JP4675912B2 - Burner equipment - Google Patents

Description

  The present invention relates to a burner device that takes in primary air together with fuel gas ejected from a gas ejection nozzle and burns it with the mixed gas.

  Conventionally, this type of burner device has a suction port through which a gas ejection nozzle faces to allow the fuel gas and primary air to flow in, and a mixed gas that generates a mixed gas by mixing the fuel gas and the primary air flowing in from the suction port. A pipe part is provided, and combustion is performed by supplying the mixed gas mixed by the mixing pipe part to a flame hole. In addition, a throat portion having a smaller diameter than the suction port is provided between the suction port and the mixing pipe portion, and when the fuel gas and the primary air pass through the throat portion, both flows are disturbed. The fuel gas and the primary air are smoothly mixed in the mixing tube portion.

  By the way, in this type of burner device, a funnel-shaped suction port body having a suction port at one end and a throat portion at the other end is integrally connected to the upstream end of the mixing tube portion, and is integrated with the suction port body. A structure is known in which a nozzle holder is screwed and connected to a connecting plate that is connected to the nozzle, so that the gas ejection nozzle held by the nozzle holder faces the suction port (see, for example, Patent Document 1). The nozzle holder includes a fuel gas flow path therein, and a gas ejection nozzle is mounted and held at the downstream end of the fuel gas flow path. The nozzle holder is integrally provided with a connecting portion in which a screw hole is formed, and the connecting plate is formed with a screw hole corresponding to the screw hole of the connecting portion of the nozzle holder. Thus, the gas ejection nozzle can be attached to the suction port only by matching the screw hole of the nozzle holder with the screw hole of the connecting plate and screwing them together. At this time, since the connecting plate is provided integrally with the suction port body, if the nozzle holder and the connecting plate are screwed with high precision, the fuel gas is directed from the gas ejection nozzle toward the axis of the throat portion. A relatively large amount of primary air can be efficiently taken in with the fuel gas stream to obtain good combustion.

However, the installation work of the nozzle holder that requires high-precision screwing requires the skill of the operator. For example, if the installation work is performed with the nozzle holder tilted inadvertently, the nozzle holder In some cases, the screw hole and the screw hole of the connecting plate are displaced and the screw is fixed in an obliquely tightened state. In such an attached state, the direction of the gas ejection nozzle is deviated from the axis of the throat part, and the fuel gas cannot be ejected accurately toward the axis of the throat part, and good combustion is achieved. May not be obtained. For this reason, there is a disadvantage that the re-tightening work after the attachment is required and the manufacturing efficiency is deteriorated.
JP 2004-169971 A (FIGS. 4 and 6)

  An object of the present invention is to provide a burner device that can eliminate the inconvenience and can perform a highly accurate mounting operation of the gas ejection nozzle facing the suction port and can obtain good combustion. And

  In order to achieve the above object, the present invention has an intake port for suctioning fuel gas ejected from a gas ejection nozzle together with primary air at one end, and a cylindrical throat portion having a smaller diameter than the suction port is formed at the other end. A funnel-shaped suction port body formed in the part, a mixing pipe part in which the throat part of the suction port body is integrally connected to mix fuel gas and primary air, and a mixed gas generated in the mixing pipe part And a connecting plate for connecting the nozzle holder holding the gas jet nozzle by screwing so that the gas jet nozzle faces the suction port, integrally connected to the suction port body. In this burner apparatus, the connecting plate is integrally provided with an extending piece extending opposite to the suction port, and the gas ejection nozzle is connected to the extending piece by screwing the nozzle holder to the connecting plate. And insert the gas ejection nozzle A positioning hole for positioning the nozzle holder at the connection position of the connecting plate is provided, and the positioning hole is concentric with the throat portion and is formed in a shape that is in close contact with the entire outer periphery of the gas ejection nozzle. And

  According to the present invention, when the nozzle holder is screwed and connected to the connecting plate, the gas ejection nozzle is inserted into the positioning hole of the extension piece. Since the positioning hole is formed concentrically with the throat part, the gas jet nozzle inserted into the positioning hole is closely contacted with the positioning hole on the entire outer periphery, and inadvertent movement is restricted. Will be oriented toward the axis of the throat. As a result, the nozzle holder reliably corresponds to the screwing position of the connecting plate (that is, the screw hole formed in the nozzle holder matches the screw hole formed in the connecting plate), and diagonal tightening of the screw is prevented. Thus, the nozzle holder can be accurately screwed to the connecting plate.

