Microbial limit test filtration device

Abstract

The utility model discloses a kind of microbial limit detection filtering devices, including box, vacuum pump is installed on box, vacuum pump is communicated with box, further include collecting barrel, support pipe, liquid inlet pipe, mounting mechanism and filtering mechanism, multiple collecting barrels are fixedly arranged in box, the lateral wall of collecting barrel is communicated and is provided with drainage pipe, the end of drainage pipe away from collecting barrel projects box, electric control valve is installed on drainage pipe, the top lateral wall of box is located in the top side of collecting barrel and is fixedly provided with support pipe and penetrates, liquid inlet pipe is arranged on the top lateral wall of support pipe, the top end of liquid inlet pipe is cooperated and mounted with sealing cover by screw thread, mounting mechanism is arranged between liquid inlet pipe and support pipe, the microbial limit detection filtering device is used to solve the problem that filter membrane in prior art is prone to wrinkle or position deviation when being impacted by to-be-measured liquid, and the filtering effect is affected.

Description

Technical Field

[0001] This utility model relates to the technical field of microbial limit detection filtration devices, specifically to a microbial limit detection filtration device. Background Technology

[0002] Microbial limit testing filtration devices are core laboratory equipment used for testing the microbial limits in samples such as pharmaceuticals, food, cosmetics, and medical devices. Their core function is to trap microorganisms in the sample on the surface of the filter membrane through filtration and separation, and then, in conjunction with subsequent culture and counting, achieve accurate detection of the degree of microbial contamination in the sample.

[0003] Its working principle is to use a filter membrane with a specific pore size (usually 0.45 μm, which can effectively retain common microorganisms such as bacteria; larger pore size filter membranes may be used for fungal detection) as a separation medium. The sample to be tested (liquid samples are processed directly, while solid samples need to be prepared into a suspension) is forced through the filter membrane by negative pressure suction or positive pressure pushing. At this time, the microorganisms in the sample are retained on the surface of the filter membrane, while solvents, soluble impurities, etc., are discharged through the filter membrane. The filter membrane containing the retained microorganisms is then transferred to a corresponding culture medium for incubation, and finally, the microbial limit of the sample is determined by counting the number of colonies.

[0004] Microbial limit testing filtration devices generally consist of gaskets, filter membranes, gaskets, filter cups, screw caps, and cup caps. The installation steps for the filter are typically: soaking the filter membrane, placing the gaskets, placing the filter membrane and gaskets, inserting the filter cup and screw caps, and sealing the cup cap.

[0005] Currently, when conducting microbial limit tests on food, after the filter is assembled, the liquid to be tested is fed into the filter cup, and the top of the filter cup is sealed. However, in actual practice, when the liquid to be tested is poured directly into the filter cup, the liquid will impact the surface of the filter membrane, which can easily cause the filter membrane to wrinkle or deform, thereby damaging the sealing performance between the filter membrane and the filter cup and affecting the filtration effect. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides a microbial limit detection filtration device, which solves the problem mentioned in the background art that the filter membrane of the prior art is prone to wrinkling or displacement when subjected to the impact of the liquid to be tested, thus affecting the filtration effect.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a microbial limit detection filtration device, comprising a housing, a vacuum pump installed on the housing and connected to the housing, and further comprising a collection bucket, a support tube, an inlet pipe, an installation mechanism, and a filtration mechanism. Multiple collection buckets are fixedly disposed within the housing. A drain pipe is connected to the side wall of each collection bucket, with one end of the drain pipe extending out of the housing away from the collection bucket. An electric control valve is installed on the drain pipe. The support tube is fixedly disposed through the top side wall of the housing, located on the top side of the collection bucket. The inlet pipe is disposed on the top side wall of the support tube, and a sealing cover is threaded onto the top end of the inlet pipe. The installation mechanism is disposed between the inlet pipe and the support tube for installing and fixing the inlet pipe and the support tube. The filtration mechanism is disposed between the inlet pipe and the support tube for filtering liquid samples.

[0010] Preferably, the filtration mechanism includes a mounting groove, a mounting cover, a filter membrane, and a sealing ring. The mounting groove is located at the top of the inner wall of the support tube. The mounting cover is slidably disposed within the mounting groove. The bottom sidewall of the mounting cover has multiple drainage holes. The filter membrane is disposed within the mounting cover and its shape is adapted to the inner wall of the mounting groove. The sealing ring is fixedly disposed on the sidewall of the inlet pipe. The cross-section of the sealing ring is L-shaped, and the bottom sidewall of the sealing ring abuts against the filter membrane.

[0011] Furthermore, a sealing ring is fixedly provided on the bottom side wall of the sealing ring.

