Brake device for preventing reverse rotation of centrifugal fan

Abstract

The utility model discloses a brake device for preventing a centrifugal fan from rotating reversely. The brake device comprises a brake inclined plate, a wear-resistant rubber layer, rollers, a base, a pull ring and a pull rope. The brake inclined plate is arranged between a centrifugal fan and a driving motor, the top face of the brake inclined plate is arranged downwards in an inclined mode in the direction of a rotating shaft of the centrifugal fan, and the wear-resisting rubber layer matched with the rotating shaft of the centrifugal fan is arranged on the top face of the brake inclined plate. The rollers are arranged at the lower end of the brake inclined plate and are supported on the base; the pull ring is arranged at the end, away from a rotating shaft of the centrifugal fan, of the brake inclined plate, and one end of the pull rope is fixed to the pull ring. The problem that in the prior art, a standby fan rotates reversely is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of brake devices, and in particular relates to a brake device for preventing a centrifugal fan from rotating in the reverse direction. Background Art

[0002] Centrifugal fans use high-speed rotating impellers to accelerate the gas, then decelerate and change the flow direction, so that kinetic energy is converted into potential energy. In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to the radial direction when passing through the impeller, and then enters the diffuser. In the diffuser, the gas changes the flow direction and the cross-sectional area of ​​the pipe increases, which slows down the airflow. This deceleration effect converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller, and secondly in the expansion process. In a multi-stage centrifugal fan, a return flow device is used to allow the airflow to enter the next impeller, generating higher pressure.

[0003] Since centrifugal fans are widely used in the chemical and thermal power generation industries, and most centrifugal fans are connected in parallel with one in operation and one in standby. During the maintenance and standby period of the standby fan, the outlet door and check valve of the normally operating centrifugal fan are not tightly sealed, causing the standby fan to rotate in the opposite direction, which in turn leads to the problem that the standby fan cannot be properly maintained and the equipment cannot be started normally after maintenance. At present, the fan rotating in the opposite direction is braked manually through sleepers, but manual braking is difficult and dangerous, which has a great impact on normal production operation and maintenance of centrifugal fans. Utility Model Content

[0004] The embodiment of the present application solves the problem of reverse rotation of the standby fan in the prior art by providing a braking device for preventing the centrifugal fan from rotating in reverse.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a braking device for preventing the reverse rotation of a centrifugal fan, including a brake ramp, a wear-resistant rubber layer, a roller, a base, a pull ring and a pull rope;

[0006] The brake ramp is arranged between the centrifugal fan and the driving motor, the top surface of the brake ramp is arranged downwardly and tilted toward the direction of the rotating shaft of the centrifugal fan, and the top surface of the brake ramp is provided with the wear-resistant rubber layer matched with the rotating shaft of the centrifugal fan;

[0007] The lower end of the brake ramp is provided with the roller, and the roller is supported on the base;

[0008] The pull ring is arranged at one end of the brake ramp away from the rotating shaft of the centrifugal fan, and one end of the pull rope is fixed on the pull ring.

[0009] In a possible implementation, the number of the rollers is four, and the four rollers are arranged in the circumference of the brake ramp.

[0010] In a possible implementation, a mounting groove is provided at the lower end of the brake ramp, a sliding block is slidably installed in the mounting groove, and a compression spring is provided between the upper end of the sliding block and the bottom wall of the mounting groove;

[0011] The roller is arranged at the lower end of the sliding block.

[0012] In a possible implementation, when the wear-resistant rubber layer abuts against the rotating shaft of the centrifugal fan, the roller is located in the mounting groove, and the bottom surface of the brake ramp abuts against the base.

[0013] In a possible implementation, a safety hook is provided at the other end of the pull rope, and a first locking ring and a second locking ring matching the safety hook are provided at intervals on the base;

[0014] When the safety hook is connected to the first locking ring, the distance between the wear-resistant rubber layer and the rotating shaft of the centrifugal fan is more than 5 cm;

[0015] When the safety hook is connected to the second locking ring, the wear-resistant rubber layer is in contact with the rotating shaft of the centrifugal fan.

[0016] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0017] The embodiment of the utility model provides a braking device for preventing the reverse rotation of a centrifugal fan. During the overhaul and standby of the centrifugal equipment, the brake ramp is slid into the lower part of the rotating shaft of the centrifugal fan through the roller, so that the wear-resistant rubber is in close contact with the rotating shaft of the centrifugal fan. When the rotating shaft of the centrifugal fan tends to rotate in the reverse direction, the brake ramp is forced to be further inserted into the space between the rotating shaft of the centrifugal fan and the base, thereby braking the rotating shaft of the centrifugal fan. At the same time, the wear-resistant rubber can protect the rotating shaft of the centrifugal fan from wear. When the centrifugal fan is started, the rotating shaft of the centrifugal fan rotates forward, so that the brake ramp automatically slides out under the action of friction. When the device is not in use, the position of the device can be fixed by a pull rope. The device solves the problem that the standby fan cannot be properly overhauled due to the reverse rotation of the standby fan and the equipment cannot be started normally after the overhaul. At the same time, there is no need to manually brake the fan rotating in the reverse direction through sleepers, which is difficult to brake and has certain dangers. The device has a simple structure and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the installation of a braking device for preventing a centrifugal fan from rotating in the reverse direction provided in an embodiment of the utility model.

