JP2001050410A - Emergency cutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of operation failure while avoiding the submergence of a flow velocity detecting mechanism, an engaging and disengaging mechanism, a turning mechanism, a torque generating source and a link mechanism even if an underground embedded valve chamber is sunken in the water. SOLUTION: In this cutoff valve, a valve rod 3 having a vertical axis Cy is extended to an upstairs chamber of an underground embedded valve chamber, and connected to a torque generating source 40 and a link mechanism 50 through an orthogonal transformation converting motive power transmitting mechanism 80. A flow speed detecting mechanism 10 is divided into a lower side flow speed detecting part 10a provided on the valve casing 1 side and an upper operating part 10B provided in the upstairs chamber, and both the parts 10A, 10B are connected to each other freely to be interlocked with each other through a pair of connecting rods 90, 90 having the vertical axis Cy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shutoff valve for urgently shutting off a water pipe when an earthquake occurs, for example.

[0002]

2. Description of the Related Art Conventionally, a self-powered emergency shut-off valve shown in FIG. 3 has a function of shutting off water flow by itself when an abnormal situation occurs in which a water distribution pipe is damaged by an earthquake. . In this figure, reference numeral 1 denotes a valve box, 2 denotes a valve body, and 3 denotes a valve rod.
A and 4B are connected, and when the valve body 2 is opened as shown in the figure, as shown by an arrow F, the water pipe 4A is connected to the water pipe 4B.
Water passes in the direction of. On the other hand, the valve body 2 fixed to the valve rod 3 rotates together with the valve rod 3 by about 90 degrees around its axis, whereby a closed state of the flow path can be obtained. This type of emergency shutoff valve includes a flow velocity detection mechanism 10, an engagement / disengagement mechanism 20, a rotation mechanism 30, a torque generation source 40, and a link mechanism 50.

[0003] The flow velocity detecting mechanism 10 is configured to detect the flow velocity of the passing water flow F and operate when the flow velocity reaches a set value. That is, as shown in FIGS. 3 to 6, a flow sensor 11 protruding into the valve box 1, a sensor horizontally and rotatably supported in a hood 12 mounted on the valve box 1 in a watertight manner. Sensor lever 1 fixed to the end of sensor shaft 13 outside shaft 13 and hood 12
4. A balance weight 15 fixed to one end of a fulcrum portion 14A of the sensor lever 14, and a sensor weight 16 positioned on the opposite side of the balance weight 15 of the sensor lever 14 and slidably mounted in the direction of the arrow and positioned. The upper end of the flow sensor 11 is fixed to the sensor shaft 13.

[0006] As shown in FIGS. 3 to 6, the engagement / disengagement mechanism 20 includes a vertical rod-shaped rod 21 and a rod 2.
1 is provided with a bell-crank-shaped latch lever 22 which is connected to and linked to the lower end of the first lever 1. The upper end of the rod 21 is swingably connected to the opposite side of the balance weight 15 in the sensor lever 14 via the pin 23, and the lower end is connected to the tip of the one-side extension 22A of the latch lever 22. I have. The latch lever 22 is rotatably supported by the pin 22B, and is provided with an engaging claw 22d at the distal end of the other side extension 22D.

The rotation mechanism 30 is shown in FIGS. 3, 4, 7, and 8.
As shown in FIG. 9, the latch 31, the weight 32,
A striker 33 is provided. The latch 31 is fixed to one end of a shaft 34, and the shaft 34 is horizontally and rotatably supported by bearings 6, 6 provided on an upper portion of the cylinder base 5. Thereby, when the latch 31 rotates together with the shaft 34, the tip claw portion 31A has an
The latch lever 22 is detachably engaged with the engaging claw 22d. The weight 32 is fixed to the other end of the shaft 34 via a lever 35 extending obliquely upward. The striker 33 includes a pair of left and right arm portions 33A, 33A extending diagonally downward and facing each other, and a horizontal striking pin 33B bridging and connecting the lower ends of the arm portions 33A, 33A. Formed in a U-shape with
The upper ends of the rubber parts 33A, 33A
4 is fixed.

