CN212615158U - Overspeed protection mechanism of Darrieus wind driven generator - Google Patents

Abstract

The utility model discloses an overspeed protection mechanism of a Da lie type wind driven generator, which comprises a Da lie wind wheel central shaft; the inside of the central shaft of the Da lie wind wheel is a coaxial hollow cylindrical cavity, and a rotating rod body is arranged in the hollow cylindrical cavity in a coaxial rotating mode; the utility model discloses an when equipment stall, first overspeed protection rope, second overspeed protection rope and third overspeed protection rope are respectively with first darrieus type blade, second darrieus type blade and third darrieus type blade to being close to the direction internal pulling from darrieus wind wheel center pin, have reduced the torque of first darrieus type blade, second darrieus type blade and third darrieus type blade to the purpose of the rotational speed that realizes reducing darrieus wind wheel center pin has reached the purpose of overspeed protection.

Description

Overspeed protection mechanism of Darrieus wind driven generator

Technical Field

The utility model belongs to the wind power generation field.

Background

The darrieus type wind wheel assembly can rotate at an excessive speed under the driving of natural wind in severe and windy weather, the rotating speed of the darrieus type wind wheel assembly exceeds the operating load of a generator, and the risk of equipment damage can be caused if stall protection is not carried out.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects in the prior art, the utility model provides a Da lie type wind driven generator's overspeed protection mechanism with overspeed protection.

The technical scheme is as follows: in order to achieve the purpose, the overspeed protection mechanism of the Da lie type wind driven generator comprises a Da lie wind wheel central shaft; the inside of the central shaft of the Da lie wind wheel is a coaxial hollow cylindrical cavity, and a rotating rod body is arranged in the hollow cylindrical cavity in a coaxial rotating mode; a first outer edge, a second outer edge, a third outer edge and a fourth outer edge are arranged on the rotating rod body at equal intervals from top to bottom, the rotating rod body between the first outer edge and the second outer edge is a first spiral winding section, the rotating rod body between the second outer edge and the third outer edge is a second spiral winding section, and the rotating rod body between the third outer edge and the fourth outer edge is a third spiral winding section;

a first Darrieus type blade, a second Darrieus type blade and a third Darrieus type blade are distributed on the periphery of the central shaft of the Darrieus wind wheel in a circumferential array manner; the wall body of the central shaft of the Da lie wind wheel is provided with three threading holes in a hollow manner, and the Da lie wind wheel further comprises a first overspeed protection rope, a second overspeed protection rope and a third overspeed protection rope which respectively penetrate through the three threading holes;

one end of the first overspeed protection rope is fixedly connected with one side, close to the central shaft of the darrieus wind wheel, of the first darrieus blade, and the other end of the first overspeed protection rope is fixedly connected to the lower end of the first spiral winding section; one end of the second overspeed protection rope is fixedly connected with one side, close to the central shaft of the darrieus wind wheel, of the second darrieus blade, and the other end of the second overspeed protection rope is fixedly connected to the lower end of the second spiral winding section; one end of the third overspeed protection rope is fixedly connected with one side, close to the central shaft of the darrieus wind wheel, of the third darrieus-shaped blade, and the other end of the third overspeed protection rope is fixedly connected to the lower end of the third spiral winding section.

Furthermore, the top of the hollow column cavity is a fixedly arranged threaded seat, a vertically through threaded hole is formed in the threaded seat, and the threaded hole and the hollow column cavity are coaxially arranged; the upper end of the rotating rod body is fixedly connected with a threaded rod with the same axis, and the threaded rod is in threaded fit with the threaded hole.

Furthermore, the lower section of the rotating rod body is coaxially sleeved with a plurality of restraining sleeves, the rotating rod body is in sliding fit with the inner walls of sleeve holes of the restraining sleeves, and each restraining sleeve is fixedly supported and connected with the inner wall of the hollow column cavity through a restraining sleeve support.

