Filtering device for biochemical examination

Abstract

This utility model belongs to the field of biochemical testing technology, specifically relating to a filtration device for biochemical testing. It includes a filter flask and a liquid outlet pipe installed on one side of the bottom of the filter flask. One end of the liquid outlet pipe is connected to a flexible tube, and the other end of the flexible tube is connected to a pressure gauge. The other end of the pressure gauge is connected to a vacuum pump. A sealing plug is connected to the top opening of the filter flask, and a guide tube is threaded through the surface of the sealing plug. The top of the guide tube connects to a filter chamber, and a chamber cover is threaded onto the surface of the filter chamber. This utility model places stacked filter membranes in a positioning frame, and then slides the guide groove on the outside of the positioning frame along the guide block on the inner wall of the filter chamber to stabilize the filter membranes. The chamber cover is then sealed to the filter chamber. This ensures the filtration effect and quality during biochemical testing, improving the accuracy of subsequent test data.

Description

Technical Field

[0001] This utility model belongs to the field of biochemical testing technology, and specifically relates to a filtration device for biochemical testing. Background Technology

[0002] Biochemical testing filtration devices are specialized equipment used in biochemical testing processes to separate, purify, sterilize, or remove particulate impurities from samples (such as blood, urine, cell culture media, and biological reagents). Their core function is to separate target components from impurities in the sample through the selective retention of the filter membrane, ensuring the accuracy and reliability of test results. They are widely used in clinical laboratories, biopharmaceuticals, research institutes, and other fields. Filtration is achieved by applying external force (such as manual pressurization, vacuum pumps, pressure pumps, etc.) to push the sample through a filter membrane. During biochemical testing, a suitable filter membrane material and pore size are selected based on the sample properties. The filter membrane is installed in the filtration chamber, ensuring a good seal, before injecting the sample into the filtration chamber and connecting it to a pressure source or centrifuge. Common biochemical testing filtration devices on the market generally use filter membranes with a single structural design. Current mainstream products simply lay a planar filter membrane directly in the support frame or wall groove of the filtration chamber, lacking a refined limiting and fixing structure. This traditional assembly method has significant drawbacks: during pressure-driven filtration (such as vacuum filtration, pressure filtration) or centrifugal filtration, the filter membrane is prone to lateral displacement, wrinkling, or even partial detachment due to fluid impact or centrifugal force. This can lead to filtration path deviation, sample leakage, or filter membrane damage, resulting in decreased filtration accuracy. Large particles can then bypass the filter membrane and enter the filtrate, affecting not only the accuracy of test results but also potentially increasing the consumption of experimental consumables and operational risks. Utility Model Content

[0003] The purpose of this invention is to provide a filtration device for biochemical testing, aiming to solve the problem that in the above-mentioned filtration devices of the prior art, during pressure-driven filtration (such as vacuum filtration, pressure filtration) or centrifugal filtration, the filter membrane is prone to lateral displacement, wrinkling or even partial detachment due to fluid impact force or centrifugal force, resulting in filtration path deviation, sample leakage or filter membrane damage, leading to a decrease in filtration accuracy, and large particulate impurities entering the filtrate around the filter membrane, which not only affects the accuracy of test results, but may also increase the consumption of experimental consumables and operational risks.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a filtration device for biochemical testing, comprising a filter flask and a liquid outlet pipe installed on one side of the bottom of the filter flask, wherein the other end of one side of the liquid outlet pipe is connected to a flexible tube, the other end of the flexible tube is connected to a pressure gauge, and the other end of the pressure gauge is connected to a vacuum pump. The top opening of the filter flask is connected to a sealing plug, and a flow guide tube is connected through the surface of the sealing plug. The top of the flow guide tube is connected to a filter chamber, and a chamber cover is threaded onto the surface of the filter chamber. A feed tank is connected to the surface of the chamber cover. A positioning frame is installed inside the filter chamber, and a filter membrane is installed inside the positioning frame. A guide block is connected to the inner wall of the filter chamber, and a guide groove is provided on the outer side of the positioning frame near the guide block.

[0005] As a preferred embodiment of the biochemical testing filtration device of this utility model, the filter membrane is made of a mixed cellulose ester material, wherein the mixed cellulose ester material is made of a mixture of cellulose acetate and cellulose nitrate, and the filter membrane is made by stacking layers.

