Magnetic rotor and electronic expansion valve with same
By designing the transition surface in the magnetic rotor as the first arc surface and the second arc surface to avoid sharp angle contact, the problem of stress concentration of magnetic rotor in the prior art is solved, and higher durability and stability are achieved.
Patent Information
- Application Number
- CN202421796803.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The magnetic rotor in the existing electronic expansion valves is stress-concentrated due to the step structure at the change of wall thickness, which is prone to cracking. Existing solutions such as tilt chamfer transitions still have stress-concentration problems.
A magnetic rotor is designed, and its transition surface includes a first arc surface and a second arc surface, the first arc surface is tangent to the first wall, and the second arc surface is tangent to the second wall, avoiding sharp corners at the contact between the transition surface and the wall surface, and reducing stress concentration.
This design significantly reduces the stress concentration caused by the staggered wall thickness setting of the magnetic rotor, and improves the durability and stability of the magnetic rotor.
Smart Images
Figure CN222824597U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic expansion valves, and in particular to a magnetic rotor and an electronic expansion valve having the same. Background Art
[0002] The electronic expansion valve is provided with a magnetic rotor, a threaded sleeve and a valve core assembly, wherein one end of the valve core assembly away from the valve port is connected to the magnetic rotor, and the valve core assembly is threadedly connected to the threaded sleeve. As the magnetic rotor rotates, the magnetic rotor drives the valve core assembly to approach or move away from the valve port along the axial direction of the electronic expansion valve, thereby enabling the valve core assembly to close or open the valve port.
[0003] The wall thickness of the magnetic rotor where it is used to connect the valve core assembly is usually greater than the wall thickness at other locations, and a step structure will be formed at the location where the wall thickness changes. Due to the large stress concentration at the sharp corners of the step structure, the magnetic rotor is prone to cracking. A common solution is to use an inclined chamfer transition at the location where the wall thickness of the magnetic rotor changes. Since the two ends of the chamfer still form a sharp angle with the wall of the magnetic rotor, although the angle of the sharp angle is reduced, stress concentration still exists. Utility Model Content
[0004] Based on this, it is necessary to provide a magnetic rotor and an electronic expansion valve having the same which can effectively reduce stress concentration.
[0005] A magnetic rotor comprises a first wall, a second wall and a transition surface. The first wall and the second wall are staggered along the radial direction of the magnetic rotor. The transition surface is used to connect the first wall and the second wall. The transition surface comprises a first arc surface and a second arc surface, wherein the first arc surface is tangent to the first wall and the second arc surface is tangent to the second wall.
[0006] In one embodiment, the first arc surface is tangent to the second arc surface.
[0007] In one embodiment, a tangent line between the first arc surface and the second arc surface extends along the radial direction of the magnetic rotor.
[0008] In one embodiment, the radius of the first arc surface is defined as R 1 The radius of the second arc surface is R 2 , the distance between the first wall and the second wall along the radial direction of the magnetic rotor is H, where R 1 =R 2 =H / 2.
[0009] In one embodiment, the transition surface further includes a connecting plane, the connecting plane connects the first arc surface and the second arc surface, and opposite ends of the connecting plane are tangent to the first arc surface and the second arc surface respectively.
[0010] In one of the embodiments, the connection plane extends along the radial direction of the magnetic rotor; or, the connection plane is inclined relative to the radial direction of the magnetic rotor.
[0011] In one embodiment, the magnetic rotor further comprises a third wall and a fourth wall, the plane where the third wall is located is perpendicular to the plane where the fourth wall is located, and a rounded corner is provided at the junction of the third wall and the fourth wall.
[0012] The present application also provides an electronic expansion valve, which includes a valve body assembly, a valve core assembly, a threaded sleeve, and a magnetic rotor as described in any one of the above embodiments, wherein the valve body assembly has a valve port, the threaded sleeve is fixedly connected to the valve body assembly, an end of the valve core assembly away from the valve port is connected to the magnetic rotor, and the valve core assembly is threadedly connected to the threaded sleeve. As the magnetic rotor rotates, the magnetic rotor drives the valve core assembly to approach or move away from the valve port along the axial direction of the electronic expansion valve.
