Bilge Pump Concealed Air-Lock Vent Design
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Solution Overview
Problem
Centrifugal pumps often experience air lock issues due to entrapped air in the pump housing, preventing the impeller from engaging with water, which hinders the pumping process.
Innovation Solution
Incorporating an anti-airlock vent or valve assembly with a vent hole in the pump body and strainer assembly, featuring tab receiving and strainer retaining components that allow air to escape while concealing the vent hole to prevent water from squirting out when the pump is operational.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent hole is provided in the pump body to allow air to escape, then air lock is prevented and the pump can start operation, but water may leak externally during normal operation
Solution Approach 1:
The vent hole is concealed by the strainer assembly before the pump operates. The strainer retaining tab with raised rim is positioned to cover the vent hole during assembly, preventing water from escaping while allowing air to escape during the startup phase when the pump is filling with water.
Solution Approach 2:
The strainer retaining tab acts as an intermediary element between the vent hole and the external environment. It selectively allows air to pass through during startup while blocking water during operation, mediating between the need for air escape and the need to prevent water leakage.
2Object-generated harmful factors
If the vent hole is concealed to prevent water leakage, then water squirting is prevented, but air may become trapped causing air lock
Solution Approach 1:
The strainer assembly is designed to be movable relative to the pump body, allowing it to be in different positions during assembly/disassembly versus operation. During operation, the strainer covers the vent hole; during maintenance, it can be removed to access the vent hole for air evacuation if needed.
Solution Approach 2:
The pump body is pre-configured with the vent hole in a location that allows air to escape during the initial filling process. The strainer assembly is designed with the raised rim to automatically cover this vent hole once the pump is assembled and operational, ensuring air can escape during startup but water is blocked during operation.
3Object-generated harmful factors
If the strainer retaining tab is designed to conceal the vent hole, then water leakage is prevented, but the tab must be configured with precise dimensions and engagement features
Solution Approach 1:
The strainer assembly is segmented into distinct components: the strainer base with slots and the retaining tab with raised rim. This segmentation allows the retaining tab to be designed as a separate feature that can be molded or formed with precise dimensions, ensuring proper engagement with the pump body opening while concealing the vent hole.
Solution Approach 2:
The strainer retaining tab serves multiple functions: it secures the strainer assembly to the pump body through engagement with the opening, conceals the vent hole to prevent water leakage, and maintains the structural integrity of the assembly. This multi-functionality is achieved through its raised rim configuration that engages with the pump body opening.
Data Source
Figure 1a~1b
Figure 2a~2b
AI summary
The pump has a pump body having a pump body portion with a vent hole allowing air entrapped in the pump body to bleed out to atmosphere and liquid to fill the pump body in order to get the pump running, and includes a tab receiving portion having a rim defining an opening; and a pump/strainer assembly that includes a base with slots/openings formed therein to receive and strain liquid for pumping, and includes a strainer retaining tab with a raised rim received in the opening of the tab receiving portion and circumferentially engaged by the rim of the opening to hold together the pump/strainer assembly and the pump body. The tab receiving portion and the strainer retaining tab are dimensioned to conceal the vent hole and prevent the liquid from bleeding through the vent hole and squirting outside of the pump body when the pump is running.