Aperture type air volume adjusting device of air cooling fan

Abstract

The aperture type air volume adjusting device is arranged at an air opening of an air duct of the air cooling fan and comprises an air volume adjusting mechanism and a driving mechanism, and the air volume adjusting mechanism comprises a control wheel disc rotationally arranged at the air opening and a plurality of adjusting units arranged on one side face of the control wheel disc; the diameter of the inner ring of the control wheel disc is equal to that of the air duct air opening, the control wheel disc and the air duct are coaxially arranged, the control wheel disc rotates with the central axis of the air duct as the rotating axis, and the driving mechanism drives the control wheel disc to rotate. The adjusting unit comprises adjusting blades rotationally arranged on the side face of the control wheel disc and a driving part used for controlling the adjusting blades to rotate, and the adjusting blades rotate with the vertical axis parallel to the central axis of the air duct as the rotating axis; the arc-shaped connecting lines of the side faces, away from the rotating end and the rotating end, of the adjusting blades form a throttling round hole, the radius of the inner ring of the control wheel disc is set to be R, and the radius of the throttling round hole is 0-R. The air duct has the effect of conveniently adjusting the air volume at the air outlet of the air duct.

Description

Technical Field

[0001] The invention relates to the technical field of direct air cooling systems of power plants, and in particular to an aperture-type air volume regulating device for an air cooling fan. Background Art

[0002] Air-cooled island is the abbreviation of large air-cooled heat exchanger. Its principle is to use natural air to cool the process fluid. It is a large-scale industrial heat exchange equipment. Compared with water cooling, it has the advantages of sufficient cold source, saving cooling water, and reducing environmental pollution. Due to water shortage in northern my country, a large number of air-cooled steam turbine exhaust air-cooled power plants have been built, including direct air cooling systems and indirect air cooling systems.

[0003] Direct air cooling system refers to a cooling system in which the exhaust steam of the steam turbine directly transfers heat to the air as the cooling medium in the condenser without passing through any other intermediate links. The direct air cooling system needs to be equipped with a large-flow axial flow fan to provide cooling air for the air cooling system. The cooling device of a general large-scale direct air cooling system is arranged on a platform at a higher altitude. According to the unit capacity, the number of fans of the air cooling system supporting the 300MW steam turbine reaches 30, and the number of fans supporting the 660MW steam turbine reaches 64. The air cooling fans are distributed in a matrix according to the structure of the radiator equipment. The diameter of each fan is at least 9 meters. The outer side of the fan blades is covered with a wind tube, and the air inlet of the wind tube is provided with a fan collector in the shape of a flared trumpet to reduce the flow resistance at the wind tube inlet.

[0004] In spring and autumn when the temperature is higher, the air-cooling fan relies on the inverter to adjust the fan speed to achieve air volume regulation; however, in the cold winter, the temperature in the north is low. Even if the fan blades stop rotating, the natural ventilation volume formed by the heat of the air-cooling radiator may cause the air-cooling radiator to freeze and cause damage to the radiator.

[0005] At present, the solution to this problem is to install an automatically opening and closing wind curtain windshield device at the fan outlet, or a windshield device with openable and closable blinds. However, the aforementioned windshield device only has the windshield function of fully closing and fully opening, and cannot achieve continuous air volume adjustment. In addition, in a low temperature environment, it cannot accurately adjust the air flow according to the temperature through continuous full-open and full-close cycle operation, has a poor anti-freeze effect, and consumes energy. Summary of the invention

[0006] The object of the present invention is to provide an air volume regulating device for an air cooling fan, which is convenient for regulating the air flow at the air outlet of the air cooling fan.

[0007] In order to achieve the purpose of the present invention, the present invention provides an aperture-type air volume adjustment device for an air-cooling fan, which is arranged at the air outlet of the air duct of the air-cooling fan, and includes an air volume adjustment mechanism and a driving mechanism, wherein the air volume adjustment mechanism includes a control wheel rotatably arranged at the air outlet and a plurality of adjustment units arranged on a surface of one side of the control wheel, wherein the diameter of the inner ring of the control wheel is equal to the diameter of the air outlet of the air duct, the diameter of the outer ring of the control wheel is greater than the diameter of the air outlet of the air duct, the control wheel is coaxially arranged with the air duct, the control wheel rotates with the central axis of the air duct as the rotation axis, and the driving mechanism is used to drive the control wheel to rotate clockwise and counterclockwise; The regulating unit comprises a regulating blade rotatably arranged on the control wheel and a driving member for controlling the rotation of the regulating blade, wherein the regulating blade rotates with a vertical axis parallel to the central axis of the wind tube as a rotation axis, and two adjacent regulating blades are arranged in an upper and lower stack; A throttling circular hole is formed by an arc-shaped line connecting a plurality of adjusting blades away from one rotating end and one side of the rotating end. Assuming that the radius of the inner ring of the control wheel is R, the radius of the throttling circular hole is 0~R, and the length of the adjusting blade is greater than R. When the radius of the throttling circular hole is 0, a plurality of adjusting blades are combined to shield the inner ring opening of the control wheel, and the control wheel combination of a plurality of adjusting blades shield the air outlet.

