JPS625007A - Forced combustion burner - Google Patents

Abstract

PURPOSE:To obtain an increased throttling ratio, a combustion part of compact construction, and improved durability, by uniting a burner and an air fan for combustion in a unitary body, and making flame port variable. CONSTITUTION:An impeller 6 supported by a support shaft 8 placed on the opposite end of a fan guide box 3 is rotated by a fan motor 4 through a shaft 5. Then, air is drawn-in in the direction of c through a supply port 1 provided on the fan guide box 3 and sent in the direction of d to be delivered from a discharge port 2. When fuel, being fed through a fuel supply pipe 10 in the direction of a, is sprayed from nozzles 9 in the direction of b toward the dis charge port 2, said fuel mixes with air in the impeller 6, so that it will, when ignited, burn at flame ports 7 secured to the outer periphery of said impeller 6 to form a primary flame A, forming further a secondary flame B with surplus air from the impeller 6. As the revolving speed of the impeller 6 increases, the volume of air increases and the peripheral velocity of said impeller increases accordingly, resulting in the formation of a wider width of flame port where fuel sprayed from the nozzle 9 will reach.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a forced combustion burner that is used as a combustion device for supplying hot water or space heating by burning fuel such as gas.

2. Description of the Related Art Conventional technology includes a burner and a combustion fan disposed upstream of the burner, and the combustion fan forces air into the burner to cause combustion.

Problems that the invention aims to solve In the conventional technology, the combustion fan and burner are separate parts, which take up a large space and become an obstacle to the interconnection of equipment, and the conventional burner has a flame opening. The combustion throttling ratio remained unchanged at about 115, and there was a key point during which it was not possible to narrow it down to an extreme degree.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention integrates a nocuna and a combustion fan, and also makes the flame port changeable.The structure of the present invention is as follows. A ventilation guide box with an open supply port and a discharge port for supplying air, a 7 unmotor fixed to one end of the ventilation guide box, and 1 motor fixed to a fan shaft extending from the fan motor and housed inside the ventilation guide box. a flame port fixed to the outer periphery of the impeller, a support shaft that supports the impeller fixed to the other end of the air guide box, and a flame hole that penetrates the support shaft and enters the inside of the impeller. It consists of a combustion supply pipe that extends and has a nozzle that opens opposite to the discharge port.

Function: With the above configuration, the fan motor rotates the impeller supported by the support shaft fixed to the other end of the air guide box via the fan shaft. As the impeller rotates, air is sucked in through the supply port opened in the air guide box and discharged through the discharge port. The fuel supplied from the fuel supply pipe is ejected from the nozzle facing the discharge port, mixes with the air inside the impeller, and burns primarily at the flame port fixed to the outer periphery of the impeller. The remaining air is used for secondary combustion. At this time, as the rotational speed of the impeller increases, the amount of air blown increases, and the peripheral speed of the impeller increases, so the width of the flame port through which fuel is supplied increases. Therefore, if the amount of fuel is increased in accordance with the amount of air blown, the width of the flame opening to which the flame adheres will also become larger, resulting in a larger aperture ratio.

Embodiment FIGS. 1 and 2 are perspective views and transverse cross-sectional views, respectively, showing a forced combustion burner according to the present invention with single-burn control. In the figure,
1 is an air supply port, and 2 is an air discharge port. 3 is a ventilation guide box in which the supply port 1 and the discharge port 2 are located at right angles;
is a fan motor provided at one end of the air guide box, 5 is a fan shaft, and 6 is an impeller. 7 is a flame port formed on the outer peripheral surface of the impeller 6; 8 is a support shaft of the fan shaft; 9
is concentric with the center of the impeller 6, and the discharge port 2 is located inside the impeller 6.
Fixed fuel supply nozzle located opposite the 1011″
The fuel supply pipe is. In addition, a is gas supply direction 1, b is gas ejection direction, C is air supply direction, d is air discharge direction,
A is a primary flame, and B is a two-seater.

In the embodiment described above, the impeller 6 supported by the support shaft 8 fixed to the other end of the air guide box 3 is rotated by the fan motor 4 via the fan shaft 5 . Impeller 6
The supply port 1 opened in the ventilation guide box 3 by rotating the
Air is sucked in in the direction of C, blown in the direction of d, and discharged from the discharge port 2. Fuel is supplied from the fuel supply pipe 10 in the direction a, and is ejected from the nozzle 9 toward the discharge port 2 in the direction b. The fuel mixes with the air inside the impeller 6, and when it is ignited, it burns as a primary flame A in the flame lower fixed to the outer periphery of the impeller 6.

The remaining air blown from the root wheel 6 forms a two-person seat B and burns at the discharge port 2. At this time, as the number of rotations of the impeller 6 increases, the amount of air blown increases, and the circumferential speed of the impeller 6 increases, so the width of the flame opening where the fuel ejected from the nozzle 9 reaches increases.

Therefore, if the amount of fuel is increased in accordance with the amount of air blown, the width of the flame opening where the loud noise adheres (the width of the secondary flame B in FIG. 2) will gradually increase, and the aperture ratio can be increased by more than twice that of the conventional flame.

Effects of the Invention As described above, the present invention has the following effects.

(1) Since the combustion fan and burner are integrated, it is possible to realize a combustion section that is much more compact than conventional ones.

(2) Since the flame opening width changes depending on the amount of air blown, a very large aperture ratio can be achieved.

(3) Since the flame nozzle is fixed to the outer periphery of the impeller, when the flame nozzle is on the air supply side, it is cooled by air and the flame nozzle temperature does not rise, improving the durability of the flame nozzle.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a forced combustion burner which is an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the same. 3...Blower guide box, 4...Fan motor, 6...Impeller, 7...Blower port, 9...
·····nozzle.

Claims (1)

[Claims] a ventilation guide box having a supply port and a discharge port for supplying air; a fan motor fixed to one end of the ventilation guide box;
An impeller fixed to a fan shaft extending from a fan motor and housed inside the air guide box, a flame port fixed to the outer periphery of the impeller, and an impeller fixed to the other end of the air guide box. A fuel supply pipe extends into the impeller through the support shaft and has a nozzle that opens opposite to the discharge port, and a flame is generated depending on the amount of air blown. A forced combustion burner that changes the width of the attached burner.