WO2020224014A1

WO2020224014A1 - Air-conditioning system

Info

Publication number: WO2020224014A1
Application number: PCT/CN2019/088552
Authority: WO
Inventors: 刘畅; 林华和
Original assignee: 维谛技术有限公司
Priority date: 2019-05-05
Filing date: 2019-05-27
Publication date: 2020-11-12
Also published as: CN111895671A

Abstract

An air-conditioning system (1), comprising an outdoor unit (2) and an indoor unit (3) sequentially arranged in a direction from high to low, wherein the outdoor unit (2) comprises a condenser, and the indoor unit (3) comprises an expansion valve. The air-conditioning system (1) further comprises a pressure reduction module (5) arranged between the condenser and the expansion valve. The condenser, the pressure reduction module (5) and the expansion valve are sequentially connected by means of a liquid pipeline (4), and the pressure reduction module (5) is used for adjusting the flow of condensate in the liquid pipeline (4), so as to control upstream pressure borne by the expansion valve to be within a safe pressure range. The expansion valve of the air-conditioning system (1) has a relatively long service life, and therefore, the air conditioning system (1) works relatively reliably.

Description

An air conditioning system

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on May 5, 2019, with the application number 201910367211.1 and the invention title of "An Air Conditioning System", the entire content of which is incorporated into this application by reference.

Technical field

The invention relates to the technical field of heat dissipation equipment, in particular to an air conditioning system.

Background technique

Computer room air conditioners are used to dissipate heat for data center equipment, and generally require uninterrupted operation throughout the year, which has very high requirements for reliability. There are many factors that affect the reliability of the air conditioning in the computer room. The on-site engineering installation environment is one of the important factors. The height difference between indoor and outdoor unit installation is an important aspect of the engineering installation environment. When the computer room air conditioner is installed with a positive drop, that is, when the outdoor unit (condenser) is at a high place and the indoor unit (expansion valve, evaporator, compressor, etc.) is at a low place, the pressure-bearing capacity of the system is often challenged. This is because the expansion valve, evaporator, and compressor of the computer room air conditioner are all in the indoor unit. When a positive drop occurs, the liquid refrigerant at the condenser outlet will flow down through the liquid pipe to the lower expansion valve for throttling. Previously, the pressure of the liquid refrigerant in the liquid pipe due to gravity will be superimposed on the expansion valve in the indoor unit and the liquid pipe before it, which means that all the refrigeration components in this part, including the filter dryer, sight glass, ball valve The pressure of the liquid refrigerant will be much higher than the condensing pressure of the system.

Although the pressure before the expansion valve can be controlled below the safe working pressure by restricting the engineering installation environment, it also limits the application scenarios of the air-cooled computer room air conditioning system. In recent years, data center computer rooms have developed rapidly. There are more and more computer rooms of various forms, and many computer rooms need to be built in cities. In order to deal with the noise nuisance caused by the air conditioner in the computer room in the city, the outdoor unit condenser is usually placed on the top floor platform, which will cause a large positive drop. At present, for the ultra-high positive drop scenario exceeding 50m, the heat exchange method of water-cooled plate is usually used to solve the problem. However, the water-cooling solution requires water to enter the computer room and also a cooling tower system. These systems consume a lot of water and also The addition of water pumps and other components has increased the failure rate of the air conditioning system.

Summary of the invention

The purpose of the embodiments of the present invention is to provide an air conditioning system to improve the reliability of the air conditioning system.

The air conditioning system provided by the embodiment of the present invention includes: an outdoor unit and an indoor unit arranged in a direction from high to low, the outdoor unit includes a condenser, the indoor unit includes an expansion valve, and the air conditioning system further includes A decompression module arranged between the condenser and the expansion valve, wherein: the condenser, the decompression module, and the expansion valve are sequentially connected by a liquid pipeline, and the decompression module is used for regulating The flow rate of condensate in the liquid pipeline.

