JPH05149458A - Switching operation device for multi-directional valve - Google Patents

Abstract

PURPOSE:To realize in simple constitution, the automation of switching operation for flow paths where a valve body is rotated after it has left a valve seat with its axis shifted even if the adhesion of viscous fluid is exerted between a conical valve body and the valve seat to be engaged therewith, and concurrently attain quicker switching operation and much more safety. CONSTITUTION:A device is equipped with a valve body axis shifting mechanism 20 which shifts the axis of a valve body 6 to a seat leaving position by exerting working fluid pressure against the spring force of a restoring spring 15 to the valve body 6, and with a valve body rotation displacing mechanism 21 which allows the valve body 6 to be rotated by a definite angle when the axis of the valve body 6 is shifted to the seat leaving position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching device for a multi-way valve used for switching control of a flow path of a highly viscous fluid handled in various facilities such as a petrochemical plant.

[0002]

2. Description of the Related Art Conventionally, as a multi-directional valve of this type, a conical valve element is fitted into a valve seat having a conical conical surface, and the valve element is rotated to make the flow path multi-directional. It is known that it can be freely switched to. By the way, when handling a highly viscous fluid as fluid, the adhesive force of the fluid acts between the valve seat and the valve body that is fitted and seated on the valve seat. Difficult to perform heavy and smooth flow path switching operation. For this reason, in the conventional method, the operator axially displaces the valve element from the seated position with respect to the valve seat to temporarily disengage the valve element, and at this position, the valve element is rotated about the axis by a predetermined angle to perform the switching operation of the flow paths. Was taken.

[0003]

However, in the conventional structure, the operation for axially displacing the valve element to the seating position and the operation for rotationally displacing the valve element to the flow path switching position are all manually performed. , It takes a lot of time and effort, and it is easy for operation mistakes to occur. Therefore, there is a demand for realization of what can achieve automation of these operations with a simple configuration.

The present invention has been made in view of the above circumstances, and has a relatively simple structure so that axial displacement and rotational displacement of the valve element can be automatically performed, and the passage switching operation can be performed in a short time. It is an object of the present invention to provide a multi-directional valve switching operation device that can be surely operated without mistake.

[0005]

In order to achieve the above object, a switching operating device for a multi-way valve according to claim 1 of the present invention comprises:
A valve seat formed of a conical conical surface, a conical valve body that is fitted into the conical seat to switch the flow path by rotating, and this valve body is closely fitted to the valve seat. A return spring for urging a return spring force in the direction, and applies a fluid pressure against the return spring force at the time of flow passage switching operation to axially displace the valve element to the seating position via the valve shaft. A valve body displacement mechanism and a valve body rotational displacement mechanism for rotationally displacing the valve body around a shaft to a predetermined flow path switching position when the valve body is axially displaced to a seating position. ..

According to a second aspect of the present invention, there is provided a switching device for a multi-way valve, which comprises one of a movable disc mounted on the valve shaft and an opposing surface of a fixed disc disposed to face the movable disc. When the valve body is rotationally displaced at the seating position and reaches a predetermined switching position, a protrusion is formed that is modestly engaged with the positioning groove formed on the other facing surface. It is configured such that the fluid pressure is reduced to the return spring force or less during the period from the start of rotational displacement at the seating position until the movable disc receives the return spring force and comes into sliding contact with the fixed disc. is there.

[0007]

According to the first aspect of the present invention, the axial displacement and the rotational operation of the valve body are automatically performed by introducing a mechanism for axially displacing the valve body by utilizing fluid pressure such as an air cylinder device. It is possible to perform a quick flow path switching operation without the risk of erroneous operation, and the use of fluid pressure simplifies the configuration as compared with one that electrically detects the valve position with a limit switch, for example. At the same time, it is possible to prevent outages due to power outages.

Further, a protrusion provided on either of the facing surfaces of the movable disk mounted on the valve shaft and the fixed disk disposed opposite to the movable disk is detently engaged with the concave groove formed on the other facing surface. By adopting such a configuration, it is possible to ensure the flow passage switching function in which the valve body that is rotationally displaced does not overrun from the predetermined flow passage switching position.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a partially cutaway front view showing a multidirectional valve switching operation device according to an embodiment of the present invention.

