Fire alarm system

Abstract

To provide a fire alarm device suitable in renewal of an existing fire alarm device using a pneumatic tube type heat detector to a fire alarm device using a suction type smoke detector.SOLUTION: A fire alarm device includes: a sampling tube with a hole formed for suctioning smoke; a suction type smoke detector connected to the base of the sampling tube that detects whether smoke is being generated based on the air suctioned through the sampling tube; and a pump that serves to suction the air in the sampling tube and draw it into the suction smoke detector. The pump is periodically reversed by timer control for a predetermined period of time.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fire alarm system, and more particularly to a system for updating an already installed fire alarm system using an air tube type heat detector to a fire alarm system using an aspirating type smoke detector. [Background technology]

[0002] Due to recent fire accidents at cultural properties, interest in disaster prevention measures for cultural properties has increased. Conventional fire detection technology for important cultural properties often uses air tube heat detectors.

[0003] The reasons for using air tube heat detectors to detect fires in cultural properties include the following two particular advantages: Advantage 1: Compared to spot-type fire detectors installed in ordinary buildings, air-pipe heat detectors allow the detectors to be installed without damaging the aesthetic appearance of the cultural property being monitored. Advantage 2: Air-pipe heat detectors have the advantage of being able to monitor a relatively wide area by running copper pipes, which act as air pipes, throughout the interior of cultural property buildings, such as in the ceilings.

[0004] Another prior art technique for obtaining these advantages is to use optical fiber instead of air-pipe heat detectors to detect fires (see, for example, Patent Document 1). This type of fire detection also has the same advantage as air-pipe heat detectors in that it detects heat during a fire and, because the installed fiber is inconspicuous, does not spoil the aesthetics of the cultural property being monitored. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-265459 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional technology has the following problems. The heat-sensing fire detection method described above, which takes aesthetics into consideration, has the problem that it takes longer to detect a fire than the smoke-sensing fire detection method. In particular, for important cultural property buildings, it is important not to spoil the aesthetics, and because of their asset value, it is desirable to detect fires early and extinguish them quickly.

[0007] Therefore, there is a strong demand for a method to detect fires more quickly than heat-sensing fire detection methods without damaging the aesthetic appearance of the cultural property being monitored.

[0008] Furthermore, by renovating fire alarm systems that use air-pipe heat detectors that have already been installed, it is expected that the renovation period and costs can be reduced.

[0009] The present invention has been made to solve the above-mentioned problems, and aims to provide a fire alarm system that is suitable for upgrading an existing fire alarm system that uses an air tube type heat detector to a fire alarm system that uses an suction type smoke detector. [Means for solving the problem]

[0010] The fire alarm device according to the present invention comprises: Occurs on the monitored object a sampling tube having a hole formed therein for sucking smoke; Inside the sampling pipe Inhale air, The air being monitored The pump that takes in the water The pump is reversible as a countermeasure when the hole is clogged, and the sampling pipe is formed by drilling a hole for sucking smoke into the air pipe used in a heat-sensing type fire alarm device. It is something. [Effects of the Invention]

[0011] According to the present invention, a fire alarm system suitable for updating an existing fire alarm system using an air tube type heat detector to a fire alarm system using an suction type smoke detector can be obtained. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic configuration diagram of a fire alarm device before renewal and a fire alarm device after renewal in a first embodiment of the present invention. [Figure 2] 1 is a flowchart showing a renewal procedure for upgrading an existing fire alarm system to a new fire alarm system equipped with an aspirating smoke detector in the first embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a fire alarm system according to the present invention will now be described with reference to the accompanying drawings. The fire alarm system of the present invention has a technical feature in that it is configured to be able to repurpose the air pipes used in fire alarm systems that use air pipe-type heat detectors and renew them into fire alarm systems that use suction-type smoke detectors.

[0014] Embodiment 1 Figure 1 is a schematic diagram of a fire alarm system before renewal and a fire alarm system after renewal in embodiment 1 of the present invention. Specifically, the upper part of Figure 1(a) shows the fire alarm system using an air tube type heat detector before renewal, and the lower part of Figure 1(b) shows the fire alarm system using an suction type smoke detector after renewal.

