Air volume measuring device for increasing steam temperature of coal-fired power generation unit

Abstract

The invention relates to the technical field of air volume measuring devices, in particular to an air volume measuring device for increasing the steam temperature of a coal-fired power generation unit. Comprising an air inducing pipe and an air outlet pipe, the air inducing pipe and the air outlet pipe are each provided with a corrugated telescopic section, the air inducing pipe is provided with a filter plate and a first electric heating flow equalizing plate, the air outlet pipe is provided with a second electric heating flow equalizing plate, and a measuring pipe is communicated between the air inducing pipe and the air outlet pipe; the air outlet pipe is provided with a transmission system for driving the measuring pipe to reciprocate along the axis direction of the air inducing pipe, the transmission system is in transmission connection with a rotating reversing frame and a forward rotating shaft, the reversing frame is rotatably arranged in the measuring pipe, the reversing frame is rotatably provided with a second square shaft driven by the forward rotating shaft, and the reversing frame is provided with a reciprocating driving mechanism. The stepped electric heating air uniformizing system has the beneficial effects that the stepped electric heating air uniformizing system is designed for solving the problems of eddy current, bias current and flow velocity difference caused by an air inlet pipeline elbow and a valve.

Description

Technical Field

[0001] This invention relates to the field of air volume measurement device technology, specifically to an air volume measurement device for increasing steam temperature in coal-fired power generation units. Background Technology

[0002] During the operation of coal-fired power generating units, the accurate measurement and control of intake air volume plays a crucial role in boiler combustion efficiency, steam temperature control, and pollutant emission optimization. However, existing air volume measurement devices still face many technical bottlenecks in high-dust, high-temperature, and complex flow field environments. The specific problems are as follows: Traditional airflow measurement devices typically install single-point or fixed multi-point measurement probes directly inside the main duct. They are not optimized for the complex flow field characteristics of the air intake system of coal-fired power generation units. It is inconvenient to change the measurement position cyclically during measurement. On the other hand, when existing measurement devices are installed, the air intake duct has structures such as bends, valves, and diameter changes, which can easily cause vortices, flow deviations, or uneven velocity gradient distributions. This can result in flow velocity differences of up to ±20% or more at different measurement points. Traditional fixed probes can only collect local flow velocities and cannot reflect the true average airflow. Although some devices are equipped with flow equalization plates or heating elements, the flow equalization plates have a single aperture and unreasonable spacing, which cannot effectively weaken vortices. At the same time, for coal-fired power generation units, coal dust deposits on the surface of the flow equalization plate, which can change the cross-sectional shape of the flow channel, causing abnormal increases or decreases in local flow velocities. Traditional measurement devices do not have self-cleaning functions. After 3 months of operation, the ash accumulation thickness can reach 1-2 mm, which reduces the measurement accuracy of the device. Based on this, the present invention provides an air volume measuring device for increasing steam temperature in coal-fired power generating units to solve the problems mentioned in the background art. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing an air volume measurement device for increasing steam temperature in coal-fired power generating units. This solves the problem that traditional air volume measurement devices typically install single-point or fixed multi-point measurement probes directly in the main pipeline, without optimizing for the complex flow field characteristics of the air intake system of coal-fired power generating units.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A wind volume measuring device for improving steam temperature in a coal-fired power generation unit includes an induced draft pipe and an induced draft pipe. Both the induced draft pipe and the induced draft pipe are provided with corrugated expansion sections. A filter plate and a first electric heating flow equalization plate are respectively installed on the induced draft pipe. A second electric heating flow equalization plate is installed on the induced draft pipe. A measuring tube is connected between the induced draft pipe and the induced draft pipe. A transmission system is installed on the induced draft pipe to drive the measuring tube to reciprocate along the axis of the induced draft pipe. A rotating slewing frame and a rotary shaft are connected to the transmission system. The slewing frame is rotatably installed inside the measuring tube. A second square shaft driven by the rotary shaft is rotatably installed on the slewing frame. A reciprocating drive mechanism is installed on the slewing frame. Two symmetrically arranged slides that reciprocate on the slewing frame are connected to the reciprocating drive mechanism. Each slide is provided with a measuring system. The measurement system includes an impeller cylinder slidably connected to a slide block, an impeller-type wind speed sensor installed inside the impeller cylinder, a return spring installed between the impeller cylinder and the slide block, a rack plate installed on the impeller cylinder, and a vibrating wheel driven by a second square shaft rotatably installed on the slide block. The vibrating wheel is alternately provided with two dust removal toothed sections and two toothless empty sections. The central angles of the two dust removal toothed sections are different, and the transmission strokes of the two dust removal toothed sections to the rack plate are different.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] As a preferred embodiment of the present invention, the transmission system includes a servo motor mounted on the air outlet duct, a first square shaft mounted on the output shaft of the servo motor, a half-tooth gear mounted on the first square shaft, a reciprocating screw rotatably connected between the air inlet duct and the air outlet duct, a torsion spring provided at the rotatable connection between the reciprocating screw and the air outlet duct, a first reciprocating gear mounted on the reciprocating screw, the half-tooth gear periodically meshing with the first reciprocating gear as the first square shaft rotates, the reciprocating screw being drivenly connected to a measuring tube, a first set of shafts rotatably connected to the measuring tube and linked to the first square shaft, two synchronous toothed belts being drivenly connected to the first set of shafts, the two synchronous toothed belts being drivenly connected to the rotary frame and the forward rotating shaft respectively.

