Water-cooled full premix burner

Abstract

A water-cooled fully premixed burner includes an open-top gas distribution chamber, a water-cooling pipe, a burner element, a gas guide pipe, and an air-gas premixing device. The gas distribution chamber has perforations on its wall panel. The burner element is corrugated, with the crests forming the combustion chamber. The top and side walls of the combustion chamber have top combustion holes and side combustion holes, respectively. The burner element is embedded within the gas distribution chamber, with the troughs opposite the perforations. The water-cooling pipe passes through the perforations and engages with the troughs for heat exchange. The gas guide pipe connects to the air-gas premixing device and the gas distribution chamber. The burner element's corrugated design, with the water-cooling pipe located within the troughs, results in a low temperature rise in the combustion chamber formed by the corrugations, leading to complete combustion and low nitrogen content. Furthermore, the heat load decreases minimally during prolonged combustion, resulting in energy savings.

Description

Technical Field

[0001] This invention relates to a gas-fired hot water device, and more particularly to a water-cooled fully premixed burner. Background Technology

[0002] The existing technology, Chinese patent 201811556912.1, describes a water-cooled wall burner with a low-NOx, low-consumption, and low-noise fully premixed system. This burner includes a mixing zone, a combustion zone, a gas distribution plate, and a water-cooled wall distribution pipe. One end of the gas distribution plate is connected to the mixing zone, and the other end is connected to the combustion zone. The water-cooled wall distribution pipe is located within the combustion zone, and an ignition port is located on one side of the water-cooled wall distribution pipe. This invention, by placing the gas distribution plate between the mixing zone and the combustion zone, ensures uniform and stable combustion of the combustible mixture on the surface of the water-cooled wall distribution pipe. The water-cooled wall distribution pipe within the combustion zone ensures low-temperature combustion of the combustible mixture on its surface, resulting in more complete combustion and achieving low-NOx, low-consumption, and low-noise effects. However, the invention suffers from uneven gas distribution, unstable flame, and a tendency for gas backflow, leading to incomplete combustion. Summary of the Invention

[0003] The purpose of this invention is to provide a water-cooled fully premixed burner that features uniform gas distribution and complete combustion.

[0004] This invention is implemented as follows: a water-cooled fully premixed burner, characterized in that it includes an upper-opening gas distribution chamber, a water-cooling pipe, a combustion element, a gas guide pipe, and an air-fuel premixing device.

[0005] The gas distribution chamber has pipe holes on its wall panel;

[0006] The combustion element is wavy, with the crest of the wave being the combustion chamber. The top and side walls of the combustion chamber are respectively provided with top combustion holes and side combustion holes.

[0007] The combustion element is embedded in the gas distribution chamber, with the trough facing the pipe hole. The water-cooling pipe passes through the pipe hole and is fitted with the trough for heat exchange. The gas guide pipe is connected to the air-gas premixing device and the gas distribution chamber.

[0008] The water-cooled fully premixed burner is characterized in that: the bottom plate at the trough of the burner is a flat plate, and the water-cooling pipe is tangent to the combustion chamber and the bottom plate at the trough.

[0009] Or the bottom plate at the trough of the combustion component is arc-shaped.

[0010] The water-cooled fully premixed burner is characterized in that: the bottom plate at the trough of the burner is a flat plate, and the water-cooling pipe is tangent to the combustion chamber and the bottom plate at the trough.

[0011] The water-cooled fully premixed burner is characterized in that: the gas guide pipe includes a rectangular cylindrical compression section and an inverted square pyramidal frustum-shaped diffuser section, and the rectangular cylindrical compression section and the inverted square pyramidal frustum-shaped diffuser section are respectively connected to the air-fuel premixing device and the gas distribution chamber.

[0012] The water-cooled fully premixed burner is characterized in that it also includes a flow equalization plate, which has a row of several columns of gas orifice groups, which are opposite to the combustion chamber, and the flow equalization plate supports the combustion components.

[0013] The water-cooled fully premixed burner is characterized by the following feature: it also includes a reinforcing plate, which has a row of several columns of through holes.

[0014] The reinforcing plate is located between the flow equalization plate and the combustion element, and the gas vent group, through hole and combustion chamber correspond to each other.

