JPH08193856A - Mounting device of electromagnetic flowmeter - Google Patents

Abstract

PURPOSE: To obtain a mounting device by which an electromagnetic flowmeter to be installed at a manhole or the like can be easily mounted concentrically with a duct and which can enhance the measuring accuracy of a flow rate when the diameter of the duct differs from that of the electromagnetic flowmeter. CONSTITUTION: A cylindrical insertion part 21 whose inner circumference is taper-shaped is welded to a platelike mounting member 2 which is fixed and bonded to an electromagnetic flowmeter 1. The insertion part 21 is inserted into the downstream open end of a duct 8 which is opened in a manhole wall 7 for sewage. Bolts 6 are screwed to nuts 14 which are buried in the manhole wall 7, the mounting member 2 is fixed, and the electromagnetic flowmeter 1 is mounted. The sewage flows smoothly by the inner-circumferential taper part of the insertion part 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic flow meter mounting device for mounting an electromagnetic flow meter on a pipe line.

[0002]

2. Description of the Related Art When measuring the flow rate of sewage flowing down a pipeline of a sewer, the inner diameter of a measuring pipe of an electromagnetic flow meter is adjusted to the inlet that flows into a manhole from an upstream pipe.
An electromagnetic flow meter was attached to the wall of the manhole.

That is, as shown in FIG. 10, the electromagnetic flowmeter 1 is sandwiched between a plate-shaped mounting member 2 and an annular flange 3 and the base end (the left end in the drawing) is welded to the mounting member 2. After inserting the tip of the bolt 4 (the right end in the drawing) into the bolt hole opened in the flange 3 and screwing the nut 5 onto the tip of the bolt 4,
The attachment member 2 was attached to the manhole wall surface 7 with the six attachment bolts 6 as shown in FIG.

Reference numeral 8 is a cylindrical pipe which flows in from the upstream of the manhole, and 9 is an inlet of the manhole. Arrow A indicates the flow of fluid. 10 is an annular rubber ring, which is an inlet 9
Between the manhole wall and the mounting member 2 so as to be concentric with the inlet 9, that is, concentric with the axis of the conduit 8 and the inner diameter of the measuring tube of the electromagnetic flowmeter 1. Thus, water leakage between the inlet 9 of the pipe 8 and the measuring pipe of the electromagnetic flowmeter 1 is prevented.

[0005]

SUMMARY OF THE INVENTION In the above conventional technique,
Since the electromagnetic flowmeter is mounted by fixing the plate-shaped mounting member 2 to the wall surface of the manhole, it is difficult to position the inlet 9 of the pipe 8 to the manhole and the axis of the measuring pipe of the electromagnetic flowmeter 1 so that they are aligned with each other. However, there was a problem that the mounting work took time.

Further, when the inner diameter of the pipe 8 and the inner diameter of the measuring pipe of the electromagnetic flowmeter are different, a step is formed at the connecting portion between the pipe and the electromagnetic flowmeter (mounting member), and when this step is large, There is a problem that the accuracy of the flow rate measurement is deteriorated due to a foreign substance being caught and clogged or the flow velocity distribution is changed due to a step, and thus the accurate flow rate measurement cannot be performed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electromagnetic flow meter mounting device which can solve such problems.

[0008]

In order to achieve the above object, an electromagnetic flowmeter mounting device according to claim 1 has an electromagnetic flowmeter (1) mounted on a mounting member (2) fixed to the electromagnetic flowmeter (1). )
And a cylindrical insertion portion (21) having an outer diameter that is concentric with the measuring tube of (1) and fits into the inner diameter of the conduit (8) to which the electromagnetic flowmeter (1) is to be mounted. .

According to a second aspect of the present invention, in the electromagnetic flowmeter mounting device according to the first aspect, the cylindrical insertion portion (21) is provided.
It is characterized in that the inner circumference of is formed as a smooth reduction tube which is reduced as it approaches the downstream electromagnetic flow meter measurement tube.

The invention according to claim 3 is the same as claim 1.
Alternatively, in the electromagnetic flowmeter mounting device according to 2, the mounting member (2) as a whole has a plate shape substantially perpendicular to the axis of the measuring tube of the electromagnetic flowmeter (1), and a plurality of bolt holes ( 2c) is formed.

[0011]

According to the first aspect of the invention, the electromagnetic flowmeter (10) is positioned by fitting the cylindrical insertion portion (21) into the inner diameter of the conduit (8), and the electromagnetic flowmeter (1) is positioned. The axis of the measuring tube and the axis of the conduit (8) are aligned.

According to the second aspect of the present invention, even if the diameter of the electromagnetic flowmeter (1) is significantly smaller than the inner diameter of the pipe line (8), no step is formed at the connection portion, so that the flow velocity distribution is badly changed. Does not occur.

According to the third aspect of the present invention, when the electromagnetic flowmeter (1) is installed in the manhole, the bolt holes in the plate-like portion of the mounting member (2) are utilized to make the electromagnetic flow on the wall surface of the manhole. The flow meter can be fixed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram of a first embodiment showing the basic construction of the present invention. FIG. 1 (a) is a partially vertical plan view with a part cut horizontally, and FIG. It is a perspective view of a member.

