AU2015354930B2

AU2015354930B2 - Rich lean combustion apparatus

Info

Publication number: AU2015354930B2
Application number: AU2015354930A
Authority: AU
Inventors: Bongil Park; Min Suk Shin
Original assignee: Kyungdong Navien Co Ltd
Current assignee: Kyungdong Navien Co Ltd
Priority date: 2014-11-25
Filing date: 2015-11-24
Publication date: 2018-11-15
Anticipated expiration: 2035-11-24
Also published as: KR101562253B1; CN107110497A; AU2015354930A1; WO2016085237A1; CN107110497B

Abstract

The rich lean combustion apparatus according to the present invention comprises: a first plate and a second plate which are provided to face each other, and between which a rich mixer flow path is provided so that a rich mixer flows through the rich mixer flow path; a third plate which is provided so that a lean mixer flows through a lean mixer flow path which is formed between the second plate and the third plate; a first burner port member for combusting the rich mixer; and a second burner port member for combusting the lean mixer, wherein the rich mixer flow path comprises a plurality of first rich mixer flow paths which are disposed in the upper portion of a distribution hole to be spaced apart from one another by a predetermined distance, and a second rich mixer flow path which is formed between the first rich mixer flow path and the first burner port member; a blocking unit is provided on both sides of the first rich mixer flow path to block the flow of the mixer; and a blocking protrusion unit is formed in the blocking unit by transforming a part of the first plate and the second plate, which have a plane shape.

Description

[DESCRIPTION] [Invention Title]

RICH LEAN COMBUSTION APPARATUS

[Technical Field]

The present disclosure relates to a rich lean combustion apparatus, and more particularly, to a rich lean combustion apparatus capable of reducing a generation amount of NOx by simultaneously causing a rich combustion and a lean combustion at a pair of burner ports adjacent to each other, and further uniformly supplying fuel and air, which are required for a combustion, to the burner ports.

[Background Art]

Generally, a combustion method of gaseous fuel includes a premixed combustion in which gaseous fuel and combustion air are premixed and then supplied to a combustion chamber, a diffusion combustion in which fuel and air are separately supplied, and a partially premixed combustion which is a hybrid between the premixed combustion and the diffusion combustion.

The partially premixed combustion refers to a combustion performed through a Bunsen burner, and the Bunsen burner premixes and supplies primary air, which is some portion of air being supplied, with fuel, and separately supplies secondary air to a flame generation portion, thereby inducing a complete combustion. With advantages of flame stability and low generation possibility of a backfire phenomenon and the like, the Bunsen burner is mainly employed in a combustion apparatus including a conventional gas boiler for home use and the like.

However, since flame of a burner is long, a flame temperature is high, and further an amount of air required for a combustion is excessively needed more than a theoretical amount of air due to a structure of the Bunsen burner, heat loss is large due to exhaust gas of a high temperature and exhaust amounts of NOx and CO are large such that the Bunsen burner has a structural limitation to the efficiency maximization and pollutant reduction of a combustion apparatus.

As one of combustion methods for reducing such a generation amount of NOx, a rich lean combustion is known in the related art.

Forming simultaneously a rich combustion having a low excess air ratio and a lean combustion having a high excess air ratio by avoiding a condition in which an excess air ratio between fuel and air at a highest flame temperature in a premixed combustion is 1, the rich lean combustion serves to drop a flame temperature to reduce a generation amount of NOx, and further to enable flame resulting from the rich combustion to stabilize an instability phenomenon such as a flame fluttering and the like which may occur while the lean combustion takes place.

An example of a combustion apparatus of such a rich lean combustion method is disclosed in Korean Registered Patent No. 965277.

However, there are problems in that the combustion apparatus disclosed in

Korean Registered Patent No. 965277 is provided with nozzles respectively configured to supply a rich mixture and a lean mixture so that a structure thereof is complicated due to a plurality of components and air is not uniformly supplied since some portion of air supplied from an air blower is supplied through holes that are formed at a partition plate.

[Disclosure] [Technical Problem]

Therefore, to address the problems described above, an object of the present disclosure is to provide a rich lean combustion apparatus capable of respectively providing a rich mixture and a lean mixture with only a single nozzle and uniformly supplying air provided from an air blower.

