JPS63160191A - Infrared radiation heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an infrared radiation heater used as a heater, a dryer, or the like.

(Prior Art) Conventionally, the following types of devices have been used. That is, as electric heaters, rod-shaped heaters such as quartz tube heaters or sheathed heaters are mainly used. Since such a heater is provided with a concave reflecting plate on the front surface to radiate heat, air inside the heater tends to stagnate and the temperature of the reflecting plate and other parts of the heater tends to rise. To prevent this, a blower is installed to forcefully blow air to lower the temperature of each part.

In addition, some plate heaters are also used, but in the case of plate heaters, a heating element made of a nichrome wire, etc. sandwiched between heat-resistant steel plates such as bonded steel plates through a heat-resistant insulating material is used, and the heat generated by the heat source is This heater transmits heat to the heat dissipating member by heat transfer through contact, with little infrared radiation and high surface temperature.

Furthermore, a ceramic sintered molded product is used as a heating element with a high heat resistance temperature for use in the above-mentioned heater.

(Problems to be Solved by the Invention) However, this prior art has the following problems. That is, in the case of a quartz tube heater or a sheathed heater, since it is rod-shaped, the surface area is small, and the surface temperature of the heater is high relative to the supplied energy. Therefore, visible light is emitted in addition to infrared rays, which poses a problem of poor efficiency. In addition, when forced air is used, energy is consumed to warm the air, resulting in a reduction in the amount of infrared radiation.

In addition, in the case of plate heaters, the bonded steel plate used as the surface material is a material with a low spectral emissivity of infrared rays, so it emits less heat by infrared rays, which is effective for heaters, etc., and the internal temperature of the heating element itself increases. Surface temperature increases. As the internal temperature rises, the nichrome wire insulated with mica etc. evaporates and becomes thinner and thinner, increasing the electrical resistance and causing the wire to break.Also, due to the high temperature, the supplied energy is used to heat the air. There was a problem that the heat radiation efficiency due to infrared rays was reduced due to consumption.

Furthermore, when ceramic sintered molded products are used as electrical insulating materials, ceramics have good electrical insulation properties, high heat resistance, and can be molded into any shape, and they also emit far infrared rays. It is preferable because it emits radiation. However, there is a problem in that the thickness must exceed a certain level due to molding, and a thin heating element cannot be manufactured.

In addition, the manufacturing process is complicated and the cost is high, and there are also problems in that it is prone to cracking and lacks durability.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and its purpose is to efficiently radiate infrared rays and prevent abnormal overheating of the heating element without forcing air. An object of the present invention is to provide an infrared radiant heater that can be easily manufactured.

(Means for Solving the Problems) In order to eliminate the above-mentioned problem 4, the present invention replaces a planar heat source with a surface material coated with a highly efficient infrared emissive ceramic paint. , a heating element is formed by being sandwiched between back materials having a light-reflecting surface, and the heating element is attached to the heater main body via a heat insulating material, and a reflecting plate is provided between the heating element and the main body, and the reflecting A convection air outlet is provided above the plate to allow air whose temperature has increased due to contact heat transfer to escape to the top, and an air inlet is provided at the bottom of the main body.

(Function) In the present invention, since the surface material that holds the heat generating source is coated with a highly efficient infrared emitting ceramic, it radiates infrared rays efficiently, and the back material has a photovolatile reflective surface. Emit less infrared rays and increase infrared usage efficiency. Furthermore, by attaching the heat generating element to the main body via a heat insulating material, heat escape from the attached part is prevented. Furthermore, by providing a reflective plate on the back surface of the heating element, infrared rays emitted from the heating element can be effectively utilized. In addition, the air taken in from the air inlet is discharged to the outside from the air outlet by natural convection to prevent abnormal overheating of the main body, wire mesh, holding fittings, etc.

(Example) The present invention will be explained below based on illustrated embodiments.

FIG. 1 shows an infrared radiation heater according to the present invention. In the figure, reference numeral 1 denotes a heater main body formed in a substantially box shape with an open front surface, and a flat heating element 2 is vertically disposed in the center of the interior of the heater main body 1. As shown in FIG. As shown in Fig. 2, this heating element 2 is constructed by winding a nichrome wire around a mica plate as a core material, and sandwiching the mica plate (B) in a sandwich shape between the mica plates as an electrical insulating material. It is equipped with a heat generation source 3. This heat generating source 3 is further held between a front surface material 4 and a back surface material 5, and the surface material 4 is fixed to the outer periphery of the back surface plate 5 by claws 4a protruding from the outer periphery thereof. The surface material 4 is a metal plate made of iron, aluminum, etc., coated with an infrared emitting ceramic paint that has high infrared radiation absorption efficiency in the entire infrared wavelength range and has an infrared spectral emissivity close to that of an ideal blackbody, at least on the surface. In the example, it is coated on both the front and back sides.

