CN213577484U - Burner unit and gas water heating equipment adopting same - Google Patents

Abstract

The utility model provides a burner unit, it includes the plate-shaped main part that the lengthwise extends, and the top of this plate-shaped main part is equipped with a plurality of first fire holes that are arranged in providing one kind among dense burning flame and the light burning flame and are arranged in providing another kind among dense burning flame and the light burning flame a plurality of second fire holes along lengthwise direction distribution. Wherein, in the horizontal width direction of perpendicular to lengthwise direction, a plurality of second fire holes are located the both sides of a plurality of first fire holes. And spoilers corresponding to the first fire holes and/or the second fire holes are arranged in the top of the plate-shaped main body. Through the structure, the emission of nitrogen oxides can be effectively reduced, and meanwhile, the noise generated during combustion is improved.

Description

Burner unit and gas water heating equipment adopting same

Technical Field

The utility model belongs to the combustion apparatus field, concretely relates to combustor unit and adopt gas hot water system of this combustor unit.

Background

A burner, a heat exchanger, and a combustion chamber housing the burner and the heat exchanger are generally provided in a gas water heater or a gas boiler. The burner often includes a plurality of fire segments arranged side by side, each having a gas-air mixing channel in which gas and air are mixed and transferred to fire holes at the top of the fire segments for combustion in the combustion chamber and generating heat, which heats the water in the heat exchanger so that the heated water can be used for drinking, bathing, or heating, etc.

The burner generates exhaust gases during combustion and is vented to the atmosphere. The exhaust gas generally contains components having an influence on the human body and the atmosphere, such as carbon monoxide (CO) or nitrogen oxides (NOx). With the improvement of living standard and awareness of environmental protection, people pay more and more attention to the emission of harmful gases in household gas appliances. The emission of carbon monoxide has been a concern for a long time, and manufacturers of a large number of gas appliances have taken corresponding measures to reduce the emission of carbon monoxide, however, the emission of nitrogen oxides has not received sufficient attention.

Research and analysis show that the toxicity of nitrogen oxide is higher than that of carbon monoxide, and long-term emission causes two pollution to the atmosphere: acid rain and Photochemical Smog (Photochemical Smog). The main technology widely used at present for reducing the emission of nitrogen oxides of civil gas appliances is the thick and thin combustion technology.

The basic principle of the rich-lean combustion is that a part of the fuel gas is combusted under the condition of insufficient air, namely the fuel is combusted in a rich way, and the other part of the fuel gas is combusted under the condition of excessive air, namely the fuel is combusted in a lean way. In both cases, the Stoichiometric Ratio (stoichimetric Ratio) of fuel gas and air deviates from the theoretical Stoichiometric Ratio of combustion reaction, the oxygen concentration in the rich flame is lower, and the primary combustion temperature is lower than that in the Stoichiometric Ratio, so that the generation of nitrogen oxides can be reduced; and the oxygen concentration in the light flame is high, but the primary combustion temperature is reduced due to insufficient fuel gas, so that the emission of nitrogen oxides is reduced, and finally, the total nitrogen oxides during combustion are reduced. Meanwhile, secondary combustion exists in the process of thick and thin combustion, and secondary combustion of thick and thin flames is carried out among primary combustion products after primary combustion is respectively completed. Since the primary combustion product contains a large amount of gases such as carbon dioxide and water, the temperature and oxygen concentration in the secondary reaction zone are low, and the generation of nitrogen oxides is suppressed. Therefore, both of the primary combustion and the secondary combustion of the rich-lean combustion can effectively suppress the generation of nitrogen oxides. The burner structure of the prior art using a rich-lean combustion is shown in european patent publication EP 0587456B 1.

However, the lean combustion provides only one theoretical solution for reducing the emission of nitrogen oxides, and various problems need to be comprehensively considered in the actual design and development process. For example, although a low-nitrogen burner using a rich-lean combustion has been designed, other problems have been additionally generated due to the increased complexity of the burner structure, such as that noise problems due to vibration, squeal, etc. during combustion become prominent, or that it is difficult to uniformly control noise under different flue resistances, which are still problems urgently needed to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a combustor unit, it can effectively reduce nitrogen oxide's emission, the noise that produces when improving the burning simultaneously.

