Solenoid valve

Abstract

The utility model provides an electromagnetic valve, which comprises a main valve body component, a main valve body component, a main valve body component, an electromagnetic valve component and a control component, and the main valve body component comprises a valve cavity and a main valve port which are communicated with each other, and the main valve port is arranged at one end of the valve cavity; the piston component is movably arranged in the valve cavity, the piston component is provided with a first end and a second end which are oppositely arranged in the moving direction, and the first end of the piston component is used for blocking or separating from the main valve port; the first buffer part is arranged on the main valve body part, and the first buffer part is arranged close to the second end of the piston part; after the first end of the piston component is separated from the main valve port, the piston component moves to the second end to abut against the first buffering part so as to buffer movement of the piston component. According to the scheme, the problem that in the prior art, when the piston component moves to the limiting position away from the main valve port, the end, away from the main valve port, of the piston component collides with the valve body component, and noise and vibration are generated can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, specifically, relate to a kind of solenoid valve. BACKGROUND

[0002] Solenoid valve is a kind of control fluid flow device. Solenoid valve usually includes main valve body component and piston component, main valve body component has valve cavity and main valve port intercommunicating, main valve port is arranged at one end of valve cavity, piston component is movably arranged in valve cavity, one end of piston component close to main valve port can block or separate from main valve port. When piston component moves in valve cavity, after one end of piston component close to main valve port separates from main valve port, solenoid valve is open valve state, but with the continuous sliding of piston component, one end of piston component away from main valve port will collide with one end of main valve body component away from main valve port, resulting in vibration and noise. SUMMARY

[0003] The utility model provides a kind of solenoid valve, to solve the problem that, when piston component in prior art moves to the limit position away from main valve port, one end of piston component away from main valve port will collide with valve body component, resulting in noise and vibration.

[0004] The utility model provides a kind of solenoid valve, solenoid valve includes: main valve body component, including intercommunicating valve cavity and main valve port, main valve port is arranged at one end of valve cavity;Piston component, movably arranged in valve cavity, piston component has first end and second end relatively arranged along the direction of movement, and the first end of piston component is used to block or separate from main valve port;First buffer part, it is arranged on main valve body component, and first buffer part is close to the second end of piston component setting;After the first end of piston component separates from main valve port, the second end of piston component is in abutment with first buffer part, to buffer the movement of piston component.

[0005] Further, main valve body component includes: body part, is provided with mounting port, valve cavity and main valve port, mounting port and main valve port are located at both ends of valve cavity along the direction of movement of piston component respectively;End cover, is installed at mounting port, and first buffer part is located on end cover.

[0006] Further, at least part of first buffer part protrudes towards the side surface of end cover towards piston component in the direction of piston component;Or, the end surface of first buffer part towards piston component is flush with the side surface of end cover towards piston component;Or, when the first end of piston component blocks main valve port, the interval between the end surface of first buffer part towards piston component and the end surface of second end of piston component is less than the interval between the side surface of end cover towards piston component and the end surface of second end of piston component.

[0007] Further, the side of the end cover facing the valve cavity is provided with a first groove, the first groove is communicated with the valve cavity, the first buffer part comprises a connecting end and an abutting end which are oppositely arranged along the moving direction of the piston part, the connecting end is arranged in the first groove, and the abutting end is used for abutting against the second end of the piston part.

[0008] Further, the end cover is provided with a riveting part, the riveting part is located at the side of the first groove close to the valve cavity, and the riveting part is in riveting cooperation with the first buffer part.

[0009] Further, the first buffer part comprises a first section and a second section which are sequentially connected along the moving direction of the piston part, the cross-sectional area of the first section is greater than that of the second section, the first section is embedded in the first groove, the second section is located at the side of the first groove facing the valve cavity, and the riveting part is in riveting cooperation with at least one of the first section and the second section.

[0010] Further, the side of the end cover facing the valve cavity is further provided with a second groove, along the radial direction of the end cover, the second groove is located at the outer side and / or the inner side of the first groove; the part of the end cover between the second groove and the first groove forms a protruding part, and / or the inner side of the second groove facing the valve cavity is provided with a protruding part; the protruding part is bent towards the first buffer part and forms the riveting part.

[0011] Further, the first buffer part is provided with a center hole, the center hole is arranged through the first buffer part along the thickness direction of the end cover.

