JP2000193133A - Locking device for butterfly valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking device for a directly operated butterfly valve, which can lock a posture of a valve plate by elastic engagement, release and set the locking mechanism during operation of the valve, and operate the valve with single operation. SOLUTION: A disc 21 which is elstically rotated unitedly with an operation shaft 11 and pressed down and energized by means of a belleville spring 22 is arranged on the operation shaft 11 for opening and closing a valve plate 4 of a butterfly valve, so as to be faced to a fixed portion on the side of a valve main body 1. A plurality of recessions are formed on one of the disc 21 and the fixed poriton on the valve main body 1 side opposed to each other, spaced with specified intevals on the same circumference around an axis of the operation shaft 11. On the other of the opposed surfaces, balls 23 corresponding to the recessions in number and arragement are formed so as to elastically and disengageably engage with the recessions. The recessions and the balls 23 are elastically engaged and disengaged with each other during operation of a the valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve for opening and closing a conduit for transporting various fluids, wherein the position of a valve plate is locked by resilient engagement, and the valve plate is operated in a locking operation. The present invention relates to a butterfly valve locking device capable of releasing and setting a mechanism.

[0002]

2. Description of the Related Art A general structure of a butterfly valve for opening and closing a pipeline for transporting various fluids is such that a disc-shaped valve plate is attached to an operation shaft penetrating the inside of a valve body, and externally via the operation shaft. The valve plate is rotated to open and close the conduit.

In such a butterfly valve, the maximum opening degree is obtained when the valve plate is turned by 90 ° from a closed state in which the valve plate is in contact with the valve seat, and the posture of the valve plate is maintained.
A lock mechanism is required.

In a conventional butterfly valve in which a worm speed reducer is provided between an operation shaft and an operation handle, the reverse rotation prevention function of the speed reducer also serves as a lock mechanism. In the direct operation type butterfly valve for rotating the valve, it is necessary to separately provide a lock mechanism in order to maintain the posture of the valve plate.

FIG. 5 shows an example of a lock mechanism in a conventional direct operation type butterfly valve. An operation shaft 32 for rotating the valve plate is rotatably supported by a valve body 31 containing the valve plate. An operation handle 33 is attached to the upper end of the shaft 32, and an opening plate 34 is fixed to the upper surface of the valve body 31, and an opening plate is attached to the tip of a lever 35 pivotally mounted on the lower portion of the operation handle 33 so as to be swingable. A lock claw 37 is provided between the operating handle 33 and the lever 35, and the lock claw 37 is engaged with the lever 35 in the direction in which the lock claw 37 is always engaged with the notch 36 of the opening plate 34. Is provided with a spring 38 for biasing the spring.

This locking mechanism locks the valve plate by engaging a lock claw 37 with a notch 36 of the opening plate 34, and when operating the valve plate, grasps the lever 35 and pushes the locking claw 37 of the opening plate 34. The operating handle 33 is operated while being detached from the notch 36 and maintaining the unlocked state.

[0007]

By the way, in the above-mentioned conventional direct operation type butterfly valve, when the valve is to be operated, an operation for releasing the lock of the lock mechanism is required before the valve operation. There is a problem that the valve cannot be operated by the operation, which is inconvenient at the time of urgent valve operation.

Accordingly, an object of the present invention is to lock a directly operated butterfly valve which can release and set a lock mechanism in an operation of locking a valve plate by elastic engagement and operating a valve. It is to provide a device.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a part of an operation shaft for opening and closing a valve plate of a butterfly valve, the part being rotated integrally with the operation shaft. Is provided so as to face the fixed portion on the valve body side, and a predetermined portion is provided on one of the opposing surfaces of the rotating portion and the fixed portion on the valve body side on the same circumference around the axis of the operation shaft. A configuration in which a plurality of recesses arranged at intervals are formed, and on the other side of the opposing surface, engaging elements are provided which are releasably and elastically engaged with the recesses and have the number and arrangement corresponding to the recesses. Is adopted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

In the first embodiment shown in FIGS. 1 to 3, a direct operation type butterfly valve comprises a metal valve body 1, a valve seat 2 provided on the inner peripheral surface of the valve body 1, It comprises a rotatable shaft 3 penetrating through the valve body 1 in the radial direction, a valve plate 4 fixed to the shaft 3, and an exterior part 5 made of polyethylene or the like covering the valve body 1.

