Pressure-adjustable core bag type air cushion surge chamber

Abstract

The invention discloses a pressure-adjustable core bag type air cushion surge chamber. The pressure-adjustable core bag type air cushion surge chamber comprises a surge chamber body of which the lower end is communicated with a pressure water channel. The pressure-adjustable core bag type air cushion surge chamber is characterized in that a core bag made from elastic materials is arranged in the surge chamber body; the core bag is filled with compressed gases; the upper portion of the core bag is attached to the inner cavity wall of the surge chamber body. According to the pressure-adjustable core bag type air cushion surge chamber, the fluctuation of the water level can be rapidly attenuated, and the air pressure in the core bag can be adjusted at the same time, so that the pressure-adjustable core bag type air cushion surge chamber has the advantages of being low in construction cost, good in air-leakage resistance, better in energy dissipation and pressure adjusting effect, convenient to repair and maintain and the like.

Description

technical field [0001] The invention belongs to the field of hydropower engineering, and in particular relates to an adjustable pressure core bag type air cushion pressure regulating chamber. Background technique [0002] In hydropower projects, it is generally necessary to use pressure pipes to lead the water stored in the reservoir to the turbine unit for power generation, and sometimes it is also necessary to discharge the tail water of the power generation to the downstream river through the tail water tunnel. In the process of power generation, when the hydraulic turbine unit runs away and suddenly closes the valve, it will cause a water hammer effect in the pressure pipeline. Improper handling may easily lead to strong vibrations in the water diversion pipeline or tailrace tunnel, and even cause damage. The water hammer effect is a vivid statement. It refers to the phenomenon that when the turbine suddenly loses or increases the load, the flow velocity of the water di...

AI Technical Summary

Problems solved by technology

However, using the inner steel plate to form the closed thin shell of the air cushion surge chamber has high engineering cost and complicated construction technology. It is subject to the alternating action of gas-liquid two-phase substances for a long time, which is easy to rust and affects the durability of the structure.

At the same time, under the action of compressed gas, it is very easy to cause local stress concentration at the defect to lead to damage, and it is difficult to repair after damage and air leakage, which takes a long time. Generally, it takes 2 to 4 days to inflate for maintenance, which greatly affects the power generation of the plant unit.

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