Sample negative-pressure filtering device with filter membrane convenient to replace

Abstract

The utility model discloses a sample negative pressure filter device convenient to replace a filter membrane, which comprises a main filter bottle, a first pipeline, a waste liquid bottle, a second pipeline, a vacuum pump, an impurity filter membrane, a sample filter membrane, a right-angle pipeline, an auxiliary filter bottle and a switch, and the main filter bottle, the first pipeline, the waste liquid bottle, the second pipeline and the vacuum pump are sequentially connected; an impurity filter membrane and a sample filter membrane are arranged at the bottom of the inner side of the main filter bottle at intervals, and the impurity filter membrane is positioned above the sample filter membrane; a right-angle pipeline is rotatably connected to the position, where the impurity filter membrane is placed, of the main filter bottle, the other end of the right-angle pipeline is connected with an auxiliary filter bottle, and a switch is arranged on the horizontal part of the right-angle pipeline. The utility model has the innovation points that the auxiliary filter bottle is rotatably connected to the main filter bottle, when the impurity filter membrane is blocked, a switch on the right-angle pipeline can be turned on to enable a solution in the main filter bottle to flow into the auxiliary filter bottle, and then after the impurity filter membrane is replaced by a new impurity filter membrane, the auxiliary filter bottle is rotated by 180 degrees to enable the solution in the auxiliary filter bottle to flow back.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory filtration, in particular to a sample negative pressure filtration device which is convenient for replacing filter membranes. Background Art

[0002] In the laboratory, a filtration device is usually used to filter the sample solution to obtain the required filter membrane carrying the sample. Usually, the solution in the filter bottle is filtered into the waste liquid bottle by negative pressure. However, when the filter membrane is blocked and needs to be replaced, the solution in the filter bottle must be poured out and replaced and then poured back. The operation steps are cumbersome and take more time. At the same time, there may be a risk of contamination during the process of pouring out and pouring back the solution, resulting in inaccurate test results, especially outdoors. Therefore, for the operation of filtering sample solutions, it is necessary to design a filtration device that is convenient for replacing filter membranes and does not require transferring solutions. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model invents a sample negative pressure filtering device which is convenient for replacing filter membranes.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A sample negative pressure filtering device which is convenient for replacing filter membranes, comprises a main filter bottle, a first pipe, a waste liquid bottle, a second pipe and a vacuum pump, wherein the first pipe is connected to the bottom of the main filter bottle, the other end of the first pipe is connected to the top of the waste liquid bottle, one end of the second pipe is connected to the top of the waste liquid bottle, and the other end of the second pipe is connected to the vacuum pump; it also comprises an impurity filter membrane, a sample filter membrane, a right-angle pipe, an auxiliary filter bottle and a switch, an impurity filter membrane and a sample filter membrane are placed at intervals at the bottom of the inner side of the main filter bottle, and the impurity filter membrane is located above the sample filter membrane; a right-angle pipe is rotatably connected to the position where the impurity filter membrane is placed in the main filter bottle, the other end of the right-angle pipe is connected to the auxiliary filter bottle, and a switch is provided on the horizontal portion of the right-angle pipe.

[0006] The innovation of the utility model is that a secondary filter bottle is rotatably connected to the main filter bottle. When the impurity filter membrane is blocked, the switch on the right-angle pipe can be opened to allow the solution in the main filter bottle to flow into the secondary filter bottle. Then, after replacing a new impurity filter membrane, the secondary filter bottle is rotated 180 degrees to allow the solution in the secondary filter bottle to reflux.

[0007] Furthermore, the bottom of the main filter bottle is conical, and the conical bottom is more convenient for the solution in the main filter bottle to flow under negative pressure. The area of ​​the filter membrane used is also smaller, which is convenient for installation and saves costs.

[0008] Furthermore, the first pipe and the second pipe are hard plastic pipes, which will not be flattened under negative pressure, thus facilitating the flow of the solution.

[0009] Furthermore, it also includes a bracket. The main filter bottle is provided with a bracket for stabilizing the rotation and fixation of the right-angle pipeline. The existence of the bracket can facilitate the fixation of the auxiliary filter bottle when it is facing downward or upward.

