CN114183547A

CN114183547A - Electronic expansion valve

Info

Publication number: CN114183547A
Application number: CN202111456343.5A
Authority: CN
Inventors: 王冠军; 贺宇辰
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2022-03-15
Also published as: CN112901801B; JP2023501157A; WO2021098303A1; KR20220092613A; CN112901801A; JP7418564B2

Abstract

The invention provides an electronic expansion valve, comprising: a valve seat assembly having a valve cavity; the guide sleeve is arranged in the valve cavity and is connected with the valve seat assembly; the nut is arranged in the valve cavity and divides the valve cavity into a first cavity and a second cavity, a first channel communicated with the first cavity and the second cavity is formed between the outer wall of the nut and the inner wall of the valve cavity, at least one part of the nut is sleeved outside the guide sleeve, and a second channel communicated with the first cavity and the second cavity is formed between the inner wall of the nut and the outer wall of the guide sleeve; the valve core assembly is used for controlling the on-off state of the electronic expansion valve; a rotor assembly. The invention solves the problem of poor balancing effect of two cavities in the electronic expansion valve in the prior art.

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 usually forms two cavities in the electronic expansion valve, the normal work of the electronic expansion valve can be ensured only when the pressure in the two cavities needs to be balanced, the existing electronic expansion valve usually forms a gap between a nut and an outer valve seat or is provided with a channel, the design really has the function of balancing the two cavities, but the gap or the channel or an opening is usually small, so the balance effect is poor, the balance function can be exerted only when the gap or the channel or the opening needs to be aligned, the assembly requirement is high, and certain difficulty is caused in assembly.

Disclosure of Invention

The invention mainly aims to provide an electronic expansion valve to solve the problem that two cavities in the electronic expansion valve in the prior art are poor in balancing effect.

In order to achieve the above object, the present invention provides an electronic expansion valve comprising: a valve seat assembly having a valve cavity; the guide sleeve is arranged in the valve cavity and is connected with the valve seat assembly; the nut is arranged in the valve cavity and divides the valve cavity into a first cavity and a second cavity, a first channel communicated with the first cavity and the second cavity is formed between the outer wall of the nut and the inner wall of the valve cavity, at least one part of the nut is sleeved outside the guide sleeve, and a second channel communicated with the first cavity and the second cavity is formed between the inner wall of the nut and the outer wall of the guide sleeve; the valve core assembly is movably arranged on the nut and the guide sleeve in a penetrating way and matched with the nut; the rotor assembly is rotatably arranged relative to the valve seat assembly and connected with the valve core assembly, and the rotor assembly can drive the valve core assembly to synchronously rotate so as to change the on-off state of the electronic expansion valve.

Furthermore, the locating slot is formed in the side face of the guide sleeve, the locating slot is communicated with the end face of the guide sleeve, the locating rib is arranged on the inner side of the nut and extends into the locating slot, a first gap is formed between the locating rib and the locating slot, and the first gap serves as at least one part of the second channel.

Furthermore, the guide sleeve comprises a large-diameter section and a small-diameter section which are connected in sequence, one end, far away from the small-diameter section, of the large-diameter section is connected with the valve seat assembly, the nut is provided with a reducing section, a first expanding section and a second expanding section which are connected in sequence, the second expanding section is sleeved on the outer side of the large-diameter section, the first expanding section is sleeved on the outer side of the small-diameter section, the positioning groove penetrates through the large-diameter section and the small-diameter section along the axial direction of the guide sleeve, and the positioning rib is located on the end face of the first expanding section.

Further, a second gap is formed between the step surface between the reducing section and the first expanding section and the end surface of the small diameter section, and the second gap is communicated with the first gap and forms a second channel.

Further, the positioning rib is located in the second diameter expanding section, the outer wall of the second diameter expanding section is provided with a notch portion, the notch portion penetrates through the second diameter expanding section along the axial direction of the nut, and the notch portion serves as at least one part of the first channel.

Further, the nut is also provided with an avoiding notch for avoiding an external pipeline, the side surface of the guide sleeve is provided with a through hole communicated with the external pipeline, and when the positioning rib is positioned in the positioning groove, one part of the external pipeline is positioned in the avoiding notch.

Furthermore, the outer wall of the nut is provided with a notch portion, the electronic expansion valve further comprises a pressing plate, the pressing plate is connected with the inner wall of the valve cavity and tightly presses the nut on the valve seat assembly, a through hole communicated with the notch portion is formed in the outer edge of the pressing plate, and the notch portion and the through hole form a first channel.

