What is the main function of the rotary blower speed?

 The moment the exhaust port is connected to the exhaust port nearby, there will be a high-pressure gas backflow, which will increase the pressure in the working volume and ultimately transport the gas to the exhaust channel. Each concave curved surface part and the inner wall of the cylinder on the rotary blower will form the working volume, and during the rotor's reversal process, gas will be drawn from the intake port. The gas in the pump chamber will not undergo compression or expansion. When the top of the rotor reaches the edge of the exhaust port, the space will connect with the exhaust side, changing the fully enclosed state. When the gas pressure on the exhaust side is higher, some gas will backflow into the space between the rotor and the pump casing, thus increasing the gas pressure. As the rotor continues to roll, the gas will be discharged. The rotary blower operates by continuously rotating the rotor, drawing gas from the intake port into the space between the rotor and the pump casing, and then discharging it through the exhaust port. After inhalation, the space between the rotor and the pump casing is in a fully enclosed state. The oil seals of rotary blowers are mostly made of fluororubber material, as this material has the advantages of high temperature resistance, wear resistance, and long service life. Since it belongs to a constant torque load, the power saving rate is proportional to the reduction in speed, which has the advantages of high efficiency and high power saving rate. Moreover, as long as the furnace wall is intact, it can operate continuously for 24 hours, and the startup time is also very long.

2022-03-21

What are the functions of selecting Roots blowers for power plants?

The special curve of the impeller selection makes the engagement more reasonable, with less leakage, high efficiency, and low energy consumption, making it a new type of energy-saving and environmentally friendly product; it has a long service life and low noise; it transports gas cleanly, without any oily dust. Large and medium-sized thermal power plants use three-lobe Roots blowers, mainly for 300,000 kilowatt thermal power generating units, selecting negative pressure ash removal in the ash hopper gasification Roots blower and ash storage gasification Roots blower, which lifts the ash and enhances its fluidity. The three-lobe Roots blower is widely used in power companies for desulfurization and denitrification in power plants. During the pneumatic ash conveying process in power plants, it will come into contact with corrosive gases such as sulfuric acid, which can cause corrosion to the Roots blower. This type of Roots blower delivers air steadily, with small flow changes, and the special curve of the impeller selection makes the engagement more reasonable, with less leakage, high efficiency, and low energy consumption, making it a new type of energy-saving and environmentally friendly product.

2022-03-14

How can we improve the shock absorption of the Roots blower?

1. When the Roots blower is installed indoors or on the roof, the noise generated by mechanical vibrations and high-speed airflow during operation can affect the surrounding environment and even cause harm to humans, so vibration reduction measures are necessary. 2. Vibration dampers are generally installed under the vibration reduction plate or under the fabricated steel support of the blower. The vibration reduction plate is a prefabricated reinforced concrete slab, designed to allow multiple vibration dampers installed beneath the plate to bear loads evenly. The number of vibration dampers should be determined based on the airflow size of the Roots blower, and it should generally not be less than four. 3. When the vibration dampers are installed under the vibration reduction plate, they should be positioned at the center of the reserved holes without deviation. The surface on the ground or foundation should be kept flat to ensure that the vibration dampers bear loads evenly. Spring vibration dampers have the characteristics of high resistance and low frequency, which are effective in eliminating external impact vibrations.

2022-03-14

What problems are there with the Roots blower during maintenance?

 1. Ensure the smooth operation of the Roots blower and pipelines.        During maintenance of the Roots blower, a dust removal inspection must be conducted on the components of the intake pipeline; the dust and oil sludge inside the casing must be cleaned out; check whether the outlet components and pipelines are unobstructed.        2. Ensure the safety valve is flexible.        Since the Roots blower is a positive displacement blower, if ventilation is poor, the pressure will continue to rise until the motor stalls or the casing is damaged. If the safety valve opens naturally at the rated pressure or at the allowable set pressure, the above failures can be avoided; thus, both equipment and personal safety can be ensured.        3. Ensure the three clearances of the Roots blower.        The three clearances of the Roots blower refer to the radial clearance between the rotor and the casing, the clearance between the rotors, and the clearance between the rotor side and the casing wall.        4. Accurate pin positioning.        There are three locations in the Roots blower that must be accurately positioned; otherwise, it will affect the operation of the blower. The pins of the upper and lower casings and the pins of the gearbox are generally not replaced during maintenance, so they only need to be installed correctly during repairs.

2022-03-11

Common Fault Problems of Roots Blowers

The gap between the fan rotor's blades and the blade tips is not suitable, and the gap changes during operation. If this fault occurs during operation, it can cause collisions between the two rotors or between the rotor and the casing, resulting in a strong impact sound; vibrations increase, which can even lead to foundation vibrations; at the same time, the temperature at the friction points rises rapidly, and the casing may even become red hot. Damage to the fan's bearings, poor operating conditions, damaged oil seals, and excessive assembly gaps can all lead to bearing damage, which causes temperature increases, and the temperature of the bearing housing will also rise, potentially leading to deformation of the bearing housing. Gear wear in the fan can increase the side gap of the gears, causing changes in the positions of the two rotors, leading to mutual collisions and friction. If the rotor or casing is deformed, it can cause the gap between the rotor's outer diameter and the casing to become too small, resulting in rotor friction and jamming. If the gap between the rotor end face and the side cover plate is too small, debris can get squeezed into the gap between the rotor and the side cover plate, causing friction and jamming of the rotor.

