JP2003197352A - Far-infrared heater and heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a durable and small-scale far-infrared heater and a heating device using it suitably used to be immersed in liquid, radiating a large quantity of infrared rays, and allowing fine temperature control. <P>SOLUTION: This far-infrared heater H is provided with a tubular electric bulb having a tubular translucent hermetic container 1a and a coil filament 1b formed of refractory metal sealed along the tube axial direction inside the tubular translucent hermetic container 1a, a heat-resistant metal outside tube 2 having a bottomed cylinder housing the tubular electric bulb 1 inside, a far- infrared radiation material 3 attached to the outside face of the heat-resistant metal outside tube 2, and a tube end sealing mechanism 4 sealing the opened end of the heat-resistant metal outside tube 2 and supporting the tubular electric bulb 1 in the predetermined position inside the heat-resistant metal outside tube 2, and penetrated by a feeder 5. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a far infrared heater and a heating device using the same.

[0002]

2. Description of the Related Art Conventionally, when heating a liquid, a sheath heater is generally used. FIG. 8 is a conceptual diagram showing a conventional liquid heating device. In the figure, 101 is a heating tank, 102 is a sheath heater, and 103 is a liquid to be heated. That is, the sheathed heater 102 is installed in the heating tank 101, and the liquid to be heated 10 stored in the heating tank 101 is heated.
3 is heated in the immersed state.

[0003]

However, in the conventional heating device, since the sheathed heater is used as the heating element, there is a problem that the heating element is large and the amount of far infrared rays effective for heating is small. In addition, since the thermal inertia is large and it takes time to rise and fall of the temperature, it takes a long time to heat up to the required temperature, and the temperature variation range becomes large during temperature control, so that fine temperature control cannot be performed. There is also a problem.

On the other hand, a far-infrared heater is conventionally known as a heater that radiates a large amount of far-infrared rays, but it has the durability required for use by immersing it in a liquid and has a small thermal inertia. Was not found.

The present invention is a far-infrared heater which is suitable for use by being immersed in a liquid, has a small size, a large amount of infrared radiation, and is capable of fine temperature control while being durable and a far infrared heater. It is intended to provide a heating device used.

[0006]

A far-infrared heater according to a first aspect of the present invention comprises a tubular translucent airtight container and a refractory metal sealed in the tubular translucent airtight container along the axial direction thereof. A tube-shaped light bulb provided with a coil filament comprising: a heat-resistant metal outer tube having a cylindrical shape with a bottom and having a tube-shaped light bulb housed therein; and a far-infrared radiation material adhered to the outer surface of the heat-resistant metal outer tube;
A tube end sealing mechanism that seals the open end of the heat-resistant metal outer tube, supports the tubular light bulb at a predetermined position in the heat-resistant metal outer tube, and has a power supply line penetrating therethrough; I am trying.

In the present invention and the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.

First, the tubular bulb will be described. The tubular bulb includes at least a tubular translucent airtight container and a coil filament. The tubular translucent airtight container has a substantially straight tube shape, and may be made of any material such as quartz glass, glass such as hard glass, or translucent ceramics. Are generally formed. The sealing part may be a crushing sealing part using a sealing metal foil or a reduced pressure sealing part, a bead sealing part and a flare sealing part. Further, the lead member is airtightly led out from the sealing portion. The lead member is connected to the coil filament inside the tubular translucent airtight container.
Further, in the lead member, the portion led out from the sealing portion is made of a conductor such as a single wire or a stranded wire.

The coil filament is made of a refractory metal which is sealed in a tubular translucent airtight container along its tube axis. The refractory metal can be formed using tungsten, molybdenum, tantalum, or the like. The coil filament can be formed continuously or intermittently in the tube axis direction. Then, at both ends of the coil filament, a leg portion having a linear shape or a shape obtained by stretching a coil is formed, the leg portion becomes a non-light emitting portion, is connected to the sealing portion, and is further connected to the lead member via the sealing portion. Connecting. In the middle of the coil filament, a support member such as one or a plurality of dispersed ring anchors for locating the coil filament at the center of the cross section of the tubular translucent airtight container can be provided. . When the tube light bulb is lit in the vertical position, locally fix the ring anchor in the tube axis direction by locally deforming the tube translucent airtight container so that the ring anchor does not move downward. You can Further, by making the length of the pair of leg portions led out from both ends of the coil filament vertically asymmetric and lengthening the leg portion located on the upper side, the heat generating portion can be biased to the lower side as much as possible.

