Combustion head of a low-nitrogen burner

Abstract

The present invention discloses a combustion head of a low-nitrogen burner, which solves the problems of insufficient air mixing in the prior art. A mixing channel for mixing gas and air is provided in the cylinder, and the mixing channel is respectively connected to the gas inlet and the air inlet. The gas inlet and the air inlet are located at one end of the cylinder, and the air outlet is located at the other end of the cylinder. A plurality of acute-angled ventilation holes are opened on the flame stabilizing disk along the circumference in the same clockwise direction. The plurality of acute-angled ventilation holes are arranged in multiple rings from the inside to the outside around the center of the flame stabilizing disk. The hole area of ​​the acute-angled ventilation holes gradually decreases from the air inlet side to the air outlet side. The two sides of the longitudinal section at the location of the acute-angled ventilation holes form an acute angle. The exhausted air and gas are mixed, moved and rotated together from the inside to the outside, which is conducive to stirring the gas and air, so that the two are mixed more fully, the combustion efficiency is improved, the emission of nitrogen oxides is reduced, the energy-saving and environmental protection effects are more enhanced, and the temperature rises more quickly.

Description

Technical Field

[0001] The invention relates to the technical field of burners, in particular to a combustion head of a low-nitrogen burner. Background Art

[0002] A burner is a device that mixes (or mixes) gas or atomized fuel with air in a specific spray pattern for combustion. It is widely used in homes and industrial production. The burner head is the core component of the burner, and its structure directly affects its thermal efficiency. Traditional burner heads have a relatively simple structure, where gas is ignited immediately after mixing with the external air. However, the mixing cycle is very short, resulting in an incomplete mixture during combustion. This results in incomplete combustion, low combustion efficiency, slow temperature rise, fuel waste, and the emission of high levels of nitrogen oxides. Summary of the Invention

[0003] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides a combustion head of a low-nitrogen burner to solve the problems of insufficient air mixing and slow temperature rise in the prior art.

[0004] The technical solution of the present invention comprises a cylinder and an ignition rod, the cylinder is provided with a gas inlet, an air inlet and a ventilation outlet, a flame stabilizing disk is provided at the ventilation outlet of the cylinder, the cylinder is provided with a mixing channel for mixing gas and air, the mixing channel is communicated with the gas inlet and the air inlet respectively, the gas inlet and the air inlet are located at one end of the cylinder, and the ventilation outlet is located at the other end of the cylinder; a plurality of acute-angled ventilation holes are provided on the flame stabilizing disk in the same clockwise direction along the circumference, the plurality of acute-angled ventilation holes are arranged in multiple rings from the inside to the outside around the center of the flame stabilizing disk, the hole area of ​​the acute-angled ventilation holes gradually decreases from large to small from the air inlet side to the air outlet side, and the two sides of the longitudinal section at the location of the acute-angled ventilation holes form an acute angle; the ignition rod passes through the mixing channel to the flame stabilizing disk and the ignition nozzle of the ignition rod is located on the air outlet side of the flame stabilizing disk.

[0005] By adopting the above technical solution, the gas and air are directly mixed in the mixing channel, so that the two have sufficient time and place to mix, and the ignition nozzle of the ignition rod is set on the air outlet side of the flame stabilizing disk, so that the combustion position is located outside the flame stabilizing disk, and the flame stabilizing disk is used to isolate and avoid ignition in the mixing channel; the gas and combustion-supporting air form a vortex on the surface of the flame stabilizing disk through the guidance of the sharp-angle ventilation holes, and a spiral flame shape with a good swirl effect can be formed during combustion, and the air flow is discharged from the large hole area to the small hole area to form a high-pressure airflow, and the discharged air and gas are mixed, moved and rotated from the inside to the outside, which is conducive to stirring the gas and air, and the two are mixed more fully, so that the combustible gas burns more fully, improves combustion efficiency, reduces nitrogen oxide emissions, has better energy-saving and environmental protection effects, and the temperature rises faster.

[0006] The present invention is further configured as follows: an inner cylinder is coaxially arranged in the cylinder body, the flame stabilizing disk includes an inner disk and an outer ring, the inner disk is fixedly mounted on the inner cylinder, and the outer ring is fixedly mounted in the cylinder body and located outside the cylinder wall of the inner cylinder.

[0007] With the above-mentioned further arrangement, the gas in the mixing channel will pass through the inner tube and the cylinder body respectively, and the inner and outer sides of the inner tube will be mixed in layers and pumped out to burn on the air outlet side of the flame stabilizing disk, forming a double-layer swirl flame shape, which can disperse the combustion position, ensure that the distributed fuel can be completely burned, reduce the temperature of the flame, effectively reduce the generation of pollutants such as nitrogen oxides, and be more environmentally friendly.

