Valve device and manufacturing method thereof

Abstract

The valve device comprises a valve component and a valve body component, the valve component comprises a valve element assembly and a valve seat, the valve seat is provided with an assembly cavity, the valve element assembly is at least partially located in the assembly cavity, and the valve element assembly is connected with the valve seat. The valve body component is provided with a mounting cavity, at least part of the valve seat is located in the mounting cavity, the valve body component comprises a fixing part, the valve seat comprises a connecting part, the fixing part is provided with a fixing groove, at least part of the connecting part is located in the fixing groove, and the connecting part and the groove wall of the fixing groove are welded and fixed. The valve body component comprises the fixing part, the valve seat comprises the connecting part, the fixing part is provided with the fixing groove, at least part of the connecting part is located in the fixing groove, and the connecting part and the groove wall of the fixing groove are welded and fixed, so that sealing and fixed connection of the valve body component and the valve seat are achieved, and the groove wall of the fixing groove has a built-in effect on the connecting part; and the connection stability and the sealing performance are better.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, and in particular to a vehicle valve device and its manufacturing method. Background Technology

[0002] In related technologies, valve devices include valve components and valve body components. The valve component includes a valve core assembly and a valve seat. The valve seat has an assembly cavity, and the valve core assembly is at least partially located in the assembly cavity, connecting to the valve seat. The valve body component has a mounting cavity, and the valve seat is at least partially located in the mounting cavity. The valve body component and valve seat are typically connected by threads; however, threaded connections are prone to fluid leakage. Therefore, a seal is usually installed between the valve body component and the valve seat to improve the sealing performance of the connection. The connection method between the valve body component and the valve seat is relatively complex and has poor connection stability. Summary of the Invention

[0003] In view of the above-mentioned problems in the related technologies, this application provides a valve device and a method for manufacturing the same, which aims to improve the sealing performance and stability of the connection between the valve body components and the valve seat.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] A valve device includes a valve component and a valve body component, the valve component including a valve core assembly and a valve seat, the valve seat having an assembly cavity, the valve core assembly being at least partially located in the assembly cavity, and the valve core assembly being connected to the valve seat;

[0006] The valve body component has a mounting cavity, the valve seat is at least partially located in the mounting cavity, the valve body component includes a fixing part, the valve seat includes a connecting part, the fixing part has a fixing groove, the connecting part is at least partially located in the fixing groove, and the connecting part is welded and fixed to the groove wall of the fixing groove.

[0007] In this application, the valve body component includes a fixing part, and the valve seat includes a connecting part. The fixing part has a fixing groove, and the connecting part is at least partially located in the fixing groove. The connecting part is welded and fixed to the groove wall of the fixing groove, thereby achieving a sealed and fixed connection between the valve body component and the valve seat. Moreover, the groove wall of the fixing groove has a locking effect on the connecting part, which provides better connection stability and sealing performance compared to threaded connections.

[0008] To achieve the above objectives, this application also adopts the following technical solution:

[0009] A method for manufacturing a valve device includes the following steps:

[0010] A valve seat and a valve body assembly are provided, the valve body assembly having a mounting cavity, the valve seat being assembled into the mounting cavity, and the valve body assembly being in a limiting fit with the valve seat;

[0011] The valve body component includes a first fixing part, the valve seat includes a connecting part, and a filler region is provided between the first fixing part and the connecting part to provide solder and fill the filler region with the solder.

[0012] The first fixing part and the connecting part are laser welded. After the laser melts the solder and part of the first fixing part, it is cooled and solidified to form the fixing part. The fixing part has a fixing groove, and the connecting part is at least partially located in the fixing groove. The connecting part is welded and fixed to the groove wall of the fixing groove.

[0013] In this application, the valve body component includes a first fixing part, and the valve seat includes a connecting part. The first fixing part and the connecting part are laser welded. After the laser melts the solder and part of the first fixing part, it cools and solidifies to form the fixing part. The fixing part has a fixing groove, and the connecting part is at least partially located in the fixing groove. The connecting part is welded and fixed to the groove wall of the fixing groove, thereby achieving a sealed and fixed connection between the valve body component and the valve seat. Moreover, the groove wall of the fixing groove has a embedding effect on the connecting part. Compared with the threaded connection, the connection stability and sealing performance are better. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the valve device of this application;

[0015] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the valve device shown;

[0016] Figure 3 yes Figure 1 A cross-sectional schematic diagram and a partial enlarged view of the valve device shown;

[0017] Figure 4 yes Figure 1 A three-dimensional structural diagram of the valve body components and valve seat of the valve device shown;

[0018] Figure 5 yes Figure 1 A cross-sectional schematic diagram of the valve body and valve seat of the valve device shown;

[0019] Figure 6 yes Figure 1 The diagram shows cross-sectional views of the valve body and valve seat components of the valve device before and after laser welding.

