CN115406135A - Air conditioning system - Google Patents

Abstract

The application provides an air conditioning system, including: a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a third heat exchanger and a closed-loop pipeline, the first heat exchanger, and the second heat exchanger , The third heat exchanger and the compressor are connected to the four-way valve, the first node of the closed-loop pipeline is connected to the first heat exchanger, and the second node of the closed-loop pipeline is connected to the second heat exchanger through the first throttling component The third node of the closed-loop pipeline is connected to the third heat exchanger, the second node of the closed-loop pipeline is connected to the fourth node of the closed-loop pipeline through the second throttling component, and the first valve is connected to the first node Between the second node, the second valve is connected between the second node and the third node, the third valve is connected between the third node and the fourth node, and the fourth valve is connected between the first node and the fourth node between.

Description

Air Conditioning System

technical field

The present application relates to the technical field of control, in particular to an air conditioning system.

Background technique

With the development of the economy, people's demand for energy saving and emission reduction of air conditioners is getting higher and higher. Heat recovery air conditioners have become the choice of more and more users because they can meet the needs of cooling and heating water at the same time, and can save users the cost of air conditioning operation.

At present, heat recovery air conditioners have problems such as insufficient heat recovery capacity and low energy efficiency, and these problems need to be further improved.

It should be noted that the above introduction to the technical background is only for the convenience of a clear and complete description of the technical solution of the present application, and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are known to those skilled in the art just because these solutions are described in the background technology section of this application.

Contents of the invention

The inventor of the present application found that in the existing heat recovery air-conditioning system, in order to realize the function of heat recovery, more parts are generally used, and the compressor needs to be stopped when the working mode is switched, so the convenience of use is insufficient .

In order to solve the above-mentioned problems or similar problems, the embodiment of the present application provides an air-conditioning system, which controls the flow direction of the refrigerant in the closed-loop pipeline through valves, and can reduce the number of parts in the air-conditioning system while improving the heat recovery capacity, and , when the air-conditioning system is switched between different modes, the downtime of the compressor is shorter, and the convenience of use is improved.

According to the first aspect of the embodiments of the present application, an air conditioning system is provided, the air conditioning system includes: a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a third heat exchanger and a closed-loop pipeline, The first heat exchanger, the second heat exchanger, the third heat exchanger and the compressor are connected to the four-way valve, wherein the closed-loop pipeline includes a first valve, a second valve, third valve and fourth valve,

The first node of the closed-loop pipeline is connected to the first heat exchanger,

The second node of the closed-loop pipeline is connected to the second heat exchanger through a first throttling component,

The third node of the closed-loop pipeline is connected to the third heat exchanger,

The second node of the closed-loop pipeline is connected to the fourth node of the closed-loop pipeline through a second throttling component,

The first valve is connected between the first node and the second node, so that the refrigerant flows from the first node to the second node in one direction,

The second valve is connected between the second node and the third node, so that the refrigerant flows from the third node to the second node in one direction,

The third valve is connected between the third node and the fourth node, so that the refrigerant flows from the fourth node to the third node in one direction,

The fourth valve is connected between the first node and the fourth node, so that the refrigerant flows from the fourth node to the first node in one direction.

The beneficial effects of the embodiments of the present application are: the heat recovery capability of the air conditioning system is improved, the number of parts is small, and when the air conditioning system is switched between different modes, the downtime of the compressor is shorter, and the convenience of use is improved.

With reference to the following description and accompanying drawings, specific embodiments of the present application are disclosed in detail, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not limited thereby in scope. Embodiments of the present application include many changes, modifications and equivalents within the scope of the terms of the appended notes.

Features described and/or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with, or instead of features in other embodiments .

It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of a feature, integer, step or component, but does not exclude the presence or addition of one or more other features, integers, steps or components.

Description of drawings

Elements and features described in one drawing or one embodiment of an embodiment of the present application may be combined with elements and features shown in one or more other drawings or embodiments. Furthermore, in the drawings, like numerals indicate corresponding parts in the several figures and may be used to indicate corresponding parts used in more than one embodiment.

The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation of the present application, and explain the principle of the present application together with the text description. Apparently, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative efforts. In the attached picture:

Fig. 1 is a schematic diagram of the closed pipeline of the air conditioning system of Embodiment 1 of the present application;

Fig. 2 is a schematic diagram of the air conditioning system of Embodiment 1 of the present application;

Fig. 3 is a schematic diagram of the air conditioning system of Modification 1 of the present application;

Fig. 4 is a schematic diagram of the air conditioning system of Modification 2 of the present application;

Fig. 5 is a schematic diagram of the closed pipeline of the air conditioning system of Embodiment 2 of the present application;

Fig. 6 is a schematic diagram of the air conditioning system of Embodiment 2 of the present application;

Fig. 7 is a schematic diagram of the air conditioning system of Modification 2 of the present application;

FIG. 8 is a schematic diagram of an air conditioning system according to Modification 2 of the present application.

Detailed ways

The foregoing and other features of the present application will become apparent from the following description, taken with reference to the accompanying drawings. In the specification and drawings, specific embodiments of the present application are specifically disclosed, which indicate some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments, on the contrary, the present application The application includes all amendments, variations and equivalents falling within the scope of the appended notes. Various embodiments of the present application will be described below in conjunction with the accompanying drawings. These embodiments are exemplary only, and do not limit the present application.

In this embodiment of the application, the terms "first", "second", etc. are used to distinguish different elements from the title, but do not indicate the spatial arrangement or time order of these elements, and these elements should not be referred to by these terms restricted. The term "and/or" includes any and all combinations of one or more of the associated listed items. The terms "comprising", "including", "having" and the like refer to the presence of stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components. In the description of the present application, unless otherwise specified, "plurality" means two or more.

In the embodiments of the present application, the singular forms "a", "the" and the like include plural forms, which should be broadly understood as "one" or "a category" rather than limited to "one"; in addition, the term "the " shall be understood to include both the singular and the plural unless the context clearly dictates otherwise. Furthermore, the term "based on" should be understood as "at least in part based on..." and the term "based on" should be understood as "at least in part based on...", unless the context clearly indicates otherwise.

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; may be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediary, and may be internal communication between two elements; in addition, in the conduction of fluids (for example, air-conditioning systems The "connection" between components or nodes on the pipeline where the refrigerant in) flows can be understood as "connection using refrigerant pipelines, the connected components or nodes are communicated through refrigerant pipelines, and the refrigerant can flow from the flow through the refrigerant pipeline". Those of ordinary skill in the art can understand the specific meanings of the above terms in this application based on specific situations.

