JP2018121941A - Wet sprinkler system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain water in a secondary-side pipe in a negative pressure state, even when air flows into stored water in the pipe for connecting the secondary-side pipe and a suction pump.SOLUTION: A wet sprinkler system includes: at a suction-direction upstream side of a rising pipe part 60 of a pipe line 42, a negative pressure sensor 52 that detects a negative pressure state in the pipe line 42 as a negative pressure value, when filling water in a secondary-side pipe 40 is maintained in a negative pressure state by sucking the inside of the secondary-side pipe 40 by a suction pump 14 provided in the pipe line 42; and a normally-closed atmosphere introduction valve 54 for introducing atmosphere in the pipe line 42. When the negative pressure value in the pipe line 42 detected by the negative pressure sensor 52 is a prescribed value or more, the wet sprinkler system opens the atmosphere introduction valve 54 to introduce the atmosphere into the pipe line 42. Consequently, the atmosphere is swiftly introduced in the pipe line 42 to reduce the water in the pipe line 42, so that there is no need to pump up the water by the rising pipe part 60, thereby returning the inside of the pipe line 42 into a regulated negative pressure state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an automatic fire extinguishing system such as a building, and more particularly to a wet sprinkler system in which a state where a secondary side pipe is filled with water is a normal state.

  2. Description of the Related Art Conventionally, a sprinkler system in which a fire extinguishing sprinkler head is arranged on a ceiling mainly in large-scale buildings has been widely used. Of these sprinkler heads, for example, the one in which the closed portion is melted by the heat of a fire and water can be jetted by this is called an individually actuated sprinkler head. In the sprinkler system, a valve portion that opens and closes the supply of water to the sprinkler head is provided in a water supply pipe that supplies water from the water supply means to the sprinkler head.

  In this water supply piping, when the side connected to the water supply means from the valve portion is the primary side piping portion and the side connected to the sprinkler head is the secondary side piping portion, not only the primary side piping portion but also the secondary side A sprinkler system of a type in which the piping part is normally filled with water is called a wet sprinkler system. In the wet sprinkler system, water is filled up to the top of the sprinkler head, so that the water jet response in the event of a fire is excellent. However, there is a risk of water damage if the sprinkler head breaks out.

  Therefore, the present inventor has proposed a wet sprinkler system described in Patent Document 1 below. In this wet sprinkler system, a pipe line is connected to the secondary side pipe part, a suction pump is provided in the pipe line, and the inside of the secondary side pipe part is sucked by the suction pump to fill the secondary side pipe part. Maintain the negative water pressure as normal. Thereby, even if a sprinkler head explodes, the water in a secondary side piping part does not leak from a sprinkler head, and it can suppress water loss. In Patent Document 1 below, a fire detection sensor that senses a fire condition earlier than the individually actuated sprinkler head is provided, and the opening and closing of the water supply means and the valve unit is controlled based on a fire signal sent from the sensor. I have to.

Japanese Patent No. 3264939

  By the way, when trying to maintain the water in the secondary side piping part of a wet sprinkler system of a plurality of buildings in a negative pressure state with a single suction pump, for example, a pipe line connecting the secondary side piping part and the suction pump In addition, for example, torii piping may be made. The torii piping has a piping structure in which, for example, a horizontal pulling pipe portion is arranged between a rising piping portion (also referred to as a vertical pipe) and a falling piping portion (vertical pipe), and the whole is shaped like a torii gate. When water is stored in the pipe having such a structure, the stored water is pumped up by the rising pipe portion. At this time, due to the structure of the piping, it is easy for air to flow into the stored water, and when the total head of the rising piping section becomes larger than the head of the suction pump with air flowing into the stored water, the stored water is sucked into the suction pump side. Since this is not possible, the negative pressure state in the pipeline is reduced. And if it becomes so, there exists a possibility that the water in a secondary side piping part cannot be maintained in a negative pressure state during water supply piping.

