CN217736277U

CN217736277U - Electronic expansion valve

Info

Publication number: CN217736277U
Application number: CN202220236777.8U
Authority: CN
Inventors: 贺宇辰; 刘曈晖; 徐冠军
Original assignee: Zhejiang Dunan Artificial Environment Co Ltd
Current assignee: Zhejiang Dunan Artificial Environment Co Ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-11-04
Anticipated expiration: 2032-01-26
Also published as: WO2023143024A1

Abstract

The utility model provides an electronic expansion valve, which comprises a valve shell; a valve core assembly; the disk seat, the disk seat is connected with the valve casing, it holds the chamber to have between disk seat and the valve casing, the movably setting of case subassembly is holding the intracavity, be provided with the valve port on the disk seat, the valve port is including the first cylinder section and a plurality of changeover portion that connect in order, first cylinder section is close to the setting of case subassembly, every changeover portion has relative head end and the end that sets up, the head end of changeover portion is close to the setting of case subassembly, the head end diameter of the changeover portion that is connected with first cylinder section in a plurality of changeover portions is the same with the diameter of first cylinder section, and the diameter of the head end of every changeover portion is less than the terminal diameter of this changeover portion, the diameter of the terminal of the changeover portion that is close to the case subassembly in the adjacent changeover portion is the same with the diameter of the head end of the changeover portion of keeping away from the case subassembly. Adopt this technical scheme to fluid among the solution prior art forms the problem of swirl in valve port department.

Description

Electronic expansion valve

Technical Field

The utility model relates to a valve technical field particularly, relates to an electronic expansion valve.

Background

In the prior art, a valve port of an electronic expansion valve includes a plurality of connected flow sections, but generally, adjacent flow sections have different diameters at the connection, that is, a step surface is provided at the connection of the flow sections. When the valve is actually used, when fluid flows from the valve cavity to the valve port, vortex is easily formed at the valve port, so that the flowing noise of the fluid is higher, the vortex enables the flow resistance of the fluid to be increased, and the flow speed of the fluid is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electronic expansion valve to solve the problem that the fluid among the prior art forms the swirl in valve port department.

The utility model provides an electronic expansion valve, include: a valve housing; a valve core assembly; the disk seat, the disk seat is connected with the valve casing, it holds the chamber to have between disk seat and the valve casing, the movable setting of case subassembly is holding the intracavity, be provided with the valve port on the disk seat, the valve port is including first cylinder section and a plurality of changeover portion that connect in order, first cylinder section is close to the setting of case subassembly, every changeover portion has relative head end and the end that sets up, the head end of changeover portion is close to the setting of case subassembly, the head end diameter of the changeover portion that is connected with first cylinder section in a plurality of changeover portions is the same with the diameter of first cylinder section, and the diameter of the head end of every changeover portion is less than the terminal diameter of this changeover portion, the diameter that is close to the terminal of the changeover portion of case subassembly in the adjacent changeover portion is the same with the diameter of the head end of the changeover portion of keeping away from the case subassembly.

Use the technical scheme of the utility model, set up a plurality of changeover portions between first cylinder section and second cylinder section, the diameter of the head end of every changeover portion is less than the terminal diameter of this changeover portion to set up the tip diameter of the link of two adjacent changeover portions the same, so can cancel the step face, make the fluid flow rate slow change when the circulation in the valve port, and then can make the fluid steadily flow, reduce the noise that the fluid flows.

Furthermore, the valve port further comprises a second cylindrical section, the second cylindrical section is connected with one end, far away from the valve core assembly, of the transition section, and the diameter of the tail end of the transition section, connected with the second cylindrical section, of the transition sections is the same as that of the second cylindrical section.

Further, each transition section is a tapered section, and the taper angle of the plurality of transition sections gradually decreases towards the direction away from the valve core assembly. The transition section is provided with the conical section, so that the side wall of the transition section is smooth, the flow speed of the fluid can be slowly changed when the fluid flows in the transition section, and the noise and the flow resistance of the fluid flow are further reduced.

