Modern manufacturing enterprises, regardless of the profile of their products, use energy among other types of energy in many production processes compressed air.
A similar type of energy is used in pneumatic drives of modern machine tools and during unloading bulk materials, and in the production of PET containers.
The main source of generating this type of energy is air compressors.
Modern air compressor - this is complex technological equipment, which, thanks to various technologies air compression has its own classification: centrifugal, screw and piston air compressors.
Main parameters of compressor equipment
When choosing an air compressor, the consumer, depending on the purpose of operating the equipment, always pays attention to basic parameters of an air compressor- this is the engine power (hence the energy consumption, and therefore the cost of generating compressed air), pressure (from low pressure, for example, to maintain combustion in furnaces, or unload cement until high pressure required for pressure testing of pipelines or test benches), and, finally, productivity, that is, the amount of compressed air of the required pressure per unit of time.
But often, consumers do not pay attention to another important parameter - the noise produced compressor equipment while working. And in vain. After all, many modern production, having high demands on standards production processes, strive to improve comfort in the workplace. In such cases, many factors are taken into account - air purity, lighting, temperature, and, among other things, the sound background.
Compressor equipment with reduced noise levels
Understanding the importance of such a parameter of air compressors as the noise produced during operation, DALGAKIRAN constantly strives to reduce the noise threshold of its equipment, thanks to the design of the equipment, as well as the use of the most modern soundproofing materials.
In addition, advocating the objectivity of the accompanying technical data, DALGAKIRAN included a test for the level of reproduced noise in the compulsory testing program for compressors.
Thus, each unit of the company's products is guaranteed to meet the declared noise characteristics.
Silent Air Compressors
In any production, be it medicine or industry, an air compressor is needed. Thanks to this equipment, a clean air flow is created that does not contain foreign components and harmful substances. All this allows us to maintain comfortable working conditions, as well as safety for the health of workers and visitors. In our store you can buy silent air compressor at a favorable price.
What are silent air compressors
Such designs are universal devices who are capable silently purify the air in room. The devices are supplied in a compact structure. Housing made from of stainless steel, is lightweight. Therefore, transportation and delivery of such technical means does not cause problems.
No noise and high performance
The main “advantage” is the complete absence of any sounds when the compressor is operating. These units are based on an electric motor, which allows the compressor to be used in rooms of any size.
Modern silent air compressor models, such as those presented on our website, have increased performance, which allows you to use them non-stop for several days. The device itself is a design with a long wear life, thanks to the presence internal system cooling, which eliminates the load on the motor.
Ease of control is another undeniable advantage of air compressors.
And of course high efficiency and equipment reliability: each compressor is equipped with a special filter that cleans the air from germs and bacteria, unnecessary odors and components. The result of the compressor is a clean, cooled air flow that is absolutely safe for humans and the environment.
Oil and oil-free models
In general, all compressors can be divided into two types: oil and oil-free.
Oil-oil models are usually as quiet as possible and subject to less wear. They are used in cases where it is necessary to create the most comfortable working conditions. But they have their limitations. Oil, although in minimal doses, penetrates into the compressed air, which does not fully guarantee maximum fresh air at the exit. Of course, such a small amount of oil is absolutely harmless for industrial use, but is not recommended for medical field activities, work with optical instruments and in research laboratories. Oil-free models solve this problem.
Types of compressors by area of use
Compressors for industrial production will become excellent choice to solve production problems with minimal operating costs.
The most reliable and efficient models will find their application in laboratories and research centers.
Compressors for dentistry and medicine They are distinguished by their ability to generate perfectly clean air, without oil contamination and with extremely low noise levels.
Buy a silent air compressor
In our online store you can buy suitable model equipment High Quality at a favorable price.
- This equipment, despite its quiet operating mode, technical parameters practically not inferior to bulky and noisy industrial installations designed for high load and long-term use.
- The performance of the offered compressors, depending on the model, ranges from 60 to 650 liters of air per minute. For comparison: the same parameter of a conventional piston device reaches only 520 l per minute.
