Electronic delay device, fire receiver, and sprinkler fire extinguishing facility

Abstract

To allow supply of power to be received from a fire receiver by two wires, and allow an occurrence of flowing water to be notified to the fire receiver.SOLUTION: An electronic delay device includes a resistor 53, a resistance voltage dividing circuit 54, a CPU 52, and a flowing water detection output circuit 57. The resistor 53 is electrically connected to a positive pole and a negative pole of a flowing water detection switch 45 through the two wires, limits an electric current flowing through the resistance voltage dividing circuit 54, and causes a voltage applied to the resistance voltage dividing circuit 54 to be an appropriate value. The resistance voltage dividing circuit 54 divides the voltage by a plurality of resistance elements. The CPU 52 compares a value of the voltage output from the resistance voltage dividing circuit 54 with a predetermined voltage threshold, counts a predetermined delay time when the value of the voltage is the voltage threshold or more, and outputs a signal to the flowing water detection output circuit 57 when the delay time is reached. The flowing water detection output circuit 57 causes a consumption current value of the electronic delay device to be a predetermined current threshold Ia or more on the basis of the signal output from the CPU 52.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an electronic delay device that notifies a fire receiver of the occurrence of flowing water when a flowing water phenomenon in a flowing water detection device that constitutes a fire extinguishing equipment continues for a predetermined period of time, a fire receiver that issues an alarm based on the notification from this electronic delay device, and a sprinkler fire extinguishing equipment equipped with these. [Background technology]

[0002] FIG. 6 is a schematic diagram showing a conventional sprinkler fire extinguishing system 100. As shown in FIG. 6, the sprinkler fire extinguishing system 100 is configured to include a water tank 108, a pump 131, a plurality of water flow detection devices 104, and a plurality of sprinkler heads 106. The sprinkler fire extinguishing system 100 is installed, for example, in a four-story building including one basement floor. The water tank 108 and the pump 131 are provided on the first basement floor. The water flow detection devices 104 and the sprinkler heads 106 are provided on the first to fourth floors (1F to 4F in the figure). The primary side of the water flow detection device 104 on each floor is connected to the pump 131 via a branch pipe. The secondary side of the water flow detection device 104 on each floor is connected to the plurality of sprinkler heads 106 via a pipe arranged on the ceiling of each floor. The water flow detection device 104 includes a water flow detection switch 145 for detecting a water flow phenomenon from the primary side to the secondary side.

[0003] In normal conditions, the sprinkler fire extinguishing system 100 has the piping from the pump 131 to the sprinkler head 106 filled with water. For example, if a fire breaks out on the second floor and the sprinkler head 106 on the second floor starts discharging water, a water flow phenomenon occurs from the primary side to the secondary side of the water flow detection device 104 on the second floor. The water flow detection switch 145 detects the water flow phenomenon that occurs inside the water flow detection device 104 on the second floor and outputs a signal. The water flow detection signal output from the water flow detection switch 145 is input to a fire receiver (not shown) installed in a disaster prevention center or a central control room. Based on the water flow detection signal, the fire receiver issues an alarm to notify the user of a fire that has broken out on the second floor.

[0004] Here, the pipes arranged on the ceiling of each floor to which the multiple sprinkler heads 106 are connected are filled with water, but are not completely filled with water. Some air remains above the center of these horizontal pipes. On the other hand, when a fire breaks out on the second floor and the pump 131 is operated, the pressure on the primary side of the water flow detection devices 104 on the first, third and fourth floors also increases, and an amount of water that replaces the remaining air in the pipes temporarily flows to the secondary side of the water flow detection devices 104 on the first, third and fourth floors. If the water flow detection switches 145 of the water flow detection devices 104 on the first, third and fourth floors detect such a temporary water flow phenomenon and output a signal simultaneously, the fire receiver will not be able to identify the section where the fire is occurring. In order to prevent false alarms due to such a temporary water flow phenomenon, the water flow detection device is provided with a mechanical structure or an electric circuit for delaying the output of the water flow detection signal.

[0005] As a mechanical structure for delaying the output of a water flow detection signal, for example, Japanese Patent Laid-Open Publication No. 7-269522 (Patent Document 1) discloses a signal delay device applied to a water flow detection device. This signal delay device is mainly composed of an air chamber, a diaphragm, first and second movable members, a needle valve, a relief valve, and an operating plate. The air chamber is a space in which the diaphragm and the second movable member are housed, and communicates with a fine air intake port. The diaphragm is held in the air chamber and sandwiched between the first and second movable members. The first and second movable members are supported by the diaphragm in the air chamber, and move up and down in the air chamber when subjected to an external force. The needle valve is disposed between the air chamber and the air intake port, and adjusts the amount of air sucked into the air chamber. The relief valve releases air when the air in the air chamber reaches a certain pressure or higher. The actuating plate is connected to the first movable member that protrudes outside the air chamber and moves together with the first and second movable members to press down the limit switch. This limit switch is always in the ON state and outputs a running water detection signal when it changes from the ON state to the OFF state.

[0006] When an external force is applied to the first movable member, the first and second movable members descend in the air chamber, and the operating plate coupled to the first movable member also descends, pressing the limit switch to the lowest position. At this time, the limit switch is maintained in the ON state, and the air in the air chamber is released from the relief valve. When the external force applied to the first movable member is removed, the first and second movable members rise in the air chamber, and the operating plate coupled to the first movable member also rises. After that, the limit switch returns to its initial state and becomes OFF. The speed at which the first and second movable members rise can be adjusted by adjusting the amount of air sucked into the air chamber with the needle valve. This makes it possible to delay the operation of the operating plate and delay the time until the limit switch becomes OFF. Furthermore, when a temporary water flow phenomenon occurs in the piping, the amount of descent of the working plate is small, and the limit switch is not pressed to the lowest position, so the limit switch that has returned to its initial state maintains the ON state. In other words, the water flow detection signal is not output.

