CN117823628A - Throttling element and throttle valve - Google Patents

Abstract

The throttling element comprises a sleeve, a movable assembly and a fixed assembly, wherein the fixed assembly comprises a plastic part assembly and a nut, the plastic part assembly comprises a connecting piece and a plastic part, and the plastic part covers part of the connecting piece; the connecting piece is provided with a connecting matching part, and at least part of the outer side of the connecting matching part is exposed out of the plastic piece; the plastic part is provided with the external thread part and the side hole, and the external thread part and the side hole are formed by injection molding, so that the processing is relatively simple, and the weight can be reduced.

Description

Throttling element and throttle valve

Technical Field

The invention relates to the technical field of fluid management, in particular to a throttling device and a throttling valve.

Background

The throttle valve or the throttle element is widely applied to various refrigerant systems, such as household or vehicle or commercial refrigerant systems, for throttling the refrigerant. How to make the system connection more convenient and to reduce the weight of the material is a technical problem for long-term efforts by those skilled in the art.

Disclosure of Invention

The purpose of this application is to provide a throttling element and choke valve, adopts the injection molding to process into the external screw thread portion that is used for connecting, can reduce the process of processing screw thread, and processing is simple and convenient relatively, and can realize the lightweight.

One embodiment of the present application provides a throttling element, which comprises a sleeve, a movable component and a fixed component, wherein the sleeve is fixedly connected with the fixed component, and the movable component is in threaded fit with the fixed component; the fixing assembly comprises a plastic part assembly and a nut, wherein the plastic part assembly comprises a connecting piece and a plastic part, the plastic part is provided with a main body part and a nut matching part, the sleeve is made of a metal material, the connecting piece is made of a metal material, and the sleeve and the connecting piece are fixed through welding; the plastic piece covers part of the connecting piece; the connecting piece is provided with a connecting matching part, and at least part of the outer side of the connecting matching part is exposed out of the plastic piece; the plastic part is provided with an external thread part and a side hole, the external thread part and the side hole are formed by injection molding, the external thread part is positioned on the main body part of the plastic part, the connecting part is positioned on one side of the external thread part of the plastic part, and the side hole is positioned on the other side of the external thread part of the plastic part.

There is also provided a throttle valve comprising a valve body member, a coil member, the throttle element of any one of the preceding claims, the valve body member having an internally threaded portion which mates with an externally threaded portion of the throttle element, the valve body member being threadably connected to the throttle element; at least one of the valve body member or the throttling element has a recess at a location for mating with the other, and the throttle valve further includes a seal member that is confined to the recess.

The throttling element and the throttling valve provided by the embodiment of the application enable the plastic part to cover part of the connecting piece, enable the outer side of the connecting matching part of the connecting piece to be at least partially exposed out of the plastic part so as to be convenient to connect, adopt injection molding to process an external thread part and a side hole for connection, reduce the working procedures of processing threads, the side hole and the like, and enable the processing to be relatively simple and convenient, and to realize light weight.

Drawings

FIG. 1 is a schematic diagram of one embodiment of a throttle valve;

FIG. 2 is a schematic cross-sectional view of the throttle valve of FIG. 1 taken along the A-A plane;

FIG. 3 is a schematic perspective view of a stationary assembly of the throttle valve of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the securing assembly shown in FIG. 3;

FIG. 5 is a schematic perspective view of the throttle valve mount;

FIG. 6 is a schematic cross-sectional view of the fastener of FIG. 5;

FIG. 7 is a schematic cross-sectional view of another embodiment of a securing assembly;

FIG. 8 is a schematic cross-sectional view of a second embodiment of a throttle valve;

FIG. 9 is a schematic cross-sectional view of a throttling element portion of the throttling valve;

FIG. 10 is a schematic perspective view of a stationary assembly of the throttle valve;

FIG. 11 is a schematic cross-sectional view of a stationary assembly of the throttle valve;

FIG. 12 is a schematic cross-sectional view of a third embodiment of a throttle valve;

FIG. 13 is an enlarged partial cross-sectional schematic view of yet another embodiment of a throttle valve.

10. 10a, 10b restriction element, 11 valve body member, 110 valve chamber, 1101 first chamber, 1102 second chamber, 111 first interface, 112 second interface, 113 female screw portion, 114 mating portion, 115 stepped portion, 12 connector, 121 stepped portion, 122 connector mating portion, 123 fixed reinforcement portion, 125 notched portion, 13 coil member, 14 fixed component, 140a valve portion, 1400 valve port, 1401 side opening, 1402 recess, 1403 flared portion, 1404 mating portion, 1405 spacing portion, 141 plastic member, 1411 male screw portion, 1412 female screw portion, 1413 spacing portion, 143 nut portion, 144 body portion, 145 valve port mating portion, 146 nut, 147 nut mating portion, 15 movable component, 151 magnetic rotor member, 152 valve core, 153 lead screw member, 1531 male screw portion, 18 sleeve, 51 first seal, 52 second seal

Detailed Description

The throttle valve or the throttle element provided by the invention can be applied to refrigerant systems such as commercial or vehicle heat management systems or other systems needing heat management such as battery heat management, electric device heat management and the like. The throttle valve can be assembled with the system, the valve body part can be provided by the system uniformly, the throttle valve is assembled into the system or the assembly in a throttle element mode, and the coil components can be assembled together or assembled with the system. Referring now to fig. 1-6, fig. 1 is a schematic diagram of one embodiment of a throttle valve, fig. 2 is a schematic diagram of A-A of the throttle valve shown in fig. 1, fig. 3 is a perspective diagram of a fixing assembly of the throttle valve, fig. 4 is a schematic diagram of a fixing assembly shown in fig. 3, fig. 5 is a schematic diagram of a fixing member of the throttle valve, and fig. 6 is a schematic diagram of a fixing member shown in fig. 5.

The throttle valve comprises a throttle element 10, a coil part 13 and a valve body part 11, wherein the valve body part 11 is provided with a first connector 111 and a second connector 112, the valve body part 11 is provided with a valve cavity 110, the first connector 111 is communicated with the second connector 112 at two parts of the valve cavity, the part of the first connector 111 communicated with the valve cavity is relatively close to the bottom of the valve cavity, and the part of the second connector 112 communicated with the valve cavity is relatively far away from the bottom of the valve cavity. The throttle element 10 is partially positioned in the valve cavity, the throttle element 10 is in threaded connection with the valve body part 11, one of the matching parts of the throttle element 10 and the valve body part 11 is provided with a concave part, and a first sealing piece 51 is arranged on the concave part in a limiting way, so that the matching part of the throttle element 10 and the valve body part 11 can be sealed. After the valve body part 11 is assembled with the throttling element 10, a cavity which is close to one side of the bottom of the valve body from the valve port 1400 in the valve cavity is defined as a first cavity 1101, a cavity which is close to the other side of the bottom of the valve body is defined as a second cavity 1102, the first cavity 1101 is communicated with the first interface 111, the second cavity 1102 is communicated with the second interface 112, the first cavity 1101 and the second cavity 1102 can be communicated through the valve port 1400, and the through-flow cross section of the valve port part can be adjusted so as to realize the adjustment of the refrigerant through-flow; in the case where the throttling element is capable of closing, there may be a situation in which the first chamber 1101 and the second chamber 1102 are not in communication. The valve port portion of the present embodiment is further provided with a flaring portion 1403, and the flaring portion 1403 is located at a flow path portion of the valve port toward the first port, so that the refrigerant can flow from the valve port to the first port through the flaring after throttling, and the flow noise of the refrigerant can be relatively improved.

