CN109990113B - Electromagnetic switching valve and piston - Google Patents
Electromagnetic switching valve and piston Download PDFInfo
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- CN109990113B CN109990113B CN201711471365.2A CN201711471365A CN109990113B CN 109990113 B CN109990113 B CN 109990113B CN 201711471365 A CN201711471365 A CN 201711471365A CN 109990113 B CN109990113 B CN 109990113B
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- main valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/048—Electromagnetically actuated valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
Abstract
The invention discloses a piston for an electromagnetic switching valve, which is characterized by comprising a first piston fixedly connected with a first connecting part of a connecting rod and a second piston fixedly connected with a second connecting part of the connecting rod; the first piston comprises a piston gasket, a piston pressing plate, a piston bowl and a piston spring piece, wherein the piston bowl and the piston spring piece are arranged between the piston gasket and the piston pressing plate; the piston gasket, the piston pressing sheet, the piston bowl and the piston spring piece are all provided with middle through holes; the piston gasket further comprises a bushing, wherein the bushing penetrates through the middle through hole and is fixedly connected with the piston gasket and the piston pressing sheet. The piston provided by the invention can greatly reduce the stress of the conical plug when the electromagnetic switching valve works, avoids deformation and poor failure, and is suitable for a high-temperature and high-pressure refrigerant system. The electromagnetic switching valve provided by the invention adopts the piston, so the technical effects are also achieved.
Description
Technical Field
The invention relates to the field of refrigeration control, in particular to an electromagnetic switching valve.
Background
Referring to fig. 1, fig. 1 is a schematic structural diagram of a typical electromagnetic four-way valve in the background art.
As shown, a conventional four-way solenoid valve, which is generally used in a refrigeration system such as an air conditioning system, includes a main valve 10 'and a pilot valve 20'; the main valve 10' includes a valve body 11', the valve body 11' having a discharge pipe D connected to a discharge port of the compressor (connected to a high pressure region), a suction pipe S connected to a suction port of the compressor (connected to a low pressure region), a connection pipe E connected to the indoor heat exchanger 30' and a connection pipe C connected to the outdoor heat exchanger 40 '; the two ends of the valve body 11' are provided with end covers 12', the interior of the valve body is fixedly provided with a valve seat 13', the valve seat 13' is also provided with a slide block 15' and a piston 16' which are driven by a connecting rod 14', the valve seat 13' contacts and supports the slide block 15' to form a pair of kinematic pairs, and the piston 16' and the valve body 11' form a pair of kinematic pairs.
The small valve body of the pilot valve 20' is fixedly provided with a capillary tube D connected with the exhaust pipe D of the main valve 10', namely, the inner cavity of the pilot valve 20' is correspondingly communicated with the high-pressure area of the main valve; the small valve seat of the pilot valve 20' has three valve ports, and is fixedly provided with a capillary tube e, a capillary tube S and a capillary tube c which are connected with the left end cover and the air suction pipe S of the main valve 10' and the right end cover of the main valve 10' respectively from left to right; the right end of the small valve body of the pilot valve 20 'is fixedly provided 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 refrigerate, the electromagnetic coil 50 'is not energized, the core iron in the cavity of the pilot valve 20' drives the sliding bowl to be located at the left side under the action of the restoring spring force, so that the capillary E is communicated with the capillary S, the capillary C is communicated with the capillary D, the left cavity of the main valve 10 'is a low-pressure area, the right cavity is a high-pressure area, a pressure difference is formed between the left cavity and the right cavity of the main valve 10', the sliding block 15 'and the piston 16' are pushed to the left side, the connecting pipe E is communicated with the suction pipe S, the exhaust pipe D is communicated with the connecting pipe C, and at this time, the flow path of a refrigerant in the refrigeration system is: compressor discharge port → discharge pipe D → valve cavity of valve body 11 → connection pipe C → outdoor heat exchanger 40'→ throttling element 60' → indoor heat exchanger 30'→ connection pipe E → slide block 15' inner cavity → suction pipe S → compressor suction port, the refrigeration system is in the refrigeration working state;
When the refrigeration system needs to heat, the electromagnetic coil 50 'is powered on, the core iron in the cavity of the pilot valve 20' overcomes the acting force of the return spring to drive the sliding bowl to move right, so that the capillary C is communicated with the capillary S, the capillary E is communicated with the capillary D, the left cavity of the main valve 10 'is a high-pressure area, the right cavity is a low-pressure area, a pressure difference is formed between the left cavity and the right cavity of the main valve 10', the sliding block 15 'and the piston 16' are pushed to the right side, the connecting pipe C is communicated with the suction pipe S, the exhaust pipe D is communicated with the connecting pipe E, and at the moment, the flow path of a refrigerant in the refrigeration system is as follows: compressor discharge port → discharge pipe D → valve cavity of valve body 11 → connection pipe E → indoor heat exchanger 30'→ throttling element 60' → outdoor heat exchanger 40'→ connection pipe C → inner cavity of slide block 15' → suction pipe S → compressor suction port, and the refrigeration system is in a heating operation state.
As described above, the main valve 10' can be switched by the cooperation of the pilot valve 20' and the solenoid 50', etc., so that the flow direction of the refrigerant can be switched, and the heating operation state and the cooling operation state of the refrigeration system can be switched.
The electromagnetic four-way valve is suitable for a refrigerating system of a household air conditioner, but along with the development of the technology, the application field of the electromagnetic switching valve is continuously expanded, for example, in the field of an automobile air conditioner, the electromagnetic switching valve is also required to be used for switching the flow direction of a refrigerant, particularly a carbon dioxide refrigerant commonly used by the automobile air conditioner, the use condition is different from that of a common household air conditioner, if the electromagnetic four-way valve is directly applied to the automobile air conditioner, the corresponding working condition cannot be met, and meanwhile, the higher requirement on the strength of a piston is also provided by the high-temperature and high-pressure working environment.
