WO2021098302A1

WO2021098302A1 - Electronic expansion valve

Info

Publication number: WO2021098302A1
Application number: PCT/CN2020/109830
Authority: WO
Inventors: 曾庆军; 赵俊; 黄鸿峰
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2019-11-19
Filing date: 2020-08-18
Publication date: 2021-05-27
Also published as: JP2023501160A; KR20220084412A; CN112901790B; CN112901790A

Abstract

Provided is an electronic expansion valve, comprising: a valve seat assembly (10), the valve seat assembly (10) having a valve cavity in communication with a first connecting pipe (50); a nut (20), the nut (20) being arranged in the valve cavity, an outer wall of the nut (20) being provided with a positioning part (21) extending in an axial direction and a notch part (22) open in a radial direction, the positioning part (21) being in contact fit with an inner wall of the valve cavity, and the notch part (22) surrounding the outer side of a port of the first connecting pipe (50); a valve element assembly (30), the valve element assembly (30) being movably arranged on the nut (20) in a penetrating manner and being in threaded fit with the nut (20), and the valve element assembly (30) controlling an on-off state of the electronic expansion valve by changing the position relationship thereof with the valve seat assembly (10); and a rotor assembly (40), the rotor assembly (40) being rotationally arranged relative to the valve seat assembly (10) and being connected to the valve element assembly (30), the rotor assembly (40) driving the valve element assembly (30) to rotate synchronously and changing the on-off state of the electronic expansion valve. The problem of the electronic expansion valve having poor installation precision is solved.

Description

Electronic expansion valve

Technical field

This application relates to the technical field of valves, and specifically to an electronic expansion valve.

Background technique

Most of the existing electronic expansion valves are provided with a guide sleeve and a nut at the same time. The guide sleeve is used to guide the valve core assembly, and the nut is installed on the guide sleeve. The nut also relies on the cooperation between the guide sleeve to achieve positioning, but this setting The number of parts is large, the cost is high, and the installation accuracy is also poor, and accurate assembly cannot be achieved.

Summary of the invention

The main purpose of this application is to provide an electronic expansion valve to solve the problem of poor installation accuracy of the electronic expansion valve in the prior art.

In order to achieve the above objective, the present application provides an electronic expansion valve, including: a valve seat assembly, the valve seat assembly has a valve cavity communicating with a first connecting pipe; a nut, the nut is arranged in the valve cavity, the outer wall of the nut has an axis along the axis A positioning portion extending toward the radial direction and a notch portion opening toward the radial direction. The positioning portion contacts and fits with the inner wall of the valve cavity, and the notch portion surrounds the outside of the port of the first connecting pipe; the valve core assembly, the valve core assembly is movably penetrated on the nut, The valve core assembly controls the on-off state of the electronic expansion valve by changing the positional relationship with the valve seat assembly; the rotor assembly, the rotor assembly is rotatably arranged relative to the valve seat assembly, and is connected with the valve core assembly, The rotor assembly drives the spool assembly to rotate synchronously, and changes the on-off state of the electronic expansion valve.

In an optional embodiment, at least a part of the first connecting pipe extends into the notch.

In an optional embodiment, the nut further includes a guide section and a threaded section that are connected in sequence. The valve core assembly is threaded on the guide section and the threaded section, and is threaded with the threaded section. The guide section is opposite to the valve core assembly. Axial movement is guided.

In an optional embodiment, the valve core assembly includes a screw and a valve needle, the screw is matched with the threaded section, the valve needle and the valve seat assembly cooperate to control the on-off state of the electronic expansion valve, and the guide section includes a first guide section and a second guide section. Two guide sections, the screw is matched with the first guide section, and the valve needle is matched with the second guide section.

In an optional embodiment, the first guide section and the second guide section are respectively located at two ends of the threaded section.

In an optional embodiment, the nut further includes a third guide section, the third guide section cooperates with the valve seat assembly, and a part of the valve seat assembly extends into the third guide section and is connected to the inner wall of the third guide section. Contact coordination.

In an optional embodiment, the nut has a radially opened through hole on one side surface close to the first connecting pipe, and the through hole is in communication with the first connecting pipe.

In an optional embodiment, there are a plurality of through holes, which are arranged at intervals along the circumferential direction of the nut, and the through holes are circumferentially misaligned with the first connecting pipe.

In an alternative embodiment, the flow area of the through hole is larger than the area of the valve port on the valve seat assembly.

In an alternative embodiment, the through hole is arched.

Applying the technical solution of the present application, the nut is provided with a positioning portion and a notch portion, wherein the positioning portion extends in the axial direction so that the axial position of the nut can be guided and positioned when the nut is installed on the valve seat assembly, so as to ensure The coaxiality of the nut is installed, and the notch opens in the radial direction, so as to guide and locate the circumferential position of the nut to ensure the accuracy of the circumferential installation of the nut. The above arrangement method can reliably guide and position the nut in the axial and circumferential directions during installation through the positioning part and the notch, to ensure the verticality and coaxiality of the nut installation, and to ensure that the nut is in the center of the product, thereby ensuring that the nut is in the center of the product. The effect of the installation accuracy of the nut, and because the nut is directly matched with the valve seat assembly and the first connecting pipe, there is no need to pass through the guide sleeve, so there is no need to set the guide sleeve, thereby reducing the number of parts and simplifying the electronic expansion valve The structure reduces the cost.

Description of the drawings

The drawings of the specification forming a part of the application are used to provide a further understanding of the application, and the exemplary embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation of the application. In the attached picture:

Fig. 1 shows a schematic structural diagram of an electronic expansion valve in the first embodiment of the present application;

Fig. 2 shows a schematic structural view of the nut of the electronic expansion valve in Fig. 1;

Fig. 3 shows a schematic structural diagram of an electronic expansion valve in the second embodiment of the present application;

Fig. 4 shows a schematic structural diagram of the electronic expansion valve nut in Fig. 3;

Figure 5 shows a front view of the nut in Figure 4; and

Fig. 6 shows a bottom view of the nut in Fig. 4.

Among them, the above drawings include the following reference signs:

10. Valve seat assembly; 20. Nut; 21. Positioning part; 22. Notch part; 23. Thread section; 24. First guide section; 25. Second guide section; 26. Third guide section; 27. Through hole 30, valve core assembly; 31, screw; 32, valve needle; 33, spring; 40, rotor assembly; 50, first connecting pipe; 60, second connecting pipe.

Detailed ways

It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the present application will be described in detail with reference to the drawings and in conjunction with the embodiments.

In order to solve the problem of poor installation accuracy of the electronic expansion valve in the prior art, the present application provides an electronic expansion valve.

Example one

An electronic expansion valve as shown in Figures 1 and 2 includes a valve seat assembly 10, a nut 20, a valve core assembly 30 and a rotor assembly 40. The valve seat assembly 10 has a valve cavity communicating with a first connecting pipe 50; a nut; 20 is arranged in the valve cavity. The outer wall of the nut 20 has a positioning portion 21 extending in the axial direction and a notch 22 that opens toward the radial direction. The positioning portion 21 contacts and fits with the inner wall of the valve cavity, and the notch 22 surrounds the first connecting pipe. The outer side of the port 50; the valve core assembly 30 is movably installed on the nut 20 and is threaded with the nut 20. The valve core assembly 30 controls the on-off state of the electronic expansion valve by changing the positional relationship with the valve seat assembly 10; the rotor The assembly 40 is rotatably arranged relative to the valve seat assembly 10, and is connected to the valve core assembly 30. The rotor assembly 40 drives the valve core assembly 30 to rotate synchronously. The valve core assembly 30 and the valve port provided on the valve seat assembly 10 can be sealed. Blocking or controlling the opening degree of the valve, so as to realize the on-off state of the electronic expansion valve.

