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Factory Direct Sales Horizontal Multistage PumpS CMF2-20 50HZ
Submersible pumps are a great product for water extraction. They can be used to pump water from deep underground, which is a useful tool for farming as well as spa centers. The submerged pump can handle all of these tasks. In addition to the ability to extract water forcefully, it features an efficient and quiet design that blends well with any environment.
Submersible water pumps are a cylindrical motor with a propeller inside and a diaphragm that separates the inner part from the outside. Under low pressure, the water will easily pass through the diaphragm, so it can extract water from deep underground at high efficiency.
The basic structure of the multistage pump is composed of water inlet section, water outlet section, middle section, tail cover, impeller, pump body, pump shaft, bearing, sealing ring, stuffing box and other components.
1. The impeller is the core part of the multi-stage pump. Its speed is higher than that of the pump, and its force is large. The blades on the impeller play a major role. The impeller must pass the static balance test before assembly. The inner and outer surfaces of the impeller are required to be smooth to reduce the frictional loss of water flow.
2. The water inlet section, the water outlet section and the middle section are also called the pump casing, which is the main body of the multistage pump. It plays a role of support and fixation, and is connected with the bracket on which the bearing is installed.
3. The role of the pump shaft is to connect the motor with the coupling to transmit the torque of the motor to the impeller, so it is the main component that transmits mechanical energy.
Stainless steel multistage pump
Stainless steel multistage pump (2 photos)
4. The bearing is a component that is sleeved on the pump shaft to support the pump shaft. There are two types of rolling bearings and sliding bearings. Rolling bearings use tallow as a lubricant and refuel properly. Generally, 2/3 to 3/4 of the volume is too much and it will generate heat, and if it is too small, it will make noise and generate heat! Sliding bearings use transparent oil as lubricant, add oil to the oil level line.
pump-Product parameters
| 50Hz | |||||||||
| Model | Model | Driving motor P2(KW) | Q | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 |
| (m3/h) | |||||||||
| CMF2-20 | CHL2-20 | 0.37 | H(m) | 18 | 16 | 14 | 13 | 11 | 10 |
Product Description
It is a device dedicated to extracting water from deep underground. In the process of use, the entire equipment is immersed in the bottom of the water for work, and then the underground water source is extracted to the surface.
Submersible pumps are very versatile, many spa centers use it for water extraction, and many farmland irrigation uses it to extract groundwater.
Product Feature
Compact structure and small footprint: The submersible sewage pump can be directly installed in the sewage tank because it works submerged in the liquid. There is no need to build a special pump room to install the pump and the machine, which can save a lot of land and infrastructure costs.
Easy installation and maintenance: Small submersible sewage pumps can be installed freely, and large submersible sewage pumps are generally equipped with an automatic coupling device for automatic installation, which is very convenient for installation and maintenance.
Long continuous operation time: Since the pump and the motor are coaxial, the shaft of the submersible sewage pump is short, and the rotating parts are light in weight, so the load (radial) on the bearing is relatively small, and the service life is much longer than that of the general pump.
There are no problems such as cavitation damage and irrigation and water diversion. Especially the latter point brings great convenience to the operator.
The vibration noise is small, the motor temperature rise is low, and there is no pollution to the environment.
the multistage pump maintenance
- Check the multi-stage pump pipeline and joints for looseness. Turn the multistage pump by hand to see if the multistage pump is flexible.
- Add bearing lubricating oil into the bearing body, observe that the oil level should be at the center line of the oil mark, and the lubricating oil should be replaced or supplemented in time.
- Unscrew the water diversion plug of the pump body of the multi-stage pump, and pour water diversion (or slurry diversion).
- close the gate valve of the water outlet pipeline, the outlet pressure gauge and the inlet vacuum gauge.
- jog the motor to see if the direction of the motor is correct.
- If the multi-stage pump is out of use for a long time, it is necessary to disassemble all the pumps, wipe off the water, and coat the rotating parts and joints with grease.
- Try to control the flow and head of the multi-stage pump within the range indicated on the sign to ensure that the multi-stage pump operates at the highest efficiency point in order to obtain the greatest energy saving effect.
- During the operation of the multi-stage pump, the bearing temperature should not exceed the ambient temperature of 35C, and the maximum temperature should not exceed 80C.
- If the multi-stage pump is found to have abnormal sound, stop immediately to check the cause.
- When the multi-stage pump is to be stopped, first close the gate valve and pressure gauge, and then stop the motor.
- In the first month of operation, the multi-stage pump should replace the lubricating oil after 100 hours, and then change the oil once every 500 hours.
- The multi-stage pump should adjust the packing gland frequently to ensure that the dripping situation in the packing chamber is normal (it is advisable to leak out in drops).
- Regularly check the wear of the multi-stage pump shaft sleeve, and replace it in time after the wear is large.
- When the multi-stage pump is used in the cold winter season, after stopping, it is necessary to unscrew the drain plug at the bottom of the pump body to drain the medium. Prevent freeze cracking.
