A fine filtration device

Abstract

This invention provides a fine filtration device, including a collection box and a filtration mechanism on its top. The filtration mechanism includes a fixed cylinder, an adjusting sealing sleeve, a collection cylinder, and a polymer filter membrane. The fixed cylinder is fixedly connected to the center of the top of the collection box, and the adjusting sealing sleeve is slidably disposed on the outer side of the bottom end of the fixed cylinder. The collection cylinder concentrates the filtered microorganisms in the middle of the upper surface of the polymer filter membrane. A lifting mechanism consisting of a bidirectional screw, a first limiting block, and a second limiting block allows for the separation and adjustment of the adjusting sealing sleeve and the collection cylinder, exposing the polymer filter membrane. This facilitates the removal of the polymer filter membrane, avoiding any impact on the microorganisms on its surface during removal, ensuring the accuracy of subsequent microbial culture and detection, and improving the practicality of the device.

Description

Technical Field

[0001] This utility model relates to the field of fine filtration technology for microbial culture, specifically a fine filtration device. Background Technology

[0002] In order to ensure the purity and sterility of the microbial culture environment and improve the success rate and purity of microorganisms, fine filtration of microorganisms is necessary during the microbial culture process. Microbial fine filtration uses membrane filtration, which traps microbial particles in the fluid through a filter membrane with a specific pore size, facilitating subsequent detection of microorganisms. The filter membrane itself has selective permeability; samples such as water can pass through the filter membrane after being vacuum-filtered, while microorganisms remain on the surface of the filter membrane.

[0003] Chinese invention patent CN118006442B discloses a fine filtration device for microbial culture, comprising a vacuum pump, a long tube, and a discharge tube mounted on the main body of the filtration device. It also includes a hollow annular cover positioned above the discharge tube, with multiple arrayed absorption holes on the inner wall of the annular cover. By placing the filter membrane inside a perforated disc, the filter membrane can be fixed and positioned using a filter cup and the perforated disc. However, when using the filter membrane for fine filtration of microorganisms, the microorganisms adhere to the entire surface of the filter membrane. Because the perforated disc has a certain depth, removing the filter membrane can affect the microorganisms on its surface, causing contamination and potentially affecting the final test results, thus reducing its practicality.

[0004] Therefore, this utility model provides a fine filtration device. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a fine filtration device to solve the problems mentioned in the background section. This invention uses a lifting mechanism to separate and adjust the sealing sleeve and the collection cylinder, thereby exposing the polymer filter membrane. Furthermore, the collection cylinder concentrates the filtered microorganisms in the middle of the upper surface of the polymer filter membrane, facilitating the removal of the polymer filter membrane and avoiding any impact on the microorganisms on its surface during removal. This ensures the accuracy of subsequent microbial culture and detection, and improves the practicality of the device.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fine filtration device, comprising a collection box and a filtration mechanism on its top, the filtration mechanism comprising a fixed cylinder, an adjusting sealing sleeve, a collection cylinder, and a polymer filter membrane, the fixed cylinder being fixedly connected to the center of the top of the collection box, the adjusting sealing sleeve being slidably disposed on the outside of the bottom end of the fixed cylinder, the collection cylinder being movably disposed directly above the fixed cylinder via a lifting mechanism, a placement groove being provided inside the top of the fixed cylinder, a support net being fixedly disposed at the bottom of the inner side of the placement groove, the polymer filter membrane being placed on the top of the support net corresponding to the inner side of the placement groove, and the lifting mechanism comprising a fixed frame, a first limiting block, and a second limiting block.

[0007] Furthermore, the fixing frame is U-shaped and is fixedly installed on the top of the collection box on one side corresponding to the fixing cylinder.

[0008] Furthermore, the internal limiting rotation of the fixing frame is equipped with a bidirectional screw, and a handwheel is fixedly installed at the top of the bidirectional screw corresponding to the top of the fixing frame. The first limiting block and the second limiting block are respectively screwed to the bottom and top of the bidirectional screw through screw holes opened inside them.

[0009] Furthermore, the first limiting block and the second limiting block are in the shape of an I-beam, and the first limiting block and the second limiting block are slidably installed on the bottom and top of the inner side of the fixing frame.

[0010] Furthermore, a fixing rod is fixedly connected between one end of the first limiting block and the outer wall of the adjusting sealing sleeve, and a fixing rod is fixedly connected between one end of the second limiting block and the outer wall of the collecting cylinder.

