Valve device

Abstract

The valve device comprises a nut assembly, a sleeve and a valve seat, part of the nut assembly is located in an inner cavity of the sleeve, the sleeve is fixedly connected with the valve seat, the nut assembly comprises a connecting piece and a nut piece, the nut piece is formed by injection molding at least with the connecting piece as an insert, the connecting piece comprises a connecting part and a main body part, and the connecting part and the main body part are of an integrated structure. In the axial direction of the valve device, the main body part extends towards the valve seat relative to the connecting part, and the main body part is fixedly connected with the valve seat. The nut assembly and the valve seat are connected without being fixed in a welding mode, and therefore the adverse effect on related parts caused by welding heat conduction 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] The valve device includes a nut assembly, a valve seat, and a valve core assembly. The nut assembly is transmission-connected to the valve core assembly, and the nut assembly is relatively fixed to the valve seat. In the related technology, the nut assembly has a connecting plate, and the connecting plate and the valve seat are both made of stainless steel. The nut assembly is welded and fixed to the valve seat by the connecting plate. The heat conduction caused by welding may affect the performance of related components. Therefore, technical personnel in this field are in urgent need of solving the above-mentioned technical problems. Summary of the invention

[0003] The purpose of the present application is to provide a valve device, which is conducive to improving heat conduction when the nut assembly is connected to the valve seat.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: the valve device includes a nut assembly, a sleeve and a valve seat, part of the nut assembly is located in the inner cavity of the sleeve, the sleeve is fixedly connected to the valve seat, the nut assembly includes a connecting piece and a nut piece, the nut piece is formed by injection molding with at least the connecting piece as an insert, the connecting piece includes a connecting portion and a main body portion, the connecting portion and the main body portion are an integral structure, along the axial direction of the valve device, the main body portion extends relative to the connecting portion toward the valve seat, and the main body portion is fixedly connected to the valve seat without welding.

[0005] In one embodiment provided in the present application, the nut assembly of the valve device includes a connector and a nut member, the connector includes a connecting portion and a main body, the connector is an insert and is injection molded with the nut member to form an integral structure, and the main body is fixedly connected to the valve seat without welding. In the present application, the connection between the nut assembly and the valve seat is not fixed by welding, thereby reducing the adverse effects of welding heat conduction on related components. 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 It is a structural schematic diagram of a nut assembly of a valve device;

[0010] Figure 5 is a cross-sectional schematic diagram of a nut assembly of a valve device;

[0011] Figure 6 for Figure 5 A schematic diagram of the structure of the connecting piece of the nut assembly;

[0012] Figure 7 for Figure 5 A schematic structural diagram of a nut member of a nut assembly;

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

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

[0015] Fig.10 is a schematic cross-sectional view of a valve seat of a 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.

[0018] The reference numerals in the figures are as follows: 10, stator component; 11, coil assembly; 12, injection molding part; 200, valve component; 20, valve seat; 21, mounting groove; 23, first step portion; 231, first wall portion; 232, second wall portion; 2321, guide portion; 2322, transition portion; 2323, interference portion; 24, second step portion; 241, third wall portion; 242, fourth wall portion; 2421, gap section; 2422, interference section; 26, rotor assembly; 27. Valve mouth; 271. Valve mouth; 272. Side hole; 30. Nut assembly; 31. Nut piece; 311. Mounting hole; 312. Matching part; 32. Connecting piece; 320. Mounting cavity; 321. Connecting part; 322. Main body; 3221. Large diameter section; 3222. Small diameter section; 323. Reinforcement part; 40. Valve core assembly; 41. Screw rod; 42. Valve core; 60. Sleeve; 70. First sealing member; 71. Second sealing member; 72. Third sealing member. DETAILED DESCRIPTION

[0019] 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.

[0020] It should be understood that although the first, second, third, fourth, etc. may be used to describe various information in this application, this 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.

[0021] 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 12 , 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.

[0022] Combination Figure 1-Figure 12 The valve component 200 includes a valve seat 20, a nut assembly 30, a sleeve 60, 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 in the inner cavity of the sleeve 60, 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 the present 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 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 26 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 port portion 27, and the valve port portion 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 3 The up and down directions only indicate relative positions and do not represent the actual status of the product when in use.

