JPH041460Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electromagnetic flowmeter that electrically measures the flow rate of fluid flowing inside a measuring tube, and particularly relates to an electromagnetic flowmeter that electrically measures the flow rate of fluid flowing inside a measuring tube. This invention relates to an improvement in an electromagnetic flowmeter that is fitted and fixed into an armored pipe from the axial direction, a connector plug for shorting between the inside and outside is inserted through the armored pipe from the outside, and this plug and the connector are connected. .

[Prior Art] Conventionally, in electromagnetic flowmeters, the material of the lining material covering the inner wall of the measuring tube has been changed depending on the fluid to be measured. However, it is very troublesome to change the lining material each time the fluid to be measured is changed, and it is also necessary to request the manufacturer, which takes time and impedes measurement.

Therefore, recently, the measurement tube has been made into a double-pipe structure, and a large number of inner tubes lined with lining materials according to the fluid to be measured are prepared, and these inner tubes can be replaced as necessary. An electromagnetic flowmeter has been proposed that allows the user to quickly respond to changes in the fluid to be measured.
In this case, an excitation coil is attached to the inner tube, and electrodes are attached to the outer tube and the inner tube so as to pass through the inner tube, and these are connected to the converter (or the terminal of the terminal box) by a lead wire. There is a method of connecting the lead wire directly between the converter and the electromagnetic coil and electrode, but in such a method, the lead wire is passed between the inner tube and the outer tube, and then installed on the outer circumferential surface of the outer tube. Since the transducer must be inserted through the center hole of the converter mounting part, the work is cumbersome and requires skill. Otherwise, the lead wire may be damaged or disconnected.

Therefore, in order to solve this problem, the present applicant has developed an electromagnetic flowmeter in which a connector is provided on the outer periphery of the inner pipe, and an inner/outside shorting connector inserted through the outer pipe is connected to the connector of the inner pipe. (Special Application No. 1982-192260) was proposed.

[Problem that the invention attempts to solve]

Although these electromagnetic flowmeters have the advantage of eliminating lead wires on the internal pipe side, preventing disconnection accidents and making assembly and replacement work easy, they do have problems with connecting connectors to each other. It was hot.

In other words, the connector disposed on the outer circumference of the inner pipe does not have any guide portion for guiding the inner and outer shorting connectors, and therefore it takes time to align the centers of the connectors, making it difficult to connect them easily. . Furthermore, if a guide portion is simply provided, a portion of the guide portion comes into contact with the inner circumferential wall of the outer tube, increasing the height of the receptacle and increasing the installation space.

[Means for solving problems]

The electromagnetic flowmeter according to the present invention has been developed in view of the above-mentioned points, and has an excitation coil and a connector receptacle disposed in a recess provided in the outer body of the inner tube, and a tip on the surface of the receptacle. A protruding part whose surface curves according to the inner diameter shape of the outer pipe is integrally provided, a connector plug guiding taper is formed inside this protruding part, and the connector plug is inserted into the protruding part along this taper. It is designed to connect both male and female contacts.

[Effect]

In the present invention, the protrusion is provided on the connector receptacle, and the taper for guiding the connector plug is formed inside the protrusion, so that the connector plug can be smoothly inserted into the protrusion.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Fig. 1 is a side sectional view showing an embodiment of the electromagnetic flowmeter according to the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1,
3 to 5 are a partially cutaway front view, a plan view, and a sectional view taken along the line of FIG. 4 of the connector receptacle. In these figures, 1 is the outer tube,
An inner tube 3, which will be described later, is fitted and fixed in the center hole 2 from the axial direction, and a cylindrical mounting part 5 on which a converter 4 (or terminal box) is placed and fixed is integrally formed upward on the outer peripheral surface. It is installed protrudingly.

