Vacuum Bypass Venting for Motor Cooling During Liquid Shutoff

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Solution Overview

Problem

Conventional wet/dry vacuum cleaners face issues with liquid ingestion into the motor impeller, leading to overheating and potential damage, as existing float-based and differential pressure diaphragm systems are either complex and expensive or inefficient in preventing liquid from entering the motor.

Innovation Solution

A bypass vent system is introduced, which allows controlled airflow to the impeller chamber while preventing liquid ingestion by using a float to restrict liquid entry, and a bypass vent area to maintain motor cooling and prevent liquid from entering the impeller.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a float-based restrictor system is used to prevent liquid ingestion, then liquid prevention is improved, but motor cooling is worsened due to restricted airflow

Engineering Contradiction:

Improveliquid preventionVSAvoidmotor cooling

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The air intake system is segmented into two separate pathways: a main intake path controlled by the float restrictor that prevents liquid ingestion, and a bypass path that allows additional cooling air to reach the motor. This segmentation resolves the contradiction by allowing the restrictor to seal the main path while the bypass path remains open for cooling purposes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A bypass vent acts as an intermediary element that provides an alternative route for cooling air to reach the motor impeller chamber. This bypass path is positioned and sized to allow sufficient cooling airflow while being separate from the liquid-prone main intake path, thus mediating between liquid prevention and motor cooling requirements.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the float is positioned to seal the air intake, then liquid ingestion is prevented, but airflow to the motor is blocked causing overheating

Engineering Contradiction:

Improveliquid ingestion preventionVSAvoidmotor operation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The air intake system is divided into a main sealed path and a bypass path. When the float seals the main air intake, the bypass path remains open to maintain motor cooling and operation, thus resolving the contradiction between preventing liquid ingestion and maintaining motor operation efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of completely blocking all air intake when the float seals, the system allows partial airflow through the bypass vent. This partial action provides sufficient cooling air to maintain motor operation efficiency while the main path is sealed for liquid prevention.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If a differential pressure diaphragm system is used, then liquid prevention is improved, but device complexity and cost increase

Engineering Contradiction:

Improveliquid preventionVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the complex differential pressure diaphragm system from the vacuum cleaner design. Instead, it uses a simpler float-based restrictor combined with a bypass vent arrangement to achieve liquid prevention, thereby reducing device complexity and cost while maintaining reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The float-based restrictor system uses simple, inexpensive components (float, restrictor opening, bypass vent) compared to the expensive differential pressure diaphragm system. These simple components are sufficient to achieve the liquid prevention function without requiring complex sensing and control mechanisms.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 bypass vent system effectively keeps the motor impeller chamber cool and prevents liquid from entering, allowing the vacuum to operate safely and efficiently without overheating, even when the float is in the raised position.

Implementation Method 1

a float configured to rise with a level of the liquid in the drum and prevent the liquid from entering the impeller intake

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Implementation Method 2

a bypass vent configured to allow sufficient air to reach the motor impeller chamber in order to keep the motor impeller chamber cool

Methodology Applied

Scientific EffectForced Convection: Forced Convection

Data Source

PatentUS10092148B2Vacuum bypass vent and vacuums incorporating such bypass vents

Publication Date: 2018.10.09 EMERSON ELECTRIC CO

AI summary

A vacuum appliance capable of picking up both wet and dry material is described, wherein the vacuum appliance includes an impeller configured to induce liquid into the vacuum appliance, a motor configured to turn the impeller, a restrictor assembly to prevent the liquid from being ingested into the motor, and a bypass vent assembly configured to allow sufficient air to reach the motor in order to keep the motor cool while the restrictor is preventing the liquid from being ingested into the motor. The vacuum appliance also includes a drum configured to retain the liquid and an impeller intake between the impeller and the drum. The restrictor may comprise a float configured to rise with a level of the liquid in the drum and prevent the liquid from entering the impeller intake. The bypass vent assembly may be configured to allow airflow to bypass the restrictor and/or the drum.