JP3403826B2 - Burner flame stabilizer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas burner used as a heat source for industrial gas boilers, hot water pools, etc., a so-called Bunsen burner, and more particularly to improvement of a flame nozzle plate for ejecting a flame. .

[0002]

2. Description of the Related Art In general, a Bunsen burner flame plate is a plate-shaped member attached to the upper surface of a mixing chamber for mixing gas and air, and has a myriad of small holes, that is, flames, that communicate the front and back. A spout is provided. Then, a mixed gas of air and gas generated in the mixing chamber, that is, a mixed gas is ejected to the outside through a flame injection port, ignited and burned. At this time, since it is preferable that the height of the combustion flame is at a substantially constant position over the entire area of the flame mouth plate, the size of the flame nozzles provided in the flame mouth plate is made as uniform as possible when manufacturing the flame mouth plate. Is considered to be.

[0003]

However, even if such consideration is taken, heat is supplied from the surroundings in the central portion of the flame mouth plate, so that the combustion temperature becomes high, the propagation speed of the flame becomes high, and the flame tip becomes high. On the other hand, there is a tendency for the temperature to decrease, while the peripheral edge of the flame nozzle plate supplies less heat from the surroundings, resulting in a lower combustion temperature and a slower flame propagation speed. As a result, the tip of the flame tends to be higher than that in the central portion, and if it is remarkable, the surrounding flame may lift.

[0004]

In order to solve the above-mentioned problems, the present invention provides a flame vent plate covering one surface of a mixing chamber with a large number of thin through holes communicating the front and back, and supporting the peripheral edge of the flame vent plate. In addition to being supported by a frame, the flame vent plate is divided into a peripheral portion and a core portion, and a flow restricting means is provided in a mixed gas passage communicating with the mixing chamber and the peripheral portion. Specifically, the flame vent plate sandwiches both sides of the peripheral portion by the support frame, and arranges a spacer between the flame vent plate and the support frame,
The spacer is provided with a vent hole which serves as a flow restricting means.

More specifically, the flame vent plate sandwiches both sides of the peripheral edge portion with support frames, and a spacer is arranged between the flame vent plate and the support frame so that the lower surface of the flame vent plate and the support frame are separated from each other. A narrow space formed between them is configured as a flow restricting means. If necessary, the peripheral edge of the flame nozzle plate is further divided into an inner circumference and an outer circumference, and the outer circumference is communicated with a pressure source of air to form an air curtain. The flame vent plate is supported by a support frame, and a packing is sandwiched between the flame vent plate and the support frame, and the packing divides the peripheral edge portion and the core portion.

[0006]

[Function] The flame around the flame vent plate is due to the air curtain.
Since a part of the air supplied to the
Since the fuel ratio tends to be lean and the heat supply from the outer circumference is small, the flame propagation speed decreases as the combustion temperature decreases,
The flame tends to separate from the flame plate by being pushed by the velocity of the mixed gas ejected, but the flow velocity of the mixed gas flowing out of the flame plate is reduced by the flow restricting means, and the flame is the velocity of the mixed gas ejected. Cause a tendency to overcome. That is, since the flame has a tendency to go up toward the flame mouth plate, the tendency that the tip of the flame is higher than that of the central portion is offset.

[0007]

The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, 10 is a gas burner using the present invention. The gas burner 10 is composed of a housing 12 whose upper opening is covered with a flame vent plate 11. An air fan 13 attached to the side is connected to the housing 12, and a gas nozzle 14 is attached to the lower surface. As shown in FIG. 5, the inside of the housing 12 has a partition plate 12a provided in a horizontal direction.
Is divided into a lower mixing chamber 12b and an upper mixing chamber 12c, and the two chambers 12b and 12c are connected to each other through a perforated plate 12d made of punching metal provided on the side.
Reference numeral 12e is a ventilation hole provided in the porous plate 12d.

An air fan 13 and a gas nozzle 14 are connected to the housing 12, and the air fan 13 supplies atmospheric air and the gas nozzle 14 simultaneously supplies city gas and other gases. The air sent from the air fan 13 flows inside the lower mixing chamber 12b from the right side to the left side in FIG. 5, but the gas supplied from the gas nozzle 14 is mixed in the middle of the lower mixing chamber 12b, and the mixed gas having a predetermined air ratio is mixed. Is generated. The mixed gas passes through the perforated plate 12d when flowing from the lower mixing chamber 12b to the upper mixing chamber 12c. The perforated plate 12d causes violent turbulence in the mixed gas passing therethrough, thereby stirring the air and the gas to prepare a homogeneous mixed gas.

Therefore, the air and gas form a homogeneous mixed gas having an air ratio of 1.1 to 1.3 inside the housing 12 and reach the lower surface of the flame nozzle plate 11. In addition, 23 is a high voltage electric device for igniting the mixed gas, 23a is an ignition coil, 23b is an ignition electrode, and both are connected by a high voltage electric wire 23c.

An air passage 20 is formed in the housing 12 outside the lower mixing chamber 12b and is partitioned by a partition wall 18a. The upstream side of the air passage 20 is connected to the upstream side of the gas nozzle 14 of the lower mixing chamber 12b. Therefore, only the gas-free air is fed into the air fan 13 under pressure. The downstream end of the air passage 20 communicates with an air injection port 21 provided along the outer edge of the flame nozzle plate 11. Thus, when the air fan 13 is operated, air is ejected in a wall shape from the air ejection port 21 and acts as an air curtain that surrounds the periphery of the mixed gas and partitions the inside and outside thereof. That is,
The atmosphere is prevented from flowing into the mixed gas supplied from the air injection port 21 to the inside.

The flame vent plate 11 is made of a ceramic plate. There are innumerable communication holes 11a that form flame jets.
And the communication hole 11a is provided so as to penetrate the front and back of the ceramic plate. In this embodiment, the flame vent plate 11 is composed of three substantially square plates, which are supported by the support frame 1.
The peripheral portion is supported by 5 and is formed in a rectangular shape as a whole. In addition, this shape is not limited to a square,
Sometimes it is made into a circle or an ellipse.

A support frame 15 for reinforcing the flame vent plate 11.
Has a rectangular frame-like frame. It comprises an upper plate 15a formed by bending a steel plate to form a zigzag cross section, and a lower plate 15b attached so as to cover the lower surface thereof.
By these, the peripheral portion of the flame vent plate 11 is sandwiched and supported from both sides. The upper plate 15a is provided with a large number of slits 15c on the inner edge thereof, so that when the support frame 15 is expanded by receiving the combustion heat of gas, it is provided to absorb the distortion. is there.

A packing 16 is provided on one side and a cushioning material 17 is provided on the other side between the flame vent plate 11 and the support frame 15 so that the mixed gas bypasses the flame vent plate 11. The flow of heat is prevented and the difference in thermal expansion between the flame vent plate 11 and the support frame 15 is absorbed. Also, packing 16
As shown in FIG. 6, one of the lower plate 15b and the lower plate 15b has a vent hole that acts as the mixed gas passage 25 and closes the vent holes. That is, the flame mouth plate 1
It has a function of dividing the injection port 1 into a peripheral portion and a core portion. In addition, a flow restricting means 26 is formed in the mixed gas passage 25 leading to the peripheral portion to narrow the passage. The packing 16 is made of a material such as silicon or rubber, and the lower plate 15b is made of a material such as iron or stainless.

The modes of the mixed gas passage 25 and the flow restricting means 26 are not limited to this, but may be formed as shown in FIG. 7 by using packing as the spacer. Here, the width of the lower plate 15b is formed slightly wider than that of the packing 16, and as a result, the flame port plate 11 and the lower plate 1 are formed.
5b is a narrow gap 1 approximately equal to the width of the packing 16.
8 is formed. Thus, the inlet of the flame nozzle 11a located above the lower plate 15b opens into the upper mixing chamber 12c through the narrow gap 18. Therefore, the flow velocity of the mixed gas sent to the peripheral portion of the flame nozzle plate 11 can be kept relatively low as compared with the flow velocity of the core portion.

Next, the operation of the embodiment gas burner 10 will be described. When the gas burner 10 starts operating, the mixed gas is pressure-fed to the lower surface of the flame nozzle plate 11. The mixed gas is a flame plate 11
From the lower surface to the upper surface and is jetted into the atmosphere, and at that moment, spark ignition is performed by the ignition electrode 23b. The outer periphery of the flame is shielded from the outside air by the air curtain formed by the wall-shaped air flow ejected from the air ejection port 21, so that the air ratio of the mixed gas inside does not largely change.
On the plate surface of the flame nozzle plate 11, the mixed gas maintains a substantially uniform air ratio as a whole, and excellent flame holding property is obtained.

