JP3249304B2 - Flow measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate measuring device for measuring a flow rate of a fluid such as sewage or rainwater flowing in a sewer or open channel, and particularly to a high precision measurement of a fluid flow rate from a small flow rate to a large flow rate. The present invention relates to a flow measurement device that can be used.

[0002]

2. Description of the Related Art Conventionally, as a method of measuring the flow rate of a fluid such as sewage or rainwater flowing through a sewer or open channel, for example, FIG.
0, as shown in FIG. 11 (a) and FIG. 11 (b), a measurement method using a flowmeter 11 and a level meter in combination called a perma bolus flume (hereinafter referred to as PBF). A measurement method using both the meter 12 and the flow meter 11 is common. In FIG. 11, 13 indicates an installation pit, and 14 indicates a pipeline.

[0003] Here, the PBF is a system in which a water stop plate is provided in a sewer or open channel, and a fluid such as sewage or rainwater flows into the PBF main body. The PBF main body has the same shape as a kind of weir type flow meter. In this method, the flow velocity and level of a fluid when passing through a throttle portion of the PBF main body are measured, and the flow rate is measured.

However, in such a measuring method using the current meter 11 and the level meter together, the sensor used for measuring the flow velocity and the water level is an ultrasonic wave. In this method, the flow rate of the fluid is measured with high accuracy. It is difficult to do.

[0005] Also, it is difficult to measure the flow rate of the fluid with high accuracy also in the measuring method using the ultrasonic level meter 12 and the flow meter 11 together. The reason for these difficulties is that ultrasonic waves are used in the measurement method, so there is a difficulty in measuring the fluid level and flow velocity with high accuracy in principle, and the measurement of fluids such as sewage and rainwater with high accuracy It is impossible to do it. In particular, suspended matter flows in sewage and rainwater, air bubbles are mixed in, and there are many problems in measurement due to many conditions that block ultrasonic waves, and problems in the measurement surface as original ultrasonic waves are taken into consideration. However, at present, there is a limit in measuring with high accuracy.

However, in order to measure the current flow rate of sewage and rainwater, it is necessary to install the pipe in a sewer or open channel in the pit. In addition, the diameter of the entrance and exit of a manhole is generally 600 mm, and in a flowmeter having an integral structure,
In order to install a flowmeter having the same diameter as that of the PBF, there is a problem that the manhole cannot be passed through because the external dimensions are large.

[0007] Therefore, since PBF can be decomposed,
When passing through an entrance with a manhole diameter of 600 mm, it is made finer, and it is assembled in the pit after passing through the manhole, and there is a great merit that it is possible to install a sensor for a sewer or opening of a manhole larger than 600 mm in diameter of the manhole. .

Therefore, in order to measure the flow rate of a fluid such as sewage or rainwater flowing through a sewer or open channel, a flow meter for measurement is attached to a pit provided in the middle of the sewer or open channel. It is customary. In addition, manholes are used to enter and exit the pit.

Therefore, the size of the manhole is generally standardized, and the hole gauge is usually 600 mm.
Further, there is a special type having a diameter of 900 mm. It is difficult to install an integrated flow meter that measures the flow rate of sewage and rainwater unless it is large enough to enter and exit the manhole. However, this does not apply to new construction, but the number of newly constructed pits is limited in countries where sewage facilities are widespread. PBFs and the like that can be used up until now because they can enter and exit through the manhole are disassembled as described above and reassembled after passing through the pit from the manhole.

However, as described above, the flow rate measurement accuracy is poor and unsatisfactory. In recent years, electromagnetic flowmeters for measuring the flow rate of sewers and rainwater in sewers and open drains have begun to be developed, but the size of the manhole as described above remains a problem. That is,
The mainstream of sewers and open drains is over 1000 mm on the main line, so even if an electromagnetic flow meter is manufactured in a size that matches the size of the sewer or open drain, it will not enter through manholes. Is a big problem. In particular, the integral type flow meter is a flow meter using an electromagnetic method, and it is common to form the inside of a measuring pipe in a cylindrical shape with an insulating material or the like and to guide and measure the flow rate, but it is a product that cannot be disassembled. On the other hand, the measurement accuracy is
We know that it is several steps better than the above PBF,
I am struggling with the above problem.

