JP6270464B2 - Flowing water detector - Google Patents

Description

  The present invention relates to, for example, a flowing water detection device that is used for sprinkler equipment and is used for detecting flowing water when a fire occurs, and particularly suitable for detecting a large-diameter channel.

  Usually, the sprinkler equipment is provided with a water flow detection device to detect that the sprinkler has been activated. The flowing water detection device has a check valve structure that operates by water pressure, and the valve body is opened in response to the opening of the sprinkler in the event of a fire, and the flow path is opened. A signal is detected when it is open. In this case, for example, a configuration in which an open state is detected in a state where the primary side and the secondary side of the flowing water detection device are filled with water is used. In general, an automatic alarm valve type for detecting the water flow, and a rotary operation valve type water flow detection device for detecting rotation of the shaft with a switch when the valve is opened and closed are generally known.

Among these water flow detection devices, for example, the water flow detection device of Patent Document 1 is disclosed as an automatic alarm valve type. In this flowing water detection device, a pressure detection hole is provided in the valve seat surface, and when the valve body is opened, fluid flows into the pressure detection hole, and pressure is introduced into a pressure switch provided after the pressure detection hole. Thus, a detection signal is emitted.
On the other hand, as a working valve type, for example, a flowing water detection device of Patent Document 2 is disclosed. In this flowing water detection device, a valve opening detection mechanism is arranged via a lever shaft (rod shaft) at a portion facing the bearing of the valve body of the check valve structure so that detection can be performed even when the valve opening is small. It has become. In this valve opening detection mechanism, a tension coil spring is used to follow the operation of the valve body of the check valve structure.

  In this case, the fire detection law stipulates that the flowing water detection device must detect a signal at the time of opening the valve at a specified water amount, for example, a flow rate of 50 L / min regardless of the diameter. This type of water flow detection device has a large-diameter flow path, and even when the valve body becomes large or heavy, the specified flow rate is lower and lower than the general check valve when the sprinkler is opened. It is necessary to detect running water. It is also necessary to prevent malfunctions due to back pressure from other drainage pipes.

JP 2007-259899 A Japanese Patent No. 4616418

  The automatic alarm valve type water flow detection device as in the former Patent Document 1 needs to provide a separate drain flow path for automatic recovery after the sprinkler is activated, and by providing this drain flow path, dust clogging occurs. There is a possibility that the valve body cannot be operated normally due to the fact that dust is caught in the seat surface, or when a reverse pressure is generated during drainage of other systems, a false alarm is generated.

  On the other hand, in the case of a working valve type flowing water detection device, a rod shaft different from the rotating shaft of the valve body is used as in the latter patent document 2 in order to ensure that the valve body operates even when the valve opening is small. When the valve opening detection mechanism is provided, the number of seals to prevent external leakage of the fluid increases, and the valve opening is detected when dust or deposits in the fluid are caught on the rod shaft or rust is generated. The mechanism may not operate correctly, or corrosion may occur because the rod shaft side is always exposed to the flow path. This mechanism using a tension coil spring on the rod shaft does not bias the valve body from the fully closed state to the fully open state, but is merely a mechanism for following the operation of the valve body from the fully closed state to the predetermined open state. In addition, since it is urged by the tension coil spring, there is a problem that a large installation space is required.

  The present invention has been developed in order to solve the conventional problems, and the object of the present invention is to provide a mechanism and parts for detecting flowing water separately in the flow path or in a special flow path structure. An object of the present invention is to provide a water flow detection device that can operate at a valve opening required for detection at a specified flow rate while preventing malfunction even in the case of a large-diameter flow path with a simple configuration.

To achieve the above object, the invention according to claim 1 is provided with a check valve body via a rotary shaft provided at one end of the disk-shaped check valve body provided in the body rotatably, reverse A switch mechanism for detecting the turning motion of the stop valve body is housed in a case body provided outside the body, and a spring member attached to the rotating shaft is disposed inside the case body. This is a flowing water detection device which is a member having a resilient force in the valve opening direction of the body and accumulating the resilient force in the valve opening direction due to its own weight .

In the invention according to claim 2, the spring member is a torsion coil spring provided around the rotation axis of the check valve body .

