Refrigerant control flow path, air conditioning system and control method

Abstract

This invention provides a refrigerant control flow path, air conditioning system, and control method for rapid heating, relating to the field of air conditioning technology. It solves the technical problem of heat loss within the four-way reversing valve and slow heating speed. The refrigerant control flow path includes a four-way reversing valve, a first refrigerant branch, a second refrigerant branch, a third refrigerant branch, and an isolation branch. One end of the isolation branch is connected to the second refrigerant branch located between the four-way reversing valve and the outdoor heat exchanger, and the other end is connected to the third refrigerant branch. It also includes control valves installed on the second, third, and isolation branches. By controlling the opening and closing of these control valves at different locations, the low-temperature refrigerant is prevented from recirculating through the four-way reversing valve during heating. This invention, through the installation of the isolation branch and optimized flow path design, reduces heat loss within the four-way reversing valve, enabling rapid heating.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a refrigerant control flow path, an air conditioning system, and a control method. Background Technology

[0002] When an existing air conditioner is in heating mode, the refrigerant circulation is slow at startup, preventing the indoor heat exchanger pipe temperature from rising quickly. Therefore, air conditioners typically have a 1-3 minute anti-cold-air period during which they cannot heat the room, resulting in slow indoor temperature rise. Furthermore, the high-temperature gaseous refrigerant discharged from the compressor passes through a four-way reversing valve before entering the indoor heat exchanger for heating. Both the high-temperature gaseous refrigerant discharged from the compressor and the low-temperature refrigerant from the outdoor heat exchanger outlet flow through the four-way reversing valve. This valve is typically made of copper and lacks internal insulation, leading to significant heat loss within it. This lowers the refrigerant temperature entering the indoor heat exchanger, resulting in a slow rise in the outlet air temperature and poor heating performance at startup.

[0003] To address the issues of heat loss and slow heating, existing technologies employ the following methods: 1. Installing a heat-insulating sleeve between the pipe and the valve seat, preventing direct connection and reducing energy loss between high-temperature, high-pressure media and low-temperature, low-pressure media. While this reduces heat loss to some extent, slow heating remains. 2. Incorporating vacuum insulation chambers within the valve core and pipes to reduce heat exchange between hot and cold media. Although this reduces heat loss to some extent, slow heating still persists. 3. After receiving a rapid heating command, the air conditioner first switches to cooling mode to heat the outdoor heat exchanger, reducing the viscosity of the lubricating oil in the refrigerant circulation system, before switching back to heating mode to quickly increase the coil temperature. While this provides rapid heating, heat loss remains a concern.

[0004] The applicant has discovered that the existing technology has at least the following technical problems: the above three solutions do not reduce the heat loss in the four-way valve from the control of the air conditioning system when heating, and cannot further increase the inlet temperature of the indoor heat exchanger. The inlet temperature of the indoor heat exchanger does not exceed the exhaust temperature of the compressor, so the heating effect cannot be further improved and the heating speed cannot be quickly increased. Summary of the Invention

[0005] The purpose of this invention is to provide a refrigerant control flow path, an air conditioning system, and a control method for rapid heating, thereby solving the technical problems of heat loss in the four-way reversing valve and slow air conditioning heating speed in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a refrigerant control flow path, comprising a four-way reversing valve, a first refrigerant branch, a second refrigerant branch, a third refrigerant branch, and an isolation branch; wherein:

[0008] One end of the first refrigerant branch is connected to the compressor, and the other end is connected to the first port of the four-way reversing valve;

[0009] One end of the second refrigerant branch is connected to the second port of the four-way reversing valve, and the other end passes through the indoor heat exchanger and the outdoor heat exchanger in sequence before being connected to the fourth port of the four-way reversing valve.

[0010] One end of the third refrigerant branch is connected to the third port of the four-way reversing valve, and the other end is connected to the liquid storage tank and the compressor in sequence.

