CN205387985U - Water conservancy collection can device - Google Patents

Abstract

The utility model discloses a water conservancy collection can device installs in adjacent first runner and second runner, and it includes the first impeller and second impeller, and the first impeller sets up in first runner, and the second impeller sets up in the second runner. The first impeller and second impeller are continuous through the torque transfer device who sets up between the two, and the first impeller can and change hydroenergy wherein into the rotary machine ability in rotation under the drive of the first runner midstream body, and torque transfer device can transmit the first impeller's rotation to the second impeller. The second impeller is through the rotatory rivers that accelerate in the second runner of self. The device during operation, the first impeller are similar to the hydroenergy machine, and the second impeller is similar to the axial -flow pump, and the two transmits to the second runner in through the partial hydroenergy of torque transfer device in with first runner, realize the water conservancy collection can, is got into to install by accelerated rivers and generate electricity in the tubular turbine in second runner low reaches.

Description

Waterpower energy-collecting device

Technical field

This utility model relates to a kind of TRT, particularly relates to a kind of waterpower energy-collecting device.

Background technology

China river is numerous, and waterpower resourses enrich.Water power has become the important component part of China's electric energy structure, and water power production process has the advantages such as startup-shutdown is convenient, operational reliability is high, with low cost, environmental pollution is little.The hydraulic turbine is the dynamic power machine energy of current being converted to rotating mechanical energy, and it is belonging to the turbomachinery in fluid machinery.The Design of Hydraulic Turbine of China and manufacturing technology have been achieved with certain achievement, but are as greatly developing of hydropower, and power station head is just towards high water head, low water head polarization.

Domestic to hydraulic turbine moulder moisture, the pre-period parameters of the hydraulic turbine at present, namely the research of specific speed and coefficient of specific speed, turbine efficiency, unit speed of hydraulic turbine and specific discharge, runner diameter, hydraulic turbine sky candle etc. has a lot.But these researchs are built upon greatly under the premise that hydraulic turbine condition is stable, say, that will ensure under building large hydraulic engineering.But so not only expend substantial amounts of manpower and materials, have certain environmental hazard, and sparse in western remote districts or personnel, electricity consumption is few, or some place because of special requirements such as scientific investigations when, build large reservoir it is not necessary that.And this exactly provides application space for small hydraulic turbine.

In the modern hydraulic turbine, great majority are all arranged in power station, are used for driving electrical power generators.In power station, the water in upper pond guides the hydraulic turbine into through aqueduct, promotes the runner of the hydraulic turbine to rotate, and final drive electrical generators generates electricity.The water finishing merit then passes through the tail water pipeline of the hydraulic turbine discharged to downstream.Head is more high, flow is more big, then the output of the hydraulic turbine is also more big.And due to the particularity of little head hydraulic turbine working environment and working condition, build reservoir it is not necessary that, how to ensure that the hydraulic turbine has worked into key issue under relatively high water head in this situation.When other parameter constants such as the runner diameter of the hydraulic turbine, guide vane opening, the head of the hydraulic turbine is lower than best efficiency point H₀Time, the efficiency of the hydraulic turbine sharply changes, and when head is higher than H₀Time, the change of efficiency is slower.That is when the hydraulic turbine when entering head lower than hydraulic turbine rated head, improve the head of the hydraulic turbine, it is possible to increase substantially turbine efficiency, and make head stably can also reduce head to change rapidly the injury to the hydraulic turbine.

Summary of the invention

The purpose of this utility model is in that providing a kind of can improve the hydraulic turbine under low water head water environment and enter the waterpower energy-collecting device of water head.

For achieving the above object, a kind of waterpower energy-collecting device designed by this utility model, is installed in adjacent first flow and the second runner, and it includes the first impeller and the second impeller, described first impeller is arranged in first flow, and described second impeller is arranged in the second runner.Described first impeller and the second impeller are connected by the torque transmitter being disposed there between, described first impeller can rotate under the driving of fluid in first flow and water therein can change into rotation mechanical energy, and the rotation of the first impeller can be transferred to the second impeller by described torque transmitter.Described torque transmitter can be realized by the multiple kind of drive, such as gear drive, V belt translation, it would however also be possible to employ reductor realizes.Described second impeller current spun up in the second runner by self.During the work of this device, first impeller is similar to engine using hydrostatic thrust, second impeller is similar to axial-flow pump, part water in first flow can be transferred in the second runner by torque transmitter by the two, realizing waterpower energy collecting, accelerated current enter in the tubular turbine after being arranged on the second flow paths downstream, energy-collecting device and generate electricity.Aforementioned first flow and the second runner can be pipeline, channel etc., for the applied environment of this device, should not be construed as the composition important document of the present invention.

