CN108426244A - A kind of premixed burner - Google Patents

Abstract

The invention discloses a kind of premixed burners, including furnace shell, furnace shell is equipped with air inlet, the air duct cup arranged vertically is equipped on the inside of the furnace shell, the inside of air duct cup is combustion chamber, arranged for interval and air bin is formed between its lateral wall and furnace shell madial wall, air duct cup sidewall, which is equipped with, to extend outwardly and by the guiding air duct of air bin and combustion chamber, it is oriented to air duct side and is equipped with the combustion gas storehouse being isolated with air bin, it is oriented to air duct side wall and is equipped with the through-hole being connected with the combustion gas storehouse, the top of air duct cup is equipped with open ports, furnace shell outer wall is equipped with the Gas Pipe being connected to combustion gas storehouse.Premixed burner provided by the invention can allow combustion gas and air just to complete mixing before entering combustion chamber, and mixing is abundant, and to make the burning of mixed gas in the combustion chamber more abundant, energy transformation ratio higher has achieved the purpose that energy saving, noise reduction, low cost.

Description

A premixed burner

technical field

The invention relates to the field of stoves, in particular to a premixed burner in which gas and air have been mixed before entering the burner.

Background technique

In the current commercial stove, the air enters the burner head through the pipe, and then sprays out from the side wall of the combustion chamber through distribution, mixes and burns with the gas introduced into the burner chamber of the burner head through the gas pipe. This mixing method is a traditional external mixing method. However, when burning, the gas starts to burn when it enters the combustion chamber. The mixing time with the air is too short, the degree of mixing is low, the combustion flame is long and overflows the furnace, and the energy conversion efficiency is low. In order to achieve the required combustion effect, It needs to input more gas into the burner, and the use cost is higher.

In addition, there is a structure in which air and gas are mixed by an external pipe and the mixed gas is introduced into the burner head. When the air-fuel mixed burner adopts an iron plate structure, due to the upper and lower adjacent mixed gas outlets on the side wall of the combustion chamber The horizontal distance from the center of the combustion chamber is the same, and the temperature of the side wall of the combustion chamber between the two is likely to be too high. When the furnace temperature reaches the ignition point, the iron plate structure is prone to internal combustion and burns out.

However, the disc-type mixed air and gas burner head has unreasonable air distribution, and it is prone to the phenomenon of high flame in the combustion chamber. If it is used for a long time or the temperature is too high when the boiler burns, it will cause internal combustion and burn out the burner head. .

Contents of the invention

The purpose of the present invention is to provide a premixed burner, which can complete the mixing of gas and air before entering the combustion chamber, and the mixing is sufficient, so that the combustion of the mixed gas in the combustion chamber is more complete, and the energy conversion rate is higher. The purpose of energy saving and noise reduction has been achieved.

In order to achieve the above object, the present invention provides a premixed burner, which includes a furnace shell, the furnace shell is provided with an air inlet, and the inside of the furnace shell is provided with a vertically arranged air duct cup. The outer wall of the chamber is spaced apart from the inner wall of the furnace shell to form an air chamber. The side wall of the air duct cup is provided with a guide air duct extending outward and connecting the air warehouse with the combustion chamber. One side of the guide air duct is provided with The gas chamber isolated from the air chamber, the side wall of the guiding air channel is provided with a through hole communicating with the gas chamber, the top of the air duct cup is provided with an open opening, and the outer wall of the furnace shell is provided with a gas chamber connected to the gas chamber. Tube.

As a further improvement of the present invention, the number of the guide air ducts is multiple and evenly distributed around the outer wall of the air duct cup.

As a further improvement of the present invention, the number of the guide air ducts is multiple and spaced up and down, and the gas chamber communicates with the inside of each guide air duct through through holes.

As a further improvement of the present invention, among the two adjacent upper and lower guide air ducts, the horizontal distance from the output end of the upper guide air duct to the center of the combustion chamber is shorter than that of the lower guide air duct from the output end to the center of the combustion chamber. The horizontal distance is 10-15mm long, and the side wall of the air duct cup between the upper and lower two adjacent guide air ducts is conical.

As a further improvement of the present invention, the side wall of the input end of the air guide duct is a tapered structure whose cross-sectional area gradually decreases along the air flow direction.

As a further improvement of the present invention, a vertically arranged air guide basin is arranged outside the air chamber, and the air guide basin surrounds the outside of the air duct cup and is spaced apart from it. The lower part is connected, and the upper edge of the air guide basin is spaced apart from the top of the furnace shell.

