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Imitation shark skin streamlined groove end face mechanical seal structure

A technology of end face mechanical seal and sealing structure, which is applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of limited use range, start-up performance or dynamic pressure effect and unsatisfactory gas film bearing capacity, so as to improve the start-up Performance, obvious effect of reducing pressure and increasing resistance, good lubrication effect

Active Publication Date: 2015-10-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these fluid type groove end face seals have low friction power consumption and excellent stability, the unsatisfactory starting performance or dynamic pressure effect and air film bearing capacity limit their application range

Method used

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  • Imitation shark skin streamlined groove end face mechanical seal structure
  • Imitation shark skin streamlined groove end face mechanical seal structure
  • Imitation shark skin streamlined groove end face mechanical seal structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] refer to figure 1 , figure 2 with image 3 , a streamlined groove end face mechanical seal structure imitating the wrinkled shape of the shark skin surface, which includes a moving ring and a static ring of a mechanical seal, and at least one of the sealing rings in the moving ring or the static ring is provided with a Multiple sets of shark-skin-like streamlined grooves 2 uniformly distributed along the circumference, the streamlined grooves 2 are composed of a left circular arc groove 21, a right circular arc groove 22, and a middle edge pressure of the streamlined groove 2. The first transition part 241 and the second transition part 242 between the rib ridge-shaped boss 23 in the descending direction and the outer contour line of the streamlined groove 2 form a flow shape similar to the wrinkled shape of the shark skin surface. Linear groove, referred to as imitation shark skin streamlined groove. The imitation sharkskin streamlined groove is arranged on the hig...

Embodiment 2

[0039] refer to Figure 4 The difference between this embodiment and the first embodiment is that the downstream end of the imitation sharkskin streamlined groove is connected with other grooves 5 or holes 6, so as to increase the pressure in the circumferential direction of the end surface where the root of the groove is located and its vicinity Uniform distribution, enhanced hydrodynamic pressure effect, improved fluid film stiffness, improved seal start-up characteristics, low-speed and low-pressure operation capability, and end face wear resistance. Described type groove 5 can be circular groove 51, circular arc groove 52 or 53 etc. type line groove, and the width and depth of type groove are respectively w a and h a , the value range is: w a =0.5~2.0mm, h a =h g / 5~h g / 2, where h g Is the depth of the imitation shark skin streamlined groove; the type hole 6 is a millimeter-level regular cross-section hole, and its cross-sectional shape can be rectangle, square, trape...

Embodiment 3

[0041] refer to Figure 5 The difference between this embodiment and the first embodiment is that the left circular arc groove 21 and the right circular arc groove 22 present a converging stepped structure with a deep upstream and a shallow downstream. The convergent fluid type groove can be one step, two steps or multiple steps, but in order to control the processing cost, under the premise of meeting a certain cost performance, generally two or three steps are better, the convergent type left The minimum depth of the downstream side of the circular arc groove or the right circular arc groove should meet: when sealing liquid medium, not less than 0.25mm, when sealing gas medium, not less than 1.0μm; in addition, in sealing stability and end surface lubricity requirements are higher In some cases, a convergent inclined step structure may also be used, and the inclination angle of the inclined step is 2-10 degrees. The shark-skin-like streamlined groove end face mechanical sea...

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Abstract

Disclosed is a streamline groove end face mechanical sealing structure imitating a creased appearance of the surface of sharkskin. The streamline groove end face mechanical sealing structure comprises two mechanical sealing rings, namely a moving ring and a static ring, plural groups of streamline grooves imitating the creased appearance of the surface of the sharkskin and arranged along the peripheral direction are arranged at least one end face of the sealing rings of the moving ring and the static ring. Each biomimetic groove comprises a left circular groove and a right circular groove, a convex platform along the pressure drop direction in the groove and transitional parts between two sides of the convex platform and an outer contour line of the groove, so that the streamline grooves, namely sharkskin imitation streamline grooves, with the appearance imitating the creased surface of the sharkskin are formed. The sharkskin imitation streamline grooves are arranged on a high pressure side of an end face medium, namely an upper stream. The whole outlines of the sharkskin imitation streamline grooves are in a contracting shape along the pressure drop direction. The sharkskin imitation streamline grooves are arranged to form a groove annular belt along the circumference of the end face, and a plane annular belt area without grooves on the outer end face other than the groove annular belt is a sealing dam.

Description

Technical field: [0001] The invention belongs to a non-contact end face sealing device of a rotating machine, which is suitable for the shaft end sealing device of a rotating shaft of a rotating machine such as various compressors, pumps, and tank agitators, and particularly relates to a non-contact end face sealing device capable of bidirectional rotation, and It is suitable for a wide range of working conditions, especially for high-pressure working conditions, and belongs to the technical field of mechanical end face sealing. Background technique: [0002] Shaft end seals (such as mechanical seals, packing seals, labyrinth seals, etc.) are indispensable basic components in various fluid machinery, power machinery and other rotating machinery. At present, non-contact mechanical seals have become the preferred shaft end seals for high-parameter rotary fluid machinery due to their outstanding features and advanced performance such as non-contact, no wear, low energy consumpt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/16F16J15/40
Inventor 彭旭东许静白少先李纪云王玉明
Owner ZHEJIANG UNIV OF TECH
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