Closed circulating water cooling tower fan with brake for preventing reversion

Abstract

The utility model discloses an anti-reversion closed circulating water cooling tower fan with a brake, which relates to the technical field of industrial fan equipment control and comprises a fan motor, a first coupling flange, a transmission shaft, a second coupling flange, a speed reducer, a fan impeller and the brake. An output shaft of the fan motor is connected with the transmission shaft through a first coupler flange, the transmission shaft is connected with the input end of the speed reducer through a second coupler flange, and the output end of the speed reducer is connected with the fan impeller. The brake is assembled on the first coupler flange, the braking end of the brake is in movable contact with the first coupler flange, and the brake tightly holds the first coupler flange in a delayed mode after the fan motor is powered off. Under the condition that the equipment operation foundation is not changed, the first coupler flange is tightly held by the brake, and the fan blades are prevented from rotating reversely; the time-delay relay is used to ensure that the fan coupling flange is reduced in abrasion; when the fan is in a stop state, the fan blades are not reversed and are kept in a static state at any time.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial fan equipment control, and more specifically to a closed-circuit circulating water cooling tower fan with a brake to prevent reverse rotation. Background Technique

[0002] When the closed-circuit circulating water cooling tower fan is in a stopped state, a negative pressure is formed in the closed cooling tower under the influence of other operating fans, causing the fan blades to rotate rapidly in reverse. Since the current circulating water system uses an automatic program that starts and stops the fan according to the water temperature, if the fan blades are in a reverse rotation state at the moment of starting the fan, it will cause a great impact on the reduction gears of the speed reducer, easily resulting in equipment damage.

[0003] In the prior art, the patent with the publication number CN218454830U discloses a cooling tower fan that can prevent reverse rotation of the fan. It relates to the technical field of cooling tower fans and includes a fan unit. The fan unit includes a fan motor, a coupling, a transmission shaft, a reduction mechanism, a fan impeller, a one-way bearing, and a bearing seat; the output end of the fan motor is connected to the coupling, the coupling is detachably arranged and connected to the transmission shaft, the transmission shaft passes through the one-way bearing and is connected to the input end of the reduction mechanism, the one-way bearing is installed on the bearing seat, and the output end of the reduction mechanism is connected to the fan impeller. The transmission shaft can only rotate in one direction within the one-way bearing, that is, it can only rotate in one direction, namely the direction of the normal rotation of the fan, preventing the reverse rotation of the fan. When the fan is installed and maintained, the coupling is first disconnected, and then the forward and reverse rotation debugging of the fan motor is carried out, preventing the damage of the one-way bearing and the fan motor caused by the one-way bearing restricting its rotation during the reverse rotation debugging of the fan motor, and extending the service life of the fan motor.

[0004] For the cooling tower fan disclosed in the above patent, when the fan is installed and maintained, it is necessary to disconnect the coupling, and the operation is relatively troublesome, time-consuming and laborious.

[0005] The patent with the publication number CN216478048U discloses a device for preventing the fan from reversing due to airflow backflow, including a support frame, a fixed clamp, a ratchet, a ratchet tongue and an electromagnet suction cup. A slot is provided on the ratchet, one end of the ratchet tongue is provided with a limit end that matches the slot, and the other end of the ratchet tongue is rotatably installed in the groove of the fixed clamp. The terminal of the electromagnet suction cup is connected in parallel with the terminal of the motor driving the fan. When the motor is powered on, the electromagnet suction cup is powered on and adsorbs the ratchet tongue to make it in the release position. The limit end of the ratchet tongue is away from the slot and does not limit the rotation of the fan; when the motor is powered off, the electromagnet suction cup gradually loses its magnetism, and the ratchet tongue is in the limit position due to its own gravity. The limit end of the ratchet tongue matches the slot to lock the main shaft. This scheme adds a simple anti-reversal device to the fan shaft system through optimized design, which can effectively ensure the long-term safe operation of the fan equipment, and has the advantages of simple and light structure and small space occupation.