Preferably, described torque transmitter adopts gear drive that the rotation of the first impeller is transferred to the second impeller.

Preferably, described torque transmitter includes the fixing seat of gear and fixed thereon four meshed gears successively, and axle and first gear of described first impeller are connected, and the axle of described second impeller is connected with last gear.

Preferably, described torque transmitter is the adjustable speed change gear of speed ratio, the ratio of the rotating speed of described speed change gear adjustable the first impeller and the second impeller.

Preferably, described first impeller outer diameter is more than the second impeller, to obtain higher energy collecting efficiency.

The beneficial effects of the utility model are: this device rotates acting by water jet propulsion the first impeller in first flow, water can be converted into the mechanical energy of the first impeller, it is connected by torque transmitter and the second impeller, make the second impeller rotate and the current in the second runner are done work, it is water energy by changes mechanical energy, improve the head of hydraulic turbine water inlet, thus improve the work efficiency of the hydraulic turbine.

Accompanying drawing explanation

The plan structure schematic diagram of the waterpower energy-collecting device that Fig. 1 provides for the embodiment of the present invention, in figure, arrow represents water (flow) direction.

Fig. 2 is the forward sight structural representation of waterpower energy-collecting device in Fig. 1, and in figure, arrow represents water (flow) direction.

Fig. 3 is the schematic diagram of torque transmitter and installation site thereof in Fig. 1.

Fig. 4 is the change of water level figure installing hydraulic turbine entrance before and after waterpower energy-collecting device in Fig. 1 additional.

Wherein: first flow the 1, second runner the 2, first impeller the 3, second impeller 4, torque transmitter 5, gear fix seat 6, gear 7, tubular turbine 8

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.

As shown in Figures 1 to 3, the waterpower energy-collecting device that this utility model improves, it is installed in adjacent first flow 1 and the second runner 2, first flow 1 and the second runner 2 respectively one section of big-diameter pipeline in this example.This device includes the first impeller 3 and the second impeller 4, first impeller 3 external diameter is slightly larger than the second impeller 4, first impeller 3 is arranged in first flow 1, second impeller 4 is arranged in the second runner 2, first impeller 3 is connected by the torque transmitter 5 being disposed there between with the second impeller 4, first impeller 3 can rotate under the driving of fluid in first flow 1 and water therein can be changed into rotation mechanical energy, torque transmitter 5 adopts gear drive that the rotation of the first impeller 3 is transferred to the second impeller 4, second impeller 4 current spun up in the second runner 2 by self.During the work of this device, the first impeller 3 is similar to engine using hydrostatic thrust, and the second impeller 4 is similar to axial-flow pump, and the part water in first flow 1 can be transferred in the second runner 2 by torque transmitter 5 by the two, it is achieved waterpower energy collecting.Tubular turbine 8 is positioned at the downstream of the second runner 2, utilizes accelerated generating power by water current.

As it is shown on figure 3, in said apparatus, torque transmitter 5 includes the fixing seat 6 of gear and fixed thereon four meshed gears 7 successively, and axle and first gear of the first impeller 3 are connected, and the axle of the second impeller 4 is connected with last gear.

Compliance test result

It is verified from the efficiency of the hydraulic turbine of energy said apparatus corresponding to moment two aspect below, compares with the hydraulic turbine being provided without this device, analyze effectiveness and the feasibility of this device.

The Bernoulli equation of the first impeller:

$\frac{P_0}{r}+\frac{V_0^2}{2g}+Z_0=\frac{P_1}{r}+\frac{V_1^2}{2g}+Z_1+E_1$

In formula,

P₀Inlet pressure, Pa；P₁The pressure of the first impeller outlet, Pa；

V₀Entrance Mean Speed, m/s；V₁First impeller outlet Mean Speed, m/s；

Z₀Flow inlet position height, m；Z₁Water export position height, m；

E₁Unit mass fluid flows through the energy loss of the first impeller, and namely when ignoring unknown losses, unit mass fluid passes to the energy of the first impeller, J/Kg.

It is left out flowing through the change of potential energy and static energy during impeller, namely

P₀=P₁；Z₀=Z₁；

Substitute into the Bernoulli equation of the first impeller,

$E_1=\frac{V_0^2-V_1^2}{2g};$

The mass flow of runner is rQ, kg/s；

Namely the energy that the first impeller obtains is

N₁=rQE₁；

For ensureing the accuracy calculated, we introduce correction factor α, and this device is gone bail for and kept value α=0.9.