[0006] As a preferred embodiment of the filtration device for biochemical testing according to this utility model, the inner wall dimension of the guide groove on the outer side of the positioning frame is adapted to the surface dimension of the guide block, and the positioning frame and the guide block form a sliding connection structure through the guide groove.

[0007] As a preferred embodiment of the filtration device for biochemical testing according to this utility model, a sealing ring is installed on the surface of the top connection of the filter chamber, and the sealing ring is made of silicone.

[0008] As a preferred embodiment of the filtration device for biochemical testing according to this utility model, a bottom block is connected to the side surface of the air pump, a fixed block is connected to the surface of the bottom block, a movable sleeve is slidably connected to the surface of the fixed block, and a portable handle is connected to the inner side of the movable sleeve.

[0009] As a preferred embodiment of the filtration device for biochemical testing according to this utility model, a limiting block is connected to one side of the fixed block. The limiting block has a T-shaped structure, and locking bolts are connected through the two ends of the limiting block. A locking groove is provided on the side surface of the movable sleeve plate near the locking bolt.

[0010] Compared with the prior art, the beneficial effects of this utility model are: This invention places the superimposed filter membrane in a positioning frame, and then slides the guide groove on the outside of the positioning frame along the guide block on the inner wall of the filter chamber to stabilize the filter membrane. At this time, the chamber cover is sealed to the filter chamber. When performing biochemical testing filtration, the filtration effect and quality are guaranteed, and the accuracy of subsequent test data is improved. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall connection structure of the filter device of this utility model; Figure 2 This is a schematic cross-sectional view of the filter flask of this utility model. Figure 3 This is an exploded view of the positioning frame of this utility model; Figure 4 This is a schematic diagram of the portable handle mounting structure of this utility model; Figure 5 This is an enlarged structural diagram of point A of this utility model.

[0012] In the diagram: 1. Filter flask; 2. Liquid outlet pipe; 3. Vacuum pipe; 4. Flexible hose; 5. Pressure gauge; 6. Vacuum pump; 7. Sealing plug; 8. Flow guide pipe; 9. Filter chamber; 10. Chamber cover; 11. Feed tank; 12. Positioning frame; 13. Filter membrane; 14. Guide block; 15. Sealing ring; 16. Guide groove; 17. Bottom block; 18. Fixing block; 19. Movable sleeve; 20. Portable handle; 21. Limiting block; 22. Locking bolt; 23. Locking groove. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1-5 The present invention provides the following technical solution: a filtration device for biochemical testing, comprising a filter flask 1 and an outlet pipe 2 installed on one side of the bottom of the filter flask 1, the other end of the outlet pipe 2 being connected to a hose 4, the other end of the hose 4 being connected to a pressure gauge 5, and the other end of the pressure gauge 5 being connected to a vacuum pump 6. A sealing plug 7 is connected to the top opening of the filter flask 1. A flow guide tube 8 is connected through the surface of the sealing plug 7. The top of the flow guide tube 8 is connected to the filter chamber 9. A chamber cover 10 is threadedly connected to the surface of the filter chamber 9. A feed tank 11 is connected to the surface of the chamber cover 10. A positioning frame 12 is installed inside the filter chamber 9. A filter membrane 13 is installed inside the positioning frame 12. A guide block 14 is connected to the inner wall of the filter chamber 9. A guide groove 16 is opened on the outer side of the positioning frame 12 near the guide block 14.

[0015] Preferably, the filter membrane 13 is made of a mixed cellulose ester material, wherein the mixed cellulose ester material is made of a mixture of cellulose acetate and cellulose nitrate, and the filter membrane 13 is made by stacking layers.

[0016] Preferably, the inner wall dimensions of the guide groove 16 on the outer side of the positioning frame 12 are adapted to the surface dimensions of the guide block 14, and the positioning frame 12 and the guide block 14 form a sliding connection structure through the guide groove 16.

[0017] In practical use, the filter membrane 13 is easily positioned and assembled by sliding the guide groove 16 on the outer wall of the positioning frame 12 along the guide block 14, avoiding deviation due to negative pressure, and facilitating subsequent disassembly, cleaning and replacement.

[0018] Preferably, a sealing ring 15 is installed on the surface of the top connection of the filter chamber 9, and the sealing ring 15 is made of silicone.

[0019] In practical use, the use of sealing ring 15 ensures the overall sealing of the filter device, facilitates the stability of the subsequent negative pressure effect, and improves the filtration effect.