[0011] Furthermore, a sealing ring is fixedly provided on the inner wall of the adjusting sealing sleeve, the sealing ring is attached to the outer wall of the top end of the fixed cylinder, and the polymer filter membrane is disposed on the inner side of the adjusting sealing sleeve.

[0012] Furthermore, a sealing gasket is fixedly provided inside the inner wall of the bottom end of the collecting cylinder, the bottom end of the collecting cylinder is in contact with the adjusting sealing sleeve and the outer end of the polymer filter membrane, and the sealing gasket is provided on the top of the polymer filter membrane.

[0013] Furthermore, a vacuum pump is fixedly installed on one side of the outer wall of the collection box, and a connecting pipe is fixedly connected between the inlet of the vacuum pump and the collection box. A discharge pipe is fixedly connected to the bottom of the other side of the collection box, and valves are installed on both the connecting pipe and the discharge pipe.

[0014] The beneficial effects of this utility model are as follows: This fine filtration device allows for the raising and lowering adjustment of the first and second limiting blocks via a handwheel and a bidirectional screw. This facilitates the raising and lowering of the adjusting sealing sleeve and collecting cylinder via the first and second limiting blocks and a fixing rod. Adjusting the sealing sleeve and collecting cylinder clamps and limits the polymer filter membrane, and the supporting net further supports the membrane, improving its stability and facilitating microbial filtration. The collecting cylinder concentrates the filtered microorganisms in the center of the polymer filter membrane's surface. The bidirectional screw, first and second limiting blocks, and other lifting mechanisms allow for the separation and adjustment of the adjusting sealing sleeve and collecting cylinder, exposing the polymer filter membrane and facilitating its removal. This avoids affecting the microorganisms on the membrane surface during removal, ensuring the accuracy of subsequent microbial culture and detection, and improving the device's practicality. The collecting box collects filtered water and other samples, and after filtration, the water is discharged through a drain pipe and valve. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a fine filtration device according to the present invention;

[0016] Figure 2 This is a front cross-sectional view of a fine filtration device according to the present invention;

[0017] Figure 3 This utility model relates to a fine filtration device. Figure 3 Enlarged view of point A in the middle;

[0018] Figure 4 This is a cross-sectional view of the adjustment state of a fine filtration device according to the present invention;

[0019] Figure 5 This is a structural diagram of a partial structure of a fine filtration device according to the present invention;

[0020] Figure 6 This is a cross-sectional view of a partial structure of a fine filtration device according to the present invention;

[0021] In the diagram: 1. Collection box; 2. Vacuum pump; 3. Connecting pipe; 4. Discharge pipe; 5. Fixing cylinder; 6. Adjusting sealing sleeve; 7. Collection cylinder; 8. Fixing frame; 9. Bidirectional screw; 10. First limiting block; 11. Second limiting block; 12. Support net; 13. Polymer filter membrane; 14. Sealing ring; 15. Sealing gasket. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Please see Figures 1 to 6 This utility model provides a technical solution: a fine filtration device, including a collection box 1 and a filtration mechanism on its top. The filtration mechanism includes a fixed cylinder 5, an adjusting sealing sleeve 6, a collection cylinder 7, and a polymer filter membrane 13. The fixed cylinder 5 is fixedly connected to the center of the top of the collection box 1. The adjusting sealing sleeve 6 is slidably disposed on the outer side of the bottom end of the fixed cylinder 5. The collection cylinder 7 is movably disposed directly above the fixed cylinder 5 via a lifting mechanism. A placement groove is opened inside the top of the fixed cylinder 5. A support net 12 is fixedly disposed at the bottom of the inner side of the placement groove. The polymer filter membrane 13 is placed on the top of the support net 12 corresponding to the inner side of the placement groove. The lifting mechanism includes a fixed frame 8, a first limiting block 10, and a second limiting block 11. The lifting mechanism separates and adjusts the adjusting sealing sleeve 6 and the collection cylinder 7, making it easy to expose the polymer filter membrane 13 and remove it. The removal process does not affect the microorganisms on the surface of the polymer filter membrane 13, facilitating subsequent microbial cultivation and detection. It has high practicality.

