CN110645573A

CN110645573A - Premixing device and gas water heater

Info

Publication number: CN110645573A
Application number: CN201810682362.1A
Authority: CN
Inventors: 寿利萍; 梁泽锋; 梁国荣; 张小林
Original assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2018-06-27
Filing date: 2018-06-27
Publication date: 2020-01-03

Abstract

The invention discloses a premixing device and a gas water heater, wherein the premixing device comprises: the air inlet structure comprises a shell provided with a premixing cavity, wherein the shell is provided with a first air inlet which is communicated with the premixing cavity; and a first distribution plate disposed in the premix chamber, the first distribution plate being provided with a raised structure around which air flow holes are provided, the first distribution plate being configured to: when the gas enters the premixing cavity from the first gas inlet, the gas is firstly divided by the convex structure, and the divided gas flows out from the gas flow hole. The invention can make the gas outlet more uniform, and the gas flow of the mixed gas is more uniform, thereby improving the combustion effect.

Description

Premixing device and gas water heater

Technical Field

The invention relates to the field of gas water heaters, in particular to a premixing device and a gas water heater.

Background

At present, a combustor part of a gas water heater is installed in a combustor frame, a nozzle is usually installed on a gas distribution rod, air is provided by a fan, an injection structure is designed on a combustor single piece, gas is injected through the nozzle to inject the air, then the air and the gas are mixed in a combustor single piece flow channel, and combustion is carried out at a fire hole outlet. However, such a design has the following problems: the air required by combustion is adjusted through the primary air distribution plate and the secondary air distribution plate, the structure is complex, the flow channel is complex, especially the design requirement of a single burner sheet is high, and the requirement of the manufacturing process is high.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide a premixing device and a gas water heater, so that gas is discharged more uniformly, the gas flow of mixed gas is more uniform, and the combustion effect is improved.

In order to achieve the above object, an aspect of the present invention provides a premixing device including: the air inlet structure comprises a shell provided with a premixing cavity, wherein the shell is provided with a first air inlet which is communicated with the premixing cavity; and a first distribution plate disposed in the premix chamber, the first distribution plate being provided with a raised structure around which air flow holes are provided, the first distribution plate being configured to: when the gas enters the premixing cavity from the first gas inlet, the gas is firstly divided by the convex structure, and the divided gas flows out from the gas flow hole.

Preferably, the premixing device comprises a gas inlet pipe, one end of the gas inlet pipe is used for being connected with a gas source, the other end of the gas inlet pipe is arranged between the first distribution plate and the first gas inlet, and a gas outlet is formed in the part, located in the shell, of the gas inlet pipe.

Preferably, the gas outlet is arranged to: the spraying direction of the fuel gas is tangent to the circumferential direction of the fuel gas inlet pipe.

Preferably, the jetting direction of the gas is opposite to the air intake direction of the first air intake port.

Preferably, the premixing device comprises a second distribution plate, a plurality of through holes are arranged on the second distribution plate, and the second distribution plate is arranged in the premixing cavity, so that the gas firstly passes through the gas flow holes of the first distribution plate and then flows out of the through holes.

Preferably, the premixing device includes a plurality of the second distribution plates, which are disposed at intervals in a flow direction of the gas.

Preferably, the cross section of the convex structure is in a V shape, and the airflow holes are arranged on two sides of the convex structure.

The invention provides a gas water heater in a second aspect, which comprises the premixing device.

Preferably, the gas water heater includes a fan connected to the first air inlet.

Preferably, the gas water heater includes a burner in communication with the premix chamber such that gas passes through the first distributor plate before entering the burner.

Through the technical scheme, the first air inlet is communicated with the premixing cavity so as to provide the mixed gas of air and fuel gas into the premixing cavity, the protruding structure of the first distribution plate is arranged right opposite to the first air inlet, when the mixed gas flows to the premixing cavity from the first air inlet, the mixed gas can firstly contact the protruding structure, and the mixed gas is shunted by the protruding structure and flows to the airflow holes arranged around the protruding structure and finally flows out from the airflow holes. The mixed gas flows out from the airflow holes and then converges through the flow division, so that the purpose of uniform mixing is achieved, and the combustion efficiency can be improved.

Drawings

FIG. 1 is a schematic structural view of a preferred embodiment of the premixing device of the present invention;

FIG. 2 is a perspective view of FIG. 1;

FIG. 3 is a schematic view of a first distributor plate;

fig. 4 is a side view of the gas inlet pipe.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

As shown in fig. 1 to 4, the premixing device of the present invention comprises a housing 10 provided with a premixing chamber and a first distribution plate 20; the shell 10 is provided with a first air inlet 11, and the first air inlet 11 is communicated with the premixing cavity; it should be understood that the premix chamber may be designed in various shapes, and in some embodiments of the present invention, the premix chamber is provided as a rectangular parallelepiped-shaped accommodating space. The first distribution plate 20 is arranged in the premix chamber, the first distribution plate 20 is provided with a protruding structure 21, the protruding structure 21 is provided with air flow holes 22 around, the first distribution plate 20 is arranged as follows: when the air enters the premixing chamber from the first air inlet 11, the air is firstly divided by the convex structure 21, and the divided air flows out from the air flow hole 22.

