Multi-union suction filtration device capable of automatically adding liquid

Abstract

The utility model relates to the technical field of suction filtration equipment, in particular to a multi-union suction filtration device capable of automatically adding liquid, which comprises a funnel, a suction filtration bottle and a vacuum pump, a suction pipeline is arranged on the suction flask; the device further comprises a controller and a plurality of liquid adding pipelines provided with first liquid valves, and the liquid inlet ends of the liquid adding pipelines are all connected with pumping assemblies. And water level sensors are arranged in inner cavities of the funnels. According to the suction filtration device disclosed by the utility model, the defect that the sample preparation efficiency is relatively low due to the fact that an experimenter needs to observe the liquid level with naked eyes and needs to manually add a sample solution in a suction filtration device in the prior art is overcome; the sample solution is automatically pumped to each funnel according to the liquid level information, so that the liquid level of each funnel is stabilized at a specific liquid level, manpower can be saved, the sample preparation efficiency can be improved, the sample consistency can be ensured, and the accuracy of an experimental result can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of suction filtration equipment, and more specifically to a multi-connection suction filtration device capable of automatically adding liquid. Background Art

[0002] The filtration device is a commonly used device in biological sample experiments. Its main function is to accelerate the solid-liquid separation of samples by vacuum filtration. For example, when extracting a variety of fruit and vegetable cell wall polysaccharides, a large amount of ethanol can be added to multiple fruit and vegetable samples separately and continuously for filtration to remove free sugars in the fruit and vegetable tissues.

[0003] For example, a suction filtration device disclosed in the prior art includes a suction filtration bottle, a funnel and a rubber plug, wherein the rubber plug is placed at the mouth of the suction filtration bottle, a liquid flow channel is provided in the rubber plug, the funnel is located above the liquid flow channel, a liquid flow space is formed between the funnel and the rubber plug, a filtering device is provided in the funnel, a safety air release valve is installed on one side of the rubber plug, a suction filter nozzle is installed on the other side of the rubber plug, and one side of the suction filtration bottle is connected to a vacuum pump through a pipe. In this technical solution, the sample solution is suction filtered in the funnel, and finally the liquid in the sample flows into the suction filtration bottle through the sand core filter and the liquid flow space inside the funnel, while the solid components are retained in the funnel.

[0004] The liquid level of the funnel will have a certain impact on the filtration speed of the sample and the final amount of sample obtained. First, if the liquid level of the funnel is too high, the sample will not be filtered enough, and if the liquid level is too low, the sample will be over-filtered, resulting in sample loss, which will ultimately affect the repeatability of the experimental results. Therefore, when preparing multiple samples of the same organism, the experimenter needs to observe the liquid level of each funnel with the naked eye at all times, and manually pour the sample solution into the funnel in real time according to the liquid level of the funnel to ensure that the liquid level of each funnel is basically flat and as stable as possible to obtain a more consistent sample. However, this method is time-consuming and labor-intensive, the sample preparation efficiency is low, and it is difficult to ensure the consistency of the filtration process of each sample, resulting in the reference and accuracy of the experimental results are still low. Utility Model Content

[0005] In response to the problem in the above-mentioned prior art that the experimenter needs to observe the liquid level with the naked eye and manually add the sample solution, resulting in low sample preparation efficiency, the utility model provides a multi-filter device with automatic liquid addition, which can detect the liquid level of the funnel and automatically add the sample solution according to the liquid level of the funnel, thereby improving the sample preparation efficiency and sample consistency.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0007] A multi-connected suction filtration device capable of automatically adding liquid comprises a funnel, a suction filtration bottle and a vacuum pump, wherein the liquid outlet of the funnel is connected to the inner cavity of the suction filtration bottle, and a filtering structure for filtering the sample solution is arranged in the inner cavity of the funnel; an air suction pipe is arranged on the suction filtration bottle, and the vacuum pump is connected to the inner cavity of the suction filtration bottle through the air suction pipe; the device also comprises a controller and a plurality of liquid adding pipes provided with a first liquid valve, and the liquid inlet ends of the liquid adding pipes are all connected to a pumping assembly; a plurality of funnels are arranged, and the liquid adding pipes are connected to the liquid inlet of the funnel in a one-to-one correspondence, and a water level sensor is arranged in the inner cavity of the funnel; the pumping assembly, the first liquid valve and the water level sensor are all electrically connected to the controller.

