Rigidity valve

Abstract

The rigidity valve comprises a coil component, a mandrel, a sealing component, a valve seat, core iron and a sealing head component, the core iron and the sealing head component are matched, the two ends of the mandrel are connected with the core iron and the sealing component respectively, a valve port is formed in the valve seat, and the sealing component is used for opening and closing the valve port; the end socket part comprises an end socket part and a fixing seat, the end socket part comprises a through hole penetrating in the axial direction, the mandrel penetrates through the through hole, and the end socket part is fixedly connected with the fixing seat or is in limiting connection with the fixing seat in the axial direction; at least part of the core iron and at least part of the end socket part are distributed in an inner hole of the coil component in the axial direction, and the fixing seat is located between the coil component and the valve seat in the axial direction. The seal head part of the rigidity valve is relatively simple to process and relatively low in processing cost.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to a stiffness valve. Background Technology

[0002] like Figure 9 As shown, Figure 9 This is a structural schematic diagram of a stiffness valve.

[0003] The rigidity valve includes a core iron 01, an end cap 02, a sealing block 03, a spring 04, a spindle 05, a valve seat 07, a coil assembly 08, and a sealing assembly 06. The sealing assembly 06 includes a support member 061 and a rubber member 062. When the coil assembly 08 is de-energized, the core iron 01 drives the spindle 05 upward under the action of the spring 04, which in turn moves the sealing block 03 away from the valve port, opening the valve port. When the coil assembly 08 is energized, the core iron 01 and the end cap 02 attract each other, the core iron 01 moves downward, and the spindle 05 drives the sealing block 03 closer to the valve port and seals the valve port, thus closing the rigidity valve. The end cap 02 of this structure is complex, and its processing difficulty and cost are relatively high. Summary of the Invention

[0004] The purpose of this application is to provide a rigidity valve with a simpler and lower processing cost for the end cap.

[0005] This application provides a stiffness valve, including a coil component, a spindle, a sealing component, a valve seat, and a cooperating core iron and a head component. The two ends of the spindle are respectively connected to the core iron and the sealing component. The valve seat is provided with a valve port, and the sealing component is used to open and close the valve port.

[0006] The end cap component includes an end cap head and a fixing seat. The end cap head includes a through hole extending axially. The mandrel passes through the through hole. The end cap head and the fixing seat are fixedly connected or axially limited. At least a portion of the core iron and at least a portion of the end cap head are distributed axially in the inner hole of the coil component. The fixing seat is located axially between the coil component and the valve seat.

[0007] In this application, the rigid valve head and the fixed seat are two independently configured components. The fixed seat is located axially between the valve seat and the coil component to restrict the axial movement of the head, serving as a stationary iron core. At least a portion of the head is disposed within the inner hole of the coil component to engage with the core iron. This configuration allows the head and fixed seat to be machined from two materials with different outer diameters, reducing waste and saving material costs compared to the head structure in the prior art. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the stiffness valve in an embodiment of this application;

[0009] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0010] Figure 3 for Figure 1 A schematic diagram of the assembly of the center seal head and the fixing base;

[0011] Figure 4 for Figure 3 Schematic diagram of the structure of the center seal head;

[0012] Figure 5 for Figure 3 Schematic diagram of the middle fixed seat;

[0013] Figure 6 for Figure 2 Enlarged view of section C;

[0014] Figure 7 for Figure 2 Enlarged view of part B in the middle;

[0015] Figure 8 This is a schematic diagram of the air spring in an embodiment of this application;

[0016] Figure 9 This is a structural schematic diagram of a stiffness valve.

[0017] The reference numerals in the above figures are explained as follows:

[0018] 100-Stiffness Valve;

[0019] 1. End cap assembly; 11-Terminal connector; 12-End cap body;

[0020] 2. Magnetic outer shell; 21-Ninth step surface;

[0021] 3-Coil component; 31-Coil winding; 32-Coil bobbin; 321-First annular flange; 322-Eighth stepped surface;

[0022] 4-End cap component; 41-End cap head; 41a-Through hole; 41a1-First hole section; 41a2-Second hole section; 41a3-Third hole section; 411-First stepped surface; 412-Second stepped surface; 413-Third stepped surface; 414-Extension; 4141-Lower end face; 415-End cap body; 416-Bottom of hole; 42-Fixing seat; 421-Fourth stepped surface; 422-Ceiling surface;

[0023] 5-Valve seat; 51-Seventh step surface; 52-Tenth step surface; 53-Eleventh step surface; 5a-Valve port;

