CN116336195A - Electronic expansion valve - Google Patents

Abstract

The invention discloses an electronic expansion valve, which comprises a valve seat, a magnetic rotor, a nut component and a valve needle component, wherein the valve seat is arranged on the magnetic rotor; the valve needle component is provided with an external thread part matched with the thread part in a threaded mode, the magnetic rotor can drive the nut component to rotate, and the valve needle component can move along the axial direction of the valve seat to be close to or far away from a valve port of the valve seat. The electronic expansion valve has simple structural design and relatively fewer parts, and is beneficial to reducing the manufacturing cost.

Description

Electronic expansion valve

Technical Field

The invention relates to the technical field of valves, in particular to an electronic expansion valve.

Background

The electronic expansion valve is used in refrigerating system to regulate the flow of refrigerant.

At present, an electronic expansion valve is commonly used, wherein the working principle is that a coil receives a driving pulse signal to generate a periodically-changing magnetic field, a rotor is controlled to rotate, a screw rod fixedly connected with the rotor is driven to rotate together, the screw rod can move in the axial direction of a valve element while rotating through the threaded cooperation of the screw rod and a nut component, and accordingly a valve needle is driven to move upwards or downwards to be far away from or close to a valve port, the opening of the valve port is regulated, and the flow of a refrigerant is controlled.

The electronic expansion valve has more parts and higher manufacturing cost.

Disclosure of Invention

The invention aims to provide an electronic expansion valve which has simple structural design and relatively fewer parts and is beneficial to reducing the manufacturing cost.

In order to solve the technical problems, the invention provides an electronic expansion valve, which comprises a valve seat, a magnetic rotor, a nut component and a valve needle component; the valve needle component is provided with an external thread part matched with the thread part in a threaded mode, the magnetic rotor can drive the nut component to rotate, and the valve needle component can move along the axial direction of the valve seat to be close to or far away from a valve port of the valve seat.

The nut component and the valve seat are relatively fixed in the axial direction of the valve seat, the magnetic rotor is fixed on the periphery of the nut component, the valve needle component is inserted into an internal threaded hole of the nut component, and the valve needle component is provided with an external threaded part matched with the threaded component.

The electronic expansion valve as described above, the nut member includes a main body portion and a lower shaft portion extending downward from a bottom end of the main body portion, the radial dimension of the lower shaft portion being smaller than the radial dimension of the main body portion; the valve seat is internally fixed with a lower shaft sleeve, the lower shaft part is axially limited in the lower shaft sleeve, and the bottom end surface of the main body part abuts against the top end surface of the lower shaft sleeve.

As described above, the shaft hole of the lower shaft sleeve includes a first aperture section and a second aperture section, the radial dimension of the first aperture section is greater than the radial dimension of the second aperture section, the lower shaft portion is limited on the first aperture section, the valve needle component includes a guiding portion, the guiding portion is assembled with the second aperture section in an inserting manner, and a limiting structure is disposed between the guiding portion and the second aperture section to limit the valve needle component to rotate in a circumferential direction.

The electronic expansion valve is characterized in that the second aperture section is a circular hole, at least one plane part is arranged in the circumferential direction of the guide part, and the limiting structure comprises the plane part.

In the electronic expansion valve, the cross section of the guide part is of a polygonal structure.

The electronic expansion valve comprises the limiting structure and the flange limited in the groove, wherein the groove is formed in the guide part, and the flange is formed in the hole wall corresponding to the second aperture section; or the groove is arranged on the hole wall corresponding to the second hole diameter section, and the flange is arranged on the guide part.

The electronic expansion valve as described above, the nut member further includes an upper shaft portion extending upward from a tip end of the main body portion, a radial dimension of the upper shaft portion being smaller than a radial dimension of the main body portion; the electronic expansion valve comprises an upper shaft sleeve which is fixed relative to the valve seat, the upper shaft part is axially limited in the upper shaft sleeve, and the bottom end face of the upper shaft sleeve is propped against the top end face of the main body part.

