Anti-inversion device of fan

Abstract

The utility model discloses an anti-inversion device for a fan, which belongs to the technical field of fans, and comprises a fan main rotating shaft fixed with a motor rotating shaft, an anti-inversion mechanism is arranged outside the fan main rotating shaft, the anti-inversion mechanism comprises an anti-rotation brake seat, an anti-rotation brake disc and an annular non-slip brake pad, the anti-rotation brake seat is sleeved on the surface of the fan main rotating shaft, and the anti-rotation brake disc is sleeved on the surface of the fan main rotating shaft. The anti-rotation brake disc is arranged on one side of the anti-rotation brake base, and the annular anti-slip brake pad is fixed to the end face, opposite to the anti-rotation brake base, of the anti-rotation brake disc. According to the anti-reverse-rotation mechanism, the anti-reverse-rotation brake disc can be controlled to be close to the anti-reverse-rotation brake base continuously, the annular anti-slip brake pad is used for being tightly attached to the anti-reverse-rotation brake base, and therefore the anti-reverse-rotation purpose of the draught fan is achieved, the anti-reverse-rotation brake base additionally arranged on the draught fan main rotating shaft is used for receiving anti-twisting force of the anti-reverse-rotation brake disc, and abrasion to the draught fan main rotating shaft can be reduced; and meanwhile, the axial anti-inversion mode of the anti-rotation brake disc can increase the arrangement area of the annular anti-slip brake pad and prevent the main rotating shaft of the fan from being extruded in the vertical direction.

Description

Technical Field

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

[0002] Fans are widely used in power production. During the operation of power plant boilers, induced draft fans, forced draft fans and primary fans are the three major fans of the boiler. The forced draft fan provides the required oxygen for boiler combustion, the primary fan provides power for the operation of the pulverizing system, and the induced draft fan pressurizes the tail flue and maintains the negative pressure in the furnace, thereby ensuring stable combustion inside the furnace. The current operation mode of fans is mostly parallel operation, connected by a connecting flue in the middle. The connecting flue is provided with a baffle door, but the connecting flue baffle door cannot be guaranteed to be absolutely tight. When one side of the fan stops operating or the fan inverter fails, the stopped fan is prone to reverse rotation. The reverse rotation of the fan causes the rotation direction of the impeller to be opposite to the rotating magnetic field direction of the motor stator, resulting in a larger starting current, which may even exceed the action current and time rectified by the current relay for the motor. In severe cases, the current may burn out the relay, resulting in the fan being unable to start normally, and in severe cases, the equipment may be damaged.

[0003] At present, the traditional anti-reversal mechanism of the fan generally uses brake pads to press against the main shaft of the fan and prevent it from twisting. Since the main shaft of the fan is generally cylindrical, the friction area between the arc-shaped brake pads and the shaft is small. The small braking friction area will reduce the anti-reversal performance when the brake pads are severely worn. In addition, there is a problem of local wear of the shaft due to the long-term anti-reversal contact between the shaft and the brake pads. In addition, the anti-reversal process will cause a vertical extrusion pressure on the shaft, and the extrusion pressure in this direction is likely to increase the firmness of the shaft assembly. Utility Model Content

[0004] The purpose of the utility model is to provide a fan anti-reversal device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fan anti-reversal device comprises a fan main shaft fixed to a motor shaft, an anti-reversal mechanism is arranged on the outside of the fan main shaft, the anti-reversal mechanism comprises an anti-rotation brake seat, an anti-rotation brake disc and an annular anti-slip brake pad, the anti-rotation brake seat is sleeved on the surface of the fan main shaft, the anti-rotation brake disc is arranged on one side of the anti-rotation brake seat, the annular anti-slip brake pad is fixed on an end face of the anti-rotation brake disc opposite to the anti-rotation brake seat, a distance adjustment mechanism is arranged below the fan main shaft, the distance adjustment mechanism comprises a positioning slide box, a positioning slider and a positioning screw, the positioning slide box is arranged below the anti-rotation brake disc, the positioning slider extends out of the sliding arm of the positioning slide box and is fixed on the lower part of the anti-rotation brake disc, and the positioning screw is passed through the interior of the positioning slide box.

