Winding resistor with adjustable welding angle

Abstract

The utility model discloses a winding resistor with an adjustable welding angle, which comprises a ceramic core column, metal end caps are arranged at two ends of the ceramic core column, a resistance wire is wound on the surface of the ceramic core column, two ends of the resistance wire are respectively welded with the metal end caps, and an insulating shell is encapsulated outside the metal end caps, the resistance wire and the ceramic core column. Metal rods are arranged on the outer end faces of the two metal end caps, and the ends, away from the ceramic core column, of the metal rods penetrate out of the insulating shell and are connected with leads through rotating parts. According to the utility model, the conductivity of electrical connection between the lead and the resistor caused by direct bending of the lead can be avoided, the use effect of the resistor is ensured, and the normal operation of the whole circuit is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of wire-wound resistors, and particularly relates to a wire-wound resistor with an adjustable welding angle. Background Art

[0002] Wire-wound resistors are widely used in low-frequency precision instruments due to their high temperature resistance, high precision, and high power.

[0003] Hard metal leads are provided at both ends of the wire-wound resistor, and the leads are fixed at corresponding positions on a substrate (PCB board) by welding. When welding the resistor on the substrate, the space is relatively narrow. To facilitate the welding of the resistor, the resistor needs to be rotated to a certain position, which will affect the installation of other components after rotation. Therefore, on the basis of not changing the designed position of the resistor, the leads can be bent for welding and fixing. However, the leads are generally hard, and bending them easily affects the electrical connection between the leads and the resistor, thereby affecting the use effect of the resistor and causing problems in the entire circuit. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a wire-wound resistor with an adjustable welding angle, to avoid the conductivity of the electrical connection between the lead and the resistor when bending the lead, ensure the use effect of the resistor, and ensure the normal operation of the entire circuit.

[0005] To solve the above technical problems, the utility model adopts the following solutions:

[0006] A wire-wound resistor with an adjustable welding angle includes a ceramic core column. Metal end caps are provided at both ends of the ceramic core column. A resistance wire is wound on the surface of the ceramic core column. Both ends of the resistance wire are respectively welded to the metal end caps. The metal end caps, the resistance wire, and the ceramic core column are encapsulated by an insulating shell. Metal rods are provided on the outer end faces of the two metal end caps. One end of the metal rod far from the ceramic core column extends out of the insulating shell. One end of the metal rod located in the insulating shell is connected to a lead through a rotating part.

[0007] Due to the adoption of the above technical solution, the ceramic core column serves as the main support structure of the resistor, having high insulation and good thermal stability. The metal end caps are located at both ends of the ceramic core column, used to fix the resistance wire and serve as the electrical connection points of the resistor. The resistance wire is wound around the surface of the ceramic core column, which is the main component of the resistor and is used to provide the required resistance value. The insulating housing completely encapsulates the metal end caps, the resistance wire, and the ceramic core column, providing electrical isolation and mechanical protection. The metal rod extends from the outer end face of the metal end cap and passes through the insulating housing to serve as an electrical connection point. The rotating part is the part connecting the metal rod and the lead, allowing the adjustment of the welding angle. The lead is connected to the rotating part and is used to connect the resistor to the external circuit. By rotating the rotating part, the angle between the metal rod and the lead can be adjusted to adapt to different welding or installation requirements. High insulation: The ceramic core column and the insulating housing provide good electrical isolation, ensuring the safe use of the resistor. By adjusting the welding angle, this resistor can adapt to various complex installation environments, improving the flexibility and convenience of use. Rotating the lead can adjust the welding angle, avoiding the conductivity of the electrical connection between the lead and the resistor when directly bending the lead, ensuring the use effect of the resistor and guaranteeing the normal operation of the entire circuit.

[0008] Optionally, the rotating part includes a rotating seat and a rotating ball. The rotating seat is connected to the end of the metal rod away from the ceramic core column, and the rotating ball is movably connected to the rotating seat. The rotating ball is fixedly connected to one end of the lead.

[0009] Optionally, a rotating cavity adapted to the rotating ball is provided inside the rotating seat, and an opening communicating with the rotating cavity is provided on the surface of the rotating seat. The diameter of the opening is smaller than the diameter of the rotating ball.

[0010] Optionally, a filling cavity is formed between the insulating housing and the ceramic core column, and a moisture-proof layer is provided in the filling cavity.

[0011] Optionally, a flame-retardant layer is provided between the moisture-proof layer and the ceramic core column.

[0012] Optionally, there are two resistance wires, and the two resistance wires are wound around the ceramic core column in a bidirectional reverse spiral.

[0013] Optionally, protrusions are provided on both sides of the bottom of the insulating housing, and an upward groove is formed between the protrusions.

[0014] Optionally, a thermal conductive silicone grease layer is filled in the groove.

[0015] Optionally, the depth of the groove is 0.5 mm.

[0016] The beneficial effects of the present utility model are:

[0017] 1. In this utility model, the ceramic core column serves as the main support structure of the resistor, having high insulation and good thermal stability. Metal end caps are located at both ends of the ceramic core column, used to fix the resistance wire and serve as the electrical connection points of the resistor. The resistance wire is wound around the surface of the ceramic core column and is the main component of the resistor, used to provide the required resistance value. The insulating shell completely encapsulates the metal end caps, the resistance wire, and the ceramic core column, providing electrical isolation and mechanical protection. The metal rod extends from the outer end face of the metal end cap and passes through the insulating shell to serve as an electrical connection point. The rotating part is the part connecting the metal rod and the lead, allowing adjustment of the welding angle. The lead is connected to the rotating part and is used to connect the resistor to the external circuit. By rotating the rotating part, the angle between the metal rod and the lead can be adjusted, so as to adapt to different welding or installation requirements. High insulation: The ceramic core column and the insulating shell provide good electrical isolation, ensuring the safe use of the resistor. By adjusting the welding angle, this resistor can adapt to various complex installation environments, improving the flexibility and convenience of use. Rotating the lead can adjust the welding angle, avoiding the conductivity of the electrical connection between the lead and the resistor when directly bending the lead, ensuring the use effect of the resistor and guaranteeing the normal operation of the entire circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the rotating seat.

[0020] Reference numerals: 1 - insulating shell, 2 - moisture-proof layer, 3 - flame-retardant layer, 4 - end cap, 5 - filling cavity, 6 - resistance wire, 7 - ceramic core column, 8 - rotating seat, 9 - metal rod, 10 - rotating ball, 11 - lead, 12 - rotating cavity, 13 - opening, 14 - protrusion, 15 - groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will further describe the present utility model in detail in conjunction with the embodiments and the drawings, but the embodiments of the present utility model are not limited thereto.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "provided with", "installed", "connected", "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Embodiment

[0025] An adjustable-welding-angle wirewound resistor includes a ceramic core column 7. Metal end caps 4 are arranged at both ends of the ceramic core column 7. A resistance wire 6 is wound around the surface of the ceramic core column 7. Both ends of the resistance wire 6 are respectively welded to the metal end caps 4. An insulating shell 1 encapsulates the outside of the metal end caps 4, the resistance wire 6 and the ceramic core column 7. Metal rods 9 are arranged on the outer end faces of the two metal end caps 4. One end of the metal rod 9 far away from the ceramic core column 7 extends out of the insulating shell 1. One end of the metal rod 9 located inside the insulating shell 1 is connected with a lead wire 11 through a rotating part.

