JPH09119856A - Electromagnetic flow meter detector for non-full water - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To be able to correct even a large twist around a tube axis of a detector body which causes a measurement error. SOLUTION: An earth ring for contacting a fluid to be measured is attached to an end portion of a measuring pipe 15, electrodes 16 are attached to a lower portion of the measuring pipe 15, and exciting coils are provided on both outer sides of the measuring pipe 15 in a horizontal direction. Is a magnetic flowmeter detector for non-filled water, which detects the potential difference between the electrode 16 and the earth ring. The electromagnetic flowmeter detector for non-full water is mounted and fixed by sandwiching both ends of the detector body 10 including the measuring pipe 15 between the mating pipes 11 and 12 and pressing the detector body 10 from both sides thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic flowmeter detector capable of measuring a fluid to be measured in a non-full state, and particularly, it is necessary to correct a twist in a circumferential direction with respect to a pipe axis when connecting to a pipe. An electromagnetic flow meter detector for full water.

[0002]

2. Description of the Related Art FIG. 4 shows a configuration example of a flange type electromagnetic flowmeter detector for measuring a fluid to be measured in a non-full state. In the flange type electromagnetic flowmeter detector shown in the figure, an electrode 2 is installed below a measuring tube 1 made of a non-magnetic metal pipe so that it can come into contact with a fluid to be measured, and a magnetic field is applied horizontally to the fluid to be measured. In order to do so, a pair of exciting coils 3 are arranged horizontally outside the measuring tube 1. A coil core 4 is provided between the left and right exciting coils 3, and a main body cover 5 also serving as a feedback magnetic path is provided outside the exciting coil 3.

An electromotive force generated by horizontally applying a magnetic field from the exciting coil 3 to the fluid to be measured is detected by the differential amplifier 6 as a potential difference between the electrode 2 and the earth ring, and the detection signal is transmitted from the transmission circuit 7. It is configured to transmit to the converter. In the flange type electromagnetic flowmeter detector, flanges are integrally formed at both ends of the measuring pipe 1. A large number of bolt holes are concentrically formed on the detector-side flange.

On the other hand, the piping line in which the electromagnetic flowmeter detector is installed is constructed by connecting a plurality of piping. Flanges 8 as shown in FIG. 5 are formed on both ends of each pipe, and bolt holes 9 are formed concentrically on the pipe-side flange 8. The bolt holes 9 of the flange 8 on the piping side are overlapped with each other and the bolts are fixed. Similarly, when installing a flange type electromagnetic flowmeter detector between two pipes, the bolt hole 9 of the pipe side flange 8 and the bolt hole of the detector side flange are piled up and the bolts are passed through and tightened with a nut. I am trying.

According to the electromagnetic flowmeter detector constructed as described above, it is possible to detect a signal corresponding to the water level and the flow velocity of the fluid to be measured even when the fluid to be measured is not full. By the way, the diameter of the bolt hole provided in the pipe flange 8 of the existing pipe is larger than the bolt diameter, and the gap to be secured between the bolt inserted in the bolt hole 9 and the bolt hole 9 is defined by the flange standard. There is. For example, the bolt hole diameter is set to be 3 mm larger than the bolt diameter.

For this reason, in the existing pipes, the pipes connected to each other may be twisted around the pipe axis to be connected. FIG. 5 shows the amount of twist when the pipe is twisted around the pipe axis and connected because the bolt hole diameter of the pipe flange 8 is 3 mm larger than the bolt diameter.
This amount of twisting accumulates in a long piping line, so when piping work with a flange type non-filling electromagnetic flowmeter detector installed between pipes, only a 3 mm gap between the bolt diameter of the piping flange and the bolt diameter accumulated. It may not be possible to correct the twist.

However, if the electromagnetic flowmeter detector for non-full water is arranged between the pipes in a twisted state, there is a problem that a measurement error occurs. As described above, in the non-full-water electromagnetic flowmeter detector, a pair of left and right exciting coils are horizontally arranged outside the measuring tube. When the detector is in a twisted state as shown in FIG. 6, when the fluid to be measured flows in a non-full state in the magnetic field created by the exciting coil, the left-right uniformity with respect to the electrodes is lost. Thus, when a laterally non-uniform magnetic field is applied to the fluid to be measured centering on the electrodes, the electromotive force corresponding to the loss of uniformity appears as a measurement error.

[0008]

As described above, the conventional flange type non-filling electromagnetic flowmeter detector has a problem that when the amount of twist of the pipe connecting portion is accumulated in a long piping line, the electromagnetic flowmeter detector At the installation location, the accumulated twist cannot be corrected only by the gap of 3 mm between the bolt hole diameter of the piping flange and the bolt diameter, so that a measurement error depending on the twist amount may occur.

The present invention has been made in view of the above circumstances, and the electrode at the bottom of the measuring pipe can be rotated and fixed to the vertical position even if the mating pipe is largely twisted, which causes the measurement error. It is an object of the present invention to provide an electromagnetic flowmeter detector for non-full water, which can be corrected even if the twist around the tube axis of the detector body becomes large.

[0010]

In order to achieve the above object, the present invention takes the following measures. According to the present invention, which corresponds to claim 1, an earth ring which is in contact with a fluid to be measured is attached to an end portion of a measuring pipe, electrodes are attached to a lower portion of the measuring pipe, and both outer sides in the horizontal direction of the measuring pipe are attached. An electromagnetic flowmeter detector for non-full water, in which an exciting coil is arranged and which has a potential difference detecting means for detecting a potential difference between the electrode and the earth ring, and the both ends of the detector main body including the measuring pipe are connected between the mating pipes. The detector body is sandwiched and pressed from both sides to be attached and fixed.

According to the present invention, since the detector main body is mounted and fixed between the mating pipes without using a fastening member or the like, the position of the bolt hole formed in the flange on the mating pipe side is not limited and the detection is performed. When connecting the pipe of the main body, the main body of the detector can be freely rotated around the pipe axis.

According to the present invention corresponding to claim 2, an earth ring for contacting a fluid to be measured is attached to an end portion of the measuring pipe, an electrode is attached to a lower portion of the measuring pipe, and a horizontal direction of the measuring pipe is provided. An electromagnetic flowmeter detector for non-full water, in which exciting coils are arranged on both outer sides and which has a potential difference detecting means for detecting a potential difference between the electrode and the earth ring, and flanges are provided at both ends of a detector body including the measuring tube. A bolt hole corresponding to the bolt hole of the pipe side flange provided at the end of the mating pipe on this detector side flange, and make the bolt hole of the detector side flange larger than the specified size of the flange standard. , Bolts are inserted into both bolt holes of the flange on the pipe side and the flange on the detector side overlapped with each other to connect the pipes.

According to the present invention, since the bolt hole of the detector side flange is made larger than the prescribed size of the flange standard, both the bolt holes of the pipe side flange and the detector side flange are overlapped with each other and the bolt is inserted to connect the pipe. In doing so, the detector main body can be rotationally adjusted to a greater extent than the conventional type, and a larger twist than before can be corrected and mounted.

According to the present invention corresponding to claim 3, an earth ring for contacting a fluid to be measured is attached to an end portion of the measuring pipe, an electrode is attached to a lower portion of the measuring pipe, and the measuring pipe is arranged in a horizontal direction. An electromagnetic flowmeter detector for non-full water, in which exciting coils are arranged on both outer sides and which has a potential difference detecting means for detecting a potential difference between the electrode and the earth ring, and flanges are provided at both ends of a detector body including the measuring tube. A bolt hole corresponding to the bolt hole of the pipe side flange provided at the end of the mating pipe is formed on this detector side flange, and the bolt hole of the detector side flange is circled around the pipe axis. The holes are elongated in the direction, and the bolts are inserted into both bolt holes of the pipe-side flange and the detector-side flange that are overlapped with each other to connect the pipes.

According to the present invention, since the bolt holes of the detector side flange are elongated in the circumferential direction about the pipe axis, the bolt holes of the pipe side flange and the detector side flange are overlapped with each other. When connecting a pipe through a bolt, the detector main body can be rotated and adjusted more largely than the conventional type, and even a twist larger than in the past can be corrected and fixed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. (First Embodiment) FIG. 1 (a) shows a pinch type non-filling electromagnetic flowmeter detector according to the first embodiment (hereinafter referred to as "pinch type detector") arranged in a piping line. It shows the state. In the figure, 10 is the detector body,
Reference numeral 11 is a mating pipe (left mating pipe) connected to the left side of the detector body 10, and 12 is a mating pipe (right mating pipe) connected to the right side of the detector body 10.

The mating pipes 11 and 12 are the same as the conventional pipes used also in the flange type electromagnetic flowmeter detector. That is, the flanges 13L and 13R are integrally formed at the pipe ends of the mating pipes 11 and 12, and the flange 13
In L and 13R, bolt holes 14 are formed at regular intervals on the same circumference that is away from the tube axis by a predetermined amount.

The sandwich type detector according to the present embodiment is a detector body 10 for detecting an electromotive force generated in a fluid to be measured.
And a signal transmission unit (not shown) for transmitting the detection signal to the converter.

