JP7748564B2 - Coil assembly and electronic expansion valve having the same - Google Patents

Description

This application claims priority to a patent application filed with the State Intellectual Property Office of China on December 15, 2021, bearing application number 2021231767335 and entitled "Coil assembly and electronic expansion valve having the same."

This application relates to the technical field of electronic expansion valves, and more particularly to a coil assembly and an electronic expansion valve having the same.

Currently, conventional coil assemblies include a main body, a connecting seat, and a circuit board. The main body houses a stator assembly, and the connecting seat is used to secure a pin structure. One end of the pin structure is connected to the stator assembly, and the other end is electrically connected to the circuit board. When processing the main body and connecting seat, they are placed in an injection mold and fixed by injecting a molding compound. However, during the injection molding process, the molding compound experiences a flow obstruction at the connection point between the main body and the connecting seat, reducing the flow efficiency of the molding compound. After molding, air bubbles form inside the connection point between the main body and the connecting seat, reducing its sealing and insulating effectiveness and further reducing the quality of the entire coil assembly.

This application provides a coil assembly and an electronic expansion valve having the same to solve the problem of reduced injection molding efficiency of coil assemblies in the prior art.

According to one aspect of the present application, there is provided a coil assembly including: a main body having an accommodating chamber; a stator assembly provided within the accommodating chamber and having a pin; and a connecting seat provided on a side wall of the main body and injection molded integrally with the main body, the connecting seat having a mounting surface and multiple side surfaces, the mounting surface being located on one side of the connecting seat away from the main body, the end of the pin protruding from the mounting surface, the side surfaces of the connecting seat and the main body being connected to each other, and a first transition structure being provided at a connection point between at least one of the side surfaces of the connecting seat and the main body.

When the technical aspects of the present application are applied, the connecting seat and the main body are formed as a single-piece structure during processing, and the side surface of the connecting seat and the main body are connected to each other. At the same time, a first transition structure is provided at the connection point between the connecting seat and the main body. By using the above structure, the first transition structure can be used to reduce the resistance at the connection point between the connecting seat and the main body when injection molding the molding compound. This allows the molding compound to flow more smoothly, reducing the overall occurrence of air bubbles after final molding. This improves sealing and insulation performance and ensures the quality of the coil assembly.

Furthermore, the first transition structure includes a transition arc surface that contacts the side wall on which the transition arc surface of the connecting seat is located, and the transition arc surface contacts the side wall of the main body. This design facilitates processing and at the same time further ensures the flow effect of the molding compound and the molding effect of the connection point between the connecting seat and the main body.

Furthermore, the radius of the transition arc surface is A, and 4 mm ≥ A ≥ 0.5 mm. If the radius of the transition arc surface is less than 0.5 mm, the structural dimensions of the first transition structure will be too small, and the molding compound will still have a relatively large resistance when in the first transition structure, affecting the flow of the molding compound. If the radius of the transition arc is more than 4 mm, the structural dimensions of the first transition structure will be too large, causing interference with the connecting seat or other components and affecting the normal connection between the coil assembly and other components.

Furthermore, the first transition structure includes a transition inclined surface, and the included angle between the transition inclined surface and the side surface of the connecting seat on which the transition inclined surface is located is B, where 180° > B ≥ 130°. This design makes it easier to process the coil assembly and allows the molding compound to flow more smoothly.

Furthermore, the connecting seat has a first side, a second side, a third side, and a fourth side, the first side and the second side being opposite each other, and the third side and the fourth side being opposite each other, the first side and the second side being located on either side of the connecting seat, respectively, and the third side and the fourth side being located on the top and bottom of the connecting seat, respectively. There are multiple first transition structures, and a first transition structure is provided between the first side and the main body, between the second side and the main body, and between the third side and the main body. Providing multiple first transition structures can further improve the smoothness of the flow of the molding compound, ensuring that no air bubbles are generated at the connection points between the first side, second side, and third side of the connecting seat and the main body, thereby improving the quality of the entire coil assembly.

Furthermore, a second transition structure is provided between the connecting seat and the side wall of the main body, and the second transition structure is located between two adjacent first transition structures and connects the two adjacent first transition structures. With this design, the second transition structure can prevent gaps from occurring between two adjacent first transition structures, further ensuring the product quality of the coil assembly.

Furthermore, at least one first transition structure is a transition arc surface, and at least one of the remaining first transition structures is a transition inclined surface. This design allows for greater flexibility in the processing of the connection seat and the main body, and different structures can be provided at the connection point between the connection seat and the main body to accommodate different usage situations.

According to another aspect of the present application, there is provided an electronic expansion valve including the coil assembly provided above. After using the coil assembly provided in the above embodiment, this electronic expansion valve can improve the product quality of the electronic expansion valve and extend the service life of the electronic expansion valve.

The drawings in the specification that form part of this application are intended to provide a further understanding of the application, and the schematic examples and their descriptions in the application are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

1 shows a structural schematic diagram of a coil assembly provided in Example 1 of the present application. FIG. 1 shows a top view of a coil assembly provided in Example 1 of the present application. FIG. 1 shows a structural schematic diagram of a coil assembly provided in Example 2 of the present application. FIG. 1 shows a top view of a coil assembly provided in Example 2 of the present application.

Here, the above drawings include the following reference numerals:
10 Main body, 20 Connection seat, 21 First transition structure, 22 First side surface, 23 Second side surface, 24 Third side surface, 25 Second transition structure.

The technical aspects of the embodiments of the present application will be described below clearly and completely with reference to the drawings in the embodiments of the present application. However, it should be understood that the described embodiments are merely some of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is, in fact, merely explanatory and does not impose any limitations on the present application, its applications, or uses. All other embodiments that can be obtained by a person skilled in the art based on the embodiments of the present application without any creative effort shall fall within the scope of protection of the present application.

As shown in Figures 1 and 2, an embodiment of the present application provides a coil assembly including a main body 10, a stator assembly, and a connecting seat 20. The main body 10 has an accommodating chamber, a stator assembly disposed within the accommodating chamber, and a pin. The connecting seat 20 is disposed on a side wall of the main body 10, and the connecting seat 20 and the main body 10 are integrally injection molded. The connecting seat 20 has a mounting surface and multiple side surfaces. The mounting surface is located on one side of the connecting seat 20 away from the main body 10, and the ends of the pins protrude from the mounting surface. The side surfaces of the connecting seat 20 and the main body 10 are connected to each other, and a first transition structure 21 is provided at a connection point between at least one side surface of the connecting seat 20 and the main body 10.

When the technical aspects of the present application are applied, the connecting seat 20 and the main body 10 form a one-piece molded structure during processing, and the side of the connecting seat 20 and the main body 10 are connected to each other. At the same time, a first transition structure 21 is provided at the connection point between the connecting seat 20 and the main body 10. By using the above structure, the first transition structure 21 can be used to reduce the resistance at the connection point between the connecting seat 20 and the main body 10 when injection molding the molding compound, allowing the molding compound to flow more smoothly and reducing the overall occurrence of air bubbles after final molding. This improves sealing and insulation performance and ensures the quality of the coil assembly.

Here, the first transition structure 21 includes a transition arc surface that contacts the side wall on which the transition arc surface of the connecting seat 20 is located, and the transition arc surface contacts the side wall of the main body 10. The transition arc surfaces contact the side wall of the connecting seat 20 and the side wall of the main body 10, respectively. This design facilitates processing and at the same time further ensures the flow effect of the molding compound and ensures the molding effect at the connection point between the connecting seat 20 and the main body 10.

Furthermore, the radius of the transition arc surface is A, and 4 mm ≥ A ≥ 0.5 mm. If the radius of the transition arc surface is less than 0.5 mm, the structural dimensions of the first transition structure 21 will be too small, and the molding compound will still encounter a relatively large resistance in the first transition structure 21, affecting the flow of the molding compound. If the radius of the transition arc is more than 4 mm, the structural dimensions of the first transition structure 21 will be too large, causing interference with the connecting seat 20 or other components, and affecting the normal connection between the coil assembly and other components.

Here, the connecting seat 20 may be a cylindrical body or a polygonal prism, and the first transition structure 21 may be annularly arranged around the outer periphery of the connecting seat 20, or may be partially arranged outside the connecting seat 20.

In this embodiment, the connecting seat 20 has a first side surface 22, a second side surface 23, a third side surface 24, and a fourth side surface, the first side surface 22 and the second side surface 23 being opposite each other, the third side surface 24 and the fourth side surface being opposite each other, the first side surface 22 and the second side surface 23 being located on both sides of the connecting seat 20, and the third side surface 24 and the fourth side surface being located on the top and bottom of the connecting seat 20, respectively. There are multiple first transition structures 21, and a first transition structure 21 is provided between the first side surface 22 and the main body 10, between the second side surface 23 and the main body 10, and between the third side surface 24 and the main body 10. The provision of multiple first transition structures 21 further improves the smoothness of the flow of molding compound, ensuring that no air bubbles are generated at the connections between the first side 22, second side 23, and third side 24 of the connecting seat 20 and the main body, and further ensuring the processing efficiency of the connections between the first side 22, second side 23, and third side 24 of the connecting seat 20 and the main body, improving the quality of the entire coil assembly.

Here, a second transition structure 25 is further provided between the connecting seat 20 and the side wall of the main body 10. The second transition structure 25 is located between two adjacent first transition structures 21 and is used to connect the two adjacent first transition structures 21. Designed in this manner, the second transition structure 25 can prevent gaps from occurring between the two adjacent first transition structures 21, thereby further ensuring the product quality of the coil assembly and strengthening the structural strength of the coil assembly.

As shown in Figures 3 and 4, Example 2 of the present application provides a coil assembly that differs from Example 1 in that the first transition structure 21 includes a transition inclined surface, and the included angle between the transition inclined surface and the side surface of the connecting seat 20 on which the transition inclined surface is located is B, where 180° > B ≥ 130°. This design facilitates processing of the coil assembly and allows the molding compound to flow more smoothly. If the included angle between the transition inclined surface and the side surface of the connecting seat 20 on which the transition inclined surface is located is less than 130°, the included angle is too small, and the molding compound still encounters relatively large resistance, the molding compound does not flow smoothly, and many air bubbles still occur after molding, making it difficult to ensure the quality of the coil assembly.

Example 3 of the present application provides a coil assembly that differs from Example 1 in that at least one first transition structure 21 is a transition arc surface, and at least one of the remaining first transition structures 21 is a transition inclined surface. Here, transition arc surfaces may be provided between the first side surface 22, the second side surface 23, and the main body 10, and a transition inclined surface may be provided between the third side surface 24 and the main body 10, or a transition inclined surface may be provided between the first side surface 22, the second side surface 23, and the main body 10, and a transition arc surface may be provided between the third side surface 24 and the main body 10. This design allows for greater flexibility in the processing of the connecting seat 20 and the main body 10, and different structures may be provided at the connection points between the connecting seat 20 and the main body 10 to accommodate different usage situations.

Example 4 of the present application provides an electronic expansion valve including the coil assembly provided in the above example. After using the coil assembly provided in the above example, this electronic expansion valve can improve the product quality of the electronic expansion valve and extend the service life of the electronic expansion valve.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present application. As used herein, the singular also includes the plural unless the context clearly dictates otherwise. Furthermore, it should be understood that when the terms "comprise" and/or "include" are used herein, it means that features, steps, operations, devices, assemblies, and/or combinations thereof are present.

Unless otherwise specifically stated, the relative arrangement of components and steps, formulas, and numerical values described in these examples do not limit the scope of this application. At the same time, it should be understood that, for the sake of convenience, the dimensions of each part shown in the drawings are not drawn to actual proportions. Detailed descriptions of techniques, methods, and equipment already known to those skilled in the art may be omitted; however, if necessary, these techniques, methods, and equipment should be considered part of the approved specification. In all examples shown and described herein, any specific values should be construed as merely illustrative and not limiting. Therefore, other examples of the illustrative embodiments may have different values. It should be noted that similar symbols and characters represent similar things in the following drawings, so once something is defined in one drawing, it need not be further described in subsequent drawings.

