Electrically operated valve and method of assembling the same

Abstract

The utility model provides an electric valve and its assembling method, the electric valve includes valve parts, valve body parts and first transition piece, the metal material of first transition piece is different from the metal material of valve parts for welding position, the metal material of first transition piece is same with the metal material of valve body parts for welding position, the melting point temperature of at least one spare part inbuilt in valve parts is lower than brazing temperature, by first transition piece of metal material difference with valve parts for welding connecting seat or second transition piece is fixed through brazing, carries out valve parts assembly, then, first transition piece of metal material same with valve body parts is fixed through laser welding, like this, when the electric valve is applied to high pressure working medium system, through first transition piece respectively with valve parts and valve body parts welding fixed, improve the sealing performance between valve parts and valve body parts, also be favorable to reduce the risk of melting or deformation of the spare part in valve parts because of welding when the melting point is lower than brazing temperature.

Description

Technical Field

[0001] This application relates to an electric valve and an assembly method including the electric valve. Background Technology

[0002] In air conditioning or thermal management systems, electric valves are commonly used as throttling elements. These valves can throttle the working medium in either the forward or reverse direction, depending on the system's requirements. An electric valve consists of valve components and a valve body. These components are typically sealed with rubber seals to prevent leakage of the working medium. However, when the working medium is high-pressure, such as CO2 refrigerant (with an operating pressure ≥17MPa), the high pressure may penetrate the rubber seals, potentially leading to leakage from the electric valve.

[0003] Based on this, the inventors know that welding valve components to valve body components can improve the sealing performance of electric valves used with high-pressure media. However, in practical applications, the valve body components and the welding parts of the valve components are made of different materials, and different materials are generally connected by brazing, such as in tunnel welding. But direct brazing of valve body components to valve body components may cause melting or deformation of parts in the valve components whose melting point is lower than the brazing temperature. Therefore, how to improve the sealing performance between valve components and valve body components through welding when electric valves are used in high-pressure working media systems, while reducing the risk of melting or deformation of parts in the valve components, is a technical problem that needs to be improved. Summary of the Invention

[0004] The purpose of this application is to provide an electric valve and its assembly method, which is beneficial to improve the sealing performance between valve components and valve body components when the electric valve is applied to a high-pressure working medium system, while reducing the risk of melting or deformation of the valve components.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] An electric valve includes a valve component and a valve body component. The valve body component includes an opening forming a valve body cavity. A portion of the valve component is located within the valve body cavity. The valve body component and the valve component are made of different materials. The electric valve also includes a first transition member. The metal material of the first transition member is different from the metal material of the valve component used for welding. The metal material of the first transition member is the same as the metal material of the valve body component used for welding. The valve component has at least one component with a melting point temperature lower than the brazing temperature. The first transition member is located on the outer periphery of a portion of the valve component. At least a portion of the first transition member is located within the valve body cavity. The inner sidewall of the first transition member includes weld metal with the valve component. The inner sidewall of the first transition member is brazed to the valve component. The outer sidewall of the first transition member abuts against the opening. The outer sidewall of the first transition member is laser-welded to the opening.

[0007] An assembly method for an electric valve, the electric valve comprising a valve component, a valve body component, and a first transition member, the valve component comprising a second transition member and a connecting seat, the assembly method comprising the following steps:

[0008] The first transition piece is fitted onto the outer periphery of the second transition piece, and solder is filled between the first transition piece and the second transition piece. The first transition piece and the second transition piece are fixed by brazing.

[0009] The second transition piece, on which the first transition piece is welded, is fitted onto the outer periphery of the connecting seat, and the second transition piece is connected and fixed to the connecting seat;

[0010] To assemble the valve component, the valve component with the first transition piece welded on it is inserted into the valve body cavity of the valve body component, so that the first transition piece abuts against the valve body component, and the first transition piece and the valve body component are fixed by laser welding.

[0011] An assembly method for an electric valve, the electric valve comprising a valve component, a valve body component, and a first transition member, the valve component including a connecting seat, the assembly method comprising the following steps:

[0012] The first transition piece is sleeved on the outer periphery of the connecting seat, and solder is filled between the first transition piece and the connecting seat. The first transition piece and the connecting seat are fixed by brazing.

