Valve device

Abstract

The valve device comprises a rotor assembly, a nut assembly and a valve element assembly, the rotor assembly is in fixed or limited connection with the valve element assembly, and the valve element assembly is in transmission connection with the nut assembly; the valve device comprises a valve seat, a welding part and a sleeve, the valve seat and the sleeve are fixedly connected through induction brazing, at least part of the sleeve is located in the mounting groove, the mounting part comprises a first wall part and a second wall part, in the axial direction of the valve seat, the second wall part is close to a port of the sleeve relative to the first wall part, and in the radial direction of the valve seat, the first wall part is far away from the axis of the valve seat relative to the second wall part. Part of the welding part is located between the sleeve and the second wall part, the welding part is fixedly welded to the second wall part, the welding part is fixedly welded to the sleeve, the second wall part and the corresponding sleeve are made of different materials, and the size of the welding part is smaller than or equal to the distance between the first wall part and the sleeve in the radial direction of the valve seat. And the area of the welding part of the valve seat and the sleeve is increased, so that the welding quality is improved.

Description

Technical Field

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

[0002] In the related art, in order to save manufacturing costs, dissimilar metals are used for the sleeve and the valve seat. However, dissimilar metals are difficult to weld due to their large differences in physical properties, especially for welding thin-walled parts of the sleeve. Therefore, technical personnel in this field are in urgent need of solving the above technical problems. Summary of the invention

[0003] The purpose of the present application is to provide a valve device, which is beneficial to improving the welding quality of the sleeve and the valve seat.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: the valve device comprises a rotor assembly, a nut assembly and a valve core assembly, the rotor assembly is fixedly or positionally connected to the valve core assembly, and the valve core assembly is drivingly connected to the nut assembly; the valve device comprises a valve seat, a welding portion and a sleeve, at least part of the rotor assembly and at least part of the nut assembly are located in the inner cavity of the sleeve, the valve seat and the sleeve are fixedly connected by induction brazing, the valve seat comprises a mounting portion, the mounting portion has a mounting groove, at least part of the sleeve is located in the mounting groove, the mounting portion comprises a first wall portion and a second wall portion, along the axial direction of the valve seat, the second wall portion is close to the port of the sleeve relative to the first wall portion, along the radial direction of the valve seat, the first wall portion is far away from the axis of the valve seat relative to the second wall portion, part of the welding portion is located between the sleeve and the second wall portion, the welding portion welds and fixes the second wall portion, the welding portion welds and fixes the sleeve, and the second wall portion and the corresponding sleeve are made of different materials, and along the radial direction of the valve seat, the size of the welding portion is less than or equal to the distance between the first wall portion and the sleeve.

[0005] In one embodiment provided by the present application, the valve device includes a valve seat, a welding portion and a sleeve, and the valve seat and the sleeve are fixedly connected by induction brazing. The induction brazing is used, and the heating is uniform and the heating speed is fast, which can reduce welding deformation; the valve seat includes a mounting portion, and the mounting portion has a mounting groove, at least part of the sleeve is located in the mounting groove, and part of the welding portion is located between the sleeve and the second wall portion, and along the radial direction of the sleeve, the size of the welding portion is less than or equal to the distance between the first wall portion and the sleeve. It can be understood that before the sleeve and the valve seat are welded, the sleeve and the first wall portion are gap-matched, and the solder fills the gap between the sleeve and the first wall portion to form a welding portion, thereby increasing the area of ​​the welding portion between the valve seat and the sleeve, thereby improving the quality of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a schematic diagram of the three-dimensional structure of a specific embodiment of the valve device;

[0007] Figure 2 is a cross-sectional schematic diagram of a valve device;

[0008] Figure 3 is a schematic structural diagram of a valve component of a valve device;

[0009] Figure 4 An exploded view of a partial structure of a valve component of a valve device;

[0010] Figure 5 It is a connection diagram of the nut assembly, the fixing part and the valve seat of the valve device;

[0011] Figure 6 for Figure 5 A partial enlarged view of middle A;

[0012] Figure 7 is a schematic diagram of the structure of the valve seat of the valve device;

[0013] Figure 8 It is a schematic diagram of the connection between the valve seat and the sleeve of the valve device;

[0014] Fig. 9 for Figure 8 A partial enlarged view of B in the middle;

[0015] Fig.10 for Figure 8 Schematic diagram of the welding part after the middle sleeve and the valve seat are welded;

[0016] Fig.11 A schematic diagram of another embodiment of the connection between a valve seat and a sleeve of a valve device;

[0017] Fig.12 for Fig.11 Schematic diagram of the welding part after the middle sleeve and the valve seat are welded;

[0018] Fig.13 Another schematic diagram of the structure of the valve seat of the valve device.

