Heating device for liquid heating

Abstract

The invention relates to a heating device for liquid heating. The heating device comprises a sealing support, a heating body, a water inlet and a water outlet. The sealing support and the heating body are in sealed connection. A cavity is defined by the sealing support and the heating body. A sealing body is arranged inside the cavity. A sealing water channel with the certain capacity is defined by the sealing body and the heating body. The sealing water channel is communicated with the external world through the water inlet and the water outlet. Liquid entering the water inlet is sealed and limited inside the sealing water channel and flows out of the water outlet along the sealing water channel. According to the heating device, the starting-up preheating waiting time can be shortened, the continuous water outlet temperature is stable, and the temperature of cast aluminum does not need to be maintained by means of heating during standby; meanwhile, the problems that water outlet steam and non-continuous water outlet are caused by gasification due to the water circulating problem caused by a gap between a liquid flow pass and a stainless steel thick film heater can be avoided.

Description

technical field [0001] The invention relates to a heating device, in particular to a heating device for liquid heating. Background technique [0002] Generally, in heating appliances that require continuous hot water, the heating resistance wire is wrapped or filled with an insulating layer and embedded in cast aluminum with good thermal conductivity. At the same time, the stainless steel tube is bent to form a continuous liquid flow channel. in cast aluminum. [0003] Because the heat generated by the heating resistor cannot directly exchange heat with water, the cast aluminum needs to be heated to a certain temperature first, and the heat on the cast aluminum passes through the stainless steel tube liquid channel to generate heat exchange with water. Due to the large thermal inertia of aluminum, there will be the following problems: 1. When starting up, it takes a long time for 15 to 30 seconds (seconds) to warm up before the cast aluminum can be heated to the required te...

AI Technical Summary

Problems solved by technology

Due to the large thermal inertia of aluminum, there will be the following problems: 1. When starting up, it takes a long time for 15 to 30 seconds (seconds) to warm up before the cast aluminum can be heated to the required temperature; In the case of water, the heat generated by the heating resistance wire cannot keep up with the heat absorbed by the liquid in time, which will cause the temperature of the cast aluminum to drop. If the required water temperature cannot drop, you need to continue to wait for heating; 3. If the heater is in standby, you need to Use the control to keep the temperature of the cast aluminum constant, resulting in a waste of energy; 4. The cast aluminum heater with such a high thermal inertia must be preheated to obtain water at a constant temperature. When the water is continuously discharged, the water temperature cannot be kept constant.

There is no problem with the installation, but it will cause sealing problems, so that the water cannot flow completely in accordance with the flow direction of the liquid channel. There will always be a part of the water that will take a shortcut from the gap that is not tightly sealed. The water flow channel is certain, which will inevitably lead to part of the water not flowing , become stagnant water, and continue to heat there, eventually leading to gasification, resulting in steam ejection, and intermittent water discharge. At the same time, because the seal between the plastic box and the metal can only be sealed by the sealing ring, it cannot meet the requirement of a storage pressure of 8 to 10 bar. In the middle of the pressure, it may also be aging due to the speed or the sealing ring being used in a high temperature environment for a long time, and there is a risk of leakage

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