Solenoid valve

Abstract

The utility model provides an electromagnetic valve which comprises a valve body, a valve core and a valve core, at least one part of the first iron core is arranged in the accommodating cavity; at least one part of the second iron core is arranged in the accommodating cavity, and the second iron core can move relative to the first iron core; the reset spring is located between the first iron core and the second iron core; and the buffer structure is movably arranged on the reset spring in a sleeving mode and located between the second iron core and the first iron core. By the adoption of the scheme, when the first iron core and the second iron core are attracted, the buffer structure is arranged between the first iron core and the second iron core, the buffer structure buffers movement of the second iron core, and overlarge impact of the first iron core and the second iron core is avoided. And the reset spring guides the buffer structure, so that the buffer structure is prevented from deviating, and the buffer structure is more convenient and quicker to mount. According to the scheme, the problem that the installation process of the buffer structure of the electromagnetic valve is complex is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a solenoid valve. Background Art

[0002] In some solenoid valves, a first iron core and a second iron core are provided. After the solenoid valve is energized, the first iron core and the second iron core are attracted to or separated from each other under the action of electromagnetic force to realize the opening and closing of the solenoid valve. At the moment when the first iron core and the second iron core are attracted, a large attraction noise is generated due to the impact. The noise affects the working environment, and the impact force of the second iron core and the first iron core is relatively large. In order to buffer the attraction of the first iron core and the second iron core and reduce the impact noise of the attraction of the first iron core and the second iron core, a buffer structure is provided between the first iron core and the second iron core. The buffer structure in the prior art is fixedly connected to the first iron core or the second iron core to set the buffer structure between the first iron core and the second iron core, which makes the installation process of the buffer structure more complicated. Therefore, there is a need for a solenoid valve that can simplify the installation process of the buffer structure and make the installation of the buffer structure more convenient and quick. Utility Model Content

[0003] The utility model provides a solenoid valve to solve the problem of complex installation process of the buffer structure of the solenoid valve in the prior art.

[0004] In order to solve the above problems, the utility model provides a solenoid valve, comprising:

[0005] A valve body having an accommodating cavity;

[0006] a first iron core, at least a portion of the first iron core being disposed in the accommodating cavity;

[0007] a second core, at least a portion of which is disposed in the accommodating cavity, and the second core is movable relative to the first core;

[0008] a return spring, the return spring being located between the first iron core and the second iron core;

[0009] The buffer structure is movably sleeved on the return spring and is located between the second iron core and the first iron core.

[0010] Furthermore, the buffer structure is located at the end of the second core facing the first core, and at least a portion of the buffer structure protrudes from the end surface of the second core.

[0011] Furthermore, the return spring has a first parallel coil section that cannot be compressed, the buffer structure is sleeved on the first parallel coil section, and the length of the first parallel coil section along the axial direction of the solenoid valve is greater than the length of the buffer structure along the axial direction of the solenoid valve, and the first parallel coil section is arranged at one end of the return spring.

[0012] Furthermore, the return spring has a second coil section that cannot be compressed, the length of the second coil section along the axial direction of the solenoid valve is greater than the length of the buffer structure along the axial direction of the solenoid valve, and the second coil section is located at the end of the return spring away from the first coil section.

[0013] Furthermore, the buffer structure is an O-ring, and the material of the O-ring is plastic or rubber; or,

[0014] The buffer structure is an annular pad, the cross section of the annular pad along the axial direction of the solenoid valve is non-circular, and the material of the annular pad is plastic or rubber.

[0015] Furthermore, a first mounting hole is provided at one end of the second iron core close to the first iron core, and the end of the return spring close to the second iron core is installed in the first mounting hole. The diameter of the first mounting hole is larger than the outer diameter of the return spring, and the diameter of the first mounting hole is smaller than the outer diameter of the buffer structure.

