CN111550790A

CN111550790A - Combustor and gas heater

Info

Publication number: CN111550790A
Application number: CN202010504354.5A
Authority: CN
Inventors: 李忠堂; 高砚庄; 黄伟锋; 林玉绵; 刘小平; 何雨涛
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2020-08-18

Abstract

The invention relates to a burner and a gas water heater, wherein the burner comprises a fire grate component and a fire cover plate, the fire grate component comprises a plurality of fire grates arranged side by side at intervals, an internal channel of the fire grate is a gas mixing channel, a secondary combustion-supporting gas channel is formed between the fire grate and the fire grate at intervals, the fire cover plate is placed on the fire grate component, a fire outlet through hole is formed in the position, corresponding to the gas mixing channel, of the fire cover plate, and a supplement through hole is formed in the position, corresponding to the secondary combustion-supporting gas channel, of the fire cover plate. Based on place fire apron on the subassembly is a monoblock structure, even fire apron with do not adopt modes such as welding fixed connection together between the subassembly is arranged to the fire, also can not have the stability problem, moreover go out the fire through-hole with the setting up of supplementary through-hole makes the combustion process can normally go on. When needing to be changed or maintained, directly will place fire apron on the subassembly is arranged to the fire takes off can, and it is convenient to maintain the renewal.

Description

Combustor and gas heater

Technical Field

The invention relates to the technical field of burner equipment, in particular to a burner and a gas water heater.

Background

The gas water heater mainly comprises a burner, wherein gas is combusted in the burner to provide high temperature for heating water. And mainly include a plurality of fire rows in the combustor, a plurality of fire rows are arranged side by side at interval, are used for leading to the mist that has gas and combustion-supporting gas in the fire row, and the fire is arranged and is arranged the passageway of interval formation between the fire and walk secondary combustion-supporting gas. The gas outlet position generally sets up the fire lid on the fire row, further sets up the fire hole on the fire lid, forms flame in fire hole department after the ignition, and secondary combustion-supporting gas further helps promoting combustion efficiency. For making secondary combustion-supporting gas can follow the fire row and arrange the interval passageway between the gas vent space is arranged to the fire, generally only set up single fire lid on single fire row, the fire lid interval on each fire row in the combustor to arrange the interval passageway between the fire row and reserve, be convenient for the circulation of secondary combustion-supporting gas. However, for the stability of the arrangement of the individual fire covers on the fire rows, it is common to fixedly attach the individual fire covers to the corresponding fire rows. The fire cover is also the high temperature position on the burner, is easy to damage and has the problem of inconvenient maintenance.

Disclosure of Invention

Based on this, it is necessary to provide a burner and a gas water heater, which can improve the convenience of maintenance while ensuring the normal use of the burner.

The utility model provides a combustor, arranges subassembly and fire apron including the fire, the fire is arranged the subassembly and is arranged including a plurality of fires that the interval set up side by side, the inside passage that the fire was arranged is gas blend passage, the fire is arranged and the interval forms the secondary combustion-supporting gas passageway between arranging with the fire, the fire apron is placed on the subassembly is arranged to the fire, on the fire apron with the position that gas blend passage corresponds is equipped with out the fire through-hole, on the fire apron with the position that the secondary combustion-supporting gas passageway corresponds is equipped with the supplementary through-hole.

Above-mentioned scheme provides a combustor, through directly set up in the combustor fire apron, fire apron directly places on the subassembly is arranged in the fire, thereby the gas mixture in the gas mixing channel can be followed the through-hole that fires discharges to fire apron top, secondary combustion-supporting gas in the secondary combustion-supporting gas passageway can be followed the supplementary through-hole discharges to fire apron top, under ignition of ignition, form burning flame in the through-hole that fires department on the fire apron. Based on place fire apron on the subassembly is a monoblock structure, even fire apron with do not adopt modes such as welding fixed connection together between the subassembly is arranged to the fire, also can not have the stability problem, moreover go out the fire through-hole with the setting up of supplementary through-hole makes the combustion process can normally go on. When needing to be changed or maintained, directly will place fire apron on the subassembly is arranged to the fire takes off can, and it is convenient to maintain the renewal.