[0020] Preferably, the side surface of the air pump 6 is connected to a base block 17, the surface of the base block 17 is connected to a fixing block 18, the surface of the fixing block 18 is slidably connected to a movable sleeve 19, and the inner side of the movable sleeve 19 is connected to a portable handle 20.

[0021] In practical use, by adjusting the movable sleeve 19 up and down along the fixed block 18, the portable handle 20 can be moved synchronously, improving the portability of the air pump 6.

[0022] Preferably, a limiting block 21 is connected to one side of the fixed block 18. The limiting block 21 has a T-shaped structure. Locking bolts 22 are connected through the two ends of the limiting block 21. A locking groove 23 is provided on the side of the movable sleeve plate 19 near the locking bolts 22.

[0023] In practical use, the limiting block 21 is always slid along the opening on one side of the movable sleeve 19 to ensure the stability of the up and down movement of the movable sleeve 19. The use of the locking bolt 22 makes it easy to adjust the portable handle 20 up and down as needed.

[0024] The working principle of this utility model in specific use is as follows: First, the superimposed filter membrane 13 is placed in the positioning frame 12. Then, the guide groove 16 on the outside of the positioning frame 12 slides and connects with the guide block 14 on the inner wall of the filter chamber 9, thereby limiting and stabilizing the filter membrane 13. At this time, the chamber cover 10 is sealed to the filter chamber 9. The biochemical sample to be filtered is poured into the feed tank 11. At the same time, the vacuum pump 6 is started to generate negative pressure in the filter flask 1, which accelerates the filtration effect. At this time, the filter membrane 13 inside the positioning frame 12 continuously and stably filters the biochemical sample. The filter avoids deviation and movement due to negative pressure, ensuring the filtration effect and quality during biochemical testing and improving the accuracy of subsequent test data. In addition, by moving the movable sleeve 19 upward on the surface of the fixed block 18, the portable handle 20 is height adjusted, and the limiting block 21 slides along the opening on the surface of the movable sleeve 19. Then, the locking bolt 22 is threaded through the limiting block 21 and tightened into the locking groove 23 on the surface of the movable sleeve 19, thereby facilitating the stability of the portable handle 20 and improving the convenience of transferring the air pump 6.

[0025] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A filtering device for biochemical examination, comprising a filtering flask (1) and a liquid outlet pipe (2) installed on one side of the bottom end of the filtering flask (1), characterized in that: One end of the outlet pipe (2) is connected to a hose (4), the other end of the hose (4) is connected to a pressure gauge (5), and the other end of the pressure gauge (5) is connected to a vacuum pump (6); a sealing plug (7) is connected to the top opening of the filter flask (1), a guide pipe (8) is connected through the surface of the sealing plug (7), the top end of the guide pipe (8) is connected to a filter chamber (9), the surface of the filter chamber (9) is threadedly connected to a chamber cover (10), the surface of the chamber cover (10) is connected to a feed tank (11), a positioning frame (12) is installed inside the filter chamber (9), a filter membrane (13) is installed inside the positioning frame (12), a guide block (14) is connected to the inner wall of the filter chamber (9), and a guide groove (16) is opened on the outer side of the positioning frame (12) near the guide block (14). 2.The biochemical test filtering device according to claim 1, characterized in that: The filter membrane (13) is made by stacking layers. 3.The biochemical test filtering device according to claim 1, characterized in that: The inner wall dimension of the guide groove (16) on the outer side of the positioning frame (12) is adapted to the surface dimension of the guide block (14). The positioning frame (12) and the guide block (14) form a sliding connection structure through the guide groove (16).

4. The filtering device for biochemical examination according to claim 1, characterized in that: A sealing ring (15) is installed on the surface of the top connection of the filter chamber (9), and the sealing ring (15) is made of silicone.

5. The filtering device for biochemical examination according to claim 1, characterized in that: The side surface of the air pump (6) is connected to a base block (17), the surface of the base block (17) is connected to a fixing block (18), the surface of the fixing block (18) is slidably connected to a movable sleeve plate (19), and the inner side of the movable sleeve plate (19) is connected to a portable handle (20).

6. The filtering device for biochemical examination according to claim 5, characterized in that: One side of the fixed block (18) is connected to a limiting block (21). The limiting block (21) has a T-shaped structure. Locking bolts (22) are connected through the two ends of the limiting block (21). A locking groove (23) is opened on the side surface of the movable sleeve plate (19) near the locking bolt (22).

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