JPS631216Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic flowmeter, and in particular, is provided between flanges on the upstream and downstream sides of a mating pipe that sends a fluid to be measured, and an exciting current is supplied to adjust the flow rate of the fluid to be measured. The present invention relates to an integrated electromagnetic flowmeter in which a transmitter section that outputs a corresponding flow rate signal and a converter section that has a converter circuit that processes and outputs the flow rate signal from the transmitter section are integrally formed.

Historically, electromagnetic flowmeters have been separated into a transmitter that detects a flow rate signal and a converter that processes and outputs the flow rate signal detected by this transmitter. It was connected by a cable.

In contrast, relatively recently, integrated electromagnetic flowmeters have been developed that have an unprecedented configuration in which the transmitter is sandwiched between the flanges of the mating piping in a sandwich-like manner and the converter is mounted on top of the transmitter. Summer.

Next, this type of electromagnetic flowmeter is shown in FIG. 1, and will be explained.

FIGS. 1a and 1b show a front view and a side view of an electromagnetic flowmeter constructed by integrally combining a transmitter section and a converter section.

The transmitter section 7 has an excitation coil (not shown) that applies a magnetic field to the measuring fluid flowing in the conduit, and sends a flow rate signal corresponding to the flow rate of the measuring fluid to the converter section 1.

Further, the converter section 1 processes the weak flow rate signal from the transmitter section 7, converts it into a signal corresponding to the flow rate, such as a unified current signal or a pulse train signal, and sends this signal to the outside.

A bottom part 2 of a converter part casing made of cast metal or the like is attached to the upper part of a transmitter part casing 8, which forms the casing of the transmitter part 7, with screws 6 at several places, and the top of this bottom part 2 is a lid. Covered by 3.

In the converter section 1, a lead wire drawn out from the transmitter section 7 is relayed by a relay terminal board 5, and a signal is processed by a printed board 4.

By the way, this type of electromagnetic flowmeter shown in Figure 1 has a structure in which the transmitter part is fixed to the pipe using the flange of the mating pipe, so the size of the transmitter part is small and the advantage is that it has a compact configuration. There is.

However, when connecting the oscillator section and the converter section, the conventional converter is simply placed on top of the oscillator, and there are no problems caused by placing the converter on top of the oscillator. no consideration is given.

Therefore, we investigated the drawbacks of an integrated electromagnetic flowmeter in which the transmitting part and the converting part are integrated and installed on piping, and the following problems were found.

If you use a configuration in which the transmitter section with the converter section placed on top is sandwiched between them using the flange of the mating piping, the dimensions of the converter section will be relative to the compact transmitter section. become larger. This tendency is particularly remarkable in small-diameter electromagnetic flowmeters.

On the other hand, when the transmitter section is attached to piping next to a wall, it may be installed close to the wall at the limit of the maximum dimension of the integrated electromagnetic flowmeter without connecting the wiring cable. In this case, if the integrated electromagnetic flowmeter is of small diameter, it is installed in the piping using the maximum dimension of the converter section as an indicator so that it does not hit the wall. For this reason, there may be cases where external wiring cannot be done after installation in the piping due to lack of wiring space.

This invention focuses on this point, and in order to solve this problem, it is fixed between the flanges on the upstream and downstream sides of the mating piping that sends the fluid to be measured, and outputs a flow rate signal corresponding to the flow rate of the fluid to be measured. In an integrated electromagnetic flowmeter in which a transmitter section that processes the flow rate from the transmitter section and a converter section that processes and outputs the flow rate from the transmitter section are integrally formed, the dimensions of the converter section housing of the converter section are the same as those of the transmitter section. It is formed larger than the dimensions of the transmitter part housing of the converter part, and has a wiring outlet for external wiring connecting between the converter part and external equipment on the side of the converter part housing, and a transmitter part housing in the lower part. and connecting members for connecting these housings to the fitting portions are provided at equal intervals on the same circumference, and these connecting members connect the converter housing to the transmitter housing. It is connected so that it can rotate relative to the body.

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

The integrated electromagnetic flowmeter of this example is shown in Figure 2 a, b,
Shown in c. FIG. 2a is a plan view of the converter section with the lid 33 removed, FIG. 2b is a schematic front view of the integrated electromagnetic flowmeter showing the converter section in section, and FIG. 2c is a schematic front view of the integrated electromagnetic flowmeter. FIG. 7 is a plan view showing the bottom of the converter section housing with each unit in the converter section removed.

In the integrated electromagnetic flowmeter, the upper part of the transmitter housing 11 is formed into a cylindrical shape, and lead wires 12a and 12b connected to electrodes (not shown) are taken out from the upper part. On the other hand, a cylindrical recess, ie, a fitting part 15, is formed at the bottom of the converter housing 14 and is large enough to fit into which the upper part of the transmitter housing 11 fits.
A hole 16 for taking out the lead wire is provided in the center of this fitting portion 15, and four coupling holes (not shown) are bored around this hole 16 at equal intervals on the same circumference. The transducer unit housing 14 is screwed to the transmitter unit housing 11 by a coupling screw 17 through this hole. In other words, the converter unit housing 14 and the transmitter unit housing 11 are connected to each other by connecting screws 1 equally spaced at 90° intervals.
They are integrally connected by 7. In this case,
The depth of the fitting portion 15 is preferably as deep as possible, and is formed to such an extent that the coupling screw 17 does not touch the conversion portion printed board 24. Therefore, this increases the degree of lateral coupling of the transmitter unit housing 11 and increases the mechanical strength.

Furthermore, around the fitting part 15, there is a printed circuit board 18 for the excitation signal and the comparison signal.
and a calicon section printed board 19 for the transmitter section output signal are attached to the bottom of the converter housing 14. The printed circuit board 18 for the excitation signal and the comparison signal is equipped with a correction circuit for matching the waveform of the comparison signal to the waveform of the magnetic field applied by the oscillator section, and on the other hand, for the output signal of the oscillator section. A correction circuit is mounted on the printed circuit board 19 of the calicon section to remove noise added to the lead wire 12b for extracting the output signal from the electrode. Terminals 20a and 20b of these printed boards 18 and 19, respectively.
A lead wire 12b from an electrode (not shown) in the transmitter section 10 and a lead wire 12a from an excitation coil (not shown) are soldered to. In this case, both lead wires 12a and 12b have a flexible structure.

Furthermore, to explain the mounting structure inside the converter section 13, as shown in FIGS. It is fixed with screws 22. A converter printed board 24 equipped with a signal processing circuit and a converter printed board 25 equipped with a power supply circuit and a final signal output circuit are fixed to the mounting base 21 by fixing posts 23.
Connectors 27a and 27b are mounted on the converter printed board 24 to be connected to the connectors 26a and 26b, respectively, which are fixed to the converter printed boards 18 and 19 shown in FIG. 2c. 19 and converter printed board 24
It has a structure that allows it to be easily attached and detached. Furthermore, as shown in FIG. 2b, the mounting base 21 is mounted with a power transformer 28, heat dissipating components 29 such as transistors, and a terminal board 30 for taking out external wiring.
A wiring cable is connected to this terminal board 30, and is divided into a wiring outlet 31a for power supply and output signal.
and is taken out to the outside through 31b.

In such an integrated electromagnetic flowmeter, the converter housing 14 and the transmitter housing 11 are connected by connecting screws 17 equally spaced at 90° intervals on the same circumference. Depending on how the converter housing 14 is attached, the orientation of the wiring cables 32a, 32b may be changed to the third direction.
As shown in FIG. 3A, it can be oriented parallel to the pipeline (liquid flow direction) of the pipe 34 connected to the transmitter housing 11, or it can be oriented at right angles as shown in FIG. 3B. In other words, the converter housing 1
The direction of the wiring ports 31a and 31b of No. 4 can be changed every 90 degrees with respect to the pipeline.

In the above embodiments, the case where the fitting part has a circular cross section has been described, but the structure is not limited to this, and the fitting part and the upper part of the transmitter part housing both have a square cross section, and the structure is such that the fitting part and the upper part of the transmitter part housing are both fitted together and screwed together. to
It is also possible to change the direction in 90° increments. If you want to change the direction at a smaller angle,
The fitting part and the upper part of the transmitter housing are made into a fitting structure in which the cross section is a regular polygon, and the number of coupling screws is increased in the fitting part with a circular cross section in the previous embodiment, and these coupling screws are This can be easily achieved by creating a structure in which they are equally spaced on the same circumference.

As described above in detail with specific examples, according to the present invention, in consideration of the special characteristics of an integrated electromagnetic flowmeter in which the transmitter section is installed together with the converter section on the piping, Even when an electromagnetic flowmeter is installed and there is no wiring space, wiring can be easily done by rotating the wiring outlet without removing the integrated electromagnetic flowmeter from the piping.

In this way, it is possible to realize an electromagnetic flowmeter that combines the compactness of an integrated electromagnetic flowmeter in which the converter section is integrally coupled onto the transmitter section and the ease of wiring of a conventional electromagnetic flowmeter. It was done.

[Brief explanation of the drawing]

Figures 1a and b relate to a conventional example, Figure 1a is a plan view showing the bottom of the converter housing, Figure 1b is a front view of the integrated electromagnetic flowmeter, Figures 2a and b, Fig. 2c relates to an embodiment of the present invention, Fig. 2a is a plan view showing the mounting base of the converter unit housing, and Fig. 2b is a front view of the integrated electromagnetic flowmeter showing the converter unit in cross section. FIG. 2c is a plan view showing the bottom of the converter housing, and FIGS. 3a and 3b are explanatory views showing the direction in which the external wiring cable is taken out. In the drawing, 10 is a transmitter section, 11 is a transmitter section housing, 13 is a converter section, 14 is a converter section housing, 15
17 is a fitting part, 17 is a coupling screw, 18, 19 is a printed board for the calicon part, 21 is a mounting base, 24, 25 is a printed board for a conversion part, 26a, 26b, 27a, 2
7b is a connector, 30 is a terminal board, 31a, 31b
3 is a wiring outlet, 32a and 32b are wiring cables, and 34 is a pipe.

Claims (1)

[Scope of utility model registration request] A transmitter section that is sandwiched and fixed between flanges on the upstream and downstream sides of the mating piping that sends the measured fluid and outputs a flow rate signal corresponding to the flow rate of the measured fluid, and a transmitter section that outputs a flow rate signal corresponding to the flow rate of the measured fluid; and a converter section that is larger in size than the transmitter section housing of the transmitter section and that is provided with a wiring outlet for external wiring to connect to an external device on the side surface. In the type electromagnetic flowmeter, a fitting part with the transmitter part housing is provided at the lower part of the converter part housing of the converter part, and a connecting member for connecting these housings to the fitting part is the same. An integrated electromagnetic flowmeter characterized in that the converter part housing and the transmitter part housing are connected to each other by connecting members provided at equal intervals on the circumference.