[0008] Among them, the first liquid valve can be a butterfly valve, a ball valve, a regulating valve, a diaphragm valve or a proportional valve; the pumping component can be a single-channel liquid pump, or it can be a pumping component in a multi-channel liquid pump in the prior art, and each pumping component independently controls the liquid pumping of a liquid adding pipeline.

[0009] In the above technical scheme, the liquid inlet ends of all pumping components are first extended into the container containing the sample solution, and then the vacuum pump is manually or automatically turned on to extract the gas in the suction filtration bottle, so that the suction filtration bottle reaches a negative pressure state; the water level sensor detects the liquid level in the inner cavity of the funnel in real time and sends the liquid level information to the controller, and the controller compares the measured liquid level information with the previously set liquid level information to obtain the deviation, and controls the start and stop of the pumping component and the opening size of the first liquid valve according to the deviation; the sample solution flows into the liquid adding pipe under the pumping of the pumping component, and then flows into the inner cavity of the funnel and passes through the filtering structure; under the filtering of the filtering structure, the liquid and solid components in the sample solution are separated and flow into the suction filtration bottle, while the solid components are retained in the funnel. When it is necessary to stop filtering the sample solution, the pumping component, the first liquid valve and the vacuum pump can be manually or automatically closed. The above technical solution sets a water level sensor to detect the liquid level in the inner cavity of the funnel in real time, and then automatically pumps the sample solution to each funnel according to the liquid level information to stabilize the liquid level of each funnel at a specific liquid level. This not only saves manpower and improves the efficiency of sample preparation, but also ensures the consistency of the samples, which is conducive to improving the accuracy of the experimental results.

[0010] Preferably, the funnel is provided with a mounting structure detachably connected to the funnel, and the water level sensor is connected to the mounting structure. The water level sensor is detachably connected to the funnel through the mounting structure, so that the water level sensor can be easily removed from the funnel for cleaning, thereby preventing the sample solution from remaining on the outer surface of the water level sensor and causing contamination to the sample solution prepared subsequently. The mounting structure and the funnel can be connected by bonding, clamping, threading or by a connector.

[0011] Preferably, the water level sensor includes a connecting portion, a magnetoresistive component arranged on the connecting portion, a guide rod connected to the connecting portion, and a magnetic float connected to the guide rod in a vertical sliding direction, the magnetoresistive component is electrically connected to the controller; and the connecting portion is connected to the mounting structure. Such a water level sensor has the same working principle as the magnetic float level gauge in the prior art. The magnetic float slides up and down along the guide rod as the liquid level rises and falls. The magnetoresistive component measures the height of the liquid level by detecting the change in the magnetic field strength on the magnetic float, and then transmits the liquid level height information to the controller. The structure of the water level sensor is relatively simple, and it is relatively easy to install and maintain. In addition, it uses magnetoresistive resistors to detect slight changes in the position of the magnetic float, which can provide relatively accurate liquid level measurement.

[0012] Preferably, the mounting structure includes a main body, an extension portion is provided on the top of the main body, the extension portion extends in a radial direction of the funnel away from the center line of the funnel, the end of the extension portion (i.e., the end of the extension portion away from the main body) is connected to a first elastic clip, the extension portion abuts against the top edge of the funnel and the first elastic clip fits the outer wall of the funnel; the water level sensor is arranged on the main body. It can be understood that the first elastic clip and the extension portion form a hook structure hung on the top of the funnel, and the first elastic clip has a certain elasticity, which can apply a certain elastic force to the wall of the funnel to clamp the top edge of the funnel between the first elastic clip and the main body. Such a mounting structure is relatively simple and quick to disassemble and assemble on the funnel.

[0013] The water level sensor and the mounting structure may be connected in a manner of bonding, threaded connection, snap connection, clamping connection, magnetic attraction, or connection using a connector.

