JP2529409Y2 - Lattice far infrared heater - Google Patents

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a far-infrared heater that radiates far-infrared rays to heat an object to be heated from the inside, and particularly to a far-infrared heater using a planar far-infrared radiation plate. is there.

[Prior art]

When the object to be heated is irradiated with far infrared rays, the object to be heated is heated from the inside, and efficient heating is performed. Conventionally known far-infrared heaters that emit such far-infrared rays are roughly classified into a planar heater that does not use a reflector, and a lamp-type heater and a bar heater that use a reflector. . These heaters are used separately depending on the application. A planar far-infrared heater is a heater in which a far-infrared radiator is arranged on the front side of a heating element made of nichrome wire or the like, and a heat insulating material is arranged on the back side of the heating element. Have been. Further, the lamp-type or rod-shaped far-infrared heater has a heater element disposed at a focal position of a concave reflector, and the heater element emits far-infrared rays.

[Problems to be solved by the invention]

However, in the conventional planar heater in which the far-infrared radiator is made flat, most of the input energy is taken by the air as convective heat loss due to convection of the air in contact with the surface of the radiator. Therefore, there is a problem that the radiation efficiency is significantly reduced. According to experiments by the present inventors, it has been confirmed that when the planar heater is used in a vertical state, only about 64% of the input power can be obtained at a surface temperature of 300 ° C. as the radiant energy. Moreover, in the case of a planar heater, there is no directivity and far infrared rays
Since it is diffused by 0 degrees, there is a problem that the rate of irradiation and absorption by the object to be heated becomes small and the heating efficiency is low. Further, a heat insulating material is provided on the back side of the heating element, and heat from the heat generating element is taken away by the heat insulating material. Therefore, there is a problem that a rise time from when the switch is turned on to when heating is started is long. On the other hand, in the case of a lamp-type or rod-shaped heater using a reflection plate, the rise time is faster than that of a planar heater,
It is easy to install and replace, and has the advantage of directivity.However, since it basically functions with a reflector, if the reflector is dirty or deformed, the directivity of radiant energy will be reduced. At the same time, the radiation energy from the heater element is absorbed by the reflection plate itself, and there is a serious disadvantage that the heating efficiency of the object to be heated is significantly reduced. As a result of the energy absorption by the reflector, the reflector may generate heat, and the reflector and the heater holder may be overheated and damaged. Further, since the radiating surface area of the heater element, which is a far-infrared radiator, is relatively small, the radiator surface temperature becomes relatively high, and the amount of far-infrared radiation decreases. The present invention has been made in view of such a problem, and an object of the present invention is to obtain a far-infrared heater that has a quick start-up, has good directivity, and has high heating efficiency.

[Means for Solving the Problems]

In order to achieve this object, in the present invention, a planar far-infrared radiating plate is combined into a lattice or a large number of cylindrical bodies so as to form a lattice radiator having a large number of cylindrical portions. On the back side of the lattice-shaped radiator, a heat shield plate such as a reflector plate or a far-infrared radiation plate is arranged with a small gap. The far-infrared radiating plate is composed of two radiating plates with a far-infrared radiating layer provided on one side, with the back side without the far-infrared radiating layer on the inside, and a sheet heating element interposed between them. It is constituted by.

[Action]

With this configuration, when the planar heating element of the far-infrared radiation plate is operated, the heat radiation plates provided on both surfaces of the planar heating element are heated, and the far-infrared radiation provided on the surface of the radiation plate is heated. The emissive layer emits far-infrared rays. And since the far-infrared radiation plate is combined and formed in a lattice shape, the far-infrared radiation radiated from the heat radiation plate is reflected on the inner surface of the cylindrical portion of the lattice. In this case, since the heat shield plate is provided on the back side of the lattice radiator, the far infrared rays are suppressed from diffusing to the back side. Therefore, the far infrared rays are directed to the front of the radiator, and the object to be heated is efficiently irradiated. Further, since the far-infrared radiator is formed in a lattice shape including a large number of cylindrical portions, the air inside the radiator is suppressed from flowing out due to convection. Therefore, heat loss due to the convection of the air is reduced. As a result, most of the radiant energy of the far-infrared radiator is guided to the object to be heated, and the heating efficiency is significantly increased. Furthermore, by the fact that the far-infrared radiator is in the form of a grid,
Its emission surface area is significantly increased. Therefore, the temperature of the radiation surface becomes lower than the input power, and the wavelength region of far infrared rays emitted from the radiator shifts to the longer wavelength region.
That is, the density of far infrared rays having a long wavelength is increased. Further, since a gap is provided between the lattice radiator and the heat shield plate, heat loss due to heat conduction from the far infrared radiator to the heat shield plate is also prevented. Thus, highly efficient heating is performed, and the rise of the heater becomes extremely fast.

