Reversing valve and air conditioner heat pump system

Abstract

The invention belongs to the technical field of refrigeration and heating equipment, and particularly relates to a reversing valve and an air conditioner heat pump system. Comprising a pressure driving assembly and a channel adjusting assembly. The channel adjusting assembly comprises a plurality of fluid channels, and each fluid channel comprises at least one fluid medium inlet and a fluid medium outlet; the fluid channels are separated by blocking elements; the pressure driving assembly comprises at least two cavities and a moving element used for blocking the two cavities, connectors serving as pressure driving channels are arranged in the two cavities respectively and used for generating pressure difference to drive the moving element to move, and the moving element is used for driving the blocking element to move so as to change the path of the fluid channel. According to the multi-way valve, the pressure difference serves as driving force, the valve element generates axial displacement or rotary motion, automatic switching of the working modes of the multi-way valve is achieved, and the working modes of a system are switched by switching the flow direction of fluid. And an automatic reversing function can be realized without extra electric energy or mechanical power input.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of refrigeration and heating equipment, and particularly relates to a reversing valve and an air-conditioning heat pump system. BACKGROUND

[0002] In the current field of refrigeration and heating equipment, especially in the heat pump air-conditioning system, the reversing valve is a key component for switching the flow direction of fluid. However, the traditional reversing valve (such as a four-way reversing valve) has certain limitations in structure and function, such as usually relying on electric or electromagnetic control, which not only increases the complexity and cost of the system, but also may lead to increased energy consumption and reduced system reliability. In addition, the traditional reversing valve has a limited number of interfaces, making it difficult to adapt to more complex system designs.

[0003] With the continuous development of heat pump air-conditioning technology and the promotion of system optimization design, higher requirements are put forward for the function and performance of the reversing valve. For example, the introduction of new components makes the pipe design of the system more complex, often requiring simultaneous control of the flow direction switching and distribution of multiple flow paths, which requires a reversing valve with more interfaces to meet the demand.

[0004] In this context, it is particularly important to develop a multi-way reversing valve that is simple in structure, does not require additional mechanical work input, and can automatically switch the flow direction of fluid. SUMMARY

[0005] The purpose of the present application is to provide a reversing valve and an air-conditioning heat pump system. This reversing valve not only meets the needs of complex system design, but also improves the overall performance and efficiency of the heat pump air-conditioning system.

[0006] To achieve the above-mentioned purpose, according to the first aspect of the present application, a reversing valve is provided, comprising: a pressure driving assembly and a channel adjusting assembly;

[0007] The channel adjusting assembly comprises a plurality of fluid channels, each fluid channel comprising at least one fluid medium inlet and one fluid medium outlet; each fluid channel is separated by a blocking element;

[0008] The pressure driving assembly comprises at least two cavities and a moving element for blocking the two cavities, and interfaces for pressure driving channels are respectively arranged in the two cavities for generating a pressure difference to drive the moving element to move, and the moving element is used to drive the blocking element to move, so as to change the path of the fluid channel.

[0009] Further, the pressure driving assembly comprises a valve body, end covers arranged at both ends of the valve body, a connecting piece and a piston part arranged in the valve body, the piston part separates the valve body into several cavities, each cavity is provided with a preset number of interfaces, two interfaces of which are used as interfaces of the pressure driving channel and are respectively connected with the inside of different cavities, the fluid channel and the blocking element of the channel adjusting assembly are arranged in the cavities, the blocking element is a slider part, the piston part and the slider part are fixedly connected with the connecting piece, the slider part is used for covering at least two interfaces in the cavity where the slider part is located;

[0010] When the pressure difference is generated between the two interfaces of the pressure driving channel, the piston part moves in the valve body and drives the slider part to move through the connecting piece, so as to change the position of the covered interfaces.

[0011] Further, the piston part is two, the two piston parts are respectively fixed at both ends of the connecting piece and form a first cavity in cooperation with the valve body, the two piston parts form a second cavity and a third cavity between the two piston parts and the two end covers respectively;

[0012] The first cavity is provided with a preset number of interfaces (for example, 2-16), one interface is connected with the second cavity through a first connecting pipe, another interface is connected with the third cavity through a second connecting pipe, and the interface is covered by the slider part, the slider part is fixed on the connecting piece and is used for moving under the driving of the piston part to cover different interfaces in the first cavity.

[0013] Further, the first cavity is provided with eight interfaces, the slider part is three, the second cavity and the third cavity drive the piston part to move under the action of the pressure difference, so as to change the position of the interfaces covered by the slider part and form different working states, and in any working state, only one interface of the two interfaces connected with the second cavity and the third cavity is not covered by the slider part, the three slider parts are respectively used for covering two adjacent interfaces to form a two-by-two connection structure.

[0014] Further, one of the two interfaces connected with the second cavity and the third cavity is arranged on one side of the first cavity, and the other seven interfaces are arranged on the other side, the connecting piece is a connecting plate provided with a through hole, the connecting plate is connected with the inner wall of the valve body to separate the first cavity from the second cavity and the third cavity, the interface of the two interfaces connected with the second cavity and the third cavity and not covered by the slider part is connected with the interface on the other side and not covered through the through hole.

[0015] Further, a limiting element is arranged in the second cavity and the third cavity or the cross-sectional diameter of the outer end part of the end cover is arranged to be smaller than the diameter of the piston part, so as to limit the two piston parts.

[0016] And / or, the interface and the slider component are provided with a valve seat for improving the sealing between the slider component and the valve body.

[0017] Further, the reversing valve is a rotary reversing valve, comprising a main valve, an actuator and a valve rod; the actuator and the valve rod constitute the pressure driving assembly, and the main valve constitutes the channel adjusting assembly.

[0018] The main valve comprises a valve body, a plurality of interfaces arranged around the peripheral wall of the valve body and a valve core arranged in the valve body, the valve core is matched with the interfaces to make two adjacent interfaces communicate to form a flow channel; and the valve core is fixedly connected with the valve rod.

[0019] The actuator is movably connected with the valve rod, used to drive the valve rod to rotate, and then drive the valve core to rotate, so as to change the position of the two communicated interfaces.

[0020] Further, the actuator is a pressure difference driving structure; the pressure difference driving structure comprises a shell and two push discs arranged in the shell, the push discs are in contact with the inner wall of the shell, and the two push discs divide the inner space of the shell into left, middle and right cavities; one straight rack is connected to one side of each of the two push discs towards the middle cavity, a gear matched with the straight rack is arranged on the valve rod, the valve rod passes through one side of the side wall of the shell, and the gear is engaged with the straight rack.