In the description of this application, the first port of the four-way valve can be D port, the second port of the four-way valve can be C port, the third port of the four-way valve can be S port, and the fourth port of the four-way valve can be It can be port E. For the description of the D port, C port, E port and S port of the four-way valve, reference may be made to related technologies. The four-way valve can have two communication modes. In different communication modes, the communication modes of the four ports of the four-way valve are different. For example: in the first communication mode, the first port of the four-way valve (ie, D port) It communicates with port 2 (ie, port C), and port 3 (ie, port S) communicates with port 4 (port E); in the second mode, port 1 (ie, port E) of the four-way valve D port) is connected with the 4th port (ie, E port), and the 2nd port (ie, C port) is connected with the 3rd port (ie, S port).

Example 1

Embodiment 1 of the present application provides an air conditioning system. The air conditioning system can have a closed loop circuit.

FIG. 1 is a schematic diagram of the closed-loop pipeline of the air-conditioning system of Embodiment 1. As shown in FIG. 1 , the closed-loop pipeline 60 includes: a first valve 1 , a second valve 2 , a third valve 3 and a fourth valve 4 . The closed-loop pipeline 60 has a first node A, a second node B, a third node C1 and a fourth node D1.

The first valve 1 is connected between the first node A and the second node B, so that the refrigerant can flow in one direction from the first node A to the second node B; the second valve 2 is connected between the second node B and the third Between the nodes C1, the refrigerant can flow unidirectionally from the third node C1 to the second node B; the third valve 3 is connected between the third node C1 and the fourth node D1, so that the refrigerant can flow unidirectionally from the fourth node D1 Flow to the third node C1; the fourth valve 4 is connected between the first node A and the fourth node D1, so that the refrigerant can flow from the fourth node D1 to the first node A in one direction.

The first node A of the closed-loop pipeline 60 is connected to the first heat exchanger 30 , the third node C1 is connected to the third heat exchanger 50 , and one end of the first throttle member 71 is connected to the second heat exchanger 40 , one end of the second throttle member 72 is connected to the fourth node D1. The other end of the first throttling member 71 is connected to the other end of the second throttling member 72, and the second node B can be connected to the other end of the first throttling member 71 and the second throttling member 72 through the replaceable unit 1A. the other end of the connection.

In this embodiment, the closed-loop pipeline 60 is suitable for four-pipe applications. Wherein, when the closed-loop pipeline 60 is applied in an air-conditioning system (for example, an air-cooled heat pump), the components in the replaceable unit 1A can be changed according to different technical routes.

Fig. 2 is a schematic diagram of the air conditioning system of Embodiment 1 of the present application. As shown in FIG. 2 , the air conditioning system 100 includes: a compressor 10 , a four-way valve 20 , a first heat exchanger 30 , a second heat exchanger 40 , a third heat exchanger 50 and a closed-loop pipeline 60 .

As shown in FIG. 2 , the first heat exchanger 30 , the second heat exchanger 40 , the third heat exchanger 50 and the compressor 10 are connected to the four-way valve 20 . For example, the compressor 10, the first heat exchanger 30, the second heat exchanger 40 and the third heat exchanger 50 are connected to the first port (for example, D port) and the second port (for example, D port) of the four-way valve 20 respectively. C port), 3rd port (for example, S port) and 4th port (for example, E port).

In FIG. 2 , the compressor 10 does not have an air jet function, but the application is not limited thereto. In other embodiments, the compressor 10 can be replaced with a compressor with an air jet function.

The first heat exchanger 30 may be, for example, a wind-side heat exchanger, a fin-tube heat exchanger or a heat exchanger. The second heat exchanger 40 can be, for example, an air-conditioning side heat exchanger, and the second heat exchanger 40 can have a water inlet and a water outlet, so that the refrigerant entering the second heat exchanger 40 can flow in the second heat exchanger 40 Exchange heat with the water entering the second heat exchanger 40. The third heat exchanger 50 can be, for example, a hot water side heat exchanger or a heat recovery heat exchanger, and the third heat exchanger 50 can also have a water inlet and a water outlet, and the supply water flows into and out of the third heat exchanger 50, thereby , the refrigerant entering the third heat exchanger 50 can exchange heat with the water entering the third heat exchanger 50 in the third heat exchanger 50, so that the hot water flows out of the third heat exchanger, that is, the third heat exchanger The heater 50 can recover heat from the refrigerant to prepare hot water.

As shown in FIG. 2 , the closed-loop pipeline 60 includes a first valve 1 , a second valve 2 , a third valve 3 and a fourth valve 4 . The closed-loop pipeline 60 has a first node A, a second node B, a third node C1 and a fourth node D1.

The first node A of the closed-loop pipeline 60 is connected to the first heat exchanger 30, the second node B of the closed-loop pipeline 60 is connected to the second heat exchanger 40 through the first throttling component 71, and the closed-loop pipeline 60 The third node C1 of the closed-loop pipeline 60 is connected to the third heat exchanger 50 , and the second node B of the closed-loop pipeline 60 is connected to the fourth node D1 of the closed-loop pipeline 60 through the second throttling component 72 .

The first valve 1 is connected between the first node A and the second node B, so that the refrigerant can flow in one direction from the first node A to the second node B; the second valve 2 is connected between the second node B and the third Between the nodes C1, the refrigerant can flow unidirectionally from the third node C1 to the second node B; the third valve 3 is connected between the third node C1 and the fourth node D1, so that the refrigerant can flow unidirectionally from the fourth node D1 Flow to the third node C1; the fourth valve 4 is connected between the first node A and the fourth node D1, so that the refrigerant can flow from the fourth node D1 to the first node A in one direction.

As shown in Figure 2, in one embodiment, the first valve 1, the second valve 2, the third valve 3 and the fourth valve 4 can control the flow direction of the refrigerant, for example, the first valve 1, the second valve 2 , the third valve 3 and the fourth valve 4 are all one-way valves. However, it is not limited thereto, and the one-way valve can be replaced by other types of valves such as electric ball valves and other valves with on-off function.