[0006] It should be noted in the solution that a clearance opening is provided at the center of one end surface of the anti-rotation brake disc, and the diameter of the clearance opening is larger than the diameter of the main rotating shaft of the fan.

[0007] It is further worth noting that a fixing ring is fixed to one end of the anti-rotation brake seat away from the anti-rotation brake disc, and the fixing ring is sleeved and fixed on the surface of the main rotating shaft of the fan.

[0008] It should be further explained that the anti-rotation brake seat is suspended above the position adjustment slide box, and one end of the position adjustment slide box is fixed on the fan housing.

[0009] As a preferred implementation, the upper end surface of the position adjustment slide box is provided with a position adjustment sliding opening, and the sliding arm of the position adjustment sliding block is slidably connected to the position adjustment sliding opening of the position adjustment slide box.

[0010] As a preferred implementation, a positioning screw hole is provided at the center of one side surface of the positioning sliding block, and the positioning screw rod is threadedly connected to the positioning screw hole of the positioning sliding block.

[0011] As a preferred implementation, a driving motor is fixed to the inner wall of the positioning slide box, and the output shaft of the driving motor is fixed to one end of the positioning screw rod.

[0012] As a preferred implementation, a rotary bearing is embedded and fixed in an inner wall of one side of the position adjustment slide box, and one end of the position adjustment screw rod away from the driving motor is arranged at the rotary bearing.

[0013] Compared with the prior art, the fan anti-reverse device provided by the utility model has at least the following beneficial effects:

[0014] ⑴ Through the anti-reversal mechanism, the anti-rotation brake disc can be controlled to continuously approach the anti-rotation brake seat and the annular anti-slip brake pad can be used to press against the anti-rotation brake seat to achieve the purpose of preventing the fan from reversing. The anti-rotation brake seat added to the main shaft of the fan is used to receive the anti-torsion force of the anti-rotation brake disc, which can reduce the wear on the main shaft of the fan. At the same time, the axial anti-reversal method of the anti-rotation brake disc can increase the layout area of ​​the annular anti-slip brake pad and prevent vertical extrusion of the main shaft of the fan.

[0015] (2) Through the distance adjustment mechanism, when the annular anti-skid brake pad is replaced, the anti-rotation brake disc can be controlled to be away from the anti-rotation brake seat and a replacement operation space for the open annular anti-skid brake pad can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a three-dimensional diagram of the overall structure of the fan anti-reversal device of the utility model;

[0018] Figure 2 A three-dimensional diagram of the anti-rotation brake disc structure of the fan anti-reverse device of the utility model;

[0019] Figure 3 It is a three-dimensional diagram of the cross-sectional structure of the adjustment slide box of the fan anti-reversal device of the utility model;

[0020] Figure 4 This is a three-dimensional diagram of the structure of the annular anti-slip brake pad of the fan anti-reversal device of the utility model.

[0021] In the figure: 1. Main shaft of fan; 2. Anti-rotation brake seat; 3. Anti-rotation brake disc; 4. Annular anti-slip brake pad; 5. Adjustment slide box; 6. Adjustment slider; 7. Driving motor; 8. Adjustment screw rod; 9. Rotating bearing; 10. Adjustment slide mouth; 11. Adjustment screw hole; 12. Make way mouth; 13. Fixed collar. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the embodiments.

[0023] See also Figure 1-4 The utility model provides an anti-reversal device for a fan, comprising a main rotating shaft 1 of the fan fixed with the rotating shaft of a motor, an anti-reversal mechanism is arranged on the outside of the main rotating shaft 1 of the fan, the anti-reversal mechanism comprises an anti-rotation brake seat 2, an anti-rotation brake disc 3 and an annular anti-slip brake pad 4, the anti-rotation brake seat 2 is sleeved on the surface of the main rotating shaft 1 of the fan, the anti-rotation brake disc 3 is arranged on one side of the anti-rotation brake seat 2, the annular anti-slip brake pad 4 is fixed on an end face of the anti-rotation brake disc 3 opposite to the anti-rotation brake seat 2, a distance adjustment mechanism is arranged below the main rotating shaft 1 of the fan, the distance adjustment mechanism comprises a positioning slide box 5, a positioning slider 6 and a positioning screw 8, the positioning slide box 5 is arranged below the anti-rotation brake disc 3, the positioning slider 6 extends out of the sliding arm of the positioning slide box 5 and is fixed on the lower part of the anti-rotation brake disc 3, and the positioning screw 8 is passed through the interior of the positioning slide box 5.