According to an embodiment of the present invention, the first air inlet 11 may provide a mixture of air and gas into the premix chamber, that is, the mixing action of air and gas occurs at the front end of the first air inlet 11. The convex structures 21 of the first distribution plate 20 are disposed opposite to the first gas inlets 11, when the mixed gas flows from the first gas inlets 11 to the premix chamber, the mixed gas first contacts the convex structures 21, and the mixed gas is divided by the convex structures 21 to flow to the gas flow holes 22 disposed around the convex structures 21 and finally flow out of the gas flow holes 22. The mixed gas flows out from the airflow holes 22 through the flow division and then is converged, so that the purpose of uniform mixing is achieved, and the combustion efficiency can be improved.

According to another embodiment of the present invention, the first air inlet 11 is used for providing air to the premixing chamber, and the mixing action of the air and the gas occurs at the rear end of the first air inlet 11, in some embodiments of the present invention, as shown in fig. 1, the premixing device includes a gas inlet pipe 30, one end of the gas inlet pipe 30 is used for connecting a gas source, the other end is arranged between the first distribution plate 20 and the first air inlet 11, and the part of the gas inlet pipe 30 located in the housing 10 is provided with a gas outlet. In this way, the gas reaches the gas outlet through the gas inlet pipe 30 and is ejected from the gas outlet, and the gas ejected from the gas outlet is mixed with the air flowing from the first gas inlet 11 to the premixing chamber to form a mixed gas, and then the mixed gas flows into the premixing chamber.

The gas ejected from the gas outlet may be arranged to face any direction because the gas can be mixed with the air to form a mixed gas as long as the gas is ejected from the gas outlet, for example, the ejection direction of the gas may be arranged to be perpendicular to the radial direction of the gas inlet pipe 30, and in some embodiments of the present invention, in order to better mix the gas with the air, as shown in fig. 4, it is preferable that the gas outlet is arranged: the gas ejection direction d is tangential to the circumferential direction of the gas inlet pipe 30. It should be understood that the tangential direction mentioned herein does not mean a strict geometric tangency, but means that the ejection direction d of the gas is as close as possible to the wall of the gas inlet pipe 30.

In the case where the gas discharge direction d is tangential to the circumferential direction of the gas inlet pipe 30, the gas discharge direction is preferably set opposite to the gas inlet direction of the first gas inlet port 11 in order to further mix the gas uniformly. That is, in the premixing device shown in fig. 1, when the air flows upward from the first air inlet 11 toward the premixing chamber, the spouting direction d of the gas is set to be spouted downward, i.e., opposite to the flow direction of the air.

The mixed gas is branched by the convex structure 21 to flow to the gas flow holes 22 provided around the convex structure 21, and finally flows out from the gas flow holes 22. The mixed gas is divided, flows out from the airflow holes 22 and is converged, so that the aim of uniform mixing is fulfilled. In order to further uniformly mix the mixed gas flowing out from the gas flow holes 22, as shown in fig. 2, it is preferable that the premixing device includes a second distribution plate 40, the second distribution plate 40 is provided with a plurality of through holes 41, and the second distribution plate 40 is disposed in the premixing chamber such that the gas passes through the gas flow holes 22 of the first distribution plate 20 and then flows out from the through holes 41. The mixed gas is continuously flowed and mixed on the surface of the second distribution plate 40 so as to pass through the through holes 41 of the second distribution plate 40, and the mixed gas, which is further uniformly mixed, finally flows out of the through holes 41. It should be understood that the number, shape and distribution of the through holes 41 can be changed according to different premix chamber structures.

In order to finally achieve a uniformly mixed state of the mixed gas, it is preferable that the premixing device includes a plurality of second distribution plates 40, and the plurality of second distribution plates 40 are arranged at intervals in the flowing direction of the gas. That is, in the premixing device shown in fig. 1, another second distribution plate (not shown in fig. 1) is further disposed above the second distribution plate 40 adjacent to the first distribution plate 20, the number of the second distribution plates 40 varies according to the structure of the premixing chamber, and at least one of the number, shape and distribution of the through holes 41 in each second distribution plate 40 may be set to be different.