[0006] As shown in FIG.
It is constituted by a weight 42 attached to one end of the valve stem 3 via an arm 41. The link mechanism 50 is
As shown in FIGS. 3, 7, 9, and 10, a first link 51, a second link 52, and a lever 53 are provided. The distal end of the first link 51 is rotatably supported by a fixing member 55 via a horizontal pin 54, and the rear end is articulated to the distal end of the second link 52 via a horizontal pin 56. The rear end of the second link 52 is rotatably connected to the upper end of the lever 53 via a horizontal pin 57. Further, a positioning member 58 made of a bolt and a nut is attached through the first link 51 in a vertical direction, and a lower end of the positioning member 58 is provided with a stopper.
By abutting on 58A, the operation of link mechanism 50 in the lower side (one side) of idea point C is restricted within the limit.
The lever 53 is fixed to the other end of the valve stem 3,
The distal end of the piston rod 7A of the hydraulic cylinder 7 is connected to the lower end via a horizontal pin 59. Further, a projection 53A is protruded from the lower end of the lever 53, and an opening pointer 53B is provided behind the projection 53A. The hydraulic cylinder 7 is connected to a cylinder base 5 through a horizontal trunnion 8 as shown in FIG.
The cylinder base 5 is swingably supported by a trunnion cover 5A which removably closes one opening of the cylinder base 5. In FIG. 4, reference numeral 17 denotes an upper stopper, 1
Reference numeral 8 denotes a lower stopper, each of which is a sensor lever-14.
Are provided corresponding to the vicinity of the balance weight 15. In FIG. 7, 9A and 9B indicate limit switches, 9C indicates an opening scale plate, and 9D indicates a stopper.
When the lever 53 rotates together with the valve stem 3, the limit switches 9A and 9B are used to move the elephant rotation locus R of the projection 53A.
The opening scale plate 9C is provided correspondingly to the upper side.
B is provided.

In the emergency shut-off valve configured as described above, in the region where the flow velocity of the passing water flow F shown in FIG. 4 is less than the set value, the weight ratio and the lever ratio of the balance weight 15 and the sensor weight 16 of the flow velocity detecting mechanism 10 are shown. As a result, the sensor lever 14 is held in the downward-rightward position shown by the solid line in contact with the upper stopper 17, and the flow sensor 11 is at the position shown by the solid line. Therefore, the latch lever 22 of the engagement / disengagement mechanism 20 is also held at the first position shown by the solid line, and the engagement claw 22d is the claw 31 of the latch 31 of the rotation mechanism 30.
A, and holds the valve body 2 of FIG. 3 in the valve open state in a substantially horizontal posture.

When the downstream pipe 4B of the emergency shutoff valve is damaged due to the occurrence of an earthquake or the like and the flow rate of the passing water flow F shown in FIG. 4 exceeds a set value, the flow sensor 11 rotates to the position indicated by the phantom line. However, the sensor lever 14 is held in an upwardly right position in contact with the lower stopper 18 as indicated by a virtual line. As a result, the rod 21 of the engagement / disengagement mechanism 20 is pulled up, and the latch lever 22 is rotated clockwise to the second position indicated by the imaginary line, and the engagement claw 22d is moved to the claw portion 31A of the latch 31 in the rotation mechanism 30. Evacuate from. When the engagement between the engaging claw 22d of the latch lever 22 and the claw portion 31A of the latch 31 is released, the lever is moved by the weight of the weight 32 of the rotating mechanism 30 held at the position shown by the solid line in FIG. The −35 and the shaft 34 (see FIG. 8) rotate to the position indicated by the imaginary line, and the striker 33 also rotates from the position indicated by the dashed line to the position indicated by the imaginary line.

