JP3089696B2 - Electric heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heating device for heating an object to be heated such as a liquid contained in a metal pipe.

[0002]

2. Description of the Related Art A conventional electric heating device of this type has a configuration as shown in FIG.

As shown in the figure, an insulator 22 wound around a metal pipe 21 containing a liquid such as water has its upper and lower portions fastened by a metal wire 23 for fastening. A heating wire 24 is wound around the outer periphery of the insulator 22, and a terminal of the heating wire 24 is twisted together with a lead wire 26 to a tightened portion 25 of a metal wire 23 for winding to be electrically connected. In order to further secure the electrical connection, the connection portion is engaged with the caulking terminal 27.

[0004] Reference numeral 28 denotes an insulator covering the heating wire 24, 2
Reference numeral 9 denotes a wire for winding the insulator 29.

[0005]

In such a conventional electric heating device, when the power consumption increases, the heating wire 2
4 and the heat conduction and heat radiation from
The temperature of the caulked portion becomes high, so that the caulking force is degraded due to long-term use, causing local abnormal heating, leading to problems such as smoke and ignition.

Further, when the insulator 22 is fastened with the metal wire 24 for tightening, since the metal wire 24 for tightening is strongly twisted, the root of the torsion portion may be weakened and the wire may be broken.
The problem that the insulator 22 comes off and becomes an unsafe state, and the terminal of the heating wire 24 is also twisted with the metal wire 23 for winding, the thin heating wire 24 is more easily cut when it is strongly twisted. There is a problem that the heat wire 24 is disconnected.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an electric heating device capable of preventing local abnormal heating or disconnection of a heating wire without deteriorating a caulking force of a caulking terminal. I have.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an insulator wound around a surface of a vertically installed metal pipe, and a tightening band for winding both ends of the insulator.
And the heating wire wound on the insulator, and supplying power to the heating wire
And the tightening band is along the surface of the metal pipe.
After winding the insulator on both ends, extend
Terminal holding part having a flat part in the outer straight pipe direction of the metal pipe
And open a space in the flat part of the terminal
Form a plurality of cutouts around the end,
The end of the heating wire and the lead wire are welded to the outer tip flat
Things.

Further, a notch is formed in the terminal holding portion, and a heating wire is wound around the notch.

[0010]

According to the present invention, with the above-described configuration, the caulking terminal in which the heating wire and the lead wire are engaged is welded to the terminal holding portion of the tightening band, so that the heat applied to the caulking terminal can be diffused. Therefore, it is possible to eliminate the deterioration of the caulking force of the caulking terminal.

Further, since the heating wire is wound around the notch of the terminal holding portion, it is possible to eliminate a winding deviation of the heating wire.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 by taking a humidifier incorporated in an electric warm air blower as an example.

As shown in FIG. 1, a humidifier 2, a water tank 3, and a water receiving tray 4 are provided in an electric hot air blower main body 1. The water tank 3 is a closed tank, and the water level in the water receiving tray 4 is maintained at a constant level at the outlet 5 of the water tank 3. The humidifier 2 and the water receiving tray 4 are connected by a connection tube 6a,
The level of the water stored in the humidifier 2 is also kept constant.
The humidifier 2 generates steam by heating the water 7 with an electric heating device provided on the outside thereof. Further, the upper end of the humidifier 2 is connected to the steam blow-out section 8 by a connection tube 6b.

[0014] As shown in FIG. 2, the electric heating element device of the humidifier 2 is formed of a corrosion resistant metal such as SUS304, an insulator 10 made of a high heat-resistant mica wound on the metal pipe 9 containing water The upper and lower parts are fastened with a fastening band 11 made of a corrosion-resistant metal such as SUS304. A terminal holding portion 12 is extended from an end of the tightening band 11, and a root thereof is welded by a method such as spot welding 13 to fasten the insulator 10.

A heating wire 14 is wound around the outer periphery of the insulator 10, and a terminal 14 a of the heating wire 14 is wound around the base of the terminal holding portion 12 an appropriate number of times. Then, the wound extension terminal 14b is twisted around the lead wire 15 and caulked by a cylindrical caulking terminal 16 to be electrically connected. The caulking terminal 16 electrically connected in this manner is connected to the terminal holding portion 12.
Are welded 16a by spot welding or the like, and are electrically and thermally connected.

The caulking by the caulking terminal 16 may be temporarily fixed, and the actual electrical connection may be made by spot welding.

Reference numeral 17 denotes an insulator covering the heating wire 14;
Reference numeral 8 denotes a winding wire for winding the insulator 17.

