CN217463241U

CN217463241U - Electronic expansion valve

Info

Publication number: CN217463241U
Application number: CN202220245983.5U
Authority: CN
Inventors: 陈勇好; 黄鸿峰; 刘曈晖
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-09-20
Anticipated expiration: 2032-01-28
Also published as: WO2023143028A1

Abstract

The utility model discloses an electronic expansion valve, which comprises an outer cover, a valve seat and a nut seat, wherein the valve seat and the outer cover form a cavity; the valve seat is provided with a valve port and a concave part which is arranged corresponding to the valve port, and the valve seat also comprises a deformation part which can deform along the radial direction; the nut seat is arranged in the cavity and comprises a sleeve part and a connecting part integrally arranged on the outer peripheral surface of the sleeve part in a protruding mode, at least part of the connecting part is arranged in the concave part, and the connecting part is limited in the concave part by the deformation part along the axial direction.

Description

Electronic expansion valve

Technical Field

The utility model relates to a refrigerating system technical field particularly, relates to an electronic expansion valve.

Background

Along with the popularization of the variable frequency air conditioner, the electronic expansion valve is used as a main component of the variable frequency air conditioner, and the performance of the electronic expansion valve greatly influences the comfort and the energy saving of the air conditioner. However, the valve seat and the nut seat of the electronic expansion valve in the related art are both metal pieces and are connected by riveting; alternatively, the valve seat is riveted to the metal insert of the nut seat. Thus, there are problems of complicated processing and high cost.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides an electronic expansion valve to solve the complicated, with high costs problem of processing that exists among the correlation technique.

The utility model discloses electronic expansion valve, include:

a housing;

the valve seat and the outer cover form a chamber; the valve seat is provided with a valve port and a concave part which is arranged corresponding to the valve port, and the valve seat also comprises a deformation part which can deform along the radial direction;

and the nut seat is arranged in the cavity and comprises a sleeve part and a connecting part integrally arranged on the outer peripheral surface of the sleeve part in a protruding mode, and at least part of the connecting part is arranged in the concave part and is limited in the concave part by the deformation part along the axial direction.

According to some embodiments of the present invention, the electronic expansion valve further comprises:

the screw rod is arranged in the cavity and is in threaded connection with the sleeve part;

the valve needle is connected with the screw rod and is used for being matched with the valve port so as to adjust the opening degree of the valve port; and

and the magnetic rotor is arranged in the cavity, is in induction connection with a coil and is connected with the screw rod.

According to some embodiments of the invention, the deformation portion is provided at an opening edge of the concave portion.

According to some embodiments of the invention, the recess comprises a bottom and a side portion, the wall thickness of the side portion being greater than the wall thickness of the deformation portion.

According to some embodiments of the invention, the sleeve portion comprises:

the thread section is provided with an internal thread structure, and the internal thread structure is in threaded connection with the external thread structure of the screw rod;

the first guide section is arranged at one end of the threaded section, and the screw rod can movably penetrate through the first guide section along the axial direction;

and the second guide section is arranged at the other end of the thread section, and the valve needle can movably penetrate through the second guide section along the axial direction.

According to some embodiments of the invention, the screw further comprises a receiving groove;

the electronic expansion valve further comprises an elastic piece, the elastic piece is arranged in the accommodating groove, one end of the elastic piece is abutted with the groove bottom of the accommodating groove, and the other end of the elastic piece is abutted with the valve needle, so that the valve needle has a tendency of being far away from the screw rod; an end of the valve needle is defined in the receiving groove.

According to some embodiments of the invention, the connecting portion and the threaded section are axially staggered.

According to some embodiments of the present invention, the outer peripheral surface of the connecting portion and the recess portion further have a limit structure therebetween, the limit structure being used for limiting the nut seat and the valve seat to generate circumferential rotation.

According to some embodiments of the present invention, the limiting structure comprises a first plane, the first plane is disposed on the connecting portion, and is attached to the concave portion.

According to some embodiments of the invention, the nut seat further has a balancing channel that penetrates through an inner peripheral surface of the sleeve portion and an outer peripheral surface of the connecting portion; and/or the nut seat is made of plastic.

