CN110762526A

CN110762526A - Combustor and water heater using same

Info

Publication number: CN110762526A
Application number: CN201911063413.3A
Authority: CN
Inventors: 陈文风; 孟宪超; 梁国荣
Original assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Smart Kitchen Appliance Manufacturing Co Ltd
Priority date: 2018-05-15
Filing date: 2018-05-15
Publication date: 2020-02-07
Anticipated expiration: 2038-05-15
Also published as: CN108548178B; CN108548178A; EP3795900A4; WO2019218414A1; CN110762526B; EP3795900A1

Abstract

The invention provides a burner and a water heater using the same, wherein the burner comprises a plurality of fire distributors and cold water pipes penetrating through the fire distributors, the fire distributors are distributed side by side along the width direction of the fire distributors, each fire distributor comprises at least three injection pipes, and each cold water pipe comprises a water inlet pipe and a water outlet pipe so as to discharge water on the same side of the burner; the distributor comprises a water inlet pipe through hole for the water inlet pipe to pass through and a water outlet pipe through hole for the water outlet pipe to pass through, and the water inlet pipe through hole and the water outlet pipe through hole are respectively arranged between the two adjacent injection pipes. The combustor provided by the embodiment of the invention can improve the cooling efficiency and reduce the generation of nitrogen oxides.

Description

Combustor and water heater using same

The application is a divisional application of a prior application (title of the invention: burner and water heater using the same; application date: 2018, 5, month and 15; application number: 201810462349.5).

Technical Field

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

Background

The water heater or the wall-mounted boiler is a household device which takes gas as main energy and provides domestic hot water or household heating. The burner is an important part of a gas water heater and a wall-hanging stove, and is a general term for a device that injects fuel and air in a certain manner and then combusts in a mixed manner. The burners are classified into industrial burners, civil burners and special burners according to types and application fields.

There are two kinds of burners commonly used in the prior art, one is a rich-lean burner, and the other is a water-cooled burner, as shown in fig. 1, a distributor used in the water-cooled burner in the prior art is provided, a plurality of distributors are distributed side by side to form a main part of the burner, and the distributor has two injection pipes 1 to inject gas from below, and discharge the gas from a fire hole 3 above, and are ignited to form a flame. And a water inlet pipe through hole 4 and a water outlet pipe through hole 5 are formed in the outer sides of the two injection pipes 1 and are respectively used for enabling a water inlet pipe and a water outlet pipe of a cold water pipe to pass through so as to cool the combustor. Because inlet tube through-hole 4 and outlet pipe through-hole 5 are established in both sides, make two draw and penetrate the pipe and need design placed in the middle, cause the special-shaped structure of runner to lead to drawing the gaseous resistance increase of penetrating, combustion efficiency reduces, and the nitrogen oxide that produces after the burning is more.

Disclosure of Invention

Embodiments of the present invention provide a burner and a water heater using the same, so as to solve or alleviate one or more technical problems in the prior art.

As an aspect of an embodiment of the present invention, an embodiment of the present invention provides a combustor, including a plurality of distributors and a cold water pipe penetrating through the plurality of distributors, the plurality of distributors being distributed side by side along a width direction of the distributors, the distributors including at least three injection pipes, the cold water pipe including a water inlet pipe and a water outlet pipe to discharge water on a same side of the combustor; the distributor comprises a water inlet pipe through hole for the water inlet pipe to pass through and a water outlet pipe through hole for the water outlet pipe to pass through, and the water inlet pipe through hole and the water outlet pipe through hole are respectively arranged between the two adjacent injection pipes.

In an embodiment, the distributor includes first casing and the second casing that the symmetry set up, draws the gas passage of penetrating the pipe and is enclosed by first casing and second casing, and the distributor still includes the roof of connecting in first casing and second casing top.

In one embodiment, the top of the inlet pipe through hole and the top of the outlet pipe through hole are arranged on the same horizontal plane.

