JP2010159796A - Emergency shutoff valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate a series of operations of shifting a valve element from a valve open state to a half-open state and stopping it and then shifting to a valve close state, and to simplify a structure of a device. <P>SOLUTION: In the emergency shutoff valve, the valve element 2 is attached to a valve shaft 5 supported by a valve box 3, and a valve hole is freely opened and closed, and an arm 7 and a weight 6 turn together with the valve shaft 5, and the arm 7 is locked by a locking lever 8 capable of swinging in the vertical direction to maintain the valve element 2 in the valve open state. A sub arm 17 rotating together with rotation of the valve shaft 5 and a locking means 18 locked in the sub arm 17 to prevent lowering of the weight 6 are provided, and after locking of the arm 7 by the locking lever 8 is released, the locking means 18 is locked in the sub arm 17 in order to maintain the valve element 2 in the half-open state before the valve element 2 is rotated to the valve close direction and reaches the valve close state, and when locking of the sub arm 17 by the locking means 18 is released, the valve element 2 is shifted to the valve close state by lowering of the weight 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an emergency shut-off valve that is installed in piping of waterworks, hydroelectric power stations, etc. and automatically or manually shuts off the pipeline in an emergency such as a large earthquake.

  For example, as shown in FIG. 6, the conventional emergency shut-off valve 1 has a valve shaft 5 inserted into a valve box 3, and a valve body 2 is integrally provided on the valve shaft 5 so as to be rotatable around the shaft. A butterfly valve type is common.

  An arm 7 that rotates around the valve shaft 5 together with the valve shaft 5 is attached to one end of the valve shaft 5, and a weight 6 is provided at the tip of the arm 7. A long locking lever 8 is provided on the frame 4 fixed to the valve box 3.

  The locking lever 8 is supported by a support pin 12 in the middle in the length direction, and can swing up and down around the support pin 12. Further, a recess 8 a into which a pin 7 a provided on the arm 7 is fitted is formed on the lower surface of one end of the locking lever 8.

  As shown in FIG. 6, the emergency shut-off valve 1 is configured such that the arm 7 is in an upward state, and the concave portion 8 a of the locking lever 8 is locked to the pin 7 a of the arm 7. By stopping, the lowering of the weight 6 is prevented and the valve open state is maintained.

  An orifice 10 is provided in a pipe line upstream of the valve box 3, and a rod of a differential pressure cylinder (operating means 20) that is movable by a pressure difference across the orifice 10 is connected to the other end of the locking lever 8. 8b.

  When the differential pressure across the orifice 10 increases due to the increase in the flow rate of the pipe line, and the differential pressure exceeds a predetermined value, the differential pressure cylinder operates to swing the locking lever 8 to lock the arm 7. To release. When the locking is released, the arm 7 is rotated by the weight of the weight 6, and the valve shaft 5 is rotated to close the valve p, thereby blocking the flow of the pipe line p.

  At this time, the damper 9 is attached to the attachment member of the frame 4 via a pin, and the tip of the rod of the damper 9 is connected to the attachment member of the arm 7 via the pin. For this reason, the weight 6 falls gently and the valve body 2 closes gently (for example, refer patent document 1).

  In addition, there is a configuration in which the swing of the locking lever 8 is controlled based on a signal from a seismometer, instead of the swing control of the locking lever 8 by the orifice 10 and the differential pressure cylinder.

For example, instead of the differential pressure cylinder, an air cylinder is arranged as the operating means 20, and the rod of the air cylinder is pin-connected to the other end 8 b of the locking lever 8. When the seismometer detects a shake greater than or equal to a predetermined value, a signal is transmitted, and the air cylinder rod moves forward and backward in response to the signal.
The locking lever 8 is swung by the movement of the rod, and the locking of the arm 7 is released. When the locking is released, the arm 7 is rotated by the weight of the weight 6, and the valve shaft 5 is rotated and closed to shut off the flow of the pipe line p (see, for example, Patent Document 2).

JP 2006-97706 A JP 2002-71039 A

  In this type of emergency shut-off valve, when shutting off the valve in an emergency, the valve body is not suddenly shifted from the fully open state to the fully closed state, but between the open and closed states (hereinafter referred to as “half-open state”). There is a request to pause. This is for avoiding the downstream side of the pipe from being completely water-stopped due to a so-called malfunction.