FIG. 3 shows details of the terminal holding portion 12 for winding the terminal 14a of the heating wire 14, and a cutout portion 19 for winding the terminal 14a of the heating wire 14 is provided at the base of the terminal holding portion 12. Have been.

In the above configuration, since the upper and lower portions of the insulator 10 are wound and the terminal holding portion 12 is welded, the tightening band 11 does not receive mechanical stress such as torsion, and there is no fear of cutting. . Thus, an unsafe state due to the insulator 10 falling off can be prevented.

Further, the terminal 14a of the heating wire 14 by turning the terminal holding portion 12 wound by the extension terminal 14b and the lead wire 15 was welded caulking Takashime terminal 16 to the terminal holding portion 12, the terminal 14a and the caulking pin 16 is a terminal holding part 12
Is generated from the heating wire 14 because it is located in the vertical direction.
It does not cause fluid resistance of convection heat and prevents the temperature of the terminal holding portion 12 from becoming high.
And the terminal holding portion 12 is positioned in the natural convection direction.
High temperature
Can be prevented. The terminal 14a of the heating wire 14 is also held at the terminal.
Open a space in the flat part of the part 12 and wind it around the notch 19
The temperature of the terminal 14a also drops due to natural convection
Since the temperature of the terminal holding portion 12 is prevented from increasing, the deterioration of the caulking force due to the thermal influence of the caulking terminal 16 can be prevented, and local abnormal heating and disconnection of the heating wire 14 can be eliminated.

Further, a notch 19 is provided in the terminal holding portion 12, and the terminal 14a of the heating wire 14 is wound around the notch 19, thereby preventing the wound terminal 14a from being displaced or overlapping. This can eliminate disconnection due to local heating of the terminal 14a.

As described above, according to the electric heating device of the embodiment of the present invention, it is possible to eliminate the local heating of the connection portion between the heating wire 14 and the lead wire 15. The power consumption of the humidifier 2 can be increased, and there is also an effect that it is possible to cope with a high humidification amount required in a highly airtight room in a recent house.

[0023]

As is apparent from the above description of the embodiment, according to the present invention, the terminal holding portion is a band-shaped fastening bun.
At the end of the pipe, in the direction of the straight pipe outward of the vertically installed metal pipe.
It is formed to have a flat part, and a heating wire and
Convection heat generated from the heating wire
If the fluid holding force is
In addition to preventing the temperature of the terminal
Is located in the natural convection direction.
It also has a heat dissipation effect and can prevent high temperatures. Also the end of the heating wire
Is also wound with a space in the flat part of the terminal holding part
Therefore, the temperature of the heating wire also drops due to natural convection,
High temperature can be prevented. This can eliminate local abnormal heating and disconnection of the connection between the heating wire and the lead wire. Further, the insulator 10 is wound with a band-shaped fastening band 11.
The strength to wind the insulator 10 is good because it is tightened.
The joining between the insulator 10 and the metal pipe 9 can be ensured.
In addition, a notch is provided in the terminal holding portion, and the heating wire is wound around the notch, so that displacement and overlapping of the heating wire can be prevented, and disconnection due to local heating of the terminal of the heating wire is eliminated. can do. Disconnection can be eliminated. Furthermore, the insulator is wound up with a band-shaped tightening band.
So that the strength to tighten the insulator is also improved,
The joining of the metal pipe can be ensured.

As described above, according to the present invention, it is possible to provide an electric heating device capable of eliminating local abnormal heating of a connection portion and eliminating heat insulation of a heating wire.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an electric hot air blower incorporating a humidifier using an electric heating device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view of the electric heating device.

FIG. 3 is a perspective view of the main part.

FIG. 4 is a partially cutaway side view of a conventional electric heating device.

[Explanation of symbols]

 Reference Signs List 9 metal pipe 10 insulator 11 winding band 12 terminal holding part 14 heating wire 14a terminal 14b extension terminal 15 lead wire 16 caulking terminal 16a welding 19 notch

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroaki Fujii 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 193590 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 3/58 H05B 3/02

Claims (1)

(57) [Claims] 1. An insulator wound around a surface of a metal pipe installed vertically and a winding bar for winding both ends of the insulator.
A command, and a heating wire wound on the insulator, the heating wire
The power supply has a lead wire for supplying power to the
The strip should be shaped like a strip along the surface of the metal pipe
After winding the edge body, it is extended in the outer straight pipe direction of the metal pipe.
Forming a terminal holding portion having a flat portion, and forming the terminal holding portion;
A space in which a space is opened on a flat surface to wind the end of the heating wire
Forming a number of notches, and a flat outer end portion of the terminal holding portion.
An electric heating device in which an end portion of the heating wire and a lead wire are welded to each other .