A gas film protection premix burner

Abstract

The present invention discloses an air film protection type premix burner, comprising a shell, an outer ring groove, a mixed gas ring groove, and an inner ring groove arranged from outside to inside and opening to the right are arranged on the shell, a first air inlet, a mixed gas inlet, and a second air inlet are respectively connected to the outer ring groove, the mixed gas ring groove, and the inner ring groove on the shell, and an igniter is also included, the igniter is connected to the shell, and the head of the igniter is arranged on the inner side of the inner ring groove. The mouth of the mixed gas ring groove sprays out the mixed gas, and the mouths of the outer ring groove and the inner ring groove form outer and inner air films respectively; when the speed of the mixed gas is less than the flame propagation speed, there is a risk of flashback, and the outer and inner air films can separate the mouth of the mixed gas ring groove from the combustion field in the kiln to prevent flashback; the outer and inner air films increase the speed of the mixed gas through the induced effect to prevent flashback; when the air flow speed of the mixed gas is greater than the flame propagation speed, there is no risk of flashback, and the outer and inner air films are conducive to improving the combustion efficiency.

Description

Technical Field

[0001] The invention relates to the field of premix burners, in particular to an air film protection type premix burner. Background Art

[0002] Premix burners are used in kilns. They are equipped with a mixed gas inlet, which is used to connect a premixing device, which is used to premix combustible gas and air. Premix burners have the advantages of high combustion efficiency, low air residual gas coefficient, obvious combustion energy-saving effect, and low pollutant emissions.

[0003] However, the premix burner has the defects of easy backfire and burning of the mixed gas nozzle, and there are certain safety hazards. Therefore, the prior art needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide a gas film protection type premix burner which is not prone to backfire.

[0005] The solution of the present invention to solve its technical problem is:

[0006] A gas film protection premix burner comprises a shell, on which an outer ring groove, a mixed gas ring groove and an inner ring groove are arranged from outside to inside, and the outer ring groove, the mixed gas ring groove and the inner ring groove are all opened to the right. The shell is also provided with a first air inlet, a mixed gas inlet and a second air inlet which are connected to the outer ring groove, the mixed gas ring groove and the inner ring groove respectively, and also comprises an igniter, which is connected to the shell, and the head of the igniter is arranged on the inner side of the inner ring groove.

[0007] As a further improvement of the above technical solution, the shell includes an outer shell, an inner shell, a distribution tube, and a core shell which are sequentially arranged from the outside to the inside; the outer ring groove, the mixed gas ring groove, and the inner ring groove are respectively arranged between the outer shell and the inner shell, between the inner shell and the distribution tube, and between the distribution tube and the core shell, and the igniter is connected to the core shell.

[0008] As a further improvement of the above technical solution, the right end of the inner ring groove is inclined outward.

[0009] As a further improvement of the above technical solution, an opening is provided at the left end of the core shell, and the left end of the core shell is connected to the inner side wall of the inner shell.

[0010] As an optional technical solution, a first inclined surface is provided on the inner side wall of the outer shell or on the outer side wall of the inner shell.

[0011] As a further improvement of the above technical solution, the outer shell includes a left shell and a right shell fixed to each other, and the first inclined surface is arranged on the right shell.

[0012] As an optional technical solution, a hollow is provided in the core shell, and the left and right parts of the core shell are respectively provided with an air inlet hole and an air outlet hole, both of which are connected to the hollow. The igniter part is arranged in the hollow, the air inlet hole is connected to the inner ring groove, and the air outlet hole is arranged on the side of the head of the igniter.

[0013] As a further improvement of the above technical solution, the igniter is arranged away from the axis of the core shell.

[0014] As an optional technical solution, a plurality of spacers are provided on the outer side wall of the distribution cylinder at intervals, and the outer ends of the spacers abut against the inner side wall of the inner shell.

[0015] As an optional technical solution, an observation hole is provided on the shell, the observation hole is communicated with the mixed gas annular groove, and a transparent window is sealed and connected to the observation hole.

