What factors should be considered when choosing the material of the sump pump?

You need to consider the factors:

1) Abrasion resistance of the medium. The material has a certain range of corrosion resistance to the medium, such as acid resistance 1Cr18Ni9, corrosion resistance of medium and dilute concentration of nitric acid or organic acid, and third, corrosion resistance of dilute sulfuric acid.

2) Galvanic corrosion. It is best to use the same metal material for the entire flow channel of the sump pump.

3) Medium temperature. The material is brittle at very low temperatures and creeps at high temperatures; A certain material can resist the corrosion of a certain medium at room temperature, but is not resistant to the corrosion of the medium at high temperature; The material properties should be able to meet the requirements of the temperature of the conveyed medium.

4) Economy. High-material, low-use or corrosion-resistant materials in design or use are not economical when non-corrosion-resistant materials are used.

5) Abrasion resistance of solid particles. Abrasive solid particles in the medium are abrasive, and wear-resistant materials should be used.

6) Occlusion of material parts. For parts with relative motion, such as shafts and bushings, bolts and nuts, impeller sealing rings and pump body sealing rings, balance plates and balance plates, etc., the hardness of the two parts should be somewhat different when selecting materials, otherwise they are easy to bite or scratch each other during loading and unloading or operation.

7) The magnitude of the temperature difference on the same part. The parts with a large temperature difference between the same clerk during work, such as the place where the cooling water jacket of the hot oil pump stuffing box meets the pump body, the pump body in contact with the medium has a high temperature and large expansion; The cooling jacket in contact with cold water has a low peripheral temperature and low expansion. Such parts should be made of materials with good plasticity, and cracks will occur due to different expansion during operation on one side.

8) Where the high-speed liquid flow passes. The impeller blades, guide vane inlet side, single-stage head high sealing sleeve, balance sleeve, balance plate and balance plate of the high head pump should be made of erosion-resistant materials (chromium stainless steel or chromium-nickel acid-resistant steel).

9) Parts that need to be welded. In the process of casting, processing and use, the parts that need to be repaired should be welded with materials with good weldability.

10) The single-stage head is very high. For pumps with single-stage heads of hundreds of meters or even thousands of meters, the materials of the impeller and guide vanes should be made of high-strength steel that is resistant to erosion and cavitation, such as precipitation hardening stainless steel.

1. When there is a displacement adjustment, it can be selected according to the flow rate of domestic drainage. The flow rate of the drainage pump in the fire elevator sump is not less than 10L s. The head of the drainage pump is determined according to the lifting height and pipeline loss, and then a certain free head is added.

Free head should be used. The flow rate of the suction pipe and outlet pipe of the drainage pump should not be less than and should not be greater than. A standby pump should be set up in each domestic drainage collection tank in the public building, and it should be operated interactively at ordinary times.

Basement, equipment room, garage to flush the ground drainage, if there are two or more drainage pumps, do not need to use pumps. 2. When the sump cannot be equipped with an accident drainage pipe, the pump should have uninterrupted power**;

3. When the drainage inlet pipe can be closed, there is no uninterrupted power**, but an alarm device should be set.

4. When lifting sewage and wastewater with large impurities, the outlet pipes of submersible sewage pumps in different sumps should not be combined and discharged. 5. When lifting general wastewater, the submersible sewage pump outlet pipes of different sumps can be considered for combined discharge according to the actual situation. When two or more pumps share a single outlet pipe, valves and check valves should be installed on the outlet pipe of each pump.

When there is a possibility of backflow in the drainage of a single pump, a check valve should be installed. It is not allowed to combine the pressure drain with the gravity drain pipe in the building.

6. When the submersible sewage pump is lifted and contains large sundries, the submersible sewage pump should be equipped with a crushing device; When lifting sewage containing more fibers, it is advisable to use a large-channel submersible sewage pump.

7. When the motor power is greater than or equal to or the diameter of the outlet pipe is greater than or equal to DN100, the water pump fixed autocoupling device can be used;

8. When the motor power of the submersible sewage pump is less than or the pipe diameter of the outlet is less than DN100, the hose can be installed in a mobile manner. When the sewage collection tank is drained by a submersible sewage pump, a fixed self-coupling device for the pump should be set up to facilitate the maintenance of the pump. The dewatering pump should be able to start and stop automatically and manually on site.

Multiple pumps can be operated in parallel and alternately, or they can be put into operation in sections.

There are many types of pumps commonly used in wastewater treatment processes, each with its own specific role and application scenario. Here are a few common sewage treatment pumps and their functions:

Submersible sewage

pump): Submersible sewage pump is a kind of pump that can work in sewage, its motor and pump body are encapsulated in a sealed Zaofeng shell, which can be soaked in sewage for a long time. Submersible sewage pumps are typically used for the suction, conveying and discharge of sludge and sewage in sewage treatment plants.

