Filtering device

Abstract

The utility model provides a filtering device, and belongs to the technical field of measurement auxiliary equipment. The problem that an existing filtering device is inconvenient to operate when a filtering method is switched is solved. The filtering device comprises a filtering funnel and a liquid receiving bottle, the lower end of the filtering funnel can be inserted into the upper end of the liquid receiving bottle and sealed, the upper end of the liquid receiving bottle is connected with a vacuum pump through an air outlet pipe, an exhaust pipe is further arranged at the upper end of the liquid receiving bottle, a first valve is connected to the exhaust pipe, and a second valve is connected to the air outlet pipe. In the process of switching the filtering method of the filtering device, the liquid receiving bottle does not need to be replaced, and only the first valve and the second valve need to be opened and closed, so that the operation of switching the filtering method of the filtering device is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement auxiliary equipment and relates to a filtering device. Background Art

[0002] Filtration is an operation in which the liquid (or gas) in a suspension (or gas containing solid particles) passes through a medium under the action of a driving force or other external force, and the solid particles and other substances are retained by the filter medium, thereby separating the solids and other substances from the liquid (or gas).

[0003] There are two methods for liquid filtration, including natural filtration and vacuum filtration. The filtration device used in the natural filtration method includes a filter funnel and an open liquid receiving bottle, a filter paper is placed in the filter funnel, and the liquid receiving bottle is placed below the filter funnel. When in use, the liquid to be filtered is poured into the filter funnel, and the liquid is filtered by the filter paper under the action of gravity and then dripped into or flows into the liquid receiving bottle. The natural filtration method has the disadvantages of long filtration time, some special samples cannot be filtered, and the amount of liquid residue is large. The filtration device used in the vacuum filtration method includes a filter funnel and a closed liquid receiving bottle, a filter paper is placed in the filter funnel, the lower end of the filter funnel is inserted into the liquid receiving bottle and sealed, and the upper end of the liquid receiving bottle is connected to a vacuum pump. When in use, the liquid to be filtered is poured into the filter funnel, and then the vacuum pump is turned on. The vacuum pump extracts the air in the liquid receiving bottle so that the air pressure of the liquid receiving bottle is less than the atmospheric pressure, and the liquid flows into the liquid receiving bottle after being filtered by the filter paper under the action of negative pressure. The vacuum filtration method has the advantages of fast filtration time and less liquid residue after filtration. However, during the filtration process, since the vacuum pump needs to work continuously, the vacuum filtration method has disadvantages such as high energy consumption.

[0004] In order to ensure the filtering effect while reducing energy consumption, the two filtering methods can be used in combination. Since the liquid receiving bottles in the two filtering methods are different, the liquid receiving bottle needs to be replaced during the filtration process. When replacing, the original open liquid receiving bottle is first removed, and then the closed liquid receiving bottle is connected to the filter funnel. Since there is still liquid and filtered solids remaining in the filter funnel, it is also necessary to reduce the shaking of the filter funnel during the operation to avoid pouring out the liquid and solids in the filter funnel, which makes the operation cumbersome and inconvenient. Utility Model Content

[0005] The purpose of the utility model is to propose a filtering device in view of the above problems existing in the prior art, and to solve the technical problem that the prior filtering device is inconvenient to operate when switching filtering methods.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A filtering device comprises a filter funnel and a liquid receiving bottle, wherein the lower end of the filter funnel can be inserted into the upper end of the liquid receiving bottle and sealed, and the upper end of the liquid receiving bottle is connected to a vacuum pump via an air outlet pipe. The device is characterized in that an exhaust pipe is also provided at the upper end of the liquid receiving bottle, a first valve is connected to the exhaust pipe, and a second valve is connected to the air outlet pipe.