Another object of the present disclosure is to provide a rich lean combustion apparatus capable of implementing a desired mixture by enabling each of plates, which configure a burner body, to come into contact with one another and to be blocked, thereby preventing a leak from generating at a portion at which a mixture is blocked to flow.

Still another object of the present disclosure is to provide a rich lean combustion apparatus capable of uniformly maintaining a gap between components through a simplified configuration upon coupling a plate, which configures a burner body, to a burner port member.

[Technical Solution]

To address the problems described above, a rich lean combustion apparatus of the present disclosure includes a first plate 110 and a second plate 120 provided to face each other to enable a rich mixture to flow through rich mixture flow paths 1731 and 173-2 between the first plate 110 and the second plate 120; a third plate 130 provided to enable a lean mixture to flow through a lean mixture flow path 176 formed between the second plate 120 and the third plate 130; a first burner port member 140 configured to cause the rich mixture to combust; and a second burner port member 150 configured to cause the lean mixture to combust, wherein a mixture inlet 161 through which some portion of air supplied from an air blower 300 and fuel gas injected from a nozzle 710 are introduced, a mixture flow path introducer 171 and a mixture flow path diffuser 172 configured to enable the rich mixture, which flows in through the mixture inlet 161, to flow to a rich mixture flow path 173, an air inlet 162 through which the remaining of the air supplied from the air blower 300 is introduced, and an air flow path introducer 174 configured to enable the air, which flows in through the air inlet 162, to flow are formed between the first plate 110 and the second plate 120, at the second plate 120, a plurality of air through-holes 121 are formed to penetrate the second plate 120 to enable the air of the air flow path introducer 174 to be discharged to an air flow path 175 formed between the second plate 120 and the third plate 130, and a plurality of distribution holes 122 are formed to penetrate the second plate 120 to enable some portion of the rich mixture passing the mixture flow path diffuser 172 to be discharged to the lean mixture flow path 176, the rich mixture flow path 173-1 is disposed at an upper portion of the plurality of distribution holes 122, and is configured with a plurality of first rich mixture flow paths 173-1 spaced apart from one another at regular intervals and a second rich mixture flow path 173-2 formed between the plurality of first rich mixture flow paths 173-1 and the first burner port member 140, and a blocking unit A is formed at both sides of each of the plurality of first rich mixture flow paths 173-1 to block a flow of the rich mixture, and blocking protrusion units 117 and 127 are formed at the blocking unit A by deforming portions of the first plate 110 and the second plate 120 which have a flat shape.

The blocking protrusion units 117 and 127 may be configured with a blocking protrusion unit 117 having a shape protruding from one lateral surface of the first plate 110, and a blocking protrusion unit 127 having a shape protruding from one lateral surface of the second plate 120 and inserted inside the blocking protrusion unit 117 of the first plate 110.

The first plate 110, the second plate 220, and the first burner port member 140 may be formed by bending a single thin plate in a shape of I I, and a plurality of first burner ports 141 may be formed to penetrate an upper side bent surface of the single thin plate.

One side of the air flow path introducer 174 may be formed to extend from the air inlet 162 in a horizontal direction and the other side thereof may be formed to block a flow of the air, and the plurality of air through-holes 121 may be formed to be spaced apart from one another along a length direction of the air flow path introducer 174.

The second burner port member 150 may be configured with a second burner port 151 formed such that some portions of a plurality of burner port plates 152 are spaced apart from one another, a plurality of upper recessed grooves 153 concavely formed at a surface coming into contact with the third plate 130, and a plurality of lower recessed grooves 154 concavely formed and spaced apart from the plurality of upper recessed grooves 153 in a downward direction, a plurality of upper embossed portions 131 protruding to be insertable into the plurality of upper recessed grooves 153 and a plurality of lower embossed portions 132 protruding to be insertable into the plurality of lower recessed grooves 154 may be formed at the third plate 130, and the second burner port member 150 may be interposed between the second plate 120 and the third plate 130 and may be fixed through an insertion coupling between the plurality of upper recessed grooves 153 and the plurality of upper embossed portions 131, and between the plurality of lower recessed grooves 154 and the plurality of lower embossed portions 132.

