5-p0921-0943-vba_en.pdf - 第9页

VBA22A, 42A Air-operated type Pilot pressure IN (Inlet) Governor Booster chamber A Drive chamber A Switching valve Piston Drive chamber B Booster chamber B Check valve OUT (Outlet) E Piston rod General line (low pressure…

Tc Ts

Pressure

Stroke

Upper limit of pressure inside the tank P3

Inlet pressure P1

Time

Necessary supply

pressure to cylinder P

Sizing

( )

END

START

YES

YES YES YES

YES

When running continuously for longer periods of time, confirm the life expectancy.

When the life expectancy is shorter than required, select a larger sized booster regulator.

Select the tank

from table below.

Judgement of

flow rate

Extend

stop time Ts

up to charge time

T or more.

Avoid

pulsation.

(Max. 0.05

MPa)

Judgement

of charge time

T ≤ T s

Provide requisite

conditions for

selection.

Calculate required

air flow rate Q.

Select booster regulator

size from flow-rate

characteristics table.

Obtain the tank

capacity V.

Select the tank

capacity over V.

Calculate time T from

charge characteristics

table.

Increase number of

booster regulators (Z)

to decrease T.

Tank model

VBAT05

VBAT10

VBAT20

VBAT38

VBA1A

—

VBA2A

—

VBA4A

Applicable combination modelInternal capacity

5 L

10 L

20 L

38 L

•

Use the VBA11A (pressure increase ratio 4) with pressure

increase ratio 2 to 4. Usage of pressure increase ratio below 2

is preferred for the VBA10A (pressure increase ratio 2).

A stable operation and increased life expectancy will result.

•

Inlet supply pressure volume is {approximately twice (pressure

increase ratio 2), approx. 4 times (pressure increase ratio 4)}

the volume of the outlet side. Booster regulator requires the

inlet side volume which is the sum of the flow volume running

into the outlet side and the volume exhausted from E port (for

driving), because air is the power source.

Sizing can be achieved with the SMC Pneumatic System Energy Saving Program Ver. 3.1

which can be downloaded from the SMC website: http://www.smcworld.com

Caution

Lower limit of pressure inside the tank P2

100

200

0.5

0.8

Example

Necessary conditions:

D [mm]: Cylinder bore size

L [mm]: Cylinder stroke

W [mm/s]: Cylinder operating speed

C [pc.]: Number of cylinders

Tc [s]: Cylinder operating time

Ts [s]: Cylinder stop time

1 [MPa]: Inlet pressure

2 [MPa]

Note 1)

: Necessary supply

pressure to cylinder

Note 1) P2 is the necessary supply pressure to a cylinder, and set the pressure below the lower limit of pressure inside the tank

with a regulator. Adjust the pressure taking the maximum operating pressure of equipment in use into consideration.

Note 2) P

3 is the output pressure of the booster regulator, which is also the upper limit of charge pressure to the tank.

Other conditions:

Q [L/min (ANR)]: Required air flow rate

Qb [L/min (ANR)]: Outlet air flow rate of booster regulator

Tc [s]: Cylinder operating time

K: Cylinder double-acting: 2, single-acting: 1

3 [MPa]

Note 2)

: Tank charge pressure

1 [s]: Time to charge (Time to charge to P2)

2 [s]: Time to charge (Time to charge to P3)

[s]: Time to charge (Time to charge from P2 to P3)

Z: Number of booster regulators

Q [L/min (ANR)] =

π x D

x W

+ 0.101)

x 60 x C

4 x 10

0.101

Q =

π x 100

x 200 (0.8 + 0.101)

x 60 x 1 = 841 [L/min (ANR)]x

4 x 10

0.101

Refer to “Flow-rate Characteristics” on pages 926 and 927.

VBA2A: Qb = 600 [L/min (ANR)]

VBA4A: Qb = 1050 [L/min (ANR)]

NO: Need no tank

The VBA4A can supply necessary pressure.

The VBA2A cannot obtain necessary pressure.

3 – P2) x 9.9

V [L] =

(Q – Qb/2) x (Tc x K/60)

V = = 4.6 [L]

(1.0 – 0.8) x 9.9

Select the VBAT10, which can be

directly connected to the

VBA2A.

(841 – 600/2) x (0.5 x 2/60)

Refer to “Charge Characteristics” on pages 926 and 927.

T = ( ) x = 3.5 [s]

T [s] = ( ) x

2 – T1V

4.6

11.5 – 3.8

Series VBA

øD

P3P1

928

VBA22A, 42A

Air-operated type

Pilot pressure

IN (Inlet)

Governor

Booster

chamber A

Drive

chamber A

Switching valve

Piston

Drive chamber B

Booster chamber B

Check valve

OUT (Outlet)E

Piston rod

General line (low pressure) Locations requiring high pressure

Shortening time

Without check

valve by-pass

Time t (S)

Outlet pressure (MPa)

Operating pressure:

0.5 MPa

Bore size: ø100

Output ≈ 3850 N

Operating pressure:

0.8 MPa

Bore size: ø80

Output ≈ 4000 N

Equivalent

output

0.5 MPa

ø100

IN 0.5 MPa

ø80

OUT 0.8 MPa

VBA

Circuit Example

Working Principle

The IN air passes through the check valve to booster chambers A and B. Meanwhile, air is supplied to drive chamber B via the governor and

the switching valve. Then, the air pressure from drive chamber B and booster chamber A are applied to the piston, boosting the air in booster

chamber B. As the piston travels, the boosted air is pushed via the check valve to the OUT side. When the piston reaches to the end, the piston

causes the switching valve to switch, so that drive chamber B is in the exhaust state and drive chamber A is in the supply state respectively.

