Valve device

Abstract

A valve device comprises a valve seat and a sleeve, the sleeve comprises a main body part and a matching part, and the matching part protrudes outwards relative to the outer side wall of the main body part in the radial direction of the main body part; the valve seat comprises a limiting part, a first opening is formed in the upper wall of the valve seat, the limiting part surrounds the first opening, and the matching part and the limiting part are fixed through laser welding; through the arrangement, assembly of the electromagnetic valve is simplified, and the production efficiency of the electromagnetic valve is improved.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular to a valve device. Background Art

[0002] In the field of fluid control, the solenoid valve is a control component that controls whether the flow path is open or not. The solenoid valve includes a sleeve and a valve body. The sleeve is fixed and sealed with the valve body through assembly. How to simplify the structure of the solenoid valve and improve the assembly efficiency of the solenoid valve is a technical problem that needs to be solved. Summary of the invention

[0003] The purpose of the present application is to provide a valve device, which is conducive to simplifying the assembly of the solenoid valve and improving the production efficiency of the solenoid valve.

[0004] To achieve the above purpose, an implementation method of the present application adopts the following technical solution:

[0005] A valve device comprises a valve body and a sleeve, wherein the sleeve comprises a main body and a matching portion, wherein the matching portion protrudes outward relative to an outer side wall of the main body along a radial direction of the main body, and the matching portion is closer to the valve body than the main body;

[0006] The valve body comprises a limiting portion, the limiting portion is located at the upper end of the valve body, the valve body has a containing cavity, the containing cavity has a first port, the first port is located at the limiting portion, and the matching portion is welded and fixed to the valve body.

[0007] In an embodiment provided in the present application, the sleeve includes a matching portion, the valve seat includes a limiting portion and an upper wall of the valve seat, the upper wall of the valve seat has a first opening, the limiting portion surrounds the first opening, and the matching portion and the upper wall of the valve seat are laser welded. This arrangement is conducive to simplifying the assembly of the solenoid valve and improving the production efficiency of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic cross-sectional structural diagram of a first embodiment of a valve device provided by the present application;

[0009] Figure 2 yes Figure 1 Axonometric structural diagram of the middle casing;

[0010] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle valve seat;

[0011] Figure 4 is a schematic cross-sectional view of the matching of the sleeve and the valve seat in the second embodiment of the valve device;

[0012] Figure 5 yes Figure 4 Schematic diagram of the three-dimensional structure of the middle valve seat;

[0013] Figure 6 is a schematic cross-sectional view of the matching structure of the sleeve and the valve seat in the third embodiment of the valve device;

[0014] Figure 7 yes Figure 6 Schematic diagram of the three-dimensional structure of the middle casing;

[0015] Figure 8 is a schematic cross-sectional view of the matching structure of the sleeve and the valve seat in the fourth embodiment of the valve device;

[0016] Fig. 9 yes Figure 8 Schematic diagram of the three-dimensional structure of the middle valve seat;

[0017] Fig.10 is a schematic cross-sectional view of the matching structure of the sleeve and the valve seat in the fifth embodiment of the valve device;

[0018] Fig.11 yes Fig.10 Schematic diagram of the three-dimensional structure of the middle valve seat;

[0019] Fig.12 is a schematic cross-sectional view of the matching of the sleeve and the valve seat in the sixth embodiment of the valve device;

[0020] Fig.13 yes Fig.12 Schematic diagram of the three-dimensional structure of the middle casing.

[0021] Reference numerals:

[0022] 1. Valve body; 10. Valve seat; 100. Solenoid valve; 101. Valve seat body; 102. Valve seat upper wall; 11. First channel; 12. Second channel; 13. Valve port; 14. Accommodating cavity; 140. First port; 15. Limiting portion; 151. Guide wall; 152. Limiting bottom wall; 153. Step portion; 16. Limiting groove; 18. Guide groove; 19. Concave cavity;

[0023] 2. Valve core;

[0024] 3. Iron core assembly; 31. Static iron core; 32. Moving iron core;

[0025] 4. Coil assembly; 41. Coil portion; 42. Magnetic conductor;

[0026] 5. sleeve; 50. main body; 503. first mounting portion; 51. matching portion; 511. matching portion body; 512. guide portion;

[0027] 6. Screw 6; 61. Spacer;

[0028] 80. a first sealing member;

[0029] 90. Second sealing member. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0031] Combination Figure 1-Figure 3 As shown, a first embodiment of the solenoid valve 100 is schematically illustrated. In this embodiment, the solenoid valve 100 includes a valve body 1, a valve core 2, an iron core assembly 3, a coil assembly 4 and a sleeve 5, wherein at least a portion of the valve core 2 is located in the inner cavity of the valve body 1, at least a portion of the iron core assembly 3 is located above the valve core 2 and located on the inner periphery of the sleeve 5, the coil assembly 4 is located above the valve body 1 and is sleeved on the outer periphery of a portion of the iron core assembly 3 and a portion of the sleeve 5, along the axial direction of the solenoid valve 100, a portion of the sleeve 5 is located between the coil assembly 4 and the valve body 1, and the sleeve 5 is welded to the valve body 1.

[0032] Combination Figure 1 As shown, the valve body 1 has a housing cavity 14, and the housing cavity 14 has a first port 140 at the upper end of the valve body 1. The valve core 2 is located in the housing cavity 14 and can slide up and down along the cavity wall forming the housing cavity 14. Specifically, the valve body 1 includes a valve seat 10 and a valve body main body 101. Specifically, the first port 140 is opened at the upper end of the valve seat 10. The valve seat 10 is connected to the valve body main body 101 separately. Specifically, the cavity wall forming the housing cavity 14 includes the inner wall of the valve seat 10 and the inner wall of the valve body main body 101. The valve seat 10 and the valve body main body 101 are connected by threads. At least part of the valve seat 10 is located in the valve body main body 101 and is connected to the inner wall of the valve body main body 1 and sealed at the connection between the two. The connection method can be welding, riveting or threaded connection. Further, a first sealing member 80 is provided between the valve seat 10 and the valve body main body 101 to improve the sealing degree between the valve seat 10 and the valve body main body 101. Specifically, the separate setting of the valve seat 10 and the valve body 101 is conducive to the separate processing operations of the valve seat 10 and the valve body 101, so that the welding of the valve seat 10 and the sleeve 5 and the shape processing and hole processing of the valve body 101 can be carried out in a distributed manner, which is conducive to improving the overall production efficiency of the solenoid valve 100.

[0033] Combination Figure 1 As shown, at least part of the core assembly 3 is located above the valve core 2 and on the inner periphery of the sleeve 5. Specifically, the core assembly 3 includes a static core 31 and a moving core 32. At least part of the static core 31 is located in the sleeve 5 and fixed to the inner wall of the sleeve 5. The fixing method may be welding or riveting. At least part of the moving core 32 can move axially in the sleeve 5, and part of the moving core 32 can also move axially in the accommodating cavity 14, so that the moving core 32 contacts or separates from the valve core 2. In this embodiment, the moving core 32 is closer to the valve core 2 than the static core 31, or the moving core 32 is located below the static core 31. In other embodiments, the static core 31 may be closer to the valve core 2 than the moving core 32.

[0034] Combination Figure 1 As shown, the coil assembly 4 is sleeved on the outer circumference of part of the core assembly 3 and part of the sleeve 5. Specifically, the coil assembly 4 includes a coil portion 41 and a magnetizer 42. The coil portion 41 and the magnetizer 42 are fixed by snap-fitting. Both the coil portion 41 and the magnetizer 42 are provided with corresponding through holes, and the through hole of the coil portion 41 is coaxially arranged with the through hole of the magnetizer 42. At least part of the core assembly 3 and part of the sleeve 5 are located in the through holes of the coil portion 41 and the magnetizer 42.

