Unlock instant, AI-driven research and patent intelligence for your innovation.

A Ventilation and Pressure Regulating Vertical Shaft Pressure Slope Structure

A technology of pressure regulating type and pressure regulating shaft, which is applied in marine engineering, construction, barrage/weir, etc., can solve the problems of shaft structure stability and flood discharge safety risks, adverse effects of shaft structure stability, and difficulty in air discharge. , to achieve the effect of eliminating the hidden danger of flood discharge, obvious exhaust and pressure regulation effect, and easy construction

Active Publication Date: 2020-09-29
SICHUAN UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the straight section of the vertical shaft and the outlet pressure slope form an almost 90° angle, the sharp change of the angle during the discharge will inevitably produce a drastic change in the streamline, so the initial position of the pressure slope roof usually produces a large pulsating pressure, and the maximum pressure measured in the model test The value reaches 8×9.81kPa, which has an extremely adverse effect on the stability of the shaft structure
In addition, when the shaft discharges with a small flow rate, the air strongly entrained by the vortex cavity in the center of the swirling shaft is quickly discharged in the pressure slope section, and the water flow and water surface in the pressure slope section fluctuate very violently, and the occasional phenomenon of water rushing to the top makes the air discharge more rapid. difficulties, thus further exacerbating the fluctuation of the water surface in the pressure slope (such as figure 2 shown), there are great risks and hidden dangers in the stability of the shaft structure and the safety of flood discharge

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Ventilation and Pressure Regulating Vertical Shaft Pressure Slope Structure
  • A Ventilation and Pressure Regulating Vertical Shaft Pressure Slope Structure
  • A Ventilation and Pressure Regulating Vertical Shaft Pressure Slope Structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Ventilation and pressure regulating type shaft pressure slope structure described in this embodiment, such as image 3 , 4 As shown, the structure is set in a conventional swirl shaft spillway, including the pressure slope section of the swirl shaft spillway tunnel and the ventilation surge shaft 9, and the ventilation surge shaft communicates with the swirl shaft pressure slope section and at the same time with the atmosphere Connected vent surge wells. The ventilation and surge well is set at the front section of the slope section at 1 / 8L, L is the length of the slope section, it is located above the slope section, and is connected with the top wall of the slope, and the width of the opening on the top wall of the slope is the same as that of the top of the slope. The walls are of equal width and their height is 0.5 meters above the water level in the shaft section. Ventilation holes are opened on the top of the ventilation and surge wells, and the ventilation holes...

Embodiment 2

[0029] This implementation provides a swirling shaft flood discharge tunnel equipped with the ventilation and pressure regulating type vertical shaft pressure slope structure described in Embodiment 1, including a sluice chamber (inlet) 1, an upper level adjustment section (upper level section) 2, a vortex chamber 3, and a contraction chamber. Section 4, shaft straight section 5, outlet pressure slope section 6 and subsequent lower horizontal discharge section 8.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a ventilating and pressure-regulating vertical shaft pressure slope structure. By setting a ventilating and pressure-regulating well at the position where a large pulsating pressure is generated on the pressure-sloping roof of a flood discharge tunnel of a conventional swirl shaft, and connecting it with the outside atmosphere, it can be used in large shafts. When the flow is discharged, the large pulsating pressure in the front section of the pressure slope is reduced; when the water is discharged with a small flow, the surge well becomes an escape channel to discharge the air that cannot be discharged from the pressure slope in time, thereby greatly weakening the water surface in the pressure slope Fluctuation, reduce or even eliminate the impact of water flow on the pressure slope roof. Among them, the position where the pressure slope roof generates relatively large pulsating pressure is usually the pressure slope roof wall at the junction of the pressure slope section and the vertical shaft section.

Description

technical field [0001] The invention belongs to the field of flood discharge and energy dissipation in water conservancy and hydropower projects, and in particular relates to a vertical shaft pressure slope structure with functions of ventilation and pressure regulation. Background technique [0002] The swirling shaft flood discharge tunnel has attracted more and more attention from the field of water conservancy and hydropower engineering because of its advantages such as low difficulty in construction, flexible layout, and outstanding energy dissipation effect. Especially as my country is currently in the stage of blowout development of hydropower construction, many high dams and large reservoirs with high water head, large flow, and deep canyons are under construction or are in the planning stage. Conventional drainage structures cannot well realize flood discharge. In the case of energy, the swirl shaft is a good choice as a newly developed flood discharge and energy dis...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E02B8/06
CPCE02B8/06
Inventor 白瑞迪王航白中天桑伟刘文刘善均许唯临王韦张建民曲景学邓军田忠张法星罗晶
Owner SICHUAN UNIV