JPS6141503Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic control valve, and more particularly to a mounting structure for various accessories attached to the control valve.

Conventionally, this type of automatic control valve is constructed as schematically shown in FIG. To explain this simply, reference numeral 1 in the figure is a valve body provided in the middle of the flow path of the control fluid, and a valve body 3 is opposed to an opening 2 formed in a part of a partition wall 1a that partitions the inside of the valve body. It is arranged. 4 is an actuator supported above the valve body 1 by a pair of pillars 5 and 6 erected on the valve body 1;
A support plate 7a provided at the center of the diaphragm 7 defined in
A drive shaft 8 passing through and extending upward is fixed. Note that 9 in the figure is a spring that always urges the diaphragm 7 upward, and the lower chamber 4b of this actuator is open to the atmosphere.

Accessories such as a positioner 10, a valve opening transmitter 11, and a limit switch 12 are appropriately arranged at predetermined locations on the pillars 5 and 6.
Each detection lever 10a, 11a, 12a is connected to the drive shaft 8.

After receiving a command signal from a remote controller, the positioner 10 applies an operating pressure to the upper chamber 4 of the actuator 4 according to the current position of the valve body 3.
a, which serves to correct the position of the valve body 3 at the drive shaft 8 via the diaphragm 7 that is displaced. In addition, 13a in the figure is the wiring for the command signal,
13b is a supply pressure pipe, and 13c is an operating pressure pipe to the actuator 4.

Further, the valve opening transmitter 11 detects the current position of the valve body 3 via the drive shaft 8 and transmits it to a remote control unit via the output signal wiring 14. This signal is normally used as a monitoring target in critical control, and is also used as a reference signal when a flow rate detector (flow meter) for the fluid controlled by this valve is not provided.

Further, the limit switch 12 detects the upper and lower limit positions sandwiching the set position of the valve body 3, and sends these to a control unit at a remote location via the output signal wiring 15 to use as an alarm signal or to control the valve. It plays the role of being used as an input signal for on/off operation.

By the way, in the conventional automatic control valve with the above-mentioned configuration, each of the above-mentioned accessories 10, 11, 12
As shown in FIG. 1, the detection levers 10a, 11a, 11a, 10a, 11a, 10a, 11a, 11a, 11a, 11a, 11a, 11a, 11a, 11a, 11a, 12, 1, , and are each mounted at predetermined positions of the struts 5, 6, respectively, as shown in FIG.
12a are respectively engaged and connected to predetermined locations on the drive shaft 8. Therefore, in such a configuration, various accessories 10, 11, 12 having miscellaneous shapes may be installed in a limited installation space with the respective detection levers 10a, 11a, 12a extended, and each lever 10a, 11
A and 12a tend to cause problems such as interference with each other, resulting in unreliable detection signals. In order to assemble it so that this situation does not occur, the installation work is complicated and requires skill, and even if it is assembled successfully, there is a problem that piping and wiring for remote transmission will be crowded. It is desired that some kind of countermeasure be taken.

In view of these circumstances, the present invention eliminates restrictions on the installation of accessories such as positioners and various transmitters, greatly improves assembly efficiency, and makes layout of piping, wiring, etc. more efficient. It is an object of the present invention to provide an accessory mounting structure for an automatic control valve that can be carried out in an orderly manner and that can obtain a highly reliable detection signal.

In order to meet such demands, the accessory mounting structure of the automatic control valve according to the present invention is a detection lever for accessories such as a positioner, a valve opening transmitter, and a limit switch, which are connected to the drive shaft of the valve body for opening and closing the flow path. A support shaft with a shaft is supported by penetrating each case, and a positioner of these accessories is attached to a support on the valve body side, and the support shaft is connected to the drive shaft by an operating lever, and this The case constituting the positioner is used as a base, and the cases constituting other accessories are attached to the front side of the base with the support shafts connected coaxially so as to transmit rotation.

According to the present invention, each accessory is mounted on top of the other at the same location using the positioner as a base, and the support shafts equipped with respective detection levers are interconnected on the same axis. These support shafts can be connected to the driving shaft of the valve body with a single operating lever, which not only provides highly reliable detection signals, but also
The overall ease of assembly can be greatly improved, and piping, wiring, etc. can also be laid out in an orderly manner in the same direction.

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 2 shows an embodiment of an automatic control valve to which the accessory mounting structure according to the present invention is applied.
In this figure, the same numbers are given to the same parts as in FIG. 1, and detailed explanation thereof will be omitted.