The inner pipe 3 has the outer pipe 1 at its both end openings.
A pair of collars 6a having an outer diameter that is almost the same as the inner diameter of
6b is integrally provided by molding or welding,
As a result, a recess 7 is formed in the outer body 3A of the inner tube 3, and in this recess 7, a pair of left and right electrodes 8A, 8B (8B not shown) facing each other, a pair of upper and lower saddle-shaped excitation coils 9A, 9B, a connector receptacle 10, which will be described later, is provided. In addition, the inner circumferential surface of the inner pipe 3 and each of the flanges 6a, 6b
The surface is lined with an insulator 11.
The pair of electrodes 8A and 8B penetrate the inner tube 3 and the insulator 11, and their inner ends are exposed inside the inner tube 3. The inner tube 3 configured in this way is connected to the outer tube 1 through O-rings 13 and 14 fitted to the outer peripheral surfaces of the respective flanges 6a and 6b.
It is positioned and fixed by a bolt 15 that is inserted into the center hole 2 of the exterior tube 1 and screwed through the exterior tube 1 from below.

A ring-shaped mounting base 21 is fixed on the upper side of the outer peripheral body 3A at a location corresponding to the inner hole 20 of the mounting portion 5, and the connector receptacle 10 is mounted on this mounting base 21 with a pair of setscrews. 22a,
22b. As shown in FIGS. 3 to 5, the connector receptacle 10 includes a base portion 24 having an insertion hole 23 in the center, and four male contacts 25a disposed through the base portion 24. 25d, integral screw mounting portions 26a and 26b integrally provided so as to project from the left and right sides of the base portion 24, and the male contacts 25a to 25d integrally provided on the surface side of the base portion 24.
and a cylindrical protrusion 27 surrounding the 2
The male contacts, for example 25a and 25c, are connected to the pair of saddle-shaped excitation coils 9A, 9B, and the remaining two contacts 25b, 25d are connected to the pair of electrodes 8.
A and 8B are connected to each other via lead wires (not shown). In addition, the male contacts 25a~
25d are equally spaced on the same circumference. As shown in FIG. 2, the tip surface of the protrusion 27 is shaped like an arc with a radius slightly smaller than the inner diameter of the center hole 2 so as to face the center hole 2 at approximately the same distance over the entire circumference. It is formed. Therefore, the height of the protrusion 27 is the same and highest at the center of the front and rear ends (in the axial direction of the sheathing tube 1), and gradually decreases as it reaches the left and right ends. Connector plug guiding tapers 29 and 30 are formed at the upper end portions of the inner surfaces of the front and rear ends, respectively. These tapers 29 and 30 are connected to the protrusion 27.
They are each formed over approximately half the circumference of the area.

Reference numeral 33 denotes a connector plug inserted into the inner hole 20 of the mounting portion 5, and this connector plug 33 has an outer diameter that is approximately equal to or slightly smaller than the inner diameter of the protrusion portion 27, and each of the male Female type contacts 3 correspond to type contacts 25a to 25d.
4a to 34d are buried. Each of the female connectors 34a is provided on the insertion side end surface of the connector plug 33.
~34d and communicates with the inner hole of each of the male connectors 2.
Hole 36a into which upper protrusions 5a to 25d are inserted
36d (36a and 36c are not shown) are formed. One end of lead wires 37a to 37d is connected to the upper end protrusion of each of the female contacts 34a to 34d, and the other ends of these lead wires are connected to the electrical circuit of the converter 4 (or the terminal of the terminal box), respectively. It is connected.

Reference numeral 40 denotes a take-out pipe whose lower end is buried in the connector plug 33, and whose upper end is inserted into the converter 4 (or terminal box).
A threaded rod 41 is rotatably inserted into the interior thereof. A knob 42 is integrally provided at the upper end of the threaded rod 41, and the lower end thereof passes through a hole 43 provided at the center of the connector plug 33 and the insertion hole 23 of the connector receptacle 10, and extends from the outer periphery of the inner pipe 3. It is screwed into a screw hole 44 formed in the surface. This is done by inserting the lower end of the connector plug 33 into the protrusion 27 of the connector receptacle 10, and
This is effective in firmly positioning and fixing the connector plug 33 to the connector receptacle 10 when the female contacts 34a to 34d are connected to each other. One end of a ground wire 46 is connected to a ground terminal 45 and the other end of the ground wire 46 is connected to the threaded rod 41, thereby grounding the inner pipe 3.

