Axial flow fan capable of avoiding resonance

Abstract

The utility model belongs to the technical field of axial flow fans, and relates to an axial flow fan capable of avoiding resonance, which comprises an axial flow fan support and an axial flow fan body fixedly arranged on the axial flow fan support. A first motor is fixedly mounted in the axial flow fan body through a mounting ring; an output shaft of the first motor is fixedly connected with a fan blade seat; a dustproof block is fixedly connected to the front side of the fan blade seat; a plurality of fan blades are annularly, uniformly and rotationally arranged on the outer side of the fan blade seat; a mounting rod is fixedly connected into the fan blade seat; an adjusting assembly for finely adjusting the angle of the fan blade is arranged on the mounting rod; a first vibration probe, a second vibration probe, a balancing weight and a third motor are arranged, and the vibration frequency of the axial flow fan body and the vibration frequency of the two sides of the support are detected through the first vibration probe and the second vibration probe; according to the axial flow fan, the transmitted data is analyzed, and the vibration frequency of the axial flow fan body and the support is adjusted according to the analyzed result, so that resonance is avoided, and the service life of the axial flow fan is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of axial flow fans and relates to an axial flow fan which avoids resonance. Background Art

[0002] Axial flow fans are electromechanical products widely used in industry, commerce, agriculture and other fields. Their main function is to achieve wind power conversion by inhaling and exhausting airflow. Axial flow fans involve many aspects such as the structure of the equipment itself, the use environment, and operation. Resonance can cause the bearings and blades inside the axial flow fan to be subjected to excessive alternating forces, which are prone to fatigue damage or even breakage under long-term action.

[0003] A resonance control device for a power generation wind turbine disclosed in Chinese patent CN220815897U includes a tower, a shell is fixedly connected to the top of the tower, a base is fixedly connected to the middle position of the top rear end of the shell, a connecting column is fixedly connected to the middle position of the top of the base, a rotating block is penetrated through the top of the connecting column and rotatably connected, a sound collecting cotton is provided on the inner wall of the shell, a vibration sensor is fixedly connected to the front end of the shell, a connecting block is provided on the outer wall of the vibration sensor, and a rotating shell is fixedly connected to the middle position of the front end outer wall of the connecting block.

[0004] When the existing resonance control device is in use, a vibration sensor is fixed on the shell, and the vibration generated by the fan unit is sensed by the vibration sensor, and the signal is then transmitted to the steering gear, which drives the fan blades to achieve fine adjustment of the angle, so that the vibration of the power generation fan becomes smaller, but it can only change the vibration frequency between the fan blades and the connecting rod. When the vibration frequency between the frame and the fan blades is the same, resonance will still occur, resulting in fatigue damage of components and shortening the service life of the equipment.

[0005] In order to solve the above problems, the utility model proposes an axial flow fan which avoids resonance. Utility Model Content

[0006] In order to solve the problems existing in the background technology, the utility model proposes an axial flow fan which avoids resonance.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows: an axial flow fan for avoiding resonance, comprising an axial flow fan bracket and an axial flow fan body, the axial flow fan body being fixedly arranged on the axial flow fan bracket; a first motor is fixedly installed inside the axial flow fan body through a mounting ring; a fan blade seat is fixedly connected to the output shaft of the first motor; a dust block is fixedly connected to the front side of the fan blade seat; a plurality of fan blades are arranged on the outer side of the fan blade seat in a circular shape and rotate evenly; a mounting rod is fixedly connected to the inside of the fan blade seat; an adjustment component for fine-tuning the angle of the fan blade is arranged on the mounting rod; a first vibration probe is fixedly installed on the inner wall of the fan blade seat;

[0008] The axial flow fan bracket includes a column, a side beam, a cross beam, a side support beam and a bottom beam; an inner slide groove is opened inside the side beam; a counterweight block is slidably installed inside the inner slide groove; a second vibration probe is fixedly installed on the inner wall of the inner slide groove; the second vibration probe and the first vibration probe are both electrically connected to a controller arranged inside the inner slide groove; a driving component for driving the counterweight block to move is arranged inside the inner slide groove.

[0009] Preferably, two side beams are provided; the two side beams are respectively fixedly connected to the two ends of the opposite surfaces of the two cross beams; the bottom beam is fixedly connected to the middle position of the opposite surfaces of the two cross beams; the two ends of the upper end surface of the front cross beam are fixedly connected to columns; the two ends of the upper end surface of the rear cross beam are fixedly connected to side support beams; the other end of the side support beam is fixedly welded to the corresponding side wall of the column; the axial flow fan body is fixedly arranged on the top of the column.

