Air conditioning system and control method and control device thereof

Abstract

The invention provides an air conditioning system and a control method and device thereof. 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. The control method comprises the steps that if the environment temperature is lower than a first preset value, the first branch conveys a throttled refrigerant in the main heat exchange loop to an air supply port of the compressor, the inlet end of the second branch communicates with an exhaust port of the compressor, and therefore the gaseous refrigerant exhausted by the compressor transfers heat to the refrigerant in the first branch. According to the technical scheme, the liquid return problem of the compressor under the limiting working condition can be solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to an air conditioning system and a control method and a control device thereof. Background Art

[0002] At present, the enthalpy increase method in the refrigeration system is more suitable for conventional working conditions. However, under extreme working conditions such as ultra-low temperature refrigeration and ultra-low temperature heating, the heat absorbed by the refrigerant in the enthalpy increase circuit after throttling is small, which will make the quality of the refrigerant in this branch circuit poor. Most of them enter the compressor in the form of pure liquid or gas-liquid two-phase state, resulting in liquid return problems in the compressor under extreme working conditions. Liquid return will not only cause liquid hammer, but also dilute the lubricating oil and cause wear. When worn, the load and current of the motor will increase greatly, which will cause motor failure over time; and the exhaust temperature of the compressor will drop sharply, resulting in challenges to the reliability of the compressor itself. Summary of the invention

[0003] The purpose of the present disclosure is to provide an air conditioning system and a control method and a control device thereof, so as to improve the liquid return problem of the compressor under extreme working conditions.

[0004] A first aspect of the present disclosure provides an air conditioning system, comprising:

[0005] A compressor, an outdoor heat exchanger, a throttling component and an indoor heat exchanger are connected to form a main heat exchange circuit through a refrigerant pipeline;

[0006] A first branch, the inlet end of which is selectively connected to the main heat exchange circuit, is configured to transport the refrigerant in the main heat exchange circuit throttled by the throttling component to the air supply port of the compressor;

[0007] A second branch, the inlet end of which is selectively connected to the exhaust port of the compressor; and

[0008] The second branch is thermally coupled to the first branch through the first heat exchanger, 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 disposed at an inlet end of the second branch.

[0010] In some embodiments of the air-conditioning system, a second heat exchanger is further included, and the refrigerant pipeline 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 pipeline 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 the air conditioning system of some embodiments, the outlet end of the second branch is connected to the refrigerant pipeline 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 working mode and a second working mode.

[0013] In the first working 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 working 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, the air conditioning system includes:

[0016] a first control valve configured to control the connection or disconnection between the inlet end and the outlet end of the first branch, so as to control the connection or disconnection between the inlet end of the first branch and the air supply port of the compressor; and / or

[0017] The second control valve is configured to control the connection or disconnection between the inlet end and the outlet end of the second branch, so as to control 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 a plurality of throttling components are included, wherein the plurality of throttling components include a first throttling component and a second throttling component. The reversing valve is arranged in the main heat exchange circuit and has a first working state and a second working state. In the first working 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 in sequence along the flow direction of the refrigerant. In the second working 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 in sequence along the flow direction of the refrigerant.

[0019] The second aspect of the present disclosure provides a control method for an air-conditioning system according to the first aspect of the present disclosure, comprising: if the ambient temperature of the air-conditioning system is lower than a first preset value, the first branch transports the throttled refrigerant in the main heat exchange circuit 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, so that the gaseous refrigerant discharged from the compressor transfers heat to the refrigerant in the first branch.

[0020] In some embodiments of the control method of the air-conditioning system, it 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, the inlet end of the second branch is disconnected from the exhaust port of the compressor.

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

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

[0023] Memory; and

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

[0025] Considering the problem of poor quality of the refrigerant in the first branch under extremely low temperature conditions, in the air-conditioning system provided by the present disclosure, the second branch can draw out a gaseous refrigerant with a higher temperature from the exhaust port of the compressor, and thermally couple with the first branch through the first heat exchanger. The refrigerant in the second branch exchanges heat with the refrigerant in the first branch, so that the temperature of the refrigerant in the first branch can be increased before entering the compressor, and it can be completely evaporated into a gaseous state, thereby improving the quality of the refrigerant entering the compressor and reducing the risk of liquid return in the compressor. It can be seen that the air-conditioning system provided by the present disclosure can improve the liquid return problem of the compressor under extreme conditions, thereby improving the reliability and service life of the compressor.

[0026] In the control method of the air-conditioning system provided by the present invention, the first preset value is used to determine whether the ambient temperature is in a 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 turn on the enthalpy increase function, but also the refrigerant temperature in the first branch is low. At this time, by connecting the inlet end of the second branch with 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, thereby improving the liquid return problem of the compressor under extreme working conditions.

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

[0028] The control device of the air-conditioning system provided in the present disclosure can be used to implement the control method of the air-conditioning system provided in the embodiment of the present disclosure, and thus has the advantages of the air-conditioning system and the control method thereof provided in the present disclosure.

[0029] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0031] Figure 1 The present invention is a schematic diagram of the working principle of the air conditioning system of some embodiments of the present invention.

[0032] Figure 2 Schematic diagram of the working principle of the air-conditioning system of other embodiments of the present disclosure.

[0033] In the accompanying drawings, each reference numeral represents:

[0034] 1. Compressor; 2. Oil separator; 3. Reversing valve; 4. Outdoor heat exchanger; 5. Refrigerant cooling 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 DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present disclosure. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, these technologies, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0037] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0038] In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words 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 cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

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

[0040] refer to Figure 1 and Figure 2 The air conditioning system provided by the embodiment of the present 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] The compressor 1, the outdoor heat exchanger 4, the throttling component and the indoor heat exchanger 12 are connected through a refrigerant pipeline to form a main heat exchange circuit. The inlet end of the first branch can be selectively connected to the main heat exchange circuit, and is configured to transport the refrigerant throttled by the throttling component in the main heat exchange circuit to the air supply port of the compressor 1. The inlet end of the second branch can be selectively connected to the exhaust port of the 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 the 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 component includes a first throttling component 6. Optionally, the air conditioning system includes an indoor heat exchanger 12 or multiple indoor heat exchangers 12 arranged in parallel, and the throttling component includes a second throttling component 13 corresponding to the indoor heat exchanger 12 or multiple second throttling components 13 corresponding to the multiple indoor heat exchangers 12 arranged in parallel. Optionally, refer to Figure 1 and Figure 2 The air conditioning system includes a plurality of indoor heat exchangers 12 arranged in parallel, and the throttling component includes a first throttling component 6 and a plurality of second throttling components 13 arranged corresponding to the plurality of indoor heat exchangers 12 . Figure 1The dotted arrow in the figure shows the flow direction of the refrigerant when the air-conditioning system of some embodiments of the present disclosure cools the indoor room. During cooling, the first branch can selectively transport the refrigerant throttled by the first throttling component 6 to the air supply port of the compressor 1. Figure 2 The solid arrow in the figure shows the flow direction of the refrigerant when the air conditioning system of some embodiments of the present disclosure heats the room. When heating, the first branch can selectively deliver the 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 end of the first branch can be connected to the medium-pressure chamber of compressor 1 through the air supply port of compressor 1, thereby eliminating a process from the low-pressure chamber to the medium-pressure chamber of compressor 1, reducing the work done by compressor 1; and, setting the first branch can increase the amount of refrigerant in the air-conditioning system and improve the heat exchange capacity of the refrigerant in the system. Under normal ambient temperature conditions, the first branch can play a role in increasing enthalpy, which is very beneficial to the enhancement of the refrigeration capacity of the entire refrigeration system. However, for some extreme working conditions, such as conditions where the environment is at extremely low temperatures, the refrigerant drawn from the heat exchange circuit by the first branch is difficult to carry enough heat, and the refrigerant in the first branch is of poor quality, mostly existing in the form of pure liquid or gas-liquid two-phase state, resulting in the risk of liquid return to compressor 1.

[0044] Taking into account the problem of poor quality of the refrigerant in the first branch under extremely low temperature conditions, in the air-conditioning system provided by the embodiment of the present disclosure, the second branch can draw out a gaseous refrigerant with a higher temperature from the exhaust port of the compressor 1, and thermally couple with the first branch through the first heat exchanger 9. The refrigerant in the second branch exchanges heat with the refrigerant in the first branch, which can increase the temperature of the refrigerant in the first branch before entering the compressor 1 and completely evaporate into a gaseous state, thereby improving the quality of the refrigerant entering the compressor 1 and reducing the risk of liquid return in the compressor 1. It can be seen that the air-conditioning system provided by the embodiment of the present disclosure can improve the liquid return problem of the compressor under extreme conditions, thereby improving the reliability and service life of the compressor.

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

[0046] In the air-conditioning system of this embodiment, since the first heat exchanger 9 is arranged at the inlet end of the second branch, the heat loss before the heat exchange between the refrigerant in the second branch and 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 between the two.

