JPH0140983Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is suitable for use in heating equipment for the agriculture and stock industry, such as brooders for raising chickens, breeding equipment for piglets, and dryers for leaf tobacco or grains. The present invention relates to a prevention device.

[Prior Art] Conventionally, in many cases, this type of heater used for a long time, especially a heater using propane gas, uses a thermostat to cause combustion with a small flame. It is in a state where it is easy to cause a backfire phenomenon.

Furthermore, once a backfire occurs, there is a risk that air will be forced into the primary air intake port and combustion will continue in the gas jet nozzle 1.

[Problem to be solved by the invention] As described in the conventional technology, backfire is likely to occur in a relatively small combustion state, and especially in a small combustion state, the gas ejected from the nozzle and the air sucked from the primary air hole are When the internal pressure inside the burner caused by the mixed gas of The flame, which has an inherent tendency to retract, is drawn into the burner, ignites the gas mixture therein, and combusts explosively.

In addition, this backfire tends to sustain combustion by igniting the gas ejected from the nozzle and forcibly drawing in air from the primary air intake port, and also automatically adjusts the temperature using a thermostat. Since combustion is carried out over a long period of time, day and night, it is essential to reliably prevent backup fire, and when it occurs, to extinguish it and return to normal combustion.

The present invention was devised in view of the problems of the conventional technology as described above, and its purpose is to reliably prevent backfire against external effects such as wind, and to eliminate backfire once it has occurred. Therefore, it is an object of the present invention to provide a backup fire prevention device that prevents the continuation of the burn and at the same time allows normal combustion to occur again.

[Means for Solving the Problems] In order to achieve the above object, the prevention device of the present invention has a vertical gas mixture chamber connected to the gas jet nozzle, and a narrow pipe-shaped flame hole in the mixture chamber. A large number of disks are provided in a radial manner, and as a primary air intake, upper and lower disks are placed on top of each other with a certain gap placed around the gas jet nozzle, and a wire mesh is stretched around the outer periphery of both disks. At the same time, on the inside of this wire mesh, there is provided a gap passage bent by at least double buttfuls, and it goes without saying that the dimensions of this passage for primary air intake are configured to correspond to the amount of gas ejected. Nor.

[Function] In general, flames that tend to enter the inside of the flame hole are
First of all, the primary air is prevented as much as possible by the narrow pipe-shaped flame hole, and the airflow is directed upward into the mixing tube no matter which direction the wind pressure from the outside world comes from. This is to prevent backfire by increasing the internal pressure of the burner, and it goes without saying that the vertical direction of the gap, the width and length of the passage, the friction of the wall surface, etc. should be taken into consideration.

Furthermore, with this at least double buffle, even if a backfire occurs, the curved gap passage can more reliably control the amount of external air suction and its duration, compared to a simple mesh-like buffle. As a result, the instantaneous intake of primary air by the backup fire immediately after the explosion is not in time, and the gas combustion at the gas jet nozzle position by the backup fire is temporarily stopped, resulting in a return to the normal jetting state and the igniter, which is always in the ignition state. The combustion takes place again in the flame hole.

[Example] Examples will be described with reference to the drawings.

In Figures 1 and 2, 1 is a gas ejection nozzle, and the gas passes through the mixture chamber 3, mixes with primary air, and is ejected from the flame hole 2, where it is combusted together with the surrounding secondary air. 3a is a disk-shaped upper chamber, and a plurality of flame holes 2 are provided radially around the outer circumference of the upper chamber.

Reference numeral 4 denotes an intake port that forms the intake port for air into the mixture chamber 3, and the 60 to 70
% of the primary air is taken in, and 30 to 40% of the primary air is supplied around the flame hole 2 to achieve complete combustion.

Reference numeral 5 is a wire mesh stretched around the outer periphery of the upper disk 10 and the lower disk 11. 6 and 6' are gap passages 6a and 6 formed in a zigzag pattern with alternately protruding buttfuls.
b, which adjusts the flow of external wind pressure and directs it upward into the mixing tube, creating a situation in which backfire is less likely to occur, and, as described later, instantaneous rapid intake of air from the suction port 4 after explosive combustion due to the backfire. This serves to prevent incomplete combustion of the gas jet nozzle 1 immediately after the backup fire.

Reference numeral 7 is an igniter which is always lit or red hot, and is designed to automatically ignite when gas is ejected from the flame hole 2.

8 is a reflecting plate, and 9 is a radiating plate.

In the inventive warmer with the above configuration,
During combustion, the gap passage 6 of the buttful 6, 6'
Primary air is supplied through a and 6b, mixed with the gas from the gas jet nozzle 1 in the mixture chamber 3, and is jetted out from the flame hole 2 through the upper chamber 3a, together with the surrounding secondary air. Combustion is carried out, and at this time, as mentioned above, the pipe-shaped flame holes 2, 2... and the buttfuls 6, 6' allow the gas mixture to be ejected at a constant speed without being disturbed by some wind from the outside world. Complete combustion occurs when the combustion speed is balanced, but if a backfire occurs due to some action in the outside world and explosive combustion occurs within the mixture chamber 3, the mixture chamber 3
The air inside the baffle and the air inside the buffles 6, 6' are instantly burned out, and air cannot be temporarily supplied to the gas jet nozzle 1.

This is due to the buff-full effect, which is different from the normally used wire mesh.

Therefore, in a product without the structure of the buff-full 6, 6' like the conventional product, air can be directly supplied to the vacuum state in the mixture chamber 3 immediately after the explosion, so the gas ejection nozzle 1, continuous combustion takes place, but since the amount of air supplied is only primary air, even forced intake will cause incomplete combustion.

On the other hand, in this invention, Batsuful 6,
Since a large amount of air cannot be sucked instantaneously through 6', the gas ejection nozzle 1 is not ignited and the gas becomes a mixed gas in the mixture chamber 3 again, and when it is ejected from the flame hole 2, the igniter is activated. 7, the fuel will be ignited and combustion will occur as usual.

[Effects of the invention] As described above, according to the invention, since the flame hole is made into a thin pipe shape, inward entry of the flame is prevented as much as possible, and the inflow direction and intake amount of air by the buffs 6 and 6' are controlled. and its speed can be reliably controlled, which helps to reliably prevent backfire, as well as reliably prevent the continuation of combustion in the gas jet nozzle after backfire, and at the same time automatically return to normal combustion in the flame hole. This greatly improves the danger prevention and usability of this type of warmer, and the practical benefits are extremely significant.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional side view of the main parts of the inventive warmer, Figure 2
The figure is a perspective view of the same device. 1 - gas ejection nozzle, 2 - flame hole, 3 - air mixture chamber, 4 - suction port, 5 - wire mesh, 6, 6' - buttful,
6a, 6b~gap passage, 7~igniter, 8~reflector plate, 9~radiator plate, 10, 11~disc.

Claims (1)

[Scope of utility model registration request] A large number of pipe-shaped flame holes 2, 2 in which gas ejection nozzles 1 are arranged radially through a vertically elongated gas mixture chamber 3.
..., and an igniter 7 is disposed near the flame holes 2, 2, while an upper disk 10 and a lower disk 11 are connected to the gas jet nozzle 1 as a primary air intake. The two disks 10 and 11 are overlapped with each other with a certain gap, and a wire mesh 5 is provided on the outer peripheral edge of both the disks 10 and 11.
Further, at least double buttfuls 6, 6' are stretched alternately from the upper disk 10 and the lower disk 11 inside the wire mesh 5 to form bent gap passages 6a, 6b. A backfire prevention device for a warmer, which is characterized by: