FINDING TUTOR WITH ENGINEERING BACKGROUND

2018-2019 Fluid Power Handbook & Directory 83

Evacuating air from a closed vol-ume develops a pressure differ-ential between the volume and the surrounding atmosphere. If this closed volume is bound by the sur- face of a vacuum cup and a workpiece, atmospheric pressure will press the two objects together. The amount of holding force depends on the surface area shared by the two objects and the vacuum level. In an industrial vacuum system, a vacuum pump or generator removes air from a system to create a pressure differential.

Because it is virtually impossible to remove all the air molecules from a container, a perfect vacuum cannot be achieved. Of course, as more air

is removed, the pressure differential increases, and the potential vacuum force becomes greater.

The vacuum level is determined by the pressure differential between the evacuated volume and the sur- rounding atmosphere. Several units of measure can be used. Most refer to the height of a column of mercury— usually inches of mercury (in.-Hg) or millimeters of mercury (mm-Hg). The common metric unit for vacuum measurement is the millibar, or mbar. Other pressure units sometimes used to express vacuum include the inter- related units of atmospheres, torr, and microns. One standard atmosphere equals 14.7 psi (29.92 in.-Hg). Any fraction of an atmosphere is a partial vacuum and equates with negative

gauge pressure. A torr is defined as 1/760 of an atmosphere and can also be thought of as 1 mm-Hg, where 760 mm-Hg equals 29.92 in.-Hg. Even smaller is the micron, defined as 0.001 torr. However, these units are used most often when dealing with near- perfect vacuums, usually under labo- ratory conditions, and seldom in fluid power applications.

Atmospheric pressure is measured with a barometer. A barometer con- sists of an evacuated vertical tube with its top end closed and its bottom end resting in a container of mercury that is open to the atmosphere, Fig. 1. The pressure exerted by the atmosphere acts on the exposed surface of the liquid to force mercury up into the tube. Sea level atmospheric pressure

will support a mercury column generally not more than 29.92- in. high. Thus, the standard for atmospheric pressure at sea level is 29.92 in.-Hg, which translates to an absolute pres- sure of 14.69 psia.

T h e t w o b a s i c re f e re n c e points in all these measure- m e nt s a r e s t a n d a r d at m o - spheric pressure and a perfect v a c u u m . A t a t m o s p h e r i c pressure, the value 0 in.-Hg is equivalent to 14.7 psia. At the opposite reference point, 0 psia—a perfect vacuum (if it could be attained)—would have a value equal to the other extreme of its range, 29.92 in.- Hg. However, calculating work forces or changes in volume in vacuum systems requires con-

As compressed air does, vacuum puts the

atmosphere to work. But unlike compressed air,

vacuum uses the surrounding atmosphere to create

the work force.

Vacuum Technology

1. Atmospheric pressure force determines

height of mercury column in simple barometer.

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VACUUM TECHNOLOGY

the mercury level in each leg is the same. Applying a vacuum to one leg causes the mercury to rise in that leg and to fall in the other. The difference in height between the two levels indi- cates the vacuum level. Manometers can measure vacuum directly to 29.25 in.-Hg.

An absolute pressure gauge shows the pressure above a theoretical per- fect vacuum. It has the same U-shape as the manometer, but one leg of the absolute pressure gauge is sealed, Fig. 3. Mercury fills this sealed leg when the gauge is at rest. Applying vacuum to the unsealed leg lowers the mercury level in the sealed leg. The vacuum

level is measured with a sliding scale placed with its zero point at the mer- cury level in the unsealed leg. Thus, this gauge compensates for changes in atmospheric pressure.

INDUSTRIAL VACUUM SYSTEMS

Vacuums fall into three ranges: • rough (or coarse), up to 28 in.-Hg • middle (or fine), up to one micron, • high, greater than one micron.

Almost all industrial vacuum sys- tems are rough. In fact, most lifting and work-holding applications oper- ate at vacuum levels of only 12 to 18- in. Hg. This is because it generally is more economical to increase the lift- ing or holding force by increasing the contact area between the workpiece and vacuum cup than it is to pull a higher vacuum and use the same con- tact area.

Middle vacuum is used for process applications such as molecular distil- lation, freeze drying, degassing, and coating operations. High vacuums are used in laboratory instruments, such as electron microscopes, mass spec- trometers, and particle accelerators.

A typical vacuum system consists of a vacuum source, deliver y lines, fittings, and various control valves, switches, filters, and protective de- vices. Leakage prevention is especially important with vacuum systems be- cause even very small leaks can greatly diminish performance and efficiency. If plastic tubing is used—as is often the case—be sure it is designed for vacuum service. Otherwise, the walls of the tubing could collapse under a vacuum and block flow. Also, vacuum lines should be as short and narrow as is practical to limit the volume of air that must be evacuated.

An important design consideration for work-holding applications is to use the vacuum pump only to achieve the vacuum level required. Once the workpiece is in contact with the vac- uum cup and the required vacuum achieved, de-energizing a normally closed valve will hold the vacuum in- definitely—provided no leakage oc-

versions to negative gauge pressure (psig) or absolute pressure (psia).

