Dishwasher pump
First Claim
Patent Images
1. A dishwasher pump comprising:
- a drive motor;
a pump housing;
a first pumping chamber located within said housing having fluid ingress and egress openings;
a second pumping chamber located within said housing having fluid ingress and egress openings, said second chamber axially spaced from said first pumping chamber;
a first impeller rotated by said motor for moving fluid between said first pumping chamber'"'"'s ingress and egress openings, said first impeller including a cover having an opening defining a fluid inlet portion;
a second impeller rotated by said motor for moving fluid between said second pumping chamber'"'"'s ingress and egress openings; and
throttling means fixed to said cover adjacent said fluid inlet portion of said first impeller and rotatable therewith, said throttling means including flange means extending transversely relative to the axis of rotation for reducing the impeller fluid inlet area to lower pump noise by interrupting air pockets entrained in fluid entering the fluid inlet portion of said first impeller.
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Accused Products
Abstract
The present invention is directed to a two chamber dishwasher pump wherein the pumping noise associated with recirculation is substantially lowered by reducing the intake area to the recirculation impeller thereby interrupting air pockets formed in the fluid while recirculating. In addition the noise associated with fluid drainage is minimized by an aperture between the drain chamber inlet and the drain outlet which allows fluid to flow from the inlet to the outlet thereby interrupting air pockets in the drain line which create the noise. In addition, fluid flows through the aperture in an opposite direction to that described above in order to relieve excessive pressure in the drain line during recirculation.
25 Citations
3 Claims
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1. A dishwasher pump comprising:
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a drive motor; a pump housing; a first pumping chamber located within said housing having fluid ingress and egress openings; a second pumping chamber located within said housing having fluid ingress and egress openings, said second chamber axially spaced from said first pumping chamber; a first impeller rotated by said motor for moving fluid between said first pumping chamber'"'"'s ingress and egress openings, said first impeller including a cover having an opening defining a fluid inlet portion; a second impeller rotated by said motor for moving fluid between said second pumping chamber'"'"'s ingress and egress openings; and throttling means fixed to said cover adjacent said fluid inlet portion of said first impeller and rotatable therewith, said throttling means including flange means extending transversely relative to the axis of rotation for reducing the impeller fluid inlet area to lower pump noise by interrupting air pockets entrained in fluid entering the fluid inlet portion of said first impeller. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeAnvil Technologies LLC
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Original AssigneeMaytag Corporation (Whirlpool Corporation)
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InventorsSparks, James E., Ellingson, David I., Scott, Herbert E.
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Primary Examiner(s)Look, Edward K.
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Assistant Examiner(s)Verdier, Christopher M.
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Application NumberUS07/612,800Time in Patent Office657 DaysField of Search415/52.1, 415/119, 415/121.2, 415/144, 415/152.1, 415/152.2, 415/153.1, 416/93, 416/223 A, 416/223 B, 416/231 R, 416/179, 416/182, 416/185, 416/181, 134/115 G, 134/176, 134/179, 134/195US Class Current415/119CPC Class CodesF04D 13/14 the pumps being all of cent...F04D 29/2216 Shape, geometry F04D29/2211...F04D 29/426 especially adapted for liqu...F04D 29/448 bladed diffusersF04D 29/669 especially adapted for liqu...
