Eagle Industry Co., Ltd.

Nok Corporation

Kazumasa Sunagawa

Masatoshi Itadani

Yuichiro Tokunaga

Keiichi Chiba

Kenji Kiryu

Ryoma Yamakawa

Hiroshi Kubota

Hideyuki Inoue

Takeshi Hosoe

Akira Yoshino

Yuta Negishi

Hikaru Katori

Tetsuzo Okada

Akiko Koga

Tadahiro Kimura

Yuuichiro Tokunaga

In an exemplary embodiment, a sliding component includes an annular stationary side seal ringfixed to the stationary side and an annular rotating side seal ringto be rotated together with a rotating shaft, in which by relatively rotating opposing sealing faces S of the stationary side seal ringand the rotating side seal ring, a silicate-containing sealed fluid present on one side in the radial direction of the relatively rotating sealing faces S is sealed, wherein an amorphous carbon filmformed by using a hydrocarbon gas containing no silicon compound is provided on at least any one of the sealing faces S of the stationary side seal ringand the rotating side seal ring, and content of silicon of the amorphous carbon filmis 1.5 at % or less.

Sliding component

In an embodiment, in a sliding component, a sliding face of a stationary-side seal ringhas a fluid circulation groovecommunicating with a high-pressure fluid side via an entrance portionand an exit portion. A rotating-side seal ringhas a larger outer diameter and a smaller inner diameter than the seal ring. A grooveinto which a claw is loosely fitted is provided on an outer periphery of the seal ring. A width of the grooveis smaller than a distance between the portionand thein the circumferential direction. WMR/WSR is set within a range of 0.75&#x3c;WMR/WSR&#x3c;1.4 (WMR is a face width between an inner diameter of the grooveand an inner diameterof the sliding face; WSR is a face width of the sliding face).

In an embodiment, in a slide component, a negative pressure generation mechanismthat generates negative pressure by relative rotational sliding of a stationary-side seal ringand a rotating-side seal ringis provided on a sealing face of one of the stationary-side seal ringand the rotating-side seal ring, and at least the surface of the negative pressure generation mechanismis covered by an adhesion-resistant material film. With the configuration, deposition of precipitates on a negative pressure portion of a sealing face can be inhibited.

Slide component

In an embodiment, a slide component includes one slide partprovided, on a low-pressure side of a sealing face thereof, with a negative pressure generation mechanismincluding a negative pressure generation groove. The negative pressure generation groovecommunicates with a high-pressure fluid side and is separated from a low-pressure fluid side by a land portion R. Another slide partis provided, in a sealing face thereof, with at least one interference groovecommunicating with the high-pressure fluid side for producing pressure variations in a fluid in the negative pressure generation groove. The at least one interference groovehas an endon an inside-diameter side extending to a position to radially overlap the negative pressure generation groove

In an embodiment, a slide component includes a circular ring-shaped stationary-side seal ringfixed to a stationary side and a circular ring-shaped rotating-side seal ringrotating with a rotating shaft, and relatively rotates respective opposed sliding faces S of the stationary-side seal ringand the rotating-side seal ring, thereby sealing a sealed fluid present on one side in a radial direction of the sliding face relatively rotating and sliding, wherein the sealed fluid is a silicate containing fluid; and on at least either one sliding face of the stationary-side seal ringand the rotating-side seal ring, an amorphous carbon filmformed by using hydrocarbon gas not containing organosilicon compound gas in a plasma CVD method is laminated. The slide component can seal a silicate containing sealed fluid to which silicate is added.

Slide Component

Provided is a slide component that can prevent deposit formation on a sealing face as well as promoting circulation of a fluid on sealing faces while fulfilling both conflicting conditions of sealing and lubrication, to maintain the sealing function of the sealing faces for a long period of time. The slide component includes a pair of slide parts that relatively slide on each other, one of the slide parts being provided in a sealing face with fluid circulation groovesthat communicate with a high-pressure fluid side via an inlet portion and an outlet portion and are separated from a low-pressure fluid side by a land portion, the other of the slide parts being provided in a sealing face with interference groovesthat communicate with the high-pressure fluid side and produce pressure variations in a fluid in the fluid circulation grooves

Even when a fluid discharge for discharging high-pressure fluid (sealed fluid) to a high-pressure side of a sealing face is provided, the disclosed sliding component prevents precipitation, adhesion and accumulation of a deposition-causing substance through a dehydration condensation reaction between the high-pressure fluid and low-pressure fluid on the sealing face, and also prevents occurrence of cavitation which would otherwise take place in association with a sudden pressure drop due to a discharge of fluid. Disclosed is a pair of sliding components provided, on a high-pressure side of one of relatively sliding sealing faces thereof, with a fluid discharge for discharging fluid to a high-pressure fluid side, wherein a buffer groove for reducing penetration of low-pressure fluid toward the high-pressure fluid side is provided in the sealing face S on a low-pressure side of the fluid discharge.

Sliding parts of a pair of annular bodies include sealing faces that relatively slide on each other. A reversed Rayleigh step mechanism serving as a negative pressure generation mechanism is provided in at least one of the sealing faces, and a negative pressure generation groove that forms the reversed Rayleigh step mechanism is provided in an arc shape along the circumferential direction of the sealing face so as to be isolated from a high pressure fluid side and a low pressure fluid side by a land section.

Sliding parts

A fluid is actively taken into sealing faces and discharged from the sealing faces to prevent concentration of sediment causative substances on the sealing faces and prevent generation of sediment while preventing leakage of the fluid taken into the sealing faces to a low pressure fluid side. A fluid circulation groove includes an inlet side section where the fluid comes in from a high pressure fluid side and an outlet side section where the fluid goes out to the high pressure fluid side in one of sealing faces of a pair of sliding parts that slide on each other. The fluid circulation groove is isolated from the low pressure fluid side by a land section. Groove width of the outlet side section of the fluid circulation groove is gradually expended toward an outlet end.

A positive pressure generation mechanism includes a positive pressure generation groove provided on a high pressure side of one of sealing faces of a pair of sliding parts including annular bodies that relatively slide on each other, a negative pressure generation mechanism including a negative pressure generation groove provided on a low pressure side, a pressure release groove provided between the positive pressure generation groove and the negative pressure generation groove, and a radial groove that provides communication between the positive pressure generation groove.

Growing community of inventors

Tokyo, Japan

Kazumasa Sunagawa