CN111059296B

CN111059296B - Electronic expansion valve

Info

Publication number: CN111059296B
Application number: CN201811210216.5A
Authority: CN
Inventors: 裴俊峰; 贺宇辰; 龙江军
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2018-10-17
Filing date: 2018-10-17
Publication date: 2022-02-08
Anticipated expiration: 2038-10-17
Also published as: CN111059296A

Abstract

The invention provides an electronic expansion valve, comprising: a valve body; the rotor is arranged in the valve body; the nut component is rotatably arranged in the valve body, and the rotor is in driving connection with the nut component; the screw rod penetrates through the nut component and is in threaded connection with the nut component; the valve needle assembly is arranged in the valve body and is connected with the screw rod; the first rotation stopping structure is arranged between the screw rod and the valve body and used for limiting the rotation of the screw rod. Through the technical scheme provided by the application, the problems that the service life of the electronic expansion valve is short and leakage is easy to occur after failure in the prior art can be solved.

Description

Electronic expansion valve

Technical Field

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

Background

As shown in fig. 1, the presently available electronic expansion valve includes a sleeve 1, a rotor 2, a screw 3, a nut member 4, a needle member 5, and a valve seat 6. The screw rod 3 is in threaded connection with the nut component 4, the screw rod 3 penetrates through the nut component 4, the rotor 2 is sleeved on the nut component 4 and is fixedly connected with the screw rod 3, the rotor 2 can drive the screw rod 3 to lift under the power-on state of the external coil, the lower end of the screw rod 3 is connected with the valve needle component 5, and the valve needle component 5 is driven to lift through the lifting of the screw rod 3 so as to control the flow of fluid. Valve needle part 5 includes valve needle, valve needle seat and pretension spring, and the one end of wearing to establish at valve needle seat is worn to the one end of screw rod 3, and the other end at valve needle seat is worn to establish by the valve needle, and the pretension spring setting is in valve needle seat, and is located between screw rod 3 and the valve needle, and the pretension spring has the pretightning force in valve needle seat to guarantee the valve needle under the valve body closure state with the valve port butt.

In the existing design, because the pre-tightening spring is in a pre-tightening state, the pre-tightening spring, the screw rod 3 and the valve needle have friction force. Rotor 2 can make pretension spring, needle rotate together at the rotation in-process, can cause wearing and tearing to the valve port like this, and then leads to valve body life short, easily appears revealing after becoming invalid.

Disclosure of Invention

The invention provides an electronic expansion valve, which aims to solve the problems that the electronic expansion valve in the prior art is short in service life and easy to leak after failure.

The invention provides an electronic expansion valve, which comprises: a valve body; the rotor is arranged in the valve body; the nut component is rotatably arranged in the valve body, and the rotor is in driving connection with the nut component; the screw rod penetrates through the nut component and is in threaded connection with the nut component; the valve needle assembly is arranged in the valve body and is connected with the screw rod; the first rotation stopping structure is arranged between the screw rod and the valve body and used for limiting the rotation of the screw rod.

Furthermore, the screw rod has a first end and a second end which are arranged oppositely, the first end of the screw rod is located in the nut component and is in threaded connection with the nut component, the second end of the screw rod is provided with a boss which is located on the outer side wall of the screw rod, the valve body is provided with a first limiting groove, the boss is movably arranged in the first limiting groove, and the boss is matched with the first limiting groove to limit the rotation of the screw rod.

Further, the second end of the screw has a receiving bore, and the needle assembly includes: the valve needle is movably arranged in the accommodating hole, and one end of the valve needle is positioned outside the screw; the first pre-tightening spring is arranged in the accommodating hole, one end of the first pre-tightening spring is abutted to the valve needle, and the other end of the first pre-tightening spring is abutted to the screw rod.

Further, the electronic expansion valve further includes: and the second pre-tightening spring is arranged between the valve body and the screw rod and is used for applying axial pressure to the screw rod.