[0015] The water-cooled fully premixed burner is characterized in that: the air-fuel premixing device includes a main body, a frame-shaped gas pipeline with one open end and an air inlet on the main body, two rows of several columns of ejector chambers and an air head.

[0016] The ejector chamber includes a premixed ejector tube, an annular gas chamber, and a head chamber, with the annular gas chamber connected to the gas pipeline;

[0017] The air head includes a circular base, a tube, and radial ribs surrounding the tube. The circular base has a horn-shaped air cavity that communicates with the tube.

[0018] The circular base is sealed to the head cavity, the tube is inserted into the premixed ejector tube, the radial ribs are supported and matched with the premixed ejector tube, and the gap between the tube and the premixed ejector tube forms an annular gas ejector hole.

[0019] This invention discloses a water-cooled fully premixed burner. The burner adopts a peak-valley design, with the water-cooling pipe located in the valley. The combustion chamber formed by the peaks and the gas temperature rise within it are low, resulting in complete combustion and low nitrogen content. Moreover, the heat load decreases slightly during long-term combustion, thus saving energy. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the present invention.

[0021] Figure 2 yes Figure 1 A-A view.

[0022] Figure 3 yes Figure 1 B-B view.

[0023] Figure 4 This is a perspective view of the present invention.

[0024] Figure 5 This is one of the exploded perspective views of the present invention.

[0025] Figure 6 This is the second exploded perspective view of the present invention.

[0026] Figure 7 This is a perspective view of the air head of the present invention.

[0027] Figure 8 This is a three-dimensional sectional view of the air head of the present invention. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] like Figure 1 As shown, a water-cooled fully premixed burner includes an open-top gas distribution chamber 1, a water-cooling pipe 2, a combustion element 3, a gas guide pipe 4, and an air-fuel premixing device 5.

[0031] The gas distribution chamber 1 has a pipe hole 11 on its wall panel, which is located on the long wall panel along the length direction; the water cooling pipe 2 includes several straight pipes 21 and several U-shaped bends 22, which connect the straight pipes 21 together.

[0032] The combustion element 3 is wavy, with the crest of the wave being the combustion chamber 31. The top and side walls of the combustion chamber 31 are respectively provided with a top combustion hole 311 and a side combustion hole 312.

[0033] The combustion element 3 is embedded in the gas distribution chamber 1, with the trough 32 opposite to the pipe hole 11. The straight pipe of the water-cooled pipe 2 passes through the pipe hole and extends out of the gas distribution chamber 1. The U-shaped bend 22 connects the straight pipes 21 together. The straight pipes 21 are fitted with the trough of the combustion element 3 for heat exchange. The side combustion hole 312 is located on the side wall of the combustion chamber 31 above the straight pipe 21. The gas guide pipe 4 is connected to the air-gas premixing device 5 and the gas distribution chamber 1.

[0034] Tap water enters through one end of the water-cooled pipe 2 and flows out through the other end. The straight pipe 21 exchanges heat with the combustion chamber 31 at the trough, absorbing the heat of the combustion chamber and reducing the temperature rise of the combustion chamber 31. This results in a smaller drop in heat load during combustion, thus improving energy efficiency.

[0035] As a further improvement of the present invention: the top of the combustion chamber 31 is arc-shaped, and the side wall plate is tangent to the top.

[0036] The bottom plate at the trough of the combustion component 3 is a flat plate, and the water cooling pipe 2 is tangent to the combustion chamber 31 and the bottom plate at the trough.

[0037] Alternatively, the bottom plate at the trough of the combustion element 3 is arc-shaped, and the lower half of the straight pipe 21 is in contact with the trough.

[0038] The air guide pipe 4 includes a rectangular cylindrical compression section 41 and an inverted square pyramidal diffuser section 42, which are respectively connected to the air-fuel premixing device and the fuel distribution chamber.

[0039] As a further improvement of the present invention, it also includes a flow equalization plate 6, which is provided with a row of several columns of gas hole groups 61, the gas hole groups 61 being opposite to the combustion chamber 31, and the flow equalization plate 6 supporting the combustion element 3; the flow equalization plate 6 prevents gas backflow and maintains flame stability.

