阅读说明：本技术 一种双轴薄膜摆动式水轮机 (Double-shaft film oscillating water turbine ) 是由 张大禹 郭朋华 袁熙 于 2021-01-20 设计创作，主要内容包括：本发明公开了一种双轴薄膜摆动式水轮机,利用固定的矩形叶片支架安装薄膜叶片结构,能够增加单位水轮机结构可以附加的叶片数,同时利用薄膜叶片使其在三个水面均能够受力推动传动轴向同一方向转动,迎着水流方向的矩形叶片支架后侧有薄膜叶片会形成一定导流现象,减少在逆水面产生的反向的力矩,使水轮机整体有较高的能量利用系数,同时在传动轴上安装有S型阻力叶片,进一步提升了整体的性能和自启动性能,也避免了水轮机死点的存在,矩形框架配合薄膜材料的使用,可以减少刚性摆动式叶片设计由于叶片自身惯性产生的迟滞效应,同时在叶片的尾部也避免了由于压力突变产生的叶片空化效应,延长了叶片的寿命。(The invention discloses a biaxial film oscillating water turbine, which utilizes a fixed rectangular blade bracket to install a film blade structure, can increase the number of blades which can be added to a unit water turbine structure, simultaneously utilizes the film blades to enable the film blades to be stressed on three water surfaces to push a transmission shaft to rotate in the same direction, the film blades arranged at the rear side of the rectangular blade bracket facing the water flow direction can form a certain flow guide phenomenon, reduces reverse moment generated on the reverse water surface, enables the whole water turbine to have higher energy utilization coefficient, simultaneously installs S-shaped resistance blades on the transmission shaft, further improves the whole performance and self-starting performance, avoids the existence of dead points of the water turbine, can reduce the hysteresis effect generated by the self inertia of the blades in the design of rigid oscillating blades, and simultaneously avoids the blade cavitation effect generated by pressure mutation at the tail parts of the blades, the service life of the blade is prolonged.)

1. A double-shaft film oscillating water turbine is characterized by comprising two transmission shafts (1) which are arranged in parallel, wherein each transmission shaft (1) is provided with two transmission wheels (2) which are arranged in parallel, wherein the rotating planes of the two driving wheels are in the same plane, the rotating planes of the other two driving wheels are in the other plane, the two driving wheels with coplanar rotating planes are in transmission connection through the driving belts (3), a plurality of rectangular blade brackets (4) are fixed between the two driving belts (3) in an array manner, one sides of the rectangular blade brackets (4) are fixed between the two driving belts (3) through fixed shafts, the rectangular blade brackets (4) are provided with film blades (5), three edges of the film blades (5) are fixedly connected with the frames of the rectangular blade brackets (4), wherein two edges fixedly connected with the rectangular blade bracket (4) are adjacent to the edge where the rectangular blade bracket (4) is positioned on one side of the connecting and fixing shaft.

2. A biaxial film oscillating hydraulic turbine according to claim 1, characterized in that the rectangular blade support (4) runs to the parallel plane of both sides of the driving belt (3), and the angle between the plane of the rectangular blade support (4) and the coplanar plane of the axes of the two driving shafts (1) is not more than 15 °.

3. A biaxial film oscillating hydraulic turbine according to claim 2, characterized in that the plane of the rectangular blade support (4) runs parallel to the plane of the axes of the two drive shafts (1) when the rectangular blade support (4) runs parallel to the plane of the sides of the drive belt (3).

4. The biaxial film oscillating hydraulic turbine according to claim 1, wherein the driving belt (3) is a toothed belt or chain.

5. The biaxial film oscillating hydraulic turbine as defined in claim 4, wherein the driving belt (3) is a toothed belt, and connecting shafts are mounted at both ends of one side frame of the rectangular blade support (4) and are respectively fixedly connected with the side walls of the toothed belts of the two days.

6. The biaxial film oscillating water turbine as defined in claim 4, wherein the driving belt (3) is a chain, the driving wheel (2) is a sprocket, and both ends of one side frame of the rectangular blade support (4) are fixedly connected with the chain links of the two chains, respectively.

7. The biaxial film oscillating hydraulic turbine as defined in claim 1, wherein the rectangular blade support (4) comprises a blade shaft (7) and a rectangular blade frame (8), the blade shaft (7) is fixed to one side of the rectangular blade frame (8), and the rectangular blade frame (8) is fixedly connected to the driving belt (3) through the blade shaft (7).

Technical Field

The invention belongs to the technical field of ocean power generation, and particularly relates to a double-shaft film oscillating water turbine.