  According to a third aspect of the present invention, the torsion coil spring is engaged with an engaging portion provided at one end of the switch mechanism and an engaging portion provided on an operating plate coaxially attached to the rotating shaft. This is a flowing water detection device that provides a resilient force around the rotation axis.

In the invention according to claim 4, the spring member is a constant load spring provided on the rotating shaft of the check valve body .

  The invention according to claim 5 is the flowing water detection device in which the constant load spring is provided with an elastic force around the rotation axis by attaching an end portion to an operation plate attached coaxially to the rotation axis.

According to the first aspect of the invention, since the valve opening degree of the check valve body necessary for detecting the specified flow rate is obtained via the spring member provided on the rotating shaft, it is used for detecting flowing water in the flow path. Without a separate mechanism or parts, or with a special flow path structure, the valve opening is sufficient for detection even in the case of a small specified flow rate while preventing malfunction even with a large-diameter flow path with a simple configuration. The check valve body is largely operated to reliably detect the signal. There is little risk of clogging or biting inside, preventing false alarms and preventing size increases and maintaining compactness. The operating angle of the check valve body can be set by adjusting the elastic force of the spring member, and the check valve body can be accurately operated up to a predetermined valve opening. In addition, since the switch mechanism for detecting the rotational movement of the check valve body is housed in the case body provided outside the body and the spring member attached to the rotating shaft is disposed inside the case body, the spring member is always fluid. It is not exposed to rust such as corrosion, there is no risk of malfunction due to rust such as corrosion, it is excellent in durability by reliable operation, and it is also possible to prevent vibration of the check valve body in the fully opened state. Since the spring force of the spring member is accumulated by the dead weight of the check valve body at the time of closing, the initial operation can be surely performed with this accumulated elasticity.

  According to the invention of claim 2, since the spring member is a torsion coil spring, the elastic force can be increased by setting the initial spring angle. The check valve body can be smoothly opened during flowing water from the time to the time of full opening, and the required valve opening can be obtained at the specified flow rate. By disposing the torsion coil spring coaxially with the rotation shaft, the torsion coil spring does not disturb the check valve body and prevent the rotation operation. Even in the fully open state, the elastic force of the torsion coil spring is applied to the check valve body, so that the check valve body can be prevented from vibrating. Since the elastic force of the torsion coil spring is accumulated by the self-weight of the check valve body when the valve is closed, the check valve body can surely perform the initial operation with the accumulated elastic force.

  According to the invention of claim 3, the torsion coil spring can be built in the switch mechanism while reducing the size, and the torsion coil spring operates the operating plate to give a resilient force around the rotation axis. During the opening operation, the check valve body can be reliably rotated to the valve angle required for detecting the specified flow rate.

  According to the invention of claim 4, by making the spring member a constant load spring, a constant load is applied in the valve opening direction at the time of running water, and the check valve body is operated with a stable operation from a small opening degree at the time of running water. Can be rotated. Since the elastic force of the constant load spring is accumulated by the self-weight of the check valve body when the valve is closed, the check valve body can surely perform the initial operation with the accumulated elastic force.

  According to the fifth aspect of the present invention, the constant load spring can be easily attached to the working plate, the working plate is directly operated by the constant load spring to give a resilient force around the rotation axis, and at the opening operation, the specified flow rate It is possible to reliably rotate the check valve body up to the valve angle necessary for detecting this.

It is a perspective view which shows embodiment of the flowing water detection apparatus in this invention. It is a top view of FIG. It is a front view of FIG. (A) is sectional drawing which shows the fully closed state of a flowing water detection apparatus. (B) is a schematic diagram showing the inside of the switch mechanism when fully closed. (C) is a perspective view which shows a locking member. (A) is sectional drawing which shows the micro-open state of a flowing water detection apparatus. (B) is a schematic diagram which shows the inside of the switch mechanism at the time of a fine opening. (A) is sectional drawing which shows the intermediate opening degree state of a flowing water detection apparatus. (B) is a schematic diagram which shows the inside of the switch mechanism at the time of intermediate opening. (A) is sectional drawing which shows the full open state of a flowing water detection apparatus. (B) is a schematic diagram which shows the inside of the switch mechanism at the time of a full open. It is a schematic diagram which shows a sprinkler system. It is a schematic diagram which shows the switch mechanism of other embodiment of the flowing water detection apparatus in this invention.

  Below, the flowing water detection apparatus in this invention is demonstrated in detail based on embodiment. 1 to 3 show an embodiment of a flowing water detection device according to the present invention. This flowing water detection device has a body 1, and a disc-shaped check valve body 2 is provided inside the body 1. It has been. A switch mechanism 3, primary and secondary pressure gauges 4, and a discharge valve mechanism 5 are disposed outside the body 1.

  The body 1 is formed in a short cylindrical shape. On the outer peripheral surface 1 a of the body 1, a mounting base 10 for mounting the switch mechanism 3, a base 11 for mounting the pressure gauge 4, and a discharge base for mounting the discharge valve mechanism 5. An outlet portion 12 is provided. The mounting base 10 is provided on the front end side of a plurality of projecting portions formed in the body 1, and mounting holes 16 are formed in the base 11 so as to communicate with the primary side and the secondary side of the check valve body 2, respectively. The discharge port portion 12 is formed so as to communicate with the outside from the secondary side of the check valve body 2.

  As shown in FIGS. 4 to 7, the check valve body 2 has a rotating shaft 17 provided at one end, and is provided rotatably around the body 1 via an arm 18 around the rotating shaft 17. The flow rate in the body 1 is opened and closed. A stopper (contact portion) 19 is formed on the back side of the arm 18, and when the check valve body 2 of FIG. 7 is fully opened, the contact portion 19 contacts the opposite surface of the body 1, thereby Even when the amount of water flowing from the side is large, the check valve body 2 is not rattled and the fully open state is maintained.

  A spring member 20 to be described later is attached to the rotating shaft 17 to support the opening operation of the check valve body 2, and it is necessary for detecting the specified flow rate by applying the elastic force of the spring member 20 to the rotating shaft 17. The valve opening of the check valve body 2 is obtained.

  Further, the check valve body 2 is provided with a sealing O-ring 22 that seals between the valve seat surface 21 formed on the body 1, and the guide body 23 is connected to the check valve body via the O-ring 22. 2 is provided at the center. When the valve is closed, the check valve body 2 and the valve seat surface 21 are sealed by the O-ring 22 and the valve is closed.

  The guide body 23 is provided with a tapered outer peripheral portion formed in an inclined shape, and a central portion is fixed to the check valve body 2 by a bolt 24. After the guide body 23 is attached, the flow path on the valve seat surface 21 side when the valve is closed is narrowed, and the fluid pressure in the vicinity of the valve seat surface 21 is increased when water flows, so that the check valve body 2 is easily opened. The guide body 23 detects the rotation angle of the check valve body 2 as a trigger, amplifies the operation angle while preventing the malfunction, and reliably detects the flowing water when the sprinkler is activated.

The check valve body 2 is connected to the switch mechanism 3 via the rotating shaft 17, and the rotation mechanism of the check valve body 2 is detected by the switch mechanism 3.
1 to 7, the switch mechanism 3 is housed in a rectangular parallelepiped case body 30 and attached to the mounting base 10 in this state. Inside the case body 30 are provided operating plates 31, 32, a rotary damper 33, a limit switch 34 having a contact 35, a weight 36, a spring member 20, a screw 37 serving as a locking portion, and a plate 38. The delaying operation of the check valve body 2 is delayed via these, and the malfunction of the check valve body 2 and the internal pressure of the check valve body 2 is prevented while preventing malfunction due to fluid fluctuations. It is possible to detect running water due to rotation.

  The operation plates 31 and 32 are respectively composed of a first operation plate and a second operation plate. The first actuating plate 31 is coaxially attached to the rotating shaft 17 and is provided so that the free end side can be rotated and the flowing water can be detected by the rotation of the check valve body 2. The second operating plate 32 is bent into a substantially V shape and is provided with a bent portion 32a, and is fixed coaxially with the rotary damper 33 in the vicinity of the bent portion 32a. The bending angle α at the bent portion 32a is set to about 155 °, for example. The second working plate 32 is provided with one end portion engageable with the free end side of the first working plate 31, and provided with a weight 36 in the vicinity of the other end portion. When the engagement with the free end side of the first operation plate 31 is released, the second operation plate 32 is rotated by the weight 36 via the rotary damper 33 and the contact 35 of the limit switch 34 is turned on. .

