Automatic reversing valve, air conditioner heat pump system and regulation and control method

Abstract

The invention belongs to the technical field of air conditioner heat pumps, and particularly relates to an automatic reversing valve, an air conditioner heat pump system and a regulation and control method. Comprising a compressor, an electromagnetic four-way reversing valve, a first heat exchanger, a second heat exchanger, a throttling mechanism and an automatic reversing valve which jointly form refrigerant circulation, and the dual purposes of refrigeration cooling and heat pump heating are achieved. The automatic reversing valve comprises a valve body, a piston, a communicating vessel, a connector and a limiting piece. The piston divides the valve body into a left cavity and a right cavity. Four interfaces and a communicating vessel are sequentially arranged in each cavity from left to right; and the two connectors are covered by the communicating vessel and are arranged on the valve body. The automatic reversing valve ensures that the flowing direction of refrigerants in the first heat exchanger and the second heat exchanger and the flowing direction of heat exchange media in the first heat exchanger and the second heat exchanger are always in a reverse flow state no matter in a refrigeration working condition or a heating working condition in the air conditioner heat pump system, and the temperature changing characteristic of non-azeotropic refrigerants is fully utilized; and meanwhile, efficient and energy-saving under the refrigerating working condition and the heating working condition are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air-conditioning heat pumps, and in particular relates to an automatic reversing valve, an air-conditioning heat pump system and a control method. Background Art

[0002] Current air conditioning heat pump units (such as room air conditioners, unitary air conditioners, and multi-split units) often need to achieve dual cooling in the summer and heating in the winter, achieving multifunctionality. This multifunctionality is particularly important in the current climate of energy conservation and emission reduction. In the past, the refrigerants used in air conditioning heat pump systems were mostly single refrigerants, and even mixed refrigerants were azeotropic refrigerants. These refrigerants all have a one-to-one correspondence between saturation pressure and saturation temperature. When switching between cooling and heating, the heat pump system has only one phase transition temperature at a given pressure, minimizing the impact on system performance. Due to the impacts of factors such as ozone depletion and the greenhouse effect on refrigerants, there is an increasing demand for non-azeotropic refrigerants. A common characteristic of non-azeotropic refrigerants is that they all exhibit a glide temperature, meaning that the phase transition temperature (evaporation or condensation temperature) varies under a given pressure. These refrigerants can have good system performance when used for cooling or heating alone. However, when used in heat pump refrigeration systems that require both cooling and heating, in one operating condition, the refrigerant and the heat exchange medium exchange heat in countercurrent flow, resulting in better system performance. In the other operating condition, the refrigerant and the heat exchange medium exchange heat in cocurrent flow, resulting in a sharp drop in system performance. This significantly reduces the annual performance coefficient of the air conditioning heat pump system and increases energy consumption.

[0003] In order to solve the impact on system performance caused by the conversion of cooling and heating operating conditions, the patent application number CN201620134068.3 proposes a method of adding eight one-way valves to the air-conditioning heat pump system. Although it solves the problem of the system heat exchange changing from countercurrent heat exchange to forward heat exchange caused by the conversion of cooling and heating operating conditions, the addition of more valves also brings about problems of system complexity, increased flow resistance and increased cost. Summary of the Invention

[0004] The object of the present invention is to provide an automatic reversing valve, an air conditioning heat pump system and a control method, by which the flow direction of the refrigerant is regulated by moving the piston of the automatic reversing valve, so that the flow direction of the refrigerant in the first heat exchanger and the flow direction of the heat exchange medium are generally always in a countercurrent state, thereby achieving high efficiency and energy saving in cooling and heating conditions.

[0005] To achieve the above-mentioned object, the present invention provides an automatic reversing valve, comprising a valve body, a piston disposed in the valve body, two communicating vessels, at least one connector, and two limit members;

[0006] The piston is movably disposed in the valve body, dividing the valve body into two left and right cavities; each cavity is provided with four interfaces and a communicating vessel from left to right; the connector is used to connect the piston and the two communicating vessels, and each end of the connector is connected to one of the limit members;

[0007] The communicating vessel is used to connect two adjacent interfaces in each cavity and separate them from the other two interfaces; the cross-sectional area of the limiting member is smaller than the cross-sectional area of the valve body;

[0008] The distance between the two limiting members is smaller than the length of the valve body, and is used for the piston to drive the connector and the communicating vessel to move in the valve body, so that the two interfaces connected by the communicating vessel change.

[0009] Furthermore, at least three adjacent interfaces in each cavity are arranged on the same side wall of the valve body, and the distance between two adjacent interfaces in each cavity is equal.

[0010] Furthermore, the communicating vessel is a cover structure, the length of which is greater than the distance between the farthest ends of two adjacent interfaces in each cavity, and less than the sum of the distance between the farthest ends of two adjacent interfaces and the distance between two adjacent interfaces;

[0011] The difference between the length of the valve body and the distance between the two limiting members is greater than the width of each of the interfaces and smaller than the sum of the width of each interface and the distance between two adjacent interfaces.

[0012] The present invention also provides an air conditioning heat pump system, comprising: a compressor, an electromagnetic four-way reversing valve, a first heat exchanger, a throttling mechanism, a second heat exchanger, and the automatic reversing valve described in any one of the above;

[0013] The electromagnetic four-way reversing valve includes a first port, a second port, a third port and a fourth port, wherein the first port is connected to the discharge port of the compressor, and the third port is connected to the suction port of the compressor;

[0014] The second port is connected to the inlet end of the first heat exchanger through the left cavity of the automatic reversing valve, and the outlet end of the first heat exchanger is connected to the right cavity of the automatic reversing valve through the left cavity of the automatic reversing valve and the throttling mechanism in sequence;

[0015] The remaining three interfaces of the right cavity are respectively connected to the inlet end, the outlet end and the fourth port of the second heat exchanger;

[0016] The connection method of the connecting vessel and the eight interfaces of the automatic reversing valve satisfies the following requirements: when the limit member moves to the leftmost or rightmost side of the valve body under the action of the pressure difference of the refrigerant discharged from the compressor, the flow direction of the refrigerant in the first heat exchanger and the second heat exchanger remains unchanged.