Furthermore, three groups of blade supporting pieces are distributed on the central shaft of the Darrieus wind wheel in a circumferential array manner, the three groups of blade supporting pieces are respectively connected with three Darrieus type blades in a supporting manner, and each group of blade supporting pieces comprises two horizontal supporting guide rods which are distributed up and down; the upper part and the lower part of each Darrieus type blade are provided with two transverse guide holes in a hollow way, the two transverse guide holes correspond to the two horizontal support guide rods of the corresponding blade supporting piece, and the two horizontal support guide rods respectively pass through the two guide holes coaxially in a sliding way; the darrieus type blades can slide along the length direction of the corresponding horizontal supporting guide rods.

Furthermore, a return spring is coaxially sleeved on each horizontal supporting guide rod; two ends of the return spring elastically press the Darrieus type blade and the fixed disc body respectively, and the return spring always has elastic pressing force towards the direction close to the limiting head on the Darrieus type blade.

Furthermore, the overspeed protection rope is made of nylon fiber with the diameter larger than 0.8cm, and the tensile resistance is not less than 1600 kg.

Has the advantages that: the utility model discloses an when equipment stall, first overspeed protection rope, second overspeed protection rope and third overspeed protection rope are respectively with first darrieus type blade, second darrieus type blade and third darrieus type blade to being close to the direction internal pulling from darrieus wind wheel center pin, the torque of first darrieus type blade, second darrieus type blade and third darrieus type blade has been reduced, thereby realize reducing the purpose of the rotational speed of darrieus wind wheel center pin, and then reduce the operational load of generator, the purpose of overspeed protection has been reached.

Drawings

FIG. 1 is an overall perspective view of the apparatus;

FIG. 2 is a front view of the present apparatus;

FIG. 3 is a schematic view of the lower portion of FIG. 2;

FIG. 4 is a top view of the apparatus;

FIG. 5 is a schematic sectional view of the apparatus;

FIG. 6 is a structural schematic diagram of a central shaft of a Da lie wind wheel in a structural section;

FIG. 7 is a schematic view of a motor case cut-away structure;

FIG. 8 is a schematic view of an integrated structure formed by a transmission column, a rotary rod and a threaded rod;

FIG. 9 is a schematic structural diagram of a first overspeed protection rope, a second overspeed protection rope and a third overspeed protection rope respectively connected with a first darrieus-type blade, a second darrieus-type blade and a third darrieus-type blade on the basis of FIG. 8;

FIG. 10 is a schematic view of a drive cylinder;

fig. 11 is a schematic view of a threaded rod.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

For better illustration of the present solution, the present embodiment is introduced by means of the overall structure of a darrieus type wind turbine.

The darrieus wind driven generator shown in fig. 1 to 11 comprises an equipment base 32, wherein a horizontal generator platform 33 is installed on the equipment base 32, a generator 34 with an input shaft 22 vertically upward is fixedly installed on the generator platform through a generator support 35, the upper end of the input shaft 22 of the generator 34 is coaxially and fixedly connected with a darrieus wind wheel assembly, and the integral rotation energy of the darrieus wind wheel assembly 100 drives a rotor of the generator 34 to operate through the input shaft 22 so as to generate electricity;

the upper end of the input shaft 22 is an integrated coaxial speed measuring disc 21, a piece of magnetic steel 23 is fixedly installed on the side part of the speed measuring disc 21, the magnetic steel 23 rotates synchronously with the speed measuring disc 21, a Hall rotating speed sensor 24 is fixedly installed on the generator support 35 through a sensor support 36, and the Hall rotating speed sensor 24 corresponds to the magnetic steel 23; the hall revolution speed sensor 24 detects the revolution speed of the tachometer disc 21 through the magnetic steel 23.

The Da lie type wind wheel assembly 100 comprises a cylindrical motor box body 20, the upper end of the motor box body 20 is coaxially and integrally connected with a Da lie wind wheel central shaft 12, and the lower end of the motor box body 20 is coaxially and integrally connected with a speed measuring disc 21; three vertical darrieus type blades 1 are distributed on the periphery of a central shaft 12 of the darrieus wind wheel in a circumferential array mode.

