JPH0625682B2 - Assembling method of electromagnetic flowmeter - Google Patents

Description

The present invention relates to an assembling method of an electromagnetic flowmeter having a function of preventing water from entering or dew condensation.

[Prior Art] Generally, an electromagnetic flow meter is known as a device that uses the Faraday electromagnetic induction phenomenon to convert the flow rate of a conductive fluid flowing in a measuring tube into an electric signal for measurement, and has been known from the prior art. It is configured as shown in FIG. This will be described with reference to the same figure. In the figure, reference numeral 1 is a case for an electromagnetic flowmeter, which is entirely formed by a cylindrical body, and has a cylindrical shape whose outer peripheral surface opens inside and outside the case. Mounting part 2
Are provided integrally. Reference numeral 3 is a measuring tube having a pair of electrodes (not shown) facing each other in the central portion in the axial direction, which is mounted on the inner peripheral surface of the case 1 and has a terminal board for connecting lead wires on the outer peripheral surface. 4 is attached. 5
Is a pair of exciting coils (only one is shown) that forms a magnetic field in a direction perpendicular to the flow direction of the fluid to be measured, which is provided on the outer peripheral surface of the measuring tube 3 and is connected to the terminal board 4. Reference numeral 6 is, for example, an epoxy-based or urethane-based resin that surrounds the electromagnetic flowmeter component, and includes the case 1 and the measurement tube 3
Is filled in between the case and the case, and is configured to prevent water from entering the case and dew condensation in the case. 7
Is a lead wire for connecting the terminal board 4 to the terminal box or converter.

By the way, in assembling the electromagnetic flowmeter configured as described above, the measuring tube 3 having the electrode (not shown), the exciting coil 5 (only one of which is shown) and the terminal block 4 mounted in advance is inserted and fixed in the case 1. Next, the case 1 and the measuring pipe 3 are arranged so as to surround the electromagnetic flowmeter parts between the measuring pipe 3 and the case 1.
It is performed by filling the resin 6 between and.

[Problems to be Solved by the Invention]

However, in the method of assembling this type of electromagnetic flow meter,
Since the lead wires (electrode lead wire, coil lead wire, and ground wire) 7 are taken out from inside the case 1 through the mounting portion 2 when the measuring tube 3 is inserted and fixed in the case 1, the lead wire take-out work is performed. However, there is a problem in that the work is done in a small space, which makes it difficult to assemble the electromagnetic flowmeter.

Therefore, in the conventional method of assembling the electromagnetic flow meter, the third method is used.
As shown in the figure, a receptacle 12 as a first connector connected to the electrode 11 and the exciting coil 5, and a plug 13 as a second connector attached to the receptacle 12.
The one using is also adopted.

That is, in assembling this type of electromagnetic flowmeter, the measuring tube 3 having the receptacle 11 connected to the electrode 11 and the exciting coil 5 mounted on the outer peripheral surface thereof is used as the cylindrical case 1 for the electromagnetic flowmeter.
Insert the tube into the measuring tube 3 and fix it in the radial direction of the measuring tube 3.
Is mounted on the receptacle 12, and then the resin 6 is filled between the cylindrical case 1 and the measuring tube 3 so as to surround the receptacle 12, the plug 13, and the like.

However, in this type of electromagnetic flow diameter assembly method,
Since a clearance is formed between the receptacle 12 and the plug 13, the resin 6 has passed through the clearance and flowed into the contact point between the receptacle 12 and the plug 13. As a result, considering the electrolytic corrosion effect generated by the leakage current, the difference in the linear expansion coefficient between the resin 6 and the receptacle 12, the plug 13 and the contraction / expansion of the resin 6 during curing,
As a result, it is necessary to use an expensive material as the material, and the manufacturing cost increases. In this case, it is conceivable that oil is applied to the contact points of the receptacle 12 and the plug 13 to prevent the resin 6 from flowing into the contact points, but it is not possible to reliably prevent the resin 6 from flowing into the contact points. It was

The present invention has been made in view of such circumstances, and it is not necessary to take out lead wires and select a resin material through a case, thereby simplifying the assembly work and reducing the cost. The present invention provides a method of assembling an electromagnetic flowmeter that can be used.

[Means for Solving the Problems] In an electromagnetic flowmeter assembling method according to the present invention, a measuring tube having a first connector connected to an electrode and an exciting coil on its outer peripheral surface is provided in a cylindrical case for an electromagnetic flowmeter. Then, the second connector is attached to the first connector from the radial direction of the measuring pipe, and then the tubular case and the measuring pipe are arranged so as to surround the second connector and the first connector. A method for assembling an electromagnetic flow meter, in which a resin is filled between the two connectors, in which an elastic sheet is interposed between both connectors before the resin is filled.

[Work]

In the present invention, the elastic sheet closes the clearance formed between the first connector and the second connector, so that it is possible to reliably prevent the resin from flowing into the connector contact portion.

〔Example〕

Hereinafter, the configuration and the like of the present invention will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 is a cross-sectional view showing an electromagnetic flowmeter by the assembly method according to the present invention. In FIG. 1, the same members as those in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, reference numeral 21 denotes a receptacle as a first connector, which is fixed to a portion on the outer peripheral surface of the measuring tube 3 corresponding to the mounting portion 2. This receptacle
A lead wire (not shown) of the electrode (not shown) and a coil lead wire (not shown) of the exciting coil 5 are connected to the terminal 22 of 21. Reference numeral 23 denotes a plug as a second connector, which has a terminal 24 connected to the terminal 22 and is mounted on the receptacle 21. Reference numeral 25 denotes an elastic sheet made of, for example, silicon rubber, which is interposed between the receptacle 21 and the plug 23, and both connectors 2
The clearance between 1 and 23 is blocked. Reference numeral 26 is a screw rod for strengthening the connection between the receptacle 21 and the plug 23.

Next, a method of assembling the electromagnetic flow meter according to the present invention will be described.

First, the measuring tube 3 to which the components for the electromagnetic flowmeter such as the electrode (not shown), the exciting coil 5 and the receptacle 21 are attached in advance on the outer peripheral surface is inserted and fixed in the case 1. Then
The plug 23 is inserted together with the threaded rod 26 from the radial direction of the measuring pipe 3, and the plug 23 is attached to the receptacle 21.
At this time, an elastic sheet is placed between the receptacle 21 and the plug 23.
Intervene 25. Then, receptacle 21, plug 23
A resin 6 is filled between the case 1 and the measuring tube 3 so as to surround the electromagnetic flowmeter parts such as.

In this way, the electromagnetic flow meter can be assembled.

Therefore, in the present invention, the clearance formed between the receptacle 21 and the plug 23 is closed by the elastic sheet 25, so that the resin 6 can be surely prevented from flowing into the connector contact portion. It is not necessary to take out the lead wire 7 from the inside of the case 1 through the mounting portion 2 or select the material of the resin 6.

Needless to say, the material of the elastic sheet 25 in the present invention is not limited to the above-mentioned embodiment.

〔The invention's effect〕

As described above, according to the present invention, the measuring tube having the first connector connected to the electrode and the exciting coil on the outer peripheral surface thereof is inserted and fixed in the cylindrical case for the electromagnetic flow meter, and then the measuring tube is fixed. After the second connector is attached to the first connector from the radial direction of the electromagnetic field, resin is filled between the cylindrical case and the measuring tube so as to surround the second connector and the first connector. In the method of assembling the flowmeter, since the elastic sheet is interposed between both connectors before the resin is filled, the elastic sheet closes the clearance formed between the first connector and the second connector. Therefore, it is possible to reliably prevent the resin from flowing into the contact portions of both connectors. Therefore, it is unnecessary to take out the lead wire and select the resin material after passing through the inside of the cylindrical case, so that the electromagnetic flow meter assembling work can be simplified and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an electromagnetic flowmeter by an assembling method according to the present invention, and FIGS. 2 and 3 are sectional views showing an electromagnetic flowmeter by a conventional assembling method. 1 ... Case, 2 ... Mounting part, 3 ... Measuring tube, 5 ... Excitation coil, 6 ... Resin, 21 ... Receptacle, 22 ... Terminal, 23 ... Plug, 24 ... Terminal, 25 ... … Elastic sheet.

Claims (1)

[Claims] 1. A measuring tube having a first connector connected to an electrode and an exciting coil on its outer peripheral surface is inserted and fixed in a cylindrical case for an electromagnetic flow meter, and then a second tube is arranged in a radial direction of the measuring tube. After mounting the above connector to the first connector, an electromagnetic flowmeter is formed by filling a resin between the cylindrical case and the measuring pipe so as to surround the second connector and the first connector. The method for assembling an electromagnetic flowmeter according to claim 1, wherein an elastic sheet is interposed between the connectors before the resin is filled.