Air conditioning system

Abstract

The utility model relates to an air conditioning system. The air conditioning system comprises a refrigerant circulation loop; the liquid storage container is used for storing a refrigerant and is provided with a liquid inlet and a liquid outlet; the liquid inlet pipeline is provided with a liquid inlet valve, the first end of the liquid inlet pipeline is communicated with the liquid inlet, and the second end of the liquid inlet pipeline is communicated with at least one of the low-pressure side pipeline, the medium-pressure side pipeline and the high-pressure side pipeline; the liquid discharging pipeline is provided with a liquid discharging valve, the first end of the liquid discharging pipeline is communicated with the liquid outlet, and the second end of the liquid discharging pipeline is communicated with at least one of the low-pressure side pipeline, the medium-pressure side pipeline and the high-pressure side pipeline; under the condition that the liquid inlet valve is in the on state, the pressure of the first end of the liquid inlet branch is smaller than that of the second end of the liquid inlet branch, and therefore the refrigerant is stored in the liquid storage container through the pressure difference. And under the condition that the drain valve is in the on state, the pressure of the first end of the drain branch is larger than that of the second end of the drain branch, so that the refrigerant in the liquid storage container is discharged through the pressure difference.

Description

Technical Field

[0001] The present disclosure relates to the field of refrigeration technology, and in particular to an air-conditioning system. Background Art

[0002] A multi-split air conditioning system is an outdoor unit that can connect to multiple indoor units. Its refrigeration system is an outdoor unit that can transport refrigerant liquid to several indoor units through pipelines. By controlling the refrigerant circulation volume of the compressor and the refrigerant flow entering each indoor heat exchanger, the indoor cooling and heating load requirements can be met in a timely manner.

[0003] The current multi-split air conditioning system can only realize conventional cooling mode and heating mode, and the heat exchange effect is poor. Utility Model Content

[0004] Some embodiments of the present disclosure provide an air-conditioning system that can achieve a better heat exchange effect.

[0005] The present disclosure provides an air conditioning system, comprising:

[0006] The refrigerant circulation loop is equipped with a compressor, evaporator and condenser. The high-pressure side pipeline is between the compressor exhaust port and the condenser, the medium-pressure side pipeline is between the condenser and the evaporator, and the low-pressure side pipeline is between the evaporator and the compressor suction port;

[0007] A liquid storage container, used for storing refrigerant and having a liquid inlet and a liquid outlet;

[0008] a liquid inlet pipeline, on which a liquid inlet valve having an on state and an off state is provided, a first end of the liquid inlet pipeline being connected to the liquid inlet, and a second end of the liquid inlet pipeline being connected to at least one of the low-pressure side pipeline, the medium-pressure side pipeline, and the high-pressure side pipeline; and

[0009] a liquid discharge pipeline, on which a liquid discharge valve having an on state and an off state is provided, a first end of the liquid discharge pipeline being connected to the liquid outlet, and a second end of the liquid discharge pipeline being connected to at least one of the low-pressure side pipeline, the medium-pressure side pipeline, and the high-pressure side pipeline;

[0010] Among them, when the liquid inlet valve is in the on state, the pressure at the first end of the liquid inlet pipeline is less than the pressure at the second end, so that the refrigerant in the refrigerant circulation loop is stored in the liquid storage container by utilizing the pressure difference; when the liquid discharge valve is in the on state, the pressure at the first end of the liquid discharge pipeline is greater than the pressure at the second end, so that the refrigerant in the liquid storage container is discharged to the refrigerant circulation loop by utilizing the pressure difference.

[0011] In some embodiments, the liquid storage container further comprises a pressure regulating port, and the air conditioning system further comprises:

[0012] A pressure relief branch is provided with a balancing valve having an on state and an off state, and a first end of the pressure relief branch is connected to the pressure regulating port;

[0013] When the balancing valve is in the on state, the pressure in the liquid storage container is released through the pressure relief branch.

[0014] In some embodiments, the liquid storage container further comprises a pressure regulating port, and the air conditioning system further comprises:

[0015] A pressurizing branch is provided with a pressurizing valve having an on state and an off state, a first end of the pressurizing branch is connected to the pressure regulating port, and a second end of the pressurizing branch is connected to the high-pressure side pipeline;

[0016] When the pressure valve is in the on state, the high-pressure side pipeline pressurizes the liquid storage container.

[0017] In some embodiments, the liquid inlet pipeline includes a first liquid inlet branch, a second end of the first liquid inlet branch is connected to the medium-pressure side pipeline, and the liquid inlet valve includes a first liquid inlet valve provided on the first liquid inlet branch; and

[0018] The drain pipeline includes a first drain branch, the second end of the first drain branch is configured to communicate with the low-pressure side pipeline in the cooling mode and to communicate with the high-pressure side pipeline in the heating mode, and the drain valve includes a first drain valve arranged on the first drain branch.

[0019] In some embodiments, the refrigerant circulation circuit further includes a four-way reversing valve and a gas-liquid separator, wherein the four-way reversing valve is used to perform reversing when switching between the cooling mode and the heating mode, and the gas-liquid separator is provided on the pipeline between the four-way reversing valve and the compressor suction port;

[0020] Among them, the air-conditioning system also includes a pressurization branch, the second end of the first liquid discharge branch is connected to the pipeline between the four-way reversing valve and the evaporator, the second end of the pressurization branch is connected to the pipeline between the exhaust port of the compressor and the four-way reversing valve, and the second end of the pressure relief branch is connected between the inlet of the gas-liquid separator and the four-way reversing valve.

[0021] In some embodiments, the liquid inlet and the pressure regulating port are arranged in the upper area of ​​the liquid storage container, and the liquid outlet is arranged in the lower area of ​​the liquid storage container.

[0022] In some embodiments,

[0023] The liquid inlet pipeline includes a second liquid inlet branch, the second end of the second liquid inlet branch is connected to the low-pressure side pipeline, and the liquid inlet valve further includes a second liquid inlet valve provided on the second liquid inlet branch; and / or

[0024] The liquid discharge pipeline includes a second liquid discharge branch, the second end of the second liquid discharge branch is communicated with the medium pressure side pipeline, and the liquid discharge valve also includes a second liquid discharge valve arranged on the second liquid discharge branch.

[0025] In some embodiments, the refrigerant circulation circuit further includes a four-way reversing valve and a gas-liquid separator, wherein the four-way reversing valve is used to perform reversing when switching between the cooling mode and the heating mode, and the gas-liquid separator is provided on the pipeline between the four-way reversing valve and the compressor suction port;

[0026] The second end of the second liquid inlet branch is connected between the four-way reversing valve and the inlet of the gas-liquid separator.

[0027] In some embodiments, a main pipeline section is formed between the four-way reversing valve and the second end of the second liquid inlet branch, a branch pipeline section is formed between the second end of the second liquid inlet branch and the inlet of the gas-liquid separator, and the main pipeline section is connected to the second liquid inlet branch and the branch pipeline section;

[0028] The refrigerant flow resistance of the branch pipe section is greater than the refrigerant flow resistance of the second liquid inlet branch.

[0029] In some embodiments, the height of the second liquid inlet branch is lower than the length of the branch pipe section close to the second end of the second liquid inlet branch; and / or

[0030] The branch pipe section is provided with a resistance increasing portion, which is configured to increase the refrigerant flow resistance of the branch pipe section.

[0031] In some embodiments, the liquid inlet pipeline includes a second liquid inlet branch and a pressurizing branch, the second end of the second liquid inlet branch is connected to the low-pressure side pipeline, and the liquid inlet valve includes a second liquid inlet valve provided on the second liquid inlet branch; the pressurizing branch is provided with a pressurizing valve having an on state and an off state, the first end of the pressurizing branch is connected to the pressure regulating port of the liquid storage container, and the second end of the pressurizing branch is connected to the high-pressure side pipeline;

[0032] The drain pipeline includes a first drain branch and a second drain branch, wherein the second end of the first drain branch is configured to communicate with the low-pressure side pipeline in cooling mode and communicate with the high-pressure side pipeline in heating mode; the second end of the second drain branch is connected to the medium-pressure side pipeline; the drain valve includes a first drain valve provided on the first drain branch and a second drain valve provided on the second drain branch;

[0033] The refrigerant circulation loop is provided with a second control valve on the pipeline section between the second end of the second liquid inlet branch and the air intake of the compressor; the liquid storage container has an air outlet, and the air-conditioning system also includes a first control valve, the first end of the first control valve is connected to the air outlet, and the second end of the first control valve is connected to the pipeline section between the second control valve and the air intake of the compressor.

[0034] Based on the above technical solution, the present disclosure has at least the following beneficial effects:

[0035] A liquid storage container is added to the air-conditioning system of the embodiment of the present disclosure, and is connected to at least one of the low-pressure side pipeline, medium-pressure side pipeline and high-pressure side pipeline in the system through a liquid inlet valve and a liquid discharge valve that can realize the on-off function. On the basis of realizing the conventional refrigerant mode and the heating mode, the excess refrigerant in the refrigerant circulation loop can be collected from a specific pressure side by using the pressure difference according to the actual heat exchange demand of the air-conditioning system, or the refrigerant in the liquid storage container can be discharged into the refrigerant circulation loop for replenishment according to the actual refrigerant demand, so as to achieve the best heat exchange effect and improve the heat exchange efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0037] Figure 1 This is a schematic diagram of the first embodiment of the air-conditioning system of the present disclosure in a conventional cooling mode;

[0038] Figure 2 This is a schematic diagram of the first embodiment of the air-conditioning system of the present disclosure in a conventional heating mode;

[0039] Figure 3 This is a schematic diagram of the first embodiment of the air-conditioning system of the present disclosure in a cooling and liquid collecting mode;

[0040] Figure 4 This is a schematic diagram of the first embodiment of the air-conditioning system of the present disclosure in the first cooling and liquid discharge mode;

[0041] Figure 5 This is a schematic diagram of the first embodiment of the air-conditioning system of the present disclosure in the second cooling and liquid discharge mode;

[0042] Figure 6 This is a schematic diagram of the first embodiment of the air-conditioning system of the present disclosure in a heating and liquid collecting mode;

[0043] Figure 7 This is a schematic diagram of the first embodiment of the air-conditioning system of the present disclosure in the first heating and liquid discharge mode;

[0044] Figure 8 This is a schematic diagram of the first embodiment of the air-conditioning system of the present disclosure in the second heating and liquid discharge mode, in which the pressurizing valve is opened first;

[0045] Figure 9 This is a schematic diagram of the first drain valve being opened when the first embodiment of the air-conditioning system of the present disclosure is in the second heating drain mode;

[0046] Figure 10 This is a schematic diagram of the second embodiment of the air-conditioning system of the present disclosure in a conventional cooling mode;

[0047] Figure 11 This is a schematic diagram of the second embodiment of the air-conditioning system of the present disclosure in a conventional heating mode;

[0048] Figure 12 This is a schematic diagram of the second embodiment of the air-conditioning system of the present disclosure in a cooling and liquid collecting mode;

