Throttling element, throttling valve and manufacturing method of throttling element

Abstract

The throttling element comprises a sleeve, a movable assembly and a fixed part, part of the fixed part is located in an inner cavity of the sleeve, the sleeve is fixedly connected with the fixed part, and the movable assembly is in threaded fit with the fixed part; the fixing part comprises a nut part and a valve seat part, part of the nut part is located above the valve seat part, the nut part and the valve seat part are of an integrated structure, the throttling element comprises a valve port part, the valve port part is provided with a valve port, and the valve port part and the valve seat part are fixedly connected or connected in a limiting mode. The assembly error is reduced, the coaxiality of the nut part and the valve seat part is improved, the assembly steps can be reduced, and the assembly efficiency is improved.

Description

Technical Field

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

[0002] In the related art, the nut is fixedly connected to the valve seat through a connecting plate. Specifically, the metal connecting plate is an insert and the plastic nut is integrally injection molded, and then the connecting plate is welded to the end face of the valve seat. In this solution, it is difficult to ensure the coaxiality of the nut and the valve seat, which increases the assembly error of the valve needle and the valve port, thereby bringing hidden dangers to product reliability. Summary of the invention

[0003] The purpose of the present application is to provide a throttling element, a throttling valve and a manufacturing method of the throttling element, which is helpful to improve the assembly accuracy of the throttling element.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a throttling element, including a sleeve, a movable component and a fixed part, part of the fixed part is located in the inner cavity of the sleeve, the sleeve and the fixed part are fixedly connected, and the movable component is threadedly matched with the fixed part; the fixed part includes a nut part and a valve seat part, part of the nut part is located above the valve seat part, the nut part and the valve seat part are an integral structure, the throttling element includes a valve mouth part, the valve mouth part has a valve mouth, and the valve mouth part is fixedly connected or limit-connected to the valve seat part.

[0005] At the same time, a manufacturing method of a throttling element is provided, comprising a sleeve, a movable assembly and a fixing member, wherein the fixing member comprises a nut portion and a valve seat portion, and the movable assembly comprises a screw rod and a valve core component. The manufacturing method comprises the following steps:

[0006] Manufacturing the fixing parts: integrally forming the nut part and the valve seat part;

[0007] Manufacturing the movable assembly: fixedly connecting or limiting the connection between the screw rod and the valve core component;

[0008] Assembling the fixing member and the movable component to form a first component: inserting the movable component into the fixing member so that the fixing member and the movable component are threadedly matched;

[0009] Assembling the rotor component and the first component to form a second component: fixing or limiting the connection between the rotor component and the screw rod;

[0010] Assemble the sleeve and the second component: arrange the sleeve on the outer periphery of the second component, and weld the fixing piece to the sleeve.

[0011] The present application also provides a throttle valve, comprising a valve body, a stator component, and a throttling element as described in any of the above claims, wherein part of the throttling element is located inside the stator component, the throttling element is fixedly or limit-connected to the stator component, at least one of the valve body component and the throttling element has a recess at a position cooperating with the other, and the throttle valve also comprises a seal, which is limited to the recess.

[0012] The throttling element, throttle valve and manufacturing method of the throttling element proposed in the above-mentioned embodiments provided by the present application, the fixing part includes a nut part and a valve seat part, the nut part and the valve seat part are an integrated structure, which reduces assembly errors, improves the coaxiality of the nut part and the valve seat part, and can also reduce the assembly steps and improve the efficiency of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a cross-sectional schematic diagram of a throttle valve;

[0014] Figure 2 for Figure 1 A schematic cross-sectional view of a throttling element of a middle throttle valve;

[0015] Figure 3 for Figure 2 A schematic diagram of the structure of the fixing part of the throttling element;

[0016] Figure 4 for Figure 3 A schematic cross-sectional view of a fixing member;

[0017] Figure 5 for Figure 2 A schematic diagram of the structure of the valve port portion of the middle throttling element;

[0018] Figure 6 for Figure 2 A schematic cross-sectional view of the middle valve port;

[0019] Figure 7 It is an assembly diagram of the throttling element, stator component and valve body in the throttle valve.

