JP2011085281A - Gas burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain an air excess ratio of mixed gas at a level suitable for combustion and to reduce the size of an entire gas burner even when the length of a mixing tube is set smaller than that of a conventional mixing tube. <P>SOLUTION: The gas burner includes: a burner body 11 having an inner/outer double cylinder shape; the mixing tube 12 continued to the outer cylinder peripheral face of the burner body 11; and a nozzle 14 injecting gas to the gas inlet 32 of the mixing tube 12. Together with combustion air, gas injected from the nozzle 14 is guided to a gas distribution chamber 21 inside the burner body 11 through the mixing tube 12. A narrow passage 23 is provided at the peripheral edge of a distribution chamber inlet 31 continued to the distribution chamber 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a gas burner incorporated in a gas stove.

  In a conventional gas burner incorporated in a gas stove, the length of the venturi-shaped mixing tube that guides the mixed gas of gas and air to the internal space of the burner body is such that the excess air ratio of the mixed gas is at a level suitable for combustion. It is set relatively long (for example, see Patent Document 1).

  As shown in FIGS. 6 (a) and 6 (b), the conventional gas burner 7 includes an inner / outer double cylindrical burner body 71 and a venturi-shaped mixing extending from the distribution chamber inlet 91 of the burner body 71 to the side thereof. And a gas 72 injected from the nozzle 74 toward the gas inlet 92 of the mixing pipe 72 is mixed with a predetermined amount of air drawn into the mixing pipe 72 from the periphery of the gas inlet 92 by the venturi effect. Then, it is configured such that it is introduced into the distribution chamber 81 inside the burner body 71 as a mixed gas with an excess air ratio suitable for combustion, and further discharged from the flame hole 730 on the back surface of the burner head 73 to the external space of the gas burner 7.

JP 2002-267112 A

However, in the conventional gas burner 7, the length L2 of the mixing tube 72 is set long (for example, approximately ½ of the total length L1 of the gas burner main body 70) to secure a negative pressure formation region, and excess air in the mixed gas Since the rate is maintained at a level suitable for combustion, there is a problem that the entire gas burner 7 becomes relatively large.
This invention is made | formed in view of the point which concerns, and makes it a subject to aim at size reduction of the whole gas burner.

The gas burner according to the present invention is
It has an inner / outer double cylindrical burner body, a mixing pipe connected to the outer cylinder circumferential surface of the burner body, and a nozzle for injecting gas to the gas inlet of the mixing pipe, and the gas injected from the nozzle together with combustion air In the gas burner configured to lead to the gas distribution chamber inside the burner body through the mixing tube,
A narrow passage is provided at the periphery of the entrance of the distribution chamber connected to the distribution chamber.
According to the above configuration, since the negative pressure forming area is secured by the narrow passage provided at the periphery of the distribution chamber inlet, even if the length of the mixing tube is set shorter than that of the conventional one, the excess air of the mixed gas The rate can be maintained at a level suitable for combustion.

  In the gas burner, it is desirable to provide a convex portion protruding toward the distribution chamber inlet at a position on the outer peripheral surface of the inner cylinder of the burner body and facing the distribution chamber inlet.

  When the mixed gas introduced to the distribution chamber inlet collides with the outer peripheral surface of the inner cylinder of the burner body, a stagnation point of zero velocity air is formed at the center of the collision part, reducing the ability to suck air into the mixing tube Let However, in this case, the stagnation point is reduced by the convex portion provided at the position facing the distribution chamber inlet, and the mixed gas is smoothly guided to the narrow passage, so that the excess air ratio of the mixed gas is improved. Accordingly, the length of the mixing tube can be set shorter accordingly.

  In the gas burner, it is preferable that at least a region facing the distribution chamber inlet on the outer peripheral surface of the inner cylinder of the burner body is formed in a curved convex shape.

  In this case, since the mixed gas fed into the mixing tube is smoothly guided to the narrow passage along the curved convex surface formed on the outer peripheral surface of the inner cylinder, the ability to suck air into the mixing tube is improved. Accordingly, the length of the mixing tube can be set shorter accordingly.

Since the present invention has the above configuration, the present invention has the following specific effects.
Even if the length of the mixing tube is set shorter than that of the conventional one, the excess air ratio of the mixed gas can be maintained at a level suitable for combustion, so that the entire gas burner can be reduced in size.