[0008] The present invention is further provided with an adjustment mechanism which can axially move and adjust the inner cylinder.

[0009] By further setting the above, the adjustment mechanism can move the position of the inner cylinder and actually adjust the distance between the inner disk and the outer ring. When the distance between the two is small, the air outlet sides of the inner disk and the outer ring will both burn. During the outward movement of the inner cylinder, the burning flame on the air outlet side of the outer ring will gradually decrease, changing the thickness of the flame at the combustion position. It has the function of adjusting the flame combustion range and realizing graded combustion, which is suitable for working environments where a small amount of flame is required.

[0010] The present invention is further configured as follows: the adjustment mechanism includes a connecting right-angle plate and a stud, one right-angle end of the connecting right-angle plate is fixedly connected to the inner tube, the other right-angle end of the connecting right-angle plate is threadedly connected to the stud, and the bottom surface of the stud is supported on the burner.

[0011] By further adopting the above arrangement, the position of the connecting right-angle plate can be adjusted by rotating the stud, which is a simple and effective design.

[0012] The present invention is further provided with: the air outlets of the cylinder body and the inner cylinder are both provided with constricted openings that shrink toward the center.

[0013] By further configuring the above, the constriction can reduce the flame extension, form a contraction flow channel, strengthen the mixing of the fuel gas and the combustion-supporting air, enhance the spurting and swirl effects of the flame, and make the flame temperature more uniform.

[0014] The present invention is further provided with one side of the longitudinal section where the acute-angle ventilation hole is located being arranged along the axial direction of the flame stabilizing disk, and the other side forming an inclined surface.

[0015] By adopting the above-mentioned further arrangement, the air flow is guided to flow out from the inclined surface, which is conducive to the formation of a swirl effect.

[0016] The present invention is further configured such that the angle is 45°.

[0017] By adopting the above-mentioned further setting, the swirl effect is optimal and the combustion efficiency reaches the peak.

[0018] The present invention is further provided with: the inclined surface extends outwardly toward the air outlet side of the flame stabilizing disk and forms an air outlet side opening between the inclined surface and the air outlet side of the flame stabilizing disk, and the axial spacing between the air outlet side openings is 0.5mm-2mm.

[0019] The above-mentioned further arrangement is adopted to help form a high-pressure airflow, so that the flame appears in a gushing shape.

[0020] The present invention is further provided with the following configuration: the ignition rod passes through the center of the inner disk and the ignition nozzle of the ignition rod is bent in the radial direction.

[0021] With the above further arrangement, the ignition rod is placed in the center to avoid turbulence in the mixing channel, and the ignition rod does not need to be in the flame for a long time, thereby increasing the service life of the ignition rod.

[0022] The present invention is further provided with: a fire detection needle is further installed on the inner disk, and a detection port of the fire detection needle is located on the air outlet side of the inner disk.

[0023] By adopting the above-mentioned further setting, the flame temperature is detected to judge the extreme conditions of the flame, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0025] Figure 2 A partial structural cross-sectional view of a specific embodiment of the present invention;

[0026] Figure 3 A partial cross-sectional view of the air outlet side of the flame stabilizing disk of the present invention;

[0027] Figure 4 This is a schematic structural diagram of the air inlet side of the flame stabilizing disk of the present invention;

[0028] Figure 5 For the present invention Figure 3 A partial enlarged view of point A in the middle;

[0029] Among them, 1. Cylinder; 2. Ignition rod; 11. Mixing channel; 3. Flame stabilizing disk; 31. Sharp-angle ventilation hole; 4. Inner cylinder; 32. Inner disk; 33. Outer ring; 5. Adjustment mechanism; 51. Connecting right-angle plate; 52. Stud; 12. Narrowing; 311. Inclined surface; 312. Air outlet side opening; 313. Bending block; 6. Fire detection needle. DETAILED DESCRIPTION