[0008] When in use, first put filter paper in the filter funnel, then connect the filter funnel and the liquid receiving bottle, close the first valve and the second valve, then pour the liquid to be filtered into the filter funnel, then open the first valve to keep the liquid receiving bottle connected to the external environment, and use the natural filtration method, that is, the gravity of the liquid, to filter. After the liquid enters the liquid receiving bottle, the air in the liquid receiving bottle is discharged through the exhaust pipe; as the liquid in the filter funnel decreases, when the gravity of the liquid is less than the surface tension between the liquid and the filter funnel, the liquid no longer drips downward. At this time, close the first valve, open the second valve, and turn on the vacuum pump to switch to the vacuum filtration method. The air in the liquid receiving bottle is forced to be sucked out, and the liquid receiving bottle is in a negative pressure state. The liquid continues to drip into the liquid receiving bottle under the suction of the negative pressure until all the liquid in the filter funnel is filtered, and the second valve and the vacuum pump are closed. In the process of switching the filtering method of the filtering device, there is no need to replace the liquid receiving bottle, and only the first valve and the second valve need to be switched. Therefore, compared with the existing device that needs to replace the liquid receiving bottle, the operation of switching the filtering method of the filtering device is more convenient.

[0009] In the above-mentioned filtering device, the filtering device also includes a controller, a first sensor for monitoring whether there is liquid in the filtering funnel, and a second sensor for monitoring whether there is liquid dripping out from the lower end of the filtering funnel. The first valve and the second valve are both solenoid valves or electric valves. The first sensor, the second sensor, the first valve, the second valve and the vacuum pump are all electrically connected to the controller. The first sensor and the second sensor can respectively send a first sensing signal and a second sensing signal to the controller. The controller can receive the first sensing signal and the second sensing signal and can control the switch of the first valve, the switch of the second valve and the switch of the vacuum pump according to the received first sensing signal and the second sensing signal.

[0010] According to the working principles of the two filtering methods, after the liquid to be filtered is poured into the filter funnel, the first sensor detects that the filter funnel is filled with liquid, and sends a first sensing signal that the filter funnel is filled with liquid to the controller. After receiving the first sensing signal that the filter funnel is filled with liquid, the controller controls the first valve to open, and the liquid flows into or drips into the liquid receiving bottle under the action of gravity. The second sensor detects that liquid drips out of the lower end of the filter funnel, and sends a second sensing signal that liquid drips out of the lower end of the filter funnel to the controller. The controller controls the second valve and the vacuum pump to remain in a closed state according to the first sensing signal and the second sensing signal; when no liquid drips out of the lower end of the filter funnel, the second sensor detects that no liquid drips out of the lower end of the filter funnel, and the second sensor sends a second sensing signal that no liquid drips out of the lower end of the filter funnel to the controller. The controller controls the second valve and the vacuum pump to open according to the first sensing signal and the second sensing signal, and controls the first valve to close at the same time, and performs vacuum filtration until the first sensor detects that there is no liquid in the filter funnel, and the first sensor sends a first sensing signal that there is no liquid in the filter funnel to the controller, and the controller controls the second valve and the vacuum pump to close according to the first sensing signal. The controller, the first sensor and the second sensor can realize automatic switching between the two filtering modes, thereby reducing the workload of the experimenters.

[0011] In the above-mentioned filtering device, a drain pipe is provided at the lower end of the liquid receiving bottle, and a third valve is connected to the drain pipe. The drain pipe is used to discharge liquid, and the liquid in the liquid receiving bottle can be discharged from the drain pipe when the third valve is opened. When the eluent needs to be filtered out or there is a lot of liquid in the liquid receiving bottle, the liquid can be discharged through the drain pipe by controlling the third valve. When the eluent needs to be collected, a collecting bottle is connected to the drain pipe, and the liquid in the liquid receiving bottle is discharged and collected in the collecting bottle by the drain pipe. Avoid disassembling and assembling the liquid receiving bottle to pour out the liquid in the liquid receiving bottle during the filtration process. When the natural filtration method is adopted, the third valve can be opened at the same time as the first valve is opened, or the third valve can be opened after there is a certain amount of liquid in the liquid receiving bottle; when the vacuum filtration method is adopted, the third valve remains closed during the filtration process, and the third valve is opened to discharge the liquid after the vacuum pump stops working.

