Voltage-resistant structure suitable for automobile filter

Abstract

The utility model discloses a voltage withstanding structure suitable for an automobile filter, comprising a housing, the housing is provided with a fixed cylinder used for line connection, the fixed cylinder is internally provided with a hollow hole site, the hollow hole site is internally provided with a plastic cap, the plastic cap covers the hollow hole site, and the plastic cap is provided with a plurality of through holes. A sampling connector is arranged on the bottom face of the shell corresponding to the area of the fixed column, the plastic cap comprises a cap base and a cap protrusion, the cap protrusion is arranged on the cap base, a blocking face is formed in the area, located on the periphery of the cap protrusion, of the cap base, a limiting wall is arranged on the periphery of the hollow hole, and the cap base is arranged in the hollow hole position. The blocking face is attached to the limiting wall, and the cap protrusion penetrates through the hollow hole position. Through the assembly of the plastic cap, the voltage resistance is improved, and the plastic cap is not easy to damage.

Description

Technical Field

[0001] This utility model relates to an automotive filter, specifically a voltage-resistant structure suitable for automotive filters. Background Technology

[0002] A filter is a basic microwave electronic device, consisting of a filtering circuit composed of capacitors, inductors, and resistors. Filters primarily come in planar microstrip form and cavity filter forms. Filters can effectively filter out specific frequencies or frequencies outside of a power supply line, resulting in a power signal of a specific frequency, or eliminating a power signal of a specific frequency.

[0003] In recent years, with the continuous increase in automotive functions and the ever-improving requirements for system reliability, DC power filters have been increasingly used in automotive electronic equipment. These filters need to come into contact with voltage and current, and automotive DC power filters must withstand high voltage and current at the sampling points of the wiring connections. Traditional filter sampling point structures lack effective protection and are easily affected by environmental factors when exposed to complex operating conditions for extended periods, leading to a decline in insulation performance. When vehicles operate in humid or dusty environments, exposed electrical connections may cause leakage or short circuits, resulting in distorted sampling signals or even equipment failure. If the filter does not have sufficient voltage withstand capability, it is easily damaged, leading to inaccurate and ineffective sampling. Utility Model Content

[0004] To address the aforementioned technical problems, this invention provides a voltage-resistant structure suitable for automotive filters.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A voltage-resistant structure suitable for automotive filters includes a housing, a fixing post for wiring connections on the housing, a hollow hole in the fixing post, a plastic cap installed in the hollow hole to cover the hollow hole, and a sampling connector on the bottom surface of the housing corresponding to the area of ​​the fixing post.

[0007] As a further improvement, the plastic cap includes a cap base and a cap protrusion. The cap protrusion is disposed on the cap base, and a blocking surface is formed in the area around the cap protrusion on the cap base. A limiting wall is provided around the hollow hole. The cap base is inserted into the hollow hole, and the blocking surface fits against the limiting wall. The cap protrusion passes through the hollow hole.

[0008] As a further improvement, the protrusion of the plastic cap is flush with the top end face of the fixing column.

[0009] As a further improvement, the inner wall of the hat base and the fixed column is a threaded assembly structure.

[0010] As a further improvement, the base of the plastic cap is provided with a tool holder, which is used to securely connect with a locking tool.

[0011] As a further improvement, the base of the plastic cap is hollow, and the tool holder is located inside the hollow.

[0012] As a further improvement, the base of the plastic cap is glued to the fixing column.

[0013] As a further improvement, the plastic cap has a feeding recess on the side wall of the cap base.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] By sealing and protecting the hollow holes with plastic caps and accurately positioning the sampling connectors, the voltage withstand performance at the circuit connection is effectively improved, preventing device damage and sampling failure due to insufficient voltage withstand, thereby ensuring the stable operation of the automotive electronic system. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is an exploded structural diagram of the present invention;

[0018] Figure 3 This is a three-dimensional structural diagram of the plastic cap in this utility model;

[0019] Figure 4 This is a cross-sectional structural diagram of the plastic cap in this utility model;

[0020] Figure 5 This is a schematic diagram of the plastic cap from another perspective in this utility model.

[0021] Figure label:

[0022] 1. Housing; 2. Fixed column; 3. Hollow hole; 4. Plastic cap; 41. Cap base; 42. Cap protrusion; 43. Blocking surface; 44. Feeding recess; 45. Tool slot; 46. Cavity; 5. Limiting wall; 6. Reinforcing rib. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that if terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0026] like Figure 1-5 As shown, a voltage-resistant structure suitable for automotive filters includes a housing 1, a fixed column 2 for wiring connection, a hollow hole 3 inside the fixed column 2, a plastic cap 4 installed inside the hollow hole 3 to cover the hollow hole 3, and a sampling connector correspondingly provided on the bottom surface of the housing 1 in the area of ​​the fixed column 2.

[0027] The fixed column 21 refers to a columnar connecting structure extending perpendicularly to the surface of the shell, which can be made of engineering plastic and is used to establish electrical connections and provide physical support. The hollow hole refers to a through-hole structure penetrating the interior of the fixed column, which can be achieved through drilling or injection molding, providing installation space for subsequent protective components. The plastic cap is an insulating cover, which can be injection molded from polyamide or polycarbonate materials, used to seal the opening of the hollow hole. The sampling connector is a conductive terminal located on the bottom surface of the shell, which can be made of copper alloy stamping, used to establish electrical connections with external circuits.

[0028] The fixed column 2 serves as the basic carrier for the wiring connection, and its hollow internal structure allows for the embedded installation of the plastic cap. During assembly, the plastic cap completely covers the opening of the hollow hole, forming a physical isolation layer. The sampling connector on the bottom surface of the housing maintains a perpendicular relationship with the fixed column, ensuring the shortest possible signal transmission path. When external cables are connected to the fixed column, the shielding effect of the plastic cap prevents foreign objects from entering the hollow hole, while its insulation properties block potential leakage paths.

[0029] A dual protection mechanism is implemented at the connection point: a fixed column forms the first mechanical barrier, while a plastic cap serves as the second insulating barrier. This layered protection design significantly improves the voltage withstand level of local areas while maintaining the reliability of the electrical connection.

[0030] The sealing effect of the plastic cap 4 maintains a dry environment for the connection structure, preventing insulation failure due to condensation. The spatial correspondence between the sampling connector and the fixed column optimizes signal transmission stability and ensures the accuracy of voltage sampling data. The overall structure achieves functional integration within a limited space, extending the filter's lifespan under harsh operating conditions.

[0031] The plastic cap 4 includes a cap base 41 and a cap protrusion 42. The cap protrusion 42 is disposed on the cap base 41. The area around the cap protrusion 42 on the cap base 41 forms a blocking surface 43. A limiting wall 5 is provided around the hollow hole 3. The cap base 41 is inserted into the hollow hole 3, and the blocking surface 43 is in contact with the limiting wall 5. The cap protrusion 42 passes through the hollow hole 3.

[0032] The hat base 41 refers to the main structure supporting the hat protrusion 42, which can be implemented using an injection-molded annular base. Its outer diameter matches the size of the hollow hole for assembly and positioning. The hat protrusion refers to a columnar structure extending from the center of the base, which can be implemented using a boss made of the same material as the base. Its height can be set to be flush with the top of the fixed column. The blocking surface refers to the planar area on the base surrounding the protrusion, which can be milled to form a flat contact surface for surface contact sealing with the limiting wall. The limiting wall refers to the annular stepped structure on the inner wall of the hollow hole, which can be turned to form a vertical stepped surface for limiting the axial displacement of the base.

[0033] Specifically, the plastic cap 4 is positioned and installed by the cooperation of the cap base 41 and the hollow hole 3. The blocking surface 43 on the outer edge of the cap base 41 fits tightly against the limiting wall 5 inside the hollow hole 3, preventing external liquids or dust from entering the hollow hole axially. The protruding part of the cap extends through the hollow hole to the outside of the fixed column, ensuring the wiring connection function while the contact surface between the cap base and the limiting wall forms a physical isolation barrier. During assembly, the cap base is pressed into the hollow hole until the blocking surface completely abuts against the limiting wall.