[0012] Furthermore, the installation mechanism includes a first mounting ring, a second mounting ring, a positioning seat, and a positioning mechanism. The first mounting ring is fixedly disposed on the outer wall of the support tube, and the second mounting ring is fixedly disposed on the bottom side wall of the inlet tube. The second mounting ring has multiple positioning holes. The positioning seat is fixedly disposed on the top side wall of the first mounting ring on one side of the positioning hole. The positioning seat passes through the positioning hole. The positioning mechanism is disposed on the positioning seat and is used to position the positioning seat and the second mounting ring.

[0013] Furthermore, the positioning mechanism includes a first cavity, a first gear, a moving block, a threaded rod, and a synchronous rotation mechanism. The first cavity is formed within the positioning seat, and limit openings are formed on two opposite sidewalls of the first cavity. The first gear is rotatably disposed within the limit openings. A positioning block is fixedly disposed on the sidewall of the first gear. The moving block is slidably disposed within the first cavity. A first rack is fixedly disposed on the sidewall of the moving block near the first gear, and the first rack meshes with the first gear. The threaded rod is rotatably disposed within the first cavity and passes through the moving block through a threaded engagement. The synchronous rotation mechanism is disposed on the first mounting ring and is used to drive multiple threaded rods to rotate synchronously.

[0014] Based on the above scheme, the synchronous rotation mechanism includes an annular groove and a drive ring. The annular groove is formed on the outer wall of the first mounting ring. A second gear is rotatably arranged in the annular groove on one side of the threaded rod. The second gear is fixedly connected to the adjacent threaded rod. The drive ring is rotatably arranged in the annular groove. A second toothed ring is fixedly arranged on the inner wall of the drive ring. The second toothed ring meshes with the second gear.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a microbial limit detection filtration device, which has the following beneficial effects:

[0017] 1. In this utility model, by setting up a filtration mechanism, after the filter membrane is added into the mounting cover, the mounting cover can be inserted into the mounting groove. Then, the inlet pipe and the support pipe are installed and fixed by the mounting mechanism. At this time, the filter membrane can be fixed by pressing it against the inner bottom wall of the mounting cover by the sealing ring. At the same time, the filter membrane is supported by the bottom side wall of the mounting cover, thereby preventing the filter membrane from wrinkling or shifting position, and thus ensuring the filtration effect of the filter membrane.

[0018] 2. In this utility model, through the installation mechanism, the positioning seat can pass through the positioning port during the docking of the inlet pipe and the support pipe. Then, by rotating the drive ring, the second gear and the threaded rod can be driven to rotate through the meshing of the second toothed ring and the second gear on the drive ring. Then, the threaded rod and the moving block can be driven to move through the threaded engagement of the threaded rod and the moving block. Thus, the first gear can be driven to rotate through the meshing of the first gear and the first gear, and the positioning block can be moved. Finally, the installation and fixation of the inlet pipe and the support pipe can be achieved through the abutment of the positioning block and the second mounting ring. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this application;

[0020] Figure 2 This is a cross-sectional structural diagram of this application;

[0021] Figure 3 This is a structural schematic diagram of the support tube and inlet tube in their disassembled state according to this application;

[0022] Figure 4 This is a structural schematic diagram showing the disassembled cross-section of the support tube and the liquid inlet tube of this application.

[0023] Figure 5 This is a cross-sectional structural diagram of the positioning mechanism in this application;

[0024] Figure 6 For this application Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0025] In the diagram: 1. Box body; 2. Collection bucket; 3. Drain pipe; 4. Electric control valve; 5. Support pipe; 6. Inlet pipe; 7. Sealing cover; 8. Mounting groove; 9. Mounting cover; 10. Drain hole; 11. Filter membrane; 12. Sealing ring; 13. First mounting ring; 14. Second mounting ring; 15. Positioning port; 16. Positioning seat; 17. First gear; 18. Positioning block; 19. Moving block; 20. Threaded rod; 21. Second gear; 22. Drive ring. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-6 A microbial limit detection filtration device includes a housing 1, a vacuum pump installed on the housing 1 and connected to the housing 1, a collection bucket 2, a support tube 5, an inlet pipe 6, an installation mechanism, and a filtration mechanism. Multiple collection buckets 2 are fixedly installed inside the housing 1. A drain pipe 3 is connected to the side wall of each collection bucket 2, with one end of the drain pipe 3 extending out of the housing 1 away from the collection bucket 2. An electric control valve 4 is installed on the drain pipe 3. A support tube 5 is fixedly installed through the top side wall of the housing 1, located on the top side of the collection bucket 2. The inlet pipe 6 is located on the top side wall of the support tube 5, and a sealing cover 7 is threaded onto the top of the inlet pipe 6. The installation mechanism is located between the inlet pipe 6 and the support tube 5 for installing and fixing the inlet pipe 6 and the support tube 5. The filtration mechanism is located between the inlet pipe 6 and the support tube 5 for filtering liquid samples.