[0012] In the above-mentioned filtering device, the filtering device also includes a controller, a first sensor for monitoring whether there is liquid in the filtering funnel, a second sensor for monitoring whether there is liquid dripping from the lower end of the filtering funnel, and a third sensor for monitoring whether there is liquid at the lower end of the receiving bottle. The first valve, the second valve and the third valve are all solenoid valves or electric valves. The first sensor, the second sensor, the third sensor, the first valve, the second valve, the third valve and the vacuum pump are all electrically connected to the controller. The first sensor, the second sensor and the third sensor can respectively send a first sensing signal, a second sensing signal and a third sensing signal to the controller. The controller can receive the first sensing signal, the second sensing signal and the third sensing signal and can control the switch of the first valve, the switch of the second valve, the switch of the third valve and the switch of the vacuum pump according to the received first sensing signal, the second sensing signal and the third sensing signal.

[0013] According to the working principles of the two filtering methods, after the liquid to be filtered is poured into the filter funnel, the first sensor detects that the filter funnel is filled with liquid, and sends a first sensing signal that the filter funnel is filled with liquid to the controller. After receiving the first sensing signal that the filter funnel is filled with liquid, the controller controls the first valve to open, and the liquid flows into or drips into the liquid receiving bottle under the action of gravity. The third sensor detects that the lower end of the liquid receiving bottle is filled with liquid, and sends a third sensing signal that the lower end of the liquid receiving bottle is filled with liquid to the controller. After receiving the third sensing signal that the lower end of the liquid receiving bottle is filled with liquid, the controller controls the third valve to open, and the liquid in the liquid receiving bottle is discharged through the drain pipe. The second sensor detects that liquid drips out of the lower end of the filter funnel, and sends a second sensing signal that liquid drips out of the lower end of the filter funnel to the controller. The controller controls the second valve and the vacuum pump to remain in a closed state according to the first sensing signal and the second sensing signal. When no liquid drips out from the lower end of the filter funnel, the second sensor detects that no liquid drips out from the lower end of the filter funnel, and the second sensor sends a second sensing signal to the controller indicating that no liquid drips out from the lower end of the filter funnel. The controller controls the second valve and the vacuum pump to open according to the first sensing signal and the second sensing signal, and controls the first valve and the third valve to close at the same time, and performs vacuum filtration until the first sensor detects that there is no liquid in the filter funnel, and the first sensor sends a first sensing signal indicating that there is no liquid in the filter funnel to the controller, and the controller controls the second valve and the vacuum pump to close according to the first sensing signal; after the second valve and the vacuum pump are closed, if the third sensor detects that there is liquid at the lower end of the liquid receiving bottle, and sends a third sensing signal indicating that there is liquid at the lower end of the liquid receiving bottle to the controller, the controller controls the third valve to open after receiving the third sensing signal indicating that there is liquid at the lower end of the liquid receiving bottle, and the liquid in the liquid receiving bottle is discharged through the drain pipe. The controller, the first sensor, the second sensor, and the third sensor can realize the automatic switching of the two filtering modes and the automatic discharge of the filtered liquid, thereby reducing the workload of the experimenter.

[0014] In the above-mentioned filtering device, the filtering funnel is a sand core funnel. The sand core funnel has a sand core, and filter paper can be placed on the top of the sand core. The use of the sand core funnel adds a filter medium, which can improve the filtering effect.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] An exhaust pipe and an air outlet pipe are arranged in the liquid receiving bottle, the exhaust pipe is connected to a first valve, and the air outlet pipe is connected to a second valve and a vacuum pump, so that the switching operation of the two filtering modes is convenient. A controller, a first sensor, and a second sensor are arranged on the filtering device, so that the filtering mode can be automatically switched. A liquid discharge pipe is also arranged on the liquid receiving bottle, and a third valve is connected to the liquid discharge pipe, so that the filtered liquid can be discharged through the liquid discharge pipe. A third sensor is also arranged on the filtering device, so that automatic liquid discharge can be realized, which is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the first embodiment of the filtering device.

[0018] Figure 2 This is the electrical control principle diagram of the first embodiment of the filtering device.