[0007] On the other hand, as an electric circuit for delaying the output of a flowing water detection signal, for example, Japanese Patent Laid-Open Publication No. 8-196658 (Patent Document 2) discloses a flowing water detection device equipped with an electric delay timer. This flowing water detection device is composed of a flowing water channel, a paddle, a magnet, a reed switch, and an electric delay timer. The paddle is rotatably attached in the flowing water channel via a rotating shaft. The magnet is provided at the tip of the paddle. The reed switch is provided outside the water channel at a position corresponding to the magnet of the paddle in the horizontal position. The reed switch maintains the ON state by the magnetic force of the magnet, and turns OFF when the magnet moves away. The electric delay timer operates when the reed switch turns OFF, and outputs a flowing water detection signal when a preset time has elapsed.

[0008] When no water is flowing in the channel, the paddle is horizontal and the magnetic force of the magnet keeps the reed switch in the ON state. On the other hand, when water is flowing in the channel, the paddle rotates upward and the magnet moves away from the reed switch. This causes the reed switch to turn OFF and the electric delay timer to operate. The electric delay timer outputs a flowing water detection signal when a preset time has elapsed. Furthermore, when a temporary flow of water occurs in the channel, the movement of the paddle is small and the distance between the magnet and the reed switch does not increase, so the electric delay timer does not operate. In other words, the flowing water detection signal is not output. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 7-269522 [Patent Document 2] Japanese Patent Application Publication No. 8-196658 [Patent Document 3] JP 2003-102863 A Summary of the Invention [Problem to be solved by the invention]

[0010] The mechanical structure for delaying the output of the running water detection signal delayed the time until the limit switch was turned off by adjusting the amount of air drawn into the air chamber from the air intake. However, the air intake is a very fine hole and is easily blocked by foreign objects such as dust. For this reason, it was difficult for the mechanical structure for delaying the output of the running water detection signal to maintain the accuracy of the delay time, and there was a risk of a false alarm not being output when a fire broke out. For this reason, the original performance of the mechanical structure for delaying the output of the running water detection signal could not be guaranteed unless its operation was checked periodically.

[0011] On the other hand, the electric circuit for delaying the output of the flowing water detection signal required positive and negative power wires to operate the electric circuit, in addition to the L (Line) and C (Common) signal wires for outputting the flowing water detection signal. Normally, power wires are not wired to the pipe shaft through which the piping that constitutes the firefighting equipment passes, so if the means for delaying the output of the flowing water detection signal is an electric circuit, wiring work is required to lay power wires to the electric circuit. Furthermore, while the above-mentioned mechanical structure for delaying the output of the flowing water detection signal operates with two signal wires, the electric circuit requires a total of four wires, two signal wires and two power wires. For these reasons, it has become common to adopt a mechanical structure as a means for delaying the output of the flowing water detection signal.

[0012] Here, Japanese Patent Application Laid-Open Publication No. 2003-102863 (Patent Document 3) discloses a running water detection circuit that can receive power from the L terminal and C terminal of a disaster prevention receiving panel or a repeater. This running water detection circuit includes an alarm circuit that shorts the L terminal and the C terminal to notify the occurrence of a running water phenomenon.

[0013] However, shorting the L terminal and the C terminal means that the L terminal and the C terminal are at the same potential. If the L terminal and the C terminal are at the same potential, the running water detection circuit, which receives power from the L terminal and the C terminal, cannot operate. For this reason, the short circuit between the L terminal and the C terminal by the alarm circuit is considered to be momentary. The alarm circuit executes a first momentary short circuit when a preset delay time has elapsed, which causes the running water detection circuit to lose power and be reset once. Immediately after that, the momentary short circuit is released and the running water detection circuit is restored. At this time, if the running water phenomenon continues, the alarm circuit executes a second momentary short circuit when a preset delay time has elapsed. If the disaster prevention receiving panel is unable to detect the first short circuit, the second and subsequent short circuits are executed after the preset delay time has elapsed, so if the first short circuit is not detected by the disaster prevention receiving panel, a serious problem occurs in that the fire alarm is significantly delayed.

[0014] The present invention has been made in consideration of the above-mentioned problems, and aims to provide an electronic delay device that can receive power from a fire receiver via two wiring and can notify the fire receiver of the occurrence of flowing water, can notify the fire receiver of the occurrence of flowing water continuously without interruption, and can issue a fire alarm without delay, and a fire receiver that issues an alarm based on the notification from this electronic delay device. [Means for solving the problem]

[0015] (1) In order to achieve the above-mentioned object, the electronic delay device of the present invention is an electronic delay device that is electrically connected between the fire line of a fire receiver and the flowing water detection switch of a flowing water detection device, receives power from the L terminal and C terminal of the fire receiver, and alerts the fire receiver to the occurrence of flowing water when the flowing water phenomenon in the flowing water detection device continues for a predetermined period of time, the electronic delay device comprising a processor and a flowing water detection output circuit, the positive and negative terminals of the output side of the electronic delay device are electrically connected to the positive and negative terminals of the flowing water detection switch via two wirings, the processor counts a predetermined delay time when it detects the operation of the flowing water detection switch, and when the delay time is reached, outputs a signal to the flowing water detection output circuit, and the flowing water detection output circuit sets the current consumption value of the electronic delay device to be equal to or greater than a predetermined current threshold Ia based on the signal output from the processor.

