JP2011064493A - Electromagnetic flow meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve an electromagnetic flow meter capable of inexpensively and easily applying lining while holding an anchor effect to the lining and capable of applying lining without peeling even for a measurement tube of a small diameter. <P>SOLUTION: In the electromagnetic flow meter including a liner applied to an inner circumferential surface of the measurement tube, the electromagnetic flow meter includes: a heat-resistant fiber cloth sheet attached onto the inner circumferential surface of the measurement tube; and the liner provided to cover the heat-resistant fiber cloth sheet and the inner circumferential surface of the measurement tube. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an electromagnetic flow meter.
More specifically, the present invention relates to a lining locking structure of an electromagnetic flow meter.

FIG. 4 is a diagram illustrating a configuration of a conventional example that is generally used, and the upper half of the figure is shown in a sectional view.
FIG. 5 is a detailed explanatory view of the components of FIG. 4, and FIG. 6 is a side view of FIG.

FIG. 4 shows the measuring tube 1 that has been lined.
In the electromagnetic flow meter, the lining inner diameter may be deformed depending on the use conditions (fluid temperature, pressure, etc.), which may adversely affect the measurement accuracy.
Therefore, in order to prevent the deformation of the lining body 2, a locking plate 3 for locking it is provided inside the lining body 2. Details of the locking plate 3 are shown in FIG.

  In FIG. 5, a plurality of holes 4 are provided in the cylindrical locking plate 3. Since the lining body 2 is also applied in the hole 4, the lining body 2 is fixed by the hole 4, and the above-described deformation can be prevented.

JP 2002-048612 A Japanese Patent Laid-Open No. 2002-054960

Such an apparatus has the following problems.
For a lining material having no adhesion to metal, a locking plate having a cylindrical metal plate with a hole inside the measuring tube is inserted, welded to the measuring tube, and then lining is performed.
Although the lining and the measuring tube are not adhesive, the lining does not peel from the measuring tube because of the anchor effect between the measuring tube, the welded locking plate, and the lining.

However, because the inner diameter of the measuring tube has a dimensional tolerance, it is very difficult to align with the metal locking plate. The locking plate corresponds to the upper limit of the dimensional tolerance of the measuring tube, and the dimensional tolerance lower limit. It was necessary to prepare the thing of several dimensions, such as a thing corresponding to.
In addition, since the locking plate is formed in a cylindrical shape by making a hole in a metal plate, there is a demerit that a manufacturing cost is required.

  In addition, for a measuring tube having a small diameter, it is difficult to weld a metal locking plate to the measuring tube. Further, for example, in a method of bonding an integrated sheet of glass cloth and PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) (hereinafter referred to as “PFA”) into a measuring tube, the material (metal or PFA) Since the bendability was not good, it could not be applied to small apertures.

  An object of the present invention is to solve the above-mentioned problems, and to provide an electromagnetic flowmeter that can perform lining without peeling even with a small-diameter measuring tube, while maintaining the anchor effect on the lining, at low cost and easily. There is.

In order to achieve such a problem, in the present invention, in the electromagnetic flow meter of claim 1,
In an electromagnetic flowmeter comprising a lining body lined on the inner diameter surface of a measurement tube, a heat resistant fiber cloth sheet attached to the inner diameter surface of the measurement tube, and the heat resistance fiber cloth sheet and the inner diameter surface of the measurement tube And a lining body provided so as to cover the surface.

In the electromagnetic flow meter according to claim 2 of the present invention, in the electromagnetic flow meter according to claim 1,
A glass fiber cloth sheet is used as the heat resistant fiber cloth sheet.

According to claim 1 of the present invention, there are the following effects.
Even when the tolerance width of the inner diameter tolerance of the measuring tube is large, the heat-resistant fiber cloth sheet to be attached to the inside can be adjusted by simply cutting its length and locking multiple dimensions like a locking plate There is no need to prepare and place a plate, and an electromagnetic flow meter that can simplify the management of manufactured parts can be obtained.

Also, since the bendability is good, it is easy to make a small cylindrical shape, and it is possible to obtain an electromagnetic flowmeter that can be relatively easily bonded to the inside of a measuring tube with a small diameter and can expand the range of diameters that can be lined.
An electromagnetic flowmeter that can be easily lined is obtained while retaining the anchor effect function of a conventional locking plate that suppresses the separation between the measuring tube and the lining body.

As an advantage of the material, the heat-resistant fiber cloth sheet is generally easily available because it is a highly commercially available material, is relatively inexpensive, has excellent heat resistance, and has good adhesion to metal. It is a material.
The thickness and weaving method of the glass cloth can be freely selected in consideration of the locking force of the lining.
As the weaving method, plain weave and twill weave are generally used.

  As an advantage of bonding, an adhesive having a sufficient bonding performance even for high temperatures is commercially available. Adhesion is a simple task, and does not require special equipment or special skills such as welding equipment or welding skills, which are necessary for metal locking plates.

  As an additional effect, the lining resin such as PFA vaporizes and permeates the fluid and accumulates as a liquid at the interface with the measuring tube. For this reason, various measures have been taken to provide a drain hole (hole) in the measuring tube to escape the accumulated liquid. In the present invention, the fluid that permeates and accumulates on the tube wall reaches the drain hole via a fine passage in the heat resistant fiber cloth sheet, and can easily escape to the outside of the tube.

According to claim 2 of the present invention, there are the following effects.
Since the glass fiber cloth sheet is used for the heat-resistant fiber cloth sheet, the glass fiber cloth sheet is widely used for homes and the like, and since it is a highly commercially available material, it is easily available and inexpensive. Because it is a material with excellent heat resistance and good adhesion to metal,
An inexpensive electromagnetic flowmeter with improved heat resistance and workability can be obtained.