[0019] Figure 3 It is a logic flow chart of working mode 1 in embodiment 1 of the filtering device.

[0020] Figure 4 It is a logic flow chart of working mode 2 in embodiment 1 of the filtering device.

[0021] In the figure, 1. filter funnel; 1a. filter paper; 1b. sand core; 2. liquid receiving bottle; 3. first valve; 4. second valve; 5. third valve; 6. vacuum pump; 7. first sensor; 8. second sensor; 9. third sensor; 10. air outlet pipe; 11. exhaust pipe; 12. drain pipe; 13. touch screen; 14. alarm; 15. controller. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] Embodiment 1

[0024] like Figure 1As shown, a filtering device comprises a filter funnel 1 and a liquid receiving bottle 2, wherein the lower end of the filter funnel 1 can be inserted into the upper end of the liquid receiving bottle 2 and sealed. A sealing plug is inserted at the bottle mouth of the upper end of the liquid receiving bottle 2, and the lower end of the filter funnel 1 can be inserted into the sealing plug and sealed. The upper end of the liquid receiving bottle 2 is connected to the vacuum pump 6 through the air outlet pipe 10, and the upper end of the liquid receiving bottle 2 is provided with an exhaust pipe 11, and the exhaust pipe 11 is connected to the first valve 3, and the air outlet pipe 10 is connected to the second valve 4. The lower end of the liquid receiving bottle 2 is provided with a drain pipe 12, and the drain pipe 12 is connected to the third valve 5. The liquid receiving bottle 2 has two structures, one of which is provided with the third valve 5 and the drain pipe 12, and can discharge liquid through the drain pipe 12, and the other is not provided with the third valve 5 and the drain pipe 12, and the liquid needs to be stored in the liquid receiving bottle 2. The filter funnel 1 can be a common funnel or a sand core funnel, in which a sand core 1b is provided, and filter paper 1a can be placed above the sand core 1b in the sand core funnel. The outlet end of the drain pipe 12 can also be connected to a liquid collecting bottle for collecting the discharged liquid.

[0025] like Figure 1 and Figure 2 As shown, the filtering device also includes a controller 15, a first sensor 7 for monitoring whether there is liquid in the filter funnel 1, a second sensor 8 for monitoring whether there is liquid dripping from the lower end of the filter funnel 1, and a third sensor 9 for monitoring whether there is liquid at the lower end of the liquid receiving bottle 2. The first valve 3, the second valve 4 and the third valve 5 are all solenoid valves or electric valves, and the first sensor 7, the second sensor 8, the third sensor 9, the first valve 3, the second valve 4, the third valve 5 and the vacuum pump 6 are all electrically connected to the controller 15. The first sensor 7, the second sensor 8 and the third sensor 9 can send a first sensing signal, a second sensing signal and a third sensing signal to the controller 15 respectively. The controller 15 can receive the first sensing signal, the second sensing signal and the third sensing signal and can control the switch of the first valve 3, the switch of the second valve 4, the switch of the third valve 5 and the switch of the vacuum pump 6 according to the received first sensing signal, the second sensing signal and the third sensing signal. The controller 15 can be a PLC controller or an MCU controller, and the first sensor 7, the second sensor 8 and the third sensor 9 can be a radar sensor, an infrared sensor, a laser sensor or an acoustic sensor.

[0026] Different working modes need to be selected according to the different structures of the liquid receiving bottle 2. When the liquid receiving bottle 2 with the third valve 5 and the liquid discharge pipe 12 is used, working mode 1 is selected. When the liquid receiving bottle 2 without the third valve 5 and the liquid discharge pipe 12 is used, working mode 2 is selected. The filtering device also includes a touch screen 13 and an alarm 14. The touch screen 13 and the alarm 14 are both electrically connected to the controller 15. The working mode signal can be input into the controller 15 through the touch screen 13. The working mode signal includes a signal of working mode 1 and a signal of working mode 2. The controller 15 can receive the working mode signal and can call the program of working mode 1 or the program of working mode 2 according to the working mode signal. The alarm 14 can be an alarm light or an alarm horn.

