JPH04319369A - Non-pressure liquid level monitor device for sprinkler fire extinguishing facility - Google Patents

Abstract

PURPOSE:To accurately detect the abnormality of a secondary side piping system such as leakage, and enable an alarm to be generated by monitoring the liquid level of a fire extinguishing fluid in the secondary side piping system filled with the fluid at a non-pressure level, while monitoring a flame. CONSTITUTION:A vigilance zone is provided with a flame detection means 1, a closed type sprinkler head 4, and a relief valve 6 to keep normally closed state between a primary side 8 and a secondary side 7 and to be opened, upon detecting a flame phenomenon with the flame detection means 1. In addition, the primary side piping of the valve 6 is connected to a fire extinguishing fluid feed means 13, while the secondary side piping 5 thereof is connected to the sprinkler head 4. Furthermore, a pressure regulating device R is provided for reducing and adjusting the pressure of the secondary side 7 to the predetermined level on the basis of the pressure of the primary side 8, when the valve 5 is opened. Also, an opening means A to cause the secondary side piping system to have a non-pressure level is provided at the upstream side of the secondary side piping system of another relief valve 6. A sprinkler fire extinguishing facility so constructed, is fitted with an electrode Q to detect a liquid level at a position equal to or below the predetermined level from the position of the open section 43 of the opening means A.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressureless water level monitoring device for sprinkler fire extinguishing equipment.

0002

2. Description of the Related Art Various types of sprinkler fire extinguishing equipment have been used, including open type, closed type wet type, and dry type. In closed sprinkler fire extinguishing equipment, pressurized fire extinguishing fluid is always filled up to the end of the closed sprinkler head installed in each warning area, and water can be sprayed at the same time as a fire is detected. This is equipment used in buildings, etc. This closed-type sprinkler fire extinguishing system is characterized by the fact that it is constantly filled with pressurized extinguishing fluid up to the end of the piping, so it is possible to release the extinguishing fluid at the same time as the sprinkler head operates when a fire is detected. . However, if the sprinkler head opens due to an accident such as being hit by an object, pressurized fire extinguishing fluid will be released and the pressurized fluid delivery system will start to confirm that there is no fire and then stop the pump. Until then, water continues to be sprinkled, leading to serious water damage. To deal with this, a fire detector is installed in addition to the sprinkler head, and when the fire detector is activated by a fire, the fire extinguishing liquid is filled up to the sprinkler head, and water is sprayed when the sprinkler head is activated. (Formula) There is a sprinkler fire extinguishing system. In this pre-activation type, the air is slightly pressurized in the pipe to the sprinkler head, and when the fire detector detects a fire and the closed sprinkler head is activated, the fire detector and the sprinkler head are activated. Fire extinguishing fluid is released only under the AND condition, and the pipes are normally filled with pressurized air, so even if a closed sprinkler head opens due to an impact, there will be no water damage. It has the characteristic of not causing any accidents. However, this pre-acting sprinkler fire extinguishing equipment requires a compressor, etc. to pressurize the secondary piping to which the closed sprinkler head is connected, making the entire equipment complex and expensive. Even if it operates, pressurized air will initially come out, so
There is a problem that there is a delay before the fire extinguishing fluid starts discharging normally, and in addition, with these conventional fire extinguishing equipment, when extinguishing a fire, the secondary piping system where the sprinkler head is installed has a release valve on the primary side. Because high liquid pressure equivalent to that of the primary side is applied, the secondary piping, sprinkler heads, valves, and other components of the secondary piping system must be of the same pressure resistance grade as the primary side. For this reason, the cost of equipment components is high, which is one of the factors preventing the widespread use of sprinkler fire extinguishing equipment.

[0003] Therefore, in order to solve the various problems of conventional sprinkler fire extinguishing equipment, the applicant of the present application has developed a system in which the secondary side piping system of the open valve is filled with unpressurized extinguishing liquid during fire monitoring. In addition, when the head is opened, the primary pressure is reduced to a predetermined pressure and low-pressure extinguishing fluid is discharged, improving firefighting efficiency and reducing the pressure resistance of equipment components in the secondary piping system. Sprinkler fire extinguishing equipment with a lower grade has been proposed in Japanese Patent Application Nos. 2-411267 and 3-10383.

0004

[Problems to be Solved by the Invention] In the conventional pre-actuation type, for example, the secondary side piping of the pre-actuation valve is filled with pressurized air, and by monitoring the air pressure in the secondary side piping, it is possible to Abnormalities such as sprinkler head leaks can be reported. However, in the case of the previously proposed fire extinguishing equipment in which the secondary piping system of the open valve is filled with unpressurized extinguishing liquid, it is impossible to monitor the pressure of the unpressurized extinguishing liquid, and leaks occur in the secondary piping system. etc. cannot be announced. Therefore, it is inconvenient to maintain the fire extinguishing equipment.

[0005] The present invention was proposed in order to solve the problem of the previously proposed sprinkler fire extinguishing equipment. By monitoring the liquid level, it is intended to accurately detect and notify abnormalities such as leaks in the second side piping system.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a fire detection means 1, a closed type sprinkler head 4, and a primary side 8 and a secondary side 7 in a normally closed state. and a release valve 6 which is opened when the fire detection means 1 detects a fire phenomenon, and the release valve 6 is opened.
The primary side piping is connected to the fire extinguishing liquid supply means 13, the secondary side piping 5 is connected to the closed type sprinkler head 4, and the release valve 6 is connected to the pressure on the primary side 8 when the release valve 6 is opened. It has a pressure regulator R that can reduce and adjust the pressure on the secondary side 7 to a predetermined pressure, and is installed above the secondary side piping system of the release valve 6 to expose it to the atmosphere in order to make the secondary side piping system unpressurized. In a sprinkler fire extinguishing equipment provided with a communicating opening means A, an electrode Q for monitoring water loss is arranged to detect a liquid level below a predetermined position lower than the position of the opening 43 in the opening means A.

[0007] The structure is such that a full-water monitoring electrode P for detecting the liquid level near the position of the opening 43 in the opening means A is arranged.

[0008]

[Operation] When the release valve 6 is closed, the secondary piping system up to the sprinkler head 4 is opened to the atmosphere via the opening means A, so the secondary piping system is filled with unpressurized extinguishing fluid. liquid. The electrode Q for monitoring water loss, which is placed at a predetermined position lower than the opening 43 of the opening means A, is conductive when the secondary piping system is filled with extinguishing liquid up to the opening 43. are doing. When the water level in the secondary piping system falls below the position of the opening 43 due to liquid leakage or the like, the electrode Q for monitoring water loss loses continuity, and an abnormality such as liquid leakage is thereby detected.

In the pressureless liquid filling operation of the secondary side piping system, when the release valve 6 is gradually opened and the fire extinguishing liquid reaches the position of the opening 43 of the opening means A, the extinguishing liquid is placed near the position of the opening 43. The electrode P for monitoring full water becomes conductive, thereby detecting the completion of filling.

0010

[Embodiments] Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 is a block diagram showing an embodiment of the sprinkler fire extinguishing equipment. A fire detector 1 as a fire detection means such as a differential type or a constant temperature type installed in a warning area is connected to a receiving board 3 via an electric line 2. Similar to the fire detector 1, a closed sprinkler head 4 is installed on the ceiling of the warning area.
is connected to the secondary side 7 of a release valve 6 provided in the guarded area via a secondary side piping 5. The primary side 8 of the open valve 6 is connected to a pressurized liquid supply device 13 as an example of a fire extinguishing liquid supply means, and is connected to a pump 10 and a receiver panel 3 by an electric line 11 via the illustrated gate valve 9. The pressurized liquid feeding device 13 is provided with a motor 12 and, although not shown, a normal check valve, pressurizing means such as a pressurized air tank, and the like. A plurality of branch pipes 53 are connected to the secondary side pipe 5, and each branch pipe 53
A plurality of sprinkler heads 4 are connected to the unwinding pipe 56.
connected via. The illustrated example of the unwinding pipe 56 is shaped such that it rises slightly from the branch pipe 53 and then descends.

