阅读说明：本技术 一种离心式风力发电机的制动闸 (Brake of centrifugal wind driven generator ) 是由 曾凡鑫 于 2021-09-14 设计创作，主要内容包括：本发明涉及风力发电机制动技术领域,且公开了一种离心式风力发电机的制动闸,包括转轴、轴套、安装块和电动推杆,所述轴套的内侧壁与安装块的对应处固定连接有摩擦层,所述轴套的侧壁位于摩擦层处的内部固定设有热敏电阻。本发明通过设计安装块、摩擦块、摩擦层、热敏电阻和电动推杆,通过转轴的转速高于额定转速时,使得安装块上的摩擦块受离心力并作用在摩擦层上,通过摩擦块与摩擦层之间摩擦所产生的热量促使热敏电阻的阻减小,从而使得电动推杆带动上制动块作用在下制动块上,通过上制动块与下制动块之间的摩擦对转轴实现减速制动,从而避免因恶劣天气导致转轴转速高于额定转速,造成发电设备的损坏。(The invention relates to the technical field of wind driven generator braking, and discloses a brake of a centrifugal wind driven generator, which comprises a rotating shaft, a shaft sleeve, an installation block and an electric push rod, wherein a friction layer is fixedly connected to the corresponding position of the inner side wall of the shaft sleeve and the installation block, and a thermistor is fixedly arranged inside the position, located at the friction layer, of the side wall of the shaft sleeve. According to the invention, through designing the mounting block, the friction layer, the thermistor and the electric push rod, when the rotating speed of the rotating shaft is higher than the rated rotating speed, the friction block on the mounting block is subjected to centrifugal force and acts on the friction layer, the resistance of the thermistor is reduced through heat generated by friction between the friction block and the friction layer, so that the electric push rod drives the upper brake block to act on the lower brake block, and the rotating shaft is decelerated and braked through the friction between the upper brake block and the lower brake block, thereby avoiding the damage of power generation equipment caused by the fact that the rotating speed of the rotating shaft is higher than the rated rotating speed due to severe weather.)

1. The utility model provides a centrifugal aerogenerator's brake, includes pivot (1), axle sleeve (2), installation piece (4) and electric putter (5), its characterized in that: a friction layer (21) is fixedly connected to a corresponding position of the inner side wall of the shaft sleeve (2) and the mounting block (4), a thermistor (22) is fixedly arranged inside the position, located at the friction layer (21), of the side wall of the shaft sleeve (2), a ball groove (23) is fixedly formed in the middle of the lower side wall of the friction layer (21), a sliding groove (41) is formed in the mounting block (4), a partition plate (42) is fixedly connected to the middle of the sliding groove (41), a spring (43) is fixedly connected to the upper side of the partition plate (42), a friction block (44) is fixedly connected to the top of the spring (43), a through groove (441) is formed in the friction block (44), a placing groove (442) is formed in the upper side of the through groove (441) in the interior of the friction block (44), a buffer ball (443) is placed in the placing groove (442), and a connecting rod (45) is fixedly connected to the bottom of the friction block (44) and located at the inner side of the spring (43), an air groove (451) is formed in the connecting rod (45), an air bag (46) is fixedly connected to the upper side, penetrating through one end of the partition plate (42), of the connecting rod (45), and the top of the air bag (46) is fixedly connected with the bottom of the partition plate (42).

2. The brake of a centrifugal wind turbine according to claim 1, wherein: the thermistor (22) is a negative temperature coefficient resistor, namely, the higher the temperature, the smaller the resistance value is, and the lower the temperature, the larger the resistance value is.

3. The brake of a centrifugal wind turbine according to claim 1, wherein: the thermistor (22) controls the resistance value of the current required by the electric push rod (5), and the heat required by the thermistor (22) for changing the resistance is generated by the friction between the friction layer (21) and the friction block (44).

4. The brake of a centrifugal wind turbine according to claim 1, wherein: the lower opening of the air groove (451) is communicated with the opening of the air bag (46), and the upper opening of the air groove (451) is communicated with the lower opening of the through groove (441).

5. The brake of a centrifugal wind turbine according to claim 1, wherein: the diameter of the buffer ball (443) is smaller than that of the placing groove (442), and a complete circular groove is formed between the placing groove (442) and the ball groove (23) when the friction block (44) is contacted with the friction layer (21).

6. The brake of a centrifugal wind turbine according to claim 1, wherein: the centrifugal force generated by the rotating shaft (1) at the maximum rated rotating speed is the same as the elastic potential energy of the spring (43).