[0021] One interface is arranged in each of the left and right cavities, and the two interfaces are communicated through a third connecting pipe and communicated with one interface on the valve body; an interface is arranged in the middle cavity, and the interface is communicated with another interface on the valve body through a fourth connecting pipe.

[0022] In particular, the actuator can also be a motor driving structure.

[0023] Further, eight interfaces are uniformly arranged on the peripheral wall of the valve body; two adjacent interfaces form a communicated flow channel under the separation of the valve core.

[0024] According to a third aspect of the present application, the application provides a use of the above-mentioned reversing valve in an air-conditioning heat pump system.

[0025] According to a fourth aspect of the present application, the application provides an air-conditioning heat pump system, comprising an ejector, a first indoor heat exchanger, a second indoor heat exchanger, a fan, a gas-liquid separator, an outdoor heat exchanger, a compressor, a throttling valve, a four-way reversing valve and the above-mentioned translating reversing valve.

[0026] The four valve ports of the four-way reversing valve are connected with the inlet of the outdoor heat exchanger, the exhaust port of the compressor, the outlet of the throttling valve and the inlet of the second indoor heat exchanger respectively; and the gas outlet of the gas-liquid separator is connected with the suction port of the compressor.

[0027] The reversing valve is provided with eight interfaces, the fifth interface E is located on one side of the first cavity and communicated with the second cavity through a first connecting pipe, the fourth interface D, the third interface C, the second interface B, the first interface A, the eighth interface H, the seventh interface G and the sixth interface F are sequentially arranged on the other side of the first cavity, and the seventh interface G is communicated with the third cavity through a second connecting pipe.

[0028] The first interface A is connected with the outlet of the ejector, the second interface B is connected with the inlet of the gas-liquid separator, the third interface C is connected with the outlet of the first indoor heat exchanger, the fourth interface D is connected with the first inlet of the ejector, the fifth interface E is connected with the outlet of the outdoor heat exchanger, the sixth interface F is connected with the second inlet of the ejector, the seventh interface G is connected with the outlet of the second indoor heat exchanger, and the eighth interface H is connected with the inlet of the first indoor heat exchanger.

[0029] According to the fifth aspect of the present application, an air-conditioning heat pump system is provided, comprising an ejector, a first indoor heat exchanger, a second indoor heat exchanger, a fan, a gas-liquid separator, an outdoor heat exchanger, a compressor, a throttling valve, a four-way reversing valve and the rotary reversing valve of any one of the above.

[0030] The four valve ports of the four-way reversing valve are connected with the inlet of the outdoor heat exchanger, the exhaust port of the compressor, the outlet of the throttling valve and the inlet of the second indoor heat exchanger respectively; and the gas outlet of the gas-liquid separator is connected with the suction port of the compressor.

[0031] The valve body peripheral wall of the reversing valve is arranged with eight interfaces, which are sequentially interface A, interface B, interface C, interface D, interface E, interface F, interface G and interface H.

[0032] The first interface A is connected with the outlet of the ejector, the second interface B is connected with the inlet of the gas-liquid separator, the third interface C is connected with the outlet of the first indoor heat exchanger, the fourth interface D is connected with the first inlet of the ejector, the fifth interface E is connected with the outlet of the outdoor heat exchanger, the sixth interface F is connected with the second inlet of the ejector, the seventh interface G is connected with the outlet of the second indoor heat exchanger, and the eighth interface H is connected with the inlet of the first indoor heat exchanger.

[0033] Overall, compared with the prior art, the above technical solutions conceived by the present application mainly have the following technical advantages:

[0034] 1. The reversing valve provided by the present application uses pressure difference as driving force to cause axial displacement or rotational movement of the blocking element of the channel adjusting assembly, realizes automatic switching of the multi-way valve working mode, and switches the working mode of the system by switching the fluid flow direction. Without additional electrical energy or mechanical work input, the automatic reversing function can be realized.

[0035] 2. The reversing valve provided by the present application uses the movable piston component to separate the valve body into several cavities, sets several interfaces connectable with the outside in the cavities, covers the interfaces with the slider component, uses the pressure difference in the cavity to push the slider component to move to adjust the position of the covered interfaces, and changes the flow path without changing the external interface connection. This adjustment mode is simple in structure, does not require additional mechanical work input, can realize self-adaptive flow path direction regulation and control by using the fluid pressure of the external system, meets different working condition requirements, helps to improve the overall performance and efficiency of the heat pump air conditioning system, and has wide application prospect.

[0036] 3. The above-mentioned translational reversing valve has eight interfaces and can control the flow direction switching of multiple flow paths at the same time, meeting the demand of synchronous reversing of multiple branch fluid. In various working modes, the valve can stably operate without increasing additional valves or complex pipeline design, reducing the cost and space occupation of the system.

[0037] 4. The rotational reversing valve of the present application sets the valve body as spherical, sets several interfaces on the spherical peripheral wall, sets a valve core inside, separates the interfaces, adjusts the rotation of the valve core through the rotatable valve rod, and changes the flow path. The rotational driving mode of the valve rod can be electric driving or pressure difference driving, the adjustment mode is flexible, and when the rotational driving mode is pressure difference driving, additional mechanical work input is not required, self-adaptive flow path direction regulation and control can be realized by using the fluid pressure of the external system, different working condition requirements can be met, and the application scenarios are wide.

[0038] 5. The present application converts the driving of the valve rod into pressure difference driving by using the flow path pressure difference, separates the shell into three cavities by using the push disc, makes the left and right cavities communicate with the same interface of the spherical valve body to make the pressures of the left and right cavities the same, makes the middle cavity communicate with another interface of the spherical valve body, forms a pressure difference with the left and right cavities, makes the push discs of the left and right cavities slide towards or away from each other, drives the valve rod to rotate clockwise or counterclockwise through gear meshing, and realizes the driving. This setting mode ingeniously converts the pressure difference into mechanical energy, does not require additional electrical energy or mechanical work input, realizes the automatic reversing function, significantly reduces the complexity and cost of the component structure, and provides an efficient and reliable solution for the heat pump air conditioning field.

[0039] 6、The eight-way reversing valve structure is compact, and has universality, can adapt to complex system design, meets the switching demand of working mode. With the unique eight-interface design and reversing function, the eight-way reversing valve breaks through the limitation of traditional reversing valve, and provides a flexible and reliable solution for the heat pump air conditioning system, and has important innovation and practicality. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structure schematic view of a translational eight-way reversing valve provided by an embodiment of the present application.

