JP2010261629A - Burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner capable of securing proper combustion amount at a pilot flame burner port, even when an area of a main burner port is increased. <P>SOLUTION: Groove sections 18 projecting toward a fuel gas flow channel are disposed on a right plate 11 and a left plate 12 of a burner body 10 at an upper part with respect to gas injection holes 19. As flow channel resistance of a fuel gas directing to the main burner port 13 can be increased, the sufficient amount of fuel gas can be injected from the gas injection holes 19, even when the area of the main burner port 13 is increased. Thus the stable pilot flame can be formed at the pilot flame burner port 21 by supplying the sufficient amount of fuel gas to the pilot flame burner port 21 while reducing burner port load of the main burner port 13. Thus the main flame is attracted to the main burner port 13 by the pilot flame while stabilizing a burning state of the main flame, and lifting phenomenon of the main flame can be prevented. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a burner used for combustion equipment such as a gas water heater.

  2. Description of the Related Art Conventionally, a box-shaped burner body and a sleeve-fire type gas burner having sleeve-fire caps on both sides of the burner body are known (see, for example, Patent Document 1). In this sleeve fire type gas burner, a plurality of main flame openings are provided on the upper plate of the burner body, and a plurality of gas ejection holes are provided on the side plates facing each other of the burner body. The burner caps are respectively provided on the burner body with a gap from the side plate of the burner body. A sleeve flame opening is formed between the upper end of the side plate of the burner body and the upper end of the burner cap. The fuel gas flows in from below the burner body, and part of the fuel gas is ejected from the main flame opening to form the main flame, and part of the fuel gas is ejected from the gas ejection hole. The fuel gas ejected from the gas ejection holes flows upward through the gap between the side plate of the burner body and the burner cap, and is ejected from the sleeve flame opening to form a sleeve fire.

  In this sleeve fire type gas burner, the gas ejection speed from the sleeve flame outlet is slower than the gas ejection speed from the main flame opening. Thus, the main flame tends to cause a lift phenomenon in which combustion is performed away from the main flame mouth, but the main flame is attracted to the main flame mouth by the sleeve fire, and the lift phenomenon of the main flame can be suppressed.

  Another method for suppressing the main flame lift phenomenon is to increase the area of the main flame opening. By increasing the area of the main flame mouth, the gas ejection speed per unit area of the main flame mouth can be slowed and the lift phenomenon of the main flame can be suppressed.

Japanese Patent Laid-Open No. 8-200353

  However, when the area of the main flame opening is increased, the flow resistance of the fuel gas at the main flame opening is reduced, and the ratio of the fuel gas toward the main flame opening is increased. In this case, the ratio of the fuel gas ejected from the gas ejection holes decreases, and the amount of fuel gas supplied to the sleeve flame opening decreases. For this reason, there is a problem in that an appropriate amount of combustion at the sleeve flame cannot be secured, and the main flame cannot be attracted to the main flame by the sleeve fire.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a burner capable of ensuring an appropriate amount of combustion at the sleeve flame outlet while increasing the area of the main flame mouth.

  In order to achieve the above object, a burner according to claim 1 of the present invention includes an upper plate provided with a plurality of main flame openings, and a pair of side plates opposed to each other and provided with a plurality of gas ejection holes. A burner body in which a flow path of fuel gas supplied from below is formed between the pair of side plates, and a gap between the side plates and the side plate so as to cover the gas ejection holes. Each provided with a flame holding plate, a sleeve flame opening is formed between the upper end portion of the side plate and the upper end portion of the flame holding plate, the burner body is located above the gas ejection hole, A narrow portion for narrowing the flow path of the fuel gas is provided.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the narrowed portion is formed by projecting a part of the side plate toward the gas flow path. It is characterized by.

  According to a third aspect of the present invention, in addition to the structure of the second aspect of the invention, the constricted portion is provided in parallel to the flame front surface of the sleeve flame outlet, On the opposite side of the gas flow path side, the gas pressure of the gas that is formed between the narrowed portion and the flame holding plate and is ejected from the plurality of gas ejection holes is evenly distributed in the parallel direction. A pressure equalizing chamber is provided.

  In the burner according to the first aspect of the present invention, the burner body has a narrowed portion for narrowing the flow path of the fuel gas above the gas ejection hole, so that the flow resistance of the fuel gas toward the main flame opening is reduced. Can be bigger. Therefore, a sufficient amount of fuel gas can be ejected from the gas ejection holes even if the flame area of the main flame mouth is increased and the flame load is reduced. Even if the area of the main flame opening is increased, a sufficient amount of fuel gas can be supplied to the sleeve flame outlet, so that an appropriate amount of combustion can be secured in the sleeve flame outlet while increasing the area of the main flame opening.