[0016] (2) In order to achieve the above object, the electronic delay device of the present invention is an electronic delay device that is electrically connected between a fire line of a fire receiver and a water flow detection switch of a water flow detection device, receives power from the L terminal and C terminal of the fire receiver, and notifies the fire receiver of the occurrence of water flow when a water flow phenomenon in the water flow detection device continues for a predetermined time, and includes a resistor, a resistance voltage divider circuit, a processor, and a water flow detection output circuit, and the resistor is electrically connected to the positive and negative electrodes of the water flow detection switch via two wires, and limits the current flowing through the resistance voltage divider circuit. and sets the voltage applied to the resistive voltage divider circuit to an appropriate value, the resistive voltage divider circuit divides the voltage using a plurality of resistive elements, the processor compares the value of the voltage output from the resistive voltage divider circuit with a predetermined voltage threshold, and when the voltage value is equal to or greater than the voltage threshold, counts a predetermined delay time, and when the delay time is reached, outputs a signal to the running water detection output circuit, and the running water detection output circuit sets the current consumption value of the electronic delay device to be equal to or greater than a predetermined current threshold Ia based on the signal output from the processor.

[0017] (3) Preferably, in the electronic delay device of (2) above, the sum of the resistance values ​​of the resistor and the resistive voltage divider circuit is set to a value such that, when the voltage applied to the resistive voltage divider circuit becomes 0 V, the current consumption value of the electronic delay device is equal to or less than a predetermined current threshold Id, and the current threshold Id is smaller than the current threshold Ia.

[0018] (4) Preferably, the electronic delay device of (3) above further comprises a status indicator LED output circuit and a plurality of status indicator LEDs, wherein the processor compares the value of the voltage output from the resistive voltage divider circuit with the voltage threshold, and when the voltage value is equal to or greater than the voltage threshold, counts a predetermined delay time, and when the delay time is reached, outputs a signal to the status indicator LED output circuit, and when the value of the voltage output from the resistive voltage divider circuit becomes 0V, the processor outputs a signal to the status indicator LED output circuit, and the status indicator LED output circuit lights up at least one of the plurality of status indicator LEDs based on the signal output from the processor.

[0019] (5) Preferably, the electronic delay device of (2) above further comprises a delay time setting switch, the delay time setting switch being configured to enable the delay time to be set manually, and the processor counts the delay time set by the delay time setting switch when the value of the voltage output from the resistive voltage divider circuit is equal to or greater than the voltage threshold value.

[0020] (6) Preferably, in the electronic delay device of (1) to (5) above, it is installed in a location separate from the water flow detection device and is electrically connected to the positive and negative terminals of the water flow detection switch via the two wirings.

[0021] (7) Preferably, in the electronic delay device of (1) to (5) above, the delay device is integrally incorporated into the water flow detection device and electrically connected to the positive and negative electrodes of the water flow detection switch via the two wirings.

[0022] (8) In order to achieve the above object, the fire receiver of the present invention is a fire receiver having an L terminal and a C terminal to which the electronic delay device of (3) above is electrically connected, and is equipped with a current detection unit, a voltage detection unit, and another processor, wherein the current detection unit detects the value of the current flowing between the L terminal and the C terminal and outputs a signal indicating the detected current value, the voltage detection unit detects the value of the voltage applied to the L terminal and outputs a signal indicating the detected voltage value, and the other processor executes the following processes: when the current value becomes equal to or greater than the current threshold value Ia, it notifies the occurrence of a fire; when the current value becomes equal to or less than the current threshold value Id, it calculates a resistance value based on the current value and the voltage value, and when the resistance value is equal to or greater than a predetermined resistance threshold value, it notifies the occurrence of a break in the circuit electrically connected between the L terminal and the C terminal.

[0023] (9) In order to achieve the above object, the sprinkler fire extinguishing system of the present invention is a sprinkler fire extinguishing system comprising the fire receiver and electronic delay device described in (8) above, a water tank, a pump, a water flow detection device, and a closed sprinkler head, wherein the pump draws water up from the water tank through a water supply piping and supplies pressurized water to the primary piping of the water flow detection device, the closed sprinkler head is connected to the secondary piping of the water flow detection device, the water flow detection device is equipped with a water flow detection switch that is activated when a water flow phenomenon occurs, the electronic delay device has an L terminal and a C terminal on the input side and a positive terminal and a negative terminal on the output side, the L terminal and the C terminal on the input side are electrically connected to the L terminal and the C terminal of the fire receiver via two wirings, and the positive terminal and the negative terminal of the output side are electrically connected to the positive and negative terminals of the water flow detection switch via two wirings. Effect of the Invention

[0024] According to the electronic delay device and fire receiver of the present invention, power can be supplied from the fire receiver via two wiring, and the occurrence of flowing water can be notified to the fire receiver, so that the occurrence of flowing water can be notified continuously without interruption, making it possible to issue a fire alarm without delay. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic diagram showing a sprinkler fire extinguishing system including an electronic delay device and a fire receiver according to an embodiment of the present invention. [Diagram 2] Figure 2 is a cross-sectional view showing a water flow detection device that constitutes the above-mentioned sprinkler fire extinguishing system, where Figure 2(a) shows the state of the water flow detection device when no water flow phenomenon is occurring, and Figure 2(b) shows the state of the water flow detection device when water flow phenomenon is occurring. [Diagram 3] FIG. 3 is a block diagram showing the fire receiver of this embodiment. [Figure 4] FIG. 4 is a conceptual diagram for explaining the current threshold values ​​Ia and Id set in the fire control panel of this embodiment. [Diagram 5] FIG. 5 is a block diagram showing the electronic delay device of this embodiment. [Figure 6] FIG. 6 is a schematic diagram showing a conventional sprinkler fire extinguishing system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an electronic delay device according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram showing a sprinkler fire extinguishing system including an electronic delay device and a fire receiver according to the present embodiment.