The valve body member 11 includes the female screw portion 113, the female screw portion 113 is mated with the male screw portion 1411 of the throttle element 10, the valve body member 11 has the mating portion 114 mated with the valve port portion 140 of the throttle element 10, both cooperate with the second seal 52 to seal, so that the second chamber and the first chamber do not leak from the mating portion therebetween or the amount of leakage from the mating portion therebetween is reduced, and the valve port portion 140 is located inside the mating portion 114. The throttle valve has a first seal 51 and a second seal 52, the valve body member 11 and the throttle element 10 have a connection mating portion and a valve port mating portion, and at least one of the valve body member 11 and the throttle element 10 mating portion may be provided with a recess, a step portion, or the like to limit the seal, the throttle element 10 and the valve body member 11 are sealed by the seal mating, and the valve body member 11 abuts against the seal toward the mating portion of the throttle element 10 to seal between the valve body member 11 and the throttle element. The valve body member 11 may be provided separately or may be incorporated into a component of the system other than the separate arrangement, such as a flow conduit plate with internal threads 113 and valve chamber, so that the valve body member need not be provided separately and communicates with other components via the flow conduit.

The throttle element 10 has an external screw portion 1411 that mates with the valve body member 11, and the throttle element 10 is screwed with the valve body member 11. The throttling element 10 is sealed against the valve body part 11 by means of a first seal 51. The throttling element 10 comprises a sleeve 18, a movable assembly 15, a fixed assembly 14, the sleeve 18 being fixedly connected to the fixed assembly 14, e.g. by welding. The fixing assembly 14 includes a connecting member 12, a valve port 140, and a plastic member 141 formed by injection molding with the connecting member 12 as an insert, wherein the connecting member 12 is made of a metal material, the sleeve 18 is made of a metal material, such as stainless steel, the sleeve 18 is fixed with the connecting member 12, such as by welding, the connecting member 12 is a force-receiving member for threaded connection, the connecting member 12 has a force-receiving structure for fixing or connecting, the external profile of the connecting member 12 can be applied to the force of an assembling tool such as a wrench, and the external shape of the cross section of the external profile can be square, hexagonal, quincuncial, or irregular round with parallel opposite sides for force. In order to ensure that the plastic part 141 is connected and fixed reliably with the connecting piece 12, the inner side of the connecting piece 12, which is connected with the plastic part in a matching way, is provided with a fixed reinforcing part 123, in particular to a structure with a non-standard circular inner side wall, such as an irregular circular shape or quincuncial shape with a part of straight edge, etc. of the inner side wall section, or a fixed reinforcing part is arranged on the basis of the circular structure, so that the connecting piece is in a non-standard circular structure, such as a concave-convex structure is arranged when the connecting piece is in a circular shape and is used as the fixed reinforcing part, thus the connection of the connecting piece 12 is more reliable, even if the connecting piece 12 is stressed, the connection strength between the connecting piece and the connecting piece is increased compared with the connecting piece which is in a standard circular shape; in addition, the surface of the plastic can be provided with a concave-convex structure, and the connection strength of the plastic and the plastic can be increased after injection molding. The movable assembly 15 of the throttling element 10 comprises a magnetic rotor component 151, a screw rod component 153 and a valve core 152, wherein the magnetic rotor component 151 is fixedly or in transmission connection with the screw rod component 153, and the magnetic rotor component 151 can drive the screw rod component 153 to rotate at least in a set range, so that the valve core 152 is driven to move up and down in a certain range. In this application, the case lead screw subassembly includes lead screw part 153, case 152, and lead screw part and case fixed connection or spacing connection or transmission connection, of course, in other embodiments, lead screw part 153 and case 152 can integrated into one piece, and the case lead screw subassembly includes two parts: a lead screw member 153 and a valve core 152. The screw member 153 has an external screw portion 1531, the fixing unit 14 includes an internal screw portion 1412 that mates with the external screw portion 1531 of the screw member 153, the external screw portion 1531 of the screw member 153 mates with the internal screw portion 1412 of the fixing unit 14, and specifically, the plastic part 141 of the present embodiment includes a nut portion 143 and a body portion 144, and the internal screw portion 1412 is the nut portion 143 of the plastic part 141. The magnetic rotor component 151 and the like of the movable assembly 15 can rotate relative to the fixed assembly 14 and can realize up-and-down movement of a set range through the set of thread combinations, and the valve core and the like of the movable assembly 15 can move up and down within a certain range, so that the valve core 152 moves towards the direction of the expanding part 1403 close to the valve opening 140 or moves away from the expanding part 1403 of the valve opening 140 to adjust the through flow sectional area of the valve opening part after the valve core is matched with the valve opening 1400, thereby adjusting the through flow of the refrigerant through the valve opening 1400 in use. The part of the plastic part, which is matched with the connecting piece and is matched and connected with the valve body, is defined as a main body part, the part provided with the internal thread part 1412 in the embodiment is a nut part, the plastic part comprises the main body part and the nut part, the external thread part is positioned on the main body part of the plastic part, the connecting piece is positioned on one side of the external thread part of the plastic part, and the side hole is positioned on the other side of the external thread part of the plastic part.

