Valve sleeve and solenoid valve

Abstract

The utility model belongs to solenoid valve technical field, specifically provides a kind of valve sleeve and solenoid valve of containing solenoid valve spool.The utility model aims at solving the problem of low qualification rate of the valve sleeve of existing solenoid valve by welding forming mode.For this purpose, the valve sleeve of the utility model includes first magnetic conduction portion, magnetic isolation portion and second magnetic conduction portion sequentially distributed along the axial direction, the first magnetic conduction portion, the magnetic isolation portion and the second magnetic conduction portion are formed into integrated structure, and the first magnetic conduction portion, the magnetic isolation portion and the second magnetic conduction portion jointly define the containing cavity for accommodating the valve core, and the open mouth of the containing cavity is formed in the end of the first magnetic conduction portion away from the second magnetic conduction portion.The utility model improves the qualification rate of valve sleeve.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, and specifically provides a valve sleeve for accommodating an electromagnetic valve core and an electromagnetic valve. Background Technology

[0002] Air springs are widely used in the suspension systems of various vehicles. They achieve variable stiffness characteristics by adjusting the air chamber pressure, thus balancing driving comfort and handling stability. The solenoid valve is the core component for adjusting the stiffness of the air spring. By moving its internal valve core, it controls the opening and closing of the air passage between the air inlet and outlet, thereby changing the effective air chamber volume of the air spring and achieving stiffness adjustment.

[0003] Existing solenoid valves generally include a valve body, a valve core, a coil assembly, and a return spring. The valve body has an inlet and an outlet, and the valve core is movably mounted within the valve body. The coil assembly is mounted on the outside of the valve body to drive the valve core, thereby controlling the flow of air between the inlet and outlet. The return spring is located between the valve body and the valve core, and drives the valve core to return to its original position when the coil assembly is de-energized.

[0004] The valve body typically comprises a valve nozzle, a front yoke, a magnetic shielding tube, and a stationary iron core, connected in sequence. The valve nozzle provides the air inlet and outlet. The front yoke guides the magnetic lines of force generated when the coil assembly is energized to the valve core, creating a magnetic circuit between the coil assembly, front yoke, valve core, and stationary iron core. This causes the stationary iron core to attract the valve core, thus driving its movement. The magnetic shielding tube isolates the magnetic lines of force between the front yoke and the stationary iron core, preventing the formation of a magnetic circuit between the coil assembly, front yoke, and stationary iron core, which would affect the magnetic attraction of the stationary iron core to the valve core.

[0005] In existing technology, the front yoke, magnetic shielding tube, and stationary iron core are three independent components, which are fixed together by welding. However, during the welding process, due to the small thickness of the magnetic shielding tube, the front yoke, magnetic shielding tube, and stationary iron core are prone to developing and / or thermal cracks, resulting in a low pass rate. Utility Model Content

[0006] One objective of this invention is to solve the problem of low pass rate in existing solenoid valves whose valve sleeves are formed by welding.

[0007] To achieve the above objectives, the present invention provides a valve sleeve for accommodating a solenoid valve core in a first aspect, comprising a first magnetically conductive portion, a magnetically shielding portion, and a second magnetically conductive portion arranged sequentially along the axial direction. The first magnetically conductive portion, the magnetically shielding portion, and the second magnetically conductive portion are formed as an integral structure, and the first magnetically conductive portion, the magnetically shielding portion, and the second magnetically conductive portion together define an accommodating cavity for accommodating the valve core. The opening of the accommodating cavity is formed at the end of the first magnetically conductive portion away from the second magnetically conductive portion.

[0008] Optionally, the connection surface between the first magnetic conductive part and the magnetic shielding part includes a first radial annular surface, a first axial annular surface and an inclined slope that are connected in sequence. The first radial annular surface is perpendicular to the axial direction of the valve sleeve, the first axial annular surface is parallel to the axial direction of the valve sleeve, and the angle between the inclined slope and the valve sleeve is selected from any value between 30° and 60°.

[0009] Optionally, the first radial annular surface, the first axial annular surface, and the inclined slope are distributed sequentially from the outside to the inside along the radial direction of the valve sleeve, so that the magnetic shielding part wraps around a portion of the first magnetic conductive part; and / or, the inclined slope is located at one end of the first axial annular surface near the second magnetic conductive part; and / or, the angle between the inclined slope and the valve sleeve is selected from any value between 40° and 50°.

