JP7197867B2 - Vacuum filtration device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vacuum filtration apparatus for solid-liquid separation of a stock solution poured into a funnel by causing the filtrate to flow down to the container side under reduced pressure and leaving a residue on the filter side of the funnel.

Vacuum filtration is a frequently performed operation in wet chemistry, and is routinely performed in a wide range of fields from basic science fields such as organic chemistry, inorganic chemistry and analytical chemistry to life science fields.

Such vacuum filtration has a long history, and the conventional vacuum filtration operation has generally been a method using a filter bell.

For example, Patent Document 1 (Japanese Utility Model Laid-Open No. 61-115113) describes a suction filter that uses a filter bell having a rubber-like material as a vacuum packing to improve workability and safety. .
Japanese Utility Model Laid-Open No. 61-115113

In the vacuum filtration operation using a filter bell, it is necessary to install a beaker or the like in the filter bell and connect the filter bell to a vacuum pump each time the operation is performed, so there is a problem that preparation takes a lot of time. there were. Moreover, since the filter bell is made of glass, it is heavy and difficult to handle. For this reason, it was hard work to raise and lower the filter bell every time the vacuum filtration operation was performed. As described above, the conventional vacuum filtration operation has the problems that the preparation requires a lot of time and effort, and that it requires a lot of labor to handle the heavy filter bell.

In order to solve the above problems, the vacuum filtration device according to the present invention provides a funnel with a filter arranged above the container, pours the stock solution into the funnel, and decompresses the inside of the container. In the vacuum filtration device that separates the undiluted liquid by leaving residue on the filter and allowing the filtrate to flow down to the container side, a first base on which the funnel is arranged above and a first base on which the funnel is arranged above the container a second base that communicates with the first base and the second base, a through hole through which the lead pipe of the funnel is inserted, and exhaust from the through hole and the container and a suction port, and the first base and the second base are provided in an elevating section that moves up and down.

Further, in the reduced-pressure filtration device according to the present invention, a first sealing member is arranged at a portion of the first base that contacts the funnel, and a portion of the second base that contacts the container has a , a second sealing member.

Further, in the vacuum filtration apparatus according to the present invention, the elevating section is moved up and down by driving an actuator.

Further, the reduced pressure filtration device according to the present invention includes a pressure sensor that detects the pressure in the through hole and the pressure in the container, and receives a detected value from the pressure sensor, and based on the detected value from the pressure sensor, the and a control unit that transmits a control command to the actuator.

Further, the reduced-pressure filtration device according to the present invention has a pump that exhausts air from the suction port, and the control unit transmits a control command to the pump based on the detected value from the pressure sensor. Characterized by

Moreover, the vacuum filtration apparatus according to the present invention is characterized in that the funnel is made of a synthetic resin material.

The vacuum filtration device according to the present invention can perform the filtration operation by exhausting air from the suction port. Therefore, according to the vacuum filtration device according to the present invention, there is no need to handle the filter cap, and the filtration operation can be performed. Time and labor for preparation can be saved, and filtration operation can be easily carried out.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the reduced-pressure filtration apparatus 1 which concerns on embodiment of this invention. FIG. 10 is a diagram for explaining the detailed structure of the bottom upper surface 266 of the liquid introducing portion 260 that constitutes the funnel 200. FIG. It is a figure explaining the structure of the raising/lowering part 5 of the pressure reduction filtration apparatus 1 which concerns on embodiment of this invention. It is a figure explaining the outline|summary of the reduced-pressure filtration operation by the reduced-pressure filtration apparatus 1 which concerns on embodiment of this invention. It is a figure which shows an example of the control flowchart of the pressure reduction filtration apparatus 1 which concerns on embodiment of this invention. 1 is a diagram showing a state of a reduced-pressure filtration device 1 (an exhaust system and a signal system are not shown) according to an embodiment of the present invention; FIG. FIG. 4 is a diagram showing an example of a profile of pressure detection values output by the pressure sensor 38 associated with a decompression filtration operation; It is a figure which shows schematic structure of the reduced-pressure filtration apparatus 1 which concerns on other embodiment of this invention. It is a figure which shows schematic structure of the reduced-pressure filtration apparatus 1 which concerns on other embodiment of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a vacuum filtration device 1 according to an embodiment of the present invention. The vacuum filtration device 1 according to the present invention does not use a filter bell, unlike the existing vacuum filtration operation.