[0049] Figure 13 This is a schematic diagram of the second embodiment of the air-conditioning system of the present disclosure in a cooling and liquid discharge mode;

[0050] Figure 14 This is a schematic diagram of the second embodiment of the air-conditioning system of the present disclosure in a heating and liquid collecting mode;

[0051] Figure 15 This is a schematic diagram of the second embodiment of the air-conditioning system disclosed herein in which the first liquid inlet valve is opened when the system is in the heating and liquid discharge mode;

[0052] Figure 16 This is a schematic diagram of the second embodiment of the air-conditioning system of the present disclosure in which the first drain valve is opened when the second embodiment is in the heating drain mode;

[0053] Figure 17 This is a schematic diagram of the third embodiment of the air-conditioning system of the present disclosure in a conventional cooling mode;

[0054] Figure 18 This is a schematic diagram of the third embodiment of the air-conditioning system of the present disclosure in a conventional heating mode;

[0055] Figure 19 This is a schematic diagram of the third embodiment of the air-conditioning system of the present disclosure in a cooling low-pressure side liquid collection mode;

[0056] Figure 20 This is a schematic diagram of the third embodiment of the air-conditioning system of the present disclosure in a cooling intermediate-pressure side liquid discharge mode;

[0057] Figure 21 This is a schematic diagram of the third embodiment of the air-conditioning system of the present disclosure in a heating and liquid collecting mode;

[0058] Figure 22 for Figure 21 A magnified view of point A in the figure;

[0059] Figure 23 for Figure 22 A schematic diagram of a modified example of ;

[0060] Figure 24 for Figure 22 A schematic diagram of another modified example of ;

[0061] Figure 25 This is a schematic diagram of the third embodiment of the air-conditioning system of the present disclosure in a heating and liquid discharge mode;

[0062] Figure 26 This is a schematic diagram of a fourth embodiment of the air-conditioning system of the present disclosure in a conventional cooling mode;

[0063] Figure 27 This is a schematic diagram of the fourth embodiment of the air-conditioning system of the present disclosure in a conventional heating mode;

[0064] Figure 28 This is a schematic diagram of the fourth embodiment of the air-conditioning system of the present disclosure in a cooling low-pressure side liquid collection mode;

[0065] Figure 29 This is a schematic diagram of the fourth embodiment of the air-conditioning system of the present disclosure in the cooling medium-pressure side liquid discharge mode;

[0066] Figure 30 This is a schematic diagram of the fourth embodiment of the air-conditioning system of the present disclosure in a heating low-pressure side liquid collection mode;

[0067] Figure 31 This is a schematic diagram of the fourth embodiment of the air-conditioning system of the present disclosure in a heating high-pressure side liquid discharge mode;

[0068] Figure 32 This is a schematic diagram of a fifth embodiment of the air-conditioning system of the present disclosure in a conventional cooling mode;

[0069] Figure 33 This is a schematic diagram of the fifth embodiment of the air-conditioning system of the present disclosure in a conventional heating mode;

[0070] Figure 34 This is a schematic diagram of the fifth embodiment of the air-conditioning system of the present disclosure in a cooling low-pressure side liquid collection mode;

[0071] Figure 35 This is a schematic diagram of the fifth embodiment of the air-conditioning system of the present disclosure in a cooling intermediate-pressure side liquid discharge mode;

[0072] Figure 36 This is a schematic diagram of the fifth embodiment of the air-conditioning system of the present disclosure in a heating low-pressure side liquid collection mode;

[0073] Figure 37 This is a schematic diagram of the fifth embodiment of the air-conditioning system disclosed herein in a heating high-pressure side liquid discharge mode.

[0074] It should be understood that the size of each part shown in the drawings is not drawn according to the actual proportional relationship.In addition, the same or similar reference numerals represent the same or similar components.

[0075] Description of Reference Numerals

[0076] 101. Compressor; 102. First pressure sensor; 103. Four-way reversing valve; 104. Outdoor heat exchanger; 105. Outdoor unit throttling element; 106. Liquid pipe valve; 107. Gas pipe valve; 108. Second pressure sensor; 109. Gas-liquid separator; 110. Liquid storage container; 111. Pressurizing valve; 112. Balancing valve; 113. First liquid inlet valve; 114. Unloading valve; 115. First liquid discharge valve; 116. First check valve; 117. Second liquid discharge valve; 118. Second check valve; 119. Second liquid inlet valve; 120. First control valve; 121. Second control valve; 122. Indoor heat exchanger

[0077] 1. First liquid inlet branch; 2. First liquid discharge branch; 3. Pressure relief branch; 4. Pressurization branch; 5. Second liquid inlet branch; 6. Second liquid discharge branch; 10. Resistance increasing part. DETAILED DESCRIPTION

[0078] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions, and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0079] The terms "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The terms "include" or "comprises" and similar terms mean that the elements before the term include the elements listed after the term, and do not exclude the possibility of also including other elements. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0080] In the present disclosure, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be not directly connected to the other device but with an intervening device.

[0081] All terms (including technical or scientific terms) used in this disclosure have the same meaning as those understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0082] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0083] Based on the above-mentioned embodiments of the present disclosure, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0084] The present disclosure provides an air conditioning system, such as Figures 1 to 37 As shown, five different types of embodiments are illustrated. In some embodiments, the air conditioning system includes:

[0085] The refrigerant circulation loop is provided with a compressor 101, an evaporator and a condenser. The high-pressure side pipeline is between the exhaust port of the compressor 101 and the condenser, the medium-pressure side pipeline is between the condenser and the evaporator, and the low-pressure side pipeline is between the evaporator and the air intake of the compressor 101;

[0086] The liquid storage container 110 is used to store the refrigerant and has a liquid inlet A and a liquid outlet B;

[0087] a liquid inlet pipeline, on which a liquid inlet valve having an on state and an off state is provided, a first end of the liquid inlet pipeline being connected to the liquid inlet port A, and a second end of the liquid inlet pipeline being connected to at least one of the low-pressure side pipeline, the medium-pressure side pipeline, and the high-pressure side pipeline; and

[0088] a liquid discharge pipeline, on which a liquid discharge valve having an on state and an off state is provided, a first end of the liquid discharge pipeline being connected to the liquid outlet B, and a second end of the liquid discharge pipeline being connected to at least one of the low-pressure side pipeline, the medium-pressure side pipeline, and the high-pressure side pipeline;

[0089] Among them, when the liquid inlet valve is in the on state, the pressure at the first end of the liquid inlet pipeline is less than the pressure at the second end, so that the refrigerant in the refrigerant circulation loop is stored in the liquid storage container 110 by utilizing the pressure difference; when the liquid discharge valve is in the on state, the pressure at the first end of the liquid discharge pipeline is greater than the pressure at the second end, so that the refrigerant in the liquid storage container 110 is discharged to the refrigerant circulation loop by utilizing the pressure difference.

[0090] Specifically, the refrigerant circulation loop is provided with a compressor 101, an evaporator and a condenser. Figure 1As shown, from the perspective of setting position, the refrigerant circulation loop includes the compressor 101, the outdoor heat exchanger 104 and the indoor heat exchanger 122. The indoor heat exchanger 122 is only Figure 1 As shown in the figure, the number can be one or more, and the indoor heat exchanger 122 is omitted in other figures. In the cooling state, the indoor heat exchanger 122 serves as an evaporator, and the outdoor heat exchanger 104 serves as a condenser. An outdoor unit throttling element 105 can also be provided at the downstream position of the outlet of the outdoor heat exchanger 104 to throttle and cool the refrigerant; in the heating state, the indoor heat exchanger 122 serves as a condenser, and the outdoor heat exchanger 104 serves as an evaporator. The cooling state and the heating state are switched by a four-way reversing valve 103. The liquid storage container 110 can be a liquid storage tank, etc., for temporarily storing the refrigerant in the refrigerant circulation loop. For example, the outdoor unit system can be a multi-split outdoor unit.

[0091] For example, the liquid storage container 110 may be provided in the external system, or may be provided between the internal system and the external system.

[0092] For example, the refrigerant circulation loop also includes a four-way reversing valve 103 and a gas-liquid separator 109. The four-way reversing valve 103 is used to reverse when switching between cooling mode and heating mode. The gas-liquid separator 109 is arranged on the pipeline between the four-way reversing valve 103 and the suction port of the compressor 101.

[0093] For such a system, Figure 1 As shown, in the cooling mode, the high-pressure side pipeline is the pipeline between the exhaust port of the compressor 101 and the condenser (outdoor heat exchanger 104), the medium-pressure side pipeline is the pipeline between the condenser (outdoor heat exchanger 104) and the evaporator (indoor heat exchanger), and the low-pressure side pipeline includes: from the evaporator (indoor heat exchanger) through the four-way reversing valve 103 to the inlet of the gas-liquid separator 109, and the pipeline between the outlet of the gas-liquid separator 109 and the air inlet of the compressor 101.

[0094] like Figure 2 As shown, in the heating mode, the high-pressure side pipeline is the pipeline between the exhaust port of the compressor 101 and the condenser (indoor heat exchanger), the medium-pressure side pipeline is the pipeline between the condenser (indoor heat exchanger) and the evaporator (outdoor heat exchanger 104), and the low-pressure side pipeline includes: from the evaporator (outdoor heat exchanger 104) through the four-way reversing valve 103 to the inlet of the gas-liquid separator 109, and the pipeline between the outlet of the gas-liquid separator 109 and the air inlet of the compressor 101.

[0095] The second end of the liquid inlet pipeline can be connected to one, two or three of the low-pressure side pipeline, medium-pressure side pipeline and high-pressure side pipeline of the external unit system as needed, so as to collect the refrigerant from different pressure sides into the liquid storage container 110 under different working modes. When collecting liquid, a pressure difference needs to be established at both ends of the liquid inlet pipeline so that the pressure at the first end of the liquid inlet pipeline is less than the pressure at the second end, so as to utilize the pressure difference to allow at least part of the refrigerant in the refrigerant circulation loop to enter the liquid storage container 110.

[0096] The second end of the discharge pipeline can be connected to one, two or three of the low-pressure side pipeline, medium-pressure side pipeline and high-pressure side pipeline of the external unit system as needed, so as to collect the refrigerant from different pressure sides into the liquid storage container 110, which is conducive to realizing different liquid collection modes. When collecting liquid, a pressure difference needs to be established at both ends of the liquid inlet pipeline so that the pressure at the first end of the liquid inlet pipeline is less than the pressure at the second end, so as to utilize the pressure difference to allow at least part of the refrigerant in the refrigerant circulation loop to enter the liquid storage container 110.

[0097] The second end of the liquid inlet pipeline is connected to one, two or three of the low-pressure side pipeline, the medium-pressure side pipeline and the high-pressure side pipeline, so that the refrigerant in the liquid storage container 110 is discharged to different pressure sides, which is conducive to realizing different discharge modes, so that the pressure at the first end of the discharge pipeline is greater than the pressure at the second end, so as to utilize the pressure difference to discharge at least part of the refrigerant in the liquid storage container 110 into the refrigerant circulation loop.

