CN219639444U - Electromagnetic valve - Google Patents

Abstract

The utility model provides an electromagnetic valve, and relates to the technical field of fluid control. The electromagnetic valve comprises a valve body, a cover plate, a piston, a reinforcing part and a medium channel, wherein the valve body is provided with an inlet, an outlet and a mounting groove, and the cover plate is arranged in the mounting groove. The piston is arranged in the valve body and is positioned between the cover plate and the outlet. The medium channel is arranged on the valve body, one end of the medium channel is communicated with the inlet through the piston cavity, and the other end of the medium channel is configured to be switched between a closed state and a conducting state and used for controlling the piston to slide relative to the valve body, so that the piston is selectively blocked at the outlet and used for opening and closing the outlet. The reinforcing part is at least partially arranged in the middle of the cover plate. The whole strength of the cover plate can be improved by utilizing the reinforcing part, so that the pressure bearing capacity of the cover plate is improved. Because the center of the cover plate is the part with the worst bearing capacity, the part with the weakest bearing capacity of the cover plate is emphasized and reinforced, and the cost of production materials is lower, so that the double functions of structural strength and production cost can be compatible.

Description

Electromagnetic valve

Technical Field

The present utility model relates generally to the field of fluid control technology, and more particularly to a solenoid valve.

Background

Currently, solenoid valves generally include a valve body member, a piston member and a cover plate, the cover plate is disposed at a port of the valve body member, the piston member is slidably disposed inside the valve body member, and when the piston member slides with respect to the valve body member, the cover plate is easily impacted.

The existing cover plate is usually of a flat plate structure, the bearing capacity of the cover plate of the flat plate structure at the central position is relatively poor, and if the cover plate is integrally thickened, the cost of the whole material of the cover plate is increased.

Disclosure of Invention

The electromagnetic valve provided by the utility model has the advantages of good structural strength and low production cost.

According to one aspect of the present utility model, there is provided a solenoid valve comprising:

the valve body is provided with an inlet, an outlet and a mounting groove;

the cover plate is arranged in the mounting groove;

the piston is arranged in the valve body and is positioned between the cover plate and the outlet;

the medium channel is arranged on the valve body, one end of the medium channel is communicated with the inlet through the inner cavity of the valve body, the other end of the medium channel is configured to be switched between a closed state and a conducting state and used for controlling the piston to slide relative to the valve body, so that the piston is selectively blocked at the outlet and used for opening and closing the outlet;

and the reinforcing part is at least partially arranged in the middle of the cover plate.

In some embodiments, the reinforcement is disposed on a side of the cover plate facing the piston; and/or the number of the groups of groups,

the reinforcing part is arranged on one side of the cover plate away from the piston.

In some embodiments, the reinforcement is a protrusion protruding on a side of the cover plate.

In some embodiments, the maximum thickness of the reinforcement portion is D and the thickness of the cover plate is D along the axial direction of the piston;

wherein D+d is more than or equal to 1.1D.

In some of these embodiments, the thickness of the reinforcement portion at the central portion is greater than the thickness of the reinforcement portion at the edge portion in the radial direction of the piston.

In some of these embodiments, the thickness of the reinforcement portion decreases gradually from a middle portion of the reinforcement portion to the edge portion.

In some embodiments, a central portion of the cover plate, which is close to the inner side surface of the piston, is recessed in a direction away from the piston to form the reinforcing portion; or alternatively, the first and second heat exchangers may be,

the central portion of the cover plate, which is close to the inner side surface of the piston, protrudes toward the piston to form the reinforcing portion.

In some embodiments, an inner side surface of the cover plate, which is close to the piston, is in a circular arc structure, and a first included angle alpha is formed between a tangential direction of the inner side surface and a reference surface;

the reference surface is parallel to the end surface of the piston and perpendicular to the axial direction of the valve body.

In some embodiments, the first angle α is greater than or equal to 5 °.

In some embodiments, the cover plate and the reinforcement are an integrally formed structure.

In some embodiments, the valve body and the cover plate are connected by riveting.

