Electric Water Pump Motor Casing Venting Design
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Solution Overview
Problem
Water leaking from the pump section of a water pump can enter the motor section, leading to potential failure due to air expansion and compression causing water deposition near the bearings, which can then enter the motor.
Innovation Solution
A water pump design featuring a motor casing with a vent hole that allows outside air to enter and relieve compressed air, combined with a waterproof sealing and weep hole between the pump and motor sections, and a hose connected to the vent hole to prevent water from entering the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a weep hole is provided on the motor section side to drain leaking water, then water can be drained from the pump section, but water may deposit near the bearing and enter the motor when air rapidly compresses due to temperature fluctuation
Solution Approach 1:
The motor casing is divided into a motor space and a vent space separated by a partition wall. The vent hole is positioned in the vent space at a higher location than the bearing, creating a spatial segmentation that prevents water from reaching the motor while allowing air pressure equalization.
Solution Approach 2:
The vent hole is positioned at a higher vertical dimension than the bearing location. This dimensional arrangement ensures that even when water deposits near the bearing, it cannot reach the vent hole opening, utilizing gravity and height difference to prevent water entry into the motor space.
2Reliability
If the motor casing is sealed to protect the motor, then motor protection is improved, but air expansion and compression cause water deposition near the bearing
Solution Approach 1:
The vent hole acts as an intermediary channel that allows air pressure equalization between the motor casing interior and exterior. This mediator function prevents rapid air compression that would otherwise force water into the motor, while the partition wall and elevated vent hole position ensure water cannot use this same pathway.
Solution Approach 2:
The harmful function of air compression is extracted and managed separately through the vent hole in the vent space, while the motor space remains protected. The partition wall separates the air management function from the motor protection function, allowing independent optimization of each.
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
Effectively prevents water from entering the motor section, enhancing the reliability of the water pump by ensuring that water leaks are vented out and do not accumulate in the motor space.
Implementation Method 1
when air expansion or compression occurs due to temperature fluctuation or the like caused by heat in the motor casing and the air in the motor casing is rapidly compressed
Implementation Method 2
outside air flows in through the vent hole and the air compression inside the motor is returned to an uncompressed state
Implementation Method 3
a waterproof sealing and a weep hole may be provided between the impeller blades of the pump section and the front bearing of the motor section
Implementation Method 4
A tip of the hose may be bent downward
Data Source
AI summary
A water pump has a pump section having radial impeller blades, a rotational shaft for rotating the radial impeller blades, and a motor section provided in the rear of the pump section and driving the rotational shaft. The motor section has a motor casing, a motor housed in the motor casing and rotating the rotational shaft, bearings provided on both sides of the motor interposed between them on the rotational shaft, interposed between an inner surface of the motor casing and the rotational shaft, and rotatably supporting the rotational shaft. In the motor casing, a vent hole for venting air between a motor space in which the motor is disposed in the motor casing and an outside of the motor casing is formed.