Method for processing valve sleeve accommodating electromagnetic valve spool and electromagnetic valve

Abstract

This invention belongs to the field of solenoid valve manufacturing technology, specifically providing a method for processing a valve sleeve for housing a solenoid valve core and a solenoid valve. The processing method includes a first intermediate part forming step: processing a blank made of soft magnetic material into a first intermediate part having a first intermediate shape. A second intermediate part forming step: applying a magnetic shielding material to the annular groove of the first intermediate part, such that the applied magnetic shielding material covers the deepest recessed groove bottom wall radially inward, to form a second intermediate part having a second intermediate shape; a valve sleeve forming step: processing a cylindrical receiving cavity with a forming hole depth and forming hole diameter within the second intermediate part, and using the remaining magnetic shielding material on the valve sleeve to separate the remaining soft magnetic material into a first soft magnetic portion and a second soft magnetic portion. This invention avoids the situation where the valve sleeve deforms and thermally cracks due to insufficient thickness in local areas, thereby improving the yield rate of the valve sleeve.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic valve manufacturing technology, and specifically provides a method for processing a valve sleeve for housing 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. Summary of the Invention

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

[0007] In a first aspect, the present invention provides a method for processing a valve sleeve for housing a solenoid valve core, comprising: The first intermediate component forming step involves processing a blank made of soft magnetic material into a first intermediate component having a first intermediate shape, wherein... The first intermediate shape includes a first cylindrical segment having a first axial cylindrical length and a first cylindrical diameter, a second cylindrical segment having a second axial cylindrical length and a second cylindrical diameter, and a third cylindrical segment having a third axial cylindrical length and a third cylindrical diameter, which are connected sequentially along the axial direction. The first cylindrical section has an annular groove that is concave in the radial direction. The distances from the two ends of the annular groove to the first end of the first cylindrical section away from the annular groove and the second end of the third cylindrical section away from the annular groove are respectively a first spacing and a second spacing. The cylindrical shape where the bottom wall of the annular groove is most concave in the radial direction has a groove diameter, which is smaller than the diameter of the first cylinder, the diameter of the second cylinder, and the diameter of the third cylinder. The second intermediate component forming step is as follows: applying a magnetic shielding material to the annular groove of the first intermediate component, such that the applied magnetic shielding material covers the bottom wall of the groove that is recessed deepest in the radial direction, to form a second intermediate component having a second intermediate shape. Valve sleeve forming step: From the second end of the third cylindrical section of the second intermediate part along the axial direction toward the first cylindrical section, a cylindrical receiving cavity with forming hole depth and forming hole diameter is machined in the second intermediate part, wherein the forming hole depth is less than the forming hole diameter is less than the diameter of the first cylinder and greater than the diameter of the groove, thereby forming the valve sleeve, and such that the remaining magnetic shielding material on the valve sleeve divides the remaining soft magnetic material into a first soft magnetic part and a second soft magnetic part.

[0008] Optionally, the first middleware formation step includes: Hot forging step: Using a hot forging process, the soft magnetic blank is processed into the first intermediate shape under a first temperature and a first pressure; wherein the first temperature is selected from any value between 600°C and 1000°C, and the first pressure is selected from any value between 100MPa and 150MPa. Vacuum annealing step: Under a second temperature, the soft magnetic blank of the first intermediate shape is vacuum annealed for a first preset time to eliminate forging stress and obtain the first intermediate part; wherein, the second temperature is selected from any value between 500°C and 900°C, and the first preset time is selected from any value between 0.5h and 3h.

[0009] Optionally, the magnetic shielding material includes one or more of pure copper, copper alloy, pure aluminum, aluminum alloy, nickel-based alloy, and austenitic stainless steel; The second intermediate component formation step includes: Welding step: The magnetic shielding material is welded to the annular groove of the first intermediate part using a welding process, and the annular groove is filled to form the second intermediate part having the second intermediate shape; Welding protection steps: During the welding process, inert gas is blown into the annular groove to prevent the magnetic shielding material from oxidizing.

[0010] Optionally, the magnetic shielding material includes one or more of pure copper, copper alloy, pure aluminum, aluminum alloy, nickel-based alloy, and austenitic stainless steel; The second intermediate component formation step includes: The magnetic shielding material is applied to the annular groove of the first intermediate part using a metal spraying process, and the annular groove is filled to form a second intermediate part having the second intermediate shape. The spraying temperature in the metal spraying process is selected from any value between 1600℃ and 2000℃. The spraying pressure in the metal spraying process is selected from any value between 0.5 MPa and 1 MPa. The spraying distance of the metal spraying process is selected from any value between 100mm and 200mm, and The coating density of the metal spraying process is greater than or equal to 99%.

[0011] Optionally, the magnetic shielding material includes one or more of pure copper, copper alloy, pure aluminum, aluminum alloy, nickel-based alloy, and austenitic stainless steel; The second intermediate component formation step includes: The magnetic shielding material is welded to the annular groove of the first intermediate part using a vacuum brazing process, and the annular groove is filled to form a second intermediate part having the second intermediate shape. The heating rate of the vacuum brazing process is selected from any value between 3°C / min and 8°C / min. The holding time for the vacuum brazing process is selected from any value between 30 min and 90 min, and The cooling rate of the vacuum brazing process is selected from any value between 1°C / min and 5°C / min.

