WO2019129190A1 - Electromagnetic switching valve - Google Patents

Abstract

Disclosed is an electromagnetic switching valve, comprising a main valve (1) and a pilot valve. The pilot valve comprises a first pilot valve (21) and a second pilot valve (31); and a first valve body (211) comprises a first flow guide portion (2113), and a second valve body (311) comprises a second flow guide portion (3113). The main valve (1) comprises a main valve body (11), the main valve body (11) comprising a first flow passage (101), a second flow passage (102), a third flow passage (103), and a forth flow passage (104), wherein the first flow guide portion (2113) and the second flow guide portion (3113) are respectively fixedly connected to the main valve body (11).

Description

Electromagnetic switching valve

The present application claims priority to Chinese Patent Application No. 20171147139, filed on Jan. 29,,,,,,,,,,,,,,,,,,,,,

Technical field

The present invention relates to the field of refrigeration control, and more particularly to an electromagnetic switching valve.

Background technique

Please refer to FIG. 1. FIG. 1 is a schematic view showing the structure of a typical electromagnetic four-way valve.

As shown, a conventional electromagnetic four-way valve is generally applicable to a refrigeration system such as an air conditioning system including a main valve 10' and a pilot valve 20'; the main valve 10' includes a valve body 11' having a compressor and a compressor Exhaust pipe D connected to the exhaust port (connected to the high pressure zone), suction pipe S connected to the compressor suction port (connected to the low pressure zone), pipette E connected to the indoor heat exchanger 30' and outdoor The connector 40 connected to the heat exchanger 40'; the end of the valve body 11' is provided with an end cover 12', the valve seat 13' is fixed inside, and the slider 15' and the piston 16' driven by the connecting rod 14' are also provided. The valve seat 13' contacts and supports the slider 15' to form a pair of motion pairs, and the piston 16' and the valve body 11' constitute a pair of motion pairs.

The small valve body of the pilot valve 20' is fixed with a capillary d connected to the exhaust pipe D of the main valve 10', that is, the inner cavity of the pilot valve 20' is also in communication with the high pressure region of the main valve; the small diameter of the pilot valve 20' The valve seat has three valve ports, and a capillary e, a capillary tube s, a capillary tube c connected to the left end cover of the main valve 10', the suction pipe S, and the right end cover of the main valve 10' are respectively fixed from left to right; The small end of the small valve body of the valve 20' is fixed with a sleeve, and the outer side of the sleeve is provided with an electromagnetic coil 50'.

In an operating state, when the refrigeration system needs to be cooled, the electromagnetic coil 50' is not energized, and the core iron of the inner cavity of the pilot valve 20' is driven by the return spring force to drive the sliding bowl to the left position, so that the capillary e and the capillary s In the same way, the capillary c and the capillary d are in communication, so that the left chamber of the main valve 10' is a low pressure region, the right chamber is a high pressure region, and a pressure difference is formed between the left and right chambers of the main valve 10', pushing the slider 15' and the piston 16' To the left side, the nozzle E and the suction pipe S are communicated, and the exhaust pipe D is in communication with the connection pipe C. At this time, the flow path of the refrigerant in the refrigeration system is: compressor exhaust port→exhaust pipe D→valve body 11 valve Cavity → take-over C → outdoor heat exchanger 40' → throttling element 60' → indoor heat exchanger 30' → take-over E → slider 15' inner cavity → suction pipe S → compressor suction port, refrigeration system is in refrigeration Working status

When the refrigeration system needs to be heated, the electromagnetic coil 50' is energized, and the core iron of the inner cavity of the pilot valve 20' is driven to move to the right by the force of the return spring, so that the capillary c and the capillary s are in communication, and the capillary e and the capillary d are connected. Therefore, the left chamber of the main valve 10' is a high pressure region, the right chamber is a low pressure region, and a pressure difference is formed between the left and right chambers of the main valve 10', pushing the slider 15' and the piston 16' to the right side, so that the nozzle C and the suction The gas pipe S communicates, and the exhaust pipe D communicates with the nozzle E. At this time, the circulation path of the refrigerant in the refrigeration system is: compressor exhaust port→exhaust pipe D→valve body 11 valve chamber→taker E→indoor heat exchanger 30'→throttle element 60'→outdoor heat exchanger 40'→taker C→slider 15' inner cavity→intake pipe S→compressor suction port, the refrigeration system is in heating state.

As described above, the commutation of the main valve 10' can be realized by the cooperation of the pilot valve 20' and the electromagnetic coil 50', thereby switching the flow direction of the refrigerant, and switching between the heating operation state and the cooling operation state of the refrigeration system.

The above-mentioned electromagnetic four-way valve is suitable for the refrigeration system of the household air conditioner, but with the development of technology, the application field of the electromagnetic switching valve is expanding continuously. For example, in the field of automobile air conditioning, an electromagnetic switching valve is also needed to switch the flow of the refrigerant. In particular, the carbon dioxide refrigerant commonly used in automobile air conditioners is different from ordinary household air conditioners. If the above-mentioned electromagnetic four-way valve is directly applied to the automobile air conditioner, the corresponding working conditions cannot be met, and there are also differences in the flow switching requirements for the refrigerant. Moreover, the use of the automobile makes the electromagnetic four-way valve often affected by the vibration, and each welding point has a hidden danger in the long-term vibration environment.

Therefore, how to design an electromagnetic switching valve to be applicable to an automobile air conditioning system of high temperature and high pressure refrigerant and reduce the risk of failure due to factors such as high pressure and vibration is a technical problem to be solved by those skilled in the art.

Summary of the invention

It is an object of the present invention to provide an electromagnetic switching valve for an automotive air conditioning system that can be applied to high temperature and high pressure refrigerants. To this end, the present invention adopts the following technical solutions:

An electromagnetic switching valve, comprising: a main valve and a pilot valve, the pilot valve comprising a first pilot valve and a second pilot valve;

The first pilot valve includes a first valve body and a first coil that mates with the first valve body, the second pilot valve includes a second valve body and a second mating with the second valve body a coil, the first valve body includes a first flow guiding portion, and the second valve body includes a second flow guiding portion;

The main valve includes a main valve body, and the main valve body includes a first flow path, a second flow path, a third flow path, and a fourth flow path, and the first flow guiding portion and the second flow guiding portion respectively Fixedly connected to the main valve body;

The first flow guiding portion includes a first valve port portion, a first flow guiding channel and a second flow guiding channel, the first valve port portion includes a first valve port, and one end of the first guiding channel The first valve port is in communication, and the other end of the first flow guiding channel is in communication with the third flow path;

The second flow guiding portion includes a second valve port portion, a third flow guiding channel and a fourth guiding channel, the second valve port portion includes a second valve port, and one end of the fourth guiding channel The second valve port is in communication, and the other end of the fourth air guiding channel is in communication with the third flow channel.