The electronic expansion valve further comprises an envelope, wherein the envelope is fixedly connected with the valve seat, a sleeve cavity is formed in the envelope, and the nut component and the magnetic rotor are arranged in the sleeve cavity; the upper shaft sleeve is fastened in the sleeve, and the sleeve further comprises a limiting part, wherein the limiting part is used for limiting the upper shaft sleeve to be axially upwards positioned relative to the sleeve.

The electronic expansion valve comprises the sleeve and the sealing cover, wherein the sealing cover seals the opening at the upper end of the sleeve, the sealing cover comprises a cover peripheral wall and an annular cover plate, the annular cover plate extends outwards from the bottom end of the cover peripheral wall along the radial direction, the limiting part comprises the annular cover plate, and the annular cover plate is in butt joint with the top end surface of the upper shaft sleeve.

As described above, the envelope is of an integrally formed structure, or the sleeve of the envelope and the cover are separately disposed, and the cover and the sleeve are fixed by welding.

The electronic expansion valve comprises the electronic expansion valve, wherein the shaft hole of the upper shaft sleeve comprises a third aperture section and a fourth aperture section, the radial size of the third aperture section is larger than that of the fourth aperture section, the upper shaft is limited on the third aperture section, and a first downward limiting surface part is formed at the joint of the third aperture section and the fourth aperture section; the valve needle component comprises a shaft rod portion, the shaft rod portion is in insertion fit with the fourth hole diameter section, the radial size of the shaft rod portion is smaller than that of the external thread portion, an upward second limiting face portion is formed between the shaft rod portion and the external thread portion, the second limiting face portion can abut against the first limiting face portion, and a first elastic ring is arranged between the first limiting face portion and the second limiting face portion.

As described above, the valve port portion of the valve seat is provided with a second elastic ring; or alternatively, the process may be performed,

the valve needle part comprises a guide part, a valve needle part and a limiting collar, wherein the limiting collar is fixed on the periphery of the guide part, the guide part is provided with a cavity, an elastic piece is arranged in the cavity and is in butt joint with the valve needle part, the valve needle part can move along the axial direction of the valve seat relative to the guide part, and the limiting collar is used for limiting the downward moving position of the valve needle part.

In the electronic expansion valve, the hole wall corresponding to the internal threaded hole is provided with more than one groove part extending along the axial direction.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of an electronic expansion valve according to the present invention;

FIG. 2 is a schematic cross-sectional view of an internally threaded bore of the nut component of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the mating structure of the guide portion and lower sleeve of the valve pin assembly of FIG. 1;

FIG. 4 is a schematic cross-sectional view of another mating structure of the guide portion of the needle member with the lower sleeve;

FIG. 5 is a schematic cross-sectional view of another embodiment of an electronic expansion valve according to the present invention;

FIG. 6 is a schematic cross-sectional view of another embodiment of an electronic expansion valve according to the present invention;

fig. 7 is a schematic view of the mating of the guide portion and the needle portion of the needle component of fig. 6.

Reference numerals illustrate:

valve seat 10, valve port 11a, valve chamber 12, first port 13, second port 14;

a nut member 20, a main body 21, an upper shaft 22, a lower shaft 23, an internally threaded hole 201, and a groove 202;

the valve needle part 30, the shaft rod part 31, the external thread part 32, the guide part 33, the flange 331, the cavity 332, the valve needle part 34, the first stop surface part 341, the second stop surface part 35, the stop collar 36, the second stop surface part 361 and the elastic piece 37;

a magnetic rotor 40;

an upper shaft sleeve 50, an upper shaft hole 51, a third aperture section 511, a fourth aperture section 512, a first limiting surface 513;

a lower shaft sleeve 60, a lower shaft hole 61, a first aperture section 611, a second aperture section 612 and a groove 6121;

jacket 70, 70 ', sleeve 71, 71', cover 72, 72 ', cover top wall 721, 721', cover peripheral wall 722, 722 ', annular cover plate 723, 723';

a first elastic ring 81 and a second elastic ring 82.

Detailed Description

In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

Referring to fig. 1, fig. 1 is a schematic cross-sectional view of an electronic expansion valve according to an embodiment of the invention.

