A resistor with leakage prevention function

Abstract

The utility model relates to resistance technical field provides a resistance with leak protection function, including shell, install resistance core in the shell, the resistance core with the shell between fills and has filled material, one end of the shell is equipped with first baffle, the other end of the shell is equipped with second baffle, the outer periphery of first baffle with second baffle is equipped with sealed silica gel between the inner wall of shell. In the utility model, through setting up sealed silica gel between the outer periphery of first baffle and second baffle and the inner wall of shell, utilize its compressed deformation filling gap characteristic, effectively solved the medium invasion or filled material leakage problem that traditional resistance led to because end seal is not strict, significantly promoted the leakproof performance of product.

Description

Technical Field

[0001] This utility model relates to the field of resistor technology, and in particular to a resistor with leakage prevention function. Background Technology

[0002] Resistors, as one of the most fundamental components in electronic circuits, are widely used in current limiting, voltage division, and filtering applications. In harsh environments such as automotive electronics, industrial control, or outdoor equipment, resistors require excellent sealing performance to prevent moisture, dust, or other corrosive liquids from entering, thus ensuring their long-term stability and reliability. For this purpose, a structure is often used where the resistor core is encapsulated in a metal casing, and sealing is achieved by placing end plates.

[0003] However, traditional packaging structures often suffer from incomplete sealing. For example, if the fit between the endplate and the inner wall of the casing relies solely on a simple interference fit, tiny gaps can easily form due to machining tolerances, thermal expansion and contraction of materials, or mechanical vibration. These gaps can become channels for liquid or moisture to seep in, leading to degradation of the internal filler material, corrosion of the resistor core electrodes, and ultimately causing failure modes such as short circuits, open circuits, or resistance drift. Furthermore, the fixing method for the internal resistor core is relatively simple and lacks precise positioning. During potting, uneven stress can cause displacement, further affecting the overall sealing integrity and electrical performance.

[0004] The purpose of this invention is to solve the problems of poor leakage prevention and low reliability of traditional packaged resistors due to poor sealing of the sealing plate and inaccurate positioning of the resistor core. Utility Model Content

[0005] The purpose of this invention is to solve the problems of poor leakage prevention and low reliability caused by inadequate sealing of the sealing plate and inaccurate positioning of the resistor core in traditional packaged resistors. This invention adopts the following technical solution:

[0006] A resistor with leakage prevention function includes a housing, a resistor core installed inside the housing, a filler material between the resistor core and the housing, a first blocking plate at one end of the housing, a second blocking plate at the other end of the housing, a sealing silicone sealant between the outer periphery of the first and second blocking plates and the inner wall of the housing, and a base inside the housing. One side of the base has a groove that matches the shape of one end of the resistor core, and one end of the resistor core is inserted into and confined within the groove.

[0007] As described above, in a resistor with a leakage prevention function, the outer periphery of the base matches the cross-sectional shape of the inner cavity of the housing, and the groove is located at the center of the base.

[0008] As described above, a resistor with leakage prevention function has a base made of ceramic material.

[0009] As described above, a resistor with a leakage prevention function has a through hole on one side of the base, and the through hole is connected to the groove.

[0010] As described above, a resistor with leakage prevention function has a lead terminal connected to one end of the resistor core. The lead terminal passes through the second blocking plate and extends to the outside of the housing. The lead terminal is used to realize external electrical connection.

[0011] The resistor with leakage prevention function described above uses quartz sand as the filling material.

[0012] As described above, a resistor with leakage prevention function has a plurality of heat dissipation fins on the outer surface of the housing. The heat dissipation fins extend along the axial direction of the housing and are used to increase the heat dissipation area of ​​the housing.

[0013] As described above, the resistor with leakage prevention function has a housing made of aluminum alloy material in one piece.

[0014] As described above, in a resistor with a leakage prevention function, the second blocking plate has a through groove for the lead terminal to pass through, and the space between the lead terminal and the groove wall is filled with sealant.

[0015] Implementing the embodiments of this utility model has the following beneficial effects:

[0016] 1. In this utility model, by setting sealing silicone between the outer periphery of the first and second blocking plates and the inner wall of the outer shell, the characteristic of silicone to fill the gap under pressure deformation is utilized, which effectively solves the problem of dielectric intrusion or leakage of filling material caused by poor end sealing in traditional resistors, significantly improving the product's leak-proof performance. At the same time, by setting a groove on the base that matches the shape of one end of the resistor core, the resistor core can be accurately inserted and stably positioned, avoiding displacement caused by uneven force during potting, ensuring the stability and consistency of the internal structure, thereby improving the overall reliability and long-term working stability of the product. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a resistor with leakage prevention function according to this utility model.

[0019] Figure 2 yes Figure 1 A structural diagram from another angle.

[0020] Figure 3 This is an exploded view of a resistor with leakage prevention function according to this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of a base for a resistor with leakage prevention function according to this utility model.

[0022] As shown in the figure:

[0023] 1. Outer shell; 11. Heat dissipation fins; 2. First blocking plate; 3. Sealing silicone; 4. Second blocking plate; 5. Resistor core; 51. Lead terminal; 6. Base; 61. Groove; 62. Through hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figures 1 to 4 As shown, this utility model proposes a resistor with a leakage prevention function, including a shell 1, a resistor core 5 installed inside the shell 1, and a filler material between the resistor core 5 and the shell 1. One end of the shell 1 is provided with a first blocking plate 2, and the other end of the shell 1 is provided with a second blocking plate 4. A sealing silicone 3 is provided between the outer periphery of the first blocking plate 2 and the second blocking plate 4 and the inner wall of the shell 1. By utilizing the characteristic of silicone 3 to deform under pressure, the tiny gap between the blocking plate and the shell 1 is effectively filled, significantly improving the sealing performance of the end connection, preventing water vapor or liquid from entering the shell 1 from both ends, and also preventing the filler material from leaking out of the shell 1, thereby solving the problem of poor sealing in traditional resistor structures. The shell 1 is also provided with a base 6, and one side of the base 6 is provided with a groove 61 that matches the shape of one end of the resistor core 5. One end of the resistor core 5 is inserted into and confined within the groove 61. By setting a groove 61 on the base 6 that matches the shape of one end of the resistor core 5, the resistor core 5 is accurately positioned and stably limited, avoiding displacement caused by uneven force during potting and filling, ensuring the stability and consistency of the internal structure, and thus improving the overall leak-proof performance and long-term reliability of the product.

[0026] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the outer periphery of the base 6 matches the cross-sectional shape of the inner cavity of the outer shell 1. When the base 6 is installed inside the outer shell 1, the outer periphery of the base 6 can fit tightly against the inner wall of the outer shell 1, enhancing the mechanical stability of the overall structure. The groove 61 is located at the center of the base 6, so that one end of the resistor core 5 inserted therein is also located on the central axis of the base 6, avoiding uneven force or vibration offset caused by eccentricity, further improving the reliability of the resistor core 5 fixation and the consistency of the product.

[0027] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the base 6 is made of ceramic material, utilizing the excellent high-temperature resistance, high insulation, and high hardness properties of ceramics. This allows the base 6 to maintain structural stability in the high-temperature environment during resistor operation, preventing deformation or carbonization, thereby ensuring the long-term effective positioning of the groove 61 on the resistor core 5, and improving the electrical safety and long-term reliability of the product.

[0028] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, a through hole 62 is provided on one side of the base 6, and the through hole 62 is connected to the groove 61. The through hole 62 can serve as an exhaust channel during the insertion of the resistor core 5, helping to expel air from the groove 61 and preventing gaps. The presence of the through hole 62 reduces the amount of solid material used in the base 6, thereby reducing material costs and product weight while ensuring structural functionality.

[0029] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, one end of the resistor core 5 is connected to a lead terminal 51. The lead terminal 51 passes through the second blocking plate 4 and extends to the outside of the housing 1. The lead terminal 51 is used to realize external electrical connection. The second blocking plate 4 has a through groove for the lead terminal 51 to pass through. The space between the lead terminal 51 and the groove wall is filled with sealant, which effectively seals the potential leakage channel formed by the conductor passing through the housing, preventing water vapor or liquid from entering the interior of the housing 1 along the lead terminal 51. Thus, while ensuring electrical continuity, the overall structure's leak-proof performance and environmental adaptability are further improved.

