Back to results
US 4,591,311 AGranted
Fuel pump for an automotive vehicle having a vapor discharge port
AssigneeNippondenso Co., Ltd.
InventorsTakeshi Matsuda, Masasi Miyamoto, Toshihiro Takei
Life of this patent
Estimating the term…
Abstract
A pump apparatus of a regenerative type having a vapor discharge port for avoiding a vapor lock. A portion of a circumferential fluid passage of a pump is enlarged within an angular range of 180.degree. measured from a suction port of the pump and the vapor discharge port is formed at a downstream end of such an enlarged fluid passage, so that fluid flow speed flowing through the enlarged fluid passage is relatively slow and vapored fluid can be effectively exhausted out of the fluid passage.
Claims6
A pump apparatus comprising:
- a regenerative type pump including a pump housing, an impeller rotatably housed in said pump housing and suction and discharge ports defined by said pump housing and spaced circumferentially of said impeller;
- said impeller having a substantially disc-like shape and being provided with a plurality of circumferentially spaced vanes formed at an outer periphery of said impeller;
- said pump housing cooperating with said impeller to define a circumferential fluid passage surrounding said vanes and extending between said suction port and said discharge port, said circumferential fluid passage having an enlarged portion formed at a low pressure side of said circumferential fluid passage beginning from said suction port and extending for an angular range of less than 180.degree. measured from said suction port, a cross-sectional area of said enlarged portion being larger than the remainder of said circumferential fluid passage;
- means disposed in said circumferential fluid passage between said suction and discharge ports to provide a circumferential seal therebetween;
- and
- a vapor discharge port formed in said pump housing and at a downstream end of said enlarged portion for communicating said fluid passage with the outside thereof.
3 more elements
Dependencies are inferred from the claim text.