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Non-contact annular seal and rotating machine provided with the non-contact annular seal

A ring-shaped sealing and rotating machinery technology, which is applied to mechanical equipment, engine seals, engine components, etc., to achieve the effects of suppressing leakage, reducing leakage, and suppressing unstable vibration

Active Publication Date: 2020-01-24
EBARA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to practical problems such as vibration and deflection of the rotating shaft, the gap in the radial direction cannot be extremely reduced

Method used

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  • Non-contact annular seal and rotating machine provided with the non-contact annular seal
  • Non-contact annular seal and rotating machine provided with the non-contact annular seal
  • Non-contact annular seal and rotating machine provided with the non-contact annular seal

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Embodiment Construction

[0050] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same reference numerals are assigned to the same or corresponding components, and overlapping descriptions will be omitted. In addition, in the embodiments described below, a high-pressure pump will be described as an example of the rotary machine of the present invention.

[0051] figure 1 A cross-sectional view showing a high-pressure pump (multistage centrifugal pump) to which the non-contact annular seal of this embodiment can be applied. This high-pressure pump 1 includes: a main shaft 11 connected to and rotating by a motor not shown; impellers 21a, 21b, and 21c fitted to the main shaft 11; a housing 31 for accommodating the impellers 21a, 21b, and 21c; The bearings 45a, 45b. The bearings 45a, 45b rotatably support the main shaft 11 . A motor (not shown) for rotationally driving the high-pressure pump 1 is coupled to the main...

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Abstract

The increase in the flow rate of a fluid passing through a seal interior is minimized, while the effect of minimizing unstable vibration caused by circumferential swirl flow about an axis of rotation is improved. According to the present invention, a non-contact annular seal is provided which has a rotational solid provided to a rotating section of a rotary machine, and a fixed solid provided to a fixed section of the rotary machine, and which is configured so as to seal a fluid flowing through a gap between the rotational solid and the fixed solid. The non-contact annular seal has a screw groove provided to the surface of the rotational solid and / or the surface of the fixed solid that form the gap, a lead angle of the screw groove relative to a plane intersecting the axial direction of the rotational solid is established, and the lead angle of the screw groove on a seal inlet side is greater than the lead angle of the screw groove on a seal outlet side.

Description

technical field [0001] The present invention relates to a non-contact annular seal and a rotary machine provided with the non-contact annular seal, and in particular to reducing the amount of fluid leakage between an impeller and the like and a housing in a rotary machine that handles incompressible fluid and A non-contact annular seal that reduces vibration to exhibit stable shaft sealing characteristics, and a rotating machine including the non-contact annular seal. Background technique [0002] Rotary machines (hereinafter referred to as "pumps") that transfer liquids are widely used in plants or facilities for power generation, chemical processes, sewers, water supply, and the like. The pump has a housing, and a rotating shaft on which an impeller is mounted. The rotating shaft is disposed inside the housing and is rotatably supported by bearings. The liquid sucked in from the suction port of the casing is boosted by the rotation of the impeller, and discharged from th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/447
CPCF16J15/447
Inventor 渡边裕辅
Owner EBARA CORP