An electrically operated valve

Abstract

The utility model discloses an electric valve, including valve seat part, valve seat part includes valve seat and connecting seat, the valve seat has the valve port, the lower end of connecting seat is fixed with valve seat through welding, and the lower end of connecting seat is between valve seat and has at least two welding solidification, and adjacent welding solidification is discontinuous, and valve seat has at least two flow through holes, and flow through hole is shaped in the circumference of valve seat and is through the lateral wall of valve seat, and welding solidification is located between flow through hole and connecting seat, and at least part flow through hole is located between welding solidification and valve port, and it is set up to reduce the deformation of valve port due to welding stress, and improve the matching precision of valve port.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and more specifically to an electric valve. Background Technology

[0002] Electric valves are used to regulate flow. With increasing demands for flow control accuracy, electric valves are increasingly being used in automotive air conditioning systems, heat pump systems, and battery cooling systems. An electric valve includes a valve seat assembly, which comprises a valve seat portion and a connecting seat. The valve seat portion has a valve port. The valve seat portion and the connecting seat are fixed together by welding. During cooling, the molten portions of the valve seat portion and the connecting seat will experience opposite contractions, potentially causing deformation of the valve port due to welding stress. This can affect the fitting accuracy of the valve port and may lead to leakage that does not meet requirements. Summary of the Invention

[0003] The purpose of this application is to provide an electric valve that helps reduce the deformation of the valve port caused by welding stress and improves the fitting accuracy of the valve port.

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

[0005] An electric valve includes a valve component comprising a valve core component and a valve seat component. The valve seat component includes a valve seat portion and a connecting seat. The valve seat portion has a valve port. The valve core component is movable relative to the valve port. The connecting seat has a through hole portion. The valve seat portion is inserted into the through hole portion. The lower end of the connecting seat is fixed to the valve seat portion by welding. At least two weld solidification portions are present between the lower end of the connecting seat and the valve seat portion. Adjacent weld solidification portions are discontinuous. The valve seat portion has at least two flow holes. The flow holes are formed circumferentially in the valve seat portion and penetrate the sidewall of the valve seat portion. The weld solidification portions are located between the flow holes and the connecting seat. At least a portion of the flow holes are located between the weld solidification portions and the valve port.

[0006] The electric valve includes a valve seat component, which comprises a valve seat portion and a connecting seat. The valve seat portion has a valve port. The lower end of the connecting seat is fixed to the valve seat portion by welding. There are at least two weld solidification portions between the lower end of the connecting seat and the valve seat portion. Adjacent weld solidification portions are discontinuous. The valve seat portion has at least two flow holes, which are formed circumferentially in the valve seat portion and penetrate the side wall of the valve seat portion. The weld solidification portions are located between the flow holes and the connecting seat, and at least part of the flow holes are located between the weld solidification portions and the valve port. This arrangement helps to reduce the deformation of the valve port caused by welding stress, improve the fitting accuracy of the valve port, improve the sealing performance, and reduce leakage. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of the first embodiment of the electric valve provided by the present invention;

[0008] Figure 2 yes Figure 1 A cross-sectional structural diagram of a medium-sized electric valve;

[0009] Figure 3 yes Figure 2 Enlarged structural diagram of section A in the middle;

[0010] Figure 4 yes Figure 2 A structural schematic diagram of the central valve component from one perspective;

[0011] Figure 5 yes Figure 4 Enlarged structural diagram of section B in the middle;

[0012] Figure 6 yes Figure 4 A cross-sectional view of the central valve component along the BB plane;

[0013] Figure 7 yes Figure 4 Schematic diagram of the separate structure of the valve seat and the connecting seat;

[0014] Figure 8 yes Figure 4 A bottom view of the central valve component;

[0015] Figure 9 This is a three-dimensional structural diagram of the valve component in the second embodiment of the electric valve;

[0016] Figure 10 yes Figure 9 A bottom view of the central valve component;

[0017] Figure 11 This is a three-dimensional structural diagram of the valve component in the third embodiment of the electric valve;

[0018] Figure 12 yes Figure 11 A bottom view of the central valve component;

[0019] Figure 13 This is a three-dimensional structural diagram of the valve component in the fourth embodiment of the electric valve;

[0020] Figure 14 yes Figure 13 A bottom view of the central valve component;

[0021] Figure 15 yes Figure 13 A three-dimensional structural diagram of a variant of the central valve component;

[0022] Figure 16This is a schematic diagram showing the partial valve seat portion unfolding along a plane when the welded solidified part is located above the flow hole and is discontinuous;

[0023] Figure 17 This is a schematic diagram showing the partial valve seat portion unfolding along a plane when the welded solidified section is a complete ring;

[0024] Figure 18 This is a schematic diagram showing the partial valve seat unfolding along a plane when the welded solidification part is discontinuous but not located above the flow hole;

[0025] Figure 19 This is a comparative diagram showing the valve orifice shape when the weld solidification part is located above the flow hole and is discontinuous, and the valve orifice shape when the weld solidification part is a complete circle or when the weld solidification part is discontinuous but not located above the flow hole.