[0006] The device disclosed in the above patent has a clamping position set on the shaft. For a closed-loop water cooling tower fan, without changing the existing equipment, if the clamping position is set on the transmission shaft, the transmission shaft is made of carbon fiber lightweight material. If the brake is set on it, the carbon fiber lightweight material transmission shaft will bear a relatively large force, and the transmission shaft is easily damaged in long-term use. Utility Model Content

[0007] In order to overcome the defects existing in the above-mentioned prior art, the purpose of the utility model is to provide a closed-circulation water cooling tower fan with a brake to prevent reverse rotation, so as to solve the problems existing in the above-mentioned prior art such as cumbersome operation and easy damage to the transmission shaft.

[0008] In order to achieve the above objectives, the technical solution adopted by the utility model is:

[0009] A closed-circulation water cooling tower fan with a brake to prevent reverse rotation, comprising a fan motor, a first coupling flange, a transmission shaft, a second coupling flange, a reducer, a fan impeller and a brake;

[0010] The output shaft of the fan motor is connected to the transmission shaft through a first coupling flange, the transmission shaft is connected to the input end of the reducer through a second coupling flange, and the output end of the reducer is connected to the fan impeller;

[0011] The brake is mounted on the first coupling flange, and the brake end thereof is in active contact with the first coupling flange. After the fan motor is powered off, the brake holds the first coupling flange for a delayed period of time to prevent the fan impeller from reversing.

[0012] Preferably, the brake comprises a bracket, a cylinder, a connecting rod mechanism and a brake mechanism;

[0013] The oil cylinder, the connecting rod mechanism and the braking mechanism are all assembled on the bracket. The output end of the oil cylinder is connected to the connecting rod mechanism, the connecting rod mechanism is connected to the braking mechanism, a flange braking space is arranged in the braking mechanism, the first coupling flange is located in the flange braking space, and the oil cylinder drives the connecting rod mechanism to reduce or increase the flange braking space in the braking mechanism, so as to clamp or loosen the first coupling flange in the flange braking space.

[0014] Preferably, the braking mechanism includes a first braking vertical rod, a second braking vertical rod, a first braking shoe and a second braking shoe;

[0015] The connecting rod mechanism is connected to the first braking vertical rod and the second braking vertical rod. The first braking vertical rod and the second braking vertical rod are arranged in parallel and can move relatively. The first braking shoe and the second braking shoe are respectively arranged on the inner sides of the first braking vertical rod and the second braking vertical rod. A flange braking space is formed between the first braking shoe and the second braking shoe, and the first coupling flange is located in the flange braking space;

[0016] The oil cylinder drives the connecting rod mechanism to move, drives the first braking vertical rod and the second braking vertical rod to move in opposite directions, and the first braking shoe and the second braking shoe clamp or loosen the first coupling flange in the flange braking space.

[0017] Preferably, a time delay relay is further included, and the time delay relay is electrically connected to the fan motor and the brake.

[0018] Preferably, the speed reducer is a gear speed reducer.

[0019] Preferably, the gear speed reducer includes a housing, an input shaft, an intermediate shaft, an output shaft, a driving bevel gear, a driven bevel gear, a small gear and a large gear;

[0020] The input shaft penetrates into the housing, and the driving bevel gear is assembled at its end; the intermediate shaft is arranged in the housing, and the driven bevel gear and the small gear are assembled on it, and the driven bevel gear meshes with the driving bevel gear; the output shaft is parallel to the intermediate shaft, the output shaft penetrates out of the housing, and the large gear is assembled at its first end, and the large gear meshes with the small gear.

[0021] Preferably, bearings are assembled at both ends of the input shaft, both ends of the intermediate shaft and both ends of the output shaft; oil seals are assembled at the part where the input shaft penetrates into the housing and the part where the output shaft penetrates out of the housing. An O-ring is also assembled at the part where the output shaft penetrates out of the housing, and an air filter is also arranged on the housing.

[0022] Preferably, an oil pipe, an oil level gauge and an oil filling pipe are further included; the oil pipe is connected to the speed reducer, and the oil level gauge and the oil filling pipe are both arranged on the oil pipe.

[0023] Preferably, the transmission shaft is made of carbon fiber lightweight material, and the first coupling flange and the second coupling flange are both made of iron material.

[0024] Advantages of the present utility model:

[0025] The closed-circuit circulating water cooling tower fan with a brake to prevent reverse rotation provided by the present utility model, without changing the basis of equipment operation, uses a brake to hold the first coupling flange to prevent the wind blade from reversing; uses a time-delay relay to ensure that the coupling flange of the fan is less worn; when the fan is in a stopped state, the wind blade does not reverse and remains stationary at any time; reduces the strong impact brought during equipment startup and extends the service life of the equipment; during maintenance and repair, the fan is in a stationary state, and there is no need to power off again after jogging to stop (jogging to stop will also generate an impact); realizes self-separation during startup and self-locking during power-off, realizes automated operation, and ensures safe access to the cooling tower during inspection and maintenance; the equipment has a longer service life, reduces the procurement of spare parts, and makes the equipment operate more smoothly and reduces inspection and maintenance. Description of the drawings

[0026] Figure 1 Schematic diagram of the closed-circuit circulating water cooling tower fan with a brake to prevent reverse rotation of the present utility model;

[0027] Figure 2 Schematic diagram of the brake of the present utility model;

[0028] Figure 3 Schematic diagram of the speed reducer of the present utility model;

[0029] Figure 4 Schematic diagram of the circuit control logic of the present utility model;

[0030] Reference numerals:

[0031] 1. Fan motor; 2. First coupling flange; 3. Transmission shaft; 4. Second coupling flange; 5. Speed reducer; 501. Housing; 502. Input shaft; 503. Intermediate shaft; 504. Output shaft; 505. Driving bevel gear; 506. Driven bevel gear; 507. Small gear; 508. Large gear; 509. Bearing; 510. Oil seal; 511. O-ring; 512. Air filter; 6. Fan impeller; 7. Brake; 71. Oil cylinder; 72. Link mechanism; 73. First braking vertical rod; 74. Second braking vertical rod; 75. First braking shoe; 76. Second braking shoe; 8. Oil pipe; 9. Oil level gauge; 10. Refueling pipe. Specific embodiments

[0032] The following will clearly and completely describe the concept, specific structure and technical effects generated by the present utility model in combination with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present utility model.

[0033] Example 1

[0034] A closed-loop water cooling tower fan with a brake to prevent reverse rotation, such as Figure 1 As shown, it includes a fan motor 1, a first coupling flange 2, a transmission shaft 3, a second coupling flange 4, a reducer 5, a fan impeller 6 and a brake 7;

[0035] The output shaft of the fan motor 1 is connected to the transmission shaft 3 through the first coupling flange 2, the transmission shaft 3 is connected to the input end of the reducer 5 through the second coupling flange 4, and the output end of the reducer 5 is connected to the fan impeller 6;

[0036] The brake 7 is assembled on the first coupling flange 2, and its braking end is in active contact with the first coupling flange 2. After the fan motor 1 is powered off, it delays and holds the first coupling flange 2 to prevent the fan impeller 6 from reversing.

[0037] In this embodiment, when in use, the fan motor 1 rotates, and the high-speed rotation is transmitted to the reducer 5 through the first coupling flange 2, the transmission shaft 3, and the second coupling flange 4. The reducer 5 slows down the high-speed rotation, and then drives the fan impeller 6 and the blades thereon to rotate, thereby realizing the operation of the closed-loop water cooling tower fan.

[0038] In this embodiment, by providing a brake 7, when the fan stops, the brake 7 is used to clamp the first coupling flange 2 to prevent the fan impeller 6 from reversing, keep the fan impeller 6 stationary, and prevent the fan impeller 6 from causing a strong impact on the gears during startup due to the reversal of the fan impeller 6, thereby extending the service life of the equipment.

[0039] When installing and repairing the fan, there is no need to disconnect the coupling. The fan is in a stationary state and there is no need to shut down the fan and then cut off the power again.

[0040] The brake 7 is clamped and braked at the first coupling flange 2. The first coupling flange 2 is made of iron and can withstand a large clamping force without being easily damaged.

[0041] The material of the first coupling flange 2 is an ordinary flange and is not wear-resistant, so a delay is added to the brake 7 to reduce the wear of the coupling flange by the brake 7 due to excessive speed when the fan stops. When the fan motor 1 is powered off, the first coupling flange 2 slows down from high speed and stops rotating at zero speed, the brake 7 will hold the first coupling flange 2 to prevent the fan impeller 6 from reversing, and prevent the first coupling flange 2 from being worn by the brake 7 during the deceleration process, thereby extending the service life of the first coupling flange 2 and the brake 7.

