Adjustable differential pressure type membrane filtration system

Abstract

The utility model provides an adjustable differential pressure type membrane filtration system. The adjustable differential pressure type membrane filtration system comprises a first filtration device, a second filtration device and a third filtration device which are sequentially connected from left to right, each of the first filtering device, the second filtering device and the third filtering device comprises an inner cylinder arranged in the outer cylinder; the communicating mechanism is arranged at the bottom end of the outer barrel; the pressurizing mechanism is arranged in the inner barrel and longitudinally moves along the inner part of the inner barrel; the membrane filtration mechanism is arranged at the lower part of the inner barrel; the feeding hole is formed in the upper end of the outer part of the inner barrel; the first valve body is arranged on the feeding hole; when the pressurizing mechanism moves to the first position, the pressurizing mechanism is higher than the feeding port, and when the pressurizing mechanism moves to the second position, the pressurizing mechanism is lower than the feeding port; the first filtering device, the second filtering device and the third filtering device are connected through the communicating mechanism. According to the technical scheme, the nanofiltration effect and the production efficiency of the nanofiltration equipment can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of milk powder preparation equipment, and is an adjustable differential pressure membrane filtration system. Background Art

[0002] Due to its selective filtration characteristics, nanofiltration technology plays an important role in the dairy industry. Nanofiltration equipment mainly achieves the filtration effect through a nanofiltration membrane, and the working principle of the nanofiltration membrane is mainly based on the liquid-liquid separation process driven by a pressure difference. It allows small molecule substances such as water and specific monovalent ions to pass through, while retaining macromolecule substances and multivalent ions. Therefore, in the production process of dairy products, nanofiltration membrane technology is usually applied to the filtration and purification of milk, as well as the concentration and purification of dairy products. However, the current nanofiltration equipment is prone to clogging the nanofiltration membrane after multiple nanofiltrations, affecting the nanofiltration effect and reducing production efficiency.

[0003] In order to improve the nanofiltration effect and production efficiency of nanofiltration equipment, it is necessary to further improve it and increase the practicability of the nanofiltration equipment. Content of the Utility Model

[0004] The purpose of the present utility model is to provide an adjustable differential pressure membrane filtration system, which can effectively improve the nanofiltration effect and production efficiency of nanofiltration equipment.

[0005] The present application is achieved through the following technical solutions, specifically as follows:

[0006] An adjustable differential pressure membrane filtration system, comprising: a first filtration device, a second filtration device, and a third filtration device connected in sequence from left to right; the first filtration device, the second filtration device, and the third filtration device each include: an inner cylinder disposed inside an outer cylinder; a communication mechanism disposed at the bottom end of the outer cylinder; a pressurization mechanism disposed inside the inner cylinder and longitudinally moving along the inside of the inner cylinder; a membrane filtration mechanism disposed at the lower part of the inner cylinder; a feed port disposed at the upper end outside the inner cylinder, and a first valve body disposed on the feed port; wherein, when the pressurization mechanism moves to the first position, it is higher than the height of the feed port, and when the pressurization mechanism moves to the second position, it is lower than the height of the feed port; the first filtration device, the second filtration device, and the third filtration device are connected through the communication mechanism.

[0007] In the present application, by providing three sequentially connected filtering devices, continuous multi-stage filtering conditions are provided for the concentration of dairy products, which helps to gradually improve the filtering efficiency and quality. The pressurizing mechanism can move longitudinally inside the inner cylinder, and by changing its position, the pressure difference inside and outside the nanofiltration membrane during the filtering process can be adjusted, allowing the filtering system to adjust the pressure according to the filtering requirements and optimize the filtering effect. The pressurizing mechanism has two adjustable positions. Compared with the prior art where the feed inlet is connected to the pressurizing mechanism and the cylinder through a pipeline, in the present application, feeding is achieved by adjusting the relative position between the pressurizing mechanism and the feed inlet, simplifying the structure of the filtering system.

[0008] Further, the pressurizing mechanism includes: a driving component and a pressing plate fixedly connected along the output rod of the driving component; the pressing plate matches the shape of the inner cylinder.

[0009] Further, the driving component includes at least one of a driving hydraulic cylinder, an electric cylinder, and a servo motor.

[0010] As an improvement of the membrane filtering mechanism in the present application, the lower side wall of the inner cylinder is provided with a porous structure; the membrane filtering mechanism includes a metal mesh cylinder wrapped with a nanofiltration membrane and a fixing member provided on the outer wall of the top of the metal mesh cylinder, and the fixing member is hermetically fitted with the side wall of the inner cylinder through a gasket.

[0011] In the present application, the lower side wall of the inner cylinder being provided with a porous structure helps to more evenly distribute the pressure on the filtering medium and avoid uneven wear or rupture of the membrane. And the metal mesh cylinder provides good support for the nanofiltration membrane, further extending the service life of the membrane. The metal mesh cylinder and the lower side wall of the inner cylinder are hermetically fitted without gaps through the design of the fixing member and the gasket, ensuring that dairy products can only enter the cavity between the inner cylinder and the outer cylinder through the nanofiltration membrane, improving the nanofiltration effect on dairy products.

[0012] Further, in order to reduce the filtering resistance and improve the purity of dairy products, the membrane filtering mechanisms of the first filtering device, the second filtering device, and the third filtering device are respectively provided with nanofiltration membranes having different retention molecular weights.

[0013] As an improvement of the connection mechanism in the present application, the connection mechanism includes: a first discharge port connecting the cavity between the inner cylinder and the outer cylinder, and a second discharge port connecting the inner cylinder; the second discharge port of the first filtering device is connected to the feed inlet of the second filtering device through a pipeline; the second discharge port of the second filtering device is connected to the feed inlet of the third filtering device through a pipeline.

[0014] As an improvement of the adjustable differential pressure membrane filtration system in the present application, the first filtration device, the second filtration device, and the third filtration device further include: a pressure collector connected to the membrane filtration mechanism and a pressure sensor connected to the pressurization mechanism, and the pressure collector includes a pre-membrane pressure gauge and a post-membrane pressure gauge.

[0015] Further, the adjustable differential pressure membrane filtration system further includes: a controller connected to each of the pressure collectors and each of the pressure sensors of the first filtration device, the second filtration device, and the third filtration device, and a host computer electrically connected to the controller.

[0016] The beneficial effects of the present application are as follows:

[0017] 1. By providing three sequentially connected filtration devices in the present application, continuous multi-stage filtration conditions are provided for the concentration of dairy products, which helps to gradually improve the filtration efficiency and filtration quality. The pressurization mechanism can move longitudinally inside the inner cylinder, and the differential pressure inside and outside the nanofiltration membrane during the filtration process can be adjusted by changing its position, allowing the filtration system to adjust the pressure according to the filtration requirements and optimize the filtration effect. The pressurization mechanism has two adjustable positions. Compared with the prior art in which the feed inlet is connected to the pressurization mechanism and the cylinder through a pipeline, the present application realizes feeding by adjusting the relative position of the pressurization mechanism and the feed inlet, simplifying the structure of the filtration system.

[0018] 2. By setting the lower side wall of the inner cylinder as a porous structure in the present application, it helps to more evenly distribute the pressure on the filtration medium and avoid uneven wear or rupture of the membrane. And the setting of the metal mesh cylinder provides good support for the nanofiltration membrane, further extending the service life of the membrane. The metal mesh cylinder and the lower side wall of the inner cylinder are hermetically and seamlessly fitted through the design of fixing parts and gaskets, ensuring that the permeate containing impurities, lactose, minerals, and part of the protein can only enter the cavity between the inner cylinder and the outer cylinder through the nanofiltration membrane, improving the nanofiltration effect on dairy products.

[0019] In summary, the technical solution of the present application can effectively improve the nanofiltration effect and production efficiency of the adjustable differential pressure membrane filtration system. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of an adjustable differential pressure membrane filtration system provided by the present utility model;

[0021] Figure 2 It is a schematic cross-sectional structural diagram of the first filtration device provided by the present utility model;

[0022] Figure 3 It is a schematic connection diagram of the controller provided by the present utility model.

[0023] Description of the Reference Numerals:

[0024] 1. First filtering device; 2. Second filtering device; 3. Third filtering device; 10. Outer cylinder; 11. Inner cylinder; 12. Connecting mechanism; 13. Pressurizing mechanism; 14. Membrane filtering mechanism; 15. Feed inlet; 16. First valve body; 21. Driving component; 22. Output rod; 23. Pressing plate; 31. Metal mesh cylinder; 41. First discharge port; 42. Second discharge port; 171. Pressure gauge before membrane; 172. Pressure gauge after membrane; 17. Pressure collector; 4. Controller; 5. Host computer.