[0027] 1. Sprinkler fire extinguishing equipment As shown in Fig. 1, the sprinkler fire extinguishing system 1 is installed in a building such as an office or a store, and is mainly composed of a fire receiver 2, a pump unit 3, a water flow detection device 4, an electronic delay device 5, a plurality of closed-type sprinkler heads 6, a test pressure gauge 71, an end test valve 72, an orifice 73, a drain pipe 74, a water tank 8, a pressure tank 9, and a pressure switch 10. The thick solid lines in Fig. 1 indicate the piping through which water flows, and the thin dotted lines in Fig. 1 indicate the power supply and signal paths (including wired and wireless).

[0028] The fire receiver 2 is electrically connected to a pump control panel 33 and an electronic delay device 5 that constitute the pump unit 3 in the figure. The electronic delay device 5 is electrically connected to a water flow detection switch 45 provided in the water flow detection device 4. In addition, the fire receiver 2 is electrically connected to devices such as a fire alarm (transmitter), fire detector, local sound device, emergency broadcast equipment, smoke control equipment, and a reporting device to a security company (not shown).

[0029] The pump unit 3 is provided on the lowest floor of the building, and includes a pump 31, a motor 32, and a pump control panel 33. The inlet of the pump 31 is connected to the water supply pipe, and the outlet of the pump 31 is connected to the primary piping of the water flow detection device 4. A pressure tank 9 and a control valve are connected between the pump 31 and the water flow detection device 4 in the primary piping. The motor 32 is mechanically connected to the pump 31 and drives the pump 31. The pump control panel 33 is electrically connected to the pressure switch 10 and the motor 22, and operates the motor 32 based on a signal transmitted from the pressure switch 10. The pump 31 draws water from the water tank 8 via the water supply pipe, and supplies the pressurized water to the primary piping.

[0030] The pressure tank 9 receives the pressure in the primary piping of the water flow detection device 4. The pressure tank 9 normally maintains the pressure in the primary piping at or above a specified pressure. The pressure switch 10 is activated when the pressure in the pressure tank 10 drops, and sends a signal to the pump control panel 33.

[0031] Details of the water flow detection device 4 will be described later with reference to Fig. 2. In Fig. 1, the secondary piping of the water flow detection device 4 is arranged in the ceiling of a building. A plurality of closed type sprinkler heads 6 are connected to the secondary piping at predetermined intervals. The water outlet of the closed type sprinkler head 6 is normally closed, and when the atmosphere reaches a certain temperature, a heat-sensing part is activated and the outlet opens.

[0032] When the closed sprinkler head 6 opens, water filled in the secondary piping is discharged from the closed sprinkler head 6. This causes a water flow phenomenon in the water flow detection device 4. This water flow phenomenon causes the pressure in the primary piping of the water flow detection device 4 to fall below a specified pressure, and the pressure in the pressure tank 10 drops. This activates the pressure switch 10, which sends a signal to the pump control panel 33. Based on the signal sent from the pressure switch 10, the pump control panel 33 operates the motor 32 to drive the pump 31. This causes water from the water tank 8 to be supplied to the closed sprinkler head 6, and the water discharged from the closed sprinkler head 6 extinguishes the fire.

[0033] A test pressure gauge 71, a terminal test valve 72, an orifice 73, and a drain pipe 74 are connected to the terminal side of the secondary piping of the water flow detection device 4. The orifice 73 has the performance of discharging water equivalent to that of one closed type sprinkler head 6. The terminal test valve 72 is used for testing the sprinkler fire extinguishing system 1 to confirm its operation.

[0034] By opening the end test valve 72, the water filled in the secondary piping of the water flow detection device 4 flows out of the drain pipe 74 through the orifice 73. This causes a water flow phenomenon in the water flow detection device 4. This water flow phenomenon causes the pressure in the primary piping of the water flow detection device 4 to fall below the specified pressure, and the pressure in the pressure tank 10 drops. This causes the pressure switch 10 to operate and send a signal to the pump control panel 33. The pump control panel 33 operates the motor 32 based on the signal sent from the pressure switch 10 to drive the pump 31. In this way, the operation of the sprinkler fire extinguishing system 1 can be checked without opening the outlet of the closed sprinkler head 6. On the other hand, the test pressure gauge 71 is connected before the end of the secondary piping and is used to measure the discharge pressure of the closed sprinkler head 6.

[0035] 2. Flowing water detection device As shown in FIG. 2( a ), the water flow detection device 4 is mainly composed of a valve box 41 , a check valve 42 , a rotating shaft 43 , a stem 44 , a water flow detection switch 45 , and a drain valve 46 .

[0036] The valve box 41 is provided with an inlet 41a, an outlet 41b, and a drain 41c. The inlet 41a is connected to the outlet of the primary piping. The outlet 41b is connected to the inlet of the secondary piping. A drain valve 46 is connected to the drain 41. The check valve 42 is rotatably attached to a valve seat in the valve box 41 via a rotating shaft 43. The stem 44 is swingably attached to the valve box 41. The tip of the stem 44 is inserted into the valve box 41 and located near the valve seat. Meanwhile, the rear end of the stem 44 is inserted into a case in which the flow detection switch 45 is housed and located near the flow detection switch 45. The flow detection switch 45 is opened (OFF state) or closed (ON state) by the swinging rear end of the stem 44. The positive and negative poles of the flow detection switch 45 are electrically connected to the electronic delay device 5 shown in FIG. 1.