[0010] Furthermore, the bracket is composed of a T-bar and a tube clip. The T-bar is transversely fixed to the main filter bottle. The T-bar is provided with a tube clip for clamping the right-angle pipe. A simple structure is used to fix the right-angle pipe after rotating 180 degrees, eliminating the need for manual stabilization.

[0011] The advantages of the utility model are: the technical scheme of the utility model is designed in a way that the main filter bottle and the auxiliary filter bottle are replaced with each other. Under negative pressure, the solution in the main filter bottle will flow to the waste liquid bottle. When the impurity filter membrane is blocked, it is only necessary to transfer the solution in the main filter bottle to the auxiliary filter bottle. After replacing the new impurity filter membrane and flipping the auxiliary filter bottle, the solution can flow back to the main filter bottle, thus achieving the effect of quickly replacing the filter membrane. In addition, during the process of replacing the filter membrane, the solution will only flow in the sample negative pressure filtration device, reducing the possibility of contamination by external environmental factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a sample negative pressure filtering device that is convenient for replacing filter membranes in the utility model;

[0013] Figure 2 It is a stereoscopic diagram of a main filter bottle and its connecting parts in a sample negative pressure filtration device that is convenient for replacing filter membranes in the utility model;

[0014] Figure 3 It is a top view of a main filter bottle in a sample negative pressure filtration device that is convenient for replacing filter membranes in the utility model;

[0015] Figure 4 yes Figure 3 Sectional view of AA. DETAILED DESCRIPTION

[0016] The utility model is described in detail below with reference to the accompanying drawings:

[0017] In the description of the present utility model, it should be noted that the directions or positional relationships indicated by "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore cannot be understood as a limitation on the present utility model.

[0018] like Figure 1-4 As shown, a sample negative pressure filtration device that is convenient for replacing filter membranes includes a main filter bottle 1, a first pipeline 2, a waste liquid bottle 3, a second pipeline 4, a vacuum pump 5, an impurity filter membrane 6, a sample filter membrane 7, a right-angle pipeline 8, a secondary filter bottle 9, a switch 10 and a bracket 11. The bottom of the main filter bottle 1 is conical, and the first pipeline 2 is connected to the bottom of the main filter bottle 1. The first pipeline 2 is threadedly connected to the bottom of the main filter bottle 1, which is convenient for disassembly and assembly. The other end of the first pipeline 2 is connected to the top of the waste liquid bottle 3, and one end of the second pipeline 4 is connected to the top of the waste liquid bottle 3. The top of the waste liquid bottle 3 is provided with a connection port with the first pipeline 2 and the second pipeline 4. The connection port adopts a sealed connection method to ensure the sealing inside the waste liquid bottle 3. The other end of the second pipeline 4 is connected to the vacuum pump 5. When the vacuum pump 5 is working, negative pressure will be generated in the waste liquid bottle 3. Under the negative pressure, the solution in the main filter bottle 1 will flow to the waste liquid bottle 3 to achieve the filtration of the solution.

[0019] At the bottom of the inner side of the main filter bottle 1, there are an impurity filter membrane 6 and a sample filter membrane 7, and the impurity filter membrane 6 is located above the sample filter membrane 7. The specific position is that the impurity filter membrane 6 and the sample filter membrane 7 are alternately arranged at the conical bottom of the main filter bottle 1, and two annular steps for placing the impurity filter membrane 6 and the sample filter membrane 7 are placed on the inner side of the conical bottom, which can be easily taken and placed with a clip; the impurity filter membrane 6 and the sample filter membrane 7 are both composed of a filter membrane and a mounting ring, and a filter membrane is arranged in the middle of the mounting ring, so that they can be conveniently placed on the annular steps; the pore size of the impurity filter membrane 6 is larger than that of the sample filter membrane 7, and the impurity filter membrane 6 is used to filter the impurities in the solution in the main filter bottle 1, and the sample filter membrane 7 is used to filter the required virus or bacteria sample in the solution. The position where the impurity filter membrane 6 is placed in the main filter bottle 1 can be rotatably connected with a right-angle pipe 8, and the main filter bottle 1 is provided with a pipe mouth connected to the right-angle pipe 8, and the two are connected by threads; the lowest point of the inner diameter of the pipe mouth is level with or slightly lower than the top surface of the impurity filter membrane 6 by 1.0 to 2.0 mm. The other end of the right-angle pipe 8 is connected to a secondary filter bottle 9, and a switch 10 is provided at the horizontal part of the right-angle pipe 8. When the impurity filter membrane 6 is blocked, the switch 10 can be turned on to allow the solution to flow to the secondary filter bottle 9. After the solution has flowed out, the blocked impurity filter membrane 6 is removed and replaced with a new one, and then the secondary filter bottle 9 is turned 180 degrees to allow the solution to flow back to the main filter bottle 1 for further filtration. The secondary filter bottle 9 has the same capacity as the main filter bottle 1, which is at least two-thirds of the capacity of the main filter bottle 1, ensuring that the solution in the main filter bottle 1 can be filled.

[0020] In order to ensure that the pipes will not be flattened during the negative pressure process to affect the flow of the solution, the first pipe 2, the second pipe 4 and the right-angle pipe 8 are hard plastic pipes and are transparent.

[0021] In order to facilitate the fixation of the right-angle pipe 8 after flipping, a bracket 11 for stabilizing the rotation and fixation of the right-angle pipe 8 is provided on the main filter bottle 1. The bracket 11 consists of a T-bar 111 and a tube clamp 112. The T-bar 111 is laterally fixed to the main filter bottle 1, and the T-bar 111 is provided with a tube clamp 112 for clamping the right-angle pipe 8.

[0022] In order to ensure that the solution between the main filter bottle 1 and the auxiliary filter bottle 9 flows out, the horizontal section of the right-angle pipe 8 is an inclined tube with an inclination of 5 to 10 degrees, so that there will be a height difference between the lowest liquid levels of the main filter bottle 1 and the auxiliary filter bottle 9 regardless of whether the auxiliary filter bottle 9 is facing downward or upward.

[0023] In the technical solution of this embodiment, the connection between the main filter bottle 1, the first pipe 2, the waste liquid bottle 3, the second pipe 4, the vacuum pump 5, the impurity filter membrane 6, the sample filter membrane 7, the right-angle pipe 8, and the auxiliary filter bottle 9 is detachable, which is convenient for disassembly and packaging, and also convenient for replacement when a component is damaged.

[0024] Although the specific embodiments of the present invention have been described and illustrated in detail above, it should be noted that various changes and modifications may be made to the above embodiments without departing from the spirit of the present invention and the scope of the appended claims.

Claims

1. A sample negative pressure filtration device that is convenient for replacing filter membranes, comprising a main filter bottle (1), a first pipe (2), a waste liquid bottle (3), a second pipe (4) and a vacuum pump (5), wherein the bottom of the main filter bottle (1) is connected to the first pipe (2), the other end of the first pipe (2) is connected to the top of the waste liquid bottle (3), one end of the second pipe (4) is connected to the top of the waste liquid bottle (3), and the other end of the second pipe (4) is connected to the vacuum pump (5); It is characterized in that It also comprises an impurity filter membrane (6), a sample filter membrane (7), a right-angle pipe (8), a secondary filter bottle (9) and a switch (10); the impurity filter membrane (6) and the sample filter membrane (7) are placed at intervals at the bottom of the inner side of the main filter bottle (1), and the impurity filter membrane (6) is located above the sample filter membrane (7); a right-angle pipe (8) is rotatably connected to the position where the impurity filter membrane (6) is placed on the main filter bottle (1), the other end of the right-angle pipe (8) is connected to the secondary filter bottle (9), and a switch (10) is provided on the horizontal part of the right-angle pipe (8).

2. A sample negative pressure filtration device that is easy to replace the filter membrane according to claim 1, characterized in that: The bottom of the main filtering bottle (1) is conical.

3. A sample negative pressure filtration device that is easy to replace the filter membrane according to claim 2, characterized in that: The first pipe (2) and the second pipe (4) are hard plastic pipes.

4. A sample negative pressure filtration device that is easy to replace the filter membrane according to claim 3, characterized in that: It also comprises a bracket (11), and the main filtering bottle (1) is provided with a bracket (11) for stabilizing the rotation and fixing of the right-angle pipeline (8).

5. A sample negative pressure filtration device that is easy to replace the filter membrane according to claim 4, characterized in that: The support (11) comprises a T-shaped rod (111) and a tube clamp (112); the T-shaped rod (111) is transversely fixed to the main filtering bottle (1); and the T-shaped rod (111) is provided with a tube clamp (112) for clamping the right-angle pipeline (8).

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