Return Sludge

pump): A reflux pump is used to return sludge from the bottom of a sedimentation tank to a biological treatment tank (e.g. an activated sludge tank). The main function of this pump is to maintain the biomass of microorganisms in the biological treatment tank, thus ensuring the treatment effect.

Self-priming pumps (self-priming

pump): Self-priming pumps have a self-priming capacity and can handle liquids containing solid particles, gases, and other impurities. In wastewater treatment processes, self-priming pumps are often used to transport sewage and sludge, especially when there are large changes in liquid level.

Sludge pump (sludge

Pump): Sludge pumps are specifically designed to convey high concentration, high viscosity sludge. This pump has a high head and flow rate, which can effectively treat and convey sludge, and is often used in sludge dewatering and thickening.

Chemical dosing

pump): The chemical metering pump is used to add chemicals to the sewage treatment process, such as flocculants, disinfectants, etc. The pump has high-precision metering and delivery capabilities that allow for precise control of dosage of chemicals.

Centrifugal pump (centrifugal

pump): Centrifugal pumps also have certain applications in the process of sewage treatment, especially when transporting clean water, chemical liquids and other media. Centrifugal pumps often need to be filled with water before start-up and have a weak ability to handle particulate matter.

In wastewater treatment, different types of pumps may be required depending on the process and equipment needs. When selecting the pump, the actual needs of the stool, the nature of the medium, the operating conditions and other factors should be fully considered.

The lifting pump is generally used to lift the waste water of the tomato.

The reflux pump can also be used as a centrifugal pump or as a submersible pump to circulate the sludge inside the biochemical system.

Submersible sewage pumps are mainly aimed at some wastewater or sludge with relatively high concentrations.

The screw pump is mainly used for the transfer of sludge press filtration.

The chemical pump has a diaphragm pump and a centrifugal pump to transport the agent.

In the chemical project, the reasonable selection of the pump is of vital significance for the successful transportation of materials and the stability and reliability of the long-term operation of the device. On the basis of meeting the process requirements, the specific model of the sewage treatment pump is determined by comprehensively considering the influence of equipment layout, pipeline layout and other aspects.

1. Physical and chemical properties of the conveying medium.

Affects pump performance, materials, and construction. Including: medium characteristics (such as corrosive, abrasive, toxic, etc.), solid particle content and particle size, density, viscosity, vaporization pressure, etc.

2. Selection parameters.

Flow, head, temperature, NPSH, operating status.

3. Site conditions.

Pump installation location, ambient temperature, relative humidity, atmospheric pressure, atmospheric corrosion conditions and hazardous area classification level, etc.

4. Shaft power and efficiency.

Shaft power: The power transmitted by the prime mover to the rotating shaft of the pump during the operation of the pump is called shaft power, which is expressed by P and the unit is KW. The amount of power obtained per unit time through the fluid of the pump is called effective power and is denoted by PE.

The efficiency of the pump is the ratio of the effective power to the shaft power, i.e. =pe p.

Efficiency: The efficiency of the pump is related to the design level of the pump itself, the level of machining, etc., the efficiency directly affects the energy consumption, and the pump has its own efficiency range, which needs to fall in this range when selecting to reduce energy consumption.

5. Rotation speed. The rotational speed of the pump shaft per minute, known as the rotational speed, is expressed in n in r min. The speed generally corresponds to the standard speed of the motor, and the speed of the motor can be adjusted through the inverter, and the performance curve of the pump also changes accordingly.

When the actual flow head changes, the adjustment through frequency conversion can achieve a good energy-saving effect.

1. Principle and classification of sewage pump In the professional definition, pump refers to the power equipment that converts the mechanical energy of the prime mover into the pressure energy and kinetic energy of the fluid, so as to realize the directional transportation of fluid. In use, it is often used according to the purpose.

1.Vane pumps.

Vane pumps include centrifugal pumps (single-stage, multi-stage), axial flow pumps, mixed-flow pumps, vortex pumps, etc.

Centrifugal pump - the rotating impeller is used to drive the fluid to rotate together, and the pressure energy and kinetic energy of the fluid are increased by centrifugal force. The submersible motor is directly connected to the pump impeller coaxially, and the hydraulic parts are composed of the pump casing and impeller.