[0026] In this embodiment, as Figure 1 shown, the ceramic core column 7 serves as the main supporting structure of the resistor, having high insulation and good thermal stability. The ceramic core column 7 is in a cylindrical structure. The metal end caps 4 are located at both ends of the ceramic core column 7, used for fixing the resistance wire 6 and serving as the electrical connection points of the resistor. The resistance wire 6 is wound around the surface of the ceramic core column 7 and is the main component of the resistor, used for providing the required resistance value. The insulating shell 1 completely encapsulates the metal end caps 4, the resistance wire 6 and the ceramic core column 7, providing electrical isolation and mechanical protection. The metal rod 9 extends out from the outer end face of the metal end cap 4 and passes through the insulating shell 1, serving as an electrical connection point. The rotating part is the part connecting the metal rod 9 and the lead wire 11, allowing the adjustment of the welding angle. The lead wire 11 is connected with the rotating part and is used for connecting the resistor with an external circuit. By rotating the rotating part, the angle between the metal rod 9 and the lead wire 11 can be adjusted, so as to adapt to different welding or installation requirements. High insulation: The ceramic core column 7 and the insulating shell 1 provide good electrical isolation, ensuring the safe use of the resistor. By adjusting the welding angle, this resistor can adapt to various complex installation environments, improving the flexibility and convenience of use. Rotating the lead wire 11 can adjust the welding angle, avoiding the conductivity of the electrical connection between the lead wire 11 and the resistor when directly bending the lead wire 11, ensuring the use effect of the resistor and guaranteeing the normal operation of the whole circuit.

[0027] Further, the rotating part includes a rotating seat 8 and a rotating ball 10. The rotating seat 8 is connected with one end of the metal rod 9 far away from the ceramic core column 7. The rotating ball 10 is movably connected with the rotating seat 8. The rotating ball 10 is fixedly connected with one end of the lead wire 11.

[0028] Specifically, as Figure 1 shown, the rotating seat 8 is connected to one end of the metal rod 9 away from the ceramic core column 7. Its main function is to serve as the connection point between the metal rod 9 and the rotating ball 10, and at the same time provide stable support for the rotating ball 10. The rotating seat 8 is usually made of a material with good mechanical strength and wear resistance to ensure stable performance during long-term use. At the same time, it also has conductivity. The rotating ball 10 is movably connected to the rotating seat 8 through a certain structure, enabling the rotating ball 10 to freely rotate within a certain range. One end of the rotating ball 10 is fixedly connected to the lead 11. This fixed connection can be achieved by welding to ensure that the lead 11 and the rotating ball 10 do not separate during rotation. When the welding angle needs to be adjusted, the relative angle between the rotating ball 10 and the metal rod 9 can be changed by rotating the rotating ball 10. The metal rod 9 can be made of copper or other alloy materials. Due to the movable connection between the rotating ball 10 and the rotating seat 8, this rotation is smooth and adjustable. At the same time, due to the fixed connection between the rotating ball 10 and the lead 11, the direction of the lead 11 also changes with the rotation of the rotating ball 10, thus achieving the adjustment of the welding angle. By rotating the rotating ball 10, the welding angle can be easily adjusted to meet different installation and welding requirements without directly bending the lead 11, avoiding the disconnection of the electrical connection between the lead 11 and the resistor. The movable connection structure between the rotating seat 8 and the rotating ball 10 is reasonably designed to ensure stability and reliability during rotation.

[0029] Furthermore, a rotating cavity 12 adapted to the rotating ball 10 is provided inside the rotating seat 8, and an opening 13 communicating with the rotating cavity 12 is provided on the surface of the rotating seat 8. The diameter of the opening 13 is smaller than the diameter of the rotating ball 10.

[0030] Specifically, as Figure 2As shown, the rotating cavity 12 is located inside the rotating seat 8 and is adapted to the rotating ball 10. The shape and size of the rotating cavity 12 match those of the rotating ball 10 to ensure that the rotating ball 10 can rotate smoothly therein. The rotating cavity 12 provides a space for the rotating ball 10 to rotate freely, enabling the adjustment of the welding angle. The opening 13 is located on the surface of the rotating seat 8 and is connected to the rotating cavity 12. The opening 13 reserves sufficient space for the angle adjustment of the lead 11. The diameter of the opening 13 is smaller than that of the rotating ball 10. This design is to ensure that the rotating ball 10 will not fall off from the opening 13 during rotation. At the same time, it also provides a certain constraint for the rotating ball 10, making it more stable during rotation. When the welding angle needs to be adjusted, the relative angle between the rotating ball 10 and the metal rod 9 can be changed by rotating the rotating ball 10. Due to the movable connection between the rotating ball 10 and the rotating seat 8, this rotation is smooth and adjustable. The rotating ball 10 is fixedly connected to one end of the lead 11. Therefore, the direction of the lead 11 will also change with the rotation of the rotating ball 10, thus realizing the adjustment of the welding angle.

[0031] Furthermore, a filling cavity 5 is formed between the insulating housing 1 and the ceramic core column 7, and a moisture-proof layer 2 is provided in the filling cavity 5.

[0032] Specifically, as Figure 1 shown, the filling cavity 5 is located between the insulating housing 1 and the ceramic core column 7. It is a space surrounded by the insulating housing 1 but not occupied by internal components such as the resistance wire 6 and the metal end cap 4. The main function of the filling cavity 5 is to provide a space for placing the moisture-proof layer 2 or other filling materials to enhance the moisture-proof performance of the resistor. The moisture-proof layer 2 is located in the filling cavity 5 and covers the outside of the ceramic core column 7. The moisture-proof layer 2 is usually made of materials with good moisture-proof performance, such as silica gel and moisture-proof agents. These materials can absorb or block moisture, preventing moisture from entering the resistor, thereby protecting the resistor from damage in a humid environment. The main function of the moisture-proof layer 2 is to prevent moisture from entering the resistor through the tiny gaps of the insulating housing 1 and avoid internal components such as the resistance wire 6 and the metal end cap 4 from being affected by moisture and suffering from corrosion, short circuit and other failures. It improves the moisture-proof performance and reliability of the resistor, ensuring the stable operation of the resistor in a humid environment. By setting the moisture-proof layer 2 in the filling cavity 5, moisture can be effectively prevented from entering the resistor, improving the moisture-proof performance of the resistor. The moisture-proof layer 2 can protect the internal components of the resistor from damage in a humid environment, reducing the probability of the resistor failing and improving the reliability and stability of the resistor. By preventing the internal components from being affected by moisture, the moisture-proof layer 2 can extend the service life of the resistor and reduce the maintenance and replacement costs caused by a humid environment.

[0033] Furthermore, a flame-retardant layer 3 is provided between the moisture-proof layer 2 and the ceramic core column 7.

[0034] Specifically, as Figure 1As shown, the flame-retardant layer 3 is located between the moisture-proof layer 2 and the ceramic core column 7, directly covering the outside of the ceramic core column 7. The flame-retardant layer 3 is made of materials with flame-retardant properties. These materials can prevent the spread and expansion of flames under high-temperature or fire conditions, providing additional protection for the resistor. The main function of the flame-retardant layer 3 is to enhance the flame-retardant performance of the resistor, preventing fires or the spread of fire caused by reasons such as overheating or short-circuiting of the resistor. It can effectively prevent the flame from spreading into the resistor during a fire, protecting the internal components of the resistor from damage and reducing the impact of the fire on the surrounding environment and equipment. By setting the flame-retardant layer 3 between the moisture-proof layer 2 and the ceramic core column 7, the flame-retardant performance of the resistor is significantly enhanced, and it can effectively prevent the spread and expansion of flames under high-temperature or fire conditions, protecting the safety of the resistor and surrounding equipment. The flame-retardant layer 3 increases the safety and reliability of the resistor, reducing the accident risk caused by fire. It can quickly respond during a fire, preventing the spread of fire and buying more time for rescue and firefighting. The combination of the moisture-proof layer 2 and the flame-retardant layer 3 provides multiple protections for the resistor. The moisture-proof layer 2 prevents moisture intrusion, and the flame-retardant layer 3 prevents flame spread, jointly ensuring the stable operation and safe use of the resistor in a harsh environment.

[0035] Further, there are two resistance wires 6, and the two resistance wires 6 are wound around the ceramic core column 7 in a bidirectional anti-helical manner.

[0036] Specifically, as Figure 1 shown, the electromagnetic fields generated by the two bidirectionally anti-helically wound resistance wires 6 can cancel each other out to reduce the inductance coefficient of the resistor, improving the stability and service life of the resistor.

[0037] Further, there are protrusions 14 provided on both sides of the bottom of the insulating housing 1, and an upward groove 15 is formed between the protrusions 14.

[0038] Specifically, as Figure 1 shown, the groove 15 makes there be a certain gap between the bottom surface of the resistor and the substrate after the resistor is installed on the substrate, improving the heat dissipation effect of the resistor.

[0039] Further, the groove 15 is filled with a thermal grease layer.

[0040] Further, the depth of the groove 15 is 0.5 mm.

[0041] Specifically, as Figure 1 shown, the thermal grease layer is pre-set in the groove 15, and then the resistor is welded to the substrate and the electrical connection of the lead 11 is completed. The thermal grease layer can increase the heat dissipation effect of the resistor.

[0042] The above are only the preferred embodiments of the present utility model, and do not impose any formal restrictions on the present utility model. Based on the technical essence of the present utility model, any simple modifications, equivalent replacements, and improvements made to the above embodiments within the spirit and principles of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A wire wound resistor with adjustable welding angle, comprising a ceramic core column (7), characterized in that: The ceramic core column (7) is provided with metal end caps (4) at both ends, a resistance wire (6) is wound around the surface of the ceramic core column (7), and both ends of the resistance wire (6) are respectively welded to the metal end caps (4). The metal end caps (4), the resistance wire (6) and the ceramic core column (7) are externally enclosed by an insulating shell (1). Metal rods (9) are provided on the outer end surfaces of the two metal end caps (4). One end of the metal rod (9) away from the ceramic core column (7) passes through the insulating shell (1), and one end of the metal rod (9) located on the insulating shell (1) is connected to a lead wire (11) through a rotating part.

2. A wire wound resistor with adjustable welding angle according to claim 1, characterized in that: The rotating part comprises a rotating seat (8) and a rotating ball (10); the rotating seat (8) is connected to one end of the metal rod (9) away from the ceramic core column (7); the rotating ball (10) is movably connected to the rotating seat (8); and the rotating ball (10) is fixedly connected to one end of the lead wire (11).

3. A wire wound resistor with adjustable welding angle according to claim 2, characterized in that: A rotating cavity (12) adapted to the rotating ball (10) is provided inside the rotating seat (8), and an opening (13) connected to the rotating cavity (12) is provided on the surface of the rotating seat (8), wherein the diameter of the opening (13) is smaller than the diameter of the rotating ball (10).

4. A wire wound resistor with adjustable welding angle according to claim 3, characterized in that: A filling cavity (5) is formed between the insulating shell (1) and the ceramic core column (7), and a moisture-proof layer (2) is provided in the filling cavity (5).

5. A wire wound resistor with adjustable welding angle according to claim 4, characterized in that: A flame retardant layer (3) is provided between the moisture-proof layer (2) and the ceramic core column (7).

6. A wire wound resistor with adjustable welding angle according to claim 1, characterized in that: Two resistance wires (6) are provided, and the two resistance wires (6) are wound on the ceramic core column (7) in a bidirectional counter-helical manner.

7. A wire wound resistor with adjustable welding angle according to claim 1, characterized in that: The bottom of the insulating shell (1) is provided with protrusions (14) on both sides, and an upward groove (15) is formed between the protrusions (14).

8. The wire wound resistor with adjustable welding angle according to claim 7, characterized in that: The groove (15) is filled with a thermally conductive silicone grease layer.

9. The wire-wound resistor with adjustable welding angle according to claim 7, characterized in that: The depth of the groove (15) is 0.5 mm.

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