A flange 31 is integrally and coaxially provided on the lower side of the device base 32.

Three groups of blade supporting pieces are distributed on the central shaft 12 of the Da lie wind wheel in a circumferential array mode, the three groups of blade supporting pieces are respectively connected with the three Da lie type blades 1 in a supporting mode, and each group of blade supporting pieces comprises two horizontal supporting guide rods 6 which are distributed up and down; the upper part and the lower part of each Darrieus type blade 1 are provided with two transverse guide holes 3 in a hollow way, the two transverse guide holes 3 correspond to two horizontal support guide rods 6 of the corresponding blade support part, and the two horizontal support guide rods 6 respectively pass through the two guide holes 3 in a sliding manner coaxially; the darrieus type blades 1 can slide along the length direction of the corresponding horizontal support guide rods 6.

The tail end of each horizontal supporting guide rod 6 is fixedly connected with a limiting head 2 with the diameter larger than that of the guide hole 3; the root of each horizontal supporting guide rod 6 is uniformly and coaxially provided with a fixed disc body 9; the darrieus type blade 1 will abut against the limiting head 2 under the effect of centrifugal force when the darrieus rotor wheel central shaft 12 rotates.

Each horizontal supporting guide rod 6 is coaxially sleeved with a return spring 5; two ends of the return spring 5 elastically press the Darrieus type blade 1 and the fixed disc body 9 respectively, and the return spring 5 always has an elastic pressing force towards the direction close to the limiting head 2 on the Darrieus type blade 1.

The inside of a central shaft 12 of the Da lie wind wheel is a coaxial hollow cylindrical cavity 14, the top of the hollow cylindrical cavity 14 is a fixedly arranged threaded seat 10, a vertically through threaded hole 11 is formed in the threaded seat 10, and the threaded hole 11 and the hollow cylindrical cavity 14 are arranged coaxially; the inside of the cylindrical motor box body 20 is a coaxial motor bin 25, and the upper end of the motor bin 25 is communicated with the lower end of the hollow column cavity 14 coaxially;

a rotating rod body 15 is coaxially and rotatably arranged in the hollow column cavity 14, a plurality of restraining sleeves 18 are coaxially sleeved on the lower section of the rotating rod body 15, the rotating rod body 15 is in sliding fit with the inner walls of sleeve holes 30 of the restraining sleeves 18, and each restraining sleeve 18 is fixedly supported and connected with the inner wall of the hollow column cavity 14 through a restraining sleeve support 16;

the upper end of the rotating rod body 15 is fixedly connected with a threaded rod 8 coaxially, the threaded rod 8 is in threaded fit with the threaded hole 11, and the top end of the threaded rod 8 is fixedly provided with a ball top 7; the lower end of the rotating rod body 15 is fixedly connected with a transmission column 26 with the same axis, and the section of the transmission column 26 is an involute gear profile;

a vertical electromagnetic power-off brake motor 41 is fixedly installed in the motor bin 25, and when the electromagnetic power-off brake motor 41 is powered off, an output shaft 19 of the electromagnetic power-off brake motor 41 is in a brake state; a plurality of bearing seats 40 are fixedly arranged on the inner wall of the lower end of the hollow column cavity 14, and an output shaft 19 of an electromagnetic power-off brake motor 41 is in running fit with the bearing seats 40 through a bearing;

an involute gear 17 is synchronously installed on the output shaft 19, the involute gear 17 is meshed with the outline of an involute gear on the transmission cylinder 26, the transmission cylinder 26 can be driven to rotate by the rotation of the involute gear 17, and the involute gear 17 and the transmission cylinder 26 can slide and displace along the axial direction while being meshed with each other for transmission;

