Noise-type electric shock preventing and dry burning protecting device of electric water heater

Abstract

The invention relates to a noise-type electric shock preventing and dry burning protecting device of an electric water heater, comprises a container for containing water to be heated, an electric heater used for heating the water and a control system, wherein the control system comprises a direct current power supply, an amplifier, a detector, a comparator, an actuator, a sensing electrode, a container ground wire, a circuit ground wire and a protecting ground wire. The positive end of direct current voltage UC output by the direct current power supply is respectively connected with the amplifier, the comparator and the actuator, and the negative end is connected with the circuit ground wire; the sensing electrode is connected with the amplifier by a third capacitor C3; the amplifier, thedetector, the comparator and the actuator are connected in sequence and are respectively connected with the circuit ground wire; the container ground wire and the circuit ground wire are not directlyconnected with each other; and the container ground wire and the circuit ground wire are respectively connected with the protecting ground wire.

Description

technical field [0001] The invention relates to the field of household appliances, in particular to a noise-type anti-electric shock and anti-dry heating device for an electric water heater. Background technique [0002] Electric water heaters have long been a household appliance in many families, bringing great convenience to the electrified family life. The existing electric water heaters are divided into two types: water storage type and instant heating type. But two types of electric water heaters of water storage type and instantaneous heating type, an important technical problem that it must solve is to prevent electric shock from hurting people, and another important problem is the safety problem of preventing dry burning and starting a fire. [0003] The patent application number is 200820164704.2, and the utility model patent application titled "An Electric Shock-proof Water Heater" discloses a water heater electric shock-proof technology, which provides a discharge...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, electric water heaters generally have the disadvantages of large size and high cost due to large mechanical structure or complex control circuit in terms of electric water heater protection.

[0005] There are also common defects in the following two aspects in the aspect of anti-dry burning: 1. Or there is no anti-dry burning function, resulting in a great safety hazard; 2. Or use a semiconductor thermistor NTC or PTC as a sensor and use an anti-"overheating" function To cover the function of preventing dry burning without water

Therefore, this kind of technology can only play the role of preventing "overheating" of temperature, but cannot realize the function of preventing "dry burning without water"

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