JP2000331827A - Electropneumatic signal converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an electropneumatic signal converter to be lessened in the number of component parts, size and weight and improved in handling properties. SOLUTION: A coil is provided inside a coil case 11. Two side plates 15 are each formed of magnetic material. The side plates 15 are each made to pinch the coil case 11 from the pivoting direction of a movable piece 12 coming into contact with the lengthwise surface of the movable piece 12 and the surface of the movable piece 12 opposite to its surface on the side of its edge 12a. Magnetizing blocks 13 are fixed as pinched between the side plates 15. The magnetizing blocks 13 are each made to surround the circumference of the coil case 11 together with the side plates 15 coming into contact with the surface of the coil case 11 on the edge 12a, and also to surround the edge 12a of the movable piece 12 providing a gap which enables the movable piece 12 to rotate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electropneumatic signal converter for changing a nozzle back pressure by an electric signal.

[0002]

2. Description of the Related Art As shown in FIGS. 4 to 6, a magnetic circuit portion of a conventional electro-pneumatic signal converter comprises a coil case formed of two magnetic materials 1 and 1 having a U-shaped cross section constituting a fixed iron core. 2
, The magnetic materials 1 and 1 are fixed to the coil case 2 with screws 3, and two U-shaped permanent magnets 4 and 4 are
1 and the coil case 2 are fixed with bolts 5 and these are fixed to the base 6 with screws 7. Conventional electropneumatic signal converters having such a structure are disclosed in Japanese Patent Application Laid-Open No. Hei 5-187403 and Japanese Utility Model Application Laid-Open No. Hei 3-9-1150.
There is one shown in Japanese Patent Publication No.

[0003]

However, in the prior art, the number of parts such as screws, bolts, screws, etc., is large, so that reduction in size and weight cannot be achieved, and handling is inconvenient.

The present invention has been made in view of such a conventional problem. An electro-pneumatic signal converter capable of improving the convenience of handling by reducing the number of parts and reducing the size and weight is provided. It is intended to provide.

[0005]

In order to achieve the above object, an electropneumatic signal converter according to the present invention comprises a movable piece made of a magnetic material inserted inside a coil by passing an electric signal through the coil. By generating a magnetic force on the movable piece, one end of the movable piece is attracted by a magnet provided with a gap between the movable piece, and the movable piece that is rotatable with the suction of the one end faces the nozzle. In an electro-pneumatic signal converter in which the nozzle back pressure is rotated at a position to change the nozzle back pressure, and the change in the nozzle back pressure is used as an output signal: a coil case provided with the coil therein; Two side plates for holding the case in contact with the surface along the length direction of the movable piece and the surface opposite to the one end surface, and holding the case from the rotation direction side of the movable piece; Fixed
Along with surrounding the periphery of the coil case between the side surface plate in contact with the surface on the one end side of the coil case,
A magnetizing block which surrounds the one end side of the movable piece with a rotatable gap and constitutes the magnet.

In the electropneumatic signal converter according to the present invention,
It is possible to reduce the size and weight by configuring the conventional fixed iron core and magnet with the side plate and the magnetized block.
In the case of attaching to the base, the side plate is sandwiched between the base and the coil case, and they are fixed together by a fixing member such as a screw, so that the number of fixing members can be reduced and the size and weight can be reduced. .

In the electro-pneumatic signal converter according to the present invention, the magnetized block is formed by stacking a plurality of magnetic plates having the same thickness along each side plate, and a permanent magnet between the magnetic plates on both sides of the movable piece. It is preferable that it is sandwiched. In this case, the size of the permanent magnet can be reduced, and the size and weight can be reduced. The magnetic plate may be made of the same material as the side plate. The permanent magnet is arranged with a polarity such that one end of the movable piece can be attracted to the magnetic plate so as to change the nozzle back pressure by rotating the movable piece.

In the electropneumatic signal converter according to the present invention, there is provided a spring for adjusting the one end of the movable piece to a position away from the attraction side of the magnet, wherein the spring is attached to a mounting member, It is preferable that the mounting member is fixed to each side plate by a bolt, and the bolt penetrates each side plate and the magnetized block and fixes the magnetized block to each side plate by a nut. In this case, by fixing the spring mounting member, the side plates, and the magnetized block together, the number of fixing members such as screws can be reduced, and the size and weight can be reduced.

[0009]

1 to 3 show an embodiment of the present invention. As shown in FIGS. 1 to 3, an electropneumatic signal converter (electropneumatic valve positioner) includes a coil case 11, a movable piece 12, a magnetized block 13, a base, and a magnetic circuit unit (torque motor). 14, two side plates 15, a mounting member 16, and a spring 17. A coil is provided inside the coil case 11. The coil housing portion 11a of the coil case 11 has a rectangular parallelepiped shape. In the coil case 11, the coil is sealed in a synthetic resin material to reduce the weight.

The movable piece 12 is made of a magnetic material and is inserted into the center of the coil. The movable piece 12 generates a magnetic force by passing an electric signal through a coil. Movable piece 12
The one end 12a side of the movable piece 12a
Is attracted to the magnetized block 13 provided with a gap.
The other end 12 b of the movable piece 12 is attached to the base 14. As the movable piece 12 is suctioned on one end 12a side,
Rotate to change the nozzle back pressure at a position facing a nozzle (not shown). The electropneumatic signal converter operates a pilot valve (not shown) using the change in the nozzle back pressure as an output signal. The pilot valve moves the stem of an actuator (not shown), and the stem acts on the movable piece 12 via a feedback spring,
It keeps the movement of the stem in balance.

Each side plate 15 is made of a magnetic material having an L-shaped cross section and having a vertical seat plate 15b at one end of a main body plate 15a. Each side plate 15 is in contact with the surface 11b of the coil case 11 along the length direction of the movable piece 12 by the main body plate 15a, and is opposite to the surface 11c of the movable piece 12 of the coil case 11 on one end 12a side by the seat plate 15b. Touches 11d. As a result, each side plate 15 moves the coil case 11 to the movable piece 1.
2 from the rotation direction side. Each side plate 15 is arranged apart from each other. Each side plate 15 and coil case 11
Are fixed to the base 14 by screws 18 passing through the seat plate 15b of the side plate 15.

The magnetization block 13 includes a plurality of magnetic plates 13a.
The two permanent magnets 13 are arranged between the magnetic plates 13a on both sides of the movable piece 12 as shown in FIG.
b. As the permanent magnet 13b, a permanent magnet 13b having a smaller size and a higher coercive force than that used in a conventional electropneumatic signal converter is used. The magnetic plate 13a is a side plate 1
The same plate material as that of No. 5 is processed, and is made of a magnetic material having high magnetic permeability. The magnetization block 13 is fixed by being sandwiched between the side plates 15. Each magnetic plate 13a of the magnetized block 13
And each side plate 15 is magnetized by the permanent magnet 13b, and comprises a fixed iron core. The permanent magnet 13b includes the movable piece 1
2 is movable so as to change the nozzle back pressure by rotating
The one end 12a side of 2 is arranged with the polarity which can be attracted to the magnetic plate 13a. That is, in FIG. 1, for example, if the left magnetic plate 13a of the movable piece 12 has the N pole, the right magnetic plate 13a has the S pole. The magnetized block 13 is in contact with the surface of the coil case 11 on the one end 12a side and surrounds the periphery of the coil case 11 between the side plate 15 and the movable plate 12 with a gap rotatable around the one end 12a side of the movable piece 12. Siege.

The spring 17 is attached to the mounting member 16 by a screw 19.
Attached to. The spring 17 is a movable piece 1 at an intermediate portion.
The movable piece 12 is attached to the one end 12a side of the magnet 2 so as to adjust the movable piece 12 to an intermediate position separated from the magnet suction side. The mounting member 16 is fixed to each side plate 15 by bolts 20. Bolt 2
Numeral 0 penetrates through each side plate 15 and the magnetized block 13 together with the mounting member 16, and is fastened by a nut 22 via a spring washer 21. Thereby, the magnetization block 13 is fixed to each side plate 15.

Next, the operation will be described. The electropneumatic signal converter can be reduced in size and weight by forming the conventional fixed iron core and magnet with the side plate 15 and the magnetized block 13. When attaching to the base 14, the side plate 15 is interposed between the base 14 and the coil case 11, and these are fixed together with the screws 18, thereby reducing the number of fixing members such as screws and reducing the size and weight. Can be planned.