[0026] Figure 20 This is a schematic diagram of the valve seat component placed in the fixture. Detailed Implementation

[0027] The technical features and advantages of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Combination Figures 1-8In a first embodiment of the electric valve 100 of this invention, the electric valve 100 includes a valve body 1, a coil assembly 2, and a valve component 3. The valve component 3 is assembled with the valve body 1, and the coil assembly 2 is fixedly connected to the valve body 1. The coil assembly 2 includes a stator assembly 21, an injection-molded body 22, and a connector 23. Part of the injection-molded body 22 covers the stator assembly 21, and the stator assembly 21 and the pins (not shown in the figure) inside the connector 23 are connected. The valve component 3 includes a valve seat component 31, a magnetic rotor 32, a rotor shaft 33, a nut assembly 34, a sleeve 35, and a valve core component 36. The lower end of the sleeve 35 is connected to the valve seat component 31 by welding, and part of the sleeve 35 is located between the magnetic rotor 32 and the stator assembly 21. The valve seat component 31 includes a valve seat portion 311 and a connecting seat 312. In this embodiment, the valve seat portion 311 and the connecting seat 312 are separately formed and then fixedly connected. Along the height direction of the electric valve 100, the lower end of the sleeve 35 is fixedly connected to the connecting seat 312, and the lower end of the connecting seat 312 is fixedly connected to the valve seat portion 311 by laser welding. The valve seat portion 311 includes a valve seat 3111, and the valve seat 3111 has a valve port 3112. A predetermined current is applied to the stator assembly 21 to generate an excitation magnetic field, allowing the magnetic rotor 32 to rotate within this field. The magnetic rotor drives the rotor shaft 33 to rotate, and the rotor shaft 33 is threadedly engaged with the nut assembly 34, causing the valve core component 36 to move up and down relative to the valve port 3112. The valve core component 36 can seal the valve port 3112, regulate the flow rate at the valve port 3112, or allow a small flow rate when the valve core component 36 is at its lowest position. In this embodiment, the valve port 3112 is sealed when the valve core component 36 is at its lowest position. The axis of the rotor shaft 33 is defined as L, and the axis L passes through the center of the valve port 3112.

[0029] Combination Figures 1-8In this embodiment, the valve body 1 includes a first channel 11, a second channel 12, and a valve body cavity 13. A portion of the valve seat component 31 is located in the valve body cavity 13. The first channel 11 serves as an inlet channel, and the second channel 12 serves as an outlet channel. Of course, in other embodiments, the first channel 11 can also serve as an outlet channel, and the second channel 12 as an inlet channel. At least a portion of the valve seat portion 311 has a generally cylindrical sidewall. Along the axis L of the rotor shaft 33, the valve seat 3111 is located at a relatively lower position in the valve seat portion 311. The valve seat portion 311 includes a valve seat portion inner cavity 3113 and a flow hole 3114. The first channel 11 is directly connected to the valve body cavity 13, and the valve body cavity 13 is connected to the valve seat portion inner cavity 3113 through the flow hole 3114. The second channel 12 can flow through the valve port 3112 and the valve seat portion inner cavity 3113. The electric valve 100 also includes a first sealing element 41 and a second sealing element 42. The connecting seat 312 is provided with a first sealing groove 43, and the valve seat portion 311 is provided with a second sealing groove 44. The first sealing element 41 is housed in the first sealing groove 43, and the second sealing element 42 is housed in the second sealing groove 44. This arrangement facilitates the assembly of the electric valve 100. The first sealing element 41 is located between the connecting seat 312 and the valve body 1 to prevent the working medium from leaking to the outside through the gap between the connecting seat 312 and the valve body 1. The second sealing element 42 is located between the valve seat portion 311 and the valve body 1 to prevent the working medium from flowing through the gap between the valve seat portion 311 and the valve body 1. In this embodiment, the valve body 1 is a separate valve block, and the first channel 11 and the second channel 12 are formed in the valve body 1. In other embodiments, the valve body may also be part of a heat exchanger assembly or other components. In other embodiments, pipes may also be provided as inlet and outlet channels.

