Auxiliary pressurizing device

Abstract

To provide an auxiliary pressurizing device capable of preventing in advance, a pump damage caused by an operation when a check valve is fastened and broken, the check valve being provided on a discharge side of an auxiliary pressurizing pump.SOLUTION: An auxiliary pressurizing pump control board 52 is configured to start up an auxiliary pressurizing pump 40 when receiving from a main pipe pressure detecting switch 48, a main pipe pressure reduction detecting signal of a water supply main pipe 18, then stop the auxiliary pressurizing pump 40 when reception of the main pipe pressure reduction detecting signal is stopped. For coping with fastening abnormality of a check value 46 provided on a pipeline on a discharge side of the auxiliary pressurizing pump 40, on a primary side of the check valve 46, there is provided an auxiliary pressurizing operation detecting switch 50 for outputting an auxiliary pressurizing operation detecting signal by detecting a discharge pressure of the auxiliary pressurizing pump 40. When reception of the main pipe pressure reduction detecting signal is continued over a prescribed period of time, during reception of the auxiliary pressurizing operation detecting signal, the auxiliary pressurizing pump control board 52 forcibly stops the auxiliary pressurizing pump 40 even when the main pipe pressure does not recover, by determining that, the auxiliary pressurizing pump is in an abnormal state during an operation and the check valve 46 is not opened.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an auxiliary pressurizing device for a sprinkler fire extinguishing facility that supplementarily compensates for a pressure drop in a main water supply pipe that supplies fire extinguishing water to a sprinkler head.

Background Art

[0002] Conventionally, a wet sprinkler fire extinguishing facility has a closed-type sprinkler head connected to a branch pipe branched from a main water supply pipe of a fire extinguishing pump for each protected compartment, and the main water supply pipe and the branch pipe are filled with fire extinguishing water pressurized to a predetermined regulated pressure.

[0003] When the sprinkler head operates due to a fire, the pressure drop in the main water supply pipe due to the water discharge from the sprinkler head is detected to start the fire extinguishing pump, and fire extinguishing water is supplied to continuously discharge water from the operated sprinkler head.

[0004] In addition, the pressure in the main water supply pipe may decrease due to a decrease in temperature or the like, causing the air in the pipe to contract. To recover such a temporary pressure drop in the pipe, an auxiliary pressurizing device using a small auxiliary pressurizing pump with a smaller capacity than the fire extinguishing pump is provided. When the pressure in the main water supply pipe drops below the auxiliary pressurizing start pressure set higher than the regulated pressure for starting the fire extinguishing pump, the auxiliary pressurizing pump is started to keep the pressure in the main water supply pipe at a value equal to or higher than the regulated pressure.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in such a conventional auxiliary pressurizing device, the pipe from the discharge side of the auxiliary pressurizing pump is connected to the main water supply pipe via a check valve. During construction, the check valve may be defective, or due to the aging of the check valve during equipment operation, when the auxiliary pressurizing pump is operated, the valve body of the check valve may become stuck and fail to open, resulting in a sticking failure. If the check valve does not open, the pressure in the main water supply pipe will not recover to the specified pressure or higher. For example, during the unmanned nighttime hours, the auxiliary pressurizing pump may remain in operation. Since the auxiliary pressurizing pump compensates for a temporary pressure drop in the main water supply pipe, continuous operation over a long period of time is not assumed, and there is a problem that the drive motor and the pump shaft part may overheat abnormally and break down.

[0007] When an abnormality occurs during the operation of the auxiliary pressurizing pump in this way, an abnormal alarm is issued before a failure occurs. However, during construction or inspection, the acoustic alarm is stopped, so there is a problem that the abnormality of the auxiliary pressurizing pump cannot be noticed and the auxiliary pressurizing pump may be damaged.

[0008] An object of the present invention is to provide an auxiliary pressurizing device that can surely prevent pump damage due to operation when a check valve provided on the discharge side of an auxiliary pressurizing pump becomes stuck.

Means for Solving the Problem

[0009] (Auxiliary Pressurizing Device 1) In the present invention, an auxiliary pressurizing pump is connected to a main water supply pipe that supplies fire extinguishing water to a sprinkler head via a check valve. When the main pipe pressure of the main water supply pipe drops, the operation of the auxiliary pressurizing pump is started, and when the main pipe pressure recovers, the operation of the auxiliary pressurizing pump is stopped. The auxiliary pressurizing device is characterized in that when the main pipe pressure drops and the operation of the auxiliary pressurizing pump is started after that 、 while detecting the discharge pressure of an auxiliary pressure pump capable of releasing the check valve from the pressure on the primary side of the check valve if the drop in the main pipe pressure continues from the pressure on the secondary side of the check valve beyond a predetermined time detecting that it is the operation of the auxiliary pressurizing pump is stopped.

