Submersible free-flow microhydroelectric station

FIELD: power engineering.

SUBSTANCE: device is designed for converting kinetic energy of free flow of water into electric energy. Proposed microhydroelectric station contains hydraulic turbine with horizontal axle of rotation connected with submersed sealed electric generator. Station is provided with carrying frame consisting of sections on ends of which shields are installed to form confuser at inlet of water flow, and diffuser at outlet. Slow speed generator is used as electric generator whose shaft is directly connected with shaft of hydraulic turbine consisting of separate sections mounted on bearing supports. Each section contains one or more blade propulsors displaced through equal angle relative to each other. Each propulsor has two blades pointed in opposite directions being essentially NASA section modified by provision of cavity on lower plane, maximum depth of which being from 10 to 14% of maximum height of section and installed on posts secured on shaft of hydraulic turbine for fixed displacement of blades in radial and angular directions.

EFFECT: reduced cost of manufacture and mounting.

4 dwg

 

The invention relates to hydropower, namely the free-threaded design of microhydroelectric that converts the kinetic energy of the free flow of water into electricity.

Known hydropower stations on the stream (patent RU 2148184 C1, class F 03 In 13/00, publ. 27.04.2000,) that converts mechanical energy of flowing water into electrical units having blades for perception of influence of flow, mounted on a horizontal frames having a team of construction, moving on rails coastal poles embedded in the ground. The frame is placed over the channel (channel) and is moved up and down on it mounted wheel with blades Assembly immersed in the water and connected to a generator. Before Assembly mounted control water flow. At the bottom of the channel (channel) nabetani creating an optimal flow geometry in a vertical section. Vertical movement of the frame along the guide rails provide optimal immersion of the blades when changing the water level in the channel (the channel). To increase hydroelectric power in the channel is placed a few units.

The disadvantage of this hydroelectric power - the need for execution of construction works in the channel walls and on the bottom. Because the presence of a natural channel with vertical walls and required karetnyi characteristics of the flow are unlikely you must create a special channel and its equipment. Hydrotechnical works in the construction of this hydroelectric significant and costly, in addition, the metal structure of the object is complex and expensive.

Also known hydroelectric power plant (patent RU 2088724 C1, CL E 02 In 9/00, publ. 27.08.97), including a floating element, mounted in the water flow in the river with the possibility of vertical movement when changing the water level, and mounted on a floating element flow part, between the input socket and the exhaust manifold that has a turbine connected to a generator, and the tail part of the exhaust manifold of the floating element is located outside under the water level and increasing in the direction of the flow path cross-sectional area and cross-section of the end portion of the exhaust pipe has a multi-leaf form or the tail part of the exhaust manifold branched into two or more tubes, and the floating element is placed in the closure channel.

The disadvantages of such hydroelectric power plants are the complexity and low-tech design, due to the presence of a catamaran and, especially, the complex design of the conduit with a smoothly changing its cross-section and shape. In addition, this hydroelectric treb is no creation of hydraulic structures: channel and embankment with the closure channel of a certain size in it.

Also known Autonomous vodopogruzhaemy free-threaded micro hydropower plant (certificate of the Russian Federation for useful model №23317, CL F 03 In 13/00, published in BIPM No. 16 of 2002), which contains the generator, fixed vodopogruzhaemy module that includes a turbine with a horizontal axis of rotation, which is connected via located in the gondola gear with the shaft of the generator, and the generator is placed below the water level and installed in a sealed enclosure connected to the gondola multiplier, located vertically sealed tube, the dimensions of which are selected on the basis of conditions of education in the area of generator air bags, sufficient to prevent penetration of water into the body of the generator. Application shipped microhydroelectric model generator led to the sealing of the housing in which it is placed and to the use of gear - multiplier.

The disadvantage of this hydro - complexity and low-tech design of the sealed enclosure and drive with mechanical multiplier, reducing the reliability of the installation and leads to high complexity and cost of manufacture.

The objective of the invention is to reduce the cost of manufacture and installation of hydroelectric power at the expense of the UE is osenia its design and the Assembly-disassembly of microhydroelectric.

The problem is solved in that the immersion in the free-threaded microhydroelectric that includes a turbine with a horizontal axis of rotation, connected with submerged sealed electric generator, according to the invention, the micro hydropower plant is equipped consisting of sections of the carrier frame, the ends of which there are signs that form the input flow of water confuser, a diffuser, as the generator used a low-speed generator, the shaft of which is connected directly with the shaft of the turbine, made of separate sections, mounted in the bearings, and each section contains one or more blade propellers that are offset relative to each other at an equal angle, each of propulsion consists of two oppositely directed blades, each of which represents a profile of NASA, modified by the execution of the depression on the lower plane, the maximum depth which is 10-14% of the maximum height of the profile, and set on racks that are mounted on the shaft of the turbine with the possibility of a fixed displacement of the blades in the radial and angular directions.