[0012] Optionally, the first intermediate component has a positioning hole with one end open, the opening being formed at the second end, and the diameter of the positioning hole is denoted as the initial diameter, and the depth of the positioning hole is denoted as the initial depth. The valve sleeve forming step includes: Hole enlargement step: The peripheral wall and bottom wall of the positioning hole are processed to form an intermediate hole with an intermediate hole diameter and the forming hole depth, such that the bottom wall of the intermediate hole is located on the side of the annular groove away from the diameter of the third cylinder, wherein the intermediate hole diameter is larger than the initial hole diameter and the forming hole depth is larger than the initial hole depth. Grinding step: Grind the peripheral wall of the intermediate hole to form a cylindrical receiving cavity with a shaped hole depth and a shaped hole diameter.

[0013] Optionally, the valve sleeve forming step further includes: The first cylindrical segment processing step: A fourth cylindrical segment with a fourth axial cylindrical length and a fourth cylindrical diameter is formed on the starting segment adjacent to the first end of the first cylindrical segment, wherein the fourth axial cylindrical length is less than the first axial cylindrical length, and the fourth cylindrical diameter is less than the first cylindrical diameter but greater than the forming hole depth; and / or, The third cylindrical segment processing steps include: processing the outer peripheral wall of the third cylindrical segment to reduce the diameter of the third cylindrical segment from the diameter of the third cylinder to the diameter of the fifth cylinder; and / or, Processing steps for the section containing the magnetic shielding material: Process the outer peripheral wall of the structure formed by the magnetic shielding material to form a transition surface section; wherein the transition surface section includes a first cylindrical transition section, a second cylindrical transition section and a conical transition section distributed in sequence, the outer diameter of the first cylindrical transition section is equal to the diameter of the first cylinder, and the diameter of the second cylindrical transition section is equal to the diameter of the second cylinder.

[0014] Optionally, after the valve sleeve forming step, the processing method further includes: Stress-relief annealing step: The valve sleeve is held at a third temperature for a second preset time to eliminate the processing stress of the valve sleeve, wherein... The third temperature is selected from any value between 100°C and 500°C. The second preset duration is selected from any value between 0.5h and 1.5h.

[0015] Optionally, the annular groove is formed on the outer peripheral wall of the first cylindrical section adjacent to the second cylindrical section.

[0016] Optionally, the annular groove includes a first annular groove and a second annular groove, the second annular groove being disposed between the first annular groove and the second cylindrical section, and the depth of the second annular groove being greater than the depth of the first annular groove.

[0017] Optionally, the diameter of the bottom wall of the first annular groove is greater than or equal to the forming aperture, so as to reduce the amount of magnetic shielding material used.

[0018] Optionally, the outer peripheral wall of the magnetic shielding material on the second intermediate piece protrudes radially from the outer peripheral wall of the first cylindrical section.

[0019] Optionally, in the axial direction of the second intermediate member, a portion of the magnetic shielding material on the second intermediate member is located within the annular groove, and another portion of the magnetic shielding material on the second intermediate member is located on the outer peripheral wall of the second cylindrical section.

[0020] Optionally, the length of the first axial cylinder is greater than the length of the second axial cylinder, and the length of the second axial cylinder is greater than the length of the third axial cylinder; and the diameter of the first cylinder is smaller than the diameter of the second cylinder, and the diameter of the second cylinder is smaller than the diameter of the third cylinder.

[0021] In a second aspect, the present invention provides a solenoid valve, comprising: The valve body includes a valve seat and a valve sleeve obtained by the processing method described in any one of the first aspects, wherein the valve seat is provided with an air inlet and an air outlet; and 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.

[0022] Based on the foregoing description, those skilled in the art will understand that in the aforementioned technical solution of this invention, a second intermediate part is formed by first processing the blank into a first intermediate part with an annular groove, and then applying a magnetic shielding material within the annular groove. A cylindrical receiving cavity is machined into the second intermediate part, thereby allowing the remaining magnetic shielding material on the valve sleeve to separate the remaining soft magnetic material into a first soft magnetic portion and a second soft magnetic portion, thus forming the valve sleeve. This avoids the situation in the prior art where the valve sleeve experiences deformation and thermal cracking due to localized thinness, thereby improving the valve sleeve's yield rate.

[0023] Furthermore, the magnetic shielding material is fused into the annular groove through welding, metal spraying, or vacuum brazing processes, and then fused together with the first intermediate component to form the second intermediate component. A receiving cavity is then machined inside the second intermediate component to form a valve sleeve. This process not only achieves high machining precision but also avoids heat treatment of the second intermediate component, ensuring a high yield rate for the valve sleeve.

[0024] Other beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the improved objectives, features and advantages of the present invention. Attached Figure Description

[0025] To more clearly illustrate the technical solution of the present invention, some embodiments of the present invention 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 parts or components in different drawings; the drawings of the present invention are not necessarily drawn to scale. In the drawings: Figure 1 This is a flowchart of the processing method in some embodiments of the present invention; Figure 2 This is a schematic diagram of the structure of a blank provided by the present invention; Figure 3 This is a schematic diagram of the structure of a first middleware provided by the present invention; Figure 4 yes Figure 3 A cross-sectional view of the first intermediate component along the AA direction; Figure 5 This is a schematic diagram of the structure of a second intermediate component provided by the present invention; Figure 6 yes Figure 5 A cross-sectional view of the second intermediate component along the BB direction; Figure 7 This is a schematic diagram of the structure of a valve sleeve provided by the present invention; Figure 8 yes Figure 7 A cross-sectional view of the valve sleeve along the CC direction; Figure 9 This is a flowchart of the steps for forming the first intermediate component in some embodiments of the present invention; Figure 10 This is a flowchart of a step in forming the second intermediate in some embodiments of the present invention; Figure 11 This is a flowchart of another step in the formation of the second intermediate in some embodiments of the present invention; Figure 12 This is a flowchart illustrating the specific steps involved in valve sleeve forming in some embodiments of the present invention; Figure 13 This is an exploded view of the structure of a solenoid valve provided by the present invention; Figure 14 yes Figure 13 An exploded view of the structure of a solenoid valve from another perspective; Figure 15 yes Figure 13 and Figure 14 A schematic diagram showing the assembly effect of the solenoid valve. Figure 16 yes Figure 15 A cross-sectional view of the solenoid valve along the DD direction.

[0026] Explanation of reference numerals in the attached figures: 001. Solenoid valve; 010. Valve body; 020. Valve core; 030. Coil assembly; 040. Return spring; 100. Raw material; 200, First intermediate component; 201, Annular groove; 2011, First annular groove; 2012, Second annular groove; 202, Positioning hole; 210, First cylindrical section; 211, First end; 220, Second cylindrical section; 230, Third cylindrical section; 231, Second end; 300. Magnetic shielding material; 310. Transition surface section; 311. First cylindrical surface transition section; 312. Second cylindrical surface transition section; 313. Conical surface transition section; 400. Second Middleware; 500, Valve sleeve; 501, Receiving cavity; 502, Intermediate hole; 503, Spring fixing hole; 510, Fourth cylindrical section; 520, First soft magnetic part; 530, Second soft magnetic part; 600, Valve seat; 601, Air inlet; 602, Air outlet; 710. Moving iron core; 720. Valve plug; 810. Electromagnetic coil; 820. Coil support; 830. Coil housing; ZL1, first axial cylinder length; ZD1, first cylinder diameter; ZL2, length of the second axial cylinder; ZD2, diameter of the second cylinder; ZL3, length of the third axial cylinder; ZD3, diameter of the third cylinder; ZL4, length of the fourth axial cylinder; ZD4, diameter of the fourth cylinder; ZD5, diameter of the fifth cylinder; J1, first spacing; J2, second spacing; CD, groove diameter; DL, initial hole depth; DD, initial hole diameter; JD, intermediate hole diameter; RL, forming hole depth; RD, forming hole diameter. Detailed Implementation

[0027] Those skilled in the art should understand that the embodiments described below are merely a part of the embodiments of the present invention, and not all of the embodiments of the present invention. These partial 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.

[0028] It should be noted that in the description of this invention, 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, it should be noted that, in the description of this invention, 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention 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 bolted connections, screw connections, welding, insertion, riveting, fusion welding, and snap-fitting.

[0030] Furthermore, it should be noted that in the description of this invention, mm represents millimeter, cm represents centimeter, and m represents meter.

[0031] like Figure 1 As shown, in some embodiments of the present invention, the method for processing the valve sleeve containing the solenoid valve core includes: First intermediate part forming step S100: The blank 100 made of soft magnetic material (such as...) is formed by forming a blank 100 (e.g., a blank 100 made of soft magnetic material) into a blank 100. Figure 2 (As shown) is processed into a first intermediate part 200 having a first intermediate shape (e.g. Figure 3 and Figure 4 (As shown).

[0032] like Figure 3 and Figure 4 As shown, the first intermediate shape includes a first cylindrical section 210 having a first axial cylindrical length ZL1 and a first cylindrical diameter ZD1, a second cylindrical section 220 having a second axial cylindrical length ZL2 and a second cylindrical diameter ZD2, and a third cylindrical section 230 having a third axial cylindrical length ZL3 and a third cylindrical diameter ZD3, which are connected sequentially along the axial direction.

[0033] Figure 3The two dotted lines shown are the dividing lines between adjacent sections of the first cylindrical section 210, the second cylindrical section 220, and the third cylindrical section 230, for ease of understanding.

[0034] The diameters of the first cylinder ZD1, the second cylinder ZD2, and the third cylinder ZD3 can be equal or unequal.

[0035] Continue reading Figure 3 and Figure 4 The first cylindrical section 210 has an annular groove 201 that is radially recessed inward. The distances from the two axial ends of the annular groove 201 to the first end 211 of the first cylindrical section 210 away from the annular groove 201 and the second end 231 of the third cylindrical section 230 away from the annular groove 201 are respectively the first spacing J1 and the second spacing J2. The cylindrical shape where the bottom wall of the annular groove 201 is located in the radially recessed deepest part has a groove diameter CD. The groove diameter CD is smaller than the diameters ZD1, ZD2, and ZD3 of the first cylinder, so as to reduce the cutting amount during subsequent machining of the first cylindrical section 210, the second cylindrical section 220, and the third cylindrical section 230 (this will be explained in detail later).

[0036] Second intermediate component forming step S200: Apply magnetic shielding material 300 to the annular groove 201 of the first intermediate component 200, such that the applied magnetic shielding material 300 covers the deepest recessed bottom wall of the groove along the radial direction, to form a second intermediate component 400 having a second intermediate shape (e.g., Figure 5 and Figure 6 (As shown).