- The pressure created by such a compressor varies from 3 to 13 atm. In this case, the power is from 0.75 to 4 kW, and the required mains voltage is 220 or 380 V.
- The assortment includes various models compressor equipment with a low noise threshold, manufactured at foreign factories under the brands Comprag, Remeza, etc.
To buy a quiet air compressor from EnergoProf, contact the company's employees. Phone numbers are listed in the header of the page and in the “Contacts” section. The range includes a large number of low-noise compressors of different capacities. Please study our offer carefully before purchasing.
When there is a need to purchase a compressor, as a rule, it is selected taking into account such parameters as: inlet capacity, outlet capacity, pressure, receiver volume, etc. But cases often arise when such an indicator as noise level.
There is a whole group of compressed air consumers for whom this indicator is of decisive importance when choosing compressor equipment. These include hospitals, dental offices, chemical laboratories, research institutes, manufacturers of electronic circuit boards (chips), workshops for the production of photo books.
For them, the noise level is of decisive importance, since the compressor equipment is located indoors in close proximity to where people work and is designed to operate for a long period of time. When using, for example, a classic piston compressor, whose noise level can range from 80 to 100 decibels (db), you can get a real headache when using it. long work in a confined space. This is especially problematic for rooms not industrial use. Because 100 dB. comparable to the operation of a motorcycle engine or the operation of a powerful hammer drill on a construction site.
At first, of course, you can adapt by leaving the room while the compressor is running, or wearing sound protection, especially since the noise level is 120 dB or more. this is already directly regulated by labor safety regulations. However, high noise levels cause constant inconvenience, including for others. In this regard, there is a need for compressors that have a low noise level or are ideally silent. But noiselessness is also a relative concept, because a person practically stops hearing if the noise scale drops below 10-15 dB. Here again everything is individual. Below is a figure that allows you to roughly correlate the number of decibels and noise level.
With regard to compressor equipment, it is necessary to understand that, depending on its type, it has an inherent different level noisiness. Thus, one of the loudest compressors are piston compressors with a belt drive, whose noise level can exceed 100 dB. Direct drive piston compressors have a lower noise level and it ranges from 80 to 90 dB. Oil-free compressors have the lowest noise level of traditional compressors, which due to their design feature produce less noise, it can fluctuate within 70 dB. If we consider the entire range of compressor equipment, we can also note screw or scroll compressors, in which the noise level is quite low. But screw compressors belong to the class industrial equipment, have high productivity (from 500 lit./min.) and therefore price. A scroll compressors In general, they have a pronounced specialization in the medical and food industries.
What to do if there is no need to overpay for high compressor performance in industrial scale? The fact is that leading manufacturers of compressor equipment have long realized the need for low-noise compressors and are currently producing individual models or even entire series of compressors with low noise levels. Such compressors have the words “low noise”, “quiet”, “silent”, etc. in their names. All of them, in essence, are aimed at one thing - to produce a low noise level during operation, comfortable for human work. And here manufacturers take different paths: some of them create special noise-proof casings for compressors, which cover the piston block, and often the compressor engine, and thereby reduce its noise. Such technologies are typical when low-noise compressors are created on the basis of oil compressors. As an example, we can cite a whole series of low-noise compressors, which have a solid noise-proof casing, thanks to which the noise level is quite effectively reduced.
Another way is to create fundamentally new piston block designs, which, on the one hand, will allow maintaining sufficient performance for operation, but at the same time reduce the noise level during compressor operation. This is more typical for oil-free models. And here, as an example, we can cite the company “Remeza”, whose compressors are equipped with original “Twin-cilinder” piston blocks.
They allow the compressor to reduce the noise level to 65 dB. Such compressors can already be classified as low-noise. Direct analogue of the series « OLD" from "Remez_y" is a compressor TM QuattroElementi (Ergus)
At the same time, there are manufacturers specializing in the production of silent oil compressors. These include the English manufacturer « BAMBI", it produces truly unique models that differ in noise levels 40 db., which is perceived by the human ear as work modern refrigerator. from « BAMBI" is the “quiest” in the entire line of the English manufacturer.