[0030] like Figure 1-Figure 5The combustion head of a low-nitrogen burner shown in the figure includes a barrel 1 and an ignition rod 2. The barrel 1 is provided with a gas inlet, an air inlet, and a vent outlet. The barrel 1 has a mixing channel 11 for mixing gas and air. The mixing channel 11 is connected to the gas inlet and the air inlet respectively. The gas inlet and the air inlet respectively pump gas and combustion-supporting air into the channel. The vent outlet is located at one end of the barrel 1, and the gas inlet and the air inlet are located at the other end away from the vent outlet. The gas inlet and the air inlet are usually at the outlet position of the burner, which is connected to the mixing channel 11 in the barrel 1. Gas and air can be mixed directly in the mixing channel 11, with sufficient mixing time and space to ensure that the combustion-supporting air can be evenly mixed with the gas. Of course, in order to prevent ignition in the mixing channel 11, a flame stabilizing disk 3 is provided at the vent outlet of the barrel 1. The ignition rod 2 passes through the mixing channel 11 to the flame stabilizing disk 3, and the ignition nozzle of the ignition rod 2 is located on the air outlet side of the flame stabilizing disk 3, so that the ignition position is outside the flame stabilizing disk 3 and is isolated by the flame stabilizing disk 3. When air and gas are pumped in, the flame always burns outside the flame stabilizing disk 3 because the airflow always flows outward and the flame stabilizing disk 3 is isolated. A plurality of acute-angled ventilation holes 31 are provided on the flame stabilizing disk 3 along the circumference in the same clockwise direction. The plurality of acute-angled ventilation holes 31 are arranged in a multi-ring pattern from the inside out around the center of the flame stabilizing disk 3. The hole area of ​​the acute-angled ventilation holes 31 gradually decreases from the air inlet side to the air outlet side, and the two sides of the longitudinal section where the acute-angled ventilation holes 31 are located form an acute angle α. The acute-angled ventilation holes 31 are arranged in the same clockwise direction to guide the exhaust direction to an inclined shape consistent with the air outlet direction, thereby generating a rotating spiral airflow; in addition, the airflow is discharged from the area with a larger hole area to the area with a smaller hole area, forming a uniform high-pressure jet-like airflow, which fully accelerates the mixing of air and gas and accelerates the discharge of the mixed gas.

[0031] An inner cylinder 4 is coaxially arranged inside the cylinder body 1. The inner cylinder 4 extends from approximately the middle of the mixing channel 11 to the vent outlet. Both the cylinder body 1 and the inner cylinder 4 are hollow cylinders. In order to meet the structural design requirements of the inner cylinder 4, the flame stabilizing disk 3 is also configured to have an inner and outer shape. The flame stabilizing disk 3 includes an inner disk 32 and an outer ring 33. The inner disk 32 is fixedly mounted on the inner cylinder 4, and the outer ring 33 is fixedly mounted inside the cylinder body 1 and is located on the outer periphery of the cylinder wall of the inner cylinder 4. During operation, the mixed gas in the mixing channel 11 will pass through the inner cylinder 4 and the cylinder body 1, that is, the mixed gas will be discharged in layers inside and outside the inner cylinder 4, and will burn in layers on the air outlet side of the inner disk 32 and outer ring 33 of the flame stabilizing disk 3, forming a double-layer swirl flame shape, which can disperse the combustion position, ensure that the distributed fuel can be completely burned, and reduce the temperature of the flame.

[0032] The inner cylinder 4 is provided with an adjustment mechanism 5 for axially adjusting the inner cylinder 4. This mechanism comprises a connecting plate 51 and a stud 52. The connecting plate 51 has two right-angled sides. One right-angled side of the connecting plate 51 is fixedly connected to the inner cylinder 4, while the other right-angled side of the connecting plate 51 is threadedly connected to the stud 52. The bottom surface of the stud 52 rests against the burner head. Rotating the stud 52 changes the position of the connecting plate 51 on the stud 52, thereby moving the inner cylinder 4. This mechanism effectively adjusts the spacing between the inner disk 32 and the outer ring 33. When the spacing is small, both the outlet sides of the inner disk 32 and the outer ring 33 will burn. Rotating the stud 52 to move the inner cylinder 4 outward gradually reduces the flame on the outlet side of the outer ring 33, or even allows only the outlet side of the inner disk 32 to burn. This allows the thickness of the flame to be varied, providing an adjustable range of flames and achieving graded combustion.

[0033] The air outlets of both the cylinder 1 and the inner cylinder 4 are provided with a constriction 12 that contracts toward the center. The cross-sectional diameter of the constriction 12 gradually decreases, and the constriction 12 is integrally formed with the corresponding cylinder 1 and inner cylinder 4. The constriction 12 enhances the mixing of the gas and the combustion-supporting air, thereby achieving the purpose of uniform mixing of the gas and air.

[0034] To stabilize the flame shape, one side of the longitudinal section of the acute-angled ventilation hole 31 is arranged along the axial direction of the flame stabilizing disk 3, while the other side forms an inclined surface 311. The axial side avoids disrupting the airflow, allowing the airflow to flow entirely along the inclined surface 311, with a more consistent outflow direction, thus creating a good swirl effect.

[0035] When the angle α is between 30° and 60°, the combustion efficiency is good, and when the angle α is 45°, the combustion efficiency reaches its peak and the swirl effect is excellent.

