JP2020103661A - Water flow detector - Google Patents

Abstract

To provide a water flow detector.SOLUTION: A water flow detector V1 comprises: a hollow body 1 connected to extinguishment facility piping; a valve 7 having a swing check valve structure inside the body 1; a rod 11 that has one end 11A engaged with the valve 7 and the other end 11B protruding to the outside of the body 1 and is displaced by opening/closing operation of the valve 7; an aperture 1a through which the valve 7 is taken out from the body 1 and put in; a cover 1b having a plurality of bolt holes arranged at even angle intervals on one circle at a position corresponding to an edge of the aperture 1a; and a switch 17 that is provided on the cover 1b and outputs a signal via displacement of the other end 11B of the rod 11. A part at which the valve 7 is engaged with the rod 11 is disposed at a position deviated from a linear line L passing through centers of the cover 1b and the aperture 1a.SELECTED DRAWING: Figure 2

Description

The present invention relates to a flowing water detection device installed in a fire extinguishing equipment pipe.

In fire extinguishing equipment such as sprinkler equipment and foam extinguishing equipment, a water flow detection device is installed on a pipe that extends from a water source to a sprinkler head (or foam head). The water flow detection device has a check valve structure and allows only one-way water flow from the water source to the sprinkler head.

As a conventional water flow detection device, for example, there is one described in Patent Document 1. As shown in FIG. 9, this water flow detecting device converts the opening operation of the valve body 51 into the displacement of the rod 52 and the lever 53 to activate the switch 54. The rod 52 is pivotally supported in the middle, one end side of which is engaged with a protruding portion 51a installed on the edge of the valve body 51, and the weight W acts on the other end side of the rod 52. A load is applied to the valve body 51 in the valve opening direction by the weight W, and the rod 52 is displaced by the load following the operation of the valve body 51 when the valve is opened. In the water flow detection device of Patent Document 1, the rod 52, the lever 53, the switch 54, and the like described above are installed on the cover 55 that closes the opening of the main body 51.

In the above-described water flow detection device, after performing the maintenance work by opening the cover 55, the cover 55 is closed and the tip of the rod 52 is engaged with the protruding portion 51a of the valve body 51 to perform the restoration work for returning to the initial position. At that time, one end side of the rod 52 is located above the initial position by the weight W acting on the rod 52 as described above. In this state, however, one end side of the rod 52 and the protruding portion 51a of the valve body 51 are in this state. Will interfere. Therefore, when the reset portion 56 installed below the valve body 51 is operated to close the cover 55 with the valve body 51 slightly opened, and then the reset portion 56 is returned to its original position, the valve body 51 is set to the closed position. Then, the projecting portion 51 and the one end side of the rod 52 are brought into the engaged initial state.

JP2012-217777A

In the above-described water flow detection device, it is difficult to reduce the size of the main body because the reset unit is installed in the primary side chamber. In addition, the operation handle of the reset unit is located below the cover, and there is a possibility that the operator may forget to release the reset unit after closing the cover. Therefore, in the restoration work, it is necessary to pay sufficient attention and confirmation that the valve body and the rod are properly engaged after the work is completed.

In recent years, work efficiency has been promoted even at construction sites due to a shortage of workers, but valve devices such as water flow detection devices have a relatively small size and weigh several tens of kilograms, improving work efficiency. Therefore, the demand for weight reduction is increasing.

Therefore, in view of the above problems, it is an object of the present invention to provide a water flow detection device that enables downsizing of a main body and can reliably set a rod to an initial position when a cover is attached to the main body after maintenance or the like. ..

In order to achieve the above object, the present invention provides the following water flow detection device.
A hollow main body connected to fire extinguishing equipment piping, a valve having a swing check valve structure inside the main body, one end engaged with the valve, and the other end protruding outside the main body to open and close the valve. An opening having a rod which is displaced by an operation, an opening through which the valve can be put in and taken out from the main body, and a plurality of bolt holes arranged at equal angular intervals on one circumference at a position corresponding to an edge of the opening. And a switch that is installed on the cover and that outputs a signal according to the displacement of the other end side of the rod, the flowing water detecting device comprising: an engaging portion between the valve and the rod; It was constructed by arranging it at a position off the straight line passing through the center.

In the present application, the engagement portion between the valve and the rod is arranged at a position deviated from the straight line passing through the center of the cover and the opening, so that the direction of the cover corresponding to the opening can be limited to one. Specifically, when the cover is attached at an incorrect position, one end of the rod interferes with the valve, so that there is a gap between the cover and the opening, so that the opening cannot be closed by the cover. In addition to this, if a flange portion that engages with the valve is installed at one end of the rod, the flange portion increases the area on the one end side of the rod. This makes it easier for the valve and rod to interfere when the cover is installed in the wrong position.

The valve is provided with a protrusion toward the opening side. When the protrusion is engaged with one end of the rod, the area of the one end of the rod and the engagement portion of the valve can be widened. The protrusion can also be used as a grip when removing the valve from the opening.

One end of the rod is biased in the valve opening direction by a biasing member installed separately, and engages with the lower surface of the protrusion. When the valve is opened, one end of the rod is also rotated by following the valve opening direction by the action of the biasing member. The rotation range of the rod is restricted, and when the valve is opened for a predetermined amount or more, the protruding portion and one end of the rod are separated from each other, and the rod is in a moored state at a predetermined position. When the opened valve returns to the closed state, one end of the rod is re-engaged with the protrusion and returns to its original initial position.

Further, the flowing water detection device of the present invention has a lock device which can hold/release the rod at the initial position near the other end of the rod. When the lock device is used, the displacement of the rod by the biasing member is prevented, the rod is held at the initial position, and one end of the rod can be reliably engaged with the protrusion when the cover is attached. This eliminates the trouble of holding the rod in the initial position with a finger or the like when the cover is attached.

The handle of the locking device is in a state of protruding from the edge of the cover while holding the rod, so that the holding/unholding state of the locking device can be easily determined. Further, by installing the lock device on the cover, the height dimension of the main body can be made smaller than that of the above-described prior art flowing water detection device.

ADVANTAGE OF THE INVENTION According to this invention, the main body can be reduced in size, and when the cover is attached to a main body after maintenance etc., the flowing water detection apparatus which can set a rod to an initial position reliably can be implement|achieved. Further, the holding/unholding state of the lock device can be easily determined, and the restoration work can be surely performed in maintenance work or the like.

The front view of the flowing water detection apparatus of 1st Embodiment. AA sectional drawing of FIG. FIG. 3 is a sectional view taken along line BB of FIG. 2. (A) is a perspective view of a valve body, (b) is sectional drawing of a valve body. The expanded sectional view of the housing part shown in FIG. CC sectional drawing of FIG. 2 (at the time of lock release). CC sectional drawing of FIG. 2 (at the time of locking). (A) is a front view of the running water detecting device without the cover, and (b) is a front view of the running water detecting device without the cover when the mounting position of the cover is incorrect. (A) and (b) are modified examples in which the position of the female screw installed near the opening is shifted, and (c) is a modified example in which the female screw is installed separately from the female screw installed near the opening. It is sectional drawing of the conventional water flow detection apparatus, (a) is explanatory drawing which shows the positional relationship of a valve body, a rod, a lever, etc. (B) is an explanatory view of the reset unit.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 8. The water flow detection device V1 of the first embodiment includes a main body 1, a housing 2, and a drain valve 3.

The main body 1 has a hollow shape, and the inside is divided into a primary side chamber I and a secondary side chamber II by a partition wall 4. A communication hole 5 is formed in the partition wall 4, and an annular valve seat 6 is installed on the secondary chamber II side of the communication hole 5.

A valve body 7 is seated on the valve seat 6, a cylindrical bearing 8 is formed on a part of the peripheral edge of the valve body 7, and two valve rods 9 penetrate the side surface of the main body 1 to receive the bearing. It is inserted in the hole of 8. The valve rod 9 is shorter than the bearing 8 and can be easily attached and detached even when there is almost no working space around the main body 1. Further, the tip portion of the valve rod 9 which is inserted into the hole of the bearing 8 has a tapered shape, and can be easily inserted even when the hole of the bearing 8 is invisible.

The valve body 7 is configured to be rotatable around the valve rod 9 in the secondary side II direction. When the valve body 7 rotates, the valve body 7 is separated from the valve seat 6 and the fluid in the primary side chamber I is circular. It becomes possible to pass through the inside of the valve seat 6 to the secondary side chamber II. The valve body 7 has a skirt 7a arranged inside the valve seat 6 when the valve body is closed. The skirt 7a extends to the primary side I from the valve seat seating surface of the valve body 7 in the valve closed state, and when the valve body 7 opens from the valve closed state, flows through the valve seat 6 by the skirt 7a. The passing area of water is reduced, and the rotation angle of the valve body 7 is amplified.

The valve body 7 is provided with a protruding portion 10 formed so as to protrude from the edge. As shown in FIG. 1, an opening 1a shown by a broken line is provided on the front surface of the main body 1, and a cover 1b for closing the opening 1a is provided. The protruding portion 10 of the valve body 7 is arranged on the front side near the opening 1a, and the bearing 8 is arranged on the rear side. In this way, the protruding portion 10 is installed at the position farthest from the bearing 8. The width of the protrusion 10 is substantially the same as the width of the bearing 8. Further, as shown in FIG. 4, the valve body 7 is formed with a convex portion 7b whose upper portion is curved in a convex shape, whereby the weight of the valve body 7 is ensured and the valve body 7 is taken out from the circular opening 1a. In this case, it is possible to avoid the interference between the opening 1a and the valve body 7.

As shown in FIG. 4, the valve body 7 has a disk portion 7c between the bearing 8 and the protruding portion 10, a skirt 7a is installed below the disk portion 7c, and a convex portion 7b is installed above it. .. The opening 1a, the bearing 8, and the protrusion 10 are arranged on a straight line that intersects with a virtual plane (for example, the plane of the cover 1b) parallel to the center line (the line AA in FIG. 1) of the main body. With such a configuration, the width of the opening 1a can be suppressed to the minimum dimension through which the disc portion 7c can pass.

The valve body 7 is provided with the skirt 7a, the convex portion 7b, and the protruding portion 10 as described above. With these configurations, the weight of the valve body 7 is secured and stable water stoppage is obtained. More specifically, when the secondary side II is decompressed due to a minute leak from the joint of the pipe connected to the secondary side II and the auxiliary pump (not shown) is started for a short time, the valve body 7 opens to open the secondary side. Water is sent to II. When the pressure on the secondary side II recovers above a predetermined level, the auxiliary pump stops and the valve body 7 returns to the closed state. At that time, the skirt 7a, the convex portion 7b, and the protruding portion 10 function as a weight, and the valve body 7 quickly returns to the closed state to obtain water stopping performance. With these configurations, the volume occupied by the valve body 7 in the internal space of the main body 1 is large, which has been a problem in reducing the size and weight of the main body 1. With the above configuration, it is possible to reduce the size and weight of the main body 1.

An end 11A of a rod 11 installed through the cover 1b is in contact with a surface of the protrusion 10 on the valve seat 6 side. The rod 11 is pivotally supported in the middle, and the rod 11 is configured to be vertically rotatable in the drawing.

An end 11B of the rod 11 opposite to the end 11A that is in contact with the valve body 7 protrudes from the cover 1b to the outside and is covered with the housing 2. As shown in FIG. 5, at the end 11B, a spring seat 12 provided so as to project upward in the drawing is installed, and on the same axis as the spring seat 12, the other spring seat 13 installed on the base 2a of the housing 2 is installed. Is provided. A coil spring 14 is provided as a resilient body (biasing member) between the spring seats 12 and 13.

The end 11B of the rod 11 is always urged downward in the figure by the coil spring 14. The intermediate shaft 19 of the rod 11 urges the end 11A on the opposite side of the end 11B upward in the figure, that is, in the direction in which the valve body 7 opens, but the force exerted by the coil spring 14 is weak enough not to open the valve body 7. Power. When the projecting portion 10 separates from the end 11A of the rod 11, the rod 11 is rotated by the action of the coil spring 14 and moved to a position displaced from the initial position when the valve is closed.

At the end 11B of the rod 11, a contactor 16 that contacts the operating piece 15 is rotatably installed. The spring seat 12 is mounted on one end of the contactor 16, and the contactor 16 and the rod 11 are always on the same straight line by the action of the coil spring 14. At the other end of the contactor 16, a bending portion 16a at the tip thereof locks the operating piece 15, and the operating piece 15 is arranged apart from the limit switch 17.

In the figure, a delay mechanism 18 is installed above the operating piece 15. The delay mechanism 18 has a function of delaying the operation of the operating piece 15, and has a structure using an air damper or an oil damper. The delay mechanism 18 prevents the limit switch 17 from outputting a signal when the auxiliary pump described above is activated. Detailed description of the delay mechanism 18 is omitted.

The housing 2 includes a base 2a and a lid 2b. The spring seats 12 and 13, the coil spring 14, the operating piece 15, the contact 16, the limit switch 17, and the delay mechanism 18 described above are installed on the cover 1b. It is housed inside.

The base 2a is plate-shaped and has a hole through which the rod 11 is inserted. The rotation shaft 19 of the rod 11 is installed on the surface of the base 2a facing the cover 1b, and the handle 20 is installed on the opposite surface of the base 2a as a locking device capable of blocking the operation of the rod 11 (see FIG. 6). ). The handle 20 has an elongated plate shape, and has an elongated hole 21 in an intermediate portion. One end side of the handle 20 is an engaging portion 22 with the rod 11, and a taper portion 22A that tapers toward the tip side is formed. The tip 22B is formed in a rounded curved shape. The other end side is an operation unit 23 which the operator grips with his/her hand to move the handle 20.

As shown in FIG. 6, the handle 20 always has the operating portion 23 housed in the base 2a (unlocked state). When the handle 20 is rotated clockwise in the drawing and pushed in the direction of the rod 11, the movement of the rod 11 can be blocked, and the operating portion 23 is in a state of protruding from the base 2a (lock state). Thus, the operator can easily determine that the limit switch 17 cannot output a signal due to the positional relationship between the operation unit 23 and the base 2a.

Further, even if the operator tries to attach the cover 2b to the base 2a in the locked state, the operation portion 23 is in a state of protruding from the base 2a, so that the cover 2b cannot be attached to the base 2a. As a result, even a person who is not accustomed to the work can feel the abnormality because the cover 2b cannot be attached to the base 2a, and the locked state can be released by reporting the situation to another skilled worker and coping with it.

Stoppers 28A and 28B are formed on the base 2a as protrusions for guiding the operation when the handle 20 is rotated. When the handle 20 is rotated clockwise from the unlocked state to the locked state, the handle 20 comes into contact with the stopper 28A and is rotated by about 90° from the original position. The protrusion 28A has a function of a stopper for preventing the handle 20 from rotating further, and the handle 20 has a restricted angular range in which it can rotate (see FIG. 7).

As shown by the broken line in FIG. 7, when the handle 20 is slid along the elongated hole 21, the tapered portion 22A of the engaging portion 22 moves along the peripheral surface of the rod 11. At that time, even if the rod 11 is slightly inclined downward and the rod 11 is in contact with the tapered portion 22A, the handle 20 can be smoothly slid without being caught. At the same time, the tip 22B of the handle 20 slides while contacting a guide portion 28C formed by rounding a part of the edge of the stopper 28B.

By the sliding movement of the handle 20, the tip 22B of the engaging portion 22 is guided onto the stopper 28B, and the side 22C opposite to the taper portion 22A engages with the stopper 28B. At the same time, the stopper 28A also comes into contact with one side of the handle 20, and is held in a state in which there is almost no gap between the stopper 28A, 28B and the handle 20. This allows the handle 20 to hold the locked state in which the rod 11 is prevented from moving.

In this state, the drain valve 3 is installed in the direction of the handle 20 protruding from the base 2a. Accordingly, when the cover 1b is attached to the opening 1a from the removed state, the cover 1b can be correctly attached to the opening 1a by aligning the direction of the handle 20 with the direction in which the drain valve is installed.

