Structure and function of vacuum pump types
The structure and function of different types of vacuum pumps vary according to the types of use. Depending on the type of activity and the use of vacuum system, vacuum pump is selected.
To understand the content better, we will briefly introduce the types of vacuum pumps first.
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Circulating water vacuum pump
In this type of pump, water plays a major role in creating a stable vacuum.
The water vacuum pump has a cylinder chamber and an impeller that goes directly to the electro-motor and water always enters the inlet valve along with the air and exits the outlet valve. In these pumps, a pressure of 30 milibar can be reached, but to achieve lower pressures, oil vacuum pumps must be used.
Water pumps are divided into the following categories in terms of vacuum.
• 80 milibar vacuum: These are single-impeller water pumps. These pumps have a suction of 10 to 200,000 cubic meters.
• 30 milibar vacuum: These are dual-valve water pumps and have higher vacuum rate.
If we classify these pump models based on the type of coupling, we will reach the following category:
• End close
• Coupling magnet
• Couplings with straps and pulleys.
Lob vacuum pump
In this type of pump, bean-shaped blades move in opposite directions with high accuracy. The air is trapped in a compressed space and directed to the outside, where the oil acts as cooler. For more information about lobe vacuum pumps, read How Lobe Pumps Work.
Oil vane rotary vacuum pumps
These types of pumps are divided into tow categories. Single-stage and multi-stage vacuum pumps. The structure and function of oil vacuum pumps are generally the same and consist of a cylinder or suction chamber and a rotor and vacuum blades. In this type of pump, oil and air play the main role of cooling.
Liquid ring vacuum pump
In this type of vacuum pump, liquid acts as a sealant and is used for medium to high steam. These pumps create 30 torques vacuum. (Go to the unit conversion page to convert units). Oil or other low-pressure fluids are used to achieve greater vacuum. In these pumps, a fluid that is suitable for the type of pump is used. (This fluid may damage another type of pumps). These pumps are very reliable but also expensive in the pumps category.
Vane rotary vacuum pump with rotating blade
Used for pumping dry and clean neutral gas. The sealant in these pumps is oil. Since the oil is used as a sealant and lubricant for the pump, the suction rate of this pump is about 5 torques. (Go to the unit conversion page to convert units). These pumps are in the middle price range.
Rotary piston vacuum pump with rotating piston
These pumps are used for heavy and industrial applications. They have the ability of creating vacuum up to 50 torques. (Go to the unit conversion page to convert units). These pumps are suitable for use in cases of high pollution. They are also in high price range.
Structure and function of vacuum pump types
Dry vacuum pump
Unlike previous pumps, these pumps do not use liquid for sealing. Due to the lack of liquid sealant, these pumps cannot be used for corrosive substances. These pumps create up to 10 mm Hg vacuum(go to the unit conversion page to convert units).
Vacuum booster
The Booster-Roots Rotary Lob Vacuum Pump is a gas accelerator. In this way, the speed of the fluid sent to the vacuum pump is increased and so increases the vacuum of the device. (The article about different types of pumps completes this article.)
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Structure and function of vacuum pump types