The protruding structures 21 on the first distribution plate 20 function to divide the mixed gas, and for this purpose, the contact area between the protruding structures 21 and the mixed gas should be reduced as much as possible to ensure that the mixed gas can be smoothly divided by the protruding structures 21, so that, in some embodiments of the present invention, as shown in fig. 3, the protruding structures 21 have a V-shaped cross section, and the gas flow holes 22 are disposed on both sides of the protruding structures 21. It should be understood that the shape of the gas flow holes 22 is not limited to the elongated shape shown in fig. 3, and the gas flow holes 22 may be provided in any shape as long as the mixed gas can smoothly flow out of the gas flow holes 22.

The invention also provides a gas water heater, which comprises the premixing device. The gas water heater has better combustion effect because the mixed gas of the gas and the air is more uniformly mixed.

The gas water heater comprises a fan, wherein the fan is connected with a first air inlet 11. I.e. a fan is used to supply the flowing air directly to the first air inlet 11.

The gas water heater of the present invention includes a burner that is in communication with the premix chamber such that the gas first passes through the first distributor plate 20 and then enters the burner.

As shown in fig. 1 to 4, in a preferred embodiment of the present invention, the gas water heater includes a burner and a blower, the blower is connected to the first air inlet 11, the burner is communicated with a premixing chamber, and a first distribution plate 20 is disposed in the premixing chamber. Gas heater still includes gas intake pipe 30, and gas intake pipe 30 one end is used for connecting the gas air supply, and the other end setting is between first distribution plate 20 and first air inlet 11, and the part that gas intake pipe 30 is located shell 10 is provided with the gas export, and the gas export sets up to: the gas ejection direction d is tangential to the circumferential direction of the gas inlet pipe 30. When the air provided by the fan flows to the premixing cavity from the first air inlet 11, the air is mixed with the fuel gas to form mixed gas. The first distribution plate 20 is provided with a V-shaped protrusion structure 21, and the protrusion structure 21 is disposed toward the first gas inlet 11 so that the mixed gas is firstly divided by the protrusion structure 21 when flowing to the premix chamber, and the divided mixed gas flows out from the gas flow hole 22. The second distribution plate 40 is disposed above the first distribution plate 20, and the mixed gas flowing out of the gas flow holes 22 flows to the second distribution plate 40, flows and is mixed on the surface of the second distribution plate 40, so that the mixed gas is more uniform, and finally, the mixed gas flows out of the through holes 41 of the second distribution plate 40, flows to the burner, and the mixed gas is mixed uniformly by the air and the gas through a plurality of mixing operations, so that the mixed gas can improve the combustion effect of the burner.

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 devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

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

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

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

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A premixing apparatus, comprising:

the air inlet structure comprises a shell (10) provided with a premixing cavity, wherein the shell (10) is provided with a first air inlet (11), and the first air inlet (11) is communicated with the premixing cavity; and

a first distributor plate (20), the first distributor plate (20) being disposed in the premix chamber, the first distributor plate (20) being provided with a raised structure (21), the raised structure (21) being provided with air flow holes (22) therearound, the first distributor plate (20) being configured to: when the gas enters the premixing cavity from the first gas inlet (11), the gas is firstly divided by the convex structure (21), and the divided gas flows out from the gas flow hole (22).

2. The premixing device according to claim 1, characterized in that the premixing device comprises a gas inlet pipe (30), one end of the gas inlet pipe (30) is used for connecting a gas source, the other end is arranged between the first distribution plate (20) and the first gas inlet (11), and the part of the gas inlet pipe (30) in the housing (10) is provided with a gas outlet.

3. The premixing device according to claim 2, wherein the gas outlet is arranged to: the spraying direction of the fuel gas is tangential to the circumferential direction of the fuel gas inlet pipe (30).

4. A premixing device according to claim 3, characterized in that the ejection direction of the gas is arranged opposite to the intake direction of the first intake port (11).

5. The premixing device according to claim 1, wherein the premixing device comprises a second distribution plate (40), wherein a plurality of through holes (41) are provided in the second distribution plate (40), and wherein the second distribution plate (40) is disposed in the premixing chamber such that the gas flows through the through holes (41) after passing through the gas flow holes (22) of the first distribution plate (20).

6. The premixing device according to claim 5, characterized in that it comprises a plurality of said second distribution plates (40), said second distribution plates (40) being arranged at intervals in the flow direction of the gases.

7. The premixing device according to claim 1, characterized in that the cross-section of the protruding structure (21) is V-shaped, and the air flow holes (22) are arranged on both sides of the protruding structure (21).

8. A gas water heater comprising a premixing device as claimed in any one of claims 1 to 7.

9. Gas water heater according to claim 8, characterized in that it comprises a fan connected to said first air inlet (11).

10. The gas water heater of claim 8, including a burner in communication with the premix chamber such that gas passes through the first distributor plate (20) before entering the burner.