CN212930446U

CN212930446U - Burner assembly and gas water heating equipment using same

Info

Publication number: CN212930446U
Application number: CN201922503836.4U
Authority: CN
Inventors: 杨威武; 杨晓东; 史迎花
Original assignee: Vaillant Wuxi Heating Equipment Co Ltd
Current assignee: Vaillant Wuxi Heating Equipment Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-04-09
Anticipated expiration: 2029-12-27

Abstract

The utility model provides a combustor subassembly and gas hot water system who uses this combustor subassembly. The burner assembly includes a plurality of burner units and a wind deflector. The combustor comprises a plurality of combustor units, a plurality of fuel air mixing chambers and a plurality of burner units, wherein the combustor units are arranged side by side in the transverse direction, each combustor unit is vertically arranged and comprises an air inlet hole, a plurality of fire holes and a fuel air mixing chamber, the air inlet hole is located at the lower portion of the combustor units, the fire holes are distributed at the top of the combustor units along the longitudinal direction of the combustor units, the fuel air mixing chambers are connected with the air inlet. The wind shield extends along the transverse direction and is arranged at the front side of the air inlets of the plurality of burner units, air inlets corresponding to the air inlets of each burner unit are formed in the wind shield, at least one transverse side of each air inlet extends along the vertical straight direction, and the plurality of air inlets are non-uniformly arranged in size. The burner can effectively reduce the emission of nitrogen oxides and ensure good combustion effect, and the improvement on the structure of the existing burner is reduced as much as possible.

Description

Burner assembly and gas water heating equipment using same

Technical Field

The utility model relates to a hot water preparation field especially relates to a burner assembly and gas hot water equipment who uses this burner assembly.

Background

Gas-fired water heating apparatuses generally include a gas water heater and a gas boiler. Taking a gas water heater as an example, a burner, a heat exchanger, and a piping system are generally disposed therein. The burner often includes a plurality of fire row sheets arranged side by side, each fire row sheet has a gas-air mixing channel, gas and air can be mixed in the fire row sheet and transferred to fire holes at the top of the fire row sheet to be combusted in the combustion chamber and generate heat, the generated heat can heat water in the heat exchanger, and then the heated water can be output through a pipeline system to meet the supply requirement of domestic hot water for drinking, bathing and the like. The gas boiler can be used for providing domestic hot water and can also be communicated with a radiator arranged indoors to provide a central heating function.

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). In the established nitrogen oxide emission labels of civil gas appliances in China, the highest level, namely the national standard five level, requires that the upper limit of the concentration of nitrogen oxide is 70 milligrams/kilowatt-hour (mg/kW.h). The nitrogen oxide emission of the gas water heating equipment on the market is about 180 mg/kilowatt hour, namely, the requirement of three-level emission can not be met. The measures widely adopted at present for reducing the emission of nitrogen oxides in civil gas appliances include the use of thick and thin combustion burners, water-cooled burners, and even direct production of condensation products. Obviously, these measures necessitate substantial modifications to the existing burner, or even the construction of the entire product, which will undoubtedly add considerably to the design and manufacturing costs of the product.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a burner assembly, it can ensure good combustion effect again when effectively reducing nitrogen oxide's emission to reduce the transformation to current burner structure as far as possible.

An object of the utility model is also to provide an use gas hot water system of above-mentioned combustor subassembly.

To achieve one of the above objects, the present invention provides a burner assembly including a plurality of burner units and a windshield. The combustor comprises a plurality of combustor units, a plurality of fuel air mixing chambers and a plurality of burner units, wherein the combustor units are arranged side by side in the transverse direction, each combustor unit is vertically arranged and comprises an air inlet hole, a plurality of fire holes and a fuel air mixing chamber, the air inlet hole is located at the lower portion of the combustor units, the fire holes are distributed at the top of the combustor units along the longitudinal direction of the combustor units, the fuel air mixing chambers are connected with the air inlet. The wind shield extends along the transverse direction and is arranged at the front side of the air inlets of the plurality of burner units, air inlets corresponding to the air inlets of each burner unit are formed in the wind shield, at least one transverse side of each air inlet extends along the vertical straight direction, and the plurality of air inlets are non-uniformly arranged in size.

As a further improvement of the utility model, the total of the air intake area of the transverse side is larger than the total of the air intake area of the transverse opposite side.

As a further improvement of the present invention, at least one maximum air inlet is provided in the plurality of air inlets, and the maximum air inlet is close to the central position of the wind shield.

As a further improvement of the utility model, at least one maximum size air intake has two and is linked together.

As a further improvement of the present invention, the area of the inlet port of each burner unit is larger than the area of the at least one maximum size air inlet.

As a further improvement of the present invention, the area distribution of the plurality of air inlets is gradually enlarged along the horizontal direction.

As a further improvement of the present invention, a plurality of fire holes of each burner unit are provided with two rows in the lateral direction and inclined downward from both ends toward the center.