[0023] In this embodiment, the valve device includes a nut assembly 30, a sleeve 60, and a valve seat 20, a part of the nut assembly 30 is located in the inner cavity of the sleeve 60, the sleeve 60 is fixedly connected to the valve seat 20, and the nut assembly 30 is fixedly connected to the valve seat 20; the nut assembly 30 includes a connector 32 and a nut member 31, and the connector 32 and the nut member 31 are fixedly connected. It should be noted that the fixed connection means that the nut member 31 is at least formed by injection molding with the connector 32 as an insert, and the connector 32 includes a connecting portion 321 and a main body 322, and the connecting portion 321 and the main body 322 are integrally structured. Along the axial direction of the valve device, the main body 322 extends relative to the connecting portion 321 toward the valve seat 20, and the main body 322 is fixedly connected to the valve seat 20 without welding. Among them, the non-welding fixed connection method includes threaded connection, interference connection or adhesive fixation, or threaded connection combined with adhesive fixation, or interference connection combined with adhesive fixation. In this embodiment, the nut member 31 is formed by at least injection molding with the connecting member 32 as an insert. The specific connecting member is made of metal, and the connecting member 32 is formed by profile machining, or the connecting member 32 is formed by stamping or forging combined with machining. The nut member 31 is made of plastic material, 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 piece is roughly in the shape of a hollow cylinder. The connecting piece 32 includes a connecting portion 321 and a main body portion 322. The connecting portion 321 and the main body portion 322 are an integral structure. It can be understood that the connecting portion 321 and the main body portion 322 are formed by machining of profiles. Along the radial direction of the connecting piece 32, the connecting portion 321 extends toward the axis of the connecting piece 32 relative to the main body portion 322. Along the axial direction of the connecting piece 32, the main body portion 322 extends toward the valve seat 20 relative to the connecting portion 321, that is, the connecting portion 321 is equivalent to the radial section of the connecting piece 32, and the main body portion 322 is equivalent to the axial section of the connecting piece 32. The connecting piece 32 includes an installation cavity 320, which runs through the upper and lower ends of the connecting piece 32, part of the nut piece 31 is located in the installation cavity, and at least part of the connecting portion 321 is embedded in the nut piece 31.

[0024] In order to ensure reliable connection and fixation between the nut member 31 and the connecting member 32, the inner side of the connecting member 32 that cooperates with the nut member 31 has a reinforcing portion 323, and the nut member 31 has a matching portion 312 that cooperates with the reinforcing portion 323, and the matching portion 312 is formed by injection molding. Specifically, the reinforcing portion 323 can be a structure in which the inner side wall of the connecting portion 321 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 323 can be set on the basis of a circular structure to make it a non-standard circular structure, such as Figure 6 As shown, along the radial direction of the connecting member 32, the reinforcing portion 323 is recessed outward relative to the inner side wall of the connecting portion 321, or the reinforcing portion 323 is protruded inward relative to the inner side wall of the connecting portion 321. The reinforcing portion 323 can be arranged at any position where the connecting portion 321 and the nut member 31 cooperate. The reinforcing portion 323 makes the shape of the inner wall of the connecting portion 321 non-standard circular or the contact position between the connecting member 32 and the nut member 31 non-standard plane. For example, when the cross section of the connecting portion 321 is circular, the reinforcing portion 323 is recessed outward relative to the inner side wall of the connecting portion 321 in the radial direction, and the mating portion 312 where the nut member 31 and the reinforcing portion 323 of the connecting portion 321 cooperate is a protruding structure, and the mating portion 312 and the nut member 31 are formed by injection molding. The concave-convex structure matched with the reinforcement part 323 is used to fix the reinforcement part 323, so that the connection between the two is more reliable. Even if the connecting piece 32 is subjected to force, the connection strength between the two is increased compared with when the connecting piece 32 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.

[0025] The nut member 31 includes a mounting hole 311, which passes through the upper and lower ends of the nut member 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 member 31 and is fixedly connected to the rotor assembly 26. 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 member 31. The screw rod 41 and the nut member 31 are threadedly matched, and the rotation of the rotor assembly 26 is converted into an axial movement of the screw rod 41 relative to the nut assembly 30.

[0026] In the present application, the rotational motion of the rotor assembly 26 is replaced by the axial motion of the screw rod 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, and the connecting part and the valve seat are fixedly connected by welding, which increases the weight of the relative valve device, and adds a welding process, which increases the cost. In this embodiment, the connecting piece and the nut assembly are formed by injection molding, and the connecting piece and the valve seat are fixedly connected. It should be noted that the above-mentioned fixed connection is a fixed connection in a non-welding manner, such as interference fit, threaded connection or adhesive fixation between the connecting piece and the valve seat. 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 322 is located in the mounting groove 21, the main body 322 has an external thread, and the part of the valve seat 20 that matches the main body 322 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. When the connecting member 32 is made of metal, the connecting member 32 is formed by forging or stamping and combined with machining. The external thread of the connecting member 32 is formed by machining before injection molding, or the external thread of the connecting member 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 and combined with machining, and the internal thread of the valve seat 20 is formed by machining.

