Mechanical sealing device

Abstract

Disclosed is an outside-type split mechanical sealing device, wherein sealed surfaces can be jointed in a flat and tight manner even using a seal ring having a thickness that varies in the radial direction, so that an appropriate sealing performance can be exhibited. In the mechanical sealing device, circumferential grooves (31-34, 71-74) are formed on the outer peripheral surfaces of seal rings (30, 70) containing thick areas (38, 78) and thin areas (39, 79), and circumferential grooves (51-54, 91-94) are formed on the inner peripheral surfaces of holders (50, 90) so as to correspond to the circumferential grooves (31-34, 71-74). O-rings (41-44, 81-84) are provided between the circumferential grooves (31-34, 71-74) of the seal rings (30, 70) and the circumferential grooves (51-54, 91-94) of the holders (50, 90). Split portions of the holders (50, 90) are connected by bolts (55, 95,) used for the thick areas (38, 78) and bolts (56, 96) used for the thin areas (39, 79), to annularly form the holders (50, 90). Thus, split portions of the seal rings (30, 70) can be tightly jointed, and the seal rings (30, 70) can be annularly formed.

Description

technical field [0001] The present invention relates to a mechanical seal device, in particular to an outer type and split type mechanical seal device. Background technique [0002] Conventionally, in the case of a mechanical seal used in a fluid conveying device (transfer device), when the conveying device is a large device, it takes time and effort to replace it. Therefore, in order to replace the mechanical seal without dismantling the conveying equipment, it is proposed to form the mechanical seal into a divisible structure, and it has been put into use (for example, refer to PCT International Publication No. WO2007 / 136453 (Patent Document 1) figure 1 ). [0003] In a split type mechanical seal, generally speaking, if the pressure of the sealed fluid is applied to the inner diameter side of the seal ring that cannot be fixed with bolts, the force will act in the direction of the split surface of the seal ring, causing the The sealed fluid is easy to leak from the divid...

AI Technical Summary

Problems solved by technology

However, such an elastic member having a shape covering the entire peripheral surface of the seal ring basically needs to prepare an elastic member for each seal ring due to differences in the diameter of the seal ring, etc., so that the manufacturing cost becomes high. As a dedicated part, the price is also higher

In addition, it is troublesome to manage parts

In addition, more specifically, in order to manufacture such a dedicated elastic member, it is necessary to manufacture a dedicated mold, and therefore, it takes time and effort to manage the mold.

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