JPS63210552A - Structure of heat treatment chamber - Google Patents

Abstract

PURPOSE:To efficiently raise the temperature of a fluid over its entirety within a heat treatment chamber by forming at least any of the bottom surface and the wall surface including side surfaces of a heat treatment chamber by a planar heating element. CONSTITUTION:A planar heating element 1 is composed of an inside case 4, the surface of which is in contact with a liquid 3 to be treated within a liquid tank 3, an outside case 5 corresponding thereto, and a main heating element body 6 held between both cases 4 and 5. The planar heating element 1 is connected to the side wall 8 of a liquid tank 2 at flanged parts 7 extending around the peripheries of both cases 4 and 5 in considering the sealing property thereby to form the bottom surface 9 of the liquid tank 2. Both cases 4 and 5 are formed by a material having good rigidity and good thermal conductivity and also excellent in heat resistance and chemical resistance, such as stainless steel or titanium, and are connected to each other in consideration of the sealing property. When the main heating element body 6 generates heat by the power supply, its thermal energy is transmitted to the full area of the inside case 4 of the planar heating element 1, and is supplied to the entire treatment liquid 3 within the liquid tank 2 with a so-called two-dimensional surface stretch, and thus the temperature of the entire liquid 3 to be treated is efficiently raised.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heat treatment chamber structure in which heat treatment is performed by applying thermal energy to a heat treatment object housed in a heat treatment chamber such as a tank, box, or chamber.

<Prior art> When plating a metal piece by submerging it in a heated plating solution in a liquid tank, or when placing a plated object in a drying oven to dry it, the liquid in the liquid tank is Heat treatment is performed in which the object to be heat treated is heated, heated, or kept warm by applying thermal energy to the air in a drying oven.

Conventional heat treatment chamber structures for this purpose include, for example, Japanese Unexamined Patent Publication No. 61-265446 and Japanese Utility Model Publication No. 58-7.
The one described in Publication No. 277 is known.

In the former example, a rod-shaped heater is used as a thermal energy supply source, and the heat treatment chamber is formed by installing this in the liquid filled in a liquid tank, and in the latter example, a rod-shaped heater is used as a thermal energy supply source. A heat treatment chamber is formed by using a plurality of heaters and arranging them in a heating chamber provided on both sides of the heat treatment space.

<Problems to be solved by the invention> However, 1. In such a conventional heat treatment chamber structure, the liquid tank or the heating chamber itself does not emit thermal energy;
These are so-called "vessels" for the object to be heat treated,
It is necessary to place a separate thermal energy supply source there,
Moreover, since the heat treatment using the rod-shaped heater arranged therein is intended to heat the entire body by heating only a portion, the heating efficiency is correspondingly lowered, and an improvement has been desired.

The present invention has been made in view of the needs of the prior art, and it is an object of the present invention to provide a heat treatment chamber structure that can efficiently increase the temperature of the entire fluid within the heat treatment chamber.

<Means for solving the problem> For this reason, in the present invention, a planar heating element as a two-dimensional "plane" is used instead of a rod-shaped heater as a -dimensional "wire", and the bottom surface of the heat treatment chamber is (1) a heat treatment chamber structure in which at least one of the wall surfaces including the side surfaces is formed of a planar heating element; A heat treatment chamber structure is provided with an outer wall, and a heat transfer space is formed between the inner wall and the outer wall (second invention).

<For production> Next, the action will be explained.

In the first invention, since the planar heating element forming at least one of the bottom and side wall surfaces of the heat treatment chamber generates heat, the heat energy is transferred to the planar heating element, which has an expanse as a two-dimensional "surface." The entire fluid inside the heat treatment chamber is supplied from the heat treatment chamber.

In the second invention, when the planar heating element generates heat, the heat energy is effectively used not only on the inner surface of the heat treatment chamber but also on the outer surface, and the heat energy applied to the outer surface is
The fluid is transmitted as a medium in the space between the inner wall of the heat treatment chamber formed by the planar heating element and the corresponding outer wall, and is supplied to the entire fluid in the heat treatment chamber so as to surround the heat treatment chamber space. .

<Example> An example will be described below with reference to the drawings. Note that the arrows in the figure indicate the approximate transfer status of thermal energy.

1 and 2 show an embodiment of the first invention.

The sheet heating element 1 includes an inner case 4 whose surface is in contact with the processing liquid 3 in the liquid tank 2, an outer case 5 corresponding to the inner case 4, and both cases 4.
．． It consists of a heating element main body 6 held between two cases 4 and 4.
It is connected to the side wall 8 of the liquid tank 2 at a flange-like portion 7 projecting around the periphery of the liquid tank 5 in consideration of sealability, and forms a bottom surface 9 of the liquid tank 2 .

Both cases 4.5 are made of a material with good rigidity, thermal conductivity, heat resistance, and chemical resistance, such as stainless steel or titanium, and are connected to each other in consideration of sealing properties. Please note
0 is a lead wire, and 1) is a protective net designed to prevent the heat treatment target (not shown) from directly touching the inner case 4.

