JPH08296962A - Heat dryer using gas far infrared heater - Google Patents

Abstract

(57) [Abstract] [Purpose] Gas far-infrared heater is used for heating and drying. By using a far-infrared heater, heating and drying time can be shortened, and clean heating and drying without dust and dust can be performed. To aim. [Structure] A far-infrared heater using a gas as a heat source is arranged above and below, and it is a device that continuously heats and dries through a conveyor on which an object to be heated is placed, and does not exhaust combustion exhaust gas to the atmosphere as it is. The configuration is such that hot air is taken in through the heat exchanger and used as preheat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating / drying apparatus using a gas far infrared heater.

[0002]

2. Description of the Related Art Conventional far-infrared heaters using gas as a heat source include large pipe heaters and Schwank heaters.

[0003]

However, this type of heater has the following drawbacks. (A) The large-sized pipe-shaped heater is more unsuitable as a drying device than the planar one because the temperature unevenness of the object to be heated is large. (B) In the Schwank heater, combustion exhaust gas directly adheres to the object to be heated.

[0004]

The present invention was developed in order to eliminate the drawbacks of the above-mentioned conventional heating and drying means. It uses LP gas or city gas as a heat source and the combustion gas adheres to the work. To provide a heating / drying device that uses a heater having a ceramic box sprayed on the surface thereof in the form of a small box-shaped panel in which all the parts other than the intake hole and the exhaust hole are hermetically closed.

[0005]

Since the present invention uses such a far-infrared heater, the object to be heated is free from dust and dirt, and the apparatus can be miniaturized by using a small box-shaped panel heater. Further, since it is heated by far infrared rays, it is hardly affected by the ambient temperature in the furnace, and the combustion gas is forcibly exhausted so that the gas does not enter the furnace.

The far-infrared heaters are arranged vertically in parallel, and an object to be heated is placed on a conveyor and continuously transferred between them, and the exhaust heat discharged from the furnace is heat-exchanged. It is reduced into the furnace through the vessel and becomes hot air, which is preheated.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The heating and drying apparatus of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a combustion flowchart, FIG. 2 shows the heating and drying apparatus, and FIG. 3 shows a heater used in the apparatus of the present invention. . In FIG. 1, the devices from the emergency shutoff valve to the venturi are housed in the device of FIG. 2, and the gas supply from the emergency shutoff valve and the regulator are not shown in FIG.

The gas supply side branches into a high-pressure side regulator and a low-pressure side regulator via an emergency shutoff valve and a manual valve. The temperature of the heater is measured with a thermocouple and the ON / OFF control system is used with a temperature controller.
N is the high voltage side, and OFF is the low voltage side. The high-pressure side and low-pressure side regulators are branched by the number of sections controlling the heater, and the high-pressure side and the low-pressure side merge via the solenoid valve.

Then, the air enters into the venturi for all the heaters, and the air and gas are mixed and burned inside the heaters. As shown in Fig. 2, a large number of heaters are arranged in the upper and lower parts, and a few temperature controls make up one set (in the case of this figure, two
Group), accurate temperature control is possible.

Exhaust gas from the heater is collected in an exhaust duct, enters the heat exchanger on the input side of the device, radiates heat, and partly flows on a conveyor in the device to be used as preheat, and exhaust gas outside is exhaust fan. Is discharged outside the device.

Next, the apparatus will be described with reference to FIG. The figure is a cross-sectional view showing the outline of the heating and drying apparatus of the present invention,
(1) shows the arrangement of gas, and LP gas is introduced from outside the device. (2) is a far-infrared heater that radiates far-infrared rays, which are arranged in two rows above and below with a space.

Reference numeral (3) denotes an exhaust duct, which absorbs heat radiation from the heater (2). (4) is a heat exchanger, and the heat absorbed by the exhaust duct (3) is radiated and a part of the heat is agitated to operate the agitating motor (7) by being directed onto the conveyor (8) in the furnace. The heating object is preheated and a part is exhausted to the outside of the apparatus through the exhaust fan (5).

The conveyor (8) moves in the direction of the arrow within the space between the far infrared heaters (2) to heat and dry the object to be heated on the conveyor.

The far infrared heater of the present invention will be described with reference to FIG. 3, which is a perspective view of the heater (2).

In the figure, (2) is a far infrared heater using the gas of the present invention as a heat source.
Is a box-shaped case made of stainless steel (15) that is closed except for the intake hole (10) and the exhaust hole (12), and ceramics is sprayed on the surface to form a ceramic coating layer (13). And bottom insulation (14)
Then, the heat insulating material is further covered with a stainless plate (15).

The far-infrared heater (2) radiates far-infrared rays from the ceramic sprayed coating layer (13) by burning gas on the side of the intake hole (10) to heat the inside. Reference numeral (12) in the drawing indicates an exhaust hole.

[0017]

The effects of the heating / drying apparatus using the far infrared heater of the present invention are listed below. (A) Since a thermocouple can be set in the heater, the temperature can be adjusted easily, the heating temperature can be kept constant, and a homogeneous product can be manufactured. (B) In the case of heating with far infrared rays, the processing time can be shortened because heating can be performed from the inside of the object to be heated. (C) Since it can be heated and dried cleanly since it does not generate dust and dust, it can be widely used for heating and drying not only foods but also electronic parts, painted parts and other dust and dust-resistant articles. (D) Since a compact heater is combined, not only various temperature curves can be achieved by adjusting the temperature, but also the device itself can be downsized. (E) Equipped with an emergency shutoff valve, a gas leak warning device, and a misfire detection device, it enables safe operation. (F) Running costs are low because fuel with low energy cost is used. (G) Since the use of exhaust heat is taken in by a heat exchanger, energy loss is small. (H) With this far infrared heater unit (Fig. 3),
The temperature unevenness on the far-infrared radiation surface can be extremely reduced. Various effects can be obtained.

[Brief description of drawings]

FIG. 1 is a combustion flowchart of the device of the present invention.

FIG. 2 is a schematic overall view of the device of the present invention.

FIG. 3 is a perspective view of a heater (2).

[Explanation of symbols]

 (1) ... Gas piping (2) ... Far infrared heater (3) ... Exhaust duct (4) ... Heat exchanger (5) ... Forced exhaust fan (6) ... Conveyor drive motor (7) ... Stirring motor (8) ... Conveyor (10) ... Intake hole (12) ... Exhaust hole (13) ... Ceramic sprayed coating layer (14) ... Heat insulation material (15) ... Stainless steel plate

[Procedure amendment]

[Submission date] April 3, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title: Heating and drying apparatus using a gas far infrared heater

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideaki Ochiai No. 1 Central Industrial Park, Sagae City, Yamagata Prefecture, inside Tape Industry Co., Ltd. Within the corporation

Claims (2)

[Claims] 1. Far-infrared heaters using a gas as a heat source are arranged above and below, and heating and drying are continuously carried out through a conveyor on which an object to be heated is placed, and the exhaust gas at the time of heating is heat-exchanged. A heating / drying device using gas far-infrared rays, which is reduced as hot air in a furnace by passing through a vessel. 2. A small box-shaped panel case made of stainless steel in which parts other than the intake hole and the exhaust hole are hermetically sealed, and a coating layer is formed by spraying ceramics having a far infrared wavelength range on the surface of the case. The gas as a heat source, characterized in that the entire case other than the ceramic coating layer is covered with a heat insulating material, the gas is burned and heated inside the intake hole side and exhausted from the exhaust hole side. Far-infrared heater used in the heating and drying device of.