JP7431993B2 - electronic expansion valve - Google Patents

Description

The present application relates to the technical field of electronic expansion valves, and specifically relates to an electronic expansion valve and a method of manufacturing the electronic expansion valve.

The connecting members engaged with the magnetic rotor and screw in conventional electronic expansion valves are usually powder metallurgy construction, and the cost of such a process is relatively high. Furthermore, due to the characteristics of powder metallurgy materials, when welding with other parts, the welding position of the connecting member becomes black, and the welding strength is insufficient, making it difficult to ascertain the quality of the welding. Therefore, there is a need to optimize electronic expansion valves to reduce costs and improve quality.

The present application provides an electronic expansion valve and a method of manufacturing the electronic expansion valve to reduce the manufacturing cost of the electronic expansion valve.

In order to achieve the above object, according to one aspect of the present application, the present application includes a magnetic rotor, at least a portion of which is fixedly provided within the magnetic rotor, and has a first engagement hole. , a connecting member having an injection molded structure, a limiting member having a second engaging hole that is limitedly engaged with the connecting member and provided corresponding to the first engaging hole, and passing through the first engaging hole; The electronic expansion valve includes a screw fixedly connected to the inner wall of the second engagement hole, and a movable guide shaft fixedly provided and extending inside the magnetic rotor along the axial direction of the magnetic rotor. .

Furthermore, the movement guide shaft is fixedly connected to the connecting member.

Furthermore, the moving guide shaft is an injection molded structure.

Furthermore, the connecting member and the movement guide shaft are of integral construction.

Further, the connecting member includes a plate and a cam provided on the plate, the first engagement hole is located in the plate, and the cam and the limiting member are limitedly engaged.

Furthermore, the cam has a restriction groove, at least a portion of the restriction member is provided within the restriction groove, and the outer peripheral surface of the restriction member is limitedly engaged with the inner peripheral surface of the restriction groove.

Furthermore, the outer circumferential surface of the limiting member is made up of a plurality of planes and/or arcuate surfaces, and the shape of the inner circumferential surface of the limiting groove matches the shape of the outer circumferential surface of the limiting member.

Further, the screw passes through the second engagement hole, and the outer wall of the screw is welded to the inner wall of the second engagement hole.

Further, the outer circumferential surface of the connecting member is made up of a plurality of planes and/or arcuate surfaces, and has an annular groove on the inner wall of the magnetic rotor, and the peripheral edge of the connecting member is provided within the annular groove. The shape of the annular bottom wall and the outer peripheral surface of the connecting member match.

According to another aspect of the present application, the connecting member is injection molded, the connecting member is secured within the magnetic rotor, the restricting member is stamp-molded, and the restricting member is pressed into the connecting member. A method for manufacturing an electronic expansion valve is provided, which includes: passing a screw through a connecting member and a limiting member; and connecting the limiting member and the screw by welding.

When the technical aspect of the present application is applied, a magnetic rotor, a connecting member at least partially fixed within the magnetic rotor, having a first engagement hole, and having an injection molded structure; A limiting member that is limitedly engaged and has a second engagement hole provided corresponding to the first engagement hole, passes through the first engagement hole, and is fixedly connected to the inner wall of the second engagement hole. An electronic expansion valve is provided that includes a screw and a movable guide shaft that is fixedly provided and extends within the magnetic rotor along the axial direction of the magnetic rotor. Adopting this aspect, the connecting member is an injection molded structure, and the connecting member and the limiting member are limitedly engaged, reducing the manufacturing cost of a single part compared to a connecting member having a conventional powder metallurgy structure. In addition, since there is no need to weld the connecting member and the limiting member, assembly costs can be reduced.

The drawings in the specification forming part of the present application are for the purpose of providing a further understanding of the present application, and the schematic embodiments of the present application and their description are for the purpose of interpreting the present application. , and are not intended to unduly limit this application.

1 shows a structural schematic diagram of an electronic expansion valve provided in an embodiment of the present application. 2 shows another schematic diagram of the electronic expansion valve in FIG. 1. FIG. A schematic diagram of a partial structure in FIG. 1 is shown. The schematic diagram of the connection member and movement guide shaft in FIG. 1 is shown. Another schematic diagram of the connecting member and the movement guide shaft in FIG. 4 is shown. FIG. 2 shows a schematic structural diagram of the limiting member in FIG. 1. FIG.

Here, the following symbols are included in the above drawings.
Reference Signs List 10 magnetic rotor, 20 connection member, 21 first engagement hole, 22 plate, 23 cam, 24 restriction groove, 25 waste hole, 30 restriction member, 31 second engagement hole, 40 screw, 50 movement guide shaft.

