JPH08170956A - Fluid ammeter - Google Patents

Abstract

PURPOSE: To make a shape small for reducing the amount of use of fluid to be measured and at the same time reduce washing time by directly supplying the fluid to be measured to the inside of a cylindrical container via a supply pipe and at the same time directly discharging the fluid from the inside to the outside of the cylindrical container. CONSTITUTION: When fluid to be measured is supplied in the direction of arrows A1 and A2 via a supply pipe 11A, a required amount of fluid to be measured for measuring the current of the fluid is accumulated in a cylindrical container 11. When the fluid to be measured is excessively supplied, it overflows from the container 11 and runs via a delivery pipe 11B in the direction of arrows A5 and A6. A washing medium or different kinds of fluids to be measured in the container 11 is unloaded from the container 11 and the inside of the container 11 is substituted for a few fluid to be measured. In this state, by moving a piston 14 in the direction of an arrow B by a drive device 13 in two ways, the fluid to be measured flows in the direction of arrows A3 and A4 inside the container 11 and current is generated between electrodes 12A and 12B and is outputted as fluid current.

Description

Detailed Description of the Invention

[0001]

[Object of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow in which a fluid to be measured supplied to the inside of a cylindrical container is caused to flow by a piston, and the generated flowing current is measured by a pair of electrodes formed inside the cylindrical container. Regarding the ammeter.

[0003]

2. Description of the Related Art Conventionally, this type of flow ammeter accommodates a cylindrical container in an inner space of an outer container and forms an opening in a side wall of the cylindrical container to supply a fluid to be measured to the inner space of the outer container. Thus, the fluid to be measured is supplied to the inside of the cylindrical container through the opening of the cylindrical container. Further, in this flow ammeter, a supply pipe is opened to the bottom of the cylindrical container, and a cleaning medium is directly supplied to the inside of the cylindrical container at the time of cleaning (Japanese Patent Application Laid-Open No. 60-1985). 17075
7).

[0004]

[Problems to be Solved] However, in the conventional flowing ammeter, since the cylindrical container is accommodated in the inner space of the outer container, the shape becomes large, and the amount of the fluid to be measured increases. There was a problem. At the same time, the amount of the cleaning medium used also increases, and there is a problem in that the cleaning operation requires a great deal of time.

The present invention has been made in view of the above problems, and has as its object to reduce the size of a shape, reduce the amount of fluid to be measured, and reduce the time required for a cleaning operation and the amount of cleaning medium used. It is to provide a flow ammeter which can be reduced.

[0006]

Configuration of the Invention

[0007]

A flow ammeter according to the present invention comprises a cylindrical container for holding a fluid to be measured therein, and a pair of electrodes disposed in the cylindrical container so as to be spaced apart from each other in the longitudinal direction thereof. And a piston that reciprocates in its length direction inside the cylindrical container to generate a flowing current between the pair of electrodes by causing a fluid to be measured to flow, and a measurement of the flowing current of the cylindrical container. One end is directly attached to a position that does not affect the result, a supply pipe that supplies the fluid to be measured to the inside of the cylindrical container, and a position that does not affect the measurement result of the flowing current of the cylindrical container. One end is directly attached to the discharge pipe for discharging the fluid to be measured from the inside of the cylindrical container to the outside, and one end is directly attached to the cylindrical container, and the cleaning medium is supplied to the inside of the cylindrical container. Cleaning medium supply And a flop.

[0008]

In this flow ammeter, the fluid to be measured is directly supplied to the inside of the cylindrical container via the supply pipe, and is directly discharged from the inside of the cylindrical container to the outside via the discharge pipe. As a result, a new fluid to be measured supplied from the supply pipe is held inside the cylindrical container in place of the cleaning medium or the fluid to be measured differently. The fluid to be measured is caused to flow along the length of the cylindrical container by the reciprocation of the piston, and a flowing current corresponding to the fluid to be measured is generated between the pair of electrodes.

In the cleaning, the cleaning medium is directly supplied to the inside of the cylindrical container through the cleaning medium supply pipe, and is directly discharged from the inside of the cylindrical container to the outside through the discharge pipe. As a result, the fluid to be measured inside the cylindrical container is replaced with the cleaning medium, and the inside of the cylindrical container is cleaned.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an entire configuration of a flowing ammeter 10 according to one embodiment of the present invention.

This flow ammeter 10 is supplied with a fluid to be measured via a supply pipe 11A and discharges it while overflowing the fluid to be measured via a discharge pipe 11B so as to maintain the measurement accuracy of the flowing current. A cylindrical container 11 for holding a predetermined amount of the fluid to be measured necessary for the measurement, two electrodes 12A and 12B provided on the inner peripheral surface of the cylindrical container 11, and the inside of the cylindrical container 11. And a piston 14 driven by a drive device 13 arranged outside the cylindrical container 11.

The electrodes 12A and 12B are arranged at appropriate intervals in the lengthwise direction of the cylindrical container 11. In this embodiment, one electrode 12B is arranged near the bottom of the cylindrical container 11.
The other electrode 12A is arranged near the middle position of the cylindrical container 11. The electrodes 12A and 12B are embedded in the cylindrical container 11 so as not to obstruct the flow of the fluid to be measured, and at least a part of the electrodes 12A and 12B face the inner peripheral surface of the cylindrical container 11 so that the fluid to be measured is not obstructed. It is immersed in.