The detector main body 10 has a measuring tube 15 having a cylindrical shape with no flanges formed at both ends, and an electrode 16 provided on the lower inside of the measuring tube 15 so as to be in contact with the fluid to be measured. A pair of exciting coils arranged on both the left and right outside of the measuring tube 15 so that a magnetic field can be uniformly applied to the fluid to be measured flowing in the measuring tube 15 from the left and right, and an exciting current is applied to the exciting coils. Excitation circuit to supply,
The measuring tube 15 is composed of grounding rings provided at both ends of the measuring tube 15, a main body cover also serving as a feedback magnetic path between the grounding ring and the electrode 16.

The measuring pipe 15 is sandwiched between the flange 13R of the right mating pipe 12 and the flange 13L of the left mating pipe 11. Pipe axis of the measuring pipe 15 inserted between the right side mating pipe 12 and the left side mating pipe 12 and the mating pipes 11 and 12
The straight line L passing through the electrode 16 of the measuring tube 15 and the center of the measuring tube is made vertical so as to be sandwiched. Then, through the corresponding bolt holes of the flanges 13 of the right side mating pipe 12 and the left side mating pipe 11, through bolts 17
And the nuts 18R and 18L screwed into the bolt tips protruding outwardly from both flanges 13 are screwed into the detector side, whereby the right side mating pipe 12 and the left mating pipe 11 are inserted.
The measuring tube 15 sandwiched between is fixed.

In the sandwich type detector constructed as described above, the detector main body 10 inserted between the right side mating pipe 12 and the left side mating pipe 11 is centered on the pipe axis so that the electrode 16 is in the vertical position. Will be rotated. At this time,
As shown in FIG. 1B, it is assumed that the mating pipe 11 is twisted to the extent that it cannot be corrected by a 3 mm gearup from its original position due to the pipe connection. However, since the present embodiment is not a method of fixing bolts through the bolt holes of the piping side flange and the bolt holes of the detector side flange, there is no restriction on the position of the bolt holes of the piping side flange, and the detector body The electrode 16 can be brought to a vertical position by rotating 10. After the detector body 10 is properly positioned, the left and right pipe side flanges 13R and 13L are threaded through the bolts 17 and the nuts 18R and 18L, and the left and right pipe side flanges 13R and 13L are used to detect the detector body 1.
Insert both ends of 0 toward the inside and fix.

As described above, according to the present embodiment, since the cylindrical detector body 10 is sandwiched and fixed between the pipe side flanges 13R and 13L, the pipe side flange 1
Detector body 1 regardless of the positions of the 3R and 13L bolt holes
0 can be fixed, and the detector body 10 can be rotationally adjusted as needed. Therefore, the pipe side flange 13R,
The detector main body 10 fixed between 13L can be always attached in a preferable state, and the measurement error due to the non-uniform magnetic field applied to the fluid to be measured can be prevented.

(Second Embodiment) FIG. 2A shows a flange type non-filled electromagnetic flowmeter detector (hereinafter referred to as "flange type detector") according to a second embodiment in a piping line. It is shown in the state of being arranged at. The mating pipes 11 and 12 are the same as the pipes shown in FIG.

This flange type detector is composed of a detector body 20 for detecting the electromotive force generated in the fluid to be measured and a signal transmission unit (not shown) for transmitting the detection signal to the converter. There is.

The detector main body 20 comprises a measuring tube 21 having flanges integrally formed at both ends of a cylindrical body, and a first measuring tube 21.
Other components similar to those of the embodiment (electrode 16, exciting coil, exciting circuit, earth ring, body cover also serving as feedback magnetic path, etc.).

The flanges (detector side flanges) 22L and 22R formed at both ends of the measuring pipe 21 are mating pipes 1
The pipe side flanges 13L and 13R of 1 and 12 are designed to have the same dimensions, and the same number of bolt holes 23 are formed at the same positions as the bolt holes of the pipe side flanges 13L and 13R.

Here, the detector side flanges 22L, 22R
The bolt hole 23 is made larger than the hole size defined in the flange standard, thereby increasing the gap between the bolt hole 23 and the bolt to increase the degree of freedom in positioning.

The measuring pipe 21 is inserted between the flange 13R of the right mating pipe 12 and the flange 13L of the left mating pipe 11. A state in which the pipe axis of the measuring pipe 21 inserted between the right side mating pipe 12 and the left side mating pipe 11 is aligned with the pipe axes of the mating pipes 11 and 12, and the electrode 16 of the measuring pipe 21 is arranged in a vertical position. It is fixed at. The fixing method is the same as that of the conventional flange type electromagnetic flowmeter detector. That is, the bolt 24 is inserted from the pipe side flange so that the bolt holes of the pipe side flanges 13L and 13R and the corresponding bolt holes 23 of the detector side flanges 22L and 22R are overlapped with each other, and the bolt tip protruding to the detector side flange. 2 nuts
5 is screwed and fixed.

Here, the range in which the detector body 20 can be rotated in order to dispose the electrode 16 in the vertical position is within the bolt holes of the pipe side flanges 13L and 13R and the detector side flange 22.
This is a region where the bolt holes 23 of L and 22R overlap in a range wider than the bolt diameter. In the present embodiment, since the hole diameter of the bolt hole 23 is made larger than the hole size defined in the flange standard, the degree of freedom for rotating the detector body 20 is correspondingly increased.

As described above, according to the present embodiment, since the hole diameter of the bolt holes 23 of the detector side flanges 22L and 22R is made larger than the hole size defined in the flange standard, the detector main body 20 is It has a large degree of freedom of rotation, and a larger twist than before can be corrected when fixing the detector body 20 in a preferable state.

(Third Embodiment) FIG. 3 shows a partial structure of a flange type detector according to a third embodiment.
The basic configuration of this embodiment is the same as that of the above-described second embodiment, and the different part is the detector-side flange 22.
This means that the L and 22R bolt holes are elongated holes.

As shown in FIG. 3, the detector side flange 22
The L and 22R bolt holes are elongated holes 30 elongated in the circumferential direction. The long hole 30 is set to have a dimension such that the major axis in the circumferential direction is larger than the minor axis in the radial direction. Therefore, when the detector main body is rotated around the tube axis to perform the positioning in the vertical position, the twist can be corrected within the range of the elongated hole 30 in the circumferential direction.

According to this embodiment, since the bolt holes of the detector side flanges 22L and 22R are elongated holes 30 which are long in the circumferential direction, the degree of freedom for rotating the detector main body is increased, which is larger than the conventional one. Even large twists can be fixed. The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0034]

As described above in detail, according to the present invention, even if the twisting of the mating pipe is large, it can be fixed by rotating it to the vertical position of the electrode at the bottom of the measuring pipe, which causes a measurement error. It is possible to provide an electromagnetic flowmeter detector for non-full water that can correct even a large twist around the tube axis of the main body of the device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a sandwiching type detector according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a flange type detector according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a flange portion of a flange type detector according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of an electromagnetic flow meter detector for non-full water.

FIG. 5 is a diagram showing a twist of a pipe connection.

FIG. 6 is a view showing a non-full-water electromagnetic flowmeter detector in which the detector body is fixed in a twisted state.

[Explanation of symbols]

10 ... Detector main body, 11 ... Left side mating pipe, 12 ... Right side mating pipe, 13R, 13L ... Piping side flange, 14 ... Bolt hole, 15 ... Measuring pipe, 16 ... Electrode, 17 ... Through bolt,
18R, 18L ... Nuts.

Claims (3)

[Claims] 1. An earth ring, which comes into contact with a fluid to be measured, is attached to an end of the measuring tube, electrodes are attached to the lower part of the measuring tube, and exciting coils are arranged on both outer sides in the horizontal direction of the measuring tube. A non-filling electromagnetic flowmeter detector having a potential difference detecting means for detecting a potential difference between the electrode and the earth ring, wherein both ends of a detector main body including the measuring pipe are sandwiched between mating pipes. An electromagnetic flowmeter detector for non-filled water, characterized in that the main body is attached and fixed by pressing it from both sides. 2. An earth ring, which comes into contact with the fluid to be measured, is attached to the end of the measuring tube, electrodes are attached to the lower part of the measuring tube, and exciting coils are arranged on both outer sides in the horizontal direction of the measuring tube. A magnetic flowmeter detector for non-full water having a potential difference detection means for detecting a potential difference between the electrode and the earth ring, wherein flanges are provided at both ends of a detector main body including the measurement tube,
On this detector side flange, form a bolt hole corresponding to the bolt hole of the pipe side flange provided at the end of the mating pipe,
The bolt hole of the detector side flange should be larger than the specified size of the flange standard, and even if there is axial misalignment or twisting of the pipe, it is possible to connect the pipes by inserting bolts into both bolt holes of the pipe side flange and the detector side flange that overlap each other. An electromagnetic flow meter detector for non-filled water. 3. An earth ring, which comes into contact with the fluid to be measured, is attached to the end of the measuring tube, electrodes are attached to the lower part of the measuring tube, and exciting coils are arranged on both outer sides in the horizontal direction of the measuring tube. A magnetic flowmeter detector for non-full water having a potential difference detection means for detecting a potential difference between the electrode and the earth ring, wherein flanges are provided at both ends of a detector main body including the measurement tube,
On this detector side flange, form a bolt hole corresponding to the bolt hole of the pipe side flange provided at the end of the mating pipe,
Both the bolts on the pipe side flange and the detector side flange that overlap each other even if there is axial misalignment or twisting of the pipe by making the bolt hole of the detector side flange a long hole in the circumferential direction around the pipe axis. An electromagnetic flowmeter detector for non-filled water, which can be connected by piping through a bolt in the hole.