Manufacturing method of electromagnetic valve

Abstract

The invention provides a manufacturing method of an electromagnetic valve, the electromagnetic valve comprises a core iron assembly, a sleeve and a valve seat, the core iron assembly comprises a movable iron core and a static iron core, the sleeve and the valve seat are made of different materials, and the manufacturing method comprises the following steps that S1, a welding assembly is assembled, an annular containing groove is formed between the sleeve and the valve seat. Welding flux is placed in the containing groove; s2, the welding assembly is placed in a welding furnace to be welded; and S3, assembling the core iron assembly, wherein at least part of the core iron assembly is arranged in the sleeve. According to the electromagnetic valve, the sleeve and the valve seat which are made of different materials are connected through brazing, and the cost can be reduced while reliable connection is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of valve processing, and in particular to a method for manufacturing a solenoid valve. Background Art

[0002] The solenoid valve includes a core iron assembly arranged along the axial direction, and the core iron assembly includes a moving iron core and a static iron core. The static iron core generates magnetism when the driving coil is energized to adsorb the moving iron core. When the driving coil is de-energized, the adsorption force between the static iron core and the moving iron core disappears accordingly. A piston is arranged in the valve body of the solenoid valve, and the piston is used to block or open the valve port opened by the valve body. When the moving iron core is adsorbed and moves toward the static iron core, the piston moves up under the action of the return spring to leave the valve port; when the static iron core no longer adsorbs the moving iron core, the moving iron core moves down under the action of the return spring and overcomes the force of the return spring to press down the piston, so that the piston moves close to the valve port to reduce the opening or open the valve port.

[0003] The solenoid valve also includes a sleeve and a valve seat. The sleeve is arranged outside the moving iron core and the static iron core, and the drive coil is arranged outside the sleeve. The sleeve provides installation space and protection for the moving iron core and the static iron core. The sleeve is generally made of stainless steel. The valve seat is installed on the valve body and is used to connect with the sleeve. It is generally made of stainless steel. The processing cost of this type of solenoid valve is relatively high. Summary of the invention

[0004] The purpose of the present application is to provide a method for manufacturing a solenoid valve, which connects a sleeve and a valve seat made of different materials by brazing, thereby reducing costs while providing a reliable connection.

[0005] The present application provides a method for manufacturing a solenoid valve, the solenoid valve comprising a core iron component, a sleeve and a valve seat, the core iron component comprising a moving iron core and a stationary iron core, the sleeve and the valve seat are made of different materials, and the manufacturing method comprises the following steps:

[0006] Step S1, assembling the welding assembly: fixing the sleeve and the valve seat to form an annular receiving groove between the sleeve and the valve seat; placing solder into the receiving groove;

[0007] Step S2, placing the welding assembly into a welding furnace for welding;

[0008] Step S3, assembling the core iron assembly: placing at least a portion of the core iron assembly in the sleeve.

[0009] The present application forms a receiving groove to accommodate solder to fix the sleeve and the valve seat by brazing, so that the sleeve and the valve seat can be set to different materials. For example, the material of the valve seat is aluminum alloy, and the material of the sleeve is stainless steel. The sleeve and valve seat formed by this combination have excellent corrosion resistance and light specific gravity, which can reduce the cost of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of the solenoid valve in the embodiment of the present application;

[0011] Figure 2 for Figure 1 A cross-sectional view of the solenoid valve along the AA direction;

[0012] Figure 3 for Figure 2 Schematic diagram of the assembly of the middle valve seat and the lower end of the sleeve;

[0013] Figure 4 for Figure 3 Axial section view of the middle valve seat;

[0014] Figure 5 for Figure 3 Axial cross-sectional view of

[0015] Figure 6 for Figure 5 Enlarged view of the B area;

[0016] Figure 7 for Figure 6 A magnified view of the gap between the middle sleeve and the valve seat;

[0017] Figure 8 This is a schematic diagram of another assembly of a valve seat and a lower end of a sleeve in an embodiment of the present application.