[0010] Optionally, the connection surface between the second magnetic conductive part and the magnetic shielding part includes a second radial annular surface and a second axial annular surface that are connected in sequence. The second radial annular surface is perpendicular to the axial direction of the valve sleeve, and the second axial annular surface is parallel to the axial direction of the valve sleeve.

[0011] Optionally, the second radial annular surface is located radially outside the second axial annular surface of the valve sleeve, so that the magnetically shielding part wraps around a portion of the second magnetically conductive part.

[0012] Optionally, the cavity includes a magnetically conductive section and a magnetically shielding section, the magnetically conductive section being surrounded by the first magnetically conductive part, and the magnetically shielding section being surrounded by the magnetically shielding part.

[0013] Optionally, the ratio of the axial length of the magnetically conductive section to the axial length of the magnetically shielding section is selected from any value between 1.5 and 3.

[0014] Optionally, the first magnetic conductive part, the magnetic shielding part, and the second magnetic conductive part each correspond to a container material, and the three containers are connected into a container structure by friction welding, vacuum diffusion welding, laser welding, or argon arc welding, so that the container structure can be machined to produce the first magnetic conductive part, the magnetic shielding part, and the second magnetic conductive part.

[0015] In a second aspect, this utility model provides an electromagnetic valve, characterized in that... The valve body includes a valve seat and a valve sleeve as described in any one of the first aspects, wherein the valve seat is provided with an air inlet and an air outlet; The valve core is at least partially located within the valve sleeve and is used to control the opening and closing of the air passage between the air inlet and the air outlet.

[0016] Optionally, the valve core includes a moving iron core and a valve plug mounted on the moving iron core. The valve plug is used to control the opening and closing of the air passage between the air inlet and the air outlet. The valve plug has at least one damping portion that protrudes outward along its radial direction. The damping portion slides in contact with the valve seat, and the damping portion is deformed by the valve seat in the radial direction to generate a damping force that hinders the valve core from moving along its axial direction.

[0017] Optionally, there are multiple damping sections, which are distributed circumferentially along the valve plug to allow gas to flow axially from between two adjacent damping sections along the valve plug.

[0018] Based on the foregoing description, those skilled in the art will understand that in the aforementioned technical solution of this utility model, by forming the first magnetically conductive part, the magnetically shielding part, and the second magnetically conductive part into an integral structure, welding is avoided, thereby preventing deformation and thermal cracking of the valve sleeve, thus improving the valve sleeve's pass rate. Furthermore, because the first magnetically conductive part, the magnetically shielding part, and the second magnetically conductive part are formed into an integral structure, the problem of loosening and cracking of the valve sleeve due to weld vibration during use is also avoided.

[0019] Furthermore, by making the connecting surface between the first magnetically conductive part and the magnetically shielding part include a first radial annular surface, a first axial annular surface and an inclined slope that are connected in sequence, the joint area between the first magnetically conductive part and the magnetically shielding part is increased, thereby improving the structural strength between the first magnetically conductive part and the magnetically shielding part.

[0020] Furthermore, by making the connecting surface between the second magnetically conductive part and the magnetically shielding part include a second radial annular surface and a second axial annular surface that are connected in sequence, the joint area between the second magnetically conductive part and the magnetically shielding part is increased, thereby improving the structural strength between the second magnetically conductive part and the magnetically shielding part.

[0021] Other beneficial effects of this utility model will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the improvement purpose, features and advantages of this utility model. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this utility model, some embodiments of this utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the same reference numerals may indicate the same or similar components or parts in different drawings; the drawings of this utility model are not necessarily drawn to scale. In the drawings: Figure 1 This is an exploded view (first isometric view) of the solenoid valve in some embodiments of this utility model. Figure 2 This is an exploded view (second isometric view) of the solenoid valve in some embodiments of this utility model. Figure 3 This is a perspective view of the solenoid valve in some embodiments of this utility model; Figure 4 yes Figure 3 A cross-sectional view of the solenoid valve along the AA direction (closed state); Figure 5 yes Figure 3 A cross-sectional view of the solenoid valve along the AA direction (open state with the coil assembly hidden). Figure 6 yes Figure 3 A cross-sectional view of the middle valve sleeve along the AA direction; Figure 7 yes Figure 6 Enlarged view of the F1 section; Figure 8 yes Figure 6 Enlarged view of section F2.

