Efficient use of Venturi vacuum generators Utilizing

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Venturi vacuum generators have long been a viable choice for fast response, localization and vacuum feed systems. In the past ten years, people have been considering convenient and flexible solutions with fast response times. However, they are not considered energy-efficient, probably due to the use of compressed air. Using this equipment for extensive product development, especially key system accessories, is often difficult to choose the most energy-efficient products for many localized operations. In this article, we discussed the correct application and control of Venturi vacuum generators, including a brief introduction to the technology and a case study of energy calculations. When the 18th-century Italian physicist Giovanni discovered that when air was forced through a cone-shaped nozzle, his speed increased and decreased with pressure, and he and anyone else could not imagine that he would eventually produce what is today of the venturi air blowers One of the most widely used and most controversial products in the industry:


 Venturi vacuum generators. Due to the misinformation, many end users did not fully understand the benefits of the product, or more importantly, did not fully understand its limitations. To further confuse this problem, different manufacturers use different names (ie pumps, ejectors, vacuum pumps, etc.) to call them. In our opinion, the most accepted general category name is Venturi vacuum generator, which accurately describes its role. For some people, this is the best since sliced ​​bread. For others, this is the constant loss of air. In the real world, the truth lies between these extremes, depending on the application. The continuous product development of industry leaders makes these products not only convenient and responsive when applied correctly, but also often the most energy-efficient choice.


 How does the Venturi vacuum generator work? 

In the simplest form, a single-stage venturi generator causes air to flow through a tapered venturi hole. When compressed air leaves the tapered hole to restrict access to the larger open pipeline, the pressure drops and the speed increases. The intensity is such that a vacuum is formed (the pressure is lower than the ambient air pressure) and the air to be discharged from the process is sucked into the flowing airflow and discharged. 


Venturi vacuum generators have many advantages, including:

  • No vibration 

  • No heat 

  • No moving parts

  • The vacuum cleaner turns on and off immediately with the air supply

  • Very well withstands harsh conditions

  • Low cost 

  • Quick repair or replacement 

  • Can be very close to the process, reducing exhaust and 

  • Provide more Fast cycle 

  • Light and mobile 

  • No electricity required

  • Fast changeover time for service and/or component replacement


 The single-stage vacuum generator generates the Venturi effect by accelerating the compressed air through the restrictor tube, thereby expelling the required volume of air, thereby using compressed air. These single-stage venturi generators have limited capacity and cannot be effectively adapted to many applications because their basic design is configured to accommodate increased flow or empty volume requirements. Generally, the ratio of compressed air consumption (scfm) to vacuum flow (the rate at which atmospheric pressure is removed from the system) of this type of vacuum generator does not exceed 1:1, sometimes as high as 2 or 3: Multi-stage vacuum generation has been developed In order to improve this efficiency in many applications. Multi-stage devices use a series of ejectors and nozzles to allow compressed air to expand in controlled stages. This usually increases the ratio of compressed air consumption to vacuum flow to approximately 1:3 or better. Multi-stage devices are also significantly quieter and can create a vacuum at lower pressures. This performance will reduce the compressed air flow required under the same conditions and/or reduce reaction time and increase productivity. 


Coaxial is a multi-stage vacuum generator. The multi-stage valve is installed around the tube covered by the coaxial, which significantly simplifies the flow profile through the generator. This design enables the coaxial filter element to meet and provide different flow and pressure requirements. In many cases, the coaxial sleeves in the generator body can be interchanged to allow the same hardware to meet different conditions with the best energy efficiency at a relatively low cost.


 Correct application of vacuum technology to reduce energy costs 


The newly developed multi-stage coaxial can be successfully applied to reduce the inlet compressed air pressure, thereby reducing the use of compressed air to produce a similar degree of vacuum. Coaxial pumps are usually interchangeable with the main body, so that the performance can be easily and cheaply changed to adapt to new conditions (ie inlet pressure, evacuation rate, etc.). Most of the vacuuming time is 12"Hg and deeper vacuum. The increase in vacuum from 18" to 27"Hg is more than 10 times. Therefore, it is very important to use a lower vacuum and larger cups as much as possible. The correct cup selection is very important. 


To optimize operating costs and productivity, new suction cup technology continues to expand opportunities. Every time you have to run a vacuum generator, you will use compressed air. On the contrary, once a full vacuum is reached, it is very energy efficient to close the air line leading to the vacuum and use the correct valve to maintain the vacuum without using air. Some porous materials do not allow this, but many materials do. In many cases, these controls are executed by the PLC software program provided by the machine manufacturer. There is also a air vacuum of a venturi blower generator whose automatic control is fully integrated with the generator housing. We discovered a very common error when we conducted a complete analysis of the factory system. Factory personnel were told to turn off the vacuum generator


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