WO2021169541A1

WO2021169541A1 - Air conditioning system and control method therefor

Info

Publication number: WO2021169541A1
Application number: PCT/CN2020/139031
Authority: WO
Inventors: 谭建明; 刘华; 熊建国; 张仕强; 李立民; 邱天
Original assignee: 珠海格力电器股份有限公司
Priority date: 2019-10-23
Filing date: 2020-12-24
Publication date: 2021-09-02
Also published as: CN111102773A; CN211739591U; CN111102774A; CN111102774B; CN111102772B; CN111102772A; WO2021169539A1; CN211739589U; WO2021169542A1; CN211876449U; CN211739590U; CN211739592U; CN211739588U; CN111121353A; CN111102770A; CN111288694A; CN111102771A; CN110645745A

Abstract

An air conditioning system and a control method therefor. The air conditioning system comprises: a compressor (1), an indoor heat exchanger, a subcooler (8), an outdoor heat exchanger (5), and a gas-liquid separator (13) that are connected in sequence; a gas-liquid separator branch, one end of which is connected to an outlet of the gas-liquid separator (13), and the other end of which is connected to a suction port of the compressor (1); a first branch, one end of which is connected to the subcooler (8), and the other end of which is connected to the suction port and/or an air supplementing port of the compressor (1), and which is used for sending a gaseous refrigerant at the subcooler (8) into the compressor (1); and a liquid storage tank branch, one end of which is connected to an outlet of a liquid storage tank, and the other end of which is connected to the suction port and/or the air supplementing port of the compressor (1), and which is used for sending the gaseous refrigerant in the liquid storage tank into the compressor (1).

Description

Air conditioning system and its control method

Cross-references to related applications

This application is based on the application with the CN application number 202010120879.9 and the filing date of February 26, 2020, and claims its priority. The disclosure of the CN application is hereby incorporated into this application as a whole.

Technical field

The present disclosure relates to the field of air conditioning technology, and in particular, to an air conditioning system and a control method thereof.

Background technique

The supplementary air or suction of the compressor is generally that each branch converges to the same place (such as the air separation), and then enters the compressor.

However, the respective pressures of the refrigerant in each branch before entering the gas are not consistent. If liquid refrigerant is mixed in it, the evaporation temperature of the liquid refrigerant under each pressure is also different, and it will affect the overall heat transfer effect after converging in one place. .

Aiming at the problem that the supplementary air or suction air of the compressor in the technology known to the inventor can only pass through the gas-liquid separator, which affects the heat exchange effect, no effective solution has been proposed at present.

Summary of the invention

The present disclosure provides an air conditioning system and a control method thereof, so as to at least solve the problem that the supplementary air or suction of the compressor in the technology known by the inventor can only pass through the gas-liquid separator, which affects the heat exchange effect.

To solve the above technical problems, according to one aspect of the embodiments of the present disclosure, an air conditioning system is provided, including: a compressor 1, an indoor heat exchanger, a subcooler 8, an outdoor heat exchanger 5, and a gas-liquid separator connected in sequence 13; The gas-liquid separator branch, one end is connected to the outlet of the gas-liquid separator 13, the other end is connected to the suction port of the compressor 1; the first branch, one end is connected to the subcooler 8, the other end is connected to the compressor At least one of the suction port and the air supply port of 1 is connected to send the gaseous refrigerant at the subcooler 8 into the compressor 1; the branch of the liquid storage tank, one end is connected with the outlet of the liquid storage tank, and the other end is connected with At least one of the suction port and the supplemental port of the compressor 1 is connected to send the gaseous refrigerant in the liquid storage tank to the compressor 1.

In some embodiments, the air conditioning system further includes: a first heating device 21 located on the first branch and used for heating the refrigerant in the first branch.

