KR20030080737A - Linerless and capsulated magnetic flow meter with electrode and exiting coil - Google Patents

Abstract

PURPOSE: An electronic flowmeter is provided to maximize the applicable range of the electronic flowmeter by forming a measuring pipe of the electronic flowmeter using magnetic or non-magnetic material. CONSTITUTION: An electronic flowmeter includes a measuring pipe(100). A pair of flanges is connected to both sides of the measuring pipe(100) in opposition to each other. The flanges are coupled to a flange provided in a pipe, thereby connecting the measuring pipe(100) to the pipe. A pair of unit connection flanges(220) is formed perpendicular to the flanges. A sensor unit coupling member is formed at an inner portion of the unit connection flange(220). A sensor unit(200) is fixedly inserted into the sensor unit coupling member. The sensor unit(200) is integrally formed with a fixing flange(230).

Description

Electronic flowmeter with no lining and integrated electrode and excitation coil {LINERLESS AND CAPSULATED MAGNETIC FLOW METER WITH ELECTRODE AND EXITING COIL}

The present invention can measure the flow rate of the fluid flowing through the pipe without lining, which is an essential component of the electromagnetic flowmeter, and at the same time, it is possible to partially replace it even when the equipment is burned out, so that the improved electrode and the excitation coil are integrated. It relates to an electronic flow meter.

In general, an electromagnetic flowmeter includes a stainless steel tube which is a non-conductive material, and two electromagnetic coils are disposed on the outer surface of the tube so as to face each other around a pipe. When magnetic magnetic field is formed and conductive fluid passes through the magnetic field, voltage is induced through the electrode. The induced electromotive force is measured and represented as a precise digital signal through amplification process and processing process. A device intended to display a value or the like.

Conventional electromagnetic flow meter is formed of a nonmagnetic material such as stainless steel, as shown in the example of Figure 1 is provided with a lining 12 of an insulating material therein, the measuring tube 10 through which the fluid is in contact with the measurement, the measurement A pair of sensing electrodes 20 disposed to face each other from the center of the tube 10 so as to face each other, an excitation coil 30 installed to surround the outer surface of the measurement tube 10, and the excitation coil And an arithmetic instruction unit 30 for supplying power to the 30 and processing and instructing a signal of the sensing electrode 20.

Thus, when the fluid flows through the excitation current by applying the excitation current to the excitation coil 30 to form a magnetic field inside the measuring tube 10, Faraday's law generates an electromotive force proportional to the flow velocity of the fluid. When the sensing electrode 20 senses the electromotive force and sends a signal to the operation instruction unit 40, the amplification is performed by multiplying the cross-sectional area of the measurement tube 10 to calculate the flow rate by integrating over a predetermined time.

However, in the conventional electron flow meter having such a structure, when the measuring tube 10 is a conductor when sensing the electromotive force, a part of the electromotive force flows to the measuring tube 10 to cause a large error in the measured amount through the sensing electrode 20. In order to prevent this, a lining 12, which is an insulating member as described above, is necessarily required, and thus, a secondary problem due to the complexity of the structure and the existence of the lining 12 is required.

That is, the lining 12 has a problem that the measuring tube 10, which is a metal material, and the temperature expansion rate are different from each other and easily cracked or separated from the wall of the measuring tube 10 by contraction or expansion due to a temperature change of a fluid or outside air; If signal electromotive force is leaked through the gap of broken lining 12, the problem causing measurement error as described above and its material is hard rubber or synthetic resin, so its strength is weak, so it is difficult to carry and handle, and it is contained in the fluid during use. The problem of shortening the service life due to abrasion due to friction with solids, and in order to replace the same, only the lining 12 could not be replaced, and thus the entire measuring tube 10 had to be replaced.

In addition, in the case of the excitation coil 30, the magnetic force line passes through the wall of the measurement tube 10 to form a magnetic field because it must be installed outside the measurement tube 10, and thus the material of the measurement tube 10 is a magnetic material. In one case, since the magnetic force line is absorbed by the measuring tube 10, the distortion of the magnetic field is caused, it is inevitably limited only to non-magnetic material such as stainless steel or aluminum, so that its use range is very limited.

