JPH0345878B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Prior Art] The present invention relates to a heater for a hot air machine used in a hair dryer or the like.

[Background technology]

Conventionally, as shown in FIGS. 21 to 23, this type of heater has been made by winding a ribbon-shaped heater wire 30 formed into a wave shape around a cross-shaped substrate 31, or as shown in FIGS. 24 and 25. A heater wire 30', which is a wire wire formed into a coil shape, is similarly wound around a cross-shaped substrate 31, as shown in FIG.

However, in either case, since it is wrapped around the board 31, stress is always applied to the contact part with the board 31, and since it is bent at an acute angle, there is always the possibility that the stress will concentrate and the wire will break. I'm reading. Further, in the waveform shown in FIG. 21, since the contact area with the substrate is large, the cooling effect is small, and there is also a drawback that the contact portion 30a (FIG. 22) becomes red hot. In the coil heater type shown in FIG.
Since the structure is to be placed on top of the board and wrapped around it, the board 3
1 had to have a large thickness t, which caused the contact portion with the substrate 31 to be in the shadow, making it difficult for cooling air to reach it, which led to the disadvantage that it was likely to become red hot.

[Purpose of the invention]

An object of the present invention is to provide a heater for a hot air machine that is free from stress concentration and can be cooled uniformly.

[Disclosure of the invention]

In this invention, a heater wire is fixed to one side of a flexible insulating plate, and the heater wire is wound with the flexible insulating plate inside.

According to this configuration, since the heater wire is evenly supported over a wide range by the flexible insulating plate, there is no concentration of stress and therefore there is no fear of wire breakage. In addition, since it is evenly supported over a wide range, overheating can be prevented from occurring locally at the contact portion. Furthermore, since the heating wire is fixed and wound on one side of the flexible insulating plate, compared to, for example, the heating wire inserted into a support having a spiral groove as in Japanese Utility Model Application Publication No. 53-112841, It becomes easier to manufacture heaters for hot air machines. Moreover, since the flexible insulating plate is wound on the inside of the heater wire, the number of waveforms or coil turns of the heater wire is smaller than when the flexible insulating plate is wound on the outside of the heater wire. At most, there is no short circuit between the wave fronts, so the characteristics of the heater wire do not change.

Embodiment An embodiment of the present invention is shown in FIGS. 1 and 2. In this example, a ribbon-shaped heater wire 1 formed into a wave shape is fixed to one side of a flexible insulating plate 2, and is wound in the Q direction in Fig. 2 with the flexible insulating plate 2 inside to form a roll. It is.

With this structure, the wires are not wound around a cross-shaped substrate as in the past, but are wound evenly in a cylindrical shape, so there is no concentration of stress and there is no fear of wire breakage. In addition, the contact part with the insulating plate 2 is
Since the heating wire 1 is in point contact with only the peaks of the wave ridges, cooling air can pass through easily, heat exchange is also good, and red heat is hardly generated. Furthermore, since the heater wire 1 can be wound concentrically, a hot air blower using the heater wire 1 can be miniaturized, and since it can be wound spirally from the center, the hot air distribution can be made uniform. Furthermore, since the heater wire 1 is fixed and wound on one side of the flexible insulating plate 2, it is easier to manufacture a heater for hot-air machines than when the heating wire is inserted into a support having a spiral groove. Become. Moreover, since the flexible insulating plate 2 is wound on the inside of the heater wire 1, the number of waveforms of the heater wire or the coil Even if the number of turns is large, there is no short circuit between the wave crests, so the characteristics of the heater wire 1 do not change.

In Figures 3 and 4, at the center of the heater winding,
An example in which a cylindrical winding core 3 is provided is shown.

FIG. 5 shows an embodiment in which a board 5 with a thermoswitch 4 attached is provided in front of the heater of the example shown in FIG. This is an example. W indicates the direction of air blowing. FIG. 20 shows an example of a hair dryer incorporating the heater of the example shown in FIG. In the figure, 8 is a casing, 9 is a heater, 10 is a motor, 11 is a fan, 12 is a switch, and 13 is a cord.

FIGS. 6 and 7 show wave-shaped heater wires 1a,
1b are arranged in two rows on the flexible insulating plate 2. The pitches of the wave crests of the heater wires 1a and 1b in both rows are shifted from each other. This increases heat exchange and improves air blowing efficiency. In addition,
Although the figure shows the state before winding, it is wound in a spiral shape as in the first embodiment.

8 and 9 show examples in which a flexible insulating plate 2 to which a heater wire 1 is fixed is wound spirally around a cross-shaped substrate 14. At the beginning and end of winding, the heater wire 1 is fixed to the cross-shaped substrate 14 by the terminal 15. The heater wire 1 is a ribbon shaped wire shaped into a wave shape.

10 to 12 show an example in which one end of the flexible insulating plate 2 is a C-ring-shaped hard ring 17 that is integrated with other parts. This hard ring 17 is wound around the center. Thereby, the entire structure can be supported by the hard ring 17.
As shown in FIG. 13, the hard ring 17 may be formed separately from the flexible insulating plate 2, and one end of the hard ring 17 may be inserted into the slit of the hard ring 17'. The heater wire 1' is made by winding a round wire into a coil around a round rod 18 as shown in FIG. 12A. Even if such a coiled heater wire 1' is used, the same effect as the wave-shaped heater wire 1 can be obtained. Note that in the example of FIG. 10 as well, a wave-shaped heater wire may be used. Furthermore, as shown in FIG. 12B, a rectangular coil-shaped heater wire 1' made by winding a rectangular wire around a rectangular rod 19 may be used. In this case, fixing to the flexible insulating plate 2 is easy.

