Heat pump air conditioning system

Abstract

The invention discloses a heat pump air conditioning system which comprises a compressor and a heat pump, the four-way reversing valve is connected with the compressor and is configured to change the flow direction of a refrigerant; the indoor heat exchanger is connected with the four-way reversing valve; the outdoor heat exchanger is connected with the four-way reversing valve; the refrigerant storer is configured to store a refrigerant flowing through the refrigerant storer; the first pipeline is configured to connect the outdoor heat exchanger and the indoor heat exchanger; the branch pipeline is configured to be connected with the refrigerant storage and the first pipeline to form a refrigerant flow path; the adjustable on-off device is arranged on the first pipeline, and the adjustable on-off device is configured to adjust the flow of the refrigerant flowing through the refrigerant storage so as to adjust the refrigerant circulation amount in the air conditioning system. According to the air conditioning system, dynamic adjustment of the refrigerant circulation amount can be achieved, so that the requirements of the air conditioning system for the refrigerant amount under different working conditions are met.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to a heat pump air conditioning system. Background Technology

[0002] During the use of air conditioning products, the amount of circulating refrigerant required by the unit varies under different operating conditions. In order to balance the difference in the amount of refrigerant needed for heating and cooling, a liquid receiver is usually set in the system to store a portion of the refrigerant during operation. However, this can only meet the best balance effect under specific operating conditions and cannot dynamically adjust the circulation volume under different operating conditions.

[0003] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0004] In response to the problems mentioned in the background art, the present invention proposes a heat pump air conditioning system that can dynamically adjust the refrigerant circulation volume to meet the refrigerant volume requirements of the air conditioning system under different operating conditions.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In some embodiments of this application, a heat pump air conditioning system is provided, including: a compressor; a four-way reversing valve connected to the compressor and configured to change the refrigerant flow direction; an indoor heat exchanger connected to the four-way reversing valve; an outdoor heat exchanger connected to the four-way reversing valve; a refrigerant storage device configured to store flowing refrigerant; a first pipeline configured to connect the outdoor heat exchanger and the indoor heat exchanger; a branch pipeline configured to connect the refrigerant storage device and the first pipeline to form a refrigerant flow path; and an adjustable on / off device disposed on the first pipeline, configured to adjust the refrigerant flow rate through the refrigerant storage device to adjust the refrigerant circulation volume within the air conditioning system.

[0006] The above technical solution has the following advantages or beneficial effects: When the refrigerant flows between the indoor and outdoor heat exchangers, it passes through the first pipe. Based on the refrigerant quantity required by the air conditioning system, the opening of the adjustable on / off device changes the amount of refrigerant flowing into the branch pipes from the first pipe. This, in turn, adjusts the amount of refrigerant flowing through the refrigerant storage tank, thereby regulating the refrigerant circulation volume within the air conditioning system. Because the opening of the adjustable on / off device is adjustable and the refrigerant circulates through the refrigerant storage tank, dynamic adjustment of the refrigerant circulation volume can be achieved to meet the refrigerant quantity requirements of the air conditioning system under different operating conditions.

[0007] In some embodiments of this application, the air conditioning system further includes a first throttling device, which is provided on the first pipeline and is located on the side close to the outdoor heat exchanger. The air conditioning system also includes a second throttling device, which is provided on the first pipeline and is located on the side close to the indoor heat exchanger; The adjustable on / off device is disposed between the first throttling device and the second throttling device; The branch pipe includes a first sub-branch pipe, the first end of the first sub-branch pipe is connected to the first end of the refrigerant storage device, and the second end of the first sub-branch pipe is connected to the first pipe between the first throttling device and the adjustable on / off device. The branch pipe includes a second sub-branch pipe, the first end of which is connected to the second end of the refrigerant storage device, and the second end of which is connected to the first pipe between the second throttling device and the adjustable on / off device.

[0008] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects: The branch pipe and refrigerant storage device act as a bypass branch connected to the first pipe. When it is necessary to adjust the refrigerant circulation in the air conditioning system, the amount of refrigerant flowing through the refrigerant storage device is adjusted by changing the opening of the adjustable on / off device, thereby achieving dynamic adjustment of the refrigerant quantity. When it is not necessary to adjust the refrigerant circulation in the air conditioning system, the adjustable on / off device maintains its current opening. When the opening of the adjustable on / off device is increased to its limit and the first on / off device and / or the second on / off device are closed, the refrigerant does not flow through the refrigerant storage device, and the refrigerant circulation in the air conditioning system reaches its upper limit. When the opening of the adjustable on / off device is decreased to its limit and the first on / off device and the second on / off device are opened, the refrigerant does not flow through the adjustable on / off device, but flows through the refrigerant storage device, and the refrigerant circulation in the air conditioning system reaches its lower limit.

[0009] In some embodiments of this application, the air conditioning system has a first refrigerant regulation mode, in which the opening degree of the adjustable on / off device is increased, the branch pipe is opened, and the refrigerant flow through the refrigerant storage is reduced, thereby increasing the refrigerant circulation volume in the air conditioning system.

[0010] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects: The first refrigerant regulation mode is a control mode that increases the amount of refrigerant circulating. When the amount of refrigerant circulating in the air conditioning system is low, the air conditioning system will execute the first refrigerant regulation mode to increase the amount of refrigerant circulating.

[0011] In some embodiments of this application, the air conditioning system has a second refrigerant regulation mode, wherein the opening degree of the adjustable on / off device is reduced, the branch pipe is opened, and the refrigerant flow through the refrigerant storage is increased to reduce the amount of refrigerant circulating in the air conditioning system.

[0012] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects: The second refrigerant regulation mode is a control mode that reduces the amount of refrigerant circulating. When the amount of refrigerant circulating in the air conditioning system is detected to be too high, the air conditioning system will execute the second refrigerant regulation mode to reduce the amount of refrigerant circulating.

[0013] In some embodiments of this application, the air conditioning system has a third refrigerant regulation mode, in which the opening degree of the adjustable on / off device is increased to the limit position, the branch pipe is closed, and the refrigerant is prevented from flowing through the refrigerant storage device, thereby increasing the refrigerant circulation volume in the air conditioning system.

[0014] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects: The third refrigerant regulation mode is a control mode that maximizes the refrigerant circulation volume. When the opening of the adjustable on / off device is increased to the upper limit position, if the refrigerant circulation volume is still low, the first and second on / off devices are closed, the branch pipes are closed, so that the refrigerant no longer enters the refrigerant storage, and all the refrigerant participates in the system circulation, thereby maximizing the refrigerant circulation volume.