  The second working plate 32 is arranged in a substantially square shape at a predetermined angle with the longitudinal direction of the first working plate 31, whereby the first working plate 31 is attached to the side of the weight 36 of the second working plate 32 from the rotating shaft 17 mounting side. The short length in the width direction to the end is shortened. In FIG. 4B, the substantially β-shaped angle β is set to about 130 °, for example. Further, the rotation angle θ from the state when the valve of the second operation plate 32 is closed to the state where the contact 35 is pressed is 21 ° in the present embodiment, but these angles θ, α, and β are appropriately changed. Is possible.

  The rotary damper 33 is fixed in the case body 30, and the load in the rotation direction (the right rotation direction in FIG. 4B) when the second operation plate 32 tries to turn on the limit switch 34 during water flow is limited. The load is larger than the load in the rotation direction for turning off the switch 34 (left rotation direction in the figure).

  The limit switch 34 is fixed to the case body 30 similarly to the rotary damper 33, and is provided at the position of the end portion of the second operating plate 32 on the weight 36 side. When the check valve body 2 rotates by a predetermined angle in the valve opening direction and the second operation plate 32 rotates by the weight 36, the end portion on the side of the weight 36 can turn on the contact 35 of the limit switch 34. ing.

  On the rotating shaft 17 side of the switch mechanism 3, the first operating plate 31, the second operating plate 32, the rotary damper 33, the limit switch 34, and the weight 36 are provided, and the non-rotating shaft side, that is, the pressure gauge 4 and the discharge are provided. On the side of the handle 39 provided in the valve mechanism 5, there is provided a terminal unit 40 to which an electric cable (not shown) used for power supply and detection signals can be connected. Thereby, an operator heading to an installation surface such as a ceiling surface or a wall surface can smoothly connect an electric cable, check the pressure gauge 4, operate the discharge valve mechanism 5, and the like.

  4 to 7, the spring member 20 is a torsion coil spring and is provided around the rotation shaft 17 of the check valve body 2 inside the switch mechanism 3. The torsion coil spring 20 has a resilient force in the valve opening direction of the check valve body 2 and is mounted so as to accumulate the resilient force in the valve opening direction due to its own weight in the valve closed state of the check valve body 2. ing.

Specifically, one end of the torsion coil spring 20 is locked to a screw 37 provided as a locking portion inside the switch mechanism 3, and the other end is locked to a plate 38 attached coaxially to the rotary shaft 17. Thus, a resilient force F ₁ in the valve opening direction is applied around the rotation shaft 17.
With this torsion coil spring 20, the check valve body 2 rotates by a predetermined angle or more in the opening direction at the time of flowing the specified flow rate or more, and the check valve body 2 can be detected by the switch mechanism 3.

The torsion coil spring 20 is held in a substantially “T” shape as shown in FIG. 4B in a state where the elastic force is accumulated, and is disposed below the first operating plate 31. be able to.
Therefore, unlike the prior art, it is not necessary to arrange the spring member in the direction in which the operating piece (lever) rotates counterclockwise when the check valve is opened, so that the switch mechanism 3 has a compact structure. It can be.

In the switch mechanism 3, the locking member 42 shown in FIG. 4C may be provided as a separate part from the first operating plate 31, and the locking member 42 may be used. The locking member 42 has a locking piece 43 that can be locked to the other end side of the torsion coil spring 20, and the rotary shaft 17 so that the locking member 42 operates integrally with the first operating plate 31. If the locking piece 43 is locked to the other end side of the torsion coil spring 20, the elastic force F is applied to the torsion coil spring 20 in the same manner as described above. ₁ is given.

In this case, it is better to increase the flow velocity received by the check valve body 2 by reducing the radial gap between the check valve body 2 and the valve seat surface 21 (tube wall) on the secondary side of the valve body. This will be described later, it is possible to increase the force F ₂ applied from the fluid, can be increased opening angle of the check valve body 2.

  With the structure described above, when the rotation of the check valve body 2 is transmitted to the first operating plate 31 via the rotating shaft 17, the rotation is transmitted from the first operating plate 31 to the second operating plate 32, Flowing water is detected through the switch mechanism 3 which is a working valve type delay mechanism.