[0013] To assemble the valve component, the valve component with the first transition piece welded on it is inserted into the valve body cavity of the valve body component, so that the first transition piece abuts against the valve body component, and the first transition piece and the valve body component are fixed by laser welding.

[0014] This application provides an electric valve and its assembly method. The electric valve includes a valve component, a valve body component, and a first transition piece. The valve body component and the valve component are made of different materials. The metal material of the first transition piece is different from the metal material of the valve component used for welding. The metal material of the first transition piece is the same as the metal material of the valve body component used for welding. The valve component has at least one component whose melting point temperature is lower than the brazing temperature. By first fixing the first transition piece with different metal materials to the connecting seat or second transition piece of the valve component used for welding through brazing, and then assembling the valve component, the first transition piece with the same metal material is fixed to the valve body component by laser welding. In this way, when the electric valve is applied to a high-pressure working medium system, the sealing performance between the valve component and the valve body component is improved by welding the first transition piece to both the valve component and the valve body component. At the same time, it also helps to reduce the risk of melting or deformation of the components in the valve component whose melting point is lower than the brazing temperature due to welding. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the first implementation of the electric valve;

[0016] Figure 2 yes Figure 1 A cross-sectional structural diagram of the central valve component;

[0017] Figure 3 yes Figure 1 A cross-sectional structural diagram of the valve body component;

[0018] Figure 4 yes Figure 1 A magnified view of part A in the middle;

[0019] Figure 5 yes Figure 1 A schematic diagram of a cross-sectional structure of the second transition piece;

[0020] Figure 6 This is a cross-sectional structural schematic diagram of one embodiment of the second implementation of the electric valve;

[0021] Figure 7 yes Figure 6 A magnified view of part B in the middle section;

[0022] Figure 8 yes Figure 6 A schematic diagram of a cross-sectional structure of the connecting seat. Detailed Implementation

[0023] The present application will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] See Figure 1The electric valve can be used in air conditioning or thermal management systems, especially in systems using high-pressure working media (such as CO2) as refrigerant. The electric valve 100 includes a drive component 1, a valve component 2, and a valve body component 3. The valve body component 3 has a valve body cavity 30, a portion of which is located within the cavity 30. The valve component 2 is connected to the valve body component 3. The drive component 1 is located on the outer periphery of another portion of the valve component 2 and is connected to the valve body component 3. Furthermore, a sealing arrangement is provided between the drive component 1 and the valve body component 3. The electric valve 100 is electrically and / or signal-connected to the outside world through the drive component 1.

[0025] See Figure 1 and Figure 2 Valve component 2 includes a rotor assembly 21, a lead screw assembly 22, a valve core assembly 23, a connecting seat 24, a valve core seat 25, a sleeve 26, and a second transition member 27. The lead screw assembly 22 includes a lead screw 221. The rotor assembly 21 is fixedly connected to or limited by one end of the lead screw 221, and the other end of the lead screw 221 is threadedly connected to the valve core assembly 23. The connecting seat 24 is located on the outer periphery of a portion of the lead screw assembly 22 and a portion of the valve core assembly 23. The valve core seat 25 is located on the outer periphery of another portion of the valve core assembly 23, and the valve core seat 25 is connected to the connecting seat 24. The second transition member 27 is located on the outer periphery of the connecting seat 24 and is fixed to the connecting seat 24. Specifically, the fixing can be achieved by interference fit, welding or bonding. The sleeve 26 is sleeved on the outer periphery of the rotor assembly 21 and is sealed to the second transition member 27. In this embodiment, the sleeve 26 and the second transition member 27 are sealed by welding. The sleeve 26 is used to isolate the working medium located at the rotor assembly 21 from contact with the drive component 1, which helps to prevent the working medium located at the rotor assembly 21 from leaking out.