[0019] The reference numerals in the figures are described as follows:

[0020] 10. stator component; 11. coil assembly; 12. injection molding part; 13. solder; 14. welding part;

[0021] 200, valve component; 20, valve seat; 201, mounting portion; 203, overlapping portion; 21, mounting groove; 22, valve port; 23, first step portion; 231, first bottom wall portion; 232, first side wall portion; 2321, guide portion; 2322, transition portion; 2323, matching portion; 24, second step portion; 241, second bottom wall portion; 242, second wall portion; 2421, first sub-wall portion; 2422, second sub-wall portion; 25, accommodating groove; 251, step portion; 2511, first wall portion; 2512, third bottom wall portion;

[0022] 26, rotor assembly; 27, valve port seat; 271, valve port; 272, side hole;

[0023] 30. nut assembly; 31. main body; 311. mounting hole; 32. connecting part;

[0024] 40. valve core assembly; 41. screw rod; 42. valve core;

[0025] 50. fixing member; 52. mounting cavity;

[0026] 60. Casing;

[0027] 70. First sealing member; 71. Second sealing member; 72. Third sealing member. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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-Figure 13, 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.

[0031] The valve component 200 includes a valve seat 20, a nut assembly 30, a sleeve, a rotor assembly 26 and a valve core assembly 40. The stator component 10 is located on the outside of the sleeve 60, the rotor assembly 26 is located on the inside of the sleeve 60, and the valve core assembly 40 is connected to the rotor assembly 26. When a predetermined current is passed through the stator component 10, an excitation magnetic field can be generated to drive the rotor assembly 26 to rotate. The rotor assembly 26 drives the valve core assembly 40 to rotate. The valve core assembly 40 is threadedly matched with the nut assembly 30 to convert the rotation of the rotor assembly 26 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 part 41 and a valve core part 42. The screw part 41 and the valve core part 42 are separate structures and connected. It can be understood that the connection method includes fixed connection, limited connection or transmission connection. The screw part 41 is formed with an external thread, and the nut assembly 30 is formed with an internal thread that matches therewith. The screw part 41 and the nut assembly 30 are threadedly matched to convert the rotation of the rotor assembly 26 into the axial movement of the screw part 41 relative to the nut assembly 30. Of course, in other embodiments, the screw part 41 and the valve core part 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 part 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, so as to achieve the flow regulation of the refrigerant. For the convenience of description, the upper and lower directions are defined as the upper and lower directions of the specification. Figure 2 The up and down directions in the accompanying drawings only indicate relative positions and do not represent the actual status of the product when in use.

[0032] Combination Figure 3-Figure 13The valve device includes a rotor assembly 26, a nut assembly 30 and a valve core assembly 40. The rotor assembly 26 is fixedly or positionally connected to the valve core assembly 40, and the valve core assembly 40 is drivingly connected to the nut assembly 30. The valve device includes a valve seat 20, a welding portion 14 and a sleeve 60. At least part of the rotor assembly 26 and at least part of the nut assembly 30 are located in the inner cavity of the sleeve 60. The valve seat 20 and the sleeve 60 are fixedly connected by induction brazing. The valve seat 20 includes a mounting portion 201. The mounting portion 201 has a mounting groove 21. At least part of the sleeve 60 is located in the mounting groove 21. The mounting portion 201 includes a first wall portion 2511 and The second wall portion 242, along the axial direction of the sleeve 60, the first wall portion 2511 is far away from the end of the sleeve 60 relative to the second wall portion 242, and along the radial direction of the sleeve 60, the first wall portion 2511 is far away from the axis of the valve seat 20 relative to the second wall portion 242. Part of the welding portion 14 is located between the sleeve 60 and the second wall portion 242, the welding portion 14 welds and fixes the second wall portion 242, the welding portion 14 welds and fixes the sleeve 60, and the second wall portion 242 and the corresponding sleeve 60 are made of different materials, and along the radial direction of the valve seat 20, the size of the welding portion 14 is less than or equal to the distance between the second wall portion 242 and the sleeve 60.

[0033] In the present application, the valve seat 20 and the sleeve 60 are fixedly connected by induction brazing. Induction brazing is adopted, and the heating is uniform and the heating speed is fast, which can reduce welding deformation. The valve seat 20 includes a mounting portion 201, and the mounting portion 201 has a mounting groove 21. At least part of the sleeve 60 is located in the mounting groove 21. After the sleeve 60 and the valve seat 20 are fixedly connected by induction brazing, part of the welding portion 14 is located between the sleeve 60 and the second wall portion 242. Along the radial direction of the valve seat 20, the size of the welding portion 14 is less than or equal to the distance between the second wall portion 242 and the sleeve 60. It can be understood that before the sleeve 60 and the valve seat 20 are welded, the sleeve 60 and the second wall portion 242 are gap-matched, and the solder 13 fills the gap between the sleeve 60 and the second wall portion 242 to form the welding portion 14. The setting of a reasonable gap value can reduce the generation of welding defects such as incomplete penetration, thereby increasing the area of ​​the welding portion 14 between the valve seat 20 and the sleeve 60, thereby improving the quality of welding.

[0034] Combination Figure 2-Figure 10 In a first specific embodiment of the present application, the valve device includes a nut assembly 30, a sleeve 60, a fixing member 50 and a valve seat 20, at least part of the fixing member 50 is located on the inner side of the sleeve 60, along the axial direction of the valve device, at least part of the nut assembly 30 is located on one side of the fixing member 50, at least part of the valve seat 20 is located on the other side of the fixing member 50, the fixing member 50 includes an installation cavity 52, at least part of the nut assembly 30 is located in the installation cavity 52, and the nut assembly 30 is fixedly or limitably connected to the fixing member 50; the valve seat 20 includes a mounting groove 21, at least part of the valve seat 20 is located in the mounting groove 21, and the fixing member 50 is fixedly or limitably connected to the valve seat 20.

[0035] The nut assembly 30 includes a main body 31 and a connecting portion 32. The connecting portion 32 is fixedly connected to the main body 31. The fixing method includes injection molding, interference fit, gluing, or interference fit combined with gluing. At least part of the connecting portion 32 is located at the periphery of the main body 31, that is, at least part of the connecting portion 32 protrudes from the periphery of the main body 31. In this embodiment, the connecting portion 32 and the main body 31 are an integral structure, that is, the connecting portion 32 is an insert and is injection molded into an integral structure with the main body. The main body 31 includes a mounting hole 311. The mounting hole 311 passes through the upper and lower ends of the main body 31 along the axial direction of the valve device. At least part of the screw portion 41 of the valve core assembly 40 is located in the mounting hole 311, that is, one end of the screw portion 41 passes through the mounting hole 311 of the main body 31 and is fixedly connected to the rotor assembly 26. The screw portion 41 is threadedly connected to the nut assembly 30. Specifically, the screw portion 41 is formed with an external thread, and the nut assembly 30 is formed with an internal thread matching therewith, that is, the internal thread is formed on the inner wall of the main body portion 31, and the screw portion 41 is threadedly matched with the main body portion 31 to convert the rotation of the rotor assembly 26 into the axial movement of the screw portion 41 relative to the nut assembly 30.

[0036] In the present application, the rotational movement of the rotor assembly 26 is replaced by the axial movement of the screw part 41 relative to the nut assembly 30, and the nut assembly 30 is fixed relative to the valve seat 20. The fixing member 50 is generally a hollow cylindrical structure, and the fixing member 50 includes a mounting cavity 52, at least part of the nut assembly 30 is located in the mounting cavity 52, the connecting portion 32 of the nut assembly 30 is interference fit with the inner wall portion of the fixing member 50, and the fixing member 50 is fixedly connected to the valve seat 20.