This technical result is achieved due to the fact that the frame is shipped with the unit is immersed, for example at the bottom of the river, and is, and is fixed to the craft. This arrangement does not require expensive hydraulic works, allows for rapid installation, removal or relocation to a new place of microhydroelectric. In addition, the use of a low-speed generator allows to exclude from design, two expensive item - sealed capsule and mechanical transfer-multiplier.

The invention is illustrated graphic material. Figure 1 shows a General view of microhydroelectric; figure 2 - section of the turbine; figure 3 - design of centrifugal propulsion devices adjust the wheel speed and angle of attack of the blades; figure 4 - cross section of the blades of the turbines.

Micro hydropower plant includes a turbine with a horizontal axis 1 of rotation, connected with submerged sealed electric generator 2, which are mounted on a supporting structure in the form of a frame 3 with shields at the ends 4, 5 forming the inlet water flow confuser, and the output cone. Frame 3 for ease of manufacture, transportation and installation consists of two fixed sections, which are assembled at the place of installation of the micro, frame 3 is mounted on the bottom of the river or attached to the craft.

As generator 2 used a low-speed generator connected directly to the axis 1 of the turbine, only the individual sections (figure 2), mounted in the bearings 6, 7 (figure 1). Each section of the turbine includes one or more blade propellers 8 (2), shifted relative to each other at an equal angle (figure 1 an example of executing section, consisting of three propulsion shifted by an angle of 120°) and consisting of two oppositely directed blades 9 having a special profile (figure 4), fixed to the uprights 10 (figure 3) by means of brackets 11, with the possibility of a fixed displacement of the blades in the radial and angular directions. On the rack 10 is made of the hub 12 with terminal connection 13 for mounting on the shaft of the turbine, having at the ends of the slotted sections 14, which is installed in the slotted sleeve of the two bearing supports 6, 7, fastened to the frame 3. The number of thrusters in section and sections in the turbine depends on the power of the micro (the length of the turbine). The first section of the turbine at one end inserted into the hollow spline shaft low-speed generator 2 mounted on the frame and has only one external support. The cross section of the blade 9 turbines (figure 4) represents the profile of NASA, modified to run on the bottom plane of the cavity, reducing the cross-section of the tail to increase decline of water flow energy. The maximum depth of the basin (figure 4) is 10-14% of the maximum height of p is file and obtained by simulation.

Adjusting the rotational speed of the turbine and generator (AC frequency) is performed by moving the bracket 11 of the blade 9 on rack 10 blade propeller 8 with subsequent fixation of the screw connection 15. Changing the angle of attack of the blade is achieved by rotation of the blade 9 relative to the rack 10 bladed propulsion 8 (figure 3) due to the thickness of the strip 16 between the blade and the bracket 11 to which the blade is attached. To increase the velocity head and the efficiency of water flow turbine is mounted between the side panels 4 and 5, mounted on the end structures 17 mounted on the frame 3.

Submersible free-threaded micro hydropower plant works as follows.

The flow of water due to the difference of the velocities at the inner and outer side of the blade 9 creates a lifting force is increased by performing a depression on the bottom plane of the blade, rotating blade propellers 8 and the low-speed shaft of the generator 2, which transforms the kinetic energy of rotation of the turbine in an alternating electric current.

Thus, the proposed micro hydropower plant reduces costs, simplifies and reduces the cost of its installation and operation, and is industrially applicable.

Submersible free-threaded micro hydropower plant, including hydrot Urbino with a horizontal axis of rotation, connected with submerged sealed electric generator, wherein the micro hydropower plant is equipped consisting of sections of the carrier frame, the ends of which there are signs that form the input flow of water confuser, a diffuser, as the generator used a low-speed generator, the shaft of which is connected directly with the shaft of the turbine, made of separate sections, mounted in the bearings, and each section contains one or more blade propellers that are offset relative to each other at an equal angle, each of the propulsion consists of two oppositely directed blades, each of which represents a profile of NASA modified by execution of the depression on the lower plane, the maximum depth which is 10-14% of the maximum height of the profile, and set on racks that are mounted on the shaft of the turbine with the possibility of a fixed displacement of the blades in the radial and angular directions.



 

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