[0016] The beneficial effects of the present invention are as follows: the mouth of the mixed gas annular groove sprays out the mixed gas, and the mouths of the outer annular groove and the inner annular groove spray out the outer air film and the inner air film respectively; when the air flow velocity of the mixed gas is lower than the flame propagation velocity, there is a risk of flashback, and the outer air film and the inner air film can separate the mouth of the mixed gas annular groove from the combustion field in the kiln to prevent flashback; the outer air film and the inner air film can also increase the speed of the mixed gas through the induced effect, so that the mixed gas speed is greater than the flame propagation speed to prevent flashback; when the air flow velocity of the mixed gas is greater than the flame propagation speed, there is no risk of flashback. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0018] Figure 1 is a cross-sectional view of the present invention;

[0019] Figure 2 It is a right side view of the present invention;

[0020] Figure 3 It is a schematic diagram of the gas film protection premixing burner of the present invention after being matched with the premixing device. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0022] Reference Figure 1 to Figure 3 , are embodiments of the present invention, specifically:

[0023] A gas film protection premix burner comprises a shell, on which an outer ring groove 112, a mixed gas ring groove 22 and an inner ring groove 32 are arranged from outside to inside, and the outer ring groove 112, the mixed gas ring groove 22 and the inner ring groove 32 are all opened to the right. The shell is also provided with a first air inlet 111, a mixed gas inlet 21 and a second air inlet 31 which are connected to the outer ring groove 112, the mixed gas ring groove 22 and the inner ring groove 32 respectively, and also comprises an igniter 5, which is connected to the shell, and the head of the igniter 5 is arranged on the inner side of the inner ring groove 32.

[0024] The principle of the present invention is as follows: the mixed gas inlet 21 is used to connect to an external premixing device, the premixing device is used to premix combustible gas and air, the mixed gas of combustible gas and air enters the mixed gas annular groove 22 from the mixed gas inlet 21 and is ejected from the mouth of the mixed gas annular groove 22 to be burned. The first air inlet 111 and the second air inlet 31 are used to connect to an external air source, and the outer layer annular groove 112 and the inner layer annular groove 32 form an outer layer air film and an inner layer air film on their right sides, respectively.

[0025] When in use, the air source entering the external premixing device and the air source entering the first air inlet 111 and the second air inlet 31 are independent air sources, so as to independently control the gas volume of the outer air film and the inner air film, and at the same time independently control the flow rate of the mixed gas.

[0026] When the air flow velocity of the mixed gas is lower than the flame propagation velocity, the outer air film and the inner air film can separate the mouth of the mixed gas ring groove 22 from the combustion field in the kiln to prevent flashback. At the same time, the outer air film and the inner air film can increase the velocity of the mixed gas through the induced effect, making the mixed gas velocity greater than the flame propagation velocity to prevent flashback.

[0027] When the air flow velocity of the mixed gas is greater than the flame propagation velocity, there is no risk of backfire, and the mixed gas can break through the outer air film and the inner air film.

[0028] Further as a preferred embodiment, the shell includes an outer shell 1, an inner shell 2, a distribution tube 3, and a core shell 4 which are sequentially arranged from the outside to the inside; the outer annular groove 112, the mixed gas annular groove 22, and the inner annular groove 32 are respectively arranged between the outer shell 1 and the inner shell 2, between the inner shell 2 and the distribution tube 3, and between the distribution tube 3 and the core shell 4; the igniter 5 is connected to the core shell 4.

[0029] As a further preferred embodiment, the right end of the inner ring groove 32 is inclined outward. The advantage of this technical solution is that the injection direction of the inner air film is limited to be inclined outward, the outer air film and the inner air film intersect, surround the mixed gas, and give full play to the ejection effect and separate the mouth of the mixed gas ring groove 22 from the combustion field in the kiln to prevent backfire.

[0030] As a further preferred embodiment, the left end of the core shell 4 is provided with an opening, and the left end of the core shell 4 is connected to the inner side wall of the inner shell 2. Since the right end of the inner ring groove 32 is inclined outward, the right end of the core shell 4 is blocked by the right end of the distribution barrel 3, and the core shell 4 can only be inserted into the distribution barrel 3 from right to left. With this embodiment, the position of the core shell 4 can be fixed by connecting the left end of the core shell 4 to the inner side wall of the inner shell 2.

[0031] As an optional embodiment, a first inclined surface 101 is provided on the inner wall of the outer shell 1 or the outer wall of the inner shell 2. The first inclined surface 101 can reduce the air volume of the outer air film and distribute as much air as possible required for combustion to the premixing device participating in the peripheral device. The setting of the first inclined surface 101 can also reduce the pipe resistance.

[0032] As a further preferred embodiment, the outer shell 1 comprises a left shell 11 and a right shell 12 fixedly connected to each other, and the first inclined surface 101 is provided on the right shell 12. Since the first inclined surface 101 is provided on the inner side wall of the outer shell 1 or the outer side wall of the inner shell 2, the outer shell 1 is divided into the left shell 11 and the right shell 12, so that the first inclined surface 101 can be conveniently processed on the inner side wall of the right shell 12, and when casting the right shell 12, the right shell 12 can be demoulded from one side of the first inclined surface 101. Optionally, the inner shell 2 and the left shell 11 are integrally formed, which can reduce the steps of manufacturing parts.