[0037] In some embodiments, Fig.13 As shown, the valve seat includes a lap portion 203, which is located on the inner side of the sleeve 60. The connecting portion 32 is welded and fixed to the lap portion 203 along the axial direction of the valve device. Specifically, in this embodiment, the lap portion and the valve seat are an integrated structure, the valve seat is formed by machining of a profile, or the valve seat is formed by forging, extrusion and other processes, and the nut assembly is fixedly connected to the lap portion of the valve seat, replacing the fixing part, and the structure is relatively simple. Figure 7 As shown, the valve seat 20 is generally in a hollow cylindrical shape, and the valve seat 20 is made of aluminum alloy. The valve seat 20 includes a mounting groove 21, and at least part of the fixing member 50 is located in the mounting groove 21. The valve seat 20 includes a first step portion 23, that is, the first step portion 23 is located in the wall portion forming the mounting groove 21, and at least part of the lower end portion of the fixing member 50 abuts against the first step portion 23, and the fixing member 50 and the valve seat 20 are interference fit. Specifically, the first step portion 23 includes a first bottom wall portion 231 and a first side wall portion 232, and the first bottom wall portion 231 abuts against the lower end portion of the fixing member 50, thereby limiting the fixing member 50 from moving relative to the valve seat 20 in the axial direction of the valve device toward the valve port 271; as shown in FIG. Figure 6As shown, the first side wall portion 232 includes a guide portion 2321, a transition portion 2322 and a matching portion 2323. Along the axial direction of the valve device, the transition portion 2322 is located between the guide portion 2321 and the matching portion 2323. The inner diameter of the transition portion 2322 is larger than the inner diameter of the matching portion 2323. The transition portion 2322 is clearance-matched with the fixing member 50, and the matching portion 2323 is interference-matched with the fixing member 50. Specifically, the guide portion 2321 and the transition portion 2322 form a certain angle, and the angle is controlled between 30-60 degrees; correspondingly, the lower end of the fixing member 50 has a guide structure, and the guide portion 2321 of the valve seat 20 is matched with the guide structure of the fixing member 50, which is convenient for assembly. Along the axial direction of the valve device, one end of the fixing member 50 is in interference fit with the nut assembly 30, and the other end of the fixing member 50 is in interference fit with the valve seat 20. Relatively speaking, the nut assembly 30 is fixed relative to the valve seat 20. Compared with the known technology, the connecting part 32 is made of stainless steel, and the valve seat 20 is made of stainless steel. The connecting part 32 and the valve seat 20 are fixed by welding. This solution omits the welding step, and the connecting part 32 is made of plastic, and the valve seat 20 is made of aluminum alloy, which relatively reduces the weight of the valve device and reduces the cost.

[0038] In this embodiment, combined with Figure 7-10The sleeve 60 is fixedly connected to the valve seat 20 by induction brazing. Specifically, the valve seat includes a mounting portion 201, and a mounting groove 21 is located at the mounting portion 201. Along the axial direction of the valve seat 20, the mounting groove 21 passes through the upper and lower ends of the valve seat 20, and at least part of the sleeve 60 is located in the mounting groove 21. The mounting portion 201 includes a first wall portion 2511 and a second wall portion 242. Along the axial direction of the sleeve 60, the second wall portion 242 is close to the end of the sleeve 60 relative to the first wall portion 2511. It can be understood that the valve seat 20 includes a second step portion 24. Along the axial direction of the valve device, the second step portion 24 is close to the opening away from the sleeve 60 relative to the first step portion 23. The second step portion 24 includes a second bottom wall portion 241 and a second wall portion 242. The distance from the second wall portion 242 to the axis of the valve device is L1, and the distance from the first side wall portion 232 to the axis of the valve device is L2. Then L1 is greater than L2. The lower end portion of the sleeve 60 is against the second bottom wall portion 241 of the second step portion 24, and at least part of the outer wall portion of the sleeve 60 is against the second wall portion 242. In the present application, the sleeve 60 and the valve seat 20 are fixed by induction brazing. Specifically, the solder 13 is arranged on the outer wall of the sleeve 60 and is located at the upper end of the valve seat 20. The upper end of the valve seat 20 supports the solder 13. The second wall portion 242 of the second step portion 24 includes a first sub-wall portion 2421 and a second sub-wall portion 2422, and along the axial direction of the valve device, the first sub-wall portion 2421 is away from the port of the sleeve 60 relative to the second sub-wall portion 2422, wherein the first sub-wall portion 2421 has a clearance fit with the sleeve 60, and the second sub-wall portion 2422 has an interference fit with the sleeve 60. Before the sleeve 60 is welded to the valve seat, the distance from the first sub-wall portion 2421 of the second wall portion 242 to the sleeve 60 is defined as K, then 0<K≤0.3mm, and the gap value K is adjusted appropriately according to the difference in thermal expansion coefficients of different materials as required. Define the length of the first sub-wall portion 2421 along the axial direction of the valve device as L, define the thickness of the sleeve 60 as T, then L = 2T-6T. During assembly, the sleeve 60 and the valve seat 20 are fixed by interference fit, and then welding is performed. The solder 13 is located at the upper end of the valve seat 20, and the solder 13 is sleeved on the sleeve 60. During welding, the induction heating solder melts and fills the gap between the first sub-wall portion 2421 and the sleeve 60 to form a welding portion 14, that is, part of the welding portion 14 is located between the sleeve 60 and the first sub-wall portion 2421, and part of the welding portion is welded to fix the second wall portion 242, and the welding portion 14 is welded to fix the sleeve 60.The sleeve 60 and the first sub-wall portion 2421 of the valve seat 20 are matched with a small gap, and the gap is controlled at 0-0.3mm. Due to capillary action and the gravity of the welding liquid, the welding liquid flows into the gap between the sleeve 60 and the valve seat 20 to fill the gap, and then cools and solidifies. That is, the length of the first sub-wall portion 2421 is the length of the weld. The length of the first sub-wall portion 2421 is controlled to be 2 to 6 times the thickness of the sleeve 60. When the weld is too short, the connection strength between the valve seat 20 and the sleeve 60 is insufficient. If 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.

