What are the characteristics of the three-dimensional flow impeller of RAETTS blower?
The impeller of the traditional blower is a binary flow impeller, that is, the operation of the fluid parameters is determined by the two coordinates of x and y; the ternary flow impeller means that in actual flow, all flow parameters are determined by the x, y, and z coordinates Three-dimensional operation of fluid. If the binary flow is a plane photograph, then the ternary flow is a three-dimensional sculpture. Obviously, the ternary flow design is more in line with the real operating conditions of the fluid, especially for the irregular movement caused by irregular fluids (air, water, etc.) , which can realize all-round description and calculation.
The impellers of air levitation blower and magnetic levitation blower are the first factor that affects efficiency. Generally, the efficiency of ternary flow impellers can be improved by about 5%-10% compared to other impellers. All series of RAETTS air suspension and magnetic suspension blower are equipped with three-dimensional flow impellers, including the heat dissipation impeller part, ensuring high efficiency and energy saving.Dynamic Centrifugal Turbo Blower
Specifically, the characteristics of ternary flow impeller include:
1. The impeller has wider blades and smaller hub, which enhances circulation and effectively improves work efficiency;
2. The diameter of the impeller becomes smaller and the outlet width increases, effectively improving work efficiency;
3. The blade twist is much stronger than that of one-element flow, which is also one of the advantages of this three-element flow blade;
4. The inlet edge of the ternary flow blade extends toward the inlet of the incoming flow, which greatly saves the energy at the inlet;
5. This kind of pump reduces the impact of the intake air and reduces the throw-off of the tail, so that the efficiency can be truly improved.
RAETTS blower impellers are all precision machined by a five-axis CNC machining center. The precision-manufactured impellers have the characteristics of high strength, high aerodynamic efficiency, and low wear. All impellers have been treated with hard oxygen anti-corrosion;
The whole machine adopts a frequency conversion adjustment method, eliminating the guide vane adjustment, the starting current is smaller, the blower has a wider adjustable range, the impeller is directly connected to the shaft, and the power transmission efficiency is 100%. The impeller needs to undergo rigorous bench experiments to ensure that its aerodynamic performance is efficient and reliable. The impeller’s variable efficiency can reach 85%, and it has passed the 115% overspeed test
Why does the impeller of RAETTS blower need to be hard oxidized?
For blower, the impeller is one of the important components. Different blower use different types of impellers. Generally speaking, the impellers of centrifugal blower are much more complex than those of axial flow blower and diagonal flow blower, and have higher technological requirements. In actual operation, the impeller is the area most closely in contact with the air, and is prone to corrosion and other damage. In order to improve the corrosion resistance, wear resistance, weather resistance, insulation and adsorption of the impeller, at the same time, in order to keep the impeller at a higher In order to improve the performance, the finished impeller needs to be hard oxidized, which is a key production process.positive-displacement blowers
The main material of the RAETTS blower impeller is high-grade aviation aluminum. In addition to aluminum, magnesium is also added as the main material. It is an aluminum alloy metal and a by-product of the development of the aviation industry. It was developed by the Academy of Sciences. Become. The full name of hard anodizing of aluminum alloys is hard anodizing. The purpose of hard anodizing of aluminum alloys is to improve various properties of aluminum and aluminum alloys. It is not only suitable for deformed aluminum alloys, but also for press-forged aluminum alloy parts. Aviation aluminum becomes even more powerful after hard oxidation. The insulation and wear resistance of the product are greatly enhanced, and its surface hardness effect is also improved. Therefore, in the machinery industry, some important parts will use aluminum hard oxidation. products instead.Turbo Type Blowers
The hard oxidation treatment method is an electrolytic surface treatment method. The principle is to use electrolyte to partially dissolve the metal surface, and then adjust the potential to react to generate a hard oxide layer to form a protective layer, thereby making the metal The surface corrosion resistance and wear resistance of the material are improved. There are many electrolytic methods for hard anodizing, such as sulfuric acid, oxalic acid, propylene glycol, sulfosalicylic acid and its carbonates and organic acids. Among them, the sulfuric acid method is a widely used hard oxidation method. Common power supplies can be divided into DC, AC, AC-DC superimposed, pulse and superimposed pulse power supplies. Hard anodized films generally require a thickness of 25-150μm, and the thickness of most hard anodized films is 50-80μm.