An object of the utility model is also to provide a gas hot water apparatus who adopts above-mentioned combustor unit.

In order to achieve one of the above objects of the present invention, the present invention provides a burner unit, which includes a plate-shaped main body extended lengthwise, the top of which is provided with a plurality of first fire holes distributed in a lengthwise direction for providing one of a rich combustion flame and a lean combustion flame, and a plurality of second fire holes for providing the other of the rich combustion flame and the lean combustion flame. Wherein, in the horizontal width direction of perpendicular to lengthwise direction, a plurality of second fire holes are located the both sides of a plurality of first fire holes. And spoilers corresponding to the first fire holes and/or the second fire holes are arranged in the top of the plate-shaped main body.

As a further improvement, the spoiler has a spoiler portion bent to form and corresponding to the first fire hole and/or the second fire hole.

As a further improvement, the spoiler has a plurality of spoiler portions that are bent continuously along the lengthwise direction and that correspond to a plurality of first fire holes and/or a plurality of second fire holes.

As a further improvement of the utility model, the spoiler corresponds with a plurality of first fire holes, wherein, first fire hole is used for providing light burning flame.

As a further improvement of the utility model, the plate-shaped main body comprises a vertically arranged and lengthily extended body, the upper part of the body is provided with an accommodating part, and an accommodating cavity is formed in the accommodating part; the plate-shaped main body also comprises a combustion head accommodated in the accommodating cavity and a shell at least covering the accommodating part of the main body; a plurality of first fire holes are formed at the top of the combustion head, and a plurality of second fire holes are formed in a gap between the accommodating part of the body and the shell.

As a further improvement of the utility model, the spoiler is at least partially accommodated in the combustion head to correspond to the plurality of first fire holes.

As a further improvement of the utility model, the body is provided with a first air inlet and a second air inlet positioned above the first air inlet at one lengthwise end; wherein the first air inlet is in communication with the first fire hole for supplying a first gas-air mixture and the second air inlet is in communication with the second fire hole for supplying a second gas-air mixture.

To achieve the above object, the present invention also provides a gas water heater, which includes a burner and a heat exchanger. The burner comprises a plurality of the above burner units arranged side by side. The heat exchanger is used to absorb heat generated by the burner and transfer the heat to a flow of water through the heat exchanger.

Compared with the prior art, the beneficial effects of the utility model are that: through setting up the spoiler, can change the velocity of flow and the flow direction of gas and air mixing air current in the combustor unit to make the further intensive mixing of air current, thereby increased the design allowance of low-nitrogen combustor in the aspect of noise control, with obtain more abundant operating space under the flue resistance of difference, and then when reducing nitrogen oxide and discharging, improve the noise problem.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings related to the present invention in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a first embodiment of a burner of the present invention;

FIG. 2 is a schematic perspective view of a burner unit employed in the burner shown in FIG. 1;

FIG. 3 is an exploded isometric view of the burner unit shown in FIG. 2;

FIG. 4 is an exploded isometric view of the combustion head of the burner unit shown in FIG. 3;

FIG. 5 is a schematic perspective view of the burner unit shown in FIG. 2, partially broken away;

FIG. 6 is a schematic cross-sectional view of the burner unit shown in FIG. 2;

FIG. 7 is a top view of the burner unit shown in FIG. 2;

FIG. 8 is a schematic plan view of an embodiment of the gas fired water heater of the present invention with the front cover removed to show its internal structure;

fig. 9 is a schematic perspective view of a second embodiment of the burner unit of the present invention;

FIG. 10 is an exploded isometric view of the burner unit shown in FIG. 9;

FIG. 11 is a schematic cross-sectional view of the burner unit shown in FIG. 9;

fig. 12 is a schematic perspective view of a third embodiment of the burner unit of the present invention;

FIG. 13 is a schematic cross-sectional view of the burner unit shown in FIG. 12;

fig. 14 is an exploded perspective view of the burner unit shown in fig. 12.

Detailed Description

The present invention will be described in detail below with reference to embodiments shown in the drawings. However, these embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art based on these embodiments are all included in the scope of the present invention.