[0017] Furthermore, the left and right cavities of the automatic reversing valve include, from left to right, interface a, interface b, interface c, interface d, interface e, interface f, interface g, and interface h;

[0018] The second port is connected to the port a of the left cavity, the port b is connected to the fifth port of the first heat exchanger, the sixth port of the first heat exchanger is connected to the port d, and the port c is connected to the seventh port of the throttling mechanism;

[0019] The eighth port of the throttling mechanism is connected to the port f of the right cavity, the port g is connected to the ninth port of the second heat exchanger, the tenth port of the second heat exchanger is connected to the port e, and the port h is connected to the fourth port;

[0020] When the limiter moves to the leftmost side of the valve body, the communicating vessel of the left cavity connects interfaces b and c, and the communicating vessel of the right cavity connects interfaces e and f; when the limiter moves to the rightmost side of the valve body, the communicating vessel of the left cavity connects interfaces c and d, and the communicating vessel of the right cavity connects interfaces f and g.

[0021] Furthermore, the throttling structure is a throttle valve or a capillary tube, which is used to reduce the pressure of the refrigerant discharged from the compressor.

[0022] Furthermore, when the refrigerant is a non-azeotropic refrigerant, the air conditioning heat pump system further includes a regenerator, and the outlet end of the first heat exchanger is connected to the right cavity of the automatic reversing valve through the regenerator, the left cavity of the automatic reversing valve, and the throttling mechanism in sequence;

[0023] The outlet end of the second heat exchanger is connected to the left cavity of the automatic reversing valve through the regenerator, the right cavity of the automatic reversing valve and the throttling mechanism in sequence; it is used to exchange heat between the refrigerant of the first heat exchanger and the refrigerant of the second heat exchanger.

[0024] The present invention also provides a control method for the above-mentioned air-conditioning heat pump system, comprising: when in a cooling state, adjusting the electromagnetic four-way reversing valve so that the first port is connected to the second port, and the third port is connected to the fourth port;

[0025] The refrigerant vapor discharged from the compressor through the discharge port flows through the first and second ports to the left chamber of the automatic reversing valve. Under the action of pressure, the piston drives the communicating tube to the right. The refrigerant vapor then flows from the automatic reversing valve into the first heat exchanger, where it exchanges heat with the ambient medium in countercurrent flow and is cooled into refrigerant liquid. After flowing out, it flows through the left chamber of the automatic reversing valve and into the throttling mechanism to reduce the pressure and become a gas-liquid two-phase refrigerant.

[0026] Then it flows into the second heat exchanger through the right cavity of the automatic reversing valve, performs countercurrent heat exchange with the cooled medium, and the gas-liquid two-phase refrigerant absorbs heat and vaporizes into refrigerant vapor. After flowing out, it flows into the fourth port of the electromagnetic four-way reversing valve through the right cavity of the automatic reversing valve, and returns to the compressor through the third port and the suction port.

[0027] Furthermore, the control method includes: when in a heating state, adjusting the electromagnetic four-way reversing valve so that the first port is connected to the fourth port, and the third port is connected to the second port;

[0028] The refrigerant vapor discharged from the compressor through the discharge port flows through the first port and the fourth port to the right chamber of the automatic reversing valve. Under the action of pressure, the piston drives the communicating vessel to move to the left. The refrigerant vapor then flows from the automatic reversing valve into the second heat exchanger, where it exchanges heat with the heated medium in countercurrent flow and is cooled and condensed into refrigerant liquid. After flowing out, it flows through the right chamber of the automatic reversing valve and into the throttling mechanism to reduce the pressure into gas-liquid two-phase refrigerant.

[0029] Then it flows into the first heat exchanger through the left cavity of the automatic reversing valve, undergoes countercurrent heat exchange with the ambient medium, absorbs heat and vaporizes into refrigerant vapor, flows out again through the left cavity of the automatic reversing valve and flows into the second port of the electromagnetic four-way reversing valve, and returns to the compressor through the third port and the suction port.

[0030] Furthermore, when the refrigerant is a non-azeotropic refrigerant and is in a refrigeration condition, the refrigerant vapor is cooled into a refrigerant liquid through countercurrent heat exchange with the ambient medium in the first heat exchanger, and then passes through the regenerator for countercurrent heat exchange with the refrigerant vapor flowing out of the second heat exchanger. The refrigerant liquid is further cooled and then flows into the throttling mechanism through the left cavity of the automatic reversing valve; the refrigerant vapor flowing out of the second heat exchanger absorbs further heat after countercurrent heat exchange in the regenerator, and then flows into the fourth port of the electromagnetic four-way reversing valve through the right cavity of the automatic reversing valve;

[0031] When the refrigerant is a non-azeotropic refrigerant and is in a heating condition, the refrigerant vapor is cooled and condensed into a refrigerant liquid after countercurrent heat exchange with the heated medium in the second heat exchanger, and then countercurrent heat exchange is carried out with the refrigerant vapor flowing out of the first heat exchanger through the regenerator. The refrigerant liquid is further cooled and then flows into the throttling mechanism through the right cavity of the automatic reversing valve; the refrigerant vapor flowing out of the first heat exchanger further absorbs heat after countercurrent heat exchange in the regenerator, and then flows into the second port of the electromagnetic four-way reversing valve through the left cavity of the automatic reversing valve.

[0032] In general, the above technical solutions conceived by the present invention have the following technical advantages compared with the existing technology:

[0033] 1. The present invention provides an automatic reversing valve, which uses a piston to separate the valve body into two left and right cavities. Each cavity is provided with four interfaces and a communication vessel. The pressure difference on both sides of the piston enables the piston to move adaptively, thereby driving the communication vessel to move, thereby changing the position of the two interfaces covered by the communication vessel. This allows the flow path of the medium after passing through the automatic reversing valve to change without changing the communication channel at the other end of the interface. This ensures that the connection direction of the medium flowing out of the automatic reversing valve and the connected external channel remains unchanged when the piston moves to the right or left. This arrangement is particularly suitable for air conditioning heat pump systems, and can ensure that the flow direction of the heat exchange medium in the air conditioning heat pump system is always in a countercurrent state under both cooling and heating conditions, thereby improving the heat exchange effect.

[0034] 2. The air conditioning heat pump system provided by the present invention adopts an improved automatic reversing valve, so that the flow direction of the heat exchange medium is always in a countercurrent state under both cooling and heating conditions, thereby obtaining the maximum heat transfer temperature difference, improving system efficiency, and helping to achieve more significant energy-saving benefits.

