Air conditioning system, control method thereof and machine readable storage medium

Abstract

The invention relates to the technical field of air treatment equipment, in particular to a control method of an air conditioning system, a machine readable storage medium and the air conditioning system. The control method of the air conditioning system comprises the following steps that the heat exchange mode and / or the outdoor environment temperature of the air conditioning system are / is obtained; and according to the outdoor environment temperature and / or the heat exchange mode, the second liquid storage part and the refrigerant circulation pipeline are controlled to be connected or disconnected. Compared with the prior art, the refrigerant adjusting device has a larger refrigerant adjusting amount, so that the liquid storage requirement under the low-temperature working condition can be met, and accumulation of the liquid refrigerant in the indoor heat exchanger under the low-temperature working condition is avoided. The problem that the air conditioning system is prone to liquid impact and liquid return under the ultralow-temperature working condition is solved, and the service life of the compressor and the service life of the four-way valve are prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of air handling equipment, and in particular to a control method for an air-conditioning system, a machine-readable storage medium, and an air-conditioning system. Background Art

[0002] At present, the amount of refrigerant required for cooling in a heat pump system is far greater than the amount of refrigerant required for heating. Heat pump systems usually include a liquid storage tank to store excess refrigerant during heating conditions. However, the lowest heating operating temperature of an ultra-low temperature air source heat pump can reach -40°C. As the operating ambient temperature decreases, the amount of circulating refrigerant required by the system is greatly reduced. When the excess refrigerant exceeds the capacity of the liquid storage tank, a large amount of liquid refrigerant will accumulate in the condenser. Therefore, the refrigerant capacity of existing liquid storage tanks cannot meet the refrigerant storage requirements for ultra-low temperature conditions. When the system is turned on or the defrost four-way valve is switched, the system refrigerant instantly reverses flow, and a large amount of liquid refrigerant will enter the four-way valve and compressor, causing liquid hammer and liquid backflow to the compressor and four-way valve, affecting the service life of the compressor and four-way valve. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a control method for an air-conditioning system, a machine-readable storage medium and an air-conditioning system that overcome the above problems or at least partially solve the above problems. The purpose is to solve the problem that liquid hammer and liquid return are prone to occur in existing air-conditioning systems under ultra-low temperature conditions, so as to improve the service life of the compressor and the four-way valve.

[0004] In one aspect, the present invention provides a control method for an air conditioning system, the air conditioning system comprising a refrigerant circulation pipeline and a refrigerant conditioning device, the refrigerant conditioning device comprising a first liquid storage portion and a second liquid storage portion, the first liquid storage portion and the second liquid storage portion being arranged in parallel, the first liquid storage portion being connected to the refrigerant circulation pipeline, the capacity of the first liquid storage portion being equal to the maximum liquid replenishment volume during cooling operation;

[0005] The control method includes:

[0006] Obtaining a heat exchange mode of the air conditioning system and / or an outdoor ambient temperature;

[0007] The second liquid storage part and the refrigerant circulation pipeline are controlled to be connected or blocked according to the outdoor ambient temperature and / or the heat exchange mode.

[0008] Optionally, the refrigerant regulating device further includes: a flow path control device, which is at least configured to control the connection or disconnection between the second liquid storage part and the refrigerant circulation pipeline.

[0009] Optionally, controlling the connection or disconnection between the second liquid storage unit and the refrigerant circulation pipeline according to the outdoor ambient temperature and / or the heat exchange mode includes:

[0010] When the heat exchange mode is heating, before or after the heating operation is started, if the outdoor ambient temperature is lower than a first preset temperature, the second liquid storage part is controlled to be connected to the refrigerant circulation pipeline.

[0011] Optionally, before or after the heating operation is started, if the outdoor ambient temperature satisfies a first preset temperature, controlling the second liquid storage part to be connected to the refrigerant circulation pipeline includes:

[0012] Before the heating operation is started, if the outdoor ambient temperature is lower than a first preset temperature, the second liquid storage part is controlled to be connected to the refrigerant circulation pipeline according to a first control strategy;

[0013] After the heating operation is started, if the outdoor ambient temperature is lower than a first preset temperature, the second liquid storage part is controlled to be connected to the refrigerant circulation pipeline according to a second control strategy.

[0014] Optionally, the first control strategy includes: simultaneously opening the liquid outlet side and the liquid inlet side of the second liquid storage part;

[0015] The second control strategy includes: opening the liquid outlet side of the second liquid storage part, and after a first preset time, opening the liquid inlet side of the second liquid storage part.

