JPH10318392A - Driving device for emergency shutdown valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device for an emergency cut-off vale, an adapted lock releasing device and an adapted locking system, which contribute to the miniaturization of the whole of a device, and concurrently increase its safety. SOLUTION: It is so constituted that this driving device is provided with an emergency cut-off valve capable of being moved between a first position where the passing condition of fluid within a fluid tube is one as specified, and a second position where the passing condition of fluid is different from the aforesaid one as specified, and with a locking mechanism 4 locking the emergency cut-off valve at the first position. In this case, the locking mechanism 4 is provided with a piston rod 11 driving the emergency cut-off valve from the first position to the second position, balls 26 capable of being moved integrally with the piston rod 11, and with an outer ring 29 provided with a recessed part which locks the emergency cut-off valve at the first position by preventing the balls 26 from being moved. Therefore, let the emergency cut-off valve be moved from the first position to the second position by releasing the checked condition the balls 26 by the outer ring 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shutoff system which is movable between a first position in which a fluid passage state in a fluid pipe is in a predetermined state and a second position in which the state is different from the predetermined state. The present invention relates to a drive device for an emergency shut-off valve having a lock mechanism for locking the valve at the first position.

[0002]

2. Description of the Related Art FIG.
This will be described with reference to FIGS. FIG. 11 shows an arrangement of the seismic storage tank 70 and the emergency cutoff valve driving device 71 in the case of a water pipe. The flow of water in the normal state follows the arrow shown by the solid line in FIG. Water flows in the order of With such a flow, fresh water is always supplied to the storage tank 70. Then, when an abnormality such as a water pipe rupture occurs due to an earthquake, accident or other disaster, the emergency shutoff valve in the device 71 is activated by detecting a drop in water pressure, and the flow of water to the storage tank 70 is shut off. I do. At the time of this abnormality, the flow of water follows the arrow indicated by the broken line in FIG.
Water flows in the order of 2 → branch pipe 73 → apparatus 71 → branch pipe 76 → main pipe 77.

The details of the conventional emergency shut-off valve driving device 71 will be described with reference to FIGS. FIG. 12 shows branch pipes 73 to 7.
6, FIG. 13 is a view as viewed from a direction along the branch pipes 73 to 76, FIG. 14 is a cross-sectional view taken along the line IV-IV of FIG.
FIG. 15 is a sectional view taken along line VV of FIG. Between the branch pipe 73 and the branch pipe 74 and between the branch pipe 75 and the branch pipe 76, a valve cylinder 84 functioning as an emergency shut-off valve is provided rotatably by a support shaft 78. As shown in FIG.
5 and the branch pipe 76 are allowed to flow.
In the event of an abnormality, the valve cylinder 84 is rotated clockwise by 90 degrees from the position shown in FIG. Thus, the water flowing through the branch pipe 73 immediately flows to the branch pipe 76 via the valve sleeve 84. The space where the valve cylinder 84 operates is covered by a cover body 82. Next, an outline of a mechanism for driving the valve cylinder 84 will be described.
Reference numeral 9 functions as a sensor for detecting the water pressure of each branch pipe. The weight 81 shown in FIG. 13 is integrally and rotatably attached to a support shaft 78 coaxial with the valve cylinder 84. The weight 81 is about to rotate clockwise in FIG. 13 due to gravity, but its movement is prevented by the stopper pin 80.

[0004] When the water pressure drops at the time of an abnormality, the stopper pin 80 is driven by the hydraulic cylinder 79, and the weight 81 rotates 90 degrees clockwise and moves to the position shown by the two-dot chain line in FIG. As a result, the valve cylinder 84 also moves from FIG.
, The emergency shut-off valve is activated, and the water flow changes from the normal state shown in FIG. 11 to an abnormal state. To return to the normal state from the abnormal state, the cylinder device 8 shown in FIG.
By driving the weight 3, the weight 81 may be returned to the original position. For convenience of explanation, the position of the valve in a normal state is referred to as a normal state (normal position), and the position of the valve in an abnormal state is referred to as a shut-off state (cut-off position).

