Manufacturing method of throttle valve

Abstract

The manufacturing method is characterized in that the throttle valve comprises a sleeve, a connecting pipe and a valve seat, the connecting pipe is close to the valve seat relative to the sleeve in the axial direction of the throttle valve, and the connecting pipe and the valve seat are made of dissimilar metal materials; the manufacturing method comprises the following steps that S1, the valve seat and the connecting pipe are assembled, specifically, the valve seat and the connecting pipe are fixed through induction brazing, and at least part of the first assembly is formed; s2, assembling parts in the sleeve to form at least part of a second assembly; s3, assembling the first assembly and the second assembly to form at least part of a third assembly; and S4, the third assembly and the sleeve are assembled, specifically, the sleeve is arranged on the periphery of the second assembly, and the sleeve and the connecting pipe are fixed through laser welding. According to the manufacturing method of the throttle valve, the heat influence of heat conduction in the welding process on parts in the sleeve can be reduced.

Description

Technical Field

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

[0002] In the related technology, the valve device includes a valve core assembly, a valve seat assembly, a nut assembly, a rotor assembly and a sleeve. The valve core assembly is fixedly or limit-connected to the rotor assembly, the nut assembly is fixedly connected to the valve seat assembly, the valve core assembly is transmission-connected to the nut assembly, the valve core assembly, the rotor assembly and the nut assembly are located in an accommodating cavity formed by the valve seat assembly and the sleeve, the valve seat assembly is welded and fixed to the sleeve, and the rotor assembly drives the valve core assembly to move axially, thereby adjusting the opening of the valve port.

[0003] In the related art, the valve seat and sleeve are both made of stainless steel, which increases the weight of the valve device and is not conducive to reducing production costs; although in some related technologies, in order to save manufacturing costs, the sleeve and the valve seat are made of dissimilar metals, but when the sleeve and the valve seat are welded and fixed, due to the problem of heat conduction during the welding process, the internal components of the sleeve such as the rotor assembly, the valve core assembly and other components are thermally affected, thereby affecting the performance of the valve. Summary of the invention

[0004] The purpose of the present application is to provide a method for manufacturing a throttle valve, which is beneficial to reducing the thermal impact of the welding process on the internal components of the sleeve.

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

[0006] A method for manufacturing a throttle valve, characterized in that the throttle valve comprises a sleeve, a connecting pipe, and a valve seat, wherein along the axial direction of the throttle valve, the connecting pipe is closer to the valve seat than the sleeve, and the connecting pipe and the valve seat are made of dissimilar metal materials; the manufacturing method comprises the following steps:

[0007] S1. Assembling the valve seat and the connecting pipe: the valve seat and the connecting pipe are fixed by induction brazing to form at least part of the first assembly;

[0008] S2. Assembling the inner parts of the casing to form at least a portion of the second assembly;

[0009] S3. Assembling the first component and the second component to form at least part of a third component;

[0010] S4. Assemble the third component and the sleeve: place the sleeve on the outer periphery of the second component, and fix the sleeve and the connecting pipe by laser welding.

[0011] In an embodiment provided in the present application, the throttle valve includes a connecting pipe, a sleeve and a valve seat. During the manufacturing process of the throttle valve, the sleeve and the connecting pipe are fixed by induction brazing to form a first component, and the inner components of the sleeve are assembled. The sleeve and the connecting pipe are fixed by laser welding. The heat source of laser welding is concentrated and the heating speed is fast, which can reduce the thermal impact of heat conduction during welding on the inner components of the sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a three-dimensional structural schematic diagram of a specific embodiment of a throttle valve;

[0013] Figure 2 for Figure 1 A schematic cross-sectional view of a valve component of a middle throttle valve;

[0014] Figure 3 for Figure 2 A partial enlarged view of middle C;

[0015] Figure 4 for Figure 1 Schematic diagram of the connection of the valve seat, connecting pipe and nut assembly of the middle throttle valve;

[0016] Figure 5 for Figure 4 A partial enlarged view of B in the middle;

[0017] Figure 6 It is a connection diagram of the valve seat and connecting pipe of the throttle valve;

[0018] Figure 7 for Figure 6 A is a partial enlarged schematic diagram;

[0019] Figure 8 middle Figure 6 A schematic diagram of an embodiment of a welding portion;

[0020] Fig. 9 middle Figure 6 A schematic diagram of another embodiment of a welding portion;

[0021] Fig.10 It is a structural schematic diagram of a valve seat of a throttle valve;

[0022] Fig.11 for Figure 1 A schematic diagram of the structure of the fixing seat of the middle throttle valve;

[0023] Fig.12 for Figure 1 A schematic diagram of the structure of the connecting piece of the middle throttle valve;

[0024] Fig.13 for Figure 1 A schematic diagram of the structure of the nut main body of the middle throttle valve;

[0025] Fig.14 is a schematic structural diagram of a second specific embodiment of a valve component;

[0026] Fig.15 for Fig.14 A schematic diagram of the structure of a nut assembly;

[0027] Fig.16 for Fig.14 A structural schematic diagram of a nut seat;

[0028] Fig.17 for Figure 1 Exploded view of the middle valve component.

[0029] The reference numerals in the figures are as follows: 10, stator component; 11, coil assembly; 12, injection molding portion; 13, welding portion; 200, valve component; 20, valve seat; 21, mounting groove; 23, first step portion; 231, first side wall portion; 232, first bottom wall portion; 201, accommodating cavity; 24, second step portion; 241, second bottom wall portion; 242, second side wall portion; 2421, gap section; 2422, interference section; 25, third step portion; 251, third side wall portion; 2511, guide section; 2512, transition section; 2513, matching section; 252, third bottom wall portion; 27, valve seat; 271. Valve port; 272. Side hole; 30. Nut assembly; 31. Nut seat; 311. Mounting hole; 312. Nut body; 3121. Fitting portion; 313. Connector; 3131. Reinforcement portion; 32. Fixing seat; 320. Mounting cavity; 321. Body; 322. Flange; 323. Annular boss; 40. Valve core assembly; 41. Screw rod; 42. Valve core; 50. Rotor assembly; 60A. Sleeve; 60B. Connecting pipe; 601. First connecting section; 602. Second connecting section; 70. First sealing member; 71. Second sealing member; 72. Third sealing member; 80. Solder. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The same parts are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0031] It should be understood that although the first, second, third, fourth, etc. may be used to describe various information in this application, these information should not be limited to these descriptions. These terms are only used to distinguish the same type of information from each other. Multiple means two or more. In the absence of conflict, the various embodiments in this application can complement each other.

[0032] The valve device can be applied to a vehicle thermal management system or an air conditioning system. In the vehicle thermal management system, the valve device is often used as a throttling element or a switching element. Figure 1 , an embodiment of a valve device, the valve device includes a valve component 200 and a stator component 10, the stator component 10 is located at the periphery of at least part of the valve component 200, the stator component 10 is fixedly or positionally connected to the valve component 200, and further, a sealing arrangement can be provided between the stator component 10 and the valve component 200, which is beneficial to prevent water vapor or other impurities in the external environment from entering through the assembly gap between the stator component 10 and the valve component 200, causing corrosion or failure inside the stator component 10. The stator component 10 includes a coil assembly 11 and an injection molding part 12, the injection molding part 12 covers at least part of the coil assembly 11, that is, the stator component 10 is at least injection-molded with the coil assembly 11 as an insert, and the valve device is electrically connected and / or signal-connected to the outside world through the stator component 10.

[0033] Combination Figure 1-Figure 13 The valve component 200 includes a valve seat 20, a nut assembly 30, a sleeve 60A, a connecting pipe 60B, a rotor assembly 50 and a valve core assembly 40. The stator component 10 is located on the outside of the sleeve 60A, the rotor assembly 50 is located in the inner cavity of the sleeve 60A, the valve core assembly 40 is fixedly or limit-connected with the rotor assembly 50, and the valve core assembly 40 is transmission-connected with the nut assembly 30. A predetermined current is passed through the stator component 10 to generate an excitation magnetic field to drive the rotor assembly 50 to rotate. The rotor assembly 50 drives the valve core assembly 40 to rotate. The valve core assembly 40 and the nut assembly 30 are threadedly matched to convert the rotation of the rotor assembly 50 into an axial movement of the valve core assembly 40 relative to the valve seat 20. In this embodiment, the valve core assembly 40 includes a screw rod 41 and a valve core portion 42. The screw rod 41 and the valve core portion 42 are separate structures and are connected. It can be understood that the connection method includes a fixed connection, a limit connection or a transmission connection. The screw rod 41 is formed with an external thread, and the nut assembly 30 is formed with an internal thread that matches therewith. The screw rod 41 and the nut assembly 30 are threadedly matched to convert the rotation of the rotor assembly 50 into an axial movement of the screw rod 41 relative to the nut assembly 30. Of course, in other embodiments, the screw rod 41 and the valve core portion 42 can also be an integral structure or integrally formed. The valve component 200 also includes a valve seat 27, and the valve seat 27 has a valve port 271. The valve core assembly 40 can move axially relative to the valve port 271. The valve core portion 42 of the valve core assembly 40 cooperates with the valve port 271 to adjust the flow area of ​​the valve port 271 or the opening of the valve port 271, thereby realizing the flow regulation of the refrigerant. For the convenience of description, the upper and lower directions are defined as the upper and lower directions in the attached drawings of the specification. Figure 1 The up and down directions only indicate relative positions and do not represent the actual status of the product when in use.

[0034] In this embodiment, if Figure 2As shown, the throttle valve includes a rotor assembly 50, a nut assembly 30 and a valve core assembly 40 screw rod 41. The rotor assembly 50 is fixedly or limitably connected to the screw rod 41 and the valve core assembly 40, and the screw rod 41 of the valve core assembly 40 is transmission-connected to the nut assembly 30; the throttle valve includes a sleeve 60A, a connecting pipe 60B and a valve seat 20. The rotor assembly 50 is located in the inner cavity of the sleeve 60A, and the rotor assembly 50 is located on the outer periphery of the nut assembly 30. Along the axial direction of the throttle valve, the connecting pipe 60B is close to the valve seat 20 relative to the sleeve 60A. The connecting pipe 60B and the valve seat 20 are both made of metal materials with different materials. One end of the connecting pipe 60B is fixedly connected to the valve seat 20 by a first welding method, and the other end of the connecting pipe 60B is fixedly connected to the sleeve 60A by a second welding method. The materials of the connecting pipe 60B and the valve seat 20 are different. For example, the material of the connecting pipe 60B is stainless steel, and the material of the valve seat 20 is aluminum alloy. In the related art, the connecting pipe 60B and the valve seat 20 are both stainless steel. In the present application, the valve seat 20 is changed to aluminum alloy, which relatively reduces the cost while meeting the performance requirements. Different welding methods are used to connect the connecting pipe and the valve seat, and the connecting pipe and the sleeve. The appropriate welding method can be selected according to different needs. For example, in the related art, the sleeve is made of stainless steel and the valve seat is made of aluminum alloy. After the rotor assembly, the valve core assembly and other parts are assembled, the sleeve is set on the periphery of the rotor assembly, and the sleeve and the valve seat are fixedly connected by induction brazing. The heating of induction brazing is uniform and the heating speed is fast. The selection of appropriate solder can improve the welding strength of aluminum and steel. However, the heat source of induction brazing heating is not concentrated, that is, when the current of the sleeve changes in the electromagnetic field, the sleeve will heat up, and the heat will be transferred to the components in the sleeve such as the rotor assembly and the valve core assembly, and affect them. The present application adopts a segmented welding method, that is, a connecting pipe is provided on the throttle valve, and the connecting pipe is also made of stainless steel. The connecting pipe and the valve seat are connected by a first welding method, such as brazing. Selecting a suitable solder is conducive to the welding of aluminum and stainless steel. Induction brazing can be selected, and of course vacuum furnace brazing or tunnel brazing can also be selected; then the rotor assembly, valve core assembly, etc. are assembled, and the sleeve is sleeved on the outer periphery of the rotor assembly. The sleeve and the connecting pipe are fixedly connected by a second welding method. Since the sleeve and the connecting pipe are made of stainless steel, the second welding method can be laser welding, argon arc welding, etc. The present application adopts laser welding, and the heat source is concentrated and the heating speed is fast, and no solder is required, which can reduce the thermal impact of welding on the rotor assembly and the valve core assembly.

[0035] The valve seat 20 and the connecting pipe 60B are heterogeneous. Since the physical properties of aluminum alloy and stainless steel are quite different, the connection between the two materials is difficult, and the performance of the two after connection is relatively poor. To solve the above problems, the valve seat 20 of the present application is roughly hollow and cylindrical, and the valve seat 20 has a mounting groove 21. The part of the connecting pipe 60B is located in the mounting groove 21. The part of the connecting pipe 60B located in the mounting groove 21 is defined as the first connecting section 601. The part of the outer wall of the first connecting section 601 is interference fit with the wall forming the mounting groove 21. The connecting pipe 60B is fixed to the valve seat 20 by induction brazing. In this scheme, the solder 80 is directly arranged on the outer periphery of the connecting pipe 60B, and the part of the solder 80 is against the end of the valve seat 20. The solder 80 is melted by induction heating, and the welding fixation of the connecting pipe 60B and the valve seat 20 can be realized. The connecting pipe includes a second connecting section. Along the axial direction of the connecting pipe, the second connecting section is close to the sleeve relative to the first connecting section, and the second connecting section is fixedly connected to the sleeve. Specifically, the upper end of the second connecting section is fixed to the lower end of the sleeve by laser welding. Compared with other welding methods, laser welding has a concentrated heat source and a fast heating speed, and has less thermal impact on the inner parts of the sleeve, such as the rotor assembly and the valve core assembly.

[0036] In some embodiments, the throttle valve includes a accommodating chamber 201, and the accommodating chamber 201 is used to place the solder 80. Specifically, the valve seat 20 includes a first step portion 23, and the first step portion 23 is formed on the wall of the mounting groove 21. The first step portion 23 is arranged in an annular shape. The first step portion 23 is located on the valve seat 20 near the end of the connecting pipe 60B. The first step portion 23 includes a first side wall portion 231 and a first bottom wall portion 232. The throttle valve includes a accommodating chamber 201. The wall forming the accommodating chamber 201 includes a first side wall portion 231, a first bottom wall portion 232 and a part of the outer wall of the first connecting section 601. The accommodating chamber 201 is used to place the solder 80; that is, along the radial direction of the throttle valve, a accommodating chamber 201 is formed between the first step portion 23 of the valve seat 20 and the connecting pipe 60B. It can also be understood that, Figure 8 As shown, after the connecting pipe and the valve seat are welded, the throttle valve includes a welding portion 13, at least part of which is located in the accommodating cavity 201. The arrangement of the accommodating cavity 201 can reduce the overflow of the solder 80 during the flow process, that is, the solder 80 remains at the end of the valve seat 20, affecting the assembly of the seal.

[0037] The connecting pipe 60B is connected to the valve seat 20 in a limited position, that is, before the connecting pipe 60B is welded to the valve seat 20, the connecting pipe 60B and the valve seat 20 are relatively fixed, and the coaxiality of the connecting pipe 60B and the valve seat 20 is ensured while the relative position is limited. In this embodiment, the connecting pipe 60B and the valve seat 20 are press-fitted, that is, the interference fit is used for limited position fixing, so as to ensure that the fitting of the connecting pipe 60B and the valve seat 20 is not loose, and the relative position of the two is ensured while ensuring that the welding gap between the two is relatively uniform. Specifically, the valve seat 20 includes a second step portion 24, and along the axial direction of the valve device, the second step portion 24 is away from the opening end of the valve seat 20 relative to the first step portion 23, and the second step portion 24 includes a second side wall portion 242 and a second bottom wall portion 241, and the lower end portion of the second connecting section 602 of the connecting pipe 60B abuts against the second bottom wall portion 241 of the second step portion 24, and at least part of the outer wall portion of the connecting pipe 60B abuts against the second side wall portion 242. In the present application, the connecting pipe 60B and the valve seat 20 are fixed by welding. Specifically, the solder 80 is sleeved on the outer wall of the sleeve 60A and is located at the upper end of the valve seat 20. The upper end of the valve seat 20 supports the solder 80. The outer wall of the connecting pipe 60B is interference fit with the inner wall of the valve seat 20, and another part of the connecting pipe 60B above the interference fit position has a gap with the inner wall of the valve seat 20, so that the solder 80 melts and fills the gap, thereby fixing the connecting pipe 60B and the valve seat 20. Specifically, the second side wall portion 242 of the second step portion 24 includes a gap section 2421 and an interference section 2422, and along the axial direction of the throttle valve, the gap section 2421 is close to the opening of the valve seat 20 relative to the interference section 2422, wherein the gap section 2421 and the sleeve 60A are clearance-matched, and the interference section 2422 and the sleeve 60A are interference-matched. The distance from the gap section 2421 of the second side wall portion 242 to the sleeve 60A is defined as K, then 0.05<K≤0.3mm, and the gap value K is appropriately adjusted according to the difference in thermal expansion coefficients of different materials. The length of the gap section 2421 along the axial direction of the valve device is defined as L, and the thickness of the sleeve 60A is defined as T, then L=2.5T-5.5T. During assembly, the sleeve 60A and the valve seat 20 are fixed with interference fit before welding. The solder 80 is located at the upper end of the valve seat 20, and the solder 80 is sleeved on the sleeve 60A. During welding, the sleeve 60A and the gap section 2421 of the valve seat 20 are matched with a small gap, and the gap is controlled at 0.05-0.3mm. Due to capillary action and the gravity of the welding liquid, the welding liquid flows into the gap between the sleeve 60A and the valve seat 20 to fill the gap, and then cools and solidifies. That is, the length of the gap section 2421 is the length of the weld. The length of the gap section 2421 is controlled to be 2.5 times to 5.5 times the thickness of the sleeve 60A. When the weld is too short, the connection strength between the valve seat 20 and the sleeve 60A is insufficient. When the weld is too long, there is a risk of failing to fill the gap due to the fluidity of the welding liquid, resulting in a poor weld. A reasonable weld length is controlled to achieve a better welding result.

[0038] In some embodiments, in order to achieve better welding effect, such as Figure 4 , Figure 7 As shown, the valve device includes a housing chamber 201, and the housing groove is used to accommodate the solder 80, limit the movement of the solder 80, and the housing chamber 201 is connected with the gap formed by the connecting pipe 60B and the inner wall of the valve seat 20. The width of the housing chamber 201 is defined as W, that is, the radial distance from the side of the step portion to the outer wall of the sleeve 60A is W, the depth of the housing chamber 201 is defined as H, that is, the axial distance from the opening of the housing chamber 201 to the bottom of the step portion is H, and the diameter of the solder 80 is D, then W>D, H<D, to ensure that the solder 80 can fill the housing chamber 201. Of course, in other embodiments, the cross-section of the solder 80 is not limited to a circle, and can also be a square, elongated, polygonal, etc. structure; in other embodiments, a wire feeding mechanism can also be used to fill the solder 80 into the housing chamber 201 with a wire feeding mechanism. In this application, the solder 80 is brazed in the form of mass production to improve the production rhythm.

[0039] In this embodiment, the material of the connecting pipe 60B is aluminum alloy, and the material of the connecting pipe 60B is stainless steel. Due to the different materials of the two, high-frequency induction welding is adopted. High-frequency induction welding heats quickly, evenly, and has high efficiency, that is, the solder 80 is heated evenly, the relative weld heat-affected zone is small, and the deformation of the parts is small. After the connecting pipe 60B is fixedly connected to the valve seat 20, the valve seat 27, the rotor assembly 50, the valve needle assembly, and the nut assembly 30 are assembled. After the above parts are assembled, the sleeve 60A is assembled. The sleeve 60A is a hollow tubular structure, and one end of the sleeve 60A is open and the other end is closed. The lower end of the sleeve 60A is against the upper end of the connecting pipe 60B, and the sleeve 60A is welded and fixed with the connecting pipe 60B. In this embodiment, the sleeve 60A and the connecting pipe 60B are both made of stainless steel, and the welding method of the two is laser welding. The light source of laser welding is stable, and the heat source is relatively concentrated. No solder is needed in the welding process. This embodiment is different from the known technology in that the valve seat 20 of this solution is made of aluminum alloy, which reduces weight and cost at the same time. Since welding of dissimilar materials is difficult, high-frequency induction welding is adopted. When high-frequency induction welding is adopted, in the relevant technical scheme, after the rotor assembly, the valve core assembly, etc. are assembled, the sleeve and the valve seat are welded. Due to the characteristics of high-frequency induction welding, under the action of the changing magnetic field, induced current heating is generated, that is, the heated parts are relatively dispersed, that is, the components in the magnetic field are all heated, and the sleeve is oxidized and discolored after being heated. Therefore, this scheme adopts a segmented welding structure, that is, the connecting pipe 60B is first fixedly connected to the valve seat 20 by induction welding, and after the internal parts are assembled, the sleeve 60A is fixed to the connecting pipe 60B by laser welding, which can reduce the oxidation of the stainless steel sleeve 60A.

[0040] The nut assembly 30 in this embodiment includes a fixing seat 32 and a nut seat 31. Part of the fixing seat 32 is located in the mounting groove 21. Part of the side wall of the fixing seat 32 and the valve seat 20 are interference-connected, threaded, or interference-fitted in combination with adhesive curing bonding, or threaded in combination with adhesive curing bonding. The fixing seat 32 and the sleeve 60A are fixedly connected. Specifically, the fixing seat 32 includes a main body 321 and a flange 322. Along the axial direction of the throttle valve, the main body 321 is closer to the valve seat 20 than the flange 322. The outer diameter of the flange 322 is larger than the outer diameter of the main body 321. The main body 321 is interference-fitted with the valve seat 20, the flange 322 is interference-fitted with the connecting pipe 60B, and the flange 322 is interference-fitted with the sleeve 60A. Combination Figure 4 , Figure 10-12 In detail, the fixing seat 32 and the nut seat 31 are separate structures, and the fixing seat 32 and the nut seat 31 are fixedly connected or limitedly connected, and the fixing method includes injection molding fixing or interference fit or glue curing connection, or interference fit combined with glue curing connection, and at least part of the fixing seat 32 is located on the periphery of the nut seat 31. When the fixing seat 32 and the nut seat 31 are interference fit, such as Figure 4 As shown, the nut seat 31 includes a nut body 312 and a connector 313, the nut body 312 is fixedly connected to the connector 313, a portion of the connector 313 is located at the periphery of the nut body 312, and the outer wall part of the connector 313 is interference fit with the inner wall part of the fixed seat 32. The connector 313 is made of metal, and the material of the nut body 312 is plastic, which can be a special engineering plastic or composite material with a certain strength, such as mechanically reinforced polyetheretherketone material (PEEK) or modified polyetheretherketone material (PEEK), or mechanically reinforced polyphenylene sulfide (PPS) or modified polyphenylene sulfide (PPS) material. The connector 313 is an insert and is injection molded with the nut body 312 to form an integral structure. In order to ensure reliable connection and fixation between the nut body 312 and the connector 313, the connector 313 has a reinforcing portion 3131 on its inner side that is connected to the nut body 312, and the nut body 312 has a matching portion 3121 that matches the reinforcing portion 3131, and the matching portion 3121 is formed by injection molding. Specifically, the reinforcing portion 3131 can be a structure in which the inner side wall of the connector 313 is a non-standard circular structure, such as the inner side shape of the inner side wall cross section can be square, hexagonal, or irregularly circular or plum blossom-shaped with partially straight edges, etc., or the reinforcing portion 3131 can be provided on the basis of a circular structure to make it a non-standard circular structure, such as Figure 9-11As shown, along the radial direction of the connecting member 313, the reinforcing portion 3131 is recessed outward relative to the inner side wall of the connecting portion, or the reinforcing portion 3131 is protruded inward relative to the inner side wall of the connecting portion. The reinforcing portion 3131 can be set at any position where the connecting member 313 and the nut body 312 cooperate. The reinforcing portion 3131 makes the shape of the inner wall of the connecting member 313 a non-standard circle or the contact position between the connecting member 313 and the nut body 312 a non-standard plane. For example, when the cross section of the connecting member 313 is circular, the reinforcing portion 3131 is recessed outward relative to the inner side wall of the connecting portion in the radial direction, and the mating portion 3121 where the nut body 312 and the reinforcing portion 3131 of the connecting member 313 cooperate is a protruding structure, and the mating portion 3121 is formed by injection molding with the nut member. The concave-convex structure matched with the reinforcement part 3131 is used to fix the reinforcement part 3131, so that the connection between the two is more reliable. Even if the connecting piece 313 is subjected to force, the connection strength between the two is increased compared with when the connecting piece 313 is a standard circle. In addition, the concave-convex structure can also be set on the surface, which can also increase the connection strength between the two after injection molding.