[0030] Combination Figures 1-8In this embodiment, the valve seat portion 311 and the connecting seat 312 are fixed by an interference fit and then fixedly connected by laser welding. The lower end of the connecting seat 312 is fixed to the valve seat portion 311 by laser welding. There are at least two weld solidification portions 5 between the lower end of the connecting seat 312 and the valve seat portion 311. Adjacent weld solidification portions 5 are not connected. The valve seat portion 311 has at least two flow holes 3114. The flow holes 3114 are formed in the circumference of the valve seat portion 311 and penetrate the side wall of the valve seat portion 311. The weld solidification portions 5 are located between the flow holes 3114 and the connecting seat 312. At least a portion of the flow holes 3114 is located between the weld solidification portions 5 and the valve port 3112. The valve seat portion 311 is generally cylindrical. Along the circumferential direction of the valve seat portion 311, more than 80% of the arc length of each weld solidification portion 5 is located within the coverage area of ​​the maximum arc length along the circumferential direction of the outer edge of the corresponding flow hole 3114. The number of flow holes 3114 is greater than or equal to two, and the number of welded solidified parts 5 is less than or equal to the number of flow holes 3114. The welded solidified parts 3114 are in the form of weld seams or weld points. Along the axial projection of the valve seat 311, more than 80% of the arc length of each welded solidified part 5 is located within the coverage area of ​​the maximum circumferential arc length of the outer edge of the corresponding flow hole 3114. Each welded solidified part 5 is spaced apart from the valve port 3112 by one flow hole 3114. In this embodiment, the number of welded solidified parts is four. An interference fit is used to fix them, which facilitates the positioning of the valve seat 311 and the connecting seat 312. Of course, other embodiments can also use a clearance fit, and a positioning fixture can be set to limit the positioning of the valve seat and the connecting seat. The valve seat portion 311 is generally cylindrical and includes a valve core guide portion 3115, a nut guide portion 3116, a mounting section 3117, and a flow hole forming section 3118. The valve core guide section 3115 is located on the inner peripheral wall of the valve seat portion 311, providing guidance for the valve core component 36 and improving coaxiality. The nut guide section 3116 provides guidance for the nut assembly, which also improves the coaxiality between the nut and the valve core. The connecting seat 312 has a through hole portion 3121, into which the valve seat portion 311 is inserted. The mounting section 3117 is fixed to the through hole portion 3121 of the connecting seat 312 by an interference fit, limiting the relative radial position of the valve seat portion 311 and the connecting seat 312. A flow hole 3114 is formed circumferentially on the flow hole forming section 3118. The outer diameter of the flow hole forming section 3118 is larger than the outer diameter of the mounting section 3117. The lower end of the connecting seat 312 abuts against the upper end of the connecting hole forming section 3118, restricting the relative axial position of the valve seat 311 and the connecting seat 312. The welded solidification part 5 connects the lower end of the connecting seat 312 and the upper end of the flow hole forming section 3118. In this embodiment, the welded solidification part 5 is in the form of a weld. In this embodiment, the flow hole forming section 3118 has four flow holes 3114. The four flow holes 3114 are arranged circumferentially on the flow hole forming section 3118 and spaced at a predetermined distance. The flow holes 3114 are approximately circular or elliptical.The flow holes 3114 include a first flow hole, a second flow hole, a third flow hole, and a fourth flow hole, and are uniformly distributed around the axis L of the rotor shaft 33. A laser generates a laser beam that melts the lower end face of the connecting seat 312 and the upper end of the flow hole forming section 3118 to form a weld solidification portion 5. The weld solidification portion 5 includes a first weld solidification portion, a second weld solidification portion, a third weld solidification portion, and a fourth weld solidification portion. These four weld solidification portions are discontinuous, or spaced at intervals. The first weld solidification portion is located above the first flow hole, the second weld solidification portion is located above the second flow hole, the third weld solidification portion is located above the third flow hole, and the fourth weld solidification portion is located above the fourth flow hole. In this application, "above" means that at least a large portion of the weld solidification portion 5 is located within the range of two points corresponding to the maximum circumferential distance along the outer edge of the flow hole 3114. "Large portion" means more than 80%, for example, see [reference needed]. Figure 5In one embodiment, the two points corresponding to the maximum circumferential distance of the outer edge of the flow hole 3114 are the first point A1 and the second point A2, respectively. The leftmost end of the weld solidification part 5 above the flow hole 