CN2187227Y

CN2187227Y - Bolt electric heater for repairing steam turbine

Info

Publication number: CN2187227Y
Application number: CN 93246458
Authority: CN
Inventors: 裴义兴
Original assignee: Zhenjiang Nanfang Electric Welding Equipment Factory
Current assignee: Zhenjiang Nanfang Electric Welding Equipment Factory
Priority date: 1993-12-23
Filing date: 1993-12-23
Publication date: 1995-01-11
Anticipated expiration: 2003-12-23

Abstract

The utility model relates to a bolt electric heater for repairing steam turbines, which is formed by the connection of a regulated power supply and a resistance-type heating rod, wherein, the regulated power supply is 50 cycles in frequency, 30 kilovolt-amperes in power and 50 volts in output terminal voltage of current supply. One end of a resistance wire in a heating wedge is electrically contacted with one pole of the power supply directly through a wire connection joint, while the other end is at first electrically contacted with a metal case of the heating rod directly, and then the metal case is electrically contacted with the other pole of the power supply. The utility model has the advantages that the electric breakdown phenomenon can be eliminated with low voltage and few insulative materials, the serving life of the utility model can be prolonged, the heat-transfer efficiency can be enhanced and the electric shock danger can be avoided.

Description

Bolt electric heater for repairing steam turbine

The utility model belongs to a kind of resistance-type heater that the dismounting turbine bolt is used of doing.

Overhaul in the process at steam turbine, dismounting to bolt is required great effort very much, needing in advance it to be added thermal expansion can finish smoothly, yet the heating equipment that generally adopts now, be directly to switch on 220 volts of ac power supplys to giving heating stick, resistance wire in the heating stick housing in the middle of the insulating material, two wiring terminals of its two ends through drawing side by side, direct and power supply two output polars are realized electrically contacting.The shortcoming of this kind structural type is: because of voltage height, big easily generation of electric current puncture, influence working life; For improving electrical insulation, need expend more high-temperature insulation material, to sacrifice heat transfer efficiency simultaneously; Heating stick operates in 220 volts of dangerous voltage status, exists the hidden danger of electric shock accidents.

The purpose of this utility model is to improve the structure of existing bolt Electric heating appliance, thereby saves electrically insulating material, the electric shock accidents in improving rate of heating and avoiding operating.

Content of the present utility model relates to and a kind ofly connects the resistor-type heating stick and the improved technological scheme of turbine bolt electric heater that constitutes by ac power supply apparatus, it is characterized in that: described ac power supply apparatus is that a frequency is that 50 weeks, power are that 30 kilovolt-amperes, power supply output end voltage are 50 volts stabilized power supply; Resistance wire in described resistor-type heating stick in the insulating material, the one end is realized electrically contacting through output electrode of a wiring joint and described power supply output terminal, and the other end of described resistance wire with add excellent metal shell and directly electrically contact; Described heating stick metal shell directly electrically contacts with another output electrode that described power supply is exported again.

Advantage of the present utility model is its lower power supply voltage of heating stick, less insulating material, just can eliminate electric breakdown phenomena, thereby increases the service life, improves heat transfer efficiency and avoid the harm of getting an electric shock.

The concrete enforcement of the utility model technique scheme, as shown in drawings:

Fig. 1 is the utility model general structure and connection diagram;

Fig. 2 is that heating stick structure of the present utility model is formed schematic representation.

In this embodiment, ac power supply apparatus is a power controling box 1,50 volts of voltages, 30 kilovolt-amperes of power, the Ac in 50 weeks of frequency are drawn by the output terminal of this case 1, guide heating stick into through power line 2, in the power line 2 one through the rapid pipe joint interface 3 on heating stick insulated handle 4 tops directly with heating stick metal shell 7 interior insulating material 9 in resistance wire 8 electrically contact, another strand then guided the contact stud 6 on the heating stick metal shell 7 in the power line 2.Power line 2 also can adopt a concentric cable to replace twinax cable.

Claims

A kind of turbine bolt electric heater, connect the resistor-type heating stick and constitute by ac power supply apparatus, it is characterized in that: described ac power supply apparatus is that a frequency was 50 weeks, power is 30 kilovolt-amperes, the power supply output end voltage is 50 volts a stabilized power supply, be arranged in the resistance wire of described resistor-type heating stick insulating material, the one end is realized electrically contacting through an output electrode of a wiring joint and described power supply output terminal, the other end of described resistance wire at first directly electrically contacts with the heating stick metal shell, and then this heating stick metal shell directly electrically contacts with another output electrode of described power supply output terminal again.