Solenoid switching valve and refrigeration system having the same

Abstract

The present invention discloses an electromagnetic switching valve and a refrigeration system having the same, wherein the electromagnetic switching valve comprises a valve body component, the valve body component comprises a main valve cavity, a first cavity, a second cavity, and a third cavity, the second cavity is closer to the main valve cavity than the first cavity, the second cavity is located at one end of the main valve cavity, and the third cavity is located at the other end of the main valve cavity, and further comprises a first pilot valve component and a second pilot valve component, and the valve body component further comprises a slider, and under the control of the first and second pilot valve components, the sliding direction of the slider can be switched so that the slider can be switched between three working positions: in the first working position, the E interface and the S interface are connected through the inner cavity of the slider, and the C interface is not connected with the inner cavity of the slider; in the second working position, the E, S, and C interfaces are all connected with the inner cavity of the slider; in the third working position, the S interface and the C interface are connected through the inner cavity of the slider, and the E interface is not connected with the inner cavity of the slider. Under the condition that the working conditions of the indoor and outdoor heat exchangers remain unchanged, the defrosting operation of the outdoor unit is realized.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to an electromagnetic switching valve and a refrigeration system having the same. Background Art

[0002] In a refrigeration system, a four-way valve is usually used to switch the flow direction of the refrigerant. The four-way valve generally has two working positions. When used in an air-conditioning refrigeration system, when the air conditioner is in a refrigeration cycle, the D pipe of the four-way valve is connected to the C pipe, and the E pipe is connected to the S pipe. At this time, the outdoor heat exchanger contains high-temperature and high-pressure gas, which releases heat to the outdoor environment, and the indoor heat exchanger contains low-temperature and low-pressure gas, which absorbs heat from the indoor environment to achieve indoor cooling; when the air conditioner is in a heating cycle, the D pipe is connected to the E pipe, and the C pipe is connected to the S pipe. The indoor heat exchanger contains high-temperature and high-pressure gas, which releases heat to the indoor environment to achieve indoor heating, and the outdoor heat exchanger contains low-temperature and low-pressure gas to achieve outdoor cooling.

[0003] In actual applications, when the air-conditioning refrigeration system is in a heating cycle for a long time, frost will appear on the outdoor heat exchanger. In order to ensure the normal operation of the air-conditioning system, the outdoor heat exchanger needs to be defrosted.

[0004] At present, the commonly used method is to switch the position of the four-way valve to put the system in a refrigeration cycle state, so that the outdoor heat exchanger passes high-temperature and high-pressure gas to achieve defrosting. After defrosting is completed, the position of the four-way valve is switched to achieve a heating cycle. Summary of the invention

[0005] The present invention provides an electromagnetic switching valve with a new structure, including a valve body component, wherein the valve body component is provided with a main valve cavity, and also provided with a first cavity, a second cavity and a third cavity, each cavity being independently arranged, the second cavity being located at one end of the main valve cavity, the third cavity being located at the other end of the main valve cavity, the second cavity being closer to the main valve cavity than the first cavity, a slider and a valve seat being provided in the main valve cavity, the valve seat being provided with an E interface, an S interface and a C interface, the valve body component is also provided with a D interface, the valve body component also includes a D pipe, an E pipe, an S pipe and a C pipe, the D pipe is fixedly connected to the D interface and communicated with the main valve cavity through the D interface, the E pipe is fixedly connected to the E interface, the S pipe is fixedly connected to the S interface, and the C pipe is fixedly connected to the C interface, the electromagnetic switching valve also includes a first pilot valve component and a second pilot valve component, the first pilot valve component includes a first d1 position capillary, the first d1 position capillary is connected to The D pipe is connected, the first d1 capillary is connected to the main valve cavity through the D pipe, and also includes a first s1 capillary, a first e1 capillary and a first c1 capillary. The first s1 capillary is connected to the S pipe, the first s1 capillary is connected to the slider inner cavity of the slider through the S pipe, the first e1 capillary is connected to the second cavity, the first c1 capillary is connected to the third cavity, the second pilot valve component includes a second d2 capillary, the second d2 capillary is connected to the D pipe, the second d2 capillary is connected to the main valve cavity through the D pipe, and also includes a second s2 capillary and a second e2 capillary, the second s2 capillary is connected to the S pipe, the second s2 capillary is connected to the slider inner cavity through the S pipe, the second e2 capillary is connected to the first cavity, the slider can be switched between three working positions, and is configured as follows:

[0006] Located at the first working position, the first pilot valve component is in a power-off state, the second pilot valve component is in a power-on state, the first cavity and the second cavity form a low-pressure state, the third cavity forms a high-pressure state, the E interface and the S interface are in communication with the slider inner cavity, the C interface is not in communication with the slider inner cavity, the slider inner cavity has a first projection on the plane where the upper surface of the valve seat is located, the first projection covers at least a portion of the E interface, and the first projection covers at least a portion of the S interface;

[0007] Located at the second working position, the first pilot valve component and the second pilot valve component are both in a power-off state, the first cavity forms a high-pressure state, the second cavity forms a low-pressure state, the third cavity forms a high-pressure state, the E interface, the S interface and the C interface are all connected to the inner cavity of the slider, the inner cavity of the slider has a second projection on the plane where the upper surface of the valve seat is located, the second projection completely covers the S interface, the second projection covers at least a portion of the E interface, and the second projection covers at least a portion of the C interface;

[0008] Located in the third working position, the first pilot valve component is in an energized state, the second pilot valve component is in an off-power state, the first cavity and the second cavity form a high-pressure state, the third cavity forms a low-pressure state, the S interface and the C interface are connected to the slider inner cavity, the E interface is not connected to the slider inner cavity, the slider inner cavity has a third projection on the plane where the valve seat upper surface is located, the third projection covers at least part of the S interface, and the third projection covers at least part of the C interface.

[0009] The present invention provides another electromagnetic switching valve with a new structure, including a valve body component, wherein the valve body component is provided with a main valve cavity, and is also provided with a first cavity, a second cavity and a third cavity, each cavity is independently arranged, the second cavity is located at one end of the main valve cavity, the third cavity is located at the other end of the main valve cavity, the second cavity is closer to the main valve cavity than the first cavity, a slider and a valve seat are provided in the main valve cavity, the valve seat is provided with an E interface, an S interface and a C interface, the valve body component also includes a D interface, the valve body component also includes a D pipe, an E pipe, an S pipe and a C pipe, the D pipe is fixedly connected to the D interface and communicated with the main valve cavity through the D interface, the E pipe is fixedly connected to the E interface, the S pipe is fixedly connected to the S interface, and the C pipe is fixedly connected to the C interface, the electromagnetic switching valve also includes a first pilot valve component and a second pilot valve component, the first pilot valve component includes a first d1 position capillary, the first d1 position capillary is connected to the D pipe, and the first d1 position capillary is communicated with the main valve cavity through the D pipe, The invention also includes a first s1 capillary, a first e1 capillary and a first c1 capillary, wherein the first s1 capillary is connected to the S pipe, the first s1 capillary is connected to the inner cavity of the slider of the slider through the S pipe, the first e1 capillary is connected to the third cavity, the first c1 capillary is connected to the second cavity, the second pilot valve component includes a second d2 capillary, the second d2 capillary is connected to the D pipe, the second d2 capillary is connected to the main valve cavity through the D pipe Or the valve body component includes a second valve body, the second pilot valve component has a second pilot valve sleeve, the second pilot valve sleeve is fixedly connected to the second valve body, the second sleeve cavity of the second pilot valve sleeve is connected to the main valve cavity, and also includes a second s2 position capillary and a second e2 position capillary, the second s2 position capillary is connected to the S pipe, the second s2 position capillary is connected to the slider cavity through the S pipe, the second e2 position capillary is connected to the first cavity, the slider can be switched between three working positions, and is configured as follows:

[0010] Located at the first working position, the first pilot valve component is in a power-off state, the second pilot valve component is in a power-on state, the first cavity and the second cavity form a high-pressure state, the third cavity forms a low-pressure state, the E interface and the S interface are in communication with the slider inner cavity, the C interface is not in communication with the slider inner cavity, the slider inner cavity has a first projection on the plane where the upper surface of the valve seat is located, the first projection covers at least a portion of the E interface, and the first projection covers at least a portion of the S interface;

[0011] Located at the second working position, the first pilot valve component and the second pilot valve component are both in an energized state, the first cavity forms a high-pressure state, the second cavity forms a low-pressure state, the third cavity forms a high-pressure state, the E interface, the S interface and the C interface are all connected to the inner cavity of the slider, the inner cavity of the slider has a second projection on the plane where the upper surface of the valve seat is located, the second projection completely covers the S interface, the second projection covers at least a portion of the E interface, and the second projection covers at least a portion of the C interface;

[0012] Located in the third working position, the first pilot valve component is in an energized state, the second pilot valve component is in an off-power state, the first cavity and the second cavity form a low-pressure state, the third cavity forms a high-pressure state, the S interface and the C interface are connected to the slider cavity, the E interface is not connected to the slider cavity, the slider cavity has a third projection on the plane where the valve seat upper surface is located, the third projection covers at least part of the S interface, and the third projection covers at least part of the C interface.

[0013] The present invention also provides a refrigeration system, comprising a compressor, an indoor heat exchanger, and a four-way valve, wherein the inlet of the compressor is connected to the S port of the four-way valve; further comprising an electromagnetic switching valve, a first outdoor heat exchanger, and a second outdoor heat exchanger, wherein the electromagnetic switching valve is the electromagnetic switching valve described above;

[0014] The outlet pipeline of the compressor is divided into two branches, the first branch is connected to the D port of the four-way valve, and the second branch is connected to the D interface of the electromagnetic switching valve;

[0015] The C port of the four-way valve is connected to an interface of the indoor heat exchanger, and the E port is connected to the S interface of the electromagnetic switching valve;

[0016] The E interface and the C interface of the electromagnetic switching valve are respectively connected to an interface of the first outdoor heat exchanger and an interface of the second outdoor heat exchanger;

[0017] Another interface of the first outdoor heat exchanger and another interface of the second outdoor heat exchanger are connected to another interface of the indoor heat exchanger through a pipeline;

[0018] The second branch is also provided with a flow regulating valve.

