Centrifugal filtration type film forming device

Abstract

The invention discloses a centrifugal filtration type film forming device which comprises a barrel body, the barrel body comprises a first barrel wall, a second barrel wall and a third barrel wall, the second barrel wall is arranged around the first barrel wall, the third barrel wall is arranged around the second barrel wall, and gaps are formed among the first barrel wall, the second barrel wall and the third barrel wall. A spacing area between the first barrel wall and the second barrel wall is a stock solution area, a spacing area between the second barrel wall and the third barrel wall is a filtrate area, a plurality of filtering holes are formed in the second barrel wall, the stock solution area and the filtrate area are communicated through the filtering holes, a filtering membrane and a filtering plate are installed at the filtering holes, one side of the filtering membrane is the stock solution area, and the other side of the filtering membrane is the filtering plate. A barrel cover matched with the barrel body in size covers the barrel body, and the barrel body is connected with a power driving piece. Efficient filtration is achieved through centrifugal force, the industrial rapid treatment requirement is met, accurate filtration is achieved by replacing the filter membrane, and the problem of membrane forming quality control is solved.

Description

Technical Field

[0001] The invention relates to material separation and film-forming technology, and in particular to a centrifugal filtration film-forming device. Background Art

[0002] In the current field of material preparation and liquid separation, efficient and accurate filtration membrane technology is crucial. Traditional filtration methods, such as gravity filtration, rely on the gravity of the liquid itself to achieve solid-liquid separation through the filter material. Its efficiency is extremely low. For a large amount of liquid to be treated, the treatment cycle is long and it is difficult to meet the needs of industrial production. Although pressure filtration has increased the filtration speed to a certain extent and forced the liquid to pass through the filter membrane by applying external force, it has limited interception effect on some tiny particles, and it is easy to cause local damage to the filter membrane due to uneven pressure, affecting the filtration quality and service life of the filter membrane. In terms of membrane formation, existing membrane forming technologies, such as solution casting, are difficult to accurately control the thickness and pore size uniformity of the membrane, and there are great challenges in preparing micro-nano-scale films with specific performance requirements. In addition, these traditional methods are often unable to effectively separate and prepare high-quality films when faced with micro-nano material suspensions with complex components, resulting in uneven product quality and limiting the further development of related fields.

[0003] In the field of centrifugal filtration technology, existing centrifugal filtration devices have many deficiencies in structural design. For example, a control structure for centrifugal filtration collection of micron and submicron particles (application number 201610797678.6) mainly separates large particles from small particles, but cannot separate solids and liquids. After the centrifugal process is completed, the liquid may reflux due to lack of centrifugal force. In the absence of a top cover, the liquid may fly out of the device under high-speed centrifugation.

[0004] In summary, there is an urgent practical need to develop a centrifugal filtration membrane-forming device that can efficiently and accurately achieve filtration membrane formation of micro-nano material suspensions, and has a stable structure and convenient operation. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a centrifugal filtration type membrane forming device.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A centrifugal filtration membrane forming device comprises a barrel body, wherein the barrel body comprises a first barrel wall, a second barrel wall and a third barrel wall, wherein the second barrel wall is arranged around the first barrel wall, and the third barrel wall is arranged around the second barrel wall, and there are intervals between the first barrel wall, the second barrel wall and the third barrel wall, wherein the interval area between the first barrel wall and the second barrel wall is a raw liquid area, and the interval area between the second barrel wall and the third barrel wall is a filtrate area;

[0008] A plurality of filter holes are provided on the wall of the second barrel, the raw liquid area and the filtrate area are connected through the filter holes, a filter membrane and a filter plate are installed at the filter holes, one side of the filter membrane is the raw liquid area, and the other side is the filter plate;

[0009] The upper cover of the barrel body is provided with a barrel cover matching its size;

[0010] The barrel body is connected to a power driving member.

[0011] Furthermore, the filter membrane is detachably connected to the filter plate.

[0012] Furthermore, the second barrel wall has a slope design where the filter plate is installed.

[0013] Furthermore, a sealing ring is provided at the connection between the barrel cover and the barrel body.

[0014] Furthermore, the power driving member is a motor, and the output shaft of the motor is rotationally connected to the barrel body.

[0015] Furthermore, the barrel body, the barrel cover and the power driving member are connected by a fixing element.

[0016] Furthermore, the pore size of the filter plate is larger than the pore size of the filter membrane.

[0017] Furthermore, the filter plate is a sand core filter plate made of materials such as high borosilicate glass and quartz sand.

[0018] Furthermore, the cross-sectional area of ​​the raw liquid region is smaller than the cross-sectional area of ​​the filtrate region.

