JPS6230312Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvement of a planar heater, particularly a planar heater that generates heat at a high temperature.

An example of a planar heater is a heater consisting of a heating wire and support plates such as a radiation plate and a reflecting plate placed on both sides of the heating wire. In this heater, the heating wire is arranged in a meandering manner between the radiating plate and the support plate, but during long-term use, the heating wire may shift and the heat distribution may become uneven, or the heating wire may move away from the radiating plate. There was a risk that the heat dissipation efficiency of the separated parts would deteriorate, leading to local overheating and disconnection of the heating wire. In addition, this type of sheet heater, especially when it is of a type that generates heat at a high temperature such as an infrared heater, has the disadvantage that the radiation plate is curved due to large thermal expansion and its mechanical strength is reduced. If a planar heater with a small area is formed in order to prevent such a decrease in mechanical strength, the wiring becomes complicated and expensive, and increasing the thickness of the radiation plate increases the weight and requires the use of various plate thicknesses. It is necessary to prepare a radiation plate.

An object of the present invention is to provide a planar heater that does not cause the heating wire to shift or separate from the radiation plate and has high mechanical strength.

Embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a planar heater 10 according to the invention, and this planar heater 10 includes an electric heating wire 12 and the heating wire. Support plates such as a radiation plate 14 and a reflection plate 16 arranged on both sides of the plate 12,
It consists of a reinforcing member 18 placed on the back side of the reflecting plate 16. In the illustrated embodiment, the reinforcing member 18 is composed of a horizontal angle steel 18A and a vertical angle steel 18B fixed to the horizontal angle steel by welding or the like. The radiation plate 14 has a plurality of bolt-shaped studs 2 passing through the reflection plate 16 and the reinforcing member 18.
0 is planted. In FIG. 2, reference numeral 16a
and 18a are the reflecting plate 16 and the reinforcing member 1, respectively.
This is a bolt through hole provided in the portion facing the reflector plate No. 8. As shown in FIG. 1, each bolt-shaped stud 20 is screwed with a nut 22 to fix the reflecting plate 16 and reinforcing member 18.

As shown in FIG. 2, the plurality of studs 20 are
The heating wires 12 are laid in several rows along a meandering pattern in the illustrated case, and the heating wires 12 are laid in a meandering manner between the rows of these studs 20. The reinforcing member 18 thus tightened by the plurality of studs 20 is attached to the sheet heater 10.
The reflector plate 16 prevents the curvature of the stud 20.
By tightening, the heating wire 12 is pressed against the radiation plate 14, so that the heating wire 12 does not separate from the radiation plate 14, and furthermore, since the stud 20 holds the laying pattern of the heating wire 12, this pattern is not destroyed. .

In the above embodiment, the support plate includes a heat insulating material 24 provided on the back surface of the reflecting plate 16 so as to embed the reinforcing member 18, but this heat insulating material may be omitted. Further, the stud stud 20 may be in the form of a rivet in addition to the form of a bolt, and the reinforcing member 1
8 may be fixed by welding.

According to the present invention, as mentioned above, the heating wire is pressed against the radiation plate by tightening the studs of the support plate, so that the heating wire does not separate from the radiation plate, and breakage of the heating wire can be prevented. Multiple studs installed along the wiring pattern of the heating wires prevent the heating wires from shifting, allowing heat to be radiated with uniform heat distribution, and the reinforcing member prevents a decrease in mechanical strength, especially at high temperatures. Therefore, it is suitable for infrared sheet heaters, and since the radiation plate may have low mechanical strength, the material can be freely selected. As an example, the thickness 1 after surface treatment
The reinforcing member shown in Fig. 2 consisting of a stainless steel radiation plate of 0.5 mm thick, a stainless steel reflector plate of 0.5 mm thickness, and an angle steel, and a heat insulating material of ceramic fiber 125 mm thick were assembled as shown in Fig. 1. Capacitance
8kw, 1m x 1m planar heater on the surface
Although it was heated to ℃, there was almost no warpage, but when the same structure was used but the reinforcing member was omitted, the warpage was approximately 1
It was confirmed that warpage of cm had occurred.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional view and an exploded perspective view of a planar heater according to the present invention. 10... Planar heater, 12... Heat generating wire, 14...
... Radiation plate, 16 ... Reflection plate, 18 ... Reinforcement member,
18A...Horizontal angle steel, 18B...Vertical angle steel, 20...Stud, 22...Nut.

Claims (1)

[Claims for Utility Model Registration] (1) In a planar heater consisting of a heating wire and a radiation plate and a supporting plate arranged on both sides of the heating wire, a reinforcing member arranged on the back side of the supporting plate. A planar heater further comprising: the radiation plate having a large number of studs provided along the laying pattern of the heating wires, passing through the support plate and the reinforcing member, and fixed to the reinforcing member. . (2) The planar heater according to claim 1, wherein the reinforcing member comprises a horizontal angle steel and a vertical angle steel fixed to the horizontal angle steel.