On the basis of the above technical solutions, some technical features may be further improved or refined to form the following technical solutions. The following technical features may be applied separately or in combination:

The main valve body is formed into a unitary structure by using a metal material. The main valve body is provided with a main valve chamber, and the main valve chamber is provided with a connecting rod and a first piston and a second piston respectively fixed to the two ends of the connecting rod. a first cavity formed between the first flow guiding portion and the first piston, a second cavity formed between the first piston and the second piston, and a third cavity formed in the first cavity Between the second piston and the second flow guiding portion.

The first flow guiding channel and the third flow channel communicate with each other through a first connecting pipe, and the fourth guiding flow channel and the third flow channel communicate with each other through a second connecting pipe, The first connecting pipe and the second connecting pipe are both located outside the main valve body.

The first flow guiding portion and the main valve body are fixed by press fitting and welding, and the second flow guiding portion and the main valve body are fixed by press fitting and welding.

The main valve body is fixedly connected with a main valve seat, the main valve seat is provided with a flat portion and a first through hole, a second through hole and a third through hole penetrating the flat portion, the first through hole and the first through hole The second flow passage is in communication, the second through hole is in communication with the third flow passage, and the third through hole is in communication with the fourth flow passage.

Also included is a slider that is displaced with displacement of the link and that is slidable along the flat portion, the slider having two working positions:

The first working position, the slider blocks the second flow channel, and connects the fourth flow channel to the second cavity;

In the second working position, the slider conducts the third flow path and the fourth flow path, and connects the second flow path with the second cavity.

Also included is a slider that is displaced with displacement of the link and that is slidable along the flat portion, the slider having two working positions:

In the first working position, the slider electrically connects the second flow channel and the third flow channel, and connects the fourth flow channel to the second cavity;

In the second working position, the slider conducts the third flow path and the fourth flow path, and connects the second flow path with the second cavity.

The first valve body further includes a first static iron core and a first moving iron core, the first moving iron core is fixedly connected with a first blocking portion, the first static iron core and the first moving iron core A first return spring is disposed between the cores, and the first plugging portion blocks the first valve port when the first coil is not energized.

The second valve body further includes a second static iron core and a second moving iron core, wherein the second moving iron core is fixedly connected with a second blocking portion, the second static iron core and the second moving iron A second return spring is disposed between the cores, and the second plugging portion blocks the second valve port when the second coil is not energized.

The electromagnetic switching valve provided by the embodiments of the present invention adopts a manner that the two pilot valves are directly connected to the main valve body, thereby reducing the failure of the welded portion of the valve body and the connecting pipe in the background art to be affected by factors such as high pressure and vibration. Hidden dangers, the overall structure is stronger and the work is more reliable.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic view showing the structure of a typical electromagnetic four-way valve;

2 is a schematic structural view of a first working state of an electromagnetic switching valve according to a first embodiment of the present invention;

3 is a schematic structural view of a second working state of an electromagnetic switching valve according to a first embodiment of the present invention;

4 is a schematic view showing the appearance of an electromagnetic switching valve according to a first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a link assembly according to another embodiment of the present invention; FIG.

6 is a schematic structural view of a piston according to another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an electromagnetic switching valve according to another embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Please refer to FIG. 2, FIG. 3 and FIG. 4. FIG. 2 is a schematic structural diagram of a first working state of an electromagnetic switching valve according to a first embodiment of the present invention, and FIG. 3 is a first embodiment of an electromagnetic switching valve according to a first embodiment of the present invention. FIG. 4 is a schematic view showing the appearance of an electromagnetic switching valve according to a first embodiment of the present invention.

The electromagnetic switching valve includes a main valve and a pilot valve. The main valve 1 includes a main valve body 11, and the main valve body 11 can be processed by metal casting such as stainless steel or forging. The main valve body 11 can be an integral structure and fixed with the pilot valve so as to be inside the main valve body. A main valve chamber 111 is formed. The first flow passage 101, the second flow passage 102, the third flow passage 103, and the fourth flow passage 104 are extended to the outside of the main valve body along the main valve chamber 111. The second flow path 102, the third flow path 103, and the fourth flow path 104 are located on the same side, and the first flow path 101 is located on the opposite side. Wherein, the first flow path 101 can communicate with the high pressure side of the refrigeration system (ie, the exhaust port of the compressor), and the third flow path 103 is connected to the low pressure side of the refrigeration system (ie, the side of the suction port of the compressor) In the same manner, the refrigerant at the first flow path 101 is always maintained at a high temperature and a high pressure while the refrigerant at the third flow path 103 is always maintained at a relatively low temperature and a low pressure.

The main valve body 11 is formed of a metal material and directly forms four flow passages or is processed to form four flow passages. Compared with the background art, the valve body and the nozzle are not required to be welded, thereby reducing the high pressure and vibration of the welded portion. The hidden dangers of the impact, the overall structural strength is higher, and the work is more reliable.

The main valve seat 111 is provided with a main valve seat 12 fixedly connected to the main valve body 11, and the main valve seat 12 is correspondingly provided with a first through hole 121, a second through hole 122, a third through hole 123, and a main valve seat. 12 has a flat portion 124 for sliding the slider, and the first through hole 121, the second through hole 122, and the third through hole 123 respectively penetrate the flat portion 124 and respectively correspond to the second flow path 102 and the third flow path 103. The fourth flow path 104 is connected to each other. The first through hole 121, the second through hole 122, and the third through hole 123 may be straight through holes or unequal through holes having a stepped shape, or may be irregularly shaped through holes. It is sufficient that the respective portions of the main valve chamber 111 can penetrate the second flow path 102, the third flow path 103, and the fourth flow path 104, respectively.

