A Divided Disc Cavity Structure for Wheel Rim Sealing
A technology of sealing structure and cavity structure, applied in machine/engine, leakage prevention, mechanical equipment, etc., can solve problems such as friction pump effect
Active Publication Date: 2019-05-10
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0003] Further analysis of the rotating and stationary disk cavity of the turbine found that due to the relative rotation of the rotating and stationary wall surfaces, the existence of the friction pump effect is inevitable
Method used
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Embodiment Construction
[0018] This embodiment is a segmented disc cavity structure used for wheel rim sealing.
[0019] refer to figure 1 , figure 2 , the present invention is used for the segmented disk cavity structure of rim sealing, and its whole rotating and static disc cavity is divided into static and static disc cavity 2 and rotating and static disc cavity 1 by static dividing baffle plate 9; Composed with the partition baffle 9, the rotating and static disk cavity 1 is composed of the rotor disk 8 and the partition baffle 9, the position of the partition baffle 9 makes the outlet of the static and static disk cavity 2 go to the entrance of the flange sealing structure 4, and the rotating and static disk A radial sealing component is installed at the outlet of chamber 1.
[0020] In this embodiment, the partition baffle 9 is a stationary part that is fixedly connected with the stator disc 7 , and the air inlet 3 of the static disc chamber is formed by punching holes at the connection part...
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The invention discloses a dividing disc cavity structure used for turbine edge sealing. The whole rotor-stator disc cavity is divided into a static stator disc cavity and a rotor stator disc cavity body through a dividing baffle, and the static stator disc cavity is composed of a stator disc and a dividing baffle, and the rotor stator disc cavity body is composed of a rotor disc and a dividing baffle; an outlet of the static stator disc cavity faces towards an inlet of the turbine edge sealing structure, and the sealing piece is mounted at the outlet of the rotor stator disc cavity body. A side edge outlet of the static stator disc cavity is an inclined wall face, and the radial position of the inclined wall face is higher than the radial position of the outlet of the rotor stator disc cavity body, so that the sealed airflow of the outlet of the static stator disc cavity obstructs direct action of the sealed airflow and the fuel gas flow which are carried by the friction pump effect inthe rotor-stator disc cavity body. Due to the fact that the relative velocity of the wall face of the static stator disc cavity is zero, the friction pump effect of the disc cavity and action on themain fuel gas by the friction pump are effectively weakened, then the fuel gas intrusion degree is weakened or sealed and air flow required for preventing intrusion of fuel gas is reduced, the temperature of a turbine disc is lowered, and efficiency of a fuel gas turbine is improved.
Description
technical field [0001] The invention relates to the technical field of gas turbines, in particular to a split disk cavity structure used for wheel rim sealing. Background technique [0002] There is an annular cavity between the turbine rotor disc and the stator disc of a gas turbine called the turbine disc cavity. The gas intrusion into the turbine disc cavity means that the friction pump effect caused by the rotation of the turbine disc will continuously pump out the air in the disc cavity, making the cavity Under the effect of the friction pump effect, when the pumped flow is greater than the supply flow of cold air, gas intrusion will occur at the rim of the turbine disk, that is, the main gas will enter the disk cavity; Interference, causing circumferential pressure fluctuations of the main gas, also creates gas intrusion at the turbine disk rim. The research shows that gas intrusion phenomenon is an important factor leading to the overheating failure of the turbine di...
Claims
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IPC IPC(8): F01D11/08
Inventor 王占学杨帆周莉张晓博
Owner NORTHWESTERN POLYTECHNICAL UNIV