[0019] The present invention provides an electromagnetic switching valve and a refrigeration system thereof. The electromagnetic switching valve has three working positions through an optimized design of its structure. Under the premise of not changing the heating state of the indoor unit, the defrosting work of the outdoor unit can be realized, thereby relatively reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the principle of the refrigeration system in the refrigeration mode in the specific embodiment provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the principle of the refrigeration system in the heating mode in the specific embodiment provided by the present invention;

[0022] Figure 3 It is a schematic diagram of the principle of the refrigeration system in the first defrost mode in a specific embodiment provided by the present invention;

[0023] Figure 4 It is a schematic diagram of the principle of the refrigeration system in the second defrost mode according to a specific embodiment of the present invention;

[0024] Figures 5 to 7 They are structural schematic diagrams of the electromagnetic switching valve in a specific embodiment in the first working mode, the second working mode and the third working mode;

[0025] Figure 8a and Figure 8b They are partial schematic diagrams of the first pilot valve component of the electromagnetic switching valve in a specific embodiment in a power-on state and a power-off state;

[0026] Figure 9a and Figure 9b They are partial schematic diagrams of the second pilot valve component of the electromagnetic switching valve in a power-on state and a power-off state in a specific embodiment;

[0027] Fig.10 and Fig.11 A partial schematic diagram of a first embodiment of the matching structure of a valve body component and a sliding member is shown, wherein: Fig.10 The middle sliding member is in the first position, Fig.11 The middle slide is in a second position;

[0028] Fig.12 and Fig.13 A partial schematic diagram of a second embodiment of the valve body component and the sliding member matching structure is shown, wherein: Fig.12 The middle sliding member is in the first position, Fig.13 The middle slide is in a second position;

[0029] Fig.14 and Fig.15 A partial schematic diagram of a third embodiment of the valve body component and the sliding member matching structure is shown, wherein: Fig.14 The middle sliding member is in the first position, Fig.15 The middle slide is in a second position;

[0030] Fig.16a , Fig.16b and Fig.16cThe schematic diagrams respectively show the structure of the slider in the first working position, the second working position and the third working position in the first embodiment of the valve seat and the slider matching structure;

[0031] Fig.17a , Fig.17b and Fig.17c The schematic diagrams respectively show the structure of the slider in the first working position, the second working position and the third working position in the first embodiment of the valve seat and the slider matching structure;

[0032] Fig.18a , Fig.18b and Fig.18c The schematic diagrams respectively show the structure of the slider in the first working position, the second working position and the third working position in the first embodiment of the valve seat and the slider matching structure;

[0033] Fig.19 A schematic structural diagram of another embodiment of the electromagnetic switching valve provided by the present invention;

[0034] Figures 20a to 20d Four matching relationships between the slider and the valve seat when the electromagnetic switching valve is in the first working position are illustrated;

[0035] Figures 21a to 21d Four matching relationships between the slider and the valve seat when the electromagnetic switching valve is in the second working position are illustrated;

[0036] Figures 22a to 22d Four matching relationships between the slider and the valve seat when the electromagnetic switching valve is in the third working position are illustrated.

[0037] Description of reference numerals:

[0038] Compressor 101, indoor heat exchanger 102, first outdoor heat exchanger 131, second outdoor heat exchanger 132, four-way valve 104, electromagnetic switching valve 105, flow regulating valve 106;

[0039] The first cavity Q1, the second cavity Q2, the third cavity Q3, and the main valve cavity Q4;

[0040] A first valve body 211, a main body 2111, a connecting portion 2112, a second valve body 212, a first end cover 213, a second end cover 214, a transfer seat 215, a first step portion 2151, a second step portion 2152, and an axial protrusion 2153;

[0041] Valve seat 202;

[0042] Slider 203, slider inner cavity 203a, first cavity side wall 231, second cavity side wall 232;

[0043] Connecting rod assembly 204, connecting rod 241, first piston component 242, second piston component 243;

[0044] Sliding member 205, isolating portion 251, piston bowl 2511, isolating block 2512, sealing ring 2513, limiting portion 252, connecting rod 253;

[0045] A first pilot valve component 206, a first pilot valve sleeve 261, a first pilot valve seat 262, a first pilot valve bowl 263, a first coil 264, a first static iron core 265, a first moving iron core 266, a first resetting elastic member 267, and a first connecting frame 268;

[0046] The second pilot valve component 207 , the second pilot valve sleeve 271 , the second pilot valve seat 272 , the first interface 272 a , the second interface 272 b , the second pilot valve bowl 273 , the second coil 274 , the second static iron core 275 , the second moving iron core 276 , the second reset elastic member 277 , and the second connecting frame 278 . DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] For ease of understanding and concise description, the electromagnetic switching valve and the refrigeration system having the same are explained below, and the beneficial effects are not repeated.

[0049] Please refer to Figures 1 to 4 , Figure 1 It is a schematic diagram of the principle of the refrigeration system in the refrigeration mode in the specific embodiment provided by the present invention; Figure 2 It is a schematic diagram of the principle of the refrigeration system in the heating mode in the specific embodiment provided by the present invention; Figure 3 It is a schematic diagram of the principle of the refrigeration system in the first defrost mode in a specific embodiment provided by the present invention; Figure 4 It is a schematic diagram of the principle of the refrigeration system in the second defrost mode in a specific embodiment provided by the present invention.

[0050] As shown in the figure, in this embodiment, the refrigeration system includes a compressor 101 , an indoor heat exchanger 102 , a first outdoor heat exchanger 131 , a second outdoor heat exchanger 132 , a four-way valve 104 and an electromagnetic switching valve 105 .

[0051] Among them, the four-way valve 104 is a currently common four-way valve structure, which has only two working positions, namely the working position where its E port is connected to the S port and the D port is connected to the C port, and the working position where the E port is connected to the D port and the S port is connected to the C port.

[0052] The electromagnetic switching valve 105 is an electromagnetic switching valve improved on the basis of the existing four-way valve in the present invention, and has three working positions, which will be specifically described in the working mode of the refrigeration system introduced below.

[0053] Among them, the inlet of the compressor 101 is connected to the S port of the four-way valve 104, and the outlet pipeline of the compressor 101 is divided into two branches. The first branch is connected to the D port of the four-way valve 104, and the second branch is connected to the D interface of the electromagnetic switching valve 105. A throttle valve 106 is also provided on the second branch. Specifically, the throttle valve 106 can select an expansion valve to adjust the flow rate of the refrigerant on each branch to ensure the normal operation of the refrigeration system.

[0054] The C port of the four-way valve 104 is connected to an interface of the indoor heat exchanger 102 , and the E port is connected to the S port of the electromagnetic switching valve 105 .

[0055] The E port of the electromagnetic switching valve 105 is in communication with one port of the first outdoor heat exchanger 131 , and the C port of the electromagnetic switching valve 105 is in communication with one port of the second outdoor heat exchanger 132 .

[0056] Another interface of the first outdoor heat exchanger 131 and another interface of the second outdoor heat exchanger 132 are connected to another interface of the indoor heat exchanger through a pipeline, and a throttling element is provided on the pipeline.

[0057] As configured above, the working modes of the refrigeration system include a cooling mode, a heating mode and a defrosting mode, wherein the defrosting mode has two situations, which are described one by one below.

[0058] Cooling mode

[0059] like Figure 1 As shown, in the cooling mode, the four-way valve 104 is in the working position where the D port is connected to the E port and the C port is connected to the S port, and the electromagnetic switching valve 105 is in the working position where the E port, the S port and the C port are connected to each other.

[0060] Since the D interface of the electromagnetic switching valve 105 is in a closed state, in actual application, the flow regulating valve 106 can be closed. Of course, it is also feasible to adjust the flow regulating valve 106 to a smaller opening. The high-temperature and high-pressure refrigerant at the outlet of the compressor 101 mainly flows to the D port of the four-way valve 104 through the first branch, and then flows to the S interface of the electromagnetic switching valve 105 through the E port of the four-way valve 104. Since the S interface of the electromagnetic switching valve 105 is connected to its E interface and C interface, the refrigerant flowing into the S interface is divided into two paths, flowing into the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132 through the E interface and the C interface respectively. At this time, the two outdoor heat exchangers are in the heating state. After passing through the outdoor heat exchanger, the refrigerant is converted into a low-temperature and low-pressure state through the throttling element, and passes through the indoor heat exchanger 102. At this time, the indoor heat exchanger 102 is in a cooling state, and finally returns to the compressor 101 through the four-way valve 104.

[0061] Heating mode

[0062] like Figure 2 As shown, in the heating mode, the four-way valve 104 is in the working position where the D port is connected to the C port and the E port is connected to the S port, and the electromagnetic switching valve 105 is in the working position where the E port, the S port and the C port are connected to each other.

[0063] Since the D interface of the electromagnetic switching valve 105 is in a closed state, in actual application, the flow regulating valve 106 can be closed, and of course the flow regulating valve 106 can also be adjusted to a smaller opening; the high-temperature and high-pressure refrigerant at the outlet of the compressor 101 mainly flows to the D port of the four-way valve 104 through the first branch, and then flows to the indoor heat exchanger 102 through the C port of the four-way valve 104. At this time, the indoor heat exchanger 103 is in a heating state, and then the refrigerant becomes a low-temperature and low-pressure state after passing through the throttling element, and flows into the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132 respectively. At this time, both outdoor heat exchangers are in a cooling state, and the refrigerant flowing out of the two outdoor heat exchangers flows to the E interface and C interface of the electromagnetic switching valve 105 respectively, flows to the four-way valve 104 through the S interface of the electromagnetic switching valve 105, and finally returns to the compressor 101.