[0010] (Auxiliary Pressurizing Device 2) The present invention relates to an auxiliary pressure boosting pump for auxiliary pressure boosting of a main water supply pipe that supplies fire extinguishing water to a sprinkler head, a check valve provided in a pipe connecting the auxiliary pressure boosting pump to the main water supply pipe, a first pressure detector provided on the secondary side of the check valve, which outputs a main pipe pressure drop detection signal when the main pipe pressure of the main water supply pipe drops below a predetermined pressure or falls below the predetermined pressure, and stops outputting the main pipe pressure drop detection signal when the main pipe pressure exceeds the predetermined pressure or becomes equal to or higher than the predetermined pressure, a control unit that starts the operation of the auxiliary pressure boosting pump when receiving the main pipe pressure drop detection signal and stops the operation of the auxiliary pressure boosting pump when the reception of the main pipe pressure drop detection signal stops, in an auxiliary pressure boosting device provided with a second pressure detector for detecting the discharge pressure of the auxiliary pressure boosting pump and outputting an auxiliary pressure boosting operation detection signal is provided on the primary side of the check valve, the control unit is characterized in that when the reception of the main pipe pressure drop detection signal continues for a predetermined time during the reception of the auxiliary pressure boosting operation detection signal, the operation of the auxiliary pressure boosting pump is stopped.

[0011] (Output of abnormal stop alarm) When the control unit stops the operation of the auxiliary pressure boosting pump, it outputs an abnormal stop alarm by sound and display.

Advantages of the Invention

[0012] (Effect of the auxiliary pressure boosting device) According to the auxiliary pressure boosting device of the present invention, when the auxiliary pressure boosting pump is started by detecting a drop in the in-pipe pressure of the main water supply pipe, if the check valve has a sticking failure, the pressure on the primary side of the check valve rises simultaneously with the start of the pump operation due to the operation of the auxiliary pressure boosting pump, but the pressure on the secondary side of the check valve, that is, the main pipe pressure of the water supply pipe, does not recover over time and remains in a pressure drop detection state. Therefore, when such an abnormal operation state continues for a predetermined time, it is regarded as a sticking failure of the check valve, and even if the main pipe pressure does not recover to the specified pressure, the auxiliary pressure boosting pump is forcibly stopped, and it is surely prevented that a failure occurs due to the continuous operation of the auxiliary pressure boosting pump caused by the sticking failure of the check valve.

[0013] (Effect by Output of Abnormal Stop Alarm) Also, even if the acoustic alarm of the auxiliary pressurizing pump is stopped during construction or inspection, since the abnormal stop alarm by the alarm indicator light is being performed, even an auxiliary pressurizing pump that is normally stopped with little operation can be easily understood that the auxiliary pressurizing pump has stopped due to a failure abnormality, and it is possible to easily take measures such as repair and replacement of the check valve that caused the stop.

Brief Explanation of Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0015] Hereinafter, embodiments of the auxiliary pressurizing device according to the present invention will be described in detail based on the drawings. Note that the present invention is not limited by the following embodiments.

[0016] [Basic Concept of Embodiment] First, the basic concept of the embodiment will be described. The embodiment generally relates to an auxiliary pressurizing device for sprinkler fire extinguishing equipment.

[0017] Here, the "sprinkler fire extinguishing equipment" is a facility that suppresses and extinguishes a fire by discharging the fire extinguishing water sent from a pressurized water supply device equipped with a fire pump through a main water supply pipe when a closed-type sprinkler head installed in a predetermined protected area such as the interior of a building receives a hot air current due to a fire and opens and operates.

[0018] Also, the "auxiliary pressurizing device" is an auxiliary pressurizing device in which an auxiliary pressurizing pump is connected to the main water supply pipe that supplies fire extinguishing water to the sprinkler head via a check valve, starts the operation of the auxiliary pressurizing pump when the main pipe pressure of the main water supply pipe drops, and stops the operation of the auxiliary pressurizing pump when the main pipe pressure recovers.

[0019] Also, the auxiliary pressurizing device includes, in addition to the auxiliary pressurizing pump and the check valve, a first pressure detector, a second pressure detector, and a control unit.