  Thus, according to the present invention, the nozzle holder can be screwed and connected to the connecting plate with high precision simply by inserting the gas ejection nozzle into the positioning hole of the extending piece, and the operation is extremely easy. Yes. Moreover, even after the nozzle holder is attached to the connecting plate, the highly accurate positioning state of the gas ejection nozzle by the positioning hole of the extension piece is maintained, so that the fuel gas can be reliably fed from the gas ejection nozzle to the axis of the throat portion. A relatively large amount of primary air can be efficiently taken in along with the fuel gas flow from the intake port to obtain good combustion.

  Furthermore, in the present invention, the nozzle positioning hole is preferably formed in a cylindrical shape extending along the axis of the throat portion. Since the nozzle positioning hole is cylindrical, the contact distance between the inner peripheral surface of the nozzle positioning hole and the outer peripheral surface of the gas ejection nozzle is long, and the positioning state of the gas ejection nozzle can be firmly maintained. Thereby, the screwing connection of the nozzle holder to the connecting plate can be performed more reliably and accurately.

  The burner device 1 of this embodiment is an all primary air type used as a heat source of a hot air heater (not shown), and is attached to the burner body 2 and the upper part of the burner body 2 as shown in FIG. It is constituted by the combustion plate 3.

  The burner body 2 is integrally provided with a funnel-shaped suction port body 6 having a suction port 4 opened in a circular shape and a throat portion 5 having a smaller flow cross-sectional area than the suction port 4 on one side. Yes. The suction port body 6 is provided so that its throat portion 5 communicates with an upstream end portion of a cylindrical mixing tube portion 7 formed inside the burner body 2. A distribution chamber 8 communicating with the downstream end of the mixing tube portion 7 is formed in the upper portion of the mixing tube portion 7, and a distribution plate 10 having a plurality of through holes 9 is provided in the distribution chamber 8. The combustion plate 3 is a ceramic plate body in which a plurality of flame holes 11 are formed, and is provided horizontally above the distribution plate 10. A gas ejection nozzle 12 (see FIG. 3) faces the suction port 4 in the axial direction at the center thereof, and fuel gas is sent from the gas ejection nozzle 12. At this time, the primary air is taken in from the surroundings by the fuel gas flow, the fuel gas sucked from the suction port 4 and the primary air are mixed in the mixing pipe portion 7 and uniformly distributed in the distribution chamber 8, and the distribution plate 10 A flame is formed by the flame holes 11 of the combustion plate 3 through the through holes 9. In addition, what is shown with the code | symbol 13 is an oxygen deficiency detection burner.

  As shown in FIGS. 1 and 2, the suction port body 6 is integrally provided with a rectangular plate-shaped frame body 14 provided continuously with the edge of the suction port 4. The frame body 14 is formed by bending a metal plate punched into a predetermined shape, and is provided integrally with the suction port body 6 by welding to the peripheral portion of the suction port 4 of the suction port body 6. .

  An opening 15 that matches the suction port 4 is formed in the frame body 14, and an upper connecting tongue piece 16 that is integrally connected to the burner body 2 is provided continuously at the upper end portion thereof. A side connection tongue piece 17 and a lower connection tongue piece 18 are connected to the one side edge and the lower edge of the frame body 14 by screws to connect to a casing of a hot air heater (not shown). Yes. Further, a connecting plate 19 extending outward from the suction port 4 is integrally provided on the other side edge of the frame body 14, and the nozzle holder 20 is attached to the connecting plate 19 with screws 21 as shown in FIG. 3. Connected and fixed. The nozzle holder 20 has a gas passage 22 formed therein, and the gas ejection nozzle 12 is integrally attached to the downstream end of the gas passage 22. The connecting plate 19 is formed with a plurality of vent holes 23.

  Further, as shown in FIG. 2, the connecting plate 19 is integrally provided with an extension piece 24 that extends to face the suction port 4. A positioning hole 25 concentric with the throat portion 5 is formed in the extension piece 24. The positioning hole 25 is a so-called burring hole and is formed in a cylindrical shape extending toward the suction port 4, and its inner diameter is formed to be in close contact with the outer peripheral surface of the gas ejection nozzle 12 as shown in FIG. 3. Yes.

  As shown in FIGS. 2 and 3, the connection plate 19 is formed with a pair of screw holes 26. As shown in FIG. 3, the screw hole 26 of the connecting plate 19 is connected by the screw 21 in a state where it matches the screw hole 28 of the connecting portion 27 provided in the nozzle holder 20. Although not shown in detail, the screw hole 28 of the connecting portion 27 of the nozzle holder 20 is slightly larger in diameter than the screw hole 26 of the connecting plate 19 so that the screw 21 can be easily inserted. It is like that.