[0033] As an optional embodiment, a hollow 43 is provided in the core shell 4, and an air inlet hole 41 and an air outlet hole 42 are respectively provided in the left and right parts of the core shell 4, and the air inlet hole 41 and the air outlet hole 42 are both connected to the hollow 43. The igniter 5 is partially arranged in the hollow 43, and the air inlet hole 41 is connected to the inner ring groove 32, and the air outlet hole 42 is arranged beside the head of the igniter 5. Part of the air in the inner ring groove 32 enters the hollow 43 to cool the igniter 5, and the air in the hollow 43 flows out from the air outlet hole 42 to prevent the mixed gas from flowing back into the hollow 43.

[0034] As a further preferred embodiment, the igniter 5 is far away from the axis of the core housing 4. Such an arrangement can reduce the distance between the igniter 5 and the mixed gas, making it easier to ignite the mixed gas.

[0035] As an optional embodiment, a plurality of spacers 33 are provided on the outer side wall of the distribution cylinder 3, and the outer ends of the spacers 33 abut against the inner side wall of the inner shell 2. The purpose of providing the spacers 33 is to reduce the area of ​​the mixed gas outlet and speed up the mixed gas flow rate, while not reducing the gap between the inner shell 2 and the distribution cylinder 3, so as to avoid increasing the difficulty of processing and assembling the inner shell 2 and the distribution cylinder 3.

[0036] As an optional embodiment, the housing is provided with an observation hole 23, the observation hole 23 is communicated with the mixed gas annular groove 22, and a transparent window is sealedly connected to the observation hole 23. The combustion condition in the mixed gas annular groove 22 can be observed through the observation hole 23.

[0037] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An air film protection premix burner, characterized in that: The invention comprises a shell, on which an outer ring groove (112), a mixed gas ring groove (22), and an inner ring groove (32) are arranged from the outside to the inside, and the outer ring groove (112), the mixed gas ring groove (22), and the inner ring groove (32) are all opened to the right. The shell is also provided with a first air inlet (111), a mixed gas inlet (21), and a second air inlet (31) which are respectively connected to the outer ring groove (112), the mixed gas ring groove (22), and the inner ring groove (32), and also comprises an igniter (5), the igniter (5) is connected to the shell, and the head of the igniter (5) is arranged on the inner side of the inner ring groove (32).

2. The gas film protection premix burner according to claim 1, characterized in that: The shell comprises an outer shell (1), an inner shell (2), a distribution tube (3), and a core shell (4) which are sequentially arranged from the outside to the inside; the outer ring groove (112), the mixed gas ring groove (22), and the inner ring groove (32) are respectively arranged between the outer shell (1) and the inner shell (2), between the inner shell (2) and the distribution tube (3), and between the distribution tube (3) and the core shell (4); the igniter (5) is connected to the core shell (4).

3. The gas film protection premix burner according to claim 2 is characterized in that: The right end of the inner ring groove (32) is inclined outward.

4. The gas film protection premix burner according to claim 3 is characterized in that: The left end of the core shell (4) is provided with an opening, and the left end of the core shell (4) is connected to the inner side wall of the inner shell (2).

5. The air film protection premix burner according to claim 2, characterized in that: A first inclined surface (101) is provided on the inner side wall of the outer shell (1) or on the outer side wall of the inner shell (2).

6. The gas film protection premix burner according to claim 5, characterized in that: The outer shell (1) comprises a left shell (11) and a right shell (12) which are fixedly connected to each other, and the first inclined surface (101) is arranged on the right shell (12).

7. The gas film protection premix burner according to claim 2, characterized in that: The core shell (4) is provided with a hollow (43), and the left and right parts of the core shell (4) are respectively provided with an air inlet hole (41) and an air outlet hole (42), and the air inlet hole (41) and the air outlet hole (42) are both connected to the hollow (43). The igniter (5) is partially arranged in the hollow (43), the air inlet hole (41) is connected to the inner ring groove (32), and the air outlet hole (42) is arranged on the side of the head of the igniter (5).

8. The air film protection premix burner according to claim 7, characterized in that: The igniter (5) is arranged away from the axis of the core shell (4).

9. The air film protection premix burner according to claim 2, characterized in that: A plurality of spacers (33) are arranged at intervals on the outer side wall of the distribution cylinder (3), and the outer ends of the spacers (33) abut against the inner side wall of the inner shell (2).

10. The air film protection premix burner according to claim 1, characterized in that: The shell is provided with an observation hole (23), the observation hole (23) is communicated with the mixed gas annular groove (22), and a transparent window is sealedly connected to the observation hole (23).

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