[0012] Further, the end cover is further provided with a third groove, the third groove is located at the bottom of the first groove, the center hole is arranged through the first buffer part along the moving direction of the piston part, and the third groove is communicated with the valve cavity through the center hole.

[0013] Further, the first buffer part is in the form of a ring, and the first buffer part is used for abutting against the end face of the second end of the piston part.

[0014] Further, the piston part comprises: a piston body, a first end of the piston body is used for plugging or separating from the main valve port; and a second buffer part, the second buffer part is arranged on the second end of the piston body, and is used for abutting against the first buffer part after the first end of the piston body separates from the main valve port.

[0015] By arranging the first buffer part in the valve cavity of the electromagnetic valve, when the piston part moves to the limit position away from the main valve port, the contact between the second end of the piston part and the first buffer part replaces the direct collision between the second end of the piston part and the hard main valve body part, so that the noise caused by the collision is effectively reduced. Moreover, the introduction of the first buffer part can absorb the impact energy generated when the piston part moves rapidly through elastic or plastic deformation, so that the impact load on the piston part and the main valve body part is reduced, and the stability of the movement of the piston part is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated by reference in their entirety. The embodiments depicted herein are provided by way of example only, and together with the specification serve to explain the application. Together with the specification, the drawings serve to explain the application; included in the drawings are the following figures:

[0017] Figure 1 A cross-sectional view of the electromagnetic valve is shown;

[0018] Figure 2 A partial structure schematic view at A in the figure is shown. Figure 1

[0019] Wherein, the above-mentioned drawings include the following reference signs:

[0020] 10, main valve body part; 101, valve cavity; 102, main valve port; 103, first flow-through hole; 104, second flow-through hole; 105, pilot valve port; 106, communication passage;

[0021] 11, body part; 111, mounting port;

[0022] 12, end cover; 1201, first recess; 1202, second recess; 1203, third recess;

[0023] 121, riveting part;

[0024] 20, piston part; 201, piston cavity; 202, communication hole; 21, piston body;

[0025] 30, first buffer part; 31, first section; 32, second section; 3001, center hole;

[0026] 40, pilot valve body part;

[0027] 50, elastic part. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, and by no means constitutes any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0029] As Figure 1 and Figure 2 ​The utility model discloses an electromagnetic valve, which comprises a main valve body component 10, a piston component 20, a pilot valve body component 40 and an elastic component 50. The main valve body component 10 is provided with a valve cavity 101, a main valve port 102, a first flow-through hole 103, a second flow-through hole 104 and a pilot valve port 105 that are in communication with each other. The valve cavity 101, the main valve port 102 and the first flow-through hole 103 are coaxial and in communication in sequence. The axis of the pilot valve port 105 is perpendicular to the axis of the first flow-through hole 103, and the pilot valve port 105 is in communication with the first flow-through hole 103. The axis of the second flow-through hole 104 is perpendicular to the axis of the valve cavity 101, and the second flow-through hole 104 is in communication with the valve cavity 101. The pilot valve body component 40 is arranged at the pilot valve port 105 and is used to block or open the pilot valve port 105. The piston component 20 is movably arranged in the valve cavity 101 and has a first end and a second end arranged oppositely along the moving direction. The first end of the piston component 20 is used to block or disengage from the main valve port 102. When the first end of the piston component 20 blocks the main valve port 102, the first flow-through hole 103 and the second flow-through hole 104 are disconnected. When the first end of the piston component 20 disengages from the main valve port 102, the first flow-through hole 103 and the second flow-through hole 104 are connected.

[0030] One end of the piston component 20 away from the main valve port 102 is provided with a piston cavity 201, one end of the elastic component 50 is arranged in the piston cavity 201 and abuts against the piston component 20, the other end of the elastic component 50 abuts against the main valve body component 10, and the elastic component 50 is used to apply a force to the piston component 20 to block the main valve port 102. A communication hole 202 is further arranged on the side wall of the second end of the piston component 20 and penetrates the side wall of the piston component 20 in the radial direction.

[0031] The main valve body component 10 is provided with a communication passage 106 for communicating with the communication hole 202, the communication passage 106 is in communication with the piston cavity 201 through the communication hole 202, and when the pilot valve port 105 is opened, the pilot valve port 105 is in communication with the piston cavity 201 through the communication passage 106 and the communication hole 202.