[0019] Furthermore, the filter holes are opened sequentially along the circumference of the second barrel wall.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] 1. The design of replaceable filter membrane enables the device to select filter membranes with appropriate pore sizes according to different filtering requirements, and realize accurate filtration of impurities of different particle sizes in micro-nano material suspensions. The solid-liquid separation effect is good, and there will be no backflow problem. Micro-nano materials, especially two-dimensional materials, can be pressed into thin films under the action of centrifugal force, which can be applied in the fields of flexible electronic devices, etc. At the same time, it solves the problem of difficult control of film thickness and pore size uniformity in existing film-forming technologies;

[0022] 2. The connection between the barrel and the motor through the fixing element ensures the stability of the device during high-speed rotation, avoiding the safety hazards and poor filtering effect caused by shaking. The inclined surface design of the barrel near the sand core filter plate not only helps a small amount of liquid flow to the filter membrane, improves the utilization rate of the liquid, reduces residue and waste, but also facilitates the removal and installation positioning of the replaceable filter membrane, improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Attached Figure 1 This is a schematic diagram of the cross-sectional structure of an embodiment of the present application through the axis;

[0025] Attached Figure 2 This is a schematic diagram of the cross-sectional structure along the AA plane of the embodiment of the present application;

[0026] Attached Figure 3 for Figure 1 A magnified view of point B;

[0027] Attached Figure 4 This is a schematic diagram of the working principle of an embodiment of the present application;

[0028] Attached Figure 5 This is a schematic diagram after the centrifugation of the embodiment of the present application is completed.

[0029] Reference numerals and component descriptions in the drawings:

[0030] 1. Barrel body; 11. First barrel wall; 12. Second barrel wall; 13. Third barrel wall; 2. Raw liquid area; 3. Filtrate area; 4. Filter hole; 5. Filter membrane; 6. Filter plate; 7. Barrel cover; 8. Power drive component; 9. Fixed element. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below through specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See attached Figures 1 to 5As shown, a centrifugal filtration membrane-forming device proposed in the present application includes a barrel body 1, and the barrel body 1 includes a first barrel wall 11, a second barrel wall 12 and a third barrel wall 13. The second barrel wall 12 is arranged around the first barrel wall 11, and the third barrel wall 13 is arranged around the second barrel wall 12. There are intervals between the first barrel wall 11, the second barrel wall 12 and the third barrel wall 13. The interval area between the first barrel wall 11 and the second barrel wall 12 is a raw liquid area 2, and the interval area between the second barrel wall 12 and the third barrel wall 13 is a filtrate area 3. A plurality of filter holes 4 are opened on the second barrel wall 12, and the raw liquid area 2 and the filtrate area 3 are connected through the filter holes 4. A filter membrane 5 and a filter plate 6 are installed at the filter hole 4, one side of the filter membrane 5 is the raw liquid area 2, and the other side is the filter plate 6. The barrel body 1 is covered with a barrel cover 7 whose size matches the barrel body 1, and the barrel body 1 is connected to a power drive member 8.

[0033] The above structure is further described below:

[0034] See attached Figures 1 to 5 As shown, the first barrel wall 11, the second barrel wall 12 and the third barrel wall 13 divide the barrel body 1 into a raw liquid area 2 and a filtrate area 3 which are not connected at the bottom. A plurality of filter holes 4 are opened on the second barrel wall 12, and a filter membrane 5 and a filter plate 6 are installed at the filter holes 4. One side of the filter membrane 5 is the raw liquid area 2, and the other side is the filter plate 6, so as to achieve liquid passage. Among them, the filter membrane 5 is a replaceable filter membrane. The design of the replaceable filter membrane enables the device to select a filter membrane with a suitable pore size according to different filtering requirements, so as to achieve accurate filtration of impurities of different particle sizes in the micro-nano material suspension, thereby preparing a high-quality film, solving the problem that the uniformity of the film thickness and pore size is difficult to control in the existing film forming technology. At the same time, the solid cut-off size in the liquid to be filtered is mainly affected by the replaceable filter membrane. By adjusting the pore size of the replaceable filter membrane, the size of the obtained solid and the particles remaining in the filtrate can be controlled. The filter plate 6 is a sand core filter plate, which mainly serves to fix the filter membrane. The material of the sand core filter plate can be selected from high borosilicate glass, quartz sand and other materials. The pore size range can be adjusted according to the selected sand core filter plate material and manufacturing process. The pore size of the sand core filter plate should be larger than the pore size of the replaceable filter membrane. Generally, the pore size of the sand core filter plate should be more than ten times larger than the pore size of the replaceable filter membrane.

