WO2023143027A1

WO2023143027A1 - Nut seat and electronic expansion valve

Info

Publication number: WO2023143027A1
Application number: PCT/CN2023/071414
Authority: WO
Inventors: 陈勇好; 徐冠军; 姚坚
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2022-01-28
Filing date: 2023-01-09
Publication date: 2023-08-03
Also published as: CN219366819U

Abstract

A nut seat (3) and an electronic expansion valve. The nut seat (3) comprises a threaded member (31) and a nesting member (32), the threaded member (31) being intended to be in threaded connection to a lead screw (4) of an electronic expansion valve, the outer peripheral surface of the threaded member (31) being provided with a first tooth groove structure (314), the nesting member (32) sleeving the periphery of the threaded member (31) and being intended to be connected to a valve seat (2) of the electronic expansion valve, the inner peripheral surface of the nesting member (32) being provided with a second tooth groove structure (322), and the second tooth groove structure (322) fitting with the first tooth groove structure (314). The threaded member (31) and the nesting member (32) are combined by means of the first tooth groove structure (314) and the second tooth groove structure (322).

Description

Nut seat and electronic expansion valve

cross reference

This disclosure claims the priority of the Chinese patent application with application number 202220243115.3 and titled "Nut Seat and Electronic Expansion Valve" filed on January 28, 2022, the entire content of which is incorporated herein by reference.

technical field

The present disclosure relates to the technical field of refrigeration systems, in particular, to a nut seat and an electronic expansion valve.

Background technique

With the popularization of frequency conversion air conditioners, electronic expansion valves are the main components of frequency conversion air conditioners, and their performance has a great impact on the comfort and energy saving of air conditioners. The nut seat of the electronic expansion valve in the related art includes a threaded part made of plastic and a nesting part sheathed on the outer periphery of the threaded part. The threaded part is used for threaded connection with the screw rod and is connected with the valve seat through the nesting part. However, the bonding strength of the screw and the insert in the related art is insufficient.

Contents of the invention

Embodiments of the present disclosure provide a nut seat and an electronic expansion valve to improve the bonding strength between the threaded part and the nested part.

The nut seat of the embodiment of the present disclosure is applied to an electronic expansion valve, and the nut seat includes a threaded part and a nesting part, and the threaded part is used for threaded connection with the screw rod of the electronic expansion valve; the outer peripheral surface of the threaded part has The first tooth groove structure; the nest is sleeved on the outer periphery of the threaded member for connecting with the valve seat of the electronic expansion valve; the inner peripheral surface of the nest has a second tooth groove structure, the The second alveolar structure cooperates with the first alveolar structure.

The embodiments in the above disclosure have at least the following advantages or beneficial effects:

The nut seat of the embodiment of the present disclosure includes a threaded part and a nesting part sleeved on the outer periphery of the threaded part, and the threaded part and the nesting part are combined with the first toothed groove structure through the second toothed groove structure. In this way, the bonding area between the threaded part and the nesting part is increased, thereby improving the bonding strength of the threaded part and the nesting part, and ensuring the working stability of the nut seat. In addition, since the second alveolar structure of the nesting member can be formed at one time without cutting, the forming efficiency is significantly improved and the cost is reduced.

Description of drawings

FIG. 1 shows a cross-sectional view of an electronic expansion valve according to an embodiment of the present disclosure.

FIG. 2 shows a perspective view of a nut seat according to an embodiment of the present disclosure.

Fig. 3 shows a cross-sectional view of a nut holder according to an embodiment of the present disclosure.

FIG. 4 shows a perspective view of a threaded member according to an embodiment of the present disclosure.

FIG. 5 shows a perspective view of a nest of embodiments of the present disclosure.

Wherein, the reference signs are explained as follows:

1. Outer cover

11. Pipeline

12. Cover

13. Chamber

2. Valve seat

21. Valve port

22. Concave

221. Bottom

222. Side

25. Through hole

3. Nut seat

31. Screw parts

311, thread segment

312. The first guiding section

313. The second guide section

314. The first alveolar structure

32. Nesting kit

321. First Plane

322. Second alveolar structure

323. Bottom Wall

324: perforation

325. side wall

326: Gap

33. The first step structure

34. The second step structure

4. Screw rod

41. Accommodating tank

5. Valve needle

6. Magnetic rotor

7. Stop component

71. Around the column

72. Spring guide rail

73. Stop ring

74. Connector

75. The second stopper

76. The first stopper

81. Elastic parts

82. Balance channel

91. The first connecting pipe

92. Second connecting pipe

93. Limiting parts

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many 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 descriptions will be omitted.