The piston 14 receives the driving force of the driving device 13 via the rod 13a and reciprocates in the longitudinal direction of the cylindrical container 11 to forcibly flow the fluid to be measured between the electrodes 12A and 12B. Therefore, a flowing current is generated between the electrodes 12A and 12B.

An ammeter 15 is connected to the electrodes 12A and 12B via connection lines 15a and 15b. The ammeter 15 is connected to the electrode 12 by the flow of the fluid to be measured as the piston 14 reciprocates.
The current generated between A and 12B is measured, amplified as appropriate, and output as a flowing current.

The supply pipe 11A and the discharge pipe 11B are
Each is opened at a position where the movement of the fluid to be measured from the supply pipe 11A to the discharge pipe 11B does not affect the measurement result of the flowing current measured by the ammeter 15. In this embodiment, the opening is provided at a position higher than the positions where the electrodes 12A and 12B are provided so that the flow of the measured fluid can be measured without stopping the supply of the fluid to be measured by the supply pipe 11A even when measuring the flowing current. If the supply of the fluid to be measured by the supply pipe 11A is stopped when measuring the flowing current, the supply pipe
The mounting positions of 11A and the discharge pipe 11B can be arbitrarily determined.

The flow ammeter 10 has one end opened at an appropriate position of the cylindrical container 11, that is, at a position where the cleaning medium is easily supplied to the electrodes 12A and 12B (the bottom surface in this embodiment). A cleaning medium supply pipe 16 for supplying (for example, fresh water, an acid, or a base) and an on-off valve 17 for interrupting the supply of the cleaning medium by the cleaning medium supply pipe 16 are provided. The on-off valve 17 may be opened and closed manually or may be opened and closed by remote control. During the period when the on-off valve 17 is open, the amount of the cleaning medium used and the time required for the cleaning operation can be reduced.
Preferably, the supply of the fluid to be measured by 11A is stopped.

Next, the operation of the streaming ammeter 10 according to this embodiment will be described.

Measurement of flowing current

When the fluid to be measured is supplied through the supply pipe 11A as shown by arrows A1 and A2, the cylindrical container 11
An amount of the fluid to be measured required for measuring the flowing current is accumulated.

When the fluid to be measured is excessively supplied, the discharge pipe 11B is discharged from the cylindrical container 11 as shown by arrows A5 and A6.
It is discharged while overflowing through. Along with this, the cleaning medium or the different type of fluid to be measured remaining in the cylindrical container 11 is discharged from the cylindrical container 11, and as a result, the cylindrical container
The inside of 11 is replaced with a new fluid to be measured. When the supply of the fluid to be measured by the supply pipe 11A is stopped when measuring the flowing current, the fluid to be measured is washed until the cleaning medium remaining in the cylindrical container 11 or a fluid to be measured of a different type is sufficiently replaced. Is preferably supplied continuously.

When the piston 14 is reciprocated by the driving device 13 as shown by the arrow B in a state where the cleaning medium or the different kinds of fluid to be measured remaining in the cylindrical container 11 are sufficiently replaced, the measured The fluid flows through the arrow A inside the cylindrical container 11.
As shown by 3, A4, it becomes fluid. Accordingly, a current is generated between the electrodes 12A and 12B.

The current generated between the electrodes 12A and 12B is measured by an ammeter.
After being measured at 15 and appropriately amplified, it is output as a flowing current to the subsequent device.

Cleaning of the cylindrical container 11

When the measuring operation of the flowing current is performed for a predetermined time or a predetermined number of times, the supply of the fluid to be measured via the supply pipe 11A is stopped, and the on-off valve 17 is opened. Along with this, the cleaning medium is supplied into the cylindrical container 11 through the cleaning medium supply pipe 16 as shown by arrows C1 and C2.

As the cleaning medium is supplied, the fluid to be measured remaining inside the cylindrical container 11 overflows through the discharge pipe 11B as shown by arrows C4 and C5, while overflowing the cylindrical container 11.
Is discharged to the outside. As a result, the inside of the cylindrical container 11 is filled with the cleaning medium, replacing the fluid to be measured.

At this time, the driving device 13 controls the piston 14
Is reciprocated as shown by arrow B,
As shown by the arrow C3, it flows inside the cylindrical container 11 and contacts the electrodes 12A, 12B or the inner peripheral surface of the cylindrical container 11. As a result, foreign matter adhered to the electrodes 12A, 12B or the inner peripheral surface of the cylindrical container 11 is peeled off. Foreign matter that has peeled off from the electrodes 12A, 12B or the inner peripheral surface of the cylindrical container 11 is discharged to the discharge pipe 11 when the cleaning medium is continuously supplied to the cylindrical container 11.
It is immediately discharged to the outside of the cylindrical container 11 via B.

At a time when the washing operation of the cylindrical container 11 has sufficiently proceeded, the on-off valve 17 is closed, and the supply pipe is again turned on.
The measured fluid starts to be supplied via 11A.