[0007] As a preferred technical solution of the present invention, the first set of shafts has a first square hole that is slidably connected to the first square shaft. The cross-sections of the first square hole and the first square shaft are both regular hexagons, and the radius of the half gear is 6 to 8 times the radius of the first reciprocating gear.

[0008] As a preferred embodiment of the present invention, the reciprocating drive mechanism includes a counter-rotating shaft, which is rotatably connected to the forward rotating shaft via a bearing. The forward rotating shaft and the counter-rotating shaft rotate coaxially and in opposite directions. A bidirectional lead screw and an upper gear shaft are rotatably mounted on the rotary frame. A first bevel gear is mounted on both the upper gear shaft and the bidirectional lead screw. The two first bevel gears mesh orthogonally. Incomplete gears are mounted on both the forward rotating shaft and the counter-rotating shaft. Two second reciprocating gears are mounted on the upper gear shaft. The two incomplete gears mesh with their corresponding second reciprocating gears. A left threaded section and a right threaded section are symmetrically arranged on the bidirectional lead screw. The left threaded section and the right threaded section are respectively connected to two slide blocks. Both slide blocks are slidably connected to the rotary frame. The axes of the bidirectional lead screw and the second square shaft are both perpendicular to the rotation axis of the rotary frame.

[0009] As a preferred embodiment of the present invention, the center angles corresponding to the effective meshing segments on the two incomplete gears are both 90°, the phase difference between the effective meshing segments on the two incomplete gears is 180°, and the radius of the incomplete gear is 9 to 12 times the radius of the second reciprocating gear.

[0010] As a preferred technical solution of the present invention, a synchronous shaft is rotatably mounted on the slewing frame, a synchronous bevel gear is mounted on the synchronous shaft, and a second bevel gear is mounted on both the counter-rotating shaft and the forward rotating shaft. Both second bevel gears are connected to the synchronous bevel gears for transmission, and the two second bevel gears are symmetrically arranged about the plane containing the axis of the synchronous shaft.

[0011] As a preferred technical solution of the present invention, a second gear shaft is rotatably mounted on the rotary frame, and a linkage gear is mounted on both the positive rotating shaft and the second gear shaft. The two linkage gears mesh with each other. A third bevel gear is mounted on both the second gear shaft and the second square shaft. The two third bevel gears mesh orthogonally. A second set of shafts is rotatably connected to the slide block. A second square hole is opened inside the second set of shafts and is slidably connected to the second square shaft. The cross-sections of the second square hole and the second square shaft are both regular hexagonal. A fourth bevel gear is mounted on both the second set of shafts and the vibrating wheel. The two fourth bevel gears mesh orthogonally.

[0012] As a preferred technical solution of the present invention, the impeller cylinder is a hollow cylindrical structure with openings at both ends, the radius of the impeller cylinder is 0.1 to 0.2 times the radius of the exhaust pipe, and the exhaust pipe and the exhaust pipe have the same inner diameter.