[0030] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the filling material is silica sand. Silica sand has excellent thermal conductivity and low cost.

[0031] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the outer surface of the housing 1 is provided with a plurality of heat dissipation fins 11, which extend along the axial direction of the housing 1. The heat dissipation fins 11 are used to increase the heat dissipation area of ​​the housing 1, effectively improving the overall heat dissipation efficiency of the resistor and preventing performance degradation or damage due to overheating. The housing 1 is integrally formed from aluminum alloy material, ensuring structural strength and sealing reliability, so that heat can be efficiently and evenly conducted from the inside to the heat dissipation fins 11.

[0032] Example 1:

[0033] This invention proposes a resistor with a leakage-proof function, comprising a housing 1, a resistor core 5 installed inside the housing 1, and a filler material, namely quartz sand, between the resistor core 5 and the housing 1. Quartz sand has excellent thermal conductivity and low cost. One end of the housing 1 is provided with a first blocking plate 2, and the other end of the housing 1 is provided with a second blocking plate 4. A sealing silicone 3 is provided between the outer periphery of the first blocking plate 2 and the second blocking plate 4 and the inner wall of the housing 1. Utilizing the property of silicone 3 to deform under pressure, it effectively fills the tiny gaps between the blocking plate and the housing 1, significantly improving the sealing performance at the end connection, preventing water vapor or liquid from entering the housing 1 from both ends, and also preventing the filler material from leaking out of the housing 1, thereby solving the problem of poor sealing in traditional resistor structures. The housing 1 is also provided with a base 6, and one side of the base 6 is provided with a groove 61 that matches the shape of one end of the resistor core 5. One end of the resistor core 5 is inserted into and confined within the groove 61. By setting a groove 61 on the base 6 that matches the shape of one end of the resistor core 5, the resistor core 5 is accurately positioned and stably limited, avoiding displacement caused by uneven force during potting and filling, ensuring the stability and consistency of the internal structure, and thus improving the overall leak-proof performance and long-term reliability of the product.

[0034] The outer periphery of the base 6 matches the cross-sectional shape of the inner cavity of the outer shell 1. When the base 6 is installed inside the outer shell 1, its outer periphery fits tightly against the inner wall of the outer shell 1, enhancing the mechanical stability of the overall structure. The groove 61 is located at the center of the base 6, ensuring that one end of the inserted resistor core 5 is also located on the central axis of the base 6, preventing uneven force distribution or vibration shift caused by eccentricity, and further improving the reliability of the resistor core 5 fixation and the consistency of the product. The base 6 is made of ceramic material, utilizing the excellent high-temperature resistance, high insulation, and high hardness properties of ceramics. This allows the base 6 to maintain structural stability in the high-temperature environment during resistor operation, preventing deformation or carbonization, thus ensuring the long-term effective limiting of the resistor core 5 by the groove 61, improving the electrical safety and long-term reliability of the product. A through hole 62 is provided on one side of the base 6, which is connected to the groove 61. The through hole 62 serves as an exhaust channel during the insertion of the resistor core 5, helping to expel air from the groove 61 and preventing gaps. The presence of through hole 62 reduces the amount of solid material used in base 6, thereby reducing material costs and product weight while ensuring structural functionality.

[0035] One end of the resistor core 5 is connected to a lead terminal 51. The lead terminal 51 passes through the second blocking plate 4 and extends to the outside of the housing 1. The lead terminal 51 is used to realize external electrical connection. The second blocking plate 4 has a through groove for the lead terminal 51 to pass through. The space between the lead terminal 51 and the groove wall is filled with sealant, which effectively seals the potential leakage channel formed by the conductor passing through the housing, preventing water vapor or liquid from entering the interior of the housing 1 along the lead terminal 51. Thus, while ensuring electrical continuity, it further improves the leakage prevention performance and environmental adaptability of the overall structure.

[0036] The outer surface of the housing 1 is provided with several heat dissipation fins 11, which extend along the axial direction of the housing 1. The heat dissipation fins 11 are used to increase the heat dissipation area of ​​the housing 1, effectively improving the overall heat dissipation efficiency of the resistor and preventing performance degradation or damage due to overheating. The housing 1 is integrally formed from aluminum alloy material, which ensures structural strength and sealing reliability, so that heat can be efficiently and evenly conducted from the inside to the heat dissipation fins 11.

