CN107989828A - A kind of anti-blade suitable for trunnion axis wind turbine throws winged safety device - Google Patents

Abstract

The invention relates to a safety device suitable for preventing blades from being thrown off by a horizontal axis fan, and belongs to the technical field of fans. The device includes an anti-throwing device and a throwing judgment alarm device; the anti-throwing device includes fan blades, shear webs, holes, cables, fixers between shear webs, wheels and hub end fixers; throwing judgment The early warning device includes a tension sensor, a signal detection processing module, a judgment controller and a signal transmission module. If the tension sensor detects that the tension of the cable suddenly increases greatly beyond the preset safety value, the blade is diagnosed as broken, and it can be confirmed that the approximate location of the break is between the holes corresponding to the two tension sensors that are tensioned. The signal transmission module transmits the alarm information to the control center, and at the same time decelerates or stops the fan. The device has the advantages of low cost, simple structure, convenient installation and the like. The invention greatly improves the reliability and safety in the operation process of the fan.

Description

A safety device for preventing blade throwing of horizontal axis fan

technical field

The invention relates to a safety device suitable for preventing blades from being thrown off by a horizontal axis fan, and belongs to the technical field of fans.

Background technique

During the operation of the fan, the fan blades rotate around the fan rotor at high speed. When the fan blade breaks, the fan blade will be thrown out at high speed. The thrown blades greatly threatened the life and property safety of passing vehicles and residents around the wind turbine. Therefore, all countries in the world need to set a certain distance safety zone around the wind farm. This safety zone wastes land resources to a great extent, increases the initial construction cost of the wind farm, and is not conducive to the popularization and application of wind energy as a clean energy.

Contents of the invention

The invention provides a device capable of reducing the damage caused by the breakage and throwing of fan blades, which can quickly give an early warning after the breakage of the blades occurs.

Technical scheme of the present invention:

A blade throwing prevention safety device suitable for a horizontal axis fan, the blade throwing prevention safety device includes an anti throwing device and a throwing judgment alarm device;

The anti-throwing device includes a fan blade 1, a shear web 2, a hole 3, a cable 4, a fixer 5 between the shear webs, a hub 6 and a hub end fixer 7; the shear web 2, two in total, installed parallel to the inside of the fan blade 1 along the horizontal direction, and the two sides of the shear web 2 are respectively fixed on the inner wall of the fan blade 1; Symmetrical holes 3; the hub 6 is equipped with a hub end fixer 7; the cables 4 pass through all the holes 3 in sequence, one end of which is fixed on the tip inner wall of the fan blade 1, and the other end is fixed on the hub On the end anchor 7; the anchor 5 between the shear webs is installed on the cable 4 between each group of holes 3, and the size of the anchor 5 between the shear webs is greater than the diameter of the holes 3;

The throwing judging and early warning device includes a tension sensor 8, a signal detection processing module, a judging controller and a signal transmission module; the tension sensor 8 is installed on the cable 4 between adjacent holes 3 on the same shear web 2 Above; the data generated by the tension sensor 8 is transmitted to the judging controller through the signal detection and processing module, and the signal transmission module transmits the alarm information sent by the judging controller to the control center.

Beneficial effects of the present invention: the device has the advantages of low cost, simple structure and convenient installation. The invention greatly improves the reliability and safety in the operation process of the blower fan.

Description of drawings

Figure 1 is a schematic diagram of the internal part of the blade.

Fig. 2 is a schematic diagram of the hub part.

Among them: 1 fan blade; 2 shear web; 3 hole; 4 cable; 5 fixer between shear web; 6 hub; 7 hub end fixer; 8 tension sensor.

Detailed ways

The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

A safety device for preventing blade throwing of horizontal axis fans, as shown in Figure 1 and Figure 2. On the premise of ensuring that the strength of the fan blade meets the requirements, several (1 to 15) groups of holes 3 are opened on the shear web 2 of the fan blade 1 for the cables 4 to pass through. One end of the cable passes through each group of holes 3 in turn.

The hole 3 should not affect the overall structural reliability of the blade. The holes 3 are numbered sequentially from the blade root to the blade tip, and the two shear webs are numbered with the letters a and b respectively, and hole 3-5a and hole 3-5b are represented by hole group 3-5.

The cable 4 can be in a tensioned state or a slack state, but it should be ensured that the slack length of the cable does not collide with other parts of the fan after the break occurs.

On the cable between every group of holes, add a fixator 5 bigger than the holes. The fixer 5 should ensure that the blade can be stuck in the hole 3 when the rear end corresponding to the opening breaks. Cables 4 connecting adjacent holes 3 on the same shear web 2 are equipped with tension and strain sensors 8 .

The other end of the cable 4 is fixed to the anchor 7 at the center of the hub 6 . The fixer 7 rotates with the hub 6 and the blade 1 .

The data generated by the tension sensor 8 is transmitted to the judgment controller through the signal detection processing module. If the fan blade breaks, the two sets of cables closest to the section are tightened, and the anchor 5 between the shear webs is stuck in the corresponding hole 3 . If the tension sensor 8 detects that the tension of the cable 4 suddenly increases greatly beyond the preset safety value, the blade is diagnosed as broken, and it can be confirmed that the approximate location of the breakage is between the holes corresponding to the two tension sensors 8 that are tensioned. The signal transmission module transmits the alarm information to the control center.

At the same time, decelerate or shut down the fan to minimize the negative effects of the blades being thrown away.

For example, in operation, for some reason, its blade broke between hole group 3-5 and hole group 3-6. If the cable 4 between the hole group 3-5 and the hole group 3-6 is connected through the hole 3-5a and the hole 3-6a, the corresponding shear web anchor between the hole group 3-5 and the hole group 3-6 5 is stuck in hole group 3-5 and hole group 3-6. The tension sensor 8 between the hole 3-5a and the hole 3-6a detects that the cable 4 is tensioned and the tension exceeds a preset safety value, an alarm is sent, and the fan stops working.

Claims (1)

1. a kind of anti-blade suitable for trunnion axis wind turbine throws winged safety device, it is characterised in that the anti-blade, which is thrown, to fly Safety device include it is anti-throw fly device and throw fly judge warning device；

The anti-throwing flies solid between device, including fan blade (1), shear web (2), hole (3), hawser (4), shear web Determine device (5), wheel hub (6) and wheel hub end fixator (7)；The shear web (2) totally two, is installed along horizontal direction parallel In the inside of fan blade (1), two sides of shear web (2) are separately fixed on the inner wall of fan blade (1)；Described is anti- Multigroup symmetrical hole (3) is provided with shear web (2)；Wheel hub end fixator (7) is installed on the wheel hub (6)；Described Hawser (4) sequentially passes through institute's hole (3), and on the blade tip inner wall one end of which is fixed on fan blade (1), the other end is fixed on wheel On hub end fixator (7)；Fixator (5) is installed on the hawser (4) between every group of hole (3) between the shear web, is resisted The size of fixator (5) is more than the diameter of hole (3) between shear web；

The throwing flies to judge prior-warning device, including tension sensor (8), signal detection processing module, judges controller and letter Number transport module；The tension sensor (8) is installed on the hawser (4) between adjacent holes (3) on same shear web (2) On；Tension sensor (8), which produces data and is transferred to by signal detection processing module, to be judged in controller, and signal transmission module will Judge that the warning message that controller is sent is transferred to control centre.