[0013] As a preferred technical solution of the present invention, both the first and second electric heating flow equalization plates are provided with flow equalization holes, the axis of the flow equalization holes is parallel to the axis of the air duct, the radius of the flow equalization holes on the first electric heating flow equalization plate is 1.5 to 2 times the radius of the flow equalization holes on the second electric heating flow equalization plate, both the first and second electric heating flow equalization plates are equipped with heating wires, and both the first and second electric heating flow equalization plates are made of nickel-chromium alloy.

[0014] As a preferred technical solution of the present invention, the inner wall of the slide has two symmetrically arranged guide grooves, and a transmission guide bar that is slidably connected to the guide groove is installed on the impeller cylinder at the position corresponding to each guide groove. The axis of the vibrating wheel is perpendicular to the axis of the impeller cylinder.

[0015] The beneficial effects of this invention are: 1. To address the issues of eddies, flow deviations, and velocity differences caused by bends and valves in the air inlet duct, this application designs a stepped electrothermal air equalization system. The first electrothermal flow equalization plate in the exhaust duct and the second electrothermal flow equalization plate in the outlet duct adopt a porous structure. Through the step effect of initial flow equalization with large-diameter orifices and refinement of the flow field with small-diameter orifices, eddies can be effectively weakened. At the same time, the built-in heating wire enables simultaneous heating and flow equalization, avoiding the temperature unevenness and flow field disorder caused by the independent design of traditional heating elements and flow equalization structures. The transmission system achieves multi-dimensional movements through the linkage of a single servo motor, including the reciprocating movement of the measuring tube along the axis, the 360° rotation of the rotary frame, and the radial symmetrical movement of the slide. The axial reciprocating movement of the measuring tube covers different cross sections of the duct along the axis, the rotation of the rotary frame achieves full circumferential coverage, and the radial movement of the slide adapts to the radial velocity gradient of the duct. The three work together to enable the measurement system to collect velocity data from multiple effective measuring points across the entire cross section, solving the limitations of local acquisition by traditional single-point or fixed multi-point probes and reducing the error in air volume measurement.

[0016] 2. In this invention, the dust removal tooth segments on the vibrating wheel with different center angles of 30° and 50° alternately mesh with the rack plate, and together with the return spring, they form a variable frequency and variable amplitude composite vibration, which can specifically disrupt the adhesion balance between dust and impeller blades. The dust accumulation rate is reduced compared with the traditional single amplitude vibration. By reducing the dust accumulation rate, the measurement accuracy of the measuring mechanism is effectively maintained. Attached Figure Description

[0017] Figure 1 A schematic diagram of an airflow measurement device for increasing steam temperature in a coal-fired power generation unit; Figure 2 This is a schematic diagram of the air outlet duct structure; Figure 3 for Figure 2 A magnified schematic diagram of the partial structure at point A in the middle; Figure 4 A schematic diagram of the slewing frame and the first set of shafts; Figure 5 A schematic diagram of the impeller cylinder and rotating frame; Figure 6 for Figure 5 A magnified schematic diagram of the local structure at point B; Figure 7 This is a schematic diagram of the upper gear shaft and the synchronous shaft. Figure 8 A schematic diagram of the impeller-type wind speed sensor and the toothless air section; Figure 9 This is a schematic diagram of the dust removal tooth section and the toothed plate.

[0018] The components represented by each number in the attached diagram are listed below: 1. Exhaust duct; 2. Outlet duct; 3. Corrugated expansion joint; 4. Filter plate; 5. First electric heating flow equalization plate; 6. Second electric heating flow equalization plate; 7. Measuring tube; 8. Rotary frame; 9. Rotary shaft; 10. Second square shaft; 11. Slide; 12. Impeller cylinder; 13. Rebound spring; 14. Impeller-type anemometer; 15. Rack plate; 16. Vibrating wheel; 17. Dust collection toothed section; 18. Servo motor; 19. First square shaft; 20. Half-tooth gear; 21. Reciprocating lead screw; 22. Torsion spring; 23. First reciprocating gear; 24. First set of shafts; 25. Reverse shaft; 26. Bidirectional lead screw; 27. Upper gear shaft; 28. Incomplete gear; 29. ​​Second reciprocating gear; 30. Synchronous shaft; 31. Second gear shaft; 32. Linkage gear; 33. Second set of shafts; 34. Flow equalization hole; 35. Toothless empty section. Detailed Implementation