[0016] Furthermore, the valve body includes a valve seat, a valve cover and a sleeve connected in sequence, the valve seat has a first chamber, the sleeve has a second chamber, and the first chamber and the second chamber form an accommodating chamber;

[0017] The valve cover has a limiting hole, and the sleeve is arranged through the limiting hole. The end of the sleeve away from the first iron core has a welding section, which is a straight tube. The welding section is interference fit with the limiting hole and is laser welded.

[0018] Furthermore, the sleeve also includes a transition section that is not arranged parallel to the axis of the solenoid valve, and the transition section is connected to one end of the welding section close to the first iron core; the limiting hole has an inclined section that is arranged parallel to the transition section, the minimum inner diameter of the inclined section is smaller than the inner diameter of the welding section, and the transition section and the inner wall of the inclined section are limited and matched.

[0019] Furthermore, the solenoid valve further includes a valve needle portion, the valve needle portion includes a piston, and the piston is movably disposed in the accommodating chamber; the valve body has a fluid input channel, a fluid output channel, and a main valve port for connecting the fluid input channel and the fluid output channel; the piston is in sealing engagement with the main valve port; the piston has a pilot valve port, and the pilot valve port is in communication with the fluid output channel;

[0020] The valve needle part also includes a valve needle. The second iron core has a second mounting hole at one end away from the first iron core, and the valve needle is movably arranged in the second mounting hole; the valve needle is sealed with the guide valve port; the maximum distance that the valve needle moves relative to the second iron core is L, the thickness of the buffer structure is M, and the maximum distance between the first iron core and the second iron core is H, HL≥M.

[0021] Furthermore, the valve needle includes a first section and a second section that are connected to each other, the diameter of the first section is larger than the diameter of the second section, a limiting structure is provided between the valve needle and the second iron core, the valve needle moves between the limiting structure and the bottom wall of the second mounting hole, the first section has a clamping surface at one end close to the second section, the limiting structure has a limiting surface at one end close to the first iron core, and the maximum distance between the limiting surface and the clamping surface is L.

[0022] The technical solution of the present utility model provides a solenoid valve, comprising: a valve body having a receiving cavity; a first iron core, at least a portion of which is disposed within the receiving cavity; a second iron core, at least a portion of which is disposed within the receiving cavity and movable relative to the first iron core; a return spring, located between the first and second iron cores; and a buffer structure, movably mounted on the return spring and located between the second iron core and the first iron core. When the first and second iron cores are engaged, the buffer structure separates the second and first iron cores. With this solution, the buffer structure does not need to be fixedly connected to either the first or second iron core, making installation of the buffer structure more convenient and quick. When the first and second iron cores are engaged, the buffer structure is located between the first and second iron cores, buffering the movement of the second iron core and preventing excessive impact on the first and second iron cores. Furthermore, the buffer structure moves along the length of the return spring, allowing the return spring to guide the buffer structure and prevent it from shifting. This solution solves the problem of complex installation of the buffer structure in solenoid valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A schematic structural diagram of a solenoid valve provided in an embodiment of the present utility model is shown;

[0025] Figure 2 Shown Figure 1 Cross-sectional view at AA in FIG;

[0026] Figure 3 Shown Figure 2 A partial enlarged view of point B in the middle;

[0027] Figure 4 Shown Figure 2 A partial enlarged view of point C in the middle.

[0028] The above drawings include the following reference numerals:

[0029] 10. Valve body;

[0030] 101. Accommodating chamber; 102. Main valve port;

[0031] 11. Valve seat;

[0032] 12. Valve cover;

[0033] 13. Casing; 131. Welding section; 132. Transition section;

[0034] 20. First iron core;

[0035] 30. Second core;

[0036] 31. First mounting hole; 32. Second mounting hole;

[0037] 40. Valve needle;

[0038] 41, valve needle; 42, piston; 421, pilot valve port;

[0039] 50. Return spring; 51. First coil section;

[0040] 60. Buffer structure;