[0098] For example, the high-pressure side pipeline can be called the first pressure side pipeline, the medium-pressure side pipeline can be called the second pressure side pipeline, and the low-pressure side pipeline can be called the third pressure side pipeline, where the first pressure interval is higher than the second pressure interval, and the second pressure interval is higher than the third pressure interval.

[0099] This embodiment adds a liquid storage container 110 to the air-conditioning system, and connects it to at least one of the low-pressure side pipeline, medium-pressure side pipeline and high-pressure side pipeline in the system through a liquid inlet valve and a liquid discharge valve that can realize the on-off function. On the basis of realizing the conventional refrigerant mode and the heating mode, the pressure difference can be used to collect excess refrigerant in the refrigerant circulation loop from a specific pressure side according to the actual heat exchange demand of the air-conditioning system, or the refrigerant in the liquid storage container 110 can be discharged to the refrigerant circulation loop for replenishment according to the actual refrigerant demand, so as to achieve the best heat exchange effect and improve the heat exchange efficiency of the system.

[0100] This system can realize the refrigerant adjustment function and refrigerant transfer function at the same time.

[0101] In the refrigerant adjustment function, the refrigerant is stored and released through the liquid storage container 110, and the refrigerant amount in different operating modes is controlled, so that the system refrigerant circulation amount is consistent with the refrigerant demand in different operating modes, thereby achieving the best heat exchange effect.

[0102] In the refrigerant transfer function, the problem of system refrigerant accumulating on the outdoor low-pressure side after defrosting can be solved. The liquid refrigerant is stored in the liquid storage container 110 during defrosting. After the defrosting is completed and switched to the heating mode, the liquid refrigerant is discharged by relying on the high-pressure refrigerant on the exhaust side, so that the refrigerant can quickly participate in the heating cycle, reducing the time for the heating capacity to recover to the maximum output after defrosting, and improving the heating capacity.

[0103] In some embodiments, as Figure 1 As shown, the liquid storage container 110 also has a pressure regulating port C, and the air-conditioning system also includes: a pressure relief branch 3, on which is provided a balancing valve 112 with an on state and an off state, and the first end of the pressure relief branch 3 is connected to the pressure regulating port C. For example, the second end of the pressure relief branch 3 is connected to the low-pressure side pipeline, which is more conducive to liquid discharge, or it can also be connected to the medium-pressure side pipeline or other positions, as long as the pressure at the connected position is lower than the pressure in the liquid storage container 110; wherein, when the balancing valve 112 is in the on state, the pressure in the liquid storage container 110 is released through the pressure relief branch 3.

[0104] Specifically, the refrigerant circulation loop also includes a four-way reversing valve 103 and a gas-liquid separator 109. The four-way reversing valve 103 is used to reverse the direction when switching between cooling mode and heating mode. The gas-liquid separator 109 is arranged on the pipeline between the four-way reversing valve 103 and the air intake of the compressor 101. Based on this, the second end of the pressure relief branch 3 is connected to the pipeline at the inlet of the gas-liquid separator 109. The gaseous refrigerant discharged through the pressure relief branch 3 can first enter the gas-liquid separator 109 for gas-liquid separation, and then the gas can enter the compressor 101 to prevent liquid from being sucked into the compressor 101 and causing liquid hammer.

[0105] This embodiment provides a pressure relief branch 3 for the liquid storage container 110. When the pressure in the liquid storage container 110 is too high to collect liquid normally, the pressure in the liquid storage container 110 can be released to the low-pressure side pipeline by connecting the balancing valve 112, thereby ensuring a pressure difference at both ends of the liquid inlet valve, which is beneficial to further smooth liquid collection and efficient storage of the refrigerant.

[0106] In some embodiments, as Figure 1 As shown, the liquid storage container 110 also has a pressure regulating port C, and the air-conditioning system also includes: a pressurizing branch 4, on which is provided a pressurizing valve 111 with an on state and an off state, and the first end of the pressurizing branch 4 is connected to the pressure regulating port C; wherein, when the pressurizing valve 111 is in the on state, the high-pressure side pipeline pressurizes the liquid storage container 110.

[0107] Preferably, the second end of the pressurizing branch 4 is connected to the high-pressure side pipeline to provide more sufficient pressure in the liquid storage container, facilitating smooth liquid discharge. Optionally, the second end of the pressurizing branch 4 can also be connected to the medium-pressure side pipeline or a pipeline at another location, as long as the pressure is higher than that in the liquid storage container 110.

[0108] Specifically, the second end of the pressurizing branch 4 is connected to the pipeline between the exhaust port of the compressor 101 and the four-way reversing valve 103 .

[0109] This embodiment sets a pressurizing branch 4 for the liquid storage container 110. When the pressure in the liquid storage container 110 is low and the liquid cannot be discharged normally, the pressurizing valve 111 can be turned on, and the high pressure of the exhaust port of the compressor 101 can be introduced into the liquid storage container 110, ensuring that a pressure difference is established at both ends of the discharge valve, which is conducive to smooth discharge, so that the refrigerant in the liquid storage container 110 can be discharged efficiently, the discharge efficiency can be improved, the amount of refrigerant remaining in the liquid storage container 110 can be reduced, the larger refrigerant demand in the system can be met, and the heat exchange effect can be optimized.

[0110] In some embodiments, as Figure 1 As shown, the liquid inlet pipeline includes a first liquid inlet branch 1, the second end of the first liquid inlet branch 1 is connected to the medium pressure side pipeline, and the liquid inlet valve includes a first liquid inlet valve 113 provided on the first liquid inlet branch 1; and

[0111] The drain pipeline includes a first drain branch 2, the second end of the first drain branch 2 is configured to be connected to the low-pressure side pipeline in the cooling mode and to be connected to the high-pressure side pipeline in the heating mode, and the drain valve includes a first drain valve 115 arranged on the first drain branch 2.

[0112] In this embodiment, the second end of the first liquid inlet branch 1 is connected to the medium-pressure side pipeline. Since the medium-pressure side pipeline contains liquid refrigerant and has a relatively high pressure, it is beneficial to collect the liquid refrigerant in the medium-pressure side pipeline into the liquid storage container 110, thereby achieving smooth liquid collection. The second end of the first liquid discharge branch 2 is connected to the low-pressure side pipeline in the cooling mode, so that the refrigerant discharged from the liquid storage container 110 can be merged with the refrigerant flowing out of the evaporator; the second end of the first liquid discharge branch 2 is connected to the high-pressure side pipeline in the heating mode, so that the refrigerant adjustment and refrigerant transfer functions can be achieved simultaneously using the same liquid storage container 110. When the refrigerant transfer function is achieved, after the defrosting and heating operation are completed, the refrigerant in the liquid storage container 110 is discharged into the high-pressure side pipeline, so that the supplementary refrigerant can directly participate in the heat exchange on the indoor side, thereby improving the heating efficiency.

[0113] In some embodiments, as Figure 1 As shown, the refrigerant circulation circuit also includes a four-way reversing valve 103 and a gas-liquid separator 109. The four-way reversing valve 103 is used to switch between the cooling mode and the heating mode. The gas-liquid separator 109 is provided on the pipeline between the four-way reversing valve 103 and the suction port of the compressor 101.

[0114] Among them, the air-conditioning system also includes a pressurization branch 4, the second end of the first liquid discharge branch 2 is connected to the pipeline between the four-way reversing valve 103 and the evaporator, the second end of the pressurization branch 4 is connected to the pipeline between the exhaust port of the compressor 101 and the four-way reversing valve 103, and the second end of the pressure relief branch 3 is connected between the inlet of the gas-liquid separator 109 and the four-way reversing valve 103.

[0115] In this embodiment, the second end of the first drain branch 2 is connected to the pipeline between the four-way reversing valve 103 and the evaporator. When draining in cooling mode, the refrigerant discharged from the first drain branch 2 can flow to the four-way reversing valve 103 together with the refrigerant flowing out of the evaporator, and then enter the gas-liquid separator 109 for separation and then replenish the gaseous refrigerant to the compressor; when draining in heating mode, the refrigerant flowing out of the compressor 101 through the four-way reversing valve 103 is combined with the refrigerant discharged from the first drain branch 2 and can enter the condenser for heat exchange, thereby achieving a larger heat exchange capacity.

[0116] The second end of the pressurizing branch 4 is connected to the pipeline between the exhaust port of the compressor 101 and the four-way reversing valve 103. The larger pressure at the exhaust port of the compressor 101 can be used to pressurize the liquid storage container 110 so that the refrigerant in the liquid storage container 110 can be discharged smoothly.

[0117] The second end of the pressure relief branch 3 is connected between the inlet of the gas-liquid separator 109 and the four-way reversing valve 103. When the pressure in the liquid storage container 110 is too high to continue collecting liquid, the gaseous refrigerant discharged through the pressure relief branch 3 can first enter the gas-liquid separator 109 for gas-liquid separation, and then allow the gas to enter the compressor 101 to prevent liquid hammer caused by the compressor 101 sucking in liquid.

[0118] In some embodiments, as Figure 1 As shown, the liquid inlet A and the pressure regulating port C are arranged in the upper area of ​​the liquid storage container 110, and the liquid outlet B is arranged in the lower area of ​​the liquid storage container 110.

[0119] The liquid storage container 110 includes a top wall, a bottom wall and side walls, and can be, for example, cylindrical or prismatic. The "upper area" includes the area above the top wall and the side walls, and the "lower area" includes the area below the bottom wall and the side walls. For example, the liquid inlet A can be provided on the top wall. After the refrigerant is introduced through the liquid inlet pipeline, it can fall directly from above into the bottom of the liquid storage container 110, and gas-liquid separation is not likely to occur; the liquid outlet B can be provided in the bottom area of ​​the side wall. When the amount of stored liquid is small, the refrigerant inside the liquid storage container 110 can also be discharged smoothly; the pressure regulating port C is provided in the area above the side wall, which is convenient for pressure regulation by discharging gaseous refrigerant or introducing high-pressure gaseous refrigerant. Optionally, the liquid inlet A can also be provided in the lower area.

[0120] In this embodiment, the liquid inlet A can be arranged in the upper area of ​​the liquid storage container 110. After the refrigerant is introduced through the liquid inlet pipeline, it can fall directly into the bottom of the liquid storage container 110 from above with less resistance, and the liquid can be collected smoothly; the pressure regulating port C is arranged in the upper area of ​​the liquid storage container 110, which is convenient for adjusting the pressure inside the liquid storage container 110 by discharging the gaseous refrigerant or introducing the high-pressure gaseous refrigerant; the liquid outlet B is arranged in the lower area of ​​the liquid storage container 110, and when the storage amount of liquid is small, the refrigerant inside the liquid storage container 110 can also be discharged smoothly.

