Laboratory ultrafiltration cup

Abstract

The application provides a laboratory ultrafiltration cup. The cup is made of transparent organic glass, stainless steel and rubber, and comprises a detachable shell and a detachable membrane assembly. The shell is fixed by a stainless steel screw rod and a nut after being punched on the thickness surface. The stirring rod is fixed on the top of the shell and connected with an external motor. The membrane assembly is composed of a bottom supporting member, a membrane supporting member, a two-chamber sealing ring, a membrane supporting sieve plate, a membrane pressing sealing ring and a membrane pressing member. The membrane supporting member is supported by the bottom supporting member. The two-chamber sealing ring is embedded in the outer groove of the membrane supporting member, used for sealing and closely contacting with the feed liquid shell, and divides the inner space into two chambers, realizing the function of the separable membrane assembly. The filter membrane is placed on the membrane supporting sieve plate, compacted by the membrane pressing sealing ring embedded in the inner groove of the membrane pressing member, fixed on the bottom supporting member, and connected by the stainless steel screw. The two members are fixed by the membrane pressing nut. Finally, the sieve plate sealing ring embedded in the inner groove of the membrane supporting member seals the two members, forming a closed space, and provides good conditions for cross-flow filtration.

Description

Technical Field

[0001] This invention relates to the field of ultrafiltration water treatment technology, and more particularly to a laboratory ultrafiltration cup. Background Technology

[0002] Currently, membrane technology is widely used in various fields of people's lives, including food, chemical industry, environment, and energy. Among the many types of membrane products, ultrafiltration membranes (typical ultrafiltration membranes: average pore size 10 nanometers, molecular weight cutoff 100,000 Daltons) are used most frequently. Ultrafiltration (UF) is a membrane separation technology that can purify and separate solutions. An ultrafiltration membrane system is a solution separation device that uses ultrafiltration membrane fibers as the filter medium and the pressure difference across the membrane as the driving force. Ultrafiltration membranes only allow solvents (such as water molecules), inorganic salts, and small organic molecules in the solution to permeate, while retaining large molecules such as suspended solids, colloids, proteins, and microorganisms, thereby achieving the purpose of purification and separation. Compared with traditional separation methods, ultrafiltration technology has the following characteristics: The ultrafiltration process is carried out at room temperature, under mild conditions with no component damage, making it particularly suitable for the separation, fractionation, concentration, and enrichment of heat-sensitive substances such as drugs, enzymes, and fruit juices; the ultrafiltration process does not involve phase changes, requires no heating, consumes little energy, requires no added chemical reagents, and is pollution-free, making it an energy-saving and environmentally friendly separation technology; ultrafiltration technology has high separation efficiency, and is very effective in recovering trace components from dilute solutions and concentrating low-concentration solutions; the ultrafiltration process uses only pressure as the driving force for membrane separation, therefore the separation device is simple, the process is short, operation is simple, and it is easy to control and maintain; however, ultrafiltration also has certain limitations. It cannot directly produce dry powder preparations. For protein solutions, it can generally only obtain a concentration of 10-50%.

[0003] In terms of application size, besides curtain, spiral, and hollow fiber membranes suitable for large-volume filtration in water plants and factories, small sheet membranes are also widely used in fine chemical industries and laboratories. Industrialized hollow fiber and spiral wound membrane modules are not only more complex to manufacture than sheet membranes, but also require more sophisticated structural designs and are more difficult to maintain. Regardless of size, membranes must be used in specially designed membrane modules, and ultrafiltration cups are a common type of membrane module developed for small sheet membranes. Currently, most ultrafiltration cups on the market are designed for small sheet membranes using organic materials. There are two common types of laboratory ultrafiltration cups on the market: one is the Millipore Amicon ultrafiltration cup, which, while having excellent performance and sealing, is generally very expensive and unsuitable for general laboratory use by students. Furthermore, its stirring rod design can easily damage the membrane or its attached materials, making it unsuitable for long-term laboratory use. Another type is the Chinese-made imitation ultrafiltration cup, which is modeled after the American ultrafiltration cup. Although it is very inexpensive, due to material limitations, it is prone to internal oxidation and corrosion, reducing the airtightness of the ultrafiltration cup. Therefore, to solve the above problems, this design invention not only uses plexiglass in its materials, but also adopts stainless steel and rubber materials for the internal structure. This not only solves the shortcomings of the aforementioned ultrafiltration cups, but also makes it more affordable. The compartmentalized ultrafiltration cup divides the inner chamber into upper and lower chambers, which not only allows for sampling of the solution from both chambers, but also generates cross-flow velocities within the chambers. This effectively prevents the deposition of contaminants, continuously eliminates the filter cake layer and concentration polarization on the membrane surface, better stabilizes the membrane permeate flux, improves membrane treatment efficiency, and the rationally designed position of the stirring rod extends the membrane's service life. The internal membrane module can also be flexibly disassembled, facilitating membrane replacement without compromising airtightness. Summary of the Invention

