CN203847323U - Dual-duct type horizontal shaft breeze wind turbine - Google Patents

Abstract

The utility model discloses a double-duct type horizontal shaft breeze wind machine, which comprises a generator, a horizontal shaft, a bracket, a horizontal rotating bearing, a rotating blade, an outer duct, an inner duct, a wheel hub, guide vanes and a vortex generating device. A plurality of guide vanes are evenly distributed along the axis of the hub, and the lower ends of the guide vanes are fixedly connected to the hub, and the upper ends of the plurality of guide vanes are connected to the inner wall of the inner channel, and the hub is arranged at the air inlet end of the inner channel. The vortex generating device is installed outside the air outlet of the inner duct, the inner duct is arranged in the outer duct, and the rotating blade is installed at the air outlet of the inner duct and is located downstream of the guide vane. The utility model introduces the gas outside the wind turbine into the rear side of the wind turbine by means of an external duct, and generates axisymmetrically distributed flow direction and spanwise vortices after the vortex generating device, so as to generate suction for the low-speed gas of the wind turbine , increasing the pressure difference between the front and back of the wind turbine, and improving the utilization rate of wind energy for the breeze level.

Description

Double Ducted Horizontal Axis Breeze Wind Turbine

technical field

The utility model relates to a breeze wind machine, in particular to a double-duct type horizontal axis breeze wind machine.

Background technique

A wind turbine is a thermal energy utilization engine that uses the sun as a heat source and the atmosphere as a working medium. It is a power device that uses airflow to push blades to obtain wind energy and convert it into useful mechanical energy or electrical energy at the same time. Wind energy is renewable. , Pollution-free natural energy is highly valued by people; but theoretically, the limit efficiency of aerodynamic conversion (ie Betz limit) is 59.3%, the wind energy utilization rate of traditional wind turbines is about 30-45%, and low-speed wind turbines are about 30-45%. 10-30%, wind turbines are often idling or generate very little power at low speeds. In terms of wind energy utilization at the breeze level (3-4m/s), the current wind energy utilization rate of wind turbines at home and abroad is even lower.

Utility model content

The purpose of this utility model is to provide a double-duct type horizontal axis breeze wind machine for the breeze level in order to solve the above problems.

The utility model realizes above-mentioned purpose through following technical scheme:

The utility model comprises a generator, a horizontal shaft, a bracket, a horizontal rotating bearing and a rotating blade. The rotating blade is connected with the generator through a horizontal shaft and installed on the bracket. The horizontal rotating bearing is installed on the In the bracket, the wind turbine also includes an outer duct, an inner duct, a hub, guide vanes and a vortex generating device, a plurality of guide vanes are evenly distributed along the axis of the hub, and the guide vanes The lower ends are all fixedly connected to the hub, the upper ends of the plurality of guide vanes are connected to the inner wall of the inner channel, the hub is arranged at the air inlet end of the inner channel, and the vortex generating device is installed on the inner channel. The outer side of the air outlet end of the inner duct, the inner duct is arranged in the outer duct, and the central axis of the inner duct and the outer duct is at the same horizontal position, and the rotating blade is installed on the inner duct at the air outlet and downstream of the guide vanes.

The airflow passing through the inner passage passes through the guide vane and enters the flow passage of the rotating blade, pushing the rotating blade to rotate. The airflow entering from the outer passage is mixed with the airflow of the inner passage after rotating the blade, and the vortex generating device makes it generate a circle along the circumferential direction. The axisymmetrically distributed vortices take away the low-speed fluid downstream of the rotor blades, reduce the pressure in the downstream area of the rotor blades, thereby increasing the pressure difference between the front and rear of the rotor blades, and increase the enthalpy drop of the airflow passing through the wind turbine, thereby improving the utilization rate of wind energy.

Specifically, the middle part of the inner wall of the outer duct and the air outlet end are fixedly connected to the outer wall of the inner duct by setting a plurality of ribs parallel to the horizontal axis, and the outer wall of the outer duct is connected to the support .

Preferably, the rotating blade is a rotating blade twisted along the blade height direction.

Specifically, the vortex generating device is composed of 10 petal-shaped deflectors distributed axially symmetrically along the circumferential direction of the inner channel with stacked edges.

The beneficial effects of the utility model are:

The utility model double-duct type horizontal axis breeze wind machine introduces the gas outside the wind machine into the rear side of the wind machine by means of the external duct, and generates axisymmetric distribution of flow direction and span direction vortex after the vortex generating device, so as to The low-speed gas of the wind turbine produces suction, which increases the pressure difference between the front and rear of the wind turbine and improves the utilization rate of wind energy for the breeze level.