In addition to the above-mentioned structure, the tube-shaped light bulb includes an inert gas such as nitrogen, argon, krypton, or xenon that suppresses evaporation of the metal forming the coil filament, and a halogen for performing a halogen cycle. Alternatively, a gaseous halogen compound can be encapsulated.

As for the tube-shaped light bulb, one or a plurality of, preferably two, tubes are used for the heat-resistant metal outer tube described later. When using two tube-shaped light bulbs, it is convenient to connect them in series so that power can be easily fed through a tube end sealing mechanism described later. However, if necessary, three or more can be used in series connection or parallel connection.

Next, the heat resistant metal outer tube will be described.
The heat-resistant metal outer tube is a means for coating the outer surface with a far-infrared emitting substance described later and mechanically protecting the tube-shaped light bulb housed inside, and has a bottomed tubular shape. And store the tube light bulb inside. In the present invention, "heat-resistant metal" means that the heat-resistant metal outer tube can withstand a temperature rise when heating the atmosphere using the far-infrared heater to a desired temperature, and at the surface of the heat-resistant metal outer tube. This means that any metal can be used as long as it has a heat resistance such that the heat-resistant metal outer tube can withstand the temperature rise when the far-infrared radiation substance is deposited. As the heat-resistant metal, for example, stainless steel or Inconel alloy can be used. Further, a flange portion may be provided at the open end so as to cooperate with a pipe end sealing mechanism described later. Furthermore, if necessary, the heat-resistant metal outer tube can be filled with a gas such as nitrogen at an appropriate pressure.

The far infrared radiation substance will be described. The far-infrared ray emitting substance may be any substance as long as it emits far-infrared rays when heated, and various known substances can be used. And it is adhered to the outer surface of the heat resistant metal outer tube. To deposit the far-infrared radiation substance on the outer surface of the heat-resistant metal outer tube, various known deposition methods such as thermal spraying, coating and vapor deposition can be adopted. Further, the far-infrared radiation material can be applied to a part or substantially all of the outer surface of the heat resistant metal outer tube.

The pipe end sealing mechanism will be described. The tube end sealing mechanism is means for sealing the open end of the heat-resistant metal outer tube in a liquid-tight or air-tight manner and supporting the tube-shaped light bulb at a predetermined position in the heat-resistant metal outer tube. In addition, a power supply line penetrates the tube end sealing mechanism to supply power to the tubular bulb. Although it is preferable to seal the support of the tubular light bulb and the penetration of the power supply line in a liquid-tight or air-tight manner, the sealing may be omitted if necessary.

In order to realize the above-mentioned function, the pipe end sealing mechanism is, for example, a lid portion that closes the opening end of the heat-resistant metal outer pipe, and a flange that cooperates with the flange of the heat-resistant metal outer pipe. Section, an insulating support portion that electrically supports one end of the tubular light bulb, and a feed line insulating penetrating portion. Then, the lid portion and the flange portion can be integrally formed of metal. Further, the insulating support portion can be formed of a ceramic molded product.
Further, the feed line insulating through-hole can be configured by forming a through hole in the lid and mounting a rubber cap-like packing in the through hole.

Although not an essential component of the present invention,
By adding the following configuration, the performance as a far-infrared heater is improved or a function is added.