[0016] Optionally, controlling the connection or disconnection between the second liquid storage unit and the refrigerant circulation pipeline according to the outdoor ambient temperature and / or the heat exchange mode further includes:

[0017] During the heating operation, if the outdoor ambient temperature is greater than the second preset temperature, the second liquid storage part and the refrigerant circulation pipeline are cut off according to the third control strategy to replenish the refrigerant in the second liquid storage part to the refrigerant circulation pipeline.

[0018] Optionally, the third control strategy includes:

[0019] Control the compressor to reduce frequency to the preset frequency;

[0020] Controlling the cooling operation of the air conditioning system;

[0021] After a second preset time, closing the liquid outlet side and the liquid inlet side of the second liquid storage part;

[0022] Controlling the heating operation of the air conditioning system.

[0023] Optionally, controlling the connection or disconnection between the second liquid storage unit and the refrigerant circulation pipeline according to the outdoor ambient temperature and / or the heat exchange mode includes:

[0024] If the heat exchange mode of the air conditioning system is cooling, controlling the second liquid storage part and the refrigerant circulation pipeline to be cut off;

[0025] If the heat exchange mode of the air-conditioning system is heating, the second liquid storage part and the refrigerant circulation pipeline are controlled to be connected or cut off according to the outdoor ambient temperature.

[0026] Optionally, the first liquid storage portion and the second liquid storage portion are integrally arranged.

[0027] Optionally, the first liquid storage part and the second liquid storage part are distributed vertically.

[0028] Optionally, the refrigerant circulation pipeline includes: a first pipe section located between the indoor heat exchanger and the throttling device;

[0029] The first liquid storage portion and the first pipe section are arranged in parallel or in series.

[0030] On the other hand, the present invention further provides a machine-readable storage medium having a machine-executable program stored thereon, wherein the machine-executable program is capable of implementing any of the control methods described above when executed by a processor.

[0031] On the other hand, the present invention also provides an air-conditioning system, including a controller, the controller including a memory, a processor and a machine executable program stored in the memory and running on the processor, and when the processor executes the machine executable program, it implements the control method described in any one of the above items.

[0032] In the air-conditioning system control method, machine-readable storage medium, and air-conditioning system of the present invention, a second liquid storage part is added to the first liquid storage part in parallel with the first liquid storage part. Compared with the prior art, this allows the refrigerant regulating device to have a larger refrigerant regulating capacity, thereby meeting the liquid storage demand under low-temperature conditions and avoiding the accumulation of liquid refrigerant in the indoor heat exchanger under low-temperature conditions. In addition, before or after the heat exchange operation of the air-conditioning system, the opening or closing of the second liquid storage part is controlled according to at least one parameter in the outdoor ambient temperature and the heat exchange mode to adjust the amount of circulating refrigerant in the air-conditioning system, so that the air-conditioning system can have a suitable amount of circulating refrigerant under any operating conditions. Therefore, the present invention solves the problem that the air-conditioning system is prone to liquid hammer and liquid backflow under ultra-low temperature conditions, and improves the service life of the compressor and the four-way valve.

[0033] In addition, the control method of the present invention has the beneficial effect that the control procedure is simple and easy to execute.

[0034] Therefore, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0036] Figure 1 is a schematic flow chart of an air conditioning system control method according to an embodiment of the present invention;

[0037] Figure 2 is a schematic flow chart of an air conditioning system control method according to an embodiment of the present invention;

[0038] Figure 3 is a schematic flow chart of an air conditioning system control method according to an embodiment of the present invention;

[0039] Figure 4 is a schematic flow chart of an air conditioning system control method according to an embodiment of the present invention;

[0040] Figure 5 is a schematic flow chart of an air conditioning system control method according to an embodiment of the present invention;

[0041] Figure 6 is a schematic flow chart of an air conditioning system control method according to an embodiment of the present invention;

[0042] Figure 7 is a schematic flow chart of an air conditioning system control method according to an embodiment of the present invention;

[0043] Figure 8 is a schematic structural diagram of a machine-readable storage medium according to an embodiment of the present invention;

[0044] Figure 9 is a schematic structural diagram of an air conditioning system according to one embodiment of the present invention;

[0045] Figure 10 is a schematic working principle diagram of an air conditioning system according to one embodiment of the present invention;

