An ultra-low nitrogen burner

Abstract

The present invention provides an ultra-low nitrogen burner head, which belongs to the field of mechanical technology. It solves the problem of unstable flame of existing burner heads. The ultra-low nitrogen burner head includes a sealing plate, a cylinder and an anti-flashback unit. There are at least two cylinders, and the number of anti-flashback units is the same as that of the cylinders. The anti-flashback units and the cylinders are alternately distributed front and back along the axial direction of the cylinder. The anti-flashback unit includes a plurality of ring bodies distributed along the axial direction of the cylinder. A ring portion is integrally formed on the rear side surface of the sealing plate, and the ring portion is inserted into the frontmost ring body and closes the front end of the ring body; an annular exhaust groove is formed between the sealing plate, the ring portion and the frontmost ring body, and an annular closed cavity is formed between the outer wall of the ring portion and the frontmost ring body. A circle of exhaust holes one connected to the closed cavity is radially penetrated on the side wall of the ring portion, and a circle of exhaust holes two are axially penetrated on the ring body, and the closed cavity and the exhaust groove are connected through the exhaust hole two. The flame of the ultra-low nitrogen burner head burns stably.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a combustion head, in particular to an ultra-low nitrogen combustion head. Background Art

[0002] Low nitrogen burner, by adjusting the combustion air and combustion head, to obtain the best combustion parameters.

[0003] The combustion head is an important component of the burner, and its structure is like a low-nitrogen combustion head previously proposed by the applicant (application number: 202010265857.1). The low-nitrogen combustion head includes a cylinder and an annular anti-flashback unit. There are at least two cylinders, and the number of anti-flashback units is the same as that of cylinders. The cylinders and the anti-flashback units are alternately distributed along the axial direction of the cylinder. The two ends of the anti-flashback unit are respectively an inlet and an outlet, and the outlet of the anti-flashback unit at the end is closed by a sealing plate. It is characterized in that a plurality of exhaust holes are provided on the side wall of the cylinder between two adjacent anti-flashback units, and the exhaust holes are arranged to penetrate the cylinder in the radial direction, and the multiple exhaust holes on the same cylinder are evenly spaced along the circumference of the cylinder.

[0004] When the above-mentioned burner head is used with a large air volume, there is a relatively high wind pressure and wind speed in the front section of the burner head, which can easily cause over-oxygenation and flameout, and the above-mentioned situation is more obvious in winter when the air pressure is reduced. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the prior art and to propose an ultra-low nitrogen burner with stable flame combustion.

[0006] The objectives of the present invention can be achieved through the following technical solutions: an ultra-low nitrogen burner head, comprising a sealing plate, a cylinder and an anti-flashback unit, at least two cylinders, the anti-flashback units and the cylinders are the same in number, and the anti-flashback units and the cylinders are alternately distributed front and back along the axial direction of the cylinder, the anti-flashback unit comprises a plurality of ring bodies distributed along the axial direction of the cylinder, characterized in that a ring portion is integrally formed on the rear side surface of the sealing plate, the ring portion is inserted into the frontmost ring body and closes the front end of the ring body; an annular exhaust groove is formed between the sealing plate, the ring portion and the frontmost ring body, an annular closed cavity is formed between the outer wall of the ring portion and the frontmost ring body, a circle of exhaust holes one connected to the closed cavity is radially penetrated on the side wall of the ring portion, a circle of exhaust holes two is axially penetrated on the ring body, and the closed cavity and the exhaust groove are connected through the above-mentioned exhaust holes two.

[0007] When in use, the combustible gas containing fuel gas flows in from the cylinder at the rear and flows forward, and cooperates through the exhaust hole 1, the closed cavity, the exhaust hole 2 and the exhaust groove to form an exhaust channel that connects the inside of the burner head with the outside, so that a small amount of wind in the front section of the burner head overflows, thereby reducing the wind pressure and wind speed at the front section of the burner head, ensuring stable and uniform combustion at the front section of the burner head.

[0008] In the above-mentioned ultra-low nitrogen burner head, the above-mentioned exhaust groove is composed of a front groove surface, a rear groove surface, and a groove bottom surface located between the front groove surface and the rear groove surface. Both the front groove surface and the rear groove surface are flat and distributed along the axial direction of the cylinder body. The front orifice of the above-mentioned exhaust hole two is located on the rear groove surface. The axial cross-section of the exhaust groove is generally in a "U" shape, which causes the overflowing wind to disperse around the exhaust groove, effectively preventing the wind from moving backward and blocking the outward overflow of the wind at the flame-retardant unit, and further ensuring the stability of flame combustion.