For the vacuum filtration operation, a beaker 300, for example, is used as a receiver for the filtrate obtained by separating the stock solution from the residue (filtrate). A funnel 200 with a filter 250 is provided above the beaker 300 to perform vacuum filtration. In the reduced-pressure filtration device 1 according to the present invention, the stock solution is also poured into the funnel 200, the filtrate is allowed to flow down to the beaker 300 side, and the stock solution is separated by leaving a residue on the filter 250, but the present invention. In the vacuum filtration device 1 according to , the undiluted solution is separated by reducing the pressure in the space in the beaker 300 .

Any funnel that can be used in the vacuum filtration device 1 according to the present invention can be used as long as the bottom part follows the shape of the first base 10 of the elevating unit 5, but in this embodiment , the funnel 200 having a flat bottom 265 is used.

The funnel used in the present invention may be made of glass or metal, but in this embodiment, the funnel 200 is made of synthetic resin material such as polypropylene, polystyrene, or polytetrafluoroethylene. In the past, funnels that were frequently used for vacuum filtration operations were often made of glass and could not be disposable. can.

In addition, in existing disposable funnels that have been commercially available so far, the filter and funnel are integrated, so the filter alone could not be removed, but the filter 250 used in this embodiment can be separated from the funnel 200. configuration. This facilitates handling of the residue after the vacuum filtration operation. As the filter 250, for example, a general filter made of cellulose fibers can be used.

In FIG. 1, funnel 200 is shown in disassembled condition. The funnel 200 itself according to this embodiment is composed of a liquid storage section 220 and a liquid introduction section 260 . The liquid reservoir 220 has a first large-diameter cylindrical portion 221, a second small-diameter cylindrical portion 232, and a conical wall portion 225 extending from the first large-diameter cylindrical portion 221 to the second small-diameter cylindrical portion 232. doing.

In addition, the liquid introducing portion 260 includes a cylindrical wall portion 262 having a dimension that allows the outer circumference of the second cylindrical portion 232 to be temporarily fixedly fitted inside, and the cylindrical wall portion 262 communicating with the bottom of the funnel 200 itself. A bottom portion 265 to be formed, a guide opening 267 provided in the center of the bottom portion 265, a tubular guide pipe 270 continuing from the guide guide opening 267, and a discharge port 275 constituting the lower tip of the guide pipe 270. and

The filter 250 is attached to the funnel 200 so as to be sandwiched between the bottom end portion 235 of the second cylindrical portion 232 and the bottom portion 265 of the liquid introducing portion 260 . Filter 250 can be removed by separating liquid storage section 220 and liquid introduction section 260 . As described above, the funnel 200 used in this embodiment allows the filter 250 to be attached and detached easily.

The structure of the bottom upper surface 266 of the liquid introducing section 260 on which the filter 250 is placed will be described in more detail. FIG. 2 is a diagram for explaining the detailed structure of the bottom upper surface 266 of the liquid introducing portion 260 that constitutes the funnel 200. As shown in FIG. FIG. 2(A) is a photograph of the bottom upper surface 266 of the liquid introducing portion 260, and FIG. 2(B) is a cross-sectional view taken along line X-X' in FIG. 2(A).

The bottom upper surface 266 on which the filter 250 is placed is provided with a bottom surface 268 and a convex portion 269 having a predetermined height from the bottom surface 268 . The funnel 200 used in this embodiment has such a structure that the filter 250 is slightly floated by such a convex portion 269 .

In the example shown in FIG. 2, the convex portions 269 have a structure in which a plurality of arc-shaped convex portions 269 are arranged concentrically while being spaced apart from each other. The filtrate that has passed through the filter 250 flows through the grooves formed by the adjacent convex portions 269 and falls into the lead pipe 270 . If such a convex portion 269 were not provided, the filter 250 and the bottom surface 268 would be in close contact with each other, and efficient filtration would not be possible. The funnel 200 that can be used in this embodiment is not limited to the arrangement pattern of the convex portions 269 as shown in FIG. Can be adopted as appropriate.