Therefore, in order to solve these problems,
An electromagnetic flowmeter of a size that can enter and exit the manhole,
It is conceivable to attach it to a sewer or open channel together with a waterproof plate. However, depending on the flow rate of sewage and rainwater, a flowmeter large enough to pass through a manhole will have a small full scale value, so that the flow rate will exceed the full scale, leaving a practical problem. . As a result, it is difficult to measure the flow rate of a fluid such as sewage or rainwater from a small flow rate to a large flow rate.

[0012]

As described above, in the conventional flow rate measuring method, the flow rate of a fluid such as sewage or rainwater flowing through a sewer or open channel is measured with high accuracy from a small flow rate to a large flow rate. There was a problem that it was difficult.

An object of the present invention is to provide an extremely reliable flow rate measuring device capable of measuring the flow rate of a fluid such as sewage or rainwater flowing through a sewer or open channel from a small flow rate to a large flow rate with high accuracy. Is to do.

[0014]

As described above, in the conventional flow rate measuring method, the flow rate of a fluid such as sewage or rainwater flowing through a sewer or open channel is measured with high accuracy from a small flow rate to a large flow rate. There was a problem that it was difficult.

An object of the present invention is to provide an extremely reliable flow rate measuring apparatus capable of measuring the flow rate of a fluid such as sewage or rainwater flowing in a sewer or open channel from a small flow rate to a large flow rate with high accuracy. Is to do.

[0016]

In order to achieve the above object, a flow rate measuring apparatus for measuring a flow rate of a fluid such as sewage or rainwater flowing through a sewer or open channel is firstly described. In the sewer or open channel, a water stop plate having an outer shape matching the shape of the sewer or open line is provided, and a hole through which fluid can be introduced and a flow meter can be attached is provided in the water stop plate. A plurality of flow meters are provided in the vertical direction, and a flow meter is attached to each of the holes to introduce a fluid into each of the flow meters.

Further, in the invention corresponding to claim 2, the heights of the respective holes are intersected with each other.

[0018]

In the invention corresponding to claim 3, a water stop plate having an outer shape corresponding to the shape of the sewer or open drain is provided in the sewer or open drain, and fluid is introduced into the water stop plate. In addition, a plurality of flow meter holes to which a flow meter can be attached are provided in a plurality of positions in the vertical direction, and a hole having substantially the same inner diameter as the inner diameter of the flow meter hole is formed in each of the water blocking plates from each flow meter hole. It is provided at a position deviated in the horizontal direction, a flow meter is attached to each flow meter hole, and a fluid is introduced into each flow meter.

Here, in the invention according to claim 4, for each of the flow meter and the hole provided at the same height in the water blocking plate according to claim 3, the value indicated by the flow meter and the value of the hole are determined. The actual flow rate is obtained by calculating the flow rate value at the height by multiplying the number by the value obtained by adding the number of the flow meter holes, and adding the flow rate values calculated for each of the same heights to each other. And one converter that calculates and outputs the flow rate.

According to a fifth aspect of the present invention, there is provided a water blocking plate corresponding to any one of the first to fourth aspects, wherein a fluid discharge hole is provided, and a lid member for zero adjustment of static water of the flow meter is provided. The lid member of the flow meter is detachably attached to the fluid discharge hole.

