Vacuum filtering device

Abstract

The utility model relates to a vacuum filtering device which is used for degerming and filtering a cell culture solution and a biological product solution. The filtering cup comprises a cup cover, a filtering cup body, a filtering base, a suction assembly, a collecting bottle and the like. The filter element is installed in the filter seat hole, the air nozzle is connected with the filter seat, the handle is vertically downward and can perform suction filtration, the filter membrane is hot-welded to the cup body and is in buckling fit with the filter seat, the collecting bottle is connected with the filter seat, and the bottle cap is used for sealing the collecting bottle. The filter seat and the air nozzle are provided with a pressure relief structure, and after suction filtration is completed, an air nozzle handle rotates by 45 degrees to relieve pressure; the filter seat is in buckling fit with the air tap; the air tap is provided with a handle; the bottom of the cup body is an inclined surface for rapid liquid flowing; a convex column supporting structure is supported below the filter membrane and gradually varies in depth; and an air filter element is arranged at the filter seat connected with the air tap. According to the vacuum filter, the filtering efficiency can be improved, negative pressure can be quickly released, a filter membrane is prevented from being damaged, a drawn pipe can be prevented from being brought out, external pollution is avoided, and many problems of an existing vacuum filter in the filtering and pressure releasing process are effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of filtration equipment, and in particular relates to a vacuum filtration device suitable for sterilization filtration of cell culture medium and biological product solutions. Background Technology

[0002] Vacuum filters are widely used in laboratories for the sterilization and filtration of small-volume solutions such as cell culture media and biological products. Based on the principle of membrane filtration, they use a vacuum pump to generate negative pressure for filtration, and utilize microporous membranes to trap microorganisms in the sample solution. The downstream filtrate can be collected and used directly.

[0003] However, current vacuum filters on the market have many shortcomings. During the filtration process, the structural design supporting the filter membrane is unreasonable. If the membrane is densely arranged, it will affect the filtration speed. If the membrane is sparsely arranged, some sparse areas cannot effectively support the filter membrane during negative pressure filtration. As a result, the pore size of the filter membrane will continue to increase under continuous stretching, which will ultimately have an adverse effect on the retention of microorganisms.

[0004] Furthermore, existing techniques also have shortcomings in the depressurization process within the collection bottle after bacterial filtration. Common depressurization methods include directly removing the filter or slowly depressurizing by turning off the vacuum pump. Direct removal creates an instantaneous backpressure, which could potentially damage the filter membrane and lead to experimental failure. On the other hand, slowly depressurizing by turning off the vacuum pump results in an excessively slow depressurization rate, severely impacting the experimental progress.

[0005] In summary, existing vacuum filters need improvement in terms of filtration efficiency, filter membrane protection, and pressure relief operation. This invention aims to solve these problems and provide a vacuum filtration device with better performance. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by providing a vacuum filtration device. Its primary application is in laboratory environments, used for sterilizing and filtering specific biological solutions to meet the purity requirements of solutions in cell culture, biopharmaceutical preparation, and other related experiments or production processes. In this field, this invention, through unique structural design and technological innovation, aims to solve the problems of existing vacuum filters in terms of filtration efficiency, membrane protection, and pressure relief operation, improving the overall performance and ease of use of the filtration device, and providing a more efficient and reliable filtration solution for biological experiments and related industries.

[0007] To achieve the above-mentioned application objectives, the present invention adopts the following technical solution: a vacuum filtration device includes a cup lid, a filter cup body, a filter base, a suction assembly, and a collection bottle;

[0008] The suction component is connected to one side of the filter base, the filter membrane is fixed to the bottom of the filter cup, and a protruding support structure is provided below the filter membrane. After the filter cup is covered with the cup lid, it is snapped into the installation hole of the filter base, and the collection bottle is connected to the bottom of the filter base.

[0009] Furthermore, a pressure relief structure is provided between the filter base and the air nozzle of the suction assembly, so that pressure can be relieved by rotating the handle of the air nozzle at a certain angle after the filtration is completed.

[0010] Furthermore, the air valve handle is rotated 45° to release pressure.

[0011] Furthermore, the bottom of the filter cup is provided with an inclined surface, and the convex pillar support structure is provided on this inclined surface, with the top of each convex pillar of the convex pillar support structure located on the same plane. That is, the distribution depth of the convex pillars of the convex pillar support structure gradually increases from the periphery to the center, and the tops of all the convex pillars are located on the same plane.

[0012] Furthermore, the bottom of the filter cup is provided with a slope to allow the liquid to collect and flow towards the filter membrane.

[0013] Furthermore, the inclined planes surround the convex column support structure.

[0014] Furthermore, a step for installing the filter membrane is provided between the inclined surface and the convex column support structure.

[0015] Furthermore, an air filter element is provided at the connection point between the filter base and the air nozzle.

[0016] Furthermore, the filter cup and the filter base are engaged through a snap-fit ​​mechanism, and the filter base and the air nozzle are engaged through a snap-fit ​​mechanism.

[0017] Furthermore, the filter membrane is fixed to the filter cup body by a heat-sealing welding process.

[0018] Compared with the prior art, the present invention has the following significant advantages:

[0019] 1. Filtration performance

[0020] Accelerate filtration and reduce residue: The inclined bottom design allows liquid to flow down quickly, preventing liquid accumulation and effectively accelerating the filtration process and improving filtration efficiency.

[0021] Uniform support for the filter membrane ensures optimal filtration: The cylindrical protrusions support the filter membrane structure, with the protrusion height gradually increasing from the periphery to the center. This adapts to the liquid flow on the inclined surface of the cup bottom, ensuring uniform support of the filter membrane throughout the filtration process. This avoids the problem of filter membrane pore size enlargement caused by negative pressure filtration, ensuring stable microbial retention and guaranteeing filtration quality.

[0022] 2. Pressure relief operation

[0023] Safe and efficient pressure relief: The filter base and nozzle are designed with a unique pressure relief structure. The nozzle handle can be used for safe filtration with the flow path pointing vertically downwards. After filtration is complete, rotating the handle 45° will release the pressure. This method can quickly release the negative pressure in the collection bottle while effectively avoiding the back pressure caused by rapid pressure relief, which can damage the filter membrane. This reduces the risk of experimental failure and improves experimental efficiency.

[0024] 3. Ease of component connection and operation

[0025] Preventing accidental removal of the nozzle: The snap-fit ​​design between the filter seat and the nozzle effectively prevents the nozzle from being pulled out when removing the filtration hose, ensuring the stability of the device connection, reducing experimental interruptions or other problems caused by accidental detachment of components, and improving the overall reliability of the device.

[0026] Effortless and convenient operation: The air nozzle is designed with a handle, which makes it easier and more convenient for operators to complete the operation, whether it is installation, depressurization, or insertion and removal of the filter hose. This improves the user experience and reduces the possibility of operational errors, especially when operating for a long time or frequently.

[0027] 4. Filter membrane fixation and safety aspects

[0028] The filter membrane is firmly and reliably fixed to the cup body through a heat-sealing welding process, which effectively prevents the filter membrane from falling off during the filtration process. This avoids problems such as filtration failure or filtrate contamination caused by the filter membrane falling off, ensuring the stability and reliability of the filtration process. Users do not need to worry about the adverse effects caused by the filter membrane loosening.

[0029] 5. Prevention of external pollution

[0030] Effectively prevents contamination: The filter seat is equipped with an air filter element at the air nozzle connection. During the vacuum pump's negative pressure extraction or depressurization process, it can effectively block external contaminants from entering the device, ensuring that the entire filtration process is carried out in a relatively pure environment. This improves the accuracy and reliability of experimental results, which is especially crucial for filtration applications such as cell culture media and biological product solutions that require high purity. Attached Figure Description

[0031] Figure 1 This is an exploded view of this utility model;

[0032] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0033] Figure 3 This is a schematic diagram of the cylindrical protrusion of this utility model. Figure 1 ;

[0034] Figure 4 This is a schematic diagram of the cylindrical protrusion of this utility model. Figure 2 ;

[0035] Figure 5 This is a schematic diagram of the inclined plane of this utility model.

[0036] In the diagram: 1. Cup lid; 2. Filter cup body; 3. Filter membrane; 4. Filter element; 5. Air nozzle; 6. Filter base; 7. Collection bottle; 8. Bottle cap; 21. Protruding column support structure; 22. Inclined surface; 23. Cup body and filter base fastening; 24. Step; 26. Inclined surface; 51. Handle; 61. Pressure relief structure; 62. Filter base and air nozzle fastening. Detailed Implementation

[0037] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0038] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0039] Example 1

[0040] like Figure 1-5 As shown, a vacuum filtration device includes a cup lid 1, a filter cup body 2, a filter base 6, an air nozzle 5, a filter element 4, a collection bottle 7, and a bottle cap 8. The filter element 4 is tightly installed into the hole of the filter base 6. The air nozzle 5 is connected to the filter base 6 via a filter base mating air nozzle fastener 62. When the handle of the air nozzle 5 is vertically downward, it ensures smooth connection with the vacuum pump's filtration hose and stable filtration operation. The filter membrane 3 is firmly connected to the filter cup body 2 via a heat welding process. The filter cup body 2 achieves a precise engagement with the filter base 6 via a cup body mating filter base fastener 23. The collection bottle 7 is tightly connected to the filter base 6, and the bottle cap 8 is used to seal the collection bottle 7.