As shown in FIG. 2 , the air conditioning system 100 may further include a liquid storage tank 8 and a gas-liquid separator 9 . The liquid storage tank 8 is used for storing refrigerant. The second node B may be connected to the first throttling part 71 and the second throttling part 72 through the liquid storage tank 8, or the liquid storage tank 8 may be connected between the second throttling part 72 and the fourth node D1. In addition, the air conditioning system 100 may not have the liquid storage tank 8 , or may be replaced by other devices, for example, the liquid storage tank 8 may be replaced by a flash evaporator or an economizer or the like. The gas-liquid separator 9 is also called gas separator 9 , and is used to separate the gaseous refrigerant from the gas-liquid mixed state refrigerant, so as to deliver the gaseous refrigerant to the suction port of the compressor 10 .

In addition, in this embodiment, the air conditioning system 100 may further include a controller (not shown). The controller can control the conducting state of the four-way valve 20, the opening and closing of the first throttling member 71, and the opening and closing of the second throttling member 72 according to the operating mode of the air conditioning system 100, so as to control the flow of refrigerant in the air conditioning system 100 direction. The four-way valve 20 can have two communication modes. Under different communication modes, the communication modes of the four ports of the four-way valve 20 are different, for example: in the first communication mode, the first port of the four-way valve 20 (that is, D port) is connected with the 2nd port (ie, C port), and the 3rd port (ie, S port) is connected with the 4th port (ie, E port); in the second mode, the 1st port of the four-way valve (that is, port D) is connected to the fourth port (that is, port E), and the second port (that is, port C) is connected to the third port (that is, port S).

The first port of the four-way valve 20 is connected to the exhaust port of the compressor 10; the second port of the four-way valve 20 is connected to the first heat exchanger 30; the third port of the four-way valve 20 is connected to the inlet of the gas fraction 9, and the gas The inlet of the sub-9 is also connected to the second heat exchanger 40, and the fifth valve 5 is connected between the third port of the four-way valve 20 and the inlet of the gas sub-9, and the fifth valve 5 allows the refrigerant to pass through the third port of the four-way valve 20. One-way flow to the inlet of the gas fraction 9, the fifth valve 5 is for example a one-way valve. The fourth port of the four-way valve is connected to the third heat exchanger 50 . Wherein, the function of the fifth valve 5 is to prevent the refrigerant from flowing to the first heat exchanger 30 when the ambient temperature is low.

Next, the working principle of the air conditioning system 100 will be described with reference to the accompanying drawings.

When the working mode of the air conditioning system 100 is cooling mode:

The four-way valve 20 is the first communication mode, that is, the first port (that is, D port) and the second port (that is, C port) are connected, the third port (that is, S port) and the fourth port (that is, E port) communication; the first throttling part 71 is opened, and the second throttling part 72 is closed; the refrigerant is discharged from the compressor 10 to the D port of the four-way valve 20, and enters the first heat exchanger through the C port of the four-way valve 20 30 condenses and releases heat to form a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows from point A through the first valve 1 to point B and then enters the liquid storage tank 8. The refrigerant flowing out of the liquid storage tank 8 is throttled by the first throttling member 71 Enter the second heat exchanger 40 to evaporate and absorb heat to form a gaseous state, and then flow through the gas fraction 9 to enter the suction port of the compressor 10 to complete a refrigeration cycle. In cooling mode, the first heat exchanger 30 and the second heat exchanger 40 participate in heat exchange.

When the working mode of the air conditioning system 100 is the hot water heating mode:

The four-way valve 20 is the second connection mode, that is, the first port (that is, D port) and the fourth port (that is, E port) of the four-way valve 20 are connected, and the second port (that is, C port) and the first port are connected. 3 ports (namely, S ports) are connected; the first throttling part 71 is closed, and the second throttling part 72 is opened; the refrigerant is discharged from the compressor 10 to the D port of the four-way valve 20, and enters through the E port of the four-way valve 20 The third heat exchanger 50 condenses and releases heat to form a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows to point C1, and then enters the liquid storage tank 8 through the second valve 2 to point B. The refrigerant flowing out of the liquid storage tank 8 passes through After throttling by the second throttling part 72, the fourth valve 4 passes through point A and enters the first heat exchanger 30 to evaporate and absorb heat to form a gaseous state. The gaseous refrigerant passes through the C port of the four-way valve 20 to the S port, and then flows through the gas component 9. Enter the suction port of the compressor 10 to complete a heating water cycle. In the hot water heating mode, the first heat exchanger 30 and the third heat exchanger 50 participate in heat exchange, and hot water is prepared through the third heat exchanger 50 .

When the working mode of the air conditioning system 100 is the heat recovery mode:

The four-way valve 20 is in the second connection mode, the first throttling part 71 is opened, and the second throttling part 72 is closed; the refrigerant is discharged from the compressor 10 to the D port of the four-way valve 20 and passes through the E port of the four-way valve 20 Enter the third heat exchanger 50 to condense and release heat to form a high-pressure liquid refrigerant. The liquid refrigerant flowing out of the third heat exchanger 50 flows to point C1, and flows to point B through the second valve 2 before entering the liquid storage tank 8. After being throttled by the first throttling part 71, it enters the second heat exchanger 40 to evaporate and absorb heat to form a gaseous state, and then flows through the gas component 9 to enter the suction port of the compressor 10 to complete a heat recovery cycle. In the heat recovery mode, the second heat exchanger 40 and the third heat exchanger 50 participate in heat exchange.

When the working mode of the air conditioning system 100 is the heating water defrosting mode:

The four-way valve 20 is in the first communication mode, the first throttling part 71 is closed, and the second throttling part 72 is opened; the refrigerant is discharged from the compressor 10 to the D port of the four-way valve 20 and passes through the C port of the four-way valve 20 Entering the first heat exchanger 30 to condense and release heat for defrosting, the refrigerant flowing out of the first heat exchanger 30 enters the liquid storage tank 8 through the first valve 1 and point B, and then flows to the second throttling member 72 after throttling. The three valves 3 enter the third heat exchanger 50 to evaporate and absorb heat to form a gaseous state. The gaseous refrigerant flowing out of the third heat exchanger 50 flows through the E port of the four-way valve 20 to the S port, and then flows through the gas component 9 into the compressor. 10 suction port, complete a hot water defrosting cycle. In the hot water defrosting mode, the first heat exchanger 30 and the third heat exchanger 50 participate in heat exchange, and the first heat exchanger 30 is defrosted by the refrigerant flowing out from the port C of the four-way valve 20 .

The operating modes of the air conditioning system 100 , the communication modes of the four-way valve 20 , the opening and closing states of the first throttle member 71 and the opening and closing states of the second throttle member 72 are shown in Table 1 below.

Table 1

In this embodiment, the flow direction of the refrigerant in the closed-loop pipeline 60 can be controlled by the valve, thereby reducing the number of parts in the air-conditioning system, and when the air-conditioning system 100 is switched between different modes, the compressor stops. The time is shorter, and the convenience of use is improved; moreover, the air-conditioning system 100 can realize full heat recovery under various working conditions, thereby improving the heat recovery capability.

Variation 1

Modification 1 is a modification of Embodiment 1.

FIG. 3 is a schematic diagram of an air conditioning system according to Modification 1. FIG. As shown in Figure 3, the difference between the air conditioning system 100a and the air conditioning system 100 is that, in Modification 1: an economizer 8a is used to replace the liquid storage tank 8 of Embodiment 1; a third throttling member 73 is added; A compressor 10a with an air injection function replaces the compressor 10 without an air injection function in Embodiment 1, and the compressor 10a has an air supply pipe 10a1. In addition, in FIG. 3 , the air conditioning system 100a may have a filter 90 whose function is to filter out impurities that may exist in the refrigerant. In addition, the filter 90 does not need to be installed in the air conditioning system.

As shown in FIG. 3 , in Modification 1, in the closed-loop pipeline 60 with respect to each node A, B, C1, D1 and the first valve 1 to the fourth valve 4, the first throttling member 71, and the second throttling member The description of 72 is the same as in Embodiment 1.

The second node B is connected to the first throttle member 71 and the second throttle member 72 through the economizer 8 a and the third throttle member 73 . The refrigerant entering the economizer 8a from the second node B is cooled and divided into two parts and output from the economizer 8a: one part is throttled by the third throttling member 73, and returns to the economizer 8a to evaporate and absorb heat, and becomes a medium-pressure gaseous state The refrigerant is input to the gas supply pipe 10a1 of the compressor 10a; the other part enters the first throttling part 71 or the second throttling part 72.

In the present application, the opening and closing state of the third throttling member 73 may be controlled by a controller.

Next, the working principle of the air conditioning system 100a will be described with reference to the accompanying drawings.

When the working mode of the air conditioning system 100a is cooling mode:

The four-way valve 20 is the first communication mode, that is, the first port (that is, D port) and the second port (that is, C port) are connected, the third port (that is, S port) and the fourth port (that is, E port) communication; the first throttling part 71 is opened, the second throttling part 72 is closed, and the third throttling part 73 is opened; the refrigerant is discharged from the compressor 10a to the D port of the four-way valve 20, and passes through the Port C enters the first heat exchanger 30 to condense and release heat to form a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows from point A through the first valve 1 to point B and then enters the economizer 8a for cooling. It is divided into two parts and output from the economizer 8a. : After being throttled by the third throttling part 73, a part returns to the economizer 8a to evaporate and absorb heat, and becomes a medium-pressure gaseous refrigerant, which is input to the air supply pipe 10a1 of the compressor 10a; the other part enters the first throttling part 71 After being throttled by the first throttling member 71, it enters the second heat exchanger 40 to evaporate and absorb heat to form a gaseous state, and then flows through the gas component 9 to enter the suction port of the compressor 10a to complete a refrigeration cycle. In cooling mode, the first heat exchanger 30 and the second heat exchanger 40 participate in heat exchange.

When the working mode of the air conditioning system 100a is the hot water heating mode:

The four-way valve 20 is the second connection mode, that is, the first port (that is, D port) and the fourth port (that is, E port) of the four-way valve 20 are connected, and the second port (that is, C port) and the first port are connected. 3 ports (namely, S ports) are connected; the first throttling part 71 is closed, the second throttling part 72 is opened, and the third throttling part 73 is opened; the refrigerant is discharged from the compressor 10a to the D port of the four-way valve 20, through The E port of the four-way valve 20 enters the third heat exchanger 50 to condense and release heat to form a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows to point C1, and flows to point B through the second valve 2, and then passes through the economizer 8a for cooling. , is divided into two parts and output from the economizer 8a: one part is throttled by the third throttling part 73, returns to the economizer 8a to evaporate and absorb heat, becomes a medium-pressure gaseous refrigerant, and is input to the air supply pipe 10a1 of the compressor 10a The other part enters the second throttling part 72, and after throttling through the second throttling part 72, enters the first heat exchanger 30 from the fourth valve 4 through point A to evaporate and absorb heat to form a gaseous state, and the gaseous refrigerant passes through the four-way valve 20 Port C and port S flow through the air component 9 and enter the suction port of the compressor 10a to complete a hot water heating cycle. In the hot water heating mode, the first heat exchanger 30 and the third heat exchanger 50 participate in heat exchange, and hot water is prepared through the third heat exchanger 50 .

When the working mode of the air conditioning system 100a is the heat recovery mode:

The four-way valve 20 is in the second communication mode, the first throttling part 71 is opened, the second throttling part 72 is closed, and the third throttling part 73 is opened; the refrigerant is discharged from the compressor 10a to the D port of the four-way valve 20, After passing through the E port of the four-way valve 20, it enters the third heat exchanger 50 to condense and release heat to form a high-pressure liquid refrigerant. The liquid refrigerant flowing out of the third heat exchanger 50 flows to point C1, and flows to point B through the second valve 2. point and then enters the economizer 8a for cooling, and is divided into two parts to be output from the economizer 8a: one part is throttled by the third throttling part 73, returns to the economizer 8a to evaporate and absorb heat, becomes a medium-pressure gaseous refrigerant, and is input to the The air supply pipe 10a1 of the compressor 10a; the other part enters the first throttling part 71, and the refrigerant enters the second heat exchanger 40 after being throttled by the first throttling part 71 to evaporate and absorb heat to form a gaseous state, and then flows through the gas component 9 to enter compression The suction port of machine 10a completes a heat recovery cycle. In the heat recovery mode, the second heat exchanger 40 and the third heat exchanger 50 participate in heat exchange.