[0018] The above-mentioned reference numerals are explained as follows:

[0019] 100. Solenoid valve; 01. Assembly screw; 02. Stationary iron core; 03. Driving coil; 04. Moving iron core; 05. Valve seat; 05a. Socket portion; 051. Step groove; 052. Groove; 053. Inner wall; 053a. Gap wall section; 053b. Interference fit wall section; 054. Step surface; 06. Piston; 07. Return spring; 08. Valve body; 09. Gasket; 010. Second sealing block; 011. Seal; 012. First sealing block; 013. Solder; 014. Return spring; 015-Sleeve; 100a. Gap. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the solenoid valve 100 in the embodiment of the present application; Figure 2 for Figure 1 Cross-sectional view of the solenoid valve along the AA direction.

[0022] The solenoid valve 100 includes a core iron assembly, which includes a static iron core 02 and a moving iron core 04 arranged in the axial direction. Figure 2 From the perspective, the static iron core 02 is located above the moving iron core 04, and the up and down directions are defined with this as a reference. The solenoid valve 100 also includes a valve body 08 and a valve seat 05 installed on the valve body 08. The valve body 08 is provided with a valve port. The valve body 08 is provided with a piston 06, and the piston 06 is connected to the moving iron core 04. In addition, the solenoid valve 100 also includes a drive coil 03 and a sleeve 015. The sleeve 015 covers at least part of the moving iron core 04 and the static iron core 02. The static iron core 02 and the sleeve 015 can be press-fitted and fixed. The drive coil 03 is covered on the outer periphery of the sleeve 015. When the drive coil 03 is energized, the static iron core 02 generates magnetism to attract the moving iron core 04 to move toward the static iron core 02, and then drive the piston 06 to move upward to open the valve port. When the drive coil 03 is de-energized, the magnetism of the static iron core 02 disappears. Under the action of the return spring 014, the moving iron core 04 moves toward the direction away from the static iron core 02 to drive the piston 06 to move downward to reduce the opening or re-seal the valve port. A return spring 07 is also provided in the valve body 08. The return spring 07 extends axially and is provided between the valve body 08 and the piston 06. The return spring 07 provides an upward force for the piston 06. In addition, as Figure 2 As shown, the solenoid valve 100 further includes a combination screw 01, which is used to connect the drive coil 03 and the static iron core 02. The solenoid valve 100 is also provided with a seal 011, which is provided between the valve seat 05 and the piston 06, and is specifically a sealing ring, to achieve sliding sealing between the valve seat 05 and the piston 06.

[0023] like Figure 2 As shown, the upper end of the piston 06 is provided with a first sealing block 012 to establish contact with the moving iron core 04, and the lower end of the piston 06 is also provided with a second sealing block 010, which is used to better seal with the position of the valve port. At the same time, the piston 06 is also provided with a gasket 09 for limiting the second sealing block 010.

[0024] You can continue to refer to Figures 3 to 6 , Figure 3 for Figure 2 Schematic diagram of the assembly of the middle valve seat 05 and the lower end of the sleeve 015; Figure 4 for Figure 3 Axial cross-sectional view of the middle valve seat 05; Figure 5 for Figure 3 Axial cross-sectional view of Figure 6 for Figure 5 Magnified view of area B.

[0025] As described above, the sleeve 015 covers the static iron core 02 and the moving iron core 04, the upper and lower ends of the sleeve 015 are open, and the sleeve 015 and the valve seat 05 are fixed. In this embodiment, the two are set to different materials, for example, the material of the valve seat 05 is aluminum alloy, and the material of the sleeve 015 is stainless steel. The valve seat 05 can also be made of other materials with low cost or light weight. The sleeve 015 and the valve seat 05 formed by this combination have excellent corrosion resistance and light specific gravity, which can reduce the cost of the solenoid valve 100. For the connection of the sleeve 015 and the valve seat 05 of different materials, this embodiment adopts brazing.