Each of the plurality of upper recessed grooves 153 may be configured in a shape formed to be open in an upward direction and to be blocked in a downward direction, and each of the plurality of lower recessed grooves 154 may be configured in a shape formed to be blocked in the upward direction and to be open in the downward direction. A recessed portion 133 may be concavely formed at a position of the third plate 130 corresponding to the plurality of distribution holes 122 in a direction thereof.

At the third plate 130, at least one dispersion embossed portion may be formed at a lower portion of the recessed portion 133 so as to disperse the air discharged through the plurality of air through-holes 121 in the horizontal direction.

[Advantageous Effects]

In accordance with the rich lean combustion apparatus of the present disclosure, a rich combustion and a lean combustion may be implemented by fuel gas supplied from a single nozzle to reduce the number of components.

Also, a protrusion is formed at a portion at which a mixture is blocked to flow by enabling a first plate and a second plate to come into contact with each other and thus a shape is modified such that a leak of the mixture may be prevented so as to implement a desired mixture.

In addition, a first plate, a second plate, and a first burner port member are integrally formed by bending a single connected plate so that a manufacturing process may be simplified to reduce manufacturing costs.

Additionally, a coupling is made between each of a plurality of plates and each of a plurality of burner port members, which configure a burner body, through a recessed groove and an embossed portion such that components may be coupled to one another with a uniform gap through a simplified structure.

Moreover, a concave portion and a dispersion embossed portion are formed at a third plate such that a mixture may be uniformly mixed.

[Description of Drawings] FIG. 1 is a perspective view illustrating a coupled state of a combustion apparatus of the present disclosure. FIG. 2 is a perspective view illustrating a decoupled state of the combustion apparatus of FIG. 1. FIG. 3 is a perspective view illustrating a state in which a burner assembly and a gas nozzle assembly are decoupled from the combustion apparatus of FIG. 1. FIG. 4 is a perspective view illustrating a state in which the burner assembly and the gas nozzle assembly are coupled to the combustion apparatus of FIG. 1. FIG. 5 is a perspective view illustrating a burner body of the present disclosure. FIG. 6 is a perspective view illustrating a decoupled state of the burner body of FIG. 5. FIGS. 7(a) and 7(b) are cross-sectional views taken along lines A-A’ and B- B’ of FIG. 5. FIG. 8 is a view illustrating a flow process in which fuel gas and air flow into the burner body of the combustion apparatus of FIG. 1. FIG 9 is a view illustrating a longitudinal cross-sectional structure in a state in which a first plate and a second plate come into contact with each other. FIG 10 is a view illustrating a transversal cross-sectional structure in a state in which the first plate and the second plate come into contact with each other. FIGS. 11(a) and 11(b) are perspective views respectively illustrating a state in which first and second burner port members are coupled to first, second, and third plates in the combustion apparatus of FIG. 1, and a decoupled state of the second burner port member. FIG 12 is a view illustrating a flow of air which flows through a space between the second plate and the third plate. ** Description of Reference Numerals ** 1: combustion apparatus 100: burner body 110: first plate 115: flow path planarized part 116 and 126: planarized parts 117 and 127: blocking protrusion units 125: flow path protrusion 120: second plate 121: air through-hole 122: distribution hole 130: third plate 140: first burner port member 150: second burner port member 161: mixture inlet 162: air inlet 171: mixture flow path introducer 172: mixture flow path diffuser 173-1 and 173-2: rich mixture flow paths 174: air flow path introducer 175: air flow path 176: lean mixture flow path 200: burner assembly 210: burner base 211: first inlet hole 212: second inlet hole 213: side plate 214: bottom plate 220: burner cover 300: air blower 400: heat exchanger assembly 500: combustion chamber body 600: cover assembly 700: gas nozzle assembly 710: nozzle [Modes of the Invention]

