CROSS REFERENCE TO THE RELATED APPLICATIONS

This application is the national phase entry of International Application No. PCT/CN2020/101011, filed on Jul. 9, 2020, which is based upon and claims priority to Chinese Patent Application No. 201922310061.9, filed on Dec. 20, 2019, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention belongs to the technical field of cooling towers, and more particularly, to an adaptive steel structure cooling tower for resisting a severe typhoon.

BACKGROUND

Cooling towers as highly efficient apparatus are used to release waste heat of thermal power plants. Such towers have grown significantly in proportion to the amount of power produced by modern plants and tend to an ultra-high size. The safety margins of such flexible tower bodies, however, have decreased over the years. China has a long coastline and frequent typhoons. Rapid coastal economic development and increased electricity consumption has resulted in construction of more and more cooling towers along the coast. Cooling towers located within typhoon range with exposure to excessive wind loads has also increased sharply.

In order to improve structural stability of the cooling tower, a steel structure, like the one proposed in Chinese patent application No. 201620659993.8 has been proposed. That steel structure cooling tower has a crossed truss pattern, wherein a tower shape adopts a hyperbolic shape or a straight-cone shape, so that the tower can ensure uniform force applied to a tower body, and enhance the structure's stability. Anti-typhoon and aseismic performances, as well as the adaptability of the tower's curvature are all improved. A large windward area caused by the trend of ultra-high cooling towers, however, means that the cooling tower remains vulnerable to excessive wind loads under an extremely severe typhoon environment, which further causes a problem of increasing difficulty in the design of the cooling tower structure. This shortcoming is not addressed by the crossed truss pattern of the steel structure cooling tower disclosed in Chinese patent application No. 201620659993.8.

The magnitude of the wind load acting on the surface of the tower body of the cooling tower is decided by a wind pressure multiplied by the windward area. The active control opening and closing system has been applied in the fields of electric windows and the like, but it is mainly used to solve manpower problems and smart homes, and has not been effectively applied to steel structure cooling towers. Therefore, the intelligent opening and closing technology of the enclosure plate of the steel structure cooling tower has detailed and advanced technical reserves and broad application prospects.

Thus, the intelligent opening and closing technology of the enclosure plate is applied to the steel structure cooling tower to enable the cooling tower to actively control and adjust the windward area in a severe typhoon environment, which can effectively reduce the wind loads acting on the surface of the tower body and further directly decrease the design loads of the cooling tower structure.

SUMMARY OF INVENTION

A technical problem to be resolved by the present invention is to provide an adaptive steel structure cooling tower for resisting a severe typhoon with respect to the shortcomings of the above-mentioned prior art. The adaptive steel structure cooling tower bears a structural load through a truss system, provides a hyperbolic aerodynamic shape of the cooling tower by mounting a hyperbolic enclosure plate system on the truss system to enclose the truss system to form a tower body of the cooling tower, and controls transition of an opening-closing posture of the hyperbolic enclosure plate by a servo opening-closing system to enable the cooling tower to open the enclosure plate in a severe typhoon environment, thereby effectively reducing the wind load acting on the cooling tower.

In order to realize the above technical objective, the present invention adopts the following technical solution.

An adaptive steel structure cooling tower for resisting a severe typhoon includes a truss system, a hyperbolic enclosure plate system and a servo opening-closing system. The truss system includes a plurality of hoop trusses and a plurality of meridional trusses, and the hoop trusses and the meridional trusses are crisscross connected to each other to form a bearing skeleton of the cooling tower. The hyperbolic enclosure plate system is installed in each space enclosed by the adjacent hoop truss and meridional truss. The outer side of the hoop truss and the outer side of the meridional truss protrude outwardly to the outer side of the hyperbolic enclosure plate system. The hyperbolic enclosure plate system includes a hyperbolic enclosure plate, a hyperbolic enclosure plate hoop bracket, a hyperbolic enclosure plate meridional bracket, a hyperbolic enclosure plate rotating pendant and a rotating motor. The hyperbolic enclosure plate is fixedly installed on an enclosure skeleton formed by the hyperbolic enclosure plate hoop bracket and the hyperbolic enclosure plate meridional bracket, and the hyperbolic enclosure plate rotating pendant is fixedly connected to the enclosure skeleton. The hyperbolic enclosure plate rotating pendant is parallel to the hyperbolic enclosure plate meridional bracket, and the hyperbolic enclosure plate rotating pendant is located at the middle of the enclosure skeleton. The upper end and the lower end of the hyperbolic enclosure plate rotating pendant separately position the corresponding hoop truss and are connected to the corresponding hoop truss. The hyperbolic enclosure plate rotating pendant rotates around its own axis. The rotating motor is installed on the hyperbolic enclosure plate rotating pendant, and the rotating motor is configured to drive the hyperbolic enclosure plate rotating pendant to rotate to enable the hyperbolic enclosure plate to rotate at least 90° around the axis of the hyperbolic enclosure plate rotating pendant. The servo opening-closing system includes a wind and rain sensor, and a controller. The wind and rain sensor is installed on the hoop truss at the top of the cooling tower, and is configured to measure wind pressure and rain intensity on the top of the cooling tower. The wind and rain sensor is connected to the controller, and the controller is connected to each rotating motor. When typhoon rain exceeds a limiting value, the wind and rain sensor transmits a signal to the controller, and the controller controls each rotating motor to rotate to enable the hyperbolic enclosure plate to be parallel to a wind incoming direction.