a first outer edge 50, a second outer edge 51, a third outer edge 52 and a fourth outer edge 53 are arranged on the rotating rod body 15 at equal intervals from top to bottom, the rotating rod body 15 between the first outer edge 50 and the second outer edge 51 is a first spiral winding section 15.1, the rotating rod body 15 between the second outer edge 51 and the third outer edge 52 is a second spiral winding section 15.2, and the rotating rod body 15 between the third outer edge 52 and the fourth outer edge 53 is a third spiral winding section 15.3;

the three darrieus type blades 1 are respectively a first darrieus type blade 1.1, a second darrieus type blade 1.2 and a third darrieus type blade 1.3;

three threading holes 13 are hollowed in the wall body of a central shaft 12 of the Da lie wind wheel, and the orientations of the three threading holes 13 respectively correspond to a first Da lie type blade 1.1, a second Da lie type blade 1.2 and a third Da lie type blade 1.3; the first overspeed protection rope 4.1, the second overspeed protection rope 4.2 and the third overspeed protection rope 4.3 respectively pass through the three threading holes 13; in order to ensure sufficient overspeed protection stability, the overspeed protection rope 4 of the embodiment is made of high-strength nylon fiber with the diameter larger than 0.8cm, and the tensile resistance is not less than 1600 kg.

The first overspeed protection rope 4.1, the second overspeed protection rope 4.2 and the third overspeed protection rope 4.3 are all in a horizontally tightened state; the first overspeed protection rope 4.1, the second overspeed protection rope 4.2 and the third overspeed protection rope 4.3 are overspeed protection ropes 4;

one end of the first overspeed protection rope 4.1 is fixedly connected with one side, close to the Dalie wind wheel central shaft 12, of the first Dalie type blade 1.1, and the other end of the first overspeed protection rope 4.1 is fixedly connected with the lower end of the first spiral winding section 15.1;

one end of a second overspeed protection rope 4.2 is fixedly connected with one side, close to the Darrieus wind wheel central shaft 12, of the second Darrieus type blade 1.2, and the other end of the second overspeed protection rope 4.2 is fixedly connected with the lower end of a second spiral winding section 15.2;

one end of a third overspeed protection rope 4.3 is fixedly connected with one side of the third darrieus type blade 1.3 close to the darrieus wind wheel central shaft 12, and the other end of the third overspeed protection rope 4.3 is fixedly connected with the lower end of the third spiral winding section 15.3.

The use method and the working principle of the Darrieus wind driven generator are as follows:

at normal ambient wind speed: the darrieus wind wheel assembly 100 can continuously rotate under the driving of natural wind, so that the whole rotation of the darrieus wind wheel assembly 100 drives a machine core rotor in the generator 34 to continuously operate through the input shaft 22, and the effect of continuous power generation is achieved; under normal ambient wind speed, the darrieus wind wheel assembly 100 rotates normally, so that the rotating speed of the speed measuring disc 21 detected by the Hall rotating speed sensor 24 is normal, the electromagnetic power-off brake motor 41 is in a power-off state, and when the electromagnetic power-off brake motor 41 is powered off, the output shaft 19 of the electromagnetic power-off brake motor 41 is in a braking state; at the moment, the three darrieus type blades 1 rotate along the axis of a central shaft 12 of the darrieus wind wheel to generate an outward centrifugal force, so that each darrieus type blade 1 stably abuts against a limiting head 2 at the tail end of a horizontal supporting guide rod 6 under the action of the centrifugal force, each darrieus type blade 1 is positioned at the position farthest from the central shaft 12 of the darrieus wind wheel in the state, the torque of each darrieus type blade 1 to the central shaft 12 of the darrieus wind wheel is the largest, the generating efficiency is the highest in the state, the fastest rotating speed of the central shaft 12 of the darrieus wind wheel can be brought in the state under the same natural wind intensity, and meanwhile, the load of equipment is also the largest in the state;