[0009] In the above-mentioned ultra-low nitrogen burner head, the number of exhaust holes two is more than that of exhaust holes one, so as to divide the wind flowing into the closed cavity into smaller groups and discharge them outward, making the wind disperse outward faster and further preventing the influence on flame combustion.

[0010] In the above-mentioned ultra-low nitrogen burner head, a ring-shaped groove is formed on the inner wall of the frontmost ring body, and the above-mentioned closed cavity is formed between the groove and the outer wall of the ring part, maximizing the depth of the exhaust groove and further blocking the wind flowing out of the exhaust hole two from moving backward.

[0011] In the above-mentioned ultra-low nitrogen burner head, the outer side surface and the end surface of the ring part are tightly pressed against the inner wall of the frontmost ring body to form a seal, which has the advantages of simple structure and convenient installation.

[0012] In the above-mentioned ultra-low nitrogen burner head, a plurality of small holes are provided on the side wall of the cylinder body between two adjacent flame-retardant units, which can quickly and stably discharge a small part of the wind with gas, ensuring uniform and sufficient distribution of gas on the outer surfaces of two adjacent flame-retardant units, not being easily flameout under high wind pressure, and increasing the stability of flame combustion.

[0013] In the above-mentioned ultra-low nitrogen burner head, the small holes are arranged at the rear end of the cylinder body, so that the combustible gas diffused in the rear section of the burner head is as unlikely to be flameout as possible. At the same time, the diffused air pressure can suppress the flameout phenomenon when the small holes are radially ejected, further improving the stability of the rear-section flame combustion.

[0014] In the above-mentioned ultra-low nitrogen burner head, a plurality of small holes form a plurality of hole units distributed along the axial direction of the cylinder body, and each hole unit includes a plurality of the above-mentioned small holes evenly distributed along the circumferential direction of the cylinder body to further improve the combustion stability of the rear section of the burner head.

[0015] In the above-mentioned ultra-low nitrogen burner head, the positions of the small holes in two adjacent hole units are arranged staggeredly, so that the combustible gas is more evenly distributed on the outer surface of the cylinder body, further enhancing the stability of flame combustion.

[0016] Compared with the prior art, the present ultra-low nitrogen burner head has the following advantages:

[0017] 1. Through the cooperation of exhaust hole 1, closed cavity, exhaust hole 2 and exhaust groove, an exhaust passage is formed to connect the inside and outside of the burner head, so that a small amount of wind in the front section of the burner head can overflow to reduce the wind pressure and wind speed at the front section of the burner head, ensuring stable and uniform combustion at the front section of the burner head.

[0018] 2. There are multiple small holes on the side wall of the cylinder between two adjacent anti-flashback units, which can allow a small amount of wind containing gas to be discharged quickly and stably, ensuring that the gas on the outer surface of the two adjacent anti-flashback units is evenly and adequately distributed, making it difficult to flame out under high wind pressure, thereby increasing the stability of flame combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the ultra-low nitrogen burner head.

[0020] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0021] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the ultra-low nitrogen burner head.

[0023] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure at point C in the middle.

[0024] Figure 6 It is a three-dimensional structural schematic diagram of the sealing plate.

[0025] In the figure, 1, sealing plate; 1a, ring; 1b, exhaust hole 1; 2, cylinder; 2a, small hole; 3, anti-backfire unit; 3a, ring; 3a1, exhaust hole 2; 3b, fire stop ring; 4, connecting rod; 5, exhaust groove; 5a, rear groove surface; 5b, front groove surface; 6, closed cavity. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figure 1 As shown, the ultra-low nitrogen burner head includes a sealing plate 1, a cylinder 2 and an anti-flashback unit 3.

[0028] in,

[0029] There are at least two cylinders 2, and the number of anti-flashback units 3 is the same as that of cylinders 2, and the anti-flashback units 3 and cylinders 2 are alternately distributed front and back along the axial direction of the cylinder 2. In actual products, the cylinders 2 are cylindrical and the number is 2, and at this time, the number of anti-flashback units 3 is also 2. Naturally, the number of cylinders 2 can also be determined according to the actual application environment, and it can be 3, 4, 5, etc.

