Impeller sealing structure for turbo-expander
A technology of turbo expander and sealing structure, which is applied in mechanical equipment, engine components, machines/engines, etc. It can solve the problems of high processing cost, high maintenance cost, and difficult processing of copper-based Babbitt alloy sealing plate, etc., and achieves the goal of processing Simple, good sealing effect, solve the effect of difficult processing and high maintenance cost
Inactive Publication Date: 2020-03-17
XIANGYANG HANGLI ELECTROMECHANICAL TECH DEV
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Problems solved by technology
[0003] For the current power generation turbo expander with a small power generation, the material of the sealing plate in the sealing structure is generally copper-based babbitt alloy. This process of casting babbitt alloy on the copper plate has a significant sealing effect, but the processing cost is high, and repairs need to be replaced. Sealing plate or rework sealing plate, so the maintenance cost is high; for large-scale power generation turbo expanders with increasing power generation in the future, it is difficult to realize the processing of copper-based Babbitt alloy sealing plate
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[0017] figure 1 , 2 , 3, first open the compressed air as dry gas, adjust to a suitable pressure, and then start the power generation turbo expander. After the medium gas passes through the fixed ring 2, the gas flow speed is accelerated to a certain extent, and then enters the impeller 1 uniformly. Most of the medium gas enters the blades of the impeller 1 along the b direction to do work on the blades, and a small part of the medium gas enters the gap 1 along the a direction; the medium gas in the gap 8 enters through the gap δ1 between the sealing plate 3 and the impeller 1 Gap two 9; part of the medium gas in gap two 9 enters the outlet of the impeller 1 through the balance hole 10, and the other part enters the gap δ2 between the diaphragm 6 and the seal ring 7; at this time, the compressed dry gas has already entered the diaphragm 6 and the seal The gap δ2 of the ring 7 prevents the medium gas from leaking out through the gap δ2 because the pressure of the dry gas at t...
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The invention provides an impeller sealing structure for a turbo-expander. An impeller is mounted on a turbine shaft and comprises blades and a wheel disc, a flange is arranged on the back of each blade, and sealing teeth are arranged on the outer wall of each flange; a sealing ring is mounted in an inner hole in the middle of a cylindrical circular partition board, the turbine shaft is sleeved with the sealing ring, external sealing teeth are arranged on the outer side of the sealing ring, a circular bulge is arranged on the side surface, close to the impeller, of the partition board, a fixedring covering the impeller is mounted on the end surface of the bulge, an annular cavity is formed between the flanges and the bulge, and a sealing plate is mounted in the annular cavity; a first-stage sealing structure is formed between the sealing teeth and an inner hole in the sealing plate; a second-stage sealing structure is formed between a cladding layer of the inner hole in the partitionboard and the external sealing teeth on the outer side of the sealing ring; and a dry gas sealing channel is formed on the partition board, and the second-stage sealing structure communicates with thedry gas sealing channel. According to the impeller sealing structure, the problem of leakage of dielectric gas is solved, and the impeller sealing structure is compact in structure, simple in processand good in airtightness.
Description
technical field [0001] The invention relates to a sealing structure of a turbine expander impeller. Background technique [0002] With the gradual deepening of the concept of environmental protection and energy saving, the market demand for turbo expanders for power generation will increase. At present, the coaxial structure of the gearbox and the turbine is adopted in the turbo expander for power generation. In order to prevent the medium gas of the turbo expander from leaking into the gearbox through the axial gap and contaminating the lubricating oil of the gearbox, it is necessary to seal the medium gas. [0003] For the current power generation turbo expander with a small power generation, the material of the sealing plate in the sealing structure is generally copper-based babbitt alloy. This process of casting babbitt alloy on the copper plate has a significant sealing effect, but the processing cost is high, and repairs need to be replaced. The sealing plate or rewor...
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Patent Timeline
Login to View More IPC IPC(8): F01D5/14F01D11/02F01D11/04
CPCF01D5/147F01D11/02F01D11/04
Inventor 张典马翼飞吉曾玉项继圣袁逵郑谦进钱华梅
Owner XIANGYANG HANGLI ELECTROMECHANICAL TECH DEV