In the description of this application, orientations or positional relationships expressed using directional terms such as "front, back, top, bottom, left, right," "lateral, longitudinal, vertical, horizontal," and "top, bottom" are generally based on the orientations or positional relationships shown in the drawings, but this is merely for the ease and simplicity of the description of this application. Unless otherwise stated, these directional terms do not necessarily indicate or imply that the devices or elements shown have a particular orientation or are constructed or operated in a particular orientation, and therefore should not be understood as limiting the scope of protection of this application. Orientation terms such as "inside, outside" refer to the inside and outside of the contours of each component itself.

For convenience of explanation, spatially relative terms such as "above," "upper," "on top of," "above," etc. may be used herein to describe the spatial relationship of one device or feature to another, as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations during use or operation other than the orientation depicted in the device figures. For example, if a device in the figures were turned upside down, a device described as "above other devices or structures" or "on top of other devices or structures" would then be positioned "below other devices or structures" or "below other devices or structures." Thus, the exemplary term "above" can encompass two orientations: "above" and "below." The device can also be positioned in other different ways (rotated 90 degrees or positioned at other orientations), and a corresponding interpretation given to the spatially relative descriptions used herein.

Furthermore, it should be explained that the use of terms such as "first" and "second" to define components is merely intended to distinguish corresponding components, and unless otherwise specified, the terms do not have any special meaning and should not be understood as limiting the scope of protection of the present application.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (6)

a main body (10) having a storage chamber;
a stator assembly disposed within the chamber and having a pin;
A connecting seat (20) ,
The connecting seat (20) is provided on the side wall of the main body (10) ,
The connecting seat (20) is integrally formed with the main body (10) by injection molding,
The connecting seat (20) has a mounting surface and a plurality of side surfaces , the mounting surface is located on one side of the connecting seat (20) away from the main body (10), and the end of the pin is provided to protrude from the mounting surface,
The side surface of the connecting seat (20) and the main body (10) are connected to each other , and a first transition structure (21) is provided at a connection point between at least one side surface of the connecting seat (20) and the main body (10);
The connecting seat (20) has a first side surface (22), a second side surface (23), a third side surface (24), and a fourth side surface, the first side surface (22) and the front second side surface (23) are arranged opposite each other, the third side surface (24) and the fourth side surface are arranged opposite each other, the first side surface (22) and the second side surface (23) are respectively located on both sides of the connecting seat (20), and the third side surface (24) and the fourth side surface are respectively located at the top and bottom of the connecting seat (20),
The number of the first transition structures (21) is plural,
The first transition structure (21) is provided between the first side surface (22) and the main body (10), between the second side surface (23) and the main body (10), and between the third side surface (24) and the main body (10),
A second transition structure (25) is further provided between the connecting seat (20) and the side wall of the main body (10),
The second transition structure (25) is located between two adjacent first transition structures (21) and connects the two adjacent first transition structures (21) .
Coil assembly. The first transition structure (21) includes a transition arc surface;
The transition arc surface contacts the side wall of the connecting seat (20) on which the transition arc surface is located,
The coil assembly of claim 1 , wherein the transition arc surface abuts a side wall of the body (10). The coil assembly of claim 2, wherein the radius of the transition arc surface is A, and 4 mm ≥ A ≥ 0.5 mm. The first transition structure (21) includes a transition slope,
2. The coil assembly according to claim 1, wherein an included angle B between the transition inclined surface and a side surface of the connecting seat (20) on which the transition inclined surface is located satisfies 180°>B≧130°. At least one of the first transition structures (21) is a transition arc surface;
The coil assembly of claim 1 , wherein at least one first transition structure of the remaining plurality of first transition structures (21) is a transition ramp. An electronic expansion valve comprising a coil assembly according to any one of claims 1 to 5 .