Page 187 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

Booster Pumps: These pumps are used to increase the pressure of water in a system. They are often used in
buildings or homes where the water pressure from the main supply is not sufficient.
Sump Pumps: Sump pumps are used to remove water that has accumulated in a sump pit, typically found in
basements. They are designed to pump water away from the building to prevent flooding.
Mechanical Water Pump: This type of water pump is driven by a belt connected to the engine’s crankshaft. It
circulates coolant through the engine and radiator to maintain optimal operating temperature.

In a mechanical water pump
Centrifugal Pump: This is the most common type of water pump used in automobiles. It uses a rotating impeller
to create a centrifugal force that pushes the coolant outward, increasing its pressure and flow rate.

Axial Flow Pump: This type of pump uses propeller-like blades to move coolant parallel to the pump shaft. It’s
often used in applications where a high flow rate is required.
Mixed Flow Pump: A mixed flow pump combo of the features of centrifugal and axial flow pumps. It uses a
combination of radial and axial flow to move coolant, providing a balance between flow rate and pressure.
Diaphragm Pump: This type of pump uses a diaphragm to create suction and push coolant through the system.
It’s often used in applications where a smooth and pulse-free flow is required.

Study about electric fan, thermostat, fan belts, temperature gauge, temperature sensor
Electric fan
The demand for flat fan systems in engine cooling often requires compact EEC motors. These smaller motors
need to be as efficient as larger ones but with reduced size and better heat dissipation. Achieving this is easier
with high-quality materials, but cost is a concern. Balancing cost and performance is important.

Improving heat transfer inside EEC motors can help lower critical temperatures, increasing reliability without
sacrificing power density. The study focuses on how motor temperature and airflow interact. It involves analyzing
heat sources, airflow, and heat transfer. Both numerical analysis and experiments are used to develop a reliable
method for analyzing EEC motors.
Thermostat
A thermostat valve is like a gatekeeper in a water cooling system for engines. It automatically regulates the flow
of water and air to keep the engine at the right temperature in various situations. When you start a cold engine,
the thermostat valve stays closed, stopping water from going to the radiator. Instead, it directs the water through
a bypass pipe back into the engine.
The thermostat valve helps the engine warm up quickly. Once the engine reaches its normal operating temperature,
the thermostat valve automatically opens, allowing water to flow from the engine to the radiator. This process
doesn’t involve the bypass pipe. Typically, the thermostat valve won’t let water cooler than 77°C pass through
it. There are two types of thermostat valves: bellow type and pellet type, which work on the same principle. The
bellow type has a heat unit shaped like a closed bellows filled with a liquid that vaporizes when heated, causing

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CITS : Automotive - Mechanic Diesel - Lesson 47 - 56