The valve body 1 has a cylindrical shape having a fluid passage 6 therein, and is formed by providing support cylinders 7 and 8 for a shaft 3 at upper and lower positions on an outer peripheral surface thereof. One fluid passage 6 penetrates in the radial direction, and upper and lower ends are rotatably supported by support cylinders 7 and 8.

The valve seat 2 is formed in a ring shape to be fitted on the inner peripheral surface of the cylindrical portion of the valve body 1, and is hermetically fixed at a position downstream of the fluid passage 6 in the cylindrical portion. Is fixed to a portion of the shaft 3 located in the fluid passage 6,
The figure shows an example in which it is formed in the shape of a disk having an outer diameter fitted into the valve seat 2 and, in the case of the drawing, a seal ring 9 is provided on the outer periphery thereof.

The valve plate 4 closes the fluid passage 6 at a position where it fits into the valve seat 2, and when the valve plate 4 is rotated by 90 ° together with the operating shaft from this position, the fluid passage is fully opened. The attachment of the valve plate 4 to the shaft 3 has a double eccentric structure so that the rotation of the valve plate 4 can be performed without any trouble.

On the upper part of the valve body 1, a shaft 3
An operation unit 10 for rotating the valve body 4 through the control unit is provided. The operation unit 10 connects an operation shaft 11 to the upper end of the shaft 3 so as to rotate integrally with a key connection,
A cap 12 externally fitted to the operation shaft 11 is fixed to the upper end of the support cylinder 7, and a lock mechanism 13 for the valve plate 4 is provided between the operation shaft 11 and the upper end of the support cylinder 7.

The operating shaft 11 is housed in the cap 12 and is keyed to the upper end of the shaft 3 by a key. The operating shaft 11 is provided at the upper end of the cam portion 14 so as to protrude above the cap 12 so as to be coaxial with the shaft 3. The valve plate 4 is rotated by engaging a tool with the square shaft portion 15.

As shown in FIG. 2, the cam portion 14 has two straight surfaces 16 and 17 at right angles, and the cap 12 has a stopper 1 against which the straight surfaces 16 and 17 abut by rotation.
8 and 19 are attached, the rotation angle of the valve plate 4 is restricted to 90 °, and when one straight surface 16 abuts against one stopper 18 as shown, the valve plate 4 abuts on the valve seat 2. When the fluid passage 6 is closed and the valve plate 4 is rotated 90 ° from this state to bring the other straight surface 17 into contact with the other stopper 19, the fluid passage 6 is fully opened.

The lock mechanism 13 is for holding the closed position and the fully open position of the valve plate 4, and is provided on the shaft 3 between the upper end surface of the support cylinder 7 and the lower surface of the cam portion 14 of the operation shaft 11. A fixed seat 20 fixed to the upper end surface of the support cylinder 7 in an externally fitted state, and located between the fixed seat 20 and the lower surface of the cam portion 14, and integrated with the shaft 3 in an externally fitted state to the shaft 3. And a disc spring 22 which is keyed so as to be rotatable and movable in the axial direction, and a disc spring 22 which is contracted between the disc 21 and the lower surface of the cam portion 14 and pushes the disc 21 down toward the fixed seat 20. And a plurality of balls 23 which are engaging elements incorporated between the disk 21 and the fixed seat 20.

The fixed seat 20 is provided with a total of four circular holes 14 rotatably holding the balls 23 at 90 ° arrangement intervals on the same circle centered on the axis of the shaft 3. The lower surface of the plate 21 has the same number and arrangement conditions as the circular holes 24, and is provided with a total of four concave portions 25 which are externally engaged with the balls 23 held by the circular holes 24. Due to the pressing force applied to the disc 21 by the spring 22, the ball 23 elastically engages with the ball 23 to thereby elastically lock the closed position and the fully opened position of the valve plate 4.

FIG. 4 shows a second embodiment in which the structure of the lock mechanism 13 is different. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description will not be repeated.

In the second embodiment, an operation shaft 11 similar to the first embodiment is connected to the upper end of the shaft 3.
A total of four circular holes 26 are provided at 90 ° intervals on the same circle centered on the axis of the shaft 3 on the upper end surface of the support cylinder 7, and a ball 27 and the ball 27 are placed in the circular holes 26. The push-up spring 28 is housed, and the cam portion 1 of the operation shaft 11 is housed.
4 has the same number and arrangement conditions as those of the circular hole 26, and a total of four concave portions 29 which are externally engaged with the ball 27 accommodated in the circular hole 26 are provided.
7, so that the closed position and the fully open position of the valve plate 4 are elastically locked.