[0035] 3. The air conditioning heat pump system provided by the present invention is particularly suitable for air conditioning heat pump systems using refrigerants with temperature glide (i.e., non-azeotropic refrigerants). It automatically adjusts direction by driving the pressure difference, conforming to the temperature change characteristics of the mixed refrigerant with temperature glide, thereby achieving the maximum heat transfer temperature difference and improving system efficiency. The present invention can overcome the problem that when existing refrigeration systems use mixed refrigerants with temperature glide, when switching between cooling and heating conditions, the flow direction of the refrigerant in the first heat exchanger and the second heat exchanger in one condition can only be guaranteed to be in a countercurrent state with the flow direction of the heat exchange medium. It also overcomes the problems of system complexity, increased flow resistance, and significant cost increase brought about by the patent solution with application number CN201620134068.3. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the automatic reversing valve of the present invention.

[0037] Figure 2 This is a schematic diagram of the connection and operation of the cooling condition of an air-conditioning heat pump system using an automatic reversing valve.

[0038] Figure 3 This is a schematic diagram of the connection and operation of the heating system of an air-conditioning heat pump system using an automatic reversing valve.

[0039] Figure 4 This is a schematic diagram of the connection and operation of the cooling condition of an air conditioning heat pump system using an automatic reversing valve and a regenerator.

[0040] Figure 5 This is a schematic diagram of the connection and operation of the heating system of an air conditioning heat pump system that uses an automatic reversing valve and a regenerator.

[0041] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0042] 1-valve body; 2-piston; 3-connecting vessel; 4-connector; 5-limiting member; 6-second heat exchanger; 7-compressor; 8-electromagnetic four-way reversing valve; 9-first heat exchanger; 10-throttling mechanism; 11-regenerator; 61-ninth port; 62-tenth port; 71-intake port; 72-exhaust port; 81-first port; 82-second port; 83-third port; 84-fourth port; 91-fifth port; 92-sixth port; 101-seventh port; 102-eighth port; 111-port one; 112-port two; 113-port three; 114-port four. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0044] The embodiments of the concepts of the present invention may be modified in various ways and in various forms. Therefore, specific embodiments are shown in the drawings and described in detail in this specification or application. However, this does not limit the embodiments of the concepts of the present invention to the specific disclosed forms. Instead, the embodiments should be understood to include all modifications, equivalents, and alternatives within the scope of the present invention.

[0045] Translation

[0046] Although terms such as "first" and "second" may be used to describe various components, the components are not limited to these terms. These terms are only used to distinguish one component from another. For example, without departing from the scope of protection of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0047] Directional terms such as "upper," "lower," "left," and "right" are used in this disclosure to describe various exemplary structural components and elements of the disclosure. However, these terms are used for illustrative purposes only and are based on the exemplary orientations shown in the accompanying drawings. Because the disclosed embodiments of the disclosure can be arranged in various orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting.

[0048] See also Figure 1 The present invention provides an automatic reversing valve, comprising a valve body 1, a piston 2 arranged in the valve body 1, two communicating vessels 3, at least one connector 4 and two limit members 5.

[0049] Wherein, the piston 2 is movably arranged in the valve body 1, dividing the valve body 1 into two left and right cavities, and sealing the two cavities; each cavity is provided with four interfaces (respectively, the left cavity interfaces a, b, c, d, and the right cavity interfaces e, f, g, h) and a communicating vessel 3 from left to right; the connector 4 is used to connect the piston 2 and the two communicating vessels 3, and the two ends of the connector 4 are respectively connected to a limiting member 5; the distance L2 between the two limiting members 5 is less than the length L1 of the valve body 1, and is used for the piston 2 to drive the connector 4 and the communicating vessel 3 to move in the valve body 1, so that the positions of the two interfaces connected to the communicating vessel 3 change, thereby changing the flow direction of the medium. The limiting member 5 of the present invention is a structure integrally formed with the two ends of the connector 4 or an independent structure, fixed to the two ends of the connector 4 by bolts, welding, etc., as long as the two ends of the connector 4 can be abutted against the left and right inner walls of the valve body 1.

[0050] The communicating vessel 3 is used to connect two adjacent interfaces in each cavity and separate them from the other two interfaces, that is, the internal space of the communicating vessel 3 is not connected with the internal space of the cavity of the valve body 1.

[0051] The cross-sectional area of the stopper 5 is smaller than that of the valve body 1, so that the stopper 5 does not isolate the space on either side of the stopper 5. The valve body 1 is separated into two compartments, the left and right, by the piston 2. Specifically, the stopper 5 is located at each end of the connector, primarily serving to limit the position of the valve core during operation. It also works with the piston 2 to support the connector 4 and guide the valve core during operation. When the piston 2 is able to independently guide and support the connector 4, the stopper 5 only serves to limit the position.

[0052] In particular, at least three adjacent interfaces in each cavity are arranged on the same side wall of the valve body 1, and the distance between two adjacent interfaces in each cavity is equal, so that the communicating vessel 3 can connect two of the three adjacent interfaces by moving, and one of the four interfaces is always uncovered, so that the interface is connected to the external high-pressure or low-pressure medium.

[0053] The manifold 3 is a cover structure that covers two adjacent interfaces and allows the medium to flow within the internal space of the cover. The edge of the cover is sealed against the inner wall where the interfaces are located, thereby isolating the interior of the cover from the inner cavity of the valve body 1. Alternatively, the interfaces extend inwardly into the cavity of the valve body 1, and support plates are provided around the peripheral wall of the interface ends. At the same time, matching support plates are also provided on the edge of the cover of the manifold 3, so that when the manifold 3 moves, the support parts abut against each other to form a sealed structure of the cover. The length L5 of the manifold 3 is greater than the distance L4 between the farthest ends of the two adjacent interfaces in each cavity, and less than the sum of the distance L4 between the farthest ends of the two adjacent interfaces and the distance L3 between the two adjacent interfaces, so that the manifold 3 only covers and connects two interfaces at a time.

[0054] The connector 4 is an integrally formed connecting structure, such as a connecting rod, which passes through the middle of the piston 2 for fixing, with limit members 5 connected at both ends, and the communicating vessel 3 is fixed at the middle position of the connector 4 on both sides of the piston 2; or the connector 4 is two independent connecting structures, which are respectively fixed on the left and right sides of the piston 2.

