WO2008088198A1

WO2008088198A1 - Burner for gas boiler

Info

Publication number: WO2008088198A1
Application number: PCT/KR2008/000339
Authority: WO
Inventors: Choong Hee Lee
Original assignee: Kyungdong Navien Co., Ltd.
Priority date: 2007-01-19
Filing date: 2008-01-18
Publication date: 2008-07-24
Also published as: KR100808318B1; JP5380304B2; US20100294214A1; CN101611263A; JP2010516988A; EP2115355A1; CN101611263B

Abstract

The present invention relates to a burner for gas boiler that produces stable combustion without lifting of flame by stably guiding gas and primary and secondary air to the inside of an upper plate and having a first slope having main fire holes to improve efficiency of ignition and combustion in a burner main body, in which a gas mixture channel is formed by a guide plate disposed at the center of the burner main bodyburner bodyor stable mixing of gas and the primary air.

Description

Description BURNER FOR GAS BOILER

Technical Field

[1] The present invention relates to a burner for gas boilers that produce stable combustion without generating the lifting of flame by stably guiding gas and primary air to the inside of an upper plate and having a first slope having main fire holes to improve efficiency of ignition and combustion in a burner main body. Background Art

[2] In general, burners used in gas boilers or oil boilers are devices that appropriately mix gas or oil with air and then produces combustion and classified into a red flame burner, a Bunsen burner, and a premix gas burner, according to the mixing ratio of primary and secondary air.

[3] The red flame burner is commonly used for gun-type burners in which fuel is injected and combustion is produced while air is mixed with the fuel. The Bunsen type burner, which is classified into a Bunsen burner or a semi-Bunsen burner, produces combustion, mixing fuel that is injected with primary air, and then additional secondary air is provided to produce practically complete combustion.

[4] The premix burner produces combustion only with primary air and uses an impeller to improve efficiency in mixing fuel with air.

[5] In the Bunsen burner having the above configuration in the related art, a circular burner generally has one venturi pipe and one nozzle unit. Therefore, it was difficult to produce combustion when gas pressure that is supplied decreases, such as rush hour, or the gas decreases in volume due to low temperature of the external air.

[6] Further, because fire holes are formed at the side of the burner cover, lifting of flame was generated when the second air was supplied perpendicular to the fire holes, causing a bad combustion of the flames above the fire holes due to the lack of second air, and the upper plate of the burner was overheated due to the concentration of heat, thereby reducing the burner's life.

[7] Further, an individual venturi pipe is attached to the side of the burner, such that the entire size of burner was increased. In a bar burner, fire holes are formed through an upper horizontal surface of the burner, such that the flames became long due to the lack of second air, generating CO, NOx, etc. In addition, a plurality of separate burners is provided, thereby increasing material costs and manufacturing cost. Accordingly countermeasures are needed. Disclosure of Invention Technical Problem [8] The present invention is designed to overcome the above problems, and it is an object of the invention to provide a burner for a gas boiler that prevents lifting of flame through the main fire holes of the burner main body and stably produces combustion with the highest performance of combustion. Technical Solution

[9] In order to achieve the objects, a burner for gas boiler according to the invention includes: a casing that has a space inside; a fan that is connected to the lower side of the casing and supplies the external air into the casing; a nozzle unit that is connected to a side of the casing and injects gas at high speed through the front end disposed inside the casing; a burner main body that is disposed from a predetermined distance from the bottom of the casing and has a burner upper plate having main fire holes formed at regular distances at both sides in the longitudinal direction of a burner frame and a burner lower plate connected to the lower side of the burner upper plate and having a polygonal cross section; a venturi plate that is disposed on an open side of the burner main body, at the front of the nozzle unit, and has a venturi hole allowing primary air mixed with the gas injected from the nozzle unit to flow into the burner main body; an end plate that is disposed on the other side of the burner main body, facing the venturi plate; and a guide plate that is horizontally disposed at the center inside the burner main body and guides the gas mixture of the gas and the primary air generated by the nozzle unit to the upper portion of the burner main body.

[10] It is preferable that the burner upper plate and the burner lower plate are made of different materials. That is, it is preferable that the burner upper plate is made of stainless steel and the burner lower plate is made of steel.

[11] The burner upper plate has: a first horizontal surface having ignition holes spaced part from each other to allow ignition to transfer to the main fire holes formed through the burner upper plate; and first slopes that are each integrally formed with the first horizontal surface in the longitudinal direction, and extend downward from the first horizontal surface at a predetermined angle, while the end is bent downward. Further, the burner lower plate has: second slopes that extend inside and downward from the lower first slopes; and a second horizontal surface that is horizontally and integrally formed with the second slopes.

[12] The main fire holes are formed through the first slopes of the burner upper plate.

[13] It is preferable that the first slopes are inclined at an angle between 40° to 50° to minimize lifting of flame through the main fire holes.

