JPH062821A - Hot air heater device and method for generating clean hot air - Google Patents

Abstract

PURPOSE:To provide a neutral flame having a low concentration of combustible gas by a method wherein fuel gas comprised of combustible gas and non-combustible gas acting as a heat carrier is heated by a quartz valve, injected into a combustion cylinder and only the combustible gas is ignited and removed. CONSTITUTION:Fuel gas comprised of combustible gas and noncombustible gas acting as heat carrier is supplied into a quartz valve 15 having a heater 16 therein, the gas is heated at a temperature higher than an igniting point of the combustible gas and then the heated fuel gas is injected from an injection hole 21 of the quartz valve 15 into a combustion cylinder 25. Air fed from an air feeding hole 30 arranged at an entire circumference of the combustion cylinder 25 is uniformly contacted with an outside part of the fuel gas injected, the combustible gas in the fuel gas is ignited and removed and at the same time the non-combustible gas is heated and its temperature is increased, resulting in that the neutral flame having no oxidization force and reducing force of low concentration of combustible gas is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-air heater device used as a heat source for glass work, for example, when a glass tube covered with a thermistor bead element is hermetically sealed. More specifically, it relates to a hot air heater device and a method for producing clean hot air, in which a flame obtained by burning a fuel gas is obtained as neutral clean hot air having no oxidizing and reducing power.

[0002]

2. Description of the Related Art As a heat source used in glasswork, fuel gas such as propane gas or hydrogen gas, which is generally filled in a gas cylinder, is ejected through an acid / hydrogen burner, and the combustible gas ejected from the crater of the burner. It is well known that oxygen is blown into the atmosphere of a characteristic gas to burn hydrogen and the obtained gas flame is used as a heat source.
It is also well known that, for example, when a glass tube covered with a thermistor bead is hermetically sealed, an infrared beam or an electric furnace is used.

[0003]

However, in the acid / hydrogen burner having the structure in which oxygen is blown into the atmosphere of the combustible gas to burn the combustible gas as described above, the oxygen is evenly distributed in the atmosphere of the combustible gas. It was impossible to supply. Therefore, oxygen concentration unevenness is generated in the frame, and for example, the central portion of the frame has a temperature higher than 700 to 1200 ° C. which is suitable for the working temperature of glass, and the glass processed material is more than necessary. Will be overheated. Therefore, a so-called devitrification phenomenon occurs in which bubbles (bubbles) are generated in the glass processed material, or the glass processed material is crystallized and becomes cloudy due to excessive supply of oxygen. Further, in the case of using an infrared beam or an electric furnace, there is a problem that it takes time to hermetically seal and the sealing becomes unstable.

As described above, the working temperature of this type of processed material generally varies depending on the type of glass, but is 700 to 1
The range of 200 ° C. is preferred. However, in the acid / hydrogen burner as described above, the temperature of the gas flame is partly raised to a temperature higher than the suitable working temperature of the glass due to the unevenness of the oxygen supplied, so that the generation of bubbles in the glass working material or the However, the devitrification phenomenon is generated and the performance is deteriorated. On the other hand, if the oxygen supply is reduced in order to lower the temperature of the gas flame below the suitable working temperature of the glass, incomplete combustion will result from insufficient oxygen supply and the gas flame will become a reducing flame, especially lead glass. There was a problem that the processed materials such as the above were blackened and deteriorated.

The present inventor solves various problems caused by excessive supply or insufficient supply of oxygen as a heat source used for working glass working materials of this type, and obtains a constantly cleaned frame. As a result of conducting various studies on the above, a forming gas composed of a combustible gas and an incombustible gas was used as the fuel gas, and the combustible gas in the fuel gas was heated to a temperature higher than its ignition point and placed in the combustion cylinder. By sending in and uniformly contacting oxygen with the outside of the fuel gas flow in the combustion cylinder, the combustible gas is burned and removed, and at the same time, a hot air that is made of only noncombustible gas and that is clean can be obtained. We have succeeded in developing a device and a method for producing clean hot air. Therefore, the present invention sufficiently heats a fuel gas composed of a combustible gas and an incombustible gas by a heat source and sends the fuel gas into a combustion cylinder, and burns and removes the combustible gas in the fuel gas in the combustion cylinder. To provide a hot air heater device and a method for producing clean hot air by raising the temperature of a non-combustible gas that becomes a carrier of heat to obtain soft and clean hot air without temperature unevenness due to only the non-combustible gas. The purpose is.