Further, the plurality of transition sections includes a first tapered section connected to the first cylindrical section, the first tapered section having a taper angle α,180 ° > α > 90 °. The angle is more than 180 degrees and more than 90 degrees, namely, the fluid can not form a vortex at one end of the first cylindrical section 21 far away from the valve core assembly, and the whole length of the valve port 20 can be smaller.

Furthermore, the diameter of the first cylindrical section is d, the diameter of the tail end of the first conical section is d1, and d1 is more than or equal to 4d and more than or equal to 1.1d. D1 is set to be more than or equal to 4d and more than or equal to 1.1d, so that the flow speed of the fluid in the valve port 20 can be uniformly changed, the fluid can stably flow, and the noise generated by the fluid is further reduced.

Further, the transition sections comprise a second conical section, the second conical section is arranged at one end, far away from the valve core assembly, of the first conical section, the conical angle of the second conical section is beta, and the conical angle is larger than 50 degrees and larger than or equal to 25 degrees. The angle is more than 50 degrees and beta is more than or equal to 25 degrees, so that the whole length of the valve port 20 can be smaller, and the fluid noise can be smaller.

Furthermore, the length of the first cylindrical section is L, and L is more than 5mm and is more than or equal to 0.5mm. The L is larger than 5mm and larger than or equal to 0.5mm, so that the first cylindrical section 21 can be better plugged by the valve core assembly, and the whole volume of the valve seat 10 can be smaller.

Furthermore, the bottom of the valve seat is provided with a connecting bulge, part of the valve port penetrates through the connecting bulge, the difference value between the inner diameter and the outer diameter of the end part, far away from the valve port, of the connecting bulge is A, and the A is more than or equal to 0.8mm and more than or equal to 0.3mm. A is set to be more than or equal to 0.8mm and more than or equal to 0.3mm, so that the structural strength of the connecting lug boss 30 is good, and the vortex generated by fluid at the end face of the connecting lug boss 30 can be avoided.

Furthermore, the electronic expansion valve also comprises a connecting pipe, the connecting pipe is sleeved outside the connecting convex part, and a welding gap is formed between the end part of the connecting convex part and the inner wall of the connecting pipe. The welding gap 50 is provided to facilitate welding of the inner wall of the connection pipe 40 and the outer wall of the connection boss 30 together.

Further, the side of the valve seat is provided with a fluid opening, and the fluid opening is communicated with the accommodating cavity. The fluid opening 11 and the valve port 20 serve as an inlet and an outlet for fluid, respectively.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the scope of the invention. In the drawings:

fig. 1 shows a schematic structural diagram of an electronic expansion valve provided by the present invention;

fig. 2 shows a schematic structural diagram of an electronic expansion valve provided by the present invention;

fig. 3 is a schematic diagram illustrating a fluid flow direction of the electronic expansion valve provided by the present invention.

Wherein the figures include the following reference numerals:

10. a valve seat; 11. a fluid opening; 20. a valve port; 21. a first cylindrical section; 22. a second cylindrical section; 23. a first conical section; 24. a second conical section; 30. a boss portion; 40. a connecting pipe; 50. and (7) welding the gap.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 3, an embodiment of the present invention provides an electronic expansion valve, which includes a valve housing, a valve core assembly and a valve seat 10. The valve seat 10 is connected with the valve casing, the chamber is held between valve seat 10 and the valve casing, the movably setting of case subassembly is in holding the intracavity, be provided with valve port 20 on the valve seat 10, valve port 20 is including first cylinder section 21 and a plurality of changeover portion that connect in order, first cylinder section 21 is close to the setting of case subassembly, every changeover portion has the head end and the end of relative setting, the head end of changeover portion is close to the setting of case subassembly, the head end diameter of the changeover portion that is connected with first cylinder section 21 in a plurality of changeover portions is the same with the diameter of first cylinder section 21, and the diameter of the head end of every changeover portion is less than the diameter of the end of this changeover portion, the diameter of the end of the changeover portion that is close to the case subassembly in the adjacent changeover portion is the same with the diameter of the head end of the changeover portion of keeping away from the case subassembly. The valve core assembly can be used for blocking or opening the valve port 20. The arrows in fig. 3 represent a schematic flow diagram of fluid within the valve port 20.