[14] It is preferable that the guide plate is positioned such that one end is in contact with the venturi plate and the other end is spaced apart from the end plate to allow the primary air supplied from the nozzle unit and the fan to smoothly flow to the burner upper plate.

[15] At least one or more burner bodies are provided in the casing.

[16] A secondary air diffusion plate, of which one end is connected to the casing and the burner main body, horizontally extending toward the nozzle unit and the other end has a bending wall bending upward and having fixing holes where the venturi hole of the venturi plate in inserted and fixed, is disposed under the burner main body, and A plurality of secondary air-through holes are formed through the secondary air diffusion plate.

Advantageous Effects

[17] As described above, a burner for gas boiler according to the invention can replace existing circular burners or instantaneous bar type burners, improve the flame holding effect by forming main fire holes at an angle, and maintain the fire by constantly supplying secondary air between the main fire holes. Further, it is possible to achieve an environment-friendly boiler by reducing generation of CO, NOx, etc., because the performance of combustion is considerably improved. Furthermore, since the upper plate and lower plate of the burner main body can be made of different materials, the cost is reduced, and it is possible to reduce the width of the burner by reducing the length of the flame of the burner.

[18] In addition, the entire size of the boiler is reduced, such that it is possible to obtain additional effects in transport, installation, etc. Brief Description of the Drawings

[19] FIG. 1 is a view illustrating the configuration of a burner for a gas boiler according to the invention.

[20] FIGS. 2 to 4 are views illustrating the operation of a burner for a gas boiler according to the invention. Mode for the Invention

[21] Embodiments of a burner for a gas boiler according to the invention, having the above configuration, are described hereafter with reference to the accompanying drawings.

[22] FIG. 1 is a view illustrating the configuration of a burner for a gas boiler according to the invention and FIGS. 2 to 4 are views illustrating the operation of a burner for a gas boiler according to the invention.

[23] Referring to FIG. 1, a burner includes: a casing 10 that has a space inside; a fan 20 that is connected to the lower side of the casing 10 and supplies the external air into the casing 10; a nozzle unit 30 that is connected to a side of the casing 10 and injects gas at high speed through the front end disposed inside the casing 10; and a burner main body 100 that is disposed from a predetermined distance from the bottom of the casing 10 and has a burner upper plate 110 having main fire holes 112 formed at regular distances at both sides in the longitudinal direction of a burner body 101 and a burner lower plate 120 connected to the lower side of the burner upper plate 110 and having a polygonal cross section.

[24] The burner further includes: a venturi plate 200 that is disposed on an open side of the burner main body 100, at the front of the nozzle unit 30, and has a venturi hole 210 allowing primary air mixed with the gas injected from the nozzle unit 30 to flow into the burner main body 100; an end plate 300 that is disposed on the other side of the burner main body 100, facing the venturi plate 200; and a guide plate 400 that is horizontally disposed at the center inside the burner main body 100 and guides the gas mixture of the gas and the primary air generated by the nozzle unit 30 to the upper portion of the burner main body 100.

[25] It is preferable that the burner upper plate 110 and the burner lower plate 120 are made of different materials. That is, the burner upper plate 110 is preferably made of stainless steel and the burner lower plate 120 is preferably made of steel.

[26] The burner upper plate 110 has a first horizontal surface 114 having ignition holes

113' spaced part from each other to allow for ignition transfer to the main fire holes 112 formed through the burner upper plate 110; and first slopes 116 that are each integrally formed with the first horizontal surface 114 in the longitudinal direction, extend downward from the first horizontal surface 114 at a predetermined angle, while the end is bent downward. The burner lower plate 120 has second slopes 122 that extend inside and downward from the lower first slopes 116 and a second horizontal surface 124 that is horizontally and integrally formed with the second slopes 122.

[27] The main fire holes 112 are formed through the first slopes 116 of the burner upper plate 110.

[28] The first slopes 116 are inclined at a predetermined inclination angle to minimize lifting of flame through the main fire holes 112, preferably between 40° to 50°.

[29] It is preferable to position the guide plate 400 such that one end is in contact with the venturi plate 200 and the other end is spaced apart from the end plate 300 to allow the primary air supplied from the nozzle unit 30 and the fan 20 to smoothly flow to the burner upper plate 110.

[30] It is characterized in that at least one or more burner bodies 100 may be provided in the casing 10.

[31] A secondary air diffusion plate 500, of which one end is connected to the casing 10 and the burner main body 100 and the other end has a bending wall 510 bending upward and having fixing holes 512 where the venturi hole 210 of the venturi plate 200 in inserted and fixed, is disposed under the burner main body 100. A plurality of secondary air-through holes 520 are formed through the secondary air diffusion plate 500. The secondary air-through holes 520 are disposed separately and outside from the second horizontal surface 124 of the burner main body 100 to supply the secondary air generated by the fan 20 to the outside of the burner main body 100.

[32] The operation of a burner for a gas boiler having the above configuration is described hereafter with reference to the accompanying drawings.