[0011] One end of the isolation branch is connected to the second refrigerant branch located between the four-way reversing valve and the outdoor heat exchanger, and the other end is connected to the third refrigerant branch.

[0012] It also includes control valves installed on the second refrigerant branch, the third refrigerant branch, and the isolation branch. By controlling the opening and closing of the control valves at different positions, the low-temperature refrigerant can be prevented from flowing back through the four-way reversing valve during heating.

[0013] The refrigerant control flow path of the present invention optimizes the flow path design by setting up isolated branches, thereby reducing the heat loss inside the four-way reversing valve and enabling rapid heating. This solves the problem of slow heating speed in existing air conditioners. At the same time, it also solves the problem of large heat loss inside the four-way reversing valve and reduced inlet temperature of indoor heat exchanger when existing air conditioning systems are heating.

[0014] As a further improvement of the present invention, the control valve located on the second refrigerant branch is located between the outdoor heat exchanger and the four-way reversing valve.

[0015] As a further improvement of the present invention, the control valve located on the third refrigerant branch is located between the isolation branch connection point and the four-way reversing valve.

[0016] As a further improvement of the present invention, an electronic expansion valve is also provided on the second refrigerant branch between the indoor heat exchanger and the outdoor heat exchanger.

[0017] As a further improvement of the present invention, it also includes an auxiliary heating branch, one end of which is connected to the second refrigerant branch located at the second port of the four-way reversing valve, and the other end passes through the indoor auxiliary heat exchanger and is connected to the second refrigerant branch located at the outlet side of the electronic expansion valve.

[0018] As a further improvement of the present invention, the auxiliary heating branch includes a first auxiliary branch, a second auxiliary branch, and a vortex tube. A control valve is provided on the first auxiliary branch. The inlet end of the vortex tube is connected to the first auxiliary branch, the hot end of the vortex tube is connected to the second auxiliary branch, and the cold end of the vortex tube is connected to the isolation branch.

[0019] As a further improvement of the present invention, a one-way valve is also provided on the isolation branch.

[0020] As a further improvement of the present invention, a one-way valve is also provided on the second auxiliary branch located on the outlet side of the indoor auxiliary heat exchanger.

[0021] The present invention provides an air conditioning system, including the refrigerant control flow path.

[0022] The air conditioning system of the present invention avoids the high-temperature gaseous refrigerant discharged from the compressor and the low-temperature refrigerant at the outlet of the outdoor heat exchanger from exchanging heat at the four-way reversing valve during heating. This can increase the inlet temperature of the indoor heat exchanger, thereby achieving rapid heating. During heating, a portion of the compressor exhaust enters the vortex tube. After cold and hot separation, the refrigerant at the hot end outlet with a higher temperature enters the indoor auxiliary heat exchanger, rapidly increasing the pipe temperature and reducing the anti-cold air time.

[0023] The present invention provides a control method for controlling the refrigerant control flow path, the control method comprising the following steps:

[0024] Obtain the operating mode of the air conditioner;

[0025] When the air conditioner is in heating mode, the control valves on the third and second refrigerant branches are closed, and the control valves on the auxiliary heating and isolation branches are opened, so as to form a rapid heating mode in which high-temperature refrigerant flows through the four-way reversing valve and low-temperature refrigerant returns to the compressor through the isolation branch.

[0026] When the air conditioner is in cooling mode, the control valves on the third and second refrigerant branches are opened, while the control valves on the auxiliary heating and isolation branches are closed, so as to form a normal cooling mode in which both high-temperature and low-temperature refrigerant flow through the four-way reversing valve. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a diagram showing the refrigerant flow direction during heating in the air conditioning system of this invention;

[0029] Figure 2 This is a diagram showing the refrigerant flow direction during cooling in the air conditioning system of this invention;

[0030] Figure 3 This is a flowchart of the control method for the air conditioning system of the present invention;

[0031] Figure 4 This is a schematic diagram of the first connection state of the four-way reversing valve in the air conditioning system of the present invention;

[0032] Figure 5 This is a schematic diagram of the second connection state of the four-way reversing valve in the air conditioning system of the present invention.

