Electrically driven fan system for industrial recirculating water cooling towers

Abstract

This utility model discloses an electric-driven fan system for industrial circulating water cooling towers, relating to the field of cooling tower technology. It includes a motor, a fan, an internal reducer, and an external reducer. A drive shaft connects the internal and external reducers, and the drive shaft includes multiple linkage shafts. The innovative structure, with separate layouts for the external and internal reducers, separates the traditional internal two-stage reducer into a high-speed external reducer and a low-speed internal reducer. The auxiliary power provided by the motor first undergoes a first speed reduction through the external reducer, and then the power is transmitted to the internal reducer via the drive shaft for a second speed reduction, ultimately driving the fan to rotate. The multiple linkage shafts reduce the transmission load generated by the external reducer, solving the problems of complex internal structures of reducers in existing traditional electric-driven fan systems for industrial circulating water cooling towers, high speeds at the high-speed end of the reducer leading to easy damage and inconvenient maintenance after damage.

Description

Technical Field

[0001] This utility model relates to the field of cooling tower technology, specifically to an electrically driven fan system for industrial circulating water cooling towers. Background Technology

[0002] Cooling tower fan systems are an important component of industrial cooling towers, widely used in industries such as power, chemical, metallurgy, and petroleum. Their primary function is to remove heat generated by industrial equipment through heat exchange between water and air, maintaining the equipment's normal operating temperature. The main task of a cooling tower fan system is to provide sufficient airflow to facilitate the smooth operation of the heat exchange process.

[0003] Cooling tower fan systems typically consist of fans, motors, transmission devices, and related control and regulation systems.

[0004] Traditional industrial circulating water cooling towers using electrically driven fan systems consist of an external auxiliary motor, an internal two-stage reducer, and a fan. The fan is the core component of the system, typically an axial or centrifugal fan, providing strong airflow to promote air movement and heat exchange. The motor powers the fan, converting electrical energy into mechanical energy through a transmission device (internal two-stage reducer and drive shaft). Existing reducers use a two-stage reduction mechanism: a primary bevel gear drive and a secondary spur gear drive for combined speed reduction. However, the reducer's internal structure is complex, and its high-speed end is prone to damage. Furthermore, the reducer's location within the fan casing makes maintenance inconvenient. Repairs require using a crane to detach the fan, resulting in high costs. To address these issues, an electrically driven fan system for industrial circulating water cooling towers is proposed. Utility Model Content

[0005] The purpose of this invention is to provide an electrically driven fan system for industrial circulating water cooling towers to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an electric drive fan system for industrial circulating water cooling towers, comprising a motor, a fan, a built-in reducer, and an external reducer;

[0007] Installed inside the cooling tower body, the motor's output shaft is connected to an external reducer, and the fan's rotating shaft is connected to an internal reducer;

[0008] The drive shaft connects the built-in reducer and the external reducer. The drive shaft includes multiple linkage shafts, which are used to reduce the transmission load.

[0009] As a preferred embodiment of this utility model, the output shaft of the motor is fixedly sleeved with a first sprocket, and the internal rotating part of the external reducer is equipped with a second sprocket that meshes with the first sprocket. The second sprocket is fixedly sleeved at one end of the transmission shaft.

[0010] As a preferred technical solution of this utility model, the fan shaft is fixedly sleeved with a first bevel gear, and a second bevel gear that meshes with the first bevel gear is rotatably installed inside the built-in reducer. The second bevel gear is fixedly sleeved on the other end of the transmission shaft.

[0011] As a preferred technical solution of this utility model, one end of the linkage shaft is connected to two side strips, and the other end is connected to two slide cylinders. One end of the side strip is fixedly connected to a slide rod, and one end of the slide rod is slidably inserted into the slide cylinder of the adjacent linkage shaft. A spring for buffering is sleeved on the outer wall of the slide rod.

[0012] As a preferred technical solution of this utility model, one end of the slide rod is fixedly connected to a limiting block to prevent the slide rod from detaching from the slide cylinder.

[0013] As a preferred technical solution of this utility model, one end of the slide cylinder is provided with a through hole for ventilation.

[0014] As a preferred technical solution of this utility model, a cushioning pad is installed at one end of the inside of the slide cylinder.

