Mingfeng Roots blower manufacturer analyzes the reasons for insufficient gas volume of Roots vacuum pumps.

The Roots vacuum pump does not have enough gas volume, and the occurrence of this fault prevents the pump from fully exerting its efficiency and meeting process requirements. The possible causes of this fault may be: insufficient pump speed; poor sealing, air leakage at the intake pipeline or shaft seal connection; excessive clearance between the rotor and rotor, between the rotor outer ring and the pump casing, and between the rotor end face and the end cover circumference.

2023-02-18

What are the characteristics of the three-lobe Roots blower for meltblown fabric machines?

1. Mingfeng Machinery's constant volume fan has no internal compression, and the gas delivery is forced, with very little change in flow as pressure varies. 2. The Roots blower product uses a three-blade linear impeller, with smooth intake and exhaust pulsation, and low noise.

2023-02-14

How to effectively change the lubricating oil in a rotary fan?

The Mingfeng series rotary blowers can be divided into two types based on the different models of the rotary blowers and the different positions of their oil tanks. One is when the oil tank is located on the rotary blower, and the other is when the oil tank is located at the bottom of the rotary blower's air storage tank. Follow the two steps below. 1. The method for handling waste oil from the oil tank is divided into the following two types based on the different positions of the rotary blower's oil tank. 1. If the oil tank is located at the bottom of the fan. First, use a wrench to remove the oil label from the oil filling port (on the oil filling port of the fan base), then remove the oil filter, tilt the fan base, and drain the waste oil from the oil tank as much as possible from the drain port. 2. If the oil tank is located at the bottom of the fan's air storage tank. First, use a wrench to remove the nut from the oil filling port (at the oil filling port at the bottom of the air storage tank), then remove the oil filter, and unscrew the drain port at the bottom of the air storage tank to drain the waste oil from the oil tank. 2. The operation method for refilling the oil tank, based on the different positions of the oil tank, is also divided into the following two types. 1. If the oil tank is located at the base of the rotary blower, after completing the above two steps, install the oil filter and return pipe that have been cleaned with the cleaning liquid, and inject lubricating oil (No. 68 wear-resistant hydraulic oil) into the oil tank. Fill the oil tank to about 3/4, do not exceed the oil gauge scale line, and then tighten the oil gauge. Be careful to tighten with a wrench to avoid air and oil leaks from the fan's oil tank. 2. If the oil tank is at the bottom of the rotary blower's air storage tank, after completing the above two steps, install the oil filter and return pipe, and then refill the oil tank with lubricating oil (No. 68 wear-resistant hydraulic oil). The filling position must not exceed the center of the oil observation window, that is, the red dot of the observation window. Tighten the filling nut again, being careful with the wrench to avoid oil and air leaks from the fan. Precautions for changing the oil of the rotary blower: If the lubricating oil of the rotary blower bearing is used normally, it should be changed at least once every six months. The first use should run for about 200 hours, and the second oil change should be done in 1 to 2 months. After that, the lubricating oil should be checked once a week. For example, if the lubricating oil has not deteriorated, the oil change can be extended to 2 to 4 months, and the specified standard grade lubricating oil should be used for the change. When changing oil, first empty the oil in the oil tank, and then inject new oil. It is best not to add on top of the old oil. If used for a long time, the oil in the tank may become too dirty and thick, affecting the operation of the rotary blower. When checking daily, also pay attention to the oil level position. If the oil level is found to be below half, it should be replenished in time. If the rotary blower is long-term lacking oil, the motor may burn out in severe cases.

2022-08-18

Why choose a Roots blower for aeration fans? The analysis is as follows.

The device structure is simple. The principle of the Roots blower equipment is relatively simple, without complex mechanical structures. It does not have high technical barriers like multi-stage centrifugal or other types of blowers. The more complex the mechanical structure, the more complicated the maintenance process will be.

2022-08-13

Precautions for Changing Lubricating Oil of Roots Blower

In normal circumstances, after about 200 hours of operation of the Roots blower, the first oil and grease change should be done, and the second change should be done after one month of operation. After that, changes should be made according to the usage environment and the quality of the oil (grease). It is recommended to change every three months; if the oil temperature exceeds 50 degrees, it is advisable to change once a month. You can also switch to CKC--N320 medium load industrial gear oil. After the Roots blower is put into operation, it is recommended to change all the lubricating oil after 8 hours of operation. What precautions should be taken? The first step is to remove the gear oil, followed by injecting new gear oil. The first change: after one month of operation, the second change after three months, and for long-term operation, change every six months. Pay attention to the oil level regularly and replenish in time.

