CN215806313U

CN215806313U - Expansion valve

Info

Publication number: CN215806313U
Application number: CN202120966626.3U
Authority: CN
Inventors: 林元阳; 俞舟; 宋治国
Original assignee: Zhejiang Dunan Artificial Environment Co Ltd
Current assignee: Zhejiang Dunan Artificial Environment Co Ltd
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2022-02-11
Anticipated expiration: 2031-05-07
Also published as: JP2024516144A; KR20240004879A; WO2022233322A1

Abstract

The present invention provides an expansion valve, comprising: the valve comprises a valve seat, a valve cavity and a circulation channel which are communicated with each other are arranged in the valve seat, and a valve port is formed at the joint of the valve cavity and the circulation channel; the valve needle comprises a main body part and a throttling part which are connected with each other, the main body part is movably arranged in the valve cavity, and the throttling part is movably arranged at the valve port; the throttling part comprises a plurality of sequentially connected throttling sections, each throttling section is of a uniform-section cylindrical structure, and a connecting step is formed between every two adjacent throttling sections. Through the technical scheme provided by the utility model, the technical problem that the flow area of the expansion valve is greatly influenced by the processing precision during throttling in the prior art can be solved.

Description

Expansion valve

Technical Field

The utility model relates to the technical field of expansion valves, in particular to an expansion valve.

Background

At present, an expansion valve in the prior art generally comprises a valve seat and a valve needle, a throttling part of the valve needle generally adopts a tapered structure, and the flow area is continuously changed along with the change of a spring and the pressure difference between the front and the back of the valve during throttling. Thus, the flow rate precision completely depends on the manufacturing precision of the spring and the processing precision of the taper part of the valve needle; the problems of large influence fluctuation of the fertilization rate of the flow area during throttling and poor flow stability also exist in practical application.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an expansion valve to solve the technical problem that the flow area of the expansion valve in the prior art is greatly influenced by the processing precision during throttling.

In order to achieve the above object, the present invention provides an expansion valve comprising: the valve comprises a valve seat, a valve cavity and a circulation channel which are communicated with each other are arranged in the valve seat, and a valve port is formed at the joint of the valve cavity and the circulation channel; the valve needle comprises a main body part and a throttling part which are connected with each other, the main body part is movably arranged in the valve cavity, and the throttling part is movably arranged at the valve port; the throttling part comprises a plurality of sequentially connected throttling sections, each throttling section is of a uniform-section cylindrical structure, and a connecting step is formed between every two adjacent throttling sections.

Further, the throttling part comprises a first throttling section and a second throttling section which are connected with each other, the first throttling section is connected with the main body part, the second throttling section is arranged at one end, far away from the main body part, of the first throttling section, and the diameter of the first throttling section is larger than that of the second throttling section.

Furthermore, the throttling part also comprises a third throttling section, the third throttling section is arranged at one end, far away from the first throttling section, of the second throttling section, and the diameter of the second throttling section is larger than that of the third throttling section.

Furthermore, each throttling section is a cylindrical section structure, and the valve port is of a circular port structure.

Further, the diameter of the first throttling section is D₁The diameter of the second throttling section is D₂，1.1＜D₁/D₂＜2。

Further, the diameter of the first throttling section is D₁The diameter of the valve port is D₃，0.5＜D₁/D₃＜0.9。

Further, the diameter of the second throttling section is D₂The diameter of the valve port is D₃，0.3＜D₂/D₃＜0.8。

Further, the expansion valve further includes: the end socket is arranged on the valve seat and is positioned at one end of the valve cavity, which is far away from the flow passage; wherein the length of the flow channel is H₁The distance between one end of the seal head close to the flow passage and one end of the valve cavity close to the flow passage is H₂The length of the throttling part is L₁The distance between one end of the seal head close to the flow channel and one end of the main body part close to the flow channel is L₂，L₁+L₂＞H₁+H₂。

Furthermore, each throttling section is a cylindrical section structure, and the valve port is of a polygonal structure.

By applying the technical scheme of the utility model, the plurality of sequentially connected throttling sections are arranged, and each throttling section is of the equal-section column structure, so that the flow at each throttling section is a constant value, when the flow is regulated, only the throttling part needs to be regulated to enable the corresponding throttling section to be positioned at the valve port, and as each throttling section has a certain length, only the throttling part needs to be regulated to be within the length range of the corresponding throttling section during regulation, accurate regulation is not needed, and the condition that the flow area is greatly influenced by the taper is avoided. In addition, because the connecting step is formed between the two adjacent throttling sections, the connecting part of the two adjacent throttling sections can be prevented from being provided with a conical structure, and therefore the throttling part can be conveniently switched between different throttling states. Therefore, the technical scheme provided by the utility model can solve the technical problem that the flow area of the expansion valve in the prior art is greatly influenced by the processing precision during throttling.