In this embodiment, the electronic expansion valve includes a valve seat 10, a nut member 20, a needle member 30, and a magnetic rotor 40.

The valve seat 10 is provided with a valve port part 11 and a valve cavity 12, the valve port part 11 is provided with a valve port 11a, the valve port 11a is communicated with the valve cavity 12, the valve seat 10 is also provided with a first interface 13 and a second interface 14, the first interface 13 can be communicated with the valve cavity 12 through the valve port 11a, and the second interface 14 is directly communicated with the valve cavity 12; when the valve seat 10 is specifically arranged, the valve seat 10 can be of an integrated structure, the valve port part 11 is directly formed on the valve seat 10, and the valve seat 10 can also be of a split structure and comprises a main body part and a valve port part; in practical application, the first interface 13 may be used to connect with the first connection pipe, the second interface 14 may be used to connect with the second connection pipe, and by adjusting the opening of the valve port, the flow rate of the refrigerant between the first interface 13 and the second interface 14 may be controlled.

For ease of understanding and description, references herein to "axial" are intended to refer to the axial direction of the valve seat 10.

The nut member 20 is fixed relative to the valve seat 10 in the axial direction, that is, along the axial direction of the valve seat 10, that is, in the vertical direction shown in fig. 1, the relative positions of the nut member 20 and the valve seat 10 are fixed.

The needle member 30 is inserted into the internally threaded hole 201 of the nut member 20, and the needle member 30 includes an externally threaded portion 32 having an external thread, and the externally threaded portion 32 is threadedly engaged with the internally threaded hole 201 (shown in fig. 2) of the nut member 20.

The electronic expansion valve further comprises a coil (not shown in the figure), a periodically-changing magnetic field is generated after the coil receives a driving pulse signal, the magnetic rotor 40 is excited to rotate, the magnetic rotor 40 is fixed on the periphery of the nut component 20, the nut component 20 can rotate along with the magnetic rotor 40, and the valve needle component 30 in threaded connection with the nut component 20 can move up and down along the axial direction of the valve seat 10 under the rotating action of the nut component 20 due to the fact that the position of the nut component 20 in the axial direction is fixed, so that the valve needle part 34 of the valve needle component 30 is close to or far from the valve port 11a of the valve seat 10, the flow area of the valve port 11a is changed, and the regulation and switching functions of refrigerant flow are achieved.

Specifically, the magnetic rotor 40 may be fixedly sleeved on the outer periphery of the main body 21 of the nut member 20, and the magnetic rotor 40 and the nut member 20 may be integrally fixed by injection molding.

The nut component 20 of the electronic expansion valve is directly matched with the valve needle component 30, the integral structure is simplified, the number of parts is relatively reduced, and the manufacturing cost of products is reduced.

The nut member 20 and the needle member 30 are defined herein as being lower at the end near the valve port 11a and upper at the end far from the valve port 11a in the axial direction of the valve seat 10.

As shown in fig. 1, in this embodiment, the nut member 20 includes a main body portion 21 and a lower shaft portion 23 extending downward from the bottom end of the main body portion 21, the radial dimension of the lower shaft portion 23 is smaller than the radial dimension of the main body portion 21, a lower boss 60 is fixed in the valve seat 10, the lower shaft portion 23 of the nut member 20 is axially restrained in the lower boss, and the bottom end surface of the main body portion 21 abuts against the top end surface of the lower boss 60, so that the position where the nut member 20 moves downward with respect to the valve seat 10 can be defined.

The arrangement of the lower sleeve 60 can relieve friction between the nut member 20 and the valve seat 10, reduce wear on the valve seat 10 or the nut member 20, and prolong the service lives of the valve seat 10 and the nut member 20.

The nut member 20 further includes an upper shaft portion 22 extending upward from the top end of the main body portion 21, the upper shaft portion 22 having a radial dimension smaller than that of the main body portion 21, the electronic expansion valve further includes an upper boss 50 relatively fixed to the valve seat 10, the upper shaft portion 22 of the nut member 20 is axially restrained within the upper boss 50, and a bottom end surface of the upper boss 50 abuts against the top end surface of the main body portion 21, so that a position where the nut member 20 moves upward with respect to the valve seat 10 is achieved.