When the working mode of the air conditioning system 100 is the heating water defrosting mode:

The four-way valve 20 is in the first communication mode, the first throttling part 71 is closed, the second throttling part 72 is opened, and the third throttling part 73 is opened; the refrigerant is discharged from the compressor 10a to the D port of the four-way valve 20, Through the port C of the four-way valve 20, it enters the first heat exchanger 30 to condense and release heat to defrost. The output of the economizer 8a: part of it is throttled by the third throttling part 73, returns to the economizer 8a to evaporate and absorb heat, and becomes a medium-pressure gaseous refrigerant, which is input to the air supply pipe 10a1 of the compressor 10a; the other part enters the second The throttling part 72 flows to the third valve 3 after being throttled by the second throttling part 72 and enters the third heat exchanger 50 to evaporate and absorb heat to form a gaseous state. The gaseous refrigerant flowing out of the third heat exchanger 50 passes through the four-way valve The E port of 20 flows to the S port, and then flows through the air component 9 into the suction port of the compressor 10 to complete a hot water defrosting cycle. In the hot water defrosting mode, the first heat exchanger 30 and the third heat exchanger 50 participate in heat exchange, and the first heat exchanger 30 is defrosted by the refrigerant flowing out from the port C of the four-way valve 20 .

The operating modes of the air conditioning system 100a, the communication mode of the four-way valve 20, the opening and closing state of the first throttle member 71, the opening and closing state of the second throttle member 72, and the opening and closing state of the third throttle member 73 are as follows shown in Table 2.

Table 2

In Modification 1, except that the same technical effect as that of the air conditioning system 100 of Embodiment 1 can be obtained, the air conditioning system 100a uses a compressor 10a with an air jet function and an economizer 8a, so it is stable under various working conditions. Enthalpy increase by gas injection can be achieved, and the performance of the air conditioning system 100a can be kept at an optimal state.

Variation 2

Modification 2 is another modification of Embodiment 1.

FIG. 4 is a schematic diagram of an air conditioning system according to Modification 2. FIG. As shown in Figure 4, the difference between the air-conditioning system 100b and the air-conditioning system 100 is that in Modification 2: a compressor 10a with an air-jet function is used to replace the compressor 10 without an air-jet function in Embodiment 1, and the compressor 10a There is an air supply pipe 10a1; a third throttling part 73 is added; the liquid storage tank 8 of Embodiment 1 is replaced by a flash tank 8b, and the flash tank 8b has a first gas pipe 8b1 and a first liquid pipe 8b2 (for example, liquid inlet pipe) and the second liquid pipe 8b3, wherein, the first air pipe 8b1 is connected to the gas supply pipe 10a1 of the compressor 10a, the first liquid pipe 8b2 is connected to the third throttling member 73, and the second liquid pipe 8b3 is connected to the first throttling member 71 and the second throttling member 72 are connected.

As shown in FIG. 4 , in Modification 2, in the closed-loop pipeline 60 with respect to each node A, B, C1, D1 and the first valve 1 to the fourth valve 4, the first throttling member 71, and the second throttling member The description of 72 is the same as in Embodiment 1.

The second node B is connected to the first throttling part 71 and the second throttling part 72 through the third throttling part 73 and the flash tank 8b. The refrigerant flowing through the second node B is throttled by the third throttling component 73 and then enters the flash tank 8b, and the refrigerant in the flash tank 8b is divided into two parts for output: the flashed gaseous refrigerant is input to the compressor 10a The gas supply pipe 10a1 ; the medium-pressure liquid refrigerant is input to the first throttling component 71 or the second throttling component 72 .

Next, the working principle of the air conditioning system 100b will be described with reference to the accompanying drawings.

When the working mode of the air conditioning system 100b is cooling mode:

The four-way valve 20 is the first communication mode, that is, the first port (that is, D port) and the second port (that is, C port) are connected, the third port (that is, S port) and the fourth port (that is, E port) communication; the first throttling part 71 is opened, the second throttling part 72 is closed, and the third throttling part 73 is opened; the refrigerant is discharged from the compressor 10a to the D port of the four-way valve 20, and passes through the Port C enters the first heat exchanger 30 to condense and release heat to form a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows from point A to point B through the first valve 1, and enters the flash tank 8b after throttling by the third throttling member 73. The refrigerant in the flash tank 8b is divided into two parts for output: the flash gaseous refrigerant is input to the air supply pipe 10a1 of the compressor 10a; the medium-pressure liquid refrigerant is input to the first throttling part 71, and passes through the first throttling part After throttling at 71, it enters the second heat exchanger 40 to evaporate and absorb heat to form a gaseous state, and then flows through the gas component 9 and enters the suction port of the compressor 10a to complete a refrigeration cycle. In cooling mode, the first heat exchanger 30 and the second heat exchanger 40 participate in heat exchange.

When the working mode of the air conditioning system 100b is the hot water heating mode:

The four-way valve 20 is the second connection mode, that is, the first port (that is, D port) and the fourth port (that is, E port) of the four-way valve 20 are connected, and the second port (that is, C port) and the first port are connected. 3 ports (namely, S ports) are connected; the first throttling part 71 is closed, the second throttling part 72 is opened, and the third throttling part 73 is opened; the refrigerant is discharged from the compressor 10a to the D port of the four-way valve 20, through Port E of the four-way valve 20 enters the third heat exchanger 50 to condense and release heat to form a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows to point C1, passes through the second valve 2 to point B, and passes through the third throttling member 73 After throttling, it enters the flash tank 8b, and the refrigerant in the flash tank 8b is divided into two parts for output: the flash gaseous refrigerant is input to the air supply pipe 10a1 of the compressor 10a; the medium-pressure liquid refrigerant is input to the second throttling Part 72, after throttling by the second throttling part 72, enters the first heat exchanger 30 from the fourth valve 4 through point A to evaporate and absorb heat to form a gaseous state. The gaseous refrigerant passes through the C port of the four-way valve 20 to the S port, and then flows The air enters the suction port of the compressor 10a through the gas fraction 9 to complete a heating water cycle. In the hot water heating mode, the first heat exchanger 30 and the third heat exchanger 50 participate in heat exchange, and hot water is prepared through the third heat exchanger 50 .