[0024] 6-Sealing assembly; 61-First sealing ring; 611-Sealing lip; 62-Second sealing ring; 63-Guide sleeve; 631-Annular protrusion; 6311-Fifth step surface; 6312-Sixth step surface; 63a-Groove;

[0025] 7-Third sealing ring;

[0026] 81-Sealing component; 82-Mandrel; 83-Core iron; 84-Spring; 85-Buffer pad;

[0027] 9-Casing;

[0028] 200 - Empty spring; 200a - Main cavity; 200b - Secondary cavity; 2001 - Outer sac skin; 2002 - Inner cavity wall;

[0029] 01-Core iron, 02-End cap, 03-Sealing block, 04-Spring, 05-Mandrel, 06-Sealing assembly, 061-Support component, 062-Rubber component, 07-Valve seat, 08-Coil component. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Please refer to Figures 1 to 3 , Figure 1 This is a schematic diagram of the stiffness valve 100 in the embodiments of this application; Figure 2 for Figure 1 Enlarged view of part A in the middle; Figure 3 for Figure 1 A schematic diagram of the assembly of the central sealing head 41 and the fixing base 42; Figure 4 for Figure 3 Schematic diagram of the structure of the middle sealing head 41; Figure 5 for Figure 3 A schematic diagram of the structure of the middle fixed seat 42.

[0032] This embodiment provides a stiffness valve 100, which includes a coil component 3, a spindle 82, a sealing component 81, a valve seat 5, and a cooperating core iron 83 and a head component 4. The head component 4 includes a head 41 and a fixing seat 42. Figure 1In the stiffness valve 100, a magnetically conductive housing 2, a valve seat 5, and an end cap component 1 are also included. The end cap component 1 includes a cylindrical end cap body 12 and a terminal block 11 covering the top of the end cap body 12. The end cap body 12 and the terminal block 11 can be welded together. The end cap body 12 is fitted onto the outside of the magnetically conductive housing 2 and the terminal block 11. The end cap component 1, the magnetically conductive housing 2, and the valve seat 5 form a cavity, in which the aforementioned coil component 3, spindle 82, sealing component 81, core iron 83, and end cap component 4 are all disposed. The end of the magnetically conductive housing 2 near the valve seat 5 is fixed to the outer edge of the valve seat 5 by a riveting compression port. A third sealing ring 7 can be provided between the outer wall of the valve seat 5 and the magnetically conductive housing 2 for sealing.

[0033] The mandrel 82 is connected to the core iron 83 and the sealing component 81 at both ends, respectively. The connection can be a separate connection or an integral connection, so that the mandrel 82, core iron 83, and sealing component 81 can move synchronously along the axial direction. The axial direction is the axial direction of the stiffness valve 100, as shown in the figure. Figure 1 The coil component 3 includes a coil winding 31 and a coil bobbin 32. The coil winding 31 is wound around the coil bobbin 32. The coil component 3 has an axially penetrating inner hole, which is specifically the inner hole of the coil bobbin 32. The end cap 41 includes an axially penetrating through-hole 41a, through which the mandrel 82 passes.

[0034] In this embodiment, the end cap component 4 of the stiffness valve 100 further includes a fixed seat 42. The end cap 41 and the fixed seat 42 are fixedly connected, or the end cap 41 and the fixed seat 42 are axially limited, meaning that the end cap 41 and the fixed seat 42 cannot move relative to each other in the axial direction. At this time, at least a portion of the core iron 83 and at least a portion of the end cap 41 are axially distributed in the inner hole of the coil component 3, and a spring 84 is provided between the core iron 83 and the end cap 41. Specifically, the stiffness valve 100 may also include a sleeve 9, with the core iron 83 located inside the sleeve 9, a portion of the end cap 41 located in the sleeve 9, the coil component 3 sleeved on the outside of the sleeve 9, a portion of the sleeve 9 located in the inner hole of the coil component 3, and a portion located in the end cap component 1, with the core iron 83 located within the space enclosed by the sleeve 9 and the end cap 41.

[0035] Figure 1 The working principle of the stiffness valve 100 is as follows:

[0036] When the coil component 3 is not energized, the core iron 83 moves away from the sealing head 41 under the elastic force of the spring 84. The core iron 83 drives the sealing component 81 away from the valve port 5a through the spindle 82, so that the valve port 5a is in the open state.

