A kind of baked food microbiological rapid detection film filter device

Abstract

The utility model relates to the technical field of microbiological detection, specifically relates to a baked food microbiological rapid detection thin film filter device, include: support subassembly, filter component and negative pressure subassembly, filter component includes filter cup, filter base and liquid collecting bottle, filter base is screwed in the bottom end of filter cup, and the middle part of filter base is opened to have filter chamber, and the inside of filter chamber is provided with filter membrane, and filter base is sealed with liquid collecting bottle intercommunication through the pipe, and the inside of filter cup is provided with pre -stirring device, and negative pressure subassembly includes negative pressure pump and buffer tank, and the communication between negative pressure pump and buffer tank, and buffer tank is sealed with liquid collecting bottle intercommunication through the air pipe, through setting up pre -stirring device in filter cup inside, can be before filtering to the baked food sample liquid and carry out sufficient stirring, make sample mixture even, effectively prevent the problem that filter membrane partial blockage is caused because solid particle distribution is uneven, significantly promote the filtration speed, shorten the detection time.

Description

Technical Field

[0001] This utility model relates to the field of microbial detection technology, specifically to a membrane filtration device for rapid microbial detection of baked goods. Background Technology

[0002] Baked goods are susceptible to microbial contamination during production and storage. Excessive microbial content can affect food safety, so microbial testing is necessary. Membrane filtration is a commonly used method for microbial testing. Its principle is to trap microorganisms in the sample through a filter membrane and then culture and count them.

[0003] Existing membrane filtration devices have the following problems when used for testing baked goods: on the one hand, the sample liquid of baked goods is prone to local blockage of the filter membrane due to uneven stirring, resulting in slow filtration speed; on the other hand, the filter membrane lacks an effective positioning structure, and is prone to displacement or wrinkling during filtration, affecting the accuracy of detection.

[0004] In addition, the filter assembly is cumbersome to disassemble and assemble, and the filter membrane is inconvenient to replace, which reduces the detection efficiency; the negative pressure system is directly connected to the collection bottle, and pressure fluctuations can easily cause the sample liquid to be drawn back, affecting the detection results. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a membrane filtration device for rapid detection of microorganisms in baked goods, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a membrane filtration device for rapid detection of microorganisms in baked goods, comprising: a support assembly, a filtration assembly, and a negative pressure assembly. The filtration assembly includes a filter cup, a filter base, and a collection bottle. The filter base is threaded to the bottom end of the filter cup, and a filtration chamber is formed in the middle of the filter base. A filter membrane is disposed inside the filtration chamber. The filter base is sealed and connected to the collection bottle through a conduit. A pre-stirring device is disposed inside the filter cup. The negative pressure assembly includes a negative pressure pump and a buffer tank. The negative pressure pump is connected to the buffer tank, and the buffer tank is sealed and connected to the collection bottle through a gas guide pipe.

[0007] Furthermore, the support assembly includes a base, a support frame is fixedly connected to the top of the base, the support frame is fixedly connected to the filter cup, and anti-slip pads are fixedly connected to the four corners of the bottom of the base.

[0008] Furthermore, the filter cup is made of transparent glass, and a liquid inlet is fixedly connected to one side of the top cover of the filter cup. A sealing plug is snapped into the top of the liquid inlet, and scale lines are provided on the side wall surface of the filter cup.

[0009] Furthermore, an annular step is provided at the inner edge of the filter chamber, and a sealing groove is provided at the top of the annular step. A sealing ring is engaged inside the sealing groove and is pressed against the edge of the filter membrane.

[0010] Furthermore, the filter membrane is made of mixed cellulose ester material, with a pore size of 0.45μm. The diameter of the filter membrane is adapted to the inner diameter of the filter chamber. The sealing ring is made of silicone material, with a circular cross-section that is adapted to the sealing groove.

[0011] Furthermore, the pre-stirring device includes a rotating shaft, several stirring rods are fixedly connected to the surface of the rotating shaft, the rotating shaft is rotatably connected to the top cover of the filter cup, and a knob is fixedly connected to the top of the rotating shaft.