[0020] The reference numerals in the figures are as follows: 10, stator component; 11, coil assembly; 12, injection molding part; 121, groove; 200, throttling element; 20, fixing member; 201, first end portion; 202, second end portion; 21, valve seat portion; 211, step portion; 22, nut portion; 23, mounting hole; 231, first hole section; 232, second hole section; 2321, first sub-hole section; 2322, second sub-hole section; 24, notch portion; 25, guide rail; 26, slip ring ; 30. Movable assembly; 31. Rotor component; 32. Screw rod; 33. Valve core component; 40. Valve mouth; 401. First matching part; 402. Second matching part; 41. Valve mouth; 42. Expanding part; 50. Sleeve; 100. Valve body; 101. Valve cavity; 102. First interface; 103. Second interface; 104. Recess; 1041. First recess; 1042. Second recess; 60. First seal; 61. Second seal; 62. Third seal. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] The throttle valve or throttle element provided by the present invention can be applied to refrigerant systems such as commercial or vehicle thermal management systems or other systems that require heat management such as thermal management of batteries, thermal management of electrical components, etc. The throttle valve can be assembled with the system, or the valve body part can be provided by the system and assembled into the system or assembly in the form of a throttle element, and the coil components can be assembled together or assembled with the system.

[0024] Combination Figure 1-Figure 7The throttle valve includes a throttle element 200 and a stator component 10. The stator component 10 is located at the periphery of at least part of the throttle element 200. The stator component 10 is fixedly or positionally connected to the throttle element 200. Furthermore, a seal can be provided between the stator component 10 and the throttle element 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 throttle element 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. The valve device is electrically connected and / or signal-connected to the outside world through the stator component 10.

[0025] The throttling element 200 includes a sleeve 50, a movable component 30 and a fixing member 20, a part of the fixing member 20 is located in the inner cavity of the sleeve 50, the sleeve 50 and the fixing member 20 are fixedly connected, such as by welding, and the movable component 30 is threadedly matched with the fixing member 20; the fixing member 20 includes a nut portion 22 and a valve seat portion 21, a part of the nut portion 22 is located above the valve seat portion 21, the nut portion 22 and the valve seat portion 21 are an integral structure, and the throttling element 200 includes a valve port portion 40, the valve port portion 40 has a valve port 41, and the valve port portion 40 is fixedly connected or limitedly connected to the valve seat portion 21. In the known technology, the nut is fixedly connected to the valve seat through a connecting plate, specifically, the connecting plate made of metal is an insert and a nut made of plastic is integrally injection molded, and then the connecting plate is welded to the end face of the valve seat. The assembly of two parts inevitably involves assembly tolerances, so the coaxiality of the nut and the valve seat in the known solution is difficult to ensure. In the present application, the nut portion and the valve seat portion are an integrated structure that can ensure the coaxiality of the nut portion and the valve seat portion, thereby improving the assembly accuracy.