[0033] In the diagram, 1—compressor; 2—four-way reversing valve; 3—indoor heat exchanger; 4—electronic expansion valve; 5—outdoor heat exchanger; 6—liquid receiver; 7—indoor fan; 8—outdoor fan; 9, 13, 14, 16—control valves; 10—vortex tube; 101—hot end; 102—cold end; 11—indoor auxiliary heat exchanger; 12, 15—check valves. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0035] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the present invention provides a refrigerant control flow path, including a four-way reversing valve 2, a first refrigerant branch, a second refrigerant branch, a third refrigerant branch, and an isolation branch; wherein:

[0036] One end of the first refrigerant branch is connected to compressor 1, and the other end is connected to the first port of four-way reversing valve 2;

[0037] One end of the second refrigerant branch is connected to the second port of the four-way reversing valve 2, and the other end passes through the indoor heat exchanger 3 and the outdoor heat exchanger 5 in sequence before being connected to the fourth port of the four-way reversing valve 2.

[0038] One end of the third refrigerant branch is connected to the third port of the four-way reversing valve 2, and the other end is connected to the liquid storage tank 6 and the compressor 1 in sequence.

[0039] One end of the isolation branch is connected to the second refrigerant branch located between the four-way reversing valve 2 and the outdoor heat exchanger 5, and the other end is connected to the third refrigerant branch.

[0040] It also includes control valves 9, 13, 14, and 16 installed on the second refrigerant branch, the third refrigerant branch, and the isolation branch. By controlling the opening and closing of control valves 9, 13, 14, and 16 at different positions, the low-temperature refrigerant can be returned without passing through the four-way reversing valve 2 during heating.

[0041] The refrigerant control flow path of this invention, through the setting of an isolation branch and optimized flow path design, allows high-temperature refrigerant to enter the indoor heat exchanger after passing through the compressor and the four-way reversing valve for heating. Then, after exchanging heat with the outdoor heat exchanger 5, the low-temperature refrigerant does not return through the four-way reversing valve 2, but instead returns through the isolation branch to the liquid storage tank 6 and then enters the compressor 1. Since the high-temperature and low-temperature refrigerants do not flow through the four-way reversing valve 2 together during heating, heat exchange between hot and cold is avoided, reducing heat loss inside the four-way reversing valve 2 and enabling rapid heating. This solves the problem of slow heating speed in existing air conditioners and also solves the problem of large heat loss in the four-way reversing valve during heating in existing air conditioning systems, which reduces the inlet temperature of the indoor heat exchanger.

[0042] As an optional embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the control valve 13 on the second refrigerant branch is located between the outdoor heat exchanger 5 and the four-way reversing valve 2. Furthermore, an isolation branch connects the second refrigerant branch between the control valve 13 and the outdoor heat exchanger 5, with the other end connected to the third refrigerant branch. When the control valve 13 is closed, the low-temperature refrigerant after heat exchange in the outdoor heat exchanger 5 will not flow back into the four-way reversing valve 2, but will directly flow back into the liquid storage tank 6 via the isolation branch and the third refrigerant branch. Of course, to prevent backflow, a one-way valve 15 should be installed at the connection between the isolation branch and the third refrigerant branch. By installing the one-way valve 15, the low-temperature refrigerant will not flow back in reverse when flowing from the isolation branch to the third refrigerant branch.

[0043] In one optional embodiment of the present invention, the control valve 16 located on the third refrigerant branch is situated between the isolation branch connection point and the four-way reversing valve 2. The opening and closing of the control valve 16 enables the connection or disconnection of the third refrigerant branch between the four-way reversing valve 2 and the isolation branch.

[0044] Furthermore, an electronic expansion valve 4 is also installed on the second refrigerant branch between the indoor heat exchanger 3 and the outdoor heat exchanger 5.

[0045] Furthermore, an indoor fan 7 is also installed inside the indoor heat exchanger 3 to improve heat exchange efficiency.

[0046] To further improve the heating speed, an auxiliary heating branch is also included. One end of the auxiliary heating branch is connected to the second refrigerant branch located at the second port of the four-way reversing valve 2, and the other end passes through the indoor auxiliary heat exchanger 11 and is connected to the second refrigerant branch located at the outlet side of the electronic expansion valve 4.

[0047] By setting up an auxiliary heating branch and an indoor auxiliary heat exchanger 11, a portion of the high-temperature refrigerant can be diverted into the indoor auxiliary heat exchanger 11 for heat exchange and heating.

[0048] In order to improve the heating speed, in this embodiment, such as Figure 1 and Figure 2 As shown, the auxiliary heating branch includes a first auxiliary branch, a second auxiliary branch, and a vortex tube 10. A control valve 9 is installed on the first auxiliary branch. The inlet end of the vortex tube 10 is connected to the first auxiliary branch, the hot end 101 of the vortex tube 10 is connected to the second auxiliary branch, and the cold end 102 of the vortex tube 10 is connected to the isolation branch.

[0049] To prevent refrigerant backflow, in this embodiment, a one-way valve 12 is also provided on the second auxiliary branch at the outlet side of the indoor auxiliary heat exchanger 11.

[0050] In the refrigerant control flow path of the present invention, during heating, the low-temperature refrigerant at the outlet of the outdoor heat exchanger 5 flows through the bypass and does not enter the four-way reversing valve 2, thereby reducing the heat loss of the compressor 1 exhaust and increasing the temperature of the refrigerant entering the indoor heat exchanger 3 to achieve rapid heating; during heating, a portion of the compressor exhaust enters the vortex tube, and after cold and hot separation, the refrigerant at the hot end outlet with a higher temperature enters the indoor auxiliary heat exchanger, rapidly increasing the pipe temperature and reducing the time for preventing cold air.

[0051] like Figure 1 and Figure 2 As shown, the present invention provides an air conditioning system including the above-mentioned refrigerant control flow path.

[0052] Example 1:

[0053] When the air conditioning system is in heating mode, such as Figure 1 and Figure 4As shown, the high-temperature gaseous refrigerant from the compressor 1 outlet enters the four-way reversing valve 2 via the first refrigerant branch. At this time, the control valve 9 is opened, and a portion of the high-temperature refrigerant enters the indoor heat exchanger 3 via the second refrigerant branch. Another portion of the high-temperature refrigerant enters the vortex tube 10 via the auxiliary heating branch. Within the vortex tube 10, the pressure is reduced for heat separation. The refrigerant at the hot end 101 of the vortex tube 10, with an even higher temperature, enters the indoor auxiliary heat exchanger 11 to quickly heat the heat exchange tubes, enabling rapid heating and shortening the anti-cold-air time. The refrigerant from the indoor heat exchanger 3 outlet, after being depressurized by the electronic expansion valve, mixes with the low-pressure refrigerant from the indoor auxiliary heat exchanger 11 outlet and enters the outdoor heat exchanger 5. At this time, the control valve 13 is closed, and the control valve 14 is opened. The low-temperature refrigerant from the outdoor heat exchanger 5 outlet mixes with the low-temperature gaseous refrigerant from the cold end 102 of the vortex tube 10 and flows through the one-way valve 15 into the liquid receiver 6 and the compressor 1 inlet. At this time, control valve 16 is closed to prevent the low-temperature refrigerant flowing through check valve 15 from flowing back into four-way reversing valve 2.

[0054] During heating, by controlling the flow of refrigerant, the high-temperature gaseous refrigerant discharged from the compressor and the low-temperature refrigerant at the outlet of the outdoor heat exchanger 5 do not flow through the four-way reversing valve 2 at the same time. This reduces the heat loss in the four-way reversing valve 2, increases the inlet temperature of the indoor heat exchanger 3, and enables rapid heating of the heat exchanger, thus achieving rapid heating.

[0055] The working principle of the vortex tube is described as follows: High-pressure compressor exhaust enters tangentially through the inlet of the vortex tube 10. Inside the vortex tube, it expands and undergoes high-speed circular motion to form a free vortex. The angular velocity of the central fluid near the axis of the vortex tube is greater than that of the peripheral fluid on the inner wall of the vortex tube. The central fluid and the peripheral fluid exchange energy. The peripheral fluid gains energy, its temperature increases, and it flows out from the hot end outlet of the vortex tube. The central fluid loses energy, its temperature decreases, and it flows out from the cold end outlet of the vortex tube in the opposite direction. This allows for rapid separation of hot and cold fluids.

[0056] It should be noted that if Figure 4 The diagram shown is a schematic of the first connection state of the four-way reversing valve 2, which is when the air conditioning system is in heating mode.

[0057] During heating, the high-temperature gaseous refrigerant discharged from the compressor and the low-temperature refrigerant at the outdoor heat exchanger outlet are both separated by the four-way reversing valve, which increases the inlet temperature of the indoor heat exchanger, thus achieving rapid heating. During heating, a portion of the compressor exhaust enters the vortex tube. After cold and hot separation, the refrigerant at the hot end outlet, with a higher temperature, enters the indoor auxiliary heat exchanger, rapidly increasing the pipe temperature and reducing the time required to prevent cold air from entering.

[0058] Example 2:

[0059] like Figure 2As shown, during cooling, the four-way valve reverses, and the high-temperature gaseous refrigerant from the compressor 1 outlet enters the four-way reversing valve 2 through the first refrigerant branch. At this time, control valve 13 opens and control valve 14 closes, allowing the refrigerant to enter the outdoor heat exchanger 5 for condensation. The condensed liquid refrigerant then passes through the electronic expansion valve 4 to reduce its pressure before entering the indoor heat exchanger 3 for evaporation. Meanwhile, check valve 12 prevents refrigerant from flowing into the indoor auxiliary heat exchanger 11. The refrigerant from the outlet of the indoor heat exchanger 3 enters the liquid receiver 6 and the compressor 1 inlet through the four-way valve 2. At this time, control valve 9 closes and control valve 16 opens to prevent refrigerant from entering the vortex tube 10. Check valve 15 prevents refrigerant backflow.

[0060] The air conditioning system of the present invention avoids the high-temperature gaseous refrigerant discharged from the compressor and the low-temperature refrigerant at the outlet of the outdoor heat exchanger from exchanging heat at the four-way reversing valve during heating. This can increase the inlet temperature of the indoor heat exchanger, thereby achieving rapid heating. During heating, a portion of the compressor exhaust enters the vortex tube. After cold and hot separation, the refrigerant at the hot end outlet with a higher temperature enters the indoor auxiliary heat exchanger, rapidly increasing the pipe temperature and reducing the anti-cold air time.

[0061] like Figure 3 As shown, in order to achieve the switching between air conditioning cooling and heating modes, the present invention provides a control method for controlling the refrigerant control flow path. The control method includes the following steps:

[0062] When the air conditioning system is running, obtain the air conditioning's operating mode;

[0063] When the air conditioner is in heating mode, the control valves on the third and second refrigerant branches are closed, while the control valves on the auxiliary heating and isolation branches are opened. This creates a rapid heating mode where high-temperature refrigerant flows through the four-way reversing valve, and low-temperature refrigerant returns to the compressor via the isolation branch. Specifically, the four-way reversing valve 2 is in its first connected state, control valves 13 and 16 are closed, and control valves 9 and 14 are opened. A schematic diagram of the first connected state of the four-way reversing valve is shown below. Figure 4 As shown.