3114 does not exceed point A1, and the rightmost end does not exceed point A2. In other words, the weld solidification part 5 is located between the flow hole 3114 and the connecting seat 312. Along the axis L of the rotor shaft 33, more than 80% of the arc length of the weld solidification part 5 is within the coverage area of ​​the maximum arc length of the outer edge of the flow hole 3114 in the circumferential direction. In a first embodiment of the electric valve 100, the positional relationship between the first weld solidification part 51 and the first flow hole 3114a is used as an example for explanation. The line connecting the midpoint of the first weld solidification part 51 and the midpoint of the first flow hole 3114a is coplanar with the axis of the rotor shaft. Taking a point on the axis L of the rotor shaft 33 as the center, the angle of the weld solidification part 51 around the axis L of the rotor shaft 33 is the first angle, that is, the included angle between the two ends of the first weld solidification part 51 is the first angle. Taking a point on the axis L of the rotor shaft 33 as the center, the flow hole 3114a around the rotor shaft 33... The maximum angle of axis L is the second angle, that is, the included angle between the outer edges of the first flow hole 3114a is the second angle. The first angle is smaller than the second angle. Here, "certain range" refers to ensuring welding strength. For example, the maximum angle of the first flow hole around axis L is 40 degrees, and the angle of the first weld solidification part 51 around axis L can be 30 degrees. The setting of the other three weld solidification parts is the same as that of the first weld solidification part; or, along the axis L of rotor shaft 33, the arc length of the weld solidification part 5 is smaller than the maximum circumferential arc length of the outer edge of the flow hole 3114 within a certain range. With this setting, the weld solidification part 5 is formed above the flow hole 3114 by laser melting connection seat 312 and valve seat part 311. During the cooling process of the weld solidification part, the shrinkage stress of the weld solidification part will not directly act on the valve port due to the obstruction of the flow hole 3114, which can reduce the change in the roundness of the valve port 3112. This improves the pass rate of the fitting accuracy after the valve core part 36 abuts against the valve port 3112, improves the sealing performance, and reduces leakage. See also Figures 16-19 , Figure 16 This is a partial view of the valve seat portion 311 along the plane when the welded solidified portion 5 is located above the flow hole and is discontinuous. When the welded solidified portion 5 is located above the flow hole, the lower end of the valve seat portion has basically no axial deformation along the axis L, and the valve seat also has basically no axial deformation. Figure 17 This is a partial view of the valve seat portion 311 along the plane when the welded solidified portion 5a is a complete circle. When the welded solidified portion 5a is a complete circle, along the axis L, the lower end of the valve seat portion undergoes axial deformation at a position that does not correspond to the flow hole, and the valve seat also undergoes axial deformation. Figure 18This is a partial view of the valve seat portion 311 along the plane when the welded solidified portion 5b is discontinuous but not located above the flow hole. When the welded solidified portion 5b is not located above the flow hole, the lower end of the valve seat portion undergoes axial deformation along the axis L at a position not corresponding to the flow hole, and the valve seat also undergoes axial deformation. Figure 19 Y1 is a schematic diagram of the valve port when the solidified weld portion is located above the flow hole and is discontinuous. The valve port is approximately circular with no radial deformation. Y2 is a schematic diagram of the valve port when the solidified weld portion is a complete circle or discontinuous but not located above the flow hole. The valve port undergoes radial deformation and is no longer circular. Since the position of the solidified weld portion 5 corresponds to the position of the flow hole 3114, the flow hole acts as a barrier to the welding stress. The flow hole 3114 can prevent the welding stress of the solidified weld portion from being transmitted to the lower part of the valve seat, preventing the valve seat from deforming in the axial direction. At the same time, it prevents the roundness of the valve port 3112 from changing or the center of the valve port 3112 from shifting, thereby improving the fitting accuracy between the valve core component 36 and the valve port 3112, improving the sealing performance, and reducing leakage. In this embodiment, after the flow hole forming section 3118 of the valve seat portion 311 is unfolded along the plane, the flow hole 3114 is approximately circular. Of course, the width of the flow hole 3114 can be wider along the circumference of the flow hole forming section 3118 to better facilitate flow balance and prevent valve seat deformation. At the same time, the welding heat generated by laser welding can be reduced by 360 degrees relative to the weld solidification part around the axis L, and the welding heat transferred to the valve port can be reduced, thus reducing valve port deformation.