[0046] Figure 11 1 is a schematic structural diagram of a refrigerant conditioning device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] Refer to the following Figures 1 to 11The air conditioning system control method, machine-readable storage medium, and air conditioning system according to embodiments of the present invention are described below. Terms such as "front," "rear," "upper," "lower," "top," "bottom," "inner," "outer," and "lateral" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate and simplify the description of the present invention and do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0048] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the definition of "first", "second", etc. can explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or more of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0049] Unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," "coupled," and the like should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise specified. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0050] Figure 1 is a schematic flow chart of a control method of an air conditioning system 100 according to an embodiment of the present invention, and Figure 2-7 , the present invention provides a control method for an air conditioning system 100. Figure 10 As shown, the air-conditioning system 100 includes a refrigerant circulation pipeline 110 and a refrigerant regulating device 120. The refrigerant regulating device 120 includes a first liquid storage part 121 and a second liquid storage part 122. The first liquid storage part 121 and the second liquid storage part 122 are arranged in parallel. The first liquid storage part 121 is connected to the refrigerant circulation pipeline 110. The capacity of the first liquid storage part 121 is equal to the maximum liquid replenishment amount during refrigeration operation.

[0051] like Figure 1 As shown, the control method of the air conditioning system 100 may include the following steps:

[0052] S100, obtaining a heat exchange mode of the air conditioning system 100 and / or an outdoor ambient temperature;

[0053] S200 , controlling the second liquid storage portion 122 and the refrigerant circulation pipeline 110 to be connected or disconnected according to the outdoor ambient temperature and / or the heat exchange mode.

[0054] In this embodiment, a second liquid reservoir 122, arranged in parallel with the first liquid reservoir 121, is added to the first liquid reservoir 121. Compared to the prior art, this allows the refrigerant conditioning device 120 to have a larger refrigerant conditioning capacity, thereby meeting the liquid storage requirements under low-temperature operating conditions and preventing the accumulation of liquid refrigerant in the indoor heat exchanger 113 under low-temperature conditions. Furthermore, before or after heat exchange operation of the air conditioning system 100, the second liquid reservoir 122 is controlled to be opened or closed based on at least one parameter of the outdoor ambient temperature and the heat exchange mode to adjust the amount of circulating refrigerant in the air conditioning system 100, thereby ensuring that the air conditioning system 100 has an appropriate amount of circulating refrigerant under all operating conditions. Therefore, this embodiment solves the problem of liquid hammer and liquid backflow that can easily occur in the air conditioning system 100 under ultra-low temperature conditions and increases the service life of the compressor 111 and the four-way valve 112.

[0055] Furthermore, in the heating operation mode, the first liquid storage portion maintains a passage with the refrigerant circulation pipeline 110 .

[0056] In some optional embodiments of the present invention, the refrigerant conditioning device 120 further includes a flow control device 123, which is configured to at least control the connection or disconnection between the second liquid storage portion 122 and the refrigerant circulation pipeline 110. In this embodiment, by providing the flow control device, the opening or closing of the second liquid storage portion 122 can be conveniently controlled.

[0057] like Figure 10 As shown, in some optional embodiments of the present invention, the flow control device 123 includes a first valve 1231 and a second valve 1232 to respectively control the on / off of the liquid inlet side and the liquid outlet side of the second liquid storage part 122. The flow control device 123 of this embodiment has the advantages of simple structure and easy operation. Preferably, the first valve 1231 and the second valve 1232 are both solenoid valves. In some alternative embodiments, the flow control device 123 can also be two three-way valves, one three-way valve is arranged on the liquid inlet side of the second liquid storage part 122, and the other three-way valve is arranged on the liquid storage side of the second liquid storage part 122.

[0058] In some optional embodiments of the present invention, the specific steps of obtaining the heat exchange mode of the air conditioning system 100 include: receiving a power-on signal of the air conditioning system 100; and determining the heat exchange mode of the air conditioning system 100 according to the power-on signal.

[0059] like Figure 2As shown, in some optional embodiments of the present invention, S200, according to the outdoor ambient temperature and / or the heat exchange mode, controls the second liquid storage part 122 and the refrigerant circulation pipeline 110 to be connected or cut off, and may include the following steps: S201, when the heat exchange mode is heating, before or after the heating operation is started, if the outdoor ambient temperature is less than or equal to the first preset temperature, controls the second liquid storage part 122 and the refrigerant circulation pipeline 110 to be connected.

[0060] Preferably, if the outdoor ambient temperature is less than or equal to the first preset temperature and lasts for a first preset time, the second liquid storage portion 122 is controlled to be connected to the refrigerant circulation pipeline 110. Through the above configuration, misjudgment can be avoided, thereby further improving control accuracy.

