Fire notification facility

Patent metadata

Field	Value
Publication number	US-2020184801-A1
Application number	US-202016795993-A
Country	US
Kind code	A1
Filing date	Feb 20, 2020
Priority date	Jan 22, 2018
Publication date	Jun 11, 2020
Grant date	—

Abstract

A fire detector is connected to a loop transmission path connected to a receiver. When the loop transmission path is normal, a communication connection is made from a transmitting unit to the fire detector to monitor fire. When a break fault occurs in the loop transmission path, a break monitoring control unit turns switching circuit units ON to connect a termination of the loop transmission path to the transmitting unit. To the loop transmission path, a relay detects a current normal direction at normal and a current reverse direction at the time of occurrence of a break for transmission to the receiver. When a break occurs in the loop transmission path, a break section determining unit of the receiver determines, as a break section, a section in which the current normal direction detected by a plurality of the relays is changed to the current reverse direction.

First claim

1 . A fire notification facility in which: a plurality of fire detectors are connected to a loop transmission path connected in a loop shape to a receiver or a relay connected to the receiver; when the loop transmission path is normal, a signal is transmitted from a transmitting unit of the receiver or relay connected to a starting end of the loop transmission path to the fire detector to monitor fire; and when a break occurs in the loop transmission path, a termination of the loop transmission path is connected to the transmitting unit to transmit a signal from both ends of the loop transmission path to the fire detector to monitor fire, the fire notification facility characterized in that
a current direction detecting unit is provided which is connected to the loop transmission path, has a unique address set thereto, detects a current direction flowing through the loop transmission path in a predetermined direction as a current normal direction and detects a current flowing through a direction opposite to the normal current direction as a current reverse direction.

2 . The fire notification facility according to claim 1 , characterized in that
the current direction detecting unit detects a current detection voltage by a current flowing through a current detection resistor connected in series to the loop transmission path, detects the current normal direction when the current detection voltage is a plus voltage or zero volt when a power supply voltage is supplied to the current detecting unit from an upstream side of the current detection resistor, and detects the current reverse direction when the current detection voltage is a minus voltage or zero volt when a power supply voltage is supplied to the current direction detecting unit from a downstream side of the current detection resistor.

3 . The fire notification facility according to claim 1 , characterized in that the current direction detecting unit is provided to a relay connected to the loop transmission path among the plurality of fire detectors connected to the loop transmission path.

4 . The fire notification facility according to claim 1 , characterized in that the current direction detecting unit is provided to a detector base which attachably and detachably connects the fire detector to the loop transmission path.

5 . The fire notification facility according to claim 1 , characterized in that the current direction detecting unit is provided to the fire detector connected to the loop transmission path.

6 . The fire notification facility according to claim 1 , characterized in that the current direction detecting unit includes a display unit which displays a current direction.

7 . The fire notification facility according to claim 1 , characterized in that a plurality of said current direction detecting units are provided to the loop transmission path to transmits the current direction to the receiver or the relay, and
furthermore, a break section determining unit is provided to the receiver or the relay, the break section determining unit which determines, as a break section, a section in which the current normal direction detected at the plurality of current direction detecting units is changed to the current reverse direction when a break occurs in the loop transmission path, and notifies as such.

8 . The fire notification facility according to claim 7 , characterized in that the receiver causes a screen display of a disaster-prevention facility map where arrangement of the loop transmission path and the plurality of current direction detecting units are displayed, and
the break section determining unit causes a current normal group including one or a plurality of said current direction detecting units in which the current normal direction is detected and a current reverse group including one or a plurality of said current direction detecting units in which the current reverse direction is detected to be displayed by color coding with different predetermined colors, and causes occurrence of a break between the color-coded current normal group and current reverse group to be displayed.

9 . The fire notification facility according to claim 7 , characterized in that the receiver makes an at-a-glance display with information for identifying the current direction detecting units and the current direction detected by the current direction detecting units associated with each other.

10 . The fire notification facility according to claim 2 , characterized in that the current direction detecting unit includes a display unit which displays a current direction.

11 . The fire notification facility according to claim 3 , characterized in that the current direction detecting unit includes a display unit which displays a current direction.

12 . The fire notification facility according to claim 4 , characterized in that the current direction detecting unit includes a display unit which displays a current direction.

Assignees

• Hochiki Co

Inventors

• Matsuda Yoshihiro
• Kaneko Shigeru
• Ono Takehiro
• Ishida Akira

Classifications

• G08B26/004

  with common interrogation of substations · CPC title

• G08B25/045

  with sensing devices and central station in a closed loop, e.g. McCullough loop · CPC title

• G08B25/04 Primary

  using a single signalling line, e.g. in a closed loop · CPC title

• G08B17/00

  Fire alarms; Alarms responsive to explosion · CPC title

• G08B29/06

  Monitoring of the line circuits, e.g. signalling of line faults · CPC title