[0026] The movable component 30 of the throttling element 200 includes a rotor component 31, a screw rod 32 and a valve core component 33. The rotor component 31 and the screw rod 32 are fixedly connected or transmission-connected. The screw rod 32 and the valve core component 33 are limitedly connected or fixedly connected or transmission-connected. The screw rod 32 has an external thread. The external thread of the screw rod 32 matches the internal thread of the nut part 22. The screw rod 32 is fixedly connected or limitedly connected to the valve core component 33. Of course, in other embodiments, the screw rod 32 and the valve core component 33 can be formed as one piece. The throttling element 200 also includes a valve port 40. At least part of the valve core component 33 is located in the inner cavity of the valve port 40. The valve port 40 has a valve port 41. The valve core component 33 can move axially relative to the valve port. The valve core component 33 cooperates with the valve port 41 to adjust the flow area of ​​the valve port 41. When a predetermined current is passed through the stator component 10, an excitation magnetic field can be generated to drive the rotor component 31 to rotate. The rotational motion of the rotor component 31 is converted into an axial up-and-down movement of the screw rod 32. The valve core component 33 is limitedly connected or fixedly connected to the screw rod 32, so that the screw rod 32 drives the valve core component 33 to move axially relative to the valve seat. In this embodiment, a portion of the outer wall of the screw rod 32 is formed with an external thread, and the fixing member 20 includes an internal thread that matches the external thread of the screw rod 32. The external thread of the screw rod 32 matches the internal thread of the fixing member 20. Specifically, the fixing member 20 includes a nut portion 22 and a valve seat portion 21, and the internal thread is located in the nut portion 22 of the fixing member 20. The rotor component 31 of the movable component 30 can rotate relative to the fixed component 20 and can realize the up and down movement within the set range through the above-mentioned thread combination. The valve core component 33 of the movable component 30 can move up and down within a certain range, so that the valve core component 33 moves in the direction close to the valve port 40 or moves away from the valve port 40, so as to adjust the flow cross-sectional area of ​​the valve port 40 after the valve core component 33 cooperates with the valve port 41, or adjust the opening of the valve port 41, so as to adjust the flow rate of the refrigerant through the valve port 41 during use. It should be noted that for the convenience of description, the upper and lower directions are defined as the upper and lower directions in the attached drawings of the specification. Figure 1 The up and down directions only indicate relative positions and do not represent the actual status of the product when in use.

[0027] Combination Figure 3-Figure 4In this embodiment, the fixing member 20 includes a nut portion 22 and a valve seat portion 21. In the axial direction, at least part of the nut portion 22 is located above the valve seat portion 21, and at least part of the nut portion 22 is located in the sleeve 50. The nut portion 22 and the valve seat portion 21 are integrally formed or integrally structured. The valve seat portion 21 and the nut portion 22 are made of the same metal material, and the nut portion 22 and the valve seat portion 21 are formed into an integral structure by powder metallurgy, or the valve seat portion 21 is made of plastic material, the nut portion 22 is made of plastic material, and the nut portion 22 and the valve seat portion 21 are formed into an integral structure by injection molding. The movable component 30 and the fixing member 20 realize threaded transmission through the external thread of the screw rod 32 and the internal thread of the nut portion 22, that is, the movable component 30 rotates relative to the fixing member 20 and can realize up and down movement within a set range through threaded matching. The fixing member 20 includes a mounting hole 23. Along the axial direction of the throttling element, the mounting hole 23 passes through the upper end of the nut portion 22 and the lower end of the valve seat portion 21. The mounting hole 23 includes a first hole section 231 that matches the screw rod 32 and a second hole section 232 that matches the valve port portion 40. Part of the valve port portion 40 is located in the second hole section 232, and part of the outer wall of the valve port portion 40 is interference fit with the wall portion forming the second hole section 232. It can be understood that along the axial direction of the throttling element 200, the fixing member 20 includes a first end 201 and a second end 202. The second end 202 is close to the valve port 41 relative to the first end 201, that is, the first end 201 is the upper end of the nut portion 22, and the second end 202 is the lower end of the valve seat portion 21. The mounting hole 23 passes through the first end 201 and the second end 202 of the fixing member 20. The mounting hole 23 includes a first hole section 231 and a second hole section 232. The portion of the mounting hole 23 that matches the screw rod 32 is defined as the first hole section 231, and the portion of the mounting hole 23 that matches the valve port portion 40 is defined as the second hole section 232. The apertures of the first hole section 231 and the second hole section 232 are adapted to the sizes of the screw rod 32 and the valve port portion 40. It can also be understood that the first hole section 231 is formed on the nut portion 22, and the second hole section 232 is formed on the valve seat portion 21. The screw rod 32 has an external thread, which is located on the outer wall of the screw rod 32. The fixing member 20 has an internal thread, which is located on the wall portion forming the first hole section 231. The external thread of the screw rod 32 matches the internal thread of the fixing member 20 to achieve a transmission connection between the screw rod 32 and the fixing member 20. Part of the valve mouth portion 40 is located in the second hole section 232 of the mounting hole 23, and the lower end portion of the valve mouth portion 40 is exposed from the second end portion of the fixing member 20, and the valve mouth portion 40 is limitedly matched with the fixing member 20. Specifically, the valve mouth portion 40 is tightly matched with the fixing member 20, that is, an interference fit, and part of the outer wall portion of the valve mouth portion 40 is interference fit with the wall portion forming the second hole section 232.In this solution, the second hole segment 232 includes a first sub-hole segment 2321 and a second sub-hole segment 2322. In the axial direction, the first sub-hole segment 2321 is closer to the first hole segment 231 than the second sub-hole segment 2322. The inner diameter D1 of the wall portion forming the first sub-hole segment 2321 is smaller than the inner diameter D2 of the wall portion forming the second sub-hole segment 2322. The valve port portion 40 includes a first matching portion 401 and a second matching portion 402. In the axial direction, the first matching portion 401 is farther away from the valve port 41 than the second matching portion 402. The first matching portion 401 is closer to the second matching portion 402 than the first matching portion 402. The outer diameter D3 of 01 is smaller than the outer diameter D4 of the second matching part 402. During assembly, the first matching part 401 of the valve mouth part 40 is gap-matched with the part of the wall forming the first sub-hole section 2321, the part of the second matching part 402 of the valve mouth part 40 is interference-matched with the part of the wall forming the first sub-hole section 2321, and the part of the second matching part 402 of the valve mouth part 40 is gap-matched with the wall forming the second sub-hole section 2322. The structural setting of the interference-matching part of this scheme is conducive to machining and simplifies the machining steps. Of course, in other embodiments, the inner diameter of the wall forming the second hole section 232 is the same, and the outer diameter of the middle section of the outer wall of the valve mouth part 40 that matches it is larger than the outer diameters of the two ends of the outer wall of the valve mouth part 40, which can also achieve interference fit between the valve mouth part 40 and the fixing part 20.

