Temperature limiting explosion-proof bolt and water storage electric water heater with bolt

Abstract

The invention discloses a temperature limiting explosion-proof bolt and a water storage electric water heater with the bolt. The explosion-proof bolt comprises a carrier, a first-stage melting bolt, asecond-stage melting bolt, a third-stage melting bolt and an insulation piece. The carrier is used for bearing the melting bolts, and meanwhile, is used for connecting with a liner of the water heater. The melting bolts are metal alloys; the melting point of the first-stage melting bolt is 135 DEG C; the melting point of the second-stage melting bolt is 145 DEG C; and the melting point of the third-stage melting bolt is 160 DEG C. The insulation piece is used for reducing the contact area of the explosion-proof bolt with water to reduce consumption of an anode protecting device by electrochemical corrosion. The explosion-proof bolt is mounted above a heating device of the water heater; when the heating device heats the water stored in the liner, due to the convection effect, the explosion-proof bolt can effectively sense the highest water temperature in the liner; and meanwhile, the explosion-proof bolt is mounted at the upper part of the water heater for effectively eliminating the incrustation stripping disturbance of the heating device. The explosion-proof bolt can prevent the explosion, can effectively prompt users to prevent scalding of the users when failures occur, and reduces possible water leaching loss to the greatest extent under the precondition of safety.

Description

technical field [0001] The invention belongs to the field of household electrical appliances, and in particular relates to a temperature-limiting explosion-proof plug and a storage-type electric water heater equipped with the plug. Background technique [0002] The existing water storage type electric water heater has a temperature limiting device and a pressure unloading device, but the explosion of the water storage type electric water heater occurs from time to time, which brings huge losses to the user's health and property. The reason for the explosion of the storage type electric water heater is that the heating control fails, the mechanical pressure relief device fails, the water heater continues to heat, and the temperature of the hot water in the tank continues to rise. With the rise of the water temperature in the water heater tank, the saturated steam pressure of the hot water rises rapidly. The pressure in the gallbladder gradually increases. Due to the physical...

AI Technical Summary

Problems solved by technology

The electric water heater itself has a temperature limiting device and a pressure relief device. When the temperature limiting device and the pressure relief device work normally, they can effectively prevent the water heater from exploding. However, when the temperature limiting device and the pressure relief device fail, an explosion will occur with a certain probability.

The temperature limiting device and the pressure relief device used on the water heater are both mechanical structures. The failure causes of the temperature limiting device are mainly divided into two cases: the mechanical structure itself is damaged and the inner tank cannot be tightly fitted. Failure due to scale accumulation or damage to its own mechanical structure

From the perspective of safety assurance, the defects of these two protection devices mainly include: 1. They are highly dependent on the effectiveness of the installation, and the degree of fit between the temperature limiter and the inner tank has a great influence on the action of the temperature limiter, and even 2. The installation position and working principle of the pressure relief valve are easily disturbed by scale, and after the electric water heater has been working for a period of time, a large amount of scale will be generated in the tank due to repeated heating of hot water; 3. The temperature limiter and the vent The action of the pressure valve depends on the mechanical structure, and the mechanical structure has a certain probability of failure risk

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