[0035] Combination Figure 1 As shown, the solenoid valve 100 further includes a screw 6 and a gasket 61. In this embodiment, a specific connection mode between the coil assembly 4 and the valve body is provided. One end of the coil assembly 4 abuts against the valve body 1, and the other end of the coil assembly 4 is limitedly connected to the core assembly 3 through the screw 6 and the gasket 61. The screw 6 generates a pre-tightening force downward along the axis of the coil assembly 4, thereby making the coil assembly 4 abut against the valve body 1, and the coil assembly 4 and the valve body 1 are detachably connected. The valve body 1 also has a first channel 11, a second channel 12 and a valve port 13. The first channel 11 is connected to the accommodating chamber 14, and the valve port 13 can be connected to the accommodating chamber 14. The valve port 13 is connected to the second channel 12. Specifically, the coil assembly 4 is detachably connected to the valve seat 10. The first channel 11, the second channel 12 and the valve port 13 are opened in the valve body main body 101. The working medium can enter the accommodating chamber 14 from the first channel 11, and then, when the valve core 2 leaves the valve port 13, it enters the second channel 12 through the valve port 13. When the solenoid valve 100 is powered on or off, the moving iron core 32 can drive the valve core 2 to move in the accommodating cavity 14 along the axial direction of the solenoid valve 100 to open or close the valve port 13, so that the solenoid valve 100 is opened or closed.

[0036] Combination Figure 1 and Figure 2 As shown, the sleeve 5 includes a main body 50, a matching portion 51 and a first mounting portion 503. The main body 50 is formed into a centrally symmetrical tubular structure. The axial direction of the main body 50 is the axial direction of the sleeve 5, the radial direction of the main body 50 is the radial direction of the sleeve 5, and the tubular circumferential direction of the main body 50 is the circumferential direction of the sleeve 5. Along the axial direction of the sleeve 5, at least part of the main body 50 is located above the valve body 1, the matching portion 51 is located at one end of the main body 50, or in other words, the matching portion 51 is closer to the valve body 1 than the main body 50, and the first mounting portion 503 is located at the other end of the main body 50, and the matching portion 51 is closer to the valve body 1 than the first mounting portion 503. At least part of the static iron core 31 is located in the inner cavity of the sleeve 5, and the static iron core 31 is connected to the inner circumferential wall of the first mounting portion 503 and sealed at the connection between the two, and the connection method can be welding or bonding.

[0037] Combination Figure 1 and Figure 3As shown, the valve body 1 has a limiting portion 15, which is arranged on the upper wall 102 of the valve seat, and the limiting portion 15 is distributed along the circumference of the first port 140. The solenoid valve 100 is provided with a matching portion 51 and a limiting portion 15, and the matching portion 51 is connected to the limiting portion 15 and fixed at the connection between the two by laser welding and the connection is sealed, so that the sleeve 5 is fixed to the valve seat 10, which simplifies the overall structure of the solenoid valve 100, improves the assembly efficiency in the production process of the solenoid valve 100, and reduces the production cost of the solenoid valve 100; in addition, when the coil assembly 4 is installed on the outside of the sleeve 5, in the axial direction of the sleeve 5, the overlap height of the coil assembly 4 and the iron core assembly 3 is increased, and the degree of utilization of the magnetic field of the coil assembly 4 by the static iron core 31 or the moving iron core 32 partially located inside the accommodating cavity 14 is increased, thereby effectively reducing the working power of the coil assembly 4 and achieving the effect of reducing the cost of the coil assembly. In this embodiment, the matching portion 51 is laser welded to the upper wall 102 of the valve seat, and at the same time, the laser welded weld between the matching portion 51 and the upper wall 102 of the valve seat realizes the sealed connection between the sleeve 5 and the valve seat 10. In other embodiments, when the matching portion 51 is connected to the limiting portion 15, a second sealing member 90 is provided between the matching portion 51 and the limiting portion 15 to improve the sealing degree between the sleeve 5 and the valve seat 10, thereby avoiding leakage or welding penetration between the sleeve 5 and the valve seat 10, which may cause leakage of the solenoid valve 100. Furthermore, the second seal 90 is spaced apart from the upper end of the outer ring side wall of the mating part 51. Specifically, the space between the second seal 90 and the side wall of the mating part 51 is filled with a portion of the valve seat 10 to limit the second seal 90, thereby preventing the second seal 90 from shifting under the impact of the working medium. Furthermore, the space between the second seal 90 and the side wall of the mating part 51 is filled with air or other insulating media. Since the thermal conductivity of air or other insulating media is weaker than that of the material of the valve seat 10, the heat generated during laser welding of the mating part 51 and the upper wall 102 of the valve seat can be effectively prevented from damaging the second seal 90.

