Jet hydraulic turbine

 

(57) Abstract:

The inventive impeller are made in the form of a hub with covering the blades of the lower rim and tailrace channel. The wheel is provided with an additional lower rim and an additional outlet channels. In the flowing part of the stator is made reflectors, rims - through window. The flow-through portion of the stator is placed coaxially between the rims. Outflow channels are oriented output holes to the reflectors in the direction opposite to the direction of rotation of the turbine and connected in the horizontal plane of the ridges formed between the reflectors and the deaf part of the rims a closed system. 7 Il.

The invention relates to hydromelioration and can be used in the design of turbines.

Known radial-axial turbine is used for low heads, which consists of a stator made of upper and lower annular zones, the United pillars, guide vanes, made in the form of blades mounted between the rings can be rotated, the impeller comprising a conical hub, the lower rim and blades mounted between them.

the wheel radial-axial hydraulic machines, contains upper and lower rims, which is placed between the blades, and in them is fulfilled the cavity corresponding to the profile contour of the peripheral part of the blade, and both wheels made grooves, to install them when the radial movement of the peripheral part of the blade.

The disadvantage of this device is the low reliability of the movable structure.

Most closely related to their design characteristics is the Francis turbine, containing volute, blade guide apparatus, the impeller with hub with the blades and the rim and rigidly connected with it, with the formation of the bypass channel lectopia and movable annular stopper with holes, indicating the spiral chamber with an overflow channel at the closed position of the shutter. The device is designed for emergency release of water flow past the vanes in the bypass channel, and during normal operation it is characterized by low cavitation properties of the low efficiency of energy use water, in particular, do not use the kinetic energy of the flow, increasing when falling under the influence of gravity the water.

The aim of the invention is to increase effectivetime fact, in known hydraulic turbine blade containing a guiding apparatus, the stator, the impeller is made in the form of a hub with a channel, with the blades and the bottom rim, covering them, the impeller is provided with an additional lower rim, and the lower running portion of the stator-reflectors and coaxially placed between the lower rims that have pass-through window to exit the spent water, and overflow channels are made from each surface of the blade and oriented with its outlet to the reflectors of the stator in the opposite to the input direction and are associated with cavities between the reflectors, while the closed system consists of two parts: fixed-reflectors of the stator and the movable consisting of rims, horizontal jumper between channels.

A comparison of the proposed device with the prototype allows to draw conclusions about compliance with a criterion of "novelty" because the proposed device is characterized by the presence of new elements - additional rim-through Windows and reflectors, closed top jumper and paired cavities between channels. The presence of new elements leads and new contacts.

Comparison of the proposed technical solution is not the to provide a technical solution contains characteristics similar to the distinctive features of the claimed object. Therefore, we can conclude that compliance with a criterion of "significant differences".

The essence of the solution lies in the fact that in the inventive solution, the flow of water with working blades enters the channel, changing the direction of movement of the channel opposite the entrance to the blades of the impeller, and creating pressure on them, from which there is a torque. When natakamani flow of water to the reflectors stator speed is reduced to zero, and the kinetic energy of the stream is converted to a reaction force, which is on the shaft of the impeller also forms a torque directed in the same direction as the first. From the effects of flow on the working blade and force the impeller channels comes in motion and moving at a speed equal to the velocity of flow within the channel, but in the opposite direction.

In the process of movement of the impeller, the wheels move and the window in which are suitable to the blades between the reflectors of the stator, from the waste water, were in a closed system, comes from the turbine.

In Fig.1 schematically shows a General view with sections along the axes of the channels of Fig. 2 is a view from above the stator; in Fig.5 - section of the stator and the rims of the Windows of Fig.6 - section stator and rims on deaf rims of the wheels; Fig.7 - variation of performance reflectors.

Jet hydraulic turbine consists of a guide vane, made in the form of rotary blades 1 mounted between the rings 2, 3, impeller, made in the form of the hub 4 mounted on the shaft 5, with 6 blades that extend into the channels 7 from the holes 8 in the surface of the blades, stator with a flowing part 9, on which a radial reflectors 10, the cavity between which are associated with mobile channels 7 of the hub. Fixed reflectors 10 of the stator 9 is coaxially placed between the outer rim 11 and an additional (internal) rim 12, which is executed through the Windows 13 and in the horizontal plane of the rims 11, 12 are connected together by channels 7 jumpers 14, overlying the cavity between the reflector and forming together with the hollow part of the rim and with reflectors closed system, with elements of the stator is the stationary part of the system, and elements of the working wheels (rims, jumpers) - movable part of a closed system.

Jet hydraulic turbine operates as follows.

Water passing between the managing relative to the water inlet on the blade. Thus altering the direction of movement, the water in turn puts pressure on the working blade 6, from which there is a torque on the shaft 5. In the channels 7 under the influence of the residual pressure flow and gravity flow velocity increases, and with it increases the kinetic energy of the flow. At the exit of the channels 7 of the impeller, the flow encounters the reflector 10 of the stator 9, where the speed is reduced to zero and the kinetic energy is converted in a reaction force, which on the shaft 5 of the impeller produces more torque. During the rotation of the impeller movable part of a closed system is moved to the reflectors 10, were in the closed system suitable window 13 and the waste water exits from the turbine.

Thus, through Windows in the rims communication channels between the reflectors in a closed system, with the atmosphere, providing a free exit working water from the turbine. The curved channels from each blade and their relationship with reflectors stator by means of a rim Windows allow more efficient to use the energy of water flow, it is possible to obtain the maximum amount of work, SSDI water velocity, converted on the reflectors of the stator in a closed system in a reaction force. At the same time, individual water flow from each blade, the exit water flow with less energy improve the cavitation properties of the turbine and its service life.

JET HYDRAULIC TURBINE, containing blade machine, stator, impeller, made in the form of a hub with covering the blades of the lower rim, and a discharge channel, wherein, to improve the cavitation characteristics, the impeller is provided with an additional lower rim and an additional outlet channels in the flow part of the stator is made reflectors and rims - through window, with the flowing part of the stator is placed coaxially between the rims and the outlet channels are oriented output holes to the reflectors in the direction opposite to the direction of rotation of the turbine, and is connected in the horizontal plane jumpers, forming between the reflectors and the deaf part of the rims a closed system.

 

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