[0041] The fixing seat 32 includes a mounting cavity 320, at least part of the nut seat 31 is located in the mounting cavity 320, and the nut seat 31 is fixedly connected to the fixing seat 32 by press-fitting. It can be understood that in this solution, the fixing seat 32 is made of metal, and the fixing seat 32 adopts aluminum alloy to reduce weight and save costs. The fixing seat 32 includes an annular boss 323, that is, the annular boss 323 is formed on the wall forming the mounting cavity 320, at least part of the connecting member 313 is located on the annular boss 323, at least part of the lower end of the connecting member 313 is against the bottom of the annular boss 323, and the outer edge of the connecting member 313 is interference-fitted with the side wall of the annular boss 323 of the fixing seat 32. Thereby limiting the movement of the nut seat 31 in the axial and circumferential directions.

[0042] The fixed seat 32 is fixedly connected to the valve seat 20 by press-fitting. Figure 5 , Fig. 9The valve seat 20 is roughly in the shape of a hollow cylinder and is made of aluminum alloy. The valve seat 20 includes a mounting groove 21, and at least a portion of the fixed seat 32 is located in the mounting groove 21. The valve seat 20 includes a third step portion 25, that is, the third step portion 25 is located in the wall portion forming the mounting groove 21, and at least a portion of the main body 321 of the fixed seat 32 is against the third step portion 25, and the fixed seat 32 and the valve seat 20 are interference fit. Specifically, the third step portion 25 includes a third side wall portion 251 and a third bottom wall portion 252. The third bottom wall portion 252 abuts against the lower end of the fixed seat 32, thereby limiting the fixed seat 32 from moving relative to the valve seat 20 in the axial direction of the valve device toward the valve port 271. The third side wall portion 251 includes a guide section 2511, a transition section 2512 and a matching section 2513. Along the axial direction of the throttle valve, the transition section 2512 is located between the guide section 2511 and the matching section 2513. The inner diameter of the transition section 2512 is larger than the inner diameter of the matching section 2513. The transition section 2512 is clearance-fitted with the fixed seat 32, and the matching section 2513 is interference-fitted with the fixed seat 32. Specifically, the guide section 2511 and the transition section 2512 form a certain angle, and the angle is controlled between 25-75 degrees. In contrast, the lower end of the fixed connector 313 has a guide structure, and the guide section 2511 of the valve seat 20 matches the guide structure of the fixed seat 32, which is convenient for assembly. The valve seat 20 is provided with a step portion, and the fixed seat 32 abuts against the step surface of the step portion. The setting of the step surface can limit the axial movement of the fixed seat 32, so that the connecting piece 313 is positioned at a suitable position. Along the axial direction of the valve device, one end of the fixed seat 32 is interference fit with the nut seat 31, and the other end of the fixed seat 32 is interference fit with the valve seat 20. Relatively, the nut seat 31 is fixed relative to the valve seat 20. Compared with the known technology, the connecting piece 313 is made of stainless steel, the valve seat 20 is made of stainless steel, and the connecting piece 313 and the valve seat 20 are fixed by welding. This solution omits the welding step and reduces the cost.

[0043] Combination Figure 14-16The second specific embodiment of the valve component 200 of the present application is different from the first specific embodiment in that the nut assembly 30 includes a fixing seat 32 and a nut seat 31. The fixing seat 32 and the nut seat 31 are an integral structure. The fixing seat 32 is made of metal, such as an aluminum alloy with light weight and relatively low cost. The fixing seat 32 is an insert and is injection molded with the nut seat 31 to form an integral structure. The processing method of the fixing seat 32 and the nut seat 31, as well as the reinforcement part 3131 and the matching part 3121 at the connection between the two are the same or similar to the above-mentioned first embodiment. The installation method of the fixing seat 32 and the valve seat 20 is the same or similar to the above-mentioned first embodiment, and no further description is given here. In addition to the above-mentioned interference fit, the fixing connection method of the fixing seat 32 and the valve seat 20 also includes one of threaded connection, interference fit combined with adhesive curing bonding, or threaded connection combined with adhesive curing bonding. In the known technology, the connecting piece 313 is made of stainless steel, and the valve seat 20 is made of stainless steel. The connecting piece 313 and the valve seat 20 are fixedly connected by welding, which increases the weight of the relative valve, and adds a welding process, which increases the cost. In this embodiment, the fixed seat 32 is roughly a hollow cylindrical structure, and the fixed seat 32 includes a flange portion 322 and a main body portion 321. Along the axial direction of the throttle valve, the main body portion 321 extends toward the valve seat 20 relative to the flange portion 322, and the main body portion 321 is fixedly connected to the valve seat 20. Specifically, the valve seat 20 is roughly a hollow cylindrical structure, the valve seat 20 has a mounting groove 21, and the mounting groove 21 passes through the downward end of the valve seat 20, at least part of the main body portion 321 is located in the mounting groove 21, the main body portion 321 has an external thread, and the part of the valve seat 20 that matches the main body portion 321 has an internal thread, and the valve seat 20 is threadedly connected to the nut assembly 30. The threaded connection is matched, and the structure is relatively simple and convenient. The fixed seat 32 is made of metal, and is formed by forging or stamping combined with machining. The external thread of the fixed seat 32 is formed by machining before injection molding, or the external thread of the fixed seat 32 is formed by machining after injection molding; the valve seat 20 is made of metal. In this solution, the valve seat 20 is made of aluminum alloy. The main aluminum alloy is light in weight and has lower cost than stainless steel. The valve seat 20 is formed by forging or stamping combined with machining, and the internal thread of the valve seat 20 is formed by machining.