[0019] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0020] The present invention provides the following preferred embodiments. like Figure 1-9 As shown, an air volume measuring device for increasing steam temperature in a coal-fired power generation unit includes an induced draft pipe 1 and an outlet pipe 2. Both the induced draft pipe 1 and the outlet pipe 2 are provided with a set of flange holes. The induced draft pipe 1 is connected to the inlet air pre-filtration equipment of the coal-fired power generation unit, and the outlet pipe 2 is connected to the inlet air pipeline of the coal-fired power generation unit. Both the air intake pipe 1 and the air outlet pipe 2 are equipped with corrugated expansion sections 3. The air intake pipe 1 is equipped with a filter plate 4 and a first electric heating flow equalization plate 5, and the air outlet pipe 2 is equipped with a second electric heating flow equalization plate 6. A measuring tube 7 connects the air intake pipe 1 and the air outlet pipe 2. Both the first electric heating flow equalization plate 5 and the second electric heating flow equalization plate 6 are provided with flow equalization holes 34, and the axis of the flow equalization holes 34 is parallel to the axis of the air duct 1. In a preferred embodiment, the radius of the flow equalization hole 34 on the first electric heating flow equalization plate 5 is 1.8 times the radius of the flow equalization hole 34 on the second electric heating flow equalization plate 6; The distance between the first electric heating flow equalization plate 5 and the second electric heating flow equalization plate 6 is 2.5 times the inner diameter of the air duct 1; Both the first electric heating equalization plate 5 and the second electric heating equalization plate 6 have built-in heating wires, and both the first electric heating equalization plate 5 and the second electric heating equalization plate 6 are nickel-chromium alloys. After the airflow enters through the exhaust pipe 1, it first passes through the filter plate 4 to filter coal dust and impurities, and then flows through the first electric heating flow equalization plate 5. Its larger radius flow equalization holes 34 can perform preliminary flow equalization on the airflow, weakening the eddies and flow deviations caused by pipe bends, valves and other components. At the same time, the built-in electric heating wire preheats the airflow for the first time. Then the airflow enters the measuring pipe 7 to complete the air volume detection, and then passes through the second electric heating flow equalization plate 6. The smaller radius flow equalization holes 34 further refine the flow field and achieve secondary flow equalization. Combined with secondary heating, the airflow temperature and velocity distribution are more uniform. The design of a flow equalization orifice radius ratio of 1.8 times and a spacing of 2.5 times the inner diameter creates a synergistic effect of stepped flow equalization and heating, which not only avoids airflow loss caused by single strong flow equalization, but also improves heat exchange efficiency. The nickel-chromium alloy material combines high temperature resistance and corrosion resistance, and can resist the erosion of coal dust. It solves the problems of easy ash accumulation, poor flow uniformity and low compatibility with measurement systems in traditional heating devices, and provides a stable flow field basis for subsequent high-precision air volume measurement. At the same time, it enables controllable improvement of inlet air temperature.