Axial Flow Pump - Uses the lift generated by the airfoil blades on the impeller to increase the energy of the fluid as it rotates. Axial flow pumps are divided into vertical axial flow pumps and horizontal axial flow pumps, and the submersible motor is directly connected to the impeller of the water pump ,.. coaxially

Horizontal axial flow pump - should be a complete set of equipment and should be equipped with all installation accessories such as pipe connecting pipes, doors, guide rods, slings (lifting chains), lifting brackets and hoists, submersible cables, junction boxes (IP65) and monitoring devices.

The horizontal axial flow pump adopts the guide rod automatically combined with the fixed mode in place, and the gliding rod bracket is one of the overall components of the pump, and the full weight of the pump and the thrust generated during pumping all act on the flange of the butted outlet pipeline

The submersible internal return pump should be a horizontal single-stage structure, with a vertical single-guide rail and self-coupling installation. The impeller should be designed with a non-clogging, anti-tangle construction with a solid particle diameter of up to 120mm and a permissible length.

Mixed-flow pumps - between centrifugal and axial pumps, which utilize partly centrifugal force and partly lift. The mixed-flow pump is motor-driven, suitable for pumping primary sewage, using bottom suction, horizontal outflow, single volute, and mixed-flow vane.

2.Positive displacement pumps.

Positive displacement pumps include reciprocating pumps (pistons, plungers, diaphragms), rotary pumps (gears, screws, sliding vanes, etc.).

Reciprocating pumps - use periodic changes in working volume to transfer fluids and increase their pressure, including piston, plunger and diaphragm types.

Rotary Pump - Uses a pair or several specially shaped rotors, such as gears, screws or other shaped rotors, to make a rotational motion in the housing to transport the fluid and increase its pressure.

The main reasons for the use of self-priming pumps for sewage treatment sewage pumps are as follows:

1.Strong self-priming ability: In the process of sewage treatment, the flow rate and water level of sewage change greatly, and the self-priming sewage pump has strong self-priming ability, which can improve work efficiency to a certain extent.

2.Wide range of application: In the process of sewage treatment, the properties and composition of liquids are complex and diverse, and self-priming sewage pumps are suitable for the transportation of various liquids, including sewage, chemical liquids, etc.

3.Convenient maintenance: In the process of sewage treatment, sewage contains a large number of impurities and particles, and the self-priming sewage pump has a simple structure, convenient maintenance, and is easy to clean and repair.

4.Long service life: In the process of sewage treatment, the corrosiveness of sewage is strong, and the self-priming sewage pump is made of high-quality materials and has a long service life.

5.Easy installation: In the process of sewage treatment, the conveying distance and height of sewage are large, and the self-priming sewage pump is simple to install, and no additional suction pipes are required, which saves installation costs.

The sewage lifting pump is far less popular in the domestic market than abroad, after all, the domestic has not yet reached the range of small villas per capita. Sewage lifting pumps, in the household field, are mainly used to solve the drainage problem in the basement of the villa or the basement of a small commercial complex. So, what exactly is the sewage lift pump used for?

Sewage lifting pump, simply put, is a device that lifts and discharges sewage, using the principle of centrifugal pump to discharge sewage, and the main medium conveyed is sewage.

According to the different use scenarios, the sewage lifting pump has different classifications for household, commercial, industrial and so on

Household sewage lifting pump mainly discharges household sewage, and there are not many requirements for the material, as long as the flow rate and head can meet the corresponding drainage needs.

Commercial sewage lifting pumps, the main discharge is also domestic sewage, generally does not involve special wastewater, can be directly connected to the urban sewer pipe network. However, because of the large area of commercial premises, more people may be covered, and the requirements for flow and head will be relatively high.

Industrial sewage lifting pump, the same is to discharge sewage, but the nature of sewage is very different, according to the actual discharge of sewage nature, there may be pH requirements, in addition to the flow, head, for the material of the sewage lifting pump has higher requirements.

For general users, in fact, they are more exposed to household and commercial scenarios, mainly domestic sewage discharge. For the discharge of domestic sewage, we can select more from the flow rate and head.

Flow, that is, how much sewage needs to be discharged, generally for household use, in fact, the drainage is not large, among the major brands of machine models, there are also models specially suitable for household use, such as kitchens, toilets, washing machines, air conditioning condensate, etc., are no problem.

Head, that is, the height of sewage that needs to be raised for discharge, for household use, it is generally minus one minus two, and the floor height is about six or seven meters. Of course, the head does not refer to the consideration of height, in addition to the height, it is also necessary to consider the loss of the head caused by horizontal transmission and elbowing. In the selection, the head is suitable for the actual needs, so as to ensure smooth drainage.

Zhiliu sewage lifting pump, compared with the traditional sewage lifting pump, according to the current trend of the Internet of Things, has introduced an intelligent control system. The machine can be connected to a mobile phone for remote control, basement leakage water monitoring, and reliable for home users.