[0015] In some embodiments of this application, the refrigerant storage includes a plurality of heat exchange tubes configured to flow through refrigerant, and the heat exchange tubes are provided with heat dissipation fins.

[0016] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects: The refrigerant storage device is a heat exchanger structure in which the sum of the inner diameters of multiple heat exchange tubes is greater than the inner diameter of the branch pipes. When refrigerant flows through the refrigerant storage device, the multiple heat exchange tubes dynamically store the refrigerant, that is, they act as a buffer to store the refrigerant. Thus, by adjusting the amount of refrigerant flowing into the branch pipes, the refrigerant is stored in the refrigerant storage device, thereby achieving dynamic adjustment of the refrigerant circulation volume within the air conditioning system.

[0017] In some embodiments of this application, the air conditioning system has a fourth refrigerant regulation mode, in which the adjustable on / off device is closed, the branch pipe is open, the first throttling device does not throttle, and the second throttling device throttles, so that the refrigerant storage device exchanges heat with the flowing refrigerant.

[0018] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects: In the fourth refrigerant regulation mode, the refrigerant storage device does not function as a refrigerant storage device, but instead functions like the outdoor heat exchanger, used for heat exchange, increasing the heat exchange area of ​​the outdoor heat exchanger, and thus reducing high pressure and increasing exhaust superheat.

[0019] In some embodiments of this application, the refrigerant storage device is disposed at the bottom of the outdoor heat exchanger; The air conditioning system also includes a bypass pipeline, which is connected between the exhaust end pipeline of the compressor and the second sub-branch pipeline, and the bypass pipeline is equipped with an on / off device. The bypass line is configured to direct the high-temperature refrigerant discharged from the compressor to the refrigerant storage tank to prevent the outdoor heat exchanger from frosting.

[0020] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects: When the air conditioning system is in heating mode, there is a risk of frost forming on the outdoor heat exchanger. If this risk is detected, the third on / off device opens, the bypass line is opened, and the high-temperature refrigerant discharged from the compressor is diverted to the refrigerant storage tank via the bypass line. The temperature of the refrigerant storage tank rises, and since the refrigerant storage tank is located at the bottom of the outdoor heat exchanger, it transfers heat to the outdoor heat exchanger, preventing frost formation.

[0021] In some embodiments of this application, the air conditioning system has a fifth refrigerant regulation mode. When the air conditioning system is heating, it can execute the fifth refrigerant regulation mode, in which the bypass pipe is opened, and the high-temperature refrigerant discharged by the compressor flows to the refrigerant storage via the bypass pipe and the second sub-branch pipe to prevent the outdoor heat exchanger from frosting.

[0022] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects: When the air conditioning system is in heating mode, the adjustable on / off device is closed, and the first and second on / off devices are open. If a risk of frost formation is detected on the outdoor heat exchanger, the third on / off device is opened, and a portion of the high-temperature refrigerant discharged from the compressor flows to the refrigerant storage via the bypass pipe and the second sub-branch pipe to prevent frost formation on the outdoor heat exchanger.

[0023] When the air conditioning system is in heating mode, the adjustable on / off device is opened, and the first and second on / off devices are opened. If a risk of frost formation is detected on the outdoor heat exchanger, the third on / off device is opened. A portion of the high-temperature refrigerant discharged from the compressor flows to the refrigerant storage via the bypass pipe and the second sub-branch pipe to prevent frost formation on the outdoor heat exchanger.

[0024] In some embodiments of this application, a heat pump air conditioning system is provided, including: a compressor; a four-way reversing valve connected to the compressor and configured to change the refrigerant flow direction; an indoor heat exchanger connected to the four-way reversing valve; and an outdoor heat exchanger including: a refrigerant heat exchange zone configured to exchange heat with flowing refrigerant, the refrigerant heat exchange zone being connected to the four-way reversing valve; a refrigerant storage zone configured to store flowing refrigerant; a first pipeline configured to connect the refrigerant heat exchanger and the indoor heat exchanger; a branch pipeline configured to connect the refrigerant storage zone and the first pipeline to form a refrigerant flow path; and an adjustable on / off device disposed on the first pipeline, the adjustable on / off device being configured to adjust the refrigerant flow rate into the refrigerant storage zone to adjust the refrigerant circulation volume within the air conditioning system.

[0025] Another technical solution among the above-mentioned technical solutions has the following advantages or beneficial effects: When the refrigerant flows between the indoor and outdoor heat exchangers, it passes through the first pipe. Based on the refrigerant quantity required by the air conditioning system, the amount of refrigerant flowing into the branch pipes from the first pipe is varied by adjusting the opening of the adjustable on / off device. This, in turn, adjusts the amount of refrigerant flowing through the refrigerant storage area, thereby regulating the refrigerant circulation volume within the air conditioning system. Because the opening of the adjustable on / off device is adjustable and the refrigerant circulates through the refrigerant storage area, dynamic adjustment of the refrigerant circulation volume can be achieved to meet the refrigerant quantity requirements of the air conditioning system under different operating conditions.

[0026] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a heat pump air conditioning system during cooling according to some embodiments; Figure 2 This is yet another schematic diagram of a heat pump air conditioning system during cooling, according to some embodiments; Figure 3 This is yet another schematic diagram of a heat pump air conditioning system during cooling, according to some embodiments; Figure 4 This is a schematic diagram of a heat pump air conditioning system in heating mode according to some embodiments; Figure 5This is yet another schematic diagram of a heat pump air conditioning system in heating mode according to some embodiments; Figure 6 This is yet another schematic diagram of a heat pump air conditioning system in heating mode according to some embodiments; Figure 7 This is yet another schematic diagram of a heat pump air conditioning system in heating mode according to some embodiments; Figure 8 This is yet another schematic diagram of a heat pump air conditioning system in heating mode according to some embodiments; Figure 9 This is a control flowchart of a heat pump air conditioning system during cooling according to some embodiments; Figure 10 This is a control flowchart of a heat pump air conditioning system in heating mode according to some embodiments; Figure 11 This is a control flowchart for antifreeze operation of a heat pump air conditioning system according to some embodiments; Figure label: 1. Compressor; 2. Four-way reversing valve; 31. Outdoor heat exchanger; 32. Refrigerant storage device; 41. First throttling device; 42. Second throttling device; 5. Adjustable on / off device; 6. Indoor heat exchanger; 7. Third on / off device; 81. First on / off device; 82. Second on / off device; 9. First sensor; 10. Second sensor; 11. Third sensor; 12. Fourth sensor; 13. First pipeline; 14. Branch pipeline; 141. First sub-branch pipeline; 142. Second sub-branch pipeline; 15. Bypass pipeline. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] In some embodiments of this application, a heat pump air conditioning system is provided, with reference to... Figure 1 This includes compressor 1.

[0036] The heat pump air conditioning system also includes a four-way reversing valve 2, which is connected to the compressor 1 and is configured to change the direction of refrigerant flow.

[0037] The heat pump air conditioning system also includes an indoor heat exchanger 6, which is connected to a four-way reversing valve 2. The indoor heat exchanger 6 is configured to exchange heat with the refrigerant flowing through it.

[0038] The heat pump air conditioning system also includes an outdoor heat exchanger 31, which is connected to a four-way reversing valve 2. The outdoor heat exchanger 31 is configured to exchange heat with the refrigerant flowing through it.

[0039] The heat pump air conditioning system also includes a throttling device, which is configured to throttle the flow of refrigerant.

[0040] Indoor heat exchanger 6 and outdoor heat exchanger 31 function as either condensers or evaporators. When indoor heat exchanger 6 functions as a condenser, the air conditioner functions as a heater in heating mode. When indoor heat exchanger 6 functions as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0041] A heat pump air conditioning system performs a heat exchange cycle using a compressor, condenser, throttling device, and evaporator. The heat exchange cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0042] Low-temperature, low-pressure refrigerant enters compressor 1, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0043] The throttling device expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the throttling device and returns the low-temperature, low-pressure refrigerant gas to compressor 1. The evaporator achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0044] During the use of air conditioning products, the amount of refrigerant required by the unit varies under different operating conditions. In order to balance the difference in refrigerant amount under cooling and heating conditions during product development, a liquid receiver is usually set in the heat pump air conditioning system. The liquid receiver is used to store a part of the refrigerant during operation, but it can only meet the best balance effect under specific operating conditions and cannot dynamically adjust the amount of refrigerant circulating under different operating conditions.

[0045] To address this technical issue, the heat pump air conditioning system also includes a refrigerant storage unit 32, which is configured to store the refrigerant flowing through it. Unlike the liquid receiver in the prior art, the refrigerant storage unit 32 stores refrigerant dynamically, with the refrigerant circulating through it.

[0046] The heat pump air conditioning system also includes a first pipe 13, which is configured to connect the outdoor heat exchanger 31 and the indoor heat exchanger 6.

[0047] The heat pump air conditioning system also includes a branch pipe 14, which is configured to connect the refrigerant storage device 32 and the first pipe 13 to form a refrigerant flow path. In other words, the opposite ends of the branch pipe 14 are respectively connected to the first pipe 13, and the refrigerant storage device 32 is connected to the branch pipe 14.

[0048] The heat pump air conditioning system also includes an adjustable on / off device 5, which is installed on the first pipe 13. The adjustable on / off device 5 is configured to adjust the refrigerant flow through the refrigerant storage 32 to adjust the refrigerant circulation volume in the air conditioning system.

[0049] The adjustable on / off device 5 is a valve that can perform a regulating function. For example, the adjustable on / off device 5 is an electric valve.

[0050] When the refrigerant flows between the indoor heat exchanger 6 and the outdoor heat exchanger 31, it flows through the first pipe 13. Based on the required refrigerant quantity for the air conditioning system, the opening of the adjustable on / off device 5 is adjusted to change the amount of refrigerant flowing into the branch pipe 14 within the first pipe 13. This, in turn, adjusts the amount of refrigerant flowing through the refrigerant storage tank 32, thereby regulating the refrigerant circulation volume within the air conditioning system. Because the opening of the adjustable on / off device 5 is adjustable and the refrigerant circulates through the refrigerant storage tank 32, dynamic adjustment of the refrigerant circulation volume can be achieved to meet the refrigerant quantity requirements of the air conditioning system under different operating conditions.

[0051] In some embodiments of this application, the refrigerant storage 32 includes a plurality of heat exchange tubes configured to flow through refrigerant, and heat exchange tubes are provided with heat dissipation fins.

[0052] In other words, the refrigerant storage device 32 is a heat exchanger structure. The sum of the inner diameters of the multiple heat exchange tubes is greater than the inner diameter of the branch pipe 14. When the refrigerant flows through the refrigerant storage device 32, the multiple heat exchange tubes play a role in dynamically storing the refrigerant, that is, the multiple heat exchange tubes act as a buffer to store the refrigerant. In this way, by adjusting the amount of refrigerant flowing into the branch pipe 14, the refrigerant is stored in the refrigerant storage device 32, thereby realizing the dynamic adjustment of the refrigerant circulation volume in the air conditioning system.

[0053] In some embodiments of this application, the air conditioning system further includes a first throttling device 41, which is provided on the first pipeline 13 and is located on the side close to the outdoor heat exchanger 31.

[0054] The air conditioning system also includes a second throttling device 42, which is installed on the first pipe 13 and is located on the side close to the indoor heat exchanger 6.

[0055] The adjustable on / off device 5 is disposed between the first throttling device 41 and the second throttling device 42.

[0056] The branch pipe 14 includes a first sub-branch pipe 141, the first end of which is connected to the first end of the refrigerant storage 32, and the second end of which is connected to the first pipe 13 between the first throttling device 41 and the adjustable on / off device 5.

[0057] Branch pipe 14 includes a second sub-branch pipe 142. The first end of the second sub-branch pipe 142 is connected to the second end of the refrigerant storage 32, and the second end of the second sub-branch pipe 142 is connected to the first pipe 13 between the second throttling device 42 and the adjustable on / off device 5.

[0058] A first on / off device 81 is provided on the first sub-branch 141, and the first on / off device 81 is configured to open or close the first sub-branch 141.

[0059] A second on / off device 82 is provided on the second sub-branch 142, and the second on / off device 82 is configured to open or close the second sub-branch 142.

[0060] Reference Figure 2 or Figure 5 The branch pipe 14 and the refrigerant storage 32 are equivalent to a bypass branch connected to the first pipe 13. When it is necessary to adjust the refrigerant circulation in the air conditioning system, the amount of refrigerant flowing through the refrigerant storage 32 can be adjusted by adjusting the opening of the adjustable on / off device 5, thereby realizing the dynamic adjustment of the refrigerant amount.

[0061] When there is no need to adjust the refrigerant circulation in the air conditioning system, the adjustable on / off device 5 continues to operate at the current opening.

