JPH0362963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in the burner head of a combustion device that performs combustion using liquid fuel.

BACKGROUND ART A conventional combustion apparatus of this type will be explained with reference to FIG. A mixing plate 53 formed by casting is attached to the upper opening of the vaporizing cylinder 52 into which the heater 51 is cast, and an air supply port 54 is opened in the side wall of the vaporizing cylinder 52, and an air supply nozzle 55 and an air supply pipe are installed. A fan 57 is connected via 56. Furthermore, the air supply port 5
4 has an oil supply pipe 6 connected to an oil tank 58 and a pump 59.
A refueling nozzle 61 connected through 0 is open. On the other hand, above the mixing plate 53, a flame holding plate 64 is arranged, in which a plurality of flame openings 62 are opened on the side wall and a flame holding net 63 is closely attached to the inner peripheral side wall. Mixture passage 65
A current plate 66 made of a perforated plate faces the mixing plate 5.
It is provided on the top surface of 3. In the above configuration,
When the heater 51 is energized and the vaporization tube 52 is heated to a predetermined temperature, the fan 57 and the pump 59 are activated to send combustion air and fuel into the vaporization tube 52 through the air supply port 54 . The fuel is vaporized on the heated inner wall of the vaporization tube 52 and mixed with fuel air to form an air-fuel mixture, which flows into the flame-holding plate 64 from the air-fuel mixture passage 65 via the baffle plate 66 . The air-fuel mixture that has flowed into the flame stabilizing plate 64 is rectified by the flame stabilizing net 63 and ejected from the flame port 62, and is then connected to an ignition device (not shown).
ignites and burns.

However, the conventional example described above has a drawback in that it is not possible to maintain a large TDR, that is, a ratio between strong combustion and weak combustion. In other words, if the opening area of the flame port 62, that is, the flame port load, is set in accordance with the amount of strong combustion, the flame will adhere tightly to the flame stabilizing net 63 at the time of weak combustion. It becomes red hot to the extent that it exceeds 950℃) and causes backfire. On the other hand, if the opening area of the flame port 62 is made small in accordance with the amount of weak combustion, lift or pre-ignition will occur during strong combustion. For this reason, in the past, the amount of weak combustion was reduced to 1/1.5 of the amount of strong combustion.
I could only narrow it down to ~11.8.

Problems to be Solved by the Invention The present invention attempts to solve the above-mentioned conventional problems, and aims to prevent backfire and excessive red heat of the flame stabilizing net, and also to prevent TDR, that is, the ratio of combustion amount in weak combustion to strong combustion. The purpose is to provide a large combustion device.

Means for Solving the Problems In order to achieve this problem, the present invention provides a flame stabilizing plate with a plurality of slit-shaped flame openings, and a flame stabilizing net that is press-fitted into the outer peripheral side wall of the flame stabilizing plate. The flame stabilizing net and the flame stabilizing plate are fixed by spot welding for each of the plurality of pillars formed between the flame ports, and the rectifying net is tightly attached to the inner circumferential side wall of the flame stabilizing plate. It was arranged as follows.

Effect With this configuration, even if the flame opening area is set to correspond to a weak combustion rate, the TDR can be increased because no flame lift occurs due to the flame holding effect of the flame holding net when the burn rate is low. In addition, the red heat of the flame stabilizing net that occurs during low combustion can be reduced by heat conduction from the spot welding point to the flame stabilizing plate and the close contact between the flame stabilizing plate and the flame stabilizing net, and backfire can be prevented. It can be prevented.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

1 and 2, an air supply port 3 is opened in the side wall of a carburetor cylinder 2 into which a heater 1 is cast, and is connected to a fan 6 via an air supply nozzle 4 and an air supply pipe 5. There is. Furthermore, an oil supply nozzle 10 connected to a pump 8 and an oil tank 9 via an oil supply pipe 7 is opened in the air supply port 3 . On the other hand, the upper opening of the vaporizing tube 2 is formed integrally with the mixing plate 11 by drawing a sheet metal material, and a plurality of slit-shaped flame ports 12 are provided on the side wall, the longitudinal direction of which is approximately perpendicular to the circumferential direction. A flame stabilizing plate 13 is attached which is opened so as to have the following shape. A flame stabilizing net 14 is press-fitted into the outer circumferential side wall of the flame stabilizing plate 13, and the flame stabilizing plate 13 and the flame stabilizing net 14 are connected to the pillar portion 15 formed between the flame port 12 and the flame port 12'. Each is fixed by spot welding 16 approximately in the center thereof. The flame stabilizing net 14 is composed of a wire mesh made of a heat-resistant metal material mainly composed of iron and chromium, and the wire rods of the wire mesh are arranged at an angle with respect to the circumferential direction of the flame stabilizing plate 13. The wire mesh is cut into a shape such that the ring-shaped flame stabilizing net 14 has elasticity and can be easily press-fitted into the flame stabilizing plate 13 and tightly wound. Further, a rectifying net 17 is disposed in close contact with the inner peripheral side wall of the flame stabilizing plate 13, and a rectifying plate 19 made of a perforated plate is provided inside the flame stabilizing plate 13, facing the air-fuel mixture passage 18. There is. On the other hand, an inner cap 20 and an inner cap 2 are attached to the upper open end of the flame stabilizing plate 13.
A burner cap 22 consisting of an outer cap 21 is provided above the flame stabilizing net 14 with a slight gap therebetween and covers the upper end of the flame stabilizing net 14. Further, the flame stabilizing plate 13 and the burner cap 22 are fixed by a locking screw 23 and a nut 24. In addition, the upper end of the vaporizer cylinder 2 is provided with a flame-holding net 14.
This is a heat-receiving flange 25 that covers the lower end of the flange and recovers combustion heat to the vaporization cylinder 2.

