JPH0471186A - Plate heater - Google Patents

Abstract

PURPOSE:To prevent local heating and achieve uniform heating process by furnishing a heat radiation plate, and therein encapsulating a heat emitting element and a specific thermo-medium in liquid state. CONSTITUTION:An electric resistance heat-emitting element 12 inside of a plate- form member 11 consists in a kanthal sheath heater and is arranged meanderingly so as to spread to the overall plate width, wherein the two ends are secured to the side end of the plate-form member 11 through a connection terminal 13. The inside of this plate-form member 11 is filled with a thermo-medium in liquid state in such a way that the heat emitting element 12 is immersed. Examples of this thermo-medium are silicone oil, organic fluoric oil, and alkyl nafthalene which are in liquid state at normal temp., to be selected according to the service temp.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plate-shaped heater suitably used as a shelf for a dryer or the like.

[Conventional technology and its technical issues]

Conventionally used dryers and atmospheric furnaces are equipped with multiple net-like shelves inside a storage container, and the objects to be processed in a dish-shaped container are placed on the shelves and the storage container is opened. It has a structure in which the entire storage container is heated by a heating element provided outside.

When conventional dryers with the above structure perform processing under reduced pressure such as vacuum drying, there is no convection inside the container and heating relies on radiant heat, resulting in poor heat conduction and uneven temperature inside the container. Therefore, there was a problem that a uniform treatment effect could not be achieved. In order to solve this problem, attempts have been made to improve heat conduction by incorporating a heater into the shelf inside the container, but as the area near the heater is locally heated, it is still not possible to obtain a uniform treatment effect. There is no problem.

[Means for solving the problem: Structure of the invention]

The present invention solves the conventional problems by using a plate heater in which a liquid heat medium is enclosed together with a heating element, thereby making it possible to achieve a uniform treatment effect.

According to the present invention, there is provided a plate heater characterized in that it is equipped with a heat sink, and a heating element and a liquid heat medium are sealed therein. Further, as preferred embodiments thereof, (a) a plate heater in which the liquid heat medium is silicone oil, organic fluorine oil, or alkylnaphthalene, and (α) a plate heater used as a shelf for a dryer are provided.

The shape of the plate heater is arbitrary, and a plate-shaped heater that can be used as a shelf or a container-shaped heater that can hold the object to be processed is used. The surface of the plate heater serves as a heat sink.

As the heating element sealed inside the plate heater, a general electric resistance heating element, a rod-shaped infrared lamp, a ceramic heating element, etc. can be widely used.

As the liquid heat medium, a heat medium that is liquid at room temperature, such as silicone oil, organic fluorine oil, or alkylnaphthalene, can be used. These may be appropriately selected depending on the operating temperature. These heat carriers can usually be used stably up to about 300°C. In addition, when using at higher temperatures, I
Low melting point metals such as Zn, Zn, and Pb can be used. However, in this case, it is necessary to electrically insulate the heat medium metal and the heating element. Silicone oil, organic fluorine oil, alkylnaphthalene, etc. are not oxidized in the air after being sealed in the plate heater, so they do not easily deteriorate and can be used for a long period of time. Incidentally, it is preferable to provide the plate heater with an airtightly sealed opening, since this makes it easier to enclose and refill the heating medium.

When the plate heater of the present invention is used as a storage shelf for a dryer, the connection terminal of the heating element mounted inside is provided protruding from the side end of the plate heater, and the connection terminal is connected to the plate support portion on the inner surface of the dryer. Providing a fitting portion for the terminal makes it easier to attach and detach the plate.

〔Example〕

FIG. 1 shows a partial cross-sectional schematic perspective view of a plate heater according to the present invention, and FIG. 2 shows a schematic perspective view of a storage container for a dryer using the plate heater as a storage shelf.

The plate heater 10 shown in FIG. 1 is formed from a plate member 11, an electric resistance heating element 12 inside the plate member, and a connecting terminal 13 of the heating element. The electric resistance heating element 12 inside the plate member 11 is a Kanthal sheath heater, and is arranged in a meandering manner so as to spread over the entire width of the plate, and both ends thereof are connected to connection terminals 13.
It is fixed to the side end of the plate member 11 via. The tip of the connection terminal 13 protrudes to the outside, and is fitted into an insert 15 provided in an external bracket 14 that supports the plate member 11. The inside of the plate member 11 is filled and sealed with silicone oil as a liquid heat medium so as to immerse the heating element 12 therein.

The storage container 20 shown in FIG. 2 is formed from a box-shaped main body 21 and the plate heater 10 mounted inside the main body 21. The second main body is provided with a door 22, and the interior is vertically partitioned into two rows, each of which is equipped with a plurality of plate heaters 10 in multiple stages. The storage container 20
A bracket for supporting the plate heater 10 is provided on the partition wall and side wall (not shown in FIG. 2).

After the object to be processed is placed on a storage shelf consisting of the plate heater 10, the door 22 is closed and the object is dried. In this case, since the plate heater 10 is detachably attached, the number of shelves can be increased or decreased depending on the objects to be processed. Furthermore, the entire heat dissipation surface of the plate heater 10 is heated, and local heating does not occur, so that uniform drying processing can be performed.

〔Effect of the invention〕

Since the plate heater of the present invention does not cause localized heating unlike conventional heaters, it is possible to achieve uniform heating treatment, and the quality of the object to be treated is significantly improved.

In addition, by providing connection terminals on the plate heater,
The plate heater can be detachably attached, and it is easy to take in and take out objects to be treated and to increase/decrease the number of shelves.

Furthermore, by using a heat medium suitable for the operating temperature, it can be used for processing in a wide temperature range.

[Brief explanation of the drawing]

FIG. 1 shows a partial cross-sectional schematic perspective view of a plate heater according to the present invention, and FIG. 2 shows a schematic perspective view of a dryer using the plate heater as a storage shelf. In the drawings 10...Plate heater, 11...Heating element. 13... Connection terminal, 20... Frame. Patent applicant Mitsubishi Metals Corporation (1 other person) Agent: Patent attorney Masahiro Matsui (1 other person)

Claims (3)

[Claims] (1) A plate heater characterized in that it is equipped with a heat sink, and a heating element and a liquid heat medium are enclosed. (2) The plate heater according to claim 1, wherein the liquid heat medium is silicone oil, organic fluorine oil, or alkylnaphthalene. (3) The plate heater according to claim 1, which is used as a shelf for a dryer.