One embodiment of the present utility model has the following advantages or benefits:

according to the electromagnetic valve provided by the embodiment of the utility model, high-pressure medium enters the inner cavity of the valve body through the inlet, enters the medium channel through one end of the medium channel after passing through the gap between the piston and the inner cavity of the valve body, and when the other end of the medium channel is in a closed state, the inner cavity of the valve body and the medium channel are both high-pressure medium at the moment, so that the piston is pushed to move towards the direction close to the outlet, and the outlet is blocked. When the other end of the medium channel is in a conducting state, the inner cavity of the valve body plays a role in pressure relief, so that the piston can be controlled to move in the direction of approaching to the cover plate in the inner cavity of the valve body, and the outlet is controlled to be opened, so that high-pressure medium directly enters the medium outlet from the inlet.

Through being provided with the reinforcing part on the apron, utilize the reinforcing part can improve the bulk strength of apron to improve the bearing capacity of apron. Compared with the mode of integrally thickening the cover plate in the prior art, the center of the cover plate is the part with the worst bearing capacity, the reinforcing part is at least partially arranged in the middle of the cover plate, the part with the weakest bearing capacity of the cover plate is emphasized and reinforced, the cost of production materials is lower, and the double functions of structural strength and production cost can be compatible.

Drawings

For a better understanding of the utility model, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present utility model. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. The above and other features and advantages of the present utility model will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Wherein:

fig. 1 is a schematic structural diagram of a solenoid valve according to a first embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a piston in a solenoid valve according to a first embodiment of the present utility model;

fig. 3 is a schematic structural view of a cover plate of the electromagnetic valve before the reinforcing part is added according to the first embodiment of the present utility model;

fig. 4 is a schematic diagram showing a structure of a cover plate of the electromagnetic valve after the reinforcing part is added according to the first embodiment of the utility model;

fig. 5 shows a second schematic structural diagram of the cover plate of the electromagnetic valve after the reinforcing part is added in the electromagnetic valve according to the first embodiment of the utility model;

fig. 6 is a schematic diagram of a structure of a cover plate of a solenoid valve after a reinforcing part is added according to a second embodiment of the present utility model;

fig. 7 is a schematic diagram showing a second structure of a cover plate of the electromagnetic valve according to the second embodiment of the utility model after the reinforcing portion is added.

Wherein reference numerals are as follows:

1. a valve body; 2. a cover plate; 3. a piston; 4. a media channel; 5. a reinforcing part; 6. a sleeve; 7. a first spring; 8. a stationary core; 9. a second spring; 10. a movable iron core; 11. a blocking member; 100. a valve guide cavity;

101. a mounting groove; 102. an inner cavity; 103. an inlet; 104. an outlet; 105. a pilot valve through hole;

31. a closed end; 32. a piston chamber; 33. a main body guide section; 34. tail end; 35. balance holes.

Detailed Description

The technical solutions in the exemplary embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present utility model. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present utility model, and it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of the utility model.

In the description of the present utility model, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present utility model, it should be understood that the terms "upper", "lower", "inner", "outer", and the like in the exemplary embodiments of the present utility model are described in terms of the drawings, and should not be construed as limiting the exemplary embodiments of the present utility model. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

The present embodiment provides a solenoid valve, as shown in fig. 1, which includes a valve body 1, a cover plate 2, a piston 3, and a medium passage 4, the valve body 1 is provided with an inlet 103, an outlet 104, and a mounting groove 101, and the cover plate 2 is disposed in the mounting groove 101. A piston 3 is disposed within the valve body 1 between the cover plate 2 and the outlet 104. The medium channel 4 is arranged on the valve body 1, one end of the medium channel 4 is communicated with the inlet 103 through the piston cavity 32, and the other end of the medium channel 4 is configured to be switched between a closed state and a conducting state and used for controlling the piston 3 to slide relative to the valve body 1, so that the piston 3 is selectively blocked at the outlet 104 and used for opening and closing the outlet 104.