What are the characteristics of 7075 aviation duralumin used in RAETTS blower impellers?
7075 aviation duralumin is a high-strength cold-processed forged alloy. It is one of the most well-known commercial alloys and is known as the best product among aluminum alloys. It has high strength and is far superior to any mild steel. It is corrosion-resistant and has good corrosion resistance. Mechanical properties and anodic reaction, tool wear resistance is enhanced. 7075 aviation hard aluminum is commonly used in aerospace, mold processing, mechanical equipment, and tooling fixtures. It is especially used to manufacture aircraft structures and other high-stress structures that require high strength and strong corrosion resistance.
(1) Advantages of 7075 aviation duralumin
1. It has relatively high hardness and is very suitable for building aircraft, ships and other parts;
2. The drilling performance is very good, and it is more convenient to grind, cut and build;
3. It has strong wear resistance, is easy to process, has good molding effect and is not easy to deform;
4. It is a high-strength heat-treatable alloy;
5. Has good mechanical properties.
6. Good corrosion resistance and oxidation resistance (the effect is better after hard oxygen treatment);
7. It is a high-strength material that can be used for high-pressure structural parts.
(2) Disadvantages of 7075 aviation duralumin
1. The price is relatively expensive;
2. It cannot be used in most buildings, so the scope of use is limited.
(3) The difference between aviation aluminum and ordinary aluminum
In addition to price and scope of use, the main differences between the two are:
1. Aviation aluminum has strong wear resistance and is often used to design and build aircraft. The standards and requirements are very strict. If you are not careful, there will be personal danger; while the standards of ordinary aluminum will be relatively low;
2. There are specific purchasing channels for aviation aluminum materials, while ordinary aluminum materials can be purchased at most aluminum gold stores.
(4) The difference between aviation aluminum 7075 and 6061
6061 and 7075 are both aluminum alloys and have similar properties, but they are very different.
The main differences between the two include:
1. Different ingredients:
In the 7075 specification aluminum alloy, the main metal elements aluminum and zinc account for 90% and 5.6% respectively, the other elements are magnesium accounting for 2.5%, copper accounting for 1.6%, chromium accounting for 0.23%, and the remainder is Silicon, manganese, titanium… and other metal elements.
In the 6061 specification aluminum alloy, the aluminum alloy element accounts for 97.9%, the magnesium element accounts for 1%, the silicon element accounts for 0.6%, and 0.28% copper and 0.2% chromium (Chromium) are added.
2. Different strengths: 7075 is slightly stronger than 6061;
3. Different prices: 7075 is the lightest but has the highest strength and is also expensive; 6061 is the most common and affordable;
4. Different uses: 6061 can be used for various treatments and has a wider range of uses;
How do the bearings of RAETTS air suspension blower float?
We know that air suspension blowers are mainly composed of impellers, air suspension bearings, high-speed permanent magnet motors, frequency converters and structural control systems. Air bearings (also known as air bearings) refer to sliding bearings that use gas (usually air, but may also be other gases) as lubricant. Air is less viscous than oil, resistant to high temperatures, and non-polluting, so it can be used in high-speed machines, instruments and radioactive devices, but its load capacity is lower than that of oil.
The main shaft of the motor and the impeller of the blower are coaxial, and the high-speed rotor system is directly supported by air suspension bearings. The so-called air suspension blower refers to a type of blower in which when the blower rotor rotates at high speed, the air will produce a dynamic pressure effect between the rotor and the foil bearing surface, forming a high-pressure air film to float the rotor!
