JPH0136012Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating device that generates far infrared rays, which can be suitably implemented in heating equipment such as an oven.

Far-infrared rays are efficient for baking foods and drying water and organic solvents, and for this reason, heating devices that generate large amounts of far-infrared rays have been desired.

An object of the present invention is to provide a heating device that can generate a large amount of far-infrared rays with a simple configuration.

The present invention has a horizontal axis, into which fuel gas and primary air for combustion are pumped, and a plurality of flame holding holes 10 and a plurality of main flame holes 9 are alternately formed in the upper part along the axis. a flame holding plate 19 arranged on both sides of each flame holding hole 10, fixed on the burner head 8, and formed higher than the length of the flame holding hole; and a flame holding plate 19 spaced above each main flame hole 9. A radiant tube 14 which is arranged at each side and extends vertically, and has a wavelength conversion layer formed on its outer peripheral surface for converting infrared rays to far infrared rays; This heating device is characterized by including a connected head 15 and a discharge fan 16 provided on the head 15.

FIG. 1 is a sectional view of a heating device equipped with a multi-flame burner according to the present invention. Primary air for combustion is forced by a fan 1 via a line 2 into a mixer 3 . On the other hand, a fuel gas such as city gas is adjusted to atmospheric pressure by a governor 4, and this adjusted gas is guided to the mixer 3 via a pipe 5 by the suction force of the primary air. The fuel gas premixed in the mixer 3 is led into the burner head 8 via a line 6 from the side wall of the burner head 8. A plurality of main flame holes 9 and flame holding holes 10 are alternately formed in the upper part of the burner head 8 along its horizontal axis.

One end of burner head 8 (right end in Figure 1)
is provided with an ignition device 12 for igniting the fuel gas ejected from the burner head 8. The ignition device 12 is, for example, an electric igniter that applies a high voltage between electrodes and releases ignition energy by spark discharge. The ignition device 12 causes the first
When the fuel gas ejected from the flame-holding hole 10 at the right end of the figure is ignited, the flame instantly transfers to the remaining main flame hole 9 and flame-holding hole 10 in sequence, and spreads over the entire length of the burner head 8. ignited. The burner head 8 is also provided with detection means 13 for detecting the presence or absence of ignition in conjunction with the ignition device 12. At the time of ignition, the governor 4 is closed in advance, and the detection means 13 detects the presence or absence of sparks from the ignition device 12. After that, the governor 4 is opened and fuel gas is supplied to the burner head 8, and the ignition operation is performed as described above. will be carried out.

In this way, a plurality of main flame holes 9 and flame holding holes 10 are arranged alternately along the axial direction of a single burner head 8, so that a single flame hole 9 and a plurality of flame holding holes 10 are arranged at the right end of the burner head 8 in FIG. The ignition device 12 and the detection means 13 can be provided, so that the configuration can be simplified and the installation space can be reduced.

A plurality (six in this embodiment) of cylindrical radiation pipes 14 corresponding to the main flame holes 9 are provided above the burner head 8 in FIG. One end of each radiation tube 14 faces each main flame hole 9, and the other end faces the header 1.
It is connected to 5. The header 15 has a discharge fan 1
6 is provided, and secondary combustion air is supplied into the radiation pipe 14 as shown by an arrow 30 by the suction force of the exhaust fan 16. As a result, sufficient air is supplied to the premixed gas ejected from the main flame hole 9, so that the flame shape of the main flame in the radiant tube 14 is formed into a long flame extending in the axial direction of the radiant tube 14. . By thus forming a long flame within the radiation tube 14, it becomes possible to heat the radiation tube 14 to a uniform temperature. Note that the combustion exhaust gas is exhausted to the outside via the header 15 by the exhaust fan 16.

2 is a plan view of the burner head 8 viewed from the direction of arrow A in FIG. 1, FIG. 3 is a sectional view taken from the cutting plane line - in FIG. FIG. The main flame hole 9 consists of a plurality of main flame outlets 17 scattered within an imaginary circle indicated by reference numeral 1 on the outer peripheral surface of the burner head 8. The hole diameter of the main flame outlet 17 of each main flame hole 9 becomes larger as the distance from the pipe 6 increases, and the number of the main flame outlet 17 is the same for all the main flame holes 9. It is composed of Therefore, the total flow rate of the fuel gas ejected from the main flame holes 9 is the same for each main flame hole 9. Therefore, the flame shape in each radiant tube 14 becomes the same, and it becomes possible to obtain a uniform temperature distribution in each radiant tube 14.

Note that the hole diameter of the main flame outlet 17 of each main flame hole 9 is the same, and the number of main flame outlets 17 is configured to gradually increase as the distance from each main flame hole 9 with respect to the pipe 6 increases. Therefore, the sum of the gas flow rates ejected from each main flame hole 9 may always be the same.

