JP2001082988A - Flow measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of installation space even in an existing facility and to measure flow rate at a low cost. SOLUTION: This flow measuring apparatus includes: a first unit container 2 provided at a flow passage end 1 so that fluid entirely flows therein; a second unit container 3 provided in contact with the first unit container 2 and having an opening communicated with the first unit container 2 at its bottom; a pressure difference generating means 4 for generating a pressure difference within a flow passage extending from the first unit container 2 including the opening to the second unit container 3; and a differential pressure detecting means 6 mounted in a hole part provided in the portions of contact between the first unit container 2 and the second unit container 3 for detecting the pressure difference between the first unit container 2 and the second unit container 3.

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 used for measuring a fluid flow rate in an open circuit, for example, for water treatment and the like, and more particularly to improving the installation space efficiency and realizing the flow rate measurement at low cost. The present invention relates to a flow measurement device that can be used.

[0002]

2. Description of the Related Art Conventionally, measurement of a fluid flow rate in an open circuit such as water treatment has been performed by using a weir type flow meter.

[0005] Further, as shown in a schematic diagram in FIG. 9, the flow path can be changed, and the flow rate can be measured by an electromagnetic flow meter 25 installed in a pipe 26 on the downstream side of the weir 24 of the open channel 23.

[0004]

However, in the case of a weir type flow meter, it is necessary to make a flow path for measurement, which is very costly.

On the other hand, in the measurement method using the electromagnetic flow meter, not only must the flow path be changed to fill the pipe 26 with water, but also a space for installing the electromagnetic flow meter 25 is required. Furthermore, the cost of the electromagnetic flow meter 25 is high, and it is not suitable for a small-scale processing facility.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flow rate measuring device which can improve the installation space efficiency and realize flow rate measurement at low cost even in an existing facility.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a first unit container provided at an end of a flow passage so that all fluids flow therein; A second unit container provided in contact with the unit container and having an opening with the first unit container at the bottom, and in a flow path from the first unit container including the opening to the second unit container. A pressure difference generating means for generating a pressure difference, which is attached to a hole provided at a portion where the first unit container and the second unit container are in contact with each other, and between the first unit container and the second unit container; And a differential pressure detecting means for detecting the pressure difference.

Here, in particular, as the pressure difference generating means, for example, a plurality of plate-like projections are provided on the inner side wall of the second unit container, or for example, as described in claim 3 In addition, the flow area of the second unit container is
The area of the opening may be smaller than the channel area of the unit container, or the opening area of the opening may be set to the first area.
Is preferably smaller than the channel area of the unit container.

Therefore, in the flow rate measuring device according to the present invention, when the fluid is not flowing, the water level of the first unit container and the water level of the second unit container are the same. When the fluid flows, the difference in water level between the two unit containers increases according to the magnitude of the fluid flow rate due to the pressure difference generated by the pressure difference generating means. Then, a pressure difference between the two unit containers is measured as a water level difference by a differential pressure detecting means attached to a hole provided at a portion where the two unit containers are in contact with each other, and can be converted into a flow rate.

In this case, since the two unit containers can be easily attached to an existing facility, the space for installing the flow meter can be omitted, and the flow rate can be measured at low cost. .

According to a fifth aspect of the present invention, in the flow rate measuring device of the first aspect of the present invention, a differential pressure transmitter is used as the differential pressure detecting means, and the detected first unit is used. From the pressure difference between the container and the second unit container,
An arithmetic function is provided for obtaining the flow rate of the fluid using a relational expression between the pressure difference and the flow rate obtained in advance.

Therefore, the flow rate measuring apparatus according to the present invention has an arithmetic function as a differential pressure transmitter and has a pressure difference and a flow rate based on a pressure difference between two unit containers. The flow rate of the fluid can be quickly measured by determining the flow rate of the fluid by using the relational expression.

Further, in the invention according to claim 6, in the flow measuring device according to the invention according to claim 1, a partition body is provided in one container having one end opened so as to open only the lower part. , A first unit container and a second unit container.

Therefore, in the flow rate measuring device according to the invention, the partition unit is provided so as to open only at the lower part in one container having one end opened to form two unit containers. Therefore, the apparatus can be simply configured, and the cost can be reduced.

