Vacuum Generator, Unitasking
Vacuum Generator VVV
Multi-stage nozzle ejector that secures high vacuum and large flow rate.
Advantages
Multi-stage nozzle ejector that secures high vacuum and large flow rate.
Multi-stage nozzle ejector that high vacuum level and large suction flow rate can be obtained with low (0.35MPa) supply pressure.
3 vacuum ports enable easy distribution.
Recommended for vacuum packaging, defoaming and deaeration as well as work adsorption transportation.
Best suited for large and heavy or porous workpiece in automobile industry and packaging industry, etc.
Easy maintenance and long life
Vacuum port direction can be changed.
Depending on the installation site, exhaust direction can be selected from straight or elbow.
Easy to check the vacuum level with digital pressure gauge.
Specifications
Fluid medium | Air |
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Operating pressure range | 0.3~0.7MPa |
Rated supply pressure | 0.35MPa |
Operating temp. range | 5~50℃(No freezing) |
Port size
Vacuum port
Tube dia.
mm Size (mm) | φ12 (3 pcs.), φ16 (3 pcs.) |
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Thread size
Taper thread (female) | Rc1/2 (3 pcs.) |
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Air supply port
Tube dia.
mm Size (mm) | φ8, φ10, φ12 |
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Thread size
Taper thread (female) | Rc1/4 |
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Exhaust port
Thread size
Taper thread (female) | Rc3/4 |
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Vacuum Characteristic Graph
Construction
Option & Maintenance items
Detailed Safety Instructions
Caution
1.If the silencer (VVSR06L) is not used or if centralized exhaust piping is used, air may flow back through the exhaust port (EX) when operation is stopped, and dust in the air or piping may enter the product, affecting product performance.
2.When using a silencer with an elbow adapter, the suction flow rate will be about 15% lower than the specification value.
Frequently Asked Questions for Vacuum Generator, Unitasking Series
Minimum operational differential pressure of Check Valve (CV, CVP series) is less than 0.001Mpa(10kPa) and it is possible to use for negative pressure.
But Check Valve tolerate leak so that it should not be used for the application with which complete air tightness is required.
Using Check Valve is not suitable for retaining for long period of time. Short period of time is the premise to install Check Valve. Also be aware of Minimum checking differential pressure.
Fluid medium is limited to air in principle.
But there are some cases which suck oil and other liquid by supply air flow in case of ring blower type vacuum generator (VRL). Exhaust air is mixed with oil and becomes nebulized at exhaust port.
"Tube exhaust type" which does not exhaust air and installing a silencer are recommended.
However, be aware when smooth plumbing without resistance is not carried out such as with too long tube to exhaust, it becomes resistance to exhaust and impair the vacuum degree.
The vacuum characteristic of each type is different.
【H type】
High-vacuum type (Rated supply pressure* : 0.5Mpa)
【L type】
Large-flow type (Rated supply pressure* : 0.5Mpa)
【E type】
High-vacuum at low air pressure supply type (Rated supply pressure* : 0.35Mpa)
For high-vacuum, H type, to provide large-suction flow, L type, and to save supply air, E type is recommended respectively. (Details of final vacuum and suction flow are determined by choice of the nozzle diameter.
*)
What is rated supply pressure?
Rated supply pressure guarantees product performance under the designated conditions and is also the supply pressure, which a vacuum generator supplies, of basis to design and use. The ultimate vacuum reaches to the max. around the rated supply pressure value.
The following graph shows the case of H type. The ultimate vacuum is the highest near 0.5Mpa. (ex. Simple vacuum generator VHH07 (Nozzle dia. 07: ø0.7mm)
When the product performance is reduced, the followings can be the causes.
Please check the product in terms of these points.
1) Check the supply air
Please check if the supply air flow volume and the air pressure are sufficient.
2) Check the nozzle clogging
When foreign substances are clogged in the nozzle, do flushing to clean it.
3)Clogging of the vacuum filter on sucking side or the silencer on the exhaust side.
When a filter is clogged, replace it with new one.
Rated supply pressure of Vacuum Generator is designated according to the vacuum characteristics (H, L and E type) respectively.
This rated supply pressure is required air pressure to start operating Vacuum Generator. When the supply air pressure is under the rated supply pressure, abnormal sound may be caused by some particular supply pressure.
During abnormal sound is being generated, the vacuum characteristics may become unstable and cause troubles such as influencing pressure detection by a sensor. Reset the product to keep the supply pressure satisfying the rated supply pressure in that case. ( Product spec. is the value in operation of Vacuum Generator.)
There are two ways of measuring pressure, absolute pressure and gauge pressure.
Absolute pressure
Absolute pressure is zero-referenced against a perfect vacuum.
It is commonly used to measure flow rate.
When indicated, "abs" is inserted following the unit, for example 10 kPa abs.
Gauge pressure
Gauge pressure is zero-referenced against ambient air pressure.
It indicate how much pressure per 1cm2 is against the ambient air pressure. It is commonly used for indication of manometer. When the pressure is over the ambient air pressure, it is called "positive pressure" and when it is under the ambient air pressure, it is called "negative pressure."
Inquiries about this product
It is also possible to suggest products suitable for various conditions such as applications and functions. Please feel free to contact us or visit the nearest sales office.
The following are frequently asked questions. Please check before making inquiries.