A flame holding hole 10 is arranged between each main flame hole 9. The flame stabilizing hole 10 consists of a flame stabilizing spout 18 formed in a straight line along the longitudinal direction of the burner head 8.
This flame holding hole 10 has a pair of flame holding plates 1 on both sides thereof.
9 is provided fixed to the upper part of the burner head 8. The height n of the flame holding plate 19 is selected to be greater than the length of the flame holding plate. Due to such a flame holding mechanism, even if the main flame is blown out, the main flame is instantly ignited again, and safety is maintained.

FIG. 5 is a partially cutaway sectional view of the radiation tube 14, and FIG. 6 is a sectional view taken along the cutting plane line - in FIG. The radiation tube 14 is a cylindrical heat radiation tube 20
and a wavelength conversion layer 21 applied to the outer circumferential surface of the heat dissipation tube.
including. The heat radiation tube 20 is made of stainless steel, for example. Further, the wavelength conversion layer 21 is made of inorganic ceramics such as zirconia, and when infrared rays pass through this wavelength conversion layer 21, the wavelength range is shifted, and the infrared rays are converted into far infrared rays having a longer wavelength than the wavelength of the infrared rays.

A plurality of convex portions 22 that protrude radially inward are formed on the inner circumferential surface of the heat dissipation tube 20 . Thereby, the heat absorption area of the heat radiation tube 20 can be increased, and the heat from the flame and combustion exhaust gas as a heat source is efficiently absorbed into the heat radiation tube 20. An uneven surface 23 is formed over the entire outer peripheral surface of the heat dissipation tube 20 . This uneven surface 23 allows paint such as zirconia to firmly adhere to the heat dissipation tube 20. Further, the surface of the paint, that is, the outer surface of the wavelength conversion layer 21, is formed uniformly and smoothly. This makes it possible to generate far infrared rays of the same wavelength.

The main flame ejected from the main flame hole 9 and the heat radiation pipe 20
The heat dissipation tube 20 is heated to red by the combustion exhaust gas passing through it, and infrared rays are generated from the outer surface of the heat dissipation tube 20. Furthermore, this infrared ray is converted into long wavelength far infrared rays while passing through the wavelength conversion layer 21, and this Far-infrared rays are irradiated outward from the wavelength conversion layer 21.

In this embodiment, since a plurality of radiation tubes 14 are provided, the amount of far-infrared rays is large, and a large amount of drying power and heating power can be obtained. Note that the radiation tube may be a single piece, or a curved radiation tube may be used to further increase the heat radiation area.

The heating device according to the present invention can be used in heating equipment such as ovens and other drying equipment.

As described above, according to the present invention, it is possible to generate a large amount of far infrared rays, so it can be used for baking food, water, etc.
Organic solvents, etc. can be dried efficiently. In particular, in the present invention, the burner head 8 has a horizontal axis, and along the axis, flame holding holes 10 and main flame holes 9 are formed alternately in the upper part of the burner head 8, and each flame holding hole 10 is formed alternately. Above the radiant tube 14
are arranged at intervals, so secondary combustion air is sucked in from this interval, the length of the main flame becomes longer within the radiant tube 14, and far infrared rays are efficiently radiated from the radiant tube 14. .

Further, in the present invention, since the flame stabilizing plates 19 are arranged on both sides of each flame stabilizing hole 10, the flame stabilizing function is reliably achieved. In addition, by igniting one flame holding hole 10, the flame holding hole 10 and the main flame hole 9 can be ignited simultaneously over the entire length of the burner head 8, resulting in good operability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a plan view of the burner head 8 seen from the arrow A side in Fig. 1, and Fig. 3 is a view taken from the section line - in Fig. 2. 4 is a sectional view taken from the cutting plane line - in FIG. 2, FIG. 5 is a partially cutaway sectional view of the radiation tube 14, and FIG. 6 is a sectional view taken from the cutting plane line - FIG. 8... Burner head, 9... Main flame hole, 10...
Flame holding hole, 14... Radiation tube, 20... Heat radiation tube, 21
...Wavelength conversion layer.

Claims (1)

[Claims for Utility Model Registration] It has a horizontal axis, into which fuel gas and primary air for combustion are pumped, and along the axis there are a plurality of flame holding holes 10 and a plurality of main flame holes 9 at the top. flame holding plates 19 arranged on both sides of each flame holding hole 10 and fixed on the burner head 8 and formed higher than the length of the flame holding hole; Radiant tubes 14 arranged upwardly at intervals and extending vertically, each having a wavelength conversion layer formed on its outer peripheral surface for converting infrared rays to far infrared rays, and a main flame. A heating device comprising a head 15 connected to the upper part of the hole 9 and a discharge fan 16 provided in the head 15.