The utility model discloses a high-
voltage explosion-proof electric heater which comprises an explosion-proof
junction box, a heater cylinder and a heating
pipe, the lower end of the explosion-proof
junction box is provided with a lower explosion-proof
flange, the top surface of the lower explosion-proof
flange is provided with a spring groove, the spring groove is internally provided with an anti-loose spring, the upper end of the anti-loose spring is provided with a pressing plate, and the upper end of the anti-loose spring is provided with a pressing plate. The lower end of the anti-loose spring is fixed in the spring groove, and a lower fixing hole penetrating through the lower anti-explosion
flange is formed in the bottom face of the spring groove. The anti-loose spring and the pressing plate are arranged above the lower fixing hole in the lower anti-explosion flange, when
bolt connection is carried out, the bolt can press the pressing plate downwards and compress the anti-loose spring in the inserting process, on one hand, the anti-loose spring can absorb vibration, on the other hand, the anti-loose spring stores elastic force to apply upward counter-acting force to the bolt, and therefore the anti-explosion effect is achieved. Connection looseness caused by bolt rotation due to external
impact is effectively prevented, and stable and reliable connection is ensured, so that the sealing performance is ensured, the anti-explosion heater is more suitable for a high-temperature and high-pressure
working environment, and the explosion risk is reduced.