[0012] Furthermore, a pressure gauge is fixedly connected to the top of the collection bottle, a pressure regulating valve is fixedly installed in the middle of the gas delivery tube, and a sealing cap is provided at the top of the collection bottle. The sealing cap has two interfaces that are respectively sealed and connected to the conduit and the gas delivery tube.

[0013] The technical solution provided by this utility model has the following advantages compared with the known prior art: 1. By installing a pre-stirring device inside the filter cup, the baked food sample liquid can be fully stirred before filtration, ensuring uniform mixing of the sample. This effectively prevents localized clogging of the filter membrane caused by uneven distribution of solid particles, significantly improving filtration speed and shortening detection time. 2. The filter chamber of the filter base is equipped with an annular step and a sealing groove, which, together with the silicone sealing ring, presses the edge of the filter membrane to keep the filter membrane flat and fixed during the filtration process, avoiding displacement or wrinkles, thereby ensuring the accuracy of microbial retention and the reliability of the test results. 3. A buffer tank is added to the negative pressure assembly and connected to the collection bottle through a gas guide tube. Combined with the real-time monitoring of the pressure regulating valve and pressure gauge, it can effectively buffer and stabilize negative pressure fluctuations, prevent sample liquid backflow, ensure a stable and controllable filtration process, and further improve detection accuracy. 4. The filter cup and filter base are connected by threads, making filter membrane replacement quick and convenient. The filter cup is made of transparent glass and has scale lines, making it easy to observe the sample liquid level and filtration progress. The overall structure is reasonably designed and easy to disassemble and assemble, which helps to improve detection efficiency and reduce operation complexity. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the support component structure of this utility model; Figure 3 This is a schematic diagram of the filter assembly structure of this utility model; Figure 4 This is a schematic diagram of the filter base structure of this utility model; Figure 5 This is a schematic diagram of the pre-stirring device of this utility model; Figure 6 This is a schematic diagram of the negative pressure component structure of this utility model.

[0016] The labels in the diagram represent: 1. Support assembly; 101. Base; 102. Support frame; 103. Anti-slip pad; 2. Filter assembly; 201. Filter cup; 2011. Liquid inlet; 2012. Sealing plug; 2013. Scale line; 202. Filter base; 2021. Annular step; 2022. Sealing groove; 2023. Filter membrane; 2024. Sealing ring; 203. Collection bottle; 2031. Pressure gauge; 2032. Guide tube; 3. Pre-stirring device; 301. Rotating shaft; 302. Stirring rod; 303. Knob; 4. Negative pressure assembly; 401. Negative pressure pump; 402. Buffer tank; 403. Air guide tube; 404. Pressure regulating valve. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] The present invention will be further described below with reference to the embodiments. Example 1:

[0019] Reference Figure 1-6This first embodiment of the present invention discloses a membrane filtration device for rapid detection of microorganisms in baked goods, comprising: a support assembly 1, a filtration assembly 2, and a negative pressure assembly 4. The filtration assembly 2 includes a filter cup 201, a filter base 202, and a collection bottle 203. The filter base 202 is threadedly connected to the bottom end of the filter cup 201. A filtration chamber is provided in the middle of the filter base 202, and a filter membrane 2023 is provided inside the filtration chamber. The filter base 202 is sealed and connected to the collection bottle 203 through a conduit 2032. A pre-stirring device 3 is provided inside the filter cup 201. The negative pressure assembly 4 includes a negative pressure pump 401 and a buffer tank 402. The negative pressure pump 401 is connected to the buffer tank 402, and the buffer tank 402 is sealed and connected to the collection bottle 203 through a gas guide pipe 403.

