Water supply device and descaling method for same

Abstract

The invention provides a water supply device and a descaling method for the same. The water supply device comprises an inner container and a descaling unit. The descaling unit comprises: at least three electrodes; a DC source, which has a positive electrode and a negative electrode; and a controller, which is configured to allow the descaling unit to have a plurality of descaling procedures. In each descaling procedure, two electrodes are selected from the at least three electrodes and respectively connected with the positive electrode and the negative electrode of the DC source in an electrical way so as to respectively function as an anode and a cathode; and in a subsequent descaling procedure, the electrode used as the cathode in the previous descaling procedure is electrically connected with the positive electrode of the DC source and used as the anode in the current descaling procedure, and another electrode selected from electrodes which are not electrically connected with the DC source in the previous descaling procedure is electrically connected with the negative electrode of the DC source and used as the cathode in the current descaling procedure. According to the invention, a plurality of electrodes work alternately, the cathode is converted into the anode, so descaling of the electrodes is automatically realized; and the advantage of long service life of the electrodes is obtained.

Description

technical field [0001] The invention relates to the technical field of descaling, in particular to a water supply device with a descaling function and a method for descaling the water supply device. Background technique [0002] In the existing water storage type electric water heater, the metal tubular heating tube is placed in the inner tank to directly heat the water. Usually tap water contains a certain concentration of calcium and magnesium ions. When the water is heated or evaporates, calcium and magnesium compounds will precipitate and precipitate, which will deposit on the surface of the heating tube and the inner wall of the inner tank to form scale. The thermal conductivity of the scale is low, and when the scale deposited on the surface of the heating tube reaches a certain thickness, the heat exchange efficiency between the heating tube and the water will be reduced, and the power consumption will be increased. In addition, when the scale is too thick, the heati...

AI Technical Summary

Problems solved by technology

However, coating the surface of the heating tube with a hydrophobic material can only reduce the scaling of the heating tube, but cannot reduce the formation of scale in the inner tank of the electric water heater; the silicon-phosphorus crystal method is a chemical method, and additional chemical substances are added to the water, which affects the health of the user. It is difficult to integrate the silicon-phosphorus crystal drug tank or filter element with the electric water heater, and additional installation is required, which takes up space and is not beautiful

Images