According to a seventh aspect of the present invention, in the flow rate measuring device according to the first aspect of the present invention, as the differential pressure detecting means, the high-pressure side and the low-pressure side pressure receiving diaphragms have a front-to-back positional relationship. A differential pressure transmitter with a remote seal diaphragm having a pressure receiving section is used.

Therefore, in the flow rate measuring apparatus according to the present invention, the differential pressure detecting means is provided with a remote seal diaphragm having a pressure receiving portion in which the high pressure side and the low pressure side pressure receiving diaphragm are positioned in front and back. By using the transmitter, the pressure difference can be easily measured simply by attaching the pressure receiving portion to the hole provided at the portion where the two unit containers are in contact.

According to an eighth aspect of the present invention, in the flow rate measuring apparatus according to the seventh aspect of the present invention, the two pressure receiving portions of the differential pressure transmitter with the remote seal diaphragm are integrated to form a high pressure side and a low pressure side. The pressure receiving diaphragm is a pressure receiving portion having a front-to-back positional relationship.

Therefore, in the flow rate measuring apparatus according to the present invention, the two pressure receiving portions of the differential pressure transmitter with the remote seal diaphragm are integrated, and the high pressure side and the low pressure side pressure receiving diaphragms are arranged in front and back relative to each other. By using the pressure receiving part, the device can be easily attached,
It becomes cheap in terms of cost.

On the other hand, according to a ninth aspect of the present invention, in the flow rate measuring device according to the sixth or seventh aspect, the pressure receiving portion of the differential pressure transmitter with the remote seal diaphragm and the cone at the circumferential portion are provided. A first projection having a tapered surface is provided, and the partition has a cone-shaped tapered surface in contact with the tapered surface of the first projection, and the cylindrical portion is substantially C-shaped.
A second projection body cut out in a letter shape is provided, and an elastic body is provided between the partition body and the pressure receiving portion.

Therefore, in the flow rate measuring apparatus according to the present invention, a first projection is provided on the pressure receiving portion of the differential pressure transmitter, and a second projection is provided on the partition, so that the partition and the pressure receiving device are connected to each other. By providing the elastic body between the pressure transmitter and the unit, the differential pressure transmitter can be removed and attached simply by pulling up the differential pressure transmitter, thereby facilitating maintenance.

According to a tenth aspect of the present invention, in the flow rate measuring device according to the ninth aspect, an O-ring is used as an elastic body.

Therefore, in the flow rate measuring apparatus according to the invention, an O-ring capable of sealing even with a small pressing force is used as the elastic body provided between the partition body and the pressure receiving portion. A first projection and a second projection
The processing tolerance of the projection can be made rough, and the cost can be reduced. Further, the O-ring is less likely to be caught in the hole and is easier to insert and remove.

Further, in the invention according to claim 11,
In the flow rate measuring device according to the invention corresponding to claim 7,
In the pressure receiving part of the differential pressure transmitter with remote seal diaphragm,
A first projection having a cone-shaped tapered surface is provided on a circumferential portion, and a partition has a cone-shaped tapered surface in contact with the tapered surface of the first projection, and the cylindrical portion has a substantially C-shape. A cut-out elastic second protrusion is provided.

Therefore, in the flow rate measuring apparatus according to the present invention, the first projection is provided on the pressure receiving portion of the differential pressure transmitter, and the second projection is provided on the partition body. As in the case of the invention corresponding to claim 9,
By simply pulling up the differential pressure transmitter, it can be detached and attached, which facilitates maintenance and further simplifies the configuration.

According to a twelfth aspect of the present invention, in the flow rate measuring apparatus according to the eleventh aspect,
The second projection provided on the partition is made of rubber.

Therefore, in the flow rate measuring device according to the invention, the second projection is made of rubber, so that the second projection is deformed at the time of attachment and detachment. The same operation as that of the invention corresponding to No. 9 can be obtained.

According to a thirteenth aspect of the present invention, in the flow rate measuring apparatus according to the eleventh aspect,
The second protrusion provided on the partition is fixed via an elastic body.

Therefore, in the flow rate measuring apparatus according to the present invention, the second projection is elastically attached, so that the differential pressure transmission can be performed in the same manner as in the above-mentioned invention. Just pull up the container, remove,
In addition to being able to be mounted, maintenance is easy, and the configuration is further simplified.

According to a fourteenth aspect of the present invention, in the flow rate measuring device according to the thirteenth aspect,
The second protrusion is fixed to the partition plate via a spring washer.