[0015] As a preferred technical solution of this utility model, a stabilizing mechanism for stabilizing the connection of two linkage shafts is installed in the main body of the cooling tower. The stabilizing mechanism includes a base and a cover. The base is fixedly installed in the main body of the cooling tower, and the cover is connected to the base by a screw. The cover and the base are combined into a ring structure and are sleeved at the connection of the two linkage shafts.

[0016] As a preferred technical solution of this utility model, a plug plate is fixedly connected to the center of one end of the linkage shaft, a bearing is sleeved on the outer side wall of the plug plate, and a plug hole matching the plug plate and the bearing is opened at the other end of the linkage shaft.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This utility model adopts an innovative structure with a separate layout of external and internal reducers. It separates the traditional internal two-stage reducer into a high-speed external reducer and a low-speed internal reducer. The auxiliary power provided by the motor first undergoes a first speed reduction through the external reducer, and then the power is transmitted to the internal reducer through the transmission shaft for a second speed reduction, finally driving the fan to rotate. The transmission load generated by the external reducer is reduced through multiple linkage shafts. This solves the problems of the complex internal structure of the reducer in the existing traditional industrial circulating water cooling tower electric drive fan system, the high speed of the reducer, the easy damage, and the inconvenience of maintenance after damage. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the cooling tower according to an embodiment of the present utility model;

[0020] Figure 2 This is a front view of the fan system according to an embodiment of the present utility model;

[0021] Figure 3 This is a cross-sectional view of the built-in reducer according to an embodiment of the present utility model;

[0022] Figure 4 This is a cross-sectional view of the external speed reducer according to an embodiment of the present utility model;

[0023] Figure 5 This is a schematic diagram of the transmission shaft structure according to an embodiment of the present utility model;

[0024] Figure 6 This is a schematic diagram of the exploded structure of the stabilizing mechanism according to an embodiment of the present invention;

[0025] Figure 7 This is a partial exploded view of the linkage shaft in an embodiment of the present invention;

[0026] Figure 8 This is a cross-sectional view of the slide tube according to an embodiment of the present utility model.

[0027] In the diagram: 1. Motor; 11. First spur gear; 2. Fan; 21. First bevel gear; 3. Built-in reducer; 31. Second bevel gear; 4. External reducer; 41. Second spur gear; 5. Drive shaft; 51. Linkage shaft; 511. Insert plate; 512. Bearing; 6. Side strip; 61. Slide rod; 611. Spring; 612. Limiting block; 7. Slide cylinder; 71. Pad; 72. Through hole; 8. Stabilizing mechanism; 81. Base; 82. Cover. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-8 This embodiment provides an electric drive fan system for an industrial circulating water cooling tower, including a motor 1 and a fan 2. Both the motor 1 and the fan 2 are installed in the main body of the cooling tower. An internal reducer 3 and an external reducer 4 are provided between the motor 1 and the fan 2. The power generated by the motor 1 is transmitted to the fan 2 through the internal reducer 3 and the external reducer 4, which drives the fan 2 to rotate.

[0030] like Figure 4 As shown, a drive shaft 5 connects the built-in reducer 3 and the external reducer 4. A first spur gear 11 is fixedly sleeved on the output shaft of the motor 1. A second spur gear 41 is rotatably mounted inside the external reducer 4, and the first spur gear 11 and the second spur gear 41 mesh with each other. The second spur gear 41 is fixedly sleeved on one end of the drive shaft 5. When the motor 1 is started, the output shaft of the motor 1 rotates, which in turn drives the drive shaft 5 to rotate through the meshing first spur gear 11 and second spur gear 41.

[0031] like Figure 3 As shown, the fan 2 has a first bevel gear 21 fixedly sleeved on its rotating shaft, and a second bevel gear 31 is rotatably mounted inside the built-in reducer 3, with the second bevel gear 31 meshing with the first bevel gear 21. The second bevel gear 31 is fixedly sleeved on the other end of the drive shaft 5. When the drive shaft 5 rotates, the meshing first bevel gear 21 and second bevel gear 31 drive the fan 2 to rotate.