[0034] The tight fit between the cap base 41 and the limiting wall 5 creates a uniform pressure distribution, eliminating the risk of partial discharge and ensuring stable operation of the sampling connector under high pressure. The through-type design of the raised structure achieves sealing protection while fully preserving the function of the circuit connection channel.

[0035] In addition, the protrusion 42 of the plastic cap 4 is flush with the top end face of the fixed column 2. During the operation of the filter, the flush end face can evenly distribute the external pressure and prevent contaminants from entering the hollow hole from the gap.

[0036] This solution achieves a gapless fit between the protrusion and the top of the fixed column by precisely controlling the assembly dimensions, effectively improving voltage resistance.

[0037] The hat base 41 and the inner wall of the fixing column 2 are threaded together, which facilitates installation and disassembly.

[0038] A threaded assembly structure refers to a mechanical connection achieved through helical grooves, specifically using triangular or trapezoidal threads, with thread angles of 55 or 60 degrees. This structure uses axial pressure generated by rotational motion to secure the base to the column, effectively suppressing relative displacement between components in vibrating environments. The inner wall refers to the cylindrical surface inside the fixed column that contacts the cap base. This can be formed using injection molding or machining to create an internal thread structure, made of nylon or polyoxymethylene resin. The thread depth can range from 0.5 to 1.2 mm, and the thread lead from 1.5 to 3 mm.

[0039] Specifically, during assembly, the external thread of the cap base engages with the internal thread of the inner wall of the fixed column. By rotating clockwise, the base undergoes axial displacement along the thread lead until the threads are fully engaged and the preset torque value is reached. This helical propulsion method creates a continuous mechanical lock between the base and the column, providing a larger effective contact area compared to planar contact. In high-temperature operating environments, the threaded structure compensates for differences in material thermal expansion; for example, when the temperature rises and causes the nylon base to expand, the thread clearance absorbs the dimensional change.

[0040] The plastic cap 4 has a tool slot 45 in the cap base 41, which is used to lock and connect with a locking tool, such as a screwdriver or other tools, to improve the convenience of installation.

[0041] In addition, the base 41 of the plastic cap 4 has a cavity 46, and the tool holder 45 is located in the cavity 46.

[0042] A cavity refers to a hollow area formed inside the base of a hat. Specifically, it can be achieved by using injection molding to reserve a closed or semi-closed space inside the base of the hat. The cavity structure can provide space for tool holders while reducing the amount of material used.

[0043] A tool holder is a locking structure used to engage with a locking tool. It can be implemented using a polygonal groove, a cross groove, or an internal hexagonal groove. The tool holder is set inside a cavity, allowing the locking tool to extend into the cavity and form a stable contact with the holder.

[0044] Specifically, after a cavity is formed inside the cap base, a tool holder is integrated into the inner wall or bottom of the cavity. The locking tool can be inserted into the cavity and engage with the tool holder to apply rotational or axial force to install or remove the plastic cap. The depth and shape of the cavity can be adjusted according to the size of the tool holder; for example, the cavity depth can be slightly greater than the height of the tool holder to ensure that the tool does not interfere with the housing during operation.

[0045] The concealed layout of the tool holder avoids locking failure caused by foreign objects entering the holder. At the same time, the design of the cavity and the tool holder simplifies the installation process and improves the assembly stability between the plastic cap and the fixed column, thereby enhancing the overall reliability of the voltage-resistant structure.

[0046] Alternatively, the plastic cap can be fixed to the fixed column by using glue.

[0047] The plastic cap 4 has a feeding recess 44 on the side wall of the cap base 41. The feeding recess 44 refers to the recessed structure on the side wall surface of the cap base 41. Specifically, it can be implemented by an annular groove, a partial notch or a continuous corrugated groove, which is used to accommodate the flow of glue and form a uniformly distributed bonding path.

