A resistor with a resistance core centering function

Abstract

The utility model relates to resistance technical field provides a resistance with resistance core central function, including shell, the shell inside is established with the accommodating groove that extends along the axial, be equipped with resistance core in the accommodating groove, the resistance core with the inner wall of accommodating groove is filled with filling material between, both ends of resistance core all are equipped with the lead terminal, one end of lead terminal sets up accommodating groove outside, both ends of accommodating groove opening all are installed with the plug, the plug is established with the through -hole, the lead terminal passes through corresponding through -hole and extends to the outside of shell. In the utility model, through the symmetric axial thrust and limiting action of two end plugs to the lead terminal in the installation process, the automatic, accurate central positioning of resistance core in the accommodating groove is realized, and the problem of uneven distribution of filling material caused by resistance core eccentricity of traditional resistor is effectively solved.

Description

Technical Field

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

[0002] Resistors, as one of the most fundamental and indispensable components in electronic circuits, are widely used in various electrical devices, performing multiple functions such as current limiting, voltage division, and load control. With the development of modern electronic equipment towards miniaturization, high power density, and high reliability, the performance requirements for resistors are becoming increasingly stringent. Especially in high-power applications such as linear power supplies, motor drives, and power electronic converters, resistors generate a significant amount of Joule heat during operation. To ensure their long-term stable operation, they must possess efficient heat dissipation capabilities and a reliable mechanical structure.

[0003] However, traditional power resistor designs have several shortcomings. A common structure is to fix the resistor core directly to one end of the casing or suspend it via a bracket. This layout often results in the resistor core being off-center, leading to uneven distribution of the filler material between it and the inner wall of the casing. Furthermore, end caps or plugs used for sealing and electrode exit typically only provide a simple sealing function, lacking an active adjustment and precise positioning mechanism for the resistor core. This not only affects the efficiency of heat conduction from the resistor core to the casing but may also cause internal connections to loosen due to uneven stress or vibration. The purpose of this invention is to solve the problems of uneven distribution of filling material, low heat dissipation efficiency, and poor structural reliability caused by the eccentricity of the resistor core in traditional resistors. Utility Model Content

[0004] The purpose of this invention is to solve the problems of uneven distribution of filling material, low heat dissipation efficiency, and poor structural reliability caused by the eccentricity of the resistor core in traditional resistors. This invention adopts the following technical solution: A resistor with a centered resistive core includes a housing. An axially extending receiving groove is formed inside the housing. A resistive core is placed inside the receiving groove. A filler material is filled between the resistive core and the inner wall of the receiving groove. Both ends of the resistive core are provided with lead terminals. One end of the lead terminal is located outside the receiving groove. A plug is installed at both ends of the receiving groove. The plug has a through hole. The lead terminal passes through the corresponding through hole and extends to the outside of the housing.

[0005] As described above, a resistor with a centered resistive core has a groove on the side surface of the plug facing the receiving groove, and the groove communicates with the through hole.

[0006] As described above, a resistor with a centered resistive core has a rounded corner on the outer periphery of the plug facing the receiving groove.

[0007] As described above, a resistor with a centered resistive core has several equidistant protrusions on the outer peripheral sidewall of each plug, the protrusions being used for interference fit with the inner wall of the receiving groove.

[0008] As described above, a resistor with a centered resistive core has a plug made of ceramic material.

[0009] The resistor described above, which has a centered resistive core, uses quartz sand as the filling material.

[0010] As described above, a resistor with a centered resistive core has a plurality of axially extending heat dissipation fins on the outer peripheral wall of the housing, which are used to increase the heat exchange area between the housing and the external environment.

[0011] As described above, a resistor with a centered resistive core has an outer surface of its casing that is roughened by sandblasting.

[0012] Implementing the embodiments of this utility model has the following beneficial effects: 1. In this invention, by applying symmetrical axial thrust and limiting action to the lead terminals through the end plugs during installation, the automatic and precise centering of the resistor core within the receiving groove is achieved, effectively solving the problem of uneven distribution of filling material caused by the eccentricity of the resistor core in traditional resistors. This not only ensures that the filling material can be uniformly filled between the resistor core and the inner wall of the receiving groove, forming an efficient and consistent heat conduction path and significantly improving heat dissipation efficiency, but also makes the resistor core subjected to balanced force, enhancing the mechanical stability and electrical reliability of the product under vibration and impact environments, and effectively avoiding the risks of local overheating, stress concentration, and loose connections. Attached Figure Description

[0013] 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.

[0014] Figure 1 This is a schematic diagram of the overall structure of a resistor with a centered resistive core, according to this utility model.

[0015] Figure 2 This is an exploded view of a resistor with a centered resistive core according to this utility model.