  The present invention has been made in view of the above problems, and its purpose is to provide water in the secondary side pipe part even when air flows into the stored water in the pipe line connecting the secondary side pipe part and the suction pump. Is to provide a wet sprinkler system capable of maintaining a negative pressure state.

  In order to achieve the above object, the invention described in claim 1 includes a primary side pipe connected to a water supply means, a secondary side pipe connected to an individually-actuated sprinkler head, and the primary side pipe. A valve part for partitioning the secondary side pipe part in a normal state between the secondary side pipe part and constituting a water supply path from the water supply means to the sprinkler head; the primary side pipe part and the secondary side pipe It is connected to the secondary side pipe through a water supply pipe that is normally filled with water in both of the parts and a pipe line, and is filled into the secondary side pipe part by sucking the inside of the secondary side pipe part. In a wet sprinkler system comprising a suction pump that maintains normal water in a negative pressure state, a pipe is formed from the upstream side toward the downstream side in the suction direction by the suction pump. Standing up A pipe part, a negative pressure sensor provided upstream of the rising pipe part in the suction direction, and detecting a negative pressure state in the pipe line as a negative pressure value; and upstream of the rising pipe part in the suction direction An atmospheric introduction valve that is normally closed, and a negative pressure value in the pipeline detected by the negative pressure sensor is set in advance. And a controller that opens the atmosphere introduction valve and introduces the atmosphere into the pipe line when the value is equal to or greater than the specified value.

  In this configuration, the case where the negative pressure value in the pipe line is equal to or greater than a preset specified value means that the vacuum degree in the pipe line is lower than the preset vacuum degree. That is, when the negative pressure state is represented by a negative pressure value, the higher the degree of vacuum, the smaller the negative pressure value, for example, on the number line, so that the negative pressure value representing the negative pressure state is not less than a specified value. The degree of vacuum is lower than a preset degree of vacuum.

  According to this configuration, when water is stored in the pipe line and air flows into the stored water, the negative pressure value in the pipe line increases due to pumping of water at the rising pipe portion and accompanying bubble expansion. When the negative pressure value in the pipe line is equal to or higher than a predetermined value set in advance, the air introduction valve is opened and air is introduced into the pipe line. As a result, the atmosphere is vigorously introduced into the pipe line from the upstream side in the suction direction with respect to the rising pipe part, and water is sucked to the suction pump side through the rising pipe part. If this sucked water is drained, the amount of water in the pipe line is reduced, and there is no need to pump water at the rising pipe part, so that the inside of the pipe line can be returned to a prescribed negative pressure state. Therefore, even when air flows into the stored water in the pipe, it is possible to drain the water and maintain the secondary side piping part in the water supply pipe in a negative pressure state.

  According to a second aspect of the present invention, in the wet sprinkler system according to the first aspect, the control unit opens the atmospheric introduction valve for a predetermined time, and then closes the atmospheric introduction valve. It is characterized by that.

  According to this configuration, after the atmosphere is vigorously introduced into the pipeline, the inside of the pipeline can be quickly closed, so the negative pressure state in the pipeline is unnecessarily small (the negative pressure value is increased). ) And the secondary side piping part in the water supply pipe can be maintained in a negative pressure state.

  According to a third aspect of the present invention, in the wet sprinkler system according to the second aspect, the control unit closes the atmosphere introduction valve and then detects the negative pressure in the pipeline detected by the negative pressure sensor. When the value does not become less than the specified value, the atmosphere introduction valve is opened again.

  According to this configuration, even if the water in the pipeline cannot be sufficiently drained by a single introduction of the atmosphere, the water stored in the pipeline can be gradually drained, thereby It becomes possible to maintain a secondary side piping part in a negative pressure state.

  As described above, according to the present invention, when water is stored in the pipe and air flows into the stored water, the atmosphere is vigorously pushed into the pipe from the upstream side in the suction direction with respect to the rising pipe. In this case, the water sucked to the suction pump side is drained, so that the inside of the pipe line can be returned to the specified negative pressure state, so that the water is stored in the pipe line. Moreover, the secondary side piping part in water supply piping can be maintained in a negative pressure state.