Further, the nut part has a through-hole, and the through-hole has relative first end and the second end that sets up, and the second end of through-hole sets up to the screw thread section, screw rod and screw thread section threaded connection, and electronic expansion valve still includes: the limiting seat is arranged at the first end of the through hole and provided with a guide post, the guide post is positioned in the through hole, and the outer wall of the guide post is provided with a spiral guide rail structure; the rotating part is rotatably arranged on the spiral guide rail structure, a limiting structure is arranged between the nut component and the rotating part, the limiting structure is used for enabling the nut component and the rotating part to synchronously rotate, and the rotating part can move along the axial direction relative to the nut component.

Furthermore, a second limiting groove is further formed in the through hole of the nut component, the second limiting groove extends in the axial direction, an extending end is arranged on the rotating portion and located in the second limiting groove, the extending end can move along the second limiting groove, and the extending end is matched with the second limiting groove to limit the rotating portion and the nut component to rotate relatively.

Furthermore, the rotating part comprises a stop ring, the stop ring is provided with two extending ends, the extending directions of the two extending ends are different, two second limiting grooves are arranged in the through hole of the nut component, and the two second limiting grooves and the two extending ends are arranged in a one-to-one correspondence mode.

Further, the valve body includes: a sleeve; the valve seat is provided with a valve core and a mounting hole communicated with the valve core, an accommodating space is formed between the inside of the sleeve and the mounting hole, the rotor, the nut component, the screw rod, the valve needle component, the limiting seat and the first rotation stopping structure are arranged in the accommodating space, the inner wall of the mounting hole is provided with a first limiting groove, and the second end of the screw rod is movably arranged in the mounting hole.

Further, the valve body still includes: the seal cover is fixedly arranged at one end, far away from the valve seat, of the sleeve, a second rotation stopping structure is arranged between the seal cover and the limiting seat, and the second rotation stopping structure is used for limiting the limiting seat to rotate.

Further, the electronic expansion valve further includes: and a bearing disposed between the nut member and the valve body.

By applying the technical scheme of the invention, in the electronic expansion valve, the nut component is rotatably arranged in the valve body, the rotor is in driving connection with the nut component, the screw rod is in threaded connection with the nut component, and the first rotation stopping structure is arranged between the screw rod and the valve body. The rotor drives the nut component to rotate, and the nut component is in threaded connection with the screw rod, and the first rotation stopping structure limits the rotation of the screw rod, so that the screw rod can move along the axial direction. In the structure, the first rotation stopping structure is arranged to limit the rotation of the screw rod, so that the valve needle assembly can only move along the axial direction, the valve needle assembly is prevented from rotating to wear a valve port, the quality of the valve body is improved, and the service life of the valve body is prolonged.

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 is a schematic diagram of an electronic expansion valve provided by a prior art design;

fig. 2 is a schematic structural diagram of an electronic expansion valve provided according to an embodiment of the present invention;

FIG. 3 shows a cross-sectional view of the valve seat of FIG. 2;

FIG. 4 shows a schematic structural view of the nut member of FIG. 2;

FIG. 5 shows a cross-sectional view of the nut member of FIG. 4;

FIG. 6 shows a schematic view of the screw of FIG. 2;

fig. 7 shows a schematic structural view of the spacing block in fig. 2.

Wherein the figures include the following reference numerals:

1. a sleeve; 2. a rotor; 3. a screw; 4. a nut member; 5. a valve needle component; 6. a valve seat;

10. a valve body; 11. a first limit groove; 12. a sleeve; 13. a valve seat; 13a, a valve core; 13b, mounting holes; 14. sealing the cover; 20. a rotor; 30. a nut member; 31. a through hole; 32. a second limit groove; 40. a screw; 41. a boss; 42. an accommodation hole; 51. a valve needle; 52. a first pre-tightening spring; 60. a second pre-tightening spring; 70. a limiting seat; 71. a helical track structure; 80. a rotating part; 81. an extended end.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.