Use the technical scheme of the utility model, valve port 20 is including the first cylinder section 21 and a plurality of changeover portion that connect in order, the head end diameter of the changeover portion that is connected with first cylinder section 21 is the same with the diameter of first cylinder section 21, the diameter of the head end of every changeover portion is less than the terminal diameter of this changeover portion, and the tip diameter of the link with two adjacent changeover portions sets up the same, so can cancel the step face, make the fluid flow rate slow change when the circulation in the valve port, and then can make the fluid steady flow, reduce the noise that the fluid flows.

In this embodiment, the valve port further includes a second cylindrical section 22, the second cylindrical section 22 is connected to an end of the transition section away from the valve core assembly, and a diameter of an end of the transition section connected to the second cylindrical section 22 in the plurality of transition sections is the same as a diameter of the second cylindrical section 22. The second cylindrical section 22 is arranged, so that the length of the valve port can be prolonged, and other structures can be conveniently connected to the valve port.

Specifically, the diameter of the head end of the transition section connected with the first cylindrical section 21 is the same as that of the first cylindrical section 21, so that a step surface is prevented from being formed between the first cylindrical section 21 and the transition section, and thus, the fluid is prevented from forming a vortex at the connection part of the first cylindrical section 21 and the transition section, and the flow resistance and the noise of the fluid are smaller; the diameter of the tail end of the transition section connected with the second cylindrical section 22 is the same as that of the second cylindrical section 22, and a step surface is avoided between the transition section and the second cylindrical section 22, so that the fluid is prevented from forming a vortex at the joint of the transition section and the second cylindrical section 22, and the flow resistance of the fluid is smaller and the noise is smaller; the diameter of the tail end of the transition section close to the valve core assembly in the adjacent transition sections is the same as that of the head end of the transition section far away from the valve core assembly, so that the fluid can be prevented from forming a vortex at the connecting part of the adjacent transition sections, and the flow resistance of the fluid is small and the noise is small.

The side wall of the transition section can be an inclined plane or an arc surface. In this embodiment, each of the transition sections is a tapered section, and the taper angles of the plurality of transition sections gradually decrease in a direction away from the valve core assembly. The transition section is provided with the conical section, so that the side wall of the transition section is smooth, the flow speed of the fluid can be slowly changed when the fluid flows in the transition section, and the noise and the flow resistance of the fluid flow are further reduced. The taper angle of the transition sections is gradually reduced towards the direction far away from the valve core assembly, so that the cross section area of the inner side wall of the transition sections is increased and decreased towards the direction far away from the valve core assembly, and therefore fluid can flow smoothly in the valve port, and the flowing noise of the fluid is reduced.

As shown in fig. 2, the plurality of transition sections comprises a first tapered section 23, the first tapered section 23 is connected to the first cylindrical section 21, and the taper angle of the first tapered section 23 is α,180 ° > α > 90 °. If the angle alpha is 180 degrees, the first conical section 23 is not conical, and fluid can form a vortex at one end of the first cylindrical section 21 far away from the valve core assembly, so that fluid noise and flow resistance are increased; if the alpha is less than or equal to 90 degrees, the change speed of the cross-sectional area of the first conical section 23 from the head end to the tail end is slow, and the taper angle of the transition section at the end, far away from the valve core assembly, of the first conical section 23 is too small, so that the length of each transition section is required to be long to meet the structural design of the valve port 20, and the overall length of the valve port 20 is increased; therefore, the angle is set to be 180 degrees > alpha > 90 degrees, namely, the fluid can not form a vortex at one end of the first cylindrical section 21 far away from the valve core assembly, and the whole length of the valve port 20 can be smaller. In the present embodiment, α may be set to 100 °, 120 °, 140 °, or 170 °.