Air suspension bearings use air as the working medium, elastic flat foils as the supporting surface, and elastic corrugated foils as the supporting components. Initially, the impeller rotor naturally falls into the bottom of the bearing under the action of gravity, but when the rotor rotates at high speed, a dynamic pressure effect occurs between the planes due to the viscosity of the air and the action of the wedges. The flat and corrugated foils are elastically deformed on the foil and rotor surfaces, pushing the flat foils apart and leaving the rotor in a suspended state. Uneven circumferential air pressure gives foil bearings the ability to withstand loads. During the high-speed rotation of the rotor, a high-pressure air film forms between the rotor and the foil, causing the rotor to levitate.
Although the impeller rotor has no friction after the air suspension blower operates normally, this does not mean that the equipment is completely friction-free during the entire process. During the starting and stopping phases of the foil bearing, when the speed is lower than the critical speed, the dynamic pressure effect is not enough to fix the rotor. At this time, there will still be contact friction between the inner surface of the bearing and the rotor. This time is short, but still has flat foil. The wear problem of the membrane will shorten the service life, so when using the air suspension blower, frequent start and stop operations must be minimized. At the same time, in order to increase the service life of dynamic pressure bearings, a high-quality lubricating coating must be applied to the bearing surface.
Why does RAETTS air suspension blower need to be equipped with a frequency converter?
The air suspension blower is a single-stage centrifugal blower, which is composed of an air suspension motor, bearings, frequency converter and control system. The air-floating blower abandons the gearbox speed increaser, coupling and lubrication system of the traditional centrifugal blower, and is directly driven by a high-speed permanent magnet motor. The motor uses a frequency converter for speed regulation. The blower impeller is directly combined with the motor, and the shaft is suspended on the active on the air bearing.
There is a question, why does the air suspension blower use a frequency converter to control the motor?
First, let’s look at what would happen if the air suspension blower does not use a frequency converter? If the frequency converter is not configured, the blower needs to be started by reducing the voltage when starting. After the blower runs normally, the motor starts running again and drives the impeller to generate air volume. The air volume is adjusted according to the damper. If the blower does not have an inverter, the blower motor can only operate at full load. At this time, the blower motor cannot change speed, which will cause the blower’s working efficiency to become low and the phenomenon of a big horse pulling a small cart.
The air suspension blower can be adjusted at variable speed after using a frequency converter. Compared with the general speed adjustment method using a frequency converter, the frequency converter speed adjustment has obvious advantages over the general speed adjustment method.
(1) Low operating speed and high speed;
(2) The current control is very stable and will not cause vibration of the blower bearings or affect the air suspension system;
(3) Non-stop function after instantaneous power outage to avoid abnormal shutdown caused by lightning strikes or unstable power grid;
(4) Good communication function to facilitate information exchange with the entire blower control system;
(5) High carrier frequency, good heat dissipation, and protection of key components;
Therefore, the use of frequency converters for air suspension blower can effectively reduce the loss of useless work, and can also adjust the voltage according to the load condition of the air suspension blower. Moreover, the frequency converter uses soft start, and there is no large current when starting the air suspension blower, which can effectively save energy and reduce operating costs.
Why air suspension blower do not need to be maintained with lubricating oil
During the use of traditional RAETTS blowers and multi-stage centrifugal blowers, since they are gear speed-increasing blowers and use mechanical bearings, the gear bearings need to be lubricated regularly and lubricating oil is required.
For air suspension blower using new suspension bearings, due to their special structure and design, they perfectly avoid gearless speed-increasing systems and oil-free station systems, ensuring the output of clean air and meeting the aeration needs of many industries.
