Anti-reversion device for cantilever fan

Abstract

The invention discloses an anti-reversion device for a cantilever fan, and relates to the technical field of cantilever fans, the anti-reversion device comprises a base, a fan blade assembly and a driving assembly, a supporting frame is arranged on the outer side of the top of the base, a first electric push rod is arranged at the outer end of the supporting frame, and a fitting seat is arranged at the output end of the first electric push rod. When a motor is just started, a second electric push rod does not push a butt-joint pile to be in butt joint with a butt-joint groove, an extrusion seat at the outer end of the butt-joint pile extrudes a pressure-sensitive button to enable an electromagnet to be electrified to attract and lock a first driving gear and a first driving rotating shaft, and at the moment, the first driving rotating shaft rotates to enable the first driving gear and a driven gear to be meshed to drive a butt-joint seat to rotate; due to the fact that the number of teeth of the first driving gear and the number of teeth of the driven gear are large, the motor needs high rotating speed to drive the driven gear to rotate, and due to the fact that equipment is interfered by reverse rotating force before working, torque of the motor during initial rotation can be fully released through the design, and therefore the probability of damage to the motor is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cantilever fans, and in particular to a cantilever fan anti-reversal device. Background Art

[0002] Cantilever centrifugal fan is a ventilation device that uses the principle of centrifugal force to accelerate the gas. It is composed of impeller, motor, casing, bracket and other parts. Cantilever centrifugal fan is a common industrial ventilation equipment, widely used in factories, mines, tunnels, cooling towers and other places for ventilation, dust removal and cooling. Its main feature is that the impeller is suspended at one end of the shaft to form a cantilever structure. This design makes the installation and maintenance of the fan more convenient.

[0003] When the cantilever centrifugal fan is in use, an induced draft fan system is installed in front of the fan. When the induced draft fan system is started, it is very easy to cause the impeller of the cantilever centrifugal fan behind to reverse. At this time, if the booster fan is started (forward rotation), it will have a huge impact on the motor of the booster fan, causing it to fail to start or even burn the motor.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a cantilever fan anti-reversal device is proposed. Summary of the invention

[0005] The object of the present invention is to provide a cantilever fan anti-reversal device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a cantilever fan anti-reversal device, comprising a base, a blade assembly and a drive assembly, a support frame is arranged on the top outer side of the base, and a first electric push rod is arranged on the outer end of the support frame, a fitting seat is arranged on the output end of the first electric push rod, a ratchet is arranged inside the support frame, and a blade assembly is arranged on the inner side of the support frame, the blade assembly comprises a driven shaft, a docking seat, blades, driven tooth grooves, a ratchet and a driven gear, a docking seat is arranged on the outer end of the driven shaft, and a blade is arranged on the front end of the driven shaft, a driven tooth groove is opened at the outer middle end of the docking seat, and ratchets are arranged at both ends of the outer side of the docking seat, and a driven gear is arranged at the rear outer end of the docking seat.

[0007] Furthermore, the first electric push rod pushes the fitting seat to move and fit with the docking seat, and the fitting seat is arranged on both upper and lower sides of the docking seat.

[0008] Furthermore, the docking seat and the ratchet are an integrated structure, and the ratchet is meshed with the ratchet teeth.

[0009] Furthermore, the support frame is sleeve-connected to the docking seat, and the outer contour curvature of the docking seat matches the outer contour curvature of the fitting seat.

[0010] Furthermore, a driving assembly is disposed at the outer end of the base, and the driving assembly includes a motor, a first active rotating shaft, a second electric push rod, a docking pile, an extrusion seat, a pressure-sensitive button, an electromagnet and a first active gear. The output end of the motor is provided with the first active rotating shaft, and the second electric push rod is disposed inside the first active rotating shaft, the output end of the second electric push rod is provided with a docking pile, and the outer end of the docking pile is provided with an extrusion seat, the interior of the first active rotating shaft is provided with a pressure-sensitive button, and the pressure-sensitive button is electrically connected to the electromagnet, and the outer end of the first active rotating shaft is provided with a first driving gear.

[0011] Furthermore, the first driving gear is sleeve-connected with the first driving shaft, and the electromagnet is energized to adsorb the first driving gear.

[0012] Furthermore, the first driving gear is meshed with the driven gear, and the first driving shaft drives the docking seat and the driven shaft to rotate through the meshing of the first driving gear and the driven gear.

[0013] Furthermore, the driving assembly also includes a second driving shaft, a docking groove and a second driving gear. The inner side of the second driving shaft is provided with a docking groove, and the outer end of the second driving shaft is provided with a second driving gear.