  As shown in FIG. 1, the pressure gauges 4, 4 are attached to the pedestal 11 through the attachment holes 16, and the pressure gauges 4, 4 respectively control the pressure on the primary side and the secondary side of the check valve body 2. Measurement is possible. By this pressure measurement, it is possible to confirm the load condition of a predetermined water pressure on both the primary and secondary sides necessary for water discharge of the sprinkler, fluid leakage during maintenance, and the like. The pressure gauge 4 may be provided with a pressure cutoff valve 41 as shown in FIG. 4. In this case, when filling the body 1 or the pipe to which the body 1 is attached with water, the pressure cutoff valve 41 is provided. If 41 is closed, the pressure gauge 4 can be prevented from being damaged by a rapid pressure increase. When the pressure gauge 4 is replaced or maintained, these operations can be facilitated by closing the pressure shut-off valve 41.

  The discharge valve mechanism 5 shown in FIG. 1 is attached to the drain port portion 12, and the water accumulated in the body 1 and the pipe can be discharged through the discharge valve mechanism 5 during maintenance or the like. The drain port 12 is provided on the body side surface on the secondary side of the check valve body 2, and an appropriate valve can be used as the drain valve mechanism 5 as long as the drain port 12 can be opened and closed. The water accumulated in the flowing water detection mechanism and the secondary side of the pipe can be discharged by the rotation of.

  When using the flowing water detection apparatus mentioned above for a sprinkler system, it becomes a pipe line shown in FIG. 8, for example. The sprinkler system 50 is provided with a sprinkler head 51 and a terminal test valve 52 on the secondary side of the flowing water detection device, and a valve 53, a feed pump 54, a water tank 55, and an auxiliary pressurization on the primary side of the flowing water detection device. A unit (intermediate pump) 56 is provided.

  When a fire occurs in the equipment provided with the sprinkler system 50, the sprinkler head 51 is bounced and water is injected. Along with this, the water pressure on the secondary side (sprinkler nozzle side) of the flow rate detection device decreases, so the check valve body 2 of the flow rate detection device opens due to the differential pressure, and the fluid on the primary side (feed water pump 54 side) Flows to the next side.

  When running water for more than the delay time continues, a signal is emitted from the switch mechanism 3 of the running water detection device. This signal activates the alarm and sprinkler system 50, and water is injected from the sprinkler head 51 in earnest by the water supply pump 54.

The operation of the flowing water detection device at this time is as follows.
FIG. 4 (a) shows a normal state (non-flowing water) state of the flowing water detection device. Water is filled in the primary and secondary sides of the flowing water detection device, and the check valve body 2 is connected to the check valve body 2 by the O-ring 22. The valve is closed with the valve seat surface 21 sealed.

In the valve closed state, the self-weight W of the check valve body 2, the relationship between the elastic force F _1a of the torsion coil spring 20, in the vector diagram of FIG. 4 (a), expressed as its weight W ≧ spring force F _1a be able to. Due to this relationship, the elastic force F _1a of the torsion coil spring 20 in the valve closed state is accumulated.

Here, since the force F ₂ received by the check valve body 2 by the fluid is 0 (zero), the illustration is omitted. Further, the check valve body 2 receives buoyancy by the fluid from the primary side, but this buoyancy is a constant determined by the volume of the check valve body 2 and does not vary with the opening of the check valve. Therefore, the description is omitted.

  FIG. 4B shows the state of the switch mechanism 3 in the valve closed state. The rotary damper 33 is applied with a force to rotate to the right by the weight 36, but the valve closed state is maintained as described above, and the rotary shaft 17 does not rotate. The engaged state of the operation plate 31 is maintained. Therefore, the rotary damper 33 does not rotate right in the figure, and the limit switch 34 does not operate.

  FIG. 5 (a) shows that an instantaneous pressure fluctuation or water leakage occurs due to a test or the like of another flowing water detection device provided in the pipe, and the intermediate pump 56 is operated to be 20 L / min or less, for example, 5 to 10 L / min. A minute flow rate of water flows, and the check valve is slightly opened (opening degree 10 ° or less).