The longitudinal cross-sectional schematic diagram (a) and XX cross-sectional schematic diagram (b) of the gas burner which concerns on embodiment of this invention. The graph which shows the relationship between the width | variety of a narrow passage and the excess air ratio in the gas burner which concerns on embodiment of this invention. The longitudinal cross-sectional schematic diagram (a) and XX cross-sectional schematic diagram (b) of the gas burner which concerns on other embodiment of this invention. The longitudinal cross-sectional schematic diagram (a) and XX cross-sectional schematic diagram (b) of the gas burner which concerns on other embodiment of this invention. The longitudinal cross-sectional schematic of the gas burner which concerns on other embodiment of this invention. The longitudinal cross-sectional schematic diagram (a) and YY cross-sectional schematic diagram (b) of the conventional gas burner.

Next, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIGS. 1 (a) and 1 (b), a gas burner 1 according to an embodiment of the present invention is an external flame type burner incorporated in a gas stove, and mainly an inner / outer double cylindrical burner body 11. A venturi-shaped mixing tube 12 integrally formed on the outer wall of the burner body 11, an annular burner head 13 mounted on the upper portion of the burner body 11, and a gas supplied from a gas pipe (not shown) The nozzle 14 injects into the pipe 12.

  An annular gas passage (hereinafter referred to as “distribution chamber”) 21 surrounded by the inner cylinder 11 a and the outer cylinder 11 b is formed in the burner body 11. This distribution chamber 21 is connected to the flame hole 130 formed on the back surface of the outer peripheral edge of the burner head 13 through the upper opening 30 of the burner body 11, while it is the inner peripheral surface of the outer cylinder 11b and the outer cylinder 11b. It is connected to the internal space (hereinafter referred to as “mixing path”) 22 of the mixing pipe 12 via a distribution chamber inlet 31 established at a substantially central position between the upper and lower sides.

  The gas inlet 32 of the mixing tube 12 faces the tip of the nozzle 14. When gas is injected from the nozzle 14 toward the gas inlet 32, the injected gas passes through the mixing path 22 and is distributed. It is sent to the inlet 31 side. When the gas is fed into the mixing path 22, the mixing path 22 has a negative pressure due to the venturi effect in the mixing path 22, and the air around the gas inlet 32 is drawn into the mixing path 22 together with the gas. Then, this mixed gas of gas and air is guided from the distribution chamber inlet 31 to the distribution chamber 21 through a narrow passage 23 described later, and further discharged from the flame hole 130 thereabove to the outer periphery of the burner body 11.

  On the outer periphery of the distribution chamber inlet 31, a narrow passage 23 is extended as a negative pressure forming portion that is connected to the distribution chamber 21 and has a smaller flow area than the distribution chamber inlet 31. Specifically, in a predetermined region on the outer peripheral surface of the inner cylinder 11 a and facing the distribution chamber inlet 31, a planar standing wall having a larger projected area than the distribution chamber inlet 31 (hereinafter referred to as “inner cylinder plane portion”). 15A is formed on the inner peripheral surface of the outer cylinder 11b and in a predetermined region facing the inner cylinder plane part 15A, a plane part wider than the inner cylinder plane part 15A (hereinafter referred to as “outer cylinder plane part”). 15B is formed, and the distribution chamber inlet 31 is formed at a substantially central portion of the outer cylinder flat portion 15B. The distribution chamber 21 is connected at the end of a gap (narrow passage) 23 between the inner cylinder flat portion 15A and the outer cylinder flat portion 15B formed on the outer peripheral side of the distribution chamber inlet 31, and is sent into the communication passage 22. The mixed gas of air and air is led to the distribution chamber 21 through the narrow passage 23 extending in the circumferential direction from the distribution chamber inlet 31.

  In the present embodiment, the diameter D2 of the distribution chamber inlet 31 is set to about 13 mm, and the width W3 of the narrow passage 23 is set to about 3 mm. Compared to the flow area of the distribution chamber inlet 31, the distribution chamber inlet 31 is set. The flow path area of the outer narrow passage 23 is smaller. Therefore, when the mixed gas fed into the mixing passage 22 flows from the distribution chamber inlet 31 to the narrow passage 23, the inside of the mixing passage 22 becomes further negative pressure due to the venturi effect in the narrow passage 23, and is mixed from the gas inlet 32. The ability to suck air into the passage 22 is improved. That is, by extending the narrow passage 23 in the circumferential direction of the distribution chamber inlet 31, a negative pressure forming region is secured, and the ability to suck air into the mixing passage 22 is improved.

  FIG. 2 is a graph showing the relationship between the width W3 of the narrow passage 23 and the excess air ratio. As can be seen from this graph, the excess air ratio of the mixed gas is highest when the width W3 of the narrow passage 23 is set to about 3 mm, and is close to a value suitable for combustion.

  Therefore, in the present embodiment, the length of the mixing tube 12, that is, the length L2 from the gas inlet 32 to the distribution chamber inlet 31 is set to about 35 mm (about 2/5 of the total length L1 of the gas burner body 10).