  For example, in the case of an emergency shut-off valve using the orifice and the differential pressure cylinder, this malfunction is a temporary, instantaneous change in the pressure acting on the differential pressure cylinder that does not require an emergency shut-off of the emergency shut-off valve. It is assumed that the pipe line is accidentally closed completely. Further, for example, in the case of an emergency shut-off valve that operates with a signal from a seismometer, a situation may be assumed in which the pipeline is accidentally fully closed when the signal from the seismometer is a false alarm.

In conventional emergency shut-off valves, in order to stop the valve body once in the “half-open state”, the clutch of the opening / closing device provided alongside the valve box is in the “intermediate position” corresponding to the “half-open state” of the valve body. Waiting in advance. Thereby, the rotation of the valve shaft due to the fall of the weight is temporarily stopped at the “intermediate position”. In this state, the valve body is maintained in the “half open state”.
Thereafter, the operator confirms that the transition to the “half-open state” of the valve body is not a malfunction. After the confirmation, the operator operates the clutch 13 to perform necessary operations such as separating the movement of the arm and the movement of the valve shaft, and operates the manual handle 15 of the manual opening / closing device 14 or the electric opening / closing device 16. The valve shaft 5 is rotated by driving an electric motor or the like, so that the valve body 2 is shifted to a closed state.

Various operations related to such clutches, manual handles, electric motors, and the like are performed by separate devices, which is a very troublesome operation. Further, the above manual operation is particularly heavy labor. For this reason, it is desirable that a series of operations can be easily performed.
Further, when an electric motor is employed, the rotation of the valve shaft by the electric motor requires a large torque, so that the required battery capacity also increases. For this reason, since it leads to the complication and enlargement of an apparatus, it may be unpreferable.

  Therefore, the present invention facilitates a series of operations for shifting the valve body of the emergency shut-off valve from the valve open state to the half-open state and once stopping at that position, and then shifting the valve body to the valve closed state, It is an object to simplify the configuration of the apparatus.

  In order to solve the above-mentioned problems, the present invention attaches a valve body to a valve shaft that is rotatably supported around a shaft on a valve box, and the valve body rotates around the shaft together with the valve shaft to thereby provide a valve in the valve box. The hole is openable and closable, and has an arm that rotates with the rotation of the valve shaft. The arm is provided with a weight, and the fixed frame is provided with a locking lever that can swing in the vertical direction. When the stop lever is locked to the arm, the weight is prevented from lowering and the valve body is maintained in the valve open state. When the locking of the arm by the locking lever is released, the weight is lowered. In the emergency shut-off valve configured to rotate the valve body in the valve closing direction by rotating the arm, the weight is obtained by engaging the sub arm that rotates with the rotation of the valve shaft and the sub arm. A locking means for preventing the lowering, and after the locking of the arm by the locking lever is released, before the valve body rotates in the valve closing direction to reach the valve closing state, the locking means By locking to the sub arm, the valve body is maintained at a position between the valve closed state and the valve open state, and when the locking of the sub arm by the locking means is released, the weight is lowered. A configuration is adopted in which the arm rotates to shift the valve body to the closed state.

Sub-arm before the valve body rotates in the valve closing direction due to the lowering of the weight after the arm is released by the locking lever in response to an emergency shutoff signal, etc. Is locked by the locking means, and the valve body stops at that position. For this reason, the valve body can be stopped once in the half-opened state before reaching the valve-closed state. After that, if the locking of the sub arm by the locking means is released, the valve body can be shifted to the closed state by the same weight descending.
That is, a series of operations for shifting the valve body of the emergency shut-off valve from the open state to the half-open state and once stopping at that position, and then moving the valve body to the closed state, to control the lowering of the same weight Is possible. Control of the lowering of the weight may be performed by stopping or releasing the rotation of the arm or the sub arm, and the series of operations can be facilitated because the operation of rotating the valve shaft by a clutch operation or a manual operation is not involved. In addition, the configuration of the apparatus can be simplified.

Since a series of operations to shift the valve body of the emergency shut-off valve to the open, half-open, and closed states is possible by controlling the lowering (falling) of the same weight, remote control of those This can be realized with an easy apparatus configuration. This is because the valve body can be shifted from the open state to the half-open state and the closed state by the same weight lowering.
Since a large number of emergency shut-off valves are distributed in various places and an operator cannot always go immediately to the place where the emergency shut-off valve is installed in an emergency, it is desirable to facilitate remote control in this way.

  In addition, after the valve body has shifted to the half-open state, it is determined whether the signal, etc. that should be sent to the emergency shutoff that was originally transmitted was a correct instruction or a false alarm, and if it was a correct instruction If the sub arm is unlocked by the locking means by remote control or the like, the valve body can be shifted to the closed state. Further, if it is a false report, the valve body is appropriately returned to the valve open state without releasing the locking of the sub arm by the locking means.

  In this configuration, by providing the locking means on the locking lever, it is possible to control the rotation of both the arm and the sub arm by controlling the swing of the same locking lever. For this reason, the structure of an apparatus can be simplified.

  Note that the locking means may be provided on a member different from the locking lever. For example, a configuration in which a locking lever different from the locking lever is provided so as to be swingable with respect to the valve box, and the sub-arm can be locked or unlocked by swinging the other locking lever. It can be.

  In each of these configurations, the rotation center of the arm and the rotation center of the sub arm are on the same line, and the arm and the sub arm are in the direction of the rotation center (direction in which the rotation center line extends). It is possible to employ a configuration in which the locking portion for the arm of the locking lever and the locking means are provided at different positions with respect to the direction of the rotation center.

  In particular, when the pivot center of the arm and the pivot center of the sub arm are on the same line, for example, when the arm and the sub arm are directly attached to the valve shaft, or the arm and the sub arm are linked to the valve shaft, respectively. Then, when it is attached to one shaft provided so as to rotate around the shaft, a portion (locking portion) for locking the arm of the locking lever and a locking means for locking the sub arm approach each other. . For this reason, for example, the arm touches the locking means, or the sub arm touches the locking portion of the locking lever, and the functions of the two tend to interfere with each other.

  Regarding this problem, since the pivot center of the arm and the pivot center of the sub-arm are on the same line, the positions of the arm and the sub-arm are shifted along the direction of the pivot center. This can be solved by shifting the configuration along the direction of the rotation center.

  A configuration in which the pivot center of the arm and the pivot center of the sub arm are not on the same line is also conceivable. For example, the arm is directly attached to the valve shaft, and the sub arm is attached to a single shaft provided to rotate around the shaft in conjunction with the valve shaft, or vice versa, that is, the sub arm is A configuration in which the arm is directly attached to the valve shaft and the arm is attached to a single shaft provided to rotate around the shaft in conjunction with the valve shaft is conceivable.

  Further, in each of these configurations, it is possible to employ a configuration including detection means having a function of detecting whether or not the locking means is locked to the sub arm.

  If there is a detection means, it is possible to immediately know that the valve body has shifted from the valve-open state to the half-open state by receiving a signal from the detection means.

  As the detection means, for example, a limit switch having a function of turning a signal on and off when a contact is touched to the sub arm when the sub arm rotates and reaches a predetermined position can be adopted. It is also possible to employ a non-contact type sensor having a function capable of detecting through light or infrared light that the sub arm is in a predetermined position without touching the sub arm.

  Further, the position where the detection means is provided may be a position where it can be detected that the sub arm is in a predetermined position by rotating, that is, the sub arm is locked by the locking means. It can be provided at an appropriate position such as a valve box or a frame fixed to the valve box.

  However, when the locking means is provided on the locking lever, the sub arm approaches the locking lever, so that the detection means can be provided on the locking lever. At this time, the detection means can employ a configuration provided at a position in contact with only the sub arm of the arm and the sub arm.

For example, as described above, it is assumed that the rotation center of the arm and the rotation center of the sub-arm are on the same line, and the arm and the sub-arm are shifted from each other along the rotation center. To do.
At this time, since the locking means corresponding to the sub-arm and the locking portion corresponding to the arm are also provided so as to be shifted along the rotation center, the detection means can avoid even a position that interferes with the rotation of the arm. What is necessary is just to determine according to the locus | trajectory of a sub arm, and there are few restraint conditions and the position is easy to determine.

  This invention controls the descending of the same weight in a series of operations for shifting the valve body of the emergency shut-off valve from the open state to the half-open state, stopping once at that position, and then moving the valve body to the closed state. Therefore, the operation of rotating the valve shaft by clutch operation or manual work is unnecessary, a series of work can be facilitated, and the configuration of the apparatus can be simplified.

Side view of one embodiment The embodiment is shown, (a) is a plan view, (b) is a front view. Side view showing the valve open state of the same embodiment The side view which shows the state in the middle of shifting from the valve opening state of the embodiment to a half-open state Side view showing the half-open state of the same embodiment The side view which shows the state in the middle of shifting to the valve closing state from the half-open state of the embodiment Plan view showing the positional relationship between the arm and sub arm (A)-(d) is each principal part enlarged view of Fig.3 (a)-(d). Perspective view of conventional example

An embodiment of the present invention will be described with reference to the drawings. The emergency shut-off valve 1 of this embodiment has a function of shutting off a pipeline based on a signal from a seismometer.
The configuration is a butterfly valve type in which the valve shaft 5 is inserted into the valve box 3 and the valve body 2 is integrally provided on the valve shaft 5 so as to be rotatable around the shaft. The main configuration excluding the sub arm 17 and the like described below is the same as that of the conventional example shown in FIG.

  As shown in FIGS. 1 and 2, an arm 7 is attached to one end of the valve shaft 5 so as to rotate around the shaft together with the valve shaft 5. A weight 6 is provided at the tip of the arm 7. A long locking lever 8 is provided on the frame 4 fixed to the valve box 3.

  The locking lever 8 is supported by a support pin 12 in the middle in the length direction, and can swing up and down around the support pin 12. A recess (locking portion) 8 a into which the pin 7 a provided on the arm 7 is fitted is formed on the lower surface of one end of the locking lever 8.

  In the normal state, the emergency shut-off valve 1 is configured to lock the concave portion 8a of the locking lever 8 to the pin 7a of the arm 7 with the arm 7 facing upward, as shown by a solid line in FIG. By this locking, the weight 6 is prevented from descending and the valve open state is maintained. FIG. 2B shows a valve open state (fully open state).

  Further, as indicated by a chain line in FIG. 1, the valve is set to be in a closed state (fully closed state) when the weight 6 is completely lowered and the arm 7 is not further rotated.

  On the side of the valve box 3, an electric actuator is arranged as the operating means 20 in the vertical direction. The rod 21 of the electric actuator is connected to the other end 8 b of the locking lever 8.

  In this embodiment, an electric actuator is employed as the operation means 20, but other operation means such as a hydraulic cylinder in which the rod advances and retreats by hydraulic control may be employed. Moreover, when operating the operation means 20 by a signal, the signal may be emitted from other than the seismometer.

  One end of the valve shaft 5 is attached with a sub arm 17 that rotates around the shaft together with the valve shaft 5. The sub arm 17, the arm 7, and the valve shaft 5 are integrally rotated and rotated around the axis.

As shown in FIG. 1, the rotation center of the arm 7 and the rotation center of the sub arm 17 coincide with the axis of the valve shaft 5 and are on the same straight line.
Further, as shown in FIG. 4, the pin 7a of the arm 7 and the pin 17a provided on the sub arm 17 are displaced with respect to the axial direction of the valve shaft 5 which is the center of rotation (in the drawing). The distance w1 shown in FIG.

  A recess (locking means) 18 into which a pin 17 a provided on the sub arm 17 is fitted is formed on the lower surface of one end of the locking lever 8. Further, the recess 8a and the recess 18 are shifted in position with respect to the axial direction of the valve shaft 5 as shown in FIG. 4 corresponding to the distance w1 between the sub arm 17 and the arm 7 (in the drawing). The distance w2 shown in FIG.

  In a state where the pin 17a of the sub arm 17 is fitted and locked in the recess 18 of the locking lever 8, the valve body 2 is at an intermediate position (half-open position) between the valve open state and the valve closed state. Is set to

  The locking lever 8 is provided with detecting means 30 having a function of detecting whether or not the pin 17a of the sub arm 17 is fitted in the recess 18 (presence / absence of locking).

The detection means 30 is a limit switch having a contact 31 as means for switching between a signal transmission state and a non-transmission state. As shown in FIG. 4, the contact 31 is not located on the locus of the arm 7 but is located on the locus of the sub arm 17. That is, the contact 31 is disposed at a position where it does not contact the arm 7 and can contact only the upper end 17 b of the sub arm 17.
When the sub arm 17 rotates and the pin 17a fits into the recess 18, the contact 31 touches the upper end of the sub arm 17, and a signal is transmitted to a predetermined location.

  The operation of the emergency shutoff valve 1 when an earthquake occurs will be described. When the seismometer (not shown) detects a seismic intensity of a predetermined value or more in a state where the arm 7 shown in FIG. Based on the emergency cut-off signal, the controller operates the rod 21 of the electric actuator in a contracting direction as indicated by an arrow in FIG.

  When the upper end position of the rod 21 is lowered, as shown by a chain line in FIG. 1, the other end 8b of the locking lever 8 moves downward, and on the contrary, the locking lever 8 swings in a direction in which the recessed portion 8a at one end rises.

  By this swinging, the pin 7a is pulled out of the recess 8a, and the locking of the arm 7 is released. When the locking of the arm 7 is released, the weight 6 urges the arm 7 to rotate downward by its own weight, and the arm 7 rotates together with the valve shaft 5 in the valve closing direction. Since the valve shaft 5 rotates, the valve body 2 also moves in the valve closing direction.

  FIG. 3A shows a state where the arm 7 is locked by the locking lever 8. Details of the positional relationship between the recess 8a and the pin 7a are shown in FIG.

FIG. 3B shows a state in which the locking lever 8 swings and the locking of the arm 7 by the locking lever 8 is released. The details of the positional relationship between the recess 8a and the pin 7a in this state are shown in FIG.
Further, when the locking of the arm 7 by the locking lever 8 is released, the rod 21 of the electric actuator once moves downward from the state shown in FIG. The original state shown in 3 (b) is restored.

After the locking of the arm 7 by the locking lever 8 is released, when the valve body 2 rotates in the valve closing direction, the sub arm 17 also rotates in the same direction, so that the valve body 2 is opened and closed. In the half-open state that is the middle of the pin, the pin 17a of the sub arm 17 is fitted into the recess 18 of the locking lever 8, as shown in FIG.
This is because the locking lever 8 is biased in a direction (clockwise direction in the drawing) in which the locking lever 8 is locked to the pin by an elastic body 19 such as a spring. Since the original state shown in FIG. 3B has been restored, the concave portion 18 of the locking lever 8 can catch the pin 17a of the sub arm 17 approaching by rotation (FIG. 3B). This is because it has returned to the position indicated by the chain line in FIG.

  Thus, the valve body 2 is maintained in a half-opened state by the sub arm 17 being locked by the locking lever 8.

  When the pin 17a of the sub arm 17 fits into the recess 18, the contact 31 touches the upper end of the sub arm 17, and the contact 31 is tilted laterally as shown in FIG. Thereby, a predetermined signal is transmitted to a necessary place. This signal means that the sub arm 17 has been rotated and the pin 17a has been fitted into the recess 18, so that the emergency shut-off valve has moved from the open state to the half open state at a remote location. It can be done.

  In this embodiment, a detection means 30 ′ is also provided below the valve shaft 5. When the contact 31 ′ of the detection means 30 ′ hits the auxiliary arm 11 that rotates integrally with the rotation of the valve shaft 5, the pin 7 a of the arm 7 is fitted in the recess 8 a, that is, the valve is kept open. A signal that means that the valve element 2 has been released from the open state when the contact between the contact 31 ′ and the auxiliary arm 11 is released or the contact is released. To come out.

  After the valve body 2 has transitioned to the half-open state, the operator of the device at the remote location that has received the signal confirms that the transition to the half-open state of the valve body 2 is not a malfunction. Or when the system which can confirm automatically whether it is not malfunctioning based on predetermined | prescribed data is constructed | assembled, a system makes the determination automatically.