【Example】

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show an embodiment of a grid-shaped far-infrared heater according to the present invention, FIG. 1 is a front view showing the entire structure, FIG. 2 is a longitudinal side view thereof, and FIG. FIG. 3 is an enlarged view of the main part. 4 and 5 are a cutaway front view and an enlarged vertical sectional side view of a far-infrared radiation plate used for the heater. As is clear from FIGS. 1 and 2, this far-infrared heater 1
Is provided with a box-shaped case 2 having one open side and a far-infrared radiator 3 housed inside the case 2. The case 2 serves as a heater holder, and is supported by an appropriate support. The radiator 3 has a large number of tubular sections 4, 4,... Having a rectangular cross section open at both ends, and is formed by combining several far-infrared radiation plates 5, 5,. As shown in FIG. 3, the case 2 includes a back panel 6 and a reflection plate 7 disposed inside the back panel 6. The reflection plate 7 is made of an aluminum plate or a stainless steel plate, and its inner surface is made glossy. Thus, the heat from the radiator 3 is almost reflected by the glossy surface of the reflector 7 and is not transmitted to the back side of the heater 1. That is, the reflection plate 7 is a heat shielding plate. The lattice-like far-infrared radiator 3 is formed by an appropriate support member.
The case 2 is supported so as to form a gap. In this case, the rear end face of the radiator 3 and the reflector 7
An extremely small gap of about several tens of microns is formed between the inner surface and the inner surface. As shown in FIGS. 4 and 5, the far-infrared radiating plate 5 constituting the grid-shaped radiating body 3 is a sheet heating element 9 between two thin heat radiating plates 8, 8 made of metal or ceramic. Are sandwiched between them. The exposed surface of the heat sink 8 is coated with a far-infrared radiating material, thereby forming a far-infrared radiating layer 10. Lattice radiator 3
Is formed by bending such a flat radiation plate 5 or forming the radiation plate 5 to an appropriate length and combining them so as to form a cylindrical section 4, 4,... Having a rectangular cross section. I have. The sheet heating element 9 is a thin sheet having a heating resistance circuit 12 sandwiched between two resin films 11, 11 made of aramid resin or the like having heat resistance and electrical insulation. The circuit 12 is formed by etching or stamping a metal foil such as an iron foil. In that way, the heating resistor circuit 12 has a dense pattern,
When the circuit 12 is energized, the sheet heating element 9 generates heat from the entire surface. Its heating resistance circuit 12
Are divided into a plurality of blocks in one far-infrared radiation plate 5, and both ends thereof are projected outside as terminals 13. Then, a lead wire is connected to the terminal 13 so as to be energized from the outside. Therefore, the planar heating element 9 can be individually energized for each block. Next, the operation of the far infrared heater 1 configured as described above will be described. When the area to be heated of the object to be heated is large, all the heating resistance circuits 12, 12,.
Turn on electricity. Then, the resistor circuit 12 generates heat, and the heat heats the radiator plate 8. When the heat sink 8 is heated, the far-infrared radiation layer 10 provided on the surface of the heat sink 8
However, it emits heat rays containing a large amount of far infrared rays. Thus,
Heat rays are radiated from the entire far-infrared radiation plate 5 constituting the lattice-shaped radiator 3. When the heated area of the object to be heated is small, power is supplied only to the block of the planar heating element 9 of the far-infrared radiating plate 5 located opposite to the object to be heated. Then, heat rays are locally radiated only from the far-infrared radiation plate 5 at that portion. The heat rays radiated from the far-infrared radiation plate 5 in this manner are diffused over a range of 180 degrees because the radiation plate 5 is planar. However, since the radiating plates 5 are combined in a lattice shape, the radiating plates 5 also exist at positions facing the radiating plates 5. Therefore, the heat rays radiated toward the radiation plate 5 side facing the radiation plate 5
Is reflected by Further, the heat ray radiated toward the back side of the heater 1 is reflected by the reflector 7 provided on the back side of the grid radiator 3. As a result, these heat rays are directed toward the front of the heater 1 as indicated by arrows in FIG. As described above, the heat ray radiated from the lattice radiator 3 is directed in front of the heater 1 and irradiates the object to be heated placed in front of the heater 1. The object to be heated is heated by absorbing the heat rays. In that case, since the heat ray contains a large amount of far-infrared rays, the object to be heated is also heated from the inside by the far-infrared rays,
Efficient heating is performed. During this time, part of the energy radiated from the far-infrared radiating plate 5 is taken away by the air in contact with the radiating plate 5, but the radiating plate 5 is combined in a lattice shape to form a large number of cylindrical portions 4, Are formed, and air stays in the cylindrical portion 4, so that heat loss due to convection of the air is significantly reduced. Further, since the far-infrared radiator 3 has a lattice shape, the radiation area thereof is significantly increased. As the radiation area increases, the radiation surface temperature decreases for the same input power. When the radiation surface temperature decreases like that,
