Electromagnetic switching valve and refrigeration system having the same

Abstract

The present invention discloses an electromagnetic switching valve and a refrigeration system having the same. The electromagnetic switching valve includes a valve body member having a valve cavity, a valve seat, a slider and a connecting rod assembly; it also includes first and second pilot valve members and a sliding member. Under the control of the first and second pilot valve members, the sliding direction of the sliding member and the connecting rod assembly can be switched, so that the slider can be switched between three working positions: when located at the first working position, the E port and the S port are connected through the inner cavity of the slider, and the C port is not connected to the inner cavity of the slider; when located at the second working position, the E, S, and C ports are all connected to the inner cavity of the slider; when located at the third working position, the S port and the C port are connected through the inner cavity of the slider, and the E port is not connected to the inner cavity of the slider. This electromagnetic switching valve has three working positions and is applied to a refrigeration system. It can perform the defrosting operation on the outdoor unit without changing the operating conditions of the indoor and outdoor heat exchangers, reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, and particularly 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 applied to an air-conditioning refrigeration system, when the air conditioner is in a refrigeration cycle, the D connection of the four-way valve is communicated with the C connection, and the E connection is communicated with the S connection. 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 the heat of the indoor environment to achieve indoor refrigeration; when the air conditioner is in a heating cycle, the D connection is communicated with the E connection, and the C connection is communicated with the S connection. 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 refrigeration.

[0003] In practical applications, when the air-conditioning refrigeration system is in a heating cycle for a long time, the outdoor heat exchanger will frost. To ensure the normal operation of the air-conditioning system, it is necessary to defrost the outdoor heat exchanger.

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

[0005] The present invention provides an electromagnetic switching valve, including a valve body component, a first pilot valve component, and a second pilot valve component;

[0006] The valve body component includes a first valve body and a second valve body, and 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;

[0007] It further includes a first end cover, a sliding member, and a stop portion. The first end cover plugs the opening of the first valve body; the sliding member includes an isolation portion and a limiting portion;

[0008] The second valve body is provided with a valve seat, a slider, and a connecting rod assembly. The valve seat is provided with an E interface, an S interface, and a C interface. The second valve body is provided with a D interface. The slider has a slider inner cavity; the connecting rod assembly includes a connecting rod and a first piston component and a second piston component fixedly provided at both ends of the connecting rod;

[0009] The valve body component has a valve cavity, and the sliding member can slide in the valve cavity to approach or move away from the valve seat. The stop portion is used to limit the sliding position of the sliding member;

[0010] The valve cavity includes a main valve cavity formed between the first piston component and the second piston component. The main valve cavity is connected to the D interface. The valve cavity further includes a first cavity, a second cavity, and a third cavity. The first pilot valve component and the second pilot valve component can change the pressure difference between the first cavity and the second cavity, and the pressure difference between the second cavity and the third cavity, so as to switch the sliding direction of the slider and the sliding direction of the sliding member, enabling the electromagnetic switching valve to have three working positions:

[0011] The first working position: The inner cavity of the slider is connected to the E interface and the S interface. The isolation part abuts against the first end cover, and the limiting part abuts against the first piston.

[0012] The second working position: The inner cavity of the slider is connected to the E interface, the S interface, and the C interface. The isolation part is relatively far away from the first end cover and abuts against the stop part, and the limiting part abuts against the first piston component.

[0013] 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 abuts against the stop part, and the limiting part is relatively far away from the first piston component.

[0014] The present invention further provides a refrigeration system, including a compressor, an indoor heat exchanger, and a four-way valve. The inlet of the compressor is connected to the S port of the four-way valve. It further includes an electromagnetic switching valve, a first outdoor heat exchanger, and a second outdoor heat exchanger. The electromagnetic switching valve is the electromagnetic switching valve described above.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] The other interfaces of the first outdoor heat exchanger and the second outdoor heat exchanger are connected to the other interface of the indoor heat exchanger through a pipeline.

[0019] A flow regulating valve is further provided on the second branch.

[0020] The present invention provides an electromagnetic switching valve and a refrigeration system. Through the optimized design of the structure of the electromagnetic switching valve, it has three working positions, and can achieve the defrosting operation of the outdoor unit without changing the heating state of the indoor unit, relatively reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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;

[0022] 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;

[0023] Figure 3 It is a schematic diagram of the principle of the refrigeration system in the first defrosting mode in the specific embodiment provided by the present invention;

[0024] Figure 4 It is a schematic diagram of the principle of the refrigeration system in the second defrosting mode in the specific embodiment provided by the present invention;

[0025] Figures 5 to 7 They are respectively schematic diagrams of the structure of the electromagnetic switching valve in the first working mode, the second working mode and the third working mode in the specific embodiment;

[0026] Figure 8a and Figure 8b They are respectively partial schematic diagrams of the first pilot valve component of the electromagnetic switching valve in the powered-on state and the powered-off state in the specific embodiment;

[0027] Figure 9a and Figure 9b They are respectively partial schematic diagrams of the second pilot valve component of the electromagnetic switching valve in the powered-on state and the powered-off state in the specific embodiment;

[0028] Figure 10 and Figure 11 It shows a partial schematic diagram of the first embodiment of the mating structure of the valve body component and the sliding member, wherein, Figure 10 the sliding member is in the first position, Figure 11 the sliding member is in the second position;

[0029] Figure 12 and Figure 13 It shows a partial schematic diagram of the second embodiment of the mating structure of the valve body component and the sliding member, wherein, Figure 12 the sliding member is in the first position, Figure 13 the sliding member is in the second position;

[0030] Figure 14 and Figure 15 It shows a partial schematic diagram of the third embodiment of the mating structure of the valve body component and the sliding member, wherein,Figure 14 In the middle, the sliding member is in the first position, Figure 15 in the middle, the sliding member is in the second position;

[0031] Figure 16a , Figure 16b and Figure 16c respectively show the structural schematic diagrams of the slider in the first working position, the second working position, and the third working position in the first embodiment of the cooperation structure between the valve seat and the slider;

[0032] Figure 17a , Figure 17b and Figure 17c respectively show the structural schematic diagrams of the slider in the first working position, the second working position, and the third working position in the first embodiment of the cooperation structure between the valve seat and the slider;

[0033] Figure 18a , Figure 18b and Figure 18c respectively show the structural schematic diagrams of the slider in the first working position, the second working position, and the third working position in the first embodiment of the cooperation structure between the valve seat and the slider;

[0034] Figure 19 is a structural schematic diagram of another embodiment of the electromagnetic switching valve provided by the present invention;

[0035] Figures 20a to 20d shows four cooperation relationships between the slider and the valve seat when the electromagnetic switching valve is in the first working position;

[0036] Figures 21a to 21d shows four cooperation relationships between the slider and the valve seat when the electromagnetic switching valve is in the second working position;

[0037] Figures 22a to 22d shows four cooperation relationships between the slider and the valve seat when the electromagnetic switching valve is in the third working position.