The cover 2b covers the limit switch 17 and the delay mechanism 18 installed on the base B and a terminal block (not shown) to protect them from dust and water drops. When the cover C is removed, the internal structure of the housing 2 supported by the L-shaped base 2a is largely exposed. Therefore, workability of connection work and inspection work of the limit switch 17 and the terminal block accommodated in the housing 2 is performed. Is good.

The drain valve 3 is a valve for discharging the fluid in the main body 1 to the outside at the time of inspection and maintenance, and is installed on one side surface of the main body 1. The inside of the drain valve 3 has an angle valve structure, and the discharge port is provided downward in FIG.

On the secondary side II of the main body 1, a cylindrical housing portion 1d for housing the valve body 7 when opened is installed, and a bearing 8 is installed below the housing portion 1d. The accommodating portion 1d has a tubular shape and extends to the back side of the main body 1, and a part of the accommodating portion 1d extends to the inner peripheral portion of the secondary side II flange F2 of the main body 1. The inner diameter of the housing portion 1d is larger than the outer diameter of the disc portion 7c of the valve body 7, and has a curved back surface 1e following the shape of the convex portion 7b of the valve body 7. In the opened state of the valve body 7 shown by the chain double-dashed line in FIG. 2, a protrusion 1f that is in contact with the valve body 7 when the valve body 7 is opened is provided at substantially the center of the back surface 1e.

The valve body 7 is provided with a skirt 7a and a protruding portion 10. When the valve body 7 is fully opened, the skirt 7a and the protruding portion 10 impede the flow. The rotation amount of 7 can be increased to reduce the pressure loss when a large amount of water flows from the primary side I to the secondary side II of the main body 1. Further, by providing the housing portion 1d, the size from the partition wall 4 to the secondary side flange F2 is reduced, the height size of the main body 1 is suppressed, and the main body 1 can be downsized.

In FIG. 2, a straight line L passing through the centers of the opening 1a and the cover 1b is arranged above the rod 11 in the figure. FIG. 8 is a front view of the water flow detection device V1 with the cover 1b removed, and the circle indicated by the broken line represents the flange portion 11F installed at the end 11A of the rod 11.

FIG. 8A shows an engagement state between the flange portion 11F of the rod 11 and the protruding portion 10 when the cover 1b is attached to the opening 1a at the correct position. In FIG. 8A, the straight line L is shown by a point L, and the flange portion 11F is engaged with the lower surface of the protrusion 10. The point L is arranged below the lower surface of the protrusion 10.

On the other hand, FIG. 8B shows the position of the flange portion 11F when the mounting position of the cover 1b is incorrect. 8(b), the position of the flange 11F is arranged at a position rotated around the point L with respect to the position of the flange portion 11F in FIG. 8(a). Since the surface of 10 interferes with the surface of the opening 1a, the cover 1b cannot be attached to the opening 1a.

Next, the operation of the water flow detection device V1 during a fire will be described.

In the flowing water detection device V1, the primary side I is connected to a water source or a pump (not shown), and the secondary side II is connected to a sprinkler head (not shown). The inside of the fire extinguishing equipment pipe is filled with water, and the inside of the main body 1 of the water flow detection device is also filled with water in the primary side chamber I and the secondary side chamber II. In normal time, the valve body 7 of the flowing water detection device V1 is in a closed state in which it is seated on the valve seat 6, and the water pressures on the primary side I and the secondary side II are substantially equal.

When a fire occurs and the sprinkler head installed in the pipe on the secondary side chamber II side operates, the water in the pipe on the secondary side chamber II side is discharged from the sprinkler head and gradually depressurizes. When the pressure of the water in the secondary side chamber II that has closed the valve body 7 decreases and becomes lower than the pressure in the primary side chamber I, the valve body 7 is pushed up due to the pressure difference between the secondary side chamber II and the primary side chamber I, and the valve rod 9 Rotate around the fulcrum. The amount of water discharged from the sprinkler head is small enough to slightly rotate the valve body 7 of the water flow detection device V1, but the water passage area inside the valve seat 6 is narrowed by the skirt 7a. Therefore, the rotation amount of the valve body 7 is amplified.

Since the valve body 7 is separated from the valve seat 6 and opened, the water in the primary side chamber I is sent to the secondary side chamber II side. At the same time, the rod 11 engaged with the protruding portion 10 by the rotation of the valve body 7 rotates about the shaft 19 as a fulcrum by the coil spring 14 installed at the end 11B. As a result, the end 11A moves in the valve opening direction and the end 11B moves in the direction of the limit switch 17.

The operating piece 15 locked by the end 11B is unlocked by the movement of the end 11B, and moves toward the limit switch 17 by the action of a biasing member (not shown) in the delay device 18. At that time, the operation piece 15 becomes slow in operation by the delay device 18, and the limit switch 17 is operated several seconds to ten and several seconds after the locking of the end 11B is released.

An alarm is output to a reception panel (not shown) by the operation of the limit switch 17, and the evacuation guidance is prompted by notifying the occurrence of a fire in the building. Subsequently, the pump is activated to start water supply from the water source to the activated sprinkler head. When water supply is started by starting the pump, the valve body 7 is fully opened and accommodated in the accommodation portion 1d. Water is continuously sprayed from the sprinkler head to extinguish the fire.

Subsequently, a method of attaching and detaching the cover 1b in the water flow detecting device V1 will be described.

The running water detection device V1 is installed on the fire extinguishing equipment pipe, and the inside thereof is always filled with water. When cleaning or maintaining the inside of the flowing water detection device V1, the drain valve 3 is opened to drain the water in the pipe, and then the cover 1b is removed.

At that time, before removing the cover 1b, the lid 2b of the housing 2 is removed and the handle 20 is rotated toward the drain valve 3. The rotation of the handle 20 prevents the rod 11 from moving, and the rod 16 is held in the initial state in which the contact 16 and the operating piece 15 are engaged with each other.

After removing the cover 1b, the valve body 7 is then taken out from the opening 1a. Before that, the two valve rods 9 are removed from the side surface of the main body 1 and the valve rod 9 is pulled out from the bearing 8. Then, the valve body 7 is taken out from the opening 1a. At that time, the valve body 7 is first moved upward to pull out the skirt 7a from the valve seat 6 to take out the valve body 7 from the opening 1a. At this time, it is easy to perform the work by moving the valve body 7 by pinching the protrusion 10 arranged near the opening 1a with a finger.

With the valve body 7 removed from the body, the inside of the body 1 is cleaned and parts of the valve body 7 are replaced. After the work is completed, the valve body 7 is installed in the main body 1 in the reverse order of the above removal procedure. After the valve rod 9 is installed on the bearing 8 of the valve body 7, the cover 1b is attached to the opening 1a.

The cover 1b is provided with the rod 11 that engages with the protruding portion 10 of the valve body 7, and if the end 11A of the rod 11 is not correctly set to the original position, the water flow detection device V1 may obtain the original function. Can not. However, the cover 1b is provided with four bolt holes on the outer edge portion, and since the bolt holes are arranged at equal angles on one circumference, regardless of the orientation of the housing 2 installed on the cover 1b. It can be attached to the main body 1 without using.

Therefore, if the direction of the handle 20 and the installation direction of the drainage valve 3 are aligned and the cover 1b is attached to the opening 1a, the end 11A of the rod 11 can be correctly set on the protrusion 10. Furthermore, since the rod 11 is held in the initial position where the valve body 7 is closed by the handle 20, the end 11A and the protrusion 10 can be easily engaged.

When the attachment of the cover 1b is completed, the handle 20 is rotated so as to be housed inside the base 2a and is returned to the original state. As a result, the rod 11 returns to the unlocked state. Further, the lid 2b is attached to the base 2a to complete all the work.

As described above, the housing 2 installed on the cover 1b has the handle 20 as an identification portion for confirming the mounting position of the main body 1. As a modified example of the above-mentioned identification section, an identification display may be provided on the surface of the cover 1b to show the position where the cover 1b is aligned with the main body 1. For example, in the cover 1b, an identification display may be provided by letters or surface irregularities in the direction in which the drain valve 3 is installed. Further, in accordance therewith, a similar identification display can be provided on the body 1 side around the cover 1b.