Background

With the rapid development of urban modernization and industrialization, energy has long been an important factor influencing the rapid development of economy and society. The common traditional energy sources such as coal, petroleum, natural gas and other fossil fuels can not be regenerated in a short time, and the natural environment can be damaged when the energy sources are consumed. For sustainable development of the environment, the development of new energy sources for replacement is urgent.

Ocean energy is used as a novel green renewable energy source and mainly comprises tidal energy, tidal current energy and wave energy. China has a long coastline and a large sea area, ocean energy is reserved thickly, the coastline is one of the regions with the largest tidal current energy power density in the world, the average power density of part of the regions is more than 20kW/m2, and the development environment and conditions are good. Although tidal current energy has the problems of uneven energy distribution, poor stability and the like, through continuous efforts and exploration, part of tidal current energy equipment realizes full-scale sea test. The tidal current energy generator is mainly divided into the following parts according to the energy capturing principle: horizontal axis, vertical axis, and oscillating hydrofoil. Although the vertical shaft device is less in application compared with a horizontal shaft device, the vertical shaft device is earlier in research and development, and the vertical shaft water turbine has the advantages of no flow direction capturing, simple blade structure, low cost, easiness in processing and the like. In addition, the power generation and speed increasing device of the vertical shaft water turbine can be arranged on the water surface, the sealing requirement can be reduced, the maintenance and the nursing are easy, and the development potential is huge. The vertical axis water turbine can be divided into a lift vertical axis water turbine and a resistance vertical axis water turbine according to different force utilization forms, the resistance water turbine has large starting moment and small starting flow speed; the lift type water turbine has high efficiency. However, most of the existing vertical axis water turbines convert ocean current energy into mechanical energy by circular rotation of blades, and according to the existing research results, the main power generation area is the windward side, but the windward side has a low proportion by circular rotation, and a large amount of flow-stopping area generates resistance or does not generate power, so that the overall low efficiency is caused.

Some of the prior art adopt the swing type blade to increase the power generated by the blade in the resistance area or the reactive power area, and the swing type blade adopted by the prior art has hysteresis caused by inertia, or needs to additionally increase a mechanical structure or an automatic control device to control the swing of the blade, so that the structure is complicated, and the overall efficiency is reduced.

Disclosure of Invention

The invention aims to provide a biaxial film oscillating water turbine to overcome the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a biax film oscillating hydraulic turbine, including two parallel arrangement's transmission shaft, all be equipped with two parallel arrangement's drive wheel on every transmission shaft, wherein the rotation plane of two drive wheels is in the coplanar, the rotation plane of two other drive wheels is in another plane, rotate and connect through drive belt transmission between two coplanar drive wheels in plane, the array is fixed with a plurality of rectangle blade support between two drive belts, one side of rectangle blade support is fixed in between two drive belts through the fixed axle, install the film blade on the rectangle blade support, the trilateral frame fixed connection with rectangle blade support of film blade, wherein with two limits of rectangle blade support fixed connection with be connected the rectangle blade support place limit of fixed axle one side adjacent.

Furthermore, when the rectangular blade support moves to the parallel surfaces of the two sides of the transmission belt, the included angle between the plane where the rectangular blade support is located and the coplane of the axes of the two transmission shafts is not more than 15 degrees.

Furthermore, when the rectangular blade support moves to the parallel surfaces on the two sides of the transmission belt, the plane where the rectangular blade support is located is parallel to the coplane of the axes of the two transmission shafts.

Furthermore, the transmission belt adopts a toothed belt, and connecting shafts are installed at two ends of a side frame of the rectangular blade support and are respectively and fixedly connected with the side walls of the two-day toothed belt.

Furthermore, the transmission belt adopts chains, the transmission wheel adopts chain wheels, and two ends of a side frame of the rectangular blade support are respectively and fixedly connected with chain links on the two chains.

Furthermore, the rectangular blade support comprises a blade shaft and a rectangular blade frame, the blade shaft is fixed on one side of the rectangular blade frame, and the rectangular blade frame is fixedly connected with the transmission belt through the blade shaft.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention relates to a double-shaft film oscillating water turbine, which utilizes two parallel transmission shafts, each transmission shaft is provided with two parallel transmission wheels to form two pairs of coplanar transmission wheel sets, the transmission wheel sets are connected through a transmission belt, a plurality of rectangular blade brackets are fixed between the two transmission belts in an array manner, one side of each rectangular blade bracket is fixed between the two transmission belts through a fixed shaft, a film blade is arranged on each rectangular blade bracket, at least three sides of the film blade are fixedly connected with the frame of the rectangular blade bracket, a film blade structure is arranged by utilizing the fixed rectangular blade brackets, meanwhile, the film blade can be forced on three surfaces to push the transmission shafts to rotate in the same direction, the film blade on the rear side of the rectangular blade bracket facing the water flow direction can form a certain flow guiding phenomenon on the other upstream surface, and the reverse moment generated on the upstream surface is reduced, the whole hydraulic turbine has higher energy utilization coefficient, the rectangular frame is matched with a film material, the hysteresis effect generated by the self inertia of the blade in the design of the rigid swing type blade can be reduced, the blade cavitation effect generated by pressure mutation is avoided at the tail part of the blade, and the service life of the blade is prolonged.

