Valve device

Abstract

The valve device comprises a nut assembly, a sleeve, a fixing piece and a valve seat, at least part of the fixing piece is located in an inner cavity of the sleeve, in the axial direction of the valve device, part of the nut assembly is located on one side of the fixing piece, and part of the valve seat is located on the other opposite side of the fixing piece; the fixing piece and the nut assembly are fixed in a non-welding mode. The valve seat comprises a mounting groove, at least part of the fixing piece is located in the mounting groove, the fixing piece is fixedly connected with the valve seat, and damage of heat transfer to parts in the sleeve is reduced.

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 related technologies, such as Fig.15 As shown, the valve device includes a nut assembly 030 and a valve seat 020. The nut assembly 030 has a connecting plate 032. The connecting plate and the valve seat are both made of stainless steel. The nut assembly is fixed to the valve seat by welding the connecting plate. This arrangement requires an additional welding process. The heat generated when the connecting plate and the valve seat are welded affects the components in the sleeve (rotor assembly, valve core assembly). Therefore, those skilled in the art 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 that is conducive to improving heat conduction when the nut assembly is connected to the valve seat. To achieve the above purpose, the present application adopts the following technical solutions:

[0004] A valve device comprises a nut assembly, a sleeve, a fixing member and a valve seat, wherein at least part of the fixing member is located in the inner cavity of the sleeve, and along the axial direction of the valve device, part of the nut assembly is located on one side of the fixing member, and part of the valve seat is located on the other side of the fixing member; the fixing member is fixed to the nut assembly without welding; the valve seat comprises a mounting groove, at least part of the fixing member is located in the mounting groove, and the fixing member is fixedly connected to the valve seat.

[0005] In an embodiment provided in the present application, the valve device includes a fixing part and a nut assembly. The fixing part and the nut assembly are fixed without welding, and the fixing part is fixedly connected to the valve seat. Compared with the method of fixing the valve seat and the nut assembly by welding in the related art, it is beneficial to reduce the damage of heat transfer to the internal components of the sleeve. 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 A schematic diagram of the connection between a nut assembly, a fixing member, and a valve seat in another embodiment of the valve device;

[0013] Figure 8 is a schematic diagram of the structure of the fixing parts of the valve device;

[0014] Fig. 9 for Figure 8 A cross-sectional view of a fixing member;

[0015] Fig.10 is a schematic diagram of the structure of the valve seat of the valve device;

[0016] Fig.11 It is a connection diagram of the valve seat and sleeve of the valve device;

[0017] Fig.12 for Fig.11 A partial enlarged view of B in the middle;

[0018] Fig.13 It is another connection schematic diagram of the nut assembly and the fixing member of the valve device;

[0019] Fig.14 A schematic diagram of another connection of a sleeve and a fixing member of a valve device;

[0020] Fig.15 It is a schematic diagram of the structure of a valve device in the known technology.

[0021] The reference numerals in the figures are described as follows:

[0022] 10. stator component; 11. coil assembly; 12. injection molding part; 13. solder;

[0023] 200, valve component; 20, valve seat; 21, mounting groove; 22, valve port; 23, second step portion; 231, first wall portion; 232, second wall portion; 2321, guide portion; 2322, transition portion; 2323, matching portion; 24, third step portion; 241, third wall portion; 242, fourth wall portion; 2421, gap section; 2422, interference section; 25, accommodating groove; 251, step portion; 2512, bottom portion; 2511, side portion;

[0024] 26, rotor assembly; 27, valve port seat; 271, valve port; 272, side hole;

[0025] 30. nut assembly; 31. main body; 311. mounting hole; 32. connecting part;

[0026] 40. valve core assembly; 41. screw rod; 42. valve core;

[0027] 50, fixing member; 51, first step portion; 511, first side wall portion; 512, second side wall portion; 52, mounting cavity; 53, crimping portion; 54, first section; 55, second section;

[0028] 60. sleeve; 61. first connecting section; 62. second connecting section;

[0029] 70. First sealing member; 71. Second sealing member; 72. Third sealing member. 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-Figure 14 , 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 2-Figure 3The 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, the rotor assembly 26 is located in the inner cavity of the sleeve, and the valve core assembly 40 is connected to the rotor assembly 26. A predetermined current is passed through the stator component 10 to generate an excitation magnetic field 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.

[0034] Combination Figure 2-Figure 5 In this embodiment, the valve device includes a nut assembly 30, a sleeve, a fixing member 50 and a valve seat 20. At least part of the fixing member 50 is located in the inner cavity of the sleeve. Along the axial direction of the valve device, part of the nut assembly 30 is located on one side of the fixing member 50, and part of the valve seat 20 is located on the opposite side of the fixing member 50. The fixing member 50 includes a mounting cavity 52, at least part of the nut assembly 30 is located in the mounting cavity 52, and the nut assembly 30 and the fixing member 50 are connected by non-welding fixing. It can be understood that non-welding fixing can include interference connection, threaded connection, adhesive fixing, or interference combined with adhesive fixing or threaded connection combined with adhesive fixing; 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 fixed or limitedly connected to the valve seat 20. The non-welding fixing of the nut assembly and the fixing member can reduce the adverse effects of heat conduction on the internal components of the sleeve, such as the valve core assembly and the rotor assembly, during the welding process.

[0035] In some embodiments, the valve seat 20 is made of aluminum, the fixing member 50 is made of plastic, the fixing member 50 and the valve seat 20 are interference fit or threaded or glued, at least part of the nut assembly 30 is made of plastic, the fixing member 50 and the nut assembly 30 are interference fit or threaded or glued. Specifically, 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, and the fixing method includes injection molding fixation or interference or gluing, or interference 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, and the materials of the connecting portion 32 and the main body 31 are 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 connecting part 32 and the main body 31 are both made of plastic, which can reduce the weight of the valve device and relatively reduce the cost of the valve device. On the other hand, the connecting part 32 and the main body 31 are both made of plastic, and the manufacturing process is relatively simple, that is, the connecting part 32 and the main body 31 are injection molded into an integral structure. The main body 31 includes a mounting hole 311, and 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 part 41 of the valve core assembly 40 is located in the mounting hole 311, that is, one end of the screw part 41 passes through the mounting hole 311 of the main body 31 and is fixedly connected to the rotor assembly 26. The screw part 41 is threadedly connected to the nut assembly 30. Specifically, the screw part 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 main body 31, and the screw part 41 is threadedly matched with the main body 31 to convert the rotation of the rotor assembly 26 into the axial movement of the screw part 41 relative to the nut assembly 30.

[0036] Of course, in some other embodiments, the material of the connection part 32 is a metal material, such as a stainless steel material, and the main body 31 can be a special engineering plastic or composite material with a certain strength, such as a mechanically reinforced polyetheretherketone material (PEEK) or a modified polyetheretherketone material (PEEK), or a mechanically reinforced polyphenylene sulfide (PPS) or a modified polyphenylene sulfide (PPS) material. The connection part 32 is an injection molded insert and is formed into a nut assembly 30 by injection molding, and the main body 31 covers a portion of the connection part 32. For example, in this embodiment, the main body 31 covers the inner side of the connection part 32.

[0037] 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. In the related art, the connecting part is made of stainless steel, the valve seat is made of stainless steel, the connecting part and the valve seat are fixedly connected by welding, and the connecting part and the valve seat are both made of stainless steel, which increases the weight of the relative valve device and the cost. In this embodiment, the fixing member 50 is roughly a hollow cylindrical structure, the fixing member 50 includes an installation cavity 52, at least part of the nut assembly 30 is located in the installation cavity 52, the fixing member 50 includes a first step portion 51, that is, the first step portion 51 is formed on the wall portion forming the installation cavity 52, at least part of the connecting part 32 is located in the first step portion 51, at least part of the lower end of the connecting part 32 is against the first step portion 51, and the outer edge of the connecting part 32 is interference fit with the fixing member 50. Specifically, the first step portion 51 includes a first side wall portion 511 and a second side wall portion 512. Along the axial direction of the valve device, at least the lower end portion of the connecting portion 32 abuts against the first side wall portion 511 of the first step portion 51, thereby limiting the axial downward movement of the nut assembly 30. The outer edge portion of the connecting portion 32 is interference fit with the second side wall portion 512 of the first step portion 51, thereby limiting the axial and circumferential movement of the nut assembly 30.