[0014] Preferably, the main body is provided with a second elastic clip and a third elastic clip, an angle is formed between the second elastic clip and the third elastic clip, the distance between the end of the second elastic clip and the end of the third elastic clip is smaller than the distance between the other ends of the two, it can be understood that the end of the second elastic clip is also the end of the second elastic clip away from the main body, and the end of the third elastic clip is also the end of the second elastic clip away from the main body; the connecting part is located between the second elastic clip and the third elastic clip and abuts against the end of the second elastic clip and the end of the third elastic clip at the same time. It can be understood that such a second elastic clip and the third elastic clip both have a certain elasticity, and the second elastic clip and the third elastic clip simultaneously apply elastic force to the connecting part so as to clamp the connecting part on the main body, so as to connect the water level sensor to the mounting structure. The water level sensor is detachably connected to the mounting structure, and the water level sensor can be removed from the mounting structure when necessary, which is convenient for the maintenance and replacement of the water level sensor. Moreover, such a mounting structure is relatively simple, easy to clean, and not easy to leave sample solution.

[0015] Preferably, the suction filtration bottle comprises a bottle body with a top opening and a sealing cover, wherein the sealing cover is detachably connected to the top opening of the bottle body and closes the top opening of the bottle body; the sealing cover is provided with a plurality of sockets corresponding to the funnels one by one, the neck of the funnel is inserted into the sockets, and the liquid outlet of the funnel is located in the inner cavity of the suction filtration bottle after passing through the sockets. The funnel can be quickly separated from the suction filtration bottle by pulling it off the socket, so that the sample in the funnel can be quickly collected. Removing the sealing cover from the bottle body can facilitate the cleaning of the inner cavity of the bottle body.

[0016] Preferably, a plurality of anti-skid convex patterns are provided on the portion where the neck of the funnel contacts the inner wall of the plug hole. Providing a plurality of anti-skid convex patterns can increase the roughness of the neck of the funnel, increase the friction between the neck of the funnel and the inner wall of the plug hole, and thus improve the stability of the neck of the funnel on the sealing cover. Of course, the anti-skid convex patterns can also be replaced with structures such as a silicone anti-skid layer and a multi-particle anti-skid layer.

[0017] Preferably, the bottom of the suction bottle is provided with a drain port connected to the inner cavity of the suction bottle, the drain port is connected to a drain pipe, the drain port is connected to the outside of the suction bottle through the drain pipe, and the drain pipe is provided with a second liquid valve. When the liquid level in the suction bottle reaches a certain height, the second liquid valve can be opened to discharge the liquid in the suction bottle through the drain pipe in time without disassembling the suction bottle. The second liquid valve can also be a butterfly valve, a ball valve, a regulating valve, a diaphragm valve or a proportional valve.

[0018] Preferably, a multi-channel peristaltic pump is also included, and a plurality of groups of the pumping components are provided on the multi-channel peristaltic pump. It is understandable that setting a multi-channel peristaltic pump to control the liquid pumping of different liquid adding pipes can save more device costs compared to setting multiple single-channel liquid pumps to control the liquid pumping of different liquid adding pipes. Moreover, the peristaltic pump will not pollute the sample solution during the process of pumping the sample solution. The pumping pressure of the sample solution can be adjusted by adjusting the rotation speed of the roller of the pumping component, thereby changing the delivery speed of the sample solution. The multi-channel peristaltic pump is a prior art, so its specific structure will not be described in detail.

[0019] Preferably, an air pressure sensor is provided on the air extraction pipeline, and the air pressure sensor is electrically connected to the controller; the vacuum pump is electrically connected to the controller. The air pressure sensor can detect the air pressure inside the air extraction pipeline, thereby obtaining the air pressure inside the suction filtration bottle. The controller controls the air extraction speed or start and stop of the vacuum pump according to the air pressure information measured by the air pressure sensor, so as to avoid the loss of sample due to the excessive filtration speed of the sample caused by the air pressure in the suction filtration bottle being too low.

[0020] Beneficial effects of the utility model:

[0021] (1) By setting a water level sensor to detect the liquid level in the funnel cavity in real time, the sample solution is automatically pumped into each funnel according to the liquid level information so that the liquid level of each funnel is stabilized at a specific liquid level. This can not only save manpower and improve the efficiency of sample preparation, but also ensure the consistency of the samples, which is conducive to improving the accuracy of the experimental results.

