Plastic encapsulated solenoid valve coil

Abstract

The utility model discloses a kind of plastic package type solenoid valve coils, including package shell, support frame, skeleton and coil group, skeleton is I-shaped structure, and its winding post is wound with coil group.Support frame is integrally formed with the C-shaped structure of the mounting sheet of two ends and the connecting sheet of bottom. The key innovation of the present application is that the package shell is integrally formed on the outer side of support frame and skeleton using plastic package pressure casting process, which completely covers and combines into a solid whole. Preferably, the material of the package shell is epoxy resin, and the support frame is made of metal material. The connecting sheet has wire holes for the wires to pass through. This structure completely solves the problems of poor sealing, poor heat dissipation, and easy bubble generation of traditional split type coils. It realizes absolute sealing, high-efficiency heat dissipation, high mechanical strength, and excellent vibration resistance, significantly improving the reliability and service life of the solenoid valve coil in harsh environments.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valve technology, specifically to a plastic-encapsulated solenoid valve coil. Background Technology

[0002] Solenoid valves, as key actuators in fluid control systems, are widely used in home appliances, the automotive industry, medical equipment, industrial automation, and other fields. The solenoid valve coil is the core driving component of the solenoid valve, and its performance directly affects the reliability, lifespan, and safety of the entire solenoid valve.

[0003] Traditional solenoid valve coils mainly use the following two packaging forms: 1. Plastic-encased type: In this type of coil, the enameled wire-wound bobbin is first mounted on a plastic base, and then an outer plastic shell is placed over it. The shell and base are usually fixed together by clips, screws, or ultrasonic welding. The disadvantage of this structure is that gaps exist at the joints, resulting in poor sealing. Under harsh conditions such as humidity, oil, and corrosive gases, moisture and contaminants can easily penetrate the coil, leading to corrosion of the enameled wire, decreased insulation performance, and even short circuits and burnout. Furthermore, the multi-layered structure increases thermal resistance, making it difficult to dissipate heat quickly during operation, resulting in a higher temperature rise and affecting the coil's power and lifespan.

[0004] 2. Encapsulated Type: To address the sealing issue, coils encapsulated with materials such as epoxy resin have emerged. While encapsulated coils offer improved sealing and moisture resistance, their manufacturing process is complex. Improper control of factors such as the fluidity of the encapsulating material and curing time can easily lead to air bubbles, creating localized thermal defects or stress concentration points. Furthermore, the thermal conductivity of encapsulating materials is typically limited, resulting in unsatisfactory overall heat dissipation. Additionally, the encapsulation process struggles to provide robust structural support for the internal framework and pins, potentially leading to loosening of the internal structure under vibration or impact. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems by providing a plastic-encapsulated solenoid valve coil.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a plastic-encapsulated solenoid valve coil, including an encapsulated shell, a support frame, a frame, and a coil assembly; The frame is an I-shaped structure, and the coil group is wound on its winding post; The support frame includes two mounting pieces at both ends and a connecting piece connecting the bottom of the two mounting pieces. The mounting pieces and the connecting piece are integrally formed to form a C-shaped structure. The skeleton is mounted on the support frame, and the encapsulating shell is integrally formed on the outside of the support frame and the skeleton through a plastic sealing die-casting process.

[0007] Furthermore, the connecting piece has a wire hole for the power supply wire to pass through.

[0008] Furthermore, a positioning protrusion is provided on one side of the bottom of the frame, and a positioning groove is provided on the mounting plate to cooperate with the positioning protrusion.

[0009] Furthermore, the encapsulating shell is made of epoxy resin.

[0010] Furthermore, the support frame is made of metal.

[0011] The advantages of this invention compared to existing technologies are as follows: Through the innovative process of integrated molding and die-casting, the encapsulation shell, metal support frame, skeleton, and coil assembly are solidified into a seamless integral structure, thereby comprehensively solving the inherent defects of traditional coils. The integrated encapsulation shell achieves absolute sealing, eliminating the path for moisture and contaminants to intrude, enabling it to withstand harsh working conditions. This structure also creates a highly efficient dual-path heat dissipation mechanism, where the encapsulation material directly fills the coil turns, eliminating air thermal resistance, and works in conjunction with the metal support frame to conduct heat, significantly improving heat dissipation efficiency and effectively reducing operating temperature rise. In addition, the integral structure gives the coil extremely high mechanical strength and vibration resistance, preventing internal components from loosening, and the production process is easy to automate, ensuring product consistency and high reliability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a plastic-encapsulated solenoid valve coil according to this utility model. Detailed Implementation

[0013] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0014] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; for those skilled in the art, the specific meaning of the above term in this utility model can be understood according to the specific circumstances.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to this description.