[0020] By setting a pre-stirring device 3 inside the filter cup 201, the sample liquid of baked food can be fully stirred before filtration, so that the sample is mixed evenly, effectively preventing the problem of local clogging of the filter membrane 2023 caused by uneven distribution of solid particles, significantly improving the filtration speed and shortening the detection time. Example 2:

[0021] Reference Figure 1-6 This is the second embodiment of the present invention, which differs from the first embodiment in that: The support assembly 1 includes a base 101, a support frame 102 is fixedly connected to the top of the base 101, the support frame 102 is fixedly connected to the filter cup 201, and anti-slip pads 103 are fixedly connected to the four corners of the bottom of the base 101. The filter cup 201 is made of transparent glass, and a liquid inlet 2011 is fixedly connected to one side of the top cover of the filter cup 201. A sealing plug 2012 is snapped into the top of the liquid inlet 2011, and scale lines 2013 are provided on the side wall surface of the filter cup 201.

[0022] The filter cup 201 and the filter base 202 are connected by threads, and the filter membrane 2023 can be replaced quickly and easily. The filter cup 201 is made of transparent glass and has scale lines 2013, which makes it easy to observe the sample liquid level and filtration progress. The overall structure is reasonably designed and easy to disassemble and assemble, which helps to improve detection efficiency and reduce operation complexity.

[0023] An annular step 2021 is provided at the inner edge of the filter chamber. A sealing groove 2022 is provided at the top of the annular step 2021. A sealing ring 2024 is engaged inside the sealing groove 2022. The sealing ring 2024 is pressed against the edge of the filter membrane 2023. The filter membrane 2023 is made of mixed cellulose ester material and has a pore size of 0.45μm. The diameter of the filter membrane 2023 is adapted to the inner diameter of the filter chamber. The sealing ring 2024 is made of silicone material and has a circular cross-section that is adapted to the sealing groove 2022.

[0024] The filter base 202 has an annular step 2021 and a sealing groove 2022 inside the filter chamber. Together with the silicone sealing ring 2024, it presses the edge of the filter membrane 2023, so that the filter membrane 2023 remains flat and fixed during the filtration process, avoiding displacement or wrinkles, thereby ensuring the accuracy of microbial retention and the reliability of the test results.

[0025] The pre-stirring device 3 includes a rotating shaft 301, with several stirring rods 302 fixedly connected to the surface of the rotating shaft 301. The rotating shaft 301 is rotatably connected to the top cover of the filter cup 201. A knob 303 is fixedly connected to the top of the rotating shaft 301. A pressure gauge 2031 is fixedly connected to the top of the collection bottle 203. A pressure regulating valve 404 is fixedly installed in the middle of the air guide pipe 403. A sealing cap is provided at the top of the collection bottle 203. The sealing cap has two interfaces that are respectively sealed and connected to the conduit 2032 and the air guide pipe 403.

[0026] A buffer tank 402 is added to the negative pressure assembly 4 and connected to the collection bottle 203 through the air guide pipe 403. Combined with the real-time monitoring of the pressure regulating valve 404 and the pressure gauge 2031, it can effectively buffer and stabilize negative pressure fluctuations, prevent sample liquid backflow, ensure a stable and controllable filtration process, and further improve detection accuracy.

[0027] The remaining structure is the same as that in Example 1.

[0028] The workflow of this utility model is as follows: First, unscrew the threaded connection between the filter cup 201 and the filter base 202. Place the filter membrane 2023 flat on the annular step 2021 inside the filter chamber of the filter base 202. Then, insert the sealing ring 2024 into the sealing groove 2022 and press the edge of the filter membrane 2023 to ensure a seal. Tighten the filter base 202 and the filter cup 201 again. Check if the sealing cap of the collection bottle 203 is tight. Ensure that the connection between the conduit 2032 and the gas conduit 403 is well sealed. Add the sample liquid of the baked food to be tested into the filter cup 201 through the liquid inlet 2011. Pay attention to the scale line 2013 to control the liquid volume. After adding the liquid, use the sealing plug 2012 to seal the liquid inlet 2011. Next, manually rotate the knob 303 at the top of the pre-stirring device 3, which drives the stirring rod 302 to rotate through the rotating shaft 301, and thoroughly stir the sample liquid in the filter cup 201 to make the solid particles evenly dispersed. After stirring, turn on the negative pressure component 4 and start the negative pressure pump 401. Vacuum the collection bottle 203 through the buffer tank 402 and the air guide tube 403. Observe the reading of the pressure gauge 2031 at the top of the collection bottle 203, and control the appropriate negative pressure value by adjusting the pressure regulating valve 404 in the middle of the air guide tube 403. Under the action of negative pressure, the sample liquid is filtered through the filter membrane 2023, and the microorganisms are trapped on the filter membrane 2023. The filtrate flows into the collection bottle 203 through the conduit 2032. Finally, after the sample solution in the filter cup 201 has been filtered, turn off the negative pressure pump 401, slowly open the pressure regulating valve 404 to release the system pressure, unscrew the filter base 202, carefully remove the filter membrane 2023 carrying microorganisms using sterile tweezers, transfer it to an appropriate culture medium for culture and counting, and clean the filter cup 201, filter base 202 and collection bottle 203 for future use.

