Method for determining size of shell of cyst filter

Abstract

The invention belongs to the technical field of filtration and separation, and provides a method for determining the size of a shell of a cyst filter, which adopts a 3D printed shell to simulate a real cyst filter element shell, and utilizes different pressures borne by the cyst filter element shells with different shell diameters to determine the size of the shell of the cyst filter. The shell size bearing the lowest pressure drop is selected as the shell of the bag type filter so as to ensure that the pressure drop borne by liquid in the bag type filter is the lowest, and no extrusion or very small extrusion force is generated before the liquid enters a filtering membrane. According to the method, firstly, a # imgabs0 # filter element with the membrane aperture of 1 micron is purchased from the market, then a series of shell upper portions and shell lower portions are subjected to 3D printing through 8228 photosensitive resin, the thickness of the shells is 4 mm, and the diameters of the shells are 70 mm, 74 mm, 78 mm, 82 mm, 86 mm and 90 mm respectively. The middle of the shell is fastened through a sealing ring and a hoop. An externally-rotating NPT threaded connector is arranged in the lower portion of the shell. Meanwhile, a spiral piece at the bottom is subjected to 3D printing. The spiral piece is matched with an external rotation NPT threaded connector arranged on the lower portion of the shell and can be pasted to the tail of a purchased product through hot melt adhesive. The sizes of the external rotation NPT threaded connector and the spiral piece are fixed. Flow tests under different pressures are carried out by using a bag type filter formed by combining purchased filter elements and shells with different diameters. A curve is obtained according to a gap between the shell and the filter element (the inner diameter of the shell minus the outer diameter of the filter element divided by 2) and flow values under different pressures. And determining the optimal shell diameter.

Description

Technical Field

[0001] The invention provides a method for determining the shell size of a bursa filter, belongs to the technical field of filtration and separation, and is widely used in pharmaceutical engineering, biotechnology, microelectronics and other related fields. Background Art

[0002] Capsule filter is a highly efficient and compact filtering device, which is widely used in pharmaceutical, biotechnology, food and beverage and chemical industries. Its design adopts advanced filtering technology to separate solid particles, microorganisms and other impurities in liquid through filter membranes of different pore sizes, ensuring the high efficiency and safety of the filtering process.

[0003] The Chinese capsule filter market has shown a steady growth in recent years. With the advancement and innovation of technology, the filtration accuracy and flow rate of capsule filters have been significantly improved. At the same time, in order to meet the needs of different industries, the specifications of filters and the types of filter media have become more diversified. However, most of the capsule filters produced in China do not pay attention to the design of the shell structure. Summary of the invention

[0004] The purpose of the present invention is to provide a method for determining the size of a capsule filter housing. A 3D printed housing is used to simulate a real capsule filter housing, and the pressures borne by capsule filter housings with different housing diameters are different, so the housing with the lowest pressure drop is selected as the capsule filter housing.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is as follows: first, The membrane pore size is 1um filter element, and then a series of upper and lower shells are 3D printed using 8228 photosensitive resin. The shell thickness is 4mm and the diameters are 70, 74, 78, 82, 86, and 90mm respectively. The middle of the shell is fastened with a sealing ring and a clamp. An externally rotating NPT threaded interface is set in the lower part of the shell. At the same time, a spiral part is 3D printed at the bottom. The spiral part matches the externally rotating NPT threaded interface set in the lower part of the shell, and can be attached to the tail of the purchased Pall product by hot melt adhesive. The size of the externally rotating NPT threaded interface and the spiral part are fixed.

[0006] Use the purchased filter element and capsule filters with different shell diameters to test the flow rate under different pressures. Draw a curve based on the gap between the shell and the filter element (shell inner diameter minus filter element outer diameter divided by 2) and the flow rate under different pressures. Determine the optimal shell diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a picture of the Nang filter element purchased by the present invention.

[0008] Figure 2 It is a schematic diagram of the upper structure of the shell printed by 3D printing of the present invention.

[0009] Figure 3 It is a schematic diagram of the lower structure of the shell printed by 3D printing of the present invention.

[0010] Figure 4 It is a schematic diagram of the structure of the spiral part matched with the internal thread of the lower part of the shell by 3D printing of the present invention.

[0011] Figure 5 It is a schematic diagram of the structure of a sealing ring placed in the middle of the connection between the upper and lower parts of the 3D printed shell of the present invention.

[0012] Figure 6 It is a picture of a clamp placed externally in the middle portion connecting the upper and lower parts of the 3D printed shell of the present invention.

[0013] Figure 7 It is a diagram of a circulating waterway pipeline system constructed in the present invention.

[0014] Figure 8 The present invention provides a curve of the gap between the housing and the filter element and the flow rate under different pressures. DETAILED DESCRIPTION

[0015] The method for determining the size of the capsule filter housing in the present application will be described in detail below in conjunction with the examples, but those skilled in the art will understand that the following examples are only used to illustrate the present application and should not be considered to limit the scope of the present application. If no specific conditions are specified in the examples, the conventional conditions are followed. The instruments and reagents used are conventional products if the manufacturers are not specified.

[0016] Embodiment:

[0017] 1. Use centrifugal pumps, pipes, valves, flow meters, pressure gauges and water storage tanks to build a circulating piping system.

[0018] 2. Assemble the capsule filter: Put the spiral piece (see Figure 4 ) Use hot melt glue to stick to the bottom of the purchased Nangshi filter element (see Figure 1 ), screw the firmly glued assembly into the lower part of the 3D printed housing (see Figure 3 ) in the NPT screw interface, using the 3D printed upper shell (see Figure 2 ) is connected to the lower part of the assembled shell, and a sealing ring is placed in the middle (see Figure 5 ) with clamp (see Figure 6 ) and tighten. Place in water and moisten for 1 hour.

[0019] 3. Connect the wetted assembled capsule filter to the piping system described in item 1 above, at the rear end of the flow meter and pressure gauge.

[0020] 4. Fill the water tank with water, turn on the centrifugal pump to circulate the pipeline, first exhaust the assembled capsule filter and fill it with water, then adjust the water inlet flow and pressure value by changing the size of the valve, and read the water inlet flow value at different pressure values.

[0021] 5. The last data uses the standard specified in GB / T 36386-2018 "Technical Requirements for Sanitary Filter Housings for Microporous Membrane Filter Elements" and the metal shell diameter currently used by the industry is 97.4mm. It is approximately assumed that its outer cylinder has no flow restriction on the fluid passing through it.

[0022] 6. Through calculation, the shell thickness is 4mm, and the diameters are: 70, 74, 78, 82, 86, 90mm. The distance from the shell to the filter element sleeve corresponding to the shell is: (shell diameter-2*wall thickness-56) / 2

[0023] The data are 3mm, 5mm, 7mm, 9mm, 11mm, and 13mm respectively. The diameter of the metal shell is 97.4mm, and the distance between the shell and the filter element outer sleeve is 20.7. The gap between the shell and the filter element and the flow value under different pressures are shown in the following table:

[0024] Table 1 Relationship between the gap between the housing and the filter element and the flow value under different pressures

[0025] Distance from housing to filter element outer sleeve 10kpa flow 15kpa flow 20kpa flow Unit: mm (filter cartridge diameter 56) L / m L / m L / m 20.7 11.9 17.365 22.465 13 11.555 18.28 25.525 11 12.51 19.27 25.85 9 13.79 20.105 26.225 7 11.275 16.12 24.095 5 9.025 13.315 18.895 3 8.655 12.835 17.215

[0026] 7. According to the above table and picture information, determine The optimal gap between the filter housing and the filter outer sleeve is 9mm, and the corresponding housing diameter is 82mm. The final housing diameter (excluding the vent valve and the joint) is 82mm.

Claims

1. A method for determining the size of a filter housing, characterized in that A 3D printed shell is used to simulate the real capsule filter shell. Taking advantage of the different pressures borne by capsule filter shells with different shell diameters, the shell size that can withstand the lowest pressure drop is selected as the shell of the capsule filter.

2. The printing material used for the 3D printed housing according to claim 1 is light green 8228 photosensitive resin and / or other pressure-resistant resin.

3. The wall thickness of the 3D printed housing according to claim 1 is 4 mm and / or other pressure-resistant wall thickness.

4. The outer diameters of the 3D printed housing according to claim 1 are: 70, 74, 78, 82, 86, 90 mm and / or other similar values ​​presenting a gradient data range.

5. The 3D printed housing according to claim 1 further comprises a spiral member at the bottom.

6. According to claim 1, the capsule filter housings with different housing diameters are subjected to different pressures, and the housing size that can withstand the lowest pressure drop is selected as the housing of the capsule filter. The specific method is as follows: First purchased from the market The membrane pore size is 1um filter element, and then a series of upper and lower shells are 3D printed using 8228 photosensitive resin. The shell thickness is 4mm and the diameters are 70, 74, 78, 82, 86, and 90mm respectively. The middle of the shell is fastened with a sealing ring and a clamp. An externally rotating NPT threaded interface is set in the lower part of the shell. At the same time, a spiral part is 3D printed at the bottom. The spiral part matches the externally rotating NPT threaded interface set in the lower part of the shell, and can be attached to the tail of the purchased product by hot melt adhesive. The size of the externally rotating NPT threaded interface and the spiral part are fixed. Flow tests at different pressures were performed using capsule filters composed of purchased filter elements and different housing diameters. The curve is obtained based on the gap between the housing and the filter element (housing inner diameter minus filter element outer diameter divided by 2) and the flow value under different pressures. The optimal housing diameter is determined.

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