JP5200969B2 - Electromagnetic flow meter - Google Patents

Description

  The present invention relates to an electromagnetic flow meter.

FIG. 3 is a diagram illustrating the configuration of the main part of a conventional example that is generally used, and FIG. 4 is a diagram illustrating the configuration of the main part of FIG.
In the figure, a round hole 3 having a taper 2 formed in a part of a measurement tube 1 made of a member such as stainless steel, and affixed to the inner surface of the measurement tube 1 so as to avoid the central portion of the round hole 3. An insulating member 4 made of Teflon (registered trademark) or rubber, a cylindrical insulating member 5 with a hook to be inserted into the round hole 3 from the outside of the measuring tube 1, and a rod-like shape having a taper 6 formed in part. The member 7 is used.

Then, an electrode 8 that is inserted into the round hole 3 from the inside of the measuring tube 1 and a part of which protrudes to the outside of the measuring tube 1, and a coil spring 9 that is inserted outside the protruding portion of the electrode 8. And a washer 11 inserted outside the protruding portion of the electrode 8 and a force obtained by the coil spring 9 screwed into the protruding portion of the electrode 8 to bias the electrode 8 to the outside of the measuring tube 1, thereby tapering the electrode 8. It is comprised by the nut 12 which adheres 6 parts to the insulating member 4. FIG.
In this case, the insulating member 4 is made of hard natural rubber.

In the above configuration, the process of forming the hard natural rubber electrode portion is as follows.
(1) A material of hard natural rubber is attached to the measuring tube 1 and then transferred to a vulcanization process to complete an insulating member 4 made of hard natural rubber lining by vulcanization.
(2) Open the round hole 3 which is a pilot hole for the electrode part, and process the counterbore of the taper 2 with a dedicated blade.
(3) Then, an electrode set part is assembled.
(4) Move to the aging step and heat and keep warm for 24 hours.

Japanese Patent Application Laid-Open No. 07-012605

Such an apparatus has the following problems.
The finish of the counterbore surface, which is related to the sealing performance of the electrode, is important, but if the work surface is scratched due to work mistakes or blade defects, the entire lining becomes defective.
The electrode structure is complicated and the number of parts is large. And since there are many factors which affect the sealing performance of an electrode, the reliability of sealing falls.

Since the surface of the lining 4 that comes into contact with the electrode undergoes creep deformation, an aging treatment is required after the electrode is attached.
Since the material cost and the number of work steps are large, the total cost of the electrode part of the flow meter increases.

  Further, the taper 2 formed in the measuring tube 1 is elliptical as shown in FIG. 4, and on the other hand, since the taper 6 of each electrode 8 is circular, a recess 13 is formed in the measuring tube 1. When the measurement fluid is a fluid for food, a part of the fluid flowing in the measurement tube 1 stays in the recess 13 and there is a disadvantage that a sanitary problem occurs.

  Therefore, in order to eliminate such inconvenience, the shape of the electrode 8 is processed into an elliptical shape, or each electrode 8 is inserted into the round hole 3, and then the portion of the electrode 8 protruding into the measuring tube 1 is replaced with a measuring tube. Although a method of cutting so as to be flush with the inner peripheral surface of 1 is also conceivable, there is a problem in that doing so increases the processing cost and becomes very expensive.

  An object of the present invention is to solve the above-described problems, and to provide an electromagnetic flowmeter having an electrode structure that is simple in structure, high in reliability, and low in cost.

In order to achieve such a problem, in the present invention, in the electromagnetic flow meter of claim 1,
In an electromagnetic flowmeter in which a vulcanization process is applied after an electrode is attached to a liningd measuring tube through an electrode attachment hole, one end side of the electrode is inserted into the electrode attachment hole, and the other end of the electrode rod A conical adhesive application body attached to the top side, an electrode body attached to the bottom surface of the adhesive application body, and an adhesive that is applied to the adhesive application body and integrated with the lining during the vulcanization process of the lining The electrode rod is screwed onto the measuring tube so that the adhesive applied body sinks into the lining and the electrode body protrudes from the surface of the lining. And a nut.