in severe windy weather: the darrieus type wind wheel assembly 100 can rotate at an overspeed under the driving of natural wind, at the moment, the rotating speed of the darrieus type wind wheel assembly 100 exceeds the running load of the generator 34, if stall protection is not carried out, the risk of equipment damage can be caused, at the moment, the rotating speed of the speed measuring disc 21 detected by the Hall rotating speed sensor 24 is in an overspeed state, at the moment, the electromagnetic power-off brake motor 41 is immediately triggered, the output shaft 19 rotates in the positive direction, so that the output shaft 19 drives the involute gear 17 to rotate, the rotation of the involute gear 17 drives the transmission cylinder 26 to rotate under involute meshing, and the sliding displacement between the involute gear 17 and the transmission cylinder 26 along the axial direction is not influenced while the involute gear 17 and the transmission cylinder 26 are in mutual meshing transmission;

at the moment, the clockwise rotation of the transmission cylinder 26 can synchronously drive the rotating rod body 15 and the threaded rod 8 to rotate clockwise, and the clockwise rotation of the threaded rod 8 in the threaded hole 11 can continuously push the threaded rod 8 downwards; so that the integral structure formed by the transmission column 26, the rotating rod body 15 and the threaded rod 8 gradually moves downwards while rotating clockwise along the axis;

further, the first spiral winding section 15.1, the second spiral winding section 15.2 and the third spiral winding section 15.3 are gradually displaced downwards while rotating clockwise along the axis, so that the first spiral winding section 15.1, the second spiral winding section 15.2 and the third spiral winding section 15.3 are respectively spirally wound with a first overspeed protection rope 4.1, a second overspeed protection rope 4.2 and a third overspeed protection rope 4.3; as the first overspeed protection rope 4.1, the second overspeed protection rope 4.2 and the third overspeed protection rope 4.3 are spirally wound on the first spirally wound section 15.1, the second spirally wound section 15.2 and the third spirally wound section 15.3 respectively, so that the first overspeed protection rope 4.1, the second overspeed protection rope 4.2 and the third overspeed protection rope 4.3 respectively pull the first darrieus type blade 1.1, the second darrieus type blade 1.2 and the third darrieus type blade 1.3 inwards in a direction close to the central axis 12 of the darrieus wind wheel, so that the first darrieus type blade 1.1, the second darrieus type blade 1.2 and the third darrieus type blade 1.3 gradually move close to the central axis 12 of the darrieus wind wheel, thereby reducing the torque of the first darrieus type blade 1.1, the second darrieus type blade 1.2 and the third darrieus type blade 1.3 and realizing the purpose of reducing the rotational speed of the first darrieus type blade 1.1, the second darrieus type blade 1.2 and the third darrieus wind wheel 12, thereby reducing the operating load of the generator 34; when the rotating speed of the Darrieus type wind wheel assembly 100 is reduced to the rotating speed which can be borne by the generator 34, the electromagnetic power-off brake motor 41 is suspended, the output shaft 19 recovers the brake state, and the purpose of overspeed protection is achieved;

when the normal weather is recovered: only the output shaft 19 needs to rotate slowly in the reverse direction, the three darrieus type blades 1 automatically move away from the central shaft 12 of the darrieus wind wheel along the horizontal supporting guide rod 6 under the combined action of centrifugal force and the return spring 5, and finally, each darrieus type blade 1 stably abuts against the limiting head 2 at the tail end of the horizontal supporting guide rod 6 and is recovered to the state of optimal efficiency.

The above is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims (6)

1. Da lie type aerogenerator's overspeed protection mechanism, its characterized in that: comprises a Dalie wind wheel central shaft (12); the inside of the central shaft (12) of the Da lie wind wheel is a coaxial hollow cylindrical cavity (14), and a rotary rod body (15) is arranged in the hollow cylindrical cavity (14) coaxially and rotatably; a first outer edge (50), a second outer edge (51), a third outer edge (52) and a fourth outer edge (53) are arranged on the rotating rod body (15) at equal intervals from top to bottom, the rotating rod body (15) between the first outer edge (50) and the second outer edge (51) is a first spiral winding section (15.1), the rotating rod body (15) between the second outer edge (51) and the third outer edge (52) is a second spiral winding section (15.2), and the rotating rod body (15) between the third outer edge (52) and the fourth outer edge (53) is a third spiral winding section (15.3);