Alternatively, the cover 1b may be installed such that the connection part with the housing installed on the surface of the cover 1b is located on the primary side (bottom side) of the main body 1, or the fixing screw 2c for fixing the base 2a and the lid 2b of the housing 2 may be fixed to the main body 1. You may install so that it may be located in the primary side.

As a modification other than the above, FIG. 9 shows a modification of the bolt holes of the cover of the first embodiment. 9A to 9C show a plurality of female screw holes m provided at the edge of the opening 1a. It is assumed that a bolt hole corresponding to the female screw hole m is installed in the cover 1b. A plurality of female screw holes m are arranged on the circle C1 at equal angular intervals.

In FIG. 9A, the center of one female screw hole m1 is arranged at a position deviated from the circle C1. The cover 1b (not shown) is also provided with bolt holes at positions corresponding to the female screw holes m1, and the cover 1b is provided only when the female screw holes m, m1 and the cover 1b all correspond to the opening 1a. The cover 1b is attachable. As a configuration with which the same effect can be obtained, in FIG. 9B, two female screw holes m2 arranged in the upper part of the drawing are arranged at intervals different from the uniform angular intervals of the female screw holes m shown by the two-dot chain line. did.

Further, in FIG. 9C, a female screw hole m3 is provided separately from the female screw hole m. Thus, the operator can intuitively understand the mounting position of the cover 1b from the positions of the female screws m and m3 on the opening 1a side and the corresponding bolt holes of the cover 1b.

1 body
1a opening
1b cover
2 housing
3 drain valve
6 valve seat
7 valve body (valve)
8 bearings
9 valve rod
10 Projection
11 rod
12 spring seat
14 Coil spring (biasing member)
15 Working piece
17 Limit switch
18 Delay mechanism
20 Handle (locking device)
21 slot

Claims (10)

A hollow body connected to fire extinguishing equipment piping,
Inside the main body is a valve with a swing check valve structure,
A rod, one end of which is engaged with the valve, the other end of which protrudes outside the main body, and which is displaced by the opening/closing operation of the valve;
An opening through which the valve can be taken in and out of the body,
A cover for closing the opening having a plurality of bolt holes arranged at equal angular intervals on one circumference at a position corresponding to the edge of the opening;
A switch installed on the cover that outputs a signal when the other end of the rod is displaced,
Is a water flow detector equipped with
A water flow detection device, wherein an engaging portion between the valve and the rod is arranged at a position deviated from a straight line passing through the center of the cover and the opening. The running water detection device according to claim 1, wherein a flange portion that is engaged with the valve is installed at one end of the rod. The running water detection device according to claim 1 or 2, wherein a protrusion is provided on the valve toward the opening side, and the protrusion is engaged with one end of the rod. The water flow detection device according to any one of claims 1 to 3, wherein one end of the rod is engaged with a lower surface of the protrusion to urge the valve in a valve opening direction. The running water detection device according to any one of claims 1 to 4, wherein, in the plurality of bolt holes, the center of at least one bolt hole is arranged at a position deviated from the circumference. The running water detection device according to any one of claims 1 to 4, wherein at least one bolt hole in the plurality of bolt holes is arranged at an interval different from a uniform angular interval. The running water detection apparatus according to any one of claims 1 to 4, wherein, in the plurality of bolt holes, at least one bolt hole is arranged separately from the bolt holes in the cover. The running water detection device according to any one of claims 5 to 7, wherein a female screw is installed at a position corresponding to the bolt hole on the edge of the opening. The water flow detection device according to any one of claims 1 to 8, further comprising a lock device near the other end of the rod, the lock device being capable of holding and releasing the rod at an initial position. The switch and the lock device are covered by a housing provided with a base installed on the cover and a lid attached to the base, and the lid is attached to the base when the rod is held by the lock device. The flowing water detection device according to any one of claims 1 to 9, which cannot be attached.

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