[0032] Further, the electromagnetic valve further comprises a first buffer portion 30 arranged on the main valve body component 10, the first buffer portion 30 is arranged close to the second end of the piston component 20, after the first end of the piston component 20 disengages from the main valve port 102, the piston component 20 moves to the limit position away from the main valve port 102, and the second end of the piston component 20 abuts against the first buffer portion 30 to buffer the movement of the piston component 20. Specifically, the first buffer portion 30 is used to abut against the end face of the end of the piston component 20 away from the main valve port 102.

[0033] The technical scheme of the utility model, through setting first buffer part 30 in the valve cavity 101 of electromagnetic valve, when piston part 20 moves to the limit position far from main valve port 102, the contact of the second end of piston part 20 and first buffer part 30 replaces the direct collision of the second end of piston part 20 and hard main valve body part 10, thereby effectively reducing the noise generated by collision.

[0034] In some embodiments of the present scheme, at least part of the first buffer part 30 protrudes towards the side surface of the piston part 20.

[0035] In some other embodiments of the present scheme, the end surface of the first buffer part 30 towards the piston part 20 is flush with the side surface of the end cover 12 towards the piston part 20.

[0036] In some other embodiments of the present scheme, when the first end of the piston part 20 blocks the main valve port 102, the distance between the end surface of the first buffer part 30 towards the piston part 20 and the end surface of the second end of the piston part 20 is smaller than the distance between the side surface of the end cover 12 towards the piston part 20 and the end surface of the second end of the piston part 20.

[0037] Specifically, the main valve body part 10 comprises a body part 11 and an end cover 12 arranged separately. The body part 11 is provided with a mounting port 111, a valve cavity 101 and a main valve port 102, and the mounting port 111 and the main valve port 102 are respectively located at both ends of the valve cavity 101 along the moving direction of the piston part 20; the end cover 12 is mounted at the mounting port 111, and the first buffer part 30 is located on the end cover 12. In this way, the convenience of connecting the first buffer part 30 and the end cover 12 can be improved, and the difficulty of assembling the electromagnetic valve can be reduced.

[0038] In the embodiments of the present scheme, the side surface of the end cover 12 towards the valve cavity 101 is provided with a first groove 1201, the first groove 1201 is in communication with the valve cavity 101, and the first buffer part 30 comprises a connecting end and an abutting end arranged oppositely along the moving direction of the piston part 20. The connecting end of the first buffer part 30 is arranged in the first groove 1201, and the abutting end of the first buffer part 30 is used for abutting and buffering the second end of the piston part 20. The arrangement of the first groove 1201 can provide an accurate positioning point for the first buffer part 30, and ensure the stability of the connection between the first buffer part 30 and the end cover 12.

[0039] In some embodiments of the present application, the abutting end of the first buffer portion 30 extends towards the valve cavity 101 and is located in the valve cavity 101, so that at least part of the first buffer portion 30 protrudes towards the side surface of the end cover 12 towards the piston member 20.

[0040] In some other embodiments of the present application, the abutting end of the first buffer portion 30 is located in the first groove 1201 and is flush with the end surface of the end cover 12 towards the valve cavity 101.

[0041] In some other embodiments of the present application, the abutting end of the first buffer portion 30 is located in the first groove 1201, and the end surface of the abutting end has a spacing between the side surface of the end cover 12 towards the valve cavity 101, so that when the first end of the piston member 20 blocks the main valve port 102, the spacing between the end surface of the first buffer portion 30 towards the piston member 20 and the end surface of the second end of the piston member 20 is smaller than the spacing between the side surface of the end cover 12 towards the piston member 20 and the end surface of the second end of the piston member 20.

[0042] Further, the end cover 12 is provided with a riveting portion 121 located on the side of the first groove 1201 close to the valve cavity 101, and the riveting portion 121 is in riveting cooperation with the first buffer portion 30. The riveting cooperation between the riveting portion 121 and the first buffer portion 30 not only ensures the stable position of the first buffer portion 30 on the end cover 12, but also realizes quick assembly without additional fasteners and simplifies the production process through riveting.

