit throttling device is turned on. During defrosting, the compressor 11 is stopped, and the fluorine pump 22 is used to drive the refrigerant to flow and exchange heat with the floor heating to avoid liquid hammer and low pressure failure of the compressor 11.

[0075] Reference Figure 3 When the air conditioning system is heating normally, the compressor 11 is started, the branch switch valve 41 is closed, the fluorine pump 22 is closed, the main throttling device 15 is opened, the auxiliary throttling device is closed, and the four-way valve is switched to connect the compressor 11 outlet and the indoor heat exchanger 13. The air conditioning system heats the indoor environment only through the indoor unit. When the temperature of the floor heating pipe 3 is too low, the air conditioning system heats the indoor environment while also providing floor heating. Specifically, open the branch switch valve 41, refer to Figure 5 Part of the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 11 enters the indoor heat exchanger 13 to heat the indoor room, and the other part enters the auxiliary refrigerant pipeline 2 through the auxiliary refrigerant branch 4. The auxiliary refrigerant pipeline 2 and the floor heating pipeline 3 exchange heat in the auxiliary heat exchanger 21, and the floor heating pipeline 3 absorbs the refrigerant heat.

[0076] Reference Figure 4 When the air-conditioning system is in normal cooling mode, the compressor 11 is started, the branch switch valve 41 is closed, the fluorine pump 22 is turned off, the main throttling device 15 is turned on, the auxiliary throttling device is turned off, and the four-way valve is switched to connect the compressor 11 outlet and the outdoor heat exchanger 14. The air-conditioning system cools the indoor environment only through the indoor unit.

[0077] When the outdoor ambient temperature is high, in order to prevent the pressure in the air conditioning system from reaching the alarm threshold, the fluorine pump 22 is turned on and the auxiliary circuit throttling device is opened. Figure 6 Part of the high-temperature and high-pressure gaseous refrigerant at the outlet of the compressor 11 enters the outdoor heat exchanger 14 for heat dissipation, and the other part enters the auxiliary refrigerant pipeline 2. The auxiliary refrigerant pipeline 2 and the floor heating pipeline 3 exchange heat in the auxiliary heat exchanger 21. The floor heating pipeline 3 absorbs the heat of the refrigerant, and then the refrigerant enters the indoor heat exchanger 13 to absorb the indoor heat for indoor cooling. When the outdoor ambient temperature is high, the low-temperature water in the floor heating pipeline 3 absorbs the heat of the refrigerant, increases the degree of supercooling, prevents the system from entering high-pressure protection and reducing the operating frequency, and ensures the indoor temperature is stable.

[0078] Furthermore, an oil-gas separator 5 is provided between the four-way valve and the air outlet of the compressor 11, which is used to separate the compressor oil and the refrigerant. A gas-liquid separator 6 is provided between the air inlet of the compressor 11 and the four-way valve, which is used to separate the liquid refrigerant in the gas-liquid mixed phase refrigerant, and the gaseous refrigerant returns to the air inlet of the compressor 11.

[0079] As stated in the first paragraph of this section, the above implementation mode is only used to illustrate the principles of the present invention and is not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0080] In addition, refer to Figure 7 The present invention also provides a control method for an air conditioning system, the control method for an air conditioning system comprising the following steps:

[0081] Step S10: receiving an instruction to operate the defrost mode;

[0082] Step S11: Control the compressor to stop, the fluorine pump to start, the auxiliary circuit throttling device to open, and the branch circuit switch valve to close.

[0083] Step S20: receiving an instruction to operate a conventional heating mode;

[0084] Step S21: Control the compressor to start, switch the four-way valve to connect the compressor outlet with the indoor heat exchanger, start the main throttling device, turn off the fluorine pump, turn off the auxiliary throttling device, and close the branch switch valve;

[0085] Step S22: receiving an instruction to operate floor heating when the air conditioning system operates in a conventional heating mode;

[0086] Step S23: Control the branch switch valve to open and the auxiliary circuit throttling device to open.

