Category: vacuum pump

• Rotary vane: A rotary vane industrial vacuum pump works by positive displacement, which entails the forcing of a fixed amount of fluid from the pump’s inlet pressure section to its discharge, a process that is similar to that of a syringe. Rotary vane pumps are comprised of a series of vanes that are mounted to a rotor that turns inside a cavity. As the vanes rotate, centrifugal force extends them from their individual slots, forming compression cells. Learn more about finding the right parts for your rotary vane vacuum pump

• Articulated piston: An articulated piston industrial vacuum pump operates in a manner similar to that of an automobile engine. As the piston moves downward inside the cylinder, air is drawn in through the intake valve. During the piston’s upward stroke, the air is permitted to escape via an exhaust valve. Two spring-backed piston rings are used to seal the piston to the cylinder.

• Screw: Rotary screw pumps include two parallel rotary screws in the pump housing. The screws are synchronized to turn in opposite directions, which causes the compression action to occur. The gas is compressed in the direction of the pump’s discharge port. Pump cooling occurs via a water-cooled outer chamber. A major advantage of screw industrial vacuum pumps is that they require no lubrication in the pumping chamber, which eliminates contamination and pollution.

• Liquid ring: Liquid ring pumps also operate via positive displacement. During operation, the pump’s impeller rotates inside the pump casing. A rotating liquid ring then seals the impeller and its blades. Liquid is sucked into the compression chamber to keep the ring stable. Conveyed gas is compressed during each impeller revolution.

• Claw: Claw vacuum pumps consist of two rotors that do not come in contact with one another during rotation. As the rotors turn, gas moves from the suction side to the pressure side, where the difference in pressure between the two sides causes the gas to be compressed. Cooling air is drawn into the compression housing to reduce the temperature before it exits the pump.

A rotary vane vacuum pump system consists of a series of parts and components, some of which may break, fail to perform or even wear out over time. Timely air compressor pump parts replacement can ensure your unit operates at maximum efficiency and continues to provide reliable service. The following information can serve as a guide to help you spot signs of trouble that could indicate that it is time for a pump air compressor parts replacement.Low Level of Performance

A rotary vane vacuum pump can underperform for a number of reasons. One common culprit is that the vanes are worn and need to be replaced. Vane replacement should occur when the vane’s length is reduced by one-fourth of an inch or more. The system’s check valve could also be defective — a stuck valve that remains partially closed will impede air flow

and reduce pump performance. Replacing clogged exhaust filters can eliminate excessive contamination that hinders air compressor pump performance.

Oil Blow-by Issues

The occurrence of oil blow-by could simply mean that the discharge exhaust filter is loose or not seated properly. This can be remedied by properly seating or replacing the gasket. If this doesn’t correct the problem, a full replacement of the exhaust filter could be in order.

Excessive Heat Generation

Most rotary vane vacuum pumps are air-cooled. If the ambient temperature in the room where the pump is operating is excessive or if the unit is located near other hot-running machinery, the pump can run hot as well. Make sure your pump is not in the path of heat exhaust emitted by other equipment. You can also consider switching your pump’s lubricant to synthetic oil, assuming this is permitted by the manufacturer.

Frequent Starting and Stopping

If your pump starts and stops too frequently, the vacuum switch might need to be replaced. A worn vacuum switch may result in start or stop signals being sent to the motor at irregular intervals. If you have a multiplex vacuum pump system, an excessive starting and stopping could be caused by a defective check valve. If you operate a larger vacuum pump system, consider installing a minimum run timer to ensure the pump operates for a specified period of time before shutting down.

Loud Noises

If you notice that your pump is making strange or unusually loud noises, the vanes may be worn and should be replaced. Contaminated fluid can wash-board the pump’s cylinder, which will make the vanes come out of the rotor slots at an angle. In addition to excessive noise, this can cause significant damage to the vanes, as well as the cylinder.

Rotary vane vacuum pumps are ideally suited for a wide range of low and medium vacuum applications such as general and chemical laboratory, analytics, freeze drying, process engineering and more. A rotary vane pump works via positive displacement, which is when volumes of air or gas are confined within a closed space and are compressed when the space is mechanically reduced.

