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Unit for sealing end surface of 3D helical flute with double helix angles

A technology of end face sealing and spiral groove, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., and can solve problems such as insufficient fluid film stiffness, insufficient fluid film thickness, and unstable performance of sealing devices

Inactive Publication Date: 2006-08-30
JOHN CRANE TECH TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The known hydrodynamic and static pressure combined spiral groove end face sealing device still has deficiencies, for example, because the helix angles of the helix lines forming the spiral groove in its structure are the same, and the depth of the spiral groove is equal, so under certain working conditions , the thickness of the fluid film is insufficient, or the rigidity of the fluid film is insufficient under a certain fluid film thickness, resulting in unstable performance of the sealing device

Method used

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  • Unit for sealing end surface of 3D helical flute with double helix angles
  • Unit for sealing end surface of 3D helical flute with double helix angles
  • Unit for sealing end surface of 3D helical flute with double helix angles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Example 1: Please refer to figure 1 , image 3 , Figure 4 and Figure 5 .

[0078] figure 1 It is a cross-sectional view of a double-helix-angle three-dimensional helical groove end face sealing device with helical grooves arranged on a rotating ring. The sealing device includes a rotating ring 1 , a stationary ring 2 , an anti-rotation pin 3 , a secondary sealing ring 4 , a push ring 5 , a spring 6 , a housing 7 , a shaft sleeve 8 , a shaft 9 and a static sealing ring 10 .

[0079] The sealing end surface of the rotating ring 1 and the sealing end surface of the stationary ring 2 are attached to each other, the former can rotate relative to the latter, and the bonding surface of the two is the sealing end surface. In this embodiment, the outer side of the sealing end surface is the high pressure side, that is, the upstream H, and the inner side of the sealing end surface is the low pressure side, that is, the downstream. A spiral groove 11 is provided on the sea...

Embodiment 2

[0087] Embodiment 2: The only difference with the structure of Embodiment 1 is that the spiral groove 13 is set on the sealing end surface of the stationary ring 14, please refer to figure 2 . In addition, the spiral groove can also be provided on the sealing end faces of the rotating ring and the stationary ring at the same time (illustration omitted).

Embodiment 3

[0088] Example 3: Please refer to Figure 6 , Figure 8 and Figure 9 .

[0089] The difference from the structure of Embodiment 1 is that the inner side of the sealing end surface in this embodiment is the high pressure side, i.e. upstream H', and the outer side is the low pressure side, i.e. downstream L'. A spiral groove 16 is provided on the sealing end face of the rotary ring 15 . At a given rotation, the helical groove pumps sealing fluid from upstream to downstream in the direction of arrow G'. In addition, there is a flat annular zone 17 inside the spiral groove, that is, at R 4 with R 5 The ring belt between them plays the role of throttling and parking seal, which can be called a sealing dam, please refer to Figure 6 .

[0090] Figure 8 Indicates the shape and position of the spiral groove on the sealing end face. In this figure the effective radial height of the helical groove is (R 5 -R 7 ). Figure 8 and Figure 9 The double-dotted line in the figur...

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Abstract

This invention relates to a screw slot end sealing device used in fluid mechanical rotating shaft characterizing in designing a set of double screw angles, three-dimensional screw slot on a sealed end face of a static ring or a rotating ring in which a screw slot made up of spiral lines at both sides with different angles has a convergent outlook with even wider upstream, high-tension side and even narroder downstream, step-down side and a steadily shalldower depth from high-tension side to step-down side so as to form a three-dimensional convergent screw slot.

Description

technical field [0001] The invention belongs to the end face sealing device of the rotating shaft, in particular to a double helix angle three-dimensional spiral groove end face sealing device, which can be used in various types of compressors, expanders, separators, pumps, and reactor agitators On the rotating shaft of fluid machinery. Background technique [0002] The known hydrodynamic and static pressure combined spiral groove end face sealing device still has deficiencies. For example, the helix angles of the helix lines forming the spiral groove in its structure are the same, and the depth of the spiral groove is equal, so under certain working conditions , the thickness of the fluid film is insufficient, or the rigidity of the fluid film is insufficient under a certain fluid film thickness, resulting in unstable performance of the sealing device. Contents of the invention [0003] The present invention provides a new double helix angle three-dimensional helical gro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/34
CPCF16J15/3412
Inventor 王玉明王建立
Owner JOHN CRANE TECH TIANJIN
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