In an embodiment, draw the pipe and set gradually according to the gas flow direction and draw section and the section of giving vent to anger, set up the shunt on the section of giving vent to anger, the shunt has the apex angle portion that is used for making gas to the reposition of redundant personnel of both sides.

In one embodiment, the top of the inlet pipe through hole is higher than the bottom of the diverter.

In one embodiment, the burner further comprises a spacing positioning mechanism arranged on the outer shell of the fire divider, and the spacing positioning mechanism at least comprises a first convex part or a second convex part arranged on the first shell or the second shell of two adjacent fire dividers.

In one embodiment, the burner further comprises a first pressure plate and a second pressure plate disposed at both ends of the plurality of distributors; the first pressing plate and the second pressing plate are respectively positioned on the outer sides of two end parts of the plurality of igniters.

In one embodiment, the burner further comprises a connector disposed through the first pressure plate, the plurality of distributors, and the second pressure plate.

In one embodiment, the burner further comprises at least one fastener for fastening the first pressure plate, the second pressure plate and the connecting member.

As another aspect of the embodiments of the present invention, there is also provided a water heater including the burner as described above.

By adopting the technical scheme, the embodiment of the invention can improve the cooling efficiency and reduce the generation of nitrogen oxides.

The foregoing summary is provided for the purpose of description only and is not intended to be limiting in any way. 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 drawings and following detailed description.

Drawings

In the drawings, like reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily to scale. It is appreciated that these drawings depict only some embodiments in accordance with the disclosure and are therefore not to be considered limiting of its scope.

Fig. 1 is a front view of a distributor of a burner according to the prior art.

Fig. 2 is a top view of a burner according to an embodiment of the present invention.

Fig. 3 is a front view of a distributor of a burner according to an embodiment of the present invention.

Fig. 4 is a left side view of two igniters of the burner of the embodiment of the present invention.

Fig. 5 is a front view of a burner according to an embodiment of the present invention.

Fig. 6 is an exploded view of a burner according to an embodiment of the present invention.

Description of reference numerals:

the prior art is as follows:

1: an injection pipe; 2: a flow divider; 3: fire holes; 4: a water inlet pipe through hole; 5: the water outlet pipe is provided with a through hole.

The embodiment of the invention comprises the following steps:

10: a burner; 100: a fire divider;

100A: a first housing; 100B: a second housing; 110: an injection pipe;

111A: a first diversion inclined plane; 111B: a second diversion inclined plane; 112: a flow divider;

112A: a first recess; 112B: a second recess; 112C: a vertex angle portion;

110A: an injection section; 110B: an air outlet section; 113: an inlet end;

113A: an arc-shaped cross section; 114: a throat; 115: the outlet end of the injection section;

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

132: a water outlet pipe through hole; 200: a cold water pipe;

210: a water inlet pipe; 220: a water outlet pipe;

300: a gas distribution device; 310: a nozzle; 320: a valve connector.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined 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; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. 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, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Referring to fig. 2, which is a top view of the burner 10 of the present embodiment, the burner 10 of the present embodiment includes a plurality of distributors 100 and a cold water pipe 200 penetrating through the plurality of distributors 100, the plurality of distributors 100 are distributed side by side along a width direction of the distributors 100, the cold water pipe 200 is a U-shaped pipe including a water inlet pipe 210 and a water outlet pipe 220 to discharge water on the same side of the burner 10, and preferably, the cold water pipe 200 is integrally formed.

As shown in fig. 3, which is a front view of one of the fire dividers 100, the fire divider 100 of the present embodiment includes 3

injector pipes

110 and 2 through holes (a water inlet pipe through hole 131 and a water outlet pipe through hole 132), wherein two ends of the cold water pipe 200 respectively pass through the corresponding through holes, that is, the water inlet pipe through hole 131 is used for passing the water inlet pipe 210 and is in close contact with the water inlet pipe 210, and the water outlet pipe through hole 132 is used for passing the water outlet pipe 220 and is in close contact with the water outlet pipe 220.