The emitted heat rays shift to longer wavelengths. That is, the heat ray radiated from the heater 1 has a high energy density of far infrared rays in a long wavelength region. As described above, according to the far-infrared heater 1, the convection heat loss is reduced and the long-wavelength far-infrared rays are directed toward the object to be heated. It is used for heating an object, and the heating efficiency becomes extremely high. In addition, by using the planar heating element 9 as described above, not only its heat resistance can be improved, but also the far-infrared radiation plate 5 can be formed thin, and its heat capacity can be reduced. Further, by providing a gap between the far-infrared radiator 3 and the reflector 7, heat conduction from the radiator 3 to the reflector 7 can also be prevented. Therefore, the heater 1 can be made to rise very quickly. In such a far-infrared heater 1, since the directivity of the heat ray is secured by the far-infrared radiator 3 itself, the reflection plate 7 basically includes the heat ray radiated from the far-infrared radiation plate 5. What is necessary is just to be able to prevent diffusion to the back side. That is, the reflector 7 may be any as long as it can block the heat rays. Therefore, there is no particular problem even if the reflector 7 is deformed.
Further, even if the reflection plate 7 is slightly contaminated, only a small part of the radiant energy is absorbed, so that the function of the heater 1 is not affected. FIG. 6 shows another embodiment of the grid-like far-infrared heater according to the present invention. In the following examples,
Since the basic configuration is the same as that of the above-described embodiment, the corresponding portions are denoted by the same reference numerals, and detailed description thereof will be omitted. In the case of the heater 21 shown in FIG. 6, a far-infrared radiation plate 22 is used as a heat shielding plate provided on the back side of the lattice-shaped far-infrared radiation body 3. The radiation plate 22 is the same as the far-infrared radiation plate 5 constituting the lattice-shaped radiator 3 except that a far-infrared radiation layer is provided only on the surface facing the lattice-shaped radiation member 3. A heat insulating material 23 is filled between the far-infrared radiation plate 22 and the back panel 6. In the far infrared heater 21 configured as described above,
The same operation and effect as the above embodiment can be obtained. Furthermore, in the case of the heater 21, since the heat rays are also radiated from the back side of the grid-shaped radiator 3, there is an effect that more efficient heating can be performed. FIG. 7 shows another embodiment of the far-infrared heater according to the present invention. In the case of the far-infrared heater 31, a large number of air outlets 33, 33,... Are formed on a reflection plate 32 provided on the back side of the lattice-like far-infrared radiator 3. Between the reflection plate 32 and the back panel 6, an air chamber 34 is hermetically sealed. Then, the rear panel 6 is placed in the air chamber 34.
Air is supplied by a blowing means 36 such as a blower through an air introduction port 35 provided in the air conditioner. In the far-infrared heater 31 configured as described above,
When air is sent from the air inlet 35 of the back panel 6 into the air chamber 34, the air is sent to the air outlets 33, 3 provided in the reflector 32.
Flows to the grid-shaped radiator 3 side through 3, ..., and its cylindrical part 4,4,
.. Flows out of the front surface of the heater 31 through. Then, while flowing through the cylindrical portion 4, it is heated by heat released from the far-infrared radiation plate 5. Therefore, the heater 31 emits hot air in addition to heat rays including far-infrared rays. Moreover, the hot air is directed forward by flowing through the cylindrical portion 4 of the grid-shaped radiator 3. as a result,
The heated object installed in front of the heater 31 is irradiated with far infrared rays and is blown with hot air,
The heating is performed more effectively. In the above embodiment, the sheet heating element 9 is
Heating resistance circuit 12 made of metal foil such as iron foil
The sheet heating element 9 is formed by bending a small-diameter sheathed heater 40 in a zigzag shape, as shown in FIG. Can also. Also in that case, the sheet heating element 9 is sandwiched between the two heat radiation plates 8, 8 made of a metal plate. Then, the far-infrared radiation layer 10 is formed by coating the surface of the heat radiation plate 8 on the exposed side with a far-infrared radiation material. In the case of the far-infrared radiation plate 5 using such a planar heating element 9, the thickness is large and heavy, but the heat resistance can be further improved as compared with the above-described embodiment. Further, in the above embodiment, the cylindrical portion 4 of the lattice-like far-infrared radiator 3 is assumed to have a rectangular cross section, but the cross section of the cylindrical portion 4 may be triangular, hexagonal, circular, or the like.
Various shapes are possible.