[0023] Explanation of reference numerals in the attached figures: 001. Solenoid valve; 100. Valve body; 101. Air inlet; 102. Air outlet; 110. Valve sleeve; 1101. Receptacle cavity; 11011. Magnetic conductive section; 11012. Magnetic shielding section; 1102. Spring positioning hole; 111. First magnetic conductive part; 112. Magnetic shielding part; 113. Second magnetic conductive part; 1141. First radial annular surface; 1142. First axial annular surface; 1143. Inclined slope; 1151. Second radial annular surface; 1152. Second axial annular surface; 120. Valve seat; 200. Valve core; 210. Moving iron core; 220. Valve plug; 221. Damping part; 300. Coil assembly; 310. Electromagnetic coil; 320. Coil support; 330. Coil housing; 400. Return spring; o, axial direction; z, circumferential direction; r, radial direction. Detailed Implementation

[0024] Those skilled in the art should understand that the embodiments described below are merely some embodiments of the present invention, and not all embodiments of the present invention. These embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of the present invention.

[0025] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the corresponding device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. For example, unless otherwise specified, the terms "installation," "connection," "joining," and "fixing" can specifically refer to any feasible connection form such as bolt connection, screw connection, welding, insertion, riveting, fusion welding, or snap-fit.

[0027] Furthermore, it should be noted that in the description of this utility model, mm represents millimeter, cm represents centimeter, and m represents meter.

[0028] The valve sleeve of the solenoid valve core of the present invention will be described below in conjunction with a solenoid valve.

[0029] like Figures 1 to 5 As shown, in some embodiments of this utility model, the solenoid valve 001 includes a valve body 100, a valve core 200, a coil assembly 300, and a return spring 400. The valve core 200 is movably disposed within the valve body 100, the coil assembly 300 is mounted on the outside of the valve body 100 and is used to drive the valve core 200 to move in one direction, and the return spring 400 is disposed within the valve body 100 and located axially between the valve body 100 and the valve core 200 to drive the valve core 200 to move in the other direction.

[0030] like Figures 1 to 5 As shown, the valve body 100 includes a valve sleeve 110 and a valve seat 120. The valve sleeve 110 and the valve seat 120 together define a receiving cavity (not marked in the figure) for accommodating the valve core 200. The valve sleeve 110 and the valve seat 120 are fixed together by any feasible method such as welding or interference fit. The valve seat 120 is provided with an air inlet 101 and an air outlet 102 communicating with the receiving cavity.

[0031] like Figure 4 and Figure 5 As shown, the valve core 200 is movably installed in the receiving cavity to control the opening and closing of the air passage between the air inlet 101 and the air outlet 102.

[0032] like Figure 6 As shown, in some embodiments of this utility model, the valve sleeve 110 includes a first magnetically conductive portion 111, a magnetically shielding portion 112, and a second magnetically conductive portion 113 sequentially distributed along the axial direction o. The first magnetically conductive portion 111, the magnetically shielding portion 112, and the second magnetically conductive portion 113 are formed as an integral structure, and the first magnetically conductive portion 111, the magnetically shielding portion 112, and the second magnetically conductive portion 113 together define a receiving cavity 1101 for accommodating the valve core 200, and the opening of the receiving cavity 1101 is formed at the end of the first magnetically conductive portion 111 away from the second magnetically conductive portion 113.

[0033] Those skilled in the art will understand that by molding the first magnetically conductive part 111, the magnetically shielding part 112, and the second magnetically conductive part 113 into a single structure, welding is avoided, thereby preventing deformation and hot cracking of the valve sleeve 110, and thus improving the pass rate of the valve sleeve 110. Furthermore, because the first magnetically conductive part 111, the magnetically shielding part 112, and the second magnetically conductive part 113 are molded into a single structure, the problem of loosening and cracking of the valve sleeve 110 due to weld vibration during use is also avoided.

[0034] like Figure 7 As shown, the connecting surface between the first magnetically conductive part 111 and the magnetically shielding part 112 includes a first radial annular surface 1141, a first axial annular surface 1142 and an inclined slope 1143 connected in sequence, so as to increase the joint area between the first magnetically conductive part 111 and the magnetically shielding part 112, thereby improving the structural strength between the first magnetically conductive part 111 and the magnetically shielding part 112.

[0035] from Figure 6 and Figure 7 As can be seen, the first radial annular surface 1141 is perpendicular to the axial direction o of the valve sleeve 110, the first axial annular surface 1142 is parallel to the axial direction o of the valve sleeve 110, and the angle γ between the inclined slope 1143 and the valve sleeve 110 is selected from any value between 30° and 60°.