2022-03-11

What to do if the high-pressure Roots blower cannot be started?

 High-pressure Roots blowers generally have no issues when starting. If there is a failure to start, what could be the cause? Today, let's explore this. Confirm the power supply connection of the high-pressure Roots blower. Check that the external circuit of the high-pressure Roots blower is intact for power supply and control lines. Inspect for incorrect electrical wire connections according to the nameplate. Ensure that the metal connections are good. If the motor connection plug on the terminal block is loose, reconnect it according to the wiring nameplate instructions. If there is a disconnection in the connection line of the high-pressure Roots blower, contact the after-sales department; do not disassemble the motor for inspection without permission. Disconnection of the capacitor wiring or damage to the capacitor can lead to disconnection of the internal winding of the motor. ① The biting area of the Roots blower is too large. Generally, the normal biting area of the impeller of the Roots blower is about 2/3. If it exceeds this biting area, it will cause excessive biting force between the gears, leading to a failure of the blower to rotate.  ② Rust condition of the Roots blower  With prolonged use, if the Roots blower is not maintained properly, or if the medium being transported has a high moisture content, it can easily cause rust on the inner wall of the blower. In severe cases, the impeller and the wall or casing may rust together, or large areas may flake off due to rust, causing the impellers to jam. At this point, measures such as kerosene soaking or gasoline washing can be used to treat the rust, followed by readjusting the gap.  ③ Foreign objects in the Roots blower  During the operation of the Roots blower, if large particles are present in the transported medium, they can easily block parts of the cavity, preventing the blower equipment from rotating. At this time, we need to remove foreign objects from the blower cavity, check the gap between the impellers, and also check where the foreign objects have fallen to prevent the failure from occurring again.  ④ Damage to the impeller of the Roots blower  If the impeller of the Roots blower is damaged, it can cause the impellers to bite against each other and not rotate, leading to the blower not being able to turn. In this case, we should recheck.  ⑤ Damage to the bearings of the Roots blower.  When the bearings of the Roots blower are damaged, it can easily cause changes in the internal gaps of the blower, leading to impeller friction. In severe cases, it can prevent the blower from rotating, which is an indirect cause of the change in blower gaps and a common reason for the blower not being able to rotate.  ⑥ Deformation of parts of the Roots blower.  If this phenomenon occurs, it is often due to the poor quality of the purchased parts. Some blower equipment manufacturers excessively reduce costs, leading to substandard component strength. Different prices for the same model may indicate issues such as thickness of castings and overly thin shaft necks. Additionally, if the Roots blower equipment is left unused for a long time, it can also cause some deformation of the parts.  ⑦ Damage to the motor of the Roots blower.  When the motor of equipment that has been idle for a long time fails, the blower cannot rotate. At this point, we should check the motor and eliminate the fault.  

2022-03-08

How to choose an environmentally friendly Roots blower?

Roots blowers have great adaptability and are widely used, thus classified under the category of general machinery. Their assembly and usage conditions are relatively simple, but the usage methods of Roots blowers vary across different industries.     (1) Wastewater Treatment     Municipal wastewater projects and domestic sewage, which we commonly refer to as widely distributed wastewater treatment plants, primarily use Roots blowers for aeration and oxygen supply. Their main purpose is to provide oxygen and flow to the biochemical reaction tanks, ensuring the normal survival of microbial species, which helps remove harmful and reactive substances from the wastewater through these microorganisms, creating a good environment for subsequent sedimentation and other treatments. Roots blowers typically supply dozens or even hundreds of tanks through main pipelines, so they generally require a large flow rate and long operating times, imposing strict operational requirements on the Roots blowers themselves.     Due to the structural issues of Roots blowers, they tend to produce significant noise. Many water treatment systems are usually indoors or in urban areas, leading to frequent replacements of Roots blowers by such users. However, in suburban areas and water treatment projects with good noise control, the use of Roots blowers remains quite common. This is because Roots blowers, compared to other types of oxygen supply blowers, have the advantages of large flow rates and stable gas supply, making them suitable for such systems.     (3) Desulfurization and Denitrification     Flue gas treatment, desulfurization, denitrification, and dust removal systems in power plants are commonly used. Desulfurization and denitrification can be simply described as the process of neutralizing acids with bases. Desulfurization involves removing sulfur dioxide from boiler flue gas through a lack of supply, while denitrification involves removing nitrogen oxides from boiler flue gas. The usage characteristics of this type of Roots blower include large scale, large models, and high pressure, so when selecting models, large flow and high pressure, models above 200, bipolar series, and high-pressure water cooling become the best choices for users. (4) Pneumatic Conveying     Pneumatic conveying, also known as air flow conveying, utilizes the energy of air flow to transport granular materials along the direction of the air flow in closed pipelines. It is a specific application of fluidization technology. The structure of pneumatic conveying devices is simple, and they are easy to operate, capable of horizontal, vertical, or inclined conveying. During the conveying process, physical operations such as heating, cooling, drying, and air flow classification, or certain chemical operations can also be performed simultaneously.

