What are the working principles and advantages and disadvantages of filter lift pumps?

When the filter is working normally, impurities will be trapped in the upstream of the filter (filter medium), and with the accumulation of impurities, the pores of the filter media will be blocked, which is directly manifested as a decrease in circulation. Normally, when the flow rate drops to a certain set point (usually judged by pressure drop in the industrial field), it is necessary to regenerate the filter media so that the media can regain its filtration capacity.

1.The working principle and structural characteristics of the filter lift pump.

The drive of the ordinary centrifugal pump is to connect the impeller shaft of the pump with the electric shaft through the coupling, so that the impeller and the motor rotate together and work, while the filter lift pump is a sealless pump, the pump and the national treasure drive motor are sealed in a pressure vessel filled with pumped medium, this pressure vessel is only statically sealed, and a wire group is used to provide a rotating magnetic field and drive the rotor. This structure eliminates the need for a rotating shaft seal with conventional centrifugal pumps, so there is no leakage.

The filter lift pump connects the pump and the motor together, the rotor of the motor and the impeller of the pump are fixed on the same shaft, and the rotor and stator of the motor are separated by the shielding sleeve, and the rotor runs in the medium to be conveyed, and its power is transmitted to the rotor through the stator magnetic field.

In addition, the manufacture of the filter lift pump is not complicated, and its hydraulic end can be designed and manufactured in accordance with the structural type usually used by centrifugal pumps and relevant standard specifications.

2.Advantages and disadvantages of filter lift pumps.

Advantages of Filtration Lift Pumps.

1) Fully enclosed. There is no dynamic seal in the structure, only a static seal at the shell of the Guobao pump, so it can achieve no leakage, especially suitable for transporting flammable, explosive, precious liquids and toxic, corrosive and radioactive liquids.

2) High security. The rotor and stator each have a shield sleeve so that the motor rotor and stator do not contact with the material, and even if the shield sleeve is broken, there will be no danger of external leakage.

3) Compact structure and less land occupation. The pump and motor are integral, and there is no need to align the center for disassembly and assembly. The requirements for the base and foundation are low, and the daily maintenance workload is small, and the maintenance cost is low.

4) Smooth operation, low noise, no need to add lubricating oil. Since there are no rolling bearings and no motor fan, there is no need to add lubricating oil and the noise is low.

5) Wide range of use. It can meet the requirements of various working conditions such as high temperature, high pressure, low temperature and high melting point.

Disadvantages of filter lift pumps.

1) Because the filter lift pump adopts sliding bearings and is lubricated with the conveyed medium, the medium with poor lubrication should not be transported by the filter lift pump. T400 030 1558 is generally suitable for filtering the viscosity of the lift pump medium.

2) The efficiency of the filter lift pump is usually lower than that of a single-acting mechanical seal centrifugal pump, but about the same as that of a double-acting mechanical seal centrifugal pump.

3) When running in the case of small flow for a long time, the efficiency of the filter lift pump is low, which will lead to heat generation, evaporate the liquid, and cause the pump to run dry, thereby damaging the sliding bearing.

The use of sewage lifting pump solves a lot of sewage discharge problems that are far away from the drainage riser and poor drainage conditions, and does not have the sewage discharge problem of self-flowing sewage discharge places. The basic parameter of sewage lift pump selection is caliber.

Confirm the amount of good flow nuclei to call quietly. Many novices don't know what the flow rate is, which refers to the amount of liquid (this amount can be volume or mass) transported by the sewage lift pump per unit of time. We often say that the chain refers to the volume, which is often expressed by l min and m h.

The flow rate is what we must confirm in the selection of sewage lifting pumps.

If the oil content in the rotten sewage is high, it is recommended to choose eddy sewage lifting equipment. In summary, the model of the sewage lift pump can be determined according to the flow rate, head, abrasive particle size or overflow diameter.

