Fluid Pump Dual Check Valve Venting for Overflow Control

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Solution Overview

Problem

Automatic fluid pumps face issues with poor appearance, contamination, slow fluid discharge during overflow, and potential moisture intrusion due to air holes, as well as reduced sealing force and increased remaining fluid discharge from foreign matter adhesion, leading to operational inefficiencies.

Innovation Solution

An automatic fluid pump design featuring a pump body with a liquid channel, a valve case, and dual check valves (main and auxiliary) that maintain internal pressure and prevent overflow by allowing a controlled amount of fluid into a retention portion, ensuring smooth air inflow and effective sealing through the dual valve action and O-ring sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If an air hole is formed at one side of the suction pipe to remove remaining fluid using the siphon effect, then fluid discharge speed is improved, but the suction pipe becomes contaminated and appearance deteriorates

Engineering Contradiction:

Improvefluid discharge speedVSAvoidcontamination of suction pipe

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The invention extracts the air introduction function from the suction pipe by providing a separate air introduction hole in the pump body. This separates the fluid discharge function (through suction pipe) from the air introduction function, allowing rapid fluid discharge while preventing contamination of the suction pipe.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If an air hole is formed in the pump body to prevent overflow, then overflow prevention is improved, but moisture and foreign substances can intrude into the battery chamber and board

Engineering Contradiction:

Improveoverflow preventionVSAvoidmoisture intrusion into battery chamber

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention applies different sealing qualities to different locations: the air introduction hole is sealed with a seal member to prevent moisture intrusion, while the fluid discharge path remains open. This localized sealing approach maintains overflow prevention capability while protecting the battery chamber from moisture.

Inventive Principle:

Principle #3Local quality

3Reliability

If external air is supplied through an air hole during overflow, then overflow discharge is enabled, but it takes lots of time to discharge fluid

Engineering Contradiction:

Improveoverflow discharge capabilityVSAvoidfluid discharge time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The pump body is pre-filled with air through the air introduction hole before pumping operation begins. This preliminary air supply creates immediate siphon effect capability, allowing rapid fluid discharge during overflow without time delay for air introduction.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If foreign matter adheres to the shutter (check valve), then sealing force is reduced, but this causes increased remaining fluid discharge and reduced pumping power

Engineering Contradiction:

Improvesealing force of check valveVSAvoidpumping power

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention introduces air through the air introduction hole as an intermediary substance that prevents foreign matter from adhering to the check valve shutter. This air layer acts as a mediator that maintains sealing force while allowing continuous pumping operation without power reduction.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

The design prevents overflow and foreign substance intrusion, maintains internal pressure, and ensures efficient fluid discharge without contamination, improving the pump's appearance and operational reliability by using dual check valves and O-ring sealing.

Implementation Method 1

an auxiliary check valve (180) disposed in a guide tube (155) to be movable up and down to open/close the air hole (152)

Methodology Applied

Scientific EffectAir introduction through valve mechanism: Valve

Implementation Method 2

dual check valves (main and auxiliary) that maintain internal pressure and prevent overflow by allowing a controlled amount of fluid into a retention portion

Methodology Applied

Scientific EffectPressure maintenance through dual valve action: Valve

Implementation Method 3

O-ring sealing

Methodology Applied

Scientific EffectSealing through O-ring: Mechanical Fastener

Data Source

PatentUS11326614B2Automatic fluid pump

Publication Date: 2022.05.10 DUKSHIN CORP

AI summary

An automatic fluid pump includes a pump body having a liquid channel and a mounting channel, the liquid channel having an inlet and an outlet and connected to a suction pipe and a delivery hose, respectively. A motor fan is disposed at a lower end of the suction pipe. A power controller is coupled to the pump body and circuit-connected to a battery, a terminal plate, and a switch. A valve case is coupled to the mounting channel in the form of a hopper formed at a lower end thereof with an inclined portion having an air hole. A valve case cap is coupled to the valve case. A main check valve is disposed on a lower surface of the valve case cap to open/close the through-holes. An auxiliary check valve is vertically moved up and down between the mounting channel and the air hole to open/close the air hole.