JPH04186122A - Electromagnetic flow meter - Google Patents

Abstract

PURPOSE:To reduce the number of processes by internally bringing the outer circumferential surface of a ring conductor into contact with the outer circumferential surfaces of a plurality of mounting bolts, and aligning a pipeline with flange and a measuring pipe part. CONSTITUTION:The inner circumferential surface of an earth ring 6 is a liquid contact surface, and a part of the outer circumferential surface is connected to the outer circumferential surface of a measuring pipe part 1 through a conductor. The voltage between the ring 6 and an electrode for taking a measured voltage is determined to measure the flow rate of a fluid. The ring 6 has an outer diameter dimension determined so as to internally bring the cylindrical outer circumference commonly into contact with the outer circumferential surfaces of four mounting bolts 4. Thus, a pipeline 2 with flange and the measuring pipe part 1 can be precisely and rapidly aligned.

Description

[Detailed description of the invention] [Industrial application field]

The present invention particularly relates to an electromagnetic flowmeter with an alignment function that allows accurate, easy, and quick alignment of flanged piping and a measuring pipe section.

[Conventional technology]

One conventional example will be explained with reference to FIGS. 3 and 4. FIG. 3 is a side view of a conventional example, and FIG. 4 is a sectional view thereof. In these figures, the main body of the prior art example consists of a measurement tube section 1 which is a flow path for the measurement fluid, and two guide rings 11 screwed to the outer peripheral surface of the measurement tube section 1. The measurement tube section 1 has, at each end on both sides in the axial direction,
It is tightly sandwiched between the opposing surfaces of the flanges 3 of the flanged piping 2 via one earth ring 16 and two gaskets 7 (indicated by diagonal hatching) on both sides of the earth ring 16, and each flange 3 on both sides is aligned with the axis. Mounting bolt 4 that passes through parallel to
and four sets of nuts 5 are tightened and fixed. At the time of tightening, in order to make the axes of each flanged pipe 2 and the measurement pipe part 1 coaxial, that is, to align them, the outer periphery of the guide ring 11 is adjusted as shown in FIG. The positions are adjusted so that the surfaces are commonly inscribed in the outer circumferential surfaces of the four mounting bolts 4. If the alignment between each flanged pipe 2 and the measuring pipe section 1 is not accurate, the flow of fluid will be disturbed at the connecting portion between the two, and accurate flow rate measurement will be hindered. Another conventional example will be explained with reference to FIGS. 5 and 6. FIG. 5 is a side view of another conventional example, and FIG. 6 is a sectional view thereof. In these figures, the difference between the conventional example and the conventional example is that a guide ring 11 is not installed on the measuring tube section 1, but instead, two mounting holes 1 to 1 on the lower side are installed.
Two guide rings 21 are fitted into each of the four guide rings. The outer circumferential surface of the measuring tube section 1 is positioned so as to be inscribed in the outer circumferential surfaces of these two guide rings 21, and as a result, it is aligned.

[Problem to be solved by the invention]

The conventional techniques as described above have the following problems. In one conventional example, a guide ring 11 is used for aligning each flanged pipe 2 with a measuring pipe section 1 of an electromagnetic flowmeter. This guide ring 11 increases the material cost accordingly. In another conventional example, the guide rings 21 fitted into the two lower mounting holes l-4 are smaller than the guide rings 11 in the conventional example, which is advantageous in terms of cost.
There are similar difficulties as in the conventional example. Furthermore, since the guide ring 21 is separated from the measuring tube section 1 as the main body of the flowmeter, there are drawbacks such as being easily lost or forgetting to insert the mounting port 1-4. An object of the present invention is to provide an electromagnetic flowmeter with an alignment function that can easily and quickly align a flanged pipe and a measuring pipe section, while solving the problems of the conventional technology. There is a particular thing.