Hereinafter, configurations and operations for preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view illustrating a coupled state of a combustion apparatus of the present disclosure, FIG. 2 is a perspective view illustrating a decoupled state of the combustion apparatus of FIG. 1, FIG. 3 is a perspective view illustrating a state in which a burner assembly and a gas nozzle assembly are decoupled from the combustion apparatus of FIG. 1, and FIG. 4 is a perspective view illustrating a state in which the burner assembly and the gas nozzle assembly are coupled to the combustion apparatus of FIG. 1. A combustion apparatus 1 of the present disclosure is configured with a plurality of burner bodies 100, a burner assembly 200 configured with a burner base 210 and a burner cover 220 configured to support each of the plurality of burner bodies 100 in front and rear thereof, an air blower 300 configured to supply combustion air to each of the plurality of burner bodies 100, a heat exchanger assembly 400 provided at an upper portion of the burner assembly 200 and configured to enable heat exchange of combustion gas that is generated by a combustion in each of the plurality of burner bodies 100, a combustion chamber body 500 configured to accommodate the burner assembly 200 therein, coupled to the air blower 300 at a bottom surface of the combustion chamber body 500, and configured to provide a combustion space in which a combustion takes place in an upper space of the burner assembly 200, a cover assembly 600 coupled to one open lateral surface of the combustion chamber body 500, and a gas nozzle assembly 700 provided with a nozzle 710, which is configured to supply fuel gas to each of the plurality of burner bodies 100, and coupled to a lower side of the cover assembly 600.

The plurality of burner bodies 100 are provided to be adjacent to one another, and each of which is provided with burner port members 140 and 150 shown in FIG. 5, which are configured to cause a mixture, which flows inside an internal space between the plurality of burner bodies 100, to combust thereby generating flame, at an upper portion of each of the plurality of burner bodies 100.

The burner base 210 has a cross section of an approximate L-shape and is configured with a side plate 213 configured to support a front side edge of each of the plurality of burner bodies 100 and a bottom plate 214 configured to support a lower end portion of each of the plurality of burner bodies 100, and the burner cover 220 is coupled to and supported by a rear side edge of each of the plurality of burner bodies 100.

At the side plate 213, a plurality of first inlet holes 211, which are spaced apart from one another in a horizontal direction, are formed at positions corresponding to mixture inlets 161 of the plurality of burner bodies 100 to enable fuel gas injected from the nozzle 710 and some portion of air supplied from the air blower 300 to be mixed with each other and then to flow into the mixture inlets 161, and further a plurality of second inlet holes 212, which are spaced apart from one another in the horizontal direction, are formed at positions corresponding to air inlets 162 of the plurality of burner bodies 100 to enable the remaining of the air supplied from the air blower 300 to flow into the air inlets 162.

The gas nozzle assembly 700 is located to cover the plurality of first inlet holes 211 and the plurality of second inlet holes 212 of the side plate 213, and is provided with the number of nozzles 710 the same as that of the plurality of first inlet holes 211, the nozzles 710 being spaced apart from one another in the horizontal direction.

The air blower 300 is coupled to the bottom surface of the combustion chamber body 500, and air supplied from the air blower 300 flows into a lower side space of a bottom surface of the burner base 210 of the burner assembly 200 through an air blower outlet 310. FIG. 5 is a perspective view illustrating a burner body of the present disclosure, FIG. 6 is a perspective view illustrating a decoupled state of the burner body of FIG. 5, FIGS. 7(a) and 7(b) are cross-sectional views taken along lines A-A’ and B-B’ of FIG. 5, FIG. 8 is a view illustrating a flow process in which fuel gas and air flow into the burner body in the combustion apparatus of FIG. 1, FIG 9 is a view illustrating a longitudinal cross-sectional structure in a state in which a first plate and a second plate come into contact with each other, FIG 10 is a view illustrating a transversal cross-sectional structure in a state in which the first plate and the second plate come into contact with each other, FIGS. 11(a) and 11(b) are perspective views respectively illustrating a state in which first and second burner port members are coupled to first, second, and third plates in the combustion apparatus of FIG. 1, and a decoupled state of the second burner port member, and FIG 12 is a view illustrating a flow of air which flows through a space between the second plate and the third plate, and hereinafter, a configuration of the burner body and a flow path of a mixture according to the present disclosure will be described with reference to FIGS. 5 to 12. Each of the plurality of burner bodies 100 is configured with a first plate 110 and a second plate 120 which are provided to face each other and enable a rich mixture to flow through a space between the first plate 110 and the second plate 120, a third plate 130 provided to enable a lean mixture to flow through a space between the second plate 120 and the third plate 130, a first burner port member 140 configured to cause the rich mixture to combust, and a second burner port member 150 configured to cause the lean mixture to combust.