It is principal part structure explanatory drawing of one Example of this invention. It is principal part structure explanatory drawing of FIG. It is principal part perspective explanatory drawing of FIG. It is principal part structure explanatory drawing of the prior art example generally used conventionally. FIG. 5 is a detailed explanatory diagram of components in FIG. 4. FIG. 5 is a side view of FIG. 4.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory view of the main part configuration of one embodiment of the present invention, FIG. 2 is an explanatory view of the main part structure of FIG. 1, and FIG. 3 is an explanatory perspective view of the main part of FIG.
In the figure, the same symbol structure as in FIG. 4 represents the same function.
Only differences from FIG. 4 will be described below.

In FIG. 1, the heat resistant fiber cloth sheet 11 is attached to the inner diameter surface of the measuring tube 1. In this case, it is bonded A.
In this case, a glass fiber cloth sheet is used as the heat resistant fiber cloth sheet.
The lining body 12 is provided so as to cover the heat resistant fiber cloth sheet 11 and the inner diameter surface of the measuring tube 1.

In the above configuration,
(1) A glass cloth sheet is bonded to the inside of the measuring tube.
There are several methods of bonding. For example, an adhesive material is applied to the entire inner surface of the measuring tube 1, and a glass cloth sheet 11 cut so as to be applied is pasted along the measuring tube 1. There is no problem in performance even if the start and end seams overlap slightly.
Since the glass cloth sheet 11 can be cut easily with commercially available scissors or the like, it is easy to adapt to the measuring tube 1 having different inner diameters.

2) Put lining into the lining molding machine.
Since the glass cloth sheet 11 is made of fiber, the lining resin 12 enters the gap, so that the same anchor effect as that of the locking plate 3 can be expected when the resin is cured.

As a result,
Even when the tolerance width of the inner diameter dimensional tolerance of the measuring tube is large, the glass cloth sheet 11 to be affixed to the inside can be easily adjusted by cutting its length. There is no need to prepare and place the plate 3, and an electromagnetic flow meter that can simplify the management of manufactured parts can be obtained.

Also, since the bendability is good, it is easy to make a small cylindrical shape, and it is possible to obtain an electromagnetic flowmeter that can be relatively easily bonded to the inside of a measuring tube with a small diameter and can expand the range of diameters that can be lined.
An electromagnetic flow meter that can be easily lining 12 while having an anchor effect function by the conventional locking plate 3 that suppresses separation between the measuring tube 1 and the lining body 12 is obtained.

As an advantage of the material, the glass cloth sheet 11 is generally a material that is highly commercially available, so that it is easily available, is relatively inexpensive, has excellent heat resistance, and has good adhesion to metal. It is.
The thickness and weaving method of the glass cloth can be freely selected in consideration of the locking force of the lining.
As the weaving method, plain weave and twill weave are generally used.

  As an advantage of bonding, an adhesive having a sufficient bonding performance even for high temperatures is commercially available. Since the bonding is a simple operation, no special device or special skill such as a welding device or welding skill, which is necessary for the metal locking plate 3, is required.

  As an additional effect, the lining resin 12 such as PFA vaporizes and permeates the fluid and accumulates as a liquid at the interface with the measuring tube 1. For this reason, various measures have been taken to provide a drain hole (hole) in the measuring tube 1 to escape the accumulated liquid. In the present invention, the fluid that permeates and accumulates on the tube wall reaches the drain hole via the fine passage in the glass cloth sheet 11 and can easily escape to the outside of the tube.

  In addition, since the glass fiber cloth sheet 11 is used as the heat resistant fiber cloth sheet, the glass fiber cloth sheet 11 is widely used for homes and the like, and is easily available because it is a highly commercially available material. Since it is a material that is inexpensive, extremely excellent in heat resistance, and has good adhesion to metal, an electromagnetic flow meter that is inexpensive and has improved heat resistance and workability can be obtained.

  In the above-described embodiment, it is described that the glass cloth sheet is attached to the glass cloth sheet, but the present invention is not limited to this. good.

Instead of the glass cloth sheet, a commercially available glass cloth band can be used.
A glass cloth can be attached to the entire inner surface of the measuring tube 1 by winding a band on the inner side of the measuring tube in a spiral manner and bonding them.

In addition, a material sheet such as ceramic fiber, silica fiber, or alumina fiber may be used instead of the glass fiber cloth sheet material. In short, any heat-resistant fiber cloth sheet may be used.
These are all materials that are commercially available at low cost.

  In the present invention, the lining method (such as PFA) can be a general transfer molding, injection molding, or rotational molding.

The above description merely shows a specific preferred embodiment for the purpose of explanation and illustration of the present invention.
Therefore, the present invention is not limited to the above-described embodiments, and includes many changes and modifications without departing from the essence thereof.

DESCRIPTION OF SYMBOLS 1 Measuring tube 2 Lining body 3 Locking plate 4 Hole 11 Glass fiber cloth sheet 12 Lining body A Bonding

Claims (2)

In an electromagnetic flow meter comprising a lining body lined on the inner diameter surface of a measurement tube,
A heat-resistant fiber cloth sheet attached to the inner diameter surface of the measuring tube;
An electromagnetic flowmeter comprising: the heat-resistant fiber cloth sheet; and a lining body provided to cover an inner diameter surface of the measuring tube. The electromagnetic flowmeter according to claim 1, wherein a glass fiber cloth sheet is used as the heat resistant fiber cloth sheet.

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