JP2000335505A5 - - Google Patents

Description

[0002]
[Prior Art]
In order to eject a desired amount of liquid, a liquid dispensing apparatus for dispensing the liquid from the liquid storage container via a dispensing valve is used, and to apply the liquid in a desired shape, the above-mentioned liquid dispensing apparatus and If to use a method of using or robot to move the nozzle adherend (work) is general. the more liquid medium viscosity example, filling liquid tank, especially to syringes, many 2 as shown, the liquid outlet pipe (3) is provided in advance the liquid (L) is filled the pressure vessel (2), a liquid storage container to the outlet of the outlet pipe (3) (1), especially connect a syringe to the airtight, through the liquid outlet pipe (3) filling the liquid into the syringe by pressurizing the air to liquid (L) in the pressure vessel (2).

[0013]
The plunger is pushed when a forward rotation signal is sent to the drive unit. The plunger pulls when a reverse signal is sent to the drive . Go extruding liquid in the pressurized air to the pressure vessel. When detection instrument attached to the pressure vessel reaches a residual low level, and sends the remaining low signal remaining low sensor to the control unit. When the detector attached to the plunger on the liquid storage container side reaches the full level, the full sensor sends a full signal to the control unit. The pressure sensor in the liquid outlet pipe always sends a measured pressure data signal to the control unit.

[0015]
【Example】
Although the details of the present invention will be described in the embodiment shown in FIG. 1 , the present invention is not limited by this embodiment.
The same reference numerals are given to the parts common to the conventional apparatus in the description.