[0005]

The problem with the prior art described above is that the weight of the device, which is large in size and weight, is operated, so that the size of the entire apparatus is increased.
Therefore, when installing the apparatus, the amount of excavation in the soil was considerable. Further, when a worker is near the apparatus, there is a risk of injury if a heavy weight is activated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drive device for an emergency shutoff valve, which contributes to downsizing of the entire device and enhances safety.

[0007]

In order to achieve the above object, a driving device for an emergency shutoff valve according to the present invention has the following features.
A first method for setting the passage state of the fluid in the fluid pipe to a predetermined state
An emergency shutoff valve movable between a position and a second position that is different from the predetermined state, and a lock mechanism that locks the emergency shutoff valve at the first position. A lock mechanism configured to drive the emergency shutoff valve from the first position to the second position;
A first ball member movable integrally with the first drive shaft member; and a first movement preventing member that locks the emergency shut-off valve at a first position by preventing movement of the first ball member. The emergency shut-off valve is moved from the first position to the second position by releasing a blocking state of the first ball member by the first movement preventing member.

According to this, the basic structure of the lock mechanism is composed of the (first) drive shaft member, the (first) ball member, and the (first) movement preventing member. In particular, a drive shaft member is used, and by arranging it along the fluid pipe, efficient arrangement can be achieved, which can contribute to downsizing of the device. Further, the drive of the first drive shaft member can be mechanically controlled by setting the first ball member (such as a sphere or a columnar body) to the position of the blocking state or the position of the state where the blocking is released. Since the ball member has a relatively small size and can be easily manufactured, this also contributes to downsizing of the entire apparatus. Further, by casing the drive shaft member and the ball member, unlike the operation of the weight in the related art, the operation portion of the lock device can be configured inside the device. Therefore, the above configuration contributed to downsizing of the entire device and improved safety. In addition, since the operating portion is formed inside the device, the function of preventing mischief can be enhanced.

As an embodiment of the driving device according to the present invention,
The ball holding member is held by a ball holding body integrally coupled to the first drive shaft member, and the first drive shaft member is pressed against the first ball against the first movement preventing member. A first ball pressing member, wherein the first ball pressing member has a first portion for pressing the first ball member against the first movement preventing member, and the first ball member has the first movement preventing member; And a second portion that can escape from the vehicle. According to this, the ball pressing body can be attached so as to be relatively movable with respect to the drive shaft member. Then, in a normal state, the ball member is pressed by the first portion to maintain the locked state, and at the time of an abnormality, the ball pressing body is driven to drive the ball member.
The ball member is allowed to escape to the second portion, whereby the unlocked state can be obtained.

The driving device for an emergency shut-off valve according to the present invention preferably has a lock release mechanism described below. That is, a second drive shaft member for releasing the blocking state of the first ball member by the first movement blocking member, a second ball member movable integrally with the second drive shaft member, A second movement preventing member that locks the second drive shaft member by preventing the movement of the two ball member, and releases the blocking state of the second ball member by the second movement preventing member. The second drive shaft member is driven, whereby the first ball member
The blocking state by the movement blocking member is released.

The basic structure of the lock release device is the same as that of the lock mechanism, and includes a (second) drive shaft member, a (second) ball member, and a (second) movement preventing member. . In particular, a drive shaft member is used, and by arranging it along the fluid pipe, efficient arrangement can be achieved, which can contribute to downsizing of the device. Further, the drive of the second drive shaft member can be mechanically controlled by setting the second ball member (such as a sphere or a column) to the position of the blocking state or the position of the state where the blocking is released. Since the ball member has a relatively small size and can be easily manufactured, this also contributes to downsizing of the entire apparatus. By casing the drive shaft member and the ball member, unlike the operation of the weight in the related art, the operation portion of the lock release mechanism can be configured inside the device. Therefore, it was also possible to contribute to downsizing of the entire apparatus and to enhance safety.

