CN211261369U

CN211261369U - Electronic expansion valve

Info

Publication number: CN211261369U
Application number: CN201921485851.4U
Authority: CN
Inventors: 朱延鑫; 刘敬喜
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-08-14
Anticipated expiration: 2029-09-06

Abstract

The utility model provides an electronic expansion valve, electronic expansion valve includes: a movable valve member, at least a portion of which is disposed within a space defined by a diversion chamber assembly, the diversion chamber assembly including a fluid port, the movable valve member for closing and opening the fluid port; and an actuator for driving the movable valve member to perform an axial movement while performing a rotational movement, wherein the electronic expansion valve further comprises a stopper mechanism including a movable stopper provided on the movable valve member and moving along with the movable valve member, and a stationary stopper provided on the guide chamber assembly and configured to be capable of abutting against the movable stopper, thereby limiting a range of the axial movement of the movable valve member. According to the utility model discloses an electronic expansion valve can effectively avoid the vice card dead condition of screw thread to the part figure is less and simple structure, easily manufacturing, has higher cost-effectiveness.

Description

Electronic expansion valve

Technical Field

The utility model relates to an electronic expansion valve.

Background

This section provides background information related to the present invention, which does not necessarily constitute prior art.

Electronic expansion valves are important components in cooling/heating systems, primarily for regulating the flow of refrigerant fluid. Conventional electronic expansion valves are generally controlled by a stepping motor, and are generally composed of a driving mechanism (stepping motor), an actuator (threaded screw mechanism), a throttling mechanism (valve needle and valve seat), and related auxiliary mechanisms.

Due to the use of a threaded screw mechanism for transmission, during the up and down movement of the valve needle, for example, in the fully open and fully closed positions of the valve (fluid outlet), the problem of thread pair seizing due to excessive rotation of the rotor may occur, making it difficult to ensure smooth transmission of the thread pair.

Therefore, there is a need to provide an improved electronic expansion valve which can solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The general outline of the present invention is provided in this section, not a full scope of the invention or a full disclosure of all the features of the invention.

The object of the present invention is to improve upon one or more of the above mentioned technical problems.

According to an aspect of the utility model, a provide an electronic expansion valve, electronic expansion valve includes:

a movable valve member, at least a portion of which is disposed within a space defined by a diversion chamber assembly, the diversion chamber assembly including a fluid port, the movable valve member for closing and opening the fluid port; and

an actuator for driving the movable valve member to perform axial movement while performing rotational movement,

wherein, the electronic expansion valve also comprises a stop mechanism, the stop mechanism comprises a movable stop part and a static stop part,

wherein the movable stop member is disposed on the movable valve member and moves with the movable valve member, and the stationary stop member is disposed on the diversion chamber assembly and is configured to be able to abut against the movable stop member, thereby limiting the range of axial movement of the movable valve member.

According to a preferred embodiment of the present invention, the stopping mechanism comprises one of the movable stopping member and two of the static stopping members, and the stopping mechanism is configured to make one of the movable stopping member and two of the static stopping members respectively abut against each other: the movable valve member closes the fluid port when the movable stop abuts a first of the two stationary stops; the distance of the movable valve member from the fluid port reaches a maximum when the movable stop abuts a second of the two stationary stops.

According to a preferred embodiment of the present invention, the diversion chamber assembly comprises a guide sleeve configured to be clearance-fitted with the movable valve member and to guide the axial movement of the movable valve member, and two only one of the stationary position members is provided on the guide sleeve.

According to a preferred embodiment of the present invention, the other of the two stationary seats is provided on a valve seat of the diversion chamber assembly defining the fluid port or a housing portion of the diversion chamber assembly.

According to a preferred embodiment of the present invention, the stopping mechanism comprises two movable stopping members and two stationary stopping members, the stopping mechanism is configured to make two movable stopping members respectively abut against two stationary stopping members: said movable valve member closing said fluid port when a first of said two said movable stops abuts a first of said two stationary stops; when the second of the two stop members abuts the second of the two stationary members, the distance between the movable valve member and the fluid port reaches a maximum value.