[0061] Specifically, before the air conditioning system 100 starts the heating mode, it determines whether the outdoor ambient temperature is less than or equal to a first preset temperature. If so, the second liquid storage portion 122 is controlled to be connected to the refrigerant circulation pipeline 110; if not, the second liquid storage portion 122 is controlled to be disconnected from the refrigerant circulation pipeline 110. After the air conditioning system 100 starts the heating mode, if the outdoor ambient temperature is less than or equal to the first preset temperature, the second liquid storage portion 122 is controlled to be connected to the refrigerant circulation pipeline 110. Alternatively, after the air conditioning system 100 starts the heating mode, it determines whether the outdoor ambient temperature is less than or equal to the first preset temperature. If so, the second liquid storage portion 122 is controlled to be connected to the refrigerant circulation pipeline 110; if not, the second liquid storage portion 122 is controlled to be disconnected from the refrigerant circulation pipeline 110. During the heating operation of the air conditioning system 100, if the outdoor ambient temperature is less than or equal to the first preset temperature, the second liquid storage portion 122 is controlled to be connected to the refrigerant circulation pipeline 110.

[0062] This embodiment provides a control method for an air-conditioning system 100 under low-temperature conditions. By controlling the second liquid storage portion 122 to be connected to the refrigerant circulation pipeline 110 under low-temperature conditions, the available liquid storage volume of the refrigerant regulating device 120 can be increased, thereby avoiding the accumulation of liquid refrigerant in the indoor heat exchanger 113 under low-temperature conditions, and thus effectively avoiding liquid hammer and liquid backflow, thereby improving the service life of the compressor 111 and the four-way valve 112.

[0063] like Figure 3 As shown, in some optional embodiments of the present invention, S201, before or after the start of the heating operation, if the outdoor ambient temperature is less than or equal to the first preset temperature, controlling the second liquid storage part 122 to be connected to the refrigerant circulation pipeline 110 includes the following steps:

[0064] S2011, before starting the heating operation, if the outdoor ambient temperature is less than or equal to the first preset temperature, controlling the second liquid storage portion 122 to be in communication with the refrigerant circulation pipeline 110 according to the first control strategy;

[0065] S2012 , after the heating operation is started, if the outdoor ambient temperature is less than or equal to the first preset temperature, controlling the second liquid storage portion 122 to be connected to the refrigerant circulation pipeline 110 according to the second control strategy.

[0066] In this embodiment, under ultra-low temperature conditions, before and after the start of the heating operation, the second liquid storage part 122 and the refrigerant circulation pipeline 110 are controlled to be connected according to different control strategies, thereby improving control accuracy and facilitating system stability.

[0067] In some alternative embodiments, before or after the heating operation is started, if the outdoor ambient temperature is less than or equal to the first preset temperature, the second liquid storage portion 122 is controlled to be connected to the refrigerant circulation pipeline 110 according to the first control strategy.

[0068] In some optional embodiments of the present invention, the first control strategy includes: simultaneously opening the liquid outlet side and the liquid inlet side of the second liquid storage part 122 .

[0069] The second control strategy includes: opening the liquid outlet side of the second liquid storage part 122 , and opening the liquid inlet side of the second liquid storage part 122 after a first preset time.

[0070] Specifically, before the heating operation is started, if the outdoor ambient temperature is less than or equal to the first preset temperature, the liquid outlet side and the liquid inlet side of the second liquid storage part 122 are opened at the same time, so that the second liquid storage part 122 is connected to the refrigerant circulation pipeline 110, so that the second liquid storage part 122 can store liquid after the heating operation is started.

[0071] After heating operation is initiated, if the outdoor ambient temperature is less than or equal to a first preset temperature, the liquid outlet of the second liquid reservoir 122 is opened. After a first preset time, the liquid inlet of the second liquid reservoir 122 is opened, connecting the second liquid reservoir 122 to the refrigerant circulation pipeline 110 to allow the second liquid reservoir 122 to store liquid. This method prevents a large amount of refrigerant from suddenly flowing into the second liquid reservoir 122, thereby improving the stability of the air conditioning system 100.

[0072] like Figure 4 As shown, in some optional embodiments of the present invention, S200 controls the connection or disconnection of the second liquid storage part 122 and the refrigerant circulation pipeline 110 according to the outdoor ambient temperature and / or the heat exchange mode, and also includes: S202, during the heating operation, if the outdoor ambient temperature is greater than or equal to the second preset temperature, controls the disconnection of the second liquid storage part 122 and the refrigerant circulation pipeline 110 according to the third control strategy to replenish the refrigerant in the second liquid storage part 122 to the refrigerant circulation pipeline 110.