[0022]

Therefore, first, in the flow rate measuring apparatus according to the first aspect of the present invention, a water stop plate is provided in a sewer or open channel, and a plurality of holes are provided in the water stop plate in a vertical direction. By attaching a flow meter to the hole to guide fluid such as sewage and rainwater to the inside of the flow meter, the fluid flow is limited only when the flow rate of the fluid is low, that is, only in the lower hole provided in the water stop plate. Does not flow, only the indication of the lower flow meter is output as it is, and when the flow rate of the fluid increases, that is, when the fluid flows through the lower and upper holes provided in the water stoppage plate The sum of the lower flow meter indication and the upper flow meter indication is calculated and output so as to be the actual flow rate, and the flow rate of the fluid can be measured with high accuracy from a small flow rate to a large flow rate.

Further, the flow rate of the fluid can be changed from a small flow rate to a large flow rate by intersecting the heights of the holes with each other as in the flow rate measuring device according to the second aspect of the present invention. Can be measured continuously.

According to a third aspect of the present invention, there is provided a flow rate measuring device, wherein a water stop plate having an outer shape conforming to the shape of the sewer or open channel is provided on the sewer or open channel. In the water stop plate, a plurality of flow meter holes into which a fluid can be introduced and a flow meter can be attached are provided in the vertical direction, and the water stop plate has a hole having an inner diameter substantially equal to the inner diameter of the flow meter hole. Is provided at a position horizontally displaced from each flow meter hole, a flow meter is attached to each flow meter hole, and a fluid is introduced into each flow meter. When the flow rate is small, that is, when the fluid flows only through the lower hole provided in the water stop plate, only the indication of the lower flow meter is output as it is, and when the flow rate of the fluid increases, When fluid flows into the lower and upper holes provided in the water stoppage plate For each of the flowmeters and holes provided at the same height above and below, multiply the indicated value by the flowmeter and the value obtained by adding the number of holes for the flowmeter to the number of holes for the flowmeter. And the flow rate value at the lower side is calculated, and the sum of the flow rate values calculated for each of the same heights is calculated and output so that the actual flow rate is obtained. And the flow rate can be measured only by providing flow meters one by one along the vertical direction, so that the configuration can be simplified.

According to a fifth aspect of the present invention, there is provided a water stop plate according to any one of the first to fourth aspects, wherein a fluid discharge hole is provided, and a lid member for zero adjustment of static water of the flow meter is provided. Since it is detachably attached to the fluid discharge hole, in addition to the effects achieved in the corresponding claims of claims 1 to 4, the lid member is removed from the fluid discharge hole at the time of zero water adjustment. By attaching to the flow meter, even if the flow meter is covered, the fluid flows from the fluid discharge hole, so it does not stop the flow of the fluid, prevents overflow due to an increase in water level, and provides safety during zero water adjustment. Can be secured.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, for example, a hole for a flow meter large enough to pass through an existing manhole is formed in a water stop plate having an outer shape corresponding to the shape of a sewer or open channel, and the maximum flow rate value in the vertical direction. And a flow meter is attached to each of the holes, and a fluid such as sewage or rainwater is introduced into each flow meter.

Here, since the number of holes is adjusted to the maximum flow rate of fluid such as sewage or rainwater flowing through a sewer or open channel, the above-mentioned problem can be solved by installing a flow meter of the same size. become.

Further, the water stop plate is provided with a hole for mounting a flow meter in a vertical direction, so that when the flow rate of a fluid such as sewage or rainwater is small, the flow rate is measured only by the lower flow meter. However, when the flow rate of the fluid increases, the lower hole is filled with the fluid and also flows to the upper hole, and the instructions of the lower and upper flow meters are added. By measuring the flow rate, the flow rate of the fluid can be continuously measured with high accuracy from a small flow rate to a large flow rate.

Hereinafter, embodiments of the present invention based on the above-described concept will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a flow measuring device according to a first embodiment of the present invention.