[0037] Specifically, the working principle of this invention is as follows:

[0038] The outer contour of the base 6 is designed to match the cross-sectional shape of the inner cavity of the outer shell 1, ensuring that it fits tightly against the inner wall of the outer shell 1 after installation. One end of the resistor core 5 is inserted into the groove 61 at the center of the base 6 for precise mechanical positioning. The through hole 62 serves as an exhaust channel during this process, allowing air to escape and preventing the formation of air bubbles. A sealing silicone 3 is applied between the outer periphery of the first blocking plate 2 and the second blocking plate 4 and the inner wall of the outer shell 1. The sealing silicone 3 effectively fills the tiny gaps between the blocking plates and the outer shell 1, significantly improving the sealing performance at the end connection and preventing moisture or liquid from entering the outer shell 1 from both ends, while also preventing the filling material from leaking out of the outer shell 1.

[0039] When the filler material is quartz sand, its particles are distributed around the resistor core 5. The other end of the resistor core 5 is connected to a lead terminal 51, which passes through a slot on the second blocking plate 4 and extends to the outside of the housing 1. Sealant is filled between the lead terminal 51 and the slot wall and cured to form a reliable local seal, thereby constructing a complete external electrical connection path.

[0040] The heat generated during resistor operation is primarily produced by the resistive core 5. This heat is conducted directly to the surrounding quartz sand filling material. Since the outer casing 1 is integrally formed from a thermally conductive aluminum alloy, heat is efficiently conducted from the interior to the outer surface of the casing 1. Finally, the heat is exchanged with the outside air through convection and radiation via multiple axially extending heat dissipation fins 11. Due to the significantly increased surface area, the heat dissipation efficiency is greatly improved, thus ensuring the resistor's temperature stability and electrical performance reliability during long-term operation.

[0041] In summary, this invention solves the problems of poor leakage prevention and low reliability caused by inadequate sealing of the sealing plate and inaccurate positioning of the resistor core in traditional packaged resistors.

[0042] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., 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. Therefore, they should not be construed as limitations on this utility model.

[0043] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A resistor with leakage prevention function, comprising a housing (1), wherein a resistor core (5) is installed inside the housing (1), and a filler material is filled between the resistor core (5) and the housing (1), characterized in that, One end of the outer shell (1) is provided with a first blocking plate (2), and the other end of the outer shell (1) is provided with a second blocking plate (4). The outer periphery of the first blocking plate (2) and the second blocking plate (4) is provided with a sealing silicone (3) between them and the inner wall of the outer shell (1). The outer shell (1) is also provided with a base (6). One side of the base (6) is provided with a groove (61) that matches the shape of one end of the resistor core (5). One end of the resistor core (5) is inserted into and confined within the groove (61).

2. A resistor with leakage prevention function according to claim 1, characterized in that, The outer periphery of the base (6) matches the cross-sectional shape of the inner cavity of the outer shell (1), and the groove (61) is located at the center of the base (6).

3. A resistor with leakage prevention function according to claim 1, characterized in that, The base (6) is made of ceramic material.

4. A resistor with leakage prevention function according to claim 1, characterized in that, The base (6) has a through hole (62) on one side, and the through hole (62) is connected to the groove (61).

5. A resistor with leakage prevention function according to claim 1, characterized in that, One end of the resistor core (5) is connected to a lead terminal (51), which passes through the second blocking plate (4) and extends to the outside of the housing (1). The lead terminal (51) is used to realize external electrical connection.

6. A resistor with leakage prevention function according to claim 1, characterized in that, The filling material is quartz sand.

7. A resistor with leakage prevention function according to claim 1, characterized in that, The outer surface of the outer shell (1) is provided with a plurality of heat dissipation fins (11), which extend along the axial direction of the outer shell (1) and are used to increase the heat dissipation area of ​​the outer shell (1).

8. A resistor with leakage prevention function according to claim 1, characterized in that, The outer shell (1) is integrally formed from aluminum alloy material.

9. A resistor with leakage prevention function according to claim 5, characterized in that, The second blocking plate (4) has a through groove for the lead terminal (51) to pass through, and the space between the lead terminal (51) and the groove wall is filled with sealant.

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