Vacuum pumps are generally used to remove gas molecules from the two sealed regions. This machine was invented in 1650 by Otto von Guericke. The vacuum pumps can be categorized as per the three techniques and they are-
- Positive displacement pumps
- Momentum transfer pumps
- Entrapment pumps
Positive displacement types use a specific mechanism to expand a cavity, enable gases to flow in from the chamber, seal the cavity, and then exhaust it to the atmosphere. These are the most effective alternatives for the low vacuum operations.
Momentum transfer types use hi-speed rotating blades or high speed jets of dense fluid to push the gas molecules off the chamber.
Entrapment types trap the gases in adsorbed as well as solid state. These type of machines include ion pumps, cryopumps and getters.
For choosing a vacuum pump, it is necessary to consider certain aspects such as the flow of air removal, the amount of vacuum which needs to be produced and the power necessary to produce the vacuum. The manufacturers should inform the buyer about the flow-rate availability of the machines.
The next essential thing which needs to be considered is the power requirement of the machine. As a matter of fact, power requirements in the vacuum evacuators are much lower when compared to the air compressors. Large-sized machines facilitate continuous operation while the smaller ones boast high efficiency. The smaller machines tend to get overheated when put in operation for a continuous period.
Thirdly, it is essential to consider the specific type of vacuum pump. Here are few of the options -
Diaphragm pumps - These are durable and operate noiselessly. These are oil-less pumps with smaller footprint. The CFM range is one to three.
Piston pumps- These are as durable as the Diaphragm types but are not completely noiseless. They are also oil-less and function for a vacuum press. The CFM range is two to five.
Oil bath pumps- Oil bath types are low-pitched than the piston pumps but then, they are not as quiet as the diaphragm types. The oil bath pumps tend to emit oil into the air and this is one of the basic problems with these oil bath pumps. The oil in these pumps needs to be changed periodically. Its CFM range is three to six.
Rotary vane pumps- These kinds of vacuum pumps are oil-less. Easy to maintain, these pumps tend to get very hot while operating. The CFM range of these machines is from five to twenty.
Vacuum pumps are find application in a number of scientific and industrial processes which include:
- Moulding processes of plastics
- Electric lamps, CRTs, vacuum tubes production
- Uranium enrichment
- Medical applications (radiosurgery, radiotherapy and radiopharmacy)
- Robust coating/lining for engine components
- Ophthalmic coating
- Milking machines
- Air conditioning servicing
There is a varying range of Edwards Vacuum pumps available in the market, which is manufactured by different companies. As a potential buyer, you need to stay assured about the usage of each type as well as make it a point to buy the machines from reputed manufacturers.
Oliver Belli is a senior engineer in one of the Edwards Vacuum pump sales, servicing and maintenance centers in California. His company also deals with vacuum pump repairing and complete maintenance services.
Article Source: http://EzineArticles.com/?expert=Oliver_Belli
- Positive displacement pumps
- Momentum transfer pumps
- Entrapment pumps
Positive displacement types use a specific mechanism to expand a cavity, enable gases to flow in from the chamber, seal the cavity, and then exhaust it to the atmosphere. These are the most effective alternatives for the low vacuum operations.
Momentum transfer types use hi-speed rotating blades or high speed jets of dense fluid to push the gas molecules off the chamber.
Entrapment types trap the gases in adsorbed as well as solid state. These type of machines include ion pumps, cryopumps and getters.
For choosing a vacuum pump, it is necessary to consider certain aspects such as the flow of air removal, the amount of vacuum which needs to be produced and the power necessary to produce the vacuum. The manufacturers should inform the buyer about the flow-rate availability of the machines.
The next essential thing which needs to be considered is the power requirement of the machine. As a matter of fact, power requirements in the vacuum evacuators are much lower when compared to the air compressors. Large-sized machines facilitate continuous operation while the smaller ones boast high efficiency. The smaller machines tend to get overheated when put in operation for a continuous period.
Thirdly, it is essential to consider the specific type of vacuum pump. Here are few of the options -
Diaphragm pumps - These are durable and operate noiselessly. These are oil-less pumps with smaller footprint. The CFM range is one to three.
Piston pumps- These are as durable as the Diaphragm types but are not completely noiseless. They are also oil-less and function for a vacuum press. The CFM range is two to five.
Oil bath pumps- Oil bath types are low-pitched than the piston pumps but then, they are not as quiet as the diaphragm types. The oil bath pumps tend to emit oil into the air and this is one of the basic problems with these oil bath pumps. The oil in these pumps needs to be changed periodically. Its CFM range is three to six.
Rotary vane pumps- These kinds of vacuum pumps are oil-less. Easy to maintain, these pumps tend to get very hot while operating. The CFM range of these machines is from five to twenty.
Vacuum pumps are find application in a number of scientific and industrial processes which include:
- Moulding processes of plastics
- Electric lamps, CRTs, vacuum tubes production
- Uranium enrichment
- Medical applications (radiosurgery, radiotherapy and radiopharmacy)
- Robust coating/lining for engine components
- Ophthalmic coating
- Milking machines
- Air conditioning servicing
There is a varying range of Edwards Vacuum pumps available in the market, which is manufactured by different companies. As a potential buyer, you need to stay assured about the usage of each type as well as make it a point to buy the machines from reputed manufacturers.
Oliver Belli is a senior engineer in one of the Edwards Vacuum pump sales, servicing and maintenance centers in California. His company also deals with vacuum pump repairing and complete maintenance services.
Article Source: http://EzineArticles.com/?expert=Oliver_Belli
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