  If it is confirmed that there is no malfunction, the controller causes the rod 21 of the electric actuator to be retracted based on the signal as shown in FIG.

  When the upper end position of the rod 21 is lowered, as shown in FIG. 3D, the other end 8b of the locking lever 8 moves downward, and on the contrary, the locking lever 8 swings in a direction in which the recessed portion 8a at one end rises.

  By this swinging, the pin 17a is pulled out of the recess 18 and the sub arm 17 is unlocked. When the locking of the sub arm 17 is released, the weight 6 urges the sub arm 17 and the arm 7 to rotate downward by its own weight, and the sub arm 17 and the arm 7 rotate together with the valve shaft 5 in the valve closing direction. Move. Since the valve shaft 5 rotates, the valve body 2 also moves in the valve closing direction, and when the valve 6 is finally closed, the lowering of the weight 6 is completed.

  In this embodiment, the arm 7 and the sub-arm 17 are locked by the same locking lever 8, but a configuration in which the arms 7 and the sub-arm 17 are respectively locked by separate locking levers is also conceivable. In addition, these locking methods are not limited to a locking method in which the pins 7a and 17a provided on the arm 7 and the sub arm 17 are fitted into the recesses 8a and 18 of the locking lever 8, for example, A method of restricting other general movement ranges, such as a configuration in which a pin is inserted in the pin and the pin can move in the direction in which the long hole extends to stop the pin at the end of the long hole, may be adopted. .

DESCRIPTION OF SYMBOLS 1 Emergency shut-off valve 2 Valve body 3 Valve box 4 Frame 5 Valve shaft 6 Weight 7 Arm 7a, 17a Pin 8 Locking lever 8a Engagement part (recessed part)
8b Other end 9 Damper 10 Orifice 11 Auxiliary arm 12 Pin 17 Sub arm 18 Locking means (concave)
20 Operating means 21 Rod 30, 30 'Detection means 31, 31' Contact p Pipe

Claims (5)

A valve body (2) is attached to a valve shaft (5) that is rotatably supported on the valve box (3), and the valve body (2) rotates about the axis together with the valve shaft (5), thereby 3) The valve hole in the inside can be freely opened and closed, and an arm (7) that rotates with the rotation of the valve shaft (5) is provided. The arm (7) is provided with a weight (6), and a fixed frame (4 ) Is provided with a locking lever (8) that can swing in the vertical direction, and the locking lever (8) is locked to the arm (7) to prevent the weight (6) from being lowered. When the valve body (2) is maintained open and the arm (7) is released from the locking lever (8), the arm (7) is lowered by the lowering of the weight (6). In an emergency shut-off valve that is adapted to rotate and rotate the valve element (2) in the valve closing direction,
A sub arm (17) that rotates as the valve shaft (5) rotates about its axis, and a locking means (18) that prevents the weight (6) from descending by locking to the sub arm (17), After the locking of the arm (7) by the locking lever (8) is released, the locking means (18) is moved before the valve body (2) rotates in the valve closing direction to reach the valve closing state. By engaging the sub arm (17), the valve body (2) is maintained at a position between the valve closed state and the valve open state, and the engagement of the sub arm (17) by the locking means (18). When the stop is released, the arm (7) is rotated by the lowering of the weight (6) to shift the valve body (2) to the closed state.   The emergency shut-off valve according to claim 1, wherein the locking means (18) is provided on the locking lever (8). The rotation center of the arm (7) and the rotation center of the sub arm (17) are on the same line, and the arm (7) and the sub arm (17) are at different positions with respect to the direction of the rotation center. Provided in
The locking portion (8a) for the arm (7) of the locking lever (8) and the locking means (18) are provided at different positions with respect to the direction of the rotation center. The emergency shut-off valve according to claim 2.   The emergency means according to any one of claims 1 to 3, further comprising a detection means (30) having a function of detecting whether or not the locking means (18) is locked to the sub arm (17). Shut-off valve.   The detecting means (30) is provided on the locking lever (8), and is provided at a position where only the sub arm (17) contacts the arm (7) and the sub arm (17). The emergency shut-off valve according to claim 4 quoting claim 2.

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