[0037] Next, the operation of the water flow detection device 4 will be described. As shown in FIG. 2(a), during normal times when no fire has occurred in the building, the outlet of the closed type sprinkler head 6 is not open. When the outlet of the closed type sprinkler head 6 is not open, no water flows from the inlet 41a to the outlet 41b in the valve box 41 of the water flow detection device 4, and the check valve 42 is closed by the water filled in the valve box 41. When the check valve 42 is closed, the tip of the stem 44 is pressed against the edge of the check valve 42. As a result, the stem 44 maintains a horizontal state. When the stem 44 is horizontal, the rear end of the stem 44 does not press the water flow detection switch 45. As a result, the water flow detection switch 45 is open. The open state of the water flow detection switch 45 means that no water flow phenomenon is occurring in the water flow detection device 4.

[0038] On the other hand, as shown in FIG. 2(b), when a fire breaks out in a building, the outlet of the closed sprinkler head 6 is opened, and the fire is extinguished by the water discharged from the outlet of the closed sprinkler head 6. At this time, water flows from the inlet 41a to the outlet 41b in the valve box 41 of the water flow detection device 4. This water flow causes the check valve 42 to open. When the check valve 42 opens, the tip of the stem 44 is released from the edge of the check valve 42. As a result, the stem 44 swings counterclockwise in the figure, and the tip of the stem 44 is tilted so that the rear end is at the top and the rear end is at the bottom. At this time, the rear end of the stem 44 presses the water flow detection switch 45. As a result, the water flow detection switch 45 is closed. The closed state of the water flow detection switch 45 means that a water flow phenomenon has occurred in the water flow detection device 4.

[0039] 3. Fire Receiver Next, the configuration of the fire receiver 2 according to this embodiment will be described with reference to Fig. 3. As shown in Fig. 3, the fire receiver 2 includes a CPU (processor) 24 for controlling devices such as an electronic delay device 5 and other devices such as a fire alarm and a fire detector (not shown). The CPU 24 has a plurality of channels corresponding to a plurality of devices. A fire line mainly consisting of a power supply circuit 21, a current detection unit 22, a voltage detection unit 23 and an external terminal 25 is electrically connected to each channel of the CPU 24.

[0040] The power supply circuit 21 is electrically connected to a current detection unit 22. The current detection unit 22 and the voltage detection unit 23 are electrically connected to an L terminal constituting an external terminal 25, and a CPU 24. A C terminal constituting the external terminal 25 is electrically connected to the ground of a power supply (not shown).

[0041] The power supply circuit 21 includes a constant voltage circuit for adjusting the main circuit power supply supplied to the fire circuit of the fire receiver 2 to a constant voltage power supply. The constant voltage power supply adjusted by the power supply circuit 21 is supplied to devices such as a fire alarm and a fire detector (not shown) in addition to the electronic delay device 5 electrically connected to the external terminal 25. The current detection unit 22 detects the value of the current flowing between the L terminal and the C terminal of the external terminal 25, and outputs a signal indicating the detected current value to the CPU 24. The voltage detection unit 23 detects the value of the voltage applied to the L terminal of the external terminal 25, and outputs a signal indicating the detected voltage value to the output CPU 24.

[0042] Two current thresholds Ia and current threshold Id shown in FIG. 4 are set in the CPU 24. The current threshold Ia is a threshold for determining the presence or absence of notification from devices such as the electronic delay device 5 connected to the L terminal and the C terminal of the external terminal 25. Notification from the device means the occurrence of a fire. On the other hand, the current threshold Id is a threshold for determining the presence or absence of disconnection of the wiring electrically connecting the electronic delay device 5 and the running water detection switch 45 shown in FIG. 1. The two current thresholds have a relationship of Id < Ia. For example, the current threshold Ia may be set to 12.7 mA, and the current threshold Id may be set to 1.4 mA.

[0043] In FIG. 4, first, the CPU 24 compares the current value I input from the current detection unit 22 with the current threshold value Id. As a result, when it is determined that the current value I is less than the current threshold value Id (I < Id), the CPU 24 calculates the resistance value R based on the current value I and the voltage value V input from the voltage detection unit 23. Then, the CPU 24 compares the calculated resistance value R with a predetermined resistance threshold value Rd. When it is determined that the resistance value R exceeds the resistance threshold value Rd (R > Rd), the CPU 24 executes a process for notifying the disconnection of the circuit electrically connected to the external terminal 25. R > Rd means the disconnection of any of the wirings constituting the circuit shown in FIG. 5. Specifically, the circuit disconnection includes the disconnection of the wiring electrically connecting the external terminal 25 and the electronic delay device 5, the disconnection of the wiring constituting the electronic delay device 5, and the disconnection of the wiring electrically connecting the electronic delay device 5 and the water flow detection switch 45. For example, the resistance threshold value Rd may be set to 13 kΩ.

[0044] Conversely, when it is determined that the current value I exceeds the current threshold value Id (Id < I), the CPU 24 compares the current value I with the current threshold value Ia. As a result, when it is determined that the current value I is less than the current threshold value Ia (I < Ia), the CPU 24 does not execute any process. Id < I < Ia means a normal (monitoring) state where neither a fire nor a disconnection has occurred.