Further, when the rectangular blade support moves to the parallel surfaces of the two sides of the transmission belt, the included angle between the plane where the rectangular blade support is located and the coplanarity of the two transmission shaft axes is not more than 15 degrees, the rectangular blade support can be enabled to be maximum under the action of the same water flow when moving to the two sides, and the phenomenon that the film blade is influenced by the water flow to form a reverse resistance surface due to the overlarge angle is avoided.

Furthermore, when the rectangular blade support moves to the parallel surfaces of the two sides of the transmission belt, the plane where the rectangular blade support is located is parallel to the coplane of the axes of the two transmission shafts, and at the moment, the film blade is stressed maximally in all directions, and the efficiency is highest.

Drawings

Fig. 1 is a schematic perspective view of an overall device according to an embodiment of the present invention.

FIG. 2 is a front view of an embodiment of the present invention.

Fig. 3 is a top view of fig. 2.

FIG. 4 is an isometric view of a rectangular blade support in an embodiment of the invention.

FIG. 5 is a schematic view of a flow field of a thin film blade according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a turbine flow field in the embodiment of the invention.

Wherein, 1, a transmission shaft; 2. a driving wheel; 3. a transmission belt; 4. a rectangular blade support; 5. a film blade; 7. a blade shaft; 8. a rectangular blade frame.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1 to 3, a biaxial film swing type water turbine comprises two transmission shafts 1 arranged in parallel, each transmission shaft 1 is provided with two transmission wheels 2 arranged in parallel, wherein the rotation planes of the two transmission wheels are coplanar, the rotation planes of the other two transmission wheels are coplanar, that is, every two transmission wheels 2 form a group of coplanar transmission wheel sets, and the coplanar transmission wheel sets are in transmission connection through a transmission belt 3; two coplanar drive wheels of the rotating plane are in transmission connection through a drive belt 3, a plurality of rectangular blade supports 4 are fixed between the two drive belts 3 in an array mode, one sides of the rectangular blade supports 4 are fixed between the two drive belts 3 through fixed shafts, thin film blades 5 are installed on the rectangular blade supports 4, three sides of the thin film blades 5 are fixedly connected with the frames of the rectangular blade supports 4, and two sides fixedly connected with the rectangular blade supports 4 are adjacent to the side where the rectangular blade supports 4 are connected on one side of the fixed shafts. The two transmission shafts 1 are meshed with the transmission wheels on the transmission shafts through two transmission belts 3 to realize the common rotation. Wherein two transmission shafts 1 are fixed on the power generation device or the transmission device, and the two transmission shafts 1 are used as a support and power transmission structure of the integral structure.

The rotating plane of the driving wheel is a plane which is vertical to the rotating shaft of the driving wheel and is also a plane where the largest surface of the driving wheel is located.

When the rectangular blade support 4 runs to the parallel surfaces of the two sides of the transmission belt 3, the included angle between the plane where the rectangular blade support 4 is located and the coplane of the axes of the two transmission shafts 1 is not more than 15 degrees. That is, when the rectangular blade support 4 moves to the plane where the parallel sections on the two sides of the same conveyor belt are located along with the conveyor belt 3, the plane where the parallel sections on the two sides of the same conveyor belt are located is parallel to the coplanar of the axes of the two transmission shafts 1, as shown in fig. 2, the rectangular blade support 4 moves until the conveyor belt is located on the horizontal plane.

Preferably, when the rectangular blade support 4 runs to the parallel surface of the two sides of the transmission belt 3, the plane where the rectangular blade support 4 is located is parallel to the coplanar surface of the axes of the two transmission shafts 1, that is, the included angle is 0, and at this time, when the rectangular blade support 4 runs along with the transmission belt to the transmission belt, the rectangular blade support 4 is coplanar with the transmission belt.

Three edges of the film blade 5 are fixedly connected with three frames of the rectangular blade support 4, the frame on one side opposite to the mounting fixing shaft on the rectangular blade support 4 is not connected with the other side of the film blade 5, and an opening structure is formed on one side of the film blade 5 and one side of the rectangular blade support 4.