[0035] See attached Figures 1 to 5 As shown, the diameters of the stock liquid area 2 and the filtrate area 3 can be adjusted, and the cross-sectional area of ​​the stock liquid area 2 is smaller than the cross-sectional area of ​​the filtrate area 3 to prevent the filtrate from flowing back to the stock liquid area 2 after the centrifugal force is withdrawn. Under the action of the centrifugal force, the suspension in the stock liquid area 2 quickly adheres to the second barrel wall 12, and enters the filtrate area 3 through the replaceable filter membrane, the sand core filter plate and the filter hole 4 in turn. Solids larger than the pore size of the filter membrane 5 gradually accumulate on the surface of the filter membrane to form a thin film. As the filtration proceeds, it can be observed that the liquid level in the stock liquid area 2 gradually decreases, and the liquid level in the filtrate area 3 gradually increases.

[0036] See attached Figure 2As shown, by opening a plurality of filter holes 4 on the second barrel wall 12, six filter holes 4 are opened on the second barrel wall 12 in this embodiment, that is, the six filter holes 4 divide the second barrel wall 12 into six pieces along the circumferential direction, and the second barrel wall 12 has a slope design near the sand core filter plate, which not only helps a small amount of liquid to flow to the filter membrane, improves the utilization rate of the liquid, reduces residue and waste, but also facilitates the disassembly and installation positioning of the replaceable filter membrane, and improves the convenience of operation. If the filter membrane 5 needs to be replaced for the next filtering operation, the slope design is used to clamp a corner of the filter membrane 5 with tweezers and gently pull it upward. Due to the guiding effect of the slope, the filter membrane 5 can be easily removed from the sand core filter plate. The new filter membrane 5 is replaced according to the steps of preparing and installing the filter membrane, and then the various steps of the above-mentioned filtering membrane forming operation are repeated to carry out a new round of filtering membrane forming work. When the filter membrane is replaced each time, the sand core filter plate should be checked. If there is damage or impurities remaining, it needs to be cleaned or replaced to ensure the stability of the filtering effect. At the same time, the sand core filter plate should have good rotational symmetry, that is, symmetry about the axis center, to reduce the size of the centrifugal force during high-speed centrifugation. After the device is assembled, a strict rotation balance test is required. For the barrel body 1 and barrel cover 7 with excessive axial centrifugal force during rotation, targeted adjustment and trimming are required to ensure uniform mass distribution of each component and reduce vibration and noise during operation.

[0037] See attached Figure 1 As shown, the barrel body 1 is covered with a barrel cover 7, which fits tightly with the barrel body 1. A thin layer of sealant is evenly applied on the contact part between the barrel body 1 and the barrel cover 2, or a sealing ring is installed. Slowly lower the barrel cover, align it with the interface of the barrel body 1, gently rotate and press down until the barrel cover 7 fits perfectly with the barrel body 1. Use your hand to check along the connection between the barrel cover 7 and the barrel body 1 to ensure that the seal is good and there is no gap. Good sealing can prevent the liquid from overflowing from the interface between the barrel body 1 and the barrel cover 7 under the action of centrifugal force, ensure the closedness of the filtration environment, and prevent external impurities from entering and affecting the filtration effect.

[0038] See attached Figure 1 As shown, the barrel body 1 is connected to the power drive 8, that is, the motor. The barrel body 1 is connected to the output shaft of the motor through a key or spline to ensure synchronous operation, and to provide core power support for liquid filtration by generating a strong centrifugal force. When in use, the connecting shaft end of the barrel body 1 is docked with the output shaft of the motor so that the key or spline can be accurately embedded in the corresponding groove. Use tools such as wrenches to tighten the fastening bolts of the connecting parts to ensure that the barrel body 1 is tightly connected to the motor shaft and can operate synchronously and stably under high-speed rotation. After the connection is completed, manually turn the motor shaft to check whether the barrel body can rotate smoothly and whether there is any jamming. As a power source for providing centrifugal force, the motor is crucial to be stably connected to the barrel body 1. Only when the two operate synchronously can sufficient and stable centrifugal force be generated in subsequent work to drive liquid filtration.

[0039] See attached Figure 1 As shown, in this embodiment, a fixing element 9, such as a special clamp or a fixing bracket, is used to fix the barrel body 1, the barrel cover 7 and the output shaft of the motor. When fixing, it is necessary to ensure that the center of gravity of the device is stable to avoid shaking or deviation during subsequent operation. After the fixing is completed, check the connection of each component again to ensure that it is firm and reliable. A stable device structure is a prerequisite for achieving a stable centrifugal field. Only when the device is stable as a whole can it be ensured that the centrifugal force acts evenly on the liquid during high-speed rotation to achieve the expected filtering and film-forming effects.