[0055] The difference between the length L1 of the valve body 1 and the distance L2 between the two limit members 5 is greater than the width L6 of each interface, and less than the sum of the width L6 of each interface and the distance L3 between two adjacent interfaces, so that each time the limit member 5 moves to the left or right to the bottom, only one of the two interfaces connected in the communicating vessel 3 changes, that is, one of the interfaces is always located in the cavity covered by the communicating vessel 3.

[0056] In particular, the piston 2 is located in the middle of the connector 4 , that is, the distances from the limiting members 5 at both ends are equal.

[0057] When the spaces on both sides of the piston 2 are connected to the high-pressure side gas and the low-pressure side gas of the air-conditioning heat pump system respectively, the valve core moves under the action of the pressure difference on both sides of the piston 2; there are two communicating vessels 3, one on each side of the piston 2. When the valve core moves, the two corresponding interfaces on the valve body 1 are connected, but the internal space of the communicating vessel 3 and the internal space of the valve body 1 are sealed and not connected.

[0058] See also Figure 2 and 3 , the present invention also provides an air conditioning heat pump system, comprising: a compressor 7, an electromagnetic four-way reversing valve 8, a first heat exchanger 9, a throttling mechanism 10, a second heat exchanger 6 and the automatic reversing valve described above;

[0059] The electromagnetic four-way reversing valve 8 includes a first port 81, a second port 82, a third port 83 and a fourth port 84. The first port 81 is connected to the discharge port 72 of the compressor 7, and the third port 83 is connected to the intake port 71 of the compressor 7.

[0060] The second port 82 is connected to the inlet end of the first heat exchanger 9 through the left cavity of the automatic reversing valve, and the outlet end of the first heat exchanger 9 is connected to the right cavity of the automatic reversing valve through the left cavity of the automatic reversing valve and the throttling mechanism 10 in sequence;

[0061] The remaining three interfaces of the right cavity are respectively connected to the inlet and outlet of the second heat exchanger 6 and the fourth port 84;

[0062] The connection method of the connecting vessel 3 and the eight interfaces of the automatic reversing valve satisfies the following requirements: when the limit member 5 moves to the leftmost or rightmost side of the valve body under the action of the pressure difference of the refrigerant discharged from the compressor 7, the flow direction of the refrigerant in the first heat exchanger 9 and the second heat exchanger 6 remains unchanged.

[0063] The first heat exchanger 9 is used for exchanging heat between the refrigerant and one medium, and the second heat exchanger 6 is used for exchanging heat between the refrigerant and another medium; the compressor 7, the first heat exchanger 9, the throttling mechanism 10, the second heat exchanger 6 and the automatic reversing valve are connected in sequence to form a refrigerant cycle for the refrigerant to flow.

[0064] Specifically, the left and right cavities of the automatic reversing valve include, from left to right, interface a, interface b, interface c, interface d, interface e, interface f, interface g, and interface h; the first heat exchanger 9 includes a fifth port 91 and a sixth port 92, which are the inlet and outlet ends, respectively; the second heat exchanger 6 includes a ninth port 61 and a tenth port 62, which are the inlet and outlet ends, respectively; the throttling mechanism 10 includes a seventh port 101 and an eighth port 102.

[0065] The second port 82 is connected to the port a of the left cavity, the port b is connected to the fifth port 91 of the first heat exchanger 9, the sixth port 92 of the first heat exchanger 9 is connected to the port d, and the port c is connected to the seventh port 101 of the throttling mechanism 10;

[0066] The eighth port 102 of the throttling mechanism 10 is connected to the port f of the right cavity, the port g is connected to the ninth port 61 of the second heat exchanger 6, the tenth port 62 of the second heat exchanger 6 is connected to the port e, and the port h is connected to the fourth port 84;

[0067] When the limiter 5 moves to the leftmost side of the valve body, the communicating vessel 3 of the left cavity connects interfaces b and c, and the communicating vessel 3 of the right cavity connects interfaces e and f; when the limiter 5 moves to the rightmost side of the valve body, the communicating vessel 3 of the left cavity connects interfaces c and d, and the communicating vessel 3 of the right cavity connects interfaces f and g.

[0068] The throttling structure 10 is a throttle valve or a capillary tube, and is used to reduce the pressure of the refrigerant discharged from the compressor 7 .

[0069] The working process of the system's refrigeration condition is as follows:

[0070] like Figure 2 As shown in FIG. 1 , a connection diagram of the cooling condition of the air conditioning heat pump system using the automatic reversing valve provided by the embodiment of the present invention is shown. At this time, the first port 81 of the electromagnetic four-way reversing valve 8 is connected to the second port 82, the third port 83 of the electromagnetic four-way reversing valve 8 is connected to the fourth port 84, and the valve core of the automatic reversing valve is in Figure 2The high-temperature and high-pressure refrigerant vapor discharged from the compressor 7 through the discharge port 72 passes through the first port 81-second port 82 interface connected by the electromagnetic four-way reversing valve 8 and is connected to the interface a of the automatic reversing valve, and then enters the first heat exchanger 9 through the interface b of the automatic reversing valve and the fifth port 91 of the first heat exchanger 9. In the first heat exchanger 9, it exchanges heat with the ambient medium in countercurrent, is cooled and condensed into refrigerant liquid, flows out from the sixth port 92 of the first heat exchanger 9, passes through the interface d and the interface c of the automatic heat exchanger in sequence, flows into the seventh port 101 of the throttling mechanism 10, is throttled and reduced in pressure by the throttling mechanism 10 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then flows out of the throttling mechanism 10 through the eighth port 102, and then passes through the The refrigerant enters the second heat exchanger 6 through the interfaces f and g of the automatic reversing valve and the ninth port 61 of the second heat exchanger 6, and performs countercurrent heat exchange with the cooled medium in the second heat exchanger 6. The refrigerant absorbs heat and vaporizes into refrigerant vapor, and flows out through the tenth port 62 of the second heat exchanger 6. Then the refrigerant vapor flows out of the automatic reversing valve through the interfaces e and h of the automatic reversing valve in turn, passes through the fourth port 84 and the third port 83 of the electromagnetic four-way reversing valve, and returns to the compressor 7 from the intake port 71 of the compressor 7, thereby completing a refrigeration cycle including countercurrent heat exchange in the first heat exchanger 9 and the second heat exchanger 6, and achieving the purpose of cooling the refrigerant medium or the space that needs to be refrigerated in the second heat exchanger 6.