An American company is also working in the same direction. "Jun-Air", the noise level of which in the most “advanced” models also ranges from 35 to 40 dB.
These compressors have a truly low noise level, but for such pleasure, as they say, “you have to pay”, since these compressors are more expensive than their noisy counterparts. However, here everyone chooses for themselves: pay extra for comfort or work with a constant headache. Therefore, no matter what choice is made, the most important thing is that it always exists.
Many types technological equipment require compressed air. A huge number of compressors are produced for this purpose, including silent ones. The task of choosing a model that is suitable for its parameters in practice turns out to be much more difficult than it might seem at first glance. Let's try to figure out what types of compressors there are and how to choose the right one optimal model, using the example of British silent compressors BAMBI.
Choosing a compressor usually begins with choosing its type. For equipment with low air consumption, traditional piston compressors with an electric motor of low and medium capacity are suitable: oil and oil-free. Oil-oil models tend to be quieter and subject to less wear. The oil compressor pump is usually mounted in a metal casing filled with oil, which reduces noise to modern levels. household refrigerator. At the same time, such a compressor provides sufficient performance: about 50 l/min. at pressures up to 8 bar. It is worth noting that productivity can be increased by cascading two or more pumps, the noise level will increase slightly: by 2-3 dB.
Oil compressors (Fig. 1) are widely used in cases where it is necessary to ensure silence and comfort in work area, while they are very reliable and inexpensive. However, the presence of oil in the crankcase imposes some restrictions on the use of the compressor, and this is due to the fact that oil, although in small doses, still gets into the compressed air. The standard air filter (Fig. 2), which is equipped with all compressors, retains oil particles to a significant extent, but this does not guarantee absolutely clean air at the outlet. A small amount of oil in the air is absolutely harmless for industrial applications, but can be a problem for medical equipment, optical instruments and some research laboratories. In addition, oil compressors require constant monitoring of the oil level (Fig. 3) and periodic maintenance associated with its regular, usually annual, replacement. For this reason, they are not recommended for use with fully automated equipment, where the participation of personnel is completely excluded.
Rice. 3.
In such cases, it is advisable to use oil-free compressors. In the BAMBI model range they are represented by the HT and VT series. The pump of such compressors has a capacity of 100 to 300 l/min, but the performance decreases significantly with increasing operating pressure. The pump does not require monitoring or maintenance; oil entering the air is completely excluded. At the same time, the compressors operate relatively quietly: the noise level is only 53 dB. NT series compressors (Fig. 4) have compact dimensions, and the largest receiver is 24 liters. This makes them optimal for equipment with low air consumption.
Rice. 4.
The VT series (Fig. 5) is represented by models with higher productivity - from 120 to 440 l/min. on Idling. They are also maintenance-free and designed for long, trouble-free operation. These are large industrial compressors, and they can be called silent only conditionally and only in comparison with most similar systems from other manufacturers. A more correct definition would be “low noise”, given their noise level of 72-76 dB. Still, this is a fairly low noise level for compressors of this performance, and it is achieved thanks to a unique dual pump module with a V-shaped arrangement of working cylinders (Fig. 6). Compressors of this series are equipped with a special electric valve, which reduces the pressure in the compression chamber after the system is turned off. This ensures a smooth engine start, reduces the load on all mechanical parts of the pump and extends the life of the compressor. It is possible to equip a compressor automatic system draining the condensate into a special container (Fig. 7).
If pneumatic equipment requires dry air, then any model of the VT series can be equipped with unique system air drying. The air is first cooled (Fig. 8), then micro drops of water (less than 0.01 microns) are retained in the dehumidifier filter. This removes 99% of the moisture before the desiccant starts working. The built-in microfilter removes all possible residual contaminants. The drying module is made of stainless steel and self-cleans with each compressor cycle, so it does not require any maintenance.
