CN108729421A - One kind is for water conservancy diversion sand discharge apparatus before hydraulic structure - Google Patents

Abstract

The invention discloses a flow diversion and sand removal device for a hydraulic structure, comprising a diversion wall, a baffle, a lifting plate and a disturbance module; the disturbance module is arranged between the diversion wall and the baffle, and is connected with the diversion wall The baffle is connected, and the lifting plate can be raised and lowered by the winch hoist, and when the lifting plate is lowered, it is attached to the diversion wall and the baffle. The disturbance module includes two guide vanes, and the surfaces on both sides of the guide vanes are three-dimensional dichroic twisted surfaces. The structure is reasonable and simple. The disturbance module is fixed on the baffle and keeps a certain water passing distance from the diversion wall. At the same time, the disturbance module is designed in a three-dimensional two-way twisted surface shape to increase water flow disturbance and form a spiral flow more easily. The lifting plate ensures different The water flow in the flow direction can form a spiral flow carrying sand through the device to remove the silt and silt in front of the hydraulic structure to ensure the normal operation of the hydraulic structure.

Description

A device for diversion and sand removal in front of hydraulic structures

technical field

The invention relates to the field of diversion walls, in particular to a sand discharge and diversion device for generating spiral flow by bidirectional water flow.

Background technique

At present, the diversion wall plays an increasingly prominent role in the sand discharge of hydraulic structures. The sediment carried by the river will not only silt the river, but also affect the equipment during the work of important water conservancy measures such as hydropower stations and workshops. cause wear and tear. The function of the diversion wall is to remove the silt in front of the hydraulic structure in time, so as to keep the head difference between the upstream and downstream of the hydraulic structure unchanged, so as to ensure the normal working efficiency; at the same time, the diversion wall can also prevent the river from silting up. It can promote the formation of spiral flow to take away the silt and prevent it from entering the working equipment of hydraulic structures and affecting the normal use. However, at present, the use of diversion walls is limited, and the design is mostly used for unidirectional water flow to generate spiral flow, and the sand discharge effect is still limited, which often still causes sedimentation in the river channel, making the water depth of the river channel shallower, and affecting hydraulic structures. function; therefore, it is necessary to provide a sand discharge and diversion device that can adjust two-way water flow to generate spiral flow, and can be widely used in front of hydraulic structures.

Contents of the invention

The purpose of the present invention is to provide a device that can adjust two-way water flow to generate spiral flow diversion and sand discharge, so as to solve the technical problem that the current diversion wall cannot be adjusted.

In order to solve the above problems, the present invention provides a technical solution:

A device for diversion and sand removal in front of hydraulic structures, comprising a diversion wall, a baffle, a lifting plate and a disturbance module; the diversion wall and the baffle are vertically arranged in a river channel in a spaced manner The module is fixed on the baffle and has a certain distance from the diversion wall; the lifting plate is lifted and lowered by the winch hoist, and fits the baffle and the diversion wall when it falls.

Preferably, both the water diversion and diversion wall and the baffle are arc-shaped plates. The deflecting wall and the baffle have the same bending radius and the same bending direction.

Preferably, the disturbance module includes two guide vanes, the surfaces on both sides of the guide vanes are three-dimensional two-way torsion surfaces, one end of the guide vanes is fixedly connected to the baffle, and the other end is a free end. There is a gap.

Preferably, the height of the diversion wall is lower than the baffle.

The bed sand starting speed is calculated using Dou Guoren's formula:

Among them, △ represents the roughness height of the bed surface; δ is the thickness of molecular film water; ε ₀ is the comprehensive cohesion parameter; γ ₀ is the dry ^bulk density of the sediment on the bed surface _; , γ ₀ ＝γ ₀ ^* ; d and d ^* are the median particle size of model and riverbed sediments, respectively.

As can be seen from the above, in order to make the device of the present invention play the role of diversion and sand discharge, the starting speed of the model bed sand must be satisfied in the model test, and then according to the ratio of the model bed sand to the actual river bed silt particle size, adjust a suitable The height-to-width ratio of the diversion wall, the curvature of the two-way torsion surface of the disturbance module, and the distance between the guide vanes can reach the actual starting speed of the sand bed.