That is, as shown in FIG. 1, the flow rate measuring device according to the present embodiment has a water stop plate having an outer shape conforming to the shape of the sewer 1 or the open sewer 2 on the sewer 1 or the open sewer 2. 3 and
A plurality of holes (5 in this example) are provided in the water stop plate 3 in a vertical direction for introducing a fluid such as sewage or rainwater flowing through the sewer 1 or the open culvert 2 and for mounting a flow meter. Furthermore, a small-diameter, high-precision integrated electromagnetic flow meter 4a to 4e capable of passing an existing manhole into each of these holes.
Are respectively attached so as to introduce a fluid into each of the integrated electromagnetic flow meters 4a to 4e.

Each of the integral electromagnetic flow meters 4a to 4
One converter (not shown) for calculating and outputting the flow rate so that the value obtained by adding the instruction of e is the actual flow rate is provided.
Further, the heights of the above-mentioned holes are made to intersect with each other.

Next, the operation of the flow rate measuring device of the present embodiment configured as described above will be described. In FIG. 1, when the flow rate of the fluid such as sewage or rainwater flowing through the sewer 1 or the open culvert 2 is small, that is, when the fluid flows only through the lower hole provided in the water stop plate 3, Only the indication of the integrated electromagnetic flow meter 4a is calculated and output as the actual flow rate by a converter (not shown).

When the flow rate of the fluid such as sewage or rainwater flowing through the sewer 1 or the open channel 2 increases, that is, when the fluid flows into the lower and upper holes provided in the water stop plate 3. , The sum of the indication of the lower integrated electromagnetic flow meter 4a and the indication of the upper integrated electromagnetic flow meter 4b to 4e,
The output is calculated by a converter (not shown) so that the actual flow rate is obtained.

Accordingly, the flow rate of the fluid can be measured from a small flow rate to a large flow rate with high accuracy. In this case, since the heights of the holes are intersected with each other, the flow rate of the fluid can be continuously measured from a small flow rate to a large flow rate.

The integrated electromagnetic flow meter 4a includes:
It is necessary to provide a flow meter capable of measuring even if the fluid flows only in a part of the lower hole, and to be able to measure even if the fluid flows through the entire lower hole. Therefore, when the flow rate is such that the flow rate is from the lower side to the upper hole, when the upper integrated electromagnetic flow meters 4b to 4e output the flow rate signals, the flow rates of the two flow meters 4a, 4b to 4e are reduced. Instructions are added.

As described above, in the flow rate measuring device of the present embodiment, a water stop plate 3 having an outer shape matching the shape of the sewer 1 or the open sewer 2 is provided on the sewer 1 or the open sewer 2. This water stop plate 3
In addition, five fluid holes such as sewage and rainwater that flow through the sewer 1 and the open sewer 2 are installed in the vertical direction, and five flow holes can be attached to the flow meter, and the existing manholes are passed through these holes. Small-diameter, high-precision integrated electromagnetic flowmeter 4
a to 4e are respectively attached, and the fluid is introduced into each of the integrated electromagnetic flow meters 4, and the sum of the indications of the integrated electromagnetic flow meters 4a to 4e is the actual flow rate. Thus, a single converter for calculating and outputting the flow rate is provided, and the heights of the respective holes are interlaced with each other.

Accordingly, when the flow rate of the fluid such as sewage or rainwater flowing through the sewer 1 or the open culvert 2 is a small flow rate, the integrated electromagnetic flow meter having the flow value flowing through the lower hole portion attached to the lower hole portion. 4a only, and when the flow rate is a large flow rate, each of the integrated electromagnetic flowmeters 4a to 4 attached to the lower and upper holes, respectively.
It is possible to measure the flow rate of the fluid with high accuracy by performing measurement together with e.

Further, since the heights of the holes are intersected with each other, the flow rate of the fluid can be continuously measured from a small flow rate to a large flow rate. Furthermore, since a small-diameter, high-precision integrated electromagnetic flow meter 4a to 4e capable of passing through an existing manhole is used as the flow meter, sewage, rainwater, etc. flowing through the sewer 1 and the open sewer 2 are used. When the flow rate of the fluid is measured, it is extremely easy to mount and measure the flow meters 4a to 4e for measurement through pits provided in the pipe 1 and the open channel 2.