This application drive belt 3 adopts toothed belt or chain, and when drive belt 3 adopted toothed belt, the connecting axle was installed at the both ends of one side frame of rectangular blade support 4, respectively with the lateral wall fixed connection of two days toothed belt, the installation back, rectangular blade support 4 and toothed belt junction relatively fixed. When the driving belt 3 adopts a chain, the driving wheel 2 adopts a chain wheel, two chain wheels on the transmission shafts 1 form a shaft hub structure, the chain is meshed with the chain wheel, and each chain is respectively meshed with one chain wheel on the two transmission shafts 1. Two ends of a side frame of the rectangular blade support 4 are respectively fixedly connected with chain links on the two chains, and the function of supporting the chains is achieved between the two chains.

Specifically, as shown in fig. 4 and 5, the rectangular blade holder 4 includes a blade shaft 7 and a rectangular blade frame 8, the blade shaft 7 is fixed to one side of the rectangular blade frame 8, and the rectangular blade frame 8 is fixedly connected to the belt 3 through the blade shaft 7. The side part of the blade shaft 7 is fixedly connected with the long edge of the rectangular blade frame 8, the film blade 5 is made of a film material, preferably, three edges of the film blade 5 are respectively fixed with three edges of the rectangular blade frame 8, and the other long edge of the film blade 5 is a free edge. And the direction of the free edges of all the blades is consistent. The film blades 5 can change the direction of the upstream surface (concave surface) along with the change of the direction of water flow, so that the rotating direction of the chain wheel is kept unchanged regardless of the change of the direction of the water flow, and the power generation efficiency of the turbine is ensured. When the rectangular blade support 4 is installed on the transmission belt 3, the long bottom edge of the rectangular blade support 4 is parallel to the axis of the transmission shaft 1.

When fluid passes through the rectangular blade support 4 as shown in fig. 5, due to the elasticity of the membrane blade 5, the free edge of the membrane blade 5 swings to form a certain radian towards the fluid flowing direction, and a concave structure is formed, so that the power generated by the fluid is obtained.

According to the direction of water flow, the translation section close to the flow direction is called a water facing surface, the translation section far away from the water flow direction is a water backing surface, the arc section with the linear speed consistent with the water flow direction is called a water facing surface, and the linear speed inconsistent with the water flow direction is a water backing surface.

When fluid passes through the blades, the free long edges of the membrane blades swing towards the direction of the fluid to form a certain radian due to the elasticity of the membrane, so that power generated by the fluid is obtained. The inertia of the flexible blade is minimal and hysteresis effects are also minimal.

Specifically, as shown in fig. 6, the water flow flows from top to bottom, the transmission shafts are arranged along a plane perpendicular to the water flow, the free edge of the rectangular blade support 4 facing the water flow direction is on the right side, that is, the right side of the film blade 5 on the rectangular blade support 4 at the upper end of the transmission belt 3 is opened, at this time, the plane where the rectangular blade support 4 is located is parallel to the coplane of the axes of the two transmission shafts 1 when the transmission belt 3 is on the horizontal plane, the film blade 5 swings clockwise by a certain angle, so that the film blade 5 facing the water flow obtains a leftward moment, that is, an anticlockwise moment, and the transmission; the rotating linear speed direction is consistent with the water flow direction, the rotating linear speed direction is also the left side of the water turbine, the film blade 5 still generates counterclockwise moment under the action of downward force, the back water surface is also the straight surface of the lower side of the water turbine, the film blade 5 swings counterclockwise by a certain angle, the opening of the film blade 5 faces left at the moment, the film blade is acted by the water flow guided by the upstream surface, the counterclockwise moment is also generated under the action of rightward force, and the included angle between the guided water flow direction and the film blade 5 is closer to be vertical, so the generated moment is larger; the counter-water level is the right side of the water turbine, the linear speed of the movement of the film blade 5 is opposite to the water flow direction, but the film blade 5 can freely swing to a certain degree, and the film blade 5 is arranged on the rear side of the rectangular blade support 4 facing the water flow direction to form a certain flow guide phenomenon, so that the reverse moment generated on the counter-water level is reduced, and the whole water turbine has a higher energy utilization coefficient.

The number of the blades which can be added in the unit water turbine structure is increased, and the area ratio of the upstream surface to the downstream surface is increased, so that the energy utilization rate of the blades to incoming flow in a certain direction is improved. In addition, the rectangular frame is matched with a film material, so that the hysteresis effect generated by the self inertia of the blade in the rigid swing type blade design can be reduced, the blade cavitation effect generated by pressure mutation is avoided at the tail part of the blade, and the service life of the blade is prolonged. Meanwhile, the thin film blades are influenced by water flow to swing so as to improve additional resistance generated by biological attachment or water body corrosion. The use of thin film blades also reduces the overall turbine polar moment of inertia, increasing its self-starting performance. The use of diaphragm blades also reduces the manufacturing and installation costs of the turbine.