CN209638051U - Axial flow fan for cooling tower - Google Patents

Abstract

The utility model discloses an axial flow fan used for cooling towers, which comprises a casing made of silicon steel, a wheel hub, blades and a motor inside the casing, the inside of the wheel hub is hollow, a motor is fixed inside the wheel hub, and a Adjusting the bevel gear, the motor is connected with the adjusting bevel gear and can drive the adjusting bevel gear to rotate. The circumferential surface of the hub is evenly spaced with a plurality of circular grooves. The blades are fixed on the circumferential surface of the hub through the connecting assembly. The connecting assembly and The circular grooves are pivotally fitted to adjust the mounting angle of the blades. The axial flow fan used for cooling towers of the utility model has good surface corrosion resistance and is easy to install and adjust. The working angle of the blades of the axial flow fan is adjusted by rotating the connecting components to adjust the actual ventilation volume and wind pressure of the fan.

Description

Axial fans for cooling towers

technical field

The utility model relates to the technical field of fans, in particular to an axial flow fan used for cooling towers.

Background technique

Axial flow fans have a wide range of uses and are often used in various places that require cooling and ventilation. The axial flow fan mainly includes a fan body and an impeller. The casing generally has a cylindrical structure to form an air outlet, and the impeller is installed in the air outlet; the impeller can rotate in the air outlet under the drive of an appropriate power mechanism, and the gas enters from the front end of the air outlet. , can obtain energy through the rotating impeller, increase the pressure and flow rate, and then discharge from the rear end of the air outlet to realize the flow of air.

At present, many devices need to be equipped with axial flow fans, and the operating state of the axial flow fans is required to be adjusted according to the needs of specific working conditions. Among them, mechanical ventilation cooling towers usually use axial flow fans for forced ventilation. The fan of the cooling tower is mainly used to extract the air with high-temperature steam, so the working environment of the fan is relatively harsh. At present, the casing of the fan is made of ordinary steel materials, and severe corrosion often occurs after long-term use, resulting in The service life of the fan is insufficient; in addition, the blades of the impellers in the current fans are either integrally formed with the hub, or fixedly installed on the hub. Either way, once the processing is completed, the angle of the blades cannot be changed, resulting in the ventilation of the fan. The wind pressure cannot be adjusted, and the applicability is weak, and the replacement of blades with appropriate parameters also increases the cost burden and reduces the effective utilization rate of the machine.

Therefore, those skilled in the art are devoting themselves to developing an axial flow fan for cooling towers, which has good corrosion resistance and can adjust the blade angle to meet the air volume and air pressure required by different working conditions.

Utility model content

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is that the current axial fans for cooling towers have poor corrosion resistance and relatively high cost of blade angle replacement.

In order to achieve the above purpose, the utility model provides an axial flow fan for cooling towers, which includes a casing made of silicon steel, a hub, blades and a motor inside it, the hub is hollow inside, and a motor is fixed inside the hub. The center of the wheel hub is fixed with an adjusting bevel gear, and the motor is connected with the adjusting bevel gear and can drive the adjusting bevel gear to rotate. A plurality of circular grooves are evenly spaced on the circumferential surface of the wheel hub, and each circular groove has a There is a connecting hole in the center and a plurality of positioning holes of the same size and located on the periphery. The centers of the positioning holes are all located on the same circle, and the positions of the centers corresponding to the circle coincide with the positions of the centers of the connecting holes and the circular grooves;

The blade is fixed on the circumferential surface of the hub through the connection assembly. The connection assembly is rotatably matched with the circular groove. The connection assembly includes a connection part that fits with the blade and a fixing part. There is a fixed rod extending into the hub. The end of the fixed rod is fixed with a driven bevel gear, which meshes with the adjusting bevel gear. There are several arc grooves evenly distributed on the circumference of the fixed part. It is distributed in a circular shape, and the center of the circular distribution coincides with the axis of the fixed rod. The fastening bolts are connected to different positioning holes through arc grooves to adjust the installation angle of the blades.