The first plate 110 and the second plate 120 are a thin plate with which a flow path portion through which a mixture and air flow is shaped to protrude in an outward direction so as not to enable the first plate 110 and the second plate 120 to come into contact with each other, and a portion through which the mixture and the air do not flow is shaped to enable the first plate 110 and the second plate 120 to come into contact with each other so as to be blocked, edges of the first plate 110 and the second plate 120 are coupled to each other, and the first burner port member 140 is integrally formed with the first plate 110 and the second plate 120 at upper portions thereof.

That is, as shown in FIG. 7(b), the first plate 110, the second plate 120, and the first burner port member 140 are formed by bending a single connected thin plate in a shape of I I and then a plurality of first burner ports 141 are formed to penetrate a bent surface of an upper portion of the single bent thin plate, and edges of a lateral portion and a lower portion of the single bent thin plate are bonded to block a surface at which the first plate 110 and the second plate 120 come into contact with each other except for the mixture inlet 161 and the air inlet 162.

As described above, the first plate 110, the second plate 120, and the first burner port member 140 are integrally formed with the single connected thin plate such that a manufacturing process is simplified and further manufacturing costs are reduced. A flow path, which is formed between the first plate 110 and the second plate 120 and through which the rich mixture flows, is configured with the mixture inlet 161 through which fuel gas injected from the nozzle 710 and some portion of air supplied from the air blower 300 flow in, a mixture flow path introducer 171 extending in a horizontal direction so as to enable the rich mixture to flow, which flows in through the mixture inlet 161, a mixture flow path diffuser 172 extending from the mixture flow path introducer 171 in an upward direction and having a crosssectional area that is to be wide toward the upward direction, and rich mixture flow paths 173-1 and 173-2 extending to an upper side of the mixture flow path diffuser 172 to supply the rich mixture to the first burner port member 140.

Some portion of the rich mixture passing the mixture flow path diffuser 172 is discharged to a space between the second plate 120 and the third plate 130 through a plurality of distribution holes 122 formed in a width direction of the second plate 120 and spaced apart from one another at regular intervals.

Also, a flow path, which is formed between the second plate 120 and the third plate 130 to form the lean mixture, is configured with the air inlet 162 formed at a lower side of the mixture inlet 161 and through which the remaining of the air supplied from the air blower 300 flows in, an air flow path introducer 174 extending in the horizontal direction to enable the air to flow, which flows in through the air inlet 162, a plurality of air through-holes 121 formed to penetrate the second plate 120 along a length direction of the air flow path introducer 174 so as to enable the air flowing thereinto to be discharged to the space between the second plate 120 and the third plate 130, an air flow path 175 which is the space between the second plate 120 and the third plate 130 and formed to enable the air, which is discharged through the plurality of air through-holes 121, to flow in the upward direction, and a lean mixture flow path 176 extending to an upper side of the air flow path 175 to supply the lean mixture to the second burner port member 150.

In the combustion apparatus with such a configuration, by looking at flow paths of the fuel gas and the air, after flowing into a space at a lower portion of the burner base 210 and toward the mixture inlet 161 and the air inlet 162 in the horizontal direction, the air supplied from the air blower 300 is dispersed through the mixture inlet 161 and the air inlet 162 to flow inside each of the plurality of burner bodies 100, and the fuel gas injected from the nozzle 710 is mixed with the air flowing in through the mixture inlet 161 to sequentially pass the mixture flow path introducer 171, the mixture flow path diffuser 172, the first rich mixture flow path 173-1, and the second rich mixture flow path 173-2 and then to be discharged through the plurality of first burner ports 141 of the first burner port member 140 so that a rich combustion takes place.

Also, the air, which flows into the air flow path introducer 174 through the air inlet 162, is discharged through the plurality of air through-holes 121 to flow through the air flow path 175, the air flowing through the air flow path 175 is mixed with the mixture discharged through the plurality of distribution holes 122, and a lean mixture generated as described above is discharged through a second burner port 151 of the second burner port member 150 so that a lean combustion takes place.

