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Inclined gradually varied porous end surface non-contact type mechanical sealing structure

A mechanical seal, non-contact technology, applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problem of strong pressure resistance and anti-interference ability, insufficient pressure resistance and anti-interference ability, good end surface lubrication effect, etc. problems, achieve good wear resistance and lubricating ability, avoid high frictional heat generation, and have the effect of strong dynamic pressure opening performance

Active Publication Date: 2013-12-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes the shortcomings of existing unidirectional spiral grooves and linear grooves, bidirectional T-shaped grooves, U-shaped grooves or circular arc grooves, etc. The end face has the disadvantages of poor fluid dynamic pressure effect at low speed or high pressure, and insufficient pressure resistance and anti-interference ability. It provides a non-contact mechanical seal structure that can be used in various conditions and media - inclined gradient porous end face non-contact Mechanical seal structure, this structure has good dynamic pressure effect, solid particle prevention ability and friction and wear resistance ability, low leakage rate, good end surface lubrication effect, strong pressure resistance ability and anti-interference ability, and long service life

Method used

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  • Inclined gradually varied porous end surface non-contact type mechanical sealing structure
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  • Inclined gradually varied porous end surface non-contact type mechanical sealing structure

Examples

Experimental program
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Effect test

Embodiment 1

[0033] see figure 1 , 2 , 3:

[0034] Non-contact mechanical seal structure with inclined and gradual porous end face, which includes a moving ring and a static ring of the mechanical seal. The side is the low-pressure side, that is, the downstream side, and it is characterized in that: the end surface of at least one sealing ring in the moving ring or the static ring is provided with inclined gradual holes symmetrically distributed according to the center of rotation, forming a ring belt of gradual holes; The queues are arranged in an inclined straight line with an inclination angle to the diameter of the end face, and the inclination angles of each queue are equal; the gradual change holes in the queue gradually decrease from the high pressure side, that is, the upstream to the low pressure side, that is, the downstream aperture; they are located at the same radius The size of the tapered hole on the top is the same; the upstream and downstream of the end face of the seali...

Embodiment 2

[0043] see Figure 4 : The gradient hole shape can be one of the following: circle, triangle, square, ellipse, rhombus, rectangle or hexagon.

[0044] The remaining structures and implementation modes of this embodiment are the same as those of Embodiment 1.

Embodiment 3

[0046] see figure 1 , 5 : The gradient ellipse holes themselves have directionality, and can be inclined around the center of each hole, and the inclination angle θ ranges from 0 to 180. In Arrangement 1, the direction of the shear flow and the differential pressure flow are consistent and both point to the downstream side. Under the action of tangential rotational speed shear, the fluid will flow along the long axis of the hole, so that the fluid is continuously accumulated and superimposed in the long axis direction, and is affected by Continuous compression, the pressure gradually increases, thus forming an obvious dynamic pressure opening performance From arrangement 2 to arrangement 6, as the number of pumping holes in the upstream of the low pressure side gradually increases, so that the fluid leaking from the high pressure side to the low pressure side The return to the high-pressure side is more obvious, so that the leakage rate gradually decreases. Among them, the ho...

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Abstract

The invention relates to an inclined gradually varied porous end surface non-contact type mechanical sealing structure, which comprises a movable ring and a static ring adopting mechanical sealing, wherein one sides of the end surfaces of the movable ring and the static ring are high-pressure sides (the upstream parts), the other sides of the end surfaces of the movable ring and the static ring are low-pressure sides (the downstream parts), inclined gradually varied holes in symmetric distribution along a rotating center are formed in the end surface of at least one sealing ring in the movable ring or the static ring, and a gradually varied hole annular belt is formed; queues of the gradually varied holes are ranged into an inclined straight line forming an inclined angle with the diameter of the end surface, and the inclined angle of each queue is identical; the gradually varied holes in the queues are gradually decreased from the high-pressure sides (the upstream parts) to the low-pressure sides (the downstream parts); the sizes of the gradually varied holes with the same radius are identical; and annular sealing dams with smooth planes are arranged at the upstream part and the downstream part of the end surface of the sealing ring. The inclined gradually varied porous end surface non-contact type mechanical sealing structure has the advantages that the abrasion resistance and the lubricating capacity are better, the opening performance and the anti-interference capability are higher, the leakage rate is smaller, and the mechanical sealing structure can be suitable for sealing various kinds of gas and liquid.

Description

(1) Technical field [0001] The invention relates to an end face sealing device of a rotating shaft, which is suitable for the shaft end sealing device of rotating mechanical shafts such as various compressors, pumps and kettle agitators, and belongs to the technical field of mechanical end face sealing. (2) Background technology [0002] At present, mechanical seals are often used as shaft seals for fluid machinery. With the rapid development of the petrochemical industry, mechanical seals are required to have higher stability and long life. The non-contact mechanical seal is more and more favored by the petrochemical industry due to its excellent dynamic pressure performance, low friction power consumption, good end surface lubrication effect, and stable sealing performance. However, some non-contact seal end surface structures currently developed such as: one-way Spiral grooves, linear grooves, two-way T-shaped grooves, two-way U-shaped grooves, etc. have a large leakage r...

Claims

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Application Information

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IPC IPC(8): F16J15/16
Inventor 彭旭东佘宝瑛孟祥铠李纪云
Owner ZHEJIANG UNIV OF TECH
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