Thus, according to such a configuration, when the connector plug 33 is inserted into the inner hole 20 of the mounting portion 5 and intended to be coupled to the connector receptacle 10, the connector plug 33 is inserted along the connector plug guide tapers 29, 30. Since the lower end portion is inserted into the protruding portion 27, the connector plug 33 and the connector receptacle 10 can be easily and reliably connected at once. In other words, each of the male contacts 25a to 25d and the female contacts 34a to 34d
can be easily connected. Also, threaded rod 4
1 into the screw hole 44, the lower end surface of the knob 42 presses down the upper end surface of the mounting tube 40, so the connector plug 33 descends together with the mounting tube 40, and as described above, the connector plug 33 descends together with the mounting tube 40. It is inserted into the protruding portion 27 while being guided by the guide tapers 29 and 30. Therefore, also in this case, the connector plug 33 and the connector receptacle 10
can be easily combined. Here, if the height of the protrusion portion 27 is set to be the same height all around the circumference, it is necessary to lower the receptacle itself to avoid the left and right ends from hitting the circumferential wall of the center hole 2. In this case, the receptacle becomes large and requires a large installation space, but in the present invention, the protrusion 27 is formed according to the inner diameter shape of the center hole 2, and the height of each part is changed, so that the receptacle itself can be There is no need to lower the receptacle and it can be installed at a predetermined position, and if it can be installed at a predetermined position, the installation space is small and the receptacle 10 can be miniaturized.

Although the above embodiment has been described with respect to the case where the plug guide tapers 29 and 30 are formed on the left and right inner surfaces of the protrusion portion 27, the present invention is not limited to this in any way, but can be applied to the entire circumference. Of course, it may be formed.

Further, in the above embodiment, the protrusion portion 27 is formed into a cylindrical shape, but the shape itself can be freely changed, such as a rectangular tube shape, and the connector plug 3 can be changed in accordance with the shape.
3 should be determined.

[Effect of idea]

As explained above, the electromagnetic flowmeter according to the present invention has a protrusion integrally provided on the outer edge of the connector receptacle disposed in the recess formed in the outer circumferential body of the inner pipe, and the tip surface of the protrusion is integrally provided with the protrusion. Since it is curved according to the inner diameter shape of the pipe and a taper for guiding the plug is formed on the inner surface of the tip, the connector plug can be easily inserted into the protrusion without the connector plug hitting the tip of the protrusion and getting caught. Moreover, it can be easily inserted, and the connector plug and the connector receptacle can be reliably connected. Further, the structure is simple and can be manufactured easily, and the receptacle can be made smaller than when protrusions of the same height are provided.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the electromagnetic flowmeter according to the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1,
3 to 5 are a partially cutaway front view, a plan view, and a sectional view taken along the line of FIG. 4 of the connector receptacle. 1... Exterior pipe, 2... Center hole, 3... Inner pipe,
3A...Outer body part, 4...Transducer, 7...Recessed part,
8A...electrode, 9A, 9B...excitation coil, 10
...Connector receptacle, 25a to 25d...
...Male contact, 27... Projection, 29, 30
... Taper for guiding the connector plug.

Claims (1)

[Scope of utility model registration request] In an electromagnetic flowmeter in which a recess is provided in the outer circumference of the inner tube, an excitation coil is mounted in the recess, and the excitation coil is inserted and fixed into the outer tube from the axial direction, a connector receptacle is inserted into the recess with the plug insertion side facing outward. When attached, a protrusion corresponding to the inner diameter shape of the sheathing tube is integrally provided on the surface of the receptacle, and its tip face faces the inner circumferential wall of the sheathing tube, and a connector plug guiding taper is provided inside the protrusion. An electromagnetic flowmeter characterized by being equipped with.