Gas-fired water heating equipment such as a gas water heater and a gas boiler use combustible gas as fuel, such as natural gas, city gas, liquefied gas, methane and the like, and the combustible gas is combusted to heat hot water so as to meet the requirements of domestic water and/or central heating of users. The present invention will be described in the following embodiments by taking a gas water heater as an example, but the present invention is also applicable to a gas boiler.

Reference is first made to fig. 8, which shows a first embodiment of the gas-fired water heating apparatus of the present invention. The gas water heating apparatus 100 includes a housing, a hood 93, a heat exchanger 91, a burner, a fan 92, and a water inlet pipe, a water outlet pipe, and a gas delivery pipe, etc., which extend out of the housing, which are accommodated in the housing.

The housing may be generally formed by splicing a plurality of cover plates, such as a front cover plate, a back plate, a top cover plate, a bottom cover plate, and a pair of side cover plates. The heat exchanger 91 is usually installed at the upper portion of the burner, and in this embodiment, the heat exchanger may be a fin-and-tube heat exchanger, i.e., a plurality of fins are provided in a heat exchanger housing, and a heat absorption water pipe (not shown) is circuitously passed through the fins, and both ends thereof are respectively communicated with the water inlet pipe and the water outlet pipe. The gas-air mixture is combusted in the combustor shell, the generated heat is absorbed by the fins of the heat exchanger and further transferred to the water flowing through the heat absorption water pipe, and the heated water is transferred to the water pipe of the domestic water through the water outlet pipe, so that the domestic water for drinking, bathing and the like is provided for users.

A fan 92 is provided at a lower side of the burner for promoting convection of the gas to provide air required for combustion and to promote discharge of the flue gas into the hood 93. A hood 93 is fastened to the top of the heat exchanger 91 for collecting the flue gas (exhaust gas containing carbon monoxide, nitrogen oxides, etc.) generated from the burner and discharging it to the outside.

Fig. 1 shows a specific embodiment of the burner of the present invention. The burner comprises a box 2 and a plurality of burner units 1 housed inside the box and arranged side by side.

As shown in fig. 2 and 3 in combination, the burner unit 1 is made of a metal plate material, and has a body 10, a burner head 20 housed above the body, and a casing 30 covering substantially the upper half of the body. The body 10 is substantially vertical plate-shaped, and has a longitudinally extending receiving portion 13 at the top thereof, in which a receiving cavity 131 is defined for receiving the burner head 20. A first air inlet 11 is formed at a lower position of one longitudinal end of the body 10, and a first fuel-air mixing chamber 111 is communicated between the first air inlet 11 and the receiving chamber 131. Also, a second air inlet 12 is formed at one lengthwise end of the body 10 above the first air inlet 11, a second fuel-air mixing chamber 121 is formed in the body 10 along the second air inlet, and a plurality of through holes 1211 are formed at the rear of the second fuel-air mixing chamber.

The housing 30 has a pair of side plates 31 extending lengthwise. Referring to fig. 5, a cylindrical cavity 32 is disposed at one end of the side plate 31 for covering the second gas-air mixing chamber 121. Ribs are spaced apart from the top of the housing 30 and span between the pair of side plates 31 to confine the burner head 20 within the receiving cavity 131 of the body. The upper portion of the housing 30 is provided with a plurality of concave recesses 312 at intervals along the longitudinal direction for abutting against the outer wall of the receiving portion 13 of the body and forming a gap therebetween. The upper part of the outer casing 30 is further provided with a plurality of convex protrusions 311 at intervals along the longitudinal direction, and the convex protrusions are used for abutting against the protrusions on the adjacent burner units so as to avoid the outer casing of the burner units from being deformed due to high-temperature combustion.

As shown in fig. 4 to 7, in the present embodiment, the combustion head 20 includes a first combustion head and a second combustion head which have the same structure and are symmetrically arranged. Since the structures are the same, only one will be described below. The first combustion head is formed from sheet metal by stamping and bending and has a pair of vertical plates 21, 23 extending in a vertical direction and a flat plate 22 connected between the tops of the pair of vertical plates. The flat plate 22 is provided with fire holes 221 extending in the longitudinal direction, and in the present embodiment, a plurality of fire holes 221 are distributed at intervals on the flat plate 22. As shown in fig. 4, a plurality of spacing ribs 231 are convexly provided on the vertical plate 23 at opposite sides of the first and second combustion heads to divide the space between the first and second combustion heads into a plurality of spaces in the longitudinal direction and correspond to the fire holes 211 of the first and second combustion heads in the transverse width direction perpendicular to the longitudinal direction. In addition, a plurality of spoiler portions 232 are protruded between the interval ribs 231 on the vertical plate 23. The vertical plates 21 of the mutually distant sides of the first and second combustion heads extend straight.

As shown in fig. 2 and 5, the first intake port 11 and the second intake port 12 of the burner unit 1 are respectively supplied with fuel-air mixtures of different fuel-air stoichiometric ratios. Wherein, the gas and the primary air supplied by a fuel supply device (not shown) pass through the first air inlet 11 in a set ratio. The first fuel-air mixing chamber 111 is formed with a venturi (venturi) portion adjacent to the first intake port 11. The venturi tube, which adsorbs the gas at the gas inlet by venturi effect, may generally consist of an inlet convergent section of axial cross-section, a cylindrical throat section and a conical divergent section. Since the principles and construction of venturi tubes are well known to those of ordinary skill in the art, applicant is not further described herein. The incoming gas and air are thoroughly mixed by the first mixing chamber 111 to produce a first fuel-air mixture, which then flows into the flow path defined by the vertical plates 21, 23 of the burner head and finally is combusted through the fire holes 231 of the burner head. In the present embodiment, the burner head 20 constitutes a first combustion portion, and the burner holes distributed at the tip thereof constitute first burner holes 221 for burning the first fuel-air mixture to generate one of a rich flame or a lean flame. The flame type is related to the stoichiometric ratio of the first fuel-air mixture. Similarly, the gas and the primary air supplied from the fuel supply device (not shown) pass through the second air inlet 12 in a predetermined ratio, are sufficiently mixed in the second mixing chamber 121, enter the gap between the housing side plate 31 and the side wall of the accommodating portion 13 through the through hole 1211, and are finally combusted at the fire hole at the top thereof. The combustion portion at the top of the gap constitutes a second combustion portion in which a plurality of fire holes partitioned by the recess 312 constitute second fire holes 223 for combusting the second fuel-air mixture to generate the other of a rich flame or a lean flame. Likewise, the flame species is related to the stoichiometric ratio of the second fuel-air mixture.

As mentioned above, the first fuel-air mixing chamber 111 and the second fuel-air mixing chamber 121 of the burner unit 1 are respectively used to provide fuel-air mixtures of different fuel-air stoichiometric ratios, such as a rich fuel-air mixture and a lean fuel-air mixture. The term rich fuel-air mixture as used herein refers to a mixture of fuel and primary air that is "rich" compared to the theoretical stoichiometric ratio for a complete combustion reaction of fuel and air, in which case the primary air factor is relatively low and the combustion is rich and the resulting flame is a rich combustion flame; conversely, a lean fuel-air mixture is a mixture of fuel and primary air that is "lean" compared to the theoretical stoichiometric ratio for a complete combustion reaction of fuel and air, in which case the primary air factor is greater and the combustion is lean and the resulting flame is a lean combustion flame. In the present embodiment, the fuel is gas, a light gas-air mixture is formed in the first fuel-air mixing chamber 111, and accordingly, the flame formed on the first fire hole 221 is a light combustion flame; while a rich gas-air mixture is formed in the second fuel-air mixing chamber 121, and accordingly, the flames formed on the second fire holes 223 are rich combustion flames.

Referring to fig. 6 and 7 in combination, in this embodiment, the first fire holes 231 have three longitudinal rows located on the flat plates 22 of the first and second combustion heads and between the vertical plates 23 of the first and second combustion heads, respectively. In the width direction, a first interval width is formed between the first fire holes 231 for separating the first fire holes 231, so that each first fire hole 231 can be provided with a single flame, the overall surface area of the flame is increased, heat dissipation is facilitated to reduce the combustion temperature, and emission of nitrogen oxides is reduced. The first spacing width is at least greater than the thickness of the metal sheet forming the burner head itself and is preferably greater than twice the thickness of the sheet in order to avoid the flames produced by the burner ports from merging with one another, in this embodiment greater than three times the thickness of the sheet, by the portion 222 of the plate 22 of the first and second burner heads laterally alongside the first burner port 221. Similarly, a second spacing width is formed between the first fire hole 221 and the second fire hole 223 in the transverse width direction, and the second spacing width is larger than the first spacing width and is equal to the width of the portion 224 on the other side of the first fire hole 221 plus the thickness of the plate at the accommodating part 13 of the body in size.