Therefore, in the flow rate measuring apparatus according to the fourteenth aspect of the present invention, the second protrusion is fixed via the spring washer, so that the second aspect of the present invention provides a flow rate measuring apparatus similar to the ninth aspect of the present invention. By simply pulling up the differential pressure transmitter, it can be detached and attached, which facilitates maintenance and further simplifies the configuration. Furthermore, since a general-purpose spring washer can be used, the cost of the apparatus is further reduced.

According to a fifteenth aspect of the present invention, in the flow rate measuring device according to the thirteenth aspect,
The second protrusion is fixed to the partition plate via a rubber bush.

Therefore, in the flow rate measuring device according to the present invention, the second projection is fixed via the rubber bush, so that the second projecting member is fixed in the same manner as in the above-described invention according to claim 9. Just pull up the differential pressure transmitter,
It can be removed and attached, making maintenance easier, and further simplifying the configuration.

Further, in the invention according to claim 16,
In the flow rate measuring device according to the invention, the second projection is fixed to the partition plate via a rubber plate.

Therefore, in the flow rate measuring apparatus according to the invention, the second protrusion is fixed via the rubber plate, thereby achieving the same effect as the above-mentioned invention according to the ninth aspect. By simply pulling up the differential pressure transmitter, it can be detached and attached, which facilitates maintenance and further simplifies the configuration.

According to a seventeenth aspect of the present invention, in the flow rate measuring device according to the thirteenth aspect, the second projection is fixed to the partition plate with an adhesive having elasticity even during curing.

Therefore, in the flow rate measuring apparatus according to the present invention, the second projection is fixed with an adhesive having elasticity even at the time of curing, whereby the above-mentioned ninth aspect is achieved.
As in the case of the invention corresponding to the above, the differential pressure transmitter can be detached and attached only by pulling up the differential pressure transmitter, so that the maintenance becomes easy and the configuration is further simplified.

As described above, even in existing facilities, installation space
It is possible to improve flow efficiency and realize flow measurement at low cost.

[0038]

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

(First Embodiment: Corresponding to Claims 1, 2, and 6) FIG. 1 is a cross-sectional view showing an example of a general configuration of a flow rate measuring apparatus according to this embodiment.

In FIG. 1, a first unit container 2 is provided at a flow path end 1 so that all the fluid flows therein. The first unit container 2 is in contact with the first unit container 2 and has an opening with the first unit container 2 at the bottom. And a second unit container 3 is provided.

Here, the first unit container 2 and the second unit container 3 are constituted by providing a partition plate 7 in a substantially cubic container 5 having one end opened so that only the lower part is opened. can do.

Further, in the flow path from the first unit container 2 including the opening to the second unit container 3, that is, in this example,
On the inner side wall of the second unit container 3, a plurality of plate-shaped projections 4 as pressure difference generating means for generating a pressure difference in the flow path are provided as shown in the figure.

Further, in the portion where the first unit container 2 and the second unit container 3 are in contact with each other, that is, in the hole 7a provided in the partition plate 7, the first unit container 2 and the second unit container 3 Pressure transmitter 6 which is a differential pressure detecting means for detecting the pressure difference between
Is installed.

Here, the differential pressure transmitter 6 detects a pressure difference between the first unit container 2 and the second unit container 3 as a water level difference.

In the flow rate measuring device of the present embodiment configured as described above, the fluid flowing from the first unit container 2 to the second unit container 3 from the flow path end 1 is supplied to the second unit container 3 A pressure loss occurs due to the plate-shaped projections 4 provided inside the first unit container 2 and the first unit container 2 overflows from the container 5 at a liquid level lower than the liquid level.

In this case, when the fluid is not flowing, the water levels of the two unit containers of the first unit container 2 and the second unit container 3 are the same, and when the fluid flows, the first unit container 2 including the opening is opened. Due to the pressure difference generated by the plate-shaped projections 4 which are pressure difference generating means provided in the flow path from the unit container 2 to the second unit container 3, the water level difference between the two unit containers depends on the magnitude of the flow rate. Increase accordingly.

Then, the pressure difference between the two unit containers is detected as a water level difference, and can be converted into a flow rate.