[0016] Figure 3 This is a schematic diagram of the structure of a resistor plug with a resistor core centering function according to this utility model.

[0017] Figure 4 yes Figure 3 A structural diagram from another angle.

[0018] As shown in the figure: 1. Outer shell; 11. Receiving groove; 12. Heat dissipation fins; 2. Resistor core; 21. Lead terminal; 3. Plug; 31. Groove; 32. Through hole; 33. Protrusion. Detailed Implementation

[0019] 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.

[0020] like Figures 1 to 4 As shown, this utility model proposes a resistor with a centered resistive core, including a housing 1. An axially extending receiving groove 11 is formed inside the housing 1. A resistive core 2 is disposed within the receiving groove 11. A filler material is filled between the resistive core 2 and the inner wall of the receiving groove 11. Lead terminals 21 are provided at both ends of the resistive core 2, with one end of each lead terminal 21 located outside the receiving groove 11. A plug 3 is installed at each end of the receiving groove 11, and the plug 3 has a through hole 32. The lead terminal 21 passes through the corresponding through hole 32 and extends to the outside of the housing 1. During assembly, the resistive core 2 is first placed in the receiving groove 11 of the housing 1, and the lead terminals 21 connected to both ends of the resistive core 2 are aligned with the openings at both ends of the receiving groove 11. Then, the plugs 3 are installed from the openings at both ends, allowing the lead terminals 21 to pass through the through holes 32 on the plugs 3. As the two plugs 3 are gradually inserted and fixed, they form a dual radial and axial constraint on the lead terminal 21 through the through holes 32, and apply an axial thrust to the lead terminal 21 through their inner end faces. Under the symmetrical and synchronous pushing and limiting action of the two plugs 3, the resistor core 2 is forced to adjust and precisely position itself at the geometric center of the receiving groove 11, achieving automatic centering. This allows the filling material between the resistor core 2 and the inner wall of the receiving groove 11 to be evenly distributed, forming an efficient and consistent heat conduction path, significantly improving heat dissipation efficiency. At the same time, the resistor core 2 is subjected to balanced force, combined with the stable fixation of the lead terminal 21 within the through holes 32, greatly enhancing the mechanical and electrical reliability of the product under vibration and shock environments, effectively preventing local overheating, stress concentration, and loose connection problems caused by eccentricity.

[0021] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the plug 3 has a groove 31 on its surface facing the receiving groove 11, and the groove 31 communicates with the through hole 32. The groove 31 is used to abut against the end face of the resistor core 2. During assembly, when the plug 3 is installed at both ends of the receiving groove 11 of the housing 1, the lead terminals 21 connected to both ends of the resistor core 2 will pass through the through hole 32 on the plug 3. As the plug 3 is gradually inserted, the bottom surface of the groove 31 on its surface facing the receiving groove 11 will directly contact the end face of the resistor core 2 and apply an axial thrust. When the plugs 3 at both ends are pushed in synchronously, the bottom surfaces of the two grooves 31 work together to clamp and position the resistor core 2 from both sides, thereby precisely restricting it to the center position of the receiving groove 11.

[0022] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the outer periphery of the plug 3 facing the receiving groove 11 is provided with rounded corners. The rounded corners serve as guides, guiding the plug 3 smoothly and steadily into the receiving groove 11, avoiding jamming or damage caused by sharp edges.

[0023] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, each of the plugs 3 has a plurality of equidistantly distributed protrusions 33 on its outer peripheral sidewall. The protrusions 33 are used to make an interference fit with the inner wall of the receiving groove 11. During assembly, the protrusions 33 press tightly against the inner wall of the receiving groove 11, thereby forming an interference fit. The radial pressure and friction generated by this interference fit enable the plug 3 to be firmly fixed in the receiving groove 11, preventing it from loosening or falling off during use.

[0024] Optionally, in some embodiments, the plug 3 is made of ceramic material, which can give full play to the excellent electrical insulation, high temperature resistance and chemical stability of ceramic, effectively prevent leakage or short circuit between the lead terminal 21 and the outer casing 1 through the plug 3, and improve the electrical safety performance of the resistor.

[0025] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the filling material is quartz sand. Quartz sand is injected as the filling material into the receiving groove 11 of the outer shell 1, so that it tightly fills the space between the outer peripheral surface of the resistor core 2 and the inner wall of the receiving groove 11. The rigid structure formed by the accumulation of quartz sand particles provides all-around support and fixation for the resistor core 2, while its excellent thermal conductivity constitutes an efficient heat conduction path from the resistor core 2 to the outer shell 1.

[0026] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the outer peripheral wall of the outer shell 1 is provided with a plurality of axially extending heat dissipation fins 12, the heat dissipation fins 12 being used to increase the heat exchange area between the outer shell 1 and the external environment.

[0027] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the outer casing 1 is made of aluminum alloy. Aluminum alloy has excellent thermal conductivity, allowing heat to rapidly diffuse from the central region of the outer casing 1 to its entire outer surface, and then efficiently dissipate into the surrounding environment through natural convection.

[0028] Furthermore, as a preferred embodiment of the invention and not a limitation thereof, the outer surface of the housing 1 is a roughened surface formed by sandblasting. When the resistor is operating, the heat generated inside is conducted to its outer surface via the filling material and the body of the housing 1. The roughened surface formed by sandblasting increases the actual contact area between the housing 1 and the external air and changes the radiation characteristics of the surface, thereby enhancing the efficiency of heat dissipation to the surrounding environment through convection and radiation.

[0029] Example 1: This invention proposes a resistor with a centered resistive core, comprising a housing 1, an axially extending receiving groove 11 inside the housing 1, a resistive core 2 inside the receiving groove 11, and a filler material between the resistive core 2 and the inner wall of the receiving groove 11. Both ends of the resistive core 2 are provided with lead terminals 21, one end of which is located outside the receiving groove 11. A plug 3 is installed at each end opening of the receiving groove 11, and the plug 3 has a through hole 32 through which the lead terminal 21 passes and extends to the outside of the housing 1. During assembly, the resistive core 2 is first placed in the receiving groove 11 of the housing 1, and the lead terminals 21 connected to both ends of the resistive core 2 are aligned with the openings at both ends of the receiving groove 11. Then, the plugs 3 are installed from the openings at both ends, allowing the lead terminals 21 to pass through the through holes 32 on the plugs 3. As the two plugs 3 are gradually inserted and fixed, they form a dual radial and axial constraint on the lead terminal 21 through the through holes 32, and apply an axial thrust to the lead terminal 21 through their inner end faces. Under the symmetrical and synchronous pushing and limiting action of the two plugs 3, the resistor core 2 is forced to adjust and precisely position itself at the geometric center of the receiving groove 11, achieving automatic centering. This allows the filling material between the resistor core 2 and the inner wall of the receiving groove 11 to be evenly distributed, forming an efficient and consistent heat conduction path, significantly improving heat dissipation efficiency. At the same time, the resistor core 2 is subjected to balanced force, combined with the stable fixation of the lead terminal 21 within the through holes 32, greatly enhancing the mechanical and electrical reliability of the product under vibration and shock environments, effectively preventing local overheating, stress concentration, and loose connection problems caused by eccentricity.

[0030] A groove 31 is formed on the side of the plug 3 facing the receiving groove 11, and the groove 31 communicates with the through hole 32. The groove 31 is used to abut against the end face of the resistor core 2. During assembly, when the plug 3 is installed at both ends of the receiving groove 11 of the housing 1, the lead terminals 21 connected to both ends of the resistor core 2 will pass through the through hole 32 on the plug 3. As the plug 3 is gradually inserted, the bottom surface of the groove 31 on its side facing the receiving groove 11 will directly contact the end face of the resistor core 2 and apply axial thrust. When the plugs 3 at both ends are pushed in simultaneously, the bottom surfaces of the two grooves 31 work together to clamp and position the resistor core 2 from both sides, thereby precisely limiting it to the center position of the receiving groove 11. The outer periphery of the side of the plug 3 facing the receiving groove 11 is provided with rounded corners. The rounded corners serve as guides, guiding the plug 3 to enter the receiving groove 11 smoothly and steadily, avoiding jamming or damage caused by sharp edges. Each plug 3 has several equidistantly distributed protrusions 33 on its outer peripheral sidewall. These protrusions 33 are used for an interference fit with the inner wall of the receiving groove 11. During assembly, the protrusions 33 press tightly against the inner wall of the receiving groove 11, thus forming an interference fit. The radial pressure and friction generated by this interference fit ensure that the plug 3 is firmly fixed in the receiving groove 11, preventing it from loosening or falling off during use. The plug 3 is made of ceramic material, which can fully utilize the excellent electrical insulation, high temperature resistance, and chemical stability of ceramics, effectively preventing leakage or short circuit between the lead terminal 21 and the outer casing 1 through the plug 3, thereby improving the electrical safety performance of the resistor.

[0031] The filling material is quartz sand. Quartz sand is injected into the receiving groove 11 of the outer shell 1 as the filling material, so that it tightly fills the space between the outer peripheral surface of the resistive core 2 and the inner wall of the receiving groove 11. The rigid structure formed by the accumulation of quartz sand particles provides all-round support and fixation for the resistive core 2, while its good thermal conductivity forms an efficient heat conduction path from the resistive core 2 to the outer shell 1.

[0032] The outer peripheral wall of the housing 1 is provided with several axially extending heat dissipation fins 12, which are used to increase the heat exchange area between the housing 1 and the external environment. The outer surface of the housing 1 is a rough surface formed by sandblasting. When the resistor is working, the heat generated inside is conducted to its outer surface through the filling material and the housing 1 body. The rough surface formed by sandblasting increases the actual contact area between the housing 1 and the external air and changes the radiation characteristics of the surface, thereby enhancing the efficiency of heat dissipation to the surrounding environment through convection and radiation.

[0033] Specifically, the working principle of this invention is as follows: During resistor assembly, the resistor core 2 is first placed in the receiving groove 11 of the outer casing 1, with its two lead terminals 21 aligned with the openings at both ends of the receiving groove 11. Then, plugs 3 are installed from both ends, allowing the lead terminals 21 to pass through the through holes 32 on the plugs 3. As the two plugs 3 are gradually installed and secured, they form a dual radial and axial constraint on the lead terminals 21 through their through holes 32. The bottom surface of the groove 31 on the side of the plug 3 facing the receiving groove 11 directly abuts against the end face of the resistor core 2, applying an axial thrust. Under the symmetrical and synchronous pushing action of the plugs 3 at both ends, the resistor core 2 is forcibly adjusted and precisely positioned at the geometric center of the receiving groove 11, achieving automatic centering.

[0034] During this process, several equidistantly distributed protrusions 33 on the outer peripheral sidewall of the plug 3 form an interference fit with the inner wall of the receiving groove 11, ensuring that the plug 3 is firmly fixed and preventing loosening or falling off. Simultaneously, the outer peripheral edge of the plug 3 facing the receiving groove 11 has a rounded corner, which serves as a guide during assembly, guiding the plug 3 smoothly and steadily into the receiving groove 11, avoiding jamming or damage. The plug 3, made of ceramic material, not only provides reliable electrical insulation but also possesses excellent high-temperature resistance and chemical stability.

[0035] Quartz sand is tightly packed between the resistor core 2 and the inner wall of the receiving groove 11 as a filler material, providing mechanical support and forming a heat conduction path. The heat generated during operation is conducted through the quartz sand to the outer shell 1 made of aluminum alloy, and then through the heat dissipation fins 12 on the outer peripheral wall of the outer shell 1 and the roughened surface of the outer surface after sandblasting, which greatly increases the heat exchange area with the external environment. Thus, the heat is quickly dissipated through efficient convection and radiation, ensuring the stable and reliable operation of the resistor.

[0036] In summary, this invention solves the problems of uneven distribution of filling material, low heat dissipation efficiency, and poor structural reliability caused by the eccentricity of the resistor core in traditional resistors.

[0037] 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.

[0038] 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 a centered resistive core, comprising a housing (1), wherein an axially extending receiving groove (11) is provided inside the housing (1), a resistive core (2) is provided inside the receiving groove (11), a filling material is filled between the resistive core (2) and the inner wall of the receiving groove (11), and both ends of the resistive core (2) are provided with lead terminals (21), characterized in that, One end of the lead terminal (21) is located outside the receiving groove (11). A plug (3) is installed at both ends of the receiving groove (11). The plug (3) has a through hole (32). The lead terminal (21) passes through the corresponding through hole (32) and extends to the outside of the outer shell (1).

2. A resistor with a centered resistive core as described in claim 1, characterized in that, The plug (3) has a groove (31) on one side of its surface facing the receiving groove (11), and the groove (31) is connected to the through hole (32).

3. A resistor with a centered resistive core as described in claim 1, characterized in that, The outer periphery of the plug (3) facing the receiving groove (11) has rounded corners.

4. A resistor with a centered resistive core as described in claim 1, characterized in that, Each of the plugs (3) has a plurality of equally spaced protrusions (33) on its outer peripheral sidewall, the protrusions (33) being used to make an interference fit with the inner wall of the receiving groove (11).

5. A resistor with a centered resistive core as described in claim 1, characterized in that, The plug (3) is made of ceramic material.

6. A resistor with a centered resistive core as described in claim 1, characterized in that, The filling material is quartz sand.

7. A resistor with a centered resistive core as described in claim 1, characterized in that, The outer peripheral wall of the outer shell (1) is provided with a plurality of axially extending heat dissipation fins (12), which are used to increase the heat exchange area between the outer shell (1) and the external environment.

8. A resistor with a centered resistive core according to claim 1, characterized in that, The outer surface of the outer shell (1) is a rough surface formed by sandblasting.

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