[0028] Reference Figures 1-5 The filtration mechanism includes a mounting groove 8, a mounting cover 9, a filter membrane 11, and a sealing ring 12. The mounting groove 8 is located at the top of the inner wall of the support tube 5. The mounting cover 9 is slidably disposed within the mounting groove 8. Multiple drainage holes 10 are provided on the bottom sidewall of the mounting cover 9. The filter membrane 11 is disposed within the mounting cover 9, and its shape is adapted to the inner wall of the mounting groove 8. The sealing ring 12 is fixedly disposed on the sidewall of the inlet pipe 6. The cross-section of the sealing ring 12 is L-shaped, and its bottom sidewall abuts against the filter membrane 11. A sealing ring is fixedly provided on the side wall. Specifically, after the filter membrane 11 is added into the mounting cover 9, the mounting cover 9 can be inserted into the mounting groove 8. Then, the inlet pipe 6 and the support pipe 5 are installed and fixed by the mounting mechanism. At this time, the filter membrane 11 can be pressed against the inner bottom wall of the mounting cover 9 by the sealing ring 12 to fix the filter membrane 11. At the same time, the bottom side wall of the mounting cover 9 supports the filter membrane 11, thereby preventing the filter membrane 11 from wrinkling or shifting position, thus ensuring the filtration effect of the filter membrane 11.

[0029] Reference Figures 4-6The installation mechanism includes a first mounting ring 13, a second mounting ring 14, a positioning seat 16, and a positioning mechanism. The first mounting ring 13 is fixedly mounted on the outer wall of the support pipe 5, and the second mounting ring 14 is fixedly mounted on the bottom side wall of the inlet pipe 6. The second mounting ring 14 has multiple positioning ports 15. A positioning seat 16 is fixedly mounted on one side of the positioning port 15 on the top side wall of the first mounting ring 13, and the positioning seat 16 passes through the positioning port 15. The positioning mechanism is mounted on the positioning seat 16 and is used to position the positioning seat 16 and the second mounting ring 14. The positioning mechanism includes a first cavity, a second... A gear 17, a movable block 19, a threaded rod 20, and a synchronous rotation mechanism are included. A first cavity is formed within a positioning seat 16. Limit openings are formed on two opposite sidewalls of the first cavity. The first gear 17 is rotatably positioned within the limit openings. A positioning block 18 is fixedly mounted on the sidewall of the first gear 17. The movable block 19 is slidably positioned within the first cavity. A first rack is fixedly mounted on the sidewall of the movable block 19 closest to the first gear 17, and the first rack meshes with the first gear 17. The threaded rod 20 is rotatably positioned within the first cavity and passes through the movable block 19 via a threaded engagement. A rotating mechanism is mounted on the first mounting ring 13 to drive multiple threaded rods 20 to rotate synchronously. The synchronous rotating mechanism includes an annular groove and a drive ring 22. The annular groove is formed on the outer wall of the first mounting ring 13. A second gear 21 is rotatably mounted inside the annular groove on one side of a threaded rod 20. The second gear 21 is fixedly connected to a nearby threaded rod 20. The drive ring 22 is rotatably mounted inside the annular groove. A second toothed ring is fixedly mounted on the inner wall of the drive ring 22, and the second toothed ring meshes with the second gear 21. Specifically, this allows for positioning during the docking of the inlet pipe 6 and the support pipe 5. The seat 16 passes through the positioning port 15. Then, by rotating the drive ring 22, the second gear 21 and the threaded rod 20 can be rotated through the meshing of the second toothed ring on the drive ring 22 with the second gear 21. Then, the threaded rod 20 and the moving block 19 can be moved through the threaded engagement of the threaded rod 20 with the moving block 19. Thus, the first gear 17 can be rotated through the meshing of the first rack with the first gear 17, and the positioning block 18 can be moved. Finally, the installation and fixation of the liquid inlet pipe 6 and the support pipe 5 can be achieved through the abutment of the positioning block 18 with the second mounting ring 14.