[0041] 70. Limiting structure. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way serves as any limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0043] like Figures 1 to 4 As shown, an embodiment of the present invention provides a solenoid valve, comprising a valve body 10, a first iron core 20, a second iron core 30, a return spring 50, and a buffer structure 60. The valve body 10 has a receiving cavity 101; at least a portion of the first iron core 20 is disposed within the receiving cavity 101; at least a portion of the second iron core 30 is disposed within the receiving cavity 101, and the second iron core 30 is movable relative to the first iron core 20; one of the second iron core 30 and the first iron core 20 is a stationary iron core and is stationary, while the other is a movable iron core and is movable. Alternatively, both the second iron core 30 and the first iron core 20 are movable. One end of the return spring 50 is connected to the first iron core 20, and the other end of the return spring 50 is connected to the second iron core 30; the buffer structure 60 is movably mounted on the return spring 50 and is located between the second iron core 30 and the first iron core 20.

[0044] With this solution, the buffer structure 60 is movably arranged, and the buffer structure 60 does not need to be fixedly connected to the first iron core 20, nor does it need to be fixedly connected to the second iron core 30, making the installation of the buffer structure 60 more convenient and quick. When the first iron core 20 and the second iron core 30 are attracted, the buffer structure 60 is arranged between the first iron core 20 and the second iron core 30, and the buffer structure 60 buffers the movement of the second iron core 30 to avoid excessive impact on the first iron core 20 and the second iron core 30. The buffer structure 60 moves along the length direction of the return spring 50, so that the return spring 50 guides the buffer structure 60 to avoid the buffer structure 60 from being offset. Through this solution, the problem of complex installation process of the buffer structure 60 of the solenoid valve is solved.

[0045] like Figure 3 As shown, the buffer structure 60 is located at the end of the second core 30 facing the first core 20 , and at least a portion of the buffer structure 60 protrudes from the end surface of the second core 30 .

[0046] In this arrangement, at least part of the buffer structure 60 protrudes from the end surface of the second core 30, so that the buffer structure 60 can separate the first core 20 and the second core 30, and buffer the impact of the first core 20 and the second core 30 being attracted to each other, thereby avoiding impact noise.

[0047] Furthermore, if Figure 2 As shown, the return spring has a first parallel coil section 51 that cannot be compressed, the buffer structure is sleeved on the first parallel coil section 51, and the length of the first parallel coil section 51 along the axial direction of the solenoid valve is greater than the length of the buffer structure 60 along the axial direction of the solenoid valve, and the first parallel coil section 51 is arranged at one end of the return spring 50.

[0048] In this arrangement, the first coil segment 51 cannot be compressed, and the length of the first coil segment 51 is greater than the thickness of the buffer structure 60, so that when the first iron core 20 and the second iron core 30 are attracted, the return spring 50 is compressed, and the gap between the first iron core 20 and the second iron core 30 is reduced to the thickness of the buffer structure 60, the first coil segment 51 guides the buffer structure 60 axially. Since the first coil segment 51 cannot be compressed, the buffer structure 60 will not be stuck in the return spring 50.

[0049] Furthermore, the return spring 50 has a second coil section that cannot be compressed, the length of the second coil section along the axial direction of the solenoid valve is greater than the length of the buffer structure 60 along the axial direction of the solenoid valve, and the second coil section is located at the end of the return spring 50 away from the first coil section 51.

[0050] In this embodiment, the second parallel coil section cannot be compressed. Its length is greater than the thickness of the buffer structure 60, preventing the buffer structure 60 from becoming stuck in the return spring 50. The first and second parallel coil sections 51 and 52 are disposed at either end of the return spring 50, eliminating the need to determine the orientation of the return spring 50 during installation, resulting in quick and convenient installation.

[0051] Furthermore, in a specific embodiment of the present invention, the buffer structure 60 is an O-ring, and the material of the O-ring is plastic or rubber; or,

[0052] The buffer structure 60 is an annular gasket, the cross section of which along the axial direction of the solenoid valve is non-circular, and the material of the annular gasket is plastic or rubber.