- Start the motor. When the multi-stage pump is in normal operation, open the outlet pressure gauge and the inlet vacuum pump to see if they show proper pressure, then gradually open the gate valve and check the motor load at the same time.
Precautions when using
1.Install the leakage protector
When working underwater, the equipment is easy to leak current, causing losses and even dangerous accidents. If a protector is installed, as long as the leakage value exceeds the allowable weak current value, the device will automatically cut off the power supply to avoid waste and ensure safety.
2.Avoid frequent switching
Do not turn the pump on and off repeatedly for a short period, as the electric pump will backflow when stopped. If you turn it on immediately, the motor will start the load, causing too much starting current and burning out the windings. Repeated switching can also burn submersible pump motor windings due to the large charge flow at startup.
3.Do not let the submersible pump work for a long time
To prevent the electric pump from working under a high load for a long time, try not to vertical immersion pumps water when there is too much sand, and always observe whether the current value is within the value range specified on the nameplate. If the value is found to be too large, it should be turned off to check. In addition, the dehydration operation time of the electric pump should not be too long to prevent the motor from overheating and burning.
Five reasons why the pump does not discharge water after starting?
There is air in the water inlet pipe and pump body
(1)The water vertical immersion pumps was not filled with enough water before starting, and sometimes it seemed that the filled water had overflowed from the vent hole, but the air was not completely discharged by rolling the pump shaft, resulting in a little air remaining in the water inlet pipe or pump body.
(2)The horizontal section of the water inlet pipe in contact with the water pump shall apply a downward slope of more than 0.5% against the water flow direction, and the end connecting the water pump inlet shall be high, not completely horizontal. If it tilts upward, air will remain in the water inlet pipe, reducing the vacuum in the water pipe and pump, affecting water absorption.
(3)The packing of the water pump has been worn out or the packing has been pressed too loose due to long-term use, causing a large amount of water to be ejected from the gap between the packing and the pump shaft sleeve. As a result, external air enters the inside of the water pump from these gaps, affecting the water lifting.
(4)Because the water inlet pipe has been submerged for a long time, holes appear in the pipe wall due to erosion, and the water surface continues to decline after the pump works. When these holes emerge from the water surface, air enters the water inlet pipe from the holes.
(5)Cracks appear at the elbow of the water inlet pipe, and a small gap appears at the connection between the water inlet pipe and the water pump, which may make air enter the water inlet pipe.
Water pump speed is too low
(1)Human factors. Due to the damage to the original motor, some users randomly add another motor to drive, resulting in the consequences of small flow, low lift, and even no water supply.
(2)Mechanical failure of the water pump itself. The loose fastening nut between the impeller and the pump shaft or the deformation and bending of the pump shaft may cause the impeller to move more, direct friction with the pump body, or bearing damage, which may reduce the speed of the water vertical immersion pumps.
(3)The maintenance of the power machine is not effective. The motor loses excitation due to the burnout of the winding. The change in the number of turns, wire diameter, and wiring method of the winding during maintenance or the failure in maintenance is not eliminated, which will also change the speed of the water pump.
Suction lift too large
Some water sources are deep, the surrounding terrain of some water sources is relatively flat, and the allowable suction range of the vertical immersion pumps is ignored, resulting in less or no water absorption (official account: pump pipe). You should know that there is a limit to the vacuum that can be established at the suction port of the water pump. The suction range of the vacuum is about 10 meters high, and the water pump cannot establish the right vacuum. And if the vacuum is too large, it is easy to vaporize the water in the pump, which is unfavorable to the work of the pump. Therefore, each centrifugal pump has its large allowable suction lift, which is generally between 3-8.5 meters. When installing the water pump, you must not only seek convenience and simplicity.
The resistance loss in the inlet and outlet pipes of water flow is too large
Some users have measured that although the vertical interval between the reservoir or water tower and the water surface of the water source is slightly smaller than the pump lift, the water volume is still small or cannot be lifted. The reason is often that the pipeline is too long, there are many water pipe bends, and the resistance loss of water flow in the pipeline is too large. The reason is often that the pipeline is too long, there are many water pipe bends, and the resistance loss of water flow in the pipeline is too large. Generally, the resistance of a 90-degree elbow is greater than that of a 120-degree elbow. The head loss of every 90-degree elbow is about 0.5-1 meter, and the resistance of every 20 meters of pipe can make the head loss about 1 meter. In addition, some users also use the diameter of the inlet and outlet pipes of the water vertical immersion pumps at will, which also has a certain impact on the lift.
Influence of other factors
(1)The bottom valve cannot be opened. Usually, the bottom valve gasket is stuck because the water vertical immersion pumps has been used for too long, and the bottom valve without a gasket may rust.
(2)The bottom valve filter net is blocked; Or the bottom valve is hidden in the sludge layer in the water, causing the filter screen to be blocked.
(3)The impeller is severely worn. The impeller blades are worn out after long-term use, which affects the function of the water pump.
(4)The failure or blockage of the check valve of the gate valve will reduce the flow and even fail to vertical immersion pumps water.
(5)The leakage of the outlet pipeline will also affect the water extraction.
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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 vertical immersion 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.
