JPS6347989Y2 - - Google Patents

Description

[Detailed description of the invention] This invention detects the operating status of numerous automatic or manual fire alarms installed in various places on the ship, and the presence or absence of equipment and track failures, and transmits the detection results to the wheelhouse or fire control system. This invention relates to a centrally managed ship fire alarm system that is displayed on a receiver installed at a center, etc.

In recent years, ships have become more labor-saving and automated, and most ships now have unmanned engine rooms. The introduction of a system to centrally manage shipboard work in one place is being promoted, but a particularly important issue here is the establishment of a system that can accurately control shipboard fires.

Conventionally, when a large number of automatic or manual fire alarms installed at various locations on a ship are to be centrally managed, the large number of fire alarms are divided into several regional groups and managed on a group-by-group basis.

To explain this with reference to FIG. 1, in the same figure, n automatic fire alarms 1a, 1b to 1n are
For example, these belong to the upper deck group, and these are connected to the receiver 3 by a pair of tracks 2a and 2b.
It is connected to the. Further, the m automatic fire alarms 4a, 4b to 4m belong to a floor plate deck group, for example, and these are connected to a pair of two tracks 5.
It is connected to the receiver 3 by a and 5b. However, each fire alarm has an electrical contact A that closes when a fire is detected and a relay contact B that closes when a power source is connected. R is the fire alarm at the end of the track 1n, 4
A resistor with a resistance value rΩ connected in parallel with m, 6
indicates AC power supply, and 7 indicates DC power supply. Note that a large number of manual fire alarms are connected to the receiver 3 in the same way as automatic fire alarms.

In the conventional device configured in this way, if the resistance value between the lines of each group as seen from the receiver 3 side is rΩ, it is determined that the automatic or manual fire alarm of the group is in normal operation. If it is ∞Ω, it is determined that the line or power supply has been cut off, and if it is 0Ω, it is determined that a fire has been detected. The receiver 3 side is provided with an alarm that operates based on these resistance value signals, and when an accident is detected, a district indicator light belonging to the group concerned lights up and an alarm bell sounds. Further, when a manual alarm push button switch provided on the side of the receiver 3 is pressed, a common indicator light lights up if the report is from a manual fire alarm.

In this way, the operating status of the fire alarm and the presence or absence of malfunctions in equipment and lines can be grasped on the receiver side, but since notifications from the fire alarm and alarms on the receiver side are performed in groups, the relevant It is not possible to identify which or how many of the fire alarms belonging to a group are reporting, and therefore the receiver cannot grasp the location, range, or scale of the accident and extinguish the fire. There is a drawback that it is easy to get confused with the staffing instructions.

This invention has been made to eliminate the above-mentioned drawbacks of the conventional art, and the inboard fire alarm system of this invention will now be explained with reference to the drawings from FIG. 2 onwards.

In FIG. 2, the first fire alarm 8 has an electrical contact A 1 that closes when a fire is detected, a relay contact _{B 1} that closes when the power is connected, and the like, and the electrical contact A ₁ is
A protective resistance r ₁ is installed between the first line 9 and the second line 10.
connected via. Further, one end of a first series connection body consisting of a relay contact and a resistor R ₁ connected in series with the relay contact is connected to the second line 10 .

The second fire alarm 11 has an electric contact A 2 that closes when a fire is detected, a relay contact B ₂ that closes when the power is connected, and the like, and _{the electric contact A 2 is} connected to the other end of the first series connection body. It is connected to the first line 9 via a protective resistor _r2 . Further, one end of a second series connection body consisting of a relay contact B ₂ and a resistor R ₂ connected in series thereto is connected to the other end of the first series connection body.

The n-th fire alarm 12 has an electrical contact A o that closes when a fire is detected, a relay contact B _o that closes when a power source is connected, and the like, and the electrical contact _{A o is} connected to the other end of the second series connection body. A protective resistor is installed between the 1st line 9 and
Connected via r _o . Also, relay contact B ₃
and a resistor R _o connected in series thereto, one end of the n-th series-connected body is connected to the other end of the second series-connected body, and the other end of the n-th series-connected body is connected to the third line 13. is connected to.

However, the resistance values of the protective resistors r ₁ , r ₂ , and r _o are extremely small compared to the resistance values of the resistors R ₁ , R ₂ , and _Ro . Moreover, each fire alarm may be either automatic or manual, and the electrical contacts A ₁ , A ₂ , and A _o may be relay contacts. Furthermore, if the n-th fire alarm 12 is not required, the other end of the second series connection body may be directly connected to the third line 13; if four or more fire alarms are required, teeth,
An appropriate number of fire alarms may be connected between the second fire alarm 11 and the n-th fire alarm 12 in the same manner as described above.

In this way, the first, second and third lines 9,1
The fire alarm group connected to 0, 13 is connected to the power supply, that is, the relay contact B ₁ ,
By closing B ₂ and _Bo , the connection becomes equivalent to the connection shown by P in FIG. 3. However, the protective resistance r ₁ , r ₂ ,
r _o is ignored. On the other hand, the display 14 includes a voltmeter 15, a current relay 16, and a power source 1 consisting of an electromotive force E.
7, a voltmeter 15 is connected between the first line 9 and the second line 10, and a voltmeter 15 is connected between the second line 10 and the third line 1.
A power supply 17 is connected between the power supply 3 and the current relay 16 .

Here, the combined resistance R is R=R ₁ +R ₂ +R _o , and the voltage V applied to the voltmeter 15 is V=Rx·E/R=K·Rx, where K=E/R.

In reality, a large number of district-specific indicators 14 are provided on the receiver side, and a large number of fire alarms 8,
11 and 12 are connected as described above. Then, when the current relay 16 of each indicator is in a non-operating state, it is determined that the electric circuit or power supply is cut off. Further, when the voltmeter 15 indicates OV, it is determined that it is in a normal operating state, and when it indicates a certain voltage value, it is determined that a fire has been detected. However, when the indicated voltage value is approximately equal to the electromotive force E of the power supply 17,
It is determined that the fire has been detected by the first fire alarm 8, and resistance is detected.
When the voltage value is equivalent to the voltage drop due to _R1 , it is determined that the second fire alarm 11 has detected a fire. Further, when the voltage value is equivalent to the voltage drop caused by the resistors R ₁ and R ₂ , it is determined that a fire has been detected by the n-th fire alarm 12 .

Next, in the embodiment shown in FIG.
While the rectified voltage taken out from the voltmeter is made constant by a constant voltage circuit 19, a switch 20 is provided for making one voltmeter 15 common to all groups. Further, a voltage relay 21 that operates when a fire is detected is connected in parallel to the voltmeter 15. Furthermore, the voltmeter 15 is provided with a scale plate 22 for displaying the position of the fire alarm. Therefore, when two adjacent fire alarms detect a fire at the same time, the pointer will point to the middle of the two position numbers.

As described above, according to the shipboard fire alarm system of this invention, it is possible to accurately grasp the location and range of a fire outbreak based on the analog value displayed on the voltmeter.

[Brief explanation of the drawing]

Figure 1 is an electric circuit diagram of a conventional ship fire alarm system, Figure 2 is an electric circuit diagram on the track side of an embodiment of the ship fire alarm system of this invention, Figure 3 is an equivalent circuit diagram of the same system, and Figure 3 is an equivalent circuit diagram of the same device. FIG. 4 is an electrical circuit diagram of another embodiment. 8...First fire alarm, 9...First track, 10
...Second track, 11...Second fire alarm, 12...
...Nth fire alarm, 13...Third track, 15...
...Voltmeter, 16...Current relay, A ₁ , A ₂ , A _o ...
...Electrical contact, B ₁ , B ₂ , B _o ... Relay contact, R ₁ ,
R ₂ , R _o ...resistance.

Claims (1)

[Scope of utility model registration request] An electrical contact that closes when a fire is detected is connected between the first line and the second line, and one end of the series connection body of the relay contact that closes when the power is connected and the resistor is connected to the second line.
A first fire alarm connected to a line, an electric contact that closes when a fire is detected is connected between the other end of the series connection body and the first line, and a relay contact that closes when electrical connection is made and a resistor. A second fire alarm and a receiver are provided in which a series connection body is connected between the other end and a third line, and the receiver is connected between the first line and the second line. An inboard fire alarm system comprising a voltmeter and a relay connected via a power source between the second line and the third line.