Air suspension bearings mainly include radial bearings, thrust bearings and other components. There is physical contact between the rotary shaft and the bearing before starting. During startup, the rotary shaft and the bearing move relative to each other to form a hydrodynamic field. This hydrodynamic force forms a buoyancy force in the radial bearing. This buoyancy force keeps the rotary shaft in a suspended state to achieve the purpose of free rotation. air foil bearing blower
To put it figuratively, an air suspension blower is a type of blower in which the air rotates at high speed of the blower rotor, which will produce a dynamic pressure effect between the rotor and the foil bearing surface, forming a high-pressure air film to float the rotor. Since there is no physical contact between the rotor and the bearing during high-speed operation, there is no mechanical friction, so there is no need for lubricating oil, and it can also be understood that air is the lubricant.
Air suspension bearings are different from traditional ball bearings. There is no physical contact point between the rotary shaft and the bearing during operation, so no lubricating oil is required. The energy loss is extremely low and the efficiency is extremely high. The maximum speed can reach 30,000-50,000 rpm.
Precisely because the air suspension blower is an oil-free device, it does not need to use lubricating oil or grease. While saving a lot of maintenance costs, it has a low failure rate and a longer life, creating more profits for the company. and value.
Precautions for installing RAETTS blower
After the RAETTS air suspension blower arrives at the customer’s project site, it needs to be installed. When installing an air suspension blower, in order to ensure that the blower performs its intended function and ensures the installation quality, it is necessary to strictly follow the operating instructions and the operating guidance of RAETTS professionals. At the same time, some easily overlooked details on site must be considered to ensure that the installation is in place. ,Operating normally.
Things to note when installing RAETTS air suspension blower include:
1. Temperature and humidity factors: Theoretically, the blower should be installed in a building that is not affected by the climate, has good lighting, and is free of dust and dust. Dusty places will shorten the service life of the filter. High humidity can cause electrical/electronic parts to malfunction; air bearing blower
2. Installation location: The location should be away from fire sources, power sources, pollution sources, chimneys, cooling towers, steam or high-temperature gas outlets, etc., and should be installed in a place that is not affected by high temperature, moisture, dust and other pollution sources;
3. Avoid mixing other types of blower in the computer room: When there are multiple RAETTS blowers, multi-stage centrifugal blower and other traditional blowers in the same computer room, oil pollution and temperature cycle overheating will occur. It is recommended that oil-free air suspension blower be installed separately or away from traditional blowers. blower; choose to install it in a well-ventilated place. If it needs to be installed in a closed room, in order to dissipate heat, be sure to install a ventilation device indoors.
4. Outdoor installation: Be careful not to be affected by storms, rain and snow; not be affected by a large amount of dust and dirt; and not be subject to human damage;
5. Reserve space: For the later disassembly, assembly and maintenance of the blower, a certain amount of space should be reserved around the installation location to facilitate subsequent operations;
6. Installation on the second floor and above or installation on underground floors: It is necessary to ensure that the equipment can be easily moved up and down the elevator or up and down to facilitate maintenance and operation of the equipment; it is necessary to consider whether there is resonance on the ground and resonance standard settings; centrifugal air suspension blower
7. Do a good job of horizontal adjustment: If the installation ground is uneven, you need to perform ground level construction. When installing the equipment, you need to adjust the equipment support feet so that they do not move eccentrically and remain stable to ensure that the ground can withstand the static load and load of the equipment. Dynamic load.
The difference between air floating blower and RAETTS blower
We know that the main structure of the RAETTS blower is the head, motor, base and some major spare parts. The main structure of the air suspension blower is: volute, permanent magnet motor, and air suspension bearing.