[0025] In addition to the technical problems solved by the present invention, the technical features constituting the technical solution, and the advantages brought by these technical features of the technical solution described above, other technical problems that the present invention can solve, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0027] In view of the problems existing in the prior art in the background art, the embodiments of the present application provide an adjustable differential pressure membrane filtration system, as Figure 1 shows a schematic structural diagram of an adjustable differential pressure membrane filtration system in an embodiment of the present application, Figure 2 shows a schematic sectional structure diagram of a first filtering device in an embodiment of the present application.

[0028] Refer to Figures 1-2 , the adjustable differential pressure membrane filtration system includes: a first filtering device 1, a second filtering device 2, and a third filtering device 3 connected in sequence from left to right; the first filtering device 1, the second filtering device 2, and the third filtering device 3 all include: an inner cylinder 11 disposed inside the outer cylinder 10; a connecting mechanism 12 disposed at the bottom end of the outer cylinder 10; a pressurizing mechanism 13 disposed inside the inner cylinder 11 and longitudinally moving along the inside of the inner cylinder 11; a membrane filtering mechanism 14 disposed at the lower part of the inner cylinder 11; a feed inlet 15 disposed outside the upper end of the inner cylinder 11 and a first valve body 16 disposed on the feed inlet 15; wherein, when the pressurizing mechanism 13 moves to the first position, it is higher than the height of the feed inlet 15, and when the pressurizing mechanism 13 moves to the second position, it is lower than the height of the feed inlet 15.

[0029] Specifically, the above-mentioned first filtering device 1, second filtering device 2 and third filtering device 3 have the same structure. The connecting mechanism 12 provided at the bottom end of the outer cylinder 10 is used for connecting the first filtering device 1, the second filtering device 2 and the third filtering device 3. The membrane filtering mechanism 14 is used to realize the filtration and separation of dairy products. The pressurizing mechanism 13 can move longitudinally inside the inner cylinder 11 as needed to adjust the filtration pressure. In the case of a feeding requirement, the pressurizing mechanism 13 moves to the first position higher than the height of the feeding port 15, and opens the first valve body 16 so that the dairy product enters the inner cylinder 11 through the feeding port 15. In the case of a filtering requirement, the first valve body 16 is closed to end the feeding, and the pressurizing mechanism 13 is moved to the second position lower than the feeding port 15 to increase the pressure.

[0030] Compared with the prior art in which the feeding port is connected to the communication hole opened in the pressurizing mechanism through a pipeline and the feeding is carried out into the inner cylinder, in this application, the feeding is realized by adjusting the relative position of the pressurizing mechanism and the feeding port, which simplifies the structure of the filtration system and improves the feeding efficiency.

[0031] In this application, by setting three successively connected filtering devices, continuous multi-stage filtering conditions are provided for the concentration of dairy products, which helps to gradually improve the filtering efficiency and filtering quality. The pressurizing mechanism can move longitudinally inside the inner cylinder, and by changing its position, the pressure difference inside and outside the nanofiltration membrane during the filtration process can be adjusted, allowing the filtration system to adjust the pressure according to the filtration requirements and optimizing the filtration effect.

[0032] Based on the previous embodiment, continue to refer to Figure 2 , in one implementation, the pressurizing mechanism 13 includes: a driving component 21 and a pressing plate 23 fixedly connected along the output rod 22 of the driving component 21; the pressing plate 23 matches the shape of the inner cylinder 11.

[0033] Specifically, the driving component 21 is responsible for providing power, and transmits the power to the pressing plate 23 through its output rod 22 to realize the movement and positioning of the pressing plate 23. The pressing plate 23 is designed to completely match the shape of the inner cylinder 11 to ensure that uniform and effective pressure can be provided during the filtration process. The setting of the pressurizing mechanism 13 allows the system to flexibly adjust the pressure according to the change of filtration conditions, improving the filtration efficiency and product quality. For example, by precisely controlling the output of the driving component 21, the pressure exerted by the pressing plate 23 on the membrane filtering mechanism 14 can be precisely controlled to realize the fine adjustment of the filtration process.

[0034] Optionally, a sealing gasket can be provided on the contact surface between the pressing plate 23 and the inner cylinder 11 to ensure the sealing fit between the pressing plate 23 and the inner cylinder 11.

[0035] Based on the previous embodiment, in one implementation, the driving component 21 includes at least one of a driving hydraulic cylinder, an electric cylinder and a servo motor.

[0036] Specifically, the driving mode of the driving component 21 can be flexibly selected according to actual application requirements and system design to achieve the best filtration effect and system performance. Through a variety of flexible configurations of the driving component, the adjustable differential pressure membrane filtration system can adapt to different working conditions and filtration requirements, improving the reliability and applicability of the system.