However, in the peripheral portion of the flame vent plate 11,
The air-fuel ratio tends to be lean because some of the outside air or the air supplied for the air curtain is mixed into the mixed gas to some extent. Therefore, the flame propagation speed decreases there, and the lower edge of the flame tends to be far from the flame vent plate 11 as compared with the core portion. On the other hand, the flow rate of the mixed gas supplied thereto is slowed down by the flow restricting means 26 provided in the mixed gas passage 25, and the flame is likely to go up. Therefore, they are offset, the position of the flame stops at substantially the same position as the core, and the height and the color of the flame formed on the flame port plate 11 are stabilized.

[0017]

As described above, according to the present invention, since the velocity of the gas supplied to the peripheral portion of the flame mouth plate is suppressed by the flow restricting means 26, the flame of this portion goes up toward the flame mouth plate. Give rise to a tendency. This phenomenon is offset by the tendency of the flame propagation speed to decrease with the decrease of the combustion temperature and the tendency to move away from the flame mouth plate, and the position of the flame becomes stable.

Further, if the flow rate controlling means is utilized by utilizing the gap between the flame port plate and the supporting frame supporting it, or if the throttle as the flow rate controlling means is provided in the packing,
Since the main part of the flow rate control means uses the member originally attached to the flame mouth plate, the device is not complicated and a great economic effect is produced. Further, if an air injection port for an air curtain is provided at the edge of the flame plate, the mixture of the atmosphere with the mixed gas is reduced, the flame becomes stable, and the decrease of the heat power by using the limiting means can be minimized. effective.

[Brief description of drawings]

FIG. 1 is a front view of a gas burner showing an embodiment of the present invention.

FIG. 2 is a right side view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a plan view thereof.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is an enlarged cross-sectional view showing an enlarged main part thereof.

FIG. 7 is an enlarged cross-sectional view of a main part showing a modified example.

[Explanation of symbols]

10 ... Gas burner 11 ... 11a ... communication hole (flame spout) 12 ... 12a ... compartment plate 12b ... Lower mixing chamber 12c ... Upper mixing chamber 12d ... perforated plate 12e ... Vent 13 ... Air fan 14 ... Gas nozzle 15 ... Support frame 15a ... top plate 15b ... lower plate 15c ... slit 16 ... Packing 16a ... through hole 17 ... Cushioning material 18 ... 18a ... Partition wall 20 ... Air passage 21 ... Air jet 23 ... High-voltage electric devices 23a ... Ignition coil 23b ... Ignition electrode 23c ... High voltage electric wire 25 ・ ・ ・ Mixed gas passage 26 ... Flow restricting means

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-157413 (JP, A) JP-A-3-194307 (JP, A) JP-A-1-302016 (JP, A) Actual development Sho-62- 192015 (JP, U) Actual Open 1-12-1039 (JP, U) Actual Open 60-81439 (JP, U) Actual Open 59-144333 (JP, U) Actual Open 59-59628 (JP, U) 62-180216 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F23D 14/02-14/18 F23D 14/70

Claims (3)

(57) [Claims] 1. A flame vent plate covering one surface of a mixing chamber is provided with a large number of thin through holes communicating the front and back, and the peripheral edge of the flame vent plate is provided with packing.
Supported by the support frame via the said burner port plate
It was divided into a peripheral portion and the core portion by the packing, when the mixed gas passage leading to the mixing chamber and the peripheral portion Ru provided flow restriction means co
In addition, the peripheral portion is further divided into an inner circumference and an outer circumference, and the outer circumference
That is in communication with the air pressure source
Form a curtain to prevent air from entering the gas mixture
Flame stabilization device of the burner and composed. 2. The mixing according to claim 1, wherein the flame mouth plate sandwiches both sides of the peripheral edge portion by a support frame, and a packing is arranged between the flame mouth plate and the support frame, and the packing serves as a flow restricting means. Burner flame stabilizer with gas passage. 3. The flame vent plate according to claim 1, wherein both sides of a peripheral edge portion of the flame vent plate are sandwiched by support frames, and packing is arranged between the flame vent plate and the support frame to reduce the width of the support frame.
By forming it slightly wider than this packing, a narrow flow restricting means is formed between the lower surface of the flame nozzle plate and the support frame.
A flame stabilization device for a burner that forms a gap .