CN219366819U

CN219366819U - Nut seat and electronic expansion valve

Info

Publication number: CN219366819U
Application number: CN202220243115.3U
Authority: CN
Inventors: 陈勇好; 徐冠军; 姚坚
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: 2023-07-18
Anticipated expiration: 2032-01-28
Also published as: WO2023143027A1; KR20240140126A

Abstract

The utility model discloses a nut seat and an electronic expansion valve, wherein the nut seat comprises a threaded piece and an embedded piece, and the threaded piece is used for being in threaded connection with a screw rod of the electronic expansion valve; the outer peripheral surface of the screw member is provided with a first tooth groove structure; the embedded part is sleeved on the periphery of the threaded part and is used for being connected with a valve seat of the electronic expansion valve; the inner peripheral surface of the embedded piece is provided with a second tooth groove structure, and the second tooth groove structure is matched with the first tooth groove structure. The threaded piece and the nested piece are combined with the first tooth groove structure through the second tooth groove structure. Therefore, the bonding area between the threaded piece and the nested piece is increased, the bonding strength of the threaded piece and the nested piece is further improved, and the working stability of the nut seat is ensured. In addition, the second tooth groove structure of the embedded piece can be formed at one time without cutting, so that the forming efficiency is obviously improved, and the cost is reduced.

Description

Nut seat and electronic expansion valve

Technical Field

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

Background

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 has great influence on the comfort and energy conservation of the air conditioner. The nut seat of the electronic expansion valve in the related art comprises a threaded piece made of plastic and an embedded piece sleeved on the periphery of the threaded piece, wherein the threaded piece is in threaded connection with the screw rod and is connected with the valve seat through the embedded piece. However, the screw and the box in the related art have insufficient bonding strength.

Disclosure of Invention

The embodiment of the utility model provides a nut seat and an electronic expansion valve, which are used for improving the bonding strength of a threaded piece and a nested piece.

The nut seat provided by the embodiment of the utility model is applied to an electronic expansion valve, and comprises a threaded piece and an embedded piece, wherein the threaded piece is in threaded connection with a screw rod of the electronic expansion valve; the outer peripheral surface of the screw member is provided with a first tooth groove structure; the embedded part is sleeved on the periphery of the threaded part and is used for being connected with the valve seat of the electronic expansion valve; the inner peripheral surface of the nesting piece is provided with a second tooth groove structure, and the second tooth groove structure is matched with the first tooth groove structure.

According to some embodiments of the utility model, the nest comprises:

a bottom wall having a through hole in a thickness direction, the screw being penetrated in the through hole; and

the side wall surrounds the edge of the bottom wall, and the second tooth groove structure is arranged on the inner wall surface of the side wall.

According to some embodiments of the utility model, the side wall is provided with a notch extending through an inner wall surface and an outer wall surface of the side wall and through a top surface of the side wall facing away from the bottom wall;

the screw has a balance passage penetrating through an inner peripheral surface and an outer peripheral surface of the screw; the notch is arranged corresponding to the position of the balance channel.

According to some embodiments of the utility model, the screw has at least one balancing channel, the side wall has at least one notch, the number of notches is greater than or equal to the number of balancing channels, and one of the notches is disposed corresponding to the balancing channel.

According to some embodiments of the utility model, a second step is formed at the junction of the bottom wall and the side wall, and the periphery of the screw has a first step cooperating with the second step.

According to some embodiments of the utility model, the screw comprises:

the thread section is used for being in threaded connection with a screw rod of the electronic expansion valve;

the first guide section is arranged at one end of the threaded section and used for the screw rod to penetrate through;

the second guide section is arranged at the other end of the thread section and used for allowing a valve needle of the electronic expansion valve to penetrate through; the first tooth slot structure is arranged on the periphery of the second guide section.

According to some embodiments of the utility model, the screw further has a balancing passage provided on the second guide section and penetrating an inner wall surface and an outer wall surface of the second guide section.