As shown in FIG. 1 , FIG. 1 shows a cross-sectional view of an electronic expansion valve according to an embodiment of the present disclosure. The electronic expansion valve in the embodiment of the present disclosure includes a housing 1 , a coil (not shown in the figure), a valve seat 2 , a nut seat 3 , a screw rod 4 , a valve needle 5 and a magnetic rotor 6 .

It can be understood that the terms "including" and "having" and any variations thereof in the embodiments of the present disclosure are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or components inherent in those processes, methods, products, or devices.

The valve seat 2 is connected with the housing 1 and together with the housing 1 forms a chamber 13 . The valve seat 2 has a valve port 21 and a recess 22 corresponding to the valve port 21 . The coil is provided on the outer periphery of the housing 1 .

The nut seat 3 is arranged in the cavity 13 and is arranged in the recess 22 . The screw rod 4 is arranged in the chamber 13 and screwed with the nut seat 3 . The valve needle 5 is connected with the threaded rod 4 for cooperating with the valve port 21 to adjust the opening 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 screw rod 4 .

When the coil is energized, the magnetic rotor 6 can rotate around its own axis, thereby driving the screw mandrel 4 to rotate synchronously. When the threaded rod 4 and the nut seat 3 rotate relative to each other through the thread structure, the threaded rod 4 can move axially relative to the nut seat 3 , and then drive the valve needle 5 to move in the axial direction to realize the adjustment of the opening of the valve port 21 .

The housing 1 may include a tube portion 11 and a cover 12 disposed at one end of the tube portion 11 . For example, the connection between the cover 12 and the tube portion 11 may be 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 jointly 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 with the first connecting pipe 91 and the second connecting pipe 92 . The valve port 21 of the valve seat 2 is disposed between the first connecting pipe 91 and the second connecting pipe 92 . When the valve needle 5 blocks the valve port 21 , the first connecting pipe 91 and the second connecting pipe 92 are not connected. When the valve needle 5 is not blocking the valve port 21 , the first connecting pipe 91 and the second connecting pipe 92 are connected.

The concave portion 22 of the valve seat 2 includes a bottom portion 221 and a side portion 222 , the side portion 222 surrounds the outer edge of the bottom portion 221 and extends axially upward. The bottom 221 of the valve seat 2 also has a through hole 25 along the thickness direction, and the valve needle 5 passes through the through hole 25 .

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

Optionally, when the lower end of the nut seat 3 is disposed in the recess 22, the upper end of the side portion 222 can be deformed radially inward to limit the nut seat 3 in the recess 22, preventing the nut seat 3 from axially contacting the valve. Seat 2 disengages.

Optionally, the wall thickness of the side portion 222 of the valve seat 2 gradually becomes thinner from bottom to top. In this way, when the nut seat 3 is connected with the valve seat 2, the upper end of the side portion 222 is more likely to be deformed. Specifically, the nut seat 3 and the valve seat 2 may be riveted together by means of press fitting. After the nut seat 3 is installed in the concave portion 22 of the valve seat 2, the side portion 222 of the valve seat 2 is pressed in the axial direction, so that the side portion 222 can be deformed in the radial direction, and riveting is finally realized.

The nut seat 3 also has a balance channel 82 , and the balance channel 82 runs through the inner and outer peripheral surfaces of the nut seat 3 .

Through the arrangement of the balance passage 82, the space in the valve seat 2 can be communicated with the chamber 13, so that the valve needle 5 will not be subjected to resistance due to air pressure imbalance during the axial movement.

The screw rod 4 also includes a receiving groove 41 . The electronic expansion valve also includes an elastic member 81, which is arranged in the receiving groove 41, and one end of the elastic member abuts against the bottom of the accommodating groove 41, and the other end abuts against the valve needle 5, so that the valve needle 5 has a distance away from the screw rod 4. the trend of. One end of the valve needle 5 is defined in the receiving groove 41 .