[0064] First defrost mode

[0065] like Figure 3 As shown, in the first defrost mode, the four-way valve 104 is in the working position where the D port is connected to the C port and the E port is connected to the S port, and the solenoid switch valve 105 is in the working position where the E port is connected to the S port and the D port is connected to the C port.

[0066] The flow regulating valve 106 can adjust its opening according to the defrosting demand, while also ensuring the heating effect of the indoor heat exchanger 102.

[0067] The high-temperature and high-pressure refrigerant at the outlet of the compressor 101 is divided into two branches. A part of the refrigerant is regulated by the flow regulating valve 106 and flows into the second outdoor heat exchanger 132 through the passage from the D interface to the C interface of the electromagnetic switching valve 105. At this time, the second outdoor heat exchanger 132 is in a defrosting state. The refrigerant flowing out of the second outdoor heat exchanger 132 will flow to the first outdoor heat exchanger 131 due to the pressure difference, and return to the first outdoor heat exchanger 131 through the passage from the E interface to the S interface of the electromagnetic switching valve 105 and the passage from the E port to the S port of the four-way valve 104. Compressor 101; another part of the refrigerant at the outlet end of the compressor 101 flows to the indoor heat exchanger 102 through the passage from port D to port C of the four-way valve 104, and the indoor heat exchanger 102 is in a heating state. The refrigerant flowing out of the indoor heat exchanger 102 becomes a low-temperature and low-pressure state after passing through the throttling element, and flows through the first outdoor heat exchanger 131. The first outdoor heat exchanger 131 is in a cooling state. The refrigerant flowing out of the first outdoor heat exchanger 131 finally returns to the compressor 101 through the electromagnetic switching valve 105 and the four-way valve 104.

[0068] Second defrost mode

[0069] like Figure 4 As shown, in the second defrost mode, the four-way valve 104 is in the working position where the D port is connected to the C port and the E port is connected to the S port, and the solenoid switch valve 105 is in the working position where the D port is connected to the E port and the C port is connected to the S port.

[0070] The flow regulating valve 106 can adjust its opening according to the defrosting demand, while also ensuring the heating effect of the indoor heat exchanger 102.

[0071] The high-temperature and high-pressure refrigerant at the outlet of the compressor 101 is divided into two branches. A part of the refrigerant is regulated by the flow regulating valve 106 and flows into the first outdoor heat exchanger 131 through the passage from the D interface to the E interface of the electromagnetic switching valve 105. At this time, the first outdoor heat exchanger 131 is in a defrosting state. The refrigerant flowing out of the first outdoor heat exchanger 131 will flow to the second outdoor heat exchanger 132 due to the pressure difference, and return through the passage from the C interface to the S interface of the electromagnetic switching valve 105 and the passage from the E port to the S port of the four-way valve 104. To the compressor 101; another part of the refrigerant at the outlet end of the compressor 101 flows to the indoor heat exchanger 102 through the passage from port D to port C of the four-way valve, and the indoor heat exchanger 102 is in a heating state. The refrigerant flowing out of the indoor heat exchanger 102 becomes a low-temperature and low-pressure state after passing through the throttling element, and flows through the second outdoor heat exchanger 132. The second outdoor heat exchanger 132 is in a cooling state. The refrigerant flowing out of the second outdoor heat exchanger 132 finally returns to the compressor 101 through the electromagnetic switching valve 105 and the four-way valve 104.

[0072] As can be seen from the above, by dividing the outdoor heat exchanger into two parts and combining the electromagnetic switching valve 105 with three working positions provided by the present invention with the conventional four-way valve 104, the refrigeration system can have conventional cooling mode and heating mode, and can also defrost the outdoor heat exchanger without affecting the heating of the indoor heat exchanger 102.

[0073] It can be seen from the working modes of the above refrigeration system that the electromagnetic switching valve 105 provided by the present invention can be switched between three working positions, specifically, its slider can be switched between three working positions relative to the valve seat:

[0074] The slider is located in the first working position, the E interface and the S interface of the valve seat are connected through the inner cavity of the slider, and the C interface is not connected to the inner cavity of the slider, that is, the C interface is connected to the D interface through the valve cavity; it can be understood that the first working position is the working position of the electromagnetic switching valve 105 in the first defrost mode of the above-mentioned refrigeration system;

[0075] The slider is located in the second working position, and the E interface, S interface and C interface of the valve seat are all connected to the inner cavity of the slider, that is, the E interface, S interface and C interface are connected to each other; it can be understood that the second working position is the working position of the electromagnetic switching valve 105 in the cooling mode and the heating mode of the above-mentioned refrigeration system;

[0076] The slider is located in the third working position, the S interface and the C interface of the valve seat are connected through the inner cavity of the slider, and the E interface is not connected to the inner cavity of the slider, that is, the E interface is connected to the D interface through the valve cavity; it can be understood that the third working position is the working position of the electromagnetic switching valve 105 in the second defrost mode in the above-mentioned refrigeration system.

[0077] The specific structure of the electromagnetic switching valve provided by the present invention is described in detail below with reference to the accompanying drawings.

[0078] Please refer to Figures 5 to 7 , Figures 5 to 7 They are schematic diagrams of the structures of the electromagnetic switching valve in the first working mode, the second working mode and the third working mode in a specific embodiment respectively.

[0079] In this embodiment, the electromagnetic switching valve includes a main valve and a pilot valve.

[0080] The main valve of the electromagnetic switching valve includes a valve body component having a valve cavity, a valve seat 202 , a slider 203 and a connecting rod assembly 204 .

[0081] The valve body component has a D interface connected to the valve cavity; the valve seat 202 is provided with an E interface, an S interface and a C interface; the connecting rod assembly 204 includes a connecting rod 241 and a first piston component 242 and a second piston component 243 fixed at both ends of the connecting rod 241; the slider 203 has a slider inner cavity 203a, the bottom surface of the slider 203 is pressed and fitted with the valve seat 202, and can slide along the valve seat 202 under the drive of the connecting rod assembly 204.

[0082] In this embodiment, the main valve further includes a sliding member 205 , and the sliding member 205 includes an isolation portion 251 .

[0083] In this embodiment, the valve cavity includes a large diameter cavity and a small diameter cavity, and the aforementioned valve seat 202, slider 203 and connecting rod assembly 204 are arranged in the small diameter cavity; the isolation part 251 of the sliding member 205 is located in the large diameter cavity, and the sliding member 205 can slide in the valve cavity to approach or move away from the valve seat 202.

[0084] The pilot valve of the electromagnetic switching valve specifically includes a first pilot valve component 206 and a second pilot valve component 207, which cooperate to change the pressure difference at both ends of the connecting rod assembly 204 and the pressure difference at both ends of the sliding member 205, so as to switch the sliding direction of the slider 202 and the sliding direction of the sliding member 205, so that the slider 202 can switch between the aforementioned three working positions.

[0085] Obviously, the two piston parts of the connecting rod assembly 204 are respectively matched with the sliding seal of the valve cavity. In this embodiment, the isolation part 251 of the sliding member 205 is matched with the sliding seal of the valve cavity. In this way, the two can slide by controlling the pressure difference at both ends of the connecting rod assembly 204 and the pressure difference at both ends of the isolation part 251.

[0086] In a specific configuration, the first piston component 242 of the connecting rod assembly 204 is disposed relatively close to the sliding member 205 , and the second piston component 243 is disposed relatively far from the sliding member 205 .

[0087] It can be understood that after the above arrangement, the valve cavity of the valve body component is divided into four cavities sealed with each other, namely, the first cavity Q1 formed between the isolation portion 251 of the sliding member 205 and one end wall of the valve body component, the second cavity Q2 formed between the isolation portion 251 and the second piston component 242, the third cavity Q3 formed between the first piston component 241 and the other end wall of the valve body component, and the main valve cavity Q4 formed between the first piston component 241 and the second piston component 242.

[0088] That is, the first pilot valve member 206 and the second pilot valve member 207 can change the pressure difference between the second cavity Q2 and the third cavity Q3 and the pressure difference between the first cavity Q1 and the second cavity Q2 , thereby switching the sliding direction of the slider 203 and the sliding member 205 .

[0089] Specifically, the D interface of the valve body component is in communication with the main valve chamber Q4. It can be understood that in the refrigeration system, the D interface is connected to the high-pressure end of the system, that is, the main valve chamber Q4 is always connected to high pressure.

[0090] Specifically, the first pilot valve component 206 changes the pressure difference at both ends of the connecting rod assembly 204, that is, the pressure difference between the second cavity Q2 and the third cavity Q3. The second pilot valve component 207 changes the pressure of the first cavity Q1. Combined with the pressure change of the second cavity Q2 by the first pilot valve component 206, the pressure difference control between the first cavity Q1 and the second cavity Q2 is achieved.

[0091] Please refer to Figure 8a and Figure 8b , Figure 8a and Figure 8b They are partial schematic diagrams of the first pilot valve component of the electromagnetic switching valve in a specific embodiment in a power-on state and a power-off state.

[0092] In this embodiment, the first pilot valve component 206 includes a first driving part, a first pilot valve sleeve 261 having a first sleeve cavity, a first pilot valve seat 262 and a first pilot valve bowl 263; the first pilot valve seat 262 and the first pilot valve bowl 263 are located in the first sleeve cavity, and the first pilot valve seat 261 has a first connection port, a second connection port and a third connection port.

[0093] The first pilot valve bowl 263 is pressed and fitted with the first pilot valve seat 262. Under the drive of the first driving unit, the first pilot valve bowl 263 can slide along the first pilot valve seat 262 to switch between two working positions, and is configured as follows:

[0094] Located at the first station, the first connection port is connected to the second connection port through the inner cavity of the first pilot valve bowl 263, and the third connection port is connected to the first sleeve cavity;

[0095] Located at the second working position, the first connecting port is communicated with the first sleeve cavity, and the second connecting port is communicated with the third connecting port through the inner cavity of the first pilot valve bowl 263 .