[0043] In some embodiments of the present application, the first buffer portion 30 includes a first segment 31 and a second segment 32 connected in sequence along the moving direction of the piston member 20, the cross-sectional area of the first segment 31 is larger than that of the second segment 32, the first segment 31 is embedded in the first groove 1201, the second segment 32 is located on the side of the first groove 1201 towards the valve cavity 101, and the riveting portion 121 is in riveting cooperation with at least one of the first segment 31 and the second segment 32. The above-mentioned arrangement increases the stability of the first buffer portion 30 and improves the effect of absorbing impact energy of the first buffer portion 30.

[0044] Further, the end cover 12 is further provided with a second groove 1202 on the side facing the valve cavity 101, and the second groove 1202 is located on the outer side and / or inner side of the first groove 1201 along the radial direction of the end cover 12; the part of the end cover 12 between the second groove 1202 and the first groove 1201 forms a protruding part, and / or the inner side of the second groove 1202 facing the valve cavity 101 is provided with a protruding part; the protruding part is bent towards the first buffer part 30 and forms a riveting part 121. The above arrangement provides the necessary structural basis for the formation of the riveting part 121, that is, the protruding part is bent towards the first buffer part 30, and finally forms the riveting part 121. In this way, the convenience of forming the riveting part 121 can be improved, and the riveting part 121 is part of the end cover 12, which ensures that the end cover 12 is an integrally formed structure, and the structural strength of the end cover 12 is improved.

[0045] Specifically, the distance between the bottom of the first groove 1201 and the side of the end cover 12 away from the valve cavity 101 is less than the distance between the bottom of the second groove 1202 and the side of the end cover 12 away from the valve cavity 101. In this way, the formation of the riveting part 121 can be facilitated, and the processing of the end cover 12 can be facilitated.

[0046] In this scheme, at least one side of the inner side and the outer side of the first buffer part 30 is provided with a riveting part 121 along the radial direction of the end cover 12.

[0047] In the embodiment of the present scheme, the outer side and the inner side of the first buffer part 30 are respectively provided with a riveting part 121, and the part of the end cover 12 between the first groove 1201 and the second groove 1202 forms the riveting part 121. In this way, the stability of the riveting part 121 in fixing the first buffer part 30 can be further improved.

[0048] In the embodiment of the present scheme, the first buffer part 30 has a stepped structure, and the first buffer part 30 with the stepped structure can be more convenient for riveting with the riveting part 121.

[0049] Specifically, the protruding part on the outer side of the first buffer part 30 is bent towards the second section 32 of the first buffer part 30 and abuts against the middle part of the second section 32; the protruding part on the inner side of the first buffer part 30 is bent towards the second section 32 of the first buffer part 30 and abuts against the middle part of the second section 32. In this way, the end of the second section 32 away from the first section 31 is arranged to protrude from the riveting part 121 towards the piston part 20, which can ensure the abutting and buffering effect of the first buffer part 30 and the piston part 20.

[0050] Further, the first buffer portion 30 is provided with a central hole 3001 penetrating the first buffer portion 30 along the thickness direction of the end cover 12. The presence of the central hole 3001 provides an additional deformation space for the first buffer portion 30, so that when impacted by the second end of the piston member 20, the first buffer portion 30 can absorb and disperse the impact energy through local plastic deformation of the central hole 3001. This design improves the buffering effect and reduces the stress transmission to the end cover 12. Moreover, the above arrangement allows the first buffer portion 30 to absorb and disperse the impact force by elastic deformation when subjected to fluid pressure, thereby reducing the risk of the first buffer portion 30 being extruded out of the first groove 1201.

[0051] Further, the end cover 12 is further provided with a third groove 1203 located at the bottom of the first groove 1201, the central hole 3001 penetrates the first buffer portion 30 along the moving direction of the piston member 20, and the third groove 1203 communicates with the valve cavity through the central hole 3001. That is, the first end of the central hole 3001 extends to the end face of the first buffer portion 30 near the one end of the piston member 20, and the second end of the central hole 3001 communicates with the third groove 1203. After the fluid flows into the central hole 3001, the third groove 1203 can accommodate the fluid, providing a release space for the fluid in the central hole 3001, further reducing the possibility of the first buffer portion 30 being extruded out of the first groove 1201.