It should be noted that the present invention is not limited to the above-described embodiment, but can be similarly implemented in the following manner. (A) In the present invention, the number of holes provided in the water stoppage plate 3 depends on the size of the sewer 1 and the open channel 2. For example, as shown in FIG. 2, two holes 3a are provided in the water stop plate 3 or three or more holes (see FIG. 3) are provided in the water stop plate 3 as shown in FIG. It is also possible to provide a flow meter in each hole to introduce a fluid such as sewage or rainwater into the inside of the flow meter.

Also in this case, the heights of the holes are mutually intersected (ΔL in FIGS. 2 and 3).
Preferably represent intersecting portions), whereby the flow rate from a small flow rate to a large flow rate can be continuously measured in the same manner as described above.

(B) In the above embodiment, the sewer 1 and the open sewer 2
In addition, a water stop plate 3 having an outer shape corresponding to the shape of the sewer 1 or the open ditch 2 is provided.
A plurality of holes for introducing a fluid such as sewage or rainwater flowing through the hole and to which a flow meter can be attached are provided in the vertical direction, and integrated electromagnetic flow meters 4a to 4e are respectively attached to these holes, and Although the case where the fluid is introduced into each of the integrated electromagnetic flow meters 4a to 4e has been described,
It is not limited to this.

That is, utilizing the external shape of the flow meter,
The fluid may be introduced into the flow meter. In this case, for example, as shown in FIG. 4, one flow meter 5 having an outer shape corresponding to the shape of the sewer 1 or the open sewer 2 is attached to the sewer 1 or the open sewer 2. A fluid is introduced into the flow meter 5 (in FIG. 4, reference numeral 6 denotes an inner diameter portion of the flow meter 5) or, for example, as shown in FIG. 7, a plurality of (two in FIG. 5) flow meters 5 are configured to introduce a fluid into each of the flow meters 5 (in FIG. 5, reference numeral 6 denotes an inner diameter portion of the flow meter 5). Is shown).

In this case, as in the case described above, one converter common to each flow meter 5 is provided, and the sum of the indications of each flow meter 5 is the actual flow rate. It is preferable to calculate the flow rate and output the calculated flow rate.

(C) In the above embodiment, the case where the electromagnetic flow meter is mounted as the flow meter has been described. However, another type of flow meter may be mounted as the flow meter.

Next, a flow rate measuring device according to a second embodiment of the present invention will be described. FIG. 6 is a partial configuration diagram of this flow rate measuring device. The same portions as those in FIG. 1 are denoted by the same reference numerals, detailed description thereof will be omitted, and only different portions will be described here.

That is, the apparatus of this embodiment is intended to simplify the configuration by reducing the number of electromagnetic flowmeters as compared with the apparatus shown in FIG. 1. Specifically, the apparatus shown in FIG.
One electromagnetic flow meter 4a to 4 at the same height in the water stop plate 3.
Other components are omitted except for 4c, and a short pipe 8 is attached to the hole instead of the omitted electromagnetic flow meters 4d and 4e. The short pipe 8 preferably has an inner diameter and a length that are substantially the same as those of the electromagnetic flow meter so that the flow of the fluid is almost equal to that of the electromagnetic flow meter.

The converter (not shown) is different from the first embodiment in that the electromagnetic flow meter and the short pipe provided at the same height on the water stop plate 3 are indicated by the electromagnetic flow meter. The value is multiplied by the number of holes obtained by adding 1 (= the number of electromagnetic flow meters) to the number of the short pipes 8 to calculate the flow value at the height, and for each of these same heights Have the function of adding the calculated flow values to each other and outputting the total flow value as a result of the addition.