[0096] Among them, the first connecting port (the connecting port on the left side in the figure) is connected to the second cavity Q2 of the main valve through the first e1 capillary, the second connecting port (the connecting port in the middle in the figure) is connected to the S interface of the main valve through the first s1 capillary, the third connecting port (the connecting port on the right side in the figure) is connected to the third cavity Q3 of the main valve through the first c1 capillary, and the first set of cavities is connected to the D interface of the main valve through the first d1 capillary.

[0097] In a specific scheme, the first driving part includes a first coil 264, a first static iron core 265, a first moving iron core 266, a first reset elastic member 267 and a first connecting frame 268; wherein, the first reset elastic member 267 is arranged between the first static iron core 265 and the first moving iron core 266, and the first connecting frame 268 connects the first moving iron core 266 and the first guide valve bowl 263. By turning on and off the power of the first coil 264 and combining with the first reset elastic member 267, the first moving iron core 266 is controlled to drive the first connecting frame 268 to move, so as to drive the first guide valve bowl 263 to slide, thereby controlling the connectivity between the interfaces, and further controlling the pressure of the second cavity Q2 and the third cavity Q3 of the main valve.

[0098] In the illustrated scheme, the first pilot valve component 206 is in the first working position when it is powered off. At this time, the second cavity Q2 of the main valve is connected to the S interface through the first e1 capillary, the first connecting port, the second connecting port, and the first s1 capillary, and the second cavity Q2 is in a low-pressure state. The third cavity Q3 of the main valve is connected to the D interface through the first c1 capillary, the third connecting port, the first sleeve cavity, and the first d1 capillary, and the third cavity Q3 is in a high-pressure state.

[0099] When the first pilot valve component 206 is powered on, it is located in the second working position. At this time, the second cavity Q2 of the main valve is connected to the D interface through the first e1 position capillary, the first connecting port, the first sleeve cavity, the first d1 position capillary, and the second cavity Q2 is in a high-pressure state. The third cavity Q3 of the main valve is connected to the S interface through the first c1 position capillary, the third connecting port, the second connecting port, and the first s1 position capillary, and the third cavity Q3 is in a low-pressure state.

[0100] Please refer to Figure 9a and Figure 9b , Figure 9a and Figure 9b They are partial schematic diagrams of the second pilot valve component of the electromagnetic switching valve in a specific embodiment in a power-on state and a power-off state.

[0101] In this embodiment, the second pilot valve component 207 includes a second driving part, a second pilot valve sleeve 271 having a second sleeve cavity, a second pilot valve seat 272 and a second pilot valve bowl 273; the second pilot valve seat 272 and the second pilot valve bowl 273 are located in the second sleeve cavity, and the second pilot valve seat 272 has a first interface and a second interface.

[0102] The second pilot valve bowl 273 is pressed and fitted with the second pilot valve seat 272. Under the drive of the second driving unit, the second pilot valve bowl 273 can slide along the second pilot valve seat 272 to switch between two states, and is configured as follows:

[0103] In the first state, the first interface and the second interface are connected through the inner cavity of the second pilot valve bowl 273;

[0104] In the second state, the first interface is communicated with the second sleeve cavity, and the second interface is communicated with the inner cavity of the second pilot valve bowl 273 .

[0105] Among them, the first interface (the interface on the left side in the figure) is connected to the first cavity Q1 of the main valve through the second e2 capillary, the second interface (the interface on the right side in the figure) is connected to the S interface of the main valve through the second s2 capillary, and the second sleeve cavity is connected to the D interface of the main valve through the second d2 capillary.

[0106] In a specific scheme, the second driving part includes a second coil 274, a second static iron core 275, a second moving iron core 276, a second reset elastic member 277 and a second connecting frame 278; wherein, the second reset elastic member 277 is arranged between the second static iron core 275 and the second moving iron core 276, and the second connecting frame 278 connects the second moving iron core 276 and the second guide valve bowl 273. In this way, by turning on and off the power of the second coil 274 and combining with the second reset elastic member 277, the second moving iron core 276 is controlled to drive the second connecting frame 278 to move, so as to drive the second guide valve bowl 273 to slide, thereby controlling the connectivity between the interfaces, and further controlling the pressure state in the first cavity Q1 of the main valve.

[0107] like Figure 9a As shown, the second coil 274 (marked at Figure 5(in the power-on state, the second moving iron core 276 and the second static iron core 275 are attracted to drive the second pilot valve bowl 273 to slide towards the second static iron core 275, and the second reset elastic member 277 is compressed to store deformation energy. The inner cavity of the second pilot valve bowl 273 is connected to the first interface and the second interface of the second pilot valve seat, and the second pilot valve component 207 is in the first state. At this time, the first cavity Q1 of the main valve is connected to the S interface through the first interface, the second interface, and the second s2 position capillary, and the first cavity Q1 is in a low-pressure state.

[0108] like Figure 9b As shown, when the second coil 274 of the second pilot valve component 207 is in the power-off state, under the elastic force of the second reset elastic member 277, the second moving iron core 275 drives the second pilot valve bowl 273 to slide in the direction away from the second static iron core 275, the first interface is connected with the first sleeve cavity, the second interface is connected with the inner cavity of the second pilot valve bowl 273, and the second pilot valve component 207 is in the second state. At this time, the first cavity Q1 of the main valve is connected with the D interface through the first interface, the second sleeve cavity, and the second d2 position capillary, and the first cavity Q1 is in a high-pressure state.

[0109] The electromagnetic switching valve also includes a stopper for limiting the sliding position of the sliding member 205. Specifically, under the pressure difference between the first cavity Q1 and the second cavity Q2, the sliding member 205 can switch between two positions. At the same time, combined with the pressure difference between the second cavity Q2 and the third cavity Q3, the slider 203 can switch between the aforementioned three working positions.

[0110] like Figure 5 As shown, the first pilot valve component 206 is in the power-off state, and the second pilot valve component 207 is in the power-on state, that is, the first cavity Q1 is in the low-pressure state, the second cavity Q2 is in the low-pressure state, and the third cavity Q3 is in the high-pressure state. In this way, the connecting rod assembly 204 drives the slider 203 to move toward the left side (in the illustrated orientation) and pushes the sliding member 205 to move toward the left side, until the sliding member 205 abuts against the corresponding side end wall of the valve body component and is in the first position. The connecting rod assembly 204 abuts against the sliding member 205, so that the slider 203 is in the aforementioned first working position, the E interface is connected to the S interface through the inner cavity of the slider 203, and the C interface is connected to the D interface through the main valve cavity Q4, that is, the working position of the electromagnetic switching valve in the first defrost mode in the aforementioned refrigeration system.

[0111] like Figure 6As shown, the first pilot valve component 206 and the second pilot valve component 207 are both in the power-off state, that is, the first cavity Q1 is in the high-pressure state, the second cavity Q2 is in the low-pressure state, and the third cavity Q3 is in the high-pressure state. In this way, the sliding member 205 moves toward the right side to the second position against the stopper under the action of the pressure difference at both ends thereof, and the connecting rod assembly 204 drives the slider 203 to move toward the left side until it is against the slider 205, so that the slider 203 is in the aforementioned second working position, the E interface, the S interface and the C interface are interconnected through the inner cavity of the slider 203, and the D interface is not connected with the E interface, the S interface and the C interface, that is, the working position of the electromagnetic switching valve in the cooling mode and the heating mode in the aforementioned refrigeration system.

[0112] like Figure 7 As shown, the first pilot valve component 206 is in an energized state, and the second pilot valve component 207 is in an off-power state, that is, the first cavity Q1 is in a high-pressure state, the second cavity Q2 is in a high-pressure state, and the third cavity Q3 is in a low-pressure state. At this time, the sliding member 205 remains in the second position against the stopper, and the connecting rod assembly 204 drives the slider 203 to move to the right to abut against the corresponding side end wall of the valve body component, so that the slider 203 is in the aforementioned third working position, the S interface is connected to the C interface through the inner cavity of the slider 203, and the E interface is connected to the D interface through the main valve cavity Q4, that is, the working position of the solenoid switching valve in the second defrost mode in the aforementioned refrigeration system.

[0113] It can be understood that, in specific settings, the structures of the stopper, the sliding member 205 and the connecting rod assembly 204 should be coordinated so that the three can cooperate to achieve corresponding functions in the states of the aforementioned working positions.

[0114] In actual setting, when the connecting rod assembly 204 drives the slider 203 to slide, and when the sliding member 205 slides, there is friction resistance between the connecting rod assembly 204 and the valve body component. Therefore, in order to ensure that the connecting rod assembly 204 and the sliding member 205 can move as described above under the action of the corresponding pressure difference, it is necessary to limit the parameters of the large diameter cavity and the small diameter cavity of the valve body component. The following is a detailed description, and the parameters involved include: the radius R1 of the large diameter cavity, the radius R2 of the small diameter cavity, the minimum operating pressure difference ΔP when the system is running, and the friction force F of the connecting rod assembly 204. f , the friction force F of the sliding member 205 f '.

[0115] When the electromagnetic switching valve is in the second working position, the first pilot valve component 206 and the second pilot valve component 207 are both in the power-off state, the sliding member 205 is in the second position, and the connecting rod assembly 204 and the sliding member 205 are against each other; when switching from the second working position to the first working position, the first pilot valve component 206 does not move, the second pilot valve component 207 changes from power-off to power-on, and the pressure of the first cavity Q1 changes from high pressure to low pressure, which should satisfy πR2 2 ΔP>Ff +F f 'To ensure reliable commutation.

[0116] When the electromagnetic switching valve switches from the first working position to the second working position, the first pilot valve component 206 does not move, the second pilot valve component 207 changes from energized to de-energized, and the pressure of the first cavity Q1 changes from low pressure to high pressure, which should satisfy π(R1 2 -R2 2 )ΔP>F f +F f 'To ensure reliable commutation.

[0117] When the electromagnetic switching valve switches from the second working position to the third working position, the first pilot valve component 206 changes from off to on, the second pilot valve component 207 does not move, the pressure of the second cavity Q2 changes from low pressure to high pressure, and the pressure of the third cavity Q3 changes from high pressure to low pressure, which should satisfy πR2 2 ΔP>F f To ensure reliable commutation.

[0118] When the electromagnetic switching valve switches from the third working position to the second working position, the first pilot valve component 206 changes from energized to de-energized, the second pilot valve component 207 does not move, the pressure of the second cavity Q2 changes from high pressure to low pressure, and the pressure of the third cavity Q3 changes from low pressure to high pressure, which should satisfy πR2 2 ΔP>F f To ensure reliable commutation.

[0119] When the electromagnetic switching valve switches from the first working position to the third working position, the second pilot valve component 207 is first switched from energized to de-energized, and the pressure of the first cavity Q1 changes from low pressure to high pressure, which should satisfy π(R1 2 -R2 2 )ΔP>F f +F f ', switch to the second working position, the first pilot valve component 206 is powered on again from off, the pressure of the second cavity Q2 changes from low pressure to high pressure, and the pressure of the third cavity Q3 changes from high pressure to low pressure, which should satisfy πR2 2 ΔP>F f To ensure reliable commutation.

[0120] When the electromagnetic switching valve switches from the third working position to the first working position, the first pilot valve component 206 is first energized to be de-energized, the pressure of the second cavity Q2 changes from high pressure to low pressure, and the pressure of the third cavity Q3 changes from low pressure to high pressure, which should satisfy πR2 2 ΔP>F f , switch to the second working position, the second pilot valve component 207 changes from power off to power on, the pressure of the first cavity Q1 changes from high pressure to low pressure, and πR2 should be satisfied 2 ΔP>F f +Ff 'To ensure reliable commutation.

[0121] As can be seen from the above, in order to ensure reliable switching, the radius of the valve cavity where the isolation portion 251 of the sliding member 205 is located must be greater than the radius of the valve cavity where the connecting rod assembly 204 is located. Therefore, when setting, the valve cavity of the valve body component is divided into the aforementioned large-diameter cavity and small-diameter cavity, and at the same time, π(R1 2 -R2 2 )ΔP>F f +F f '.

[0122] It can be understood that the minimum operating pressure difference ΔP when the system is running is determined according to the system requirements of the actual application, and the relevant friction force is related to the material of the relevant components and can be determined according to the actual application.

[0123] In this embodiment, the valve body component of the main valve specifically includes a first valve body 211, a second valve body 212, a first end cover 213 and a second end cover 214, wherein the first valve body 211 and the second valve body 212 are both cylindrical structures, the adjacent ends of the two are fixedly connected, and the inner cavities of the two are connected, the first end cover 213 blocks the opening of the first valve body 211, and the second end cover 214 blocks the opening of the second valve body 212, the aforementioned large-diameter cavity is formed in the first valve body 211, and the small-diameter cavity is formed in the second valve body 212, that is, the diameter of the first valve body 211 is greater than the diameter of the second valve body 212; it can be understood that after such arrangement, the first end cover 213 is an end wall of the aforementioned valve body component, and the second end cover 214 is the other end wall of the valve body component, specifically, the first cavity Q1 is formed between the first end cover 213 and the sliding member 205, and the third cavity Q3 is formed between the second piston component 242 and the second end cover 214.

[0124] Based on the structure of the above-mentioned valve body component, in this example, the aforementioned stopper for limiting the sliding member 205 is arranged at the connection between the first valve body 211 and the second valve body 212 .

[0125] Several implementations of the fixed connection between the first valve body 211 and the second valve body 212 and several implementations of the stopper and the isolation portion 251 are described in detail below.

[0126] Please refer to Fig.10 and Fig.11 , Fig.10 and Fig.11 A partial schematic diagram of a first embodiment of the matching structure of a valve body component and a sliding member is shown, wherein: Fig.10 The middle sliding member is in a first position, Fig.11 The middle slide is in the second position.

[0127] Fig.10 and Fig.11In the illustrated embodiment, the first valve body 211 and the second valve body 212 are fixedly connected via a transfer seat 215 having a through hole.

[0128] The adapter seat 215 includes a first step portion 2151 and a second step portion 2152; the first step portion 2151 has a first step surface facing the first valve body 211, and the first valve body 211 is fixedly sleeved on the first step portion 2151 and abuts against the first step surface. Specifically, the two can be fixed by welding; the second step portion 2152 has a second step surface facing the second valve body 212, and the second valve body 212 is fixedly sleeved on the second step portion 2152 and abuts against the second step surface. Specifically, the two are also fixed by welding. In addition, in actual setting, the second valve body 212 can also be fixedly sleeved on the second step portion 2152.

[0129] It can be understood that the first step portion 2151 has a certain length in the axial direction so that the first valve body 211 and the adapter seat 215 have a certain fitting length, and the second step portion 2152 also has a certain length in the axial direction so that the second valve body 212 and the adapter seat 215 also have a certain fitting length, so as to ensure the stability and reliability of the fixation of the adapter seat 215 to the first valve body 211 and the second valve body 212.

[0130] In this solution, the first step portion 2151 forms the aforementioned stopper toward the end surface of the first end cover 213. Fig.11 As shown, when the sliding member 205 is in the second position, it abuts against the end surface of the first step portion 2151; in addition, as shown Fig.10 As shown, the sliding member 205 abuts against the first end cover 213 when in the first position.

[0131] It can be understood that in actual setting, the first valve body 211 can also be fixed inside the first step portion 2151. At this time, the adapter seat 215 can be provided with a protrusion extending toward the first end cover 213 to form a stopper to limit the sliding position of the sliding member 205.

[0132] In this solution, the isolation portion 251 of the sliding member 205 is specifically a piston bowl 2511 , and the opening direction of the piston bowl 2511 faces the first end cover 213 .

[0133] According to the various working positions of the aforementioned electromagnetic switching valve, it can be known that in actual applications, under normal working conditions, the pressure of the first cavity Q1 is higher than that of the second cavity Q2, or is consistent with that of the second cavity Q2, and the piston bowl 2511 is a one-way sealing structure, so a piston bowl 2511 is provided and its opening is facing the first cavity Q1 to meet the sealing requirements.

[0134] Please refer to Fig.12 and Fig.13 , Fig.12 and Fig.13A partial schematic diagram of a second embodiment of the valve body component and the sliding member matching structure is shown, wherein: Fig.12 The middle sliding member is in the first position, Fig.13 The middle slide is in the second position.

[0135] Fig.12 and Fig.13 In the illustrated scheme, the first valve body 211 and the second valve body 212 are directly connected, wherein the first valve body 211 includes a main body portion 2111 and a connecting portion 2112, wherein the connecting portion 2112 has a diameter smaller than that of the main body portion 2111 and is used to connect with the first valve body 211, specifically, the outer sleeve of the first valve body 211 is fixed to the connecting portion 2112, and the two can be fixed specifically by welding.

[0136] At the same time, the connecting portion 2112 forms a stopper for limiting the sliding position of the sliding member 205. Fig.13 As shown, when the sliding member 205 is in the second position, it abuts against the connecting portion 2112 to achieve position limiting.

[0137] In this solution, the isolation portion 251 of the sliding member 205 specifically includes an isolation block 2512 and a sealing ring 2513 , and the isolation block 2512 and the first valve body 211 are sealed by the sealing ring 2513 .

[0138] In practical applications, Fig.10 and Fig.11 In the structure of the valve body component shown in FIG. 1 , the isolation portion 251 may be Fig.12 and Fig.13 Similarly, the structure shown in Fig.12 and Fig.13 In the structure of the valve body component shown in FIG. 1 , the isolation portion 251 may also be Fig.10 and Fig.11 The structure shown.

[0139] Please refer to Fig.14 and Fig.15 , Fig.14 and Fig.15 A partial schematic diagram of a third embodiment of the valve body component and the sliding member matching structure is shown, wherein: Fig.14 The middle sliding member is in the first position, Fig.15 The middle slide is in the second position.

[0140] Fig.14 and Fig.15 In the illustrated embodiment, the first valve body 211 and the second valve body 212 are fixedly connected via a transfer seat 215 having a through hole.

[0141] The adapter seat 215 includes a first step portion 2151 and a second step portion 2152, which are respectively sleeved and fixed with the first valve body 211 and the second valve body 212. The structure is similar to the above Fig.10 and Fig.11 The scheme shown is similar and will not be repeated here.

[0142] The difference between the two is that in this solution, the adapter seat 215 is further provided with an axial protrusion 2153 extending toward the first valve body 211, and the axial protrusion 2153 forms a stopper for limiting the sliding position of the sliding member 205. Fig.15 As shown, when the sliding member 205 is in the second position, it abuts against the axial protrusion 2153 to achieve positioning.

[0143] In this solution, the isolation part 251 of the sliding member 205 is specifically two fixedly connected piston bowls 2511, and the two piston bowls 2511 are arranged back to back. In this way, the isolation part 251 can achieve two-way sealing to ensure that related components are not damaged during abnormal operation.

[0144] On this basis, in order to prevent the isolation portion 251 of the sliding member 205 from damaging the corresponding piston bowl 2511 when the axial protrusion 2153 abuts against it, the diameter of the axial protrusion 2153 should be set smaller than the inner diameter of the piston bowl 2511 .

[0145] Above Figures 10 to 15 In the three embodiments shown, the sliding member 205 further includes a limiting portion 252 fixedly connected to the isolation portion 251. When in the second position, the sliding member 205 is specifically limited by the isolation portion 251 abutting against the stop portion. Figure 5 and Figure 6 When the connecting rod assembly 204 abuts against the sliding member 205 , it directly abuts against the limiting portion 252 .