[0038] Combination Figure 2 As shown, the matching portion 51 is fixedly arranged with the sleeve 5. Along the axial direction of the sleeve 5, the matching portion 51 is located at one end of the sleeve 5 close to the valve seat 10. The matching portion 51 protrudes relative to the side wall of the sleeve 5 and is distributed along the circumference of the sleeve 5. Specifically, the matching portion 51 is located on the outer side wall of the main body 50. The matching portion 51 protrudes outward from the outer side wall of the main body 50, and the matching portion 51 is distributed along the circumference of the outer side wall of the main body 50. In this embodiment, the matching portion 51 and the main body 50 are an integral structure; in other embodiments, the matching portion 51 can also be separately arranged with the main body 50, and the matching portion 51 and the main body 50 can be fixed by welding or bonding, which will not be described in detail.

[0039] Combination Figure 2 , Figure 4 and Figure 5 As shown, in the second embodiment of the solenoid valve 100, relative to the improvement of the first embodiment, in this embodiment, the valve seat 10 includes a limiting groove 16, the valve seat upper wall 102 is recessed downward to form the limiting groove 16, the limiting groove 16 includes a guide wall 151 and a limiting bottom wall 152, along the axial direction of the main body 50, the guide wall 151 is located between the limiting bottom wall 152 and the valve seat upper wall 102, and connects the two, the first port 140 is opened in the limiting portion 15, and the guide wall 151 is distributed along the circumference of the first port 140; in this embodiment, the matching portion 51 cooperates with the limiting groove 16 to make the sleeve 5 and the valve seat 10 relatively fixed. Specifically, the matching portion 51 is located in the limiting groove 16, wherein the inner wall of the limiting groove 16 includes a limiting bottom wall 152 and a guide wall 151. In the axial direction of the sleeve 5, at least part of the matching portion 51 is located between the limiting bottom wall 152 and the valve seat upper wall 102, and the matching portion 51 abuts against the limiting bottom wall 152. Since the matching portion 51 is fixed to the main body 50, the sleeve 5 and the valve seat 10 are limited in the axial direction of the solenoid valve 100. Furthermore, along the axial direction of the main body 50, the matching portion 51 is The lower end abuts against the limiting bottom wall 152, and the outer ring side wall of the matching portion 51 abuts against the guide wall 151. Because the matching portion 51 is fixed to the main body 50, the sleeve 5 and the valve seat 10 form a limit in the axial direction and radial direction of the solenoid valve 100. Furthermore, the matching portion 51 and the wall forming the limiting groove 16 are interference fit, or in other words, the matching portion 51 is tightly fit to the inner wall forming the limiting groove 16, and the sleeve 5 and the valve seat 10 can be fixed in the axial direction and radial direction of the solenoid valve 100 by static friction.

[0040] Combination Figures 5 to 7 As shown, in the third embodiment of the solenoid valve 100, relative to the improvement of the second embodiment, in this embodiment, the matching portion 51 includes a matching portion body 511 and a guide portion 512, the guide portion 512 is located on the lower surface of the matching portion body 511 and protrudes toward the valve seat 10, specifically, the guide portion 512 and the matching portion body 511 are an integral structure, and the guide portion 512 extends from the matching portion body 511 approximately along the axial direction of the main body 50 in a direction away from the main body 50. The guide portion 512 is continuously distributed along the circumference of the main body 50, or in other words, the guide portion 512 is folded downward relative to the matching portion body 511, the guide portion 512 is folded toward the valve seat 10 relative to the matching portion body 511, the matching portion body 511 and the guide portion 512 are approximately perpendicular, and in addition, there may be a rounded transition between the matching portion body 511 and the guide portion 512. The matching portion 511 and the guide portion 512 are clearance-matched or transition-matched with the inner wall forming the limiting groove 16. The matching portion 511 and the guide portion 512 cooperate with the limiting groove 16 to further limit the radial movement between the sleeve 5 and the valve seat 10, which is beneficial to improve the coaxiality between the sleeve 5 and the valve seat 10 when the sleeve 5 is installed. Furthermore, the matching portion 511 and the guide portion 512 are interference-matched with the inner wall forming the limiting groove 16.

[0041] Combination Figures 7 to 9 As shown, in the fourth embodiment of the solenoid valve 100, relative to the improvement of the third embodiment, in this embodiment, the valve seat 10 further has a guide groove 18, the guide groove 18 is annular, and the opening of the guide groove 18 is formed on the limiting bottom wall 152. The matching part body 511 and the inner wall forming the limiting groove 16 are clearance matched or transition matched, and the guide part 512 and the inner wall forming the guide groove 18 are clearance matched or transition matched, and the guide part 512 and the guide groove 18 cooperate with each other to further limit the radial movement between the sleeve 5 and the valve seat 10, which is conducive to improving the coaxiality of the sleeve 5 with the valve seat 10 when installing. Furthermore, the matching part body 511 and the inner wall forming the limiting groove 16 are interference matched, and the guide part 512 and the inner wall forming the guide groove 18 are interference matched.

[0042] In this embodiment, while the matching portion 51 is located in the limiting groove 16 , the matching portion body 511 and the valve seat upper wall 102 are fixed by laser welding, and the welding seam therebetween seals the sleeve 5 and the valve seat 10 .

[0043] Combination Figure 7 , Fig.10 and Fig.11 As shown, in the fifth embodiment of the solenoid valve 100, relative to the improvement of the first embodiment, in this embodiment, the valve seat 10 further has a guide groove 18, the guide groove 18 is annular, and the opening of the guide groove 18 is formed at the limiting portion 15. The guide portion 512 is clearance-matched or transition-matched with the inner wall forming the guide groove 18, and the guide portion 512 and the guide groove 18 cooperate with each other to further limit the radial movement between the sleeve 5 and the valve seat 10, which is conducive to improving the coaxiality between the sleeve 5 and the valve seat 10 when installing. Furthermore, the guide portion 512 is interference-matched with the inner wall forming the guide groove 18.

[0044] In this embodiment, while the matching portion 51 is located in the limiting groove 16 , the matching portion body 511 and the valve seat upper wall 102 are fixed by laser welding, and the welding seam therebetween seals the sleeve 5 and the valve seat 10 .

[0045] Combination Figure 5 , Fig.12 and Fig.13As shown, in the sixth embodiment of the solenoid valve 100, relative to the improvement of the third embodiment, in this embodiment, the guide portion 512 can also be located on the upper surface of the mating portion body 511 and protrude toward the main body 50 approximately along the axial direction of the main body 50, and the angle between the mating portion body 511 and the guide portion 512 is greater than or equal to ninety degrees. The mating portion body 511 and the guide portion 512 can also have a rounded transition, and the guide portion 512 and the guide wall 151 have a clearance fit, transition or interference fit. When the sleeve 5 and the valve seat 10 are assembled, since the matching part body 511 is folded upward to form the guide part 512, and the angle between the two is greater than or equal to ninety degrees, the diameter of the guide part 512 gradually increases from bottom to top, and in the axial direction of the sleeve 5, the matching part body 511 first enters the limiting groove 16. Since the matching part body 511 and the guide part 512 are integrally connected, the matching part body 511 guides the upwardly folded guide part 512 to enter the limiting groove 16, and the pressure between the side wall of the guide part 512 and the guide wall 151 gradually increases, so that the guide part 512 and the limiting groove 16 are interference fit, thereby reducing the resistance during the assembly process of the guide part 512 and the limiting groove 16. Because the guide part 512 is fixed to the first assembly part 51, and the first assembly part 51 is fixed to the sleeve 5, it is convenient to reduce the assembly resistance of the sleeve 5 and the valve seat 10.