[0121] In some embodiments, as Figure 17 As shown, the liquid inlet pipeline includes a second liquid inlet branch 5, the second end of the second liquid inlet branch 5 is connected to the low-pressure side pipeline, and the liquid inlet valve further includes a second liquid inlet valve 119 provided on the second liquid inlet branch 5; and / or

[0122] The liquid discharge pipeline includes a second liquid discharge branch 6 , a second end of the second liquid discharge branch 6 is connected to the medium-pressure side pipeline, and the liquid discharge valve further includes a second liquid discharge valve 117 provided on the second liquid discharge branch 6 .

[0123] In this embodiment, optionally, only the second liquid inlet branch 5 may be provided in the air-conditioning system, or both the first liquid inlet branch 1 and the second liquid inlet branch 5 may be provided.

[0124] This embodiment Figure 1 On the basis of the above, a second liquid inlet branch 5 and a second liquid discharge branch 6 are added. In addition to the air-conditioning system being able to collect liquid from the medium-pressure side pipeline, discharge liquid to the low-pressure side in cooling mode, and discharge liquid to the high-pressure side pipeline in heating mode in cooling and heating mode, it is also possible to collect liquid from the low-pressure side in cooling and heating mode, and discharge liquid to the medium-pressure side pipeline in cooling and heating mode. This expands the liquid collection and discharge modes of the air-conditioning system, making it possible to collect liquid from different pressure areas or discharge the refrigerant in the liquid storage container 110 to different pressure areas of the system. The appropriate liquid collection or discharge mode can be flexibly selected according to the actual heat exchange requirements of the air-conditioning system to achieve the best heat exchange effect.

[0125] In some embodiments, as Figure 17 As shown, the refrigerant circulation loop also includes a four-way reversing valve 103 and a gas-liquid separator 109. The four-way reversing valve 103 is used to reverse when switching between the cooling mode and the heating mode. The gas-liquid separator 109 is arranged on the pipeline between the four-way reversing valve 103 and the air intake of the compressor 101; the second end of the second liquid inlet branch 5 is connected between the four-way reversing valve 103 and the inlet of the gas-liquid separator 109.

[0126] In this embodiment, a low-pressure side pipeline is provided between the four-way reversing valve 103 and the inlet of the gas-liquid separator 109. Thus, the second end of the second liquid inlet branch 5 can be connected to the low-pressure side pipeline to collect liquid from the low-pressure side in cooling or heating mode. Moreover, the second end of the second liquid inlet branch 5 is connected to a position before the inlet of the gas-liquid separator 109. This pipeline section contains more liquid refrigerant, which is convenient for liquid collection.

[0127] In some embodiments, as Figure 21 and Figure 22 As shown, a main pipe section a is formed between the four-way reversing valve 103 and the second end of the second liquid inlet branch 5, and a branch pipe section b is formed between the second end of the second liquid inlet branch 5 and the inlet of the gas-liquid separator 109. The main pipe section a is connected to the second liquid inlet branch 5 and the branch pipe section b. The second liquid inlet branch 5 is Figure 22 The branch pipe section c in the pipeline.

[0128] The refrigerant flow resistance of the branch pipe section b is greater than the refrigerant flow resistance of the second liquid inlet branch 5 .

[0129] This embodiment takes into account that when collecting liquid from the low-pressure side pipeline, the pressure difference between the low-pressure side pipeline and the liquid storage container 110 is small. By making the refrigerant flow resistance of the branch pipeline section b greater than the refrigerant flow resistance of the second liquid inlet branch 5, the refrigerant in the main pipeline section a can flow preferentially to the second liquid inlet branch 5 for liquid collection, so as to smoothly realize low-pressure side liquid collection.

[0130] In some embodiments, as Figures 22 to 24 , the height of the second liquid inlet branch 5 is lower than the length section of the branch pipe section b close to the second end of the second liquid inlet branch 5; and / or

[0131] The branch pipe section b is provided with a resistance increasing portion 10 , and the resistance increasing portion 10 is configured to increase the refrigerant flow resistance of the branch pipe section b.

[0132] Among them, such as Figure 22 As shown, the main pipeline section a and the branch pipeline section b are arranged horizontally and flush, and the branch pipeline section c bends downward to form an L-shaped pipeline. The horizontal section of the L-shaped pipeline is lower than the branch pipeline section b. By setting the height difference, the refrigerant preferentially flows into the lower second liquid inlet branch 5.

[0133] like Figure 24 As shown, the main pipeline section a bends upward to form an L-shaped pipeline, and the second liquid inlet branch 5 bends downward to form an L-shaped pipeline. The horizontal section of the main pipeline section a is higher than the horizontal section of the second liquid inlet branch 5, and the refrigerant preferentially flows into the lower second liquid inlet branch 5.

[0134] like Figure 23As shown, a resistance increasing portion 10 is provided on the branch pipe section b. For example, the resistance increasing portion 10 is a throttle or a curved pipe, which can increase the flow resistance of the refrigerant in the branch pipe section b, so that the refrigerant flows preferentially into the lower second liquid inlet branch 5.

[0135] The pipeline in this embodiment can utilize various structural forms to increase the refrigerant flow resistance of branch pipeline section b to be greater than that of the second liquid inlet branch 5. This allows the refrigerant in main pipeline section a to flow preferentially to the second liquid inlet branch 5 for collection, thereby smoothly achieving low-pressure side collection. This resistance relationship is achieved through the height difference of the pipeline, requiring only specific pipeline locations during system layout. The provision of the resistance-increasing portion 10 allows resistance adjustment by modifying the local pipeline structure.

[0136] In some embodiments, as Figures 32 to 37 As shown, the liquid inlet pipeline includes a second liquid inlet branch 5 and a pressurizing branch 4. The second end of the second liquid inlet branch 5 is connected to the low-pressure side pipeline, and the liquid inlet valve includes a second liquid inlet valve 119 provided on the second liquid inlet branch 5; the pressurizing branch 4 is provided with a pressurizing valve 111 with an on state and an off state. The first end of the pressurizing branch 4 is connected to the pressure regulating port C of the liquid storage container 110. For example, the second end of the pressurizing branch 4 is connected to the high-pressure side pipeline, or can also be connected to the medium-pressure side pipeline or other position, as long as the pressure at the connected position is greater than the pressure inside the liquid storage container 110.

[0137] The drain pipeline includes a first drain branch 2 and / or a second drain branch 6. The second end of the first drain branch 2 is configured to communicate with the low-pressure side pipeline in cooling mode and with the high-pressure side pipeline in heating mode. The second end of the second drain branch 6 is connected to the medium-pressure side pipeline. The drain valve includes a first drain valve 115 provided on the first drain branch 2 and a second drain valve 117 provided on the second drain branch 6.

[0138] The refrigerant circulation loop is provided with a second control valve 121 on the pipeline section between the second end of the second liquid inlet branch 5 and the air intake of the compressor 101; the liquid storage container 110 has an air outlet D, and the air-conditioning system also includes a first control valve 120, the first end of the first control valve 120 is connected to the air outlet D, and the second end of the first control valve 120 is connected to the pipeline section between the second control valve 121 and the air intake of the compressor 101.

[0139] The first control valve 120 and the second control valve 121 both have an on state and an off state.

[0140] Optionally, a first liquid inlet branch 1 and a second liquid inlet branch 5 are simultaneously provided in the air-conditioning system. The first liquid inlet branch 1 and the second liquid inlet branch 5 can select one of the branches to realize liquid inlet according to actual needs, or liquid can be inletted through both branches at the same time. At the same time, a first liquid discharge branch 2 or a second liquid discharge branch 6 is provided in the air-conditioning system, thereby having two liquid inlet branches and one liquid discharge branch.

[0141] This embodiment has a low-pressure side liquid collection mode for cooling and heating, a medium-pressure side liquid discharge mode for cooling and a high-pressure side liquid discharge mode for heating. On the basis of realizing the liquid collection and discharge functions, the gas-liquid separator can be omitted, the system structure can be simplified, and the cost can be reduced. The risk of liquid inhalation in the compressor 101 can be prevented by precise control of multiple valves.

[0142] Secondly, the present disclosure provides a control method for an air conditioning system based on the above embodiment, which, in some embodiments, includes:

[0143] Liquid collection mode: the liquid inlet valve is turned on, and the pressure at the first end of the liquid inlet pipeline is lower than the pressure at the second end, so that the refrigerant in the refrigerant circulation loop is stored in the liquid storage container 110;

[0144] Discharge mode: When the refrigerant in the liquid storage container 110 needs to be discharged to the refrigerant circulation circuit, the discharge valve is turned on and the pressure at the first end of the discharge pipeline is made greater than the pressure at the second end.

[0145] During load or mode switching, the number of indoor units in a multi-split system changes. Due to the significant change in the air conditioner's operating state, the refrigerant in the refrigerant circulation loop can be adjusted to meet operational demands through the use of liquid collection and drainage modes. When the air conditioner system switches from defrost mode to heating mode for a period of time, accelerated drainage is necessary to facilitate the rapid entry of liquid refrigerant into the system and its circulation.

[0146] The air-conditioning system control method of this embodiment can be connected to at least one of the low-pressure side pipeline, medium-pressure side pipeline and high-pressure side pipeline in the system through an inlet valve and a drain valve with on-off functions. On the basis of realizing the conventional refrigerant mode and the heating mode, the excess refrigerant in the refrigerant circulation loop can be collected from a specific pressure side by using the pressure difference according to the actual heat exchange demand of the air-conditioning system, or the refrigerant in the liquid storage container 110 can be discharged into the refrigerant circulation loop for replenishment according to the actual refrigerant demand, so as to achieve the best heat exchange effect and improve the heat exchange efficiency of the system.

[0147] In some embodiments, for example Figures 1 to 9 The first embodiment shown, and Figures 10 to 16In the second embodiment shown, the air conditioning system further includes a pressure relief branch 3 and a pressurization branch 4. The pressure relief branch 3 is provided with a balancing valve 112. The first end of the pressure relief branch 3 is connected to the pressure regulating port C of the liquid storage container 110, and the second end of the pressure relief branch 3 can be connected to the low-pressure side pipeline or the medium-pressure side pipeline; the pressurization branch 4 is provided with a pressurization valve 111. The first end of the pressurization branch 4 is connected to the pressure regulating port C, and the second end of the pressurization branch 4 is connected to the high-pressure side pipeline.

[0148] The liquid inlet pipeline includes a first liquid inlet branch 1, the second end of the first liquid inlet branch 1 is connected to the medium pressure side pipeline, and the liquid inlet valve includes a first liquid inlet valve 113 provided on the first liquid inlet branch 1;

[0149] The liquid collection mode includes: a cooling liquid collection mode and a heating liquid collection mode. In the cooling liquid collection mode and the heating liquid collection mode, the drain valve and the pressurizing valve 111 are both in the disconnected state, the first liquid inlet valve 113 is in the connected state, and when the pressure difference across the first liquid inlet valve 113 is less than a preset threshold, the balancing valve 112 is in the connected state to release the pressure in the liquid storage container 110.