[0026] like Figure 4 , 5 As shown, in this embodiment, the valve seat 05 is provided with a socket portion 05a located on the upper side. In fact, the valve seat 05 is arranged to be axially through as a whole, and the sleeve 015 can be inserted into the socket portion 05a along the axial direction, and an annular step groove 051 is provided on the upper end surface of the valve seat 05. The step groove 051 has an outer wall and a bottom wall, and no inner wall. The inside and outside here are relative to the central axis of the valve seat 05. The one close to the central axis is the inside, and the opposite is the outside. In this way, when the sleeve 015 is inserted into the socket portion 05a, the outer wall of the sleeve 015 and the step groove 051 cooperate to form a receiving groove with an upper opening, and the solder 013 can be located in the receiving groove. Figure 6 As shown, the inner wall of the socket portion 05a of the valve seat 05 is also provided with an upward step surface 054, and the lower end surface of the sleeve 015 abuts against the step surface 054 of the valve seat 05 in the axial direction. In addition, a plurality of grooves 052 are provided on the bottom wall of the step groove 051, and the bottom wall of the step groove 051 is also the bottom wall of the receiving groove, and the plurality of grooves 052 provided on the bottom wall are distributed in the circumferential direction, so that the bottom wall of the receiving groove is similar to a sawtooth structure, and each groove 052 can extend in the radial direction and pass through the inner wall of the valve seat 05 to communicate with the socket portion 05a.

[0027] The following describes a method for manufacturing the solenoid valve 100 by brazing provided in this embodiment. The manufacturing method specifically includes the following steps:

[0028] Step S1, assembling welding components: fixing the valve seat 05 and the sleeve 015, forming an annular receiving groove between the sleeve 015 and the valve seat 05, and placing the solder 013 into the receiving groove between the valve seat 05 and the sleeve 015; the above-mentioned forming groove 052 can be performed in step S0 before step S1;

[0029] Step S2, placing the welding assembly consisting of the valve seat 05, the sleeve 015 and the solder 013 into a welding furnace for welding;

[0030] Step S3, assembling the core iron assembly, placing at least part of the core iron assembly in the sleeve 015.

[0031] Specifically, other components of the solenoid valve 100 are assembled with the welded components to form the solenoid valve 100 .

[0032] Specifically, in step S3, the static iron core 02, the moving iron core 04, the return spring 014, the first sealing block 012, the welded sleeve 015, and the valve seat 05 can be assembled, and step S4 can also be included, the sealing member 011 and the piston 06 are assembled together and installed into the valve seat 05, and then the return spring 07 is installed, and then the valve body 08 and the valve seat 05 are connected, and the two can be threadedly connected, and finally the drive coil 03 is assembled to the outer periphery of the sleeve 015 and fixed by the combination screw 01. It can be seen that the assembly order of the valve body 08 and the drive coil 03 is not limited.

[0033] Please combine Figure 6 , 7 Understanding, among others, Figure 7 for Figure 6 An enlarged view of the gap between the middle sleeve 015 and the valve seat 05.

[0034] In this embodiment, the inner wall 053 of the socket portion 05a of the valve seat 05 includes a gap wall section 053a and an interference fit wall section 053b distributed along the axial direction. In addition, the inner wall 053 of the socket portion 05a is provided with a step surface 054, and the step surface 054 is located below the interference fit wall section 053b, and the interference fit wall section 053b is connected to the step surface 054. Figure 6As shown, the diameter Ra of the gap wall section 053a is greater than the diameter Rb of the interference fit wall section 053b, and the size of the outer diameter Rc of the sleeve 015 is between the diameter Ra and the diameter Rb. After the sleeve 015 is inserted into the insertion hole 05a, the sleeve 015 and the interference fit wall section 053b are interference fit. When assembling in step 1, the sleeve 015 and the valve seat 05 are interference fit, and the interference amount is M. The sleeve 015 and the gap wall section 053a have a distance in the radial direction to form an annular gap 100a, and the width of the gap 100a in the radial direction is W2. In addition, the groove 052 opened on the bottom wall of the accommodating groove is connected to the insertion hole 05a, and correspondingly, it is also connected to the gap 100a. With such arrangement, when brazing is performed in a furnace, the solder 013 is located in the receiving groove after melting, and can flow into the gap 100a through the groove 052 opened on the bottom wall of the receiving groove, so as to increase the welding area of ​​the valve seat 05 and the sleeve 015. The groove 052 is opened here to facilitate the uniform distribution of the solder after melting. In addition, when the gap 100a is set, the molten solder can be introduced into the gap 100a as evenly as possible, reducing the disordered flow of the solder along the circumference to improve the uniformity of welding. After welding, the interference fit wall section 053b of the valve seat 05 and the sleeve 015 are interference fit. During the brazing process, the positions of the sleeve 015 and the valve seat 05 are relatively fixed. After brazing, the connection method of the sleeve 015 and the valve seat 05 includes both interference fit and welding. The combined connection method is more reliable, making the connection of the sleeve 015 and the valve seat 05 of different materials easier to achieve.