In the present embodiment, the diameter of the first cylindrical section 21 is d, and the diameter of the end of the first tapered section 23 is d1,4d ≧ d1 ≧ 1.1d. If d1 is less than 1.1d, the difference between the diameter of the tail end of the first conical section 23 and the diameter of the first cylindrical section 21 is smaller, and the length of the first conical section 23 is smaller, so that the lengths of other transition sections are required to be longer, the increase speed of the cross-sectional area of the transition section in the direction away from the valve core assembly is uneven, and the change of the flow speed of the fluid is uneven; if d1 is greater than 4d, the diameter of the end of the first conical section 23 is smaller than that of the second cylindrical section 22, which results in smaller lengths of the second conical section 24 and other transition sections, which also results in uneven increase speed of the cross-sectional area of the transition sections towards the direction away from the valve core assembly, and thus uneven change of the flow rate of the fluid; therefore, the setting of 4d is larger than or equal to d1 and larger than or equal to 1.1d, the flow speed of the fluid in the valve port 20 can be uniformly changed, the fluid can flow smoothly, and the noise generated by the fluid is further reduced. Specifically, in the present embodiment, d1=1.1d, d1=2d, or d1=4d may be used.

In the present embodiment, the transition sections include a second conical section 24, the second conical section 24 is disposed at an end of the first conical section 23 far away from the spool assembly, and the conical angle of the second conical section 24 is β, where 50 ° > β ≧ 25 °. If β is less than 25 °, the length of the second conical section 24 is longer, resulting in a larger overall length of the valve port 20, increasing the volume of the valve seat 10; if beta is larger than or equal to 50 degrees, the taper angles of other transition sections are larger, so that the lengths of the transition sections are shorter, the change speed of the cross-sectional areas of the transition sections is higher, the change speed of the flow velocity of the fluid is higher, and the noise of the fluid is higher; therefore, 50 ° > β ≧ 25 ° is set, and the entire length of the valve port 20 can be made small, and the fluid noise can be made small. In this embodiment, β may be 25 °, 35 °, or 45 °.

Specifically, the length of the first cylindrical section 21 is L, and L is more than 5mm and is more than or equal to 0.5mm. If L is less than 0.5mm, the matching area of the inner side wall of the first cylindrical section 21 and the valve core assembly is smaller, so that the effect of plugging the first cylindrical section 21 by the valve core assembly is poorer; if L is larger than or equal to 5mm, the length of the first cylindrical section 21 is longer, so that the whole length of the valve port 20 is longer, the whole volume of the valve seat 10 is larger, and the space occupied by the electronic expansion valve is increased; therefore, the L is more than 5mm and more than or equal to 0.5mm, the first cylindrical section 21 can be well blocked by the valve core assembly, and the whole volume of the valve seat 10 can be smaller. In this embodiment, L may be 0.5mm, 2mm, or 4.5mm.

In the embodiment, the bottom of the valve seat 10 is provided with the connecting protrusion 30, part of the valve port 20 penetrates through the connecting protrusion 30, the difference between the inner diameter and the outer diameter of the end part of the connecting protrusion 30 far away from the valve port 20 is a, and 0.8mm is greater than or equal to a and greater than or equal to 0.3mm. If a < 0.3mm, the thickness of the end of the connection boss 30 remote from the valve port 20 is too small, resulting in a low strength of the connection boss 30; if a is greater than 0.8mm, the end face structure size of the connection boss 30 far away from the valve port 20 is large, and when fluid is easy to generate vortex at the end face of the connection boss 30, the flow resistance of the fluid is large and the noise is large; therefore, setting A to be more than or equal to 0.8mm and more than or equal to 0.3mm not only can enable the structural strength of the connecting lug boss 30 to be better, but also can avoid the vortex generated by the fluid at the end face of the connecting lug boss 30. In this embodiment, a may be 0.3mm, 0.5mm, or 0.8mm.