An embodiment of the above utility model has at least the following advantages or beneficial effects:

the utility model discloses electronic expansion valve, nut seat include that sleeve portion and integrative protruding establish the connecting portion at the outer peripheral face of sleeve portion, and at least partial connecting portion set up in the concave part of disk seat, and the disk seat is still including the deformation portion that can produce deformation. When the nut seat and the valve seat are installed, the nut seat and the valve seat can be fixed in the axial direction by connecting the connecting part with the deformation part. Compare in the connected mode of nut seat and disk seat of correlation technique, the embodiment of the utility model provides a nut seat adopts integrative structural design, has the advantage of convenient processing. In addition, the connecting part and the sleeve part are of an integrated structure, so that a metal insert is omitted, and the material cost is reduced. And, the coaxiality of the connecting portion and the sleeve portion is also improved.

Drawings

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

Fig. 2 shows a partial enlarged view at a in fig. 1.

Fig. 3 is a perspective view of a nut holder according to an embodiment of the present invention.

Fig. 4 shows a cross-sectional view of a nut seat according to an embodiment of the invention.

Wherein the reference numerals are as follows:

1. outer cover

11. Pipe section

12. Sealing cover

13. Chamber

2. Valve seat

21. Valve port

22. Concave part

221. Bottom part

222. Side part

23. Deformation part

25. Through hole

3. Nut seat

31. Sleeve part

311. Thread segment

312. First guide section

313. Second guide section

32. Connecting part

321. First plane

4. Screw mandrel

41. Accommodating tank

5. Valve needle

6. Magnetic rotor

7. Stop assembly

71. Winding column

72. Spring guide rail

73. Stop ring

74. Connecting piece

75. Second stop part

76. First stop part

81. Elastic piece

82. Balancing channel

91. First connecting pipe

92. Second connecting pipe

93. Position limiting piece

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

As shown in fig. 1 and 2, fig. 1 is a cross-sectional view of an electronic expansion valve according to an embodiment of the present invention. Fig. 2 shows a partial enlarged view at a in fig. 1.

The utility model discloses electronic expansion valve, including dustcoat 1, coil (not shown in the figure), disk seat 2, nut seat 3, lead screw 4, needle 5 and magnetic rotor 6.

It will be understood that the terms "comprises" and "comprising," and any variations thereof, in the embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or may alternatively include other steps or elements inherent to such process, method, article, or apparatus.

The coil is disposed on the outer periphery of the housing 1. The valve seat 2 is connected with the outer cover 1 and forms a chamber 13 together with the outer cover 1; the valve seat 2 has a valve port 21 and a concave portion 22 corresponding to the valve port 21, and the valve seat 2 further includes a deformation portion 23 deformable in the radial direction. The nut holder 3 is provided in the cavity 13, and includes a sleeve portion 31 and a connecting portion 32 integrally provided on an outer peripheral surface of the sleeve portion 31 in a protruding manner, and at least a part of the connecting portion 32 is provided in the recess 22 and is defined in the recess 22 by the deformation portion 23 in the axial direction. The screw 4 is disposed in the chamber 13 and is screwed with the sleeve portion 31. The valve needle 5 is connected with the screw rod 4 and is used for being matched with the valve port 21 so as to adjust the opening degree of the valve port 21. The magnetic rotor 6 is arranged in the chamber 13 and is inductively connected with the coil and connected with the lead screw 4.

The utility model discloses electronic expansion valve, nut seat 3 include that sleeve portion 31 and integrative protruding connecting portion 32 of establishing at the outer peripheral face of sleeve portion 31, at least partial connecting portion 32 set up in valve seat 2's concave part 22, and valve seat 2 still includes deformation portion 23 that can produce deformation. When the nut holder 3 is mounted on the valve seat 2, the nut holder 3 and the valve seat 2 can be fixed in the axial direction by connecting the connecting portion 32 to the deformation portion 23. Compare in the connected mode of nut seat and disk seat of correlation technique, the embodiment of the utility model provides a nut seat 3 adopts integrative structural design, has the advantage of convenient processing. In addition, the connecting part 32 and the sleeve part 31 are of an integral structure, so that a metal insert is omitted, and the material cost is reduced. Also, the coaxiality of the connecting portion 32 and the sleeve portion 31 is improved.

The housing 1 may include a tube portion 11 and a cover 12, the cover 12 being provided at one end of the tube portion 11. For example, the cover 12 and the tube 11 may be connected by welding, such as laser welding, but not limited thereto.

The valve seat 2 is connected to the housing 1, and the valve seat 2 and the housing 1 together form a chamber 13. Specifically, the valve seat 2 is connected to the other end of the pipe portion 11, for example, by welding.

The valve seat 2 is also connected to a first connection pipe 91 and a second connection pipe 92. Valve port 21 of valve seat 2 is disposed between first connection pipe 91 and second connection pipe 92. When valve needle 5 blocks valve port 21, first connection pipe 91 and second connection pipe 92 are not in conduction. When the valve needle 5 does not block the valve port 21, the first connection pipe 91 and the second connection pipe 92 are communicated.

The deformation portion 23 is provided at an opening edge of the recess 22. Specifically, the recess 22 includes a bottom 221 and a side 222, the side 222 surrounding an outer edge of the bottom 221 and extending axially upward. The deformation 23 is arranged at an end of the side 222 facing away from the bottom 221. Since the connecting portion 32 of the nut seat 3 is protrudingly provided on the outer peripheral surface of the sleeve portion 31, when the connecting portion 32 is provided in the recess 22, the deforming portion 23 can axially stop the connecting portion 32 radially inwardly so that the connecting portion 32 is confined in the recess 22, preventing the nut seat 3 from being axially separated from the valve seat 2.

In one embodiment, the deformation portion 23 has an annular structure and surrounds the outer periphery of the sleeve portion 31 of the nut holder 3.

The bottom 221 of the valve seat 2 further has a through hole 25 in the thickness direction, and the valve needle 5 is inserted through the through hole 25.

In one embodiment, the valve seat 2 is a metal piece.

With continued reference to fig. 1 and 2, the side portion 222 has a greater wall thickness than the deformation portion 23. Thus, the deformation portion 23 is more easily deformed when the nut holder 3 is coupled to the valve seat 2. Specifically, the nut seat 3 may be riveted to the valve seat 2 by press fitting. After the connecting portion 32 is mounted in the recess 22 of the valve seat 2, the deformation portion 23 is pressed in the axial direction, so that the deformation portion 23 can be deformed in the radial direction, and finally, the caulking is performed.

The sleeve portion 31 includes a threaded section 311, a first guide section 312 and a second guide section 313. The first guide section 312 is disposed at one end of the threaded section 311, and the second guide section 313 is disposed at the other end of the threaded section 311. The threaded section 311 has an internal thread structure, which is screwed with the external thread structure of the screw 4. When the coil is electrified, the magnetic rotor 6 can rotate around the axis of the magnetic rotor, so that the screw rod 4 is driven to synchronously rotate. When the screw rod 4 and the threaded section 311 of the sleeve portion 31 rotate relatively through the threaded structure, the screw rod 4 can move axially relative to the nut seat 3, and further the valve needle 5 is driven to move axially, so that the opening degree of the valve port 21 is adjusted.

The first guide section 312 is movably arranged along the axial lead screw 4. The valve needle 5 is movably arranged through the second guide section 313 in the axial direction. Part of the second guide section 313 is arranged through the through-opening 25 of the valve seat 2.

The screw 4 further comprises a receiving groove 41. The electronic expansion valve further comprises an elastic part 81, wherein the elastic part 81 is arranged in the accommodating groove 41, one end of the elastic part is abutted with the groove bottom of the accommodating groove 41, and the other end of the elastic part is abutted with the valve needle 5, so that the valve needle 5 has a tendency of being far away from the screw rod 4. One end of the needle 5 is defined in the accommodation groove 41.

By providing the elastic member 81 between the screw 4 and the valve needle 5, a soft contact rather than a hard contact between the valve needle 5 and the screw 4 can be achieved. When the screw rod 4 drives the valve needle 5 to block the valve port 21, due to the action of the elastic element 81, in the process that the screw rod 4 continues to move downwards, the valve needle 5 does not continue to move downwards, but the elastic element 81 is compressed, so that the valve needle 5 is ensured not to be locked on the valve port 21, and the screw rod 4 and the threaded section 311 are not locked in a threaded manner. Thus, when moving in the opposite direction, the screw 4 and the threaded section 311 can still easily rotate, and the valve needle 5 is driven to move upwards to open the valve port 21.

In one embodiment, the elastic member 81 is a compression spring, but not limited thereto.

In one embodiment, the electronic expansion valve further includes a limiting member 93, and the limiting member 93 is disposed on a groove wall of the receiving groove 41 and adjacent to a notch of the receiving groove 41. The end of the valve needle 5 is provided with a flange, and the flange is matched with the limiting piece 93, so that the end of the valve needle 5 with the flange can be limited in the accommodating groove 41, and the valve needle 5 is prevented from falling out of the accommodating groove 41.

For example, the position-limiting member 93 may be in the shape of a sleeve, and the outer wall surface thereof is connected to the groove wall of the accommodating groove 41 and is sleeved on the outer circumference of the valve needle 5.