[0027] In other embodiments, the main body 322 of the connector 32 is tightly fitted with the valve seat 20, i.e., an interference fit. At least the main body 322 of the connector 32 is located in the mounting groove 21 of the valve seat 20, and the outer side wall of the main body 322 is interference fit with the wall forming the mounting groove 21. Specifically, the outer side wall of the main body 322 is interference fit with the part of the first wall 231 forming the mounting groove 21, and the outer diameter of the first wall 231 is greater than the inner diameter of the wall forming the mounting groove 21 that cooperates therewith. In some other implementations, the valve seat 20 includes a step portion, the bottom of the main body 322 is against the step surface of the step portion, and part of the main body 322 is tightly fitted with the side wall portion of the step portion.

[0028] The step portion is located at the wall portion forming the mounting groove 21, at least part of the lower end portion of the main body portion 322 of the connecting member 32 abuts against the step portion, and the connecting member 32 is interference-fitted with the valve seat 20. Specifically, the step portion includes a first wall portion 231 and a second wall portion 232, the first wall portion 231 abuts against the lower end portion of the connecting member 32, thereby limiting the movement of the connecting member 32 relative to the valve seat 20 along 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 an interference portion 2323, along the axial direction of the valve device, the transition portion 2322 is located between the guide portion 2321 and the interference portion 2323, the inner diameter of the transition portion 2322 is larger than the inner diameter of the interference portion 2323, the transition portion 2322 is clearance-fitted with the connecting member 32, and the interference portion 2323 is interference-fitted with the connecting member 32. Specifically, the guide portion 2321 and the transition portion 2322 form a certain angle, and the angle is controlled between 25-75 degrees; in contrast, the lower end of the connector 32 has a guide structure, and the guide portion 2321 of the valve seat 20 cooperates with the guide structure of the connector 32, which is convenient for assembly. The valve seat 20 is provided with a step portion, and the lower end of the connector 32 abuts against the step surface of the step portion. The setting of the step surface can limit the axial movement of the connector 32, so that the connector 32 is positioned at a suitable position.

[0029] Part of the sleeve 60 is located in the installation groove 21, and the outer wall of the sleeve 60 is interference fit with the wall forming the installation groove 21; the connecting piece 32 has a large diameter section 3221 and a small diameter section 3222, and along the axial direction of the valve device, the small diameter section 3222 is closer to the valve seat 20 relative to the large diameter section 3221, and the sleeve 60 and the small diameter section 3222 are clearance fit. Specifically, as Figure 5 As shown, the connector 32 includes a large diameter section 3221 and a small diameter section 3222, and the large diameter section 3221 and the small diameter section 3222 are located in the main body 322, and the outer diameter of the large diameter section 3221 is greater than the outer diameter of the small diameter section 3222. In some embodiments, the large diameter section 3221 is interference fit with the sleeve 60. For example, the sleeve 60 includes an upper section and a lower section, wherein the lower section is fixedly connected to the valve seat 20, and the upper section is welded and fixed to the lower section. At this time, part of the upper section is interference fit with the large diameter section 3221 of the connector 32, and part of the lower section is interference fit with the outer diameter of the connector 32. The interference fit of the large diameter section 3221 can relatively fix the positions of the upper section and the lower section and maintain their coaxiality, that is, the positioning welding of the two can be achieved without the use of external clamps; in other embodiments, the sleeve 60 and the large diameter section 3221 have a clearance fit, for example, the sleeve 60 is a one-piece type, and the sleeve 60 and the small diameter section 3222 have a clearance fit, so as to reduce the adverse effects of heat conduction on related components in the sleeve 60 when the sleeve 60 is welded to the valve seat 20. At this time, the provision of the large diameter section 3221 improves the strength of the connector 32 to a certain extent.

[0030] The sleeve 60 is fixedly connected to the valve seat 20, and part of the sleeve 60 is located in the installation groove 21. The outer wall of the sleeve 60 is interference fit with the wall forming the installation groove 21. The inner diameter of the wall forming the installation groove 21 that matches the sleeve 60 is defined as d1, and the inner diameter of the wall forming the installation groove 21 that matches the connecting piece 32 is defined as d2, then d1 is greater than d2, and the sleeve 60 is welded and fixed to the valve seat 20. Specifically, the valve seat 20 includes a second step portion 24. Along the axial direction of the valve device, the second step portion 24 is closer to the opening end of the valve seat 20 relative to the second step portion 24. The second 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 is against the third 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 fourth wall portion 242. In the present application, the sleeve 60 and the valve seat 20 are welded and fixed. Specifically, before welding, the solder 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. The fourth wall 242 of the second 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=2.5T-5.5T. During assembly, the sleeve 60 and the valve seat 20 are fixed with interference fit before welding. The solder is located at the upper end of the valve seat 20, and the solder sleeve is set on the sleeve 60. 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. 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.

