JPH0539491Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a pressure defoaming type concentration measuring device for measuring the concentration of sludge.

[Conventional technology]

Conventionally, this type of sludge concentration measurement device consists of a sludge main pipe through which the sludge to be measured flows, a sludge concentration measurement chamber that branches from this sludge main pipe and communicates with the inside, and a pressurized sludge concentration measurement chamber that is installed in the sludge concentration measurement chamber. a movable partition element that partitions the chamber and can operate between the sludge main pipe side and the pressurizing chamber side; a concentration sensor provided on the sludge main pipe side of the movable partition element of the sludge concentration measurement chamber; and a sludge measurement chamber. It consists of an on-off valve installed on the side of the sludge main pipe from the concentration sensor in the chamber, and the on-off valve rotates 90 degrees to open the sludge concentration measurement chamber to the sludge main pipe and seal the sludge concentration measurement chamber. It is designed so that it can be switched to a closed position.

The above-mentioned conventional sludge concentration measuring device has a process of introducing sludge from the sludge main pipe into the sludge measurement chamber with the on-off valve in the open position, and after introducing the sludge, the on-off valve is closed and a movable partition element such as a diaphragm is moved with pressurized air. The process of applying pressure to eliminate (defoaming) the air bubbles contained in the sludge by responding to the pressure, the process of measuring the concentration of the sludge with a sensor after the pressurized defoaming, and the process of opening the on-off valve after measuring the concentration. The process of discharging sludge is repeated in sequence.

[Problem that the invention attempts to solve]

In the conventional concentration measuring device described above, when the flow velocity in the sludge main pipe is sufficiently high, the sludge flows into the sludge concentration measurement chamber when the on-off valve is in the open position, allowing for replacement, but when the flow velocity is low, the sludge flows into the sludge concentration measurement chamber. There was a problem in that the sludge was not introduced sufficiently and the sludge was not replaced sufficiently, making it impossible to sequentially measure the concentration of sludge flowing through the sludge main pipe.

This invention was made to solve this problem, and provides a highly reliable sludge concentration measuring device that can sufficiently exchange sludge by rotating the on-off valve in a predetermined direction. The purpose is to

[Means for solving the problem]

The sludge concentration measurement device of this invention rotates the on-off valve installed in the sludge concentration measurement chamber that branches from the sludge main pipe in the direction from the upstream side of the sludge main pipe to the downstream side, forcing the sludge in the sludge concentration measurement chamber. It was designed so that it could be replaced.

[Effect]

In this device, sludge is introduced into the sludge concentration measurement chamber from the sludge main pipe by rotating the on-off valve, and the sludge concentration is measured by rotating the on-off valve. The sludge in the room is replaced smoothly.

〔Example〕

An embodiment of this invention will be described below based on the drawings.

FIG. 1 is a sectional view of the first embodiment, and FIG. 2 is a sectional view of the second embodiment.

First, in FIG. 1, a sludge concentration measuring chamber 3 is connected to a sludge main pipe 1 through which sludge flows, and which branches out facing a protrusion 2 provided therein.

The sludge concentration measurement chamber 3 includes a cylindrical body 5 that communicates with the opening 4 of the sludge main pipe and extends outward, and a hemispherical outer box 6 that is removably fixed to the cylindrical body 5 by bolting or the like. This cylindrical body 5 is provided with a pair of sludge concentration sensors 7.

This sludge concentration sensor 7 consists of a pair of ultrasonic transmitters and their receivers facing each other, and the measurement reception signals are transmitted to a recording device or the like via a converter and processed.

Inside the cylindrical body 5, an on-off valve 8 is rotatably supported.

The on-off valve 8 introduces sludge into the sludge concentration measurement chamber 3 from the upstream side of the sludge main pipe 1, and controls the flow direction (sludge flow direction) in which the sludge in the sludge concentration measurement chamber flows out to the downstream side of the sludge main pipe 1. ) is configured to be rotationally driven by the valve driving means 15 only in one direction.

The valve driving means 15 is adapted to rotate intermittently so that the on-off valve 8 is rotated a plurality of times and then stopped at a closed position where the sludge is sealed in the sludge concentration measurement chamber 3. Therefore, the valve driving means 15 has a control function of continuously rotating the on-off valve 8 only in one direction in the sludge flow direction, and a control function that moves the on-off valve 8 between an open position and a closed position along the sludge flow direction. It has a control function for intermittent rotation drive depending on the valve position.

As the valve driving means 15, for example, a Geneva type having a Geneva gear or a rotation control device that controls the closed position may be adopted. In the case of the Geneva type valve driving means, the on-off valve 8 is moved intermittently by a predetermined angle, so that the closed position of the on-off valve 8 can be set accurately.

Further, a blade 8a is provided on the front surface of the rotation of the on-off valve 8 to promote replacement of sludge.

Furthermore, a repair gate 9 is provided on the outside of the sludge main pipe 1 to open and close the opening 4 of the main pipe 1 while keeping the opening 4 in a sealed state with the cylindrical body 5.

By closing this repair gate 9, the sludge concentration sensor 7, diaphragm 10, etc. can be removed.
These repairs etc. can be easily performed.

A sludge concentration sensor 7 is provided inside the sludge concentration measurement chamber 3. A movable partition element 10 is provided at the outer end.

In this first embodiment, the movable partition element 10 is fastened together with the outer box 6 to separate the sludge concentration measurement chamber 3 and the outer box 6.
It is made up of a diaphragm that partitions the inside of the outer box 6 into a pressurizing chamber 11.

A leak detector 13 is provided in the pressurizing chamber 11, and pressurized air is supplied and discharged from a supply/discharge control means (not shown) through a supply/exhaust port 12 provided in the outer box 6. Normally, pressurized air from an air compressor is introduced, and the pressurized air in the room is released to the atmosphere.

Next, the operation of the first embodiment will be explained. When the on-off valve 8 rotates, sludge from the upstream side of the sludge main pipe 1 flows through the sludge measurement chamber 3 and toward the downstream side of the sludge main pipe 1 as shown by the arrow.
The diaphragm 10 is in a state of being deformed toward the pressurizing chamber 11 due to the internal pressure of the sludge main pipe 1.

When the sludge in the room is replaced by multiple consecutive rotations of the on-off valve 8 in one direction along the sludge flow direction, the on-off valve 8 moves the valve driving means 1 to the closed position shown by the solid line.
The rotational displacement is stopped at 5.

As a result, the on-off valve 8 is closed and the sludge is sealed in the sludge concentration measurement chamber 3.

In this state, pressurized air is supplied into the pressurizing chamber 11, whereby the sludge in the sludge concentration measuring chamber 3 is defoamed under pressure through the diaphragm 10, and the sludge concentration in that state is measured by the sensor 7. Ru. After the measurement, the pressurizing chamber 11 is opened to the atmosphere, and the on-off valve 8 is rotated to replace the sludge.

Next, FIG. 2 shows a second embodiment, in which, in addition to the rotational drive of the valve, the forced movement of the movable partition element promotes the exchange of sludge. In this embodiment, the movable partition element 10 is slidably fitted into the sludge concentration measurement chamber 3 and surrounded by an O-ring 2.
4, and a bellows 25 having one end connected to the piston 23 and the other end connected to the sludge main pipe 1 side in the sludge concentration measurement chamber 3.

Therefore, the bellows 25 expands and contracts as the piston 23 moves, and when the bellows 25 expands and contracts, the sludge main pipe 1
It generates suction force for the sludge flowing inside, and conversely generates pressurizing force during shortening operation.

In this case, when suctioning sludge, the piston 23
Bellows 2 does not require much force to move.
5 should be reinforced to prevent it from denting inward. For example, by attaching a reinforcing ring 26 to the bellows 25, it is possible to prevent the bellows 25 from denting inward.

On the other hand, the inside of the sludge concentration measurement chamber 3 has an open hole 27 that communicates with a sealed opening formed between the inner circumferential wall and the bellows 25, and an air hole 28 that opens on the piston side.

The air hole 28 is provided with a moving means 29 for moving the piston 23.

The moving means 29 of this embodiment is composed of an air compressor that reciprocates the piston 23 by selectively supplying pressurized air to the air hole 28 and the open hole 27. A means using an actuating motor or the like, a means using hydraulic pressure, or a means using an air cylinder may be used.

