The whole process of installation of submersible sewage pump auto-coupling equipment
The submersible sewage pump integrates a pump and an electric mechanism. Its machinery and equipment are similar to other types of centrifugal water pump machinery and equipment. The general approach is: first carry out the foundation construction of the centrifugal water pump, and wait until the foundation of the centrifugal water pump generator set reaches the standard. Carry out the installation of pump casings and water outlets, accessories and equipment.
The submersible sewage pump is generally set in the sump (pit), and the machinery and equipment are divided into mobile machinery and portable machinery and equipment. Portable machinery and equipment are very simple. They are commonly used in small water pump machinery and equipment. Plastic hoses are generally used for the water outlet. Mobile machinery and equipment are rather chaotic. This type of machinery and equipment is generally used for large-scale submersible sewage pumps containing fully automatic coupling machinery and equipment. The sequence of machinery and equipment is: pouring concrete foundation, guide rod and pump seat, pump casing, water outlet and accessories.
Installation of submersible sewage pump: Lift the pump casing, and place the coupling equipment (coupling equipment, submersible sewage pump and electric motor are generally made into a complete set of machinery and equipment) in the guide rod, so that the pump casing is slowly reduced along the guide rod until the coupling The combined machinery and equipment are connected with the outlet elbow on the pump base, and the outlet axis of the centrifugal water pump overlaps with the inlet axis of the outlet elbow.
Installation of water outlet and accessories: The outlet of the centrifugal water pump and the outlet elbow are connected by flanges, and other accessories on the water outlet, including stop valves, compensators and check valves, are connected by flanges.
When the pump casing is being overhauled, people do not need to enter the sump (pit). Manual services or mechanical equipment can be used to clearly raise the pump casing from the sump (pit) pipe with an iron chain connected to the pump casing. The lifting support frame can be used as a long-term support frame or a temporary support frame. The lifting support frame is provided with an electric type, hand chain hoist or movable pulley, which is connected with the lifting iron chain.
Screw Impeller Pump
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What are the advantages of a submersible sewage pump?
1. The submersible sewage pump has compact structure, small volume, convenient movement and easy installation. It does not need to build a sewage pumping station, and it can work by diving into the water, greatly reducing the project cost.
2. The submersible sewage pump adopts double lower water absorption structure with low water absorption position. Because of the double suction type double flow channel single volute structure, the motor has no axial pulling force, which reduces and balances the light direction force and greatly improves the service life of the sewage pump. Times, the use efficiency is increased by 15%.
3.The use of large flow channel anti-blocking parts design, greatly improve the ability of dirt to pass, can effectively pass shorter fiber material and smaller diameter solid particles.
4. The sewage pump equipped with the external circulating water device can work continuously for a long time in the low water level. The large-flow submersible sewage pump with self-stirring impeller has an automatic mixing function, which can stir the water in the pool to make the sewage and dirt mix and discharge with the sewage pump.
5. The submersible sewage pump float switch can automatically control the stoppage of the sewage pump according to the required water level change, without special care.
6. The submersible sewage pump can be equipped with automatic safety protection control cabinet according to the user’s needs to monitor the leakage, leakage, overload and over-temperature of the large-flow submersible sewage pump to ensure reliable and safe operation of the sewage pump.
7. The double-rail automatic coupling safety system brings great convenience to the installation and maintenance of the large-flow submersible sewage pump. People do not have to enter and exit the sump for this purpose.
8. The characteristic is that there is a water leakage probe in the oil chamber. When the mechanical seal on the sewage pump side is damaged, the water enters the oil chamber, and the probe sends a signal to protect the sewage pump.
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Working principle of submersible sewage pump
The submersible sewage pump does not need to build a pump house, and it can work without directly diving into the water. The working principle of the submersible sewage pump and the submersible sewage pump are similar to those of the pump. The submersible sewage pump is mainly composed of an impeller, a pump body and a submersible motor. The water pump and the motor are on the same shaft. The water pump is located at the lowermost end of the submersible sewage pump, which can maximize the suction of the surface sewage. Because the submersible sewage pump has compact structure, small floor space, convenient installation and maintenance, long running time, no cavitation damage and irrigation water, the submersible sewage pump is widely used in cement plants, power plants, coal processing industries, Steel mills, petroleum, chemical and municipal wastewater treatment.
The submersible sewage pump adopts a unique single-blade impeller structure or a double-bladed impeller structure, which greatly improves the dirt passing ability. Some submersible sewage pumps also have a function of mixing or shredding, which can pass the pump diameter of 5 times the fiber material and the diameter of the pump. A solid particle of about 50% caliber. The submersible sewage pump is mechanically sealed with a new type of hard and corrosion-resistant tungsten carbide material, which can be placed in the oil chamber for a long time. The submersible sewage pump has two different installation methods, a fixed automatic coupling installation system and a mobile free installation system.
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Maintenance of submersible pump motors and maintenance of related valves, pipes and accessories
The visual inspection should be neat and tidy, the nameplate is intact, and the grounding wire is well connected.
Disassemble the wire connecting piece in the motor terminal box, and test the insulation resistance value of the phase and phase of the motor winding and the ground between the ground and the ground with a 500V megohmmeter to be not less than 0.5 megohm.
The three-phase wires and connecting pieces in the motor terminal box should be tight and tight.
Maintenance of valves, pipes and accessories related to Forever submersible pumps:
The switches of each valve should be flexible and reliable, with no leakage inside or outside.
The check valve should be flexible and there is no water leakage inside and outside the valve.
The pressure gauge is accurate and the dial is clear.
The appearance of the pipes and accessories is neat and beautiful, without cracks, and the paint should be intact without falling off.
