The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 1989
Filed:
Jan. 07, 1988
Bernard Zimmern, East Norwalk, CT (US);
Other;
Abstract
In a positive displacement compressor, first and second liquid injection holes are provided. The first hole is subjected substantially to the intake pressure. The other is subjected to a higher average pressure. A valve controls flow towards the first hole. When the discharge pressure is high, injection occurs through the second hole, the valve is closed. Under such operating conditions, the compressor has a good efficiency because the gas resulting from flashing of the injected liquid in the compressor needs only to be recompressed from said higher average pressure instead from said intake pressure, and does not take up space in the compressor which would limit the intake capacity of the compressor. If the discharge pressure decreases, the valve opens, allowing for injection through the first hole, thus eliminating the risks of seizure in the compressor if the injection liquid is at a pressure lower than the pressure in front of the second orifice, thus at a pressure insufficient for injection through the second orifice. The valve is a check-valve biased by a spring.