A high strength ceramic wire wound resistor

Abstract

A high-strength ceramic wire-wound resistor of the present invention comprises a ceramic base tube, a resistance wire and two sets of bracket assemblies. The ceramic base tube comprises a tube body with an elliptical longitudinal section and two connecting parts at the two ends of the tube body. The tube body and the connecting part are both solid, and the longitudinal section of the connecting part is rectangular. The tube body and the connecting part are an integrally formed structure. The resistance wire is spirally wound on the surface of the tube body. The two sets of bracket assemblies are respectively fixed to the two connecting parts. Each set of bracket assemblies comprises a stud, a nut and a bracket. The bracket is buckled at the end of the connecting part. The connecting part and the bracket are fixed to each other by the stud and the nut. The two ends of the resistance wire are fixed to the studs at the corresponding ends of the ceramic base tube so that the studs also serve as wiring terminals. The ceramic base tube has high strength and stability, is not easy to break in transportation collision, and is not easy to crack due to equipment vibration during use.

Description

Technical Field

[0001] The invention relates to the technical field of resistors, in particular to a simulated load experiment of an energy consumption braking circuit suitable for large current braking equipment, test equipment, lifting and other frequency converters, and in particular to a high-strength ceramic winding resistor. Background Art

[0002] Wirewound resistors are mainly used to play the role of voltage reduction, current shunting, load, feedback, energy conversion, matching, etc. in low-frequency AC circuits, or as absorbers and voltage dividers in power circuits. They can also be used as shunts in oscillation circuits and transformer attenuation adjustment and pulse forming circuits. In addition, they can also be used for the discharge and spark elimination of filter-level capacitors in rectifiers. At the same time, they can be widely used in home appliances, medical equipment, automotive industry, railways, aviation, military equipment and instruments and other fields.

[0003] Existing wire-wound resistors generally include a hollow circular base tube, brackets fixed at both ends of the base tube, and a resistance wire spirally wound outside the base tube. The base tube is generally a porcelain tube, and a screw is inserted inside the porcelain tube to fix the bracket. However, there are many specifications of wire-wound resistors. In actual production, it is necessary to customize screws of corresponding specifications according to the diameter and length of the porcelain tube, which increases production costs and is inconvenient to assemble. Moreover, there are many types of screws and they are difficult to manage. In existing wire-wound resistors, due to the presence of the screw, the base tube must be hollow so that the screw can pass through the base tube. The circular hollow base tube has the following problems: in terms of stability, it is easy to break during transportation collision, and it is easy to crack due to equipment vibration during use; in terms of heat dissipation, most of the heat of the resistance wire is transferred to the base tube, and because the base tube is hollow, the physical volume of the base tube is small, the heat that can be absorbed is limited, and the heat dissipation performance is poor. Summary of the invention

[0004] In view of the above technical problems in the prior art, the present invention provides a high-strength ceramic wirewound resistor, which can improve the strength and stability of the base tube and can improve the heat absorption performance.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] Provided is a high-strength ceramic wirewound resistor, comprising a ceramic base tube, a resistance wire and two groups of bracket assemblies, wherein the ceramic base tube comprises a tube body with an elliptical longitudinal section and two connecting parts located at two ends of the tube body, the tube body and the connecting parts are both solid, the longitudinal section of the connecting part is rectangular, the tube body and the connecting part are an integrally formed structure, the resistance wire is spirally wound on the surface of the tube body, and two groups of bracket assemblies are respectively fixed to the two connecting parts; each group of the bracket assemblies comprises a stud, a nut and a bracket, the bracket is buckled on the end of the connecting part, the connecting part and the bracket are fixed to each other through the stud combined with the nut, the stud is arranged perpendicular to the length direction of the ceramic base tube, and the two ends of the resistance wire are fixed to the studs at the corresponding ends of the ceramic base tube, so that the studs also serve as wiring terminals.

[0007] Specifically, each of the connecting parts is provided with two transition holes perpendicular to the length direction of the ceramic substrate tube, and the stud passes through the bracket and the transition holes and then is covered with the nut, so that the connecting part and the bracket are fixed to each other.