[0024] Further Figure 1 , Figure 2 and Figure 3 As shown, it is worth explaining in detail that a clearance opening 12 is opened at the center of one end face of the anti-rotation brake disc 3, and the diameter of the clearance opening 12 is larger than the diameter of the fan main shaft 1. The anti-rotation brake seat 2 added to the fan main shaft 1 receives the anti-torsion force of the anti-rotation brake disc 3, which can reduce the wear on the fan main shaft 1.

[0025] Further Figure 3 As shown, it is worth to explain in detail that a fixing ring 13 is fixed to one end of the anti-rotation brake seat 2 away from the anti-rotation brake disc 3 , and the fixing ring 13 is sleeved and fixed on the surface of the fan main shaft 1 .

[0026] Further Figure 1 , Figure 2 and Figure 4 As shown, it is worth explaining in detail that the anti-rotation brake seat 2 is suspended above the position adjustment slide box 5, and one end of the position adjustment slide box 5 is fixed on the fan housing.

[0027] Further Figure 4 As shown, it is worth explaining in detail that a positioning slide opening 10 is provided on the upper end surface of the positioning slide box 5, and the sliding arm of the positioning slider 6 is slidably connected to the positioning slide opening 10 of the positioning slide box 5. The driving motor 7 drives the positioning screw 8 to rotate at the rotating bearing 9 inside the positioning slide box 5, and the positioning slider 6 threadedly connected to the positioning screw 8 slides along the inner cavity of the positioning slide box 5, so that the anti-rotation brake disc 3 can be controlled to continuously approach the anti-rotation brake seat 2 and the annular anti-slip brake pad 4 is used to close to the anti-rotation brake seat 2 to achieve the purpose of preventing the fan from reversing.

[0028] Further Figure 1 As shown, it is worth to explain in detail that a positioning screw hole 11 is opened at the center of one side surface of the positioning slider 6, and the positioning screw rod 8 is threadedly connected with the positioning screw hole 11 of the positioning slider 6.

[0029] Further Figure 1 As shown, it is worth to explain in detail that a driving motor 7 is fixed to the inner wall of the position adjustment slide box 5 , and the output shaft of the driving motor 7 is fixed to one end of the position adjustment screw rod 8 .

[0030] Further Figure 1 As shown, it is worth to explain in detail that a rotating bearing 9 is embedded and fixed in the inner wall of one side of the position adjustment slide box 5 , and the end of the position adjustment screw rod 8 away from the driving motor 7 is arranged at the rotating bearing 9 .

[0031] The present invention has the following working process: before use, one end of the positioning slide box 5 is fixed to the fan housing, and after the fan is stopped, the driving motor 7 is turned on, and the driving motor 7 drives the positioning screw rod 8 to rotate at the rotating bearing 9 inside the positioning slide box 5, and the positioning slide block 6 threadedly connected to the positioning screw rod 8 slides along the inner cavity of the positioning slide box 5, so that the anti-rotation brake disc 3 can be controlled to continuously approach the anti-rotation brake seat 2 and the annular anti-slip brake pad 4 is used to close to the anti-rotation brake seat 2 to achieve the purpose of preventing the fan from reversing, and the anti-rotation brake seat 2 added to the fan main shaft 1 is used to receive the anti-torsion force of the anti-rotation brake disc 3 to reduce the wear on the fan main shaft 1, and at the same time, the axial anti-reversal mode of the anti-rotation brake disc 3 can increase the layout area of ​​the annular anti-slip brake pad 4 and prevent the fan main shaft 1 from being squeezed in the vertical direction; when the annular anti-slip brake pad 4 is replaced, the anti-rotation brake disc 3 can be controlled to stay away from the anti-rotation brake seat 2 and provide an open annular anti-slip brake pad 4 replacement operation space.