[0073] Preferably, during heating operation, if the outdoor ambient temperature is greater than or equal to a second preset temperature and persists for a second preset duration, the second liquid storage portion 122 and the refrigerant circulation pipeline 110 are disconnected according to a third control strategy to replenish the refrigerant in the second liquid storage portion 122 to the refrigerant circulation pipeline 110. This arrangement can avoid misjudgments and further improve control accuracy.

[0074] Specifically, the second preset temperature is greater than, equal to, or less than the first preset temperature. During heating operation, if the outdoor ambient temperature is greater than or equal to the second preset temperature, indicating that the outdoor ambient temperature is no longer in an ultra-low temperature operating state, the refrigerant in the second liquid storage section 122 is replenished into the refrigerant circulation pipeline 110, which helps ensure the stability and heat exchange effect of the air conditioning system 100. In addition, because the second liquid storage section 122 is arranged in parallel with the first liquid storage section 121, it is more convenient to replenish the refrigerant in the second liquid storage section 122 into the refrigerant circulation pipeline 110 to participate in the refrigerant circulation.

[0075] like Figure 5 As shown, in some optional embodiments of the present invention, the third control strategy may include the following steps:

[0076] S2021, controlling the compressor 111 to reduce the frequency to a preset frequency;

[0077] S2022, controlling the air conditioning system 100 to operate in cooling mode;

[0078] S2023, after the second preset time, closing the liquid outlet and liquid inlet sides of the second liquid storage portion 122;

[0079] S2024, controlling the air conditioning system 100 to operate in heating mode.

[0080] Specifically, the preset frequency in step S2021 is not a fixed value and can be set according to the model of air conditioning system 100. Step S2022 specifically involves controlling the refrigerant flow reversal in air conditioning system 100, namely, controlling the reversing direction of the reversing device connected to compressor 111, which can be a four-way valve 112. Step S2023 specifically involves closing the liquid outlet and liquid inlet of second liquid storage unit 122 after air conditioning system 100 has been operating in cooling mode for a second preset time, thereby isolating second liquid storage unit 122 from refrigerant circulation pipeline 110.

[0081] This embodiment provides a method for controlling the second liquid storage part 122 when the ultra-low temperature working condition is converted to a non-ultra-low temperature working condition. When the system does not need the second liquid storage part 122 to store refrigerant, the above method can quickly replenish the refrigerant in the second liquid storage part 122 to the refrigerant circulation pipeline 110 to participate in the refrigerant circulation.

[0082] like Figure 6As shown, in some optional embodiments of the present invention, S200, controlling the connection or disconnection between the second liquid storage portion 122 and the refrigerant circulation pipeline 110 according to the outdoor ambient temperature and / or the heat exchange mode, may include the following steps:

[0083] S203, if the heat exchange mode of the air conditioning system 100 is cooling, the second liquid storage portion 122 and the refrigerant circulation pipeline 110 are controlled to be cut off;

[0084] S204 , if the heat exchange mode of the air conditioning system 100 is heating, the second liquid storage portion 122 and the refrigerant circulation pipeline 110 are controlled to be connected or disconnected according to the outdoor ambient temperature.

[0085] Before the air conditioning system 100 is operated, the second liquid storage portion 122 is controlled to be open or closed according to the heat exchange mode of the air conditioning system 100; then, the air conditioning system 100 is controlled to operate in the corresponding heat exchange mode. With the above configuration, the air conditioning system 100 can maintain good heat exchange capacity in both heating and cooling modes.

[0086] like Figure 10 and Figure 11 As shown, in some optional embodiments of the present invention, the first liquid storage portion 121 and the second liquid storage portion 122 are integrally provided. By means of the above arrangement, the installation space of the refrigerant conditioning device 120 can be saved and the assembly efficiency of the refrigerant conditioning device 120 can be improved.

[0087] Furthermore, if Figure 10 and Figure 11 As shown, the first liquid storage part 121 and the second liquid storage part 122 are distributed vertically. Specifically, the refrigerant conditioning device 120 includes a liquid storage tank, and a partition 124 is provided in the liquid storage tank to form the first liquid storage part 121 and the second liquid storage part 122.

[0088] Furthermore, the first liquid storage part 121 is located above the second liquid storage part 122 .