Drawings

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

fig. 1 shows a cross-sectional view of an expansion valve provided according to an embodiment of the utility model;

fig. 2 is a schematic structural view illustrating a throttle portion provided according to an embodiment of the present invention in a first throttle state;

fig. 3 is a schematic structural view illustrating a throttle portion provided according to an embodiment of the present invention in a second throttle state;

figure 4 shows a schematic structural diagram of a valve needle provided in accordance with an embodiment of the present invention;

FIG. 5 illustrates a bottom view of a valve seat provided in accordance with an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a valve seat; 11. a valve cavity; 12. a flow-through channel; 13. a valve port; 20. a valve needle; 21. a main body portion; 22. a throttle section; 221. a first throttle section; 222. a second throttle section; 223. a third throttling section; 30. sealing the end; 40. a valve body; 50. a spring.

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.

As shown in fig. 1 to 5, an embodiment of the present invention provides an expansion valve, which includes a valve seat 10 and a valve needle 20, wherein a valve cavity 11 and a flow passage 12 are disposed in the valve seat 10, and a valve port 13 is formed at a joint of the valve cavity 11 and the flow passage 12. The valve needle 20 comprises a main body 21 and a throttling part 22 which are connected with each other, the main body 21 is movably arranged in the valve cavity 11, and the throttling part 22 is movably arranged at the valve port 13. The throttling portion 22 includes a plurality of sequentially connected throttling sections, each throttling section is of a uniform cross-section cylindrical structure, and a connecting step is formed between every two adjacent throttling sections.

Adopt the expansion valve that this embodiment provided, through setting up a plurality of throttle sections that connect gradually, and each throttle section is uniform cross-section column structure, can make the circulation of each throttle section department be a constant value like this, when adjusting the flow, only need with throttle portion 22 adjust to make the throttle section that corresponds be located valve port 13 department can, because each throttle section department all has certain length, only need when adjusting with throttle portion 22 adjust to the length range of the throttle section that corresponds can, need not carry out accurate regulation, the great condition of flow area receives the tapering influence has also been avoided. In addition, because the connecting step is formed between two adjacent throttling sections, the connecting part of the two adjacent throttling sections can be prevented from being provided with a conical structure, so that the throttling part 22 can be conveniently switched between different throttling states. Therefore, the expansion valve provided by the embodiment can solve the technical problem that the flow area of the expansion valve in the prior art is greatly influenced by the processing precision during throttling.

In the present embodiment, the throttling portion 22 includes a first throttling section 221 and a second throttling section 222 which are connected with each other, the first throttling section 221 is connected with the main body portion 21, the second throttling section 222 is arranged at one end of the first throttling section 221 far away from the main body portion 21, and the diameter of the first throttling section 221 is larger than that of the second throttling section 222. With such a structural arrangement, when the first throttling section 221 moves to the valve port 13, the throttling part 22 is at a first throttling position corresponding to a first throttling state; when the second throttle section 222 moves to the valve port 13, the throttle portion 22 is at the second throttle position corresponding to the second throttle state. Since the diameter of the first throttle section 221 is larger than the diameter of the second throttle section 222, the flow rate of the throttle portion 22 at the first throttle position is smaller than the flow rate of the throttle portion 22 at the second throttle position.

In the present embodiment, a first step is formed at the junction of the first throttle section 221 and the second throttle section 222. By adopting the structure, the connection part of the first throttling section 221 and the second throttling section 222 can be prevented from being arranged in a tapered structure, so that the throttling part 22 can be directly switched from the first throttling state to the second throttling state, or the throttling part 22 can be directly switched from the second throttling state to the first throttling state, and the accuracy of the switching of the throttling states is improved.

Specifically, the throttling part 22 further comprises a third throttling section 223, the third throttling section 223 is arranged at one end of the second throttling section 222 far away from the first throttling section 221, and the diameter of the second throttling section 222 is larger than that of the third throttling section 223. With this arrangement, when the third throttling section 223 moves to the valve port 13, the throttling portion 22 is in a third throttling position corresponding to a third throttling state. Since the diameter of the second throttle section 222 is greater than the diameter of the third throttle section 223, the flow rate of the throttle 22 in the second throttle position is less than the flow rate of the throttle 22 in the third throttle position.