[0004] To address the aforementioned technical problems of commercially available ultrafiltration cups, such as inconvenient membrane replacement, difficulty in obtaining materials, insufficient sealing, membrane clogging, and unstable permeate flow, this invention provides a laboratory ultrafiltration cup. The laboratory ultrafiltration cup is primarily manufactured using transparent acrylic sheets, stainless steel, and rubber materials. The reactor mainly consists of two parts: a detachable outer shell and a detachable membrane module. The detachable outer shell is machined by drilling holes in the thick surface and then connecting the parts with stainless steel screws and securing them with stainless steel nuts. The motor is connected to the top of the shell, and the stirring rod is fixed to the top and connected to the motor. The membrane module mainly consists of a bottom support component, a membrane support component, two-chamber sealing rings, a membrane support screen plate, a membrane pressing sealing ring, and a membrane pressing component. The stainless steel bottom support component supports the membrane support component. The two-chamber sealing rings are embedded in the outer groove of the membrane support component for sealing and are in close contact with the feed liquid shell, dividing the internal space into two chambers to achieve the function of a separable membrane module. The filter membrane is placed on the stainless steel membrane support screen plate and compacted by the membrane pressing sealing ring embedded in the inner groove of the membrane pressing component. The two components are connected by stainless steel screws fixed to the bottom support component and secured with membrane pressing nuts. Finally, the two components are sealed by the screen plate sealing ring embedded in the inner groove of the membrane support component, forming a closed space, which creates good conditions for cross-flow filtration.

[0005] The technical means employed in this invention are as follows:

[0006] A laboratory ultrafiltration cup includes: a detachable outer shell and a detachable membrane assembly, wherein the outer shell is made of acrylic sheet and the membrane assembly is made of stainless steel and transparent acrylic.

[0007] The outer casing includes a base plate and a feed liquid housing. One end of the feed liquid housing is closed, and the other end has an opening. The base plate is sealed to the open end of the feed liquid housing. The interior of the feed liquid housing and the base plate forms a closed hollow cavity. The membrane module is sealed and installed inside the feed liquid housing, dividing the hollow cavity into a permeate chamber and a feed liquid chamber. The feed liquid chamber is away from the base plate. A filter membrane is installed on the membrane module, and the filter membrane is located between the permeate chamber and the feed liquid chamber.

[0008] The feed liquid housing is provided with an overflow port, a cross-flow liquid outlet and a permeate outlet in sequence. The overflow port is connected to the feed liquid chamber and is used to feed the feed liquid into the feed liquid chamber. The cross-flow liquid outlet is connected to the feed liquid chamber and is used to discharge concentrated liquid. The permeate outlet is connected to the permeate chamber and is used to discharge permeate or clear liquid that has passed through the filter membrane.

[0009] Furthermore, the membrane assembly can be removed and replaced as a whole, including a bottom support component, a membrane support component, and a membrane pressing component. The bottom support component is close to the bottom plate and is provided with multiple stainless steel screw rods. The membrane support component and the membrane pressing component are provided with multiple coaxial through holes. The through holes are connected to the screw rods. The multiple screw rods pass through the membrane support component and the membrane pressing component in sequence, and the protruding ends are connected to the membrane pressing nuts. The membrane assembly is fastened by screwing the multiple membrane pressing nuts onto the multiple screw rods of the bottom support component.

[0010] The filter membrane is installed between the membrane support member and the membrane pressing member, and the membrane support member is sealed to the inner wall of the feed liquid housing.