The arrangement of the upper and lower bushings 50, 60 defines the axial position of the nut member 20 relative to the valve seat 10 such that the nut member 20 cannot move axially and can only rotate circumferentially with the magnetic rotor 40 to ensure that the needle member 30, which is threadedly engaged with the nut member 20, can move up and down.

It will be appreciated that the radial dimensions of the upper and lower shaft portions 22, 23 of the nut member 20 are smaller than the main body portion 21, so that the positions of the nut member 20 inserted into the upper and lower bushings 50, 60 can be restricted, and the restriction is preferably achieved, and the assembly is also facilitated.

In practical applications, the upper shaft sleeve 50 and the lower shaft sleeve 60 can be made of brass by turning or powder pressing, and of course, can also be made of fluorine-resistant, wear-resistant and temperature-resistant hard plastic by injection.

In this embodiment, the upper sleeve 50 is fixed relative to the valve seat 10 by the sleeve 70, the lower end of the sleeve 70 is fixedly connected to the valve seat 10, and the sleeve 70 may be fixed to the valve seat 10 by argon arc welding or laser welding, and sealing is achieved. The envelope 70 has a housing cavity for accommodating the nut member 20, the magnetic rotor 40, and the like.

The upper bushing 50 is secured within the interior of the envelope 70, and in particular, the outer diameter of the upper bushing 50 may be a close fit with the envelope 70.

As shown in fig. 1, in this embodiment, the sleeve 70 is an integrally formed structure including a sleeve 71 and a cover 72, wherein the lower end of the sleeve 71 is fixedly connected with the valve seat 10, the cover 72 seals the upper end opening of the sleeve 71, the cover 72 has a generally cap shape and includes a top wall 721, a peripheral wall 722 and an annular cover plate 723, the annular cover plate 723 extends radially outwardly from the bottom end of the peripheral wall 722, and the annular cover plate 723 is abuttable against the top end surface of the upper sleeve 50 to define an axially upward position of the upper sleeve 50 relative to the sleeve 70. It will be appreciated that the top end surface of the body portion 21 of the nut member 20 described above limits the axially downward position of the upper boss 50, and that the body portion 21 in combination with the annular cover plate 723 define the axial position of the upper boss 50.

In practice, the cover 72 of the sleeve 70 may be in the form of a plate, provided that it seals the upper end opening of the sleeve 71, and a retainer ring is provided at a suitable position within the sleeve 71 to define the axial position of the upper sleeve 50.

To facilitate axial positioning of the sleeve 71 and the valve seat 10, the valve seat 10 may be formed with an upwardly facing stop step surface against which the sleeve 71 abuts.

Referring to fig. 2 together, fig. 2 is a schematic cross-sectional view of the internal threaded bore of the nut member of fig. 1.

In actual setting, the nut component 20 can be formed by adopting fluorine-resistant and temperature-resistant hard plastic for injection molding, more than one groove part 202 extending along the axial direction can be arranged on the hole wall corresponding to the internal threaded hole 201 of the nut component 20, and the arrangement of the groove part 202 can meet the injection molding and demolding requirements on one hand and is beneficial to lubricating the valve needle component 30 by lubricating oil on the other hand.

The structure of the nut member 20 having three groove portions 202 is exemplarily shown in fig. 2, and in actual arrangement, the number and arrangement of the groove portions 202 may be set as needed, not limited to those shown in the drawings.

As shown in fig. 1, in this embodiment, the needle member 30 includes a shaft portion 31, an external thread portion 32, a guide portion 33, and a needle portion 34, which are sequentially connected from top to bottom, and the needle member 30 is inserted into the nut member 20 with the shaft portion 31 passing through the upper shaft sleeve 50 and the needle portion 34 passing through the lower shaft sleeve 60.

