The automatic cut-off of the heating element of the kettle


H01H35/18 - Switches operated by change of liquid level or of liquid density, e.g. float switch (by magnet carried on a float H01H0036020000)

 

The invention relates to the field of household appliances, in particular the production of electric kettles. To improve the reliability, durability, ease of construction on the heating element 2 of the kettle has a metal casing 3 with an opening 4, inside the housing 3 has a float 5 with the rod 6 and a fixed permanent magnet 8 and the outside of the housing 1 of the electric installed the switch 9. 4 Il.

The invention relates to the field of household appliances, in particular the production of electric kettles.

Known automatic cut-off of the kettle, in which the signal from the sensor RK1 is fed to the input of the integrating chains with different constant time, and then to the comparator D. When you press the power button SB1 short-changes the voltage at the input of the integrating chains and the comparator is triggered, including electromagnetic relay K1 when the voltage less than 7V. His contacts K1.1 include a power triacs, through which supplied power to the heater. As soon as the water boils and its temperature is stabilized, the heater is switched off, but with some time delay, dependent on the time constant of the integrating chain R9-C4-R8-C3-R7-Yasnaya fact, for the power circuit of an electric kettle necessary stable power supply and setup of each type of machine.

Known machine off the kettle, comprising a metal casing with a hole in the top, two holes in the bottom. Inside the case there is an electrode insulated from the housing and holder insulator, and the float valve. The sensor is placed inside the kettle almost above the heater and connected to the electronic device. Together with the sensor, this device forms a machine. When the kettle is filled with water, it penetrates inside of the sensor and expels the air through the top hole. With rising water level, the valve POPs up and coming in the alignment of the upper hole, closes it. Between the sensor housing and the contact electrode current flows due to applied between the voltage and the conductivity of the water. As soon as the water level inside the sensor falls below the contact electrode, the resistance between it and the sensor housing increases dramatically, which will serve as a signal for actuation of the machine and turn off the Heater (see ed. mon. 1348923, IPC N 01 N 35/18, the magazine "Radio" 3, 1991, S. 62).

However, this machine has the following disadvantages: - defects in the AC circuit AC in order to avoid electrolysis of water, dissolution of metals, the complexity of the device due to the use of the power transformer through the winding which flows to the load current of the heating element.

The closest device to the technical nature of the claimed invention is a float switch that contains the caisson with a hole in the top, the guide stop that overlap the upper hole in the extreme upper and lower positions of the stops, the float with permanent magnet and the magnetic contact reed switch. At the time of the boiling liquid is a rapid evolution and the steam is collected in the caisson, displacing the liquid. The float is lowered, and the reed switch opens (see ed. mon. SU 1686523 A1, class H 01 H 35/18, publ. 23.10.1991, BI 39).

The disadvantages of this design are the complexity in manufacturing and Assembly panel design.

Thus the task of the invention is the creation of a sample household appliances - electric kettle with automatic cut-off of the heating element.

The technical result of the proposed design is to improve the reliability, durability, simplifying the design.

The technical result is achieved by the fact that the machine off Nagravision, metal housing with a hole at the top, the guide rod with the possibility of vertical movement along the guide and connected in the upper part of the float, a permanent magnet, reed switch, according to the invention the metal housing mounted on the heating element, the float does not close the holes, the diameter of which is selected with the possibility of removal of air when filling the metal housing of the water and retain the pair in gasification, while the guide for vertical movement of the rod is rigidly connected with the metal housing, the lower part of the stem is connected with a permanent magnet and a reed switch mounted on the outside of the kettle.

The proposed device has the following distinctive features in comparison with the prototype (ed. mon. SU 1686523 A1, class H 01 H 35/8): - cast metal housing on the heating element allows you to capture the vapour bubbles formed by gas - implementation mechanism: the float does not close the holes in the upper part of the metal housing, guide rod, a permanent magnet, the lines of force which closes the contacts of the reed switch enables the removal of air from the metal housing through the top hole diameter, while present in the top position and hold a pair with gases during their passage in the lower position.