[0022] (2) The structure of the water level sensor is relatively simple, and it is easy to install and maintain. It uses a magnetoresistive component to detect small changes in the position of the magnetic float, and can provide relatively accurate liquid level measurement.

[0023] (3) The mounting structure is fixed on the funnel by the first elastic clip, and the water level sensor is clamped on the mounting structure by the second elastic clip and the third elastic clip. The mounting structure and the water level sensor can be assembled and disassembled easily and quickly, and both are easy to clean without residual sample solution.

[0024] (4) The filter bottle is provided with a drain port, which makes it more convenient to discharge the liquid in the filter bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a multi-connected suction filtration device capable of automatically adding liquid;

[0026] Figure 2 is a schematic diagram of the connection between the funnel and the mounting structure;

[0027] Figure 3 It is a structural diagram of the installation structure;

[0028] Figure 4 It is a schematic diagram of the structure of the water level sensor;

[0029] Figure 5 It is a connection diagram of the water level sensor and the mounting structure.

[0030] In the accompanying drawings: 1-funnel; 101-filter structure; 102-anti-slip convex pattern; 2-filter bottle; 201-bottle body; 2011-drain port; 202-sealing cover; 3-vacuum pump; 4-controller; 5-liquid adding pipeline; 6-multi-channel peristaltic pump; 601-pumping component; 602-switch; 603-liquid adding switch; 7-first liquid valve; 8-water level sensor; 801-connecting part; 802-magnetoresistive resistor component; 803-guide rod; 804-magnetic float; 9-installation structure; 901-main body; 902-extension part; 903-first elastic clip; 904-second elastic clip; 905-third elastic clip; 10-drainage pipeline; 11-second liquid valve; 12-air extraction pipeline; 13-air pressure sensor. DETAILED DESCRIPTION

[0031] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0034] Example 1

[0035] Combination Figure 1 and Figure 2A multi-connected suction filtration device capable of automatically adding liquid is shown, which includes four funnels 1, a suction filtration bottle 2 and a vacuum pump 3. The liquid outlet of the funnel 1 is connected to the inner cavity of the suction filtration bottle 2, and a filtering structure 101 for filtering the sample solution is provided in the inner cavity of the funnel 1. Further, an air extraction pipeline 12 is provided on the suction filtration bottle 2, and the vacuum pump 3 is connected to the inner cavity of the suction filtration bottle 2 through the air extraction pipeline 12. The device also includes a multi-channel peristaltic pump 6 (i.e., a four-channel peristaltic pump) provided with four groups of pumping components 601, a controller 4 and four liquid adding pipelines 5 each provided with a first liquid valve 7, and the liquid inlet end of the liquid adding pipeline 5 is connected to the pumping component 601 in a one-to-one correspondence; four funnels 1 are provided, and the liquid adding pipelines 5 are connected to the liquid inlet of the funnel 1 in a one-to-one correspondence, and a water level sensor 8 is provided in the inner cavity of the funnel 1; the pumping component 601, the first liquid valve 7 and the water level sensor 8 are all electrically connected to the controller 4.

[0036] Specifically, the controller 4 is arranged on the housing of the multi-channel peristaltic pump 6; the multi-channel peristaltic pump 6 is provided with a main switch 602 and four liquid adding switches 603, the main switch 602 is used to control the simultaneous start and stop of the four groups of pumping components 601 on the multi-channel peristaltic pump 6, and the four liquid adding switches 603 are respectively used to control the opening and closing of a single group of pumping components 601, so as to facilitate manual opening or closing of a single pumping component 601 in an emergency. The multi-channel peristaltic pump 6 is a prior art, so its specific structure is not described in detail.

[0037] Specifically, the filter structure 101 is a sand core, and the funnel 1 is a sand core funnel. Of course, the funnel 1 can also be a common funnel or a Buchner funnel according to actual needs.