[0150] in, Figure 3 This is a schematic diagram of the cooling liquid collection mode. First liquid inlet valve 113 is in the open state. A portion of the liquid refrigerant flowing out of outdoor heat exchanger 104 enters liquid storage container 110 through first liquid inlet valve 113, completing liquid collection in cooling mode. Simultaneously, when pressure P0 within liquid storage container 110 is high, resulting in a small pressure differential across first liquid inlet valve 113, balancing valve 112 is in the open state. The second end of balancing valve 112 is connected to the low-pressure side pipeline, relieving pressure within liquid storage container 110 and ensuring smooth liquid collection.

[0151] Figure 6 This is a schematic diagram of the heating liquid collection mode. First liquid inlet valve 113 is in the open state. A portion of the liquid refrigerant flowing out of the indoor heat exchanger 122 enters the liquid storage container 110 through first liquid inlet valve 113, completing the liquid collection process in heating mode. Simultaneously, when the pressure P0 within the liquid storage container 110 is high, resulting in a low pressure differential across first liquid inlet valve 113, balancing valve 112 is in the open state. The second end of balancing valve 112 is connected to the low-pressure side pipeline, relieving pressure within the liquid storage container 110 and ensuring a smooth liquid collection process.

[0152] When collecting liquid in the cooling mode or the heating mode, this embodiment puts the first liquid inlet valve 113 in the on state, so that the refrigerant in the medium-pressure side pipeline can enter the liquid storage container 110 to collect liquid. In addition, when the pressure in the liquid storage container 110 is too high to collect liquid normally, by putting the balancing valve 112 in the on state, the pressure in the liquid storage container 110 can be discharged to the low-pressure side pipeline through the pressure relief branch 3, ensuring that a pressure difference is established at both ends of the first liquid inlet valve 113, which is conducive to further smooth liquid collection and efficient storage of the refrigerant.

[0153] In some embodiments, for example Figures 10 to 16 In the second embodiment shown, the drain pipeline includes a first drain branch 2, the second end of the first drain branch 2 is configured to communicate with the low-pressure side pipeline in the cooling mode and communicate with the high-pressure side pipeline in the heating mode, and the drain valve includes a first drain valve 115 provided on the first drain branch 2; the drain mode also includes a cooling drain mode and a heating drain mode.

[0154] like Figure 13 As shown, in the refrigeration discharge mode, the first discharge valve 115 is in the on state, at which time the first inlet valve 113 and the balancing valve 112 are both in the off state, or the discharge through the first discharge valve 115 and the intake through the first inlet valve 113 can be carried out simultaneously;

[0155] like Figure 15 and Figure 16 In the heating and liquid discharge mode, the first liquid inlet valve 113 is first placed in the on state. When the pressure in the liquid storage container 110 reaches the pressure at the second end of the first liquid inlet branch 1, the first liquid inlet valve 113 is placed in the off state. Thereafter, the compressor 101 is reduced in frequency or stopped, and at this time, the first liquid discharge valve 115 is placed in the on state.

[0156] In heating and liquid discharge mode, the pressure at the compressor 101 outlet is labeled as first pressure point P1, the pressure downstream of the first liquid discharge valve 115 is labeled as second pressure point P2, and the pressure at the second end of the first liquid inlet branch 1 is labeled as third pressure point P3, i.e., the position between the external unit throttling element 105 and the liquid pipe valve 106. In heating mode, P1>P2>P3.

[0157] First, if Figure 15 As shown, after the first liquid inlet valve 113 is in the on state, the pressure in the liquid storage container 110 is adjusted to the medium pressure state, that is, the pressure P0 in the liquid storage container 110 = the third pressure point P3, and then the first liquid inlet valve 113 is switched to the off state. At this time, P1>P2>P3=P0, so that the pressure in the liquid storage container 110 can be maintained.

[0158] Afterwards, if Figure 16 As shown, the compressor 101 is reduced in frequency or stopped. At this time, the pressures of the first pressure point P1, the second pressure point P2 and the third pressure point P3 are reduced, which are recorded as P1', P2' and P3'. At this time, the pressure P0 in the liquid storage container 110 remains unchanged, P0>P1'>P2'>P3'. At this time, the first liquid discharge valve 115 is in the on state, and the refrigerant in the liquid storage container 110 can be discharged.

[0159] In cooling discharge mode, this embodiment discharges liquid to the low-pressure side pipeline. Therefore, the first discharge valve 115 alone can be used to discharge liquid, which can also achieve the discharge function and simplify the control method. In heating discharge mode, since liquid is discharged to the high-pressure side pipeline, the pressure in the liquid storage container 110 is first increased and maintained through the first liquid inlet valve 113. Since the second end of the first liquid inlet valve 113 is connected to the medium-pressure side pipeline, it is still difficult to discharge the refrigerant. By reducing the frequency or stopping the operation of the compressor 101, the pressure at the second end of the first discharge branch 2 can be reduced, thereby allowing the refrigerant in the liquid storage container 110 to be discharged smoothly.

[0160] In some embodiments, for example Figures 1 to 9 In the illustrated first embodiment, the liquid collection mode is consistent with that of the second embodiment. The air conditioning system further includes a pressurization branch 4, on which a pressurization valve 111 is provided. The first end of the pressurization branch 4 is connected to the pressure regulating port C. The liquid discharge pipeline includes a first liquid discharge branch 2, the second end of which is configured to communicate with the low-pressure side pipeline in cooling mode and with the high-pressure side pipeline in heating mode. The liquid discharge valve includes a first liquid discharge valve 115 provided on the first liquid discharge branch 2.

[0161] The drainage mode includes: a first cooling drainage mode, a second cooling drainage mode, a first heating drainage mode and a second heating drainage mode; wherein,

[0162] like Figure 4 As shown, in the first refrigeration discharge mode, the first discharge valve 115 is in the on state, and when the internal pressure P0 of the liquid storage container 110 drops to the same level as the low-pressure side pipeline, the pressurizing valve 111 is in the on state, and the first liquid inlet valve 113 and the balancing valve 112 are both in the off state;

[0163] like Figure 5 As shown, in the second refrigeration discharge mode, the balancing valve 112 is in the on state, and the first liquid inlet valve 113, the first liquid discharge valve 115 and the pressurizing valve 111 are all in the off state;

[0164] like Figure 7 As shown, in the first heating and draining mode, pressurizing valve 111 is opened to raise the pressure inside liquid storage container 110 to the pressure at the second end of pressurizing branch line 4, and first drain valve 115 is opened; first inlet valve 113 and balancing valve 112 are opened. Preferably, pressurizing valve 111 is opened first, and after the pressure inside liquid storage container 110 reaches the pressure at the second end of pressurizing branch line 4, first drain valve 115 is opened, making it easier to reach the required draining pressure. Alternatively, pressurizing valve 111 and first drain valve 115 can be opened simultaneously.

[0165] Specifically, the pressure at the exhaust port of the compressor 101 is marked as the first pressure point P1, and the pressure downstream of the first drain valve 115 is marked as the second pressure point P2. In the heating mode, P1>P2. In this state, the pressurizing valve 111 is opened, and the pressure P0 inside the liquid storage container 110 is P1>P2. Opening the first drain valve 115 can discharge the refrigerant in the liquid storage container 110.

[0166] like Figure 8 and Figure 9 As shown, in the second heating and liquid discharge mode, the pressurizing valve 111 is first placed in the on state. When the pressure inside the liquid storage container 110 rises to the pressure at the second end of the pressurizing branch 4, the pressurizing valve 111 is switched to the off state. Thereafter, the compressor 101 is reduced in frequency or stopped, and at this time, the first liquid discharge valve 115 is placed in the on state.

[0167] Specifically, first, Figure 8 As shown, after the pressurizing valve 111 is turned on, the pressure in the liquid storage container 110 is adjusted to a high pressure state. That is, the pressure P0 in the liquid storage container 110 is equal to the first pressure point P1, that is, P0 = P1; at the same time, P0> P2, that is, P0=P1>P2. Next, the pressurizing valve 111 and the first liquid discharge valve 115 are turned off to maintain the pressure in the liquid storage container 110.

[0168] Afterwards, if Figure 19 As shown, the compressor 101 is reduced in frequency or stopped. At this time, the pressures of the first pressure point P1 and the second pressure point P2 are reduced, which are recorded as P1' and P2'. At this time, the pressure P0 in the liquid storage container 110 remains unchanged, P0>P1'>P2'. At this time, the first liquid discharge valve 115 is in the on state, and the refrigerant in the liquid storage container 110 can be discharged.

[0169] The air conditioning system of this embodiment has two drainage modes in both cooling and heating modes, and can flexibly select different drainage modes according to needs to optimize the heat exchange effect. Specifically:

[0170] In the first refrigeration discharge mode, the second end of the first discharge branch 2 is connected to the low-pressure side pipeline. After the first discharge valve 115 is opened, the refrigerant can enter the system circulation. When the internal pressure of the liquid storage container 110 drops to a point where it cannot be discharged, the pressure inside the liquid storage container 110 is increased by opening the pressurizing valve 111 for a preset time, so that the refrigerant can continue to be discharged.

[0171] In the second refrigeration discharge mode, since the second end of the balancing valve 112 is connected to the low-pressure side pipeline, the balancing valve 112 is in the on state, and the refrigerant in the liquid storage container 110 can also be discharged into the system circulation. At this time, the refrigerant discharged is gaseous refrigerant, which is suitable for situations where less refrigerant needs to be added to the system.

[0172] In the first heating and drainage mode, since the second end of the first drainage branch 2 is connected to the high-pressure side pipeline, by turning on the pressurizing valve 111 during drainage, the high-pressure pipeline at the exhaust port of the compressor 101 can be used to pressurize the interior of the liquid storage container 110, thereby achieving smooth drainage in the heating mode.

[0173] In the second heating discharge mode, the pressure in the liquid storage container 110 is first increased and maintained through the pressure-boosting valve 111. Since the second end of the first discharge branch 2 is connected to the high-pressure side pipeline, it is difficult to discharge a large amount of refrigerant, and a large amount of refrigerant will remain in the liquid storage container 110. By reducing the frequency or stopping the compressor 101, the pressure at the second end of the first discharge branch 2 can be reduced, so that the refrigerant in the liquid storage container 110 can be discharged smoothly and the discharge volume of the refrigerant can be increased.

[0174] In some embodiments, as Figures 17 to 25 In the third embodiment shown, the liquid inlet pipeline includes a second liquid inlet branch 5, the second end of which is connected to the low-pressure side pipeline, and the liquid inlet valve further includes a second liquid inlet valve 119 provided on the second liquid inlet branch 5; the liquid discharge pipeline includes a second liquid discharge branch 6, the second end of which is connected to the medium-pressure side pipeline, and the liquid discharge valve further includes a second liquid discharge valve 117 provided on the second liquid discharge branch 6; a branch pipeline section b is formed between the second end of the second liquid inlet branch 5 and the inlet of the gas-liquid separator 109;

[0175] The liquid collection mode also includes: a cooling low-pressure side liquid collection mode and a heating low-pressure side liquid collection mode. In the cooling low-pressure side liquid collection mode and the heating low-pressure side liquid collection mode, the second liquid inlet valve 119 is in the on state, and when the pressure in the liquid storage container 110 increases to the point where the refrigerant flow resistance of the second liquid inlet branch 5 is greater than that of the branch pipe section b, the balancing valve 112 is opened; and / or

[0176] The discharge mode also includes: a refrigeration medium-pressure side discharge mode. In the refrigeration medium-pressure side discharge mode, the pressurizing valve 111 is first placed in the on state. When the pressure in the liquid storage container 110 rises to the pressure at the second end of the pressurizing branch 4, the pressurizing valve 111 is switched to the off state; then, the second discharge valve 117 is opened.

