JPS5833668Y2 - Tsutsugatahita - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a cylindrical heater.

Traditionally, cylindrical heaters used in dry hair irons, etc., have a heater such as nichrome wire stretched around an appropriately shaped insulator fitted into a metal cylinder, and the metal cylinder is heated by the heat of this heater. It had become.

In this type of conventional device, the heating time was long and the temperature was controlled by turning on and off a switch such as a thermostat, so there were many variations in the cylindrical surface temperature.

This idea uses a positive temperature coefficient thermistor sandwiched between two electrode plates as a heating element to heat the cylinder, and this heating element is sandwiched between two electrode plates fixed to an insulating spacer. The entire heating group is surrounded by an insulating sheet, which is sandwiched between heat conductive plates and inserted into the cylinder, thereby creating a simple, easy-to-manufacture, and excellent product that does not have the above-mentioned drawbacks. The object of the present invention is to provide a cylindrical heater with a novel configuration that has high performance.

An embodiment of this invention will be described below with reference to the drawings.

In FIGS. 1 to 3, 1 is a cylinder made of metal such as aluminum and is closed at one end, and 2 is a heating section housed within the cylinder 1. As shown in FIGS.

In the heating section 2, 3 and 4° 5 are, for example, disc-shaped positive temperature coefficient thermistors, and 6 and 7 are flat electrode plates fixed to the insulating spacer 16 with, for example, eyelets 17. Positive characteristic thermistor 3, 4.
5 are sandwiched and electrically conductively connected.

Reference numeral 8 designates another spacer made of an electrically insulating material at the other end of the electrode plates 6 and 7 to maintain the distance between them.

Reference numeral 9 denotes an insulating sheet provided so as to surround the entire heating section 2 configured as described above, and is formed of a resin tube such as silicone rubber, a film, glass fiber cloth, or the like.

10.11 is a cylinder 1 with a heating part 2 in between so as to transfer the heat generated from the positive temperature coefficient thermistors 3 and 4.5' to the cylinder 1.
It is a heat conductive plate housed inside.

The heat conduction plate 10.11 is composed of a hollow semicircular aluminum plate, etc., and is divided into two by a slit 12 at the central apex of the arc portions 10a, lla, so that the arc portion has elasticity. This arc portion is in contact with the inner surface of the cylinder 1.

Further, the flat bottom surfaces 10b, llb of the heat conductive plate 10.11 are in contact with the flat portion of the insulating sheet 9.

Note that the heat conduction plates 10 and 11 do not need to have slits, and a suitable heat conductor may be filled in the space between the heating section 2 and the inner surface of the cylinder body 1.

The heating part 2 and the heat conduction plate 10.11 are made of an appropriate end member 1.
3 is enclosed in the cylinder 1.

Further, lead wires 14 and 15 are connected to the ends of the electrode plates 6 and 7 using crimp terminals or the like.

In the above configuration, when a suitable voltage is applied to the electrode plates 6 and 7, this voltage is applied to each positive temperature coefficient thermistor 3°4.5.

As a result, each positive temperature coefficient thermistor 3, 4.5 generates heat, and this heat is transferred to the heat conductive plate 1 via the electrode plates 6, 7 and the insulating sheet 9.
0.11, and the cylinder 1 is heated.

When the temperature of the cylinder 1 is low, the positive temperature coefficient thermistors 3, 4 .
The temperature of cylinder 5 is also low, a large current flows, and the amount of heat generated is large, so that cylinder 1 rapidly rises to a predetermined temperature.

After the cylinder 1 reaches a predetermined temperature, it is maintained at a constant temperature by the self-temperature control function of the positive temperature coefficient thermistor.

As described above, since this invention uses a positive temperature coefficient thermistor as the heating element of the cylindrical heater, the temperature of the cylindrical body can be raised to a predetermined temperature extremely rapidly, and the temperature of the cylindrical body can be maintained at a constant temperature without variation.

In addition, since the PTC thermistor sandwiched between two electrode plates can be sandwiched between heat conductive plates via an electrical insulating sheet and then fitted into the cylinder, it is extremely easy to manufacture and can be manufactured at low cost.

Furthermore, since it does not have a contact mechanism for temperature control, it is possible to provide a cylindrical heater with an extremely long life.

Furthermore, since the positive temperature coefficient thermistor and the electrode plate are entirely surrounded by an insulating sheet and integrated, it is extremely easy to incorporate them into the cylinder, and the gaps on both the left and right sides of both electrode plates are surrounded by the insulating sheet. Therefore, even if the PTC thermistor slips out from between the two electrode plates, accidents such as the PTC thermistor coming into contact with the conductive cylinder (short circuit accident) can be reliably prevented. Because it is integrated, for example, even if the inner diameter of the cylinder body is different, the heating part is the same and it can be assembled by replacing only the heat conductive plate.
It has various advantages.

The cylindrical heater of this invention can be used for a hair iron by wrapping it around hair, and can also be used for various other purposes.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of this invention, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a perspective view showing the connection between an electrode plate and a lead wire. 1... Cylindrical body, 2... Heating part, 3, 4,
5...Positive characteristic thermistor, 6,7...
Electrode plate, 9...Insulating sheet, 10°11...
...Heat conduction plate, 16...Insulating spacer.

Claims (1)

[Claims for Utility Model Registration] A thermally conductive material is created by superimposing heat exchanger plates on both sides of a heating section consisting of a positive temperature coefficient thermistor sandwiched between a pair of flat electrode plates facing each other via an electrical insulator. In the cylindrical heater fitted into a cylinder made of 1
The heating section 2 is entirely surrounded by an insulating sheet 9, and is a flat plate facing the electrode plates 6, 7 through the insulating sheet 9. A cylindrical heater characterized in that it is inserted into the cylindrical body 1 while being sandwiched between heat conductive plates 10 and 11 having a semicircular portion and a semicircular portion that elastically contacts the inner surface of the cylindrical body 1.