[0006]

According to the present invention, the above object is to supply a fuel gas consisting of a combustible gas and an incombustible gas from a fuel supply source into a quartz valve of a heating cylinder serving as a heat source. Then, the heating element in the quartz valve sufficiently heats the supplied fuel gas flow, injects the fuel gas flow into the combustion cylinder, burns the combustible gas to remove it, and removes the non-combustible gas. The temperature of the combustible gas in the fuel gas supplied to the quartz valve is heated by a heating element having a temperature higher than its ignition point to generate the clean hot air. By injecting the fuel gas into the combustion cylinder and evenly contacting the outside of the gas flow with oxygen, the combustible gas in the fuel gas is burned and removed, and the temperature of the noncombustible gas is raised. Flammable So that the cleaner has been hot contains no gas is obtained.

[0007]

EXAMPLE A gas cylinder indicated by reference numeral 10 is filled with fuel, and the fuel gas is supplied to a heating cylinder 13 as a heat source through a supply pipe 12 in which a flow meter 11 is incorporated. As the fuel gas, a so-called forming gas is used, which is a flammable gas such as hydrogen added with an incombustible gas that becomes a carrier of heat such as nitrogen gas, argon gas, or helium gas. The addition amount of the non-combustible gas may be appropriately selected according to the working specifications. For example, if the non-combustible gas amount is made larger than the combustible gas amount, hot air at a relatively low temperature can be easily obtained. On the contrary, if the combustible gas amount is increased in comparison with the incombustible gas amount, hot air having a relatively high temperature can be obtained.

The heating cylinder 13 is mainly composed of three elements, namely, a cylinder body 14 arranged at the outermost side, a quartz bulb 15 arranged at the center, and a heat generating body 16 arranged at the innermost side. To be done. The tubular body 14 is formed of, for example, a stainless material into a generally tubular shape. A lower end side of the cylindrical body 14 is formed in an opening 17, an upper end side thereof is closed, and a connecting pipe 18 is provided so as to integrally project upward from a central portion of the closed surface. This connecting pipe 1
Numeral 8 is detachably connected to the fuel gas supply pipe 13 through a connector to feed the fuel gas from the fuel gas source 10 into the quartz valve 15 from the vertical direction and to uniformly supply it around the heating element 16. To do.

A quartz bulb 15 having a U-shaped cross section is provided inside the cylindrical body 14 with a slight gap 19 therebetween. Due to this gap 19, a heat shield effect is realized by the air layer existing between the cylindrical body 14 and the quartz bulb 15. A stopper 20 is attached to the opening of the U-shaped quartz valve 15, and an ejection hole 21 for ejecting a fuel gas flow is opened in the U-shaped center of the quartz valve 15. The hole diameter of the ejection hole 21 is appropriately selected. Ejection hole 21
Since the side is slightly projected from the opening 17 of the cylindrical body 14, the jetted fuel gas flow is not obstructed by the opening 17 of the cylindrical body 15.

The fuel gas flow ejected from the connecting pipe 18 is ejected vertically into the quartz bulb 15.
In order to heat this fuel gas stream sufficiently, the quartz valve 1
A heating element 16 is arranged over substantially the entire area of the vertical direction 5. Therefore, the fuel gas flow surrounds the heating element 16 and uniformly heats the entire gas flow. The lead wire 22 of the heating element 16 penetrates the insulator 23, and the insulator 23 is provided above the tubular body 14 so as to face each other. Lead wires 22 are led out of the cylindrical body 14 from these insulators 23, connected to a voltage circuit 24, and a voltage is applied to the heating element 16. The heating element 20 is formed of a tungsten wire, a nichrome wire, a kanthal wire, or the like.

A combustion cylinder 25 having an inner diameter slightly larger than the outer diameter of the cylinder 14 is disposed on the opening 17 side of the cylinder 14. The combustion cylinder 21 has openings 26 at its upper and lower ends,
No. 27 is formed, and the whole has a tubular shape. Combustion cylinder 25
The opening 26 side holds the gap 28 outside the cylindrical body 14 and is held by the mounting piece 29, and the combustible gas burned from the gap 28 is released as water vapor. A large number of air introduction holes 30 are opened in the entire circumference of the combustion tube 25, and oxygen is introduced from the air introduction holes 30 by the ejection pressure of the frame 31 ejected into the combustion tube 25, and is uniformly applied to the outside of the frame 31. Therefore, the combustible gas in the fuel gas is always completely burned.