  As described above, in the gas burner 1 according to the above-described embodiment, the negative pressure forming region is secured by the narrow passage 23 extending in the circumferential direction of the distribution chamber inlet 31, and the ability to suck air into the mixing passage 22 is improved. Therefore, even if the length of the mixing tube 12 is set shorter than the conventional one, the excess air ratio of the mixed gas can be maintained at a level suitable for combustion. As a result, the gas burner 1 as a whole can be downsized.

[Other Embodiments]
In addition, although the inner cylinder plane part 15A in the said embodiment is formed in simple plane shape, as shown to Fig.3 (a) and (b), the distribution chamber inlet_port | entrance 31 on the inner cylinder plane part 15A and A spherical mountain-shaped convex portion 16 that protrudes toward the distribution chamber inlet 31 may be provided at a position opposite to the center of the distribution chamber inlet 31.

  In this case, since the mixed gas sent out from the distribution chamber inlet 31 toward the inner cylinder flat portion 15A is smoothly guided to the narrow passage 23 along the surface of the convex portion 16, air is sucked into the mixing passage 22. Ability improves. Accordingly, the length of the mixing tube 12 can be set to be shorter accordingly.

  Moreover, in the said embodiment, while forming the inner cylinder plane part 15A in the outer peripheral surface of the inner cylinder 11a, the outer cylinder plane part 15B is formed in the inner peripheral surface of the outer cylinder 11b, and this inner cylinder plane part 15A is opposed. The distribution chamber 21 is opened at substantially the center of the outer cylinder flat surface portion 15B. As shown in FIGS. 4A and 4B, a predetermined region facing the distribution chamber inlet 31 on the outer peripheral surface of the inner cylinder 11a. In addition, a curved raised wall (hereinafter referred to as an “inner cylinder convex surface portion”) 17A having a projection area wider than that of the distribution chamber inlet 31 is formed, and on the inner peripheral surface of the outer cylinder 11b and along the inner cylinder convex surface portion 17A. A curved concave surface portion (hereinafter referred to as an “outer cylindrical concave surface portion”) 17B wider than the inner cylindrical convex surface portion 17A is formed in a predetermined region facing each other, and the outer cylindrical concave surface portion 17B facing the inner cylindrical convex surface portion 17A is substantially abbreviated. A distribution room entrance 31 may be opened in the center.

  In this case, since the mixed gas sent from the distribution chamber inlet 31 toward the inner cylindrical convex surface portion 17A is smoothly guided to the narrow passage 23 along the inner cylindrical convex surface portion 17A, air is sucked into the mixing passage 22 Ability improves. Accordingly, the length of the mixing tube 12 can be set to be shorter accordingly.

  Furthermore, by providing the spherical mountain-shaped convex portion 16 described in the other embodiment on the inner cylinder convex surface portion 17A at a position facing the distribution chamber inlet 31 and on the center line of the distribution chamber inlet 31 (FIG. 4 (a) and (b)), the ability to suck air into the mixing path 22 is further improved, and accordingly, the length of the mixing pipe 12 can be set shorter.

  In each of the above embodiments, the distribution chamber inlet 31 is provided at a substantially central position between the upper and lower sides of the outer cylinder 11b. However, as shown in FIG. 5, it may be provided at a lower side position of the outer cylinder 11b.

  In this case, even if a small amount of spilled water flows into the distribution chamber 21, it is quickly discharged out of the gas burner 1 from the mixing path 22, so that dirt does not easily accumulate in the burner head 11.

DESCRIPTION OF SYMBOLS 1 ... Gas burner 11 ... Burner body 11a ... Inner cylinder 11b ... Outer cylinder 12 ... Mixing tube 13 ... Burner head 14 ... Nozzle 21 ... Distribution chamber 22 ... Mixing path 23 ... narrow passage 31 ... distribution chamber inlet 32 ... gas inlet

Claims (3)

It has an inner / outer double cylindrical burner body, a mixing pipe connected to the outer cylinder circumferential surface of the burner body, and a nozzle for injecting gas to the gas inlet of the mixing pipe, and the gas injected from the nozzle together with combustion air In the gas burner configured to lead to the gas distribution chamber inside the burner body through the mixing tube,
A gas burner, characterized in that a narrow passage is provided at the periphery of the distribution chamber inlet leading to the distribution chamber. The gas burner according to claim 1,
A gas burner, characterized in that a convex portion protruding toward the distribution chamber inlet is provided at a position on the outer peripheral surface of the inner cylinder of the burner body and facing the distribution chamber inlet. The gas burner according to claim 1 or 2,
A gas burner characterized in that at least a region facing the distribution chamber entrance on the outer peripheral surface of the inner cylinder of the burner body is formed in a curved convex shape.

Images