[0044] The fixing seat 32 also includes a flange portion 322 and a main body portion 321. The main body portion 321 is closer to the valve seat 20 relative to the flange portion 322, and the outer diameter of the flange portion 322 is greater than the outer diameter of the main body portion 321. In the welding process of the connecting pipe 60B and the sleeve 60A, the flange portion 322 plays a positioning role. Specifically, the lower end of the sleeve 60A abuts against the upper end of the connecting pipe 60B, and the flange portion 322 of the fixing seat 32 and the connecting pipe 60B are interference fit. The flange portion 322 of the fixing seat 32 and the sleeve 60A are interference fit. The sleeve 60A is stainless steel, and the sleeve 60A and the connecting pipe 60B are fixed by laser welding. The flange portion 322 of the fixing seat 32 plays a positioning role for the sleeve 60A and the connecting pipe 60B, and ensures the relative position of the sleeve 60A and the connecting pipe 60B. The positioning does not require external parts or tools, and the structure is simple and the cost is low.

[0045] The nut seat 31 includes a mounting hole 311, which passes through the upper and lower ends of the nut seat 31 along the axial direction of the valve device. At least part of the screw rod 41 of the valve core assembly 40 is located in the mounting hole 311, that is, one end of the screw rod 41 passes through the mounting hole 311 of the nut seat 31 and is fixedly connected to the rotor assembly 50. The screw rod 41 is threadedly connected to the nut assembly 30. Specifically, the screw rod 41 is formed with an external thread, and the nut assembly 30 is formed with an internal thread that matches it, that is, the internal thread is formed on the inner side wall of the nut seat 31. The screw rod 41 and the nut seat 31 are threadedly matched, and the rotation of the rotor assembly 50 is converted into an axial movement of the screw rod 41 relative to the nut assembly 30.

[0046] The throttle valve also includes a valve seat 27, which is generally hollow and cylindrical. At least part of the valve core assembly 40 is located in the inner cavity of the valve seat 27. The valve seat 27 has a valve port 271. The valve core assembly 40 can move axially relative to the valve port 271. The valve core portion 42 of the valve core assembly 40 cooperates with the valve port 271 to adjust the flow area of ​​the valve port 271, thereby realizing the flow regulation of the refrigerant. One end of the valve seat 27 is fixed or fiber-connected to the valve seat 20, and the other end of the valve seat 27 is limited or fixedly connected to the nut assembly 30. Specifically, the upper end of the valve seat 27 is located in the mounting hole 311 of the screw rod 41, and the outer wall of the upper end of the valve seat 27 abuts against the wall forming the mounting hole 311, that is, interference fit, and the other end of the valve seat 27 passes through the mounting groove 21 of the valve seat 20 and protrudes from the lower end of the valve seat 20. The outer wall of the valve seat 27 and the wall forming the mounting groove 21 are interference fit, thereby fixing the valve seat 27. The valve seat 27 has a side hole 272, which passes through the inner and outer walls of the valve seat 27, and is located between the valve port 271 and the lower end of the valve seat 20 along the axial direction of the throttle valve.

[0047] The throttle valve further includes a first seal 70, a second seal 71 and a third seal 72. The stator assembly is sleeved on the outer periphery of the sleeve 60A. The stator assembly includes a groove, at least part of the first seal 70 is located in the groove, the first seal 70 is tightly matched with the outer wall of the connecting pipe 60B, or the first seal 70 is tightly matched with the outer wall of the sleeve 60A, the lower end of the first seal 70 is against the welding part of the sleeve 60A and the valve seat 20, and the main function of the first seal 70 is to prevent water, dust, etc. from entering the coil assembly 11 and affecting the performance of the coil assembly 11. It can be understood that the first seal 70 is against the connecting pipe 60B or the sleeve 60A and the sealing position should avoid the welding part of the connecting pipe 60B and the sleeve 60A, because the surface of the welding part is relatively rough, and when it is against the first seal 70, the sealing effect is affected. Along the axial direction of the throttle valve, the second seal 71 and the third seal 72 are respectively located on both sides of the side hole 272, and the second seal 71 is pressed between the valve seat 20 and the valve body, or limits the leakage of the working medium from the valve seat 20 and the valve body to the outside of the valve device. The third seal 72 is pressed between the valve seat 27 and the valve body, limiting the leakage of the working medium from the valve seat 27 and the valve body to the outside of the valve device. The structures that can be used in combination with the various embodiments of the present application through deduction are within the protection scope of the present application.

[0048] The present application also provides a method for manufacturing a throttle valve, Fig.17 An exploded view of a valve component 200 of a throttle valve,

[0049] The throttle valve comprises a sleeve 60A, a connecting pipe 60B, a valve seat 20 and an inner part of the sleeve. Along the axial direction of the throttle valve, the connecting pipe 60B is close to the valve seat 20 relative to the sleeve 60A. The connecting pipe 60B and the valve seat 20 are made of different metals. The manufacturing method comprises the following steps:

[0050] S1. Assembling the valve seat 20 and the connecting pipe 60B: The valve seat 20 and the connecting pipe 60B are fixed by induction brazing to form at least part of the first assembly;

[0051] S2. Assembling the inner member of the casing to form at least a portion of the second assembly;

[0052] S3. Assembling the first component and the second component to form at least a portion of the third component;

[0053] S4. Assemble the third component and the sleeve 60A: place the sleeve 60A on the outer periphery of the second component, and fix the sleeve 60A and the connecting pipe 60B by laser welding.

