Electric water heater having instant water heating and water storage function

Abstract

An electric water heater with instant water heating and water storage functions is composed of an electric heater, a water cavity, and a water inlet cavity under said water cavity. Said water inlet cavity has a floating drum in it. Said electric heater is fixed in the water cavity above the floating drum. A cover of floating drum is fixed above the electric heater. It features that the volume of heated cavity is variable.

Description

technical field [0001] The invention belongs to an electric heating device, in particular to an electric water heater. Background technique [0002] There are two types of existing electric water heaters: water storage type and instant heating type. The instant electric water heater heats the flowing cold water immediately and discharges it immediately. It requires a large power and is not suitable for home use. The water storage type is mostly used, but the water storage type electric water heater has the disadvantages of long warm-up time and large heat loss, and once the hot water in the water storage tank is used up, it cannot quickly meet the needs of people to continue to use hot water; 981249620 patent The application discloses an electric water heater. Two sets of electric heating devices are installed in one electric water heater. One group is a water storage heating device for heating water in a large container, and the other group is for heating water in a small c...

AI Technical Summary

Problems solved by technology

[0002] There are two types of existing electric water heaters: water storage type and instant heating type. The instant electric water heater heats the flowing cold water immediately and discharges it immediately. It requires a large power and is not suitable for home use. The water storage type is mostly used, but the water storage type electric water heater has the disadvantages of long warm-up time and large heat loss, and once the hot water in the water storage tank is used up, it cannot quickly meet the needs of people to continue to use hot water; 981249620 patent The application discloses an electric water heater. Two sets of electric heating devices are installed in one electric water heater. One group is a water storage heating device for heating water in a large container, and the other group is for heating water in a small container. The thermal heating device uses the hydroelectric valve to switch the two sets of heating devices to work alternately, so the power of the water heater at each moment is only the power of one group of heating devices. In this patent application, the water storage type electric heating device can be used as conventional Low power, and the water in the small container heated by the instant heating device has been preheated in the large container, so lower power can also be used, so this patent application can be used before using lower power Under the problem, it has two functions of storage water heating and instantaneous heating, that is, it can obtain instant heating water with relatively low power

Its disadvantages are: 1. It has one more heating device and water and electricity switching system than the general water storage electric water heater, and the cost is higher; 2. The safety of the device is relatively reduced: because adding a group of electric heating tubes, it is bound to increase. The possibility of leakage is eliminated, and the setting of the hydroelectric switching valve also increases the possibility of failure: for example, the micro switch in the hydroelectric valve sometimes burns out due to excessive current or long working time, and the hydroelectric valve itself will be damaged due to aging. Deformation and unable to withstand the working pressure, resulting in water leakage or dry heating of the instant heating device and other failures; another example is that the heating container of the instant heating device is too small, which is easy to cause dry burning due to various reasons; 3. Strong directionality, even if the electric water heater It has been filled with water, and the water inlet pipe must also face downward, otherwise, if the hot water is turned on and used, the uniqueness of the direction cannot be satisfied, and the instant heating device will dry; 4. The power of the electric water heater generally does not exceed 3KW, because the general The micro-contact switch cannot withstand a power of more than 3KW. If the power increases, the number of micro-switches or the hardware of the control system must be increased, which will inevitably lead to a decrease in safety performance; 5. Like all instant electric water heaters, There is the disadvantage that the water inlet hole of the hydroelectric valve is easily blocked; 6. It takes a part of the water pressure to start the hydroelectric valve, and it is impossible to do the real zero-water pressure start-up work like the storage type electric water heater

Images