[0020] Figure 7 yes Figure 1 The diagram shows cross-sectional views of the valve body and valve seat of the valve device before and after laser welding.

[0021] In the figure, 10 is the drive component; 11 is the outer casing; 111 is the housing cavity; 12 is the stator assembly; 13 is the circuit board; 20 is the valve component; 21 is the valve core assembly; 211 is the valve core component; 212 is the valve core seat; 2121 is the valve port; 22 is the valve seat; 221 is the assembly cavity; 222 is the connecting part; 2221 is the first side wall; 2222 is the second side wall; 223 is the main body; 2231 is the first outer side wall; 2232 is the second step part; 23 is the rotor assembly; 24 is the lead screw; 25 is the sleeve; 30 is the valve body component; 31 is the mounting cavity; 32 is the fixing part; 321 is the fixing groove; 33 is the first fixing part; 331 is the third side wall; 34 is the main body; 341 is the first inner side wall; 342 is the first step part. Detailed Implementation

[0022] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] It should be understood that the described embodiments are merely some embodiments of this application, and not all embodiments. All other technical solutions obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The valve device of the exemplary embodiments of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features in the implementation methods can complement or combine with each other.

[0024] Valve devices can be applied to vehicle thermal management systems or air conditioning systems, especially in circulation systems using CO2 as a refrigerant. Vehicle thermal management systems include those for new energy vehicles, where valve devices are commonly used as throttling or switching elements. In related technologies, a valve device includes a valve component 20 and a valve body component 30. The valve component 20 includes a valve core assembly 21 and a valve seat 22. The valve seat 22 has an assembly cavity 221, and the valve core assembly 21 is at least partially located in the assembly cavity 221, connecting to the valve seat 22. The valve body component 30 has a mounting cavity 31, and the valve seat 22 is at least partially located in the mounting cavity 31. The valve body component 30 and the valve seat 22 are typically connected by threads. However, threaded connections are prone to fluid leakage; therefore, a seal is usually provided between the valve body component 30 and the valve seat 22 to improve the sealing performance of the connection. Threaded connections also require machining threads at the connection point between the valve body component 30 and the valve seat 22, requiring high machining precision. Therefore, the connection between valve body component 30 and valve seat 22 is relatively complex, which is not conducive to industrial production, the connection stability is also poor, and the material cost is high.

[0025] According to one possible embodiment of the valve device of this application, referring to 1 to 2008. Figure 7As shown, a valve device includes a valve component 20 and a valve body component 30. The valve component 20 includes a valve core assembly 21 and a valve seat 22. The valve seat 22 has an assembly cavity 221. The valve core assembly 21 is at least partially located in the assembly cavity 221 and is connected to the valve seat 22.

[0026] The valve body component 30 has a mounting cavity 31, and the valve seat 22 is at least partially located in the mounting cavity 31. The valve body component 30 includes a fixing part 32, and the valve seat 22 includes a connecting part 222. The fixing part 32 has a fixing groove 321, and the connecting part 222 is at least partially located in the fixing groove 321. The connecting part 222 is welded and fixed to the groove wall of the fixing groove 321.

[0027] In this application, the valve body component 30 includes a fixing part 32, and the valve seat 22 includes a connecting part 222. The fixing part 32 has a fixing groove 321, and the connecting part 222 is at least partially located in the fixing groove 321. The connecting part 222 is welded and fixed to the groove wall of the fixing groove 321, thereby achieving a sealed and fixed connection between the valve body component 30 and the valve seat 22. Compared with the method of using a threaded connection and sealing element to seal the valve body component 30 and the valve seat 22, the connection stability is better, and the groove wall of the fixing groove 321 has a embedding effect on the connecting part 222, further enhancing the connection stability. Moreover, the welding fixation eliminates the need for a sealing element at the connection between the connecting part 222 and the fixing part 32, while still providing good sealing performance, thereby reducing material costs and facilitating industrial production.