[0010] Preferably, the top ends of the columns are provided with assembly grooves; both sides of the axial flow fan body are fixedly connected with mounting blocks; and the bottom ends of the mounting blocks are fixedly connected to the inside of the assembly grooves.

[0011] Preferably, the driving assembly includes a mounting plate; the mounting plate is fixedly mounted inside the inner slide groove; a third motor is fixedly mounted on the mounting plate; a lead screw is fixedly connected to the output end of the third motor; and the lead screw is threadedly connected to the counterweight block.

[0012] Preferably, one end of the fan blade close to the fan blade seat is fixedly connected with a connecting rod; the other end of the connecting rod rotates and penetrates into the interior of the fan blade seat.

[0013] Preferably, the adjustment assembly includes a second motor; the second motor is fixedly mounted on the mounting rod; a second conical wheel is fixedly connected to the output shaft of the second motor; the end of the connecting rod facing away from the fan blades is fixedly connected to the first conical wheel; the first conical wheel is meshingly connected to the second conical wheel.

[0014] Preferably, the adjustment assembly also includes a cylinder; the cylinder is fixedly mounted on the mounting rod; the output end of the cylinder is fixedly connected to a support plate; the end of the connecting rod facing away from the fan blades is fixedly connected to a gear; the support plate is fixedly connected to a gear rod at a position corresponding to the gear; the gear rod is meshingly connected to the gear.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The resonance-avoiding axial flow fan is provided with a first vibration probe, a second vibration probe, a counterweight and a third motor, and uses the first vibration probe and the second vibration probe to detect the vibration frequency of the axial flow fan body and the vibration frequency of both sides of the bracket; and analyzes the transmitted data, and then adjusts the vibration frequency of the axial flow fan body and the bracket according to the analysis result, so that the vibration frequency of the axial flow fan body and the bracket are different; thereby avoiding the occurrence of resonance and increasing the service life of the axial flow fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 is a cross-sectional view of a fan blade seat of Embodiment 1 of the utility model;

[0019] Figure 3 This is a fan blade structure diagram of Embodiment 1 of the present utility model;

[0020] Figure 4 This utility model Figure 3 The enlarged schematic diagram at A in the middle;

[0021] Figure 5 is a cross-sectional view of a fan blade seat of Embodiment 2 of the present utility model;

[0022] Figure 6 This is a fan blade structure diagram of Embodiment 2 of the present utility model;

[0023] Figure 7 This utility model Figure 6 Enlarged schematic diagram of point B in the middle.

[0024] In the figure: 1. axial fan body; 2. first motor; 3. mounting ring; 4. mounting block; 5. fan blade; 6. dust block; 7. fan blade seat; 8. mounting plate; 9. third motor; 10. screw; 11. counterweight; 12. first conical wheel; 13. connecting rod; 14. second conical wheel; 15. mounting rod; 16. first vibration probe; 17. second motor; 18. gear; 19. gear rod; 20. support plate; 21. cylinder; 22. column; 23. side beam; 24. cross beam; 25. side support beam; 26. bottom beam; 27. second vibration probe; 28. inner slide groove. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example 1: Figure 1-Figure 4As shown, the technical solution adopted by the utility model is as follows: an axial flow fan for avoiding resonance, comprising an axial flow fan bracket and an axial flow fan body 1, wherein the axial flow fan body 1 is fixedly arranged on the axial flow fan bracket. A first motor 2 is fixedly installed inside the axial flow fan body 1 through a mounting ring 3. A fan blade seat 7 is fixedly connected to the output shaft of the first motor 2. A dust block 6 is fixedly connected to the front side of the fan blade seat 7. A plurality of fan blades 5 are uniformly rotated and arranged in a circular shape on the outer side of the fan blade seat 7. A mounting rod 15 is fixedly connected to the inside of the fan blade seat 7. An adjustment component for fine-tuning the angle of the fan blade 5 is arranged on the mounting rod 15.

[0027] Furthermore, one end of the fan blade 5 close to the fan blade seat 7 is fixedly connected with a connecting rod 13. The other end of the connecting rod 13 rotates and penetrates into the interior of the fan blade seat 7.

[0028] The adjustment assembly includes a second motor 17. The second motor 17 is fixedly mounted on the mounting rod 15. A second conical wheel 14 is fixedly connected to the output shaft of the second motor 17. The end of the connecting rod 13 away from the fan blade 5 is fixedly connected to the first conical wheel 12. The first conical wheel 12 is meshedly connected with the second conical wheel 14.

[0029] A first vibration probe 16 is fixedly mounted on the inner wall of the fan blade seat 7 .

