Water meter for accounting of water flow in channels of irrigating system

FIELD: construction.

SUBSTANCE: water meter comprises a measuring device made by crosspieces in the form of beams 1. At the ends of the beams 1 there are frames 2 fixed in the form of a spillway with belts inside, having a form of a shield of a metering spillway with a thin wall 3, and the height of the shield is equal to the height of cut in a rift 7. Frames are fixed to crosspieces at diametrically opposite sides. Beams 1 by means of an axis of rotation 4 installed on boards of a canal, are connected to a reduction gear 5 with a metering device 6. Frames are attached to ends of beams along a generatrix relative to rotation of its axis along a longitudinal cut of the rift in vertical and circular direction along the flow. In the middle and lower part of a spillway rift 7 there is a washing window 8 with a spring loaded plate 9 with a visor 12, arranged as bent to the bottom of the canal.

EFFECT: invention provides for the possibility to measure water flow in narrow canals between their streamlined walls.

2 cl, 6 dwg

 

The invention relates to hydraulic engineering, namely, devices for metering water flow in the canal irrigation system.

Known water-measuring device, comprising placed on the Bank of the watercourse stilling well with a water rail provided with a flow inlet pipe in the well above the inlet pipeline, horizontal canopy mounted over the hole in the diaphragm, and proryvnym pipeline, one end of which is connected to the watercourse downstream of the inlet pipeline (USSR Author's certificate No. 1640288, CL EV 13/00, 1988).

Water-measuring device of this type has a constant flushing flow on the discharge of sediment and cannot account for the measurement of instantaneous flow rate of water in the channel, especially when the minimum water flow in the channel, which is variable in direction. In addition, the limited range of measured discharges and settings and low accuracy of flow measurements at different water level difference, an additional well leads to complexity and cost of the device associated with the constant flushing of sediments and release of irrigation water, while it is impossible to measure water flow with a minimum fall of the water level in front of the diaphragm, as the organization continuous bottom currents occurs constantly. Thus, all this reduced the t measurement error of the flow in the canal irrigation system throughout the water rail.

The closest to the technical nature of the claimed invention is a device for the metering of water in the canal irrigation system, including spillway threshold with a longitudinal opening and a device for flow measurement (USSR author's certificate No. 348681, CL EV 13/00, 1971).

Execution spillway threshold with cut can significantly reduce the amount of sediment and dead volume of water. The downside of it is the inability to measure the instantaneous flow rate of water, which is variable in direction. In addition, the cross-section of an irrigation canal does not always correspond to the cross section of the conventional types of weirs with a thin wall, the consequence of this spillway threshold on the concrete area requires transition sections and additional wells to fit in the measurements of water level, resulting in more expensive devices, this eliminates the possibility of arbitrary, at the discretion of the operator, the replacement of water meter Weir for flow measurement of water along the length of the irrigation canal. In addition, the overflow threshold is its own concrete with a complex estimated mating areas and cannot be replaced, for example, plastic and other materials of the Weir, and to be an integral part of the device.

The aim invented the I - the ability to measure water flow in narrow channels between streamlined their walls.

This goal is achieved by the device frame in the form of a Weir, inside of which is fixed a belt in the form of a plate measuring Weir with a thin wall and is attached to the crosses in the form of rays from diametrically opposite sides and with the axis installed on the sides of the channel, and the axis of rotation is connected to the gearbox with a measuring device. In addition, the frame attached to the ends of the beams for forming relatively rotate on its axis along the longitudinal cut-out threshold in a vertical and in a circular direction on the stream.

The presence of the rotating frame with flap measuring Weir with a thin wall allows you to pull it away from the stationary cutout in the saddle spillway threshold. The result reveals the gap between the lower edges of the frame and the threshold is force feedback, since the fluid flow in this case is the effect on the frame with a measuring Weir, and is the measurement of instantaneous flow rate, which gives the opportunity through the axis of rotation to record the flow rate from the speed when using a displacement sensor, placed on the banks of the canal. The device of a flow sensor may be so arranged that it immediately gives one the count value of the total flow of water across the vertical speed to postpone rotation radial crosspieces in the form of rays with frames and measuring weirs with a thin wall of one form of execution. To simplify the manufacture of the elements across the device can be made removable and depending on the shape of the spillway notch of the Weir can be divided into: rectangular, trapezoidal, triangular, and parabolic, corresponding to the cross sections of irrigation canals. Because it does not require complex mating transition sections, and the frame with the shields weirs can be made of metal, plastic and other materials on site as an integral part of water-measuring devices spillway on the threshold of the longitudinal cut.

Weirs with a thin wall is the most common hydrometric structures for determination of low water flow with great precision.

Weirs with a thin wall, consider the following benefits:

- high accuracy of determination of low water flow, not exceeding 2-3%;

- low cost of manufacture and installation of weirs; the possibility of making maintenance services;

- can be used as stationary, and portable structures, which is especially important for possible verification and certification of other gauging structures;

the flow regime with the approach speed not exceeding 0.5 m/s;

- total deviation them depends only on the coefficients for each form modeling the cut.

The measurement error of water-measuring device is determined by the accuracy class of the used band in the form of a plate measuring Weir with a thin wall and is measured by the time interval in the normal flow meter variable level.

Using the corresponding set of frames with panels mounted on the movable beams relative rotation on its axis, can be applied for the given cross-sections of irrigation canals, the relevant costs. The rotation speed of the water-measuring devices and intensity changes of instantaneous flow rate depends on the number of rays, which result in rotation of the frame along the longitudinal cut (saddle) threshold in the vertical and radial direction of the stream.