[0031] In the first variant of the first embodiment of the electric valve, when the line connecting the midpoint of the first weld solidification part 51 and the midpoint of the first flow hole 3114a is coplanar with the axis L of the rotor shaft, the first angle is equal to the second angle, and the arrangement of the other three weld solidification parts is the same as that of the first weld solidification part 51.

[0032] In a second variation of the first embodiment of the electric valve, when the line connecting the midpoint of the first weld solidification portion 51 and the midpoint of the first flow hole 3114a is coplanar with the axis L of the rotor shaft, the first angle is greater than the second angle within a certain range. Here, a certain range means that 80% of the first angle is less than or equal to the second angle. For example, when the second angle is 30 degrees, the first angle is less than or equal to 37.5 degrees. The arrangement of the other three weld solidification portions is the same as that of the first weld solidification portion; or, in other words, at least 80% of the first angle overlaps with the second angle.

[0033] In the third variation of the first embodiment of the electric valve, when the line connecting the midpoint of the first weld solidification part 51 and the midpoint of the first flow hole 3114a is not in the same plane as the axis L of the rotor shaft, the first angle is equal to the second angle, and the arrangement of the other three weld solidification parts is the same as that of the first weld solidification part.

[0034] In the fourth variation of the first implementation of the electric valve, when the line connecting the midpoint of the first weld solidification part 51 and the midpoint of the first flow hole 3114a is not in the same plane as the axis L of the rotor shaft, the first angle is less than the second angle within a certain range. Here, the certain range refers to the range that can ensure the welding strength. For example, the maximum angle of the first flow hole around the axis L is 40 degrees, and the angle of the first weld solidification part 51 around the axis L can be 30 degrees. The arrangement of the other three weld solidification parts is the same as that of the first weld solidification part.

[0035] In the fifth variation of the first embodiment of the electric valve, when the line connecting the midpoint of the first weld solidification part 51 and the midpoint of the first flow hole 3114a is not in the same plane as the axis L of the rotor shaft, the first angle is greater than the second angle within a certain range. Here, a certain range means that 80% of the first angle is less than or equal to the second angle. For example, when the second angle is 30 degrees, the first angle is less than or equal to 37.5 degrees. The arrangement of the other three weld solidification parts is the same as that of the first weld solidification part; or, in other words, at least 80% of the first angle overlaps with the second angle.

[0036] It should be understood that any technical means that are consistent with the core concept of the first embodiment of the electric valve and various variations thereof are within the scope of protection claimed in this application.

[0037] Combination Figures 9-10 In the second embodiment of the electric valve of this invention, compared with the first embodiment of the electric valve, the number of flow holes 3114 is the same, which is 4, and the number of weld solidification parts 5 is 2. The weld solidification parts 5 are located above the spaced flow holes 3114, that is, there are weld solidification parts 5 above the first flow hole and the third flow hole. The rest of the design is the same as the first embodiment of the electric valve, and will not be described again here. This arrangement is also conducive to preventing the valve seat 3111 from deforming due to welding and reducing the sealing problem of the valve port 3112.

[0038] Combination Figures 11-12 In the third embodiment of the electric valve of this invention, compared with the first embodiment of the electric valve, the number of flow holes 3114 is 6, the number of weld solidification parts 5 is 6, and each flow hole 3114 has a weld solidification part 5 above it. The rest of the concept is the same as the first embodiment of the electric valve, and will not be described again here. Of course, in the first variant of the third embodiment of the electric valve, when the number of flow holes 3114 is set to 6, the number of weld solidification parts 5 can be set to 3, and the weld solidification parts 5 are located above the spaced-apart flow holes 3114.

[0039] Similarly, when there are two flow holes 3114, the number of weld solidification parts 5 can also be set to two, with each weld solidification part 5 positioned above the flow hole 3114. Conversely, when there are five flow holes, the number of weld solidification parts can be five, four, or three, with each weld solidification part positioned above the flow hole. Any technical means consistent with the core concept of this solution are within the scope of protection claimed in this application.

[0040] Combination Figures 13-14 In the fourth embodiment of the electric valve of this invention, compared with the first embodiment of the electric valve described above, the welded solidification part 5 is in the form of a weld spot. The welded solidification part 5 is formed by spot welding the connecting seat 312 and the valve seat part 311. There are four welded solidification parts 5, each including three weld spots spaced at a predetermined distance. The welded solidification parts 5 are disposed above the flow hole 3114. This arrangement can also prevent the valve seat 3111 from deforming. Of course, see... Figure 15 In the first variant of the fourth embodiment of the electric valve, the number of weld points in each welded solidification part 5 can be one. The volume of the weld point can be relatively large compared to three weld points, and the center of the weld point and the corresponding flow hole are on the same plane. Of course, in other embodiments, the welded solidification part 5 may not have three weld points but three weld seams. Any technical means that are consistent with the core concept of this solution are within the scope of protection claimed in this application.

[0041] Combination Figure 6 , Figure 8 The connecting seat 312 also includes a balance hole 9, which passes through the connecting seat 312 and is used to balance the pressure at both ends of the connecting seat 312. In this embodiment, the balance hole 9 is staggered from the flow hole 3114, that is, the balance hole 9 is not set above the flow hole, which is beneficial to improve the welding strength. Of course, in other embodiments, the balance hole can also be set above the flow hole 3114, provided that the welding strength is guaranteed.

[0042] See Figure 20 and combined Figure 7 , Figure 8 The present invention also provides a welding method for welding the above-mentioned electric valve 100. The electric valve 100 includes a valve seat component 31, which includes a valve seat portion 311 and a connecting seat 312. The valve seat portion 311 has a valve port 3112 and at least two flow holes 3114. A first embodiment of the welding method includes the following steps:

[0043] Limit the valve seat 311 and the connecting seat 312;

[0044] Obtain the position of valve seat component 31;

[0045] Based on the obtained position of the valve seat component 31, the junction of the valve seat portion 311 and the connecting seat 312 is melted by a laser beam to form at least two weld solidification portions 5. These at least two weld solidification portions include a first weld solidification portion and a second weld solidification portion. The first and second weld solidification portions are discontinuous. One flow hole 3114 is located between the first weld solidification portion and the valve port 3112, and the other flow hole 3114 is located between the second weld solidification portion and the valve port 3112. The flow holes act as a barrier to welding stress. The flow holes 3114 can prevent the welding stress of the weld solidification portion from being transmitted to the lower part of the valve seat portion, preventing the valve seat from deforming in the axial direction. Simultaneously, they prevent changes in the roundness of the valve port 3112 or the center of the valve port 3112 from shifting, thereby improving the fitting accuracy between the valve core component 36 and the valve port 3112, improving sealing performance, and reducing leakage.