The magnetized block 13 includes a magnetic plate 13a.
Since the permanent magnet 13b is sandwiched between them, the size of the permanent magnet 13b can be reduced, and the size and weight can be reduced. Since the magnetized block 13 can be manufactured by overlapping the magnetic plates 13a, processing is easy. Each magnetic plate 13a and each side plate 15 of the magnetization block 13 have the same shape as the conventional fixed core, there is no difference in the magnetic circuit structure from the conventional fixed core, and there is no problem in the magnetic transmission characteristics. Also, in the electro-pneumatic signal converter, one of the two permanent magnets used in the conventional electro-pneumatic signal converter does not need to be provided mechanically, so that it is compact, and the side plate is L-shaped. The efficiency of magnetic permeability is improved, and the performance as a torque motor is improved. In addition, by fixing together the mounting member 16 of the spring 17, each side plate 15 and the magnetized block 13 with the bolt 20 and the nut 22, the number of fixing members such as screws can be reduced, and the size and weight can be reduced. .

In the conventional electro-pneumatic signal converter, the size and size of the magnet and fixed core of the magnetic circuit (torque motor) are large, and the coil case is also made of metal, so that the size can be reduced. And has a considerable weight.
In order to reduce the size while securing the performance as an electropneumatic signal converter, it is necessary to change the shape of each part and reduce the number of parts. According to the electropneumatic signal converter, it is possible to achieve compactness by making some of the components multifunctional, and to improve seismic resistance and handleability by reducing the size and weight. In particular, according to the electropneumatic signal converter, the connection of each part can be diversified by giving the side plate 15 a role as a connecting member in addition to a role as a magnetic circuit (torque motor). The number of parts can be reduced by reducing the number of fixing portions.

[0017]

According to the electropneumatic signal converter according to the present invention, the number of components such as fixing members can be reduced, and the convenience of handling can be improved by reducing the size and weight.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a magnetic circuit section of an electropneumatic signal converter according to an embodiment of the present invention.

FIG. 2 is a bottom view showing a magnetic circuit unit of the electropneumatic signal converter of FIG. 1;

FIG. 3 is a front view showing a fixed core of the electropneumatic signal converter of FIG. 1;

FIG. 4 is a longitudinal sectional view showing a magnetic circuit section of a conventional electropneumatic signal converter.

FIG. 5 is a bottom view showing a magnetic circuit section of a conventional electropneumatic signal converter.

FIG. 6 is a side view showing a magnetic circuit section of a conventional electropneumatic signal converter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Coil case 12 Movable piece 13 Magnetization block 14 Base 15 Side plate 16 Mounting member 17 Spring

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Kawabata 5-2 Kameoka, Ohira-mura, Kurokawa-gun, Miyagi Pref. F-term in Kazo Factory Co., Ltd. (reference) 3J001 AA02 BA01 DA00 DB04 EA02 5E048 AB10 AC05 AD12 5H633 BB07 BB11 GG02 GG06 GG09 GG16 HH02 HH05 HH09 HH13 HH16 HH25 JA06 JB07

Claims (3)

[Claims] An electric signal is caused to flow through a coil to generate a magnetic force on a movable piece made of a magnetic material inserted inside the coil, thereby providing one end of the movable piece with a gap between the movable piece. The movable piece, which is made rotatable with the suction of the one end side, is rotated to change the nozzle back pressure at a position facing the nozzle, and the change in the nozzle back pressure is used as an output signal. In the pneumatic signal converter, a coil case provided with the coil therein, and each of the coil case is made of a magnetic material, and the coil case has a surface along a length direction of the movable piece and a surface opposite to the surface on the one end side. And two side plates sandwiched from the rotating direction side of the movable piece, fixed between the side plates, and in contact with the one end surface of the coil case, between the side plates. When surrounding the coil case Moni, the one end of the movable piece surrounding at a pivotable gap, and a magnetic block constituting the magnet, an electric-pneumatic signal converter, characterized in that it comprises. 2. The magnetic block, wherein a plurality of magnetic plates having the same thickness are stacked along each side plate, and a permanent magnet is sandwiched between the magnetic plates on both sides of the movable piece.
The electropneumatic signal converter according to claim 1, wherein: 3. A spring for adjusting said one end side of said movable piece to a position separated from a suction side of said magnet, said spring being attached to a mounting member, said mounting member being fixed to each side plate by bolts. 3. The electropneumatic signal converter according to claim 1, wherein the bolt penetrates each side plate and the magnetized block, and the magnetized block is fixed to each side plate by a nut.