[0038] Explanation of reference numerals:

[0039] 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;

[0040] First cavity Q1, second cavity Q2, third cavity Q3, main valve cavity Q4;

[0041] First valve body 211, body part 2111, connecting part 2112, second valve body 212, first end cover 213, second end cover 214, adapter seat 215, first step part 2151, second step part 2152, axial protrusion 2153;

[0042] Valve seat 202;

[0043] Slider 203, inner cavity of the slider 203a, side wall of the first cavity 231, side wall of the second cavity 232;

[0044] Linkage assembly 204, link 241, first piston component 242, second piston component 243;

[0045] Sliding member 205, isolation portion 251, piston bowl 2511, isolation block 2512, sealing ring 2513, limiting portion 252, connecting rod 253;

[0046] First pilot valve component 206, first pilot valve sleeve 261, first pilot valve seat 262, first pilot valve bowl 263, first coil 264, first stationary iron core 265, first moving iron core 266, first reset elastic member 267, first connecting bracket 268;

[0047] Second pilot valve component 207, second pilot valve sleeve 271, second pilot valve seat 272, first interface 272a, second interface 272b, second pilot valve bowl 273, second coil 274, second stationary iron core 275, second moving iron core 276, second reset elastic member 277, second connecting bracket 278. Detailed implementation manners

[0048] To enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0049] For the convenience of understanding and concise description, the following will be described in conjunction with the electromagnetic switching valve and the refrigeration system having the same. The beneficial effects will not be repeated.

[0050] Please refer to Figures 1 to 4 , Figure 1 which 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 which 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 which is a schematic diagram of the principle of the refrigeration system in the first defrosting mode in the specific embodiment provided by the present invention; Figure 4 which is a schematic diagram of the principle of the refrigeration system in the second defrosting mode in the specific embodiment provided by the present invention.

[0051] 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.

[0052] Among them, the four-way valve 104 has the structure of a currently common four-way valve and only has 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.

[0053] The electromagnetic switching valve 105 is an electromagnetic switching valve improved by the present invention based on the existing four-way valve and has three working positions, which will be specifically described in the working mode of the refrigeration system below.

[0054] Among them, the inlet of the compressor 101 is connected to the S port of the four-way valve 104. 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 be an expansion valve to adjust the refrigerant flow rate on each branch and ensure the normal operation of the refrigeration system.

[0055] 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 interface of the electromagnetic switching valve 105.

[0056] The E interface of the electromagnetic switching valve 105 is connected to an interface of the first outdoor heat exchanger 131, and the C interface of the electromagnetic switching valve 105 is connected to an interface of the second outdoor heat exchanger 132.

[0057] 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 this pipeline.

[0058] With the above settings, the working modes of the refrigeration system include a refrigeration mode, a heating mode, and a defrosting mode. There are two situations in the defrosting mode, which will be described one by one below.

[0059] Refrigeration mode

[0060] As Figure 1 shown, in the refrigeration 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 interface, the S interface, and the C interface are interconnected.

[0061] Since the D port 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 degree; the high-temperature and high-pressure refrigerant at the outlet end of the compressor 101 mainly flows through the first branch to the D port of the four-way valve 104, and then through the E port of the four-way valve 104 to the S port of the electromagnetic switching valve 105. Since the S port of the electromagnetic switching valve 105 is connected to both its E port and C port, the refrigerant flowing into the S port is divided into two paths and flows into the first outdoor heat exchanger 131 and the second outdoor heat exchanger 132 through the E port and C port respectively. At this time, both outdoor heat exchangers are in the heating state. After passing through the outdoor heat exchanger, the refrigerant becomes 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 the cooling state, and finally returns to the compressor 101 through the four-way valve 104.

[0062] Heating mode

[0063] As Figure 2 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, S port and C port are interconnected.

[0064] Since the D port of the electromagnetic switching valve 105 is in a closed state, in actual application, the flow regulating valve 106 can be closed. Of course, the flow regulating valve 106 can also be adjusted to a smaller opening degree; the high-temperature and high-pressure refrigerant at the outlet end of the compressor 101 mainly flows through the first branch to the D port of the four-way valve 104, and then through the C port of the four-way valve 104 to the indoor heat exchanger 102. At this time, the indoor heat exchanger 103 is in the heating state. 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 the cooling state. The refrigerant flowing out of the two outdoor heat exchangers flows to the E port and C port of the electromagnetic switching valve 105 respectively, and then flows to the four-way valve 104 through the S port of the electromagnetic switching valve 105, and finally returns to the compressor 101.

[0065] First defrost mode

[0066] As Figure 3 shown, in the first defrosting 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 is connected to the S port and the D port is connected to the C port.

[0067] The opening degree of the flow regulating valve 106 can be adjusted according to the defrosting requirements, and at the same time, the heating effect of the indoor heat exchanger 102 should also be ensured.

[0068] The high-temperature and high-pressure refrigerant at the outlet end of the compressor 101 is divided into two branches. A part of the refrigerant flows through the flow regulating valve 106 and then enters the second outdoor heat exchanger 132 through the passage from the D port to the C port of the electromagnetic switching valve 105. At this time, the second outdoor heat exchanger 132 is in the defrosting state. Due to the pressure difference, the refrigerant flowing out of the second outdoor heat exchanger 132 will flow to the first outdoor heat exchanger 131 and return to the compressor 101 through the passage from the E port to the S port of the electromagnetic switching valve 105 and the passage from the E port to the S port of the four-way valve 104. Another part of the refrigerant at the outlet end of the compressor 101 flows through the passage from the D port to the C port of the four-way valve 104 to the indoor heat exchanger 102. The indoor heat exchanger 102 is in the 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, flows through the first outdoor heat exchanger 131, and the first outdoor heat exchanger 131 is in the refrigeration 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.