[0038] The working principle or workflow of this embodiment is as follows: first, the liquid inlet ends of all pumping components 601 are extended into the container containing the sample solution, then the switch 602 is turned on, and the vacuum pump 3 is turned on manually or automatically to extract the gas in the suction bottle 2, so that the suction bottle 2 reaches a negative pressure state; the water level sensor 8 detects the liquid level in the inner cavity of the funnel 1 in real time and sends the liquid level information to the controller 4, the controller 4 compares the measured liquid level information with the previously set liquid level information to obtain the deviation, and controls the start and stop of the pumping component 601 and the speed of its roller according to the deviation, and controls the opening size of the first liquid valve 7; the sample solution flows into the liquid adding pipe 5 under the pumping of the pumping component 601, and then flows into the inner cavity of the funnel 1 and passes through the filtering structure 101; under the filtering of the filtering structure 101, the liquid and solid components in the sample solution are separated and flow into the suction bottle 2, while the solid components are retained in the funnel 1. When it is necessary to stop filtering the sample solution, the switch 602 can be manually turned off, and the vacuum pump 3 is turned off, so as to end the sample preparation.

[0039] The beneficial effects of this embodiment are as follows: by setting a water level sensor to detect the liquid level in the inner cavity of the funnel in real time, the sample solution is automatically pumped into each funnel according to the liquid level information, so that the liquid level of each funnel is stabilized at a specific liquid level. This can not only save manpower and improve the efficiency of sample preparation, but also ensure the consistency of the samples, which is conducive to improving the accuracy of the experimental results.

[0040] Example 2

[0041] This embodiment is based on the embodiment 1. Figures 1 to 5 As shown, the funnel 1 is provided with a mounting structure 9 detachably connected to the funnel 1, and the water level sensor 8 is connected to the mounting structure 9. The water level sensor 8 is detachably connected to the funnel 1 through the mounting structure 9, so that the water level sensor 8 can be easily removed from the funnel 1 for cleaning, thereby preventing the sample solution from remaining on the outer surface of the water level sensor 8 and causing contamination to the subsequently prepared sample solution.

[0042] Specifically, the water level sensor 8 includes a connecting portion 801, a magnetoresistive component 802 disposed on the connecting portion 801, a guide rod 803 connected to the connecting portion 801, and a magnetic float 804 slidably connected to the guide rod 803 along the vertical direction. The magnetoresistive component 802 is electrically connected to the controller 4, and a plurality of magnetoresistive components of the magnetoresistive component 802 are evenly distributed along the vertical direction; the connecting portion 801 is connected to the mounting structure 9. Such a water level sensor 8 has the same working principle as the magnetic float level gauge in the prior art. The magnetic float 804 slides up and down along the guide rod 803 as the liquid level rises and falls. The magnetoresistive component 802 measures the height of the liquid level by detecting the change in the magnetic field strength on the magnetic float 804, and then transmits the liquid level height information to the controller 4. The structure of the water level sensor 8 is relatively simple, and it is relatively convenient to install and maintain. Moreover, it uses magnetoresistive components to detect slight changes in the position of the magnetic float 804, and can provide relatively accurate liquid level measurement.

[0043] Further, the mounting structure 9 includes a main body 901, an extension part 902 is provided on the top of the main body 901, the extension part 902 extends in the radial direction of the funnel 1 in a direction away from the center line of the funnel 1, the end of the extension part 902 (i.e., the end of the extension part 902 away from the main body 901) is connected with a first elastic clip 903, the extension part 902 abuts against the top edge of the funnel 1 and the first elastic clip 903 fits the outer wall of the funnel 1; the water level sensor 8 is arranged on the main body 901. It can be understood that the first elastic clip 903 and the extension part 902 form a hook structure hung on the top of the funnel 1, and the first elastic clip 903 has a certain elasticity, which can apply a certain elastic force to the wall of the funnel 1 to clamp the top edge of the funnel 1 between the first elastic clip 903 and the main body 901. Such a mounting structure 9 is relatively simple and quick to disassemble and assemble on the funnel 1.