[0071] Since, under refrigeration conditions, the interface a of the automatic reversing valve is directly connected to the second port 82 of the electromagnetic four-way reversing valve 8, the refrigerant that enters the space on the left side of the automatic reversing valve through the interface a of the automatic reversing valve is a high-temperature, high-pressure refrigerant. Thus, the space on the left side of the piston 2 of the automatic reversing valve is high pressure, while the interface h of the automatic reversing valve is directly connected to the fourth port 84 of the electromagnetic four-way reversing valve 8, and is connected to the suction port 71 of the compressor 7 through the third port 83 of the electromagnetic four-way reversing valve 8. Thus, the space on the right side of the piston 2 of the automatic reversing valve is low pressure. Under the action of the pressure difference on both sides of the piston 2 of the automatic reversing valve, the valve core of the automatic reversing valve is pushed to the right until the limiter 5 on the right side of the automatic reversing valve reaches the rightmost position of the valve body of the automatic reversing valve, as shown in FIG. Figure 2 shown.

[0072] The working process of the heat pump heating condition of this system is as follows:

[0073] like Figure 3 As shown in the figure, the connection and working diagram of the heating condition of the air conditioning heat pump system using the automatic reversing valve provided by the embodiment of the present invention. At this time, the first port 81 of the electromagnetic four-way reversing valve 8 is connected to the fourth port 84, the second port 82 of the electromagnetic four-way reversing valve 8 is connected to the third port 83, and the valve core of the automatic reversing valve is in Figure 3The high-temperature and high-pressure refrigerant vapor discharged from the compressor 7 through the discharge port 72 passes through the first port 81-fourth port 84 interface connected to the electromagnetic four-way reversing valve 8 and is connected to the interface h of the automatic reversing valve, and then enters the second heat exchanger 6 through the interface g of the automatic reversing valve and the ninth port 61 of the second heat exchanger 6. In the second heat exchanger 6, it exchanges heat with the heated medium in countercurrent, is cooled and condensed into a high-pressure refrigerant liquid, and then flows out from the tenth port 62 of the second heat exchanger 6, passes through the interfaces e and f of the automatic heat exchanger in sequence, flows into the eighth port 102 of the throttling mechanism 10, is throttled and reduced in pressure by the throttling mechanism 10 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then flows out of the seventh port 101 of the throttling mechanism 10, and then flows out of the throttling mechanism 10 in accordance with the following formula: The refrigerant passes through the interface c and interface b of the automatic reversing valve and the fifth port 91 of the first heat exchanger 9, and performs countercurrent heat exchange with the ambient medium in the first heat exchanger 9. The refrigerant absorbs heat and vaporizes into refrigerant vapor, and flows out through the sixth port 92 of the first heat exchanger 9. Then the refrigerant vapor flows out of the automatic reversing valve through the interface d and interface a of the automatic reversing valve in turn, passes through the second port 82 and the third port 83 of the electromagnetic four-way reversing valve 8, and returns to the compressor 7 through the intake port 71 of the compressor 7, thereby completing a heat pump cycle including countercurrent heat exchange in the first heat exchanger 9 and the second heat exchanger 6, and achieving the purpose of heat pump heating for the medium that needs to be heated or the space that needs to be heated in the second heat exchanger 6.

[0074] Since, in the heat pump heating condition, the interface h of the automatic reversing valve is directly connected to the fourth port 84 of the electromagnetic four-way reversing valve 8, the refrigerant entering the space on the right side of the automatic reversing valve through the interface h of the automatic reversing valve is a high-temperature and high-pressure refrigerant. In this way, the space on the right side of the piston 2 of the automatic reversing valve is high-pressure, while the interface a of the automatic reversing valve is directly connected to the second port 82 of the electromagnetic four-way reversing valve 8, and is connected to the suction port 71 of the compressor 7 through the port 83 of the electromagnetic four-way reversing valve 8. In this way, the space on the left side of the piston 2 of the automatic reversing valve is low-pressure. Under the action of the pressure difference on both sides of the piston 2 of the automatic reversing valve, the valve core of the automatic reversing valve is pushed to the left until the limiter 5 on the left side of the automatic reversing valve reaches the leftmost position of the valve body of the automatic reversing valve, as shown in FIG. Figure 3 shown.

[0075] In summary, the present invention realizes the cooling and heating working conditions through the electromagnetic four-way reversing valve 8 and the automatic reversing valve, and ensures that whether in the cooling working condition or the heating working condition, the flow direction of the refrigerant in the first heat exchanger 9 and the second heat exchanger 6 and the flow direction of their respective heat exchange media are always in a countercurrent state as a whole, thereby making full use of the temperature-varying characteristics of the mixed refrigerant with temperature slip, satisfying the Lorentz temperature-varying heat source cycle, and achieving high efficiency and energy saving in the cooling and heating working conditions.

[0076] like Figure 4 and Figure 5The figure shows a connection and operation diagram of an air conditioning heat pump system with an automatic reversing valve and a regenerator, suitable for refrigerants with temperature glide (i.e., non-azeotropic refrigerants) provided by the present invention. The air conditioning heat pump system has both cooling and heating functions and includes a compressor 7, an electromagnetic four-way reversing valve 8, a first heat exchanger 9, a throttling mechanism 10, a second heat exchanger 6, an automatic reversing valve, and a regenerator 11. The first heat exchanger 9 is used to exchange heat between the refrigerant and one medium, the second heat exchanger 6 is used to exchange heat between the refrigerant and another medium, and the regenerator 11 is used to exchange heat between the high-pressure refrigerant liquid before throttling and the low-pressure refrigerant vapor before suction of the compressor 7, thereby achieving the purpose of subcooling the refrigerant liquid. The compressor 7, the first heat exchanger 9, the throttling mechanism 10, the second heat exchanger 6, the automatic reversing valve (composed of 1, 2, 3, 4, and 5), and the regenerator 11 are sequentially connected to form a refrigerant cycle for the flow of refrigerant.