[0013] In one embodiment, the valve body assembly includes a valve seat portion and an outer shell, a chamber is formed between the valve seat portion and the outer shell, and the magnetic rotor is movably disposed in the chamber.
[0014] In one embodiment, the thickness of the magnetic rotor at the first wall is greater than the thickness at the second wall, and the electronic expansion valve also includes a connecting plate, which is fixedly connected to the first wall along the circumferential direction, and one end of the valve core assembly away from the valve port is passed through the connecting plate and fixedly connected to the magnetic rotor through the connecting plate.
[0015] Compared with the prior art, the magnetic rotor provided by the present application has a transition surface for transitionally connecting the first wall and the second wall, and by setting the first arc surface to be tangent to the first wall and the second arc surface to be tangent to the second wall, no sharp angle is formed at the connection between the transition surface and the first wall and at the connection with the second wall, thereby significantly reducing the stress concentration caused by the first wall and the second wall being staggered along the radial direction of the magnetic rotor. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0017] Figure 1 A cross-sectional view of the magnetic rotor along the axial direction in the first embodiment provided in the present application;
[0018] Figure 2 for Figure 1 An enlarged schematic diagram at A;
[0019] Figure 3 This is an enlarged schematic diagram of the magnetic rotor at position A in the second embodiment provided in the present application;
[0020] Figure 4 This is an enlarged schematic diagram of the magnetic rotor at position A in the third embodiment provided in the present application;
[0021] Figure 5 This is an enlarged schematic diagram of the magnetic rotor at position A in the fourth embodiment provided in the present application;
[0022] Figure 6 A cross-sectional view of the electronic expansion valve provided in this application.
[0023] Figure numerals: 100, electronic expansion valve; 10, magnetic rotor; 11, first wall; 12, second wall; 13, transition surface; 131, first arc surface; 132, second arc surface; 133, connecting plane; 14, third wall; 15, fourth wall; 17, fillet; 20, valve body assembly; 21, valve seat portion; 22, outer shell; 23, chamber; 24, valve port; 30, valve core assembly; 31, screw; 32, valve needle; 50, threaded sleeve; 60, connecting plate. DETAILED DESCRIPTION
[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0025] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.
[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0028] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.
[0029] See also Figure 1 and Figure 2 The present application provides a magnetic rotor 10, which has a first wall 11, a second wall 12 and a transition surface 13. The first wall 11 and the second wall 12 are staggered along the radial direction of the magnetic rotor 10, and the transition surface 13 is used to connect the first wall 11 and the second wall 12; and the transition surface 13 includes a first arc surface 131 and a second arc surface 132, wherein the first arc surface 131 is tangent to the first wall 11, and the second arc surface 132 is tangent to the second wall 12. It can be understood that the transition surface 13 is used to transitionally connect the first wall 11 and the second wall 12, and by setting the first arc surface 131 to be tangent to the first wall 11 and the second arc surface 132 to be tangent to the second wall 12, the connection between the transition surface 13 and the first wall 11 and the connection between the transition surface 13 and the second wall 12 will not form a sharp angle, so that the stress concentration caused by the staggered arrangement of the first wall 11 and the second wall 12 along the radial direction of the magnetic rotor 10 can be significantly reduced.
[0030] Exemplarily, in one embodiment, the magnetic rotor 10 is barrel-shaped, the first wall 11 and the second wall 12 are configured as inner walls of the barrel-shaped magnetic rotor 10 , and the thickness of the magnetic rotor 10 at the first wall 11 is greater than the thickness at the second wall 12 .
[0031] The structure of the transition surface 13 will be described below.
[0032] See also Figure 2 and Figure 3In some embodiments, the first arc surface 131 is tangent to the second arc surface 132. In this way, the first arc surface 131 is continuous with the second arc surface 132, and a sharp angle is not formed at the connection between the first arc surface 131 and the second arc surface 132, which is conducive to further reducing the stress concentration at the connection between the first wall 11 and the second wall 12.
[0033] Optionally, in one embodiment, if Figure 2 As shown, the tangent line between the first arc surface 131 and the second arc surface 132 extends along the radial direction of the magnetic rotor 10. That is, the first arc surface 131 is horizontally tangent to the second arc surface 132. It can be understood that in this embodiment, the angle of the first arc surface 131 is defined as α 1 The angle of the second arc surface 132 is α 2 , where α 1 =α 2 =90°, and the radius of the first arc surface 131 is defined as R 1 The radius of the second arc surface 132 is R 2 , the distance between the first wall 11 and the second wall 12 along the radial direction of the magnetic rotor 10 is H, wherein R 1 +R 2 =H.
