CN218326233U

CN218326233U - Electronic expansion valve

Info

Publication number: CN218326233U
Application number: CN202222909219.6U
Authority: CN
Inventors: 黄鸿峰; 赵俊; 陈勇好; 姚坚
Original assignee: Zhejiang Dunan Artificial Environment Co Ltd
Current assignee: Zhejiang Dunan Artificial Environment Co Ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-01-17
Anticipated expiration: 2032-10-31

Abstract

The utility model provides an electronic expansion valve, it includes: a rotor body; the screw rod is coaxially arranged with the rotor body and is arranged on the rotor body in a penetrating way; injection molding and connecting piece, injection molding and connecting piece fixed connection, the periphery and the rotor body of connecting piece are connected, screw rod and injection molding butt fusion. Through the technical scheme that this application provided, can solve the screw rod that leads to and the cracked problem of connecting piece are connected to screw rod and connecting piece to the adoption welded mode among the prior art.

Description

Electronic expansion valve

Technical Field

The utility model relates to the technical field of valves, particularly, relate to an electronic expansion valve.

Background

The rotor assembly of the electronic expansion valve generally includes a rotor body and a connecting member, the connecting member is disposed in the rotor body, the electronic expansion valve further includes a screw, and at least a portion of the screw is disposed in the rotor body and fixedly connected to the connecting member. Under the normal condition, the screw rod passes through welded mode and connecting piece interconnect, but adopts the welded mode to be connected screw rod and connecting piece, and screw rod and connecting piece all have cracked risk, influence electronic expansion valve's life.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electronic expansion valve to solve the screw rod and the cracked problem of connecting piece that adopt welded mode to connect the screw rod and connecting piece that lead to among the prior art.

The utility model provides an electronic expansion valve, it includes: a rotor body; the screw rod is coaxially arranged with the rotor body and is arranged on the rotor body in a penetrating way; injection molding and connecting piece, injection molding and connecting piece fixed connection, the periphery and the rotor body of connecting piece are connected, screw rod and injection molding butt fusion.

Further, the injection molding is provided with first through hole, and the one end of screw rod is worn to establish in first through hole.

Further, the first through hole penetrates through the injection molding piece along the axis direction.

Further, the injection molding includes the first portion of moulding plastics and the second portion of moulding plastics that connect in order along the axis direction, and the diameter of the first portion of moulding plastics is greater than the diameter of the second portion of moulding plastics, and first wear to establish the hole is moulded plastics the portion by first portion of moulding plastics and is extended to the second portion of moulding plastics, and the one end of screw rod is moulded plastics the portion by first portion of moulding plastics and is stretched into to the second portion of moulding plastics and with the second portion butt fusion of moulding plastics through first wear to establish the hole.

Furthermore, a first limiting structure is arranged between the injection molding part and the screw rod, and the first limiting structure can limit the positions of the injection molding part and the screw rod in the axial direction; and/or the first limiting structure can limit the positions of the injection molding part and the screw rod in the circumferential direction.

Further, be provided with the internal thread in the first wear-out hole, the tip of screw rod is provided with the external screw thread, and the tip and the injection molding of screw rod pass through internal thread and external screw thread screw-thread fit connection, and internal thread and external screw thread form first limit structure.

Further, the screw rod with the global holding tank that is provided with of injection molding complex one end, the holding tank is used for holding the material after the injection molding thermal deformation, the holding tank forms first limit structure.

Further, the injection-molded part is welded to the connecting part.

Furthermore, a matching hole is formed in the connecting piece, a protruding portion is arranged on one side, close to the connecting piece, of the injection molding piece, one end, far away from the injection molding piece, of the protruding portion penetrates through the matching hole and protrudes out of the connecting piece to be arranged, and the protruding portion and the connecting piece are welded.

Further, injection molding and connecting piece set up in order along the axis direction of screw rod, and the injection molding is located the one side of keeping away from the screw rod of connecting piece, is provided with the second on the connecting piece and wears to establish the hole, the one end of screw rod pass the second wear to establish the hole and with the injection molding butt fusion.

Furthermore, an axial second limiting structure is arranged between the connecting piece and the screw rod to limit the positions of the screw rod and the connecting piece in the axial direction.