It is a whole lineblock diagram showing one embodiment of the wet sprinkler system of the present invention. It is explanatory drawing of an effect | action of the air introduction valve in the wet sprinkler system of FIG.

  In the following embodiments, an apparatus and a method for embodying the present invention are illustrated. However, the technical idea of the present invention does not specify the material, shape, arrangement, etc. of the component parts below. The technical idea of the present invention can be modified in various ways within the technical scope of the claims.

  Hereinafter, embodiments of the wet sprinkler system of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall configuration diagram of a wet sprinkler system according to this embodiment. The wet sprinkler system of this embodiment is intended to control the wet sprinkler system of two buildings 10A and 10B with a single water supply means (water pump) 12 and a suction pump 14. For example, water supply by gravity from a tank installed on the rooftop can be used as the water supply means.

  The configuration of the wet sprinkler system in each building 10A, 10B is the same as that of Patent Document 1 described above. A large number of individually-actuated sprinkler heads 16 for injecting water in the event of a fire are provided on the ceiling of each building. The water in the fire extinguishing water tank 18 provided in the basement of the ridge 10A on the left side of the figure is supplied to these sprinkler heads 16 from a water supply pump 12 which is a water supply means. For this reason, a water supply pipe 20 is provided as a water supply path between the water supply pump 12 and each sprinkler head 16. The water supply pipe 20 is branched for each floor from a water supply main pipe 22 penetrating each building 10A, 10B, and the branch pipe 24 is connected to the sprinkler head 16 of each floor. A valve portion 26 composed of an electric valve 28 and an alarm valve 30 is provided for each floor upstream of the branch pipe 24 in the water supply direction.

  In addition, each floor of each building 10A, 10B is provided with a fire detection sensor 34 that senses a fire condition earlier than the individually actuated sprinkler head 16, and a fire signal is detected when each fire detection sensor 34 senses a fire condition. Is output toward the water supply control panel 32. When the water supply control panel 32 receives a fire signal from the fire detection sensor 34, the water supply control panel 32 opens the motor-operated valve 28. Therefore, in the event of a fire, pressurized water is supplied to the sprinkler head 16 side before the individually actuated sprinkler head 16 injects water. A test valve 36 is provided at the end of the branch pipe 24 on each floor in the water supply pipe 20 to allow water to flow through the branch pipe 24 and to inject water into the branch pipe 24.

  In this water supply pipe 20, the upstream side in the water supply direction from the valve part 26 described above, that is, the water supply pump 12 side that is a water supply means is provided on the primary side pipe part 38 and downstream in the water supply direction from the valve part 26, that is, a sprinkler head. The 16th side is set as the secondary side piping part 40. FIG. Since the sprinkler system of this embodiment is a wet sprinkler system, the secondary side piping section 40 is normally filled with water. From this state, when the fire detection sensor 34 detects a fire state, the water supply pump 12 is operated by the water supply control panel 32 and the motor-operated valve 28 is opened, high-pressure water is supplied to the secondary side piping unit 40. The Thereafter, when the individually actuated sprinkler head 16 is actuated, water is quickly ejected from the individually actuated sprinkler head 16. Then, when a predetermined amount of water is supplied for a predetermined time, the alarm valve 30 outputs an alarm signal.

  On the other hand, as described above, in the wet sprinkler system, since the secondary side piping unit 40 is filled with water, a negative pressure state is secured to maintain the charged water in the secondary side piping unit 40 described later in a negative pressure state. When there is no means, water damage occurs when the sprinkler head 16 is overburdened. In addition, the outburst means that the disassembled portion of the sprinkler head 16 is broken due to an external impact or the like. The disassembled portion of the sprinkler head 16 is a part of the closed portion structure that normally closes the water, and when the fusible piece provided in the disassembled portion is melted by heat at the time of fire, it is decomposed and dropped. It is called so. In addition, water loss means damage to household goods and electrical products due to water discharge.

  As this negative pressure state securing means, all secondary side piping sections 40 on each floor of each building are connected to a pipeline 42, and the suction pump 14 is connected to this pipeline 42. The pipe line 42 includes a floor connecting pipe 44 connected to the secondary pipe 40 on each floor of each building, and a down pipe 46 connecting each floor connecting pipe 44 up and down through the buildings 10A and 10B. 1 has a ground connection piping part (some of which also has an underground piping part) 48 for connecting the downward piping part 46 of the right building 10B to the downward piping part 46 of the left building 10A. Moreover, the suction pump 14 is provided above the fire-extinguishing water tank 18 of the ridge 10A on the left side of FIG. By sucking the inside of the secondary side piping part 40 through the pipe line 42 by this suction pump 14, the water filled in the secondary side piping part 40 can be made into a negative pressure state. For this reason, even if the sprinkler head 16 breaks out, the water in the secondary side piping section 40 up to the sprinkler head 16 is sucked by the suction pump 14 through the pipe line 42 and no water loss occurs.

  For example, a vacuum pump (European Patent No. EP1518055) manufactured by Speck Pumpen Vakuumtechnik GmbH of Germany can be applied to the suction pump 14. This vacuum pump is configured to be able to discharge not only gas but also liquid, and is a practical pump that can be used for a long time even under high load conditions in which liquid such as water is mixed with the fluid to be sucked and discharged It is.

  The operation state of the suction pump 14 is controlled by a suction control panel 50 provided in the ridge 10A on the left side of FIG. Specifically, as will be described later, a negative pressure sensor 52 is provided in the pipeline 42, and the suction pump 14 is operated so that the negative pressure state detected by the negative pressure sensor 52 becomes a preset specified state. . Each floor connecting pipe section 44 is provided with a suction opening / closing valve 56, and the operation state is similarly controlled by the suction control panel 50. The suction opening / closing valve 56 is normally maintained in an open state, and is closed by the suction control panel 50 when a fire occurs. Thereby, the water supply from the water supply pump 12 supplied to the secondary side piping part 40 is prevented from flowing into the pipe line 42 at the time of a fire. Moreover, the water level in the secondary side piping part 40 in the connection part of the secondary side piping part 40 and each floor connecting piping part 44 is monitored, and the water supply pump 12 and the electric motor are operated so that the water level becomes a preset specified state. The valve 28 is controlled.

  In this embodiment, as described above, since the suction pump 14 is provided above the fire extinguishing water tank 18 of the left wing 10A in FIG. 1, the ground connection piping section 48 from the right ridge 10B in FIG. , Drawn long in the ground. In this embodiment, a total of five torii pipings 58 are provided in order to avoid various obstacles. The height of the torii piping 58 was assumed to be easy to understand and all 1 m. As described above, the torii piping 58 is a piping structure in which a horizontal pulling piping portion 64 is provided between the rising piping portion 60 and the falling piping portion 62 and forms a torii shape as a whole. In general, there are many inconveniences in torii piping, so we try to avoid it as much as possible, but there are cases where it can not be avoided in some cases.

  In this embodiment, in the ridge 10B on the right side of FIG. 1, a negative pressure sensor 52 is provided on the lower end portion of the descending piping portion 46, that is, upstream of the rising piping portion 60 of the torii piping 58 in the suction direction. An air introduction valve 54 that introduces air into the descending pipe portion 46 of the pipeline 42 is provided. Accordingly, the air introduction valve 54 is also provided upstream of the rising pipe portion 60 of the torii pipe 58 in the suction direction. The negative pressure sensor 52 detects a negative pressure state in the pipe line 42, particularly in the downstream piping part 46 upstream of the rising piping part 60 in the suction direction, and outputs it to the suction control panel 50. Further, the air introduction valve 54 is maintained in a closed state as a normal state, and is opened by an electric signal from the suction control panel 50. The upstream side in the suction direction indicates the side to be sucked, and the downstream side in the suction direction indicates the side to be sucked. Further, it is desirable that the negative pressure sensor 52 be disposed as low as possible and the air introduction valve 54 be disposed as high as possible.

  FIG. 2A schematically shows the ground connection piping section 48 of the pipe line 42, the suction pump 14, the negative pressure sensor 52, and the air introduction valve 54. In the ground connection piping section 48 of this embodiment, five torii pipings 58 are formed, and the rising piping for connecting to the downstream piping section 46 of the left ridge 10A in FIG. Since the portion 60 is formed, there are a total of six rising piping portions 60. The height of all these rising pipe parts 60 is 1 m, and the negative pressure value created by the suction pump 14 is -0.06 MPa in terms of gauge pressure.

  As is well known, for example, a negative pressure state in a pipe line is generally represented by a gauge pressure where the atmospheric pressure is zero. That is, a negative pressure state having a pressure lower than the atmospheric pressure is generally expressed as a negative pressure because it is represented by a negative value. On the other hand, the absolute pressure at which the absolute vacuum is 0 is expressed as absolute pressure = gauge pressure + atmospheric pressure (= absolute pressure 0.101 MPa). The degree of vacuum is often expressed as “the degree of vacuum is higher” as it is closer to absolute vacuum, and “the degree of vacuum is lower” as it is closer to atmospheric pressure. Conventionally, however, the value of “Torr” representing the degree of vacuum also decreases as the negative pressure state increases, that is, as it is closer to absolute vacuum. Therefore, in any case, when the negative pressure state is represented by a numerical value (negative pressure value), the negative pressure value becomes smaller as the negative pressure state is larger, that is, as the absolute vacuum is closer. Therefore, hereinafter, the fact that the negative pressure value is equal to or greater than a preset specified value means that the degree of vacuum is lower than the preset degree of vacuum.

  FIG. 2A shows a state in which water enters the pipe line 42 and the water stored in the ground connection pipe portion 48 is sucked by the suction pump 14 as in the case of the sprinkler head explosion described above, for example. Thus, when water accumulates in the pipe line 42, it is difficult to avoid air flowing into the accumulated water from the minute leaking portion 68. The air bubbles mixed in the stored water expand as the negative pressure state increases, that is, as the negative pressure value decreases. Since this expanded air (low-pressure air) accumulates in the upper part of the torii piping 58 (horizontal pulling piping part 64), the water stored in the pipe 42 is upstream of the rising piping part 60 in the suction direction, for example, between the torii pipings 58. It is divided in a state where it is stored in the lower horizontal pulling pipe portion 66 of the.

  Since the water is pulled up by about 1 m at -0.01 MPa, if there are a total of six 1 m rising pipe sections 60, the negative pressure created by the suction pump 14 to pump 1 m at a time in six rising pipe sections 60. The state is consumed, and the upstream side in the suction direction, that is, the inside of the descending pipe portion 46 does not become a negative pressure state. In other words, when the total head of the rising pipe section 60 becomes larger than the head of the suction pump 14, the upstream side in the suction direction is not in a negative pressure state. Therefore, in the state of FIG. 2A, the water in the ground connection piping section 48 is not sucked to the suction pump 14 side, and is upstream in the suction direction from the descending piping section 46 of the conduit 42, that is, the secondary piping section 40. The inside does not become a negative pressure state.

  Therefore, in this embodiment, when the negative pressure value detected by the negative pressure sensor 52 reaches a preset negative pressure value, for example, −0.05 MPa, the air introduction valve 54 is preset by the suction control panel 50. The opening operation is performed for a time (for example, 3 minutes). In FIG. 2, for ease of understanding, the air introduction valve 54 is shown immediately above the suction direction of the ground connection pipe part 48, but rises in the pipe line 42 in the negative pressure state and is upstream from the pipe part 60 in the suction direction. When air is introduced on the side, the air flows vigorously into the conduit 42. Then, the water stored in the lower horizontal piping section 66 is sucked to the suction pump 14 side through the rising piping section 60 and the horizontal piping section 64 of each torii piping 58 so as to be pushed by the flow of the introduced atmospheric air. At the same time, the air is sucked to the suction pump 14 side beyond the rising pipe portion 60 immediately above the suction pump 14.

  Since the water sucked through the rising pipe section 60 immediately before the suction pump 14 is drained from the down pipe section 46 of the left ridge 10A of FIG. 1 to which the suction pump 14 is connected, FIG. As shown, the water in the pipe line 42 is reduced. For example, as shown in FIG. 2 (D), if there is a passage for air in the lower horizontal piping section 66, there is no need to pump up the rising pipe section 60, and the inside of the pipe line 42 is returned to a prescribed negative pressure state. it can. Therefore, even when water is stored in the pipe line 42, the water can be drained and the secondary side piping part 40 in the water supply pipe 20 can be maintained in a negative pressure state.

  The opening operation regulation time of the atmosphere introduction valve 54, that is, the atmosphere introduction time is relatively small, for example, about 3 minutes, so that the negative pressure state in the pipeline 42 is insufficient (the negative pressure value becomes too large). It can be avoided that the inside of the secondary side piping section 40 is not in a negative pressure state. Further, after the air introduction valve 54 is closed, the negative pressure value in the pipe line 42 detected by the negative pressure sensor 52 is detected even if, for example, a specified time (for example, one minute) in which the state in the pipe line 42 is stabilized has elapsed. However, when it does not become the above-mentioned negative pressure regulation value, that is, less than −0.05 MPa, the air introduction valve 54 is opened again by the suction control panel 50. That is, as shown in FIG. 2 (C), when the lower horizontal piping section 66 is filled with water, the negative pressure value detected by the negative pressure sensor 52 does not become less than −0.05 MPa. The valve 54 is opened again so that less water is in the line 42.

  And since the opening operation | movement of the air introduction valve 54 for a short time is repeated until the negative pressure value in the pipe line 42 detected with the negative pressure sensor 52 becomes more than a negative pressure regulation value, the water in the pipe line 42 is kept. As the flow rate gradually decreases, for example, as shown in FIG. Accordingly, even if the water in the pipeline 42 cannot be sufficiently drained by one introduction of the atmosphere, the water in the pipeline 42 is gradually drained by repeating the introduction of the atmosphere, so that the negative pressure in the pipeline 42 is reduced. A state can be returned to a regulation state, and, thereby, the secondary side piping part 40 in the water supply piping 20 can be maintained in a negative pressure state.

  In general, when the water stored in the pipeline is discharged (blowed) with air, the air is pressurized and supplied. However, in the wet sprinkler system in which the inside of the secondary side piping section 40 is sucked by the suction pump 14, the inside of the pipe line 42 is in a negative pressure state. Therefore, an air introduction valve 54 is provided on the upstream side in the suction direction of the water storage section. If the atmosphere introduction valve 54 is opened to introduce the atmosphere into the pipeline 42, the atmosphere flows into the pipeline 42 due to the pressure difference between the negative pressure and the atmospheric pressure in the pipeline 42. It becomes possible to discharge.

  Thus, in the wet sprinkler system of this embodiment, the suction pump 14 is provided in the pipe line 42 connected to the secondary side pipe part 40, and the secondary side pipe part 40 is sucked by sucking the inside of the secondary side pipe part 40. When the water filled in the section 40 is maintained in a negative pressure state as a normal state, the negative pressure state in the pipe line 42 is detected as a negative pressure value upstream of the rising pipe part 60 of the pipe line 42 in the suction direction. The negative pressure sensor 52 and the normally-introduced atmosphere introduction valve 54 for introducing the atmosphere into the pipe line 42 are provided. Then, when the negative pressure value in the pipeline 42 detected by the negative pressure sensor 52 is equal to or greater than a predetermined value set in advance, the atmosphere introduction valve 54 is opened to introduce the atmosphere into the pipeline 42. Therefore, when the negative pressure value in the pipe line 42 becomes equal to or higher than the specified value due to pumping in the rising pipe part 60, the atmosphere is vigorously introduced into the pipe line 42 from the upstream side in the suction direction with respect to the rising pipe part 60. The amount of water in 42 is reduced, and it is no longer necessary to pump water at the rising pipe section 60, so that the inside of the pipe line 42 can be returned to a prescribed negative pressure state. Therefore, even when air flows into the stored water in the pipe line 42, the water can be drained and the secondary side pipe portion 40 in the water supply pipe 20 can be maintained in a negative pressure state. .

  In addition, after opening the atmosphere introduction valve 54 for a predetermined time set in advance and then closing the atmosphere introduction valve 54, the atmosphere is vigorously introduced into the pipeline 42, and then the inside of the pipeline 42 is promptly introduced. It can be in a closed state. Therefore, the negative pressure state in the pipe line 42 is not unnecessarily reduced (the negative pressure value is increased), and the secondary side pipe portion 40 in the water supply pipe 20 can be maintained in the negative pressure state.

  In addition, after the air introduction valve 54 is closed, when the negative pressure value in the pipeline 42 detected by the negative pressure sensor 52 does not become less than the specified value, the air introduction valve 54 is opened again to open 1 Even when the water in the pipe line 42 cannot be sufficiently drained by the introduction of the atmosphere twice, the water stored in the pipe line 42 can be gradually drained, and thereby the secondary side pipe in the water supply pipe 20 It becomes possible to maintain the part 40 in a negative pressure state.

  Moreover, even if it is the rise | rising piping part 60 of the torii piping 58 which cannot be avoided, the water in the pipe line 42 can be drained and the secondary side piping part 40 in the water supply piping 20 can be maintained in a negative pressure state.

  In the above-described embodiment, the water supply control panel 32 and the suction control panel 50 are separate, but they may be integrated.

  It goes without saying that the present invention includes various embodiments not described above. Therefore, the technical scope of the present invention is defined only by the invention-specifying matters described in the scope of claims which is appropriate from the above description.

12 Water pump (water supply means)
DESCRIPTION OF SYMBOLS 14 Suction pump 16 Sprinkler head 20 Water supply piping 26 Valve part 32 Water supply control panel 34 Fire detection sensor 38 Primary side piping part 40 Secondary side piping part 42 Pipe line 50 Suction control panel 52 Negative pressure sensor 54 Atmospheric introduction valve 58 Torii piping 60 Rising piping section

Claims (3)

The primary side pipe connected to the water supply means, the secondary side pipe connected to the individually-actuated sprinkler head, and the closed state between the primary side pipe and the secondary side pipe as normal. A water supply pipe that has a valve part for partitioning, constitutes a water supply path from the water supply means to the sprinkler head, and fills both the primary side pipe part and the secondary side pipe part as normal.
A suction pump which is connected to the secondary side pipe via a pipe line and sucks the inside of the secondary side pipe part to maintain the water filled in the secondary side pipe part as a normal state in a negative pressure state; In a wet sprinkler system comprising
Formed in the torii pipe of the pipe line, a rising pipe part where the pipe rises from the upstream side toward the downstream side in the suction direction by the suction pump; and
A negative pressure sensor that is provided upstream of the rising pipe portion in the suction direction and detects a negative pressure state in the pipe as a negative pressure value;
An air introduction valve provided on the upstream side in the suction direction from the rising pipe portion, for introducing air into the pipe line, and being normally closed;
A controller that opens the atmosphere introduction valve to introduce the atmosphere into the pipeline when the negative pressure value detected by the negative pressure sensor is greater than or equal to a predetermined value set in advance; and A wet sprinkler system comprising:   2. The wet sprinkler system according to claim 1, wherein the controller closes the atmosphere introduction valve after opening the atmosphere introduction valve for a predetermined time set in advance.   The control unit opens the air introduction valve again when the negative pressure value detected by the negative pressure sensor does not become less than the specified value after closing the air introduction valve. The wet sprinkler system according to claim 2.

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