2022-03-08

How much do you know about the wear of Roots blower parts?

The wear process of the blower parts varies greatly due to differences in friction, environmental conditions, and surface contact conditions. 1. The initial stage of wear is the early stage of material wear, where the unevenness of the blower parts and the oxidation layer, decarburization layer, are quickly worn down due to the frictional forces acting on the Roots blower parts during operation. The Roots blower operates without friction in the impeller within the body, requiring no lubrication, which ensures that the discharged gas is oil-free. It is an ideal pneumatic conveying gas source for industries such as chemicals and food. At this time, the equipment can demonstrate a high production efficiency.   The normal wear stage is the intermediate stage of material wear. Generally, the wear degree of the Roots blower parts increases uniformly and slowly over time. Therefore, productivity and processing quality will improve, making this stage longer.   3. The rapid wear stage is the most vulnerable stage, where the normal wear relationship has been disrupted, leading to a sharp increase in wear, which subsequently causes damage to the stainless steel blower parts and equipment downtime. The Roots blower is a positive displacement blower. During use, as pressure changes, the flow variation is also small. Therefore, the selection range for pressure is wide, and the flow can be adjusted by selecting the rotational speed as needed. The Roots blower operates without friction in the impeller within the body, requiring no lubrication, which ensures that the discharged gas is oil-free. It is an ideal pneumatic conveying gas source for industries such as chemicals and food. However, prior to this, the precision, performance, and productivity of the equipment have significantly decreased. Therefore, it is generally not allowed for Roots blower parts to reach the severe wear stage. Repairs or replacements should be made when the Roots blower parts approach the later stage of normal wear, as this stage is also relatively short.

2022-03-08

Can rotary fans be used in aquaculture? After reading these points, you'll know the answer, it's true and reliable!

Can rotary blowers be used in aquaculture? Let's analyze whether rotary blowers can be used in aquaculture, the answer is no, because the gas discharged by rotary blowers contains trace amounts of hydraulic oil, rather than clean air, so it cannot be used in aquaculture as it will pollute the water quality of the ponds.   1. Why does the air from the rotary blower contain oil? What is the principle?   The base of the rotary blower also serves as a reservoir for lubricating oil, utilizing the pressure difference between the blower's intake and exhaust. Necessary lubricating oil is dripped into the cylinder from the oil drip nozzle, which lubricates the friction surfaces and forms a layer of oil film separating the components from the air, and finally returns to the base oil tank. The main body of the blower has an oil pipe connected to the oil tank, and when the internal eccentric operation of the blower occurs, negative pressure is generated, which draws hydraulic oil into the main body, mixing air and oil. Through compression and exhaust, the mixed gas passes through the oil-gas separator at the front end, separating air and oil, but the discharged air still contains trace amounts of oil, so it is not recommended for aquaculture oxygenation. The daily inspection standards for the rotary system are as follows:   Check whether the oil in the oil tank meets the standard before starting (there are marked lines on the oil dipstick). If the oil is insufficient, please add oil. Observe whether there are oil droplets coming from the oil drip nozzle (adjust the lubricating oil to control at 15-20 drops per minute), and check whether there is oil flowing in the transparent oil pipe. Regularly check whether the dripping condition of the oil drip nozzle is normal; if the oil drip nozzle is dirty, it can be removed and cleaned with an adjusting screw. 3. Exhaust capacity of the rotary blower   The exhaust capacity of the rotary blower is about 0.28-5.2 cubic meters, which is a bit small for large-scale aquaculture, so it is not recommended for use.  

2022-03-07

The three important components of Roots blower accessories

When purchasing a Roots blower, you can refer to the following information to have a certain understanding of the accessories of the Roots blower. Below are the components of the Roots blower's accessories. The main accessories of the Roots blower include: motor, casing, silencer, bearings, casing, check valve, pressure gauge, flange, pressure relief valve, gate valve, belt, lubricating oil, base, soundproof cover, filter element, anchor bolts, oil tank, coupling, etc. The following three parts are particularly important and deserve your attention: 1: Blower Bearings Bearings should be chosen for their durability. High-brand bearings will affect the sturdiness of the blower and its lifespan. 2: Blower Gears The power transmission of the blower relies on the gears. If the gears are not regularly maintained and lubricating oil is not added, it will also affect the lifespan of the blower. 3: Blower Impeller There is a gap between the impellers. You must regularly clean the oil and debris to prevent damage and jamming of the impeller.   The above is a brief analysis of the accessories of the Roots blower by the editor of Mingfeng Machinery, hoping to be helpful to everyone.

2022-02-25