JPH0421279Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a PTC heating element heater, and relates to various heaters using a PTC heating element, such as an immersion type heater and a hot plate.

[Prior art] This type of PTC heating element heater uses a heat sink to
C. It had a structure in which the heating element was pressure-bonded and sandwiched with an insulating material in between, and the heat generated by the PTC heating element was conducted to the heat sink, and the heat was radiated from the heat sink.

[Problems to be solved by the invention] In the structure of the above-mentioned PTC heating element heater, the PTC heating element element is pressure-bonded and sandwiched with an insulating material interposed between them, so variations in the thickness of the PTC heating element element, etc.
A region with a low degree of pressure contact is created between the PTC heating element element and the heat sink, resulting in a decrease in thermal conductivity. In particular, in a structure in which the heat sink is case-shaped and a PTC heating element is placed inside, the pressure inside the case increases due to the heat generated by the PTC heating element, and the degree of adhesion between the heat sink and the PTC heating element decreases, resulting in thermal efficiency. There was a problem with the decrease in

The present invention was made in order to solve the above problems, and it was possible to obtain a PTC heating element heater that maintains adhesion between the PTC heating element element and the heat sink sandwiching the PTC heating element, and improves thermal efficiency. It is something.

[Structure of the invention] (Means for solving the problems) The structure of the PTC heater of the invention is such that the opposing main planes of positive temperature coefficient heating elements (PTC heating elements) are sandwiched between heat sinks, A part of the heat sink is bent so as to protrude in the direction of the opposing heat sink, and its tip is welded to the opposing heat sink.

[Function] The structure of the PTC heater of the present invention is that a part of the heat sink is bent so as to protrude in the direction of the opposing heat sink, and its tip is welded to the opposing heat sink, thereby ensuring that the heat sink is attached to the PTC heating element. Because it comes in close contact
Heat from the PTC heating element can be effectively conducted to the heat sink.

[Example] An example of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes a PTC heating element having opposing main planes that are the upper and lower surfaces of a disc or a square. Electrodes 2 and 3 are formed on the mutually opposing main planes of each PTC heating element 1, and each PTC heating element Conductive foils 4 and 5 made of conductive foil such as metal are pressed onto the electrodes 2 and 3 of the element 1, respectively, and heat conductive foils such as alumite made of oxidized aluminum are placed on the outside of both conductive foils 4 and 5, respectively. Good insulation 6,7
The upper heat sink 9 is pressed into contact with the lower heat sink 8 via. At this time, the contact portion between the tip of the protruding portion 10 formed by bending the central portion of the upper heat sink 9 into a V shape so as to contact the lower heat sink 8 and the lower heat sink is welded. Further, the flange portions 11 and 12 are further horizontally bent from the side surface bent from the periphery of the upper heat sink 9, and welded to both the heat sinks 8 and 9.
A sealed case 13 is formed. Also conductive foils 4, 5
The electrode lead wires 14 and 15 are connected to the connection port 1 of the sealed case 13.
It is drawn from 6. Electrode lead wire 14,1
5 is for supplying power to the PTC heating element 1 from the outside. A connection port 16 from which electrode lead wires 14 and 15 are drawn out is completely sealed with a sealing material 17.

Note that the electrodes 2 and 3 of the PTC heating element 1 are not limited to the opposing main planes, and electrodes may be formed on the opposing sides. The configurations 6 and 7 are not limited to the configurations of the above embodiments. Further, the protruding portion is not limited to one location, and the shape and protruding position can be selected as appropriate depending on the configuration, and the protruding portion can be bent not only from one heat sink but also from both heat sinks.

Next, the operation of this embodiment will be explained. The heat sinks 8 and 9 forming the sealed case 13 containing the PTC heating element 1 are connected to the conductive foils 4 and 5 of the PTC heating element 1.
The heat dissipating plates 8, 9 are held in a press-welded state by the protruding portion 10 through the insulating materials 6, 7, and even if the inside of the sealed case 13 becomes high temperature due to the heat generated by the PTC heating element 1, the heat dissipating plates 8, 9 are kept in contact with the conductive foil 4, 5 and through insulating materials 6 and 7
PTC is maintained in pressure contact with the PTC heating element 1.
The heat sinks 8 and 9 effectively heat the TC heating element 1.
heat is conducted to.

[Effects of the invention] According to the invention, the PTC heating element can be kept in pressure contact with the protruding part of the heat sink through the insulating material and the conductive foil, and when the PTC heating element generates heat, the heat spreads the heat sink. It is not separated from the PTC heating element due to thermal deformation, and the heat generated by the PTC heating element can be effectively conducted to the heat sink, thereby increasing thermal efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a PTC heating element heater showing an embodiment of the present invention. 1... Heating element, 2, 3... Electrode, 4, 5...
... Conductive foil, 6, 7 ... Insulating material, 8, 9 ... Heat sink, 10 ... Projection part, 11, 12 ... Flange part, 13 ... Sealed case, 14, 15 ... Electrode lead wire, 16 ... Connection port, 17 ... Seal material.

Claims (1)

[Scope of utility model registration request] Opposing main planes of positive temperature coefficient heating element (PTC heating element) are sandwiched between respective heat sinks, and a portion of the heat sink is bent so as to protrude in the direction of the opposing heat sink, and the tip thereof is placed on the opposing heat sink. A structure of a PTC heater characterized by welding.