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An upstream pumping mechanical seal ring with multi-stage helical grooves

A mechanical seal and spiral groove technology, applied in the direction of engine seals, mechanical equipment, engine components, etc., can solve the problems of limited bearing capacity or ability to maintain non-contact, end face wear and service life, poor start-stop effect, etc., to achieve guarantee The effect of long-term stable operation, reducing the degree of friction and wear, and eliminating potential safety hazards

Active Publication Date: 2019-07-16
云南流体规划研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dynamic pressure effect generated by the fluid passing through the single-stage spiral groove is limited, so that the bearing capacity of the fluid film of the mechanical seal or the ability to maintain non-contact is limited, and the contact wear of the end face is prone to occur, which largely offsets the pumping groove opened. Advantages of wear reduction, resulting in poor start-stop effect, end face wear and short service life

Method used

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  • An upstream pumping mechanical seal ring with multi-stage helical grooves
  • An upstream pumping mechanical seal ring with multi-stage helical grooves
  • An upstream pumping mechanical seal ring with multi-stage helical grooves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as Figure 1-3 As shown, an upstream pumping mechanical seal ring with three-stage spiral grooves, the outer diameter side of the end face of the seal ring is the high-pressure side, the inner diameter side is the low-pressure side, and there are six three-point grooves evenly distributed along the circumference of the end face on the end face of the seal ring. The first-stage spiral groove, the third-stage spiral groove opens on the low-pressure side of the end face, and the ungrooved area on the end face of the sealing ring forms a sealing dam;

[0023] Each of the three-stage spiral grooves is composed of logarithmic helices with equal helix angles, and the helix angle α is 15°;

[0024] The circumferential width of the three-stage spiral groove decreases step by step from the low-pressure side to the high-pressure side, forming a convergence gap; the junction of the first-stage spiral groove 1 and the second-stage spiral groove 2 faces the side of the high-pre...

Embodiment 2

[0030] An upstream pumping mechanical seal ring with multi-stage spiral grooves. The outer diameter side of the end face of the seal ring is the high-pressure side, and the inner diameter side is the low-pressure side. There are 10 four-stage spiral grooves evenly distributed along the circumference of the end face on the end face of the seal ring. , the four-stage spiral groove opens on the low-pressure side of the end face, and the ungrooved area on the end face of the seal ring forms a seal dam;

[0031] Each level of helical grooves in the four-stage helical grooves is composed of logarithmic helixes with equal helix angles, and the helix angle is -15 °, that is, the helix direction of the logarithmic helix is ​​opposite to that of embodiment 1;

[0032] The circumferential width of the four-stage spiral groove gradually decreases from the low-pressure side to the high-pressure side to form a convergence gap; the junction of the first-stage spiral groove and the second-stag...

Embodiment 3

[0038] An upstream pumping mechanical seal ring with multi-stage spiral grooves. The outer diameter side of the end face of the seal ring is the high-pressure side, and the inner diameter side is the low-pressure side. There are 15 eight-stage spiral grooves evenly distributed along the circumference of the end face on the end face of the seal ring. , the eight-stage spiral groove opens on the low-pressure side of the end face, and the ungrooved area on the end face of the seal ring forms a seal dam;

[0039] Each of the eight-stage spiral grooves is composed of logarithmic helixes with equal helix angles, and the helix angle is -15 °, that is, the helix direction of the logarithmic helix is ​​opposite to that of Embodiment 1;

[0040] The circumferential width of the eight-stage spiral groove gradually decreases from the low-pressure side to the high-pressure side, forming a convergence gap; the junction of the first-stage spiral groove and the second-stage spiral groove faces...

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Abstract

The invention relates to an upstream pumping machinery sealing ring with multiple stages of helical grooves. The multiple stages of helical grooves uniformly distributed along the circumference of the end surface are formed in the end surface; openings of the multiple stages of helical grooves are formed in the low pressure side of the end surface; the circumferential width and the depth of each stage of helical groove are gradually decreased from the low pressure side to the high pressure side, thus overall forming convergent gaps and greatly enhancing the hydrodynamic pressure effect of the end surface; and therefore, the friction resistance of a machinery seal in an operation process is reduced, and the service life is greatly prolonged.

Description

technical field [0001] The invention relates to an upstream pumping mechanical seal ring with multi-stage spiral grooves, which belongs to the technical field of mechanical seals, and is especially suitable for shaft seals of various rotating machines such as pumps, compressors, and reactors. Background technique [0002] In recent years, in order to improve the lubrication state and service life of the sealing end face in the mechanical seal, various special mechanical seal structures using hydrodynamic and static pressure effects have emerged, including upstream pumping mechanical seals. The so-called "upstream pumping" is to pump the buffer liquid or a small amount of leakage liquid on the low-pressure side of the seal to the high-pressure side through the pumping groove of a certain shape on the sealing end surface. Among all kinds of pumping grooves, the spiral groove is the most typical, and Most of them are single-stage spiral grooves. However, the dynamic pressure e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/16
CPCF16J15/16
Inventor 宋鹏云陈果
Owner 云南流体规划研究院有限公司
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