In the embodiment of the present invention, optionally, the pressure reducing module is a capillary tube, and the capillary tube is arranged at the outlet of the condenser.

In any embodiment of the present invention, optionally, the air conditioning system further includes a pressure detection module provided between the pressure reducing module and the expansion valve, and the pressure detection module is used to detect the expansion valve The inlet pressure.

In the embodiment of the present invention, optionally, the decompression module includes a solenoid valve and a capillary tube arranged in parallel, and the decompression module is disposed at the outlet of the condenser; the air conditioning system further includes a control module, The control module is used to control the solenoid valve to close when the pressure value detected by the pressure detection module is greater than the set pressure value; when the pressure value detected by the pressure detection module is less than the set pressure value, control the The solenoid valve opens.

In any embodiment of the present invention, optionally, the air conditioning system further includes a control module configured to control the decompression when the pressure value detected by the pressure detection module is greater than the set pressure value The module reduces the flow of condensate in the liquid pipeline; when the pressure value detected by the pressure detection module is less than a set pressure value, the pressure reducing module is controlled to increase the flow of condensate in the liquid pipeline.

In the embodiment of the present invention, optionally, the control module is further configured to stop working when the pressure value detected by the pressure detection module is a target pressure value and the flow of condensate in the liquid pipeline is the maximum.

In any embodiment of the present invention, optionally, the pressure reducing module is arranged at the outlet of the condenser; or the pressure reducing module is arranged at the inlet of the expansion valve.

In the embodiment of the present invention, optionally, the pressure reducing module is an electromagnetic pressure reducing valve or an electronic expansion valve.

In any embodiment of the present invention, optionally, the indoor unit further includes a compressor, and the air conditioning system further includes a gas pipeline connecting the condenser and the compressor, and the gas pipeline is provided with an oil return bend.

In the embodiment of the present invention, optionally, the air conditioning system further includes an oil separator arranged between the condenser and the compressor, the condenser, the oil separator, and the compressor Connect sequentially through the gas pipeline.

In the air-conditioning system of the present technical solution, since the outdoor unit and the indoor unit are set at a certain height difference, the air-conditioning system installs a decompression module between the expansion valve of the indoor unit and the condenser of the outdoor unit to connect the expansion valve The flow rate of the condensate in the liquid pipeline of the condenser is adjusted to adjust the pressure of the refrigerant in the liquid pipeline.

Compared with the prior art, the air conditioning system of this technical solution can adjust the flow of condensate in the liquid pipeline according to the height difference between the outdoor unit and the indoor unit, so as to adjust the pressure at the inlet of the expansion valve to reduce The inlet pressure of the expansion valve is controlled within the safe pressure range, thereby making the air conditioning system work more reliable.

Based on the same inventive concept, this application also provides a pressure control method applied to an air conditioning system, the method including:

Obtain the pressure value detected by the pressure detection module;

Compare the pressure value detected by the acquired pressure detection module with the set pressure value;

When the pressure value detected by the pressure detection module is greater than the set pressure value, the control solenoid valve is closed; when the pressure value detected by the pressure detection module is less than the set pressure value, the control solenoid valve is opened.

The pressure control method of the air conditioning system adopts the technical solution, by setting the pressure reducing module as a solenoid valve and capillary tube connected in parallel, and positioning the solenoid valve in the main circuit where the refrigerant flows, and the capillary tube acts as a bypass. In this way, first obtain the pressure value detected by the pressure detection module, and compare the obtained pressure value detected by the pressure detection module with the set pressure value. When the pressure detection module detects that the pressure before the expansion valve is low, the control solenoid valve is kept open State, the refrigerant in the liquid pipeline of the air-conditioning system flows through the main circuit of the solenoid valve and does not flow through the capillary bypass, and does not undergo a pressure reduction process. When the pressure detection module detects that the pressure before the expansion valve is higher than a certain limit, the solenoid valve is controlled to close, so that the refrigerant in the liquid pipeline flows through the capillary bypass for throttling to reduce the refrigerant pressure. This solution has a feedback loop, which can use capillary to reduce pressure when necessary, so as to realize real-time adjustment of the pressure before the valve of the expansion valve, so that the operation of the expansion valve is more reliable, thereby improving the reliability and safety of the air conditioning system .