[0036] Furthermore, the angle γ between the inclined slope 1143 and the valve sleeve 110 is selected from any value between 40° and 50°. For example, the angle γ can be any feasible value such as 40°, 42°, 45°, 48°, 50°, etc.

[0037] like Figure 6 and Figure 7As shown, the inclined slope 1143 is located at one end of the first axial annular surface 1142 near the second magnetic conductive part 113. Furthermore, the first radial annular surface 1141, the first axial annular surface 1142, and the inclined slope 1143 are distributed sequentially from the outside to the inside along the radial direction r of the valve sleeve 110, so that the magnetic shielding part 112 encloses a portion of the first magnetic conductive part 111.

[0038] like Figure 6 and Figure 8 As shown, the connecting surface between the second magnetic conductive part 113 and the magnetic shielding part 112 includes a second radial annular surface 1151 and a second axial annular surface 1152 connected in sequence, so as to increase the joint area between the second magnetic conductive part 113 and the magnetic shielding part 112, thereby improving the structural strength between the second magnetic conductive part 113 and the magnetic shielding part 112.

[0039] from Figure 6 and Figure 8 As can be seen, the second radial annular surface 1151 is perpendicular to the axial direction o of the valve sleeve 110, and the second axial annular surface 1152 is parallel to the axial direction o of the valve sleeve 110. Furthermore, the second radial annular surface 1151 is located outside the second axial annular surface 1152 in the radial direction r of the valve sleeve 110, so that the magnetic shielding part 112 wraps around a part of the second magnetic conductive part 113.

[0040] like Figure 6 As shown, the accommodating cavity 1101 includes a magnetically conductive section 11011 and a magnetically shielding section 11012. The magnetically conductive section 11011 is surrounded by a first magnetically conductive portion 111, and the magnetically shielding section 11012 is surrounded by a magnetically shielding portion 112. Furthermore, the ratio of the axial length L1 of the magnetically conductive section 11011 to the axial length L2 of the magnetically shielding section 11012 is selected from any value between 1.5 and 3 to ensure the magnetic shielding performance of the magnetically shielding portion 112.

[0041] The ratio of L1 to L2 can be any feasible value such as 1.5, 1.8, 2, 2.2, 2.5, 2.8, or 3.

[0042] Furthermore, in this invention, the first magnetically conductive part 111 and the second magnetically conductive part 113 can be made of any feasible soft magnetic material, such as iron-chromium soft magnetic alloy, iron-molybdenum soft magnetic alloy, iron-cobalt-vanadium soft magnetic alloy, manganese-zinc ferrite, lithium-zinc ferrite, iron-based nanocrystalline composite material, etc. The magnetically shielding part 112 can include at least one of pure copper, copper alloy, pure aluminum, aluminum alloy, nickel-based alloy, and austenitic stainless steel.

[0043] The materials of the first magnetic conductive part 111 and the second magnetic conductive part 113 can be the same or different.

[0044] In this invention, the soft magnetic material and the magnetic shielding material can be fixedly connected into a whole by forging, welding, fusion or other means, and then the valve sleeve 110 of this invention can be processed by machining.

[0045] Example 1: First, a round rod made of soft magnetic material is provided. Then, an annular groove is machined on the outer peripheral wall of the rod. Next, magnetic shielding material is added to the annular groove by welding. Finally, a valve sleeve 110 with a first magnetic conductive part 111, a magnetic shielding part 112, and a second magnetic conductive part 113 is machined.

[0046] Example 2: The first magnetically conductive part 111, the magnetically shielding part 112, and the second magnetically conductive part 113 each correspond to a substrate. These three substrates are joined into a substrate structure via friction welding, vacuum diffusion welding, laser welding, or argon arc welding. The substrate structure is then machined to form the first magnetically conductive part 111, the magnetically shielding part 112, and the second magnetically conductive part 113. Specifically, two first round rods made of soft magnetic material and one second round rod made of magnetically shielding material are provided. The second round rod is arranged axially between the two first round rods, and the three round rods are welded together. A valve sleeve 110 with the first magnetically conductive part 111, the magnetically shielding part 112, and the second magnetically conductive part 113 is then machined.

[0047] Example 3: Two first blanks made of soft magnetic material and one second blank made of magnetic shielding material are provided. The two first blanks sandwich the second blank in the middle and are heated simultaneously to a malleable temperature. Then, the three blanks are forged into one blank. Finally, a valve sleeve 110 with a first magnetic conductive part 111, a magnetic shielding part 112, and a second magnetic conductive part 113 is machined.

[0048] like Figures 4 to 6 As shown, the second magnetic part 113 on the valve sleeve 110 also defines a spring positioning hole 1102 to fix the reset spring 400 and prevent the reset spring 400 from being misaligned.

[0049] like Figures 1 to 5 As shown, the valve core 200 includes a moving iron core 210 and a valve plug 220 mounted on the moving iron core 210, so that the valve core 200 blocks the air passage between the air inlet 101 and the air outlet 102 through the valve plug 220.

[0050] The valve plug 220 has at least one damping portion 221 that protrudes outward along its radial direction r. The damping portion 221 slides in contact with the valve seat 120, and the damping portion 221 is deformed by the valve seat 120 in the radial direction r to generate a damping force that hinders the movement of the valve core 200 along its axial direction o, thereby reducing the impact of the valve core 200 on the valve body 100.

[0051] from Figure 1 and Figure 2 As can be seen, there are multiple damping sections 221, which are distributed at intervals along the circumferential z-axis of the valve plug 220, so that gas flows from between two adjacent damping sections 221 along the axial o-axis of the valve plug 220.

[0052] Furthermore, all the damping parts 221 are evenly distributed along the circumferential z-axis of the valve plug 220 to ensure the concentricity of the valve core 200 and the valve body 100.

[0053] Furthermore, the number of damping parts 221 is selected from any value from 2 to 8, such as 2, 3, 5, 8, etc.

[0054] In addition, those skilled in the art may, as needed, provide only one damping part 221 and open at least one air guide channel through its axial direction o on the damping part 221 so that the gas flows between the two ends of the axial direction o of the damping part 221.

[0055] like Figure 4 As shown, the coil assembly 300 includes an electromagnetic coil 310, a coil support 320, and a coil housing 330. The electromagnetic coil 310 is mounted on the coil support 320, and the coil housing 330 is sleeved on the outside of the electromagnetic coil 310 and the coil support 320. The electromagnetic coil 310 is fitted onto the valve sleeve 110 via the coil support 320.

[0056] like Figure 4 As shown, one end of the return spring 400 is fitted into the spring positioning hole 1102 of the valve sleeve 110, and the other end of the return spring 400 is fitted into the blind hole (not marked in the figure) of the moving iron core 210.

[0057] When the electromagnetic coil 310 is energized, a magnetic circuit is formed between the electromagnetic coil 310, the first magnetic conductive part 111, the moving iron core 210, and the second magnetic conductive part 112. This causes the second magnetic conductive part 112 to attract the valve core 200, thereby driving the valve core 200 to move and opening the air passage between the air inlet 101 and the air outlet 102 (e.g., Figure 5 (As shown).

[0058] When the electromagnetic coil 310 is de-energized, the return spring 400 drives the valve core 200 to reset, thereby blocking the air passage between the air inlet 101 and the air outlet 102 (e.g., Figure 4 (As shown).

[0059] The following reference Figure 4 and Figure 5 The working principle of the solenoid valve 001 in some embodiments of this utility model will be briefly explained below.

[0060] like Figure 4As shown, when the solenoid valve 001 is de-energized, the solenoid coil 310 does not generate a magnetic field. The valve core 200 abuts against the valve seat 120 under the action of the return spring 400, thereby blocking the air passage between the air inlet 101 and the air outlet 102.

[0061] When solenoid valve 001 is energized, solenoid coil 310 generates a magnetic field, causing the second magnetic conductive part 112 and moving iron core 210 to attract each other. This force overcomes the elastic force of return spring 400, driving valve core 200 from... Figure 4 Move the position to Figure 5 The position shown. During this process, the damping part 221 slides in contact with the valve body 100 to slow down the movement of the valve core 200 and reduce the impact force of the valve core 200 on the valve body 100.

[0062] like Figure 5 As shown, when the solenoid valve 001 is energized, the solenoid coil 310 generates a magnetic field, which causes the second magnetic part 112 and the moving iron core 210 to attract each other and move closer together, and causes the valve core 200 to move away from the valve seat 120, so as to open the air passage between the air inlet 101 and the air outlet 102.

[0063] When solenoid valve 001 is de-energized, valve core 200, under the action of return spring 400, is... Figure 5 Move the position to Figure 4 The position shown. During this process, the damping part 221 slides in contact with the valve body 100 to slow down the movement of the valve core 200 and reduce the impact force of the valve core 200 on the valve body 100.

[0064] Based on the foregoing description, those skilled in the art will understand that the solenoid valve 001 of this utility model not only improves the yield of the valve sleeve 110, but also reduces the impact of the valve core 200 on the valve body 100 and reduces the working noise of the solenoid valve 001.