The following table is data measured for the gas water heater in the above embodiment according to the requirements and manner of the nitrogen oxide emissions test (chapter 6.9.3) in the european standard for testing gas water heaters (EN 26: 2015). Wherein the test conditions are as follows:

the natural gas source types are as follows: g20;

ambient temperature: 24.1 ℃;

ambient air pressure: 1021 mbar;

relative humidity: 9.7g water/kg air;

the water inlet temperature of the water heater is as follows: 10.0 ℃, water outlet temperature: 40.0 ℃;

rated power of burner: 31.00kW, minimum power: 5 kW;

as can be seen from the above table, when the measured load Q1 close to the rated power is 31.15kW, the emission amount of nitrogen oxides is 60 ppm; the emission of nitrogen oxides is 33ppm at a measured load close to 70% of rated power, i.e. Q2 ═ 21.65 kW; the emission of nitrogen oxides is 21ppm at a measured load close to 50% of rated power, i.e. Q3-15.86 kW; at a measured load near minimum power, i.e., Q4 ═ 5.05kW, the nox emission was 25 ppm. Therefore, according to the weighted values defined in section 6.9.3.2 of the above european standard (EN 26: 2015), i.e., 0.10 for Q2, 0.45 for Q3, and 0.45 for Q4, the NOx emission of the instantaneous gas water heater with adjustable load output is 0.10 × 33+0.45 × 21+0.45 × 25 — 24 ppm. Finally, according to the european standard, the emission of nitrogen oxides, as converted in accessory K, is 24 × 1.764 ═ 42.336mg/kW · h, which fully satisfies the ErP directive for nitrogen oxide emissions of conventional water heaters fuelled with gas, and should not exceed 56mg/kW · h.

Fig. 9 to 11 disclose a second embodiment of the burner unit of the present invention. In this embodiment, the burner unit 5 includes a vertically arranged and longitudinally extending body 50, and the body 50 is formed by fastening two symmetrical and press-formed plates. The upper part of the body is provided with a receiving part 53 in which a receiving cavity is formed. The burner unit 5 further includes a burner head 60 housed in the housing chamber, and a housing 70 covering at least the housing portion 53 of the main body. The burner head 60 is formed by continuously bending a single metal plate and includes a pair of vertical portions 63 closely adhered together and connected at the bottom, and a pair of horizontal portions 62 horizontally extending from the top ends of the vertical portions, respectively, away from each other. A plurality of first fire holes 621 are provided on the pair of horizontal portions 62 for providing one of a rich flame and a lean flame. The gap between the receiving portion 53 of the body and the housing 70 is formed at the top thereof with a plurality of second fire holes 622 for providing the other one of the rich flame and the lean flame. The second fire holes 622 are located at both sides of the first fire holes 621 in a widthwise direction perpendicular to the lengthwise direction. In the present embodiment, the flames formed in the first flame holes 621 are light-burn flames, and the flames formed in the second flame holes 622 are rich-burn flames.

The lower portion of the body 50 is provided with a first air inlet 51 and a second air inlet 52 located above the first air inlet at one longitudinal end thereof. Wherein the first air inlet 51 communicates with the first fire hole 621 for supplying the first gas-air mixture, and the second air inlet 52 communicates with the second fire hole 622 for supplying the second gas-air mixture. The housing 70 has a pair of side plates 71 extending lengthwise. A plurality of ribs 713 are spaced apart from the top of the housing 70 and span between the pair of side plates 71 to restrain the burner head 60 within the receiving cavity of the body. A plurality of concave recesses 712 are formed at intervals along the longitudinal direction at the upper portion of the housing 70 for abutting against the outer wall of the housing 53 of the body, and a gap is formed between the inner wall of the housing 70 and the outer wall of the housing 53 of the body, so that the gas entering from the second gas inlet 52 flows to the second fire hole 622. The upper longitudinal end of the casing 70 is provided with a convex protrusion 711 for abutting against a protrusion on an adjacent burner unit to prevent the casing of the burner unit from being deformed due to high temperature combustion.