That is, since the water level difference increases as the flow rate increases, the pressure difference between the two unit containers is detected as the water level difference h by the differential pressure transmitter 6, and the water level difference h and the flow rate determined in advance are determined. From the relational expression with Q (Q = f (h)), the flow rate flowing in the container 5 can be obtained.

The output from the differential pressure transmitter 6 is 4 to 20 mA DC proportional to the pressure difference, and is converted into a flow rate signal by a higher-order arithmetic unit based on the current signal, and is used for control, monitoring, etc. Used for

In this case, since the two unit containers can be easily attached to the existing facility, the space for installing the flow meter as in the conventional case described above can be omitted, and
Flow measurement can be realized at low cost.

The first unit container 2 and the second unit container 3 can be constituted by providing a partition plate 7 in a substantially cubic container 5 having one end opened so as to open only the lower part. The apparatus can be simply constructed and the cost is low.

As described above, the flow rate measuring apparatus according to the present embodiment can be easily attached to an existing facility, so that the space for installing the flow meter is omitted and the installation space efficiency is improved. Moreover, the flow rate measurement can be realized at low cost.

(Second Embodiment: Corresponding to Claim 5) The flow rate measuring apparatus of the present embodiment is the same as the flow rate measuring apparatus of the first embodiment described above, except that the detected first unit container The differential pressure transmitter is provided with an arithmetic function for obtaining the flow rate of the fluid from the water level difference corresponding to the pressure difference between the second unit container 3 and the second unit container 3 by using a relational expression between the water level difference and the flow rate obtained in advance. 6 is provided.

In the flow rate measuring apparatus of the present embodiment configured as described above, since the differential pressure transmitter 6 has an arithmetic function, the relational expression Q = f between the water level difference h and the flow rate Q is obtained.
Based on (h), the flow rate Q of the fluid is calculated on the differential pressure transmitter 6 side from the water level difference h corresponding to the pressure difference between the two unit vessels, and the output signal of the differential pressure transmitter 6 is proportional to the flow rate of the fluid. Obtained as

Thus, the flow rate of the fluid can be measured quickly.

As described above, the flow rate measuring device according to the present embodiment can obtain the same effects as those of the above-described first embodiment, and can quickly measure the flow rate of a fluid. It becomes possible.

(Third Embodiment: Corresponding to Claim 7) FIG. 2 is a sectional view showing an example of a mounting structure of a differential pressure transmitter in a flow measuring device according to the present embodiment, and is the same as that of FIG. Are denoted by the same reference numerals and description thereof is omitted, and only different portions will be described here.

That is, the flow measuring device of the present embodiment is the same as the flow measuring device of the first embodiment described above, except that the differential pressure transmitter 6 is used as the high pressure side pressure receiving diaphragm 9.
In addition, a differential pressure transmitter with a remote seal diaphragm having a pressure receiving portion in which the pressure receiving diaphragm 8 on the low pressure side has a positional relationship between the front and back sides is used.

In FIG. 2, reference numeral 10 denotes a pressure-sensitive sensor which is disposed in the pressure receiving portion and senses pressure, and 11 denotes a circuit board.

In the flow rate measuring apparatus of the present embodiment configured as described above, the differential pressure transmitter 6 is provided with a remote pressure-receiving section having a high-pressure side and a low-pressure side pressure-receiving diaphragms 9 and 8 in a front-to-back positional relationship. By using a differential pressure transmitter with a seal diaphragm, the water level difference corresponding to the pressure difference can be easily measured simply by attaching the pressure receiving section to the hole 7a of the partition plate 7 provided at the portion where the two unit containers are in contact. Can be.

As described above, the flow rate measuring device according to the present embodiment can obtain the same effects as those of the above-described first embodiment, and also includes a pressure receiving section formed of two unit containers. The pressure difference can be easily measured simply by attaching to the hole 7a of the partition plate 7 provided at the contacting portion.

(Fourth Embodiment: Corresponding to Claim 8) A flow rate measuring apparatus according to the present embodiment is the same as the flow rate measuring apparatus according to the third embodiment described above, except that a differential pressure transmitter with a remote seal diaphragm is provided. The two pressure receiving portions are integrated, and the pressure receiving diaphragms 9 and 8 on the high pressure side and the low pressure side are configured as pressure receiving portions in a positional relationship between front and back.