Description of drawings

Figure 1 is a schematic diagram of the installation of the double-duct horizontal-axis breeze wind turbine described in the present invention;

Fig. 2 is the front view of the double-duct horizontal axis breeze wind turbine described in the utility model;

Fig. 3 is a side view of Fig. 2;

Fig. 4 is a front view of the inner channel and the vortex generating device of the present invention;

Fig. 5 is a side view of Fig. 4;

Fig. 6 is an installation front view of the guide vane and the rotating vane of the present invention;

Fig. 7 is a side view of Fig. 6;

Fig. 8 is a front view of the rotor blade of the present invention;

FIG. 9 is a side view of FIG. 8 .

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figures 1 to 9, the utility model double-duct horizontal-axis breeze wind turbine includes a generator 6, a horizontal shaft 3, a bracket 7, a horizontal rotating bearing 8, an outer duct 5, an inner duct 4, and a hub 11 , guide vane 1, rotating vane 2 twisted and shaped along the blade height direction, and a vortex generating device 9 composed of 10 petal-shaped guide vanes stacked in axisymmetrically distributed edges along the circumferential direction of the inner channel 4, rotating horizontally The bearing 8 is installed in the bracket 7, the rotating blade 2 is connected with the generator 6 through the horizontal shaft 3, and is arranged at the air outlet of the inner channel 4 and is located downstream of the guide vane 1, and the hub 11 is arranged at the air inlet end of the inner channel 4 , a plurality of guide vanes 1 are evenly distributed along the axis of the hub 11, and the lower ends of the guide vanes 1 are fixedly connected to the hub 11, and the upper ends of the plurality of guide vanes 1 are connected to the inner wall of the inner channel 4, the vortex generating device 9 is installed on the outside of the air outlet end of the inner duct 4, the inner duct 4 is set in the outer duct 5, and the central axis of the inner duct 4 and the outer duct 5 are at the same horizontal position, the middle part of the inner wall of the outer duct 5 and the air outlet end A plurality of ribs parallel to the horizontal axis 3 are fixedly connected to the outer wall of the inner duct 4 , and the outer wall of the outer duct 5 is connected to the bracket 7 .

The working principle of the utility model double-duct horizontal axis breeze wind machine is as follows:

When the wind turbine is working, the airflow passing through the inner channel 4 passes through the guide vane and enters the flow channel of the rotor blade 2, pushing the rotor blade 2 to rotate and do work, and at the same time the air velocity decreases; while the airflow entering the convergent outer channel 5 passes through the outer channel The acceleration of the duct 5 has a relatively high wind speed. After the air flows through the outer duct 5 and the vortex generating device 9 located downstream of the outer duct 5 and installed at the air outlet of the inner duct 4, it mixes with the airflow flowing out of the inner duct 4. On the one hand, the high-speed airflow in the outer duct 5 will carry the low-speed airflow downstream of the rotor blade 2 in the inner duct 4; A vortex is generated at the interface and develops downstream. While reducing the downstream pressure of the outer duct 5, it further reduces the pressure in the downstream area of the inner duct 4 and the rotor blade 2, increases the pressure difference between the front and rear of the rotor blade 2, and improves the passageway. The wind turbine contains the enthalpy drop of the airflow, which improves the utilization rate of wind energy at the breeze level and realizes the efficient conversion of wind energy to mechanical energy at low wind speeds.

The technical solution of the utility model is not limited to the limitations of the above-mentioned specific embodiments, and any technical deformation made according to the technical solution of the utility model falls within the protection scope of the utility model.

Claims (4)

1. A double-duct type horizontal shaft breeze wind machine, comprising a generator, a horizontal shaft, a support, a horizontal rotary bearing and a rotating blade, the rotating blade is connected with the generator through a horizontal shaft, and is installed on the support Above, the horizontal rotation bearing is installed in the bracket, which is characterized in that it also includes an outer duct, an inner duct, a hub, guide vanes and a vortex generating device, and a plurality of guide vanes are arranged along the axis of the hub. The centers are evenly distributed, and the lower ends of the guide vanes are fixedly connected to the hub, and the upper ends of a plurality of guide vanes are connected to the inner wall of the inner channel, and the hub is arranged at the inner wall of the inner channel. Wind end, the vortex generating device is installed outside the air outlet end of the inner duct, the inner duct is arranged in the outer duct, and the central axis of the inner duct and the outer duct are at the same horizontal position , the rotating blade is installed at the air outlet of the inner duct and is located downstream of the guide vane. 2. The double-duct horizontal-axis breeze wind turbine according to claim 1, characterized in that: the middle part of the inner wall of the outer duct and the wind outlet end are arranged with a plurality of ribs parallel to the horizontal axis and the The outer wall of the inner channel is fixedly connected, and the outer wall of the outer channel is connected with the bracket. 3. The double-duct horizontal-axis breeze turbine according to claim 1, characterized in that: the guide blades and the rotating blades are rotating blades twisted along the blade height direction. 4. The double-duct horizontal-axis breeze wind turbine according to claim 1, wherein the vortex generating device consists of 10 petal-shaped stacked edges distributed axially symmetrically along the circumferential direction of the inner channel. Composition of deflectors.