[0037] Valve sleeve forming step S300: From the second end 231 of the third cylindrical section 230 of the second intermediate part 400, along the axial direction towards the first cylindrical section 210, a cylindrical receiving cavity 501 with a forming hole depth RL and a forming hole diameter RD is machined within the second intermediate part 400 (e.g., Figure 7 and Figure 8 (As shown).

[0038] like Figure 7 and Figure 8 As shown, the depth diameter RLD of the forming hole is smaller than the diameter ZD1 of the first cylinder and larger than the diameter CD of the groove, thereby forming a valve sleeve 500, and causing the remaining magnetic shielding material 300 on the valve sleeve 500 to separate the remaining soft magnetic material into a first soft magnetic part 520 and a second soft magnetic part 530.

[0039] Those skilled in the art will understand that a second intermediate part 400 is formed by first machining the blank 100 into a first intermediate part 200 with an annular groove 201, and then applying a magnetic shielding material 300 within the annular groove 201. A cylindrical receiving cavity 501 is machined into the second intermediate part 400, thereby allowing the remaining magnetic shielding material 300 on the valve sleeve 500 to separate the remaining soft magnetic material into a first soft magnetic portion 520 and a second soft magnetic portion 530, thus forming the valve sleeve 500. This avoids the situation in the prior art where the valve body 010 has a small thickness in some areas, leading to deformation and thermal cracking of the valve sleeve 500, thereby improving the yield rate of the valve sleeve 500.

[0040] like Figure 9 As shown, the first intermediate component formation step S100 may further include: Hot forging step S110: Using hot forging process, under the conditions of first temperature and first pressure, the soft magnetic blank 100 is processed into a first intermediate shape.

[0041] The first temperature is selected from any value between 600℃ and 1000℃. For example, 600℃, 650℃, 700℃, 750℃, 800℃, 900℃, 1000℃, etc.

[0042] The first pressure is selected from any value between 100MPa and 150MPa. For example, 100MPa, 110MPa, 120MPa, 125MPa, 130MPa, 140MPa, 150MPa, etc.

[0043] Furthermore, the first temperature is selected from any value between 800°C and 900°C, and the first pressure is selected from any value between 110 MPa and 130 MPa. For example, the first temperature is 850°C, and the first pressure is selected from 120 MPa.

[0044] Vacuum annealing step S120: Under the condition of the second temperature, the soft magnetic blank 100 of the first intermediate shape is vacuum annealed for a first preset time to eliminate forging stress and obtain the first intermediate part 200.

[0045] The second temperature is selected from any value between 500℃ and 900℃. For example, 500℃, 600℃, 650℃, 700℃, 750℃, 800℃, 900℃, etc.

[0046] The first preset duration is selected from any value between 0.5h and 3h. For example, 0.5h, 0.8h, 1h, 1.5h, 2h, 2.3h, 2.8h, 3h, etc.

[0047] Furthermore, the second temperature can be selected from any value between 700°C and 900°C. The first preset duration can be selected from any value between 1.5h and 2.5h. For example, the second temperature is 800°C, and the first preset duration is 2h.

[0048] In addition, those skilled in the art can, as needed, use machining to process the blank 100 made of soft magnetic material into a first intermediate part 200 having a first intermediate shape.

[0049] In this embodiment, the magnetic shielding material 300 includes one or more of pure copper, copper alloy, pure aluminum, aluminum alloy, nickel-based alloy, and austenitic stainless steel.

[0050] like Figure 10 As shown, the second intermediate component forming step S200 includes: Step S211: The magnetic shielding material 300 is deposited into the annular groove 201 of the first intermediate part 200 using a welding process, and the annular groove 201 is filled to form a second intermediate part 400 having a second intermediate shape.

[0051] For example, T2 copper welding wire (diameter 1.2mm, resistivity ≤1.7×10⁻) is used. 8 The welding current (Ω・m) is controlled at 180-200A, the voltage is controlled at 20-22V, the welding speed is 80mm / min, the thickness of each layer is at least 0.5mm, and a total of 3 layers are welded to fill the annular groove 201.

[0052] Welding protection step S212: During the welding process, inert gas is blown into the annular groove 201 to prevent the magnetic shielding material 300 from oxidizing.

[0053] The inert gas may include at least one of argon and helium.

[0054] For example, argon gas is blown into the annular groove 201 at a rate of 15 L / min.

[0055] like Figure 11 As shown, those skilled in the art can also replace steps S211 and S212 entirely with step S220 or step S230 as needed.

[0056] Step S220 includes: applying magnetic shielding material 300 to the annular groove 201 of the first intermediate part 200 using a metal spraying process, and filling the annular groove 201 to form a second intermediate part 400 having a second intermediate shape.

[0057] The spraying temperature of the metal spraying process is selected from any value between 1600℃ and 2000℃, such as 1600℃, 1800℃, 1900℃, 1950℃, 2000℃, etc.

[0058] The spraying pressure in the metal spraying process is selected from any value between 0.5MPa and 1MPa, such as 0.5MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1MPa, etc.

[0059] The spraying distance for the metal spraying process is selected from any value between 100mm and 200mm, such as 100mm, 120mm, 128mm, 150mm, 175mm, 180mm, 200mm, etc.

[0060] Among them, the coating density of the metal spraying process is greater than or equal to 99%, such as 99%, 99.1%, 99.5%, 99.6%, 99.8%, etc.