The RAETTS blower is a positive displacement blower, and the air vortex blower is a centrifugal blower. There is a big difference in the working principles between the two. When the RAETTS blower is running, it will overcome a certain pressure and forcefully transport gas. This is its main purpose. characteristics and also its advantages. The air suspension blower is a centrifugal blower. When running, it can transport a large air volume of gas. The characteristics of the whole machine are in line with the characteristics of the centrifugal blower. The air transportation volume is large. One air suspension blower can replace multiple identical ones. Parameters of RAETTS Blower. Heavy Duty Industrial Air Blower
The main differences between the two include:
1. Motor
The air suspension blower can use an ordinary motor, and then adjust the speed through gear increase, or it can use the permanent magnet motor of our East China blower products to adjust the speed. Ordinary RAETTS blowers use commonly used motors, which have low working efficiency and large losses. Maglev Turbo Blower
2. Bearings
Air suspension blower use air bearings, which require no lubricating oil and are easy to maintain; RAETTS blowers use common ball bearings (speed-increasing bearings), which require lubricating oil. The service life of the two is very different. One is semi-permanent and the other has a certain service life. Ordinary gears increase speed and the bearings will rub against each other during operation. The bearings of the air suspension blower have a small amount of friction before taking off. After the bearings take off, there is no mechanical friction, so the service life is longer.
3. Pressure air volume
The output pressure of RAETTS blower is usually 0.1-1.2kgf/cm2, and the air volume range is between 0.5-100m3/min; while the output pressure of air suspension blower is usually 5-10kgf/cm2, and the air volume range is between 10-500m3/min. Air suspension blower are all controlled by variable frequency. RAETTS blowers can be fixed frequency or variable frequency.
4. Control aspect
The air suspension blower can be controlled remotely, while the RAETTS blower can only be controlled manually on site, which is far less convenient than the air suspension blower.Highspeed Turbo Blower
5. Volume weight
The air suspension blower is small in size and highly integrated. Because the RAETTS blower uses a traditional motor and the head part, the structure of the RAETTS blower occupies a larger area than that of the air suspension blower.
Most air flotation materials are made of aviation aluminum or titanium alloy, while the castings used in RAETTS blowers are all made of cast iron. The weight of the two is very different. Air suspension centrifugal blower
6. Accessories
Due to its high integration level, the air suspension blower has few accessories, while the RAETTS blower needs to be equipped with some accessories, such as belts, gearboxes, etc., to maintain smooth operation of the whole machine.
7. Work efficiency
Due to the low friction and high speed of the air suspension blower, one piece of equipment can replace multiple RAETTS blowers, and the work efficiency is higher.
8. Vibration reduction facilities
Air suspension blower are basically vibration-free and do not require vibration reduction measures, while RAETTS blowers have relatively large vibrations and require necessary vibration reduction measures.
9. Later maintenance
The air suspension blower is a semi-permanent product and can be used for more than 15 years. The service life of the RAETTS blower is about 5-10 years, and it requires a lot of maintenance work.
10. Installation
The air suspension blower can be used directly on the ground, while the RAETTS blower needs to be installed on a certain foundation and designed according to specific drawings.
11. Noise
The air suspension blower has a centrifugal working principle and the noise is less than 80 decibels. The RAETTS blower is a rotary blower and has higher noise.TURBO BLOWER AND COMPRESSOR
12. Price
RAETTS blowers belong to the technology of the last century. The production technology is mature. There are many manufacturers and models. The products are mainly made of cast iron and the price is relatively affordable. However, because the product has mechanical friction, its service life is mostly 5 to 8 years. Air suspension blower use air bearings, which have low friction. Most of the entire machine is made of aviation aluminum. The purchase cost is relatively high, but its service life is long.
What are the requirements for the installation environment of air suspension blowers?
Air suspension blower are important blasting and aeration equipment widely used in environmental protection enterprises such as sewage treatment. They are also the preferred product to replace RAETTS blowers and multi-stage centrifugal blower in recent years. When installing an air suspension blower, in order to ensure correct installation, ensure product quality, and achieve the correct purpose of blowing and aeration, you need to follow the correct installation procedures and pay attention to some details.