In the lateral width direction, since at least one pair of vertical portions 63 are spaced between the plurality of first fire holes 621 provided on the horizontal portion 62, the first spacing width between the first fire holes 621 is greater than twice the thickness of the metal plate material itself forming the burner unit. Thus, a separate flame can be formed on each of the first flame holes 621 to increase the overall surface area of the flame, thereby facilitating heat dissipation to lower the combustion temperature, and further facilitating reduction of emission of nitrogen oxides. In addition, the combustion head 60 further includes a pair of wings 61 extending vertically downward from the end of the horizontal portion 62, and the inner wall of the body receiving portion 53 is abutted against the wings 62 of the combustion head. Through this kind of setting for first fire hole 621 and second fire hole 622 are also greater than the twice of above-mentioned sheet metal self thickness at the second interval width of horizontal width direction to increase the holistic surface area of flame that forms on the second fire hole 622, do benefit to the heat dissipation in order to reduce combustion temperature, and then be favorable to reducing nitrogen oxide's emission. In addition, compared with the previous embodiment, the combustion head 60 is integrally formed by a single metal plate, and the structure is simple, so that the manufacturing and processing are facilitated, and the material cost is saved.

Further, the housing portion 53 of the main body is provided with a groove 531 which is recessed toward the combustion head 60 and extends in the longitudinal direction. The groove 531 is located below the wing 61 of the burner head so that the first gas-air mixture is sufficiently disturbed before flowing to the first fire holes 621 so as to be uniformly distributed to the first fire holes 621 in the lengthwise direction. The housing 70 further has a plurality of notches 714 formed therein and recessed toward the receiving portion 53 of the body, and the notches correspond to the pairs of second fire holes 622 formed therein in the middle in the longitudinal direction. With this arrangement, the second gas-air mixture is sufficiently disturbed before flowing to the second fire holes 622 so as to be uniformly distributed to the second fire holes 622 in the lengthwise direction.

Fig. 12 to 14 disclose a third embodiment of the burner unit of the present invention. The burner unit of the present embodiment has the same main structure as the burner unit 5 of the second embodiment, and therefore, the same portions are denoted by the same reference numerals as in the second embodiment, and the description will be given with reference to the second embodiment shown in fig. 9 to 11. In the present embodiment, the burner unit includes a plate-shaped main body extending lengthwise, which includes a body 50 disposed vertically and extending lengthwise. The upper part of the body is provided with a receiving part 53 in which a receiving cavity is formed. The plate-like body further includes a combustion head 60 housed in the housing chamber, and a casing 70 covering at least the housing portion 53 of the body. The burner head 60 includes a pair of vertical portions 63 closely fitted together and connected at the bottom, and a pair of horizontal portions 62 horizontally extending from the top ends of the pair of vertical portions, respectively, away from each other. A plurality of first fire holes 621 are provided on the pair of horizontal portions 62 for providing one of a rich flame and a lean flame. The gap between the receiving portion 53 of the body and the housing 70 is formed at the top thereof with a plurality of second fire holes 622 for providing the other one of the rich flame and the lean flame. The second fire holes 622 are located at both sides of the first fire holes 621 in a widthwise direction perpendicular to the lengthwise direction. In the present embodiment, the flames formed in the first flame holes 621 are light-burn flames, and the flames formed in the second flame holes 622 are rich-burn flames.