In this slightly open state, the self-weight W of the check valve body 2, the elastic force F _1b of the torsion coil spring _20, the relationship between the force F _2b of the check valve body 2 is subjected by the fluid is a vector diagram of FIGS. 5 (a) , It can be expressed as own weight W ≧ elastic force F _1b + force F _2b . That is, by setting the elastic force _F1b of the torsion coil spring 20 so as to satisfy the above relationship, the check valve is not opened greatly by the torsion coil spring 20, and the check valve is kept in a slightly open state. Is done.
The elastic force F _1b of the torsion coil spring is substantially the same or slightly smaller than the elastic force F _1a of the torsion coil spring 20 in FIG. 4 (elastic force F _1b ≦ elastic force F). _1a ).

Here, the relationship of own weight W = elastic force F _1b + force F _2b indicates that the check valve body 2 is held at the opening shown in FIG.
Further, if the relationship of own weight W> elastic force F _1b + force F _2b is satisfied, the opening of the check valve decreases, and the valve may be closed, but it is not necessary to detect running water. There is no change, and there is no problem in using the water flow detector.

  The state of the switch mechanism 3 in the slightly opened state is shown in FIG. The rotary damper 33 is continuously applied with a force to rotate right by the weight 36. However, since the rotation angle of the rotary shaft 17 is very small, the engagement state of the first operation plate 31 by the second operation plate 32 is maintained. Is done. Accordingly, the rotary damper 33 does not rotate clockwise and the limit switch 34 does not operate. This prevents a flowing water detection signal from being transmitted at a minute flow rate.

  FIG. 6 (a) shows that a fire has occurred in a building where the water flow detection device is installed, the sprinkler head 51 is bounced and water is injected, the water pressure on the secondary side of the water flow detection device is lowered, and the check valve is It shows a state where water is opened by the differential pressure and water exceeding 20 L / min flows. Specifically, FIG. 6A shows a state where 50 L / min, which is a specified flow rate, flows and the check valve has an intermediate opening (opening: about 12 to 13 °).

In this intermediate opening, the own weight W of the valve body, the elastic force F _1c of the torsion coil spring _20, the relationship of F _2c of the check valve body 2 is subjected by the fluid is the vector diagram of FIG. 6 (a), the own weight W ≦ Resilient force F _1c + F _2c That is, by setting the elastic force F _1c of the torsion coil spring 20 so as to satisfy the above relationship, the valve opening degree of the check valve at the specified flow rate is used by using the elastic force F _1c of the torsion coil spring 20. The flowing water detection in the switch mechanism 3 can be reliably performed.
The elastic force F _1c of the torsion coil spring 20 is slightly smaller than the elastic force F _1b of the torsion coil spring 20 in FIG. 5 (elastic force F _1c ≦ elastic force F _1b ).

Here, the relationship of self-weight W = repulsive force F _1c + force F _2c indicates that the check valve body 2 is held at the opening shown in FIG.
Further, if the relationship of self-weight W <elastic force F _1c + force F _2c is satisfied, the opening of the check valve becomes large and may be fully opened, but it is in a state of detecting flowing water. There is no problem in using the water flow detector.

The state of the switch mechanism 3 in the intermediate opening state is shown in FIG.
In this case, the first working plate 31 that is mounted coaxially with the check valve body 2 via the rotary shaft 17 rotates at the same angle as the rotation angle of the check valve body 2, and the free end of the first working plate 31 The side engagement is disengaged from the second actuation plate 32. For this reason, the 2nd action | operation plate 32 rotates right from the state of a figure with the weight of the weight 36. FIG. As described above, since the load in the clockwise direction of the rotary damper 33 is larger than the load in the counterclockwise direction, the second operation plate 32 gradually rotates to the right so as to resist the load of the rotary damper 33 and performs the first operation. After a predetermined time elapses after the plate 31 is disengaged, the second operating plate 32 pushes the contact 35 of the limit switch 34 and the limit switch 34 is turned on.

The delay time from when the check valve body 2 is fully opened and the first operating plate 31 is disengaged from the second operating plate 32 to when the limit switch 34 is turned on by the second operating plate 32 is the rotary damper. It can be set as appropriate by adjusting the size of the load 33 and the position and weight of the weight 36 relative to the second operating plate 32.
When the limit switch 34 is turned on, a signal is issued to inform an external control panel (not shown) that the check valve body 2 has been opened for a predetermined time. This signal activates an alarm device (not shown) to notify the operation of the sprinkler system 50 due to the occurrence of a fire.