1. Temperature environment
The operating environment of air suspension blowers is generally between -10°C and -45°C. If the temperature is lower than -10°C, a heating system needs to be installed in the machine room (especially in the northern region). If the temperature exceeds 45°C, the machine room needs to be ventilated to reduce the temperature. Ambient temperature to avoid excessive temperature;
2. Altitude factor
When the air suspension blower is used in high-altitude areas, it is necessary to install a selection curve to make the selection for that altitude. The higher the altitude, the lower the air pressure, and the synchronization needs to match reasonable parameters;
3. Indoor and outdoor
Air suspension blowers are generally installed indoors. If they need to be installed outdoors in a few cases, you need to consider potential safety hazards that may arise outdoors such as dustproof, fireproof, anti-theft, windproof, and rainproof;
4. Reserve space
Generally, in order to facilitate inspection and subsequent maintenance, the blower needs to be placed at least 1m away from the wall or adjacent equipment;
5. Avoid corrosion
Generally speaking, avoid installing ground blower in places with high salt content, corrosive gases, dust and sand, and flammable and explosive gases. If the blower is exposed to the above environment for a long time, the impeller and bearings will be corroded or worn prematurely; the installation location should be away from pollution sources and chimneys, cooling towers, steam, or high-temperature gas outlets, etc., and should be installed in a location that is not subject to high temperatures. Places affected by moisture, dust and other pollution sources.
6. Moisture-proof and waterproof
blower should avoid installation or exposure to rain, snow or moisture, as excessive moisture may cause leakage or corrosion of moving parts. Stay away from environments with high air humidity;
7. Keep away from flammable and explosive environments
Do not install in flammable or explosive locations.
8. Avoid using other blowers such as RAETTS blowers and multi-stage blowers and air suspension blower in the same space. This will cause the equipment to be affected by overheating, oil pollution, etc., so it must be installed separately.
9. If the installation ground is uneven, foundation construction is required. The bottom static load and dynamic load must be considered in advance at the installation site to ensure the stability of the blower during use;
The main mechanical components of the RAETTS floating blower
1. Air suspension bearing
When starting, the rotary shaft rotates along the bearing. When reaching high-speed operation, an air film force is formed around the circumference, which realizes the rotary shaft is suspended, separated from mechanical contact, and friction-free. Therefore, the core technology of the air-floating blower is the air-floating bearing. The bearing does not require lubricating oil. Bearings are one of the key components;
2. Three-dimensional flow impeller
The impeller is developed and designed based on the ternary flow theory. It is made of aviation aluminum alloy and processed by Hammer five-axis CNC. The blades are more efficient and have a wider adjustable range, which improves the overall blower performance;
3. High-speed permanent magnet synchronous motor
Equipped with a permanent magnet brushless high-speed motor, the efficiency can reach 97%. The motor is equipped with a digital control speed regulating device, and the system control integration is simple. High speed, no vibration, low noise, high efficiency and energy saving, small electromagnetic radiation, it is the current popular energy-saving green and environmentally friendly motor;
4. Advanced cooling system
Unique air cooling technology, the cooling fin material uses aluminum alloy (AL) with very strong thermal conductivity, no additional energy loss and simple structure;
5. High-efficiency frequency converter and PLC control system
RAETTS blowers are highly integrated, modularly designed and assembled, integrating local control and frequency conversion systems into one, eliminating the need for frequency conversion cabinets and operation cabinets. Through the blower PLC system, the flow, pressure, temperature, current, voltage and other parameters can be sensed and controlled more accurately and unmanned on duty can be achieved;
6. Overall noise reduction technology
The internal air outlet bypass pipe of the blower is equipped with a vent valve and a silencer. Its shell is made of carbon steel and has sound-absorbing filter material inside. The blower adopts a pneumatic vent valve in the body, which can ensure that the blower can be shut down safely without any impact in case of power outage or abnormal conditions, and is beautiful and elegant.
7. Efficient and durable soft connection
The blower soft connection is a flexible connection accessory between the blower inlet and the blower outlet. It is used for blower noise reduction and thermal compensation for blower pipe deformation. RAETTS blower soft connection is suitable for all types of air duct and duct designs to meet the needs of various working conditions.