[0026] See Figure 1 and Figure 2The rotor assembly 21 includes a magnetic rotor 211 and a connector 212. The magnetic rotor 211 is formed by injection molding using the connector 212 as an injection-molded insert. The rotor assembly 21 is connected and fixed to the lead screw 221 or connected and limited via the connector 212. The valve core assembly 23 includes a valve core 231 and a nut 232. The valve core 231 is located on the outer periphery of a portion of the nut 232. The valve core 231 is connected and fixed to the nut 232 or connected and limited. In this embodiment, the valve core 231 is used as an injection-molded insert to form the nut 232. The nut 232 has a through threaded hole, and at least part of the sidewall forming the threaded hole is provided with an internal thread section. The end of the lead screw 221 that is threaded to the valve core assembly 23 is provided with an external thread section. The end of the lead screw 221 with the external thread section extends into the threaded hole and threadedly engages with the nut 232 to achieve a threaded connection between the lead screw 221 and the valve core assembly 23. The nut 232 includes a limiting part 233. Along the radial direction of the valve core 231, a portion of the limiting part 233 protrudes from the outer side wall of the valve core 231. The limiting part 233 is a non-rotating body. Correspondingly, the connecting seat 24 includes a mating part 241. The mating part 241 forms a mating cavity. The limiting part 233 is located in the mating cavity. The limiting part 233 and the mating part 241 are in a limiting fit to limit the circumferential rotation of the nut 232, thereby limiting the circumferential rotation of the valve core assembly 23. The limiting fit structure between the limiting part 233 and the mating part 241 can have various forms, as long as it can limit the circumferential rotation of the valve core assembly 23.

[0027] See Figure 1 and Figure 2The lead screw assembly 22 also includes a bearing 222 and a collar 223. The bearing 222 is located on the outer periphery of a portion of the lead screw 221, and the connecting seat 24 is located on the outer periphery of the bearing 222. The bearing 222 is connected and fixed or connected and limited to the connecting seat 24. In this embodiment, the bearing 222 and the connecting seat 24 have a transition fit. The connecting seat 24 includes a stepped portion 242 and a riveted portion 243. The bearing 222 abuts against the stepped portion 242, and the riveted portion 243 is bent. Along the axial direction of the bearing 222, the bearing 222 is pressed between the stepped portion 242 and the riveted portion 243. The collar 223 is located on the outer periphery of a portion of the lead screw 221, and the collar 223 is connected and fixed to the lead screw 221. Specifically, it can be fixed by interference fit, welding, or bonding. The lead screw 221 includes a flange portion 2211, which protrudes outward along the radial direction of the lead screw 221. Along the axial direction of the lead screw 221, the bearing 222 is located between the collar 223 and the flange portion 2211. The lead screw 221 is axially limited by abutting the bearing 222 through the flange portion 2211 or by abutting the bearing 222 through the collar 223. The valve core seat 25 has a valve port 251. When the rotor assembly 21 rotates circumferentially under the magnetic field excitation of the drive component 1, the rotor assembly 21 drives the lead screw 221 to rotate together. The rotating lead screw 221 is threadedly connected to the valve core assembly 23. Under the condition that the lead screw 221 is axially limited and the valve core assembly 23 is circumferentially limited, the valve core assembly 23 can perform linear reciprocating motion along the axial direction of the lead screw 221 under the drive of the lead screw 221. Specifically, the valve core assembly 23 can adjust the opening of the valve port 251 by moving closer to or further away from the valve port 251, thereby forming a throttling at the valve port 251.

[0028] See Figure 1 and Figure 2 The valve component 2 also includes a sealing assembly 29, which includes a sealing ring 291 and a first sealing element 292. The sealing ring 291 and the first sealing element 292 can be integrally formed by injection molding. The sealing ring 291 is located on the outer periphery of the valve core assembly 23, specifically on the outer periphery of the valve core 231. The sealing ring 291 is interference-fitted with the valve core 231, and the inner peripheral wall of the sealing ring 291 is in close contact with the outer peripheral wall of the valve core 231. The sealing ring 291 includes a recess, which is formed inward from the outer peripheral wall of the sealing ring 291 along the radial direction. The first sealing element 292 is located on the outer periphery of the sealing ring 291, and a portion of the first sealing element 292 is located in the cavity formed by the recess. Along the radial direction of the first sealing element 292, the first sealing element 292 abuts against the inner peripheral wall of the connecting seat 24 and the recess, respectively. The first sealing element 292 is pressed between the inner peripheral wall of the connecting seat 24 and the recess, and the first sealing element 292 is in a sealed and pressed state. The sealing component 29 is provided to seal between the valve core assembly 23 and the connecting seat 24, which helps to balance or tend to balance the forces on the valve core assembly 23 and make the valve core assembly 23 operate stably.