[0035] In detail, the welding furnace for brazing the valve seat 05 and the sleeve 015 in the aforementioned step 3 can be a tunnel furnace. For the tunnel furnace, the radial width W2 of the gap 100a between the gap wall section 053a and the sleeve 015 can be set to 0.05mm-0.2mm. Brazing is to heat the workpiece as a whole, the total heat is large, and the brazing time is relatively long, which can reach several minutes. After the solder 013 melts, there is enough time to penetrate into the gap 100a. At this time, the width W2 of the gap 100a can be set to a smaller size, such as 0.05mm-0.2mm. At the same time, the solder can fully penetrate, and because the sleeve 015 and the valve seat 05 are close to each other, it is more conducive to ensuring the reliability of welding.

[0036] In addition, in this embodiment, the wall thickness of the sleeve 015 is defined as t. Figure 7As shown, the gap wall section 053a has a height h1 along the axial direction, and the interference fit wall section 053b has a height h2 along the axial direction. The height h1 of the gap wall section 053a can satisfy: h1 = (2-6) t. That is, the wall thickness t of the sleeve 015 and the height h1 of the gap wall section 053a are associated and limited to further ensure the welding area of ​​the sleeve 015 and the valve seat 05 and improve the connection reliability. The wall thickness t of the sleeve 015 can be set to t≥0.3mm, which is conducive to the actual implementation of welding and interference fit. It can be seen that the length of the gap 100a along the axial direction is related to the height h1 of the gap wall section 053a. When the axial length of the socket part 05a is constant, the increase or decrease of the height h1 of the gap wall section 053a simultaneously affects the height h2 of the interference fit wall section 053b. The height h1 of the gap wall section 053a and the height h2 of the interference fit wall section 053b can be allocated and designed to achieve a better connection effect.

[0037] Look again Figure 6 In this embodiment, the radial width of the receiving groove is W1, the solder 013 has a circular cross-section, and the groove width W1 can be set to be larger than the diameter of the solder 013, and the diameter of the solder 013 is also not less than the outer diameter Rc of the sleeve 015. In this way, when the solder 013 is located in the receiving groove, the solder 013 can be in contact with the outer wall of the sleeve 015 and the inner wall of the receiving groove, or there can be a gap to avoid squeezing the solder 013 and causing the solder 013 to deform, thereby ensuring that the solder 013 can be relatively evenly melted in the circumferential direction during the welding process to reliably connect the sleeve 015 and the valve seat 05.

[0038] The axial depth of the receiving groove is h3, and the depth h3 can be smaller than the diameter Rc of the solder 013. In this way, it can be ensured that the receiving groove can be filled with molten solder, thereby ensuring sufficient contact with the sleeve 015 and the side wall of the receiving groove to ensure the welding effect.

[0039] The tunnel furnace generally has a preheating section and a brazing section. When welding in step 3 above, the following operations can be performed:

[0040] The assembled sleeve 015, valve seat 05, and solder 013 are first preheated in the preheating section, and the temperature of the preheating section can be set to 120°C ~ 250°C. After the above components are slowly heated in the preheating section, they are transported to the brazing section for brazing. The temperature of the brazing section can be set to 600°C ± 10°C. The transportation of the above assembled components is specifically driven by a mesh belt, and the speed of the mesh belt can be set to 400mm / min ~ 500mm / min.

[0041] During the welding process in the tunnel furnace, an inert gas such as argon can be introduced into the tunnel furnace to prevent oxidation during the welding process. In addition, the tunnel furnace is also equipped with a cooling chamber for cooling the workpiece after brazing. The above-mentioned components after welding can enter the cooling chamber for cooling. The cooling chamber includes a water cooling chamber and an air cooling chamber. The water cooling chamber has cooling water surrounding the periphery, and the air cooling chamber is cooled by passing air. The welded components can be cooled to about 200°C in the water cooling chamber, and then continue to cool to below 100°C in the air cooling chamber before being taken out of the furnace.