According to a preferred embodiment of the present invention, the guide chamber assembly comprises a guide sleeve configured to be clearance-fitted with the movable valve member and guide the axial movement of the movable valve member, and two the stationary position members are all provided on the guide sleeve.

According to a preferred embodiment of the present invention, the movable stop member and the stationary stop member are configured to be capable of abutting each other in a circumferential direction of the rotational movement of the movable valve member.

According to a preferred embodiment of the present invention, the movable stop member is fixed to the movable valve member by means of welding, bonding, clamping, or plugging, and the stationary stop member is fixed to the diversion cavity assembly by means of welding, bonding, clamping, or plugging.

According to a preferred embodiment of the present invention, the diversion chamber assembly comprises a valve seat in which the fluid port is provided, one end of the movable valve member being adapted to engage with the valve seat to close the fluid port, and the actuator comprises a spindle fixedly connected to the movable valve member and driving the movable valve member to perform an axial movement while performing a rotational movement.

According to a preferred embodiment of the present invention, the movable valve member is of an integral structure.

According to a preferred embodiment of the present invention, the movable stop member has a stop plane, and when the movable stop member abuts against the stationary stop member, the stop plane of the movable stop member contacts with the stationary stop member.

To sum up, according to the utility model discloses an electronic expansion valve brings following beneficial technological effect at least: according to the utility model discloses an electronic expansion valve is through adopting as above the position mechanism of ending and can accurately inject screw thread drive mechanism's axial stroke scope to effectively avoid the vice card dead condition of screw thread, and according to the utility model discloses an electronic expansion valve's part figure is less and simple structure, easily manufacturing, has higher cost-effectiveness.

Drawings

The foregoing and additional features and characteristics of the present invention will become more apparent from the following detailed description, taken with reference to the accompanying drawings, which are given by way of example only and which are not necessarily drawn to scale. Like reference numerals are used to indicate like parts in the accompanying drawings, in which:

fig. 1 shows a longitudinal cross-sectional view of an electronic expansion valve according to a first preferred embodiment of the present invention;

FIGS. 2a and 2b illustrate two detent states of the detent mechanism of FIG. 1, wherein FIG. 2a illustrates the detent state with the fluid outlet closed and FIG. 2b illustrates the detent state with the fluid outlet open;

FIG. 3a is an enlarged schematic view of the stop member of the stop mechanism of FIG. 1;

FIG. 3b shows an enlarged schematic view of the rest member of the stop mechanism of FIG. 1;

fig. 4 shows an enlarged partial cross-sectional view of an electronic expansion valve according to a second preferred embodiment of the present invention, wherein the configuration of the movable valve member and its stop mechanism is shown in detail;

fig. 5a and 5b show two stop states of the stop mechanism in fig. 4, wherein fig. 5a shows the stop state in which the fluid outlet is closed, and fig. 5b shows the stop state in which the fluid outlet is opened.

List of reference marks

An electronic expansion valve 1; a valve assembly 10; a movable valve member 11; an actuator 50; drive mechanism 40

A diversion cavity assembly 12; an inlet pipe 92; a fluid inlet 121; an outlet pipe 94; fluid outlet 122

A valve seat 18; a movable valve member first end 141; movable valve member second end 142

A stator 41; a rotor 42; a mandrel 51; a cylindrical case 421; rotor cavity 422

A holding member 60; mandrel first end 511; mandrel second end 512

A movable stop member 191; a first movable stop member 1911; platform part 1910

A second movable stop 1912; first static position member 1921

A second static position member 1922; guide sleeve 123

Detailed Description

A preferred embodiment of the present invention will now be described in detail with reference to fig. 1-5 b. The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.

First, the structure of an electronic expansion valve according to a first embodiment of the present invention will be described with reference to fig. 1. Fig. 1 shows a longitudinal sectional view of an electronic expansion valve according to a first preferred embodiment of the present invention.