[0064] When the air conditioner is in cooling mode, the control valves on the third and second refrigerant branches are opened, and the control valves on the auxiliary heating and isolation branches are closed, so as to form a normal cooling mode in which both high-temperature and low-temperature refrigerant flows through the four-way reversing valve. Specifically, when in cooling mode, the four-way reversing valve 2 is switched to the second connected state, control valves 13 and 16 are opened, and control valves 9 and 14 are closed.

[0065] like Figure 5 The diagram shows the second connection state of the four-way reversing valve 2, which is when the air conditioning system is in cooling mode.

[0066] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A refrigerant control flow path, characterized in that, Includes a four-way reversing valve, a first refrigerant branch, a second refrigerant branch, a third refrigerant branch, and an isolation branch; among which: One end of the first refrigerant branch is connected to the compressor, and the other end is connected to the first port of the four-way reversing valve; One end of the second refrigerant branch is connected to the second port of the four-way reversing valve, and the other end passes through the indoor heat exchanger and the outdoor heat exchanger in sequence before being connected to the fourth port of the four-way reversing valve. One end of the third refrigerant branch is connected to the third port of the four-way reversing valve, and the other end is connected to the liquid storage tank and the compressor in sequence. One end of the isolation branch is connected to the second refrigerant branch located between the four-way reversing valve and the outdoor heat exchanger, and the other end is connected to the third refrigerant branch. It also includes control valves installed on the second refrigerant branch, the third refrigerant branch, and the isolation branch. By controlling the opening and closing of the control valves at different positions, the low-temperature refrigerant can be prevented from flowing back through the four-way reversing valve during heating.

2. The refrigerant control flow path according to claim 1, characterized in that, The control valve located on the second refrigerant branch is situated between the outdoor heat exchanger and the four-way reversing valve.

3. The refrigerant control flow path according to claim 1, characterized in that, The control valve located on the third refrigerant branch is situated between the isolation branch connection point and the four-way reversing valve.

4. The refrigerant control flow path according to claim 1, characterized in that, An electronic expansion valve is also installed on the second refrigerant branch between the indoor heat exchanger and the outdoor heat exchanger.

5. The refrigerant control flow path according to claim 4, characterized in that, It also includes an auxiliary heating branch, one end of which is connected to the second refrigerant branch located at the second port of the four-way reversing valve, and the other end passes through the indoor auxiliary heat exchanger and is connected to the second refrigerant branch located at the outlet side of the electronic expansion valve.

6. The refrigerant control flow path according to claim 5, characterized in that, The auxiliary heating branch includes a first auxiliary branch, a second auxiliary branch, and a vortex tube. A control valve is provided on the first auxiliary branch. The inlet end of the vortex tube is connected to the first auxiliary branch, the hot end of the vortex tube is connected to the second auxiliary branch, and the cold end of the vortex tube is connected to the isolation branch.

7. The refrigerant control flow path according to claim 1, characterized in that, A one-way valve is also installed on the isolation branch.

8. The refrigerant control flow path according to claim 6, characterized in that, A one-way valve is also installed on the second auxiliary branch on the outlet side of the indoor auxiliary heat exchanger.

9. An air conditioning system, characterized in that, Includes the refrigerant control flow path as described in any one of claims 1-8.

10. A control method, characterized in that, The control method is used to control the refrigerant control flow path as described in any one of claims 1-8, and the control method includes the following steps: Obtain the operating mode of the air conditioner; When the air conditioner is in heating mode, the control valves on the third and second refrigerant branches are closed, and the control valves on the auxiliary heating and isolation branches are opened, so as to form a rapid heating mode in which high-temperature refrigerant flows through the four-way reversing valve and low-temperature refrigerant returns to the compressor through the isolation branch. When the air conditioner is in cooling mode, the control valves on the third and second refrigerant branches are opened, while the control valves on the auxiliary heating and isolation branches are closed, so as to form a normal cooling mode in which both high-temperature and low-temperature refrigerant flow through the four-way reversing valve.

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