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A structure for reducing blowout pressure of urban drainage shafts

A technology for urban drainage and vertical wells, which is applied in the direction of sewage discharge, waterway systems, water supply devices, etc., and can solve problems such as environmental pollution of water-air mixtures, threats to public safety of drainage pipe networks, and pressure pulsation.

Active Publication Date: 2021-07-27
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The blowout phenomenon will not only cause a large pressure pulsation and threaten the public safety of the drainage pipe network, but also the water-air mixture sprayed out will easily cause environmental pollution

Method used

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  • A structure for reducing blowout pressure of urban drainage shafts
  • A structure for reducing blowout pressure of urban drainage shafts
  • A structure for reducing blowout pressure of urban drainage shafts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A new structure for reducing the blowout pressure of an urban drainage shaft, comprising: an inlet pool 1, an upstream pipeline 2, a drop water chamber 5, a downstream pipeline 8 and an outlet pool 9, an inlet pool 1, an upstream pipeline 2, a drop water chamber 5, and a downstream pipeline 8 and the outlet pool 9 are connected successively from left to right, and the top of the drop water chamber 5 is connected to the shaft, and the shaft 3 communicates with the outside atmosphere.

[0032] A diversion shell 6 connecting the upstream pipeline 2 and the downstream pipeline 8 is arranged in the falling water chamber 5 , and a throttle plate 4 is arranged on the top of the shaft 3 , and a combined scheme is formed between the throttle plate 4 and the diversion shell 6 .

[0033] The diversion shell plate 6 is a semicircular gradually expanding shell plate. The inner diameter of the upstream side of the diversion shell plate 6 is the same as that of the upstream pipeline 2 ...

Embodiment 2

[0036]Embodiment 2: Based on Embodiment 1, but different again is;

[0037] This embodiment is applicable to the protection structure scheme for effectively reducing the blowout pressure of the drainage shaft. Conventional sewer design such as figure 1 As shown, in order to reduce the slope of the pipeline, a drop water chamber 5 is usually set. The drop water chamber 5 is connected with the upstream pipeline 2 and the downstream pipeline 8 , and the top of the drop water chamber 5 is connected with the shaft 3 . When heavy rainfall occurs, the water flow in the upstream pipeline 2 changes from an open channel flow to a pressurized flow, and the rapidly increasing water flow quickly fills the falling water chamber 5 under the action of inertia. Due to the small flow velocity of the downstream pipeline 8, the transportation capacity is poor , so the rapidly increasing water flow is sprayed out along the shaft 3 after filling the falling water chamber 5, forming a blowout, acc...

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PUM

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Abstract

The invention discloses a novel structure for reducing the blowout pressure of an urban drainage vertical shaft, which belongs to the technical field of urban drainage. A diversion shell plate is arranged in a water drainage chamber of a drainage system, and a ventilation hole is provided on the side of the diversion shell plate close to the upstream pipeline. A throttling plate is arranged at the outlet of the drainage shaft. During the heavy rainfall period, the rapidly increasing inflow of the upstream drainage pipeline enters the downstream pipeline under the action of the diversion shell plate, and the pre-stored gas in the upstream pipeline and the falling water chamber is trapped in the water chamber above the diversion shell plate to play the role of air cushion cushioning. On the premise of meeting the drainage requirements of the pipeline system, the invention can greatly reduce the blowout pressure in the process of open and full flow of the drainage pipeline, and reduce the damage of the high-pressure water flow to the drainage pipeline system.

Description

technical field [0001] The invention relates to the technical field of urban drainage, in particular to a novel structure for reducing the blowout pressure of an urban drainage shaft. Background technique [0002] In recent years, my country's urbanization process has gradually accelerated, and the use of impermeable materials has increased the pressure on urban drainage pipe networks and inland rivers during periods of heavy rainfall, resulting in frequent occurrence of waterlogging disasters. The waterlogging problem has become one of the main problems facing urban development, and an effective and reliable urban drainage system is the main way to solve this problem. Under normal circumstances, the state of water flow in urban drainage pipes is open channel flow. When encountering heavy rainfall, the water flow in urban drainage pipes will change from open channel flow to pressurized flow in a short period of time, accompanied by huge pressure fluctuations. [0003] When...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E03F1/00E03F3/02E03F3/04
CPCE03F1/003E03F3/02E03F3/04
Inventor 刘甲春黄标朱志伟
Owner NINGBO UNIV