According to the utility model discloses an electronic expansion valve 1 can include: a valve assembly 10 for regulating the flow rate of the fluid flowing through the electronic expansion valve 1; an actuator 50 for bringing the movable valve member 11 of the valve assembly 10 into simultaneous rotational and axial movement; and a drive mechanism 40 for powering the actuator 50.

In a preferred example, the valve assembly 10 includes a draft chamber assembly 12, the draft chamber assembly 12 including a housing defining an interior space for housing the movable valve member 11 of the valve assembly 10, and the draft chamber assembly 12 further including a fluid inlet 121 connected to the inlet tube 92 and a fluid outlet 122 connected to the outlet tube 94. The fluid flows into the electronic expansion valve 1 via the inlet pipe 92 and then flows out of the electronic expansion valve 1 via the outlet pipe 94.

In the preferred example, the baffle chamber assembly 12 further includes a valve seat 18, with the fluid outlet 122 disposed in the valve seat 18.

As mentioned above, the movable valve member 11 is rotationally and axially moved by the actuator 50, so that the movable valve member 11 can open and close the fluid outlet 122 in the valve seat 18 and can adjust the valve opening of the electronic expansion valve 1. The movable valve member 11 may include a first end (upper end) 141 for connection with a spindle 51, which will be described in detail below, and a second end (lower end) 142 for engagement with the valve seat 18 to close the fluid outlet 122.

In the illustrated example, the drive mechanism 40 may be a motor including a stator 41 and a rotor 42. The rotor 42 is rotatable in the stator 41, and the rotor 42 is injection molded integrally with the spindle 51 of the actuator 50, so that the rotor 42 is rotated integrally with the spindle 51 when the driving mechanism (motor) 40 is energized. However, it will be understood by those skilled in the art that the rotor 42 and the spindle 51 may be formed separately and then fixedly connected together by any suitable means. The rotor 42 is implemented as a cylindrical magnetic ring having an open end, a cylindrical housing 421 is provided between the rotor 42 and the stator 41 to define a rotor chamber 422, the stator 41 is fixed to the outside of the cylindrical housing 421, and the rotor 42 and the spindle 51 are both provided in the rotor chamber 422 and are capable of axial movement relative to the cylindrical housing 421 and the stator 41, which will be described in detail below.

Further, the cylindrical case 421 is fixedly connected to the outer shell of the diversion chamber assembly 12, and both the cylindrical case 421 and the diversion chamber assembly 12 are fixed with respect to the casing of the electronic expansion valve 1.

Preferably, the electronic expansion valve 1 may further include a holding member 60 having an internal thread, the holding member 60 being fixed to one end of the cylindrical housing 421 and providing support for the spindle 51, and in particular, the spindle 51 may include a first end (upper end) 511 and a second end (lower end) 512. The first end 511 is formed with an external thread and is threadedly engaged with the retaining member 60 having an internal thread, and the second end 512 is adapted to be coupled with the first end 141 of the movable valve member 11, or the spindle 51 may be integrally formed with the movable valve member 11. Thus, when the rotor 42 and the spindle 51 rotate integrally, the rotor 42 and the spindle 51 are urged to perform axial movement simultaneously through the threaded engagement between the spindle 51 and the holding member 60, so that the rotor 42 and the spindle 51 perform axial movement while performing rotational movement, and the movable valve member 11 also performs axial movement while performing rotational movement by being entrained by the spindle 51.

The stop mechanism of the electronic expansion valve according to the first preferred embodiment of the present invention will be described in detail with reference to fig. 1 to 3 b. Wherein fig. 2a and 2b show enlarged partial cross-sectional views of the electronic expansion valve of fig. 1, wherein the movable valve member and its configuration of the stop mechanism are shown in detail; FIGS. 2a and 2b show two end stop states of the end stop mechanism of FIG. 1, wherein FIG. 2a shows the end stop state with the fluid outlet closed; FIG. 2b shows a rest state in which the fluid outlet is open; FIG. 3a is an enlarged schematic view of the stop member of the stop mechanism of FIG. 1; fig. 3b shows an enlarged schematic view of the rest position of the stop mechanism in fig. 1.

