gravity
With the help of gravity and potential difference of suspension as the driving force of filtration, the pressure formed on the filter medium is generally intermittent operation, such as sanding machine.
vacuum
Negative pressure is formed at the filtrate outlet as the driving force of filtration. The absolute pressure of working vacuum of industrial vacuum filter is (2.5 ~ 8.0) × 105 Pa. The temperature of suspension during filtration should be lower than the evaporation temperature of filtrate under operating vacuum. This filter is divided into intermittent operation and continuous operation. Intermittently operated vacuum filters can filter suspensions of various concentrations. The vacuum filter fills the container shell with suspension. The filter with filter cloth wrapped on both sides is immersed in the suspension, and the inner cavity of the filter is communicated with the vacuum system. After the filtrate is sucked out, it is led out by the conduit, and the filter residue accumulated on the surface of the filter blade is removed after the machine is stopped. Continuous vacuum filter is suitable for filtering viscous suspension containing more solid particles. The working principles of drum vacuum filter, inner filter drum vacuum filter, disc vacuum filter and tipping bucket vacuum filter are similar. The whole filtering surface is divided into a plurality of independent filtering chambers, and each rotary filtering chamber is sequentially communicated with each fixed pipe through a distribution valve to suck filtrate and washing liquid out of the filtering chamber or send compressed air. Each filtering chamber rotates once to complete the whole process of filtering operation, and the operations of multiple filtering chambers are connected to form continuous filtering. The structure of belt vacuum filter is similar to that of belt conveyor, with continuous filter belt, which is suitable for suspension that is easy to filter. Belt vacuum filter, inner filter cylinder vacuum filter and tipping bucket vacuum filter all feed on the upper part of filter media (filter cloth), which is especially suitable for suspension with high solid particle density and fast settling speed.
Put pressure on
It takes the pressure exerted at the entrance of suspension or the mechanical extrusion force exerted on wet materials as the driving force for filtration, and is suitable for suspension with large pressure difference. Can also be divided into intermittent operation and continuous operation. Intermittently operated tubular pressure filters and pressurized filters are used to filter low-concentration suspensions. Filter is also a kind of intermittent pressure filter, which is divided into three types: plate-frame type, box type and vertical type, and has a wide range of uses. Oil filter is a kind of plate-and-frame filter press, equipped with oil pump, vacuum evaporator and other accessories. Continuous rotary drum pressure filter and disc pressure filter perform pressure filtration in a closed shell, and their structures are similar to those of rotary drum vacuum filter and disc vacuum filter. Because of its complex structure, it is rarely used.
The common filter press is to filter by reducing the volume of the filter chamber or applying mechanical pressure. The water content of filter residue is low, which is suitable for suspension with high solid particle concentration. In the belt filter press, the wet filter residue after preliminary dehydration by gravity or vacuum moves between two filter belts, and then is extruded and dehydrated by a roller. The spiral filter press has a cylinder with a hole, and there is a rotating spiral in the cylinder, and the depth of the spiral groove is different. The material is added from the deep groove end to the shallow groove end, the space of the filter chamber is gradually reduced, the material is compressed, the filtrate is discharged from the hole of the cylinder, and the filter residue is discharged from the small end.
precise
Precision filtration is generally between sand filtration (coarse filtration) and ultrafiltration in filtration accuracy. Under the action of pressure, raw water passes through the filter element, impurities are trapped on the wall of the filter element, and water flows out through the filter element, thus achieving the purpose of filtration. At present, the manufacturers of filtration equipment in China are mainly small and medium-sized enterprises. Products are made of high-quality stainless steel, hard PVC, engineering plastics, plexiglass and other corrosion-resistant materials, among which high-quality stainless steel is the main one, and filter elements with different media are built in. Built-in filter elements include PE core, honeycomb core, folding core, titanium tube sintered core, activated carbon core, ceramic core, polypropylene fiber filter element and so on. Different filter elements have different filtering effects, so the precision filter can remove suspended solids, some colloidal substances and fine particles in water according to the requirements of raw water quality, effluent quality and water quantity, and achieve different filtering accuracy. The filtration accuracy of precision filters in the market ranges from 0.2 to 100 um. Precision filters are often used as protective filters in electrodialysis, ion exchange, reverse osmosis, ultrafiltration and other devices, and can be applied to water treatment in food, alcohol, pharmaceutical and chemical industries, electronics and other industries, such as:
Food industry: fine filtration of mineral water, clarification and filtration of drinks and alcohol. Pharmaceutical industry: water treatment of sterile water, oral liquid, infusion and injection;
Electronics industry: pure water preparation and washing water filtration in semiconductor, instrument, kinescope and other factories;
Chemical industry: purification of organic solvents, esters, alcohols, acids, alkalis and other chemical raw materials and oils;
Environmental protection: treatment of electroplating wastewater, printing wastewater, pharmaceutical wastewater and other industrial wastewater. Water quality treatment of seawater and brackish water desalination, water supply treatment of hotels and apartments, etc.
Gardening: irrigation and maintenance of parks, courtyards, greenhouses, animal husbandry, industrial places that need artificial production of ultra-fine water mist, and high-grade flowers. Pipeline filter
Double tube filter
high pressure filter
It should be a mesh filter. In fact, there are many kinds of filters, such as laminated filter, sand rod filter, carbon filter, frame filter, activated carbon filter, diatomite filter, microporous filter and so on. The main principle is to use the pore size of the filter medium to intercept substances smaller than the pore size of the medium. Of course, some filter media also have special effects such as adsorption. The backwashing of most filters is not so troublesome. As long as clean water is introduced into the medium in the backwashing filter from one end of the filtered water, good backwashing effect can be achieved. Hydraulic oil filter: mainly used in oil filtering industry, including oil suction filter, oil return filter and pipeline filter.
Food filters: dust filters, air filters, air conditioning filters.
Medical filters: liquid filters, respiratory filters, blood filters, bacterial filters. Self-cleaning
It is a precision equipment that directly intercepts impurities in water through a filter screen, removes suspended solids and particles in water, reduces turbidity, purifies water quality, and reduces the generation of dirt, bacteria, algae and corrosion in the system, thereby purifying water quality and protecting the normal operation of other equipment in the system.
The main components are: motor, electric cabinet, control pipeline, main pipe assembly, filter element assembly, 3 16L stainless steel brush, frame assembly, transmission shaft, import and export connecting flanges, etc.
It overcomes many shortcomings, such as small pollution capacity of filtered products, easy blockage by dirt, need to disassemble and clean the filtered part, and unable to monitor the filtering state. It has the functions of filtering raw water, automatically cleaning and discharging filter elements. When cleaning and discharging sewage, the system provides uninterrupted water supply, which can monitor the working state of the filter with high degree of automation. It covers all kinds of filtering accuracy requirements from 10um to 3000um. Adopting the advanced technology of international water treatment industrial equipment, it can be installed vertically, horizontally and upside down in any direction and at any position, and can be used for water filtration in industries such as industry, agriculture, municipal power, electronics, medicine, food, printing and dyeing, construction, steel, metallurgy, paper making and so on.
full automatic
It is a set of equipment widely used in filtration industry. The traditional filter products have some shortcomings, such as small pollution capacity, easy to be blocked by dirt, the filter parts need to be disassembled and cleaned, and the filter state cannot be monitored. It has the functions of filtering raw water, automatically cleaning and discharging filter elements. It consists of a shell, a multi-element filter element, a backwashing mechanism, an electric control box, a reducer, an electric valve and a differential pressure controller. The diaphragm in the shell divides its inner cavity into an upper cavity and a lower cavity. The upper cavity is equipped with a plurality of filter elements, which makes use of the filtering space and greatly reduces the volume of the filter. The lower cavity is provided with a backwashing straw. During operation, turbid liquid enters the lower cavity of the filter through the inlet, then enters the inner cavity of the filter element through the baffle hole, impurities larger than the gap of the filter element are intercepted, and the cleaning liquid reaches the upper cavity through the gap, and finally is sent out from the outlet.
Advantages: the automatic filtration accuracy is 100 micron by default, and can be selected from 10 to 3000 micron, with large filtration area and high pollution capacity, which can be customized by users according to actual working conditions. The cleaning mode is simple, and the cleaning cycle is monitored electronically, which can realize automatic cleaning and sewage discharge. All parameters in the automatic self-cleaning filter control system can be adjusted.
Brush type
The types of stainless steel brush filters are: automatic stainless steel brush filter and manual stainless steel brush filter. Its main function is to remove suspended matter, reduce the concentration of suspended matter and particulate matter in water, reduce turbidity, purify water, reduce system dirt, bacteria, algae and rust, and purify water.
Stainless steel brush filter adopts patented internal mechanical structure, which realizes real high-pressure backwashing function, can easily and thoroughly remove impurities intercepted by the filter screen, has no dead angle in cleaning, no flow attenuation, ensures filtering efficiency and has long service life.
Stainless steel brush filter can realize automatic backwashing through its own retrieval and filtration functions, and can cope with unstable water quality fluctuations without manual intervention.
In the backwashing process of stainless steel brush filter, each filter screen (group) is backwashed in turn; Ensure that the filter screen is cleaned safely and efficiently, while other filters are not affected, and continue to filter.
Stainless steel brush filter adopts automatic blowdown valve, which has short backwashing time, less backwashing water consumption, environmental protection and economy. Less wearing parts, no consumables, low operation and maintenance cost and simple operation and maintenance management. According to the filter media, it is divided into air filtration, liquid filtration, network filtration and optical filtration.
air
Development of air filter
The prototype of air filter is a respiratory protection device that people use to protect their breathing. According to records, as early as the first century AD in Rome, people used masks made of coarse hemp for protection when purifying mercury. After a long time, air filters have also made progress, but they are mainly used as respiratory protection devices in some dangerous industries, such as the production of harmful chemicals. 1827, Brown discovered the movement law of tiny particles, and people got a better understanding of the mechanism of air filtration.
The rapid development of air filters is closely related to the development of military industry and electronic industry. During the First World War, due to the use of various chemicals, military gas masks with asbestos fiber filter paper as smoke filter layer came into being. Glass fiber filter media for air filtration was patented in the United States in June 1940. In 1950s, the United States deeply studied the production technology of glass fiber filter paper, and improved and developed the air filter. In 1960s, HEPA filter came out; In 1970s, the HEPA filter with micro-glass fiber filter paper as the filter medium had a filtration efficiency of 99.9998% for particles with a particle size of 0.65438 0.3 micron. Since 1980s, with the appearance of new testing methods, the improvement of use evaluation and the improvement of filtration performance requirements, it was found that there were serious problems in HEPA filter, so ULPA filter with higher performance was produced. Countries are still studying hard, and it is estimated that more advanced air filters will appear soon.
Air filter performance
Make the polluted air clean to the state needed for production and life, even if the air reaches a certain cleanliness. How the air filter filters the air;
General air purification equipment can roughly divide air filtration into the following methods and steps.
1, multiple filters-to prevent dust and germs from entering the room.
Multiple activated carbon filter screens can effectively intercept dust germs, filter the air and ensure that the air entering the room is clean.
2, titanium oxide antivirus-degradation of indoor air pollution of formaldehyde, benzene and other organic toxic gases.
Nano-titanium dioxide is activated by ultraviolet light, which filters the air and effectively degrades the radiation pollution of organic toxic gases such as formaldehyde and benzene in the air.
3, negative ion oxygen-increase the amount of oxygen in the indoor air to the right amount and keep the content stable.
The negative ion generator oxygenates indoor air, ensuring that the air entering the home is full of oxygen and vitality, and strengthening air filtration >:
4.PTC ceramic heating-heating indoor air to a comfortable temperature.
PTC ceramic heater can preheat the fresh air entering the room in winter, appropriately raise the indoor temperature, thus filtering the air and making the home warm and comfortable.
⒌ Ultraviolet sterilization-a powerful method to kill viruses and bacteria prevalent in the air.
Ultraviolet light source can effectively kill epidemic viruses and bacteria in the air, keep people away from the source of infection, filter the air and care for the health of the whole family.
The filter is an indispensable device in the medium conveying pipeline, which is usually installed at the inlet end of pressure reducing valve, pressure relief valve, constant water level valve or other equipment to eliminate impurities in the medium and protect the normal use of valves and equipment. When the fluid enters the filter cartridge with a certain filter screen, its impurities are blocked and clean filtrate is discharged from the filter outlet. When cleaning is needed, just take out the detachable filter element and install it after treatment, which is very convenient for use and maintenance.
Efficient air
High efficiency air filters are generally used at the filtration end, so the requirements for high efficiency filters are also the most stringent, and they need to be tested one by one before leaving the factory. As the end, the high-efficiency filter is the most critical level of filters at all levels, which requires additional "observation". The most fundamental way to prolong the service life of high efficiency filter is to leave dust in the pre-filter. Replacing the front filter generally does not need to stop production and debugging, so experienced car owners will pay attention to and spend money on the front filter. Used for 10000 and 100000 cleaning workshops. F8 filter can be selected for pre-filtration, so that the service life of the end high-efficiency filter can generally reach five years. F8 filter is the most common pre-filter for non-uniform flow clean rooms in foreign projects and new domestic projects. Chip factory 100, 10 or higher clean workshop, the common efficiency level of pre-filter is H 10, and many new projects simply choose HEPA. In the past design of clean room air conditioning system in China, the common configurations of filters are: coarse efficiency, medium efficiency and high efficiency. At that time, the service life of the high efficiency filter was only 1-3 years, and the worst was only a few months. It can be seen that the efficiency of the pre-filter determines the service life of the end filter.
liquid
Make the polluted liquid clean to the state required by production and life, even if the liquid reaches a certain cleanliness.
Common liquid filters are: integrated filtering equipment for swimming pools.
Integrated swimming pool equipment is the mainstream product choice direction of modern swimming pool industry market. Integrated swimming pool equipment has brought a brand-new impact to the swimming pool equipment market with its technical content and design concept. Swimming pool integrated equipment is a swimming pool equipment which integrates filtration, disinfection and circulation, and has become the mainstream product in the swimming pool equipment market today.
Comprehensive swimming pool equipment plays an irreplaceable role in the operation of modern swimming pools. Its features and functions are as follows:
First, it can be placed near the swimming pool with low noise and high safety factor.
Secondly, the installation is simple, the workload is reduced and the efficiency is high.
Third, it is small in size and buried underground, which can make room for beautifying the swimming pool.
network
By setting to prevent spam, make the information on the computer screen meet the requirements as much as possible.
light
The principle of absorption is to separate different colors of light and absorb some unnecessary light. Oil suction filter
The filter is installed on the suction pipeline of the pump to filter out the residual pollutants in the oil tank and the pollutants entering through the air holes, thus protecting the pump. However, in order to avoid cavitation in the pump, we must pay full attention to the pressure loss, and generally use 100-200 mesh coarse metal mesh or slotted wire material. Therefore, it is not a filter to control the pollution concentration of the system.
High pressure pipeline filter (a)
Located on the outlet pipeline of the pump, it has the function of preventing pollutants from entering the system. Therefore, the pollutant concentration of the system can be controlled. However, because it is a high-pressure main pipeline, it is impacted by the pulsation and pressure of the pump, so the material and strength of the filter element should be carefully considered.
High pressure pipeline filter (b)
In the system, this kind of filter (also called terminal filter) is installed to protect the hydraulic components that are particularly sensitive to pollution. Therefore, it tends to be smaller than other filters. So when you use it, you should choose a large capacity. In addition, the material and strength of components should be fully considered as in (a).
Reflux filter
Located on the oil return pipeline of the system, its function is to capture the pollutants generated or invaded in the system and then return to the oil tank. Therefore, it is the most effective and important filter to control the pollution concentration of the system. Although it is a low-pressure pipeline, pulsation or pressure shock may occur according to the operation of the transmission device, so the material and strength of the components should be fully considered. Imported pump
Circulating filter
The system is located in the oil return path of oil tank circulation, and has a large capacity, so it is often used when strict cleanliness is required. Even if the system doesn't work, it can intercept the pollutants in the oil tank, so the efficiency of reducing the pollution concentration is the best. In addition, a cooler is installed, which is synchronous in cooling and convenient in maintenance. However, special pumps and motors are needed and the cost is high.
air-filter
Located on the oil tank, it can prevent pollutants from mixing with air due to the change of oil quantity in the oil tank. Therefore, the filtration accuracy should be equal to or higher than that of the filter, and the capacity should be left enough room to prevent the internal pressure of the oil tank from becoming negative pressure due to plugging holes, resulting in cavitation of the pump. Pay special attention when the surrounding environment is not good.