1 Heat-shielding means The heat-shielding means transfers the heat of the tube-shaped light bulb to the sealing portion and excessively heats the sealing portion.
This is means for preventing the life of the tubular light bulb from being shortened due to deterioration of the sealing portion. It is effective to dispose the heat shield means at the end of the tubular light bulb that is on the upper side during use, and is made of, for example, a heat-reflecting metal plate such as a stainless steel plate or an aluminum plate.
The heat shield can be locked at a desired position by utilizing the neck portion of the tubular light bulb.

2 Slide Support of Tube Light Bulb The slide support of the tube light bulb is disposed at the free end of the tube light bulb, and expands and contracts in the tube axis direction due to thermal expansion and contraction associated with blinking of the tube light bulb. On the other hand, the tube-shaped light bulb is configured to be allowed to slide with the heat-resistant metal outer tube and to protect the tube-shaped light bulb against impact or vibration applied to the heat-resistant metal outer tube from the outside. The slide support can be made of a ceramic molded product.

3 Tube-shaped Light Bulb Connection Conductor The tube-shaped light bulb connection conductor is means for connecting the other ends of the tube-shaped light bulbs to form a series connection or a parallel connection, It can be constructed using a suitable conductor such as a nickel ribbon. Further, as a connecting method, welding, brazing, caulking, or the like can be used. It should be noted that the connecting means of the tubular light bulb can be arranged in the vibration resistant slide support.

Next, the operation of the present invention will be described. That is, in the present invention, when the tube-shaped light bulb is energized via the power supply line and is turned on, heat is generated and the heat-resistant metal outer tube is heated. When the temperature of the heat-resistant metal outer tube rises, the far-infrared radiation substance adhered to the outer surface also rises in temperature and emits far-infrared rays. As a result, the atmosphere can be heated. And the following effects are produced.

1 Since the heating element is a tubular light bulb, the thermal inertia is small and the temperature rises quickly. Therefore, the rise of the temperature rise during heating becomes fast.

2. Far-infrared radiation efficiency is high, the far-infrared radiation amount is larger than that of the sheath heater, and efficient heating can be performed.

3 The heat capacity can be reduced and fine temperature control can be performed.

A heating device according to a second aspect of the present invention includes a heating device main body; and the far-infrared heater according to the first aspect provided in the heating device main body.

In the present invention, the "heating device" is a broad concept including all devices that use a far infrared heater to heat, for example, a liquid heating device, a gas heating device and a solid heating device. The liquid, gas, and solid may be any type. Further, the “heating device main body” means the remaining part of the heating device excluding the far-infrared heater.

Thus, according to the present invention, a heating device having the effects of the first aspect can be obtained.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of the present invention. FIG. 1 is a central sectional front view, FIG. 2 is an enlarged side view of a tubular bulb, and FIG. 3 shows an insulating support portion of a tube end sealing mechanism. An enlarged front view, a plan view and a bottom view, FIG. 4 is a front view, a plan view and a side view showing a slide support, FIG. 5 is a graph showing a far infrared radiation characteristic together with that of a comparative example, and FIG. 6 is a temperature. It is a graph which shows a control characteristic with that of a comparative example.

The far-infrared heater H of this embodiment includes two tube-shaped light bulbs 1 (FIG. 1 shows only the right side, and the left side is symmetrical with the right side), a heat-resistant metal outer tube 2, and far-infrared rays. It is provided with a radiant material 3, a tube end sealing mechanism 4, a pair of power supply lines 5, 5, a connecting conductor 6, a slide support 7 and a heat shield 8.

As shown in FIG. 2, the tubular light bulb 1 comprises a tubular translucent airtight container 1a and a coil filament 1b. The rated power consumption is 1 KW. The tubular translucent airtight container 1a is configured by forming crushed sealing portions 1a2, 1a3 at both ends of a quartz glass tube 1a1. In the portion of the quartz glass tube 1a1, a plurality of recessed portions 1a11 forming a pair are formed dispersed along the tube axis direction. The function of the recess 1a11 will be described later. A molybdenum sealing metal foil 1a4 is hermetically embedded in each of the sealing portions 1a2 and 1a3. Sealing part 1a
The second sealing metal foil 1a4 has a leg portion 1b2 of a coil filament 1b, which will be described later, at one end and a lead member 1c at the other end.
However, they are connected by welding. The sealing metal foil 1a4 of the sealing portion 1a3 has a leg portion 1b3 of a coil filament 1b described later at one end and a lead member 1c at the other end.
Each is connected by welding. Lead members 1c, 1
Both c are led out from the sealing portion 1a2.

The coil filament 1b is made of a tungsten wire, and has a coil portion 1b1, a pair of leg portions 1b2 and 1b.
b3 and a plurality of ring anchor portions 1b4. The coil portion 1b1 is a portion that is incandescent or red-heated during lighting of the tubular bulb to form a heating portion, and is continuously formed along the tubular axis of the tubular translucent airtight container 1. The pair of leg portions 1b2 and 1b3 are formed integrally with the coil portion 1b1 by extending the coil from both ends of the coil portion 1b1. In the figure, the upper leg portion 1b2 is longer than the left leg portion 1b3 and is supported so as to be on the upper side during lighting.
Therefore, the coil portion 1b1 is displaced downward relative to the tube axis direction of the tubular translucent airtight container 1. The plurality of ring anchor portions 1b4 are dispersed in the tube axis direction and are coiled.
Centering is performed so that the coil portion 1b1 is disposed on the b1 and is aligned with the tube axis. Further, the plurality of ring anchor portions 1b4 are restricted from moving in the tube axial direction by every other recessed portion 1a11 forming a pair of tubular translucent airtight containers along the tube axial direction. As a result, the coil unit 1
b1 is not biased downward even during vertical lighting.

The heat-resistant metal outer tube 2 is made of stainless steel, has a bottomed cylindrical shape with a diameter of 50 mm and a total length of 175 mm, and has a flange portion 2a formed on the outer periphery of the open end. The flange portion 2a has four through holes 2a at 90 ° intervals.
1 is formed, and an annular step 2a2 is formed so as to surround the opening end. A reduced diameter portion 2b is formed near the inner bottom portion of the heat resistant metal outer tube 2.

The far-infrared emitting material 3 is in the form of ceramics and is bonded to the peripheral side surface of the heat resistant metal outer tube 2 in a film shape by thermal spraying.

The pipe end sealing mechanism 4 is provided with a lid portion 4a, a flange portion 4b, an insulating support portion 4c, a feed line insulating through portion 4d, a fixing tool 4e and a C-shaped seal ring 4f. The lid portion 4a and the flange portion 4b are integrally formed of aluminum.

As shown in FIG. 1, the lid portion 4a closes the open end of the heat-resistant metal outer tube 2 and also has the concentric concave portion 4a.
a1, a pair of empty chambers 4a2, a pair of through holes 4a3, a radiation fin 4a4 and a pair of screw holes (not shown). The concentric circular recess 4a1 is concentric with the lid 4a and is formed on the inner surface side of the lid 4a. The pair of empty chambers 4a2 are formed inside the lid portion 4a so as to be continuous with the concentric recesses 4a1 and in parallel with each other, and communicate with the pair of through holes 4a3. The pair of through holes 4a3 is the lid portion 4a.
Are formed separately on the top surface of the. Vacancy 4a2 and through hole 4
A tapered surface 4a4 is formed in an annular shape at the boundary with a3. The radiating fins 4a4 are formed on the outer periphery of the lid portion 4a. The pair of screw holes are formed separately on the ceiling surface of the concentric recess 4a1.

Further, the flange portion 4b projects from the lid portion 4a to the outer peripheral side, and the flange portion 2 of the heat resistant metal outer tube 2 is provided.
Face a. Then, the four through holes 2 of the flange portion 2a
Four through holes 4b1 corresponding to a1 are formed.