[0053] It is understandable that the buffer structure 60 can be designed with different materials and different structures, so that a more suitable buffer structure 60 can be selected according to the use process of the solenoid valve. The preferred embodiment of the buffer structure 60 is an O-ring or an annular gasket. The cross-section of the O-ring along the axial direction of the solenoid valve is circular, and the O-ring can separate the first iron core 20 and the second iron core 30, and buffer the impact of the first iron core 20 and the second iron core 30 being attracted. The cross-section of the annular gasket along the axial direction of the solenoid valve is non-circular, and the annular gasket can separate the first iron core 20 and the second iron core 30, and buffer the impact of the first iron core 20 and the second iron core 30 being attracted.

[0054] like Figure 2 As shown, a first mounting hole 31 is provided at one end of the second iron core 30 close to the first iron core 20, and the end of the return spring 50 close to the second iron core 30 is installed in the first mounting hole 31, and the diameter of the first mounting hole 31 is larger than the outer diameter of the return spring 50, and the diameter of the first mounting hole 31 is smaller than the outer diameter of the buffer structure 60.

[0055] It should be noted that the first mounting hole 31 is used to mount the return spring 50. The diameter of the first mounting hole 31 is larger than the outer diameter of the return spring 50, allowing the return spring 50 to fit into the first mounting hole 31. The diameter of the first mounting hole 31 is smaller than the outer diameter of the buffer structure 60 to prevent the buffer structure 60 from falling into the first mounting hole 31.

[0056] like Figure 2 As shown, the valve body 10 includes a valve seat 11, a valve cover 12 and a sleeve 13 connected in sequence. The valve seat 11 has a first chamber, the sleeve 13 has a second chamber, and the first chamber and the second chamber form a accommodating chamber 101; the valve cover 12 has a limiting hole, and the sleeve 13 is arranged through the limiting hole. The end of the sleeve 13 away from the first iron core 20 has a welding section 131, and the welding section 131 is a straight tube. The limiting hole includes a straight section corresponding to the welding section 131, and the welding section 131 is interference fit with the inner wall of the straight section of the limiting hole and is laser welded.

[0057] In this embodiment, the valve seat 11, valve cover 12, and sleeve 13 are sequentially connected to form the valve body 10. The first chamber of the valve seat 11 and the second chamber of the sleeve 13 form the accommodating chamber 101. Laser welding requires close contact between the welded parts. The welding section 131 is interference-fitted with the limiting hole, ensuring a close fit. The sleeve 13 is then fixedly connected to the valve cover 12 by laser welding the welding section 131 to the inner wall of the limiting hole.

[0058] like Figure 2 As shown, the sleeve 13 also includes a transition section 132 that is not parallel to the axis of the solenoid valve, and the transition section 132 is connected to one end of the welding section 131 close to the first iron core 20; the limiting hole has an inclined section that is parallel to the transition section 132, and the minimum inner diameter of the inclined section is smaller than the inner diameter of the welding section 131, and the transition section 132 is limitedly matched with the inner wall of the inclined section.

[0059] With the above arrangement, the minimum inner diameter of the inclined section is smaller than the inner diameter of the welding section 131 , and the transition section 132 cooperates with the inner wall of the inclined section to prevent the welding section 131 from passing through the limiting hole, thereby realizing axial limiting of the sleeve 13 by the valve cover 12 .

[0060] like Figure 2 As shown, the solenoid valve further includes a valve needle portion 40, which includes a piston 42. The piston 42 is movably disposed in the accommodating chamber 101. The valve body 10 has a fluid input channel, a fluid output channel, and a main valve port 102 for connecting the fluid input channel and the fluid output channel. The piston 42 is in sealing engagement with the main valve port 102. The piston 42 has a pilot valve port 421, which is in communication with the fluid output channel.