[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A membrane filtration device for rapid detection of microorganisms in baked goods, characterized in that, include: The system includes a support assembly (1), a filter assembly (2), and a negative pressure assembly (4). The filter assembly (2) includes a filter cup (201), a filter base (202), and a collection bottle (203). The filter base (202) is threaded to the bottom of the filter cup (201). A filter chamber is provided in the middle of the filter base (202). A filter membrane (2023) is provided inside the filter chamber. The filter base (202) is sealed and connected to the collection bottle (203) through a conduit (2032). A pre-stirring device (3) is provided inside the filter cup (201). The negative pressure assembly (4) includes a negative pressure pump (401) and a buffer tank (402). The negative pressure pump (401) is connected to the buffer tank (402). The buffer tank (402) is sealed and connected to the collection bottle (203) through a gas guide pipe (403).

2. The membrane filtration device for rapid detection of microorganisms in baked goods according to claim 1, characterized in that, The support assembly (1) includes a base (101), a support frame (102) is fixedly connected to the top of the base (101), the support frame (102) is fixedly connected to the filter cup (201), and anti-slip pads (103) are fixedly connected to the four corners of the bottom of the base (101).

3. The membrane filtration device for rapid detection of microorganisms in baked goods according to claim 1, characterized in that, The filter cup (201) is made of transparent glass. A liquid inlet (2011) is fixedly connected to one side of the top cover of the filter cup (201). A sealing plug (2012) is snapped into the top of the liquid inlet (2011). The side wall surface of the filter cup (201) is provided with scale lines (2013).

4. The membrane filtration device for rapid detection of microorganisms in baked goods according to claim 1, characterized in that, An annular step (2021) is provided at the inner edge of the filter chamber. A sealing groove (2022) is provided at the top of the annular step (2021). A sealing ring (2024) is engaged inside the sealing groove (2022). The sealing ring (2024) is pressed against the edge of the filter membrane (2023).

5. A membrane filtration device for rapid detection of microorganisms in baked goods according to claim 4, characterized in that, The filter membrane (2023) is made of mixed cellulose ester material, the pore size of the filter membrane (2023) is 0.45μm, the diameter of the filter membrane (2023) is adapted to the inner diameter of the filter chamber, the sealing ring (2024) is made of silicone material, the cross-section of the sealing ring (2024) is circular and adapted to the sealing groove (2022).

6. A membrane filtration device for rapid detection of microorganisms in baked goods according to claim 1, characterized in that, The pre-stirring device (3) includes a rotating shaft (301), a plurality of stirring rods (302) are fixedly connected to the surface of the rotating shaft (301), the rotating shaft (301) is rotatably connected to the top cover of the filter cup (201), and a knob (303) is fixedly connected to the top of the rotating shaft (301).

7. A membrane filtration device for rapid detection of microorganisms in baked goods according to claim 1, characterized in that, A pressure gauge (2031) is fixedly connected to the top of the collection bottle (203), and a pressure regulating valve (404) is fixedly installed in the middle of the air guide tube (403). A sealing cap is provided at the top of the collection bottle (203), and the sealing cap has two interfaces that are respectively sealed and connected to the conduit (2032) and the air guide tube (403).

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