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:
Oct. 23, 1990
Filed:
Nov. 02, 1988
Hans Haverkamp, Oerlinghausen, DE;
Hanning Electro-Werke GmbH & Co., Oerlinghausen, DE;
Abstract
An arrangement for emptying a liquid collection tank in household appliances that use water such as washing machines or dish washers. A centrifugal pump is provided with a housing and a floating impeller. An axial suction connection with a tubular connector extends out of the liquid collection tank which is provided on the appliance. The liquid conveyed by the pump is diverted by a radial delivery connection on the housing. A recirculation channel is connected between one end of the radial delivery connection and the suction connection of the pump, for the purpose of diverting liquid that is conducted into the vicinity of the suction connection and empties into the tubular connector. This recirculation channel has a cross-section corresponding to the delivery connection and the cross-section of the suction connection. The recirculation channel, furthermore, is shaped into the housing in the form of an open gap toward the impeller, and has a pressure difference between its ends for circulating liquid in the pump housing to eliminate noise effects in the pump, and to prevent foreign matter from depositing in the recirculation channel and clogging that channel.