[0030] The axial flow fan support includes a column 22, a side beam 23, a cross beam 24, a side support beam 25 and a bottom beam 26. An inner slide groove 28 is provided inside the side beam 23. A counterweight 11 is slidably installed inside the inner slide groove 28. A second vibration probe 27 is fixedly installed on the inner wall of the inner slide groove 28. The second vibration probe 27 and the first vibration probe 16 are both electrically connected to a controller arranged inside the inner slide groove 28. A driving component for driving the counterweight 11 to move is arranged inside the inner slide groove 28.

[0031] The driving assembly includes a mounting plate 8. The mounting plate 8 is fixedly mounted inside the inner slide groove 28. A third motor 9 is fixedly mounted on the mounting plate 8. A lead screw 10 is fixedly connected to the output end of the third motor 9. The lead screw 10 is threadedly connected to a counterweight 11.

[0032] Two side beams 23 are provided. The two side beams 23 are fixedly connected to the two opposite ends of the two cross beams 24. The bottom beam 26 is fixedly connected to the middle position of the opposite faces of the two cross beams 24. The two ends of the upper end face of the front cross beam 24 are fixedly connected to the columns 22. The two ends of the upper end face of the rear cross beam 24 are fixedly connected to the side support beams 25. The other end of the side support beam 25 is fixedly welded to the side wall of the corresponding column 22. The axial flow fan body 1 is fixedly arranged at the top of the column 22.

[0033] It should be noted that the cross beam 24 , the side beam 23 , the bottom beam 26 , the column 22 and the side support beam 25 are all made of channel steel.

[0034] The top of the column 22 is provided with an assembly groove. Both sides of the axial flow fan body 1 are fixedly connected with a mounting block 4. The bottom end of the mounting block 4 is fixedly connected inside the assembly groove, and the connection between the mounting block 4 and the assembly groove is welding or bolt connection.

[0035] Working principle:

[0036] When in use, the first motor 2 is started, and the rotation of the first motor 2 drives the fan blade seat 7 to rotate, and the rotation of the fan blade seat 7 drives the fan blades 5 to rotate. The first vibration probe 16 in the fan blade seat 7 can detect the vibration frequency of the axial flow fan body 1 when it is running.

[0037] The first vibration probe 16 and the two second vibration probes 27 in this example can transmit the vibration frequency of the current axial flow fan body 1 and the vibration frequencies on both sides of the bracket to the controller. The controller analyzes the transmitted data, and based on the analysis results, the controller controls the start and stop of the second motor 17 and the third motor 9, thereby driving the corresponding components in its structure to adjust the vibration frequency of the axial flow fan body 1 and the bracket.

[0038] The first vibration probe 16 transmits data to the controller, and the controller analyzes the data to control the second motor 17 to rotate. The rotation of the second motor 17 drives the second conical wheel 14 to rotate. The rotation of the second conical wheel 14 drives the first conical wheel 12 meshing therewith to rotate. The rotation of the first conical wheel 12 drives the connecting rod 13 to rotate. The rotation of the connecting rod 13 drives the fan blades 5 to rotate, thereby adjusting the angle between the fan blades 5 and the fan blade seats 7. The vibration frequency of the axial flow fan body 1 is adjusted by adjusting the angle of the fan blades 5.

[0039] Known methods for eliminating resonance include: changing the frequency (resonance can be eliminated by changing the vibration frequency. This can be achieved by adjusting the mass, elasticity and stiffness of the object. When the natural frequency of the object is different from the external excitation frequency, the resonance will be weakened or lost), using buffer materials, changing the shape or structure of the object, adjusting the external excitation, using anti-vibration devices, etc. This example mainly uses frequency adjustment so that the dynamic vibration frequency of the axial flow fan body 1 during operation is not at the same amplitude as the vibration frequency of the bracket, thereby avoiding the resonance problem between the two. The second vibration probe 27 can detect the vibration frequency on both sides of the bracket and transmit it to the controller. The controller controls the third motor 9 to start and drive the lead screw 10 to rotate, thereby driving the counterweight 11 to move to different positions of the bracket side beam 23, thereby changing the position of the center of gravity of the bracket, and then adjusting the vibration frequency of the bracket.

[0040] Example 2: Figure 5-Figure 7As shown, the difference between this embodiment and embodiment 1 is that the adjustment assembly includes a cylinder 21. The cylinder 21 is fixedly mounted on the mounting rod 15. The output end of the cylinder 21 is fixedly connected to a support plate 20. The end of the connecting rod 13 away from the fan blade 5 is fixedly connected to a gear 18. The position of the support plate 20 corresponding to the gear 18 is fixedly connected to a gear rod 19. The gear rod 19 is meshed and connected with the gear 18.