[0016] A plastic-encapsulated solenoid valve coil includes an encapsulated housing 1, a support frame 2, a frame 3, and a coil assembly 4. These four components are not simply stacked together, but are integrated into a robust whole through ingenious structural design and advanced manufacturing processes.

[0017] In this embodiment, the frame 3 serves as the carrier of the coil assembly 4 and adopts an I-shaped structure. This structure has a central winding post and baffles at both ends, which has the advantage of ensuring winding space while effectively preventing the coil assembly 4 from loosening during winding and use. The coil assembly 4 is made of insulated enameled wire tightly wound around the winding post of the frame 3, forming the core part that generates electromagnetic force.

[0018] In this embodiment, the support frame 2 features an ingenious design. It is integrally formed into a robust C-shaped structure by two mounting plates 21 located at both ends and a connecting plate 22 connecting the bottom of the two mounting plates 21. This C-shaped structure acts as an "internal skeletal framework." Its primary function is mechanical support and installation fixation. Mounting holes 212 can be provided on the mounting plates 21 for securely mounting the entire coil assembly to the solenoid valve body. More importantly, the metal support frame 2 is a highly efficient heat conduction path. The heat generated when the coil assembly 3 is working can be dissipated outward through the encapsulated shell 1, and can also be directly conducted to the support frame 2, which is in close contact with it. Then, it is quickly transferred to the metal valve body of the solenoid valve through its large-area mounting plates 21. The valve body acts as a huge "heat sink," greatly improving the overall heat dissipation efficiency and effectively reducing the steady-state operating temperature of the coil.

[0019] The precise positioning of the frame 3 and the support frame 2 is crucial for ensuring structural accuracy. A positioning protrusion 31 is located on one side of the bottom of the frame 3, while a precisely fitted positioning groove 211 is provided on the mounting plate 21 of the support frame 2. During assembly, the engagement of the protrusion 31 and the groove 211 enables rapid and accurate positioning of the frame 3 on the support frame 2, preventing displacement during subsequent molding and ensuring product consistency and reliability.

[0020] Assembly steps: Place the frame 3 with the coil assembly 4 wound onto the support frame 2. Ensure that the positioning protrusion 31 at the bottom of the frame 3 is accurately inserted into the positioning groove 211 on the mounting plate 21 of the support frame 2. This step ensures that the frame 3 is circumferentially and radially positioned on the support frame 2, preventing it from rotating or moving. Pass the lead wires of the coil assembly 4 through the wire hole 221 on the connecting plate 22 of the support frame 2;

[0021] After the assembled frame 3, including the coil assembly 4, is precisely placed on the support frame 2, the entire assembly is placed into a specialized mold. Under high temperature and pressure, molten epoxy resin and other encapsulating materials are injected into the mold cavity. The material fills the interior of the frame 3, the spaces between the coil turns, and every gap in the support frame 2. Subsequently, the material rapidly solidifies, and the mold is opened to remove the finished product. At this point, the epoxy resin has formed a hard and dense encapsulating shell 1, inseparably combining the support frame 2, frame 3, and coil assembly 4 into a complete solenoid valve coil assembly. The lead wires are securely sealed at the wire hole 221. Necessary electrical performance tests, such as resistance, insulation withstand voltage tests, and visual inspections, are performed on the finished product.

[0022] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A plastic-encapsulated solenoid valve coil, characterized in that: It includes an encapsulation shell (1), a support frame (2), a frame (3), and a coil assembly (4); The skeleton (3) is an I-shaped structure, and the coil group (4) is wound on its winding post. The support frame (2) includes two mounting pieces (21) located at both ends and a connecting piece (22) connecting the bottom of the two mounting pieces (21). The mounting pieces (21) and the connecting piece (22) are integrally formed to form a C-shaped structure. The skeleton (3) is set on the support frame (2), and the encapsulation shell (1) is integrally formed on the outside of the support frame (2) and the skeleton (3) by a plastic sealing die casting process.

2. The encapsulated solenoid valve coil according to claim 1, characterized in that: The connecting piece (22) has a wire hole (221) for the power supply wire to pass through.

3. The encapsulated solenoid valve coil according to claim 1, characterized in that: The bottom side of the frame (3) is provided with a positioning protrusion (31), and the mounting plate (21) is provided with a positioning groove (211) that cooperates with the positioning protrusion (31).

4. The encapsulated solenoid valve coil according to claim 1, characterized in that: The encapsulation shell (1) is made of epoxy resin.

5. The encapsulated solenoid valve coil according to claim 1, characterized in that: The support frame (2) is made of metal.

Images