[0089] In some optional embodiments of the present invention, the refrigerant circulation pipeline 110 includes a first pipe section located between the indoor heat exchanger 113 and the throttling device 115. A first liquid storage portion 121 is provided in parallel with the first pipe section. This arrangement facilitates the storage of excess liquid refrigerant in the indoor heat exchanger 113 into the second heat exchange portion during heating operation under ultra-low temperature conditions.

[0090] In other optional embodiments, the first liquid storage portion 121 may also be arranged in series with the first pipe section.

[0091] In other optional embodiments, the first liquid storage portion 121 may also be connected in parallel or in series with other pipe sections of the refrigerant circulation pipeline 110 .

[0092] In some optional embodiments of the present invention, the air conditioning system 100 is an air conditioning unit. Further, the air conditioning system 100 is an air source heat pump unit.

[0093] like Figure 10 As shown, in a preferred embodiment of the present invention, an air conditioning unit includes a refrigerant circulation pipeline 110 and a refrigerant conditioning device 120. Refrigerant circulation pipeline 110 is equipped with a compressor 111, a four-way valve 112, an indoor heat exchanger 113, an intermediate heat exchanger 114, a throttling device 115, an auxiliary electronic expansion valve 144, an outdoor heat exchanger 116, a gas-liquid separator 117, an air injection valve 143, a first solenoid valve 141, a second solenoid valve 142, a first temperature sensor 151, a second temperature sensor 152, a third temperature sensor 153, a fourth temperature sensor 154, a fifth temperature sensor 155, and a sixth temperature sensor 156. The outdoor heat exchanger 116 is equipped with a seventh temperature sensor 157, an eighth temperature sensor 158, and a ninth temperature sensor 159. The water inlet of the indoor heat exchanger 113 is equipped with an eleventh temperature sensor 1511, and the water outlet is equipped with a twelfth temperature sensor 1512. The throttling device 115 is a primary electronic expansion valve.

[0094] The refrigerant regulating device 120 includes a first liquid storage branch and a second liquid storage branch. The first liquid storage branch and the second liquid storage branch are both connected in parallel with the second pipe section. The second pipe section is the portion of the refrigerant circulation pipeline 110 located between the indoor heat exchanger 113 and the intermediate heat exchanger 114. The first liquid storage branch is connected to the second pipe section, that is, the first liquid storage portion 121 is connected to the refrigerant circulation pipeline 110. A flow control device 123 is provided on the second liquid storage branch. The flow control device 123 includes a first valve 1231 and a second valve 1232. Figure 11 As shown, the first liquid storage portion 121 and the second liquid storage portion 122 are an integrated structure, separated by a partition 124 , and the first liquid storage portion 121 is disposed above the second liquid storage portion 122 .

[0095] like Figure 7 As shown, in this embodiment, the control method of the air conditioner includes:

[0096] S1, receiving a power-on signal of the air-conditioning system 100.

[0097] S2, determining the heat exchange mode of the air conditioning system 100 according to the power-on signal; if the heat exchange mode of the air conditioning system 100 is cooling, executing S31; if the heat exchange mode of the air conditioning system 100 is heating, executing S41.

[0098] S31, controlling the first valve 1231 and the second valve 1232 to remain in a closed state.

[0099] S32, controlling the air conditioning system 100 to start and operate in cooling mode.

[0100] S41, obtaining the outdoor ambient temperature to obtain a first temperature.

[0101] S42, determining whether the first temperature is less than or equal to a first preset temperature and lasts for a first preset time period; if so, executing S51; if not, executing S61.

[0102] S51, opening the first valve 1231 and the second valve 1232.

[0103] S52, controlling the air conditioning system 100 to start and operate in heating mode.

[0104] S53, obtaining the outdoor ambient temperature to obtain a second temperature;

[0105] S54, determining whether the second temperature is greater than or equal to the second preset temperature and lasts for a second preset time period; if so, executing S55; if not, executing S53.

[0106] S55: Control the compressor 111 to reduce the frequency to a preset frequency, control the four-way valve 112 to switch, and after a second preset time, close the first valve 1231 and the second valve 1232, and control the four-way valve 112 to switch again. Then, execute S63.

[0107] S61, controlling the first valve 1231 and the second valve 1232 to remain in a closed state.

[0108] S62, controlling the air conditioning system 100 to start and operate in heating mode.

[0109] S63: Acquire the outdoor ambient temperature to obtain a third temperature.

[0110] S64, determining whether the third temperature is less than or equal to the first preset temperature and lasts for a first preset time period; if so, executing S65; if not, executing S63.

[0111] S65, open the second valve 1232, and after the first preset time, open the first valve 1231; then execute S53.