The fixing assembly 14 comprises a connecting piece 12 and a plastic piece 141, wherein the connecting piece 12 comprises a step part 121, a connecting and matching part 122 and a fixing reinforcing part 123, and the step part 121 is used for being matched and connected with the sleeve; the connecting and matching part 122 is positioned on the outer wall part of the connecting piece, and is used for a stress structure when the throttling element is fixedly connected with the valve body part or the throttling element is fixedly connected with the system, the outer contour of the connecting and matching part can be suitable for the force of assembling tools such as a spanner, the outer shape of the section of the connecting and matching part can be square, hexagonal, quincuncial or irregular round with parallel opposite sides for stress, and the like; the fixing reinforcement portion 123 is located at an inner wall portion of the connecting piece to improve the fixing connection strength with the plastic piece 141, the fixing reinforcement portion 123 may be disposed at any portion of the inner side of the connecting piece, which is matched with the plastic piece, and the fixing reinforcement portion 123 makes the shape of the inner side portion of the fixing reinforcement portion be a non-standard circle or the contact portion of the connecting piece and the plastic piece be a non-standard plane. The inner side wall and/or the mating surface of the connecting piece are/is defined as a fixing reinforcement portion, for example, the fixing reinforcement portion is arranged on the inner side wall, the inner side wall can be quincuncial, square, hexagonal, etc., namely, the inner side wall has a concave-convex structure relative to a round shape, or the connecting piece can be provided with a concave-convex structure on one surface, for example, the connecting piece can be arranged on the surface contacting with the plastic piece, so that the surface has a concave-convex structure, the fixing reinforcement portion is covered by the plastic piece, or at least part of the fixing reinforcement portion is covered by the plastic piece, so that the connecting strength with the plastic piece can be increased, and the purpose of the invention is achieved.

The plastic member 141 includes an external thread portion 1411 relatively close to the valve port, a limiting portion 1413, and an internal thread portion 1412 relatively close to the limiting portion 1413, wherein the external thread portion 1411 is relatively close to the valve port, the limiting portion 1413 is relatively far away from the valve port, the internal thread portion 1412 is relatively close to the limiting portion 1413, and the external thread portion 1411, the limiting portion 1413 and the internal thread portion 1412 are of an integral structure formed by injection molding, so that the number of parts can be reduced, the processing procedures can be reduced, and the consistency can be relatively improved. The limiting part 1413 protrudes from the body part of the plastic part to be used as a limiting structure when moving to the stroke, and can specifically protrude upwards or protrude outwards in the radial direction; the plastic member 141 has a fitting portion 1404 that fits with the fixing reinforcement portion 123 of the connecting member, and accordingly, the fitting portion 1404 corresponds to the position of the fixing reinforcement portion of the connecting member, for example, may be located at an inner wall portion of the plastic member or may be located at a surface contacting the connecting member, and is shaped to fit with the fixing reinforcement portion of the connecting member, and is integrally formed at the time of injection molding.

The valve portion 140 has a valve port 1400, at least one side hole 1401, a flared portion 1403, and a recess 1402, the valve portion 140 is fixedly connected to the plastic member 141, such as by screwing or tightly fitting, at least a portion of the valve portion 140 extends into the plastic member and is fitted to an inner wall portion of the plastic member, the side hole 1401 is close to the connecting member with respect to the valve port 1400, the side hole 1401 may be one or two, or even three or four, and the embodiment shown in the figure is specifically 4. The flared portion 1403 is located on the other side of the valve port 1400, the flared portion 1403 is relatively farther from the connector than the valve port 1400, and the recess 1402 serves to limit the second seal 52, thereby providing a relative seal between the valve port and the valve body component or system. In one embodiment, the plastic member includes a second internally threaded portion, and the valve port 140 has an externally threaded portion that mates with the second internally threaded portion, the valve port threadably mating with the plastic member. In another embodiment, the valve opening is in close fit with the plastic part to achieve relative fixation.

The throttling element, when assembled, may comprise the steps of:

the processing of the connecting piece, the connecting piece includes the step part, connects the mating part, fixes the reinforcement part;

injection molding, wherein the connecting piece is used as an insert to form a plastic piece through injection molding, and a plastic piece and connecting piece integrated assembly is formed, wherein the plastic piece assembly is defined as a plastic piece assembly, the plastic piece assembly comprises a plastic piece and a connecting piece, and the plastic piece covers part of the connecting piece, such as the inner side wall of the connecting piece in the embodiment; the plastic piece has an external screw portion 1411, an engaging portion 1404 engaged with the fixing reinforcing portion; the internal thread portion 1412, the external thread portion 1411 and the mating portion 1404 are directly formed during injection molding, or the external thread portion 1411 is formed by machining, the main body portion of the plastic member 141 is formed by injection molding, and then the external thread portion 1411 is formed by machining; the external thread 1411 is a plastic material;

assembling a screw rod valve core assembly, namely assembling an assembly formed by integrating a plastic piece and a connecting piece with the screw rod valve core assembly, wherein the screw rod component is in threaded fit with an internal thread part 1412 of the plastic piece;

the valve opening and the magnetic rotor assembly can be assembled sequentially or synchronously, and the valve opening and the magnetic rotor assembly can be assembled first.

And providing a sleeve, and welding and fixing the connecting piece of the fixing assembly with the sleeve. Welding the sleeve and the connecting piece is performed after assembling the magnetic rotor assembly; the sleeve is welded and fixed with the sleeve, in particular, the sleeve is matched and assembled with the step part of the connecting piece, for example, the sleeve is fixed and sealed through laser welding.

The assembly of the valve portion may also be performed after the sleeve is welded.

In the case of a throttle valve, the method further comprises the following steps on the basis of the throttle element:

a throttle element, a valve body member, and a seal are provided, the seal is placed in a corresponding portion such as a recess, a portion of the first seal is positioned in the recess, and the throttle element and the valve body member are fixed by screw connection. Specifically, the seal may include a first seal 51, a second seal 52, with the first seal 51 partially located in a recess of the valve body member toward the fixing assembly or a recess of the fixing assembly toward the valve body member, and the second seal 52 partially located in a recess of an outer wall portion of the valve mouth or a recess of an inner wall portion of the valve body member;

assembling a coil component, providing the coil component, and assembling the coil component and the throttling element;

the assembly of the coil component and the throttle element may be performed after or before the assembly of the throttle element and the valve body component, and the assembly of the coil component may further require fixing screws, stoppers, or the like.

In a specific embodiment, the throttling element, when assembled, may comprise the steps of:

the processing of the connecting piece, the connecting piece includes the step part, connects the mating part, fixes the reinforcement part; the connecting piece is formed by machining a hexagonal section bar, the inner contour of the inner side wall is at least partially plum blossom-shaped, and the outer contour of the connecting matching part is hexagonal; the quincuncial shape of the inner side wall is formed by stamping or forging.