In the main valve chamber 111, a slider 13, a connecting rod 14 and two pistons 15 are provided, wherein the slider 13 includes a flat portion for fitting with the flat portion 124 of the main valve seat, and can be at the connecting rod 14 Driven under the corresponding extent along the flat portion 124, the piston has two working positions, and the slider 13 further includes a recess concavely inward from the flat portion, the recess cooperates with the main valve seat to form a cavity that can be used for conduction As shown in FIG. 3, the third flow path 103 and the fourth flow path 104 may communicate with each other through a cavity formed by the slider 13 and the main valve seat. As shown in FIG. 2, when the slider 13 is at the left position (first working position), the second flow path 102 can be prevented from communicating with the main valve chamber 111, and the second flow path 102 is not associated with the slider 13 and the main The cavity formed by the valve seat 12 is in communication; at this time, the fourth flow path 104 is electrically connected to the main valve chamber 111, and is also indirectly connected to the first flow path 101, which is defined as the first working position. When the slider 13 slides to the right side, the third flow path 103 and the fourth flow path 104 can be turned on, while the first flow path 101 is electrically connected to the second flow path 102 through the main valve chamber 111. This is defined as the second working position. The connecting rod 14 is fixedly connected with the piston 15 at both ends of the connecting rod 14. The piston 15 includes a first piston 151 located on the left side of the main valve chamber 111 and a second piston 152 located on the right side of the main valve chamber, the first piston 151 and the second piston The main valve chamber 111 is divided into three relatively independent spaces.

A first pilot valve 21 and a second pilot valve 31 are respectively mounted on both sides of the main valve body 11 along the central axis direction of the main valve chamber 111, and the structures of the first pilot valve 21 and the second pilot valve 31 may be set to the same.

The first pilot valve 21 includes a first valve body 211 and a first coil 212. The first valve body 211 includes a first static iron core 2111, a first movable iron core 2112, a first flow guiding portion 2113, and a first flow guiding portion 2113. The first valve port portion includes a first valve port 2115; the first moving iron core 2112 is connected to the first blocking portion 2114, and is disposed between the first movable iron core 2112 and the first static iron core 2111. A first return spring 2118 is disposed between the first static iron core 2111 and the first sleeve 2119, and the first movable iron core 2112 can slide inside the first sleeve 2119, when the first sleeve 2119 and the first guide When the flow portion 2113 is fixed, the first pilot valve cavity 2119a is formed therebetween; when the first movable iron core 2112 is operated, the first plugging portion 2114 can be driven to move. When the first coil 212 is not energized, The first blocking portion 2114 blocks the first valve port 2115 of the first flow guiding portion 2113.

The second pilot valve 31 includes a second valve body 311 and a second coil 312. The second valve body 311 includes a second static iron core 3111, a second movable iron core 3112, a second flow guiding portion 3113, and a second flow guiding portion 3113. The second valve port portion includes a second valve port 3115; the second movable iron core 3112 is connected to the second blocking portion 3114, and is disposed between the second movable iron core 3112 and the second static iron core 3111. A second return spring 3118 is disposed between the second static iron core 3111 and the second sleeve 3119, and the second movable iron core 3112 can slide inside the second sleeve 3119, when the second sleeve 3119 and the second guide When the flow portion 3113 is fixed, the second pilot valve cavity 3119a is formed therebetween; when the second movable iron core 3112 is operated, the second plugging portion 3114 can be driven to move. When the second coil 312 is not energized, The second blocking portion 3114 blocks the second valve port 3115 of the second flow guiding portion 3113.

The first flow guiding portion 2113 and the second flow guiding portion 3113 are respectively sealingly and fixedly connected to both sides of the main valve body 11, as can be fixed by welding, so that the first piston 151 and the second piston 152 divide the main valve chamber 111 into The first cavity 1111 is formed between the first flow guiding portion 2113 and the first piston 151, and the second cavity 1112 is formed between the first piston 151 and the second piston 152, and the second piston 152 is A third cavity 1113 is formed between the second flow guiding portions 3113. It should be noted that the spatial size of the first cavity 1111 and the third cavity 1113 may vary with the relative movement of the piston 15.

The first flow guiding portion 2113 may be integrally formed or formed by using a metal material such as stainless steel, and is provided with a first valve port 2115, and a first guiding channel 2116 and a second guiding channel disposed inside the first guiding portion 2113. 2117, the first guiding channel 2116 and the second guiding channel 2117 are communicated through the first pilot valve cavity 2119a and the first valve port 2115, and one end of the second guiding channel 2117 is connected to the first pilot valve cavity 2119a, The other end of the second flow guiding passage 2117 communicates with the first cavity 1111 when the electromagnetic switching valve is in the second working position. In the specific processing, the first flow guiding channel 2116 and the second flow guiding channel 2117 may be formed by drilling or the like. In the present embodiment, the first flow guiding channel 2116 and the third flow channel 103 are communicated through the first connecting pipe 22, and the other end of the first guiding channel 2116 is in communication with the first valve port 2115. The first connecting pipe The body 22 can be located outside of the main valve body 11.

It should be noted that the first guiding channel 2116 and the second guiding channel 2117 can be opened on the body of the first guiding portion 2113. The present invention does not combine the specific orientation, the opening or the multiple channels of the channel. To perform the limitation, only the following conditions are required: one end of the second flow guiding channel 2117 is in communication with the first cavity 1111 when the electromagnetic switching valve is in the second working state. The first guiding channel 2116 and the second guiding channel 2117 can each be formed by combining two or more linear channels, and the linear channel can be formed by drilling.

Thus, when the first moving iron core 2112 drives the first blocking portion 2114 to abut the first valve opening 2115 to block the first valve opening 2115, between the first guiding channel 2116 and the second guiding channel 2117 It is in the cut off state.

The second flow guiding portion 3113 may be integrally formed or machined with a metal material, and has a second valve opening 3115, and a third guiding channel 3116 and a fourth guiding channel 3117 disposed inside the second guiding portion 3113. The third flow guiding channel 3116 and the fourth guiding channel 3117 are in communication through the second valve port 3115 and the second pilot valve cavity 3119a. In the specific processing, the third flow guiding channel 3116 and the fourth flow guiding channel 3117 may be formed by drilling or the like. In the present embodiment, the fourth flow guiding channel 3117 and the third flow channel 103 are connected by the second connecting pipe 32, and the other end of the fourth guiding channel 3117 is in communication with the second valve port 3115. The second connecting pipe 32 The body may be located outside of the main valve body 11. One end of the third flow guiding channel 3116 communicates with the second pilot valve cavity 3119a, and the other end of the third flow guiding channel 3116 communicates with the third cavity 1113 in the first working state.

In this specification, the prefixes “first, second, third, fourth” in the names of the components are merely named to facilitate the distinction between different components, and there is no specific order, such as the second guide. The flow portion 3113 is provided with the third flow guiding channel 3116 and the fourth flow guiding channel, and does not mean that the second flow guiding portion 3113 must also be provided with the first guiding channel or the second guiding channel at the same time.