[0027] After starting up, the first valve 3, the second valve 4, the third valve 5 and the vacuum pump 6 are all reset to the closed state. The working mode 1 is selected through the touch screen 13, and the touch screen 13 inputs the working mode 1 signal to the controller 15. The controller 15 receives the working mode 1 signal and calls the working mode 1 program according to the working mode 1 signal. The logic flow chart of the working mode 1 program called by the controller 15 is as follows: Figure 3 As shown, after entering working mode 1, the filter device is in standby mode. The controller 15 receives the first sensing signal of the first sensor 7. When there is no liquid in the filter funnel 1, the filter device remains in standby mode; when there is liquid in the filter funnel 1, the first valve 3 is opened. Then the controller 15 receives the third sensing signal of the third sensor 9. When there is liquid at the lower end of the liquid receiving bottle 2, the third valve 5 is opened; when there is no liquid at the lower end of the liquid receiving bottle 2, the third valve 5 is closed. Then the controller 15 receives the second sensing signal of the second sensor 8. When liquid drips out from the lower end of the filter funnel 1, the program returns to the controller 15 receiving the first sensing signal of the first sensor 7. When there is no liquid dripping out of the lower end of the filter funnel 1, the first valve 3 is closed, the third valve 5 is closed, the second valve 4 and the vacuum pump 6 are opened, and then the controller 15 receives the first sensing signal of the first sensor 7. When there is liquid in the filter funnel 1, the controller 15 receives the second sensing signal of the second sensor 8. When there is no liquid in the filter funnel 1, the second valve 4 is closed and the vacuum pump 6 is closed, and then the controller 15 receives the third sensing signal of the third sensor 9. When there is liquid in the lower end of the liquid receiving bottle 2, the third valve 5 is opened. When there is no liquid in the lower end of the liquid receiving bottle 2, the third valve 5 is closed, and then the program returns to standby. When there is liquid in the filter funnel 1 and no liquid drips out of the lower end of the filter funnel 1, the second valve 4 and the vacuum pump 6 are closed, and the alarm 14 sends an alarm signal.

[0028] The working mode 2 is selected by the touch screen 13, and the touch screen 13 inputs the working mode 2 signal to the controller 15. The controller 15 receives the working mode 2 signal and calls the working mode 2 program according to the working mode 2 signal. The logic flow chart of the working mode 2 program called by the controller 15 is as follows: Figure 4 As shown, after entering the working mode 2, the filter device is in a standby state. The controller 15 receives the first sensing signal of the first sensor 7. When there is no liquid in the filter funnel 1, the filter device remains in a standby state; when there is liquid in the filter funnel 1, the first valve 3 is opened. Then the controller 15 receives the second sensing signal of the second sensor 8. When liquid drips out from the lower end of the filter funnel 1, the program returns to the controller 15 receiving the first sensing signal of the first sensor 7. When there is no liquid dripping out from the lower end of the filter funnel 1, the first valve 3 is closed, the third valve 5 is closed, the second valve 4 is opened, and the vacuum pump 6 is opened. Then the controller 15 receives the first sensing signal of the first sensor 7. When there is liquid in the filter funnel 1, the controller 15 receives the second sensing signal of the second sensor 8; when there is no liquid in the filter funnel 1, the second valve 4 and the vacuum pump 6 are closed; then the program returns to standby. When there is liquid in the filter funnel 1 and no liquid drips out from the lower end of the filter funnel 1, the second valve 4 and the vacuum pump 6 are closed, and the alarm 14 sends an alarm signal.