[0028] In other embodiments, the valve mouth portion 40 and the fixing member 20 can also be fixedly connected by threaded cooperation. Specifically, the valve mouth portion 40 has an external thread, which is located on the outer wall of the valve mouth portion 40. The valve seat portion 21 has an internal thread, which is located on the inner wall forming the second hole section 232. The valve mouth portion 40 and the valve seat portion 21 are threadedly fixedly connected.

[0029] In the related technology, the valve seat part and the nut part are separate structures. To achieve relative fixation, the valve seat part and the nut part must be connected by a connector, that is, the valve seat part is made of metal and the nut part is made of plastic. The connector is an insert and is integrally injection molded with the nut part. The connector is fixed to the valve seat by welding. When the nut part and the valve seat part are assembled, the coaxiality of the holes of the nut part and the valve seat part is difficult to ensure, which can easily cause problems such as valve jamming and large internal leakage, thereby bringing great hidden dangers to product reliability. In the present application, the valve seat part 21 and the nut part 22 are integrally structured, and the number of parts is relatively reduced, and the welding process for fixing the valve seat part 21 and the connector is reduced, the assembly steps are reduced, and the assembly is relatively simple. In addition, the mounting hole 23 of the valve seat portion 21 and the nut portion 22 are integrally formed through powder metallurgy technology, thereby avoiding the problem of coaxiality of the mounting hole 23 after assembly of the nut portion 22 and the valve seat portion 21. The valve mouth portion 40 is limitedly connected or fixedly connected to the fixing member 20, such as an interference connection or a threaded connection, to ensure the coaxiality of the hole in the valve mouth portion 40 used to accommodate the valve core component 33 and the mounting hole 23 of the fixing member 20, thereby improving the assembly accuracy and reducing the difficulty of manufacturing and assembly.

[0030] The fixing part 20 includes a step portion 211, a part of the inner wall of the sleeve 50 is tightly matched with a part of the side wall of the step portion 211, the end of the sleeve 50 is against the step surface of the step portion 211, the sleeve 50 is welded and fixed to the valve seat portion 21, the step portion 211 of the fixing part 20 is located at the end of the valve seat portion 21 away from the valve port 41, the sleeve 50 and the valve seat portion 21 are fixed by laser welding, the sleeve 50 and the step portion 211 of the fixing part 20 are tightly matched, so that the sleeve 50 and the fixing part 20 are relatively fixed, eliminating the use of a clamp when welding the two. In addition, laser welding is used for welding, and the energy of laser welding is relatively concentrated, and the impact on the material is relatively small. The fixing part 20 has a notch portion 24, and the notch portion 24 is located between the step portion 211 and the nut portion 22. As shown in the figure, a notch 24 is provided between the step 211 and the nut 22 of the fixing member 20. The notch 24 can reduce the use of materials in the powder metallurgy process, thereby reducing the weight of the fixing member 20 and reducing the cost. The step 211, the notch 24, the nut 22 and the valve seat 21 are integrally formed into an integral structure by powder metallurgy. Of course, in other implementations, the step 211 is formed by machining at a later stage.

[0031] The throttling element 200 also includes a guide rail 25 and a slip ring 26. The guide rail 25 is located outside the fixing member 20, that is, the guide rail 25 is located outside the nut portion 22 of the fixing member 20. The guide rail 25 and the slip ring 26 cooperate to limit the axial movement of the valve core component 33 up and down. In some embodiments of the present application, the guide rail 25, the nut portion 22, and the valve seat portion 21 are an integrated structure. Specifically, the guide rail 25, the nut portion 22, and the valve seat portion 21 are formed by powder metallurgy, or the guide rail 25, the nut portion 22, and the valve seat portion 21 are formed by injection molding. Compared with the related art, the assembly process and steps can be relatively reduced, saving costs.

[0032] In a specific embodiment, a manufacturing method of a throttling element is provided. The throttling element includes a sleeve 50, a movable component 30 and a fixing member 20. The fixing member 20 includes a nut portion 22 and a valve seat portion 21. The movable component 30 includes a screw rod 32 and a valve core component 33. When assembling the throttling element 200, the following steps may be included:

[0033] Manufacturing the fixing part 20: integrally forming the nut part 22 and the valve seat part 21. Specifically, the fixing part 20 includes the nut part 22 and the valve seat part 21, which are integrally formed by powder metallurgy or injection molding; providing metal powder and adhesive, mixing the metal powder and adhesive under a preset temperature condition to form a blank powder, injecting the blank powder into the mold cavity to obtain a molded blank of the fixing part 20, degreasing the molded blank of the fixing part 20 and then sintering it to obtain the fixing part 20. The fixing part 20 includes an internal thread, which is located in the first hole section 231 of the nut part 22, and the internal thread can be integrally formed with the nut part 22, or can be formed by machining later.

[0034] Manufacturing the movable assembly 30: providing an assembly of the screw rod 32 and the valve core component 33, and fixing or limiting the screw rod 32 and the valve core component 33;

[0035] Assemble the fixing member 20 and the movable member 30 to form a first assembly: insert the movable member 30 into the fixing member 20 so that the threads of the fixing member 20 and the fixing member 20 are matched; specifically, the screw rod of the fixing member is provided with an external thread, the fixing member is provided with an internal thread, and the screw rod and the fixing member are threadedly matched;

[0036] Assemble the rotor component 31 and the first component to form the second component, and fix or limit the rotor component 31 and the screw rod 32; in the present application, the rotor component and the screw rod are fixed by welding, riveting, crimping, etc.;

[0037] Assemble the sleeve 50 and the second component: arrange the sleeve 50 on the outer periphery of the second component, and weld the fixing member 20 to the sleeve 50;

[0038] Assemble the valve mouth part, insert the valve mouth part 40 into the mounting hole 23 of the fixing part 20, and the valve mouth part 40 and the fixing part 20 are interference fit or threaded fit; it should be noted that the two steps of assembling the valve mouth part 40 and assembling the rotor component 31 can be performed successively or simultaneously, and the valve mouth part 40 and the fixing part 20 can be assembled first, or the rotor component 31 and the screw rod 32 can be assembled first, and the fixation of the rotor component 31 and the screw rod 32 can be welding, riveting or crimping. The fixing method of the valve mouth part 40 and the fixing part 20 can be a tight fit connection or a threaded connection, or combined with glue curing bonding. Of course, in other embodiments, the assembly process of the valve mouth part can also be after assembling the sleeve and the second component.