[0046] In this embodiment, while the matching portion 51 is located in the limiting groove 16 , the guide portion 512 and the valve seat upper wall 102 are fixed by laser welding, and the welding seam therebetween seals the sleeve 5 and the valve seat 10 .

[0047] Combination Figure 1 , Figure 4 , Figure 6 , Figure 8 , Fig.10 and Fig.12 As shown, compared with the above six embodiments of the solenoid valve 100, the valve seat 10 further has a concave cavity 19, and the concave cavity 19 has an opening in the limiting portion 15. The solenoid valve 100 also includes a second sealing member 90, and the second sealing member 90 is located in the concave cavity 19. In the first two embodiments, the second sealing member 90 is pressed against the matching portion 51 and the limiting portion 15, and the second sealing member 90 is respectively in contact with the matching portion body 511 and the limiting portion 15. In the latter embodiments, the concave cavity 19 has an opening in the limiting bottom wall 152, and the second sealing member 90 is pressed against the matching portion 51 and the limiting bottom wall 152, and the second sealing member 90 is respectively in contact with the matching portion body 511 and the limiting bottom wall 152, which is conducive to improving the sealing performance of the connection between the sleeve 5 and the valve seat 10.

[0048] Specifically, the concave cavity 19 is located between the guide wall 151 and the first port 140, the concave cavity 19 is concentrically arranged with the limiting portion 15, the limiting portion 15 includes a step portion 153, along the radial direction of the first port 140, the step portion 153 is closer to the first port 140 than the concave cavity 19, the upper wall of the step portion 153 abuts against the lower wall of the matching portion body 511 of the matching portion 51, and the upper wall of the matching portion body 511 of the matching portion 51 is substantially flush with the upper wall of the valve seat 10; such an arrangement is conducive to improving the coaxiality of the valve seat 10 and the sleeve 5 due to the supporting effect of the step portion 153 on the matching portion body 511 of the matching portion 51;

[0049] Furthermore, the concave cavity 19 and the outer ring of the limiting portion 15 are spaced apart. Specifically, the space between the concave cavity 19 and the guide wall 151 is filled with a portion of the valve seat 10 to limit the second sealing member 90, thereby preventing the second sealing member 90 from shifting under the impact of the working medium. Furthermore, the space between the second sealing member 90 and the guide wall 151 is filled with air or other insulating media. Since the thermal conductivity of air or other insulating media is weaker than that of the material of the valve seat 10, it is possible to effectively avoid damage to the second sealing member 90 caused by the heat generated during laser welding of the mating portion 51 and the upper wall 102 of the valve seat.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this description.

[0051] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A valve device, characterized in that: The valve seat (10) and the sleeve (5) are provided. The sleeve (5) comprises a main body (50) and a matching portion (51). In the radial direction of the main body (50), the matching portion (51) protrudes outward relative to the outer side wall of the main body (50). The valve seat (10) comprises a limiting portion (15) and a valve seat upper wall (102); the valve seat upper wall (102) has a first opening (140); the limiting portion (15) surrounds the first opening (140); and the matching portion (51) and the limiting portion (15) are fixed by laser welding.

2. The valve device according to claim 1, characterized in that The limiting portion (15) has a limiting groove (16), and the limiting groove (16) has an opening on the upper wall (102) of the valve seat. The limiting portion (15) includes a guide wall (151) and a limiting bottom wall (152). Along the axial direction of the main body (50), the guide wall (151) is located between the limiting bottom wall (152) and the upper wall (102) of the valve seat, and the limiting bottom wall (152) abuts against the lower wall of the matching portion (51). The guide wall (151) and / or the upper wall (102) of the valve seat are fixed to the matching portion (51) by laser welding.

3. The valve device according to claim 2, characterized in that The upper wall of the matching portion (51) is substantially flush with the upper wall (102) of the valve seat, the matching portion (51) is fixed to the upper wall (102) of the valve seat by laser welding, and the matching portion (51) is fixed to the guide wall (151) by laser welding.

