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:
Jun. 18, 1985
Filed:
Jun. 01, 1984
Lennart Forslund, Upsala, SE;
Orjan Nilsson, Solna, SE;
Svenska Rotor Maskiner Aktiebolag, Nacka, SE;
Abstract
An ejector pump has a ringshaped nozzle slot directed radially outwards followed by a radially directed mixing zone interacting with a secondary channel and a radially directed diffuser slot. To achieve an improved performance, and especially one having a characteristic less dependent to decreases of working medium pressure the ejector pump is comprised of two mutually fixed blocks (1, 2) having each an end surface (4, 6). Said end surfaces (4, 6) are facing each other forming an annular slot (12). The surfaces of the nozzle slot and the diffuser slot are profiled in at least one of said end surfaces (6) separated by an annular groove (7) in said end surface, which groove (7) communicates with the secondary channel. The diffuser slot height adjacent the groove (7) is larger than the nozzle slot height (h.sub.o) adjacent said groove decreasing outwardly by the way of at least two bevels, first one having an angle of bevel .alpha..sub.1 =8.degree.-15.degree. and then one having an angle of bevel=4.degree.-8.degree., the ratio .alpha..sub.1 /.alpha..sub.2 amounting to 1.25-3.25 and each bevel .alpha..sub.2 having a width of at least 0.5 times the smallest width of the groove followed by an annular slot portion height (h.sub.1) amounting to 0.84-0.97 times the nozzle slot height (h.sub.o) adjacent the groove (7) along a distance of at least 0.8 times the smallest width of the groove (7) beginning at a distance of at most 4.9 times the smallest width of the groove from the outermost edge of nozzle (21).