What is the introduction of pneumatics?

Pneumatics refers to the science of using compressed air to transmit energy and force. A basic example of utilizing pressurized air for the desired function is something as simple as blowing air into a balloon and then letting it zoom around the room. Pneumatic tools are essential components behind things such as drilling machines, machinery that transports heavy objects, and even jet engines!

In this blog, we’ll go over the brief history of pneumatic systems and how they evolved to their current state.

The Origins

The word pneumatics may sound modern and complex, but the technology has been used by humans for thousands of years. In fact, it began when primitive hunters first created blow-guns to hunt down their prey. These contraptions delivered pressure of around 1 to 3 psi. It wasn’t until 3000 B.C that small compressors were developed to assist in starting fires.

Around 10 to 70 A.D, a Greek mathematician simply known as the Hero of Alexandria created what would be the first pneumatic tools. Despite their rudimentary design, these tools would lay the foundation upon which future pneumatic systems would be developed. Fast forward to the 1600s, a German physicist known as Otto von Guericke would invent the first vacuum pump that made use of pressurized air.

1800s – The Era of Revolutions

The 1800s would later be known as the era in which pneumatic evolved into its own industry with businesses and inventors alike recognizing its great potential. No longer did people tinker around with pneumatic systems out of curiosity but rather to produce tools that served a practical purpose.

Innovation began with the introduction of pneumatic tubes in Victorian England that used pipelines to transport telegrams from one station to another. During the late 1800s, an American merchant known as John Wanamaker developed tube systems that helped transport money and mail items.

The most elaborate use of these tubes was introduced in 1867 by a man called Alfred Beach. He created a subway line that transported passengers through a pipe. Unfortunately, his project was not granted commercial access and closed down after a while.

The year 1890 saw the invention of the pneumatic hammer by Charles Brady King. This tool became vital for fastening steel structures in railway sleepers and shipyards.

Pneumatics Today

Modern-day pneumatic tools provide an accurate and quick pressure supply for a number of applications including packaging, automation control, and heavy load movement.

Pneumatic systems continue to evolve to provide better-pressurized solutions. Hovair Systems Inc. provides businesses across multiple industries with pneumatic tools that assist in heavy load handling and movement. These tools require minimal training to operate and assist in reducing energy costs. Contact us today for more information.

Branch of engineering

"Pneumatic" redirects here. For the highest order of humans in Gnosticism, see Pneumatic (Gnosticism)

Pneumatics (from Greek πνεῦμα pneuma 'wind, breath') is a branch of engineering that makes use of gas or pressurized air.

Pneumatic systems used in industry are commonly powered by compressed air or compressed inert gases. A centrally located and electrically-powered compressor powers cylinders, air motors, pneumatic actuators, and other pneumatic devices. A pneumatic system controlled through manual or automatic solenoid valves is selected when it provides a lower cost, more flexible, or safer alternative to electric motors, and hydraulic actuators.

Pneumatics also has applications in dentistry, construction, mining, and other areas.

Gases used in pneumatic systems

[

edit

]

Pneumatic systems in fixed installations, such as factories, use compressed air because a sustainable supply can be made by compressing atmospheric air. The air usually has moisture removed, and a small quantity of oil is added at the compressor to prevent corrosion and lubricate mechanical components.

Factory-plumbed pneumatic-power users need not worry about poisonous leakage, as the gas is usually just air. Any compressed gas other than air is an asphyxiation hazard—including nitrogen, which makes up 78% of air. Compressed oxygen (approx. 21% of air) would not asphyxiate, but is not used in pneumatically-powered devices because it is a fire hazard, more expensive, and offers no performance advantage over air. Smaller or stand-alone systems can use other compressed gases that present an asphyxiation hazard, such as nitrogen—often referred to as OFN (oxygen-free nitrogen) when supplied in cylinders.