In some embodiments, the air conditioning system further includes at least one of a first suction valve (17) and a first supplementary valve (23), wherein: the first suction valve 17 is located from the first branch to the compressor 1. Between the suction ports of the first branch and the suction port of the compressor 1, or when connected with the suction port and the supplementary air port of the compressor 1, to control the delivery of the gaseous refrigerant at the subcooler 8 Into the suction port of the compressor 1; the first supplement valve 23, located between the first branch and the supplement port of the compressor 1, is used to connect the first branch to the supplement port of the compressor 1, or, with the compression When the suction port of the machine 1 is connected to the supplementary gas port, the gaseous refrigerant at the subcooler 8 is controlled to be sent to the supplementary gas port of the compressor 1.

In some embodiments, the liquid storage tank is located below the gas-liquid separator 13 and is connected to the gas-liquid separator 13 through a liquid inlet valve for storing the refrigerant separated by the gas-liquid separator 13.

In some embodiments, the air conditioning system further includes: a second heating device 18, located at the lower part of the liquid storage tank, for heating the liquid storage tank and generating gaseous refrigerant.

In some embodiments, the air conditioning system further includes at least one of a second suction valve (19) and a second supplementary valve (22), wherein: the second suction valve 19 is located at the outlet of the liquid storage tank to the compressor Between the suction ports of 1, it is used to control the gaseous refrigerant in the liquid storage tank when the liquid storage tank is connected to the suction port of the compressor 1, or when it is connected to the suction port and the supplementary air port of the compressor 1. The suction port of the compressor 1; the second air supplement valve 22, located between the outlet of the liquid storage tank and the air supplement port of the compressor 1, is used to connect the liquid storage tank and the air supply port of the compressor 1, or, with the compressor When the air suction port of 1 is connected to the air supply port, the gas refrigerant in the liquid storage tank is controlled to be sent to the air supply port of the compressor 1.

In some embodiments, the air conditioning system further includes: a pressure balance valve, located between the outlet of the gas-liquid separator 13 and the liquid storage tank, for balancing the pressure between the gas-liquid separator 13 and the liquid storage tank.

In some embodiments, the air conditioning system further includes: a hot gas bypass branch, one end is connected to the outlet of the compressor 1, and the other end is connected to the pipeline between the subcooler 8 and the outdoor heat exchanger 5, which is used in the chemical industry. During frosting, part of the refrigerant discharged from the compressor 1 is passed into the outdoor heat exchanger 5 for defrosting; the defrosting solenoid valve 6 is located on the hot gas bypass branch and is used to control the opening of the hot gas bypass branch during defrosting.

According to another aspect of the embodiments of the present disclosure, there is provided a control method of an air conditioning system, applied to the above air conditioning system, including: detecting whether the compressor of the air conditioning system needs to increase enthalpy; when the compressor needs to increase enthalpy, controlling the first The branch circuit and the branch circuit of the liquid storage tank are connected with the air supply port of the compressor; when the compressor does not need to increase the enthalpy, the first branch circuit and the branch circuit of the liquid storage tank are controlled to be connected with the suction port of the compressor.

In some embodiments, controlling the first branch and the liquid storage tank branch to be connected to the suction port of the compressor includes: controlling the opening of the first suction valve 17 and the second suction valve 19, and controlling the first supplemental gas The valve 23 and the second air supplement valve 22 are closed; the first suction valve 17 is located between the first branch and the suction port of the compressor 1, and the second suction valve 19 is located between the outlet of the liquid storage tank and the compressor 1. Between the intake ports of 1, the first supplement valve 23 is located between the first branch and the supplement port of the compressor 1, and the second supplement valve 22 is located between the outlet of the liquid storage tank and the supplement port of the compressor 1. .

In some embodiments, controlling the first branch and the liquid storage tank branch to connect to the air supply port of the compressor includes: controlling the first air supply valve 23 and the second air supply valve 22 to open, and controlling the first air intake valve 17 and the second suction valve 19 are closed; wherein, the first supplement valve 23 is located between the first branch and the supplement port of the compressor 1, and the second supplement valve 22 is located at the outlet of the liquid storage tank to the compressor 1 Between the air supply ports, the first suction valve 17 is located between the first branch and the suction port of the compressor 1, and the second suction valve 19 is located between the outlet of the liquid storage tank and the suction port of the compressor 1.