According to some embodiments of the utility model, the threaded member is a plastic member and the nest is a metal member, the threaded member and the nest being formed by integral injection molding.

According to some embodiments of the utility model, the nest is a metal part die-cast by powder metallurgy or an injection molded metal part.

The electronic expansion valve provided by the embodiment of the utility model comprises the nut seat.

One embodiment of the above utility model has at least the following advantages or benefits:

the nut seat comprises a threaded piece and a nested piece sleeved on the periphery of the threaded piece, and the threaded piece and the nested piece are combined with a first tooth groove structure through a second tooth groove structure. Therefore, the bonding area between the threaded piece and the nested piece is increased, the bonding strength of the threaded piece and the nested piece is further improved, and the working stability of the nut seat is ensured. In addition, the second tooth groove structure of the embedded piece can be formed at one time without cutting, so that the forming efficiency is obviously improved, and the cost is reduced.

Drawings

Fig. 1 shows a cross-sectional view of an electronic expansion valve according to an embodiment of the present utility model.

Fig. 2 shows a perspective view of a nut seat according to an embodiment of the present utility model.

Fig. 3 shows a cross-sectional view of a nut seat according to an embodiment of the present utility model.

Fig. 4 shows a perspective view of a screw according to an embodiment of the utility model.

Fig. 5 shows a perspective view of a nest of embodiments of the present utility model.

Wherein reference numerals are as follows:

1. outer cover

11. Pipe part

12. Sealing cover

13. Chamber chamber

2. Valve seat

21. Valve port

22. Concave part

221. Bottom part

222. Side portion

25. Through hole

3. Nut seat

31. Screw element

311. Thread segment

312. First guide section

313. Second guide section

314. First tooth groove structure

32. Inlay set

321. First plane

322. Second tooth slot structure

323. Bottom wall

324. Perforation

325. Side wall

326. Notch

33. First step structure

34. Second step structure

4. Screw rod

41. Accommodating groove

5. Valve needle

6. Magnetic rotor

7. Stop assembly

71. Winding column

72. Spring guide rail

73. Check ring

74. Connecting piece

75. Second stop part

76. First stop part

81. Elastic piece

82. Balance channel

91. First connecting pipe

92. Second connecting pipe

93. Limiting piece

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can 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 the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

As shown in fig. 1, fig. 1 is a cross-sectional view of an electronic expansion valve according to an embodiment of the present utility model. The electronic expansion valve of the embodiment of the utility model comprises an outer cover 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 will be understood that the terms "comprising," "including," and "having," and any variations thereof, are intended to cover non-exclusive inclusions in the embodiments of the utility model. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may alternatively include other steps or elements not listed or inherent to such process, method, article, or apparatus.

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

The nut seat 3 is disposed in the chamber 13 and in the recess 22. The screw rod 4 is arranged in the cavity 13 and is in threaded connection with the nut seat 3. The valve needle 5 is connected with the screw rod 4 and is used for being matched 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 with the screw rod 4.

When the coil is electrified, the magnetic rotor 6 can rotate around the axis of the coil, so that the screw rod 4 is driven to synchronously rotate. When the screw rod 4 and the nut seat 3 relatively rotate through the threaded structure, the screw rod 4 can axially move relative to the nut seat 3, and then the valve needle 5 is driven to axially move, so that the opening of the valve port 21 is adjusted.

The housing 1 may include a tube portion 11 and a cover 12, one end of the tube portion 11 where the cover 12 is provided. 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. The valve port 21 of the valve seat 2 is disposed between the first connection pipe 91 and the second connection pipe 92. When the valve needle 5 closes the valve port 21, the first connection pipe 91 and the second connection pipe 92 are not conducted. When the valve needle 5 does not close the valve port 21, the first connection pipe 91 and the second connection pipe 92 are conducted.