The rest of the structure in this second embodiment is the same as that in the first embodiment, so the same parts are given the same reference numerals and the explanation will be omitted.

Next, the operation of the second embodiment will be explained. When the on-off valve 8 is rotated and pressurized air from the moving means 29 is introduced into the open hole 27 in this state, the bellows 25 is pulled by moving the piston 23.

Sludge is forcibly introduced into the sludge concentration measurement chamber 3 from the sludge main pipe 1 by the suction action at this time. Then, the on-off valve 8 is closed, thereby completing the sludge introduction process.

Then, the pressurized air introduced from the air hole 28 acts on the piston 23 and the piston 23 is pushed, thereby pressurizing the sludge and eliminating the bubbles contained therein. Then, the concentration of the sludge is measured by the sensor 10 in a bubble-free state.

After the measurement, the on-off valve 8 is opened, the piston 23 is moved by pressurized air from the air hole 28, and the sludge is discharged.

[Effect of idea]

As described above, according to this invention, when the sludge to be measured flows into the sludge concentration measurement chamber from the upstream side of the sludge main pipe, the on-off valve that opens and closes the sludge concentration measurement chamber with respect to the sludge main pipe is connected to the sludge main pipe. Since the rotation is driven only in one direction, that is, the direction of flow of sludge flowing out to the downstream side of By switching the on-off valve, the sludge introduced into the sludge concentration measurement chamber will not be pushed back, and on the contrary, by switching the on-off valve in only one direction in the sludge flow direction, the sludge will not be pushed back into the sludge concentration measurement chamber. It is possible to obtain the effect of agitating the sludge to be measured.
The replacement of the sludge to be measured with respect to the sludge concentration measurement chamber can be facilitated, which has the effect of improving the measurement accuracy of sludge concentration.

Further, the on-off valve is selectively driven to continuously rotate only in one direction in the sludge flow direction, and to be rotated intermittently to the open position and the closed position along the sludge flow direction. For example, even if the sludge to be measured has a high stickiness such as sewage sludge and is likely to be insufficiently replaced in the sludge concentration measurement chamber, the sludge can be removed by continuously rotating the on-off valve in the sludge flow direction. The concentration measurement chamber can be replaced smoothly and reliably, and the desired purpose can be easily achieved without using complicated and expensive methods such as installing a special pump etc. to replace the sludge. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the first embodiment of this invention;
FIG. 2 is a sectional view showing a second embodiment. In the figure, 1 is a sludge main pipe, 3 is a sludge concentration measuring chamber, 7 is a concentration sensor, 8 is an on-off valve, 10 is a movable partition element, 11 is a pressurizing chamber, and 15 is a driving means.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A sludge main pipe through which the sludge to be measured flows, a sludge concentration measurement chamber that branches off from this sludge main pipe and communicates with the inside thereof, and a sludge concentration measurement chamber installed in this sludge concentration measurement chamber. a movable partition element that partitions a pressure chamber and is operable between the pressure chamber side and the sludge main pipe side; and a movable partition element that is provided in the sludge concentration measurement chamber and is located closer to the sludge main pipe side than the movable partition element. In the sludge concentration measuring device comprising a sensor and an on-off valve provided in the sludge concentration measurement chamber and located on the sludge main pipe side from the concentration sensor, the sludge to be measured is passed from the upstream side of the sludge main pipe to the sludge main pipe. A valve driving means for rotationally driving the opening/closing valve only in one direction in the flow direction of the sludge introduced into the concentration measurement chamber and sent to the downstream side of the sludge main pipe, the valve driving means comprising:
A control function that continuously rotates the on-off valve only in one direction in the sludge flow direction, and a control function that intermittently rotates the on-off valve between an open position and a closed position along the sludge flow direction. A sludge concentration measuring device comprising: selectively driving the on-off valve continuously in one direction and intermittently driving the on-off valve in the open position and in the closed position. (2) A utility model registration characterized in that the free end side of the opening/closing valve is integrally provided with a blade that protrudes forward in the rotational direction along the sludge flow direction to promote sludge replacement. A sludge concentration measuring device according to claim 1.