[0041] Figure 2 is a structure schematic view of a rotational eight-way reversing valve (pressure difference control) provided by an embodiment of the present application.

[0042] Figure 3 is Figure 2 is a structure schematic view of the engagement of the straight rack and the gear in the actuator in

[0043] Figure 4 is a structure schematic view of a rotational eight-way reversing valve (electric control) provided by an embodiment of the present application.

[0044] Figure 5 is a main valve sectional view of the rotational eight-way reversing valve provided by an embodiment of the present application.

[0045] Figure 6 is a structure schematic view of the spool of the rotational eight-way reversing valve provided by an embodiment of the present application (including flat-port arc-shaped grooves and spherical grooves).

[0046] Figure 7 is a structure schematic view of a carbon dioxide air conditioning heat pump system in a refrigeration mode integrated with an eight-way valve.

[0047] Figure 8 is a structure schematic view of a carbon dioxide air conditioning heat pump system in a heating mode integrated with an eight-way valve.

[0048] In all the drawings, the same reference signs are used to represent the same elements or structures, wherein:

[0049] 1-valve body, 2-valve seat, 3-sliding block component, 4-piston component, 5-connector, 5a-first through hole, 5b-second through hole, 6-end cover, 7-first connecting pipe, 8-second connecting pipe;

[0050] 9-cylinder cavity middle cavity, 10-valve rod, 11-push disc, 12-straight rack, 13-outer shell, 13a-outer shell interface one, 13b-outer shell interface two, 13c-outer shell interface three, 13d-outer shell interface four, 14-cylinder cavity two-side cavity, 15-third connecting pipe, 16-fourth connecting pipe, 17-valve body, 18-gear, 19-spool;

[0051] 20 - translation eight-way valve, 21 - compressor, 22 - gas-liquid separator, 23 - throttle valve, 24 - four-way reversing valve, 25 - outdoor heat exchanger, 26 - ejector, 27 - first indoor heat exchanger, 28 - second indoor heat exchanger, 29 - fan. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions, and advantages of the present application clearer, the following further describes the present application with reference to the embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application and not to limit the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0053] Embodiments based on the concept of the present application can be applied with various modifications and can have various modes, and therefore a specific embodiment is shown in the accompanying drawings and is described in detail in the specification or application. However, this does not limit the embodiments of the concept of the present application to the specific disclosed modes, but should be understood to include all modifications, equivalents, and alternatives contained in the idea and technical scope of the present application.

[0054] Translation

[0055] Although the first and / or second terms can be used to describe various constituent elements, the constituent elements are not limited to the terms. The terms are used only to distinguish one constituent element from another, for example, the first constituent element can be named as the second constituent element, and similarly, the second constituent element can be named as the first constituent element without departing from the protection scope of the concept of the present application.

[0056] In the present application, terms indicating directions, such as "up", "down", "left", "right", etc., are used to describe various example structural parts and elements of the present application, but these terms are used herein only for the purpose of convenience of explanation and are determined based on the example orientation shown in the accompanying drawings. Since the embodiments disclosed in the present application can be arranged in different directions, these terms indicating directions are only for illustration and should not be considered as limiting.

[0057] Referring to Figure 1 The present application provides a translation reversing valve, comprising: a pressure driving assembly and a channel adjusting assembly;

[0058] The channel adjusting assembly comprises a plurality of fluid channels, each fluid channel comprising at least one fluid medium inlet and one fluid medium outlet; each fluid channel is separated by a blocking element;

[0059] The pressure driving assembly comprises at least two cavities and a moving element for blocking the two cavities, and the two cavities are respectively provided with interfaces as pressure driving channels for generating pressure difference to drive the moving element to move, and the moving element is used to drive the blocking element to move to change the path of the fluid channel.

[0060] The pressure driving assembly comprises a valve body 1, end covers 6 arranged at both ends of the valve body 1, a connecting piece 5 and a piston part 4 arranged in the valve body 1, the fluid channel and the blocking element of the channel adjusting assembly are arranged in the cavities, the blocking element is a slider part 3, the piston part 4 and the slider part 3 are fixedly connected with the connecting piece 5, the piston part 4 divides the valve body 1 into several cavities, each cavity is provided with a preset number of interfaces, two interfaces are used as interfaces of pressure driving channels and are respectively communicated with the interiors of different cavities, and the slider part 3 is used to cover at least two interfaces in the cavity where the slider part 3 is located.

[0061] When the two interfaces of the pressure driving channels generate pressure difference, the piston part 4 moves in the valve body 1 and drives the slider part 3 to move through the connecting piece 5 to change the position of the covered interfaces.

[0062] In some specific embodiments, the piston part 4 is two, the two piston parts 4 are respectively fixed to two ends of the connecting piece 5 and cooperated with the valve body 1 to form a first cavity, and the two piston parts 4 respectively form second and third cavities with the two end covers 6.

[0063] The first cavity is provided with several interfaces, one interface is communicated with the second cavity through a first connecting pipe 7, another interface is communicated with the third cavity through a second connecting pipe 8, and the interface is covered by the slider part 3, the slider part 3 is fixed on the connecting piece 5 and is used to move under the driving of the piston part 4 to cover different interfaces in the first cavity.

[0064] In particular, the first cavity is provided with eight interfaces, and the slider part 3 is three, the second and third cavities drive the piston part 4 to move under the action of pressure difference to change the position of the interfaces covered by the slider part 3, form different working states, and in any working state, only one interface is not covered by the slider part 3 among the two interfaces communicated with the second and third cavities, and the three slider parts 3 are respectively used to cover two adjacent interfaces to form a two-by-two communication structure.

[0065] One of the two interfaces communicating with the second and third cavities is arranged on one side of the first cavity, and the other seven interfaces are arranged on the other side; the connecting piece 5 is a connecting plate provided with a through hole, which is connected with the inner wall of the valve body 1 to separate the first cavity from the second and third cavities; the interface not covered by the slider member 3 among the two interfaces communicating with the second and third cavities communicates with the interface not covered on the other side through the through hole.

[0066] A limiting element is arranged in the second and third cavities, or the cross-sectional diameter of the outer end of the end cover 6 is arranged to be smaller than the diameter of the piston member 4, so as to limit the two piston members 4;

[0067] The interface and the slider member 3 are provided with a valve seat 2 for improving the sealing between the slider member 3 and the valve body 1.