FIG. 3 is a diagram for explaining the configuration of the elevating section 5 of the reduced-pressure filtration device 1 according to the embodiment of the present invention. During the vacuum filtration operation, the elevating unit 5 on which the funnel 200 as described above is placed consists of a first base 10 on which the funnel 200 is arranged, a second base 20 on which the beaker 300 is arranged, It is composed of a connecting portion 12 that connects the first base 10 and the second base 20 . Such an elevating section 5 can be made of, for example, a synthetic resin material.

The main through hole 13 is a hole that penetrates the first base 10, the second base 20, and the connecting portion 12. During the vacuum filtration operation, the down pipe 270 of the funnel 200 passes through the main through hole 13. It will be in the inserted state. Here, when the funnel 200 is placed on the elevating section 5 , the discharge port 275 forming the lower end portion of the down pipe 270 is preferably sized to pass through the main through hole 13 .

A lead-out portion 16 is provided in a portion of the connecting portion 12 , and a secondary through-hole 17 communicating with the main through-hole 13 is provided inside the lead-out portion 16 . The cavity forming the secondary through-hole 17 is connected to the suction port 18 , and the air pressure inside the main through-hole 13 and the secondary through-hole 17 can be reduced by the exhaust from the suction port 18 .

In the present embodiment, the connecting portion 12 is provided with the drawer portion 16 provided with the suction port 18 , but providing such a drawer portion 16 on the connecting portion 12 is not an essential requirement. In short, the drawer 16 may be provided at another position as long as the suction port 18 can exhaust air so that the pressure in the discharge port 275 of the funnel 200 and the space in the beaker 300 is lower than the atmospheric pressure. .

A donut-shaped first sealing member 41 in a plan view is attached to a portion of the upper surface of the first base 10 of the lifting section 5 that contacts the funnel 200 . A donut-shaped second sealing member 42 in plan view is adhered to a portion of the lower surface of the second base 20 that contacts the opening peripheral edge 310 of the beaker 300 . For the first sealing member 41 and the second sealing member 42, rubber materials such as nitrile rubber, silicon rubber, urethane rubber, etc., which have high sealing properties, can be suitably used.

Since the first sealing member 41 as described above is provided, when the bottom portion 265 of the funnel 200 is placed on the upper surface of the first base 10, the main through hole 13 on the side of the first base 10 is sealed. The Rukoto. On the other hand, the second sealing member 42 on the lower surface of the second base 20 is such that when the elevating unit 5 is lowered and the opening peripheral edge 310 of the beaker 300 contacts the second sealing member 42, the opening peripheral edge 310 of the beaker 300 is sealed. It will be done.

The position sensor built-in actuator 50 has an expansion rod 52 that expands and contracts in the vertical direction in the figure. The energy for driving the telescopic rod 52 may be electricity or compressed air. Further, the lower surface of the position sensor built-in actuator 50 is attached to the tool base 3 .

The telescopic rod 52 of the position sensor built-in actuator 50 is fixed to the lifting section 5, and the lifting section 5 moves up and down when the position sensor built-in actuator 50 is driven. As the elevating unit 5 ascends and descends, the reduced-pressure filtration device 1 according to the present invention has a state in which the second base 20 side of the elevating unit 5 is separated from the beaker 300 and a state in which the second base 20 side of the elevating unit 5 is separated from the beaker 300. It is designed to be able to take two states, a contact state and a contact state.

Here, in this specification, in the former state, the expansion rod 52 of the actuator with built-in position sensor 50 and the lifting section 5 are in the "high" state, and in the latter state, the expansion rod of the actuator with built-in position sensor 50 52 and the raising/lowering part 5 are assumed to be in the "low" state.

