JPH0712713U - Flame burner faceplate for gas burner - Google Patents

Abstract

(57) [Summary] [Structure] The heat-resistant plate is provided with the required number of flame ports in a uniformly distributed state, and this flame port group is formed by bringing the required number of flame ports close to each other. In a flame burner face plate for a gas burner, in which a mixture of air and pressurized air is ejected from the flame vent and burned on the surface of the heat-resistant plate, a mixed air flow inlet cross-sectional area of an outer peripheral flame nozzle in the flame nozzle group is mixed air flow. This is a flame burner face plate for a gas burner that is smaller than the outlet cross-sectional area. [Effect] By lowering the flow velocity of the air-fuel mixture flowing out from the outer peripheral flame port in the flame port group to be lower than the flow velocity of the air-fuel mixture flowing out from the inner flame port, the flame lift phenomenon is likely to occur in the outer peripheral flame port. Since the lift phenomenon can be suppressed, incomplete combustion is less likely to occur and lift noise is less likely to be generated. As a result, even if the flow rate and air ratio of the air-fuel mixture are changed over a wide range, the entire flame nozzle face plate It is easy to ensure good combustion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a flame burner face plate for a gas burner, and is particularly used for flame holding in a gas burner with 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, at the outer peripheral flame nozzle of such conventional flame nozzle face plate, 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, the flame The lift phenomenon occurs, resulting in incomplete combustion or a lift noise, which makes it difficult to obtain stable combustion.

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 face plate for a gas burner according to the present invention, the heat-resistant plate is provided with a required number of flame port groups in a uniformly distributed state, and the flame port groups are provided with the required number of flame ports. In a flame burner face plate for a gas burner, which is formed by bringing the ports close to each other, a mixture of raw gas and pressurized air is jetted from the flame port and burned on the surface of the heat-resistant plate,

The cross sectional area of the mixed air flow inlet of the outer peripheral flame nozzle in the flame nozzle group is smaller than the cross sectional area of the mixed air flow outlet.

It is also possible to arrange a required number of flame holding flame openings in a frame shape at the peripheral portion of the heat resistant plate and to make the inlet cross section of the flame holding flame openings smaller than the same outlet cross section. .

[0008]

[Action]

 Since the flame burner face plate for the gas burner according to the present invention is configured as described above, the flow velocity of the air-fuel mixture flowing out from the outer peripheral flame ports in the flame port group is higher than the flow velocity of the air-fuel mixture flowing out from the internal flame ports. Can be lowered.

Further, if a required number of flame holding flame openings are arranged in a frame shape at the peripheral edge of the heat resistant plate and the inlet cross section of the flame holding openings is made smaller than the same outlet cross section, The flow velocity of the air-fuel mixture flowing out from the outer peripheral flame port can be made lower than the flow velocity of the air-fuel mixture flowing out to the inner flame port.

[0010]

【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 arranged 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 step 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 holding frame, which is fastened together with the support frame 3 to the step portion 21 of the inner case 2 by means of screws in a state where the flame mouth face plate 4 is held by 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 to the combustion chamber 62 from the flame port of the flame port face plate, and is burned.

Next, in FIGS. 2 to 4, there are A, A, ... Flame port groups, which are evenly distributed on the flame port face plate 4. This flame port group A is configured by bringing a required number of inner flame ports 42, 42, ... Close to each other, and surrounding the outer circumference by outer peripheral flame ports 43, 43 ,. The inner flame port 42 is a cylindrical through hole (see FIG. 4) and has a substantially constant inner diameter. Further, the outer peripheral flame port 43 is composed of a cylindrical large diameter hole portion 431 on the outlet side and a cylindrical small diameter hole portion 432 on the inlet side. The inner diameter of the large diameter hole portion 431 is substantially equal to the inner diameter of the inner flame opening 42, but the inner diameter of the small diameter hole portion 432 is smaller than the inner diameter of the inner flame opening 42. That is, the cross-sectional area of the outlet of the outer peripheral flame port 43 is larger than the cross-sectional area of the outer peripheral flame port 43. As a result, the flow velocity of the air-fuel mixture flowing out from the outer peripheral flame port 43 can be made lower than the flow velocity of the air-fuel mixture flowing out from the inner flame port 42.