Meanwhile, since a ratio of the mixture, which flows between the first plate 110 and the second plate 120, distributed to the rich mixture flow paths 173-1 and 173-2 and the lean mixture flow path 176 is a very significant factor in determining combustion performance, a cross-sectional area of a flow path through which the mixture flows is set to correspond to a distribution ratio of the mixture.

However, when a leak of the mixture occurs at a portion at which surfaces of the first plate 110 and the second plate 120 facing each other are blocked to disenable the mixture to flow, there is a problem in that the rich mixture or the lean mixture may not be supplied to the first burner port member 140 or the second burner port member 150 according to a set ratio of the rich mixture or the lean mixture.

Therefore, a structure of preventing a leak of the mixture is necessary at the portion at which the surfaces of the first plate 110 and the second plate 120 facing each other are blocked.

For this, in the present disclosure, to implement a ratio of the mixture, which is distributed through the rich mixture flow paths 173-1 and 173-2 and the lean mixture flow path 176 that are disposed at an upper portion of each of the plurality of distribution holes 122, according to a set ratio, portions of the first plate 110 and the second plate 120 facing each other are formed by alternately disposing a blocking unit A and a flow path forming unit B, and blocking protrusion units 117 and 127 are formed at the blocking unit A to prevent the mixture from leaking between surfaces of the first plate 110 and the second plate 120 coming into contact with each other at the blocking unit A.

The blocking protrusion units 117 and 127 are formed to protrude by deforming planarized parts 116 and 126 of the first plate 110 and the second plate 120, and more particularly, they are formed by deforming the thin plate in a shape in which the blocking protrusion unit 127 of the second plate 120 is inserted inside the blocking protrusion unit 117 of the first plate 110.

When surfaces come into contact with each other at the blocking unit A, a gap between the surfaces is formed and thus the mixture may leak through the gap, but, in the present disclosure, the thin plate of the blocking unit A is deformed to prevent a gap, through which the mixture leaks, from being formed.

The flow path forming part B is configured with a flow path planarized part 115 which is a portion of the first plate 110 and having a non-deformed flat shape, and a flow path protrusion 125 formed such that the second plate 120 protrudes so as to form the first rich mixture flow path 173-1 between the flow path planarized part 115 and the flow path protrusion 125.

As described above, the present disclosure may simultaneously implement the rich combustion and the lean combustion with only the single nozzle 710 without using two nozzles so that a structure of the combustion apparatus may be simplified.

Also, in the related art, some portion of air supplied from an air blower is supplied in an upward direction through holes formed at a partition plate (corresponding to the burner base of the present disclosure), but in this case, to uniformly supply the air to a plurality of burner bodies, or front and rear sides of a single burner body, it is necessary to differently design a size of each of the holes so that there is a problem in that it is very difficult to set a size of each of all the holes formed at the entire area of the partition plate.

On the other hand, in the present disclosure, air supplied from the air blower outlet 310 is diffused along the space at the lower portion of the burner base 210 and then flows into the air flow path introducer 174 through the air inlet 162, and the air flowing into the air flow path introducer 174 is discharged to the air flow path 175 through the plurality of air through-holes 121, so that flow rates of the air at the air inlet 162 and the plurality of air through-holes 121 are restricted and thus the air is uniformly supplied to each of the plurality of burner bodies 100 and an amount of air, which is discharged through the plurality of air through-holes 121 along the length direction of the air flow path introducer 174, is uniform, thereby resulting in a uniform supply of the air to the front and rear sides of the second burner port member 150. In this case, an adjustment of a supply amount of air may be possible by adjusting a size of only the single air inlet 162 so that design availability may be improved.

Also, a portion of the blocking unit A is deformed to have a protruding shape and thus the rich mixture and the lean mixture are respectively supplied to the first burner port member 140 and the second burner port member 150 according to a set ratio of each of the rich mixture and the lean mixture such that combustion may be stabilized and further discharge of pollutants may be reduced.