The hyperbolic enclosure plate system includes a plurality of hyperbolic enclosure plates, a plurality of hyperbolic enclosure plate hoop brackets, a plurality of hyperbolic enclosure plate meridional brackets, and a plurality of hyperbolic enclosure plate rotating pendants. Each of the hyperbolic enclosure plates is fixed on an enclosure skeleton formed by the corresponding hyperbolic enclosure plate hoop bracket and hyperbolic enclosure plate meridional bracket. Each enclosure skeleton is installed with the hyperbolic enclosure plate rotating pendant. The hyperbolic enclosure plate system is provided with only one rotating motor. The rotating motor is connected to one of the hyperbolic enclosure plate rotating pendants. All enclosure skeletons are connected by one connection rod, and the connection rod is hinged to all enclosure skeletons. When the rotating motor drives one hyperbolic enclosure plate rotating pendant connected to the rotating motor to rotate, the hyperbolic enclosure plate rotating pendant drives the connection rod to shift, and the connection rod drives the remaining enclosure skeletons to follow, so that all hyperbolic enclosure plates in one hyperbolic enclosure plate system perform a uniform action.

In order to optimize the above technical solution, the present invention further includes the following specific measures.

The truss system is in a shape steel structure or a grid structure.

The wind and rain sensor adopts a BALUK363 wireless sensor, wherein the BALUK363 wireless sensor is configured to detect a wind pressure and rain intensity signal and transfer the wind pressure and rain intensity signal as a radio signal to the controller. The controller adopts a Delta servo B2 series motor driver, wherein the Delta servo B2 series motor driver is configured to generate and transfer a motor control signal to the rotating motor when a wind pressure and rain intensity electromagnetic signal received by the Delta servo B2 series motor driver exceeds a limiting value. The rotating motor adopts a K8178R direct current (DC) remote control motor.

The hoop truss includes a hoop truss inner chord, a hoop truss outer chord and a hoop truss web member. The hoop truss outer chord is horizontally welded on the outer side of the hoop truss inner chord through the hoop truss web member. The left and right adjacent hoop truss web members are connected end-to-end.

The meridional truss includes a meridional truss inner chord, a meridional truss outer chord and a meridional truss web member. The meridional truss outer chord is longitudinally welded on an outer side of the meridional truss inner chord through the meridional truss web member. The upper and lower adjacent meridional truss web members are connected end-to-end.

The hoop truss web member and the meridional truss web member at a crisscross position are connected by welding, and the meridional truss outer chord and the hoop truss outer chord at a crisscross position are connected by welding.

The present invention has the following advantages:

1) The hoop trusses of the truss system are uniformly distributed along a height of the tower body of the cooling tower to constrain horizontal deformation of a cooling tower shell, while the meridional trusses are distributed along the meridional direction to constrain the overall overturning deformation of the tower body of the cooling tower. Therefore, the cooling tower has functions of rigid rings and meridional ribs, and the overall stability of the tower body of the cooling tower can be significantly improved.

2) The truss system protrudes outwardly on the surface of the hyperbolic enclosure plate system to effectively increase the roughness of the surface of the tower body of the cooling tower, thereby reducing a velocity of a vortex flowing through the tower body of the cooling tower and being separated from a boundary to further effectively reduce wind pressure on the surface of the tower body of the cooling tower.

3) Compared with traditional cooling towers, the present invention lays the hyperbolic enclosure plate system on the surface of the tower body of the cooling tower, and the servo opening-closing system controls the rotating motor to drive the hyperbolic enclosure plate system to adjust the opening-closing posture according to the detected wind pressure and rain intensity on the tower top in a shutdown environment when the severe typhoon comes. In a closing posture, the hyperbolic enclosure plate system can enclose to form the hyperbolic barrel of the cooling tower to provide an aerodynamic shape of the cooling tower for natural circulate ventilation. In an opening posture, the hyperbolic enclosure plate system effectively reduces the windward area of the tower body of the cooling tower to further directly reduce the wind load of the structural design of the cooling tower and improve the safety margin of the structural design.