[0069] Second defrost mode

[0070] As Figure 4 shown, in the second defrosting 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 D port is connected to the E port and the C port is connected to the S port.

[0071] The flow regulating valve 106 can adjust its opening according to the defrosting requirement, and at the same time, it should also ensure the heating effect of the indoor heat exchanger 102.

[0072] The high-temperature and high-pressure refrigerant at the outlet end of the compressor 101 is divided into two branches. A part of the refrigerant flows through the flow regulating valve 106 and then enters the first outdoor heat exchanger 131 through the passage from the D port to the E port of the electromagnetic switching valve 105. At this time, the first outdoor heat exchanger 131 is in the defrosting state. Due to the pressure difference, the refrigerant flowing out of the first outdoor heat exchanger 131 will flow to the second outdoor heat exchanger 132 and return to the compressor 101 through the passage from the C port to the S port of the electromagnetic switching valve 105 and the passage from the E port to the S port of the four-way valve 104. Another part of the refrigerant at the outlet end of the compressor 101 flows through the passage from the D port to the C port of the four-way valve to the indoor heat exchanger 102. The indoor heat exchanger 102 is in the 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, flows through the second outdoor heat exchanger 132, and the second outdoor heat exchanger 132 is in the refrigeration 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.

[0073] As can be seen 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 and a conventional four-way valve 104, the refrigeration system can have a conventional refrigeration mode and a heating mode, and can defrost the outdoor heat exchanger without affecting the heating of the indoor heat exchanger 102.

[0074] As can be known from the working modes of the above refrigeration system, the electromagnetic switching valve 105 provided by the present invention can switch between three working positions. Specifically, its slider can switch between three working positions relative to the valve seat:

[0075] When the slider is 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 this first working position is the working position where the electromagnetic switching valve 105 is located in the first defrosting mode of the above refrigeration system;

[0076] When the slider is in the second working position, the E interface, the S interface and the C interface of the valve seat are all connected to the inner cavity of the slider, that is, the E interface, the S interface and the C interface are connected to each other; it can be understood that this second working position is the working position where the electromagnetic switching valve 105 is located in the refrigeration mode and the heating mode of the above refrigeration system;

[0077] When the slider is 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 this third working position is the working position where the electromagnetic switching valve 105 is located in the second defrosting mode of the above refrigeration system.

[0078] The following will make a detailed description of the specific structure of the electromagnetic switching valve provided by the present invention in conjunction with the drawings.

[0079] Please refer to Figures 5 to 7 , Figures 5 to 7 which are respectively the schematic structural diagrams of the electromagnetic switching valve in the first working mode, the second working mode and the third working mode in the specific embodiment.

[0080] In this embodiment, the electromagnetic switching valve includes a main valve and a pilot valve.

[0081] The main valve of the electromagnetic switching valve includes a valve body component with a valve cavity, a valve seat 202, a slider 203 and a connecting rod assembly 204.

[0082] The valve body component has a D interface communicating with 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 first piston components 242 and second piston components 243 fixedly arranged 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 tightly 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.

[0083] In this embodiment, the main valve further includes a sliding member 205, and the sliding member 205 includes an isolation portion 251.

[0084] 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 portion 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.

[0085] The pilot valve of the electromagnetic switching valve specifically includes a first pilot valve component 206 and a second pilot valve component 207, and the two 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.

[0086] Obviously, the two piston components of the connecting rod assembly 204 are respectively in sliding and sealing cooperation with the valve cavity. In this embodiment, the isolation portion 251 of the sliding member 205 is in sliding and sealing cooperation with the valve cavity. Only in this way can the two be made to 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 portion 251.

[0087] Specifically, when arranged, the first piston component 242 of the connecting rod assembly 204 is relatively close to the sliding member 205, and the second piston component 243 is relatively far from the sliding member 205.

[0088] It can be understood that after the above arrangement, the valve cavity of the valve body component is divided into four mutually sealed cavities, that is, a first cavity Q1 formed between the isolation portion 251 of the sliding member 205 and one end wall of the valve body component, a second cavity Q2 formed between the isolation portion 251 and the second piston component 242, a third cavity Q3 formed between the first piston component 241 and the other end wall of the valve body component, and a main valve cavity Q4 formed between the first piston component 241 and the second piston component 242.

[0089] That is, the first pilot valve component 206 and the second pilot valve component 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, so as to switch the sliding direction of the slider 203 and the sliding direction of the sliding member 205.

[0090] Specifically, the D interface of the valve body component is connected to the main valve cavity 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 cavity Q4 is always connected to high pressure.

[0091] Specifically, the first pilot valve component 206 changes the pressure difference between the two ends of the link assembly 204, that is, the pressure difference between the second cavity Q2 and the third cavity Q3, and the second pilot valve component 207 changes the pressure of the first cavity Q1. Combining the change in the pressure of the second cavity Q2 by the first pilot valve component 206, the pressure difference between the first cavity Q1 and the second cavity Q2 is controlled.

[0092] Please refer to Figure 8a and Figure 8b , Figure 8a and Figure 8b which are respectively partial schematic diagrams of the first pilot valve component of the electromagnetic switching valve in the energized state and the de-energized state in the specific embodiment.

[0093] 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.

[0094] The first pilot valve bowl 263 is tightly pressed against the first pilot valve seat 262. Under the drive of the first driving part, 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:

[0095] When located in the first working position, 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;

[0096] When located in the second working position, the first connection port is connected to the first sleeve cavity, and the second connection port is connected to the third connection port through the inner cavity of the first pilot valve bowl 263.

[0097] Among them, the first connection port (the connection port on the left side in the figure) is connected to the second cavity Q2 of the main valve through the capillary e1, the second connection port (the connection port in the middle in the figure) is connected to the S interface of the main valve through the capillary s1, the third connection port (the connection port on the right side in the figure) is connected to the third cavity Q3 of the main valve through the capillary c1, and the first sleeve cavity is connected to the D interface of the main valve through the capillary d1.

[0098] In a specific solution, 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 energizing and de-energizing 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 act, so as to drive the first guide valve bowl 263 to slide, thereby controlling the communication state between each interface, and further controlling the pressures of the second cavity Q2 and the third cavity Q3 of the main valve.