By arranging the elastic member 81 between the screw rod 4 and the valve needle 5, the valve needle 5 and the screw rod 4 can be in soft contact instead of hard contact. When the screw rod 4 drives the valve needle 5 to block the valve port 21, due to the action of the elastic member 81, when the screw rod 4 continues to move downward, the valve needle 5 will not continue to move downward, but will compress the elastic 81, so as to ensure that the valve needle 5 will not be locked on the valve port 21, and the screw rod 4 and the nut seat 3 will not be screwed into lock. In this way, when moving in the opposite direction, the screw rod 4 and the nut seat 3 can still rotate easily, and then drive the valve needle 5 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 the groove wall of the receiving groove 41 and adjacent to the notch of the receiving groove 41 . One end of the valve needle 5 is provided with a flange, and the flange cooperates with the stopper 93 to limit the end of the valve needle 5 with the flange in the receiving groove 41 to prevent the valve needle 5 from coming out of the receiving groove 41 .

For example, the limiting member 93 may be in the shape of a sleeve, the outer wall of which is connected to the groove wall of the receiving groove 41 and sleeved on the outer periphery of the valve needle 5 .

The electronic expansion valve of the embodiment of the present disclosure further includes a stopper assembly 7 , which is arranged in the cavity 13 and connected to the cover 12 to limit the movement range of the screw rod 4 in the axial direction.

The stop assembly 7 includes a post 71 , a spring rail 72 , a stop ring 73 and a connecting piece 74 . One end of the post 71 is connected to the inner wall of the cover 12 and extends in the axial direction. The spring guide rail 72 is helically wound around the outer periphery of the column 71 . The connecting piece 74 is connected with the screw rod 4 . The stop ring 73 abuts against the connecting member 74 and is helically wound around the outer circumference of the column 71 , and the two ends of the spring guide rail 72 respectively have a first stop portion 76 and a second stop portion 75 . At the same time, the stop ring 73 can spirally move in the spiral groove formed by the spring guide rail 72 .

When the threaded mandrel 4 rotates around its own axis, the stop ring 73 coils along the helical groove of the spring rail 72 . During the movement of the screw rod 4 towards the cover 12 , when the stop ring 73 touches the first stop portion 76 , it means that the screw rod 4 has moved to the upper limit point, and the screw rod 4 cannot continue to move upward at this time. When the threaded rod 4 moves away from the cover 12 , when the stop ring 73 touches the second stop portion 75 , it means that the threaded rod 4 has moved to the lower limit point, and the threaded rod 4 cannot continue to move downwards at this time.

As shown in FIG. 2 to FIG. 5 , FIG. 2 shows a perspective view of a nut seat according to an embodiment of the present disclosure. Fig. 3 shows a cross-sectional view of a nut holder according to an embodiment of the present disclosure. FIG. 4 shows a perspective view of a threaded member according to an embodiment of the present disclosure. FIG. 5 shows a perspective view of a nest of embodiments of the present disclosure.

The nut seat 3 of the embodiment of the present disclosure includes a threaded part 31 and a nested part 32 . The threaded part 31 is used for threaded connection with the screw rod 4 ; the outer peripheral surface of the threaded part 31 has a first alveolar structure 314 . The nesting part 32 is sleeved on the outer periphery of the threaded part 31 for connecting with the valve seat 2 . The inner peripheral surface of the nesting part 32 has a second tooth groove structure 322 , and the second tooth groove structure 322 is matched with the first tooth groove structure 314 .

It can be understood that the cooperation between the second alveolar structure 322 and the first alveolar structure 314 means that the teeth of the first alveolar structure 314 extend into the grooves of the second alveolar structure 322 , and the teeth of the second alveolar structure 322 The tooth portion extends into the groove portion of the first tooth groove structure 314 .

The nut seat 3 of the embodiment of the present disclosure includes a threaded part 31 and a nesting part 32 sleeved on the outer periphery of the threaded part 31, and the threaded part 31 and the nesting part 32 are connected to the first through the second alveolar structure 322. The alveolar structure 314 is combined. In this way, the bonding area between the threaded part 31 and the nesting part 32 is increased, thereby improving the bonding strength of the threaded part 31 and the nesting part 32 , ensuring the working stability of the nut seat 3 . In addition, since the second alveolar structure 322 of the nesting member 32 can be formed at one time without cutting, the forming efficiency is significantly improved and the cost is reduced.

It should be noted that one-shot molding refers to injection molding, compression molding, and the like.

The nest 32 includes a bottom wall 323 and a side wall 325 . The bottom wall 323 has a through hole 324 along the thickness direction, and the screw member 31 passes through the through hole 324 . The side wall 325 surrounds the edge of the bottom wall 323 and extends upward from the bottom wall 323 . The second alveolar structure 322 is disposed on the inner surface of the side wall 325 .

The side wall 325 defines a notch 326 , the notch 326 runs through the inner wall surface and the outer wall surface of the side wall 325 , and runs through the top surface of the side wall 325 away from the bottom wall 323 . The number of gaps 326 is one or more, wherein "multiple" means two or more.

The threaded part 31 has a balance channel 82 , and the balanced channel 82 runs through the inner and outer peripheral surfaces of the threaded part 31 . The notch 326 is set corresponding to the position of the balance channel 82 .

In one embodiment, the side wall 325 has two notches 326 , one of which is corresponding to the balance channel 82 . The two notches 326 are located on the diameter of the circle surrounded by the sidewall 325 and separate the second alveolar structure 322 into two parts.

In this embodiment, by providing two symmetrically arranged notches 326 on the side wall 325 , the molding pressure on the nesting member 32 during molding is more uniform.

Of course, it can be understood that in other embodiments, the number of notches 326 on the side wall 325 can also be one, three or other numbers.

It can be understood that the number of notches 326 is greater than or equal to the number of balancing channels 82 .

As shown in FIG. 3 , a second stepped structure 34 is formed at the junction of the bottom wall 323 and the side wall 325 , and the outer periphery of the screw member 31 has a first stepped structure 33 matching the second stepped structure 34 .

By setting the matched first stepped structure 33 and the second stepped structure 34 at the position between the threaded part 31 and the nested part 32, the bonding area between the threaded part 31 and the nested part 32 can be further increased, and the combination can be improved. strength.

The threaded member 31 includes a threaded section 311 , a first guiding section 312 and a second guiding section 313 . The first guiding section 312 is arranged at one end of the threaded section 311 , and the second guiding section 313 is arranged at the other end of the threaded section 311 . The threaded section 311 has an internal thread structure, and the internal thread structure is screwed with the external thread structure of the screw rod 4 . When the coil is energized, the magnetic rotor 6 can rotate around its own axis, thereby driving the screw mandrel 4 to rotate synchronously. When the screw 4 and the threaded section 311 of the screw 31 rotate relative to each other through the thread structure, the screw 4 can move axially relative to the nut seat 3, and then drive the valve needle 5 to move in the axial direction to realize the adjustment of the opening of the valve port 21 .

The threaded rod 4 is movably passed through the first guide section 312 along the axial direction. The valve needle 5 is movably passed through the second guide section 313 along the axial direction. A part of the second guide section 313 passes through the through hole 25 of the valve seat 2 .

The first tooth groove structure 314 is disposed on the outer periphery of the second guiding section 313 . The balance channel 82 is disposed on the second guide section 313 and runs through the inner wall surface and the outer wall surface of the second guide section 313 .

The nesting part 32 and the threaded segment 311 are axially staggered. In this way, when the insert 32 is installed into the recess 22 of the valve seat 2, the threaded section 311 can be prevented from being squeezed and deformed.

As shown in FIG. 5 , there is a limiting structure between the outer peripheral surface of the nesting member 32 and the recess 22 , and the limiting structure is used to limit the circumferential rotation of the nut seat 3 and the valve seat 2 .

In one embodiment, the limiting structure includes a first plane 321 , the first plane 321 is disposed on the outer peripheral surface of the side wall 325 of the nest 32 , and the first plane 321 faces the side wall of the recess 22 of the valve seat 2 . Through the action of the first plane 321 and the sidewall of the recess 22 , the nesting part 32 and the valve seat 2 can be prevented from rotating in the circumferential direction.

The number of first planes 321 may be multiple, wherein "multiple" means two or more.

In other embodiments, the limiting structure may also include a protrusion and a groove that cooperates with the protrusion. Protrusions may be provided on the outer peripheral surface of the nest 32 , and grooves may be provided on the side wall 2 of the recess 22 .

The nesting part 32 is a metal part formed by powder metallurgy die-casting or injection molding. Based on the above, since the nesting part 32 has the second alveolar structure 322 exposed outside, the nesting part 32 can be made by one-time molding process such as die-casting or injection molding without using cutting process, which significantly improves the molding process. efficiency.

The threaded part 31 can be a plastic part, and the nesting part 32 can be a metal part. The threaded part 31 and the nested part 32 are integrally injection molded. The use of molds to process the threaded part 31 can ensure the thread quality, and injection molding not only has high efficiency, but also has better thread quality stability.