Technical Field

The invention relates to the technical field of braking of wind driven generators, in particular to a brake of a centrifugal wind driven generator.

Background

With the rapid development of energy conservation and environmental protection, solar energy, wind energy, geothermal energy and the like are called as new energy sources for sustainable development, and because the new energy sources are used without pollution, the new energy sources are widely applied, and wind power generation is one of the more extensive and mature technologies and receives high attention from all countries in the world.

Wind power generation is an electric power device that converts wind energy into mechanical energy to rotate a generator rotor, and finally outputs alternating current, it mainly drives the rotating blades to rotate through wind power, the rotating blades convert the wind power into mechanical energy and then drive the rotating shaft to rotate, the generator is driven to rotate by the rotating shaft so as to obtain electric energy, but the wind power cannot be manually controlled, in severe weather and heavy wind, the brake is often required to be manually and remotely controlled, so that the rotating speed of the rotating shaft is reduced, otherwise, the rotating shaft rotates rapidly under the action of heavy wind, the generator is easy to be burnt out under the action of the speed increasing mechanism, so that the wind power generation tower is damaged, unnecessary loss is caused, and when the power generation equipment is in severe weather, the remote control failure condition is easy to occur due to the fact that the signals are limited and sent out, so that the operator misses the optimal speed regulation time, and the power generation equipment is damaged.

Disclosure of Invention

Aiming at the defects of the brake of the existing wind driven generator in the background technology in the using process, the invention provides the brake of the centrifugal wind driven generator, which has the advantages of braking when the rotating speed of a rotating shaft is greater than the rated rotating speed, avoiding the damage of generating equipment and solving the technical problems in the background technology.

The invention provides the following technical scheme: a brake of a centrifugal wind driven generator comprises a rotating shaft, a shaft sleeve, an installation block and an electric push rod, wherein a friction layer is fixedly connected to the corresponding position of the inner side wall of the shaft sleeve and the installation block, a thermistor is fixedly arranged inside the position, located at the friction layer, of the side wall of the shaft sleeve, a ball groove is fixedly formed in the middle of the lower side wall of the friction layer, a sliding groove is formed in the installation block, a partition plate is fixedly connected to the middle of the sliding groove, a spring is fixedly connected to the upper side of the partition plate, the top of the spring is fixedly connected with a friction block, a through groove is formed in the friction block, a placement groove is formed in the position, located at the upper side of the through groove, of the friction block, a buffer ball is placed in the placement groove, a connecting rod is fixedly connected to the inner side, located at the inner side of the spring, of the bottom of the friction block, an air groove is formed in the connection rod, and an air bag is fixedly connected to the upper side, where the connecting rod penetrates through one end of the partition plate, the top of the air bag is fixedly connected with the bottom of the partition plate.

Preferably, the thermistor is a negative temperature coefficient resistor, that is, the resistance value is smaller when the temperature is higher, and the resistance value is larger when the temperature is lower.

Preferably, the thermistor controls a resistance value of a current required by the electric push rod, and the heat required by the thermistor to change the resistance is generated by friction between the friction layer and the friction block.

Preferably, the lower opening of the air groove is communicated with the opening of the air bag, and the upper opening of the air groove is communicated with the lower opening of the through groove.

Preferably, the diameter of the buffer ball is smaller than that of the placing groove, and a complete circular groove is formed between the placing groove and the ball groove when the friction block is in contact with the friction layer.

Preferably, the centrifugal force generated at the maximum rated rotating speed of the rotating shaft is the same as the elastic potential energy of the spring.

The invention has the following beneficial effects:

1. according to the invention, through designing the mounting block, the friction layer, the thermistor and the electric push rod, when the rotating speed of the rotating shaft is higher than the rated rotating speed, the friction block on the mounting block is subjected to centrifugal force and acts on the friction layer, the resistance of the thermistor is reduced through heat generated by friction between the friction block and the friction layer, so that the electric push rod drives the upper brake block to act on the lower brake block, and the rotating shaft is decelerated and braked through the friction between the upper brake block and the lower brake block, thereby avoiding the damage of power generation equipment caused by the fact that the rotating speed of the rotating shaft is higher than the rated rotating speed due to severe weather.