[0099] In the illustrated solution, when the first guide valve component 206 is in the power-off state, it is located at the first working position. At this time, the second cavity Q2 of the main valve is connected to the S interface through the capillary e1, the first connection port, the second connection port, and the capillary s1, 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 capillary c1, the third connection port, the first sleeve cavity, and the capillary d1, and the third cavity Q3 is in a high-pressure state.

[0100] When the first guide valve component 206 is in the power-on state, it is located at the second working position. At this time, the second cavity Q2 of the main valve is connected to the D interface through the capillary e1, the first connection port, the first sleeve cavity, and the capillary d1, 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 capillary c1, the third connection port, the second connection port, and the capillary s1, and the third cavity Q3 is in a low-pressure state.

[0101] Please also refer to Figure 9a and Figure 9b , Figure 9a and Figure 9b which are respectively partial schematic diagrams of the second guide valve component of the electromagnetic switching valve in the power-on state and the power-off state in the specific embodiment.

[0102] In this embodiment, the second guide valve component 207 includes a second driving part, a second guide valve sleeve 271 with a second sleeve cavity, a second guide valve seat 272 and a second guide valve bowl 273; the second guide valve seat 272 and the second guide valve bowl 273 are located in the second sleeve cavity, and the second guide valve seat 272 has a first interface and a second interface.

[0103] The second guide valve bowl 273 is tightly pressed and fitted with the second guide valve seat 272. Under the drive of the second driving part, the second guide valve bowl 273 can slide along the second guide valve seat 272 to switch between two states, and is configured as:

[0104] When in the first state, the first interface and the second interface are connected through the inner cavity of the second guide valve bowl 273;

[0105] In the second state, the first interface is connected to the second set of cavities, and the second interface is connected to the inner cavity of the second pilot valve bowl 273.

[0106] 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 capillary e2, the second interface (the interface on the right side in the figure) is connected to the S interface of the main valve through the capillary s2, and the second set of cavities is connected to the D interface of the main valve through the capillary d2.

[0107] In a specific solution, 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; among them, 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 pilot valve bowl 273. In this way, by energizing and de-energizing the second coil 274, combined with the second reset elastic member 277, the second moving iron core 276 is controlled to drive the second connecting frame 278 to act, so as to drive the second pilot valve bowl 273 to slide, thereby controlling the connection state between the interfaces, and further controlling the pressure state in the first cavity Q1 of the main valve.

[0108] As Figure 9a shown, when the second coil 274 of the second pilot valve component 207 (marked in Figure 5 ) is in the energized state, the second moving iron core 276 is attracted to the second static iron core 275, driving the second pilot valve bowl 273 to slide in the direction close to the second static iron core 275. 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. 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 capillary s2, and the first cavity Q1 is in a low-pressure state.

[0109] As Figure 9b shown, when the second coil 274 of the second pilot valve component 207 is in the de-energized 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 to the first set of cavities, the second interface is connected to 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 to the D interface through the first interface, the second set of cavities, and the capillary d2, and the first cavity Q1 is in a high-pressure state.

[0110] The electromagnetic switching valve further includes a stop portion for restricting 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. Meanwhile, in combination with the pressure difference between the second cavity Q2 and the third cavity Q3, the slider 203 can be switched between the aforementioned three working positions.

[0111] As Figure 5 shown, the first pilot valve component 206 is in a power-off state, and the second pilot valve component 207 is in a power-on state. That is to say, the first cavity Q1 is in a low-pressure state, the second cavity Q2 is in a low-pressure state, and the third cavity Q3 is in a high-pressure state. In this way, the connecting rod assembly 204 drives the slider 203 to move to the left (in the illustrated orientation), and also pushes the sliding member 205 to move to the left 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 and the S interface are connected 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 defrosting mode in the aforementioned refrigeration system.

[0112] As Figure 6 shown, both the first pilot valve component 206 and the second pilot valve component 207 are in a power-off state. That is to say, the first cavity Q1 is in a high-pressure state, the second cavity Q2 is in a low-pressure state, and the third cavity Q3 is in a high-pressure state. In this way, the sliding member 205 moves to the right under the pressure difference at both ends thereof to the second position where it abuts against the stop portion. The connecting rod assembly 204 drives the slider 203 to move to the left until it abuts against the sliding member 205, so that the slider 203 is in the aforementioned second working position. The E interface, the S interface, and the C interface are connected to each other through the inner cavity of the slider 203, and the D interface is not connected to the E interface, the S interface, and the C interface, that is, the working positions of the electromagnetic switching valve in the refrigeration mode and the heating mode in the aforementioned refrigeration system.

[0113] As Figure 7 shown, the first pilot valve component 206 is in a power-on state, and the second pilot valve component 207 is in a power-off state. That is to say, 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 where it abuts against the stop portion. The connecting rod assembly 204 drives the slider 203 to move to the right until it abuts 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 and the C interface are connected 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 electromagnetic switching valve in the second defrosting mode in the aforementioned refrigeration system.

[0114] It can be understood that during specific setting, the structures of the stop portion, the sliding member 205, and the link assembly 204 should be coordinated such that the three can cooperate to achieve corresponding functions in the states of the foregoing respective working positions.

[0115] During actual setting, since there are frictional resistances between the link assembly 204 and the valve body component when the link assembly 204 drives the slider 203 to slide and when the sliding member 205 slides, therefore, to ensure that the link assembly 204 and the sliding member 205 can move as introduced 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. 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 during system operation, the frictional force F of the link assembly 204 f , the frictional force F of the sliding member 205 f ’.

[0116] When the electromagnetic switching valve is in the second working position, both the first pilot valve component 206 and the second pilot valve component 207 are in the power-off state. The sliding member 205 is in the second position, and the link assembly 204 abuts against the sliding member 205; when switching from the second working position to the first working position, the first pilot valve component 206 does not act, 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. It should satisfy πR2 2 ΔP>F f +F f ' to ensure reliable commutation.

[0117] When the electromagnetic switching valve switches from the first working position to the second working position, the first pilot valve component 206 does not act, the second pilot valve component 207 changes from power-on to power-off, and the pressure of the first cavity Q1 changes from low pressure to high pressure. It should satisfy π(R1 2 -R2 2 )ΔP>F f +F f ' to ensure reliable commutation.

[0118] When the electromagnetic switching valve switches from the second working position to the third working position, the first pilot valve component 206 changes from power-off to power-on, the second pilot valve component 207 does not act, 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. It should satisfy πR2 2 ΔP>F f to ensure reliable commutation.