As a further improvement of the present invention, the air duct cup includes at least two cylinders connected up and down in sequence, and the opposite ends of the two adjacent cylinders are provided with flanging flanges, and the two adjacent flanging flanges The opposite end surfaces of the flange are provided with strip-shaped grooves extending in parallel to the flange, and the upper and lower grooves are engaged with each other to form the guide air duct.

As a further improvement of the present invention, the ignition tube is included, the bottom of the air duct cup is provided with an ignition distribution cavity, the input end of the ignition tube is located outside the furnace shell, and the gas outlet end is located on the side wall of the ignition distribution cavity.

As a further improvement of the present invention, a guide cup is included. The guide cup includes a vertically arranged windshield that penetrates up and down. There are air outlets corresponding to the output ends of the air guide duct one by one, and the size of the air outlet is adapted to the cross-sectional size of the air guide duct.

As a further improvement of the present invention, an ignition device is installed at the bottom of the air duct cup.

Beneficial effect

Compared with the prior art, the advantages of the premixed burner of the present invention are:

1. After the air enters the air chamber, it enters the guide air channel and flows to the combustion chamber. At this time, the moving air will generate negative pressure in the guide air channel, so that the gas in the gas chamber will be sucked into the guide air through the through hole on the guide air channel. In addition, because the guide air duct has a certain length, the mixing time of air and gas is increased, and the mixing is more complete, so that the mixed gas can be burned more fully in the combustion chamber and the energy conversion rate is higher. , to achieve the purpose of energy saving and noise reduction; since the air and gas are mixed in the guide air duct, and the two are basically fully mixed when they reach the combustion chamber, it is avoided that the fully mixed gas mixture is in the air due to the high temperature of the air duct cup. Combustion starts in the guide air duct, prolonging the life of the burner;

2. Since the horizontal distance from the output end of the upper guide air duct to the center of the combustion chamber is 10-15mm longer than the horizontal distance from the output end of the lower guide air duct to the center of the combustion chamber, the upper and lower guide air ducts When the output gas is burning, it can be staggered longitudinally, and the conical side wall of the air duct cup between the two can effectively avoid the outer flame with the highest flame temperature, which not only reduces the overall temperature of the air duct cup, but also avoids It prevents the mixed gas from burning prematurely due to the high temperature of the guide air duct before entering the combustion chamber, which improves the combustion efficiency and greatly prolongs the service life of the burner;

3. The air guide basin allows the air entering the air chamber to flow upwards to the top of the burner first. Since the top of the burner is at a higher temperature during operation, the air moving to the vicinity can be heated to form hot air. The heated air Bypassing the upper edge of the air guiding basin and then moving down and entering each guiding air channel, it can promote the mixing speed and uniformity of gas and air, which is conducive to further improving combustion efficiency;

4. The guide air duct is formed by interlocking the strip-shaped grooves on the flanging flanges of the two cylinders. The length of the guide air duct formed is sufficient to guide the air passing through it into the inner side of the air duct cup. Prevent the airflow in the air duct cup from being unevenly distributed due to turbulent flow, the structure is simple, the amount of materials used is less, and the cost is reduced by 30%-40% compared with existing products;

5. Due to the split structure between two adjacent flanging flanges, if it cannot be completely sealed and a gap is formed, part of the air will enter the inside of the air duct cup through the gap, resulting in turbulent flow in the air duct cup; and The cost of completely sealing the gap between the flanges is relatively high; while the windshield passing through the guide cup can block the air leaking from between the flanges and avoid turbulent flow, and the cost is very low.

The present invention will become clearer through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the sectional view of premixed burner in embodiment 1;

Fig. 2 is a sectional view of the air duct cup;

Figure 3 is an enlarged schematic view of the gas bin and the guide air duct;

Fig. 4 is a schematic diagram of forming a guide air duct by interlocking grooves on two adjacent cylinders;

Fig. 5 is the structural representation of guide cup 3;

Fig. 6 is a cross-sectional view of the premix burner adopting the air guiding basin in the first embodiment.

Detailed ways

Embodiments of the present invention will now be described with reference to the drawings.