2022-08-09

The impact of Roots blowers and their cooling and maintenance in winter

Generally, we have soundproofing equipment for Roots blowers. In summer, we open the soundproof cover door. The soundproof cover creates a limited space, which increases the ambient temperature, leading to a higher temperature of the inhaled air and a higher outlet temperature. Many Roots blowers with soundproofing have an inlet temperature exceeding 45 degrees in summer.

2022-08-06

What are the requirements of the Roots blower for the motor?

1. Parameter: Pressure. The essential parameter for selecting a Roots blower is pressure. 2. Parameter: Airflow. The airflow parameter is another indicator for selecting a Roots blower. With the pressure and airflow parameters, the selection can basically be made, and the basic model of the blower can be determined. Therefore, the above two parameters, pressure and airflow, are essential parameters to know. 3. Parameter: Motor Power. The motor power is a corresponding parameter. If the blower is determined based on pressure and airflow, then the motor power is also basically determined. This is specified in the standard selection sample and is not arbitrarily changed. Of course, JinGong Blower does not exclude customers using non-standard motors, where the motor power may vary, but it can drive the blower head to work. However, there may be some shortcomings in energy saving or other aspects. 4. Parameter: Speed. Some customers have requirements for the speed of the Roots blower. In some technical agreements, we have seen many customers have certain requirements for the blower's speed. The speed of the blower affects the airflow. Why is there a requirement for speed? Besides industry-related reasons, although different speeds can meet the same working conditions, we should try to choose a matching speed. The higher the speed, the faster the wear of the blower, and the shorter the service life. 5. Parameter: Noise Level. This parameter is mainly for specific users. Some users have various parameters, but they often emphasize this parameter, the noise level, when purchasing blowers. For example: hospitals. Hospitals purchase Roots blowers mainly for water treatment. As everyone knows, patients need a quiet environment, so the noise level becomes very important. 6. Parameter: Structural Form. This parameter mainly depends on the customer's choice. Some customers can only choose a compact Roots blower due to space constraints, which can save more space. Some friends may not understand this, but those who commonly use Roots blowers are very familiar with it. The choice of some blower structural forms depends on airflow and pressure. If the pressure is too high, a double-stage series form should be selected. If the airflow is large, a two-lobe Roots blower can be chosen; it is not only the three-lobe form that can be selected. 7. Parameter: Brand. Many dealer customers choose specified brand blowers, so sometimes the brand also becomes a selection parameter. If you contact us through other brands online, please inform us in advance if you need a specified brand. For specified brands, we can only provide you with a quotation plan for the same model of JinGong Blower to facilitate your price comparison. 8. Parameter: Special Requirements. Special requirements can also affect our selection. For example, transporting biogas, coal gas, and other special gases requires special sealing. Therefore, if you are transporting such gases, the Roots blower will have certain differences in manufacturing, and there will be some small differences in sealing methods.

2022-07-04

What causes the Roots blower to trip?

In summer, due to the hot weather and frequent thunderstorms, the Roots blower often experiences tripping situations. In fact, there are many reasons for the tripping of the Roots blower, not just temperature factors. Today, we will analyze the reasons that lead to the tripping and power protection of the fan. 1. Thunderstorms or the startup of large equipment can cause fluctuations in the power grid voltage, which may lead to the frequency converter's under-voltage protection tripping. 2. Due to long periods of neglect in maintenance and cleaning, excessive dust accumulation on the internal boards of the frequency converter or on the heat sink reduces the machine's cooling efficiency, causing the frequency converter to trip due to protective measures. 3. Excessive dust and debris accumulation inside the Roots blower, not cleaned in time, reduces the gaps between rotors and between the rotor and the chamber, thereby increasing load resistance, which causes the motor and frequency converter to be overloaded, leading to machine tripping protection. 4. When selecting the frequency converter, the chosen model capacity is too small. Generally, the capacity of the frequency converter should be about 20% larger than the rated power of the motor to ensure that when the motor reaches full load, the frequency converter can still drive it. 5. Power supply voltage that is too high or too low can cause the frequency converter to overheat and trip for protection. If the power supply voltage exceeds 410 volts, it will increase the internal heat generation of the frequency converter, leading to tripping protection. If the power supply voltage is below 360 volts, it will increase the working current of the frequency converter, resulting in overcurrent protection tripping. 6. Issues with the frequency converter itself, such as damage to one of the rectifier templates on the back of the frequency converter, can cause the other two paths to operate in an overcurrent state, resulting in tripping.