[0042] In this embodiment, in principle, the braking position of the brake 7 can be set at the position of the first coupling flange 2 or the second coupling flange 4. However, since the second coupling flange 4 is close to the fan impeller 6, the fan impeller 6 will interfere with the brake 7 installed on the second coupling flange 4. While the first coupling flange 2 is far from the fan impeller 6, the fan impeller 6 will not interfere with the brake 7 installed on the first coupling flange 2. Therefore, in this embodiment, the brake 7 is selected to be installed at the position of the first coupling flange 2.

[0043] Embodiment 2

[0044] This embodiment is further elaborated on the basis of Embodiment 1, as Figure 2 shown, the brake 7 includes a bracket, an oil cylinder 71, a linkage mechanism 72, and a braking mechanism;

[0045] The oil cylinder 71, the linkage mechanism 72, and the braking mechanism are all assembled on the bracket. The output end of the oil cylinder 71 is connected to the linkage mechanism 72, the linkage mechanism 72 is connected to the braking mechanism, a flange braking space is provided inside the braking mechanism, the first coupling flange 2 is located inside the flange braking space, and the oil cylinder 71 drives the flange braking space inside the braking mechanism to shrink or expand, so as to clamp or release the first coupling flange 2 inside the flange braking space.

[0046] As Figure 2 shown, specifically, the braking mechanism includes a first braking vertical rod 73, a second braking vertical rod 74, a first braking shoe 75, and a second braking shoe 76;

[0047] The linkage mechanism 72 is connected to the first braking vertical rod 73 and the second braking vertical rod 74. The first braking vertical rod 73 and the second braking vertical rod 74 are arranged in parallel and can move relative to each other. The first braking shoe 75 and the second braking shoe 76 are respectively arranged on the inner sides of the first braking vertical rod 73 and the second braking vertical rod 74. A flange braking space is formed between the first braking shoe 75 and the second braking shoe 76, and the first coupling flange 2 is located inside the flange braking space;

[0048] The oil cylinder 71 drives the linkage mechanism 72 to move, driving the first braking vertical rod 73 and the second braking vertical rod 74 to move in opposite directions, and the first braking shoe 75 and the second braking shoe 76 clamp or release the first coupling flange 2 inside the flange braking space.

[0049] In this embodiment, the brake 7 is a wheel-type brake, its driving part is the oil cylinder 71, the oil cylinder 71 outputs a reciprocating linear motion, and drives the linkage mechanism 72 to move. As Figure 2As shown, when the linkage mechanism 72 drives the first brake vertical rod 73 and the second brake vertical rod 74 to move inwards, the first brake shoe 75 and the second brake shoe 76 clamp the first coupling flange 2 within the flange braking space; when the linkage mechanism 72 drives the first brake vertical rod 73 and the second brake vertical rod 74 to move outwards, the first brake shoe 75 and the second brake shoe 76 release the first coupling flange 2 within the flange braking space.

[0050] Embodiment 3

[0051] This embodiment is further elaborated on the basis of Embodiment 2 and further includes a time-delay relay, which is electrically connected to the fan motor 1 and the brake 7.

[0052] In this embodiment, the material of the first coupling flange 2 belongs to a common flange and is not wear-resistant. Therefore, a time-delay relay is added to the brake 7 to reduce the wear of the coupling flange by the brake 7 when the fan stops with too high a speed. After the fan motor 1 is powered off, the first coupling flange 2 decelerates from high-speed rotation and stops rotating when the speed is zero, and then the brake 7 clamps the first coupling flange 2 to prevent the fan impeller 6 from reversing, preventing the brake 7 from wearing the first coupling flange 2 during the deceleration process, and extending the service life of the first coupling flange 2 and the brake 7.