According to the electromagnetic valve provided by the embodiment, high-pressure medium enters the inner cavity 102 of the valve body 1 through the inlet 103, and after passing through the gap between the piston 3 and the inner cavity 102 in the valve body 1, enters the medium channel 4 through one end of the medium channel 4, and when the other end of the medium channel 4 is in a closed state, the inner cavity 102 of the valve body 1 and the medium channel 4 are both high-pressure medium at the moment, the piston 3 is pushed to move towards the direction close to the outlet 104, so that the outlet 104 is plugged. When the other end of the medium channel 4 is in a conducting state, the inner cavity 102 of the valve body 1 plays a role in pressure relief, so that the piston 3 can be controlled to move in the direction of approaching the cover plate 2 in the inner cavity 102 of the valve body 1, and the outlet 104 is controlled to be opened, so that high-pressure medium directly enters the medium outlet 104 from the inlet 103.

It should be noted that the piston 3 is slidably disposed in the inner cavity 102 of the valve body 1, and the shape of the piston 3 is adapted to the shape of the inner cavity 102 of the valve body 1.

In one embodiment, as shown in fig. 1, the solenoid valve further comprises a pilot valve, which is provided on the valve body 1. The pilot valve comprises a sleeve 6, a coil (not shown in the figure), a static iron core 8, a first spring 7 and a movable iron core 10, wherein the coil is sleeved outside the sleeve 6, the static iron core 8 is arranged in the sleeve 6 and positioned on the upper half part of the sleeve 6, and the coil is fixed with the static iron core 8 through a screw. The movable iron core 10 is arranged in the sleeve 6 and positioned at the lower half part of the sleeve 6, one end of the movable iron core 10 is abutted to the static iron core 8 through the first spring 7, and the other end of the movable iron core 10 is provided with a blocking piece 11.

The valve body 1 is further provided with a pilot valve through hole 105, wherein one end of the pilot valve through hole 105 is communicated with the outlet 104, the other end of the pilot valve through hole 105 is communicated with the pilot valve cavity 100 and is blocked or opened by the blocking piece 11, the inner diameter of the pilot valve through hole 105 is matched with the size of the blocking piece 11, and the inner diameters of the medium inlet 103 and the medium outlet 104 are far larger than the inner diameter of the pilot valve through hole 105 so as to adapt to the passage of a large flow medium. At this time, a pilot valve cavity 100 surrounded by the sleeve 6, the static iron core 8, the first spring 7 and the movable iron core 10 is formed above the pilot valve through hole 105, and the pilot valve cavity 100 is communicated with the inner cavity 102 of the valve body 1 through the medium channel 4.

The electromagnetic force generated by the coil controls the brake iron core 10 to reciprocate in the sleeve 6, and controls the opening and closing of the medium channel 4 through the blocking piece 11 at one end of the brake iron core 10, so as to control the piston 3 to reciprocate in the inner cavity 102 of the valve body 1, thereby controlling the conduction and closing between the inlet 103 and the outlet 104, namely the opening and closing of the electromagnetic valve.

In one embodiment, as shown in fig. 2, the piston 3 includes a main body guiding section 33, a closed end 31, and a tail end 34, wherein a guiding surface of the main body guiding section 33 forms clearance fit with the inner cavity 102 of the valve body 1, so that the main body guiding section 33 can reciprocate in the inner cavity 102 of the valve body 1, and when the electromagnetic valve is operated, high-pressure medium can enter the interior of the piston 3 through a clearance between the guiding surface of the main body guiding section 33 and the inner cavity 102 of the valve body 1.

The outer diameter of the closed end 31 is smaller than the outer diameter of the body guide section 33 so as to form a stepped structure between adjacent ones of the two. The closed end 31 is provided with a sealing plug, so that the sealing tightness of the outlet 104 in a sealed state is ensured, the sealing plug is made of PTFE material and is directly matched with the outlet 104 to realize the opening or closing of the medium outlet 104.

The piston 3 is of a hollow structure, a piston cavity 32 is arranged in the piston 3, a balance hole 35 is further formed in the piston 3, the piston cavity 32 is communicated with the outside of the piston 3, and high-pressure medium can flow through the balance hole 35. When the coil is in a power-off state and the pilot valve through hole 105 is closed by the blocking piece 11, high-pressure medium is enabled to enter the piston cavity 32 rapidly, and the piston 3 can reach a stress balance state.