To achieve the above another object, the present invention provides a gas water heater, which includes the above burner assembly and a heat exchanger. Wherein the heat exchanger is disposed above the burner assembly to allow hot flue gases from the combustion to pass therethrough and transfer heat to the heat exchanger.

As a further improvement of the utility model, the device further comprises a smoke collecting hood positioned above the heat exchanger, and the smoke collecting hood is arranged asymmetrically on the transverse direction.

As a further improvement of the utility model, the smoke collecting cover is provided with a horizontal part and a vertical part, wherein the horizontal part and the vertical part are defined together with an included angle space for accommodating the fan.

Compared with the prior art, the beneficial effects of the utility model are that: by adjusting the shape of the air inlet holes of the burner units, the transverse thickness of the burner units can be made very thin, so that more burner units can be distributed on the same transverse size, and the load of each burner unit can be reduced. The output load range of each combustor unit is 0.8-2 kilowatts before modification, and the output load range of each combustor unit can be reduced to 0.4-1.4 kilowatts after modification. In addition, the size of each air inlet on the wind shield is adjusted to ensure that the air quantity entering each burner unit is kept consistent, so that the gas entering each burner unit can be fully combusted. Finally, the emission of nitrogen oxides is lower than 100 mg/kilowatt hour through the modification and adjustment of the burner assembly, and the requirement of 4-level emission specified in the national standard GB25034 of the gas heating water heater is met.

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 front plan view of a gas fired water heater apparatus of the present invention with a front panel removed in one embodiment, with parts omitted;

FIG. 2 is an exploded perspective view of a burner assembly of the gas-fired water heating apparatus shown in FIG. 1;

FIG. 3 is a schematic plan view of a wind deflector in the burner assembly shown in FIG. 2;

fig. 4 is a perspective view of a burner unit in the burner assembly shown in fig. 2.

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.

The gas water heater can be a gas water heater which uses combustible gas as fuel, such as natural gas, city gas, liquefied gas, methane and the like, heats water by burning the combustible gas to meet the requirement of domestic water of users, and can also be a gas boiler for central heating.

Referring to fig. 1, a gas-fired water heating apparatus according to an embodiment of the present invention is shown. The gas water heater includes a housing 10, a burner assembly 20, a heat exchanger 30, a hood 40, a fan (not shown), and the like, which are accommodated in the housing 10.

In the present embodiment, the housing 10 is substantially rectangular, and may be formed by joining a plurality of panels. The burner assembly 20 generally includes several burner units 21 disposed laterally side by side within a burner housing. The heat exchanger 30 is mounted above the burner assembly 20, defining a combustion chamber therebetween. The heat exchanger 30 may be a finned tube heat exchanger, i.e., a heat exchanger housing having a plurality of fins through which a heat absorbing water tube is circuitously passed. The gas-air mixture is combusted in the combustion chamber, heat carried by the generated hot flue gas is absorbed by the fins and further transferred to water flowing through the heat absorption water pipe, and the heated water is discharged through the pipe, so that water required for life and/or heating is provided for users. The smoke collecting hood 40 is disposed above the heat exchanger 30, and collects flue gas (exhaust gas containing carbon monoxide, nitrogen oxides, etc.) generated by combustion and discharges the flue gas to the outside. In this embodiment, the fume collecting hood 40 has a horizontal portion and a vertical portion along the direction of fume exhaust, and the horizontal portion and the vertical portion define an included angle space together to accommodate the fan. It can be seen that the fume collecting hood 40 is arranged asymmetrically in the transverse direction, which results in an uneven distribution of the airflow driven by the fan in the transverse direction of the combustion chamber.

As shown in fig. 2 to 4, each burner unit 21 is vertically disposed and includes an air inlet hole 211 at a lower portion, a plurality of fire holes 212 at a top portion and distributed in a longitudinal direction perpendicular to a transverse direction, and a fuel-air mixing chamber 213 connecting the air inlet hole 211 and the plurality of fire holes 212. Wherein at least one lateral side of the air intake holes 211 extends straight vertically, and in the present embodiment, both lateral sides 2111 of each air intake hole 211 extends straight vertically. By this arrangement, more burner units can be arranged within the same lateral dimension. The fire holes 212 of each burner unit 21 are arranged in two rows in the lateral direction and extend obliquely downward from both ends toward the center. With this arrangement, more fire holes can be arranged at the top of the burner unit 21. The air distribution frame 22 can be fixedly installed on the burner housing, and a plurality of nozzles (not shown) are disposed on the air distribution frame 22 and can respectively correspond to the air inlet holes 211 of the burner units 21. The gas-distributing frame 22 is usually connected to a gas-conveying line. The gas delivered through the gas delivery pipe passes through the gas distribution frame and is injected into the corresponding gas inlet holes 211 through the nozzles, and simultaneously, the air is driven by the injection gas flow of the gas to enter the gas inlet holes 211 together. Gas and air are mixed in the mixing chamber 213 and transferred to the fire holes 212 at the top of the unit to burn and generate heat.