[0039] In some embodiments, in order to achieve better welding effect, such as Figure 7 and Figure 8 As shown, the valve seat 20 includes a stepped portion 251, and the stepped portion 251 is located at the end of the valve seat 20. The side wall portion of the stepped portion 251 forms a first wall portion 2511, and a portion of the welding portion 14 fixes the first wall portion 2511 and the sleeve 60. Specifically, the valve device includes a receiving groove 25, and the receiving groove 25 is used to receive the solder 13 and limit the movement of the solder 13. Specifically, the valve seat 20 includes a stepped portion 251, and the stepped portion 251 is close to the opening of the valve seat 20 relative to the second step portion 24. The stepped portion 251 includes a first wall portion 2511 and a third bottom wall portion 2512. The first wall portion 2511 is arranged opposite to the sleeve 60, and the third bottom wall portion 2512 is arranged opposite to the opening of the valve seat 20. The wall forming the receiving groove 25 includes the wall forming the stepped portion 251 and at least a portion of the outer wall of the sleeve 60. As shown Fig.10 As shown, after the sleeve 60 and the valve seat are fixed by induction brazing, part of the welding portion 14 is located between the first wall portion 2511 and the sleeve 60, that is, part of the welding portion 14 fixes the first wall portion 2511, the third bottom wall portion 2512 and the sleeve 60 of the valve seat. The width of the receiving groove 25 is defined as W, that is, the radial distance from the first wall portion 2511 of the step portion 251 to the outer wall of the sleeve 60 is W, the depth of the receiving groove 25 is defined as H, that is, the axial distance from the opening of the receiving groove 25 to the third bottom wall portion 2512 of the step portion 251 is H, and the diameter of the solder 13 is D, then W>D, H<D, to ensure that the solder 13 can fill the receiving groove 25. Of course, in other embodiments, the cross-section of the solder 13 is not limited to a circle, and can also be a square, elongated, polygonal or other structure; in other embodiments, a wire feeding mechanism can also be used to fill the solder into the receiving groove 25. In the present application, solder 13 brazing is adopted to carry out mass production and improve the production rhythm.

[0040] During the production and assembly process of the valve device, after the rotor assembly 26, the nut assembly 30, and the valve core assembly 40 are assembled, the sleeve 60 is welded and fixed to the valve seat 20. Heat is generated during the fixing process of the sleeve 60 and the valve seat 20. The heat is transferred to the nut assembly 30 and the rotor assembly 26 inside the sleeve 60 through the sleeve 60. The performance of the nut assembly 30 and the rotor assembly 26 will be affected by the heat. In order to solve the above problem, a gap is set between the sleeve 60 and the fixing part 50. The setting of the gap can reduce the heat transfer. Specifically, the distance from the second wall portion 242 of the second step portion 24 to the axis of the valve device is L1, the distance from the first side wall portion 232 of the first step portion 23 to the axis of the valve device is L2, the second wall portion 242 abuts against the outer wall of the sleeve 60, and the first side wall portion 232 abuts against the outer wall portion of the fixing member 50, that is, by adjusting the radial distance between the first side wall portion 232 and the second wall portion 242, the gap setting between the sleeve 60 and the fixing member 50 can be ensured. In this embodiment, in order to reduce the influence of heat on the nut assembly 30 and the rotor assembly 26, L1=L2+(2~4)T.

[0041] The second specific embodiment of the present application, as shown in the figure, is different from the first specific embodiment in that the mounting portion 201 includes a first wall portion 2511 and a second wall portion 242. Along the axial direction of the sleeve 60, the second wall portion 242 is close to the end of the sleeve 60 relative to the first wall portion 2511, and along the radial direction of the sleeve 60, the first wall portion 2511 is far away from the axis of the valve seat 20 relative to the second wall portion 242. The first wall portion 2511 and the second wall portion 242 are arranged at an angle α, and the angle α is 30° to 70°. The partial welding portion 14 fixes the first wall portion 2511 and the sleeve 60. Specifically, the second wall portion 242 includes a first sub-wall portion 2421 and a second sub-wall portion 2422. Along the axial direction of the valve device, the first sub-wall portion 2421 is close to the end of the sleeve 60 relative to the second sub-wall portion 2422, and the second sub-wall portion 2422 is interference fit with the sleeve 60. During welding, the induction heating solder melts and fills the gap between the first sub-wall portion and the sleeve 60 to form a welding portion 14, that is, after the sleeve 60 and the valve seat are fixedly connected by induction brazing, part of the welding portion 14 is located between the first wall portion 2511 and the sleeve 60, and part of the welding portion 14 is located between the second wall portion 242 and the sleeve 60. Part of the welding portion 14 fixes the first wall portion 2511 and the sleeve 60, and the size of the welding portion 14 is less than or equal to the distance between the first wall portion 2511 and the sleeve 60; part of the welding portion 14 fixes the second wall portion 242 and the sleeve 60, and the size of the welding portion is less than the distance between the first wall portion 2511 and the sleeve 60.

[0042] Before the sleeve 60 is welded to the valve seat, the distance from the first sub-wall portion 2421 of the second wall portion 242 to the sleeve 60 is defined as K, then 0<K≤0.3mm, and the gap value K is adjusted appropriately according to the difference in thermal expansion coefficients of different materials. The length of the first sub-wall portion 2421 along the axial direction of the valve device is defined as L, and the thickness of the sleeve 60 is defined as T, then L=2T-6T. During assembly, the sleeve 60 and the valve seat 20 are fixed by interference fit before welding. The solder 13 is located at the upper end of the valve seat 20, and the solder 13 is sleeved on the sleeve 60. During welding, the induction heating solder melts and fills the gap between the first sub-wall portion and the sleeve 60 to form a welding portion, that is, part of the welding portion is located between the sleeve 60 and the first sub-wall portion, and part of the welding portion is welded to fix the second wall portion, and the welding portion is welded to fix the sleeve 60. The sleeve 60 and the first sub-wall portion 2421 of the valve seat 20 are matched with a small gap, and the gap is controlled at 0-0.3mm. Due to capillary action and the gravity of the welding liquid, the welding liquid flows into the gap between the sleeve 60 and the valve seat 20 to fill the gap, and then cools and solidifies. That is, the length of the first sub-wall portion 2421 is the length of the weld. The length of the first sub-wall portion 2421 is controlled to be 2 to 6 times the thickness of the sleeve 60. When the weld is too short, the connection strength between the valve seat 20 and the sleeve 60 is insufficient. If 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.

[0043] In the first specific implementation and the second specific embodiment, the valve device further includes a valve seat 27, the valve seat 27 is roughly hollow 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, and 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, and the outer wall of the upper end of the valve seat 27 abuts against the wall forming the mounting hole 311, that is, an 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 the side hole 272 is located between the valve port 271 and the lower end of the valve seat 20 along the axial direction of the valve device.

[0044] The valve device also includes a first seal 70, a second seal 71 and a third seal, wherein the first seal 70 is located in the groove at the lower end of the stator component 10, the left and right ends of the first seal 70 are respectively against the inner wall of the groove and the outer wall of the sleeve 60, the lower end of the first seal 70 is against the welding part of the sleeve 60 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. Along the axial direction of the valve device, the second seal 71 and the third seal 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 working medium from leaking from the valve seat 20 and the valve body to the outside of the valve device. The third seal is pressed between the valve seat 27 and the valve body to limit the working medium from leaking from the valve seat 27 and the valve body to the outside of the valve device. The structures that can be used in combination by deduction in the various embodiments of the present application are within the scope of protection of the present application.

