Burner air duct turbulence improvement device

Abstract

The present invention discloses a burner air duct turbulence improvement device, comprising a flow guide mechanism, a flow collecting mechanism, a turbulence mechanism, and a flow regulator coaxially mounted in the burner air duct. The flow guide mechanism comprises a flow guide shaft end, a shaft end sleeve, and flow guide vanes, wherein the flow guide shaft end is mounted at the front end of the shaft end sleeve, and the shaft end sleeve is provided with flow guide vanes. The flow collecting mechanism comprises an air duct outer tube, flow collecting vanes, and a shaft sleeve, wherein the shaft sleeve is connected to the shaft end sleeve, the shaft sleeve is located inside the air duct outer tube, and flow collecting vanes are located between the shaft sleeve and the air duct outer tube. The turbulence mechanism comprises a rotating shaft, a rotating shaft sleeve mounted on the rotating shaft, and a fixed shaft sleeve, wherein one end of the rotating shaft is rotatably connected to the shaft sleeve and the other end is rotatably connected to the flow regulator, the rotating shaft sleeve is provided with a spiral vane, the fixed shaft sleeve is fixed to the rotating shaft sleeve, and the fixed shaft sleeve is provided with a wind pressure sensor. The present invention stabilizes the airflow involved in burner combustion, thereby achieving the purpose of stabilizing the combustion flame, improving the combustion calorific value, and reducing fuel consumption.

Description

Technical Field

[0001] The invention relates to a burner air duct turbulence improvement device, belonging to the technical field of asphalt mixture stirring equipment. Background Art

[0002] Asphalt mixing plants usually use burners to heat aggregates, so the heating capacity of the burner directly affects the temperature rise of the aggregate and the performance of the finished material. At the same time, whether the burner burns fully also has a key impact on the content of harmful substances in the exhaust gas.

[0003] At present, during the blowing process of the burner fan, due to the bending of the pipe or the uneven distribution of components inside the air duct, the wind speed and air volume inside the air duct are unevenly distributed, and the wind pressure difference on the same plane is too large, which leads to the local combustion of the burner flame being insufficient or the fuel being unable to participate in combustion when the wind speed is high. Summary of the Invention

[0004] In response to the problems existing in the above-mentioned prior art, the present invention provides a burner air duct turbulence improvement device to solve the problems of unstable burner flame and insufficient local combustion caused by airflow turbulence, thereby achieving sufficient and stable combustion of the burner and increasing the combustion efficiency of the burner.

[0005] In order to achieve the above-mentioned object, the present invention adopts a burner air duct turbulence improvement device, which includes a flow guide mechanism, a flow collecting mechanism, a turbulence mechanism and a flow regulator coaxially installed in the burner air duct in sequence;

[0006] The guide mechanism includes a guide shaft end, a shaft end sleeve and guide blades. The guide shaft end is installed at the front end of the shaft end sleeve, and a plurality of guide blades are evenly distributed on the shaft end sleeve.

[0007] The flow collecting mechanism includes an outer tube of the air duct, flow collecting blades and a shaft sleeve, wherein the shaft sleeve is connected to the shaft end sleeve, the shaft sleeve is located inside the outer tube of the air duct, and a plurality of flow collecting blades are evenly distributed between the shaft sleeve and the outer tube of the air duct;

[0008] The turbulence mechanism includes a rotating shaft, a rotating sleeve and a fixed sleeve respectively installed on the rotating shaft, one end of the rotating shaft is rotatably connected to the shaft sleeve, and the other end is rotatably connected to the flow adjuster, a spiral blade is installed on the rotating sleeve, and the spiral blade and the rotating sleeve rotate synchronously with the rotating shaft, the fixed sleeve is fixed to the rotating sleeve by a thread, and a wind pressure sensor is installed on the fixed sleeve.

[0009] As an improvement, the guide vane is a three-dimensional flow vane, and the shape of the guide shaft end is a parabolic cone.

[0010] As an improvement, the collector blades are in the shape of an airfoil.

[0011] As an improvement, the interior of the rotating sleeve is serrated.

