|Publication number||USRE39346 E1|
|Application number||US 10/217,272|
|Publication date||Oct 17, 2006|
|Filing date||Aug 12, 2002|
|Priority date||Jul 13, 1998|
|Also published as||CN1158461C, CN1242479A, DE69919460D1, DE69919460T2, EP0972943A2, EP0972943A3, EP0972943B1, US6149413|
|Publication number||10217272, 217272, US RE39346 E1, US RE39346E1, US-E1-RE39346, USRE39346 E1, USRE39346E1|
|Original Assignee||Carrier Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (11), Referenced by (4), Classifications (16), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to a scroll compressor with a lubrication system for indirectly conveying lubricant to the back pressure chamber seals.
Scroll compressors are becoming widely utilized in refrigerant compression applications. Essentially, a scroll compressor consists of two scroll members with one orbiting relative to the other. Each scroll members includes a spiral wrap extending from a base. The spiral wraps interfit to define compression pockets. As the orbiting scroll moves relative to the non-orbiting scroll, the size of compression pockets becomes smaller and fluid trapped inside the pockets becomes compressed. There is a separating force generated from the compressed fluid tending to bias the two scroll members away from each other.
To counteract the separating force, it is known to tap a pressurized fluid to a chamber behind the base of one of the scroll wraps. Two seals typically define the boundaries of the chamber. Pressure in the back chamber acting over the scroll base creates a force tending to bias the scroll members back together, and acts in a direction opposite to the separating force discussed above.
The back pressure chamber seals are subject to many challenges and, in known compressors, often fail. One cause of seal failure is the lack of oil to lubricate seals.
It has been proposed in the past to deliver lubricant directly to the back chamber seals. In such proposals the oil needs to be additionally pressurized, thus creating complications. First, the compressor needs means for pressurizing the oil. Also, the seals may be damaged due to overcompression of the oil in the supply line. Also, the slight axial movement of the orbiting scroll can overcompress oil in the back chamber, creating another cause of seal damage.
In a disclosed embodiment of this invention, lubricant is indirectly supplied to the outer and inner back pressure chamber seals of the scroll compressor. That is, the lubricant impinges off of a surface adjacent to the back pressure chamber seals, and then is carried to the back pressure chamber seals. In this way, adequate lubrication is provided to the back pressure chamber seals.
In one embodiment, the lubricant is directed to an outer seal by impinging off the crankcase towers or compressor shell, and in a second embodiment, the lubricant is directed to an outer seal by impinging off an end face of the crankcase adjacent to the outer seal or off a surface of an antirotation coupling. In either case, an oil mist is created which is deposited on the rear face of the orbiting scroll plate as the orbiting scroll rotates. As the orbiting scroll continues to rotate the rear face of the orbiting scroll, which is covered by oil mist, is moved over and comes in contact with the stationary back chamber outer seal. Thus, providing effective oil lubrication of the seal.
Lubricant is preferably also supplied to the inner seal. In one embodiment, a passage extends through the hub of the orbiting scroll. The oil expelled through this passage impinges on an inner portion of the crankcase. Again, an oil mist is created by this impingement, and the mist is deposited on the rear face of the orbiting scroll, from which it is carried to the inner seal.
It should be noted that since the oil is deposited on the surface of the orbiting scroll while it is exposed to suction pressure, only minimal oil pressurization is required; just enough to create an issuing jet. Thus, no additional means to pressurize the oil are required except as provided by the existing oil delivery system.
Although the present invention as specifically disclosed has a back pressure chamber disposed behind the orbiting scroll, it should be understood that the invention also extends to a back pressure chamber defined behind the non-orbiting scroll.
These and other features of the present invention can be best understood from the following specification and drawings, the following of which is a brief description.
A scroll compressor 20 is shown in
A tap 30, shown schematically in
A passage 33 receives oil from chamber 25, and extends from the inner surface of the hub 28 to a downwardly extending tap 68. Oil leaving tap 68 impinges on end face 80 of the crankcase 38 adjacent to the outer seal 32.
Another tap 36 can be added. This tap extends downward. Oil leaving tap 36 impinges off the antirotation coupling 66, adjacent to the outer seal 32.
Another tap 35 extends from chamber 25 through the inner hub groove 50, and provides a passage for impinging oil off of a surface 37 on the crankcase. Another passage 40 extends from chamber 25 outwardly through an outer peripheral wall of the orbiting scroll 24. The oil which leaves the passage 40 through the opening 72 impinges off the crankcase tower 42 or off the scroll compressor shell surface 70.
In all of the above arrangements, the oil impingement creates a mist, and the mist is delivered onto a rear face 76 of the orbiting scroll. The rear face of the orbiting scroll then carries the mist to the inner and outer seals 32 and 34, and back chamber 74. The tap 35 provides lubrication for the inner seal 34 and the tap 68 and 36, and opening 72 provide lubrication for the outer seal 32. It should be understood that taps 35, 36, 68 or opening 72 can be used singularly, or in combination with each other. Further, by delivering the oil to the rear of the orbiting scroll at even one location, will improve the lubrication of both seals as the movement of the orbiting scroll causes the oil to be distributed to each and around the entire circumference of the respective seals.
As shown in
Preferred embodiments of this invention have been disclosed; however, a worker of ordinary skill in the art would recognize that certain modifications come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.
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|US4596521 *||Dec 7, 1983||Jun 24, 1986||Hitachi, Ltd.||Scroll fluid apparatus|
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|US6422843 *||Feb 13, 2001||Jul 23, 2002||Scroll Technologies||Oil supply cross-hole in orbiting scroll member|
|JPH06307354A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7329109 *||May 18, 2005||Feb 12, 2008||Scroll Technologies||Oil retention in scroll compressor pump members|
|US7836696 *||Nov 23, 2010||Denso Corporation||Fluid machine, rankine cycle and control method|
|US20060263226 *||May 18, 2005||Nov 23, 2006||Scroll Technologies||Oil retention in scroll compressor pump members|
|US20070245732 *||Apr 12, 2007||Oct 25, 2007||Denso Corporation||Fluid machine, rankine cycle and control method|
|U.S. Classification||418/55.5, 418/55.6, 418/55.4, 418/99, 418/55.1, 418/57|
|International Classification||F04C18/02, F04C29/02, F04C18/04, F04C27/00, F25B1/04, F04C18/00|
|Cooperative Classification||F04C29/023, F04C27/005|
|European Classification||F04C29/02C, F04C27/00C|
|Jun 2, 2008||REMI||Maintenance fee reminder mailed|
|Nov 23, 2008||LAPS||Lapse for failure to pay maintenance fees|