The working process of the electromagnetic valve provided by the embodiment is as follows:

when the coil is powered off, high-pressure medium enters the medium inlet 103, enters the piston cavity 32 through a gap between the piston 3 and the inner cavity 102 of the valve body 1 and the balance hole 35 of the piston 3, and enters the valve guide cavity 100 through the through hole between the piston 3 and the cover plate 2 and the medium channel 4, and at the moment, the movable iron core 10 drives the plugging piece 11 to move downwards under the action of the first spring 7, so that the valve guide through hole 105 is closed. The medium inlet 103, the piston cavity 32, the medium channel 4 and the valve guide cavity 100 are all filled with high-pressure medium, so that the right side of the piston 3 is a high-pressure area, the left side of the piston 3 is communicated with the outlet 104 and is a low-pressure area, and the piston 3 moves away from the cover plate 2 under the action of pressure difference to seal the outlet 104.

When the coil is electrified, a magnetic field is generated inside the coil, the movable iron core 10 and the static iron core 8 are magnetized, the movable iron core 10 overcomes the spring force of the first spring 7 and the pressure difference force of the high-pressure medium under the action of magnetic force, the movable iron core 10 moves towards the static iron core 8, and the blocking piece 11 is driven to be separated from the pilot valve through hole 105. The high-pressure medium sequentially passes through the medium channel 4 and the pilot valve through hole 105 to enter the medium outlet 104. The piston chamber 32 becomes a low pressure area because the flow area of the medium passage 4 and the pilot valve through hole 105 is much larger than the sum of the flow areas formed by the balance hole 35 and the gap between the piston 3 and the inner chamber 102 of the valve body 1. At this time, the high pressure medium entering from the inlet 103 acts on the stepped structure formed between the closed end 31 of the piston 3 and the main body guide section 33 and the outer circumferential end surface of the closed end 31 of the piston 3, and the pressure of the high pressure medium outside the piston 3 is far greater than the pressure of the medium in the piston chamber 32 and the elastic force of the second spring 9, so that the piston 3 is pushed to move in the direction approaching to the cover plate 2, and the high pressure medium directly enters the outlet 104 from the inlet 103.

If the cover plate 2 is in a flat plate structure (as shown in fig. 3), the bearing capacity of the cover plate 2 in the central position of the flat plate structure is relatively poor, and when the cover plate 2 is integrally thickened, the cost of the whole material of the cover plate 2 is increased.

In order to solve this problem, as shown in fig. 4 to 5, the electromagnetic valve provided in this embodiment further includes a reinforcing portion 5, and the reinforcing portion 5 is at least partially disposed in the middle of the cover plate 2.

By providing the reinforcing portion 5 on the cover plate 2, the overall strength of the cover plate 2 can be improved by the reinforcing portion 5, thereby improving the pressure bearing capacity of the cover plate 2. Compared with the prior art adopting the mode of integral thickening, because the center of the cover plate 2 is the part with the worst bearing capacity, the reinforcing part 5 is at least partially arranged in the middle of the cover plate 2, the part with the weakest bearing capacity of the cover plate 2 is emphasized and reinforced, the cost of production materials is lower, and the double functions of structural strength and production cost can be compatible.

In one embodiment, the reinforcement 5 is a protrusion protruding on the side of the cover plate 2.

The side surface of the cover plate 2 is convexly provided with a bulge to form a reinforcing part 5, which is equivalent to reinforcing the thickness of the cover plate 2 along the axial direction of the piston 3, so as to improve the pressure bearing and deformation resistance of the cover plate 2 and avoid failure caused by insufficient pressure bearing or serious deformation of the cover plate 2, which is easy to separate from the mounting groove 101 of the valve body 1.

In one embodiment, as shown in fig. 4 to 5, the reinforcement 5 is provided on the side of the cover plate 2 facing the piston 3; and/or the reinforcement 5 is provided on the side of the cover plate 2 remote from the piston 3.

The reinforcing portion 5 may be provided on a side of the cover plate 2 facing the piston 3, which corresponds to providing the reinforcing portion 5 on an inner side surface of the cover plate 2 to thicken the inner side surface of the cover plate 2. The reinforcing portion 5 may also be disposed on a side of the cover plate 2 away from the piston 3, which corresponds to the reinforcing portion 5 being disposed on an outer side surface of the cover plate 2 to thicken the outer side surface of the cover plate 2. The reinforcement portion 5 may also be disposed on a side of the cover plate 2 facing the piston 3, and the reinforcement portion 5 is disposed on a side of the cover plate 2 away from the piston 3, so that the reinforcement portion 5 is disposed on an inner side surface and an outer side surface of the cover plate 2, respectively.