[0052] Further, in the present embodiment, one first groove 1201 and one first buffer portion 30 are provided, and the first groove 1201 and the first buffer portion 30 are coaxial annular structures; the first buffer portion 30 is coaxially arranged with the piston member 20, the shape of the first segment 31 of the first buffer portion 30 is adapted to the profile of the first groove 1201, and the end of the second segment 32 away from the first segment 31 is used to abut the end face of the second end of the piston member 20. By designing the first buffer portion 30 as an annular structure, a larger contact area can be provided when the first buffer portion 30 contacts the end face of the piston member 20, which helps to more evenly distribute the impact force transmitted by the piston member 20, so that the first buffer portion 30 more effectively absorbs and dissipates the impact energy generated by the movement of the piston member 20; and a larger contact area helps to reduce the local stress acting on the first buffer portion 30, avoiding material fatigue or damage caused by stress concentration. In addition, the annular first buffer portion 30 also has good symmetry and balance, increasing its stability in the first groove 1201 and increasing its stability when impacted.

[0053] Further, the two second grooves 1202 are annular structures coaxial with the first groove 1201 along the radial direction of the end cover 12, wherein the first second groove 1202 is located on the inner side of the first groove 1201, and the outer diameter of the second groove 1202 is smaller than the inner diameter of the first groove 1201; the second second groove 1202 is located on the outer side of the first groove 1201, and the inner diameter of the second groove 1202 is greater than the outer diameter of the first groove 1201.

[0054] In the embodiments of the present scheme, the central hole 3001 is provided in plurality, and the plurality of central holes 3001 are distributed along the circumferential direction of the first buffer portion 30. In this way, the deformation effect of the first buffer portion 30 can be further improved.

[0055] In some other embodiments of the present scheme, the first groove 1201 is provided in plurality, and the plurality of first grooves 1201 are distributed along the circumferential direction of the piston member 20, and each first groove 1201 is an arc-shaped structure, and each first groove 1201 extends along the circumferential direction of the piston member 20. One first buffer portion 30 is correspondingly arranged in each first groove 1201.

[0056] Further, the piston member 20 comprises a piston body 21 and a second buffer portion. The first end of the piston body 21 is used to block or disengage the main valve port 102; the second buffer portion is arranged on the second end of the piston body 21, and after the first end of the piston body 21 disengages the main valve port 102, the second buffer portion is used to abut against the first buffer portion 30. Through the cooperation of the second buffer portion and the first buffer portion 30, the vibration caused by the contact and collision between the second end of the piston member 20 and the end cover 12 is further reduced, and a double buffer effect is provided for the electromagnetic valve.

[0057] Specifically, the second buffer portion is an annular structure coaxial with the piston body 21, and the second end of the piston body 21 is provided with an assembly groove which is an annular structure coaxial with the piston body 21, and the second buffer portion is arranged in the assembly groove, and the end face of the end of the second buffer portion close to the first buffer portion 30 is flush with the end face of the second end of the piston body 21. In this way, the second buffer portion is coaxial with the first buffer portion 30, the contact area between the second buffer portion and the first buffer portion 30 is increased, and the buffer effect is further improved.

[0058] It is to be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the example embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0059] The foregoing description, for purposes of explanation, sets forth specific values and arrangements of components and steps that are subject to many options. The intent is to be accurate in describing the principles and novel features of the application. As such, the foregoing is not to be taken in a limiting sense, but is made merely for the purpose of providing some examples of the application. Other examples of the inventive concept can have different values and / or arrangements of the components and steps. It is noted that like references and descriptions set forth herein (distinguishing between that which is the same and that which is different) should be understood to be applicable to any analogous processes, machines, and articles of manufacture, wherever and whenever described, unless otherwise stated. In all instances, the inventive concept should be understood to encompass all such possible modifications and variations.

[0060] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0061] For the convenience of description, spatial relative terms such as "on", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0062] In addition, it should be noted that the use of the words "first", "second" and the like to define parts of components is only for the convenience of distinguishing the corresponding parts of components, and the above words have no special meaning unless otherwise stated, therefore, it cannot be understood as a limitation on the scope of protection of the present application.