[0021] The air outlet duct 2 is equipped with a transmission system that drives the measuring tube 7 to reciprocate along the axis of the air duct 1. The transmission system is connected to a rotating frame 8 and a rotating shaft 9. The rotating frame 8 is rotatably installed inside the measuring tube 7. The transmission system includes a servo motor 18 mounted on the air outlet duct 2. A first square shaft 19 is mounted on the output shaft end of the servo motor 18. A half-tooth gear 20 is mounted on the first square shaft 19. A reciprocating screw 21 is rotatably connected between the air inlet duct 1 and the air outlet duct 2. A torsion spring 22 is provided at the rotatable connection between the reciprocating screw 21 and the air outlet duct 2. A first reciprocating gear 23 is installed on the reciprocating screw 21. The half-tooth gear 20 rotates with the first square shaft 19 and periodically meshes with the first reciprocating gear 23. The reciprocating screw 21 is connected to the measuring tube 7. A first set of shafts 24 that is linked with the first square shaft 19 is rotatably connected to the measuring tube 7. Two synchronous toothed belts are connected to the first set of shafts 24. The two synchronous toothed belts are respectively connected to the rotary frame 8 and the positive rotating shaft 9. The first set of shafts 24 has a first square hole that is slidably connected to the first square shaft 19. The cross-sections of the first square hole and the first square shaft 19 are both regular hexagons. In a preferred embodiment, the radius of the half-tooth gear 20 is 7 times the radius of the first reciprocating gear 23; The device structure can be greatly simplified by using a single servo motor 18 to achieve multi-action coordination of axial reciprocating movement of measuring tube 7, rotation of rotary frame 8, and rotation of positive rotation shaft 9. When the servo motor 18 drives the first square shaft 19 to rotate, the half gear 20 periodically meshes with the first reciprocating gear 23. Combined with the reset action of the torsion spring 22, the reciprocating screw 21 achieves a cyclical motion of meshing forward rotation and torsion spring 22 reversing, driving the measuring tube 7 to slowly reciprocate along the axis. At the same time, the first square shaft 19 drives the first set of shafts 24 to rotate through the first square hole of the regular hexagon, ensuring that when the measuring tube 7 moves axially, the power can still be stably transmitted to the rotary frame 8 and the positive rotation shaft 9 through the synchronous toothed belt, so as to achieve uninterrupted rotational power during axial movement. A second square shaft 10, driven by a positive rotation shaft 9, is rotatably mounted on the rotary frame 8. A second gear shaft 31 is rotatably mounted on the rotary frame 8. Both the rotary shaft 9 and the second gear shaft 31 are equipped with linkage gears 32, and the two linkage gears 32 mesh with each other. A third bevel gear is installed on both the second gear shaft 31 and the second square shaft 10, and the two third bevel gears mesh orthogonally. The rotational power of the positive rotating shaft 9 is transmitted to the second gear shaft 31 through the meshing linkage gear 32, and then through two orthogonal third bevel gears to realize the spatial direction of the horizontal rotational power to the vertical rotational power, driving the second square shaft 10 to rotate continuously. The meshing transmission of the linkage gear 32 ensures the stability of the power transmission ratio; A reciprocating drive mechanism is installed on the rotary frame 8, and the reciprocating drive mechanism is connected to two symmetrically arranged slides 11 that reciprocate on the rotary frame 8. The reciprocating drive mechanism includes a counter-rotating shaft 25, which is rotatably connected to the forward rotating shaft 9 via a bearing. The forward rotating shaft 9 and the counter-rotating shaft 25 rotate in opposite directions on the same axis. A synchronous shaft 30 is rotatably mounted on the slewing frame 8. A synchronous bevel gear is mounted on the synchronous shaft 30. A second bevel gear is mounted on both the counter-rotating shaft 25 and the forward rotating shaft 9. Both second bevel gears are connected to the synchronous bevel gears for transmission. The two second bevel gears are symmetrically arranged about the plane containing the axis of the synchronous shaft 30. A double-acting lead screw 26 and an upper gear shaft 27 are rotatably mounted on the slewing frame 8. Both the upper gear shaft 27 and the double-acting lead screw 26 are equipped with first bevel gears, and the two first bevel gears mesh orthogonally. Incomplete gears 28 are installed on both the forward rotating shaft 9 and the reverse rotating shaft 25. Two second reciprocating gears 29 are installed on the upper gear shaft 27. The two incomplete gears 28 mesh with the corresponding second reciprocating gears 29 respectively. The center angles corresponding to the effective meshing segments on the two incomplete gears 28 are both 90°, and the phase difference between the effective meshing segments on the two incomplete gears 28 is 180°. In a preferred embodiment, the radius of the incomplete gear 28 is 10 times the radius of the second reciprocating gear 29; The double-ended lead screw 26 is symmetrically provided with a left thread section and a right thread section. The left thread section and the right thread section are respectively connected to two slide blocks 11 for transmission. Both slide blocks 11 are slidably connected to the rotary frame 8. The axes of the double-ended lead screw 26 and the second square shaft 10 are perpendicular to the rotation axis of the rotary frame 8. The reciprocating drive mechanism achieves symmetrical radial synchronous adjustment of the two slide blocks 11; The forward rotating shaft 9 drives the reverse rotating shaft 25 to achieve coaxial reverse rotation through the synchronous bevel gear and the symmetrically arranged second bevel gear. The two incomplete gears 28 mesh with the corresponding second reciprocating gears 29 respectively, causing the upper gear shaft 27 to produce intermittent rotation of forward rotation, stop, reverse rotation, and stop. Then, the first bevel gear drives the bidirectional lead screw 26 to rotate forward and reverse, and finally drives the two slide blocks 11 to move symmetrically back and forth along the left thread section and the right thread section. The 90° effective engagement segment and the 180° phase difference ensure that the two slide blocks 11 move in complete synchronization and opposite directions, and avoid motion interference when the two incomplete gears 28 are running. Each slide 11 is equipped with a measuring system; The measuring system includes an impeller cylinder 12 that is slidably connected to the slide block 11; The inner wall of the slide 11 has two symmetrically arranged guide grooves, and the impeller cylinder 12 is equipped with a transmission guide bar that is slidably connected to the guide groove at the position corresponding to each guide groove. The impeller cylinder 12 is a hollow cylindrical structure with openings at both ends, and the inner diameters of the air inlet pipe 1 and the air outlet pipe 2 are the same. In a preferred embodiment, the radius of the impeller cylinder 12 is 0.15 times the radius of the exhaust pipe 1; An impeller-type wind speed sensor 14 is installed inside the impeller cylinder 12. A return spring 13 is installed between the impeller cylinder 12 and the slide 11. A rack plate 15 is installed on the impeller cylinder 12. A vibrating wheel 16 driven by a second square shaft 10 is rotatably installed on the slide 11. The axis of the vibrating wheel 16 is perpendicular to the axis of the impeller cylinder 12. The preferred model of the impeller-type wind speed sensor 14 is DF-YLF; A second set of shafts 33 is rotatably connected to the slide block 11. The interior of the second set of shafts 33 is provided with a second square hole that is slidably connected to the second square shaft 10. The cross-sections of the second square hole and the second square shaft 10 are both regular hexagonal. A fourth bevel gear is installed on both the second set of shafts 33 and the vibrating wheel 16. The two fourth bevel gears mesh orthogonally. The measurement system balances the stability of airflow measurement with the dust prevention requirements of the impeller. The guide groove on the inner wall of the slide block 11 cooperates with the transmission guide bar of the impeller cylinder 12 to restrict the movement trajectory of the impeller cylinder 12, ensuring that it always slides along the axial direction and avoiding impeller speed measurement error caused by skewness. The impeller cylinder 12 design with a radius of 0.15 times that of the exhaust duct 1 ensures the capture of representative flow velocities while keeping the flow field interference rate within the set value, thus solving the problem of airflow disturbance caused by traditional large-size measurement components. The hexagonal square hole design of the second set of shafts 33 enables the second square shaft 10 to stably transmit power to the fourth bevel gear and drive the vibrating wheel 16 to rotate when it moves radially with the slide 11. The reverberation spring 13 and the vibrating wheel 16 mesh to form a composite vibration of active drive and elastic reset, which enhances the vibration effect of the impeller cylinder 12 and prevents dust from depositing on the impeller surface. The overall structure realizes the integration of measurement, dust prevention and power transmission, and is suitable for long-term stable operation under high dust conditions of coal combustion. The vibrating wheel 16 is alternately provided with two dust removal toothed sections 17 and two toothless empty sections 35. The central angles of the two dust removal toothed sections 17 are different and the transmission strokes of the two dust removal toothed sections 17 to the rack plate 15 are different.