[0119] When the electromagnetic switching valve switches from the third working position to the second working position, the first pilot valve component 206 changes from power-on to power-off, the second pilot valve component 207 does not act, 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. It should satisfy πR2 2 ΔP>Ff To ensure reliable commutation.

[0120] When the electromagnetic switching valve switches from the first working position to the third working position, the second pilot valve component 207 first changes from being energized to de-energized, and the pressure in the first cavity Q1 changes from low pressure to high pressure. It should satisfy π(R1 2 -R2 2 )ΔP>F f +F f ', switches to the second working position, and then the first pilot valve component 206 changes from being de-energized to energized. The pressure in the second cavity Q2 changes from low pressure to high pressure, and the pressure in the third cavity Q3 changes from high pressure to low pressure. It should satisfy πR2 2 ΔP>F f To ensure reliable commutation.

[0121] When the electromagnetic switching valve switches from the third working position to the first working position, the first pilot valve component 206 first changes from being energized to de-energized. The pressure in the second cavity Q2 changes from high pressure to low pressure, and the pressure in the third cavity Q3 changes from low pressure to high pressure. It should satisfy πR2 2 ΔP>F f , switches to the second working position, and then the second pilot valve component 207 changes from being de-energized to energized. The pressure in the first cavity Q1 changes from high pressure to low pressure. It should satisfy πR2 2 ΔP>F f +F f ' to commutate reliably.

[0122] As can be seen from the above, in order to ensure reliable commutation, the radius of the valve cavity where the isolation part 251 of the sliding part 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. At the same time, it should also satisfy π(R1 2 -R2 2 )ΔP>F f +F f '.

[0123] It can be understood that the minimum operating pressure difference ΔP during system operation is determined according to the system requirements of actual applications. The relevant frictional force is related to the materials of relevant components and can be determined according to actual applications.

[0124] 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. Among them, both the first valve body 211 and the second valve body 212 are in a cylindrical structure. The adjacent ends of the two are fixedly connected, and their inner cavities are connected. The first end cover 213 seals the opening of the first valve body 211, and the second end cover 214 seals 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 through-diameter of the first valve body 211 is larger than that of the second valve body 212. It can be understood that after such a setting, the first end cover 213 is one 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, a first cavity Q1 is formed between the first end cover 213 and the sliding member 205, and a third cavity Q3 is formed between the second piston component 242 and the second end cover 214.

[0125] Based on the structure of the above valve body component, in this example, the aforementioned stop portion for restricting the sliding member 205 is provided at the connection between the first valve body 211 and the second valve body 212.

[0126] Next, several implementation methods for fixedly connecting the first valve body 211 and the second valve body 212 and several implementation methods for the stop portion and the isolation portion 251 will be specifically introduced.

[0127] Please refer to Figure 10 and Figure 11 , Figure 10 and Figure 11 show partial schematic diagrams of the first embodiment of the cooperation structure between the valve body component and the sliding member. Among them, Figure 10 the sliding member is in the first position in Figure 11 the sliding member is in the second position in

[0128] Figure 10 and Figure 11 In the solutions shown, the first valve body 211 and the second valve body 212 are specifically fixedly connected through an adapter seat 215 with a through hole.

[0129] 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 outside the first step portion 2151 and abuts against the first step surface. Specifically, the two can be fixedly connected 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 outside the second step portion 2152 and abuts against the second step surface. Specifically, the two are also fixedly connected by welding. In addition, in actual setting, the second valve body 212 can also be fixedly sleeved inside the second step portion 2152.

[0130] It can be understood that the first stepped 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 mating length, and the second stepped 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 mating length, ensuring the stability and reliability of the fixation of the adapter seat 215 with the first valve body 211 and the second valve body 212.

[0131] In this solution, the end face of the first stepped portion 2151 facing the first end cover 213 forms the aforementioned stop portion. As Figure 11 shown, when the sliding member 205 is in the second position, it abuts against the end face of the first stepped portion 2151; in addition, as Figure 10 shown, when the sliding member 205 is in the first position, it abuts against the first end cover 213.

[0132] It can be understood that in actual setting, the first valve body 211 can also be fixedly sleeved inside the first stepped portion 2151. At this time, the adapter seat 215 can be provided with a protruding portion extending towards the first end cover 213 to form a stop portion for restricting the sliding position of the sliding member 205.

[0133] 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.

[0134] According to the working positions of the aforementioned electromagnetic switching valve, in actual application, under normal working conditions, the pressure in the first cavity Q1 is higher than that in the second cavity Q2 or is the same as that in the second cavity Q2. The piston bowl 2511 is of a one-way sealing structure form. Therefore, by providing a piston bowl 2511 and making its opening face the first cavity Q1, the sealing requirement can be met.

[0135] Please refer to Figure 12 and Figure 13 , Figure 12 and Figure 13 which show partial schematic views of the second embodiment of the mating structure of the valve body component and the sliding member. Among them, Figure 12 the sliding member is in the first position in Figure 13 and the sliding member is in the second position in

[0136] Figure 12 and Figure 13 In the solution shown, the first valve body 211 and the second valve body 212 are directly connected. Among them, the first valve body 211 includes a main body portion 2111 and a connecting portion 2112. The diameter of the connecting portion 2112 is smaller than that of the main body portion 2111 and is used for connecting with the first valve body 211. Specifically, the first valve body 211 is fixedly sleeved outside the connecting portion 2112, and the two can be specifically fixed by welding.

[0137] Meanwhile, the connecting portion 2112 forms a stop portion for restricting the sliding position of the sliding member 205. As Figure 13 shown, when the sliding member 205 is in the second position, it abuts against the connecting portion 2112 to achieve position limitation.

[0138] In this solution, the isolation portion 251 of the sliding member 205 specifically includes an isolation block 2512 and a sealing ring 2513. The isolation block 2512 and the first valve body 211 are sealed through the sealing ring 2513.

[0139] In practical applications, in the Figure 10 and Figure 11 structures of the valve body components shown, the isolation portion 251 can adopt the Figure 12 and Figure 13 structures shown. Similarly, in the Figure 12 and Figure 13 structures of the valve body components shown, the isolation portion 251 can also adopt the Figure 10 and Figure 11 structures shown.