[0012] As an improvement, a blade sheath is installed at the end of the spiral blade.

[0013] As an improvement, the flow regulator has a five-layer hole structure.

[0014] As an improvement, mounting seats are provided at both ends of the outer tube of the air duct.

[0015] As an improvement, the flow collecting mechanism is welded to the inner wall of the burner air duct through the air duct outer tube, and the flow regulator is welded to the inner wall of the burner air duct.

[0016] Compared with the prior art, the burner air duct turbulence improvement device of the present invention includes a guide mechanism, a collecting mechanism, a turbulence mechanism and a flow adjuster. The airflow first passes through the fan and enters the guide mechanism for local flow compensation. Then the airflow enters the collecting mechanism, the turbulence mechanism and the flow adjuster in sequence from the guide mechanism, and finally reduces the degree of airflow turbulence, thereby making the airflow participating in the burner combustion stable, achieving the purpose of stabilizing the combustion flame, improving the combustion calorific value and reducing fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 Schematic diagram of the structure of the guide vane in the present invention;

[0019] Figure 3 Schematic diagram of the assembly of the guide vane and the guide shaft end in the present invention;

[0020] Figure 4 Schematic diagram of the structure of the current collecting mechanism in the present invention;

[0021] Figure 5 Schematic diagram of the assembly of the flow guiding mechanism and the flow collecting mechanism in the present invention;

[0022] Figure 6 Schematic diagram of the structure of the turbulent flow mechanism in the present invention;

[0023] Figure 7 Schematic diagram of the structure of the blade sheath in the present invention;

[0024] Figure 8 Schematic diagram of the structure of the spiral blade in the present invention;

[0025] Figure 9 Schematic diagram of the structure of the rotating shaft sleeve and the fixed shaft sleeve in the present invention;

[0026] Figure 10Schematic diagram of the three-dimensional structure of the flow regulator in the present invention;

[0027] In the figure: 1. guide mechanism, 11. anti-loosening bolt, 12. guide shaft end, 13. guide blade, 14. shaft end sleeve; 2. collecting mechanism, 21. air duct outer tube, 22. collecting blade, 23. shaft sleeve; 3. turbulence mechanism, 31. rotating shaft, 32. shaft shoulder, 33. rotating shaft sleeve, 34. spiral blade, 35. blade sleeve, 36. fixed shaft sleeve, 37. wind pressure sensor; 4. flow adjuster. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below. However, it should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] In the description of the present invention, it should be understood that the terms "front", "rear", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection content of the present invention.

[0031] like Figures 1-10 As shown, a burner air duct turbulence improvement device includes a flow guide mechanism 1, a flow collecting mechanism 2, a turbulence mechanism 3 and a flow regulator 4 coaxially installed in the burner air duct from front to back;

[0032] The guide mechanism 1 includes a guide shaft end 12, a shaft end sleeve 14 and guide vanes 13. The guide shaft end 12 is mounted at the front end of the shaft end sleeve 14. The shaft end sleeve 14 is evenly distributed with a plurality of guide vanes 13 for axially weakening the airflow, radially strengthening the airflow and converging the airflow toward the center of the pipe.

[0033] The flow collecting mechanism 2 includes an outer tube 21 of the air duct, flow collecting blades 22 and a shaft sleeve 23. The shaft sleeve 23 is connected to the shaft end sleeve 14 and is located inside the outer tube 21 of the air duct. A plurality of flow collecting blades 22 are evenly distributed between the shaft sleeve 23 and the outer tube 21 of the air duct to strengthen the airflow axially, weaken it radially and ensure uniform circulation. The shaft sleeve 23 is a hollow structure for mounting a rotating bearing.