In the flow rate measuring apparatus of the present embodiment configured as described above, the two pressure receiving portions of the differential pressure transmitter with the remote seal diaphragm are integrated, and the high pressure side and low pressure side pressure receiving diaphragms 9 and 8 are front and back. With the pressure receiving portion having the above positional relationship, the device can be easily attached, and the cost can be reduced.

As described above, in the flow rate measuring device according to the present embodiment, the same effects as in the third embodiment can be obtained, and in addition, the device can be easily attached. It becomes possible and the cost becomes low.

(Fifth Embodiment: Claims 9 and 1)
FIG. 3 is a cross-sectional view showing an example of a mounting structure of a differential pressure transmitter in the flow rate measuring device according to the present embodiment. The same elements as those in FIGS. 1 and 2 are denoted by the same reference numerals. The description will be omitted, and only different portions will be described here.

That is, the flow rate measuring device of the present embodiment is different from the flow rate measuring device of the first or third embodiment described above in that the pressure receiving portion of the differential pressure transmitter 6 and the circumferential portion have the same structure. A projection 12, which is a first projection having a cone-shaped tapered surface, is provided. The partition plate 7 has a cone-shaped tapered surface in contact with the tapered surface of the projection 12, and the cylindrical portion is substantially C-shaped. Fixed to a C-shaped ring 13 which is a second projection body cut out, and further, a partition plate 7 and a differential pressure transmitter 6
The O-ring 14 which is an elastic body is provided between the pressure receiving portion and the pressure receiving portion.

In FIG. 3, reference numeral 16 denotes a fixing bolt for fixing the C-shaped ring 13 to the partition plate 7.

That is, the differential pressure transmitter 6 can be detached from the partition plate 7 and fixed at the time of maintenance or the like.

Also, the play caused by the processing error of the projection 12 and the C-shaped ring 13 can be absorbed by the elasticity of the O-ring 14, and the gap between the pressure receiving portion of the differential pressure transmitter 6 and the partition plate 7 can be reduced. Can be sealed with the O-ring 14.

Further, the C-shaped ring 13 can be pulled out right above by cutting the upper part, and cut slightly above the center so that it does not come off easily.

That is, when pulling out the differential pressure transmitter 6 upward, the projection 1 passing through the cut surface of the C-shaped ring 13
Since the maximum of the cross section of No. 2 is the center plane, a position having a larger cross section (how much higher than the center) is selected as the cut plane.

In the flow rate measuring device of the present embodiment configured as described above, when the differential pressure transmitter 6 is pulled up, the projection 12 of the differential pressure transmitter 6 is pressed against the partition plate 7 side. The ring 14 can be shifted upward by being compressed and approaching the partition plate 7.

When the center cross section of the projection 12 exceeds the cut surface of the C-shaped ring 13, the compression rate of the O-ring 14 decreases, and the differential pressure transmitter 6 comes off the partition plate 7.

This eliminates the need to remove the bolts by putting hands in the water as in the case of fixing with bolts as shown in FIG. 2, for example, and only by pulling up the differential pressure transmitter 6. Can be removed, attached,
Maintenance becomes easy.

The elastic member can be sealed with a rubber packing or the like. However, since the O-ring 14 that can seal even with a small pressing force is used, the protrusion 12
In addition, the processing tolerance of the C-shaped ring 13 can be made rough, and the cost can be reduced.

Further, the O-ring 14 is less likely to be caught in the hole, and can be easily inserted and removed.

As described above, the flow rate measuring device according to the present embodiment can obtain the same effects as those of the above-described first embodiment or the third embodiment, and also can provide a difference. By simply pulling up the pressure transmitter 6, it can be removed and attached, maintenance becomes easy, and the processing tolerance of the projection 12 and the C-shaped ring 13 is roughened by using the O-ring 14 as an elastic body. Can be
The cost can be reduced, and it is possible to make it easier to insert and remove.

(Sixth Embodiment: Corresponding to Claims 11 and 12) FIG. 4 is a cross-sectional view showing an example of a mounting structure of a differential pressure transmitter in a flow rate measuring apparatus according to this embodiment. The same elements as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described here.

That is, the flow rate measuring device of the present embodiment is the same as the flow rate measuring device of the third embodiment described above, except that the C-shaped ring 13 is a C-shaped ring made of an elastic material such as rubber having elasticity. 15.