[0061] Furthermore, the spraying temperature of the metal spraying process can be selected from any value between 1700℃ and 1900℃, the spraying pressure of the metal spraying process can be selected from any value between 0.7MPa and 0.9MPa, the spraying distance of the metal spraying process can be selected from any value between 130mm and 170mm, and the coating density of the metal spraying process is greater than or equal to 99.3%.

[0062] For example, the spraying temperature of the metal spraying process is 1800℃, the spraying pressure is 0.8MPa, the spraying distance is 150mm, and the coating density of the metal spraying process is greater than or equal to 99.5%.

[0063] Step S230 includes: using a vacuum brazing process to weld the magnetic shielding material 300 into the annular groove 201 of the first intermediate part 200 and fill the annular groove 201 to form a second intermediate part 400 having a second intermediate shape.

[0064] The heating rate of the vacuum brazing process is selected from any value between 3℃ / min and 8℃ / min, such as 3℃ / min, 4℃ / min, 5℃ / min, 5.6℃ / min, 7.5℃ / min, 8℃ / min, etc.

[0065] The holding time for the vacuum brazing process is selected from any value between 30 min and 90 min, such as 30 min, 45 min, 50 min, 55 min, 59 min, 67 min, 75 min, 80 min, 89 min, 90 min, etc.

[0066] The cooling rate for the vacuum brazing process is selected from any value between 1℃ / min and 5℃ / min. For example, 1℃ / min, 1.5℃ / min, 2℃ / min, 2.5℃ / min, 3℃ / min, 4℃ / min, 5℃ / min, etc.

[0067] Furthermore, the heating rate of the vacuum brazing process can be selected from any value between 4℃ / min and 6℃ / min, the holding time of the vacuum brazing process can be selected from any value between 50min and 70min, and the cooling rate of the vacuum brazing process can be selected from any value between 2℃ / min and 4℃ / min.

[0068] For example, the heating rate of the vacuum brazing process is 5℃ / min, the holding time of the vacuum brazing process is 60min, and the cooling rate of the vacuum brazing process is 3℃ / min.

[0069] from Figure 2 and Figure 3 As can be seen, the first intermediate part 200 has a positioning hole 202 with one end open, which facilitates positioning of the first intermediate part 200 during subsequent processing. The opening of the positioning hole 202 is formed at the second end 231, and the diameter of the positioning hole 202 is denoted as the initial diameter DD, and the depth of the positioning hole 202 is denoted as the initial depth DL.

[0070] like Figure 12 As shown, the valve sleeve 500 forming step S300 further includes: Hole enlarging step S310: The peripheral wall and bottom wall of the positioning hole 202 are machined to form an intermediate hole 502 with an intermediate hole diameter JD and a forming hole depth RL (e.g., Figure 8 As shown), so that the bottom wall of the intermediate hole 502 is located on the side of the annular groove 201 away from the diameter ZD3 of the third cylinder.

[0071] Among them, the intermediate aperture JD is greater than the initial aperture DD, and the formed hole depth RL is greater than the initial hole depth DL.

[0072] In this step, the machining method may include at least one of drilling, boring, turning, and cutting.

[0073] Grinding step S320: Grind the peripheral wall of the intermediate hole 502 to form a cylindrical receiving cavity 501 with a forming hole depth RL and a forming hole diameter RD, thereby ensuring the peripheral wall accuracy of the cylindrical receiving cavity 501.

[0074] like Figure 12 As shown, the valve sleeve forming step S300 may further include at least one of steps S330, S340 and S350.

[0075] Step S330 is the machining step for the first cylindrical segment 210: A fourth cylindrical segment 510 with a fourth axial cylindrical length ZL4 and a fourth cylindrical diameter ZD4 is formed on the starting segment adjacent to the first end 211 of the first cylindrical segment 210 (e.g., ...). Figure 7 and Figure 8 (As shown).

[0076] Wherein, the length of the fourth axial cylinder ZL4 is less than the length of the first axial cylinder ZL1, and the diameter of the fourth cylinder ZD4 is less than the diameter of the first cylinder ZD1 but greater than the depth of the forming hole RL, in order to adapt to the coil assembly 030 of the solenoid valve 001 (such as... Figure 16 (As shown).

[0077] Step S340 is the machining step for the third cylindrical section 230: The outer peripheral wall of the third cylindrical section 230 is machined to reduce the diameter of the third cylindrical section 230 from the third cylindrical diameter ZD3 to the fifth cylindrical diameter ZD5, thereby adapting the third cylindrical section 230 to the valve nozzle of the solenoid valve 001 (e.g., Figure 16 (As shown).

[0078] Step S350 is the processing step for the section where the magnetic shielding material 300 is located: The outer peripheral wall of the structure formed by the magnetic shielding material 300 is processed to form a transition surface section 310, to adapt to the coil assembly 030 of the solenoid valve 001 (e.g., Figure 16 (As shown).

[0079] The transition surface section 310 includes a first cylindrical transition section 311, a second cylindrical transition section 312, and a conical transition section 313 distributed sequentially. The outer diameter of the first cylindrical transition section 311 is equal to the diameter of the first cylinder ZD1, and the diameter of the second cylindrical transition section 312 is equal to the diameter of the second cylinder ZD2.

[0080] This step is used to adapt the outer surface of the magnetic shielding material 300 to the coil assembly 030 of the solenoid valve 001 (e.g., Figure 16 (As shown).

[0081] Furthermore, although not shown in the figure, the valve sleeve forming step S300 may also include the step of: machining a spring fixing hole 503 on the bottom wall of the receiving cavity 501 to position the reset spring 040 and prevent the reset spring 040 from moving.

