Cleaning Fluid Heating and Mixing for Carpet Extractors
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Solution Overview
Problem
Conventional carpet extractors lack efficient mechanisms for heating cleaning fluids and controlling the proportion of different cleaning agents delivered to the surface, which can impact cleaning effectiveness and versatility.
Innovation Solution
A surface cleaning apparatus with a housing containing a fluid delivery system that includes a motor for heating the cleaning fluid, a mixing manifold for controlling the proportion of different fluids, and a fluid recovery system, utilizing a shape memory alloy actuator for valve operation to manage fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a motor is used to heat cleaning fluid in conventional extractors, then cleaning fluid heating is achieved, but the heating efficiency and temperature control are insufficient
Solution Approach 1:
The patent combines the motor cooling function with the cleaning fluid heating function by routing motor cooling air through a heat exchange path that contacts the cleaning fluid supply line. This merging of functions allows the motor's waste heat to be utilized for heating the cleaning fluid, improving heating efficiency while reducing energy consumption.
Solution Approach 2:
The patent converts the waste heat generated by the motor (which would otherwise be discarded) into a useful resource for heating the cleaning fluid. By capturing and redirecting the motor cooling air through the cleaning fluid supply, the system transforms thermal waste into beneficial heat energy, improving overall system efficiency.
2Adaptability or versatility
If multiple cleaning fluid tanks are used to provide different cleaning agents, then cleaning versatility is improved, but controlling the proportion of different fluids becomes complex
Solution Approach 1:
The patent employs automatic proportioning mechanisms that self-regulate the mixing ratios of different cleaning fluids based on pre-programmed parameters. The system automatically controls valve actuation and fluid flow rates without requiring manual intervention, thereby simplifying operation while maintaining versatility in cleaning agent composition.
Solution Approach 2:
The system incorporates feedback control mechanisms that monitor fluid flow rates and automatically adjust valve positions to maintain precise mixing proportions. This closed-loop control ensures consistent fluid ratios despite variations in tank levels or flow conditions, simplifying the complexity of multi-fluid proportioning.
3Measurement precision
If shape memory alloy actuators are used for valve operation, then precise fluid flow control is achieved, but the actuator response time and temperature dependence become constraints
Solution Approach 1:
The patent utilizes the temperature-dependent properties of shape memory alloy actuators to control valve operation. By changing the thermal parameters (heating or cooling the SMA material), the system achieves precise fluid flow proportioning. The temperature changes trigger phase transitions in the SMA, which mechanically actuate the valves with high precision.
Solution Approach 2:
The system pre-heats or pre-cools the shape memory alloy actuators to optimal temperatures before requiring valve actuation. This preliminary thermal conditioning reduces the response time by ensuring the SMA material is already near its transformation temperature, minimizing the delay when fluid proportioning changes are required.
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 apparatus efficiently heats cleaning fluids and allows precise control of cleaning agent proportions, enhancing cleaning performance and versatility across various cleaning modes.
Implementation Method 1
a passageway in the housing for passing cooling air over the motor and configured to pass the heated cooling air in heat exchange with the fluid supply chamber to heat the supply of cleaning fluid in the fluid supply chamber
Implementation Method 2
The valve mechanism includes a valve body, a valve member movable relative to the valve seat to control the flow of fluid between the inlet and the outlet, and an actuator that includes a shape memory alloy part coupled to the valve member
Data Source
AI summary
A surface cleaning apparatus comprises a fluid delivery system including a supply of cleaning fluid and a fluid recovery system for drawing dirty cleaning fluid from the surface to be cleaned. The apparatus can comprise a passageway that passes heated motor cooling air in heat exchange with the cleaning fluid to heat the cleaning fluid. The apparatus can further comprise a mixing manifold that mixes first and second cleaning fluids at different concentrations for different cleaning modes. The apparatus can further comprise a fluid valve having a shape memory alloy actuator.