[0061] The valve needle portion 40 includes a valve needle 41. The second iron core 30 has a second mounting hole 32 at one end away from the first iron core 20. The valve needle 41 is at least partially movably arranged in the second mounting hole 32; the valve needle 41 is sealed and matched with the guide valve port 421; the maximum distance that the valve needle 41 moves relative to the second iron core 30 is L, the thickness of the buffer structure 60 is M, and the maximum distance between the first iron core 20 and the second iron core 30 is H, HL≥M.

[0062] With this arrangement, piston 42 is movably disposed within accommodating chamber 101, cooperating with valve needle 41 to open and close the solenoid valve. The maximum displacement of valve needle 41 relative to second core 30 is L, and the gap between first core 20 and second core 30 is H. If HL is less than M, first core 20 and second core 30 will not engage smoothly. By ensuring HL ≥ M, smooth engagement of first core 20 and second core 30 is ensured.

[0063] Furthermore, the valve needle 41 includes a first section and a second section that are connected to each other, the diameter of the first section is larger than the diameter of the second section, a limiting structure 70 is arranged between the valve needle 41 and the second iron core 30, and the valve needle moves between the limiting structure and the bottom wall of the second mounting hole. The first section has a clamping surface at one end close to the second section, and the limiting structure 70 has a limiting surface at the end facing away from the piston 42. The maximum distance between the limiting surface and the clamping surface is L, that is, the maximum distance between the limiting surface and the clamping surface is the maximum distance that the valve needle 41 moves relative to the second iron core 30.

[0064] With this arrangement, the valve needle 41 is movably disposed within the second mounting hole 32, and the limiting structure 70 limits the first section of the valve needle 41, thereby restricting the displacement of the valve needle 41 within the second mounting hole 32. When the pilot valve port 421 is closed, the second core 30 moves toward the first core 20, but the valve needle 41 remains stationary, closing the pilot valve port 421. After the second core 30 moves a distance L, the second core 30 drives the valve needle 41 to move simultaneously.

[0065] The advantages of this solution are:

[0066] 1. By providing a buffer structure 60 between the second core 30 and the first core 20, the impact of the first core 20 and the second core 30 being attracted is absorbed and buffered by the buffer structure 60, thereby preventing excessive noise from the attraction of the first core 20 and the second core 30, which would affect the working environment. The buffer structure 60 is a movable part, which is easy to install.

[0067] 2. A first parallel coil section 51 is provided at the end of the return spring 50, and the buffer structure 60 is sleeved outside the first parallel coil section 51. The first parallel coil section 51 can prevent the buffer structure 60 from getting stuck in the return spring 50 during the attraction process between the first iron core 20 and the second iron core 30. In addition, the first parallel coil section 51 and the second parallel coil section are provided at both ends of the return spring 50, making the assembly of the return spring 50 simpler and saving installation time.

[0068] 3. The end of the sleeve 13 close to the valve seat 11 has a welding section 131. The welding section 131 is a straight tube, which is more convenient to assemble. The welding section 131 and the limiting hole of the valve cover 12 have an interference fit, so that the outer wall of the welding section 131 and the inner wall of the limiting hole fit tightly together. Laser welding is used to weld the welding section 131 to the limiting hole, thereby achieving a fixed connection between the valve cover 12 and the sleeve 13.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0072] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0073] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0074] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

Claims

1. A solenoid valve, characterized in that: include: A valve body (10) having an accommodating cavity (101); a first iron core (20), at least a portion of the first iron core (20) being disposed in the accommodating cavity (101); a second iron core (30), at least a portion of the second iron core (30) being disposed in the accommodating cavity (101), and the second iron core being movable relative to the first iron core; a return spring (50), the return spring (50) being located between the first iron core (20) and the second iron core (30); A buffer structure (60) is movably sleeved on the return spring (50) and located between the second iron core (30) and the first iron core (20).

2. The solenoid valve according to claim 1, characterized in that The buffer structure (60) is located at the end of the second iron core (30) facing the first iron core (20), and at least a portion of the buffer structure (60) protrudes from the end surface of the second iron core (30).