The heating temperature of the fuel gas flow by the heating element 16 is preferably a temperature above the ignition point temperature of the combustible gas. This is because if the heating is too low, the fuel gas flow ejected from the quartz valve 15 is less likely to be completely combusted in the combustion tube 25, resulting in a reducing flame. Combustion cylinder 21
Is formed in a relatively long shape so as to surround the entire frame 31 ejected from the ejection hole 17 of the quartz bulb 15,
Moreover, in that case, the air introduction hole 30 opened in the combustion cylinder 25 is also designed to be uniformly supplied to the outside of the frame 31 ejected into the combustion cylinder 25, so that the combustible gas in the fuel gas is completely combusted. To be done. The burned combustible gas becomes water vapor and is removed from the gap 28 into the atmosphere.
The incombustible gas is heated and heated to become clean hot air of only the incombustible gas and is discharged from the opening 27 of the combustion tube 25.

That is, by applying a voltage to the heating element 16,
Heat is generated so that the temperature becomes higher than the ignition point of the flammable gas in the fuel gas. Fuel gas from the fuel gas supply source 10 is supplied into the quartz bulb 15 via the supply pipe 12 and the connection pipe 18. The fuel gas flow injected into the quartz bulb 15 surrounds the heating element 16, so that the fuel gas flowing at the heating element 18 is sufficiently heated. However, since there is no oxygen in the quartz bulb 15, the flammable gas in the fuel gas is not ignited. The fuel gas flow injected into the quartz bulb 15 is sufficiently agitated in the quartz bulb 15 until it is ejected from the ejection hole 21, so that the fuel gas stream efficiently contacts the exothermic body 16 which is exothermic. Therefore, the heating of the fuel gas is performed more effectively. The sufficiently heated fuel gas flow is ejected into the combustion tube 25 through the ejection holes 21 of the quartz valve 15.

In this case, as the fuel gas, a combustible gas such as hydrogen (H ₂ ) to which a non-combustible gas such as nitrogen (N ₂ ) is added is used. Hydrogen, which is a combustible gas in the ejected fuel gas, reacts with oxygen (O ₂ ) uniformly introduced from each of the pores 30 of the combustion cylinder 25 and is burned. That is, the frame 31 has the flame
The flow of 1 itself is not disturbed, and moreover, the air is uniformly sucked from the air introduction hole 30 of the entire circumference of the combustion cylinder 25 so as to surround the frame 31, and follows the flow of the frame 31, and as a result, the air flows into the frame 31. To uniformly contact the outside of the fuel gas and burn the combustible gas in the fuel gas to generate flame seeds.

Due to this combustion, the combustible gas becomes steam (H
₂ O) and is removed, but the incombustible gas is burned in the combustion cylinder 25.
It is ejected as a frame 31 from the opening 27. Therefore, the burned combustible gas becomes water vapor and is removed from the combustion tube 25 through the gap 28. Along with this, the non-combustible gas that becomes a carrier of heat is heated and heated, and is ejected from the opening 27 of the combustion tube 25 as clean hot air. The temperature of the frame 31 becomes higher as it goes to the tip portion, and the hydrogen concentration decreases, so that the tip portion 31a of the frame 31 becomes hot and clean hot air containing only nitrogen.
The frame 31 whose tip 41 is cleaned is controlled to a temperature suitable for glass work.

Combustion cylinder 25 having the above-mentioned air introduction hole 30
Instead of the above, the combustion cylinder may be formed of a plate formed in a mesh shape with a stainless material, for example. Of course, the heating element 16 is also used in the combustion cylinder in this case as described above. Incidentally, as described above, not only the combustion flame becomes a reducing flame only with the combustion cylinder 25, but also the combustion cannot be continued when the concentration of the combustible gas is low, and when the concentration is increased, the temperature of the flame becomes higher, and the temperature becomes 1000 ° C or less. There were drawbacks such as difficulty in obtaining the frame. Therefore, by using the heating element 16 in combination, combustion continues even if the concentration of combustible gas is low, and a flame of clean non-combustible gas is ejected from the opening 27 of the combustion cylinder 25 to the outside of the combustion cylinder 25. It

Experimental Example The inventor of the present invention uses the flame-retardant gas frame 31 as described above to coat the thermistor bead element 43 with the glass coat 44.
An experiment was performed. As shown in FIG. 3, 0.15
Bead element 43 of a thermistor having a lead wire 42 of mmφ
A workpiece 46 covered with a lead glass tube 44 formed to have an outer diameter of 1.1 mm, an inner diameter of 0.8 mm and a length of 4 mm is held by a jig 46 capable of securely holding the workpiece 45, and the processing is performed. The portion to be processed, that is, the glass tube 44 is set below the tip 31a of the frame 31. In this case, it is preferable that the distance between the processed material 45 and the opening 27 of the combustion tube 25 is about 5 mm. This is because the temperature at that position is kept at 960 ° C. which is the working temperature of the glass tube. Further, the fuel gas is nitrogen gas 75-
A forming gas of 90% and hydrogen gas of 25 to 10% as a combustible gas was used.

