JPS6125963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas burner used in a gas stove or the like, and particularly to a gas burner that prevents lifting at an auxiliary burner opening.

In the case of conventional gas burners used in gas stoves, etc., the head section is configured in a circular ring shape with a secondary airflow passage in the center, with a main flame port on the outer periphery and an auxiliary flame port on the inner periphery. were formed respectively.

The auxiliary flame port is provided as an auxiliary device to evenly heat the center of the pot, for example, and has a lower heat power than the main flame port. However, combustion in the auxiliary flame port tends to cause lift due to the load on the flame port, and it is difficult to achieve stable combustion.

Therefore, recently, the cross-sectional area of the auxiliary flame port is changed in stages to reduce the gas ejection speed to prevent lifting, or the auxiliary flame port is formed diagonally to give the flame holding ability to each other. Some ideas are being considered, such as those that aim to prevent riftening, or those that provide flame stabilizing ability by providing a flame stabilizing wall near the auxiliary flame opening. (For example, Publication of Utility Model Publication No. 41-24926) However, with these methods, it takes time and effort to form the auxiliary flame port, resulting in high costs, and the auxiliary flame port is easily clogged due to overboiling of the broth. be.

The present invention solves these conventional problems, and embodiments thereof will be described below with reference to the accompanying drawings.

In Figs. 1 to 5, reference numeral 1 denotes a circular burner head consisting of a main body 2 and a cap 3, and the air-fuel mixture that flows into the mixing chamber 4 from a mixing pipe (not shown) is
Thereafter, the secondary air a is ejected from the main flame port 5 on the outer periphery and the auxiliary flame port 6 on the inner periphery, and flows through the secondary air flow passage 7 in the center of the burner head 1.
It burns and forms a main flame F and an auxiliary flame F'.

An annular recess 8 is provided on the inner circumference of the cap 3.
A plurality of triangular protrusions 9, which are slightly raised upward from the bottom of the recess 8, are provided at equal intervals. And the above-mentioned auxiliary flame port 6
A set of three is provided on each protrusion 9. Further, the upright wall of the recess 8, that is, the boiling liquid prevention wall 10, is located approximately parallel to the auxiliary flame ports 6 on the outer periphery of the auxiliary flame port group, which is made up of a plurality of auxiliary flame ports 6. It is.

In the above configuration, the secondary air from the secondary air flow path 7 is directed toward the main flame opening 5 where the draft is strongly exerted,
That is, it flows in the outer circumferential direction, and part of it is used for combustion at the auxiliary flame port 6.

Now, in FIGS. 3 and 4, a part of the secondary air a flowing toward the outer circumference collides with the boiling liquid prevention wall 10 during the flow process, forming a vortex b above the auxiliary flame port 6 in the recess 8. It is something to do. Therefore, the mixture ejected from the auxiliary flame port 6 diffuses well with the secondary air and burns, and at the same time, the space between the mixture ejected from the auxiliary flame port 6 and the boiling liquid prevention wall 10 is ejected from the auxiliary flame port. The air-fuel mixture creates a negative pressure area and the auxiliary flame
F' is attached to the auxiliary flame port and the boiling liquid prevention wall 10, and a stable combustion state without lifting can be obtained.

By the way, Fig. 5 compares the combustion characteristics A at the auxiliary flame port of the gas burner shown in Fig. 1 with the combustion characteristics B of a conventional gas burner, and it is clear that A is less likely to cause lifting than B. Recognize.

Further, the boiling liquid prevention wall 10 prevents the flow to the auxiliary flame ports 6 to prevent clogging of the flame ports, and the boiling liquid prevention walls 10 are formed at intervals in the circumferential direction facing the group of auxiliary flame ports. Therefore, the flow of secondary air to the main flame port 5 is not obstructed.

Next, in Figure 6, one of the auxiliary flame ports 6' in the group of auxiliary flame ports is made smaller in diameter than the others, and the air-fuel mixture jetting speed of this auxiliary flame port 6' is slowed down to exhibit a flame-holding effect. This further ensures prevention of lifting. Furthermore, since only one of the auxiliary flame ports is made small in diameter, the amount of auxiliary combustion heat does not decrease.

As explained above, the present invention inverts a part of the secondary air to the auxiliary flame port to generate a vortex, improves the diffusion of the secondary air and the mixture, and at the same time, the auxiliary flame port and the boiling liquid prevention wall. The air-fuel mixture ejected from the auxiliary flame port creates a negative pressure region, and the auxiliary flame F' attaches to the auxiliary flame port and the boiling liquid prevention wall to prevent lifting of the auxiliary combustion flame. A gas burner with stable combustion can be obtained. In addition, it is only necessary to form a boiling liquid prevention wall on the burner head, and the cost is much lower than that in the conventional case where the auxiliary burner port has a special configuration. In addition, the broth prevention wall prevents the broth from flowing into the auxiliary flame port.
The auxiliary flame opening will not be clogged with boiling liquid.

[Brief explanation of the drawing]

Fig. 1 is a half-cut sectional view of a gas burner in an embodiment of the present invention, Fig. 2 is a top view, Fig. 3 is an enlarged plan view of the main part, Fig. 4 is an enlarged sectional view of the main part, and Fig. 5 is a combustion characteristic diagram. , FIG. 6 is a top view of main parts in still another embodiment. 1... Burner head, 5... Main burner, 6,6'
...Auxiliary flame opening, 7...Secondary air flow path, 8...Recess, 9...Protrusion, 10...Boil prevention wall.

Claims (1)

[Claims] 1. A burner head having a secondary air flow passage in the center has a main flame port formed on the outer periphery and an auxiliary flame port formed on the inner periphery, and the auxiliary flame port is formed by a plurality of auxiliary flame ports. A set of auxiliary burner ports is used as a set, and a plurality of these are provided at equal intervals on the inner periphery of the burner head, and a boiling liquid prevention wall is installed on the outer periphery of each of these auxiliary burner port groups, and auxiliary flames are installed near the auxiliary burner port groups. The gas burner is provided in a protruding part that protrudes substantially parallel to the mouth, and the auxiliary burner port group is slightly raised upward from the bottom of the recessed part of the inner periphery of the burner head, the inside of which communicates with the secondary airflow passage. 2. The gas burner according to claim 1, wherein one of the auxiliary burner ports is set to have a smaller diameter than the others.