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PUMPS CM4-20 50HZ
The Centrifugal Water Pump is designed for water supply for agricultural irrigation, mining and other fields. The centrifugal water pump is equipped with two impellers and two curved vanes. It is an ideal choice for pumping clean water.
A high pressure, large diameter impeller has a blade length of more than one meter, which is a typical type of high efficiency centrifugal pump. When the impeller rotates, the surge vent on the perforated metal plate rotates with a large effective diameter, so that the pressure difference between both sides of the fan blade can be increased and increased by rotating it continuously to run smoothly and efficiently.
Product parameters
| 50Hz | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Model | Model | Driving motor P2(KW) | Q (m3/h) |
2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 7.0 |
| CM4-20 | CHLF4-20 | 0.55 | H(m) | 18 | 16 | 15 | 13 | 10 | 7 |
Daily Maintenance
- Check the water pump power cord for wear, surface cracking, and copper core leakage. If something happens and the wire is grounded, you can wind the wire.
- Frequently check whether the water pump impeller is blocked by foreign matters. Check whether the sound of the water pump is good during operation. For after-sales service, please contact the relevant manufacturer.
- Daily inspection and maintenance of domestic water pump and air conditioning pump shall be conducted once a week. Carry out comprehensive maintenance every 6 months. The fire pump and spray pump shall be tested once a month. In addition, the booster pump shall be tested every two months. Submersible pumps and sewage pumps need to be fully maintained every 6 months.
- Ensure that the pump is not damaged and the water flow direction is clear. Add lubricant that will not affect the clean appearance and color. If the oil is discolored and contaminated, it needs to be replaced. Check the packing seal. If there is leakage, add or replace the asbestos rope packing. If the coupling bolt and coupling rubber gasket are damaged, they need to be replaced. Tighten the base screws to prevent rust.
- Engine maintenance. Disconnect the wiring connection of the motor junction box, and use a 500V megger to test the interphase insulation resistance of the motor winding, which must be 0.5 M Ω or higher. In this link, the three-phase cables and connectors in the motor junction box must be tightened.
- Maintenance of valves, pipelines and related equipment. Each valve switch must be flexible and reliable. In addition, there should be no internal or external leakage. The one-way valve must be flexible during operation, and there should be no water leakage inside and outside the valve body. The pressure gauge displays accurately and the dial is clear. The appearance of pipes and accessories shall be clean and beautiful without cracks, and the paint shall be intact. Shake to determine whether the water pump rotates correctly. If there is any abnormality, it needs to be repaired.
Technical questions and answers about pumps
What is the static balance?
A: Generally, on some special tooling, it is not necessary to rotate to measure the front direction of the imbalance of the rotating parts, and at the same time, it can determine the position and size of the balancing force. This method of finding balance is called static balance.
What is the dynamic balance?
A: When the parts rotate through the components, it is necessary to balance not only the centrifugal force generated by the eccentric weight but also the balance of the couple moment composed of the centrifugal force, which is called dynamic balance. Dynamic balance is generally used for machine parts with high speed, large diameter, and particularly strict working accuracy requirements, which must be accurately balanced.
When doing static balancing of rotating parts, how to measure the eccentric orientation of the balanced parts?
A: First, let the balanced part roll freely on the balance tooling several times. If the last time is clockwise rotation, the center of gravity of the part must be located on the right side of the vertical centerline (due to friction resistance). At this time, make a mark with white chalk at the lowest point of the part, and then let the part roll freely. The last rolling pendulum is completed in the counterclockwise direction, then the center of gravity of the balanced part must be located on the left side of the vertical centerline, Similarly, make a mark with white chalk, then the center of gravity of the two records is the biased orientation.
How to determine the size of the balance weight when doing the static balance of rotating parts?
A: First, turn the eccentric direction of the part to the horizontal position, and add appropriate weight at the maximum circle of the symmetrical position on the opposite side. When choosing the position of weight addition, we should consider this point, and whether we can balance and reduce the weight in the future. After the weight addition, we should still keep the horizontal position or swing slightly, and then reverse the part 180 degrees to keep the horizontal position. Repeat several times. After the weight is determined to be unchanged, we should take the weight as the weight, which determines the gravity of the balance weight.
What are the types of mechanical rotor imbalance?
A: static imbalance, dynamic imbalance, and mixed imbalance.
How to measure the bending of the pump shaft?
A: After the shaft is bent, it will cause an imbalance of the rotor and the wear of the dynamic and static parts. Put the small bearing on the V-shaped iron, and the large bearing on the roller support. The V-shaped iron or support should be placed firmly, and then put the dial indicator on it, with the stem pointing to the axis, and then slowly turn the pump shaft. If there is bending, the micrometer has a maximum and minimum reading for every revolution. The difference between the two readings indicates the maximum radial runout of the shaft bending, also known as the wobble. The shaft curvature is one-half of the runout. Generally, the radial runout of the shaft is not more than 0.05mm in the middle and more than 0.02mm at both ends.
Application field
① In the production of chemical and petroleum sectors, most of the raw materials, semi-finished products and finished products are liquids, and the production of semi-finished and finished raw materials into semi-finished products and finished products needs to go through complex technological processes. During these processes, pumps play a role in transporting liquids and providing pressure flow for chemical reactions. In addition, in many installations, pumps are used to adjust the temperature.
② In agricultural production, pumps are the main irrigation and drainage machinery. my country's rural areas are vast, and a large number of pumps are needed in rural areas every year. Generally speaking, agricultural pumps account for more than half of the total output of pumps. Pumps are also the most used equipment in the mining and metallurgical industries. The mine needs to be drained by pumps, and in the process of beneficiation, smelting and rolling, pumps are needed to supply water.
③ In the power sector, nuclear power plants need nuclear main pumps, secondary pumps, and tertiary pumps, and thermal power plants need a large number of boiler feed pumps, condensate pumps, oil and gas mixing pumps, circulating pumps, and ash pumps.
④ In national defense construction, the adjustment of aircraft flaps, tail rudders and landing gear, the rotation of warships and tank turrets, and the ups and downs of submarines all require pumps. High pressure and radioactive liquid, and some also require the pump without any leakage.
⑤ In short, whether it is aircraft, rockets, tanks, submarines, drilling, mining, trains, ships, or everyday life, pumps are needed everywhere, and pumps are running everywhere. That's why the pump is listed as a general-purpose machine, which is a major product in the machinery industry.
⑥ Electric pumps, i.e. pumps driven by electricity. The electric pump is composed of a pump body, a water lift pipe, a pump base, a submersible motor (including cables) and a starting protection de