In the flow rate measuring apparatus of the present embodiment configured as described above, as in the case of the fifth embodiment described above, the differential pressure transmitter 6 can be removed and attached only by pulling up. In addition to the ease of maintenance, the C-shaped ring 13 is made of rubber, so that the C-shaped ring 1
By deforming 3, the same effect as providing an elastic body between the partition plate 7 and the differential pressure transmitter 6 can be obtained, and the configuration is further simplified.

As described above, the flow rate measuring apparatus according to the present embodiment can obtain the same effects as those of the above-described fifth embodiment, and can further simplify the configuration. Becomes possible.

(Seventh Embodiment: Corresponding to Claim 13)
The flow measuring device according to the present embodiment is configured such that the C-shaped ring 13 provided on the partition plate 7 is fixed via an elastic body in the flow measuring device according to the above-described sixth embodiment.

In the flow rate measuring apparatus of the present embodiment configured as described above, since the C-shaped ring 13 is elastically attached, the C-shaped ring 13
Since the character-shaped ring 13 is separated from the partition plate 7, it can be removed and attached only by pulling up the differential pressure transmitter 6, as in the case of the above-described sixth embodiment.
In addition to the ease of maintenance, the configuration is much simpler.

As described above, the flow rate measuring apparatus according to the present embodiment can obtain the same effects as those of the above-described fifth embodiment, and can further simplify the configuration. Becomes possible.

(Eighth Embodiment: Corresponding to Claim 14)
FIG. 5 is a cross-sectional view showing an example of the mounting configuration of the differential pressure transmitter in the flow rate measuring device according to the present embodiment.
The same elements as those described above are denoted by the same reference numerals and description thereof will be omitted, and only different parts will be described here.

That is, the flow rate measuring device according to the present embodiment is configured such that the C-shaped ring 13 is fixed to the partition plate 7 via the spring washer 17 in the flow rate measuring device according to the seventh embodiment described above. .

In this case, it is necessary to prevent the spring washer 17 from being completely compressed in the fixed state. In this example, the lock nut 18 is used so that the fixing bolt 16 is not loosened.

In the flow rate measuring device of the present embodiment configured as described above, the C-shaped ring 13 is connected to the spring washer 17.
By fixing the differential pressure transmitter 6 to the partition plate 7 by simply pulling up the differential pressure transmitter 6 as in the case of the above-described seventh embodiment, maintenance is easy. In addition to this, the configuration is further simplified.

Further, since the spring washer 17 which is a general-purpose product can be used, the cost of the apparatus is further reduced.

As described above, the flow rate measuring apparatus according to the present embodiment can achieve the same effects as those of the above-described seventh embodiment, and can further reduce the cost. Becomes possible.

(Ninth Embodiment: Corresponding to Claim 15)
FIG. 6 is a cross-sectional view showing an example of the mounting configuration of the differential pressure transmitter in the flow rate measuring device according to the present embodiment.
The same elements as those described above are denoted by the same reference numerals and description thereof will be omitted, and only different parts will be described here.

That is, in the flow rate measuring device of the present embodiment, the C-shaped ring 13 is fixed to the partition plate 7 via the rubber bush 19 and the washer 20 in the flow rate measuring device of the seventh embodiment described above. It has a configuration.

In the flow rate measuring device of the present embodiment configured as described above, the C-shaped ring 13 is fixed to the partition plate 7 via the rubber bush 19 and the washer 20, so that the above-mentioned seventh embodiment is described. As in the case of the embodiment, the differential pressure transmitter 6 can be detached and attached only by pulling up, so that maintenance is easy and the configuration is further simplified.

As described above, the flow rate measuring apparatus according to the present embodiment can obtain the same effects as those of the above-described seventh embodiment, and can further simplify the configuration. Becomes possible.

(Tenth Embodiment: Corresponding to Claim 16) FIG. 7 is a sectional view showing an example of a mounting structure of a differential pressure transmitter in a flow rate measuring apparatus according to this embodiment.
The same elements as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described here.

That is, the flow measuring device of the present embodiment is the same as the flow measuring device of the seventh embodiment described above, except that the C-shaped ring 13 is connected to the partition plate 7 via the rubber plate 21.
To be fixed.

In this case, in the present embodiment, the partition plate 7 and the rubber plate 21, and the rubber plate 21 and the C-shaped ring 13 are fixed with an adhesive.