[0077] The discharge port 72 of the compressor 7 is connected to the first port 81 of the electromagnetic four-way reversing valve 8 , and the third port 83 of the electromagnetic four-way reversing valve is connected to the intake port 71 of the compressor 7 .

[0078] The second port 82 of the electromagnetic four-way reversing valve 8 is connected to the automatic reversing valve port a, and the automatic reversing valve port b is connected to the fifth port 91 of the first heat exchanger 9. The sixth port 92 of the first heat exchanger 9 is connected to the fourth port 114 of the regenerator 11, and the third port 113 of the regenerator 11 is connected to the automatic reversing valve port d. The automatic reversing valve port c is connected to the seventh port 101 of the throttling mechanism 10.

[0079] The eighth port 102 of the throttling mechanism 10 is connected to the automatic reversing valve port f, and the automatic reversing valve port g is connected to the ninth port 61 of the second heat exchanger 6. The tenth port 62 of the second heat exchanger 6 is connected to the second port 112 of the regenerator 11, and the first port 111 of the regenerator 11 is connected to the automatic reversing valve port e. The automatic reversing valve port h is connected to the fourth port 84 of the electromagnetic four-way reversing valve 8. These connections constitute a complete refrigerant cycle.

[0080] The working process of the system's refrigeration condition is as follows:

[0081] like Figure 4 As shown in the figure, the connection and working diagram of the cooling condition of the air conditioning heat pump system using an automatic reversing valve and a regenerator provided by the embodiment of the present invention. At this time, the first port 81 of the electromagnetic four-way reversing valve 8 is connected to the second port 82, the third port 83 of the electromagnetic four-way reversing valve 8 is connected to the fourth port 84, and the valve core of the automatic reversing valve (composed of 1, 2, 3, 4, and 5) is in Figure 4The high-temperature and high-pressure refrigerant vapor discharged from the compressor 7 through the discharge port 72 passes through the first port 81-second port 82 interface of the electromagnetic four-way reversing valve 8 and is connected to the interface a of the automatic reversing valve, and then enters the first heat exchanger 9 through the interface b of the automatic reversing valve and the port 91 of the first heat exchanger 9. In the first heat exchanger 9, it exchanges heat with the ambient medium in countercurrent, is cooled and condensed into high-pressure refrigerant liquid, flows out from the sixth port 92 of the first heat exchanger 9, passes through the fourth port 114 of the regenerator 11, and enters the regenerator 11. 1, and in the regenerator 11, it performs countercurrent heat exchange with another low-temperature, low-pressure refrigerant vapor flowing out from the tenth port 62 of the second heat exchanger 6. After further cooling and subcooling, the high-pressure refrigerant liquid flows out through the third port 113 of the regenerator 11, and then flows into the seventh port 101 of the throttling mechanism 10 through the interface d and interface c of the automatic heat exchanger. After being throttled and reduced in pressure by the throttling mechanism 10, the low-temperature, low-pressure gas-liquid two-phase refrigerant flows out of the eighth port 102 of the throttling mechanism 10, and then passes through the automatic reversing mechanism 11 in sequence. The refrigerant enters the second heat exchanger 6 through the valve interface f, the automatic reversing valve interface g and the ninth port 61 of the second heat exchanger 6, and performs countercurrent heat exchange with the cooled medium in the second heat exchanger 6. The refrigerant absorbs heat and vaporizes into a low-temperature, low-pressure refrigerant, flows out from the tenth port 62 of the second heat exchanger 6, enters the regenerator 11 through the second port 112 of the regenerator 11, and performs countercurrent heat exchange with the high-pressure refrigerant liquid flowing from the fourth port 114 of the regenerator 11 in the regenerator 11, and is heated to become refrigerant vapor and flows out from the regenerator 11. The air flows out of the regenerator 11 through the port 111 of the electromagnetic four-way reversing valve 1, and then flows out of the automatic reversing valve through the port e and the port h of the automatic reversing valve in sequence, and then returns to the compressor from the suction port 71 of the compressor 7 through the port 4 84 to the port 3 83 of the electromagnetic four-way reversing valve, thereby completing a refrigeration cycle including the first heat exchanger 9, the second heat exchanger 6 and the regenerator 11 in which all are countercurrent heat exchangers, and achieving the purpose of cooling the medium to be refrigerated or the space to be refrigerated in the second heat exchanger 6.

[0082] Since, under refrigeration conditions, the interface a of the automatic reversing valve is directly connected to the second port 82 of the electromagnetic four-way reversing valve 8, the refrigerant that enters the space on the left side of the automatic reversing valve through the interface a of the automatic reversing valve is a high-temperature, high-pressure refrigerant. Thus, the space on the left side of the piston 2 of the automatic reversing valve is high pressure, while the interface h of the automatic reversing valve is directly connected to the fourth port 84 of the electromagnetic four-way reversing valve 8, and is connected to the suction port 71 of the compressor 7 through the third port 83 of the electromagnetic four-way reversing valve 8. Thus, the space on the right side of the piston 2 of the automatic reversing valve is low pressure. Under the action of the pressure difference on both sides of the piston 2 of the automatic reversing valve, the valve core of the automatic reversing valve is pushed to the right until the limiter 5 on the right side of the automatic reversing valve reaches the rightmost position of the valve body of the automatic reversing valve, as shown in FIG. Figure 4 shown.

[0083] The working process of the heat pump heating condition of this system is as follows:

[0084] like Figure 5 The figure shows the connection and operation diagram of the heat pump heating condition of the air conditioning heat pump system using an automatic reversing valve and a regenerator provided by the embodiment of the present invention. At this time, the first port 81 of the electromagnetic four-way reversing valve 8 is connected to the fourth port 84, the second port 82 of the electromagnetic four-way reversing valve 8 is connected to the third port 83, and the valve core of the automatic reversing valve (composed of 1, 2, 3, 4, and 5) is in Figure 5 The high-temperature and high-pressure refrigerant vapor discharged from the compressor 7 through the discharge port 72 passes through the first port 81-fourth port 84 interface of the electromagnetic four-way reversing valve 8 and is connected to the interface h of the automatic reversing valve, and then enters the second heat exchanger 6 through the interface g of the automatic reversing valve and the ninth port 61 of the second heat exchanger 6. In the second heat exchanger 6, it exchanges heat in countercurrent with the heated medium, is cooled and condensed into a high-pressure refrigerant liquid, and then flows out from the tenth port 62 of the second heat exchanger 6 and passes through the second port 11 of the regenerator 11. The refrigerant 12 enters the regenerator 11 and performs countercurrent heat exchange in the regenerator 11 with the low-temperature, low-pressure refrigerant vapor flowing out of the sixth port 92 of the first heat exchanger 9. After being further cooled and supercooled, the high-pressure refrigerant liquid flows out through the first port 111 of the regenerator 11, and flows into the second port 102 of the throttling mechanism 10 through the ports e and f of the automatic heat exchanger in sequence. After being throttled and reduced in pressure by the throttling mechanism 10, the low-temperature, low-pressure gas-liquid two-phase refrigerant flows out of the seventh port 101 of the throttling mechanism 10. Then, it passes through the interface c and interface b of the automatic reversing valve and the fifth port 91 of the first heat exchanger 9 in turn, enters the first heat exchanger 9, performs countercurrent heat exchange with the ambient medium in the first heat exchanger 9, and after absorbing heat and evaporating, flows out from the sixth port 92 of the first heat exchanger 9, enters the regenerator 11 through the port 4 114 of the regenerator 11, and performs countercurrent heat exchange with the high-pressure refrigerant liquid flowing from the port 2 112 of the regenerator 11 in the regenerator 11, and is heated to become refrigerant vapor and flows out of the regenerator 11. The air flows out of the regenerator 11 through the port 3 113, and then flows out of the automatic reversing valve through the port d and the port a of the automatic reversing valve in sequence, and returns to the compressor through the second port 82-the third port 83 of the electromagnetic four-way reversing valve 8 and the air intake 71 of the compressor 7, thereby completing a heat pump heating cycle including the first heat exchanger 9, the second heat exchanger 6 and the regenerator 11, all of which are countercurrent heat exchange. The purpose of heat pump heating of the medium to be heated or the space to be heated is achieved in the second heat exchanger 6.

[0085] Since, in the heat pump heating condition, the interface h of the automatic reversing valve is directly connected to the fourth port 84 of the electromagnetic four-way reversing valve 8, the refrigerant entering the space on the right side of the automatic reversing valve through the interface h of the automatic reversing valve is a high-temperature and high-pressure refrigerant. In this way, the space on the right side of the piston 2 of the automatic reversing valve is high-pressure, while the interface a of the automatic reversing valve is directly connected to the second port 82 of the electromagnetic four-way reversing valve 8, and is connected to the suction port 71 of the compressor 7 through the third port 83 of the electromagnetic four-way reversing valve 8. In this way, the space on the left side of the piston 2 of the automatic reversing valve is low-pressure. Under the action of the pressure difference on both sides of the piston 2 of the automatic reversing valve, the valve core of the automatic reversing valve is pushed to the left until the limit member 5 on the left side of the automatic reversing valve reaches the leftmost position of the valve body of the automatic reversing valve, as shown in FIG. Figure 5 shown.

[0086] In summary, the present invention realizes the cooling and heating working conditions through the electromagnetic four-way reversing valve 8 and the automatic reversing valve, and ensures that whether in the cooling condition or the heating condition, the flow direction of the refrigerant in the first heat exchanger 9 and the flow direction of their respective heat exchange media are generally always in a countercurrent state, ensuring that the two refrigerant fluids in the regenerator are always in a countercurrent state, thereby fully utilizing the temperature change characteristics of the mixed refrigerant with temperature slip, satisfying the Lorentz temperature change heat source cycle, and achieving high efficiency and energy saving in the cooling condition and the heating condition, thereby having a good energy saving effect throughout the year.

[0087] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic reversing valve, characterized in that: It comprises a valve body (1), a piston (2) arranged in the valve body (1), two communicating vessels (3), at least one connector (4) and two limiting members (5); The piston (2) is movably arranged in the valve body (1), dividing the valve body (1) into two left and right cavities; four interfaces and a communicating vessel (3) are sequentially provided in each cavity from left to right; the connector (4) is used to connect the piston (2) and the two communicating vessels (3), and the two ends of the connector (4) are respectively connected to one of the limiting members (5); The communicating vessel (3) is used to connect two adjacent interfaces in each cavity and separate them from the other two interfaces; The cross-sectional area of the limiting member (5) is smaller than the cross-sectional area of the valve body (1); The distance between the two limit members (5) is smaller than the length of the valve body (1), and is used for the piston (2) to drive the connector (4) and the communicating vessel (3) to move within the valve body (1), so that the two interfaces connected by the communicating vessel (3) change.

2. An automatic reversing valve according to claim 1, characterized in that: At least three adjacent interfaces in each cavity are arranged on the same side wall of the valve body (1), and the distance between two adjacent interfaces in each cavity is equal.

3. The automatic reversing valve according to claim 1, characterized in that: The communicating vessel (3) is a cover structure, and its length is greater than the distance between the farthest ends of two adjacent interfaces in each cavity, and less than the sum of the distance between the farthest ends of two adjacent interfaces and the distance between two adjacent interfaces; The difference between the length of the valve body (1) and the distance between the two limiting members (5) is greater than the width of each interface and less than the sum of the width of each interface and the distance between two adjacent interfaces.

4. An air conditioning heat pump system, characterized in that: include: A compressor (7), an electromagnetic four-way reversing valve (8), a first heat exchanger (9), a throttling mechanism (10), a second heat exchanger (6), and the automatic reversing valve according to any one of claims 1 to 3; The electromagnetic four-way reversing valve (8) comprises a first port (81), a second port (82), a third port (83) and a fourth port (84), wherein the first port (81) is connected to the discharge port (72) of the compressor (7), and the third port (83) is connected to the intake port (71) of the compressor (7); The second port (82) is connected to the inlet end of the first heat exchanger (9) through the left cavity of the automatic reversing valve, and the outlet end of the first heat exchanger (9) is connected to the right cavity of the automatic reversing valve through the left cavity of the automatic reversing valve and the throttling mechanism (10) in turn; The remaining three interfaces of the right cavity are respectively connected to the inlet end, the outlet end and the fourth port (84) of the second heat exchanger (6); The connection mode of the connecting vessel (3) and the eight interfaces of the automatic reversing valve satisfies the following conditions: when the limiting member (5) moves to the leftmost or rightmost side of the valve body (1) under the action of the pressure difference of the refrigerant discharged from the compressor (7), the flow direction of the refrigerant in the first heat exchanger (9) and the second heat exchanger (6) remains unchanged.