In one embodiment, the fire outlet through hole comprises a small hole section and a hole expanding section which are sequentially communicated in the fire outlet direction, and the hole diameter of the hole expanding section is larger than that of the small hole section;

or the aperture of the fire outlet through hole is gradually increased in the fire outlet direction.

In one embodiment, the shape of the supplementary through-hole corresponds to the shape of the fire exit through-hole.

In one embodiment, the small bore section and the counterbore section are both cylindrical bores.

In one embodiment, the fire cover plate is provided with a plurality of rows of fire outlet through holes, each row of fire outlet through holes comprises a plurality of fire outlet through holes arranged at intervals along the length direction of the fire grate, and one row of fire outlet through holes corresponds to one fire grate.

In one embodiment, the fire cover plate is provided with a plurality of rows of the supplementary through holes, each row of the supplementary through holes comprises a plurality of supplementary through holes arranged at intervals along the length direction of the fire row, and one row of the supplementary through holes corresponds to one secondary combustion-supporting gas channel.

In one embodiment, the fire deck thickness is greater than 3 mm.

In one embodiment, the top surface of the fire grate for supporting the fire cover plate is a supporting surface, the supporting surfaces of the fire grates are located on the same plane, and the bottom surface of the fire cover plate is attached to the supporting surfaces.

In one embodiment, the fire grate further comprises a shell, the fire grate assembly is arranged in the shell, and the peripheral side face of the fire cover plate is abutted against the shell.

A gas water heater comprises the burner.

Above-mentioned scheme provides a gas heater, through adopting the combustor in above-mentioned arbitrary embodiment, the fire apron design is a monoblock structure place stably on the fire grate subassembly, moreover go out the fire through-hole with the setting up of supplementary through-hole makes the combustion process can normally go on. When needing to be changed or maintained, directly will place fire apron on the subassembly is arranged to the fire takes off can, and it is convenient to maintain the renewal.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a conventional burner;

FIG. 2 is a cross-sectional view of the combustor shown in FIG. 1;

FIG. 3 is a schematic structural view of a burner according to the present embodiment;

FIG. 4 is a cross-sectional view of the burner of FIG. 3;

FIG. 5 is a front view of the burner of FIG. 4 in section;

FIG. 6 is an enlarged view of a portion of FIG. 5 at A;

FIG. 7 is a schematic view of the construction of a fire deck in the burner of FIG. 3;

FIG. 8 is a cross-sectional view of the fire deck of FIG. 7;

FIG. 9 is an enlarged view of a portion of FIG. 8 at B;

FIG. 10 is a schematic view of the burner of FIG. 3 with the fire deck removed;

FIG. 11 is a cross-sectional view of the burner shown in FIG. 10 with the fire deck removed;

fig. 12 is a front view of the burner of fig. 11 in section.

Description of reference numerals:

10. a burner; 11. a fire grate assembly; 111. fire grate; 1111. a gas mixing channel; 1112. a secondary combustion-supporting gas channel; 1113. a support surface; 12. a fire deck; 121. a fire outlet through hole; 1211. a small pore section; 1212. a reaming section; 122. supplementing a through hole; 13. a housing; 14. an ignition device; 20. a conventional burner; 21. and (4) fire cover.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As shown in fig. 1 and 2, each fire grate of a conventional burner 20 of a conventional gas water heater is provided with a fire cover 21, a channel formed at an interval between the fire grate and the fire grate is in an open state, and secondary combustion-supporting gas is discharged from the opening of the channel. The gas mixture flows along the fire exhaust and is exhausted from the fire hole of the fire cover 21 for combustion. The fire cover 21 is welded and fixed on the fire grate, so the fire cover 21 is difficult to be taken down from the fire grate in the maintenance process, and the maintenance is not convenient enough.

In view of this, a burner 10 is provided herein, as shown in fig. 3-5, the burner 10 including a fire row assembly 11 and a fire deck 12. The fire grate assembly 11 comprises a plurality of fire grates 111 arranged side by side at intervals, the internal channel of the fire grate 111 is a fuel gas mixing channel 1111, and secondary combustion-supporting gas channels 1112 are formed between the fire grates 111 and the fire grates 111 at intervals. The fire cover plate 12 is placed on the fire grate component 11, a fire through hole 121 is formed in the position, corresponding to the gas mixing channel 1111, of the fire cover plate 12, and gas mixed gas circulating in the gas mixing channel 1111 can be discharged to the upper portion of the fire cover plate 12 from the fire through hole 121. A supplementary through hole 122 is formed in the position, corresponding to the secondary combustion-supporting gas channel 1112, of the fire cover plate 12, and the secondary combustion-supporting gas in the secondary combustion-supporting gas channel 1112 can be discharged to the upper side of the fire cover plate 12 from the supplementary through hole 122. Specifically, the gas mixture is mainly formed by mixing gas and combustion-supporting gas, and the secondary combustion-supporting gas can be air.

In the combustor 10 provided by the above scheme, by directly arranging the fire cover plate 12 in the combustor 10, the fire cover plate 12 is directly placed on the fire grate assembly 11, so that the mixed gas in the gas mixing channel 1111 can be discharged from the fire outlet through hole 121 to the upper side of the fire cover plate 12, and the secondary combustion-supporting gas in the secondary combustion-supporting gas channel 1112 can be discharged from the supplementary through hole 122 to the upper side of the fire cover plate 12, and under the ignition action of the ignition device 14, a combustion flame is formed at the fire outlet through hole 121 on the fire cover plate 12. Based on place fire apron 12 on the subassembly 11 is arranged to the fire is a monoblock structure, even fire apron 12 with do not adopt modes such as welding fixed connection together between the subassembly 11 is arranged to the fire, also can not have the stability of placing problem, moreover go out fire through-hole 121 with supplementary through-hole 122's setting makes the combustion process can normally go on. When needing to be changed or maintained, the fire cover plate 12 placed on the fire grate component 11 is directly taken down, and the maintenance and the updating are convenient. Specifically, when some of the through holes on the fire cover plate 12 are blocked, the blocked through holes can be dredged after the fire cover plate 12 is removed. When the fire cover plate 12 needs to be replaced, the old fire cover plate 12 is directly taken down from the fire grate component 11, and a new fire cover plate 12 is placed on the fire grate component 11.

Moreover, further, in order to further improve the stability of the fire cover plate 12 placed on the fire grate assembly 11, and at the same time, ensure the sealing performance of the fit between the fire cover plate 12 and the top surface of the fire grate assembly 11, and avoid the situation that the adjacent gas mixing channel 1111 and the secondary combustion-supporting gas channel 1112 are communicated with each other below the fire cover plate 12 due to the gap existing at the contact position of the fire grate 111 and the fire cover plate 12. In one embodiment, as shown in fig. 11 and 12, the top surface of the fire grate 111 for supporting the fire deck 12 is a supporting surface 1113, the supporting surfaces 1113 of the fire grates 111 are located on the same plane, and as shown in fig. 3 to 5, the bottom surface of the fire deck 12 is attached to the supporting surface 1113.

The support surfaces 1113 of the fire rows 111 are located on the same plane and can be attached to the bottom surface of the fire cover plate 12 more reliably, so that the gas in each gas mixing channel 1111 and the secondary combustion-supporting gas channel 1112 cannot flow in the adjacent channel below the fire cover plate 12, the gas mixture in the gas mixing channel 1111 can only be discharged from the fire outlet through hole 121, and the secondary combustion-supporting gas in the secondary combustion-supporting gas channel 1112 can only be discharged from the supplementary through hole 122.