It should be noted that the third guiding channel 3116 and the fourth guiding channel 3117 can be opened on the body of the second guiding portion 3113. The present invention does not combine the specific orientation, opening or multiple channels of the channel. The limitation is as follows: only one end of the third flow guiding channel 3116 is in communication with the third cavity 1113 in the first working state, and the other end of the third guiding channel 3116 and the second pilot valve cavity 3119a One end of the fourth flow guiding passage 3117 communicates with the second valve port 3115, and the other end communicates directly or indirectly with the third flow path 103 provided by the main valve body 111. The third flow guiding channel 3116 and the fourth guiding channel 3117 can each be formed by combining two or more linear channels, and the linear channel can be formed by drilling.

Thus, when the second moving iron core 3112 drives the second blocking portion 3114 to abut against the second valve opening 3115 to block the second valve opening 3115, between the third guiding channel 3116 and the fourth guiding channel 3117 It is in the cut off state.

The first flow guiding portion 2113 and the main valve body 11 can be fixed by press fitting and welding. In the manufacturing process, the first guiding channel 2116 and the second guiding channel 2117 are first processed on the first guiding portion 2113. Then, the first flow guiding portion 2113 is loaded into one end of the main valve body, and then the welding is fixed. At this time, one end of the second guiding flow channel 2117 is located outside the main valve body, and the first connecting pipe 22 is welded. The second flow guiding passage 2117 is in communication with the third flow passage 103 of the main valve body. Similarly, the second flow guiding portion 3113 can adopt the same manufacturing method and be fixed to the main valve body 11 and communicate with the fourth flow guiding passage 3117 and the third flow passage 103 of the main valve body using the second connecting pipe 32.

As an alternative assembly manner, an externally threaded structure may be provided on the first flow guiding portion 2113, and a corresponding internal thread structure is disposed on the main valve body 11, and then the first flow guiding portion 2113 is threadedly engaged. The method is fixed to the main valve body 11 and then welded. Similarly, the second flow guiding portion 3113 may be fixed to the main valve body 11 by screwing and welding.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a link assembly according to another embodiment of the present invention.

The link 14 includes a body portion 140 and a first connecting portion 141 and a second connecting portion 142 that are coupled to both ends of the body portion 140. The main body portion 140 is substantially in the shape of a plate, and a bent portion is provided on the side of the plate as a reinforcing portion. The main body portion 140 can be formed by using a plate material. The engaging portion 1401 is opened in the middle of the main body portion 140 for the slider 13 . The phases are engaged, so that when the link 14 is moved, the slider 13 can be driven to move in the left-right direction. In order to reduce the pressure loss, the notch portion 1402 may be provided on both sides of the engaging portion 1401, and the number of the notch portions 1402 is not limited. In the present embodiment, the number of the notch portions 1402 is two, and the notch portion is used. The arrangement of 1402 allows the upper and lower sides of the body portion 140 to have more penetration areas, reducing the resistance of the connecting rod to the flow of refrigerant in the second chamber 1112.

A first connecting portion 141 and a second connecting portion 142 are fixedly coupled to both ends of the main body portion 140, respectively. The first connecting portion 141 can be used for fixed connection with the first piston 151, and the second connecting portion 142 can be used for fixed connection with the second piston 152. Specifically, the first mounting portion 1403 and the second mounting portion 1404 may be provided at both ends of the plate-like main body portion 140, and may be formed by drilling when the specific processing is performed.

The first connecting portion 141 includes a first connecting portion body 1411 that is substantially in the shape of a flat disk, and a first mating portion 1412 that is fixedly coupled or integrated with the first connecting portion body 1411. In the embodiment, the first connecting portion body 1411 is formed on the basis of an annular shape, so that the height of the first connecting portion body 1411 can be relatively reduced, that is, substantially flat, and the height is smaller than the ring on both sides. The distance between the parts. The first engaging portion 1412 may be integrally formed with the first connecting portion body 1411 by a material, or may be integrally formed by means of various fixed connections such as welding and tight fitting. The first engaging portion 1412 includes a first groove portion 1414 and a first hole portion 1413. The first groove portion 1414 is substantially flat and conforms to the shape of the end portion of the link body portion 140; the first hole portion 1413 runs through The first mating portion 1412 is adapted to the shape of the first mounting portion 1403 provided by the body portion 140. Thus, at the time of installation, the end of the body portion 140 can be inserted into the first groove portion 1414, and the first mounting portion 1403 can be aligned with the first hole portion 1413, and then the first fixing portion 143 can be used to pass through the first hole portion. 1413 and a first mounting portion 1403. The first fixing portion 143 is made of a single material. After the assembly is completed, the two ends are thick and thin. In the assembly, the first fixing portion 143 can be firstly formed into a thick end shape, and then passed through the first hole portion. The first mounting portion 1403 and the first mounting portion 1403 deform the end portion through which the first fixing portion 143 passes, thereby fixing the link main body portion 140 and the first connecting portion 141.

The number of the first hole portion 1413 and the first mounting portion 1403 may be set to two, so that the connection strength is relatively higher.

Similarly, as a symmetrical structure, the second connecting portion 142 also includes a second connecting portion body 1421 that is substantially in the shape of a flat disk, and a second engaging portion 1422 that is fixedly coupled or integrally formed with the second connecting portion body 1421. That is, the second engaging portion 1422 may be manufactured integrally with the second connecting portion main body 1421 by a material, or may be integrally formed by means of various fixing connections such as welding and tight fitting. The second fitting portion 1422 includes a second groove portion 1424 and a second hole portion 1423. The second groove portion 1424 is substantially flat and conforms to the shape of both ends of the link body portion 140 or the second groove portion 1424. The height is adapted to the shape of both ends of the depth link body portion 140; the second hole portion 1423 penetrates the second fitting portion 1422 and is adapted to the shape of the second mounting portion 1404 provided by the body portion 140. Thus, at the time of installation, the end of the body portion 140 can be inserted into the second groove portion 1424, and the second mounting portion 1404 can be aligned with the second hole portion 1423, and then the second fixing portion 144 can be used to pass through the second hole portion. 1423 and the second mounting portion 1404, the second fixing portion 144 is made of a single material, and is in a state of thick and thin at both ends after the assembly is completed. Specifically, when assembling, the second fixing portion 144 may be firstly formed into a thick shape at one end. Then, the second hole portion 1423 and the second mounting portion 1404 are passed through, and the link body portion 140 and the second connecting portion 142 are fixed by deforming one end through which the second fixing portion 144 passes. This way of fixed connection has the advantage of not requiring welding, reducing environmental pollution during processing.

