Electronic expansion valve

Abstract

The utility model relates to the technical field of fluid control components, in particular to an electronic expansion valve, which comprises a valve needle component, a valve rod component and a valve rod component, the outer side of the middle-upper part of the valve needle part is sleeved with a nut assembly; a rotor part is arranged on the outer side of the nut assembly, and a certain gap is formed between the nut assembly and the rotor part; the valve core part is positioned at the bottom end of the valve needle part; wherein the valve needle part comprises a screw rod, a spring sleeve, a pre-tightening spring and a valve needle; the screw rod is in clearance fit with the spring sleeve, the spring sleeve is in interference fit with the valve needle and is connected with the valve needle through laser welding, and the pre-tightening spring is arranged in the spring sleeve and partially sleeves the valve needle. The utility model has the beneficial effects that the upper end and the lower end are limited after the limiting spring and the nut assembly are assembled, the reliability is higher, the structure is simple, and the cost is reduced; and the rotor component is directly and integrally molded with the magnetic ring convex ribs during injection molding, so that the production cost is reduced, the magnetic ring convex ribs have no inclination risk, and the reliability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control components, in particular to an electronic expansion valve. Background Art

[0002] The electronic expansion valve is a throttling device that changes the opening of the electronic expansion valve by driving the rotor component to rotate through coil excitation, thereby adjusting the flow of refrigerant. The existing electronic expansion valve body includes a sleeve, a rotor component, a nut component, a valve needle component and a valve core component. The rotor component and the valve needle component are connected by laser welding, the rotor component and the nut component are threaded, and the nut component and the valve core component are fixed by laser welding. The rotation of the rotor component will drive the valve needle component to move up and down, thereby changing the gap between the valve needle component and the valve core component, so as to achieve the purpose of adjusting the opening of the electronic expansion valve.

[0003] The prior art has the following defects: the lower end of the limit spring requires three bends, the structure is complex, the dimensional accuracy is difficult to control, and the production cost is high; after the limit spring and the nut component are assembled, there is no limit on the upper end of the limit spring, and when the stop spring rotates to collide with the upper end of the limit spring, there is a risk of deformation of the spring at the upper end of the limit spring; one end of the guide plate on the rotor component is laser welded to the rotor connecting plate, and the guide plate is arranged on the lower part of the rotor connecting plate and the stop spring needs to be moved to realize the stopping function. The guide plate is arranged on the lower part of the rotor connecting plate and is long and is not restricted and fixed, so it is easy to tilt. When the tilt is more serious, it cannot touch the stop spring, which causes the stop failure; the valve needle component includes 6 parts including a screw, a bushing, a pressure sleeve, a preload spring, a spring seat and a valve needle. The number of parts is relatively large and the structure is relatively complex, which leads to high production costs and is not conducive to production management. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an electronic expansion valve to effectively solve the problems in the background technology.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an electronic expansion valve, comprising:

[0006] The valve needle component located in the center of the electronic expansion valve;

[0007] A nut assembly is sleeved on the outer side of the upper middle portion of the valve needle component;

[0008] A rotor component is disposed on the outer side of the nut component, and a certain gap is formed between the nut component and the rotor component;

[0009] A valve core component, located at the bottom end of the valve needle component;

[0010] Among them, the valve needle component includes a screw, a spring sleeve, a pre-load spring and a valve needle; the screw and the spring sleeve are clearance-fitted, the spring sleeve and the valve needle are interference-fitted and connected by laser welding, and the pre-load spring is arranged in the spring sleeve and partially mounted on the valve needle.

[0011] Furthermore, a limit spring is arranged outside the nut assembly, and the upper and lower ends of the limit spring are set to be bent at one point, the upper end is bent inwardly, and the lower end is bent vertically.

[0012] Furthermore, the nut assembly is formed by injection molding with the nut connecting plate as an insert; the nut connecting plate is a metal part.

[0013] Furthermore, the nut assembly has an injection molding groove at its lower end and an oblique injection molding groove at its upper end, the lower end of the limit spring is placed in the injection molding groove, and the upper end of the limit spring is buckled in the oblique injection molding groove.

[0014] Furthermore, the rotor component is formed by injection molding with the magnetic ring connecting plate as an insert, and the magnetic ring connecting plate is a metal part;

[0015] The rotor component is provided with trapezoidal long strip magnetic ring ribs, and the magnetic ring ribs are integrally formed by injection molding.

[0016] Furthermore, a groove matching with the end of the valve needle is provided inside the valve core component.

[0017] Furthermore, a stop spring is arranged at the lower part of the limit spring and is arranged alternately with the limit spring.

