JPH0490423A - Electric heater - Google Patents

Abstract

PURPOSE:To prevent creak or deformation from occurring on each starting or finishing of energization of a heater and obtain an electric heater with low noise and a long useful life, by anchoring a central part of a panel form heater to a bottom plate by a heater anchoring plate, and supporting both ends of the heater by heater support plates. CONSTITUTION:A roughly rectangular panel form heater 2 disposed in a main body casing 1, a heater anchoring plate 3a comprising a metallic plate and disposed at a central part of the heater 2, a bottom plate 4 covering the bottom side of the casing 1, a top panel 5 covering the top side of the casing 1, an intake port 6 formed in the bottom plate 4, an exhaust port 7 formed in the top panel 5, and heater support plates 8 supporting both ends of the heater 2 thereon are provided. Dimensional changes due to repeated expansion and contraction of metallic plates 2a, 2b of the heater 2 on starting and finishing of energization of the heater 2 are dissipated to both sides of the anchoring plate 3a. Therefore, an electric heater with low noise and a long useful life can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application] The present invention relates to a natural convection type electric heater.

[Conventional technology]

FIG. 3 is a sectional view showing an example of a conventional electric heater.

In the figure, 1 is a main body case, 2 is a substantially rectangular plate-shaped heater arranged inside the main body case 1, and a heating wire is attached to the mica core.
For example, two metal plates 2a and 2b are formed by winding a nichrome wire and insulating the core mica with insulating mica, as shown in Fig. 4.
The configuration is such that it is held between the two.

3b is a heater mounting plate made of a metal plate, 4 is the main body case 1
5 is a top panel covering the top surface of the main body case 1; 6 is an air intake port provided on the bottom plate 4; and 7 is an exhaust port provided on the top panel 5.

Next, the effect will be explained. When electricity starts to be applied to the plate heater 2, the plate heater 2 generates heat. As a result, the air inside the main body case 1 is warmed and rises, and is discharged to the outside from the exhaust lower of the upper panel 5 as shown by arrow a, thereby warming the room.

On the other hand, as the hot air is released, cold air from the lower part of the room is drawn into the main body case 1 from the intake port 6 as indicated by the arrow.
It is heated by the plate-shaped heater 2 and rises inside the main body case 1. This causes convection to occur indoors, and the indoor air is heated efficiently.

At this time, the pair of metal plates 2a and 2b, which sandwich the heat generating wire, expand and contract in all directions depending on the temperature each time the plate heater 2 starts and ends energization.

For example, in the case where the heating wire is held between long metal plates 2a and 2b as in this example, the expansion and contraction will be large, and the dimensional difference during expansion and contraction will be caused by the deformation of the plate heater 2 itself and the difference between the plate heater 2 and the plate heater 2. This is absorbed by the mounting play between the heater mounting plate 3b and the like.

[Problem to be solved by the invention]

In the conventional electric heater configured as described above, the dimensional difference in expansion and contraction that occurs each time energization to the plate heater 2 starts and ends is compensated for by the deformation of the plate heater 2 itself and the difference between the plate heater 2 and the plate heater 2. Since the heat is absorbed by the backlash between the heater mounting plate 3b and the like, there are problems such as squeaks and deterioration of characteristics due to deformation.

The present invention was made to solve the above-mentioned problems, and it prevents the squeaks and deformations that occur every time the heater starts and stops energizing, and provides electric heating with lower noise and longer life. The purpose is to obtain a vessel.

[Means to solve the problem]

The electric heater according to the present invention has a heater fixing plate placed in the center and heater support plates installed at both ends.

[Effect]

The electric heater according to the present invention eliminates dimensional differences in expansion and contraction of the heater that occur each time energization to the plate heater starts and ends, and prevents squeaks and deformation of the heater.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of the present invention.

In the figure, 1 is a main body case, 2 is a substantially rectangular plate-shaped heater provided in the main body case 1, 3a is a heater fixing plate made of a metal plate arranged in the center, and 4 covers the bottom surface of the main body case 1. A bottom plate 5 is a top panel covering the top surface of the main case 1, 6 is an intake port provided on the bottom plate 4, 7 is an exhaust port provided on the top panel 5, and 8 supports both ends of the plate heater 2. This is a heater support plate.

Next, the operation of this embodiment configured as described above will be explained.

Note that the heating effect is the same as that of the conventional example shown in FIG. 3, so a description thereof will be omitted.

As in the case of the conventional example shown in FIG.
It disappears by dissipating in both directions of a.

In the above embodiment, the heater fixing plate 3a and the heater support plate 8 are fixed to the bottom plate 4, but they may be fixed to the main body case 1 or the top panel 5.

〔Effect of the invention〕

As is clear from the above description, the present invention prevents squeaks and deformation of the heater by fixing the heater in the center even if dimensional differences occur due to expansion and contraction of the plate-shaped heater, and achieves lower noise and longer life. You can get an electric heater.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an electric heater according to an embodiment of the present invention, Fig. 2 is a perspective view of the heater installation part, Fig. 3 is a cross-sectional view showing an example of a conventional electric heating SS, and Fig. 4 is a cross-sectional view of an electric heater according to an embodiment of the present invention. It is a perspective view of the heater attachment part similarly. In the figure, 1 is the main body case, 2 is the plate heater, and 3a is the agent.
Masuo Oiwa (2 others) t: Wooden pillar case 3rd rM

Claims (1)

[Claims] It has a bottom plate having an intake port, a top panel having an exhaust port, a main body case that covers the side surfaces, and a substantially rectangular plate-shaped heater disposed within the main body case, and a center portion of the plate-shaped heater. An electric heater, characterized in that the heater is fixed to the bottom plate with a heater fixing plate, and both ends are supported by heater support plates.