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

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

Inactive Publication Date: 2003-05-07
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

[0025] In the first embodiment figure 1 , image 3 , Figure 4 , Figure 5 The meanings of each label are as follows:

[0026] R 0 - the inner radius of the sealing face between the rotating ring and the stationary ring

[0027] R 1 - inner radius of the helical groove

[0028] R 2 - the outer radius of the helical groove

[0029] R 3 - the outer radius of the sealing face between the rotating ring and the stationary ring

[0030] R b - balance radius

[0031] h-helical groove depth

[0032] H- high pressure side, i.e. upstream

[0033] L - low pressure side, i.e. downstream

[0034] G-spiral groove pump direction

[0035] α-helix angle

[0036] R-radius

[0037] AB, A″B″-Curve

[0038] A'B' - straight line

[0039] P, P″ - points of tangency of curves and circles

[0040] P'-point of tangency between straight line and circle

[0041] C- When the spiral groove is on the end face of the rotating ring, the direction of rotation of the rotating ring

[0042]...

Embodiment 3

[0053] In the third embodiment Image 6 , Figure 8 , Figure 9 The meanings of each label are as follows:

[0054] R 4 - the outer radius of the sealing face between the rotating ring and the stationary ring

[0055] R 5 - the outer radius of the helical groove

[0056] R 6 - inner radius of the helical groove

[0057] R 7 - the inner radius of the sealing face between the rotating ring and the stationary ring

[0058] R b '-Balance radius

[0059] h'-helical groove depth

[0060] H'-high pressure side, i.e. upstream

[0061] L' - low pressure side, i.e. downstream

[0062] G'-spiral groove pump direction

[0063] C'-When the spiral groove is on the end face of the rotating ring, the direction of rotation of the rotating ring

[0064] M'- main groove wall profile

[0065] N'-Auxiliary groove wall profile

[0066] E'-Single helix angle helical groove auxiliary groove wall profile

[0067] alpha 1 '-Shorter main groove wall M' type line helix angle

[0068] ...

specific Embodiment approach

[0076] In order to further understand the invention content, characteristics and effects of the present invention, the following embodiments are enumerated hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0077] Example 1: Please refer to figure 1 , image 3 , Figure 4 with 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 casing 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 surfac...

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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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IPC IPC(8): F16J15/34
CPCF16J15/3412
Inventor 王玉明王建立
Owner JOHN CRANE TECH TIANJIN
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