[0082] Furthermore, the valve sleeve forming step S300 may also include the step of chamfering the end edges of the starting end (i.e., the first end 211 of the first cylindrical section 210) and the end end (i.e., the second end 231 of the third cylindrical section 230) of the valve sleeve 500 to prevent the sharp corners of the valve sleeve 500 from bumping, damaging or scratching other components and the assembly personnel of the solenoid valve 001.

[0083] Go back and refer to Figure 1After the valve sleeve forming step S300, the processing method in this embodiment may further include a stress-relief annealing step S400: keeping the valve sleeve 500 at a third temperature for a second preset time to eliminate the processing stress of the valve sleeve 500.

[0084] The third temperature is selected from any value between 100℃ and 500℃, such as 100℃, 150℃, 200℃, 300℃, 450℃, 500℃, etc.

[0085] The second preset duration is selected from any value between 0.5h and 1.5h, such as 0.5h, 0.8h, 1h, 1.2h, 1.5h, etc.

[0086] In other embodiments of the present invention, the third temperature may be selected from any value between 250°C and 350°C, and the second preset duration may be selected from any value between 50 min and 80 min.

[0087] In some other embodiments of the present invention, the third temperature may be 30°C and the second preset duration may be 60 minutes.

[0088] It should be noted that, in other embodiments of the present invention, those skilled in the art can adjust, optimize, and configure the schemes and steps in the above embodiments as needed to achieve further technical effects. Other embodiments of the present invention, different from the above embodiments, will be described below with reference to the accompanying drawings. Of course, those skilled in the art can also appropriately modify the execution order, operating conditions, and number of steps in the embodiments described below according to actual needs. The modified embodiments will not deviate from the technical concept and / or technical principles of the present invention and should still fall within the protection scope of the present invention.

[0089] like Figure 4 As shown, the length of the first axial cylinder ZL1 is greater than the length of the second axial cylinder ZL2, and the length of the second axial cylinder ZL2 is greater than the length of the third axial cylinder ZL3. Furthermore, the diameter of the first cylinder ZD1 is smaller than the diameter of the second cylinder ZD2, and the diameter of the second cylinder ZD2 is smaller than the diameter of the third cylinder ZD3, in order to reduce the turning amount of the first intermediate part 200 during subsequent processing and reduce material waste.

[0090] Of course, those skilled in the art can also, as needed, make the diameter of the first cylinder ZD1 larger than the diameter of the second cylinder ZD2, the diameter of the second cylinder ZD2 larger than the diameter of the third cylinder ZD3, or make the diameters of the first cylinder ZD1, the second cylinder ZD2, and the third cylinder ZD3 equal.

[0091] like Figure 3 and Figure 4As shown, in the first intermediate component 200, an annular groove 201 is formed on the outer peripheral wall of the first cylindrical section 210 adjacent to the second cylindrical section 220, so that the magnetic shielding material 300 in the annular groove 201 is simultaneously fused with the first cylindrical section 210 and the second cylindrical section 220, thereby improving the overall structural strength of the valve sleeve 500.

[0092] Continue reading Figure 3 and Figure 4 The annular groove 201 includes a first annular groove 2011 and a second annular groove 2012. The second annular groove 2012 is disposed between the first annular groove 2011 and the second cylindrical section 220, and the depth of the second annular groove 2012 is greater than the depth of the first annular groove 2011. This allows the magnetic shielding material 300 within the second annular groove 2012 to be cut and form part of the peripheral wall of the receiving cavity 501, thereby achieving magnetic shielding between the first soft magnetic portion 520 and the second soft magnetic portion 530.

[0093] like Figure 4 and Figure 8 As shown, the diameter of the bottom wall of the first annular groove 2011 is greater than or equal to the forming aperture RD, so as to reduce the amount of magnetic shielding material 300 used, and at the same time make the circumferential surface of the receiving cavity 501 located inside the bottom wall of the first annular groove 2011.

[0094] like Figure 5 and Figure 6 As shown, the outer peripheral wall of the magnetic shielding material 300 on the second intermediate part 400 protrudes radially from the outer peripheral wall of the first cylindrical section 210 to ensure sufficient magnetic shielding material 300 and facilitate the processing of the outer peripheral wall of the second intermediate part 400.

[0095] like Figure 6 and Figure 8 As shown, along the axial direction of the second intermediate member 400, a portion of the magnetic shielding material 300 on the second intermediate member 400 is located within the annular groove 201, while another portion of the magnetic shielding material 300 on the second intermediate member 400 is located on the outer peripheral wall of the second cylindrical section 220. This enhances the connection strength between the magnetic shielding material 300 and the second soft magnetic portion 530 (e.g., Figure 8 (As shown).

[0096] like Figure 8 As shown, the forming hole depth RL is greater than the sum of the second axial cylindrical length ZL2 and the third axial cylindrical length ZL3, so that the bottom wall of the receiving cavity 501 is located radially inside the magnetic shielding material 300. That is, the forming hole depth RL allows the receiving cavity 501 to extend axially into the first cylindrical section 210 and to be located on the side of the annular groove 201 away from the third axial cylindrical section 230, so that the peripheral wall of the section of the receiving cavity 501 adjacent to its bottom wall is defined by the remaining magnetic shielding material 300.