[0177] Specifically, if Figure 19 As shown, in the low-pressure side liquid collection mode, with second liquid inlet valve 119 in the open state, liquid refrigerant flows back from gas pipe valve 107 to the low-pressure side. Most of the refrigerant enters liquid storage container 110 through second liquid inlet branch 5, while a small amount flows through branch pipe section b, passes through gas-liquid separator 109, and returns to the low-pressure side pipeline. When the internal pressure P0 of liquid storage container 110 rises to a level greater than the flow resistance of branch pipe section c, further liquid collection becomes impossible. At this time, balancing valve 112 can be opened to reduce the flow resistance of branch pipe section b.

[0178] like Figure 21 As shown, in the heating low-pressure side liquid collection mode, the valve body action is Figure 19 The refrigeration low-pressure side liquid collection pattern is consistent.

[0179] like Figure 20 As shown, in the refrigeration medium-pressure side discharge mode, the pressurizing valve 111 is first placed in the on state. After the pressure P0 in the liquid storage container 110 rises to the equivalent of the first pressure point P1, the pressurizing valve 111 is switched to the off state; then the second discharge valve 117 is placed in the on state. At this time, the internal pressure P0 of the liquid storage container 110 is higher than the fourth pressure point P4. The fourth pressure point P4 is the pressure at the second end of the second discharge branch 6. The refrigerant in the liquid storage container 110 can be discharged through the second discharge valve 117 and enter the medium-pressure side pipeline of the system to participate in the circulation.

[0180] like Figure 25 As shown, in the heating high-pressure side discharge mode, the valve body switching mode is consistent with the first heating discharge mode in the first embodiment. In addition, the second heating discharge mode in the first embodiment can also be realized.

[0181] This embodiment adds a second liquid inlet branch 5 and a second liquid discharge branch 6 to the first embodiment. While the air conditioning system can collect liquid from the medium-pressure side pipeline, discharge it to the low-pressure side in cooling mode, and discharge it to the high-pressure side in heating mode in cooling and heating modes, it can also collect liquid from the low-pressure side in cooling and heating modes, and discharge it to the medium-pressure side in cooling and heating modes. This expands the liquid collection and discharge modes of the air conditioning system, allowing liquid collection from different pressure areas or discharge of refrigerant from the liquid storage container 110 to different pressure areas of the system. The appropriate liquid collection or discharge mode can be flexibly selected based on the actual heat exchange requirements of the air conditioning system to achieve the best heat exchange effect.

[0182] In some embodiments, as Figures 26 to 31 In the fourth embodiment shown, the first liquid inlet valve 113 is eliminated compared with the third embodiment. The control method of the fourth embodiment in the cooling low-pressure side liquid collection mode, the heating low-pressure side liquid collection mode, the cooling medium-pressure side liquid discharge mode and the heating high-pressure side liquid discharge mode is consistent with that of the third embodiment.

[0183] In some embodiments, as Figures 32 to 37 As shown, the liquid inlet pipeline includes a second liquid inlet branch 5 and a pressurizing branch 4. The second end of the second liquid inlet branch 5 is connected to the low-pressure side pipeline, and the liquid inlet valve includes a second liquid inlet valve 119 provided on the second liquid inlet branch 5; the pressurizing branch 4 is provided with a pressurizing valve 111, the first end of the pressurizing branch 4 is connected to the pressure regulating port C of the liquid storage container 110, and the second end of the pressurizing branch 4 is connected to the high-pressure side pipeline;

[0184] The drain pipeline includes a first drain branch 2 and a second drain branch 6. The second end of the first drain branch 2 is configured to communicate with the low-pressure side pipeline in cooling mode and with the high-pressure side pipeline in heating mode. The second end of the second drain branch 6 is connected to the medium-pressure side pipeline. The drain valve includes a first drain valve 115 provided on the first drain branch 2 and a second drain valve 117 provided on the second drain branch 6.

[0185] A second control valve 121 is provided on the pipe section between the second end of the second liquid inlet branch 5 and the air intake of the compressor 101 in the refrigerant circulation circuit; the liquid storage container 110 has an exhaust port, and the air conditioning system further includes a first control valve 120, a first end of the first control valve 120 being connected to the exhaust port, and a second end of the first control valve 120 being connected to the pipe section between the second control valve 121 and the air intake of the compressor 101;

[0186] The liquid collection mode includes the cooling low-pressure side liquid collection mode and the heating low-pressure side liquid collection mode, such as Figure 34 and Figure 36 As shown, in the cooling low-pressure side liquid collection mode and the heating low-pressure side liquid collection mode, the second liquid inlet valve 119 and the first control valve 120 are in the connected state, and the other valves are in the disconnected state.

[0187] In this embodiment, in the refrigeration low-pressure side liquid collection mode, the high-pressure gaseous refrigerant discharged from the compressor 101 passes through the four-way reversing valve 103, the outdoor heat exchanger 104, the outdoor unit throttling element 105, the indoor heat exchanger 122, the four-way reversing valve 103, and the second liquid inlet valve 119 in sequence and then enters the liquid storage container 110. Subsequently, the gaseous refrigerant is discharged back to the compressor 101 through the first control valve 120. In this process, the liquid storage container 110 becomes part of the main circulation loop. Since the refrigerant discharged through the first control valve 120 is gaseous, the discharge speed is slow, so it is suitable for occasions with smaller heat exchange requirements.

[0188] In the heating low-pressure side liquid collection mode, the high-pressure gaseous refrigerant discharged from the compressor 101 passes through the four-way reversing valve 103, the indoor heat exchanger 122, the outdoor unit throttling element 105, the outdoor heat exchanger 104, the four-way reversing valve 103, and the second liquid inlet valve 119 in sequence and then enters the liquid storage container 110. Subsequently, the gaseous refrigerant is discharged back to the compressor 101 through the first control valve 120. In this process, the liquid storage container 110 becomes part of the main circulation loop. Since the refrigerant discharged through the first control valve 120 is gaseous and has a slow discharge speed, it is suitable for occasions with smaller heat exchange requirements.

[0189] This embodiment can eliminate the need for a gas-liquid separator, simplify the system structure, reduce costs, and prevent the compressor 101 from having the risk of inhaling liquid through precise control of multiple valves.

[0190] In some embodiments, the liquid discharge mode includes a cooling medium-pressure side liquid discharge mode and a heating high-pressure side liquid discharge mode.

[0191] like Figure 35 As shown, in the refrigeration medium-pressure side liquid discharge mode, the first control valve 120 is in the off state, and the second control valve 121 is in the on state. Then, the pressurizing valve 111 is in the on state to increase the pressure in the liquid storage container 110, and the second liquid discharge valve 117 is in the on state.

[0192] Preferably, the pressurizing valve 111 is first turned on. When the pressure in the liquid storage container 110 reaches the pressure at the second end of the pressurizing branch 4, the pressurizing valve 111 is switched off, and then the second liquid discharge valve 117 is opened. This method makes it easier to achieve pressurization and ensures a smooth liquid discharge process. Optionally, the pressurizing valve 111 and the second liquid discharge valve 117 can also be opened simultaneously.

[0193] like Figure 37 As shown, in the heating high-pressure side liquid discharge mode, the first control valve 120 is in the disconnected state, and the second control valve 121 is in the connected state. Then, the pressurizing valve 111 is in the connected state to increase the pressure inside the liquid storage container 110, and the first liquid discharge valve 115 is in the connected state.

[0194] Preferably, the pressurizing valve 111 is first opened. When the pressure inside the liquid storage container 110 rises to the pressure at the second end of the pressurizing branch 4, the pressurizing valve 111 is switched to the open state, and then the first liquid discharge valve 115 is opened. This method makes it easier to achieve pressurization and ensures a smooth liquid discharge process. Optionally, the pressurizing valve 111 and the first liquid discharge valve 115 can be opened simultaneously.

[0195] In this embodiment, in the cooling medium-pressure side liquid discharge mode, the second control valve 121 is in the on state, connecting to the low-pressure side pipeline. Since the second end of the second liquid discharge branch 6 is connected to the medium-pressure side pipeline, the pressure in the liquid storage container needs to be increased by the pressurizing valve 111 to facilitate smooth liquid discharge. In the heating high-pressure side liquid discharge mode, since the second end of the first liquid discharge branch 2 is connected to the high-pressure side pipeline, the pressure in the liquid storage container needs to be increased by the pressurizing valve 111 to facilitate smooth liquid discharge.

[0196] The five embodiments shown in the accompanying drawings are described in detail below. The valves in each embodiment may be solenoid valves, and may be controlled by a controller.

[0197] 1. First embodiment, as Figures 1 to 9 shown.

[0198] The air conditioning system includes a compressor 101, an outdoor heat exchanger 104, an indoor heat exchanger 122, a first liquid inlet valve 113, a liquid storage container 110, a gas-liquid separator 109, a four-way reversing valve 103, a first liquid discharge valve 115, a pressurizing valve 111, and a balancing valve 112. A liquid pipe valve 106 and a gas pipe valve 107 are respectively provided at the two refrigerant interfaces of the indoor heat exchanger 122. The liquid pipe valve 106 is provided on the pipeline between the indoor heat exchanger 122 and the outdoor heat exchanger 104, and the gas pipe valve 107 is provided on the pipeline connecting the four-way reversing valve 103. Furthermore, a first pressure sensor 102 is provided between the compressor 101 and the four-way reversing valve 103 for detecting the refrigerant pressure at a first pressure point P1. A second pressure sensor 108 is provided between the gas-liquid separator 109 and the four-way reversing valve 103 for detecting the pressure at the inlet of the gas-liquid separator 109. The air-conditioning system also includes a unloading valve 114, the first end of the unloading valve 114 is connected to the first liquid inlet branch 1 between the first liquid inlet valve 113 and the liquid inlet A, and the second end of the unloading valve 114 is connected to the inlet of the gas-liquid separator 109 and the pipeline between the four-way reversing valve 103, and is used to relieve pressure when the pressure in the first liquid inlet branch 1 exceeds the safety threshold.

[0199] The air conditioning system of the first embodiment has a conventional cooling mode, such as Figure 1 As shown, the first liquid inlet valve 113, the first liquid outlet valve 115, the pressurizing valve 111 and the balancing valve 112 are all in the disconnected state; and the conventional heating mode, such as Figure 2 As shown, the first liquid inlet valve 113, the first liquid outlet valve 115, the pressurizing valve 111 and the balancing valve 112 are all in the disconnected state.