[0068] Specifically, the two piston members 4 divide the inner part of the valve body 1 into a left cavity, a middle cavity and a right cavity, eight interfaces are arranged in the middle cavity, the fifth interface E is independently arranged on one side of the cavity and communicates with the left cavity through the first connecting pipe 7, the fourth interface D, the third interface C, the second interface B, the first interface A, the eighth interface H, the seventh interface G and the sixth interface F are sequentially arranged on the other side of the middle cavity; the seventh interface G communicates with the right cavity.

[0069] In the working mode 1, the piston member 4 moves to the rightmost side, the fifth interface E communicates with the fourth interface D, under the coverage of the three slider members 3, the third interface C communicates with the second interface B, the first interface A communicates with the eighth interface H, and the seventh interface G communicates with the sixth interface F.

[0070] In the working mode 2, the piston member 4 moves to the leftmost side, the fifth interface E communicates with the sixth interface F; the fourth interface D communicates with the third interface C, the second interface B communicates with the first interface A, and the eighth interface H communicates with the seventh interface G.

[0071] In order to ensure that the slider can cover two adjacent interfaces in the two working modes, when the piston moves to one side, the distance between the piston at the other end and the limiting member or the inner side end of the end cover should be greater than the width of each interface, less than the sum of the width of each interface and the distance between two adjacent interfaces, and less than the distance from the fourth interface D or the sixth interface F to the limiting member or the inner side end of the end cover on the side, and preferably equal to the sum of the width of each interface and the distance between two adjacent interfaces, so that the interface is always in the middle cavity when the piston moves left or right.

[0072] Please refer to Figures 2-6The present invention also provides a rotary directional valve, comprising: a main valve, an actuator, and a valve stem 10; the main valve includes a valve body 17, a plurality of ports arranged around the periphery of the valve body 17, and a valve core 19 disposed within the valve body 17, wherein the valve core 19 cooperates with the ports to connect adjacent ports to form a flow channel; the valve core 19 is fixedly connected to the valve stem 10.

[0073] The actuator is movably connected to the valve stem 10 and is used to drive the valve stem 10 to rotate, thereby driving the valve core 19 to rotate, so as to change the position of the two connected interfaces to meet different working conditions and the adjustment method is flexible.

[0074] Preferably, eight ports are evenly arranged on the peripheral wall of the valve body 17; adjacent ports form a connected flow channel under the separation of the valve core 19. Figure 5 The interface includes interface A, interface B, interface C, interface D, interface E, interface F, interface G, and interface H.

[0075] like Figure 4 The actuator is a motor-driven structure, or as... Figure 2 It is a differential pressure driven structure; when it is a differential pressure driven structure, the actuator and valve stem (10) form a pressure driven assembly, and the main valve forms a channel regulating assembly. The valve stem 10 is driven to rotate by gear meshing. The gear is driven by differential pressure. At this time, two of the eight interfaces on the valve body are used as interfaces for pressure driven channels, which are respectively connected to the high pressure and low pressure media of external equipment.

[0076] Specifically, such as Figure 2 The differential pressure drive structure includes: a housing 13 and two push plates 11 disposed within the housing 13. The push plates 11 are in contact with the inner wall of the housing 13 and can slide relative to the housing 13. The two push plates 11 divide the interior of the housing 13 into three cavities: left, middle, and right. The two push plates 11 face towards the middle cavity (e.g.,...). Figure 2 A spur rack 12 is connected to one side of the cylinder cavity 9). A gear 18 that meshes with the spur rack 12 is provided on the valve stem 10. The valve stem 10 passes through one side of the side wall of the housing 13, and the gear 18 meshes with the spur rack 12. Specifically, as... Figure 3 The tooth grooves of the two spur racks 12 are opposite each other and parallel to the valve stem 10. Gears are fitted around the circumference of the valve stem 10 and mesh with the tooth grooves on the spur racks 12. The pressure in the left and right chambers is kept consistent, forming a pressure difference with the middle chamber. When the pressure in the left and right chambers is greater than the pressure in the middle chamber, the two push plates 11 move towards each other, causing the valve stem 10 to rotate counterclockwise. When the pressure is less than the pressure in the middle chamber, the two push plates 11 slide in opposite directions, causing the valve stem 10 to rotate clockwise, thereby causing the valve core 19 to rotate to adjust the position of the communication interface.

[0077] In particular, one interface is arranged in each of the left and right cavities, such as shell interface one 13a and shell interface four 13d in Figure 2 , and the two interfaces are communicated with each other through a third connecting pipe 15 and communicated with one interface on the valve body 17; the interface (such as shell interface two 13b and shell interface three 13c in Figure 2 ) in the middle cavity is communicated through a fourth connecting pipe 16, and the fourth connecting pipe 16 is also communicated with another interface on the valve body 17.

[0078] The valve stem 10 and the valve body 17 and the valve stem 10 and the actuator shell are both provided with sealing members.

[0079] Preferably, the valve body 17 is a hollow ball valve body, the eight interfaces are arranged on a circumferential wall with the center of the circle coinciding with the center of the ball, the valve core 19 is a spherical structure connected with the inner wall of the hollow ball valve body, and four grooves are arranged on the circumferential wall of the center, and the length of each groove in the circumferential direction meets the requirement of covering only two adjacent interfaces, that is, the length of the groove needs to be equal to or greater than the width of the two interfaces plus the distance between the two interfaces, and less than 2 times the width of the two interfaces plus the distance between the two interfaces. The outer wall of the valve core 19 between the two grooves is connected with the inner wall of the valve body 17 to form isolation and sealing, so as to separate the passages.

[0080] Please refer to Figure 7 and 8 , the application also provides an air conditioner heat pump system, comprising: an ejector 26, a first indoor heat exchanger 27, a second indoor heat exchanger 28, a fan 29, a gas-liquid separator 22, an outdoor heat exchanger 25, a compressor 21, a throttling valve 23, a four-way reversing valve 24 and the translational reversing valve;

[0081] The four valve ports of the four-way reversing valve 24 are respectively connected with the inlet of the outdoor heat exchanger 25, the exhaust port of the compressor 21, the outlet of the throttling valve 23 and the inlet of the second indoor heat exchanger 28; the gas outlet of the gas-liquid separator 22 is connected with the suction port of the compressor 21;

[0082] The translational reversing valve is provided with eight interfaces, the fifth interface E is communicated with the second cavity, the fourth interface D, the third interface C, the second interface B, the first interface A, the eighth interface H, the seventh interface G and the sixth interface F are sequentially arranged on one side of the first cavity; the seventh interface G is communicated with the third cavity.