[0024] In this embodiment, the fixing frame 8 is U-shaped and is fixedly installed on the top of the collection box 1, corresponding to the side of the fixing cylinder 5. A bidirectional screw 9 is rotatably mounted inside the fixing frame 8, and a handwheel is fixedly installed at the top of the bidirectional screw 9 above the fixing frame 8. The first limiting block 10 and the second limiting block 11 are screwed onto the bottom and top of the bidirectional screw 9 respectively through screw holes inside. The first limiting block 10 and the second limiting block 11 are I-shaped and are slidably mounted inside the fixing frame 8. At the bottom and top of the side, a fixing rod is fixedly connected between one end of the first limiting block 10 and the outer wall of the adjusting sealing sleeve 6, and a fixing rod is fixedly connected between one end of the second limiting block 11 and the outer wall of the collecting cylinder 7. The fixing frame 8 can limit the movement of the first limiting block 10 and the second limiting block 11, which can improve the stability of the adjusting sealing sleeve 6 and the collecting cylinder 7. The first limiting block 10 and the second limiting block 11 can be raised and lowered by the handwheel and the bidirectional screw 9, which can facilitate the fixing and separation of the polymer filter membrane 13, and facilitate the subsequent filtration of microbial samples and removal of the polymer filter membrane 13.

[0025] In this embodiment, a sealing ring 14 is fixedly disposed on the inner wall of the adjusting sealing sleeve 6. The sealing ring 14 is attached to the outer wall of the top end of the fixed cylinder 5. The polymer filter membrane 13 is disposed inside the adjusting sealing sleeve 6. A sealing gasket 15 is fixedly disposed inside the inner wall of the bottom end of the collecting cylinder 7. The bottom end of the collecting cylinder 7 is in contact with the outer end of the adjusting sealing sleeve 6 and the polymer filter membrane 13. The sealing gasket 15 is disposed on the top of the polymer filter membrane 13. The sealing ring 14 can improve the sealing between the adjusting sealing sleeve 6 and the fixed cylinder 5. The sealing gasket 15 and the collecting cylinder 7 can limit the microorganisms, so that the microorganisms are concentrated in the center of the polymer filter membrane 13, which makes it convenient to remove the polymer filter membrane 13 later.

[0026] In this embodiment, a vacuum pump 2 is fixedly installed on one outer wall of the collection box 1. A connecting pipe 3 is fixedly connected between the inlet of the vacuum pump 2 and the collection box 1. A discharge pipe 4 is fixedly connected to the bottom of the other side of the collection box 1. Valves are installed on both the connecting pipe 3 and the discharge pipe 4. The vacuum pump 2 can discharge the air inside the collection box 1, which facilitates the filtration and separation of samples under the negative pressure inside the collection box 1, thereby improving the fine filtration efficiency of microorganisms. In addition, the discharge pipe 4 and the valve can discharge the water and other substances collected inside the collection box 1.