[0022] In a preferred embodiment, the central angles of the two dust removal toothed sections 17 are 30° and 50°, respectively, and the central angles of the two toothless empty sections 35 are both 140°.

[0023] When the vibrating wheel 16 rotates, the dust removal tooth segments 17 with two different center angles of 30° and 50° alternately mesh with the rack plate 15, driving the impeller cylinder 12 to produce alternating short-stroke and long-stroke reciprocating sliding. Combined with the elastic force of the return spring 13, the impeller cylinder 12 forms a composite vibration with variable frequency and variable amplitude. The 140° toothless section 35 provides a reset buffer time for the impeller cylinder 12, avoiding excessive vibration caused by continuous meshing that could interfere with the impeller speed. Vibrations with different strokes can act on different areas of the impeller blades, disrupting the adhesion balance between dust and blades, thus reducing the dust accumulation rate compared to traditional single-amplitude vibration. The above structural design resolves the contradiction of measurement distortion caused by continuous vibration, achieving a dual guarantee of dust prevention and measurement accuracy.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A kind of air volume measuring device for improving steam temperature of coal-fired power generating unit, including air duct (1) and air outlet pipe (2), it is characterized in that, The corrugated expansion section (3) is arranged on the air inlet pipe (1) and the air outlet pipe (2), the filter plate (4) and the first electric heating current uniform plate (5) are respectively arranged on the air inlet pipe (1), the second electric heating current uniform plate (6) is arranged on the air outlet pipe (2), the measuring pipe (7) is communicated between the air inlet pipe (1) and the air outlet pipe (2), the transmission system for driving the measuring pipe (7) to reciprocate along the axis direction of the air inlet pipe (1) is arranged on the air outlet pipe (2), the rotating rotary frame (8) and the positive rotation shaft (9) are drivingly connected on the transmission system, the rotary frame (8) is rotatably arranged in the measuring pipe (7), the second square shaft (10) driven by the positive rotation shaft (9) is rotatably arranged on the rotary frame (8), the reciprocating driving mechanism is arranged on the rotary frame (8), the two symmetrical slide seats (11) reciprocatingly moving on the rotary frame (8) are drivingly connected on the reciprocating driving mechanism, and the measuring system is arranged on each slide seat (11). The measuring system comprises the impeller cylinder (12) slidingly connected on the slide seat (11), the impeller type wind speed sensor (14) is arranged in the impeller cylinder (12), the back vibration spring (13) is arranged between the impeller cylinder (12) and the slide seat (11), the rack plate (15) is arranged on the impeller cylinder (12), the vibration wheel (16) driven by the second square shaft (10) is rotatably arranged on the slide seat (11), the two dust removal tooth sections (17) and the two toothless empty sections (35) are alternately arranged on the vibration wheel (16), the central angles of the two dust removal tooth sections (17) are different, and the transmission stroke of the two dust removal tooth sections (17) on the rack plate (15) is different.

2. The air flow measuring device for raising the steam temperature of a coal-fired power generating unit according to claim 1, characterized in that, The transmission system comprises the servo motor (18) arranged on the air outlet pipe (2), the first square shaft (19) is arranged on the output shaft end of the servo motor (18), the half-tooth gear (20) is arranged on the first square shaft (19), the reciprocating screw rod (21) is rotatably connected between the air inlet pipe (1) and the air outlet pipe (2), the torsional spring (22) is arranged at the rotary connection position of the reciprocating screw rod (21) and the air outlet pipe (2), the first reciprocating gear (23) is arranged on the reciprocating screw rod (21), the half-tooth gear (20) is periodically meshed with the first reciprocating gear (23) when the first square shaft (19) rotates, the reciprocating screw rod (21) is drivingly connected with the measuring pipe (7), the first sleeve shaft (24) drivingly connected with the first square shaft (19) is rotatably arranged on the measuring pipe (7), the two synchronous tooth belts are drivingly connected with the rotary frame (8) and the positive rotation shaft (9).

3. The draft measurement device for raising the steam temperature of a coal-fired power generating unit according to claim 2, characterized by The first square hole is arranged in the first sleeve shaft (24), the first square hole and the first square shaft (19) are slidingly connected, the cross sections of the first square hole and the first square shaft (19) are regular hexagons, and the radius of the half-tooth gear (20) is 6-8 times the radius of the first reciprocating gear (23).