[0087] Step S30: receiving an instruction to operate a conventional cooling mode;

[0088] Step S31: Control the compressor to start, switch the four-way valve to connect the compressor outlet and the outdoor heat exchanger, start the main throttling device, turn off the fluorine pump, turn off the auxiliary throttling device, and close the branch switch valve.

[0089] When the outdoor ambient temperature is high and the cooling is running, the heat dissipation effect of the outdoor heat exchanger 14 is poor. The air conditioning system protects the system by reducing the compressor frequency to prevent the system from reporting a high-voltage fault. However, when cooling at high temperatures, the cooling capacity will be reduced by reducing the frequency to protect the system. Therefore, in order to solve this problem, in a possible implementation, the control method of the air conditioning system also includes:

[0090] Step S32: When the air conditioning system is operating in a conventional cooling mode, an instruction to operate high temperature cooling is received;

[0091] Step S33: Control the fluorine pump to start and the auxiliary circuit throttling device to open.

[0092] In summer, indoor heating is not required, so the water temperature in the floor heating pipeline 3 is relatively low. When the outdoor ambient temperature is high, both the fluorine pump 22 and the auxiliary circuit throttling device are turned on, so that part of the refrigerant at the compressor outlet enters the outdoor heat exchanger 14 for heat dissipation and liquefaction, and the other part enters the auxiliary circuit heat exchanger 3 for heat exchange with the floor heating pipeline 3. The floor heating pipeline 3 absorbs the heat of the refrigerant, and the cooled refrigerant enters the indoor heat exchanger 13 to participate in the refrigeration cycle. In this way, when indoor cooling is performed in hot weather, the refrigerant is cooled and liquefied through the floor heating pipeline 3 and the outdoor heat exchanger 14, thereby increasing the degree of supercooling, and the system pressure can be kept normal without reducing the frequency of the compressor, so as to stabilize the indoor temperature.

[0093] In another embodiment, high temperature cooling is automatically operated by detecting the outdoor ambient temperature.

[0094] Specifically, after step S40, the steps are performed: obtaining the outdoor ambient temperature;

[0095] Steps: When the outdoor ambient temperature is greater than the preset temperature, the compressor is controlled to start, the four-way valve is switched to connect the compressor outlet and the outdoor heat exchanger, the main throttling device is turned on, the fluorine pump is turned on, the auxiliary throttling device is opened, and the branch switch valve is closed.

[0096] When the outdoor ambient temperature is less than or equal to the preset temperature, step S41 is executed.

[0097] Those skilled in the art can understand that the above-mentioned air conditioning system also includes some other well-known structures, such as processors, controllers, memories, etc., wherein the memories include but are not limited to random access memory, flash memory, read-only memory, programmable read-only memory, volatile memory, non-volatile memory, serial memory, parallel memory or registers, etc., and the processor includes but is not limited to CPLD / FPGA, DSP, ARM processor, MIPS processor, etc. In order to unnecessarily obscure the embodiments of the present disclosure, these well-known structures are not shown in the drawings.

[0098] Although the various steps in the above embodiment are described in the above order, those skilled in the art can understand that in order to achieve the effect of the present embodiment, different steps do not have to be executed in such an order, and they can be executed simultaneously (in parallel) or in a reverse order. Those skilled in the art can set the order of the steps as needed, and all of them fall within the protection scope of the present invention.

[0099] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: The air conditioning system comprises a refrigerant circulation circuit (1), and a compressor (11), a reversing valve (12), an indoor heat exchanger (13), and an outdoor heat exchanger (14) arranged on the refrigerant circulation circuit (1); The air conditioning system also includes an auxiliary heat exchanger (21), an auxiliary refrigerant pipeline (2) and a floor heating pipeline (3); the auxiliary refrigerant pipeline (2) and the floor heating pipeline (3) exchange heat through the auxiliary heat exchanger (21); the first end of the auxiliary refrigerant pipeline (2) is connected to the pipeline between the reversing valve (12) and the outdoor heat exchanger (14); the second end of the auxiliary refrigerant pipeline (2) is connected to the pipeline between the indoor heat exchanger (13) and the outdoor heat exchanger (14); and a fluorine pump (22) and an auxiliary switch valve (23) are provided on the auxiliary refrigerant pipeline (2).