[0146] In the illustrated scheme, the isolating portion 251 and the limiting portion 252 are connected by a connecting rod 253. The limiting portion 252 is specifically located in the small-diameter cavity, and its diameter is adapted to the small-diameter cavity, but it has a through hole to connect the chambers on both sides thereof. As mentioned above, the second cavity Q2 is formed between the isolating portion 251 and the second piston component 242, so the setting of the limiting portion 252 should not separate the cavity.

[0147] Of course, in actual configuration, if the limiting portion 252 is a solid structure, a gap should be left between its periphery and the wall of the valve chamber. The illustrated solution can ensure the stability of the overall movement of the sliding member 205.

[0148] It is understandable that in actual configuration, the sliding member 205 is not limited to the specific structure shown in the figure, as long as it can satisfy the requirements of separating the first cavity Q1 and the second cavity Q2 and limiting the sliding position of the connecting rod assembly 204 .

[0149] In addition to the above-mentioned methods, in actual configuration, the first valve body 211 and the second valve body 212 may also be an integrally formed structure.

[0150] Please refer again Figures 5 to 7 In order to make the electromagnetic switching valve have three working positions and ensure normal operation in each working position, the valve seat 202 and the slider 203 of the main valve need to have reasonable structural coordination.

[0151] Specifically, the E interface, S interface and C interface of the valve seat 202 are arranged in sequence, that is, the S interface is located between the E interface and the C interface. Of course, in actual settings, the arrangement of the E interface, S interface and C interface is not limited as long as the following conditions are met.

[0152] The slider 203 is in the first working position, the slider 203 does not completely cover the C interface of the valve seat 202, and the C interface is not connected to the slider inner cavity 203a, the slider 203 completely covers the E interface and the S interface of the valve seat 202, and the E interface and the S interface are both connected to the slider inner cavity 203a, so that the E interface can be connected to the S interface through the slider inner cavity 203a, and the C interface can be connected to the D interface through the valve cavity.

[0153] That is, the slider inner cavity 203a has a first projection on the plane where the upper surface of the valve seat 202 is located, and the first projection covers at least a portion of the E interface, the first projection covers at least a portion of the S interface, but the first projection does not cover the C interface.

[0154] Thus, there are the following four situations for the cooperation between the slider 203 and the valve seat 202:

[0155] First, the first projection of the slider inner cavity 203a (the cross-hatching portion in the figure) completely covers the E interface and the S interface. Fig.20a As shown;

[0156] Second, the first projection of the slider cavity 203a (the cross-hatching portion in the figure) completely covers the E interface and partially covers the S interface, such as Fig.20b As shown;

[0157] Third, the first projection of the slider cavity 203a (the hatched portion in the figure) completely covers the S interface and partially covers the E interface, such as Fig.20c As shown;

[0158] Fourth, the first projection of the slider cavity 203a (the hatched portion in the figure) partially covers the E interface and also partially covers the S interface. Fig.20d shown.

[0159] The slider 203 is in the second working position, the slider 203 completely covers the E interface, the S interface and the C interface of the valve seat 202, and the E interface, the S interface and the C interface are all connected to the slider inner cavity 203a.

[0160] That is, the slider inner cavity 203a has a second projection on the plane where the upper surface of the valve seat 202 is located, and the second projection completely covers the S interface, the second projection covers at least a portion of the E interface, and the second projection covers at least a portion of the C interface.

[0161] Thus, there are the following four situations for the cooperation between the slider 203 and the valve seat 202:

[0162] First, the second projection of the slider inner cavity 203a (the cross-section line portion in the figure) completely covers the E interface and the C interface, such as Fig.21a As shown;

[0163] Second, the second projection of the slider cavity 203a (the cross-section line portion in the figure) completely covers the C interface and partially covers the E interface, such as Figure 21b As shown;

[0164] Third, the second projection of the slider cavity 203a (the cross-section line portion in the figure) completely covers the E interface and partially covers the C interface, such as Fig.21c As shown;

[0165] Fourth, the second projection of the slider cavity 203a (the cross-hatching portion in the figure) partially covers the E interface and also partially covers the C interface. Fig.21d shown.

[0166] The slider 203 is in the third working position, the slider 203 does not completely cover the E interface of the valve seat 202, and the E interface is not connected to the slider inner cavity 203a, the slider 203 completely covers the S interface and the C interface of the valve seat 202, and the S interface and the C interface are both connected to the slider inner cavity 203a, so that the E interface can be connected to the D interface through the valve cavity, and the S interface can be connected to the C interface through the slider inner cavity 203a.

[0167] That is, the slider inner cavity 203a has a third projection on the plane where the upper surface of the valve seat 202 is located, the third projection covers at least a portion of the S interface, the third projection covers at least a portion of the C interface, and the third projection does not cover the E interface.

[0168] Thus, there are the following four situations for the cooperation between the slider 203 and the valve seat 202:

[0169] First, the third projection of the slider cavity 203a (the cross-section line portion in the figure) completely covers the S interface and the C interface, such as Fig.22a As shown;

[0170] Second, the third projection of the slider cavity 203a (the cross-section line portion in the figure) completely covers the C interface and partially covers the S interface, such as Figure 22b As shown;

[0171] Third, the third projection of the slider cavity 203a (the cross-section line portion in the figure) completely covers the S interface and partially covers the C interface, such as Fig.22c As shown;

[0172] Fourth, the third projection of the slider cavity 203a (the cross-section line portion in the figure) partially covers the S interface and also partially covers the C interface. Fig.22d shown.

[0173] In order to ensure that the inner cavity of the slider 203 can be connected with the E interface, the S interface and the C interface when the slider is in the second working position, the length of the slider 203 should be greater than the sum of the radius of the E interface, the distance between the E interface and the S interface, the distance between the S interface and the C interface, and the radius of the C interface.

[0174] Please refer to Fig.16a , Fig.16b and Fig.16c , Fig.16a , Fig.16b and Fig.16c The schematic diagrams respectively show the structure of the slider in the first working position, the second working position and the third working position in the first embodiment of the valve seat and slider matching structure.

[0175] like Fig.16b As shown, the length L2 of the slider 203 satisfies:

[0176] L2>(D1) / 2+L12+L23+(D3) / 2;

[0177] Among them, D1 is the diameter of the E interface, L12 is the distance between the E interface and the S interface, L23 is the distance between the S interface and the C interface, and D3 is the diameter of the C interface.

[0178] like Fig.16a As shown, in this example, when the slider 203 is in the first working position, the E interface and the S interface are completely located within the inner cavity of the slider 203, that is, at this time, the distance between the first cavity side wall 231 and the second cavity side wall 232 of the inner cavity of the slider 203 is at least equal to the sum of the radius of the E interface, the spacing between the E interface and the S interface, and the radius of the S interface. This arrangement can reduce the flow resistance of the refrigerant when flowing through the E interface and the S interface in this working position, and reduce the pressure loss.

[0179] Furthermore, in the first working position, the area covered by the slider 203 of the C interface is not larger than half of the flow area of ​​the C interface. As shown in the figure, in the radial direction of the C interface, the length L02 covered by the slider 203 of the C interface is not larger than the radius of the C interface (D3) / 2. In this way, the flow resistance of the refrigerant when flowing through the C interface in this working position can also be reduced, thereby reducing the pressure loss.

[0180] like Fig.16c As shown, in this example, when the slider 203 is in the third working position, the S interface and the C interface are completely located within the inner cavity of the slider 203, that is, at this time, the distance between the first cavity side wall 231 and the second cavity side wall 232 of the inner cavity of the slider 203 is at least equal to the sum of the radius of the S interface, the spacing between the S interface and the C interface, and the radius of the C interface. This arrangement can reduce the flow resistance of the refrigerant when flowing through the S interface and the C interface in this working position, and reduce the pressure loss.

[0181] Furthermore, in the third working position, the area covered by the slider 203 of the E interface is not greater than half of the flow area of ​​the E interface. As shown in the figure, in the radial direction of the E interface, the length L03 covered by the slider 203 of the E interface is not greater than (D1) / 2. In this way, the flow resistance of the refrigerant when flowing through the E interface in this working position can also be reduced, thereby reducing the pressure loss.

[0182] Specifically, for the convenience of setting, the structure of the slider 203 is set symmetrically. At the same time, the E interface, S interface and C interface are set with the same diameter, and the spacing between the E interface and the S interface is the same as the spacing between the S interface and the C interface, that is, D1=D3, L12=L23. It can be understood that after such setting, L02=L03.

[0183] like Fig.16b As shown, in this example, the slider 203 is in the second working position, and the area covered by the slider 203 on the C interface is larger than half of the flow area of ​​the C interface. That is, in the radial direction of the C interface, the length L01 covered by the slider 203 on the C interface is larger than (D3) / 2, and the area covered by the slider 203 on the E interface is also larger than half of the flow area of ​​the E interface.

[0184] It can be understood that in other examples, in order to reduce the flow resistance of the refrigerant in the second working position, the area covered by the slider 203 on the C interface can be at least not larger than half of the flow area of ​​the C interface, and / or the area covered by the slider 203 on the E interface can be at least not larger than half of the flow area of ​​the E interface.

[0185] Please refer to Fig.17a , Fig.17b and Fig.17c , Fig.17a , Fig.17b and Fig.17cThe schematic diagrams respectively show the structure of the slider in the first working position, the second working position and the third working position in the first embodiment of the valve seat and slider matching structure.

[0186] Similarly, in this example, the length L2 of the slider 203 satisfies:

[0187] L2>(D1) / 2+L12+L23+(D3) / 2;

[0188] Among them, D1 is the diameter of the E interface, L12 is the distance between the E interface and the S interface, L23 is the distance between the S interface and the C interface, and D3 is the diameter of the C interface.

[0189] For the convenience of setting, the structure of the slider 203 in this example is also symmetrically set, and D1 = D3, L12 = L23, and the diameter of the S interface is also set the same as that of the E interface and the C interface.