[0041] Working principle:

[0042] When in use, the first vibration probe 16 transmits the current vibration frequency of the axial flow fan body 1 to the controller, and analyzes the transmitted data. Based on the analysis results, the controller controls the output end of the cylinder 21 to extend, thereby driving the support plate 20 to move. The movement of the support plate 20 drives the gear rod 19 to move. The movement of the gear rod 19 drives the gear 18 meshing with it to rotate. The rotation of the gear 18 drives the connecting rod 13 to rotate. The rotation of the connecting rod 13 drives the fan blades 5 to rotate, thereby adjusting the angle between the fan blades 5 and the fan blade seat 7. The amplitude frequency of the axial flow fan body 1 is adjusted by adjusting the angle of the fan blades 5, thereby avoiding the harm caused by resonance between the two.

[0043] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An axial flow fan for avoiding resonance, characterized in that: The invention comprises an axial flow fan bracket and an axial flow fan body (1), wherein the axial flow fan body (1) is fixedly arranged on the axial flow fan bracket; a first motor (2) is fixedly installed inside the axial flow fan body (1) via a mounting ring (3); a fan blade seat (7) is fixedly connected to the output shaft of the first motor (2); a dust block (6) is fixedly connected to the front side of the fan blade seat (7); a plurality of fan blades (5) are evenly rotated and arranged in a circular shape on the outer side of the fan blade seat (7); a mounting rod (15) is fixedly connected inside the fan blade seat (7); an adjustment component for fine-tuning the angle of the fan blade (5) is arranged on the mounting rod (15); a first vibration probe (16) is fixedly installed on the inner wall of the fan blade seat (7); The axial flow fan bracket comprises a column (22), a side beam (23), a cross beam (24), a side support beam (25) and a bottom beam (26); an inner slide groove (28) is provided inside the side beam (23); a counterweight (11) is slidably installed inside the inner slide groove (28); a second vibration probe (27) is fixedly installed on the inner wall of the inner slide groove (28); the second vibration probe (27) and the first vibration probe (16) are both electrically connected to a controller arranged inside the inner slide groove (28); and a driving component for driving the counterweight (11) to move is arranged inside the inner slide groove (28).

2. The axial flow fan for avoiding resonance according to claim 1, characterized in that: Two side beams (23) are provided; the two side beams (23) are respectively fixedly connected to the two ends of the opposite surfaces of the two cross beams (24); the bottom beam (26) is fixedly connected to the middle position of the opposite surfaces of the two cross beams (24); the two ends of the upper end surface of the front cross beam (24) are fixedly connected to the columns (22); the two ends of the upper end surface of the rear cross beam (24) are fixedly connected to the side support beams (25); the other end of the side support beam (25) is fixedly welded to the side wall of the corresponding column (22); the axial flow fan body (1) is fixedly arranged on the top of the column (22).

3. The axial flow fan for avoiding resonance according to claim 2, characterized in that: The top ends of the upright columns (22) are each provided with an assembly groove; both sides of the axial flow fan body (1) are fixedly connected with mounting blocks (4); and the bottom ends of the mounting blocks (4) are fixedly connected inside the assembly groove.

4. The axial flow fan for avoiding resonance according to claim 1, characterized in that: The driving assembly comprises a mounting plate (8); the mounting plate (8) is fixedly mounted inside the inner slide groove (28); a third motor (9) is fixedly mounted on the mounting plate (8); a lead screw (10) is fixedly connected to the output end of the third motor (9); and the lead screw (10) is threadedly connected to the counterweight (11).

5. The resonance-avoiding axial flow fan according to claim 1, characterized in that: One end of the fan blade (5) close to the fan blade seat (7) is fixedly connected to a connecting rod (13); the other end of the connecting rod (13) rotates and penetrates into the interior of the fan blade seat (7).

6. The axial flow fan for avoiding resonance according to claim 1, characterized in that: The adjustment assembly comprises a second motor (17); the second motor (17) is fixedly mounted on the mounting rod (15); a second conical wheel (14) is fixedly connected to the output shaft of the second motor (17); an end of the connecting rod (13) away from the fan blade (5) is fixedly connected to the first conical wheel (12); and the first conical wheel (12) is meshingly connected to the second conical wheel (14).

7. The axial flow fan for avoiding resonance according to claim 1, characterized in that: The adjustment assembly further comprises a cylinder (21); the cylinder (21) is fixedly mounted on the mounting rod (15); the output end of the cylinder (21) is fixedly connected to a support plate (20); the end of the connecting rod (13) away from the fan blade (5) is fixedly connected to a gear (18); a gear rod (19) is fixedly connected to a position of the support plate (20) corresponding to the gear (18); and the gear rod (19) is meshingly connected to the gear (18).

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