[0030] The anti-flashback unit 3 is an existing structure, and its specific structure is the anti-flashback unit involved in a low-nitrogen combustion head [Application No.: 202010265857.1] previously proposed by the applicant, such as Figure 2 and Figure 5 As shown, the anti-flashback unit 3 includes a plurality of ring bodies 3a distributed axially along the cylinder 2 and a fire stop ring 3b clamped between two adjacent ring bodies 3a.

[0031] like Figure 4 As shown, the sealing plate 1 is located in front of the frontmost ring body 3a, and the sealing plate 1, the anti-flashback unit 3 and the cylinder 2 are connected in the following manner: a connecting rod 4 is arranged in the cylinder 2 at the rear, and the length of the connecting rod 4 extends along the axial direction of the cylinder 2. There are at least two connecting rods 4 and they are evenly spaced along the circumference of the cylinder 2. The front end of the connecting rod 4 extends forward to be fixedly connected to the sealing plate 1, and all the ring bodies 3a and the remaining cylinders 2 are fixedly connected to the connecting rod 4. Preferably, the fire stop ring 3b is also fixedly connected to the connecting rod 4, which not only makes the entire burner head structure more stable, but also facilitates the assembly of the burner head.

[0032] In this embodiment, the ring body 3 a , the cylinder body 2 , the fire stop ring 3 b and the sealing plate 1 are all welded and fixedly connected to the connecting rod 4 .

[0033] Naturally, the fire stop ring 3b and the ring body 3a are first welded to form the anti-backfire unit 3, and then the anti-backfire unit 3 is welded and fixedly connected to the cylinder 2 or the sealing plate 1, so that the assembly of the ring body 3a, the cylinder 2, the fire stop ring 3b and the sealing plate 1 can be realized in the same way.

[0034] like Figure 3 , Figure 5 and Figure 6 As shown, a ring portion 1a is integrally formed on the rear side of the sealing plate 1, and the ring portion 1a and the ring body 3a are coaxially arranged. The ring portion 1a is inserted into the ring body 3a at the front and closes the front end of the ring body 3a. At this time, an annular exhaust groove 5 is formed between the sealing plate 1, the ring portion 1a and the ring body 3a at the front, and an annular closed cavity 6 is formed between the outer wall of the ring portion 1a and the ring body 3a at the front. A circle of exhaust holes 1b connected to the closed cavity 6 is radially penetrated on the side wall of the ring portion 1a, that is, multiple exhaust holes 1b are evenly distributed along the circumference of the ring portion 1a; a circle of exhaust holes 2 3a1 is axially penetrated on the ring body 3a, that is, the exhaust holes 2 3a1 are evenly distributed along the circumference of the ring body 3a, and the closed cavity 6 and the exhaust groove 5 are connected through the above-mentioned exhaust holes 2 3a1. Preferably, the exhaust holes 1b and the exhaust holes 2 3a1 are both circular holes.

[0035] During use, the combustible gas containing gas flows into the cylinder body 2 at the rearmost position and flows forward. Through the cooperation of the first exhaust hole 1b, the closed cavity 6, the second exhaust hole 3a1 and the exhaust groove 5, an exhaust passage for communicating the inside and outside of the burner head is formed, so that a small amount of wind in the front section of the burner head overflows outward, reducing the wind pressure and wind speed at the front section of the burner head, and ensuring stable and uniform combustion at the front section of the burner head.

[0036] Among them,

[0037] The axial section of the exhaust groove 5 is generally in a "U" shape. The exhaust groove 5 is composed of a front groove surface 5b, a rear groove surface 5a and a groove bottom surface between the front groove surface 5b and the rear groove surface 5a. The front groove surface 5b and the rear groove surface 5a are both flat and distributed along the axial direction of the cylinder body 2. The front orifice of the second exhaust hole 3a1 is located on the rear groove surface 5a, prompting the overflowing wind to disperse around the exhaust groove 5, effectively preventing the wind from moving backward to block the outward overflow of the wind at the flame arrester unit 3, and further ensuring the stability of flame combustion.

[0038] The forming method of the closed cavity 6 is as follows: The outer side surface and the end surface of the ring portion 1a are tightly pressed against the inner wall of the ring body 3a at the foremost position to form a seal. A ring-shaped groove is formed on the inner wall of the ring body 3a at the foremost position, and the above-mentioned closed cavity 6 is formed between the groove and the outer wall of the ring portion 1a, maximizing the depth of the exhaust groove 5 and further blocking the wind flowing out of the second exhaust hole 3a1 from moving backward.

