a water heater

Abstract

The present invention provides a water heater, including a loop current detection device, the loop current detection device includes a loop self-test unit connected with the loop to detect whether the loop is reversely connected, so as to avoid the problem of reversed connection of the detection device. Specifically, the loop is mainly composed of a first input terminal, a second input terminal and the sampling resistor, and the voltage stabilization providing unit is connected to the loop self-checking unit to provide the loop self-checking unit to detect whether the loop is connected or not. inverse reference voltage. In addition, when the first input end is externally connected to the water heater shell, and the second input end is externally connected to the magnesium rod of the water heater, the loop self-checking unit can detect whether the magnesium rod is consumed by judging whether the input voltage is greater than the preset alarm threshold. do.

Description

【Technical field】 [0001] The invention relates to household appliances, in particular to a water heater including a loop current detection device. 【Background technique】 [0002] Generally, in order to prevent water alkali and scale from adhering to the inner tank of water storage type electric water heaters, household water storage electric water heaters generally adopt the method of sacrificing magnesium rods, and use magnesium rods to release magnesium ions to relieve water alkali and scale damage to the interior. gallbladder corrosion. Once the magnesium rod is consumed, if it is not replaced in time, it will easily cause corrosion of the inner tank or corrosion and perforation of the heating pipe. On the one hand, it will shorten the life of the machine, on the other hand, it will also cause the danger of electric leakage, resulting in personal injury accidents. [0003] The current way to detect the consumption of magnesium rods in electric water heaters is mainly tha...

AI Technical Summary

Problems solved by technology

Once the magnesium rod is consumed, if it is not replaced in time, it will easily cause corrosion of the inner tank or corrosion and perforation of the heating pipe. On the one hand, it will shorten the life of the machine, on the other hand, it will also cause the danger of electric leakage, resulting in personal injury accidents

[0003] The current way to detect the consumption of magnesium rods in electric water heaters is mainly that the manufacturer provides after-sales service, regularly visits to detect the consumption of magnesium rods and replace the magnesium rods to eliminate hidden dangers, but because different users use different frequencies of electric water heaters, magnesium rods The consumption rate is also different, so the method of regular inspection may not be able to detect that the magnesium rod is exhausted, and it is necessary to send personnel to conduct inspections many times, and the labor cost is high.

[0004] Although there are some devices in the prior art that can automatically detect the consumption of magnesium rods in water heaters, these devices usually detect the loop current. During the detection, it is easy to cause the two input terminals of the detection device to be reversed, so that the magnesium of the water heater cannot be detected. stick consumption

The same situation similar to the reverse connection may also occur on other types of detection devices in the water heater

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