Jog to determine if the pump steering is correct, if it is wrong, it should be corrected.
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How to improve the anti – cavitation performance of centrifugal pump
(1)Improve the centrifugal pump suction port to the impeller near the structural design. Increase the flow area; increase the radius of curvature of the inlet section of the impeller cover, reduce the rapid acceleration and decrease of the liquid flow; reduce the thickness of the inlet of the blade, and make the leaf inlet rounded so that it is close to the streamline, Reduce the speed of the blade around the blade and increase the surface of the impeller and the blade surface to reduce the loss of resistance;
(2)Use pre-induction wheel, so that the flow in the pre-induction wheel in advance to work to improve the flow pressure.
(3)Use double suction impeller, so that the flow from the impeller on both sides of the same time into the impeller, the import cross-section doubled, the import flow rate can be reduced by double.
(4)The design of the use of slightly larger positive angle to increase the blade inlet angle, reduce the blade at the entrance of the bend, reduce the blade blockage to increase the import area; improve the working conditions under high flow to reduce Flow loss. But the angle should not be too large, otherwise the impact of efficiency.
(5)Use anti-cavitation materials. Practice shows that the higher the strength, hardness and toughness of the material, the better the chemical stability and the stronger the resistance to cavitation.
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Fast and easy assembly of multi-stage centrifugal pump
Multistage centrifugal pumps should be placed as far as possible in a well ventilated place to facilitate rapid cooling and reduce motor temperature. Otherwise, run for a long time, easy to burn the motor.
If the use of multi-stage centrifugal pump, because did not remove the plastic film covered in the motor, causing the motor overheating, burn the coil. In addition, before starting, be sure to check the water inside the pump, otherwise, not only affect the self-priming performance, and easy to burn the shaft seal parts. Under normal circumstances, multi-stage centrifugal pump starts after 3 to 5 minutes that should be out of water, or should immediately stop inspection.
When the multi-stage centrifugal pump once a failure, avoid their own hands. Because of their own demolition, I do not know where the fault caused by blindly split a pass; Second, no special tools and often damage the original good parts. The best way is to have experienced, large-scale maintenance point repair, and timely replacement of “overage” parts and some wearing parts. Under normal circumstances, multi-stage centrifugal pump should be repaired once every six months, put an end to “sick” work.
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The reasons of no flow of multi-stage centrifugal pump
First,multi-stage centrifugal pump outlet pipe resistance is too large; pump direction of rotation; multi-stage pump impeller flow blockage or damage, pump speed is insufficient.
Second, check or shorten the horizontal multi-stage pump outlet pipe to eliminate dirt or replace the impeller impeller; check the pump motor, increase the pump speed.
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The main purpose of low temperature submersible pumps
The use of low-temperature submersible pumps is mainly used in oil and chemical plants to transport liquid hydrocarbons, liquefied natural gas and liquid nitrogen and liquid liquefied gas in refrigeration systems. Therefore, it is also called cryogenic pump.
The installation of the cryogenic pump and the operation of the cryogenic pump are:
1) cryogenic pump assembly parts are strictly prohibited with water and grease, parts must be washed with a solvent clean, dry and then assembled.
2) not only the cryogenic pump itself to be cold, low temperature pump suction line must also have cold measures to prevent the heat in the operation from the outside, so that the liquid vaporization, affecting the performance of the pump.
3) If there is oil, moisture and air in the cryogenic pump and piping, it will freeze when it enters the cryogenic liquid, so it needs to be cleaned before the cryogenic pump is put into operation and then scavenged with dry nitrogen. Pump the water and air, and pre-cooling.
4) The suction port and the suction pipe of the cryogenic pump should have the exhaust device so that the pump can remove the gradually accumulated gas before and during the operation to ensure the reliable operation of the cryogenic pump.
5) In the case of explosive gas, the motor should use vertical explosion-proof motor.
6) low temperature transmission can also use low temperature shielding pump or stainless steel magnetic pump.
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Whether the outlet valve can be closed for a long time when the centrifugal pump is running?
When the centrifugal pump is running, the outlet valve can not be closed for a long time.
When the centrifugal pump outlet valve closed is not closed, if the flow is too small, only the efficiency of centrifugal pump will drop, waste electricity, no effect on the centrifugal pump equipment. Once the closure of the valve is too small to a certain limit, will lead to centrifugal pump noise and vibration increases, the performance of the centrifugal pump will appear unstable phenomenon. 
And the centrifugal pump valve closed in the case of long-term operation will lead to the pump inside the liquid temperature rise, once the centrifugal pump is running in a closed state of small flow or no flow operation, the water pump in the pump through the role of high-speed rotation Water in the pump chamber in the rapid cycle and the pump friction, will lead to a sharp rise in pump temperature, the export pressure will rise, if the pump temperature is too high or even lead to the risk of pump burst, the motor current will rise, The current can also cause the motor to burn out of the fault. So the centrifugal pump can not turn off the outlet valve for a long time.
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Safety Measures of Sewage Pump
When we choose and use the sewage pump before the need to choose according to the actual situation and the corresponding treatment, the general life of our sewage and waste water has its own different characteristics, so we need to choose the appropriate time to choose the sewage pump. There are a lot of sewage and waste water containing a large number of corrosive substances, When the sewage is used to enhance the operation of the sewage pump should choose to ch
oose anti-corrosion materials such as stainless steel. Diving sewage pump is one of them, when we use the submersible sewage pump should be installed when the leakage device, but also need to set Overheating or overloaded devices, which are important for the safety of the operation, as well as the installation of a sealed leak monitoring device so that the corresponding treatment can be made in a timely manner when the submersible pump is leaking
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