Method and device for preventing machine lifting of water-turbine generator set

Abstract

The invention belongs to hydraulic machinery engineering, in particular to a method and a device for preventing machine lifting of a water-turbine generator set. The method comprises the following steps that: a check valve type flap door M is arranged in a flat pressure passage from a rotating wheel outlet to a rotating wheel inlet of a water turbine; when the generator set is in a normal electricity generation state, P1 is greater than P2, the check valve type flap door M is closed, and water in the passage can not flow downward; when the generator set is about to generate the machine lifting, P2 is greater than P1, the flap door M is opened, the water in the passage flows upward, P2 is reduced, and P1 is increased, so the stress of the water turbine meets a formula that the difference value of P2 and P1 is smaller than or equal to the weight G of the rotating part of the water-turbine generator set, in the formula, P1 is downward axial water thrust, P2 is upward axial water thrust, and G is the weight of the rotating part of the water-turbine generator set. The flat pressure passage can be realized through two or more than two passages which are uniformly distributed along the outer circumference of a rotating wheel chamber. The invention provides the method and the device, which have the advantages of simple structure, safety, reliability and capability of preventing the machine lifting of the water-turbine generator set.

Description

technical field [0001] The invention belongs to hydraulic mechanical engineering, in particular to a method and device for preventing hydraulic generator sets from lifting. Background technique [0002] Some of the power stations that have been built now, such as: Gezhouba Hydropower Station, Hunan Province Shuifumiao Hydropower Station, Anren Dashi Hydropower Station, Mayang Majingao Hydropower Station, Hongyan Hydropower Station and Syria Dishlin Hydropower Station designed by Northwest Survey and Design Research Institute, etc., due to hydroelectric power generation The lifting of the unit makes the normal operation of the power station encounter obstacles, and in severe cases, the thrust bearing and structural components of the hydro-generator will be damaged. [0003] The lifting phenomenon of the hydro-generator unit generally mainly occurs in the following three situations: [0004] 1) After the load shedding of the hydro-generator set, the water-guiding vane of the ...

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Problems solved by technology

[0002] Some of the power stations that have been built now, such as: Gezhouba Hydropower Station, Hunan Province Shuifumiao Hydropower Station, Anren Dashi Hydropower Station, Mayang Majingao Hydropower Station, Hongyan Hydropower Station and Syria Dishlin Hydropower Station designed by Northwest Survey and Design Research Institute, etc., due to hydroelectric power generation When the unit is lifted, the normal operation of the power station encounters obstacles, and in severe cases, the thrust bearing and structural components of the hydro-generator will be damaged

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