Therefore, a technical problem to be solved by those skilled in the art is how to design an electromagnetic switching valve with a high-strength piston to be suitable for an automotive air conditioning system with a high-temperature and high-pressure refrigerant.
Disclosure of Invention
The invention aims to provide a piston of an automobile air conditioning system suitable for high-temperature and high-pressure refrigerants, and provides an electromagnetic switching valve applying the piston on the basis of the piston, so that the invention adopts the following technical scheme:
a piston is used for an electromagnetic switching valve and is characterized by comprising a first piston fixedly connected with a first connecting part of a connecting rod and a second piston fixedly connected with a second connecting part of the connecting rod;
the first piston comprises a piston gasket, a piston pressing plate, a piston bowl and a piston spring piece, wherein the piston bowl and the piston spring piece are arranged between the piston gasket and the piston pressing plate; the piston gasket, the piston pressing sheet, the piston bowl and the piston spring piece are all provided with middle through holes;
the piston gasket further comprises a bushing, wherein the bushing penetrates through the middle through hole and is fixedly connected with the piston gasket and the piston pressing sheet.
On the basis of the technical scheme, partial technical characteristics can be further improved or refined, so that the following technical scheme is formed, and the following technical characteristics can be applied independently or in combination:
The bushing comprises a bushing body, a first extending portion and a second extending portion, wherein the first extending portion and the second extending portion are located at two ends of the bushing body respectively, the first extending portion is abutted to the piston gasket, and the second extending portion is abutted to the piston pressing sheet.
The bushing body, the first extension portion and the second extension portion are made of an integral material, and two ends of the bushing body are respectively bent in a compression joint mode to form the first extension portion and the second extension portion.
The first extension portion and/or the second extension portion are/is a separate component and fixed to the bushing body by welding.
The piston pressing sheet is provided with pressing sheet steps, and the second extending portion is abutted to the pressing sheet steps.
The piston gasket is provided with a gasket step, and the first extending part is abutted against the gasket step.
The first piston further comprises a fixed seat, the fixed seat comprises a fixed seat body part, a conical plug part is arranged in the fixed seat body part, and when the first piston is located at a first working position, the conical plug is abutted to the first flow guide part and blocks the first flow guide channel.
The first piston is fixedly connected with the first connecting part through a screw, and the second piston is fixedly connected with the second connecting part through a screw.
The first piston and the second piston have the same structure.
On the basis of the piston structure, the invention also provides an electromagnetic switching valve which comprises a main valve and a pilot valve, wherein the pilot valve comprises a first pilot valve and a second pilot valve;
the first pilot valve comprises a first valve body and a first coil which are matched with each other, the second pilot valve comprises a second valve body and a second coil which are matched with each other, the first valve body comprises a first flow guide part, and the second valve body comprises a second flow guide part;
the main valve comprises a main valve body, the main valve body comprises a first flow passage, a second flow passage, a third flow passage and a fourth flow passage, and the first flow guiding part and the second flow guiding part are respectively fixed at two ends of the main valve body;
the main valve body is internally provided with a connecting rod and the piston.
The structure mode can greatly reduce the stress of the conical plug when the electromagnetic switching valve works, avoids deformation and failure, and is suitable for a high-temperature and high-pressure refrigerant system. The electromagnetic switching valve provided by the invention adopts the piston, so the technical effects are also achieved.
Drawings
FIG. 1 is a schematic diagram of a typical solenoid four-way valve of the prior art;
Fig. 2 is a schematic structural diagram of a first working state of the electromagnetic switching valve according to the first embodiment of the present invention;
fig. 3 is a structural schematic diagram of a second working state of the electromagnetic switching valve according to the first embodiment of the present invention;
fig. 4 is an external schematic view of an electromagnetic switching valve according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a connecting rod assembly provided in accordance with another embodiment of the present invention;
FIG. 6 is a schematic 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 Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the following detailed description is made with reference to the accompanying drawings and the detailed description.
Referring to fig. 2, fig. 3 and fig. 4, fig. 2 is a structural diagram of a first working state of the electromagnetic switching valve according to the first embodiment of the present invention, fig. 3 is a structural diagram of a second working state of the electromagnetic switching valve according to the first embodiment of the present invention, and fig. 4 is an external view of the electromagnetic switching valve according to the 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, the main valve body 11 may be formed by casting or forging a metal such as stainless steel, and the main valve body 11 may be an integral structure and fixed to the pilot valve, so as to form a main valve cavity 111 inside the main valve body. And a first flow passage 101, a second flow passage 102, a third flow passage 103 and a fourth flow passage 104 extend along the main valve chamber 111 to the outside of the main valve body. The second flow channel 102, the third flow channel 103 and the fourth flow channel 104 are located on the same side, and the first flow channel 101 is located on the opposite side. The first flow channel 101 may be communicated with a high pressure side (i.e., a discharge port of the compressor) of the refrigeration system, and the third flow channel 103 may be communicated with a low pressure side (i.e., a suction port of the compressor) of the refrigeration system, so that the refrigerant in the first flow channel 101 is always kept at a high temperature and a high pressure, and the refrigerant in the third flow channel 103 is always kept at a relatively low temperature and a low pressure during operation.
Compared with the prior art, the main valve body 11 is formed by adopting a metal material and directly forms four flow passages or is processed to form four flow passages, the welding mode of the valve body and the connecting pipe is not needed, the failure hidden danger caused by the influence of factors such as high pressure, vibration and the like on the welding position is reduced, the integral structural strength is higher, and the work is more reliable.
The main valve chamber 111 is provided with a main valve seat 12 fixedly connected to the main valve body 11, the main valve seat 12 is correspondingly provided with a first through hole 121, a second through hole 122, and a third through hole 123, the main valve seat 12 has a flat portion 124 for the slider to slide, and the first through hole 121, the second through hole 122, and the third through hole 123 all penetrate the flat portion 124 and are respectively communicated with the second flow passage 102, the third flow passage 103, and the fourth flow passage 104. The first through hole 121, the second through hole 122 and the third through hole 123 may be straight through holes, stepped through holes with different diameters in cross section, or through holes with irregular shapes, and only need to be able to communicate each corresponding part of the main valve cavity 111 with the second flow passage 102, the third flow passage 103 and the fourth flow passage 104, respectively.