In this embodiment, the nut 20 is provided with a positioning portion 21 and a notch 22, wherein the positioning portion 21 extends in the axial direction so as to be able to guide and locate the axial position of the nut 20 when the nut 20 is installed on the valve seat assembly 10 , So as to ensure the coaxiality of the installation of the nut 20, and the notch 22 is open in the radial direction, thereby guiding and positioning the circumferential position of the nut 20, and ensuring the accuracy of the circumferential installation of the nut 20. The above arrangement method can reliably guide and position the nut 20 in the axial and circumferential directions when the nut 20 is installed through the positioning part 21 and the notch 22, ensuring the verticality and coaxiality of the nut 20 installation, and ensuring that the nut 20 is in the center of the product. Position, so as to achieve the effect of ensuring the installation accuracy of the nut 20, and because the nut 20 directly matches the valve seat assembly 10 and the first connecting pipe 50, there is no need to pass through a guide sleeve, so there is no need to set a guide sleeve, thereby reducing zero The number of parts simplifies the structure of the electronic expansion valve and reduces the cost.

In this embodiment, at least a part of the first connecting pipe 50 extends into the notch 22. Since the first connecting tube 50 is generally a round tube, the notch 22 is semicircular, so as to better match the shape of the first connecting tube 50. When the nut 20 is installed in place, a part of the first connecting tube 50 will be It is accommodated in the notch 22 so that the nut 20 cannot be rotated in the circumferential direction.

Optionally, the electronic expansion valve further includes a pressure plate. The outer wall of the nut 20 is formed with a stepped surface. After the pressure plate is pressed on the stepped surface, the outer edge of the pressure plate is connected to the inner wall of the valve seat assembly 10, thereby completely fixing the nut 20 In the valve cavity, at this time, the nut 20 cannot move axially due to the compression of the pressure plate, so that the notch 22 is always matched with the first connecting pipe 50, thereby ensuring the anti-rotation effect.

The nut 20 of this embodiment includes a plurality of segments with different diameters along its axial direction, and the outer wall surface with the largest diameter is the positioning portion 21.

In this embodiment, the nut 20 further includes a guide section and a threaded section 23 that are connected in sequence. The valve core assembly 30 passes through the guide section and the threaded section 23. The valve core assembly 30 and the threaded section 23 are threadedly matched. When the rotor assembly When 40 drives the spool assembly 30 to rotate, the threaded fit will cause the spool assembly 30 to rotate and generate axial movement at the same time, so that the electronic expansion valve can be switched between on and off states. Since this embodiment is not provided with a guide sleeve, the component that guides the valve core assembly 30 is the nut 20, and more specifically, the guide section guides the movement of the valve core assembly 30 and avoids the movement of the valve core assembly 30. The tilt occurs to ensure that the valve core assembly 30 moves in the axial direction.

In this embodiment, the valve core assembly 30 includes a screw 31, a valve needle 32, and a spring 33, wherein the outer wall of the screw 31 has a thread so as to cooperate with the thread section 23 of the nut 20, and the valve needle 32 is penetrated on the screw 31, The valve needle 32 cooperates with the valve seat assembly 10 to control the on-off state of the electronic expansion valve. The spring 33 is arranged in the screw 31 and sleeved outside the valve needle 32. Both ends of the spring 33 abut the screw 31 and the valve needle 32 respectively. As a result, the screw 31 and the valve needle 32 move synchronously. Since there are two components, the screw 31 and the valve needle 32, the guide section is also provided with two sections, including a first guide section 24 and a second guide section 25. The screw 31 cooperates with the first guide section 24 to ensure that the screw 31 Stability of operation, the valve needle 32 cooperates with the second guide section 25 to prevent the valve needle 32 from deflecting due to the influence of the air flow, so that the movement of the screw 31 and the valve needle 32 can be respectively guided to ensure the overall integrity of the valve core assembly 30 movement.

As shown in Figures 1 and 2, along the axial direction of the electronic expansion valve, for the screw 31, the threaded section 23 of the screw 31 of this embodiment is located on the side of the screw 31 close to one end of the first connecting pipe 50, which is shown in Figure 1. In this way, no matter whether the electronic expansion valve is open or closed, the thread on the screw 31 will always be matched with the thread section 23 on the nut 20, so that the thread will not come out and ensure the reliability of the overall mechanism. With this arrangement, the screw 31 can only be far away from the one end side of the first connecting pipe 50, that is, the upper end side shown in FIG. 1 cooperates with the nut 20 to guide, so the first guide section 24 and the threaded section 23 are far away from the first connecting pipe 50. Connect one end, as shown in Figure 2. For the valve needle 32, the valve needle 32 is far away from one end side of the first connecting tube 50, that is, the upper end side shown in FIG. The side surface of the valve needle 32 close to the first connecting pipe 50 is guided by the nut 20, that is, the lower end side shown in FIG. 1, and preferably the side surface of the segment of the valve needle 32 just after passing through the screw 31 is guided by the nut 20, so the first The second guide section 25 is connected to the end of the threaded section 23 close to the first connecting pipe 50, as shown in FIG. 2. In short, the above arrangement is that the first guide section 24 and the second guide section 25 are located at both ends of the threaded section 23 respectively. Of course, if part or all of the structure between the screw 31, the valve needle 32 and the nut 20 changes, the specific positions of the first guide section 24, the second guide section 25 and the threaded section 23 can also be changed accordingly, as long as it can It is only necessary to ensure that the first guide section 24 and the second guide section 25 realize the guiding function of the valve core assembly 30, and the threaded section 23 realizes the threaded fit between the nut 20 and the valve core assembly 30.

In this embodiment, the nut 20 further includes a third guide section 26. The third guide section 26 is located at the end of the second guide section 25 away from the threaded section 23. The third guide section 26 cooperates with the valve seat assembly 10, and the valve seat assembly 10 A part of it extends into the third guide section 26 and contacts and cooperates with the inner wall of the third guide section 26.

Specifically, the valve seat assembly 10 of this embodiment includes a lower valve seat, an upper sleeve, and a valve seat core. The lower valve seat and the upper sleeve are connected together to form a valve cavity. The side and bottom surfaces of the lower valve seat are respectively provided with a through hole, wherein the through hole on the side is mated and connected with the first connecting pipe 50, and the through hole on the bottom is connected with the second The tube 60 is mated and connected. A valve core seat is provided at the through hole on the bottom surface. The valve core seat is in the shape of a sleeve. A part of the third guide section 26 is sleeved on the outside of the valve core seat, so that the nut 20 is matched with the valve seat core. Install to ensure installation accuracy. The valve needle 32 of the valve core assembly 30 also realizes the switching of the on-off state of the electronic expansion valve through cooperation with the valve core seat. The axial movement of the valve core assembly 30 driven by the rotor assembly 40 will change the valve needle 32 and the valve core seat. The distance between the center holes on the valve core seat changes the opening of the center hole, and thus the flow rate is adjusted.

In this embodiment, the nut 20 has a radially opened through hole 27 on one side surface close to the first connecting pipe 50, and the through hole 27 is in communication with the first connecting pipe 50.

Specifically, the through hole 27 is opened on the side of the third guide section 26, and the through hole 27 connects the valve cavity with the center hole of the third guide section 26, thereby forming a passage for fluid to pass through, and the gas-liquid fluid flows from the first connecting pipe. 50 enters the valve cavity and flows out of the second connecting pipe 60 through the through hole 27 through the central hole of the third guide section 26 and the central hole of the valve core seat in turn. In addition, the through hole 27 of this embodiment is facing the first connecting pipe 50, so that the fluid entering the valve cavity from the first connecting pipe 50 will flow out through the through hole 27 as soon as possible.

Preferably, the flow area of the through hole 27 is larger than the area of the valve port on the valve seat assembly 10.

Example two

The difference from the first embodiment is that the through hole 27 on the nut 20 and the first connecting pipe 50 are circumferentially displaced.

As shown in Figures 3 to 6, the through hole 27 of this embodiment is not directly facing the first connecting pipe 50, but is circumferentially displaced from the first connecting pipe 50, that is, the fluid entering the valve cavity from the first connecting pipe 50 It cannot pass through the through hole 27 directly, but needs to move at least a short distance in the circumferential direction in the valve cavity to pass through the through hole 27, and there are also multiple through holes 27, for example, there are four in FIGS. 4 and 5. Through holes 27, the through holes 27 are arranged at intervals along the circumferential direction of the nut 20, and the section of the nut 20 between the through holes 27 faces the first connecting pipe 50. Preferably, the four through holes 27 are separated by 90 degrees. Set, and along the radial direction of the nut 20, an angle of 45 degrees or 135 degrees is formed between the axis of the through hole 27 and the axis of the first connecting pipe 50, so that the air flow can be uniformly taken in from 4 directions, and the air flow is more stable , To avoid noise.