Atmospheric pressure is assigned the value of zero on the dials of most pressure gauges. Vacuum measure- ments must, therefore, be less than zero. Negative gage pressure generally is defined as the difference between a given system vacuum and atmo- spheric pressure.

VACUUM MEASUREMENT

Several types of gauges measure vacuum level. A Bourdon tube-type gauge is compact and the most widely used device for monitoring vacuum system operation and performance. Measurement is based on the deforma- tion of a curved elastic Bourdon tube when vacuum is applied to the gauge’s port. With the proper linkage, com- pound Bourdon tube gauges indicate both vacuum and positive pressure.

An electronic counterpart to the vac- uum gauge is the transducer. Vacuum or pressure deflects an elastic metal diaphragm. This deflection varies elec- trical characteristics of interconnected circuitry to produce an electronic sig- nal that represents the vacuum level.

A U-tube manometer, Fig. 2, indi- cates the difference between two pres- sures. In its simplest form, a manom- eter is a transparent U-tube half-filled with mercury. With both ends of the tube exposed to atmospheric pressure,

2. U-tube manometer, fi lled with mercury, measures vacuum as a difference

between vacuum source and atmospheric pressure.

3. Absolute pressure gauge measures

vacuum as the difference in mercury

level in its two legs

2018-2019 Fluid Power Handbook & Directory 85

vide very high flow rates, but cannot achieve high vacuum. Major non-pos- itive-displacement pumps are multi- stage centrifugal, axial flow units, and regenerative (or peripheral) blowers. Of these, only the blower is an eco- nomical choice for stand-alone or dedicated vacuum systems.

Temperature considerations are very important when selecting a me- chanical vacuum pump because high external or internal heat can greatly affect pump performance and service life. Internal pump temperature is important because as vacuum level increases, less air is present to carry away the heat generated, so the pump must absorb more of the heat. Heavy- duty pumps with cooling systems are often required for high vacuum appli- cations. But light-duty pumps can op- erate at maximum vacuum for short periods of time if there is an adequate cool-off period between cycles. The pump experiences a total temperature rise as a result of all the heat sources acting on it - internally generated heat plus heat from internal leakage, com- pression, friction, and external ambi- ent temperature.

VENTURI-TYPE VACUUM PUMPS

Many machines that require vac- uum also use compressed air. And if vacuum is required only intermit- tently, the compressed air that already is available can be used to gener- ate vacuum through a device called a vacuum generator, also known as a vacuum ejector or vacuum pump.

MECHANICAL VACUUM PUMPS

A conventional vacuum pump may be thought of as a compressor that operates with its intake below atmo- spheric pressure and the discharge at atmospheric pressure. Compressors and vacuum pumps have identical pumping mechanisms. The vacuum pump is simply piped to withdraw air from a closed container and exhaust to atmosphere, which is just the opposite of what a compressor does. Although the machines have many similarities, two significant differences between compression and vacuum pumping actions must be considered in system design. The maximum change in pres- sure produced by a vacuum pump is limited; it can never be higher than at- mospheric pressure. Plus, as vacuum increases, the volume of air passing through the pump drops continu- ously. Therefore, the pump itself must absorb virtually all heat generated.

Mechanical vacuum pumps gen- erally are categorized as either posi- tive displacement or non-positive displacement (dynamic). Positive- displacement pumps draw a rela- tively constant volume of air despite any variation in the vacuum level and can pull a relatively high vacuum. The principle types of positive-displace- ment pumps include: reciprocating and rocking piston, rotary vane, dia- phragm, lobed rotor, and rotary screw designs.

Non-positive-displacement pumps use kinetic energy changes to move air out of a closed system. They pro-

curs. Holding a vacuum in this man- ner consumes no energy and avoids having to operate the vacuum pump continuously.

Companies also offer proprietary devices, such as vacuum cups with in- tegral valves and valves that terminate flow from a cup that exhibits exces- sive leakage. This valve is designed to avoid false alarm shutoff when holding porous workpieces (such as cardboard), yet prevent a leak at one vacuum cup from reducing vacuum at an adjacent cup.

VACUUM PUMP SELECTION

The first major step in selecting the right vacuum pump is to compare ap- plication vacuum requirements with the maximum vacuum ratings of com- mercial pumps. At low levels, there is a wide choice of pumps. But as vacuum level increases, the choice narrows, sometimes to the point where only one type of pump may be available.

To calculate a system’s vacuum needs, consider all work devices to be driven. The working vacuum of the devices can be determined by calcula- tions based on handbook formulas, theoretical data, catalog information, performance cur ves, or tests made with prototype systems. Once you know the vacuum required, you can begin looking for pumps that can ac- commodate application requirements.