[0039] Furthermore, the second exhaust hole 3a1 and the first exhaust hole 1b have the same aperture, and the number of the second exhaust holes 3a1 is more than that of the first exhaust holes 1b, so as to divide the wind flowing into the closed cavity 6 into smaller groups and discharge them outward, making the wind disperse outward faster and further avoiding affecting flame combustion. In the actual product, the number of the first exhaust holes 1b is 20, and the number of the second exhaust holes 3a1 is 90.

[0040] As Figure 2 and Figure 4 shown, a plurality of small holes 2a are provided on the side wall of the cylinder body 2 between two adjacent flame arrester units 3, and the small holes 2a are arranged at the rear end of the cylinder body 2, which can quickly and stably discharge a small part of the wind with gas, ensuring uniform and sufficient distribution of gas on the outer surfaces of two adjacent flame arrester units 3, not easily causing flame detachment under high wind pressure, and increasing the stability of flame combustion.

[0041] Furthermore, the plurality of small holes 2a form a plurality of hole units distributed along the axial direction of the cylinder body 2. Each hole unit includes a plurality of the above-mentioned small holes 2a evenly distributed along the circumferential direction of the cylinder body 2, and the positions of the small holes 2a in two adjacent hole units are staggered, so as to further improve the combustion stability at the rear section of the burner head. In this embodiment, the aperture of the small hole 2a is 2 mm to 3 mm, and preferably this aperture is 2.5 mm.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An ultra-low nitrogen burner head, comprising a sealing plate (1), a cylinder (2) and an anti-flashback unit (3), wherein the cylinder (2) has at least two anti-flashback units (3) and the cylinder (2) have the same number, and the anti-flashback units (3) and the cylinder (2) are alternately distributed front and back along the axial direction of the cylinder (2), and the anti-flashback unit (3) comprises a plurality of ring bodies (3a) distributed along the axial direction of the cylinder (2), characterized in that: A ring portion (1a) is integrally formed on the rear side surface of the sealing plate (1), and the ring portion (1a) is inserted into the annular body (3a) at the front and closes the front end of the annular body (3a); an annular exhaust groove (5) is formed between the sealing plate (1), the ring portion (1a) and the annular body (3a) at the front, and an annular closed cavity (6) is formed between the outer wall of the ring portion (1a) and the annular body (3a) at the front, a circle of exhaust holes (1b) communicating with the closed cavity (6) is radially penetrated on the side wall of the ring portion (1a), and a circle of exhaust holes (3a1) axially penetrated on the annular body (3a), and the closed cavity (6) and the exhaust groove (5) are connected through the exhaust holes (3a1), and the number of the exhaust holes (3a1) is greater than the exhaust holes (1b).

2. The ultra-low nitrogen burner head according to claim 1, characterized in that: The exhaust groove (5) is composed of a front groove surface (5b), a rear groove surface (5a) and a groove bottom surface between the front groove surface (5b) and the rear groove surface (5a). The front groove surface (5b) and the rear groove surface (5a) are both planes and are distributed along the axial direction of the cylinder (2). The front opening of the second exhaust hole (3a1) is located on the rear groove surface (5a).

3. The ultra-low nitrogen burner head according to claim 1, characterized in that: An annular groove is formed on the inner wall of the annular body (3a) at the front, and the above-mentioned closed cavity (6) is formed between the groove and the outer wall of the annular portion (1a).

4. The ultra-low nitrogen burner head according to claim 1, characterized in that: The outer side surface and the end surface of the ring portion (1a) are tightly pressed against the inner wall of the ring body (3a) located at the front to form a seal.

5. The ultra-low nitrogen burner head according to claim 1, characterized in that: A plurality of small holes (2a) are arranged on the side wall of the cylinder (2) between two adjacent anti-flashback units (3).

6. The ultra-low nitrogen burner head according to claim 5, characterized in that: The small hole (2a) is arranged at the rear end of the cylinder (2).

7. The ultra-low nitrogen burner head according to claim 5, characterized in that: The plurality of small holes (2a) form a plurality of hole units distributed along the axial direction of the cylinder (2), and each hole unit comprises a plurality of the above-mentioned small holes (2a) uniformly distributed along the circumference of the cylinder (2).

8. The ultra-low nitrogen burner head according to claim 7, characterized in that: The small holes (2a) in two adjacent hole units are arranged in staggered positions.

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