[0045] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A valve device, characterized in that: The valve device comprises a rotor assembly (26), a nut assembly (30) and a valve core assembly (40); the rotor assembly (26) is fixedly or positionally connected to the valve core assembly (40); the valve core assembly (40) is drivingly connected to the nut assembly (30); the valve device comprises a valve seat (20), a welding portion (14) and a sleeve (60); at least part of the rotor assembly (26) and at least part of the nut assembly (30) are located in the inner cavity of the sleeve (60); the valve seat (20) and the sleeve (60) are fixedly connected by induction brazing; the valve seat (20) comprises a mounting portion (201); the mounting portion (201) has a mounting groove (21); at least part of the sleeve (60) is located in the mounting groove (21); the mounting portion (201) comprises a first wall portion (2511) and a second wall portion (2412). 2), along the axial direction of the valve seat (20), the second wall portion (242) is close to the port of the sleeve (60) relative to the first wall portion (2511), and along the radial direction of the valve seat (20), the first wall portion (2511) is far away from the axis of the valve seat (20) relative to the second wall portion (242), part of the welding portion (14) is located between the sleeve (60) and the second wall portion (242), the welding portion (14) is welded to fix the second wall portion (242), the welding portion (14) is welded to fix the sleeve (60), and the second wall portion (242) and the corresponding sleeve (60) are made of different materials, and along the radial direction of the valve seat (20), the size of the welding portion (14) is less than or equal to the distance between the first wall portion (2511) and the sleeve (60).

2. The valve device according to claim 1, characterized in that The second wall portion (242) includes a first sub-wall portion (2421) and a second sub-wall portion (2422). Along the axial direction of the valve device, the first sub-wall portion (2421) is farther away from the port of the sleeve (60) relative to the second sub-wall portion (2422), and the second sub-wall portion (2422) is interference fit with the sleeve (60).

3. The valve device according to claim 1 or 2, characterized in that: Part of the welding portion (14) is located between the sleeve (60) and the first sub-wall portion (2421), and part of the welding portion (14) is located between the first wall portion (2511) and the sleeve (60).

4. The valve device according to claim 3, characterized in that The first wall portion (2511) and the second wall portion (242) are arranged at an angle α, wherein the angle α is 30° to 70°, and a portion of the welding portion (14) fixes the first wall portion (2511) and the sleeve (60).

5. The valve device according to claim 3, characterized in that The valve seat (20) includes a stepped portion (251), the stepped portion (251) is located at the end of the valve seat (20), the side wall portion of the stepped portion (251) forms the first wall portion (2511), and part of the welding portion (14) fixes the first wall portion (2511) and the sleeve (60).

6. The valve device according to claim 5, characterized in that Along the radial direction of the valve seat (20), the thickness of the welding portion (14) between the second wall portion (242) and the sleeve (60) is K, and 0<K≤0.3 mm.

7. The valve device according to claim 6, characterized in that The length of the first sub-wall portion (2421) along the axial direction of the valve device is defined as L, and the thickness of the sleeve (60) is defined as T, then L=2T~6T.

8. The valve device according to any one of claims 1 to 7, characterized in that: The valve device comprises a nut assembly (30), wherein the nut assembly (30) is fixedly connected to the valve seat (20); the nut assembly (30) comprises a main body (31) and a connecting portion (32), wherein the connecting portion (32) is located on the outer periphery of the main body (31), and the connecting portion (32) is fixedly connected or limit-connected to the valve seat (20).

9. The valve device according to claim 8, characterized in that The valve seat (20) comprises a lap portion (203), the lap portion (203) is located on the inner side of the sleeve (60), and along the axial direction of the valve device, the connecting portion (32) is fixed to the lap portion (203) by welding.

10. The valve device according to claim 9, characterized in that The valve device comprises a fixing member (50), a part of the fixing member (50) is located in the mounting groove (21), the fixing member (50) is fixedly or position-limitingly connected to the valve seat (20); the fixing member (50) is fixedly or position-limitingly connected to the nut assembly (30).

11. The valve device according to any one of claims 1 to 10, characterized in that: The valve seat (20) is made of aluminum, and the sleeve (60) is made of stainless steel.

Images