CN216078240U

CN216078240U - Speed change mechanism of wind driven generator

Info

Publication number: CN216078240U
Application number: CN202121951252.4U
Authority: CN
Inventors: 陈俊
Original assignee: Jiangxi China Power Investment New Energy Power Generation Co ltd
Current assignee: Jiangxi China Power Investment New Energy Power Generation Co ltd
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2022-03-18
Anticipated expiration: 2031-08-19

Abstract

A wind driven generator speed change mechanism is provided, wherein a plurality of air bleed ports and a plurality of air exhaust ports are arranged on the circumferential array of a cabin wall of a cabin, and a gearbox and a generator in transmission connection with the gearbox are arranged in the air bleed ports and the air exhaust ports; a gear ring is sleeved in a box shell of the gearbox, a sun wheel and a plurality of planet wheels are arranged in the center of the gear ring, a plurality of air guide holes in a circumferential array are formed in the gear ring, one end of each air guide hole is connected with an air guide port, and the other end of each air guide hole is connected with an air exhaust port. After the blades of the wind wheel shaft, the gear box and the wind power transmission system of the generator are started, partial air flow enters the air guide holes along with the air inlet and the air pipe, and as the heat of each part of the planetary transmission system is uniformly diffused along with the circumferential array distribution of the planetary transmission system, the heat is conducted to the coaxially assembled box shell by the heat-conducting silicone grease, and then the heat is taken away by the air flow in the air guide holes distributed in the circumferential array and is discharged through the air outlet, so that the thermal deformation caused by the local temperature difference of the speed change mechanism is effectively inhibited by the manufacturing structure with central symmetry and the coaxial heat-radiating air guide structure, and the smooth operation of the access of the gearbox to the grid-connected wind power system is ensured.

Description

Speed change mechanism of wind driven generator

Technical Field

The utility model belongs to the technical field of grid-connected wind power generation, and particularly relates to a speed change mechanism of a wind driven generator.

Background

The grid-connected wind generating set is a wind generating system which is connected with a power grid and used for transmitting active power to the power grid. The process is that the received wind power energy is converted into high-voltage direct current, and then the high-voltage direct current is inverted by an inverter to output sinusoidal alternating current with the same frequency and phase as the voltage of the power grid to the power grid. Due to the wind energy characteristic, wind power has high randomness, volatility and anti-peak-shaving characteristic, when the wind power is in butt joint with a grid-connected system, the wind power can cause frequent interference on the stability of a power grid, and the power grid is easy to generate unattenuated low-frequency oscillation after being subjected to large interference or small interference, so that the instability of the power system is finally caused, and therefore the stability of the running of a fan in a wind turbine generator set is closely related to the quality of the power grid. And the gearbox in the fan is very easy to cause deformation and abrasion due to higher operating temperature caused by uninterrupted operation, so that the gearbox needs to be periodically manually disassembled and maintained, otherwise, the transmission quality of a grid-connected system is adversely affected. The wind turbine generator is usually installed in remote areas with rare occurrence, high labor cost is needed when the field maintenance is frequently carried out, and the popularization and application of the wind turbine technology in a grid-connected system are not facilitated.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a speed change mechanism of a wind driven generator, which is used for reducing the maintenance cost of the speed change mechanism of a wind power system and ensuring the butt joint stability of a grid-connected system and the wind power system.

The utility model is implemented by the following technical scheme: a speed change mechanism of a wind driven generator comprises a cabin, a gearbox, a generator, a plurality of air pipes and a wind wheel shaft. The engine room is a hollow cavity, the front end and the rear end of the cabin wall of the engine room are respectively provided with a plurality of air-entraining ports and a plurality of air exhaust ports in a circumferential array mode, and the transmission case and the generator in transmission connection with the transmission case are arranged in the engine room; a gear ring is sleeved in a box shell of the gearbox in a sleeved mode, a sun gear is arranged in the center of the gear ring, a plurality of planet gears are meshed with outer teeth of the sun gear in a circumferential array mode, the outer teeth of the planet gears are meshed with inner teeth of the gear ring at the same time, in addition, the planet gears are connected to an annular planet carrier together, the planet carrier is connected with a wind wheel shaft led in from the outside of the cabin through an input shaft of the gearbox, and the sun gear is connected with a motor shaft of a generator through an output shaft of the gearbox; the gear ring thickness direction runs through the air guide hole that is equipped with a plurality of circumference array distributions, the one end of air guide hole is passed through the pipe with the bleed mouth is connected, the other end pass through another trachea with the gas vent is connected.