Hereinafter, technical aspects in the embodiments of the present application will be clearly and completely explained with reference to the drawings in the embodiments of the present application. It is clear that the described embodiments are only some, but not all, of the embodiments of the present application. The following description of at least one exemplary embodiment is merely illustrative in nature and is not to be construed as any limitation on the present application and its application or use. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative efforts fall within the protection scope of this application.

As shown in the drawings, the embodiment of the present application includes a magnetic rotor 10, at least a portion of which is fixedly provided within the magnetic rotor 10, has a first engagement hole 21, and has an injection molded structure. passing through the connecting member 20, a limiting member 30 which is limitedly engaged with the connecting member 20 and has a second engaging hole 31 provided corresponding to the first engaging hole 21, and the first engaging hole 21; and a screw 40 that is fixedly connected to the inner wall of the second engagement hole 31 and a moving guide shaft 50 that is fixedly provided and extends inside the magnetic rotor 10 along the axial direction of the magnetic rotor 10. Provide an expansion valve.

When the technical aspect of the present application is applied, a magnetic rotor 10, a connecting member 20 that is at least partially fixedly provided within the magnetic rotor 10, has a first engagement hole 21, and has an injection molded structure. , a limiting member that is limitedly engaged with the connecting member 20 and has a second engagement hole 31 provided corresponding to the first engagement hole 21; Provided is an electronic expansion valve including a screw 40 fixedly connected to the inner wall of the hole 31 and a moving guide shaft 50 fixedly provided and extending inside the magnetic rotor 10 along the axial direction of the magnetic rotor 10. . When this embodiment is adopted, the connecting member 20 has an injection molded structure, and the connecting member 20 and the limiting member are limitedly engaged, and the manufacturing cost of a single part is reduced compared to the connecting member 20 having a conventional powder metallurgy structure. Since it is not necessary to weld the connecting member 20 and the limiting member, assembly costs can be reduced. The axial movement distance of the magnetic rotor 10 can be limited by the engagement of the movement guide shaft 50 with other structures. Furthermore, since both the first engagement hole 21 and the second engagement hole 31 restrict the screw 40, the length of the restriction area for the screw 40 can be increased, and the strength and stability of the structure can be improved. .

In this embodiment, the moving guide shaft 50 is fixedly connected to the connecting member 20. Thereby, the movable guide shaft 50 can be fixed by fixing the movable guide shaft 50 to the connecting member 20.

In this embodiment, the moving guide shaft 50 is an injection molded structure. Thereby, the manufacturing cost of the moving guide shaft 50 can be reduced.

Furthermore, the connecting member 20 and the movement guide shaft 50 are of integral construction. Thereby, injection molding can be employed to manufacture the connecting member 20 and the movement guide shaft 50 that are integrated, thereby improving the connection strength and reducing the manufacturing cost. Specifically, the connecting member 20 and the movement guide shaft 50 are made of polyether plastic (PPS).

In this embodiment, the connecting member 20 includes a plate 22 and a cam 23 provided on the plate 22, the first engagement hole 21 is located in the plate 22, and the cam 23 is limitedly engaged with the limiting member 30. be done. The above design allows the cam 23 and the limiting member 30 to be easily engaged.

Optionally, by having sacrificial holes 25 in the plate, the amount of material used can be reduced. In order to easily insert the screw 40, the lower end of the first engagement hole 21 has a chamfered periphery.

Optionally, the plate body 22 communicates with the first engagement hole 21 , has a third diameter larger than the diameter of the first engagement hole 21 , and is located between the first engagement hole 21 and the restriction member 30 . It has an engagement hole. To facilitate welding of the screw 40 and the restriction member 30, welding material can be placed in the third engagement hole.

In this embodiment, the cam 23 has a restriction groove 24 , at least a portion of the restriction member 30 is provided within the restriction groove 24 , and the outer peripheral surface of the restriction member 30 is limitedly engaged with the inner peripheral surface of the restriction groove 24 . Ru. The above design makes it possible to limit the limiting member 30 and the connecting member 20 in the circumferential direction. Optionally, the restriction member 30 and the restriction groove 24 are an interference fit to improve connection strength. Since the restriction member 30 can be installed in the restriction groove 24 by pressing, the process is simple, the operation is easy, and the production cost is low.

In this embodiment, the outer circumferential surface of the limiting member 30 is composed of a plurality of planes and/or arcuate surfaces, and the shape of the inner circumferential surface of the limiting groove 24 and the shape of the outer circumferential surface of the limiting member 30 match. With the above design, it is possible to easily restrict the limiting member 30 and the connecting member 20 in the circumferential direction and prevent them from moving relative to each other in the circumferential direction.

