Steam turbine end part steam seal based on centrifugal compression principle
A technology of centrifugal compression and end steam seal, which is applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve the problems of insufficient sealing performance of steam turbine end steam seal, achieve improved sealing effect, efficient operation, and reduce shaft seal The effect of the probability of air leakage
Pending Publication Date: 2019-10-08
CITIC HEAVY INDUSTRIES CO LTD +1
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Problems solved by technology
[0003] In order to solve the problem of insufficient sealing performance of the existing steam turbine end seal, the present invention provides a steam turbine end seal based on the principle of centrifugal compression
Method used
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[0015] Referring to the accompanying drawings, the specific implementation is as follows:
[0016] A steam turbine end seal based on the principle of centrifugal compression, such as figure 1 As shown, the steam turbine includes a rotor and a cylinder 1, the rotor main shaft 2 protrudes from the cylinder 1, the rotor main shaft 2 inside the cylinder 1 is provided with blades, and the high-temperature and high-pressure steam is sprayed to the blades through the nozzles in the cylinder 1, thereby Driving the blades and the rotor main shaft 2 to rotate converts the thermal energy of the steam into the kinetic energy of the rotor rotation. Due to the above-mentioned structure, there must be a gap between the rotor main shaft 2 and the side wall of the cylinder 1. In order to prevent the steam in the cylinder 1 from leaking through the gap, a steam valve is installed between the rotor main shaft 2 and the side wall of the cylinder 1 through which it passes. seal up.
[0017] Such...
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The invention discloses a steam turbine end part steam seal based on a centrifugal compression principle. The seal comprises a steam seal block arranged on a rotor main shaft in a sleeve mode and steam seal teeth fixed to the side wall of an air cylinder, wherein the teeth ends of the steam seal teeth face towards and close to the outer peripheral surface of the steam seal block, the outer end surface, far away from an inner cavity of the air cylinder, of the steam seal block is provided with a gas gathering groove, the gas gathering groove is a circle of annular groove which is arranged around the rotor main shaft, a plurality of pressurization holes are formed in the steam seal block at intervals and around the rotor main shaft, one ends of the pressurization holes communicate with the inner wall of the groove bottom of the gas gathering groove, the other ends of the pressurization holes are obliquely extended to the outer peripheral surface of the steam seal block in the direction away from the rotor main shaft and towards the inner cavity of the air cylinder, the other ends of the pressurization holes are located between every two adjacent tooth ends of the steam seal teeth, sothat gas in the gas gathering groove can flow to the steam sealing teeth along the pressurization holes under the centrifugal action of synchronous rotation of the steam seal block along with the rotor main shaft, air flow flowing from the inner cavity of the air cylinder to the outer side of the air cylinder along gaps between the steam seal teeth and the steam seal block is blocked, and the sealing performance of the steam turbine steam seal is improved.
Description
technical field [0001] The invention relates to the field of steam turbine end seals, in particular to a steam turbine end seal based on the principle of centrifugal compression. Background technique [0002] The steam turbine is a rotary steam power device powered by steam. The high-temperature and high-pressure steam passes through the fixed nozzle to become an accelerated air flow and sprays it on the blades, so that the rotor equipped with blade rows rotates and at the same time does work externally, thereby converting the heat energy of the steam. It is the mechanical power and is the most widely used prime mover in modern thermal power plants. It has the advantages of high power, high efficiency and long service life. In a steam turbine, the main shaft of the rotor will inevitably protrude from the cylinder. Since the rotor rotates at a high speed, there is a certain gap between the rotor and the cylinder, and a small amount of steam will leak into the atmosphere throu...
Claims
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Login to View More IPC IPC(8): F01D11/04
CPCF01D11/04
Inventor 王家全朱曙光孙亚娟江丽红王趁新陈付平刘怀亮贾丹程庆芳米亮刘华平徐朝伟王孟张轲陈琛程相振许文辉赵鹏飞
Owner CITIC HEAVY INDUSTRIES CO LTD