[0042] There are various specific forms of brazing. In addition to the above-mentioned tunnel furnace, the welding furnace can also be a vacuum furnace. As the name implies, the vacuum furnace needs to be evacuated to keep the welding under vacuum exchange. Different from the above-mentioned tunnel furnace, when brazing is performed in a vacuum furnace, the width of the gap 100a between the sleeve 015 and the valve seat 05 in the radial direction can be set to 0.05mm~0.15mm. Similarly, as a specific brazing furnace, the vacuum furnace still heats the workpiece as a whole, the total input heat is large, and the brazing time is long, which can reach several minutes. After the solder 013 melts, there is enough time to penetrate into the gap 100a. However, compared with the tunnel furnace, when brazing is performed in a vacuum furnace, the capillary action will be more obvious because it is performed in a vacuum environment, that is, the solder is easier to enter the gap 100a, then the gap 100a can be set to 0.05mm~0.15mm, that is, when using a vacuum furnace, the gap 100a can be set smaller, so that the welding is more reliable.

[0043] Similar to the tunnel furnace, when brazing is performed in a vacuum furnace, the height h1 of the gap wall section 053a along the axial direction satisfies: h1 = (2-6) t. However, as mentioned above, compared with the tunnel furnace, the capillary action is more obvious in the vacuum environment of the vacuum furnace, the solder infiltrates more fully into the gap 100a, and the welding effect is easily guaranteed, so the height h1 of the gap wall section 053a forming the gap 100a can be set relatively smaller, and the height h2 of the interference fit wall section 053b can be set larger, forming a longer interference fit section, thereby enhancing the reliability of the interference fit.

[0044] To ensure the brazing effect and prevent the presence of oil and impurities on the components from affecting the welding, the sleeve 015 and the valve seat 05 can be cleaned before welding. The cleaning lotion can be an organic solvent, such as ethanol, acetone, CCl4, etc. The cleaning method can be ultrasonic. After cleaning, the sleeve 015 and the valve seat 05 are immersed in 10% NaOH and 15% HNO3 solution to remove the oxide film, and then cleaned with anhydrous ethanol and dried, and then put into the tunnel furnace or vacuum furnace for brazing.

[0045] It should be noted that when brazing is performed in a vacuum furnace, magnesium powder or magnesium blocks can be placed in the vacuum furnace. The magnesium powder or magnesium blocks can remove the oxide film on the sleeve 015 and the valve seat 05. As mentioned above, after cleaning, the sleeve 015 and the valve seat 05 are immersed in a solution to remove the oxide film. However, during the process of entering the vacuum furnace, they may still be oxidized to form an oxide film. The provision of magnesium powder or magnesium blocks can reduce the oxide film on the valve seat 05 and the sleeve 015 after entering the vacuum furnace to ensure the quality of brazing. Specifically, the magnesium powder or magnesium block can be 15g / m 3 Add in proportion.

[0046] In addition, when brazing in a vacuum furnace in step 3, the following operations can be performed:

[0047] After placing the assembly consisting of the sleeve 015, the valve seat 05 and the solder 013 into a vacuum furnace, the mechanical pump is started to evacuate to a preset pressure, such as 0.135 Pa, and then the diffusion pump is started to make the vacuum degree reach a preset vacuum degree, such as 6.5×10 -3 Pa. It is difficult to achieve the vacuum required for brazing with only a vacuum pump, so a diffusion pump is provided to increase the vacuum to the required value.

[0048] After the vacuum degree meets the requirements, the components are heated. Specifically, the heating can be carried out in stages. The components can be heated for 45 to 60 minutes first, and heated to 450°C during this period. Then, the components are heated to a higher temperature for 30 to 45 minutes, and heated to 600±10°C during this period. After heating, the components are kept warm, and the holding time can be set to 5 to 10 minutes.

[0049] The above-mentioned time and vacuum setting values ​​can be set according to actual needs and are not limited to the above-mentioned values.

[0050] In addition, the hardness of the valve seat 05 after brazing may decrease, and the valve seat 05 may be subjected to aging treatment to increase the hardness, and specifically, the hardness may be increased by quenching treatment or other methods.