[0029] See Figures 1 to 3 The valve body component 3 includes an opening 31, which forms a valve body cavity 30. A portion of the valve component 2 is located within the valve body cavity 30. The valve component 2 is connected and fixed to the valve body component 3, or its connection is limited. To prevent the working medium located in the valve body cavity 30 from leaking out through the assembly gap between the valve component 2 and the valve body component 3, especially when the working medium is a high-pressure medium such as CO2 refrigerant, a sealing device is required between the valve component 2 and the valve body component 3. Specifically, the valve component 2 and the valve body component 3 can be sealed by welding to prevent leakage of the working medium, especially high-pressure working media. It should be noted that: Valve body component 3 is relatively large and has a thick wall. To reduce the overall weight and manufacturing cost of the electric valve 100 while still being able to withstand the pressure of the high-pressure medium, valve body component 3 can be made of lightweight metal materials, such as aluminum in this embodiment; while valve component 2 has a compact structure and a thinner wall. To enable it to withstand the pressure of the high-pressure medium, components such as the connecting seat 24, sleeve 26, and second transition piece 27 of valve component 2 need to be made of high-strength metal materials, such as stainless steel in this embodiment; due to the different materials used in stainless steel and aluminum... The melting points and strengths of stainless steel and aluminum components differ significantly. Generally, stainless steel and aluminum components are welded together by brazing, specifically through methods such as tunnel welding. However, since valve component 2 contains components with melting points lower than the brazing temperature, such as nut 232 and sealing component 29, direct brazing (e.g., tunnel welding) between valve component 2 and valve body component 3 may cause the melting or deformation of the components with melting points lower than the brazing temperature in valve component 2. In other words, valve component 2, which is made of stainless steel, and valve body component 3, which is made of aluminum, cannot be directly welded together for sealing.

[0030] Based on this, see Figures 1 to 4In this embodiment, the electric valve 100 further includes a first transition member 4, which is made of aluminum. A portion of the second transition member 27 is located in the valve body cavity 30, which is made of stainless steel. At least a portion of the first transition member 4 is located in the valve body cavity 30. The first transition member 4 is located on the outer periphery of a portion of the second transition member 27. The first transition member 4 and the second transition member 27 are fixed by brazing. Specifically, a weld metal 5 is included between the inner wall of the first transition member 4 and the outer wall of the second transition member 27. The inner wall of the first transition member 4 and the outer wall of the second transition member 27 are connected and fixed by the weld metal 5. The opening 31 includes a first sidewall 311. Since both the valve body component 3 and the first transition member 4 are made of aluminum, the first transition member 4 and the first sidewall 311 can be fixed by laser welding. This is because laser welding has advantages such as convenient operation, fast welding speed, and small welding deformation, and is often used for precision welding of micro and small parts. Specifically, the first sidewall 311 abuts against the outer sidewall of the first transition member 4, and the first sidewall 311 and the outer sidewall of the first transition member 4 are fixed by laser welding. The penetration depth of the laser welding between the first sidewall 311 and the outer sidewall of the first transition member 4 is defined as H1, where 1mm≤H1≤4mm. In this way, valve component 2 is fixed by brazing the outer wall of the second transition member 27 to the inner wall of the first transition member 4, and by laser welding the outer wall of the first transition member 4 to the first side wall 311, thereby achieving a welded seal between valve component 2 and valve body component 3. This helps prevent the working medium, especially the high-pressure working medium, from leaking out between valve component 2 and valve body component 3. At the same time, compared with the valve component 2 and valve body component 3 being directly fixed by brazing, it helps reduce the risk of melting or deformation of components built into valve component 2 whose melting point temperature is lower than the brazing temperature (such as nut component 232 and sealing component 29).

[0031] See Figures 1 to 5 In this embodiment, the connecting seat 24 further includes a second stepped surface 244, and a second transition member 27 is located on the outer periphery of a portion of the connecting seat 24. The second transition member 27 is interference-fitted with the connecting seat 24, and the lower end face of the second transition member 27 abuts against the second stepped surface 244. The end face of the second transition member 27 away from the sleeve 26 along the axial direction of the second transition member 27 is defined as the lower end face. Both the second transition piece 27 and the sleeve 26 are made of stainless steel. The sleeve 26 and the second transition piece 27 are sealed by laser welding. Specifically, the second transition piece 27 includes a first stepped surface 271. Along the axial direction of the second transition piece 27, the first stepped surface 271 is positioned closer to the sleeve 26 than the lower end face of the second transition piece 27. The free end face of the sleeve 26 abuts against the first stepped surface 271. The free end face of the sleeve 26 and the first stepped surface 271 are fixed by laser welding. The penetration depth of the laser welding between the free end face of the sleeve 26 and the first stepped surface 271 is defined as H2, where 0.4mm ≤ H2 ≤ 1mm.

