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Soundproof hoods in practical use

SKVTechnik reports on user experience when using soundproof hoods for side channel blowers. SKVTechnik has been an online retailer of side channel compressors since 2012. Since 2016, the dealer has also offered soundproof hoods that supplement the side channel blowers offered by an important component in the product portfolio.

Side channel blowers have inherently integrated silencers in the existing intake and exhaust ducts. These serve to reduce the noise emission of the side channel blowers to a level that is bearable for use near workplaces in industrial and commercial premises. The volume of side channel blowers of the SKVTechnik is different. The small 0.2kW machines are 50 dB (A). Larger side channel blowers in the 25kW class are around 80 db (A). This can become a nuisance, especially in the vicinity of the workers’ or office space. SKVTechnik offers two types of noise reduction. These are, on the one hand, additional silencers for side channel blowers and, on the other, the soundproof hoods.

First, a few words about the additional silencers.
Additional silencers for side channel blowers are mounted directly on the machine on the intake duct or on the blower duct of the side channel blower. Depending on whether the side channel compressor is a pressure application or a suction application, the additional silencer is mounted to the intake channel during the application of pressure, and the additional silencer is mounted on the exhaust channel during suction application. Additional silencers reduce the sound of the side channel blower by approx. 5-7 percent. They look tube-shaped and are integrated into the piping or tubing system near the side channel compressor if possible.

Now follows a description of the soundproof hoods.
Soundproof hoods for side channel blowers reduce the emitted sound by about 7 to 12 percent. This shows the quality of soundproof hoods. The price for soundproof hoods for side channel blowers depends strongly on the quality of the hoods.

Acoustic hoods must always match the class of the side channel blower. It is important that the process heat generated by the side channel compressor is dissipated to a sufficient extent. It is therefore not only important for customers that the available side channel blower fits into the hood, but also that the heat generated by the side channel blower is also removed from the hood. SKVTechnik offers combinations of side channel blowers and soundproof hoods, which are precisely matched to one another and can be inserted into systems with the smallest possible dimensions. Unfortunately, the waiting times for soundproof hoods with 3 to 4 weeks are considerable. Soundproof hoods are not in stock, but are manufactured on request. However, this has the advantage for customers that soundproof hoods are always adapted to the latest version of side channel blowers.

Due to the different versions of side channel blowers of SKVTechnik, there are also various types of soundproof hoods on offer. For example, the design of the intake or exhaust pipes of side channel blowers differs sometimes considerably. This concerns the position or the direction of the pipes. In addition, soundproof hoods take into account the different heat emission values ​​of side channel blowers. There are soundproof hoods that have separate fans for heat dissipation and thus provide ventilation inside the soundproof hood. Soundproof hoods are of course secured against fire and are usually provided with a metallic outer skin, which makes them resistant to weather conditions within certain limits. Soundproof hoods are not generally suitable for outdoor use. Customers ask the product consultants of SKVTechnik for such applications.

Soundproofing for side channel blowers have inside fasteners for the machines. These rails are mounted on the side channel blower from other manufacturers can be mounted. Basically, SKVTechnik always recommends to always procure the sound enclosure in conjunction with the side channel blower. Deviating from this, however, customers can also buy the soundproof hoods in addition to existing side channel compressors. Exact dimensions for the available space can be found in the product descriptions of the soundproof hoods of SKVTechnik. Experience has shown, however, that small adjustments to the old side channel blowers are always necessary.

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Clamping tables are supported by side channel compressors

In the case of industrial production processes clamping devices are frequently required for the arresting of workpieces. The workpieces should be held in a certain position and processed there.

The clamping and tensioning process should be performed quickly and easily. The arresting must be secure, so that the work piece can not be moved once. It is also important in automatic machining that the workpieces always come to the same position as the tools are relatively adjusted to the correct fit of the work piece.

As can be seen in the principle sketch, the workpiece is fixed by the suction plate for the machining operation. For this purpose, there are small holes in the plate which draw in the air. By means of this suction action, the workpiece is sucked onto the plate in such a way that it can be machined without slipping. The necessary vacuum is produced by a side channel compressor connected to the suction plate. The feeding of the workpiece can also take place with the aid of a side channel fan. For this purpose, the workpiece can be fixed to the tensioning device by means of vacuum at a suction device for the transport process. As soon as the workpiece is in the correct position in the clamping table, the vacuum is released and the workpiece is held by the vacuum on the suction plate.