[0112] This embodiment solves the problem that liquid hammer and liquid return easily occur in the air-conditioning system 100 under ultra-low temperature conditions, thereby increasing the service life of the compressor 111 and the four-way valve 112.

[0113] Furthermore, when the heating mode is activated, the second liquid storage unit is opened or closed based on the outdoor ambient temperature. This configuration improves the liquid storage efficiency of the second liquid storage unit and better prevents liquid hammer and liquid backflow.

[0114] Furthermore, during heating operation, the second liquid reservoir is opened by first opening the valve on the side of the second liquid reservoir away from the indoor heat exchanger, and then opening the valve on the side of the second liquid reservoir close to the heat exchanger. This prevents a sudden influx of refrigerant into the second liquid reservoir.

[0115] Furthermore, the following method is used to shut down the second liquid reservoir: first, the compressor frequency is reduced, then the four-way valve is reversed. After a preset cooling time, the second liquid reservoir is disconnected. The four-way valve is then reversed to operate in heating mode. This allows the liquid refrigerant in the second liquid reservoir to be quickly released into the circulation system, improving heat exchange efficiency.

[0116] Figure 8 is a schematic diagram of a machine-readable storage medium 200 according to an embodiment of the present invention. Figure 8 As shown, an embodiment of the present invention further provides a machine-readable storage medium 200 on which a machine executable program 201 is stored. When the machine executable program 201 is executed by the processor 132, the control method of the air-conditioning system 100 according to any of the above embodiments is implemented.

[0117] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any machine-readable storage medium 200 for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor 132, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or used in combination with these instruction execution systems, devices or apparatuses.

[0118] For the purposes of the present embodiment, the machine-readable storage medium 200 can be any device that can contain, store, communicate, propagate, or transmit a program for use with an instruction execution system, device, or apparatus, or in conjunction with such an instruction execution system, device, or apparatus. More specific examples (not an exhaustive list) of the machine-readable storage medium 200 include the following: an electrical connection portion having one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory 131 (RAM), read-only memory 131 (ROM), erasable and editable read-only memory 131 (EPROM or flash memory 131), a fiber optic device, and a portable compact disc read-only memory 131 (CDROM). In addition, the machine-readable storage medium 200 can even be paper or other suitable medium on which the program can be printed, as the program can be obtained electronically, for example, by optically scanning the paper or other medium, and then editing, interpreting, or otherwise processing it in a suitable manner as needed, and then stored in the memory 131.

[0119] Figure 9 is a schematic diagram of an air conditioning system 100 according to an embodiment of the present invention, as shown in FIG. Figure 9 As shown, an embodiment of the present invention further provides an air conditioning system 100, which includes a controller 130. The controller 130 includes a memory 131, a processor 132, and a machine executable program 201 stored in the memory 131 and running on the processor 132. When the processor 132 executes the machine executable program 201, the air conditioning system control method according to any of the above embodiments is implemented.

[0120] Specifically, the controller 130 may include a processor 132 adapted to execute stored instructions, and a memory 131 that provides temporary storage for the instructions during operation. The processor 132 may be a single-core processor 132, a multi-core processor 132, a computing cluster, or any number of other configurations. The memory 131 may include random access memory 131 (RAM), read-only memory 131, flash memory, or any other suitable storage system.

[0121] The processor 132 can be connected to an I / O interface (input / output interface) suitable for connecting the air conditioning system 100 to one or more I / O devices (input / output devices) via a system interconnect (e.g., PCI, PCI-Express, etc.). The I / O devices may include, for example, a keyboard and a pointing device, wherein the pointing device may include a touchpad or a touch screen, etc.

[0122] The processor 132 may also be linked to a display interface suitable for connecting the controller 130 to a display device via a system interconnect. The display device may include a display screen as a built-in component of the controller 130. The display device may also include a computer monitor, a television, or a projector, etc., externally connected to the air conditioning system 100. In addition, a network interface controller (NIC) may be suitable for connecting the controller 130 to a network via a system interconnect. In some embodiments, the NIC may use any suitable interface or protocol (such as an Internet Small Computer System Interface, etc.) to transmit data. The network may be a cellular network, a radio network, a wide area network (WAN), a local area network (LAN), or the Internet, etc. Remote devices may be connected to the controller 130 via a network.

[0123] The flowchart provided in this embodiment is not intended to indicate that the operations of the method will be performed in any particular order, or that all operations of the method are included in all every case. In addition, the method may include additional operations. Within the scope of the technical ideas provided by the method of this embodiment, additional changes can be made to the above method.