[0037] When coil component 3 is energized, a magnetic field is generated around it. The magnetically conductive outer shell 2, the fixing base 42, the sealing head 41, the core iron 83, and the magnetically conductive plate (not shown in the figure) inside coil component 3 form a complete magnetically conductive circuit. An attractive force is generated between the core iron 83 and the sealing head 41 in the magnetic field. Under the action of the attractive force, the core iron 83 overcomes the elastic force of the spring 84 and moves towards the sealing head 41. The core iron 83 drives the spindle 82, and then drives the sealing component 81 to move towards the valve port 5a, thus closing the valve port 5a. After coil component 3 is de-energized, the core iron 83 and the sealing head 41 are demagnetized, the attractive force disappears, and the core iron 83 moves away from the sealing head 41 under the action of the spring 84. The spindle 82 drives the sealing component 81 away from the valve port 5a, thus opening the valve port 5a.

[0038] The fixing seat 42 of the stiffness valve 100 is located between the coil component 3 and the valve seat 5, specifically between the coil frame 32 and the valve seat 5. Exemplarily, the coil frame 32 includes a cylindrical component, and the two ends of the cylindrical component have a first annular flange 321 and a second annular flange extending radially, respectively, which are perpendicular to the axial direction to form an annular groove for accommodating the coil winding 31. The annular flange near the valve seat 5 is the first annular flange 321, and the other annular flange is the second annular flange. The fixing seat 42 is located between the first annular flange 321 of the coil frame 32 and the end face of the valve seat 5. Figure 1 The vertical direction is defined as the axial direction. The end of the valve seat 5 closest to the coil component 3 is the upper end, and the end of the coil component 3 closest to the valve seat 5 is the lower end. Therefore, the fixing seat 42 is located between the upper end face of the valve seat 5 and the lower end face of the coil component 3 (i.e., the lower surface of the first annular flange 321 of the coil frame 32). With this configuration, the fixing seat 42 is clamped between the valve seat 5 and the coil component 3 and cannot move axially. The fixing seat 42 is fixed to or axially limited by the sealing head 41, thus preventing axial movement of the sealing head 41 and ensuring the stability of the sealing head component 4's position. Additionally, as... Figure 2 As shown, the inner wall of the magnetic housing 2 is provided with a ninth step surface 21, which abuts against the first annular flange 321. It can also be welded and fixed at the same time. The inner wall of the magnetic housing 2 and the outer wall of the fixing seat 42 are in contact. The two can abut against each other or have a clearance fit.

[0039] It is understood that in this embodiment, the sealing head 41 and the fixing seat 42 are two independently configured components. The fixing seat 42 is located axially between the valve seat 5 and the coil component 3, used to restrict the axial movement of the sealing head 41 for use as a stationary iron core. At least a portion of the sealing head 41 is disposed within the inner hole of the coil component 3 to engage with the core iron 83. This configuration, as... Figure 1As shown, the main body of the sealing head 41 is located in the inner hole of the coil component 3, and its outer diameter is relatively small. The fixing seat 42 is located between the sealing head 41 and the valve seat 5, and its outer diameter is relatively large. Thus, the two components, the sealing head 41 and the fixing seat 42, can be processed from two materials with different outer diameters. Compared with the sealing head structure in the prior art, this can reduce the generation of waste and save material costs.

[0040] Additionally, please continue to refer to Figure 1 The mandrel 82 passes through the end cap 41. The portion of the mandrel 82 passing through one axial side of the end cap 41 connects to the core iron 83, and can be fixed to the core iron 83 by welding or interference fit. The portion of the mandrel 82 passing through the other axial side of the end cap 41 connects to the sealing component 81. At this time, at least a portion of the through hole 41a of the end cap 41 provides guidance for the mandrel 82. Since the axial height of the end cap 41 is relatively high, and the fixing seat 42 is clamped between the coil component 3 and the valve seat 5 for limiting movement, the axial height of the fixing seat 42 can be set to be relatively low. Correspondingly, the end cap 41 can be machined, and the fixing seat 42 can be stamped. That is, by adopting appropriate processing techniques for these two components, the processing speed can be improved, and the processing cost can be reduced.