Obtain the pressure value detected by the pressure detection module;

When the pressure value detected by the pressure detection module is greater than the set pressure value, the pressure reduction module is controlled to reduce the flow of condensate in the liquid pipeline; when the pressure value detected by the pressure detection module is less than the set pressure value, the pressure reduction is controlled The module increases the flow of condensate in the liquid pipeline.

The pressure control method of the air conditioning system adopts the technical solution, wherein the pressure reducing module can be used to adjust the flow of condensate in the liquid pipeline. In this way, by first obtaining the pressure value detected by the pressure detection module, and comparing the obtained pressure value detected by the pressure detection module with the set pressure value, according to the pressure value detected by the pressure detection module before the valve is greater than the set pressure value When the pressure-reducing module is controlled to act to reduce the flow of condensate in the liquid pipe, the pressure before the valve of the expansion valve is reduced below the set pressure value; when the pressure value detected by the pressure detection module is less than the set pressure value When the pressure reducing module is controlled to increase the flow of the condensate in the liquid pipeline, the pressure before the valve of the expansion valve is always the set pressure, so that the operation of the expansion valve is relatively stable.

In any embodiment of the present invention, optionally, the method further includes:

Compare the pressure value detected by the pressure detection module with the target pressure value;

When the pressure value detected by the pressure detection module is the target pressure value, and the flow of the condensate in the liquid pipe is the maximum, the control is exited.

In this way, the conditions for exiting the pressure control state of the air conditioning system can be judged by the opening of the solenoid pressure reducing valve and the current valve front pressure of the expansion valve, which can effectively prevent the pressure control state of the control module from exiting prematurely, thereby Make the system pressure more stable.

Description of the drawings

Figure 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;

Figure 2 is a schematic structural diagram of an air conditioning system according to another embodiment of the present invention;

Figure 3 is a schematic structural diagram of an air conditioning system according to another embodiment of the present invention;

4 is a schematic structural diagram of an air conditioning system according to another embodiment of the present invention;

FIG. 5 is a schematic diagram of the pressure adjustment control logic of an air conditioning system according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of a pressure adjustment control logic of an air conditioning system according to another embodiment of the present invention;

FIG. 7 is a flowchart of a pressure control method of an air conditioning system according to an embodiment of the present invention;

Fig. 8 is a flowchart of a pressure control method of an air conditioning system according to another embodiment of the present invention.

Reference signs:

1- Air conditioning system;

2- Outdoor unit;

3- Indoor unit;

4- Liquid pipeline;

5- Decompression module;

501-capillary;

502-solenoid valve;

6-Pressure detection module;

7-Control module;

8-Gas pipeline;

801-oil return bend.

Detailed ways

In order to improve the reliability of the air conditioning system, an embodiment of the present invention provides an air conditioning system. In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following examples will further illustrate the present invention in detail.

When this application mentions ordinal numbers such as "first", "second", "third" or "fourth", unless they actually express the meaning of the order based on the context, it should be understood as merely for distinguishing purposes.

As shown in Figures 1 to 6, an embodiment of the present invention provides an air conditioning system 1, including: an outdoor unit 2 and an indoor unit 3 arranged in a direction from high to low. The outdoor unit 2 includes a condenser (not shown in the figure). (Shown), the indoor unit 3 includes an expansion valve (not shown in the figure), and the air conditioning system 1 also includes a decompression module 5 arranged between the condenser and the expansion valve, wherein: the condenser, the decompression module 5 and the expansion valve The liquid pipe 4 is connected in sequence, and the pressure reducing module 5 is used to adjust the flow of condensate in the liquid pipe 4.