In the present embodiment, changing whether the elevation unit 5 is at a high position or at a low position is realized by driving the actuator 50 with a built-in position sensor. can also be configured to

A pump 35 is connected to a suction port 18 in the drawer 16 of the lifting unit 5 via a pipe 30 so that air can be exhausted from the suction port 18 . FIG. 4 is a diagram for explaining an overview of the vacuum filtration operation by the vacuum filtration device 1 according to the embodiment of the present invention. As shown in FIG. 4, after the lifting unit 5 is set to the "low" state, the pump 35 performs an exhaust operation, thereby opening the secondary through-hole 17, the main through-hole 13 communicating with the secondary through-hole 17, and further The space in the beaker 300 communicating with it is at a pressure lower than the atmospheric pressure. As a result, the undiluted solution poured into the funnel 200 leaves a residue on the filter 250, and the filtrate drips into the beaker 300, thereby separating the solid content and the liquid content.

A pressure sensor 38 is provided in the pipe 30 so that the pressure in the pipe 30, that is, the pressure in the secondary through-hole 17 and the main through-hole 13 communicating with the pipe 30 can be detected. there is A pressure value detected by the pressure sensor 38 is transmitted to the control unit 100 . In the drawings, dotted arrows indicate the flow of signals.

The control unit 100 can use, for example, an information processing device such as a general-purpose microcomputer including a CPU, a ROM that holds a program that runs on the CPU, and a RAM that is a work area for the CPU. Such a control unit 100 performs data communication with each component connected in FIG. 1, FIG. You can do it.

A pump 35 for exhausting air from the suction port 18 of the lifting section 5 is connected to the control section 100 and can be turned on and off based on a control command from the control section 100 . A diaphragm pump, for example, can be used as the pump 35 .

A solenoid valve 39 is provided in the pipe 30 . Normally, the solenoid valve 39 is closed, but by opening the solenoid valve 39, it is possible to purge the pressure in the pipe 30 to the atmospheric pressure. The solenoid valve 39 performs an opening operation based on a control command from the control section 100 .

Further, the control unit 100 can acquire data relating to the position of the telescopic rod 52 detected by the actuator 50 with a built-in position sensor. In the present embodiment, the position sensor built-in actuator 50 detects whether the telescopic rod 52 is "high" or "low" and transmits this to the control unit 100. FIG.

The control unit 100 is provided with an input/output unit 110 operated by the user of the reduced-pressure filtration device 1 . Through this input/output unit 110, the reduced-pressure filtration device 1 side can output information to the user, and the user can input a desired operation or the like to the reduced-pressure filtration device 1. be able to.

The output function of the input/output unit 110 can be realized by, for example, a display panel, display lamps, audio output, and the like. Also, the input function of the input/output unit 110 can be realized by, for example, a touch panel, a push button switch, voice input, or the like.

An operation example of the reduced-pressure filtration device 1 according to the present invention configured as described above will be described. FIG. 5 is a diagram showing an example of a control flowchart of the reduced-pressure filtration device 1 according to the embodiment of the present invention. In FIG. 5 , the right column indicates the steps of the control section 100 and the left column indicates the steps of the input/output section 110 .

FIG. 6 is a diagram showing the state of the reduced-pressure filtration device 1 according to the embodiment of the present invention. FIG. 6 shows how the procedure of the vacuum filtration operation progresses in order from (A) to (F). Also, in FIG. 6, the exhaust system and the signal system of the reduced-pressure filtration device 1 are omitted from the illustration.

In step S200 of FIG. 5, when the input/output unit 110 detects that the user has turned on the main power supply (not shown) of the decompression filtration device 1, in the following step S101 of the control unit 100, the position sensor built-in actuator 50 Based on the detection signal from , it is determined whether the state of the telescopic rod 52 is "high". When the determination result is YES, the process proceeds to step S201.

If the determination result in step S101 is NO, that is, if the lifting unit 5 is lowered and the state of the telescopic rod 52 is "low", the process proceeds to step S102, where the pressure detection value detected by the pressure sensor 38 is detected. is equal to atmospheric pressure.

If the determination result in step S102 is YES, then the process proceeds to step S104, and a control signal is transmitted to set the state of the telescopic rod 52 of the actuator 50 with built-in position sensor to "high". As a result, the lifting unit 5 is lifted, the determination in step S101 becomes YES, and the process proceeds to step S201.