[0032] Compared to the two-stage reducers in traditional industrial circulating water cooling tower electric drive fan systems, the auxiliary power provided by motor 1 first undergoes a first speed reduction via an external high-speed reducer 4, and then the power is transmitted to the internal low-speed reducer 3 via drive shaft 5 for a second speed reduction, ultimately driving the fan 2 to rotate. This two-reducer transmission structure is simple in structure, and the internal low-speed reducer 3, being only a single-stage transmission, is not easily damaged due to its low input speed and requires virtually no maintenance. The external high-speed reducer 4 is also a single-stage gear transmission, with a simple structure and is also not easily damaged. The design of the external reducer 4 allows for direct inspection or replacement at the top of the tower, eliminating the need for a high-altitude work platform or disassembling the fan 2, significantly reducing downtime and costs. If a backup replacement mode is used, it only takes 2-3 hours, with minimal impact on production (the external reducer 4 has a simple structure, therefore the backup equipment cost is also very low).

[0033] Most existing power transmission systems use a single long drive shaft 5 for transmission. This long drive shaft 5 bears the entire transmission load, thus being subject to greater torque and vibration, making it prone to fatigue damage. Therefore, a more rigid drive shaft 5 is required; otherwise, deformation can easily occur, affecting transmission accuracy. To reduce the overall transmission load on the drive shaft 5, it includes multiple linked shafts 51. These linked shafts 51 are interconnected and transmit power. Compared to a long drive shaft 5, multiple short linked shafts 51 distribute the load across multiple shafts, reducing the burden on any single shaft and improving transmission reliability. In short-shaft transmissions, if one linked shaft 51 fails, the impact on other linked shafts 51 is minimal, facilitating localized repair or replacement. Because the load on each short shaft (linked shaft 51) in the transmission system is smaller, vibration and noise generation are reduced.

[0034] like Figure 7 As shown, a socket 511 is fixedly connected to the center of one end of the linkage shaft 51, and a bearing 512 is sleeved on the outer wall of the socket 511. An insertion hole is opened at the other end of the linkage shaft 51. The socket 511 and the bearing 512 of the linkage shaft 51 are inserted into the insertion holes of adjacent linkage shafts 51, thereby enabling multiple linkage shafts 51 to rotate coaxially through the socket 511 and the bearing 512. The bearing 512 also ensures the rotation between multiple linkage shafts 51.

[0035] Direct connection to the linkage shaft 51 also results in direct transmission. To buffer the transmission of the linkage shaft 51, such as... Figures 6 to 8As shown, one end of the linkage shaft 51 is connected to two side strips 6, and the other end is connected to two slide cylinders 7. One end of the side strip 6 is fixedly connected to a slide rod 61, and one end of the slide rod 61 is slidably inserted into the slide cylinder 7 of the adjacent linkage shaft 51. A spring 611 is sleeved on the outer wall of the slide rod 61. After the linkage shaft 51 connected to the external reducer 4 rotates, the spring force of the spring 611 drives the adjacent linkage shaft 51 to rotate until the transmission reaches the linkage shaft 51 connected to the built-in reducer 3. After the slide rod 61 slides to one end inside the slide cylinder 7, it applies a thrust to the slide cylinder 7, thereby causing multiple linkage shafts 51 to directly transmit power. However, due to the presence of the spring 611, the transmission between the linkage shafts 51 is buffered, allowing the rotation of the linkage shaft 51 to gradually accelerate. This ensures the transmission of the linkage shaft 51 while avoiding excessive load on a single linkage shaft 51 during actual transmission, which could lead to overload or wear of the shaft or even mechanical failure. This also avoids uneven load distribution in the short shaft (linkage shaft 51) transmission system, which would affect the stability and service life of the system.

[0036] To prevent the slide rod 61 from detaching from the slide cylinder 7, a limiting block 612 is fixedly connected to one end of the slide rod 61. The diameter of the limiting block 612 is smaller than the opening diameter of the slide cylinder 7, thereby limiting the slide rod 61.

[0037] The presence of the limiting block 612 forms a piston-like structure. In order to prevent the air pressure inside the slide cylinder 7 from affecting the limiting block 612 and thus increasing the sliding resistance of the slide rod 61, a through hole 72 is provided at the end of the slide cylinder 7 away from the edge strip 6. The through hole 72 ensures the interaction between the slide cylinder 7 and the outside air, thereby maintaining the stability of the air pressure inside the slide cylinder 7.

[0038] After the linkage shaft 51 rotates, causing the limiting block 612 to abut against one end of the slide cylinder 7 of the adjacent linkage shaft 51, the slide cylinder 7 can be pushed, thereby driving the remaining linkage shafts 51 to rotate one by one. In order to make the limiting block 612 flexibly contact one end of the slide cylinder 7, a pad 71 is installed inside the slide cylinder 7. The pad 71 is made of rubber, so that the limiting block 612 makes flexible contact with one end of the slide cylinder 7.

[0039] Due to the clearance fit between the linkage shafts 51, a certain angle can easily occur between them. To ensure that all linkage shafts 51 are arranged in a straight line and on the same rotating shaft, a stabilizing mechanism 8 is installed inside the main body of the cooling tower. Figure 5 and Figure 6As shown, multiple stabilizing mechanisms 8 are arranged evenly in a straight line. Each stabilizing mechanism 8 includes a base 81 and a cover 82. The base 81 is fixedly installed inside the cooling tower body, and the cover 82 is connected to the base 81 by screws. The cover 82 and the base 81 are combined to form a ring structure, which is sleeved at the connection point of two linkage shafts 51. The stabilizing mechanism 8 supports and stabilizes the rotational connection between the linkage shafts 51, thereby ensuring that all linkage shafts 51 are on the same rotating axis.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power driven fan system for industrial recirculating water cooling towers, characterized in that, include: Motor (1), fan (2), built-in reducer (3) and external reducer (4); Installed inside the cooling tower body, the output shaft of the motor (1) is connected to an external reducer (4), and the shaft of the fan (2) is connected to an internal reducer (3); A drive shaft (5) is connected between a built-in reducer (3) and an external reducer (4). The drive shaft (5) includes multiple linkage shafts (51) for reducing the transmission load.

2. A system for an electrically driven fan for an industrial recirculating water cooling tower as defined in claim 1, wherein: The output shaft of the motor (1) is fixedly sleeved with a first spur gear (11), and the external reducer (4) is rotatably mounted with a second spur gear (41) that meshes with the first spur gear (11). The second spur gear (41) is fixedly sleeved on one end of the transmission shaft (5).

3. A system for an electrically driven fan for an industrial recirculating water cooling tower as defined in claim 2, wherein: The fan (2) has a first bevel gear (21) fixedly sleeved on its shaft, and the built-in reducer (3) has a second bevel gear (31) that meshes with the first bevel gear (21) rotatably installed inside, and the second bevel gear (31) is fixedly sleeved on the other end of the transmission shaft (5).

4. A system for an electrically driven fan for an industrial recirculating water cooling tower as defined in Claim 1, wherein: One end of the linkage shaft (51) is connected to two side strips (6), and the other end is connected to two slide cylinders (7). One end of the side strip (6) is fixedly connected to a slide rod (61), and one end of the slide rod (61) is slidably inserted into the slide cylinder (7) of the adjacent linkage shaft (51). The outer wall of the slide rod (61) is fitted with a spring (611) for buffering.

5. The electrically driven fan system for an industrial circulating water cooling tower according to claim 4, characterized in that: One end of the slide rod (61) is fixedly connected to a limiting block (612) to prevent the slide rod (61) from disengaging from the slide cylinder (7).

6. A system for an electrically driven fan for an industrial recirculating water cooling tower as defined in claim 5, wherein: One end of the slide tube (7) is provided with a through hole (72) for ventilation.

7. A system for an electrically driven fan for an industrial recirculating water cooling tower according to claim 6, characterized in that: A cushioning pad (71) is installed at one end of the inside of the slide (7).

8. A system for an electrically driven fan for an industrial recirculating water cooling tower as defined in claim 4, wherein: The cooling tower body is equipped with a stabilizing mechanism (8) for stabilizing the connection of two linkage shafts (51). The stabilizing mechanism (8) includes a base (81) and a cover (82). The base (81) is fixedly installed inside the cooling tower body. The cover (82) is connected to the base (81) by a screw. The cover (82) and the base (81) are combined into a ring structure and are sleeved at the connection of the two linkage shafts (51).

9. A system for an electrically driven fan for an industrial recirculating water cooling tower according to claim 8, characterized in that: One end of the linkage shaft (51) is fixedly connected to a insert plate (511), and a bearing (512) is sleeved on the outer side wall of the insert plate (511). The other end of the linkage shaft (51) is provided with a socket that matches the insert plate (511) and the bearing (512).

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