[0062] Reference Figure 3 or Figure 6 When the opening degree of the adjustable on / off device 5 is increased to the limit position, that is, when the adjustable on / off device 5 is adjusted to the upper limit of the opening degree, and the first on / off device 81 and / or the second on / off device 82 is closed, the refrigerant does not flow through the refrigerant storage 32, and the refrigerant circulation in the air conditioning system reaches the upper limit.

[0063] Reference Figure 1 or Figure 3 When the opening degree of the adjustable on / off device 5 is reduced to the limit position, the adjustable on / off device 5 is closed, and the first on / off device 81 and the second on / off device 82 are opened. The refrigerant does not flow through the adjustable on / off device 5, but flows through the refrigerant storage device 32, and the refrigerant circulation in the air conditioning system reaches the lower limit.

[0064] In some embodiments of this application, the adjustable on / off device 5 can be adjusted by gear control, step control, or gradient control.

[0065] In some embodiments of this application, the air conditioning system has a first refrigerant regulation mode, in which the opening degree of the adjustable on / off device 5 is increased, the branch pipe 14 is opened, and the refrigerant flow through the refrigerant storage 32 is reduced, thereby increasing the refrigerant circulation volume in the air conditioning system.

[0066] In other words, the first refrigerant regulation mode is a control mode that increases the amount of refrigerant circulating. When the amount of refrigerant circulating in the air conditioning system is detected to be low, the air conditioning system will execute the first refrigerant regulation mode to increase the amount of refrigerant circulating.

[0067] For example, when an air conditioning system is cooling, a refrigerant flow path reference is used. Figure 1 When the adjustable on / off device 5 is closed, the first on / off device 81 and the second on / off device 82 are opened, the refrigerant discharged from the compressor 1 flows sequentially through the four-way reversing valve 2, the outdoor heat exchanger 31, the first throttling device 41, the first on / off device 81, the refrigerant storage 32, the second on / off device 82, the second throttling device 42, the indoor heat exchanger 6, and the four-way reversing valve 2, and finally returns to the compressor 1.

[0068] If the refrigerant circulation volume in the air conditioning system is detected to be low, the refrigerant circulation volume needs to be increased. Refer to [the relevant guidelines / methods]. Figure 2 The opening degree of the adjustable on / off device 5 is increased, the branch pipe 14 is opened, the amount of refrigerant entering the refrigerant storage 32 is reduced, and more refrigerant participates in the refrigerant circulation of the air conditioning system, thereby increasing the amount of refrigerant circulating.

[0069] For example, when an air conditioning system is cooling, a refrigerant flow path reference is used. Figure 2 When the adjustable on / off device 5 is opened, the first on / off device 81 and the second on / off device 82 are opened. The refrigerant discharged from the compressor 1 flows sequentially through the four-way reversing valve 2, the outdoor heat exchanger 31 and the first throttling device 41. The refrigerant flowing out of the first throttling device 41 is divided into two paths. One path flows through the adjustable on / off device 5 to the second throttling device 42, and the other path flows through the first on / off device 81, the refrigerant storage device 32 and the second on / off device 82 to the second throttling device 42. The refrigerant flowing out of the second throttling device 42 then flows sequentially through the indoor heat exchanger 6 and the four-way reversing valve 2, and finally returns to the compressor 1.

[0070] If the amount of refrigerant circulating in the air conditioning system is low, the amount of refrigerant circulating needs to be increased. The opening of the adjustable on / off device 5 is increased, and the branch pipe 14 is opened, so that the amount of refrigerant entering the refrigerant storage 32 is reduced, and more refrigerant participates in the refrigerant circulation of the air conditioning system, thereby increasing the amount of refrigerant circulating.

[0071] For example, when an air conditioning system is in heating mode, a refrigerant flow path references... Figure 4When the adjustable on / off device 5 is closed, the first on / off device 81 and the second on / off device 82 are opened, the refrigerant discharged from the compressor 1 flows sequentially through the four-way reversing valve 2, the indoor heat exchanger 6, the second throttling device 42, the second on / off device 82, the refrigerant storage 32, the first on / off device 81, the first throttling device 41, the outdoor heat exchanger 31, and the four-way reversing valve 2, and finally returns to the compressor 1.

[0072] If the refrigerant circulation volume in the air conditioning system is detected to be low, the refrigerant circulation volume needs to be increased. Refer to [the relevant guidelines / methods]. Figure 5 The opening degree of the adjustable on / off device 5 is increased, the branch pipe 14 is opened, the amount of refrigerant entering the refrigerant storage 32 is reduced, and more refrigerant participates in the refrigerant circulation of the air conditioning system, thereby increasing the amount of refrigerant circulating.

[0073] For example, when an air conditioning system is in heating mode, a refrigerant flow path references... Figure 5 When the adjustable on / off device 5 is opened, the first on / off device 81 and the second on / off device 82 are opened. The refrigerant discharged from the compressor 1 flows sequentially through the four-way reversing valve 2, the indoor heat exchanger 6, and the second throttling device 42. The refrigerant flowing out of the second throttling device 42 is divided into two paths. One path flows through the adjustable on / off device 5 to the first throttling device 41, and the other path flows through the second on / off device 82, the refrigerant storage device 32, and the first on / off device 81 to the first throttling device 41. The refrigerant flowing out of the first throttling device 41 then flows sequentially through the outdoor heat exchanger 31 and the four-way reversing valve 2, and finally returns to the compressor 1.

[0074] If the amount of refrigerant circulating in the air conditioning system is low, the amount of refrigerant circulating needs to be increased. The opening of the adjustable on / off device 5 is increased, and the branch pipe 14 is opened, so that the amount of refrigerant entering the refrigerant storage 32 is reduced, and more refrigerant participates in the refrigerant circulation of the air conditioning system, thereby increasing the amount of refrigerant circulating.

[0075] In some embodiments of this application, the air conditioning system has a second refrigerant regulation mode, in which the opening degree of the adjustable on / off device 5 is reduced, the branch pipe 14 is opened, and the refrigerant flow through the refrigerant storage 32 is increased, so as to reduce the amount of refrigerant circulating in the air conditioning system.

[0076] In other words, the second refrigerant regulation mode is a control mode that reduces the amount of refrigerant circulating. When the amount of refrigerant circulating in the air conditioning system is detected to be too high, the air conditioning system will execute the second refrigerant regulation mode to reduce the amount of refrigerant circulating.