  On the other hand, even when water having a flow rate of 50 L / min or more flows in the flowing water detection device and the first working plate 31 is pushed up to the state of FIG. 6A by the water pressure, this state remains for a certain time (for example, 20 seconds). ) If not maintained, the check valve body 2 rotates to the closed state at the same time as the flowing water stops, and the second operating plate 32 is lifted against the weight of the weight 36 by the engagement of the first operating plate 31. . Thereby, the limit switch 34 is not turned on, and malfunction can be prevented according to a preset time.

  FIG. 7A shows a state in which the limit switch 34 is turned on as described above, the fire alarm and the water supply pump 54 are activated, and water is jetted from the sprinkler head 51 in earnest. Specifically, FIG. 7A shows a state in which a fluid exceeding 50 L / min flows and the check valve is fully opened.

In this valve closed state, the relationship between the self-weight W of the check valve body 2, the elastic force F _1d of the torsion coil spring 20, and the force F _2d received by the check valve body 20 by the fluid is similar to the case of FIG. In the vector diagram of FIG. 7A, it can be expressed as self-weight W ≦ elastic force F _1d + force F _2d . The elastic force F _1d of the torsion coil spring 20 is a smaller value than the elastic force F _1c of the torsion coil spring 20 in FIG. 6 (elastic force F _1d ≦ elastic force F _1c ). Since the force F _2d received by the check valve body 2 by the fluid is further increased, the check valve is fully opened.

Here, the relationship of self-weight W = repulsive force F _1d + force F _2d indicates that the check valve body 2 is held in the fully open state shown in FIG.
Further, if the relationship of self-weight W <elastic force F _1d + force F _2d is satisfied, the opening degree of the check valve remains in the fully open state shown in FIG. It will be in the state pressed against the body 1.

  The state of the switch mechanism 4 in the intermediate opening state is shown in FIG. The rotating shaft 17 further rotates, and the state where the engagement of the first operating plate 31 by the second operating plate 32 is released continues. Thereby, the state where the 1st operation plate 31 rotated right is also maintained, and the state where limit switch 34 was turned on is also maintained.

  When the water supply pump 54 is stopped due to a fire extinguishing or the like and the water flow to the sprinkler head 51 is stopped, water accumulates on the secondary side of the water flow detection device, and the difference between the primary side and the secondary side of the check valve body 2 The pressure disappears, the check valve body 2 rotates by its own weight, and the valve is closed as shown in FIG. At this time, the first working plate 31 is rotated to the state shown in FIG. 4B, and the end side of the first working plate 31 is engaged with the bent portion 32a of the second working plate 32 so that the second working plate 32 is engaged. Is turned counterclockwise, and the second operating plate 32 is disengaged from the contact point 35 of the limit switch 34 to be turned off. Thereby, the signal to the control panel stops and the operation of the alarm device stops.

  In addition, when discharging the water on the secondary side of the flowing water detection device for maintenance or testing, the manual handle 39 is rotated in the opening direction to open the discharge valve mechanism 5. Thereby, the water accumulated on the secondary side of the flowing water detection device is discharged from the discharge port portion 12 to the outside.

Next, the effect | action in the said embodiment of the flowing water detection apparatus of this invention is demonstrated.
In the flowing water detection device of the present invention, as described above, the torsion coil spring 20 that is a spring member that supports the opening operation of the check valve body 2 is attached to the rotating shaft 17, and the elastic force of the torsion coil spring 20 is applied to the rotating shaft. 17 to obtain the valve opening degree of the check valve body 2 necessary for detecting the specified flow rate, so that a large weight is reversed without providing a separate detection shaft or the like even in the case of a large diameter. The opening operation of the valve body 2 is supported by the torsion coil spring 20 and is reliably rotated to a predetermined angle, and a valve opening sufficient for detection can be obtained at a specified flow rate.

  In this case, the torsion coil spring 20 is provided in the switch mechanism 3 around the rotation shaft 17 of the check valve body 2 so that the torsion coil spring 20 is not always exposed to fluid and is caused by rust such as corrosion. There is no risk of malfunction. Since the torsion coil spring 20 can be inserted into the rotating shaft 17 and disposed at a predetermined position, the internal structure inside the switch mechanism 3 is simplified, and space saving is also possible.