Then, the piston reverses its movement, this time, the pressures from booster chamber B and drive chamber A boosts the air in booster

chamber A and sends it to the OUT side. The process described above is repeated to continuously supply highly pressurized air from the IN to

the OUT side. The governor establishes the outlet pressure by handle operation and pressure adjustment in the drive chamber by feeding back

the outlet pressure.

VBA10A, 20A, 40A, 43A

Initially, inlet pressure (P1) passes through the check valve, fills P2,

and results in P1 = P2.

• When only some of the machines in the plant require high-pressure

air, booster regulators can be installed for only the equipment that

requires it. This allows the overall system to use low-pressure air

while accommodating machines requiring high-pressure air.

• When the actuator output is insufficient but space limitations prohibit

switching to a larger cylinder diameter, a booster regulator can be

used to increase the pressure. This makes it possible to boost the

output without replacing the actuator.

• When a certain level of output is required but the cylinder size must

be kept small so that the driver remains compact.

• When charging a tank or the like from a source at atmospheric

pressure, a circuit with a check valve can be used to reduce the

charge time by allowing air to pass through the check valve up to

the inlet pressure.

• When only one side of the cylinder is used for work, booster

regulators can be installed only on the lines that require them to

reduce the overall air consumption volume.

Booster Regulator Series VBA

(Two-stage

pressure boost)

VBA

Plant line (source pressure)

Piston rod

EOUT (Outlet)

Check valve

Booster

chamber B

Drive

chamber B

Piston

Switching valve

Drive

chamber A

Booster

chamber A

Governor

IN (Inlet)

VBA11A

929

ARJ

AR425

to 935

ARX

AMR

ARM

ARP

IRV

VEX

SRH

SRP

SRF

VCHR

ITV

ITVX

PVQ

VEF

VEP

VER

VEA

VY1

VBA

VBAT

AP100

VBA

VBAT

Design

Warning

1. Warning concerning abnormal outlet pressure

• If there is a likelihood of causing an outlet pressure drop

due to unforeseen circumstances such as equipment

malfunction, thus leading to a major problem, take safety

measures on the system side.

• Because the outlet pressure could exceed its set range if

there is a large fluctuation in the inlet pressure, leading to

unexpected accidents, take safety measures against abnor-

mal pressures.

• Operate the equipment within its maximum operating

pressure and set pressure range.

2. Residual pressure measures

• Connect a 3-port valve to the OUT side of the booster

regulator if the residual pressure must be released quickly

from the outlet pressure side for maintenance, etc. (Refer to

the diagram below.) The residual outlet pressure side

cannot be released even if the 3-port valve is connected to

the IN side because the check valve in the booster regulator

will activate.

• After operation is finished, release the supply pressure at

the inlet. This stops the booster regulator from moving

needlessly and prevents operating malfunctions.

Selection

Caution

1. Check the specifications.

• Consider the operating conditions and operate this product

within the specification range that is described in this

catalog.

2. Selection

• Based on the conditions (such as pressure, flow rate, takt

time) required for the outlet side of the booster regulator,

select the size of the booster regulator in accordance with

the selection procedures described in this catalog or model

selection program.

• Use the VBA11A (pressure increase ratio 4) with pressure

increase ratio 2 to 4. Usage of pressure increase ratio

below 2 is preferred for the VBA10A (pressure increase

ratio 2). A stable operation and increased life expectancy

will result.

• Inlet supply pressure volume is {approximately twice

(pressure increase ratio 2), approx. 4 times (pressure

increase ratio 4)} the volume of the outlet side. Booster

regulator requires the inlet side volume which is the sum of

the flow volume running into the outlet side and the volume

exhausted from E port (for driving), because air is the power

source.

• When running continuously for longer periods of time,

confirm the life expectancy. The life expectancy of a booster

regulator is dependent upon the operational cycle. Thus,

when used for driving cylinders, etc. in the outlet side, life

expectancy will be reduced.

• Make sure the outlet pressure is set 0.1 MPa or higher than

the inlet pressure. A pressure difference below 0.1 MPa

makes the operation unstable and may result in a malfunc-

tion.

Mounting

Caution

1. Transporting

• When transporting this product, hold it lengthwise with both

hands. Never hold it by the black handle that protrudes from

the center because the handle could become detached

from the body, causing the body to fall and leading to injury.

2. Installation

• Install this product so that the silver-colored tie-rods and

cover are placed horizontally. If mounted vertically, it may

result in a malfunction.

• Because the piston cycle vibration is transferred, use the

following mounting bolts (VBA1: M5; VBA2, 4: M10) and

tighten them with the specified torque (VBA1: 3 N·m; VBA2,

4: 24 N·m).

• If the transmission of vibration is not preferred, insert an

isolating rubber material before installation.

• Mount the pressure gauge with a torque of 7 to 9 N·m.

Piping

Caution

1. Flushing

• Use an air blower to flush the piping to thoroughly remove

any cutting chips, cutting oil, or debris from the piping

inside, before connecting them. If they enter the inside of

the booster regulator, they could cause the booster regula-

tor to malfunction or its durability could be affected.

2. Piping size

• To bring the booster regulator’s ability into full play, make

sure to match the piping size to the port size.

Air Supply

Caution

1. Quality of air source

• Connect a mist separator to the inlet side near the booster

regulator. If the quality of the compressed air is not

thoroughly controlled, the booster regulator could malfunc-

tion (without being able to boost) or its durability could be

affected.

• If dry air (atmospheric pressure dew point: –23°C or less) is

used, the life expectancy may be shortened because dry air

will accelerate evaporation of grease inside.

Operating Environment

Caution

1. Installation location

• Do not install this product in an area that is exposed to

rainwater or direct sunlight.

• Do not install in locations influenced by vibrations. If it must

be used in such an area due to unavoidable circumstances,

please contact SMC beforehand.

Series VBA

930