Here, a case where the water level is high and the flow rate is measured by all the electromagnetic flow meters 4a to 4c will be described.
Each of the electromagnetic flow meters 4a to 4c sends an indicated value to the converter. As shown in the following equation (1), the converter calculates the flow rate value for each of the electromagnetic flowmeters and the N short pipes 8 provided at the same height in the water blocking plate.

The flow rate value at each height is equal to the indicated value of the electromagnetic flow meter × (the number of short pipes N + 1) (1) That is, the converter sets the height in the water stop plate 3 to lower, middle and upper parts. , The flow rate values are calculated as shown in the following equations (2) to (4).

Lower flow value F1 = Indicated value of electromagnetic flow meter 4a × 1 (2) Middle flow value F2 = Indicated value of electromagnetic flow meter 4b × 2 (3) Upper flow value F3 = Electromagnetic Expression value of formula flow value 4c × 2 (4) Subsequently, the converter calculates the total flow value Fo by adding these flow values F1 to F3 to each other as shown in the following formula (5). The total flow value Fo is output.

Total flow value Fo = sum of flow values for each height = F1 + F2 + F3 (5) As described above, according to the second embodiment, the inside of the water stop plate 3 is different from the device shown in FIG. Since one electromagnetic flow meter 4a to 4c is omitted for each of the same heights and the others are omitted, and the short pipe 8 is attached to the hole instead of the omitted electromagnetic flow meters 4d and 4e. The flow measurement can be executed only by providing flow meters one by one along the vertical direction, and the configuration can be simplified in addition to the effects of the first embodiment.

Further, according to the second embodiment, the converter comprises:
Change the indicated value of the electromagnetic flow meter to the same height (the number of short pipes +
1) Since an accurate flow value at the height is obtained by multiplying, the accuracy of the measurement when the configuration is simplified can be ensured.

In the second embodiment, the height direction of the water stoppage plate 3 is divided into three stages: upper, middle and lower.
Not limited to this, even if the height direction of the water stop plate 3 is divided into an arbitrary number of stages and an electromagnetic flow meter and a short pipe are provided,
The present invention can be implemented in a similar manner to obtain similar effects.

Further, in the second embodiment, the case where one short pipe 8 is provided in each of the upper part and the middle part in the water stop plate 3 has been described. However, the present invention is not limited to this. Even in a configuration in which a plurality of short tubes are provided in at least one of the upper portion and the middle portion, the present invention can be implemented in the same manner and the same effect can be obtained.

Further, in the second embodiment, the case where the short pipe 8 having the same ease of fluid flow as the electromagnetic flow meter is provided has been described. However, the present invention is not limited to this, and the short pipe 8 is omitted. The present invention can be implemented in the same manner and the same effect can be obtained even if the configuration is such that only the holes are used, and the converter executes the calculation in consideration of the difference in the ease of fluid flow between the electromagnetic flow meter and the holes. be able to. This type of calculation is executed using the following expression (6) instead of expression (1), for example, when the ratio of the ease of flow in the electromagnetic flow meter to the ease of flow in the hole is n: m. be able to.

The flow value at the same height = indicated value of electromagnetic flow meter × (number of holes N · m + n) (6) Next, a flow measurement device according to a third embodiment of the present invention will be described. explain.

FIG. 7 is a perspective view schematically showing a partial configuration of the flow rate measuring apparatus. The same portions as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted. Only different portions will be described here. . For convenience of explanation, FIG. 7 is different from FIG. 6 in the number and arrangement of the electromagnetic flow meters and the holes.

That is, the apparatus of the present embodiment comprises the first and second
In the apparatus of the embodiment, for example, when the electromagnetic flow meter 4b is covered with a lid to perform zero point adjustment at the time of still water, the water level of the fluid flowing through the sewer or open channel is prevented from increasing, and specifically, For example, the lid member 10 is detachably attached to two holes 9 as fluid discharge holes provided at the same height as the electromagnetic flow meter 4b in the water stop plate 3 in advance.