[0045] Conversely, when it is determined that the current value I exceeds the current threshold value Ia (I > Ia), the CPU 24 executes a process for issuing an alarm of fire occurrence. I > Ia means that a water flow phenomenon has occurred in the water flow detection device 4, that is, a fire has occurred in the building where the sprinkler fire extinguishing equipment 1 is installed, and water has been discharged from the discharge port of the closed-type sprinkler head 6.

[0046] 4. Electronic Delay Device Next, the electronic delay device 5 will be described with reference to FIG. 5. As shown in FIG. 5, the L terminal and C terminal on the input side of the electronic delay device 5 are electrically connected to the L terminal and C terminal of the external terminal 25 of the fire receiver 2 shown in FIG. 3. On the other hand, the positive terminal and negative terminal on the output side of the electronic delay device 5 are electrically connected to the water flow detection switch 45 of the water flow detection device 4 shown in FIGS. 2(a) and 2(b).

[0047] Such an electronic delay device 5 mainly includes a rectifier circuit 50, a constant voltage circuit 51, a CPU (processor) 52, a resistor 53, a resistive voltage dividing circuit 54, a delay time setting switch 55, an in-house inspection switch 56, a water flow detection output circuit 57, a status display LED output circuit 58, and a status display LED 59.

[0048] The input of the rectifier circuit 50 is electrically connected to the L terminal and C terminal on the input side of the electronic delay device 5. On the other hand, the output of the rectifier circuit 50 is electrically connected to the constant voltage circuit 51 and the positive terminal on the output side of the electronic delay device 5. The rectifier circuit 50 is a diode bridge circuit that polarizes the power supply supplied from the fire receiver 2 to the electronic delay device 5 and supplies it to the constant voltage circuit 51 and the positive terminal on the output side.

[0049] The constant voltage circuit 51 is electrically connected to the CPU 52. The constant voltage circuit 51 controls the output voltage of the DC power supply converted by the rectifier circuit 50 to be constant and supplies a constant voltage power supply for operating the CPU 52. The constant voltage power supply for operating the CPU 52 is, for example, 2.7 to 3.3V.

[0050] The resistor 53 is electrically connected to two wires that electrically connect the positive terminal and negative terminal on the output side of the electronic delay device 5 and the positive and negative electrodes of the water flow detection switch 45 of the water flow detection device 4. The resistor 53 has a resistance value such that the normal consumption current value I of the electronic delay device 5 including this (the value of the current flowing between the L terminal and C terminal of the external terminal 25) is within the range of Id < I < Ia shown in FIG. 4. Also, the resistor 53 limits the current flowing through the resistive voltage dividing circuit 54 and sets the voltage applied to the resistive voltage dividing circuit 54 to an appropriate value. For example, the resistance value of the resistor 53 is 10 kΩ.

[0051] The input of the resistance voltage dividing circuit 54 is electrically connected to the negative terminal on the output side of the electronic delay device 5. On the other hand, the output of the resistance voltage dividing circuit 54 is electrically connected to the input of the CPU 52. The resistance voltage dividing circuit 54 is composed of a plurality of resistance elements and divides the voltage applied to the resistance voltage dividing circuit 54. The resistance voltage dividing circuit 54 changes the value of the voltage output to the CPU 52 in three ways according to the open / closed state of the flowing water detection switch 45 and the disconnection of the wiring electrically connecting the flowing water detection switch 45 and the electronic delay device 5.

[0052] For example, when the flowing water detection switch 45 is in the open state, that is, during normal times when neither a fire nor a disconnection occurs, the resistance voltage dividing circuit 54 outputs a voltage of 0.6 V to the CPU 52. Also, when the flowing water detection switch 45 is in the closed state, that is, when a flowing water phenomenon occurs in the flowing water detection device 4, the resistance voltage dividing circuit 54 outputs a voltage of 1.9 V to the CPU 52. Further, when the wiring electrically connecting the flowing water detection switch 45 and the electronic delay device 5 is disconnected, the output voltage of the resistance voltage dividing circuit 54 becomes 0 V.

[0053] Here, the sum of the respective resistance values of the resistor 53 and the resistance voltage dividing circuit 54 is set to a value such that when the voltage applied to the resistance voltage dividing circuit 54 becomes 0 V, the consumption current value I of the electronic delay device 5 is less than the current threshold value Id shown in FIG. 4. Thereby, when the wiring electrically connecting the flowing water detection switch 45 and the electronic delay device 5 is disconnected, the CPU 24 of the fire receiver 2 shown in FIG. 3 discriminates a current value I (I < Id) less than the current threshold value Id. Next, the CPU 24 of the fire receiver 2 calculates a resistance value R = V / I based on the current value I and the voltage value V input from the voltage detection unit 23. Thereafter, the CPU 24 compares the calculated resistance value R with a predetermined resistance threshold value Rd. When it is determined that the resistance value R exceeds the resistance threshold value Rd (R > Rd), the CPU 24 executes a process for notifying the disconnection of the wiring electrically connecting the electronic delay device 5 and the flowing water detection switch 45.

[0054] The output of the delay time setting switch 55 is electrically connected to the input of the CPU 52. The delay time setting switch 55 is configured to be able to set a time for delaying the notification of the occurrence of running water by the CPU 52. The delay time setting switch 55 is composed of, for example, two rotary switches each corresponding to two digits of a number. The first rotary switch displays the numbers 1 to 10 corresponding to the ones digit. The second rotary switch displays the numbers 1 to 10 corresponding to the tens digit. A delay time of 0 to 60 seconds can be set by combining the numbers on the first and second rotary switches.