In FIG. 1, reference numeral 1 denotes an electromagnetic flowmeter for non-full water, which is, for example, an electromagnetic flowmeter disclosed in Japanese Patent Application Laid-Open No. 5-223605. Reference numeral 2 is a substantially plate-shaped mounting member, and front and rear sides of the drawing are provided with oblique bent portions 2a and 2b on the rear side. Each of the bent portions 2a and 2b is provided with three bolt holes 2c.

Reference numeral 21 is a thin-walled cylindrical insertion portion integrally fixed to the plate-shaped portion of the mounting member 2 by welding so that the axis center is at a right angle, and its outer diameter fits the inner diameter of the sewer pipe line 8. The size is set to be slightly smaller than the inner diameter of the inside of the pipe 8 so as to fit with. 7 is a manhole wall.

The mounting member 2 having the insertion portion 21 is fixed in advance to the inlet side (left end in the drawing) of the electromagnetic flowmeter 1 by an appropriate means so that the insertion portion 21 and the measuring tube are concentric.

To mount the electromagnetic flowmeter 1 in the manhole, the insertion portion 21 is inserted from the open end (right end in the figure) of the conduit 8, and the six anchor bolts 11 embedded in the manhole wall 7 are attached to the mounting member 2. The bolt hole 2c is fitted and the bent portions 2a and 2b of the mounting member 2 are brought into contact with the manhole wall 7,
The electromagnetic flow meter 1 is mounted and mounted by fixing the mounting member 2 to the manhole 7 with six nuts 12.

By doing so, the measuring tube of the electromagnetic flowmeter is arranged concentrically with the conduit 8. The weight of the electromagnetic flow meter 10 is maintained by the six anchor bolts 11. 2 and 3 show a second embodiment of the present invention.

In both of these figures, the same reference numerals as those in the prior art of FIGS. 9 and 10 and the first embodiment of FIGS. 1 and 2 are the same as those of the prior art and the first embodiment. Since this is a structure that operates, description thereof will be omitted.

In the second embodiment, a thin cylindrical insertion portion 21 is integrally welded to the center of the plate-like portion of the mounting member 3 as in the case of the first embodiment. A circular hole having the same diameter as the inner diameter of the measuring tube of the flowmeter 1 is concentrically formed in the plate-shaped center of the mounting member 3, which is the same as in the above-mentioned conventional technique and the first embodiment.

The electromagnetic flowmeter 1 is fixed between the mounting member 2 and the flange 3 by four bolts 4 and four nuts 5. Then, in order to mount and install the electromagnetic flow meter 1 in the manhole, first, the insertion portion 21 is fitted from the downstream open end of the pipe line 8, and the mounting member 2 is attached to the manhole wall 7 by the six bolts 6 of the conventional technique. By fixing as in the case,
The electromagnetic flow meter 1 is installed in the manhole.

FIG. 4 shows a third embodiment of the present invention, which is shown in FIGS.
Since the shape of the mounting member 2 is different from that of the second embodiment described above, only different points will be described. In the third embodiment, the plate-shaped portion 2d of the mounting member 2 has a donut-shaped disc shape, and the thin-walled cylindrical insertion portion 21 is welded to the center thereof. Then, the first portion is formed on the plate-shaped portion 2d.
It does not have the bolt holes 2c as in the embodiment and the second embodiment.

In the third embodiment, in order to install the electromagnetic flow meter in the manhole, the insertion portion 21 is inserted into the downstream open end of the pipe 8 and positioned. As a fixing means,
This is performed by press-fitting or adhering the insertion portion 21 to the inner circumference of the pipe line 8.

This third embodiment can also be used when the electromagnetic flowmeter is installed not in the manhole but in the middle of the sewer pipe. At that time, the donut-shaped disc portion of the mounting member 2 is placed outside. It is better to reduce the diameter to the minimum required diameter.

FIGS. 5 and 6 show a fourth embodiment of the present invention, which is different from the second embodiment shown in FIGS. 2 and 3 in that the plate-like portion of the mounting member 2 and the electromagnetic flow rate to the mounting member 2 are compared. Since the fixed structure of the meter is different, this difference will be mainly described.

In this embodiment, the plate-shaped portion of the mounting member 2 has a quadrangular outer shape and is provided with bolt holes through which four mounting bolts 6 are inserted. The electromagnetic flowmeter 1 is positioned concentrically with the insertion portion 21 by fitting it to the three guides 2e formed on the plate-shaped portion of the mounting member 2, and the buckle 13 provided on the mounting member 2 and the electromagnetic flowmeter 1 is fitted. Is fastened to the mounting member 2 so as to be detachable.

Therefore, in this fourth embodiment, the insertion portion 21 is inserted into the pipe line 8 and the attachment member 2 is attached to the four bolts 6.
Even after being fixed to the manhole wall with, the electromagnetic flow meter 10 can be removed by loosening the buckle 13 as needed.