So, when choosing a compressor, you always need to find a compromise between performance and noise level and take into account the requirements for the purity of compressed air. But there are piston compressors that are silent, efficient and produce ideally oil-free air. First of all, these are special medical oil compressors BAMBI ML series (Medicine and Dentistry - medicine and dentistry), which have the maximum high performance with minimal noise and compactness. The series is designed for cases where particularly clean compressed air and silence in the room are required. The “heart” of MD compressors (Fig. 9) is the 175 air module, which is 50% more efficient than other systems with the same noise level. This is the only oil-based one in the world compressor block, which has a special piston with unique piston rings that prevent oil from entering the compressed air (Fig. 10). Since the MD series compressors have a sound level of only 40 dB and are virtually vibration-free, they can be located in close proximity to personnel: they do not create any noise problems for people.
The second solution, which ensures both the absence of oil and low noise levels, is the use of a sound-absorbing casing. For example, in the small HTS5 model, thanks to the casing, the noise compared to other HT series compressors is reduced by 7 dB and is only 46 dB - this is a record low for an oil-free compressor.
There is a similar solution for compressors over high performance. In cases where a high-performance compressor needs to be installed close to where personnel work, the VTS series is recommended. Models in this series are built on the basis of VT compressors, but are equipped with a casing that significantly reduces the noise level (Fig. 11) and allows the device to better fit into the interior of a laboratory or workplace. The housing of VTS compressors is equipped with a ventilation system with temperature sensors that cools all working parts, so that with the use of a casing, this series does not lose in reliability and performance characteristics.
Any silent or low-noise piston compressors consist of a pump with an electric motor and a receiver. Chances are you can already determine what type of compressor you need. It remains to figure out what volume of receiver you need and what the pump’s performance should be. Choosing a model with the most suitable parameters is quite simple.
Pump performance calculation
Reciprocating compressors are designed for short-term operation at a certain shift utilization rate or duty cycle, usually not exceeding 50%. That is, the pump should rest for the same amount or longer than pumping air into the receiver. The total average air consumption of all connected consumers must be at least two times less than the pump performance at operating pressure:
K andn is the utilization rate of each consumer connected to the compressor;
Kvi - coefficient of compressor intra-shift use: this value is individual for each compressor.
For all BAMBI compressors, Kvi is 0.5. In this case, the pump will operate in the correct mode, and the pressure at the compressor outlet is guaranteed not to fall below that required for your pneumatic tool.
For example, you want to connect an air screwdriver. IN technical specifications it is indicated that it consumes 10 cfm or 280 l/min. at a pressure of 6 bar. And the installer will work with it on the assembly line, tightening screws into the product housing. The installer receives a new product every 5 minutes. and tightens 10 screws, 2 seconds each. It turns out that the screwdriver consumes 280 l/min. only 20 s every 5 minutes, and on average 280x20/300 = 18.7 l/min. Let's make a small reserve, rounding this value to 20 l/min. It turns out that we need a compressor with a pump capacity of at least 40 l/min. at a pressure of 6 bar. Compressors with one pump of the BB series do not fit into these parameters, but, for example, an oil compressor MD75/80 or an oil-free NT15-2R will do.
When working with piston compressors, it is necessary to remember that any, even the most reliable model, working more than the established limit or continuously, inevitably overheats. Overheating, depending on the degree, is possible! to increased wear of the cylinder-piston group, and the compressor can quickly fail. If you have not established the exact operating conditions of the compressor, then the performance reserve needs to be made as large as possible.
Calculation of receiver volume
The volume of the receiver (Fig. 12) affects the supply of air that is enough for continuous operation of the tool without the pressure dropping below the working one:
where G n is the consumption of uncompressed air;
t nрn is the required continuous operation time of each consumer connected to the compressor;
ΔP-range of pressure adjustment in the receiver, bar.
The compressor pump is configured so that the engine stops working when the pressure in the receiver reaches 8 bar and starts pumping air when the pressure drops to 6 bar. Six bar is usually sufficient for any tool used to work with electronics, and this is the operating pressure you should expect.
Omitting clarifications, we can assume that with a 100% filled receiver, you have an air supply of two volumes of the receiver until the pressure drops below 6 bar. The volume of air consumed by your pneumatic tool during continuous operation should be less than two volumes of the receiver. If you work at lower pressure, then there will be more air stored in the receiver.
For the pneumatic screwdriver from our example, a receiver volume of no less than 280x20/2 = 47 liters will be required. For such an operating time, you need a large receiver, for example, BAMBI BB50D, MD150, or any compressors from the older lines - VT and VTS. However, if the screwdriver operated at a pressure of 3 bar, then a 19 liter receiver would be enough.
We hope that the recommendations in this article for choosing a compressor will help you understand the variety of parameters of pneumatic equipment and choose the optimal model for your task. This will not only save your money, but will also ensure long and trouble-free operation of the compressor, and therefore the equipment itself.
Catalog with prices: Silent air compressors BAMBI (UK)
Noisiness is one of the most important parameters compressor designed for operation in habitable spaces. For compressed air production plants, performance and maximum pressure, however, the level of noise produced is also important for them. Designers are constantly working to reduce equipment noise, creating silent models for medicine, aquarium aeration, hobbies and precision manufacturing.
Types of compressors
According to the method of air compression, compressors are divided into three main types:
- piston;
- rotary;
- membrane
The most common and affordable piston compressors are the loudest. This is due to the peculiarities of their work:
- a large number of moving parts;
- opening and closing valves;
- air passes through channels of variable cross-section.
To reduce noise, special Constructive decisions, such as an oil-free quiet compressor. Another direction is to increase the number of cylinders. Two-cylinder models have smaller piston sizes and are less noisy.
Membrane devices have fewer moving parts, create a lower pressure drop and are therefore structurally the quietest.
Rotary (and their subtype - scroll) compressors also have a minimum of moving parts and create an average noise level. They are difficult to manufacture and are designed for permanent job. Noise is the determining parameter of choice for many consumers who use low-noise units. These include:
- medical institutions;
- research laboratories;
- ultra-precision production.
Medical applications require truly silent air and liquid compressors. This can be achieved either by reducing productivity and increasing dimensions, or by moving the device to an adjacent room.
In ultra-precise high-tech industries, silent compressors are used to drive pneumatic tools.
Prolonged exposure to high noise conditions leads to rapid fatigue, decreased attention, and the development of diseases of the hearing organs and nervous system.
To create high level Airborne noise and accompanying mechanical vibrations (vibrations) consume energy. Therefore, in addition to the direct harm caused airborne noise people, animals and precision equipment, noise also leads to unnecessary costs energy resources, reducing potential productivity. Is the compressor silent or the compressor efficient? Modern technology provides an answer to this question. A compressor that is both silent and efficient will be expensive.
Rotary
In such structures, air is compressed as it passes between parts complex profiles two or more constantly rotating augers. They can be of two subtypes:
- screw;
- spiral.
Such systems are quite silent because they have no rubbing or colliding parts. Rotary compressors allow you to achieve high pressure values; they have a long service life, reaching several hundred thousand hours.
Their peculiarity is that long-term warm-up is required to reach operating mode. Therefore, such circuit solutions are used where the supercharger must operate constantly - in large technological installations, large centralized systems compressed air distribution.
The design and manufacture of mating profiles of working screws is expensive; such superchargers cost several times more than piston ones. Maintenance and repairs also cost large sums.
Membrane
Such silent designs also called diffusion. Their main working body is an elastic membrane, which is driven by a rotating eccentric. Compared with piston systems the number of moving parts is minimal, the elastic membrane absorbs and dampens sound frequency vibrations. Therefore, the noise level of such superchargers is minimal - from 30 dB in models for operational and ultra-precision production. To the ear, their work sounds like the quiet sigh of a child.
The simplicity of the membrane-type device ensures its high reliability and significant service life - it reaches hundreds of thousands of hours. However, they develop a small pressure - up to three atmospheres. Productivity is also poor.
Piston
Such designs are well developed, inexpensive to manufacture and easy to maintain. Their characteristic features:
- ability for repeated on/off;
- a large number of rubbing and colliding parts;
- low cost in production and maintenance;
- high noise up to 120 dB;
- short motor life (up to 10 thousand hours);
- tendency to overheat.
The combination of these properties makes the unit indispensable in small workshops that use compressed air, and the noise can be tolerated.
Silent piston compressors are significantly more expensive than conventional ones
Principle of operation
The physical principle of creating working pressure is the same for all types of compressors. Air (or other working medium when atmospheric pressure enters through the inlet pipe into the working chamber. Its volume decreases in one way or another, while the pressure increases. The working medium at increased pressure leaves the working chamber through the outlet pipe. A portion of air is again introduced into the chamber at normal pressure, and the cycle repeats.
Depending on the type of supercharger, this principle is implemented structurally with the following differences:
- Piston. The inlet and outlet pipes are blocked by valves that isolate the working chamber. The inlet opens when a new portion of air is launched, the outlet opens at the end of the compression cycle to release the compressed working environment to the highway. Compression occurs due to the translational movement of the piston, which reduces the volume of the cylinder.
- Membrane. It also has pipes that act similarly. The change in chamber volume occurs due to the deflection of an elastic membrane made of rubberized synthetic fabric or from polymer film. A rotating eccentric rests against the center of the membrane, which periodically deforms it. The membrane returns back under the influence of its own elasticity.
- Rotary. The working chamber does not have a permanent configuration. These are narrowing passages between spiral or screw-shaped augers rotating rapidly towards each other. The augers capture air and push it further among themselves, just as a screw moves meat in a meat grinder from the neck to the knives and grate. There are no valves as such; the air is retained by the constant movement of the screws.
To create low-noise and silent piston compressors, a number of approaches are used. This:
- the use of special materials that absorb noise and vibration;
- more precise processing of mating parts;
- careful acoustic calculation of the structure, elimination of flow noise and possible resonance phenomena;
- an increase in the number of cylinders simultaneously with a decrease in their sizes;
- replacing noisy cast iron piston rings with fluoroplastic ones that do not require lubrication.
As a result, it is possible to bring the level of air radiation to acceptable values of 35-40 dB. Such a piston supercharger can be considered almost silent
Aquarium pump
After the refrigerator compressor, these are the most common devices operating in close proximity to humans. They are designed to improve the oxygen supply to fish and other pets living in the aquatic environment. The following types of devices are used for equipment and arrangement of the aquarium:
- piston;
- membrane
Piston engines provide better performance per unit of power. Experts recommend using them for aerating large containers.
The performance of a membrane-type pump is significantly lower; it is suitable for small aquariums.
Aquarium models are specially designed to be silent. Acoustic emission level membrane devices reaches medical requirements of 30-32 dB - such aerators can work in bedrooms. If the compressor noise level is above 35 dB, it is better to move the aquarium to the kitchen or living room.
Compressor selection options
The main parameters by which buyers choose silent superchargers are the following:
- operating pressure, (atm. or bar);
- productivity (liters per minute);
- volume of the storage tank (if provided);
- Power, W.);
- noise level, dB.
The first two parameters must satisfy the needs of the compressed air consumer that you are going to connect to the unit. Engine power determines the performance of the unit. Too much power reserve will mean wasted energy costs. The volume of the oil compressor reservoir must cover the air flow when the supercharger is periodically turned on for pumping.
The noise level must meet the requirements for sanitary standards for habitable premises. So, for a bedroom, operating room and ultra-precision production, it is 30-32 dB, for residential premises - 35-45 dB.
