JP2007175326A - Suppression method of air circulation, fire extinguishing system usable of method and foam head for use in fire extinguishing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an art suppressing undesirable circulation of air. <P>SOLUTION: A plurality of rooms 62a, 62b and 62c belonging to a block 60 are provided with foam heads 40a, 40b and 40c for discharging extinguishing agent respectively and the foam heads are connected to a same pipe 30. For suppressing the air circulation via the pipe 30, each foam head 40 has a thin film for suppressing the air circulation and having such strength as being fractured by a pressure for discharging the extinguishing agent when the extinguishing agent is emitted via the pipe 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a technique for suppressing inflow and outflow of an undesirable fluid, and in particular, a method for suppressing air flow through a piping of a fire extinguishing facility, and a method that can use the method and a fire extinguishing system that can be used. Regarding possible foam heads.

Currently, various types of fire extinguishing equipment are provided according to the type of the object to be protected. Among them, bubble fire extinguishing equipment is one example of the third type fire extinguishing equipment. The foam head type fire extinguishing equipment foams the foam mixed solution sent from the pipe with the air sucked into the foam head and discharges it to the object. In the foam head type fire extinguishing equipment, generally, each block including a plurality of rooms is provided with a simultaneous opening valve for controlling the supply of the fire-extinguishing agent, and when the simultaneous opening valve is opened, Fire extinguishing agent is emitted from all the foam heads included in the. That is, the foam heads provided in a plurality of rooms included in the same block are all connected to the same piping system.
Japanese Patent Laid-Open No. 2002-291921

  In such a foam fire-extinguishing facility, spaces such as rooms and hallways in the same block are connected by a digestive supply pipe. In rooms that require a very high level of cleanliness, such as clean rooms, the air pressure in the room is generally set higher than in other rooms to prevent air containing dust from flowing in from other rooms. When an abnormality such as a reverse of the atmospheric pressure of the room occurs due to a malfunction of the adjustment mechanism or the like, it cannot be said that there is no danger of air flowing in from other rooms through the digestive supply pipe. In recent years, standards for cleanliness have become stricter, and there is a need for a technique that more reliably suppresses air flow.

  The present invention has been made in view of such a situation, and an object thereof is to provide a technique for suppressing undesirable air circulation.

  An embodiment of the present invention relates to a method for suppressing air circulation. This method does not allow air to pass through the air flow path in order to suppress the flow of air through the pipes between a plurality of divided spaces connected to the same pipe system of the fire extinguishing equipment, and When the digestive drug is released through the pipe, a thin film that is broken by the discharge pressure of the digestive drug is provided.

  The partitioned space may be, for example, a room in a building, a hallway, or the like. The thin film may be a metal thin film such as aluminum. According to this aspect, it is possible to suppress the flow of air through the pipe for supplying the digestive agent without hindering the release of the digestive agent during fire extinguishing by a simple and low-cost method.

  Another aspect of the invention relates to a fire extinguishing system. This fire extinguishing system includes a plurality of foam heads provided in each of a plurality of partitioned spaces for discharging digestive drugs into the spaces, and pipes for supplying the digestive drugs to the plurality of foam heads. Or a foam head is provided with a thin film that suppresses air flow and breaks due to the discharge pressure of the digestive drug when the digestive drug is released through the pipe.

  Yet another aspect of the invention also relates to a fire extinguishing system. This fire extinguishing system includes a plurality of foam heads, which are provided in each of a plurality of divided spaces, for releasing digestive drugs into the spaces, piping for supplying the foam heads with digestive drugs, and digestive drugs for the foam heads. And a valve for controlling the supply of. When a foam head provided in a plurality of spaces is connected to the piping downstream of the valve, the flow of air is suppressed inside the piping downstream of the valve or to the foam head, and the digestive drug is passed through the piping. A thin film that is broken by the release pressure of the digestive agent is provided when releasing the lysate.

  Yet another aspect of the present invention relates to a foam head. This foam head is a foam head for releasing a digestive drug, and provided with a thin film in the flow path of the digestive drug that inhibits the flow of air and is broken by the pressure when the digestive drug is released. It is characterized by that. By providing the thin film on the foam head, it is possible to improve the maintainability when replacing the thin film.

  It should be noted that any combination of the above-described constituent elements and a representation obtained by converting the expression of the present invention between a method, an apparatus, a system, and the like are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which suppresses the distribution | circulation of the undesirable air can be provided.

