WO2019218414A1

WO2019218414A1 - Combustor and water heater using same

Info

Publication number: WO2019218414A1
Application number: PCT/CN2018/091102
Authority: WO
Inventors: 陈文风; 孟宪超; 梁国荣
Original assignee: 芜湖美的厨卫电器制造有限公司; 美的集团股份有限公司
Priority date: 2018-05-15
Filing date: 2018-06-13
Publication date: 2019-11-21
Also published as: CN108548178B; EP3795900A4; CN108548178A; EP3795900A1; CN110762526B; CN110762526A

Abstract

A combustor and a water heater using same. The combustor (10) comprises a plurality of distributors (100) which are arranged side by side in the width direction, each distributor (100) comprises at least three ejection tubes (110), and each ejection tube (110) is sequentially provided with an ejection section (110A) and an gas outlet section (110B) along the gas flow direction. Each ejection tube (110) comprises a throat (114) and a diverter (112). The throat (114) is provided at the minimum cross-section of the ejection section (110A), the length of the ejection section (110A) is H1, and the maximum width of the throat (114) allowing gas to pass is D1, wherein 8.5D1 ≤ H1 ≤ 9.5D1. The diverter (112) is provided in the gas outlet section (110B) and has a top corner (112C) for diverting gas to two sides, and the angle of the top corner (112C) is 45 degrees to 85 degrees.

Description

Burner and water heater applying same

The present application claims priority to Chinese Patent Application No. 201810462349.5, filed on May 15, 2018, the entire disclosure of which is incorporated herein by reference. .

Technical field

The invention relates to the technical field of burners, in particular to a burner and a water heater using the same.

Background technique

The water heater or wall-hung boiler is a household appliance that uses domestic gas as the main energy source to provide domestic hot water or home heating. The burner is an important component of a gas water heater and a wall-hung boiler, and is a general term for a device that ejects fuel and air in a certain manner and then mixes and burns. Burners are divided into industrial burners, burners, civil burners and special burners by type and application.

Summary of the invention

In order to solve the technical problem of low combustion efficiency of the burner and more nitrogen oxides generated after combustion in the prior art, the present invention provides a burner and a water heater using the same.

As an aspect of an embodiment of the present invention, an embodiment of the present invention provides a burner including a plurality of firearms, the plurality of firearms are arranged side by side in a width direction, and the firearm includes at least three ejector pipes. The ejector tube sequentially sets an ejector section and an venting section according to a gas flow direction, and the ejector tube comprises:

a throat disposed at a minimum cross section of the ejector section, the length of the ejector section being H1, the maximum width of the throat allowing gas to pass through, wherein 8.5D1 ≤ H1 ≤ 9.5D1;

A flow divider, disposed in the air outlet section, has a top corner portion for diverting gas to both sides, the angle of the top corner portion being 45 degrees to 85 degrees.

Further, the ejector section includes:

a premixing section, the ejector tube having the same cross-sectional shape in the pre-mixing section, the length of the pre-mixing section being H11, wherein 2D1 ≤ H11 ≤ 3D1;

The diffusing section gradually deviates from the central axis of the ejector tube along the gas flow direction, and the length of the diffusing section is H12, wherein 3.5D1 ≤ H12 ≤ 4.5D1.

Further, the ejector section has an inlet end and an outlet end, the maximum width of the inlet end is greater than or equal to the maximum width of the outlet end, and the maximum width of the inlet end is greater than or equal to 18 mm.

Further, the inlet end has an arcuate cross section that is concavely formed from a center of the inlet end toward the outlet end.

Further, 11 mm ≤ D1 ≤ 14 mm.

Further, the length of the gas outlet section is less than or equal to 30% H1.

Further, the burner further includes a gas separation device, the gas separation device is disposed under each of the ejector tubes, the gas separation device defines a plurality of gas passages, and the gas separation device further comprises a nozzle, the gas separation device is in communication with the ejector tube through the nozzle, the diameter of the nozzle is D0, wherein D1=2D0.

Further, the fire extinguisher includes a first housing and a second housing that are symmetrically disposed, and a gas passage of the ejector tube is enclosed by the first housing and the second housing; the shunt The first recess and the second recess are symmetrically disposed, the first recess is formed by the first housing being recessed toward the cavity of the ejector tube, and the second recess is formed by the second housing a cavity of the ejector tube is formed by recessing, and a gas passage is defined between the first recess and the second recess; the fire extinguisher further includes a top plate, which is covered above the ejector tube The top plate is provided with a plurality of fire holes; and the first casing is fastened to the second casing, and the top plate fastens the first casing and the second casing.

