DISHWASHER

• US 3,612,714 A
• Filed: 10/16/1969
• Issued: 10/12/1971
• Est. Priority Date: 10/16/1969
• Status: Expired due to Term

• Current Assignee: James G. Ruspino
• Original Assignee: James G. Ruspino
• Inventors: Ruspino, James G.
• Primary Examiner(s): Raduazo, Henry F.
• Application Number:
  US04/866,852
• Time in Patent Office: 726 Days
• Field of Search: 134/186,188,191,182 417/211.5,224 415/209,210,211,501,53,116,119
• US Class Current: 415/116
• CPC Class Codes: A47L 15/4225 Arrangements or adaption of recirculation or discharge pumps
• CPC Class Codes: F04D 13/14 the pumps being all of centrifugal type deviation valves F04D15/0016
• CPC Class Codes: F04D 29/426 especially adapted for liquid pumps
• CPC Class Codes: F04D 29/448 bladed diffusers

Abstract

A dishwasher having a recirculation centrifugal pump impeller operated to discharge liquid at the discharge periphery of the impeller and with a discharge passage adjacent this periphery to receive liquid therefrom and having a height substantially less than the corresponding height of the spaced blades of the impeller so that liquid will flow at a greater radial velocity when leaving the impeller than in passing through the blades of the impeller.

Claims

1. A dishwasher, comprising:

a washing chamber having a liquidcollecting sump;

a liquid recirculation centrifugal pump having an impeller including blades rotatable about an axis and having a generally circular discharge periphery adjacent the discharge portion of said blades;

means providing an entRance for liquid to said blades adjacent said axis;

means providing an exit conduit including a diffusing exit annulus surrounding said impeller discharge periphery and substantially coaxial therewith and having a height normal to the flow through said annulus that is less than the corresponding height of said blades at said periphery and an exit passage all connected in series with each other, said impeller being rotatable in a reverse direction during drainage of liquid from said washing chamber; and

air vent passage means having one end opening between said impeller discharge periphery and the exit annulus and a second end opening above the liquid level in said chamber.

2. The dishwasher of claim 1 wherein said vent passage means extends through said exit passage.

3. The dishwasher of claim 2 wherein said exit passage is provided with spaced flow-straightening baffles angled to straighten out the generally spiral flow of liquid from said impeller, said baffles each having a substantial thickness defined by sidewalls, and said vent passage means extends through one of said baffles between its said sidewalls so as not to interfere with liquid flow in said exit passage between any pair of said baffles.