[0083] The first interface A is connected with the outlet of the ejector 26; the second interface B is connected with the inlet of the gas-liquid separator 22; the third interface C is connected with the outlet of the first indoor heat exchanger 27; the fourth interface D is connected with the first inlet of the ejector 26; the fifth interface E is connected with the outlet of the outdoor heat exchanger 25; the sixth interface F is connected with the second inlet of the ejector 26; the seventh interface G is connected with the outlet of the second indoor heat exchanger 28; and the eighth interface H is connected with the inlet of the first indoor heat exchanger 27.

[0084] The air-conditioning heat pump system comprises an ejector 26, a first indoor heat exchanger 27, a second indoor heat exchanger 28, a fan 29, a gas-liquid separator 22, an outdoor heat exchanger 25, a compressor 21, a throttling valve 23, a four-way reversing valve 24 and the rotary reversing valve.

[0085] The four valve ports of the four-way reversing valve 24 are respectively connected with the inlet of the outdoor heat exchanger 25, the exhaust port of the compressor 21, the outlet of the throttling valve 23 and the inlet of the second indoor heat exchanger 28; and the gas outlet of the gas-liquid separator 22 is connected with the suction port of the compressor 21.

[0086] The valve body 17 of the rotary reversing valve is arranged with eight interfaces in sequence, which are the interface A, the interface B, the interface C, the interface D, the interface E, the interface F, the interface G and the interface H.

[0087] The first interface A is connected with the outlet of the ejector 26; the second interface B is connected with the inlet of the gas-liquid separator 22; the third interface C is connected with the outlet of the first indoor heat exchanger 27; the fourth interface D is connected with the first inlet of the ejector 26; the fifth interface E is connected with the outlet of the outdoor heat exchanger 25; the sixth interface F is connected with the second inlet of the ejector 26; the seventh interface G is connected with the outlet of the second indoor heat exchanger 28; and the eighth interface H is connected with the inlet of the first indoor heat exchanger 27.

[0088] The application will be further described below in combination with specific embodiments.

[0089] As shown in Figure 1 The slider component 3, the piston component 4 and the connecting component 5 are connected together to form a movable valve core, which moves axially in the main valve to switch the fluid flow direction. The two piston components 4 divide the main valve into left, middle and right cavities. The first connecting pipe 7 is connected at one end with the fifth interface E and at the other end with the left cavity of the main valve; and the second connecting pipe 8 is connected at one end with the seventh interface G and at the other end with the right cavity of the main valve.

[0090] The eight interfaces are connected with pipes in external systems. When the fluid pressure entering the fifth interface E is high pressure and the fluid pressure entering the seventh interface G is low pressure, the left chamber pressure in the main valve is higher than the right chamber pressure, the valve core is driven by the fluid pressure difference to translate to the right, moves to the first working position, and the eight-way reversing valve is in working mode 1. In working mode 1, the fifth interface E is communicated with the fourth interface D, the fluid flowing into the fifth interface E flows to the fourth interface D through the first through hole 5a on the connecting piece 5, in addition, the second interface B is communicated with the third interface C, the first interface A is communicated with the eighth interface H, and the sixth interface F is communicated with the seventh interface G.

[0091] When the fluid pressure entering the fifth interface E is low pressure and the fluid pressure entering the seventh interface G is high pressure, the right chamber pressure in the main valve is higher than the left chamber pressure, the valve core is driven by the fluid pressure difference to translate to the left, moves to the second working position, and the eight-way reversing valve is in working mode 2. In working mode 2, the fifth interface E is communicated with the sixth interface F, the fluid flowing into the fifth interface E flows to the sixth interface F through the second through hole 5b on the connecting piece 5, in addition, the first interface A is communicated with the second interface B, the third interface C is communicated with the fourth interface D, and the seventh interface G is communicated with the eighth interface H.

[0092] Referring to Figure 2 The application provides a rotary eight-way reversing valve (pressure difference control), which comprises a main valve, an actuator and a valve rod 10. The main valve comprises a valve body 17, a valve seat, a valve core 19 connected with the valve rod 10, eight pipe interfaces evenly arranged around the central axis and welded on the valve body, which are sequentially the first interface A to the eighth interface H; four flow channels are formed in the valve core 19; the actuator comprises a shell 13, four shell interfaces are arranged on the shell 13, and symmetrically distributed push discs 11 are slidably connected in the shell 13; the left and right push discs 11 are fixedly connected with straight racks 12, the straight racks 12 are engaged with a gear 18, the gear 18 is connected with the valve rod 10, and sealing elements are arranged between the valve rod 10 and the valve body 17 and between the valve rod 10 and the shell 13 of the actuator, so as to prevent fluid leakage.

[0093] The symmetrically distributed push discs 11 divide the cylinder chamber into left, middle and right chambers. One end of the third connecting pipe 15 is connected with the fifth interface E, and the other end is branched into parallel connecting pipes, which are connected with the shell interface one 13a and the shell interface four 13d (the left chamber and the right chamber of the cylinder chamber) of the shell 13 respectively; one end of the fourth connecting pipe 16 is connected with the seventh interface G, and the other end is branched into parallel connecting pipes, which are connected with the shell interface two 13b and the shell interface three 13c (the middle chamber of the cylinder chamber) of the shell 13 respectively. By utilizing the fluid pressure difference between the left and right chambers and the middle chamber of the cylinder, the push disc 11 and the straight rack 12 connected with the push disc 11 are translated. Figure 3When the two push discs 11 are close to each other, the push disc 11 drives the straight rack 12 to move, through the meshing of the straight rack 12 and the gear 18, the gear 18 rotates counterclockwise, and the valve rod 10 rotates counterclockwise; when the two push discs 11 are away from each other, the push disc 11 drives the straight rack 12 to move, through the meshing of the straight rack 12 and the gear 18, the gear 18 rotates clockwise, and the valve rod 10 rotates clockwise.

