Storage type water heater anticorrosion device, control method and water heater

Abstract

The invention discloses a storage type water heater anticorrosion device, a control method and a water heater. The device consists of a water tank, a battery, an electric control chip, an auxiliary electrode and a reference electrode. The auxiliary electrode and the reference electrode are welded together and disposed in the water tank, and the reference electrode is in insulation connection withthe water tank fixedly to provide a water tank potential measurement reference. The electric control chip leads out a first pin, a second pin, a third pin and a fourth pin, wherein the first pin and the second pin are connected to the positive electrode and negative electrode of the battery respectively, the third pin is electrically connected to the reference electrode, and the fourth pin is connected to the external surface of the water tank. The electric control chip receives an electric signal fed back from the reference electrode and controls the potential of the water tank within a set range based on the electric signal. The battery anode components are replaceable. When a user chooses electrical outage of the water heater or electrical outage outside the water heater, the anticorrosion device still provides continuous anticorrosion protection to the water heater water tank, achieves ceaseless anticorrosion protection, and realizes the long-term safe storage type water heater anticorrosion effect with no need for magnesium rod and no dependence on commercial power.

Description

technical field [0001] The invention belongs to the technical field of water heaters, and in particular relates to a water storage type water heater anticorrosion device, a control method and a water heater. Background technique [0002] At present, electric water heaters and heat pump water heaters usually use carbon steel water tanks as hot water storage containers. In order to improve the corrosion resistance of carbon steel water tanks, the following three methods are generally used to achieve water tank anticorrosion: "magnesium rod + enamel" sacrificial anode method , "magnesium rod + electronic anode" cathodic protection method and change the material of the water tank. Among them, changing the material of the water tank is to use corrosion-resistant materials such as plastic to make the water storage tank. Compared with metal materials, although plastic and other materials have high corrosion resistance, further practice is needed in terms of pressure-bearing capacit...

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Problems solved by technology

[0003] In the prior art, in order to improve the corrosion resistance of carbon steel water tanks, it is common practice to coat the inner surface of carbon steel water tanks with vitreous enamel to block the direct contact between carbon steel and water. The sacrifice of "magnesium rod + enamel" In the anode method, magnesium rods with higher metal activity than carbon steel are used as sacrificial anodes. The disadvantage of this scheme is that the coating of enamel inside the water tank is uneven and not dense, and it cannot completely block the direct contact between water and carbon steel. , and during the heating-cooling process of the water body, thermal expansion and contraction will occur, resulting in cracks and gradual peeling; the electrochemical reaction between the magnesium rod and water is gradually consumed, and part of the electrons released by the magnesium rod is conducted to the carbon steel water tank to inhibit the corrosion of carbon steel , but the scale components such as magnesium hydroxide and magnesium carbonate generated by the magnesium rod itself will adhere to the heating pipe, the inner wall of the water tank, etc., affecting the heating efficiency of the water heater, providing a place for bacteria and other microorganisms to breed, causing water quality problems such as discoloration and odor

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