According to still another aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the control method described in any of the foregoing embodiments is implemented.

According to still another aspect of the embodiments of the present disclosure, there is provided a control device for an air conditioning system, including: a memory; and a processor coupled to the memory, the processor being configured to be stored in the memory device based on To execute the control method described in any of the above embodiments.

In this disclosure, a new continuous heating and air-conditioning system is proposed, so that the refrigerants in multiple parts of the system enter the compressor after heat exchange and evaporation at their respective pressures, and each does not affect each other. The above solution effectively solves the problem of poor heat exchange effect caused by the compressor's air intake only passing through the gas-liquid separator, and achieves the most excellent heat exchange effect.

Description of the drawings

Fig. 1 is a schematic structural diagram of an air conditioning system according to some embodiments of the present disclosure;

Fig. 2 is a flowchart of a control method of an air conditioning system according to some embodiments of the present disclosure;

Figure 3 is a schematic diagram of the flow of refrigerant in an air conditioning system according to some embodiments of the present disclosure;

Figure 4 is a block diagram of a control device according to some embodiments of the present disclosure.

Detailed ways

The exemplary embodiments will be described in detail here, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

In some embodiments of the present disclosure, an air conditioning system is provided. Specifically, FIG. 1 shows a schematic structural diagram of some embodiments of the system. As shown in FIG. 1, the system includes:

Compressor 1, indoor heat exchanger, subcooler 8, outdoor heat exchanger 5 and gas-liquid separator 13 connected in sequence;

A branch of the gas-liquid separator, one end is connected with the outlet of the gas-liquid separator (13), and the other end is connected with the suction port of the compressor (1);

The first branch, one end is connected to the subcooler 8, and the other end is respectively connected to at least one of the air supply port and the suction port of the compressor 1, and is used to send the gaseous refrigerant at the subcooler (8) into the subcooler (8). The compressor (1). In some embodiments, the first branch is also used to supplement air and increase the enthalpy of the compressor 1 during defrosting.

The compressor can suck gaseous refrigerant from at least three locations, including the refrigerant at the gas division, the refrigerant evaporated at the first heating device, and the refrigerant evaporated at the second heating device. Therefore, the gaseous refrigerant produced in the three places can have different evaporation pressures. For example, the pressure of the refrigerant in the gas component is consistent with the pressure in the outdoor heat exchanger, and the gaseous refrigerant is generated by absorbing heat in the outdoor heat exchanger; the first heating device and The second heating device is not connected to the gas, and the pressure is different. They absorb the heat generated by the electric heating and evaporate to produce a gaseous refrigerant; the heat exchange of the three does not affect each other.

In the above-mentioned embodiment, a new continuous heating and air-conditioning system is proposed, so that the refrigerants in multiple parts of the system enter the compressor after heat exchange and evaporation at their respective pressures, and each does not affect each other. The above solution effectively solves the problem of poor heat exchange effect caused by the compressor's air intake only passing through the gas-liquid separator, and achieves the most excellent heat exchange effect.

In order to ensure that the refrigerant entering the compressor is in a gaseous state, the system further includes: a first heating device 21, located on the first branch, for heating the refrigerant in the first branch. At least one electric heating component is added to the system to provide a heat source for the system, so that the condensed refrigerant evaporates into a gaseous state and then returns to the compressor 1.

A first suction valve 17 and a first supplementary valve 23 are also provided on the first branch. As shown in FIG. 1, the first suction valve 17 is located between the first branch and the suction port of the compressor 1. It is used to control the supply of gaseous refrigerant from the subcooler 8 to the compressor 1 when the first branch is connected to the suction port of the compressor 1, or when it is connected to the suction port and the supplementary air port of the compressor 1. Inhale. The first air supply valve 23 is located between the first branch and the air supply port of the compressor 1, and is used to connect the first branch to the air supply port of the compressor 1, or to the suction port and the air supply port of the compressor 1 When connected, control the gaseous refrigerant at the subcooler 8 to be sent to the supplementary air port of the compressor 1.