  FIG. 1 shows a configuration of a building 10 provided with a fire extinguishing system 100 according to an embodiment. The fire extinguishing system 100 of the present embodiment is a foam head type fire extinguishing equipment, a pipe 30 for supplying a fire extinguishing agent, and foam heads 40a, 40b, 40c for radiating the extinguishing agent to an object. And a simultaneous opening valve 32 is included. The fire extinguishing system 100 divides the space in the building 10 such as a room or a corridor separated by walls or the like into blocks 50, 60, 70,... Extinguish fires in units of blocks. That is, the foam heads 40 provided in the same block are connected to the same pipe, and the simultaneous release valve 32 is provided upstream of the pipe. For example, the block 60 includes three chambers 62a, 62b, and 62c, and upstream of the piping connecting the foam heads 40a, 40b, and 40c provided in the three chambers 62a, 62b, and 62c, respectively. A simultaneous opening valve 32 is provided.

  When a control unit (not shown) detects the occurrence of a fire, it opens the simultaneous release valve 32 of the block where the fire has occurred. When the simultaneous opening valve 32 is opened, the fire extinguishing agent supplied through the pipe 30 is radiated from all the foam heads 40a, 40b, and 40c connected to the same piping system downstream of the simultaneous opening valve 32. That is, when a fire occurs in any one of the rooms 62a, 62b, and 62c, the fire extinguishing agent is simultaneously emitted to the other rooms in the block 60. Thereby, the fire spread to the surrounding block can be suppressed effectively.

  In manufacturing plants for pharmaceuticals and semiconductors, there may be a pressure difference between rooms to prevent chemical substances, pathogens, microorganisms, microparticles, etc. from flowing into or from other rooms. is there. For example, if air flows from a room with low cleanliness into a cleanroom where high cleanliness is required, the cleanliness of the cleanroom may fall below the required level. Therefore, an air conditioning system 200 is provided to adjust the air pressure inside the room according to the level of cleanliness determined in advance according to the contents of work performed inside each room.

  The air conditioning system 200 includes an upstream pipe 20, inflow adjustment dampers 28a, 28b, 29c, ..., intake ports 24a, 24b, 24c, ..., exhaust ports 26a, 26b, 26c, ..., outflow amount. The adjustment dampers 29a, 29b, 29c,... The inflow amount adjusting damper 28 is provided for each room 62 and adjusts the amount of air flowing from the upstream pipe 20 into each room 62. The outflow amount adjusting damper 29 is also provided for each room 62, and adjusts the amount of air flowing out from each room 62 to the downstream pipe 22. By opening and closing these dampers, the air pressure inside each room is adjusted. By making the air pressure of the room where high cleanliness is required higher than the air pressure of the other room, the inflow of air from the other room can be suppressed. Further, for example, by reducing the pressure in a room that handles a chemical substance that adversely affects the human body to be lower than the pressure in another room, it is possible to prevent the air containing the chemical substance from flowing into the other room. The intake port 24 and the exhaust port 26 are provided with filters to prevent inflow and outflow of pathogenic bacteria and dusts present in the air.

  Since the foam heads 40a, 40b, and 40c provided in the chambers 62a, 62b, and 62c in the block 60 are connected by the same piping system, if there is no pressure difference between the chambers, the foam head 40 There is a possibility that air may circulate through a bubble outlet or an air inlet. While there is no problem while the air conditioning system 200 is functioning normally, when a situation such as a malfunction of the pressure adjustment mechanism occurs, the indoor pressure becomes an unexpected value, for example, a room where high cleanliness is required. The pressure of the air becomes low, and the possibility that air will flow into the room from other rooms through the pipe 30 is not complete. In addition, when a door that leads to two or more rooms with different required cleanliness levels is provided in a room, the doors are controlled not to open at the same time. May open at the same time, the air pressure in the room becomes an unexpected value, and there is a possibility that inflow and outflow of air through the pipe 30 may occur.

  For example, in the manufacture of pharmaceuticals, a situation where a chemical substance or pathogen that adversely affects the human body flows in from another room or flows out to another room, causing the room to become contaminated should not occur. It is not to be. In the present embodiment, in consideration of such a problem, a technique for more reliably suppressing the air flow through the pipe 30 without impeding the function of the fire extinguishing system 100 is proposed.

  FIG. 2 shows an internal configuration of the foam head 40 according to the embodiment. The foam head 40 includes a jig 44 for arranging a thin film 42 of metal or the like so as to block a flow path of air or a fire extinguishing agent. By providing this thin film 42, the air flow through the foam head 40 can be reliably blocked. The thin film 42 is preferably made of a material that can block air flow and has excellent corrosion resistance, and may be a metal such as aluminum, for example. The thin film 42 is not broken by the pressure difference generated above and below the thin film 42, and has a strength that can be easily broken by the pressure of the fire-extinguishing agent flowing out when the simultaneous release valve 32 is opened in the event of a fire. Thereby, it is possible to more reliably suppress the air flow between the rooms at the normal time and to appropriately radiate the extinguishing agent at the time of a fire.