[0077] For example, when an air conditioning system is cooling, a refrigerant flow path reference is used. Figure 3When the adjustable on / off device 5 is opened, the first on / off device 81 and the second on / off device 82 are closed, the refrigerant discharged from the compressor 1 flows sequentially through the four-way reversing valve 2, the outdoor heat exchanger 31, the first throttling device 41, the adjustable on / off device 5, the second throttling device 42, the indoor heat exchanger 6, and the four-way reversing valve 2, and finally returns to the compressor 1.

[0078] If excessive refrigerant circulation is detected in the air conditioning system, the refrigerant circulation volume needs to be reduced. Refer to [the relevant guidelines / methods]. Figure 2 When the opening degree of the adjustable on / off device 5 is reduced, the first on / off device 81 and the second on / off device 82 are opened, the branch pipe 14 is connected, the amount of refrigerant entering the refrigerant storage 32 increases, the amount of refrigerant participating in the refrigerant circulation of the air conditioning system is reduced, and the effect of reducing the amount of refrigerant circulating is achieved.

[0079] For example, when an air conditioning system is cooling, a refrigerant flow path reference is used. Figure 2 When the adjustable on / off device 5 is opened, the first on / off device 81 and the second on / off device 82 are opened. The refrigerant discharged from the compressor 1 flows sequentially through the four-way reversing valve 2, the outdoor heat exchanger 31 and the first throttling device 41. The refrigerant flowing out of the first throttling device 41 is divided into two paths. One path flows through the adjustable on / off device 5 to the second throttling device 42, and the other path flows through the first on / off device 81, the refrigerant storage device 32 and the second on / off device 82 to the second throttling device 42. The refrigerant flowing out of the second throttling device 42 then flows sequentially through the indoor heat exchanger 6 and the four-way reversing valve 2, and finally returns to the compressor 1.

[0080] If a large amount of refrigerant is detected in the air conditioning system, the amount of refrigerant circulating needs to be reduced. The opening of the adjustable on / off device 5 is reduced, and the branch pipe 14 is kept open, so that the amount of refrigerant entering the refrigerant storage 32 increases, thereby reducing the amount of refrigerant participating in the refrigerant circulation of the air conditioning system and achieving the effect of reducing the amount of refrigerant circulating.

[0081] For example, when an air conditioning system is in heating mode, a refrigerant flow path references... Figure 6 When the adjustable on / off device 5 is opened, the first on / off device 81 and the second on / off device 82 are closed, the refrigerant discharged from the compressor 1 flows sequentially through the four-way reversing valve 2, the indoor heat exchanger 6, the second throttling device 42, the adjustable on / off device 5, the first throttling device 41, the outdoor heat exchanger 31, and the four-way reversing valve 2, and finally returns to the compressor 1.

[0082] If excessive refrigerant circulation is detected in the air conditioning system, the refrigerant circulation volume needs to be reduced. Refer to [the relevant guidelines / methods]. Figure 5 When the opening degree of the adjustable on / off device 5 is reduced, the first on / off device 81 and the second on / off device 82 are opened, the branch pipe 14 is connected, the amount of refrigerant entering the refrigerant storage 32 increases, the amount of refrigerant participating in the refrigerant circulation of the air conditioning system is reduced, and the effect of reducing the amount of refrigerant circulating is achieved.

[0083] For example, when an air conditioning system is in heating mode, a refrigerant flow path references... Figure 5 When the adjustable on / off device 5 is opened, the first on / off device 81 and the second on / off device 82 are opened. The refrigerant discharged from the compressor 1 flows sequentially through the four-way reversing valve 2, the indoor heat exchanger 6, and the second throttling device 42. The refrigerant flowing out of the second throttling device 42 is divided into two paths. One path flows through the adjustable on / off device 5 to the first throttling device 41, and the other path flows through the second on / off device 82, the refrigerant storage device 32, and the first on / off device 81 to the first throttling device 41. The refrigerant flowing out of the first throttling device 41 then flows sequentially through the outdoor heat exchanger 31 and the four-way reversing valve 2, and finally returns to the compressor 1.

[0084] If a large amount of refrigerant is detected in the air conditioning system, the amount of refrigerant circulating needs to be reduced. The opening of the adjustable on / off device 5 is reduced, and the branch pipe 14 is kept open, so that the amount of refrigerant entering the refrigerant storage 32 increases, thereby reducing the amount of refrigerant participating in the refrigerant circulation of the air conditioning system and achieving the effect of reducing the amount of refrigerant circulating.

[0085] In some embodiments of this application, the air conditioning system has a third refrigerant regulation mode, in which the opening degree of the adjustable on / off device 5 is increased to the limit position, the branch pipe 14 is closed, and the refrigerant is prevented from flowing through the refrigerant storage 32, so as to increase the amount of refrigerant circulating in the air conditioning system.

[0086] In other words, the third refrigerant regulation mode is a control mode that maximizes the refrigerant circulation volume. When the opening of the adjustable on / off device 5 is increased to the upper limit position, if the refrigerant circulation volume is still low, the first on / off device 81 and the second on / off device 82 are closed, and the branch pipe 14 is closed, so that the refrigerant no longer enters the refrigerant storage 32, and all the refrigerant participates in the system circulation, thereby achieving the purpose of maximizing the refrigerant circulation volume.

[0087] For example, refer to Figure 3 When the air conditioning system is cooling, in the third refrigerant regulation mode, the refrigerant discharged from the compressor 1 flows sequentially through the outdoor heat exchanger 31, the first throttling device 41, the adjustable on / off device 5, the second throttling device 42, the indoor heat exchanger 6, and the four-way reversing valve 2, and finally returns to the compressor 1. When the opening degree of the adjustable on / off device 5 is adjusted to the upper limit of the opening degree, the refrigerant does not flow through the refrigerant storage 32.

[0088] For example, refer to Figure 6 When the air conditioning system is heating, in the third refrigerant regulation mode, the refrigerant discharged from the compressor 1 flows sequentially through the indoor heat exchanger 6, the second throttling device 42, the adjustable on / off device 5, the first throttling device 41, the outdoor heat exchanger 31, and the four-way reversing valve 2, and finally returns to the compressor 1. When the opening degree of the adjustable on / off device 5 is adjusted to the upper limit of the opening degree, the refrigerant does not flow through the refrigerant storage 32.

[0089] In some embodiments of this application, the air conditioning system has a fourth refrigerant regulation mode, in which the adjustable on / off device 5 is closed, the branch pipe 14 is open, the first throttling device 41 does not throttle, and the second throttling device 42 throttles, so that the refrigerant storage 32 exchanges heat with the refrigerant flowing through it.