[0032] In summary: the anti-rotation brake disc 3 can be controlled to continuously approach the anti-rotation brake seat 2 and the annular anti-slip brake pad 4 can be used to stick closely to the anti-rotation brake seat 2 to achieve the purpose of preventing the fan from reversing. The anti-rotation brake seat 2 added to the fan main shaft 1 is used to receive the anti-torsion force of the anti-rotation brake disc 3, which can reduce the wear on the fan main shaft 1. At the same time, the axial anti-reversal method of the anti-rotation brake disc 3 can increase the layout area of ​​the annular anti-slip brake pad 4 and prevent the fan main shaft 1 from being squeezed in the vertical direction. When replacing the annular anti-slip brake pad 4, the anti-rotation brake disc 3 can be controlled to stay away from the anti-rotation brake seat 2 and provide an open annular anti-slip brake pad 4 replacement operation space.

[0033] What is described above is only a preferred specific implementation manner 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 within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fan anti-reverse device, comprising a fan main shaft (1) fixed to a motor shaft, characterized in that: An anti-reversal mechanism is arranged outside the main rotating shaft (1) of the fan, and the anti-reversal mechanism comprises an anti-rotation brake seat (2), an anti-rotation brake disc (3) and an annular anti-slip brake pad (4); the anti-rotation brake seat (2) is sleeved on the surface of the main rotating shaft (1) of the fan, the anti-rotation brake disc (3) is arranged on one side of the anti-rotation brake seat (2), and the annular anti-slip brake pad (4) is fixed on an end surface of the anti-rotation brake disc (3) opposite to the anti-rotation brake seat (2); a distance adjustment mechanism is arranged below the main rotating shaft (1) of the fan, and the distance adjustment mechanism comprises a position adjustment slide box (5), a position adjustment slider (6) and a position adjustment screw (8); the position adjustment slide box (5) is arranged below the anti-rotation brake disc (3), the position adjustment slider (6) extends out of the slide arm of the position adjustment slide box (5) and is fixed on the lower part of the anti-rotation brake disc (3), and the position adjustment screw (8) is passed through the interior of the position adjustment slide box (5).

2. The fan anti-reversal device according to claim 1, characterized in that: A clearance opening (12) is provided at the center of one end surface of the anti-rotation brake disc (3), and the diameter of the clearance opening (12) is larger than the diameter of the main rotating shaft (1) of the fan.

3. The fan anti-reverse device according to claim 2, characterized in that: A fixing collar (13) is fixed to one end of the anti-rotation brake seat (2) away from the anti-rotation brake disc (3), and the fixing collar (13) is sleeved and fixed on the surface of the main rotating shaft (1) of the fan.

4. The fan anti-reverse device according to claim 3, characterized in that: The anti-rotation brake seat (2) is suspended above the position adjustment slide box (5), and one end of the position adjustment slide box (5) is fixed on the fan housing.

5. The fan anti-reversal device according to claim 4, characterized in that: The upper end surface of the position adjustment slide box (5) is provided with a position adjustment sliding opening (10), and the sliding arm of the position adjustment sliding block (6) is slidably connected to the position adjustment sliding opening (10) of the position adjustment slide box (5).

6. The fan anti-reversal device according to claim 5, characterized in that: A positioning screw hole (11) is provided at the center of one side surface of the positioning slide block (6), and the positioning screw rod (8) is threadedly connected to the positioning screw hole (11) of the positioning slide block (6).

7. The fan anti-reverse device according to claim 6, characterized in that: A driving motor (7) is fixed to the inner wall of the position adjustment slide box (5), and an output shaft of the driving motor (7) is fixed to one end of the position adjustment screw rod (8).

8. The fan anti-reversal device according to claim 7, characterized in that: A rotating bearing (9) is embedded and fixed in an inner wall of one side of the position adjustment slide box (5), and one end of the position adjustment screw rod (8) away from the driving motor (7) is arranged at the rotating bearing (9).

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