[0054] It should be noted that the above-mentioned components in the sleeve refer to the components located in the inner cavity of the sleeve, such as the rotor assembly, the valve core assembly and the nut assembly. Using the above-mentioned manufacturing method, the valve seat and the connecting pipe are induction brazed to form a first component. The present application adopts high-frequency induction welding and selects suitable solder. High-frequency induction welding has a fast heating speed and uniform heating. By adopting suitable process parameters, a weld with high welding strength can be obtained. After assembling the inner components of the sleeve, the sleeve is placed on the periphery of the second component. The sleeve and the connecting pipe are welded by laser. The heat source of laser welding is concentrated and the heating speed is fast. Without the need for solder, a good weld can be obtained. This scheme adopts a segmented welding method. Before and after assembling the inner components of the sleeve, different welding methods are used for the connecting pipe and the valve seat, and the connecting pipe and the sleeve, respectively, which can reduce the thermal influence of heat conduction on the inner components of the sleeve during welding.

[0055] In this solution, the valve seat 20 is made of aluminum alloy, and the connecting pipe 60B is made of stainless steel;

[0056] Before step S1, in some embodiments, Fig. 9 As shown, a mounting groove 21 is formed on the valve seat 20, and the connecting pipe 60 is inserted into the mounting groove 21, so that the outer wall of the connecting pipe 60B is interference-fitted with the inner wall of the valve seat 20, and another part of the connecting pipe 60B above the interference-fit position has a gap with the inner wall of the valve seat 20; the solder 80 is arranged on the outer periphery of the connecting pipe 60B, and induction heating is performed to melt the solder 80 to fill the gap to form the welding portion 13. In other embodiments, such as Figure 8 As described above, the valve seat 20 forms a first step portion 23, and a receiving cavity 201 is formed between the first step portion 23 and the connecting pipe 60B. The solder 80 is placed in the receiving cavity 201, and induction heating is performed to melt the solder 80 to fill the gap to form a welding portion 13. The fluidity of the aluminum solder is poor. A gap is provided between the connecting pipe 60B and the valve seat 20, which is beneficial to the flow path of the solder and improves the welding quality of the welding portion. An interference section 2422 is provided below the gap section 2421 to loosen the relative fixed portion of the connecting pipe 60B and the valve seat 20, ensure the relative position of the connecting pipe 60B and the valve seat 20, and ensure that the gap is relatively uniform, and the connecting pipe 60B is not offset. The valve seat is made of aluminum alloy, and the valve seat is formed by machining using a profile, or the valve seat is formed by stamping or forging combined with machining.

[0057] The inner part of the sleeve includes a nut assembly 30, and the nut assembly 30 includes a nut seat 31 and a fixing seat 32. Step S2 includes assembling the nut assembly 30: the fixing seat 32 forms an installation cavity 320, and the nut seat 31 is inserted into the installation cavity 320 and fixed. Specifically, the nut seat 31 and the fixing seat 32 are split structures, and the nut seat 31 and the fixing seat 32 are fixedly connected; the fixing seat 32 is formed by machining using a profile, or the fixing seat 32 is formed by stamping or forging combined with machining, and the fixing seat 32 includes a main body 321 and a flange 322. Along the axial direction of the throttle valve, the main body 321 is close to the valve seat 20 relative to the flange 322, and the outer diameter of the flange 322 is larger than the outer diameter of the main body 321. The fixing method of the main body 321 and the valve seat 20 is one of interference fit, threaded connection, interference fit combined with adhesive curing bonding, or threaded connection combined with adhesive curing bonding.

[0058] Furthermore, the nut seat 31 includes a nut body 312 and a connecting piece 313. The connecting piece 313 is an insert and is injection molded into an integral structure with the nut body 312. The connecting piece 313 is made of metal. Part of the connecting piece 313 is located at the periphery of the nut body 312, and the outer wall part of the connecting piece 313 is interference fit with the inner wall part of the fixing seat 32.

[0059] In other embodiments, the inner part of the sleeve includes a nut assembly 30, and the nut assembly 30 includes a nut seat 31 and a fixing seat 32. Step S2 includes assembling the nut assembly 30: the fixing seat 32 is an insert and the nut seat 31 is injection molded to form an integral structure; wherein the fixing seat 32 is made of metal. The fixing seat 32 is formed by machining a profile, or the fixing seat 32 is formed by stamping or forging combined with machining. The fixing seat 32 includes a main body 321 and a flange 322. Along the axial direction of the throttle valve, the main body 321 is closer to the valve seat 20 relative to the flange 322, and the outer diameter of the flange 322 is larger than the outer diameter of the main body 321. The fixing method of the main body 321 and the valve seat 20 is one of interference fit, threaded connection, interference fit combined with adhesive curing bonding, or threaded connection combined with adhesive curing bonding.

[0060] The inner parts of the sleeve include a valve core assembly 40, a nut assembly 30 and a rotor assembly 50, and step S2 includes assembling the valve core nut assembly: inserting the valve core assembly 40 into the nut assembly 30, so that the valve core assembly 40 and the nut assembly 30 are threadedly matched. Specifically, the valve core assembly 40 includes a valve core part 42 and a screw rod 41, the valve core part 42 is fixedly connected to the screw rod 41, the screw rod 41 has an external thread, the external thread is located on the outer peripheral wall of the screw rod 41, the nut seat 31 has an internal thread, and the screw rod 41 is threadedly matched with the nut seat 31. Insert the valve core nut assembly into the mounting groove 21 of the first assembly and fix it; wherein the fixed connection method is one of interference fit, or threaded connection, or interference fit combined with glue curing bonding, or threaded connection combined with glue curing bonding. Assemble the rotor assembly, and fix the rotor assembly 50 to the valve core assembly 40. It should be noted that the process of assembling the rotor assembly can be performed before the process of assembling the valve core nut assembly with the first assembly, that is, the rotor assembly is first fixed with the valve core nut assembly to form a second assembly, and the second assembly is inserted into the mounting groove 21 of the first assembly and fixedly connected, that is, the second assembly is fixedly connected with the first assembly to form a third assembly, or the process of assembling the rotor assembly can be performed after the process of assembling the valve core nut assembly with the first assembly, after the valve core nut assembly is fixed with the first assembly, that is, the valve core nut assembly is inserted into the mounting groove 21 of the first assembly and fixedly connected, and the rotor assembly is then fixed with the valve core assembly to form a third assembly.

[0061] Step S4 includes: sleeve the sleeve 60A on the outer circumference of the rotor assembly 50 so that the lower end of the sleeve 60A abuts against the upper end of the connecting pipe 60B and then is welded and fixed, and the inner wall of the sleeve 60A is interference fit with the flange portion 322 of the fixing seat 32.

[0062] In this solution, the throttle valve includes a valve seat 27, and the manufacturing method of the throttle valve includes assembling the valve seat 27, the valve seat 27 has a valve port 271, inserting the valve seat 27 into the mounting groove 21 of the valve seat 20 and fixing it. It can be understood that the first component includes the valve seat 27, that is, after the connecting pipe is fixed to the valve seat, the valve seat 27 is assembled with the valve seat 20, or the valve seat 27 is first fixed to the valve seat 20 and then fixed to the connecting pipe; of course, in some other embodiments, the valve seat 27 is assembled after step S4.

[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 in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for manufacturing a throttle valve, characterized in that: The throttle valve comprises a sleeve (60A), a connecting pipe (60B), a valve seat (20) and a sleeve inner component; along the axial direction of the throttle valve, the connecting pipe (60B) is closer to the valve seat (20) relative to the sleeve (60A); the connecting pipe (60B) and the valve seat (20) are made of different metal materials; the manufacturing method comprises the following steps: S1. Assembling the valve seat (20) and the connecting pipe (60B): the valve seat (20) and the connecting pipe (60B) are fixed by induction brazing to form at least part of the first assembly; S2. Assembling the inner parts of the casing to form at least a portion of the second assembly; S3. Assembling the first component and the second component to form at least part of a third component; S4. Assemble the third component and the sleeve (60A): place the sleeve (60A) on the outer periphery of the second component, and fix the sleeve (60A) and the connecting pipe (60B) by laser welding.

2. The method for manufacturing a throttle valve according to claim 1, characterized in that: The valve seat (20) is made of aluminum alloy, and the connecting pipe (60B) is made of stainless steel; Before step S1, a mounting groove (21) is formed on the valve seat (20), and the connecting pipe (60B) is inserted into the mounting groove (21), so that the outer wall of the connecting pipe (60B) and the inner wall of the valve seat (20) are interference-fitted, and another part of the connecting pipe (60B) above the interference-fit position has a gap with the inner wall of the valve seat (20); The solder (80) is arranged on the outer periphery of the connecting pipe (60B), and induction heating is performed to melt the solder (80) and fill the gap to form a welding portion (13); or the valve seat (20) forms a first step portion (23), and a receiving cavity (201) is formed between the first step portion (23) and the connecting pipe (60B), and the solder (80) is placed in the receiving cavity (201), and induction heating is performed to melt the solder (80) and fill the gap to form a welding portion (13).

3. The method for manufacturing a throttle valve according to claim 1 or 2, characterized in that: The inner part of the sleeve includes a nut assembly (30), and the nut assembly (30) includes a nut seat (31) and a fixing seat (32). The step S2 includes assembling the nut assembly (30): the fixing seat (32) forms an installation cavity (320), and the nut seat (31) is inserted into the installation cavity (320) and fixed.

4. The method for manufacturing a throttle valve according to claim 3, characterized in that: The nut seat (31) includes a nut body (312) and a connecting piece (313), and the "assembled nut assembly (30)" also includes assembling the nut seat (31): the connecting piece (313) is injection-molded as an insert with the nut body (312) to form an integral structure; wherein the connecting piece (313) is made of metal.

5. The method for manufacturing a throttle valve according to claim 1 or 2, characterized in that: The inner part of the sleeve comprises a nut assembly (30), and the nut assembly (30) comprises a nut seat (31) and a fixing seat (32). The step S2 comprises assembling the nut assembly (30): the fixing seat (32) is used as an insert and is injection-molded with the nut seat (31) to form an integral structure; wherein the fixing seat (32) is made of metal.

6. The method for manufacturing a throttle valve according to claim 3 or 5, characterized in that: The inner part of the sleeve includes a valve core assembly (40) and a nut assembly (30), and the step S2 includes assembling the valve core nut assembly: inserting the valve core assembly (40) into the nut assembly (30) so that the valve core assembly (40) and the nut assembly (30) are threadedly matched.

7. The method for manufacturing a throttle valve according to claim 6, characterized in that: The step S3 comprises: inserting the valve core nut assembly into the mounting groove (21) of the first assembly and fixing the assembly in place; The fixed connection method is one of interference fit, threaded connection, interference fit combined with adhesive curing bonding, or threaded connection combined with adhesive curing bonding.

8. The method for manufacturing a throttle valve according to claim 7, characterized in that: The inner part of the sleeve includes a rotor assembly (50), and the step S3 includes assembling the rotor assembly (50): the rotor assembly (50) is fixedly connected to the valve core assembly (40).

9. The method for manufacturing a throttle valve according to claim 6, characterized in that: The inner part of the sleeve includes a rotor assembly (50), and the step S2 includes assembling the rotor assembly (50): the rotor assembly (50) is fixedly connected to the valve core nut assembly 40 to form a second assembly; and the second assembly is inserted into the installation groove (21) of the first assembly and fixedly connected.

10. The method for manufacturing a throttle valve according to claim 8 or 9, characterized in that: The step S4 comprises: sleeve-mounting the sleeve (60A) on the outer periphery of the rotor assembly (50) so that the lower end of the sleeve (60A) abuts against the upper end of the connecting pipe (60B) and then is welded and fixed, and the inner wall of the sleeve (60A) is interference-fitted with the flange (322) of the fixing seat (32).

11. The method for manufacturing a throttle valve according to any one of claims 1 to 10, characterized in that: The throttle valve comprises a valve seat (27). The manufacturing method of the throttle valve comprises assembling the valve seat (27), wherein the valve seat (27) has a valve port (271), inserting the valve seat (27) into the mounting groove (21) of the valve seat (20) and fixing the valve seat (27) in a fixed connection.

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