A sealing method for partial steam leakage in the cylinder block of a steam turbine
A technology for steam turbines and cylinders, which is applied in the direction of leakage prevention, mechanical equipment, engine components, etc., and can solve the problems of not considering, it is difficult to imagine sealing strips, and it is difficult to optimize the structure.
Inactive Publication Date: 2015-08-12
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Problems solved by technology
Selecting the sealing strip only based on the cross-section and material conditions, and then performing fatigue check calculation on the selected sealing strip is a method of cyclic operation to select the sealing strip, which makes the work of selecting the sealing strip very complicated
[0013] In the mechanical seal, the factor that has a greater impact on the sealing performance is the structure of the sealing strip in addition to the material. It is difficult to imagine how to choose a suitable sealing strip if the sealing strip is selected from the two aspects of cross-section and material without considering the appropriate sealing strip structure. strip
When selecting a suitable sealing strip in the above method, it is necessary to select the sealing strip first, then perform fatigue check calculation on the selected sealing strip, and then judge whether it meets the requirements for multiple cycles. Not only is the work complicated, but it is also difficult to select a reasonable structure. Sealing strip, the selected sealing strip may not be able to effectively block the passage of steam leakage. After the sealing strip is selected, the sealing groove can be opened on the middle parting surface according to the sealing strip
[0014] In the method of the above-mentioned prior art, the O-shaped sealing strip made of high-temperature-resistant nickel-based alloy is preferably used in the high-pressure cylinder, and the E-shaped sealing strip made of corrosion-resistant stainless steel is selected for use in the low-pressure cylinder, but it is not proposed to use the above-mentioned cycle How the O-ring and E-seals optimized by the method can have beneficial effects, nor does it indicate the impact of the structure of these sealing strips on the sealing performance
[0015] In the prior art, there is no structurally sound sealing strip in the above method
Method used
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[0044] Figure 1~Figure 5 In the steam turbine block, the sealing method of partial surface leakage of steam has the following steps:
[0045] Find the steam leakage position 4 on the split surface 3 of the upper cylinder block 1 and the lower cylinder body 2 of the steam turbine that has been disassembled. Generally, after disassembling the upper cylinder block and the lower cylinder body of the steam turbine, it can Observe the steam leakage position on the mid-section surface;
[0046] A sealing groove 5 is processed in the steam leakage area of the facet in the lower cylinder body;
[0047] Take the sealing strip 6, the sealing strip is a heat-resistant stainless steel thin-walled round tube 8 with an axial opening 7, the degree of the dihedral angle a of the axial opening is 70 to 90 degrees, and the heat-resistant stainless steel thin-walled round tube with an axial opening The length of the length and the length of the sealing groove are a clearance fit, and th...
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A sealing method for preventing local steam leakage of a split of a steam turbine cylinder includes the steps of marking a split of a lower cylinder of the steam turbine separated, with a leakage position; making a seal groove at the leakage position of the split of the lower cylinder; placing a heat-resistant stainless steel thin-walled tube having an axial opening into the seal groove, and making sure that the axial opening faces one high pressure side; combining an upper cylinder and the lower cylinder. When local steam leakage occurs to the split of the cylinder, leaking steam enters the heat-resistant stainless steel thin-walled tube having the axial opening and is trapped in the tube, and the heat-resistant stainless steel thin-walled tube expands under the action of high pressure of the leaking steam; sealing specific pressure of an opening edge in tight butt against the split and the side of the seal groove results in self-sealing, and groove sealing performance of a seal strip is more reliable. The sealing method has the advantages that only the split of the lower cylinder is provided with the seal groove, the requirement on fitting precision is none, and machining is facilitated; the sealing strip is made of the heat-resistant stainless steel thin-walled tube having the axial opening, and the manufacture cost is low.
Description
technical field [0001] The invention relates to a method for sealing partial surface leakage of steam in a cylinder block of a steam turbine, in particular to a method for sealing partial surface leakage of steam in a cylinder block of a steam turbine and a sealing strip. Background technique [0002] The steam turbine in a thermal power plant has a cylinder body, and the cylinder body of the steam turbine has an upper cylinder body and a lower cylinder body that are merged together. Faces are also known as median faces. The upper cylinder body and the lower cylinder body respectively have flanges along the split plane. When assembling the steam turbine, bolts are used to connect the flanges of the upper and lower cylinder blocks together. The working temperature and working pressure of the steam turbine in the thermal power plant are very high. There is no proprietary sealing strip on the mid-section between the upper and lower cylinder flanges of the steam turbine. The s...
Claims
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IPC IPC(8): F01D11/00
Inventor 关明张延峰关山越
Owner 关明