[0009] By rotating the striker 33, FIG.
A striking pin 33B shown in FIG. 5 collides with the lower surface of the joint portion between the rear end of the first link 51 and the front end of the second link 52 in the link mechanism 50 and pushes upward to bend the link mechanism 50, thereby causing the pin 56 to be bent. Moves to the upper side (the other side) beyond the thought point C1 of the link mechanism 50. At that moment, the lever 41 and the valve rod 3 are rotated in the direction of arrow B by the own weight torque of the weight 42 in the torque generating source 40 in FIG. 3, and the valve body 2 is rotated in the valve closing direction. When the valve element 2 starts to rotate in the valve closing direction, the dynamic pressure of the passing water flow F is increased.
To generate hydraulic torque in the valve closing direction. on the other hand,
In the state before the lever 53 is rotated by the weight of the weight 42 due to its own weight torque, that is, in the position shown by the solid line in FIG. 7 and when the projection 53A is in contact with the limit switch 9A, the front chamber of the hydraulic cylinder 7 is Is returned to an oil tank (not shown) through a return passage (not shown). Therefore, by the rotation of the lever 53, the piston rod 7A of the hydraulic cylinder 7 moves forward,
The hydraulic cylinder 7 tilts upward (upward) in FIG. 7 around the trunnion shaft 8 in FIG. By the operation of the hydraulic cylinder 7, the self-weight torque of the weight 42 and the valve closing speed of the valve body 2 in FIG. 3 by the hydraulic torque caused by the dynamic pressure of the passing water flow F are adjusted to prevent the occurrence of the water hammer phenomenon. While preventing this, the valve body 2 is closed in a substantially vertical posture to shut off the flow of water from the upstream water distribution pipe 4A to the downstream water distribution pipe 4B. This valve closed state is maintained by the lever 53 rotating together with the valve stem 3 from the position shown by the solid line in FIG. 9 to the position shown by the imaginary line abutting on the stopper 9D and stopping. When the lever 53 pivots to the position indicated by the imaginary line in contact with the stopper 9D and stops, the projection 53A contacts the limit switch 9B, and the high-pressure oil in the rear chamber of the hydraulic cylinder 7 returns to the return passage. (Not shown)
Through the oil tank (not shown).

As described above, the conventional emergency shutoff valve can shut off water flow by itself in an emergency when the water distribution pipe 4B is damaged by an earthquake. On the other hand, as shown in FIG. 11, the emergency shutoff valve is installed in a concrete-buried underground type valve chamber 70.

[0011]

However, in the conventional emergency shut-off valve, the flow velocity detecting mechanism 10, the disengaging mechanism 20, the rotating mechanism 30, the torque generating source 40, the link mechanism 50, and the like are all located near the valve box 1. If the underground type valve chamber 70 is submerged in the water, the flow velocity detecting mechanism 10, the engagement / disengagement mechanism 20, the rotation mechanism 30, the torque generation source 40, the link mechanism 50, and the like are submerged and malfunction. May occur.

Accordingly, the present invention provides a method for controlling the flow velocity detecting mechanism 10, the engaging / disengaging mechanism 20, the rotating mechanism 30, the torque generating source 40, the link mechanism 50 and the like even if the buried valve chamber 70 is submerged. It is an object of the present invention to provide an emergency shut-off valve capable of avoiding submersion and preventing malfunction from occurring.

[0013]

In order to achieve the above object, an emergency shut-off valve according to the present invention comprises a cylindrical valve box 1 having both ends opened in the direction of the horizontal axis Cx, and the valve box 1 having the horizontal A valve stem 3 having a longitudinal axis Cy crossing the axis Cx and rotatably supported around the longitudinal axis Cy; and a valve stem 3 fixed to the valve stem 3 and inside the valve box 1 together with the valve stem 3 A valve body 2 which is opened and closed by rotating around its axis to allow or shut off water flow in the valve box 1, and the valve body 3 is fixedly attached to a valve rod 3 outlet outside the valve box via the valve rod 3. 2, a torque generating source 40 that constantly biases its own weight torque in the valve closing direction, and a state in which the valve rod 3 is prevented from rotating in the valve closing direction by the own weight torque of the torque generating source 40 in normal times. A link mechanism 50 connected to the valve stem 3 and a joint 56 of the link mechanism 50 when an abnormal situation occurs. Interference causes the link mechanism 50 to bend and release the state in which the valve stem 3 is prevented from rotating in the valve closing direction, thereby allowing the torque generating source 40 to rotate the valve stem 3 in the valve closing direction due to its own weight torque. In the normal state, the output end 22 is detachably engaged with the input end 31 of the rotation mechanism 30 to prevent the rotation mechanism 30 from interfering with the joint 56 of the link mechanism 50. An output unit 14 is connected to an input / output 23 of the engagement / disengagement mechanism 20 and an input / output unit 23 of the engagement / disengagement mechanism 20. A flow rate detector that detects a flow rate and operates when an abnormal situation occurs in which the flow rate reaches a set value to disengage the output end 22 of the disengagement mechanism 20 from the input end 31 of the rotating mechanism 30. In the emergency shut-off valve provided with the mechanism 10, the valve stem 2 has a vertical axis Cy. It extends above the valve casing 1 by, the extended end portion orthogonal transform power transmission mechanism 8
0 and the link mechanism 50
And the flow rate detecting mechanism 10 is divided into a lower flow rate detecting section 10A provided on the valve box 1 side and an upper operating section 10B provided at a distance above the valve box 1. The lower flow rate detecting unit 10A and the upper operating unit 10B are operatively connected to each other via a connecting rod 90 having a longitudinal axis Cy, and the output unit 14 of the upper operating unit 10B is connected to the input end of the disengaging mechanism 20. 23 is connected.

According to the present invention, the upper operating portion 10B of the flow velocity detecting mechanism 10, the engaging / disengaging mechanism 20, the rotating mechanism 30, the torque generating source 40, the link mechanism 50 and the like are buried in the underground type valve chamber 7.
0 can be installed in the upper floor room 72. Therefore, even if the underground valve chamber 70 is submerged, the submergence of the flow velocity detection mechanism 10, the engagement / disengagement mechanism 20, the rotation mechanism 30, the torque generation source 40, the link mechanism 50, and the like is avoided. It is possible to prevent malfunction from occurring.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing the entire configuration of a self-powered emergency shutoff valve according to the present invention, and FIG. 2 is a schematic side view of the entire configuration. The feature of the present invention resides in that the upper operating portion 10B of the flow velocity detecting mechanism 10, the engagement / disengagement mechanism 20, the rotation mechanism 30, the torque generation source 40, the link mechanism 50, and the like are installed at positions away from the valve box 1 upward. Since the other structure is the same as the conventional self-powered emergency shutoff valve, the same reference numerals are given to the same or corresponding parts as in the conventional example, and only the characteristic parts of the present invention will be described. 1 and 2, the valve stem 3 has a vertical axis Cy and has a valve box 1.
And extends through the ceiling 71 of the valve room 70 to the inside of the upper floor room 72, and is rotatably supported by the upright wall of the valve room 70 via the bracket 100.

The upper end of the valve stem 3, that is, the extended end, is connected to the torque generating source 40 and the link mechanism 50 via the orthogonal conversion power transmission mechanism 80. Orthogonal conversion power transmission mechanism 80
Is a bevel gear type provided with three bevel gears 81, 82, 83 which mesh with each other and rotate simultaneously. The bevel gear 81 is fixed to the upper end of the valve stem 3, and the bevel gear 82 is a torque generating source. The bevel gear 83 is fixed to the inner end of the horizontal shaft 60 to which the lever 53 of the link mechanism 50 is mounted, while being fixed to the inner end of the horizontal shaft 43 of the fork shaft 40.
Reference numeral 44 denotes a clutch, and 45 denotes an operation handle. The clutch 44 is normally kept in the OFF state. The clutch 44 is switched to the ON state when the valve body 2 that has been closed when an abnormal situation occurs is returned to the valve open state. Thus, by rotating the operation handle 45 in the valve opening direction, the valve body 2 can be returned to the valve open state.

On the other hand, the flow velocity detecting mechanism 10 is divided into a lower flow velocity detecting section 10A and an upper operating section 10B.
It is connected to each other via a pair of connecting rods 90 and 90 having a vertical axis Cy so as to be interlocked with each other.
0B, that is, the sensor lever 14 is
, Ie, the pin 23. The lower flow velocity detecting unit 10A includes a flow sensor 11, a hood 12,
A first sensor shaft 13 and a lever 13A attached to an outer end of the first sensor shaft 13;
Has a second sensor shaft 13B, a sensor lever 14, a balance weight 15, and a sensor weight 16. Second
The sensor shaft 13B is rotatably supported by a bearing member 13C, and has a lever 13D attached thereto. Both ends of the lever 13D and both ends of the lever 13A are interlocked via a pair of connecting rods 90,90. Linked to each other as possible.