[0008] Specifically, a gasket is provided between the nut and the bracket.

[0009] Specifically, the bracket includes a U-shaped upper bracket and a lower bracket which are both integrally stamped and formed, and the upper bracket and the lower bracket are buckled at the upper end and the lower end of the connecting part respectively.

[0010] Specifically, the lower bracket has a support plate extending transversely.

[0011] Specifically, the support plate is provided with a mounting hole.

[0012] Specifically, the outer side of the tube body is provided with spirally arranged grooves, and the resistance wire is embedded in the grooves.

[0013] Specifically, the resistance wire and the slot are interference fit.

[0014] Beneficial effects of the present invention:

[0015] Compared with the prior art, the high-strength ceramic wirewound resistor of the present invention has the following advantages:

[0016] 1. The brackets at both ends of the ceramic base tube are fixed to each other by independent stud nuts. There is no need for the traditional screw that passes through the base tube. There is no need to set screws of corresponding lengths for base tubes of different specifications. They can be fixed with stud nuts of the same specifications, which is easy to manage.

[0017] 2. The tube body and the connection part are solid. The tube body is elliptical in longitudinal section, with high strength and stability. It is not easy to break during transportation collision. The ceramic base tube is not easy to crack due to equipment vibration during use. The ceramic base tube has a large physical volume and can absorb more heat, which has a better heat dissipation effect on the resistance wire.

[0018] 3. The two ends of the resistance wire are fixed to the studs at the corresponding ends of the ceramic base tube, so that the studs also serve as wiring terminals. The studs, which originally serve as fixed properties, have also been combined with wiring terminals, and there is no need to set up additional wiring terminals. The structure is more compact and the manufacturing cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the high-strength ceramic wirewound resistor in the embodiment.

[0020] Figure 2 for Figure 1 Magnified view at A in the middle.

[0021] Reference numerals:

[0022] Ceramic base tube 1, tube body 11, connecting part 12;

[0023] Resistance wire 2;

[0024] Bracket assembly 3, stud 31, nut 32, bracket 33, upper bracket 331, lower bracket 332, support plate 333, mounting hole 3331. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0026] The high strength ceramic wire wound resistor of this embodiment, such as Figure 1 and Figure 2 As shown, the ceramic substrate tube 1, the resistance wire 2 and two groups of bracket 33 components 3 are included. The ceramic substrate tube 1 includes a tube body 11 with an elliptical longitudinal section and two connecting parts 12 located at the two ends of the tube body 11. The tube body 11 and the connecting part 12 are both solid, and the longitudinal section of the connecting part 12 is rectangular. The tube body 11 and the connecting part 12 are an integrally formed structure. During processing, a square ceramic is polished into an elliptical shape to form the ceramic substrate tube 1 of this embodiment. The resistance wire 2 is spirally wound on the surface of the tube body 11, and the two groups of bracket 33 components 3 are respectively fixed to the two connecting parts 12. Each group of bracket 33 components 3 includes a stud 31, a nut 32 and a bracket 33. The bracket 33 is buckled at the end of the connecting part 12. The connecting part 12 and the bracket 33 are fixed to each other through the stud 31 combined with the nut 32. The two ends of the resistance wire 2 are fixed to the stud 31 at the corresponding end of the ceramic substrate tube 1, so that the stud 31 also serves as a terminal.

[0027] Compared with the prior art, the high-strength ceramic wirewound resistor of this embodiment has the following advantages:

[0028] 1. The brackets 33 at both ends of the ceramic substrate tube 1 are fixed to each other by independent studs 31 and nuts 32, without the need for a conventional screw that passes through the substrate tube. There is no need to set screws of corresponding lengths for substrate tubes of different specifications. All of them can be fixed with studs 31 and nuts 32 of the same specifications, which is easy to manage;

[0029] 2. The tube body 11 and the connecting part 12 are both solid. The tube body 11 is elliptical in longitudinal section, has high strength and stability, is not easy to break during transportation collision, and is not easy to crack the ceramic base tube 1 due to equipment vibration during use; the ceramic base tube 1 has a large physical volume and can absorb more heat, which has a better heat dissipation effect on the resistance wire 2;

[0030] 3. The two ends of the resistance wire 2 are fixed to the studs 31 at the corresponding ends of the ceramic base tube 1, so that the studs 31 also serve as wiring terminals. The studs 31, which originally serve as fixing properties, have also been combined with wiring terminals, and there is no need to set up additional wiring terminals, making the structure more compact and reducing manufacturing costs.

