JPH0561614U - Gas burner - Google Patents

Abstract

(57) [Summary] [Structure] The interior of the burner body 1 has a mixing chamber 4 for mixing fuel gas and primary air, and an annular surface 5 is opened on the upper surface.
And a burner cap 9 on the back side of which a comb-teeth-shaped projection is radially provided over the entire circumference so as to correspond to the annular surface 5, and the burner cap 9 is placed on the annular surface 5.
In the gas burner in which the main flame hole 12 for discharging the mixed gas from the mixing chamber 4 is formed in the gap between the protrusions, the sub chamber 6 is formed outside the mixing chamber 4 of the burner body 1, and the sub chamber 6 is formed.
One end is communicated with the mixing chamber 4 side, and the other end is made to face the lower part of the main flame hole 12 to form the auxiliary chamber flame hole 8. [Effect] Providing a highly reliable gas burner that does not misfire even if the maximum and minimum ratio of the combustion amount is made larger than before, does not require a complicated structure, and there is no need to provide a moving part that causes a problem in service life. There is an effect that can be done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a gas burner used for a gas combustion appliance such as a gas stove for home use.

[0002]

[Prior Art]

 A gas burner for a gas stove has a burner body in which a mixing chamber of fuel gas and primary air is formed, and the upper surface of the burner body forms a flat opening edge. A burner cap is removably mounted on the opening edge of the burner body through comb-shaped protrusions to form a gap between the protrusions as a flame hole. The fuel gas is supplied from the nozzle, and the jet energy is used to suck and mix the primary air, which is then jetted from the flame hole and ignited and burned by a separate igniter. Even if the flow rate of gas supplied from the nozzle is changed suddenly, the primary air does not decrease immediately because of inertial force. There was a possibility of accidental fire. In order to deal with this phenomenon, as disclosed in Japanese Patent Laid-Open No. 3-36418, an example in which a gas expansion chamber that expands at a high gas pressure and contracts at a low gas pressure is provided on the upstream side of a nozzle, and a large thermal power burner are provided. A parent-child burner system that combines a low-power burner and a small-burner burner, and a system that changes the amount of gas from the other nozzle and at the same time changes the primary air hole opening to change the primary air have been proposed.

[0003]

[Problems to be solved by the device]

 Conventional gas burners for gas stoves do not immediately decrease when the gas flow rate supplied from the nozzle is changed rapidly because of the inertial force of the primary air. If the value is large, there was a possibility of a temporary excess air condition and a fire. In addition, the structure is complicated in the improved example, such as a gas expansion chamber that expands at a high gas pressure and contracts at a low gas pressure upstream of the nozzle, and the life and reliability of the movable part with a diaphragm etc. I have a problem.

[0004]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and has a mixing chamber for mixing fuel gas and primary air inside, a burner body having an annular surface opened on the upper surface, and an annular surface on the back surface side. Correspondingly, a comb tooth-shaped protrusion is formed from a burner cap that is radially provided over the entire circumference, and this burner cap is placed on the annular surface, and the burner cap is placed in the gap between the protrusions from the mixing chamber. In a gas burner having a main flame hole for discharging a mixed gas, a sub chamber is formed outside the mixing chamber of the burner body, one end of the sub chamber communicates with the mixing chamber side, and the other end faces the lower part of the main flame hole. It is a vent hole in the sub-chamber.

[0005]

[Action]

 With the above configuration, when the mixture chamber is filled with a mixture of fuel gas and primary air that has a large thermal power and an appropriate primary air ratio, if the gas flow rate is rapidly reduced, The suction amount gradually decreases due to inertial force, and until the combustible mixing ratio corresponding to the small gas flow rate is reached, the air-fuel mixture in the mixing chamber becomes excess primary air and the flame in the main flame disappears, while the sub-combustion chamber disappears. The air-fuel mixture is gradually combustible with the primary air excess air-fuel mixture in the aforesaid mixing chamber. When ignited, the air-fuel mixture ejected from the main flame hole is ignited and continues to burn.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In the figure, the gas burner comprises a burner body 1 and a burner cap 9, and the burner body 1 has a mixing chamber 4 between a central fitting cylinder portion 2 and an outer annular body portion 3. The burner body 1 has an upper surface of an annular body 3 which is open, and an upper end edge of the opening is an annular surface 5 which is inclined downward toward the center.