The open valve 6 is equipped with a pressure regulating device R that reduces and adjusts the hydraulic pressure on the primary side 8 to a predetermined pressure and supplies it to the secondary side 7. That is, the primary side 8 and the secondary side 7 of the open valve 6 are separated by a valve seat 14 and a valve body 15 that opens and closes this valve seat 14, and the valve seat wall 20 in the valve body 16 and this valve body 15 forms an operation chamber 17, and the valve element 15, which is biased by a spring 18 to close the valve seat 14, has a small hole 19 for introducing a part of the hydraulic pressure on the primary side 8. . A secondary operation chamber 17a is formed by the valve seat wall 20 and a partition wall 21 in the valve box 16, and the secondary operation chamber 17a is connected to the receiver board 3 through an electric line 23, and is connected to an electric motor such as a motor or a solenoid. It communicates with an operating valve 25 that is opened and closed by the section 24 . Control room 17
is provided with a valve body opening adjustment hole 26 that communicates with the secondary operation chamber 17a, and a secondary pressure monitoring chamber 30 is provided in the valve box 16 by a flamm 29 attached to the other end of the needle 27.
is formed, and the secondary pressure monitoring chamber 30 is communicated with the secondary side 7 of the open valve 6 through a pipe 31. The flamm 29 is biased by a secondary pressure setting spring 28 to increase the opening of the valve body opening adjustment hole 26, and the displacement of the needle 27 integrated with the flamm 29 causes the valve body to open. The opening degree of the degree adjustment hole 26 is adjusted, and the hydraulic pressure on the primary side 8 is reduced to a predetermined pressure and supplied to the secondary side 7.

In the piping 32 connected to the secondary side 7, an electric circuit 33 detects the opening of the release valve 6 and notifies the receiving board 3 of this, and the receiving board 3 activates the pressurized liquid feeding device 13. A pressure switch 34 is provided, and a drain pipe 3 is connected via a gate valve 35.
6 is connected to this piping 32 and the secondary side of the operating valve 25. The hydraulic pressure on the primary side 8 of the open valve 6 is detected by a pressure gauge 40, and the hydraulic pressure at the end of the secondary side piping 5 is detected by a pressure gauge 50.

In the embodiment of the present invention, in order to fill the secondary piping system with no pressure, the atmosphere is discharged at a position higher than the arrangement position of the secondary piping system such as the secondary piping 5 and the sprinkler head 4. An opening means A is provided which opens with a small opening area. In the illustrated example, the opening means A is a T-joint-shaped cylinder 42 (connected sideways) that connects the riser pipe 41 forming the inlet side of the secondary pipe 5 and the secondary pipe 5. ) and a small hole 43 (formed above the connection part 5a of the secondary pipe 5 with the cylinder 42), which is an opening provided in the upper part of the cylinder 42. The extinguishing liquid overflowing from the small hole 43 is drained to the drain pipe 36 via a drain pipe 44 connected to the cylinder body 42.

Inside the cylindrical body 42, an electrode P for monitoring full water is placed near the height of the small hole 43, which is the opening.
a predetermined lower position (for example, the connection part 5 of the secondary piping 5)
Electrodes Q for monitoring water loss are arranged at positions slightly lower than a). In the illustrated example, the electrode P for monitoring full water is the upper electrode 45 and the lower electrode 46 is the electrode Q for monitoring water loss.
and one electrode 46 of 47, and the electrode Q for water reduction monitoring is composed of the lower two electrodes 46 and 47,
The electrodes 45 , 46 , 47 are connected to the receiving board 3 via a water level detector 48 and an electric line 49 . When the liquid level in the cylindrical body 42 is at the bottom surface of the small hole 43 as shown by the solid line in FIG. At the position indicated by the dotted line in FIG. 2 (for example, near the connection 5a of the secondary pipe 5), there is no conduction between the electrodes 45 and 46, but there is no conduction between the electrodes 46 and 47 of the electrode Q for monitoring water loss. 2, and when the liquid level is at the position shown by the two-dot chain line in FIG. 2 (for example, at a position lower than the connection part 5a of the secondary pipe 5), there is no conduction between any of the electrodes 45, 46, and 47. These electrodes 45, 45, 47 are positioned as follows.