[0063] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electromagnetic valve characterized by comprising: The electromagnetic valve comprises: a main valve body component (10) comprising a valve cavity (101) and a main valve port (102) in communication with each other, the main valve port (102) being arranged at one end of the valve cavity (101); a piston component (20) movably arranged in the valve cavity (101), the piston component (20) having a first end and a second end arranged oppositely along a moving direction of the piston component (20), the first end of the piston component (20) being used for blocking or unblocking the main valve port (102); a first buffer portion (30) arranged on the main valve body component (10), the first buffer portion (30) being arranged close to the second end of the piston component (20); after the first end of the piston component (20) unblocks the main valve port (102), the second end of the piston component (20) abuts against the first buffer portion (30) to buffer the movement of the piston component (20).

2. The electromagnetic valve according to claim 1, characterized by The main valve body component (10) comprises: a body portion (11) provided with a mounting port (111), the valve cavity (101) and the main valve port (102), the mounting port (111) and the main valve port (102) being respectively arranged at two ends of the valve cavity (101) along the moving direction of the piston component (20); an end cover (12) mounted at the mounting port (111), the first buffer portion (30) being arranged on the end cover (12).

3. The electromagnetic valve according to claim 2, characterized by At least part of the first buffer portion (30) protrudes towards the piston component (20) from a side surface of the end cover (12) facing the piston component (20); or, an end surface of the first buffer portion (30) facing the piston component (20) is flush with the side surface of the end cover (12) facing the piston component (20); or, when the first end of the piston component (20) blocks the main valve port (102), a distance between the end surface of the first buffer portion (30) facing the piston component (20) and an end surface of the second end of the piston component (20) is smaller than a distance between the side surface of the end cover (12) facing the piston component (20) and the end surface of the second end of the piston component (20).

4. The electromagnetic valve according to claim 2, characterized by The end cover (12) is provided with a first groove (1201) on a side surface thereof facing the valve cavity (101), the first groove (1201) being in communication with the valve cavity (101), the first buffer portion (30) comprising a connecting end and an abutting end arranged oppositely along the moving direction of the piston component (20), the connecting end being arranged in the first groove (1201), and the abutting end being used for abutting against the second end of the piston component (20) to buffer.

5. The electromagnetic valve according to claim 4, characterized by The end cover (12) is provided with a riveting portion (121) arranged on the first groove (1201) close to the valve cavity (101), the riveting portion (121) being in riveting cooperation with the first buffer portion (30).

6. The electromagnetic valve according to claim 5, characterized by The first buffer part (30) comprises a first section (31) and a second section (32) connected in sequence along the moving direction of the piston part (20), the cross-sectional area of the first section (31) is larger than that of the second section (32), the first section (31) is embedded in the first groove (1201), the second section (32) is located on the side of the first groove (1201) facing the valve cavity (101), and the riveting part (121) is riveted with at least one of the first section (31) and the second section (32).

7. The electromagnetic valve according to claim 5, wherein The side of the end cover (12) facing the valve cavity (101) is also provided with a second groove (1202), and along the radial direction of the end cover (12), the second groove (1202) is located outside and / or inside the first groove (1201); The part of the end cover (12) between the second groove (1202) and the first groove (1201) forms a protruding part, and / or a protruding part is arranged on the inner side of the second groove (1202) facing the valve cavity (101); the protruding part is bent towards the first buffer part (30) and forms the riveting part (121).

8. The electromagnetic valve according to claim 4, characterized by The first buffer part (30) is provided with a center hole (3001), and the center hole (3001) penetrates the first buffer part (30) along the thickness direction of the end cover (12).

9. The electromagnetic valve according to claim 8, characterized by The end cover (12) is also provided with a third groove (1203), and the third groove (1203) is located at the bottom of the first groove (1201), the center hole (3001) penetrates the first buffer part (30) along the moving direction of the piston part (20), and the third groove (1203) communicates with the valve cavity (101) through the center hole (3001).

10. The electromagnetic valve according to claim 1, characterized by The first buffer part (30) is annular in structure, and the first buffer part (30) is used to abut against the end face of the second end of the piston part (20).

11. The electromagnetic valve according to claim 1, characterized by The piston part (20) comprises: a piston body (21), a first end of the piston body (21) is used to block or separate from the main valve port (102); a second buffer part arranged on the second end of the piston body (21), after the first end of the piston body (21) separates from the main valve port (102), the second buffer part is used to abut against the first buffer part (30).

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