Example 1

Specific embodiments of the present invention, as shown in Figures 1 to 5, a premixed burner includes a furnace shell 2, the furnace shell 2 is provided with an air inlet 21, and the inner side of the furnace shell 2 is provided with a vertically arranged Air duct cup 1, the inner side of air duct cup 1 is a combustion chamber, the outer side wall and the inner side wall of furnace shell 2 are spaced apart to form an air chamber 9, and the side wall of air duct cup 1 is provided with an air chamber extending outward and 9. A guide air duct 11 communicating with the combustion chamber. A gas chamber 8 isolated from the air chamber 9 is provided on one side of the guide air duct 11. A through hole communicating with the gas chamber 8 is provided on the side wall of the guide air duct 11. 18. The top of the air duct cup 1 is provided with an open opening 13, and the outer wall of the furnace shell 2 is provided with a gas pipe 6 communicating with the gas chamber 8.

In this embodiment, the air inlet 21 is located at the bottom of the furnace shell 2 .

The number of the guide air ducts 11 is multiple and uniformly distributed around the outer wall of the air duct cup 1 .

The number of the guide air ducts 11 is multiple and spaced up and down, and the gas chamber 8 communicates with the inside of each guide air duct 11 through the through holes 18 .

In this embodiment, among the two adjacent air guide ducts 11 up and down, the horizontal distance from the output end of the upper air guide duct 11 to the center of the combustion chamber is shorter than that of the lower air guide duct 11 from the output end to the combustion chamber. The horizontal distance of the center is 10-15mm long, and the side wall of the air duct cup 1 between the upper and lower two adjacent guide air ducts 11 is conical. The horizontal distance of 10-15 mm can make the output end of the air guide duct 11 above and the side wall of the conical surface of the air duct cup 1 avoid the flame flame at the output end of the air guide duct 11 below. The upper and lower two adjacent guide air ducts 11 have the same length.

The side wall of the input end of the guide air duct 11 is a tapered structure whose cross-sectional area gradually decreases along the air flow direction.

The air duct cup 1 includes at least two cylinders 14 connected up and down in sequence, and the opposite ends of the two adjacent cylinders 14 are provided with flanges 15, and the two adjacent flanges 15 are opposite to each other. The end faces of each are provided with strip-shaped grooves 16 extending in a direction parallel to it, and the upper and lower two grooves 16 are interlocked to form the guide air duct 11 .

In this embodiment, the furnace shell 2 and the cylinder body 14 are metal sheet structures, and the metal sheet body is made of steel or stainless steel, and adjacent cylinder bodies 14 are welded to each other.

The premixed burner also includes a kindling pipe 5, the bottom of the air duct cup 1 is provided with a kindling distribution chamber 17, the input end of the kindling pipe 5 is located outside the furnace shell 2, and its gas outlet is located on the side wall of the kindling distribution chamber 17 . The kindling tube 5 is not provided with a through hole 18, and the kindling gas directly enters the kindling distribution chamber 17 from the outside of the furnace shell 2.

The fire distribution chamber 17 is also provided with a plurality of air guide pipes 19 , the input ends of the air guide pipes 19 are located in the air chamber 9 , and the output ends of the air guide pipes 19 are located on the side wall of the fire seed distribution chamber 17 . The air duct 19 is formed by interlocking the upper and lower grooves 16 . The air in the air chamber 9 enters the kindling distribution cavity 17 from the air guide pipe 19 and mixes with the kindling gas and burns, and also plays the role of air cooling simultaneously.

In this embodiment, the guide air duct 11 is divided into four layers arranged sequentially from bottom to top. The guide air duct 11 on the first layer at the bottom is the spark tube 5, and the diameter of the spark tube 5 is smaller than that of the guide air duct 11 on the upper three layers. path.

There are three partitions 7 on the outside of the side wall of the air duct cup 1, and the upper and lower edges of each partition 7 are sealed and welded to the upper and lower flanges 15 that guide the air duct 11 respectively. A closed space is formed between 7 and the flanging flanges 15 of the upper and lower two guiding air ducts 11, and each closed space is connected to form a gas chamber 8.

The premixed furnace head includes a guide cup 3, and the guide cup 3 includes a vertically arranged windshield 31 that penetrates up and down. 31 is provided with an air outlet 32 corresponding to the output end of the guide air duct 11 one by one, and the size of the air outlet 32 is adapted to the cross-sectional size of the guide air duct 11 .

The guide cup 3 includes a mounting flange 33 on the top of the windshield 31, the mounting flange 33 is located outside the air duct cup 1, and the outer edge of the mounting flange 33 passes through the upper edge of the furnace shell 2. Solder connection. The outer wall of the windshield tube 31 of the guide cup 3 and the top edge of the air duct cup 1 are welded to each other.