Further, the electronic expansion valve further includes: the screw is in threaded fit with the nut seat; the spiral track is annularly arranged on the periphery of the nut seat; the stop ring is movably arranged in the spiral track; the guide portion is connected with the injection molding piece in an integrated forming mode, the extending direction of the guide portion is the same as the extending direction of the screw rod and located on the outer side of the screw rod, and the guide portion is in driving connection with the stop ring so that the stop ring can slide in the spiral track.

Use the technical scheme of the utility model, through setting up the injection molding to make screw rod and injection molding butt fusion, can guarantee the structural strength of screw rod and connecting piece, guarantee electronic expansion valve's life. In the traditional technical scheme, the connecting piece and the screw rod are both made of metal materials and are connected in a welding mode, and in the welding process, the crystal shapes of the screw rod and the connecting piece are damaged and the situation of cracking easily occurs. In this scheme, screw rod and injection molding pass through the hot melt and connect, and the crystal state of screw rod is not destroyed in this process, and then can guarantee the structural strength of screw rod, guarantees electronic expansion valve's life.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of an electronic expansion valve provided by the present invention;

fig. 2 shows a schematic partial structure diagram of an electronic expansion valve provided by the present invention;

fig. 3 shows a schematic structural view of the injection molding part and the guide part provided by the present invention;

FIG. 4 shows a schematic view of the injection-molded part, the connecting part and one of the screw rod matching structures provided by the present invention;

FIG. 5 shows a schematic view of the structure of the injection-molded part, the connecting part and another screw rod provided by the present invention;

fig. 6 shows a schematic structural view of the rotor body and the connecting member provided by the present invention;

fig. 7 shows a top view of the rotor body and connector mating provided by the present invention;

fig. 8 is a schematic structural view showing one of the viewing angles of the injection-molded part and the guide part provided by the present invention;

fig. 9 shows a schematic structural diagram of another view angle of the injection molding part and the guide part provided by the present invention.

Wherein the figures include the following reference numerals:

10. a rotor body;

20. a screw; 201. accommodating grooves;

30. an injection molded part; 301. a first through hole; 302. a boss portion;

31. a first injection molding part; 311. a second lightening hole; 32. a second injection molding part;

40. a connecting member; 401. a mating hole; 402. a second through hole; 403. a first lightening hole; 404. a communicating hole;

50. a nut seat;

60. a spiral track;

70. a stop ring;

80. a guiding part.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides an electronic expansion valve, which includes a rotor body 10, a screw 20, an injection molding 30, and a connecting member 40. Wherein, the screw 20 is coaxially arranged with the rotor body 10, and the screw 20 is arranged on the rotor body 10 in a penetrating way; injection molding 30 and connecting piece 40, injection molding 30 and connecting piece 40 fixed connection, the periphery and the rotor body 10 of connecting piece 40 are connected, screw rod 20 and the butt fusion of injection molding 30.

Use the technical scheme of the utility model, through setting up injection molding 30 to make screw rod 20 and the butt fusion of injection molding 30, can guarantee screw rod 20 and connecting piece 40's structural strength, guarantee electronic expansion valve's life. In the traditional technical scheme, the connecting piece and the screw rod are both made of metal materials and are connected in a welding mode, and in the welding process, the crystal shapes of the screw rod and the connecting piece are damaged and the situation of cracking easily occurs. In this scheme, screw rod 20 and injection molding 30 pass through hot melt and connect, and this process does not destroy the crystal state of screw rod 20, and then can guarantee screw rod 20's structural strength, guarantees electronic expansion valve's life. In addition, in the scheme, the connecting piece 40 is made of metal, the injection molding piece 30 is connected with the rotor body 10 through the connecting piece 40, and the stability of connection of the injection molding piece 30 and the rotor body 10 can be guaranteed.