[0020] The "first pressure detector" is provided on the secondary side of the check valve, outputs a main pipe pressure drop detection signal when the main pipe pressure of the main water supply pipe drops below a predetermined pressure or falls below the predetermined pressure, and stops the output of the main pipe pressure drop detection signal when the main pipe pressure exceeds the predetermined pressure or becomes equal to or higher than the predetermined pressure. It is a concept including a pressure detection switch and a pressure sensor.

[0021] Also, the "second pressure detector" is provided on the primary side of the check valve, detects the discharge pressure of the auxiliary pressurizing pump, and outputs an auxiliary pressurizing operation detection signal. It is a concept including a pressure detection switch and a pressure sensor.

[0022] Also, the "control unit" main pipe starts the operation of the auxiliary pressurizing pump when receiving a pressure drop detection signal from the first pressure detector, main pipe and when the reception of the pressure drop detection signal stops toIt stops the operation of the auxiliary pressure pump. Further, when the reception of the main pipe pressure drop detection signal continues beyond a predetermined time during the reception of the auxiliary pressure operation detection signal, it stops the operation of the auxiliary pressure pump. When the main pipe pressure of the water supply pipe does not recover even when the auxiliary pressure pump is operated and an abnormal operation state continues for a predetermined time, it is regarded as a sticking failure of the check valve, and the auxiliary pressure pump is forcibly stopped to surely prevent the failure of the auxiliary pressure pump caused by the sticking failure of the check valve.

[0023] In addition, when the control unit stops the auxiliary pressure pump assuming a sticking failure of the check valve, it outputs an abnormal stop alarm. Even for an auxiliary pressure pump that is normally stopped with little operation, it can be determined that the auxiliary pressure pump has stopped due to a failure abnormality, and corresponding measures such as repair and replacement of the check valve that caused the stop can be taken.

[0024] Hereinafter, specific embodiments will be described. In the specific embodiments shown below, the case where the "sprinkler fire extinguishing equipment" is "wet sprinkler fire extinguishing equipment", the "control unit" is "auxiliary pressure pump control panel", the "first pressure detector" is "main pipe pressure detection switch", and the "second pressure detector" is "auxiliary pressure operation detection switch" will be described.

[0025] [Specific content of the embodiment] The fire extinguishing equipment inspection system will be described in more detail. The content will be described separately as follows. a. Wet sprinkler fire extinguishing equipment b. Auxiliary pressure pump control panel b1. Configuration of the control unit b2. Auxiliary pressure control b3. Auxiliary pressure control when the check valve has a sticking failure c. Other embodiments of the control function by the auxiliary pressure pump control panel d. Modification example of the present invention

[0026] [a. Wet sprinkler fire extinguishing equipment] The wet sprinkler fire extinguishing equipment will be described in more detail. Fig. 1 is an explanatory diagram showing the outline of the wet sprinkler fire extinguishing equipment provided with an auxiliary pressurizing device. As shown in Fig. 1, a fire pump 10 is installed in a pump room such as the basement floor of a building and is driven by a motor 12. The motor 12 is under the operation control of starting and stopping by a pump control panel 24. The fire pump 10 driven by the motor 12 sucks the fire extinguishing water from a water source water tank 14 and supplies the pressurized fire extinguishing water to a main water supply pipe 18 arranged in the height direction of the building through a check valve 16.

[0027] A pressure tank 20 for starting is provided for the fire pump 10. The pressure tank 20 is connected to the main water supply pipe 18 through a pipe 25, and introduces the pressurized fire extinguishing water in the main water supply pipe 18 to compress the internal air. A pressure switch 22 is provided on the pressure tank 20. The pressure switch 22 detects a pressure reduction when the pipe pressure of the main water supply pipe 18 drops below a specified pressure and outputs a pressure reduction detection signal to the pump control panel 24, thereby driving the motor 12 to start the fire pump 10.

[0028] Branch pipes 26 are drawn from the main water supply pipe 18 for each protective compartment, for example, by floor, of the building. A flowing water detection device 28 is provided at the branch portion of the branch pipe 26, and a closed-type sprinkler head 30 is provided on the secondary side branch pipe 26 of the flowing water detection device 28. A fire detector 35 is installed in the protective compartment where the sprinkler head 30 is installed, and the detector line from the fire detector 35 is connected to a sprinkler control panel 36 through a fire alarm receiver 38. A terminal test valve 31 is provided at the end side of the branch pipe 26, and its secondary side is connected to a drain pipe 34 through an orifice 32.

