JPH01269832A - Electric heater - Google Patents

Abstract

PURPOSE:To make it possible to output well-balanced radiation heat and convex heat, by installing comb-shaped fins on the surface of a heat slinger, shorten the length of a group of fins positioned in the lower part, extending the length of fins as they are positioned upward, and making extreme infrared radiation materials adhere to the surface. CONSTITUTION:When power is supplied to a heating element 6, the air in a ventilation passage 11 is heated to a higher temperature and is discharged indoors from an exhaust port 3 in the upper part. Accompanied by the release of this hot air, a cold air in the lower part of a room is introduced into the ventilation passage 11 between a back plate of a main body case 1 and a heat slinger 4 from an air suction port 2 and guided upward, thereby producing convection indoors and heating the indoor air. On the other hand, the convection heat discharged from each fin provided on the surface of the heat slinger 4 heats a cold air present in the lower part of the room with fins positioned in the lower part; the heated air rises and comes in contact with the next fin where it is further heated, rises and is discharged indoors from the fin 8 positioned in the upper part as convention heat. When a material (such as aluminum or zirconium) which can discharge extreme infrared radiation is adapted to adhere to the fins installed to the surface of the heat slinger 4, it can be discharged indoors as radiation heat.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a natural convection electric heater.

Conventional technology Conventionally, in a typical home, the indoor air near the window is cooled either through the window glass or by the cold air that enters through the gap between the window and the wall. It is known that heating can be done more efficiently if a convection type heater is installed as close to a window as possible. Many conventional natural convection heaters have shapes that cannot be installed in the locations mentioned above, and even those that can be installed can only heat a portion of the cold air that enters through a wide window. In either case, it was not possible to make the temperature distribution in the room uniform. In order to eliminate such drawbacks,
Electric heaters have been proposed that are rectangular parallelepiped-shaped and long in width and small in depth and height.

As shown in Japanese Utility Model Publication No. 56-27463, for example, this electric heater has a body case having an air groove inlet at the bottom and a discharge port at the top, and a surface extending in the front and rear direction inside the body case. a plurality of heating elements arranged with their axes located above and having lengths in the lateral direction; radiation fins protruding from the upper and lower sides of the heating elements along the length direction of each heating element; A fin support located approximately in the center in the horizontal direction and provided between the radiating fins to maintain the distance between the radiating fins, and a fin support located above the fin support and provided in the upper part of the body case to prevent excessive temperature rise. It is configured with a container.

Problems to be Solved by the Invention However, with the above configuration, it is extremely difficult to generate a large amount of convective heat, and there is a problem that heating cannot be performed efficiently.

The present invention solves these conventional problems and aims to provide an electric heater that efficiently heats the room.

Means for Solving the Problems In order to solve the above problems, the electric heater of the present invention uses a heat sink that is devised to emit radiant heat and convection heat in a well-balanced manner. In other words, the surface of the heat sink has comb-shaped fins, the lower part of the fin group is short, and the fins are gradually longer toward the top, and a far-infrared radiating material is attached to the surface. That is.

Function The present invention has the effect of promoting air convection from the lower part to release more convective heat and emitting far-infrared radiation.

Example Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is the main body case, which has a frame plate 9 that is long horizontally and has a U-shaped vertical section with a small depth and height, and has an intake hole 2 in the lower part of this frame plate 9 and exhaust air in the upper part. It has a hole 3.

Inside the main body case 1, a laterally long heat sink plate 4 (made of aluminum material, aluminum alloy material 9, etc.) is supported vertically by support fittings 5 and at a constant distance from the main body case 1.

The left and right ends of each of the heat dissipation plate 4 and the frame plate 9 are provided with side plates 10.
, 10. The back surface of the heat sink 4 is smooth, and a plurality of heat generating elements (tape strip resistors having a positive temperature coefficient) 6 are arranged on the top and bottom of the back surface along the length direction of the heat sink 4. is fixed with adhesive or adhesive film.