Further, the flow divider further includes at least two through holes disposed between the adjacent two of the ejector pipes for passing the cold water pipe and in close contact with the cold water pipe.

As another aspect of an embodiment of the present invention, an embodiment of the present invention also provides a water heater including the burner as described above.

The embodiment of the invention adopts the above technical solution to improve the ejector coefficient and reduce the generation of nitrogen oxides.

The above summary is for the purpose of illustration only and is not intended to be limiting. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the appended claims.

DRAWINGS

1 is a top plan view of a burner of an embodiment of the present invention.

Figure 2 is a front elevational view of the firearm of the burner of the embodiment of the present invention.

Figure 3 is a left side elevational view of two firearms of the burner of the embodiment of the present invention.

Figure 4 is a front elevational view of the burner of the embodiment of the present invention.

Figure 5 is an exploded view of a burner of an embodiment of the present invention.

Description of the reference signs:

10: burner; 100: firearm;

100A: first housing; 100B: second housing; 110: ejector tube;

111A: first diversion ramp; 111B: second diversion ramp; 112: shunt;

112A: first recess; 112B: second recess; 112C: apex;

110A: ejector section; 110B: outlet section; 113: inlet end;

113A: curved section; 114: throat; 115: outlet end;

120: top plate; 121: fire hole; 131: inlet pipe through hole;

132: outlet pipe through hole; 150: spacing positioning mechanism;

151: first convex portion; 152: second convex portion; 160: igniter;

101: a first firearm; 102: a second firearm;

103, 104: two adjacent firearms;

171: first pressure plate; 172: second pressure plate; 180: connecting piece;

191: first fastener; 192: second fastener; 200: cold water pipe;

210: inlet pipe; 220: outlet pipe;

300: gas distribution device; 310: nozzle; 320: valve connection.

Detailed ways

In the following, only certain exemplary embodiments are briefly described. The described embodiments may be modified in various different ways, without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative rather

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Out, Clockwise, Counterclockwise, Axial The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present invention and simplifying the description, and does not indicate or imply the indicated device or The elements must have a particular orientation, are constructed and operated in a particular orientation and are therefore not to be construed as limiting.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connection, electrical connection, or communication; can be directly connected, or indirectly connected through an intermediate medium, can be the internal connection of two components or the interaction of two components . For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. It is not in direct contact but through additional features between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly above and above the second feature, or merely the first feature level being less than the second feature.

The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and arrangements of the specific examples are described below. Of course, they are merely examples and are not intended to limit the invention. In addition, the present invention may be repeated with reference to the numerals and/or reference numerals in the various examples, which are for the purpose of simplicity and clarity, and do not indicate the relationship between the various embodiments and/or arrangements discussed.

1 is a top view of the burner 10 of the present embodiment. The burner 10 of the present embodiment includes a plurality of fire extinguishers 100 and a cold water pipe 200 extending through the plurality of fire extinguishers 100. The plurality of fire extinguishers 100 are along the fire extinguisher 100. The width direction of the cold water pipe 200 is U-shaped, including the inlet pipe 210 and the outlet pipe 220 to drain water on the same side of the burner 10. Preferably, the cold water pipe 200 is integrally formed.

2 is a front view of one of the fire extinguishers 100. The fire extinguisher 100 of the present embodiment includes three ejector tubes 110 and two through holes (a water inlet hole 131 and a water outlet hole 132), wherein Both ends of the cold water pipe 200 are respectively passed through the corresponding through holes, that is, the inlet pipe through holes 131 are used for the inlet pipe 210 to pass through, and are in close contact with the inlet pipe 210, and the outlet pipe through holes 132 are used for the outlet pipe 220 to pass through. And in close contact with the outlet pipe 220.

As shown in FIG. 3, which is a left side view of two

adjacent fire extinguishers

103 and 104, please refer to FIG. 1 and FIG. 2 together. In this embodiment, the fire extinguisher 100 can be engaged with the second housing by the first housing 100A. 100B is formed, that is, the gas passage of the ejector tube 100 is surrounded by the first casing 100A and the second casing 100B, and the inlet pipe through hole 131 and the outlet pipe through hole 132 penetrate the first casing 100A and the second casing 100B. The firearm 100 further includes a top plate 120 that is capped over the three ejector tubes 110 and has a plurality of fire holes 121.