[0029] The flowing water detection device 28 detects the flowing water when the sprinkler head 30 operates and discharges water due to a fire, outputs a flowing water detection signal to the sprinkler control panel 36, outputs a fire alarm, and displays the fire occurrence compartment where the sprinkler head 30 has operated.

[0030] An auxiliary pressure pump 40 is installed to assist in pressurizing the main water supply pipe 18 that supplies fire extinguishing water to the sprinkler head 30, and is driven by a motor 42. The motor 42 is subjected to operation control of start and stop by an auxiliary pressure pump control panel 52. The auxiliary pressure pump 40 driven by the motor 42 sucks fire extinguishing water from the water source water tank 14 and supplies the fire extinguishing water to the main water supply pipe 18 through a pipe 25 provided with a check valve 46.

[0031] A main pipe pressure detection switch 48 that functions as a first pressure detector is provided on the secondary side of the check valve 46. When the main pipe pressure P1 of the main water supply pipe 18 drops below or falls below a predetermined set pressure Pth1, the main pipe pressure detection switch 48 outputs a main pipe pressure drop detection signal to the auxiliary pressure pump control panel 52, and when the main pipe pressure P1 exceeds or becomes equal to or higher than the set pressure Pth1, the output of the main pipe pressure drop detection signal is stopped.

[0032] The auxiliary pressure pump control panel 52 that functions as a control unit starts the auxiliary pressure pump 40 when receiving a pressure drop detection signal from the main pipe pressure detection switch 48, and then performs control to stop the auxiliary pressure pump 40 when the reception of the main pipe pressure drop detection signal stops. Here, the set pressure Pth1 at which the main pipe pressure drop detection switch 48 that is used for starting and stopping the auxiliary pressure pump 40 turns on is set to a pressure higher than the specified pressure at which the pressure switch 22 of the pressure tank 20 that is used for starting the fire pump 10 turns on. main pipe

[0033] An auxiliary pressure operation detection switch 50 that functions as a second pressure detector is provided on the discharge side of the auxiliary pressure pump 40, which is the primary side of the check valve 46. The auxiliary pressure operation detection switch 50 detects that the discharge pressure of the auxiliary pressure pump 40 becomes equal to or higher than a predetermined set pressure Pth2 and outputs an auxiliary pressure operation detection signal to the auxiliary pressure pump control panel 52. Note that the set pressure Pth2 of the auxiliary pressure operation detection switch 50 is set to a value lower than the set pressure pth1 of the main pipe pressure detection switch 48.

[0034] ​During the reception of the auxiliary pressurization operation detection signal from the auxiliary pressurization operation detection switch 50, when the check valve 46 cannot be opened due to a sticking failure and auxiliary pressurization cannot be performed on the main water supply pipe 18, and the reception of the main pipe pressure drop detection signal from the main pipe pressure detection switch 48 continues for a period exceeding a predetermined time T, the auxiliary pressurization pump control panel 52 stops the operation of the auxiliary pressurization pump 40 and outputs an abnormal stop alarm through sound and display.

[0035] [b. Auxiliary Pressurization Pump Control Panel] The auxiliary pressurization pump control panel, which functions as the control unit of the auxiliary pressurization device, will be described in more detail. (b1. Configuration of the Control Unit) The configuration of the control unit will be described in more detail. Fig. 2 is a circuit diagram showing an embodiment of the control unit using the relay sequence provided in the auxiliary pressurization pump control panel.

[0036] As shown in Fig. 2, the control unit of the auxiliary pressurization pump control panel 52 includes a relay A activated by a main pipe pressure detection switch 48 that turns on when the main pipe pressure P1 drops below the set pressure Pth1, and a relay B activated by an auxiliary pressurization operation detection switch 50 that turns on when the discharge pressure P2 due to the start of the auxiliary pressurization pump 40 becomes equal to or higher than the set pressure Pth2. Relay A has normally open relay contacts a1, a2, and relay B has a normally open relay contact b1.

[0037] The normally open relay contact a2 of relay A and the normally open relay contact b1 of relay B are connected in series, and then a timer relay C is connected. The timer relay C operates when both the normally open relay contact a2 of relay A and the normally open relay contact b1 of relay B are closed, and opens the normally closed relay contact c1 when a predetermined time T has elapsed.

[0038] The normally closed relay contact c1 of the timer relay C is connected in series to the pump control unit 54 through the normally open relay contact a1 of relay A. Also, the normally open relay contact c2 of the timer relay C is connected in series to the parallel circuit of the abnormal display lamp 56 and the alarm buzzer 58. A lock-type alarm stop switch 60 is connected in series with the alarm buzzer 58.

