CN2437020Y

CN2437020Y - Wirewound resistance

Info

Publication number: CN2437020Y
Application number: CN 00215695
Authority: CN
Inventors: 姚文昌
Original assignee: BENGBU ELECTRIC RESISTANCE FACTORY
Current assignee: BENGBU ELECTRIC RESISTANCE FACTORY
Priority date: 2000-07-28
Filing date: 2000-07-28
Publication date: 2001-06-27
Anticipated expiration: 2010-07-28

Abstract

The utility model discloses a wire-wound resistor with high power. The utility model is mainly composed of a core tube, resistance wires and end caps, wherein, the resistance wires are wound on the core tube; both ends of the core tube are provided with the end caps; the center of each end cap is provided with a screw bolt which is connected with an electrode. The exterior of the core tube is sheathed with a ceramic housing, filling material is arranged between the core tube and the ceramic housing, and both ends of the ceramic housing are provided with ceramic end covers of which the inner walls are provided with spacing steps. The utility model which withstands high voltage reaching above 8000 volts has the advantages of safe and reliable use; because the housing and the end covers adopt ceramic material, phenomena of breakdown, arc-over and flashover easily generated by the resistor because of overvoltage are efficiently stopped.

Description

Wirewound resistor

The utility model relates to fixed resister device field in the essential electronic element, exactly is a kind of high-power wire-wound resistor.

The high-power wire-wound resistor that electric locomotive control system generally uses, be to be wound with the enamelled resistor that blackening enamel frit formation people are commonly called as on the core body of resistive conductor, this resistor volume is big, mechanical strength is low, and the high temperature high voltage resistant poor-performing, uses dangerous; In order to solve the drawback that enamelled resistor exists, in recent years, someone proposes to improve at core body outer cover one metal shell that is wound with resistive conductor its mechanical strength and high temperature high voltage resistant performance, the mechanical strength of this resistor has obtained significantly improving, high temperature resistantly reach 350-400 ℃, the high pressure resistant 4000-5000 volt that reaches, but it has brought new problem again simultaneously, owing to adopt metal shell, when voltage is higher, in case puncturing shell two ends air layer punctures easily, arcing and flashover phenomenon are brought unsafe factor to locomotive, influence the useful life of resistor simultaneously.

It is a kind of high pressure resistant more than 8000 volts that the purpose of this utility model provides, and stops to climb the high-power wire-wound resistor that resistance value descends, the outer electrification phenomenon of resistive element takes place that arc causes again.

For achieving the above object, the utility model is taked following technical scheme: this wirewound resistor mainly is made of core pipe, resistive conductor and end cap, be wound with resistive conductor on the core pipe, core pipe two ends are with end cap, the end cap center is provided with the bolt that connects resistive conductor, and core pipe outside is with ceramic package, is provided with inserts between core pipe and the ceramic package, the ceramic package two ends are provided with ceramic end cap, and ceramic end cap inwall is furnished with limited step.

The utility model compared with prior art, have high temperature resistant more than 400 ℃, high pressure resistant 8000 volts with first-class advantage, safe and reliable; Because shell and end cap adopt ceramic material, improved the insulation effect between product component greatly, the result who tests under 8000 volts of high pressure, 1min. leakage current 1mA condition to 25 resistors in Ministry of Information Industry connector relay quality supervision and inspection center shows, has stopped the puncture, arcing and the flashover phenomenon that take place because of the overtension resistor.

Description of drawings:

Fig. 1 is the utility model structural representation.

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1, this wirewound resistor mainly is made of core pipe 1, resistive conductor 2 and end cap 3, core pipe 1 selects for use pottery or composite material to make, be wound with resistive conductor 2 on the core pipe 1, core pipe 1 two ends are with end cap 3, core pipe 1 outside is with ceramic package 5, shell 5 is provided with radiating groove 9, be provided with inserts 7 such as silicon dioxide between core pipe 1 and the ceramic package 5, ceramic package 5 two ends are provided with ceramic end cap 6, pottery end cap 6 inwalls are furnished with limited step 8, and end cap 3 centers are provided with the bolt 4 that connects resistive conductor, and bolt 4 stretches out ceramic end cap 6.

Claims

1, wirewound resistor, be wound with resistive conductor on the core pipe, core pipe two ends are with end cap, the end cap center is provided with the bolt that connects resistive conductor, it is characterized in that: core pipe outside is with ceramic package, be provided with inserts between core pipe and the ceramic package, the ceramic package two ends are provided with ceramic end cap, and ceramic end cap inwall is furnished with limited step.