Rotary Vane Vacuum Pump Components

A typical rotary vacuum pump is comprised of a housing, a rotor and a series of radially moving vanes, which come in dry-running or lubricated versions (the latter are the most commonly used in the majority of industrial applications). The rotor is generally the only continuously moving vane vacuum pump part. There’s also a working chamber inside the housing, which is divided into two separate compartments by the rotor and vanes. Many vane vacuum pumps also include an inlet valve as a safety feature.

Rotary vane vacuum pumps are available in single-stage and two-stage versions. The stages refer to the number of times that compression actually occurs. Two-stage pumps are also able to attain a lower pressure than single-stage pumps, due to the fact that gas is only admitted during the high pressure stage.

Rotary Vacuum Pump Operating Principle

Here’s a brief overview of how a rotary vane vacuum pump works: As the pump’s rotors turn, it results in the creation of centrifugal force and the related development of compression cells. Gas is forced to flow into the suction chamber, where it is then sealed by a vane. The gas is compressed until atmospheric pressures force the outlet valve to open. With an oil-lubricated vane vacuum pump, the opening of the outlet valve enables oil to enter the suction chamber to lubricate the vanes and also seal them against the housing.

Rotary Vane Vacuum Pump Benefits

Most rotary vane vacuum pumps are able to handle thin liquids at relative high pressure. The extension of the vanes during operation helps to compensate for wear. An oil-lubricated rotary vacuum pump can also run dry for short periods of time, which can reduce overall oil consumption and cost. Dry-running pumps in particular are extremely cost-effective to own and operate and are known for being very eco-friendly.

Vane Vacuum Pump Maintenance

A rotary vane vacuum pump is relatively easy to maintain. The vanes will tend to wear down over time — they should be replaced when their length becomes one fourth of an inch shorter than when brand-new. You should also replace the bearings if you notice any play in them. If a new bearing does not fit tightly against the shaft, which is a fairly common issue with vane pump bearing replacement, the shaft likely needs to be welded and machined. Worn seals should be repaired as quickly as possible, as this is the leading cause of vane vacuum pump failure.

Rotary Vane Vacuum Pump Parts

QSV

The QSV focuses on delivering the exact performance you demand, at the minimum possible life cycle cost. Ideal for applications where you need to maintain a set vacuum level (a set point).

QCV

The new range based on Quincy Compressor’s QCV – Dry Claw technology features an innovative design which creates a new benchmark in the claw pump market. The simplicity, robustness, efficiency and contaminant handling capability of these pumps make them the smart choice for your application. Built to the exacting standards and quality demanded by out customers, the new dry claw pump provides you with a trouble-free and cost-effective solution to meet your needs.

QLR

Liquid ring vacuum has always been and will always be one of the best technologies for extreme vapor loads. Quincy liquid ring pumps are ideal for pumping wet or dry gasses with a high tolerance for liquid carryover, especially on condensable processes such as distillation, drying and evaporator duties. Available in material options to suit demanding processes, and available in either single or dual stage design – we have a solution for all applications

QV

The QV series consists of 13 high-performing vacuum pump compressor models that can produce enough volumetric capacity for even the most challenging applications. These stand-alone systems are also portable, enabling you to easily move them around your facility or jobsite as needed. You can choose a 2 hp vacuum pump or one that can produce up to 40 hp. Key QV features include a multistage separation system, powerful and dependable direct-drive NEMA motor — an optional TEFC motor is also available — and integral inlet check valve.

QVMS

The QVMS is an air-cooled direct-drive vacuum air compressor pump with a 2-10 hp and 8-378 scfm capacity. Specifically designed and engineered for medical vacuum use, the QVMS can meet the requirements of high-demand hospital applications. The QVMS is also easy to install and compact enough to fit through a standard doorway. The one-side access simplifies the preventive maintenance process. The Quincy QV vacuum pump serves as the driving force behind the QVMS. Other features include a multistage demister/separator, gas ballast, anti-suck valves and a robust TEFC motor. The Quincy QVMS is fully NFPA 99 compliant.