There are several aspects to consider when choosing a filtration lift pump:

1.Flow rate and head: The flow rate and head of the filter lift pump are determined according to the amount of water to be conveyed and the conveying height. Flow rate and head are two important parameters of a filter lift pump, generally speaking, the higher the flow rate and the higher the head, the larger the filter lift pump required.

2.Filter type: Select the appropriate filter lift pump according to the media and filter type to be filtered. Common types of filters are mechanical filters, screen filters, cartridge filters, etc.

3.Material: Select the appropriate material according to the nature of the conveying medium and the use environment. Generally speaking, the filter lift pump for conveying corrosive media needs to be made of corrosion-resistant materials, such as stainless steel, plastic, etc.

4.Power: The power of the filter lift pump is determined according to the amount of water to be conveyed and the head. The higher the power, the stronger the conveying capacity of the filtration and lifting liquid pump.

5.Brand and quality: Choose a well-known brand and reliable quality filter lifting pump, which can ensure the service life and performance stability of the filtration lifting pump.

6.Other special requirements: If there are special requirements, such as explosion-proof, anti-corrosion, etc., you need to choose a filter lift pump that meets the requirements.

Pump; If it is used to transport sewage or dirt, it is necessary to consider the maximum particle of the sewage pump. If the corrosion-resistant medium is transported, the corrosion-resistant pump should be considered; If the sewage contains fecal impurities, it should be considered in the shooting.

The selection basis for the sewage lifting and returning pump is based on the process flow, water supply and drainage requirements, and the flow rate, head, and liquid properties from the leakage. 1. Flow rate is one of the important data for selection, which is directly related to the production capacity of the whole device.

Due to the corrosion resistance of plastic materials, filter lifting pumps are required to use engineering plastic filtration pumps in industrial production processes for the transportation and dosing of acids such as hydrochloric acid, sulfuric acid, nitric acid, and other applications. So how to choose a filter lift pump?

First of all, it is necessary to confirm several important factors that affect the selection of filter lifting pumps: conveying medium, conveying temperature, self-priming height, flow, head, caliber, power, etc.

By conveying what medium and medium temperature, determine what pump to choose and what material to use. For example, the concentrated sulfuric acid of 98 has different chemical properties depending on the temperature. Below 30, it can be transported by an anaerobic circulating pump made of PVDF material, and more than 30 can be transported by a pump made of fluorine-lined material.

Hypochlorous acid and hypochlorite ions have strong oxidation, so a pump made of PVDF is required (a magnetic pump is recommended for hypochlorite ion solution).

According to the requirements of the self-priming height to adopt different configurations, it is generally recommended that customers install a bottom valve filter screen at the water inlet to prevent sucking debris, prevent the backflow of liquid, start again without adding water, etc., the self-priming height is about 5 meters, and a self-priming barrel needs to be installed. (Principle: The anaerobic circulating pump continuously pumps the liquid in the self-priming barrel, so that the pressure in the self-priming barrel continues to decrease, and the atmospheric pressure will press the liquid into the self-priming barrel through the inlet pipeline, so as to improve the self-priming capacity).

The flow head is the basic yard air requirement of a pump, and the flow head required by the pump can be quickly selected by comparing the flow head performance curve chart. For example, the self-priming pump that needs a head of 20m and sells a hail flow rate of 20m h, on the flow head curve, find the horizontal line of the corresponding 20m head, and the point X of the vertical line corresponding to 20m h (334L min), select a line H next to it above it, and select the corresponding pump model MA-50052 (adopt the principle of choosing large but not small).

If the diameter requirement is 40mm and there is no self-priming requirement, the mold sail can also choose the magnetic pump MNX-452 (50*40 caliber) or the chemical pump MC-40032 (40*40 caliber) according to the above method.

How to choose the type of sewage lifting pump?1. The flow rate is one of the important performance data of the sewage lifting pump, which is directly related to the production capacity and transportation capacity of the entire deviceWhen choosing a sewage lifting pump, the maximum flow rate is used as the basis, taking into account the normal flow rate, and when there is no maximum flow rate...

Filtration lift pumps are used for the transportation, lifting, and dosing of sewage, so they are widely used in medicine, chemical industry, bleaching and dyeing, electroplating, coating, etching, circuit boards, electronics, leather, fine chemicals, sewage treatment, waste gas treatment and other fields. Among them, the main application fields are: fine chemical wastewater treatment, photovoltaic wastewater treatment, printing and dyeing wastewater treatment, metal surface wastewater treatment, mechanical processing wastewater treatment, chemical wastewater treatment, pickling wastewater treatment and spraying wastewater treatment.

Filtration Lift Pump Selection Steps:

1. The basic parameters such as flow rate and head of the filter lifting pump should be reasonably determined according to the process requirements. It is generally believed that normal wear and tear of the pump and changes in speed may cause a decrease in head. Therefore, when selecting a pump, the head of the pump can be as high as 2 percent

5 percent margin, but not more than 10 percent. The basic principle is to ensure that the pump operates within the high efficiency range. In addition, by calculating the cavitation allowance of the unit, information on the inlet status of the corrosion-resistant pump can be obtained.

2. Determine the flow rate of the filter lifting pump and the distance height to be conveyed to determine the power of the pump, and the flow rate and head of the acid and alkali resistant pump are inversely proportional.

3. Determine whether the filter lift pump contains particles and impurities with high hardness, and select the shaft seal material of the acid and alkali resistant pump accordingly.

4. It is necessary to determine the installation position of the filter lifting pump, so as to determine whether the pump should have a self-priming function.

5. It is necessary to determine the temperature in order to determine the pump body material of the filter lifting pump and whether to use high-temperature bearings.

How it works.

The water to be treated by the filter enters the body through the water inlet, and the impurities in the water are deposited on the stainless steel filter screen, resulting in a pressure difference. When the differential pressure reaches the set value, the electric controller feeds the hydraulic control valve, drives the motor signal, and triggers the following actions: the motor drives the brush to rotate, cleans the filter element, and opens the control valve to drain the sewage at the same time, the whole cleaning process only needs to last tens of seconds, when the cleaning is over, the control valve is closed, the motor stops rotating, and the system returns to its initial state and begins to enter the next filtration process.

The pump filter is mainly composed of the main pipe, branch pipe, filter cartridge, flange, flange cover and fasteners, etc., when the fluid enters the filter cartridge through the main pipe, the solid impurity particles are blocked in the filter cartridge, and the clean fluid is discharged by the filter outlet through the filter cartridge. When it needs to be cleaned, rotate the screw plug at the bottom of the pipe, drain the fluid, remove the flange cover, take out the filter cartridge, and reload it after cleaning, so it is widely used in petroleum, chemical, sewage and other aspects of filtration.

The pump filter is also called the bottom valve, and there is a filter screen at one end, which is generally used in the suction port of the pump to prevent impurities from entering the pump and damaging the pump accessories, and at the same time, the water in the pump can be kept from flowing backwards when the pump is stopped, so as to avoid the problem of filling and exhausting when the pump is started again.

Hengsheng Pump BZA centrifugal pump, also known as petrochemical process pump, this series of pumps has scientific structure, stable performance and strong applicability, and is widely used in petrochemical and other fields.

Precautions for installation of filtrate lift pump operation:

1.The pump arrives at the use site after long-distance transportation, and the parts of the whole machine must be checked to see if they are intact before installation, the fasteners should be tightened, and the concentricity of the pump shaft and the motor shaft should be checked, and if there is a displacement, it should be corrected.

2.When installing, the hydraulic loss of the suction pipeline should be minimized, no elbows less than 90 ° should be installed, no more than 2 elbows of 90 ° on the inlet of the inlet pipeline, and a filter screen should be set up at the inlet of the pump to prevent large impurities from entering the pump and ensure the normal operation of the pump.

3.The connecting bolts of the inlet pipe must be tightened evenly, the seal must be tight, no air leakage, and soft flange gaskets (such as fluoroelastomers) should be used as much as possible, otherwise the self-priming performance of the pump will be seriously affected.