[Means to solve the problem]

In order to solve this problem, the electromagnetic flowmeter according to claim 1 is provided with a fluid grounding system in which a measuring pipe section as a flow path is conductively connected to the measuring pipe section at each end on both sides in the axial direction. A flow rate that is hermetically sandwiched between the opposing flange surfaces of two sets of flanged piping via an annular conductor, and is tightened and fixed by multiple mounting bolts that pass through each flange parallel to its axis. In the meter, the outer peripheral surface of the annular conductor is inscribed in common with the outer peripheral surfaces of the plurality of mounting bolts to align the flanged pipe and the measurement pipe section.

[Effect]

In the electromagnetic flowmeter according to claim 1, the outer peripheral surface of the annular conductor is inscribed in common with the outer peripheral surfaces of the plurality of mounting bolts for tightening the flanged piping, so that the flanged piping and the measuring pipe section are aligned. be done.

【Example】

Embodiments of the electric current meter and flowmeter according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the embodiment, and FIG. 2 is a sectional view thereof. In both figures, the measurement pipe section 1, which is the flow path for the measurement fluid, has one earth ring 6 at each end on both sides in the axial direction, and two gaskets 7 (hatched hatchings) on both sides. ) and flange 3 of flanged pipe 2.
The bolts are tightly clamped and fixed by four sets of mounting holes 1-4 and nuts 5, which are tightly sandwiched between opposing faces of the bolts and pass through each flange 3 on both sides in parallel to the axis. The earth ring 6 is an annular member made of stainless steel and is originally used for fluid grounding. That is,
The inner circumferential surface of the earth ring 6 becomes the liquid contact surface, and as shown in FIG. 1, the - section of the outer circumferential surface and the outer circumferential surface of the measuring tube section 1 are electrically connected by a conductive wire. By determining the voltage between the earth ring 6 and one electrode (not shown) for taking out the measurement voltage, and the voltage between the earth ring 6 and the other electrode, each of the electrodes of one and the other The voltage between them will be determined and the fluid flow rate will be measured. At the same time, the outer diameter of the earth ring 6 is determined so that its cylindrical outer circumferential surface is commonly inscribed in the outer circumferential surfaces of the four mounting bolts 4, as shown in FIG. By doing so, it is possible to insert the earth ring 6 and to align the flanged pipe 2 and the measurement pipe section 1. Note that the earth ring 6 shown in FIG.
- Ground ring 16 (third
The plate thickness is slightly thicker than that shown in Figure 5). However, this is not essential.

【Effect of the invention】

In the electromagnetic flowmeter according to claim 1, the outer peripheral surface of the annular conductor is inscribed in common with the outer peripheral surfaces of the plurality of mounting bolts for tightening the flanged piping, so that the flanged piping and the measuring pipe section are aligned. be done. Therefore, ■ Since the materials originally required for fluid grounding are used, there is no or almost no increase in material cost, ■ It is advantageous that the flanged piping and the measuring pipe can be aligned accurately on site. It can be done easily and quickly, and it can be done at the same time as the original fluid grounding work, so it has the effect of reducing the number of man-hours.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment according to the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a side view of a conventional example, Fig. 4 is a sectional view thereof, and Fig. 5 is another sectional view. A side view of the conventional example, and FIG. 6 is a sectional view thereof. Code explanation 1: Measuring pipe section, 2: Flange piping, 3: Flange,
4: Mounting bolt, 5: Oak), 6: Earth ring, 7
:gasket. Light 4 figure

Claims (1)

[Scope of Claims] 1) A measuring tube serving as a flow path is connected to two sets of flanges at each end on both sides in the axial direction via a fluid grounding annular conductor electrically connected to the measuring tube. In a flowmeter that is hermetically sandwiched between the surfaces of opposing flanges of a pipe with a pipe, and is tightened and fixed by a plurality of mounting bolts that pass through each flange in parallel with its axis, the annular conductor is An electromagnetic flowmeter characterized in that the flanged pipe and the measurement pipe portion are aligned by having an outer circumferential surface commonly inscribed in the outer circumferential surface of the plurality of mounting bolts.