JPS5934069Y2 - heating element device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating element device using a positive temperature coefficient thermistor (PTC thermistor), and an object thereof is to provide a highly reliable heating element device whose terminals are securely fixed and strong.

A heating element device using a positive temperature coefficient thermistor arranges thin plate-like positive coefficient thermistors and applies a voltage to them to generate heat.
Air is passed between them and the air is heated.

Since it uses a positive temperature coefficient thermistor as a heat source, it has a self-temperature control function and is a safe heating element device that does not overheat.

The conventional structure of this heating element device is shown in FIGS. 1 and 2.

FIG. 2 is a partial cutout of FIG. 1.

Reference numeral 1 denotes a thin plate-like positive temperature coefficient thermistor, and electrodes 2 and 3 made of sprayed aluminum or the like are formed on both end faces of the thermistor.

4 is a cylindrical insulator made of phenol resin or the like.

A large number of positive temperature coefficient thermistors 1 are fixed at regular intervals inside the insulator 4 with epoxy adhesive (not shown) or the like.

Reference numeral 5.6 denotes a common electrode of a brass plate, which is conductively connected to the electrodes 2 and 3 of the PTC thermistor 1 using a conductive adhesive (not shown) so that each of the PTC thermistors 1 is connected in parallel. has been done.

Further, both ends thereof are fixed with an epoxy resin adhesive 7.

The structure of such a heating element has the following drawbacks.

(1) Since adhesive is used to fix the common electrodes 5 and 6, which form the terminal board, and the insulating frame 4, there are many factors that affect the adhesive strength (flatness of the terminal board and insulating frame, (contamination, amount of adhesive, drying time, etc.), and the adhesive strength varies widely, making the quality unstable.

(2) The assembly process involves many steps such as applying adhesive, attaching terminal boards, temporarily fixing, curing adhesive, and correcting protruding adhesive, which requires a lot of man-hours and is expensive.

(3) Since it is used in a heating element device, a heat-resistant adhesive must be used, and it is difficult to select an adhesive that satisfies adhesive strength, heat resistance, and workability and cost.

As described above, it has been found that the conventional heating element device is extremely inconvenient for mass production.

In view of these drawbacks, the present invention enables fixing of the common electrode without using an adhesive, and the present invention will be explained with reference to the drawings.

FIG. 3 is an assembly diagram of an embodiment of a heating element device according to an embodiment of the present invention.

Reference numeral 10 denotes a cylindrical insulating frame made of heat-resistant phenolic resin or the like, and a large number of thin plate-like positive temperature coefficient thermistors 11 are fixed to the inside of the frame by arranging them at regular intervals using epoxy adhesive (not shown).

FIG. 4 shows a thin plate-shaped positive temperature coefficient thermistor, and electrodes 12 and 13 made of sprayed aluminum or the like are provided on both end faces.

14 and 15 are common electrodes of positive temperature coefficient thermistors, which are made of brass.

A conductive adhesive 16 is adhered to the inner portion of 14 and 15 that contacts the positive temperature coefficient thermistor.

Insert the feet 18 of the common electrodes 14 and 15 into the elongated holes 19 made in the insulating frame 10, and
8 in the direction of arrow C, the common electrode 14,
15 is securely fixed to the insulating frame 10.

FIG. 5 shows a common electrode 14°15 which is another embodiment of the present invention.
A part of the insulating frame 10 is caulked so as to be folded into a part 10a of the insulating frame 10, and is fixed to the insulating frame 10.

Further, the common electrode shown in FIG. 5 is provided with a faston terminal 20 to facilitate external connection.

FIG. 6 is a diagram of a common electrode portion of yet another embodiment.

Reference numerals 14 and 15 denote brass plates, which are also caulked so as to enclose a part of the insulating frame 10, as in the embodiment shown in FIG.

21 is an annealed copper wire, which is welded to 14.15.

As in this embodiment, only the portion of the positive temperature coefficient thermistor that comes into contact with the electrode may be made of a different material.

As described above, according to the present invention, since the common electrode is fixed by mechanical means such as twisting or caulking, the fixing is reliable and there is little variation.

Furthermore, compared to fixing with adhesive, there is no need for painting or curing processes, and assembly can be completed in a shorter time.

Furthermore, there is no need to consider the heat resistance of the adhesive.

Therefore, a heating element device with less variation in quality can be provided at a low cost.

In this manner, the present invention greatly contributes to inexpensive mass production of heating element devices of stable and uniform quality.

[Brief explanation of the drawing]

Figures 1 and 2 are an external view and partially enlarged view of a conventional heating element device, Figure 3 is an exploded perspective view of a heating element device according to an embodiment of the present invention, and Figure 4 is a schematic diagram of a heating element element. 5 is an external view of a heating element device according to another embodiment of the present invention, and FIG. 6 is an external view of another example of a common electrode used in the present invention. 10...Insulating frame, 11...Positive characteristic thermistor, 12°13...Electrode, 14.15.
...Common electrode, 17.1B...Foot part, 1
9... Long hole.

Claims (1)

[Scope of utility model registration request] A plurality of thin plate-shaped positive temperature coefficient thermistors for heat generation are installed at predetermined intervals inside the insulating frame, and a part of a common electrode connecting the thermistors in parallel is fixed to the insulating frame by mechanical means. A heating element device.