It should be noted that the number of the second hole portion 1423 and the second mounting portion 1404 can be set to two, so that the connection strength is higher.

The first connecting portion 141 is provided with a first threaded portion 145, and the second connecting portion 142 is provided with a second threaded portion 146, the first threaded portion 145 is for fixed connection with the first piston 151, and the second threaded portion 146 is for second The piston 152 is fixedly coupled.

The link 14 described in this embodiment includes a main body portion 140, a first connecting portion 141, and a second connecting portion 142, and is then fixedly connected by the first fixing portion 143 and the second fixing portion 144 as a whole. At the same time, the first threaded portion 145 and the second threaded portion 142 are disposed on the first connecting portion body 1411 and the second connecting portion body 1421, so that when the piston is connected with the connecting rod screw, the screw is subjected to high pressure impact during the working process. Small, effectively preventing the hidden troubles such as screwing off when the pressure in the main valve body is too large. At the same time, with such a configuration, the first threaded portion 145 and the second threaded portion 146 can be machined to any length and number as desired to achieve sufficient joint strength. In the embodiment shown in FIG. 5, the number of the first threaded portion 145 and the second threaded portion 146 is four, and of course, it is not limited to four, and may be four or more in practical use. In addition, the integral assembly of the connecting rod is evenly stressed during the operation, and the contact faces of the first connecting portion 141 and the second connecting portion 142 and the piston member are relatively large, and the stability is better.

It should be noted that the embodiment of the above-mentioned connecting rod 14 is not limited to the electromagnetic switching valve used in the present invention. It should be understood by those skilled in the art that the combined structure of the connecting rod and the piston is a relative to the main valve body. The embodiment of the link can be applied to a high-pressure and vibration environment with harsh working conditions, and can also be applied to an environment with superior working conditions. That is to say, the above-mentioned link structure can also be applied to a common electromagnetic four-way valve product in the field of household air conditioners, such as the technical solution described in the background art.

The piston 15 includes a first piston 151 and a second piston 152. The first piston 151 is fixed to the first connecting portion 141 of the connecting rod 14, and the second piston 152 is fixed to the second connecting portion 142 of the connecting rod 14.

Please refer to FIG. 6. FIG. 6 is a schematic structural view of a piston according to another embodiment of the present invention.

The first piston 151 includes a piston spacer 1513 and a piston pressing piece 1515. The piston bowl 1514 is disposed between the piston spacer 1513 and the piston pressing piece 1515. The piston spacer 1513 and the piston pressing piece 1515 are substantially disc-shaped. And a plate member having a mounting hole, the piston bowl 1514 has a generally disc-shaped piston bowl body 1514a and a piston sliding portion 1514b extending along the piston bowl body, and when the piston member is assembled into the electromagnetic switching valve, When the rod 14 drives the piston 15 to move, the piston sliding portion 1514b slides along the peripheral wall of the main valve chamber 111 to change the space of the first cavity 1111 with the third cavity 1113.

A piston spring piece 1518 is further disposed between the spring pressing piece 1515 and the piston bowl 1514, and the piston spring piece 1518 can provide a supporting force to the piston sliding portion 1514b.

The piston washer 1513, the piston presser 1515, the piston bowl 1514, and the piston spring piece 1518 are each provided with an intermediate through hole and fixed by a bushing 1517. Specifically, in the present embodiment, the bushing 1517 has a substantially cylindrical bushing body 1517a, and a first extending portion 1517b and a second extending portion 1517c are formed at edges of both ends thereof. After assembly, the piston washer 1513, the piston tab 1515, the piston bowl 1514, and the piston spring piece 1518 are secured together by the first extension 1517b and the second extension 1517c. The first extending portion 1517b and the second extending portion 1517c may be formed of a single material with the bushing body 1517a, for example, first crimping and bending at one end of the bushing 1517a to deform the first extending portion. 1517b, and the bushing 1517 is installed in the intermediate through hole of the piston gasket 1513, the piston pressing piece 1515, the piston bowl 1514 and the piston spring piece 1518, and then the other end of the bushing is crimped and deformed. The second extension 1517b is formed to achieve the purpose of fixation. As an alternative, the second extension 1517c may be formed first, and the first extension 1517b may be formed after assembly.

Of course, the first extending portion 1517b and the second extending portion 1517c may be fixed to the bushing body 1517a by welding with separate components, or one of the first extending portion 1517b and the second extending portion 1517c may be integrally processed. The other uses separate parts for soldering, and those skilled in the art will appreciate that these alternative techniques are equally capable of achieving the objectives of the present invention in light of the teachings of the present embodiments.

At the same time, further structural changes can be made to the piston plate or the piston pad. For example, a pressing step 1515a is provided at a portion of the piston pressing piece 1515 that is in contact with the second extending portion 1517c, so that the second extending portion 1517c and The pressing step 1515a abuts; or a spacer step 1513a is provided at a portion of the piston spacer 1513 that is in contact with the first extending portion 1517b, so that the first extending portion 1517b abuts against the spacer step 1513a, as shown in FIG. .

It should be noted that the pressing step 1515a and the spacer step 1513a may be provided alternatively or at the same time.

The first piston 151 further includes a fixing base 1511. The fixing base 1511 is fixedly connected to the piston spacer 1513. The fixing base 1511 has a fixing base connecting portion 1511a fixedly connected to the piston spacer 1513, and can be fixed by welding or riveting. Or use screws to fix. The fixing base 1511 further includes a fixing seat body portion 1511b. The cone plug 1512 is partially disposed inside the fixing seat body portion 1511b, and partially protrudes from the fixing seat 1511 for when the first piston 151 is moved to the first working position, The first flow guiding portion 2113 abuts and blocks the first guiding channel 2116. A tapered plug spring 1516 is also provided inside the bushing 1517 to provide a cushioning action for the taper plug 1512. Thus, the taper plug can be displaced in the axial direction along the center of the fixing seat 1511, but cannot be completely disengaged from the fixing seat 1511. This type of structure can greatly reduce the stress of the taper when the electromagnetic switching valve is operated, avoiding deformation and failure, and is suitable for a high temperature and high pressure refrigerant system.

After the first piston 151 is manufactured, the first piston is fixedly coupled to one end of the connecting rod 14 by screwing. Specifically, the piston pressing piece of the first piston 151 is abutted against the first connecting portion 141 of the connecting rod, and then screwed into the first threaded portion provided on the first connecting portion 141 by using a screw, thereby connecting the first piston 151 and the connecting body The rod 14 is fixed as a whole.