2. According to the invention, through designing the sliding groove, the partition plate, the air bag, the connecting rod, the placing groove, the buffer ball and the ball groove, when the rotating speed of the rotating shaft is higher than the rated rotating speed, the friction block is acted on the friction layer under the centrifugal force, the air bag is extruded through the connecting rod, so that the air in the air bag is extruded into the air groove and enters the placing groove through the through groove, the buffer ball is positioned at the topmost end of the placing groove, the friction between the friction block and the friction layer is buffered through the action between the buffer ball and the ball groove, the phenomenon that the rotating shaft is damaged or broken due to larger torsion force caused by sudden braking of the rotating shaft when the rotating shaft is braked is avoided, and the service life of the rotating shaft is prolonged.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the cross-sectional internal structure of the friction block of the present invention;

FIG. 3 is a schematic structural view of the friction block of FIG. 2 in a contact state with a friction layer according to the present invention;

FIG. 4 is a schematic view of the internal structure of the section of the shaft sleeve electric push rod of the present invention;

FIG. 5 is a schematic view of the internal structure of the friction block of the present invention;

FIG. 6 is a schematic view of the structure at the friction layer of the present invention;

FIG. 7 is an enlarged view of the structure at A in FIG. 1 according to the present invention.

In the figure: 1. a rotating shaft; 2. a shaft sleeve; 21. a friction layer; 22. a thermistor; 23. a ball groove; 3. a blade; 4. mounting blocks; 41. a chute; 42. a partition plate; 43. a spring; 44. a friction block; 441. a through groove; 442. a placement groove; 443. a buffer ball; 45. a connecting rod; 451. an air tank; 46. an air bag; 5. an electric push rod; 6. an upper brake pad; 7. and a lower brake pad.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a brake of a centrifugal wind power generator includes a rotating shaft 1, a shaft sleeve 2 is movably sleeved outside the rotating shaft 1, the rotating shaft 1 can rotate inside the shaft sleeve 2, the shaft sleeve 2 is fixed inside the wind power generator, a blade 3 is fixedly connected to a top end of the rotating shaft 1, the blade 3 rotates by wind power to drive the rotating shaft 1 to rotate, so that the rotating shaft 1 drives the generator to generate electricity through a speed increasing mechanism, a mounting block 4 is fixedly sleeved outside the rotating shaft 1 inside the shaft sleeve 2, the mounting block 4 is welded outside the rotating shaft 1 in the circumferential direction, an electric push rod 5 is fixedly connected to a left side of the mounting block 4 on an inner side wall of the shaft sleeve 2, the number of the electric push rods 5 is six, the six electric push rods 5 are uniformly distributed on an inner wall of the shaft sleeve 2, an upper brake block 6 is fixedly connected to a top end of the electric push rod 5, a lower brake block 7 is fixedly sleeved on a left side of the mounting block 4 on an outer side wall of the rotating shaft 1, the lower brake shoe 7 is positioned corresponding to the upper brake shoe 6, and the rotation shaft 1 is decelerated and braked by friction between the upper brake shoe 6 and the lower brake shoe 7.

Referring to fig. 1, 2, 3 and 6, a friction layer 21 is fixedly connected to a corresponding position of the inner side wall of the shaft sleeve 2 and the mounting block 4, the friction layer 21 is fixedly welded to the circumferential inner wall of the shaft sleeve 2 and corresponds to the position of the mounting block 4, a thermistor 22 is fixedly arranged inside the side wall of the shaft sleeve 2 at the position of the friction layer 21, the thermistor 22 is a negative temperature coefficient resistor, that is, the higher the temperature is, the smaller the resistance value is, the lower the temperature is, the larger the resistance value is, the heat generated by friction between the friction block 44 and the friction layer 21 is ensured to increase the resistance value of the thermistor 22, so as to cause the electric push rod 5 to work, ball grooves 23 are fixedly formed in the middle of the lower side wall of the friction layer 21, the number of the ball grooves 23 is twelve, and the twelve ball grooves 23 are uniformly distributed on the friction layer 21.