[0047] In some embodiments of the air-conditioning system, a second heat exchanger 11 is further included, and 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 arranged 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 firstly pass through the second heat exchanger 11 to exchange heat with the refrigerant in the refrigerant pipeline at the corresponding position of the heat exchange circuit, and then pass through the first heat exchanger 9 to exchange heat with the refrigerant in the second branch, 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 the air conditioning system of some embodiments, 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 .

[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 the air conditioning system of this embodiment, the refrigerant in the second branch can return to the main heat exchange circuit after exchanging heat with the refrigerant in the first branch, so as to realize the recycling of the refrigerant. The inlet end of the second branch is set at a position close to the exhaust port of the compressor 1, which is conducive to the extraction of high-temperature and high-pressure gaseous refrigerant; the outlet end of the second branch is set at a position that can make the temperature and state of the refrigerant discharged from the second branch similar to the refrigerant at the corresponding position in the main heat exchange circuit, so as to achieve the purpose of improving 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 the air-conditioning system of the present embodiment, when the ambient temperature is extremely low, the air-conditioning system can be placed in the first working mode, and the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 can be diverted through the second branch to improve the quality of the refrigerant in the first branch, thereby achieving compressor suction enthalpy increase through the refrigerant in the first branch; and when the compressor exhaust 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 air supply port of the compressor 1 through the first branch to be too high, then the air-conditioning system can be placed in the second working mode, and the heating of the refrigerant in the first branch can be stopped to 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 control the inlet and outlet ends of the first branch to be connected or disconnected, so as to control the inlet end of the first branch to be connected or disconnected with the air supply port of the compressor 1. The second control valve 8 is configured to control the inlet and outlet ends of the second branch to be connected or disconnected, so as to control the inlet end of the second branch to be connected or disconnected with the exhaust port of the compressor 1.

[0056] Optionally, the first control valve 10 and the second control valve 8 are solenoid valves with an on-off control function. The first control valve 10 and the second control valve 8 may also be control valves with a flow rate adjustment function, so as to flexibly adjust the on-off state of both ends of the first branch and the second branch and the flow rate of the refrigerant in the first branch and the second branch according to the actual working conditions of the air-conditioning system.

[0057] In the air-conditioning system of the present embodiment, by setting a first control valve 10, the inlet end of the first branch can be controlled to be connected or disconnected with the air supply port of the compressor 1, thereby determining whether to turn on the enthalpy increase function according to the actual working condition of the air-conditioning system; by setting a second control valve 8, the inlet end of the second branch can be controlled to be connected or disconnected with the exhaust port of the compressor 1, thereby determining whether to draw out a higher temperature refrigerant through the second branch to heat the lower temperature refrigerant in the first branch according to the actual working condition of the air-conditioning system.

[0058] In some embodiments of the air-conditioning system, a reversing valve 3 and a plurality of throttling components are included, the plurality of throttling components include a first throttling component 6 and a second throttling component 13, the reversing valve 3 is arranged 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 in sequence along the flow direction of the refrigerant, and 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 in sequence along the flow direction of the refrigerant.

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

[0060] Optionally, refer to Figure 1 and Figure 2 The air conditioning system further comprises an oil separator 2, which is arranged in the refrigerant pipeline between the exhaust port of the compressor 1 and the first oil port of the four-way valve. Figure 1 and Figure 2 The air conditioning system further comprises a refrigerant heat dissipation module 5, which is arranged in the refrigerant pipeline between the first throttling component 6 and the inlet end of the first branch. Figure 1 and Figure 2 The air conditioning system further includes a gas-liquid separator 7, which is arranged 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 In the direction of the dotted arrow, in the air-conditioning system of this embodiment, when the reversing valve 3 is in the first working state, the refrigerant circulates in the heat exchange circuit along the compressor 1, the outdoor heat exchanger 4, the first throttling component 6, the indoor heat exchanger 12 and the compressor 1 in sequence, and the air-conditioning system cools the room. At this time, the outdoor heat exchanger 4 is a condenser and the indoor heat exchanger 12 is 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 end of the first branch is also correspondingly low, and the heat carried is insufficient. The purpose of improving the quality of the refrigerant in the first branch can be achieved by heating the second branch.