14 and 15 show an example in which the heater wire 1 is wound together with the flexible insulating plate 2 around the terminal 20 of the heater wire 1 as the winding core. The terminal 20 is a plate-shaped material wound into a cylindrical shape, and can be easily wound. Further, the terminal 20 is provided with a caulking portion 21 so that the heater wire 1 and the lead wire 23 can be caulked and fixed. Although this embodiment shows a case in which two heater wires 1 are connected in parallel, the position and shape of the caulking portion 21 of the terminal 20 may vary depending on the number of heater wires 1 arranged and whether the heater wires 1 are arranged in parallel or in series. Of course it will come. Note that a temperature controller such as a thermoswitch 22 may be directly fixed to the terminal 20 as shown in FIGS. 16 and 17. 21' is a caulking part.

18 and 19 show the wave-shaped heater wire 1
An example is shown in which the peak height h is gradually changed so that it becomes lower at the start and end of the winding.

If the peak height h is uniform, a space without heater peaks, indicated by Z in the front view of Figure 1, will occur at the beginning and end of heater winding, and this will cause the hot air distribution (the Z part will be lower). There are disadvantages in that unevenness tends to occur and the shape of the insulating plate is difficult to form into a uniform cylindrical shape. However, according to the example heater shown in FIG. 18, since the height of the peak is low at the beginning and end of the winding, the above-mentioned space without the heater peak does not occur, and the unevenness of hot air is eliminated. Further, the flexible insulating plate 2 has a uniform cylindrical shape, which has the advantage that it can be smoothly attached to the dryer.

〔Effect of the invention〕

The heater for hot air machines of the present invention is free from stress concentration and can prevent local overheating. Furthermore, since the heater wire is fixed and wound on one side of the flexible insulating plate, it is easier to manufacture a heater for a hot-air blower compared to one in which a heating element is inserted into a support having a spiral groove. Moreover, since the flexible insulating plate is wound inside the heater wire,
Compared to a case where the flexible insulating plate is wound on the outside of the heater wire, there is no short circuit between the wave crests even if the number of waveforms or coil turns of the heater wire is large, so the characteristics of the heater wire do not change. There is an effect that there is no.

[Brief explanation of drawings]

FIG. 1 is a front view of one embodiment of this invention, FIG. 2 is a developed view thereof, and FIG. 3 is a front view of a second embodiment.
4 is a developed view thereof, FIG. 5 is a perspective view of the third embodiment, FIG. 6 is a perspective view of the fourth embodiment in the developed state, FIG. 7 is a front view of the fourth embodiment in the developed state, and FIG. The figure is a front view of the fifth embodiment, FIG. 9 is a side view thereof, FIG. 10 is a front view of the sixth embodiment, FIG. 11 is a developed view thereof, and FIGS. 12A and B are the heaters thereof. An explanatory diagram of the wire manufacturing method, FIG. 13 is a developed view of the seventh embodiment, FIG. 14 is a front view of the eighth embodiment, FIG. 15 is a perspective view of the developed state, and FIG. 16 is a developed view of the ninth embodiment. FIG. 17 is a front view of the embodiment, and FIG. 17 is a perspective view of the developed state.
Fig. 18 is a front view of the tenth embodiment, Fig. 19 is a developed view thereof, Fig. 20 is a sectional view of a hair dryer incorporating the heater of the embodiment shown in Fig. 5, and Fig. 21 is a conventional example. Front view, Figure 22 is a partially enlarged view, Figure 2
3 is a partial side view of the same substrate, FIG. 24 is a front view of another conventional example, and FIG. 25 is a partial side view of the cross-shaped substrate. 1, 1a, 1b, 1'... Heater wire, 2... Flexible insulating plate, 3... Winding core, 14... Cross-shaped substrate, 17... Hard ring.

Claims (1)

[Claims] 1. A heater for a hot-air machine, in which a heater wire is fixed to one side of a flexible insulating plate and wound around the flexible insulating plate on the inside. 2. The heater for a warm air machine according to claim 1, wherein a winding core is inserted into the center of the winding of the flexible insulating plate. 3. The heater for a hot air machine according to claim 1, wherein the flexible insulating plate is spirally wound. 4. The heater for a hot air machine according to claim 1, wherein the flexible insulating plate is wound around a cross-shaped substrate. 5. The heater for a hot air machine according to claim 1, wherein one end of the flexible insulating plate is a hard ring. 6. The heater for a warm air machine according to claim 1, wherein the flexible insulating plate is wound around the terminal of the heater wire as a winding core. 7. A thermoswitch board is provided in front of a wound body in which the flexible insulating plate is wound together with a heater wire, and a voltage dividing resistor board is provided in the rear, and the wound body is sandwiched between these boards in a sandwich-like manner. The heater for a hot-air machine according to item 1. 8. A plurality of rows of the heater wires are provided on the flexible insulating plate spaced apart from each other in the width direction, and the heater wires are formed into a wave shape, and the positions of the crests of the waves are shifted in each row. The heater for a hot air machine according to item 1. 9. The heater for a hot-air machine according to claim 1, wherein the heater wire is corrugated, and the height of the wave crest is gradually changed so that both ends of the flexible insulating plate are lowered.