[0028] Reference Figures 3 to 7 As shown, the valve body component 30 includes a main body portion 34, which is integrally formed with the fixing portion 32. The fixing portion 32 protrudes from the main body portion 34 towards the connecting portion 222. On a plane perpendicular to the axial direction of the valve device, the projection of the fixing portion 32 is annular. The cross-section of the fixing portion 32 is clamp-shaped, which effectively secures the connecting portion 222, improving the connection stability and sealing performance between the fixing portion 32 and the connecting portion 222. This, in turn, improves the connection stability and sealing performance between the valve body component 30 and the valve seat 22. The valve seat 22 includes a body portion 223, which is integrally formed with the connecting portion 222. The connecting portion 222 protrudes from the body portion 223 towards the fixing portion 32. On a plane perpendicular to the axial direction of the valve device, the projection of the connecting portion 222 is annular.

[0029] The melting point of valve seat 22 is higher than that of valve body component 30. Valve seat 22 is made of stainless steel, and valve body component 30 is made of aluminum alloy. Valve seat 22 and valve body component 30 are both integral structures, resulting in good overall structural stability. It should be noted that the method of forming the integral structure is not specifically limited. It can be formed through one or a combination of stamping, extrusion, casting, powder metallurgy, metal powder injection molding, 3D printing, etc. Alternatively, it can be formed by stamping, extrusion, casting, powder metallurgy, or metal powder injection molding followed by machining, or it can be formed directly by machining.

[0030] In this application, the connecting part 222 and the fixing part 32 are fixed by laser welding. Preferably, the connecting part 222 and the fixing part 32 are connected and sealed by laser brazing technology. Laser brazing technology achieves the connection and sealing of the components by strictly controlling the welding heat input and utilizing their different melting points. The aluminum alloy and solder melt and solidify while the stainless steel does not melt. The molten aluminum alloy and solder together wet and spread on the stainless steel base material, and finally, the weldment is achieved by the mutual diffusion and bonding of the liquid and solid phases. Compared with threaded connections, this method is relatively low-cost, highly efficient, easy to automate, achieves good welding results, and has good sealing performance, reducing the possibility of fluid leakage. Therefore, the connection stability and sealing performance of the valve body component 30 and the valve seat 22 are good, which is conducive to industrial production and reduces costs.

[0031] Reference Figure 3 As shown, the main body 34 includes a first inner sidewall 341, and the body portion 223 includes a first outer sidewall 2231. The first inner sidewall 341 abuts against the first outer sidewall 2231, and the first inner sidewall 341 and the first outer sidewall 2231 are press-fitted together. The first inner sidewall 341 and the first outer sidewall 2231 are also in a limiting fit, thereby limiting the fit between the main body 34 and the body portion 223, which helps to improve the connection stability and sealing performance of the valve body component 30 and the valve seat 22.

[0032] Specifically, in this embodiment, the length of the interference fit section between the first inner sidewall 341 and the first outer sidewall 2231 is between 1 mm and 2 mm. The interference amount of the interference fit section between the first inner sidewall 341 and the first outer sidewall 2231 is between 0 mm and 0.04 mm. The reasonable structural parameter design allows the first inner sidewall 341 and the first outer sidewall 2231 to fit tightly and is also easy to assemble.

[0033] Reference Figure 3As shown, the main body 34 includes a first stepped portion 342, and the main body 223 includes a second stepped portion 2232. Both the first stepped portion 342 and the second stepped portion 2232 are annular. Along the axial direction of the valve device, the first stepped portion 342 and the second stepped portion 2232 abut against each other. This abutment between the first stepped portion 342 and the second stepped portion 2232 ensures accurate positioning of the valve body component 30 and the valve seat 22 before laser welding, thereby guaranteeing the welding effect of the laser welding between the connecting portion 222 and the fixing portion 32, and further improving the connection stability and sealing performance of the valve body component 30 and the valve seat 22.

[0034] Reference Figures 1 to 3 As shown, the valve device includes a drive component 10, which is electrically and / or signal-connected to the valve component 20. The drive component 10 includes a housing 11 with a housing cavity 111. The valve component 20 is at least partially located in the housing cavity 111, and the valve body component 30 is fixedly connected to the housing 11. Specifically, both the valve body component 30 and the housing 11 are provided with bolt holes, and the valve body component 30 and the housing 11 are fixedly connected by bolts, facilitating disassembly of the valve body component 30 and the housing 11 and subsequent maintenance of components. The housing 11 includes a housing body and an end cap, which are fixedly connected.