The main valve cavity 111 is provided with a slider 13, a connecting rod 14 and two pistons 15, wherein the slider 13 comprises a plane portion for being attached to the flat portion 124 of the main valve seat and capable of sliding relatively along the flat portion 124 in a corresponding range under the driving of the connecting rod 14, the piston has two working positions, the slider 13 further comprises a concave portion recessed inwards from the plane portion, the concave portion is matched with the main valve seat to form a cavity capable of being used for conducting, and as shown in fig. 3, the third flow passage 103 and the fourth flow passage 104 can be communicated through the cavity formed by the slider 13 and the main valve seat. As shown in fig. 2, when the slider 13 is located at the left position (first operating position), it is possible to make the second flow passage 102 not communicate with the main valve chamber 111 and make the second flow passage 102 not communicate with the chamber formed by the slider 13 and the main valve seat 12; the fourth flow path 104 is now in communication with the main valve chamber 111 and indirectly also with the first flow path 101, which is defined as the first operating position. When the slider 13 slides to the right, the third flow passage 103 and the fourth flow passage 104 can be connected, and the first flow passage 101 and the second flow passage 102 can be connected through the main valve chamber 111. This time defined as the second operating position. The connecting rod 14 is fixedly connected with pistons 15 at two ends of the connecting rod 14, the pistons 15 comprise a first piston 151 located on the left side of the main valve cavity 111 and a second piston 152 located on the right side of the main valve cavity, and the main valve cavity 111 is divided into three relatively independent spaces by the first piston 151 and the second piston 152.
A first pilot valve 21 and a second pilot valve 31 are attached to both sides of the main valve body 11 in the central axis direction of the main valve chamber 111, respectively, and the first pilot valve 21 and the second pilot valve 31 may have the same configuration.
The first pilot valve 21 comprises a first valve body 211 and a first coil 212, the first valve body 211 comprises a first stationary iron core 2111, a first movable iron core 2112 and a first flow guiding portion 2113, the first movable iron core 2112 is connected with a first blocking portion 2114, a first return spring 2118 is arranged between the first movable iron core 2112 and the first stationary iron core 2111, the first stationary iron core 2111 is fixedly connected with a first sleeve 2119, the first movable iron core 2112 can slide in the first sleeve 2119, and when the first sleeve 2119 and the first flow guiding portion 2113 are fixed, a first pilot valve cavity 2119a is formed between the first sleeve 2119 and the first flow guiding portion 2113; when the first plunger 2112 is actuated, the first closing portion 2114 is moved, and when the first coil 212 is not energized, the first closing portion 2114 closes the first valve port portion 2115 of the first flow guide 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 stationary core 3111, a second movable core 3112 and a second flow guiding portion 3113, the second movable core 3112 is connected to a second plugging portion 3114, a second return spring 3118 is disposed between the second movable core 3112 and the second stationary core 3111, the second stationary core 3111 is fixedly connected to the second sleeve 3119, the second movable core 3112 is slidable in the second sleeve 3119, and when the second sleeve 3119 and the second flow guiding portion 3113 are fixed, a second pilot valve cavity 3119a is formed between the second stationary core 3111 and the second sleeve 3119; when the second plunger 3112 is operated, the second sealing portion 3114 is moved, and when the second coil 312 is not energized, the second sealing portion 3114 seals the second valve port portion 3115 of the second flow guide portion 3113.
The first flow guide 2113 and the second flow guide 3113 are fixedly and hermetically connected to two sides of the main valve body 11, for example, by welding, so that the main valve cavity 111 is divided into three parts by the first piston 151 and the second piston 152: a first cavity 1111 is formed between the first guide 2113 and the first piston 151, a second cavity 1112 is formed between the first piston 151 and the second piston 152, and a third cavity 1113 is formed between the second piston 152 and the second guide 3113. It should be noted that the size of the space between the first chamber 1111 and the third chamber 1113 changes with the relative movement of the piston 15.
The first flow guiding portion 2113 may be formed by a metal material such as stainless steel, and is integrally formed or machined, and is provided with a first valve port 2115, a first flow guiding channel 2116 and a second flow guiding channel 2117 which are arranged inside the first flow guiding portion 2113, the first flow guiding channel 2116 and the second flow guiding channel 2117 are communicated through a first pilot valve cavity 2119a and the first valve port 2115, one end of the second flow guiding channel 2117 is communicated with the first pilot valve cavity 2119a, and the other end of the second flow guiding channel 2117 is communicated with the first cavity 1111 when the electromagnetic switching valve is in the second working position. In a specific process, the first flow guide passage 2116 and the second flow guide passage 2117 may be formed by drilling or the like. In the present embodiment, the first flow guide passage 2116 communicates with the third flow passage 103 through the first connection pipe 22, the other end of the first flow guide passage 2116 communicates with the first valve port 2115, and the first connection pipe 22 may be located outside the main valve body 11.
It should be noted that, both the first flow guide channel 2116 and the second flow guide channel 2117 may be formed on the body of the first flow guide portion 2113, and the present invention does not limit the specific orientation of the channels, the forming mode of the channels, or the combination mode of multiple channels, and only the following conditions need to be satisfied: one end of the second fluid guide channel 2117 is communicated with the first cavity 1111 when the electromagnetic switching valve is in the second working state. The first flow guide passage 2116 and the second flow guide passage 2117 may be formed by combining more than two straight passages, and the straight passages may be formed by drilling.
Thus, when the first plunger 2112 brings the first blocking portion 2114 into contact with the first valve port portion 2115 to block the first valve port portion 2115, the first flow channel 2116 and the second flow channel 2117 are in a blocked state.