[0090] In other words, in the fourth refrigerant regulation mode, the refrigerant storage device 32 does not serve the function of refrigerant storage, but rather plays the same role as the outdoor heat exchanger 31, which is used for heat exchange, increases the heat exchange area of ​​the outdoor heat exchanger 31, and reduces the high pressure and increases the exhaust superheat.

[0091] For example, when the air conditioning system is cooling, refer to Figure 1 When the adjustable on / off device 5 is closed and the branch pipe 14 is open, if the refrigerant circulation volume in the detection system is still too high, the fourth refrigerant regulation mode is executed. The adjustable on / off device 5 continues to be closed, the branch pipe 14 continues to be open, the first throttling device 41 does not throttle, and the second throttling device 42 throttles, so that the function of the refrigerant storage device 32 changes. It no longer serves as a refrigerant storage device, but instead serves the same function as the outdoor heat exchanger 31 for heat exchange.

[0092] For example, when the air conditioning system is in heating mode, refer to Figure 4 When the adjustable on / off device 5 is closed and the branch pipe 14 is open, if the refrigerant circulation volume in the detection system is still too high, the fourth refrigerant regulation mode is executed. The adjustable on / off device 5 continues to be closed, the branch pipe 14 continues to be open, the first throttling device 41 does not throttle, and the second throttling device 42 throttles, so that the function of the refrigerant storage device 32 changes. It no longer serves as a refrigerant storage device, but instead serves the same function as the outdoor heat exchanger 31 for heat exchange.

[0093] In some embodiments of this application, the refrigerant storage 32 is disposed at the bottom of the outdoor heat exchanger 31.

[0094] The air conditioning system also includes a bypass pipe 15, which is connected between the exhaust pipe of the compressor 1 and the second sub-branch pipe 142. A third on / off device 7 is provided on the bypass pipe 15.

[0095] The bypass line 15 is configured to direct the high-temperature refrigerant discharged from the compressor 1 to the refrigerant storage 32 to prevent the outdoor heat exchanger 31 from frosting.

[0096] In other words, when the air conditioning system is heating, there is a risk of frost forming on the outdoor heat exchanger 31. If the risk of frost forming on the outdoor heat exchanger 31 is detected, the third on / off device 7 is opened, and the bypass pipe 15 is opened. The high-temperature refrigerant discharged from the compressor 1 is guided to the refrigerant storage device 32 through the bypass pipe 15. The temperature of the refrigerant storage device 32 rises. Since the refrigerant storage device 32 is located at the bottom of the outdoor heat exchanger 31, the refrigerant storage device 32 transfers heat to the outdoor heat exchanger 31, thus preventing the outdoor heat exchanger 31 from frosting.

[0097] In some embodiments of this application, the air conditioning system has a fifth refrigerant regulation mode. When the air conditioning system is heating, it can execute the fifth refrigerant regulation mode, in which the bypass pipe 15 is opened, and the high-temperature refrigerant discharged by the compressor 1 flows to the refrigerant storage 32 through the bypass pipe 15 and the second sub-branch pipe 142 to prevent the outdoor heat exchanger 31 from frosting.

[0098] For example, refer to Figure 7 When the air conditioning system is heating, the adjustable on / off device 5 is closed, and the first on / off device 81 and the second on / off device 82 are opened. If the outdoor heat exchanger 31 is detected to be at risk of frosting, the third on / off device 7 is opened, and a portion of the high-temperature refrigerant discharged by the compressor 1 flows to the refrigerant storage 32 through the bypass pipe 15 and the second sub-branch pipe 142 to prevent the outdoor heat exchanger 31 from frosting.

[0099] For example, refer to Figure 8 When the air conditioning system is heating, the adjustable on / off device 5 is opened, and the first on / off device 81 and the second on / off device 82 are opened. If the outdoor heat exchanger 31 is detected to be at risk of frosting, the third on / off device 7 is opened. A portion of the high-temperature refrigerant discharged by the compressor 1 flows to the refrigerant storage 32 through the bypass pipe 15 and the second sub-branch pipe 142 to prevent the outdoor heat exchanger 31 from frosting.

[0100] In some embodiments of this application, the outdoor heat exchanger 31 and the refrigerant storage unit 32 are configured as a single unit, collectively referred to as the outdoor heat exchanger. In other words, the outdoor heat exchanger includes a refrigerant heat exchange area and a refrigerant storage area, where the refrigerant heat exchange area corresponds to the outdoor heat exchanger 31 mentioned above, and the refrigerant storage area corresponds to the refrigerant storage unit 32 mentioned above.

[0101] By integrating the outdoor heat exchanger 31 and the refrigerant storage device 32 into a single unit within the outdoor unit, the structure becomes more compact. Furthermore, the refrigerant storage device 32 is located at the bottom of the outdoor heat exchanger 31. During the fifth refrigerant regulation mode, high-temperature refrigerant flows through the refrigerant storage device 32 to prevent frost buildup on the outdoor heat exchanger 31.

[0102] In some embodiments of this application, the outdoor heat exchanger 31 and the refrigerant storage 32 are configured as separate structures, and the two are arranged in a reasonable manner according to the internal space of the outdoor unit, so as to make full use of the internal space of the outdoor unit.

[0103] The refrigerant storage device 32 can be located near the bottom of the outdoor heat exchanger 31. For example, the refrigerant storage device 32 can be located directly below the outdoor heat exchanger 31, or it can be located to the side or slightly below the outdoor heat exchanger 31. In this case, high-temperature refrigerant can still flow through the refrigerant storage device 32 to prevent the outdoor heat exchanger 31 from frosting.

[0104] In some embodiments of this application, a first sensor 9 is provided on the exhaust pipe of the compressor 1, and the first sensor 9 is configured to detect the exhaust temperature Td of the compressor 1.

[0105] A second sensor 10 is installed on the first sub-branch pipe 141. The second sensor 10 is configured to detect the outlet refrigerant temperature Tr of the refrigerant storage 32 when the air conditioning system is heating.

[0106] A third sensor 11 is installed on the exhaust pipe of compressor 1. The third sensor 11 is configured to detect the high pressure Pd of the system.

[0107] A fourth sensor 12 is installed on the suction line of compressor 1. The fourth sensor 12 is configured to detect the low pressure Ps of the system.

[0108] The exhaust temperature Td and high pressure Pd are used to calculate the exhaust superheat Tdsh of the system.

[0109] The first throttling device 41 is denoted as EVO1, and the second throttling device 42 is denoted as EVO1.