[0014] Furthermore, the outer contour size of the docking pile matches the inner contour size of the docking groove, and when the docking pile is docked with the docking groove, the first active rotating shaft drives the second active rotating shaft to rotate.

[0015] Furthermore, the size of the second driving gear is larger than that of the first driving gear, and the second driving gear is meshed with the driven tooth groove.

[0016] The present invention provides a cantilever fan anti-reversal device, which has the following beneficial effects: before the equipment of the present invention works, when the induced draft fan system outside the equipment is started to make the fan blades generate reverse rotation force, the fan blades can transmit the torque during reverse rotation to the docking seat through the driven rotating shaft, the docking seat is arranged inside the supporting frame, and the ratchet at the outer end of the docking seat is meshed with the ratchet teeth in the supporting frame, when the docking seat is in a forward rotation state, the ratchet and the ratchet are in an open and closed state, at this time the docking seat can rotate normally, and when the fan blades generate reverse rotation force to drive the docking seat to rotate reversely, the ratchet and the ratchet will prevent the docking seat from rotating by engaging, through this design, it can effectively prevent the fan blades from rotating reversely and causing the motor to be damaged by impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a cantilever fan anti-reversal device in the front view of the present invention;

[0018] Figure 2It is a rear view overall structural schematic diagram of a cantilever fan anti-reversal device of the present invention;

[0019] Figure 3 A schematic diagram of the structure of a fan blade assembly of a cantilever fan anti-reversal device of the present invention;

[0020] Figure 4 It is a front view structural schematic diagram of a driving assembly of a cantilever fan anti-reversal device of the present invention;

[0021] Figure 5 It is a rear view structural schematic diagram of a driving assembly of a cantilever fan anti-reversal device of the present invention;

[0022] Figure 6 A schematic cross-sectional view of a fan blade assembly of a cantilever fan anti-reversal device according to the present invention;

[0023] Figure 7 It is a schematic cross-sectional structure diagram of a driving assembly of a cantilever fan anti-reversal device of the present invention;

[0024] Figure 8 A cantilever fan anti-reversal device according to the present invention Figure 7 Enlarged structural diagram at A in the middle.

[0025] In the figure: 1. base; 2. support frame; 3. first electric push rod; 4. fitting seat; 5. ratchet; 6. fan blade assembly; 601. driven shaft; 602. docking seat; 603. fan blade; 604. driven tooth groove; 605. ratchet; 606. driven gear; 7. drive assembly; 701. motor; 702. first active shaft; 703. second electric push rod; 704. docking pile; 705. extrusion seat; 706. pressure-sensitive button; 707. electromagnet; 708. first active gear; 709. second active shaft; 710. docking groove; 711. second active gear. DETAILED DESCRIPTION

[0026] See also Figures 1 to 8The present invention provides a technical solution: a cantilever fan anti-reversal device, comprising a base 1, a blade assembly 6 and a driving assembly 7, a support frame 2 is arranged on the top outer side of the base 1, and a first electric push rod 3 is arranged on the outer end of the support frame 2, a fitting seat 4 is arranged on the output end of the first electric push rod 3, a ratchet 5 is arranged inside the support frame 2, and a blade assembly 6 is arranged on the inner side of the support frame 2, the blade assembly 6 comprises a driven shaft 601, a docking seat 602, blades 603, a driven tooth groove 604, a ratchet 605 and a driven gear 606, a docking seat 602 is arranged on the outer end of the driven shaft 601, and a blade 603 is arranged on the front end of the driven shaft 601, a driven tooth groove 604 is opened at the outer middle end of the docking seat 602, and ratchets 605 are arranged at both ends of the outer side of the docking seat 602, and a driven gear 606 is arranged at the rear outer end of the docking seat 602.