Referring to FIG. 2 and FIG. 3, each of the ejector tubes 110 sequentially sets an ejector section 110A and an outlet section 110B according to a gas flow direction, wherein the ejector section 110A has an inlet end 113, a throat 114 and an outlet end 115, and an ejector tube The gas is directed upwardly from the inlet end 113, through the throat 114 and the outlet section 110B, and then discharged from the fire hole 121 and ignited by the igniter 160 (in conjunction with FIG. 2) to form a flame. In order to avoid the flame caused by the excessive jet force of the airflow being too high, the end face of the outlet section 110B of the ejector tube 110 is inclined to both sides to form a flow guiding slope (including the first flow guiding slope 111A and the rightward inclined to the left side) The second inclined flow guiding slope 111B).

The throat 114 is disposed at a minimum cross-section of the exit section 110A, i.e., the gas has a minimum passage area at the throat 114. The maximum width of the throat 114 allowing gas to pass is D1. For example, when the cross-sectional shape of the throat 114 is circular, the maximum width D1 is the diameter of the throat 114; when the cross-sectional shape of the throat 114 is rectangular, the maximum width D1 is the longest diagonal of the throat 114.

Reducing the maximum width D1 of the throat 114 can reduce the size of the firearm 100. Increasing the length H1 of the ejector section 110A and the maximum width D1 of the throat 114 can reduce the energy loss coefficient, thereby increasing the ejector coefficient and allowing gas and air. The mix is more even. Experiments show that when H1=6D1, the energy loss coefficient of the burner is about 2.2; when H1=8D1, the energy loss coefficient of the burner is about 1.8; when 8.5D1≤H1≤9.5D1, the combustion The energy loss coefficient of the ejector is about 1.5. Decreasing the energy loss coefficient is beneficial to increase the ejector coefficient. When the ejector coefficient is increased, the volume of the actual combustion product will increase, resulting in a sharp drop in the combustion temperature, which in turn can reduce the thermal oxidation reaction to reduce the emission of nitrogen oxides ( The thermal oxidation reaction refers to the oxidation of nitrogen and oxygen in the air at high temperature to form nitrogen oxides. Experiments show that the oxidation reaction rate increases exponentially as the reaction temperature increases.

Preferably, the ejector section 110A includes a premixing section 110A1 and a diffusing section 110A2, the ejector tube 110 has the same cross-sectional shape in the premixing section 110A1, and the length of the premixing section 110A1 is H11, wherein 2D1 ≤ H11 ≤ 3D1; The diffusing section 110A2 gradually deviates from the central axis of the ejector tube 110 in the gas flow direction, and the length of the diffusing section 110A2 is H12, wherein 3.5D1 ≤ H12 ≤ 4.5D1.

Further, the length H2 of the outlet section 110B is ≤ 30% H1 to reduce the size of the fire extinguisher 100.

Preferably, 11 mm ≤ D1 ≤ 14 mm, and the cross-sectional area of the gas passage formed by each of the fire extinguishers 100 at the throat 114 is 33 mm 2 to 42 mm 2 . Therefore, increasing the number of the ejector tubes is advantageous for reducing the maximum width of the throat 114 . To reduce the size of the firearm 100. It should be noted that in the present embodiment, the number of the ejector tubes 110 may be three or more than three, and the number of the ejector tubes 110 may increase the ejector coefficient, thereby increasing the amount of the ejector gas.

Further, the maximum width D2 of the inlet end 113 is greater than or equal to the maximum width D3 of the outlet end 115, preferably, D2 = D3, and the center of the inlet end 113 is recessed toward the outlet end 115 to form an arcuate section 113A, as shown in FIG. It is shown that the inlet end 113 of such a large rounded design allows for a smoother flow of gas and increases the amount of air that is injected through the gas, preferably D2 > 18 mm.

As shown in FIG. 2 and FIG. 3, the ejector tube 110 further has a flow divider 112 including a first recess 112A and a second housing 100B which are formed by recessing the first housing 100A toward the cavity of the ejector tube 110. The cavity of the tube 110 is recessed to form a second recess 112B. The flow divider 112 is for dividing the gas, and even if a part of the gas is affected by the resistance of the flow divider 112, it is branched to both sides of the ejector tube 110, ejected from the fire holes 121 corresponding to both sides of the ejector tube 110, and then burned to form The other portion of the gas is vertically upward from the gas passage between the first recess 112A and the second recess 112B, ejected from the fire hole 121 corresponding to the center of the ejector tube 110, and then burned to form a flame.

