JP3741538B2 - Automatic extraction device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic extraction apparatus, and more particularly to an automatic extraction apparatus that can inhale various types of measurement liquids and that does not adversely affect the environment by returning the measured measurement liquid to the original state.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, when performing various measurements by putting a measurement liquid in a measurement container, it was necessary to wash and dry the entire measurement container every time the measurement was performed. Therefore, various measurements of the measurement liquid could not be performed automatically.
[0003]
The present invention has been made by paying attention to such a conventional technique, and provides an automatic extraction device capable of automatically performing various measurements of a measurement liquid.
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, a sensor is inserted from the top into a sealed measurement container, a pressure reducing / pressurizing means is connected to the top of the measurement container via a first pipe, and a three-way valve is connected to the bottom of the measurement container. The second pipe for the measurement liquid and the third pipe for the drain are connected to each other, the fourth pipe is connected to the position facing the sensor tip at the lower part of the measurement container, and the cleaning liquid and the air can be supplied to the fourth pipe. It is a thing.
[0005]
According to the first aspect of the present invention, the measurement liquid is automatically sucked into the measurement container through the second pipe by generating the reduced pressure state by the pressure reduction / pressurization means and opening the second pipe. Is done. Then, after measuring the inhaled measurement liquid with a sensor, if a pressurized state is generated by the pressure reduction / pressure means, the measurement liquid in the measurement container is returned to the original state via the second pipe. And while cleaning the front-end | tip of a sensor with the washing | cleaning liquid supplied from 4th piping, the sensor after washing | cleaning can be dried with air. The cleaning liquid is also discharged from the third drain pipe. After washing and drying the sensor, the measurement liquid can be again sucked into the measurement container and the measurement liquid can be repeatedly detected.
[0006]
The invention according to claim 2 is provided with a check valve for preventing the flow from the measurement container in the fourth pipe.
[0007]
According to the invention described in claim 2, since the check valve is provided in the fourth pipe, it is possible to reliably prevent the measurement liquid from flowing back into the fourth pipe from the measurement container.
[0008]
According to a third aspect of the present invention, the pressure reducing / pressurizing means generates pressure reduction and pressure by reciprocating the piston in the cylinder.
[0009]
According to the third aspect of the present invention, since the pressure reducing / pressurizing means has a structure for generating pressure reduction and pressurization by reciprocating the piston in the cylinder, both pressure reduction and pressurization are obtained with one structure. be able to.
[0010]
In the invention according to claim 4, the measurement container and the piping system are formed of a chemical resistant material.
[0011]
According to the invention described in claim 4, since the measurement container and the piping system are formed of a chemical resistant material, it is possible to measure even a highly corrosive measurement solution.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0013]
1-7 is a figure which shows 1st Embodiment of this invention. 1 to 4 are views of an actual apparatus as viewed from the side and from above, and FIG. 5 is a schematic view showing the structure of the apparatus.
[0014]
In the figure, reference numeral 1 denotes a measuring container, which has chemical resistance made of glass and Teflon. A sensor 2 for pH measurement can be inserted and installed from the top of the measurement container 1. Depending on the type of sensor 2, two or more sensors can be inserted and installed. Further, the sensor 2 is not limited to pH measurement, and a sensor that measures COD, BOD, concentration, turbidity, and the like can also be employed.
[0015]
Connected to the upper portion of the measurement container 1 is a first pipe 3 for depressurizing and pressurizing the inside of the measurement container 1. A valve 4 is interposed in the first pipe 3. This valve 4 is normally open. At a position facing the tip of the sensor 2 in the lower part of the measurement container 1, a fourth pipe 5 that can supply cleaning liquid and air is connected. A common pipe 9 is connected to the bottom of the measurement container 1. The second pipe 6 for the measurement liquid and the third pipe 7 for the drain are connected via a three-way valve 8. The three-way valve 8 includes a drain valve 8a and an extraction valve 8b. In FIG. 3, 10 is a power switch, 11 is an operation switch, and 12 is a power cord.
[0016]
The first pipe 3 is connected to a suction compression cylinder portion 13 as “pressure reduction / pressurization means”. The suction compression cylinder portion 13 has a structure in which the piston 14 is reciprocated by the motor 15 in the cylinder. By connecting the first pipe 3 to one space partitioned by the piston 14, Depending on the direction of movement, depressurization and pressurization occur. The power of the motor 15 is transmitted to the shaft 17 of the piston 14 via the belt 16.