[0027] See also Figures 1 to 8 The docking seat 602 and the ratchet 605 are an integrated structure, and the ratchet 605 is meshed with the ratchet teeth 5. The support frame 2 is sleeved and connected to the docking seat 602, and the outer contour curvature of the docking seat 602 matches the outer contour curvature of the fitting seat 4. The outer end of the base 1 is provided with a driving assembly 7, and the driving assembly 7 includes a motor 701, a first active shaft 702, a second electric push rod 703, a docking pile 704, an extrusion seat 705, a pressure-sensitive button 706, an electromagnet 707 and a first active tooth The output end of the motor 701 is provided with a first active shaft 702, and a second electric push rod 703 is arranged inside the first active shaft 702, a docking post 704 is arranged at the output end of the second electric push rod 703, and an extrusion seat 705 is arranged at the outer end of the docking post 704, a pressure-sensitive button 706 is arranged inside the first active shaft 702, and the pressure-sensitive button 706 is electrically connected to an electromagnet 707, and a first active gear 70 is arranged at the outer end of the first active shaft 702. 8. The first driving gear 708 is sleeved and connected with the first driving shaft 702, and the electromagnet 707 is energized to adsorb the first driving gear 708, the first driving gear 708 is meshed with the driven gear 606, and the first driving shaft 702 drives the docking seat 602 and the driven shaft 601 to rotate through the meshing of the first driving gear 708 and the driven gear 606. The driving assembly 7 also includes a second driving shaft 709, a docking groove 710 and a second driving gear 711. The inner side of the second driving shaft 709 is provided with a docking groove 710, and the outer end of the second driving shaft 709 is provided with a second driving gear 711. The outer contour size of the docking pile 704 matches the inner contour size of the docking groove 710, and when the docking pile 704 is docked with the docking groove 710, the first driving shaft 702 drives the second driving shaft 709 to rotate, the size of the second driving gear 711 is larger than the size of the first driving gear 708, and the second driving gear 711 is meshed with the driven tooth groove 604;

[0028] The specific operation is as follows: the second electric push rod 703 works to make the docking post 704 extend into the docking groove 710, so that the squeeze of the pressure-sensitive button 706 by the squeezing seat 705 is released. When the pressure-sensitive button 706 does not sense the squeezing force, the electromagnet 707 loses power, so that the lock between the first active shaft 702 and the first active gear 708 is released. At this time, the motor 701 works to drive the first active shaft 702 to rotate. The first active shaft 702 can transfer the rotational torque to the second active shaft 709 through the docking post 704 and the docking groove 710. During the rotation process, the second active shaft 709 can drive the docking seat 602 and the driven shaft 601 to rotate through the engagement of the second active gear 711 with the driven tooth groove 604. , and the driven shaft 601 is connected with the fan blade 603, which enables the fan blade 603 to realize the normal operation of the cantilever fan by rotating. Before the equipment works, the induced draft fan system outside the equipment is started to make the fan blade 603 generate a reverse rotation force, and the fan blade 603 can transmit the torque during the reverse rotation to the docking seat 602 through the driven shaft 601. The docking seat 602 is arranged inside the support frame 2, and the ratchet 605 at the outer end of the docking seat 602 is meshed with the ratchet 5 in the support frame 2. When the docking seat 602 is in a forward rotation state, the ratchet 605 and the ratchet 5 are in an open and closed state. At this time, the docking seat 602 can rotate normally, and when the fan blade 603 generates a reverse rotation force to drive the docking seat 602 to rotate reversely, the ratchet 605 and the ratchet 5 will be engaged to avoid The docking seat 602 rotates. Through this design, it can effectively prevent the fan blades 603 from rotating in the opposite direction, causing the motor 701 to be damaged by the impact force. When the device is in use, if the fan blades 603 want to be quickly decelerated, the second electric push rod 703 drives the docking post 704 to move out of the docking slot 710, so that the first active shaft 702 and the second active shaft 709 can be separated. At this time, the second electric push rod 703 drives the docking post 704 to rotate to the position where the squeezing seat 705 squeezes the pressure-sensitive button 706. The pressure-sensitive button 706 is squeezed and controlled to energize the electromagnet 707, so that the first driving gear 708 can be adsorbed and locked with the first active shaft 702. At this time, when the motor 701 rotates, the first driving gear 708 and the driven gear 60 6, the meshing drives the fan blade 603 to rotate. Since the tooth number ratio of the first driving gear 708 to the driven gear 606 is larger than that of the driven tooth groove 604 and the second driving gear 711, the motor 701 can reduce the speed of the fan blade 603 without reducing the speed quickly, which can greatly reduce the damage of the motor 701 due to rapid speed reduction. In addition, when the fan blade 603 wants to stop rotating quickly, the second electric push rod 703 drives the docking pile 704 to continue to retract, so that the extrusion seat 705 is separated from the pressure-sensitive button 706, which makes the electromagnet 707 lose power and enables the first driving gear 708 to be unlocked from the first driving shaft 702. At this time, the torque of the motor 701 during rotation will not be transmitted to the driven shaft 601. At this time, the fitting seat 4 is driven to move by the first electric push rod 3.The fitting seat 4 can be locked with the docking seat 602, which can make the fan blade 603 stop rotating quickly. In this process, the locking force will not be transmitted to the motor 701, which can effectively prevent the fan blade 603 from stopping quickly and causing the motor 701 to malfunction or be damaged. In addition, when the motor 701 is just started, the second electric push rod 703 does not push the docking post 704 to dock with the docking groove 710, and the squeezing seat 705 at the outer end of the docking post 704 squeezes the pressure-sensitive button 706 to energize the electromagnet 707 to couple the first driving gear 708 with the first driving gear. The shaft 702 is adsorbed and locked. At this time, the first active shaft 702 rotates to make the first active gear 708 mesh with the driven gear 606 to drive the docking seat 602 to rotate. Because the number of teeth of the first active gear 708 and the driven gear 606 is relatively large, the motor 701 needs a higher speed to drive the driven gear 606 to rotate. Because the equipment is disturbed by the reverse rotation force before working, through this design, the torque of the motor 701 during the initial rotation can be fully released, thereby further reducing the probability of damage to the motor 701.

[0029] In summary, when the cantilever fan anti-reversal device is used, the second electric push rod 703 is first operated to make the docking pile 704 extend into the docking groove 710, so that the squeezing of the pressure-sensitive button 706 by the squeezing seat 705 is released. When the pressure-sensitive button 706 does not sense the squeezing force, the electromagnet 707 is de-energized, so that the locking of the first active shaft 702 and the first active gear 708 is released. At this time, the motor 701 is operated to drive the first active shaft 702 to rotate. The first active shaft 702 can transmit the rotating torque to the second active shaft 709 through the docking pile 704 and the docking groove 710. During the rotation process, the second active shaft 709 can drive the docking seat 602 and the driven shaft 601 to rotate through the meshing of the second active gear 711 and the driven tooth groove 604, and the driven shaft 601 is connected with the fan blade 603, so that the fan blade 603 can realize the normal operation of the cantilever fan by rotating;

[0030] Then, before the device is working, when the induced draft fan system outside the device is started to make the fan blades 603 generate a reverse rotation force, the fan blades 603 can transmit the torque during the reverse rotation to the docking seat 602 through the driven shaft 601. The docking seat 602 is placed inside the support frame 2, and the ratchet 605 at the outer end of the docking seat 602 is meshed with the ratchet 5 in the support frame 2. When the docking seat 602 is in a forward rotation state, the ratchet 605 and the ratchet 5 are in an open and closed state. At this time, the docking seat 602 can rotate normally. When the fan blades 603 generate a reverse rotation force to drive the docking seat 602 to rotate reversely, the ratchet 605 and the ratchet 5 will prevent the docking seat 602 from rotating by engaging. Through this design, it can effectively prevent the fan blades 603 from rotating reversely, causing the motor 701 to be damaged by the impact force.

[0031] Then, when the fan blade 603 is to be decelerated quickly during use, the second electric push rod 703 drives the docking pile 704 to be moved out of the docking groove 710, so that the first active shaft 702 and the second active shaft 709 can be separated. At this time, the second electric push rod 703 drives the docking pile 704 to rotate to the position where the extrusion seat 705 squeezes the pressure-sensitive button 706. The pressure-sensitive button 706 is squeezed and controlled to energize the electromagnet 707, so that the first driving gear 708 can be adsorbed and locked with the first driving shaft 702. At this time, when the motor 701 rotates, the fan blade 603 can be driven to rotate through the meshing of the first driving gear 708 and the driven gear 606. Because the tooth number ratio of the first driving gear 708 to the driven gear 606 is larger than that of the driven tooth groove 604 and the second driving gear 711, the motor 701 does not need to quickly reduce the speed to achieve the deceleration of the fan blade 603, which can greatly reduce the damage of the motor 701 due to rapid deceleration.

[0032] When the fan blade 603 wants to stop rotating quickly, the second electric push rod 703 drives the docking pile 704 to continue to retract, so that the extrusion seat 705 is separated from the pressure-sensitive button 706, which makes the electromagnet 707 lose power and the first driving gear 708 can be unlocked from the first driving shaft 702. At this time, the torque of the motor 701 during rotation will not be transmitted to the driven shaft 601. At this time, the first electric push rod 3 drives the fitting seat 4 to move, so that the fitting seat 4 and the docking seat 602 can be locked, which can stop the fan blade 603 from rotating quickly. In this process, the locking force will not be transmitted to the motor 701, which can effectively prevent the fan blade 603 from stopping quickly and causing the motor 701 to malfunction or damage.