As shown in fig. 2 and 3, the injection-molded part 30 is provided with a first through hole 301, and one end of the screw 20 is inserted into the first through hole 301. First through hole 301 sets up with rotor body 10 is coaxial, and the tip of screw rod 20 is worn to establish in injection molding 30 through first through hole 301, so sets up, can guarantee the area of contact between the outer peripheral face of injection molding 30 and screw rod 20, guarantees the stability that hot melt back, injection molding 30 and screw rod 20 are connected. In addition, the arrangement of the first through hole 301 can limit the position of the screw 20 relative to the injection molding part 30, and the smoothness of the hot melting process is ensured.

Further, the first through hole 301 penetrates the injection molded member 30 in the axial direction. So set up, can guarantee to have sufficient deformation allowance after injection molding 30 heats, guarantee injection molding 30 to screw rod 20's parcel effect, guarantee the stability of being connected of injection molding 30 and screw rod 20.

Specifically, the injection molding 30 includes a first injection molding part 31 and a second injection molding part 32 which are connected in sequence along the axial direction, the diameter of the first injection molding part 31 is greater than that of the second injection molding part 32, the first through hole 301 extends from the first injection molding part 31 to the second injection molding part 32, and one end of the screw 20 extends from the first injection molding part 31 into the second injection molding part 32 through the first through hole 301 and is welded with the second injection molding part 32. In this embodiment, the height of the second injection molding part 32 is greater than the height of the first injection molding part 31, so that the second injection molding part 32 is easy to melt and deform, and the stability of the injection molding part 30 connected with the screw 20 is ensured. Moreover, the injection molding piece 30 can be light in weight, and the rotor body 10 can drive the injection molding piece 30 to rotate smoothly.

Further, a first limit structure is arranged between the injection molding part 30 and the screw rod 20, and the first limit structure can limit the positions of the injection molding part 30 and the screw rod 20 in the axial direction; and/or the first limit structure can limit the position of the injection molding piece 30 and the screw 20 in the circumferential direction. So set up, can further guarantee the stability of injection molding 30 and screw rod 20 connection.

As shown in fig. 4 and 5, a circumferential surface of one end of the screw 20, which is engaged with the injection molded part 30, may be provided with a receiving groove 201, where the receiving groove 201 is used to receive a material of the injection molded part 30 after being deformed by heat, and the receiving groove 201 forms a first limiting structure. In this embodiment, the holding tank 201 and the second injection molding part 32 are disposed opposite to each other at the end far away from the first injection molding part 31, and the specific form of the holding tank 201 is not limited by this scheme, wherein the holding tank 201 is disposed in a plurality of circumferential intervals along the screw 20, the holding tank 201 can be set in a form with a rectangular cross section, the holding tank 201 can also be set in a form with a circular cross section, and when the cross section of the holding tank 201 is in the form of a circle, the holding tank 201 can be disposed to penetrate through the screw 20 along the radial direction of the screw 20. So set up for the second portion 32 of moulding plastics is heated the deformation back, and the plastics of deformation imbed to in the holding tank 201 to carry on spacingly at axis direction and circumference to screw rod 20 and injection molding 30.

As shown in fig. 1, an internal thread may be provided in the first through hole 301, an external thread may be provided at the end of the screw 20, the end of the screw 20 and the injection molding member 30 are connected in a thread-fit manner through the internal thread and the external thread, and the internal thread and the external thread form a first limit structure. The matching of the internal thread and the external thread can limit the positions of the screw rod 20 and the injection molding part 30 in the axial direction and the circumferential direction before hot melting treatment, so that the position accuracy of the screw rod 20 and the injection molding part 30 in the hot melting process is ensured, and the accuracy of the electronic expansion valve is ensured. Moreover, due to the arrangement, after hot melting, the injection molding part 30 is embedded into the threaded structure, and the connection stability of the injection molding part 30 and the screw 20 is ensured.

In this embodiment, the internal thread setting is moulded plastics the tip of the one end of keeping away from first portion 31 of moulding plastics of portion 32 at the second, so sets up, need not all set up the helicitic texture at the pore wall of whole first through-going hole 301, can guarantee the convenience of processing injection molding 30 and screw rod 20. In addition, the above arrangement can avoid the first injection molding part 31 from being deformed, and can ensure the coaxiality of the screw 20 and the injection molding 30.