The angle α of the apex portion 112C of the flow divider 112 is preferably 45 degrees (°) to 85°, that is, the split angle of the apex portion 112C for diverting gas to both sides thereof is preferably 45° to 85° to reduce the gas. Resistance to flow.

4 and 5 respectively show a front view and an exploded view of the burner 10, that is, a view when the plurality of fire extinguishers 100 are combined. In the present embodiment, the burner 10 further includes a gas separation device 300, which is disposed at each Below the ejector tube 110, a gas passage is defined in the gas separation device 300, and communicates with the ejector tube 110 through a plurality of nozzles 310. When the burner 10 is in operation, the gas valve connected to the valve connector 320 is opened, and the gas enters the ejector tube 110 through the nozzle 310. The diameter D0 of the nozzle 310 is smaller than the maximum width D1 of the throat 114, preferably, D1 = 2D0, More gas is injected into the ejector tube 110, which increases the ejector coefficient and reduces the production of nitrogen oxides.

Preferably, in this embodiment, the inlet pipe through hole 131 and the outlet pipe through hole 132 are respectively located between the adjacent two ejector pipes 110, and the tops of the inlet pipe through hole 131 and the outlet pipe through hole 132 are preferably disposed at the same horizontal plane. The top E1 of the inlet pipe through hole 131 should be higher than the bottom portion E2 of the flow divider 112 so that the position of the cold water pipe 200 is close to the top plate 120, thereby improving the cooling efficiency and reducing the generation of nitrogen oxides.

In the present embodiment, the burner 10 is of an upright structure. After the gas is ejected from the nozzle 310, the direction of the airflow is also vertical. The gas and air are mixed in the ejector tube 110 and then ignited in the fire hole 121. The end 113 can illuminate more gas, while reducing the diameter of the throat 114. Increasing the length of the ejector section 110A can make the gas mixing more uniform while reducing the size of the firearm 100. The design of at least three ejector tubes not only increases the amount of ejector gas, but also increases the number of corresponding nozzles 310, further increases the ejector coefficient and reduces the generation of nitrogen oxides. Experiments have shown that the flow path design of this embodiment can reduce the emission of nitrogen oxides from 80 ppm (number of particles per cubic centimeter) to 20 ppm.

Further, the fire extinguisher 100 further includes a spacing positioning mechanism 150 disposed outside the ejector tube 110. Each of the spacing positioning mechanisms 150 includes a first convex portion 151 and a second convex portion 152 symmetrically disposed, wherein the first convex portion 151 The first housing 100A is formed to protrude toward the outside of the ejector tube 110, and the second convex portion 152 is formed by the second housing 100B protruding toward the outside of the ejector tube 110.

As shown in FIG. 3, the distance between the first convex portion 151 and the second convex portion 152 is D5, and the outer diameter of the inlet end 113 of the ejector tube 110 is D4, where D4 is equal to D5, thereby making the adjacent two points The side walls of the inlet end 113 of the

firearms

103 and 104 can be offset, and the spacing positioning mechanism 150 of the adjacent two

firearms

103 and 104 can be offset, that is, the first convex portion 151 of the firearm 103 and the second portion of the fire extinguisher 104. The convex portion 152 abuts.

It should be noted that the number of the spacing and positioning mechanisms 150 is not limited in this embodiment. For example, one spacing positioning mechanism 150 may be disposed outside one of the guiding tubes 110, or one spacing may be disposed outside each of the guiding tubes 110. Agency 150. As long as the side walls of the inlet ends of the adjacent two fire extinguishers 100 can be abutted, and the spacing positioning mechanisms 150 of the adjacent two fire extinguishers can be offset.

In the present embodiment, the spacing positioning mechanism 150 can make the fixing between the plurality of fire extinguishers 100 more secure, reducing sway or vibration, thereby reducing the noise generated by the burner 10 during operation.