[0033] Finally, when the motor 701 is just started, the second electric push rod 703 does not push the docking pile 704 to dock with the docking groove 710. The extrusion seat 705 at the outer end of the docking pile 704 squeezes the pressure-sensitive button 706 to energize the electromagnet 707 to adsorb and lock the first driving gear 708 and the first driving shaft 702. At this time, the first driving shaft 702 rotates to make the first driving gear 708 mesh with the driven gear 606 to drive the docking seat 602 to rotate. Because the number of teeth of the first driving gear 708 and the driven gear 606 is relatively large, the motor 701 needs a higher speed to drive the driven gear 606 to rotate. Because the equipment is disturbed by the reverse rotation force before working, through this design, the torque of the motor 701 during the initial rotation can be fully released, thereby further reducing the probability of damage to the motor 701.

[0034] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A cantilever fan anti-reversal device, characterized in that: The invention comprises a base (1), a fan blade assembly (6) and a driving assembly (7); a supporting frame (2) is arranged on the outer side of the top of the base (1); a first electric push rod (3) is arranged on the outer end of the supporting frame (2); a fitting seat (4) is arranged on the output end of the first electric push rod (3); a ratchet (5) is arranged inside the supporting frame (2); a fan blade assembly (6) is arranged on the inner side of the supporting frame (2); the fan blade assembly (6) comprises a driven rotating shaft (601), a docking seat (602) and a connecting rod (603). , fan blades (603), driven tooth grooves (604), ratchet wheels (605) and driven gears (606); a docking seat (602) is provided at the outer end of the driven rotating shaft (601), and a fan blade (603) is provided at the front end of the driven rotating shaft (601); a driven tooth groove (604) is provided at the outer middle end of the docking seat (602), and ratchet wheels (605) are provided at both ends of the outer portion of the docking seat (602); and a driven gear (606) is provided at the rear outer end of the docking seat (602).

2. The cantilever fan anti-reversal device according to claim 1, characterized in that: The first electric push rod (3) pushes the fitting seat (4) to move and fit with the docking seat (602), and the fitting seat (4) is arranged on both the upper and lower sides of the docking seat (602).

3. The cantilever fan anti-reversal device according to claim 1, characterized in that: The docking seat (602) and the ratchet wheel (605) are an integrated structure, and the ratchet wheel (605) is meshed with the ratchet teeth (5).

4. The cantilever fan anti-reversal device according to claim 1, characterized in that: The support frame (2) is sleeve-connected to the docking seat (602), and the outer contour curvature of the docking seat (602) matches the outer contour curvature of the fitting seat (4).

5. The cantilever fan anti-reversal device according to claim 1, characterized in that: A driving assembly (7) is arranged at the outer end of the base (1), and the driving assembly (7) comprises a motor (701), a first active rotating shaft (702), a second electric push rod (703), a docking pile (704), a pressing seat (705), a pressure-sensitive button (706), an electromagnet (707) and a first active gear (708). The output end of the motor (701) is provided with the first active rotating shaft (702), and the second electric push rod (703) is arranged inside the first active rotating shaft (702). The output end of the second electric push rod (703) is provided with a docking pile (704), and the outer end of the docking pile (704) is provided with a pressing seat (705). The first active rotating shaft (702) is provided with a pressure-sensitive button (707), and the pressure-sensitive button (707) is electrically connected to the electromagnet (708). The outer end of the first active rotating shaft (702) is provided with a first active gear (708).

6. The cantilever fan anti-reversal device according to claim 5, characterized in that: The first driving gear (708) is sleeve-connected with the first driving rotating shaft (702), and the electromagnet (708) is energized to adsorb the first driving gear (708).

7. The cantilever fan anti-reversal device according to claim 5, characterized in that: The first driving gear (708) is meshed with the driven gear (606), and the first driving shaft (702) drives the docking seat (602) and the driven shaft (601) to rotate through the meshing of the first driving gear (708) and the driven gear (606).

8. The cantilever fan anti-reversal device according to claim 5, characterized in that: The driving assembly (7) further comprises a second driving shaft (709), a docking groove (710) and a second driving gear (711); the docking groove (710) is provided on the inner side of the second driving shaft (709), and the second driving gear (711) is provided on the outer end of the second driving shaft (709).

9. The cantilever fan anti-reversal device according to claim 8, characterized in that: The outer contour size of the docking pile (704) matches the inner contour size of the docking groove (710), and when the docking pile (704) and the docking groove (710) are docked, the first active rotating shaft (702) drives the second active rotating shaft (709) to rotate.

10. The cantilever fan anti-reversal device according to claim 8, characterized in that: The size of the second driving gear (711) is larger than that of the first driving gear (708), and the second driving gear (711) is meshed with the driven tooth groove (604).

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