5. The air conditioning heat pump system according to claim 4, characterized in that: The left and right cavities of the automatic reversing valve include, from left to right, interface a, interface b, interface c, interface d, interface e, interface f, interface g, and interface h; The second port (82) is connected to the port a of the left cavity, the port b is connected to the fifth port (91) of the first heat exchanger (9), the sixth port (92) of the first heat exchanger (9) is connected to the port d, and the port c is connected to the seventh port (101) of the throttling mechanism (10); The eighth port (102) of the throttling mechanism (10) is connected to the port f of the right cavity, the port g is connected to the ninth port (61) of the second heat exchanger (6), the tenth port (62) of the second heat exchanger (6) is connected to the port e, and the port h is connected to the fourth port (84); When the position-limiting member (5) moves to the leftmost side of the valve body (1), the communicating vessel (3) of the left cavity connects interfaces b and c, and the communicating vessel (3) of the right cavity connects interfaces e and f; when the position-limiting member (5) moves to the rightmost side of the valve body (1), the communicating vessel (3) of the left cavity connects interfaces c and d, and the communicating vessel (3) of the right cavity connects interfaces f and g.

6. The air conditioning heat pump system according to claim 4, characterized in that: The throttling structure (10) is a throttling valve or a capillary tube, and is used to reduce the pressure of the refrigerant discharged from the compressor (7).

7. The air conditioning heat pump system according to any one of claims 4 to 6, characterized in that: The air conditioning heat pump system further comprises a regenerator (11), and the outlet end of the first heat exchanger (9) is connected to the right cavity of the automatic reversing valve through the regenerator (11), the left cavity of the automatic reversing valve and the throttling mechanism (10) in sequence; The outlet end of the second heat exchanger (6) is connected to the left cavity of the automatic reversing valve through the regenerator (11), the right cavity of the automatic reversing valve and the throttling mechanism (10) in sequence; it is used to exchange heat between the refrigerant of the first heat exchanger (9) and the refrigerant of the second heat exchanger (6).

8. A control method for an air conditioning heat pump system according to any one of claims 4 to 7, characterized in that: include: When in refrigeration mode, the electromagnetic four-way reversing valve (8) is adjusted so that the first port (81) is connected to the second port (82), and the third port (83) is connected to the fourth port (84); The refrigerant vapor discharged from the compressor (7) through the discharge port (72) flows to the left cavity of the automatic reversing valve through the first port (81) and the second port (82), and under the action of pressure, the piston (1) drives the communicating vessel (3) to move to the right; then the refrigerant vapor flows from the automatic reversing valve into the first heat exchanger (9), exchanges heat with the ambient medium in countercurrent flow, and is cooled into a refrigerant liquid; after flowing out, it flows into the throttling mechanism (10) through the left cavity of the automatic reversing valve and is reduced in pressure to become a gas-liquid two-phase refrigerant; Then, the refrigerant flows into the second heat exchanger (6) through the right cavity of the automatic reversing valve, performs countercurrent heat exchange with the cooled medium, and the gas-liquid two-phase refrigerant absorbs heat and vaporizes into refrigerant vapor. After flowing out, the refrigerant flows into the fourth port (84) of the electromagnetic four-way reversing valve (8) through the right cavity of the automatic reversing valve, and returns to the compressor (7) through the third port (83) and the air intake (71).

9. The control method of the air conditioning heat pump system according to claim 8, characterized in that: include: When in heating mode, the electromagnetic four-way reversing valve (8) is adjusted so that the first port (81) is connected to the fourth port (84), and the third port (83) is connected to the second port (82); The refrigerant vapor discharged from the compressor (7) through the discharge port (72) flows to the right cavity of the automatic reversing valve through the first port (81) and the fourth port (84), and under the action of pressure, the piston (1) drives the communicating vessel (3) to move to the left; then the refrigerant vapor flows from the automatic reversing valve into the second heat exchanger (6), exchanges heat with the heated medium in countercurrent, is cooled and condensed into refrigerant liquid, and then flows out and flows into the throttling mechanism (10) through the right cavity of the automatic reversing valve to reduce the pressure into a gas-liquid two-phase refrigerant; Then, the refrigerant flows into the first heat exchanger (9) through the left cavity of the automatic reversing valve, undergoes countercurrent heat exchange with the ambient medium, absorbs heat and vaporizes into refrigerant vapor, flows out again through the left cavity of the automatic reversing valve, flows into the second port (82) of the electromagnetic four-way reversing valve (8), and returns to the compressor (7) through the third port (83) and the air intake (71).

10. The control method of the air conditioning heat pump system according to claim 8, characterized in that: When the refrigerant is a non-azeotropic refrigerant and is in a refrigeration condition, the refrigerant vapor is cooled to a refrigerant liquid through countercurrent heat exchange with the ambient medium in the first heat exchanger (9), and then passes through the regenerator (11) for countercurrent heat exchange with the refrigerant vapor flowing out of the second heat exchanger (6). The refrigerant liquid is further cooled and then flows into the throttling mechanism (10) through the left cavity of the automatic reversing valve; the refrigerant vapor flowing out of the second heat exchanger (6) further absorbs heat after passing through the regenerator (11) for countercurrent heat exchange, and then flows into the fourth port (84) of the electromagnetic four-way reversing valve (8) through the right cavity of the automatic reversing valve; When the refrigerant is a non-azeotropic refrigerant and is in a heating condition, the refrigerant vapor is cooled and condensed into a refrigerant liquid after countercurrent heat exchange with the heated medium in the second heat exchanger (6), and then countercurrent heat exchange is performed with the refrigerant vapor flowing out of the first heat exchanger (9) through the reheater (11). The refrigerant liquid is further cooled and then flows into the throttling mechanism (10) through the right cavity of the automatic reversing valve; the refrigerant vapor flowing out of the first heat exchanger (9) absorbs heat after countercurrent heat exchange through the reheater (11), and then flows into the second port (82) of the electromagnetic four-way reversing valve (8) through the left cavity of the automatic reversing valve.

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