Laboratory-grade magnetic stirring ultrafiltration device

Abstract

The utility model discloses a laboratory-grade magnetic stirring ultrafiltration device which comprises a transparent cup body made of high borosilicate glass, an upper cover made of stainless steel, a lower cover made of stainless steel, a magnetic stirring mechanism, a pressing mechanism made of stainless steel and an ultrafiltration membrane assembly. The utility model has the advantages of acid and alkali resistance, high filtering speed, long service life, reasonable structure, convenience in use and the like, and can be widely applied to filtering feed liquids such as drinking water, sewage treatment, seawater desalination, protein, nucleic acid, virus, nano materials and the like.

Description

Technical Field

[0001] The utility model specifically relates to a laboratory-level magnetic stirring ultrafiltration device. Background Art

[0002] Currently, membranes are widely used in various industries such as water treatment, food and beverage, chemical industry, biology, and medicine, and have a large number of applications from laboratory to industrial-scale applications. At present, membranes can be divided into microfiltration, ultrafiltration, nanofiltration, and reverse osmosis according to pore size. The smaller the pore size, the greater the required membrane operating pressure. The industrial-scale application of membranes often comes from laboratory foundations. At present, laboratory filters of organic filter membranes generally use negative pressure suction filtration. This filtration method has a low operating pressure and is only suitable for microfiltration membranes. For ultrafiltration and low-pressure nanofiltration with smaller pore sizes, negative pressure suction filtration has extremely low experimental efficiency due to too low operating pressure.

[0003] Ultrafiltration membranes and low-pressure nanofiltration membranes are in great demand in laboratory occasions such as environmental science and engineering, wastewater treatment, water purification, material research and preparation, membrane material development, membrane performance testing, biomedicine, small molecule APIs, food and beverages, and analytical laboratory sample preparation. The amount of liquid is small, and high recovery rate and high experimental efficiency goals need to be achieved. Filters with higher operating pressures can meet the requirements of ultrafiltration membranes and low-pressure nanofiltration membranes, thus forming a product that uses compressed gas (air compressor or gas cylinder) as a driving membrane filter - ultrafiltration device.

[0004] In the prior art, there are two main types of laboratory-level ultrafiltration devices. One is a plastic ultrafiltration device. The plastic ultrafiltration device mainly has the advantage of being lightweight, but its various components are all molded, which is costly, and the components are easily damaged, and the plastic is easily deformed, resulting in poor air tightness, inconvenient cleaning during use, and inability to perform high-temperature sterilization and reuse. The other is a chemical solvent-resistant stirring ultrafiltration device that uses materials such as stainless steel and high borosilicate glass. It can be manufactured by mechanical processing, and the material cost is relatively high. It does not require a mold, and is suitable for single manufacturing, suitable for organic solvent filtration and high-temperature steam sterilization. However, the lower end of its stirring device uses a pull rod and a magnetic stirring rotor for an integral PTFE-coated one-piece structure, and the structure is relatively complex to manufacture. In addition, a low-resistance bearing is required at the upper end, and the bearing needs to be a self-lubricating low-resistance type, which increases the difficulty of selection and structure. During use, the bearing must be prevented from contacting the feed liquid, otherwise it will easily affect the rotation performance, and the resistance will increase or get stuck during stirring and cannot rotate and stir. Utility Model Content

[0005] The utility model aims to overcome the defects of the prior art and provide a laboratory-level magnetic stirring ultrafiltration device.

[0006] The technical solution of the utility model is as follows:

[0007] A laboratory-level magnetic stirring ultrafiltration device comprises a transparent cup body made of high borosilicate glass, an upper cover made of stainless steel, a lower cover made of stainless steel, a magnetic stirring mechanism, a pressing mechanism made of stainless steel and an ultrafiltration membrane assembly.

[0008] The transparent cup body has an upper opening and a lower opening.

[0009] The upper cover has a top wall with a feeding port, an air inlet and a pressure relief port, the feeding port is equipped with a sealing cock, the air inlet is equipped with an air inlet quick plug connector, and the pressure relief port is equipped with a pressure relief valve;

[0010] The lower cover has a side wall with a discharge port, and the discharge port is equipped with a discharge quick plug connector;

[0011] The magnetic stirring mechanism comprises a stainless steel pull rod, a stainless steel shoulder bolt and a PTFE-coated magnetic stirring rotor, one end of the pull rod has an internal thread, the shoulder bolt is adapted to be connected with the internal thread, and the magnetic stirring rotor is rotatably sleeved on the shoulder bolt;

[0012] The upper cover and the lower cover are respectively sealed on the upper opening and the lower opening of the transparent cup body through a clamping mechanism, the magnetic stirring mechanism is arranged in the inner cavity of the transparent cup body, the other end of the pull rod is connected to the upper cover, the ultrafiltration membrane assembly is installed in the lower cover so that the inner cavity of the transparent cup body is connected with the discharge port through the ultrafiltration membrane assembly, and there is a gap between the magnetic stirring rotor and the ultrafiltration membrane assembly.

[0013] In a preferred embodiment of the present invention, the upper cover has an annular groove, and the annular groove is adapted to the upper opening of the transparent cup body.

[0014] Further preferably, an upper sealing ring is provided in the annular groove, so that the upper opening of the transparent cup body is adapted to the annular groove through the upper sealing ring.

[0015] In a preferred embodiment of the present invention, the lower cover is provided with an annular stepped structure, and the annular stepped structure is adapted to the lower opening of the transparent cup body.

[0016] Further preferably, a lower sealing ring is provided in the annular stepped structure, so that the lower opening of the transparent cup body is adapted to the annular stepped structure through the lower sealing ring.

[0017] In a preferred embodiment of the present invention, the ultrafiltration membrane assembly is a ceramic ultrafiltration membrane assembly or an organic ultrafiltration membrane assembly.

[0018] In a preferred embodiment of the present invention, the magnetic stirring rotor is in the shape of a circular crosshead.

[0019] In a preferred embodiment of the utility model, the clamping mechanism includes at least three double-headed screws, which are evenly arranged along the peripheral wall of the transparent cup body at equal intervals, and the upper ends thereof penetrate the upper cover and are matched one by one with at least three plum blossom hand-tightening nuts made of stainless steel, and the lower ends thereof are threadedly connected to the lower cover.

[0020] The beneficial effects of the utility model are:

[0021] 1. The utility model uses reusable materials such as stainless steel and high borosilicate glass to overcome the defects of easy deformation and leakage of plastics, and has lower cost and is more environmentally friendly than plastic ultrafiltration cup mold manufacturing; stainless steel materials and high borosilicate glass have high strength, good thermal stability and excellent corrosion resistance, which ensure the stability and durability of the utility model during use, and are suitable for organic solvent filtration and high-temperature steam sterilization, and high borosilicate glass has good transparency, which is convenient for observing the filtration process and real-time monitoring of the filtrate status.

[0022] 2. The utility model adopts a split design of the pull rod and the magnetic rotor. The magnetic stirrer is hollow and coated with PTFE, which has the characteristic of self-lubrication. It forms a sliding bearing stirring structure with the shoulder bolt at one end of the pull rod. Compared with the existing ultrafiltration stirring device, the bearing design at the upper end of the pull rod is cancelled, the stirring speed is improved, the structure is simpler, the rotation is stable and reliable, and the stirring effect will not be affected by the contamination of the bearing by the liquid.

[0023] 3. The utility model retains a gap between the magnetic stirring rotor and the membrane surface of the ultrafiltration membrane assembly. The stirring bar adopts a circular crosshead stirring bar, which has a better stirring effect than the conventional stirring bar, greatly reduces the concentration polarization of the membrane, and is conducive to improving the filtration flux.

[0024] 4. The utility model is acid and alkali resistant, has the advantages of fast filtration speed, long service life, reasonable structure, easy use, etc., and can be widely used in the filtration of drinking water, sewage treatment, seawater desalination, protein, nucleic acid, virus, nanomaterials and other liquids. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure decomposition of the utility model.

[0026] Figure 2 It is a three-dimensional structural schematic diagram of the utility model.

[0027] Figure 3 It is a front view of the utility model.

[0028] Figure 4 for Figure 3 AA section view; DETAILED DESCRIPTION

[0029] The technical solution of the present utility model is further illustrated and described below through specific implementation modes in combination with the accompanying drawings.

[0030] like Figures 1 to 4 As shown, a laboratory-level magnetic stirring ultrafiltration device includes a transparent cup body 1 made of high borosilicate glass, an upper cover 2 made of stainless steel, a lower cover 3 made of stainless steel, a magnetic stirring mechanism 4, a pressing mechanism 5 made of stainless steel and an ultrafiltration membrane assembly 6.

[0031] The transparent cup body 1 has an upper opening and a lower opening.

[0032] The upper cover 2 has an annular groove 20, and its top wall has a feeding port 21, an air inlet 22 and a pressure relief port 23. The annular groove 20 has an upper sealing ring 201 (the material is preferably corrosion-resistant fluororubber, silicone rubber or polytetrafluoroethylene), the feeding port 21 is equipped with a sealing cock 211, the air inlet 22 is equipped with an air inlet quick connector 221 for connecting to an external air source, and the pressure relief port 23 is equipped with a pressure relief valve 231 (when the pressure exceeds or the filtration is finished, the pressure is released to protect the safety of the operator and the ultrafiltration cup);

[0033] The lower cover 3 has an annular stepped structure 30, and its side wall has a discharge port 31. A lower sealing ring 301 (preferably made of corrosion-resistant fluororubber, silicone rubber or polytetrafluoroethylene) is provided in the annular stepped structure 30. The discharge port 31 is equipped with a discharge quick-connect fitting 311, which allows the obtained filtrate to flow into a fixed storage container through the extension of a hose. Preferably, the inner bottom surface of the lower cover 3 is inclined so that the liquid flows to the discharge port 31 under the action of gravity.

[0034] like Figure 4 As shown, the magnetic stirring mechanism 4 includes a stainless steel tie rod 41, a stainless steel shoulder bolt 42 and a PTFE-coated magnetic stirring rotor 43 (circular cross head shape, diameter 28-35 mm), one end of the tie rod 41 has an internal thread, the shoulder bolt 42 is adapted to be connected with the internal thread, and the magnetic stirring rotor 43 is rotatably sleeved on the shoulder bolt 42;

[0035] The ultrafiltration membrane assembly 6 is a ceramic ultrafiltration membrane assembly 6 or an organic ultrafiltration membrane assembly 6. When it is a ceramic ultrafiltration membrane assembly 6, a whole piece of ceramic ultrafiltration membrane fits into the inner cavity of the lower cover 3; Figure 1 and Figure 4 As shown, when it is an organic ultrafiltration membrane assembly 6, it includes an organic ultrafiltration membrane sheet 61 and a titanium foam 62 (pore size is preferably 10-40 μm) stacked up and down.

[0036] like Figure 1As shown, the clamping mechanism 5 includes three double-headed screws 51, which are evenly arranged at equal intervals along the peripheral wall of the transparent cup body 1, and the upper ends thereof penetrate the upper cover 2 and are tightened one by one with three plum-shaped hand-tightening nuts 52 made of stainless steel, and the lower ends thereof are threadedly connected to the lower cover 3, thereby ensuring that the entire interior of the cup body is reliably sealed.

[0037] like Figures 1 to 4 As shown, the upper cover 2 and the lower cover 3 are respectively sealed on the upper opening and the lower opening of the transparent cup body 1 through the clamping mechanism 5, wherein the annular groove 20 is sealed and adapted with the upper opening of the transparent cup body 1 through the upper sealing ring 201, and the annular step structure 30 is sealed and adapted with the lower opening of the transparent cup body 1 through the lower sealing ring 301, and the magnetic stirring mechanism 4 is arranged in the inner cavity of the transparent cup body 1, and the other end of the above-mentioned pull rod 41 is connected to the upper cover 2, and the ultrafiltration membrane assembly 6 is installed in the lower cover 3 so that the inner cavity of the transparent cup body 1 is connected with the discharge port 31 through the ultrafiltration membrane assembly 6, and there is a gap between the magnetic stirring rotor 43 and the ultrafiltration membrane assembly 6, and the magnetic stirring rotor 43 needs to be driven by a magnetic stirrer, and it is stable and flexible without jamming during the rotation and stirring process.

[0038] The working process of the utility model is as follows: the solution to be filtered is added from the feeding port 21, and after the solution is added, the sealing plug 211 is used to seal to ensure that the cup body has sufficient pressure for filtration and the solution will not overflow from the feeding port 21; the gas from the external gas source enters the transparent cup body 1 through the air inlet quick plug connector 221, driving the solution to be filtered to be filtered through the ultrafiltration membrane assembly 6 under the stirring of the magnetic stirring mechanism 4, and the filtrate flows into the fixed storage container through the discharge quick plug connector 311 of the discharge port 31.

[0039] The above is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of implementation of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. A laboratory-grade magnetic stirring ultrafiltration device, characterized in that: It includes a transparent cup body made of high borosilicate glass, an upper cover made of stainless steel, a lower cover made of stainless steel, a magnetic stirring mechanism, a pressing mechanism made of stainless steel and an ultrafiltration membrane assembly. The transparent cup body has an upper opening and a lower opening. The upper cover has a top wall with a feeding port, an air inlet and a pressure relief port, the feeding port is equipped with a sealing cock, the air inlet is equipped with an air inlet quick plug connector, and the pressure relief port is equipped with a pressure relief valve; The lower cover has a side wall with a discharge port, and the discharge port is equipped with a discharge quick plug connector; The magnetic stirring mechanism comprises a stainless steel pull rod, a stainless steel shoulder bolt and a PTFE-coated magnetic stirring rotor, one end of the pull rod has an internal thread, the shoulder bolt is adapted to be connected with the internal thread, and the magnetic stirring rotor is rotatably sleeved on the shoulder bolt; The upper cover and the lower cover are respectively sealed on the upper opening and the lower opening of the transparent cup body through a clamping mechanism, the magnetic stirring mechanism is arranged in the inner cavity of the transparent cup body, the other end of the pull rod is connected to the upper cover, the ultrafiltration membrane assembly is installed in the lower cover so that the inner cavity of the transparent cup body is connected with the discharge port through the ultrafiltration membrane assembly, and there is a gap between the magnetic stirring rotor and the ultrafiltration membrane assembly.

2. A laboratory-grade magnetic stirring ultrafiltration device as claimed in claim 1, characterized in that: The upper cover has an annular groove, which is matched with the upper opening of the transparent cup body.

3. A laboratory-grade magnetic stirring ultrafiltration device as claimed in claim 2, characterized in that: An upper sealing ring is arranged in the annular groove, so that the upper opening of the transparent cup body is adapted to the annular groove through the upper sealing ring.

4. A laboratory-grade magnetic stirring ultrafiltration device as claimed in claim 1, characterized in that: The lower cover is provided with an annular stepped structure, and the annular stepped structure is adapted to the lower opening of the transparent cup body.

5. A laboratory-grade magnetic stirring ultrafiltration device as claimed in claim 4, characterized in that: A lower sealing ring is arranged inside the annular stepped structure, so that the lower opening of the transparent cup body is adapted to the annular stepped structure through the lower sealing ring.

6. A laboratory-grade magnetic stirring ultrafiltration device as claimed in claim 1, characterized in that: The ultrafiltration membrane assembly is a ceramic ultrafiltration membrane assembly or an organic ultrafiltration membrane assembly.

7. A laboratory-grade magnetic stirring ultrafiltration device as claimed in claim 1, characterized in that: The magnetic stirring rotor is in the shape of a circular crosshead.

8. A laboratory-grade magnetic stirring ultrafiltration device according to any one of claims 1 to 7, characterized in that: The clamping mechanism includes at least three double-headed screws, which are evenly arranged along the peripheral wall of the transparent cup body at equal intervals. The upper ends of the screws penetrate the upper cover and are matched with at least three plum-shaped hand-tightening nuts made of stainless steel one by one, and the lower ends are threadedly connected to the lower cover.

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