In the flow rate measuring apparatus of the present embodiment configured as described above, the C-shaped ring 13 is fixed to the partition plate 7 with the rubber plate 21 interposed therebetween. As in the case of the embodiment, the differential pressure transmitter 6 can be removed and attached only by pulling up,
In addition to the ease of maintenance, the configuration is much simpler.

As described above, the flow rate measuring device according to the present embodiment can obtain the same effects as those of the above-described seventh embodiment, and can further simplify the configuration. Becomes possible.

(Eleventh Embodiment: Corresponding to Claim 17) FIG. 8 is a cross-sectional view showing an example of a mounting structure of a differential pressure transmitter in a flow rate measuring apparatus according to this embodiment.
The same elements as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described here.

That is, the flow rate measuring device of the present embodiment is the same as the flow rate measuring device of the seventh embodiment described above, except that the C-shaped ring 13 is made of an adhesive 22 having elasticity even when hardened, such as rubber glue. It is configured to be fixed to the partition plate 7.

In the flow rate measuring apparatus according to the present embodiment configured as described above, the C-shaped ring 13 is fixed to the partition plate 7 with the adhesive 22 having elasticity even at the time of curing. As in the case of the seventh embodiment, it is possible to remove and attach the differential pressure transmitter 6 only by pulling it up, so that maintenance is easy and the configuration is further simplified.

As described above, the flow rate measuring apparatus according to the present embodiment can obtain the same effects as those of the above-described seventh embodiment, and can further simplify the configuration. Becomes possible.

(Other Embodiments) (a) In the above embodiment, a pressure difference is generated in the flow path from the first unit container 2 including the opening to the second unit container 3. As means, the second unit container 3
The case in which the plurality of plate-shaped projections 4 are provided on the inner side wall of the first unit container 2 is not limited to this, and the flow area of the second unit container 3 By making it smaller than the road area, a similar pressure difference may be generated (corresponding to claim 3).

(B) In the above embodiment, the pressure difference generating means for generating a pressure difference in the flow path from the first unit container 2 including the opening to the second unit container 3 is the second unit.
The case where the plurality of plate-like projections 4 are provided on the inner side wall of the unit container 3 has been described. However, the present invention is not limited to this, and the pressure difference generating means may be provided between the first unit container 2 and the second unit container 3. The same pressure difference may be generated by making the opening area of the opening smaller than the flow area of the first unit container 2 (corresponding to claim 4).

(C) In the above embodiment, the case where the pressure difference between the first unit container 2 and the second unit container 3 is detected as the water level difference has been described.
The water level of the first unit container 2 and the second unit container 3 may be determined by measuring the water levels of the unit container 2 and the second unit container 3 with a float, respectively.

[0107]

As described above, according to the flow rate measuring apparatus of the present invention, water treatment and the like can be performed with a simple structure using a differential pressure transmitter without providing a flow meter in a drain pipe as in the prior art. Since the flow rate can be measured in an open circuit, various effects as described below can be obtained.

(A) Since it is not necessary to provide a dedicated flow measurement line, the installation space efficiency is improved.

(B) The flow rate measurement can be realized at low cost because of the simple configuration using the differential pressure transmitter.

(C) The differential pressure detecting part which is submerged is easily removable, and it is not necessary to work by putting a hand in the fluid, and maintenance becomes easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a flow measurement device according to the present invention.

FIG. 2 is a cross-sectional view showing an example of a mounting configuration of a differential pressure transmitter in a flow measuring device according to a third embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an example of a mounting structure of a differential pressure transmitter in a flow measuring device according to a fifth embodiment of the present invention.

FIG. 4 is a cross-sectional view showing an example of a mounting configuration of a differential pressure transmitter in a flow measuring device according to a sixth embodiment of the present invention.

FIG. 5 is a cross-sectional view showing an example of a mounting structure of a differential pressure transmitter in a flow measuring device according to an eighth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing an example of a mounting configuration of a differential pressure transmitter in a flow measurement device according to a ninth embodiment of the present invention.

FIG. 7 is a sectional view showing an example of a configuration of mounting a differential pressure transmitter in a flow measuring device according to a tenth embodiment of the present invention.

FIG. 8 is a cross-sectional view showing an example of a mounting structure of a differential pressure transmitter in a flow measuring device according to an eleventh embodiment of the present invention.