[0062] refer to Figure 2 In the direction of the solid arrow, in the air-conditioning system of this embodiment, when the reversing valve 3 is in the second working state, the refrigerant circulates in the heat exchange circuit along the compressor 1, the indoor heat exchanger 12, the second throttling component 13, the outdoor heat exchanger 4 and the compressor 1 in sequence, and the air-conditioning system heats the room. At this time, the indoor heat exchanger 12 is a condenser and the outdoor heat exchanger 4 is an evaporator. When the ambient temperature is extremely low, the evaporation temperature of the outdoor heat exchanger 4 is low, and the temperature of the refrigerant at the inlet end of the first branch is also correspondingly low, and the heat carried is insufficient. The purpose of improving the quality of the refrigerant in the first branch can be achieved by heating the second branch.

[0063] The control method of the air-conditioning system provided in the embodiment of the present disclosure includes: if the ambient temperature of the air-conditioning system is lower than a first preset value, the first branch transports the throttled refrigerant in the main heat exchange circuit 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, so that the gaseous refrigerant discharged from 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 the compressor 1 by changing the on-off state of the first control valve 10 mentioned above; the inlet end of the second branch can be connected to the exhaust port of the 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 embodiment of the present disclosure, the first preset value is used to determine whether the ambient temperature is in a 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 turn on the enthalpy increase function, but also the refrigerant temperature in the first branch is low. At this time, by connecting the inlet end of the second branch with 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, thereby improving the liquid return problem of the compressor under extreme working conditions.

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

[0067] In the control method of the air-conditioning system provided in the present embodiment, the second preset value and the third preset value are used to determine whether the exhaust temperature of the compressor 1 is in a 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 higher than the third preset value, it indicates that the exhaust temperature of the compressor 1 is relatively high. The heat exchange between the second branch and the first branch may cause the refrigerant temperature in the first branch to be relatively high, and then cause the refrigerant temperature sucked in by the compressor 1 through the air supply port to be relatively 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 temperature of the refrigerant sucked in by the compressor 1 through the air supply port having an adverse effect on the efficiency, power consumption and service life of the compressor 1 can be reduced.

[0068] Of course, it is also possible to further combine the exhaust temperature of the compressor 1, the exhaust superheat of the compressor 1, the frequency of the compressor 1, the temperature of the indoor space where the indoor heat exchanger 12 is located when the air-conditioning system is running, and other factors to determine whether to transport the throttled refrigerant to the air supply port of the compressor 1 through the first branch, that is, whether to turn on the enthalpy increase function. For example, if the exhaust temperature of the compressor 1 is higher than the fourth preset value and / or the exhaust superheat of the compressor 1 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 transports the throttled refrigerant in the main heat exchange circuit to the air supply port of the compressor 1, so that the inlet end of the second branch is connected to the exhaust port of the compressor 1; if the exhaust temperature of the compressor 1 is higher than the second preset value and / or the exhaust superheat of the compressor 1 is higher than the third preset value, the inlet end of the second branch is disconnected from the exhaust port of the compressor 1, wherein 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 embodiment of the present disclosure stores control instructions, and when the control instructions are executed by a processor, the control method of the air-conditioning system provided in the embodiment of the present disclosure is implemented.

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

[0071] The control device of the air-conditioning system provided by the embodiment of the present disclosure includes a memory and a processor coupled to the memory, and the processor is configured to implement the control method of the air-conditioning system provided by the embodiment of the present disclosure based on instructions stored in the memory.

[0072] The control device of the air-conditioning system provided in the embodiment of the present disclosure can be used to implement the control method of the air-conditioning system provided in the embodiment of the present disclosure, and thus has the advantages of the air-conditioning system and the control method thereof in the embodiment of the present disclosure.

[0073] Combine the following Figure 1 and Figure 2 The air conditioning system and control method thereof according to some embodiments of the present disclosure are further described.

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

[0075] The compressor 1, the outdoor heat exchanger 4, the throttling component, and the indoor heat exchanger 12 are connected through a refrigerant pipeline to form a main heat exchange circuit. The multiple indoor heat exchangers 12 are connected in parallel. The throttling component includes a first throttling component 6 arranged at and multiple second throttling components 13 arranged corresponding to the multiple indoor heat exchangers 12.

[0076] The air conditioning system further 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 which are arranged in the main heat exchange circuit.

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

[0078] The oil separator 2 is arranged in the refrigerant pipeline between the exhaust port of the compressor 1 and the first oil port of the four-way valve. The refrigerant heat dissipation module 5 is arranged in the refrigerant pipeline between the first throttling component 6 and the second heat exchanger 11. The gas-liquid separator 7 is arranged in the refrigerant pipeline between the air inlet of the compressor 1 and the third oil port of the four-way valve.