Further, the through holes are one or more, and when the through holes are provided in plurality, each through hole is arranged along the circumferential direction of the pressure plate.

Furthermore, the outer wall of the nut is provided with a convex rib, the pressing plate is sleeved on the outer side of the nut, the inner wall of the pressing plate is provided with a groove, the convex rib is contained in the groove, and the pressing plate can not rotate relative to the nut.

Furthermore, protruding muscle and recess all are provided with a plurality ofly to set up along the circumference of clamp plate, and protruding muscle and recess one-to-one set up.

By applying the technical scheme of the invention, the first channel is formed between the nut and the valve seat assembly, the second channel is formed between the guide sleeve and the nut, and the first channel and the second channel are communicated with the first cavity and the second cavity, so that the balance capability of balancing the first cavity and the second cavity is improved by arranging the two channels, the balance effect is better, the first channel and the second channel are arranged at the edges of the nut and the guide sleeve, the design of a balance small hole is avoided, core pulling action is not needed, the design of a die is simplified, the efficiency is improved, and the cost is reduced.

Drawings

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

fig. 1 shows a front view of an electronic expansion valve of the present invention;

FIG. 2 shows an enlarged view at P in FIG. 1;

FIG. 3 shows a side view of the electronic expansion valve of FIG. 1;

FIG. 4 shows an enlarged view at Q of FIG. 3;

FIG. 5 is a schematic view showing a guide sleeve of the electronic expansion valve of FIG. 1;

fig. 6 is a schematic view illustrating a nut of the electronic expansion valve of fig. 1;

FIG. 7 is a schematic diagram showing another perspective of the nut of FIG. 6; and

fig. 8 is a schematic structural view of the electronic expansion valve of fig. 1 with the upper sleeve, the rotor assembly and the valve core assembly removed.

Wherein the figures include the following reference numerals:

10. a valve seat assembly; 11. a first cavity; 12. a second cavity; 20. a guide sleeve; 21. positioning a groove; 22. a large diameter section; 23. a small diameter section; 24. a through hole; 30. a nut; 31. positioning ribs; 32. a first diameter expanding section; 33. a reducing section; 34. a second diameter expanding section; 35. avoiding the notch; 36. a rib is protruded; 40. a first channel; 41. a notch portion; 42. a via hole; 50. a second channel; 51. a first gap; 52. a second gap; 60. a valve core assembly; 70. a rotor assembly; 80. pressing a plate; 81. a groove; 91. a first connecting pipe; 92. a second connecting pipe.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

The invention provides an electronic expansion valve, aiming at solving the problem that the balance effect of two cavities in the electronic expansion valve in the prior art is poor.

An electronic expansion valve as shown in fig. 1 to 8 comprises a valve seat assembly 10, a guide sleeve 20, a nut 30, a valve core assembly 60 and a rotor assembly 70 for controlling the on-off state of the electronic expansion valve, wherein the valve seat assembly 10 has a valve cavity; the guide sleeve 20 is arranged in the valve cavity and is connected with the valve seat assembly 10; the nut 30 is arranged in the valve cavity and divides the valve cavity into a first cavity 11 and a second cavity 12, a first channel 40 communicating the first cavity 11 and the second cavity 12 is formed between the outer wall of the nut 30 and the inner wall of the valve cavity, at least one part of the nut 30 is sleeved outside the guide sleeve 20, and a second channel 50 communicating the first cavity 11 and the second cavity 12 is formed between the inner wall of the nut 30 and the outer wall of the guide sleeve 20; the valve core component 60 is movably arranged on the nut 30 and the guide sleeve 20 in a penetrating way and is matched with the nut 30; the rotor assembly 70 is rotatably disposed relative to the valve seat assembly 10 and connected to the valve core assembly 60, and the rotor assembly 70 can drive the valve core assembly 60 to rotate synchronously to change the on-off state of the electronic expansion valve.

This embodiment is through being formed with first passageway 40 between nut 30 and valve seat subassembly 10, be formed with second passageway 50 between uide bushing 20 and the nut 30 simultaneously, first passageway 40 and second passageway 50 all communicate first cavity 11 and second cavity 12, as shown in fig. 1 to fig. 4, like this, the setting of two passageways has improved the balancing ability of balanced first cavity 11 and second cavity 12, balanced effect is better, and first passageway 40 all is in the edge of nut 30 and uide bushing 20 with second passageway 50, the design of balanced aperture has been avoided, need not do the action of loosing core, the mold design is simplified, high efficiency, and cost is reduced.