In the embodiments of this technical solution, the inlet pressure of the expansion valve is referred to as the pressure before the valve.

The air conditioning system 1 of this technical solution can be specifically a data center computer room air conditioning system. Since the outdoor unit 2 and the indoor unit 3 are arranged at a certain height difference, the air conditioning system 1 passes through the expansion valve of the indoor unit 3 and the condenser of the outdoor unit 2. A decompression module 5 is arranged in between to adjust the flow of condensate in the liquid pipe 4 connecting the expansion valve and the condenser, so as to adjust the pressure of the refrigerant in the liquid pipe 4. It is worth mentioning that the pressure reducing module 5 can be selected according to the height difference set between the indoor unit 3 and the outdoor unit 2, so as to meet the adjustment of the valve front pressure of the indoor unit 3 under various height differences, and it has a wide range of applications. .

Compared with the prior art, the air-conditioning system 1 of this technical solution can adjust the flow of condensate in the liquid pipe 4 according to the height difference between the outdoor unit 2 and the indoor unit 3, thereby adjusting the pressure before the valve of the expansion valve. Adjust to control the front pressure of the expansion valve within the safety pressure range. In this way, the service life of the expansion valve is longer, and the air conditioning system 1 can work more reliably.

As shown in FIG. 1, in the embodiment of the present invention, optionally, the decompression module 5 is a capillary tube 501, and the capillary tube 501 is arranged at the outlet of the condenser.

By setting a capillary tube 501 at the outlet of the condenser as the decompression module 5, the capillary tube 501 can be selected according to the height difference between the indoor unit 3 and the outdoor unit 2, and the pressure requirements of the expansion valve before the valve, so as to expand The front pressure of the valve is always within the safe pressure range, and the expansion valve has better working stability.

As shown in Figures 2 to 4, in any embodiment of the present invention, optionally, the air conditioning system 1 further includes a pressure detection module 6 arranged between the pressure reducing module 5 and the expansion valve, and the pressure detection module 6 is used for Check the inlet pressure of the expansion valve.

By setting the pressure detection module 6, the pressure in front of the expansion valve can be monitored in real time, so that the pressure reducing module 5 can adjust the flow of condensate in the liquid pipeline 4 according to the detected pressure in front of the valve, so that the pressure in front of the valve can be adjusted. Always within the safe pressure range. Among them, the pressure detection module 6 may be a pressure sensor or a simple pressure switch.

As shown in Figure 2, in the embodiment of the present invention, optionally, the decompression module 5 includes a solenoid valve 502 and a capillary tube 501 arranged in parallel, and the decompression module 5 is disposed at the outlet of the condenser; the air conditioning system 1 also includes The control module 7, the control module 7 is used to control the solenoid valve 502 to close when the pressure value detected by the pressure detection module 6 is greater than the set pressure value; when the pressure value detected by the pressure detection module 6 is less than the set pressure value, control the solenoid valve 502 is turned on.

The decompression module 5 is set as a solenoid valve 502 and a capillary 501 connected in parallel, and the solenoid valve 502 is located in the main circuit where the refrigerant flows, and the capillary 501 serves as a bypass. In this way, when the pressure detection module 6 detects that the pressure before the expansion valve is low, the control module 7 keeps the solenoid valve 502 open, and the refrigerant in the liquid pipe 4 of the air conditioning system 1 flows through the main circuit of the solenoid valve 502 instead of the capillary tube 501 bypass, no step-down process. When the pressure detection module 6 detects that the pressure before the expansion valve is higher than a certain limit, the control module 7 closes the solenoid valve 502, so that the refrigerant in the liquid pipe 4 bypasses the capillary 501 for throttling to reduce the refrigerant pressure. This solution has a feedback loop, and the capillary 501 can be used to reduce the pressure when necessary, so as to realize the real-time adjustment of the pressure in front of the expansion valve by the control module 7 to make the expansion valve work more reliable.