In the present embodiment, the junction of the second throttling section 222 and the third throttling section 223 forms a second step. By adopting the structure, the connection part of the second throttling section 222 and the third throttling section 223 can be prevented from being arranged in a tapered structure, so that the throttling part 22 can be directly switched from the second throttling state to the third throttling state, or the throttling part 22 can be directly switched from the third throttling state to the second throttling state, and the accuracy of the throttling state switching is improved.

Specifically, in one embodiment, each throttling section is a cylindrical section structure, and the valve port 13 is a circular port structure. By adopting the structure, the throttling section and the valve port 13 are in a shape matched with each other, and the first throttling section 221 can be used for fitting and blocking the valve port 13 to prevent liquid from flowing out of the flow channel 12.

In the present embodiment, the diameter of the first throttling section 221 is D₁The diameter of the second throttling section 222 is D₂，1.1＜D₁/D₂Is less than 2. By adopting the structure, the proportional relation between the first throttling part 22 and the second throttling part 22 can be optimized, the appearance structure of the throttling part 22 is optimized, the progressive structure of the throttling part 22 is conveniently formed, and the reasonable adjustment of the flow at the valve port 13 is facilitated.

Specifically, the diameter of the first throttling section 221 in this embodiment is D₁The diameter of the valve port 13 is D₃，0.5＜D₁/D₃Is less than 0.9. With such a structure, it is convenient to reasonably adjust the flow rate at the valve port 13 in the first throttling state, and it is also convenient to have a sufficient active space between the first throttling section 221 and the valve port 13.

In the present embodiment, the diameter of the second throttling section 222 is D₂The diameter of the valve port 13 is D₃，0.3＜D₂/D₃Is less than 0.8. With such a structure, the flow at the valve port 13 can be conveniently and reasonably adjusted in the second throttling state, and a sufficient active space is provided between the first throttling section 221 and the valve port 13.

Specifically, the expansion valve in this embodiment further includes a sealing head 30, the sealing head 30 is mounted on the valve seat 10, and the sealing head 30 is located at one end of the valve cavity 11 far away from the flow passage 12. Wherein the length of the flow channel 12 is H₁The distance between the end of the sealing head 30 close to the flow passage 12 and the end of the valve cavity 11 close to the flow passage 12 is H₂The length of the throttle part 22 is L₁The distance between the end of the sealing head 30 close to the flow channel 12 and the end of the main body 21 close to the flow channel 12 is L₂，L₁+L₂＞H₁+H₂. By adopting the structure, no matter how many sections of the throttling section are, the most front end of the valve needle 20 can not be separated from the valve port 13 all the time, and the valve port 13 can be throttled stably.

In another embodiment, each throttling section is a cylindrical section structure, the corresponding cross-sectional area of each throttling section is different, so that the throttling area of each throttling section is different when throttling, and the valve port 13 is a polygonal structure. Because each throttling section is of a cylindrical section structure, when the first throttling section 221 of the throttling part 22 closes the valve port 13, a flow gap still exists between the valve port 13 and the first throttling section 221, that is, a small amount of liquid can still flow out of the valve port 13.

In all the above embodiments, the expansion valve includes the valve body 40 and the spring 50, the valve body 40 is connected to the refrigeration system, the valve seat 10 is disposed inside the valve body 40, and the valve seat 10 has the valve port 13. The main body part 21 of the valve needle 20 is arranged inside the valve seat 10, one end of the throttling part 22 of the valve needle 20 extends into the valve port 13, the valve needle 20 moves along the axial direction of the valve cavity 11 to adjust the flow area at the valve port 13, the throttling part 22 of the valve needle 20 adopts a multi-section type similar stepped shaft structure, and when each straight section works with the throttling function of the valve port 13, the flow area is constant. The utility model adopts the valve needle 20 with a multi-section type similar stepped shaft structure, and ensures that the flow area of the valve port 13 is constant and the flow is natural and more stable at each working condition pressure difference point.

Specifically, because the valve needle 20 adopts the valve needle 20 with the multi-section stepped shaft structure, the flow areas formed when the valve needle 20 and the valve port 13 are in the cross section of the valve needle 20 and are at the straight section of the valve needle 20, the influence of the machining precision of the spring 50 on the flow area of the valve port 13 is reduced, the influence of the taper machining precision of the valve needle 20 is removed, the factors influencing the flow area of the valve port 13 are reduced to the minimum, and the flow stability is greatly improved.