In some embodiments, the liquid storage tank is located below the gas-liquid separator 13 and is connected to the gas-liquid separator 13 through a liquid inlet valve for storing the refrigerant separated by the gas-liquid separator 13. The lower part of the liquid storage tank also includes a second heating device 18 for heating the liquid storage tank to generate gaseous refrigerant. The heating device can realize that the refrigerant entering the compressor is in a gaseous state. In this way, in the embodiment of the present disclosure, the intake air can be realized as a gaseous refrigerant without being connected to the compressor through a gas-liquid separator, so as to prevent the occurrence of phenomena such as liquid hammer.

In some embodiments, the system further includes: a second suction valve 19, located between the outlet of the liquid storage tank and the suction port of the compressor 1, for connecting the liquid storage tank and the suction port of the compressor 1, or , When connected with the suction port and the supplementary air port of the compressor 1, the gaseous refrigerant in the liquid storage tank is controlled to be sent to the suction port of the compressor 1. In other embodiments, the system further includes: a second air supplement valve 22, located between the outlet of the liquid storage tank and the air supplement port of the compressor 1, for connecting the liquid storage tank and the air supplement port of the compressor 1, or, When connected with the suction port and the supplementary gas port of the compressor 1, the gaseous refrigerant in the liquid storage tank is controlled to be sent to the supplementary gas port of the compressor 1.

In addition to the above-mentioned air supplement and air intake methods, the system also includes: a pressure balance valve, located between the outlet of the gas-liquid separator 13 and the liquid storage tank, used to balance the pressure between the gas-liquid separator 13 and the liquid storage tank .

In some embodiments, the system further includes: a hot gas bypass branch, one end is connected to the outlet of the compressor 1, and the other end is connected to the pipeline between the subcooler 8 and the outdoor heat exchanger 5, which is used in the chemical industry. When frosting, part of the refrigerant discharged from the compressor 1 is passed into the outdoor heat exchanger 5 for defrosting.

In some embodiments, the air conditioning system further includes: an oil separator 2 and a four-way valve 4 located between the compressor 1 and the indoor heat exchanger.

In some embodiments, during defrosting, the four-way valve 4 is in the power-on state, that is, the system is in heating mode, and the four-way valve 4 passes part of the refrigerant discharged from the oil separator 2 into the indoor heat exchanger for heating . In other words, part of the high-temperature and high-pressure refrigerant discharged from the compressor 1 through the oil separator 2 enters the four-way valve 4, and then enters the indoor heat exchanger for heating, and the other part enters the hot gas bypass branch, and then enters the outdoor heat exchanger. In 5, perform defrosting. Therefore, in the embodiments of the present disclosure, through the arrangement of the above-mentioned structure, the effect of defrosting and heating can be realized at the same time. In addition, an air supplement and enthalpy increase branch is used to supplement air and increase enthalpy during defrosting, which improves the heat exchange effect of the system, so that the heating effect is not lost, and has a better heating effect than the prior art.

In order to control the hot gas bypass branch, a defrosting solenoid valve 6 is also provided, which is located on the hot gas bypass branch, and is used to control the opening of the hot gas bypass branch during defrosting.

In the above embodiment, a new continuous heating and air-conditioning system is proposed. Due to the use of the hot gas bypass branch, the high-temperature and high-pressure refrigerant discharged from the compressor can be directly defrosted at the same time to the outdoor heat exchanger for defrosting. Heating with indoor heat exchangers. At the same time, an air supplement and enthalpy increase branch is used to supplement air and increase enthalpy during defrosting to improve the heat exchange effect of the system. Through the above method, the problem of insufficient continuous and efficient indoor mechanism heat during defrosting of the air conditioner is effectively solved. The four-way valve does not switch during defrosting, and the heating capacity is not attenuated, and the defrosting is fast, which improves the effect and efficiency of defrosting. .