In the exemplary embodiment shown in the figures, the stop mechanism comprises two moving stops 191-a first moving stop 1911 and a second moving stop 1912-and two stationary stops-a first stationary stop 1921 and a second stationary stop 1922-said two moving stops 191 being provided on the movable valve member 11 and performing both rotational and axial movements with the movable valve member 11, said two stationary stops being provided on the flow guide chamber assembly 12 and being configured to be circumferentially abuttable with said two moving stops 191, respectively, to limit the extent of the axial movement of the movable valve member 11. Preferably, the diversion cavity assembly 12 includes a guide sleeve 123, the guide sleeve 123 is configured to be clearance fit with the movable valve member 11 and to guide axial movement of the movable valve member 11, and the first and second

stationary seats

1921 and 1922 are each disposed on the guide sleeve 123.

Referring to fig. 2a and 2b, when first movable stop member 1911 circumferentially abuts first stationary stop member 1921, second end 142 of valve needle 14 closes fluid outlet 122 of valve seat 18; when second stop member 1912 circumferentially abuts second stop member 1922, the distance between second end 142 of valve needle 14 and valve seat 18 is maximized, i.e., the opening of fluid outlet 122 is maximized.

As shown in the drawings, the movable stoppers 191 and the stationary stoppers may be separate latch-like members, and corresponding insertion holes are provided on the movable valve member 11 to receive the respective movable stoppers 191 and corresponding insertion holes are provided on the guide sleeve 123 to receive the respective stationary stoppers. However, the present invention is not limited thereto, each movable stop member 191 may be integrally formed with the movable valve member 11 or fixed to the movable valve member 11 by any suitable means such as welding, bonding, clamping, plugging, etc., and each stationary stop member may be integrally formed with the guide sleeve 123 or fixed to the guide sleeve 123 or other portions of the diversion cavity assembly 12 except for the guide sleeve 123 by any suitable means such as welding, bonding, clamping, plugging, etc.

In addition, fig. 3a and 3b show preferred shapes of the motion stop member 191 and the static member, respectively, wherein the static member is generally cylindrical with a chamfer at one end for insertion into the receptacle and interference fit; the movable stopper 191 is a substantially cylindrical member having a stopper plane, and when the movable stopper 191 abuts the stationary stopper, the stopper plane of the movable stopper 191 contacts the stationary stopper, and the stopper plane is preferably formed as a flat portion 1910 as shown in the figure, and the flat portion 1910 is for circumferentially abutting against the cylindrical surface of the stationary stopper. However, the present invention is not limited thereto, and the movable stopper 191 and the stationary stopper may have any other suitable shape according to practical applications as long as the circumferential abutment of the movable stopper 191 and the stationary stopper can be achieved.

A stop mechanism of an electronic expansion valve according to a second preferred embodiment of the present invention will be described in detail with reference to fig. 4 to 5 b. Wherein fig. 4 shows a partially enlarged cross-sectional view of an electronic expansion valve according to a second preferred embodiment of the present invention, wherein the configuration of the movable valve member and its stop mechanism is shown in detail; FIGS. 5a and 5b illustrate two detent states of the detent mechanism of FIG. 4, wherein FIG. 5a illustrates the detent state with the fluid outlet closed; fig. 5b shows a stop position in which the fluid outlet is open.

The electronic expansion valve according to the second preferred embodiment of the present invention has substantially the same configuration as the electronic expansion valve of the first preferred embodiment, except that: the stop mechanism of the electronic expansion valve 1 of the second preferred embodiment includes one movable stop 191 and two stationary stops, a first stationary stop 1921 and a second stationary stop 1922, wherein the one movable stop 191 is preferably disposed at a proper position of the movable valve member 11, the first stationary stop 1921 is disposed at the lower valve seat 18 of the guide chamber assembly 12, and the second stationary stop 1922 is disposed on the guide sleeve 123.

When the check 191 abuts the first stop 1921, the second end 142 of the needle 14 closes the fluid outlet 122 of the valve seat 18; when the movable stop 191 abuts the second stationary stop 1922, the distance between the second end 142 of the valve needle 14 and the valve seat 18 is maximized, i.e., the opening degree of the fluid outlet 122 is maximized.