Next, the operation of the above embodiment will be explained. The secondary piping system, such as the secondary piping 5 and the riser pipe 37, is filled with an unpressurized fire extinguishing liquid. To fill the liquid, first, the pressurized liquid feeding device 13 pressurizes the operation chamber 17 via the primary side 8 of the open valve 6. Next, the gate valve 9 is closed, the operation valve 25 is opened, and the pressure inside the operation chamber 17 is reduced, so that the release valve 6
can be opened. Then, the gate valve 9 is gradually opened, and the extinguishing liquid is slowly allowed to flow into the secondary piping system of the open valve 6. The extinguishing liquid flows from the secondary side 7 of the open valve 6 to the riser pipe 4.
1. It flows from the secondary pipe 5, the branch pipe 53, and the unwinding pipe 56 to the sprinkler head 4, passes through the small hole 43 of the cylinder body 42 from the riser pipe 41, and flows down from the drain pipe 44 to the drain pipe 39. When the extinguishing liquid exceeds the small hole 43 of the cylinder body 42, conduction occurs between the electrodes 45 and 46 of the electrode P for monitoring full water level, and a notification is sent from the water level detector 48 to the receiving panel 3. Based on this, the release valve 6 is activated. be closed manually or automatically.

As a result, the pressure fluid acting on the secondary piping system is discharged to the drain pipe 39 through the small hole 43, and the secondary piping system is filled with liquid without pressure. In this way, the secondary side piping 5, sprinkler head 4, etc. are filled with liquid, and by using the small holes 43 in the opening means A to keep the proportion of communication with the atmosphere small, diffusion of the extinguishing liquid into the atmosphere is suppressed. , it is possible to maintain a non-pressure filled state for a long period of time. Under normal conditions, when the fire detector 1 is not operating, the extinguishing liquid in the primary side 8 of the open valve 6 in each warning area enters the operation room 17 through the small hole 19, and is pushed through the valve body by the liquid pressure of the pressurized liquid supply device 13 and the spring 18. 15 is the valve seat 14
is closed and this fire extinguishing equipment is in a monitored state. Since the secondary piping 5 and the like are filled with extinguishing liquid without pressurization, the loss of extinguishing liquid during monitoring is small. If a liquid leak occurs in the secondary piping system and the liquid level in the secondary piping system drops by a predetermined amount below the position of the small hole 43, the lower electrode 46, which is the electrode Q for monitoring water loss, 47, and the water level detector 48 notifies the receiving board 3 of a liquid leak. Furthermore, if a large number of electrodes are arranged between the electrodes 46, 47 and the electrode 45 in the same manner as described above, changes in the water level can be detected in stages. This liquid leak alarm allows repairs to be made without delay, making it convenient for maintenance of fire extinguishing equipment.

[0017] In the above-mentioned no-pressure water level monitoring device, the secondary piping system (with a volume of about 100 to 200 liters) Care must be taken to ensure that false alarms such as liquid leakage are not issued due to changes in volume within the tank. For example, consider a case where the indoor temperature fluctuates by 20°C, the volume of the secondary pipe 5 is 200 liters, the expansion coefficient of water is 0.00021, and the expansion coefficient of air is 0.000367.
shall be. (1) When the secondary side piping 5 is completely filled with water and no air remains. The volume change of water is 0.00021×20×
200=0.84 liters (2) When 20 liters of air remains in the secondary pipe 5. The volume change of water is 0.00021×20×18
The change in volume of 0=0.76 liters of air is 0.000367×20×20≒1
．． 47 liters, total volume change (secondary side piping 5
The change in volume within) is 0.76+1.47=2.23 liters. (3) Therefore, there is a possibility that a water level change corresponding to 2.23 liters, which is the maximum value of the above-mentioned volume change, will occur within the cylindrical body 42 of the opening means A. It is necessary to take measures to prevent alarms such as liquid leakage from being issued in response to changes in water level due to such fluctuations in environmental temperature. In order to make this volume change of about 2.23 liters into a slight water level change within the cylinder 42, the cross-sectional area of the cylinder 42 must be set sufficiently large, the lower electrode 46 which is the electrode Q for monitoring water loss, This problem can be solved by setting the height position of 47 slightly above the connection part 5a of the secondary pipe 5.

The illustrated example of the unwinding pipe 56 is shaped such that it rises up a little from the branch pipe 53 and then goes down, so that all the air in the secondary pipe 5 is discharged from the drain pipe 39 during filling. The liquid is collected at the top of the unwinding tube 56. Therefore, if one sprinkler head 4 is opened due to a mechanical shock such as being hit by an object during the monitoring state, the extinguishing liquid corresponding to the piping capacity of the head from this sprinkler head 4 to the small hole 43 of the cylinder 42 will be released. However, the extinguishing liquid in the unwinding pipes 56 and branch pipes 53 of other sprinkler heads 4 is not subjected to the suction action from the open head 4 due to the air at the top of each unwinding pipe 56. and does not cause release by siphon action. Therefore, the amount of fire extinguishing liquid released is only a very small amount, which corresponds to the pipe capacity of the head of the sprinkler head 4 opened as described above, and water damage caused by mechanical opening of the sprinkler head 4 is negligible. Become.

When a fire occurs and the fire detector 1 is activated in the monitored state where the liquid is filled with no pressure, a fire signal is sent to the receiver panel 3.
transmitted to. In the receiver panel 3, the electric part 24 is operated simultaneously with this fire signal to open the operation valve 25, so the hydraulic pressure in the operation chamber 17 of the open valve 6 is transferred to the drain pipe 3 through the secondary operation chamber 17a.
6 and its hydraulic pressure is reduced, and the release valve 6 is opened by the hydraulic pressure on the primary side 8. On the other hand, the pressure liquid on the primary side 8 flows through the secondary side 7 to the secondary side piping 5 and the piping 32 by means of pressurizing means such as a pressure air tank (not shown), and the pressure switch 34 is activated to open the open valve on the receiver panel 3. Notify the opening of 6.

When the hydraulic pressure on the secondary side 7 exceeds the set pressure of the pressure regulator R, the flamm 29 and needle 27 are pushed to the left, the valve opening adjustment hole 26 is narrowed, and the operation chamber 17 is The drained liquid decreases, and the valve element 15 throttles the valve seat 14 due to the hydraulic pressure on the secondary side 7 and the spring 18. When the fluid pressure on the secondary side 7 falls below the set pressure of the pressure regulator R, the needle 27 is returned by the secondary pressure setting spring 28, the valve body opening adjustment hole 26 is opened, and the pressure fluid in the operation chamber 17 is The liquid is drained through the operation secondary chamber 17a, and the valve body 15 is returned by the liquid pressure on the primary side 8, the valve seat 14 is opened, and the extinguishing liquid on the primary side 8 is introduced into the secondary side 7. The hydraulic pressure is restored,
In this way, the hydraulic pressure on the secondary side 7 is adjusted to be reduced to a predetermined pressure necessary for fire extinguishing activities with respect to the hydraulic pressure of the extinguishing liquid on the primary side 8.

When the temperature at the fire point further increases, the sprinkler head 4 opens and the extinguishing liquid in the pipe 5 is released, and the liquid pressure on the secondary side 7 suddenly decreases, causing the pressure in the pressurized liquid supply device 13 to drop. Based on the rate of decrease in pressurized water from a pressurizing means such as an air tank, the receiving panel 3 determines whether the pressure is reduced due to overflow or liquid leakage from the small hole 43 or from the sprinkler head 4. If the pressure is reduced from 4, the pump 10 of the pressurized liquid feeding device 13 is activated. Note that the activation of the pump 10 of the pressurized liquid feeding device 13 is as follows:
This may be done by detecting the continuous pressurizing time of the pressurizing means. The sprinkler head 4 and the secondary pipe 5 are filled with unpressurized fire extinguishing liquid, and unlike the conventional pre-acting sprinkler fire extinguishing equipment, there is no intervening air, so the sprinkler head 4 is opened at the same time. The extinguishing liquid was released and there was no delay in extinguishing the fire. Further, the opening means A is not limited to the riser pipe 41 as shown in the illustrated example, but may be formed by providing a branch pipe in the middle of the secondary piping 5, for example. Further, in each of the embodiments described above, the pressure regulator R is installed as an additional device to the open valve 6, but the pressure regulator R may be configured separately from the open valve 6, and the structure of the pressure regulator R is also shown in the illustration. In addition, various known materials may be used. In each of the above embodiments, the opening of the release valve 6 is not limited to the one based on the signal from the fire detector 1, but may be performed based on a pressure change due to the opening of the sprinkler head in the secondary side piping 5 of low pressure. Alternatively, the opening operation may be performed using a contact point that detects the opening operation of the sprinkler head, including the case where no pressure is applied.

[0022]

As described above, according to the present invention, liquid leakage occurring in the secondary piping system can be detected by connecting the electrode Q for monitoring water loss provided in the opening means A for pressureless liquid filling. It can be detected easily and accurately depending on the presence or absence of. As a result, in order to reduce liquid leakage and quickly carry out fire extinguishing operations when the open valve is opened, the secondary piping system of the open valve 6 is filled with unpressurized extinguishing liquid during fire monitoring. When the head is opened, the primary pressure is reduced to a predetermined pressure and low-pressure fire extinguishing fluid is discharged, improving fire extinguishing efficiency and making it possible to lower the pressure resistance grade of equipment components in the secondary piping system. It has become very useful for the maintenance of effective sprinkler fire extinguishing equipment.

[0023] Completion of the pressureless liquid filling operation of the secondary piping system is as follows:
The electrode P for monitoring full water level placed near the position of the opening 43 of the opening means A is electrically conductive and can be easily detected, making it convenient to handle the previously proposed fire extinguishing equipment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view showing the main part of FIG. 1;

[Explanation of symbols]

1 Fire detector (
Fire detection means) 4
sprinkler head 5
Secondary side piping 6
Release valve 7
Secondary side 8 Primary side 13 Pressurized liquid feeding device (
Extinguishing liquid supply means) 43
Small holes (opening means A) 45, 46, 47 electrodes

Claims (2)

[Claims] 1. A fire detection means, a closed type sprinkler head, and an open valve whose primary side and secondary side are always closed and opened when a fire phenomenon is detected by the fire detection means, in a warning area. and a primary side pipe of the release valve is connected to a fire extinguishing liquid supply means, a secondary side pipe is connected to a closed type sprinkler head, and the release valve is connected to the pressure on the primary side when the release valve is opened. Based on the above, there is a pressure regulating device that can reduce and adjust the pressure on the secondary side to a predetermined pressure, and the upper part of the secondary side piping system of the release valve is connected to the atmosphere in order to make the secondary side piping system unpressurized. The sprinkler fire extinguishing equipment is equipped with an opening means for opening the opening means, and is characterized in that an electrode for monitoring water loss is arranged to detect a liquid level below a predetermined level lower than the position of the opening in the opening means. No-pressure water level monitoring device. 2. The non-pressure water level monitoring device for sprinkler fire extinguishing equipment according to claim 1, further comprising a full water monitoring electrode for detecting the liquid level in the vicinity of the opening in the opening means.