JPH0596727U - Flame holding device for gas burner - Google Patents

Abstract

(57) [Summary] [Structure] By disposing a flame face plate in the casing, it is divided into a mixing chamber on the upstream side and a combustion chamber on the downstream side, and raw gas and pressurized air are separated in the mixing chamber. Mix and
In a gas burner that ejects this air-fuel mixture from the flame opening of the flame opening face plate and burns it on the downstream side of the flame opening face plate, a required number of flame holding flame openings are arranged in a frame shape at the peripheral edge of the flame opening face plate. A required number of main flame openings are arranged inside a series of flame holding flame openings, and a baffle plate is projectingly provided on the side of the mixing chamber of the flame opening face plate in the casing, and the baffle plate forms a gap between the inlets of the flame holding flame openings. It is a flame holding device for a gas burner covered via [Effect] Since the flow velocity of the air-fuel mixture flowing out from the flame holding flame port can be easily reduced as compared with the flow velocity of the air-fuel mixture flowing into the flame holding flame port, the flow rate of the air-fuel mixture can be increased or the air ratio can be increased. Even so, the lift phenomenon is less likely to occur in the flame at the outer peripheral flame mouth of the flame face plate, and as a result, it is easy to easily ensure good combustion over the entire flame face plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flame holding device for a gas burner, and particularly to a gas burner having a plate-shaped flame face plate and having a high load and a high air ratio.

[0002]

[Prior Art]

 In a high-load, high-air-ratio gas burner equipped with a plate-shaped flame nozzle face, the flames in each nozzle group heat each other to raise the temperature and increase the combustion speed.

[0003]

[Problems to be solved by the device]

 However, since there is a flame that is adjacent to only one side of the flame related to the flame mouth of the outer peripheral part of the flame face plate, the temperature does not rise easily, and as a result, the air-fuel mixture (gas mixture of raw gas and combustion air) When the flow rate is increased or the air ratio is increased, a lift phenomenon occurs in the flame around the outer periphery, which causes incomplete combustion or a lift noise, which causes a problem.

An object of this invention is to eliminate such inconvenience.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the flame burner for a gas burner according to the present invention, by arranging a flame face plate in the casing, it is divided into a mixing chamber on the upstream side and a combustion chamber on the downstream side, In a gas burner in which raw gas and pressurized air are mixed in the mixing chamber, the mixture is jetted from the flame mouth of the flame face plate and burned at the downstream side of the flame face plate,

[0006] A required number of flame holding flame openings are arranged in a frame shape on the periphery of the flame opening face plate, and a required number of main flame openings are arranged inside the series of flame holding flame openings.

A baffle plate is provided so as to protrude from the flame port face plate in the casing toward the mixing chamber, and the baffle plate covers the inlet of the flame holding flame port through a gap.

[0008]

[Action]

 Since the flame holding device for a gas burner according to the present invention is configured as described above, it is possible to reduce the flow pressure of the air-fuel mixture flowing into the flame holding flame port, and as a result, the gas mixture flowing out from the flame holding flame port is discharged. It is possible to easily lower the flow velocity of the above than the flow velocity of the air-fuel mixture flowing into the flame holding flame port.

If the gap is formed by bending the baffle plate, the gap can be easily formed.

Further, the gap may be formed by integrally forming a ridge frame on the peripheral edge portion of the flame face plate.

[0011]

【Example】

 In FIG. 1, 1 is an outer shell of the gas burner G (corresponding to the “casing” of the present invention), 2 is an inner shell located inside the outer shell 1 (corresponding to the “casing” of the present invention) Is. The inner case 2 is welded and fixed to the inner wall surface of the outer case 1 via a step portion 21. Reference numeral 3 denotes a support frame, which is fixed to the stepped portion 21 of the inner case 2 via the packing 31 with screws. The support frame 3 supports the peripheral end of the ceramic flame face plate 4. Reference numeral 5 is a pressing frame, which is fastened together with the support frame 3 by screws with the step portion 21 of the inner case 2 in a state of pressing the flame face plate 4 through the packing 41.

Next, 61 is a mixing chamber, which is arranged in the inner case 2 below the flame face plate 4. In this mixing chamber 61, the raw gas supplied from the nozzle 7 and the combustion air supplied from the blower 8 are mixed. The mixed air-fuel mixture is pressure-equalized by the pressure equalizing plate 9, flows out from the flame port of the flame port face plate into the combustion chamber 62, and is burned.

Next, in FIG. 2, reference numerals 42, 42, ... Show main flame ports, which are formed inside the flame port face plate 4. The main flame port 42 is a cylindrical through hole, and the inner diameter is substantially constant. Further, 43, 43, ... are flame holding flame openings, which are formed in a frame shape at the peripheral edge of the flame opening face plate 4. The flame holding flame port 43 has the same shape and inner diameter as the main flame port 42. Reference numeral 31 is a baffle plate portion, which is formed by extending the support frame 3 inward. The baffle plate portion 31 covers the inlets of the flame holding flame openings 43, 43, ... Through a gap S. Therefore, the amount of the air-fuel mixture flowing into the flame holding flame port 43 becomes smaller than the amount of the air-fuel mixture flowing into the main flame opening 42, and the flow velocity of the air-fuel mixture flowing out from the flame holding flame port 43 flows out from the main flame opening 42. Lower than the flow rate of the air-fuel mixture.

The gap S in FIG. 2 is formed by providing the bead 32 on the support frame 3, but as shown in FIG. 3, the ridge frame 45 is integrally formed on the peripheral edge portion of the flame face plate 4. It can also be formed by doing so.

[0015]

[Effect of the device]

 A flame holding device for a gas burner according to the present invention is divided into an upstream mixing chamber and a downstream combustion chamber by disposing a flame face plate in a casing, and raw gas and pressurized air are mixed in the mixing chamber. In a gas burner that mixes with, ejects this mixture from the flame opening of the flame opening face plate, and burns it on the downstream side of the flame opening face plate,

[0016] A required number of flame holding flame openings are arranged in a frame shape on the peripheral portion of the flame opening face plate, and a required number of main flame openings are arranged inside the series of flame holding flame openings.

Since a baffle plate is provided so as to project from the flame port face plate in the casing toward the mixing chamber, and the baffle plate covers the inflow port of the flame holding flame port through a gap,

As a result of being able to lower the flow pressure of the air-fuel mixture flowing into the flame holding flame port, the flow velocity of the air-fuel mixture flowing out from the flame holding flame port can be easily reduced as compared with the flow velocity of the air mixture flowing into the flame holding flame port. Can be made.

Therefore, if this flame burner for a gas burner is used, even if the flow rate of the air-fuel mixture (gas mixture of raw gas and combustion air) is increased or the air ratio is increased. Since the lift phenomenon does not easily occur in the flame at the outer peripheral flame mouth of the flame face plate, incomplete combustion is less likely to occur and lift noise is less likely to occur. It is easy to ensure combustion.

If the gap is formed by bending the baffle plate, it is easy to form the gap.

The gap can also be formed by integrally forming a convex strip frame on the peripheral edge portion of the flame face plate.

[Brief description of drawings]

FIG. 1 is a sectional view of a flame holding device for a gas burner according to the present invention.

FIG. 2 is an enlarged sectional view of a II part in FIG.

FIG. 3 is a diagram of another embodiment corresponding to FIG.

[Explanation of symbols]

1. G ... Gas burner 1 ... Outer case (casing) 2 ... Inner case (casing) 31 ... Baffle plate part (baffle plate) 4 ... Flame face plate 42 ... Main flame port 43 ... Flame holding flame port 61 ... Mixing chamber 62… Combustion chamber

Claims (3)

[Scope of utility model registration request] 1. A flame nozzle plate is arranged in a casing to divide it into a mixing chamber on the upstream side and a combustion chamber on the downstream side, and raw gas and compressed air are mixed in the mixing chamber. In a gas burner for injecting an air-fuel mixture from the flame opening of the flame opening face plate and burning it on the downstream side of the flame opening face plate, a required number of flame holding flame openings are arranged in a frame shape at the peripheral portion of the flame opening face plate. A required number of main flame openings are arranged inside the flame holding flame opening, and a baffle plate is projected on the mixing chamber side of the flame opening face plate in the casing, and a gap is formed between the inlet of the flame holding flame opening by this baffle plate. Flame holding device for gas burner characterized by being covered with 2. A flame holding device for a gas burner according to claim 1, wherein the gap is formed by bending the baffle plate. 3. The flame holding device for a gas burner according to claim 1, wherein the gap is formed by integrally forming a protruding frame on a peripheral edge portion of the flame nozzle face plate.