The recess 22 of the valve seat 2 includes a bottom 221 and a side 222, and the side 222 surrounds the outer edge of the bottom 221 and extends upward in the axial direction. The bottom 221 of the valve seat 2 further has a through hole 25 in the thickness direction, and the needle 5 is inserted through the through hole 25.

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

Alternatively, when the lower end portion 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 define the nut seat 3 within the recess 22, preventing the nut seat 3 from being axially disengaged from the valve seat 2.

Alternatively, the wall thickness of the side 222 of the valve seat 2 is tapered from bottom to top. In this way, the upper end of the side 222 is more easily deformed when the nut seat 3 is coupled with the valve seat 2. Specifically, the nut seat 3 may be riveted to the valve seat 2 by press fitting. After the nut seat 3 is mounted in the recess 22 of the valve seat 2, the side 222 of the valve seat 2 is pressed in the axial direction, so that the side 222 can be deformed in the radial direction, and finally riveting is achieved.

The nut seat 3 further has a balance passage 82, and the balance passage 82 penetrates through the inner peripheral surface and the outer peripheral surface of the nut seat 3.

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

The screw 4 further comprises a receiving groove 41. The electronic expansion valve further includes an elastic member 81, and the elastic member 81 is disposed in the accommodation groove 41, with one end abutting against the groove bottom of the accommodation groove 41, and the other end abutting against the needle 5, so that the needle 5 has a tendency to be away from the lead screw 4. One end of the needle 5 is defined in the accommodation groove 41.

By providing the elastic member 81 between the lead screw 4 and the needle 5, soft contact, not hard contact, between the needle 5 and the lead screw 4 can be made. When the screw rod 4 drives the valve needle 5 to block the valve port 21, due to the action of the elastic piece 81, the valve needle 5 does not continuously move downwards in the process of continuously moving downwards of the screw rod 4, but the elastic piece 81 is compressed, so that the valve needle 5 is ensured not to be locked at the valve port 21, and the screw rod 4 and the nut seat 3 are not locked by threads. Thus, when moving in the opposite direction, the screw rod 4 and the nut seat 3 can still rotate easily, and then the valve needle 5 is driven to move upwards to open the valve port 21.

In an 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, where the limiting member 93 is disposed on a wall of the accommodating groove 41 and adjacent to a notch of the accommodating groove 41. One end of the valve needle 5 is provided with a flange, and the flange cooperates with the stopper 93 to define the end of the valve needle 5 having the flange in the accommodation groove 41, thereby preventing the valve needle 5 from being separated from the accommodation groove 41.

For example, the stopper 93 may have a sleeve shape, and its outer wall surface is connected to the groove wall of the accommodation groove 41 and is sleeved on the outer periphery of the needle 5.

The electronic expansion valve of the embodiment of the utility model further comprises a stop assembly 7, wherein the stop assembly 7 is arranged in the cavity 13 and is connected with the sealing cover 12 for limiting the movement range of the screw rod 4 along the axial direction.

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

When the screw rod 4 rotates about its own axis, the stopper 73 is wound along the spiral groove of the spring rail 72. During the movement of the screw 4 towards the cover 12, when the stop ring 73 contacts the first stop 76, which represents the movement of the screw 4 to the upper limit point, the screw 4 cannot continue to move upwards. During movement of the screw 4 away from the cover 12, when the stop ring 73 contacts the second stop 75, which represents movement of the screw 4 to the lower limit point, the screw 4 cannot continue to move downwardly.

As shown in fig. 2 to 5, fig. 2 is a perspective view showing a nut seat according to an embodiment of the present utility model. Fig. 3 shows a cross-sectional view of a nut seat according to an embodiment of the present utility model. Fig. 4 shows a perspective view of a screw according to an embodiment of the utility model. Fig. 5 shows a perspective view of a nest of embodiments of the present utility model.