In this embodiment, the electronic expansion valve further includes a connecting pipe 40, the connecting pipe 40 is sleeved outside the connecting protrusion 30, and a welding gap 50 is formed between an end of the connecting protrusion 30 and an inner wall of the connecting pipe 40. The fluid flows through the valve port 20 and into the connecting pipe 40. The welding gap 50 is provided to facilitate welding of the inner wall of the connection pipe 40 and the outer wall of the connection boss 30 together.

Specifically, the side of the valve seat 10 is provided with a fluid opening 11, and the fluid opening 11 communicates with the accommodation chamber. The fluid opening 11 and the valve port 20 serve as an inlet and an outlet for fluid, respectively.

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.

Unless specifically stated 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. 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 should be understood that the directions or positional relationships indicated by the directional terms such as "front, back, upper, lower, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, and in the case of not making a contrary explanation, these directional terms do not indicate and imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore, should not be construed 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.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown 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 terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". 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 do not have 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 housing;

a valve core assembly;

the valve core assembly comprises a valve seat (10), the valve seat (10) is connected with the valve casing, an accommodating cavity is formed between the valve seat (10) and the valve casing, the valve core assembly is movably arranged in the accommodating cavity, a valve port (20) is arranged on the valve seat (10), the valve port (20) comprises a first cylindrical section (21) and a plurality of transition sections which are connected in sequence, the first cylindrical section (21) is arranged close to the valve core assembly, each transition section is provided with a head end and a tail end which are oppositely arranged, the head end of each transition section is arranged close to the valve core assembly, the head end diameter of the transition section which is connected with the first cylindrical section (21) in the plurality of transition sections is the same as the diameter of the first cylindrical section (21), the diameter of the head end of each transition section is smaller than the diameter of the tail end of the transition section, and the diameter of the tail end of the transition section which is close to the valve core assembly in the adjacent transition sections is the same as the diameter of the head end of the transition section which is far away from the valve core assembly.

2. The electronic expansion valve according to claim 1, wherein the valve port further comprises a second cylindrical section (22), the second cylindrical section (22) is connected to an end of the transition section away from the valve core assembly, and a diameter of an end of the transition section connected to the second cylindrical section (22) among the transition sections is the same as a diameter of the second cylindrical section (22).

3. The electronic expansion valve of claim 1, wherein each of the transition sections is a tapered section, and the taper angle of the plurality of transition sections decreases away from the valve core assembly.

4. An electronic expansion valve according to claim 1, wherein a number of the transition sections comprises a first conical section (23), the first conical section (23) being connected to the first cylindrical section (21), the first conical section (23) having a cone angle α,180 ° > α > 90 °.

5. The electronic expansion valve according to claim 4, wherein the diameter of the first cylindrical section (21) is d, and the diameter of the end of the first conical section (23) is d1, and 4d ≧ d1 ≧ 1.1d.

6. The electronic expansion valve according to claim 4, wherein the plurality of transition sections comprises a second conical section (24), the second conical section (24) is disposed at an end of the first conical section (23) away from the valve core assembly, and the conical angle of the second conical section (24) is β,50 ° > β ≧ 25 °.

7. An electronic expansion valve according to claim 1, wherein the length of the first cylindrical section (21) is L,5mm > L ≧ 0.5mm.

8. An electronic expansion valve according to claim 1, wherein a connecting protrusion (30) is disposed at the bottom of the valve seat (10), a portion of the valve port (20) penetrates through the connecting protrusion (30), and the difference between the inner diameter and the outer diameter of the end of the connecting protrusion (30) away from the valve port (20) is A, wherein A is greater than or equal to 0.8mm and greater than or equal to 0.3mm.

9. An electronic expansion valve according to claim 8, further comprising a connecting pipe (40), wherein the connecting pipe (40) is sleeved outside the connecting protrusion (30), and a welding gap (50) is formed between the end of the connecting protrusion (30) and the inner wall of the connecting pipe (40).

10. An electronic expansion valve according to claim 1, wherein a side of the valve seat (10) is provided with a fluid opening (11), the fluid opening (11) communicating with the receiving chamber.