Further, as the back surface material 5, a metal plate having a light species reflecting surface, such as aluminum, is used to prevent heat dissipation due to infrared radiation from the back surface side of the heating element. In addition, back material 5
In order to prevent high-temperature oxidation corrosion in the high-temperature range, it is preferable to apply a high-temperature corrosion-resistant transparent ceramic paint to a thickness of 1 to 5 μm and perform heat-resistant treatment, or to perform general heat-resistant treatment.

As shown in FIG. 3, the heating element 2 configured in this manner is attached to the heater body 1 by screws or the like via a ceramic insulator 6 as a heat insulating material. Also,
A reflecting plate 7 having a light species reflecting surface made of aluminum or the like is provided between the heating element 2 and the main body 1.

Furthermore, an air outlet 8 formed in a cylindrical shape is provided at the upper part of the heating element 2 for discharging the convected air to the upper part. Further, an air introduction port 9 for introducing air is opened at the bottom of the heater main body 1. Thus, the air introduced from the air inlet 9 is discharged to the outside from the air outlet 8 by natural convection.

Furthermore, the front opening of the heater body 1 is covered with a grid-like wire mesh 10 to prevent accidental contact with a heating element or the like and burns.

FIG. 5 shows the electrical circuit. The nichrome wire 11 that is the heat source is connected in series to detect the fall of the heater body 1.
The overturning switch 12 turns OFF and turns OFF when abnormal temperature rise is detected.
F thermostat 13 is connected, and
A power switch] 4 with a neon lamp is connected in parallel.

In FIG. 4, reference numeral 15 indicates a leg provided at the bottom of the peak body, and the lower surface of the leg 15 has an overturning switch 1.
2 is provided, and a power switch 14 is provided on the outer surface thereof.

In the above configuration, the infrared radiation heater according to this embodiment emits infrared rays in the following manner. That is, the heating element 2 generates heat to a temperature of 300 to 500° C. by supplying power to the nichrome wire 11 as a heat generating source, thereby heating the surface material 4 . Since the surface material 4 is coated with an infrared emitting ceramic paint, the surface material 4 emits infrared rays having a spectral emissivity of 0.90 or more within the range of 2 to 20 μm.

Moreover, since the back surface material 5 having a light species reflecting surface is disposed on the back surface of the heat generating source 3, the radiated infrared rays are reflected by the back surface material 5. Further, since a reflecting plate 7 is provided on the back side of the heating element 2, the infrared rays emitted from the heating element 2 are also reflected forward by the reflecting plate 6. Furthermore, air convection occurs due to the heating of the heating element 2;
Air is introduced through the air inlet 9 provided at the bottom of the heater body 1 and is discharged upward from the exhaust port 8 provided at the top of the heating element 2, so that abnormal heating near the heating element 2 is naturally prevented. Well prevented by convection.

In this way, since infrared rays are efficiently radiated from the heating element 2, infrared radiant energy can be efficiently obtained with respect to the supplied electric power energy.

(Effects of the Invention) The present invention consists of the structure and operation described above, and can efficiently radiate infrared rays and prevent abnormal heating of the main body, wire mesh, holding metal fittings, etc. without forced ventilation. In addition, it is possible to provide an infrared radiant heater that is easy to manufacture.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of an infrared radiation heater according to the present invention, Fig. 2 is an exploded perspective view showing a heating element, Fig. 3 is a sectional view taken along line II in Fig. 1, and Fig. 4 is a IV-IV in Figure 1
The sectional view, FIG. 5, is a circuit diagram showing the electric circuit. Explanation of symbols 1 Heater body 2 Heating element 3 Heat source 4 Surface material 5 Back material
6 ・Ceramic insulator 7...reflector
8. Air outlet 9. Air inlet Patent applicant: Yoko Co., Ltd. "To Papa!" /,, *
E! ! O, A □ I,”’Ding) Agent Patent attorney
Back 1) Noriyuki -), "゛φ Fig. 1 IIl, -, TV 2 BJ w" Fig. 2 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] A heating element is constructed by sandwiching a planar heating source between a surface material coated with a highly efficient infrared emissive ceramic paint and a back material having a light-volatile reflective surface, and the heating element is connected to the heater body via a heat insulating material. At the same time, a reflector is provided between the heating element and the main body, and a convection air outlet is provided above the reflector to release air whose temperature has increased due to contact heat transfer to the top, and air is introduced into the bottom of the main body. An infrared radiation heater characterized by having a mouth.