The steam turbine bolt electric heater ZJ-22-7(R) is a high-efficiency electric heating device specially used for heating steam turbine bolts. It is mainly used in the installation and maintenance of steam turbines. By heating the bolts, the bolts are elongated by the principle of thermal expansion, thereby reducing the torque required for tightening or removing the nuts. This heater is widely used in places such as thermal power plants and is of great significance for the rapid disassembly and assembly of large bolts.

Working principle

Steam turbine bolt electric heater ZJ-22-7(R) uses electric heating elements to generate heat to expand the bolts due to heat. Its heating elements are usually made of nickel-chromium alloy wire, which has high resistivity and good heat resistance. The heating element is encapsulated in a heat-resistant stainless steel tube, which generates heat through electric current heating, and the heat is transferred to the bolts through heat conduction. When the temperature of the bolt rises, its length will increase due to thermal expansion, thereby reducing the torque required when removing or installing the nut.

Structural features

The structural design of this heater is compact and easy to install and use. The length and diameter of the heating rod can be customized according to the specific size of the bolt. The high insulation resistance of the heater ensures safe operation under high voltage. In addition, the heater has a long service life of more than 5,000 hours.

Technical parameters

• Rated voltage: 380V

• Rated power: 1kW~7kW

• Heating temperature range: room temperature to 400℃

• Heating time: a few minutes

• Insulation resistance: ≥50MΩ

• Protective cover material: heat-resistant stainless steel pipe

Application scenarios

During the maintenance and overhaul of steam turbines, the removal and installation of bolts is an important and tedious task. Traditional hand tools are often inefficient when handling large bolts and are prone to damage to the bolts. Steam turbine bolt electric heater ZJ-22-7(R) can quickly and evenly heat the bolts through electric heating, so that the bolts reach the required temperature in a short time, thereby achieving rapid removal and installation. This not only improves work efficiency, but also reduces the maintenance costs caused by bolt damage.

In conclusion, the steam turbine bolt electric heater ZJ-22-7(R) is an efficient and reliable bolt heating equipment, which plays an important role in the installation and maintenance of steam turbines. With the continuous improvement of technology and the increase of market demand, this equipment will have broad development prospects in the future.

By the way, we have been supplying spare parts for power plants around the world for 20 years, and we have rich experience and hope to be of service to you. Looking forward to hearing from you. My contact information is as follows:

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