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A sealing reliability verification method for composite seals used in ultra-low temperature environments

A reliability and sealing technology, which is used in liquid/vacuum measurement for liquid tightness, machine sealing ring testing, and mechanical component testing. , to achieve the effect of simple and easy test, strong representativeness and strong test versatility

Active Publication Date: 2020-08-14
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional test method is to investigate the influence of temperature, pressure and other factors on the sealing performance under the rated torque, but this method cannot reflect the influence of torque value, torque relaxation, assembly clearance and other factors on the sealing performance, let alone judge the seal performance. Reliability of use

Method used

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  • A sealing reliability verification method for composite seals used in ultra-low temperature environments
  • A sealing reliability verification method for composite seals used in ultra-low temperature environments
  • A sealing reliability verification method for composite seals used in ultra-low temperature environments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (1) Prepare composite seals with fluorine rubber with an I-shaped radial cross section of the skeleton and a circular ring in the axial cross section of the stainless steel skeleton, and prepare 3 sets of stainless steel integral flange structure test fixtures. Each tooling prepares 12 pieces of M8×40 stainless steel bolts, 12 pieces of M8 stainless steel nuts, 12 pieces of stainless steel spring washers with a diameter of 8 and 24 pieces of stainless steel flat washers with a diameter of 8 and a thickness of 1.5. Prepare enough liquid hydrogen medium, helium mass spectrometer leak detector, torque wrench, plug gauge and red copper gasket with a thickness of 0.05mm ~ 0.3mm. Comments on the sealing test system of this embodiment figure 1 (1 high-pressure gas cylinder; 2 valve; 3 pressure gauge; 4 pressure reducer; 5 test tooling; 6 insulation barrel; 7 temperature range; 8 helium mass spectrometer; 9 vacuum pump), the tooling structure is shown in 2, and 21 flanges in the ...

Embodiment 2

[0076] (1) Prepare a composite seal with a trapezoid in the radial section of the skeleton and a circular ring in the axial section of the silicone rubber half-enclosing the polyetheretherketone skeleton, and prepare 3 sets of aluminum alloy loose flange structure test fixtures. Each set of tooling prepares 16 pieces of M6×44 aluminum alloy bolts, 16 pieces of M6 aluminum alloy nuts, 16 pieces of stainless steel spring washers with diameter 6 and 32 pieces of stainless steel flat washers with diameter 6 and thickness 1. Prepare enough liquid nitrogen medium, helium mass spectrometer leak detector, pressure gauge, torque wrench, plug gauge and brass gasket with thickness 0.1mm~0.5mm.

[0077] (2) Torque variable test: Check whether the test tool groove is defective, measure and record the groove inner diameter, groove outer diameter and groove depth of the sealed groove. Check the surface condition of the seal used in the test and measure the inner diameter, outer diameter and hei...

Embodiment 3

[0083] (1) Prepare composite seals with butyl rubber with a rectangular radial cross-section of the skeleton and a circular ring in the axial cross-section of the superalloy skeleton, and prepare 6 sets of aluminum alloy integral flange structure test fixtures. Each set of tooling prepares 8 pieces of M10×48 high-temperature alloy bolts, 8 pieces of M10 high-temperature alloy nuts, 8 pieces of high-temperature alloy spring washers with a diameter of 10, and 16 pieces of high-temperature alloy flat washers with a diameter of 10 and a thickness of 1.5. Prepare enough liquid hydrogen and liquid nitrogen media, helium mass spectrometer leak detector, torque wrench, plug gauge and aluminum gasket with a thickness of 0.05mm to 0.4mm.

[0084] (2) Torque variable test: Check whether the test tool groove is defective, measure and record the groove inner diameter and groove depth of the sealed groove. Check the surface condition of the seal used in the test and measure the inner diameter ...

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Abstract

A ultralow temperature environment composite sealing member seal reliability verifying method can carry out a reliability verifying test that includes a moment variable test and a flange butt joint surface gap simulation test; before the moment variable test and the flange butt joint surface gap simulation test, a test tool must be trench defect-free, and the trench dimensions must satisfy designrequirements; the sealing member reliability grade can be determined according to an applied moment that satisfies with moment variable test leak rate index requirements and a flange butt joint surface gap that satisfies with a leak rate index of the flange butt joint surface gap simulation test; the test is strong in representativeness, simple and feasible, and strong in versatility.

Description

Technical field [0001] The invention relates to the field of sealing, in particular to a method for verifying the sealing reliability of a composite sealing element for ultra-low temperature environments. Background technique [0002] The propellant medium and use environment of high-performance launch vehicles require that the flange butting surface of the sealing structure meets the high-reliability sealing requirements under ultra-low temperature conditions. The composite seal is a new type of seal. The self-tightening effect caused by the performance difference between different materials makes it possible to achieve ultra-low temperature sealing (utility model patent CN 201322093 Y). However, in actual use, the flange deformation and torque application errors caused by machining and welding make a certain gap in the flange butt surface after installation. If the seal cannot compensate for the gap, it will cause the seal to fail at ultra-low temperature; in addition, Relaxat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/02G01M13/00
CPCG01M3/02G01M13/005
Inventor 王昊田新吴福迪刘志华仵剑皂伟涛张继华
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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