Further, as an embodiment of the lock release mechanism according to the present invention, the second drive shaft member is a second drive shaft,
The second drive shaft holds the second ball member, and includes a second ball pressing member that presses the second ball member against the second movement preventing member. The second ball member may include a first portion for pressing the second ball member against the second movement preventing member, and a second portion where the second ball member may escape from the second movement preventing member. .

Further, as an embodiment of the lock release mechanism according to the present invention, a cylindrical member to which the second drive shaft member is slidably mounted and the second movement preventing member is integrally mounted, A first urging means for urging the second drive shaft member in a direction protruding from the cylindrical member, and a fluid pressure detection unit attached integrally with the cylindrical member to detect a decrease in fluid pressure of the fluid A second urging means for urging the fluid pressure detecting member, the cylindrical member, and the second drive shaft member integrally in the same direction as the projecting direction; and (2) The blocking state of the second movement preventing member is released by the biasing force of the biasing means, and then the second drive shaft member is protruded from the cylindrical member by the first biasing means. And thereby the first Preferably, so as to release the blocking state by the first movement preventing member of seal member.

According to this structure, when the fluid pressure of the fluid pipe decreases at the time of abnormality, the urging force of the second urging means firstly causes
The fluid pressure detecting member, the cylindrical member, and the second drive shaft member are driven integrally. Then, the second movement inhibiting member integrally attached to the cylindrical member is also driven, and the inhibition state of the second ball member by the second movement inhibiting member is released. Thereby, the second drive shaft member is further driven by the first urging means in the direction in which the second drive shaft member protrudes from the cylindrical member. As a result, the blocking state of the first ball member of the lock mechanism by the first movement blocking member can be released, and the locked state can be released. A considerable force is required to release the lock of the lock mechanism. However, the first urging means having a relatively small urging force releases the blocking state of the second ball member by the second movement preventing member.
The second drive shaft member is driven by a second biasing means having a relatively large biasing force and a biasing force sufficient to release the locked state of the lock mechanism, and functions as a booster mechanism. It is.

Other features and advantages of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing the entire emergency cutoff valve driving device. In this figure, the valve is in an abnormal state (unlocked state). This device is roughly divided into a manual pump section 1, a piston rod drive spring storage section 2, a motion conversion section 3 for converting a linear motion of the piston rod 11 into a rotary motion, a lock mechanism section 4, and a lock release mechanism section. 5 Note that the configuration of the emergency shutoff valve can be the same as that shown in FIGS. 12 to 15 described in the related art, so description thereof will be omitted here. When the emergency shut-off valve completes the operation from the normal state (locked state) to the abnormal state (unlocked state) in an emergency, the manual pump unit 1 moves the handle 10 to the shaft center 1.
The emergency shutoff valve (hereinafter, simply referred to as a valve) is returned to its original normal state by swinging around 0a.

The piston rod driving spring storage section 2 stores a piston rod driving spring 12 for urging the piston rod 11 to the left in FIG. 1, ie, to close the valve. One end of the piston rod driving spring 12 is attached to a spring receiving member 13 which also functions as a case member of the apparatus, and the other end is attached to another end 11 a of the piston rod 11 by a nut 15. , Respectively. Tip 11a of piston rod 11
Abuts on the adjuster 16.

The motion converting section 3 has a squatch yoke 17 for operating a valve. A trunnion 18 attached to the piston rod 11 is fitted in a U-shaped groove 17a formed in the squatch yoke 17. . Manual pump 1
Is operated to return the piston rod 11 to the original position, the trunnion 18 moves to the position indicated by 18 ', whereby the valve returns to the normal state. This mechanism converts a linear motion into a rotary motion, and is called a squatch yoke mechanism. A large torque is output at the start, and ideal torque output characteristics can be exhibited. The guide body 6 is provided for slidingly guiding the piston rod 11. In FIG. 1, when the manual pump 1 is operated, oil is pumped into the space on the right side of the guide body 6. Thereby, the lock mechanism 4 that has been moved to the position shown by the solid line in FIG. 1 is returned to the position shown by the two-dot chain line. The lock mechanism 4 is provided with a mechanism for locking the valve in a normal state. The lock release mechanism 5 is a mechanism for releasing the lock when an abnormality occurs and shifting the valve from an abnormal state to a normal state. These mechanisms 4 and 5 will be described in detail below.