Here, when attaching the cover member 10 to the electromagnetic flow meter 4b, as shown in the perspective view of FIG. 8 and the cross-sectional view taken along the line AA of FIG. The removed lid members are attached to both ends of the electromagnetic flow meter 4b. For this reason, by attaching the lid member 10, the electromagnetic flow meter 4 b
Even if the fluid does not pass through, the fluid will pass through the hole 9 from which the cover member 10 has been removed, so that the static water zero adjustment can be performed while preventing an increase in the water level due to the damming of the fluid. .

As described above, according to the third embodiment, in addition to the structure of the first and second embodiments, the water stop plate 3 is provided with a hole 9 for discharging the fluid, and the hole 9 is formed in the hole 9. Since the lid member 10 of the flow meter for zero water adjustment is detachably attached, in addition to the effects of the first and second embodiments, the lid member 10 is removed from the hole 9 at the time of zero water adjustment. By attaching to the flow meter 4b, the fluid can flow from the hole 9 even when the flow meter 4b is covered, so that the flow of the fluid is not stopped.
Overflow due to an increase in water level can be prevented, and safety at the time of zero adjustment of still water can be ensured.

In the third embodiment, the case where the lid members 10 are attached to the two holes 9 has been described.
The present invention is not limited to this, and the same effect can be obtained by mounting the lid member only in one hole and arranging the other lid member in the vicinity of the sewer or the open channel. Can be. In addition, the present invention can be implemented with various modifications without departing from the scope of the invention.

[0062]

As described above, according to the first and second aspects of the present invention, a water stop plate having an outer shape corresponding to the shape of the sewer or open channel is provided on the sewer or open channel. In this water stop plate, a plurality of holes for introducing a fluid and attaching a flow meter are provided in a vertical direction, and a flow meter is attached to each of the holes, and a fluid is introduced into each of the flow meters. Or, to a sewer or open channel, to attach a flow meter having an outer shape matching the shape of the sewer or open channel, to introduce a fluid into the flow meter, and further, if necessary, Since one converter that calculates and outputs the flow rate so that the sum of the indications of each flow meter becomes the actual flow rate is added, fluid such as sewage or rainwater flowing through the sewer or open drain is added. Highly reliable measurement of small to large flow rates There it is possible to provide a flow rate measuring device.

According to the third and fourth aspects of the present invention, a water stop plate having an outer shape conforming to the shape of the sewer or open drain is provided on the sewer or open drain, and the water stop plate is provided with: A plurality of flow meter holes into which a fluid can be introduced and to which a flow meter can be attached are provided in the vertical direction, and a hole having substantially the same inner diameter as the inner diameter of the flow meter hole is formed in the water blocking plate. When the flow rate of the fluid is small, install the flow meter in each of the flow meter holes and install the flow meter into each flow meter hole to introduce the fluid into each flow meter. That is, when the fluid flows only through the lower hole provided in the water stop plate, only the indication of the lower flow meter is output as it is, and when the flow rate of the fluid increases, that is, provided in the water stop plate If fluid flows into the lower and upper holes provided, the same For each of the flowmeters and holes provided at the height, multiply the indicated value by the flowmeter and the value obtained by adding the number of holes for the flowmeter to the number of holes, to calculate the above and below flow rates. And the sum of the flow values calculated for each of the same heights is calculated and output so that the actual flow rate is obtained, and the flow rate of the fluid can be measured with high accuracy from a small flow rate to a large flow rate, and Since the flow measurement can be performed only by providing one flow meter in the vertical direction, it is possible to provide a flow measurement device that can simplify the configuration.

According to a fifth aspect of the present invention, there is provided a water stop plate according to any one of the first to fourth aspects, wherein a fluid discharge hole is provided, and a cover member for zero-static water adjustment of the flow meter is provided. The fluid discharge hole is detachably attached to the fluid discharge hole.
In addition to the effects provided by the corresponding claim of
At the time of static water zero adjustment, by removing this lid member from the fluid discharge hole and attaching it to the flow meter, the fluid can flow from the fluid discharge hole even if the flow meter is covered, so the flow of the fluid is not stopped In addition, it is possible to provide a flow rate measuring device that can prevent overflow due to an increase in water level and can ensure safety when zero water is adjusted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a flow measuring device according to a first embodiment of the present invention.