In this embodiment, a pair of spoilers 80 are also provided in the top of the plate-like body, and are each partially extended and housed within the horizontal portion 62 of the burner head 60. The spoiler 80 is continuously bent in the longitudinal direction to form a plurality of spoiler portions 81 corresponding to the plurality of first fire holes 621. As shown in fig. 12 and 13, 5 first fire holes 621 are formed in the horizontal portion 62 of one lateral side of the burner head 60 in the longitudinal direction. The spoiler 80 is formed with 5 spoiler portions 81 by being continuously bent to correspond to the 5 first fire holes 621, respectively. Preferably, flat plate-shaped connecting portions 82 extending straight in the vertical direction are provided between the spoiler portions 81 of the spoiler 60, and a middle portion 811 of each spoiler portion 81 has the same flat plate shape. With this structure, as shown in fig. 13, when the spoiler 80 is assembled into the horizontal portion 62 of the combustion head, the middle portion 811 of the spoiler 81 abuts against the bottom of the groove 531 of the body receiving portion, and the connecting portion 82 abuts against the vertical portion 63 of the combustion head, so that the spoiler 80 is securely and fixedly received in the combustion head 60.

Through setting up the spoiler, can change the velocity of flow and the flow direction of gas and air mixing air current in the combustor unit to make the further intensive mixing of air current, thereby increased the design allowance of low-nitrogen combustor in the aspect of noise control, with obtain more abundant operating space under the flue resistance of difference, and then when reducing nitrogen oxide and discharging, improve the noise problem. In the present embodiment, 5 spoiler portions 81 are integrally formed on one spoiler 80, but in other embodiments, 5 spoiler portions may be separately and individually molded and respectively incorporated into the combustion head 60 to correspond to the 5 first fire holes 621. In addition, the spoiler may also be disposed between the receiving portion 53 of the body and the housing 70 to correspond to the plurality of second fire holes 622; alternatively, spoilers may be provided in the burner head 60 and between the housing portion 53 of the body and the housing 70 to correspond to both the first fire hole and the second fire hole. In addition, the spoiler in the present embodiment is also applicable to the burner unit 1 in the first embodiment; at this time, the spoiler may be completely received in the first and second combustion heads of the combustion head 20. Since variations of the above-described structure will be apparent to those skilled in the art, applicant is not described herein in detail.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (8)

1. A burner unit comprises a plate-shaped main body extending lengthways, wherein the top of the plate-shaped main body is provided with a plurality of first fire holes distributed along the lengthways direction and used for providing one of a rich combustion flame and a lean combustion flame, and a plurality of second fire holes used for providing the other one of the rich combustion flame and the lean combustion flame; the second fire holes are positioned on two sides of the first fire holes in the transverse width direction perpendicular to the longitudinal direction; the method is characterized in that: and spoilers corresponding to the first fire holes and/or the second fire holes are/is further arranged in the top of the plate-shaped main body.

2. Burner unit according to claim 1, characterized in that: the spoiler is provided with a spoiler portion which is formed by bending and corresponds to the first fire hole and/or the second fire hole.

3. Burner unit according to claim 1 or 2, characterized in that: the spoiler is provided with a plurality of spoiler portions which are formed by continuously bending along the longitudinal direction and correspond to the first fire holes and/or the second fire holes.

4. Burner unit according to claim 1, characterized in that: the spoiler corresponds to a plurality of first fire holes, and the first fire holes are used for providing a light combustion flame.

5. Burner unit according to claim 1 or 4, characterized in that: the plate-shaped main body comprises a body which is vertically arranged and lengthways extends, the upper part of the body is provided with a containing part, and a containing cavity is formed in the containing part; the plate-shaped main body also comprises a combustion head accommodated in the accommodating cavity and a shell at least covering the accommodating part of the main body; the first fire holes are formed at the top of the combustion head, and the second fire holes are formed in a gap between the accommodating part of the body and the shell.

6. The burner unit of claim 5, wherein: the spoiler is at least partially accommodated in the combustion head to correspond to the plurality of first fire holes.

7. The burner unit of claim 5, wherein: the body is provided with a first air inlet and a second air inlet positioned above the first air inlet at one lengthwise end of the body; wherein the first air inlet is in communication with the first fire hole for supplying a first gas-air mixture and the second air inlet is in communication with the second fire hole for supplying a second gas-air mixture.

8. A gas-fired water heating apparatus, characterized in that the apparatus comprises:

a burner comprising a plurality of burner units as claimed in any one of the preceding claims arranged side by side; and

a heat exchanger to absorb heat generated by the burner and to transfer the heat to a flow of water through the heat exchanger.

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