Preferably, the through hole 27 has an arch shape.

It should be noted that multiple in the above-mentioned embodiment refers to at least two.

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

1. The problem of poor installation accuracy of the electronic expansion valve in the prior art is solved;

2. The positioning part and the notch part can reliably guide and position the nut in the axial and circumferential directions during installation, ensuring the verticality and coaxiality of the nut installation;

3. There is no need to set a guide sleeve, thereby reducing the number of parts and simplifying the structure of the electronic expansion valve;

4. The guiding section guides the movement of the spool assembly to avoid tilting of the movement of the spool assembly and ensure that the spool assembly moves in the axial direction;

5. The third guide section realizes the installation of the nut and the valve seat core to ensure the installation accuracy;

6. The circumferentially staggered arrangement between the through hole and the first connecting pipe allows the airflow to be evenly airflowed, the airflow is more stable, and noise is avoided.

Obviously, the embodiments described above are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

An electronic expansion valve, characterized in that it comprises:

A valve seat assembly (10), the valve seat assembly (10) having a valve cavity communicating with the first connecting pipe (50);

A nut (20), the nut (20) is arranged in the valve cavity, and the outer wall of the nut (20) has a positioning portion (21) extending in the axial direction and a notch (22) opening toward the radial direction, The positioning portion (21) is in contact with the inner wall of the valve cavity, and the notch portion (22) surrounds the outside of the port of the first connecting pipe (50);

The spool assembly (30), the spool assembly (30) is movably installed on the nut (20), and is threadedly fitted with the nut (20), and the spool assembly (30) is changed to the nut (20). The positional relationship between the valve seat components (10) controls the on-off state of the electronic expansion valve;

The rotor assembly (40), the rotor assembly (40) is rotatably arranged relative to the valve seat assembly (10), and is connected with the valve core assembly (30), and the rotor assembly (40) drives the valve The core assembly (30) rotates synchronously and changes the on-off state of the electronic expansion valve.
The electronic expansion valve according to claim 1, wherein at least a part of the first connecting pipe (50) extends into the notch (22).
The electronic expansion valve according to claim 1, characterized in that, the nut (20) further comprises a guide section and a threaded section (23) connected in sequence, and the valve core assembly (30) penetrates the guide section (23). And the threaded section (23), and are threadedly matched with the threaded section (23), and the guide section guides the axial movement of the valve core assembly (30).
The electronic expansion valve according to claim 3, wherein the valve core assembly (30) comprises a screw (31) and a valve needle (32), and the screw (31) is matched with the threaded section (23) , The valve needle (32) cooperates with the valve seat assembly (10) to control the on-off state of the electronic expansion valve, and the guide section includes a first guide section (24) and a second guide section (25), The screw (31) is matched with the first guide section (24), and the valve needle (32) is matched with the second guide section (25).
The electronic expansion valve according to claim 4, wherein the first guide section (24) and the second guide section (25) are respectively located at two ends of the threaded section (23).
The electronic expansion valve according to claim 1, wherein the nut (20) further comprises a third guide section (26), and the third guide section (26) cooperates with the valve seat assembly (10) A part of the valve seat assembly (10) extends into the third guide section (26) and contacts and cooperates with the inner wall of the third guide section (26).
The electronic expansion valve according to claim 1, wherein the nut (20) has a radially opened through hole (27) on one side of the nut (20) close to the first connecting pipe (50), and the through hole (27) Connect with the first connecting pipe (50).
The electronic expansion valve according to claim 7, characterized in that, the through holes (27) are multiple and are arranged at intervals along the circumferential direction of the nut (20), and the through holes (27) are connected to the The first connecting pipe (50) is circumferentially displaced.
The electronic expansion valve according to claim 7, characterized in that the flow area of the through hole (27) is larger than the area of the valve port on the valve seat assembly (10).
The electronic expansion valve according to claim 7, characterized in that the through hole (27) is arched.