In FIG. 6, 14 is a nut embedded in the manhole wall 7, and the mounting member 2 is fixed to the manhole by screwing the bolt 6 into the nut 16 and tightening.
Reference numeral 15 indicates sewage flowing from the pipe 8 through the electromagnetic flow meter 1 and flowing down.

FIG. 7 shows a fifth embodiment of the present invention, which is a mounting member 2
The inner diameter of the cylindrical insertion part 21 provided in the
It has a tapered shape that gradually shrinks according to the inner diameter of the measuring tube.

That is, the wall thickness of the upstream end (left end in the drawing) of the insertion portion 21 is extremely thin, and the inner diameter becomes smaller and the wall thickness increases toward the downstream side (right side in the drawing). And
At the right end, a smooth tapered shape is formed so that the inner diameter of the measuring pipe of the electromagnetic flowmeter 1 is the same as the inner diameter.

By doing so, even if the inner diameter of the conduit 8 and the inner diameter of the electromagnetic flow meter are different, no step is formed in the flow path connecting portion, and therefore the flow velocity distribution does not change and the accuracy of flow rate measurement is not adversely affected.

FIG. 8 shows a comparison of the instrumental difference characteristics of the electromagnetic flowmeter between the case of the embodiment of FIG. 5 and the case of the prior art. The horizontal axis represents the water level of the fluid flowing in the non-full state by the ratio of the diameter D of the electromagnetic flow meter. The vertical axis is the instrumental error.

In broken line (a), the inner diameter of the pipe line 8 is 250 mm, the inner diameter (caliber) D of the measuring pipe of the electromagnetic flowmeter is 240 mm, and the insertion portion 21 is a reduction pipe as in the fifth embodiment of FIG.
It can be seen from the instrumental difference diagram in the case of providing the above that the improvement is made compared with the case of the prior art of broken line B.

In the prior art, the instrumental error characteristic is deteriorated like a broken line due to the change of the flow velocity distribution due to the step difference of the flow path connecting portion, but in the present invention, the inner diameter of the insertion portion 21 is smooth. To the electromagnetic flowmeter 1 from the inner diameter of the pipe 8.
This is because the inner diameter of the measuring tube was continuously changed.

[0036]

Since the electromagnetic flowmeter mounting device of the present invention is configured as described above, it becomes easy to align the electromagnetic flowmeter with a pipe, especially a sewer pipe flowing into a manhole, Wearing time can be shortened.

According to the second aspect of the present invention, when the diameter of the conduit (8) and the electromagnetic flowmeter (1) are significantly different, there is no step at the joint of the flow passage, and the diameter of the flow passage is smoothly reduced. Therefore, the flow distribution does not change. Therefore, there is no possibility of adversely affecting the measurement accuracy of the electromagnetic flow meter.

In the third aspect of the present invention, the concentricity of the conduit (8) and the electromagnetic flowmeter (1) can be easily positioned, the flow distribution is not changed, and the weight of the electromagnetic flowmeter is bolted to the manhole wall. Can be supported by.

[Brief description of drawings]

FIG. 1 is a partially vertical plan view in which a part is horizontally cut, and FIG. 1B is a perspective view of a mounting member in a first embodiment of the present invention.

FIG. 2 is a perspective view of a second embodiment of the present invention.

FIG. 3 is a partially longitudinal side view of the second embodiment of the present invention.

FIG. 4 is a perspective view of a third embodiment of the present invention.

FIG. 5 is a perspective view of a fourth embodiment of the present invention.

FIG. 6 is a partially longitudinal side view of the fourth embodiment of the present invention.

FIG. 7 is a partially longitudinal side view of the fifth embodiment of the present invention.

FIG. 8 is an instrumental difference diagram between a fifth embodiment of the present invention and a conventional technique.

FIG. 9 is a partially longitudinal plan view in which a part of the conventional technique is horizontally cut.

FIG. 10 is a perspective view of a conventional technique.

[Explanation of symbols]

 1 Electromagnetic flow meter 2 Mounting member 2c Bolt hole 21 Insertion part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Furukawa 1-270, Sennen 1-chome, Atsuta-ku, Nagoya-shi, Aichi Aichi Clock Electric Co., Ltd.

Claims (3)

[Claims] 1. A pipe line (8) concentric with the measuring pipe of the electromagnetic flow meter (1) and to which the electromagnetic flow meter (1) should be mounted, on a mounting member (2) fixed to the electromagnetic flow meter (1). An electromagnetic flowmeter mounting device comprising a cylindrical insertion portion (21) having an outer diameter fitted to the inner diameter of the. 2. The electromagnetic flow rate according to claim 1, wherein the inner circumference of the cylindrical insertion portion (21) is formed as a smooth reduction tube which is reduced as it approaches the downstream electromagnetic flow meter measurement tube. Total. 3. The mounting member (2) as a whole has a plate shape substantially perpendicular to the axis of the measuring tube of the electromagnetic flowmeter (1), and a plurality of bolt holes (2c) are formed in this plate-shaped portion. The electromagnetic flowmeter mounting device according to claim 1 or 2, characterized in that: