Vacuum filter cup

Abstract

The utility model discloses a vacuum filter cup. The vacuum filter cup comprises a filter cup, a connector, a receiving bottle and a suction filtration nozzle; the inner bottom of the filter cup is sunken downwards to form a filter membrane placing table for placing a filter membrane, the filter membrane placing table is square, the edge of the filter membrane placing table is used for being attached to the edge of the filter membrane, the middle of the filter membrane placing table is further sunken downwards to form a filtrate flow guide area, and the sunken depth of the filtrate flow guide area is increased from the edge to the center. A flow guide rib extending from the edge part to the center is arranged in the filtrate flow guide area, a filtrate hole is formed in the center of the filtrate flow guide area, and the filtrate hole extends downwards to form a filtrate outlet pipe. The effective filtering area of the filter membrane can be increased, and the filtering efficiency and the filtering flux are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum filtration, and in particular relates to a vacuum filtration cup. Background Art

[0002] In biological research and development laboratories, there are many experimental steps involved in the treatment of biological fluids. For example: sterile filtration of culture media, sterile filtration of buffer solutions, protective clarification filtration before sample concentration ultrafiltration, sterile filtration of final samples, etc. At present, the commonly used filtration methods are normal pressure filtration, pressure filtration, reduced pressure filtration and centrifugal filtration, among which reduced pressure filtration is the most common. Vacuum filtration devices are often used for reduced pressure filtration. Generally, commonly used vacuum filtration devices are mainly composed of a filter cup, a cup cover, a filter membrane, a filtrate receiving bottle and a connecting device. Its working principle is: using a vacuum pump to provide a pressure difference, forcing the filtrate to pass through the filter membrane, and solid particles, impurities, and bacteria are retained on the filter membrane, thereby achieving the purpose of separation.

[0003] In the operation of biological sterilization filtration experiments, the sterility and sterilization performance of the filtration device are crucial. The existing non-disposable vacuum filtration device needs to be sterilized at high temperature and high pressure before use, and the filter membrane needs to be assembled to the connecting device before each filtration. During the assembly process, the membrane is prone to displacement or the connecting device is not assembled in place, causing leakage during the filtration process and causing sterile filtration failure. The disposable pre-sterilized vacuum filtration device equipped with a sterilizing filter membrane can avoid the above situation, ensure sterilization and aseptic properties, and make the experimental operation simple, fast and convenient.

[0004] There are many kinds of disposable vacuum filtration devices currently available, all of which have the advantages of being simple and fast, so they are increasingly widely used. However, existing single vacuum filtration devices generally have problems such as small effective filtration area of ​​the filter membrane, low filtration efficiency, and low filtration flux. For example: Patent document with publication number CN201894879U discloses a disposable microporous membrane filter, including an upper cup that is open at the top, opened at the bottom and closed with a microporous filter membrane, and a receiving bottle located at the bottom thereof, wherein a connector having an air extraction hole is provided between the upper cup and the receiving bottle to connect the upper cup and the receiving bottle, and the receiving bottle is a polystyrene component. This patent improves the vacuum negative pressure resistance of the bottle body by changing the material of the receiving bottle, but does not improve the filtration structure, and there are still problems such as small effective filtration area of ​​the filter membrane, low filtration efficiency, and low filtration flux. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a vacuum filter cup, which can increase the effective filtration area of ​​the filter membrane and improve the filtration efficiency and filtration flux.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] The utility model discloses a vacuum filter cup, which comprises a filter cup, a connector, a receiving bottle and a filter nozzle;

[0008] The bottom of the filter cup is sunken downward to form a filter membrane placement platform for placing the filter membrane. The filter membrane placement platform is square. The edge of the filter membrane placement platform is used to fit the edge of the filter membrane. The middle of the filter membrane placement platform is further sunken downward to form a filtrate diversion area. The depth of the filtrate diversion area increases from the edge to the center. The filtrate diversion area is provided with diversion ribs extending from the edge to the center. A filtrate hole is opened in the center of the filtrate diversion area. The filtrate hole extends downward to form a filtrate outlet pipe.

[0009] The connector comprises an upper interface and a lower interface which are interconnected, wherein the upper interface outer sleeve is connected to the filtrate outlet pipe, and the lower interface outer sleeve is connected to the bottle mouth of the receiving bottle;

[0010] The suction filter nozzle is used to connect to the air extraction pipeline, and the suction filter nozzle is communicated with the connector.

[0011] As a preferred technical solution, the guide ribs are arranged at long and short intervals in the filtrate guide area.

[0012] As a preferred technical solution, the filtrate diversion area is further provided with reinforcing support ribs spanning the filtrate diversion area.

[0013] As a preferred technical solution, a drainage rod is provided at the center of the filtrate outlet pipe.

[0014] As a preferred technical solution, the upper interface is clamped with the filtrate outlet pipe, and the lower interface is threadedly connected with the bottle mouth of the receiving bottle.

[0015] As a preferred technical solution, the top opening of the filter cup is also covered with a cup cover.

[0016] As a preferred technical solution, the filter cup and the receiving bottle are respectively provided with volume scales.

[0017] As a preferred technical solution, the receiving bottle is provided with a recessed portion for easy hand holding.

