Closed water boiler

Abstract

The invention discloses a closed water boiler. The closed water boiler comprises a heating water tank; an electric heating pipe is mounted on a liner of the heating water tank; the liner of the heating water tank is synchronously communicated with a water inlet pipe and a water outlet pipe; a water inlet switch valve is arranged on the water inlet pipe; a water outlet switch valve is arranged on the water outlet pipe; the water inlet pipe between the water inlet switch valve and the heating water tank is communicated with an expansion water tank; the expansion water tank includes a shell, and a diaphragm for dividing an inner cavity of the shell; the inner cavity of the shell on one side of the diaphragm is a gas cavity; gas is filled in the gas cavity; the inner cavity of the shell on the other side of the diaphragm is a water cavity; and the water cavity is communicated with the water inlet pipe. Further, the water inlet pipe between the water inlet switch valve and the heating water tank is communicated with a safety valve; the safety valve includes a cylinder, a piston, a piston rod and a pressure relief pipe; and when the pressure suffered by the liner of the heating water tank exceeds a set value, the water pressure drives the piston to move to enable the pressure relief pipe to communicate with the liner of the heating water tank through the inner cavity of the cylinder and the water inlet pipe for pressure relief. The closed water boiler can heat boiled water with a temperature of higher than 100 DEG C, and is lower in manufacturing cost and better in safety.

Description

technical field [0001] The invention relates to the technical field of electric water heater manufacture, in particular to a closed water boiler. Background technique [0002] Most of the water boilers in the market are open water boilers. The heating temperature of this open water boiler will not exceed 100°C due to atmospheric pressure. Nowadays, with the improvement of living standards and higher requirements for health conditions, in some occasions it is necessary to use 105°C boiling water or to heat the water to 105°C, which requires the water boiler to use a closed heating water tank, but closed When the heated water temperature exceeds 100°C, the inner liner of the heating water tank must withstand higher pressure due to the expansion of boiling water, which requires the inner liner of the heating water tank to be made of high pressure-resistant materials, such as titanium alloy materials, so it will Greatly increase the manufacturing cost of water boiler. In addi...

AI Technical Summary

Problems solved by technology

Nowadays, with the improvement of living standards and higher requirements for health conditions, in some occasions it is necessary to use 105°C boiling water or to heat the water to 105°C, which requires the water boiler to use a closed heating water tank, but closed When the heated water temperature exceeds 100°C, the inner liner of the heating water tank must withstand higher pressure due to the expansion of boiling water, which requires the inner liner of the heating water tank to be made of high pressure-resistant materials, such as titanium alloy materials, so it will Greatly increase the manufacturing cost of the water boiler

In addition, if the thermostat of this kind of closed water boiler fails, there will be a danger of bursting or explosion due to the high pressure of the heating water tank, which has potential safety hazards.

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