[0041] The filter base 6 and the air nozzle 5 are designed with a pressure relief structure 61. After filtration is completed, rotating the handle of the air nozzle 5 clockwise by 45° allows for quick and smooth pressure relief, preventing damage to the filter membrane due to improper pressure relief. The interlocking fit between the filter base 6 and the air nozzle 5 is tight, ensuring the air nozzle 5 remains stable and will not be accidentally pulled out during repeated insertion and removal of the filtration hose. The handle 51 of the air nozzle 5 allows the operator to easily apply force when installing the air nozzle 5 to the filter base 6, performing pressure relief operations, and inserting or removing the filtration hose, making operation convenient and labor-saving. The slope 22 at the bottom of the filter cup 2 is reasonably designed (e.g., Figure 3 As shown, inclined surfaces 22 are distributed around the convex pillar support structure 21. They can be multiple evenly spaced or in a ring shape. A step 24 is provided between the inclined surfaces 22 and the convex pillar support structure 21 (which facilitates the heat sealing of the filter membrane 3). When cell culture medium or biological product solution is poured in, the liquid can flow down the inclined surfaces quickly without forming liquid accumulation at the bottom of the cup, greatly improving the filtration speed. The convex pillar support structure 21 below the filter membrane 3 is evenly distributed, and the distribution depth of the convex pillars gradually increases from the periphery to the center. In fact, an inclined surface 26 is provided at the bottom outlet of the filter cup 2, on which a group of convex pillars (convex pillar support structure 21) is set. The top of each convex pillar is located on the same plane (the convex pillar can be a cylinder, square pillar, triangular pillar, etc., which is not limited here). There is a through hole in the center of the convex pillar group, which can continuously and stably support the filter membrane 3 during the filtration process, effectively preventing the pore size of the filter membrane 3 from becoming larger and ensuring the microbial retention effect. The air filter element installed at the air nozzle 5 connected to the filter base 6 effectively blocks external air impurities from entering the collection bottle 7 when the vacuum pump is working, ensuring that the filtration process is not contaminated by external sources.

[0042] Example 2

[0043] This embodiment is basically the same as the structure of Embodiment 1, except that the shape of the support structure 21 of the convex pillar support structure below the filter membrane 3 is changed. In this embodiment, the shape of the convex pillar of the convex pillar support structure 21 changes from a circle to an ellipse, but still maintains the characteristic of gradually increasing distribution depth from the periphery to the center, so as to adapt to the liquid flow structure of the inclined bottom of the cup, achieve uniform support for the filter membrane 3, and also achieve the effect of preventing the pore size of the filter membrane 3 from increasing during the filtration process, thus ensuring the stable performance of the filtration device.

[0044] Furthermore, the area formed by the convex pillar support structure 21 is not limited to the rectangle shown in the attached figure, but can also be a parallelogram, triangle, circle, or other structures.

[0045] Example 3

[0046] This embodiment improves upon the design of the nozzle 5 handle 51 based on embodiment 1. An anti-slip texture is added to the surface of the nozzle 5 handle 51, allowing operators to better grip the handle 51 during operations such as filtration, depressurization, and insertion / removal of the filtration hose. This further enhances the convenience and stability of operation. Especially when hands are wet or gloves are worn, the anti-slip texture effectively prevents the handle 51 from slipping, ensuring operational safety and accuracy, while not affecting the normal connection and operation between the nozzle 5, the filter base 6, and the filtration hose.

[0047] Example 4

[0048] The pressure relief structure 61 is a key component ensuring safe and efficient pressure relief in the vacuum filtration device. This pressure relief structure 61 is mainly integrated at the connection point between the filter base 6 and the air nozzle 5, and its specific design is as follows:

[0049] 1) Structural composition

[0050] Pressure relief channel: The filter seat 6 has a dedicated pressure relief channel inside. One end of the channel is connected to the internal space of the collection bottle 7, and the other end leads to a specific position of the air nozzle 5 (set according to actual needs).

[0051] Sealing Component: A sealing component is provided at the connection between the pressure relief channel and the air nozzle 5. The sealing component includes components such as a sealing ring. Under normal filtration conditions, the sealing component ensures that the pressure relief channel is sealed, preventing air leakage from affecting the filtration effect. The sealing ring is made of high-temperature and corrosion-resistant rubber material, possessing good elasticity and sealing performance, and can maintain an effective seal even after multiple filtration and pressure relief operations.

[0052] Rotary control mechanism: Reference Figure 2 The nozzle 5 handle 51 is connected to the nozzle 5 body via a rotation control mechanism. This mechanism includes a rotating shaft and a limiting structure. When the nozzle 5 handle 51 is vertically downward, the rotation control mechanism misaligns the internal channel of the nozzle 5 with the pressure relief channel of the filter base 6. At this time, the filtration process proceeds normally, and the vacuum pump creates a negative pressure environment in the collection bottle 7 through the nozzle 5 for filtration. When filtration is complete and pressure relief is needed, the nozzle 5 handle 51 is rotated 45° clockwise. The rotation control mechanism drives the internal channel of the nozzle 5 to rotate, aligning it with the pressure relief channel of the filter base 6. This opens the pressure relief channel, allowing external air to enter the collection bottle 7 through the filter element 4, restoring the pressure in the collection bottle 7 to the same level as the pressure in the filter cup 2, thus achieving pressure relief. The filter element 4 prevents external air pollution from entering the device, ensuring that the pressure relief process does not contaminate the filtered liquid. The limiting structure ensures that the nozzle 5 handle 51 can only rotate within a specific angle range, preventing excessive rotation that could damage components or affect the normal function of the device.

[0053] 2) Working principle

[0054] Filtration stage: With the handle 51 of the air nozzle 5 pointing vertically downwards, the rotating control mechanism misaligns the internal channel of the air nozzle 5 with the pressure relief channel of the filter seat 6, maintaining a seal. The vacuum pump operates, drawing air from the collection bottle 7 through the air nozzle 5 to create a negative pressure environment. Under this negative pressure, the sample solution is filtered through the filter membrane 3, and the filtrate enters the collection bottle 7.

[0055] Pressure Relief Stage: After filtration is complete, rotate the handle 51° clockwise from nozzle 5 to 45°. The rotation control mechanism drives the internal channel of nozzle 5 to rotate, aligning it with the pressure relief channel of filter base 6. During rotation, the sealing assembly releases the seal on the pressure relief channel. This allows external air to quickly pass through nozzle 5, the pressure relief channel, and then through filter element 4 into collection bottle 7, restoring the pressure inside collection bottle 7 to the same level as the pressure inside filter cup 2, achieving rapid pressure relief. Because the pressure relief process is carried out through a gradually opening channel, the back pressure generated by rapid pressure relief is avoided from damaging the filter membrane 3.

[0056] The parts of this utility model not described in detail are existing technologies, therefore, this utility model does not describe them in detail.

[0057] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0058] Although this document uses a considerable amount of technical terminology, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

[0059] This utility model is not limited to the above-described preferred embodiment. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made to their shape or structure, any technical solution that is the same as or similar to this utility model falls within the protection scope of this utility model.

Claims

1. A vacuum filtration apparatus, characterized by, It comprises a cup cover (1), a filter cup body (2), a filter seat (6), a suction assembly and a collection bottle (7). The suction assembly is connected with one side of the filter seat (6), the filter membrane (3) is fixed to the bottom of the filter cup body (2), and a convex column support structure (21) is arranged below the filter membrane (3), the filter cup body (2) is buckled in the mounting hole of the filter seat (6) after the cup cover (1) is covered on the filter cup body (2), and the collection bottle (7) is connected below the filter seat (6).

2. A vacuum filtration apparatus according to claim 1, wherein, The filter seat (6) is provided with a pressure relief structure (61) between the air nozzle (5) of the suction assembly, and the handle (51) of the air nozzle (5) can be rotated by a certain angle to release pressure after the filtration is completed.

3. A vacuum filtration apparatus according to claim 2, wherein, The handle of the air nozzle (5) is rotated by 45° to release pressure.

4. The vacuum filtration apparatus of claim 1, wherein, The bottom of the filter cup body (2) is provided with an inclined surface (26), the convex column support structure (21) is arranged on the inclined surface (26), and the top of each convex column of the convex column support structure (21) is located on the same plane.

5. The vacuum filtration apparatus of claim 1, wherein, The bottom of the filter cup body (2) is provided with an inclined surface (22) for realizing liquid collection and flowing to the filter membrane (3).

6. A vacuum filtration apparatus according to claim 5, wherein, The inclined surface (22) surrounds the convex column support structure (21).

7. A vacuum filtration apparatus according to claim 5, wherein, The inclined surface (22) and the convex column support structure (21) are provided with a step (24) for mounting the filter membrane (3).

8. The vacuum filtration apparatus of claim 1, wherein, The filter seat (6) is provided with an air filter core at the connection position of the air nozzle (5).

9. A vacuum filtration apparatus according to any one of claims 1 to 8, wherein The filter cup body (2) and the filter seat (6) are buckled and matched through the cup body matching filter seat buckle position (23), the filter seat (6) and the air nozzle (5) are buckled and matched through the filter seat matching air nozzle buckle position (62), and the filter seat (6) and the air nozzle (5) are buckled and matched.

10. A vacuum filtration apparatus according to any one of claims 1 to 7, wherein The filter membrane (3) is fixed on the filter cup body (2) through a heat sealing welding process.

Images