[0038] In order to further strengthen the connection strength between the connecting portion 32 and the fixing member 50, in some implementations, the fixing member 50 is made of metal, and the fixing member 50 and the valve seat 20 are interference fit or threaded or glued, and at least part of the nut assembly 30 is made of plastic, and the fixing member 50 and the nut assembly 30 are interference fit or threaded or glued. The fixing member 50 and the connecting portion 32 can be fixedly connected by riveting. Specifically, as Fig.13 As shown, the fixing member 50 includes a crimping portion 53, and the lower end of the connecting portion 32 abuts against the first step portion 51, so that the first step portion 51 limits the connecting portion 32, limiting the position of the connecting portion 32 relative to the lowermost end of the fixing member 50, and the abutment between the lower end of the connecting portion 32 and the first step portion 51 includes direct abutment or indirect abutment. After riveting, at least part of the crimping portion 53 extends toward the axis of the nut assembly 30, that is, part of the crimping portion 53 abuts against the upper end of the connecting portion 32. It can be understood that along the axial direction of the valve device, at least part of the crimping portion 53 is located above the connecting portion 32, and limits the connecting portion 32, and the crimping portion 53 limits the connecting portion 32 from moving in the direction away from the valve seat 20 along the axial direction of the valve device.

[0039] Combination Figure 5 , Figure 6 , Fig.11The valve seat 20 is roughly hollow and cylindrical, 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 second step portion 23, that is, the second 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 is against the second step portion 23, and the fixing member 50 and the valve seat 20 are interference fit. Specifically, the second step portion 23 includes a first wall portion 231 and a second wall portion 232. The first wall portion 231 abuts against the lower end 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. The second 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-fitted with the fixing member 50, and the matching portion 2323 is interference-fitted 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 and 60 degrees. In contrast, the lower end of the fixing member 50 has a guide structure, and the guide portion 2321 of the valve seat 20 matches 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, the nut assembly 30 is fixed relative to the valve seat 20. In the related art, the connecting part is made of stainless steel, the valve seat is made of stainless steel, and the connecting part and the valve seat are fixed by welding. This solution omits the welding step, and the valve seat 20 is made of aluminum alloy, which relatively reduces the weight of the valve device and reduces the cost.

[0040] The sleeve 60 is fixedly connected to the valve seat 20. Specifically, the valve seat 20 includes a third step portion 24. Along the axial direction of the valve device, the third step portion 24 is close to the opening end of the valve seat 20 relative to the second step portion 23. The third step portion 24 includes a third wall portion 241 and a fourth wall portion 242. The distance from the fourth wall portion 242 to the axis of the valve device is L1, and the distance from the second 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 abuts against the third wall portion 241 of the third step portion 24, and at least part of the outer wall portion of the sleeve 60 abuts against the fourth wall portion 242. In the present application, the sleeve 60 and the valve seat 20 are fixed by welding. Specifically, the solder 13 is sleeved on the outer wall of the sleeve 60 and located at the upper end of the valve seat 20. The upper end of the valve seat 20 supports the solder 13. The fourth wall 242 of the third step 24 includes a gap section 2421 and an interference section 2422. In the axial direction of the valve device, 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 has a gap fit with the sleeve 60, and the interference section 2422 has an interference fit with the sleeve 60. The distance from the gap section 2421 of the fourth wall 242 to the sleeve 60 is defined as K, then 0<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 60 is defined as T, then L=2T~6T. During assembly, the sleeve 60 and the valve seat 20 are fixed with 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. During welding, the sleeve 60 and the gap section 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 gap section 2421 is the length of the weld. The length of the gap section 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. 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.

[0041] In some embodiments, in order to achieve better welding effect, such as Fig.11As shown, 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 third step portion 24. The stepped portion 251 includes a bottom 2512 and a side portion 2511. The side portion 2511 is arranged opposite to the sleeve 60, and the bottom 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 part of the outer wall of the sleeve 60. The width of the receiving groove 25 is defined as W, that is, the radial distance between the side portion 2511 of the stepped portion 251 and 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 bottom 2512 of the stepped 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 may also be a square, elongated, polygonal, or other structure; in other embodiments, a wire feeding mechanism may also be used to fill the solder into the receiving groove 25. In the present application, the solder 13 is brazed to enable mass production and improve the production cycle.