[0011] Furthermore, a seal is formed between the membrane support member and the pressure membrane member;

[0012] A sieve groove is provided on the side of the membrane support member near the membrane pressing member. A stainless steel membrane support sieve plate is embedded in the sieve groove. The outer diameter of the sieve groove is equal to the outer diameter of the membrane support sieve plate.

[0013] The membrane pressing component has a groove on its side near the membrane support component. A membrane pressing sealing ring is embedded in the groove. The membrane pressing sealing ring presses against the filter membrane or thin film placed on the membrane support screen plate. The outer diameter of the membrane pressing sealing ring is equal to the outer diameter of the filter membrane, and the material is rubber.

[0014] Furthermore, the outer diameters of the membrane support component and the membrane pressing component are equal; an inner groove is provided on the side of the membrane support component near the membrane pressing component, and a stainless steel sieve sealing ring is embedded in the inner groove. The sieve sealing ring is in close contact with the membrane pressing component to perform a seal; the sieve sealing ring is made of rubber.

[0015] Furthermore, the outer surface of the membrane support member is provided with an outer groove, in which a two-chamber sealing ring is embedded. The two-chamber sealing ring is in close contact with the feed liquid housing to achieve a seal, and at the same time divides the space inside the feed liquid housing into a permeate chamber and a feed liquid chamber. The outer diameter of the two-chamber sealing ring is larger than the outer diameter of the membrane support member, and the material is rubber.

[0016] Furthermore, the bottom support component is made of stainless steel, and its outer diameter is smaller than the inner diameter of the feed liquid housing.

[0017] Furthermore, the inner side of the bottom plate has an inner groove, in which a bottom sealing ring is embedded. The bottom sealing ring is in close contact with the feed liquid housing to achieve a seal and prevent the permeated liquid from flowing out. The bottom sealing ring is made of rubber.

[0018] Furthermore, the base of the bottom plate and the open end of the feed liquid housing are provided with multiple coaxial and through holes. Stainless steel bottom support screw rods are connected in the through holes. The end of the bottom support screw rod that passes through the through hole is connected with a bottom support nut. The outer shell is fastened by screwing multiple bottom support nuts onto multiple stainless steel bottom support screw rods.

[0019] Furthermore, the feed liquid chamber is equipped with a stirring rod, which is fixed to the top surface of the feed liquid shell, is made of stainless steel, and is connected to the top external motor and speed controller.

[0020] Furthermore, the thickness of the plexiglass sheet used for the outer shell is 5mm.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The laboratory ultrafiltration cup provided by this invention is a small-scale membrane assembly for evaluating the filtration performance of ultrafiltration membranes in the laboratory. The acrylic reactor is clearly transparent, allowing for easy observation of experimental phenomena. The shell, base plate, and feed liquid shell are detachable, enabling cleaning of the reactor's internal space and flexible expansion of its effective volume. The base supports the membrane assembly at a certain height, and the two-chamber sealing rings divide the internal space into upper and lower chambers, allowing for separate sampling and testing of the liquid in each chamber. The shell and membrane assembly are sealed with rubber rings, providing a better seal than silicone plates and reducing the risk of concentrated water leakage to the clean water side. Membrane replacement is quick and easy, requiring only the unscrewing of the nut. This reactor is suitable for small-scale laboratory ultrafiltration condition studies and represents an excellent laboratory ultrafiltration cup reactor design.

[0023] In summary, the technical solution of this invention can solve the problems of inconvenient membrane replacement, difficulty in obtaining materials, insufficient sealing, membrane clogging, and unstable permeate flow of ultrafiltration cups on the market.

[0024] Based on the above reasons, this invention can be widely applied in fields such as filtration. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an isometric view of the disassembled shell and membrane module of the laboratory ultrafiltration cup reactor of this invention.

[0027] Figure 2These are three views of the exploded shell and membrane module of the laboratory ultrafiltration cup reactor of the present invention, wherein (a) is the front view, (b) is the side view, and (c) is the top view.

[0028] Figure 3 This is a schematic diagram of the outer shell after the present invention has been secured.

[0029] Figure 4 This is a schematic diagram of the membrane support component of the present invention, wherein (a) is an axonometric view, (b) is a front view, (c) is a side view, and (d) is a top view.

[0030] Figure 5 This is a schematic diagram of the pressure film component of the present invention, wherein (a) is an isometric view, (b) is a front view, (c) is a side view, and (d) is a top view.