The second flow guide portion 3113 may be formed integrally or by machining, and is provided with a second valve port portion 3115, a third flow guide channel 3116 and a fourth flow guide channel 3117 arranged inside the second flow guide portion 3113, and the third flow guide channel 3116 and the fourth flow guide channel 3117 are communicated through the second valve port portion 3115 and the second guide valve cavity 3119 a. In a specific process, the third flow guide passage 3116 and the fourth flow guide passage 3117 may be formed by drilling or the like. In this embodiment, the fourth guide passage 3117 and the third flow passage 103 are communicated with each other through the second connection pipe 32, the other end of the fourth guide passage 3117 is communicated with the second valve port portion 3115, and the second connection pipe 32 may be located outside the main valve body 11. One end of the third pilot passage 3116 communicates with the second pilot valve chamber 3119a, and the other end of the third pilot passage 3116 communicates with the third chamber 1113 in the first operating condition.
In this specification, the prefixes of "first, second, third, and fourth" in the names of the components are only naming modes introduced for convenience of distinguishing different components, and there is no specific order, for example, the second flow guide portion 3113 is provided with the third flow guide channel 3116 and the fourth flow guide channel, and it does not mean that the second flow guide portion 3113 is necessarily provided with the first flow guide channel or the second flow guide channel at the same time.
It should be noted that, both the third flow guide channel 3116 and the fourth flow guide channel 3117 may be formed on the body of the second flow guide portion 3113, and the specific orientation of the channels, the forming mode of the channels, or the combination mode of multiple channels are not limited in the present invention, and only the following conditions need to be satisfied: one end of the third flow guide channel 3116 is communicated with the third cavity 1113 in the first working state, and the other end of the third flow guide channel 3116 is communicated with the second pilot valve cavity 3119 a; one end of the fourth guide passage 3117 is connected to the second port 3115, and the other end is directly or indirectly connected to the third flow passage 103 provided in the main valve body 111. The third flow guide passage 3116 and the fourth flow guide passage 3117 may be formed by combining two or more straight passages, and the straight passages may be formed by drilling.
In this way, when the second plunger 3112 drives the second stopper 3114 to abut against the second valve notch 3115 to block the second valve notch 3115, the third flow passage 3116 and the fourth flow passage 3117 are cut off.
The first flow guiding part 2113 and the main valve body 11 may be fixed by press-fitting and welding, during manufacturing, a first flow guiding channel 2116 and a second flow guiding channel 2117 are firstly processed on the first flow guiding part 2113, then the first flow guiding part 2113 is installed at one end of the main valve body, and then welding is performed for fixation, at this time, one end of the second flow guiding channel 2117 is located outside the main valve body, and the second flow guiding channel 2117 is communicated with the third flow channel 103 of the main valve body by welding the first connecting pipe 22. Similarly, the second flow guide portion 3113 may be manufactured in the same manner, and fixed to the main valve body 11, and the fourth flow guide passage 3117 may communicate with the third flow passage 103 of the main valve body by using the second connection pipe 32.
As an alternative assembly, it is also possible to provide the first flow guide 2113 with an external thread structure and to provide the main valve body 11 with a corresponding internal thread structure, and then to fix the first flow guide 2113 to the main valve body 11 by means of a thread fit, and then to perform welding. Similarly, the second guide portion 3113 may be fixed to the main valve body 11 by screwing and welding.
Referring to fig. 5, fig. 5 is a schematic structural view of a connecting rod assembly according to another embodiment of the present invention.
The link 14 includes a body 140, and a first connecting portion 141 and a second connecting portion 142 connected to both ends of the body 140. The main body 140 is substantially plate-shaped, and a bent portion is disposed at a side of the plate-shaped main body as a reinforcing portion, the main body 140 can be formed by using a plate, and a fastening portion 1401 is disposed at a middle portion of the main body 140 for fastening with the slider 13, so that when the link 14 moves, the slider 13 can be driven to move in the left-right direction. In order to reduce the pressure loss, the notch portions 1402 may be further provided on both sides of the engaging portion 1401, the number of the notch portions 1402 is not limited, and the notch portions 1402 are provided in the number of 2 in this embodiment because of the convenience of processing, so that the upper and lower sides of the main body 140 have a large penetration area, and the resistance of the connecting rod to the flow of the refrigerant in the second chamber 1112 is reduced.
A first connection portion 141 and a second connection portion 142 are fixedly connected to both ends of the body portion 140. The first connecting portion 141 may be configured to be fixedly connected to the first piston 151, and the second connecting portion 142 may be configured to be fixedly connected to 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-shaped body 140, and may be formed by drilling during machining.
The first connecting portion 141 includes a first connecting portion body 1411 having a substantially oblate disk shape and a first mating portion 1412 fixedly connected to or integrated with the first connecting portion body 1411. In this embodiment, the first connecting portion 1411 is formed by removing two opposite portions from the annular portion, so that the height of the first connecting portion 1411 can be relatively reduced, i.e., it is substantially flat, and the height is smaller than the distance between the annular portions on both sides. The first engaging portion 1412 may be integrally formed with the first connecting portion body 1411 by a material, or may be separately formed and then integrated by various fixing means such as welding or tight-fit connection. The first engaging portion 1412 includes a first recessed portion 1414 and a first hole portion 1413, the first recessed portion 1414 is substantially flat and is adapted to the shape of the end of the connecting rod body portion 140; the first hole 1413 penetrates the first fitting portion 1412 and is adapted to the shape of the first mounting portion 1403 provided in the main body 140. Thus, at the time of mounting, it is possible to insert the end of the body part 140 into the first groove part 1414 and align the first mounting part 1403 with the first hole part 1413, and then pass the first hole part 1413 and the first mounting part 1403 using the first fixing part 143. The first fixing portion 143 is made of a single-piece material, and has two ends thick and a middle thin after assembly, specifically, when assembly is performed, the first fixing portion 143 is first set to have a shape with one thick end, and then passes through the first hole portion 1413 and the first mounting portion 1403, and the end through which the first fixing portion 143 passes is deformed, so that the link body portion 140 and the first connecting portion 141 are fixed.