The maximum vacuum rating for a pump is commonly expressed for either continuous or intermittent duty cycles, and can be obtained from pump manufacturers. B ecause the maximum theoretical vacuum at sea level is 29.92 in.-Hg, actual pump ca- pabilities are based on and compared to this theoretical value. Depending on pump design, the vacuum limit ranges from 28 to 29.5 in.-Hg or about 93% or 98% of the maximum theo- retical value. For some pump types, the maximum vacuum rating will be based on this practical upper limit. For others, where heat dissipation is a problem, the maximum vacuum rat- ing might also take into account al- lowable temperature rise.

VACUUM TECHNOLOGY

4. Venturi-type vacuum generator produces vacuum from stream of compressed

air. Most recent designs pull vacuum to 27 in.-Hg from a source of compressed air

of less than 50 psig.

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VACUUM TECHNOLOGY

pneumatic system may have to be in- creased. Heat generation, which often is the limiting factor with mechani- cal vacuum pumps, is of little concern with vacuum generators.

Mechanical pumps most often are specified to provide a machine with vacuum on a continuous basis. But many of these machines actually use vacuum only intermittently at many different locations. In cases like this, v a c u u m g e n e r at o r s c a n p r o v i d e a practical alternative by supplying vacuum intermittently at each source rather than continuously for the entire machine.

Vacuum generators are controlled simply by initiating or terminating compressed air flow to the nozzle. Vacuum generators have been used for decades, but relatively recent im- provements have led to nozzle de- signs that provide higher operating efficiencies.

Another development using ven- turis is the multi-stage vacuum gen-

erators. In this configuration, two or more vacuum generators are piped in series to produce greater vacuum flow without using more compressed air. Essentially, the exhaust from the first nozzle (which determines the maximum attainable vacuum level) ser ves as input for a second stage. Exhaust from the second stage then serves as input for a third stage. This me ans t hat a mu lt i-st age genera- tor evacuates a given volume faster than a single-stage generator does, but they both will eventually pull the same vacuum level.

Selecting a vacuum generator de- pends on the lifting force required and the volume of air that must be evacuated. Lifting force depends on the vacuum level the generator can pull—which, in turn, depends on the air pressure supplied—and the effec- tive area of the vacuum cup. A vacuum generator should be able to pull the required vacuum in as short a time as possible to minimize air consumption.

Furthermore, the compressed air also can be used in combination with a vacuum cup by producing a puff of air to hasten release of the workpiece.

Vacuum generators operate based the venturi principle, Fig. 4. Filtered, non-lubricated compressed air enters through inlet A. A diffuser orifice (nozzle), B, causes the air stream to increase in velocity, thereby lowering its pressure, which creates a vacuum in channel C. The air stream exhausts to atmosphere through muffler D.

Vacuum generators offer several advantages. They are compact and lig htweig ht, s o t he y of ten can b e mounted at or near the point of use. They are inexpensive, and because they have no moving parts, do not re- quire the maintenance associated with mechanical vacuum pumps. They do not need an electrical power source because they generate vacuum by tap- ping into an existing compressed air system. However, if retrofitted into a machine, capacity of the existing

WHEN CHOOSING AMONG several vacuum pumps, an im-

portant factor may be how long it takes each pump to reach

the needed vacuum.

In general, a small capacity pump and a large capacity

pump with equal maximum vacuum capabilities will both

produce the same vacuum. The smaller pump simply takes

longer. How much longer depends on the capacity of the

pump and the size of the system. But simply dividing system

volume by open pump capacity won’t produce the proper

answer.

During pump-down, the higher a vacuum becomes, the

fewer air molecules remain in the closed volume. Therefore,

fewer molecules can be removed by each pump stroke. As

a result, there is a logarithmic relationship when approach-

ing a perfect vacuum. The time required to pump a system

down to a certain vacuum level can be approximated using

this formula:

t = (V×n) ÷ 4q,

where:

t is time, min

V is system volume, ft 3

q is flow capacity, cfm, and

n is a constant for the application.

When exact values are required, n is determined by using a

natural logarithm. For most purposes, though, the following

will suffice:

n = 1 for vacuum to 15 in.-Hg

n = 2 for vacuum >15 but ≤ 22.5 in.-Hg., and

n = 3 for vacuum ≥ 22.5 and up to 26 in.-Hg.

One additional complication: pump capacity in the equa-

tion is not the open capacity (capacity at atmospheric pres-

sure) usually cataloged by manufacturers. Instead, it repre-

sents the average capacity of the pump as system pressure

drops to the final vacuum level.

This value is not readily available but can be approximat-

ed from manufacturers’ pump performance curves. These

curves plot pump capacity at various vacuum levels.

To mesh these curves with the equation, simply substitute

values in the equation using pump capacity readings from

the curve at various vacuum levels at 5-in.-Hg increments,

up to the desired level. Then total these times.

Finally, note that this pump-down time is based on all sys-

tem components operating at optimum levels. A 25% ad-

ditional time allowance is recommended to compensate for

system inefficiencies and leakage.

HOW LONG TO REACH MAXIMUM VACUUM?

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