[0020] Figure 2 A schematic diagram of the structure of a braking device for preventing a centrifugal fan from rotating in reverse provided in Embodiment 1 of the utility model.

[0021] Figure 3 A schematic diagram of the structure of a braking device for preventing a centrifugal fan from rotating in reverse provided in Embodiment 2 of the utility model.

[0022] Figure numerals: 1-brake ramp; 2-centrifugal fan; 3-drive motor; 4-wear-resistant rubber layer; 5-roller; 6-base; 7-pull ring; 8-pull rope; 9-installation groove; 10-sliding block; 11-compression spring; 12-safety hook; 13-first locking ring; 14-second locking ring; 15-vertical plate; 16-electromagnet. DETAILED DESCRIPTION

[0023] 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 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.

[0024] In the description of the embodiments of the present utility model, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances.

[0025] like Figures 1 to 3 As shown, the braking device for preventing the centrifugal fan from rotating in the reverse direction provided by the embodiment of the utility model comprises a braking ramp 1, a wear-resistant rubber layer 4, a roller 5, a base 6, a pull ring 7 and a pull rope 8.

[0026] The brake ramp 1 is arranged between the centrifugal fan 2 and the drive motor 3. The top surface of the brake ramp 1 is inclined downward toward the rotating axis of the centrifugal fan 2. The top surface of the brake ramp 1 is provided with a wear-resistant rubber layer 4 that matches the rotating axis of the centrifugal fan 2.

[0027] A roller 5 is provided at the lower end of the brake ramp 1 , and the roller 5 is supported on a base 6 .

[0028] A pull ring 7 is provided at one end of the brake ramp 1 away from the rotating shaft of the centrifugal fan 2 , and one end of a pull rope 8 is fixed to the pull ring 7 .

[0029] It should be noted that the brake ramp 1 is a wedge-shaped structure, welded by stainless steel plates, and the wear-resistant rubber layer 4 is bonded to the brake ramp 1. The wear-resistant rubber layer 4 is used to increase the friction between the brake ramp 1 and the rotating shaft of the centrifugal fan 2, and at the same time protect the rotating shaft of the centrifugal fan 2 from wear. The drive motor 3 is installed on the base 6.

[0030] During the maintenance and standby of the centrifugal equipment, the brake ramp 1 is slid into the lower part of the rotating shaft of the centrifugal fan 2 through the roller 5, so that the wear-resistant rubber layer 4 is in close contact with the rotating shaft of the centrifugal fan 2. When the rotating shaft of the centrifugal fan 2 tends to rotate in the opposite direction, the brake ramp 1 is forced to be further inserted into the space between the rotating shaft of the centrifugal fan 2 and the base 6, thereby braking the rotating shaft of the centrifugal fan 2. At the same time, the wear-resistant rubber layer 4 can protect the rotating shaft of the centrifugal fan 2 from wear. When the centrifugal fan 2 is started, the rotating shaft of the centrifugal fan 2 rotates forward, so that the brake ramp 1 automatically slides out under the action of friction. When the device is not in use, the position of the device can be fixed by the pull rope 8. The device solves the problem that the standby fan cannot be properly maintained and the equipment cannot be started after maintenance due to the reverse rotation of the standby fan. At the same time, there is no need to manually brake the fan rotating in the opposite direction through the sleepers, which is difficult to brake and has certain dangers. The device has a simple structure and strong practicality.

[0031] In this embodiment, the number of the rollers 5 is four, and the four rollers 5 are arranged in the circumferential direction of the brake ramp 1 .

[0032] It should be noted that the four rollers 5 slide smoothly.

[0033] In this embodiment, a mounting groove 9 is provided at the lower end of the brake ramp 1 , a sliding block 10 is slidably installed in the mounting groove 9 , and a compression spring 11 is provided between the upper end of the sliding block 10 and the bottom wall of the mounting groove 9 .

[0034] A roller 5 is disposed at the lower end of the sliding block 10 .

[0035] It should be noted that the roller 5 that can move up and down a certain distance can make the brake ramp 1 and the rotating shaft of the centrifugal fan 2 contact more closely.

[0036] In this embodiment, when the wear-resistant rubber layer 4 abuts against the rotating shaft of the centrifugal fan 2 , the roller 5 is located in the mounting groove 9 , and the bottom surface of the brake ramp 1 abuts against the base 6 .