[0039] refer to Figure 7The present application provides a throttle valve including a valve body 100, wherein the valve body 100 has a first interface 102, a second interface 103 and a valve cavity 101, wherein the first interface 102 and the second interface 103 are connected to two parts of the valve cavity 101, wherein the part where the first interface 102 is connected to the valve cavity 101 is relatively close to the bottom of the valve cavity 101, and the part where the second interface 103 is connected to the valve cavity 101 is relatively far from the bottom of the valve cavity 101. A throttle element 200 is partially located in the valve cavity 101, and the throttle element 200 and the valve body 100 are threadedly connected or tightly matched, and a recess 104 is provided at one of the matching parts of the throttle element 200 and the valve body 100, specifically, at least one of the matching parts of the fixing part 20 of the throttle element 200 and the valve body 100 is provided with a first recess 1041, and at least one of the matching parts of the valve mouth part 40 of the throttle element 200 and the valve body 100 is provided with a second recess The throttle valve further comprises a first seal 60 and a second seal 61. The first seal 60 is limitedly arranged in the first recess 1041 to limit the working medium from leaking from between the valve seat 21 and the valve body 100 to the outside of the throttle valve; the second seal 61 is limitedly arranged in the second recess 1042 to limit the working medium from leaking from between the valve mouth 40 and the valve body 100 to the outside of the throttle valve, so that the matching part of the throttle element 200 and the valve body 100 can be sealed. The throttle element 200 further comprises a third seal 62, which is located in the groove 121 formed between the sleeve 50 and the stator component 10. The left and right ends of the third seal 62 are respectively against the inner wall of the groove 121 and the outer wall of the sleeve 50. The lower end of the third seal 62 is against the welding part of the sleeve 50 and the valve seat. The main function of the third seal 62 is to prevent water, dust, etc. from entering the coil assembly 11 and affecting the performance of the coil assembly 11. The valve mouth portion 40 of this embodiment is also provided with a flared portion 42, and the flared portion 42 is located in the flow channel portion of the valve mouth 41 toward the first interface 102, which can make the refrigerant flow to the first interface 102 through the flared portion after throttling from the valve mouth 41, and can relatively improve the flow noise of the refrigerant. It should be noted that the valve body 100 can be provided separately, or it can be combined with the components of the system, such as providing a valve cavity 101 and a flow channel that match the throttling element 200 in the flow channel plate, so that there is no need to provide the valve body 100 separately, and it is convenient to communicate with other components through the flow channel. The structures that can be used in combination through deduction in the various embodiments of the present application are within the scope of protection of the present application.

[0040] 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 covered by the claims of the present invention.

Claims

1. A throttling element (200), characterized in that: It comprises a sleeve (50), a movable component (30) and a fixing part (20), wherein part of the fixing part (20) is located in the inner cavity of the sleeve (50), the sleeve (50) and the fixing part (20) are fixedly connected, and the movable component (30) is threadedly matched with the fixing part (20); the fixing part (20) comprises a nut part (22) and a valve seat part (21), wherein part of the nut part (22) is located above the valve seat part (21), and the nut part (22) and the valve seat part (21) are an integral structure, and the throttling element (200) comprises a valve mouth part (40), the valve mouth part (40) has a valve mouth (41), and the valve mouth part (40) is fixedly connected or limit-connected to the valve seat part (21).

2. The throttling element (200) according to claim 1, characterized in that The valve seat portion (21) is made of metal, the nut portion (22) is made of metal, and the nut portion (22) and the valve seat portion (21) are formed into an integral structure by powder metallurgy; or, the valve seat portion (21) is made of plastic, the nut portion (22) is made of plastic, and the nut portion (22) and the valve seat portion (21) are formed into an integral structure by injection molding.

3. The throttling element (200) according to claim 1 or 2, characterized in that: The nut part (22) has an internal thread; the movable component (30) includes a rotor part (31), a screw rod (32) and a valve core part (33); the rotor part (31) and the screw rod (32) are fixedly connected or transmission-connected; the screw rod (32) has an external thread; the external thread of the screw rod (32) and the internal thread of the nut part (22) match; the screw rod (32) and the valve core part (33) are fixedly connected or limit-connected.

