Integrated injection molding structure of expansion valve

Abstract

The utility model relates to an integral injection molding structure of an expansion valve, which comprises a coil and a valve body arranged in the coil in a penetrating manner, one end of the coil is connected with a circuit board, the lower end of the circuit board is connected with a wire harness, an injection molding body is coated outside the coil, a buckle for fixing and positioning the valve body is arranged on the injection molding body, and the valve body is connected with the coil. The injection molding body, the buckle and the insulation skin of the wire harness are formed in an injection molding mode at a time, the buckle, the injection molding body and the insulation skin of the wire harness are of an integrally-formed structure, the buckle, the valve body and the coil can be integrally guided and connected conveniently, in this way, the production efficiency can be effectively improved, the wire harness and a circuit board can be wrapped conveniently, and a compact waterproof layer is formed; and the waterproof, anti-creeping and short-circuit effects are achieved.

Description

Technical Field

[0001] This utility model relates to the field of expansion valve technology, and in particular to an integral injection-molded structure for an expansion valve. Background Technology

[0002] With the development of technology, devices such as transformers and inductors have been more widely used in today's society. Among these devices, electronic expansion valves play a crucial role.

[0003] In electric vehicle thermal management systems, electronic expansion valves are mainly used in air conditioning and battery thermal management systems. An electronic expansion valve consists of three parts: a controller, an actuator, and a sensor. Because the temperature sensing element of an electronic expansion valve is a thermocouple or resistance temperature detector (RTD), it can accurately reflect changes in superheat at low temperatures, providing more accurate flow regulation. Furthermore, electronic expansion valves have a wide flow control range, are highly responsive, act quickly, and offer precise adjustment, overcoming the limitations of capillary tubes and thermostatic expansion valves, making them more suitable for the electronic and refined thermal management of electric vehicles.

[0004] In existing technologies, electronic expansion valves typically employ a protruding fixing plate on the coil housing to facilitate connection between the valve body and the coil. The fixing plate secures a positioning plate to the coil housing, and the positioning plate then provides axial and circumferential positioning for both the valve body and the coil. This method of connecting the valve body and coil is relatively complex. The fixing plate and positioning plate, as well as the positioning plate and coil housing, require riveting or welding, resulting in a complex manufacturing process. This leads to lower production efficiency and increased production costs for electronic expansion valves.

[0005] To address the aforementioned shortcomings, existing technologies connect the valve body and the snap-fit ​​part through integral injection molding. While this improves production efficiency, the circuit board and coil, as well as the circuit board and wire harness, are all connected by solder, with the solder joints exposed. This results in poor sealing, lack of waterproofing, and a tendency to cause leakage and short circuits. Furthermore, since the positioning piece in existing technologies is a separate structure, it needs to be riveted or welded to the fixing plate and the coil housing, making the manufacturing process still complex. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing an integrated injection-molded structure for an expansion valve. This structure integrates the buckle with the injection-molded body and the insulation of the wire harness into a single unit, facilitating the overall connection of the buckle with the valve body and coil. This not only effectively improves production efficiency but also facilitates the wrapping of the wire harness and circuit board to form a dense waterproof layer, achieving waterproofing, leakage prevention, and short-circuit protection.

[0007] To achieve this objective, the technical solution adopted by this utility model is:

[0008] An integral injection-molded structure for an expansion valve includes a coil and a valve body passing through the coil. One end of the coil is connected to a circuit board, and the lower end of the circuit board is connected to a wire harness. The coil is covered by an injection-molded body, and the injection-molded body is provided with a buckle for fixing and positioning the valve body. The injection-molded body, the buckle, and the insulation of the wire harness are integrally formed. The buckle includes a buckle body, and the upper bottom end of the buckle body is provided with a bubble. The bubble includes a semi-circular protrusion, and both sides between the semi-circular protrusion and the upper bottom end of the buckle body form an arc transition surface.

[0009] As a further optimization of the above technical solution: the injection-molded body includes an injection-molded layer covering the coil, and one side of the injection-molded layer is provided with an injection-molded sleeve that covers the insulation of the circuit board and the wire harness, and the upper end of the injection-molded sleeve is provided with the buckle.

[0010] As a further optimization of the above technical solution: the buckle body is a vertically bent structure, the bottom end of the buckle body is located at the upper end of the injection molded sleeve, and the upper end of the buckle body extends above the injection molded layer.

[0011] As a further optimization of the above technical solution: the buckle is arranged opposite to the wire harness.

[0012] As a further optimization of the above technical solution: a positioning groove is provided on the top of the injection molding layer on the side below the buckle to facilitate the assembly and insertion of the valve body, and the gap is 0.1~0.6mm.