[0017]
The third pipe 7 is branched into three by two three-way valves 18 and 19 (formed by two valves 18a, 18b, 19a and 19b, respectively), and is inserted into the three raw material tanks 20, 21 and 22. ing. In the raw material tanks 20, 21, and 22, separate measurement liquids 20a, 21a, and 22a are contained, respectively.
[0018]
The fourth pipe 5 is branched into a cleaning liquid pipe 23 and an air blow pipe 24. The cleaning liquid pipe 23 is provided with a cleaning valve 25, and the air blow pipe 24 is provided with an air valve 26. It has been. A check valve 27 is provided in the fourth pipe 5. As shown in FIG. 7, the check valve 27 includes a check piece 28, a shaft 29 that supports the piece 28, and a spring 30 that urges the piece 28 in the check direction. .
[0019]
Next, the operation of this automatic extraction apparatus will be described based on the schematic diagram of FIG. 5 and the timing chart of FIG. In this embodiment, first, an example in the case of measuring the measurement liquid 20a in the raw material tank 20 will be described. Accordingly, the three-way valves 18 and 19 reaching the other raw material tanks 21 and 22 are closed.
[0020]
First, the operation switch 11 is turned on. Next, the piston 14 of the suction compression cylinder portion 13 is raised by a predetermined stroke (in FIG. 1). The rise of the piston 14 automatically stops after the limit point. When the piston 14 rises, the first pipe 3 is decompressed, while the extraction valve 8b is open, so that the measurement liquid 20a in the raw material tank 20 passes through the second pipe 6. A predetermined amount is inhaled into the measurement container 1. Therefore, pH measurement by the sensor 2 is possible.
[0021]
When the measurement is completed, the piston 14 of the suction compression cylinder portion 13 is lowered (in FIG. 1) by a predetermined stroke. The lowering of the piston 14 automatically stops after the limit point. When the piston 14 is lowered, the first pipe 3 is pressurized, so that the measurement liquid 20 a in the measurement container 1 is returned to the raw material tank 20 via the second pipe 6. When the measurement liquid 20a is returned to the raw material tank 20, the extraction valve 8b is closed.
[0022]
Then, after a predetermined pause time, the drain valve 8a is opened, and then the cleaning valve 25 is opened, and the cleaning liquid is sprayed onto the tip of the sensor 2 to clean the tip of the sensor 2. . The cleaning liquid used for cleaning is discharged through the third pipe 7 because the drain valve 8a is in an open state. When the tip of the sensor 2 is cleaned, the air valve 26 is then opened, air is jetted onto the tip of the sensor 2, and the cleaned tip of the sensor 2 is dried. When the tip of the sensor 2 is dried by air, the drain valve 8a is closed, and the operation so far is repeated based on the signal of the trigger repeatedly. By switching the three-way valves 18 and 19, the measurement liquids 21a and 22a in the other raw material tanks 21 and 22 can be measured.
[0023]
As described above, according to this embodiment, the measurement liquid 20a can be automatically measured. Moreover, since the measured measurement liquid 20a is returned to the original, it can be measured even with the measurement liquid 20a that adversely affects the environment. Furthermore, the fact that the measurement container 1 and the like are in a closed system is useful for preventing the occurrence of secondary pollution. In addition, since the measuring container 1 or the like has a chemical-resistant structure made of glass or Teflon, even a highly corrosive measuring solution can be measured.
[0024]
FIG. 8 is a diagram showing a second embodiment of the present invention. In the second embodiment, the piston 33 of the suction compression cylinder portion 32 is configured to reciprocate by the air cylinder 34. In this air cylinder 34, another piston 36 provided at the end of the shaft 35 of the pinst 33 is provided. Then, pipes branched from the air blow pipe 24 are connected to the space partitioned by the separate piston 36 via plugs 37 and 38, respectively, and the air is partitioned by the separate piston 36. The operation similar to that of the motor of the first embodiment can be obtained by pumping to the spaces on both sides. According to the second embodiment, since the piston 33 of the suction compression cylinder portion 32 is moved using the air blow pipe 24, an electric motor is unnecessary, and the power consumption of the entire apparatus is reduced. Can be small.
[0025]
FIG. 9 is a diagram showing a third embodiment of the present invention. In the third embodiment, a compression spring 41 is built in the space on both sides partitioned by the piston 40 of the suction compression cylinder portion 39 to which the first pipe 3 is connected, and a plug 42 is connected to the other side. The air blow pipe 24 is branched and connected. According to the third embodiment, an electric motor is not required and only one plug 42 is required.