[0055] The in-house inspection switch 56 is electrically connected to the input of the CPU 52. The in-house inspection switch 56 is used to check whether the CPU 52 accurately determines the delay time set by the delay time setting switch 55, and is used before the electronic delay device 5 is shipped to the market. When a delay time of 0 to 60 seconds is set by the delay time setting switch 55 and the in-house inspection switch 56 is closed (ON state), the status display LED 59 displays the value of the set delay time.

[0056] The output of the CPU 52 is electrically connected to the inputs of the running water detection output circuit 57 and the status display LED output circuit 58. First, the CPU 52 compares the value of the voltage output from the resistive voltage divider circuit 54 with a predetermined voltage threshold. When the voltage value is equal to or greater than the voltage threshold, the CPU 52 counts a predetermined delay time. The CPU 52 also compares the value of the voltage output from the resistive voltage divider circuit 54 with the voltage threshold while counting the delay time. When the voltage value becomes less than the voltage threshold before the delay time is reached, the CPU 52 resets the count of the delay time. On the other hand, when the voltage value remains equal to or greater than the voltage threshold until the delay time is reached, the CPU 52 outputs a signal to the running water detection output circuit 57. For example, the voltage threshold set in the CPU 52 is the above-mentioned 1.9V (the value of the voltage output from the resistive voltage divider circuit 54 when the running water phenomenon occurs in the running water detection device 4). Second, when the value of the voltage output from the resistive voltage divider circuit 54 becomes 0V, the CPU 52 outputs a signal to the status display LED output circuit 58.

[0057] The output of the flowing water detection output circuit 57 is electrically connected to the status display LED 59. Based on the signal output from the CPU 52, the flowing water detection output circuit 57 increases the current consumption value I of the electronic delay device 5 to a value exceeding the current threshold value Ia shown in FIG. 4. This causes the CPU 24 of the fire receiver 2 shown in FIG. 3 to determine the current value I exceeding the current threshold value Ia (I>Ia) and execute a process for issuing an alarm of a fire. For example, the flowing water detection output circuit 57 increases the current consumption value of 2 mA in normal times when no signal is output from the CPU 52 to 16 mA based on the signal output from the CPU 52.

[0058] Furthermore, the flowing water detection output circuit 57 lights up a status display LED based on a signal output from the CPU 52, thereby visually notifying the occurrence of a flowing water phenomenon in the flowing water detection device 4, that is, the occurrence of a fire.

[0059] The output of the status indicator LED output circuit 58 is electrically connected to the status indicator LED 59. The status indicator LED output circuit 58 lights up the status indicator LED based on the signal output from the CPU 52, thereby visually notifying that the value of the voltage output from the resistive voltage divider circuit 54 is 0 V, i.e., that the wiring electrically connecting the running water detection switch 45 and the electronic delay device 5 has been broken.

[0060] 4. Effects The electronic delay device 5 and the fire control panel 2 of the present embodiment described above have the following advantages.

[0061] First, the electronic delay device 5 can receive power from the fire receiver 2 through two wires electrically connected to the L terminal and C terminal of the fire receiver 2, respectively, and can notify the occurrence of running water to the fire receiver 2. Therefore, wiring work for laying a power line to the electronic delay device 5 is not required, and it is only necessary to electrically connect the fire receiver 2 and the electronic delay device 5, and the running water detection switch 45 of the running water detection device 2 and the electronic delay device 5 with a total of four wires.

[0062] Secondly, the electronic delay device 5 can notify the fire receiver 2 of the occurrence of running water by increasing its own current consumption value I. As a result, the notification of the occurrence of running water from the electronic delay device 5 is received by the fire receiver 2 continuously without interruption, so there is no failure to notify or delay in the alarm in the fire receiver 2. In other words, it becomes possible for the fire receiver 2 to issue an alarm of a fire without delay. In addition, since the electronic delay device 5 does not short-circuit between the L terminal and the C terminal, it continues to operate normally even after notifying the occurrence of running water.

[0063] Thirdly, since the electronic delay device 5 is electrically connected to the water flow detection switch 45 of the water flow detection device 4 by two wires, it can be installed in a location separate from the water flow detection device 4. This increases the freedom of where to install the electronic delay device 5, and further, it is possible to reliably prevent the electronic delay device 5 from being flooded and broken down due to water leakage from the water flow detection device 4 or piping.

[0064] 5. Other changes The electronic delay device 5 and the fire receiver 2 of the present invention are not limited to the configurations of the above-mentioned embodiment. For example, the electronic delay device 5 may be configured to be attached to the outside of the valve box 41 of the water flow detection device 4. As shown in Fig. 2, the electronic delay device 5 may be configured to have an electric circuit housed in a case housing the water flow detection switch 45.

[0065] For example, the fire receiver 2 is not limited to a configuration that detects the value of the current flowing between the L terminal and the C terminal of the external terminal 25 and issues an alarm. The fire receiver 2 may be configured to detect a unique transmission signal such as a fire signal, a fire indication signal, or a fire information signal and issue an alarm. In this case, a repeater for converting the current consumption value I of the electronic delay device 5 into a transmission signal may be interposed between the electronic delay device 5 and the fire receiver 2. [Explanation of symbols]

[0066] 1. Sprinkler fire extinguishing equipment 2. Fire alarm receiver 21 Power supply circuit 22 Current detection section 23 Voltage detection section 24 CPU(Processor) 25 Fire Line 3 Pump unit 31 Pump 32 Motor 33 Pump control panel 4. Flow detection device 41 Valve box 41a Inlet 41b Outlet 41c Drain port 42 Check valve 43 Rotational Axis 44 Stem 45 Flow detection switch 46 Drain valve 5 Electronic delay device 50 Rectifier circuit 51 Constant voltage circuit 52 CPU 53 Resistor 54 Resistor voltage divider circuit 55 Delay time setting switch 56 In-house inspection switch 57 Flow detection output circuit 58 Status display LED output circuit 59 Status Indicator LED 6. Enclosed sprinkler heads 71 Test pressure gauge 72 Terminal test valve 73 Orifice 74 Drain pipe 8. Water Tank 9. Pressure Tank 10 Pressure Switch