It is understood that the reinforcement 5 is not limited to be provided on the inner side surface, the outer side surface, or both the inner side surface and the outer side surface of the cover plate 2, and may be adjusted according to actual production conditions.

In one embodiment, the maximum thickness of the reinforcement 5 is D and the thickness of the cover plate 2 is D along the axial direction of the piston 3; wherein D+d is more than or equal to 1.1D. So arranged that, in this way,

the overall thickness of the back cover plate 2 with the reinforcing part 5 is set to be 1.1 times or more of the thickness d of the original cover plate 2 without the reinforcing part, so that the structural reinforcing effect of the cover plate 2 is improved.

In one embodiment, the thickness of the reinforcing portion 5 at the central portion is greater than the thickness of the reinforcing portion 5 at the edge portion in the radial direction of the piston 3.

Because the center of the cover plate 2 is the part with the worst pressure bearing capacity, the thickness of the part of the reinforcing part 5 at the middle part is larger than that of the part of the reinforcing part 5 at the edge part, the part of the cover plate 2 with the weakest pressure bearing is emphasized and the part of the cover plate 2 with better pressure bearing is assisted and reinforced, so that the best strength effect can be realized by using lower production cost.

In one embodiment, as shown in fig. 4 to 5, the thickness of the reinforcing portion 5 gradually decreases from the middle portion to the edge portion of the reinforcing portion 5.

The appearance of the reinforcing part 5 can be in a circular arc structure, the thickness of the reinforcing part 5 gradually decreases from the middle part of the reinforcing part 5 to the edge part, the thickness of the reinforcing part 5 plays a role in smooth transition, and the condition that sharp edges and corners appear on the surface of the reinforcing part 5 is avoided.

In one embodiment, the cover plate 2 and the reinforcement 5 are of an integrally formed construction.

Compared with the split structure, the cover plate 2 and the reinforcing part 5 are of an integrated structure, so that the time for assembling parts is saved, and the production cost is lower.

Example two

The principle and effect of the present embodiment are similar to those of the first embodiment, except that the specific structures of the reinforcing portion 5 and the cover plate 2 are different.

As shown in fig. 6 to 7, the present embodiment provides a reinforcing portion 5 in which a central portion of an inner side surface of the piston 3 is recessed in a direction away from the piston 3 to form the reinforcing portion 5; or, the center portion of the reinforcing portion 5 near the inner side surface of the piston 3 protrudes toward the piston 3 to form the reinforcing portion 5.

In other words, the central portion of the inner side surface of the cover plate 2 may protrude or be recessed inward, and the reinforcement portion 5 formed at this time may resist to some extent the impact of the cover plate 2 due to the high pressure medium or the piston 3 for reducing the deformation amount of the cover plate 2, thereby reducing the case where the cover plate 2 slips out of the mounting groove 101 due to the deformation, to reduce the risk of failure of the solenoid valve.

It will be appreciated that the cover plate 2 and the reinforcing portion 5 may be an integrally formed structure, and that the cover plate 2 may be press formed to form the reinforcing portion 5.

In one embodiment, the inner side of the reinforcement 5 of the cover plate 2, which is adjacent to the piston 3, has a circular arc-shaped structure. In other embodiments, as shown in fig. 6, the first angle α between the tangential direction of the inner side surface and the reference surface x is set to 5 ° or more. For example, in some embodiments, the first angle α may be set to 5 °, 8 ° or 15 °, and the larger the value selected by the first angle α, the stronger the deformation resistance of the cover plate 2, where the specific size of the first angle α may be set according to the actual situation, which is not an example. Wherein the reference plane x is parallel to the end surface of the piston 3 and perpendicular to the axial direction of the valve body 1.

Since the inner side surface of the reinforcing portion 5 has a circular structure, the inner side surface is arranged approximately parallel between the tangential direction of the central portion and the reference surface, and an included angle is formed between the tangential direction of the inner side surface of the non-central portion and the reference surface, and the included angle gradually increases from the central portion to the edge portion, that is, the inner side surface of the non-central portion has the largest included angle, that is, the first included angle α, at the edge portion.