Of scientific and technical literature and patent documents, the authors of the present invention showed no device with such distinctive features, ensuring the achievement of the technical result is to simplify the design, improving reliability and durability, which allows to make a conclusion on the conformity of the proposed solutions to the criteria of "novelty" and "inventive step".

The invention is illustrated by drawings, where Fig.1 - shows the automatic cut-off of the heating element of the kettle of Fig.2 is an electrical diagram, in Fig.3: (a) top view Fig.1, b) - elements of the float rod guide made of a metal case.

The automatic cut-off of the heating element of the kettle contains (see Fig.1, 3) of the body of the kettle 1, filled with water, the heating element 2, which is fixed to the metal housing 3 made in the form of a cylinder. At the top of the metal housing 3 made 4 hole, the diameter of which is selected with the possibility of removal of air when filling the metal housing of the water and retain the pair in gasification. Inside the metal housing 3 has a float 5, made in the form of a round disk, the 7, rigidly connected with the metal housing 3, the lower part of the rod 6 is connected with the permanent magnet 8, is made of circular form, the lines of force which closes the contacts of the reed switch 9 mounted on the outside of the housing 1 of the kettle. When the filling of the case 1 water removes air from the metal housing 3 through the opening 4, while the piston rod 6, the permanent magnet 8, the float 5 is installed in the upper position, the float 5 does not close the hole 4.

Electric circuit disconnect the heating element (see Fig.2) contains AC relays with contacts 1R and 1R', the coil (K), calculated for a voltage of 220 V, reed (GK), heating element (RL) of the kettle.

The proposed automatic cut-off of the heating element of the kettle works as follows (see Fig.1, 2, 3).

When completing the housing 1 of the electric kettle with water, the latter penetrates the bottom of the metal shell 3 and removes the air through the top opening 4. The float 5, the spindle 6 and the magnet 8 occupying the upper position, and the float 5 does not close the openings 4. When power is applied, the current through the normally closed contact of relay 1R' forms a power supply circuit of the heating element 2. When boiling in snaut water. The float 5 and rigidly associated with the permanent magnet 8 to the down position. The material from which made the bottom of the kettle, is not magnetic. The lines of force of the permanent magnet 8 close the contacts of the reed switch 9 (Ha). The coil (K), the relay is energized and thus open the contacts 1' and closed contacts 1R, relay becomes on retaining. The heating element 2 of the kettle when it is de-energised. The modern types of relays on the retaining up to 48 hours. The role of the switch executes the provided plug the kettle, or for the convenience of operation of a separate switch. When boiling water or turn on the kettle without water relay automatically becomes the retaining and de-energizes the heating element 2.

The dimensions of a modern relay types allow you to put them in the construction of the machine to turn off the heating element of the kettle, and the use of the reed switch, relay, performed in the production environment can provide a number of positives that are guaranteed by the manufacturer.

The scum formed on the magnet 8, does not affect its properties, it is not magnetized. Temperature demagnetization of the magnet 400oC.

Manufactured experienced abrazyvniy and continues to work.

The proposed structure is designed so that when the Assembly does not require configuration.

The proposed automatic cut-off of the heating element of the kettle in comparison with the prototype (see ed. mon. SU 1686523 A1, class H 01 H 35/18, publ. 23.10.1991, BI 39) has the following advantages: - improved reliability and durability, simplified design, compact size and increase operational qualities - powered switching delay.

Claims

The automatic cut-off of the heating element of the kettle containing the body of the kettle, filled with water, a heating element, a metal casing with a hole at the top, the guide rod with the possibility of vertical movement along the guide and connected in the upper part of the float, a permanent magnet, reed switch, characterized in that the metal housing mounted on the heating element, the float does not close the holes, the diameter of which is selected with the possibility of removal of air when filling the metal housing of the water and retain the pair in gasification, while the guide for vertical movement of the rod is rigidly connected with the metal housing, the lower part of the

 

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