[0034] The turbulence mechanism 3 includes a rotating shaft 31, a rotating sleeve 33 and a fixed sleeve 36 respectively installed on the rotating shaft 31, one end of the rotating shaft 31 is connected to the rotating bearing in the shaft sleeve 23, and the other end is rotatably connected to the flow adjuster 4, the rotating sleeve 33 is provided with a spiral blade 34, the spiral blade 34 can rotate synchronously with the rotating sleeve 33 on the rotating shaft 31, the fixed sleeve 36 is fixed to the rotating sleeve 33 by a thread, and a wind pressure sensor 37 is installed on the fixed sleeve 36, the wind pressure sensor 37 is used to detect the wind pressure in the same area, the controller receives the wind pressure signal of the wind pressure sensor 37, and controls the external burner servo motor to drive the rotating shaft 31 to drive the spiral blade 34 to rotate, thereby adjusting the wind pressure to ensure that the output wind pressure difference is within the required range, the rotating shaft 31 is provided with a shaft shoulder 32, and the rotating sleeve 33 is limited by the shaft shoulder 32.

[0035] As an improvement of the embodiment, Figure 2 、 Figure 3 and Figure 5 As shown, the shape curve of the guide blade 13 is similar to that of a three-dimensional flow blade, and has strong fluid flowability. The blade molding curvature conforms to fluid dynamics and can reduce pressure loss; the shape of the guide shaft end 12 is a parabolic cone, and its curvature is similar to that of a bullet head. The guide shaft end 12 can reduce the pressure loss during the diversion process and reduce the possibility of vortexes generated by changes in Reynolds parameters, and is easy to install and use the anti-loosening bolt 11 to fasten the guide shaft end 12 to the front end of the shaft end sleeve 14.

[0036] As an improvement of the embodiment, Figure 4 As shown, the shape of the collecting blade 22 is an airfoil, which can reduce the loss of wind speed and wind pressure while ensuring the change of wind direction.

[0037] As an improvement of the embodiment, Figure 8 、 Figure 9 As shown, the interior of the rotating sleeve 33 is serrated, and the rotating shaft 31 is provided with matching serrations. By relying on the serration transmission, the torque between the rotating sleeve 33 and the rotating shaft 31 can be increased, thereby improving the rotation transmission efficiency.

[0038] As an improvement of the embodiment, Figure 6 、 Figure 7 As shown, a blade sheath 35 is installed at the end of the spiral blade 34. When a high-speed airflow passes through the spiral blade 34, since the spiral blade 34 is only connected to the rotating shaft sleeve 33, the spiral blade 34 and the high-speed airflow will induce high-frequency vibration, which can easily damage the spiral blade 34 and other sensor components. Therefore, adding the blade sheath 35 to the spiral blade 34 can increase the strength of the spiral blade 34.

[0039] As an improvement of the embodiment, Figure 10 As shown, the flow conditioner 4 utilizes a Zanker flow conditioner, a five-layered structure characterized by short length, compact size, light weight, and flexible assembly and disassembly. It also boasts strong flow rectification capabilities and reduces the impact effect caused by the through-holes. The rectified airflow achieves approximately the same velocity and pressure at the same radial position, within acceptable tolerances. After passing through the flow conditioner 4 and entering the burner ignition zone, the airflow achieves fully stable burner combustion and increases burner efficiency.

[0040] As an improvement of the embodiment, Figure 5 As shown, mounting seats are provided at both ends of the air duct outer tube 21, which can be assembled with the burner or used alone on the burner.

[0041] During installation, the collecting mechanism 2 is welded to the inner wall of the burner air duct through the air duct outer tube 21, the flow adjuster 4 is welded to the inner wall of the burner air duct, the rotating shaft 31 is rotatably installed between the collecting mechanism 2 and the flow adjuster 4, and the axial end sleeve 14 of the guide mechanism 1 is fixed on the axial sleeve 23 of the collecting mechanism 2.

[0042] When in use, the flow guide mechanism 1, the flow collecting mechanism 2, and the flow regulator 4 are all fixed, and the spiral blades 34 on the turbulent flow mechanism 3 can rotate synchronously with the rotating shaft 31;

[0043] Specifically, during the blowing process of the burner fan, it is inevitable that due to the bending of the pipe or the uneven distribution of the components inside the air duct, the wind speed and air volume inside the air duct are unevenly distributed, and the wind pressure difference on the same plane is too large. The airflow enters from the axial direction of the guide mechanism 1, and under the action of the guide blade group, the airflow is weakened in the axial direction and strengthened in the radial direction, and the airflow is gathered to the center of the pipe. The guide blade group is fixed to ensure that the stable airflow completely enters the guide mechanism 1. After the airflow converges at the collecting mechanism 2, the collected airflow is strengthened in the axial direction and weakened in the radial direction by the collecting blade group, so that the airflow can continue to circulate evenly from all sides of the pipe. The collecting blades 22 are fixed in the cylinder and the turbulent air duct, which can make the airflow transmission process more uniform and reduce the pressure difference of the airflow on the same plane.

[0044] The function of the turbulence mechanism 3 is to fine-tune the airflow in the duct and compensate for the wind speed in the duct. After the airflow enters the turbulence mechanism 3 from the flow collecting mechanism 2, the wind pressure in the same area is detected by the wind pressure sensor 37 installed on the fixed shaft sleeve 36. The controller controls the external burner servo motor to drive the spiral blade 34 to rotate according to the signal of the wind pressure sensor 37, thereby adjusting the wind pressure to ensure that the output wind pressure difference is within the range.

[0045] After the airflow flows out from the spiral blade group, it is adjusted by the Zanker flow regulator and then enters the ignition zone of the burner. The Zanker flow regulator is fixed on the air duct to ensure that the axial velocity of the airflow is reduced to 0 while increasing the radial airflow velocity.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A burner air duct turbulence improvement device, characterized in that: It comprises a flow guide mechanism (1), a flow collecting mechanism (2), a turbulent flow mechanism (3) and a flow regulator (4) which are coaxially installed in sequence in the air duct of the burner; The flow guide mechanism (1) comprises a flow guide shaft end (12), a shaft end sleeve (14) and flow guide blades (13); the flow guide shaft end (12) is mounted on the front end of the shaft end sleeve (14); and a plurality of flow guide blades (13) are evenly distributed on the shaft end sleeve (14); The flow collecting mechanism (2) comprises an air duct outer tube (21), flow collecting blades (22) and a shaft sleeve (23); the shaft sleeve (23) is connected to the shaft end sleeve (14); the shaft sleeve (23) is located inside the air duct outer tube (21); and a plurality of the flow collecting blades (22) are evenly distributed between the shaft sleeve (23) and the air duct outer tube (21); The turbulence mechanism (3) comprises a rotating shaft (31), a rotating shaft sleeve (33) and a fixed shaft sleeve (36) respectively mounted on the rotating shaft (31); one end of the rotating shaft (31) is rotatably connected to the shaft sleeve (23), and the other end is rotatably connected to the flow regulator (4); a spiral blade (34) is mounted on the rotating shaft sleeve (33); the spiral blade (34) and the rotating shaft sleeve (33) rotate synchronously with the rotating shaft (31); the fixed shaft sleeve (36) is fixed to the rotating shaft sleeve (33) by a thread; and a wind pressure sensor (37) is mounted on the fixed shaft sleeve (36).

2. The burner air duct turbulence improvement device according to claim 1, characterized in that: The guide blade (13) is a three-dimensional flow blade, and the shape of the guide shaft end (12) is a parabolic cone.

3. The burner air duct turbulence improvement device according to claim 1, characterized in that: The collector blade (22) is in the shape of an airfoil.

4. The burner air duct turbulence improvement device according to claim 1, characterized in that: The interior of the rotating sleeve (33) is sawtooth-shaped.

5. The burner air duct turbulence improvement device according to claim 1, characterized in that: The end of the spiral blade (34) is provided with a blade sheath (35).

6. The burner air duct turbulence improvement device according to claim 1, characterized in that: The flow regulator (4) has a five-layer hole structure.

7. The burner air duct turbulence improvement device according to claim 1, characterized in that: Mounting seats are provided at both ends of the air duct outer tube (21).

8. The burner air duct turbulence improvement device according to claim 1, characterized in that: The flow collecting mechanism (2) is welded to the inner wall of the burner air duct through the air duct outer tube (21), and the flow regulator (4) is welded to the inner wall of the burner air duct.

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