Injection molding, namely performing injection molding processing by taking the connecting piece as an insert to form an integrated assembly of the plastic piece and the connecting piece; the plastic piece is provided with an internal thread 1412, an external thread 1411 and a matching part 1404, wherein the internal thread 1412, the external thread 1411 and the matching part 1404 are directly formed when injection molding is carried out; the outer side of the connecting matching part of the connecting piece is exposed out of the plastic piece, and the fixing reinforcing part of the connecting piece is matched and fixed with the plastic piece; the external thread 1411 may be formed by machining, the main body of the plastic member 141 is injection molded, and the external thread 1411 is formed by machining; the external thread 1411 is a plastic material;

assembling a screw rod valve core assembly, namely assembling an assembly formed by integrating a plastic piece and a connecting piece with the screw rod valve core assembly, wherein the screw rod component is in threaded fit with an internal thread part 1412 of the plastic piece;

The two steps of assembling the valve opening part and the magnetic rotor assembly can be carried out sequentially or synchronously, the valve opening part can be assembled firstly or the magnetic rotor assembly can be assembled firstly or synchronously, the valve opening part and the plastic piece are fixed, and the magnetic rotor assembly and the screw rod component are fixed; before assembling the valve opening, the second seal 52 may be disposed in the recess 1402 of the valve opening; the fixing mode of the valve opening part and the plastic part comprises threaded connection or tight fit connection or bonding by combining glue; the magnetic rotor assembly and the screw rod component can be fixed by welding, riveting or crimping.

And providing a sleeve, and welding and fixing the connecting piece of the fixing assembly with the sleeve. Welding the sleeve and the connecting piece is performed after assembling the magnetic rotor assembly;

in addition, the assembly of the valve opening part can be carried out after the sleeve is welded, and some parts can be adjusted, for example, in another embodiment of the throttling element, the connecting piece is made of metal materials and comprises a step part, a connecting matching part and a fixing reinforcing part; the connecting piece is formed by forging or stamping and combining machining, the connecting matching part is provided with a stress structure, and the fixing reinforcing part is provided with a matching reinforcing structure, such as a matching structure of a non-standard plane of a non-standard circular work. And assembling a screw rod valve core assembly, assembling a magnetic rotor assembly after assembling an assembly formed by integrating a plastic piece and a connecting piece with the screw rod valve core assembly, welding and fixing a sleeve and the connecting piece, and then assembling a valve opening. The assembly valve portion may also include assembly of a seal.

In the case of a throttle valve, the assembly of the throttle element and the valve body part and the assembly of the coil part are further included on the basis of the throttle element. The assembly process further includes a seal member, and the seal member may include a first seal member 51 and a second seal member 52, wherein the first seal member 51 is partially positioned in a recess of the valve body member facing the fixing unit or a recess of the fixing unit facing the valve body member, and the second seal member 52 is partially positioned in a recess of an outer wall portion of the valve opening or a recess of an inner wall portion of the valve body member. The fixing component and the sleeve are welded and fixed, specifically, the sleeve and the step part of the connecting piece are assembled in a matched mode and welded, and fixing and sealing are achieved through laser welding. The plastic material may in particular be a special engineering plastic or a 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.

In order to fix the fixing component and the sleeve by welding, the plastic part is relatively less influenced, the welding can be performed by adopting a welding mode such as laser welding and the like with relatively less influence on materials, and in addition, some improvements can be made on the structure of the connecting piece, as shown in fig. 7, fig. 7 is a schematic cross-sectional view of another embodiment of the fixing component. The connecting piece is also provided with the notch 125 in the inboard of step 121, and when welding the sleeve pipe, notch 125 is located between working of plastics and step, because the existence of notch, when connecting piece and sleeve pipe welded fastening, the heat that transfers to the working of plastics when can reduce the welding relatively, improves the heat influence of welding to the working of plastics. Other structures of this embodiment may be described with reference to the above embodiments.

The fixed assembly or the throttle element can also be other embodiments, and referring to fig. 8-11, fig. 8 is a schematic cross-sectional view of a second embodiment of the throttle valve, fig. 9 is a schematic cross-sectional view of the throttle element of the throttle valve, which is a structure of the throttle valve before assembling the valve body component and the coil component, etc., the throttle element can be directly assembled with the system without the valve body component, which is more beneficial to miniaturization; fig. 10 is a perspective view of a fixed assembly of the throttle valve, and fig. 11 is a sectional view of the fixed assembly of the throttle valve.

The throttle valve comprises a throttle element 10a, a coil part 13 and a valve body part 11, wherein the valve body part 11 is provided with a first connector 111 and a second connector 112, the valve body part 11 is provided with a valve cavity 110, the first connector 111 and the second connector 112 are respectively communicated with two parts of the valve cavity, the part of the first connector 111 communicated with the valve cavity is relatively close to the bottom of the valve cavity, and the part of the second connector 112 communicated with the valve cavity is relatively far away from the bottom of the valve cavity. The throttle element 10a is partially positioned in the valve cavity, the throttle element 10a is in threaded connection with the valve body part 11, a concave recess is formed in the end face of one of the throttle element 10a and the valve body part 11, a first sealing piece 51 is arranged on the end face of the valve body part, the concave recess can be positioned at the end face of the valve body part or at the connecting piece of the throttle element, and the concave recess is formed so that the matching part of the throttle element 10a and the valve body part 11 can realize sealing. After the valve body part 11 is assembled with the throttling element 10a, a cavity near one side of the bottom of the valve body is defined as a first cavity 1101 by taking the position of the valve port as a boundary, a cavity near the other side of the bottom of the valve body is defined as a second cavity 1102, the first cavity 1101 is communicated with the first interface 111, the second cavity 1102 is communicated with the second interface 112, the first cavity 1101 and the second cavity 1102 can be communicated through the valve port 1400, and the adjustment of the refrigerant through-flow can be realized by adjusting the through-flow sectional area of the valve port part; in the case where the throttling element is capable of closing, there may be a situation in which the first chamber 1101 and the second chamber 1102 are not in communication.

The valve body member 11 has the female screw portion 113, the female screw portion 113 is screw-engaged with the male screw portion 1411 of the throttle element 10a, the valve body member 11 has the engaging portion 114 engaged with the valve port engaging portion 145 of the throttle element 10a, and both are engaged with the second seal 52 to seal, so that the second chamber and the first chamber do not leak from the engaging portion therebetween or the amount of leakage from the engaging portion therebetween is reduced. The throttle valve has a first seal 51 and a second seal 52, the valve body member 11 and the throttle element 10a have a connection fitting portion and a valve port fitting portion, a recess, a step portion, or the like may be provided in at least one of the fitting portions of the valve body member 11 and the throttle element 10a to limit the seal, the throttle element 10a and the valve body member 11 are sealed by the seal fitting, the connection fitting portion of the valve body member 11 and the throttle element 10a has an end face seal structure, and the seal between the valve body member 11 and the throttle element is realized by providing a recess in one of the end faces and providing the first seal 51 in the recess limit. The valve body 11 can be arranged independently or combined with the components of the system, such as the matched internal thread 113 and the valve cavity are arranged on the runner plate, thus the valve body is not required to be arranged independently, and the valve body can be communicated with other components conveniently through the runner.

