JPS61265409A - Combustion device - Google Patents

Abstract

PURPOSE:To prevent and reduce production of backfire, lift, and NOx, by a method wherein a slit, the area of which is widely changed with the aid of a motor, is formed in the lower part of the burner port of a burner used for domestic stove. CONSTITUTION:Gas, injected through a burner port 1 of a burner body 2 after passage through a slit 3 in a rotary cylinder 4 by means of a fuel pipe 8, is ignited for combustion. The slit 3 is narrowed through rotation of a motor 6, injection of the gas through the burner port 1 is decreased, flame is moved from the burner port 1 to the slit 3, and variation of the burner port causes easy control of a combustion amount. The burner body 2 and the rotary cylinder 4 are made of ceramic, and variability of the slit hole may be controlled by a slide needle type instead of rotation type.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion device for household combustion equipment that has a large throttle ratio for the amount of combustion and has low NO emissions.

Conventional technology In conventional combustion devices, the combustion amount is limited to a limit of 9% in the fully premixed combustion system by installing an air-fuel ratio control device such as a zero governor, and in the Bunsen combustion system, the combustion amount is limited to 9% was the limit. Although it was possible to obtain a large throttle ratio by changing the number of burners and combining the combustion method described above, the structure was complicated. Furthermore, although the fully premixed combustion system has the lowest NOx, it has the disadvantage of not being able to achieve a throttle ratio, and there is no combustion system that has a large throttle ratio for the amount of combustion and has low NOx.

The problem that the invention seeks to solve.

All of the above systems have the problem that the flame hole structure of the burner does not change with respect to changes in the combustion amount, the appropriate combustion range is determined by the combustion amount and combustion speed, and there is a limit to the aperture width. The present invention aims to solve such conventional problems, and aims to increase the aperture ratio and achieve low No. 8 combustion.

Means for Solving the Problems In order to solve the above-mentioned problems, the combustion apparatus of the present invention is provided with a variable hole for changing the flame hole of the burner.

Example Embodiments of the present invention will be described below based on the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a flame hole, and this flame hole 1 is constructed in the shape of a pivot-shaped slit in a hollow cylindrical burner body 2. The flame hole 1 is inscribed in the hollow part of this burner body 2.
Correspondingly, a hollow cylindrical rotary tube 4 having a slit hole 3 (also referred to as a variable hole) whose opening gradually widens on the circumference is provided, and both ends of this rotary tube 4 are covered with a sealing material 5. Airtight leakage from the hollow portion of the rotary cylinder 4 is prevented, and the blade end is connected to a motor 6 as a power source, and the other end is connected to a fuel pipe 8 having a fuel passage 7. The motor e is a stepping motor or the like whose rotational position can be freely selected, and the burner body 2 and rotating cylinder 4 are made of a ceramic material with little thermal expansion.

In the above configuration, gas such as fuel or a mixture of fuel and air is sent from the fuel pipe 8 to the rotating cylinder 4, and these gases pass through the slit hole 3 and are ejected from the flame hole 1 of the burner body 2. , ignites and burns. When reducing the amount of combustion, the motor 6 is rotated and the slit hole 3 is gradually made smaller, so that the amount of gas ejected into the flame hole 1 is reduced, and the gas with a constant combustion rate is ejected at a constant pressure. As a result, the ejection speed becomes lower in the flame hole 1, the flame moves from the flame hole 1 to the slit hole 3, and the combustion amount also decreases, which has the effect that the combustion amount can be easily controlled by varying the flame hole. Said motor 6
Solenoid valve as an alternative power source.

There are also direct-acting valves, flame holes 1. The slit hole 3 may be other than a slit, and the variableness of the slit hole 3 may include not only a rotary type but also a sliding type, a needle valve type, and other various methodologies.

Effects of the Invention As described above, the combustion apparatus of the present invention provides the following effects.

(1) There is a hole at the bottom of the flame hole that can gradually reduce its area by the power of a motor, etc., which prevents the gas ejection speed from changing while keeping the flame hole constant as in the past.
Because the ejection speed can always match the combustion speed of the gas,
It has the effect of increasing the aperture ratio of the combustion amount while maintaining good combustion without backfire or lift.

Even in the fully premixed combustion method, since the flame hole area is changed, the slit hole is changed by a motor in conjunction with a combustion state sensor such as ion current or flame temperature, resulting in a completely premixed combustion system with a narrow combustion range. It also supports mixed combustion and maintains stable combustion, so it has the effect of allowing a large throttle ratio with low No.

[Brief explanation of drawings]

FIG. 1 is a side view of a combustion device according to an embodiment of the present invention, with main parts cut away, and FIG. 2 is an exploded perspective view of the burner body shown in FIG. 1. 1...flame hole, 2...-burner body, 3...
...Slit hole, 4...Rotating cylinder. Name of agent: Patent attorney Toshio Nakao and one other person I-
Flame North 2-Burner body 1 Figure 3-7.
Soto hole 4- times lea tube happy 2 figure

Claims (2)

[Claims] (1) The burner body has a variable hole such as a slit hole whose area can be varied in accordance with the flame hole in the lower part of the flame hole, and
A combustion device comprising a device that moves the variable hole using power from a motor or the like. (2) The combustion device according to claim 1, wherein the burner body having flame holes and the material of the variable holes are made of a material with low thermal expansion such as ceramic.