As shown in fig. 4, which is a left side view of two

adjacent fire distributors

103 and 104, please refer to fig. 2 and fig. 3, in this embodiment, the fire distributor 100 may be formed by fastening a first casing 100A to a second casing 100B, that is, a gas passage of the ejector pipe 100 is enclosed by the first casing 100A and the second casing 100B, and a water inlet pipe through hole 131 and a water outlet pipe through hole 132 penetrate through the first casing 100A and the second casing 100B. The fire distributor 100 further comprises a top plate 120 covering the upper parts of the 3 injection pipes 110 and provided with a plurality of fire holes 121.

Referring to fig. 3 and 4, each injection pipe 110 is sequentially provided with an injection section 110A and an air outlet section 110B according to the gas flow direction, wherein the injection section 110A has an inlet end 113, a throat 114 and an outlet end 115, the injection pipe 110 vertically injects gas upwards from the inlet end 113, passes through the throat 114 and the air outlet section 110B, and is then discharged from the fire hole 121 and ignited by the igniter 160 to form a flame. In order to avoid too high flame caused by excessive jet force of the air flow, the end surface of the air outlet section 110B of the injection pipe 110 is inclined towards two sides to form a diversion inclined plane (including a first diversion inclined plane 111A inclined towards the left side and a second diversion inclined plane 111B inclined towards the right side).

The throat 114 is disposed at the smallest cross-section of the induction section 110A, i.e., the gas has the smallest passing area at the throat 114. The maximum width D1 of the throat 114 that allows gas to pass through, 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 reduces the size of the distributor 100, and increasing the length H1 of the induction section 110A and the maximum width D1 of the throat 114 reduces the energy loss coefficient, thereby improving the induction coefficient and making the mixing of the fuel gas and the air more uniform. Experiments show that when H1 is 6D1, the energy loss coefficient of the burner injection is about 2.2; when H1 is 8D1, the energy loss coefficient of the burner injection is about 1.8; when the H1 is more than or equal to 8.5D1 and less than or equal to 9.5D1, the energy loss coefficient of the burner injection is about 1.5. The reduction of the energy loss coefficient is beneficial to the improvement of the injection coefficient, when the injection coefficient is improved, the volume of an actual combustion product is increased, so that the combustion temperature is reduced rapidly, and further, the thermal oxidation reaction can be reduced, so that the emission of nitrogen oxides is reduced (the thermal oxidation reaction refers to the oxidation reaction of nitrogen and oxygen in the air at a high temperature to generate the nitrogen oxides, and experiments prove that the oxidation reaction rate is increased according to an exponential law along with the increase of the reaction temperature).

Preferably, the injection section 110A comprises a premixing section 110A1 and a diffusion section 110A2, the injection pipe 110 has the same cross-sectional shape in the premixing section 110A1, the length of the premixing section 110A1 is H11, wherein 2D1 is not less than H11 is not less than 3D 1; the diffuser section 110A2 gradually deviates from the central axis of the injection pipe 110 along the gas flow direction, the length of the diffuser section 110A2 is H12, wherein H12 is more than or equal to 3.5D1 and less than or equal to 4.5D 1.

Further, the length H2 of the air outlet section 110B is less than or equal to 30% H1, so as to reduce the size of the fire divider 100.

Preferably, D1 is 11mm or more and 14mm or less, and the cross-sectional area of the gas passage formed by each distributor 100 at the throat 114 is 33mm or less²～42mm²Therefore, increasing the number of ejector tubes facilitates reducing the maximum width of the throat 114,to reduce the size of the distributor 100. It should be noted that, in this embodiment, the number of the ejection pipes 110 may be 3, or may be more than 3, and the number of the ejection pipes 110 is increased to improve the ejection coefficient, so as to increase the amount of the ejection 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 is equal to D3, and the center of the inlet end 113 is concave toward the outlet end 115 to form an arc-shaped cross section 113A, as shown in fig. 3, the inlet end 113 with a large round angle design can make the gas flow smoother and increase the amount of air injected by the gas, preferably, D2 is greater than or equal to 18 mm.

