JPS63201435A - Panel type electric heater - Google Patents

Abstract

PURPOSE:To miniaturize a controller and to increase convenience and safety in the title heating apparatus, by providing a switching element to each heating surface of a plurality of heating surfaces. CONSTITUTION:The temperature of each heating surface 3 is controlled by controlling the supply of power to a heating element 1 by a switching element 5 provided to each heater of a plurality of heating surfaces 3. A controller 17 having the operating button 16 of a power switch is provided at the predetermined corner of a heating apparatus body 12, and a power cord 19 is connected to the controller 17. The heating temperature of a heating surface 3 is sensed by each thermo-sensor 2, each switching element 5 is controlled by each thermo- sensor 2, and each heating unit 9 is controlled at the predetermined temperature. As a structure is such that connected parts by the controller are few so that the controller can be miniaturized, and the convenience and safety of the title heater can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a planar electric heater such as an electric carpet or a wall heater, and in particular has a plurality of heating surfaces that are heated by heating with a heating element. The present invention relates to a planar electric heater in which the temperature of a plurality of heating surfaces can be individually controlled by controlling energization to the heating elements of each heating surface using respective switching elements.

BACKGROUND OF THE INVENTION A conventional sheet heater of this type has a plurality of heating surfaces that are heated by the heating of the heating elements in the heater main body, and a switching element is used to energize the heating elements of the plurality of heating surfaces. A controller is provided at a predetermined corner of the main body of the heater to individually control the temperature of the plurality of heating surfaces, and the controller is connected to the heating elements of the plurality of heating surfaces and the heat generation of each of the heating surfaces. It is constructed by connecting the ends of heat-sensitive bodies that sense the heating temperature of the body, and providing switching elements and the like that respectively control the supply of electricity to the heat-generating bodies of the plurality of heating surfaces.

Problems to be Solved by the Invention In the case of a planar electric heater constructed as described above, a controller provided at a predetermined corner of the main body of the heater controls a plurality of heating elements on the heating surface and each of them. Since switching elements are provided to respectively connect the ends of the heat sensitive elements that sense the heating temperature of the heating elements and to control the supply of electricity to the heating elements of the plurality of heating surfaces, it is difficult to perform the connection work with the controller. Moreover, there is a drawback that the temperature inside the controller rises due to the heat generated by the switching element and the heat generated at the end of the heating element.

The present invention eliminates the above-mentioned drawbacks, and its purpose is to make the connection work with the controller extremely easy, without causing a temperature rise inside the controller, and to make the controller smaller. An object of the present invention is to provide a planar electric heater that can be used in various ways, and has improved usability and safety.

Means for Solving the Problems The present invention has a plurality of heating surfaces 3 that are heated by the heating of the heating elements 1, and energization of the heating elements 1 of the plurality of heating surfaces 3 is controlled by a switching element 5, respectively. The plurality of heating surfaces 3 are controlled by
The switching element 5 is provided on each of the plurality of heating surfaces 3 of a planar electric heater whose temperature can be individually controlled.

Operation: The switching elements 5 provided on each of the plurality of heating surfaces 3 control the energization to the heating elements 1 of the plurality of heating surfaces 3 to individually adjust the temperature of the plurality of heating surfaces 3. This makes the connection work extremely easy and prevents the temperature inside the controller from rising.

EXAMPLE Hereinafter, an example of the planar electric heater of the present invention will be described with reference to the drawings.

The planar electric heater of the present invention has a heating element 1 that generates heat when energized and is arranged in a meandering manner, and is heated by the heat generated by the heating element 1, using a negative characteristic thermistor that senses the heating temperature. One heating surface 3 is formed by arranging the sensing sensor 2, and the heating element 1 of the − heating surface 3 is energized by the sensing sensor 2 or temperature setting in the vicinity of the − heating surface 3. A board on which a switching element 5 with a control pole, such as a thyristor, which is controlled by utilizing the resistance value of the variable resistor 4, is arranged, and the lead wires of the heating element 1φ sensing sensor 2 and the variable resistor 4 are connected to the switching element 5. A heating unit 9 is formed by disposing a case 8 in which the heating unit 7 is molded, and a plurality of heating units 9 (9 in this embodiment) are attached to the heater main body 12 consisting of the front cloth 1° and the back cloth 11. ), and the lead wires of the variable resistors 4 of the respective heating units 90 case 8 are connected to the respective variable resistors 4.). A control circuit 13 for outputting the value set by each of the variable resistors 4; an operating knob 14 for operating each of the variable resistors 4; A power switch 15 for controlling energization to each of the variable resistors 4. A controller 17 having an operating knob 16 for the power switch 15 is provided at a predetermined corner of the heater body 12, and the other end of a power cord 19 having a power plug 18 at one end is connected to the power switch 15 of the controller 17. It is constructed by connecting.

In the above configuration, the heating element 1 is heated to a high temperature (for example, 180° C.) by winding the heating wire 1b around the core 1a as shown in FIG.
The nylon layer 1c is covered with a nylon layer 1c which is melted in the nylon layer 1c, a shorting wire 1d is wound around the nylon layer 1c, and the shorting wire 1d is covered with an insulator 1e.

The circuit configuration of the planar electric heater constructed as described above is as shown in FIG.

Referring to FIG. 4, a power switch 15. Control circuit 13. A series circuit of temperature fuses 22 is connected, and each variable resistor 4 disposed in the controller 17 is connected to each input terminal 13a of the control circuit 13, and an output corresponding to the variable operation of each variable resistor 4 is connected. Output terminal 13 for deriving
The terminals of the board 7 connected to the control poles (gates) of the switching elements (thyristors) 5 of the heating unit 90 case 8 are connected to the terminals of the circuit board 7 via lead wires 23, respectively, to Switching element 5 of case 8 of heating unit 9 and heating wire 1b of heating element 1
Lead the terminal of board 7 connected in series with #i! A heating resistor 29 connected to the controller 17 and connected to the temperature fuse 22 and the control circuit 13 through a heating resistor 29. A series circuit of diodes 30 is connected, and a short circuit wire 1d of the heating element 1 of each of the heating units 9 is connected in series to the series circuit via a lead wire 31. The sensor 2 of each heating unit 9 is connected between the gate and the cathode.

Note that in the above configuration, the control circuit 13
The output set by each variable resistor 4 connected to each input terminal 13a is led out to each output terminal to control each switching element 5 to a predetermined state.

Further, the lead wires 26 and 31 are made of thick wires because the main current flows through them, and the other lead wires 23 are made of thin wires because only the signal current flows therethrough. and lead wire 26
．． 31 is a connection that is commonly used for all heating units 9.

Next, the usage and operating conditions of the planar electric heater configured as described above will be explained with reference to FIG. 4. When the power plug 18 of the power cord 19 is connected to the AC power source 21,
When the power switch 15 of the controller 17 is closed and the resistance value of each variable resistor 4 is set to a predetermined state, an output corresponding to the resistance value set in each variable resistor 4 is output from each control circuit 13. The derived outputs are applied to the control poles of the switching elements 5 of the respective heating units 9 via the lead wires 23, and the respective switching elements 5 generate heat from the heating elements 1. The energization of the wire 1b is controlled in accordance with the resistance value set by each of the variable resistors 4, and the heating temperature of the heating surface 3 of each of the heating units 9 is controlled to a predetermined heating temperature. It is something.

In this case, the heating temperature of the heating surface 3 of each heating unit 9 is sensed by each sensing sensor 2, and each sensing sensor 2 controls each switching element 5, so that the heating temperature of each heating unit 9 is is controlled to a predetermined temperature.

As described above, the heating temperature of the heating surface 3 of each heating unit 9 is set to a predetermined temperature and used.

Next, the safe operation of the planar electric heater configured as described above will be explained.

Now switching element 5. If control becomes uncontrollable due to a failure in the control circuit 13, etc., or if abnormal heating occurs due to external heat, the nylon layer 1c of the heating element 1 of the heating unit 9
is melted, and a negative current is applied to the switching element (thyristor) 5 (AC power supply 21 → temperature fuse 22 → heating resistor 29
→ diode 3o-4 lead wire 31 → short-circuit wire 1d of heating element 1 → heating wire 1b of heating element 1 → lead wire 26 → power switch 15 → negative current flows in the closed circuit of AC power supply 21,
The heating resistor 29 generates heat and heats the temperature fuse 22, and the temperature fuse 22 is blown out to cut off the power to the heating wire 1b of the heating element 1.

In the above embodiment, a case has been described in which the power supply switch 15 controls the power supply to the heating surfaces 13 of all the heating units 9 at once.
The present invention is not particularly limited to the above-mentioned embodiments.

Effects of the Invention Since the planar electric heater of the present invention has the above-described configuration, there are few connection points with the controller, and the connection work with the controller can be performed extremely easily, and the temperature inside the controller does not rise. The controller can be made smaller, improving usability and safety, and the number of terminals in the controller can be reduced, and the heat generated by each switching element can be eliminated from the main body. The energy can be effectively used as a heater, and since the temperature of each heating surface is controlled individually, local heat can be controlled at a lower temperature, making it more It is also advantageous in terms of safety.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional schematic plan configuration diagram showing an embodiment of a planar electric heater of the present invention, and FIG. 2 is a schematic circuit diagram showing an embodiment of the device of FIG. 1. In the drawings, 1 is a heating element, 3 is a heating surface, and 5 is a switching element.

Claims (1)

[Claims] 1. It has multiple heating surfaces heated by heating elements,
In a planar electric heater in which the temperature of the plurality of heating surfaces can be individually controlled by controlling energization to the heating elements of the plurality of heating surfaces by respective switching elements, the heating of the plurality of heating surfaces A planar electric heater characterized in that each of the surfaces is provided with the switching element described above.