[0040] As a further improvement of the present invention, it also includes a reinforcing plate 7, which has a row of several columns of through holes 71;

[0041] A reinforcing plate 7 is positioned between the flow equalization plate 6 and the combustion element 3, with the gas orifice group 61, the through hole 71, and the opening end of the combustion chamber 31 corresponding to each other. This design effectively prevents deformation of the flow equalization plate and the combustion element 3.

[0042] The air-fuel premixing device 5 includes a main body, a frame-shaped gas pipeline 51 with one open end and an air inlet 52, two rows of several ejector chambers 53 and an air head 54.

[0043] The ejector cavity 53 includes a premixed ejector tube 531, an annular gas cavity 532 and a head cavity 533, wherein the annular gas cavity 532 is connected to the gas pipeline 51;

[0044] The air head 54 includes a circular base 541, a tube 542 and a radial rib 543 surrounding the tube. The circular base 541 is provided with a horn-shaped air cavity and communicates with the tube.

[0045] The circular base 541 is sealed with the head cavity 533, the tube 542 is inserted into the premixed ejector tube 531, the radial rib 543 is supported and cooperated with the premixed ejector tube 531, and the gap between the tube 542 and the premixed ejector tube 531 forms an annular gas ejector hole.

[0046] Gas enters the frame-shaped gas pipeline 51 through the air inlet 52, then enters the annular gas chamber 532, and then enters the premixed ejector tube 531 through the gap between the pipe section 542 and the premixed ejector tube 531. At the same time, the air enters the premixed ejector tube 531 through the trumpet-shaped air inlet chamber of the circular base 541 and the pipe section 542. Gas and air are premixed in the premixed ejector tube 531, then fully mixed in the gas guide pipe 4, and finally enter the gas distribution chamber 1.

[0047] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A water-cooled fully premixed burner, characterized in that: Includes an open-top gas distribution chamber, water-cooled pipes, combustion components, gas guide pipes, and an air-fuel premixing device. The gas distribution chamber has pipe holes on its wall panel; The combustion element is wavy, with the crest of the wave being the combustion chamber. The top and side walls of the combustion chamber are respectively provided with top combustion holes and side combustion holes. The combustion element is embedded in the gas distribution chamber, with the trough facing the pipe hole. The water-cooling pipe passes through the pipe hole and is fitted with the trough for heat exchange. The gas guide pipe is connected to the air-gas premixing device and the gas distribution chamber. It also includes a flow equalization plate, which has a row of several columns of gas hole groups, the gas hole groups being opposite to the combustion chamber, and the flow equalization plate supporting the combustion component; The flow equalization plate prevents gas backflow and maintains flame stability; It also includes a reinforcing plate, which has a row of several columns of through holes; The reinforcing plate is located between the flow equalization plate and the combustion element, and the gas vent group, through hole and combustion chamber correspond to each other.

2. The water-cooled fully premixed burner according to claim 1, characterized in that: The top of the combustion chamber is arc-shaped, and the side wall plate is tangent to the top.

3. A water-cooled fully premixed burner according to claim 2, characterized in that: The bottom plate at the trough of the combustion chamber is a flat plate, and the water-cooling pipe is tangent to the combustion chamber and the bottom plate at the trough. The base plate at the trough of the combustion component is arc-shaped.

4. A water-cooled fully premixed burner according to claim 1, characterized in that: The air guide pipe includes a rectangular cylindrical compression section and an inverted square pyramidal truncated diffuser section. The rectangular cylindrical compression section and the inverted square pyramidal truncated diffuser section are respectively connected to the air-fuel premixing device and the fuel distribution chamber.

5. A water-cooled fully premixed burner according to claim 1, 2, 3 or 4, characterized in that: The air-fuel premixing device includes a main body, a frame-shaped gas pipeline with one open end and an air inlet on the main body, two rows of several ejector chambers and an air head. The ejector chamber includes a premixed ejector tube, an annular gas chamber, and a head chamber, with the annular gas chamber connected to the gas pipeline; The air head includes a circular base, a tube, and radial ribs surrounding the tube. The circular base has a horn-shaped air cavity that communicates with the tube. The circular base is sealed to the head cavity, the tube is inserted into the premixed ejector tube, the radial ribs are supported and matched with the premixed ejector tube, and the gap between the tube and the premixed ejector tube forms an annular gas ejector hole.

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