[0041] In detail, such as Figure 4 As shown, the sealing head 41 in this embodiment includes a sealing head body 415 and an extension 414. Figure 4 The diagram uses dashed lines to indicate that the main body 415 and the extension 414 are actually an integral structure. The main body 415 is entirely located within the inner hole of the coil component 3. The extension 414 extends axially from the end of the main body 415 near the valve seat 5. The extension 414 can be an annular wall structure or multiple columnar structures distributed circumferentially; for example... Figure 3 As shown, the fixing seat 42 has an axially extending inner hole 42a, into which the extension 414 is inserted. In this case, the extension 414 and the wall of the inner hole 42a can be interference-fitted to fix the end cap 41 and the fixing seat 42. The end cap 41 and the fixing seat 42 can also be welded together; for example, the extension 414 can be welded to the fixing seat 42, or the extension 414 can be interference-fitted to the fixing seat 42 while also being welded together, to more firmly fix the end cap 41 and the fixing seat 42. The axially extending extension 414 makes the connection between the end cap 41 and the fixing seat 42 more reliable. It can be understood that the extension 414 can also be omitted, and the lower end face of the end cap 41 can be directly welded to the fixing seat 42.

[0042] Please continue to refer to this. Figure 3The head end 41 has an annular first step near the valve seat 5. The first step has a stepped sidewall and a third step surface 413. The stepped sidewall is an extension 414, and the third step surface 413 is the end face of the head body 415 near the valve seat 5, specifically the lower end face of the head body 415. The third step surface 413 abuts against the upper end face of the fixing seat 42. By setting the step to form the extension 414, the processing is relatively simple, and the third step surface 413 overlaps the end face of the valve seat 5, playing a certain limiting role.

[0043] like Figure 6 As shown, Figure 6 for Figure 2 Enlarged view of part C in the middle.

[0044] Combination Figure 2 , 5 It is understood that the inner wall of the fixing seat 42a has an annular second step portion, which is located at the lower end of the inner hole 42. The step surface of the second step portion is a fourth step surface 421, and the fourth step surface 422 faces the sealing component 6. The extension 414 is flush with the fourth step surface 421, specifically, the lower end surface 4141 of the extension 414 is flush with the fourth step surface 421. When welding the extension 414 and the fixing seat 42, a weld will be formed at the joint between the extension 414 and the fixing seat 42. After setting the fourth step surface 421, the weld is located at the position where the fourth step surface 421 and the extension 414 meet, and is separated from the sealing component 81 by the height of one step portion. In this way, it can be ensured that the weld caused by welding does not protrude from the lower end surface of the fixing seat 42, preventing the sealing component 6 from being subjected to the force from the weld and not affecting the performance of the sealing component 6.

[0045] Combination Figure 2 , 3 4. Understanding: The through hole 41a of the sealing head 41 includes a first hole section 41a1, a second hole section 41a2, and a third hole section 41a3 connected sequentially along the axial direction. The stiffness valve 100 includes a spring 84, a portion of which is located in the first hole section 41a1, and another portion of which can be disposed within the hole section of the core iron 83. The core shaft 82 and the second hole section 41a2 are in sliding engagement. A portion of the sealing component 81 is located within the third hole section 41a3, and is in close clearance engagement with the hole wall of the third hole section 41a3. The diameter of the second hole section 41a2 is smaller than the diameters of the third hole section 41a3 and the first hole section 41a1, and the diameter of the first hole section 41a1 is also smaller than the diameter of the third hole section 41a3. This arrangement allows the first hole section 41a1 to provide space to accommodate a portion of the spring 84, and the third hole section 41a3 to provide space to accommodate a portion of the sealing component 81, while also providing some guidance for the axial movement of the sealing component 81. The through hole 41a is set as a three-section design, which not only satisfies the need for the mandrel 82 to pass through, but also serves as a spring support and guide.

[0046] In this embodiment, the sealing head 41 can be made of a soft magnetic material, such as soft magnetic stainless steel, and the fixing seat 42 can be made of a magnetically conductive material. Soft magnetic materials have the characteristic of rapid demagnetization. When the sealing head 41 and the core iron 83 are combined, the sealing head 41, made of a soft magnetic material that is easy to demagnetize, can quickly demagnetize, resulting in a rapid disappearance of the attraction between the sealing head 41 and the core iron 83 when the valve is opened, thus responding quickly to the opening and closing of the valve port 5a. During the closing process of the valve port 5a, the fixing seat 42 does not need to provide attraction or rapid demagnetization; therefore, it only needs to be made of a material with good magnetic conductivity. The sealing head 41 and the fixing seat 42 can be made of different materials to reduce material costs.

[0047] like Figure 7 As shown, Figure 7 for Figure 2 Enlarged view of part B in the middle.