[0094] The eight interfaces of the eight-way directional control valve are connected with pipelines in the system, when the fluid pressure entering the fifth interface E is high pressure and the fluid pressure entering the seventh interface G is low pressure, the pressures of the left cavity and the right cavity in the cylinder cavity are higher than the pressure of the middle cavity, at this time, the left and right symmetrically distributed push discs 11 are close to each other under the driving of the fluid pressure difference, drive the straight rack 12 to move, the straight rack 12 drives the gear 18 to rotate counterclockwise, the gear 18 drives the valve rod 10 to rotate counterclockwise, the valve core 19 connected with the valve rod 10 rotates to the first working position, the eight-way directional control valve is in working mode 1, as shown in Figure 5 , in working mode 1, the first interface A is communicated with the eighth interface H, the second interface B is communicated with the third interface C, the fourth interface D is communicated with the fifth interface E, and the sixth interface F is communicated with the seventh interface G.

[0095] When the fluid pressure entering the fifth interface E is low pressure and the fluid pressure entering the seventh interface G is high pressure, the pressures of the left cavity and the right cavity in the cylinder cavity are lower than the pressure of the middle cavity, at this time, the left and right symmetrically distributed push discs 11 are away from each other under the driving of the fluid pressure difference, drive the straight rack 12 to move, the straight rack 12 drives the gear 18 to rotate clockwise, the gear 18 drives the valve rod 10 to rotate clockwise, the valve core 19 connected with the valve rod 10 rotates 45° clockwise from the first working position to the second working position, at this time, the eight-way directional control valve is in working mode 2, as shown in Figure 5 , in working mode 2, the first interface A is communicated with the second interface B, the third interface C is communicated with the fourth interface D, the fifth interface E is communicated with the sixth interface F, and the seventh interface G is communicated with the eighth interface H.

[0096] Referring to Figure 4 , the application also provides a rotary eight-way directional control valve (electric control), which comprises a main valve and an actuator. Figure 2 The structure of the main valve is the same as that of the rotary eight-way directional control valve (pressure difference control) shown in the figure, and the actuator adopts a motor drive. The eight interfaces of the eight-way directional control valve are connected with pipelines in the system, when the fluid pressure entering the fifth interface E is high pressure and the fluid pressure entering the seventh interface G is low pressure, the motor drives the valve rod 10 to rotate counterclockwise, the valve rod 10 drives the valve core 19 connected with it to rotate to the first working position, at this time, the eight-way directional control valve is in working mode 1, as shown in Figure 5As shown, in the working mode 1, the first interface A is communicated with the eighth interface H, the second interface B is communicated with the third interface C, the fourth interface D is communicated with the fifth interface E, and the sixth interface F is communicated with the seventh interface G. When the fluid pressure entering the fifth interface E is low pressure and the fluid pressure entering the seventh interface G is high pressure, the motor drives the valve rod 10 to rotate clockwise, and the valve rod 10 drives the valve core 19 connected therewith to rotate clockwise by 45° from the first working position to the second working position, at this time, the eight-way reversing valve is in the working mode 2, as shown in the figure. Figure 5 As shown, in the working mode 2, the first interface A is communicated with the second interface B, the third interface C is communicated with the fourth interface D, the fifth interface E is communicated with the sixth interface F, and the seventh interface G is communicated with the eighth interface H.

[0097] Referring to Figure 6 The valve core of the eight-way reversing valve provided by the application can be provided with a flat-mouth arc-shaped or spherical flow channel or groove surface.

[0098] Referring to Figure 7 The eight-way reversing valve provided by the application is applied to a carbon dioxide air-conditioning heat pump system. The carbon dioxide air-conditioning heat pump system integrated with the eight-way valve comprises a translation eight-way reversing valve 20, an ejector 26, a first indoor heat exchanger 27, a second indoor heat exchanger 28, a fan 29, a gas-liquid separator 22, an outdoor heat exchanger 25, a compressor 21, a throttling valve 23 and a four-way reversing valve 24. The four valve ports of the four-way reversing valve 24 are respectively connected to the inlet of the outdoor heat exchanger 25, the exhaust port of the compressor 21, the outlet of the throttling valve 23 and the inlet of the second indoor heat exchanger 28.

[0099] The gas outlet of the gas-liquid separator 22 is connected to the suction port of the compressor 21; the eight-way valve has eight interfaces A-H; the first interface A is connected to the outlet of the ejector 26; the second interface B is connected to the inlet of the gas-liquid separator 22; the third interface C is connected to the outlet of the first indoor heat exchanger 27; the fourth interface D is connected to the first inlet of the ejector 26; the fifth interface E is connected to the outlet of the outdoor heat exchanger 25; the sixth interface F is connected to the second inlet of the ejector 26; the seventh interface G is connected to the outlet of the second indoor heat exchanger 28; and the eighth interface H is connected to the inlet of the first indoor heat exchanger 27.

[0100] In the cooling mode, the four-way reversing valve 24 connects the outlet of the compressor 21 to the inlet of the outdoor heat exchanger 25, and connects the outlet of the throttling valve 23 to the inlet of the second indoor heat exchanger 28; at this time, the high-pressure fluid discharged by the compressor 21 enters the fifth interface E of the translating eight-way valve 20 through the outdoor heat exchanger 25, and the low-pressure fluid at the outlet of the second indoor heat exchanger 28 enters the seventh interface G of the translating eight-way valve 20, the pressure in the left cavity of the translating eight-way valve 20 is greater than that in the right cavity, and the movable valve core translates to the right, moving to the first working position, and the translating eight-way valve 20 is in working mode 1, as shown in Figure 1 at this time, the first interface A and the eighth interface H of the translating eight-way valve 20 are in communication, the second interface B and the third interface C are in communication, the fourth interface D and the fifth interface E are in communication, and the sixth interface F and the seventh interface G are in communication; the compressor 21 compresses the refrigerant to high temperature and high pressure, and then enters the outdoor heat exchanger 25 through the four-way reversing valve 24; the refrigerant is cooled in the outdoor heat exchanger 25, and then flows from the fifth interface E to the fourth interface D of the translating eight-way valve 20, and then enters the first inlet of the ejector 26; the high-pressure refrigerant enters the ejector 26 as a power fluid, and then sprays in the ejector 26, forming a first pressure and a second pressure at the outlet and the second inlet of the ejector 26 respectively, wherein the first pressure is higher than the second pressure, and both the first pressure and the second pressure are lower than the high-pressure gas pressure at the inlet of the ejector 26; the refrigerant vapor at the outlet of the second indoor heat exchanger 28, which has the second pressure, flows from the seventh interface G to the sixth interface F of the translating eight-way valve 20, and then enters the second inlet of the ejector 26 to mix with the power fluid refrigerant; the mixed refrigerant is lifted to the first pressure, and then flows out of the outlet of the ejector 26; the refrigerant at the outlet of the ejector 26, which has the first pressure, flows from the first interface A to the eighth interface H of the translating eight-way valve 20, and then enters the first indoor heat exchanger 27 to evaporate and absorb heat for cooling; the refrigerant from the outlet of the first indoor heat exchanger 27 flows from the third interface C to the second interface B of the translating eight-way valve 20, and then enters the gas-liquid separator 22; in the gas-liquid separator 22, the refrigerant liquid that fails to completely evaporate in the first indoor heat exchanger 27 is separated into gas and liquid, and then flows out of the liquid outlet of the gas-liquid separator 22; after being throttled and reduced in pressure and temperature by the throttling valve 23, the refrigerant enters the second indoor heat exchanger 28 through the four-way reversing valve 24, evaporates and absorbs heat, and then is sucked into the second inlet of the ejector 26 through the translating eight-way valve 20; the refrigerant vapor from the gas outlet of the gas-liquid separator 22 directly enters the suction port of the compressor, completing the refrigeration cycle.