[0032] See Figures 1 to 3In this embodiment, since the second transition member 27 is fixed with the connecting seat 24 by an interference fit, in order to reduce the internal leakage between the second transition member 27 and the connecting seat 24, or in other words, to reduce the internal leakage of the working medium located at the rotor assembly 21 into the valve body cavity 30, the connecting seat 24 also includes a groove portion 245. Along the radial direction of the connecting seat 24, the groove portion 245 is recessed inward from the side wall surface of the connecting seat 24. The opening portion 31 also includes a second side wall 312. Along the axial direction of the valve body cavity 30, the first side wall 311 is disposed closer to the opening of the valve body cavity 30 than the second side wall 312. The valve component 2 also includes a second seal member 28. A portion of the second seal member 28 is located in the groove cavity formed by the groove portion 245. Along the radial direction of the second seal member 28, the second seal member 28 abuts against the second side wall 312 and the groove portion 245 respectively. The second seal member 28 is pressed between the second side wall 312 and the groove portion 245, and the second seal member 28 is in a sealed and pressed state. Furthermore, to reduce internal leakage, a sealing device can be installed between the valve core seat 25 and the opening 31.

[0033] See Figures 6 to 8 This is a second embodiment of the electric valve. The difference between the second and first embodiments is that in the second embodiment, the second transition member and the connecting seat are integrally formed. The first transition member 4 is located on a portion of the outer periphery of the connecting seat 24'. The first transition member 4 and the connecting seat 24' are fixed by brazing. Specifically, a weld metal 5 is included between the inner sidewall of the first transition member 4 and the outer sidewall of the connecting seat 24'. The inner sidewall of the first transition member 4 and the outer sidewall of the connecting seat 24' are connected and fixed by the weld metal 5. At least a portion of the first transition member 4 is located in the valve body cavity 30. The outer sidewall of the first transition member 4 abuts against the first sidewall 311 of the valve body component 3. The outer sidewall of the first transition member 4 and the first sidewall 311 are fixed by laser welding. The penetration depth of the laser welding between the first sidewall 311 and the outer sidewall of the first transition member 4 is defined as H1, and the penetration depth H1 can be 1mm to 4mm. When the second transition piece and the connecting seat are integrally formed, the outer wall of the connecting seat 24' which is brazed and fixed to the first transition piece 4 is thicker. Specifically, the outer wall thickness of the brazed part of the connecting seat 24' and the first transition piece 4 can be defined as W, where W ≥ 1.2 mm.

[0034] In addition, in this embodiment, the connecting seat 24' includes a first stepped surface 246', and the sleeve 26 is sleeved on the outer periphery of the rotor assembly 21. The free end face of the sleeve 26 abuts against the first stepped surface 246', and the free end face of the sleeve 26 and the first stepped surface 246' are fixed by laser welding. The weld penetration depth of the laser welding between the free end face of the sleeve 26 and the first stepped surface 246' is defined as H3, and the weld penetration depth H3 can be 0.4mm to 1mm. The other parts of the electric valve 100' are not significantly the same as in the first embodiment, and will not be described in detail here. It should be noted that in the second embodiment, compared with the first embodiment, the second transition member and the connecting seat are integrally formed. Thus, in the second embodiment, there is no interference fit leakage problem between the second transition member and the connecting seat. As another embodiment, in the second embodiment, the connecting seat 24' may not include the groove 245, and the valve component 2' may not include the second sealing member 28.

[0035] See Figures 1 to 5 The assembly method of the electric valve 100 according to the first embodiment will be further described. The assembly method of the electric valve 100 includes the following steps:

[0036] The first transition piece 4 is fitted onto the outer periphery of the second transition piece 27, and solder 5 is filled between the first transition piece 4 and the second transition piece 27. The first transition piece 4 and the second transition piece 27 are then fixed by brazing.

[0037] The second transition piece 27, which is welded with the first transition piece 4, is sleeved on the outer periphery of the connecting seat 24, and the second transition piece 27 is connected and fixed to the connecting seat 24. Specifically, the second transition piece 27 and the connecting seat 24 can be interference fit.