[0051] Please continue to refer to Figure 8 understand, Figure 8 This is a schematic diagram of another assembly of a valve seat 05 and a lower end of a sleeve 015 in an embodiment of the present application.

[0052] like Figure 8 As shown, the valve seat 05 is compared with Figure 6 The valve seat 05 in the embodiment has an inner wall portion located above the step surface 054 that is interference fit with the outer wall of the sleeve 015, that is, the gap 100a is no longer provided. This arrangement is also a combination of welding and interference fit, but the welding area is smaller than the above Figure 6Embodiment, but the area of ​​the interference fit is increased, and, in this embodiment, the bottom wall of the step groove 051 of the valve seat 05 is provided with a groove 052, which actually plays a similar role to the gap 100a. The inner wall of the socket portion 05a is set as the interference fit wall section 053b, and the processing of the valve seat 05 can be simpler.

[0053] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A method for manufacturing a solenoid valve, characterized in that: The solenoid valve comprises a core iron component, a sleeve and a valve seat, the core iron component comprises a moving iron core and a stationary iron core, the sleeve and the valve seat are made of different materials, and the manufacturing method comprises the following steps: Step S1, assembling the welding assembly: fixing the sleeve and the valve seat to form an annular receiving groove between the sleeve and the valve seat; placing solder into the receiving groove; Step S2, placing the welding assembly into a welding furnace for welding; Step S3, assembling the core iron assembly: placing at least a portion of the core iron assembly in the sleeve.

2. The method for manufacturing a solenoid valve according to claim 1, characterized in that: The step S3 comprises assembling the core iron assembly: Assembling the static iron core, the moving iron core, a return spring located between the moving iron core and the static iron core, and the welding assembly; After brazing, the method further includes step S4: assembling the piston and return spring of the electromagnetic valve with the valve seat, and then connecting the valve body and the valve seat; and assembling the drive coil to the outer periphery of the sleeve.

3. The method for manufacturing a solenoid valve according to claim 1, characterized in that: Before step S1, the method further includes step S0: forming a step groove on an end surface of the valve seat facing the core iron component; in step S1, the step groove and the sleeve cooperate to form the accommodating groove.

4. The method for manufacturing a solenoid valve according to claim 3, characterized in that: In step S0, a groove is also formed at the bottom of the step groove.

5. The method for processing a solenoid valve by brazing according to claim 4, characterized in that: The height of the groove along the axial direction is set to be no higher than 0.2 mm.

6. The method for manufacturing a solenoid valve according to any one of claims 1 to 5, characterized in that: A gap wall section and an interference fit wall section are formed on the inner wall of the valve seat, the sleeve is inserted into the valve seat, and the sleeve and the interference fit wall section are interference fit, the sleeve and the gap wall section have a gap in the radial direction, and the gap is connected to the accommodating groove.

7. The method for manufacturing a solenoid valve according to claim 6, characterized in that: Step S2 includes placing the welding assembly into a tunnel furnace, wherein the width of the gap in the radial direction is 0.05 mm to 0.2 mm; or placing the welding assembly into a vacuum furnace, wherein the width of the gap in the radial direction is 0.05 mm to 0.15 mm.

8. The method for manufacturing a solenoid valve according to claim 7, characterized in that: The welding assembly is preheated in the preheating section of the tunnel furnace, and then enters the brazing section of the tunnel furnace for welding. During the welding process, an inert gas is introduced into the tunnel furnace; after brazing, the welding assembly is transported to a cooling chamber for cooling; or, after the welding assembly is placed in the vacuum furnace, the pump is started to evacuate to a predetermined pressure, and then the pump is started again to make the vacuum degree reach a predetermined vacuum degree, and then the heating is performed for a first predetermined time, and then the heating is maintained for a second predetermined time, and finally the welding assembly is cooled with the furnace.

9. The method for manufacturing a solenoid valve according to claim 6, characterized in that: The wall thickness of the sleeve is t, and the height h1 of the slot wall segment in the axial direction satisfies: h1=(2-6)t.

10. The method for processing a solenoid valve by brazing according to any one of claims 1 to 5, characterized in that: The material of the valve seat is aluminum alloy, and the material of the sleeve is stainless steel.

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