Claims

1. An electronic delay device that is electrically connected between a fire line of a fire receiver and a water flow detection switch of a water flow detection device, receives power from the L terminal and the C terminal of the fire receiver, and notifies the fire receiver of the occurrence of water flow when a water flow phenomenon in the water flow detection device continues for a predetermined time, A processor and a flow detection output circuit are provided, The positive and negative terminals of the output side of the electronic delay device are electrically connected to the positive and negative electrodes of the running water detection switch via two wirings; The processor counts a predetermined delay time when the operation of the running water detection switch is detected, and outputs a signal to the running water detection output circuit when the delay time is reached; An electronic delay device characterized in that the running water detection output circuit sets the current consumption value of the electronic delay device to a predetermined current threshold Ia or greater based on the signal output from the processor.

2. An electronic delay device that is electrically connected between a fire line of a fire receiver and a water flow detection switch of a water flow detection device, receives power from the L terminal and the C terminal of the fire receiver, and notifies the fire receiver of the occurrence of water flow when a water flow phenomenon in the water flow detection device continues for a predetermined time, A resistor, a resistor voltage divider circuit, a processor, and a flow detection output circuit are provided. The resistor is electrically connected to the positive and negative electrodes of the water flow detection switch via two wires, and limits the current flowing through the resistor voltage divider circuit to make the voltage applied to the resistor voltage divider circuit an appropriate value. The resistive voltage divider circuit divides a voltage by a plurality of resistive elements, The processor compares the voltage value output from the resistive voltage divider circuit with a predetermined voltage threshold, and when the voltage value is equal to or greater than the voltage threshold, counts a predetermined delay time, and when the delay time is reached, outputs a signal to the running water detection output circuit; An electronic delay device characterized in that the running water detection output circuit sets the current consumption value of the electronic delay device to a predetermined current threshold Ia or greater based on the signal output from the processor.

3. The electronic delay device of claim 2, wherein the sum of the resistance values ​​of the resistor and the resistive voltage divider circuit is set to a value such that when the voltage applied to the resistive voltage divider circuit becomes 0 V, the current consumption value of the electronic delay device is equal to or less than a predetermined current threshold Id, and the current threshold Id is smaller than the current threshold Ia.

4. Further comprising a status indicator LED output circuit and a plurality of status indicator LEDs; the processor compares the value of the voltage output from the resistive voltage divider circuit with the voltage threshold, and when the value of the voltage is equal to or greater than the voltage threshold, counts a predetermined delay time, and when the delay time is reached, outputs a signal to the status indication LED output circuit; the processor outputs a signal to the status indication LED output circuit when a value of the voltage output from the resistive voltage divider circuit becomes 0 V; 4. The electronic delay device according to claim 3, wherein the status indicator LED output circuit turns on at least one of the plurality of status indicator LEDs based on a signal output from the processor.

5. Further provided with a delay time setting switch, the delay time setting switch is configured to allow the delay time to be set manually; 3. The electronic delay device according to claim 2, wherein the processor counts the delay time set by the delay time setting switch when the value of the voltage output from the resistive voltage divider circuit is equal to or greater than the voltage threshold value.

6. An electronic delay device as described in any one of claims 1 to 5, which is installed in a location separate from the water flow detection device and is electrically connected to the positive and negative terminals of the water flow detection switch via the two wirings.

7. An electronic delay device as described in any one of claims 1 to 5, which is integrally incorporated into the water flow detection device and electrically connected to the positive and negative electrodes of the water flow detection switch via the two wirings.

8. A fire alarm receiver having an L terminal and a C terminal to which the electronic delay device according to claim 3 is electrically connected, A current detector, a voltage detector and another processor are provided, the current detection unit detects a value of a current flowing between the L terminal and the C terminal, and outputs a signal indicating the detected current value; the voltage detection unit detects a value of a voltage applied to the L terminal and outputs a signal indicating the detected voltage value; The other processor, a process of notifying an occurrence of a fire when the current value becomes equal to or greater than the current threshold value Ia; This fire receiver is characterized by executing a process of: calculating a resistance value based on the current value and the voltage value when the current value becomes equal to or less than the current threshold value Id; and, when the resistance value is equal to or greater than a predetermined resistance threshold value, notifying of a break in the wiring electrically connecting the electronic delay device and the flowing water detection switch.

9. A sprinkler fire extinguishing system comprising the fire receiver and electronic delay device according to claim 8, a water tank, a pump, a flow detection device, and a closed sprinkler head, The pump draws water from the water tank through a water supply pipe and supplies pressurized water to a primary pipe of the water flow detection device; The closed-type sprinkler head is connected to a secondary piping of the water flow detection device, The water flow detection device includes a water flow detection switch that is activated when a water flow phenomenon occurs, The sprinkler fire extinguishing system is characterized in that the electronic delay device has an L terminal and a C terminal on the input side and a positive terminal and a negative terminal on the output side, the L terminal and the C terminal on the input side are electrically connected to the L terminal and the C terminal of the fire receiver via two wirings, and the positive terminal and the negative terminal on the output side are electrically connected to the positive terminal and the negative terminal of the water flow detection switch via two wirings.

Images