In the above configuration, when the vaporization cylinder 2 is heated to a predetermined temperature by energizing the heater 1, the fan 6 and the pump 8 are activated to send combustion air and fuel into the vaporization cylinder 2. The delivered fuel is vaporized on the heated inner wall of the vaporization cylinder 2, mixed with combustion air to form an air-fuel mixture, and flows out from the air-fuel mixture passage 18 into the flame stabilizing plate 13 via the baffle plate 19. The air-fuel mixture within the flame stabilizing plate 13 is further rectified by the rectifying net 17, ejected from the flame port 12, ignited by an ignition device (not shown), and combusted on the flame stabilizing net 14.

At this time, even if the opening area of the flame port 12 is made relatively small (the load on the flame port is large), the flame holding effect of the flame port 12 subdivided into slit-like flame ports and the flame holding net 14 are maintained.
Due to the flame-holding effect, stable combustion can be achieved without lift or misfire even at "high" combustion levels. In addition, when the combustion amount is "weak", the flame becomes small and the flame holding net 14 of the 12 parts of the flame opening is heated and becomes red-hot. Due to the strong adhesion between the flame stabilizing plate 13 and the flame stabilizing net 14 due to the spot welding 16 to the column part 15 and the heat conduction from the welding point, the red-hot temperature of the flame stabilizing net 14 is lowered by the heat resistance of the material. This makes it possible to maintain the temperature at a low temperature below the normal temperature, and the rectification effect of the rectifier net 17 is also used to prevent backfire. In addition, flame-holding net 14
Since the spot welding is performed on the pillar portion 15 close to the center of the flame outlet 12 where the red-hot temperature is most likely to rise, the red-hot temperature can be effectively lowered. Furthermore, since the flame holding plate 13 used for spot welding is integrated with the mixing plate 11 which is cooled by the air-fuel mixture, the flame holding plate 13 is kept at a relatively low temperature, and the flame holding plate 13 is moved from the spot welding point to the mixing plate 11, which is cooled by the air-fuel mixture. Heat transfer to 13 is carried out quickly and effectively, and deformation and lifting of the central red-hot portion due to the temperature difference between the upper and lower ends of the flame-holding net when the net is red-hot can be prevented. Furthermore, the burner cap 22 has two inner caps 20 and outer caps 21.
Due to the heavy structure, the air-fuel mixture is heated by flame entrainment and tends to reach high temperatures at the outer cap 2.
Since the flame is supplied to the flame opening 12 at a low temperature without touching the flame net 14, the flame stabilizing net 14 is cooled and prevented from becoming red hot, and backfire is also prevented.

Effects of the Invention As is clear from the above description, the combustion device of the present invention has a plurality of slit-shaped flame ports opened in the side wall of the flame stabilizing plate, and a flame stabilizing net is press-fitted and attached to the outer peripheral side wall of the flame stabilizing plate. In addition, a flame stabilizing net is fixed to the flame stabilizing plate by spot welding at approximately the center of each column formed between the flame ports, and an inner cap and The burner cap consists of an outer cap that is separated from the inner cap by a slight gap and closes the upper end of the flame-holding net, which ensures stable combustion due to strong flame holding during "strong" combustion and stable combustion during "weak" combustion. It becomes possible to lower the red-hot temperature of the flame-holding net, thereby increasing the ratio of the amount of combustion during "strong" combustion to the amount of combustion during "weak" combustion, that is, the TDR.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a combustion device showing an embodiment of the present invention, FIG. 2 is a perspective view showing the main parts thereof, and FIG. 3 is a longitudinal sectional view showing a conventional combustion device. 2... Vaporizing tube, 11... Mixing plate, 12... Flame port, 13... Flame holding plate, 14... Flame holding net, 15
...Column part, 16 ... Spot welding point, 17 ... Rectifier net, 22 ... Burner cap.

Claims (1)

[Claims] 1. A flame holding plate that is disposed at the upper opening of the vaporizing cylinder and is integrally formed with a mixing plate that promotes mixing of the air-fuel mixture and has a plurality of slit-shaped flame openings in the side wall, and this flame holding plate. a flame stabilizing net that is press-fitted and attached tightly to the outer peripheral side wall of the flame stabilizing plate and fixed by spot welding approximately at the center of a plurality of column parts formed between the flame ports of the flame stabilizing plate; A burner cap comprising an inner cap that closes the upper end of the flame stabilizing plate and an outer cap that is disposed with a slight gap above the inner cap and closes the upper end of the flame stabilizing net. .