The number of the first hole portions 1413 and the first mounting portions 1403 may be set to 2, so that the connection strength is relatively higher than one.
Similarly, as a symmetrical structure, the second connecting portion 142 also includes a second connecting portion body 1421 substantially in the shape of an oblate disk and a second matching portion 1422 fixedly connected to or integrally formed with the second connecting portion body 1421. That is, the second engaging portion 1422 may be integrally formed with the second connecting portion body 1421 by a material, or may be separately formed and then integrated by various fixing means such as welding or fitting. The second engaging portion 1422 includes a second recessed portion 1424 and a second hole 1423, the second recessed portion 1424 is substantially flat and is adapted to the shape of the two ends of the connecting rod body 140 or the height of the second recessed portion 1424 is adapted to the shape of the two ends of the deep connecting rod body 140; the second hole 1423 penetrates the second fitting portion 1422 and is adapted to the shape of the second mounting portion 1404 provided in the main body 140. In this way, when mounting, the end of the main body 140 may be inserted into the second groove 1424, the second mounting portion 1404 may be aligned with the second hole 1423, and then the second fixing portion 144 may be inserted through the second hole 1423 and the second mounting portion 1404, the second fixing portion 144 may be made of an integral material, and after the mounting, the second fixing portion 144 may be set to have a shape with one thick end, and then may be inserted through the second hole 1423 and the second mounting portion 1404, and the end through which the second fixing portion 144 passes may be deformed, thereby fixing the link main body 140 and the second connecting portion 142. The fixed connection mode has the advantage of no need of welding, and reduces the environmental pollution in the processing process.
It should be noted that the number of the second hole 1423 and the second mounting portion 1404 may be 2, which results in higher connection strength.
The first connection portion 141 is provided with a first screw portion 145, the second connection portion 142 is provided with a second screw portion 146, the first screw portion 145 is used for fixed connection with the first piston 151, and the second screw portion 146 is used for fixed connection with the second piston 152.
The connecting rod 14 of the present embodiment includes a body 140, a first connecting portion 141, and a second connecting portion 142, and is fixedly connected to the body by a first fixing portion 143 and a second fixing portion 144. Meanwhile, the first connecting part body 1411 and the second connecting part body 1421 are provided with the first thread part 145 and the second thread part 146, so that when the piston is connected with the connecting rod screw, the head of the screw bears high-pressure impact relatively less in the working process, and hidden troubles such as screw falling off when the pressure in the main valve body is too high are effectively prevented. Meanwhile, with the above-mentioned structure, the first thread part 145 and the second thread part 146 may be formed in any length and number as required, so as to achieve sufficient connection strength. In the embodiment shown in fig. 5, the number of the first thread portion 145 and the second thread portion 146 is 4, but it is not limited to 4 in actual application, and may be 4 or more. In addition, the whole connecting rod assembly is stressed uniformly in the action process, the contact surfaces of the first connecting part 141, the second connecting part 142 and the piston part are relatively large, and the stability is better.
It should be noted that the embodiment of the connecting rod 14 is not limited to the electromagnetic switching valve used in the present invention, and those skilled in the art should understand that the combination structure of the connecting rod and the piston is an alternative solution to the main valve body as a whole, and the connecting rod structure provided in this embodiment can be applied to the environment with worse working conditions, high pressure and vibration, and naturally, can also be applied to the environment with better working conditions. That is, the above-mentioned connecting rod structure can also be applied to common electromagnetic four-way valve products in the field of household air conditioners and the like, such as the technical solutions described in the background art.
The piston 15 includes a first piston 151 and a second piston 152, the first piston 151 being fixed to the first connecting portion 141 of the connecting rod 14, and the second piston 152 being fixed to the second connecting portion 142 of the connecting rod 14.
Referring to fig. 6, fig. 6 is a schematic view of a piston structure according to another embodiment of the present invention.
The first piston 151 includes a piston pad 1513 and a piston pressing sheet 1515, and a piston bowl 1514 is disposed between the piston pad 1513 and the piston pressing sheet 1515, wherein the piston pad 1513 and the piston pressing sheet 1515 are both substantially disc-shaped plates with mounting holes, the piston bowl 1514 has a substantially disc-shaped piston bowl body 1514a and a piston sliding portion 1514b extending along the piston bowl body in a bending manner, and when the piston member is assembled in the electromagnetic switching valve, the connecting rod 14 drives the piston 15 to move, the piston sliding portion 1514b slides along the peripheral wall of the main valve cavity 111 to change the space size of the first cavity 1111 and the third cavity 1113.
A piston spring piece 1518 is further provided between the spring plate 1515 and the piston bowl 1514, and the piston spring piece 1518 can provide a supporting force to the piston sliding portion 1514 b.
Of course, the first extension 1517b and the second extension 1517c may be fixed to the bushing body 1517a by welding with separate parts, or one of the first extension 1517b and the second extension 1517c may be integrally formed and the other may be welded with separate parts, and those skilled in the art will appreciate that these alternative techniques can also achieve the object of the present invention in light of the teaching provided by the present embodiment.
Meanwhile, further structural changes can be made to the piston pressing sheet or the piston gasket, for example, a pressing sheet step 1515a is arranged at the position of the piston pressing sheet 1515, which is in contact with the second extension part 1517c, so that the second extension part 1517c is abutted against the pressing sheet step 1515 a; alternatively, a gasket step 1513a may be provided at a portion of the piston gasket 1513 contacting the first extension 1517b such that the first extension 1517b abuts against the gasket step 1513a, as shown in fig. 6.
The pressing step 1515a and the spacer step 1513a may be provided alternatively or simultaneously.
After the first piston 151 is manufactured, the first piston is fixedly connected to one end of the connecting rod 14 by means of screws. Specifically, the piston pressing piece of the first piston 151 is abutted against the first connection portion 141 of the connecting rod, and then a screw is screwed into a first screw portion provided on the first connection portion 141, thereby fixing the first piston 151 and the connecting rod 14 as a whole.
While the first piston 151 has been described as an example, the second piston 152 may have the same structure as the first piston 151, and those skilled in the art can understand the structure of the second piston 152 and fix the second piston 152 to the second connecting portion 142 of the connecting rod in the same manner as in the above disclosure.
It should be noted that the above-mentioned 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 combination structure of the connecting rod and the piston is an alternative solution to the main valve body as a whole, and the piston structure provided in this embodiment can be applied to the environment of high pressure and vibration with worse working conditions, and naturally can also be applied to the environment with better working conditions. That is, the piston structure can also be applied to common four-way solenoid valves in the fields of household air conditioners and the like, such as the technical solutions described in the background art.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electromagnetic switching valve according to another embodiment of the present invention.
In order to avoid redundant description, in the description of the present embodiment, reference may be made to the description of the other embodiments above for the components with the same reference numbers, and the description will not be repeated here in detail, but only for the differences.
A main valve cavity 111, a first flow passage 101, a second flow passage 102, a third flow passage 103 and a fourth flow passage 104 are formed in the main valve body 11; the second flow channel 102, the third flow channel 103 and the fourth flow channel 104 are located on the same side, and the first flow channel 101 is located on the opposite side. The first flow channel 101 may communicate with a high pressure side (i.e., a discharge port of the compressor) of the refrigeration system, and the third flow channel 103 may communicate with a low pressure side (i.e., a suction port of the compressor) of the refrigeration system, so that the refrigerant in the first flow channel 101 is always maintained at a high temperature and a high pressure, and the refrigerant in the third flow channel 103 is always maintained at a relatively low temperature and a low pressure during operation.
The main valve body 11 is formed by metal materials and directly forms four flow passages or is processed to form four flow passages, compared with the prior art, the welding mode of the valve body and the connecting pipe is not needed, the failure hidden danger caused by the influence of factors such as high pressure, vibration and the like on the welding part is reduced, the integral structural strength is higher, and the work is more reliable.
The main valve chamber 111 is provided with a main valve seat 12 fixedly connected to the main valve body 11, a slider 13 slidable on the main valve seat 12, a connecting rod 14 for moving the slider 13, and a first piston 151 and a second piston 152 fixed to both ends of the connecting rod 14.
The first pilot valve 21 includes a first guide portion 2113, and the second pilot valve 31 includes a second guide portion 3113. The first flow guide portion 2113 may be formed by a metal material such as stainless steel, and is integrally formed or machined to have a first valve port 2115, a first flow guide channel 2116 and a second flow guide channel 2117 disposed inside the first flow guide portion 2113. The second guide portion 3113 may also be formed by a metal material such as stainless steel, and is provided with a second valve port portion 3115, a third guide passage 3116 and a fourth guide passage 3117 inside the second guide portion 3113.
The internal structures of the first pilot valve 21 and the second pilot valve 31 can be understood by referring to the description of the other embodiments above, and are not described again here.
The main valve body 11 is formed by casting or forging a metal, such as a stainless steel or aluminum material, etc., the main valve body 11 may be an integral structure, and a first main valve flow guiding passage 112 and a second main valve flow guiding passage 113 are further formed in the main valve body 11, and the first main valve flow guiding passage 112 and the second main valve flow guiding passage 113 may be formed by combining more than two linear passages formed by drilling, etc.
One end of the first main valve diversion passage 112 is communicated with the first diversion passage 2116 of the first diversion portion 2113, and the other end is communicated with the third flow passage 103 of the main valve body 11. The same is true; one end of the second main valve pilot passage 113 is communicated with the fourth pilot passage 3117 of the second pilot portion 2113, and the other end is communicated with the third flow passage 103 of the main valve body 11.
The first flow guide portion 2113 and the main valve body 11 may be fixed by press-fitting and welding, in manufacturing, a first flow guide passage 2116 and a second flow guide passage 2117 are firstly processed on the first flow guide portion 2113, then the first flow guide portion 2113 is installed into one end of the main valve body, and one end of the first flow guide passage 2116 is aligned and communicated with the first main valve flow guide passage 112 of the main valve body, and then welding and fixing are performed. Similarly, the second flow guide portion 3113 and the main valve body 11 may be fixed by press-fitting and welding, and in manufacturing, the third flow guide channel 3116 and the fourth flow guide channel 3117 are machined on the second flow guide portion 3113, then the second flow guide portion 3113 is installed on the other end of the main valve body, and one end of the fourth flow guide channel 3117 is aligned with and communicated with the second main valve flow guide channel 113 of the main valve body, and then welding and fixing are performed.
Because the main valve body is provided with the first main valve flow guide channel 112 and the second main valve flow guide channel 113, a connecting pipe does not need to be arranged outside the main valve body, the structure of the whole product is more compact, and the failure risk of the welding part of the connecting pipe in high-pressure and vibration working environments is reduced.
The working principle of the electromagnetic switching valve provided by the 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 does not generate electromagnetic force, and at this time, the second plunger 3112 drives the second blocking portion 3114 to block the second valve port portion 3115 under the action of the elastic force of the second return spring 3118, so that the third fluid guide passage 3116 and the fourth fluid guide passage 3117 are in a cut-off state.
The first coil 212 is energized to generate electromagnetic force, so that the first movable iron core 2112 overcomes the elastic force of the first return spring 2118 and is attracted to the first stationary iron core 2111, thereby driving the first blocking portion 2114 to be away from the first valve port portion 2115, and at this time, the first flow guide channel 2116 and the second flow guide channel 2117 are in a communication state. Since the second flow guide channel 2117 is communicated with the third flow channel 103 through the first connection pipe 22, and the third flow channel 103 is communicated with the suction port of the compressor, the inner cavity of the first pilot valve is in a low-pressure state, when the first cavity 1111 is communicated with the inner cavity of the first pilot valve, the first cavity 1111 is also in a low-pressure state, the second cavity 1112 is communicated with the first flow channel 101, and the first flow channel 101 is communicated with the exhaust port of the compressor, so that the second cavity 1112 is in a high-pressure state, and under the action of differential pressure, the first piston 151 is pushed to move to the left in the figure until the conical plug of the first piston 151 abuts against the first flow guide portion 2113 and seals the second flow guide channel 2117, so as to drive the slider 13 to move and cover the first through hole 121 of the valve seat. At this time, the first flow passage 101 communicates with the fourth flow passage 103 through the second cavity 1112. The electromagnetic switching valve is in a first working state.
At this time, the flow direction of the refrigerant in the electromagnetic switching valve is as follows: the high-temperature and high-pressure refrigerant discharged from the compressor enters the second cavity 1112 through the first flow channel 101, and then flows out of the fourth flow channel 104.
2. The first coil 212 is not energized and the second coil 312 is energized.
The first coil 212 is not energized and does not generate electromagnetic force, and at this time, the first movable iron core 2112 drives the first blocking portion 2114 to block the first valve port portion 2115 under the elastic force of the first return spring 2118, so that the first flow guide channel 2116 and the second flow guide channel 2117 are in a cut-off state.
The second coil 312 is energized to generate an electromagnetic force, so that the second movable iron core 3112 overcomes the elastic force of the second return spring 3118 and is attracted to the second stationary iron core 3111, thereby driving the second blocking portion 3114 to be away from the second valve port portion 3115, and at this time, the third flow guide passage 3116 and the fourth flow guide passage 3117 are in a communicating state. Since the fourth guide passage 3117 is communicated with the third flow passage 103 through the second connection pipe 32, the third flow channel 103 is connected to the air inlet of the compressor, so the third cavity 1113 connected to the inner cavity of the second pilot valve through the third flow channel 3116 is also in a low pressure state, and the second cavity 1112 is communicated with the first flow passage 101, and the first flow passage 101 is communicated with the exhaust port of the compressor, so that the second cavity 1112 is in a high pressure state, under the action of the pressure difference, the piston is pushed and the slider 13 is driven to move to the right side of the figure until the conical plug of the second piston 152 is abutted against the second flow guide part 3113 and blocks the third flow guide channel 3116, at this time, the concave part of the slider is matched with the main valve seat to form a cavity which can be used for conducting, and is simultaneously communicated with the third flow channel 103 and the fourth flow channel 104, thereby communicating the third flow passage 103 with the fourth flow passage 104 while the first flow passage 101 communicates with the second flow passage 102 through the second cavity 1112. The electromagnetic switching valve is in a second working state.
At this time, the refrigerant flow direction is as follows: the high-temperature and high-pressure refrigerant discharged by the compressor enters the second cavity 1112 through the first flow channel 101, then flows out of the second flow channel 102, passes through the throttle valve and the heat exchanger, flows into the electromagnetic switching valve from the third flow channel 103, and flows out of the fourth flow channel 104 to return to the compressor, so that a cycle is formed.
The refrigerant flow direction of the electromagnetic switching valve during operation is described in the above specific embodiment, which is different from the refrigerant flow direction switching described in the background art, so as to meet the refrigerant flow direction requirement of the vehicle-mounted refrigeration system. Of course, those skilled in the art can reset the opening positions of the second flow channel 102, the third flow channel 103, and the fourth flow channel 104 without creative work based on the teaching provided in this embodiment, and when the slider 13 moves to the first operating position on the left side, the second flow channel 102 and the third flow channel 103 are conducted, and when the slider 13 moves to the right side and is in the second operating position, the third flow channel 103 and the fourth flow channel 104 are conducted, so as to form 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 does not generate electromagnetic force, and at this time, the second plunger 3112 drives the second blocking portion 3114 to block the second valve port portion 3115 under the action of the elastic force of the second return spring 3118, so that the third flow guide channel 3116 and the fourth flow guide channel 3117 are in a cut-off state.
The first coil 212 is energized to generate electromagnetic force, so that the first movable iron core 2112 overcomes the elastic force of the first return spring 2118 and is attracted to the first stationary iron core 2111, thereby driving the first blocking portion 2114 to be away from the first valve port portion 2115, and at this time, the first flow guide channel 2116 and the second flow guide channel 2117 are in a communication state. Since second flow-directing passage 2117 is in communication with third flow passage 103 through first connecting tube 22, and the third flow channel 103 is communicated with the suction port of the compressor, so the inner cavity of the first pilot valve is in a low-pressure state, under the condition that the first cavity 1111 is communicated 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 communicated with the first flow passage 101, and the first flow passage 101 is communicated with the exhaust port of the compressor, so that the second cavity 1112 is in a high pressure state, under the action of the pressure difference, the first piston 151 is pushed to move to the left until the conical plug of the first piston 151 is abutted with the first flow guide part 2113 and blocks the second flow guide passage 2117, thereby driving the slider 13 to move leftwards, the slider concave part and the main valve seat are matched to form a cavity which can be used for conducting, and the second flow passage 102 and the third flow passage 103 are conducted, at this time, the first flow passage 101 communicates with the fourth flow passage 103 through the second cavity 1112.
At this time, the refrigerant flow direction is as follows: the high-temperature and high-pressure refrigerant discharged by the compressor enters the second cavity 1112 through the first flow channel 101, then flows out of the fourth flow channel 104, passes through the throttle valve and the heat exchanger, flows into the electromagnetic switching valve from the third flow channel 103, and flows out of the second flow channel 102 to return to the compressor, so that a cycle is formed.
2. The first coil 212 is not energized and the second coil 312 is energized.
The first coil 212 is not energized and does not generate electromagnetic force, and at this time, the first movable iron core 2112 drives the first blocking portion 2114 to block the first valve port portion 2115 under the elastic force of the first return spring 2118, so that the first flow guide channel 2116 and the second flow guide channel 2117 are in a cut-off state.