FIG. 2 is a front view showing a configuration example of a water stoppage plate (in a case where there are two holes) in the embodiment.

FIG. 3 is a front view showing a configuration example of a water stop plate (when there are three or more holes) in the embodiment.

FIG. 4 is a front view showing another embodiment of the flow measuring device according to the present invention.

FIG. 5 is a front view showing another embodiment of the flow measuring device according to the present invention.

FIG. 6 is a partial configuration diagram of a flow measurement device according to a second embodiment of the present invention.

FIG. 7 is a perspective view schematically showing a partial configuration of a flow measurement device according to a third embodiment of the present invention.

FIG. 8 is a perspective view showing a partial configuration of a flow rate measuring device at the time of zero water adjustment in the embodiment.

FIG. 9 is a cross-sectional view taken along line AA of FIG. 9 showing a partial configuration of the flow rate measuring device at the time of zero water static adjustment in the embodiment.

FIG. 10 is a perspective view showing an example of a conventional flow measurement method.

FIG. 11 is a perspective view showing another example of a conventional flow measurement method.

[Explanation of symbols]

1 ... sewer, 2 ... open channel, 3 ... water stop board, 3a, 3b ... hole,
4 ... Integral electromagnetic flowmeter, 5 ... Flowmeter, 6 ... Inner diameter of flowmeter 5, 7 ... Shape of culvert 1 and open culvert 2, 8 ... Short pipe, 9 ... Hole, 10 ... Lid member, 11: velocity meter, 12: ultrasonic level meter, 13: installation pit, 14: pipeline.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01F 1/00-15/18

Claims (5)

(57) [Claims] 1. A flow rate measuring device for measuring a flow rate of a fluid such as sewage or rainwater flowing through a sewer or open drain, wherein the sewer or open drain has an outer shape corresponding to the shape of the sewer or open drain. Providing a water stop plate having, in the water stop plate, a plurality of holes in which the fluid is introduced and a flow meter can be attached are provided in a vertical direction, and a flow meter is attached to each of the holes, A flow measuring device characterized in that a fluid is introduced into a flow meter of the present invention. 2. The flow measuring device according to claim 1, wherein the heights of the holes are intersected with each other. 3. A flow measuring device for measuring a flow rate of a fluid such as sewage or rainwater flowing through a sewer or open channel, wherein the sewer or open channel has an outer shape matching the shape of the sewer or open channel. Providing a water stop plate having a plurality of flow meter holes, in which the fluid is introduced and a flow meter can be attached to the water stop plate in a vertical direction, and the flow stop hole is provided in the water stop plate. A hole having an inner diameter substantially the same as the inner diameter of the flowmeter is provided at a position horizontally offset from each of the flowmeter holes, and a flowmeter is attached to each of the flowmeter holes, and the respective flow rates are A flow measuring device characterized in that a fluid is introduced into the meter. 4. The flow rate measuring device according to claim 3, wherein, for each of the flow meter and the hole provided at the same height in the water stop plate, a value indicated by the flow meter and the number of the holes are used. The flow rate value at the height is calculated by multiplying the flow rate value by the value obtained by adding the number of the flow meter holes, and the actual flow rate is obtained by adding the flow rate values calculated at the same height to each other. A flow rate measuring apparatus characterized by adding one converter for calculating and outputting a flow rate. 5. The flow measuring device according to claim 1, wherein a fluid discharge hole is provided in the water stop plate, and a cover member for zero adjustment of static water of the flow meter is provided with the fluid. A flow measuring device, which is detachably attached to a discharge hole.