[0079] The inlet end of the first branch can be selectively connected to the main heat exchange circuit, and is configured to transport the refrigerant throttled by the throttling component in the main heat exchange circuit to the air supply port of the compressor 1. The inlet end of the first branch is connected to the refrigerant pipeline of the main heat exchange circuit between the first throttling component 6 and the second throttling component 13, and the outlet end is connected to the air supply port of the compressor 1. The first control valve 10 is provided on the first branch, and is configured to control the connection or disconnection of the inlet end and the outlet end of the first branch.

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

[0081] The first heat exchanger 9 is disposed 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 with 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 inlet and outlet of the first branch are connected by the first control valve 10, and the inlet and outlet of the second branch are connected by the second control valve 8. At this time, the refrigerant in the main heat exchange circuit circulates in the direction of the compressor 1, the oil separator 2, the reversing valve 3, the outdoor heat exchanger 4, the first throttling component 6, the refrigerant heat dissipation module 5, the second heat exchanger 11, the second throttling component 13, the indoor heat exchanger 12, the reversing valve 3, and the gas-liquid separator 7 in sequence, and the first branch transports the throttled refrigerant to the air supply port of the compressor 1, and a part of the gaseous refrigerant with a higher temperature 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 inlet and outlet of the first branch are connected by the first control valve 10, and the inlet and outlet of the second branch are connected by the second control valve 8. At this time, the refrigerant in the main heat exchange circuit circulates in the direction of the compressor 1, the oil separator 2, the reversing valve 3, the indoor heat exchanger 12, the second throttling component 13, the second heat exchanger 11, the refrigerant heat dissipation module 5, the first throttling component 6, the outdoor heat exchanger 4, the reversing valve 3, and the gas-liquid separator 7 in sequence, and the first branch transports the throttled refrigerant to the air supply port of the compressor 1, and a part 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 two conditions that the exhaust temperature of compressor 1 is greater than the second preset value and the exhaust superheat of compressor 1 is higher than the third preset value is met, the inlet and outlet ends of the second branch are connected through the second control valve 8, so that the inlet end of the second branch is disconnected from the exhaust port of compressor 1.

[0085] In some embodiments, the control device described above can 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 appropriate combination thereof for performing the functions described in the present disclosure.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution for protection requested by the present disclosure.

Claims

1. An air conditioning system, characterized in that: include: A compressor (1), an outdoor heat exchanger (4), a throttling component and an indoor heat exchanger (12) are connected via a refrigerant pipeline to form a main heat exchange circuit; A first branch, the inlet end of which can be selectively connected to the main heat exchange circuit, is configured to transport the refrigerant in the main heat exchange circuit throttled by the throttling component to the air supply port of the compressor (1); A second branch, the inlet end of which is selectively connected to the exhaust port of the compressor (1); and A first heat exchanger (9), wherein the second branch is thermally coupled to the first branch through the first heat exchanger (9), so that the gaseous refrigerant discharged from 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 arranged 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 working mode and a second working 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) configured to control the connection or disconnection between the inlet end and the outlet end of the first branch, so as to control 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 between the inlet end and the outlet end of the second branch, so as to control the connection or disconnection between the inlet end of the second branch and the exhaust port of the compressor (1).

7. The air conditioning system according to claim 5, characterized in that: It includes a reversing valve (3) and a plurality of throttling components, wherein the plurality of throttling components include a first throttling component (6) and a second throttling component (13). The reversing valve (3) is arranged 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 in sequence along the flow direction of the refrigerant. 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 in sequence along the flow direction of the refrigerant.

8. A control method for an air conditioning system according to any one of claims 1 to 7, characterized in that: include: If the ambient temperature of the air-conditioning system is lower than a first preset value, the first branch transports the throttled refrigerant in the main heat exchange circuit 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), so that the gaseous refrigerant discharged from the compressor (1) transfers heat to the refrigerant in the first branch.

9. The control method of the air conditioning system according to claim 8, characterized in that: include: If the exhaust temperature of the compressor (1) is higher than a second preset value and / or the exhaust superheat of the compressor (1) is higher than a third preset value, the inlet end of the second branch is disconnected from the exhaust port of the compressor (1).

10. A computer-readable storage medium having control instructions stored thereon, wherein the control instructions implement the control method according to claim 8 or 9 when executed by a processor.

11. A control device for an air conditioning system, characterized in that: include: Memory; and A processor is coupled to the memory, and the processor is configured to implement the control method according to claim 8 or 9 based on instructions stored in the memory.

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