[0140] Please refer to Figure 14 and Figure 15 , Figure 14 and Figure 15 which show partial schematic diagrams of the third embodiment of the mating structure of the valve body component and the sliding member. Among them, Figure 14 the sliding member is in the first position in Figure 15 the sliding member is in the second position in

[0141] Figure 14 and Figure 15 In the solution shown, the first valve body 211 and the second valve body 212 are specifically fixedly connected through an adapter seat 215 with a through hole.

[0142] 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 structural form is similar to the Figure 10 and Figure 11 solutions shown above and will not be elaborated here.

[0143] The difference between the two is that in this solution, the adapter seat 215 further has an axial protrusion 2153 extending into the first valve body 211. The axial protrusion 2153 forms the stop portion for restricting the sliding position of the sliding member 205. As Figure 15 shown, when the sliding member 205 is in the second position, it abuts against the axial protrusion 2153 to achieve position limitation.

[0144] In this solution, the isolation part 251 of the sliding part 205 is specifically two piston bowls 2511 that are fixedly connected. The two piston bowls 2511 are arranged back to back. In this way, the isolation part 251 can achieve two-way sealing, which can ensure that relevant components are not damaged during abnormal operation.

[0145] On this basis, to prevent the piston bowl 2511 from being damaged when the isolation part 251 of the sliding part 205 abuts against the axially protruding part 2153, the diameter of the axially protruding part 2153 should be set smaller than the inner diameter of the piston bowl 2511.

[0146] The above Figures 10 to 15 In the three embodiments shown above, the sliding part 205 further includes a limiting part 252 fixedly connected to the isolation part 251. In the second position, the sliding part 205 is specifically limited by abutting the isolation part 251 against the stop part. Combining Figure 5 and Figure 6 , when the connecting rod assembly 204 abuts against the sliding part 205, it is specifically in direct contact with the limiting part 252.

[0147] In the illustrated solution, the isolation part 251 and the limiting part 252 are connected by a connecting rod 253. The limiting part 252 is specifically located in the small-diameter cavity, and its diameter is adapted to the small-diameter cavity, but it has through holes to connect the chambers on both sides. As mentioned above, the second cavity Q2 is formed between the isolation part 251 and the second piston component 242. Therefore, the setting of the limiting part 252 should not divide this cavity.

[0148] Of course, in actual setting, if the limiting part 252 is a solid structure, there should be a gap between its outer periphery and the valve cavity wall. The illustrated solution can ensure the stability of the overall movement of the sliding part 205.

[0149] It can be understood that in actual setting, the sliding part 205 is not limited to the specific structure shown in the figure, as long as it can meet the requirements of separating and forming the first cavity Q1 and the second cavity Q2, and limiting the sliding position of the connecting rod assembly 204.

[0150] In addition to the above several methods, in actual setting, the first valve body 211 and the second valve body 212 can also be an integrally formed structure.

[0151] Please refer to Figures 5 to 7 again. In order for the electromagnetic switching valve to have three working positions and ensure normal operation in each working position, the valve seat 202 and the slider 203 of its main valve need to have a reasonable structural cooperation.

[0152] 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 setting, the arrangement of the E interface, S interface, and C interface is not limited, as long as the following conditions can be met.

[0153] 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 inner cavity 203a of the slider. The slider 203 completely covers the E interface and the S interface of the valve seat 202, and both the E interface and the S interface are connected to the inner cavity 203a of the slider. Thus, the E interface can be connected to the S interface through the inner cavity 203a of the slider, and the C interface can be connected to the D interface through the valve cavity.

[0154] That is, the inner cavity 203a of the slider has a first projection on the plane where the upper surface of the valve seat 202 is located. This first projection covers at least part of the E interface, this first projection covers at least part of the S interface, but this first projection does not cover the C interface.

[0155] In this way, there are the following four situations for the cooperation between the slider 203 and the valve seat 202:

[0156] First, the first projection (the hatched part in the figure) of the inner cavity 203a of the slider completely covers the E interface and the S interface, as Figure 20a shown;

[0157] Second, the first projection (the hatched part in the figure) of the inner cavity 203a of the slider completely covers the E interface and partially covers the S interface, as Figure 20b shown;

[0158] Third, the first projection (the hatched part in the figure) of the inner cavity 203a of the slider completely covers the S interface and partially covers the E interface, as Figure 20c shown;

[0159] Fourth, the first projection (the hatched part in the figure) of the inner cavity 203a of the slider partially covers the E interface and also partially covers the S interface, as Figure 20d shown.

[0160] 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 inner cavity 203a of the slider.

[0161] That is, the inner cavity 203a of the slider has a second projection on the plane where the upper surface of the valve seat 202 is located. This second projection completely covers the S interface, this second projection covers at least part of the E interface, and this second projection covers at least part of the C interface.

[0162] In this way, there are the following four situations for the cooperation between the slider 203 and the valve seat 202:

[0163] First, the second projection (the hatched part in the figure) of the inner cavity 203a of the slider completely covers the E interface and the C interface, as Figure 21a shown;

[0164] Second, the second projection of the inner cavity 203a of the slider (the part with cross - hatching in the figure) completely covers the C interface and partially covers the E interface, as Figure 21b shown;

[0165] Third, the second projection of the inner cavity 203a of the slider (the part with cross - hatching in the figure) completely covers the E interface and partially covers the C interface, as Figure 21c shown;

[0166] Fourth, the second projection of the inner cavity 203a of the slider (the part with cross - hatching in the figure) partially covers the E interface and also partially covers the C interface, as Figure 21d shown.

[0167] When 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 inner cavity 203a of the slider. The slider 203 completely covers the S interface and the C interface of the valve seat 202, and both the S interface and the C interface are connected to the inner cavity 203a of the slider. Thus, 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 inner cavity 203a of the slider.

[0168] That is, the inner cavity 203a of the slider has a third projection on the plane where the upper surface of the valve seat 202 is located. This third projection covers at least part of the S interface, this third projection covers at least part of the C interface, and this third projection does not cover the E interface.

[0169] In this way, there are the following four situations for the cooperation between the slider 203 and the valve seat 202:

[0170] First, the third projection of the inner cavity 203a of the slider (the part with cross - hatching in the figure) completely covers the S interface and the C interface, as Figure 22a shown;

[0171] Second, the third projection of the inner cavity 203a of the slider (the part with cross - hatching in the figure) completely covers the C interface and partially covers the S interface, as Figure 22b shown;

[0172] Third, the third projection of the inner cavity 203a of the slider (the part with cross - hatching in the figure) completely covers the S interface and partially covers the C interface, as Figure 22c shown;

[0173] Fourth, the third projection of the inner cavity 203a of the slider (the part with cross - hatching in the figure) partially covers the S interface and also partially covers the C interface, as Figure 22d shown.