[0044] Further, the main body 901 is provided with a second elastic clip 904 and a third elastic clip 905, an angle is formed between the second elastic clip 904 and the third elastic clip 905, and the distance between the end of the second elastic clip 904 and the end of the third elastic clip 905 is smaller than the distance between the other ends. It can be understood that the end of the second elastic clip 904 is the end of the second elastic clip 904 away from the main body 901, and the end of the third elastic clip 905 is the end of the second elastic clip 904 away from the main body 901. The connecting portion 801 is located between the second elastic clip 904 and the third elastic clip 905 and abuts against the ends of the second elastic clip 904 and the third elastic clip 905 at the same time. It is understandable that such second elastic clip 904 and third elastic clip 905 both have a certain elasticity, and the second elastic clip 904 and third elastic clip 905 simultaneously apply elastic force to the connection part 801 so as to clamp the connection part 801 on the main body 901, so as to connect the water level sensor 8 with the mounting structure 9. The water level sensor 8 is detachably connected to the mounting structure 9, and the water level sensor 8 can be removed from the mounting structure 9 when necessary, which is convenient for the maintenance and replacement of the water level sensor 8. Moreover, such a mounting structure 9 is relatively simple, easy to clean, and not easy to leave residual sample solution.

[0045] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 1.

[0046] Example 3

[0047] This embodiment is based on the embodiment 2, combined with Figure 1 and Figure 2 As shown, the suction filtration bottle 2 includes a bottle body 201 with a top opening and a sealing cover 202. The sealing cover 202 is detachably connected to the top opening of the bottle body 201 and closes the top opening of the bottle body 201. The sealing cover 202 is provided with a plurality of sockets (not shown in the figure) corresponding to the funnel 1 one by one. The neck of the funnel 1 is inserted into the sockets, and the liquid outlet of the funnel 1 is located in the inner cavity of the suction filtration bottle 2 after passing through the sockets. The funnel 1 can be quickly separated from the suction filtration bottle 2 by pulling it off from the socket, so that the sample in the funnel 1 can be quickly collected. Removing the sealing cover 202 from the bottle body 201 can facilitate the cleaning of the inner cavity of the bottle body 201.

[0048] Furthermore, a plurality of anti-skid convex patterns 102 are provided on the portion where the neck of the funnel 1 contacts the inner wall of the insertion hole. The plurality of anti-skid convex patterns 102 can increase the roughness of the neck of the funnel 1, increase the friction between the neck of the funnel 1 and the inner wall of the insertion hole, and thus improve the stability of the neck of the funnel 1 on the sealing cover 202. Of course, the anti-skid convex patterns 102 can also be replaced with structures such as a silicone anti-skid layer and a multi-particle anti-skid layer.

[0049] Furthermore, a drain port 2011 communicating with the inner cavity of the suction bottle 2 is provided at the bottom of the suction bottle 2, a drain pipe 10 is connected to the drain port 2011, and the drain port 2011 is communicated to the outside of the suction bottle 2 through the drain pipe 10, and a second liquid valve 11 is provided on the drain pipe 10. When the liquid level in the suction bottle 2 reaches a certain height, the second liquid valve 11 can be opened to discharge the liquid in the suction bottle 2 in time through the drain pipe 10 without disassembling the suction bottle 2.

[0050] Furthermore, an air pressure sensor 13 is provided on the air extraction pipeline 12, and the air pressure sensor 13 is electrically connected to the controller 4; the vacuum pump 3 is electrically connected to the controller 4. The air pressure sensor 13 can detect the air pressure inside the air extraction pipeline 12, thereby obtaining the air pressure inside the suction filtration bottle 2. The controller 4 controls the air extraction speed or start and stop of the vacuum pump 3 according to the air pressure information measured by the air pressure sensor 13, so as to avoid the loss of the sample due to the excessive filtration speed of the sample caused by the air pressure in the suction filtration bottle 2 being too low.

[0051] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 2.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description, and it is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A multi-connected filtration device capable of automatically adding liquid, comprising a funnel (1), a filtration bottle (2) and a vacuum pump (3), wherein the liquid outlet of the funnel (1) is connected to the inner cavity of the filtration bottle (2), and a filtration structure (101) for filtering a sample solution is provided in the inner cavity of the funnel (1); an air extraction pipeline (12) is provided on the filtration bottle (2), and the vacuum pump (3) is connected to the inner cavity of the filtration bottle (2) through the air extraction pipeline (12); characterized in that: It also comprises a controller (4) and a plurality of liquid adding pipes (5) provided with a first liquid valve (7), wherein the liquid inlet ends of the liquid adding pipes (5) are connected to a pumping assembly (601); the funnel (1) is provided with a plurality of liquid adding pipes (5) which are connected to the liquid inlets of the funnel (1) in a one-to-one correspondence, and a water level sensor (8) is provided in the inner cavity of the funnel (1); the pumping assembly (601), the first liquid valve (7) and the water level sensor (8) are all electrically connected to the controller (4).