Referring to fig. 1, 2, 3, 5 and 7, a sliding groove 41 is formed in the mounting block 4, a partition plate 42 is fixedly connected to the middle of the sliding groove 41, a spring 43 is fixedly connected to the upper side of the partition plate 42, a centrifugal force generated at the maximum rated rotation speed of the rotating shaft 1 is the same as an elastic potential energy of the spring 43, so that the rotating shaft 1 is prevented from being braked when rotating at the rated rotation speed, and stable operation of the power generation equipment is ensured, a friction block 44 is fixedly connected to the top of the spring 43, the thermistor 22 controls a resistance value of a current required by the electric push rod 5, heat required by the thermistor 22 to change the resistance is generated by friction between the friction layer 21 and the friction block 44, and it is ensured that the thermistor 22 controls the electric push rod 5 to decelerate and brake the rotating shaft 1 by using the heat generated by friction when the rotation speed of the rotating shaft 1 is higher than the rated rotation speed, a through groove 441 is formed in the friction block 44, the inside of the friction block 44 is located at the upper side of the through groove 441 and is provided with a placing groove 442, the through groove 441 is communicated with the placing groove 442 to ensure that gas can enter the placing groove 442 and jack up the buffer ball 443 to be matched with the ball groove 23, the inside of the placing groove 442 is provided with a buffer ball 443, the diameter of the buffer ball 443 is smaller than that of the placing groove 442, a complete circular groove is formed between the placing groove 442 and the ball groove 23 when the friction block 44 is contacted with the friction layer 21, the buffer ball 443 is ensured to be buffered when the friction block 44 is rotated under the action between the buffer ball 443 and the ball groove 23, the upper part of the buffer ball 443 is located inside the ball groove 23 when the friction block 44 is contacted with the friction layer 21, the bottom of the friction block 44 is located inside the spring 43, the connecting rod 45 is internally provided with a gas groove 451, the connecting rod 45 passes through the upper side of one end of the partition plate 42 and is fixedly connected with the gas bag 46, the connecting rod 45 and the partition plate 42 are connected in a sleeved mode, the connecting rod 45 can move back and forth through a hole in the middle of the partition plate 42, the lower opening of the air groove 451 is communicated with the opening of the air bag 46, the upper opening of the air groove 451 is communicated with the lower opening of the through groove 441, it is guaranteed that air can enter the placing groove 442 through the air groove 451 and the through groove 441 when the air bag 46 is extruded by the connecting rod 45, the top of the air bag 46 is fixedly connected with the bottom of the partition plate 42, and the opening in the bottom side of the air bag 46 corresponds to and is communicated with the air groove 451.

Referring to fig. 1-7, when the rotating speed of the rotating shaft 1 on the wind power generating device is higher than the rated rotating speed, the centrifugal force generated by the rotating speed is larger than the potential energy of the spring 43, so that the friction block 44 moves to the outer side of the rotating shaft 1 under the action of the centrifugal force and rubs with the friction layer 21 to generate heat, the thermistor 22 reduces the resistance value due to the heat to actuate the electric push rod 5 and drive the upper brake block 6 to act on the lower brake block 7, the friction force generated between the upper brake block 6 and the lower brake block 7 performs friction deceleration braking on the rotating shaft 1, thereby avoiding the heating of the rotating shaft 1 or the damage of the generating device due to the rotating speed of the rotating shaft 1 being higher than the rated rotating speed, and due to the arrangement of the air bag 46, the friction block 44 drives the connecting rod 45 to press the air bag 46 when moving to the outer side of the rotating shaft 1 under the centrifugal force, so that the air inside the air bag 46 is squeezed into the placing groove 442 through the air groove 451 and the through groove 441, the buffering ball 443 is urged to move upwards to the top of the placing groove 442, and through the action and the cooperation between one end of the buffering ball 443 extending out of the placing groove 442 and the ball groove 23 on the friction layer 21, the buffering is achieved when the rotating shaft 1 is braked, and the rotating shaft 1 is prevented from being damaged or broken due to the fact that the rotating shaft 1 is suddenly braked to form large torsion force, so that the service life of the rotating shaft 1 is influenced.

The use method (working principle) of the invention is as follows:

firstly, when the rotating speed of the rotating shaft 1 is within the rated rotating speed range, the centrifugal force generated by the rotating shaft 1 cannot overcome the potential energy of the spring 43, so that the brake does not work, and therefore the rotating shaft 1 is normally used, secondly, when the rotating speed of the rotating shaft 1 is higher than the rated rotating speed, the friction block 44 overcomes the potential energy of the spring 43, moves to the outer side of the rotating shaft 1 and acts on the friction layer 21 through the centrifugal force generated by the rotating shaft 1, the heat is generated through the friction between the friction block 44 and the friction layer 21, the resistance value of the thermistor 22 is reduced, so that the electric push rod 5 works, the electric push rod 5 drives the upper brake block 6 to move and act on the lower brake block 7, the rotating shaft 1 is subjected to deceleration braking through the friction force between the upper brake block 6 and the lower brake block 7, meanwhile, the connecting rod extrudes the air bag 46 through the movement of the friction block 44, and gas is transmitted to the inside the placing groove 442 through the air groove 451 and the through groove 441, the buffer ball 443 moves upward and partially protrudes out of the placement groove 442, and the buffer ball 443 is matched with the ball groove 23 due to the rotation of the friction block 44 through the arrangement of the ball groove 23, so that the buffer effect is achieved, and the damage or the breakage of the rotating shaft 1 caused by the large torsion generated when the rotating shaft 1 brakes is avoided.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

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