As shown in FIG. 3, the insulating support portion 4c is a member for supporting the tube-shaped light bulb 1 and is made of a ceramic molded product, and is a disk-shaped portion 4c1 and a pair of cylindrical portions 4c2, 4c.
2, the groove 4c3 and the pair of mounting holes 4c4. The disk-shaped portion 4c1 is the concentric recess 4a1 of the lid 4a.
To fit. The tubular portion 4c2 fits into the vacant chamber 4a2 via a power feed line insulating penetrating portion 4d described later. Groove 4c3
Is formed on the back surface of the disk-shaped portion 4c1 and
Connect to 2. The pair of mounting holes 4c4 are formed separately from the disk-shaped portion 4c1 so as to correspond to the pair of screw holes formed separately on the ceiling surface of the concentric circular recess 4a1 of the lid 4a.

As shown in FIG. 1, the feed line insulating through portion 4d is made of a cap-like packing formed by molding a rubber insulator, and integrally includes a cap-like portion 4d1 and a bush portion 4d2. Cap-shaped part 4d1
Fits on the outside of the cylindrical portion 4c2 of the insulating support portion 4c. The bush portion 4d2 is press-fitted into the through hole 4a3 of the lid portion 4a, and the tip of the bush portion 4d2 projects outward from the lid portion 4a.

As shown in FIG. 1, the fixing member 4e comprises bolts and nuts, and the flange portion 4b of the tube end sealing mechanism 4 is provided.
A bolt is inserted into the through hole 4b1 formed in the above and the through hole 2a1 formed in the flange portion 2a of the heat resistant metal outer tube 2, and the two are fixed by tightening with a nut. Note that a washer, a spring washer, or the like can be added by conventional means.

As shown in FIG. 1, the C-shaped seal ring 4f is made of a metal ring having a C-shaped cross section. The flange portion 2a of the heat-resistant metal outer tube 2 is disposed so as to surround the annular step 2a2 of the flange portion 2a, and the flange portion 2a is fixed by the fastener 4e.
When the space between 4b is tightened, the open end of the heat resistant metal outer tube 2 is liquid-tightly sealed by the tube end sealing mechanism 4.

By inserting the pair of bolts into the pair of mounting holes 4c4 formed in the disk-shaped portion 4c1 of the insulating support portion 4c and screwing them into the pair of screw holes formed in the ceiling surface of the lid portion 4a, The insulating support portion 4c is fixed to the lid portion 4a. Further, at this time, the cylindrical portion 4a2 of the insulating support portion 4a
Is the cap-shaped portion 4d1 of the power feed line insulating through portion 4d.
Since the shoulder portion is pressed against the annular taper portion 4a5 of the lid portion 4a from the inside, a fluid-tight seal is provided between the through hole 4a3 of the lid portion 4a and the bush portion 4d2 of the feed line insulating through portion 4d. Further, the portion between the bush portion 4d2 and the power supply line 5 is a portion that passes through the through hole 4a3 of the lid portion 4a and is strongly pressed, so that a liquid-tight seal is provided.

The lower ends of the pair of power supply lines 5 and 5 are located inside the pair of cylindrical portions 4c2 of the insulating support portion 4c and are attached to the lead members 1c on the upper side of FIG.
Connected by the power supply line passing through the insulation penetration portion 4d,
Outsourced. The other ends of the power supply lines 5 and 5 are
It is connected to a 200V commercial AC power supply. Therefore, the connecting portion between the lead member 1c and the power supply line 5 is insulated from the surroundings by the tubular portion 4c2 of the insulating support portion 4c.

The connecting conductor 6 is made of a nickel ribbon,
The lower lead members 1c of the pair of tubular light bulbs in FIG. 1 are connected by welding. Therefore, the pair of tube-shaped light bulbs are connected in series, and when the pair of power supply lines 5 and 5 are connected to the power source, they are turned on in series.

The slide support 7 is, as shown in FIG.
A pair of fixing grooves 7a, 7a, which are made of a disk-shaped ceramic molded product and which receive the tips of the lower sealing portions 1a3 of the pair of tube-shaped light bulbs 1, 1 and which are orthogonal to the fixing groove 7a, and lead members 1c, A connection groove 7b for receiving the connection conductor 6 is provided. Then, by fixing the sealing portion 1a3 in the fixing groove 7a with the inorganic adhesive B, the slide support 7 is attached to the lower ends (free ends) of the pair of tube-shaped light bulbs 1 and 1, and the heat-resistant metal outer tube is attached. Reduced part 2 in 2
You will be able to slide up and down in b.