N₁'=N₁·α；I.e. E₁'=E₁α, wherein N₁',E₁' the energy that finally exports for the hydraulic turbine.

Considering the loss of torque transmitter, introduce correction factor γ, this device is gone bail for and is kept value γ=0.92.

Thus can obtain the energy that the second impeller finally obtains is

N₂'=N₁' γ=N₁·α·γ；

E₂'=E₁' γ=E₁·α·γ；

The Bernoulli equation of the second impeller:

$\frac{P_0}{r}+\frac{V_0^2}{2g}+Z_0+E_2=\frac{P_2}{r}+\frac{V_2^2}{2g}+Z_2$

P₂Second impeller outlet pressure, is equivalent to the pressure of hydraulic turbine porch, P_a；

V₂Second impeller outlet Mean Speed, is equivalent to the Mean Speed of hydraulic turbine porch, m/s；

E₂The energy that unit mass fluid is obtained by the second impeller, J/Kg；

Consider energy loss when current are done work by the second impeller, introduce correction factor β.Therefore the power that current are done work by the second impeller is:

N₂=N₂' β=N₁·α·β·γ；

E₂=E₂' β=E₁·α·β·γ；

Again because

P₀=P₂；Z₀=Z₂；

Obtain the Mean Speed formula of hydraulic turbine porch:

$\begin{array}{c}{V}_2=\sqrt{V_0^2+2{\mathrm{gE}}_2}\\ =\sqrt{V_0^2+2{\mathrm{g\α\β\γE}}_1}\\ =\sqrt{\left(1+\mathrm{\α}\mathrm{\β}\mathrm{\γ}\right)\·V_0^2-\mathrm{\α}\mathrm{\β}\mathrm{\γ}\·V_1^2}\end{array}$

The test point peak flow rate (PFR) V in river, known somewhere_max=17.03m/s, lowest speed V_min=9.05m/s, mean flow rate is V_ave=11.37m/s, i.e. head (only considering dynamic head) H_max=14.8m, H_min=4.18m, H_ave=6.60m.The feature of unified with nature current, we represent the change of head in 1 day with one group of random number, referring to table 2.Certain tubular turbine known, design head HR=7.6m.

Assume that in first flow, the energy conversion efficiency of the first impeller is η, then

Calculating herein for convenient, we only take a representative value in a certain scope, as shown in table 1.

The value of η, β during table 1 difference head scope

Head/m	< 6.6 (average water heads)	6.6-7.6 (design head)	>7.6
				η	0.7	0.5	0.4
β	0.8	0.5	0.15

The change of the hydraulic turbine entrance head before and after this energy-collecting device is being installed additional as shown in table 2 by what the Mean Speed formula of hydraulic turbine porch obtained this hydraulic turbine:

Table 2 installs the change of water level before and after this waterpower energy-collecting device additional

Result in upper table is drawn in the diagram, and in figure, abscissa is the time, and vertical coordinate is head, design head HR=7.6m, and namely actual head is gone up in table and installed front head additional, and after rectification, namely head is gone up in table and installed rear head additional.As seen from Figure 4, this waterpower energy-collecting device can significantly improve hydraulic turbine entrance head when low water head.

Claims (5)

1. a waterpower energy-collecting device, it is installed in adjacent first flow (1) and the second runner (2), it is characterized in that: it includes the first impeller (3) and the second impeller (4), described first impeller (3) is arranged in first flow (1), described second impeller (4) is arranged in the second runner (2), described first impeller (3) is connected by the torque transmitter (5) being disposed there between with the second impeller (4), described first impeller (3) can rotate under the driving of fluid in first flow (1) and water therein can be changed into rotation mechanical energy, the rotation of the first impeller (3) can be transferred to the second impeller (4) by described torque transmitter (5), described second impeller (4) current spun up in the second runner (2) by self.

2. waterpower energy-collecting device according to claim 1, it is characterised in that: described torque transmitter (5) adopts gear drive that the rotation of the first impeller (3) is transferred to the second impeller (4).

3. waterpower energy-collecting device according to claim 1 and 2, it is characterized in that: described torque transmitter (5) includes the fixing seat (6) of gear and fixed thereon four meshed gears (7) successively, axle and first gear of described first impeller (3) are connected, and the axle of described second impeller (4) is connected with last gear.

4. waterpower energy-collecting device according to claim 1 and 2, it is characterized in that: described torque transmitter (5) is the adjustable speed change gear of speed ratio, the ratio of the rotating speed of described speed change gear adjustable the first impeller (3) and the second impeller (4).

5. waterpower energy-collecting device according to claim 1 and 2, it is characterised in that: the external diameter of described first impeller (3) is more than the second impeller (4).