Now, according to the present invention, other accessories, namely, the valve opening transmitter 11, The cases constituting the limit switch 12 are mounted and fixed one on top of the other, and the support shafts 20A, 20 are rotatably supported through each case.
B and 20C are connected on the same axis so that rotation can be transmitted, thereby forming a support shaft portion 20 orthogonal to the drive shaft 8 that drives the valve body. A support protruding toward the back side of the positioner 10 is provided on the support shaft portion 20 (20A, 20B, 20C) on which the cam plates 21, 22, 23 as detection levers of the accessories 10, 11, 12 are provided. By connecting the tip of the shaft 20A to the drive shaft 8 via the operating lever 24, the entire support shaft portion 20 can be rotated in conjunction with the movement of the drive shaft 8.

Note that the support shaft portion 20 is attached to each accessory 10,
Support shafts 20A and 2 supported by 11 and 12, respectively
0B, 20C, these supporting shafts 20
A, 20B, 20C are each accessory 10, 11,
When the twelve cases are mounted one on top of the other, they are reliably connected by a simple fitting operation to form the support shaft portion 20. Further, in the figure, reference numeral 25 denotes a signal conversion adjuster built into the positioner 10, the tip of the actuating rod 25a is the support adjuster, and the tip of the actuating rod 25a is the cam provided on the support shaft 20. It is engaged with the plate 21, and this support shaft portion 2
0 rotation, ie the position of the valve body via the drive shaft 8. Furthermore, in the figure, 26 is a force coil in the valve opening transmitter 11, and 27 is a micro switch in the limit switch 12, which are operated as appropriate by cam plates 22 and 23 on the support shaft 20 side, respectively. Further, the tip of the operating lever 24 is configured to be rotatable with respect to the drive shaft 8, and it goes without saying that the support shaft portion 20 can also be rotated in accordance with the downward movement.

According to such a configuration, the position of the valve body can be detected by one operating lever 24 via the drive shaft 8, the configuration is simple, and the ease of assembly can be greatly improved. Furthermore, there is no problem with the detection accuracy of each accessory 10, 11, 12. In addition, in such a configuration, the piping, wiring, etc. for each accessory 10, 11, 12 can be laid out in an orderly manner in the same direction, so the value can be improved from a commercial perspective, and the advantage is that workability is also good. There is.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part can be modified and changed as necessary.

As explained above, according to the accessory mounting structure of the automatic control valve according to the present invention, other accessory cases are mounted on the front side of the positioner case as a base, and are mounted on top of each other, and each of these cases is penetrated. The supporting shafts that are supported on the same axis are connected so as to be able to transmit rotation on the same axis, and the supporting shaft portion constituted by this is connected to the driving shaft of the valve body by one operating lever. Therefore, despite the simple and inexpensive configuration, there are no problems such as mutual interference between the levers as in the past, and restrictions on mounting accessories are eliminated, making assembly work easy and reliable. This has the practical effect of greatly improving assembly efficiency without requiring any skill. Further, according to the present invention, the piping and wiring to each accessory can be laid out in an orderly manner in the same direction, which has the advantage of being excellent in terms of workability and functionality.

[Brief explanation of drawings]

FIG. 1 is a front view showing a schematic configuration of a conventional automatic control valve, and FIG. 2 is a cross-sectional view of essential parts of an embodiment of the automatic control valve to which an accessory mounting structure according to the present invention is applied. DESCRIPTION OF SYMBOLS 1... Valve body, 3... Valve body, 4... Actuator, 5, 6... Strut, 8... Drive shaft, 10...
Positioner, 11... Valve opening transmitter, 12... Limit switch, 13, 14, 15... Piping, wiring, 20... Support shaft, 21, 22, 23... Cam plate, 24... Operating lever .

Claims (1)

[Scope of utility model registration request] Drive shaft 8 of the valve body 3 that opens and closes the flow path within the valve body 1
In an automatic control valve in which accessories such as a positioner 10, a valve opening transmitter 11, and a limit switch 12 are connected, each of the accessories 10,
Detection levers 21, 22, 23 in 11, 12
The support shafts 20A, 20B, and 20C, each of which is equipped with a On the front side of the case that is connected to the drive shaft 8 by the actuation lever 24 and constitutes the positioner 10,
The support shafts 20A, 20B, and 20C are coaxially connected to each other so that rotation can be transmitted, and other accessories 1
An accessory mounting structure for an automatic control valve, characterized in that a case comprising parts 1 and 12 is attached.