Datasheet

Multistage Ejector Series ZL
Page 1481
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Vacuum
ZL Flow Rate Charts
Selection
ZL112 ZL212
Exhaust Characteristics
Flow Characteristics
Time to Reach Vacuum
Exhaust Characteristics
Flow Characteristics
Time to Reach Vacuum
Supply pressure (MPa) Supply pressure (MPa)
Suction flow rate (l/min (ANR))
Air consumption (l/min (ANR))
150
125
100
75
50
25
Suction flow rate (l/min (ANR)) Air consumption (l/min (ANR))
300
250
200
150
100
50
0
0.1 0.2 0.3 0.4 0.5 0.6 0.1 0.2 0.3 0.4 0.5 0.6
Supply pressure: 0.4 MPa Supply pressure: 0.4 MPa
Suction flow rate (l/min(ANR)) Suction flow rate (l/min(ANR))
Time to reach vacuum (S) Time to reach vacuum (S)
130
<How to Read the Graph>
The graphics indicate the time required to reach a vacuum pressure
determined by adsorption conditions for workpieces, etc., starting from
atmospheric pressure in a 1l sealed tank. Approximately 8.8 seconds are
necessary to attain a vacuum pressure of –89.3 kPa.
Vacuum pressure
Pmax
Qmax
P1
Q1
< How to Read the Graph >
The flow characteristics indicate the relationship between the vacuum pressure
and the suction flow rate of the ejector, and show that when the suction flow
rate changes the vacuum pressure also changes. In general, this indicates the
relationship at the ejector’s standard operating pressure. In the graph, Pmax
indicates the maximum vacuum pressure, and Qmax indicates the maximum
suction flow rate. These are the values that are published as specifications in
catalogs, etc. Changes in vacuum pressure are explained below.
1. If the ejector’s suction port is closed and sealed
tight, the suction flow rate becomes “0” and the
vacuum pressure increases to the maximum
(Pmax).
2. If the suction port is opened and air is allowed to
flow (the air leaks), the suction flow rate increases
and the vacuum pressure decreases. (the condition
of P1 and Q1)
3. If the suction port is opened completely, the
suction flow rate increases to the maximum
(Qmax), while the vacuum pressure then drops
almost to “0” (atmospheric pressure). When
adsorbing work pieces which are permeable or
subject to leakage, etc., caution is required as the
vacuum pressure will not be very high.
Vacuum pressure (kPa)
10 20 30 40 50 60 70 80 90 100 110 120 20 60 100 140 180 220 260 300
Vacuum pressure (kPa)
Vacuum pressure (kPa)
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
Vacuum pressure (kPa)
123456789101112 123456
Vacuum pressure in tank (kPa)
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
Vacuum pressure in tank (kPa)
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
Tank capacity: 1l
Supply pressure: 0.4 MPa
Tank capacity: 1l
Supply pressure: 0.4 MPa
Vacuum pressure reached –89.3 kPa
–80 kPa
–40 kPa
–66.7 kPa
–53.3 kPa
–26.7 kPa
–13.3 kPa
Vacuum pressure reached –89.3 kPa
–80 kPa
–40 kPa
–66.7 kPa
–53.3 kPa
–26.7 kPa
–13.3 kPa
Vacuum pressure
m
e
Air consumption
ption
Air
um
Suction flow
rate
flow
r
S
on
Vacuum pressure
u
u
Air consumption
tion
Air co
o
Suction flow
rate
te
S
ction
ct
e
Suction flow rate