As shown in fig. 2: in operating mode 1 (first throttle position), the first throttle section 221 of the valve needle 20 has a diameter D₁) And valve port 13 (diameter D)₃) A throttling effect is generated, and the flow area of the valve port 13 is S1 ═ pi (D)₃ ²-D₁ ²)/4. In addition, as long as the length range of the first throttle section 221 is disposed opposite to the valve port 13, the flow area of the valve port 13 is always constant at S1, and the flow rate at this time is only affected by the pressure difference between the front and rear sides of the valve.

As shown in fig. 3: in the operating condition 2 (the second throttling state), the first throttling section 221 is completely separated from the valve port 13, the second throttling section 222 performs a throttling function with the valve port 13, and the flow area of the valve port 13 is S1 ═ pi (D)₃ ²-D₂ ²) And 4, the flow area of the valve port 13 is always constant at S2, the flow rate at this time is only influenced by the pressure difference before and after the valve, and S2 > S1 is always established.

When the expansion valve in this embodiment is assembled, the valve needle 20 is placed in the valve seat 10, one end of the valve needle 20 extends out of the valve port 13, the spring 50 is placed in the valve seat 10, the guiding section of the spring 50 of the sealing head 30 is placed in the valve seat 10 along the inner hole of the spring 50, and then the sealing head 30 is riveted to form the valve seat 10 component. Subsequently, the valve seat 10 component is placed into the valve body 40, and completed with the tooling for locating the neck.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the processing precision of the throttling part is reduced, the manufacturing precision of the spring is reduced, the manufacturing cost is reduced, the valve port flow area is kept constant under multiple working conditions (different throttling states), and the flow stability of the expansion valve is greatly 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 application 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 application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; 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 protection of the present application is not to 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 expansion valve, comprising:

the valve comprises a valve seat (10), wherein a valve cavity (11) and a circulation channel (12) which are communicated with each other are arranged in the valve seat (10), and a valve port (13) is formed at the joint of the valve cavity (11) and the circulation channel (12);

the valve needle (20), the valve needle (20) comprises a main body part (21) and a throttling part (22) which are connected with each other, the main body part (21) is movably arranged in the valve cavity (11), and the throttling part (22) is movably arranged at the valve port (13);

the throttling part (22) comprises a plurality of sequentially connected throttling sections, each throttling section is of a uniform-section cylindrical structure, and a connecting step is formed between every two adjacent throttling sections.

2. An expansion valve according to claim 1, wherein the throttle portion (22) comprises a first throttle section (221) and a second throttle section (222) connected to each other, the first throttle section (221) being connected to the main body portion (21), the second throttle section (222) being arranged at an end of the first throttle section (221) remote from the main body portion (21), the first throttle section (221) having a larger diameter than the second throttle section (222).

3. An expansion valve according to claim 2, wherein the throttle part (22) further comprises a third throttle section (223), the third throttle section (223) being arranged at an end of the second throttle section (222) remote from the first throttle section (221), the diameter of the second throttle section (222) being larger than the diameter of the third throttle section (223).

4. An expansion valve according to any of claims 1-3, wherein each of the throttling sections is of cylindrical segment construction and the valve port (13) is of circular port construction.

5. An expansion valve according to claim 3, wherein the diameter of the first restriction section (221) is D₁The diameter of the second throttling section (222) is D₂，1.1＜D₁/D₂＜2。

6. An expansion valve according to claim 3, wherein the diameter of the first restriction section (221) is D₁The diameter of the valve port (13) is D₃，0.5＜D₁/D₃＜0.9。

7. An expansion valve according to claim 3, wherein the diameter of the second restriction section (222) is D₂The diameter of the valve port (13) is D₃，0.3＜D₂/D₃＜0.8。

8. An expansion valve according to claim 1, further comprising:

the end socket (30) is arranged on the valve seat (10), and the end socket (30) is positioned at one end, far away from the flow channel (12), of the valve cavity (11);

wherein the length of the flow channel (12) is H₁The distance between one end of the seal head (30) close to the circulation channel (12) and one end of the valve cavity (11) close to the circulation channel (12) is H₂The length of the throttling part (22) is L₁The distance between one end of the seal head (30) close to the circulation channel (12) and one end of the main body part (21) close to the circulation channel (12) is L₂，L₁+L₂＞H₁+H₂。

9. An expansion valve according to any of claims 1-3, wherein each of the throttling sections is a cylindrical section structure and the valve port (13) is a polygonal structure.