[0190] like Fig.17a As shown, in this example, when the slider 203 is in the first working position, the E interface and the S interface are completely located within the inner cavity of the slider 203. This arrangement can reduce the flow resistance of the refrigerant when it flows through the E interface and the S interface in this working position, thereby reducing the pressure loss.

[0191] like Fig.17b As shown, in this example, the slider 203 is in the second working position, and in the radial direction of the C interface, the length L01 of the slider 203 covering the C interface is less than the radius (D3) / 2 of the C interface, and the length of the slider 203 covering the E interface is also less than the radius of the E interface. This arrangement can reduce the flow resistance of the refrigerant in the second working position and reduce the pressure loss.

[0192] like Fig.17c As shown, in this example, when the slider 203 is in the third working position, the S interface and the C interface are completely located within the inner cavity of the slider 203. This arrangement can reduce the flow resistance of the refrigerant when it flows through the S interface and the C interface in this working position, thereby reducing the pressure loss.

[0193] In the illustrated scheme, in the first working position, in the radial direction of the C interface, the length L02 covered by the slider 203 of the C interface is greater than the radius of the C interface; in the third working position, in the radial direction of the E interface, the length L03 covered by the slider 203 of the E interface is greater than the radius of the E interface.

[0194] It can be understood that in other examples, it can be further configured that in the first working position, on the basis that the inner cavity of the slider 203 completely covers the E interface and the S interface, the area of ​​the C interface covered by the slider 203 is no more than half of the flow area of ​​the C interface, so as to reduce the flow resistance of the refrigerant flowing through the C interface in this working position; at the same time, in the third working position, on the basis that the inner cavity of the slider 203 completely covers the S interface and the C interface, the area of ​​the E interface covered by the slider 203 is no more than half of the flow area of ​​the E interface, so as to reduce the flow resistance of the refrigerant flowing through the E interface in this working position.

[0195] Please refer to Fig.18a , Fig.18b and Fig.18c , Fig.18a , Fig.18b and Fig.18c The schematic diagrams respectively show the structure of the slider in the first working position, the second working position and the third working position in the first embodiment of the valve seat and slider matching structure.

[0196] Similarly, in this example, the length L2 of the slider 203 satisfies:

[0197] L2>(D1) / 2+L12+L23+(D3) / 2;

[0198] Among them, D1 is the diameter of the E interface, L12 is the distance between the E interface and the S interface, L23 is the distance between the S interface and the C interface, and D3 is the diameter of the C interface.

[0199] For the convenience of setting, the structure of the slider 203 in this example is also symmetrically set, and D1 = D3, L12 = L23, and the diameter of the S interface is also set the same as that of the E interface and the C interface.

[0200] like Fig.18a As shown, in this example, when the slider 203 is in the first working position, the E interface and the S interface are completely located within the inner cavity of the slider 203. This arrangement can reduce the flow resistance of the refrigerant when it flows through the E interface and the S interface in this working position, thereby reducing the pressure loss.

[0201] At the same time, in the radial direction of the C interface, the length L02 of the slider 203 covering the C interface is less than the radius (D3) / 2 of the C interface. In this way, the flow resistance of the refrigerant when flowing through the C interface in this working position can also be reduced, thereby reducing the pressure loss.

[0202] like Fig.18b As shown, in this example, the slider 203 is in the second working position, and the E interface, the S interface and the C interface are all completely within the inner cavity of the slider 203. In this way, in the second working position, the flow resistance of the refrigerant is minimal.

[0203] On the basis of satisfying this condition, in order to make the size of the slider 203 smaller so that the connecting component 204 can drive it to slide, the distance L21 between the first cavity side wall 231 and the second cavity side wall 232 of the slider 203, that is, the length of the inner cavity of the slider 203 in the axial direction of the valve body component is equal to (D1) / 2+L12+L23+(D3) / 2.

[0204] like Fig.18c As shown, in this example, when the slider 203 is in the third working position, the S interface and the C interface are completely located within the inner cavity of the slider 203. This arrangement can reduce the flow resistance of the refrigerant when it flows through the S interface and the C interface in this working position, thereby reducing the pressure loss.

[0205] At the same time, in the radial direction of the E interface, the length L03 of the slider 203 covering the E interface is less than the radius (D1) / 2 of the E interface. In this way, the flow resistance of the refrigerant flowing through the C interface in this working position can also be reduced, thereby reducing the pressure loss.

[0206] Furthermore, in order to reduce the size of the valve seat 202 and simplify the structure, on the basis of satisfying the above conditions, as Fig.18a As shown, when the slider 203 is in the first working position, the axial distance between the side wall of the valve seat 202 close to the E interface and the first cavity side wall 231 of the inner cavity of the slider 203 is greater than zero. Fig.18c As shown, when the slider 203 is in the third working position, the axial distance between the side wall of the valve seat 202 close to the C interface and the second cavity side wall 232 of the inner cavity of the slider 203 is greater than zero.

[0207] Please refer to Fig.19 , Fig.19 This is a schematic structural diagram of another embodiment of the electromagnetic switching valve provided by the present invention.

[0208] Fig.19 The solenoid switching valve shown in Figures 5 to 7 The working principle and main structure of the solenoid switching valve shown are basically the same. The difference between the two is that in this embodiment, the setting position of the second pilot valve component 207 of the solenoid switching valve is different. Only this difference is described in detail below, and other structures can be understood by referring to the above description.

[0209] like Fig.19 As shown, in this embodiment, a connection port communicating with the main valve cavity Q4 is opened on the second valve body 212, the second pilot valve sleeve 271 of the second pilot valve component 207 is fixedly connected to the second valve body 212, and the second sleeve cavity of the second pilot valve sleeve 271 is directly communicated with the connection port. Figure 5-Figure 7 In this solution, the second set of chambers is directly connected to the main valve chamber Q4, and the second d2 capillary can be omitted.

[0210] In addition, in this example, the first valve body 211 is disposed on the right side of the second valve body 212. Figures 5 to 7 In the example shown, the first valve body 211 is disposed on the left side of the second valve body 212 , and can be disposed in practice according to actual needs.

[0211] The electromagnetic switching valve provided by the present invention and the refrigeration system having the same are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. Solenoid switching valve, characterized in that: The invention comprises a valve body component, wherein the valve body component is provided with a main valve cavity, and also is provided with a first cavity, a second cavity and a third cavity, each cavity is independently arranged, the second cavity is located at one end of the main valve cavity, the third cavity is located at the other end of the main valve cavity, the second cavity is closer to the main valve cavity than the first cavity, a slider and a valve seat are provided in the main valve cavity, the valve seat is provided with an E interface, an S interface and a C interface, the valve body component is also provided with a D interface, the valve body component also comprises a D pipe, an E pipe, an S pipe and a C pipe, the D pipe is fixedly connected to the D interface and communicates with the main valve cavity through the D interface, the E pipe is fixedly connected to the E interface, the S pipe is fixedly connected to the S interface, and the C pipe is fixedly connected to the C interface, the electromagnetic switching valve also comprises a first pilot valve component and a second pilot valve component, the first pilot valve component comprises a first d1 position capillary, the first d1 position capillary is connected to the D pipe, The first d1 position capillary is communicated with the main valve cavity through the D pipe, and also includes a first s1 position capillary, a first e1 position capillary and a first c1 position capillary, the first s1 position capillary is connected to the S pipe, the first s1 position capillary is communicated with the slider inner cavity of the slider through the S pipe, the first e1 position capillary is communicated with the second cavity, the first c1 position capillary is communicated with the third cavity, the second pilot valve component includes a second d2 position capillary, the second d2 position capillary is connected to the D pipe, the second d2 position capillary is communicated with the main valve cavity through the D pipe, and also includes a second s2 position capillary and a second e2 position capillary, the second s2 position capillary is connected to the S pipe, the second s2 position capillary is communicated with the slider inner cavity through the S pipe, the second e2 position capillary is communicated with the first cavity, the slider can be switched between three working positions, and is configured as follows: Located at the first working position, the first pilot valve component is in a power-off state, the second pilot valve component is in a power-on state, the first cavity and the second cavity form a low-pressure state, the third cavity forms a high-pressure state, the E interface and the S interface are in communication with the slider inner cavity, the C interface is not in communication with the slider inner cavity, the slider inner cavity has a first projection on the plane where the upper surface of the valve seat is located, the first projection covers at least a portion of the E interface, and the first projection covers at least a portion of the S interface; Located at the second working position, the first pilot valve component and the second pilot valve component are both in a power-off state, the first cavity forms a high-pressure state, the second cavity forms a low-pressure state, the third cavity forms a high-pressure state, the E interface, the S interface and the C interface are all connected to the inner cavity of the slider, the inner cavity of the slider has a second projection on the plane where the upper surface of the valve seat is located, the second projection completely covers the S interface, the second projection covers at least a portion of the E interface, and the second projection covers at least a portion of the C interface; Located in the third working position, the first pilot valve component is in an energized state, the second pilot valve component is in an off-power state, the first cavity and the second cavity form a high-pressure state, the third cavity forms a low-pressure state, the S interface and the C interface are connected to the slider inner cavity, the E interface is not connected to the slider inner cavity, the slider inner cavity has a third projection on the plane where the valve seat upper surface is located, the third projection covers at least part of the S interface, and the third projection covers at least part of the C interface.

2. The electromagnetic switching valve according to claim 1, characterized in that: The valve body component includes a first valve body and a second valve body, the first valve body and the second valve body are fixedly connected or are an integral structure, the diameter of the first valve body is larger than the diameter of the second valve body, the valve body component also includes a first end cover and a second end cover, the first end cover blocks one end of the first valve body and is fixedly connected to the first valve body or is an integral structure, the second end cover blocks one end of the second valve body, a connecting rod assembly is also provided in the main valve cavity, the connecting rod assembly includes a connecting rod, one end of the connecting rod is connected to the first piston component, the other end of the connecting rod is connected to the second piston component, the main valve cavity is formed between the first piston component and the second piston component, the valve body component also includes a sliding member and a stopper, the sliding member can slide to approach or move away from the valve seat, and the stopper is used to limit the sliding position of the sliding member.