When the working mode of the air conditioning system 100b is the heat recovery mode:

The four-way valve 20 is in the second communication mode, the first throttling part 71 is opened, the second throttling part 72 is closed, and the third throttling part 73 is opened; the refrigerant is discharged from the compressor 10a to the D port of the four-way valve 20, After passing through the E port of the four-way valve 20, it enters the third heat exchanger 50 to condense and release heat to form a high-pressure liquid refrigerant. The liquid refrigerant flowing out of the third heat exchanger 50 flows to point C1, and flows to point B through the second valve 2. Point, throttling by the third throttling part 73 and then entering the flash tank 8b, the refrigerant in the flash tank 8b is divided into two parts for output: the flashed gaseous refrigerant is input to the air supply pipe 10a1 of the compressor 10a; The liquid refrigerant is input to the first throttling part 71, and after throttling by the first throttling part 71, the refrigerant enters the second heat exchanger 40 to evaporate and absorb heat to form a gaseous state, and then flows through the gas component 9 to enter the suction port of the compressor 10a , to complete a heat recovery cycle. In the heat recovery mode, the second heat exchanger 40 and the third heat exchanger 50 participate in heat exchange.

When the working mode of the air conditioning system 100 is the heating water defrosting mode:

The four-way valve 20 is in the first communication mode, the first throttling part 71 is closed, the second throttling part 72 is opened, and the third throttling part 73 is opened; the refrigerant is discharged from the compressor 10a to the D port of the four-way valve 20, Through the port C of the four-way valve 20, it enters the first heat exchanger 30 for condensing and exothermic defrosting. The flash tank 8b, the refrigerant in the flash tank 8b is divided into two parts for output: the flashed gaseous refrigerant is input to the air supply pipe 10a1 of the compressor 10a; the medium-pressure liquid refrigerant is input to the second throttling part 72, through The second throttling part 72 flows to the third valve 3 after throttling and enters the third heat exchanger 50 to evaporate and absorb heat to form a gaseous state. The gaseous refrigerant flowing out from the third heat exchanger 50 flows through the E port of the four-way valve 20 to the S port, then flows through the air component 9 and enters the suction port of the compressor 10 to complete a hot water defrosting cycle. In the hot water defrosting mode, the first heat exchanger 30 and the third heat exchanger 50 participate in heat exchange, and the first heat exchanger 30 is defrosted by the refrigerant flowing out from the port C of the four-way valve 20 .

The operating modes of the air conditioning system 100b, the communication mode of the four-way valve 20, the opening and closing state of the first throttle member 71, the opening and closing state of the second throttle member 72, and the opening and closing state of the third throttle member 73 are as follows Table 3 is shown.

table 3

In Modification 2, in addition to obtaining the same technical effect as the air conditioning system 100 of Embodiment 1, the air conditioning system 100b uses a compressor 10a with an air injection function and a flash tank 8b, thus under various working conditions Both can achieve enthalpy increase by air injection, and the performance of the air-conditioning system 100b can be kept in an optimal state.

Example 2

Embodiment 2 of the present application provides an air conditioning system. The air conditioning system can have a closed loop circuit.

FIG. 5 is a schematic diagram of the closed-loop pipeline of the air-conditioning system of Embodiment 2. FIG. Compared with the closed-loop pipeline 60 of FIG. 1, the closed-loop pipeline 60a shown in FIG. and the seventh valve 202 .

The seventh valve 202 is connected between the fourth node D1 and the third valve 3 . The seventh valve 202 controls the opening and closing of the refrigerant flow path, for example, the seventh valve 202 may be a solenoid valve. In a modified example, when the third valve 3 is a one-way valve, the seventh valve 202 and the third valve 3 can be replaced by an electric ball valve.

The sixth valve 201 is connected between the fifth node E1 and the sixth node B1, wherein the fifth node E1 may be a node on the connecting pipeline connecting one end of the first throttling component 71 and the second heat exchanger 40, and The six node B1 is in communication with the second node B. The sixth valve 201 allows refrigerant to flow from the fifth node E to the sixth node B1. For example, the sixth valve 201 may be a one-way valve.

In this embodiment, the closed loop circuit 60a is suitable for heat recovery applications. By setting a pipeline connecting the fifth node E1 and the sixth node B1, the closed-loop pipeline 60a can make the air conditioning system work in a heating mode, that is, the second heat exchanger 40 can both cool and heat. Wherein, when the closed-loop pipeline 60a is applied in an air-conditioning system (for example, an air-cooled heat pump), the components in the replaceable unit 1B can be changed according to different technical routes. For the description of the same reference numerals in FIG. 5 as in FIG. 1 , reference may be made to Embodiment 1.

Fig. 6 is a schematic diagram of the air conditioning system of Embodiment 2 of the present application. As shown in FIG. 6, the air conditioning system 200 includes a closed-loop pipeline 60a.

As shown in FIG. 6, the air conditioning system 200 is compared with the air conditioning system 100 shown in FIG. 2. In the air conditioning system 200 of FIG. The air conditioning system 100 also has the following changes: the third throttling part 73 is added; the compressor 10a without the air injection function is replaced by a compressor 10a with an air injection function, and the compressor 10a has an air supply pipe 10a1; a flash tank is used 8b replaces the liquid storage tank 8, and the flash tank 8b has a first gas pipe 8b1, a first liquid pipe (for example, a liquid inlet pipe) 8b2, and a second liquid pipe 8b3. Among them, the first air pipe 8b1 is connected to the gas supply pipe 10a1 of the compressor 10a, the first liquid pipe 8b1 is connected to the third throttling member 73, and the second liquid pipe 8b2 is connected to the other end of the first throttling member 71 and the second throttling member. The other end of the component 72 is connected; an additional four-way valve 20a is added, and the first port (ie, D port) of the additional four-way valve 20a is connected with the second port (ie, C port) of the four-way valve 20 .

As shown in FIG. 6, the second node B is connected to the first throttling part 71 and the second throttling part 72 through the third throttling part 73 and the flash tank 8b. The refrigerant flowing through the second node B is throttled by the third throttling component 73 and then enters the flash tank 8b, and the refrigerant in the flash tank 8b is divided into two parts for output: the flashed gaseous refrigerant is input to the compressor 10a The gas supply pipe 10a1 ; the medium-pressure liquid refrigerant is input to the first throttling component 71 and the second throttling component 72 .

When the seventh valve 202 is opened, the refrigerant is allowed to flow from the fourth node D1 to the third node C1; when the seventh valve 202 is closed, the refrigerant cannot flow through the third valve 3 . The opening and closing state of the third valve 3 can be controlled by a controller.

