JPH0536173Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic flowmeter equipped with, for example, a flangeless type measuring tube.

[Conventional technology]

In general, electromagnetic flowmeters are known to measure the flow rate of a fluid to be measured by converting it into an electrical signal using Faraday's electromagnetic induction phenomenon.

Conventionally, this type of electromagnetic flowmeter has been equipped with a flanged type measurement tube or a flangeless type measurement tube. A gasket is inserted.

[Problem that the invention attempts to solve]

By the way, this type of electromagnetic flowmeter does not have a function to position the gasket on the axis of the measuring tube, and as a result, the axis of the gasket tends to shift during installation, making the installation process complicated. In other words, if there is an axis misalignment in the gasket,
This is because turbulent flow may occur in the pipe, which may adversely affect the output during fluid measurement, or sealing performance may be reduced, resulting in liquid leakage. As a result, there is a problem in that not only does the assembly of the electromagnetic flowmeter to the connecting pipe require careful attention, but it also takes a lot of time.

The present invention was developed in view of these circumstances, and it is possible to easily and reliably install gaskets, simplifying the work of assembling instruments to the connecting piping, and shortening the time required for assembling. The purpose of the present invention is to provide an electromagnetic flowmeter that can achieve the following.

[Means for solving problems]

In the electromagnetic flowmeter according to the present invention, a gasket locking piece is attached to the electromagnetic flowmeter case by a mounting screw of a ground ring, and the mounting hole of this gasket locking piece has an opening that expands in the radial direction of the measuring tube. It is made up of long holes.

[Effect]

In the present invention, the gasket locking piece can be guided in the radial direction of the measuring tube when the gasket is attached to the case.

〔Example〕

Figures 1a and b are a side view and a sectional view showing the main parts of the electromagnetic flowmeter according to the present invention, and Figures 2a and b are a side view and a front view showing a gasket locking piece used in the electromagnetic flowmeter. be. In the figure, code 1
Items shown with are flanged on both ends (only one is shown)
2, which is housed inside a case 3 for an electromagnetic flowmeter and is held under pressure by two connecting pipes 4 (only one of which is shown). A pair of excitation coils (not shown) that form a magnetic field in a direction perpendicular to the flow direction of the fluid to be measured are provided on the outer peripheral surface of the measurement tube 1, and a pair of excitation coils (not shown) are provided on the tube wall so as to face each other via both excitation coils. A pair of electrodes (not shown) are provided at the. The inner wall surface of the measuring tube 1 and the end surface 2a of the flange 2 are covered with an insulating lining 5 made of, for example, Teflon or neoprene. Reference numeral 6 denotes an earth ring that keeps the fluid to be measured in the pipe at the same potential, and is interposed between the insulating lining 5 on the flange end surface 2a and a gasket to be described later, and is connected to the case 3 by a mounting screw 7.
Fixed. This earth ring 6 is entirely formed of a metal material such as platinum or Inconel (alloy), and has a plate thickness t.
= 0.1mm dimension. 8, which is interposed between the connecting pipe 4 and the earth ring 6. This gasket 8 is formed of an annular body made of synthetic resin such as Teflon, and its outer diameter is set to be larger than the outer diameter of the insulating lining 5 on the flange end surface 2a. Reference numeral 9 denotes a gasket locking piece for positioning, which is attached to the case 3 by the mounting screw 7, and is entirely formed of a thin metal piece that can be deformed by external force, and its plate thickness is t. is set to a dimension of t=0.3mm. This gasket locking piece 9 includes a locking portion 9a having a surface that comes into contact with a portion of the outer peripheral surface and a portion of the outer peripheral edge of the gasket 8, a ground ring escape portion 9b that covers a portion of the earth ring 6, and a mounting portion. Hole 1
The mounting hole 10 of the mounting portion 9c is constituted by a long hole having an opening extending in the radial direction of the measuring tube 1.