[0034] Furthermore, R 1 =R 2 =H / 2. It is understandable that R 1 The larger the value of / H is, the smaller the stress concentration on the first arc surface 131 is. 2 The larger the value of / H is, the smaller the stress concentration at the second arc surface 132 is. Therefore, by setting R 1 =R 2 =H / 2, while reducing the overall stress concentration of the transition surface 13, the stress distribution at the first arc surface 131 and the second arc surface 132 are closer, so that the stress distribution at each position of the transition surface 13 is more uniform.
[0035] Of course, in other embodiments, such as Figure 3 As shown, the tangent line between the first arc surface 131 and the second arc surface 132 can also be configured to be inclined relative to the radial direction of the magnetic rotor 10. That is, the first arc surface 131 and the second arc surface 132 are inclined and tangent to each other.
[0036] In some embodiments, such as Figure 4 and Figure 5As shown, the transition surface 13 further includes a connecting plane 133, the connecting plane 133 connects the first arc surface 131 and the second arc surface 132, and the two opposite ends of the connecting plane 133 are respectively tangent to the first arc surface 131 and the second arc surface 132. In this way, although the first arc surface 131 and the second arc surface 132 are not continuous, by providing the connecting plane 133, and the two opposite ends of the connecting plane 133 are respectively tangent to the first arc surface 131 and the second arc surface 132, no sharp corners are formed on the transition surface 13, which is conducive to further reducing the stress concentration at the connection between the first wall 11 and the second wall 12.
[0037] Optionally, in one embodiment, if Figure 3 As shown, the connecting plane 133 extends along the radial direction of the magnetic rotor 10. That is, in this embodiment, the angle of the first arc surface 131 is defined as α 1 The angle of the second arc surface 132 is α 2 , where α 1 =α 2 =90°; the radius of the first arc surface 131 is defined as R 1 The radius of the second arc surface 132 is R 2 , the distance between the first wall 11 and the second wall 12 along the radial direction of the magnetic rotor 10 is H, and the extension length of the connecting plane 133 along the radial direction of the magnetic rotor 10 is D, wherein R 1 +R 2 +D=H.
[0038] Or, in another embodiment, Figure 4 As shown, the connecting plane 133 is arranged obliquely with respect to the radial direction of the magnetic rotor 10 .
[0039] Please continue reading Figure 1 The magnetic rotor 10 further comprises a third wall 14 and a fourth wall 15, the plane where the third wall 14 is located is perpendicular to the plane where the fourth wall 15 is located, and a rounded corner 17 is provided at the junction of the third wall 14 and the fourth wall 15. In this way, the magnetic rotor 10 does not form a sharp corner at the corner between the third wall 14 and the fourth wall 15, thereby avoiding stress concentration at the corner of the magnetic rotor 10.
[0040] Exemplarily, in one embodiment, the third wall 14 is configured as the outer peripheral wall of the magnetic rotor 10, and the fourth wall 15 is configured as one end surface of the magnetic rotor 10 in the axial direction. Alternatively, in one embodiment, the third wall 14 is configured as the inner peripheral wall of the magnetic rotor 10, and the fourth wall 15 is configured as one end surface of the magnetic rotor 10 in the axial direction.
[0041] See also Figure 6The present application also provides an electronic expansion valve 100, which includes a valve body assembly 20, a valve core assembly 30, a threaded sleeve 50, and the magnetic rotor 10 described in any one of the above embodiments. The valve body assembly 20 has a valve port 24, the threaded sleeve 50 is fixedly connected to the valve body assembly 20, the end of the valve core assembly 30 away from the valve port 24 is connected to the magnetic rotor 10, and the valve core assembly 30 is threadedly connected to the threaded sleeve 50. As the magnetic rotor 10 rotates, the magnetic rotor 10 drives the valve core assembly 30 to approach or move away from the valve port 24 along the axial direction of the electronic expansion valve 100.
