Vacuum Generator, Unitasking
Vacuum Generator VY
Integration of ejector and blow-off (vacuum break) functions.
Advantages
Integration of ejector and blow-off (vacuum break) functions.
Integration of ejector and blow-off (vacuum break) functions. Switchover from vacuum generation to blow-off air is possible by applying or stopping supply air to ejector.
Ejector is equipped with blow-off (vacuum breaking) air function.
Compared with the conventional single stand-alone type ejector, reliable blow-off(vacuum break) is possible.
Greatly improved price compared to conventional vacuum generators with solenoid valve.
Small size and lightweight. Installation at the end of vacuum circuit is possible
High cycle of suction and blow-off is realized by the equipped shut-off valve.
Specifications
Fluid medium | Air (JIS B 8392-1:"Class 1.2.1~2.4.3") |
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Operating pressure range | 0.3~0.7MPa |
Rated supply pressure | 0.5MPa (H, L type)/0.35Mpa (E type) |
Operating temp. range | 5~50℃ (No freezing) |
Refueling | Not required |
Spec. of Vacuum filter for VY
Fluid medium | Air |
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Operating pressure range | -10~0kPa |
Filtering accuracy(*) | 5μm (Trapping efficiency:95%) |
Operating temp. range | 0~60℃(No freezing) |
Filter area | Port size 44:0.8mm2/Port size 66:1.1mm2 |
Material:PVF (Polyvinyl Formal) |
* Based on our measurement conditions.
Port size
Vacuum port
Tube dia.
mm Size (mm) | φ4, φ6, |
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Inch Size | φ1/4" |
Air supply port
Tube dia.
mm Size (mm) | φ4, φ6, |
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Inch Size | φ1/4" |
Exhaust port
Tube dia. (Exhaust port)
mm Size (mm) | φ6, |
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Inch Size | φ1/4" |
Vacuum Characteristic Graph
Construction
Type & Price list
Option & Maintenance items
Detailed Safety Instructions
3.Knurling locknut needs to be tightened firmly by hand without using any tool. Using tools to tighten the nut may cause damage to the nut or the product. Inadequate tightening may loosen the locknut and the initial setting may be changed.
Caution
1.Read and understand the instructions carefully when adjusting the flow rate and breaking time of the blow-off (vacuum breaking) air of the vacuum generator VY.
2.The vacuum filter for the vacuum generator VY cannot be replaced by the filter element alone. When the filter is replaced for maintenance or inspection, the filter itself must be replaced.
3.If different pressures are used for the supply air for vacuum generation and blow-off (vacuum breaking) of the vacuum generator VY, the pressure of the supply air for blow-off (vacuum breaking) must be set below the pressure of the supply air for vacuum generation. If the supply air pressure for blow-off (vacuum breaking) is higher than the supply air pressure for vacuum generation, it may lead to leakage.
4.When the vacuum generator VY is used in the piping method shown in the following figure, blow-off air from the check valve turns around and the blow-off air comes out of the V (vacuum) port, although it is instantaneous until the shut-off valve is completely switched off.
5.Do not apply excessive force when attaching the tube to the vacuum filter for the vacuum generator VY. The filter may be damaged.
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.