According to the embodiment of the present invention, which has been described in detail above, the far infrared radiation characteristic and the temperature control characteristic as shown by the curve A in FIGS. 5 and 6 are exhibited. Curve B is the far infrared radiation characteristic in the case of the sheathed heater shown in FIG. Further, in FIG. 5, the horizontal axis represents time and the vertical axis represents the far infrared radiation ratio. Further, in FIG. 6, the horizontal axis represents time and the vertical axis represents temperature.

Thus, as can be understood from FIG. 5, according to the present invention, the far infrared radiation efficiency is high and the temperature rises quickly.

Further, as can be understood from FIG. 6, according to the present invention, the temperature variation range of temperature control is narrow, and fine temperature control is possible.

FIG. 7 is a conceptual diagram showing an embodiment of the heating device of the present invention. In the figure, 11 is a heating tank, 12 is a liquid to be heated, and 13 is a far infrared heater.

The heating tank 11 has a liquid to be heated 12 inside.
Are housed. The far-infrared heater 13 has the same configuration as that shown in FIG. 1, and is hung so that its far-infrared radiation portion is immersed in the liquid to be heated 12.

Then, when the far infrared heater 13 is turned on, the liquid to be heated is heated by the far infrared rays emitted from the far infrared heater 13.

[0051]

According to the invention of claim 1, a tubular light bulb provided with a tubular translucent airtight container and a coil filament enclosed in the tubular translucent airtight container, and a tubular light bulb inside The bottomed cylindrical heat-resistant metal outer tube, the far-infrared radiation material adhered to the outer surface of the heat-resistant metal outer tube, and the open end of the heat-resistant metal outer tube are sealed and the bulb bulb is heat-resistant. By having a tube end seal mechanism that supports it at a predetermined position inside the metal outer tube and through which the power feed line penetrates, it is durable, yet compact, with a large infrared radiation amount, and fine temperature control. It is possible to provide a far-infrared heater made possible.

According to the invention of claim 2, the heating device main body and the far-infrared heater according to claim 1 arranged in the heating device body are provided, and thus the heating having the effect of claim 1 is provided. A device can be provided.

[Brief description of drawings]

FIG. 1 is a central sectional front view showing an embodiment of the present invention.

[FIG. 2] Similarly, an enlarged side view of the tubular bulb.

FIG. 3 is a front view, a plan view, and a bottom view of the insulating support portion of the tube end sealing mechanism, which are also enlarged.

FIG. 4 is a front view, a plan view, and a side view showing the slide support body.

FIG. 5 is a graph showing a far infrared radiation characteristic together with that of a comparative example.

FIG. 6 is a graph showing temperature control characteristics together with those of a comparative example.

FIG. 7 is a conceptual diagram showing an embodiment of a heating device of the present invention.

FIG. 8 is a conceptual diagram showing a conventional liquid heating device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tube type light bulb, 2 ... Heat resistant metal outer tube, 3 ... Far-infrared emitting material, 4 ... Tube end sealing mechanism

Claims (2)

[Claims] 1. A tubular light bulb comprising a tubular transparent airtight container and a coil filament made of a refractory metal sealed in the tubular transparent airtight container along the tube axis direction; A heat-resistant metal outer tube having a bottom and having a cylindrical shape; a far-infrared radiation substance attached to the outer surface of the heat-resistant metal outer tube;
A tube end sealing mechanism that seals the open end of the heat-resistant metal outer tube, supports the tubular light bulb at a predetermined position in the heat-resistant metal outer tube, and has a power supply line penetrating therethrough; Far infrared heater. 2. A heating device comprising: a heating device main body; and the far-infrared heater according to claim 1 disposed in the heating device main body.