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Slide part

A technology of sliding parts and sliding surfaces, which is applied to engine components, engine seals, mechanical equipment, etc., can solve the problem of increased leakage and achieve the effect of preventing leakage

Active Publication Date: 2015-02-25
EAGLE INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the inventions described in the above-mentioned Patent Documents 1 and 2, when there is a pressure difference between the inner periphery and the outer periphery of the sliding surface of the seal, etc., a pumping action against the pressure is required, and there is a problem that the pressure cannot be pumped due to the large pressure. case of fluid pushback
Therefore, when the pressure difference is small, leakage can be prevented, but there is a problem that the leakage amount increases when the pressure difference is large.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0043] refer to Figure 3 to Figure 6 , the sliding member of Embodiment 1 of the present invention will be described.

[0044] In addition, in this embodiment, a case where the member constituting the mechanical seal is a sliding member will be described as an example.

[0045] image 3 It is a vertical cross-sectional view showing an example of a mechanical seal, and is a built-in mechanical seal that seals the sealed fluid on the high-pressure fluid side that leaks from the outer periphery toward the inner periphery of the sliding surface. The rotating ring 3 and the fixed ring 5 are formed between the sliding surface S which is mirror-finished by grinding or the like by means of the helical wave spring 6 and the bellows 7 which urge the fixed ring 5 in the axial direction. Pressing and sliding, the rotating ring 3 is provided in a state capable of rotating integrally with the rotating shaft 1 via the sleeve 2 on the side of the rotating shaft 1 that drives the pump wheel...

Embodiment 2

[0064] Figure 7 Embodiment 2 of the present invention is a plan view of main parts showing an example of a case where communication grooves communicating with the high-pressure fluid side and the like are provided in parts of the dimples other than the cavitation region.

[0065] and, in Figure 7 In FIG. 2 , the same reference numerals as those in Embodiment 1 denote the same components as in Embodiment 1, and overlapping descriptions are omitted.

[0066] exist Figure 7 In (a), a cavitation forming region 14 is formed on the upstream side in the dent 10 , and a positive pressure region 16 is formed by generating dynamic pressure on a portion other than the upstream side, that is, on the downstream side. Furthermore, a communication groove 17 communicating with the high-pressure fluid side is provided in the positive pressure region 16 . The depth of the communication groove 17 is the same as or deeper than the recessed depth of the dent 10 . In addition, the width of t...

Embodiment 3

[0072] Figure 8 Embodiment 3 of the present invention is a plan view of main parts showing an example of the case where the directional rib-like protrusions provided in the cavitation formation region of the dent are formed with the center of the sliding direction of the dent The boundary is symmetrical about the sliding direction of the sliding surface.

[0073] and, in Figure 8 In FIG. 2 , the same reference numerals as those in Embodiment 1 denote the same components as in Embodiment 1, and overlapping descriptions are omitted.

[0074] The sliding members shown in Embodiments 1 and 2 can only be applied when the rotation direction is unidirectional, but in Embodiment 3, it can be applied even when the rotation direction is bidirectional.

[0075] Figure 8 Among them, the directional tendon-like protrusions 15, 15' provided in the air pocket forming region in the dent 10 are formed such that their direction is bounded by a radius line O-O passing through the center of...

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Abstract

The purpose of the present invention is to provide a slide part which is configured so that, irrespective of the magnitude of the difference between pressures at the inner and outer peripheries of a slide surface, leakage can be prevented by controlling the streak-like flow of fluid caused by cavitation generated in a recess such as a dimple formed in the slide surface. A slide part which is characterized in that a dimple is provided in one of the slide surfaces of a pair of slide parts, the slide surfaces sliding relative to each other, and in that a streak-like protrusion which has directivity is formed in the region of the dimple, the region being a region in which cavitation is formed.

Description

technical field [0001] The present invention relates to, for example, a sliding member suitable for a mechanical seal, a bearing, and other sliding parts. In particular, it relates to sliding parts such as seal rings and bearings in which friction is reduced by allowing fluid to exist on a sliding surface and fluid leakage from the sliding surface needs to be prevented. Background technique [0002] In a mechanical seal as an example of a sliding member, in order to maintain the sealing performance for a long period of time, it is necessary to balance the contradictory conditions of "sealing" and "lubrication". In particular, in recent years, in order to cope with environmental issues and the like, there has been an increased demand for low friction in order to reduce mechanical loss while preventing leakage of sealed fluid. As a method of reducing friction, it is possible to achieve a so-called fluid lubrication state in which dynamic pressure is generated between sliding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/34F16J15/32
CPCF16J15/3412F16J15/3448F16J15/348
Inventor 德永雄一郎
Owner EAGLE INDS
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