The nut seat 3 of the embodiment of the present utility model includes a screw 31 and a nest 32. The screw 31 is used for being connected with the screw rod 4 in a threaded manner; the outer circumferential surface of the screw 31 has a first spline structure 314. The insert 32 is fitted around the outer periphery of the screw 31 for connection with the valve seat 2. The inner peripheral surface of the nest member 32 has a second spline structure 322, and the second spline structure 322 is matched with the first spline structure 314.

It is understood that the second tooth slot structure 322 cooperates with the first tooth slot structure 314 to mean that the tooth portion of the first tooth slot structure 314 extends into the groove portion of the second tooth slot structure 322, and the tooth portion of the second tooth slot structure 322 extends into the groove portion of the first tooth slot structure 314.

The nut seat 3 according to the embodiment of the present utility model includes a screw 31 and a nesting member 32 sleeved on the outer circumference of the screw 31, and the screw 31 and the nesting member 32 are coupled with the first spline structure 314 through a second spline structure 322. In this way, the bonding area between the screw 31 and the nesting member 32 is increased, so that the bonding strength of the screw 31 and the nesting member 32 is improved, and the working stability of the nut seat 3 is ensured. In addition, since the second tooth groove structure 322 of the insert 32 can be formed at one time without cutting, the forming efficiency is significantly improved and the cost is reduced.

The term "one-shot molding" refers to injection molding, compression molding, or the like.

Nest 32 includes a bottom wall 323 and a side wall 325. The bottom wall 323 has a through hole 324 in the thickness direction, and the screw 31 is inserted into the through hole 324. The side wall 325 surrounds the edge of the bottom wall 323 and extends upwardly from the bottom wall 323. The second spline structure 322 is disposed on an inner wall surface of the sidewall 325.

The side wall 325 is provided with a notch 326, the notch 326 penetrates through the inner wall surface and the outer wall surface of the side wall 325, and penetrates through the top surface of the side wall 325 facing away from the bottom wall 323. The number of notches 326 is one or more, where "plurality" refers to two or more.

The screw 31 has a balance passage 82, and the balance passage 82 penetrates the inner peripheral surface and the outer peripheral surface of the screw 31. The notch 326 is positioned to correspond to the location of the balance channel 82.

In one embodiment, the sidewall 325 has two notches 326, wherein one notch 326 is disposed corresponding to the balance channel 82. Two notches 326 are located on the diameter of the ring enclosed by the sidewall 325 and divide the second spline structure 322 into two parts.

In this embodiment, by providing two symmetrically disposed notches 326 in the sidewall 325, the mold pressure experienced by the nest 32 during molding is more uniform.

Of course, it is understood that in other embodiments, the number of notches 326 in the sidewall 325 may be one, three, or other numbers, etc.

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

As shown in fig. 3, a second step structure 34 is formed at the junction of the bottom wall 323 and the side wall 325, and the outer periphery of the screw 31 has a first step structure 33 that mates with the second step structure 34.

By providing the first step structure 33 and the second step structure 34 which are matched at the position between the screw 31 and the nest 32, the bonding area between the screw 31 and the nest 32 can be further increased, and the bonding strength can be improved.

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

The first guide section 312 is movably penetrated along the axial screw 4. The valve needle 5 is movably arranged through the second guide section 313 along the axial direction. Part of the second guide section 313 is provided through the through hole 25 of the valve seat 2.

The first spline structure 314 is provided at the outer circumference of the second guide section 313. The balance channel 82 is provided on the second guide section 313 and penetrates the inner wall surface and the outer wall surface of the second guide section 313.

The nest 32 and the thread segments 311 are axially offset. In this way, the threaded segment 311 is prevented from being deformed by compression when the nest 32 is installed into the recess 22 of the valve seat 2.

As shown in fig. 5, a limiting structure is further provided between the outer peripheral surface of the insert 32 and the recess 22, and the limiting structure is used for limiting the nut seat 3 and the valve seat 2 from rotating circumferentially.

In an embodiment, the limiting structure includes a first plane 321, the first plane 321 is disposed on an outer peripheral surface of the sidewall 325 of the nest 32, and the first plane 321 faces the sidewall of the recess 22 of the valve seat 2. The first plane 321 and the side wall of the recess 22 prevent the insert 32 and the valve seat 2 from rotating circumferentially.

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

In other embodiments, the spacing structure may also include a protrusion and a groove that mates with the protrusion. The protrusions may be provided on the outer circumferential surface of the nest 32 and the grooves may be provided on the side walls 2 of the recess 22.

The insert 32 is a metal piece formed by powder metallurgy die casting or an injection molded metal piece. As mentioned above, since the insert 32 has the second tooth slot structure 322 exposed outside, the insert 32 can be manufactured by one-step molding process such as die casting or injection molding, without cutting, which significantly improves the molding efficiency.

The screw 31 may be a plastic member and the nest 32 may be a metal member. The screw 31 and the nest 32 are formed by integral injection molding. The screw 31 is processed by the die, so that the screw quality can be ensured, the injection molding efficiency is high, and the screw quality stability is better.

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

It will be appreciated that in the case where the nest 32 has the second spline structure 322, when the screw 31 and the nest 32 are integrally injection molded, the plastic material fills the second spline structure 322 sufficiently, and the first spline structure 314 is formed on the outer periphery of the screw 31. Thus, the bonding area between the screw 31 and the nest 32 can be increased, and the bonding strength can be improved.

It will be appreciated that the various embodiments/implementations provided by the utility model may be combined with one another without conflict and are not illustrated here.

In the inventive embodiments, the terms "first," "second," "third," and the like 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 defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the embodiments of the utility model will be understood by those skilled in the art according to the specific circumstances.

In the description of the embodiments of the utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the utility model and to simplify the description, and do not indicate or imply that the devices or units referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the utility model.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular 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 utility model. In this specification, schematic representations of the above terms 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 is only a preferred embodiment of the utility model and is not intended to limit the embodiment of the utility model, and various modifications and variations can be made to the embodiment of the utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present utility model should be included in the protection scope of the embodiments of the present utility model.

Claims

1. A nut seat for an electronic expansion valve, the nut seat comprising:

the outer circumferential surface of the threaded piece is provided with a first tooth groove structure; and

the embedded part is sleeved on the periphery of the threaded part and is used for being connected with the valve seat of the electronic expansion valve; the inner peripheral surface of the nesting piece is provided with a second tooth groove structure, and the second tooth groove structure is matched with the first tooth groove structure.

2. The nut seat according to claim 1, characterized in that said nest comprises:

3. The nut seat as defined in claim 2, being characterized in that said side wall is provided with a notch extending through an inner wall surface and an outer wall surface of said side wall and through a top surface of said side wall facing away from said bottom wall;

4. A nut seat as defined in claim 3, being characterized in that said threaded member has at least one of said balance channels, said side wall has at least one of said notches, said number of notches being greater than or equal to said number of balance channels, one of said notches being disposed in correspondence with said balance channel.

5. The nut seat as defined in claim 2, being characterized in that a second stepped structure is formed at a junction of said bottom wall and said side wall, and an outer circumference of said screw has a first stepped structure fitted with said second stepped structure.

6. The nut seat as defined in claim 1, being characterized in that said screw comprises:

7. The nut seat as defined in claim 6, being characterized in that said screw further has a balance channel provided on said second guide section and penetrating an inner wall surface and an outer wall surface of said second guide section.

8. The nut seat according to claim 1, wherein said threaded member is a plastic member and said nested member is a metal member, said threaded member and said nested member being integrally injection molded.

9. The nut seat according to claim 1, characterized in that the insert is a metal piece molded by powder metallurgy die casting or an injection molded metal piece.

10. An electronic expansion valve comprising a nut seat according to any one of claims 1 to 9.