The structure of the first piston 151 is described above as an example. The second piston 152 can adopt the same structure as the first piston 151. Those skilled in the art can also understand the second piston 152 based on the above disclosure. The structure and the second piston 152 are fixed to the second connecting portion 142 of the connecting rod.

It should be noted that the embodiment of the piston 15 (including the first piston 151 and the second piston 152) is not limited to the electromagnetic switching valve described in the first embodiment of the present invention, and those skilled in the art should understand that the connecting rod The combined structure with the piston is an integral alternative to the main valve body. The piston structure provided in the embodiment can be applied to a high-pressure and vibration environment with a relatively harsh working condition, and can naturally be applied to work. In a more favorable environment. That is to say, the above-mentioned piston structure can also be applied to ordinary electromagnetic four-way valve products in the field of household air conditioners, such as the technical solutions described in the background art.

Please refer to FIG. 7. FIG. 7 is a schematic structural diagram of an electromagnetic switching valve according to another embodiment of the present invention.

In the description of the present embodiment, for the components having the same reference numerals, the description of the other embodiments above may be referred to, and the detailed description is not repeated here, and only the differences will be described.

The main valve body 11 is internally formed with a main valve chamber 111, and a first flow passage 101, a second flow passage 102, a third flow passage 103, and a fourth flow passage 104; a second flow passage 102, a third flow passage 103, and a fourth The flow passages 104 are on the same side, and the first flow passages 101 are on the opposite side. The first flow path 101 can communicate with a high pressure side of the refrigeration system (ie, an exhaust port of the compressor), and the third flow path 103 communicates with a low pressure side of the refrigeration system (ie, a side of the suction port of the compressor). Thus, the refrigerant at the first flow path 101 is always maintained at a high temperature and a high pressure while the refrigerant at the third flow path 103 is always maintained at a relatively low temperature and a low pressure.

The main valve body 11 is formed of a metal material and directly forms four flow passages or is processed to form four flow passages. Compared with the background art, the valve body and the nozzle are not required to be welded, thereby reducing the high pressure and vibration of the welded portion. The hidden dangers of the impact, the overall structural strength is higher, and the work is more reliable.

The main valve chamber 111 is provided with a main valve seat 12 fixedly coupled to the main valve body 11, a slider 13 slidable on the main valve seat 12, and a connecting rod 14 for driving the slider 13 to be fixed at both ends of the connecting rod 14. The first piston 151 and the second piston 152.

The first pilot valve 21 includes a first flow guiding portion 2113, and the second pilot valve 31 includes a second flow guiding portion 3113. The first flow guiding portion 2113 may be integrally formed or formed by using a metal material such as stainless steel, and is provided with a first valve port 2115, and a first guiding channel 2116 and a second guiding channel disposed inside the first guiding portion 2113. 2117. The second flow guiding portion 3113 may also be integrally formed or formed by using a metal material such as stainless steel, and is provided with a second valve port 3115, and a third guiding channel 3116 and a fourth guiding flow disposed inside the second guiding portion 3113. Channel 3117.

The internal structures of the first pilot valve 21 and the second pilot valve 31 can be understood by referring to the description of other embodiments above, and are not described herein again.

The main valve body 11 is machined or forged by a metal such as stainless steel or aluminum material, and the main valve body 11 may be an integral structure, and a first main valve flow guiding passage 112 and a second main valve are also opened therein. The flow guiding channel 113, the first main valve guiding channel 112 and the second main valve guiding channel 113 can be combined by two or more straight channels formed by drilling or the like.

Wherein, one end of the first main valve guiding passage 112 communicates with the first guiding passage 2116 on the first guiding portion 2113, and the other end communicates with the third flow passage 103 on the main valve body 11. Similarly, one end of the second main valve flow guiding passage 113 communicates with the fourth flow guiding passage 3117 on the second flow guiding portion 2113, and the other end communicates with the third flow passage 103 on the main valve body 11.

The first flow guiding portion 2113 and the main valve body 11 can be fixed by press fitting and welding. In the manufacturing process, the first guiding channel 2116 and the second guiding channel 2117 are first processed on the first guiding portion 2113. Then, the first flow guiding portion 2113 is fitted into one end of the main valve body, and one end of the first flow guiding passage 2116 is aligned and communicated with the first main valve guiding passage 112 of the main valve body, and then welding fixing is performed. Similarly, the second flow guiding portion 3113 and the main valve body 11 can also be fixed by press fitting and welding. At the time of manufacture, the third guiding channel 3116 and the fourth guiding are first processed on the second guiding portion 3113. The flow passage 3117 then loads the second flow guiding portion 3113 into the other end of the main valve body, and aligns and connects one end of the fourth flow guiding passage 3117 with the second main valve guiding passage 113 of the main valve body, and then implements Solder fixed.

Since the first main valve guiding passage 112 and the second main valve guiding passage 113 are disposed on the main valve body, it is no longer necessary to provide a connecting pipe outside the main valve body, so that the structure of the entire product is more compact, and the connecting pipe is reduced. The risk of failure of the welded part under high pressure and vibration working conditions.

The working principle of the electromagnetic switching valve provided by the above embodiment is briefly described as follows:

1. The first coil 212 is energized and the second coil 312 is not energized.

The second coil 312 is not energized, and no electromagnetic force is generated. At this time, the second moving iron core 3112 drives the second sealing portion 3114 to block the second valve opening 3115 under the elastic force of the second return spring 3118, so that the third guiding current is made. The passage 3116 and the fourth flow guiding passage 3117 are in a cut-off state.

The first coil 212 is energized to generate an electromagnetic force, so that the first moving iron core 2112 overcomes the elastic force of the first return spring 2118, and is sucked with the first static iron core 2111, thereby driving the first blocking portion 2114 away from the first valve port 2115. At this time, the first guiding channel 2116 and the second guiding channel 2117 are in a connected state. Since the second flow guiding passage 2117 is in communication with the third flow passage 103 through the first connecting pipe 22, and the third flow passage 103 is in communication with the suction port of the compressor, the inner cavity of the first pilot valve is In the low pressure state, in the case where the first cavity 1111 is in communication with the inner cavity of the first pilot valve, the first cavity 1111 is also in a low pressure state, and the second cavity 1112 is in communication with the first flow channel 101, the first flow path 101 is in communication with the exhaust port of the compressor, so that the second cavity 1112 is in a high pressure state, and under the action of the differential pressure, the first piston 151 is pushed to move to the left side of the figure until the taper of the first piston 151 The second flow guiding channel 2117 is abutted against the first flow guiding portion 2113, thereby driving the slider 13 to move and covering the first through hole 121 of the valve seat. At this time, the first flow path 101 communicates with the fourth flow path 103 through the second cavity 1112. The electromagnetic switching valve is in the first working state.