[0048] Specifically, when the adhesive is injected into the assembly gap between the cap base and the fixed column, the inlet recess provides a flow channel and storage space for the adhesive. Under capillary action, the adhesive spreads evenly along the recessed area of ​​the inlet recess, preventing uneven adhesive thickness due to localized accumulation and preventing adhesive overflow that could contaminate the top surface of the fixed column. By adjusting the depth and distribution density of the inlet recess, the coverage area of ​​the adhesive on the sidewall region can be controlled, ensuring complete coverage of the contact surface by the adhesive layer.

[0049] By setting feeding recesses on the sidewalls, the flow path of the adhesive is actively guided, eliminating the defect of uneven adhesive distribution and improving the stability and reliability of the bonding process.

[0050] This application ensures that the adhesive forms a continuous and uniformly thick sealing layer on the bonding surface between the cap base and the fixed column, avoiding poor electrical contact or reduced voltage resistance due to adhesive distribution defects. It also simplifies the operation of adhesive injection during assembly and improves production efficiency.

[0051] Furthermore, reinforcing ribs are incorporated between the fixed column and the housing. These ribs can be integrally formed with the housing using injection molding, and their thickness can be 0.5 to 1.5 times the housing wall thickness. By increasing the cross-sectional area of ​​the connection region, the reinforcing ribs can distribute the stress at the connection between the fixed column and the housing, preventing structural breakage due to vibration or external impact. This enhances the mechanical connection strength between the fixed column and the housing, preventing poor contact at the sampling connector due to structural fracture, thereby ensuring that the filter can stably transmit electrical signals and maintain its voltage withstand performance under complex automotive operating conditions.

[0052] Furthermore, by installing a plastic cap in the hollow cavity, the problem of material leakage during in-mold injection molding can be solved. During in-mold injection molding, the pre-formed plastic cap is first placed in a predetermined position within the mold. The component to be embedded is then placed inside the mold, and a column with a hollow cavity is mounted on the component, with the column area directly facing the plastic cap. After the mold is closed, the molding compound is injected. Because the hollow cavity is covered by the plastic cap, the compound will not enter the column, preventing material leakage.

[0053] It should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A voltage-resistant structure suitable for automotive filters, comprising a housing, characterized in that, The housing is provided with a fixed column for circuit connection. The fixed column has a hollow hole. A plastic cap is installed in the hollow hole and covers the hollow hole. A sampling connector is provided on the bottom of the housing corresponding to the area of ​​the fixed column.

2. The voltage-resistant structure for automotive filters according to claim 1, characterized in that, The plastic cap includes a cap base and a cap protrusion. The cap protrusion is disposed on the cap base. The area around the cap protrusion on the cap base forms a blocking surface. A limiting wall is provided around the hollow hole. The cap base is inserted into the hollow hole, and the blocking surface fits against the limiting wall. The cap protrusion passes through the hollow hole.

3. The voltage-resistant structure for automotive filters according to claim 2, characterized in that, The protrusion of the plastic cap is flush with the top end face of the fixed column.

4. The voltage-resistant structure for automotive filters according to claim 2, characterized in that, The hat base and the inner wall of the fixed column are connected by a threaded assembly structure.

5. The voltage-resistant structure for automotive filters according to claim 2, characterized in that, The plastic cap has a tool slot inside the cap base, which is used to lock the cap with a locking tool.

6. The voltage-resistant structure for automotive filters according to claim 5, characterized in that, The base of the plastic cap is hollow, and the tool holder is located inside the hollow.

7. The voltage-resistant structure for automotive filters according to claim 2, characterized in that, The base of the plastic cap is glued to the fixing column.

8. The voltage-resistant structure for automotive filters according to claim 7, characterized in that, The plastic cap has a feeding recess on the side wall of the cap base.

9. The voltage-resistant structure for automotive filters according to claim 1, characterized in that, The fixed column and the shell are integrally formed.

10. The voltage-resistant structure for automotive filters according to claim 1, characterized in that, The fixed column has reinforcing ribs between it and the shell.

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