According to claim 1 of the present invention, there are the following effects.
Since the number of parts can be minimized, an electromagnetic flowmeter can be obtained in which the sealing performance and reliability are improved and the total cost of the electrode portion can be reduced.
Specifically, counterbore processing is not required by avoiding the O-ring structure. In addition, an electromagnetic flow meter can be obtained that can reduce factors affecting the sealing performance due to the quality of the counterbore surface and the quality of the O-ring.
Since no spring parts are required, it is possible to eliminate the continuous plastic deformation of the lining of the electrode portion, and an electromagnetic flow meter that does not require an aging process is obtained.
After assembling the electrode, an electromagnetic flow meter that can form a seal can be obtained by vulcanizing and integrating hard natural rubber.

It is principal part structure explanatory drawing of one Example of this invention. It is principal part structure explanatory drawing of FIG. It is structure explanatory drawing of the prior art example generally used conventionally. It is principal part structure explanatory drawing of FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating the configuration of the main part of one embodiment of the present invention, and FIG.
In the figure, configurations with the same symbols as in FIG. 3 represent the same functions.
Only the difference from FIG. 3 will be described below.

In FIG. 1, one end side of the electrode rod 21 is inserted into the electrode mounting hole 22.
The adhesive application body 23 has a conical shape with the top side attached to the other end of the electrode rod 21.
The electrode body 24 is attached to the bottom surface of the adhesive application body 23 and has a semispherical shape.
The adhesive 25 is applied to the adhesive application body 23 having a slope, and is integrated with the lining 4 during the vulcanization process of the lining 4.

  The nut 26 is attached to one end of the electrode rod 21 via an insulating washer 27, and the adhesive application body 23 sinks into the lining 4 so that the electrode body 24 protrudes from the surface of the lining 4. Is screwed to the measuring tube 1.

In the above configuration, the cloth of the lining 4 made of hard natural rubber is pasted on the measuring tube 1, and the electrode mounting hole 22 through which the electrode passes is opened.
The adhesive 25 is evenly applied to the slope of the adhesive application body 23.

The electrode rod 21 is screwed to the measuring tube 1 so that the adhesive application body 23 sinks into the lining 4 by the nut 26 through the electrode mounting hole 22 and the electrode body 24 protrudes from the surface of the lining 4.
The process proceeds to the vulcanization step, and vulcanization is performed to obtain an electrode in which the adhesive application body 23 is integrated with the lining 4 by the adhesive 25.

As a result, since the number of parts can be minimized, an electromagnetic flowmeter can be obtained in which the sealing performance and reliability are improved and the total cost of the electrode portion can be reduced.
Specifically, counterbore processing is not required by avoiding the O-ring structure. In addition, an electromagnetic flow meter can be obtained that can reduce factors affecting the sealing performance due to the quality of the counterbore surface and the quality of the O-ring.
Since no spring parts are required, it is possible to eliminate the continuous plastic deformation of the lining 4 of the electrode portion, and an electromagnetic flow meter that does not require an aging process is obtained.

  Needless to say, the present invention can be applied not only to hard natural rubber-lined electromagnetic flow meters but also to EPDM linings and soft natural rubber-lined electromagnetic flow meters.

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 Taper 3 Round hole 4 Insulating member 5 Cylindrical insulating member 6 Taper 7 Bar-shaped member 8 Electrode 9 Coil spring 11 Washer 12 Nut 13 Recessed part 21 Electrode rod 22 Electrode attachment hole 23 Adhesive application body 24 Electrode main body 25 Adhesive 26 Nut 27 Insulating washer

Claims (1)

In an electromagnetic flow meter in which a vulcanization process is added after an electrode is attached to a lining-equipped measurement tube through an electrode attachment hole,
An electrode rod having one end side inserted into the electrode mounting hole;
The top side is attached to the other end of this electrode rod, and a conical adhesive application body,
An electrode body attached to the bottom surface of the adhesive application body;
An adhesive applied to the adhesive application body and integrated with the lining during the vulcanization step of the lining;
A nut attached to one end of the electrode rod via an insulating washer and screwing the electrode rod onto the measuring tube so that the adhesive application body sinks into the lining and the electrode body protrudes from the surface of the lining; An electromagnetic flow meter comprising:

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