In this embodiment, the screw 40 passes through the second engagement hole 31, and the outer wall of the screw 40 is welded to the inner wall of the second engagement hole 31. Thereby, reliable fixation between the screw 40 and the limiting member 30 can be realized. Furthermore, this makes it possible to securely fix the three members without fixedly connecting the screw 40 to the connecting member 20 or welding the limiting member 30 and the connecting member 20, thereby facilitating assembly.

Optionally, the screw 40 includes a first rod segment and a second rod segment connected to each other, the first rod segment having a diameter smaller than the second rod segment, and the first rod segment having a first engagement hole. 21 and the second engagement hole 31, and the step between the first rod segment and the second rod segment abuts the connecting member 20, thereby realizing restriction and positioning of both in the axial direction.

In this embodiment, the outer circumferential surface of the connecting member 20 is made up of a plurality of planes and/or arcuate surfaces, and the inner wall of the magnetic rotor 10 has an annular groove, and the peripheral edge of the connecting member 20 is provided within the annular groove. The shape of the annular bottom wall of the annular groove and the outer peripheral surface of the connecting member 20 match. By employing the above design, it is possible to realize a reliable connection between the connecting member 20 and the magnetic rotor 10, and to prevent them from moving relative to each other in the circumferential direction.

Optionally, in another embodiment not shown, the limiting member 30 and the connecting member 20 are of integrally molded construction. This makes it possible to reduce the number of parts and facilitate processing.

Another embodiment of the present application includes injection molding the connecting member 20, fixing the connecting member 20 within the magnetic rotor 10, stamping the limiting member 30, and forming the limiting member 30 into the connecting member. 20; passing a screw 40 through the connecting member 20 and the limiting member 30; and connecting the limiting member 30 and the screw 40 by welding. do. Adopting this manufacturing method, the connecting member 20 has an injection molding structure, and the connecting member 20 and the limiting member are pressed into engagement, making it a single piece compared to the conventional powder metallurgy structured connecting member 20. Manufacturing costs can be reduced, and since there is no need to weld the connecting member 20 and the limiting member, assembly costs can be reduced. Furthermore, the limiting member 30 and the screw 40 are connected by welding, making the operation easy and the quality reliable. Therefore, the quality of the electronic expansion valve can be improved and production costs can be reduced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and those skilled in the art may make various modifications and changes to the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included within the protection scope of this application.

Claims (6)

a magnetic rotor (10);
a connecting member (20) at least partially fixedly provided within the magnetic rotor (10) and having a first engagement hole (21);
a limiting member (30) that is limitedly engaged with the connecting member (20) and has a second engagement hole (31) provided corresponding to the first engagement hole (21);
a screw (40) that passes through the first engagement hole (21) and is fixedly connected to the inner wall of the second engagement hole (31);
a movable guide shaft (50) fixedly provided and extending within the magnetic rotor (10) along the axial direction of the magnetic rotor (10) ;
The connecting member (20) includes a plate (22) and a cam (23) provided on the plate (22), and the first engagement hole (21) is located in the plate (22). , the cam (23) and the limiting member (30) are in limited engagement;
The cam (23) has a restriction groove (24), at least a portion of the restriction member (30) is provided within the restriction groove (24), and the outer circumferential surface of the restriction member (30) is arranged in the restriction groove. (24) An electronic expansion valve limitedly engaged with the inner circumferential surface of . The electronic expansion valve according to claim 1, wherein the moving guide shaft (50) is fixedly connected to the connecting member (20). The electronic expansion valve according to claim 2 , wherein the connecting member (20) and the movement guide shaft (50) are of integral construction. The outer circumferential surface of the limiting member (30) is composed of a plurality of planes and/or arcuate surfaces, and the shape of the inner circumferential surface of the limiting groove (24) matches the shape of the outer circumferential surface of the limiting member (30). The electronic expansion valve according to claim 1 . The electronic device according to claim 1, wherein the screw (40) passes through the second engagement hole (31), and the outer wall of the screw (40) is welded to the inner wall of the second engagement hole (31). expansion valve. The outer peripheral surface of the connecting member (20) is made up of a plurality of planes and/or arcuate surfaces, and has an annular groove on the inner wall of the magnetic rotor (10), and the peripheral edge of the connecting member (20) is formed in the annular groove. The electronic expansion valve according to claim 1, wherein the electronic expansion valve is provided in a groove, and the annular bottom wall of the annular groove and the outer peripheral surface of the connecting member (20) match in shape.

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