[0037] It should be noted that the bottom surface of the brake ramp 1 abuts against the base 6, so that the brake ramp 1 is not easy to loosen, thereby improving the braking effect.

[0038] In the first embodiment, a safety hook 12 is disposed at the other end of the pull rope 8 , and a first locking ring 13 and a second locking ring 14 matching the safety hook 12 are disposed on the base 6 at intervals.

[0039] When the safety hook 12 is connected to the first locking ring 13, the distance between the wear-resistant rubber layer 4 and the rotating shaft of the centrifugal fan 2 is more than 5 cm.

[0040] When the safety hook 12 and the second locking ring 14 are connected, the wear-resistant rubber layer 4 and the rotating shaft of the centrifugal fan 2 are in contact.

[0041] It should be noted that when the device is not in use, the safety hook 12 and the first locking ring 13 are connected to prevent the brake ramp 1 from being lost or prevent the brake ramp 1 from moving to the rotating shaft of the centrifugal fan 2 .

[0042] When the device is used, the safety hook 12 is connected to the second locking ring 14 to prevent the brake ramp 1 from flying out and injuring people. This embodiment adopts a manual control mode, which is safe and reliable during control.

[0043] In the second embodiment, the pull ring 7 is located in the groove of the brake ramp 1, and the other end of the pull rope 8 is fixed on the vertical plate 15. The vertical plate 15 is located on the side of the brake ramp 1 away from the rotating shaft of the centrifugal fan 2, and an electromagnet 16 is provided on the vertical plate 15.

[0044] It should be noted that the base 6 has a certain slope. When the centrifugal fan 2 is running, the electromagnet 16 is energized, and the electromagnet 16 adsorbs the brake ramp 1. When the centrifugal equipment needs to be repaired or put on standby, the electromagnet 16 is powered off, and the brake ramp 1 slides toward the rotating shaft of the centrifugal fan 2 under the action of gravity until the brake ramp 1 is inserted into the space between the rotating shaft of the centrifugal fan 2 and the base 6, thereby braking the rotating shaft of the centrifugal fan 2. When the centrifugal equipment needs to be activated, the electromagnet 16 is energized, and the brake ramp 1 automatically slides out under the action of friction and moves to the vertical plate 15, and the electromagnet 16 adsorbs the brake ramp 1. This embodiment adopts an automatic control method to reduce the workload of the staff.

[0045] In this embodiment, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiment, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiment should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A braking device for preventing a centrifugal fan from rotating in the reverse direction, characterized in that: It comprises a brake ramp (1), a wear-resistant rubber layer (4), a roller (5), a base (6), a pull ring (7) and a pull rope (8); The brake ramp (1) is arranged between the centrifugal fan (2) and the drive motor (3), the top surface of the brake ramp (1) is arranged to be inclined downward in the direction of the rotation axis of the centrifugal fan (2), and the top surface of the brake ramp (1) is provided with the wear-resistant rubber layer (4) that matches the rotation axis of the centrifugal fan (2); The lower end of the brake ramp (1) is provided with the roller (5), and the roller (5) is supported on the base (6); The pull ring (7) is provided at one end of the brake ramp (1) away from the rotating shaft of the centrifugal fan (2), and one end of the pull rope (8) is fixed to the pull ring (7).

2. The braking device for preventing the centrifugal fan from rotating in reverse according to claim 1, characterized in that: The number of the rollers (5) is four, and the four rollers (5) are arranged in the circumferential direction of the brake ramp (1).

3. The braking device for preventing the centrifugal fan from rotating in reverse according to claim 1, characterized in that: The lower end of the brake ramp (1) is provided with a mounting groove (9), a sliding block (10) is slidably mounted in the mounting groove (9), and a compression spring (11) is provided between the upper end of the sliding block (10) and the bottom wall of the mounting groove (9); The roller (5) is arranged at the lower end of the sliding block (10).

4. The braking device for preventing the centrifugal fan from rotating in reverse according to claim 3, characterized in that: When the wear-resistant rubber layer (4) abuts against the rotating shaft of the centrifugal fan (2), the roller (5) is located in the mounting groove (9), and the bottom surface of the brake ramp (1) abuts against the base (6).

5. The braking device for preventing the centrifugal fan from rotating in reverse according to claim 1, characterized in that: The other end of the pull rope (8) is provided with a safety hook (12), and the base (6) is provided with a first locking ring (13) and a second locking ring (14) matching with the safety hook (12) at intervals; When the safety hook (12) and the first locking ring (13) are connected, the distance between the wear-resistant rubber layer (4) and the rotating shaft of the centrifugal fan (2) is greater than 5 cm; When the safety hook (12) and the second locking ring (14) are connected, the wear-resistant rubber layer (4) is in contact with the rotating shaft of the centrifugal fan (2).

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