[0029] In the first application of the filtering device, the target object is left on the filter paper 1a, such as free silica. When starting to work, the first valve 3, the second valve 4, the third valve 5 and the vacuum pump 6 are all reset to the closed state after starting. The liquid receiving bottle 2 is selected to have a liquid discharge pipe 12 and a third valve 5, and the working mode is selected to be working mode 1. First, connect the filter funnel 1 equipped with filter paper 1a to the liquid receiving bottle 2, then select working mode 1 on the touch screen 13, and then pour the liquid to be filtered into the filter funnel 1. At this time, there is liquid in the filter funnel 1, the first valve 3 is opened, and filtration is started by natural filtration. During the filtration process, the third valve 5 is opened to discharge the liquid in the liquid receiving bottle 2. When there is no liquid dripping out of the lower end of the filter funnel 1, the first valve 3 is closed, the third valve 5 is closed, the second valve 4 and the vacuum pump 6 are opened, and filtration is performed by vacuum filtration. When there is no liquid in the filter funnel 1, the second valve 4 and the vacuum pump 6 are closed, and the third valve 5 is opened to discharge the liquid in the liquid receiving bottle 2. After there is no liquid in the liquid receiving bottle 2, the third valve 5 is closed to complete the filtration.

[0030] The second application of the filtering device is that the target object needs multiple elutions, such as the target object is a pigment. When starting to work, the first valve 3, the second valve 4, the third valve 5 and the vacuum pump 6 are all reset to the closed state after the machine is turned on. Filtration is performed first, and during filtration, the liquid receiving bottle 2 is selected to have a liquid discharge pipe 12 and a third valve 5, and the working mode is selected to be working mode 1. First, connect the filter funnel 1 equipped with filter paper 1a to the liquid receiving bottle 2, then select working mode 1 on the touch screen 13, and then pour the liquid to be filtered into the filter funnel 1. At this time, there is liquid in the filter funnel 1, the first valve 3 is opened, and filtration is started by natural filtration. During the filtration process, the third valve 5 is opened to discharge the liquid in the liquid receiving bottle 2. When there is no liquid dripping out of the lower end of the filter funnel 1, the first valve 3 is closed, the third valve 5 is closed, the second valve 4 and the vacuum pump 6 are opened, and filtration is performed by vacuum filtration. When there is no liquid in the filter funnel 1, the second valve 4 and the vacuum pump 6 are closed, and the third valve 5 is opened to discharge the liquid in the liquid receiving bottle 2. After there is no liquid in the liquid receiving bottle 2, the third valve 5 is closed to complete the filtration.

[0031] Then, elution is performed. During elution, the liquid receiving bottle 2 is selected to be the liquid receiving bottle 2 without the liquid discharge pipe 12 and the third valve 5, and the working mode is selected to be working mode 2. The liquid receiving bottle 2 for filtration is taken out, and then the liquid receiving bottle 2 for elution is connected to the filter funnel 1, and then working mode 2 is selected on the touch screen 13, and then the eluent is poured into the filter funnel 1. At this time, there is liquid in the filter funnel 1, the first valve 3 is opened, and filtration is started by natural filtration. When no liquid drips out from the lower end of the filter funnel 1, the first valve 3 is closed, the second valve 4 and the vacuum pump 6 are opened, and filtration is performed by vacuum filtration. When there is no liquid in the filter funnel 1, the second valve 4 and the vacuum pump 6 are closed, and elution is completed.

[0032] In addition, the operation of elution can also select working mode 1, that is, the liquid receiving bottle 2 during elution selects the liquid receiving bottle 2 with the liquid discharge pipe 12 and the third valve 5, and the working mode selects working mode 1. Continue to use the liquid receiving bottle 2 during filtration, and connect the liquid collecting bottle to the liquid discharge pipe 12 at the same time, and then select working mode 1 on the touch screen 13, and then pour the eluent into the filter funnel 1. At this time, there is liquid in the filter funnel 1, the first valve 3 is opened, and the filtration is started by natural filtration. During the filtration process, the third valve 5 is opened to discharge the liquid in the liquid receiving bottle 2 and collect it in the liquid collecting bottle. When there is no liquid dripping out from the lower end of the filter funnel 1, the first valve 3 is closed, the third valve 5 is closed, the second valve 4 and the vacuum pump 6 are opened, and the filtration is performed by vacuum filtration. When there is no liquid in the filter funnel 1, the second valve 4 and the vacuum pump 6 are closed, and the third valve 5 is opened to discharge the liquid in the liquid receiving bottle 2 and collect it in the liquid collecting bottle. When there is no liquid in the liquid receiving bottle 2, the third valve 5 is closed to complete the elution.

