Disadvantages of Mechanical Engineering

Disadvantages of Mechanical Engineering
The workload is usually high and the atmosphere is competitive. Even Working environment is not so best. You find much Air conditioners like Software jobs. Also, despite recent increases in enrollment of women across all science and engineering disciplines, mechanical engineering still contains the lowest percentage of women. Since, it involves bit hard work.

Advantages are more than Disadvantages. so, dont afraid of Mechanical engineering.

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Mechanical Core Jobs

Mechanical Core Jobs

As a Mechanical Engineer we all like to join in a Mechanical Core Job. Mechanical engineering is finding more and more applications these days in other areas of engineering also.

Now we are having great opportunities in CAD/CAM industry. It is the future of Mechanical engineering.

Simplex and Duplex Pump

Simplex and Duplex Pump

A simplex pump, sometimes referred to as a single pump, is a pump having a single liquid (pump) cylinder. A duplex pump is the equivalent of two simplex pumps placed side by side on the same foundation.The driving of the pistons of a duplex pump is arranged in such a manner that when one piston is on its upstroke the other piston is on its downstroke, and vice versa. This arrangement doubles the capacity of the duplex pump compared to a simplex pump of comparable design.

Direct-Acting and Indirect-Acting Pumps

Direct-Acting and Indirect-Acting Pumps

Some reciprocating pumps are powered by prime movers that also have reciprocatingmotion, such as a reciprocating pump powered by a reciprocating steam piston. The piston rod of the steam piston may be directly connected to the liquid piston of the pump or it may be indirectly connected with a beam or linkage. Direct-acting pumps have a plunger on the liquid (pump) end that is directly driven by the pump rod (also the piston rod or extension thereof) and carries the piston of the power end. Indirect-acting pumps are driven by means of a beam or linkage connected to and actuated by the power piston rod of a separate reciprocating engine.

Reciprocating Pumps types

Reciprocating positive displacement pumps are generally categorized in four ways:
Direct-acting or indirect-acting
Simplex or duple
Single-acting or double-acting
Power pump

Principle of Operation of Positive Displacement Pump

This is the operation of simple Positive Displacement Pump is given below.

Principle of Operation of Positive Displacement Pump

All positive displacement pumps operate on the same basic principle. This principle can be most easily demonstrated by considering a reciprocating positive displacement pump consisting of a single reciprocating piston in a cylinder with a single suction port and a single discharge port as shown in Figure. Check valves in the suction and discharge ports allow flow in only one direction.
During the suction stroke, the piston moves to the left, causing the check valve in the suction line between the reservoir and the pump cylinder to open and admit water from the reservoir.During the discharge stroke, the piston moves to the right, seating the check valve in the suction line and opening the check valve in the discharge line. The volume of liquid moved by the pump in one cycle (one suction stroke and one discharge stroke) is equal to the change in the liquid volume of the cylinder as the piston moves from its farthest left position to its farthest right position.

Definition of Positive displacement pump

Pumps are the basic requirement in our day to day life. These are having so much of importance. Pumps field is so good. for every mechanical engineer should have a good idea in Pumps. All the fundamentals of pumps are given below.........

Introduction
A positive displacement pump is one in which a definite volume of liquid is delivered for each cycle of pump operation. This volume is constant regardless of the resistance to flow offered by the system the pump is in, provided the capacity of the power unit driving the pump or pump component strength limits are not exceeded. The positive displacement pump delivers liquid in separate volumes with no delivery in between, although a pump having several chambers may have an overlapping delivery among individual chambers, which minimizes this effect. The positive displacement pump differs from centrifugal pumps, which deliver a continuous flow for any given pump speed and discharge resistance.
Positive displacement pumps can be grouped into three basic categories based on their design and operation.
The three groups are
1. Reciprocating pumps
2. Rotary pumps
3. Diaphragm pumps