And the wind shield 23 is arranged between the air distribution frame 22 and the plurality of burner units 21, extends along the transverse direction, is abutted against the front sides of the air inlet holes 211 of the plurality of burner units, and is provided with

air inlets

231, 232, 233 and 234 corresponding to the air inlet holes 211 of each burner unit. The air intakes of the air deflector 23 are substantially congruent with the shape of the air intake holes 211 of the burner unit 21, i.e. at least one lateral side of each air intake extends vertically straight, in this embodiment substantially both lateral sides of each air intake extend vertically straight. The sizes of the plurality of air inlets distributed along the transverse direction are non-uniformly arranged. As previously indicated, since the exhaust fume collecting hood 40 is asymmetrically distributed in the lateral direction, the airflow under the fan driving, particularly, the intensity distribution in the lateral direction in the combustion chamber is not uniform. Since the amount of air injected into the air inlet holes 211 of the burner unit by each nozzle is constant, the air quantity entering each air inlet hole 211 is ensured to be consistent by adjusting the size of the air inlet of the wind shield 23, thereby balancing the uneven air inflow caused by the strength of the transverse airflow.

As shown in fig. 3, in the present embodiment, the area distribution of the plurality of air inlets tends to gradually increase from the one end air inlet 231 to the other end air inlet 232. The area of each air inlet on the side where the air inlet 232 is located is larger than the area of each air inlet on the side where the air inlet 231 is located. Wherein, the plurality of air inlets have at least one air inlet with the largest size, and the air inlet is arranged close to the central position of the wind shield 23. This is because the air required for combustion enters from a flue pipe (not shown) at the top of the apparatus, then flows down the inner wall around the outer casing 10, and gushes into the burner from both sides of the bottom of the burner. Thus, the air entering the burner assembly 2 is at the redundant center of the sides, and therefore the area of the air intakes 233, 234 near the center is maximized to further ensure a consistent amount of air entering each burner unit. In this embodiment, the largest size air inlet has two 233, 234 air inlets, which are connected together. The area of the intake ports 211 of each burner unit is larger than the area of the largest-

sized intake ports

233, 234.

By adjusting the shape of the air inlet holes of the burner units, the transverse thickness of the burner units can be made very thin, so that more burner units can be distributed on the same transverse size, and the load of each burner unit can be reduced. The output load range of each combustor unit is 0.8-2 kilowatts before modification, and the output load range of each combustor unit can be reduced to 0.4-1.4 kilowatts after modification. In addition, the size of each air inlet on the wind shield is adjusted to ensure that the air quantity entering each burner unit is kept consistent, so that the gas entering each burner unit can be fully combusted. Finally, the emission of nitrogen oxides is lower than 100 mg/kilowatt hour through the modification and adjustment of the burner assembly, and the requirement of 4-level emission specified in the national standard GB25034 of the gas heating water heater is met.

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

1. A burner assembly, comprising:

the burner comprises a plurality of burner units which are arranged side by side along the transverse direction, wherein each burner unit is vertically arranged and comprises an air inlet hole positioned at the lower part, a plurality of fire holes positioned at the top and distributed along the longitudinal direction, and a fuel-air mixing cavity for connecting the air inlet hole and the fire holes, wherein at least one transverse side of the air inlet hole extends along the vertical straight direction;

the wind shield extends along the transverse direction and is arranged on the front sides of the air inlets of the plurality of burner units, a plurality of air inlets are formed in the wind shield, each air inlet corresponds to the air inlet of each burner unit, at least one transverse side of each air inlet extends along the vertical straight direction, and the plurality of air inlets are non-uniformly arranged in size.

2. The burner assembly of claim 1, wherein: the sum of the areas of the air inlets on one transverse side is larger than that of the air inlets on the other transverse side.

3. The burner assembly of claim 1 or 2, wherein: the air inlets are provided with at least one air inlet with the largest size, and the air inlet with the largest size is close to the central position of the wind shield.

4. The burner assembly of claim 3, wherein: and two air inlets with the maximum size are connected together.

5. The burner assembly of claim 3, wherein: the area of the air inlet hole of each burner unit is larger than the area of the at least one largest-size air inlet.

6. The burner assembly of claim 1 or 2, wherein: the area distribution of the plurality of air inlets is gradually enlarged along the transverse direction.

7. The burner assembly of claim 1, wherein: and the fire holes of each burner unit are transversely provided with two rows and obliquely extend downwards from two ends to the center.

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

the burner assembly of any one of claims 1 to 7;

a heat exchanger disposed above the burner assembly to allow hot flue gases from combustion to pass therethrough and transfer heat to the heat exchanger.

9. The gas-fired water heating apparatus according to claim 8, wherein: the apparatus also includes a fume collection hood located above the heat exchanger, the fume collection hood being asymmetrically arranged in a lateral direction.

10. The gas-fired water heating apparatus according to claim 9, wherein: the smoke collecting cover is provided with a horizontal part and a vertical part, and the horizontal part and the vertical part define an included angle space together to accommodate the fan.