[0110] In some embodiments of this application, reference is made to Figure 9 The control methods for air conditioning systems during cooling include: S1, the unit is in cooling operation. The unit's operating parameters are collected, including exhaust temperature Td, high pressure Pd, low pressure Ps, etc. The exhaust superheat Tdsh of the system is calculated based on the exhaust temperature Td and high pressure Pd. S2, the first throttling device 41 throttles the flow, and the second throttling device 42 is fully open, that is, the second throttling device 42 does not throttle the flow, and the process proceeds to S3; S3, determine whether the exhaust pressure Pd < a1 and the exhaust superheat Tdsh > b1 and the duration t1. If yes, it is determined that the system refrigerant circulation is low and enters the refrigerant circulation control S5. If no, enter S4. S5, increase refrigerant circulation control, specifically by increasing the opening degree of the adjustable on / off device 5, so that the amount of refrigerant entering the refrigerant storage 32 is reduced, and more refrigerant participates in the refrigerant circulation of the system, thereby increasing the refrigerant circulation. After increasing the refrigerant circulation control, proceed to S8. S8, determine whether the exhaust pressure Pd > a2 or the exhaust superheat Tdsh < b2. If so, it is determined that the system circulating refrigerant amount is appropriate at this time. When the unit completes the circulation control by increasing the refrigerant amount, the opening of the adjustable on / off device 5 continues to operate. At this time, the adjustment ends. Otherwise, proceed to S7. S7, determine whether the adjustable on / off device 5 has been adjusted to the limit. If so, it is determined that the amount of refrigerant circulating in the system is still too small, and enter the maximum refrigerant quantity cycle control S11. Otherwise, return to the increase refrigerant quantity cycle control S5 and continue to increase the opening. S11, maximize refrigerant circulation control, specifically by controlling the first on / off device 8181 to be in the closed state, so that the refrigerant no longer enters the refrigerant storage 32, and all the refrigerant participates in the system circulation, thereby achieving the purpose of maximizing the refrigerant circulation. At this time, the adjustment ends. S4, determine whether the compressor 1 discharge pressure Pd > a3 and discharge overnight degree Tdsh < b3 and duration t2. If so, it is determined that the system circulating refrigerant amount is too large, and enter the refrigerant amount reduction cycle control S6. Otherwise, it is determined that the current system circulating refrigerant amount is appropriate and no adjustment is required. S6, reduce refrigerant circulation control, specifically by reducing the opening degree of the adjustable on / off device 5, so that the amount of refrigerant entering the refrigerant storage 32 increases, so that more refrigerant is stored in the refrigerant storage 32, thereby reducing the amount of refrigerant in the system circulation, achieving the effect of reducing refrigerant circulation, and after reducing refrigerant circulation control, proceed to S9. S9, determine whether the compressor 1 discharge pressure Pd < a4 or the discharge superheat Tdsh > b4. If so, it is determined that the system circulating refrigerant amount is appropriate at this time. When the unit completes the refrigerant amount circulation control, the opening of the adjustable on / off device 5 continues to operate. At this time, the adjustment ends. Otherwise, proceed to S10. S10, determine whether the adjustable on / off device 5 has been reduced to the limit. If so, it is determined that the amount of refrigerant circulating in the system is still too large, and enter the switching EVO control S12. Otherwise, return to the refrigerant reduction cycle control S6 and continue to reduce the opening. S12, switch EVO control, specifically switch the functions of EVO1 and EVO2, so that EVO2 is throttled and EVO1 is not throttled. The function of refrigerant storage 32 changes and becomes consistent with the function of outdoor heat exchanger 31, so as to realize heat exchange and increase the heat exchange area of ​​outdoor heat exchanger 31, thereby reducing the high pressure Pd and increasing the exhaust superheat Tdsh. At this time, the adjustment ends.

[0111] In some embodiments of this application, reference is made to Figure 10 The control methods for air conditioning systems during heating include: S1, when the unit is in heating operation, and collect the unit's operating parameters; In S2, EVO1 is throttled, while EVO2 is not throttled, and proceeds to S3; S3, determine whether the compressor 1 suction pressure Ps < c1 and the duration t3. If so, it is determined that the system circulating refrigerant is too low, and enter the refrigerant quantity increase cycle control S5; otherwise, enter S4. S5, increase refrigerant circulation control, specifically by increasing the opening degree of the adjustable on / off device 5, so that the amount of refrigerant entering the refrigerant storage 32 is reduced, and more refrigerant participates in the refrigerant circulation of the system, thereby increasing the refrigerant circulation. After increasing the refrigerant circulation control, proceed to S8. S8, determine whether the suction pressure Ps of compressor 1 is greater than c2. If so, it is determined that the circulating refrigerant amount of the system is appropriate at this time. When the unit completes the cycle control by increasing the refrigerant amount, the opening of the adjustable on / off device 5 continues to operate. At this time, the adjustment ends. Otherwise, proceed to S7. S7, determine whether the adjustable on / off device 5 has been adjusted to the limit. If so, it is determined that the amount of refrigerant circulating in the system is still too small, and enter the maximum refrigerant quantity cycle control S10. Otherwise, return to the increase refrigerant quantity cycle control S5 and continue to increase the opening. S10, maximize refrigerant circulation control, specifically control the second on / off device 82 to be in the closed state, so that the refrigerant no longer enters the refrigerant storage 32, and all the refrigerant participates in the system circulation, so as to achieve the purpose of maximizing the refrigerant circulation. After maximizing the refrigerant circulation control, proceed to S11. S11, determine whether the suction pressure Ps of compressor 1 is greater than c2. If so, it is determined that the amount of refrigerant circulating in the system is appropriate at this time, and the unit continues to operate in the state of maximizing the refrigerant amount circulation control. At this time, the adjustment ends. Otherwise, it is determined that the amount of refrigerant circulating in the system is still too small, and enter the EVO switching control S12. S12, switch EVO control, specifically switch the functions of EVO1 and EVO2, so that EVO2 is throttled and EVO1 is not throttled, control the second on / off device 82 to the open state, and at the same time adjust the opening degree of the adjustable on / off device 5 to the minimum, the function of the refrigerant storage 32 changes to be consistent with the function of the outdoor heat exchanger 31, realize the heat exchange function, increase the heat exchange area of ​​the outdoor heat exchanger 31, and increase the suction pressure Ps. At this time, the adjustment ends. S4, determine whether the compressor 1 suction pressure Ps > c3 and the duration t4. If so, it is determined that the system circulating refrigerant amount is too large, and enter the refrigerant amount reduction cycle control S6. Otherwise, it is determined that the current system circulating refrigerant amount is appropriate and no adjustment is required. S6, reduce refrigerant circulation control, specifically by reducing the opening degree of the adjustable on / off device 5, so that the amount of refrigerant entering the refrigerant storage 32 increases, so that more refrigerant is stored in the refrigerant storage 32, thereby reducing the amount of refrigerant in the system circulation, achieving the effect of reducing refrigerant circulation, and after reducing refrigerant circulation control, proceed to S9. S9, determine whether the compressor 1 suction pressure Ps < c4 or the opening of the on / off device is reduced to the limit. If so, it is determined that the system circulating refrigerant amount is appropriate or cannot be adjusted. When the unit completes the refrigerant amount reduction cycle control, the opening of the adjustable on / off device 5 continues to operate. At this time, the adjustment ends. Otherwise, the refrigerant amount reduction cycle control continues.