[0048] The stiffness valve 100 in this embodiment also includes a sealing component 6. The sealing component 6 includes a guide sleeve 63. The inner sidewall of the guide sleeve 63 is provided with a groove 63a. The outer sidewall of the guide sleeve 63 is provided with an annular protrusion 631. The two annular surfaces of the annular protrusion 631 along the axial direction are a fifth step surface 6311 and a sixth step surface 6312, respectively. The fifth step surface 6311 faces upward toward the fixed seat 42, and the sixth step surface 6312 faces downward. The sealing assembly 6 also includes a first sealing ring 61 and a second sealing ring 62. A portion of the first sealing ring 61 is accommodated in the groove 63a. The inner side of the first sealing ring 61 abuts against the outer wall of the sealing component 81, forming a dynamic seal. The second sealing ring 62 is pressed between the fixed seat 42 and the fifth step surface 6311 of the guide sleeve 63, forming a static seal. The lower end face of the fixed seat 42 contacts the upper end face of the guide sleeve 63. The inner wall of the valve seat 5 has a sixth step surface 51, and the sixth step surface 6312 of the guide sleeve 63 abuts against the seventh step surface 51 of the valve seat 5. Providing the seventh step surface 51 on the valve seat 5 for mounting the guide sleeve 63 can be achieved by increasing the total height of the valve seat 5 and reducing the total height of the fixed seat 42. The valve seat 5 can be made of non-metallic materials, which reduces the use of metallic materials, lowers costs, and reduces the weight of the rigid valve 100.

[0049] The sealing assembly 6 includes a guide sleeve 63, a first sealing ring 61, and a second sealing ring 62. It has a simple structure, is easy to assemble, and has low processing costs. The first sealing ring 61 is always in a sealed state with the outer wall of the sealing component 81, and its sealing performance is independent of external pressure, ensuring reliable sealing.

[0050] In this embodiment, the first sealing ring 61 is provided with a sealing lip 611, which is an annular structure extending outward from the outer circumference of the first sealing ring 61. The sealing lip 611 abuts against the outer side wall of the sealing component 81 and the bottom wall of the groove 63a. The sealing lip 611 makes the seal with the sealing component 81 more reliable.

[0051] The outer wall of the aforementioned annular protrusion 631 contacts the inner wall of the valve seat 5, either abutting or clearance fitting, thus making the connection with the valve seat 5 more reliable and more stably clamping the second sealing ring 62.

[0052] like Figure 2 As shown, the outer side of the valve seat 5 is provided with a tenth step surface 52 facing the end cap component 4. The aforementioned third sealing ring 7 can be pressed axially between the tenth step surface 52 and the fixed seat 42. Alternatively, the third sealing ring 7 can be pressed radially between the magnetic housing 2 and the outer wall of the valve seat 5, or it can be pressed simultaneously in both the axial and radial directions.

[0053] The outer side of the valve seat 5 may be provided with an eleventh step surface 53, which is arranged opposite to the tenth step surface 52. The end of the magnetic housing 2 near the valve seat 5 is riveted to the eleventh step surface 53. Such a connection is more reliable and simple to install.

[0054] like Figure 2 As shown, a buffer pad 85 is installed at the upper end of the sealing component 81. When the valve is opened, the buffer pad 85 contacts the bottom surface 416 of the hole of the third hole section 41a3 of the sealing head 41 to form a buffer and reduce the impact force of opening the valve.

[0055] Combination Figure 1 , 4 It is understood that the outer wall of the head 41 is provided with an upward-facing first step surface 411 and a second step surface 422. The lower end of the sleeve 9 can abut against the first step surface 411. The coil frame 32 is provided with an eighth step surface 322, which can abut against the second step surface 412. The assembly and positioning are relatively reliable. The step surfaces can also be welded and fixed at the same time.

[0056] Figure 3 , 5 In the middle, the upper end of the inner wall of the fixing seat 42a is also provided with a slope 422, that is, the upper end of the inner hole 42a of the fixing seat is flared, so that the extension 414 can be inserted into the inner hole 42 of the fixing seat more smoothly.

[0057] like Figure 8 As shown, Figure 8 This is a schematic diagram of the air spring 200 in an embodiment of this application.

[0058] The air spring 200 includes an inner cavity wall 2002 and an outer shell 2001. The outer shell 2001 is made of a compressible material. The outer shell 2001 and the inner cavity wall 2002 together form a main cavity 200a. The inner cavity wall 2002 together forms a portion of the wall of a secondary cavity 200b. The inner cavity wall 2002 is made of a rigid material. The stiffness valve 100 in the above embodiment is used to connect or disconnect the main cavity 200a and the secondary cavity 200b, such as... Figure 6 As shown, the stiffness valve 100 is installed on the inner cavity wall 2002, forming the wall of the secondary cavity 200b. The opening and closing of the valve port 5a of the stiffness valve 100 controls the opening and closing of the main cavity 200a and the secondary cavity 200b. The valve port 5a of the stiffness valve 100 is connected to the main cavity 200a of the air spring 200, and the lateral interface of the stiffness valve 100 is connected to the secondary cavity 200b of the air spring 200. When the stiffness valve 100 is not working, the valve port 5a is open, that is, the main cavity 200a and the secondary cavity 200b of the air spring 200 are connected. At this time, the volume of air V1 that can be compressed in the air spring 200 is at its maximum: V1 = V_main + V_secondary, where V_main is the volume of the main cavity 200a and V_secondary is the volume of the secondary cavity 200b. At this point, the stiffness K value of the stiffness valve 100 is at its minimum, meaning the air spring 200 is at its softest. When the stiffness valve 100 is working, the coil component 3 is energized, the valve port 5a is closed, and the main chamber 200a and the secondary chamber 200b are not connected. At this point, the volume of air V2 available for compression in the air spring 200 is at its minimum: V2 = V_main, and the stiffness K value of the stiffness valve 100 is at its maximum, meaning the air spring 200 is at its stiffest.

[0059] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A stiffness valve, characterized in that, It includes a coil component, a mandrel, a sealing component, a valve seat, and a mating core iron and a head component. The two ends of the mandrel are respectively connected to the core iron and the sealing component. The valve seat is provided with a valve port, and the sealing component is used to open and close the valve port. The end cap component includes an end cap head and a fixing seat. The end cap head includes a through hole extending axially. The mandrel passes through the through hole. The end cap head and the fixing seat are fixedly connected or axially limited. At least a portion of the core iron and at least a portion of the end cap head are distributed axially in the inner hole of the coil component. The fixing seat is located axially between the coil component and the valve seat.

2. The stiffness valve according to claim 1, characterized in that, The sealing head includes a sealing head body and an extension. The sealing head body is located in the inner hole of the coil component, and the extension extends axially from one end of the sealing head body near the valve seat. The fixing seat has an axially penetrating fixing seat inner hole, and the extension is inserted into the fixing seat inner hole. The extension and the inner hole of the fixing seat are interference-fitted, and / or the sealing head and the fixing seat are welded together.

3. The stiffness valve according to claim 2, characterized in that, The end of the sealing head near the valve seat is provided with an annular first step portion, the step sidewall of the first step portion is the extension portion, the step surface of the first step portion is one end face of the sealing head body portion, and the step surface of the first step portion abuts against the end face of the fixing seat.

4. The stiffness valve according to claim 2, characterized in that, A sealing assembly is provided between the sealing component and the valve seat, and the inner wall of the fixed seat is provided with an annular second step portion, the step surface of the second step portion facing the sealing assembly.

5. The stiffness valve according to claim 4, characterized in that, The extension is flush with the step surface of the second step.

6. The stiffness valve according to claim 1, characterized in that, The through hole of the sealing head includes a first hole segment, a second hole segment, and a third hole segment connected sequentially along the axial direction; the stiffness valve includes a spring, a portion of which is located in the first hole segment; the mandrel and the second hole segment are in sliding fit; a portion of the sealing component is located in the third hole segment; and the diameter of the second hole segment is smaller than the diameters of the third hole segment and the first hole segment.

7. The stiffness valve according to any one of claims 1-6, characterized in that, The sealing head is made of soft magnetic material, and the fixing base is made of magnetically conductive material.

8. The stiffness valve according to any one of claims 1-6, characterized in that, The coil component includes a coil winding and a coil frame, and the mounting base is located between the coil frame and the valve seat.

9. The stiffness valve according to claim 8, characterized in that, The coil frame has an annular flange at one end near the fixed base, and the fixed base is located axially between the annular flange and the valve seat; the stiffness valve also includes a magnetically conductive shell, the magnetically conductive shell is connected to the valve seat at one end near the valve seat, and the inner sidewall of the magnetically conductive shell is provided with a stepped surface, the stepped surface of the magnetically conductive shell abuts against the annular flange, and the inner sidewall of the magnetically conductive shell abuts against or is clearance-fitted with the outer sidewall of the fixed base.

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