The coupling portion 32 and the threaded section 311 are axially offset. Thus, when the connecting portion 32 is fitted into the recess 22 of the valve seat 2, the threaded section 311 is prevented from being deformed by being pressed.

As shown in fig. 3 and 4, fig. 3 is a perspective view of a nut holder 3 according to an embodiment of the present invention. Fig. 4 shows a cross-sectional view of the nut holder 3 according to an embodiment of the present invention. The nut holder 3 also has a balance passage 82, and the balance passage 82 penetrates the inner peripheral surface of the sleeve portion 31 and the outer peripheral surface of the connecting portion 32.

By the provision of the balancing passage 82, the space in the valve seat 2 is made to communicate with the chamber 13, so that the valve needle 5 is not subjected to resistance due to an imbalance of air pressure during its axial movement.

A limiting structure is arranged between the outer peripheral surface of the connecting part 32 and the concave part 22 and is used for limiting the circumferential rotation of the nut seat 3 and the valve seat 2.

In one embodiment, as shown in fig. 1 and 3, the limiting structure includes a first plane 321, and the first plane 321 is disposed on the connecting portion 32 and is attached to the concave portion 22. The irregular deformation of the side 222 of the concave portion 22 can be fit with the first plane 312 to stop the rotation of the nut holder 3.

Of course, it will be appreciated that in other embodiments, the spacing structure may also include a protrusion and a slot that mates with the protrusion. The protrusion may be provided on one of the connection portion 32 and the recess 22, and the groove may be provided on the other of the connection portion 32 and the recess 22.

In one embodiment, the nut seat 3 may be a plastic part and may be formed by injection molding. Because the utility model discloses nut seat 3 does not have metal insert, so injection molding process simplifies more.

In one embodiment, the nut seat 3 may be made of polyphenylene sulfide (PPS), but not limited thereto.

The utility model discloses electronic expansion valve still includes backstop subassembly 7, and backstop subassembly 7 sets up in cavity 13, and connects at closing cap 12 for inject lead screw 4 along axial displacement range.

The stopper assembly 7 includes a winding post 71, a spring guide 72, a stopper ring 73, and a connecting member 74, and one end of the winding post 71 is connected to an inner wall surface of the cap 12 and extends in the axial direction. The spring guide 72 is spirally wound around the outer periphery of the winding post 71, and both ends of the spring guide 72 have a first stopper 76 and a second stopper 75, respectively. The connecting piece 74 is connected with the screw 4. The stop ring 73 abuts against the connecting piece 74 and is spirally wound around the outer periphery of the winding post 71. While the stop ring 73 is capable of helical movement within the helical groove formed in the spring guide 72.

When the screw 4 rotates about its axis, the stop ring 73 is wound along the spiral groove of the spring rail 72. When the stop ring 73 contacts the first stop 76 during the process of moving the lead screw 4 toward the cover 12, which represents that the lead screw 4 moves to the upper limit point, the lead screw 4 cannot move upward. When the stop ring 73 contacts the second stop portion 75 during the process of moving the lead screw 4 away from the cover 12, which represents that the lead screw 4 moves to the lower limit point, the lead screw 4 cannot move downwards any more.

It is understood that the various embodiments/implementations provided by the present invention can be combined without contradiction, and are not illustrated herein.

In the embodiments of the present invention, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

In the description of the present specification, the terms "one embodiment," "some embodiments," "specific embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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 to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. An electronic expansion valve, comprising:

a housing;

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

3. The electronic expansion valve according to claim 1, wherein the deformation portion is provided at an opening edge of the recess.

4. An electronic expansion valve according to claim 3, wherein the recess comprises a bottom portion and a side portion, the side portion having a wall thickness larger than a wall thickness of the deformation portion.

5. The electronic expansion valve according to claim 2, wherein the sleeve portion comprises:

6. The electronic expansion valve of claim 5, wherein the lead screw further comprises a receiving groove;

7. The electronic expansion valve of claim 5, wherein the connection portion and the threaded section are axially offset.

8. The electronic expansion valve according to claim 1, further comprising a stopper structure between the outer circumferential surface of the connecting portion and the recess portion, the stopper structure being configured to restrict circumferential rotation of the nut seat and the valve seat.

9. The electronic expansion valve of claim 8, wherein the limiting structure comprises a first plane, and the first plane is disposed on the connecting portion and attached to the concave portion.

10. The electronic expansion valve according to claim 1, wherein the nut seat further has a balance passage that penetrates an inner peripheral surface of the sleeve portion and an outer peripheral surface of the connecting portion; and/or the presence of a gas in the gas,

the nut seat is a plastic piece.