In addition, a plurality of fins are provided on the surface of the heat dissipator 4 in a horizontally long and comb-like shape, and the lower fins 7
The protrusion length of each fin group is increased in sequence as it goes upward, such that the protrusion length of the fins 8 is small, and the protrusion length of the upper fin 8 is increased. However, even the one with the largest protrusion length does not protrude beyond the front edge of the side plate 10. Furthermore, the shape of each fin is such that the wall thickness becomes thinner toward the tip. In the embodiment, the upper surface of the fin is made smooth, and only the lower surface is tapered, and the thickness becomes thinner toward the tip, but there is no problem even if both the upper and lower surfaces are tapered.

In the above configuration, when the heating element 6 is energized, the air in the ventilation passage 11 is heated and rises, and is discharged into the room from the exhaust hole 3 in the upper part. As this hot air is released, cold air from the lower part of the room is introduced through the intake holes 2 into the ventilation passage 11 between the back plate of the main body case 1 and the heat sink 4, and is guided upward, so that convection occurs inside the room. , can warm indoor air.

On the other hand, the convective heat released from each fin on the surface of the heat dissipation plate 4 warms the cold air in the lower part of the room by the lower fins 7, rises, hits the next fin, is further warmed there and rises, and then As it hits the upper fins, it is heated one after another and is released into the room as convection heat from the 8 upper fins. Note that an overtemperature rise preventer 12 is attached to the top of the heat sink 4.

Furthermore, if a material that emits far infrared rays well (alumina, silcony 1, etc.) is attached to the fins on the surface of the heat sink 4, radiant heat will be released into the room.

Effects of the Invention As is clear from the description of the embodiments above, the electric heater of the present invention provides the following effects.

(1) Since the heat sink and the heating element are integrated and the heat sink forms the front part of the vessel, there is an effect that convective heat and radiant heat can be efficiently released.

ri) Since a material that emits far-infrared rays is attached to the surface of the heat sink, far-infrared radiant heat is efficiently radiated, resulting in efficient heating.

(3) A plurality of comb-shaped fins are provided on the surface of the heat sink,
The projecting length of the fins is gradually increased from the bottom to the top, and the thickness of the fins becomes thinner toward the tip, so the cold air from the bottom is first warmed by the fins below and rises. It is heated by the upper fins and released into the room as convection heat from the top fin,
It also functions to draw out convection heat coming out from the ventilation duct,
It efficiently releases convective heat and provides comfortable electric heating.

[Brief explanation of the drawing]

FIG. 1 is a front view of an electric heater according to an embodiment of the present invention. FIG. 2 is a side view of the electric heater with the frame plate removed. FIG. 3 is a rear perspective view of the heat sink of the electric heater. 1...Body case, 2...Intake hole, 3
...Exhaust hole, 4... Heat sink, 6...
...Heating element, 7...Fin, 8...
Fin, 9... Frame plate, 11... Ventilation duct. Name of agent: Patent attorney Toshio Nakao and one other person
Main body case 2 - warm air vent Figure 1 Figure 2 Figure 7 ?

Claims (3)

[Claims] (1) Exhaust holes and intake holes are provided on the upper and lower front surfaces of the main body case over almost the entire width thereof, and a heat sink is arranged vertically inside the main body case so as to form a ventilation path on the back thereof, and the heat dissipation A heating element is attached to the back side of the plate, and a plurality of fins are provided on the front side of the heat dissipation plate in a comb-like shape upward and downward. An electric heater characterized in that the wall thickness is made larger and thinner toward the tip, and furthermore, a far-infrared radiating material is attached to the surface. (2) The electric heater according to claim 1, wherein the heating element is formed into a tape shape by a resistor having a positive temperature coefficient and an insulating film. (3) The electric heater according to claim 1, wherein the heat sink is made of a metal material with good thermal conductivity.