On the other hand, if the determination result in step S102 is NO, the process proceeds to S103, issues a purge control command to the solenoid valve 39, opens the solenoid valve 39, and sets the pressure in the pipe 30 to atmospheric pressure. After performing such purging, the process returns to step S102, and it is checked again whether the pressure detection value detected by the pressure sensor 38 is equal to the atmospheric pressure.

In step S<b>201 , the input/output unit 110 notifies the user that the equipment such as the funnel 200 and the beaker 300 can be set in the reduced-pressure filtration device 1 . FIG. 6A shows the state of the vacuum filtration device 1 at this time. Here, the user sets the funnel 200 and the beaker 300 in the reduced-pressure filtration device 1, and executes input from the input/output unit 110 to the effect that the instrument setting is completed in the state shown in FIG. 6(B).

Subsequently, in step S105, the control unit 100 determines whether or not the pressure detection values obtained from the pressure sensor 38 are equal to the atmospheric pressure. If the determination result in step S105 is NO, it is possible that some kind of abnormality has occurred in the apparatus, so an error is displayed on the input/output unit 110 or the like, and the control process is interrupted.

On the other hand, if the atmospheric pressure is detected by the pressure sensor 38 and the determination result in step S105 is YES, in step S106, a control signal is transmitted to set the state of the telescopic rod 52 of the actuator 50 with built-in position sensor to "low". . The state of the vacuum filtration device 1 at this time is shown in FIG. 6(C). In the state of FIG. 6C, the opening edge 310 of the beaker 300 is in contact with the lower surface of the second base 20 .

Subsequently, in step S203, the input/output unit 110 notifies the user that the stock solution to be separated can now be injected into the funnel 200. FIG. Here, as shown in FIG. 6D, the user injects the stock solution into the funnel 200, and in step S204, inputs from the input/output unit 110 that the injection of the stock solution has been completed.

After the input to the input/output unit 110 is performed in step S204, the control unit 100 issues a control command to turn on the pump 35 in step S107. Then, the pump 35 is driven, the air is exhausted from the suction port 18, and the space in the beaker 300 is decompressed. Along with this, as shown in FIG. 6(E), the undiluted solution poured into the funnel 200 is pulled toward the beaker 300 due to the pressure difference from the atmospheric pressure. At this time, a vacuum filtration operation is performed in which only the filtrate flows down to the beaker 300 side and the residue remains on the filter 250 .

The pressure detection value detected by the pressure sensor 38 is monitored by the control unit 100 . FIG. 7 is a diagram showing an example of the profile of the pressure detection values output by the pressure sensor 38 accompanying the decompression filtration operation. In FIG. 7, the horizontal axis indicates time and the vertical axis indicates the pressure detection values.

In FIG. 6, after the pump 35 is turned on, during the period (p), the pressure detection value from the pressure sensor 38 decreases at a relatively fast pace, and the filtration operation progresses. Before and after all the undiluted solution in the funnel 200 passes through the filter 250, it changes for a certain period while taking a minimum value (period of (q)), and then the detected pressure value gradually increases again as indicated by the period of (r). continue. After that, ΔP=(atmospheric pressure)−(detected pressure value) remains almost constant during the period (s). This ΔP depends on the exhaust capacity of the pump 35 .

In step S108, it is determined whether or not ΔP as described above is equal to or less than a certain value and the period detected as (s) as described above has exceeded a predetermined time T or more. In the reduced-pressure filtration device 1 according to the present invention, by detecting the steady period (s), it is determined whether or not the filtration operation has been completed.

If the determination in step S108 is YES, then the process proceeds to step S109 and the pump 35 is turned off. In subsequent step S110, a purge control command is issued to the solenoid valve 39 to open the solenoid valve 39. As shown in FIG. As a result, the pressure in the pipe 30 is brought to the atmospheric pressure, and the space inside the beaker 300 is brought to the atmospheric pressure regardless of the characteristics such as the viscosity of the stock solution. As a result, it is possible to prevent the trouble that the beaker 300 and the second sealing member 42 are not separated from each other when the elevating section 5 is raised.