Further, there are supporting seats corresponding to the blades in the hub, the fixing rods pass through the supporting seats, and the supporting seats and the fixing rods are connected by bearings.

Further, spring washers and flat washers are sequentially arranged on the contact surfaces between the fastening bolts and the hub.

Further, the connecting part is a plate-shaped structure, and the overlapping part of the connecting part and the blade has a similar shape, and is fixedly connected with the blade by screws.

Further, there are two arc grooves, which are symmetrically distributed in the circumferential direction of the fixing part.

Further, the casing includes a cylindrical casing and a mounting frame fixed inside one end of the casing, a grid is fixed on the mounting frame, and the motor is fixed on the mounting frame.

Furthermore, two parallel ring cavities are formed on the front inner wall of the casing, and the two ring cavities are respectively located at the front side and the rear side of the blades, and an anti-surge device is provided in the ring cavities.

Furthermore, the anti-surge device includes a plurality of disturbing fins evenly distributed on the inner wall of the annular cavity, and a guide ring is provided on the end of the spoiler near the blade, the width of the guide ring is smaller than the length of the spoiler, The deflector ring is arranged concentrically with the hub.

Further, the blade and the hub are coated with a galvanized layer with anti-corrosion effect.

Further, the front end of the hub is fixed with an outer cover by bolts.

The axial flow fan used for cooling towers of the utility model has good corrosion resistance on the surface, and is easy to install and adjust. The working angle of the blades of the axial flow fan is adjusted by rotating the connecting components to adjust the actual ventilation volume and wind pressure of the fan. Compared with other transformation methods at present, the investment in equipment transformation cost is greatly reduced.

The conception, specific structure and technical effects of the present utility model will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, characteristics and effects of the present utility model.

Description of drawings

Fig. 1 is a schematic diagram of the composition of an axial flow fan used in a cooling tower of the present invention.

Fig. 2 is a schematic diagram of the casing of the axial flow fan used in the cooling tower of the present invention.

Fig. 3 is a schematic diagram of the connection between the hub and blades of the axial flow fan used for cooling towers of the present invention.

Fig. 4 is a structural schematic diagram of the connection assembly of the axial flow fan used in the cooling tower of the present invention.

Fig. 5 is a schematic diagram of the internal structure of the casing of the axial flow fan used in the cooling tower of the present invention.

In the figure, 1 casing, 2 hub, 3 blades, 4 adjusting bevel gear, 5 circular groove, 6 connecting hole, 7 positioning hole, 8 shell, 9 mounting frame, 10 grid, 11 connecting component, 12 connecting part , 13 fixed part, 14 fixed rod, 15 driven bevel gear, 16 arc groove, 17 support seat, 18 ring cavity, 19 spoiler, 20 guide ring, 21 outer cover, 22 fastening bolts.

Detailed ways

As shown in Figure 1, it is an axial flow fan for a cooling tower disclosed by the utility model, which includes a casing 1 made of silicon steel and a hub 2, blades and motors located inside it, the hub 2 is hollow inside, and the hub 2 is fixed with a motor (not shown in the figure), and the center of the hub 2 is fixed with an adjustment bevel gear 4, and the motor is connected with the adjustment bevel gear 4 and can drive the adjustment bevel gear 4 to rotate. As shown in Figure 2, the casing includes a cylindrical casing 8 and a mounting frame 9 fixed on the inside of one end of the casing 8. A grid 10 is fixed on the mounting frame 9, and the motor is fixed on the mounting frame 9. The grid 10 can prevent Foreign matter enters the casing and damages the blades.