[0046] In this embodiment, the connecting seat 312 is located below the partial valve seat portion 311. The incident angle of the laser beam is at a set angle to the central axis M of the valve seat component 31. The set angle ranges from 30° to 60°. In this embodiment, the set angle is 45°. Of course, as long as the welding strength requirements are met, the set angle can be other angles. The weld solidification portion is located below the flow hole 3114, and the weld solidification portion is in the form of a weld seam or a weld point.

[0047] One of the valve seat portion 311 or the connecting seat 312 is provided with a hole, groove, or identification mark. The position of the valve seat component 31 is obtained by acquiring the hole, groove, or identification mark. In this embodiment, the position of the valve seat portion 311 is obtained based on the flow hole 3114, and the position of the valve seat component 31 is obtained based on the position of the valve seat portion 311. After the position of the valve seat portion 31 is acquired, a laser beam is generated immediately or after a preset delay. The welded solidified portion is in the form of a weld seam or a weld point. The laser beam is aligned with the joint between the valve seat portion 311 and the connecting seat 312.

[0048] See Figure 20 and combined Figure 7 , Figure 8The present invention also provides a welding fixture capable of welding the electric valve 100 described above. The electric valve 100 includes a valve seat component 31, which includes a valve seat portion 311 and a connecting seat 312. The valve seat portion 311 has a valve port 3112 and at least two flow holes 3114. The welding fixture includes a clamp 8 capable of clamping and fixing the valve seat portion 311 and the connecting seat 312. The welding fixture also includes a laser welding device, which has at least one laser 6. The laser beam generated by the laser 6 can be aligned with the valve seat portion 311 and the connecting seat 312. The welding fixture can obtain the position of the valve seat component 31; the laser 6 generates a laser beam based on the obtained position of the valve seat component 31 to melt the joint between the valve seat part 311 and the connecting seat 312, forming at least two weld solidification parts 5. The at least two weld solidification parts include a first weld solidification part and a second weld solidification part. The first weld solidification part and the second weld solidification part are discontinuous. One flow hole 3114 is located between the first weld solidification part and the valve port 3112, and the other flow hole 3114 is located between the second weld solidification part and the valve port 3112. The flow hole plays a blocking role in welding stress. The flow hole 3114 can prevent the welding stress of the weld solidification part from being transmitted to the bottom of the valve seat part, preventing the valve seat from deforming in the axial direction, and at the same time preventing the roundness of the valve port 3112 from changing or preventing the center of the valve port 3112 from shifting, thereby improving the fitting accuracy between the valve core component 36 and the valve port 3112, improving the sealing performance, and reducing leakage.

[0049] In this embodiment, the welding fixture also includes a position detection device 7. The position detection device 7 can obtain the position of the valve seat portion 311 based on the flow hole 3114, and obtain the position of the valve seat component 31 based on the position of the valve seat portion 311; or, one of the valve seat portion 311 or the connecting seat 312 is provided with a hole, groove or identification mark, and the position detection device 7 obtains the position of the valve seat component 31 by obtaining the hole, groove or identification mark.

[0050] In this embodiment, the connecting seat 312 is located below the partial valve seat portion 311. The clamp 8 can clamp the connecting seat 312, and the valve seat portion 311 and the connecting seat 312 are connected in a limiting manner. The incident angle of the laser beam is at a set angle with the central axis M of the valve seat component 31. The set angle is between 30° and 60°. In this embodiment, the set angle is 45°. Of course, as long as the welding strength requirements are met, the set angle can also be other angles. The weld solidification part is located below the flow hole 3114, and the valve port 3112 is located above the flow hole 3113. Of course, in other embodiments, the end where the valve seat 3111 is located can be set downward or tilted.

[0051] When the laser welding equipment has a laser 6, either the fixture 8 or the laser 6 can rotate. After the first weld solidification section is formed, the laser 6 stops generating the laser beam. Based on the result obtained by the position detection device 7, the laser generates the laser beam again above the next flow hole or another flow hole to form the second weld solidification section. For example, when there are four flow holes 3114, arranged in the order of first flow hole, second flow hole, third flow hole, and fourth flow hole, the first weld solidification section can be formed below the first flow hole, the second weld solidification section below the second flow hole, the third weld solidification section below the third flow hole, and the fourth weld solidification section below the fourth flow hole; or the first weld solidification section can be formed below the first flow hole, then skipping the second flow hole, and forming the second weld solidification section above the third flow hole.