The throttle element 10a has an external screw portion 1411 screw-engaged with the internal screw portion 113 of the valve body member 11. The throttle element 10a and the valve body part 11 are sealed by a first sealing element 51 at the end face, and sealed by a second sealing element 52 at the valve port matching position. The throttling element 10a comprises a sleeve 18, a movable assembly 15 and a fixed assembly 14a, wherein the sleeve 18 is fixedly connected with the fixed assembly 14a through welding. The fixing assembly 14a includes a connecting member 12, a valve port 140a, a plastic member 141a formed by injection molding with the connecting member 12 as an insert, a nut 146, the nut 146 having an internal thread portion engaged with the external thread portion of the screw member, the plastic member 141a and the nut 146 being fixed by a tight fit or by a screw connection or by a tight fit bonding glue. In this embodiment, the fixing assembly 14a includes a plastic component including the connecting member 12 and the plastic member 141a, and the nut 146. The valve port 140a is located inside the valve port fitting 145, and the valve port fitting 145 has a stopper 1451 to limit the valve port 140 a. The material of the connecting piece 12 is a metal material, the sleeve 18 is fixed with the connecting piece 12, such as by welding, the connecting piece 12 is a stress piece used for threaded connection, the connecting piece 12 is provided with a stress structure for fixing or connecting, the external outline of the connecting piece can be suitable for the force of an assembling tool such as a wrench, the cross section of the external outline can be square, hexagonal, quincuncial or irregular round with parallel opposite sides used for stress, and the like. In order to ensure that the plastic member 141a is reliably connected and fixed with the connecting member 12, the inner side wall of the connecting member 12 is provided with a fixing reinforcing part 123, and specifically, the inner side wall can be of a non-standard circular structure, for example, the inner side shape of the section of the inner side wall can be square, hexagonal or irregular circular or quincuncial with partial straight edges, and the like, and can also be adjusted on the basis of the circular structure to be of a non-standard circular structure, for example, a concave-convex structure is arranged when the circular structure is used as the fixing reinforcing part, so that the connection of the two parts is more reliable, and even if the connecting member 12 is stressed, the connection strength between the two parts is increased compared with that when the connecting member is of a standard circular shape; in addition, a concave-convex structure can be arranged on a certain surface of the combination, so that the connection strength of the concave-convex structure and the plastic can be increased after injection molding. The plastic member 141a includes a main body portion 144, a nut engaging portion 147 and a valve port engaging portion 145, in this embodiment, the main body portion 144 includes a portion engaged with the connecting member, a portion where the external thread portion 1411 is provided, and the valve port engaging portion 145 includes a portion engaged with the valve port portion 140a and a portion where the side hole 1401 is provided, where the main body portion 144, the nut engaging portion 147 and the valve port engaging portion 145 are in an integrally injection-molded structure, and are mainly distinguished for convenience of description. The side hole of the present embodiment may be located between the valve portion and the male screw portion, or may be partially located between the valve portion and the male screw portion. In addition, the valve port part can also be used as a part of the plastic component, namely, the connecting piece and the valve port part are used as injection molding inserts together, the plastic component is formed into the plastic component through injection molding, the plastic component forms a valve port matching part, the outer side part of the valve port part is covered by the plastic component, and the inner side part of the valve port part is exposed out of the plastic component.

The movable assembly 15 of the throttling element 10a comprises a magnetic rotor component 151, a screw rod component 153 and a valve core 152, wherein the magnetic rotor component 151 is fixedly or in transmission connection with the screw rod component 153, and the magnetic rotor component 151 can drive the screw rod component 153 to rotate at least in a set range, so that the valve core 152 is driven to move up and down in a certain range. Fixed in this context includes both direct and indirect, as well as direct and indirect. The screw member 153 has an external screw portion 1531, the fixing assembly 14a includes an internal screw portion 1412 that mates with the external screw portion 1531 of the screw member 153, the external screw portion 1531 of the screw member 153 is screw-mated with the internal screw portion 1412 of the fixing assembly 14a, and specifically, the internal screw portion 1412 is provided at the nut 146. The nut can be made of metal or plastic materials such as PEEK or PPS, the nut and the plastic parts can be connected in a tight fit manner, or in a threaded manner, or in a tight fit manner, or in a fixed manner by combining glue, and the nut and the plastic parts can be fixed in a plastic welding manner when the nut is made of plastic materials. The magnetic rotor component 151 of the movable assembly 15 can rotate relative to the fixed assembly 14a and can realize up-and-down movement of a set range through the set of thread combinations, and the valve core of the movable assembly 15 can move up and down within a certain range, so that the valve core 152 moves towards the valve port or moves relatively away from the valve port, and the through flow cross section of the valve port part after the valve core is matched with the valve port 1400 is adjusted, so that the through flow of the refrigerant through the valve port 1400 in use is adjusted. The valve port fitting portion 145 is provided with a stepped portion as a stopper portion 1451 on the inner side wall to limit the valve port portion, and the valve port portion may be tightly fitted or tightly fitted and fixed in combination with curing of glue or the like. The valve port engaging portion 145 is provided with a recess 1402 on the outer side wall, the recess may be used as a stopper portion of a seal, and the seal may be provided in the recess, and in this embodiment, the side hole 1401, the male screw portion 1411, the stopper portion 1451, and the recess 1402 are directly formed when injection molding is performed.

The connecting piece 12 comprises a step part 121, a connecting and matching part 122 and a fixing reinforcing part 123, wherein the step part 121 is used for being matched with the sleeve to be connected or matched with the sleeve to be limited; the connecting and matching part 122 is positioned on the outer wall part of the connecting piece, and is used for a stress structure when the throttling element is fixedly connected with the valve body part or the throttling element is fixedly connected with the system, the outer contour of the connecting and matching part can be suitable for the force of assembling tools such as a spanner, the outer shape of the section of the connecting and matching part can be square, hexagonal, quincuncial or irregular round with parallel opposite sides for stress, and the like; the fixing reinforcement portion 123 is located at an inner wall portion of the connecting piece to improve the fixing connection strength with the plastic piece 141a, the fixing reinforcement portion 123 can be disposed at any portion of the inner side of the connecting piece, which is matched with the plastic piece, the fixing reinforcement portion 123 enables the inner side portion to be in a non-standard circular shape or the contact portion of the connecting piece and the plastic piece to be in a non-standard plane, and the fixing reinforcement portion 123 is matched with the matched portion of the plastic piece after injection molding to improve the connection strength. The inner side wall and/or the mating surface of the connecting piece are/is defined as fixing reinforcement part, for example, the inner side wall is arranged on the inner side wall, the inner side wall can be quincuncial, square, hexagonal, etc., or the connecting piece can be provided with concave-convex structure on one surface, for example, the connecting piece can be arranged on the surface contacting with the plastic piece, so that the surface has concave-convex structure, and the purpose of the invention can be realized.