As shown in fig. 2, an embodiment of the present invention provides an electronic expansion valve, including: the valve comprises a valve body 10, a rotor 20, a nut component 30, a screw rod 40, a valve needle assembly and a first rotation stopping structure. Wherein, the rotor 20 is arranged in the valve body 10, the nut component 30 is rotatably arranged in the valve body 10, and the rotor 20 is connected with the nut component 30 in a driving way. The screw 40 is inserted into the nut member 30, and the screw 40 is screwed to the nut member 30. The needle assembly is disposed within the valve body 10 and is connected to the screw 40. The first rotation stopping structure is disposed between the screw 40 and the valve body 10, and the first rotation stopping structure is used for limiting the rotation of the screw 40. In this embodiment, the rotor 20 is a magnet structure, and a coil is further disposed outside the valve body 10, and the coil can drive the rotor 20 to rotate when the coil is in a power-on state, and the nut member 30 is driven to rotate by the rotor 20. The screw rod 40 is in threaded connection with the nut component 30, and the rotation of the screw rod 40 is limited through the first rotation stopping structure, so that the nut component 30 can drive the screw rod 40 to move up and down when rotating, and further can drive the valve needle component to move up and down.

The nut member 30 and the rotor 20 may be integrally formed, or may be connected by bonding or fastening.

In the structure, the first rotation stopping structure is arranged to limit the rotation of the screw rod 40, so that the valve needle assembly can only move along the axial direction, the valve needle assembly is prevented from rotating to wear a valve port, the quality of the valve body is improved, and the service life of the valve body is prolonged.

As shown in fig. 2 and 6, in particular, the screw rod 40 has a first end and a second end which are oppositely arranged, the first end of the screw rod 40 is positioned in the nut member 30 and is in threaded connection with the nut member 30, the second end of the screw rod 40 is provided with a boss 41, and the boss 41 is positioned on the outer side wall of the screw rod 40. Correspondingly, the valve body 10 is provided with a first limiting groove 11, the boss 41 is movably arranged in the first limiting groove 11, and the boss 41 is matched with the first limiting groove 11 to limit the rotation of the screw 40.

Specifically, the second end of the screw 40 is provided with two bosses 41, and the two bosses 41 are respectively located at two sides of the second end of the screw 40. Correspondingly, the valve body 10 is provided with two first limiting grooves 11, the two bosses 41 and the two first limiting grooves 11 are arranged in a one-to-one correspondence manner, the rotation of the screw 40 can be limited by the cooperation of the bosses 41 and the first limiting grooves 11, and the screw 40 can move along the first limiting grooves 11.

In this embodiment, the second end of the screw 40 has a receiving bore 42, and the needle assembly includes a needle 51 and a first pre-loaded spring 52. Wherein the valve needle 51 is movably arranged in the receiving hole 42, and one end of the valve needle 51 is located outside the screw 40. The first biasing spring 52 is disposed in the accommodation hole 42, and one end of the first biasing spring 52 abuts against the needle 51 and the other end of the first biasing spring 52 abuts against the screw 40. By providing the receiving hole 42 in the screw 40, the valve needle 51 and the first biasing spring 52 can be disposed in the receiving hole 42, which can improve the integration of the device and reduce the occupied space of the device. A preload force can be provided to the valve needle 51 by the first preload spring 52 to better engage the valve needle 51 with the valve port.

The electronic expansion valve further comprises a second pre-tightening spring 60, the second pre-tightening spring 60 is arranged between the valve body 10 and the screw rod 40, and the second pre-tightening spring 60 is used for applying axial pressure to the screw rod 40 so that threads on the screw rod 40 are tightly attached to threads on the nut component 30, relative shaking of the screw rod 40 and the nut component 30 is avoided, and stability of the device is improved. Also, noise generated by thread collision during mutual movement of the nut member 30 and the screw 40 can be avoided. Specifically, the second pre-tightening spring 60 is disposed between the stopper 70 and the screw 40.

As shown in fig. 4, 5 and 7, the nut member 30 has a through hole 31, the through hole 31 has a first end and a second end which are oppositely arranged, the second end of the through hole 31 is provided as a threaded section, the screw 40 is in threaded connection with the threaded section, and the electronic expansion valve further includes a limit seat 70 and a rotating part 80. Specifically, the limiting seat 70 is disposed at a first end of the through hole 31, the limiting seat 70 has a guide post, the guide post is located in the through hole 31, and a spiral guide structure 71 is disposed on an outer wall of the guide post. The rotating portion 80 is rotatably provided on the screw rail structure 71, and a limit structure is provided between the nut member 30 and the rotating portion 80, the limit structure is used for enabling the nut member 30 and the rotating portion 80 to rotate synchronously, and the rotating portion 80 can move along the axial direction relative to the nut member 30. In the above structure, the rotation portion 80 rotates in synchronization with the nut member 30, and the rotation portion 80 can rotate along the spiral guide structure 71, and the rotation portion 80 moves in the axial direction while rotating with respect to the spiral guide structure 71 due to the structural characteristics of the spiral guide structure 71, and when the rotation portion 80 rotates to the upper end or the lower end of the spiral guide structure 71, the rotation is stopped due to the structural limitation, and the nut member 30 is stopped to rotate, by which the limit displacement of the needle can be limited.