At this time, the flow of the refrigerant inside the electromagnetic switching valve is such that the high-temperature high-pressure refrigerant discharged from the compressor enters the second cavity 1112 through the first flow path 101, and then flows out from the fourth flow path 104.

2. The first coil 212 is not energized and the second coil 312 is energized.

The first coil 212 is not energized, and no electromagnetic force is generated. At this time, the first moving iron core 2112 drives the first plugging portion 2114 to block the first valve port 2115 under the elastic force of the first return spring 2118, so that the first guiding current is made. The passage 2116 and the second flow guiding passage 2117 are in a cut-off state.

The second coil 312 is energized to generate an electromagnetic force, so that the second moving iron core 3112 overcomes the elastic force of the second return spring 3118, and is attracted to the second static iron core 3111, thereby driving the second blocking portion 3114 away from the second valve port 3115. At this time, the third guiding channel 3116 and the fourth guiding channel 3117 are in a connected state. Since the fourth flow guiding passage 3117 is in communication with the third flow passage 103 through the second connecting pipe 32, and the third flow passage 103 is in communication with the suction port of the compressor, it is connected through the third guiding passage 3116. The third cavity 1113 of the inner cavity of the second pilot valve is also in a low pressure state, and the second cavity 1112 is in communication with the first flow channel 101, and the first flow channel 101 is in communication with the exhaust port of the compressor, and thus the second cavity The body 1112 is in a high pressure state, and under the action of the differential pressure, the piston is pushed and the slider 13 is moved to the right side of the figure until the taper of the second piston 152 abuts the second flow guiding portion 3113 and blocks the third. The flow guiding channel 3116, at this time, the slider concave portion cooperates with the main valve seat to form a cavity that can be used for conduction while communicating with the third flow channel 103 and the fourth flow channel 104, so that the third flow channel 103 and the fourth flow channel 104 is connected while the first flow path 101 communicates with the second flow path 102 through the second cavity 1112. The electromagnetic switching valve is in the second working state.

At this time, the flow direction of the refrigerant is: the high temperature and high pressure refrigerant discharged from the compressor enters the second cavity 1112 through the first flow path 101, then flows out from the second flow path 102, and passes through the throttle valve and the heat exchanger and then from the third flow path 103. It flows into the electromagnetic switching valve and flows out of the fourth flow path 104 back to the compressor to form a cycle.

The flow direction of the refrigerant during operation of the electromagnetic switching valve is described above in a specific embodiment, which is different from the flow direction of the refrigerant described in the background art, and is suitable for the refrigerant flow direction requirement of the on-vehicle refrigeration system. Of course, those skilled in the art can also open the positions of the second flow channel 102, the third flow channel 103, and the fourth flow channel 104 without any creative work under the technical suggestion given in this embodiment. Resetting, and moving the slider 13 to the first working position on the left side, turning on the second flow path 102 and the third flow path 103, when the slider 13 is moved to the right side, in the second working position, The third flow path 103 and the fourth flow path 104 are turned on, thereby forming a new embodiment. The working principle of the electromagnetic switching valve of the new embodiment is as follows:

1. The first coil 212 is energized and the second coil 312 is not energized.

The second coil 312 is not energized, and no electromagnetic force is generated. At this time, the second moving iron core 3112 drives the second sealing portion 3114 to block the second valve opening 3115 under the elastic force of the second return spring 3118, so that the third guiding current is made. The passage 3116 and the fourth flow guiding passage 3117 are in a cut-off state.

The first coil 212 is energized to generate an electromagnetic force, so that the first moving iron core 2112 overcomes the elastic force of the first return spring 2118, and is sucked with the first static iron core 2111, thereby driving the first blocking portion 2114 away from the first valve port 2115. At this time, the first guiding channel 2116 and the second guiding channel 2117 are in a connected state. Since the second flow guiding passage 2117 is in communication with the third flow passage 103 through the first connecting pipe 22, and the third flow passage 103 is in communication with the suction port of the compressor, the inner cavity of the first pilot valve is In the low pressure state, in the case where the first cavity 1111 is in communication with the inner cavity of the first pilot valve, the first cavity 1111 is also in a low pressure state, and the second cavity 1112 is in communication with the first flow channel 101, the first flow path The 101 is in communication with the exhaust port of the compressor, so that the second cavity 1112 is in a high pressure state, and under the action of the differential pressure, the first piston 151 is pushed to the left until the taper of the first piston 151 is first. The flow guiding portion 2113 abuts and blocks the second guiding channel 2117, thereby driving the slider 13 to move to the left, and the slider concave portion cooperates with the main valve seat to form a cavity that can be used for conduction, the second flow path 102 and the third The flow path 103 is turned on. At this time, the first flow path 101 communicates with the fourth flow path 103 through the second cavity 1112.

At this time, the flow direction of the refrigerant is: the high temperature and high pressure refrigerant discharged from the compressor enters the second cavity 1112 through the first flow path 101, then flows out from the fourth flow path 104, and passes through the throttle valve and the heat exchanger and then from the third flow path 103. It flows into the electromagnetic switching valve and flows out of the second flow path 102 back to the compressor to form a cycle.

2. The first coil 212 is not energized and the second coil 312 is energized.

The first coil 212 is not energized, and no electromagnetic force is generated. At this time, the first moving iron core 2112 drives the first plugging portion 2114 to block the first valve port 2115 under the elastic force of the first return spring 2118, so that the first guiding current is made. The passage 2116 and the second flow guiding passage 2117 are in a cut-off state.

