15 problems in daily maintenance of centrifugal pump

 

The centrifugal pump works by centrifugal movement of water when the impeller rotates. Before starting the pump, the pump casing and suction pipe must be filled with water, and then the motor can be started to drive the pump shaft to drive the impeller and make the water perform high-speed rotation. The pressurized water line into the pump.
1. Check whether the pump vibrates abnormally. If vibration occurs, stop the pump immediately for inspection.
2. Check whether the bearing temperature is normal. Too high temperature will accelerate bearing damage and shorten the service life of the pump.
3. Check whether the lubricating oil level is normal. If the lubricating oil expires, it needs to be replaced frequently.
4. Check whether the lubricating oil temperature is normal
5. Check whether the lubricating oil is qualified
6. Check whether the leakage meets the requirements. For serious leakage, please check whether the mechanical seal is damaged.
7. Check whether the sealing fluid operates normally
8. Check whether the sealing cooling medium is normal
9. Check whether the cooling water system is normal
10. Check whether the grounding of the motor is intact. Please pay attention to whether the grounding bolt is loose and tighten it in time.
11. Check whether the motor vibration is normal
12. Check whether the motor bearing temperature is normal
13. Check whether the motor current is normal. If the current is too high, the centrifugal pump will not work properly.
14. Check whether the pump inlet pressure is normal and stable
15. Check whether the pump outlet pressure and flow are normal and stable

Vacuum Pumps for Food Packaging Machines

How to reduce the energy consumption of centrifugal pump?

 

The efficiency of centrifugal pump is the product of mechanical efficiency, volumetric efficiency and hydraulic efficiency. The efficiency of single-stage centrifugal pump unit is the product of pump efficiency and motor efficiency. How to reduce energy consumption and improve efficiency of centrifugal pump?
1. Application of frequency conversion energy-saving technology. For centrifugal pumps whose design parameters are greater than the actual working conditions, the centrifugal pump will always operate in the high efficiency zone after installing the variable frequency speed control device.
2. Promote the application of high-efficiency energy-saving permanent magnet motor, dual-power motor and other energy-saving new products on the main centrifugal pump.
3. Selection of centrifugal pump. When selecting a new pump, the pump produced by a large manufacturer should be selected to ensure the high efficiency of the centrifugal pump.
4. Maintenance of centrifugal pump.
(1) Frequently check and adjust the shaft end seal of the centrifugal pump to reduce the volume loss;
(2) After 10000 hours of operation, the centrifugal pump should be overhauled to restore the efficiency of the pump;
(3) Applying bellows sealing technology to centrifugal pump can completely eliminate the leakage of centrifugal pump and improve the volumetric efficiency.
5. Clean the filter cartridge regularly, check the pipe connection, and ensure that the inlet pipe of the centrifugal pump is smooth.
6. In strict accordance with the operating regulations of centrifugal pump, before starting the pump, the disc pump must be started, the inlet valve must be opened, the outlet valve must be closed, the exhaust and exhaust must be conducted, and the inlet pressure of the pump must be checked to see if it meets the requirements. Prevent pump cavitation caused by low supply pressure and insufficient flow.
7. Regularly check the pump efficiency of the centrifugal pump, find out the cause of low pump efficiency in time, and take corresponding measures to solve it.

dry screw vacuum pump of reasons for lack of air volume

Non clogging submerged pump

YW series non clogging submerged pump, GW tubular non clogging sewage pump and LW (WL) vertical sewage pump are all designed based on QW submersible sewage pump according to user requirements and different operating conditions. Their hydraulic models and QW pumps are welcomed and praised by users for their unique design and reliable quality after they are put on the market.
2、 Scope of application:
YW series non clogging submerged pump is applicable to the discharge of industrial, sewage and conveyor belt granular sewage such as factory sewage, sewage discharge stations in main residential areas, urban sewage treatment plant water distribution system, civil air defense drainage station, water supply equipment of water plants, hospitals, hotels, municipal engineering construction sites, mine auxiliary machinery, rural biogas digesters, farmland irrigation, etc. It can also be used in clean water and weak corrosive media.
3、 Service conditions:
1. When the rated voltage is 380 V and the power frequency is 50 Hz, this series of sewage pump products are applicable.
2. The medium temperature shall not exceed 120 ℃, the density shall be less than 1150 kg/m3, and the PH value shall be within the range of 5:9;
3. The height shall not exceed 1000m;
4. The annual viscosity of the conveying medium shall not exceed 1000 CP. The annual viscosity of the conveying medium shall not exceed 1000 CP.
5. When the product is working, it must be completely submerged, but the diving depth shall not exceed 10m;
6. The material of the product is mainly cast iron, which cannot be used in the medium with strong corrosion or strong corrosion.