[33] Referring to FIGS. 2 and 3, a heat exchanger 1 including a water container (not shown) receiving water and a hot water coil (not shown) is disposed over the burner main body 100. Fuel supplied from a fuel supplier (not shown) is injected into the venturi hole 210 through the nozzle unit 30, in which as the fuel injected from the nozzle ends of the nozzle unit 30 passes through the venturi hole 210 of the venturi plate 200, gas mixture of the fuel and primary air around the nozzle unit 30 is supplied into the burner main body 100 in the direction of the arrows.

[34] The guide plate 400 allows the primary air mixed with the fuel supplied through the nozzle unit 30 to be sufficiently mixed while flowing from the position A to B, and stably guides the gas mixture inside the burner upper plate 110 (see FIG. 1).

[35] Further, primary air and secondary air for combustion in the burner is supplied from the fan 20 to the secondary diffusion plate 500 and the inlet of the venturi plate 200, through the bottom of the casing 10.

[36] Since the secondary air diffusion plate 500 has secondary air-through holes 520, the primary air supplied from the fan 20 is simultaneously supplied to the outside of the burner main body 100.

[37] Referring to FIGS. 3 and 4, the primary air supplied inside the burner upper plate

110 through the guide plate 400 is ignited through the ignition hole 113 of the first horizontal surface 114 (see FIG. 1) and is also ignited upon being guided to the main fire holes 112 of the first slopes 116.

[38] Further, ignition is produced around the main fire holes 112 at the other end of the burner upper plate 110 through the ignition hole 113' at the other side of the first horizontal surface 114, and consequently ignition is produced through the whole main fire holes 112 as shown in FIG. 4.

[39] That is, the primary air mixed with the fuel by the nozzle unit 30 flows inside the upper plate 110 through the guide plate 400 of the burner main body 100 and, at the same time, the secondary air is supplied from the fan 20 to the outside of the burner main body 100 simultaneously with the primary air, such that ignition is produced through the main fire holes 112.

[40] Since the burner upper plate 110 of the burner main body 100 is made of stainless steel, the heat resistance is improved. Further, since the first slopes 116 have an inclination angle between 40° to 50°, the lifting of flame through the main fire holes 112 are prevented and the flames are constantly maintained in stable state. [41] Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention.

Industrial Applicability [42] The present invention provides a burner for a gas boiler that produces stable combustion with the highest performance of combustion, without generating the lifting of flame through the main fire holes of a burner main body.

Claims

[ 1 ] A burner for gas boiler comprising: a casing that has a space inside; a fan that is connected to the lower side of the casing and supplies the external air into the casing; a nozzle unit that is connected to a side of the casing and injects gas at high speed through the front end disposed inside the casing; a burner main body that is disposed from a predetermined distance from the bottom of the casing and has a burner upper plate having main fire holes formed at regular distances at both sides in the longitudinal direction of a burner body and a burner lower plate connected to the lower side of the burner upper plate and having a polygonal cross section; a venturi plate that is disposed on an open side of the burner main body, at the front of the nozzle unit, and has a venturi hole allowing primary air mixed with the gas injected from the nozzle unit to flow into the burner main body; an end plate that is disposed on the other side of the burner main body, facing the venturi plate; and a guide plate that is horizontally disposed at the center inside the burner main body and guides the gas mixture of the gas and the primary air generated by the nozzle unit to the upper portion of the burner main body.

[2] The burner according to claim 1, wherein the burner upper plate and the burner lower plate are made of different materials.

[3] The burner according to claim 1, wherein the burner upper plate has: a first horizontal surface having ignition holes spaced part from each other to allow ignition to transfer to the main fire holes formed through the burner upper plate; and first slopes that are each integrally formed with the first horizontal surface in the longitudinal direction, and extend downward from the first horizontal surface at a predetermined angle, while the end is bent downward, and the burner lower plate has: second slopes that extend inside and downward from the lower first slopes; and a second horizontal surface that is horizontally and integrally formed with the second slopes.

[4] The burner according to claim 3, wherein the main fire holes are formed through the first slopes of the burner upper plate.

[5] The burner according to claim 3, wherein the first slopes are inclined at an angle between 40° to 50° to minimize lifting of flame through the main fire holes.

[6] The burner according to claim 1, wherein the guide plate is positioned such that one end is in contact with the venturi plate and the other end is spaced apart from the end plate to allow the primary air supplied from the nozzle unit and the fan to smoothly flow to the burner upper plate.

[7] The burner according to claim 1, wherein at least one or more burner bodies are provided in the casing.

[8] The burner according to claim 1, wherein a secondary air diffusion plate, of which one end is connected to the casing and the burner main body, horizontally extending toward the nozzle unit and the other end has a bending wall bending upward and having fixing holes where the venturi hole of the venturi plate in inserted and fixed, is disposed under the burner main body, and a plurality of secondary air-through holes are formed through the secondary air diffusion plate.