The gasket 8 is installed in the electromagnetic flowmeter configured as described above by attaching the gasket 8 to the measuring pipe 1 and the connecting pipe 4.
This is done by interposing it between the

That is, when installing the gasket, the gasket locking piece 9 is guided in the longitudinal direction of the installation hole 10 to adjust the amount of pressing of the gasket 8, and after it is installed on the case 3 with the installation screw 7, the two connecting pipes 4 are
This holds the measuring tube 1 inside the case 3 under pressure.

Therefore, when installing the gasket, the gasket 8 is held on the axis of the measuring tube 1 by the gasket locking piece 9.
can be installed easily and securely,
With the gasket 8 attached, the measuring tube 1 can be held under pressure by the two connecting pipes 4.

Further, in this embodiment, the gasket locking piece 9 can be attached to the case 3 using the attachment screw 7 having strict dimensional tolerances.

Furthermore, in this embodiment, since the amount of gasket pressing can be adjusted by the gasket locking piece 9, there is no need to strictly set the outer diameter of the gasket 8.

In addition, in this embodiment, since the locking portion 9a of the gasket locking piece 9 is in contact with the vicinity of the outer peripheral edge of the gasket 8, that is, the non-contact portion of the lining, the sealing performance of the gasket 8 can be maintained. .

In this embodiment, an example is shown in which the gasket locking piece 9 has a surface that contacts a part of the outer peripheral surface and a part of the outer peripheral edge of the gasket 8, but the present invention is not limited to this. As shown in FIGS. 3a and 3b, a gasket locking piece 11 having sharp teeth 11a facing inward from the outer circumferential surface of the gasket 8 can also produce the same effect as in the embodiment. In this case, the gasket locking piece 11 has two sharp teeth 11a as shown in FIGS. 4a and b, but the gasket locking piece 12 has one sharp tooth 11a as shown in FIGS. 5a and b. It may have acute teeth 12a, or it may have three or more acute teeth, and the number can be changed as appropriate.

Further, in this embodiment, a case is shown in which the gasket 8 and the gasket locking piece 9 are separate bodies, but the present invention is not limited to this, and as shown in FIGS. Gasket 1
3 and the gasket locking piece 14 may be integrated.

[Effects of the invention] As explained above, according to the invention, the gasket locking piece is attached to the electromagnetic flowmeter case by the mounting screw of the earth ring, and the mounting hole of the gasket locking piece is set to the diameter of the measuring tube. Since it is constituted by an elongated hole having an opening that widens in the direction, the gasket locking piece can be guided in the radial direction of the measuring tube when the gasket is attached to the case. Therefore, the gasket installation work can be easily and reliably performed, so that the work of assembling the instrument to the connecting pipe can be simplified and the time required for the assembling work can be shortened.

[Brief explanation of the drawing]

1A and 1B are a side view and a sectional view showing the main parts of an electromagnetic flowmeter according to the present invention; FIGS. 2A and 2B are a side view and a front view showing a gasket locking piece used in the electromagnetic flowmeter; Figure 3 a and b are the other second
Side view and cross-sectional view showing the embodiment, Figures 4a and b
are a side view and a front view showing the gasket locking piece,
Figures 5a and b are side and front views showing the gasket locking piece in another third embodiment, and Figures 6a and b are the state of attachment of the gasket locking piece to the gasket in another fourth embodiment. FIG. 2 is a cross-sectional view and a front view. 1...Measuring tube, 3...Case, 4...Connection piping, 6...Earth ring, 7...Mounting screw, 8...
...Gasket, 9...Gasket locking piece, 10...
...Mounting hole.

Claims (1)

[Scope of utility model registration request] A measuring tube housed in a case for an electromagnetic flowmeter and held under pressure by two connecting pipes via a gasket, and a screw installed between the measuring tube and the gasket and attached to the case. In the electromagnetic flowmeter, a gasket locking piece is attached to the case by the mounting screw, and a mounting hole of the gasket locking piece expands in the radial direction of the measuring tube. An electromagnetic flowmeter characterized by being composed of a long hole with an opening.