[0027] When using this fine filtration device, select a polymer filter membrane 13 with the corresponding pore size according to the type of microorganisms to be filtered, and cut the polymer filter membrane 13 to match the inner diameter of the adjusting sealing sleeve 6. Thoroughly disinfect and sterilize the polymer filter membrane 13 and the device. Turn the handwheel and the bidirectional screw 9. The bidirectional screw 9 screws and drives the first limiting block 10 and the second limiting block 11 to slide up and down inside the fixed frame 8. The first limiting block 10 and the second limiting block 11 drive the adjusting sealing sleeve 6 and the collection cylinder 7 to move away from each other through the fixing rod, exposing the upper end of the fixed cylinder 5. Place the treated polymer filter membrane 13 on top of the fixed cylinder 5 and the support net 12, and adjust the high-resolution filter membrane. Positioning of the sub-filter membrane 13: Reverse rotation of the handwheel and bidirectional screw 9, through the limiting action of the fixing frame 8, the first limiting block 10, and the second limiting block 11, causes the fixing rod, the adjusting sealing sleeve 6, and the collecting cylinder 7 to move closer together. The adjusting sealing sleeve 6 slides on the outside of the fixing cylinder 5 and moves upward, allowing the polymer filter membrane 13 to enter the interior of the adjusting sealing sleeve 6. The collecting cylinder 7 moves downward and squeezes the polymer filter membrane 13 through the sealing gasket 15. This facilitates the clamping and limiting of the polymer filter membrane 13 through the adjusting sealing sleeve 6 and the collecting cylinder 7, and the support net 12 supports the polymer filter membrane 13, thus improving its stability. Close the valve on the discharge pipe 4. Open the valve on the connecting pipe 3, and simultaneously start the vacuum pump 2 through its matching circuit. The vacuum pump 2 evacuates the inside of the collection box 1 through the connecting pipe 3 and the valve. Since the discharge pipe 4 is in a closed state, outside air enters the inside of the collection box 1 through the collection cylinder 7, the polymer filter membrane 13, the support net 12, and the fixing cylinder 5 under the negative pressure inside the collection box 1. Pour the sample into the inside of the collection cylinder 7. Under the action of negative pressure, it is convenient to quickly filter microorganisms and water. Water and other substances enter the collection box 1, while microorganisms remain on the upper surface of the polymer filter membrane 13, which is convenient for filtering microorganisms. After filtration, rinse the surface of the polymer filter membrane 13 with clean water. The material is rinsed; the arrangement of the collection cylinder 7 and the sealing gasket 15 can concentrate the filtered microorganisms in the middle position of the upper surface of the polymer filter membrane 13. After rinsing, the vacuum pump 2 is turned off, and the lifting mechanism such as the first limit block 10 and the second limit block 11 is moved by the handwheel and the bidirectional screw 9 to separate and adjust the adjusting sealing sleeve 6 and the collection cylinder 7 to expose the polymer filter membrane 13. This facilitates the removal of the polymer filter membrane 13 and avoids affecting the microorganisms on its surface during the removal process, ensuring the accuracy of subsequent microbial culture and detection, and improving the practicality of the device. After removing the polymer filter membrane 13, the valve on the discharge pipe 4 is opened to drain the water.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fine filtration device, comprising a collection box (1) and a filtration mechanism disposed on its top, characterized in that, The filtration mechanism includes a fixed cylinder (5), an adjusting sealing sleeve (6), a collecting cylinder (7), and a polymer filter membrane (13). The fixed cylinder (5) is fixedly connected to the center of the top of the collecting box (1). The adjusting sealing sleeve (6) is slidably disposed on the outside of the bottom end of the fixed cylinder (5). The collecting cylinder (7) is movably disposed directly above the fixed cylinder (5) through a lifting mechanism. A placement groove is provided inside the top of the fixed cylinder (5). A support net (12) is fixedly disposed at the bottom of the inner side of the placement groove. The polymer filter membrane (13) is placed on the top of the support net (12) corresponding to the inner side of the placement groove. The lifting mechanism includes a fixed frame (8), a first limiting block (10), and a second limiting block (11).

2. The fine filtration device according to claim 1, characterized in that: The fixing frame (8) is U-shaped and is fixedly installed on the top of the collection box (1) on one side corresponding to the fixing cylinder (5).

3. The fine filtration device according to claim 2, characterized in that: The fixed frame (8) is internally limited and rotatably mounted with a bidirectional screw (9). A handwheel is fixedly installed at the top of the bidirectional screw (9) corresponding to the top of the fixed frame (8). The first limiting block (10) and the second limiting block (11) are respectively screwed to the bottom and top of the bidirectional screw (9) through screw holes opened inside them.

4. The fine filtration device according to claim 3, characterized in that: The first limiting block (10) and the second limiting block (11) are in the shape of an I-beam. The first limiting block (10) and the second limiting block (11) are slidably mounted on the bottom and top of the inner side of the fixing frame (8).

5. A fine filtration device according to claim 4, characterized in that: One end of the first limiting block (10) is fixedly connected to the outer wall of the adjusting sealing sleeve (6) with a fixing rod, and one end of the second limiting block (11) is fixedly connected to the outer wall of the collecting cylinder (7) with a fixing rod.

6. A fine filtration device according to claim 1, characterized in that: A sealing ring (14) is fixedly provided on the inner wall of the adjusting sealing sleeve (6). The sealing ring (14) is attached to the outer wall of the top of the fixed cylinder (5). The polymer filter membrane (13) is provided on the inner side of the adjusting sealing sleeve (6).

7. A fine filtration device according to claim 6, characterized in that: A sealing gasket (15) is fixedly installed inside the inner wall of the bottom end of the collecting cylinder (7). The bottom end of the collecting cylinder (7) is in contact with the adjusting sealing sleeve (6) and the outer end of the polymer filter membrane (13). The sealing gasket (15) is set on the top of the polymer filter membrane (13).

8. A fine filtration device according to claim 1, characterized in that: A vacuum pump (2) is fixedly installed on one side of the outer wall of the collection box (1). A connecting pipe (3) is fixedly connected between the inlet of the vacuum pump (2) and the collection box (1). A discharge pipe (4) is fixedly connected to the bottom of the other side of the collection box (1). Valves are installed on both the connecting pipe (3) and the discharge pipe (4).

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