The lower shaft hole 61 of the lower shaft sleeve 60 includes a first aperture section 611 and a second aperture section 612, the radial dimension of the first aperture section 611 is larger than the radial dimension of the second aperture section 612, the aperture of the first aperture section 611 is matched with the outer diameter of the lower shaft portion 23 of the nut member 20, the lower shaft portion 23 is limited in the first aperture section 611, the guiding portion 33 is in insertion fit with the second aperture section 612, a limiting structure is arranged between the guiding portion 33 and the second aperture section 612 to limit the valve needle member 30 to rotate in the circumferential direction, and in this way, the valve needle member 30 can be prevented from rotating along with the nut member 20, the valve needle member 30 is ensured to move up and down only along the axial direction, and abrasion between the valve needle member 30 and related matched members, particularly abrasion between the valve needle member 30 and the valve port portion 11 when the valve is closed, can be reduced.

The limiting structure between the guide portion 33 and the second aperture section 612 of the lower shaft sleeve 60 may have various forms, in which, in a specific manner, the second aperture section 612 of the lower shaft sleeve 60 is a circular hole, and the guide portion 33 of the needle member 30 has at least one planar portion in the circumferential direction, so that the needle member 30 cannot rotate in the circumferential direction due to the limitation of the planar portion; specifically, the cross section of the guiding portion 33 may be polygonal, so that the processing is convenient, for example, the cross section may be a quadrilateral structure as shown in fig. 3, and of course, the cross section may be other polygonal structures such as a triangle or a pentagon.

Alternatively, the second bore section 612 of the lower shaft sleeve 60 is a circular hole, the guiding portion 33 of the valve needle member 30 is cylindrical, but an outwardly protruding flange 331 is provided on the peripheral wall of the guiding portion 33, a groove 6121 matching with the flange 331 is provided on the hole wall corresponding to the second bore section 612, and when assembled, the flange 331 of the guiding portion 33 is limited in the groove 6121, thus limiting the circumferential rotation of the valve needle member 30, as shown in fig. 4; of course, in actual arrangement, the groove may be formed on the peripheral wall of the guide portion 33, and the flange is formed on the hole wall corresponding to the second hole section 612.

Wherein the upper shaft hole 51 of the upper shaft sleeve 50 includes a third aperture section 511 and a fourth aperture section 512, the radial dimension of the third aperture section 511 is larger than the radial dimension of the fourth aperture section 512, the third aperture section 511 is located below the fourth aperture section 512, so that a first limiting surface 513 facing downward is formed at the connection of the third aperture section 511 and the fourth aperture section 512; the aperture of the third aperture section 511 is adapted to the outer diameter of the upper shaft portion 22 of the nut member 20, the upper shaft portion 22 being limited to the third aperture section 511, the aperture of the fourth aperture section 512 being adapted to the outer diameter of the shaft portion 31 of the needle member 30, i.e. the shaft portion 31 is insertable into engagement with the fourth aperture section 512.

The radial dimension of the shaft portion 31 of the needle member 30 is smaller than the radial dimension of the male screw portion 32, so that a second limit surface portion 35 is formed between the shaft portion 31 and the male screw portion 32, and when the needle member 30 moves upward, the second limit surface portion 35 can abut against the first limit surface portion 513 of the upper sleeve 50 to limit the limit position of the upward movement of the needle member 30. The limiting structure can avoid additional parts by utilizing the structural arrangement of the valve needle part 30 and the structural arrangement of the upper shaft sleeve 50.

Specifically, a first elastic ring 81 may be disposed between the first limiting surface 513 and the second limiting surface 35, so as to relieve an impact force between the second limiting surface 35 and the first limiting surface 513 when the valve needle member 30 moves upward, and reduce wear and noise therebetween.

The first elastic ring 81 may be specifically fitted around the shaft portion 31 of the needle member 30 and supported by the second stopper surface portion 35, and of course, an installation groove may be provided in the first stopper surface portion 513 of the upper sleeve 50, and the first elastic ring 81 may be fitted into the installation groove.

In this embodiment, the second elastic ring 82 is provided on the valve port portion 11 of the valve seat 10, so that the impact of the needle portion 34 of the needle member 30 on the valve port portion 11 can be alleviated, the wear between the needle portion 34 and the valve port portion 11 can be reduced, and the noise can be reduced. Specifically, an installation groove may be provided in the valve port 11, and the second elastic ring 82 may be fitted into the installation groove.

