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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


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.

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.


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.


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


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.


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.


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Side channel compressors – models single-stage, two-stage, two-flow

the initial situation

The demands on the performance of side channel compressors are very different because of the wide range of possible applications. In principle, certain extreme values ​​are inherent in all possible applications. In industrial plants, for example, there is either the need for a lot of volume, ie the quantity of air conveyed per unit of time on the one hand, or the need for a lot of pressure (suction pressure or blowing pressure) on the other side. How are these different requirements profiles implemented in technical practice?

Basically, energy is converted into gas pressure and pumped volume. The energy is converted by the motor into kinetic energy of the fan wheels. Air is sucked into the duct and from there through the special molding directly into the next slat pressed. In this process, the pressure in the lamella is increased further and further (of course, physics sets natural limits), depending on how often this process is repeated.

With this knowledge one can now go two ways in the construction of a side channel fan. The energy of the motor can be used to repeatedly repeat the above-described compression process in series (in series), or to execute the entire function principle simultaneously (parallel switching).

Four illustrations are shown in the principle sketch. The upper left figure shows the simple functional principle of a side channel compressor with a simple impeller. The upper picture on the right shows a compressor with a double impeller. It produces almost twice as much air as the left variant. This is the above-mentioned parallel circuit.

The lower left figure shows a side channel compressor with an impeller but a dual compressor channel. Here, the air is compressed more and more over the double path, and almost twice as much pressure is generated per unit of time. The lower right image finally shows a side channel compressor with double impeller. In principle, two side channel compressors are connected in series (in series). The pressure becomes correspondingly larger, but also more volume is generated.

SKVTechnik offers all variants of these devices. Through its cooperation partners, SKVTechnik is able to meet almost every requirement with side channel blowers. Special designs are possible at any time.





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The electrical commissioning of side channel compressors

Part 1:

Basic notes:

Customers should carry out the work described here for electrical commissioning of side channel compressors only by a qualified electrician. The connection is to be made according to the diagram in the terminal box of the compressor and according to the relevant local regulations.

Drive motors can be three-phase motors or alternating current motors. The letters D or (…- 3) for three-phase motors are used in the device designation or E or (…- 1). The drive motor must be equipped with a motor protection switch (not necessary for frequency converter operation). For devices operated with frequency converters, the existing temperature monitor (NC contact) must be connected to the inverter and evaluated.
Special notes for operation with frequency converters:

The supply voltage of the frequency converter must not exceed 400 V without a motor filter. In the case of longer lines, higher inverter supply voltages and or exceeding the pulse voltages (maximum 1000 Vpk for drive motors up to 0.75 kW, maximum 1300 Vpk for drive motors greater than 0.75 kW) on the motor terminals, appropriate measures, e.g. a motor filter can be installed to protect the motor. Customers turn to the inverter supplier. If the motor filter is included, it must be installed between the inverter and the motor. Customers should ensure sufficient space in the control cabinet and take into account the instructions for installation and assembly in the operating instructions of the frequency converter manufacturer / motor filter manufacturer.

Caution: the maximum cable length between the motor and the frequency converter must not exceed 20 m and must be carried out with a shielded cable, if possible in the direct way and without further terminal / plug connections.

Caution: the screen braid in the connection cable must be through and on both sides, ie. The motor and the motor must be electrically connected to the earth system at the drive and the motor. On the motor side, suitable EMC cable glands are to be used, which contact the cable shield over the whole circumference at low resistance.

Refer to the operating instructions for the circuit for the three-phase, three-phase, three-phase, three-phase, three-phase, three-phase, three-phase, three-
Part 2
Rotation Check:

Switch on the side channel compressor. The direction of rotation of the impeller must correspond to the direction of the direction arrow on the fan cover of the motor on the side channel compressor. In addition, the flow direction of the air stream must coincide with the directional arrows on the muffler housing. If the direction of rotation is wrong, the connection terminals must be replaced according to the operating instructions.
Star-delta starting:

Most machines with motors above 3.0 kW are designed for star-delta start-up on the utility grid. Customers are given the information as to whether your device is equipped with a corresponding start-up circuit by studying the operating instructions. If customers prefer direct switching on (very high short-circuit current at the moment of switching on), SKVTechnik recommends consulting the power supply company.