Overview
The integrally molded bag filter is a widely used filtration equipment in numerous industries. With its unique structure and excellent filtration performance, it plays an important role in the field of liquid filtration. It can effectively remove suspended solids, particulate impurities, colloids, and some microorganisms in liquids, ensuring the purity of the filtered liquid and meeting the requirements for liquid quality in different production processes, domestic water use, and various special application scenarios. It is commonly found in industries such as chemical engineering, pharmaceuticals, food and beverages, electronics, and environmental protection.
Working Principle
I. Liquid Inflow Stage:
The liquid to be filtered enters the interior of the integrally molded bag filter through the inlet pipe, relying on its own gravity or external pumping pressure. After entering, the liquid will first pass through a liquid distribution device, which can evenly distribute the liquid around the filter bag of the filter, avoiding the influence on the filtration effect due to the local liquid flow velocity being too fast or too slow, and ensuring that the liquid can comprehensively and smoothly contact the filter bag for filtration.
II. Filtration Process Stage:
The core component of the integrally molded bag filter is the filter bag. The filter bag is usually made of high-strength, chemically resistant fiber materials or special filtering materials, and it is manufactured by an integrally molded process without splicing seams. This effectively avoids problems such as leakage and incomplete filtration caused by seams. The filter bag has a specific pore size. When the liquid flows through the filter bag, impurities with particle sizes larger than the pore size of the filter bag will be intercepted inside the filter bag, while the clean liquid can penetrate through the pores of the filter bag and be discharged from the outlet of the filter, realizing the separation of the liquid and impurities and achieving the purpose of filtration.
III. Filter Bag Replacement Stage:
As the filtration continues, more and more impurities will be retained in the filter bag. When the filtration resistance of the filter bag increases to a certain extent (such as when the pressure difference between the inlet and outlet reaches the set value or the filtration flow rate drops significantly), it means that the filtration capacity of the filter bag has decreased, and it needs to be replaced. The operation of replacing the filter bag is relatively simple. First, close the valves at the inlet and outlet to cut off the inflow and outflow of the liquid. Then open the cover of the filter housing (usually with a convenient opening method for easy operation), take out the old filter bag, put in a new filter bag, close the housing cover, and open the valves. Then the filter can resume its normal working state and continue to filter the liquid.
IV. Daily Maintenance Stage:
During the daily operation process, in addition to paying attention to the usage of the filter bag and replacing it in a timely manner, it is also necessary to regularly check whether the filter housing has leakage, whether the inlet and outlet pipes, valves and other components are working normally, and whether the sealing is good, to ensure the stable operation of the entire filtration system. Meanwhile, according to the properties of different filtered liquids and process requirements, reasonably selecting the appropriate filter bag material and pore size specification is also a key factor in ensuring the filtration effect and the long-term stable operation of the equipment.
Performance Characteristics
I. High-Efficiency Filtration Performance:
It has a good interception ability for impurities of different particle sizes, and can accurately intercept the impurities in the liquid in the filter bag, making the filtered liquid have a high purity. It can effectively reduce the adverse effects caused by impurities in subsequent process steps. For example, in the pharmaceutical industry, it can prevent impurities from mixing into drugs and affecting the efficacy and quality of drugs. In the electronics industry, it can avoid damage to precision electronic components caused by impurities.
II. Obvious Structural Advantages:
The integrally molded design of the filter bag ensures the integrity and sealing of the overall structure. Compared with traditional spliced filter bags, it can more effectively prevent liquid leakage and the situation where impurities bypass the filter bag, greatly improving the reliability of filtration. Moreover, the overall structure of the filter is compact, occupying a small space, which is convenient for layout and use in various installation environments.
III. Simple and Convenient Operation:
The operation process of the equipment is simple. Operators can master basic operations such as starting, stopping, filter bag replacement, and daily maintenance after simple training, without the need for complicated professional skills and tools. In particular, the process of replacing the filter bag is quick and convenient, which can be completed in a short time, minimizing the downtime of the equipment and ensuring the continuity of production.
IV. Wide Adaptability:
It can handle multiple liquids with different properties. Whether it is acidic, alkaline or neutral liquids, whether it is organic solvents, aqueous solutions or other special chemical liquids, as long as there are impurities in the liquid that need to be removed, the integrally molded bag filter can be applied. Moreover, under different working conditions such as temperature and pressure, as long as they are within a reasonable range, it can stably play its filtering role and shows strong universality.
V. Good Cost-Effectiveness:
On the one hand, the purchase cost of the integrally molded bag filter itself is relatively reasonable. Compared with some high-end and complex filtration equipment, its price is more affordable, which can save enterprises' expenses on equipment procurement. On the other hand, the cost of the filter bag has multiple options according to different materials and specifications. It can be flexibly selected according to actual needs, and the filter bag replacement is relatively simple. In the long run, on the basis of ensuring a good filtration effect, it has good cost-effectiveness.
Structural Components
I. Housing:
The housing is generally made of materials such as stainless steel and engineering plastics and formed through welding, injection molding and other processes. It has good sealing performance and can effectively prevent liquid leakage during the filtration process. At the same time, it has sufficient strength to bear the pressure of the internal liquid and possible external impact forces. The shape of the housing is commonly cylindrical, square, etc., and its appearance is usually treated with anti-corrosion and anti-rust measures to make it more beautiful and convenient for cleaning and maintenance.
II. Filter Bag:
As mentioned above, the filter bag is the key component for realizing the filtration function. It is made by an integrally molded process, and the material is selected according to different filtration requirements, such as polyester fiber, polypropylene fiber, etc. Its pore size can be customized according to the required filtration accuracy, and there are multiple specifications available to meet the requirements of different industries and different processes for liquid filtration.
III. Liquid Distribution Device:
The liquid distribution device is located near the inlet end inside the filter housing. Its function is to evenly disperse the incoming liquid around the filter bag, so that the liquid can evenly pass through the filter bag for filtration. Common forms of the liquid distribution device include perforated plates and nozzles. Through reasonable design and layout, it ensures the even distribution of the liquid on the surface of the filter bag and improves the filtration effect.
IV. Inlet and Outlet Pipes and Valves:
The inlet pipe is responsible for introducing the liquid to be filtered into the interior of the filter. The diameter of the inlet pipe is designed according to the actual flow demand and is connected to the external liquid transmission pipe by an appropriate connection method (such as flange connection, threaded connection, etc.) to ensure that the liquid can enter smoothly. The outlet pipe is used to discharge the filtered clean liquid. The same needs to consider the matching of the pipe diameter and flow rate and the convenience of connection with the subsequent pipe. Valves are installed on the inlet and outlet pipes to control the inflow and outflow of the liquid. Through the opening and closing operations of the valves, the start, stop and flow regulation of the filtration process can be realized.
Application Cases
I. Chemical Industry:
In chemical production, liquid materials such as raw material liquids, intermediate products, and final finished products often need to undergo strict filtration treatment to remove impurities and particles to ensure product quality and the smooth progress of subsequent processes. The integrally molded bag filter can filter various chemical liquids. For example, in the production of coatings, it can effectively filter out large particulate impurities in pigments and undissolved solid components, making the texture of the coatings more uniform and fine, and improving the quality of the products.
II. Pharmaceutical Industry:
The pharmaceutical process has extremely high requirements for the purity of liquids. Whether it is the extraction and preparation of active pharmaceutical ingredients or the filling of final drugs, impurities are not allowed to be mixed in. The integrally molded bag filter is applied in the filtration of pharmaceutical water, drug solutions, etc., and can intercept particles in water, bacteria, and insoluble impurities in drug solutions, ensuring the safety and effectiveness of drugs and conforming to the strict regulations of drug production.
III. Food and Beverage Industry:
In the production process of food and beverages, raw liquid materials such as raw water, syrup, and fruit juice need to be filtered to ensure the taste, appearance, and hygienic quality of the products. For example, in the production of fruit juice, the integrally molded bag filter can remove impurities such as fruit pulp residues, fibers, and possible microorganisms in the fruit juice, making the fruit juice clearer and more delicious, meeting consumers' expectations for high-quality food and beverages, and helping enterprises to establish a good brand image.
IV. Electronics Industry:
The manufacturing of electronic components has extremely high requirements for the purity of the production environment and the liquids used. Even tiny impurities can cause problems such as short circuits and failures of electronic components. The integrally molded bag filter can be used to filter liquids such as cleaning solutions and etching solutions in the electronics industry, removing particulate impurities therein, creating a clean liquid environment for the high-precision production of electronic components, and ensuring the quality and performance of the products.
V. Environmental Protection Industry:
In the fields of sewage treatment and reclaimed water reuse in the environmental protection industry, the integrally molded bag filter can intercept suspended solids and some colloids in sewage, reducing the burden of subsequent advanced treatment processes, improving the efficiency and effect of sewage treatment, and helping with the recycling of water resources and environmental protection