  Further, in the burner according to claim 2, in addition to the effect of the invention according to claim 1, the narrowed portion is formed by projecting a part of the side plate toward the gas flow path. The constriction can be formed easily and inexpensively without increasing the thickness.

  In addition to the effect of the invention according to claim 2, the burner according to claim 3 is configured such that the gas pressure of the gas ejected from the gas ejection hole is set on the outer side of the narrowed portion, and the flame outlet of the sleeve flame outlet. A pressure equalizing chamber is formed that is uniform in a direction parallel to the surface. Since the ejected gas reaches the sleeve flame outlet via the pressure equalizing chamber, the ejected gas is evenly supplied to the sleeve flame outlet. Thereby, a stable sleeve fire can be formed in the sleeve flame outlet. Therefore, the main flame can be reliably attracted to the main flame mouth by the sleeve fire. Therefore, the lift phenomenon and vibration combustion in the main flame can be prevented. Further, since the pressure equalizing chamber is provided outside the constricted portion, the pressure equalizing chamber can be provided while maintaining the size of the burner.

1 is a perspective view of a gas burner 1. FIG. 1 is an exploded perspective view of a gas burner 1. FIG. It is the II sectional view taken on the line in FIG.

  Hereinafter, the gas burner 1 which is one Embodiment of this invention is demonstrated with reference to drawings. In the following description, the lower left in FIG. 1 is the front of the gas burner 1, the upper right is the rear of the gas burner 1, the lower right is the right direction of the gas burner 1, and the upper left is the left direction of the gas burner 1. The gas burner 1 of this embodiment is used for combustion equipment such as a gas water heater. A plurality of gas burners 1 are used side by side in parallel with the combustion equipment, or are used alone.

  As shown in FIGS. 1 and 2, the gas burner 1 of this embodiment is formed of a burner body 10 and a burner cap 20 attached to the upper part of the burner body 10.

  First, the structure of the burner body 10 will be described with reference to FIGS. 1 and 2. The burner body 10 is formed by bending a single stainless steel plate formed into a concavo-convex shape by pressing. The burner body 10 includes a right plate 11, a left plate 12 (see FIG. 3) that faces the right plate 11, and an upper plate 31 that is provided between the upper end portion of the right plate 11 and the upper end portion of the left plate 12. Is a thin box having a substantially rectangular shape in side view.

  As shown in FIGS. 1 and 2, the right plate 11 is provided with a bulging portion 111 bulging in the right direction of the burner body 10. The bulging portion 111 is provided in the vicinity of the lower end portion of the right plate 11 and is provided above the mixing tube forming portion 161 and the mixing tube forming portion 161 provided substantially parallel to the lower end portion, A distribution chamber forming portion 171 spreading in a substantially inverted triangular shape when viewed from the side, and a gas supply chamber forming portion 351 (see FIG. 2) provided above the distribution chamber forming portion 171 and having a substantially rectangular shape when viewed from the side. Yes.

  When the burner body 10 is viewed from the front, the left plate 12 shown in FIG. 3 has a symmetrical shape with respect to the right plate 11 except for its peripheral end. That is, the left plate 12 is also provided with a bulging portion (not shown) that bulges in the left direction of the gas burner 1 at a position facing the bulging portion 111 of the right plate 11. The right plate 11 and the left plate 12 are caulked and fixed at the front end portion, the rear end portion, and the lower end portion of the burner body 10 except for the gas supply port 15 provided at the lower portion of the front end portion. The gas supply port 15 opens toward the front of the burner body 10.

  In the gap between the bulging portion 111 of the right plate 11 and the bulging portion (not shown) of the left plate 12, a gas flow portion 14 through which fuel gas flows is formed.

  The gas distribution unit 14 communicates with the gas distribution unit 16 that communicates with the gas supply port 15, the gas distribution unit 17 that communicates with the gas mixing unit 16, and the gas distribution unit 17 in order from the upstream side in the direction in which the fuel gas flows. And a gas supply unit 35. The gas mixing unit 16 is provided substantially parallel to the lower end of the burner body 10. The gas mixing unit 16 is bent upward in the vicinity of the downstream end.