Moreover, the end of the second injection molding part 32, which is far away from the first injection molding part 31, is of a round-angle structure, when the screw 20 and the second injection molding part 32 are welded, acting force towards the axis direction of the second injection molding part 32 is applied to the peripheral surface of the end, which is far away from the first injection molding part 31, of the second injection molding part 32, the end, which is far away from the first injection molding part 31, of the second injection molding part 32 is set to be of a round-angle structure, so that the plastic of the second injection molding part 32 can be extruded and infiltrated towards the thread structure of the screw 20, and the connection stability of the second injection molding part 32 and the screw 20 is ensured.

In this scheme, injection molding 30 and connecting piece 40 components of a whole that can function independently set up, and wherein, injection molding 30 accessible joint, grafting or fastener are connected with connecting piece 40. In this embodiment, the injection-molded part 30 is welded to the connecting part 40. So set up, can be convenient for retrieve rotor body 10, specifically, when retrieving, accessible turning or the mode that the heating melts separates screw rod 20 and injection molding 30 and retrieves screw rod 20, and the mode that the heating melts separates injection molding 30 and connecting piece 40 and retrieves rotor body 10. In addition, in the scheme, the injection molding part 30 is connected with the connecting part 40 and the screw 20 in a hot melting mode, so that the influence on the magnetic performance of the electronic expansion valve can be reduced, and the operation effect of the electronic expansion valve is ensured.

As shown in fig. 2, 3, 6 and 7, the connecting piece 40 is provided with a fitting hole 401, one side of the injection molded piece 30 close to the connecting piece 40 is provided with a convex portion 302, one end of the convex portion 302 far away from the injection molded piece 30 passes through the fitting hole 401 and is arranged to protrude out of the connecting piece 40, and the convex portion 302 is welded with the connecting piece 40. This scheme is to bellying 302's quantity, the restriction is not done to the shape, in this embodiment, connecting piece 40 is circular sheet structure, first portion 31 and the second of moulding plastics 32 all with the coaxial setting of connecting piece 40, mating holes 401 and first wear to establish hole 301 eccentric settings, and mating holes 401 is provided with two along connecting piece 40's circumference direction interval, bellying 302 is provided with two, and wear to establish respectively in two mating holes 401, the terminal surface setting of the one end of keeping away from injection molding 30 of the one end protrusion connecting piece 40 of injection molding 30 of bellying 302, after the hot melt is handled, the one end of keeping away from injection molding 30 of bellying 302 warp and is fixed with the terminal surface bonding of the one end of keeping away from injection molding 30 of connecting piece 40. So set up, can guarantee the stability that connecting piece 40 and injection molding 30 are connected to can place injection molding 30 and the relative pivoted condition takes place for connecting piece 40, guarantee the position accuracy between connecting piece 40 and the injection molding 30. Moreover, the arrangement can ensure the distance between the two protruding portions 302, ensure that the two protruding portions 302 are not affected after being subjected to thermal deformation, and ensure the smoothness of the connection between the two protruding portions 302 and the connecting piece 40. In this embodiment, the protruding portion 302 and the injection molding 30 are integrally formed, so that the stability of the connection between the protruding portion 302 and the injection molding 30 can be ensured.

Further, injection molding 30 and connecting piece 40 set up along the axis direction of screw rod 20 in order, and injection molding 30 is located the one side of keeping away from screw rod 20 of connecting piece 40, is provided with second through-hole 402 on the connecting piece 40, and the one end of screw rod 20 passes second through-hole 402 and with injection molding 30 butt fusion. In this embodiment, the end face of the end of the first injection molding part 31 far away from the second injection molding part 32 and the end face of the connecting piece 40 are mutually attached, and the second through hole 402 is coaxial with the first through hole 301 and has the same diameter, so that the coaxiality of the injection molding piece 30 and the connecting piece 40 can be ensured. So set up for the terminal surface of injection molding 30 and connecting piece 40 is laminated each other, has increased the area of contact of injection molding 30 with connecting piece 40, avoids injection molding 30 to take place the condition of upset in the axis direction, guarantees the stability that connecting piece 40 and injection molding 30 are connected. In addition, in the present embodiment, the connecting member 40 is formed by press molding, and the first lightening hole 403 with a sector-shaped cross section is disposed on the connecting member 40, so that convenience in processing the connecting member 40 can be ensured, and light weight of the connecting member 40 can be ensured