As shown in fig. 3 and 4, the ejector pipe 110 further includes a flow divider 112 including a first recess 112A formed by the first casing 100A being recessed into the cavity of the ejector pipe 110 and a second recess 112B formed by the second casing 100B being recessed into the cavity of the ejector pipe 110. The flow divider 112 is used for dividing gas, even if a part of gas is influenced by the resistance of the flow divider 112, the gas is divided to two sides of the injection pipe 110, is sprayed out from the fire holes 121 corresponding to the two sides of the injection pipe 110, and then is combusted to form flame; and the other part of the gas is ejected from the fire hole 121 corresponding to the center of the ejector pipe 110 vertically upward from the gas passage between the first concave portion 112A and the second concave portion 112B, and then is combusted to form a flame.

The angle α of the apex 112C of the flow splitter 112 is preferably 45 ° to 85 °, i.e., the angle of the apex 112C for splitting the gas to both sides thereof is preferably 45 ° to 85 °, to reduce the resistance to gas flow.

Fig. 5 and 6 respectively show a front view and an exploded view of the burner 10, that is, a view when a plurality of igniters 100 are combined together, in this embodiment, the burner 10 further includes a gas distributor 300 disposed below each injector pipe 110, and a gas passage is defined in the gas distributor 300 and is communicated with the injector pipe 110 through a plurality of nozzles 310. When the burner 10 works, the gas valve connected with the valve connector 320 is opened, the gas enters the ejector pipe 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 is equal to 2D0, so that more gas is ejected to enter the ejector pipe 110, the ejection coefficient is improved, and the generation of nitrogen oxides is reduced.

Preferably, in this embodiment, the water inlet pipe through hole 131 and the water outlet pipe through hole 132 are respectively located between two adjacent injection pipes 110, the tops of the water inlet pipe through hole 131 and the water outlet pipe through hole 132 are preferably arranged on the same horizontal plane, and the top E1 of the water inlet pipe through hole 131 should be higher than the bottom 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 this embodiment, the burner 10 is a vertical structure, and after the gas is ejected from the nozzle 310, the gas flow direction is also vertical, and the gas and the air are ignited in the fire hole 121 after being mixed in the ejector pipe 110, and the inlet end 113 with a large round angle can eject more gas amount, so as to reduce the diameter of the throat 114, and increase the length of the ejector section 110A can make the gas mixing more uniform on the premise of reducing the size of the distributor 100. And the design of at least 3 ejector pipes not only can increase the amount of the ejection gas, but also can increase the number of the corresponding nozzles 310, further improve the ejection coefficient and reduce the generation of nitrogen oxides. Experiments have shown that the emission of nitrogen oxides can be reduced from 80ppm (particles per cubic centimeter) to 20ppm by using the flow channel design of the present embodiment.

Further, the fire distributor 100 further includes spacing positioning mechanisms 150 disposed outside the ejector tube 110, and each spacing positioning mechanism 150 includes a first protrusion 151 and a second protrusion 152 disposed symmetrically, where the first protrusion 151 is formed by the first casing 100A protruding to the outside of the ejector tube 110, and the second protrusion 152 is formed by the second casing 100B protruding to the outside of the ejector tube 110.

As shown in fig. 4, the distance between the first protrusion 151 and the second protrusion 152 is D5, and the outer diameter of the inlet end 113 of the eductor tube 110 is D4, wherein D4 is equal to D5, so that the sidewalls of the inlet ends 113 of two

adjacent distributors

103 and 104 can be abutted, and the distance positioning mechanism 150 between two

adjacent distributors

103 and 104 can be abutted, that is, the first protrusion 151 of the distributor 103 and the second protrusion 152 of the distributor 104.

It should be noted that the number of the spacing positioning mechanisms 150 is not limited in this embodiment, for example, one spacing positioning mechanism 150 may be disposed outside one of the injection pipes 110, or one spacing positioning mechanism 150 may be disposed outside each of the injection pipes 110. So long as the sidewalls of the inlet ends of two adjacent distributors 100 can be abutted and the spacing detents 150 of two adjacent distributors can be abutted.