  Further, since the torsion coil spring 20 is provided coaxially with the rotary shaft 17, the check valve body 2 is not hindered from rotating, and the check valve body 2 is transmitted to the check valve body 2 even when the check valve body 2 is fully opened. The valve body 2 is held in a fully opened position in a stable state, thereby preventing vibration of the check valve body 2 when fully opened, thereby suppressing fluttering and preventing noise. Moreover, if the state where the torsion coil spring 20 is opened to the maximum is set so as to coincide with the fully opened state of the check valve body 2, the check valve body 2 will not receive an excessive elastic force exceeding the fully opened state, It is also possible to prevent an impact when the valve is fully open. By adjusting the elastic force of the torsion coil spring 20 in advance, the operating angle of the valve element can be adjusted with respect to the minimum operating flow rate other than 50 L / min.

In FIG. 9, the switch mechanism in other embodiment of the flowing water detection apparatus in this invention is shown. In addition, in this embodiment, the same part as the said embodiment is represented by the same code | symbol, and the description is abbreviate | omitted.
In the switch mechanism 3 of this flowing water detection device, a constant load spring 70 is provided on the rotating shaft 17 of the check valve body 2 in FIG. 4 as a spring member. The constant load spring 70 has an elastic force in the valve opening direction, which is the winding direction of the check valve body 2, and the elastic force in the valve opening direction is accumulated by the self-weight of the check valve body 2 in the valve closed state. It has come to be.

  As shown in FIG. 9A, the end portion 71 of the constant load spring 70 is attached to the attachment end portion 73 of the first operation plate 72, which is an operation plate formed in a substantially L shape. The operation plate 72 is coaxially attached to the rotary shaft 17 so as to give a resilient force around the rotary shaft 17. The first operation plate 72 is provided with an engagement end portion 74 at an angle of approximately 90 ° with the attachment end portion 73, and the engagement end portion 74 can be engaged with the second operation plate 32.

  When the valve shown in FIG. 9A is closed, the elastic force in the valve opening direction is accumulated in the constant load spring 70 via the first operating plate 71 due to the weight of the check valve body 2 in the valve closed state. At this time, the engagement end portion 74 of the first operation plate 71 is engaged with the bent portion 32 a of the second operation plate 32. When the valve is opened, the state shown in FIG. 9B is obtained, the engagement end 74 is disengaged from the second operation plate 32, and a force to rotate the rotary damper 33 to the right by the weight 36 is applied. The limit switch 34 can be turned on by the plate 32.

  As described above, when the spring member is the constant load spring 70, a constant load force can be applied in the direction in which the check valve body 2 is pushed up. Therefore, at any opening from the valve closed to the valve open state. A stable valve opening is obtained. In addition to the constant load spring, it is possible to use a compression coil spring, a tension coil spring, etc. (not shown) as the spring member. The same function as a torsion coil spring or a constant load spring can be exhibited.

1 Body 2 Check Valve 3 Switch Mechanism 17 Rotating Shaft 20 Torsion Coil Spring (Spring Member)
31, 72 First working plate (working plate)
37 Screw (locking part)
70 Constant load spring 71 End

Claims (5)

A check valve body is rotatably provided via a rotating shaft provided at one end of a disc-like check valve body provided in the body, and a switch mechanism for detecting the turning operation of the check valve body is provided on the body. A spring member that is housed in a case body provided outside and is mounted on the rotating shaft is disposed inside the case body, and the spring member has a resilient force in the valve opening direction of the check valve body. The check valve body is a member that accumulates the resilient force in the valve opening direction due to its own weight, and is required for detecting the specified flow rate by applying the resilient force of the spring member to the rotating shaft. A flowing water detection device characterized in that the valve opening degree is obtained. The spring member, the water flow detection device according to 請 Motomeko 1 Ru coil Banedea torsion provided around the rotation axis of the check valve body.   The torsion coil spring has one end engaged with an engaging portion provided on the switch mechanism and the other end engaged with an engaging portion provided on an operation plate attached coaxially to the rotating shaft. The flowing water detection device according to claim 2, wherein a resilient force is imparted to the water. The spring member, the water flow detection device according to 請 Motomeko 1 Ah Ru with constant force spring which is provided to the rotation axis of the check valve body.   The flowing water detection device according to claim 4, wherein the constant load spring is provided with an elastic force around the rotation shaft by attaching an end portion to an operation plate that is coaxially mounted on the rotation shaft.

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