As shown in fig. 4 and 5, the through hole 31 of the nut member 30 is further provided with a second limiting groove 32, the second limiting groove 32 extends along the axial direction, the rotating portion 80 is provided with an extending end 81, the extending end 81 is located in the second limiting groove 32, the extending end 81 can move along the second limiting groove 32, and the extending end 81 and the second limiting groove 32 cooperate to limit the relative rotation between the rotating portion 80 and the nut member 30.

Specifically, the rotating portion 80 includes a stop ring, the stop ring has two extending ends 81, the extending directions of the two extending ends 81 are different, two second limiting grooves 32 are provided in the through hole 31 of the nut member 30, and the two second limiting grooves 32 and the two extending ends 81 are arranged in a one-to-one correspondence manner, so that the structural stability can be improved.

As shown in fig. 2 and 3, the valve body 10 includes a sleeve 12 and a valve seat 13, the valve seat 13 has a valve core 13a and a mounting hole 13b communicated with the valve core 13a, an accommodating space is formed between the inside of the sleeve 12 and the mounting hole 13b, and the rotor 20, the nut member 30, the screw 40, the needle assembly, the stopper seat 70 and the first rotation stopping structure are disposed in the accommodating space. Specifically, the inner wall of the mounting hole 13b is provided with a first limiting groove 11, and the second end of the screw 40 is movably disposed in the mounting hole 13 b. The valve needle 51 of the valve needle assembly is correspondingly arranged at the valve core 13 a. In the present embodiment, the stopper seat 70 is wrapped in the sleeve 12, the rotating portion 80 is located between the nut member 30 and the stopper seat 70, and the material of the stopper seat 70 and the material of the rotating portion 80 are different from the material of the sleeve 12 and the material of the valve seat 13, so that the noise generated during the movement of the rotating portion 80 can be blocked.

The valve body 10 further includes a sealing cover 14, the sealing cover 14 is fixedly disposed at an end of the sleeve 12 far away from the valve seat 13, and a second rotation stopping structure is disposed between the sealing cover 14 and the limiting seat 70, and the second rotation stopping structure is used for limiting rotation of the limiting seat 70. Specifically, a limiting groove is formed in the sealing cover 14, a boss is arranged on the side edge of the limiting seat 70, the boss is arranged in the limiting groove of the sealing cover 14, and the rotation of the limiting seat 70 is limited through the cooperation of the boss and the limiting groove.

Specifically, an annular boss is provided on the cover 14, an end of the valve seat 13 facing the nut member 30 is also provided with an annular boss, and both ends of the nut member 30 are respectively located in the two annular bosses to restrict the nut member 30 from moving radially by this structure.

In the present embodiment, the electronic expansion valve further includes a bearing disposed between the nut member 30 and the valve body 10. Specifically, bearings may be provided at both ends of the nut member 30, respectively, to also ensure the normal rotation of the nut member 30. Of course, the normal rotation of the nut member 30 may be ensured by providing lubricating oil between the nut member 30 and the valve body 10 without providing a bearing.

Through the electronic expansion valve that this embodiment provided, can avoid screw rod and needle at the valve body internal rotation to avoid the condition emergence that valve port wearing and tearing and the fluid that brings from this revealed, extension device life-span. And the second pre-tightening spring is arranged in the valve body, so that the screw rod can be tightly attached to the nut component, the screw rod is prevented from shaking, and the overall stability of the device is improved.

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 forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

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 body (10);

a rotor (20) disposed within the valve body (10);

a nut member (30) rotatably disposed within the valve body (10), the rotor (20) being drivingly connected to the nut member (30);

the screw rod (40) is arranged on the nut component (30) in a penetrating mode, and the screw rod (40) is in threaded connection with the nut component (30);

the valve needle assembly is arranged in the valve body (10) and is connected with the screw rod (40);

the first rotation stopping structure is arranged between the screw rod (40) and the valve body (10) and is used for limiting the rotation of the screw rod (40);

the nut member (30) has a through hole (31), the through hole (31) has a first end and a second end which are oppositely arranged, the second end of the through hole (31) is arranged as a threaded section, the screw rod (40) is in threaded connection with the threaded section, and the electronic expansion valve further comprises:

the limiting seat (70) is arranged at the first end of the through hole (31), the limiting seat (70) is provided with a guide post, the guide post is positioned in the through hole (31), and the outer wall of the guide post is provided with a spiral guide rail structure (71);

and a rotating part (80) which is rotatably arranged on the spiral guide rail structure (71), wherein a limiting structure is arranged between the nut member (30) and the rotating part (80), the limiting structure is used for enabling the nut member (30) and the rotating part (80) to rotate synchronously, and the rotating part (80) can move along the axial direction relative to the nut member (30).

2. An electronic expansion valve according to claim 1, wherein the screw rod (40) has a first end and a second end which are oppositely arranged, the first end of the screw rod (40) is located in the nut member (30) and is in threaded connection with the nut member (30), the second end of the screw rod (40) is provided with a boss (41), the boss (41) is located on the outer side wall of the screw rod (40), the valve body (10) is provided with a first limiting groove (11), the boss (41) is movably arranged in the first limiting groove (11), and the boss (41) is matched with the first limiting groove (11) to limit the rotation of the screw rod (40).

3. An electronic expansion valve according to claim 2, wherein the second end of the screw (40) has a receiving bore (42), and the valve needle assembly comprises:

a valve needle (51) movably disposed in the accommodation hole (42), one end of the valve needle (51) being located outside the screw (40);

and a first pre-tightening spring (52) arranged in the accommodating hole (42), wherein one end of the first pre-tightening spring (52) abuts against the valve needle (51), and the other end of the first pre-tightening spring (52) abuts against the screw (40).

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

and the second pre-tightening spring (60) is arranged between the valve body (10) and the screw rod (40), and the second pre-tightening spring (60) is used for applying axial pressure to the screw rod (40).

5. An electronic expansion valve according to claim 1, wherein a second limiting groove (32) is further provided in the through hole (31) of the nut member (30), the second limiting groove (32) extends in the axial direction, the rotating portion (80) has an extending end (81), the extending end (81) is located in the second limiting groove (32), the extending end (81) is movable along the second limiting groove (32), and the extending end (81) cooperates with the second limiting groove (32) to limit the relative rotation between the rotating portion (80) and the nut member (30).

6. An electronic expansion valve according to claim 5, wherein the rotating part (80) comprises a stop collar having two extending ends (81), and the extending directions of the two extending ends (81) are different, and two second limiting grooves (32) are provided in the through hole (31) of the nut member (30), and the two second limiting grooves (32) are provided in one-to-one correspondence with the two extending ends (81).

7. An electronic expansion valve according to claim 2, wherein the valve body (10) comprises:

a sleeve (12);

the valve seat (13) is provided with a valve core (13a) and a mounting hole (13b) communicated with the valve core (13a), an accommodating space is formed between the interior of the sleeve (12) and the mounting hole (13b), the rotor (20), the nut component (30), the screw rod (40), the valve needle component, the limiting seat (70) and the first rotation stopping structure are all arranged in the accommodating space, the first limiting groove (11) is formed in the inner wall of the mounting hole (13b), and the second end of the screw rod (40) is movably arranged in the mounting hole (13 b).

8. An electronic expansion valve according to claim 7, wherein the valve body (10) further comprises:

the sealing cover (14) is fixedly arranged at one end, far away from the valve seat (13), of the sleeve (12), and a second rotation stopping structure is arranged between the sealing cover (14) and the limiting seat (70) and used for limiting the rotation of the limiting seat (70).

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

a bearing provided between the nut member (30) and the valve body (10).