One of the features of this device is that operating parts such as the piston rod 11, the lock mechanism 4, the lock release mechanism 5 and the like are built in and cannot be seen from the outside. This has the advantage that malfunctions due to the occurrence of external mischief or rust are prevented.

[Description of Lock Mechanism] FIG. 2 is an enlarged view of the lock mechanism 4. Here, for the sake of simplicity, only necessary parts are shown. Piston rod 1
A ball holder 19 is fixedly attached to one end by a screw 19e. The inside of the first outer peripheral portion 19c of the ball holder 19 comes into sliding contact with a cylindrical body 21 formed in a cylindrical shape. A ring member 22 made of Teflon and a U-shaped rubber packing 23 whose surface is coated with Teflon are provided on the first outer peripheral portion 19c of the ball holder 19. Cylinder body 21
It is these Teflon parts that are actually in contact with the inner surface of the Teflon. A recess 19a is formed inside the ball holder 19 as a space for accommodating the ball pressing body 24, and a steel ball is inserted into a hole 19b penetrating between the recess 19a and the second outer peripheral portion 19d. 26 are stored. The outer diameter of the second outer peripheral portion 19d is smaller than the outer diameter of the first outer peripheral portion 19c.

The above-described ball pressing body 24 is slidably mounted in the recess 19a at the extreme end of the piston rod 11, and the ball pressing body 24 is separated from the extreme end of the piston rod 11 by a spring 25. Biased in the direction. The spring 25 is housed in a space defined by a concave portion 11b formed at the tip of the piston rod 11 and a concave portion 24a of the ball pressing body 24.

A ring 27 is slidably provided on the second outer peripheral portion 19d of the ball holder 19. The ring body 27 has a first end 27a with which one end of a spring 28 abuts.
, A second end 27b, and a recess 27c with which the outer surface of the ball 26 abuts when the lock is released. The outer ring 29 has an end portion 29a with which the second end portion 27b of the ring body 27 abuts and a concave portion 29 with which the ball 26 abuts.
b. The outer ring 29 is fixedly attached to the fixed base 20. The fixed base 20 is attached to an end of the cylinder body 21. The spring 28 urges the second end 27b of the ring body 27 in a direction in which it contacts the end 29a of the outer ring 29. The end surface 24b of the ball pressing body 24 is configured to be pressed by a push rod 30 provided in the lock release mechanism 5 described later. In the state of FIG. 2, a slight gap is provided between the distal end of the push rod 30 and the end face 24b.

The fixed base 20 is provided with breathing holes 20a and 20b, and by eliminating internal pressure fluctuations,
The movement of the ball holder 19 and the like is performed smoothly. The ball pressing body 24 is also provided with the through hole 2 for the same purpose.
4e are formed.

In the state shown in FIG. 2, the piston rod 11 is
By the action of the piston rod driving spring 12, a force for moving in the direction of the arrow in FIG.
6 is engaged with the concave portion 29b of the outer ring 29, and the movement of the piston rod 11 is prevented. That is, in FIG. 2, the valve is locked in a normal state. The ball 26 is the first step portion 2 of the ball pressing body 24.
The contact is made at the point A of 4c, and the ball 26 is pressed against the outer ring 29. This pressing force is due to the spring 25. The ball pressing body 24
Is provided with a second step portion 24d having an outer diameter smaller than that of the first step portion 24c. Although two balls 26 are provided in the circumferential direction in FIG.
Can be increased as needed.