Frames with flow meter flap on the circumference of the rotation of the beams reliable means of measuring water flow in small channels. The thickness of the manufacture of steel or other materials removable flap, the size and shape of which correspond to the inner diameter size of the frame, attach side of the upstream seal, the upper end of which is sharpened with side cut-outs. When measuring water flow cross-section of an irrigation canal is changing, respectively, the throughput is changed, it is necessary to replace the frame with a flow meter flap.

In addition, the middle part with Enki spillway threshold, at the level of the bottom of the channel, made washing hole overlapped with the downstream of the spring-loaded plate with hinge, which allows to significantly reduce the possible deposition of sediment stored before the overflow threshold, by periodic cleaning as they accumulate, thereby compensating the reset constant flow of water across the threshold.

1 shows a water-measuring device; figure 2 is a section a-a in figure 1; figure 3 - a view B in figure 2, the possible options for the location of fixed thresholds; figure 4 is a view In figure 2.

Water measuring device to account for the cost of water includes a measuring device, executed by the crosses in the form of rays 1. At the ends of the beams 1 fixed frame 2 with belts inside, having the form of a plate measuring Weir with a thin wall 3, the height of which is equal to the height of the cut threshold. Rays 1 through axis 4 of rotation is connected to the gear 5 with the measuring device 6.

Frame 2, in which the fixed plates of the measuring Weir 3 movably in the axial and in the radial direction of flow, is placed in the saddle fixed spillway threshold 7, placed on the section of the channel elements may be removable and made from a variety of inexpensive materials).

In the middle part of the wall of the spillway threshold 7, at the level of the bottom of the channel, made washing the window 8, the message of which the lower bethamphetamine spring plate 9 with the hinge 10 and the spring 11, over which is placed across the width of its drain and protective visor 12, the curved toward the bottom of the channel, which provides free washout of sediment as sediment.

Water-measuring device operates as follows.

When the flow of water through the overflow threshold of the vertical wall 7 and its removal in the lower reach on the frame 5 with the flap of the measuring Weir 3, movable in the axial direction acts on the part of the flow buoyancy, i.e. creates a torque that exceeds the weight of the beam 1, frame 2 and flap 3, starting water-measuring device to rotate around the axis 6 of rotation. The rotation of the beam 1 with its elements closes the saddle spillway threshold of 7, only having a certain angle with the accumulated energy. At the same time flow of water occurs through the upper edge of the flap 3 in the lower reach. Is, thus, opening of the joint between the edge of the saddle threshold 7 and overlying the frame 2. Is formed a flow gap, through which the flow of water, where there is a drop of water horizons.

The accumulation of stored sediment before proryvnym window 8 and forces the spring-loaded pressure plate 9 is pressed and also opens washing window 8. At reduced ranges of load plate again covers washing hole 8 automatically. This allows you to safely and effectively restore the water level is before the overflow threshold 7 and allows you to act 2 with the flap 3 by means of the rays on the axis of rotation in a circular position in the stream and through the reduction gear 5 is recorded by a measuring instrument.

The dependence of the rotation of the water-measuring device through the saddle threshold 7 on the magnitude of the flow upstream from the minimum to the maximum design is registered by the device 6. As the belt in the form of a plate measuring Weir with a thin wall 3 is attached to the frame 2 inside of it, then they move together. The evaluation unit 6 in this case, simultaneously records the number of movements of the frame 2 with weirs 3. The dependence of the moving plate of the measuring Weir 3 the rate of flow of water is also determined by the calibration of recording device. The presence of the protective shield 12 provides reliability spring plate 9 due to the fact that she would be absent from the top pressure water drain and clogging floating litter, and when the window is opened by raising the plate provides flushing of sediment from the top of the water when the pressure is expired, i.e., high speed expiration, so as washing increases tilted during its movement.

To ensure the efficiency of the device in water consumption, it is necessary that the value of the effort of squeezing the frame 2 with a measuring plate 3 Weir exceeded the value of the weight of the device, located above the saddle fixed spillway threshold 7.

The thickness of the manufacturing flow meter flap, for example, of steel can 0,3...0,5 mm, frame around the hole thickness of 0.5 is 1.5 mm The edge of the recess in the removable plate (belt) to sharpen. The size of the flap corresponds to the inner size of the frame, and the maximum height equal to the height of the cut of the saddle spillway threshold and symmetric with respect to an average line width of the cut spillway threshold.

The operating range of the measured costs depends on the application size and shape of the flow plate with frame corresponding to the size and shape of the spillway threshold and channel, and the extension of the well measurements during construction is not required.

Due to the fact that between moving downstream frames and saddle fixed spillway threshold is force feedback increases the accuracy of the measurement of instantaneous flow rate through the movable plate of the measuring Weir, the evaluation unit measures the flow of water through the speed of its rotation in only one direction of current flow in the channel.

1. Water metering device for metering water into the canals of the irrigation system, including spillway threshold with a longitudinal opening and a device for measuring the flow, characterized in that, to ensure the possibility of measuring water flow in narrow channels, it is provided with a frame in the form of a Weir within which is fixed a belt in the form of a plate measuring Weir with a thin wall and is attached to the crosses in the form of rays with diametrically across the lagoon to the false sides and with the axis, installed on the sides of the channel and the axis of rotation is connected to the gearbox with a measuring device.

2. Water-measuring device under item 1, characterized in that the frame is attached to the ends of the beams for forming relatively rotate on its axis along the longitudinal cut-out threshold in the vertical and in the radial directions of flow.



 

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EFFECT: increased efficiency of meliorative system operation and lower salt content in water-absorbing soil massif and drain flow down to rated parameters of mineralisation.

5 cl, 14 dwg

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