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A method to determine the valve closing law after pump shutdown accident in high-lift water delivery system

A technology for water delivery systems and closing laws, applied in design optimization/simulation, pipe components, computer-aided design, etc., can solve problems such as large amount of calculation, time-consuming and laborious, lack of theoretical analysis and guidance, etc., to avoid numerical simulation calculation, The effect of large scientific research and practical application value

Active Publication Date: 2020-06-16
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the lack of theoretical analysis and guidance, this method has a certain degree of blindness, resulting in a large amount of calculation, time-consuming and labor-intensive

Method used

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  • A method to determine the valve closing law after pump shutdown accident in high-lift water delivery system
  • A method to determine the valve closing law after pump shutdown accident in high-lift water delivery system
  • A method to determine the valve closing law after pump shutdown accident in high-lift water delivery system

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Embodiment Construction

[0031] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] The method for determining the valve closing law of the high-lift water delivery system after the pump stops the accident pump according to the present invention comprises the steps of:

[0033] (1) For a high-lift water delivery system that satisfies the conditions, the numerical simulation calculation is carried out when the valve refuses to move, and the flow change curve of the valve is obtained.

[0034] The conditions to be met by the high-lift water delivery system are:

[0035]

[0036] Among them, H B is the water level of the outlet pool, H U is the water level of the inlet tank, a is the wave velocity of water hammer, g is the acceleration of gravity, A is the cross-sectional area of ​​the dry pipe, Q T0 is the total flow of the main pipe in the initial stable operation;

[0037] (2) From the change cu...

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Abstract

The invention discloses a method for determining the closing law of the valve after the pump stops the accident pump in the high-lift water delivery system. For the high-lift water delivery system that meets the conditions, the numerical simulation results of the pump stop water hammer under the condition that the valve refuses to move can be drawn up. The initial impact time of valve closing, and then according to the conditions that should be satisfied at the initial impact time, the valve closing law can be determined. The present invention omits cumbersome numerical simulation trial calculations, quickly determines the valve closing law considering the water hammer protection requirements, provides a basis for the setting of the valve action of the pump accident, and has a very large application prospect.

Description

technical field [0001] The invention belongs to the field of water conservancy and hydropower engineering, and in particular relates to a method for determining the law of valve closure after a pump stops an accident pump in a high-lift water delivery system. Background technique [0002] Due to the advantages of various types, low price, convenient operation, safety and reliability, valves are widely used in flow regulation and hydraulic control of water delivery systems. Reasonable valve operation can effectively reduce the hazards of the transition process, so the optimization of the valve action law has become an important content of the calculation and research of the transition process. [0003] For the gravity flow water delivery system, the action of the valve is the main cause of water hammer. In theory, as long as the valve is operated properly, the safety of the system can be guaranteed. Therefore, it is relatively simple to determine the action law of the valve. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L55/045G06F30/20G06F111/10
CPCF16L55/045G06F30/20
Inventor 范呈昱张健许听雨张磊俞晓东陈胜
Owner HOHAI UNIV