4. The throttling element (200) according to claim 3, characterized in that The fixing member (20) includes a mounting hole (23), and along the axial direction of the throttling element, the mounting hole (23) passes through the upper end of the nut portion (22) and the lower end of the valve seat portion (21), and the mounting hole (23) includes a first hole section (231) that cooperates with the screw rod (32) and a second hole section (232) that cooperates with the valve mouth portion (40), a portion of the valve mouth portion (40) is located in the second hole section (232), and a portion of the outer wall of the valve mouth portion (40) is interference fit with the wall portion forming the second hole section (232).

5. The throttling element (200) according to claim 3, characterized in that The fixing member (20) includes a mounting hole (23), and along the axial direction of the throttling element, the mounting hole (23) passes through the upper end of the nut portion (22) and the lower end of the valve seat portion (21), and the mounting hole (23) includes a first hole section (231) that cooperates with the screw rod (32) and a second hole section (232) that cooperates with the valve mouth portion (40), and part of the valve mouth portion (40) is located in the second hole section (232), the valve mouth portion (40) has an external thread, and the valve seat portion (21) has an internal thread, and the internal thread of the valve seat portion (21) is located on the inner wall forming the second hole section (232), and the valve mouth portion (40) and the valve seat portion (21) are threadedly connected.

6. The throttling element (200) according to any one of claims 1 to 5, characterized in that: The fixing member (20) comprises a step portion (211), a portion of the inner wall portion of the sleeve (50) is tightly matched with a portion of the side wall portion of the step portion (211), an end portion of the sleeve (50) is abutted against a step surface of the step portion (211), and the sleeve (50) and the fixing member (20) are fixed by welding; the fixing member (20) has a notch portion (24), and the notch portion (24) is located between the step portion (211) and the nut portion (22) of the fixing member (20).

7. The throttling element (200) according to claim 6, characterized in that The fixing member (20) comprises a guide rail (25), wherein the guide rail (25) is located on the outer wall of the nut portion (22), and the guide rail (25), the nut portion (22) and the valve seat portion (21) are an integral structure.

8. A method for manufacturing a throttling element (200), characterized in that: The invention comprises a sleeve (50), a movable component (30) and a fixing component (20), wherein the fixing component (20) comprises a nut portion (22) and a valve seat portion (21), and the movable component (30) comprises a screw rod (32) and a valve core component (33). The manufacturing method comprises the following steps: Manufacturing a fixing member (20): integrally forming a nut portion (22) and a valve seat portion (21); Manufacturing the movable assembly (30): fixedly connecting or limiting the connection between the screw rod (32) and the valve core component (33); Assembling the fixing member (20) and the movable component (30) to form a first component: inserting the movable component (30) into the fixing member (20) so that the movable component (30) and the fixing member (20) are threadedly matched; Assembling the rotor component (31) and the first component to form a second component, and fixing or limiting the connection between the rotor component (31) and the screw rod (32); Assembling the sleeve (50) and the second component: arranging the sleeve (50) on the outer periphery of the second component, and welding and fixing the fixing member (20) to the sleeve (50).

9. The method for manufacturing a throttling element (200) according to claim 8, characterized in that: The specific steps of making the fixing member (20) are as follows: Metal powder and an adhesive are provided, and the metal powder and the adhesive are mixed under a preset temperature condition to form a blank powder, and the blank powder is injected into a mold cavity to obtain a molded blank of the fixing part (20), and the molded blank of the fixing part (20) is degreased and then sintered to obtain the fixing part (20).

10. A throttle valve, characterized in that: The throttling valve comprises a valve body (100), a stator component (10), and a throttling element (200) as described in any one of claims 1 to 7, wherein a portion of the throttling element (200) is located inside the stator component (10), the throttling element (200) is fixedly or position-limitedly connected to the stator component (10), at least one of the valve body (100) and the throttling element (200) has a recess (104) at a position matching with the other, and the throttling valve further comprises a sealing member, which is limited in the recess (104).

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