  Here, the attachment of the gas ejection nozzle 12 to the suction port body 6 will be described with reference to FIG. First, the nozzle holder 20 is placed along the inner side of the connecting plate 19 and the gas ejection nozzle 12 is inserted into the positioning hole 25 of the extension piece 24. At this time, the gas ejection nozzle 12 is smoothly inserted with its outer peripheral surface guided in sliding contact with the inner peripheral surface of the cylindrical positioning hole 25. And in the base end part of the gas ejection nozzle 12, the outer surface of the extension piece 24 contact | abuts to the edge part of the nozzle holder 20, and the gas ejection nozzle 12 will be in the state positioned with high precision. Since the gas ejection nozzle 12 is provided integrally with the nozzle holder 20, the screw hole 28 of the nozzle holder 20 and the screw hole 26 of the connecting plate 19 match when the gas ejection nozzle 12 is accurately positioned. .

  Thereafter, the nozzle holder 20 and the connecting plate 19 are connected and fixed with screws 21, so that the nozzle holder 20 and the connecting plate 19 are screwed and connected, and the gas ejection nozzle 12 is fixed at a position facing the suction port 4. At this time, the gas ejection nozzle 12 is maintained in the state of being inserted into the positioning hole 25 of the extension piece 24 not only during the screw tightening operation of the nozzle holder 20 and the connecting plate 19 but also after the screw tightening operation. The axial center S1 of the throat portion 5 and the axial center S2 of the gas ejection nozzle 12 are accurately aligned. As a result, the fuel gas ejected from the gas ejection nozzle 12 smoothly flows toward the center of the throat portion 5, and accordingly, a sufficient amount of primary air is taken in from the suction port 4 and stable and good combustion is achieved. It can be performed.

  Further, as described above, when the gas ejection nozzle 12 is attached to the suction port body 6, the screw hole 28 of the nozzle holder 20 can be obtained simply by inserting the gas ejection nozzle 12 into the positioning hole 25 of the extension piece 24. And the screw hole 26 of the connecting plate 19 are precisely matched, so that the screw 21 can be tightened very easily. Further, for example, the nozzle holder 20 does not inadvertently tilt. Thus, it is possible to reliably avoid the situation in which the screw 21 that connects the screw 19 is obliquely tightened.

  In the present embodiment, the extending piece 24 formed by cutting and raising from the connecting plate 19 is shown because the frame body 14 of the suction port body 6 is formed of a metal plate material. The piece 24 may be separated from the frame body 14, and the extended piece 24 may be integrally connected to the connecting plate 19 with high accuracy. Further, in the present embodiment, the positioning hole 25 is a so-called burring hole and is formed in a cylindrical shape extending toward the suction port 4, but although not shown, the extension piece 24 is relatively thick. If it is thick, the contact distance between the inner peripheral surface of the nozzle positioning hole and the outer peripheral surface of the gas ejection nozzle becomes longer even if the positioning hole 25 is not a burring hole, and the gas ejection nozzle 12 is positioned with high accuracy. Can do.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory sectional drawing which shows the burner apparatus of one Embodiment of this invention. Explanatory perspective view which shows the suction inlet body of the burner apparatus of this embodiment. Explanatory sectional drawing which shows the principal part of the burner apparatus of this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Burner apparatus, 4 ... Suction port, 5 ... Throat part, 6 ... Suction port body, 7 ... Mixing pipe part, 11 ... Flame hole, 12 ... Gas ejection nozzle, 19 ... Connecting plate, 20 ... Nozzle holder, 24 ... Extension piece, 25 ... positioning hole.

Claims (2)

A funnel-like suction port body formed at one end with a suction port for sucking fuel gas ejected from the gas ejection nozzle together with primary air, and having a cylindrical throat portion smaller in diameter than the suction port at the other end; A throat portion of the inlet body is integrally connected to mix a fuel tube and primary air, and a flame hole that forms a flame by the mixed gas generated in the mixing tube portion, In the burner device in which a connecting plate for connecting the nozzle holder holding the gas ejection nozzle with a screw so that the gas ejection nozzle faces the suction port is integrally connected to the suction port body,
The connecting plate is integrally provided with an extending piece that faces the suction port,
When the nozzle holder is screwed and connected to the connecting plate, the extension piece is provided with a positioning hole for inserting a gas jet nozzle and positioning the nozzle holder at the connecting position of the connecting plate via the gas jet nozzle,
The positioning hole is formed in a shape that is concentric with the throat portion and is in close contact with the entire outer periphery of the gas ejection nozzle.   The burner apparatus according to claim 1, wherein the nozzle positioning hole is formed in a cylindrical shape extending toward the suction port.

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