[0035] Valve component 20 includes a rotor assembly 23, a lead screw 24, and a sleeve 25. The sleeve 25 is fitted around the outer periphery of the rotor assembly 23. The drive component 10 can drive the rotor assembly 23 to rotate relative to the sleeve 25. The rotor assembly 23 is located inside the sleeve 25. The lead screw 24 is at least partially located inside the sleeve 25. Valve component 20 also includes a bearing located between the valve seat 22 and the lead screw 24. Both the valve seat 22 and the lead screw 24 are provided with limiting parts that limit the bearing, and both the valve seat 22 and the lead screw 24 are mutually limiting and engaged with the bearing. One end of the lead screw 24 is fixedly connected to the rotor assembly 23, and the other end of the lead screw 24 is connected to the valve core assembly 21.

[0036] The drive component 10 includes a stator assembly 12 and a circuit board 13, both located in the housing cavity 111. The stator assembly 12 and the circuit board 13 are electrically and / or signal connected. The stator assembly 12 is sleeved on the outer periphery of the sleeve 25 and is fixedly or partially connected to the housing 11. The valve core assembly 21 includes a valve core element 211 and a valve core seat 212. The valve core seat 212 is fixedly or partially connected to the valve seat 22 or is an integral structure. The valve component 20 also includes a first sealing element located between the valve core seat 212 and the valve seat 22. The valve core seat 212 and the valve seat 22 are sealed together by the first sealing element, thereby improving the sealing performance between the valve core seat 212 and the valve seat 22 and reducing the risk of fluid leakage between them. The valve core seat 212 is limitedly connected to the valve body component 30. The valve component 20 also includes a second seal, which is located between the valve core seat 212 and the valve body component 30. The valve core seat 212 and the valve body component 30 are sealed together by the second seal, thereby improving the sealing performance between the valve core seat 212 and the valve body component 30 and reducing the risk of fluid leakage between them. The lead screw 24 is threadedly connected to the valve core component 211, and the lead screw 24 is drivenly connected to the valve core component 211. The valve body component 30 is bolted to the outer casing 11. The valve core seat 212 has a valve port 2121, and the valve core component 211 can adjust the opening degree of the valve port 2121. The valve body component 30 has a first channel and a second channel, both of which are connected to the outside. The first channel is connected to the valve port 2121. The valve core seat 212 has a flow side hole, which is connected to the valve port 2121 and the second channel.

[0037] Specifically, when the valve device is working, the drive component 10 is connected to the power supply. After the stator assembly 12 is energized, it magnetically engages with the rotor assembly 23, driving the rotor assembly 23 to rotate, thereby driving the lead screw 24 to move. The lead screw 24 can drive the valve core 211 to move closer to or further away from the valve port 2121 to adjust the opening degree of the valve port 2121. This allows for throttling of the working medium at the valve port 2121. The opening degree of the valve port 2121 is defined as 0% to 100%. When the valve core 211 closes the valve port 2121, the opening degree of the valve port 2121 is 0%. When the valve core 211 is in the maximum open position, the opening degree of the valve port 2121 is 100%.

[0038] In some possible embodiments, refer to 1 to Figure 7 As shown, a method for manufacturing a valve device includes the following steps:

[0039] A valve seat 22 and a valve body component 30 are provided. The valve body component 30 has a mounting cavity 31. The valve seat 22 is assembled into the mounting cavity 31, and the valve body component 30 is in a limiting fit with the valve seat 22.

[0040] Valve body component 30 includes a first fixing part 33, valve seat 22 includes a connecting part 222, and a filling area is provided between the first fixing part 33 and the connecting part 222 to provide solder and fill the filling area with solder;

[0041] Laser welding is performed on the first fixing part 33 and the connecting part 222. After the laser melts the solder and part of the first fixing part 33, it is cooled and solidified to form the fixing part 32. The fixing part 32 has a fixing groove 321, and the connecting part 222 is at least partially located in the fixing groove 321. The connecting part 222 is welded and fixed to the groove wall of the fixing groove 321.