[0174] Among them, in order to ensure that when the slider 203 is in the second working position, its inner cavity can be connected to the E interface, the S interface, and the C interface, 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.

[0175] Please refer to Figure 16a 、 Figure 16b and Figure 16c , Figure 16a 、 Figure 16b and Figure 16c which respectively show schematic structural diagrams 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 mating structure.

[0176] As Figure 16b shown, the length L2 of the slider 203 satisfies:

[0177] L2>(D1) / 2 + L12 + L23 + (D3) / 2;

[0178] where 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.

[0179] As Figure 16a shown, in this example, when the slider 203 is in the first working position, the E interface and the S interface are completely within the inner cavity range 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 distance between the E interface and the S interface, and the radius of the S interface. Such a setting 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.

[0180] Furthermore, in the first working position, the area of the C interface covered by the slider 203 is not greater than half of the flow area of the C interface. Illustrated, that is, in the radial direction of the C interface, the length L02 of the C interface covered by the slider 203 is not greater than the radius (D3) / 2 of the C interface. In this way, it can also reduce the flow resistance of the refrigerant when flowing through the C interface in this working position and reduce the pressure loss.

[0181] As Figure 16c shown, in this example, when the slider 203 is in the third working position, the S interface and the C interface are completely within the inner cavity range 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 distance between the S interface and the C interface, and the radius of the C interface. Such a setting 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.

[0182] Furthermore, in the third working position, the area of the E interface covered by the slider 203 is not greater than half of the flow area of the E interface. Illustrated, that is, in the radial direction of the E interface, the length L03 of the E interface covered by the slider 203 is not greater than (D1) / 2. In this way, it can also reduce the flow resistance of the refrigerant when flowing through the E interface in this working position and reduce the pressure loss.

[0183] Specifically, for convenience of setting, the structure of the slider 203 is symmetrically arranged. At the same time, the through-diameters of the E interface, S interface, C interface, etc. are set, and the distance between the E interface and the S interface is the same as the distance between the S interface and the C interface, that is, D1 = D3, L12 = L23. It can be understood that after such setting, L02 = L03.

[0184] As Figure 16b shown, in this example, the slider 203 is in the second working position, and the area of the C interface covered by the slider 203 is greater than half of the flow area of the C interface. As shown in the figure, that is, in the radial direction of the C interface, the length L01 of the C interface covered by the slider 203 is greater than (D3) / 2, and the area of the E interface covered by the slider 203 is also greater than half of the flow area of the E interface.

[0185] It can be understood that in other examples, in order to reduce the flow resistance of the refrigerant in the second working position, it can be set so that the area of the C interface covered by the slider 203 is at least not greater than half of the flow area of the C interface, and / or the area of the E interface covered by the slider 203 is at least not greater than half of the flow area of the E interface.

[0186] Please refer to Figure 17a 、 Figure 17b and Figure 17c , Figure 17a 、 Figure 17b and Figure 17c which respectively show the schematic structural diagrams 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.

[0187] Similarly, in this example, the length L2 of the slider 203 satisfies:

[0188] L2 > (D1) / 2 + L12 + L23 + (D3) / 2;

[0189] where 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.

[0190] For convenience of setting, the structure of the slider 203 in this example is also symmetrically arranged, 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.

[0191] As Figure 17a shown, in this example, when the slider 203 is in the first working position, the E interface and the S interface are completely within the inner cavity range of the slider 203. With such setting, the flow resistance of the refrigerant flowing through the E interface and the S interface in this working position can be reduced, and the pressure loss can be decreased.

[0192] As Figure 17bAs shown, in this example, the slider 203 is in the second working position. In the radial direction of the C interface, the length L01 of the C interface covered by the slider 203 is less than half of the radius (D3) of the C interface, and the length of the E interface covered by the slider 203 is also less than the radius of the E interface. With this setting, the flow resistance of the refrigerant in the second working position can be reduced, and the pressure loss can be decreased.

[0193] As Figure 17c shown, in this example, when the slider 203 is in the third working position, the S interface and the C interface are completely within the inner cavity range of the slider 203. With this setting, the flow resistance of the refrigerant flowing through the S interface and the C interface in this working position can be reduced, and the pressure loss can be decreased.

[0194] In the illustrated solution, in the first working position, in the radial direction of the C interface, the length L02 of the C interface covered by the slider 203 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 of the E interface covered by the slider 203 is greater than the radius of the E interface.

[0195] It can be understood that in other examples, it can be further set 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 not greater 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 not greater 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.

[0196] Please refer to Figure 18a 、 Figure 18b and Figure 18c , Figure 18a 、 [[ID= and ​ which respectively show the schematic structural diagrams 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 cooperation structure.

[0197] Similarly, in this example, the length L2 of the slider 203 satisfies:

[0198] L2>(D1) / 2 + L12 + L23 + (D3) / 2;

[0199] where, 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.

[0200] For convenience of setting, the structure of the slider 203 in this example is also symmetrically arranged, 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.

[0201] As ​ shown, in this example, when the slider 203 is in the first working position, the E interface and the S interface are completely within the inner cavity range of the slider 203. With such a setting, the flow resistance of the refrigerant when flowing through the E interface and the S interface in this working position can be reduced, and the pressure loss can be lowered.

[0202] Meanwhile, in the radial direction of the C interface, the length L02 of the slider 203 covering the C interface is less than half of 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, and the pressure loss can be lowered.

[0203] As ​ shown, in this example, when the slider 203 is in the second working position, the E interface, the S interface, and the C interface are all completely within the inner cavity range of the slider 203. With such a setting, the flow resistance of the refrigerant is the smallest in the second working position.

[0204] On the basis of meeting this condition, in order to make the size of the slider 203 smaller so that the connecting component 204 can drive it to slide more easily, 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.

[0205] As ​ shown, in this example, when the slider 203 is in the third working position, the S interface and the C interface are completely within the inner cavity range of the slider 203. With such a setting, the flow resistance of the refrigerant when flowing through the S interface and the C interface in this working position can be reduced, and the pressure loss can be lowered.