As shown in fig. 5 and 7, the positioning groove 21 is formed in the side surface of the guide sleeve 20, the positioning groove 21 is communicated with the end surface of the guide sleeve 20, the positioning rib 31 is disposed on the inner side of the nut 30, the positioning rib 31 extends into the positioning groove 21, a first gap 51 is formed between the positioning rib 31 and the positioning groove 21, and the first gap 51 serves as at least a part of the second channel 50. The positioning groove 21 is communicated with the end face of the guide sleeve 20, so that the nut 30 is sleeved outside the guide sleeve 20 along the axial direction of the guide sleeve 20 when the assembly of the components is considered, and the positioning rib 31 can smoothly enter the positioning groove 21. The setting of constant head tank 21 and location muscle 31 is as the structure basis that forms second passageway 50 on the one hand, just can form first clearance 51 naturally through the cooperation of big or small structure between constant head tank 21 and the location muscle 31, need not additionally set up, and on the other hand is convenient and fast when equipment uide bushing 20 and nut 30, guarantees the accuracy and the reliability of installation.

As shown in fig. 6 and 7, the guide sleeve 20 includes a large diameter section 22 and a small diameter section 23 which are connected in sequence, and one end of the large diameter section 22 far away from the small diameter section 23 is connected with the valve seat assembly 10, the nut 30 has a reducing section 33, a first expanding section 32 and a second expanding section 34 which are connected in sequence, the first expanding section 32 is sleeved outside the small diameter section 23, the second expanding section 34 only covers a partial section of the large diameter section 22, the positioning groove 21 is arranged on the large diameter section 22 and the small diameter section 23 in the axial direction of the guide sleeve 20, and the positioning rib 31 is positioned on the end face of the first expanding section 32. Thus, when the second expanded diameter section 34 of the nut 30 is fitted over the large diameter section 22 of the guide sleeve 20, the positioning rib 31 will simultaneously extend into the positioning groove 21, so that the nut 30 cannot rotate relative to the guide sleeve 20.

Because of the above-mentioned arrangement, a step surface is naturally formed between the reduced diameter section 33 and the first enlarged diameter section 32, and if the step surface is in close contact with the end surface of the small diameter section 23, the first cavity 11 and the second cavity 12 cannot be effectively communicated through the second passage 50, so that the step surface between the reduced diameter section 33 and the first enlarged diameter section 32 is arranged with a gap from the end surface of the small diameter section 23, a second gap 52 is formed therebetween, and the second gap 52 is communicated with the first gap 51, so that the first cavity 11 and the second cavity 12 are communicated through the first gap 51 and the second gap 52, and naturally, the second gap 52 is matched with the first gap 51 to serve as the second passage 50.

In the present embodiment, the positioning rib 31 is located in the second expanding section 34, the outer wall of the second expanding section 34 has a notch portion 41, the notch portion 41 forms a gap with the inner wall of the valve seat assembly 10, the notch portion 41 serves as at least a part of the first passage 40, and the notch portion 41 penetrates the second expanding section 34 in the axial direction of the nut 30, so that the first cavity 11 and the second cavity 12 communicate with each other through the notch portion 41.

Preferably, the nut 30 and the guide sleeve 20 are both resin injection-molded parts.

As shown in fig. 1, the valve seat assembly 10 is connected to an external pipeline, wherein the external pipeline includes a first connection pipe 91 connected to a side surface of the valve seat assembly 10 and a second connection pipe 92 connected to a bottom surface of the valve seat assembly 10, interference may occur between the first connection pipe 91 and the nut 30 because the first connection pipe 91 is at the side surface of the valve seat assembly 10, in order to avoid this, an avoiding notch 35 for avoiding the first connection pipe 91 is further provided at the side surface of the nut 30, the avoiding notch 35 is semicircular because the first connection pipe 91 is generally a circular pipe as shown in fig. 7 and is sleeved outside the first connection pipe 91, correspondingly, the guide sleeve 20 is provided at a side surface thereof with a through hole 24, the through hole 24 is communicated with a central hole at an axial line of the guide sleeve 20, and the through hole 24 is also aligned with the first connection pipe 91, and positions of the first connection pipe 91, the avoiding notch 35 and the through hole 24 need to be arranged in the above directions to achieve a valve function of the electronic expansion valve, therefore, when the guide sleeve 20 is installed on the valve seat assembly 10, the circumferential position of the guide sleeve 20 needs to be adjusted, so that the through hole 24 aligns with the first connecting pipe 91, and the position of the avoiding notch 35 and the first connecting pipe 91 is realized by the cooperation between the positioning groove 21 and the positioning rib 31, that is, when the positioning rib 31 is located in the positioning groove 21, the avoiding notch 35 aligns with the first connecting pipe 91, a part of the first connecting pipe 91 is located in the avoiding notch 35, and thus the position-oriented accurate assembly of the first connecting pipe 91, the avoiding notch 35 and the through hole 24 is realized.