[0052] In this embodiment, the valve seat 311 and the connecting seat 312 are limited by an interference fit. Pressing before welding can improve production efficiency. Of course, in other embodiments, the valve seat 311 and the connecting seat 312 may not be limited by press fitting to form the valve seat component 31. Instead, they may be limited by a clearance fit, and then the valve seat 311 and the connecting seat 312 may be limited by a positioning fixture.

[0053] In another embodiment of the welding fixture, when there are two lasers, the lasers 6 are symmetrically arranged on both sides of the valve seat component 31; when there are three lasers, the lasers are arranged at equal angles around the central axis of the valve seat component; when there are four lasers, the lasers are arranged at equal angles around the central axis M of the valve seat component.

[0054] In the first embodiment of the welding fixture, the laser welding equipment has a laser 6. Either the fixture or the laser can rotate. After forming the first solidified weld portion, the laser stops generating a laser beam. Based on the result obtained by the position detection device, the laser generates a laser beam again below the next or another flow hole, forming a second solidified weld portion. When there are only two solidified weld portions, forming the second solidified weld portion completes the welding of the valve seat and the connecting seat. When the number of solidified weld portions is greater than two, the fixture or the laser is rotated, and the above process of forming solidified weld portions is repeated. In this embodiment, the fixture rotates while the laser remains stationary; the fixture continues to rotate until welding is completed. Of course, in other embodiments, the fixture may not rotate continuously.

[0055] In the second embodiment of the welding fixture, when the number of lasers is the same as the number of weld solidification parts, the lasers generate laser beams simultaneously, and the lasers are arranged at intervals to form a corresponding number of weld solidification parts, thus completing the welding of the valve seat and the connecting seat.

[0056] In a third embodiment of the welding fixture, when the number of solidified weld portions is an integer multiple of the number of lasers, either the fixture or the laser can rotate. The lasers are evenly spaced around the central axis of the valve seat component. The lasers simultaneously generate laser beams and form the same number of solidified weld portions as the lasers themselves. The lasers then pause laser beam generation, and the fixture or laser rotates. Based on the results obtained by the position detection device, the lasers generate laser beams again below the next set of flow holes, completing the welding of the valve seat and the connecting seat. In this embodiment, the fixture rotates while the lasers remain stationary; the fixture continues to rotate until welding is complete. Of course, in other embodiments, the fixture may not rotate continuously.

[0057] In this embodiment, the position detection device includes a photoelectric sensor. The photoelectric sensor detects the position of the valve seat 311 by detecting the flow hole 3114. The photoelectric sensor determines the position of the flow hole by detecting the edge point corresponding to the maximum arc length along the circumferential direction of the outer edge of the flow hole 3114. The extension direction of the photoelectric sensor is on the same plane as the laser beam generated by the laser. The photoelectric sensor 7 and the laser 6 are located on the same side. When the photoelectric sensor detects the flow hole, the laser generates a laser beam. In this embodiment, the photoelectric sensor 7 determines the position of the flow hole 3114 by detecting the edge point corresponding to the maximum arc length along the circumferential direction of the outer edge of the flow hole 3114. When the photoelectric sensor 7 detects the flow hole, the laser 6 generates a laser beam. There are two edge points corresponding to the maximum arc length along the circumferential direction of the outer edge of the flow hole 3114. In this embodiment, one edge point is selected. Figure 20 The left edge point. Of course, in other embodiments, any edge point of the hole can be detected, and the laser beam should be irradiated based on the known circumference and rotation speed of the valve seat.

[0058] In the embodiment of the welding fixture of the present invention, more than 80% of the arc length of the weld solidification portion 5 is located within the coverage area of ​​the maximum arc length along the circumferential direction of the outer edge of the flow hole 3114, and the final structure after welding is the same as that of the embodiment of the electric valve 100 described above. As long as the arc length of the weld solidification portion is more than 80% located within the coverage area of ​​the maximum arc length along the circumferential direction of the outer edge of the flow hole, it is within the scope of protection claimed in this application.

[0059] In the first embodiment of the welding fixture, there are four flow holes 3114, and four weld solidification portions are formed, with one weld solidification portion below each flow hole 3114; or in a variant, when there are four flow holes 3114, one weld solidification portion is provided below each of two opposite flow holes; the weld solidification portion is in the form of a weld seam or a weld point.

[0060] In another variation, there are two flow holes 3114 and two weld solidification sections formed by welding. Each flow hole 3114 has a weld solidification section below it, which can be in the form of a weld seam or a weld point.

[0061] In another variation, there are three flow holes 3114 and three weld solidification sections formed by welding, with one weld solidification section below each flow hole 3114.