[0101] Referring to Figure 8In heating mode, the four-way reversing valve 24 connects the exhaust port of the compressor 21 to the inlet of the second indoor heat exchanger 28, and connects the outlet of the throttle valve 23 to the inlet of the outdoor heat exchanger 25. At this time, the high-pressure fluid discharged from the compressor 21 enters the seventh port G of the sliding eight-way valve 20 through the second indoor heat exchanger 28, while the low-pressure fluid from the outlet of the outdoor heat exchanger 25 enters the fifth port E of the sliding eight-way valve 20. The pressure in the right chamber of the sliding eight-way valve 20 is greater than the pressure in the left chamber, causing the movable valve core to slide to the left, moving to the second working position. The sliding eight-way valve 20 is in working mode 2. Figure 1 As shown, at this time, the first port A of the sliding eight-way valve 20 is connected to the second port B, the third port C is connected to the fourth port D, the fifth port E is connected to the sixth port F, and the seventh port G is connected to the eighth port H. After the compressor 21 compresses the refrigerant to a high temperature and high pressure, it enters the second indoor heat exchanger 28 through the four-way reversing valve 24 to release heat. After the fluid flows out of the second indoor heat exchanger 28, it flows through the seventh port G of the sliding eight-way valve 20 to the eighth port H, and then enters the first indoor heat exchanger 27 for further heat release. The fluid flowing out of the first indoor heat exchanger 27 flows through the third port C of the sliding eight-way valve 20 to the fourth port D, and then flows into the first inlet of the ejector 26. The high-pressure refrigerant, as the driving fluid, enters the ejector 26 from the first inlet and is injected. A first pressure and a second pressure are formed at the outlet and the second inlet of the ejector 26, respectively. The first pressure is higher than the second pressure, and both the first pressure and the second pressure are lower than the high-pressure gas at the inlet of the ejector 26. The refrigerant at the outlet of the outdoor heat exchanger 25, with a pressure of the second pressure, flows from the fifth port E of the sliding eight-way valve 20 to the sixth port F. It then enters the ejector 26 through the second inlet and mixes with the kinetic fluid refrigerant. The pressure of the mixed refrigerant is increased to the first pressure, and it flows out from the outlet of the ejector 26. At the outlet of the ejector 26, the refrigerant at the first pressure flows from the first port A of the sliding eight-way valve 20 to the second port B, and then... The refrigerant liquid enters the gas-liquid separator 22. After gas-liquid separation, the refrigerant liquid flows out from the liquid outlet of the gas-liquid separator 22. After being throttled, depressurized, and cooled by the throttling valve 23, it enters the four-way reversing valve 24 and then enters the outdoor heat exchanger 25. The low-temperature, low-pressure refrigerant absorbs heat and evaporates in the outdoor heat exchanger 25. After being drawn in by the second inlet of the ejector 26 through the sliding eight-way valve 20, the refrigerant vapor coming out from the gas outlet of the gas-liquid separator 22 directly enters the suction port of the compressor, completing the heating cycle.

[0102] The eight-way reversing valve of the application can control the flow direction switching of multiple flow paths at the same time, meeting the demand of synchronous reversing of multiple branch fluid. When differential pressure control is adopted, the reversing valve uses the pressure difference of the internal fluid of the system as the driving force, without additional electrical energy or mechanical work input, realizing the automatic reversing function, significantly reducing the complexity and cost of the component structure, and providing an efficient and reliable solution for the field of heat pump air conditioning.

[0103] Those skilled in the art will easily understand that the above description is only the preferred embodiment of the application, and is not used to limit the application, and any modifications, equivalent replacements and improvements made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A reversing valve, characterized in that, The application relates to a pressure-driven component and a channel adjusting component. The channel adjusting component comprises several fluid channels, each of which comprises at least one fluid medium inlet and one fluid medium outlet; each fluid channel is separated by a blocking element; The pressure-driven component comprises at least two cavities and a moving element for blocking the two cavities, the two cavities are respectively provided with interfaces as pressure-driven channels, the pressure difference between the two interfaces drives the moving element to move, and the moving element drives the blocking element to move so as to change the path of the fluid channels. The pressure-driven component comprises a valve body (1), end covers (6) arranged at two ends of the valve body (1), a connecting piece (5) and a piston part (4) arranged in the valve body (1); the piston part (4) divides the valve body (1) into several cavities, the fluid channels and the blocking element of the channel adjusting component are arranged in the cavities, the blocking element is a sliding block part (3); the piston part (4) and the sliding block part (3) are fixedly connected with the connecting piece (5); the sliding block part (3) is used for covering at least two interfaces in the cavity where the sliding block part (3) is arranged; 2. The reversing valve of claim 1, wherein When the pressure difference between the two interfaces of the pressure-driven channels is generated, the piston part (4) moves in the valve body (1) and drives the sliding block part (3) to move through the connecting piece (5), so as to change the position of the interfaces covered by the sliding block part (3). The piston part (4) has two; the two piston parts (4) are respectively fixed at two ends of the connecting piece (5) and cooperated with the valve body (1) to form a first cavity; the two piston parts (4) form a second cavity and a third cavity between the two piston parts (4) and the two end covers (6) respectively; 3. The reversing valve of claim 2, wherein The first cavity is provided with several interfaces, one of the interfaces is communicated with the second cavity through a first connecting pipe (7); the other interface is communicated with the third cavity through a second connecting pipe (8), and the interface is covered by the sliding block part (3); the sliding block part (3) is fixed on the connecting piece (5) and used for moving under the driving of the piston part (4) to cover different interfaces in the first cavity. The first cavity is provided with eight interfaces, the sliding block part (3) has three; the second cavity and the third cavity drive the piston part (4) to move under the action of the pressure difference, so as to change the position of the interfaces covered by the sliding block part (3) and form different working states, and in any working state, only one of the two interfaces communicated with the second cavity and the third cavity is not covered by the sliding block part (3); the three sliding block parts (3) are respectively used for covering two adjacent interfaces to form a two-by-two communication structure.

4. The reversing valve of claim 3, wherein One of the two interfaces communicated with the second cavity and the third cavity is arranged on one side of the first cavity, and the other seven interfaces are arranged on the other side of the first cavity; the connecting piece (5) is a connecting plate provided with a through hole, the connecting plate is connected with the inner wall of the valve body (1) to separate the first cavity from the second cavity and the third cavity; the interface, which is not covered by the sliding block part (3) and is communicated with the second cavity and the third cavity, is communicated with the other interface not covered on the other side through the through hole.

5. The reversing valve of claim 3, wherein ​ And / or, a limiting element is arranged in the second and third cavities or the cross-sectional diameter of the outer end of the end cover (6) is arranged to be smaller than the diameter of the piston component (4) to form a limiting effect on the two piston components (4); And / or, a valve seat (2) is arranged between the interface and the slider component (3) to improve the sealing between the slider component (3) and the valve body (1).

6. The diverter valve of claim 1, wherein, The pressure driving assembly comprises an actuator and a valve stem (10); the channel adjusting assembly comprises a main valve; The main valve comprises a valve body (17), a plurality of interfaces arranged around the peripheral wall of the valve body (17), and a valve core (19) arranged in the valve body (17), the valve core (19) cooperates with the interfaces to make two adjacent interfaces communicate to form a flow channel; the valve core (19) is fixedly connected with the valve stem (10); The actuator is movably connected with the valve stem (10) to drive the valve stem (10) to rotate, and then drive the valve core (19) to rotate to change the position of the two communicating interfaces.

7. The reversing valve of claim 6, wherein The actuator is a differential pressure driving structure; the differential pressure driving structure comprises an outer shell (13) and two push discs (11) arranged in the outer shell (13), the push disc (11) is in contact with the inner wall of the outer shell (13), and the two push discs (11) divide the inner space of the outer shell (13) into left, middle and right cavities; one side of each of the two push discs (11) is connected with a straight rack (12), the valve stem (10) is provided with a gear (18) matched with the straight rack (12), the valve stem (10) penetrates through one side of the side wall of the outer shell (13), and the gear (18) is engaged with the straight rack (12); One interface is arranged in each of the left and right cavities, and the two interfaces are communicated through a third connecting pipe (15) and communicated with one interface on the valve body (17); an interface is arranged in the middle cavity, and the interface is communicated with another interface on the valve body (17) through a fourth connecting pipe (16); And / or, eight interfaces are uniformly arranged on the peripheral wall of the valve body (17); two adjacent interfaces form a communicated flow channel under the separation of the valve core (19).

8. A reversing valve characterized by The pressure driving assembly comprises an actuator and a valve stem (10); the channel adjusting assembly comprises a main valve; The main valve comprises a valve body (17), a plurality of interfaces arranged around the peripheral wall of the valve body (17), and a valve core (19) arranged in the valve body (17), the valve core (19) cooperates with the interfaces to make two adjacent interfaces communicate to form a flow channel; the valve core (19) is fixedly connected with the valve stem (10); The actuator is movably connected with the valve stem (10) to drive the valve stem (10) to rotate, and then drive the valve core (19) to rotate to change the position of the two communicating interfaces. The actuator is a motor driving structure or a differential pressure driving structure.

9. Application of the reversing valve of any one of claims 1-8 in an air conditioning and heat pump system.

10. An air conditioning and heat pump system characterized by comprising: The pressure driving assembly comprises an actuator and a valve stem (10); the channel adjusting assembly comprises a main valve; The ejector (26), the first indoor heat exchanger (27), the second indoor heat exchanger (28), the fan (29), the gas-liquid separator (22), the outdoor heat exchanger (25), the compressor (21), the throttling valve (23), the four-way reversing valve (24) and the reversing valve of any one of claims 1-8; The four valve ports of the four-way reversing valve (24) are connected with the inlet of the outdoor heat exchanger (25), the exhaust port of the compressor (21), the outlet of the throttling valve (23) and the inlet of the second indoor heat exchanger (28) respectively; the gas outlet of the gas-liquid separator (22) is connected with the suction port of the compressor (21); When the reversing valve is the reversing valve of any one of claims 1-5, the reversing valve is provided with eight interfaces, the fifth interface E is in communication with the second cavity, the fourth interface D, the third interface C, the second interface B, the first interface A, the eighth interface H, the seventh interface G and the sixth interface F are arranged in sequence on one side of the first cavity; the seventh interface G is in communication with the third cavity; The first interface A is connected with the outlet of the ejector (26); the second interface B is connected with the inlet of the gas-liquid separator (22); the third interface C is connected with the outlet of the first indoor heat exchanger (27); the fourth interface D is connected with the first inlet of the ejector (26); the fifth interface E is connected with the outlet of the outdoor heat exchanger (25); the sixth interface F is connected with the second inlet of the ejector (26); the seventh interface G is connected with the outlet of the second indoor heat exchanger (28); and the eighth interface H is connected with the inlet of the first indoor heat exchanger (27). When the reversing valve is the reversing valve of any one of claims 6-8, the valve body (17) of the reversing valve is provided with eight interfaces arranged in sequence, which are interface A, interface B, interface C, interface D, interface E, interface F, interface G and interface H; The first interface A is connected with the outlet of the ejector (26); the second interface B is connected with the inlet of the gas-liquid separator (22); the third interface C is connected with the outlet of the first indoor heat exchanger (27); the fourth interface D is connected with the first inlet of the ejector (26); the fifth interface E is connected with the outlet of the outdoor heat exchanger (25); the sixth interface F is connected with the second inlet of the ejector (26); the seventh interface G is connected with the outlet of the second indoor heat exchanger (28); and the eighth interface H is connected with the inlet of the first indoor heat exchanger (27).

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