An ignition device 4 is installed at the bottom of the air duct cup 1 . The bottom of the air duct cup 1 is provided with a stepped hole 12 for installing the ignition device 4 .

Example 2

As shown in FIG. 6 , the difference from Embodiment 1 is that the air chamber 9 is provided with a vertically arranged air guide basin 10 , which surrounds the outside of the air duct cup 1 and is spaced apart from it. The lower edge of the air guiding basin 10 is connected to the lower part of the gas chamber 8 , and the upper edge of the air guiding basin 10 is spaced apart from the top of the furnace shell 2 .

In the above-mentioned embodiment, the ignition tube 5 may not adopt the structure of the guide air duct 11, but it may adopt an integral metal tube. One end of the ignition tube 5 is connected to the gas tube outside the burner, and the other end extends into the ignition distribution chamber 17. Inside.

The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the above-disclosed embodiments, but should cover various modifications and equivalent combinations made according to the essence of the present invention.

Claims (10)

1. A premixed burner, comprising a furnace shell (2), the furnace shell (2) is provided with an air inlet (21), it is characterized in that, the inside of the furnace shell (2) is provided with a vertically arranged air The duct cup (1), the inside of the duct cup (1) is a combustion chamber, the outer side wall and the inner side wall of the furnace shell (2) are arranged at intervals to form an air chamber (9), the side wall of the duct cup (1) There is a guide air channel (11) that extends outward and communicates the air storehouse (9) with the combustion chamber, and a gas storehouse (8) that is isolated from the air storehouse (9) is provided on one side of the guide air channel (11). The side wall of the air duct (11) is provided with a through hole (18) communicating with the gas chamber (8), the top of the air duct cup (1) is provided with an opening (13), and the outer wall of the furnace shell (2) A gas pipe (6) communicated with the gas bin (8) is provided. 2. A premixed burner head according to claim 1, characterized in that there are multiple guide air ducts (11) distributed uniformly around the outer wall of the air duct cup (1). 3. A premixed burner according to claim 1, characterized in that, the number of the guide air ducts (11) is multiple and distributed at intervals up and down, and the gas chamber (8) and each guide air duct The insides of the channels (11) are all connected through through holes (18). 4. A premixed burner according to claim 3, characterized in that, among the two adjacent upper and lower guide air ducts (11), the upper guide air duct (11) has its output end connected to the The horizontal distance of the center of the combustion chamber is 10-15mm longer than the horizontal distance from the output end of the guide air duct (11) below to the center of the combustion chamber, and the air duct cup between two adjacent guide air ducts (11) up and down ( 1) The side wall is conical. 5 . The premixed burner according to claim 1 , characterized in that, the side wall of the input end of the guide air channel ( 11 ) is a conical structure whose cross-sectional area gradually decreases along the air flow direction. 5 . 6. A premixed burner according to claim 1, characterized in that a vertically arranged air guide basin (10) is arranged inside the air chamber (9), and the air guide basin (10) surrounds On the outside of the air duct cup (1) and arranged at intervals therebetween, the lower edge of the air guide basin (10) is connected to the lower part of the gas chamber (8), and the upper edge of the air guide basin (10) is connected to the furnace shell (2 ) at top intervals. 7. A premixed burner head according to any one of claims 1 to 6, characterized in that the air duct cup (1) comprises at least two cylinders (14) connected up and down in sequence, adjacent to each other The opposite ends of the two cylinders (14) are provided with flanging flanges (15), and the opposite end faces of two adjacent said flanging flanges (15) are provided with strip-shaped recesses extending in parallel with them. Groove (16), the upper and lower two grooves (16) are interlocked to form the guide air duct (11). 8. A kind of premixed burner head according to claim 7, characterized in that it comprises a kindling tube (5), the bottom of the air duct cup (1) is provided with a kindling distribution cavity (17), and the kindling pipe ( 5) The input end is located outside the furnace shell (2), and the gas output end is located on the side wall of the ignition distribution chamber (17). 9. A premixed burner head according to claim 7, characterized in that it comprises a guide cup (3), and the guide cup (3) includes a vertically arranged windshield tube (31) penetrating up and down, the windshield The air duct (31) is arranged inside the air duct cup (1) and the cross-sectional dimensions of the two are compatible, and the air duct (31) is provided with air outlets ( 32), the size of the air outlet (32) is adapted to the cross-sectional size of the guide air duct (11). 10. A premixed burner according to claim 1, characterized in that an ignition device (4) is installed at the bottom of the air duct cup (1).