The plastic member 141a includes a recess 1402, a side hole 1401, a stepped stopper portion 1451, and an external screw portion 1411, wherein the stopper portion 1413 and an internal screw portion 1412 relatively close to the stopper portion 1413 are provided on the nut 146, the recess 1402, the side hole 1401, and the stepped stopper portion 1451 of the valve port mating portion are provided on the valve port mating portion, the external screw portion 1411 is relatively close to the connecting member, the stopper portion 1413 is relatively far from the valve port portion, and the internal screw portion 1412 is relatively close to the stopper portion 1413. The plastic member 141a has a fitting portion 1404 to be fitted with the fixing reinforcement portion 123 of the connection member, and accordingly, the fitting portion 1404 corresponds to the position of the fixing reinforcement portion of the connection member, for example, may be located at an inner wall portion of the plastic member or may be located at a surface contacting the connection member, and is shaped to fit with the fixing reinforcement portion of the connection member, and is integrally formed at the time of injection molding.

The valve port portion 140a has a valve port 1400, and the valve port portion 140a is fixedly connected with the plastic member 141a, for example, by tightly fitting or tightly fitting with glue, and then is combined with the setting of the limit portion 1451. The valve portion 140a extends into the inner cavity of the plastic member and is matched with the inner wall portion of the plastic member, the side hole 1401 is relatively close to the connecting member than the valve port 1400, the inner wall portion A in the direction from the limiting portion 1451 to the connecting member is larger than the inner wall portion B on the side, away from the connecting member, of the limiting portion 1451, or the inner wall portion A, relatively close to the connecting member, of the plastic member is larger than the inner wall portion B on the side, relatively away from the connecting member, of the plastic member. Thus, when in use, the valve port part can still be well limited even if being influenced by the refrigerant and the like. Recess 1402 serves as a stop for second seal 52, thereby providing a relative seal between the valve port mating portion and the valve body member or system. In one embodiment, the plastic part may further include a second internal threaded portion located at the nut engaging portion, the nut having an external threaded portion engaged with the second internal threaded portion, the nut being threadedly engaged with the plastic part.

The assembly of the throttling element of this embodiment comprises the following steps:

processing a connecting piece, wherein the connecting piece is made of metal materials and comprises a step part, a connecting matching part and a fixing reinforcing part; the connecting and matching part is provided with a stress structure, and the fixing and reinforcing part is provided with a matching and reinforcing structure, such as a matching structure of a non-standard plane of a non-standard circular work; the connector may be forged or stamped and formed in combination with machining, or the connector may be machined from a profile such as a hexagonal profile;

injection molding, namely performing injection molding processing by taking the connecting piece as an insert to form an integrated assembly of the plastic piece and the connecting piece; the plastic piece comprises a main body part, a valve port matching part and a nut matching part; the plastic member has an external screw portion 1411, a side hole 1401, a recess 1402, and a stopper 1451, and the external screw portion 1411, the side hole 1401, the recess 1402, and the stopper 1451 are directly formed when injection molding is performed; the outer side of the connecting matching part of the connecting piece is exposed out of the plastic piece, and the fixing reinforcing part of the connecting piece is matched and fixed with the plastic piece;

assembling the valve opening part, providing a valve opening part 140a, putting the valve opening part into the inner cavity of the plastic piece from one side of the nut matching part, and enabling the valve opening part and the valve opening matching part to be matched and limited or fixed;

Assembling a screw valve core assembly and a nut, providing a nut 146 and the screw valve core assembly, assembling the nut 146 and the screw valve core assembly, and matching the screw component with an internal thread 1412 of the nut in a threaded manner;

the assembly formed by the screw rod valve core assembly and the nut is assembled and fixed with the plastic part assembled with the valve port part, in particular, the nut is assembled and fixed with the nut matching part of the plastic part, the fixing mode can be tight fit or threaded connection, and in addition, the assembly can be combined with glue for solidification bonding at the same time of tight fit or the assembly can be combined with glue for solidification bonding at the same time of threaded connection, so that the connection reliability can be improved; then the assembled assembly and the magnetic rotor assembly are assembled together, in particular, the magnetic rotor assembly and the screw rod component are fixed, and the fixing of the magnetic rotor assembly and the screw rod component can be welding, riveting or crimping; assembling the movable assembly and the fixed assembly, providing the movable assembly, assembling the movable assembly and the fixed assembly, and connecting the external thread part of the screw rod part with the internal thread part of the nut in a threaded manner; or:

the assembly formed by the screw rod valve core assembly and the nut is assembled with the magnetic rotor assembly, in particular to fix the magnetic rotor assembly and the screw rod component, and the fixing of the magnetic rotor assembly and the screw rod component can be welding, riveting or crimping; then assembling the plastic component with the valve opening part assembled, wherein the plastic component comprises a connecting piece and the valve opening part; the nut and the nut matching part of the plastic piece are assembled and fixed in a tight fit or threaded connection mode, and the nut matching part of the plastic piece can be combined with glue for solidification bonding at the same time of tight fit or glue for solidification bonding at the same time of threaded connection, so that the connection reliability can be improved; then the assembled assembly is assembled;

Providing a sleeve, welding and fixing the assembled assembly and the sleeve, wherein the sleeve is made of metal material, such as stainless steel, and welding and fixing a connecting piece of the fixed assembly and the sleeve. The assembly of the throttle valve may be as described above with reference to the first embodiment.

The assembly of the throttling element of this embodiment may also be performed as follows:

processing a connecting piece, wherein the connecting piece is made of metal materials and comprises a step part, a connecting matching part and a fixing reinforcing part; the connecting and matching part is provided with a stress structure, and the fixing and reinforcing part is provided with a matching and reinforcing structure, such as a matching structure of a non-standard plane of a non-standard circular work; the connector may be forged or stamped and formed in combination with machining, or the connector may be machined from a profile such as a hexagonal profile;

injection molding, namely performing injection molding processing by taking the connecting piece as an insert to form an integrated assembly of the plastic piece and the connecting piece; the plastic piece comprises a main body part, a valve port matching part and a nut matching part; the plastic member has an external screw portion 1411, a side hole 1401, a recess 1402, and a stopper 1451, and the external screw portion 1411, the side hole 1401, the recess 1402, and the stopper 1451 are directly formed when injection molding is performed; the outer side of the connecting matching part of the connecting piece is exposed out of the plastic piece, and the fixing reinforcing part of the connecting piece is matched and fixed with the plastic piece;

Assembling the valve opening part, providing a valve opening part 140a, putting the valve opening part into the inner cavity of the plastic piece from one side of the nut matching part, and enabling the valve opening part and the valve opening matching part to be matched and limited or fixed;

assembling a screw rod component and a nut, providing a nut 146 and a screw rod component, assembling the nut 146 and the screw rod component, and matching the screw rod component with an internal thread 1412 of the nut in a threaded manner; then other parts of the screw rod valve core assembly such as the valve core and the elastic element are assembled to form an assembly part for assembling the screw rod valve core assembly and the nut, namely the screw rod valve core assembly is assembled after the screw rod part and the nut are assembled;

the steps of assembling the plastic component with the valve opening part and the connecting piece, assembling the sleeve and the like can be referred to above.

In addition, the valve port part can also be used as an insert, and the insert and the connecting piece are subjected to injection molding to form a plastic component, wherein the plastic component comprises the valve port part, the connecting piece and the plastic piece.

The nut can also be a plastic piece and is formed by injection molding; the nut has a female screw 1412 and a stopper 1413, and the female screw 1412 and the stopper 1413 are directly formed at the time of injection molding. The connection between the nut and the plastic piece can be realized by a threaded connection or a tight fit connection mode, and can also be simultaneously matched with a glue bonding mode.

The throttle valve and the throttle element may also be as shown in fig. 12, fig. 12 is a schematic cross-sectional view of a third embodiment of the throttle valve, which is different from the second embodiment mainly in that the nut is matched with the plastic part, and other structures of the throttle valve may refer to the above second embodiment, and fig. 10 and 11. In one embodiment, the throttle valve comprises a throttle element 10b, a valve body part 11 and a coil part 13, the throttle element 10b comprises a fixed component 14b, a movable component 15 and a sleeve 18, the fixed component 14b comprises a nut 146a, a plastic part 141b and a valve port part 140a, the plastic part 141b is fixed with the valve port part 140a, the nut 146a and the plastic part 141b adopt a threaded connection mode, the nut 146a and the plastic part 141b are provided with threaded connection parts, the threaded connection parts are provided with reverse locking structures, the nut is reversely loosened due to the stress of the nut when the screw rod part acts, the nut 146a is provided with an external thread part 1461, the plastic part 141b is provided with an internal thread part 1415, meanwhile, the nut 146a and the plastic part 141b are also provided with guide matching structures, the guide matching structures can be in the position of the threaded connection structures, which are biased towards the valve port part, the position of the threaded connection structures can be relatively far away from the valve port part, the guide matching structures are in a small clearance fit, the nut 146a is provided with a guide matching part 146, and the plastic part 141b is provided with a guide part 6, so that the coaxiality between the nut and the plastic part can be relatively assembled more conveniently. The small gap of the guiding matching structure can be controlled between 0.05mm and 0.2mm, so that the guiding matching structure and the guiding matching structure have better coaxiality and can be controlled between 0.05mm and 0.12 mm. In addition, besides the threaded connection between the nut 146a and the plastic member 141b, the adhesive bonding may be also used, so that a reverse locking structure and a guiding matching structure are not needed, and the nut 146a and the plastic member 141b can be relatively well connected and have good coaxiality. In addition, the nut 146a and the plastic member 141b may be fixed by plastic welding, and the nut is also an injection molded member, and the two members are fixedly connected by ultrasonic welding or the like.

The processing process of the throttle valve comprises the following steps:

processing a connecting piece, wherein the connecting piece is made of metal materials and comprises a step part, a connecting matching part and a fixing reinforcing part; the connecting and matching part is provided with a stress structure, the fixing and reinforcing part is provided with a matching and reinforcing structure, and the matching and reinforcing structure is a non-standard round or non-standard plane matching structure, for example, the inside of the connecting and matching part is provided with a local plum blossom shape or a hexagon shape or a concave-convex part is arranged on a round basis; the connector may be forged or stamped and formed in combination with machining, or the connector may be machined from a profile such as a hexagonal profile; the other is formed by machining a profile, wherein the profile is in a hexagonal shape, the inner hole is in a plum blossom shape or a polygonal shape, and the profile has a non-circular structure such as pentagon, hexagon, octagon and the like.

Injection molding, namely performing injection molding processing by taking the connecting piece 12 as an insert to form an integrated component of the plastic piece and the connecting piece, wherein the injection molded component is defined as a plastic piece component; the plastic member includes a main body portion 144, a valve port mating portion 145, and a nut mating portion 147; the plastic part is provided with an external thread 1411, a side hole 1401, a concave part 1402 and a limit part 1451 for being matched and limited with the valve port, wherein the external thread 1411, the side hole 1401, the concave part 1402 and the limit part 1451 are directly formed when injection molding is performed; the outer side of the connection matching part 122 of the connecting piece is exposed out of the plastic piece, and the fixing reinforcing part of the connecting piece is matched and fixed with the plastic piece; the plastic member has an external screw portion 1411, a side hole 1401, a recess 1402, and a stopper 1451, and the external screw portion 1411, the side hole 1401, the recess 1402, and the stopper 1451 are directly formed when injection molding is performed; the outer side of the connecting matching part of the connecting piece is exposed out of the plastic piece, and the fixing reinforcing part of the connecting piece is matched and fixed with the plastic piece;

Assembling the valve opening, providing a valve opening part 140a, putting the valve opening part into the inner cavity of the plastic piece from one side of the nut matching part, enabling the valve opening part and the valve opening matching part to be matched and limited or fixed, and enabling the valve opening part to be limited through a limiting part 1451;

assembling a screw rod valve core assembly and a nut; providing a screw rod valve core assembly and a nut, and connecting the screw rod valve core assembly and the nut through threads, wherein the assembled assembly is defined as a screw rod valve core nut assembly;

after the screw rod valve core nut component, the plastic part component and the valve port part are assembled, the two components are assembled, the nut 146a and the nut matching part 147 of the plastic part are assembled and fixed, the fixing mode can be threaded connection, and in addition, glue can be combined for solidification and bonding at the same time of threaded connection, and a guide structure is matched, so that the assembly is convenient, and the connection reliability can be improved; then, assembling the magnetic rotor assembly, so that the magnetic rotor assembly 151 is fixed with the screw rod component of the screw rod valve core nut assembly, wherein the fixing mode of the magnetic rotor assembly and the screw rod component can be welding, riveting or crimping, or even can be combined, such as welding after crimping or welding after riveting;

in addition, after the screw mandrel nut component, the plastic component and the valve port part are assembled, the magnetic rotor component is assembled first, so that the magnetic rotor component 151 and the screw mandrel component of the screw mandrel nut component are fixed, and the magnetic rotor component and the screw mandrel component can be fixed in a welding, riveting or pressing mode, or even can be combined, such as welding after pressing or welding after riveting; then, the plastic component is assembled, the nut 146a and the nut matching part 147 of the plastic component are assembled and fixed, the fixing mode can be threaded connection, and the adhesive can be combined for solidification and bonding at the same time of threaded connection, so that the assembly is convenient by matching with the guide structure, and meanwhile, the connection reliability can be improved;

The sleeve 18 is then assembled to provide a sleeve to which the connector of the securing assembly is welded.