Moreover, because the fire cover plate 12 is a one-piece plate-shaped structure, the self weight is large, and when the fire cover plate 12 is placed on the fire grate assembly 11, the fire cover plate 12 can be pressed on the supporting surface 1113 of each fire grate 111, so that the bottom surface of the fire cover plate 12 is ensured to be higher in adhesion and sealing performance with the supporting surface 1113.

Further, in one embodiment, a groove is formed on the bottom surface of the fire cover plate 12 at a position corresponding to the fire grate 111, so that the top end of the fire grate 111 can be inserted into the groove, and the support surface 1113 can be attached to the bottom surface of the groove, thereby further preventing the gas in the gas mixing channel 1111 and the gas in the secondary combustion-supporting gas channel 1112 from flowing into each other under the fire cover plate 12. Of course, the depth of the groove is shallow, and the groove is mainly used for isolating the gas of the adjacent gas mixing channel 1111 from the secondary combustion-supporting gas channel 1112. The fire row 111 is generally formed by two sheet structures connected together, and the gas mixing channel 1111 is formed between the two sheet structures. The width of the groove, i.e. the distance between the two side walls of the groove, may here coincide with the distance between the two sheet-like structures in the same fire bank 111 at the top. When the top end of the fire grate 111 is inserted into the groove, the top end of the sheet-like structure interferes with the side wall of the groove.

Further, in one embodiment, the fire deck 12 is greater than 3mm thick. Compared with the traditional fire cover arranged on a single fire grate, the fire cover plate 12 in the application has the advantages of larger thickness, larger weight and higher stability when being placed on the fire grate component 11. On the other hand, the fire cover plate 12 with larger thickness has small heat deformation, stronger corrosion and oxidation resistance and longer service life. And the thickness of the fire cover plate 12 is larger, so that the length of the fire outlet through hole 121 is larger, thereby not only improving the heat efficiency of combustion, but also avoiding the occurrence of backfire to a certain extent.

Further, as shown in fig. 6 and 9, in an embodiment, the fire outlet hole 121 includes a small hole section 1211 and a hole expansion section 1212 which are sequentially communicated in the fire outlet direction, and the hole diameter of the hole expansion section 1212 is larger than the hole diameter of the small hole section 1211.

In other words, the fire outlet hole 121 is a stepped through hole, and the diameter of the hole facing the upper outlet end is larger. Therefore, the gas mixture flowing out of the fire outlet through hole 121 firstly enters the small hole section 1211 with a smaller diameter and then reaches the hole expansion section 1212 with a larger diameter, and when the gas mixture reaches the hole expansion section 1212, the pressure is relatively reduced, so that the gas pressure at the fire outlet through hole 121 is reduced, and the occurrence of flame separation is avoided.

Or, optionally, in one embodiment, the hole diameter of the fire outlet through hole 121 gradually increases in the fire outlet direction. Similarly, based on the outlet end aperture of the fire outlet through hole 121 is large, the gas pressure at the fire outlet through hole 121 is reduced, and the occurrence of the flame leaving situation is avoided. Specifically, the fire outlet through hole 121 may be a circular truncated cone hole.

The fire outlet direction in the present application refers to the direction in which the gas mixture flows out of the fire outlet through hole 121.

It should be noted that the angles shown in fig. 7 to 9 are such that the bottom surface of the fire deck 12 faces upward, and when the fire deck 12 is placed on the fire grate assembly 11, the bottom surface of the fire deck 12 faces downward and contacts the top surface of the fire grate assembly 11.

Further, as shown in fig. 3 to 9, in one embodiment, the shape of the supplementary through-hole 122 is identical to the shape of the fire exit through-hole 121. When the fire outlet through hole 121 includes the small hole section 1211 and the enlarged hole section 1212, the supplementary through hole 122 is a stepped through hole conforming thereto. When the hole diameter of the fire outlet through hole 121 is gradually increased in the fire outlet direction, the hole diameter of the supplementary through hole 122 is also gradually increased in the gas outlet direction.

Therefore, in the machining process, only the distance between the through holes needs to be accurately controlled, and the complementary through holes 122 and the fire outlet through holes 121 can be machined by the same process steps.

More specifically, as shown in fig. 6 and 9, in one embodiment, the small bore section 1211 and the reaming section 1212 are both cylindrical bores. In other words, the fire outlet through hole 121 is a stepped circular hole. Optionally, the small hole section 1211 and/or the expanded hole section 1212 may also be a prismatic hole.

Further, by setting the thickness of the fire cover plate 12 to be greater than 3mm, that is, by designing the thickness of the fire cover plate 12 to be larger, it is possible to conveniently set the fire outlet through hole 121 or the supplementary through hole 122 to be a stepped through hole. In other words, the fire deck 12 has a thickness sufficient to satisfy the requirement of providing the fire exit through-hole 121 or the supplementary through-hole 122 as a two-stage hole.

Further, in one embodiment, as shown in fig. 6 to 9, the fire cover plate 12 is provided with a plurality of rows of fire outlet through holes 121, each row of fire outlet through holes 121 includes a plurality of fire outlet through holes 121 spaced apart along the length direction of the fire grate 111, and one row of fire outlet through holes 121 corresponds to one fire grate 111. The gas mixture in one gas mixing channel 1111 is discharged from the fire outlet through hole 121 corresponding to one row. In the use, can control gas mixture as required and get into in the part fire row 111, only have gas mixture to discharge in this part fire row 111 corresponding play fire through-hole 121 this moment.

Similarly, in an embodiment, as shown in fig. 6 to 9, a plurality of rows of the supplementary through holes 122 are provided on the fire cover plate 12, each row of the supplementary through holes 122 includes a plurality of supplementary through holes 122 arranged at intervals along the length direction of the fire row 111, and one row of the supplementary through holes 122 corresponds to one secondary combustion-supporting gas channel 1112. The secondary combustion supporting gas in one secondary combustion supporting gas channel 1112 is discharged from the supplementary through holes 122 corresponding to one entire row.

Finally, an array of through holes as shown in fig. 3 and 7 is formed on the fire deck plate 12. When the complementary through hole 122 is identical to the shape of the fire outlet through hole 121, the shapes of the through holes in the through hole array are identical. Specifically, the fire bars 111 included in the fire bar assembly 11 are uniformly distributed at intervals, and the distance between each row of through holes in the through hole array is the same.

When the gas mixture is discharged and combusted in the fire outlet through hole 121 adjacent to the supplementary through hole 122, the air in the secondary combustion-supporting gas channel 1112 corresponding to the supplementary through hole 122 is sucked into the supplementary through hole 122 and discharged from the upper opening of the supplementary through hole 122, so as to further provide oxygen for the combustion process.

Further, in one embodiment, as shown in fig. 3 to 5, the burner 10 further includes a housing 13, the fire grate assembly 11 is disposed in the housing 13, the peripheral side surface of the fire cover plate 12 abuts against the housing 13, and the fire cover plate 12 is limited, so that the fire outlet through hole 121 of the fire cover plate 12 can be opposite to the gas mixing channel 1111, and the supplementary through hole 122 can be opposite to the secondary combustion-supporting gas channel 1112.

Specifically, as shown in fig. 3 to 5, the housing 13 encloses a rectangular parallelepiped space having an opening, the fire grate assembly 11 is placed in the housing 13, and when the fire grate plate 12 is placed on the fire grate assembly 11, the periphery of the fire grate plate 12 is limited by the side wall of the housing 13. The casing 13 is provided with gas inlets which are correspondingly communicated with the gas mixing channels 1111 in the fire grate 111, the number of the gas inlets is consistent with that of the fire grate 111, and the gas inlets are in one-to-one correspondence with the gas mixing channels 1111.