Meanwhile, a ratio of the mixture, which is supplied to the first burner port member 140 in which the rich combustion takes place and to the second burner port member 150 in which the lean combustion takes place, is 2:8, and thus the air is more supplied to the second burner port member 150, so that flame formed at a burner port surface of the second burner port member 150 is significantly greater than that formed at the first burner port member 140.

Referring to FIGS. 6 and 7, a recessed portion 133 is concavely formed at a position of the third plate 130 corresponding to the plurality of distribution holes 122 in a direction thereof so that a gap between the second plate 120 and the third plate 130 is to be narrow at a portion at which the plurality of distribution holes 122 are formed.

When the gap between the second plate 120 and the third plate 130 is to be wide, the mixture supplied to the second burner port member 150 is biased to the third plate 130, and as described above, when the recessed portion 133 is formed to narrow the gap between the second plate 120 and the third plate 130, the mixture is uniformly supplied to the second burner port member 150.

Also, referring to FIG. 11, the second burner port 151 formed such that some portions of a plurality of burner port plates 152 are spaced apart from one another, a plurality of upper recessed grooves 153 concavely formed at a surface 150a coming in contact with the third plate 130, and a plurality of lower recessed grooves 154 concavely formed and spaced apart from the plurality of upper recessed grooves 153 in a downward direction are formed at the second burner port member 150, and a plurality of upper embossed portions 131 protruding to be insertable into the plurality of upper recessed grooves 153 and a plurality of lower embossed portions 132 protruding to be insertable into the plurality of lower recessed grooves 154 are formed at the third plate 130.

Each of the plurality of upper recessed grooves 153 has a shape formed to be open in the upward direction and to be closed in the downward direction, and each of the plurality of lower recessed grooves 154 has a shape formed to be closed in the upward direction and to be open in the downward direction.

The second burner port member 150 is interposed between the second plate 120 and the third plate 130 to enable the plurality of upper embossed portions 131 to be inserted into the plurality of upper recessed grooves 153 and the plurality of lower embossed portions 132 to be inserted into the plurality of lower recessed grooves 154, thereby being fixedly coupled between the second plate 120 and the third plate 130. At this point, each of the plurality of upper recessed grooves 153 has the shape formed to be open in the upward direction and each of the plurality of lower recessed grooves 154 has the shape formed to be open in the downward direction, so that an assembling thereof may be easy.

With such a configuration, the second burner port member 150, the second plate 120, and the third plate 130 may be coupled to one another through a simplified configuration to reduce manufacturing costs and further a gap therebetween may be uniformly maintained.

Meanwhile, referring to FIGS. 6, 7, and 11, a first dispersion embossed portion 134 and a second dispersion embossed portion 135 are concavely formed at a lower portion of the recessed portion 133 of the third plate 130 in a direction of the second plate 120.

Therefore, the air discharged through the plurality of air through-holes 121 is dispersed in the horizontal direction by the first dispersion embossed portion 134 and the second dispersion embossed portion 135 and then flows in the upward direction through the air flow path 175, thereby being uniformly mixed with the mixture flowing in through the plurality of distribution holes 122 at a constant ratio.

As described above, the present disclosure is not limited to the above described embodiments, and modified implementations can be devised by those skilled in the art without departing from the technical spirit of the present disclosure as defined in the appended claims. Therefore, such modified implementations should be construed to fall within the scope of the present disclosure.

Claims

[CLAIMS] [Claim 1] A rich lean combustion apparatus comprising: a first plate 110 and a second plate 120 provided to face each other to enable a rich mixture to flow through a plurality of first rich mixture flow paths 173-1 and a second rich mixture flow path 173-2 between the first plate 110 and the second plate 120; a third plate 130 provided to enable a lean mixture to flow through a lean mixture flow path 176 formed between the second plate 120 and the third plate 130; a first burner port member 140 configured to cause the rich mixture to combust; and a second burner port member 150 configured to cause the lean mixture to combust, wherein a mixture inlet 161 through which some portion of air supplied from an air blower 300 and fuel gas injected from a nozzle 710 are introduced, a mixture flow path introducer 171 and a mixture flow path diffuser 172 configured to enable the rich mixture, which flows in through the mixture inlet 161, to flow to the plurality of first rich mixture flow paths 173-1 and the second rich mixture flow path 173-2, an air inlet 162 through which the remaining of the air supplied from the air blower 300 is introduced, and an air flow path introducer 174 configured to enable the air, which flows in through the air inlet 162, to flow are formed between the first plate 110 and the second plate 120, at the second plate 120, a plurality of air through-holes 121 are formed to penetrate the second plate 120 to enable the air of the air flow path introducer 174 to be discharged to an air flow path 175 formed between the second plate 120 and the third plate 130, and a plurality of distribution holes 122 are formed to penetrate the second plate 120 to enable some portion of the rich mixture passing the mixture flow path diffuser 172 to be discharged to the lean mixture flow path 176, the plurality of first rich mixture flow paths 173-1 and the second rich mixture flow path 173-2 are disposed at an upper portion of the plurality of distribution holes 122 and spaced apart from one another at regular intervals and wherein the second rich mixture flow path 173-2 is formed between the plurality of first rich mixture flow paths 173-1 and the first burner port member 140, and portions of the first plate 110 and the second plate 120 facing each other are formed by alternately disposing a blocking unit A and a flow path forming unit B, the blocking unit A is formed to prevent leakage of the rich mixture between surfaces of the first plate 110 and the second plate 120 coming into contact with each other, the flow path forming unit B is formed to allow the flow of the rich mixture, blocking protrusion units 117 and 127 are formed at the blocking unit A by deforming portions of the first plate 110 and the second plate 120 which have a flat shape. [Claim
2] The rich lean combustion apparatus of claim 1, wherein the blocking protrusion units 117 and 127 are configured with a blocking protrusion unit 117 having a shape protruding from one lateral surface of the first plate 110, and a blocking protrusion unit 127 having a shape protruding from one lateral surface of the second plate 120 and inserted inside the blocking protrusion unit 117 of the first plate 110. [Claim
3] The rich lean combustion apparatus of claim 1, wherein the first plate 110, the second plate 220, and the first burner port member 140 are formed by bending a single thin plate in a shape of I I, and a plurality of first burner ports 141 are formed to penetrate an upper side bent surface of the single thin plate. [Claim
4] The rich lean combustion apparatus of claim 1, wherein one side of the air flow path introducer 174 is formed to extend from the air inlet 162 in a horizontal direction and the other side thereof is formed to block a flow of the air, and the plurality of air through-holes 121 are formed to be spaced apart from one another along a length direction of the air flow path introducer 174. [Claim
5] The rich lean combustion apparatus of claim 1, wherein the second burner port member 150 is configured with a second burner port 151 formed such that some portions of a plurality of burner port plates 152 are spaced apart from one another, a plurality of upper recessed grooves 153 concavely formed at a surface coming into contact with the third plate 130, and a plurality of lower recessed grooves 154 concavely formed and spaced apart from the plurality of upper recessed grooves 153 in a downward direction, a plurality of upper embossed portions 131 protruding to be insertable into the plurality of upper recessed grooves 153 and a plurality of lower embossed portions 132 protruding to be insertable into the plurality of lower recessed grooves 154 are formed at the third plate 130, and the second burner port member 150 is interposed between the second plate 120 and the third plate 130 and is fixed through an insertion coupling between the plurality of upper recessed grooves 153 and the plurality of upper embossed portions 131, and between the plurality of lower recessed grooves 154 and the plurality of lower embossed portions 132. [Claim
6] The rich lean combustion apparatus of claim 5, wherein each of the plurality of upper recessed grooves 153 is configured in a shape formed to be open in an upward direction and to be blocked in a downward direction, and each of the plurality of lower recessed grooves 154 is configured in a shape to be blocked in the upward direction and to be open in the downward direction. [Claim
7] The rich lean combustion apparatus of claim 4, wherein a recessed portion 133 is concavely formed at a position of the third plate 130 corresponding to the plurality of distribution holes 122 in a direction thereof. [Claim
8] The rich lean combustion apparatus of claim 7, wherein, at the third plate 130, at least one dispersion embossed portion is formed at a lower portion of the recessed portion 133 so as to disperse the air discharged through the plurality of air through- holes 121 in the horizontal direction.