[0042] In this application, the valve body component 30 includes a first fixing part 33, and the valve seat 22 includes a connecting part 222. The first fixing part 33 and the connecting part 222 are laser welded. After the laser melts the solder and part of the first fixing part 33, it cools and solidifies to form the fixing part 32. The fixing part 32 has a fixing groove 321, and the connecting part 222 is at least partially located in the fixing groove 321. The connecting part 222 is welded and fixed to the groove wall of the fixing groove 321, thereby achieving a sealed and fixed connection between the valve body component 30 and the valve seat 22. Compared with the method of using a threaded connection and sealing element to seal the valve body component 30 and the valve seat 22, the connection stability is better, and the groove wall of the fixing groove 321 has a embedding effect on the connecting part 222, further enhancing the connection stability. Moreover, the welding fixation eliminates the need for a sealing element at the connection between the connecting part 222 and the fixing part 32, while still providing good sealing performance, thereby reducing material costs and facilitating industrial production.

[0043] When the first fixing part 33 and the connecting part 222 are laser welded, a laser welding device is provided. The laser welding device consists of a fiber laser with a wavelength of 1064-1080nm, a laser head with a maximum laser power of 4000W, a hollow rotating platform, a three-jaw chuck, an air blowing mechanism, a wire feeding mechanism, etc.

[0044] When the first fixing part 33 and the connecting part 222 are laser welded, the melting point of the solder is close to that of the aluminum alloy valve body component 30. After the laser melts the solder and part of the first fixing part 33, the two exhibit good compatibility. After melting, fusion, cooling, and solidification, an integrally formed fixing part 32 is formed. This results in a better laser welding effect between the first fixing part 33 and the connecting part 222, leading to better connection stability between the fixing part 32 and the connecting part 222, and better connection stability and sealing between the valve body component 30 and the valve seat 22. Optionally, brazing filler metal can be used as the solder. The melting point of the brazing filler metal is close to that of the aluminum alloy valve body component 30, and the brazing filler metal exhibits good compatibility after melting with part of the aluminum alloy valve body component 30.

[0045] Before laser welding the first fixing part 33 and the connecting part 222, remove oil, impurities, and oxide film from their surfaces, and then clean them with anhydrous ethanol and dry them. This improves the welding effect of laser welding between the first fixing part 33 and the connecting part 222.

[0046] Refer to 3 to Figure 7 As shown, before laser welding is performed on the first fixing part 33 and the connecting part 222, the connecting part 222 includes a first sidewall 2221 and a second sidewall 2222, and the first fixing part 33 includes a third sidewall 331. There is a gap between the first sidewall 2221 and the third sidewall 331, and there is a gap between the second sidewall 2222 and the third sidewall 331. The filling area is located in the receiving space formed by the first sidewall 2221, the second sidewall 2222, and the third sidewall 331. The second sidewall 2222 and the third sidewall 331 are arranged substantially parallel to each other.

[0047] The minimum distance between the second sidewall 2222 and the third sidewall 331 is defined as S, where the value of S ranges from 0.4mm to 1.2mm. A reasonable gap exists between the second sidewall 2222 and the third sidewall 331, allowing the molten solder and part of the first fixing part 33 to flow along and pass through the gap after laser melting of the solder and part of the first fixing part 33. However, due to surface tension, the molten solder and part of the first fixing part 33 will not drip down the gap to other parts, but will fuse and solidify with the connecting part 222 after cooling. If the value of S is too large, the molten solder and part of the first fixing part 33 will drip down the gap to other parts, adversely affecting the overall structure. If the value of S is too small, the molten solder and part of the first fixing part 33 can flow along the gap between the second side wall 2222 and the third side wall 331, but they fuse and cool before passing through the gap. After the molten solder and part of the first fixing part 33 cool and solidify, it is difficult to form an ideal fixing part 32. As a result, the connection stability and sealing of the fixing part 32 and the connecting part 222 are poor after laser welding.

[0048] The angle between the first sidewall 2221 and the axial direction of the valve device is defined as α, where the value of α ranges from 30° to 60°. The bevel design of the first sidewall 2221 creates a filling area between the first sidewall 2221, the second sidewall 2222, and the third sidewall 331, which facilitates the filling of solder.