The effective effect of the present invention: the present invention has a reasonable and simple structure, and the winch hoist works to realize the rise and fall of the lifting plate, realize the control of the lifting plate on the water flow in different directions to form a spiral flow, and the plate rises to fully open, so that The water flow can directly follow the interval between the baffle plate and the diversion wall, and flow through the twisted surface of the guide vane perpendicularly, and the formed spiral flow can take away the silt in the area covered by the device; At this time, the water flow can jump over the diversion wall from the direction perpendicular to the water-facing surface of the diversion wall to the guide vane, forming a spiral flow carrying sand; The water flow is disturbed by the guide vane to generate a spiral flow. This setting removes silt more conveniently, thereby adjusting the water depth in the river channel and solving the problem of serious siltation.

Description of drawings

For ease of illustration, the present invention is described in detail by the following specific implementations and accompanying drawings.

Fig. 1 is a structural schematic diagram of the present invention.

In the figure: 1. Lifting plate; 2. Diversion wall; 3. Baffle; 4. Disturbance module.

Detailed ways

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and deformations can also be made, and these improvements and deformations can also be made. It should be regarded as the scope of protection defined by the claims of this application.

As shown in FIG. 1 , a device for diversion and sand removal in front of a hydraulic structure mainly includes a disturbance module 4 , and also includes a lifting plate 1 , a diversion wall 2 and a baffle 3 .

The diversion wall 2 and the baffle 3 are vertically arranged in the river channel in a manner spaced from each other, and the disturbance module 4 is fixed on the baffle 3 and has a certain distance from the diversion wall 2; the lifting plate 1 is hoisted The type hoist lifts and lands, and fits the baffle and the diversion wall when it falls.

Wherein, the diversion wall 2 and the baffle plate 3 are both arc-shaped plates; the disturbance module 4 includes two guide vanes, and the guide vanes are three-dimensional two-way torsion surfaces.

When the lifting plate 1 is lifted by the hoist hoist, the direction of the water flow passing through is parallel to the board surface of the diversion wall 2 and the baffle plate 3, and perpendicular to the board surface of the disturbance module 4. At this time, the water flow is directly affected by the two-way The influence of the disturbance module 4 on the torsion surface generates radial acceleration, causing the water flow to be discharged with sand in the form of spiral flow.

When the lifting plate 1 is lifted by the hoist hoist, the direction of the water flow passing through is perpendicular to the surface of the diversion wall 2 and the baffle 3, and the water flow is picked up by the water-facing surface of the diversion wall 2 and jumps over the diversion wall , the radial acceleration is generated by the disturbance of the disturbance module, and the sand is discharged in the form of spiral flow.

The above is the formation of the spiral flow generated by the adjustable two-way water flow of the diversion and sand removal device of the present invention.

Above shows and described basic principle of the present invention and main feature and the advantage of the present invention, those skilled in the art should understand that, the present invention is not limited by above-mentioned embodiment, and what described in above-mentioned embodiment and description just illustrates the present invention These principles, under the premise of not departing from the spirit and scope of the present invention, the present invention also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention, and the claimed protection scope of the present invention is defined by the appended Definition of claims and their equivalents.

Claims (6)

1. A device for diverting and sand-discharging in front of hydraulic structures, characterized in that it comprises a diversion wall, a baffle plate, a lifting plate and a disturbance module; the disturbance module is arranged between the diversion wall and the baffle plate, And it is connected with the baffle, and the lifting plate can be raised and lowered by the hoist hoist, and when the lifting plate is lowered, it is attached to the diversion wall and the baffle. 2 . The device for water diversion and sand removal in front of hydraulic structures according to claim 1 , wherein the water diversion wall and the baffle are both arc-shaped plates. 3 . 3 . The device for diversion and sand removal in front of hydraulic structures according to claim 2 , wherein the diversion wall and the baffle have the same bending radius and the same bending direction. 4 . 4. A device for diversion and sand removal in front of hydraulic structures according to claim 1, characterized in that: the disturbance module includes two guide vanes, and the surfaces on both sides of the guide vanes are three-dimensional two-way On the twisted surface, one end of the guide vane is fixedly connected to the baffle, and the other end is a free end, and there is a gap between the contact with the guide wall. 5 . The device for diversion and sand removal in front of hydraulic structures according to claim 4 , wherein the height of the diversion wall is lower than that of the baffle. 6 . 6. according to claim 5, a kind of device for diversion and desilting before the hydraulic structure is characterized in that: bed sand starting speed utilizes Dou Guoren's formula to calculate: Among them, △ represents the roughness height of the bed surface; δ is the thickness of molecular film water; ε ₀ is the comprehensive cohesion parameter; γ ₀ is the dry ^bulk density of the sediment on the bed surface _; , γ ₀ ＝γ ₀ ^* ; d and d ^* are the median particle size of model and riverbed sediments, respectively.