Patent US3750840A successfully refreshed from Google Patents.
US3750840A
Expired / Lapsed
US
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Sound absorber for compressors
Assignee: Danfoss AS
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Filing: 1971-09-27
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Granted: 1973-08-07
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Expires: 1991-09-27
Abstract
Abstract The invention relates to a sound absorber assembly for encased refrigeration compressors. Two cup-shaped members are slidably and telescopically joined to form a main chamber of selectively variable size. A partition in one of the cup elements divides the main chamber into two sub-chambers and the partition is movable to allow any desired volume ratio between the sub-chambers to be selected. A throttle passage having the opposite ends thereof in respective fluid communication with the sub-chambers is incorporated into or connected to the partition.
Inventors
- 👤 B Holme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:34
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/0027; F04B39/0055; F04B39/0072; Y; Y10; Y10S; Y10S181/00; Y10S181/403
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A sound absorber assembly for compressors comprising two cup members with one cup member telescopically disposed in the other to form a main enclosed chamber, a partition element mounted in one of said cup members to divide said main chamber into a total of two sub chambers having a selected volume ratio to provide optimum noise absorption characteristics, said partition element including a planar portion with a flange in surrounding reation thereto, an insert in abutting engagement with said planar portion and having a sinuous shaped recess which forms an enclosed throttle passage in cooperation with said planar portion, an aperture in said planar portion providing fluid communication between one end of said throttle passage and one of said subchambers and an aperture in said insert providing fluid communication between the other end of said throttle passage and the other of said subchambers.
Claim 2
Dependent Claim
143 words
A sound absorber assembly for compressors comprising two cup members with one cup member telescopically disposed in the other to form a main enclosed chamber, a partition element mounted in one of said cup members to divide said main chamber into a total of two sub chambers having a selected volume ratio to provide optimum noise absorption characteristics, said partition element including a planar portion with a flange in surrounding reation thereto, an insert in abutting engagement with said planar portion and having a sinuous shaped recess which forms an enclosed throttle passage in cooperation with said planar portion, an aperture in said planar portion providing fluid communication between one end of said throttle passage and one of said subchambers and an aperture in said insert providing fluid communication between the other end of said throttle passage and the other of said subchambers.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |