JPS60216111A - Heating apparatus of combustion type - Google Patents

Abstract

PURPOSE:To improve the concentration of heat of combustion and the heat transfer efficiency to the part intended for heating of the materials to be heated by equipping the gas emitting opening with an electrode needle and importing the specified electric field between said electrode needle and the material to be heated. CONSTITUTION:The main body of burner 3 is formed by the tubular body made of ceramics connected with the air absorbing opening 2, into which the air for combustion is absorbed. The electrode meedle 5 connected electrically to the negative electrode terminal is built-in and arranged concentrically to the main body of tubular burner at the center of the jet 3a of the upper end gas of the burner. Further, this electric needle is appended to the main body 3 of burner, made of ceramic, in the state insulating electrically the gas supply pipe 1. In the keating treatment of the metallic material tobe heated 6 by the combustion flame of Bunsen burner, the material to be heated 6 is earthed. Furthermore, the electric potential of not less than 3kV in absolute value at the negative electrode is applied to the electrode needle 5 by the D.C. power source apparatus and the potential difference is given between the electrode needle 5 and the metallic material to be heated 6.

Description

[Detailed Description of the Invention] The present invention provides a Bunsen burner, a burner for melting/brazing elbow, etc.
The present invention mainly relates to a combustion type heating device that intensively heats a local part of a metal object to be heated.

Conventionally, it has been widely known that applying an electric field to a flame has an effect on its combustion state and heat transfer state to the heated object, but in combustion heating devices such as those mentioned above, simply applying an electric field does not affect the electric field characteristics. In some cases, the heat transfer efficiency to the object to be heated may actually decrease depending on conditions such as the electric field and the electrode structure, and the technology to effectively improve the heat transfer efficiency by effectively utilizing the electric field has not yet been established. .

An object of the present invention is to effectively improve heat transfer efficiency from a burner to a local part of an object to be heated, particularly in the case of concentrated heating of a local part, by using a rational electric field application configuration based on the results of many years of research.

The characteristic configuration of the combustion type heating device according to the present invention is that an electrode needle is provided almost at the center of the gas jet port of the burner, and a DC power supply device is provided that applies a potential difference of jKV or more between the electrode needle and the metal object to be heated. , the negative electrode is provided in a state connected to the electrode needle, and its functions and effects are as follows.

To explain from the experimental results (see Figures 4 and 5), 'Figure 4 shows the gas outlet (8a) of the Bunsen burner (3).
) -/
With the OKV potential applied and the metal heated object (iron plate) (6) placed above the burner (3) grounded, the heated object (6) is heated by the combustion flame of the burner (3). Examples of heating experiments and experimental results are shown.

However, the fuel gas used: /JA (low pressure) for supplying heat: /
YθθKcal/H Air ratio: θ, 1/ In addition, the right half of the diagram and graph shows the case where no potential is applied to the electrode needle, and the left half shows the case where the potential is applied. Fill in the flame part in the diagram. The isotonic lines and numbers represent the flame velocity distribution.

The vertical axis of the graph showing the experimental results represents the amount of heat acquired by the heated object (6), that is, the amount of heat transfer (x/θ4KCa~, 5), and the horizontal axis represents the vertical center axis (P) of the electrode needle (6). ) represents the radial distance (pus) from

As a result of the above experiment, it was found that when a potential was applied to the electrode needle (5), the vertical center axis of the electrode needle (5) (
P) The flow velocity of the flame increases in the shaded area in the diagram of the circumference, and as a result, the amount of heat transfer increases when the distance from the vertical center axis (P) is between o - y o mm0 without any potential applied. It has increased more than the case.

Therefore, a potential difference (1
'? It can be seen that applying a field) is extremely effective in locally concentrated heating of the object to be heated (6).

On the other hand, FIG. 5 shows a device similar to the above experiment, with an electrode needle (5
) and the object to be heated (6) when a potential difference (electric field) is applied compared to when no potential difference is applied (%)
) is a graph showing the applied voltage (■) to the electrode needle as a parameter, and as a result it shows that the applied voltage (V) to the electrode needle (6) by the DC power supply is negative and its absolute value is JKV or more. It can be seen that the amount of heat transfer increases significantly when .

As supported by the above experimental results, by adopting the configuration of the present invention, high heat transfer efficiency that could not be achieved conventionally in local concentrated heating of the heated object, in other words, heat concentration, In addition, a combustion type heating device with extremely high thermal efficiency was created.