Although the specific arrangement positions of the respective movable stop members and the stationary stop members are disclosed in the above embodiments and the drawings, the present invention is not limited thereto, and it should be understood that, according to factors such as practical application requirements, a person skilled in the art can adjust the specific arrangement positions of the respective movable stop members and the stationary stop members to meet the requirements of the equipment, for example, the stationary stop members may not be arranged on the guide sleeve 123, but all arranged on the other parts of the diversion cavity assembly 12 except the guide sleeve 123, as long as the technical objects of the present invention can be achieved, and even, the electronic expansion valve 1 of the present invention may not include the guide sleeve 123.

Further, although in the foregoing preferred embodiment the movable stop member and the stationary member are designed to limit the axial stroke range of the movable valve member in circumferential abutment, it is possible that the movable stop member and the stationary member may be designed to limit the axial stroke range of the movable valve member in axial abutment.

Although the exemplary embodiment of the electronic expansion valve according to the present invention has been described in the foregoing embodiments, the present invention is not limited thereto, and various modifications, substitutions, and combinations may be made without departing from the scope of the present invention.

It is obvious that further different embodiments can be devised by combining different embodiments and individual features in different ways or modifying them.

The electronic expansion valve according to a preferred embodiment of the present invention has been described above with reference to the specific embodiments. It will be understood that the above description is intended to be illustrative and not restrictive, and that various changes and modifications may be suggested to one skilled in the art in view of the above description without departing from the scope of the invention. Such variations and modifications are also intended to be included within the scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

2. The electronic expansion valve of claim 1, wherein the stop mechanism comprises one movable stop member and two stationary stop members, and the stop mechanism is configured such that the one movable stop member can abut against the two stationary stop members respectively: the movable valve member closes the fluid port when the movable stop abuts a first of the two stationary stops; the distance of the movable valve member from the fluid port reaches a maximum when the movable stop abuts a second of the two stationary stops.

3. The electronic expansion valve of claim 2, wherein the baffle chamber assembly comprises a guide sleeve configured to clearance fit with and guide axial movement of the movable valve member, and wherein only one of the two stationary seats is disposed on the guide sleeve.

4. The electronic expansion valve of claim 3, wherein the other of the two rest positions is provided on a valve seat of the diversion chamber assembly defining the fluid port or a housing portion of the diversion chamber assembly.

5. The electronic expansion valve of claim 1, wherein the stop mechanism comprises two of the movable stop members and two of the stationary stop members, and the stop mechanism is configured such that the two movable stop members are respectively engageable with the two stationary stop members: said movable valve member closing said fluid port when a first of said two said movable stops abuts a first of said two stationary stops; when the second of the two stop members abuts the second of the two stationary members, the distance between the movable valve member and the fluid port reaches a maximum value.

6. The electronic expansion valve of claim 5, wherein the baffle chamber assembly comprises a guide sleeve configured to clearance fit and guide axial movement of the movable valve member, and wherein both of the stationary seats are disposed on the guide sleeve.

7. The electronic expansion valve according to any one of claims 1 to 6, wherein the movable stop member and the stationary stop member are configured to be capable of abutting each other in a circumferential direction of rotational movement of the movable valve member.

8. An electronic expansion valve according to any of claims 1-6, wherein the stop member is integrally formed with the movable valve member or is fixed to the movable valve member by means of welding, gluing, snapping or plugging, and the stop member is integrally formed with the guide chamber assembly or is fixed to the guide chamber assembly by means of welding, gluing, snapping or plugging.

9. The electronic expansion valve according to any of claims 1 to 6,

the diversion chamber assembly including a valve seat in which the fluid port is disposed, one end of the movable valve member for engaging the valve seat to close the fluid port, and

the actuator includes a spindle fixedly connected to the movable valve member and carrying the movable valve member in axial movement while performing rotational movement.

10. An electronic expansion valve according to any of claims 1-6, wherein the movable valve member is of one-piece construction.