Working Principle / flow:

The side channel compressor is connected to the suction plate via a pipe system. When the vacuum pump now produces vacuum, the workpiece is pulled against the table and fixed with a definable force, depending on the pressure. For switching the airflow on and off, the compressor does not need to be switched on or off again, but the airflow can be switched by a magnetic or pneumatic current reversing valve. The sucking air can now be switched over from the feeder plate located at the top in the priciple sketch. The processing operation can begin. Once the machining process has been completed, the suction air can be switched from the suction plate to the feed line and the workpiece can be removed

 

Fixiertische zur effektiven Sicherung der Werkstücke
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Drying process of washed beverage crates

Approach:

The drying process of washed beverage crates is the order of the day in the beverage industry. The crates in the circuit are subjected to a heavy load. Especially in the current spring situation, the crates, which are often stored in the open air, are exposed to increased smut effects by the pollen. On the other hand, the drinks boxes in the sales outlets should be invited by customers to buy. The drinks boxes are only, however, if these are clean and appealing.

The cleaning process is also not easy. In order to obtain the necessary stability, crates are provided with struts and reinforcements which contribute to the stability. On the other hand, these construction elements create corners and edges, which are a hindrance during the washing process and are subsequently difficult to dry afterwards.

It is best to dry the crates by blowing off the water with air. An enormous airflow and air pressure is necessary, because the crates have to be completely dry.
Operation:

In the principle sketch, a side-channel blower is used to produce the necessary volume and the corresponding pressure. The airflow is directed to two or more so-called air knives / airblades via a connected pipe or hose system and a switch. The airblades have the characteristic that an even air curtain can be built over their entire working width. The air knives are aligned on the washed wet boxes. This ensures that the crates in the back part dry as well as in the front part. The remaining water runs down through gravity. The attachment of the air knives should be flexible in order to adapt the outlet openings to the different shapes of the beverage crates.

Depending on the degree of soiling, an employee can decide whether the crates are clean or should be fed to a further wash cycle.

 

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Suction of building gases

SKVTechnik reports on the use of side-channel compressors. This article explains the principle of air extraction under buildings.

Approach:

Within industrial buildings, processes are often carried out that produce gases. If these gases are heavier than air, you will sink to the ground. This is not dangerous at first, but if these gases slowly penetrate through the floor slab of the hall into the underlying foundation, the hall can become a powder barrel. The gases collected in this way in their individual mixture can give an explosive mixture. If the gases have reached a critical concentration because more and more gases have accumulated over time, explosions can occur.

A remedy for this situation is created by the fact that these gases are specifically collected and transported away from the substructure of the building or hall. A side channel compressor connected to the collection unit draws the air continuously or via a control system via a pipe system and ensures that critical concentrations of explosive gas mixtures are not reached with the simultaneous intake of fresh air.

Operation:

The schematic diagram shows how the side channel compressor is connected to the gas collector via a pipe system. The side channel fan draws the air out of the foundation below the building above it and blows the air back to the outside of the building. If a correspondingly designed foundation ventilation is provided, it is also possible to select the opposite path and blow out the gases from the foundation by means of compressed air. The air output that the connected side channel compressor has to promote depends on the size of the hall, the gas volume and the concentration of the gas mixture under the hall. In the case of corresponding data, the design department of SKVTechnik can be allowed to carry out calculations for customers.

 

3dman_eu / Pixabay
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Reversing valves / reversing valves – current reversal during operation

Approach:

Side channel compressors are often used in systems where alternating suction pressure and blow pressure are required. Exactly these two media can be provided by the side channel compressor. Since, however, the side-channel compressors can always be active in one working direction, ie, sucking or blowing, in a normally constructed system, there are two possible constructive possibilities.

First, the user could use two side channel compressors in the system. A sucking and a blowing side channel compressor. Thats expensive. The second possibility is to switch the working direction of a side channel compressor and thus to change it from sucking to blowing direction. This can be achieved by the user with so-called current reversing valves.

Operation:

Flow reversing valves are used for side channel compressors to reverse the direction of flow. The flow direction can thus be switched from pressure operation to suction operation or vice versa. The special current reversing valve on the figure in the appendix can additionally change the line into or out of the airflow.

The change is either controlled by a 24V or 220V electrical actuator or by a pneumatic actuator.

The circuit of the current reversing valve together with the side channel compressor is as follows:

The side channel compressor is connected to the reversing valve by its sucking and blowing side. For its part, the reversing valve is connected to one or two working lines.

If the reversing valve is only connected to a working line, the valve can control electrically or pneumatically whether compressed air or suction air is to be applied in the working line.

If the reversing valve is connected to two work lines, suction pressure or blow pressure can always be applied to the work lines on the other hand.

Customers can choose between five different variants. Flange connections GAS, NPT or hose fittings are possible.

The drive system of the reversing valve is designed for continuous operation. The wide cross-sections and the shape of the passage enable the air to be conveyed with practically no pressure loss at air velocities up to 50 m / s. The illustrated version of the valve is completely made of aluminum alloy.

SKVTechnik offers all variants of the described reversing valves. Customers should contact SKVTechik for a short time in order to avoid erroneous orders.

Currently we have delivery times of 3 weeks within Germany. This applies to orders in the SKVTechik Onlineshop.