Therefore, the heating gas is applied to the heating element 16 so that the heating element 16 is heated to a high temperature, the fuel gas is supplied from the fuel gas source 1 to the quartz valve 6 through the supply pipe 3, and is heated by the heating element 18, and then the combustion tube 25. Oxygen introduced into the combustion tube 25 through the air introduction hole 30 was uniformly contacted with the outside of the fuel gas flow, reacted, and ignited. Therefore, the cleaned frame tip 3
The processed portion of the processed material 45 was airtightly adhered by 1a. As a result, the processed material 45 was not overheated by the cleaned frame, and no foaming or devitrification was observed in the processed material. Furthermore, the 0.15 mmφ lead-in wire was hermetically sealed without fusing, and no blackening of the glass tube was observed. Furthermore, the sealed portion was heated by sequentially heating the sealed portion from the edge side of the frame, and sealing was completed.

[0019]

As described above, according to the present invention, the fuel gas supplied to the quartz bulb is heated at a temperature higher than the ignition point of the fuel by a heating element that is sufficiently heated, and the heated fuel gas stream is supplied. Is ejected from the ejection hole of the quartz valve into the combustion cylinder, and oxygen is uniformly contacted with the outside of the heated fuel gas flow to completely burn the combustible gas in the fuel gas and remove it. In addition, by heating and raising the temperature of the non-combustible gas to produce clean hot air without combustible gas, a neutral flame with no oxidizing or reducing power is obtained, and the fuel gas is a forming gas. Therefore, the temperature of the frame can be adjusted by adjusting the addition amount of the non-combustible gas that becomes a carrier of heat, and thus a heat source suitable for a processing material of small articles can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an entire hot air heater device.

FIG. 2 is a front view of a combustion cylinder.

FIG. 3 is a cross-sectional explanatory view of a main part in which a processed material is hermetically sealed by a frame cleaned by burning a fuel gas in a combustion cylinder.

[Explanation of symbols]

 10 Fuel Gas Source 13 Heat Source 14 Cylindrical Body 15 Quartz Valve 16 Heating Element 21 Jet Hole 25 Combustion Tube 30 Air Inlet Hole 31 Frame 31a Frame Tip

Claims (13)

[Claims] 1. A heat source for heating the fuel gas supplied from the fuel gas source, and a combustion cylinder for burning and removing combustible gas in the fuel gas heated by the heat source. Hot air heater device. 2. The hot air heater device according to claim 1, wherein the fuel gas comprises a combustible gas and an incombustible gas. 3. The hot air heater device according to claim 1, wherein the combustible gas is hydrogen gas and the non-combustible gas is nitrogen gas, helium gas, or argon gas. 4. The hot air heater device according to claim 1, wherein the heat source is a heating cylinder. 5. The heating cylinder has a connecting pipe at one end side for receiving fuel gas and has an opening at the other end side, and a fuel gas flow ejection hole accommodated in the cylindrical body at one end side. 2. The hot-air heater device according to claim 1, comprising a formed quartz bulb and a heating element arranged over substantially the entire length of the quartz bulb. 6. The hot-air heater device according to claim 1, wherein the combustion cylinder is formed of a cylindrical body having both ends opened and having pores all around. 7. The fuel gas supplied to the quartz valve of the heating cylinder is heated by a heating element which has been heated in advance, and the heated fuel gas flow is ejected from the ejection port of the quartz valve into the combustion cylinder. Oxygen is brought into uniform contact with the outside of the heated fuel gas stream to burn and remove the combustible gas in the fuel gas, and the temperature of the noncombustible gas is raised by heating to generate hot air with a low combustible gas concentration. A method for producing clean hot air, which is characterized in that 8. The method for producing clean hot air according to claim 7, wherein the combustible gas in the fuel gas is heated at a temperature equal to or higher than the ignition point of the gas. 9. The method for producing clean hot air according to claim 7, wherein the fuel gas comprises a combustible gas and an incombustible gas. 10. The method for producing clean hot air according to claim 7, wherein the combustible gas is hydrogen gas and the non-combustible gas is nitrogen gas, helium gas, or argon gas. 11. The method for producing clean hot air according to claim 7, wherein the heat source is a heating cylinder. 12. The heating cylinder has a cylinder having a connecting pipe for receiving fuel gas at one end and an opening at the other end, and a fuel gas flow injection hole accommodated in the cylinder and at one end. The method for producing clean hot air according to claim 7, comprising a formed quartz bulb and a heating element arranged over substantially the entire length of the quartz bulb. 13. The method for producing clean hot air according to claim 7, wherein the combustion cylinder is formed of a cylindrical body having both ends opened and having pores all around.