[0065] Furthermore, the solenoid valve 001 described in any of the preceding embodiments of this utility model can be used to adjust the stiffness of the air spring and can be installed in a car.

[0066] The technical solution of this utility model has been described in conjunction with several embodiments above. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is not limited to these specific embodiments. Without departing from the technical principles of this utility model, those skilled in the art can disassemble and combine the technical solutions in the above embodiments, and can also make equivalent changes or substitutions to the relevant technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of this utility model will fall within the protection scope of this utility model.

[0067] Finally, it should be noted that in this invention, the term "connection" refers to fluid communication, allowing fluids (e.g., air, liquid) to flow between two interconnected entities. Furthermore, this "connection" can be either a leak-free flow of fluid between two interconnected entities, or a flow with slight leakage of fluid between two interconnected entities.

Claims

1. A valve sleeve for housing a solenoid valve core, characterized in that, It includes a first magnetically conductive part, a magnetically insulating part, and a second magnetically conductive part, which are distributed sequentially along the axial direction. The first magnetically conductive part, the magnetically shielding part, and the second magnetically conductive part are formed into a single structure, and The first magnetically conductive part, the magnetically shielding part, and the second magnetically conductive part together define a receiving cavity for accommodating the valve core, and the opening of the receiving cavity is formed at the end of the first magnetically conductive part away from the second magnetically conductive part.

2. The valve sleeve according to claim 1, characterized in that, The connection surface between the first magnetically conductive part and the magnetically insulating part includes a first radial annular surface, a first axial annular surface, and an inclined slope that are connected in sequence. The first radial annular surface is perpendicular to the axial direction of the valve sleeve. The first axial annular surface is parallel to the axial direction of the valve sleeve. The angle between the inclined slope and the valve sleeve is selected from any value between 30° and 60°.

3. The valve sleeve according to claim 2, characterized in that, The first radial annular surface, the first axial annular surface, and the inclined slope are distributed sequentially from the outside to the inside along the radial direction of the valve sleeve, so that the magnetically shielding part encloses a portion of the first magnetically conductive part; and / or, The inclined slope is located at one end of the first axial annular surface near the second magnetically conductive part; and / or The angle between the inclined slope and the valve sleeve is selected from any value between 40° and 50°.

4. The valve sleeve according to claim 1, characterized in that, The connection surface between the second magnetically conductive part and the magnetically shielding part includes a second radial annular surface and a second axial annular surface that are connected in sequence. The second radial annular surface is perpendicular to the axial direction of the valve sleeve. The second axial annular surface is parallel to the axial direction of the valve sleeve.

5. The valve sleeve according to claim 4, characterized in that, The second radial annular surface is located radially outside the second axial annular surface of the valve sleeve, so that the magnetically shielding part wraps around a portion of the second magnetically conductive part.

6. The valve sleeve according to any one of claims 1 to 5, characterized in that, The cavity includes a magnetically conductive section and a magnetically shielding section. The magnetically conductive section is surrounded by the first magnetically conductive part. The magnetic shielding section is surrounded by the magnetic shielding part.

7. The valve sleeve according to claim 6, characterized in that, The ratio of the axial length of the magnetically conductive section to the axial length of the magnetically insulating section is selected from any value between 1.5 and 3.

8. The valve sleeve according to any one of claims 1 to 5, characterized in that, The first magnetic conductive part, the magnetic shielding part, and the second magnetic conductive part each correspond to a container material. The three containers are connected into a container structure by friction welding, vacuum diffusion welding, laser welding, or argon arc welding, so that the container structure can be machined to form the first magnetic conductive part, the magnetic shielding part, and the second magnetic conductive part.

9. A solenoid valve, characterized in that, The valve body includes a valve seat and a valve sleeve according to any one of claims 1 to 8, wherein the valve seat is provided with an air inlet and an air outlet; The valve core is at least partially located within the valve sleeve and is used to control the opening and closing of the air passage between the air inlet and the air outlet.

10. The solenoid valve according to claim 9, characterized in that, The valve core includes a moving iron core and a valve plug mounted on the moving iron core. The valve plug is used to control the opening and closing of the air passage between the air inlet and the air outlet. The valve plug has at least one damping portion that protrudes radially outward, the damping portion slidingly contacting the valve seat, and the damping portion being deformed by the valve seat in the radial direction to generate a damping force that resists the movement of the valve core in its axial direction.

Images