JPH0320642B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an infrared burner suitable for use in drying paper, cloth, etc.

(Prior Art) The main body of a conventional long infrared burner used for drying paper, cloth, etc. is made of thick casting.

(Problems to be Solved by the Invention) However, castings have problems in that they are heavy and expensive. In addition, since cast iron has a large heat capacity, if an infrared burner is used for continuous drying of paper, cloth, etc., the paper, cloth, etc. may be burned or scorched by the radiant heat of the infrared burner after extinguishing when continuous operation is stopped. The sex was hot.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following configuration. That is, in the infrared burner according to the present invention, the burner body is formed from a thin steel plate, and a cooling air chamber is provided on the outer peripheral portion of the burner body, which is isolated from the front surface of the combustion plate.
A cooling space is provided between the burner body and the air chamber, and a through hole is provided in the cooling space to discharge air from the air chamber.

(Function) By circulating cooling air through the air passage, the outer periphery of the burner body is constantly cooled.
Even during combustion, the burner body does not reach abnormally high temperatures, and the steel plate body is less likely to be distorted. Also, after extinguishing the fire, it is quickly cooled down.

(Embodiment) FIGS. 1 to 4 show embodiments of the present invention. This infrared burner 1 has a burner main body 1a made of a thin steel plate, which has a horizontally long first mixed gas chamber 2. A combustion plate 3 made of porous ceramic material is provided in the section. At the back of the first mixed gas chamber 2, a second mixed gas chamber 5 is provided adjacent to the first mixed gas chamber 2. The second mixed gas chamber 5 has an inlet 6 provided on the back side.
The gas mixture is filled with a mixed gas of fuel gas and air sent from the air, and this mixed gas flows into the plurality of chambers provided at regular intervals on the partition wall 7 of the first mixed gas chamber 2 and the second mixed gas chamber 5. A constant amount of gas is supplied from the nozzle 8 to the first mixed gas chamber 2 . The mixed gas supplied into the first mixed gas chamber 2 passes through the pores of the combustion plate 3 to reach the plate surface, burns near the surface, and then the combustion plate 3
to become red hot. The object in front of the infrared burner 1 is heated by the radiant heat of the red-hot combustion plate 3.

The nozzle 8 is screwed onto a threaded boss 10 welded to the partition wall from the first mixed gas chamber side, and a needle valve 1 is provided at the rear end opening of the hollow portion 16.
The tip portion 14a of No. 4 is fitted. Needle valve 1
4 is screwed from the outside to a threaded boss 13 that is welded to the outer wall 12 of the second mixed gas chamber 5. In the nozzle 8, a plurality of orifices 17, 17, . The needle valve 14 can be moved back and forth by engaging a driver or the like in an engagement groove formed on the rear end surface and turning it. When the needle valve 14 moves forward, the hollow part 16 of the nozzle 8 and the tip of the needle 14 14a becomes narrower, and the amount of mixed gas supplied from the second mixed gas chamber 5 to the first mixed gas chamber 2 decreases. Conversely, when the needle valve 14 is moved backward, the gap 20 widens and the amount of mixed gas supplied increases. 22 in the figure is the needle valve fixing nut,
23 is a cap nut that serves both to protect and seal the needle valve.

Furthermore, this infrared burner 1 has a burner body 1
An air chamber 26 made of a square steel pipe 25 with a rectangular cross section is provided at the outer periphery of a. This square steel pipe 2
Guide plates 27 and 28 are attached to both the front and rear surfaces of 5 with screws 29 and 29, respectively. The front guide plate 27 is attached to the steel pipe 25 with a space therebetween by a bent peripheral edge 30a provided at the opening of the outer wall 30 of the burner body 1a and a spacer 31 fixed to the front surface of the steel pipe 25. This interval forms an air outflow path 32. Information board 27
The outer edge portion 27a is bent backward along the side surface of the steel plate 25, and a gap is formed between the outer edge portion 27a and the side surface of the steel pipe 25. Further, the inner edge portion has a plate holding portion 27b having a hook-shaped cross section at the end, and a folded portion 27c projecting rearward. The combustion plate 3 is
It is held at the front portion of the burner body 1a by the plate holding portion 27b of the guide plate 27 and a plate holding plate 33 fixed to the inner surface of the side wall 30 of the burner body 1a. Note that the space between the outer periphery of the combustion plate 3 and the side wall 30 is filled with a heat-resistant packing 34 such as asbestos.

The rear guide plate 28 extends along the rear end surface of the steel pipe 25 in close contact with the rear end surface, and the inner edge 2
8a is bent rearward on the side of the second mixed gas chamber 5. A space is formed between the guide plate 28 and the back surface of the first mixed gas chamber 2 and the side surface of the second mixed gas chamber 5, and this space is connected to the air outlet path 3.
It has become 5.

Air is supplied to the air chamber 26 from a plurality of air supply ports 36 provided at the rear. Further, in the steel pipe 25 constituting the air chamber, through holes 37, .
8,... are provided.