[0124] The present invention has a plurality of exemplary embodiments, but, without departing from the spirit and scope of the present invention, many other variations or modifications that are consistent with the principles of the present invention can be directly determined or derived from the content disclosed in the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A method for controlling an air conditioning system, characterized in that: The air conditioning system includes a refrigerant circulation pipeline and a refrigerant regulating device, the refrigerant regulating device includes a first liquid storage part and a second liquid storage part, the first liquid storage part and the second liquid storage part are arranged in parallel, the first liquid storage part is connected to the refrigerant circulation pipeline, and the capacity of the first liquid storage part is equal to the maximum liquid replenishment volume during cooling operation; The control method includes: Obtaining a heat exchange mode of the air conditioning system and / or an outdoor ambient temperature; The second liquid storage part and the refrigerant circulation pipeline are controlled to be connected or blocked according to the outdoor ambient temperature and / or the heat exchange mode.

2. The control method according to claim 1, characterized in that: The refrigerant conditioning device further includes: A flow control device is configured to at least control the connection or disconnection between the second liquid storage portion and the refrigerant circulation pipeline.

3. The control method according to claim 1, wherein: The controlling of the connection or disconnection between the second liquid storage unit and the refrigerant circulation pipeline according to the outdoor ambient temperature and / or the heat exchange mode includes: When the heat exchange mode is heating, before or after the heating operation is started, if the outdoor ambient temperature is lower than a first preset temperature, the second liquid storage part is controlled to be connected to the refrigerant circulation pipeline.

4. The control method according to claim 3, characterized in that: The method of controlling the second liquid storage unit to be connected to the refrigerant circulation pipeline if the outdoor ambient temperature is lower than a first preset temperature before or after the heating operation is started includes: Before the heating operation is started, if the outdoor ambient temperature is lower than a first preset temperature, the second liquid storage part is controlled to be connected to the refrigerant circulation pipeline according to a first control strategy; After the heating operation is started, if the outdoor ambient temperature is lower than a first preset temperature, the second liquid storage part is controlled to be connected to the refrigerant circulation pipeline according to a second control strategy.

5. The control method according to claim 4, characterized in that: The first control strategy includes: simultaneously opening the liquid outlet side and the liquid inlet side of the second liquid storage part; The second control strategy includes: opening the liquid outlet side of the second liquid storage part, and after a first preset time, opening the liquid inlet side of the second liquid storage part.

6. The control method according to claim 3, characterized in that: The method of controlling the connection or disconnection between the second liquid storage unit and the refrigerant circulation pipeline according to the outdoor ambient temperature and / or the heat exchange mode further includes: During the heating operation, if the outdoor ambient temperature is greater than the second preset temperature, the second liquid storage part and the refrigerant circulation pipeline are cut off according to the third control strategy to replenish the refrigerant in the second liquid storage part to the refrigerant circulation pipeline.

7. The control method according to claim 6, characterized in that: The third control strategy includes: Control the compressor to reduce frequency to the preset frequency; Controlling the cooling operation of the air conditioning system; After a second preset time, closing the liquid outlet side and the liquid inlet side of the second liquid storage part; Controlling the heating operation of the air conditioning system.

8. The control method according to claim 1, characterized in that: The controlling of the connection or disconnection between the second liquid storage unit and the refrigerant circulation pipeline according to the outdoor ambient temperature and / or the heat exchange mode includes: If the heat exchange mode of the air conditioning system is cooling, controlling the second liquid storage part and the refrigerant circulation pipeline to be cut off; If the heat exchange mode of the air-conditioning system is heating, the second liquid storage part and the refrigerant circulation pipeline are controlled to be connected or cut off according to the outdoor ambient temperature.

9. The control method according to claim 1, characterized in that: The first liquid storage part and the second liquid storage part are integrally provided.

10. The control method according to claim 9, characterized in that: The first liquid storage part and the second liquid storage part are distributed vertically.

11. The control method according to claim 1, characterized in that: The refrigerant circulation pipeline includes: a first pipe section located between the indoor heat exchanger and the throttling device; The first liquid storage portion and the first pipe section are arranged in parallel or in series.

12. A machine-readable storage medium, characterized in that A machine executable program is stored thereon, and when the machine executable program is executed by a processor, the control method according to any one of claims 1 to 11 is implemented.

13. An air conditioning system, characterized in that: The invention comprises a controller, wherein the controller comprises a memory, a processor and a machine executable program stored in the memory and running on the processor, and when the processor executes the machine executable program, the control method according to any one of claims 1 to 11 is implemented.

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