[0062] In another variation, there are six flow holes 3114 and six weld solidification portions formed by welding, with one weld solidification portion below each flow hole 3114; or there are three weld solidification portions located below the spaced-apart flow holes 3114, and the weld solidification portions are in the form of weld seams or weld points; of course, when there are six flow holes 3114, the number of weld solidification portions can also be four or five. Any technical means consistent with the core concept of this solution are within the scope of protection claimed in this application.

[0063] 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 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 invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An electric valve, comprising valve components, characterized in that, The valve component includes a valve core component and a valve seat component. The valve seat component includes a valve seat portion and a connecting seat. The valve seat portion has a valve port. The valve core component is movable relative to the valve port. The connecting seat has a through hole portion. The valve seat portion is inserted into the through hole portion. The lower end of the connecting seat is fixed to the valve seat portion by welding. There are at least two weld solidification portions between the lower end of the connecting seat and the valve seat portion. Adjacent weld solidification portions are discontinuous. The valve seat portion has at least two flow holes. The flow holes are formed in the circumference of the valve seat portion and penetrate the side wall of the valve seat portion. The weld solidification portions are located between the flow holes and the connecting seat. At least a portion of the flow holes are located between the weld solidification portions and the valve port.

2. The electric valve according to claim 1, characterized in that, The valve seat includes a mounting section and a flow hole forming section. The through hole of the connecting seat mates with the mounting section to restrict the relative radial position of the valve seat and the connecting seat. The flow hole is formed in the flow hole forming section, and the outer diameter of the flow hole forming section is larger than the outer diameter of the mounting section. The lower end of the connecting seat abuts against the upper end of the flow hole forming section to restrict the relative axial position of the valve seat and the connecting seat. The welded solidification section connects the lower end of the connecting seat and the upper end of the flow hole forming section.

3. The electric valve according to claim 1 or 2, characterized in that, The weld solidification portion is formed by laser welding. The valve seat portion is generally cylindrical. Along the circumferential direction of the valve seat portion, more than 80% of the arc length of each weld solidification portion is located within the coverage area of ​​the maximum arc length along the circumferential direction of the corresponding flow hole outer edge.

4. The electric valve according to claim 3, characterized in that, The number of flow holes is greater than or equal to 2, the number of solidified welded portions is less than or equal to the number of flow holes, the solidified welded portions are in the form of weld seams or weld points, projected along the axial direction of the valve seat component, each solidified welded portion is located within the coverage area of ​​the maximum arc length along the circumferential direction of the outer edge of the corresponding flow hole, and each solidified welded portion is spaced apart from the valve port by one flow hole.

5. The electric valve according to claim 4, characterized in that, The number of flow holes is 2, the number of weld solidification parts is 2, and each flow hole has a weld solidification part above it.

6. The electric valve according to claim 4, characterized in that, The number of flow holes is 4, the number of weld solidification parts is 4, and each flow hole has one weld solidification part above it; or the number of weld solidification parts is 2, and the weld solidification parts are located above the flow holes that are spaced apart.

7. The electric valve according to claim 4, characterized in that, The number of flow holes is 6, the number of weld solidification parts is 6, and each flow hole has a weld solidification part above it; or the number of weld solidification parts is 3, and the weld solidification parts are located above the flow holes that are spaced apart.

8. The electric valve according to claim 1 or 2, characterized in that, The electric valve further includes a valve body and a coil assembly. The valve component is assembled with the valve body. The coil assembly includes a stator assembly. The valve component also includes a magnetic rotor and a rotor shaft. When the stator assembly is energized, an excitation magnetic field is generated. The magnetic rotor can rotate in the excitation magnetic field. The rotor shaft is drivenly connected to the valve core component. When the line connecting the midpoint of the weld solidification part and the midpoint of the flow hole is coplanar with the axis of the rotor shaft, the angle of the weld solidification part around the axis of the rotor shaft is a first angle. The maximum angle of the flow hole around the axis of the rotor shaft is a second angle. The first angle is less than or equal to the second angle; or at least 80% of the first angle overlaps with the second angle.

9. The electric valve according to claim 1 or 2, characterized in that, The electric valve further includes a valve body and a coil assembly. The valve component is assembled with the valve body. The coil assembly includes a stator assembly. The valve component includes a magnetic rotor and a rotor shaft. When the stator assembly is energized, an excitation magnetic field is generated. The magnetic rotor can rotate in the excitation magnetic field. The rotor shaft is drivenly connected to the valve core component. When the line connecting the midpoint of the weld solidification part and the midpoint of the flow hole is not in the same plane as the axis of the rotor shaft, the angle of the weld solidification part around the axis of the rotor shaft is a first angle, and the maximum angle of the flow hole around the axis of the rotor shaft is a second angle. The first angle is less than or equal to the second angle; or at least 80% of the first angle overlaps with the second angle.

10. The electric valve according to claim 1 or 2, characterized in that, The connector also includes a balance hole that penetrates the connector and is offset from the flow hole.

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