4. The air flow measuring device for raising the steam temperature of a coal-fired power generating unit according to claim 1, characterized in that, The reciprocating drive mechanism comprises a counter-rotating shaft (25) which is rotationally connected with the positive-rotating shaft (9) through a bearing, the positive-rotating shaft (9) rotates reversely with the counter-rotating shaft (25), a bidirectional screw rod (26) and an upper tooth shaft (27) are rotationally installed on the rotary frame (8), the upper tooth shaft (27) and the bidirectional screw rod (26) are both provided with a first bevel gear, the two first bevel gears are orthogonal meshing, the positive-rotating shaft (9) and the counter-rotating shaft (25) are both provided with an incomplete gear (28), two second reciprocating gears (29) are installed on the upper tooth shaft (27), the two incomplete gears (28) are respectively meshed with the corresponding second reciprocating gears (29), the bidirectional screw rod (26) is provided with a left threaded section and a right threaded section which are symmetrically arranged, the left threaded section and the right threaded section are respectively drivingly connected with two sliding seats (11), the two sliding seats (11) are both slidingly connected with the rotary frame (8), the axis of the bidirectional screw rod (26) and the second square shaft (10) are both perpendicular to the rotation axis of the rotary frame (8).

5. The draft measurement device for raising the steam temperature of a coal-fired power generating unit according to claim 4, characterized by The central angle of the effective meshing section of the two incomplete gears (28) is both 90°, the phase difference of the effective meshing sections of the two incomplete gears (28) is 180°, and the radius of the incomplete gear (28) is 9-12 times of the radius of the second reciprocating gear (29).

6. The draft measurement device for raising the steam temperature of a coal-fired power generating unit according to claim 4, characterized by A synchronous shaft (30) is rotationally installed on the rotary frame (8), the synchronous shaft (30) is provided with a synchronous bevel gear, the counter-rotating shaft (25) and the positive-rotating shaft (9) are both provided with a second bevel gear, the two second bevel gears are both drivingly connected with the synchronous bevel gear, and the two second bevel gears are symmetrically arranged with the plane where the axis of the synchronous shaft (30) is located as the axis.

7. The draft measurement device for increasing the steam temperature of a coal-fired power generating unit according to claim 1, characterized by, A second tooth shaft (31) is rotationally installed on the rotary frame (8), the positive-rotating shaft (9) and the second tooth shaft (31) are both provided with a linkage gear (32), the two linkage gears (32) are meshing with each other, the second tooth shaft (31) and the second square shaft (10) are both provided with a third bevel gear, the two third bevel gears are orthogonal meshing, a second sleeve shaft (33) is rotationally connected with the sliding seat (11), the second sleeve shaft (33) is internally provided with a second square hole which is slidingly connected with the second square shaft (10), the second square hole and the second square shaft (10) are both hexagonal in cross section, the second sleeve shaft (33) and the vibration wheel (16) are both provided with a fourth bevel gear, and the two fourth bevel gears are orthogonal meshing.

8. The draft measurement device for increasing the steam temperature of a coal-fired power generating unit according to claim 1, characterized by, The impeller cylinder (12) is a hollow cylinder structure with two open ends, the radius of the impeller cylinder (12) is 0.1-0.2 times of the radius of the air duct (1), and the inner diameters of the air duct (1) and the air outlet pipe (2) are the same.

9. The draft measurement device for increasing the steam temperature of a coal-fired power generating unit according to claim 1, characterized by, The first electric heat flow equalizing plate (5) and the second electric heat flow equalizing plate (6) are provided with flow equalizing holes (34), the axis of the flow equalizing holes (34) is parallel to the axis of the air duct (1), the radius of the flow equalizing holes (34) on the first electric heat flow equalizing plate (5) is 1.5-2 times the radius of the flow equalizing holes (34) on the second electric heat flow equalizing plate (6), the first electric heat flow equalizing plate (5) and the second electric heat flow equalizing plate (6) are internally provided with electric heating wires, and the first electric heat flow equalizing plate (5) and the second electric heat flow equalizing plate (6) are made of nickel-chromium alloy.

10. The draft measurement device for increasing the steam temperature of a coal-fired power generating unit according to claim 1, characterized by, The inner wall of the sliding seat (11) is provided with two symmetrically arranged guide grooves, the impeller cylinder (12) is provided with a transmission guide bar which is in sliding connection with the guide groove and is installed at a position corresponding to each guide groove, and the axis of the vibration wheel (16) is perpendicular to the axis of the impeller cylinder (12).

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