[0018] The beneficial effects of the utility model are:

[0019] The utility model sets the filter membrane placement platform at the bottom of the filter cup into a square shape, which can increase the effective filtration area of ​​the filter membrane by more than 20% when the diameter of the filter cup remains unchanged. At the same time, the middle part of the filter membrane placement platform is further recessed downward to form a filtrate guide area, and guide ribs are arranged in the filtrate guide area, which can further improve the filtration efficiency and increase the filtration flux. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model provides the following drawings for explanation:

[0021] Figure 1 This is a schematic diagram of the structure of the vacuum filter cup of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the vacuum filter cup of the utility model (without the cup cover and filter membrane);

[0023] Figure 3 for Figure 2 Longitudinal section view of . DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0025] like Figures 1 to 3 A vacuum filter cup is shown, which comprises a filter cup 1, a connector 2, a receiving bottle 3 and a filter nozzle 4.

[0026] The top opening of the filter cup 1 is covered with a cup cover 5, and the bottom of the filter cup 1 is recessed downward to form a filter membrane placement platform 6 for placing the filter membrane. The filter membrane placement platform 6 is square, and the edge of the filter membrane placement platform 6 is used to fit the edge of the filter membrane. The middle of the filter membrane placement platform 6 is further recessed downward to form a filtrate diversion area 7. The depth of the filtrate diversion area 7 increases from the edge to the center. The filtrate diversion area 7 is provided with a diversion rib 8 extending from the edge to the center. The diversion rib 8 is arranged at long and short intervals in the filtrate diversion area 7. The filtrate diversion area 7 is also provided with a reinforcing support rib 9 spanning the filtrate diversion area 7. A filtrate hole 10 is opened in the center of the filtrate diversion area 7. The filtrate hole 10 extends downward to form a filtrate outlet pipe 11. The center of the filtrate outlet pipe 11 is provided with a drainage rod 12.

[0027] The connector 2 includes an upper interface 13 and a lower interface 14 which are connected to each other. The upper interface 13 is covered with and clamped on the filtrate outlet pipe 11, and the lower interface 14 is covered with and threadedly connected to the bottle mouth of the receiving bottle 3.

[0028] The suction filter nozzle 4 is used to connect to the air extraction pipeline, and the suction filter nozzle 4 is communicated with the connector 2.

[0029] The filter cup 1 and the receiving bottle 3 are respectively provided with volume scales for easy observation during the filtering process; the receiving bottle 3 is provided with a recessed portion 15 for easy hand holding for easy grasping.

[0030] When in use, the filter nozzle 4 is connected to the vacuum pump through a hose, and then the liquid to be filtered is loaded into the cavity of the filter cup 1, the upper cup cover 5 is covered, and the vacuum pump is turned on. Then, the liquid in the filter cup 1 is subjected to the negative pressure, and after being filtered by the filter membrane, it flows into the filtrate diversion area 7, and finally flows into the receiving bottle 3 through the filtrate hole 10 and the filtrate outlet pipe 11. Since the filter membrane placement platform 6 is square, the effective filtration area of ​​the filter membrane can be increased by more than 20% when the diameter of the filter cup 1 remains unchanged. At the same time, the middle part of the filter membrane placement platform 6 is further recessed downward to form the filtrate diversion area 7, and the diversion ribs 8 are arranged in the filtrate diversion area 7, which can further improve the filtration efficiency and increase the filtration flux.

[0031] The flux of the vacuum filter cup of the utility model and a competitor product J were tested, and the test results are as follows:

[0032]

[0033] It can be seen from the above table that the filtration flux of the vacuum filter cup of the present invention is significantly increased compared with a certain competitor J.

[0034] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A vacuum filter cup, Features: The vacuum filter cup comprises a filter cup, a connector, a receiving bottle and a filter nozzle; The bottom of the filter cup is sunken downward to form a filter membrane placement platform for placing the filter membrane. The filter membrane placement platform is square. The edge of the filter membrane placement platform is used to fit the edge of the filter membrane. The middle of the filter membrane placement platform is further sunken downward to form a filtrate diversion area. The depth of the filtrate diversion area increases from the edge to the center. The filtrate diversion area is provided with diversion ribs extending from the edge to the center. A filtrate hole is opened in the center of the filtrate diversion area. The filtrate hole extends downward to form a filtrate outlet pipe. The connector comprises an upper interface and a lower interface which are interconnected, wherein the upper interface outer sleeve is connected to the filtrate outlet pipe, and the lower interface outer sleeve is connected to the bottle mouth of the receiving bottle; The suction filter nozzle is used to connect to the air extraction pipeline, and the suction filter nozzle is communicated with the connector.

2. The vacuum filter cup according to claim 1, Features: The guide ribs are arranged at long and short intervals in the filtrate guide area.

3. The vacuum filter cup according to claim 1, Features: The filtrate diversion area is also provided with reinforcing support ribs spanning the filtrate diversion area.

4. The vacuum filter cup according to claim 1, Features: A drainage rod is arranged at the center of the filtrate outlet pipe.

5. The vacuum filter cup according to claim 1, Features: The upper interface is clamped with the filtrate outlet pipe, and the lower interface is threadedly connected with the bottle mouth of the receiving bottle.

6. The vacuum filter cup according to claim 1, Features: The top opening of the filter cup is also covered with a cup cover.

7. The vacuum filter cup according to claim 1, Features: The filter cup and the receiving bottle are respectively provided with volume scales.

8. The vacuum filter cup according to claim 1, Features: The receiving bottle is provided with a recessed portion for easy hand holding.

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