Reversible Double Delivery Pump for Dishwasher Flow Balancing
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Solution Overview
Problem
Existing double delivery centrifugal pumps for dishwashers and glasswashers require deviating means to split and adjust fluid flows to upper and lower washing arms, which is inefficient and not adaptable to different flow rate requirements between the two types of appliances.
Innovation Solution
A centrifugal pump with two delivery pipes in diametrically opposite positions, allowing for different passage sections and reversible assembly to accommodate varying flow rates without additional deviating means, and constructed from synthetic plastic for cost-effectiveness and ease of assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If deviating means (valves or T-fittings) are used to split and adjust fluid flows to upper and lower washing arms, then the flow rates can be controlled, but the device complexity increases and additional components are required
Solution Approach 1:
The patent merges the flow splitting function directly into the pump body by integrating two delivery pipes with different passage sections into a single pump structure. This eliminates the need for separate valves or T-fittings, reducing device complexity while maintaining flow rate adjustment capability through the inherently different pipe dimensions
Solution Approach 2:
The pump body is designed with multi-functionality by incorporating both flow splitting and flow rate adjustment functions within a single component. The two delivery pipes with different passage sections allow the same pump to serve different appliance types (dishwashers and glasswashers) without requiring additional deviating means
2Ease of manufacture
If a single pump design is used for both dishwashers and glasswashers, then manufacturing cost decreases, but adaptability to different flow rate requirements is reduced
Solution Approach 1:
The pump body incorporates local quality differences through two delivery pipes with deliberately different passage sections. This allows a single standardized pump design to provide different flow rates to upper and lower washing arms, enabling the same pump to be used in both dishwashers (where upper arm needs greater flow) and glasswashers (where lower arm needs greater flow) without modification
3Adaptability or versatility
If two delivery pipes with different passage sections are integrated into the same pump body, then adaptability to different appliance types is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by designing the two delivery pipes with specifically different passage section dimensions. This intentional parameter differentiation allows the same pump body to provide different flow rates without requiring complex adjustable mechanisms, balancing manufacturing precision requirements with adaptability needs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and adaptable fluid distribution to either upper or lower washing arms without additional components, ensuring reliable sealing and simplified maintenance, while being cost-effective and scalable for different appliance types.
Implementation Method 1
a centrifugal impeller (5) and provided with a first delivery pipe (6) and a second delivery pipe (7) obtained on the pump body (4) in diametrically opposite, tangential positions with respect to a rotation axis (A) of the impeller (5)
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5
AI summary
A double delivery pump (1) for an electric household appliance including a pump body (4) housing a centrifugal impeller and provided with a first delivery pipe (6) and with a second delivery pipe (7) having passage sections which are different from one another and obtained on the pump body in tangential, diametrically opposite positions with respect to a rotation axis of the impeller, and with first and second fastening means (9, 12) to a casing (10) of the electric household appliance designed to be selectively used to assemble the pump body, either with the first delivery pipe arranged above and with the second delivery pipe arranged below the axis of rotation (A) of the impeller and vice versa, so that the pump depending on which fastening means (9, 12) are selected, may be used either on a professional dishwasher (3a) or glasswasher (3b). The pump body includes a cup-shaped scroll (20), a closing lid (40) of a mouthpiece (22) of the scroll, which may be housed in a seat defined by an annular collar (30) of the scroll and axially carrying a suction pipe, the lid arranged in use in axial abutment against a bottom wall (35) of the annular collar with the interposition of a sealing ring (43), and a threaded locking ring (50), coupled with a threaded segment (37) of the collar to axially press in use the lid (40) against the bottom wall (35), uniformly along a peripheral edge (44) of the lid.