3. The electromagnetic switching valve according to claim 2, characterized in that: The sliding member includes an isolating portion, a connecting rod and a limiting portion, the connecting rod is located between the isolating portion and the limiting portion, the isolating portion is fixedly connected or limit-connected to one end of the connecting rod, the limiting portion is fixedly connected or limit-connected to the other end of the connecting rod, the limiting portion is closer to the valve seat than the isolating portion, the stop portion is fixedly connected to the first valve body and / or the second valve body, or the stop portion and the first valve body are an integral structure, or the stop portion and the second valve body are an integral structure, a portion of the first valve body, the first end cover and the isolating portion roughly define the first cavity, another portion of the first valve body, the isolating portion and the first piston component roughly define the second cavity, and the second valve body, the second piston component and the second end cover roughly define the third cavity.

4. The electromagnetic switching valve according to claim 3, characterized in that: When the electromagnetic switching valve is in the first working position, the inner cavity of the slider is connected to the E interface and the S interface, the isolation portion abuts against the first end cover, and the limiting portion abuts against the first piston component; When the electromagnetic switching valve is in the second working position, the inner cavity of the slider is connected with the E interface, the S interface and the C interface, the isolation part is relatively far away from the first end cover and the isolation part abuts against the stopper, and the limiting part abuts against the first piston component; When the electromagnetic switching valve is in the third working position, the inner cavity of the slider is connected to the S interface and the C interface, the isolation part is relatively far away from the first end cover and the isolation part is against the stop part, and the limiting part is relatively far away from the first piston component.

5. The electromagnetic switching valve according to claim 3, characterized in that: The limiting portion is located in the second cavity, the second cavity includes a first sub-cavity and a second sub-cavity, the limiting portion is also provided with a circulation channel, the limiting portion is provided with a circulation hole, the circulation hole forms the circulation channel, or the gap between the limiting portion and the cavity wall of the second valve body roughly forms the circulation channel, the first sub-cavity and the second sub-cavity are connected through the circulation portion.

6. The electromagnetic switching valve according to any one of claims 2 to 5, characterized in that: The first valve body has a large-diameter cavity, the second valve body has a small-diameter cavity, and the radius of the large-diameter cavity and the radius of the small-diameter cavity meet the following conditions: π(R1 2 -R2 2 )ΔP>F f +F f ’; Wherein, R1 is the radius of the large diameter cavity, R2 is the radius of the small diameter cavity, ΔP is the minimum operating pressure difference of the system, and F f is the friction force of the connecting rod assembly, F f ' is the friction force of the sliding member.

7. The electromagnetic switching valve according to any one of claims 1 to 5, characterized in that: The first pilot valve component includes a first driving portion, a first pilot valve sleeve, a first pilot valve seat and a first pilot valve bowl; The first pilot valve seat is located in the first sleeve cavity of the first pilot valve sleeve, the first pilot valve seat has a first connection port, a second connection port and a third connection port, the second connection port is located between the first connection port and the third connection port, the first e1 position capillary is fixedly connected to the first connection port, the first s1 position capillary is fixedly connected to the second connection port, and the first c1 position capillary is fixedly connected to the third connection port; The first pilot valve bowl abuts against the first pilot valve seat, and the first pilot valve bowl can slide along the first pilot valve seat through the driving of the first driving unit to switch between two working positions, and is configured as follows: Located at the first working position, the first connecting port and the second connecting port are in communication with the inner cavity of the first pilot valve bowl, and the third connecting port is in communication with the first sleeve cavity; Located at the second workstation, the first connection port is communicated with the first sleeve cavity, and the second connection port and the third connection port are communicated with the inner cavity of the first pilot valve bowl; The first sleeve cavity is communicated with the D-type pipe.

8. The electromagnetic switching valve according to any one of claims 1 to 5, characterized in that: The second pilot valve component includes a second driving portion, a second pilot valve sleeve, a second pilot valve seat and a second pilot valve bowl; The second pilot valve seat is located in the second sleeve cavity of the second pilot valve sleeve, the second pilot valve seat has a first interface and a second interface, the second e2 position capillary is fixedly connected to the first interface, and the second s2 position capillary is fixedly connected to the second interface; The second pilot valve bowl abuts against the second pilot valve seat, and the second pilot valve bowl can slide along the second pilot valve seat through the drive of the second drive unit, so that the inner cavity of the second pilot valve bowl communicates with the first interface and the second interface, or the first interface communicates with the second sleeve cavity, and the second interface communicates with the inner cavity of the second pilot valve bowl; The second sleeve cavity is communicated with the D-type pipe.

9. The electromagnetic switching valve according to claim 8, characterized in that: The second driving part includes a second coil, a second static iron core, a second moving iron core, a second resetting elastic member and a second connecting frame, wherein the second resetting elastic member is arranged between the second static iron core and the second moving iron core, and the second moving iron core is connected to the second pilot valve bowl through the second connecting frame, and is configured as follows: When the second coil is powered on, the second moving iron core is attracted to the second static iron core, and the inner cavity of the second pilot valve bowl is connected to the first interface and the second interface; When the second coil is powered off, the second moving iron core is disengaged from the second static iron core under the action of the second reset elastic member, the first interface is connected to the second sleeve cavity, and the second interface is connected to the inner cavity of the second pilot valve bowl.

10. Solenoid switching valve, characterized in that: The invention comprises a valve body component, wherein the valve body component is provided with a main valve cavity, and further comprises a first cavity, a second cavity and a third cavity, wherein each cavity is independently arranged, the second cavity is located at one end of the main valve cavity, the third cavity is located at the other end of the main valve cavity, the second cavity is closer to the main valve cavity than the first cavity, a slider and a valve seat are arranged in the main valve cavity, the valve seat is provided with an E interface, an S interface and a C interface, the valve body component is further provided with a D interface, the valve body component further comprises a D pipe, an E pipe, an S pipe and a C pipe, the D pipe is fixedly connected to the D interface and communicated with the main valve cavity through the D interface, the E pipe is fixedly connected to the E interface, the S pipe is fixedly connected to the S interface, and the C pipe is fixedly connected to the C interface, the electromagnetic switching valve further comprises a first pilot valve component and a second pilot valve component, the first pilot valve component comprises a first d1-position capillary, the first d1-position capillary is connected to the D pipe, the first d1-position capillary is communicated with the main valve cavity through the D pipe, and further comprises a first s1-position capillary The invention relates to a capillary tube, a first e1 capillary tube and a first c1 capillary tube, wherein the first s1 capillary tube is connected to the S pipe tube, the first s1 capillary tube is communicated with the slider inner cavity of the slider through the S pipe tube, the first e1 capillary tube is communicated with the third cavity, the first c1 capillary tube is communicated with the second cavity, the second pilot valve component comprises a second d2 capillary tube, the second d2 capillary tube is connected to the D pipe tube, the second d2 capillary tube is communicated with the main valve cavity through the D pipe tube, or the valve body component comprises a second valve body, the second pilot valve component has a second pilot valve sleeve, the second pilot valve sleeve is fixedly connected to the second valve body, the second sleeve cavity of the second pilot valve sleeve is communicated with the main valve cavity, and also comprises a second s2 capillary tube and a second e2 capillary tube, the second s2 capillary tube is connected to the S pipe tube, the second s2 capillary tube is communicated with the slider inner cavity through the S pipe tube, the second e2 capillary tube is communicated with the first cavity, the slider can be switched between three working positions and is configured as follows: Located at the first working position, the first pilot valve component is in a power-off state, the second pilot valve component is in a power-on state, the first cavity and the second cavity form a high-pressure state, the third cavity forms a low-pressure state, the E interface and the S interface are in communication with the slider inner cavity, the C interface is not in communication with the slider inner cavity, the slider inner cavity has a first projection on the plane where the upper surface of the valve seat is located, the first projection covers at least a portion of the E interface, and the first projection covers at least a portion of the S interface; Located at the second working position, the first pilot valve component and the second pilot valve component are both in an energized state, the first cavity forms a high-pressure state, the second cavity forms a low-pressure state, the third cavity forms a high-pressure state, the E interface, the S interface and the C interface are all connected to the inner cavity of the slider, the inner cavity of the slider has a second projection on the plane where the upper surface of the valve seat is located, the second projection completely covers the S interface, the second projection covers at least a portion of the E interface, and the second projection covers at least a portion of the C interface; Located in the third working position, the first pilot valve component is in an energized state, the second pilot valve component is in an off-power state, the first cavity and the second cavity form a low-pressure state, the third cavity forms a high-pressure state, the S interface and the C interface are connected to the slider cavity, the E interface is not connected to the slider cavity, the slider cavity has a third projection on the plane where the valve seat upper surface is located, the third projection covers at least part of the S interface, and the third projection covers at least part of the C interface.

11. A refrigeration system, comprising a compressor, an indoor heat exchanger, and a four-way valve, wherein the inlet of the compressor is connected to the S port of the four-way valve; characterized in that: It also includes an electromagnetic switching valve, a first outdoor heat exchanger and a second outdoor heat exchanger, wherein the electromagnetic switching valve is the electromagnetic switching valve according to any one of claims 1 to 9; The outlet pipeline of the compressor is divided into two branches, the first branch is connected to the D port of the four-way valve, and the second branch is connected to the D interface of the electromagnetic switching valve; The C port of the four-way valve is connected to an interface of the indoor heat exchanger, and the E port is connected to the S interface of the electromagnetic switching valve; The E interface and the C interface of the electromagnetic switching valve are respectively connected to an interface of the first outdoor heat exchanger and an interface of the second outdoor heat exchanger; Another interface of the first outdoor heat exchanger and another interface of the second outdoor heat exchanger are connected to another interface of the indoor heat exchanger through a pipeline; The second branch is also provided with a flow regulating valve.

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