[0031] Figure 6 This is a schematic diagram of the membrane module assembly process of the present invention, wherein (a) is an isometric view, (b) is a perspective view from a first perspective, (c) is a perspective view from a second perspective, and (d) is a perspective view from a third perspective.

[0032] Figure 7 This is a schematic diagram of the bottom support component of the present invention, wherein (a) is an isometric view, (b) is a front view, (c) is a side view, and (d) is a top view.

[0033] Figure 8 This is a schematic diagram of the membrane replacement process of the membrane module of the present invention, wherein (a) is an isometric view, (b) is a front view, (c) is a side view, and (d) is a top view.

[0034] In the diagram: 1. Bottom support screw rod; 2. Bottom support plate; 3. Bottom support sealing ring; 4. Bottom support component; 5. Membrane support component; 6. Two-chamber sealing ring; 7. Membrane support sieve plate; 8. Membrane pressing sealing ring; 9. Membrane pressing component; 10. Membrane pressing nut; 11. Stirring rod; 12. Bottom support nut; 13. Permeate outlet; 14. Cross-flow liquid outlet; 15. Overflow port; 16. Feed liquid shell; 17. Sieve plate sealing ring. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0039] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0040] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0041] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0042] This invention provides a laboratory ultrafiltration cup, belonging to the field of membrane biology and membrane chemical reactor water treatment technology. It is a small-scale reactor that can be used in the laboratory to evaluate the filtration performance of ultrafiltration membranes. The laboratory ultrafiltration cup reactor is manufactured using materials such as transparent plexiglass, stainless steel, and rubber. The reactor mainly consists of two parts: a detachable outer shell and a detachable membrane module. The detachable outer shell is machined by drilling holes in the thick surface and then connecting the parts with stainless steel screws and securing them with stainless steel nuts. The motor is connected to the top of the shell, and the stirring rod is fixed to the top and connected to the motor. The membrane module mainly consists of a bottom support component, a membrane support component, two-chamber sealing rings, a membrane support screen plate, a membrane pressing sealing ring, and a membrane pressing component. The bottom support component supports the membrane support component. The two-chamber sealing rings are embedded in the outer groove of the membrane support component for sealing and are in close contact with the feed liquid shell, dividing the internal space into two chambers to achieve the function of a separable membrane module. The filter membrane is placed on the membrane support screen plate and compacted by the membrane pressing sealing ring embedded in the inner groove of the membrane pressing component. Stainless steel screws connected the two components to the bottom support component and are secured with membrane pressing nuts. Finally, the screen plate sealing ring embedded in the inner groove of the membrane support component seals the two components, forming a closed space, which creates good conditions for cross-flow filtration.

[0043] like Figure 1-8 As shown, the laboratory ultrafiltration cup comprises an ultrafiltration cup consisting of a housing and a membrane assembly. Figure 1The shell consists of a bottom support screw rod 1, a bottom support plate 2, a bottom support sealing ring 3, a stirring rod 11, a bottom support nut 12, a permeate outlet 13, a cross-flow outlet 14, an overflow port 15, a feed liquid shell 16, and a sieve plate sealing ring 17. The membrane assembly consists of a bottom support component 4, a membrane support component 5, a two-chamber sealing ring 6, a membrane support sieve plate 7, a membrane pressure sealing ring 8, a membrane pressure component 9, and a membrane pressure nut 10.

[0044] The reactor is constructed from plexiglass, stainless steel, and rubber. The shell is secured by bottom nuts 12 screwed onto four stainless steel bottom screws 1. A bottom sealing ring 3 seals the feed liquid shell 16 to the bottom plate 2. The stirring rod 11 is fixed to the top surface of the feed liquid shell 16. The membrane module is secured by pressing nuts 10 screwed onto the four screws of the bottom component 4. A screen sealing ring 17 seals the membrane support component 5 to the pressing component 9. The filter membrane is fixed to the membrane support screen plate 7 by the pressing component 9. The plexiglass membrane module can be removed for membrane replacement, and the membrane module can be disassembled from the bottom during membrane replacement.

[0045] The ultrafiltration cup is secured by a bottom support screw 1 and a bottom support nut 12. The entire shell is made of 5mm thick acrylic sheet. The bottom support plate 2 is manufactured in the same way as the base of the feed liquid shell 16, with four equally spaced holes drilled for the bottom support screw 1 to pass through. The bottom sealing ring 3 is embedded in the inner groove of the bottom support plate 2 to provide a seal and prevent permeate from flowing out. The internal membrane module is made of stainless steel, while the other part is made of transparent acrylic. This design not only allows for good observation of the internal filtration process but also greatly improves the oxidation and corrosion resistance of the internal components, while also providing good airtightness. The bottom support component 4 is made of stainless steel, and its outer diameter is smaller than the inner diameter of the feed liquid shell 16. It supports the membrane module and allows for easy removal of the membrane module for membrane replacement. The specific manufacturing process is as follows. Figure 7 As shown. Four holes are drilled at equal intervals in the membrane support component 5 for the bolts of the bottom support component 4 to pass through. The outer diameter of the two-chamber sealing ring 6 is larger than the outer diameter of the membrane support component 5, and it is embedded in the outer groove of the membrane support component 5, making close contact with the feed liquid housing 16 to achieve a good sealing effect. Its specific processing method is as follows... Figure 4 As shown, the internal space of the feed liquid housing 16 can be divided into upper and lower chambers (dividing the internal space into a permeate chamber and a feed liquid chamber to prevent leakage), allowing sampling in both chambers for convenient subsequent experiments. The sieve plate sealing ring 17 is embedded in the inner groove of the membrane support component 5 and is in close contact with the membrane pressing component 9, achieving a sealing effect and providing good conditions for cross-flow filtration. The specific processing method is as follows. Figure 5The filter membrane is placed on the stainless steel membrane support screen plate 7 and embedded in the screen plate groove of the membrane support component 5. The screen plate groove has the same outer diameter as the membrane support screen plate 7, providing good fixation. The membrane sealing ring 8 is embedded in the groove of the membrane pressure component 9, providing membrane fixation. The outer diameter of the membrane sealing ring 8 is equal to the outer diameter of the circular filter membrane, used to fasten and fix the filter membrane with the membrane support component 5. The membrane pressure component 9 has four holes drilled at equal intervals for the screws of the bottom support component 4 to pass through. Its outer diameter is the same as that of the membrane support component 5. The stirring rod 11 is fixed to the top of the feed liquid housing 16. It is made of stainless steel and contains circuitry. It is connected to an external motor and speed controller to provide power to the stirring rod 11. The stirring rod 11 stirs the feed liquid, making the feed liquid evenly distributed and preventing sludge from clogging the filter membrane. The assembly method of the entire membrane module is as follows. Figure 6 As shown. The feed liquid enters through overflow port 15, and the concentrated liquid is stirred by stirring rod 11, which prevents sludge deposition. Under the action of cross-flow filtration, it flows out through cross-flow outlet 14. The filtered clear liquid passes through the membrane module and flows out through permeate outlet 13. The entire membrane module is detachable and has excellent sealing performance due to the action of rubber rings. When replacing the membrane, simply disassemble the membrane module, clean the residue inside the module and the residue on the screen plate, place the filter membrane on the membrane support screen plate, and splice and tighten the module. This allows for convenient membrane replacement without damaging the module. The specific membrane replacement process is as follows. Figure 8 .

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laboratory ultrafiltration cup, characterized in that, include: A detachable outer shell and a detachable membrane assembly, wherein the outer shell is made of acrylic sheet and the membrane assembly is made of stainless steel and transparent acrylic. The outer casing includes a base plate (2) and a feed liquid housing (16). One end of the feed liquid housing (16) is closed, and the other end has an opening. The base plate (2) is sealed to the opening end of the feed liquid housing (16). The interior of the feed liquid housing (16) and the base plate (2) forms a closed hollow cavity. The membrane assembly is sealed and installed inside the feed liquid housing (16), dividing the hollow cavity into a permeate chamber and a feed liquid chamber. The feed liquid chamber is away from the base plate (2). A filter membrane is installed on the membrane assembly, and the filter membrane is located between the permeate chamber and the feed liquid chamber. The feed liquid housing (16) is provided with an overflow port (15), a cross-flow liquid outlet (14), and a permeate outlet (13) in sequence. The overflow port (15) is connected to the feed liquid chamber and is used to feed the feed liquid into the feed liquid chamber. The cross-flow liquid outlet (14) is connected to the feed liquid chamber and is used to discharge concentrated liquid. The permeate outlet (13) is connected to the permeate chamber and is used to discharge permeate or clear liquid that has passed through the filter membrane. The membrane assembly can be removed and replaced as a whole, including a bottom support component (4), a membrane support component (5), and a membrane pressing component (9). The bottom support component (4) is close to the bottom plate (2). The bottom support component (4) is provided with multiple stainless steel screw rods. The membrane support component (5) and the membrane pressing component (9) are provided with multiple coaxial through holes. The through holes are connected to the screw rods. The multiple screw rods pass through the membrane support component (5) and the membrane pressing component (9) in sequence, and the protruding ends are connected to the membrane pressing nuts (10). The membrane assembly is fastened by screwing the multiple membrane pressing nuts (10) onto the multiple screw rods of the bottom support component (4). The filter membrane is installed between the membrane support member (5) and the membrane pressing member (9), and the membrane support member (5) and the membrane pressing member (9) are sealed together. The membrane support member (5) is also sealed to the inner wall of the feed liquid housing (16). The outer surface of the membrane support member (5) is provided with an outer groove, and a two-chamber sealing ring (6) is embedded in the outer groove. The two-chamber sealing ring (6) is in close contact with the feed liquid housing (16) to achieve a seal. At the same time, the space inside the feed liquid housing (16) is divided into a permeate chamber and a feed liquid chamber, and the solution can be sampled from the two chambers respectively. It can also generate cross-flow velocity in the chamber, thereby effectively preventing the deposition of pollutants, continuously eliminating the filter cake layer and concentration polarization on the membrane surface, and better stabilizing the membrane permeate flux and improving the membrane treatment efficiency. The outer diameter of the two-chamber sealing ring (6) is larger than the outer diameter of the membrane support member (5), and the material is rubber. The bottom support component (4) is made of stainless steel and its outer diameter is smaller than the inner diameter of the feed liquid housing (16); The base of the bottom plate (2) and the feed liquid housing (16) has multiple coaxial and through holes. Stainless steel bottom screw rods (1) are connected in the through holes. The end of the bottom screw rod (1) that passes through the through hole is connected to a stainless steel bottom nut (12). The housing is fastened by screwing multiple bottom nuts (12) onto multiple stainless steel bottom screw rods (1).

2. The laboratory ultrafiltration cup according to claim 1, characterized in that, A sieve groove is provided on the side of the membrane support member (5) near the membrane pressing member (9), and a stainless steel membrane support sieve plate (7) is embedded in the sieve groove. The outer diameter of the sieve groove is equal to the outer diameter of the membrane support sieve plate (7). The membrane pressing component (9) has a groove on its side near the membrane support component (5), and a membrane pressing sealing ring (8) is embedded in the groove. The membrane pressing sealing ring (8) is pressed on the filter membrane or thin film placed on the membrane support sieve plate (7). The outer diameter of the membrane pressing sealing ring (8) is equal to the outer diameter of the filter membrane, and the material is rubber.

3. The laboratory ultrafiltration cup according to claim 2, characterized in that, The outer diameters of the membrane support member (5) and the membrane pressing member (9) are equal; an inner groove is provided on the side of the membrane support member (5) near the membrane pressing member (9), and a stainless steel sieve sealing ring (17) is embedded in the inner groove. The sieve sealing ring (17) is in close contact with the membrane pressing member (9) to seal it; the material of the sieve sealing ring (17) is rubber.

4. The laboratory ultrafiltration cup according to claim 1, characterized in that, The inner side of the bottom plate (2) has an inner groove, in which a bottom sealing ring (3) is embedded. The bottom sealing ring (3) is in close contact with the feed liquid housing (16) to achieve a seal and prevent the permeate liquid from flowing out. The bottom sealing ring (3) is made of rubber.

5. The laboratory ultrafiltration cup according to claim 1, characterized in that, The feed liquid chamber is equipped with a stirring rod (11), which is fixed to the top surface of the feed liquid shell (16), is made of stainless steel, and is connected to the top external motor and speed controller.

6. The laboratory ultrafiltration cup according to claim 1, characterized in that, The outer shell is made of 5mm thick acrylic sheet.

Images