Energy-saving reversed-opening type flap valve

Abstract

An energy-saving reversed-opening type flap valve comprises an outward-flowing pipeline (1), a flap valve seat (2) and a flap valve (7), wherein a hinged shaft support (4) is arranged below the flap valve seat (2), a rotating shaft (5) is arranged in the hinged shaft support (4), the flap valve (7) is in seamless contact with an outline of the flap valve seat (2) by the rotating shaft (5), and a counter weight (6) is arranged below the flap valve (7). The energy-saving reversed-opening type flap valve has the advantages that the opening angle range of the flap valve is expanded to be 10-90 degrees, and head loss is reduced; when the flap valve is closed, the gravity center of the flap valve is close to the rotating shaft (5), the rotating inertia of the flap valve is low, and the closing dead center position of the flap valve is close to the top part when the flap valve is closed; the closing negative pressure is low, so that the closing impact force is low, the vibration times are reduced, the energy-saving reversed-opening type flap valve has the functions of achieving the silence effect, protecting a pipeline and prolonging the service life of hydraulic buildings.

Description

technical field [0001] The invention relates to the technical field of cut-off devices, in particular to an energy-saving reverse flip flap door. Background technique [0002] The flap door is a one-way valve located at the outlet of the water pump outlet pipe, which uses hydraulic power and the self-restarting of the door body to close the one-way valve, and has the function of preventing the backflow of external water. Because of its simple structure, low cost and strong automation, the flap door is widely used in the cut-off of straight pipe or knee-shaped outlet channels of some large pumping stations. But the traditional free-style flap door has the following two major defects: one is due to the limitations of the design principle, the opening angle of the flap door is small, the water head loss at the water outlet is large, and the opening angle of the flap door in general large-scale water pumping stations is only 60° -80°, so the water head loss caused by ordinary f...

AI Technical Summary

Problems solved by technology

But the traditional free-style flap door has the following two major defects: one is due to the limitations of the design principle, the opening angle of the flap door is small, the water head loss at the water outlet is large, and the opening angle of the flap door in general large-scale water pumping stations is only 60° -80°, so the water head loss caused by the ordinary flap door is very huge; secondly, a large impact force will be generated under the action of water pressure and the flap door's own weight when it is shut down, which will cause great harm to the flap door itself and hydraulic structures.

[0003] The existing technology has made some improvements to the flap door, but there are still great limitations in summary

For example: the opening angle of a flap door with a counterweight can reach about 50°, but when the unit stops, the closing time and instantaneous angular velocity of the flap door will increase, and the impact force of closing the door will increase greatly, and the installation must be equipped with a vent hole; Although the rhythmic flap door has been improved, the effect of cutting off the flow is reduced due to water leakage at the middle hinge, and the impact force cannot be ignored when the door is closed; the technology of the hydraulic buffer flap door is mature, but the cost is too high, and there is a big problem in application. limitations etc.

There are also some side-turning flap doors, which can reduce the water head loss at the outlet to a certain extent, but still fail to make breakthroughs in reducing or even eliminating the impact force of closing the door, and have a short service life.

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