[0038] The valve component 2 is assembled by fixing the sleeve 26 and the second transition piece 27 by laser welding. Specifically, the valve component 2 is assembled by fitting the sleeve 26 onto the outer periphery of the rotor assembly 21 and abutting the free end face of the sleeve 26 against the first step surface 271 of the second transition piece 27 by laser welding.

[0039] The valve component 2 with the first transition piece 4 welded on it is assembled with the valve body component 3. The first transition piece 4 and the valve body component 3 are fixed by laser welding. Specifically, the valve component 2 with the first transition piece 4 welded on it is inserted into the valve body cavity 30 of the valve body component 3. The first side wall 311 of the valve body component 3 abuts against the outer side wall of the first transition piece 4. The first side wall 311 and the outer side wall of the first transition piece 4 are fixed by laser welding.

[0040] The drive component 1 is fitted onto the outer periphery of the sleeve 26, and the drive component 1 is connected and fixed or connected and limited to the valve body component 3 to complete the assembly of the electric valve 100.

[0041] See Figures 6 to 8 The assembly method of the electric valve 100' in the second embodiment will be further described. The assembly method of the electric valve 100' includes the following steps:

[0042] The first transition piece 4 is fitted onto the outer periphery of the connecting seat 24', and the space between the first transition piece 4 and the connecting seat 24' is filled with solder 5. The first transition piece 4 and the connecting seat 24' are fixed by brazing.

[0043] The valve component 2' is assembled by fixing the sleeve 26 and the connecting seat 24' by laser welding. Specifically, the valve component 2' is assembled by fitting the sleeve 26 onto the outer periphery of the rotor assembly 21 and abutting the free end face of the sleeve 26 against the first stepped surface 246' of the connecting seat 24'. The free end face of the sleeve 26 and the first stepped surface 246' are fixed by laser welding.

[0044] The valve component 2' with the first transition piece 4 welded on is assembled with the valve body component 3. The first transition piece 4 and the valve body component 3 are fixed by laser welding. Specifically, the valve component 2' with the first transition piece 4 welded on is inserted into the valve body cavity 30 of the valve body component 3. The first side wall 311 of the valve body component 3 abuts against the outer side wall of the first transition piece 4. The first side wall 311 and the outer side wall of the first transition piece 4 are fixed by laser welding.

[0045] The drive component 1 is fitted onto the outer periphery of the sleeve 26, and the drive component 1 is connected and fixed or connected to the valve body component 3 to complete the assembly of the electric valve 100'.

[0046] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. For example, the directional definitions such as "front", "back", "left", "right", "up", and "down" are used. Although this specification has described this 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 this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. An electric valve, comprising a valve component and a valve body component, the valve body component including an opening forming a valve body cavity, a portion of the valve component being located within the valve body cavity, the valve body component and the valve component being made of different materials, characterized in that: The electric valve further includes a first transition member, the metal material of which is different from the metal material of the valve component used for welding, and the metal material of which is the same as the metal material of the valve body component used for welding. The valve component has at least one component whose melting point temperature is lower than the brazing temperature. The first transition member is located on the outer periphery of a portion of the valve component, and at least a portion of the first transition member is located in the valve body cavity. A weld metal is included between the inner wall of the first transition member and the valve component. The valve component includes a connecting seat, and / or, the valve component includes a second transition member, the inner wall of the first transition member being brazed to the connecting seat, or the inner wall of the first transition member being brazed to the second transition member. The valve component includes a sleeve, the sleeve being welded to the connecting seat or the second transition member. The outer wall of the first transition member abuts against the opening, and the outer wall of the first transition member is laser-welded to the opening.

2. The electric valve according to claim 1, characterized in that: The valve component includes a connecting seat and a second transition member. The second transition member is located on the outer periphery of a portion of the connecting seat and is fixedly connected to the connecting seat. The first transition member is located on the outer periphery of a portion of the second transition member. The metal material of the first transition member is different from that of the second transition member. There is a weld metal between the inner sidewall of the first transition member and the second transition member. The inner sidewall of the first transition member is brazed and fixed to the second transition member. The opening includes a first sidewall. The outer sidewall of the first transition member abuts against the first sidewall. The outer sidewall of the first transition member is laser-welded and fixed to the first sidewall.

