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Rotor static pressure bearing balance technique for large mixed-flow turbine

A process method and Francis technology, which is applied in the field of static pressure bearing balance technology of large Francis turbine runners, can solve problems affecting the static balance of large runners, deformation of balance balls and mirror plates, etc.

Inactive Publication Date: 2009-07-15
HARBIN ELECTRIC MASCH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

The hydrostatic bearing balancing process method formulated by the present invention adopts the high-pressure oil film always injected between the ball head and the ball seat sliding surface in the hydrostatic bearing balancing tool to lift the weight of the runner, and the friction coefficient of the oil film is far smaller than that of the steel ball and the mirror plate The friction coefficient between them solves the problem that the balance ball and the mirror plate are deformed due to the excessive weight of the runner, which affects the accuracy of the static balance of the large runner. Static balancing of large runners

Method used

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  • Rotor static pressure bearing balance technique for large mixed-flow turbine

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Embodiment Construction

[0005] Such as figure 1 As shown, a large-scale Francis turbine runner hydrostatic bearing balancing process method, the specific process steps are: clean up the corresponding assembly platform, draw the position line of the support center of the lower ring of the runner 2, select the location of the hydraulic source, and install the balance device The transition base 12 of the main support part under the middle balance ball head 4 is fixed on the transition base 12 in the center of the balance field, and the four platforms 11 on which the jack 1 is placed are evenly placed on the lower ring support distribution of the runner 2 according to the quartering arrangement. At the round place, drop the assembled ball support 3 on the upper plane of the transition base 12 and fasten it, place the four hydraulic jacks 7 according to the determined positions, and connect the high-pressure oil pipelines of the four hydraulic jacks 7 and The pumping station is connected to the control sy...

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Abstract

The invention relates to a rotating wheel static pressure bearing balance process used in large-scale mixed-flow water turbine. By injecting high pressure oil membrane between the sliding surface of ball and ball cup in the static pressure bearing balance tool all the time for jacking the rotating wheel weight, the invention achieves the friction coefficient between oil membranes far less than that between the steel ball and the rotating plate; solves the problem that the certain deformations of the balance ball and the rotating plate caused by excessive weight of the rotating wheel influence the static balance precision of the large-scale rotating wheel, and achieves the advantages of high mass precision and strong bearing capability, is suitable for the static balance of large scale rotating wheel.

Description

technical field [0001] The invention relates to a process method for balancing a hydrostatic bearing of a runner of a large Francis water turbine. Background technique [0002] The runner is the core component of the turbine, and the manufacturing precision is very high. The static balance test process of the runner is an indispensable key step in the manufacturing process, and the purpose is to eliminate the residual unbalanced moment that affects the operating conditions. Due to the uneven weight distribution and position deviation factors of the upper crown, lower ring and blades of the runner during the manufacturing process, the position of the center of gravity of the runner deviates from the center of rotation, forming an eccentric moment, also called residual unbalanced moment, which is related to the rotation The weight of the wheel is related. According to the requirements of hydraulic performance, it must be controlled within the specified tolerance range. Therefo...

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Application Information

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IPC IPC(8): G01M1/32
Inventor 周亚信
Owner HARBIN ELECTRIC MASCH CO LTD
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