After the time when the cleaning medium is sufficiently replaced by the fluid to be measured from the cylindrical container 11, the operation of measuring the flowing current is executed again.

As described above, in the flowing ammeter 10 of the present embodiment, the one end of the supply pipe 11A and the one end of the discharge pipe 11B are positioned with respect to the cylindrical container 11 so as not to affect the measurement result of the flowing current. And the one end of the cleaning medium supply pipe 16 is also directly attached to the cylindrical container 11, so that the outer container can be removed from the flow ammeter 10. Therefore, the shape of the flowing ammeter 10 can be reduced in size, and the amount of fluid to be measured can be reduced. At the same time, since the shape of the streaming ammeter 10 can be downsized, the amount of cleaning medium used can be reduced, and
The time required for the cleaning operation can be reduced, and the operation of measuring the flowing current can be made more efficient.

Further, with respect to the flowing ammeter 10 of this embodiment,
A specific numerical value will be described below.

First, the flowing ammeter 10 of the present embodiment
After the measuring operation of the flowing current of the fluid to be measured was performed for 7 hours, the supply of the fluid to be measured was stopped and tap water as a cleaning medium was supplied to perform the cleaning operation.

At this time, as the fluid to be measured, mixed raw sludge (pH 5.8, SS19 g / liter, V
A separation liquid obtained by adding a cationic polymer (specifically, Ebagrose C104G manufactured by Ebara Infilco Co., Ltd.) to SS75%) and dehydrating with a belt press was adopted.

The amount of the cationic polymer added was adjusted so that the flowing current measured by the flowing current meter 10 of this embodiment was 0.

As shown in FIG. 2, the flow current measured in the cleaning operation by the flow ammeter 10 of this embodiment showed a constant value about 1 minute after the start of the cleaning.

On the other hand, in a conventional flow ammeter, a cylindrical container is housed in an inner space of an outer container, and a fluid to be measured is not directly supplied to the inside of the cylindrical container.
What was supplied through the opening formed in the cylindrical container after being supplied to the internal space of the outer container was prepared. Other than that, it had the same configuration as the flowing ammeter of this example.

With this conventional flow ammeter, the measuring operation of the flowing current of the fluid to be measured is performed for 7 hours, and then the supply of the fluid to be measured is stopped and tap water as a cleaning medium is supplied to thereby perform cleaning. Performed the action.

Here, as the fluid to be measured, mixed raw sludge (pH 5.8, SS 19 g / liter, VSS 75%) discharged from the municipal wastewater treatment plant was used as in the case of the flow ammeter 10 of this embodiment. On the other hand, a separation liquid obtained by adding a cationic polymer (specifically, Ebagrose C104G manufactured by EBARA Infilco) and dehydrating with a belt press was adopted.

The amount of the cationic polymer added was adjusted so that the flowing current measured by a conventional flowing ammeter was zero.

As shown in FIG. 2, the measurement result of the flowing current in the cleaning operation by the conventional flowing ammeter showed a constant value about 15 minutes after the start of the cleaning.

The invention of the present application is not limited to the above-described embodiment, but includes, for example, the case where an ultrasonic cleaning device is provided alongside the cylindrical container 11. In this case, the ultrasonic cleaning device may be attached to the cylindrical container 11 or the supply pipe 11A.

[0042]

As is apparent from the above description, according to the flow ammeter of the present invention, one end of the supply pipe and one end of the discharge pipe are positioned with respect to the cylindrical container so as not to affect the measurement result of the flow current. And the one end of the cleaning medium supply pipe is also directly attached to the cylindrical container, eliminating the need for a conventional outer container, thus reducing the size and reducing the amount of fluid to be measured. can do. At the same time, the use of the cleaning medium can be reduced, and the time required for the cleaning operation can be reduced, so that the operation of measuring the flowing current can be made more efficient.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a flowing ammeter according to the present invention.

FIG. 2 is a graph showing the results of a comparative experiment between the streaming ammeter of the embodiment shown in FIG. 1 and a conventional streaming ammeter.

[Explanation of symbols]

 10 Flow ammeter 11 Cylindrical container 11A Supply pipe 11B Discharge pipe 12A, 12B Electrode 14 Piston 15 Ammeter 16 Cleaning medium supply pipe

Claims (1)

[Claims] 1. A cylindrical container for holding a fluid to be measured therein, a pair of electrodes disposed in the cylindrical container so as to be spaced apart from each other in a length direction thereof, and inside the cylindrical container, A piston that reciprocates in its length direction and generates a flowing current between the pair of electrodes by causing the fluid to be measured to flow, and one end at a position that does not affect the measurement result of the flowing current of the cylindrical container Is directly attached, a supply pipe for supplying the fluid to be measured to the inside of the cylindrical container, and one end is directly attached to a position that does not affect the measurement result of the flowing current of the cylindrical container, A discharge pipe that discharges a fluid from the inside of the cylindrical container to the outside, and a cleaning medium supply pipe that has one end directly attached to the cylindrical container and supplies a cleaning medium to the inside of the cylindrical container. Characterized by Dynamic ammeter.