Method for adjusting inner chamber plugging plate for cylinder hydrostatic test of steam turbine

A technology of hydraulic test and adjustment method, applied in the field of steam turbines, can solve the problems of falling off of the sealing ring, delaying the hydraulic test period, delaying the test period, etc., achieving the effect of uniform sealing gap, shortening the hydraulic test period and ensuring the success rate

CN102128711AActive Publication Date: 2011-07-20DONGFANG TURBINE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-07-20

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Abstract

The invention provides a method for adjusting an inner chamber plugging plate for a cylinder hydrostatic test of a steam turbine. The method comprises the following steps of: before adjustment, respectively calculating theoretic adjustment values of a thread plunger and a jackscrew threaded rod according to the sizes of the inner chamber plugging plate, a sealing ring, the thread plunger and the jackscrew threaded rod; after adjustment, measuring an effective length of the thread plunger and an axial displacement value of the jackscrew threaded rod; comparing the effective length and the axial displacement value with the theoretic adjustment values so as to determine a sealing condition of the inner chamber plugging plate; and if the effective length and the axial displacement value are different from the theoretic adjustment values, adjusting the effective length of the thread plunger and the axial displacement value of the jackscrew threaded rod again to be equal to the theoretic adjustment values of the thread plunger and the jackscrew threaded rod. By using the technical scheme of the quantified adjustment, a sealing pressure of the inner chamber plugging plate can meet a test requirement, so the sealing gap is uniform, the sealing effect of the inner chamber plugging plate is improved, the success rate of the hydrostatic test can be guaranteed, and the period of the hydrostatic test is shortened. The hydrostatic test on a cylinder having a plurality of working pressure sections can be popularized well; and the method is especially applicable to nuclear turbines, fossil turbines, gas turbines and the like.
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Description

technical field

[0001] The invention relates to the field of steam turbines, in particular to a process method for adjusting a blocking plate in a hydraulic test of a cylinder of a steam turbine. Background technique

[0002] During the power generation operation of the steam turbine, its large components such as high and medium pressure outer cylinders are subjected to high temperature and high pressure steam, and their strength is required to be guaranteed. Therefore, after the cylinder is finished, it is necessary to inspect the cylinder body to check whether there is water seepage or cracks. , the steam turbine can be safely put into operation after passing the inspection. Check the cylinder body, usually by hydraulic test, to check whether there are cracks in the cylinder and whether the strength of the cylinder is qualified.

[0003] like figure 1 As shown, a number of inner cavity blocking plates (2, 3, 4) are set in the high and medium pressure outer cylinder of th...

Examples

Embodiment Construction

[0022] The present invention is a kind of adjustment method of the inner cavity blocking plate of steam turbine cylinder hydrostatic test, the specific steps of this method will be described below by taking the cylinder hydrostatic test of nuclear power steam turbine as an example:

[0023] like Figure 4 As shown, the cylinder 1 of the nuclear power steam turbine is provided with three inner cavity blocking plates (2, 3, 4), which are respectively matched with the corresponding positioning rings on the inner wall of the cylinder 1, so that the cylinder 1 forms a plurality of chambers (B, C , D), where D chamber is a high-pressure chamber. Flanges are arranged on the peripheral edges of the blocking plates (2, 3, 4) in the inner cavity, and the rear end faces of the flanges are matched with the positioning rings, and sealing rings are arranged on the mating faces. The sealing ring is an elastic rubber ring, which can be compressed and relaxed within the range of its elastic d...