[0200] In addition, the air conditioning system also has the following liquid collection mode and liquid discharge mode:

[0201] A. Refrigeration and liquid collection mode: Figure 3 As shown, the first liquid inlet valve 113 is in the on state, while the pressurizing valve 111, the balancing valve 112, and the first liquid discharge valve 115 are closed. The second end of the first liquid inlet valve 113 is connected to the medium-pressure side of the system. When this valve is in the on state, a portion of the refrigerant flowing out of the outdoor heat exchanger 104 is stored in the liquid storage container 110 through the first liquid inlet valve 113, completing the liquid collection in the cooling mode. At the same time, when the internal pressure P0 is high and the pressure differential across the first liquid inlet valve 113 is small, the balancing valve 112 is in the on state, and the second end of the balancing valve 112 is connected to the low-pressure side of the system, allowing the internal pressure of the liquid storage container 110 to be relieved.

[0202] B. First refrigeration discharge mode: Figure 4As shown, pressurizing valve 111 and first drain valve 115 are in the open state, while first inlet valve 113 and balancing valve 112 are in the open state. The second end of first drain valve 115 connects to the low-pressure side of the system. When this valve is in the open state, refrigerant in liquid storage container 110 is discharged and recirculated through first drain valve 115. When the pressure P0 inside liquid storage container 110 drops to the same level as the low pressure and cannot be discharged further, pressurizing valve 111 is opened for a preset time to increase the pressure P0 inside liquid storage container 110.

[0203] C. Second refrigeration discharge mode: Figure 5 As shown, balancing valve 112 is in the on state, while pressurizing valve 111, first liquid inlet valve 113, and first liquid outlet valve 115 are in the off state. The second end of balancing valve 112 is connected to the low-pressure side of the system. When this valve is in the on state, the refrigerant in liquid storage container 110 is discharged and enters the system circulation through balancing valve 112.

[0204] D. Heating and liquid collection mode: Figure 6 As shown, the same as the cooling liquid collection mode.

[0205] For ease of understanding, two pressure points are introduced. The first pressure point is located after the compressor 101 and before the four-way reversing valve 103, where the pressure is recorded as P1; the second pressure point is located after the four-way reversing valve 103 and before the tracheal valve 107, where the pressure is recorded as P2.

[0206] E. First heating and liquid discharge mode: Figure 7 As shown, the pressurizing valve 111 and the first liquid discharge valve 115 are in the connected state, while the first liquid inlet valve 113 and the balancing valve 112 are in the disconnected state. At this point, the second end of the pressurizing valve 111 is connected to the first pressure point P1; the second end of the first liquid discharge valve 115 is connected to the second pressure point P2, where P1>P2. In this mode, when the pressurizing valve 111 is connected, the internal pressure of the liquid storage container 110, P0=P1>P2, and when the first liquid discharge valve 115 is connected, the refrigerant in the liquid storage container 110 can be discharged.

[0207] F. Second heating and draining mode:

[0208] ① First, if Figure 8 As shown, the liquid storage container 110 is first adjusted to a high pressure state by opening the pressurizing valve 111, and then the pressurizing valve 111 is closed. At this point, the internal pressure P0 of the liquid storage container 110 is equal to the first pressure point P1, i.e., P0 = P1. At the same time, P0 is higher than the second high pressure P2 of the system at the first end of the first liquid discharge valve 115, i.e., P0 > P2. P0 = P1 > P2.

[0209] ②Afterwards, if Figure 9As shown, the compressor 101 is reduced in frequency or stopped. The pressures at the first and second pressure points decrease, denoted as P1' and P2'. The pressure P0 inside the liquid storage container 110 remains unchanged, with P0 > P1' > P2'. The first drain valve 115 is now open, allowing the refrigerant inside to be discharged.

[0210] In different operating modes, the valve bodies connected to the liquid storage container 110 operate as follows:

[0211] Table 1 Valve body movements in various working modes of the first embodiment

[0212]

[0213] Second, the second embodiment, as Figures 10 to 16 shown.

[0214] On the basis of the first embodiment, the pressurizing valve 111 and the pressurizing branch 4 are eliminated, and the remaining components, the liquid storage container 110 , and the valve body connection features remain the same.

[0215] The air conditioning system of the second embodiment has a conventional cooling mode, such as Figure 10 As shown, the first liquid inlet valve 113, the first liquid outlet valve 115 and the balancing valve 112 are all in the disconnected state; and the conventional heating mode, such as Figure 11 As shown, the first liquid inlet valve 113, the first liquid outlet valve 115 and the balance valve 112 are all in the disconnected state.

[0216] In addition, the air conditioning system also has the following liquid collection mode and liquid discharge mode:

[0217] A. Refrigeration and liquid collection mode: Figure 12 As shown, it is consistent with the cooling and liquid collecting mode of the first embodiment.

[0218] B. Refrigeration discharge mode: Figure 13 As shown, the first drain valve 115 is in the on state, and the first inlet valve 113 and the balancing valve 112 are in the off state. The second end of the first drain valve 115 is connected to the low-pressure side of the system. When this valve is in the on state, the refrigerant in the liquid storage container 110 is discharged and enters the system circulation through the first drain valve 115.

[0219] C. Heating and liquid collection mode: Figure 14 As shown, it is consistent with the heating liquid collection mode of embodiment 1.

[0220] For ease of understanding, a third pressure point is introduced. This point is located after the heating air pipe valve 107 and before the heating unit's throttle element 105. The pressure here is labeled P3. In heating mode, P1 > P2 > P3.

[0221] D. Heating and draining mode:

[0222] ① First, if Figure 15 As shown, by turning on the first liquid inlet valve 113, the liquid storage container 110 is adjusted to a medium pressure state, that is, the internal pressure P0 of the liquid storage container 110 equals the third pressure point P3, and then the first liquid inlet valve 113 is turned off. At this time, P1>P2>P3=P0.

[0223] ②Afterwards, if Figure 16 As shown, compressor 101 is reduced in frequency or stopped. The pressures at the first, second, and third pressure points decrease, denoted as P1', P2', and P3'. The pressure P0 inside the liquid storage container remains unchanged, with the formula P0 > P1' > P2' > P3'. At this point, first drain valve 115 is closed to discharge the refrigerant from liquid storage container 110.

[0224] In different operating modes, the valve bodies connected to the liquid storage container 110 operate as follows:

[0225] Table 2 Valve body movements in various working modes of the second embodiment

[0226]

[0227]

[0228] 3. The third embodiment, as Figures 17 to 25 shown.

[0229] On the basis of the first embodiment, a second liquid inlet valve 119 and a second liquid outlet valve 117 connected to the low-pressure side pipeline are added. In addition to retaining the first embodiment's liquid collection of cooling / heat from the medium-pressure side, liquid discharge of cooling to the low-pressure side, and liquid discharge of heating to the high-pressure side, it is also possible to realize liquid collection of cooling / heat from the low-pressure side and liquid discharge of cooling to the medium-pressure side.

[0230] The second end connected to the second liquid inlet valve 119 is located after the four-way reversing valve 103 in the cooling direction and before the gas-liquid separator 109. The first end is a connecting pipe connected to the liquid storage container 110. The second end connected to the second liquid outlet valve 117 is located after the first end of the second liquid inlet valve 119 in the cooling direction and before the gas-liquid separator 109. The first end is a connecting pipe connected to the liquid storage container 110.

[0231] For ease of understanding, a concept of a pressure point is introduced: the fourth pressure point is located at the second end of the second liquid discharge valve 117, and the pressure here is recorded as P4.

[0232] The air conditioning system of the second embodiment has a conventional cooling mode, such as Figure 17 As shown, the first liquid inlet valve 113, the first liquid outlet valve 115, the balancing valve 112, the second liquid inlet valve 119 and the second liquid outlet valve 117 are all in the disconnected state; and the conventional heating mode, such as Figure 18 As shown, the first liquid inlet valve 113, the first liquid outlet valve 115, the balancing valve 112, the second liquid inlet valve 119 and the second liquid outlet valve 117 are all in the disconnected state.

[0233] In addition, the air conditioning system also has the following liquid collection mode and liquid discharge mode:

[0234] A. Refrigeration low-pressure side liquid collection mode: Figure 19 As shown, second liquid inlet valve 119 is in the on state, while pressurizing valve 111, balancing valve 112, first liquid inlet valve 113, first liquid drain valve 115, and second liquid drain valve 117 are in the off state. With second liquid inlet valve 119 in the on state, the majority of the liquid refrigerant flowing back to the low-pressure side from gas pipe valve 107 enters liquid storage container 110 through second liquid inlet branch 5, while a smaller portion flows through branch pipe section b and through gas-liquid separator 109 back to the low-pressure side. When the pressure inside liquid storage container 110 rises to the point where the flow resistance of second liquid inlet branch 5 exceeds the flow resistance of main pipe section a, and liquid storage container 110 can no longer collect liquid, balancing valve 112 can be opened to reduce the flow resistance of second liquid inlet branch 5.

[0235] B. Refrigeration medium pressure side discharge mode: Figure 20 As shown, the balancing valve 112, the first liquid inlet valve 113, the first liquid discharge valve 115, and the second liquid inlet valve 119 are in the off state. The pressurizing valve 111 is first connected. After the pressure P0 inside the liquid storage container 110 increases to the same level as the first pressure point P1, the pressurizing valve 111 is disconnected. The second liquid discharge valve 117 is then connected. At this point, the pressure P0 inside the liquid storage container 110 is higher than the fourth pressure point P4. The refrigerant inside the liquid storage container 110 can be discharged through the second liquid discharge valve 117 and enter the medium-pressure side of the system for circulation.

[0236] C. Heating low-pressure side liquid collection mode: Figure 21 As shown, the valve body action is consistent with the refrigeration low-pressure side liquid collection mode of the third embodiment.

[0237] D. Heating high pressure side discharge mode: Figure 25 As shown, the valve body action is consistent with the first heating liquid discharge and liquid collection mode of the first embodiment.

[0238] In different operating modes, the valve bodies connected to the liquid storage container 110 operate as follows:

[0239] Table 3 Valve body movements in various working modes of the third embodiment

[0240]

[0241] 4. The fourth embodiment, as Figures 26 to 31 As shown.

[0242] On the basis of the third embodiment, the first liquid inlet valve 113 is removed, and the rest remains unchanged. The functions are only retained to collect liquid from the low-pressure side for cooling / heating, discharge liquid to the medium-pressure side for cooling, and discharge liquid to the high-pressure side for heating.

[0243] The air conditioning system of the fourth embodiment has a conventional cooling mode, such as Figure 26 As shown, the first liquid inlet valve 113, the first liquid outlet valve 115 and the balancing valve 112 are all in the disconnected state; and the conventional heating mode, such as Figure 27 As shown, the first liquid inlet valve 113, the first liquid outlet valve 115 and the balance valve 112 are all in the disconnected state.