[0206] Meanwhile, in the radial direction of the E interface, the length L03 of the slider 203 covering the E interface is less than half of the radius (D1) / 2 of the E interface. In this way, the flow resistance of the refrigerant when flowing through the C interface in this working position can also be reduced, and the pressure loss can be lowered.

[0207] Furthermore, in order to reduce the size of the valve seat 202 and simplify the structure, on the basis of meeting the above conditions, 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. 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.

[0208] Please refer to ​ , ​ which is a schematic structural diagram of another embodiment of the electromagnetic switching valve provided by the present invention.

[0209] ​ The electromagnetic switching valve shown is the same as ​ the electromagnetic switching valve shown in terms of working principle and main structure. The difference between the two is that in this embodiment, the installation position of the second pilot valve component 207 of the electromagnetic switching valve is different. Only this difference point will be described in detail below, and other structures can be understood by referring to the foregoing description.

[0210] As ​ shown, in this embodiment, a connection port communicating with the main valve cavity Q4 is provided 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 this connection port. Compared with ​ this solution, the second sleeve cavity is directly communicated with the main valve cavity Q4, and the capillary d2 can be omitted.

[0211] In addition, in this example, the first valve body 211 is arranged on the right side of the second valve body 212, ​ in the example shown, the first valve body 211 is arranged on the left side of the second valve body 212, and in practice, it can be set according to actual needs.

[0212] The electromagnetic switching valve provided by the present invention and the refrigeration system having the same have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. Solenoid switching valve, characterized in that: It includes a valve body component, a first pilot valve component and a second pilot valve component; 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 form an integral structure; the diameter of the first valve body is larger than the diameter of the second valve body; The valve body further comprises a first end cover, a sliding member and a stopper, wherein the first end cover blocks the opening of the first valve body; the sliding member comprises an isolating portion and a limiting portion; The second valve body is provided with a valve seat, a slider, and a connecting rod assembly. The valve seat is provided with an E interface, an S interface, and a C interface. The second valve body is provided with a D interface. The slider has a slider inner cavity. The slider is driven by the connecting rod assembly and can slide along the valve seat. The connecting rod assembly includes a connecting rod and a first piston component and a second piston component fixed at both ends of the connecting rod. The valve body component has a valve cavity, the sliding member can slide in the valve cavity to approach or move away from the valve seat, and the stopper is used to limit the sliding position of the sliding member; The valve cavity includes a main valve cavity, the main valve cavity is formed between the first piston component and the second piston component, the main valve cavity is communicated with the D interface, the valve cavity also includes a first cavity, a second cavity and a third cavity, the first cavity is formed between the isolation portion and one end wall of the valve body component, the second cavity is formed between the isolation portion and the second piston component, and the third cavity is formed between the first piston component and the other end wall of the valve body component. The first pilot valve component and the second pilot valve component can change the pressure difference between the first cavity and the second cavity, and the pressure difference between the second cavity and the third cavity, so as to switch the sliding direction of the slider and the sliding direction of the sliding member, so that the solenoid switching valve has three working positions: 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; In the second working position, the inner cavity of the slider is connected to the E interface, the S interface, and the C interface, the isolation portion is relatively far away from the first end cover, the isolation portion abuts against the stopper, and the limiting portion abuts against the first piston component; In the third working position, the inner cavity of the slider is connected to the S interface and the C interface, the isolation portion is relatively far away from the first end cover and the isolation portion is against the stop portion, and the limiting portion is relatively far away from the first piston component.

2. The electromagnetic switching valve according to claim 1, characterized in that: The first valve body has a large-diameter cavity, and the second valve body has a small-diameter cavity. 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, F f is the friction force of the connecting rod assembly, F f ' is the friction force of the sliding member.

3. The electromagnetic switching valve according to claim 1, characterized in that: It also includes a second end cover, which is used to seal the opening of the second valve body; the first valve body and the second valve body are cylindrical structures, the first valve body and the second valve body are fixedly connected and the inner cavities of the two are connected; the solenoid switching valve is in the third working position, and the second piston component is in contact with the second end cover.

4. The electromagnetic switching valve according to claim 3, characterized in that: The first valve body and the second valve body are fixedly connected via an adapter having a through hole. The adapter includes a first step portion and a second step portion. The first step portion has a first step surface facing the first valve body. The first valve body is fixedly sleeved on the first step portion and abuts against the first step surface. The second step portion has a second step surface facing the second valve body. The second valve body is fixedly sleeved on the second step portion and abuts against the second step surface. Wherein, the stopping portion includes the first step portion.

5. The electromagnetic switching valve according to claim 3, characterized in that: The first valve body includes a main body and a connecting portion. The diameter of the connecting portion is smaller than that of the main body. The second valve body is sleeved and fixed to the connecting portion. The stopper includes the connecting portion.

6. The electromagnetic switching valve according to claim 4 or 5, characterized in that: The isolation portion includes a piston bowl, the outer peripheral wall of the piston bowl is slidably sealed with the inner peripheral wall of the first valve body, and the opening of the piston bowl faces the first end cover; Alternatively, the isolation portion includes an isolation block and a sealing ring, and the isolation block and the first valve body are sealed by the sealing ring.

7. The electromagnetic switching valve according to claim 3, characterized in that: The first valve body and the second valve body are fixedly connected via an adapter having a through hole. The adapter includes a first step portion and a second step portion. The first step portion has a first step surface facing the first valve body. The first valve body is fixedly sleeved on the first step portion and abuts against the first step surface. The second step portion has a second step surface facing the second valve body. The second valve body is fixedly sleeved on the second step portion and abuts against the second step surface. The adapter seat further includes an axial protrusion extending toward the first valve body, and the stopper includes the axial protrusion.

8. The electromagnetic switching valve according to claim 7, characterized in that: The isolation portion includes two piston bowls, which are fixedly connected and arranged back to back; the diameter of the axial protrusion is smaller than the inner diameter of the piston bowl.

9. The electromagnetic switching valve according to any one of claims 1-5, 7-8, characterized in that: The isolating portion and the limiting portion are fixedly connected via a connecting rod, and the limiting portion can limit the sliding position of the sliding block when the sliding block slides toward the side where the sliding member is located.

10. 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 port of the electromagnetic switching valve; The E port and the C port of the electromagnetic switching valve are respectively connected to a port of the first outdoor heat exchanger and a port 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 pipe; The second branch is also provided with a flow regulating valve.

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