The system is equipped with at least three suction ports. As shown in Figure 1, the compressor 1 can suck gaseous refrigerant from at least three places, including the refrigerant at the gas division, the refrigerant evaporated at the first heating device 21, and the second The refrigerant evaporated at the heating device 18. Therefore, the gaseous refrigerants produced in the three places can have different evaporation pressures. For example, the refrigerant in the gas component is consistent with the pressure in the outdoor heat exchanger 5. The gaseous refrigerant is generated by absorbing heat in the outdoor heat exchanger 5. The heating device 21 and the second heating device 18 are not connected to the gas and have different pressures. They absorb the heat generated by electric heating and evaporate to produce gaseous refrigerant, and the three heat exchanges do not affect each other, so that the refrigerant is fully under their respective pressures. For heat exchange, the opening and closing of each related branch can be controlled by the suction valve, the air supply valve, etc.

Due to the use of hot gas bypass and gas heating technology, the high temperature and high pressure refrigerant exhausted during defrosting can be directly sent to the outdoor heat exchanger 5 for defrosting and indoor heat exchanger heating, and the condensed refrigerant is heated and evaporated , Sent to the compressor, can maintain the heating capacity without attenuation, and at the same time achieve a good defrosting effect.

In some embodiments of the present disclosure, a control method of an air conditioning system is also provided, and the control method can be directly applied to the air conditioning system in any of the foregoing embodiments. Specifically, FIG. 2 shows a flowchart of this method in some embodiments. As shown in Figure 2, the method includes the following steps S202-S206:

S202: Detect whether the compressor of the air conditioning system needs to increase enthalpy;

S204: When the compressor needs to increase the enthalpy, control the first branch and the liquid storage tank branch to be connected to the air supply port of the compressor;

S206: When the compressor does not need to increase the enthalpy, control the first branch and the liquid storage tank branch to be connected to the suction port of the compressor.

In the above embodiments, a new continuous heating and air-conditioning system is proposed, which adopts multi-low pressure system control, so that the refrigerants in multiple parts of the system enter the compressor after heat exchange and evaporation at their respective pressures, and each does not affect each other. The above solution effectively solves the problem of poor heat exchange effect caused by the compressor's air intake only passing through the gas-liquid separator, and achieves the most excellent heat exchange effect.

In the above embodiment, the temperature is used to detect whether the compressor of the air conditioning system needs to increase enthalpy. If the temperature is too low, it means that the compressor needs to add air to increase the enthalpy. At this time, control the first branch and the liquid storage tank branch and compression The air supply port connection of the machine includes: controlling the first air supply valve 23 and the second air supply valve 22 to open, and controlling the first air intake valve 17 and the second air intake valve 19 to close.

When there is no need to increase enthalpy, controlling the first branch and the liquid storage tank branch to connect to the suction port of the compressor includes: controlling the opening of the first suction valve 17 and the second suction valve 19, and controlling the first compensation The air valve 23 and the second supplemental air valve 22 are closed.

As shown in Figure 3, the first suction valve 17 is located between the first branch and the suction port of the compressor 1, and the second suction valve 19 is located between the outlet of the liquid storage tank and the suction port of the compressor 1. The first air supplement valve 23 is located between the first branch and the air supplement port of the compressor 1, and the second air supplement valve 22 is located between the outlet of the liquid storage tank and the air supplement port of the compressor 1.

Since the system has multiple air intake ports and multiple air supplement ports at the same time, it enriches the system's air intake and air supplement enthalpy adjustment methods. In addition to the existing traditional methods of supplementing air and increasing enthalpy, the system of the present disclosure can inhale and supplement the enthalpy from the exhaust of each heating device. When the unit needs to increase enthalpy, open the first supplement valve 23, the second supplement valve 22, close the first suction valve 17, the second suction valve 19; when the unit does not need to increase the enthalpy, it needs to be closed The first air supplement valve 23 and the second air supplement valve 22 open the first air inlet valve 17 and the second air inlet valve 19.

Based on the control method of the air-conditioning system provided by the above-mentioned embodiments, in some embodiments of the present disclosure, a storage medium containing computer-executable instructions is also provided. When the computer-executable instructions are executed by a computer processor, they are used to execute such The above-mentioned air conditioning system control method.