The cooling air sent into the air chamber 26 from the air supply port 36 flows inside the air chamber along the outer periphery of the burner body 1a, and passes through the through holes 37, . . . and the through holes 38, .
It leaks out to the outside sequentially. When the air passes through the air chamber 26, the side surface of the burner body 1a is cooled. In addition, the air flowing out from the through hole 37 cools the guide plate 27, which is at a high temperature due to heat transfer from the combustion plate 3, when passing through the outflow path 32, and the air chamber flowing out from the through hole 38 , when passing through the outflow path 35, the back surface of the burner body 1a and the side surface of the second mixed gas chamber 5 are cooled. In particular, since the front guide plate 27 is directly blown with air discharged from the through hole 37, it is effectively cooled.

In this embodiment, the second mixed gas chamber 5 is a square steel pipe 5.
20, and is provided at a position slightly apart from the first mixed gas chamber 2. The square steel pipe 50 is attached to the lower surface of the burner body 1a by a threaded boss 10. If the second mixed gas chamber is provided integrally with the burner body, there is a risk that distortion will occur at the welded parts of the steel plates that make up the two, but with the structure of this example, there is no need to worry about this. Also, due to the effect of the space 52 formed between the first mixed gas chamber 2 and the second mixed gas chamber 5, the second
The amount of heat transferred to the mixed gas chamber 5 is reduced. In addition, the second
A flow guide plate 51 having an arcuate cross section is installed between the mixed gas chamber 5 and the first mixed gas chamber 2.

The air chamber 26 is provided apart from the side surface of the burner body 1a. Therefore, a cooling space 54 is formed between the air chamber 26 and the burner body 1a, and communicates with the air outlet path 35. Therefore, the second
A cooling air flow path extending to the side of the mixed gas chamber 5 is formed. In the square steel pipe 25 constituting the cooling air chamber 26, through holes 55, 56, . The air discharged from these through holes 55, 56, ... flows out to the outside through the outlet 35a of the air outlet path 35, but at this time, the burner body 1
The side and back surfaces of the gas chamber a and the side surface of the second mixed gas chamber 5 are cooled. The fixing plates 57 fixing the rear part of the square steel pipe 25 to the burner body 1a are provided at appropriate positions at intervals, so that there is no problem with air circulation. Further, since the airflow guide plate 51 is formed in an arc shape, the curved line acts as an airflow guide surface, and air circulation is performed smoothly. Since the air discharged from the through hole 55 is blown against the front side of the burner body 1a, this portion, which becomes high in temperature, is sufficiently cooled.

Furthermore, in this embodiment, a perforated plate 60 partitions the first mixed gas chamber 2 into two front and rear chambers 2a and 2b;
An annular buttful plate 6 surrounding the nozzle 8
1 is provided. The perforated plate 60 is attached to the rear edge 33a of the holding plate 33 that holds the combustion plate 3.
It is attached to by screws 62. The baffle plate 61 is attached to the rear plate of the burner body 1a with a stopper 64. By providing the perforated plate 60 and the buffle plate 61, the mixed gas can be spread evenly over the entire surface of the combustion plate 3, and effective combustion can be performed.

In this infrared burner 1, a cooling air chamber 26 is provided on the outer periphery of the burner body 1a, and cooling air is circulated through the air chamber 26, thereby making it possible to mold the burner body from a thin steel plate. As a result, the overall weight of the burner can be reduced and it can be manufactured at low cost. In addition, since the heat capacity of the burner is reduced by using thin steel plates, cooling after extinguishing the fire can be carried out quickly.

Note that the needle valve 14 is not necessarily necessary, and instead of adjusting the supply amount of the mixed gas with the needle valve 14, the mixed gas is adjusted in advance with an external adjustment device, and then the mixed gas is sent into the second mixed gas chamber 5. It may be configured as follows.

(Effects) As is clear from the above explanation, since the infrared burner according to the present invention is made of a thin steel plate,
It is lightweight and inexpensive. Furthermore, by circulating cooling air through the air chamber 26, cooling can be promoted and thermal strain can be prevented from occurring.

In particular, in the present invention, a cooling space 54 is provided between the air chamber and the burner body, and cooling air from the air chamber is discharged into this space, so that the burner body can be cooled more effectively. Ta.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the infrared burner according to the present invention, Fig. 2 is a plan view showing its left half in cross section, Fig. 3 is its rear view, and Fig. 4 is its cross-sectional view. It is. 1... Infrared burner, 1a... Burner body, 2
...First mixed gas chamber, 3... Combustion plate, 5...
...Second mixed gas chamber, 26...Air chamber, 54...Cooling space.

Claims (1)

[Claims] 1. In an infrared burner configured to have a combustion plate on the front side of a burner body equipped with a mixed gas, and to heat a space on the front side by red-hot radiant heat from the plate, the burner body is formed of a thin steel plate. A cooling air chamber is provided on the outer periphery of the burner body and is isolated from the front surface of the combustion plate, and a cooling space is provided between the burner body and the air chamber, and the air chamber is provided in the cooling space. An infrared burner characterized by having a through hole for discharging air.