[0042] The valve core assembly 30 includes a screw rod 31 and a valve needle 32 connected to each other. The screw rod 31 is connected to the valve core assembly 30 and is threadedly connected to the threaded sleeve 50 . The valve needle 32 is used to open or close the valve port 24 .
[0043] The valve body assembly 20 includes a valve seat portion 21 and an outer shell 22 . A chamber 23 is formed between the valve seat portion 21 and the outer shell 22 . The magnetic rotor 10 is movably disposed in the chamber 23 .
[0044] The thickness of the magnetic rotor 10 at the first wall 11 is greater than the thickness at the second wall 12. The electronic expansion valve 100 also includes a connecting plate 60, which is fixedly connected to the first wall 11 along the circumferential direction. The screw 31 of the valve core assembly 30 is passed through the connecting plate 60 and is fixedly connected to the magnetic rotor 10 through the connecting plate 60.
[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0046] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.
Claims
1. A magnetic rotor, characterized in that: The magnetic rotor comprises a first wall (11), a second wall (12) and a transition surface (13); along the radial direction of the magnetic rotor, the first wall (11) and the second wall (12) are staggered, and the transition surface (13) is used to connect the first wall (11) and the second wall (12); Furthermore, the transition surface (13) comprises a first arc surface (131) and a second arc surface (132), wherein the first arc surface (131) is tangent to the first wall (11), and the second arc surface (132) is tangent to the second wall (12).
2. The magnetic rotor according to claim 1, characterized in that The first arc surface (131) is tangent to the second arc surface (132).
3. The magnetic rotor according to claim 2, characterized in that A tangent line between the first arc surface (131) and the second arc surface (132) extends along the radial direction of the magnetic rotor.
4. The magnetic rotor according to claim 2, characterized in that The radius of the first arc surface (131) is defined as R1, the radius of the second arc surface (132) is defined as R2, and the distance between the first wall (11) and the second wall (12) along the radial direction of the magnetic rotor is defined as H, wherein R1=R2=H / 2.
5. The magnetic rotor according to claim 1, characterized in that The transition surface (13) further comprises a connecting plane (133), wherein the connecting plane (133) connects the first arc surface (131) and the second arc surface (132), and opposite ends of the connecting plane (133) are respectively tangent to the first arc surface (131) and the second arc surface (132).
6. The magnetic rotor according to claim 5, characterized in that The connection plane (133) extends along the radial direction of the magnetic rotor; Alternatively, the connection plane (133) is arranged to be inclined relative to the radial direction of the magnetic rotor.
7. The magnetic rotor according to claim 1, characterized in that The magnetic rotor also has a third wall (14) and a fourth wall (15), the plane where the third wall (14) is located is perpendicular to the plane where the fourth wall (15) is located, and a rounded corner (17) is provided at the junction of the third wall (14) and the fourth wall (15).
8. An electronic expansion valve, characterized in that: The electronic expansion valve comprises a valve body assembly (20), a valve core assembly (30), a threaded sleeve (50), and a magnetic rotor according to any one of claims 1 to 6, wherein the valve body assembly (20) has a valve port (24), the threaded sleeve (50) is fixedly connected to the valve body assembly (20), an end of the valve core assembly (30) away from the valve port (24) is connected to the magnetic rotor (10), and the valve core assembly (30) is threadedly connected to the threaded sleeve (50); As the magnetic rotor (10) rotates, the magnetic rotor (10) drives the valve core assembly (30) to move closer to or farther from the valve port (24) along the axial direction of the electronic expansion valve.
9. The electronic expansion valve according to claim 8, characterized in that: The valve body assembly (20) comprises a valve seat portion (21) and an outer shell (22), a chamber (23) is formed between the valve seat portion (21) and the outer shell (22), and the magnetic rotor (10) is movably disposed in the chamber (23).
10. The electronic expansion valve according to claim 8, characterized in that: The thickness of the magnetic rotor (10) at the first wall (11) is greater than the thickness at the second wall (12). The electronic expansion valve further comprises a connecting plate (60), the connecting plate (60) being fixedly connected to the first wall (11) along the circumferential direction, and an end of the valve core assembly (30) away from the valve port (24) is passed through the connecting plate (60) and fixedly connected to the magnetic rotor (10) via the connecting plate (60).