The first elastic ring 81 can be an elastic rubber ring, the valve port part 11 has a sealing requirement, the second elastic ring 82 can be made of an elastic sealing material, and meanwhile, the material can resist fluorine and oil, and can be specifically selected according to application requirements.

Referring to fig. 5, fig. 5 is a schematic cross-sectional view of another embodiment of an electronic expansion valve according to the present invention.

The electronic expansion valve of the embodiment of fig. 5 is identical in basic structural composition and operation to that of fig. 1, and differs only in the structure of the envelope, and only this difference is described below, all of which can be understood with reference to the foregoing description.

As shown in fig. 5, the envelope 70 ' is of a split construction and includes a relatively independent sleeve 71 ' and a cover 72 ', the sleeve 71 ' still being fixedly connected to the valve seat 10, the cover 72 ' for sealing the upper end opening of the sleeve 71 ', the cover 72 ' including a cover top wall 721 ' and a cover peripheral wall 722 ', the bottom end of the cover peripheral wall 722 ' extending radially outwardly to form an annular cover plate 723 '.

During assembly, other parts of the electronic expansion valve and the sleeve 71 ' can be assembled, after the nut component 20 can smoothly rotate, the sealing cover 72 ' and the sleeve 71 ' are fixed in a welding mode and the like, and after assembly, the annular cover plate 723 ' of the sealing cover 72 ' still presses against the upper shaft sleeve 50 to limit the upper shaft sleeve.

Referring to fig. 6 and 7, fig. 6 is a schematic cross-sectional view illustrating an electronic expansion valve according to another embodiment of the present invention; fig. 7 is a schematic view of the mating of the guide portion and the needle portion of the needle component of fig. 6.

The electronic expansion valve of the embodiment of fig. 6 is identical in basic structural composition and operation to that of fig. 5, and differs in the structure of the needle member 30, only this difference will be described below, and others will be understood with reference to the foregoing description.

As shown in fig. 7, in this embodiment, the valve needle portion 34 and the guide portion 33 of the valve needle member 30 are in a split structure, and the valve needle member 30 further includes a stopper collar 36, where the stopper collar 36 is fixed on the outer periphery of the guide portion 33, specifically, may be fixed by screwing; the guide portion 33 has a cavity 332, an elastic member 37 is disposed in the cavity 332, the elastic member 37 abuts against the valve needle portion 34, the valve needle portion 34 can move along the axial direction of the valve seat 10 relative to the guide portion 33, and the stop collar 36 is used for limiting the downward movement position of the valve needle portion 36.

After the above arrangement, when the valve needle portion 34 of the needle member 30 contacts the valve opening 11 during closing, and when the needle member 30 continues to move downward, the guide portion 33 moves downward relative to the valve needle portion 34 due to the restriction of the valve opening 11, and the valve needle portion 34 abuts against the valve opening 11 via the elastic member 37, so that the reverse pressure difference resistance during full closing can be improved, and the impact of the valve needle portion 34 on the valve opening 11 can be relieved.

Specifically, the valve needle portion 36 has a first stop surface portion 341 facing downward, the stop collar 36 has a second stop surface portion 361 facing upward, and the elastic member 37 presses against the valve needle portion 36, so that the first stop surface portion 341 of the valve needle portion 36 abuts against the second stop surface portion 361 of the stop collar 36, thereby limiting the downward movement position of the valve needle portion 36.

It will be appreciated that in the electronic expansion valve shown in fig. 1 described above, the needle member 30 may also employ the arrangement shown in fig. 7 to mitigate impact on the valve port 11.

The electronic expansion valve provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims (13)

1. An electronic expansion valve is characterized by comprising a valve seat, a magnetic rotor, a nut component and a valve needle component; the valve needle component is provided with an external thread part matched with the thread part in a threaded mode, the magnetic rotor can drive the nut component to rotate, and the valve needle component can move along the axial direction of the valve seat to be close to or far away from a valve port of the valve seat.