In step S111, it is determined whether or not the pressure detection value detected by the pressure sensor 38 is equal to the atmospheric pressure. If the determination result in step S111 is YES, then the process proceeds to step S112, and a control signal is transmitted to set the state of the telescopic rod 52 of the actuator 50 with built-in position sensor to "high". Thereby, the raising/lowering part 5 is raised.

In step S113, it is determined whether the position of the telescopic rod 52 obtained from the actuator 50 with a built-in position sensor is "high", thereby confirming that the lifting section 5 is certainly raised. If the determination in step S113 is YES, the process proceeds to step S205, and the input/output unit 110 notifies the user that the decompression filtering operation is completed and the funnel 200 and beaker 300 can be taken out.

In response to such notification, the user can take out the beaker 300 containing the filtrate and the funnel 200 containing the filter 250 in which the residue remains from the vacuum filtration device 1 .

As described above, the vacuum filtration device 1 according to the present invention can perform a filtration operation by exhausting air from the suction port 18. Therefore, according to the vacuum filtration device 1 according to the present invention, the filter can be removed. It eliminates the need for handling, saves time and labor for preparing for the filtration operation, and makes it possible to easily perform the filtration operation.

In addition, in the vacuum filtration device 1 according to the present invention, by using the actuator 50 with a built-in position sensor, etc., it is possible to automatically perform many steps of the filtration operation, and the labor involved in the conventional manual filtration operation can be reduced. be released from

Further, in the vacuum filtration device 1 according to the present invention, if the disposable funnel 200 as in this embodiment is used, it is possible to easily take out the residue remaining on the filter 250 .

Next, another embodiment of the present invention will be described. FIG. 8 is a diagram showing a schematic configuration of a vacuum filtration device 1 according to another embodiment of the present invention. In this figure, an exhaust system and a signal system are omitted. This embodiment is a combination of the vacuum filtration device 1 according to the present invention and a pipette system (Japanese Patent Application No. 2019-60067) by the present inventor.

In the pipette system described above, the articulated robot 180 moves the electric pipette 190 to perform dispensing at a designated position. By combining such a pipette system with the vacuum filtration device 1 according to the present invention, it becomes possible to automate the process of pouring the stock solution into the funnel 200 in the vacuum filtration operation.

According to such an embodiment, in addition to the effects of the previous embodiment, by computer-controlling all of the vacuum filtration device 1, the electric pipette 190, and the articulated robot 180, all the series of steps of the vacuum filtration operation can be performed manually. It is also possible to make it independent of

Next, another embodiment of the present invention will be described. FIG. 9 is a diagram showing a schematic configuration of a vacuum filtration device 1 according to another embodiment of the present invention. In FIG. 9, descriptions of the configurations having the same reference numbers as the configurations described so far will be omitted. This embodiment is configured to simultaneously perform a plurality of filtering operations. In this embodiment, an example in which two filtering operations are performed simultaneously will be described, but it can be configured so that three or more filtering operations can be performed. In FIG. 9, the configuration for performing the filtering operation on the left side is called the first system, and the configuration for performing the filtering operation on the right side is called the second system.

In this embodiment, two first bases 10 are provided in the lifting section 5 so that two funnels 200, 200' can be placed thereon in order to perform two filtration operations at the same time. In addition, as shown in 3', a portion of the instrument base 3 is provided with a raised portion so that a beaker 300' different in size from the beaker 300 can be placed.

In the present embodiment, the two suction ports 18 corresponding to each first base 10 are configured to exhaust air by a single pump 35 in common. A pump 35 may be provided.

Corresponding to the two suction ports 18, a first pressure sensor 161 and a second pressure sensor 162 are provided in the pipe 30 to detect the pressure at each suction port 18. is taken into the personal computer 150 . In this embodiment, the personal computer 150 is used as an example of an information processing device for controlling the reduced pressure filtration device 1, but other information processing devices can also be used.

A first solenoid valve 151 and a second solenoid valve 152 are provided in the pipe 30 provided with each pressure sensor, and these solenoid valves can be opened and closed based on a control command from the personal computer 150. can be done. The pump 35 provided in common to the first system and the second system is turned on and off based on a control command from the personal computer 150 .

By providing the two first solenoid valves 151 and the second solenoid valves 152, in this embodiment, the filtering operation of the first system and the filtering operation of the second system can be performed independently. For example, by opening the first solenoid valve 151, closing the second solenoid valve 152, and exhausting the gas with the common pump 35, the filtering operation can be performed only by the first system. Further, by opening both the first solenoid valve 151 and the second solenoid valve 152 and exhausting the gas with the common pump 35, the filtering operation can be performed in both the first system and the second system.

In this embodiment, an air-driven actuator 175 using compressed air is used to move the lifting section 5 up and down. Compressed air is supplied from the compressed air conduit 170 to the air driven actuator 175 . A third electromagnetic valve 153 that opens and closes based on a control command from the personal computer 150 is provided in the flow path of the compressed air conduit 170, whereby the elevation operation of the elevation unit 5 is controlled by the personal computer 150. can be controlled.

According to such an embodiment, in addition to the effects of the previous embodiment, a plurality of filtering operations can be performed simultaneously, making it possible to further improve work efficiency.

As described above, the vacuum filtration device according to the present invention can perform a filtering operation by exhausting air from the suction port. Time and labor for preparation for operation can be saved, and filtration operation can be easily carried out.

REFERENCE SIGNS LIST 1... Reduced-pressure filtration devices 3, 3'... Instrument stand 5... Lifting part 10... First base 12... Connection part 13... Main through hole 16... Drawer part 17 Sub-through hole 18 Suction port 20 Second base 30 Piping 35 Pump 38 Pressure sensor 39 Solenoid valve 41 First seal Member 42 Second sealing member 50 Actuator with built-in position sensor 52 Expansion rod 100 Control unit 110 Input/output unit 150 Personal computer (information processing device)
151 First solenoid valve 152 Second solenoid valve 153 Third solenoid valve 161 First pressure sensor 162 Second pressure sensor 170 Compressed air conduit 175 Air-driven actuator 180 Articulated robot 190 Electric pipette 200, 200' Funnel (for example, disposable)
220... Liquid storing part 221... First cylindrical part 225... Conical wall part 232... Second cylindrical part 235... Bottom end part 250... Filter 260... Liquid introducing part 262 ... Cylindrical wall portion 265 ... Bottom portion 266 ... Bottom upper surface 267 ... Lead opening 268 ... Bottom surface 269 ... Convex portion 270 ... Down pipe 275 ... Exhaust Outlet 300, 300'... beaker (container)
310... Opening edge

Claims (6)

A funnel with a filter is provided above the container, the stock solution is poured into the funnel, and the pressure in the container is reduced to leave residue on the filter and allow the filtrate to flow down to the container side. In the vacuum filtration device that separates the stock solution,
a first base on which the funnel is arranged;
a second base arranged above the container;
a through hole that communicates the first base and the second base and through which the down pipe of the funnel is inserted;
having a suction port for exhausting air from the inside of the through hole and the inside of the container,
A decompression filtering device , wherein the first base and the second base are provided in an elevating section that moves up and down. A first sealing member is disposed on a portion of the first base that contacts the funnel, and
2. The reduced-pressure filtration device according to claim 1, wherein a second sealing member is disposed on a portion of said second base that contacts said container. 3. The reduced-pressure filtration device according to claim 1, wherein the elevating section is moved up and down by driving an actuator. a pressure sensor that detects the pressure in the through-hole and in the container;
4. The decompression filtration according to claim 3 , further comprising a control unit that receives a detected value from the pressure sensor and transmits a control command to the actuator based on the detected value from the pressure sensor. Device. Having a pump for exhausting air from the suction port,
5. The reduced-pressure filtration device according to claim 4 , wherein the control unit issues a control command to the pump based on the detected value from the pressure sensor. 6. The vacuum filtration device according to any one of claims 1 to 5 , wherein the funnel is made of a synthetic resin material.

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