Mechanical seal

Abstract

To provide a mechanical seal capable of accurately grasping a cooling state of flushing fluid at a sliding part of a rotary sealing ring and a static sealing rIng.SOLUTION: A mechanical seal 1 is equipped with a rotary side unit 2 having a rotary sealing ring 18, and a static side unit 3 having a static sealing ring 33. Sliding parts 18a and 33a of the rotary sealing ring 18 and the static sealing ring 33 are cooled by flushing fluid. The mechanical seal 1 is equipped with a first temperature detection part 71 that is provided in the static side unit 3 and detects a first temperature of the flushing fluid before cooling the slide parts 18a and 33a, and a second temperature detection part 72 that is provided separately from the first temperature detection part 71 in the static side unit 3 and detects a second temperature of the flushing fluid after cooling the slide parts 18a and 33a.SELECTED DRAWING: Figure 1

Claims

[Claim 1] A rotating side unit having a rotating sealing ring is provided to be integrally rotatable on the rotating shaft of a rotating machine, The rotating shaft is surrounded by a stationary side unit provided in the casing of the rotating device, which has a stationary sealing ring on which the rotating sealing ring slides, A mechanical seal in which the sliding portion between the rotating sealing ring and the stationary sealing ring is cooled by a flushing fluid, A first temperature detection unit is provided in the stationary unit for detecting the first temperature of the flushing fluid before it cools the sliding portion, A mechanical seal comprising a second temperature detection unit provided separately from the first temperature detection unit in the stationary unit, which detects the second temperature of the flushing fluid after the sliding portion has been cooled. [Claim 2] The stationary unit is, A cylindrical seal case for separating the internal and external areas of the rotating machine, A first channel is formed at a predetermined location in the circumferential direction of the seal case and supplies the flushing fluid to the internal region of the machine before it cools the sliding portion, The device further includes an adapter ring provided in the seal case within the internal region of the machine, which forms a second channel that supplies the flushing fluid from the first channel toward multiple locations in the circumferential direction of the sliding portion, The adapter ring has a mounting hole into which the second temperature detection unit is inserted from the radially outer side toward the radially inner side of the adapter ring. The mechanical seal according to claim 1, wherein a tapered inner circumferential surface is formed at the radially outer opening end of the mounting hole, the diameter of the mounting hole gradually increases from the radially inner side to the radially outer side. [Claim 3] The aforementioned adapter ring is An inlet passage is located radially outward from the mounting hole and communicates with the mounting hole, The mechanical seal according to claim 2, further comprising a pressure loss portion that causes a pressure loss in the flushing fluid flowing into the inlet passage from the radially outer side of the inlet passage. [Claim 4] The mechanical seal according to claim 2 or 3, wherein, with the second temperature detection unit inserted into the mounting hole, the temperature measurement point of the second temperature detection unit is located on the machine interior side of the sliding portion. [Claim 5] The seal case has a plurality of holes formed in the circumferential direction that can be used as the first flow path. One of the multiple holes is designated as the first flow path. The mechanical seal according to claim 2 or 3, wherein at least one of the plurality of holes is an insertion hole into which the second temperature detection unit is inserted. [Claim 6] The stationary unit is, A cylindrical seal case for separating the internal and external areas of the rotating machine, A first channel is formed at a predetermined location in the circumferential direction of the seal case and supplies the flushing fluid to the internal region of the machine before it cools the sliding portion, The device further includes an adapter ring provided in the seal case within the internal region of the machine, which forms a second channel that supplies the flushing fluid from the first channel toward multiple locations in the circumferential direction of the sliding portion, The second flow path is formed radially outward of the adapter ring and has an annular flow path that allows the flushing fluid to flow circumferentially before being supplied to the sliding portion. The mechanical seal according to claim 1 or claim 2, wherein the temperature measurement point of the first temperature detection unit is located within the annular flow path. [Claim 7] The seal case has a plurality of holes formed in the circumferential direction that can be used as the first flow path. One of the multiple holes is designated as the first flow path. The mechanical seal according to claim 6, wherein at least one of the plurality of holes is an insertion hole into which the first temperature detection unit is inserted.

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