An auxiliary chamber 6 is attached to a part of the burner body 1 in an airtight manner, communicates with the mixing chamber 4 through a through hole 7, and one end of the burner body 1 is opened at an upper end portion of an annular surface 5 of the burner body 1. The sub-chamber flame hole 8 is formed.

On the other hand, the burner cap 9 has a dish shape, and a mounting cylinder portion 10 that fits into the fitting cylinder portion 2 of the burner body 1 is formed in the central portion. A large number of projections 11 are radially provided at equal intervals on the outer peripheral edge on the back surface side of the burner cap 9 so as to have a comb-like shape as a whole. With the fitting of the mounting tubular portion 10 into the fitting tubular portion 2, these ridges 11 contact the annular surface 5 to form main flame holes 12 that open to the outer peripheral side.

The burner body 1 has a mixing tube portion formed substantially horizontally in the annular body portion 3, and has primary air holes 13 for supplying primary air to the side of the mixing tube portion opposite to the annular body portion 3. A nozzle 14 for ejecting fuel gas is provided at the center of the hole 13.

In the burner configured as described above, when fuel is supplied from the nozzle 14, the primary air is sucked and mixed from the primary air hole 13, and the mixed gas flows from the mixing pipe to the mixing chamber 4 and then from the main flame hole 12. Ejects and is ignited by a separate igniter and burned.

At this time, a part of the air-fuel mixture flows from the through hole 7 to the sub chamber 6 and is replaced with air, and is burned in the sub chamber flame hole 8 to form sleeve fire for the main flame hole 12. As a result, at the time of large combustion, particularly good lift is achieved and good combustion is performed without lifting even with the 12A and 13A gases.

Therefore, if the gas flow rate from the nozzle 14 is rapidly reduced in such a state, the gas flow rate sharply decreases, but the suction amount of the primary air from the primary air hole 13 gradually decreases. Until the combustible mixing ratio corresponding to a small gas flow rate is reached, the air-fuel mixture in the mixing chamber 4 becomes excessive primary air and the flame in the main flame hole 12 disappears, while the air-fuel mixture in the sub-chamber 6 passes through the through-hole. 7 gradually replaces the air-fuel mixture in the mixing chamber 4 with excess primary air, the combustible mixing ratio is maintained and combustion continues in the sub-chamber flame holes 8 to cause sleeve fire to the main flame holes 12 When the combustible mixture ratio is reached, the mixture gas ejected from the main flame holes 12 is ignited to continue burning.

[0014]

[Effect of the device]

 As described above, in the present invention, in the gas burner, the auxiliary chamber is formed outside the mixing chamber of the burner body, and one end of the auxiliary chamber faces the mixing chamber and the other end faces the lower part of the main flame hole. Even if it is larger than the conventional one, it does not cause misfire, has a complicated structure, and does not need to be provided with a moving part whose life is a problem, and it is possible to provide a highly reliable gas burner.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a gas burner showing an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional gas burner.

[Explanation of symbols]

 1 Burner body 4 Mixing chamber 5 Annular surface 6 Sub-chamber 8 Sub-chamber flame hole 9 Burner cap 12 Main flame hole

Claims (1)

[Scope of utility model registration request] 1. A burner body (1) having an inner surface provided with an annular surface (5) and a back surface provided with an annular surface (5), the interior of which is a mixing chamber (4) for mixing a fuel gas and primary air. Then, the comb-teeth-shaped protrusions are formed with burner caps (9) that are radially provided over the entire circumference. The burner caps (9) are placed on the annular surface (5), and the space between the protrusions is increased. In the gas burner in which the main flame hole (12) for discharging the mixed gas from the mixing chamber (4) is formed in the gap of (1), the sub chamber (6) is formed outside the mixing chamber (4) of the burner body (1). ,
A gas burner characterized in that one end of the sub-chamber (6) communicates with the mixing chamber (4) side and the other end faces the lower part of the main flame hole (12) to form a sub-chamber flame hole (8).