2. A multi-connected suction filtration device capable of automatically adding liquid according to claim 1, characterized in that: The funnel (1) is provided with a mounting structure (9) which is detachably connected to the funnel (1), and the water level sensor (8) is connected to the mounting structure (9).

3. A multi-connected suction filtration device capable of automatically adding liquid according to claim 2, characterized in that: The water level sensor (8) comprises a connecting portion (801), a magnetoresistive resistor component (802) arranged on the connecting portion (801), a guide rod (803) connected to the connecting portion (801), and a magnetic float (804) slidably connected to the guide rod (803) along a vertical direction, the magnetoresistive resistor component (802) being electrically connected to the controller (4); and the connecting portion (801) being connected to the mounting structure (9).

4. A multi-connected suction filtration device capable of automatically adding liquid according to claim 3, characterized in that: The mounting structure (9) comprises a main body (901), an extension portion (902) is provided at the top of the main body (901), the extension portion (902) extends along the radial direction of the funnel (1) in a direction away from the center line of the funnel (1), the end of the extension portion (902) is connected to a first elastic clip (903), the extension portion (902) abuts against the top edge of the funnel (1) and the first elastic clip (903) fits against the outer wall of the funnel (1); the water level sensor (8) is arranged on the main body (901).

5. A multi-connected suction filtration device capable of automatically adding liquid according to claim 4, characterized in that: The main body (901) is provided with a second elastic clip (904) and a third elastic clip (905), an angle is formed between the second elastic clip (904) and the third elastic clip (905), the distance between the end of the second elastic clip (904) and the end of the third elastic clip (905) is smaller than the distance between the other ends of the two, and the connecting portion (801) is located between the second elastic clip (904) and the third elastic clip (905) and is simultaneously in contact with the end of the second elastic clip (904) and the end of the third elastic clip (905).

6. The multi-connected suction filtration device capable of automatically adding liquid according to claim 1, characterized in that: The suction filtration bottle (2) comprises a bottle body (201) provided with a top opening and a sealing cover (202); the sealing cover (202) is detachably connected to the top opening of the bottle body (201) and seals the top opening of the bottle body (201); the sealing cover (202) is provided with a plurality of insertion holes corresponding to the funnel (1) one by one; the neck of the funnel (1) is inserted into the insertion holes; and the liquid outlet of the funnel (1) is located in the inner cavity of the suction filtration bottle (2) after passing through the insertion holes.

7. A multi-connected suction filtration device capable of automatically adding liquid according to claim 6, characterized in that: A plurality of anti-slip convex grooves (102) are provided on the portion where the neck of the funnel (1) contacts the inner wall of the insertion hole.

8. The multi-connected suction filtration device capable of automatically adding liquid according to claim 1, characterized in that: The bottom of the suction filtration bottle (2) is provided with a liquid discharge port (2011) which is in communication with the inner cavity of the suction filtration bottle (2); the liquid discharge port (2011) is connected to a liquid discharge pipe (10); the liquid discharge port (2011) is in communication with the outside of the suction filtration bottle (2) through the liquid discharge pipe (10); and a second liquid valve (11) is provided on the liquid discharge pipe (10).

9. The multi-connected suction filtration device capable of automatically adding liquid according to claim 1, characterized in that: It also comprises a multi-channel peristaltic pump (6), on which a plurality of groups of the pumping components (601) are arranged.

10. A multi-connected suction filtration device capable of automatically adding liquid according to any one of claims 1 to 9, characterized in that: An air pressure sensor (13) is provided on the air extraction pipeline (12), and the air pressure sensor (13) is electrically connected to the controller (4); the vacuum pump (3) is electrically connected to the controller (4).

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