Note that the ball 2 in the first embodiment
3 and the number of the recesses 25, the circular holes 2 in the second embodiment.
The number of 6 and the balls 27 is not limited to four, but can be freely increased or decreased.

The lock mechanism according to the present invention is configured as described above, and its operation will be described based on the first embodiment.

As shown in FIGS. 1 and 2, when the valve plate 4 is in the valve closed state, the concave portion 25 of the disk 21 connected to the shaft 3 is resilient to the ball 23 as shown in FIG. And the closed position of the valve plate 4 is elastically locked.

When the valve plate 4 is turned toward the fully open position via the operating shaft 11, the disk 21 connected to the shaft 3 turns integrally, as shown in FIG. 3B. When the pivot 21 rotates, the concave portion 25 comes off the ball 23 and the disc 2
1 rides on the ball 23, and the disc 21 is a disc spring 2
2 is lifted by compression, which unlocks it and allows the valve plate 4 to pivot via the operating shaft 11.

When the valve plate 4 is rotated by 90 ° to the valve open position, each concave portion 25 of the disk 21 is fitted to the adjacent ball 23 to elastically lock the fully open position of the valve plate 4. Thus, the valve closing position and the fully open position of the valve plate 4 are
5 and the ball 23 can be held elastically.

As described above, when the butterfly valve is operated by the operation shaft 11, the lock mechanism 13 can be released and set during this operation, and the valve can be operated in one operation.

[0028]

As described above, according to the present invention, the operating shaft for opening and closing the valve plate of the butterfly valve is provided so that the portion that rotates integrally with the operating shaft faces the fixed portion on the valve body side. A plurality of recesses arranged at predetermined intervals on the same circumference centered on the axis of the operating shaft on one of the opposed surfaces of the rotating portion and the fixed portion on the valve body side,
On the other side of the opposing surface, there is provided an engaging element which is detachably and resiliently engaged with the concave portion and has a number and an arrangement corresponding to the concave portion. Since the lock mechanism can be released and set in the device, and the valve operation can be performed in one operation, the valve operation in an emergency can be performed quickly.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a butterfly valve provided with a lock mechanism according to a first embodiment.

FIG. 2 is a cutaway plan view of a main part of the above.

FIG. 3A is an enlarged sectional view showing a locked state of a lock mechanism, and FIG. 3B is an enlarged sectional view showing an unlocked state of the lock mechanism.

FIG. 4 is a longitudinal sectional view showing a lock mechanism according to a second embodiment.

5A is an enlarged sectional view showing a lock mechanism in a conventional butterfly valve, and FIG. 5B is a plan view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 2 Valve seat 3 Shaft 4 Valve 7 Support cylinder 8 Support cylinder 10 Operation part 11 Operation shaft 12 Cap 13 Lock mechanism 20 Fixed seat 21 Disk 22 Disc spring 23 Ball 24 Circular hole 25 Depression 26 Circular hole 27 Ball 28 Spring 29 recess

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroshi Koiwa 2-3-111, Noribori, Nishi-ku, Osaka-shi Inside the cooperative association (72) Inventor Hiroshi Shimizu 5-1-161 Torishima, Konohana-ku, Osaka Osaka Gas (72) Inventor Masahiro Yamada 5-11-61 Torishima, Konohana-ku, Osaka-shi Osaka Gas Co., Ltd. F-term (reference) 3H052 AA02 BA35 CD09 EA02 3H064 AA02 AA07 BA06 CA04 CA09 CA12 DA02

Claims (1)

[Claims] 1. A part of an operation shaft for opening and closing a valve plate of a butterfly valve, wherein a part that rotates integrally with the operation shaft is provided so as to face a fixed part on a valve body side, and the part that rotates is provided. On one of the opposed surfaces of the fixed portion on the valve body side, a plurality of recesses are formed at predetermined intervals on the same circumference around the axis of the operating shaft, and on the other side of the opposed surface, the recess is formed. A butterfly valve locking device provided with engaging members which are detachably and elastically engaged with each other and have a number and arrangement corresponding to the concave portions.