[0016]
Example
The pressure vessel (2) contains a liquid (L) to be filled in the liquid storage vessel (1) . The pressure container (2 ) is provided with a low remaining amount detection sensor (17) having a low remaining amount detection tool (18) . This is a sensor that detects that the liquid level is lower than the position of the low remaining amount detector (18) . Further, in the pressure vessel (2), a liquid suction pipe (4) is inserted into the pressure vessel (2). Further , an air pressurizing pipe (not shown) is in communication with the pressure vessel (2) from above. The air pressurizing tube is attached to an air source (not shown) capable of supplying air at a desired pressure. The pressure vessel (2) is sealed so that the supplied air does not leak out.
The liquid suction pipe (4) is connected to one end of the liquid outlet pipe (3) in communication . Middle pressure sensor for measuring the liquid pressure in the liquid outlet pipe (3) in the liquid outlet pipe (3) (14) is mounted. The end opposite to the connection of the liquid suction pipe (4 ) of the liquid outlet pipe (3 ) is provided with a mounting port (5) from which the liquid storage container (1) can be removed. Attach the discharge port of (1) to this mounting port (5) .
Liquid container (1) is substantially cylindrical, the liquid container (1) inside the adherable and sliding on the inner wall of the liquid container (1) a cylindrical plunger (11) is inserted ing. The plunger (11) is connected to the plunger holding rod (10) on the opposite side to that facing the discharge port .
In addition, a full amount detector (16) for detecting the full amount of the liquid storage container (1 ) is attached to the plunger (11) . Working with the full amount detection sensor (15) attached to the outer wall of this full amount detection tool (16) , the full amount detection tool (16) comes to the same height as the full amount detection sensor (15) Detect
An air relief hole (13) is provided at the center of the plunger (11) , and the air relief hole (13) continues into the plunger holding bar (10) . The plunger holding bar (10) has a valve (12) for opening and closing the communication between the air release hole (13) in the plunger holding bar (10 ) and the outside . The plunger holding rod (10) is connected to the linear movement mechanism (9) .
The linear movement mechanism (9) is screwed into a ball screw (7) rotated by a drive unit (6) . Further, one end of the linear motion mechanism (9) is attached to the linear motion cage (8) . The linear motion holder (8) has a slide rail and a slide portion which can slide on the slide rail.
The pressure sensor (14) , the full amount detection sensor (15) , the low remaining amount detection sensor (17) and the drive unit (6) are connected to the control unit (20) .
Next, a method of filling the liquid storage container with the liquid using the filling apparatus having the above configuration will be described.
Preparation process
Exhaust excess air in the system before beginning the filling operation. This is done as follows.
Position the plunger (11) inserted in the liquid storage container (1) at the lowest end, and set the space between the discharge port of the liquid storage container (2) and the plunger bottom as small as possible . Most preferably, the space between the discharge port of the liquid storage container (1) and the bottom of the plunger is zero. Further , the valve (12 ) in the plunger holding rod (10) is set in the open state so that the air release hole (13) communicates with the outside.
Sending air to the air pressure tube in this state (not shown) from the pressure vessel (2), the liquid in the pressure vessel (2) is ejection of through the liquid suction pipe (4) the liquid tank (1) The liquid moves from the outlet to the bottom of the plunger, and the liquid suction pipe (4) , the liquid outlet pipe (3) , the air in the space from the discharge port of the liquid storage container (1) to the bottom of the plunger Is pushed up to the liquid (L ) in the pressure vessel (2) and discharged to the outside air through the air release hole (13) in the plunger (11) . This operation is performed until the liquid starts to spill out of the air release hole (13), and when it begins to spill, the valve (12) is closed to stop the supply of air from the air pressure pipe.
The discharge of excess air in the device is completed , and the liquid (L ) is taken from the liquid suction pipe (4) , the liquid outlet pipe (3) , and the discharge port of the liquid storage container (1) to the bottom of the plunger. Filled with ) .
<< filling process >>
The pressure supplied to the pressure vessel (2) from the air pressurizing pipe (this pressure is called air pressure) is set and input to the control unit (20) . Further, a pressure value in the liquid storage container (1) (this pressure value will be referred to as a pressure setting value) desired is set to a value lower than the air pressure and input to the control unit (20) .
Thereafter, when the apparatus is operated , air of a desired air pressure is sent from the air pressurizing pipe to the pressure vessel (2) according to a signal from the control unit (20) . Thereby , the liquid (L) in the pressure vessel (2 ) is pressurized. At the same time, the liquid in the liquid suction pipe (4) , the liquid outlet pipe (3) , and the liquid in the liquid storage container (1) is also pressurized. The pressure sensor (14) measures the pressure value of this liquid (this pressure value is called a pressure measurement value) and sends it to the control unit (20) . The control unit (20) compares this pressure measurement value with the previous pressure setting value, and if the pressure measurement value is lower than the pressure setting value, the control unit (20) sends the normal rotation signal to the driving unit (6) . feed, rotates the ball screw (7) to move in a direction toward the plunger (11) to the discharge port, if the pressure measurement value is higher than the pressure setpoint driver reverse rotation signal from the control unit (20) (6 And the ball screw (7) is rotated so that the plunger (11) moves in the direction away from the discharge port .
In this way, since as the pressure of the liquid container (1) inside is low pressure set value than the air pressure in the pressure vessel (2) plunger (11) moves, as a result the plunger (11) The liquid moves little by little in the direction away from the discharge port , and the liquid (L) is filled into the liquid storage container (1) .
Thereafter, full amount detection device (16) comes when the full amount detection sensor (15) is reacted with the control to the height of the full amount detection sensor (15) attached to the plunger (11) of the liquid container (1) A signal is sent to the part (20) to stop the supply of air pressure and the driving of the drive part (6) . Also, when the liquid level in the pressure vessel (2) decreases and the liquid level reaches the height of the low remaining amount detection tool (18) , the low remaining amount detection sensor (17) reacts and the control unit (20) Signal to stop the supply of air pressure and stop the drive of the drive unit (6) .
After stopping the supply of air pressure and stopping the driving of the drive unit (6) , the plunger (11) is removed from the liquid storage container (1) , but at this time, the valve of the plunger holding rod (10) When (12) is opened and the air release hole (13) and the outside are communicated with each other and then removed, the plunger (11) can be smoothly removed without the pressure in the liquid decreasing. Thereafter, the liquid storage container (1) is removed from the liquid outlet port piping (3) , and the filling operation is completed.
By performing the filling operation according to the above method, the pressure of the liquid does not become unexpectedly low and does not evaporate.
In addition, since the liquid storage container is sealed not in the atmospheric state, and filling is performed in this sealed space, the liquid is discharged to keep the thickness of the inner diameter of the syringe connection port into the syringe while entraining air bubbles. It does not fill the liquid and does not involve air bubbles.
In addition, since the pressure of the liquid does not change unexpectedly, the temperature of the liquid does not rise and fall rapidly, so the operator does not have to adjust the filling speed while monitoring.
Further, since the fullness of the liquid storage container or the low level of the pressure container can be detected, the full automatic filling can be performed.
If the pressure setting value is a pressure lower than the air pressure, it may be set by the difference from the air (normal pressure value) or by the difference from the air pressure.
It is preferable that the tip of the liquid suction pipe be provided at a lower position than the detector, since the tip is always in the liquid.
It is desirable that the air pressurizing pipe be located higher than the liquid level in the pressure vessel, because air bubbles are not trapped in the liquid.
In this embodiment, the pressure of the liquid in the liquid storage container is measured by the pressure sensor of the liquid outlet port piping, but the pressure of the liquid in the liquid storage container may be measured directly.

