SHAFT SEAL PART FOR OIL-COOLED SCREW COMPRESSOR

Japanese Patent JP2014163319

A

PROBLEM TO BE SOLVED: To provide shaft seal part structure capable of reducing start-up resistance of a compressor body.SOLUTION: A ring spacer 14 of which inner diameter is slightly larger than an outer diameter of a driving shaft 45 and smaller than an outer diameter of a rotating part 181 of a mechanical seal 18 is arranged between a bearing 13 in a bearing chamber 11 and the mechanical seal 18, a space at the mechanical seal 18 side in respect to the ring spacer 14 is communicated with an oil feeding passage 16 to form an oil reservoir space 19. Although a fine clearance δ is formed between an inner peripheral surface of the ring spacer 14 and an outer peripheral surface of the driving shaft 45, a feeding amount of oil fed through the oil feeding passage 16 upon operating a compressor body exceeds over an amount of leaked oil through the fine clearance δ and then the oil reservoir space 19 is filled with lubricant oil. On the other hand, when oil feeding through the oil feeding passage 16 stops due to stopping of the operation of the compressor body, oil surface is lowered down to a line L due to oil leakage through the fine clearance δ, thereby a start-up resistance accompanying agitation of lubricant oil is substantially reduced while lack of oil at the mechanical seal 18 is prevented.

JPS59121492	[Title of the device] Scroll type fluid machine
JP7270102	compressor
WO/2006/127535	ROTATING VANE COMBUSTION ENGINE

KANEKO KATSU
KANBAYASHI TORU

JP2013035917A

September 08, 2014

February 26, 2013

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HOKUETSU KOGYO CO

F04C27/00; F04C18/16

JP2008303781A	2008-12-18
JPH06307369A	1994-11-01

Masaaki Ogura
Tetsuro Tomura

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