[0244] In addition, the air conditioning system also has the following liquid collection mode and liquid discharge mode:

[0245] A. Refrigeration low-pressure side liquid collection mode: Figure 28 As shown, the valve body action is consistent with the refrigeration low-pressure side liquid collection mode of the third embodiment.

[0246] B. Refrigeration medium pressure side discharge mode: Figure 29 As shown, the valve body action is consistent with the refrigeration medium-pressure side liquid discharge mode of the third embodiment.

[0247] C. Heating low-pressure side liquid collection mode: Figure 30 As shown, the valve body action is consistent with the heating low-pressure side liquid collection mode of the third embodiment.

[0248] D. Heating high pressure side discharge mode: Figure 31 As shown, the valve body action is consistent with the heating high-pressure side liquid discharge mode of the third embodiment.

[0249] In different operating modes, the valve bodies connected to the liquid storage container 110 operate as follows:

[0250] Table 4 Valve body movements in each working mode of the fourth embodiment

[0251]

[0252] 5. The fifth embodiment, as Figures 32 to 37 As shown.

[0253] On the basis of the fourth embodiment, the gas-liquid separator 109 and the balancing valve 112 are cancelled, and the first control valve 120 and the second control valve 121 are added to realize the collection of liquid from the low-pressure side and discharge to the medium-pressure side for cooling, and the collection of liquid from the low-pressure side and discharge to the high-pressure side for heating.

[0254] The air conditioning system of the fifth embodiment has a conventional cooling mode, such as Figure 32 As shown, the second control valve 121 is in the on state, the second liquid inlet valve 119, the first liquid discharge valve 115, the second liquid discharge valve 117 and the pressurizing valve 111 are all in the off state; and the conventional heating mode, such as Figure 33 As shown, the second control valve 121 is in the on state, and the first liquid inlet valve 113, the first liquid outlet valve 115 and the balance valve 112 are all in the off state.

[0255] In addition, the air conditioning system also has the following liquid collection mode and liquid discharge mode:

[0256] A. Refrigeration low-pressure side liquid collection mode: Figure 34 As shown, the pressurizing valve 111, the first liquid discharge valve 115, the second liquid discharge valve 117, the second liquid inlet valve 119, and the second control valve 121 are in the disconnected state. When the second liquid inlet valve 119 and the first control valve 120 are opened, the refrigerant returning to the low-pressure side from the four-way reversing valve 103 first passes through the second liquid inlet valve 119 and enters the liquid storage container 110. Most of the liquid refrigerant is stored in the liquid storage container 110, and the remaining small portion of gaseous refrigerant returns to the suction side of the compressor 101.

[0257] B. Refrigeration medium pressure side discharge mode: Figure 35 As shown, the first control valve 120 is in the disconnected state, the second control valve 121 is in the connected state, and the actions of the other valve bodies are consistent with the refrigeration medium-pressure side liquid discharge mode of the fourth embodiment.

[0258] C. Heating low-pressure side liquid collection mode, such as Figure 36 As shown, the valve body action is consistent with the refrigeration low-pressure side liquid collection mode of the fifth embodiment.

[0259] D. Heating high pressure side discharge mode, such as Figure 37 As shown, the first control valve 120 is in the disconnected state, the second control valve 121 is in the connected state, and the actions of the remaining valve bodies are consistent with the heating high-pressure side liquid discharge mode of the fourth embodiment.

[0260] In different operating modes, the valve bodies connected to the liquid storage container 110 operate as follows:

[0261] Table 5 Valve body movements in each working mode of the fifth embodiment

[0262]

[0263]

[0264] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An air conditioning system, characterized in that: include: A refrigerant circulation loop is provided with a compressor (101), an evaporator and a condenser, a high-pressure side pipeline is provided between the exhaust port of the compressor (101) and the condenser, a medium-pressure side pipeline is provided between the condenser and the evaporator, and a low-pressure side pipeline is provided between the evaporator and the air intake port of the compressor (101); A liquid storage container (110) for storing refrigerant and having a liquid inlet (A) and a liquid outlet (B); a liquid inlet pipeline, on which a liquid inlet valve having an on state and an off state is provided, a first end of the liquid inlet pipeline being in communication with the liquid inlet port (A), and a second end of the liquid inlet pipeline being in communication with at least one of the low-pressure side pipeline, the medium-pressure side pipeline, and the high-pressure side pipeline; and a liquid discharge pipeline, provided with a liquid discharge valve having an on state and an off state, wherein a first end of the liquid discharge pipeline is in communication with the liquid outlet (B), and a second end of the liquid discharge pipeline is in communication with at least one of the low-pressure side pipeline, the medium-pressure side pipeline, and the high-pressure side pipeline; Wherein, when the liquid inlet valve is in the on state, the pressure at the first end of the liquid inlet pipeline is lower than the pressure at the second end, so that the refrigerant in the refrigerant circulation loop is stored in the liquid storage container (110) by utilizing the pressure difference; when the liquid discharge valve is in the on state, the pressure at the first end of the liquid discharge pipeline is higher than the pressure at the second end, so that the refrigerant in the liquid storage container (110) is discharged to the refrigerant circulation loop by utilizing the pressure difference.

2. The air conditioning system according to claim 1, wherein: The liquid storage container (110) further comprises a pressure regulating port (C), and the air conditioning system further comprises: A pressure relief branch (3) is provided with a balancing valve (112) having an on state and an off state, and a first end of the pressure relief branch (3) is communicated with the pressure regulating port (C); Wherein, when the balancing valve (112) is in an on state, the pressure in the liquid storage container (110) is released through the pressure relief branch (3).

3. The air conditioning system according to claim 1 or 2, characterized in that: The liquid storage container (110) further comprises a pressure regulating port (C), and the air conditioning system further comprises: A pressurizing branch (4) is provided with a pressurizing valve (111) having an on state and an off state, and a first end of the pressurizing branch (4) is in communication with the pressure regulating port (C); When the pressurizing valve (111) is in an on state, the high-pressure side pipeline pressurizes the liquid storage container (110).

4. The air conditioning system according to claim 1, wherein: The liquid inlet pipeline comprises a first liquid inlet branch (1), a second end of the first liquid inlet branch (1) is connected to the medium-pressure side pipeline, and the liquid inlet valve comprises a first liquid inlet valve (113) provided on the first liquid inlet branch (1); and The liquid discharge pipeline comprises a first liquid discharge branch (2), a second end of the first liquid discharge branch (2) being configured to communicate with the low-pressure side pipeline in a cooling mode and to communicate with the high-pressure side pipeline in a heating mode, and the liquid discharge valve comprises a first liquid discharge valve (115) provided on the first liquid discharge branch (2).

5. The air conditioning system according to claim 4, wherein: The refrigerant circulation loop further includes a four-way reversing valve (103) and a gas-liquid separator (109), wherein the four-way reversing valve (103) is used for reversing when switching between the cooling mode and the heating mode, and the gas-liquid separator (109) is provided on a pipeline between the four-way reversing valve (103) and the air intake of the compressor (101); The air conditioning system further comprises a pressurizing branch (4), the second end of the first liquid discharge branch (2) is connected to the pipeline between the four-way reversing valve (103) and the evaporator, and the second end of the pressurizing branch (4) is connected to the pipeline between the exhaust port of the compressor (101) and the four-way reversing valve (103); the liquid storage container (110) further comprises a pressure regulating port (C), and the air conditioning system further comprises a pressure relief branch (3), the first end of the pressure relief branch (3) is connected to the pressure regulating port (C), and the second end of the pressure relief branch (3) is connected between the inlet of the gas-liquid separator (109) and the four-way reversing valve (103).

6. The air conditioning system according to claim 3, wherein: The liquid inlet (A) and the pressure regulating port (C) are arranged in the upper region of the liquid storage container (110), and the liquid outlet (B) is arranged in the lower region of the liquid storage container (110).

7. The air conditioning system according to any one of claims 1 to 6, characterized in that: The liquid inlet pipeline comprises a second liquid inlet branch (5), a second end of the second liquid inlet branch (5) is communicated with the low-pressure side pipeline, and the liquid inlet valve further comprises a second liquid inlet valve (119) provided on the second liquid inlet branch (5); and / or The liquid discharge pipeline includes a second liquid discharge branch (6), a second end of the second liquid discharge branch (6) is connected to the medium-pressure side pipeline, and the liquid discharge valve further includes a second liquid discharge valve (117) provided on the second liquid discharge branch (6).

8. The air conditioning system according to claim 7, wherein: The refrigerant circulation loop further includes a four-way reversing valve (103) and a gas-liquid separator (109), wherein the four-way reversing valve (103) is used for reversing when switching between the cooling mode and the heating mode, and the gas-liquid separator (109) is provided on a pipeline between the four-way reversing valve (103) and the air intake of the compressor (101); The second end of the second liquid inlet branch (5) is connected between the four-way reversing valve (103) and the inlet of the gas-liquid separator (109).

9. The air conditioning system according to claim 8, wherein: A main pipeline section (a) is formed between the four-way reversing valve (103) and the second end of the second liquid inlet branch (5), and a branch pipeline section (b) is formed between the second end of the second liquid inlet branch (5) and the inlet of the gas-liquid separator (109), and the main pipeline section (a) is connected to the second liquid inlet branch (5) and the branch pipeline section (b); The refrigerant flow resistance of the branch pipe section (b) is greater than the refrigerant flow resistance of the second liquid inlet branch (5).

10. The air conditioning system according to claim 9, wherein: The height of the second liquid inlet branch (5) is lower than the length section of the branch pipe section (b) close to the second end of the second liquid inlet branch (5); and / or The branch pipe section (b) is provided with a resistance increasing portion (10), and the resistance increasing portion (10) is configured to increase the refrigerant flow resistance of the branch pipe section (b).

11. The air conditioning system according to claim 1, wherein: The liquid inlet pipeline comprises a second liquid inlet branch (5) and a pressurizing branch (4); the second end of the second liquid inlet branch (5) is communicated with the low-pressure side pipeline; the liquid inlet valve comprises a second liquid inlet valve (119) provided on the second liquid inlet branch (5); the pressurizing branch (4) is provided with a pressurizing valve (111) having an on state and an off state; the first end of the pressurizing branch (4) is communicated with a pressure regulating port (C) of the liquid storage container (110); The drain pipeline includes a first drain branch (2) and / or a second drain branch (6); the second end of the first drain branch (2) is configured to communicate with the low-pressure side pipeline in cooling mode and communicate with the high-pressure side pipeline in heating mode; the second end of the second drain branch (6) is communicated with the medium-pressure side pipeline; the drain valve includes a first drain valve (115) provided on the first drain branch (2) and a second drain valve (117) provided on the second drain branch (6); The refrigerant circulation loop is provided with a second control valve (121) on the pipeline section between the second end of the second liquid inlet branch (5) and the air intake of the compressor (101); the liquid storage container (110) has an air outlet (D), and the air-conditioning system also includes a first control valve (120), the first end of the first control valve (120) is connected to the air outlet (D), and the second end of the first control valve (120) is connected to the pipeline section between the second control valve (121) and the air intake of the compressor (101).

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