2. The air conditioning system according to claim 1, characterized in that: The air conditioning system also includes an auxiliary refrigerant branch (4), one end of the auxiliary refrigerant branch (4) is connected to the first end of the auxiliary refrigerant pipeline (2) and the pipeline between the auxiliary pipeline heat exchanger (21), and the other end of the auxiliary refrigerant branch (4) is connected to the pipeline between the reversing valve (12) and the indoor heat exchanger (13), and a branch switch valve (41) is provided on the auxiliary refrigerant branch (4).

3. The air conditioning system according to claim 1, characterized in that: The refrigerant circulation loop (1) is provided with a main circuit throttling device (15).

4. The air conditioning system according to claim 1, characterized in that: An oil-gas separator (5) is provided between the reversing valve (12) and the air outlet of the compressor (11); and / or a gas-liquid separator (6) is provided between the air inlet of the compressor (11) and the reversing valve (12).

5. A control method for an air conditioning system, characterized in that: The air conditioning system of the present invention comprises a refrigerant circulation circuit (1), and a compressor (11), a reversing valve (12), an indoor heat exchanger (13), and an outdoor heat exchanger (14) arranged on the refrigerant circulation circuit (1); The air conditioning system further comprises an auxiliary heat exchanger (21), an auxiliary refrigerant pipeline (2) and a floor heating pipeline (3); the auxiliary refrigerant pipeline (2) and the floor heating pipeline (3) exchange heat through the auxiliary heat exchanger (21); a first end of the auxiliary refrigerant pipeline (2) is connected to a pipeline between the reversing valve (12) and the outdoor heat exchanger (14); a second end of the auxiliary refrigerant pipeline (2) is connected to a pipeline between the indoor heat exchanger (13) and the outdoor heat exchanger (14); a fluorine pump (22) and an auxiliary switch valve (23) are provided on the auxiliary refrigerant pipeline (2); The control method comprises the following steps: Receiving a command to operate a defrost mode; The compressor is controlled to stop, the fluorine pump is turned on, and the auxiliary circuit switch valve is opened.

6. The control method of the air conditioning system according to claim 5, characterized in that: The control method further comprises the following steps: Receiving a command to operate a conventional heating mode; The compressor is controlled to be turned on, the reversing valve is controlled to switch to connect the compressor outlet with the indoor heat exchanger, the fluorine pump is turned off, and the auxiliary circuit switch valve is closed.

7. The air conditioner control method according to claim 5, characterized in that: The control method further comprises the following steps: Receiving a command to operate a conventional cooling mode; The compressor is controlled to be turned on, the reversing valve is controlled to be switched to connect the compressor outlet with the outdoor heat exchanger, the fluorine pump is turned off, and the auxiliary circuit switch valve is closed.

8. The air conditioner control method according to claim 6, characterized in that: The air conditioning system further comprises an auxiliary refrigerant branch (4), one end of the auxiliary refrigerant branch (4) being connected to the first end of the auxiliary refrigerant pipeline (2) and the pipeline between the auxiliary pipeline heat exchanger (21), the other end of the auxiliary refrigerant branch (4) being connected to the pipeline between the reversing valve (12) and the indoor heat exchanger (13), and a branch switch valve (41) being provided on the auxiliary refrigerant branch (4); The control method further comprises the following steps: When the air conditioning system is running in the conventional heating mode, it receives a command to run the floor heating; The branch switch valve is controlled to open, and the auxiliary switch valve is controlled to open.

9. The control method of the air conditioning system according to claim 7, characterized in that: The control method further comprises the following steps: When the air conditioning system operates in a conventional cooling mode, obtaining the outdoor ambient temperature; When the outdoor ambient temperature is greater than a preset temperature, the fluorine pump is controlled to start, and the auxiliary circuit switch valve is opened.

10. The control method of the air conditioning system according to claim 7, characterized in that: The control method further comprises the following steps: When the air conditioning system is operating in a conventional cooling mode, an instruction to operate high-temperature cooling is received; The fluorine pump is controlled to start, and the auxiliary circuit switch valve is opened.

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