Thus, the movable component, the fixed component, the sleeve and the like are assembled.

In addition, the valve port part can also be used as an insert, and the insert and the connecting piece are processed together through injection molding to form a plastic part assembly, and the plastic part assembly comprises the valve port part, the connecting piece and the plastic part, so that the valve port part and the plastic part are connected more reliably.

In addition, as shown in fig. 13, fig. 13 is a partially enlarged schematic cross-sectional view of still another embodiment of the throttle valve, which is an improvement on the first embodiment, and only shows the difference from the first embodiment, the difference from the first embodiment is that the mating portion of the valve opening and the valve body member is that the mating portion of the valve body member with the valve opening further has a stepped portion 115, and the valve opening is provided with a limit portion 1405 at a corresponding portion, the limit portion can limit the valve opening downward, the limit portion 1405 and the stepped portion 115 do not necessarily have a certain gap, if a portion d above the limit portion is slightly smaller than a portion c corresponding to the position below the limit portion, and a portion e above the limit portion is greater than a portion c corresponding to the position below the limit portion, or a portion of the valve opening 140 away from the limit portion toward the lead screw member is smaller than a portion 140 toward the direction from the limit portion toward the lead screw member. Therefore, when the valve opening part or the fixing component is used, even if the valve opening part is subjected to the action of the downward refrigerant pressure difference, the valve opening part can still be well limited, even if the valve opening part is not well fixed with a plastic part, the valve opening part can not fall down, the whole function can not be influenced, and other structures of the embodiment can refer to the first embodiment and are not repeated here.

A throttle element, a valve body member, and a seal are provided, the seal is placed in a corresponding portion such as a recess, a portion of the first seal is positioned in the recess, and the throttle element and the valve body member are fixed by screw connection.

It should be noted that: the above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention may be modified or equivalent or cross-combined, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention are intended to be covered by the scope of the claims of the present invention.

Claims (11)

1. The throttling element comprises a sleeve, a movable assembly and a fixed assembly, wherein the sleeve is fixedly connected with the fixed assembly, and the movable assembly is in threaded fit with the fixed assembly; the fixing assembly comprises a plastic part assembly and a nut, wherein the plastic part assembly comprises a connecting piece and a plastic part, the plastic part is provided with a main body part and a nut matching part, the sleeve is made of a metal material, the connecting piece is made of a metal material, and the sleeve and the connecting piece are fixed through welding; the plastic piece covers part of the connecting piece; the connecting piece is provided with a connecting matching part, and at least part of the outer side of the connecting matching part is exposed out of the plastic piece; the plastic part is provided with an external thread part and a side hole, the external thread part is formed by injection molding, the external thread part is positioned on the main body part of the plastic part, the connecting piece is positioned on one side of the external thread part of the plastic part, and the side hole is positioned on the other side of the external thread part of the plastic part.

2. A throttling element according to claim 1, characterized in that the plastic part has a valve port mating portion, the throttling element comprises a valve port portion having a valve port, the valve port mating portion is mated with the valve port portion and fixedly arranged or limitedly arranged, the side hole is located between the valve port portion and the external thread portion or at least partially located between the valve port portion and the external thread portion in an axial direction, and the plastic part assembly is formed by injection molding the connecting member.

3. The throttling element according to claim 1, characterized in that the plastic piece has a valve port mating portion, the plastic piece assembly includes a valve port portion having a valve port, the valve port mating portion mates with the valve port portion, the side hole is located between the valve port portion and the external threaded portion or at least partially between the valve port portion and the external threaded portion in an axial direction; the outer side of the valve port is covered by the plastic material, and the inner side of the valve port is exposed from the plastic material.

4. A throttling element according to any of the claims 1-3, characterised in that said nut is in a tight-fit or tight-fit fixation with said plastic component and has an adhesive fixation.

5. A throttling element according to any of the claims 1-3, characterized in that a threaded connection is provided between said nut and said plastic part assembly, said threaded connection further comprising a reverse locking structure or an adhesive fixation between said nut and said plastic part assembly.

6. A throttling element according to any of the claims 1-5, characterized in that said nut has a guiding engagement structure with a plastic member assembly, said nut having a guiding engagement portion, said plastic member having a guiding portion engaging with said guiding engagement portion.

7. A throttling element according to any of the preceding claims, characterized in that said plastic part is injection-molded, the insert being injection-molded comprising said connecting piece, said external thread being directly injection-molded; the movable assembly comprises a magnetic rotor component and a screw rod valve core assembly, the magnetic rotor component is fixedly connected or in transmission connection with the screw rod component of the screw rod valve core assembly, the screw rod component is provided with an external thread part, a nut of the fixed assembly comprises an internal thread part matched with the external thread part of the screw rod component, and the external thread part of the screw rod component is in threaded fit with the internal thread part of the fixed assembly; the connecting piece is provided with a fixed reinforcing part at the connecting part of the connecting piece, the plastic piece is provided with a matching part matched with the fixed reinforcing part, the matching part is formed by injection molding, and the fixed reinforcing part is at least partially covered by the plastic piece.

8. The throttling element of claim 7, wherein said connector includes a stepped portion, said sleeve and said connector being secured by laser welding, a mating weld of said sleeve and said connector including said stepped portion; the connecting piece is further provided with a notch part at the inner side of the step part, and the notch part is positioned between the plastic piece and the matched welding part of the step part.

9. The throttling element according to claim 7, characterized in that said connection is shaped as a profile, machined, the external profile of which is square, or hexagonal, or quincuncial; at least part of the inner side wall of the connecting piece is square, hexagonal, quincuncial or nonstandard round.

10. The throttling element according to claim 9, characterized in that the outer contour of the connection fitting of the connecting piece is hexagonal in shape, the portion of the fixing reinforcement of the connecting piece, which fits the plastic piece, is at least partially quincuncial, the outer shape of the profile of which the connecting piece is machined is hexagonal, and the inner shape is quincuncial.

11. A throttle valve comprising a valve body member having an internally threaded portion that mates with an externally threaded portion of the throttle member, a coil member, the valve body member being threadably connected to the throttle member; at least one of the valve body member or the throttling element has a recess at a location for mating with the other, and the throttle valve further includes a seal member that is confined to the recess.