[0040] The centrifugal acceleration of this application can be used It is obtained that ω is the angular velocity (rotation speed) of the motor, and d is the diameter of the cylindrical shape surrounded by the filter membrane 5. The centrifugal acceleration can be adjusted by adjusting the angular velocity ω and the diameter d to control the film quality. Taking d = 60mm, ω = 5000rpm as an example, the centrifugal acceleration is 8.2×10 3 m / s 2 , about 840 times the acceleration due to gravity.

[0041] When the present application is working, a replaceable filter membrane is infiltrated with a small amount of deionized water and then attached to the surface of the sand core filter plate, the micro-nano material suspension is poured into the stock liquid area 2, and the barrel cover 7 is covered. The barrel body 1, the barrel cover 7 and the output shaft of the motor are fixed by the fixing element 9. The motor speed is gradually increased, such as Figure 4 As shown, when the rotation speed is large enough, the centrifugal acceleration is much larger than the gravitational acceleration, and the effect of gravity can be ignored. The whole can be approximately considered to be affected only by the centrifugal field. The suspension in the stock liquid area 2 will stick to the second barrel wall 12. Under the action of centrifugal force, it will successively pass through the replaceable filter membrane, the sand core filter plate and the filter hole 4 to reach the filtrate area 3. The liquid in the filtrate area 3 will also stick to the third barrel wall 13 under the action of centrifugal force, which can avoid the filtrate from flowing back. After the work is completed, the suspension in the stock liquid area 2 will all be filtered to reach the filtrate area 3. The solid matter with a size exceeding the pore size of the filter membrane will be blocked on the surface of the filter membrane to form a thin film. Then the rotation of the motor will be gradually stopped. At this time, the direction of the combined force of gravity and centrifugal force will gradually transition from radially outward to vertically downward. Finally, when it is only affected by gravity, as shown in Figure 5 The filtrate will remain in the filtrate zone 3 and will not flow back to the raw liquid zone 2.

[0042] The present application uses a centrifugal method to make the liquid to be filtered always subject to the same centrifugal acceleration, and will not be affected by solid particles blocking the filter membrane pores. The present application can play two roles. First, it is used for the separation of micro-nano materials and liquids, with good solid-liquid separation effect and no reflux problem; second, micro-nano materials, especially two-dimensional materials, can be pressed into thin films under the action of centrifugal force, and applied in the fields of flexible electronic devices and the like.

[0043] The present application can be adapted to most centrifuges on the market, and the motor in the present application can be directly replaced by a centrifuge, which can greatly expand the application occasions of the present invention and reduce the manufacturing cost.

[0044] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A centrifugal filtration film forming device, characterized in that: The barrel body comprises a first barrel wall, a second barrel wall and a third barrel wall, wherein the second barrel wall is arranged around the first barrel wall, the third barrel wall is arranged around the second barrel wall, and there are intervals between the first barrel wall, the second barrel wall and the third barrel wall, the interval area between the first barrel wall and the second barrel wall is a raw liquid area, and the interval area between the second barrel wall and the third barrel wall is a filtrate area; A plurality of filter holes are provided on the wall of the second barrel, the raw liquid area and the filtrate area are connected through the filter holes, a filter membrane and a filter plate are installed at the filter holes, one side of the filter membrane is the raw liquid area, and the other side is the filter plate; The upper cover of the barrel body is provided with a barrel cover matching its size; The barrel body is connected to a power driving member.

2. A centrifugal filtration membrane forming device according to claim 1, characterized in that: The filter membrane is detachably connected to the filter plate.

3. A centrifugal filtration membrane forming device according to claim 1, characterized in that: The second barrel wall has a slope design where the filter plate is installed.

4. The centrifugal filtration membrane forming device according to claim 1, characterized in that: A sealing ring is provided at the connection between the barrel cover and the barrel body.

5. The centrifugal filtration membrane forming device according to claim 1, characterized in that: The power driving member is a motor, and the output shaft of the motor is rotatably connected to the barrel body.

6. The centrifugal filtration membrane forming device according to claim 1, characterized in that: The barrel body, the barrel cover and the power driving member are connected via a fixing element.

7. The centrifugal filtration membrane forming device according to claim 1, characterized in that: The pore size of the filter plate is larger than the pore size of the filter membrane.

8. The centrifugal filtration membrane forming device according to claim 1, characterized in that: The filter plate is a sand core filter plate made of materials such as high borosilicate glass and quartz sand.

9. The centrifugal filtration membrane forming device according to claim 1, characterized in that: The cross-sectional area of ​​the raw liquid region is smaller than the cross-sectional area of ​​the filtrate region.

10. The centrifugal filtration membrane forming device according to claim 1, characterized in that: The filter holes are sequentially opened along the circumference of the second barrel wall.

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