[0042] 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 fourth wall portion 242 of the third step portion 24 to the axis of the valve device is L1, the distance from the second wall portion 232 of the second step portion 23 to the axis of the valve device is L2, the fourth wall portion 242 abuts against the outer wall of the sleeve 60, and the second wall portion 232 abuts against the outer wall portion of the fixing member 50, that is, by adjusting the radial distance between the second wall portion 232 and the fourth 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.

[0043] Combination Figure 8 , Fig. 9The fixing member 50 includes a first section 54 and a second section 55. Along the axial direction of the valve device, the first section 54 is relatively far away from the valve seat 20 relative to the second section 55. At least part of the second section 55 is interference-fitted with the second wall portion 232 of the first step portion 51, thereby limiting the downward movement of the fixing member 50 along the axial direction of the valve device. In this embodiment, the sleeve 60 is an integral structure, and the first section 54 of the fixing member 50 is gap-fitted with the inner wall of the sleeve 60. When the sleeve 60 is an integral structure, the welding steps can be relatively reduced.

[0044] In some embodiments, the fixing member 50 includes a first section 54 and a second section 55. Along the axial direction of the valve device, the first section 54 is farther away from the valve seat 20 than the second section 55. The outer diameter of the first section 54 is greater than the outer diameter of the second section 55. At least a portion of the second section 55 is interference fit with the second wall portion 232. Fig.14 As shown, the sleeve 60 includes a first connecting section 61 and a second connecting section 62, the second connecting section 62 is closer to the valve seat 20 relative to the first connecting section 61, the first connecting section 61 and the second connecting section 62 are fixedly connected, at least a portion of the first connecting section 61 is interference fit with the first section 54, and at least a portion of the second connecting section 62 is interference fit with the first section 54. The sleeve 60 is provided with a first connecting section 61 and a second connecting section 62. During assembly, at least a portion of the second connecting section 62 is interference fit with the valve seat 20, and then the second connecting section 62 and the valve seat 20 are fixedly connected by welding, and then the nut assembly 30, the valve core assembly 40, and the rotor assembly 26 are assembled. At this time, at least a portion of the first section 54 of the fixing member 50 is interference fit with the second connecting section 62, and then the second connecting section 62 is assembled, and the lower end of the second connecting section 62 is abutted against the upper end of the first connecting section 61, and at least a portion of the first connecting section 61 is interference fit with the first section 54 of the fixing member 50, that is, the inner wall of the first connecting section 61 is abutted against the outer wall of the first section 54 of the fixing member 50, thereby limiting the movement of the first connecting section 61, ensuring that during the welding process of the first connecting section 61 and the second connecting section 62, the first connecting section 61 and the second connecting section 62 are relatively fixed and do not deviate.

[0045] The valve device also includes a valve seat 27, which 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 at the mounting hole 311 of the screw rod, and the outer wall of the upper end of the valve seat 27 is against the wall forming the mounting hole 311, that is, interference fit, 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, and the outer wall of the valve seat 27 is interference fit with the wall forming the mounting groove 21, 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 . 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.

[0046] 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 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.

[0047] 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 nut assembly (30), a sleeve (60), a fixing member (50) and a valve seat (20), wherein at least a portion of the fixing member (50) is located in the inner cavity of the sleeve (60), and along the axial direction of the valve device, a portion of the nut assembly (30) is located on one side of the fixing member (50), and a portion of the valve seat (20) is located on the other side of the fixing member (50); the fixing member (50) and the nut assembly (30) are fixed to each other without welding; the valve seat (20) comprises a mounting groove (21), at least a portion of the fixing member (50) is located in the mounting groove (21), and the fixing member (50) is fixedly connected to the valve seat (20).

2. The valve device according to claim 1, characterized in that The valve seat (20) is made of aluminum material, the fixing piece (50) is made of plastic material, the fixing piece (50) and the valve seat (20) are interference fit or threadedly connected or glued, and at least part of the nut assembly (30) is made of plastic material, the fixing piece (50) and the nut assembly (30) are interference fit or threadedly connected or glued.