Next, a first embodiment will be described based on FIG.

The bar body (3) is made of a ceramic cylindrical body, and the electrode needle (3) is electrically connected to the negative electrode terminal of the DC power supply (4).
5), whose tip is the upper gas outlet (8) of the burner (3).
8) The cylindrical burner body (3) is located approximately in the center of the burner body (3).
The ceramic burner body (3) is used as an insulator and is attached to the burner body (3) in a state where it is electrically insulated from the gas supply pipe (0), thereby making it possible to utilize the electric field. It consists of a Bunsen burner.

Then, a metal heated object (iron bolt material before forging) (6
) with the combustion flame of the Bunsen burner, the object to be heated (6) is grounded, and the DC power supply (4) is connected to the electrode needle (6) with a negative pole whose absolute value is jK.
By applying a potential of V or higher and thereby creating a potential difference between the electrode needle (5) and the metal object to be heated (61),
The action of the electric field generated between both +511 (61) accelerates the movement of electrons around the circumference of the electrode needle (6) and extended axis (P) in the combustion flame toward the heated object ((1), thereby This is intended to improve the concentration of combustion heat to the heating target local part of the object to be heated (6) and the heat transfer efficiency.

Next, a second embodiment will be explained with reference to FIG.

The crater (7) forming the gas outlet (8a) in the gas fuser is made of ceramic, and the DC power supply (
The electrode needle (6) electrically connected to the negative electrode terminal of 4) is placed so that its tip is located approximately in the center of the gas outlet (8a) and is electrically insulated from the fuser body (3). When fusing the metal heated object (iron plate) (6), the heated object (6) is grounded and the electrode needle (6) is applied with a negative potential of an absolute value of jKV or more. By adding, due to the action of the electric field between both +6+ l Te3, the concentration of combustion heat to the melting target location, and
This is to increase the heat transfer efficiency and enable efficient and sharp cutting.

Next, an eighth embodiment will be explained with reference to FIG.

A piston (9) and a displacer (
10), and a low pressure gas chamber (8a) inside the cylinder (8).
) and the high-pressure gas chamber (8b) in a Stirling engine in which the cooler (I2), the heat storage section, and the heater (6) are arranged side by side in that order from the low-pressure gas chamber (8a) side. The cylindrical body of the burner (3) that heats the heater (6) with a combustion flame is made of ceramic, and the electrode needle (
5), the tip of which is the gas outlet (8a) of the burner (3)
The burner (3) main body and the fuel supply pipe f11 are provided so as to be located approximately in the center thereof, and are electrically insulated from the burner (3) main body and the fuel supply pipe f11. As in the second embodiment, by grounding the metal heater (6) and applying a negative potential with an absolute value of jKV or more to the electrode needle (5), the heater (6) This allows for effective concentrated heating.

Furthermore, to list application examples, the material of the electrode needle (5) connected to the negative electrode terminal of the DC power supply (4), and the material of the burner (
The mounting structure for 6) can be modified and improved in various ways.

The metal object to be heated (6) is connected to the electrode needle (5) as a negative electrode.
Various improvements can be made to the electrical structure of the positive electrode.

The DC current device (4) can be of various types, such as a combination of various types of batteries and a transformer, or a combination of a device that converts AC electricity from an AC power supply into DC and a transformer. can be applied.

The present invention is directed to various combustion type heating devices that intensively heat a metal object to be heated, and its use is not limited.

[Brief explanation of the drawing]

1 to 8 are diagrams showing first to eighth embodiments of the present invention, respectively. FIG. 4 is a diagram and a graph showing the experimental apparatus and the results of a reference experiment, and FIG. 5 is a graph showing the results of another reference experiment. (3)...Burner, (3a)...Gas outlet, (4)...DC power supply, (5)...
... Electrode needle, (6) ... Heated object, (■)
...Potential difference. Agent Patent Attorney Kitamura Shushu 1° Rescript 3■ □□--1 Moe 2nd Figure 5-°°[] Toki- 11 Kai 1 11 Detsuko l1pt/ Figure 4

Claims (1)

[Claims] The # hill of the gas outlet (8a) of the burner (3) is provided with an electrode needle (5) in the center, and the electrode needle (6) and the metal heated object (
6) is provided with a DC power supply device (4) that applies a potential difference (V) of jKV or more between the electrode needle (6) and its negative electrode connected to the electrode needle (6).