Furthermore, the air inlet direction of the air bleed port is the same as the air inducing direction of the wind wheel blades connected with the wind wheel shaft, and the exhaust direction of the exhaust port is opposite to the air inlet direction of the air bleed port.

Further, the case shell is a cylindrical barrel, and the axis of the barrel is coincided with the center of the gear ring.

Furthermore, heat-conducting silicone grease is filled in a fit gap between the box shell and the gear ring.

The utility model has the beneficial effects that: the device utilizes the planetary gear transmission mechanism and the air channel system of the air guide hole in the gearbox to form a heat dissipation effect aiming at the speed change part, when blades of a wind wheel shaft, the gear box and a wind power transmission system of a generator are started, partial air flow enters the air guide hole along with the air guide hole and the air pipe, because heat of each part of the planetary transmission system is uniformly diffused along with the circumferential array distribution of the heat, the heat is conducted to the box shell of the coaxial assembly by virtue of the heat-conducting silicone grease, then the heat is taken away by the air flow in the air guide hole distributed by the circumferential array and is discharged through the air exhaust hole, the thermal deformation caused by the local temperature difference of the speed change mechanism is effectively inhibited by the manufacturing structure and the coaxial heat-radiating air guide structure which are symmetrical in the center, the smooth operation of the gearbox connected with the grid wind power system is ensured, the manual maintenance times and the maintenance cost are effectively reduced, and the device has better practical value.

Drawings

FIG. 1 is a side view of the structure of the present invention;

FIG. 2 is a front view of the internal structure of the present invention;

in the figure: 1-engine room, 2-gear box, 2 a-box shell, 2 b-gear ring, 2 c-sun gear, 2 d-planet gear, 2 e-planet carrier, 2 f-air guide hole, 3-generator, 3 a-motor shaft, 4-air pipe and 5-air wheel shaft.

Detailed Description

The utility model is described in further detail below with reference to the drawings.

As shown in fig. 1-2, a speed change mechanism of a wind driven generator 3 comprises a nacelle 1, a gearbox 2, a generator 3, a plurality of air pipes 4 and a wind wheel shaft 5. The engine room 1 is a hollow cavity, the front end and the rear end of the cabin wall of the engine room are respectively provided with a plurality of air-entraining ports and a plurality of air exhaust ports in a circumferential array mode, and the transmission case 2 and the generator 3 in transmission connection with the transmission case are arranged in the engine room; a gear ring 2b is coaxially sleeved in a cylindrical box shell 2a of the gearbox 2, heat-conducting silicone grease is filled in a sleeved gap, a sun gear 2c is arranged in the center of the gear ring 2b, external teeth of the sun gear 2c are meshed with a plurality of planet gears 2d in a circumferential array mode, external teeth of the planet gears 2d are simultaneously meshed with internal teeth of the gear ring 2b, in addition, the planet gears 2d are jointly connected to an annular planet carrier 2e, the planet carrier 2e is connected with an air wheel shaft 5 led in from the outside of the engine room 1 through an input shaft of the gearbox 2, and the sun gear 2c is connected with a motor shaft 3a of the generator 3 through an output shaft of the gearbox 2; the thickness direction of the gear ring 2b is provided with a plurality of air guide holes 2f distributed in a circumferential array in a penetrating mode, one end of each air guide hole 2f is connected with the air guide port through the corresponding conduit, and the other end of each air guide hole is connected with the corresponding air exhaust port through the corresponding air pipe 4. The air inlet direction of the air bleed port is the same as the air inducing direction of the wind wheel blades connected with the wind wheel shaft 5, and the exhaust direction of the air exhaust port is opposite to the air inlet direction of the air bleed port.