Portable pneumatic tools and small vehicles, such as Robot Wars machines and other hobbyist applications are often powered by compressed carbon dioxide, because containers designed to hold it such as soda stream canisters and fire extinguishers are readily available, and the phase change between liquid and gas makes it possible to obtain a larger volume of compressed gas from a lighter container than compressed air requires. Carbon dioxide is an asphyxiant and can be a freezing hazard if vented improperly.

History

[

edit

]

Although the early history of pneumatics is murky, the field's founder is traditionally traced back to Ctesibius of Alexandria "who worked in the early 3rd century BCE and invented a number of mechanical toys operated by air, water, and steam under pressure." Though no documents written by Ctesibius survive, he is thought to have heavily influenced Philo of Byzantium while writing his work, Mechanical Syntaxis, as well as Vitruvius in De architectura.[1] In the first century BC, the ancient Greek mathematician Hero of Alexandria compiled recipes for dozens of contraptions in his work, Pneumatics. It has been speculated that much of this work can be attributed to Ctesibius.[2] The pneumatic experiments described in these ancient documents later inspired the Renaissance inventors of the thermoscope and the air thermometer, devices which relied upon the heating and cooling of air to move a column of water up and down a tube.[3]: 4–5 

German physicist Otto von Guericke (1602-1686) invented the vacuum pump, a device that can draw out air or gas from the attached vessel. He demonstrated the vacuum pump to separate the pairs of copper hemispheres using air pressures. The field of pneumatics has changed considerably over the years. It has moved from small handheld devices to large machines with multiple parts that serve different functions.

Comparison to hydraulics

[

edit

]

Both pneumatics and hydraulics are applications of fluid power. Pneumatics uses an easily compressible gas such as air or a suitable pure gas—while hydraulics uses relatively incompressible liquid media such as oil. Most industrial pneumatic applications use pressures of about 80 to 100 pounds per square inch (550 to 690 kPa). Hydraulics applications commonly use from 1,000 to 5,000 psi (6.9 to 34.5 MPa), but specialized applications may exceed 10,000 psi (69 MPa).[citation needed]

Advantages of pneumatics

[

edit

]

• Simplicity of design and control—Machines are easily designed using standard cylinders and other components, and operate via simple on-off control.
• Reliability—Pneumatic systems generally have long operating lives and require little maintenance. Because gas is compressible, equipment is less subject to shock damage. Gas absorbs excessive force, whereas fluid in hydraulics directly transfers force. Compressed gas can be stored, so machines still run for a while if electrical power is lost.
• Safety—There is a very low chance of fire compared to hydraulic oil. New machines are usually overload safe to a certain limit.

Advantages of hydraulics

[

edit

]

• Fluid does not absorb any of the supplied energy.
• Capable of moving much higher loads and providing much lower forces due to the incompressibility.
• The hydraulic working fluid is practically incompressible, leading to a minimum of spring action. When hydraulic fluid flow is stopped, the slightest motion of the load releases the pressure on the load; there is no need to "bleed off" pressurized air to release the pressure on the load.
• Highly responsive compared to pneumatics.
• Supply more power than pneumatics.
• Can also do many purposes at one time: lubrication, cooling and power transmission.

Pneumatic logic

[

edit

]

Pneumatic logic systems (sometimes called air logic control) are sometimes used for controlling industrial processes, consisting of primary logic units like:

• And units
• Or units
• Relay or booster units
• Latching units
• Timer units
• Fluidics amplifiers with no moving parts other than the air itself

Pneumatic logic is a reliable and functional control method for industrial processes. In recent years, these systems have largely been replaced by electronic control systems in new installations because of the smaller size, lower cost, greater precision, and more powerful features of digital controls. Pneumatic devices are still used where upgrade cost, or safety factors dominate.[4]

Examples of pneumatic systems and components

[

edit

]

See also

[

edit

]

Notes

[

edit

]

References

[

edit

]

• Brian S. Elliott, Compressed Air Operations Manual, McGraw Hill Book Company, 2006, ISBN 0-07-147526-5.
• Heeresh Mistry, Fundamentals of Pneumatic Engineering, Create Space e-Publication, 2013, ISBN 1-49-372758-3.