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Differences of Self priming Centrifugal Pumps

In order to better discharge the gas in the moisture absorption pipe and generate a certain vacuum value during the operation of the general centrifugal pump, the exhaust pipe must be used. For small pumps, the pump casing and water inlet must be filled with water before starting. In order to better avoid the jump of water injection, the bottom end of the water inlet is equipped with a unilateral pump bottom valve that opens when the water flows upward and closes when it flows downward; Generally, large centrifugal pumps with water seepage specifications above 300 mm are not equipped with bottom valve of water pump, but only use professional vacuum equipment to vacuum drinking water. There is no doubt that the startup of the feed pump will cause inconvenience, resulting in waste.
Principle: The centrifugal pump is operated by the centrifugal movement of water generated by the rotation of the impeller. Before starting the water pump, be sure to fill the pump housing and the moisture absorption pipe with water, and then start the motor to make the pump shaft push the impeller and water for high-speed running fitness exercise. The water produces centrifugal movement and is thrown to the edge of the impeller. The water is injected into the pressurized tap water pipeline of the pump through the gate of the volute pump housing.
Structure: The centrifugal pump operates by the centrifugal movement of water generated by the rotation of the impeller. The main structure of centrifugal pump is composed of 61 parts, namely impeller, pump housing, pump shaft, rolling bearing, sealing ring and ferrule joint.
The structural type of self-priming centrifugal pump has been improved to get rid of the shortcomings of general pipeline centrifugal pump. Self priming centrifugal pump has the advantage that the pump casing is of double volute structure. The detergent port is located on the edge of the pump impeller, and there is a large capacity vapor liquid separation chamber on the liquid outlet. Other structures are similar to single pole single suction centrifugal pumps, including sealing rings, mechanical seals, shafts and rolling bearings. When the self-priming pump is started for the first time during operation, the water diversion channel must be introduced into the pump casing, and the introduction amount can exceed the pump centerline in the pump casing. After that, the fully automatic suction pipe can be started at any time and anywhere, without introducing the diversion canal, so the application is more convenient than the pipeline centrifugal pump.
Principle: The design principle of self-priming pump is to fill the pump casing with water (or the pump casing itself has water) before starting the pump. After startup, the impeller runs at a high speed to make the water in the impeller channel flow to the volute. At this time, the channel generates a vacuum pump to open the seepage check valve. The gas in the suction pipe enters the pump and reaches the edge through the impeller channel.
Structure: Self priming centrifugal pump is a kind of centrifugal pump, but compared with centrifugal pump, its big difference is that it has "self priming" characteristics. The main structure of self-priming pump is composed of suction chamber, liquid storage chamber, scroll chamber, liquid collection hole, vapor liquid separation chamber, etc.

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Take you to understand the complete knowledge of flanges used in chemical pumps! You can have a look

Everyone should be familiar with chemical pumps. Chemical pumps, centrifugal pumps, magnetic pumps, axial flow pumps, multistage pumps, etc. The inlet and outlet are all connected by flanges, and the corresponding pipes should also be welded with flanges. Today we will talk about what is the looper flange, what is the flange, how to weld and so on.
1、 What is a looper flange, where is the looper flange used and in what pipe fittings?
Looping flange is a movable flange, which is generally matched on the water supply and drainage fittings (* * * is common on the expansion joint). When the manufacturer leaves the factory, there is a flange at both ends of the expansion joint, which is directly connected with the pipeline and equipment in the project with bolts.
2、 How is the flange connected to the pipe and where is it welded?
There are many flange classifications. Flat flange, butt welding flange (long neck flange) and looper flange are generally used. The flat welding flange is used for medium and low pressure. It is welded on both sides by butt welding. The welding depth is 2-5mm from the flange sealing surface. The butt welding flange can be directly butt welded. The looper flange bolt connection does not need welding.
3、 What does flange type mean?
The flange is a connecting piece used to connect the valve and the pipeline. That is, when the valve is connected with the pipeline, the connection is connected by bolts. Therefore, the two end faces of the valve with N uniformly distributed bolt holes are flange type.
1. Flange: flange is a transliteration of flange, which means something or part with flange. This kind of part can be independent, that is, a flange plate, or a combination type. For example, one end or both ends of the pipe have flanges, and there are several through holes on the flange for installing screws. Some bearing outer rings have flanges. This flange can have holes or no holes, and it is only used for positioning the flange.
2. Flange type: the connection between the valve and the pipeline or machinery and equipment is flange connection, which is generally called flange type.
4、 What is a flange?
Flange is a kind of disc part, which is common in pipeline engineering. Flanges are used in pairs. In pipeline engineering, flanges are mainly used for connection of pipelines. For the pipes to be connected, a flange plate shall be installed for each type. Screw flanges can be used for low pressure pipes, and welding flanges can be used for pipes with a pressure of more than 4 kg. Add sealing points between the two flanges and fasten them with bolts. Flanges with different pressures have different thicknesses and use different bolts. When pumps and valves are connected with pipes, parts of these equipment are also made into corresponding flange shapes, also known as flange connection. All connecting parts that are bolted on the periphery of two planes and closed at the same time are generally called "flanges", such as the connection of ventilation pipes. Such parts can be called "flange parts". However, this connection is only a part of the equipment, such as the connection between the flange and the water pump, so it is not good to call the water pump a "flange part". Smaller, such as valves, can be called "flange parts".

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