[0018] Furthermore, a sleeve is provided on the outer side of the rotor component.

[0019] The beneficial effects of the utility model are that the limit spring has a simple structure and can reduce the cost of parts. After the limit spring and the nut assembly are assembled, both the upper and lower ends will be limited, which is more reliable than the lower end limiting method of the limit spring in the prior art; the rotor component is directly integrally formed with the magnetic ring rib during injection molding, which saves one part and reduces the production cost, and the magnetic ring rib has no risk of tilting, and has higher reliability; the valve needle component contains 4 parts, which saves 2 parts and reduces the assembly cost and material cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the structure of the electronic expansion valve in the embodiment of the utility model;

[0022] Figure 2 This is a structural schematic diagram of a nut component in an embodiment of the utility model;

[0023] Figure 3 It is a cross-sectional view of the nut component in the embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the nut assembly in the embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the limit spring in the embodiment of the utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the valve needle component in the embodiment of the utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the rotor component in the embodiment of the utility model;

[0028] Figure 8 It is a cross-sectional view of the rotor component in the embodiment of the utility model.

[0029] Figure numerals: 1. Valve needle component; 11. Screw; 12. Spring sleeve; 13. Preload spring; 14. Valve needle; 2. Nut assembly; 21. Nut connecting plate; 22. Injection molding groove; 23. Angled injection molding groove; 3. Rotor component; 31. Magnetic ring connecting plate; 32. Magnetic ring rib; 4. Valve core component; 5. Limit spring; 6. Stop spring; 7. Sleeve. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] like Figures 1 to 8 The electronic expansion valve shown comprises: a valve needle component 1 located at the center of the electronic expansion valve; a nut assembly 2 is sleeved on the outer side of the upper middle part of the valve needle component 1; a rotor component 3 is provided on the outer side of the nut assembly 2, and a certain gap is provided between the nut assembly 2 and the rotor component 3; a valve core component 4 is located at the bottom end of the valve needle component 1; wherein the valve needle component 1 comprises a screw rod 11, a spring sleeve 12, a preload spring 13 and a valve needle 14; the screw rod 11 and the spring sleeve 12 are clearance-fitted, the spring sleeve 12 and the valve needle 14 are interference-fitted and connected by laser welding, and the preload spring 13 is arranged in the spring sleeve 12 and partially sleeved on the valve needle 14.

[0034] The implementation process of the utility model is that the rotor component 3 is provided with a magnetic ring, a magnetic ring connecting plate 31 and a guide plate. When the rotor component 3 rotates, the guide plate will drive the stop spring 6 to rotate together. The stop spring 6 rotates along the spiral track of the limit spring 7. When the stop spring 6 rotates to the lower end of the track of the limit spring 7, it will be blocked from rotating, so that the rotor component 3 and the valve needle component 1 will also be prevented from moving downward, so that the stroke of the electronic expansion valve rotor component 3 can be limited to control the opening degree of the electronic expansion valve.

[0035] In the utility model, a limit spring 5 is arranged on the outside of the nut assembly 2, and the upper and lower ends of the limit spring 5 are set to be bent, the upper end is bent inwardly, and the lower end is bent vertically. The bending design of the upper and lower ends of the limit spring 5 makes the connection between the limit spring 5 and the nut assembly 2 more stable. The inward bending of the upper end can enhance the buckling force with the angled injection molding groove 22, and the vertical bending of the lower end can be stably placed in the injection molding groove 23, thereby preventing the limit spring 6 from loosening or falling off during use, and improving the stability of the entire structure; the nut assembly 2 is formed by injection molding with the nut connecting plate 21 as an insert. During the manufacturing process, the nut connecting plate 21 can be tightly combined with the plastic part without additional fixing steps; the nut connecting plate 21 is a metal part, the lower end of the nut assembly 2 is provided with an injection molding groove 22, and the upper end is provided with an angled injection molding groove 23, the lower end of the limit spring 5 is placed in the injection molding groove 22, and the upper end of the limit spring 5 is buckled in the angled injection molding groove 23.

