The automatic cut-off of the heating element of the kettle
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.
ClaimsThe 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
FIELD: electrical engineering; electric heating elements for overheat-protected tubular electric heaters.
SUBSTANCE: heating element of first design alternate has high-resistivity metal wire spiral, heat-responsive section in the form of easy-melting metal alloy tube, metal plug inserted in spiral at its end disposed on heat-responsive section end, and contact in the form of metal tube secured thereon, partially fitted onto heat-responsive section, and rigidly fixed thereto. Spiral turns are joined together on length from end of spiral to at least plug to form rigid part of spiral. This rigid part is partially fitted onto heat-responsive section and joined to the latter so that distance through symmetry axis between rigid part of spiral and contact ensures opening of heating element circuit when heat-responsive section temperature exceeds critical value equal to melting point of its material. As an alternative, heat-responsive section may be soldered to metal plug. Heating element of second design alternate has two high-resistivity metal wire spirals and heat-responsive section is installed on two ends just as in first design alternate.
EFFECT: simplified design, reduced operating time of heat-responsive section.
4 cl, 8 dwg
FIELD: automation; periodic turn-on of actuating mechanisms of ac automatic-control devices.
SUBSTANCE: proposed defrosting timer has power supply, time counter, heater, end-of-defrosting sensor, compressor, first rectifier, first and second dropping components, and three-contact relay; movable contact of the latter is connected to second pole of power supply; count input of time counter is connected through heater to second fixed contact of relay and through end-of-defrosting sensor, to first pole of power supply. Common lead of time counter is connected to first fixed contact of relay and through compressor, to first pole of power supply. Inputs of first rectifier are inserted between fixed change-over contacts of three-contact relay through first dropping component; output of first rectifier is connected to that of time counter through series-connected threshold element and relay coil. Newly introduced in timer is second rectifier one of whose inputs is connected through second dropping component to second pole of power supply, and its other input is connected to first fixed contact of relay; second rectifier output is connected to time counter output also through series-connected threshold element and relay coil.
EFFECT: reduced power requirement due to lower operational loss and enlarged functional capabilities of timer.
1 cl, 1 dwg
FIELD: thermal equipment.
SUBSTANCE: main parts of boiler are organized in a new way inside its case. Boiling chamber is placed inside boiled water collector and it has stationary bottom provided with holes for mounting and fixing electric-heater elements. Reflector is made in form of glass and is disposed inside boiling chamber coaxially with the chamber. Axes of boiling chamber of boiled water collector are shifted relatively each other as well as relatively axis of supplying box to one side. Float units are mounted inside free space between boiling chamber and supplying box. Automatic starting unit is disposed under bottom of boiled water collector; the starting unit is connected with water level control detector disposed in supplying box and in boiled water collector. Starting unit is made in form of magnet-controlled contact.
EFFECT: improved efficiency of operation due to improvement in reliability and service life.
3 cl, 20 dwg
FIELD: automatics, namely devices for automatic periodic connection of actuators of AC apparatuses such as refrigerators.
SUBSTANCE: timer includes time counter 1; three-contact electromagnetic relay 2; threshold unit 3; power supply rectifiers 4,5; switching contacts of relay 8; hater 9; thawing ending sensor 10, compressor 11, poles 12, 13 of power source. Use of two half-wave rectifiers allows to arrange circuit elements closer one relative to other while satisfying safety demands.
EFFECT: improved design, enhanced operational reliability.
FIELD: domestic electric heating devices supplied for mains and moving during their use, for example fans, irons, folders and so on, possibly with automatic cut-off after motion end.
SUBSTANCE: device includes heating unit 1 connected in series with connection electric cord 2, with power supply breaker 3 and with plug 4 for connection with mains. Power supply breaker 3 is connected with pickup 5 detecting change of electric cord position. Pickup 5 and electric cord are mutually combined in the same sheath 6. Breaker 3 includes connected in series one to other circuit 7 for analyzing resistance and detecting resistance change of pickup; OR-gate 8, timer 9, power switch 10.
EFFECT: enhanced safety of electric heating device.
3 cl, 2 dwg
FIELD: heat and power engineering, namely apparatuses for heating electrically conducting liquids, mainly water for heating and hot water supply of buildings.
SUBSTANCE: method comprises steps of controlling boiler operation at initial stage according to consumed electric current by controlling liquid supply to boiler; after achieving predetermined temperature of liquid in heating system or air temperature in room controlling boiler operation according to temperature. Apparatus for performing the method includes microcomputer with power source, temperature pickups, pickup for measuring electric current consumed by boiler, unit for displaying and parameter inlet, circuit for measuring consumed current, pump control switch, buffer device for controlling circuits of electric boiler, emergency signaling unit.
EFFECT: shortened time period for achieving nominal power of boiler.
4 cl, 2 dwg
FIELD: thermo-power engineering.
SUBSTANCE: method includes connection of group of electric heating means of consumer to common electric power grid with limited load capacity, with use of control block, performing control of operation of electric-heating devices in preset order, adjusting total power of electric-heating devices.
EFFECT: higher quality, higher durability.
FIELD: examination of liquid (L) at variation of temperature or pressure, applicable in domestic electroheaters.
SUBSTANCE: the device (D) has a vessel (V) for L, heating element (HE) and a control system of the HE. The control system (CS) has a primary transducer and an actuating member. The novelty is in making of the primary transducer in the form of a sensor (S) for measurement of the physical quantity characterizing the property of L, for example, of the conductance, dielectric constant, it is positioned in point V or HE. The device may have a means of protection of HE against excess of temperature and consumed current installed in contact with HE. The CS is installed on the HE. The vessel in the device may be made of the flow-through type, and the HE - of the immersion type.
EFFECT: the distinguishes expand the potentials of the D by excluding the dependence on temperature, shape and dimensions of the vessel, as well as increase the range of the examined liquids and the depth of these examinations.
6 cl, 3 dwg
FIELD: electric heating appliances for building into building constructions and meant for heating rooms, surfaces of pavements, stadiums, roofs, buildings, pipelines, reservoirs and etc.
SUBSTANCE: adjustable cable heater has adjuster, connecting cables, connecting sleeves and at least one heating cable, ends of which via connecting sleeves are connected to first ends of connecting cables, and second ends of connecting cables are connected to adjuster. In accordance to invention heating cable has at least one additional wire of electric-conductive material, and cable cover is made of material with temperature-depending electro-physical properties. Ends of additional wire are connected to adjuster.
EFFECT: decreased energy consumption, increased reliability of device.
FIELD: electric heating devices.
SUBSTANCE: proposed protective device designed for overload and overtemperature protection of electric heating element has temperature controller installed in insulating base and connected by means of its leads to external plug and to electric earing element. Bimetal sensing element contacts flange of electric heating element and is pressed to the latter by means of temperature-controller flexible leads.
EFFECT: enhanced reliability of thermal contact between bimetal sensing element and electric heating element.
1 cl, 1 dwg