In one embodiment, the screw 31 may be made of polyphenylene sulfide (PPS), but not limited thereto.

It can be understood that, when the nesting part 32 has the second alveolar structure 322, the nesting part 32 is put into the mold, and then the injection molding material is poured into the mold cavity of the mold to form the threaded part 31 and the nesting part 32 For an integral part, when the injection molding material enters the second alveolar structure 322 of the nesting part 32 , the plastic material will fully fill the second alveolar structure 322 , and then form the first alveolar structure 314 correspondingly on the outer periphery of the threaded part 31 . In this way, the bonding area between the threaded part 31 and the nesting part 32 can be increased, and the bonding strength can be improved.

It can be understood that the various embodiments/implementations provided in the present disclosure can be combined with each other if no contradiction arises, and no further examples are given here.

In the disclosed embodiments, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance; the term "plurality" refers to two or two more than one, unless otherwise expressly limited. The terms "installation", "connection", "connection", "fixed" and other terms should be interpreted in a broad sense, for example, "connection" can be fixed connection, detachable connection, or integral connection; "connection" can be directly or indirectly through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the disclosed embodiments according to specific situations.

In the description of the disclosed embodiments, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear" are based on those shown in the accompanying drawings. Orientation or positional relationship is only for the convenience of describing the disclosed embodiments and simplifying the description, and does not indicate or imply that the referred device or unit must have a specific orientation, be constructed and operated in a specific orientation, and therefore, cannot be construed as a reference to the disclosed implementation. Example limitations.

In the description of this specification, descriptions of the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in the disclosed implementation. In at least one embodiment or example of an example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above are only preferred embodiments of the disclosed embodiments, and are not intended to limit the disclosed embodiments. For those skilled in the art, various modifications and changes may be made to the disclosed embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the disclosed embodiments shall be included in the protection scope of the disclosed embodiments.

Claims

A nut seat applied to an electronic expansion valve, characterized in that the nut seat includes:

a threaded part, the outer peripheral surface of the threaded part has a first alveolar structure; and

A nesting piece, sleeved on the outer periphery of the threaded member, for connecting with the valve seat of the electronic expansion valve; the inner peripheral surface of the nesting piece has a second tooth groove structure, and the second tooth groove structure Cooperate with the first alveolar structure.
The nut seat according to claim 1, wherein the nesting part comprises:

the bottom wall has a perforation along the thickness direction, and the screw is passed through the perforation; and

A side wall, the side wall surrounds the edge of the bottom wall, and the second alveolar structure is arranged on the inner wall surface of the side wall.
The nut seat according to claim 2, wherein the side wall is provided with a notch, and the notch runs through the inner wall surface and the outer wall surface of the side wall, and runs through the top of the side wall away from the bottom wall. noodle;

The threaded part has a balance channel, and the balanced channel runs through the inner peripheral surface and the outer peripheral surface of the threaded part; the notch is set corresponding to the position of the balanced channel.
The nut holder according to claim 3, wherein the threaded member has at least one balancing channel, and the side wall has at least one notch, and the number of notches is greater than or equal to the balancing channel number, one of the gaps is set corresponding to the balance channel.
The nut seat according to claim 2, wherein a second stepped structure is formed at the junction of the bottom wall and the side wall, and the outer periphery of the screw has a first stepped structure matched with the second stepped structure. a stepped structure.
The nut seat according to claim 1, wherein the threaded part comprises:

A threaded section, used for threaded connection with the screw rod of the electronic expansion valve;

a first guide section, arranged at one end of the threaded section, for passing the screw rod through;

The second guiding section is arranged at the other end of the threaded section, and is used for the needle of the electronic expansion valve to pass through; the first tooth groove structure is arranged on the outer periphery of the second guiding section.
The nut seat according to claim 6, wherein the threaded part also has a balance channel, the balance channel is arranged on the second guide section, and runs through the inner wall surface and the outer surface of the second guide section. wall.
The nut holder according to claim 1, wherein the threaded part is a plastic part, the nesting part is a metal part, and the threaded part and the nesting part are integrally injection molded.
The nut seat according to claim 1, characterized in that, the nesting part is a metal part formed by powder metallurgy die-casting or an injection-molded metal part.
An electronic expansion valve, characterized by comprising the nut seat according to any one of claims 1-9.