Refrigerant control flow path, air conditioning system and control method

Abstract

The invention provides a refrigerant control flow path capable of rapidly heating, an air conditioning system and a control method, relates to the technical field of air conditioners, and solves the technical problems of heat loss in a four-way reversing valve and slow heating speed of an air conditioner. The refrigerant control flow path comprises 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 of the isolation branch is connected with the third refrigerant branch. The system further comprises control valves arranged on the second refrigerant branch, the third refrigerant branch and the isolation branch, and low-temperature refrigerants can flow back without passing through the four-way reversing valve during heating by controlling opening and closing of the control valves at different positions. According to the four-way reversing valve, the isolation branch is arranged, flow path optimization design is carried out, heat loss in the four-way reversing valve is reduced, and rapid heating can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a refrigerant control flow path, an air conditioning system and a control method. Background Art

[0002] When the existing air conditioner is in heating operation, the indoor heat exchanger tube temperature cannot rise quickly due to the slow refrigerant circulation when it is just turned on. Therefore, the air conditioner usually has a cold wind protection time of 1-3 minutes. During the cold wind protection period, the indoor temperature cannot be heated and the indoor temperature rises slowly. In addition, the high-temperature gaseous refrigerant discharged by the compressor enters the indoor heat exchanger for heating after passing through the four-way reversing valve. The high-temperature gaseous refrigerant discharged by the compressor and the low-temperature refrigerant at the outlet of the outdoor heat exchanger both flow through the four-way reversing valve. The four-way reversing valve is usually made of copper and has no insulation material inside. Therefore, there will be a large heat loss in the four-way reversing valve, which reduces the refrigerant temperature entering the indoor heat exchanger, resulting in a slow rise in the outlet air temperature when the machine is just turned on, and a poor heating effect.

[0003] In order to solve the problems of heat loss and slow heating, the existing technology adopts: 1. An insulating sleeve is set between the connecting pipe and the valve seat so that the connecting pipe and the valve seat are not directly connected, reducing the energy loss between the high-temperature and high-pressure medium and the low-temperature and low-pressure medium. Although the heat loss is reduced to a certain extent, the problem of slow heating still exists; 2. By setting a vacuum insulation cavity in the valve core and the pipeline, the heat exchange of cold and hot media is reduced. Although the heat loss is reduced to a certain extent, the problem of slow heating still exists; 3. After the air conditioner receives the fast heating command, it is first adjusted to the cooling mode, heating the outdoor heat exchanger, reducing the viscosity of the lubricating oil in the refrigerant circulation system, and then switching back to the heating mode to quickly increase the coil temperature; although it can heat quickly, the problem of heat loss still exists.

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

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

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A refrigerant control flow path provided by the present invention comprises 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 and then is 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 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 arranged on the second refrigerant branch, the third refrigerant branch and the isolation branch, which control the opening and closing of the control valves at different positions to achieve the reflux of low-temperature refrigerant without passing 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 an isolation branch, reduces the heat loss inside the four-way reversing valve, can quickly heat, and solves the problem of slow heating speed of existing air conditioners. At the same time, it solves the problem that when the existing air-conditioning system is heating, the heat loss in the four-way reversing valve is large, thereby reducing the inlet temperature of the indoor heat exchanger.

[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 further 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 on 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, and the first auxiliary branch is provided with a control valve; the inlet end of the vortex tube is connected to the first auxiliary branch, and the hot end of the vortex tube is connected to the second auxiliary branch; 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 further provided on the second auxiliary branch line at the outlet side of the indoor auxiliary heat exchanger.

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

[0022] The air-conditioning system of the present invention avoids heat exchange between the high-temperature gaseous refrigerant discharged from the compressor and the low-temperature refrigerant at the outlet of the outdoor heat exchanger in the four-way reversing valve during heating, and 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, and after cold and hot separation, the refrigerant with a higher temperature at the hot end outlet enters the indoor auxiliary heat exchanger, which quickly increases the tube temperature and reduces the cold wind protection time.

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

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

[0025] When the operation mode of the air conditioner is the heating mode, the control valves on the third refrigerant branch and the second refrigerant branch are controlled to be closed, and the control valves on the auxiliary heating branch and the isolation branch are controlled to be opened, so as to form a fast heating mode in which the high-temperature refrigerant flows through the four-way reversing valve and the low-temperature refrigerant flows back to the compressor through the isolation branch;

[0026] When the air conditioner operates in cooling mode, the control valves on the third refrigerant branch and the second refrigerant branch are controlled to open, and the control valves on the auxiliary heating branch and the isolation branch are controlled to close, so as to form a conventional cooling mode in which both the high-temperature refrigerant flow and the low-temperature refrigerant flow through the four-way reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a refrigerant flow diagram of the air conditioning system of the present invention when heating;

[0029] Figure 2 is a refrigerant flow diagram of the air conditioning system of the present invention during refrigeration;

[0030] Figure 3 is a flow chart of a control method of an air conditioning system of the present invention;

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

[0032] Figure 5 It 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 figure, 1 is a compressor; 2 is a four-way reversing valve; 3 is an indoor heat exchanger; 4 is an electronic expansion valve; 5 is an outdoor heat exchanger; 6 is a liquid storage tank; 7 is an indoor fan; 8 is an outdoor fan; 9, 13, 14, 16 are control valves; 10 is a vortex tube; 101 is a hot end; 102 is a cold end; 11 is an indoor auxiliary heat exchanger; 12, 15 are check valves. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present 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 the compressor 1, and the other end is connected to the first port of the 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 and then is 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 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, 16 arranged on the second refrigerant branch, the third refrigerant branch and the isolation branch. By controlling the opening and closing of the control valves 9, 13, 14, 16 at different positions, the reflux of the low-temperature refrigerant without passing through the four-way reversing valve 2 during heating is achieved.

[0041] The refrigerant control flow path of the present invention is optimized by setting an isolation branch, so that the high-temperature refrigerant enters the four-way reversing valve through the compressor and then enters the indoor heat exchanger for heating. Then, after the low-temperature refrigerant exchanges heat with the outdoor heat exchanger 5, it does not return through the four-way reversing valve 2, but returns to the liquid storage tank 6 through the isolation branch and then enters the compressor 1. Since the high-temperature refrigerant and the low-temperature refrigerant will not flow through the four-way reversing valve 2 together during heating, heat exchange between cold and hot is avoided, and the heat loss inside the four-way reversing valve 2 is reduced. It can heat quickly, which solves the problem of slow heating speed of existing air conditioners. At the same time, it solves the problem that the heat loss in the four-way reversing valve is large during heating in the existing air-conditioning system, thereby reducing the inlet temperature of the indoor heat exchanger.

[0042] As an optional embodiment of the present invention, Figure 1 and Figure 2 As shown, the control valve 13 located on the second refrigerant branch is located between the outdoor heat exchanger 5 and the four-way reversing valve 2. Furthermore, the isolation branch is connected to the second refrigerant branch between the control valve 13 and the outdoor heat exchanger 5, and the other end is 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 to the liquid storage tank 6 through the isolation branch and the third refrigerant branch; of course, in order to prevent backflow, a one-way valve 15 should be set at the connection between the isolation branch and the third refrigerant branch; by setting the one-way valve 15, the low-temperature refrigerant will not flow back when it flows to the third refrigerant branch through the isolation branch.

[0043] As an optional embodiment of the present invention, the control valve 16 located on the third refrigerant branch is located between the isolation branch connection point and the four-way reversing valve 2. The opening and closing of the control valve 16 can realize the opening and closing of the third refrigerant branch between the four-way reversing valve 2 and the isolation branch.

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

[0045] Furthermore, an indoor fan 7 is provided in the indoor heat exchanger 3 to improve the heat exchange efficiency.

[0046] In order 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 on the outlet side of the electronic expansion valve 4.

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

[0048] In order to increase the heating speed, in this embodiment, 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. The first auxiliary branch is provided with a control valve 9; 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; the cold end 102 of the vortex tube 10 is connected to the isolation branch.

[0049] In order to prevent the refrigerant from flowing back, in the present embodiment, a one-way valve 12 is further provided on the outlet side of the indoor auxiliary heat exchanger 11 on the second auxiliary branch.

[0050] The refrigerant control flow path of the present invention is that 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 exhaust gas of the compressor 1 and increasing the temperature of the refrigerant entering the indoor heat exchanger 3, thereby realizing rapid heating; during heating, a part of the compressor exhaust gas enters the vortex tube, and after the cold and hot separation, the refrigerant with a higher temperature at the hot end outlet enters the indoor auxiliary heat exchanger, thereby rapidly increasing the tube temperature and reducing the cold wind protection time.

[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] Embodiment 1:

[0053] When the air conditioning system is in heating mode, Figure 1 and Figure 4As shown, the high-temperature gaseous refrigerant at the outlet of the compressor 1 enters the four-way reversing valve 2 through the first refrigerant branch. At this time, the control valve 9 is opened, and a part of the high-temperature refrigerant enters the indoor heat exchanger 3 through the second refrigerant branch. Another part of the high-temperature refrigerant enters the vortex tube 10 through the auxiliary heating branch, and the pressure is reduced in the vortex tube 10 for cold and hot separation. The higher temperature refrigerant at the outlet of the hot end 101 of the vortex tube 10 enters the indoor auxiliary heat exchanger 11 to quickly heat the heat exchange tube for rapid heating and shortening the cold wind protection time. The refrigerant at the outlet of the indoor heat exchanger 3 is reduced in pressure by the electronic expansion valve and mixed with the low-pressure refrigerant at the outlet of the indoor auxiliary heat exchanger 11 to enter 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 at the outlet of the outdoor heat exchanger 5 is mixed with the low-temperature gaseous refrigerant at the outlet of the cold end 102 of the vortex tube 10, and then flows into the liquid storage tank 6 and the inlet of the compressor 1 through the one-way valve 15. At this time, the control valve 16 is closed to prevent the low-temperature refrigerant flowing through the one-way valve 15 from flowing back into the four-way reversing valve 2.

[0054] During heating, by controlling the flow direction of the 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, thereby reducing the heat loss in the four-way reversing valve 2 and increasing the inlet temperature of the indoor heat exchanger 3, so that the heat exchanger can be heated quickly to achieve rapid heating.

[0055] The working principle of the vortex tube is described as follows: the high-pressure compressor exhaust gas enters tangentially from the inlet of the vortex tube 10, expands in the vortex tube and performs 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 the angular velocity 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, the temperature increases, and flows out from the hot end outlet of the vortex tube; the central fluid loses energy, the temperature decreases, and flows out from the cold end outlet of the vortex tube in the opposite direction, which can quickly achieve hot and cold separation.

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

[0057] When heating, the high-temperature gaseous refrigerant discharged from the compressor and the low-temperature refrigerant at the outlet of the outdoor heat exchanger are prevented from exchanging heat in the four-way reversing valve, which can increase the inlet temperature of the indoor heat exchanger, thereby achieving rapid heating. When heating, part of the compressor exhaust enters the vortex tube, and after the cold and hot separation, the refrigerant with a higher temperature at the hot end outlet enters the indoor auxiliary heat exchanger, quickly raising the tube temperature and reducing the cold wind protection time.

[0058] Embodiment 2:

[0059] like Figure 2As shown, during cooling, the four-way valve is reversed, and the high-temperature gaseous refrigerant at the outlet of the compressor 1 enters the four-way reversing valve 2 through the first refrigerant branch. At this time, the control valve 13 is opened, and the control valve 14 is closed. The refrigerant enters the outdoor heat exchanger 5 for condensation, and the condensed liquid refrigerant enters the indoor heat exchanger 3 for evaporation after being depressurized by the electronic expansion valve 4. At this time, the one-way valve 12 prevents the refrigerant from flowing into the indoor auxiliary heat exchanger 11. The refrigerant at the outlet of the indoor heat exchanger 3 enters the liquid storage tank 6 and the inlet of the compressor 1 through the four-way valve 2. At this time, the control valve 9 is closed and the control valve 16 is opened to prevent the refrigerant from entering the vortex tube 10. The one-way valve 15 prevents the refrigerant from flowing back.

[0060] The air-conditioning system of the present invention avoids heat exchange between the high-temperature gaseous refrigerant discharged from the compressor and the low-temperature refrigerant at the outlet of the outdoor heat exchanger in the four-way reversing valve during heating, and 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, and after cold and hot separation, the refrigerant with a higher temperature at the hot end outlet enters the indoor auxiliary heat exchanger, which quickly increases the tube temperature and reduces the cold wind protection time.

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

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

[0063] When the operation mode of the air conditioner is the heating mode, the control valves on the third refrigerant branch and the second refrigerant branch are controlled to be closed, and the control valves on the auxiliary heating branch and the isolation branch are controlled to be opened, so as to form a fast heating mode in which the high-temperature refrigerant flows through the four-way reversing valve and the low-temperature refrigerant flows back to the compressor through the isolation branch; specifically, the reversing four-way valve 2 is controlled to be in the first connected state, the control valve 13 and the control valve 16 are closed, and the control valve 9 and the control valve 14 are opened. The schematic diagram of the first connected state of the four-way reversing valve is shown in FIG. Figure 4 shown.

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

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

[0066] First of all, it should be explained here that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0067] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0072] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A refrigerant control flow path, characterized in that: It includes a four-way reversing valve, a first refrigerant branch, a second refrigerant branch, a third refrigerant branch, and an isolation branch; wherein: 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 and then is 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 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 arranged on the second refrigerant branch, the third refrigerant branch and the isolation branch, which control the opening and closing of the control valves at different positions to achieve the reflux of low-temperature refrigerant without passing 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 located 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 located 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 provided 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 is connected to the second refrigerant branch located at the outlet side of the electronic expansion valve after passing through the indoor auxiliary heat exchanger.

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. The first auxiliary branch is provided with a control valve; 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; 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 provided on the isolation branch.

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

9. An air conditioning system, characterized in that: It comprises a refrigerant control flow path as described in any one of claims 1-8.

10. A control method, characterized in that: Used to control the refrigerant control flow path as described in any one of claims 1 to 8, the control method comprises the following steps: Get the operating mode of the air conditioner; When the operation mode of the air conditioner is the heating mode, the control valves on the third refrigerant branch and the second refrigerant branch are controlled to be closed, and the control valves on the auxiliary heating branch and the isolation branch are controlled to be opened, so as to form a fast heating mode in which the high-temperature refrigerant flows through the four-way reversing valve and the low-temperature refrigerant flows back to the compressor through the isolation branch; When the air conditioner operates in cooling mode, the control valves on the third refrigerant branch and the second refrigerant branch are controlled to open, and the control valves on the auxiliary heating branch and the isolation branch are controlled to close, so as to form a conventional cooling mode in which both the high-temperature refrigerant flow and the low-temperature refrigerant flow through the four-way reversing valve.

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