JPH0526970Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is for an electromagnetic flowmeter equipped with a tube member having a through hole for an electrode attachment part, which is bored perpendicular to the axial direction at the electrode attachment position. Regarding measuring tubes.

[Conventional technology]

Conventionally, this type of measurement tube for an electromagnetic flowmeter has been constructed as shown in FIG. To briefly explain this using the same figure, the reference numeral 1 is a metal tube member, and its inner wall 1a is made of Teflon (trade name).
The pipe member 1 is covered with a lining 2 made of an insulating material such as, and a through hole 3 for an electrode attachment part is bored in the axial center from the side of the pipe member 1, perpendicular to the axis. .

Reference numeral 4 denotes a tubular reinforcing member having a large number of through holes 4a, which is buried in the lining 2 and placed at a predetermined distance from the inner wall 1a of the tubular member 1. This reinforcing member 4 has a through hole 4b having a diameter larger than that of the through hole 4a on the same axis as the through hole 3 at a position corresponding to the through hole 3 of the tube member 1.
is drilled.

Reference numeral 5 denotes a cylindrical electrode attachment member, which is attached to the tube member 1.
The electrode mounting hole 6 is inserted into the through hole 3 for the electrode mounting portion and is welded and fixed to the outer circumferential surface of the tube member 1, and the electrode mounting hole 6 has a stepped portion 6a formed on the outside of the tube in the center thereof. is drilled. The tube inner end surface of the electrode mounting member 5, the hole wall 6b of the electrode mounting hole 6, and the stepped portion 6a are covered with the lining 2.

Reference numeral 7 denotes a cylindrical electrode having a flange 7a, which is attached to the electrode attachment hole 6 through the lining 2 so that its tip is exposed inside the pipe;
It is configured to detect the electromotive force generated at each point of the fluid to be measured. Reference numeral 8 denotes a holding plate having an insertion hole 8a in the center thereof through which the electrode 7 is inserted, and is fixed to the tube outer end surface of the electrode mounting member 5 by screws 9. A spring 10 biases the electrode 7 in the longitudinal direction, and is elastically mounted between the insulating member 11 on the flange 7a and the pressing plate 8.

Note that the reinforcing member 4 includes a large number of through holes 4.
Although the case of using one having a diameter a is shown as an example, it is also possible to use one having a net shape as a whole and thereby forming a large number of through holes.

[The problem that the idea aims to solve]

By the way, in this type of measurement tube for an electromagnetic flowmeter, the electrodes are arranged so that the positioning work when assembling the reinforcing member 4 buried in the lining 2 into the pipe member 1 can be performed as easily as possible as described above. The through hole 4b positioned opposite the through hole 3 for the attachment portion was formed relatively large.

However, in this case where the through hole 4b of the reinforcing member 4 is formed to have a large diameter so as to face the through hole 3 for the electrode attachment part, the hole wall of the electrode attachment hole 6 of the electrode attachment member 5 is When installing the electrode 7 on the lining 2 that covers the lining 6b against the inside of the tube with a pressure sufficient to maintain the sealing property of the fluid to be measured, the following problems occur. That is, when the electrode 7 is inserted into the electrode attachment hole 6 from the outside of the tube, the lining 2 near the through hole 4b is pushed out to the inside of the tube as shown by the chain line in FIG. As a result, each time the lining 2 is cut or the electrode section is maintained, the shape of the lining 2 pushed into the pipe changes, which may change the output signal of the instrument. It was inevitable that the problem would arise.

[Means to solve the problem]

In order to solve these problems, the electromagnetic flowmeter according to the present invention has a through hole for attaching an electrode that is drilled in the central part in the axial direction from a direction perpendicular to the axis, and the inner wall is covered with a lining. A tube member having a reinforcing member embedded therein and having a large number of through holes in the lining, and an electrode mounting hole that is fitted into and fixed to the through hole of the tube member and whose hole wall is covered with the lining in the center of the tube member. and a hole punching member comprising a punching plate or a punching pipe that is fixed to a part of the electrode mounting member so as to form an annular space and locks the lining in the through hole in the electrode insertion direction. The structure includes a stop member.

[Effect]

According to the present invention, there is provided an electrode mounting member that is fitted into a through hole of a tube member and has an electrode mounting hole in the center of which the hole wall is covered with a lining, and an annular space is formed in a part of the electrode mounting member. The configuration includes a punching plate or a punching pipe that is fixed in place and locks the lining in the through-hole in the electrode insertion direction, so that the lining in the vicinity of the electrode mounting hole can be fixed. Even if an external force is applied in the electrode insertion direction, the lining at that portion will not deform to the extent that it will affect the flow of the fluid to be measured.

〔Example〕

FIG. 1 is a cross-sectional view of the main part showing the measuring tube for an electromagnetic flowmeter according to the present invention, and in the same figure, the third
Parts that are the same as or correspond to those in the figures are given the same numbers and their explanations will be omitted.

Now, according to the present invention, a hole is formed to lock the lining 2 in the electrode insertion direction at the hole wall 6b portion of the electrode attachment hole 6 of the electrode attachment member 5 that is inserted and fixed into the through hole 3 of the tube member 1. As a locking member, a step portion 36 is provided on the tube inner end surface 5a of the electrode attachment member 5, and an annular space 37 is provided between the step portion 36 and the step portion 36.
It is characterized in that the punching plate 38 is fixed so that a is formed.

Here, the outer peripheral edge of the punching plate 38 is attached to the tube inner side of the electrode mounting member 5 or the inner peripheral edge of the through hole 3 of the tube member 1.
It is preferable to fix it by welding or the like.

In the measuring tube for an electromagnetic flowmeter constructed in this way, an electrode mounting member is fitted and fixed in the through hole 3 of the tube member 1 and has an electrode mounting hole 6 in the center of which the hole wall 6b is covered with the lining 2. 5 and a punching plate 38 which is provided in the electrode mounting member 5 and serves as a hole punching and locking member that locks the lining 2 in the through hole 3 in the electrode insertion direction. Even if an external force is applied to the lining 2 in the vicinity in the direction of electrode insertion, the lining 2 in that area will not be pushed out and deformed to the extent that it will affect the flow of the fluid to be measured.

Therefore, even if the diameter of the through hole 4b corresponding to the electrode attachment part of the reinforcing member 4 is set larger than before, the lining 2 will not be pushed out into the pipe, and as a result, the pipe member 1 of the reinforcing member 4 will not be pushed out. This has the advantage that positioning against the base plate is simple and the installation work can be easily performed.

In the measurement tube for an electromagnetic flowmeter of this embodiment, the tube member 1, the electrode mounting member 5, and the punching plate 38 as a hole punching member for preventing extrusion deformation of the lining 2 are separate parts. Since the electrode mounting member 5 is configured by
It is also possible to perform processing such as direct welding on the punching plate 38 and the punching plate 38 relatively easily.

In addition, in the above-mentioned embodiment, a case was illustrated in which the punching plate 38 was used as the hole punching and locking member, but the present invention is not limited to this. For example, as shown in FIG. A step 44 is provided by forming a groove on the outside of the inner wall 6b of the electrode mounting hole 6, and the punching pipe 46 is inserted into the hole so that an annular space 45 is formed between the step 44 and the step 44. It will be easily understood that it may be fixed as a piercing and locking member.

In short, the hole-punching locking member is provided so as to form an annular space in a part of the electrode attachment member 5, and the lining 2 is also formed in this annular space via the hole-punching locking member. Therefore, it is only necessary to configure the lining 2 at the electrode mounting portion so as to prevent deformation of the lining 2 in the electrode insertion direction.

[Effect of idea]

As explained above, according to the present invention, an electrode is fitted and fixed in a through-hole for electrode attachment, which is bored in a direction perpendicular to the central part of the tube member in the axial direction, and the hole wall is covered with a lining in the central part. An electrode mounting member having a mounting hole, and a punching plate or punching pipe that is fixed to a part of the electrode mounting member so as to form an annular space and that locks the lining in the through hole portion in the electrode insertion direction. Since the structure is equipped with a hole-punching locking member made of It will not be deformed. Therefore, it is possible to eliminate the problems that occur in the past when the lining is cut or the output signal of the meter changes every time the electrode section is maintained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part showing one embodiment of the measuring tube for an electromagnetic flowmeter according to the present invention, Fig. 2 is a sectional view of the main part showing another embodiment of the invention, and Fig. 3 is a sectional view of the main part showing an embodiment of the measuring tube for an electromagnetic flowmeter according to the present invention. FIG. 2 is a cross-sectional view of a main part of a flowmeter measurement tube. 1... Pipe member, 1a... Inner wall, 2... Lining, 3... Through hole, 4... Reinforcing member, 4a... Through hole, 4b... Through hole for electrode attachment part, 5... Electrode attachment member, 5a... tube inner end surface, 6... hole for electrode attachment, 6b... hole wall, 7... electrode, 36... step, 37... annular space, 38... hole punching and locking member punching plate, 44...stepped portion, 4
5... Annular space, 46... Punching pipe as a hole punching and locking member.

Claims (1)

[Scope of utility model registration request] A tube member having a through hole for an electrode attachment part drilled in a direction perpendicular to the axis in the central part in the axial direction and having an inner wall covered with a lining, and a tube member having a large number of through holes. a reinforcing member disposed on an inner wall of the pipe at predetermined intervals and embedded in the lining and having a through hole larger in diameter than the through hole at a position corresponding to the through hole; An electrode mounting member having an electrode mounting hole that is inserted and fixed into a through hole of the member and whose hole wall is covered with the lining in the center, and a part of this electrode mounting member between the electrode mounting member and the electrode mounting member. 1. A measuring tube for an electromagnetic flowmeter, comprising: a perforated locking member fixed to the through hole so as to form an annular space therein, and locking the lining in the through hole in the electrode insertion direction.