Air conditioning system

Abstract

The utility model provides an air conditioning system. The air conditioning system comprises a compressor, an outdoor heat exchanger, a throttling component and an indoor heat exchanger which are connected through a refrigerant pipeline to form a main heat exchange loop. The inlet end of the first branch selectively communicates with the main heat exchange loop, and the first branch is configured to convey the refrigerant throttled by the throttling component in the main heat exchange loop to an air supply port of the compressor; the inlet end of the second branch is selectively communicated with an exhaust port of the compressor; and a first heat exchanger, the second branch being thermally coupled to the first branch through the first heat exchanger. According to the technical scheme, the liquid return problem of the compressor under the limiting working condition can be solved.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning technology, and in particular to an air conditioning system. Background Technology

[0002] Currently, enthalpy-increasing methods in refrigeration systems are suitable for conventional operating conditions. However, under extreme conditions such as ultra-low temperature refrigeration and ultra-low temperature heating, the refrigerant in the enthalpy-increasing circuit absorbs less heat after throttling, resulting in poor refrigerant quality in that circuit. Most of the refrigerant enters the compressor in pure liquid or gas-liquid two-phase form, leading to liquid return issues under extreme conditions. Liquid return not only causes liquid slugging but also dilutes the lubricating oil, causing wear. During wear, the motor load and current increase significantly, eventually leading to motor failure. Furthermore, the compressor's discharge temperature drops sharply, posing a challenge to the compressor's reliability. Utility Model Content

[0003] The purpose of this disclosure is to provide an air conditioning system and its control method and device to improve the compressor liquid return problem under extreme operating conditions.

[0004] The first aspect of this disclosure provides an air conditioning system, comprising:

[0005] The compressor, outdoor heat exchanger, throttling device, and indoor heat exchanger are connected by refrigerant pipelines to form the main heat exchange circuit.

[0006] The first branch, with its inlet end optionally connected to the main heat exchange circuit, is configured to deliver the refrigerant in the main heat exchange circuit that has been throttled by the throttling component to the air supply port of the compressor.

[0007] The second branch, with its inlet end optionally connected to the exhaust port of the compressor; and

[0008] The first heat exchanger is used to thermally couple the second branch to the first branch, so that the gaseous refrigerant discharged from the compressor can transfer heat to the refrigerant in the first branch.

[0009] In some embodiments of the air conditioning system, the first heat exchanger is located at the inlet end of the second branch.

[0010] In some embodiments of the air conditioning system, a second heat exchanger is also included, wherein the refrigerant line between the indoor heat exchanger and the inlet end of the first branch is thermally coupled to the first branch through the second heat exchanger, so that the refrigerant line between the indoor heat exchanger and the inlet end of the first branch can transfer heat to the refrigerant in the first branch.

[0011] In some embodiments of the air conditioning system, the outlet end of the second branch is connected to the refrigerant line between the indoor heat exchanger and the second heat exchanger.

[0012] In some embodiments of the air conditioning system, the air conditioning system has a first operating mode and a second operating mode.

[0013] In the first operating mode, the inlet end of the first branch is connected to the air supply port of the compressor, and the inlet end of the second branch is connected to the exhaust port of the compressor.

[0014] In the second operating mode, the inlet end of the first branch is connected to the air supply port of the compressor, and the inlet end of the second branch is disconnected from the exhaust port of the compressor.

[0015] In some embodiments of the air conditioning system, the following are included:

[0016] A first control valve is configured to connect or disconnect the inlet and outlet ends of the first branch, thereby controlling the connection or disconnection between the inlet end of the first branch and the gas supply port of the compressor; and / or

[0017] The second control valve is configured to connect or disconnect the inlet and outlet ends of the second branch, thereby controlling the connection or disconnection between the inlet end of the second branch and the exhaust port of the compressor.

[0018] In some embodiments of the air conditioning system, a reversing valve and multiple throttling components are included. The multiple throttling components include a first throttling component and a second throttling component. The reversing valve is disposed in the main heat exchange circuit and has a first operating state and a second operating state. In the first operating state, the compressor, the outdoor heat exchanger, the first throttling component, the inlet end of the first branch, and the indoor heat exchanger are arranged sequentially along the refrigerant flow direction. In the second operating state, the compressor, the indoor heat exchanger, the second throttling component, the inlet end of the first branch, and the outdoor heat exchanger are arranged sequentially along the refrigerant flow direction.

[0019] A second aspect of this disclosure provides a control method for an air conditioning system according to a first aspect of this disclosure, comprising: if the ambient temperature of the air conditioning system is lower than a first preset value, causing the first branch to deliver refrigerant that has been throttled in the main heat exchange circuit to the air inlet of the compressor, and causing the inlet end of the second branch to be connected to the exhaust port of the compressor, so that the gaseous refrigerant discharged by the compressor transfers heat to the refrigerant in the first branch.

[0020] In some embodiments of the air conditioning system control method, the method includes: if the exhaust temperature of the compressor is higher than a second preset value and / or the exhaust superheat of the compressor is higher than a third preset value, disconnecting the inlet end of the second branch from the exhaust port of the compressor.

[0021] A third aspect of this disclosure provides a computer-readable storage medium having control instructions stored thereon, which, when executed by a processor, implement the control method described in the second aspect of this disclosure.

[0022] A fourth aspect of this disclosure provides a control device for an air conditioning system, comprising:

[0023] Memory; and

[0024] A processor, coupled to the memory, is configured to implement the control method according to the second aspect of this disclosure based on instructions stored in the memory.

[0025] Considering the issue of poor refrigerant quality in the first branch under extremely low temperature conditions, the air conditioning system provided in this disclosure allows the second branch to draw out high-temperature gaseous refrigerant from the compressor's discharge port. This gaseous refrigerant is then thermally coupled to the first branch via a first heat exchanger. Through heat exchange with the refrigerant in the first branch, the refrigerant in the second branch can be heated before entering the compressor, causing it to completely evaporate into a gaseous state. This improves the quality of the refrigerant entering the compressor and reduces the risk of liquid return from the compressor. Therefore, the air conditioning system provided in this disclosure can improve the liquid return problem of the compressor under extreme operating conditions, thereby enhancing the compressor's reliability and service life.

[0026] In the control method of the air conditioning system provided in this disclosure, the first preset value is used to determine whether the ambient temperature is in the low temperature range. If the ambient temperature is lower than the first preset value, it indicates that the ambient temperature is low. The air conditioning system not only needs to activate the enthalpy-increasing function, but also the refrigerant temperature in the first branch is low. At this time, by connecting the inlet end of the second branch to the exhaust port of the compressor, the second branch can enable the gaseous refrigerant discharged by the compressor to transfer heat to the refrigerant in the first branch. Therefore, the liquid return problem of the compressor under extreme operating conditions can be improved.

[0027] The computer-readable storage medium provided in this disclosure can be used to implement the control method of the air conditioning system provided in the embodiments of this disclosure, and therefore has the advantages of the air conditioning system and control method provided in this disclosure.

[0028] The control device for the air conditioning system provided in this disclosure can be used to implement the control method for the air conditioning system provided in the embodiments of this disclosure, and therefore has the advantages of the air conditioning system and control method provided in this disclosure.

[0029] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings:

[0031] Figure 1 This is a schematic diagram illustrating the working principle of an air conditioning system according to some embodiments of the present disclosure.

[0032] Figure 2 This is a schematic diagram illustrating the working principle of an air conditioning system according to some other embodiments of this disclosure.

[0033] In the attached figures, the various reference numerals represent:

[0034] 1. Compressor; 2. Oil separator; 3. Reversing valve; 4. Outdoor heat exchanger; 5. Refrigerant heat dissipation module; 6. First throttling component; 7. Gas-liquid separator; 8. Second control valve; 9. First heat exchanger; 10. First control valve; 11. Second heat exchanger; 12. Indoor heat exchanger; 13. Second throttling component. Detailed Implementation

[0035] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0037] In the description of this disclosure, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0038] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0039] Embodiments of this disclosure provide an air conditioning system and its control method, a computer-readable storage medium, and a control device.

[0040] refer to Figure 1 and Figure 2 The air conditioning system provided in the embodiments of this disclosure includes a compressor 1, an outdoor heat exchanger 4, at least one throttling component, an indoor heat exchanger 12, a first branch, a second branch, and a first heat exchanger 9.

[0041] Compressor 1, outdoor heat exchanger 4, throttling device, and indoor heat exchanger 12 are connected via refrigerant piping to form a main heat exchange circuit. The inlet of the first branch is optionally connected to the main heat exchange circuit and is configured to deliver the refrigerant throttled by the throttling device in the main heat exchange circuit to the gas injection port of compressor 1. The inlet of the second branch is optionally connected to the exhaust port of compressor 1. The second branch is thermally coupled to the first branch through the first heat exchanger 9 so that the gaseous refrigerant discharged from compressor 1 can transfer heat to the refrigerant in the first branch.

[0042] Optionally, the first heat exchanger 9 is a shell-and-tube heat exchanger. Optionally, the throttling device includes a first throttling device 6. Optionally, the air conditioning system includes one indoor heat exchanger 12 or multiple indoor heat exchangers 12 connected in parallel, and the throttling device includes one second throttling device 13 corresponding to one indoor heat exchanger 12 or multiple second throttling devices 13 corresponding to multiple indoor heat exchangers 12 connected in parallel. Optionally, refer to... Figure 1 and Figure 2 The air conditioning system includes multiple indoor heat exchangers 12 arranged in parallel, and the throttling components include a first throttling component 6 and multiple second throttling components 13 arranged corresponding to the multiple indoor heat exchangers 12. Figure 1The dashed arrows in the diagram show the direction of refrigerant flow in the air conditioning system of some embodiments of this disclosure when cooling the room. During cooling, the first branch can selectively deliver the refrigerant throttled by the first throttling component 6 to the air supply port of the compressor 1. Figure 2 The solid arrows in the diagram illustrate the refrigerant flow direction of an air conditioning system according to some embodiments of this disclosure when heating the room. During heating, the first branch can selectively deliver refrigerant throttled by the second throttling component 13 to the air supply port of the compressor 1. Optionally, the inlet end of the first branch is connected to the refrigerant pipeline between the first throttling component 6 and the plurality of second throttling components 13.

[0043] The outlet of the first branch can be connected to the intermediate-pressure chamber of compressor 1 through the compressor 1's air inlet, thus eliminating a process from the low-pressure chamber to the intermediate-pressure chamber of compressor 1 and reducing the work done by compressor 1. Furthermore, setting up the first branch increases the refrigerant charge in the air conditioning system, enhancing the refrigerant's heat exchange capacity. Under normal ambient temperature conditions, the first branch can increase enthalpy, which is highly beneficial for enhancing the overall cooling capacity of the refrigeration system. However, under some extreme operating conditions, such as when the environment is at extremely low temperatures, the refrigerant drawn from the heat exchange circuit in the first branch may not carry enough heat. The refrigerant quality in the first branch may be poor, often existing in a pure liquid or gas-liquid two-phase state, leading to a risk of liquid return to compressor 1.

[0044] Considering the issue of poor refrigerant quality in the first branch under extremely low temperature conditions, the air conditioning system provided in this disclosure provides a second branch that draws out high-temperature gaseous refrigerant from the exhaust port of compressor 1 and thermally couples it with the first branch through the first heat exchanger 9. By exchanging heat with the refrigerant in the first branch, the refrigerant in the second branch can increase its temperature before entering compressor 1, completely evaporating into a gaseous state. This improves the quality of the refrigerant entering compressor 1 and reduces the risk of liquid return from compressor 1. Therefore, the air conditioning system provided in this disclosure can improve the liquid return problem of the compressor under extreme operating conditions, thereby improving the reliability and service life of the compressor.

[0045] In some embodiments of the air conditioning system, the first heat exchanger 9 is located at the inlet end of the second branch.

[0046] In the air conditioning system of this embodiment, since the first heat exchanger 9 is located at the inlet end of the second branch, the heat loss before the refrigerant in the second branch exchanges with the refrigerant in the first branch can be reduced, so that the refrigerant in the second branch and the refrigerant in the first branch maintain a large temperature difference during heat exchange, thereby improving the heat exchange effect of both.

[0047] In some embodiments of the air conditioning system, a second heat exchanger 11 is also included. The refrigerant pipeline of the main heat exchange circuit between the indoor heat exchanger 12 and the inlet end of the first branch is thermally coupled to the first branch through the second heat exchanger 11, so that the refrigerant pipeline between the indoor heat exchanger 12 and the inlet end of the first branch can transfer heat to the refrigerant in the first branch.

[0048] Optionally, the second heat exchanger 11 is a shell-and-tube heat exchanger. Optionally, the second heat exchanger 11 is disposed in the refrigerant pipeline between the first throttling component 6 and the second throttling component 13.

[0049] In the air conditioning system of this embodiment, the temperature of the refrigerant in the refrigerant pipeline between the indoor heat exchanger 12 and the inlet end of the first branch is higher than the temperature of the refrigerant entering the first branch from the inlet end of the first branch. The refrigerant in the first branch can first exchange heat with the refrigerant in the refrigerant pipeline at the corresponding position of the heat exchange circuit through the second heat exchanger 11, and then exchange heat with the refrigerant in the second branch through the first heat exchanger 9, so that the refrigerant in the first branch can fully absorb heat, thereby further improving the quality of the refrigerant in the first branch.

[0050] In some embodiments of the air conditioning system, the outlet end of the second branch is connected to the refrigerant line between the indoor heat exchanger 12 and the second heat exchanger 11.

[0051] Optionally, the outlet end of the second branch is connected to the refrigerant pipeline between the second heat exchanger 11 and the second throttling component 13.

[0052] In this embodiment of the air conditioning system, the refrigerant in the second branch, after exchanging heat with the refrigerant in the first branch, can return to the main heat exchange circuit, achieving refrigerant recycling. The inlet of the second branch is positioned close to the exhaust port of compressor 1, which facilitates the extraction of high-temperature, high-pressure gaseous refrigerant. The outlet of the second branch is positioned so that the temperature and state of the refrigerant discharged from the second branch are similar to those of the refrigerant in the corresponding position in the main heat exchange circuit. This improves the quality of the refrigerant in the first branch while reducing the impact on the operation of the main heat exchange circuit.

[0053] In some embodiments of the air conditioning system, the air conditioning system has a first operating mode and a second operating mode. In the first operating mode, the inlet end of the first branch is connected to the air supply port of the compressor 1, and the inlet end of the second branch is connected to the exhaust port of the compressor 1. In the second operating mode, the inlet end of the first branch is connected to the air supply port of the compressor 1, and the inlet end of the second branch is disconnected from the exhaust port of the compressor 1.

[0054] In this embodiment of the air conditioning system, when the ambient temperature is extremely low, the air conditioning system can be put into the first working mode, which diverts the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 through the second branch, thereby improving the quality of the refrigerant in the first branch and achieving compressor intake enthalpy increase through the refrigerant in the first branch. However, when the compressor discharge temperature is high, heating the refrigerant in the first branch through the refrigerant in the second branch may cause the temperature of the refrigerant entering the compressor 1 through the first branch to be too high. In this case, the air conditioning system can be put into the second working mode to stop heating the refrigerant in the first branch and prevent adverse effects on the operation of the compressor 1.

[0055] In some embodiments of the air conditioning system, a first control valve 10 and / or a second control valve 8 are included. The first control valve 10 is configured to connect or disconnect the inlet and outlet ends of a first branch, thereby connecting or disconnecting the inlet end of the first branch from the air supply port of the compressor 1. The second control valve 8 is configured to connect or disconnect the inlet and outlet ends of a second branch, thereby connecting or disconnecting the inlet end of the second branch from the exhaust port of the compressor 1.

[0056] Optionally, the first control valve 10 and the second control valve 8 are solenoid valves with on / off control functions. The first control valve 10 and the second control valve 8 may also be control valves with flow regulation functions, thereby flexibly adjusting the on / off state of the two ends of the first branch and the two ends of the second branch, as well as the flow rate of refrigerant in the first branch and the second branch, according to the actual operating conditions of the air conditioning system.

[0057] In the air conditioning system of this embodiment, by setting a first control valve 10, the inlet end of the first branch can be connected or disconnected from the gas supply port of the compressor 1, thereby determining whether to activate the enthalpy-increasing function according to the actual operating conditions of the air conditioning system; by setting a second control valve 8, the inlet end of the second branch can be connected or disconnected from the exhaust port of the compressor 1, thereby determining whether to draw out the refrigerant with a higher temperature through the second branch to heat the refrigerant with a lower temperature in the first branch according to the actual operating conditions of the air conditioning system.

[0058] In some embodiments of the air conditioning system, a reversing valve 3 and multiple throttling components are included. The multiple throttling components include a first throttling component 6 and a second throttling component 13. The reversing valve 3 is disposed in the main heat exchange circuit and has a first operating state and a second operating state. In the first operating state, the compressor 1, the outdoor heat exchanger 4, the first throttling component 6, the inlet end of the first branch and the indoor heat exchanger 12 are arranged sequentially along the refrigerant flow direction. In the second operating state, the compressor 1, the indoor heat exchanger 12, the second throttling component 13, the inlet end of the first branch and the outdoor heat exchanger 4 are arranged sequentially along the refrigerant flow direction.

[0059] Optionally, refer to Figure 1 and Figure 2The reversing valve 3 is a four-way valve. The first port of the four-way valve is connected to the discharge port of the compressor 1, the second port is connected to multiple indoor heat exchangers 12, the third port is connected to the suction port of the compressor 1, and the fourth port is connected to the outdoor heat exchanger 4. In the first operating state, the first and fourth ports are connected, and the second and third ports are connected; in the second operating state, the first and second ports are connected, and the third and fourth ports are connected.

[0060] Optionally, refer to Figure 1 and Figure 2 The air conditioning system also includes an oil separator 2, which is located in the refrigerant line between the discharge port of the compressor 1 and the first oil port of the four-way valve. Optionally, refer to... Figure 1 and Figure 2 The air conditioning system also includes a refrigerant heat dissipation module 5, which is disposed in the refrigerant pipeline between the first throttling component 6 and the inlet end of the first branch. Optionally, refer to Figure 1 and Figure 2 The air conditioning system also includes a gas-liquid separator 7, which is located in the refrigerant pipeline between the air inlet of the compressor 1 and the third oil port of the four-way valve.

[0061] refer to Figure 1 The direction of the dashed arrow in this embodiment of the air conditioning system indicates that when the reversing valve 3 is in its first operating state, the refrigerant circulates in the heat exchange circuit in the sequence of compressor 1, outdoor heat exchanger 4, first throttling component 6, indoor heat exchanger 12, and compressor 1, cooling the room. At this time, the outdoor heat exchanger 4 acts as a condenser, and the indoor heat exchanger 12 acts as an evaporator. When the ambient temperature is extremely low, the condensation temperature of the outdoor heat exchanger 4 is low, and the temperature of the refrigerant at the inlet of the first branch is also correspondingly low, resulting in insufficient heat carrying capacity. Heating through the second branch can improve the quality of the refrigerant in the first branch.

[0062] refer to Figure 2 The direction of the solid arrow in this embodiment of the air conditioning system indicates that when the reversing valve 3 is in the second operating state, the refrigerant circulates in the heat exchange circuit in the sequence of compressor 1, indoor heat exchanger 12, second throttling component 13, outdoor heat exchanger 4, and compressor 1, providing heat to the room. At this time, indoor heat exchanger 12 acts as a condenser, and outdoor heat exchanger 4 acts as an evaporator. When the ambient temperature is extremely low, the evaporation temperature of outdoor heat exchanger 4 is low, and the temperature of the refrigerant at the inlet of the first branch is also correspondingly low, resulting in insufficient heat carrying capacity. Heating through the second branch can improve the quality of the refrigerant in the first branch.

[0063] The control method of the air conditioning system provided in the embodiments of this disclosure includes: if the ambient temperature of the air conditioning system is lower than a first preset value, the first branch delivers the refrigerant that has been throttled in the main heat exchange circuit to the gas injection port of the compressor 1, and the inlet end of the second branch is connected to the exhaust port of the compressor 1, so that the gaseous refrigerant discharged by the compressor 1 transfers heat to the refrigerant in the first branch.

[0064] The first branch can deliver the throttled refrigerant to the air supply port of compressor 1 by changing the on / off state of the first control valve 10 mentioned above; the inlet of the second branch can be connected to the exhaust port of compressor 1 by changing the on / off state of the second control valve 8 mentioned above.

[0065] In the control method of the air conditioning system provided in the embodiments of this disclosure, the first preset value is used to determine whether the ambient temperature is in the low temperature range. If the ambient temperature is lower than the first preset value, it indicates that the ambient temperature is low. The air conditioning system not only needs to activate the enthalpy-increasing function, but also the refrigerant temperature in the first branch is low. At this time, by connecting the inlet end of the second branch to the exhaust port of the compressor 1, the second branch can enable the gaseous refrigerant discharged by the compressor 1 to transfer heat to the refrigerant in the first branch, thus improving the liquid return problem of the compressor under extreme operating conditions.

[0066] In some embodiments of the air conditioning system control method, if the exhaust temperature of compressor 1 is higher than a second preset value and / or the exhaust superheat of compressor 1 is higher than a third preset value, the inlet end of the second branch is disconnected from the exhaust port of compressor 1.

[0067] In the control method of the air conditioning system provided in this embodiment, the second preset value and the third preset value are used to determine whether the exhaust temperature of the compressor 1 is in the high temperature range. When the exhaust temperature of the compressor 1 is greater than the second preset value and / or the exhaust superheat of the compressor 1 is greater than the third preset value, it indicates that the exhaust temperature of the compressor 1 is high. Heat exchange between the second branch and the first branch may cause the refrigerant temperature in the first branch to be too high, which in turn causes the refrigerant temperature drawn into the compressor 1 through the air inlet to be too high. At this time, by disconnecting the inlet end of the second branch from the exhaust port of the compressor 1, the risk of the high refrigerant temperature drawn into the compressor 1 through the air inlet being adversely affected by the efficiency, power consumption and service life of the compressor 1 can be reduced.

[0068] Of course, the decision on whether to deliver the throttled refrigerant to the compressor 1's inlet via the first branch, i.e., whether to activate the enthalpy-increasing function, can also be further determined by considering factors such as the compressor 1's exhaust temperature, compressor 1's exhaust superheat, compressor 1's frequency, and the ambient temperature of the air conditioning system's indoor heat exchanger 12 during operation. For example, if the compressor 1's exhaust temperature is higher than the fourth preset value and / or the compressor 1's exhaust superheat is higher than the fifth preset value, and the ambient temperature of the air conditioning system is lower than the first preset value, the first branch delivers the throttled refrigerant from the main heat exchange circuit to the compressor 1's inlet, connecting the inlet of the second branch to the compressor 1's exhaust port; if the compressor 1's exhaust temperature is higher than the second preset value and / or the compressor 1's exhaust superheat is higher than the third preset value, the inlet of the second branch is disconnected from the compressor 1's exhaust port, where the second preset value is greater than the fourth preset value, and the third preset value is greater than the fifth preset value.

[0069] The computer-readable storage medium provided in the embodiments of this disclosure stores control instructions, which, when executed by a processor, implement the control method of the air conditioning system provided in the embodiments of this disclosure.

[0070] The computer-readable storage medium provided in the embodiments of this disclosure can be used to implement the control method of the air conditioning system provided in the embodiments of this disclosure, and therefore has the advantages of the air conditioning system and control method of the embodiments of this disclosure.

[0071] The air conditioning system control device provided in the embodiments of this disclosure includes a memory and a processor coupled to the memory, the processor being configured to implement the air conditioning system control method provided in the embodiments of this disclosure based on instructions stored in the memory.

[0072] The control device for the air conditioning system provided in the embodiments of this disclosure can be used to implement the control method for the air conditioning system provided in the embodiments of this disclosure, and therefore has the advantages of the air conditioning system and control method of the embodiments of this disclosure.

[0073] The following is combined Figure 1 and Figure 2 The present disclosure further describes an air conditioning system and its control method according to some embodiments.

[0074] The air conditioning system includes a compressor 1, an outdoor heat exchanger 4, a throttling device, an indoor heat exchanger 12, a second branch circuit, and a first heat exchanger 9.

[0075] The compressor 1, outdoor heat exchanger 4, throttling device, and indoor heat exchanger 12 are connected via refrigerant piping to form a main heat exchange circuit. Multiple indoor heat exchangers 12 are connected in parallel. The throttling device includes a first throttling device 6 and multiple second throttling devices 13 corresponding to the multiple indoor heat exchangers 12.

[0076] The air conditioning system also includes an oil separator 2, a reversing valve 3, a refrigerant heat dissipation module 5, a gas-liquid separator 7, and a second heat exchanger 11, all located in the main heat exchange circuit.

[0077] The reversing valve 3 is a four-way valve. The first port of the four-way valve is connected to the discharge port of the compressor 1, the second port is connected to multiple indoor heat exchangers 12, the third port is connected to the suction port of the compressor 1, and the fourth port is connected to the outdoor heat exchanger 4. The four-way valve has a first operating state and a second operating state. In the first operating state, the first port and the fourth port are connected, and the second port and the third port are connected; in the second operating state, the first port and the second port are connected, and the third port and the fourth port are connected.

[0078] Oil separator 2 is installed in the refrigerant line between the discharge port of compressor 1 and the first oil port of the four-way valve. Refrigerant heat dissipation module 5 is installed in the refrigerant line between the first throttling component 6 and the second heat exchanger 11. Gas-liquid separator 7 is installed in the refrigerant line between the air inlet of compressor 1 and the third oil port of the four-way valve.

[0079] The inlet of the first branch is optionally connected to the main heat exchange circuit and is configured to deliver refrigerant throttled by the throttling device in the main heat exchange circuit to the gas supply port of compressor 1. The inlet of the first branch is connected to the refrigerant pipeline of the main heat exchange circuit between the first throttling device 6 and the second throttling device 13, and the outlet is connected to the gas supply port of compressor 1. A first control valve 10 is provided in the first branch and is configured to control the connection or disconnection of the inlet and outlet of the first branch.

[0080] The inlet of the second branch can be selectively connected to the exhaust port of compressor 1, and the outlet is connected to the refrigerant line between the second heat exchanger 11 and the second throttling component 13. A second control valve 8 is provided in the second branch and is configured to control the connection or disconnection of the inlet and outlet of the second branch.

[0081] The first heat exchanger 9 is located at the inlet end of the second branch. The first branch and the second branch are thermally coupled through the first heat exchanger 9. The refrigerant pipeline between the indoor heat exchanger 12 and the inlet end of the first branch is thermally coupled to the first branch through the second heat exchanger 11.

[0082] When the air conditioning system is in cooling mode and the ambient temperature is lower than the first preset temperature, the first control valve 10 controls the connection of the inlet and outlet of the first branch, and the second control valve 8 controls the connection of the inlet and outlet of the second branch. At this time, the refrigerant in the main heat exchange circuit circulates sequentially along the compressor 1, oil separator 2, reversing valve 3, outdoor heat exchanger 4, first throttling component 6, refrigerant heat dissipation module 5, second heat exchanger 11, second throttling component 13, indoor heat exchanger 12, reversing valve 3, and gas-liquid separator 7. In addition, the first branch delivers the throttled refrigerant to the gas inlet of the compressor 1, and a portion of the higher-temperature gaseous refrigerant discharged from the exhaust port of the compressor 1 enters the second branch and exchanges heat with the refrigerant in the first branch.

[0083] When the air conditioning system is in heating mode and the ambient temperature is lower than the first preset temperature, the first control valve 10 controls the connection of the inlet and outlet of the first branch, and the second control valve 8 controls the connection of the inlet and outlet of the second branch. At this time, the refrigerant in the main heat exchange circuit circulates sequentially along the compressor 1, oil separator 2, reversing valve 3, indoor heat exchanger 12, second throttling component 13, second heat exchanger 11, refrigerant heat dissipation module 5, first throttling component 6, outdoor heat exchanger 4, reversing valve 3, and gas-liquid separator 7. In addition, the first branch delivers the throttled refrigerant to the air inlet of the compressor 1, and a portion of the higher-temperature gaseous refrigerant discharged from the exhaust port of the compressor 1 enters the second branch and exchanges heat with the refrigerant in the first branch.

[0084] During the operation of the air conditioning system, if at least one of the following conditions is met: the exhaust temperature of compressor 1 is greater than the second preset value and the exhaust superheat of compressor 1 is greater than the third preset value, the inlet and outlet of the second branch are connected by the second control valve 8, so that the inlet of the second branch is disconnected from the exhaust port of compressor 1.

[0085] In some embodiments, the control device described above may be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described herein.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and not to limit them; although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this disclosure or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this disclosure.

Claims

1. An air conditioning system, characterized in that, include: The compressor (1), outdoor heat exchanger (4), throttling device and indoor heat exchanger (12) are connected by refrigerant pipelines to form the main heat exchange circuit. The first branch, with its inlet end optionally connected to the main heat exchange circuit, is configured to deliver the refrigerant in the main heat exchange circuit that has been throttled by the throttling component to the gas supply port of the compressor (1). The second branch, the inlet end of which may be connected to the exhaust port of the compressor (1); and The first heat exchanger (9) and the second branch are thermally coupled to the first branch through the first heat exchanger (9) so that the gaseous refrigerant discharged by the compressor (1) can transfer heat to the refrigerant in the first branch.

2. The air conditioning system according to claim 1, characterized in that, The first heat exchanger (9) is located at the inlet end of the second branch.

3. The air conditioning system according to claim 1, characterized in that, It also includes a second heat exchanger (11), and the refrigerant pipeline between the indoor heat exchanger (12) and the inlet end of the first branch is thermally coupled to the first branch through the second heat exchanger (11) so that the refrigerant pipeline between the indoor heat exchanger (12) and the inlet end of the first branch can transfer heat to the refrigerant in the first branch.

4. The air conditioning system according to claim 3, characterized in that, The outlet end of the second branch is connected to the refrigerant pipeline between the indoor heat exchanger (12) and the second heat exchanger (11).

5. The air conditioning system according to any one of claims 1 to 4, characterized in that, The air conditioning system has a first operating mode and a second operating mode. In the first working mode, the inlet end of the first branch is connected to the air supply port of the compressor (1), and the inlet end of the second branch is connected to the exhaust port of the compressor (1). In the second working mode, the inlet end of the first branch is connected to the air supply port of the compressor (1), and the inlet end of the second branch is disconnected from the exhaust port of the compressor (1).

6. The air conditioning system according to claim 5, characterized in that, include: A first control valve (10) is configured to connect or disconnect the inlet and outlet ends of the first branch, thereby controlling the connection or disconnection between the inlet end of the first branch and the air supply port of the compressor (1); and / or The second control valve (8) is configured to control the connection or disconnection of the inlet and outlet of the second branch, so as to control the connection or disconnection of the inlet of the second branch with the exhaust port of the compressor (1).

7. The air conditioning system according to claim 5, characterized in that, The system includes a reversing valve (3) and multiple throttling components, including a first throttling component (6) and a second throttling component (13). The reversing valve (3) is located in the main heat exchange circuit and has a first working state and a second working state. In the first working state, the compressor (1), the outdoor heat exchanger (4), the first throttling component (6), the inlet end of the first branch, and the indoor heat exchanger (12) are arranged sequentially along the refrigerant flow direction. In the second working state, the compressor (1), the indoor heat exchanger (12), the second throttling component (13), the inlet end of the first branch, and the outdoor heat exchanger (4) are arranged sequentially along the refrigerant flow direction.

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