3. The valve device according to claim 2, characterized in that The fixing member (50) includes an installation cavity (52), and part of the nut assembly (30) is located in the installation cavity (52). The nut assembly (30) includes a main body (31) and a connecting portion (32). The main body (31) and the connecting portion (32) are an integral structure, and the connecting portion (32) is located on the outer periphery of the main body (31). The fixing member (50) includes a first step portion (51), and the lower end portion of the connecting portion (32) abuts against the first step portion (51), and the side wall portion of the connecting portion (32) is interference fit with the fixing member (50).

4. The valve device according to claim 1, characterized in that The valve seat (20) is made of aluminum material, the fixing piece is made of metal material, the fixing piece (50) and the valve seat (20) are interference fit or threadedly connected or glued fixed, at least part of the nut assembly (30) is made of plastic material, and the fixing piece (50) and the nut assembly (30) are interference fit or threadedly connected or glued fixed.

5. The valve device according to claim 4, characterized in that The nut assembly (30) comprises a main body (31) and a connecting portion (32), the main body (31) and the connecting portion (32) are an integral structure, the connecting portion (32) is located on the outer periphery of the main body (31), the fixing member (50) comprises a first step portion (51), and the lower end portion of the connecting portion (32) abuts against the first step portion (51); The fixing member (50) includes a crimping portion (53), at least a portion of which extends toward the axis of the valve device, and at least a portion of which abuts against the upper end of the connecting portion (32); or, the lower end of the connecting portion (32) abuts against the first step portion (51), and the side wall portion of the connecting portion (32) is interference fit with the fixing member (50).

6. The valve device according to any one of claims 1 to 5, characterized in that: The valve seat (20) comprises a second step portion (23), the lower end portion of the fixing member (50) abuts against the bottom wall of the second step portion (23), and the fixing member (50) is interference fit with the side wall of the valve seat (20).

7. The valve device according to claim 6, characterized in that The second step portion (23) includes a first wall portion (231) and a second wall portion (232), wherein the first wall portion (231) abuts against the lower end portion of the fixing member (50), and the second wall portion (232) includes a guide portion (2321), a transition portion (2322) and a matching portion (2323), wherein along the axial direction of the valve device, the transition portion (2322) is located between the guide portion (2321) and the matching portion (2323), an inner diameter of the transition portion (2322) is larger than an inner diameter of the matching portion (2323), the transition portion (2322) is clearance-fitted with the fixing member (50), and the matching portion (2323) is interference-fitted with the fixing member (50).

8. The valve device according to claim 7, characterized in that The valve seat (20) includes a third step portion (24). Along the axial direction of the valve device, the third step portion (24) is close to the opening end of the valve seat (20) relative to the second step portion (23). The third step portion (24) includes a third wall portion (241) and a fourth wall portion (242). The distance between the fourth wall portion (242) and the axis of the valve device is L1, and the distance between the second wall portion (232) and the axis of the valve device is L2. L1 is greater than L2. The sleeve (60) abuts against the third wall portion (241) of the third step portion (24), and the outer wall portion of the sleeve (60) abuts against the fourth wall portion (242).

9. The valve device according to claim 8, characterized in that The thickness of the sleeve (60) is defined as T, then L1 = L2 + (2-4)T.

10. The valve device according to claim 9, characterized in that The fixing member (50) comprises a first section (54) and a second section (55); along the axial direction of the valve device, the first section (54) is away from the valve seat (20) relative to the second section (55), and at least a portion of the second section (55) is interference fit with the second wall portion (232); the sleeve (60) is an integral structure, and the first section (54) and the sleeve (60) are clearance fit.

11. The valve device according to claim 9, characterized in that The fixing member (50) comprises a first section (54) and a second section (55); along the axial direction of the valve device, the first section (54) is away from the valve seat (20) relative to the second section (55); the outer diameter of the first section (54) is greater than the outer diameter of the second section (55); at least a portion of the second section (55) is in interference fit with the second wall portion (232); the sleeve (60) comprises a first connecting section (61) and a second connecting section (62); the second connecting section (62) is closer to the valve seat (20) relative to the first connecting section (61); the first connecting section (61) and the second connecting section (62) are fixedly connected; at least a portion of the first connecting section (61) is in interference fit with the first section (54).

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