[0031] 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. The setting of the gap can reduce the heat transfer. Specifically, the distance from the fourth wall portion 242 of the second 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 24 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, 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 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.

[0032] The valve device also includes a valve port 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 port 27, the valve port 27 has a valve port 271, the valve core assembly 40 can move axially relative to the valve port 271, and the valve core 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 port 27 is fixedly or position-limitedly connected to the valve seat 20, and the other end of the valve port 27 is position-limitedly or fixedly connected to the nut assembly 30. Specifically, the upper end of the valve port 27 is located in the mounting hole 311 of the screw rod 41, and the outer wall of the upper end of the valve port 27 abuts against the wall forming the mounting hole 311, that is, an interference fit, and the other end of the valve port 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 port 27 and the wall forming the mounting groove 21 are interference fit, thereby fixing the valve port 27. The valve port 27 has a side hole 272, which passes through the inner and outer walls of the valve port 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.

[0033] The valve device also includes a first seal 70, a second seal 71 and a third seal 72, 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 72 are respectively located on both sides of the side hole 272, 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 72 is pressed between the valve mouth 27 and the valve body to limit the working medium from leaking from the valve mouth 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.

[0034] 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 invention comprises a nut assembly (30), a sleeve (60) and a valve seat (20), wherein a part of the nut assembly (30) is located in the inner cavity of the sleeve (60), the sleeve (60) is fixedly connected to the valve seat (20), the nut assembly (30) comprises a connecting piece (32) and a nut piece (31), the nut piece (31) is at least formed by injection molding with the connecting piece (32) as an insert, the connecting piece (32) comprises a connecting portion (321) and a main body portion (322), the connecting portion (321) and the main body portion (322) are an integral structure, and along the axial direction of the valve device, the main body portion (322) extends relative to the connecting portion (321) in a direction toward the valve seat (20), and the main body portion (322) is fixedly connected to the valve seat (20) without welding.

2. The valve device according to claim 1, characterized in that The connecting member comprises an installation cavity (320), a portion of the nut member (31) is located in the installation cavity (320), and along the radial direction of the connecting member (32), the connecting portion (321) extends toward the axis of the connecting member (32) relative to the main body (322), and at least a portion of the connecting portion (321) is embedded in the nut member.

3. The valve device according to claim 2, characterized in that The valve seat (20) has a mounting groove (21), at least a portion of the main body (322) is located in the mounting groove (21), the main body (322) has an external thread, and a portion of the valve seat (20) that matches the main body (322) has an internal thread, and the valve seat (20) is threadedly connected to the nut assembly (30).

4. The valve device according to claim 2, characterized in that The valve seat (20) has a mounting groove (21), at least a portion of the main body (322) is located in the mounting groove (21), and a portion of the main body (322) is interference-fitted with a wall portion forming the mounting groove (21).

5. The valve device according to claim 4, characterized in that The valve seat (20) comprises a first step portion (23), the bottom of the main body (322) abuts against the step surface of the first step portion (23), and part of the main body (322) is tightly matched with the side wall portion of the first step portion (23).

6. The valve device according to claim 1 or 5, characterized in that: Part of the sleeve (60) is located in the installation groove (21), and the outer wall of the sleeve (60) is interference-fitted with the wall portion forming the installation groove (21). The main body (322) connecting piece (32) has a large diameter section (3221) and a small diameter section (3222). Along the axial direction of the valve device, the small diameter section (3222) is close to the valve seat (20) relative to the large diameter section (3221), and the sleeve (60) and the large diameter section (3221) are interference-fitted, and the sleeve (60) and the small diameter section (3222) are clearance-fitted.

7. The valve device according to any one of claims 1 to 6, characterized in that: The valve seat (20) is made of aluminum material, the connecting piece (32) is made of metal, the connecting piece (32) has a reinforcing portion (323) at a position where it is connected to the nut piece (31), the nut piece (31) has a matching portion (312) that matches the reinforcing portion (323), and the matching portion (312) is an injection molded part.

8. The valve device according to claim 7, characterized in that Along the radial direction of the connecting member (32), the reinforcing portion (323) is recessed outwardly relative to the inner side wall of the connecting portion (321), or the reinforcing portion (323) is protruded inwardly relative to the inner side wall of the connecting portion (321).

9. The valve device according to claim 8, characterized in that The valve device comprises a rotor assembly (26), a screw rod (41) and a valve core assembly (40); the rotor assembly (26) is fixedly connected or transmission-connected to the screw rod (41); the valve core assembly (40) is limitedly connected or fixedly connected or is an integral structure to the screw rod (41); the valve device comprises a valve mouth portion (27); at least a portion of the valve mouth portion (27) is located in the mounting groove (21); and the valve mouth portion (27) is fixedly connected to the valve seat (20).

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