[0031]
【Effect of the invention】
When filling the liquid storage container, in particular the syringe, the entrainment of air bubbles can be eliminated and the filling of the liquid can be processed automatically, so that the filling operation can be unmanned .

Brief Description of the Drawings
FIG. 1 is a schematic view of a liquid filling apparatus of the present invention.
FIG. 2 is a schematic view of a conventional liquid filling apparatus .
FIG. 3 is an explanatory view of a problem of the conventional liquid filling apparatus .

[Description of the code]
DESCRIPTION OF SYMBOLS 1 Liquid storage container 2 Pressure container 3 Liquid extraction port piping 4 Liquid suction pipe 5 Attachment port 6 Drive part 7 Ball screw 8 Direct-acting cage 9 Direct-acting mechanism 10 Plunger holding rod 11 Plunger 12 Valve 13 Air relief hole 14 Pressure Sensor 15 Full amount detection sensor 16 Full amount detection tool 17 Low remaining amount detection sensor 18 Low remaining amount detection device 19 Air pressurization tube 20 Control part L Liquid

Claims (10)

When filling the liquid storage container with the liquid from the pressure container in which the liquid is stored in advance, there is no mixture of air bubbles which controls the liquid pressure in the liquid storage container to a constant pressure lower than the air pressure pressurized to the pressure container. Liquid filling method. The liquid filling method according to claim 1, wherein fullness of the liquid storage container is detected and the filling is automatically stopped. 3. A liquid filling method according to claim 1, wherein the low level of the pressure vessel is detected and the filling is automatically stopped. A method according to any one of claims 1 to 3 for removing air bubbles generated in the liquid storage container unexpectedly. Liquid storage container having a plunger inserted airtightly, pressure container containing liquid in advance, and plan to maintain a constant pressure in the liquid storage container lower than air pressure pressurized to the pressure container A filling device for a liquid storage container which has a linear motion control mechanism portion of a jar and can be filled automatically without mixing of air bubbles. 6. The apparatus for filling a liquid storage container according to claim 5, further comprising means for detecting the fullness of the liquid storage container, wherein the filling is automatically stopped by a detection signal. 7. The apparatus for filling a liquid storage container according to claim 5, further comprising means for detecting the low level of the pressure container, wherein the filling is automatically stopped in response to the detection signal. The device according to any one of claims 5 to 7, further comprising means for detecting the pressure of the liquid filled in the liquid storage container from the pressure container, and driving the linear motion control mechanism based on the detection signal. Device for filling a liquid storage container as described. 9. The apparatus for filling a liquid storage container according to claim 8, wherein the means for detecting the pressure is provided in a liquid outlet port pipe connecting the pressure container and the liquid storage container. Providing a valve structure having an air release hole communicating with the outside from a plunger inserted into the liquid storage container and closing the hole any time, and removing air bubbles generated in the liquid storage container unexpectedly The apparatus for filling a liquid storage container according to any one of claims 5 to 9, which can

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