Eagle Industry Co., Ltd.

Hikaru Katori

Masatoshi Itadani

Yuichiro Tokunaga

Keiichi Chiba

Takeshi Hosoe

Wataru Kimura

Hideyuki Inoue

Tetsuya Iguchi

Kazumasa Sunagawa

Yuta Negishi

Hiroki Inoue

Yoshiaki Takigahira

Hidetoshi Kasahara

Tadahiro Kimura

Takafumi Ota

Nobuo Nakahara

Minori Onuma

Ryosuke Uchiyama

Yasuhiro Ikeda

Akira Yoshino

Tomoko Yamaki

Wataru Kiura

An annular sliding component includes a sliding surface provided with a plurality of fluid introduction grooves communicating with a space on the side of a sealing target fluid and introducing the sealing target fluid thereinto and a plurality of inclined grooves extending from a leakage side toward the sealing target fluid and generating a dynamic pressure and the sliding surface of the sliding component is provided with a reverse inclined groove which is provided on the side of the sealing target fluid of the inclined groove, extends in a reverse direction with respect to the inclined groove, and generates a dynamic pressure.

Sliding component

An annular sliding component includes a sliding surface provided with a plurality of fluid introduction grooves communicating with a space on the side of a sealing target fluid and introducing the sealing target fluid and a plurality of inclined grooves extending from a leakage side toward the sealing target fluid and generating a dynamic pressure and the sliding surface of the sliding component is provided with at least a concave portion disposed between adjacent two of the fluid introduction grooves in the circumferential direction.

Two conflicting functions of sealing and lubrication of sliding faces are achieved for a long time. The sliding face of a rotating-side seal ringis provided with dynamic pressure generation groovesconfigured to communicate with the circumferential edge on the inner peripheral side of the sliding face and not to communicate with the circumferential edge on the outer peripheral side. A springis provided on the back side of a stationary-side seal ringfor pressing the stationary-side seal ringagainst the sliding face of the rotating-side seal ring. A spring holderis provided between the back side of the stationary-side seal ringand the spring

Mechanical seal

The purpose of the present invention is to provide a mechanical seal in which a stationary-side sealing ring can follow the movement of a rotating-side sealing ring to provide reliable sealing properties and by which the entire device can be made compact. A mechanical seal in which a rotating-side sealing ringattached to a shaftand a stationary-side sealing ringattached to a housingslide relative to each other and seal between the housingand the shaftincludes a casewhich is attached to the housingand which contains the stationary-side sealing ring, and a seal memberwhich is disposed between the caseand the stationary-side sealing ring, and the caseincludes a holding partwhich regulates the seal memberfrom moving to both sides in the axial direction thereof.

Both conflicting functions of sealing and lubrication of sliding faces are made compatible over an entire period from the time of startup through the time of steady operation. A pair of sliding parts that relatively slide on each other is provided, one of the sliding parts being a stationary-side seal ring, the other of the sliding parts being a rotating-side seal ring, the seal rings each having a sliding face S formed radially for sealing sealed fluid from leaking, at least one of the sliding faces S being provided with fluid introduction groovesconfigured to communicate with a first peripheral edge of the sliding face S and not to communicate with a second peripheral edge, and being provided with dynamic pressure generation grooves configured to communicate with the second peripheral edge of the sliding face S and not to communicate with the first peripheral edge.

Sliding component having fluid introduction groove and dynamic pressure generation groove

A mechanical seal includes: a rotation-side member and a seal case positioned and fixed to each other, and in which the engaged state can be released by bringing the rotation-side member and the seal case closer to each other in the axial direction.

In an embodiments, in a sealing face of at least one slide part of a pair of slide parts, a dynamic pressure generation grooveis provided so as to be separated not to communicate with a sealed fluid side and a leakage side by land portions on both sealing faces, between an endon the leakage side of the dynamic pressure generation grooveand the leakage side, a fluid introduction groovewhich communicates the dynamic pressure generation grooveand the leakage side is provided, and the cross-sectional area of the fluid introduction grooveis set smaller than the cross-sectional area of the dynamic pressure generation groove. The sealing faces are subjected to fluid lubrication and low friction in a steady operation, and leakage of the sealed fluid and entrance of dust into the sealing faces are suppressed.

Slide component

In an embodiment, in a slide component, dynamic pressure generation groovesare provided on a sealing face of at least one of a pair of slide partsso as to be isolated with no communication from the sealed fluid side and the leakage side by land portions R of both the sealing faces, and a plurality of independently-formed minute recessed sectionsis provided at positions on the sealing face IS between the dynamic pressure generation groovesand the leakage side, the positions being separated in the radial direction from the dynamic pressure generation grooves. The slide component can make the sealing faces fluid-lubricant and low frictional and prevent leakage of a sealed fluid and incoming of dust to the sealing faces at the time of normal operation.

In an embodiment, a sliding face of at least one sliding part of the pair of sliding parts is provided, along its entire circumference, with a trap groovefor trapping leakage fluid, located on a leakage side and spaced from the leakage side by a land. A dust entry reduction meansfor reducing entry of dust from the leakage side while allowing passage of fluid is formed between lands of the pair of sliding parts on the leakage side of the trap groove. At the sliding faces of the pair of sliding parts sliding relatively, entry of dust from the leakage side as well as liquid leakage to the leakage side are suppressed.

In an embodiment, a sliding component includes a pair of sliding parts (a stationary-side seal ringand a rotating-side seal ring) that relatively slide on each other and each have a sliding face S formed radially for sealing sealed fluid from leaking. The sliding face S of at least one sliding part is provided with dynamic pressure generation groovesspaced in a non-communicating manner from the sealed-fluid side and the leakage side by lands R of both sliding faces, and is provided with fluid introduction holesbetween leakage-side endsof the groovesand the leakage side, for communicating the groovesand the leakage side. Each fluid introduction holesis configured such that a dynamic-pressure-generation-groove-side openingopen to a corresponding one of the groovesis axially displaced from a leakage-side openingopen to the leakage side.

Provided is a mechanical seal includes a fluid introduction groove provided in a sealing face of a stationary sealing ring and having an opening portion which is opened to the sealed fluid and an end portion which is provided opposite to the opening portion. The end portion being located between respective sealing faces S, the fluid introduction groove introducing the sealed fluid from the opening portion to a clearance between the respective sealing faces S. The fluid introduction groove is provided to be inclined at an acute angle to the sealing face S of the stationary sealing ring in a direction from the end portion to the opening portion.

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.

Growing community of inventors

Tokyo, Japan

Hikaru Katori