[0033] This filtration device can automatically discharge waste liquid, automatically identify whether vacuum filtration is needed, and automatically switch between two filtration methods. It is suitable for filtering and eluting various solutions. The whole process is automated, saving time and manpower, reducing the workload of experimenters, and improving detection efficiency. It avoids manual operation errors and improves the consistency of detection results. Waste liquid is automatically collected to protect the environment and ensure the safety of experimenters.

[0034] Embodiment 2

[0035] Compared with the first embodiment, this embodiment does not have an electric control part, that is, it does not have a controller 15, a first sensor 7, a second sensor 8, and a third sensor 9. The first valve 3, the second valve 4, and the third valve 5 are all manual valves. The filtering device of the second embodiment is used for manually operating the filtering process and the elution process.

[0036] Embodiment 3

[0037] The structure is simplified on the basis of the first embodiment, wherein the third sensor 9 is omitted, and the liquid receiving bottle 2 can also have two structures, one of which is provided with a liquid discharge pipe 12 and a third valve 5, and the third valve 5 is a manual valve, and the other is not provided with a liquid discharge pipe 12 and the third valve 5. The program on the controller 15 is the working mode 2 in the first embodiment, that is, Figure 4 As shown, other structures are the same as those in the first embodiment.

[0038] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A filtering device, comprising a filtering funnel (1) and a liquid receiving bottle (2), wherein the lower end of the filtering funnel (1) can be inserted into the upper end of the liquid receiving bottle (2) and sealed, and the upper end of the liquid receiving bottle (2) is connected to a vacuum pump (6) via an air outlet pipe (10), characterized in that: An exhaust pipe (11) is also provided at the upper end of the liquid receiving bottle (2), a first valve (3) is connected to the exhaust pipe (11), and a second valve (4) is connected to the exhaust pipe (10).

2. The filtering device according to claim 1, characterized in that: The filtering device further comprises a controller (15), a first sensor (7) for monitoring whether liquid is contained in the filtering funnel (1), and a second sensor (8) for monitoring whether liquid drips out from the lower end of the filtering funnel (1); the first valve (3) and the second valve (4) are both solenoid valves or electric valves; the first sensor (7), the second sensor (8), the first valve (3), the second valve (4) and the vacuum pump (6) are all electrically connected to the controller (15); the first sensor (7) and the second sensor (8) are capable of sending a first sensing signal and a second sensing signal to the controller (15) respectively; the controller (15) is capable of receiving the first sensing signal and the second sensing signal and is capable of controlling the switching of the first valve (3), the switching of the second valve (4) and the switching of the vacuum pump (6) according to the received first sensing signal and the second sensing signal.

3. The filtering device according to claim 1, characterized in that: A liquid discharge pipe (12) is provided at the lower end of the liquid receiving bottle (2), and a third valve (5) is connected to the liquid discharge pipe (12).

4. The filtering device according to claim 3, characterized in that: The filtering device further comprises a controller (15), a first sensor (7) for monitoring whether liquid is contained in the filtering funnel (1), a second sensor (8) for monitoring whether liquid drips out from the lower end of the filtering funnel (1), and a third sensor (9) for monitoring whether liquid is contained in the lower end of the receiving bottle (2); the first valve (3), the second valve (4), and the third valve (5) are all solenoid valves or electric valves; the first sensor (7), the second sensor (8), the third sensor (9), the first valve (3), the second valve (4), the third valve (5), and the vacuum pump (6) are all electrically connected to the controller (15); the first sensor (7), the second sensor (8), and the third sensor (9) are capable of sending a first sensing signal, a second sensing signal, and a third sensing signal to the controller (15), respectively; the controller (15) is capable of receiving the first sensing signal, the second sensing signal, and the third sensing signal and is capable of controlling the switching of the first valve (3), the switching of the second valve (4), the switching of the third valve (5), and the switching of the vacuum pump (6) according to the received first sensing signal, the second sensing signal, and the third sensing signal.

5. The filtering device according to any one of claims 1 to 4, characterized in that: The filter funnel (1) is a sand core funnel.

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