Shaft seal apparatus

Abstract

A pumping ring (46), producing an axial flow of a sealed fluid so that a sealed fluid positioned in a sealed space (33) flows along the central axial direction of a rotating shaft (6), is secured to a rotating shaft (6) in an axial position different than a rotating ring (56). A discharge hole (14) is formed in the inner circumferential surface of a seal cover (8) positioned on the downstream side of the axial flow of the sealed fluid resulting from the rotation of the pumping ring (46). An inflow hole (15) is formed in a position on the upstream side of the axial flow of the sealed fluid resulting from the rotation of the pumping ring (46). The configuration is such that sealed fluid discharged from the discharge hole (14) returns to the interior of the sealed space (33) from the inflow hole (15). A rectifying member (18) is provided so as to protrude toward the inside in a radial direction in the inner circumferential surface of the seal cover (8) where the discharge hole (14) is formed. The rectifying member retains the flow of the sealed fluid along the rotational direction of a retainer (52) and orients the sealed fluid toward the discharge hole (14).

Description

technical field [0001] The present invention relates to a shaft sealing device, and more particularly to a shaft sealing device capable of effectively cooling a rotating ring and a stationary ring sliding mutually. Background technique [0002] For example, in a shaft seal constituted by a mechanical seal shown in Patent Document 1 below, a partial impeller for pumping fluid to circulate itself is attached to a rotating shaft. In addition, on the inner peripheral surface of the stuffing box located on the outer periphery of the rotating shaft, inlet holes and outlet holes are provided at positions different from the axial direction. Therefore, the rotation of the rotating shaft generates an axial flow from the inlet hole to the outlet hole, thereby cooling the mechanical seal composed of the rotating ring and the stationary ring. [0003] However, in the existing shaft sealing device, since the thrust to discharge the sealing fluid from the discharge hole is only the pumpin...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing shaft sealing device, since the thrust to discharge the sealing fluid from the discharge hole is only the pumping action performed by a part of the impeller, the discharge of the fluid is not sufficient, and the fluid circulation by the pumping function is not sufficient. carried out, it is difficult to cool effectively

Especially when radially extending discharge holes have to be formed instead of axially extending discharge holes, the discharge force of the fluid is insufficient

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