In addition, in the above, in the outer peripheral flame port 43, the connecting portion of the large diameter hole portion 431 and the small diameter hole portion 432 is provided with a taper, but it is not always necessary.

5 to 7 show another embodiment, in which a required number of flame holding flame openings 44, 44, ... Are arranged in a frame shape at the peripheral edge of the flame opening face plate 4. The structure of the flame holding flame ports 44, 44, ... Is substantially the same as that of the outer peripheral flame port 43, and the function thereof is also the same, so the description thereof will be omitted. 5 and 6, M denotes a frame-shaped flame holding flame port group 44.

[0015]

[Effect of device]

 In order to achieve the above object, in the flame burner face plate for a gas burner according to the present invention, the heat-resistant plate is provided with a required number of flame port groups in a uniformly distributed state, and the flame port groups are provided with the required number of flame ports. In a flame burner face plate for a gas burner, which is formed by bringing the ports close to each other, a mixture of raw gas and pressurized air is jetted from the flame port and burned on the surface of the heat-resistant plate,

Since the cross sectional area of the mixed air flow inlet of the outer peripheral flame nozzle in the flame nozzle group is smaller than the cross sectional area of the mixed air flow outlet,

The flow velocity of the air-fuel mixture flowing out from the outer peripheral flame ports in the flame port group can be made lower than the flow velocity of the air-fuel mixture flowing out from the internal flame ports.

Therefore, if this flame burner face plate for a gas burner is used, it is possible to suppress the lift phenomenon at the outer peripheral flame mouth where the lift phenomenon of the flame is likely to occur, so that incomplete combustion is less likely to occur. As a result, lift noise is rarely generated, and as a result, it is easy to ensure good combustion over the entire flame face plate even if the flow rate and air ratio of the air-fuel mixture are changed over a wide range.

Further, if a required number of flame holding flame openings are arranged in a frame shape at the peripheral portion of the heat resistant plate and the inlet cross sectional area of the flame holding flame openings is made smaller than the same outlet cross sectional area, Since the flow velocity of the air-fuel mixture flowing out from the outer peripheral flame mouth can be made lower than the flow velocity of the air-fuel mixture flowing out into the inner flame mouth, the above effect can be further improved in the outer peripheral portion of the flame face plate. it can.

[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 view of a part indicated by an arrow II in FIG.

FIG. 3 is an enlarged view of a part III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a diagram corresponding to FIG. 1 in another embodiment.

FIG. 6 is an enlarged view of a VI portion in FIG.

7 is a sectional view taken along line VII-VII in FIG.

[Explanation of symbols]

 4 ... Flame burner face plate for gas burner 42 ... Inner flame burner (flame burner) 43 ... Outer peripheral flame burner (flame burner) 44 ... Flame retaining flame burner A ... Flame burner group G ... Gas burner M ... Flame retaining flame burner group

Claims (2)

[Scope of utility model registration request] 1. A heat-resistant plate is provided with a required number of flame ports in a uniformly distributed state, and the flame ports are formed by bringing the required number of flame ports close to each other, and raw gas and pressurized air are provided. In a flame burner face plate for a gas burner that ejects a mixture of air from the flame burner and burns on the surface of the heat-resistant plate, a mixed air flow inlet cross-sectional area of the outer peripheral flame nozzles in the flame nozzle group from a mixed air flow outlet cross sectional area Flame burner face plate for gas burners, characterized by its small size. 2. A required number of flame holding flame openings are arranged in a frame shape on the peripheral portion of the heat resistant plate, and an inlet cross sectional area of the flame holding flame openings is made smaller than the same outlet cross sectional area. The flame burner face plate for a gas burner according to claim 1.