When the heating element main body 6 generates heat due to energization, the heat energy is transmitted to the metal surface area of the inner case 4 of the planar heating element 1, and as shown by the arrow in the figure, the liquid tank 2 spreads out in a two-dimensional "surface". The temperature of the entire processing liquid 3 is efficiently increased by being supplied to the entire processing liquid 3 inside.

FIG. 3 shows a first embodiment of the second invention. Hereinafter, parts common to the above embodiments will be designated by the same reference numerals, and redundant explanation will be omitted.

In this first embodiment, an outer wall 13 is provided corresponding to an inner wall 12 consisting of a planar heating element l forming a bottom surface 9 of a liquid tank 2 and a side wall 8, and a space between the outer case 5 and the side wall 8 and the outer wall 13 is provided. This is a heat transfer space 14. Note that 15 is heat transfer space 1
This is an escape hole for the air heated and expanded within 4.

Then, when the heating element main body 6 generates heat due to energization, the heat energy is transmitted to the metal surface area of the inner case 4 of the planar heating element 1, and is supplied to the processing liquid 3 with a two-dimensional "surface" spread, as in the previous embodiment. In addition, the heat energy transmitted from the outer case 5 is also transmitted within the heat transfer space 14 and is supplied to the processing liquid 3 through the side wall 8. Therefore, as shown by the arrow in the figure, the processing liquid 3 is completely enveloped. It raises the temperature efficiently.

FIG. 4 shows a second embodiment of the second invention.

In this second embodiment, the planar heating element 1 in the first embodiment is
forms the side surface 1 of the liquid tank 2 instead of forming the bottom surface 9 of the liquid tank 2.
6, an outer wall 13 is provided corresponding to the planar heating element 1, and a heat transfer space 14 is formed between the outer case 5 and the outer wall 13.

In addition, in the above first and second embodiments, depending on usage conditions, the inside of the heat transfer space 14 may be entirely or partially filled with a heat insulating material to form a heat insulating layer.

FIG. 5 shows a third embodiment.

The electric drying oven 17 includes an outer wall 13 having a ventilation opening 18 on the upper surface and a fan 19 facing the outer wall 13, an upper surface 21 and a lower surface 22 each having a ventilation opening 20 corresponding to the ventilation opening 18, and a planar heating element. An inner wall 1 consisting of a side surface 16 formed by the body 1
2, and a heat transfer space 14 is provided between the outer wall 13 and the inner wall 12. Further, the heat treatment object 23 is placed on a placing net 24 .

When the heating element main body 6 generates heat by being energized, the thermal energy transmitted from the metal plate area of the inner case 4 is forced down by the fan 19 and transmitted to the heat transfer space 14 through the ventilation opening 20 in the lower surface 22. On the other hand, the thermal energy transmitted from the surface metal area of the outer case 4 rises in the heat transfer space 14 due to the forced air flow of the fan 19, and descends through the ventilation opening 20 in the upper surface 21. As the above process is repeated by forced air blowing from the fan 19, the thermal energy of the planar heating element 1 is evenly and efficiently used to raise the atmospheric temperature in the electric drying oven 17. Note that the direction of the forced air flow of the fan 19 in the figure may be reversed.

<Effects> Since the heat treatment chamber structure according to the present invention has the content as explained above, it has the effect of dramatically improving the heating efficiency for the fluid in the heat treatment chamber, and the fluid in the heat treatment chamber can be liquid or gas. (first invention, second invention), and furthermore, the wall surface of the heat treatment chamber formed by the planar heating element is used as an inner wall, and an outer wall corresponding to this inner wall is provided, so that a heat transfer space is formed between the inner wall and the outer wall. For example, when a sheet heating element generates heat, the heat energy is effectively used not only on the inner side of the heat treatment chamber but also on the outside side, and the heat energy applied to the outside side is effectively used by the sheet heating element. The fluid in the space between the inner wall of the heat treatment chamber formed by There is an effect that the body's thermal energy can be used more efficiently (second invention).

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a liquid tank as a heat treatment chamber showing one embodiment of the heat treatment chamber structure according to the first invention, FIG. 2 is a partial perspective view of the liquid tank shown in FIG. 1, and FIG. A schematic sectional view of a liquid tank as a heat treatment chamber showing a first embodiment of the heat treatment chamber structure according to the second invention, FIG. 4 is a schematic sectional view equivalent to FIG. 3 showing the second embodiment of the second invention, and FIG. 5 is a schematic sectional view of an electric drying furnace as a heat treatment chamber showing a third embodiment of the second invention. 1 ... Planar heating element 9 ... Bottom surface 12- Inner wall 13 --- Outer wall 14- Heat transfer space 16- Side surface

Claims (2)

[Claims] (1) A heat treatment chamber structure in which at least one of the walls including the bottom and side surfaces of the heat treatment chamber is formed of a planar heating element. (2) A heat treatment chamber structure in which the wall surface of the heat treatment chamber formed by a planar heating element is an inner wall, an outer wall corresponding to the inner wall is provided, and a heat transfer space is formed between the inner wall and the outer wall.