Further, an axial second limit structure is arranged between the connecting piece 40 and the screw rod 20 to limit the position of the screw rod 20 and the connecting piece 40 in the axial direction. The position accuracy of the screw rod 20 and the connecting piece 40 can be guaranteed due to the arrangement of the second limiting structure, the screw rod 20 is in rigid contact with the connecting piece 40, and the second limiting structure is arranged between the screw rod 20 and the connecting piece 40, so that the limiting accuracy can be guaranteed. The second limiting structure is not limited in the specific form of the present embodiment, in this embodiment, the screw 20 includes a first section and a second section which are arranged in a stepped manner along the axis direction, wherein the length of the second section is smaller than that of the first section, and a step surface formed between the second section and the first section is in limiting fit with the connecting member 40 to form the second limiting structure. So set up, its simple structure, and spacing effect is excellent. In addition, the first through hole 301 penetrates through the injection molding 30 along the axial direction, so that the screw 20 is not limited by the arrangement.

As shown in fig. 1, 8 and 9, the electronic expansion valve further includes a nut seat 50, a spiral track 60, a stopper ring 70 and a guide portion 80. The threaded rod 20 is threadedly engaged with the nut holder 50. The screw track 60 is annularly provided on the outer periphery of the nut holder 50. The stop ring 70 is movably disposed within the helical track 60. The guide portion 80 is integrally connected with the injection molding member 30, the extending direction of the guide portion 80 is the same as the extending direction of the screw rod 20 and is located outside the screw rod 20, and the guide portion 80 is in driving connection with the stop ring 70 so that the stop ring 70 slides in the spiral track 60. In this embodiment, the axial direction of the nut seat 50 is the same as the axial direction of the screw 20, the first end of the nut seat 50 penetrates through the rotor body 10, the second end of the nut seat 50 is located outside the rotor body 10, the end of the screw 20, which is far away from the injection molding 30, penetrates through the first end to the second end, the outer periphery of the first end of the nut seat 50 is sleeved with a spring, and a spiral track 60 is formed between each adjacent circle of the spring. One end of the guiding portion 80 is integrally connected with an end surface of the first injection molding portion 31, which is far away from one end of the second injection molding portion 32, and is disposed close to the edge of the first injection molding portion 31. The edge of connecting piece 40 is provided with the intercommunicating pore 404, this scheme does not do the restriction to the cross-section of leading portion 80, in this embodiment, the cross-section of leading portion 80 and the cross-section of intercommunicating pore 404 are the quadrangle, a side of leading portion 80 and the first global parallel and level setting of portion 31 of moulding plastics, so set up, can guarantee this intercommunicating pore 404 to the limiting displacement of leading portion 80, avoid leading portion 80 to take place the pivoted condition, further guarantee the stability of the connection of connecting piece 40 and injection molding 30, guarantee the fashioned convenience of leading portion 80 and injection molding 30, guarantee the convenience of intercommunicating pore 404 processing. In addition, in the present embodiment, three first lightening holes 403 are arranged at intervals along the circumferential direction of the connecting piece 40, and the communication hole 404 and the two mating holes 401 are respectively arranged between two adjacent first lightening holes 403, so that the structural strength of the connecting piece 40 can be ensured, and the convenience in processing the connecting piece 40 can be ensured. Three fan-shaped second lightening holes 311 are formed in the second injection molding part 32 at intervals along the circumferential direction, the three second lightening holes 311 and the three first lightening holes 403 are arranged in a one-to-one correspondence mode, and the arrangement of the second lightening holes 311 can guarantee the light weight of the injection molding part 30 and guarantee the smoothness of demolding of the injection molding part 30. In the traditional technical scheme, under the condition that does not set up injection molding 30, guide portion 80 and connecting piece 40 welding set up, so set up for guide portion 80 is little with the area of contact of connecting piece 40, takes place easily that guide portion 80 takes place crooked condition. The design of this scheme can avoid leading portion 80 to take place crooked condition, guarantees the depth of parallelism of leading portion 80 and screw rod 20.

When the electronic expansion valve of the scheme is assembled, the method can comprise the following steps: the connecting piece 40 and the rotor body 10 are integrally molded in an injection molding mode, the injection molding piece 30 provided with the guide portion 80 is connected with the connecting piece 40 in a hot melting mode, and the screw rod 20 is connected with the injection molding piece 30 in a hot melting mode after pulse setting.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

a rotor body (10);

the screw rod (20) is coaxially arranged with the rotor body (10), and the screw rod (20) is arranged on the rotor body (10) in a penetrating mode;

injection molding (30) and connecting piece (40), injection molding (30) with connecting piece (40) fixed connection, the periphery of connecting piece (40) with rotor body (10) are connected, screw rod (20) with injection molding (30) butt fusion.

2. An electronic expansion valve according to claim 1, wherein the injection-molded part (30) is provided with a first through-going hole (301), and one end of the screw (20) is arranged through the first through-going hole (301).

3. An electronic expansion valve according to claim 2, wherein the first through going hole (301) extends through the injection molded part (30) in axial direction.

4. An electronic expansion valve according to claim 2, wherein the injection-molded part (30) comprises a first injection-molded part (31) and a second injection-molded part (32) connected in series along an axial direction, the diameter of the first injection-molded part (31) is larger than the diameter of the second injection-molded part (32), the first through hole (301) extends from the first injection-molded part (31) to the second injection-molded part (32), and one end of the screw (20) extends from the first injection-molded part (31) into the second injection-molded part (32) through the first through hole (301) and is welded to the second injection-molded part (32).

5. The electronic expansion valve according to claim 2, wherein a first limit structure is arranged between the injection-molded part (30) and the screw (20), and the first limit structure is used for limiting the position of the injection-molded part (30) and the screw (20) in the axial direction; and/or the first limiting structure can limit the position of the injection molding piece (30) and the screw (20) in the circumferential direction.

6. An electronic expansion valve according to claim 5, wherein an internal thread is provided in the first through hole (301), an external thread is provided at an end of the screw (20), the end of the screw (20) and the injection molded part (30) are in thread fit connection through the internal thread and the external thread, and the internal thread and the external thread form the first limit structure.

7. The electronic expansion valve according to claim 5, wherein a circumferential surface of the end of the screw (20) engaged with the injection-molded part (30) is provided with a receiving groove (201), the receiving groove (201) is used for receiving a material of the injection-molded part (30) after being deformed by heat, and the receiving groove (201) forms the first limiting structure.

8. An electronic expansion valve according to claim 1, wherein the injection-molded part (30) is welded to the connecting part (40).

9. An electronic expansion valve according to claim 8, wherein the connecting piece (40) is provided with a fitting hole (401), a side of the injection-molded piece (30) close to the connecting piece (40) is provided with a protrusion (302), an end of the protrusion (302) remote from the injection-molded piece (30) is arranged to pass through the fitting hole (401) and protrude from the connecting piece (40), and the protrusion (302) is welded to the connecting piece (40).

10. An electronic expansion valve according to claim 9, wherein the injection-molded part (30) and the connecting part (40) are arranged in sequence along the axial direction of the screw (20), the injection-molded part (30) is located on the side of the connecting part (40) away from the screw (20), a second through hole (402) is provided in the connecting part (40), and one end of the screw (20) passes through the second through hole (402) and is welded with the injection-molded part (30).

11. An electronic expansion valve according to claim 10, wherein an axial second stop structure is arranged between the connection member (40) and the screw (20) to limit the position of the screw (20) and the connection member (40) in the axial direction.

12. The electronic expansion valve of claim 1, further comprising:

the nut seat (50) is matched with the screw rod (20) in a threaded mode;

a spiral track (60) annularly arranged on the periphery of the nut seat (50);

a stop ring (70) movably disposed within the helical track (60);

guide portion (80), with injection molding (30) integrated into one piece connects, guide portion (80) the extending direction with the extending direction of screw rod (20) is the same and is located the outside of screw rod (20), guide portion (80) with backstop circle (70) drive connection, so that backstop circle (70) is in spiral track (60) slide.