The second coil 312 is energized to generate an electromagnetic force, so that the second movable iron core 3112 overcomes the elastic force of the second return spring 3118 and is attracted to the second stationary iron core 3111, thereby driving the second blocking portion 3114 to be away from the second valve port portion 3115, and at this time, the third flow guide passage 3116 and the fourth flow guide passage 3117 are in a communicating state. Since the fourth guide passage 3117 is communicated with the third flow passage 103 through the second connection pipe 32, the third flow channel 103 is connected to the air inlet of the compressor, so the third cavity 1113 connected to the inner cavity of the second pilot valve through the third flow channel 3116 is also in a low pressure state, and the second cavity 1112 is communicated with the first flow passage 101, and the first flow passage 101 is communicated with the exhaust port of the compressor, so that the second cavity 1112 is in a high pressure state, under the action of the pressure difference, the piston is pushed and the slider 13 is driven to move to the right side until the conical plug of the second piston 152 is abutted against the second flow guide part 3113 and blocks the third flow guide channel 3116, at this time, the concave part of the slider is matched with the main valve seat to form a cavity which can be used for conducting and is simultaneously communicated with the third flow channel 103 and the fourth flow channel 104, thereby communicating the third flow passage 103 with the fourth flow passage 104 while the first flow passage 101 communicates with the second flow passage 102 through the second cavity 1112. The electromagnetic switching valve is in a second working state.
At this time, the refrigerant flow direction is as follows: the high-temperature and high-pressure refrigerant discharged by the compressor enters the second cavity 1112 through the first flow channel 101, then flows out of the second flow channel 102, passes through the throttle valve and the heat exchanger, flows into the electromagnetic switching valve from the third flow channel 103, and flows out of the fourth flow channel 104 to return to the compressor, so that a cycle is formed.
The refrigerant flow path switching process of the electromagnetic switching valve of the new embodiment is similar to that described in the background art.
The term "communication" as used herein and in the appended claims means physical communication, i.e., allowing a flow refrigerant to flow through a channel or allowing a flow refrigerant to flow through a channel under a certain condition, and even if a certain connected channel is temporarily cut off (for example, when the first valve port 2115 is closed by the first closing portion 2114), the "communication" described herein is established between the first guide channel 2116 and the second guide channel 2117 through the first valve port 2115; it is considered to be "disconnected" only when the refrigerant cannot pass through the two spaces or the flow passages until the beginning.
Herein, the directional terms upper, lower, left and right are defined with reference to the drawings shown in the drawings of the specification only for the convenience of understanding and presentation and should not limit the scope of the present application.
The electromagnetic switching valve provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A piston for an electromagnetic switching valve, characterized in that it comprises a first piston (151) fixedly connected to a first connection portion (141) of a connecting rod (14), a second piston (152) fixedly connected to a second connection portion (142) of the connecting rod (14);
the first piston (151) comprises a piston washer (1513) and a piston pressing plate (1515), and a piston bowl (1514) and a piston spring plate (1518) arranged between the piston washer (1513) and the piston pressing plate (1515); the piston gasket (1513), the piston pressing plate (1515), the piston bowl (1514) and the piston spring piece (1518) are all provided with middle through holes;
the first piston (151) further comprises a conical plug (1512), a bushing (1517) and a fixed seat (1511), wherein the bushing (1517) penetrates through the middle through hole and is fixedly connected with the piston gasket (1513) and the piston pressing sheet (1515); the fixing seat (1511) comprises a fixing seat body part (1511b), the conical plug (1512) is partially arranged inside the fixing seat body part (1511b), and a conical plug spring (1516) is further arranged inside the bushing (1517).
2. The piston according to claim 1, characterized in that the bush (1517) includes a bush body (1517a) and a first extension (1517b) and a second extension (1517c) respectively located at both ends of the bush body (1517a), the first extension (1517b) abutting against the piston pad (1513), the second extension (1517c) abutting against the piston presser plate (1515).
3. The piston according to claim 2, characterized in that the bush body (1517a) is made of a single material with the first extension portion (1517b) and the second extension portion (1517c), and is crimped at both ends of the bush body (1517a) to form the first extension portion (1517b) and the second extension portion (1517c), respectively.
4. The piston of claim 2, wherein the first extension (1517b) and/or the second extension (1517c) is a separate component secured to the liner body (1517a) by welding.
5. The piston of claim 2, wherein said piston presser plate (1515) is provided with a presser plate step (1515a), and said second extension (1517c) abuts against said presser plate step (1515 a).
6. The piston according to claim 2, characterized in that the piston shim (1513) is provided with a shim step (1513a), the first extension (1517b) abutting the shim step (1513 a).
7. The piston according to claim 1, characterized in that the conical plug (1512) abuts the first flow guide (2113) and closes off the first flow guide channel (2116) when the first piston (151) is in the first operating position.
8. Piston according to claim 7, characterized in that the first piston (151) is fixed to the first connection (141) by means of a screw connection and the second piston (152) is fixed to the second connection (142) by means of a screw connection.
9. Piston according to claim 1, characterized in that the first piston (151) and the second piston (152) are of identical construction.
10. 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 comprises a first valve body (211) and a first coil (212) which are matched with each other, the second pilot valve comprises a second valve body (311) and a second coil (312) which are matched with each other, the first valve body (211) comprises a first flow guide part (2113), and the second valve body (311) comprises a second flow guide part (3113);
the main valve comprises a main valve body (111), the main valve body (111) comprises a first flow passage (101), a second flow passage (102), a third flow passage (103) and a fourth flow passage (104), and the first flow guide part (2113) and the second flow guide part (3113) are respectively fixed at two ends of the main valve body (111);
A connecting rod (14) and a piston (15) are arranged in the main valve body (11), and the piston (15) adopts the piston of any one of the claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711471365.2A CN109990113B (en) | 2017-12-29 | 2017-12-29 | Electromagnetic switching valve and piston |
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| CN201711471365.2A CN109990113B (en) | 2017-12-29 | 2017-12-29 | Electromagnetic switching valve and piston |
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| CN109990113B true CN109990113B (en) | 2022-06-10 |
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| Publication number | Publication date |
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| CN109990113A (en) | 2019-07-09 |
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