[0008] As a preferred technical solution of the present invention, both sides of the adjusting blade in the length direction are set as arc surfaces. When the radius of the throttling hole is R, the arc surface on one side of the adjusting blade close to the inner ring of the control wheel coincides with the edge of the inner ring of the control wheel.

[0009] As a preferred technical solution of the present invention, a plurality of drive grooves are provided on one side surface of the control wheel, and the plurality of drive grooves are arranged at intervals around the center of the control wheel, and an extension line of the drive groove and a tangent line of the inner ring of the control wheel are at an angle of 15 to 70 degrees; the drive member includes a drive shaft arranged on a side of the blade close to the control wheel, the number of the adjustment units is the same as the number of the drive grooves, and the drive shaft is slidably arranged in a corresponding drive groove.

[0010] As a preferred technical solution of the present invention, the driving mechanism includes a driving rack arranged on the outer ring of the control wheel, a driving motor arranged on one side of the control wheel, and a gear arranged on the output shaft of the driving motor, and the gear is meshed with the driving rack.

[0011] As a preferred technical solution of the present invention, adjacent regulating blades are always overlapped up and down.

[0012] As a preferred technical solution of the present invention, the surface of the side where the adjusting blade slides relative to the control wheel is smooth, the surface of the side where the adjusting blade slides relative to the adjacent adjusting blade is smooth, and the adjusting blade is made of stainless steel.

[0013] As a preferred technical solution of the present invention, the thickness of the regulating blade is 0.5~5mm.

[0014] As a preferred technical solution of the present invention, the width of the regulating blade gradually decreases from one rotating end to the other end.

[0015] Compared with the prior art, the present invention provides an aperture-type air volume adjustment device for an air-cooling fan, which has the following beneficial effects: The rotation combination of several adjusting blades forms a throttling hole at the inner ring opening of the control wheel. The size of the throttling hole is adjusted by driving the adjusting blades to rotate, so as to change the air volume passing through the air duct, thereby achieving the purpose of antifreeze for the cooling tube bundle, air-cooled radiator and other components of the air-cooling system, and can continuously adjust the air volume to achieve the effect of energy saving in fan operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention disposed at the air-cooled condenser; Figure 2 It is an enlarged structural schematic diagram of a single regulating blade in the present invention; Figure 3 It is a schematic diagram of the overall structure of the air volume regulating mechanism of the present invention when it is fully opened; Figure 4 It is a schematic diagram of the overall structure of the air volume regulating mechanism in the present invention when it is completely closed.

[0017] 1. Steam distribution pipe; 2. Heat dissipation tube bundle; 3. Condensate collection pipe; 4. Fan drive motor; 5. Air cooling island platform; 6. Fan blades; 7. Air duct; 8. Drive motor; 9. Air volume adjustment mechanism; 10. Air cooling island protection device; 11. Adjustment blades; 12. Fixed shaft; 13. Drive shaft; 14. Control wheel; 15. Drive slot. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 4 The embodiment of the present invention provides an aperture-type air volume regulating device for an air-cooling fan, which is arranged at the air outlet of a wind tube 7 of an air-cooling fan of an air-cooling condenser, and includes an air volume regulating mechanism and a driving mechanism.

[0020] The air-cooling island platform 5 is equipped with a steam distribution pipe 1, a heat dissipation tube bundle 2, a condensate collection pipe 3, and a fan drive motor 4. The drive shaft of the fan drive motor 4 passes downward through the air-cooling island platform 5 and is connected to a plurality of fan blades 6. The outer side of the fan blades 6 is covered with a wind tube 7, and an air-cooling island protection device 10 is arranged below the wind tube 7. When the air-cooling condenser is in operation, the steam exhausted by the steam turbine enters the steam distribution pipe 1 of the air-cooling island through the conveying pipeline, and the steam in the steam distribution pipe 1 enters the heat dissipation tube bundle 2. The steam is cooled in the heat dissipation tube bundle 2 and becomes condensed water, and the condensed water enters the condensate collection pipe 3. The air is blown into the cooling unit through the cooling fan blades 6 to cool the steam in the cooling tube bundle 2.

[0021] The air volume adjustment mechanism 9 is installed below the air outlet of the air duct 7 and above the air cooling island protection device. The air volume adjustment mechanism 9 includes a control wheel 14 rotatably arranged at the air outlet and a plurality of adjustment units arranged on the surface of one side of the control wheel 14. The control wheel 14 is annular and is coaxially arranged with the air duct 7. The control wheel 14 rotates with the central axis of the air duct 7 as the rotation axis. The diameter of the inner ring of the control wheel 14 is equal to the diameter of the air outlet of the air duct 7, and the diameter of the outer ring of the control wheel 14 is greater than the diameter of the air outlet of the air duct 7. The driving mechanism includes a driving rack (not shown in the figure) fixed to the outer ring of the control wheel 14, a driving motor 8 installed on one side of the control wheel 14, and a gear (not shown in the figure) installed on the output shaft of the driving motor 8. The gear is meshed with the driving rack. The driving motor 8 drives the counterclockwise and clockwise rotation of the control wheel 14, which can be a servo motor or the like.

[0022] A plurality of drive grooves 15 are provided on the surface of the control wheel 14 on one side away from the wind tube 7. The plurality of drive grooves 15 are arranged at intervals around the center of the control wheel 14, and the angle between the extended line of the drive groove 15 and the tangent of the inner circle of the control wheel 14 is 15 to 70 degrees, wherein the best angle is that the extended line of the drive groove 15 and the tangent of the inner circle of the control wheel 14 is 30 degrees, and the extended lines at both ends of the drive groove 15 are at the same distance from the edges of the outer and inner circles of the control wheel 14.

[0023] The adjusting unit includes an adjusting blade 11, one end of which is rotatably arranged on a corresponding fixed shaft 12, and a driving member, the driving member includes a driving shaft 13, the end of the driving shaft 13 away from the adjusting blade 11 is inserted and slidably arranged in a corresponding driving groove 15, the fixed shaft 12 and the driving shaft 13 on the same adjusting blade 11 are arranged on opposite sides of one end of the adjusting blade 11, the adjusting blade 11 rotates with a vertical axis parallel to the central axis of the wind tube 7 as the rotation axis, and two adjacent adjusting blades 11 are arranged to be stacked up and down.

[0024] A line connecting the side surfaces of the ends of a plurality of adjusting blades 11 away from one end of the fixed shaft 12 forms a closed throttling circular hole. Assuming that the radius of the inner ring of the control wheel 14 is R, the radius of the throttling circular hole is 0~R. When the radius of the throttling circular hole is 0, a combination of the plurality of adjusting blades 11 covers the inner ring opening of the control wheel 14; when the radius of the throttling circular hole is R, the adjusting blades 11 all rotate to one side of the inner ring of the control wheel 14.

[0025] In winter, in order to prevent the air-cooled radiator from freezing and being damaged, the drive motor 8 can be driven to drive the gear and the drive rack meshing with the gear to rotate, thereby driving the control wheel 14 to rotate. Figure 3 For example, when the driving control wheel 14 rotates clockwise, the regulating blade 11 gradually closes the air outlet, and the radius of the throttling hole gradually decreases. When the driving control wheel 14 rotates counterclockwise, the regulating blade 11 gradually opens the air outlet, and the radius of the throttling hole gradually increases. The driving motor 8 can control the complete closing or opening of the air outlet. It is also possible to continuously control the radius of the throttling hole according to the temperature change, and then realize continuous air volume adjustment to solve the adverse effect of excessive air flow on the cooling tube bundle of the air cooling system in the low temperature environment in winter, which is beneficial to the winter antifreeze of the air cooling equipment, and can continuously realize the adjustment of air volume to achieve the effect of energy saving in fan operation.

[0026] At the same time, the air volume at the air outlet of the air duct 7 can be flexibly adjusted according to the changes in temperature and air volume, so as to improve the operating conditions of the air-cooled condenser in the low temperature environment in winter and achieve the best operating state of the equipment.

[0027] The installation method of the control wheel 14 is not specifically limited. The number of adjustment units can be increased or decreased according to the size of the air outlet of the wind tube 7. In the embodiment of the present application, the diameter of the wind tube 7 is 9.4 meters, the outer diameter of the control wheel 14 is 11 meters, and the inner diameter is 9.5 meters. For example, the number of adjustment blades 11 is 29, and the thickness of the adjustment blades 11 is 0.5~5mm, and the optimal thickness is 1mm. The length of the drive groove 15 is 10mm from the inner edge and the outer edge of the control wheel 14. Adjacent adjustment blades 11 are always kept stacked up and down to avoid misalignment between adjacent adjustment blades 11 when fully closed or fully opened, which affects the rotation of the adjustment blades 11. The adjustment blades 11 are smooth as a whole, and the material is made of metal material. The friction between adjacent adjustment blades 11 is small, and its structural strength is guaranteed.

[0028] The radius of the air cylinder 7 is equal to the radius of the control wheel 14, and the length of the regulating blade 11 is set to L, that is, L>R. In the embodiment of the present application, L is close to 5 meters. The end of the regulating blade 11 that sets the fixed shaft 12 is set as the width end, which is set to H, H=1m, and the width H of the regulating blade 11 is gradually reduced from one end of the fixed shaft 12 to the other end. Both sides of the length direction of the regulating blade 11 are set to arc surfaces. When the radius of the throttling circular hole is R, the arc surface on one side of the regulating blade 11 close to the inner circle of the control wheel 14 coincides with the inner circle edge of the control wheel 14.

[0029] The width of the adjusting blade 11 is gradually reduced from one end of the fixed shaft 12 to the other end, and both sides in the length direction are set as arc surfaces, which can effectively reduce the horizontal resistance encountered by the adjusting blade 11 during the rotation process, and ensure that the adjacent adjusting blades 11 are always stacked up and down, while reducing the wind force area of ​​the adjusting blade 11 in the vertical direction, thereby further reducing the rotation resistance of the adjusting blade 11.

[0030] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An aperture-type air volume regulating device for an air-cooling fan, arranged at the air outlet of a wind tube (7) of the air-cooling fan, characterized in that: include: An air volume regulating mechanism (9) and a driving mechanism, wherein the air volume regulating mechanism (9) comprises a control wheel (14) rotatably arranged at the air outlet and a plurality of regulating units arranged on one side of the control wheel (14), the diameter of the inner ring of the control wheel (14) being equal to the diameter of the air outlet of the wind tube (7), the diameter of the outer ring of the control wheel (14) being greater than the diameter of the air outlet of the wind tube (7), the control wheel (14) being coaxially arranged with the wind tube (7), the control wheel (14) rotating with the central axis of the wind tube (7) as the rotation axis, and the driving mechanism being used to drive the control wheel (14) to rotate clockwise and counterclockwise; The regulating unit comprises an regulating blade (11) rotatably arranged on a control wheel (14) and a driving member for controlling the rotation of the regulating blade (11), wherein the regulating blade (11) rotates about a vertical axis parallel to the central axis of the wind tube (7) as a rotation axis, and two adjacent regulating blades (11) are arranged to overlap each other. A throttling circular hole is formed by connecting a plurality of the adjusting blades (11) away from one end of the rotation and a side arc of the rotating end. Assuming that the radius of the inner circle of the control wheel (14) is R, the radius of the throttling circular hole is 0~R, and the length of the adjusting blade (11) is greater than R. When the radius of the throttling circular hole is 0, the plurality of adjusting blades (11) are combined to shield the inner circle opening of the control wheel (14), and the control wheel (14) is combined with the plurality of adjusting blades (11) to shield the air outlet.

2. The aperture type air volume regulating device for an air cooling fan according to claim 1, characterized in that: Both sides of the regulating blade (11) in the length direction are arranged as arc surfaces, and when the radius of the throttling circular hole is R, the arc surface on one side of the regulating blade (11) close to the inner ring of the control wheel (14) coincides with the edge of the inner ring of the control wheel (14).

3. The aperture type air volume regulating device for an air cooling fan according to claim 1, characterized in that: A plurality of drive grooves (15) are formed on a surface of one side of the control wheel disc (14), the plurality of drive grooves (15) are arranged at intervals around the center of the control wheel disc (14), and an extended line of the drive groove (15) and a tangent line of the inner circle of the control wheel disc (14) form an angle of 15 to 70 degrees; The driving member comprises a driving shaft (13) arranged on a side of the blade close to the control wheel (14), the number of the adjusting units is the same as the number of the driving slots (15), and the driving shaft (13) is slidably arranged in a corresponding driving slot (15).

4. The aperture type air volume regulating device for an air cooling fan according to claim 1, characterized in that: The driving mechanism comprises a driving rack arranged on the outer ring of the control wheel (14), a driving motor (8) arranged on one side of the control wheel (14), and a gear arranged on the output shaft of the driving motor (8), wherein the gear is meshed with the driving rack.

5. The aperture type air volume regulating device for an air cooling fan according to claim 1, characterized in that: Adjacent regulating blades (11) are always kept stacked up and down.

6. The aperture type air volume regulating device for an air cooling fan according to claim 1, characterized in that: The surface of the side where the regulating blade (11) slides relative to the control wheel (14) is smooth, and the surface of the side where the regulating blade (11) slides relative to the adjacent regulating blade (11) is smooth, and the regulating blade (11) is made of metal.

7. The aperture type air volume regulating device for an air cooling fan according to claim 1, characterized in that: The thickness of the regulating blade (11) is 0.5-5 mm.

8. The aperture type air volume regulating device for an air cooling fan according to claim 1, characterized in that: The width of the regulating blade (11) gradually decreases from one rotating end to the other end.

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