A rotating shaft thread circulation water sealing structure based on negative pressure cavity
A technology of sealing structure and circulating water, applied in the direction of engine sealing, instruments, mechanical equipment, etc., can solve problems such as endangering the operation of the unit, reducing the efficiency of the blade cascade, destroying the blade profile, etc., to reduce the roughness and reduce the processing difficulty. , the effect of convenient processing
Active Publication Date: 2021-07-13
XI AN JIAOTONG UNIV
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Problems solved by technology
Water erosion of the blades is a serious hazard, ranging from destroying the profile of the blades and reducing the efficiency of the cascade, to breaking the blades and endangering the operation of the unit
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Embodiment Construction
[0028] The present invention will be further described below in conjunction with the accompanying drawings.
[0029] see figure 1 , the present invention provides a rotating shaft thread circulating water seal structure based on a negative pressure cavity. The main structural parts involved in its action include the rotating shaft 1, the double-ended rectangular right-handed thread structure 3 and the four-headed rectangular right-handed thread structure processed integrally with the rotating shaft 1 A rectangular left-handed thread structure 2, and a cavity 4 through which the rotating shaft 1 passes. Wherein, it can be seen from the simplified sectional view of the cavity 4 that the rotating shaft 1 only passes through the left end of the cavity 4, and its connecting part is also the area where the threaded circulating water sealing structure takes effect. figure 1 It is only a simplified connection schematic diagram of the threaded circulating water seal structure of the r...
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The present invention is a rotating shaft thread water sealing structure based on a sealing cavity. The main components involved in the sealing function include a rotating shaft, a combination structure of four rectangular left-handed threads-double rectangular right-handed threads, a cavity, and a rotating shaft with a threaded water sealing structure. A stainless steel sealing gasket is designed between the part and the cavity, and the area where the seal is effective is the part where the shaft and the cavity move relative to each other. When the sealing system is running, water is introduced from the water inlet of the left end cover, and flows into the middle groove of the reverse thread on the shaft through the water inlet channel of the stainless steel gasket. When the structure rotates, it presses water to the middle groove together, that is, the space between the rotating shaft and the stainless steel sealing gasket is filled with water, and the water is discharged from the symmetrical drainage channel, so that the dynamic seal is realized. The invention can ensure the safe and stable operation of the sealed cavity, and at the same time, can effectively simulate the actual operating conditions of the steam turbine and improve the efficiency of water erosion measurement.
Description
technical field [0001] The invention belongs to the technical field of industrial equipment, and in particular relates to a rotating shaft thread circulation water sealing structure based on a negative pressure cavity, which is applied to the water erosion resistance measurement of steam turbine blade materials. This general sealing structure can also be applied to some test devices or machining equipment in the fields of tribology, surface coating, machining, etc., similar to the negative pressure chamber seal involving rotating parts. Background technique [0002] Water erosion of blades in steam turbines is a common phenomenon. With the increase of the single unit power of the steam turbine, the use of longer final stage blades is an inevitable means to improve the efficiency of the steam turbine. For the final stage blades of modern high-power steam turbines, the peripheral speed at the end of the impeller can be as high as 650m / s. As a result, the working conditions of...
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IPC IPC(8): F16J15/40G01N3/56G01N17/00
CPCF16J15/40G01N3/567G01N17/00
Inventor 谢永慧杨斌张荻张哲源
Owner XI AN JIAOTONG UNIV