2. The electronic expansion valve according to claim 1, wherein the nut member includes a main body portion and a lower shaft portion extending downward from a bottom end of the main body portion, a radial dimension of the lower shaft portion being smaller than a radial dimension of the main body portion; the valve seat is internally fixed with a lower shaft sleeve, the lower shaft part is axially limited in the lower shaft sleeve, and the bottom end surface of the main body part abuts against the top end surface of the lower shaft sleeve.

3. The electronic expansion valve of claim 2, wherein the shaft bore of the lower bushing includes a first bore section and a second bore section, the radial dimension of the first bore section being greater than the radial dimension of the second bore section, the lower shaft section being defined in the first bore section, the valve pin member including a guide portion that is in insertion engagement with the second bore section, a spacing structure being provided between the guide portion and the second bore section to limit rotation of the valve pin member in a circumferential direction.

4. The electronic expansion valve of claim 3, wherein said second bore section is a circular bore, said guide portion having at least one planar portion in a circumferential direction, said spacing structure comprising said planar portion.

5. The electronic expansion valve of claim 4, wherein the guide has a polygonal cross-section.

6. The electronic expansion valve of claim 3, wherein the limiting structure comprises a groove and a flange limited in the groove, the groove is arranged on the guide part, and the flange is arranged on a hole wall corresponding to the second aperture section; or the groove is arranged on the hole wall corresponding to the second hole diameter section, and the flange is arranged on the guide part.

7. The electronic expansion valve according to claim 1, wherein the nut member includes a main body portion and an upper shaft portion extending upward from a tip end of the main body portion, a radial dimension of the upper shaft portion being smaller than a radial dimension of the main body portion; the electronic expansion valve comprises an upper shaft sleeve which is fixed relative to the valve seat, the upper shaft part is axially limited in the upper shaft sleeve, and the bottom end face of the upper shaft sleeve is propped against the top end face of the main body part.

8. The electronic expansion valve of claim 7, further comprising a sleeve fixedly connected to the valve seat, the sleeve having a sleeve cavity therein, the nut member and the magnetic rotor being disposed in the sleeve cavity; the upper shaft sleeve is fastened in the sleeve, and the sleeve further comprises a limiting part, wherein the limiting part is used for limiting the upper shaft sleeve to be axially upwards positioned relative to the sleeve.

9. The electronic expansion valve of claim 8, wherein the envelope comprises a sleeve and a cover that closes an upper end opening of the sleeve, the cover comprising a cover peripheral wall and an annular cover plate that extends radially outward from a bottom end of the cover peripheral wall, the retainer comprising the annular cover plate that abuts a top end face of the upper sleeve.

10. The electronic expansion valve of claim 9, wherein said envelope is of unitary construction or said sleeve of said envelope and said cover are separately provided, said cover and said sleeve being secured by welding.

11. The electronic expansion valve of claim 7, wherein the shaft bore of the upper bushing comprises a third bore section and a fourth bore section, the third bore section having a radial dimension greater than the fourth bore section, the upper shaft section being defined in the third bore section, the junction of the third bore section and the fourth bore section forming a first limiting face portion facing downward; the valve needle component comprises a shaft rod portion, the shaft rod portion is in insertion fit with the fourth hole diameter section, the radial size of the shaft rod portion is smaller than that of the external thread portion, an upward second limiting face portion is formed between the shaft rod portion and the external thread portion, the second limiting face portion can abut against the first limiting face portion, and a first elastic ring is arranged between the first limiting face portion and the second limiting face portion.

12. The electronic expansion valve of any of claims 1-11, wherein the valve port portion of the valve seat is provided with a second resilient ring; or alternatively, the process may be performed,

the valve needle part comprises a guide part, a valve needle part and a limiting collar, wherein the limiting collar is fixed on the periphery of the guide part, the guide part is provided with a cavity, an elastic piece is arranged in the cavity and is in butt joint with the valve needle part, the valve needle part can move along the axial direction of the valve seat relative to the guide part, and the limiting collar is used for limiting the downward moving position of the valve needle part.

13. The electronic expansion valve of any of claims 1-11, wherein the bore wall corresponding to the internally threaded bore is provided with one or more axially extending slots.

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