The working principle of the utility model is as follows:

when a wind wheel shaft 5 of the device is connected with a wind blade and wind power conversion operation from the wind wheel shaft 5, a gearbox 2 and a generator 3 to a grid-connected system is carried out, the gearbox 2 accelerates by using a planetary gear system consisting of a gear ring 2b, a sun wheel 2c and a planet wheel 2d of the gearbox, so that the low rotating speed of the wind wheel shaft 5 is converted into the high rotating speed of a motor shaft 3a, in the period, as the grid-connected system needs continuous uninterrupted operation of the generator 3 and the gearbox, mutual friction among the gear ring 2b, the planet wheel 2d and the sun wheel 2c causes local heating of the generator, and as the planet wheels 2d are distributed in a circumferential array, local friction heat storage borne by the gear ring 2b is uniformly dispersed to each area along with the revolution of the planet gear array, and meanwhile, friction heat storage of the planet gear and the sun wheel 2c is also dispersed along with the relative revolution of the planet gear. Along with the uniform diffusion of heat outwards, the heat is uniformly conducted to the shell of the box shell 2a under the full contact of the outer edge of the gear ring 2b and the heat-conducting silicone grease; meanwhile, the external wind pressure accompanying the wind power system is formed from left to right (the direction is according to the figure 1), partial airflow is led in from the induction port and enters the air guide holes 2f through the air pipe 4, and due to the uniform array distribution of the air guide holes 2f on the box shell 2a, the airflow uniformly takes heat out after passing through the circumferential array of the air guide holes 2f and is released from the exhaust port, so that the local thermal deformation degree of each component in the gearbox 2 is reduced, and the stable operation of the wind power speed change system and the grid-connected system is guaranteed.

The above description is only one of the embodiments of the present invention, and is not intended to limit the scope of the present invention, and it should be noted that other modifications and substitutions by those skilled in the art may be made without departing from the scope of the present invention as set forth in the appended claims.

Claims

1. The utility model provides a aerogenerator speed change mechanism, includes cabin, gearbox, generator, a plurality of trachea, wind wheel axle, its characterized in that: the cabin is a hollow cavity, the front end and the rear end of the cabin wall are respectively provided with a plurality of air-entraining ports and a plurality of air exhaust ports in a circumferential array mode, meanwhile, the gearbox and the generator in transmission connection with the gearbox are arranged in the gearbox, a gear ring is sleeved in the casing of the gearbox, the center of the gear ring is provided with a sun wheel, the outer teeth of the sun wheel are meshed with a plurality of planet wheels in a circumferential array mode, simultaneously, the outer teeth of a plurality of planet wheels are meshed with the inner teeth of the gear ring at the same time, in addition, the planet wheels are connected with an annular planet carrier together, the planet carrier is connected with the wind wheel shaft led in from the outside of the engine room through the input shaft of the gear box, the sun wheel is connected with the motor shaft of the generator through the output shaft of the gear box, a plurality of air guide holes distributed in a circumferential array are arranged in a penetrating way in the thickness direction of the gear ring, one end of the air guide hole is connected with the air guide port through a guide pipe, and the other end of the air guide hole is connected with the air exhaust port through another air pipe.

2. A wind turbine transmission mechanism as claimed in claim 1, wherein: the air inlet direction of the air bleed port is the same as the air inducing direction of the wind wheel blades connected with the wind wheel shaft, and the exhaust direction of the air exhaust port is opposite to the air inlet direction of the air bleed port.

3. A wind turbine transmission mechanism as claimed in claim 1, wherein: the case shell is a cylindrical barrel, and the axis of the barrel is coincided with the center of the gear ring.

4. A wind turbine transmission mechanism as claimed in claim 1, wherein: and heat-conducting silicone grease is filled in a fit gap between the box shell and the gear ring.