[Description of Operation of Lock Mechanism] Next, the operation of the lock mechanism 4 will be described with reference to FIGS. The lock mechanism 4 operates only when the push rod 30 moves by the operation of the lock release mechanism 5 described later. First, as shown in FIG. 3, the end surface 24 b of the ball pressing body 24 is pressed by the movement of the push rod 30 in the direction of the arrow G, and the ball pressing body 2 is pressed against the urging force of the spring 25.
4 is also moved in the direction of arrow G. Thereby, the contact point A between the ball 26 and the first step portion 24c gradually moves, and finally reaches the point B. Then, the ball 26 is moved in the direction of arrow H in the figure by the reaction force of f2 and f3, which are the components of the force f1 acting on the ball. That is, the ball 26 is about to be moved from the first step portion 24c to the second step portion 24d, and the contact point is moved to the point C. As the ball 26 moves in the direction of the arrow H, the contact point between the ball 26 and the outer ring 29 moves from the point D to the point E, and the engagement state between the ball 26 and the outer ring 29 is released. Go. When the ball 26 gets over the point E, the piston rod 11 and the ball holder 19 can move in the direction of arrow J in FIG.

FIG. 4 shows a state in which the ball 26 has passed over the point E and is housed in the recess 27c of the ring body 27. or,
By the action of the spring 28, the ring body 27 is relatively moved rightward as compared with FIG. The ball 26 has a hole 19 b of the ball holding body 19 and a second
The state is accommodated in the space formed by the step portion 24d and the concave portion 27c of the ring body 27. The state shown in FIG. 5 is a state in which the piston rod 11 has moved to the leftmost side, and the distal end thereof has contacted the adjuster 16. With the movement of the piston rod 11, the trunnion 18 fixed to the piston rod 11 moves from the position shown by the dashed line in FIG. 1 to the position shown by the solid line, and the squatch yoke 17 is rotated clockwise accordingly. Then, the valve shifts from the normal state to the abnormal state.

Next, the operation when returning from the unlocked state to the locked state will be described. When the handle 10 of the manual pump 1 shown in FIG. 1 is operated, oil is fed to the left side of the ball holder 19 (see FIG. 5), and the ball holder 19 is pushed in the direction of arrow K in the figure. By this hydraulic pressure, the piston rod 11, the ball holding member 19, the ball pressing member 24, the ball 26, and the ring member 27 are integrally moved together with the urging force of the piston rod driving spring 12. . When returning from the state shown in FIG. 5 to the state shown in FIG.
The end 27b contacts the end 29a of the outer ring 29. From this state, the piston rod 11 and the like are further moved while the spring 28 is compressed. When the ball 26 returns to the state shown in FIG. 3, the ball 26 can move in the direction of the concave portion 29b of the outer ring 29. The ball 26 is a spring 2
5, the ball is pressed by the slope formed on the second step portion 24d of the ball pressing body 24, and is moved in the direction opposite to the arrow H in FIG. The ball pressing body 24 is returned to the initial state shown in FIG. At the initial position in FIG. 1, when the ball 26 is engaged with the concave portion 29 b of the outer ring 29, the locked state is established.

[Description of Configuration of Lock Release Mechanism] Next, the configuration of the lock release mechanism 5 will be described with reference to FIG. The push rod 30 described above is slidably attached to the cylinder body 31. The push rod 30
Tip 3 of locking mechanism 4 pressing ball pressing body 24
0a, a small diameter portion 30b guided by the guide body 32,
Large diameter portion 30c sliding on large diameter portion 31a of cylinder body 31
And a middle diameter portion 3 sliding on a small diameter portion 31b of the cylinder body 31
0d and the recess 3 into which the tip of the ball pressing shaft 33 is inserted.
0e and a hole 30f in which the ball 34 is stored. The guide body 32 is fixedly attached to the tip of the cylinder body 31 by a screw mechanism. Push rod 3
A bush 35 having a bearing function and a rubber packing 36 are provided in the through hole 32a for sliding the 0.

The cylinder body 31 is formed in a hollow, substantially cylindrical shape, and the large-diameter portion 31a and the small-diameter portion 31b formed on the inner surface thereof slidably support the push rod 30 and have a fitting recess. The outer ring 37 is attached to 31c. Further, a threaded portion 31d is provided at the end of the push rod 30, and the outer ring 37 is attached by screwing the pressing ring 38 to the threaded portion 31d. The outer ring 37 has a ball 3
4 is formed with a spherical concave portion 37a.
A plurality of steel balls 34 are provided along the circumferential direction, and two balls are shown in FIG. 6, but the set number can be appropriately selected. The ball pressing shaft 33 is
A small diameter portion 33a, a tapered portion 33b for pressing the ball 34 toward the concave portion 37a, a large diameter portion 33c, and a flange portion 3
3d and a concave portion 33e for accommodating the coil spring 39. Each of the balls 34 is pressed against the recess 37 a of the outer ring 37 by the urging force of the coil spring 39.

A push rod drive spring 40 is provided in a space defined by the large diameter portion 31a of the cylinder body 31 and the middle diameter portion 30d of the push rod 30. The drive spring 40 is configured as a disc spring. Push rod 40
Therefore, a considerable pressing force is required to operate the lock mechanism 4, but if this is constituted by a coil spring, the size becomes considerably large, and there is no space requirement. Therefore, the problem of space is solved by using a disc spring. In order to drive the cylinder body 31, a cylinder driving body 41 is connected by a screw portion 41a.
The cylinder driving body 41 includes an operating surface 41b on which the water pressure of the water pipe acts, an outer peripheral portion 41c sliding on the inner surface of the steel pipe 42,
Recess 41 in which one end of cylinder body drive spring 43 is held
d, and an end 41 e that comes into contact with the first fixed base 44. The cylinder body driving springs 43 are provided at four positions along the circumferential direction (two positions are shown in FIG. 6), and four concave portions 41d are also formed. Outer part 4
1c is provided with a Teflon ring 45 and a U-shaped rubber packing 46 whose surface is coated with Teflon. It is these Teflon portions that come into contact with the inner surface of the steel pipe 46.

Normally, 1 kg / cm ² is applied to the working surface 41b.
The above water pressure is acting, and this pressure and the four springs 43
It is designed to balance with the biasing force of.
The first fixing base 44 is formed in a disk shape, and is provided at four positions in the circumferential direction for penetrating the cylinder driving spring 43 and the contact surface 44a with which the end 41e of the cylinder driving body 41 contacts. Hole 44b and a breathing hole 44c are provided. A shaft 47 is fixedly attached to the center of the first fixed base 44. Further, a flange portion 33d of the ball pressing shaft 33 is inserted into a concave portion 44d provided at the center of the first fixing base 44, and a stopper ring 54 is attached.
3 in the protruding direction.

The shaft 47 has a spring receiving plate 4 formed with a concave portion 48a for receiving one end of the cylinder driving spring 43.
8 are provided. A screw portion 47a is provided at the tip of the shaft 47.
Is formed, and two nuts 49 are screwed into the nut, whereby the spring receiving plate 48 is attached. By changing the position of the nut 49, the mounting position of the spring receiving plate 48 can be changed, whereby the set hydraulic pressure at which the cylinder driver 41 starts driving can be adjusted.
Although the drive springs 43 are attached at four positions, the driving force can be adjusted by changing the number of attachments of the drive springs 43. A cover 53 for covering the periphery of the spring receiving plate 48 is attached to the first fixed base 44.

A second fixing base 50 for slidably supporting the cylinder body 31 is provided. Second fixed base 50
Are a sliding portion 50a for slidingly guiding the cylinder body 31, an oil port 50b for introducing oil to the working surface 30g of the push rod 30, and a water port for introducing water to the working surface 41b of the cylinder driving body 41. A water port 50c is provided. The second fixed base 50 has a contact surface 50d facing the working surface 41b of the cylinder driving body 41, and a gap of δ2 is provided between the two surfaces 41b and 50d. The sliding portion 50a is provided with a Teflon ring 51 and a U-shaped rubber packing 52 at three places. The first fixed base 44, the second fixed base 50, and the steel pipe 42 are fixed by an appropriate method.

[Description of Operation of Lock Release Mechanism] Next, the operation of the lock release mechanism 5 having the above configuration will be described with reference to FIGS. FIG. 6 shows a normal state. If the water pressure of the water pipe is 1 kg / cm ² or more, FIG.
Is maintained. Here, when an emergency such as an earthquake occurs and the water pipe ruptures, the water pressure decreases. Then, the water pressure acting on the operation surface 41b of the cylinder driving body 41 decreases, and the balance with the driving spring 43 is lost.
Thereby, the cylinder driving body 41 is moved in the direction of the arrow L in FIG. 7 by the urging force of the driving spring 43. The cylinder body 31, the push rod 30, the outer ring 37, the pressing ring 38, the ball 34, and the push rod driving spring 40 are also moved in the direction of the arrow L integrally with the cylinder driving body 41. In the state shown in FIG. 7, the cylinder driving body 41 has moved by the dimension .delta.2, and the gap between the working surface 41b and the contact surface 50d of the second fixed base 50 has disappeared. Instead, there is an interval of δ2 between the contact surface 44a of the first fixed base 44 and the end 41e of the cylinder driving body 41.

In the state shown in FIG. 7, the ball pressing shaft 33 is
9 urged in the direction of the arrow L, the flange 3
3d is in contact with the stopper ring 54, and has moved to a position where it cannot protrude any more. Push rod 3
By the movement of 0, the ball 34 has moved from a position facing the tapered portion 33b of the ball pressing shaft 33 to a position facing the small diameter portion 33a. Therefore, the ball 34 can move in the direction of arrow M in FIG. In FIG. 7, the push rod driving spring 40 has not driven the push rod 30 yet.

Immediately after the state shown in FIG.
The push rod 30 is further moved in the direction of the arrow L as shown in FIG. The ball 34 is sandwiched between the small diameter portion 31b and the small diameter portion 33a of the cylinder body 31. The distance that the push rod 30 further advances is the distance δ1 (see FIG. 6) until the working surface 30g of the push rod 30 contacts the guide body 32. FIG. 8 shows a state in which the movement of the push rod 30 has been completed, whereby the distal end portion 30a pushes the ball pressing body 24 of the lock mechanism 4, and the lock mechanism 4 locks as shown in FIG. Is released. Hereinafter, as described in the operation of the lock mechanism 4, the valve is shifted from the open state to the closed state.

Next, the operation for returning the lock release mechanism 5 to the initial position shown in FIG. 6 will be described. First, when the water pressure returns to a normal pressure of 1 kg / cm ² or more by repairing the water pipe, the water pressure acts on the working surface 41 b of the cylinder driving body 41 via the water port 50 c, and the urging force of the cylinder body driving spring 43. 9, the cylinder body 31, the cylinder driving body 41, and the push rod 30 are integrally moved in the direction of arrow N in FIG. Then, the end 41 e of the cylinder driving body 41 is moved to a position where it comes into contact with the contact surface 44 a of the first fixed base 44. In FIG. 9, the ball 34
Has moved to the boundary between the small diameter portion 33a of the ball pressing shaft 33 and the tapered portion 33b. However, the ball pressing shaft 33 is still in a state where the flange portion 33 d is in contact with the stopper ring 54.

Next, when the manual pump 1 is operated, the hydraulic pressure is applied to the working surface 3 of the push rod 30 through the oil port 50b of the second fixed base 50 and the through hole 31e of the cylinder body 31.
0g is pressed in the direction of arrow P in FIG. Then, the push rod 40 is moved in the direction of arrow N in FIG. 10 against the urging force of the push rod drive spring 40. With the movement of the push rod 40, the ball 34 is also moved, and the ball 34 is moved to the small diameter portion 33a of the ball pressing shaft 33.
And the taper portion 33b pushes the stepped portion, so that the ball pressing shaft 33 also opposes the urging force of the coil spring 39 and the arrow N
In the direction of. Then, as shown in FIG. 10, the ball 34 is
When the ball 34 reaches the position facing the
It is possible to move in the direction. Specifically, the ball pressing shaft 33
The ball 34 is pushed by the tapered portion 33b, and moves in the Q direction in the figure, engages with the concave portion 37a of the outer ring 37, and returns to the initial state shown in FIG. In the state shown in FIG. 6, the movement of the push rod 30 in the protruding direction is locked by the engagement between the ball 34 and the concave portion 37a.