  The thickness of the thin film 42 may be designed according to the pressure difference between the rooms and the pressure when the extinguishing agent is released. For example, when the pressure difference generated between rooms having different cleanliness is about 50 Pa at the maximum, it is necessary to withstand a pressure of at least 50 Pa, and preferably it does not break even at a pressure of several hundred to several thousand Pa. Strength. Thereby, it can prevent that the thin film 42 fractures | ruptures and air distribute | circulates at normal time. Moreover, when the blowing pressure of the fire-extinguishing agent in the foam head portion is 0.35 MPa, for example, the thickness is set so as to break at a pressure of about 0.05 MPa, which is 1/7 of the pressure. Thereby, at the time of a fire outbreak, the thin film 42 can be reliably broken and the fire-extinguishing agent can be emitted. In addition, even when there is a place where pressure distribution is generated when the fire extinguishing agent flows through the pipe 30 and the pressure is locally lower than 0.35 MPa, it breaks at a pressure sufficiently lower than 0.35 MPa. By setting the thickness to be, the thin film 42 can be surely broken and the fire extinguishing agent can be emitted.

  FIG. 3 shows the results of measuring the breaking pressure of the aluminum thin film. As samples, hard aluminum thin films (indicated by “H” in the figure) and soft aluminum thin films (indicated by “O” in the figure) of various thicknesses were prepared. Screw the aluminum thin film into the tip of the test jig, gradually increase the pressure with a manual hydraulic pump, and visually check the pressure when the aluminum thin film breaks with a pressure gauge (0 to 0.5 MPa) attached to the jig. I read it. 12 μm thick hard aluminum thin film (sample 3) and soft aluminum thin film (sample 4), 9 μm thick soft aluminum thin film (sample 5), 7 μm thick soft aluminum thin film (sample 6) were fire extinguished at 0.35 MPa. It was confirmed that the rupture was caused by blowing the medicine. As described above, in the case of the fire extinguishing system 100 that releases a fire extinguishing agent at 0.35 MPa, as described above, a soft aluminum thin film having a thickness of 7 μm that breaks at a pressure of 0.05 MPa or less is suitable.

  As described above, according to the technology of the present embodiment, the simple and low-cost configuration appropriately suppresses the flow of air through the pipe that supplies the digestive agent without hindering the release of the digestive agent during fire extinguishing. can do.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are also within the scope of the present invention. is there.

  In the embodiment, the thin film 42 is provided in the foam head 40, but in another example, the thin film 42 may be provided in the pipe 30. Moreover, although embodiment demonstrated the case where the fire extinguishing system 100 was a foam head type foam fire extinguishing equipment, the technique of this Embodiment is applicable also to other fire extinguishing equipment.

It is a figure which shows the structure of the building provided with the fire extinguishing system which concerns on embodiment. It is a figure which shows the internal structure of the foam head which concerns on embodiment. It is a figure which shows the result of having measured the fracture | rupture pressure of the aluminum thin film.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Building, 20 ... Upstream piping, 22 ... Downstream piping, 28 ... Inflow adjustment damper, 29 ... Outflow adjustment damper, 30 ... Piping, 32 ... Simultaneous opening valve, 40 ... foam head, 42 ... thin film, 44 ... jig, 50, 60, 70 ... block, 62 ... room, 100 ... fire extinguishing system, 200 ...・ Air conditioning system.

Claims (5)

  In order to suppress the flow of air through the piping between a plurality of partitioned spaces connected to the same piping system of the fire extinguishing equipment, air is not passed through the air flow path, and A method for inhibiting air flow, comprising providing a thin film that is broken by a discharge pressure of the digestive drug when the digestive drug is discharged through a pipe.   The method for inhibiting air circulation according to claim 1, wherein the thin film is provided in the vicinity of an outlet for releasing the digestive drug into the space. A plurality of foam heads provided in each of a plurality of partitioned spaces for releasing digestive drugs into the spaces;
A pipe for supplying the digestive agent to the plurality of foam heads,
A fire extinguishing system, characterized in that a thin film is provided in the pipe or in the foam head to prevent air from flowing and to rupture due to the digestion discharge pressure when the digestion is discharged through the pipe. A plurality of foam heads provided in each of a plurality of partitioned spaces for releasing digestive drugs into the spaces;
Piping for supplying the digestive agent to the foam head;
A valve for controlling the supply of the digestive agent to the foam head,
When the foam heads provided in a plurality of the spaces are connected to the piping downstream of the valve, the flow of air is suppressed in the piping downstream of the valve or in the foam head, and A fire extinguishing system comprising a thin film that is broken by a discharge pressure of the digestive drug when the digestive drug is discharged through a pipe. A foam head for releasing digestive drugs,
A foam head characterized in that a thin film is provided in the flow path of the digestive agent to prevent air from flowing and to be broken by pressure when the digestive agent is released.

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