Further, in another embodiment, a gas water heater is provided, comprising the burner 10 described above.

According to the gas water heater provided by the scheme, by adopting the burner 10 in any embodiment, the fire cover plate 12 is designed into a whole structure, the fire grate assembly 11 is stably placed, and the arrangement of the fire outlet through hole 121 and the supplement through hole 122 enables the combustion process to be normally carried out. When needing to be changed or maintained, the fire cover plate 12 placed on the fire grate component 11 is directly taken down, and the maintenance and the updating are convenient.

Further, in an embodiment, the gas water heater further includes a gas distributing rod and a gas mixing pipe, the gas mixing pipe is communicated between a nozzle of the gas distributing rod and a gas inlet of the burner 10, and a combustion-supporting gas inlet is arranged on the gas mixing pipe. The gas enters the gas mixing pipe from the gas distributing rod, the combustion-supporting gas with high oxygen content enters the gas mixing pipe from the combustion-supporting gas inlet, and the mixed gas mixture enters the burner from the gas inlet and flows to the fire outlet through hole 121 from the gas mixing channel 1111.

Further, still include heat exchanger among the gas heater, be equipped with heat exchange coil on the heat exchanger, heat exchange coil is used for leading to water. Be equipped with the flue gas passageway in the heat exchanger, the flue gas passageway with the opening intercommunication of the casing 13 of combustor 10 for the flue gas that the burning of going out fiery through-hole 121 formed gets into in the flue gas passageway, the flue gas will when circulating in the flue gas passageway water heating in the heat exchange coil, for the user uses.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a combustor, its characterized in that, arranges subassembly and fire apron including the fire, the fire is arranged the subassembly and is arranged including a plurality of fires that the interval set up side by side, the inner passage that the fire was arranged is gas mixing channel, the fire is arranged and the fire forms the combustion-supporting gas passageway of secondary at the interval between arranging, the fire apron is placed on the subassembly is arranged to the fire, on the fire apron with the position that gas mixing channel corresponds is equipped with out the fire through-hole, on the fire apron with the position that the combustion-supporting gas passageway of secondary corresponds is equipped with the supplementary through-hole.

2. The burner of claim 1, wherein the fire outlet through hole comprises a small hole section and a hole expanding section which are communicated in sequence in a fire outlet direction, and the hole diameter of the hole expanding section is larger than that of the small hole section;

3. The burner of claim 2 wherein the shape of the supplemental throughbores conforms to the shape of the firing throughbores.

4. The burner of claim 2, wherein the small bore section and the counterbore section are both cylindrical bores.

5. The burner as claimed in any one of claims 1 to 4, wherein the fire cover plate is provided with a plurality of rows of the fire outlet through holes, each row of the fire outlet through holes comprises a plurality of fire outlet through holes arranged at intervals along the length direction of the fire grate, and one row of the fire outlet through holes corresponds to one fire grate.

6. The burner according to any one of claims 1 to 4, wherein a plurality of rows of the supplementary through holes are formed in the fire cover plate, each row of the supplementary through holes comprises a plurality of supplementary through holes arranged at intervals along the length direction of the fire row, and one row of the supplementary through holes corresponds to one secondary combustion-supporting gas channel.

7. A burner as claimed in any one of claims 1 to 4, wherein the fire deck thickness is greater than 3 mm.

8. The burner as claimed in any one of claims 1 to 4, wherein the top surface of the fire grate for supporting the fire cover plate is a supporting surface, the supporting surfaces of the fire grates are located on the same plane, and the bottom surface of the fire cover plate is attached to the supporting surface.

9. The burner of any one of claims 1 to 4, further comprising a housing, wherein the fire grate assembly is disposed in the housing, and wherein a peripheral side of the fire deck interferes with the housing.

10. A gas water heater comprising a burner as claimed in any one of claims 1 to 9.