In this embodiment, the electronic expansion valve further includes a pressure plate 80, the pressure plate 80 is connected to an inner wall of the valve cavity and presses the nut 30 against the valve seat assembly 10, so that the nut 30 can be fixed on the valve seat assembly 10 through the pressure plate 80, a through hole 42 aligned and communicated with the notch portion 41 is formed at an outer edge of the pressure plate 80, the notch portion 41 and the through hole 42 together form the first channel 40, and thus the first cavity 11 and the second cavity 12 are communicated through the notch portion 41 and the through hole 42 on the pressure plate 80.

Optionally, the notched portion 41 and the via hole 42 may be one, or may be provided with a plurality of through holes, in this embodiment, it is preferable that the notched portion 41 and the via hole 42 are both provided with a plurality of and are arranged in a one-to-one correspondence, and the notched portion 41 and the via hole 42 are arranged along the circumferential direction of the pressing plate 80, so that a plurality of first channels 40 are formed, and the communication effect between the first cavity 11 and the second cavity 12 is improved.

As shown in fig. 6 and 8, in order to avoid the situation that the notch portion 41 is not aligned with the via hole 42 due to the rotation of the pressing plate 80 sleeved outside the nut 30 relative to the nut 30, the outer wall of the nut 30 is provided with the protruding rib 36 in the embodiment, the inner wall of the pressing plate 80 is provided with the groove 81, the protruding rib 36 is accommodated in the groove 81, the pressing plate 80 cannot rotate relative to the nut 30 through the cooperation of the protruding rib 36 and the groove 81, and it is ensured that the via hole 42 is always aligned with the notch portion 41 when the pressing plate 80 is mounted on the nut 30, and the balance effect of the first channel 40 is also ensured.

Optionally, the plurality of ribs 36 and the plurality of grooves 81 are arranged uniformly along the circumferential direction of the pressing plate 80, and the ribs 36 and the grooves 81 are arranged in a one-to-one correspondence manner, so as to ensure the stress balance between the pressing plate 80 and the nut 30.

In this embodiment, the valve seat assembly 10 includes a lower valve seat, an upper sleeve and a valve seat core, wherein the lower valve seat and the upper sleeve are butted together to form a valve cavity, other components are all accommodated in the valve cavity, the side surface and the bottom surface of the lower valve seat are provided with communication holes 24 for communicating with the first connection pipe 91 and the second connection pipe 92, a valve seat is installed at a communication port on the bottom surface, the valve seat is in a sleeve shape, fluid entering from the second connection pipe 92 sequentially passes through the valve seat and the guide sleeve 20 to enter the valve cavity, and flows out from the valve cavity through the first connection pipe 91, and the opening and closing of the electronic expansion valve is realized through the cooperation between the valve core assembly 60 and the valve core seat, specifically, one end of the valve core assembly 60 can extend into or withdraw from the valve core seat, so as to change the opening degree of the valve port on the valve core seat to realize the flow regulation.

The case subassembly 60 of this embodiment includes the screw rod, needle and spring, wherein, screw rod and nut 30 screw-thread fit, and be connected with rotor subassembly 70, rotor subassembly 70 rotates under the drive of outside magnetic force, the axial displacement of case subassembly 60 is realized through the screw rod and the screw-thread fit between the nut 30, thereby change the distance between case subassembly 60 and the case seat, realize adjusting, the needle is worn to establish in the screw rod and the cooperation is adjusted between the one end of needle and the case seat, the spring is located the screw rod, and the cover is established in the needle outside, the both ends of spring respectively with screw rod and needle butt, thereby guarantee screw rod and needle simultaneous movement.