Further, as shown in FIG. 4 and FIG. 5, the plurality of fire extinguishers 100 include a first fire extinguisher 101 and a second fire extinguisher 102 arranged at the end of the burner 10, and the burner 10 further includes a first pressure plate 171, The second pressure plate 172, the connecting member 180, the first fastener 191 and the second fastener 192. Wherein, the first pressing plate 171 is located outside the first fire extinguisher 101, the second pressing plate 172 is located outside the second fire extinguisher 102; the connecting member 180 sequentially passes through the first pressure plate 171, the respective fire extinguishers 100 and the second pressure plate 172; The connecting member 180 is fastened to the first pressing plate 171 by the first fastener 191, and the connecting member 180 is fastened to the second pressing plate 172 by the second fastening member 192, so that the first pressing plate 171 and the second pressing plate 172 are connected. The respective fire extinguishers 100 are pressed from both ends of the burner 10. Preferably, in the present embodiment, the connecting member 180 may be a double-ended screw, and the first fastener 191 and the second fastening member 192 may be bolts.

As another aspect of the embodiment of the present invention, the embodiment further provides a flue gas water heater comprising the combustor according to the above embodiment. Other configurations of the gas water heater of the present embodiment can be applied to various technical solutions that are known to those skilled in the art now and in the future, and will not be described in detail herein. Since the flue gas water heater of the present embodiment adopts the burner 10 as described above, it is possible to illuminate a sufficient amount of gas without the fan, thereby increasing the ejector coefficient and reducing the generation of nitrogen oxides.

As another aspect of the embodiment of the present invention, the present embodiment further provides a fireplace comprising the burner according to the above embodiment. Other configurations of the wall-hung boiler of the present embodiment can be applied to various technical solutions that are known to those skilled in the art now and in the future, and will not be described in detail herein.

The above is only a preferred embodiment of the present invention, and it should be noted that the above-described preferred embodiments are not to be construed as limiting the scope of the invention, and the scope of the invention should be determined by the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and scope of the invention.

Claims

A burner comprising a plurality of firearms, the plurality of firearms being arranged side by side in a width direction, the firearm comprising at least three ejector pipes, the ejector pipes being sequentially arranged in a gas flow direction a jetting section and an outlet section, the ejector tube comprising:

a throat disposed at a minimum cross section of the ejector section, the length of the ejector section being H1, the maximum width of the throat allowing gas to pass through, wherein 8.5D1 ≤ H1 ≤ 9.5D1;

A flow divider, disposed in the air outlet section, has a top corner portion for diverting gas to both sides, the angle of the top corner portion being 45 degrees to 85 degrees.
The burner of claim 1 wherein said ejector section comprises:

a premixing section, the ejector tube having the same cross-sectional shape in the pre-mixing section, the length of the pre-mixing section being H11, wherein 2D1 ≤ H11 ≤ 3D1;

The diffusing section gradually deviates from the central axis of the ejector tube along the gas flow direction, and the length of the diffusing section is H12, wherein 3.5D1 ≤ H12 ≤ 4.5D1.
The burner according to claim 1, wherein said ejector section has an inlet end and an outlet end, said inlet end having a maximum width greater than or equal to said outlet end maximum width, and said inlet end maximum width being greater than or equal 18mm.
A burner according to claim 3, wherein said inlet end has an arcuate section formed concavely from a center of said inlet end toward said outlet end.
A burner according to claim 1 wherein 11 mm ≤ D1 ≤ 14 mm.
The burner according to claim 1, wherein the length of the outlet section is less than or equal to 30% H1.
The burner according to claim 1, wherein the burner further comprises a gas separation device, the gas separation device is disposed under each of the ejector tubes, and the plurality of gas separation devices define a plurality of a gas passage, the gas separation device further comprising a plurality of nozzles, wherein the gas separation device is in communication with the ejector tube through the nozzle, the nozzle having a diameter D0, wherein D1=2D0.
The burner according to any one of claims 1 to 7, wherein the fire extinguisher comprises a first housing and a second housing that are symmetrically disposed, the gas passage of the ejector tube being a housing and the second housing; the diverter includes a first recess and a second recess symmetrically disposed, the first recess being recessed by the first housing toward a cavity of the ejector tube Forming, the second recess is formed by the second housing recessed toward the cavity of the ejector tube, and a gas passage is defined between the first recess and the second recess; the firearm a top plate is further disposed above the ejector tube, the top plate is provided with a plurality of fire holes; and the first casing is fastened to the second casing, and the top plate is fastened to the first a housing and the second housing.
The burner according to any one of claims 1 to 7, wherein the flow divider further comprises at least two through holes, the through holes being disposed between two adjacent of the ejector tubes, The cold water pipe passes through and is in close contact with the cold water pipe.
A water heater characterized by comprising the burner according to any one of claims 1 to 9.