[0026]
FIG. 10 is a diagram showing a fourth embodiment of the present invention. In the fourth embodiment, as a “pressure reduction / pressurization means”, the suction side and the discharge side of the vacuum pump 43 are connected to the first pipe 3 via plugs 44 and 45, respectively. By doing so, the reduced pressure state and the pressurized state of the first pipe 3 can be obtained by switching the plugs 44 and 45. However, since the pressure reduction or pressurization limited according to the stroke of the piston is obtained as in the previous embodiment, it is not structured, so that the upper limit sensor 46 for suction and the lower limit for discharge are respectively provided in the measurement container 1. A sensor 47 is provided. Then, the vacuum pump 43 is stopped when the measurement liquid 20a reaches a predetermined liquid level during inhalation, and the vacuum pump 43 is stopped when the measurement liquid 20a is completely discharged during discharge. It is like that. According to the fourth embodiment, since a piston that requires a predetermined stroke is unnecessary, the apparatus can be reduced in size.
[0027]
【The invention's effect】
According to the first aspect of the present invention, the measurement liquid is automatically sucked into the measurement container through the second pipe by generating the reduced pressure state by the pressure reduction / pressurization means and opening the second pipe. Is done. Then, after measuring the inhaled measurement liquid with a sensor, if a pressurized state is generated by the pressure reduction / pressurization means, the measurement liquid in the measurement container is returned to the original state via the second pipe. And while cleaning the front-end | tip of a sensor with the washing | cleaning liquid supplied from 4th piping, the sensor after washing | cleaning can be dried with air. The cleaning liquid is also discharged from the third drain pipe. After washing and drying the sensor, the measurement liquid can be again sucked into the measurement container and the measurement liquid can be repeatedly detected.
[0028]
According to the invention described in claim 2, since the check valve is provided in the fourth pipe, it is possible to reliably prevent the measurement liquid from flowing back into the fourth pipe from the measurement container.
[0029]
According to the invention described in claim 3, since the pressure reducing / pressurizing means has a structure in which the piston is reciprocated in the cylinder to generate the pressure reducing and pressurizing, both the pressure reducing and the pressure are obtained with one structure. be able to.
[Brief description of the drawings]
FIG. 1 is a front view showing an automatic extraction device according to a first embodiment of the present invention.
FIG. 2 is a side view seen from the direction indicated by the arrow DA in FIG.
FIG. 3 is a side view seen from the direction indicated by the arrow DB in FIG.
4 is a plan view seen from the direction indicated by the arrow DC in FIG. 1. FIG.
FIG. 5 is a schematic view showing an apparatus according to the first embodiment.
FIG. 6 is a timing chart showing the operation of the first embodiment.
FIG. 7 is a cross-sectional view showing a check valve.
FIG. 8 is a schematic view showing a pressure reducing / pressurizing means according to a second embodiment of the present invention.
FIG. 9 is a schematic view showing a pressure reducing / pressurizing means according to a third embodiment of the present invention.
FIG. 10 is a schematic view showing a pressure reducing / pressurizing means according to a fourth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Measurement container 2 Sensor 3 1st piping 5 4th piping 6 2nd piping 7 3rd piping 8, 18, 19 Three-way valve 13, 32, 39, 43 Suction compression cylinder part (pressure reduction / pressurization means)
20a, 21a, 22a Measuring solution 27 Check valve 43 Vacuum pump (pressure reduction / pressurization means)

Claims (4)

A sensor is inserted into the sealed measurement container from the top, and a pressure reducing / pressurizing means is connected to the upper part of the measurement container via the first pipe, and a measurement solution for the measurement liquid is connected to the bottom of the measurement container via a three-way valve. Two pipes and a third pipe for drain are connected, a fourth pipe is connected to a position facing the sensor tip at the bottom of the measurement container, and cleaning liquid and air can be freely supplied to the fourth pipe. Extraction device. The automatic extraction device according to claim 1, wherein a check valve for preventing a flow from the measurement container is provided in the fourth pipe. 3. The automatic extraction device according to claim 1, wherein the pressure reducing / pressurizing means has a structure for generating pressure reduction and pressurization by reciprocating the piston in the cylinder. The automatic extraction device according to any one of claims 1 to 3, wherein the measurement container and the piping system are formed of a chemical resistant material.

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