Dynamic pressure balance rotary sealing part

A rotary seal and dynamic pressure balance technology, applied in the field of high-pressure high-speed rotary seals, rotary seals, can solve the problems of poor adaptability and followability, and achieve the effects of strong designability, good sealing reliability, and long service life

Active Publication Date: 2015-04-22
NO 53 RES INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the seal has poor adaptability...

Method used

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  • Dynamic pressure balance rotary sealing part
  • Dynamic pressure balance rotary sealing part
  • Dynamic pressure balance rotary sealing part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An integrally assembled dynamic pressure balanced rotary seal, the structure of which is shown in Appendix 1.

[0033] The specification of the oil seal is Φ90-120-12, and the lip is designed with a return line.

[0034] The assembly width of the rigid sealing ring is 7mm; the outer diameter of the rigid sealing ring is an interference fit with the inner side of the oil seal 4; the sealing surface of the rigid sealing ring is a rectangular return groove, the width of the sealing surface is 3mm, the gap between the rigid sealing ring and the rotating shaft is 0.05mm, and the helix angle is 2° , Spiral groove depth 1.0mm.

[0035] The rigid sealing ring 1 and the rubber oil seal 2 are assembled into one body to obtain the sealing member involved in the present invention.

[0036] Under the conditions of sealing pressure of 1.2MPa and rotating linear speed of 20m / s, the seal has no leakage in 48 hours of test assessment.

[0037] If the same type of oil seal is used al...

Embodiment 2

[0039] An integrally assembled dynamic pressure balanced rotary seal, the structure is as attached figure 2 shown.

[0040] The specification of the oil seal is Φ90-120-12, and the lip is designed with a return line.

[0041] The assembly width of the rigid seal ring is 6mm; the outer diameter of the rigid seal ring is an interference fit with the inside of the oil seal frame; the sealing surface of the rigid seal ring is a rectangular return groove, the width of the seal surface is 4mm, the gap between the rigid seal ring and the rotating shaft is 0.1mm, and the helix angle 15°, spiral groove depth 0.8mm.

[0042] The rigid sealing ring 1 is assembled with the polytetrafluoroethylene oil seal 2 to obtain the sealing member of the present invention.

[0043] The seal has no leakage for 48 hours at a sealing pressure of 0.3MPa and a rotational speed of 40m / s.

Embodiment 3

[0045] An assembled dynamic pressure balanced rotary seal, the structure is as attached image 3 shown.

[0046] The specification of the oil seal is Φ170-200-15, and the lip is designed with a return line.

[0047] The outer diameter of the rigid sealing ring is the same as the inner diameter of the cavity; the sealing surface of the rigid sealing ring is a rectangular return groove, and the width of the sealing surface of the rigid sealing ring is 10mm; the gap between the rigid sealing ring and the rotating shaft is 0.5mm, the helix angle is 20°, and the helical groove is deep 0.2mm.

[0048] The rigid sealing ring 1 and the rubber oil seal 2 are assembled into one body to obtain the sealing member involved in the present invention.

[0049] The seal has no leakage for 48 hours at a sealing pressure of 0.5MPa and a rotational speed of 20m / s.

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Abstract

The invention belongs to the technical field of sealing and discloses a dynamic pressure balance rotary sealing part. The pressure borne by a second sealing lip is reduced based on a spiral sealing principle and through the pumping function on fluid arranged in sealing gaps in a filling mode in the rotating process, and reliable sealing under the high-pressure and high-speed sealing working condition is achieved through coordination of multiple sealing. The dynamic pressure balance rotary sealing part is of a double-lip sealing structure and is composed of a rigid sealing ring (1) and an oil seal (2). The dynamic pressure balance rotary sealing part is characterized in that the sealing face of the rigid sealing ring (1) is provided with a backflow groove (3), a sealing gap is not larger than 1 mm, and the rigid sealing ring is located on the oil side. The sealing part is high in designability, good in sealing reliability, long in service life, suitable for high-pressure rotary sealing occasions, particularly suitable for high-speed and high-pressure rotary sealing of shafts/cylinders and suitable for reliable sealing of 0.05 MPa-2 MPa and 10 m/s-40 m/s rigorous working conditions.

Description

technical field [0001] The invention belongs to the technical field of sealing, and relates to a rotary sealing technology, in particular to a high-pressure high-speed rotary sealing technology. Background technique [0002] The rotary shaft oil seal generally includes a flexible rubber lip, a skeleton and a spring. The flexible rubber lip has an interference fit with the sealing shaft. The spring provides a stable radial force. The sealing lip exerts a tight force on the rotary shaft to prevent fluid leakage. The oil seal can also prevent the intrusion of external dust. The oil seal has a metal skeleton, which is used for the stability and fastening of the seal. The oil seal plays an important role in the reliability of the equipment power and transmission system. [0003] Generally, the oil seal has poor pressure bearing capacity, and the oil seal is deformed when the pressure is too high, so a pressure-resistant support ring or a reinforced pressure-resistant oil seal is...

Claims

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Application Information

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IPC IPC(8): F16J15/32F16J15/16F16J15/3244
CPCF16J15/164F16J15/26F16J15/3204
Inventor 庞明磊崔俞杜华太张志刚孙志勇张春梅张斌邹德广杜明欣宫志欣
Owner NO 53 RES INST OF CHINA NORTH IND GRP
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