3. The solenoid valve according to claim 1, characterized in that The return spring (50) has a first parallel coil section (51) that cannot be compressed, the buffer structure (60) is sleeved on the first parallel coil section (51), and the length of the first parallel coil section (51) along the axial direction of the solenoid valve is greater than the length of the buffer structure (60) along the axial direction of the solenoid valve, and the first parallel coil section (51) is arranged at one end of the return spring (50).

4. The solenoid valve according to claim 3, characterized in that The return spring (50) has a second parallel coil section that cannot be compressed, the length of the second parallel coil section along the axial direction of the solenoid valve is greater than the length of the buffer structure (60) along the axial direction of the solenoid valve, and the second parallel coil section is located at an end of the return spring (50) away from the first parallel coil section (51).

5. The solenoid valve according to claim 1, characterized in that The buffer structure (60) is an O-ring, and the material of the O-ring is plastic or rubber; or, The buffer structure (60) is an annular pad, the annular pad has a non-circular cross section along the axial direction of the solenoid valve, and the material of the annular pad is plastic or rubber.

6. The solenoid valve according to claim 1, characterized in that A first mounting hole (31) is provided at one end of the second iron core (30) close to the first iron core (20), and the end of the return spring (50) close to the second iron core (30) is mounted in the first mounting hole (31), the diameter of the first mounting hole (31) is larger than the outer diameter of the return spring (50), and the diameter of the first mounting hole (31) is smaller than the outer diameter of the buffer structure (60).

7. The solenoid valve according to claim 1, characterized in that The valve body (10) comprises a valve seat (11), a valve cover (12) and a sleeve (13) connected in sequence, the valve seat (11) having a first chamber, the sleeve (13) having a second chamber, and the first chamber and the second chamber forming the accommodating chamber (101); The valve cover (12) has a limiting hole, the sleeve (13) is arranged through the limiting hole, and the sleeve (13) has a welding section (131) at one end away from the first iron core (20), the welding section (131) is a straight tube, and the welding section (131) is interference-fitted with the limiting hole and laser-welded.

8. The solenoid valve according to claim 7, characterized in that The sleeve (13) further includes a transition section (132) that is not arranged parallel to the axis of the solenoid valve, and the transition section (132) is connected to an end of the welding section (131) close to the first iron core (20); the limiting hole has an inclined section that is arranged parallel to the transition section (132), the minimum inner diameter of the inclined section is smaller than the inner diameter of the welding section (131), and the transition section (132) is limitedly matched with the inner wall of the inclined section.

9. The solenoid valve according to claim 1, characterized in that The solenoid valve further comprises a valve needle portion (40), the valve needle portion (40) comprising a piston (42), the piston (42) being movably disposed in the accommodating chamber (101); the valve body (10) comprising a fluid input channel, a fluid output channel, and a main valve port (102) for connecting the fluid input channel and the fluid output channel; the piston (42) is in sealing engagement with the main valve port (102); the piston (42) comprises a pilot valve port (421), the pilot valve port (421) being in communication with the fluid output channel; The valve needle portion (40) further comprises a valve needle (41); an end of the second iron core (30) away from the first iron core (20) comprises a second mounting hole (32); the valve needle (41) is at least partially movably disposed in the second mounting hole (32); the valve needle (41) is in sealing engagement with the pilot valve port (421); a maximum distance that the valve needle (41) can move relative to the second iron core (30) is L, a thickness of the buffer structure (60) is M, and a maximum distance between the first iron core (20) and the second iron core (30) is H. HL≥M.

10. The solenoid valve according to claim 9, characterized in that The valve needle (41) includes a first section and a second section connected to each other, the diameter of the first section is larger than the diameter of the second section, a limiting structure (70) is provided between the valve needle (41) and the second iron core (30), the valve needle (41) moves between the limiting structure (70) and the bottom wall of the second mounting hole (32), the first section has a clamping surface at one end close to the second section, the limiting structure (70) has a limiting surface at one end close to the first iron core (20), and the maximum distance between the limiting surface and the clamping surface is the L.

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