5, in another alternative embodiment of the present invention, the control module 7 of the air-conditioning system 1 is used to control the pressure reducing module 5 to make the liquid pipe flow when the pressure value detected by the pressure detecting module 6 is greater than the set pressure value The flow of the condensate decreases; when the pressure value detected by the pressure detection module 6 is less than the set pressure value, the decompression module 5 is controlled to increase the flow of the condensate in the liquid pipe 5.

In this embodiment, the pressure reducing module 5 may be an electromagnetic pressure reducing valve or an electronic expansion valve. Taking the pressure reducing module 5 as an electromagnetic pressure reducing valve as an example, the control module 7 is connected to the electromagnetic pressure reducing valve and the pressure detecting module 6 at the same time. In this way, when the pressure value before the valve detected by the pressure detection module 6 is greater than the set pressure value, the control module 7 controls the action of the electromagnetic pressure reducing valve to reduce the flow of condensate in the liquid pipeline, thereby making the valve of the expansion valve The front pressure drops below the set pressure value; when the pressure value detected by the pressure detection module 6 is less than the set pressure value, the decompression module 5 is controlled to increase the flow of condensate in the liquid pipe 4, thereby making the expansion valve valve The front pressure is always the set pressure to make the expansion valve work more stable.

The air conditioning system 1 adopting this technical solution can flexibly control the valve front pressure of the expansion valve, and simply solve the pressure problem encountered by the expansion valve front device in the positive drop application scenario, and can limit the positive drop of the air conditioning system from Increase from 50m to 100m or even higher.

As shown in Figures 2 to 4, in any embodiment of the present invention, the decompression module 5 can be arranged in multiple positions. Optionally, the decompression module 5 is provided at the outlet of the condenser; or the decompression module 5 Set at the entrance of the expansion valve.

As shown in Figures 1 to 3, in the embodiments shown in Figures 1 to 3, the decompression module 5 is arranged at the outlet of the condenser, that is, at the height of the positive drop, so that the decompression module 5 itself does not need to bear The pressure brought by the height difference liquid column, so the pressure-bearing capacity of the pressure reducing module 5 is relatively low.

In the embodiment shown in FIG. 4, the decompression module 5 is arranged at the entrance of the expansion valve, that is, the decompression module 5 is arranged close to the pressure detection module 6. At this time, the decompression module 5 is located at the positive drop of the air conditioning system 4. Low. In this solution, the decompression module 5 is placed at a higher pressure, which can prevent the refrigerant from flashing in the liquid pipeline 4 when the decompression module 5 is working, and the control module 7, the decompression module 5, and the pressure detection module 6 are all separated from each other. The indoor unit 3 is very close, which is convenient for wiring and maintenance.

Further, referring to FIGS. 3, 4, and 6, in the embodiment of the present invention, optionally, the control module 7 is also used for when the pressure value detected by the pressure detection module 6 is the target pressure value, and condensation in the liquid pipe 4 Stop working when the flow of liquid is at its maximum.

Still taking the pressure reducing module 5 as an electromagnetic pressure reducing valve as an example, the control logic flow chart of the control module 7 to the electromagnetic pressure reducing valve can be shown in FIG. 6. In this way, the conditions for exiting the pressure control state of the air conditioning system 4 can be judged by the opening of the solenoid pressure reducing valve and the current valve front pressure of the expansion valve. For example, "control the solenoid pressure reducing valve to adjust the valve front pressure of the expansion valve, And set a target pressure", so that when the pressure in front of the valve is greater than or less than the target pressure, the control module 7 starts control; only when the pressure in front of the valve is equal to the target pressure and the flow of condensate in the liquid pipe 4 is maximum, The control module 7 stops controlling. This step can be realized by PID (Proportion Integration Differentiation) control, or by other control methods such as two-position control. The above-mentioned pressure control exit judgment condition can effectively avoid the premature exit of the pressure control state of the control module 7, so that the system pressure is relatively stable.