[0049] The height of the first sidewall 2221 is defined as H1, where the value of H1 is in the range of 1mm ≤ H1 ≤ 5mm. The height of the second sidewall 2222 is defined as H2, where the value of H2 is in the range of 0mm ≤ H2 ≤ 1mm. The height of the third sidewall 331 is defined as H3, where the value of H3 is in the range of 1mm ≤ H3 ≤ 5mm.

[0050] The design of structural parameters such as the height H1 of the first sidewall 2221, the height H2 of the second sidewall 2222, the height H3 of the third sidewall 331, and the angle α between the first sidewall 2221 and the axial direction of the valve device is beneficial to improving the welding effect of laser welding of the first fixing part 33 and the connecting part 222, thereby improving the connection stability and sealing of the fixing part 32 and the connecting part 222, and improving the connection stability and sealing of the valve body component 30 and the valve seat 22.

[0051] Assembling the valve seat 22 into the mounting cavity 31, and the valve body component 30 and the valve seat 22 being fitted together, includes the following steps: The valve body component 30 includes a first inner wall 341 and a first stepped portion 342; the valve seat 22 includes a first outer wall 2231 and a second stepped portion 2232. The first inner wall 341 abuts against the first outer wall 2231, and the first inner wall 341 and the first outer wall 2231 are press-fitted together. Along the axial direction of the valve device, the first stepped portion 342 abuts against the second stepped portion 2232. The fitting between the first inner wall 341 and the first outer wall 2231 reduces the possibility of displacement during laser welding of the first fixing portion 33 and the connecting portion 222. The abutting fit between the first stepped portion 342 and the second stepped portion 2232 achieves accurate positioning of the valve body component 30 and the valve seat 22 before laser welding, thereby improving the welding effect of the laser welding between the connecting portion 222 and the first fixing portion 33, and further improving the connection stability and sealing performance of the valve body component 30 and the valve seat 22.

[0052] It should be understood that the integral structure in this application refers to a component manufactured from a single piece of material using processes such as stamping, extrusion, and machining, without the use of brazing, gluing, or other joining processes. The methods of fixing and installing together in this application include, but are not limited to, at least one of brazing, gluing, or bracket fixing. It should be understood that in this application, the "connection" between two components can be a direct connection or an indirect connection through other components.

[0053] The technical solutions described in this application should be understood by those skilled in the art. For example, directional descriptions such as "front," "back," "left," "right," "up," and "down" are only used to describe the relationship between objects and are not substantive limitations. "Multiple" means at least two or more.

[0054] Although this specification has described the present application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present application, and all technical solutions and improvements that do not depart from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. A valve device, characterized in that, It includes a valve component (20) and a valve body component (30). The valve component (20) includes a valve core assembly (21) and a valve seat (22). The valve seat (22) has an assembly cavity (221). The valve core assembly (21) is at least partially located in the assembly cavity (221). The valve core assembly (21) is connected to the valve seat (22). The valve body component (30) has a mounting cavity (31), the valve seat (22) is at least partially located in the mounting cavity (31), the valve body component (30) includes a fixing part (32), the valve seat (22) includes a connecting part (222), the fixing part (32) has a fixing groove (321), the connecting part (222) is at least partially located in the fixing groove (321), and the connecting part (222) is welded and fixed to the groove wall of the fixing groove (321).

2. The valve device as claimed in claim 1, characterized in that, The valve body component (30) includes a main body (34), the main body (34) and the fixing part (32) are integral structures, the fixing part (32) protrudes from the main body (34) toward the connecting part (222), and the cross section of the fixing part (32) is clamp-shaped; The valve seat (22) includes a body part (223), the body part (223) and the connecting part (222) are integral structures, and the connecting part (222) protrudes from the body part (223) toward the fixing part (32); The connecting part (222) and the fixing part (32) are fixed by laser welding.

3. The valve device as claimed in claim 2, characterized in that, The main body (34) includes a first inner sidewall (341), and the body part (223) includes a first outer sidewall (2231). The first inner sidewall (341) abuts against the first outer sidewall (2231), and the first inner sidewall (341) and the first outer sidewall (2231) are in an interference fit.

4. The valve device as claimed in claim 3, characterized in that, The main body (34) includes a first step (342), and the main body (223) includes a second step (2232). The first step (342) is annular, and the second step (2232) is annular. Along the axial direction of the valve device, the first step (342) and the second step (2232) abut against each other.