It should be noted that, a plurality in the above embodiments means at least two.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

1. the problem of poor balancing effect of two cavities in the electronic expansion valve in the prior art is solved;

2. the first channel and the second channel improve the balance capability of balancing the first cavity and the second cavity, and the balance effect is better;

3. the first channel and the second channel are arranged at the edges of the nut and the guide sleeve, so that a small balance hole is avoided, core pulling is not needed, the design of a die is simplified, the efficiency is improved, and the cost is reduced;

4. the positioning ribs and the positioning grooves have a directional effect on the assembly of the nut and the guide sleeve while realizing the second channel, and the accuracy and the reliability of installation are ensured.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

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

Claims

1. An electronic expansion valve, comprising:

a valve seat assembly (10), the valve seat assembly (10) having a valve cavity;

the guide sleeve (20) is arranged in the valve cavity and is connected with the valve seat assembly (10);

the nut (30) is arranged in the valve cavity and divides the valve cavity into a first cavity body (11) and a second cavity body (12), a first passage (40) communicating the first cavity body (11) with the second cavity body (12) is formed between the outer wall of the nut (30) and the inner wall of the valve cavity, at least one part of the nut (30) is sleeved on the outer side of the guide sleeve (20), and a second passage (50) communicating the first cavity body (11) with the second cavity body (12) is formed between the inner wall of the nut (30) and the outer wall of the guide sleeve (20);

the valve core assembly (60) is used for controlling the on-off state of the electronic expansion valve, and the valve core assembly (60) is movably arranged on the nut (30) and the guide sleeve (20) in a penetrating manner and is matched with the nut (30);

the rotor assembly (70) is rotatably arranged relative to the valve seat assembly (10) and is connected with the valve core assembly (60), and the rotor assembly (70) can drive the valve core assembly (60) to synchronously rotate so as to change the on-off state of the electronic expansion valve;

the outer wall of nut (30) has breach portion (41), electronic expansion valve still includes clamp plate (80), clamp plate (80) with the inner wall of valve pocket is connected, and will nut (30) compress tightly on valve seat subassembly (10), the outer fringe of clamp plate (80) seted up with via hole (42) of breach portion (41) intercommunication, breach portion (41) with via hole (42) form first passageway (40).

2. An electronic expansion valve according to claim 1, wherein a positioning groove (21) is formed in a side surface of the guide sleeve (20), the positioning groove (21) is communicated with an end surface of the guide sleeve (20), a positioning rib (31) is provided on an inner side of the nut (30), the nut (30) is sleeved on an outer side of the guide sleeve (20) along an axial direction of the guide sleeve (20), the positioning rib (31) extends into the positioning groove (21), a first gap (51) is formed between the positioning rib (31) and the positioning groove (21), and the first gap (51) serves as at least a part of the second channel (50).

3. An electronic expansion valve according to claim 2, wherein the guide sleeve (20) comprises a large diameter section (22) and a small diameter section (23) which are connected in sequence, and one end of the large diameter section (22) far away from the small diameter section (23) is connected with the valve seat assembly (10), the nut (30) has a reducing diameter section (33), a first expanding diameter section (32) and a second expanding diameter section (34) which are connected in sequence, the second expanding diameter section (34) is sleeved outside the large diameter section (22), the first expanding diameter section (32) is sleeved outside the small diameter section (23), the positioning groove (21) is arranged on the large diameter section (22) and the small diameter section (23) in the axial direction of the guide sleeve (20), and the positioning rib (31) is located on the end face of the first expanding diameter section (32).

4. An electronic expansion valve according to claim 3, wherein a second gap (52) is formed between a step surface between the reduced diameter section (33) and the first expanded diameter section (32) and an end surface of the small diameter section (23), the second gap (52) communicating with the first gap (51) and forming the second passage (50).

5. An electronic expansion valve according to claim 3, wherein the positioning rib (31) is located inside the second expanded diameter section (34), and an outer wall of the second expanded diameter section (34) has the cutout portion (41), and the cutout portion (41) penetrates the second expanded diameter section (34) in an axial direction of the nut (30).

6. An electronic expansion valve according to claim 2, wherein the nut (30) further has an avoidance gap (35) for avoiding an external pipe, and the guide sleeve (20) has a through hole (24) at a side thereof communicating with the external pipe, and a part of the external pipe is located in the avoidance gap (35) when the positioning rib (31) is located in the positioning groove (21).

7. The electronic expansion valve according to claim 1, wherein the through-hole (42) is one or more, and when the through-hole (42) is provided in plurality, each through-hole (42) is provided along a circumferential direction of the pressure plate (80).

8. An electronic expansion valve according to claim 1, wherein the outer wall of the nut (30) has a rib (36), the pressure plate (80) is fitted over the outer side of the nut (30), and the inner wall of the pressure plate (80) has a groove (81), the rib (36) is received in the groove (81) and prevents the pressure plate (80) from rotating relative to the nut (30).

9. An electronic expansion valve according to claim 8, wherein a plurality of ribs (36) and grooves (81) are provided, and are arranged along the circumferential direction of the pressure plate (80), and the ribs (36) and the grooves (81) are arranged in one-to-one correspondence.