The additional four-way valve 20a also has a first communication mode and a second communication mode. In the first connection mode, the first port (that is, D port) and the second port (that is, C port) of the additional four-way valve 20a are connected, and the third port (that is, S port) and the fourth port (that is, , E port) communication; in the second mode, the first port (that is, D port) and the fourth port (that is, E port) of the additional four-way valve 20a are connected, and the second port (that is, C port) and The third port (ie, S port) is connected.

In Fig. 6, the first port of the four-way valve 20 is connected to the exhaust port of the compressor 10a; the second port of the four-way valve 20 is connected to the first port of the additional four-way valve 20a; the third port of the four-way valve 20 is connected to The inlet to the gas fraction 9; the fourth port of the four-way valve 20 is connected to the third heat exchanger 50.

The second port of the additional four-way valve 20a is connected to the first heat exchanger 30; the third port of the additional four-way valve 20a is connected to the third port of the four-way valve 20 through the fifth valve, and the fifth valve 5 allows the refrigerant to flow from the additional four-way The third port of the valve 20a unidirectionally flows to the third port of the four-way valve 20, and the fifth valve 5 is, for example, a one-way valve; the fourth port of the additional four-way valve 20a is connected to the second heat exchanger 40.

In Embodiment 2, the connection mode of the additional four-way valve 20a can also be controlled by the controller.

Each working mode of the air conditioning system 200, the communication mode of the four-way valve 20, the communication mode of the additional four-way valve 20a, the opening and closing state of the first throttling member 71, the opening and closing state of the second throttling member 72, the third section The opening and closing states of the flow member 73 and the opening and closing states of the seventh valve 202 are shown in Table 4 below.

Table 4

The flow direction of the refrigerant in each mode of the air conditioning system 200 in FIG. 6 is described below:

1. Cooling mode: exhaust port of compressor 10a → four-way valve 20 (D-C) → additional four-way valve 20a (D-C) → first heat exchanger 30 → point B → flash tank 8b (wherein, The air injection part of the flash tank 8b returns to the gas supply port 10a1 of the compressor 10a through the first air pipe 8b1, which will not be described in other modes) → first throttling component 71 → second heat exchanger 40 → additional four-way valve 20a (E～S)→gas fraction 9→suction port of compressor 10a.

2. Hot water heating mode: from compressor 10a exhaust port → four-way valve 20 (D～E) → third heat exchanger 50 → point C1 → point B → flash tank 8b → second throttling part 72 → Point D1→first heat exchanger 30→additional four-way valve 20a (C～S)→gas fraction 9→suction port of compressor 10a.

3. Hot water defrosting mode: from compressor 10a exhaust port → four-way valve 20 (D~C) → additional four-way valve 20a (D~C) → first heat exchanger 30 → point B → flash evaporation Tank 8b→second throttling part 72→point D1→point C1→third heat exchanger 50→four-way valve 20 (E～S)→gas fraction 9→suction port of compressor 10a.

4. Heat recovery mode: from compressor 10a exhaust port → four-way valve 20 (D～E) → third heat exchanger 50 → point C1 → point B → flash tank 8b → first throttling part 71 → second Second heat exchanger 40→additional four-way valve 20a (E～S)→gas fraction 9→suction port of compressor 10a.

5. Heating mode: from compressor 10a exhaust port → four-way valve 20 (D～C) → additional four-way valve 20a (D～E) → second heat exchanger 40 → point E1 → 201 → point B1 → Point B→flash tank 8b→second throttling part 72→point D1→first heat exchanger 30→additional four-way valve 20a (C～S)→gas fraction 9→suction port of compressor 10a.

6. Heating and defrosting mode: The flow direction is the same as that of the cooling mode, and it is used for defrosting during heating, so I won’t repeat it here.

Variation 1

Modification 1 is a modification of Embodiment 2.

FIG. 7 is a schematic diagram of an air conditioning system according to Modification 1 of Embodiment 2. FIG. As shown in Figure 7, the difference between the air conditioning system 200a and the air conditioning system 200 is that, in Modification 1: the economizer 8a is used instead of the flash tank 8b; the third throttling part 73 is connected between the economizer 8a and the first throttling part Between 71 and the second throttling component 72; the economizer 8a is connected to the air supply port 10a1 of the compressor 10a.

Each working mode of the air conditioning system 200a, the communication mode of the four-way valve 20, the communication mode of the additional four-way valve 20a, the opening and closing state of the first throttling member 71, the opening and closing state of the second throttling member 72, the third section The opening and closing states of the flow member 73 and the opening and closing states of the seventh valve 202 are shown in Table 5 below.

table 5

The flow direction of the refrigerant in each mode of the air conditioning system 200a of FIG. 7 is similar to the flow direction of the refrigerant in each mode of the air conditioning system 200 of FIG. , the refrigerant flows through the economizer 8a.

Variation 2

Modification 2 is a modification of Embodiment 2.

FIG. 8 is a schematic diagram of an air conditioning system according to Modification 2 of Embodiment 2. FIG. As shown in Figure 8, the difference between the air-conditioning system 200b and the air-conditioning system 200 is that, in modification 2: the liquid storage tank 8 is used instead of the flash tank 8b; the third throttling member 73 is not provided; a compressor without air injection is used 10 instead of compressor 10a with jet.

Each working mode of the air conditioning system 200b, the communication mode of the four-way valve 20, the communication mode of the additional four-way valve 20a, the opening and closing state of the first throttling member 71, the opening and closing state of the second throttling member 72, and the seventh valve The open and closed states of 202 are shown in Table 6 below.

Table 6

The refrigerant flow direction of the air conditioning system 200b in Figure 8 in each mode is similar to the refrigerant flow direction of the air conditioning system 200 in Figure 6 in each mode, the difference is that in Figure 6, the refrigerant flows through the flash tank 8b, while in Figure 8 , the refrigerant flows through the liquid storage tank 8 .

In Embodiment 1, Embodiment 2 and various modifications of the present application: in the system using the frequency conversion compressor, all modes can be switched without stopping; in the system using the fixed frequency compressor, the hot water and heat recovery can be Switch between non-stop.

In Embodiment 1, Embodiment 2 and various modifications of the present application, each mode can be switched without stopping the machine. Since the application of the four-pipe system has high requirements for water temperature control, the rapid change of load can be realized without stopping the machine. response.

In Embodiment 1, Embodiment 2 and various modifications of the present application, compared with other systems using partial heat recovery, the present application can perform full heat recovery in the heat recovery mode, therefore, the heat recovery capacity of the air conditioning system is improved; in addition , in the case of using a compressor with jet, the operating capacity and energy efficiency of each mode can be improved.

