Water pump

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Revision as of 21:37, 24 September 2012

Executive Summary

Primary Stakeholders and Product Needs

The major stakeholders are the customer and the shipper. In the typical American urban household, the main use of this type of pump is to pump water out of basements or to water grass. To meet these needs the product has to be able to pump water from a lower source, the basement, to a higher final place, such as through a window and outside into the grass. It has to be durable and simple to use which means that anyone can use it. The shipper needs the product to be as light and small as possible to cut down on weight, which cuts fuel costs. Also smaller products mean that more can fit in the same space and also reduce shipping costs. These two groups are the main stakeholders of the post production section.

Product Use

How the Product Functions Mechanically

First plug in the motor with the appropriate voltage selected. The electricity runs through the pressure sensor and then to the motor. The motor turns an internal shaft which is connected to a buffer spring. The spring is connected to the impeller which is connected to an nozzle that goes to the inlet. So the motor shaft, spring, impeller, and nozzle are all connected into one shaft driven by the motor.

When the motor turns it creates a suction which draws the water through the inlet and nozzle to the impeller. The spinning impeller then throws the water out into the iron chamber causing a vortex to develop. This vortex then causes the pressure to increase inside the iron chamber and forces the water through the outlet. It is the pressure created from the spinning water that is actually pumping the water.

The pressure sensor is connected to the iron chamber and when the pressure reaches a certain threshold, it causes a mechanical switch to cut the power to the motor. The pressure sensor threshold can be adjusted by setting a spring to a predetermined compression. Then when the pressure increases it compresses the spring more, which will cause the circuit to break through various mechanical linkages.

Bill of Materials

Design for Manufacture and Assembly (DFMA)

Failure Mode and Effects Analysis (FMEA)

Design For Environment (DFE)

Team

References

List of 600+ Mechanisms of Pump Failure. http://www.lifetime-reliability.com/free-articles/reliability-improvement/pump-failure-modes-list.html

How to Adjust Water Pump Pressure Control Switch. http://inspectapedia.com/water/WaterPumpAdjust.htm

Mechanical Shaft Seals for Pumps: http://net.grundfos.com/doc/webnet/waterutility/_assets/downloads/shaft_seals.pdf

Electric Motor Failure Modes. http://blog.machineryhealthcare.com/bid/47114/Electric-motor-failure-modes

How our pump works: fill it with water, plug it in, motor spins, turns impeller, creates pressure differential, pumps water. Use cases: - Mechanical/how it works - Jenny - Household use in America - Christina - Centrifugal pumps - Kyra - Piston/suction pumps - Eva - Torque info - Jerry