[0097] like Figures 13 to 16 As shown, the present invention also provides a solenoid valve 001, which includes a valve body 010, a valve core 020, a coil assembly 030, and a return spring 040. The valve core 020 is movably disposed within the valve body 010, the coil assembly 030 is mounted on the outside of the valve body 010 and is used to drive the valve core 020 to move in one direction, and the return spring 040 is disposed within the valve body 010 and axially located between the valve body 010 and the valve core 020 to drive the valve core 020 to move in another direction.

[0098] like Figure 13 , Figure 14 and Figure 16 As shown, the valve body 010 includes a valve seat 600 and a valve sleeve 500 as described in any of the preceding embodiments.

[0099] The valve seat 600 is provided with an air inlet 601 and an air outlet 602. The valve seat 600 and the valve sleeve 500 are fixedly connected together by welding, threaded connection, riveting, or other connection methods.

[0100] like Figure 13 , Figure 14 and Figure 16 As shown, the valve core 020 includes a moving iron core 710 and a valve plug 720 mounted on the moving iron core 710, so that the valve core 020 blocks the air passage between the air inlet 601 and the air outlet 602 through the valve plug 720.

[0101] like Figure 16 As shown, the coil assembly 030 includes an electromagnetic coil 810, a coil support 820, and a coil housing 830. The electromagnetic coil 810 is mounted on the coil support 820, and the coil housing 830 is sleeved on the outside of the electromagnetic coil 810 and the coil support 820. The electromagnetic coil 810 is fitted onto the valve sleeve 500 via the coil support 820.

[0102] like Figure 16 As shown, one end of the return spring 040 is embedded in the spring fixing hole 503 of the valve sleeve 500, and the other end of the return spring 040 is embedded in the blind hole (not marked in the figure) of the moving iron core 710.

[0103] When the electromagnetic coil 810 is energized, a magnetic circuit is formed between the electromagnetic coil 810, the first soft magnetic part 520, the moving iron core 710, and the second soft magnetic part 530, causing the first soft magnetic part 520 to attract the valve core 020, thereby driving the valve core 020 to move and opening the air passage between the air inlet 601 and the air outlet 602.

[0104] When the electromagnetic coil 810 is de-energized, the reset spring 040 drives the valve core 020 to reset, thereby blocking the air passage between the air inlet 601 and the air outlet 602.

[0105] The technical solutions of the present invention have been described in conjunction with several embodiments above. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Without departing from the technical principles of the present invention, 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 related technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of the present invention will fall within the scope of protection of the present invention.

[0106] Finally, it should be noted that the "cylindrical shape" in this invention includes not only simple cylindrical shapes with a single segment having the same diameter, but also complex cylindrical shapes with multiple segments of different diameters connected sequentially along the axial direction and having stepped sections.

Claims

1. A method for processing a valve sleeve for housing a solenoid valve core, characterized in that, include: The first intermediate component forming step involves processing a blank made of soft magnetic material into a first intermediate component having a first intermediate shape, wherein... The first intermediate shape includes a first cylindrical segment having a first axial cylindrical length and a first cylindrical diameter, a second cylindrical segment having a second axial cylindrical length and a second cylindrical diameter, and a third cylindrical segment having a third axial cylindrical length and a third cylindrical diameter, which are connected sequentially along the axial direction. The first cylindrical section has an annular groove that is concave in the radial direction. The distances from the two ends of the annular groove to the first end of the first cylindrical section away from the annular groove and the second end of the third cylindrical section away from the annular groove are respectively a first spacing and a second spacing. The cylindrical shape where the bottom wall of the annular groove is most concave in the radial direction has a groove diameter, which is smaller than the diameter of the first cylinder, the diameter of the second cylinder, and the diameter of the third cylinder. The second intermediate component forming step is as follows: applying a magnetic shielding material to the annular groove of the first intermediate component, such that the applied magnetic shielding material covers the bottom wall of the groove that is recessed deepest in the radial direction, to form a second intermediate component having a second intermediate shape. Valve sleeve forming step: From the second end of the third cylindrical section of the second intermediate piece along the axial direction toward the first cylindrical section, a cylindrical receiving cavity with forming hole depth and forming hole diameter is machined in the second intermediate piece, wherein the forming hole diameter is smaller than the diameter of the first cylinder and larger than the diameter of the groove, thereby forming the valve sleeve, and such that the remaining magnetic shielding material on the valve sleeve divides the remaining soft magnetic material into a first soft magnetic part and a second soft magnetic part.

2. The processing method according to claim 1, characterized in that, The first middleware formation step includes: Hot forging step: Using a hot forging process, the soft magnetic blank is processed into the first intermediate shape under a first temperature and a first pressure; wherein the first temperature is selected from any value between 600°C and 1000°C, and the first pressure is selected from any value between 100MPa and 150MPa. Vacuum annealing step: Under a second temperature, the soft magnetic blank of the first intermediate shape is vacuum annealed for a first preset time to eliminate forging stress and obtain the first intermediate part; wherein, the second temperature is selected from any value between 500°C and 900°C, and the first preset time is selected from any value between 0.5h and 3h.

3. The processing method according to claim 1, characterized in that, The magnetic shielding material includes one or more of pure copper, copper alloy, pure aluminum, aluminum alloy, nickel-based alloy, and austenitic stainless steel; The second intermediate component formation step includes: Welding step: The magnetic shielding material is welded to the annular groove of the first intermediate part using a welding process, and the annular groove is filled to form the second intermediate part having the second intermediate shape; Welding protection steps: During the welding process, inert gas is blown into the annular groove to prevent the magnetic shielding material from oxidizing.