4. The valve device according to claim 2, characterized in that The matching portion (51) further comprises a matching portion body (511) and a guide portion (512), wherein the guide portion (512) extends from the matching portion body (511) in a direction close to the main body (50), and the extending direction of the guide portion (512) is substantially the same as the axial direction of the main body (50); The limiting bottom wall (152) abuts against the lower wall of the matching portion body (511), and the guiding portion (512) is fixed to the guiding wall (151) and / or the valve seat upper wall (102) by laser welding.

5. The valve device according to claim 4, characterized in that The upper end wall of the guide portion (512) is substantially flush with the valve seat upper wall (102), and the guide portion (512) is fixed to the valve seat upper wall (102) and the guide wall (151) by laser welding.

6. The valve device according to claim 2, characterized in that The matching portion (51) further comprises a matching portion body (511) and a guide portion (512), wherein the guide portion (512) extends from the matching portion body (511) in a direction away from the main body (50), and the extending direction of the guide portion (512) is substantially the same as the axial direction of the main body (50); The limiting bottom wall (152) abuts against the lower wall of the guide portion (512), and the matching portion body (511) is fixed to the guide wall (151) and / or the valve seat upper wall (102) by laser welding, or the guide portion (512) is fixed to the valve seat upper wall (102) by laser welding, and the guide portion (512) is fixed to the guide wall (151) by laser welding.

7. The valve device according to claim 6, characterized in that The upper wall of the matching portion body (511) is substantially flush with the upper wall (102) of the valve seat, and the guide portion (512) is fixed to the guide wall (151) and / or the upper wall (102) of the valve seat by laser welding.

8. The valve device according to claim 6 or 7, characterized in that The valve seat (10) has a guide groove (18), and the guide groove (18) has an opening in the limiting bottom wall (152); the lower wall of the matching part body (511) abuts against the upper wall of the limiting bottom wall (152), and the guide part (512) is located in the guide groove (18).

9. The valve device according to claim 1, characterized in that The matching portion (51) further comprises a matching portion body (511) and a guide portion (512), wherein the guide portion (512) extends from the matching portion body (511) in a direction away from the main body (50), and the extending direction of the guide portion (512) is substantially the same as the axial direction of the main body (50); The upper wall of the limiting portion (15) abuts against the lower wall of the guiding portion (512), the guiding portion (512) is fixed to the upper wall (102) of the valve seat by laser welding, and the guiding portion (512) is fixed to the side wall of the guiding groove (18) by laser welding.

10. The valve device according to claim 9, characterized in that The valve seat (10) has a guide groove (18), and the guide groove (18) has an opening in the limiting portion (15); the lower wall of the matching portion body (511) abuts against the upper wall of the limiting portion (15), and the guide portion (512) is located in the guide groove (18).

11. The valve device according to any one of claims 1 to 10, characterized in that: The valve device comprises a second sealing member (90), the second sealing member (90) being pressed between the matching portion (51) and the limiting portion (15), the second sealing member (90) surrounding the first port (140) and being located radially outside the first port (140); The valve seat (10) has a concave cavity (19), the concave cavity (19) has an opening in the limiting portion (15), and at least a portion of the second sealing member (90) is located in the concave cavity (19).

12. The valve device according to claim 11, characterized in that The limiting portion (15) includes a step portion (153). Along the radial direction of the first port (140), the step portion (153) is closer to the first port (140) than the concave cavity (19). The upper wall of the step portion (153) abuts against the lower wall of the matching portion body (511) of the matching portion (51), and the upper wall of the matching portion body (511) of the matching portion (51) is roughly flush with the upper wall of the valve seat (10).

13. The valve device according to any one of claims 11 or 12, characterized in that: The second sealing member (90) abuts against the matching portion (51), the second sealing member (90) abuts against the limiting portion (15), and the second sealing member (90) is spaced apart from an upper end surface of an outer peripheral side wall of the matching portion (51).

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