[0037] In one implementation, the lower side wall of the inner cylinder 11 is provided with a porous structure; the membrane filtration mechanism 14 includes a metal mesh cylinder 31 wrapped with a nanofiltration membrane and a fixing member provided on the outer wall of the top end of the metal mesh cylinder 31, and the fixing member is hermetically attached to the side wall of the inner cylinder 11 through a gasket.

[0038] Specifically, the lower side wall of the inner cylinder 11 has a porous structure. After the dairy product is subjected to nanofiltration in the inner cylinder 11, it enters the outer cylinder 10 and the inner cylinder 11 again through the holes on its outer wall, and is further discharged through the communication mechanism 12. The metal mesh cylinder 31 is wrapped with a nanofiltration membrane, and the outer wall of the nanofiltration membrane is attached to the inner wall of the inner cylinder 2. The nanofiltration membrane is in a circular tube shape and can be fixed on the metal mesh cylinder 31, which is not shown in the figure. In this way, the dairy product can contact the metal mesh cylinder 31 and the nanofiltration membrane, and small molecule substances in the dairy product such as impurities, lactose, minerals, and part of the protein can pass through the nanofiltration membrane, separating the permeate containing impurities, lactose, minerals, and part of the protein, thereby realizing the nanofiltration operation. The fixing member can adopt common fixing members such as buckles, which are not shown in the figure, and the present application does not limit the type of the fixing member.

[0039] On the basis of the previous embodiment, in one implementation, the membrane filtration mechanisms 14 of the first filtration device 1, the second filtration device 2, and the third filtration device 3 are respectively provided with nanofiltration membranes having different cut-off molecular weights.

[0040] Specifically, the cut-off molecular weight refers to the molecular weight corresponding to a 90% rejection rate of the nanofiltration membrane for a specific molecule. The size of the cut-off molecular weight depends on the pore size, surface charge of the nanofiltration membrane, and the characteristics of the membrane material. In this embodiment, the membrane filtration mechanisms 14 of the first filtration device 1, the second filtration device 2, and the third filtration device 3 can be sequentially provided with nanofiltration membranes with gradually decreasing cut-off molecular weights, so as to improve the purity and quality of the dairy product. And setting nanofiltration membranes with different cut-off molecular weights can reduce the probability of nanofiltration membrane blockage, save the time for cleaning or replacing the nanofiltration membrane, and improve the nanofiltration efficiency.

[0041] In one implementation, the connection mechanism 12 includes: a first discharge port 41 that connects the cavities between the inner cylinder 11 and the outer cylinder 10, and a second discharge port 42 that connects the inner cylinder 11; the second discharge port 42 of the first filtration device 1 is connected to the feed port 15 of the second filtration device 2 through a pipeline; the second discharge port 42 of the second filtration device 2 is connected to the feed port 15 of the third filtration device 3 through a pipeline.

[0042] In this embodiment, the first discharge port 41 provided by the connection mechanism 12 outputs the first filtration product, and the second discharge port 42 is connected to the next-stage filtration device to re-filter the second filtration product. The particle size of the second filtration product is smaller than that of the first filtration product.

[0043] Figure 3 The connection mode of a controller according to an embodiment of the present application is shown. As Figure 3 shown, in one implementation, the first filtration device 1, the second filtration device 2, and the third filtration device 3 further each include: a pressure collector 17 connected to the membrane filtration mechanism 14 and a pressure sensor connected to the pressurization mechanism 13, and the pressure collector 17 includes a pre-membrane pressure gauge 171 and a post-membrane pressure gauge 172.

[0044] Specifically, in this embodiment, by setting the pressure collector 17, the readings of the pre-membrane pressure gauge 171 and the post-membrane pressure gauge 172 of the membrane filtration mechanism 14 are monitored in real time, so as to timely determine the pressure difference inside and outside the nanofiltration membrane, and the pressure sensor is set to monitor and feedback the pressure state of the pressurization mechanism 13 in real time.

[0045] Based on the previous embodiment, continue to refer to Figure 3 , in one implementation, the adjustable differential pressure membrane filtration system further includes: a controller 4 connected to each of the pressure collectors 17, each of the pressure sensors, and each of the pressurization mechanisms 13 of the first filtration device 1, the second filtration device 2, and the third filtration device 3, and a host computer 5 electrically connected to the controller 4.

[0046] In this embodiment, the controller 4 is set to comprehensively analyze the pressure data of the first filtering device 1, the second filtering device 2, and the third filtering device 3, and control the pressure of the pressurizing mechanism 13 based on the analysis data to adjust the membrane pressure difference of the nanofiltration membrane, so as to achieve the coordinated control of multi-stage filtration and improve the filtration efficiency and product quality of the entire adjustable pressure difference membrane filtration system. Exemplarily, when the pressure exceeds the preset safety range, the system can trigger an alarm through the controller 4 and automatically adjust the pressure or shut down for protection to prevent damage to the membrane filtration mechanism 14 or other failures. Further, the operator can set the pressure parameters through the upper computer 5 connected to the controller 4 and adjust the working states of the pressure collector 17, the pressure sensor, and the pressurizing mechanism 13 according to specific filtration requirements and material characteristics such as the pressure difference inside and outside the membrane.

[0047] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary and secondary relationship of the indicated technical features. The term "plurality" means more than two including two. Similarly, "multiple groups" means more than two groups including two groups, and "multiple pieces" means more than two pieces including two pieces.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adjustable pressure differential membrane filtration system, characterized in that: include: A first filter device (1), a second filter device (2), and a third filter device (3) connected in sequence from left to right; The first filtering device (1), the second filtering device (2) and the third filtering device (3) each comprise: An inner cylinder (11) disposed inside the outer cylinder (10); A communication mechanism (12) disposed at the bottom end of the outer cylinder (10); A pressurizing mechanism (13) disposed inside the inner cylinder (11) and moving longitudinally along the interior of the inner cylinder (11); A membrane filtering mechanism (14) disposed at the lower portion of the inner cylinder (11); A feed port (15) disposed at the upper end of the outer portion of the inner cylinder (11), and a first valve body (16) disposed on the feed port (15); Wherein, when the boosting mechanism (13) moves to the first position, the height is higher than the feed port (15), and when the boosting mechanism (13) moves to the second position, the height is lower than the feed port (15).

2. The adjustable pressure differential membrane filtration system according to claim 1, characterized in that: The boosting mechanism (13) comprises: a driving component (21) and a pressure plate (23) fixedly connected along an output rod (22) of the driving component (21); the pressure plate (23) matches the shape of the inner cylinder (11).

3. The adjustable pressure differential membrane filtration system according to claim 2, characterized in that: The driving component (21) comprises at least one of a driving hydraulic cylinder, an electric cylinder and a servo motor.

4. The adjustable pressure differential membrane filtration system according to claim 1, characterized in that: The lower side wall of the inner cylinder (11) is configured as a porous structure; The membrane filtration mechanism (14) comprises a metal mesh cylinder (31) wrapped with a nanofiltration membrane and a fixing member arranged on the outer wall of the top end of the metal mesh cylinder (31), wherein the fixing member is sealed to the side wall of the inner cylinder (11) via a sealing gasket.

5. The adjustable pressure differential membrane filtration system according to claim 4, characterized in that: The membrane filtration mechanisms (14) of the first filtration device (1), the second filtration device (2) and the third filtration device (3) are respectively provided with nanofiltration membranes having different molecular weight cut-offs.

6. The adjustable pressure differential membrane filtration system according to claim 1, characterized in that: The communication mechanism (12) comprises: a first discharge port (41) communicating with the cavity between the inner cylinder (11) and the outer cylinder (10), and a second discharge port (42) communicating with the inner cylinder (11); The second discharge port (42) of the first filter device (1) is connected to the feed port (15) of the second filter device (2) through a pipeline; the second discharge port (42) of the second filter device (2) is connected to the feed port (15) of the third filter device (3) through a pipeline.

7. The adjustable pressure differential membrane filtration system according to claim 1, characterized in that: The first filtering device (1), the second filtering device (2) and the third filtering device (3) also each comprise: a pressure collector (17) connected to the membrane filtering mechanism (14) and a pressure sensor connected to the pressurizing mechanism (13), wherein the pressure collector (17) comprises a pre-membrane pressure gauge (171) and a post-membrane pressure gauge (172).

8. The adjustable pressure differential membrane filtration system according to claim 7, characterized in that: The adjustable differential pressure membrane filtration system further comprises: the pressure collectors (17) connected to the first filtration device (1), the second filtration device (2) and the third filtration device (3), the pressure sensors and the controllers (4) of the pressure boosting mechanisms (13), and a host computer (5) electrically connected to the controllers (4).

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