5. The valve device according to any one of claims 1 to 4, characterized in that, The melting point of the valve seat (22) is greater than that of the valve body component (30). The valve seat (22) is made of stainless steel, and the valve body component (30) is made of aluminum alloy. The valve seat (22) and the valve body component (30) are both integral structures.

6. The valve device according to any one of claims 1 to 4, characterized in that, The valve device includes a drive component (10) electrically connected and / or signal connected to the valve component (20), the drive component (10) including a housing (11) having a housing cavity (111), the valve component (20) being at least partially located in the housing cavity (111), and the valve component (30) being fixedly connected to the housing (11). The valve component (20) includes a rotor assembly (23), a lead screw (24), and a sleeve (25). The sleeve (25) is fitted around the outer periphery of the rotor assembly (23). The driving component (10) can drive the rotor assembly (23) to rotate relative to the sleeve (25). One end of the lead screw (24) is fixedly connected to the rotor assembly (23), and the other end of the lead screw (24) is connected to the valve core assembly (21).

7. The valve device as claimed in claim 6, characterized in that, The drive component (10) includes a stator assembly (12) and a circuit board (13). The stator assembly (12) and the circuit board (13) are both located in the housing cavity (111). The stator assembly (12) and the circuit board (13) are electrically connected and / or signal connected. The stator assembly (12) is sleeved on the outer periphery of the sleeve (25). The stator assembly (12) is fixedly connected or limitedly connected to the outer shell (11). The valve core assembly (21) includes a valve core component (211) and a valve core seat (212). The valve core seat (212) is fixedly connected to the valve seat (22), or is limited to the valve core component (22), or is an integral structure. The lead screw (24) is threadedly connected to the valve core component (211). The valve body component (30) is fixedly connected to the outer shell (11) by bolts. The valve core seat (212) has a valve port (2121), and the valve core (211) can adjust the opening degree of the valve port (2121).

8. A method for manufacturing a valve device, characterized in that, Includes the following steps: A valve seat (22) and a valve body component (30) are provided, the valve body component (30) having a mounting cavity (31), the valve seat (22) is assembled into the mounting cavity (31), and the valve body component (30) is in a limiting fit with the valve seat (22); The valve body component (30) includes a first fixing part (33), the valve seat (22) includes a connecting part (222), and a filler region is provided between the first fixing part (33) and the connecting part (222) to provide solder and fill the filler region with the solder; Laser welding is performed on the first fixing part (33) and the connecting part (222). After the welding material and part of the first fixing part (33) are melted by laser, the fixing part (32) is cooled and solidified to form the fixing part (32). The fixing part (32) has a fixing groove (321). The connecting part (222) is at least partially located in the fixing groove (321). The connecting part (222) is welded and fixed to the groove wall of the fixing groove (321).

9. The method for manufacturing the valve device as described in claim 8, characterized in that, Before laser welding is performed on the first fixing part (33) and the connecting part (222), the connecting part (222) includes a first sidewall (2221) and a second sidewall (2222), the first fixing part (33) includes a third sidewall (331), there is a gap between the first sidewall (2221) and the third sidewall (331), and there is a gap between the second sidewall (2222) and the third sidewall (331); The minimum distance between the second sidewall (2222) and the third sidewall (331) is defined as S, where the value of S is in the range of 0.4mm≤S≤1.2mm; The angle between the first sidewall (2221) and the axial direction of the valve device is defined as α, where the value of α is in the range of 30°≤α≤60°; The height of the first sidewall (2221) is defined as H1, where the value of H1 is in the range of 1mm≤H1≤5mm; The height of the second sidewall (2222) is defined as H2, where the value of H2 is in the range of 0mm≤H2≤1mm; The height of the third sidewall (331) is defined as H3, where the value of H3 is in the range of 1mm≤H3≤5mm.

10. The method for manufacturing the valve device as described in claim 9, characterized in that, Assembling the valve seat (22) into the mounting cavity (31), and limiting the valve body component (30) and the valve seat (22) in a limiting engagement includes the following steps: The valve body component (30) includes a first inner sidewall (341) and a first stepped portion (342), and the valve seat (22) includes a first outer sidewall (2231) and a second stepped portion (2232). The first inner sidewall (341) abuts against the first outer sidewall (2231), and the first inner sidewall (341) and the first outer sidewall (2231) are in an interference fit. Along the axial direction of the valve device, the first step portion (342) abuts against the second step portion (2232).

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