[0053] The time-delay relay is electrically connected to the fan motor 1 and the brake 7. That is, after the fan motor 1 is powered off, the time-delay relay is activated, and after the delay time arrives, the brake 7 is activated to clamp the first coupling flange 2 for braking. After testing, it takes about 25 s for the fan motor 1 to power off and stop rotating. By adding a time-delay relay and adjusting the delay of the brake cylinder 71 to 25 s before starting, the coupling flange can be clamped just at the moment when the fan blades reverse to achieve a perfect match.

[0054] As Figure 4 shown, it is a circuit control logic diagram, and its control logic is as follows:

[0055] 1. The auxiliary contact of the main fan closes simultaneously when the fan starts, enabling the brake coil -KM1a to be energized and self-locked, the brake is released, and the brake operation indicator light (-HR1a) is on.

[0056] 2. When the fan stops, since the main fan contactor is disconnected, at this time the power-off time-delay contact (-KT1a) starts timing. After the timing is up, the -KTla contact disconnects, the brake coil -KM1a loses power, and braking is performed, and the brake stop indicator light (-HG1a) is on.

[0057] In this embodiment, when the fan starts and runs, the brake 7 is released and does not clamp the coupling flange; after the fan motor 1 is powered off, the coupling flange is locked with a time delay by using the time-delay relay to achieve automated operation and ensure safe access to the cooling tower during inspection and maintenance.

[0058] Example 4

[0059] This example is further elaborated on the basis of Example 3. The speed reducer 5 is a gear speed reducer. As Figure 3 shown, the gear speed reducer includes a housing 501, an input shaft 502, an intermediate shaft 503, an output shaft 504, a driving bevel gear 505, a driven bevel gear 506, a small gear 507, and a large gear 508;

[0060] The input shaft 502 penetrates into the housing 501, and a driving bevel gear 505 is assembled at its end; the intermediate shaft 503 is arranged in the housing 501, and a driven bevel gear 506 and a small gear 507 are assembled thereon. The driven bevel gear 506 meshes with the driving bevel gear 505; the output shaft 504 is parallel to the intermediate shaft 503. The output shaft 504 penetrates out of the housing 501, and a large gear 508 is assembled at its first end. The large gear 508 meshes with the small gear 507.

[0061] In this example, the input shaft 502 rotates at a high speed. The rotation is decelerated once through the driving bevel gear 505 and the driven bevel gear 506 to drive the intermediate shaft 503 to rotate; then the rotation is decelerated twice through the small gear 507 and the large gear 508 to drive the output shaft 504 to rotate at a low speed. The output shaft 504 then drives the fan impeller 6 and the blades thereon to rotate at a low speed.

[0062] As Figure 3 shown, bearings 509 are assembled at both ends of the input shaft 502, both ends of the intermediate shaft 503, and both ends of the output shaft 504 to enable the shafts to rotate smoothly; oil seals 510 are assembled at the part where the input shaft 502 penetrates into the housing 501 and the part where the output shaft 504 penetrates out of the housing 501 to seal the lubricating oil and prevent it from flowing outwards; an O-ring 511 is also assembled at the part where the output shaft 504 penetrates out of the housing 501 for sealing, and an air filter 512 is also arranged on the housing 501 to filter the air entering the housing 501.

[0063] As Figure 1 shown, it further includes an oil pipe 8, an oil level gauge 9, and an oil filling pipe 10; the oil pipe 8 is connected to the speed reducer 5, and both the oil level gauge 9 and the oil filling pipe 10 are arranged on the oil pipe 8. The oil pipe 8 is used to add lubricating oil to the speed reducer 5; the oil level gauge 9 is used to display the amount of lubricating oil in the oil pipe 8; the oil filling pipe 10 is used to add oil to the oil pipe 8.

[0064] In this example, the transmission shaft 3 is made of carbon fiber lightweight material, and both the first coupling flange 2 and the second coupling flange 4 are made of iron material.

[0065] The above has specifically described the embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can also make various equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalents or substitutions are all included within the scope defined by the claims of the present utility model.