4. The processing method according to claim 1, characterized in that, The magnetic shielding material includes one or more of pure copper, copper alloy, pure aluminum, aluminum alloy, nickel-based alloy, and austenitic stainless steel; The second intermediate component formation step includes: The magnetic shielding material is applied to the annular groove of the first intermediate part using a metal spraying process, and the annular groove is filled to form a second intermediate part having the second intermediate shape. The spraying temperature in the metal spraying process is selected from any value between 1600℃ and 2000℃. The spraying pressure in the metal spraying process is selected from any value between 0.5 MPa and 1 MPa. The spraying distance of the metal spraying process is selected from any value between 100mm and 200mm, and The coating density of the metal spraying process is greater than or equal to 99%.

5. The processing method according to claim 1, characterized in that, The magnetic shielding material includes one or more of pure copper, copper alloy, pure aluminum, aluminum alloy, nickel-based alloy, and austenitic stainless steel; The second intermediate component formation step includes: The magnetic shielding material is welded to the annular groove of the first intermediate part using a vacuum brazing process, and the annular groove is filled to form a second intermediate part having the second intermediate shape. The heating rate of the vacuum brazing process is selected from any value between 3°C / min and 8°C / min. The holding time for the vacuum brazing process is selected from any value between 30 min and 90 min, and The cooling rate of the vacuum brazing process is selected from any value between 1°C / min and 5°C / min.

6. The processing method according to claim 1, characterized in that, The first intermediate component has a positioning hole with an open end, the open end being formed at the second end, and the diameter of the positioning hole is denoted as the initial hole diameter, and the depth of the positioning hole is denoted as the initial hole depth; The valve sleeve forming step includes: Hole enlargement step: The peripheral wall and bottom wall of the positioning hole are processed to form an intermediate hole with an intermediate hole diameter and the forming hole depth, such that the bottom wall of the intermediate hole is located on the side of the annular groove away from the diameter of the third cylinder, wherein the intermediate hole diameter is larger than the initial hole diameter and the forming hole depth is larger than the initial hole depth. Grinding step: Grind the peripheral wall of the intermediate hole to form a cylindrical receiving cavity with a shaped hole depth and a shaped hole diameter.

7. The processing method according to claim 6, characterized in that, The valve sleeve forming step further includes: The first cylindrical segment processing step: A fourth cylindrical segment with a fourth axial cylindrical length and a fourth cylindrical diameter is formed on the starting segment adjacent to the first end of the first cylindrical segment, wherein the fourth axial cylindrical length is less than the first axial cylindrical length, and the fourth cylindrical diameter is less than the first cylindrical diameter but greater than the forming hole depth; and / or, The third cylindrical segment processing steps include: processing the outer peripheral wall of the third cylindrical segment to reduce the diameter of the third cylindrical segment from the diameter of the third cylinder to the diameter of the fifth cylinder; and / or, Processing steps for the section containing the magnetic shielding material: Process the outer peripheral wall of the structure formed by the magnetic shielding material to form a transition surface section; wherein the transition surface section includes a first cylindrical transition section, a second cylindrical transition section and a conical transition section distributed in sequence, the outer diameter of the first cylindrical transition section is equal to the diameter of the first cylinder, and the diameter of the second cylindrical transition section is equal to the diameter of the second cylinder.

8. The processing method according to claim 1, characterized in that, After the valve sleeve forming step, the processing method further includes: Stress-relief annealing step: The valve sleeve is held at a third temperature for a second preset time to eliminate the processing stress of the valve sleeve, wherein... The third temperature is selected from any value between 100°C and 500°C. The second preset duration is selected from any value between 0.5h and 1.5h.

9. The processing method according to any one of claims 1 to 8, characterized in that, The annular groove is formed on the outer peripheral wall of the first cylindrical section adjacent to the second cylindrical section.

10. The processing method according to claim 9, characterized in that, The annular groove includes a first annular groove and a second annular groove. The second annular groove is disposed between the first annular groove and the second cylindrical section, and the depth of the second annular groove is greater than the depth of the first annular groove.

11. The processing method according to claim 10, characterized in that, The diameter of the bottom wall of the first annular groove is greater than or equal to the forming hole diameter, so as to reduce the amount of magnetic shielding material used.

12. The processing method according to claim 9, characterized in that, The outer peripheral wall of the magnetic shielding material on the second intermediate component protrudes radially from the outer peripheral wall of the first cylindrical section.

13. The processing method according to claim 9, characterized in that, In the axial direction of the second intermediate member, a portion of the magnetic shielding material on the second intermediate member is located within the annular groove, and another portion of the magnetic shielding material on the second intermediate member is located on the outer peripheral wall of the second cylindrical section.

14. The processing method according to any one of claims 1 to 8, characterized in that, The length of the first axial cylinder is greater than the length of the second axial cylinder, and the length of the second axial cylinder is greater than the length of the third axial cylinder; and The diameter of the first cylinder is smaller than the diameter of the second cylinder, and the diameter of the second cylinder is smaller than the diameter of the third cylinder.

15. A solenoid valve, characterized in that, include: The valve body includes a valve seat and a valve sleeve obtained by the processing method according to any one of claims 1 to 14, wherein the valve seat is provided with an air inlet and an air outlet; and 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.

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