1 to 4, in any embodiment of the present invention, optionally, the indoor unit 3 further includes a compressor (not shown in the figure), and the air conditioning system 1 further includes a gas pipeline 8 connecting the condenser and the compressor , The gas pipeline 8 is provided with an oil return bend 801.

By arranging the oil return bend 801 on the gas pipeline 8, the problem of difficulty in oil return of the air conditioning system 1 with a large drop between the indoor unit 3 and the outdoor unit 2 can be effectively improved, thereby helping to improve the working reliability of the air conditioning system 1.

Further, in the embodiment of the present invention, an oil separator (not shown in the figure) may be provided between the condenser and the compressor of the air conditioning system 1, and the condenser, the oil separator, and the compressor pass through the gas pipeline 8 Connections. Wherein, an oil separator and an oil return bend 801 can be provided on the gas pipeline 8 at the same time, or an oil separator can be used alone, which can further improve the oil return capability of the air conditioning system, thereby further enhancing the reliability of the air conditioning system.

As shown in Fig. 7, based on the same inventive concept, the present application also provides a pressure control method applied to an air conditioning system. The method includes:

Step 001: Obtain the pressure value detected by the pressure detection module;

Step 002: Compare the acquired pressure value detected by the pressure detection module with the set pressure value;

Step 003: When the pressure value detected by the pressure detection module is greater than the set pressure value, the control solenoid valve is closed; when the pressure value detected by the pressure detection module is less than the set pressure value, the control solenoid valve is opened.

The pressure control method of the air-conditioning system adopts the technical solution, by setting the pressure reducing module as a solenoid valve and capillary in parallel, and placing the solenoid valve in the main circuit where the refrigerant flows, and the capillary is used as a bypass. In this way, first obtain the pressure value detected by the pressure detection module, and compare the obtained pressure value detected by the pressure detection module with the set pressure value. When the pressure detection module detects that the pressure before the expansion valve is low, the control solenoid valve is kept open State, the refrigerant in the liquid pipeline of the air-conditioning system flows through the main circuit of the solenoid valve and does not flow through the capillary bypass, and does not undergo a pressure reduction process. When the pressure detection module detects that the pressure before the expansion valve is higher than a certain limit, the solenoid valve is controlled to close, so that the refrigerant in the liquid pipeline flows through the capillary bypass for throttling to reduce the refrigerant pressure. This solution has a feedback loop, which can use capillary to reduce pressure when necessary, so as to realize real-time adjustment of the pressure before the valve of the expansion valve, so that the operation of the expansion valve is more reliable, thereby improving the reliability and safety of the air conditioning system .

As shown in Fig. 8, based on the same inventive concept, the present application also provides a pressure control method applied to an air conditioning system. The method includes:

Step 101: Obtain the pressure value detected by the pressure detection module;

Step 102: Compare the acquired pressure value detected by the pressure detection module with the set pressure value;

Step 103: When the pressure value detected by the pressure detection module is greater than the set pressure value, control the decompression module to reduce the flow of condensate in the liquid pipeline; when the pressure value detected by the pressure detection module is less than the set pressure value, control the decrease The pressure module increases the flow of condensate in the liquid pipeline.

The pressure control method of the air conditioning system adopts the technical solution, wherein the pressure reducing module can be used to adjust the flow of condensate in the liquid pipeline, and the pressure reducing module can be selected as an electromagnetic pressure reducing valve or an electronic expansion valve. In this way, by first obtaining the pressure value detected by the pressure detection module, and comparing the obtained pressure value detected by the pressure detection module with the set pressure value, when the pressure value before the valve detected by the pressure detection module is greater than the set pressure value When the pressure-reducing module is controlled to act to reduce the flow of condensate in the liquid pipe, the pressure before the valve of the expansion valve is reduced below the set pressure value; when the pressure value detected by the pressure detection module is less than the set pressure value When the pressure reducing module is controlled to increase the flow of the condensate in the liquid pipeline, the pressure before the valve of the expansion valve is always the set pressure, so that the operation of the expansion valve is relatively stable.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

