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US4758136A Expired / Lapsed US ⏱️ 0.0 years remaining

Screw compressor lubrication channel for lubrication of a rotor bearing

Assignee: SVENSKA ROTOR MASKINER PO BOX 15085 S-104 65 STOCKHOLM SWEDEN A CORP OF SWEDEN AB
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Filing: 1986-03-21
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Granted: 1988-07-19
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Expires: 2006-03-21
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Abstract

Abstract A screw compressor lubrication channel for lubrication of a rotor bearing on the compressor's low pressure side, which is supplied with refrigerant droplets containing oil accompanying the inlet gas. This kind of lubrication is usually carried out by permitting a limited amount of gas and oil to flow from the high pressure side to the low pressure side via the bearings located on the low pressure side, and further to the inlet. By this working mode compressor capacity as well as compression work deposited is lost. This is avoided when the compressor according to the present invention is provided with a special, smaller inlet channel (7), which via the rotor bearing (3) opens out in a specific inlet port (8) located at an expanding rotor thread presenting a lower pressure than the inlet (6) pressure of the compressor.

Inventors

  • 👤 Roland Pamlin
  • 👤 Lars Sjoholm

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 08:14
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/02

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 116 words
In a screw compressor, means for lubrication of a rotor bearing (3) on the compressor's low pressure side, which is supplied with a refrigerant containing oil for lubrication of the compressor's working chamber, the screw compressor having an inlet channel (6) and a main inlet port (11), the improvement wherein: the screw compressor is provided with a special, additional smaller inlet channel (7, 9) which is smaller than said first--mentioned inlet channel (6), which smaller inlet channel (7, 9) passes axially through said rotor bearings (3) from one end to the other, and opens out in a specific inlet port (8, 8') located at an expanding rotor thread with lower pressure than the compressor's inlet pressure.
Claim 2
Dependent Claim 116 words
In a screw compressor, means for lubrication of a rotor bearing (3) on the compressor's low pressure side, which is supplied with a refrigerant containing oil for lubrication of the compressor's working chamber, the screw compressor having an inlet channel (6) and a main inlet port (11), the improvement wherein: the screw compressor is provided with a special, additional smaller inlet channel (7, 9) which is smaller than said first--mentioned inlet channel (6), which smaller inlet channel (7, 9) passes axially through said rotor bearings (3) from one end to the other, and opens out in a specific inlet port (8, 8') located at an expanding rotor thread with lower pressure than the compressor's inlet pressure.
Claim 3
Dependent Claim 36 words
The screw compressor according to claim 1, wherein said bearing (3) has opposite ends, and wherein one end of said bearing (3) is connected to said inlet channel (6) close to said main inlet port (11).
Claim 4
Dependent Claim 27 words
The screw compressor according to claim 1, wherein said special, smaller inlet channel (7, 9) passes oil mixed with refrigerant in liquid form through said bearing (3).
Claim 5
Dependent Claim 27 words
The screw compressor according to claim 2, wherein said special, smaller inlet channel (7, 9) passes oil mixed with refrigerant in liquid form through said bearing (3).

References Cited (Backward Citations)

US3899271A Cited
US4394113A Cited
US4439121A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1991-07-19 1992-01-18 1992-07-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1995-07-19 1996-01-18 1996-07-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1999-07-19 2000-01-18 2000-07-19 $7700.00 Window Closed / Lapsed

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