[0036] In this solution, the rotor component 3 is formed by injection molding with the magnetic ring connecting plate 31 as an insert. The magnetic ring connecting plate 31 is a metal part. The rotor component 3 is formed by injection molding with the magnetic ring connecting plate 31 as an insert, which ensures the close combination between metal and plastic. The magnetic ring connecting plate 31, as a metal part, has high mechanical strength and stability, can enhance the overall structural strength of the rotor component, and improve its anti-deformation and anti-fatigue ability during operation; the rotor component 3 is provided with a trapezoidal strip-shaped magnetic ring rib 32, which is integrally formed by injection molding, and the magnetic ring rib 32 adopts a trapezoidal strip The shaped design is combined with the rotor component 3 through injection molding, which not only simplifies the manufacturing process and improves production efficiency, but also ensures that the connection between the magnetic ring rib and the rotor component is firm and reliable. Injection molding can also eliminate the gap and looseness problems that may exist in the traditional assembly method, and further enhance the stability and reliability of the structure. The magnetic ring rib 32 and the rotor component 3 are manufactured by injection molding, which can reduce the number of parts and assembly processes, thereby reducing manufacturing costs. At the same time, the integrated structure also reduces the disassembly and assembly work during maintenance, and improves the convenience of maintenance.

[0037] In a preferred embodiment of the utility model, a groove is provided inside the valve core component 4 which matches with the end of the valve needle 14. The close fit between the groove of the valve core component 4 and the end of the valve needle 14 ensures that the connection between them is tight and seamless, effectively reducing the leakage of refrigerant or other fluids between the valve core component 4 and the valve needle 14, thereby improving the sealing performance of the electronic expansion valve.

[0038] At the lower part of the limit spring 5, a stop spring 6 is arranged alternately with the limit spring 5. The stop spring 6 is arranged alternately with the limit spring 5, which can provide additional support and stability for the entire structure, ensuring that when subjected to external force or vibration, the structure can more stably maintain its original state and reduce loosening or displacement caused by vibration or impact; the limit spring 5 is mainly used to limit the range of motion of the nut assembly 2, and the stop spring 6 can provide additional resistance or support on this basis, further preventing excessive movement of components, helping to ensure that the electronic expansion valve can maintain precise flow control during operation and avoid performance problems caused by excessive movement of components.

[0039] In order to protect the entire device, a sleeve 7 is provided on the outside of the rotor component 3. As the outer protective structure of the rotor component 3, the sleeve 7 can effectively prevent the rotor component 3 from being corroded by dust, dirt or other impurities in the external environment, which helps to keep the rotor component 3 clean and intact, ensure its normal operation and extend its service life; the sleeve 7 tightly wraps the rotor component, providing it with additional support and fixation. This helps to enhance the stability of the entire structure and reduce the risk of loosening or damage of components due to vibration or impact.

[0040] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electronic expansion valve, characterized in that: include: A valve needle component (1) located at the center of the electronic expansion valve; A nut assembly (2) is sleeved on the outer side of the upper middle portion of the valve needle component (1); A rotor component (3) is provided on the outer side of the nut component (2), and a certain gap is provided between the nut component (2) and the rotor component (3); A valve core component (4) located at the bottom end of the valve needle component (1); Wherein, the valve needle component (1) comprises a screw rod (11), a spring sleeve (12), a preload spring (13) and a valve needle (14); the screw rod (11) and the spring sleeve (12) are clearance-fitted, the spring sleeve (12) and the valve needle (14) are interference-fitted and connected by laser welding, and the preload spring (13) is arranged in the spring sleeve (12) and partially mounted on the valve needle (14).

2. The electronic expansion valve according to claim 1, characterized in that: A limit spring (5) is arranged outside the nut assembly (2), and the upper and lower ends of the limit spring (5) are arranged to be bent at one point, with the upper end being bent inwards and the lower end being bent vertically.

3. The electronic expansion valve according to claim 1, characterized in that: The nut assembly (2) is formed by injection molding with the nut connecting plate (21) serving as an insert; The nut connecting plate (21) is a metal part.

4. The electronic expansion valve according to claim 2, characterized in that: The nut assembly (2) is provided with an injection molding groove (22) at the lower end and an oblique injection molding groove (23) at the upper end; the lower end of the limit spring (5) is placed in the injection molding groove (22), and the upper end of the limit spring (5) is buckled in the oblique injection molding groove (23).

5. The electronic expansion valve according to claim 1, characterized in that: The rotor component (3) is formed by injection molding with the magnetic ring connecting plate (31) serving as an insert, and the magnetic ring connecting plate (31) is a metal part; The rotor component (3) is provided with a trapezoidal long strip magnetic ring rib (32), and the magnetic ring rib (32) is integrally formed by injection molding.

6. The electronic expansion valve according to claim 1, characterized in that: The interior of the valve core component (4) is provided with a groove which fits with the end of the valve needle (14).

7. The electronic expansion valve according to claim 2, characterized in that: At the lower part of the limit spring (5), a stop spring (6) is arranged alternately with the limit spring (5).

8. The electronic expansion valve according to claim 1, characterized in that: A sleeve (7) is provided on the outer side of the rotor component (3).

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