[Another Embodiment] The present invention can be applied not only to a water pipe but also to a gas pipe. Although the lock release mechanism mechanically detects a decrease in water pressure, it may be configured to electrically detect the decrease.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an entire emergency shut-off valve driving device.

FIG. 2 is a cross-sectional view illustrating a configuration of a lock mechanism.

FIG. 3 is a view for explaining the operation of a lock mechanism (part 1).

FIG. 4 illustrates the operation of the lock mechanism (part 2).

FIG. 5 illustrates the operation of the lock mechanism (part 3).

FIG. 6 is a sectional view showing the configuration of a lock release mechanism.

FIG. 7 illustrates the operation of the lock release mechanism (part 1).

FIG. 8 illustrates the operation of the lock release mechanism (part 2).

FIG. 9 illustrates the operation of the lock release mechanism (part 3).

FIG. 10 illustrates the operation of the lock release mechanism (part 4).

FIG. 11 is a diagram illustrating an arrangement of an emergency shutoff valve and a flow of water according to the related art.

FIG. 12 is a side view of a lock system according to the related art.

FIG. 13 is a front view of a lock system according to the related art.

FIG. 14 is a view of the emergency shutoff valve as viewed from a direction along the rotation axis thereof.

FIG. 15 is a view of the emergency shut-off valve as viewed from the direction of its rotation axis.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manual pump 2 Piston rod drive spring accommodation part 3 Motion conversion part 4 Lock mechanism part (lock device) 5 Unlock mechanism part (lock release device) 11 Piston rod (first drive shaft member) 19 Ball support (first ball) Support member) 21 cylinder body 24 ball pressing body (second ball pressing member) 24c first step portion 24d second step portion 26 ball (first ball member) 29 outer ring (first ball movement prevention member) 30 push rod ( Second drive shaft member 31 Cylinder body (cylindrical member) 33 Ball pressing shaft (second ball pressing member) 34 Ball (second ball member) 37 Outer ring (second ball movement preventing member) 40 Push rod drive spring ( (First urging means) 41 cylinder driving body (fluid pressure detecting member) 43 cylinder body driving spring (second urging means) 84 Valve cylinder

Claims (4)

[Claims] An emergency shut-off valve movable between a first position in which a fluid passage state in a fluid pipe is in a predetermined state and a second position in which the state is different from the predetermined state. In a drive device for an emergency shutoff valve having a lock mechanism for locking at a position, the lock mechanism drives the emergency shutoff valve from the first position to the second position, and a first drive shaft member, A first ball member movable integrally with the first drive shaft member, and a first movement preventing member that locks the emergency shut-off valve at the first position by preventing movement of the first ball member. Driving the emergency shut-off valve from the first position to the second position by releasing the blocking state of the first ball member by the first movement preventing member. apparatus. 2. A ball holding member integrally held by the first drive shaft member holds the ball holding member.
The first ball member is attached to the first drive shaft member.
A first ball pressing member that presses against the movement inhibiting member, the first ball pressing member includes a first portion that presses the first ball member against the first movement preventing member;
The said 1st ball member is provided with the 2nd part which can escape from the said 1st movement prevention member, The 1st part.
A drive device for an emergency shut-off valve according to claim 1. 3. A second drive shaft member for releasing a blocking state of the first ball member by the first movement blocking member, and a second ball member movable integrally with the second drive shaft member. A second movement preventing member that locks the second drive shaft member by preventing the movement of the second ball member, and prevents the second ball member from being blocked by the second movement preventing member. A driving device for an emergency shut-off valve, wherein the second driving shaft member is driven by releasing the first ball member, thereby releasing the blocking state of the first ball member by the first movement preventing member. 4. The second drive shaft member holds the second ball member, and the second ball member holds the second ball member in the second drive shaft member.
A second ball pressing member that presses against the movement preventing member; a second portion that presses the second ball member against the second movement preventing member;
The said 2nd ball member is equipped with the 2nd part which can escape from the said 2nd movement prevention member, The 1st part.
The drive device for an emergency shutoff valve according to any one of claims 1 to 3.