In the above configuration, in the region where the flow velocity of the passing water flow F in FIGS. 1 and 2 is less than the set value, the balance weight 15 and the sensor weight 16 of the flow velocity detection mechanism 10 are set.
The sensor lever 14 is held in a substantially horizontal posture, and the flow sensor 11 is at a normal position. Therefore, the latch lever in the engagement / disengagement mechanism 20
The engaging claw 22d of the latch 22
And holds the valve body 2 in the valve open state in a substantially horizontal posture.

When the downstream pipe 4B of the emergency shutoff valve is damaged due to the occurrence of an earthquake or the like and the flow rate of the passing water flow F exceeds a set value, the flow sensor 11 rotates counterclockwise in FIG. -13A rotates upward and to the right. Lever-13A
Is transmitted to the lever 13D via the pair of connecting rods 90.90, and the lever 13D is rotated upward and the sensor lever 14 is held in the upwardly inclined posture. As a result, the rod 21 of the engagement / disengagement mechanism 20 is pulled up, and the latch lever 22 is rotated clockwise, and the engagement claw 22d is latched by the latch 3 of the rotation mechanism 30.
The first claw 31A is retracted. When the engagement between the engaging claw 22d of the latch lever 22 and the claw 31A of the latch 31 is released, the rotating mechanism 30 held at the position indicated by the solid line
The weight of the weight 32 makes the lever 35 and the shaft 34
Rotates counterclockwise to rotate the striker 33 counterclockwise.

When the striker 33 rotates counterclockwise, the striking pin 33B is connected to the rear end of the first link 51 and the second link 52 of the link mechanism 50.
The link mechanism 50 is bent by colliding with the lower surface of the joint portion with the tip of the link mechanism and pushing up the link mechanism 50 so that the pin 56
It moves upward beyond the zero thought point. At that moment, the lever 41 is rotated clockwise by the weight of the weight 42 of the torque generation source 40, and the valve stem 3 and the valve body 2 are rotated in the valve closing direction. When the valve element 2 starts to rotate in the valve closing direction, the dynamic pressure of the passing water flow F is applied to the valve element 2 to generate hydraulic torque in the valve closing direction. On the other hand, lever 53
Is in a state prior to being rotated by the weight of the weight 42, that is, in the position shown by the solid line in FIG.
Is in contact with the limit switch 9A, the high-pressure oil in the front chamber of the hydraulic cylinder 7 is returned to an oil tank (not shown) through a return passage (not shown). Therefore, by the rotation of the lever 53, the piston rod 7A of the hydraulic cylinder 7 advances, and the hydraulic cylinder 7 tilts upward (forward) in FIG. 8 around the trunnion shaft 8 in FIG. I do. By the operation of the hydraulic cylinder 7, the self-weight torque of the weight 42 and the valve closing speed of the valve body 2 by the hydraulic torque generated by the dynamic pressure of the passing water flow F are adjusted to prevent the occurrence of the water hammer phenomenon. Then, the valve body 2 is closed in a substantially vertical posture to shut off the flow of water from the upstream water distribution pipe 4A to the downstream water distribution pipe 4B. That is, the emergency shut-off valve according to the present invention is similar to the conventional emergency shut-off valve, and when an abnormal situation occurs, the upstream water distribution pipe 4A
From the water distribution pipe 4B on the downstream side can be reliably shut off.

On the other hand, the upper operating part 10 of the flow velocity detecting mechanism 10
B, the engagement / disengagement mechanism 20, the rotation mechanism 30, the torque generation source 40, the link mechanism 50, and the like can be installed in the upper floor room 72 of the underground type valve room 70. For this reason, even if the underground valve chamber 70 is submerged, the flow velocity detection mechanism 10,
Submersion of the engagement / disengagement mechanism 20, the rotation mechanism 30, the torque generation source 40, the link mechanism 50, and the like can be avoided, and malfunctions can be reliably prevented from occurring.

In the above embodiment, a pair of connecting rods 90,
Although the description has been given of the configuration in which the lever 13A and the lever 13D are linked to each other by 90, the configuration may be such that the lever 13A and the lever 13D are linked to each other by only one connecting rod 90.

[0023]

As described above, according to the present invention, the upper operating portion of the flow velocity detecting mechanism, the disengaging mechanism, the rotating mechanism, the torque generating source, the link mechanism, and the like are provided in the upper floor chamber of the underground type valve chamber. Can be installed. For this reason, even if the underground valve chamber is submerged, the submersion of the flow velocity detection mechanism, the engagement / disengagement mechanism, the rotation mechanism, the torque generation source, the link mechanism, and the like is avoided, and malfunctions are prevented from occurring. It can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing the entire configuration of a self-powered emergency shutoff valve according to the present invention.

FIG. 2 is a schematic side view showing the entire configuration of the suction means of the self-powered emergency shutoff valve according to the present invention.

FIG. 3 is a perspective view of a conventional self-powered emergency shutoff valve.

FIG. 4 is an enlarged longitudinal side view showing a relationship between a flow velocity detection mechanism, an engagement / disengagement mechanism, and a rotation mechanism.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is an enlarged side view showing the relationship between the rotation mechanism and the link mechanism.

FIG. 8 is a sectional view taken along line CC of FIG. 7;

FIG. 9 is a longitudinal sectional side view showing the link mechanism in an enlarged manner.

FIG. 10 is a sectional view taken along line DD in FIG. 9;

FIG. 11 is a cross-sectional view showing a conventional installation state in a valve chamber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve body 3 Valve stem 10 Flow rate detecting mechanism 10A Lower flow rate detecting section 10B Upper operating section 20 Disengagement mechanism 22 Latch lever (output end of disengagement mechanism) 23 Pin (input end of disengagement mechanism) Reference Signs List 30 rotation mechanism 31 latch (input end of rotation mechanism) 40 torque generating source 50 link mechanism 80 orthogonal transformation power transmission mechanism 90 connecting rod 56 horizontal pin (joint of link mechanism) Cx horizontal axis Cy Cy vertical axis

Claims (1)

[Claims] 1. A cylindrical valve box having both ends opened in the horizontal axis direction, and a valve having a vertical axis intersecting the horizontal axis and rotatably supported around the vertical axis. A rod, a valve element fixed to the valve rod, rotated around the axis thereof together with the valve rod inside the valve box, and opened and closed to allow or block water flow in the valve box; and a valve of the valve rod. A torque source fixedly attached to the out-of-box outlet portion and constantly biasing the valve body to the valve body via its own weight torque via the valve stem; and in normal times, the valve of the valve stem by its own weight torque of the torque source. A link mechanism that is held in a state of preventing rotation in the closing direction and is connected to the valve stem;
When an abnormal situation occurs, the link mechanism is bent by interfering with the joint portion of the link mechanism to release the rotation blocking state of the valve stem in the valve closing direction, and the valve closing direction of the valve stem due to the own weight torque of the torque generating source. A rotation mechanism that allows rotation of the rotation mechanism, and an output end that is normally disengageably engaged with an input end of the rotation mechanism and interferes with a joint of the link mechanism. An output unit connected to an input end of the engagement / disengagement mechanism, and a detection end detecting a flow velocity of a passing water flow inside the valve box when the valve element is opened, and detecting the flow velocity. Actuated when an abnormal situation occurs when the set value has been reached, and a flow rate detection mechanism for releasing the engagement between the output end of the disengaging mechanism and the input end of the rotating mechanism. The valve stem extends above the valve box with a longitudinal axis, and this extended end is orthogonally transformed. A lower flow velocity detecting unit, which is connected to the torque generating source and the link mechanism via a force transmission mechanism and is installed on the valve box side, and is separated from the valve box above the valve box. The upper flow rate detector and the upper flow rate detector are connected to each other via a connecting rod having a vertical axis so as to be interlocked with each other. An emergency shutoff valve connected to an end.