In addition, if an insulating foreign material such as scale in the fluid contaminates the sensing electrode 20, the signal electromotive force is weakened, which may cause an error, so that the measuring tube 10 must be separated from the pipe in order to remove and clean it. There was this.

The present invention was created in view of the above-described problems of the prior art as described above, and can be used as a material for measuring tubes regardless of magnetic materials or nonmagnetic materials to maximize the range of use as well as lining To prevent shortening of the life span and to replace only a part of internal components quickly and easily, without providing an improved structure lining that enhances its utilization value and to provide an electromagnetic flowmeter with integrated electrodes and excitation coils The purpose is.

1 is a partially cutaway perspective view showing an example of an electronic flowmeter according to the prior art,

Figure 2 is a side cross-sectional view showing an installation state of the electromagnetic flowmeter according to the present invention,

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view of a sensor unit constituting an electronic flowmeter according to the present invention;

Figure 5 is a schematic diagram showing an operating state of the electromagnetic flowmeter according to the present invention.

Explanation of symbols on the main parts of the drawings

100: measuring tube 110: sensor unit coupling port

130: pipe connection flange 200: sensor unit

210: junction box 220: unit connection flange

230: fixed flange 250: housing

260: excitation coil 270: sensing electrode

300: operation instruction unit

The above object of the present invention is a measuring pipe having a flow path formed with a pipe connection flange to be connected to the pipe and fixed; A sensor unit coupling hole communicating with the flow path in a direction orthogonal to the flow path of the measurement tube, and having a unit connection flange formed at an outer end thereof; A sensor unit which is inserted and detachably inserted into the sensor unit coupler with a built-in excitation coil for forming a magnetic field in the flowing fluid and a sensing electrode for detecting signal electromotive force caused by the fluid flowing in the magnetic field; Electromagnetic flowmeter is integrated with the electrode and the excitation coil, characterized in that it comprises an operation instruction unit for electrically connecting to the excitation coil and the sensing electrode of the sensor unit, and at the same time receiving the signal electromotive force to calculate the flow rate By providing.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Figure 2 is a side cross-sectional view showing an installation state of the electromagnetic flowmeter according to the present invention, Figure 3 is a cross-sectional view taken along the line A-A of FIG.

2 and 3, the measuring tube 100 is provided, the pipe connecting flange 130 is formed in a direction facing each other of the measuring tube 100, the pipe connecting flange 130 is a pipe (not shown) Coupled to a flange (not shown) provided at the time) to maintain a connection relationship between the measurement tube 100 and the pipe.

A pair of unit connection flanges 220 are formed in a direction orthogonal to the pipe connection flange 130, and a sensor unit coupling hole 110 is formed at an inner diameter of the unit connection flange 220.

The sensor unit 200 is inserted into and fixed to the sensor unit coupler 110, and the sensor unit 200 is coupled to and fixed on the fixed flange 230.

Here, the unit connection flange 220 and the fixed flange 230 is preferably fastened by a bolt.

The outer circumferential surface of the measuring tube 100 is provided with a junction box 210 supported by a support 140 extended therefrom.

The junction box 210 is a place where lead wires, which are an excitation power supply connected to the sensor unit 200 and a flow signal passage, are collected and distributed, and a terminal block to which the lead wires are connected is provided.

Lead wires wired through the junction box 210 are connected to the operation instruction unit 300.

The operation instruction unit 300 may be connected to the lead wires after being provided separately, but may be detachably fixed to one side of the top surface of the junction box 210 or the outer circumferential surface of the measurement tube 100.

As shown in FIG. 4, the sensor unit 200 includes a housing 250 having a fixed flange 230 on one side, an excitation coil 260 wound and disposed inside the housing 250, and the housing 150. It comprises a pair of sensing electrodes 270 disposed in the radial direction on the front end surface of the.

The housing 250 is preferably formed of a synthetic resin material in order to have insulation as a hollow cylindrical member.

The excitation coil 260 is electrically connected to the operation instruction unit 300 described above and is disposed in the form of a solenoid.

The sensing electrode 270 penetrates through the front end surface of the housing 250 to expose a portion thereof, but is preferably spaced apart from each other in the radial direction of the housing 250.

In addition, it is particularly preferable that the hollow interior of the housing 250 is completely filled with an insulating material 280 such as an epoxy resin and then solidified after the excitation coil 260 and the sensing electrode 270 are installed.

The operating relationship of the present invention having such a configuration will be described below with reference to the above-described drawings and FIG. 5.

That is, when the excitation coil 260 of the sensor unit 200 facing the power supplied from the operation instruction unit 300 is excited, it generates a magnetic field having a magnetic field line as shown in FIG.

At this time, when the fluid, which is a conductor, flows inside the measuring tube 100, an induced electromotive force in proportion to the flow velocity is generated in the fluid by Faraday's law. Is sensed by) and transmitted to the operation instruction unit 300 through the junction box 210.

The operation instruction unit 300 calculates the received signal electromotive force by integrating the received signal electromotive force with information such as magnetic flux density and cross-sectional area stored in the storage place by a computer such as a built-in microprocessor for a predetermined time. It is possible to measure the flow rate of the fluid flowing through the c).

To summarize this formally,

In the magnetic field of magnetic flux density B, a voltage is generated between one mutually opposite electrode installed in the pipe wall such that the measuring tube having a radius d is perpendicular to the magnetic field and the flow direction so that the tube axis direction is perpendicular to the magnetic field.

In other words,

E = k B dv [V]

Where k is the natural constant of the detector depending on the magnetic field condition.

If the flow rate is Q,

therefore,

Therefore, the flow rate Q You can get it as

As described in detail above, the present invention provides the following effects.

First, there is no need for the lining in principle, the problem caused by the lining is fundamentally solved.

Second, a lining can be added to protect the measuring tube from corrosion and abrasion of the measuring fluid. In this case, even if the lining is damaged, there is no effect on the measurement accuracy.

Third, by placing the female coil in the measuring tube so that the magnetic field is not influenced by the measuring tube, there is no limitation of magnetic material and non-magnetic material in the selection of the material of the measuring tube, which is easy to manufacture and economical.

Fourth, if the electrode is contaminated or worn out, there is no need to replace the entire measuring tube, simply disassemble and clean or replace the sensor unit.

Claims (2)

A measuring tube 100 having a pipe connecting flange 130 so as to be connected to the pipe and having no flow path formed therein; A sensor unit coupler 110 communicating with the flow path in a direction orthogonal to the flow path of the measurement tube 100 and having a unit connection flange 220 formed at an outer end thereof; The excitation coil 260 that forms a magnetic field in the fluid flowing through and the sensing electrode 270 for detecting the signal electromotive force caused by the fluid flowing in the magnetic field is built-in removable in the sensor unit coupling port 110 A sensor unit 200 to be inserted; And an operation instruction unit 300 electrically connected to the excitation coil 260 and the sensing electrode 270 of the sensor unit 200 to supply power to them and receive signal electromotive force to calculate the flow rate. Electron flowmeter with no lining and integrated electrode and excitation coil. According to claim 1, wherein the sensor unit 200 is a cylindrical housing 250 which is mounted to the sensor unit coupler 110; A solenoid-type excitation coil 260 embedded in the housing 250 and installed in communication with the operation instruction unit 300; A pair of sensing electrodes 270 disposed in the radial direction to partially expose the front end surface of the housing 250 and electrically connected to the operation instruction unit 300 so as to communicate with each other; Including an insulating material 280 is filled on the inner space of the housing 250, except for the excitation coil 260 and the sensing electrode 270, there is no lining, the electrode and the excitation coil is integrated Electronic flowmeter.