In FIG. 1, three outlet ports 3 (3 having a cylindrical flow path 2 are provided on a peripheral wall of a valve box 1 having a circular cross section.
(A, 3B, 3C) (FIG. 2) are arranged at equal intervals in the circumferential direction and fixed. Each inner end surface of the outlet ports 3A, 3B, 3C is formed as a valve seat 4 which coincides with a conical conical surface. Reference numeral 5 is an inlet port formed on the bottom wall of the valve box 1. Reference numeral 6 denotes a conical valve body that communicates with each of the ports 3 every time it is seated on the valve seat 4 and rotates 1/3, and is an L-shape for communicating with the outlet port 3 selected from the inlet ports 5. Communication hole 7 is formed.

8 and 9 are connected to each other so that the valve box 1
The upper and lower valve stands 10 provided upright are valve shafts supported by the valve stands 8 and 9, and are configured to be movable in the axial direction (vertical direction) and rotatable about the axial center. The valve body 6 is connected to the lower end of the valve body 6 via a pin 11 or the like.

Reference numeral 12 is an air cylinder device supported on the upper stand 8, and its piston rod 13 is constituted by the upper end portion of the valve shaft 10. Reference numeral 14 is a disk-shaped piston fitted in the cylinder 12A of the air cylinder device 12, and is fixed to the piston rod 13. Reference numeral 15 is a return spring composed of a compression coil spring interposed between the lower wall 16 which constitutes the cylinder 12A and the piston 14, and this return spring 15
Always applies an upward spring force to the piston 14, whereby the valve body 6 is lifted by the spring force and held in the seated position shown by the solid line in FIG. There is. Reference numeral 18 is a compressor for supplying compressed air a as a working fluid for piston driving between the upper wall 17 in the cylinder 12A and the piston 14 through a switching valve 19, and when the flow path is switched, Return spring 1
The compressed air a having a pressure against the spring force of 5 is supplied to the valve 6
Is configured to escape the air a from the switching valve 19 to the atmosphere when the shaft is axially displaced to the seating position shown by the chain line in FIG.
The air cylinder device 12, the compressor 18, etc. constitute a valve body axial displacement mechanism 20 for axially displacing the valve body 6 from the seated position to the seated position.

Reference numeral 21 is a valve body rotational displacement mechanism for rotationally displacing the valve body 6 by 120 ° about the axis when the valve body 6 is axially displaced to the seating position. A rotation reduction device 23 and the like for transmitting the force to the valve shaft 10 at a low speed is provided. Incidentally, reference numeral 24 is a handle used during manual operation.

Next, the operation of the above configuration will be described. Now, as the valve body 6 receives the spring force of the return spring 15,
When compressed air a is supplied into the cylinder 12A of the air cylinder device 12 in the seated position indicated by the solid line, the piston 14 is driven against the spring force of the return spring 15 and is displaced downward. Therefore, the valve element 6 is also moved downward through the valve shaft 10 and axially displaced to the seated position shown by the chain line in FIG.

If the valve body 6 is axially displaced to the seated position,
The rotation driving force of the rotation driving device 22 is transmitted to the valve shaft 10 via the rotation reduction device 23, and the valve body 6 is rotationally displaced by a certain angle. When the supply of the compressed air a to the cylinder device 12 is cut off, the piston 14 is returned by the spring force of the return spring 15, the valve body 6 is also returned, and the valve seat 6 is fitted and seated at the flow path switching position. ..

Even if the fluid supplied to the inside of the valve box 1 has viscosity, the valve element 6 is once displaced downward to disengage and then rotated when switching the flow paths, so that the fluid a adheres. The flow passage switching operation can be smoothly performed without being affected by the force, and the valve body axis displacement mechanism 20 using the air cylinder device 12 can automatically perform the displacement of the valve body 6 downward. Therefore, labor saving is achieved, and a quick switching operation can be safely performed. In addition, by using the air cylinder device 12, the position control of the valve body 6, etc.
For example, it can be performed with a simple structure as compared with an electrical position detecting means which requires a large number of limit switches.