[0030] Working principle: During use, after adding the filter membrane 11 into the mounting cover 9, the operator can insert the mounting cover 9 into the mounting groove 8. Then, during the connection between the inlet pipe 6 and the support pipe 5, the positioning seat 16 passes through the positioning port 15. By rotating the drive ring 22, the second gear 21 and the threaded rod 20 are rotated through the meshing of the second gear ring on the drive ring 22. This, in turn, causes the moving block 19 and the first rack to move through the threaded engagement of the threaded rod 20 and the moving block 19. The first gear 17 is then rotated through the meshing of the first rack and the first gear 17, which in turn moves the positioning block 18. Finally, the positioning block 18 abuts against the second mounting ring 14, thus fixing the inlet pipe 6 and the support pipe 5 in place. After installation, the filter membrane 11 can be fixed by pressing it against the inner bottom wall of the mounting cover 9 through the sealing ring 12. At the same time, the bottom side wall of the mounting cover 9 supports the filter membrane 11, thereby preventing wrinkles or displacement of the filter membrane 11 and ensuring the filtration effect of the filter membrane 11. After the liquid to be tested is added to the inlet pipe 6, the sealing cover 7 is installed at the top of the inlet pipe 6 through threaded connection. At the same time, the operator controls the vacuum pump to work, so that the liquid to be tested can be filtered through the filter membrane 11. The filtered liquid can fall into the collection bucket 2 for collection. Then, the inlet pipe 6 can be separated from the support pipe 5 by rotating the drive ring 22, and the filter membrane 11 can be taken out using the mold remover. Then, the filter membrane 11 with intercepted microorganisms is transferred to the corresponding culture medium for culture. Finally, the microbial limit of the sample is determined by counting the number of colonies.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microbial limit detection filtration device, comprising a housing (1), wherein a vacuum pump is installed on the housing (1), the vacuum pump being connected to the housing (1), characterized in that, Also includes: Collection bucket (2), a plurality of collection buckets (2) are fixedly installed inside the box (1), a drain pipe (3) is connected to the side wall of the collection bucket (2), the end of the drain pipe (3) away from the collection bucket (2) extends out of the box (1), and an electric control valve (4) is installed on the drain pipe (3); The support tube (5) is fixedly installed on the top side wall of the box (1) through the top side of the collection bucket (2); The liquid inlet pipe (6) is disposed on the top side wall of the support pipe (5), and a sealing cover (7) is installed at the top end of the liquid inlet pipe (6) by means of threaded connection; The installation mechanism is disposed between the liquid inlet pipe (6) and the support pipe (5) for installing and fixing the liquid inlet pipe (6) and the support pipe (5); A filtration mechanism is disposed between the liquid inlet pipe (6) and the support pipe (5) for filtering liquid samples.

2. The microbial limit detection filtration device according to claim 1, characterized in that, The filtration mechanism includes: Mounting groove (8), which is formed at the top of the inner wall of the support tube (5); Mounting cover (9) is slidably disposed in the mounting groove (8), and the bottom side wall of the mounting cover (9) is provided with a plurality of drainage holes (10); A filter membrane (11) is disposed inside the mounting cover (9), and the filter membrane (11) is adapted to the shape of the inner wall of the mounting groove (8); A sealing ring (12) is fixedly disposed on the side wall of the liquid inlet pipe (6). The cross-section of the sealing ring (12) is L-shaped, and the bottom side wall of the sealing ring (12) abuts against the filter membrane (11).

3. The microbial limit detection filtration device according to claim 2, characterized in that, A sealing ring is fixedly provided on the bottom side wall of the sealing ring (12).

4. The microbial limit detection filtration device according to claim 3, characterized in that, The installation mechanism includes: The first mounting ring (13) is fixedly disposed on the outer wall of the support tube (5); The second mounting ring (14) is fixedly installed on the bottom side wall of the liquid inlet pipe (6), and the second mounting ring (14) has multiple positioning ports (15). The positioning seat (16) is fixedly provided on the top side wall of the first mounting ring (13) on one side of the positioning port (15), and the positioning seat (16) passes through the positioning port (15). A positioning mechanism is provided on the positioning seat (16) for positioning the positioning seat (16) and the second mounting ring (14).

5. The microbial limit detection filtration device according to claim 4, characterized in that, The positioning mechanism includes: The first cavity is formed inside the positioning seat (16), and the two opposite side walls of the first cavity are provided with limit openings. The first gear (17) is rotatably disposed in the limiting port, and a positioning block (18) is fixedly disposed on the side wall of the first gear (17). A movable block (19) is slidably disposed in the first cavity. A first rack is fixedly disposed on the side wall of the movable block (19) near the first gear (17). The first rack meshes with the first gear (17). A threaded rod (20) is rotatably disposed in the first cavity, and the threaded rod (20) passes through the movable block (19) through a threaded engagement; A synchronous rotation mechanism is provided on the first mounting ring (13) for driving the plurality of threaded rods (20) to rotate synchronously.

6. The microbial limit detection filtration device according to claim 5, characterized in that, The synchronous rotation mechanism includes: An annular groove is formed on the outer wall of the first mounting ring (13). A second gear (21) is rotatably arranged in the annular groove on one side of the threaded rod (20). The second gear (21) is fixedly connected to the adjacent threaded rod (20). A drive ring (22) is rotatably disposed in the annular groove. A second toothed ring is fixedly disposed on the inner wall of the drive ring (22), and the second toothed ring meshes with the second gear (21).

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