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Vacuum Pumps

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Robinair (15500) VacuMaster Economy Vacuum Pump - 2-Stage, 5 CFM , Red
  • Robinair's VacuMaster Economy Vacuum Pump is designed for air conditioning and...
  • 5 CFM free air displacement; factory rated to 35 microns
  • 1/3 HP, 115V/60 Hz thermally protected motor
  • Features an inlet fitting engineered for maximum airflow, while preventing oil...
  • 1/4 inch MFL & 3/8 inch ACME inlet fittings, 3/8 inch FFL x 1/2 inch Acme adapter,...

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Buyer's Guide: Vacuum Pumps

Vacuum Pumps and Their Environments

Vacuum pumps are devices that create a partial vacuum by drawing a gas stream from an enclosed container to the exterior of an area. The work of a vacuum pump consists of drawing gas into a confined area and then drawing a different gas back into the system. This is usually done by means of a rotary screw or a shaft. This type of pump also draws air into the ductwork or an external tank. This type of pump also has an impeller that can be turned by a variable speed motor.

Two-stage vacuum pumps are those that operate on the principle of variation in pressure. When these pumps are used, they provide higher pressure rates than conventional pumps. Two-stage pumps usually have a gear ratio between the rotor and the stator that causes the machine to work harder when the pressure variation occurs. The gear ratio is related to the amount of power needed to move the motor.

Vacuum pumps can be used for a variety of applications. For example, they are used in suction fans to push a stream of air into a room. Air is pumped into the room through an opening in the fan's casing. As the fan works, it draws in air molecules through the intake ports, moves them through the fan blade, and sucks the gas molecules through the discharge ports into the holding container.

There are three types of vacuum pumps. They include rotary vane, centrifugal-belted, and moveable cylinders. Rotary vane vacuum pumps are operated with the help of a rotor. Centrifugal-belted and moveable cylinder vacuum pumps are driven by the force of centrifugal force. In addition, the third type, the fig and displacement transfer pumps, operated by the kinetic energy of falling objects. All these vacuum pumps operate on the same principles; they draw in gas molecules through the intake ports and push the gas through the discharge ports, thus transferring the momentum.

There are four major components that constitute vacuum pumps. They are the rotor, case, tube, packing, and packing throat. The case and tube of a pump consisting of a hollow interior liner and outside shell, a wet cell or diaphragm is installed inside the case. This is designed to prevent the escape of gaseous and combustible gases, as well as to reduce the noise. The packing throat, a flexible rubber ring, is placed over the case and seals the air inside it.

Different types of vacuum pumps have different qualities. Some are more efficient in lower pressure ranges, and some work better at higher pressure levels. A proper calculation of the required pressures and vacuum levels is necessary for selecting the right pump for a particular application. Pumps need to be maintained properly by ensuring that they receive sufficient ventilation and that their intake port and discharge port are clean and free of debris.

While determining the appropriate vacuum pumps for a particular application, factors like power consumption, noise level, energy consumption, and efficiency must be considered. Some of the common components that are used in the construction of vacuum pumps are discussed below. Vacuum Pumps that are utilized for powering industrial machines and vehicles consume electricity. High-powered vacuum pumps have high energy consumption rates. The energy consumed by the pump may be as high as 400 watts per inch.

High-efficiency vacuum pumps with low or zero-loss technology are preferred for applications in medium to ultra-high vacuum ranges. High-speed vacuum pumps with high power output are useful for applications in medium to high vacuum ranges. Ultra-high vacuum pumps have very high power output, which can be necessary for applications where high pumping action is necessary.