  The gas distribution part 17 communicates with the downstream end of the gas mixing part 16 and has a substantially inverted triangle in side view so that the cross section of the flow path of the fuel gas extends in the front-rear direction of the burner body 10 toward the upper side of the burner body 10. Spread in shape. The gas supply unit 35 communicates with the downstream end of the gas distribution unit 17 and is formed over the longitudinal direction (front-rear direction) of the burner body 10.

  Groove portions 18 extending in the front-rear direction (longitudinal direction) are formed in the upper portions of the right plate 11 and the left plate 12 forming the gas supply portion 35 and covered with the burner cap 20, as shown in FIG. Has been. The groove 18 protrudes toward the inside of the gas supply unit 35 and extends over the entire area in the front-rear direction of the gas supply unit 35. In the portion sandwiched between the groove portions 18, the cross section of the fuel gas flow path is narrowed in the left-right direction. A plurality of gas ejection holes 19 are arranged in the front-rear direction below the groove 18. The opening shape of the gas ejection hole 19 is circular.

  An upper plate 31 is disposed on the upper part of the gas supply unit 35, and a plurality of main flame ports 13 are provided on the upper plate 31 at predetermined intervals in the front-rear direction. Each main flame port 13 is formed in a slit shape that is long in the left-right direction of the burner body 10. The gas supply unit 35 communicates with the outside, and the fuel gas that has flowed through the gas circulation unit 14 is ejected from the main flame port 13 and burned. By doing so, the main flame is formed.

  Next, the structure of the burner cap 20 will be described with reference to FIG. The burner cap 20 is formed by bending a single stainless steel plate provided with an uneven shape and a through hole by pressing. The burner cap 20 includes a plate-shaped right cap 41 having a substantially rectangular shape in side view and having a length in the front-rear direction, and a plate-shaped left cap 42 having a substantially rectangular shape in side view facing the right cap 41 with a gap. Between the upper end portion of the right cap 41 and the upper end portion of the left cap 42, connecting pieces 43 having a band shape in plan view are provided at four locations. As shown in FIG. 3, stepped portions 23 that are recessed inside the burner cap 20 are provided on the lower ends of the right cap 41 and the left cap 42.

  In the burner cap 20 having the above structure, as shown in FIG. 2, the right cap 41 covers the upper part of the right plate 11 from the right side, and the left cap 42 covers the upper part of the left plate 12 (see FIG. 3) from the left side. And attached to the upper part of the burner body 10. The step portion 23 of the right cap 41 is spot-welded in contact with the outer surface of the right plate 11 below the gas ejection hole 19. The step 23 of the left cap 42 is spot-welded in contact with the outer surface of the left plate 12 below the gas ejection hole 19. 1 is configured by caulking and fixing the burner cap 20 to the burner body 10 at the front end portion and the rear end portion of the burner cap 20.

  As shown in FIG. 3, when the burner cap 20 is attached to the burner body 10, gaps are formed between the right cap 41 and the right plate 11 and between the left cap 42 and the left plate 12, respectively. Has been. The ejection gas circulation part 25 is formed by the formed gap. The jet gas circulation section 25 functions as a gas flow path for fuel gas jetted from the gas jet holes 19 (hereinafter referred to as jet gas). The jet gas circulation part 25 has an upstream part 32, a pressure equalization chamber 22, and a downstream part 33 from the upstream side to the downstream side in the direction in which the jet gas flows (from the lower side to the upper side in FIG. 3). I have. The upstream part 32 is located in the lower part of the jet gas circulation part 25.

  The pressure equalizing chamber 22 is located outside the groove 18 described above. In the pressure equalizing chamber 22, compared to the upstream portion 32, the gas flow path cross section of the jet gas is wider in the left-right direction.

  The gas channel cross-sectional area of the downstream portion 33 is substantially the same as the gas channel cross-sectional area of the upstream portion 32. A sleeve flame port 21 is formed at the upper end of the downstream portion 33. That is, the sleeve flame opening 21 is formed in the gap between the upper end portion of the right cap 41 and the upper end portion of the right plate 11 and the gap between the upper end portion of the left cap 42 and the upper end portion of the left plate 12. The erupted gas that has flowed through the erupted gas circulation part 25 is ejected from the sleeve flame outlet 21 and burns to form a squirt.

  Next, the flow of the fuel gas in the gas burner 1 having the above structure will be described with reference to FIGS. A gas jet nozzle (not shown) of the water heater faces the gas supply port 15 in the axial direction at the center thereof. Fuel gas is fed into the gas supply port 15 from the gas ejection nozzle. At this time, primary air is taken in from the surroundings by the fuel gas flow, and fuel gas and primary air are sent into the gas supply port 15. The fed fuel gas and primary air are supplied to the gas mixing unit 16. The fuel gas and primary air supplied to the gas mixing unit 16 are mixed by the gas mixing unit 16 and supplied to the gas distribution unit 17. In the gas distribution part 17, the fuel gas is supplied to the gas supply part 35 while being diffused in the front-rear direction of the burner body 10.

  As shown in FIG. 3, part of the fuel gas supplied to the gas supply unit 35 flows upward and reaches the main flame mouth 13 formed in the upper plate 31 (see FIG. 1). Forms a main flame. Part of the fuel gas is ejected from gas ejection holes 19 formed in the right plate 11 and the left plate 12. The ejected gas ejected from the gas ejection holes 19 flows upward through the ejected gas circulation part 25 to reach the sleeve flame opening 21, and forms a sleeve fire at the sleeve flame opening 21.

  The flow of the fuel gas toward the main flame opening 13 will be described in detail with reference to FIG. The fuel gas supplied from the gas distribution unit 17 to the gas supply unit 35 reaches the main flame port 13 via a portion sandwiched between the groove portions 18. The cross-sectional area of the gas flow path of the fuel gas flowing toward the main flame opening 13 becomes narrow at the portion sandwiched between the groove portions 18. Thereby, the flow path resistance of the gas flow path of the fuel gas flowing toward the main flame opening 13 is increased.

  When the flow resistance of the gas flow path of the fuel gas flowing toward the main flame port 13 increases, the fuel gas supplied to the gas supply unit 35 becomes difficult to flow toward the main flame port 13. Therefore, the ratio of the fuel gas flowing toward the main flame opening 13 in the fuel gas supplied to the gas supply unit 35 decreases, and the ratio of the fuel gas ejected from the gas ejection holes 19 increases.

  Therefore, even when the area of the main flame outlet 13 is increased and the flame load at the main flame outlet 13 (flame unit area, amount of combustion per unit time) is reduced, the fuel gas ejected from the gas ejection holes 19 Can be secured.

  In general, when the area of the main flame opening 13 is increased, the flow resistance at the main flame opening 13 is reduced and the ratio of the fuel gas toward the main flame opening 13 is increased. Therefore, the fuel gas ejected from the gas ejection hole 19 Will be less. In the present embodiment, since the flow resistance of the fuel gas toward the main flame outlet 13 can be secured, a sufficient amount of fuel gas can be supplied to the sleeve flame outlet 21 while reducing the flame load at the main flame mouth 13, A stable fire can be formed. As a result, the main flame is attracted to the main flame opening 13 by the stable sleeve fire while the combustion state of the main flame is stabilized, and the lift phenomenon of the main flame can be prevented.

  Next, the flow of fuel gas (hereinafter referred to as jet gas) toward the sleeve flame port 21 will be described in detail with reference to FIG. In general, the ejection speed of the ejection gas ejected from the gas ejection holes 19 tends to increase as the gas ejection holes 19 become closer to the gas mixing section 16. Therefore, in the vicinity of the gas ejection hole 19, the gas pressure of the ejection gas is not uniform in the front-rear direction (the depth direction in FIG. 3).

  The jet gas flows upward in the upstream part 32 of the jet gas circulation part 25 and flows into the pressure equalizing chamber 22. The jet gas circulation part 25 once widens in the left-right direction in the pressure equalizing chamber 22 and then becomes narrow again. In the pressure equalizing chamber 22, the flow of the jet gas is disturbed by the change in the cross-sectional area of the jet gas flow path. At this time, the jet gas not only flows in the upward direction, but also diffuses in the front-back direction as a pressure gradient in the front-back direction of the jet gas becomes a driving force. That is, the jet gas moves from a high pressure to a low pressure in the front-rear direction so that the pressure gradient in the front-rear direction becomes zero in the pressure equalization chamber 22. Thus, in the pressure equalizing chamber 22, the gas pressure of the ejected gas is made uniform in the front-rear direction.

  The jet gas flows into the downstream portion 33 from the pressure equalizing chamber 22. Since the gas pressure of the jet gas flowing into the downstream portion 33 is uniform in the front-rear direction, the flow velocity of the jet gas is uniform in the front-rear direction in the downstream portion 33. The ejected gas flows upward through the downstream portion 33 and is ejected from the sleeve flame outlet 21.

  Since the ejection speed of the ejection gas at the sleeve flame 21 is uniform in the front-rear direction, a stable sleeve fire can be formed at the sleeve flame 21. By forming a stable flaming in the sleeve flame 21, the main flame can be reliably attracted to the main flame 13 by the flaming and a normal combustion state can be maintained.

  As described above, according to the gas burner 1 of the present embodiment, the right plate 11 and the left plate 12 of the burner body 10 are provided with the groove portion 18 above the gas ejection hole 19, so that the main flame outlet 13. It is possible to increase the flow resistance of the fuel gas toward Therefore, a sufficient amount of fuel gas can be ejected from the gas ejection holes 19 even if the flame opening area is increased in the main flame outlet 13 and the flame load is reduced. Therefore, a sufficient amount of fuel gas can be supplied to the sleeve flame 21 while reducing the flame load on the main flame mouth 13, and the combustion state of the sleeve flame can be stabilized. Thereby, the main flame is attracted to the main flame opening 13 by the sleeve fire while stabilizing the combustion state of the main flame, and the lift phenomenon of the main flame can be reliably prevented.

  Further, the gas ejected from the gas ejection hole 19 reaches the sleeve flame port 21 via the pressure equalizing chamber 22. The gas pressure in the pressure equalizing chamber 22 is made uniform in the front-rear direction. Therefore, the ejection speed of the ejection gas at the sleeve flame port 21 can be made uniform in the front-rear direction. Thereby, since the combustion state of the sleeve fire in the sleeve flame outlet 21 can be stabilized, the main flame can be reliably attracted to the main flame mouth 13 by the sleeve fire. Therefore, the main flame lift phenomenon and vibration combustion can be prevented.

  Moreover, since the groove part 18 is formed by making the right board 11 and the left board 12 protrude toward the inner side of the gas supply part 35, the groove part 18 can be formed by press work. Therefore, the groove portion 18 can be formed easily and inexpensively without increasing the manufacturing process and the number of parts of the burner body 10 compared to the conventional product.

  Further, since the pressure equalizing chamber 22 is formed outside the groove portion 18, the flow path of the jet gas can be expanded inside instead of expanding outward in the left-right direction. Therefore, the flow passage cross-sectional area of the ejected gas can be increased while maintaining the dimensions of the gas burner 1.

  In the above description, the upper plate 31 corresponds to the “upper plate” of the present invention. The right plate 11 and the left plate 12 correspond to the “side plate” of the present invention. The right cap 41 and the left cap 42 correspond to the “flame retaining plate” of the present invention. The groove portions 18 and 18 provided in the right plate 11 and the left plate 12 correspond to the “stenosis portion” of the present invention.

  It goes without saying that the above embodiment can be variously modified without departing from the scope of the invention. For example, the shape of the main flame opening 13 and the shape of the gas ejection holes 19 are not limited to the embodiment. In the present embodiment, the groove 18 that protrudes toward the fuel gas flow path is provided on the right plate 11 and the left plate 12 to narrow the fuel gas flow path. However, for example, the groove 18 is not provided. The fuel gas flow path may be narrowed by disposing another member in the middle of the flow path formed between the right plate 11 and the left plate 12.

DESCRIPTION OF SYMBOLS 1 Gas burner 10 Burner main body 11 Right board 12 Left board 13 Main flame opening 14 Gas distribution part 16 Gas mixing part 17 Gas distribution part 18 Groove part 19 Gas ejection hole 20 Burner cap 21 Sleeve flame outlet 22 Equal pressure chamber 25 Ejection gas circulation part 31 Upper plate 35 Gas supply section

Claims (3)

A flow path for fuel gas supplied from below between the pair of side plates, comprising an upper plate provided with a plurality of main flame openings and a pair of side plates facing each other and provided with a plurality of gas ejection holes, respectively. A burner body formed with,
A flame-holding plate provided on the outer surface of the side plate with a gap from the side plate so as to cover the gas ejection hole,
A sleeve flame opening is formed between the upper end portion of the side plate and the upper end portion of the flame holding plate,
The burner body is provided with a narrowed portion for narrowing a flow path of the fuel gas above the gas ejection hole.   The burner according to claim 1, wherein the narrowed portion is formed by projecting a part of the side plate toward the gas flow path. The narrowed portion is provided in parallel to the flame mouth surface of the sleeve flame mouth,
On the side opposite to the gas flow path side of the narrowed portion, the gas pressure of the gas ejected from the plurality of gas jet holes formed between the narrowed portion and the flame holding plate is set to the parallel pressure. The burner according to claim 2, wherein a pressure equalizing chamber is provided which is uniform in the direction.

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