SU1758695A1 - Device for protection of heater for water boiling - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for protection against unacceptable heating by electric current. The purpose of the invention is to increase the reliability of the device operation. The device contains a level sensor in the form of a float switch, located near the heater and connected to a tripping device. A dome is installed above the sensor, covering the heater by area. The top of the dome is equipped with a float valve. The device turns off the heater not only when the water level drops unacceptably, but also after boiling water with periodic re-activation of 1 or more

Description

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The invention relates to electrical engineering, in particular, to devices for protection against unacceptable heating by electric current.

The purpose of the invention is to increase the reliability of the operation of the heater protection device for boiling water.

The drawing shows a portion of a vessel for boiling water with the proposed heater protection device.

The heater 1 is placed in a vessel with water 2. Above the heater 1 a dome 3 is installed, under which a float switch is placed, in particular a reed switch. which is a level sensor consisting of a floating magnet 4 and the reed switch itself 5. At the top of the dome 3 a valve 6 is placed. held by floats 7.

In the absence (boiling) of water in the vessel 2 to the level of the float with the magnet 4, the latter is released and, approaching the reed switch 5, opens its contacts, which can be included in the circuit

supplying heater 1 directly or through an intermediate relay. As a result, the possibility of supplying current to heater 1 is excluded when the water level in vessel 2 reaches heater 1. The functions of the device are not limited to protection. When boiling water its vapors accumulate under the dome 3, their level reaches the float with magnet 4, and then the process until the power to the heater 1 is turned off is the same as when the water level in the entire vessel 2 is reduced. the water under the dome 3 gradually condenses, the float with magnet A separates from the reed switch 5, and the power circuit of heating heater 1 closes again. The process of switching off and switching on repeatedly repeats. Condensation of water under dome 3 considerably limits its boiling off, and repeated switching on continuously keeps the water temperature close to the boiling point. Valve 6 with 7 float

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CAPACITY of filling the entire volume under the dome 3 with air when water is poured into vessel 2: when the water level in the vessel is below the floats 7, valve 6 is open, water freely displaces air from under the dome.

The design described does not exhaust the possible variants of the proposed device for shields. In particular, the reed switch can be replaced by another float switch.

The proposed device, expanding the functionality, provides energy savings by periodically turning off the heater after boiling water and due to the impact of water

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heat generated during condensation of vapors inside the vessel.

Claims (1)

The invention The heater protection device for boiling water, containing a dome installed above the heater and covering it over an area, under which a level sensor is located close to the heater and connected to a disconnecting device, and an air displacement element located at the top of the dome, characterized by In order to increase reliability, the air displacement element is designed as a float valve, the / and valve is located at the top of the dome, and the float is located on the outside of the dome.