In Embodiment 1, Embodiment 2 and various modifications of the present application, the controller may be implemented by hardware, or by combining hardware and software. The present invention relates to such a computer-readable program that, when the program is executed by a logic component, enables the logic component to realize the above-mentioned device or constituent component, or enables the logic component to realize the above-mentioned various methods or steps. The present invention also relates to a storage medium for storing the above program, such as hard disk, magnetic disk, optical disk, DVD, flash memory and the like.

Each processing method in the controller described in conjunction with the embodiments of the present invention may be directly embodied as hardware, a software module executed by a processor, or a combination of both. For example, one or more controllers and/or one or more combinations of functional block diagrams may correspond to each software module or each hardware module of the computer program flow. These software modules can respectively correspond to the respective steps. These hardware modules, for example, can be realized by solidifying these software modules by using a Field Programmable Gate Array (FPGA).

A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art. A storage medium can be coupled to the processor such that the processor can read information from, and write information to, the storage medium, or it can be an integral part of the processor. The processor and storage medium can be located in the ASIC. The software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) adopts a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module can be stored in the MEGA-SIM card or large-capacity flash memory device.

One or more of the functions described for the controller and/or one or more combinations of the functional block diagrams can be implemented as a general-purpose processor, a digital signal processor (DSP), a dedicated integrated processor for performing the functions described in this application circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof. One or more of the functional block diagrams described for the controller and/or one or more combinations of the functional block diagrams can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, One or more microprocessors in communication with the DSP or any other such configuration.

The present invention has been described above in conjunction with specific embodiments, but those skilled in the art should be clear that these descriptions are all exemplary and not limiting the protection scope of the present invention. Those skilled in the art can make various variations and modifications to the present invention according to the principles of the present invention, and these variations and modifications are also within the scope of the present invention.

Claims (9)

1. An air conditioning system, comprising: a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a third heat exchanger and a closed loop pipeline, wherein the first heat exchanger, the second heat exchanger, the third heat exchanger and the compressor are connected to the four-way valve,

wherein,

the closed loop pipeline comprises a first valve, a second valve, a third valve and a fourth valve,

the first node of the closed loop pipeline is connected with the first heat exchanger,

the second node of the closed loop pipeline is connected with the second heat exchanger through a first throttling component,

a third node of the closed-loop circuit is connected with the third heat exchanger,

the second node of the closed-loop pipeline is connected with the fourth node of the closed-loop pipeline through a second throttling component,

the first valve is connected between the first node and the second node so that the refrigerant flows from the first node to the second node in a single direction,

the second valve is connected between the second node and the third node so that the refrigerant flows from the third node to the second node in a single direction,

the third valve is connected between the third node and the fourth node so that the refrigerant flows from the fourth node to the third node in one direction,

the fourth valve is connected between the first node and the fourth node, so that the refrigerant flows to the first node from the fourth node in a single direction.

2. The air conditioning system of claim 1,

the air conditioning system also comprises a liquid storage tank,

the second node is connected to the first throttling element and the second throttling element through the fluid reservoir,

or the liquid storage tank is connected between the second throttling component and the fourth node.

3. The air conditioning system of claim 1,

the compressor is provided with an air supplementing pipe,

the air conditioning system further includes an economizer and a third throttling element,

the second node is connected to the first inlet of the economizer,

the first outlet of the economizer is connected to the third throttling element and the second throttling element,

the third throttling part is connected between the first outlet and the second inlet of the economizer, one part of the refrigerant flowing out of the first outlet of the economizer flows into the third throttling part, and the other part of the refrigerant flows into the first throttling part or the second throttling part,

and the second outlet of the economizer is connected with the air supplementing pipe of the compressor.

4. The air conditioning system of claim 1,

the compressor is provided with an air supplementing pipe,

the air conditioning system further comprises a flash tank and a third throttling element,

the second node is connected to one liquid inlet pipe of the flash tank through the third throttling element,

and the air pipe of the flash tank is connected with the air supplementing pipe of the compressor.

5. The air conditioning system of claim 4,

the liquid pipe of the flash tank is connected to both the first throttling part and the second throttling part.

6. The air conditioning system of any of claims 1 to 5,

the air conditioning system further comprises a gas-liquid separator,

the 1 st port of the four-way valve is connected with the exhaust port of the compressor,

the 2 nd port of the four-way valve is connected with the first heat exchanger,

the 3 rd port of the four-way valve is connected with the inlet of the gas-liquid separator, the inlet of the gas-liquid separator is also connected with the second heat exchanger,

a fifth valve is connected between the 3 rd port of the four-way valve and the inlet of the gas-liquid separator, the fifth valve allows the refrigerant to flow from the 3 rd port of the four-way valve to the inlet of the gas-liquid separator in a single direction,

and the 4 th port of the four-way valve is connected with the third heat exchanger.

7. The air conditioning system of claim 4,

allowing refrigerant to flow from the fourth node to the third node when the third valve is open,

when the third valve is closed, the refrigerant does not flow through the third valve,

one liquid pipe of the flash tank is connected with the first throttling element,

the other liquid pipe of the flash tank is connected with the second throttling part.

8. The air conditioning system of claim 7,

the air conditioning system also comprises a gas-liquid separator and an additional four-way valve,

the 1 st port of the four-way valve is connected with the exhaust port of the compressor;

the 2 nd port of the four-way valve is connected with the 1 st port of the additional four-way valve;

the 3 rd port of the four-way valve is connected to the inlet of the gas-liquid separator;

the 4 th port of the four-way valve is connected with the third heat exchanger;

the 2 nd port of the additional four-way valve is connected with the first heat exchanger 30;

the 3 rd port of the additional four-way valve is connected with the 3 rd port of the four-way valve through a fifth valve, and the fifth valve allows a refrigerant to flow to the 3 rd port of the four-way valve from the 3 rd port of the additional four-way valve in a one-way manner;

and the 4 th port of the additional four-way valve is connected with the second heat exchanger.

9. The air conditioning system of claim 1, wherein the air conditioning system further comprises:

a sixth valve connected between the fifth node and the sixth node,

the fifth node is a node on a connecting pipeline connecting one end of the first throttling component and the second heat exchanger, the sixth node is communicated with the second node, and the sixth valve allows the refrigerant to flow from the fifth node to the sixth node.

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