[Effect of the invention]

As is apparent from the above description, according to the present invention, since the far-infrared radiator is formed in a lattice shape,
Even without using a hood or the like, loss of radiation energy due to convection of air can be prevented, and directivity can be improved. Therefore, a small, inexpensive far-infrared heater with high heating efficiency can be obtained. In addition, since the function is not impaired due to dirt or deformation of the reflection plate unlike the conventional reflection type heater, a far-infrared heater having excellent durability can be obtained. In addition, the radiation area of the far-infrared radiator is increased by forming it in a grid, so that the energy density of the far-infrared radiation emitted can be increased. Thus, the heating efficiency of the far-infrared heater can be further increased. Also, by increasing the radiation area and making the far-infrared radiation plate constituting the radiator thin, the rise of the heater can be accelerated. Furthermore, since the grid-shaped radiator can be divided into a plurality of blocks and activated for each block, a far-infrared heater capable of zone control can be provided. In addition, by flowing air between the grids of the grid-shaped radiator, the heater can be a heater that uses both far infrared rays and hot air.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a grid-like far-infrared heater according to the present invention, FIG. 2 is a vertical sectional side view of the heater, FIG. 3 is an enlarged vertical sectional view of a main part of the heater, FIG. 4 is a cutaway front view of a far-infrared radiation plate used for the heater, FIG. 5 is an enlarged longitudinal side view of the radiation plate, and FIG. 6 is a different embodiment of the far-infrared heater according to the present invention. FIG. 7 is an enlarged vertical sectional view of a main part similar to FIG. 3 showing an example. FIG. 7 is a view similar to FIG. 3 showing a further different embodiment of the far-infrared heater according to the present invention. FIGS. 3A and 3B show another embodiment of a far-infrared radiation plate used for a far-infrared heater according to the present invention, wherein FIG. 2A is a front view of a main part thereof, and FIG. DESCRIPTION OF SYMBOLS 1 ... Grating-shaped far-infrared heater, 2 ... Case 3 ... Grating-shaped far-infrared radiator, 4 ... Cylindrical part 5 ... Far-infrared radiation plate, 6 ... Back panel 7 ... Reflection plate (heat shielding) 8) Heat radiation plate 9 Planar heating element 10 Far infrared radiation layer 11 Resin film 12 Heating resistor circuit 21 Grid far infrared heater 22 Far infrared radiation plate (Heat shield plate) 31 Grid-like far-infrared heater 32 Reflector plate (Heat shield plate) 33 Air outlet 36 Air blowing means 40 Seed heater (plane heating element)

Claims (6)

(57) [Scope of request for utility model registration] 1. A far-infrared radiating plate having a planar heating element sandwiched between two heat radiating plates and having a far-infrared radiating layer provided on both sides thereof is combined so as to form a lattice or a large number of cylindrical bodies. A grid-like far-infrared radiator having a large number of cylindrical portions, and a heat shielding plate disposed with a small gap on the back side of the grid-like radiator. 2. The sheet heating element according to claim 1, wherein the sheet heating element is formed in a thin plate shape in which a heating resistance circuit formed of a metal foil is sandwiched between two sheets having heat resistance and electrical insulation. The far-infrared heater according to claim 1. 3. The far-infrared heater according to claim 1, further comprising a blower for flowing air from the heat shield plate side into the cylindrical portion of the lattice radiator. 4. The planar heating element of the far-infrared radiating plate constituting the grid-shaped radiating element is divided into a plurality of blocks in an electric circuit, and each block can be individually energized. 2. The far-infrared heater according to 1. 5. The far-infrared heater according to claim 1, wherein the heat shielding plate is a reflecting plate having high heat reflectivity. 6. The far-infrared heater according to claim 1, wherein the heat shielding plate is formed by a planar far-infrared radiation plate.