An air conditioning system, characterized by comprising: an outdoor unit and an indoor unit arranged in a direction from high to low, the outdoor unit includes a condenser, the indoor unit includes an expansion valve, and the air conditioning system further includes The pressure reducing module between the condenser and the expansion valve, wherein: the condenser, the pressure reducing module, and the expansion valve are connected in sequence through a liquid pipeline, and the pressure reducing module is used to adjust the The flow of condensate in the liquid pipeline.
The air conditioning system according to claim 1, wherein the decompression module is a capillary tube, and the capillary tube is disposed at the outlet of the condenser.
The air-conditioning system of claim 1, wherein the air-conditioning system further comprises a pressure detection module provided between the pressure reducing module and the expansion valve, the pressure detection module being used to detect the expansion The inlet pressure of the valve.
The air conditioning system of claim 3, wherein the pressure reducing module includes a solenoid valve and a capillary tube arranged in parallel; the air conditioning system further includes a control module, the control module is used to detect when the pressure detection module When the pressure value of is greater than the set pressure value, the solenoid valve is controlled to close; when the pressure value detected by the pressure detection module is less than the set pressure value, the solenoid valve is controlled to open.
The air-conditioning system according to claim 3, wherein the air-conditioning system further comprises a control module, the control module is used to control the reduction when the pressure value detected by the pressure detection module is greater than the set pressure value The pressure module reduces the flow of condensate in the liquid pipeline; when the pressure value detected by the pressure detection module is less than the set pressure value, the pressure reducing module is controlled to increase the flow of condensate in the liquid pipeline .
The air conditioning system of claim 5, wherein the control module is further configured to stop working when the pressure value detected by the pressure detection module is a target pressure value and the flow of condensate in the liquid pipe is the maximum .
The air conditioning system according to claim 4 or 5, wherein the pressure reducing module is arranged at the outlet of the condenser; or the pressure reducing module is arranged at the inlet of the expansion valve.
8. The air conditioning system of claim 7, wherein the pressure reducing module is an electromagnetic pressure reducing valve or an electronic expansion valve.
The air conditioning system of claim 1, wherein the indoor unit further comprises a compressor, and the air conditioning system further comprises a gas pipeline connecting the condenser and the compressor, and the gas pipeline is provided with a return Oil bend.
The air conditioning system of claim 9, further comprising an oil separator disposed between the condenser and the compressor, and the condenser, the oil separator, and the compressor pass through The gas pipelines are connected sequentially.
A pressure control method applied to the air-conditioning system according to claim 4, wherein the method comprises:

Obtain the pressure value detected by the pressure detection module;

Compare the pressure value detected by the acquired pressure detection module with the set pressure value;

When the pressure value detected by the pressure detection module is greater than the set pressure value, the control solenoid valve is closed; when the pressure value detected by the pressure detection module is less than the set pressure value, the control solenoid valve is opened.
A pressure control method applied to the air-conditioning system according to claim 5, wherein the method comprises:

Obtain the pressure value detected by the pressure detection module;

Compare the pressure value detected by the acquired pressure detection module with the set pressure value;

When the pressure value detected by the pressure detection module is greater than the set pressure value, the pressure reduction module is controlled to reduce the flow of condensate in the liquid pipeline; when the pressure value detected by the pressure detection module is less than the set pressure value, the pressure reduction module is controlled to The flow of condensate in the liquid pipe increases.
The control method of claim 12, wherein the method further comprises:

Compare the pressure value detected by the pressure detection module with the target pressure value;

When the pressure value detected by the pressure detection module is the target pressure value, and the flow of the condensate in the liquid pipe is the maximum, the control is exited.