Here, the first included angle α is set to 5 ° or more to increase the degree of bending of the reinforcing portion 5, and to improve the overall structural strength of the cover plate 2, thereby improving the impact resistance of the cover plate 2.

In one embodiment, the valve body 1 and the cover plate 2 are connected by riveting.

After the cover plate 2 is mounted to the mounting groove 101 of the valve body 1, the groove wall of the mounting groove 101 is riveted to the middle, riveting fixation of the cover plate 2 and the valve body 1 is achieved, the fixing effect is good, and the risk that the cover plate 2 is separated from the mounting groove 101 is reduced.

It should be noted herein that the solenoid valve shown in the drawings and described in the present specification is only one example employing the principles of the present utility model. It will be clearly understood by those of ordinary skill in the art that the principles of the present utility model are not limited to any details or any components of the devices shown in the drawings or described in the specification.

It should be understood that the utility model is not limited in its application to the details of construction and the arrangement of components set forth in the specification. The utility model is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications are intended to fall within the scope of the present utility model. It should be understood that the utility model disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present utility model. The embodiments described in this specification illustrate the best mode known for carrying out the utility model and will enable those skilled in the art to make and use the utility model.

Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.

It is to be understood that the utility model is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.

Claims (11)

1. A solenoid valve, comprising:

the valve body is provided with an inlet, an outlet and a mounting groove;

the cover plate is arranged in the mounting groove;

the piston is arranged in the valve body and positioned between the cover plate and the outlet, the piston comprises a main body guide section, a closed end and a tail end, a guide surface of the main body guide section and an inner cavity of the valve body form clearance fit, the outer diameter of the closed end is smaller than that of the main body guide section, the closed end is provided with a sealing plug, the piston is of a hollow structure, a piston cavity is formed in the piston, and a balance hole is further formed in the piston, so that the piston cavity is communicated with the outside of the piston;

the medium channel is arranged on the valve body, one end of the medium channel is communicated with the inlet through the inner cavity of the valve body, the other end of the medium channel is configured to be switched between a closed state and a conducting state and used for controlling the piston to slide relative to the valve body, so that the piston is selectively blocked at the outlet and used for opening and closing the outlet;

and the reinforcing part is at least partially arranged in the middle of the cover plate.

2. The electromagnetic valve according to claim 1, wherein the reinforcing portion is provided at a side of the cover plate facing the piston; and/or the number of the groups of groups,

the reinforcing part is arranged on one side of the cover plate away from the piston.

3. The electromagnetic valve according to claim 2, wherein the reinforcing portion is a protrusion protruding on a side surface of the cover plate.

4. The electromagnetic valve according to claim 2, wherein the maximum thickness of the reinforcing portion is D and the thickness of the cover plate is D in the axial direction of the piston;

wherein D+d is more than or equal to 1.1D.

5. The electromagnetic valve according to claim 2, wherein a thickness of the reinforcing portion at a central portion is greater than a thickness of the reinforcing portion at an edge portion in a radial direction of the piston.

6. The electromagnetic valve according to claim 5, wherein the thickness of the reinforcing portion gradually decreases from a middle portion of the reinforcing portion to the edge portion.

7. The electromagnetic valve according to claim 1, wherein a center portion of the cover plate near the inner side surface of the piston is recessed in a direction away from the piston, forming the reinforcing portion; or alternatively, the first and second heat exchangers may be,

the central portion of the cover plate, which is close to the inner side surface of the piston, protrudes toward the piston to form the reinforcing portion.

8. The electromagnetic valve according to claim 7, wherein an inner side surface of the cover plate, which is close to the piston, is in a circular arc structure, and a first included angle alpha is formed between a tangential direction of the inner side surface and a reference surface;

the reference surface is parallel to the end surface of the piston and perpendicular to the axial direction of the valve body.

9. The solenoid valve of claim 8 wherein said first included angle α is greater than or equal to 5 °.

10. The solenoid valve of any one of claims 1-9 wherein said cover plate and said reinforcement are of unitary construction.

11. A solenoid valve according to any one of claims 1 to 9 wherein said valve body and said cover plate are connected by riveting.