The second coil 312 is energized to generate an electromagnetic force, so that the second moving iron core 3112 overcomes the elastic force of the second return spring 3118, and is attracted to the second static iron core 3111, thereby driving the second blocking portion 3114 away from the second valve port 3115. At this time, the third guiding channel 3116 and the fourth guiding channel 3117 are in a connected state. Since the fourth flow guiding passage 3117 is in communication with the third flow passage 103 through the second connecting pipe 32, and the third flow passage 103 is in communication with the suction port of the compressor, it is connected through the third guiding passage 3116. The third cavity 1113 of the inner cavity of the second pilot valve is also in a low pressure state, and the second cavity 1112 is in communication with the first flow channel 101, and the first flow channel 101 is in communication with the exhaust port of the compressor, and thus the second cavity The body 1112 is in a high pressure state, and under the action of the differential pressure force, the piston is pushed and the slider 13 is moved to the right side until the taper of the second piston 152 abuts against the second flow guiding portion 3113 and blocks the third guiding channel. 3116, at this time, the slider concave portion cooperates with the main valve seat to form a cavity that can be used for conduction, and communicates with the third flow channel 103 and the fourth flow channel 104, so that the third flow channel 103 communicates with the fourth flow channel 104. At the same time, the first flow path 101 communicates with the second flow path 102 through the second cavity 1112. The electromagnetic switching valve is in the second working state.

At this time, the flow direction of the refrigerant is: the high temperature and high pressure refrigerant discharged from the compressor enters the second cavity 1112 through the first flow path 101, then flows out from the second flow path 102, and passes through the throttle valve and the heat exchanger and then from the third flow path 103. It flows into the electromagnetic switching valve and flows out of the fourth flow path 104 back to the compressor to form a cycle.

The refrigerant flow switching process of the electromagnetic switching valve of this new embodiment is similar to that described in the background art. "Connected" as used in the specification and claims refers to physical communication, that is, the flow of refrigerant is allowed to flow through the passage or under certain conditions, even if a certain connected passage is temporarily cut off (for example, When the blocking portion 2114 blocks the first valve port 2115, it does not affect the first communication channel 2116 and the second guiding channel 2117 through the first valve port 2115 to establish the "connection" described in the present specification; It is not considered to be "disconnected" in the case where it is impossible to pass the refrigerant between the two spaces or the flow passages.

Here, the orientation words up, down, left, and right are defined on the basis of the views shown in the drawings of the specification, and are merely for convenience of understanding and expression, and the scope of protection of the present application should not be limited.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims (9)

An electromagnetic switching valve, comprising: a main valve and a pilot valve, the pilot valve comprising a first pilot valve (21) and a second pilot valve (31); The first pilot valve (21) includes a first valve body (211) and a first coil (212) that cooperates with the first valve body (211), and the second pilot valve includes a second valve body ( 311) and a second coil (312) that cooperates with the second valve body (311), the first valve body (211) includes a first flow guiding portion (2113), and the second valve body (311) ) including a second flow guiding portion (3113); The main valve includes a main valve body (11) including a first flow passage (101), a second flow passage (102), a third flow passage (103), and a fourth flow passage (104). The first flow guiding portion (2113) and the second flow guiding portion (3113) are fixedly connected to the main valve body (111), respectively; The first flow guiding portion (2113) includes a first valve port portion, a first flow guiding channel (2116) and a second flow guiding channel (2117), the first valve port portion including a first valve port (2115) One end of the first flow guiding channel (2116) is in communication with the first valve port (2115), and the other end of the first guiding channel (2116) is in communication with the third flow channel (103); The second flow guiding portion (3113) includes a second valve port portion, a third flow guiding channel (3116) and a fourth guiding channel (3117), and the second valve port portion includes a second valve port (3115) One end of the fourth guiding channel (3117) is in communication with the second valve port (3115), and the other end of the fourth guiding channel (3117) is in communication with the third channel (103). The electromagnetic switching valve according to claim 1, wherein said main valve body (11) is formed of a metal material, and a main valve body (11) is disposed in said main valve body (11). The main valve chamber (111) is provided with a connecting rod (14) and a first piston (151) and a second piston (152) respectively fixed at two ends of the connecting rod (14), and the first cavity (1111) is formed in Between the first flow guiding portion (2113) and the first piston (151), a second cavity (1112) is formed between the first piston (151) and the second piston (152) A third cavity (1113) is formed between the second piston (152) and the second flow guiding portion (3113). The electromagnetic switching valve according to claim 1, wherein said first flow guiding passage (2116) and said third flow passage (103) communicate with each other through a first connecting pipe (22), The fourth flow guiding channel (3117) communicates with the third flow channel (103) through the second connecting pipe (32). The electromagnetic switching valve according to claim 3, wherein said first flow guiding portion (2113) is fixed to said main valve body (11) by press fitting and welding, said second guiding The flow portion (3113) and the main valve body (11) are fixed by press fitting and welding. The electromagnetic switching valve according to claim 2, wherein said main valve body (11) is fixedly coupled to a main valve seat (12), said main valve seat (12) being provided with a flat portion (124) and penetrating a first through hole (121), a second through hole (122), a third through hole (123) of the flat portion (124), the first through hole (121) and the second flow path (102) In communication, the second through hole (122) is in communication with the third flow path (103), and the third through hole (123) is in communication with the fourth flow path (104). The electromagnetic switching valve according to claim 5, further comprising a slider (13), said slider (13) being displaced with displacement of said link (14) and capable of being along said flat portion (124) sliding, the slider (13) has two working positions: In the first working position, the slider (13) blocks the second flow path (102), and connects the fourth flow path (104) with the second cavity (1112); In the second working position, the slider (13) conducts the third flow path (103) and the fourth flow path (104), and causes the second flow path (102) to The second cavity (1112) is in communication. The electromagnetic switching valve according to claim 5, further comprising a slider (13), said slider (13) being displaced with displacement of said link (14) and capable of being along said flat portion (124) sliding, the slider (13) has two working positions: In the first working position, the slider (13) conducts the second flow path (102) and the third flow path (103), and causes the fourth flow path (104) to The second cavity (1112) is in communication; In the second working position, the slider (13) conducts the third flow path (103) and the fourth flow path (104), and causes the second flow path (102) to The second cavity (1112) is in communication. The electromagnetic switching valve according to claim 1, wherein the first valve body (211) further comprises a first static iron core (2111), a first moving iron core (2112), and the first moving iron a first blocking portion (2114) is fixedly connected to the core (2112), and a first return spring (2118) is disposed between the first static iron core (2111) and the first moving iron core (2112). When the first coil (212) is not energized, the first plugging portion (2114) blocks the first valve port (2115). The electromagnetic switching valve according to claim 1, wherein the second valve body (311) further comprises a second static iron core (3111), a second moving iron core (3112), and the second moving iron The core (3112) is fixedly connected with a second blocking portion (3114), and a second return spring (3118) is disposed between the second static iron core (3111) and the second moving iron core (3112). When the second coil (312) is not energized, the second plugging portion (3114) blocks the second valve port (3115).

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