FIG. 3 shows another embodiment of the present invention. Above the air cylinder device 12, a movable disc 31 fixed to the upper end of the piston rod 13 and a fixed disc facing the movable disc 31. The disk 32 is arranged. Both discs 3
Of the facing surfaces of 1 and 32, for example, on the movable disk 31 side, three protrusions 33 are formed at equal intervals in the circumferential direction. These projections 33 are three positioning recesses provided on the fixed disk 32 side corresponding to each port switching position as shown in FIG. 4 when the valve body 6 is rotationally driven at the seating position. It is configured to moderately engage the groove 34. The compressed air a for the air cylinder device 12 is applied to the fixed disk 32 by the return spring force by the switching valve 19 at the same time as or slightly after the valve body 6 starts to rotate from the seated position. The pressure of the return spring 15 is reduced to less than the spring force of the return spring 15 until the sliding contact is made.

That is, in the structure shown in FIG. 3, after the valve body 6 is displaced downward to the seating position by the air cylinder device 12, the valve body rotational displacement mechanism 21 rotates the shaft 6 at a constant angle (120 °). The air cylinder device 12 is rotated, but at the same time as or slightly later than the start of this rotation.
By removing the compressed air a to the piston 14, the piston 14 axially displaces upward together with the piston rod 13 by the return spring force of the return spring 15, so that the movable disk 31 rotates while slidingly contacting the fixed disk 32. Therefore, when the valve body 6 rotates by a predetermined angle, the protrusion 33 engages with the groove 34 in a moderation manner, the valve body 6 is automatically positioned at this position, and overrun is surely prevented. become.

In the above embodiment, the protrusion 33 is provided on the movable disc 31 side and the concave groove 34 is provided on the fixed disc 32 side, but it is also possible to adopt the reverse configuration. Also,
In each of the above-mentioned embodiments, the compressed air a is used as the working fluid in the valve body axial displacement mechanism 20, but other pressure fluid may be used.

[0020]

As described above, according to the first aspect of the present invention, the valve body axial displacement mechanism for axially displacing the valve body in the seated position by the working fluid pressure against the return spring force, and the valve in the seated position. With a relatively simple structure in combination with a valve body rotational displacement mechanism for rotating the body by a predetermined angle, automation of flow path switching operation can be achieved, and switching operation can be speeded up and safety can be secured.

According to the second aspect of the present invention, the protrusion provided on either one of the facing surfaces of the movable disk provided on the valve shaft and the fixed disk facing the movable disk is provided on the other facing surface. Since it is modestly engaged with the positioning groove at the flow path switching position of the valve body, overrun etc. at the time of rotational displacement of the valve body can be reliably prevented and the flow path switching operation can be reliably performed. Can be promoted.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing the structure of a multidirectional valve switching operation device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a valve body portion of the switching operation device.

FIG. 3 is a sectional view of an essential part of a switching operating device for a multi-way valve according to another embodiment of the present invention.

FIG. 4 is a development view of a movable disc and a fixed disc in FIG.

[Explanation of symbols]

 4 valve seat 6 valve body 10 valve shaft 15 return spring 20 valve body axis displacement mechanism 21 valve body rotational displacement mechanism 31 movable disc 32 fixed disc 33 protrusion 34 concave groove

Claims (2)

[Claims] 1. A valve seat having a conical conical surface, a conical valve body which is fitted into the conical seat to switch a flow path by rotating, and the valve body with respect to the valve seat. And a return spring for urging a return spring force in the direction of close contact with each other, and applying a fluid pressure against the return spring force at the time of flow path switching operation to disengage the valve element via the valve shaft. A valve body displacement mechanism for axially displacing the valve body to a position, and a valve body rotational displacement mechanism for rotationally displacing the valve body around a shaft to a predetermined flow path switching position when the valve body is axially displaced to a seating position. A switching operation device for a multi-way valve, which is characterized by being provided. 2. A valve disc is rotationally displaced at a seating position to a predetermined position on one of the facing surfaces of a movable disc mounted on the valve shaft and a fixed disc disposed so as to face the movable disc. When it reaches the switching position, the protrusion that engages with the positioning groove formed on the other facing surface in a moderation manner is formed, and the movable disc is started to be rotationally displaced at the seating position. 2. The switching device for a multi-way valve according to claim 1, wherein the fluid pressure is reduced to a value equal to or lower than the restoring spring force until the sliding force contacts the fixed disc by receiving the restoring spring force. ..