[0015] First, we will explain the fire alarm system using an air pipe type heat detector before renewal shown in Figure 1(a). The fire alarm system 100 using an air pipe type heat detector is configured with a heat detector 110 equivalent to an air pipe type heat detector, and an air pipe 120.

[0016] Air pipe 120 is stretched so as to form a closed loop inside the ceiling or the like of a cultural property, for example, that is the object of fire monitoring, and has two base ends 121. Heat detector 110 is connected to the two base ends 121 of air pipe 120. When the air inside air pipe 120 thermally expands, the diaphragm of heat detector 110 shifts, turning the fire detection contacts ON, thereby detecting that a fire has broken out in the cultural property that is the object of monitoring.

[0017] The air pipe 120 is made of a copper pipe and is approximately 100 m long. Because the air pipe 120 is very long, when it is installed indoors, it is bent in part as shown in Figure 1 so that it can detect temperature rises throughout the room.

[0018] Although not shown, a receiver for alarms and fire indications is connected to the heat detector 110, and a plurality of heat detectors 110 are connected to this receiver.

[0019] A fire alarm system 101 using air pipe heat detectors prevents damage to the aesthetic appearance of cultural properties by running air pipes 120 throughout the interior of a building, such as in the ceiling. However, heat detection fire detection methods have the problem that they take longer to detect a fire than smoke detection fire detection methods.

[0020] Next, we will explain the fire alarm system using the suction-type smoke detector after renewal shown in Figure 1(b). The fire alarm system 1 using the suction-type smoke detector is configured with a smoke detector 10, a sampling pipe 20, and a pump 30.

[0021] The sampling pipe 20 is laid out so as to form a closed loop inside the ceiling or the like of a cultural property, which is the object of fire monitoring, and is provided with a hole 21 for sucking in smoke generated by the object of monitoring.

[0022] In the first embodiment, by drilling holes 21 at a plurality of locations in the existing air pipe 120 shown in FIG. 1(a), the sampling pipe 20 can be formed by reusing the air pipe 120.

[0023] The shape of the hole 21 does not have to be a perfect circle. For example, it may be elliptical, and it is preferable that the hole 21 has a slit shape that is long in one direction and has an opening large enough to prevent clogging. This is because the diameter of the air pipe 120 used in the air pipe type heat detector is very small.

[0024] The pump 30, which is provided after the smoke detector 10, serves to suck in the air in the sampling pipe 20 and take it into the smoke detector 10. Thanks to the operation of this pump 30, the smoke detector 10 acquires the air to be monitored through a plurality of holes 21 provided in the sampling pipe 20, and detects whether the acquired air contains smoke particles, thereby determining whether smoke is being generated. Note that although the pump 30 is shown as being after the smoke detector 10 in the drawing, the pump 30 may also be located before the smoke detector 10.

[0025] Here, the smoke detector 10 and the pump 30 can be collectively referred to as a suction-type smoke detector. The smoke detector 10 is connected to the above-mentioned receiver (not shown), and when the smoke detector 10 detects smoke of a predetermined concentration or higher, the receiver issues an alarm that a fire has occurred and displays the location of the fire.

[0026] The pump 30 can be rotated in reverse by a signal from this receiver, a control panel (not shown), or a control unit in the housing that houses the smoke detector 10. This is a measure to be taken when the hole 21 becomes clogged, since the air pipe 120 is thin; by periodically rotating the pump 30 in reverse, dust and other particles that have become clogged in the hole 21 can be blown out, allowing the indoor air to be sampled correctly through the hole 21.

[0027] The reverse rotation of the pump 30 is performed at a higher rotation speed than the forward rotation that sucks in air, and the reverse rotation is performed for a predetermined period of time at a set time once a day, for example, by timer control provided in a receiver or the like.

[0028] Next, a specific procedure for retrofitting an existing fire alarm system 100 equipped with an air pipe and an air pipe type heat detector into a new fire alarm system 1 equipped with an aspirating type smoke detector will be described using a flowchart.