a first Darrieus type blade (1.1), a second Darrieus type blade (1.2) and a third Darrieus type blade (1.3) are distributed on the periphery of a central shaft (12) of the Darrieus wind wheel in a circumferential array manner; three threading holes (13) are hollowed in the wall body of the central shaft (12) of the Da lie wind wheel, and the Da lie wind wheel further comprises a first overspeed protection rope (4.1), a second overspeed protection rope (4.2) and a third overspeed protection rope (4.3) which respectively penetrate through the three threading holes (13);

one end of the first overspeed protection rope (4.1) is fixedly connected with one side, close to the central shaft (12) of the Darrieus wind wheel, of the first Darrieus type blade (1.1), and the other end of the first overspeed protection rope (4.1) is fixedly connected with the lower end of the first spiral winding section (15.1); one end of a second overspeed protection rope (4.2) is fixedly connected with one side, close to a Darrieus wind wheel central shaft (12), of a second Darrieus type blade (1.2), and the other end of the second overspeed protection rope (4.2) is fixedly connected with the lower end of a second spiral winding section (15.2); one end of a third overspeed protection rope (4.3) is fixedly connected with one side of the third Darrieus type blade (1.3) close to the central shaft (12) of the Darrieus wind wheel, and the other end of the third overspeed protection rope (4.3) is fixedly connected with the lower end of the third spiral winding section (15.3).

2. An overspeed protection mechanism of a darrieus wind generator according to claim 1, characterized in that: the top of the hollow column cavity (14) is a fixedly arranged threaded seat (10), a threaded hole (11) which is communicated up and down is formed in the threaded seat (10), and the threaded hole (11) and the hollow column cavity (14) are coaxially arranged; the upper end of the rotating rod body (15) is fixedly connected with a threaded rod (8) with the same axis, and the threaded rod (8) is in threaded fit with the threaded hole (11).

3. An overspeed protection mechanism of a darrieus wind generator according to claim 1, characterized in that: the lower section of the rotating rod body (15) is coaxially sleeved with a plurality of restraining sleeves (18), the rotating rod body (15) is in sliding fit with the inner walls of sleeve holes (30) of the restraining sleeves (18), and each restraining sleeve (18) is fixedly supported and connected with the inner wall of the hollow column cavity (14) through a restraining sleeve support (16).

4. An overspeed protection mechanism of a darrieus wind generator according to claim 3, characterized in that: three groups of blade supporting pieces are distributed on a central shaft (12) of the Da lie wind wheel in a circumferential array, the three groups of blade supporting pieces are respectively connected with the three Da lie type blades (1) in a supporting mode, and each group of blade supporting pieces comprises two horizontal supporting guide rods (6) which are distributed up and down; the upper part and the lower part of each Darrieus type blade (1) are provided with two transverse guide holes (3) in a hollow way, the two transverse guide holes (3) correspond to two horizontal support guide rods (6) of the corresponding blade supporting part, and the two horizontal support guide rods (6) respectively pass through the two guide holes (3) in a coaxial sliding way; the darrieus type blades (1) can slide along the length direction of the corresponding horizontal support guide rods (6).

5. An overspeed protection mechanism of a darrieus wind generator according to claim 4, characterized in that: each horizontal supporting guide rod (6) is coaxially sleeved with a return spring (5); two ends of the return spring (5) elastically press the darrieus blade (1) and the fixed disc body (9) respectively, and the return spring (5) always has an elastic pressing force towards the direction close to the limiting head (2) for the darrieus blade (1).

6. An overspeed protection mechanism of a darrieus wind generator according to claim 5, characterized in that: the overspeed protection rope (4) is made of nylon fiber with the diameter larger than 0.8cm, and the tensile resistance is not less than 1600 kg.

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