[0013] Compared with the prior art, this utility model includes a coil and a valve body inserted inside the coil. One end of the coil is connected to a circuit board, and the lower end of the circuit board is connected to a wire harness. The coil is covered with an injection-molded body, and the injection-molded body is provided with a buckle for fixing and positioning the valve body. The injection-molded body, the buckle, and the insulation of the wire harness are integrally formed. By making the buckle, the injection-molded body, and the insulation of the wire harness into an integral structure, it is easy to connect the buckle to the valve body and the coil as a whole. This can effectively improve production efficiency and facilitate the covering of the wire harness and the circuit board to form a dense waterproof layer, which can achieve the effects of waterproofing, preventing leakage and short circuit. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is an exploded structural diagram of the present invention.

[0016] Figure 3 This is a cross-sectional view of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1-3 As shown, an integral injection-molded structure of an expansion valve includes a coil 1 and a valve body passing through the coil 1. One end of the coil 1 is connected to a circuit board 3, and the lower end of the circuit board 3 is connected to a wire harness 4. The coil 1 is covered by an injection-molded body 5, and the injection-molded body 5 is provided with a buckle 6 for fixing and positioning the valve body. The injection-molded body 5, the buckle 6, and the insulation of the wire harness 4 are integrally formed. The buckle 6 and the wire harness 4 are arranged opposite to each other, so that the wire harness 4 does not need to be bent after the whole machine is assembled, reducing the installation space and the risk of wire breakage. The gap between the buckle 6 and the coil 1 is not less than 0.2mm. By making the buckle 6, the injection-molded body, and the insulation of the wire harness 4 into an integral structure, it is easy to insert and connect the buckle 6 to the valve body and the coil 1 as a whole. This can effectively improve production efficiency and facilitate the covering of the wire harness 4 and the circuit board 3 to form a dense waterproof layer, which can achieve the effects of waterproofing, preventing leakage and short circuit.

[0019] In this embodiment, the buckle 6 includes a buckle body 61, and the buckle body 61 has a bubble 62 at its upper bottom end. The bubble 62 includes a semi-circular protrusion 63. Both sides of the semi-circular protrusion 63 and the upper bottom end of the buckle body 61 are formed with arc transition surfaces 64, which can effectively enhance the buckle 6's strength in engaging the valve body and facilitate better engagement of the valve body between the buckle 6 and the injection-molded body 5.

[0020] In this embodiment, the injection-molded body 5 includes an injection-molded layer 51 covering the coil 1. One side of the injection-molded layer 51 is provided with an injection-molded sleeve 52 covering the insulation of the circuit board 3 and the wire harness 4. The upper end of the injection-molded sleeve 52 is provided with a buckle 6. A positioning groove 511, with a gap of 0.1~0.6mm, is provided on the side of the top of the injection-molded layer corresponding to the side below the buckle 6 to facilitate valve body assembly and insertion. The buckle body 61 has a vertically bent structure, with its bottom end located at the upper end of the injection-molded sleeve 52. The upper end extends above the injection molding layer 51. By opening a fixing and positioning groove 511 on the injection molding layer 51, the valve body can be accurately fixed and positioned. The injection molding layer 51 facilitates the matching installation of the coil 1. During production, the wire harness 4 is first welded to the circuit board 3, then the injection molding body 5 and the buckle 6 are integrally injection molded, then the coil 1 is matched and installed in the injection molding layer 51 and connected to the circuit board 3. Finally, the valve body is inserted into the coil 1 and then inserted into the buckle 6 for locking and positioning. This can effectively improve the overall production efficiency of the expansion valve.

[0021] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should fall within the protection scope of this utility model.

Claims

1. An integral injection-molded structure for an expansion valve, characterized in that: The device includes a coil and a valve body inserted within the coil. One end of the coil is connected to a circuit board, and the lower end of the circuit board is connected to a wire harness. The coil is covered by an injection-molded body, and the injection-molded body is provided with a buckle for fixing and positioning the valve body. The injection-molded body, the buckle, and the insulation of the wire harness are integrally formed. The buckle includes a buckle body, and the upper bottom end of the buckle body is provided with a bubble. The bubble includes a semi-circular protrusion, and both sides between the semi-circular protrusion and the upper bottom end of the buckle body form an arc transition surface.

2. The integral injection-molded structure of an expansion valve according to claim 1, characterized in that: The injection-molded body includes an injection-molded layer covering the coil, and an injection-molded sleeve covering the insulation of the circuit board and wire harness is provided on one side of the injection-molded layer. The upper end of the injection-molded sleeve is provided with the buckle.

3. The integral injection-molded structure of an expansion valve according to claim 2, characterized in that: The buckle body has a vertically bent structure, with its bottom end located at the upper end of the injection molded sleeve and its upper end extending above the injection molded body.

4. The integral injection-molded structure of an expansion valve according to claim 1, characterized in that: The buckle is positioned opposite to the wire harness.

5. The integral injection-molded structure of an expansion valve according to claim 2, characterized in that: The top of the injection-molded layer has a positioning groove on one side corresponding to the bottom of the buckle, which facilitates the assembly and insertion of the valve body. The gap is 0.1~0.6mm.

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