3. The electric valve according to claim 2, characterized in that: The metal material of the sleeve is the same as that of the second transition member. The second transition member also includes a first stepped surface. The free end face of the sleeve abuts against the first stepped surface. The free end face of the sleeve is laser welded to the first stepped surface. The penetration depth of the laser welding between the outer sidewall of the first transition piece and the first sidewall is defined as H1, where 1mm ≤ H1 ≤ 4mm. The penetration depth of the laser welding between the free end face of the sleeve and the first step surface is defined as H2, where 0.4mm ≤ H2 ≤ 1mm.

4. The electric valve according to claim 1, characterized in that: The valve component includes a connecting seat, a first transition member located on the outer periphery of a portion of the connecting seat, the metal material of the first transition member being different from the metal material of the connecting seat, a weld metal being included between the inner sidewall of the first transition member and the connecting seat, and the inner sidewall of the first transition member being brazed to the connecting seat; the opening includes a first sidewall, the outer sidewall of the first transition member abutting against the first sidewall, and the outer sidewall of the first transition member being laser-welded to the first sidewall; The wall thickness of the brazed portion between the connector and the first transition piece is defined as W, where W ≥ 1.2 mm.

5. The electric valve according to claim 4, characterized in that: The metal material of the sleeve is the same as that of the connecting seat. The connecting seat also includes a first stepped surface. The free end face of the sleeve abuts against the first stepped surface. The free end face of the sleeve is laser welded to the first stepped surface. The penetration depth of the laser welding between the outer sidewall of the first transition piece and the first sidewall is defined as H1, where 1mm ≤ H1 ≤ 4mm. The penetration depth of the laser welding between the free end face of the sleeve and the first stepped surface is defined as H3, where 0.4mm ≤ H3 ≤ 1mm.

6. The electric valve according to any one of claims 2-5, characterized in that: The connecting seat includes a recessed portion formed inward from the side wall of the connecting seat along the radial direction of the connecting seat; the opening includes a second side wall along the axial direction of the valve body cavity, with the first side wall being closer to the opening of the valve body cavity than the second side wall; the valve component further includes a second seal, a portion of which is located in the groove formed by the recessed portion, and along the radial direction of the second seal, the second seal abuts against the second side wall and the recessed portion respectively, and the second seal is pressed between the second side wall and the recessed portion.

7. A method for assembling an electric valve, the electric valve comprising a valve component, a valve body component, and a first transition member, the valve component comprising a second transition member and a connecting seat, the assembly method comprising the following steps: The first transition piece is fitted onto the outer periphery of the second transition piece, and solder is filled between the first transition piece and the second transition piece. The first transition piece and the second transition piece are fixed by brazing. The second transition piece, on which the first transition piece is welded, is fitted onto the outer periphery of the connecting seat, and the second transition piece is connected and fixed to the connecting seat; To assemble the valve component, the valve component with the first transition piece welded on it is inserted into the valve body cavity of the valve body component, so that the first transition piece abuts against the valve body component, and the first transition piece and the valve body component are fixed by laser welding.

8. The assembly method according to claim 7, characterized in that: The electric valve further includes a drive component, and the valve component further includes a sleeve. The assembly method further includes interfering with the second transition member and the connecting seat, fixing the sleeve and the second transition member by laser welding, sleeve the drive component on the outer periphery of the sleeve, and connecting and fixing or limiting the drive component to the valve body component.

9. A method for assembling an electric valve, the electric valve comprising a valve component, a valve body component, and a first transition member, the valve component comprising a connecting seat, the assembly method comprising the following steps: The first transition piece is sleeved on the outer periphery of the connecting seat, and solder is filled between the first transition piece and the connecting seat. The first transition piece and the connecting seat are fixed by brazing. To assemble the valve component, the valve component with the first transition piece welded on it is inserted into the valve body cavity of the valve body component, so that the first transition piece abuts against the valve body component, and the first transition piece and the valve body component are fixed by laser welding.

10. The assembly method according to claim 9, characterized in that: The electric valve further includes a drive component, and the valve component further includes a sleeve. The assembly method further includes fixing the sleeve to the connecting seat by laser welding, fitting the drive component onto the outer periphery of the sleeve, and connecting and fixing or limiting the drive component to the valve body component.

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