In this embodiment, the spacing positioning mechanism 150 can fix the plurality of fire distributors 100 more firmly, and reduce the shaking or vibration, thereby reducing the noise generated during the operation of the burner 10.

Further, as shown in fig. 5 and 6, the plurality of igniters 100 includes a first igniter 101 and a second igniter 102 arranged at the end of the burner 10, and the burner 10 further includes a first pressing plate 171, a second pressing plate 172, a connecting member 180, a first fastening member 191, and a second fastening member 192. Wherein the first pressing plate 171 is located outside the first flame divider 101, and the second pressing plate 172 is located outside the second flame divider 102; the connecting member 180 sequentially passes through the first pressing plate 171, each of the distributors 100, and the second pressing plate 172; and, the connection member 180 is fastened to the first pressure plate 171 by the first fastening member 191, and the connection member 180 is fastened to the second pressure plate 172 by the second fastening member 192, so that the first pressure plate 171 and the second pressure plate 172 press each distributor 100 from both ends of the burner 10. Preferably, in this embodiment, the connection member 180 may be a double-headed screw, and the first and

second fastening members

191 and 192 may be bolts.

As another aspect of the embodiments of the present invention, the present embodiment further provides a flue type gas water heater including the burner according to the above embodiments. Other configurations of the gas water heater of the present embodiment can be adopted by various technical solutions known to those skilled in the art now and in the future, and will not be described in detail herein. The flue type gas water heater of the embodiment adopts the combustor 10, so that sufficient gas can still be injected under the condition of no fan, the injection coefficient is further improved, and the generation of nitrogen oxides is reduced.

As another aspect of the embodiment of the present invention, the present embodiment also provides a wall-hanging stove including the burner according to the above embodiment. Other configurations of the wall-hanging stove of the present embodiment can be adopted by various technical solutions known to those skilled in the art now and in the future, and will not be described in detail herein.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various changes or substitutions within the technical scope of the present invention, and these should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The combustor is characterized by comprising a plurality of distributors and cold water pipes penetrating through the distributors, wherein the distributors are distributed side by side along the width direction of the distributors, each distributor comprises at least three injection pipes, and each cold water pipe comprises a water inlet pipe and a water outlet pipe so as to discharge water on the same side of the combustor;

the distributor comprises a water inlet pipe through hole for the water inlet pipe to pass through and a water outlet pipe through hole for the water outlet pipe to pass through, and the water inlet pipe through hole and the water outlet pipe through hole are respectively arranged between two adjacent injection pipes.

2. The burner of claim 1, wherein the distributor comprises first and second symmetrically disposed housings, the injector tube gas passage being bounded by the first and second housings, the distributor further comprising a top plate connected above the first and second housings.

3. The burner of claim 1, wherein the top of the inlet tube through hole and the outlet tube through hole are disposed at the same level.

4. The burner of claim 1, wherein the injection pipe is provided with an injection section and an air outlet section in sequence according to the gas flow direction, and the air outlet section is provided with a flow divider which is provided with a vertex angle part for dividing the gas to two sides.

5. The burner of claim 4, wherein the top of the inlet tube through hole is higher than the bottom of the flow splitter.

6. The burner of claim 2, further comprising a spacing mechanism disposed on the outer shell of the fire divider, wherein the spacing mechanism comprises at least a first protrusion or a second protrusion disposed on the first shell or the second shell of two adjacent fire dividers.

7. The burner of claim 1, further comprising a first platen and a second platen disposed at opposite ends of the plurality of distributors; the first pressing plate and the second pressing plate are respectively positioned on the outer sides of two end parts of the plurality of fire distributors.

8. The burner of claim 7, further comprising a connector disposed through the first platen, the plurality of igniters, and the second platen.

9. The burner of claim 8, further comprising at least one fastener for securely connecting the first platen, the second platen, and the connector.

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