The control method and control device of the present disclosure may be implemented in many ways. For example, the control method and control device of the present disclosure can be implemented by software, hardware, firmware or any combination of software, hardware, and firmware. The above-mentioned order of the steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above, unless specifically stated otherwise. In addition, in some embodiments, the present disclosure can also be implemented as programs recorded in a recording medium, and these programs include machine-readable instructions for implementing the method according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure. The present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transitory storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

Figure 4 shows a block diagram of a control device according to some embodiments of the present disclosure.

As shown in FIG. 4, the control device includes a memory 410 and a processor 420 coupled to the memory 410. The processor 420 is configured to execute the control method in any one of the foregoing embodiments based on instructions stored in the memory 410.

The memory 410 may include, for example, a system memory, a fixed non-volatile storage medium, and the like. The system memory stores, for example, an operating system, an application program, a boot loader (Boot Loader), and other programs.

The control device may also include an input/output interface 430, a network interface 440, a storage interface 450, and the like. These

interfaces

430, 440, 450 and the memory 410 and the processor 420 may be connected via a bus 460, for example. Among them, the input/output interface 430 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 440 provides a connection interface for various networked devices. The storage interface 450 provides a connection interface for external storage devices such as SD cards and U disks.

Those skilled in the art will easily think of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptive changes of the present disclosure. These variations, uses, or adaptive changes follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not invented by the present disclosure. . The description and the embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are pointed out by the following claims.

It should be understood that the present disclosure is not limited to the precise structure that has been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

An air conditioning system, including:

Compressor (1), indoor heat exchanger, subcooler (8), outdoor heat exchanger (5) and gas-liquid separator (13) connected in sequence;

A branch of the gas-liquid separator, one end is connected with the outlet of the gas-liquid separator (13), and the other end is connected with the suction port of the compressor (1);

The first branch, one end is connected to the subcooler (8), and the other end is connected to at least one of the suction port and the supplementary air port of the compressor (1) for connecting the subcooler (8) The gaseous refrigerant at) is fed into the compressor (1); and

The liquid storage tank branch, one end is connected with the outlet of the liquid storage tank, and the other end is connected with at least one of the suction port and the air supplement port of the compressor (1), and is used to connect the gaseous refrigerant in the liquid storage tank It is sent to the compressor (1).
The air conditioning system according to claim 1, further comprising:

The first heating device (21) is located on the first branch and is used for heating the refrigerant in the first branch.
The air conditioning system according to claim 1, further comprising at least one of a first suction valve (17) and a first supplementary valve (23), wherein:

The first suction valve (17) is located between the first branch and the suction port of the compressor (1) for connecting the first branch to the compressor (1) The suction port, or, when connected with the air supply port and the suction port of the compressor (1), controls the gaseous refrigerant at the subcooler (8) to be sent to the suction of the compressor (1) mouth;

The first air supply valve (23) is located between the first branch and the air supply port of the compressor (1), and is used for supplying air between the first branch and the compressor (1). The air port, or, when connected with the air supply port and the air suction port of the compressor (1), controls to send the gaseous refrigerant at the subcooler (8) to the air supply port of the compressor (1).
The air conditioning system according to claim 1, wherein the liquid storage tank is located below the gas-liquid separator (13) and is connected to the gas-liquid separator (13) through a liquid inlet valve for storing The refrigerant separated by the gas-liquid separator (13).
The air conditioning system according to claim 1, further comprising:

The second heating device (18) is located at the lower part of the liquid storage tank and is used for heating the liquid storage tank to generate gaseous refrigerant.
The air conditioning system according to claim 5, further comprising at least one of a second air intake valve (19) and a second air supplement valve (22), wherein:

The second suction valve (19) is located between the outlet of the liquid storage tank and the suction port of the compressor (1) for connecting the liquid storage tank and the compressor (1) The suction port, or, when connected with the air supply port and the suction port of the compressor (1), control to send the gaseous refrigerant in the liquid storage tank to the suction port of the compressor (1);

The second air supplement valve (22) is located between the outlet of the liquid storage tank and the air supplement port of the compressor (1), and is used for supplementing the liquid storage tank and the compressor (1). The air port, or, when connected with the air supply port and the air suction port of the compressor (1), controls to send the gaseous refrigerant in the liquid storage tank to the air supply port of the compressor (1).
The air conditioning system according to claim 4, further comprising: a pressure balance valve, located between the outlet of the gas-liquid separator (13) and the liquid storage tank, for balancing the gas-liquid separator (13) And the pressure between the liquid storage tank.
The air conditioning system according to claim 1, further comprising:

The hot gas bypass branch, one end is connected to the outlet of the compressor (1), and the other end is connected to the pipeline between the subcooler (8) and the outdoor heat exchanger (5) for During defrosting, part of the refrigerant discharged from the compressor (1) is passed into the outdoor heat exchanger (5) for defrosting; and

The defrosting solenoid valve (6) is located on the hot gas bypass branch and is used to control the opening of the hot gas bypass branch during defrosting.
The air conditioning system according to claim 8, further comprising:

The oil separator (2) and the four-way valve (4) are located between the compressor (1) and the indoor heat exchanger,

Among them, part of the high temperature and high pressure refrigerant discharged from the compressor (1) through the oil separator (2) enters the four-way valve (4), and then enters the indoor heat exchanger for heating, and the other part enters the hot gas bypass branch, and then enters In the outdoor heat exchanger (5), defrosting is performed.
A control method of an air-conditioning system, applied to the air-conditioning system according to any one of claims 1-9, the control method comprising:

Detecting whether the compressor of the air conditioning system needs to increase enthalpy;

When the compressor needs to increase the enthalpy, controlling the first branch and the liquid storage tank branch to be connected to the air supply port of the compressor;

When the compressor does not need to increase the enthalpy, the first branch and the liquid storage tank branch are controlled to be connected to the suction port of the compressor.
The control method according to claim 10, wherein controlling the connection of the first branch and the liquid storage tank branch with the suction port of the compressor comprises:

Control the first suction valve (17) and the second suction valve (19) to open, and control the first supplement valve (23) and the second supplement valve (22) to close, wherein the first suction valve (17) Located between the first branch and the suction port of the compressor (1), the second suction valve (19) is located at the outlet of the liquid storage tank to the compressor (1) Between the suction ports, the first air supplement valve (23) is located between the first branch and the air supplement port of the compressor (1), and the second air supplement valve (22) is located at the Between the outlet of the liquid storage tank and the air supply port of the compressor (1).
The control method according to claim 10, wherein controlling the first branch and the liquid storage tank branch to be connected to the air supply port of the compressor comprises:

The first supplemental air valve (23) and the second supplemental valve (22) are controlled to be opened, and the first suction valve (17) and the second suction valve (19) are controlled to be closed, wherein the first supplementary valve (23) Located between the first branch and the air supply port of the compressor (1), the second air supply valve (22) is located at the outlet of the liquid storage tank to the compressor (1) The first suction valve (17) is located between the first branch and the suction port of the compressor (1), and the second suction valve (19) is located at the storage Between the outlet of the liquid tank and the suction port of the compressor (1).
The control method according to claim 10, further comprising:

During defrosting, the four-way valve (4) is controlled to be in the power-on state, so that part of the high-temperature and high-pressure refrigerant discharged from the compressor (1) through the oil separator (2) enters the four-way valve (4), and then enters the indoor heat exchanger. For heating, the other part enters the hot gas bypass branch, and then enters the outdoor heat exchanger (5) for defrosting,

Among them, the oil separator (2) and the four-way valve (4) are located between the compressor (1) and the indoor heat exchanger.
A computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the control method according to any one of claims 10 to 13 is realized.
A control device of an air-conditioning system includes:

Memory; and

A processor coupled to the memory, and the processor is configured to execute the control method according to any one of claims 10 to 13 based on instructions stored in the memory device.