Figure 3 is a schematic diagram of the connection between the hub and the blades. A plurality of circular grooves 5 are evenly spaced on the circumference of the hub 2, and each circular groove 5 is provided with a connecting hole 6 located in the center and a plurality of positioning holes of the same size and located on the periphery. 7. The centers of the positioning holes 7 are located on the same circle, and the positions of the centers corresponding to the circle coincide with the positions of the centers of the connecting hole 6 and the circular groove 5 . The blade is fixed on the circumferential surface of the hub 2 through the connecting assembly 11, and the connecting assembly 11 is rotatably matched with the circular groove 5. The connecting assembly 11 includes a connecting part 12 and a fixing part 13 fitted to the blade, and the fixing part 13 is connected to the circular groove 5. The groove 5 rotates and cooperates, and the end face of the fixed part 13 is extended with a fixed rod 14, and the fixed rod 14 extends into the hub 2, and the end of the fixed rod 14 is fixed with a driven bevel gear 15, and the driven bevel gear 15 meshes with the adjusting bevel gear 4, By rotating the adjusting bevel gear 4, the driven bevel gear 15 is driven to rotate, thereby causing the blades to rotate. Through the above technical solution, the blade fixing rod 14 extends into the hub 2 for positioning, and then adjusts the inclination angle of the blade through the connecting assembly 11, so as to control the wind force of the fan and realize the purpose of adjusting the output power of the fan.

Figure 4 is a schematic structural diagram of the connection assembly. In the connecting assembly 11, the connecting part 12 is a plate-shaped structure, and the shape of the overlap between the connecting part 12 and the blade is similar, and the blade is fixedly connected with the blade; the fixed part 13 is a cake-shaped structure, and its size is equivalent to the circular groove 5. It can be installed into the circular groove 5. There are several circular arc grooves 16 evenly distributed in the circumferential direction of the fixed part 13. The circular arc grooves 16 are distributed in a circular shape, and the center of the circular distribution in the circular shape coincides with the axis of the fixed rod 14. , the fastening bolts 22 are connected to different positioning holes 7 through the arc grooves 16 to adjust the installation angle of the blades. Preferably, two arc grooves 16 are provided, and are symmetrically distributed in the circumferential direction of the fixing portion 13 .

During installation and adjustment, when the fixed rod extends into the connecting hole, the fixed part rotates with the axis of the fixed rod as the axis of rotation. Since the center of the ring formed by the distribution of the arc grooves coincides with the axis of the fixed rod, the adjustment When adjusting the angle of the blade, the user only needs to loosen the fastening bolt until the fixed part can rotate, and then tighten the fastening bolt again after adjusting the angle. Then reinstall the position of the fastening bolt so that it corresponds to the new positioning hole in the arc groove, so that the number of disassembly and assembly of the fastening bolt and the blade can be reduced, and the work efficiency of adjusting the angle of the axial flow fan blade can be improved.

Preferably, spring washers and flat washers are sequentially provided on the contact surfaces between the fastening bolts 22 and the hub 2 .

The tools for installing and removing fastening bolts are commonly used tools, and there is no need to equip special tools for installation and removal; at the same time, if the fastening bolts used to fix the connection components are lost, users can also purchase them by themselves according to the type of fastening bolts. On the one hand, it is convenient for users to adjust the blade angle by themselves, and on the other hand, it makes the post-maintenance work of the axial flow fan easier to carry out.

As a preferred embodiment, there are support seats 17 corresponding to the blades in the hub, the fixed rod passes through the support seat 17, and the support seat 17 and the fixed rod are connected by bearings. By setting the support seat 17, it can further increase The connection strength of the fixed rod.

In addition, two parallel ring cavities 18 are formed on the front inner wall of the casing 1, and the two ring cavities 18 are respectively located at the front side and the rear side of the blade, and an anti-surge device is provided in the ring cavities 18. The anti-surge device comprises disturbing baffles 19 evenly distributed and fixed on the inner wall of the annular cavity 18, and the end of the baffle 19 near the blade is provided with a guide ring 20, and the width of the guide ring 20 is smaller than that of the spoiler 19. length, the guide ring 20 is arranged concentrically with the hub. The spoiler 19 is a rectangular metal sheet, and the narrow side of the spoiler 19 is provided with a radian, and one side long side of the spoiler 19 is fixed on the inner wall of the annular cavity 18, and the other side of the spoiler 19 The long sides are fixed on the outer wall of the guide ring 20 . The anti-surge device can prevent the surge phenomenon of the axial flow fan.

The blades and the hub are coated with a galvanized layer with anti-corrosion effect. The front end of the wheel hub is also fixed with an outer cover 21 by bolts. The casing made of silicon steel and the galvanized layer for protection make the axial flow fan of the utility model more durable and corrosion-resistant, and suitable for the environment of a cooling tower.

In the axial flow fan used for cooling towers of the utility model, the blades are installed on the hub through the connecting assembly, and the user adjusts the working angle of the blades of the axial flow fan by rotating the connecting assembly. The angle of the blade increases. In actual use, the user can adjust the actual ventilation volume and wind pressure of the fan by adjusting the angle of the blade. Compared with other transformation methods at present, the cost of equipment transformation is greatly reduced.

The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the utility model without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection defined by the claims .

Claims (10)

1. a kind of axial flow blower for cooling tower, which is characterized in that including using casing made of silicon steel and position in the inner Wheel hub, blade and the motor in portion, hub interior is hollow, and motor is fixed in wheel hub, and the center of wheel hub, which is fixed with, adjusts bevel gear, Motor connect and can drive adjusting bevel gear rotation with bevel gear is adjusted, and is provided with evenly and at intervals on the periphery of wheel hub multiple Circular groove, and it is provided in each circular groove centrally located connecting hole and multiple in the same size and be located at periphery Location hole, the center of circle of location hole is respectively positioned on same circumference, and the corresponding center location of the circumference and connecting hole and round recessed The center location of slot is overlapped；

Blade is fixed on the periphery of wheel hub by connection component, and connection component is rotatably assorted with circular groove, connection component Including the interconnecting piece and fixed part being bonded with blade, fixed part is rotatably assorted with circular groove, and the end face of fixed part is extended with Fixed link, fixed link protrude into wheel hub, and the end of fixed link is fixed with driven wheel of differential, and driven wheel of differential is nibbled with bevel gear is adjusted It closes, is evenly distributed with several arc grooves in the circumferential direction of fixed part, arc groove circumferentially annular distribution, and circumference annular distribution The center of circle is overlapped with the axis of fixed link, and fastening bolt connects different location holes by arc groove, to adjust the established angle of blade Degree.

2. being used for the axial flow blower of cooling tower as described in claim 1, which is characterized in that also have with blade one by one in wheel hub Corresponding support base, fixed link pass through support base, are connected between support base and fixed link by bearing.

3. being used for the axial flow blower of cooling tower as described in claim 1, which is characterized in that the contact surface of fastening bolt and wheel hub On be disposed with spring washer and plain washer.

4. being used for the axial flow blower of cooling tower as described in claim 1, which is characterized in that interconnecting piece is plate structure, and even Socket part is similar to the overlapping position shape of blade, is connected with blade by screw.

5. being used for the axial flow blower of cooling tower as described in claim 1, which is characterized in that arc groove is provided with 2, and symmetrical Ground is distributed in the circumferential direction of fixed part.

6. being used for the axial flow blower of cooling tower as described in claim 1, which is characterized in that casing includes cylindrical shell Be fixed on mounting rack of the shell wherein on the inside of one end, be fixed with grid on mounting rack, motor is fixed on mounting rack.

7. being used for the axial flow blower of cooling tower as described in claim 1, which is characterized in that formed on the front inner wall of casing The parallel ring cavity of twice, twice ring cavity are located at front side and the rear side of blade, are equipped with anti-surge installation in ring cavity.

8. being used for the axial flow blower of cooling tower as claimed in claim 7, which is characterized in that anti-surge installation includes uniformly distributed fixed Several spoilers on the inner wall of ring cavity, spoiler are equipped with guide ring close to one end of blade, and the width of guide ring is less than The length of spoiler, guide ring and the concentric setting of wheel hub.

9. being used for the axial flow blower of cooling tower as described in claim 1, which is characterized in that being coated with outside blade and wheel hub has The zinc coat of anti-corrosion effect.

10. being used for the axial flow blower of cooling tower as described in claim 1, which is characterized in that the front end of wheel hub is solid by bolt Surely there is outer cover.