2022-06-29

How to determine the exhaust pressure and water depth of a Roots blower?

1. Choose a reasonable installation location, reduce elbows, and ensure the outlet is directly facing the water tank. 2. Shorten the pipeline. 3. Increase the diameter of the outlet pipe. 4. If the incoming water can remain clean, the filter screen can be removed. 5. Adjust the axial clearance to prevent improper clearance between the impeller and the axial gap. Adjust according to the pump's factory instructions during use. 6. Timely remove blockages in the pipeline. Clear foreign objects left in the inlet pipe, impeller, or volute flow path. 7. Prevent air intake into the pump. If air enters the pump, the water output will decrease, requiring inspection and maintenance of all sealing components. The deeper the water, the higher the pressure, and the greater the motor power required for the Roots blower. Therefore, water depth will directly affect the selection of the Roots blower. As the water depth increases, the performance requirements for the Roots blower also increase, and correspondingly, the price of the blower also rises. Therefore, when purchasing a Roots blower, it is essential to choose a model with a high cost-performance ratio. Water depths exceeding 10 meters are considered high pressure, and the performance requirements for the Roots blower will be even higher. At this time, using a two-stage series Roots blower is generally more suitable, as ordinary Roots blowers usually cannot meet the requirements. When selecting a Roots blower, do not only look at the pressure value, but also pay attention to the air volume. Only when the air volume and pressure are matched can it be used. For the Roots blower, ensuring a continuous and stable air volume is essential to meet daily needs.

2022-06-27

Mingfeng Machinery shares how to adjust the gap of the Roots blower impeller.

(1) Cleaning 1. Disassemble the inlet and outlet pipelines of the Roots blower, remove the acidic sludge and debris inside the Roots blower, and then seal the lower inlet with a blind plate. 2. Disassemble the upper part of the Roots blower and add a 13% Na2CO3 aqueous solution until it does not overflow when the impeller is rotated, and appropriately rotate the Roots blower impeller to neutralize the acidic substances inside the blower. After 10-20 minutes, remove the lower blind plate to release the solution, and then repeat this cleaning method twice. Finally, rinse the inside of the Roots blower with clean water. 3. Timely lift out the impeller, remove the dirt and debris inside the Roots blower, between the two impellers, and inside the labyrinth seal. After cleaning the Roots blower, apply anti-rust oil to the wet areas to prevent rusting. 4. Hang the two impellers into the blower base and tighten the two end bearing boxes with two pressure covers. (2) Measurement Use the adjusting screws to align the two impellers towards the coupling side simultaneously, so that the gap between the end faces of the two impellers and the side face of the coupling reaches normal (approximately 0.4-0.5mm). Rotate the two impellers and check whether the four sets of labyrinth seal components are in the correct position. If not, record the dimensions for appropriate processing or handling when disassembling later. Measure the gap between the protruding parts of the two impellers and the arc surface of the Roots blower base, measure the gap between the protruding parts of the two impellers near each other, and measure the gap between the end faces of the two impellers and the inner vertical surfaces on both sides of the base. Mark and record at each of the above measurement positions. Tighten the cover plate, measure the gap between the protruding parts of the two impellers and the inner arc surface of the cover plate, and measure the gaps between the side faces of the cover plate and the side faces of the two impellers, marking and recording them as well. (3) Repair 1. Inlay protrusions (1) Process 12 protrusions according to the Size. The material depends on the medium contacted during the use of the Roots blower. If it contacts acid, it is recommended to use a certain strength acid-resistant material, such as stainless steel; the following processing materials are the same as this. (2) Mill and drill holes in the dovetail grooves at the four protruding positions of the two impellers according to the Size. (3) Process 36 bolts and 36 matching nuts according to the Size. (4) Inlay every 3 protrusions into the 4 dovetail grooves of the impeller, fastening with the bolts processed in (3). If any part is too tight during installation, it can be ground with a portable grinder. 2. Inlay end faces (1) Drill 12 bolt holes on each of the two impellers near the gear direction according to the Size. (2) Process 4 end face inlays for the two impellers near the gear direction (it is recommended to drill holes after the inlays are installed in the impeller). (3) Process 3 types of fastening inlay bolts, 8 of each type, and purchase or process 24 matching nuts (the nuts are processed according to common standards). (4) Install the inlay strips into the end faces of the two impellers near the gear direction, fastening with the bolts processed in (3).

2022-06-24