FIG. 9 is a schematic diagram showing an example of conventional flow measurement.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flow path end 2 ... 1st unit container 3 ... 2nd unit container 4 ... Plate-shaped protrusion 5 ... Container 6 ... Differential pressure transmitter 7 ... Partition plate 8 ... Low pressure side pressure receiving diaphragm 9 ... High pressure side pressure receiving diaphragm DESCRIPTION OF SYMBOLS 10 ... Pressure sensor 11 ... Circuit board 12 ... Projection part 13 ... C-shaped ring 14 ... O-ring 15 ... C-shaped ring 16 ... Fixing bolt 17 ... Spring washer 18 ... Lock nut 19 ... Rubber bush 20 ... Washer 21 ... rubber plate 22 ... adhesive.

Claims (17)

[Claims] 1. A first unit container provided at an end of a flow passage so that all fluid flows therein, and a first unit container which is in contact with the first unit container and has an opening at the bottom and provided with an opening. A second unit container, a pressure difference generating means for generating a pressure difference in a flow path from the first unit container including the opening to the second unit container, the first unit container and the second unit container. And a differential pressure detecting means attached to a hole provided at a portion where the second unit container contacts the second unit container and configured to detect a pressure difference between the first unit container and the second unit container. A flow measuring device characterized by the above-mentioned. 2. The flow rate measuring device according to claim 1, wherein a plurality of plate-like projections are provided on an inner side wall of the second unit container as the pressure difference generating means. apparatus. 3. The flow rate measuring device according to claim 1, wherein, as the pressure difference generating means, a flow passage area of the second unit container is smaller than a flow passage area of the first unit container. A flow measuring device characterized by the following. 4. The flow rate measuring device according to claim 1, wherein the pressure difference generating means has an opening area of the opening smaller than a flow path area of the first unit container. Flow measurement device. 5. The flow rate measuring device according to claim 1, wherein a differential pressure transmitter is used as the differential pressure detecting means, and the differential pressure detecting means is disposed between the detected first unit container and the second unit container. A flow rate measuring device having an arithmetic function for calculating the flow rate of the fluid from the pressure difference using a relational expression between the pressure difference and the flow rate obtained in advance. 6. The flow rate measuring device according to claim 1, wherein the first unit container and the second unit container are provided by providing a partition so that only one lower part is opened in one container having one end opened. A flow rate measuring device comprising a unit container. 7. The differential pressure sensor with a remote seal diaphragm according to claim 1, wherein the differential pressure detecting means has a pressure receiving portion having a high pressure side and a low pressure side pressure receiving diaphragm in a front-to-back positional relationship. A flow measuring device characterized by using a transmitter. 8. The flow measuring device according to claim 7, wherein the two pressure receiving portions of the differential pressure transmitter with the remote seal diaphragm are integrated, and a high pressure side and a low pressure side pressure receiving diaphragm are in a front-to-back positional relationship. A flow measuring device characterized by being a pressure receiving part. 9. The flow measuring device according to claim 6, wherein the pressure receiving portion of the differential pressure transmitter with the remote seal diaphragm has a cone-shaped tapered surface in a circumferential portion. A second projection having a cone-shaped tapered surface in contact with the tapered surface of the first projection and having a cylindrical portion cut out in a substantially C-shape; An elastic body is provided between a body and the pressure receiving section. 10. The flow measurement device according to claim 9, wherein an O-ring is used as the elastic body. 11. The flow rate measuring device according to claim 7, wherein a pressure-receiving portion of the differential pressure transmitter with the remote seal diaphragm is provided with a first protrusion having a conical tapered surface in a circumferential portion. The partition body is provided with an elastic second protrusion having a cone-shaped tapered surface in contact with the tapered surface of the first protrusion and a cylindrical portion cut out in a substantially C-shape. Flow measurement device. 12. The flow measuring device according to claim 11, wherein the second protrusion provided on the partition is made of rubber. 13. The flow measuring device according to claim 11, wherein a second projection provided on the partition is fixed via an elastic body. 14. The flow measuring device according to claim 13, wherein the second projection is fixed to a partition plate via a spring washer. 15. The flow measuring device according to claim 13, wherein the second projection is fixed to a partition plate via a rubber bush. 16. The flow measuring device according to claim 13, wherein the second projection is fixed to a partition plate via a rubber plate. 17. The flow measuring device according to claim 13, wherein the second projection is fixed to the partition plate with an adhesive having elasticity even during curing.