[0036] The inclined surface 311 extends outwardly toward the air outlet side of the flame stabilizing disk 3 and forms an air outlet side opening 312 between the inclined surface 311 and the air outlet side of the flame stabilizing disk 3. The spacing or size of the air outlet side opening 312 in the axial direction of the flame stabilizing disk 3 is between 0.5 mm and 2 mm. Experimental verification shows that under this axial spacing of the air outlet side openings 312, it is easier to form a high-pressure airflow, and the flame shape is more jet-like.

[0037] Multiple acute-angled vent holes 31 are evenly distributed along the circumference of the flame stabilizing disk 3. The multiple rings of acute-angled vent holes 31 are arranged densely inward and sparsely outward from the center of the flame stabilizing disk 3. The acute-angled vent holes 31 are formed by stamping and bending from the air inlet side to the air outlet side. The bottom surface of the stamped bent block 313 is an inclined surface 311, and the stamped fracture surface is a flat surface in the axial direction of the flame stabilizing disk 3.

[0038] Ignition rod 2 passes through the center of inner disk 32, and its ignition nozzle is bent radially outward. The ignition nozzle is located in the main combustion area on the air outlet side of inner disk 32. The central location of ignition rod 2 in inner disk 32 prevents turbulence in mixing channel 11 and eliminates the need for ignition rod 2 to remain within the flame for a long time, thereby increasing the service life of ignition rod 2.

[0039] A flame detector pin 6 is also mounted on the inner disk 32, with its detection port located on the air outlet side of the inner disk 32. When heated by the flame, the flame detector pin 6 generates ions, which can be detected using an ion current detection method. Different temperatures of the flame detector pin 6 correspond to different ion intensities, enabling flame temperature detection to be used to determine extreme flame conditions and prevent safety accidents.

Claims

1. A combustion head of a low-nitrogen burner, comprising a cylinder and an ignition rod, wherein the cylinder is provided with a gas inlet, an air inlet, and a vent outlet, and a flame stabilizing disk is provided at the vent outlet of the cylinder, characterized in that: The cylinder is provided with a mixing channel for mixing gas and air, the mixing channel being connected to a gas inlet and an air inlet respectively, the gas inlet and the air inlet being located at one end of the cylinder, and the ventilation outlet being located at the other end of the cylinder; a plurality of acute-angled ventilation holes are provided on the flame stabilizing disk in the same clockwise direction along the circumference, and the plurality of acute-angled ventilation holes are arranged in multiple rings from the inside to the outside around the center of the flame stabilizing disk, and the hole area of ​​the acute-angled ventilation holes gradually decreases from the air inlet side to the air outlet side, and the two sides of the longitudinal section at the location of the acute-angled ventilation holes form an acute angle; the ignition rod passes through the mixing channel to the flame stabilizing disk, and the ignition nozzle of the ignition rod is located on the air outlet side of the flame stabilizing disk; An inner cylinder is coaxially arranged in the cylinder body, and the flame stabilizing disk includes an inner disk and an outer ring, wherein the inner disk is fixedly mounted on the inner cylinder, and the outer ring is fixedly mounted in the cylinder body and is located on the outer periphery of the cylinder wall of the inner cylinder; The inner cylinder is provided with an adjusting mechanism which can axially move and adjust the inner cylinder.

2. The combustion head of the low nitrogen burner according to claim 1 is characterized in that: The adjustment mechanism includes a connecting right-angle plate and a stud. The end of a right-angle side of the connecting right-angle plate is fixedly connected to the inner cylinder, and the other right-angle side of the connecting right-angle plate is threadedly connected to the stud. The bottom surface of the stud is supported on the burner.

3. The combustion head of the low nitrogen burner according to claim 1 is characterized in that: The air outlets of the cylinder and the inner cylinder are both provided with constricted openings that shrink toward the center.

4. The combustion head of the low nitrogen burner according to claim 1 is characterized in that: One side of the longitudinal section at the location of the acute-angle ventilation hole is arranged along the axial direction of the flame stabilizing disk, and the other side forms an inclined surface.

5. The combustion head of the low nitrogen burner according to claim 4 is characterized in that: The angle is 45°.

6. The combustion head of the low nitrogen burner according to claim 4 is characterized in that: The inclined surface extends outwardly toward the air outlet side of the flame stabilizing disk and forms an air outlet side opening between the inclined surface and the air outlet side of the flame stabilizing disk. The axial spacing between the air outlet side openings is 0.5 mm to 2 mm.

7. The combustion head of the low nitrogen burner according to claim 1 is characterized in that: The ignition rod passes through the center of the inner disk and the ignition nozzle of the ignition rod is bent in the radial direction.

8. The combustion head of the low nitrogen burner according to claim 7, characterized in that: A fire detection needle is also installed on the inner disk, and the detection port of the fire detection needle is located on the air outlet side of the inner disk.

Images