[0112] In some embodiments of this application, reference is made to Figure 9 The control methods for air conditioning systems during antifreeze include: S1: During heating operation, the unit collects operating parameters and enters S2; S2, determine whether EVO1 is throttling. If so, it is determined that antifreeze control can be performed and proceed to S3. Otherwise, if the unit is throttling with EVO2, antifreeze control will affect the heating effect, so antifreeze control will not be performed. S3, determine whether the outlet temperature Tr of the refrigerant storage 32 is less than d1 and the duration is t5. If so, it is determined that the refrigerant storage 32 and the outdoor heat exchanger 31 are at risk of frosting, and enter the antifreeze control S4. Otherwise, do not enter the antifreeze control S5. S4, antifreeze control, the third on / off device 7 is opened, allowing the high-temperature refrigerant discharged by the compressor 1 to enter the refrigerant storage 32, raising the internal temperature of the refrigerant storage 32 and preventing frost formation. At this time, the unit continues to operate with the third on / off device 7 in the open state, and the control ends. S5, the third switching device 7 is closed.

[0113] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0114] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A heat pump air conditioning system, characterized in that, Including: compressor; A four-way reversing valve, connected to the compressor, is configured to change the direction of refrigerant flow; An indoor heat exchanger is connected to the four-way reversing valve. An outdoor heat exchanger is connected to the four-way reversing valve. A refrigerant storage device is configured to store the refrigerant that flows through it; The first pipeline is configured to connect the outdoor heat exchanger and the indoor heat exchanger; A branch pipe is configured to connect the refrigerant storage device to the first pipe to form a refrigerant flow path; An adjustable on / off device is installed on the first pipeline. The adjustable on / off device is configured to adjust the refrigerant flow through the refrigerant storage device in order to adjust the refrigerant circulation volume in the air conditioning system.

2. The heat pump air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a first throttling device, which is installed on the first pipeline and is located on the side close to the outdoor heat exchanger. The air conditioning system also includes a second throttling device, which is provided on the first pipeline and is located on the side close to the indoor heat exchanger; The adjustable on / off device is disposed between the first throttling device and the second throttling device; The branch pipe includes a first sub-branch pipe, the first end of the first sub-branch pipe is connected to the first end of the refrigerant storage device, and the second end of the first sub-branch pipe is connected to the first pipe between the first throttling device and the adjustable on / off device. The branch pipe includes a second sub-branch pipe, the first end of which is connected to the second end of the refrigerant storage device, and the second end of which is connected to the first pipe between the second throttling device and the adjustable on / off device.

3. The heat pump air conditioning system according to claim 2, characterized in that, The air conditioning system has a first refrigerant regulation mode, in which the opening degree of the adjustable on / off device is increased, the branch pipe is opened, and the refrigerant flow through the refrigerant storage is reduced, thereby increasing the refrigerant circulation volume in the air conditioning system.

4. The heat pump air conditioning system according to claim 2, characterized in that, The air conditioning system has a second refrigerant regulation mode. When the opening degree of the adjustable on / off device is reduced, the branch pipe is opened, increasing the refrigerant flow through the refrigerant storage device, thereby reducing the refrigerant circulation volume in the air conditioning system.

5. The heat pump air conditioning system according to claim 2, characterized in that, The air conditioning system has a third refrigerant regulation mode. When the opening degree of the adjustable on / off device is increased to the limit position, the branch pipe is closed to prevent refrigerant from flowing through the refrigerant storage device, thereby increasing the refrigerant circulation volume in the air conditioning system.

6. The heat pump air conditioning system according to claim 2, characterized in that, The refrigerant storage device includes multiple heat exchange tubes configured to carry refrigerant, and the heat exchange tubes are provided with heat dissipation fins.

7. The heat pump air conditioning system according to claim 6, characterized in that, The air conditioning system has a fourth refrigerant regulation mode, in which the adjustable on / off device is closed, the branch pipe is open, the first throttling device does not throttle, and the second throttling device throttles, so that the refrigerant storage device exchanges heat with the flowing refrigerant.

8. The heat pump air conditioning system according to any one of claims 2 to 7, characterized in that, The refrigerant storage device is located at the bottom of the outdoor heat exchanger; The air conditioning system also includes a bypass pipeline, which is connected between the exhaust end pipeline of the compressor and the second sub-branch pipeline, and the bypass pipeline is equipped with an on / off device. The bypass line is configured to direct the high-temperature refrigerant discharged from the compressor to the refrigerant storage tank to prevent the outdoor heat exchanger from frosting.

9. The heat pump air conditioning system according to claim 8, characterized in that, The air conditioning system has a fifth refrigerant regulation mode. When the air conditioning system is heating, it can execute the fifth refrigerant regulation mode. The bypass pipe is open, and the high-temperature refrigerant discharged by the compressor flows to the refrigerant storage through the bypass pipe and the second sub-branch pipe to prevent the outdoor heat exchanger from frosting.

10. A heat pump air conditioning system, comprising: compressor; A four-way reversing valve, connected to the compressor, is configured to change the direction of refrigerant flow; An indoor heat exchanger is connected to the four-way reversing valve. Its characteristic is that it further includes: Outdoor heat exchangers include: The refrigerant heat exchange zone is configured to exchange heat with the flowing refrigerant, and the refrigerant heat exchange zone is connected to the four-way reversing valve; The refrigerant storage area is configured to store the refrigerant that flows through it; The first pipeline is configured to connect the refrigerant heat exchanger to the indoor heat exchanger; A branch pipe is configured to connect the refrigerant storage area to the first pipe to form a refrigerant flow path; An adjustable on / off device is installed on the first pipeline. The adjustable on / off device is configured to adjust the refrigerant flow rate into the refrigerant storage area in order to adjust the refrigerant circulation volume in the air conditioning system.

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