[0031] In this embodiment, each connection part 12 is provided with two transition holes perpendicular to the length direction of the ceramic substrate tube 1, and the bracket 33 includes an upper bracket 331 and a lower bracket 332 which are both integrally stamped and formed in a U shape, and the upper bracket 331 and the lower bracket 332 are buckled on the upper end and the lower end of the connection part 12 respectively, and the upper bracket 331 and the lower bracket 332 are respectively provided with holes aligned with the transition holes at corresponding positions. The stud 31 passes through the hole and the transition hole of the bracket 33 and then is covered with the nut 32, so that the connection part 12 and the bracket 33 are fixed to each other, and a gasket is provided between the nut 32 and the bracket 33. Of course, in practice, if the connection part 12 does not have a transition hole, the screw passes through the U-shaped bracket 33, and the bracket 33 is only pressed by the nut 32, so that the opening of the bracket 33 is reduced and clamped, but the stability performance is not as good as that of this embodiment, so it is not a preferred solution.

[0032] In this embodiment, a support plate 333 is extended laterally from the lower bracket 332 , and the support plate 333 is provided with a mounting hole 3331 for connecting the entire resistor to a peripheral device.

[0033] In this embodiment, a spirally arranged groove is provided on the outer side of the tube body 11, and the resistance wire 2 is embedded in the groove. The resistance wire 2 and the groove have an interference fit, which can prevent different segments of the resistance wire 2 from being attracted under the action of large current, thereby improving the stability of the resistance wire 2 during use, and increasing the contact area between the resistance wire 2 and the ceramic base tube 1, further improving the thermal conductivity and heat dissipation effect of the resistance wire 2.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A high strength ceramic wire wound resistor, characterized by: It includes a ceramic base tube, a resistance wire and two groups of bracket assemblies, the ceramic base tube includes a tube body with an elliptical longitudinal section and two connecting parts located at the two ends of the tube body, the tube body and the connecting parts are both solid, the longitudinal section of the connecting part is rectangular, the tube body and the connecting part are an integrally formed structure, the resistance wire is spirally wound on the surface of the tube body, and the two groups of bracket assemblies are respectively fixed to the two connecting parts; each group of the bracket assemblies includes a stud, a nut and a bracket, the bracket is buckled on the end of the connecting part, the connecting part and the bracket are fixed to each other through the stud combined with the nut, the stud is arranged perpendicular to the length direction of the ceramic base tube, and the two ends of the resistance wire are fixed to the studs at the corresponding ends of the ceramic base tube, so that the studs also serve as wiring terminals.

2. A high strength ceramic wire wound resistor according to claim 1, characterized in that: Each of the connecting parts is provided with two transition holes perpendicular to the length direction of the ceramic substrate tube. The stud passes through the bracket and the transition holes and then is covered with the nut, so that the connecting part and the bracket are fixed to each other.

3. A high strength ceramic wire wound resistor according to claim 2, characterized in that: A gasket is arranged between the nut and the bracket.

4. A high strength ceramic wire wound resistor according to claim 1, 2 or 3, characterized in that: The bracket comprises an upper bracket and a lower bracket which are both integrally stamped and formed in a U shape, and the upper bracket and the lower bracket are buckled at the upper end and the lower end of the connecting part respectively.

5. A high strength ceramic wire wound resistor according to claim 4, characterized in that: The lower bracket is laterally extended with a support plate.

6. A high strength ceramic wire wound resistor according to claim 5, characterized in that: The support plate is provided with a mounting hole.

7. The high strength ceramic wire wound resistor according to claim 1, characterized in that: The outer side of the tube body is provided with spirally arranged grooves, and the resistance wire is embedded in the grooves.

8. A high strength ceramic wire wound resistor according to claim 7, characterized in that: The resistance wire is interference fit with the slot.

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