[0029] Fig. 2 is a flowchart showing a renewal procedure for upgrading an existing fire alarm system 100 to a new fire alarm system 1 equipped with an aspirating smoke detector in the first embodiment of the present invention. Here, a specific explanation will be given using as an example a case where the existing fire alarm system 100 shown in Fig. 1(a) is upgraded to the renewed fire alarm system 1 shown in Fig. 1(b).

[0030] First, in step S201, the worker leaves the air tube 120 connected to the heat detector 110, which corresponds to an air tube type heat detector, and removes the heat detector 110 from the base end 121 of the air tube 120.

[0031] Next, in step S202, the worker drills holes 21 for sucking smoke at multiple locations in the air pipe 120 in order to convert the existing air pipe 120 into a sampling pipe 20 connected to the smoke detector 10. Here, the multiple holes 21 do not need to be drilled at equal intervals along the length of the air pipe 120, as shown in FIG. 1(b), but are drilled so that they are approximately evenly spaced within the monitoring space. That is, in a portion where the air pipe 120 installed in the center of the room is folded back and arranged in two, holes 21 are drilled only in one portion of the air pipe 120.

[0032] As a result of this work, a sampling pipe 20 for smoke suction can be obtained by utilizing an existing air pipe 120 that is arranged so as not to spoil the aesthetic appearance.

[0033] Next, in step S203, the worker attaches an suction-type smoke detector, which is composed of the smoke detector 10 and the pump 30, to the base end of the sampling pipe 20 created in the previous step S202. Note that in the case of a heat detector 110, both ends of the air pipe 120 must be connected to the heat detector 110 to form a closed loop, but in the case of a smoke detector 10, it is sufficient to connect one end of the sampling pipe 20 to the smoke detector 10.

[0034] In this way, by performing the series of processes from step S201 to step S203, it is possible to utilize the air pipe 120 already installed in a building designated as an important cultural property, for example, and retrofit it into a device that can detect fires based on the presence or absence of smoke. As a result, the fire alarm system retrofitting method and fire alarm system according to the first embodiment can achieve the following effects.

[0035] Effect 1: The aesthetic effect of the detector not being conspicuous can be maintained. Effect 2: By changing the fire detection method from heat detection to smoke detection, it will be possible to detect fires within buildings more quickly than before. Effect 3: By utilizing existing parts that can be reused, the repair period and repair costs can be reduced.

[0036] Therefore, according to this embodiment 1, a method for renovating a fire alarm system and a fire alarm system can be obtained that are suitable for updating an existing fire alarm system that uses an air pipe type heat detector to a fire alarm system that uses an suction type smoke detector. [Explanation of symbols]

[0037] 1 fire alarm system, 10 smoke detectors, 20 sampling pipes, 21 holes, 30 pumps.

Claims

1. A sampling tube having a hole formed therein for sucking in smoke generated by a monitoring target; a pump that sucks air from the sampling tube and takes in the air to be monitored; Equipped with The pump is reversible to prevent clogging of the hole. The sampling pipe is formed by drilling a hole for drawing smoke into an air pipe used in a heat-sensing type fire alarm system. Fire alarm system.

2. The reverse rotation of the pump is performed at a higher rotation speed than the forward rotation that sucks in air, and the reverse rotation is performed for a predetermined time at a set time under timer control. The fire alarm device according to claim 1.

3. The pump is periodically rotated in the reverse direction to blow away any dust that has accumulated in the hole, allowing the indoor air to be sampled correctly through the hole. The fire alarm device according to claim 2.

4. The hole for sucking the smoke is a slit-shaped hole that is long in one direction and has an opening large enough to prevent clogging. The fire alarm device according to claim 1.

5. The sampling pipe, which is an air pipe used in the heat-sensing type fire alarm device, is provided in the central part of the room, and in the part where the air pipe is folded back and arranged in two, the hole is provided only in one part of the air pipe. The fire alarm device according to claim 1.

6. The sampling pipes are laid out to form a closed loop inside the cultural property that is the object of fire monitoring. The fire alarm device according to claim 5.

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