Claims

1. A closed-loop water cooling tower fan with a brake to prevent reverse rotation, characterized in that: It comprises a fan motor (1), a first coupling flange (2), a transmission shaft (3), a second coupling flange (4), a reducer (5), a fan impeller (6) and a brake (7); The output shaft of the fan motor (1) is connected to the transmission shaft (3) via a first coupling flange (2), the transmission shaft (3) is connected to the input end of the reducer (5) via a second coupling flange (4), and the output end of the reducer (5) is connected to the fan impeller (6); The brake (7) is mounted on the first coupling flange (2), and its brake end is in active contact with the first coupling flange (2). After the fan motor (1) is powered off, it holds the first coupling flange (2) for a delayed period of time to prevent the fan impeller (6) from reversing.

2. The closed-loop water cooling tower fan according to claim 1, characterized in that: The brake (7) comprises a bracket, a cylinder (71), a connecting rod mechanism (72) and a brake mechanism; The oil cylinder (71), the connecting rod mechanism (72) and the brake mechanism are all assembled on the bracket; the output end of the oil cylinder (71) is connected to the connecting rod mechanism (72); the connecting rod mechanism (72) is connected to the brake mechanism; a flange brake space is provided in the brake mechanism; the first coupling flange (2) is located in the flange brake space; the oil cylinder (71) drives the flange brake space in the brake mechanism to shrink or enlarge through the connecting rod mechanism (72), and tightens or loosens the first coupling flange (2) in the flange brake space.

3. The closed-loop water cooling tower fan according to claim 2, characterized in that: The brake mechanism comprises a first brake vertical rod (73), a second brake vertical rod (74), a first brake shoe (75) and a second brake shoe (76); The connecting rod mechanism (72) connects the first brake vertical rod (73) and the second brake vertical rod (74); the first brake vertical rod (73) and the second brake vertical rod (74) are arranged in parallel and can move relative to each other; the first brake shoe (75) and the second brake shoe (76) are arranged inside the first brake vertical rod (73) and the second brake vertical rod (74), respectively; a flange brake space is formed between the first brake shoe (75) and the second brake shoe (76); and the first coupling flange (2) is located in the flange brake space; The oil cylinder (71) drives the connecting rod mechanism (72) to move, thereby driving the first brake vertical rod (73) and the second brake vertical rod (74) to move in opposite directions, and the first brake shoe (75) and the second brake shoe (76) to clamp or loosen the first coupling flange (2) in the flange brake space.

4. The closed-loop water cooling tower fan according to claim 1, characterized in that: It also includes a time delay relay, which is electrically connected to the fan motor (1) and the brake (7).

5. The closed-loop water cooling tower fan according to claim 1, characterized in that: The reducer (5) is a gear reducer.

6. The closed-loop water cooling tower fan according to claim 5, characterized in that: The gear reducer comprises a housing (501), an input shaft (502), an intermediate shaft (503), an output shaft (504), a driving bevel gear (505), a driven bevel gear (506), a pinion gear (507) and a large gear (508); The input shaft (502) passes through the housing (501), and the driving bevel gear (505) is assembled on its end; the intermediate shaft (503) is arranged in the housing (501), and the driven bevel gear (506) and the pinion gear (507) are assembled thereon, and the driven bevel gear (506) is meshed with the driving bevel gear (505); the output shaft (504) is parallel to the intermediate shaft (503), and the output shaft (504) passes through the housing (501), and the large gear (508) is assembled on its head end, and the large gear (508) is meshed with the small gear (507).

7. The closed-loop water cooling tower fan according to claim 6, characterized in that: Both ends of the input shaft (502), both ends of the intermediate shaft (503), and both ends of the output shaft (504) are equipped with bearings (509); the part of the input shaft (502) that penetrates into the housing (501) and the part of the output shaft (504) that penetrates out of the housing (501) are equipped with oil seals (510); the part of the output shaft (504) that penetrates out of the housing (501) is also equipped with an O-ring (511); and an air filter (512) is also provided on the housing (501).

8. The closed-loop water cooling tower fan according to claim 1, characterized in that: It also includes an oil pipe (8), an oil mark (9) and a refueling pipe (10); the oil pipe (8) is connected to the reducer (5), and the oil mark (9) and the refueling pipe (10) are both arranged on the oil pipe (8).

9. The closed-loop water cooling tower fan according to claim 1, characterized in that: The transmission shaft (3) is made of a lightweight carbon fiber material, and the first coupling flange (2) and the second coupling flange (4) are both made of iron.

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