[0039] Also, the normally open relay contact c3 of the timer relay C is connected in parallel with the series circuit of the normally open relay contacts a2 and b1 to form a self-holding circuit of the timer relay C. Further, a restoration switch 62 is connected in series with the timer relay C.

[0040] (b2. Auxiliary pressurization control) auxiliary The auxiliary pressurization control by the pressurization pump control panel 52 will be described in more detail. FIG. 3 is a time chart showing the main pipe pressure, discharge pressure, and operation waveforms of each part by the auxiliary pressurization control when the check valve opens normally. FIG. 3(A) shows the main pipe pressure P1 and the discharge pressure P2 of the auxiliary pressurization pump 40. FIG. 3(B) shows the operation of the main pipe pressure detection switch 48. FIG. 3(C) shows the operation of the auxiliary pressurization pump 40. FIG. 3(D) shows the operation of the auxiliary pressurization operation detection switch 50.

[0041] As shown in FIG. 3, when the main pipe pressure P1 of the water supply main pipe 18 decreases due to a temperature drop or the like in the protected area and drops to a predetermined set pressure Pth1 at time t1, the main pipe pressure detection switch 48 turns on, the relay A in FIG. 2 operates, and the normally open relay contact a1 closes, causing the pump control unit 54 to operate, and the auxiliary pressurization pump 40 is started at time t2.

[0042] When the auxiliary pressurization pump 40 is started, the check valve 46 is opened as the discharge pressure P2 rises. When the discharge pressure P2 reaches the set pressure Pth2 at time t3, the auxiliary pressurization operation detection switch 50 turns on. As a result, the relay B in FIG. 2 operates and the normally open relay contact b1 closes. Since the normally open relay contact a2 has already closed at time t1, the time-dependent operation of the timer relay C starts at time t2.

[0043] When the discharge pressure P2 increased by the start of the auxiliary pressurization pump 40 exceeds the main pipe pressure P1, the auxiliary pressurization for the water supply main pipe 18 becomes effective, and the main pipe pressure P1 begins to increase. The increasing main pipe pressure P1 exceeds the set pressure Pth1 at time t4 before reaching the set predetermined time T of the timer relay C. As a result, the main pipe pressure detection switch 48 turns off, and the relay A in FIG. 2 is restored.

[0044] When relay A is restored, the normally open relay contact a1 opens, and the operation of the pump control unit 54 stops, so that the auxiliary pressurizing pump 40 stops at time t5. Also, since the normally open relay contact a2 also opens, the timer relay C is restored and its operation over time stops. Furthermore, when the discharge pressure P2 falls below the set pressure Pth2 at time t6 due to the stop of the auxiliary pressurizing pump 40, the auxiliary pressurizing operation detection switch 50 turns off and relay B is restored, and the main pipe pressure P1 returns to the normal state where it is equal to or higher than the set pressure Pth1.

[0045] (b3. Auxiliary pressurization control when the check valve gets stuck) The auxiliary pressurization control when the check valve gets stuck will be described in more detail. Fig. 4 is a time chart showing the main pipe pressure, discharge pressure, and operation waveforms of each part by the auxiliary pressurization control when the check valve gets stuck. Fig. 4(A) shows the main pipe pressure P1 and the discharge pressure P2 of the auxiliary pressurizing pump 40, Fig. 4(B) shows the operation of the main pipe pressure detection switch 48, Fig. 4(C) shows the operation of the auxiliary pressurizing pump 40, Fig. 4(D) shows the operation of the auxiliary pressurization operation detection switch 50, Fig. 4(E) shows the operation over time of the timer relay C, and Fig. 4(F) shows the operation of the abnormality indicator lamp 56 and the alarm buzzer 58.

[0046] As shown in Fig. 4, when the main pipe pressure P1 of the water supply main pipe 18 decreases due to a temperature drop or the like in the protected area and drops to the set pressure Pth1 at time t1, the main pipe pressure detection switch 48 turns on, relay A in Fig. 2 operates, and the normally open relay contact a1 closes, so that the pump control unit 54 operates and the auxiliary pressurizing pump 40 is started at time t2.

[0047] Although the auxiliary pressurizing pump 40 is started, the check valve 46 does not open due to a stuck failure. Therefore, the discharge pressure P2 rapidly rises to the maximum pressure, and at time t3 during this process, the discharge pressure P2 reaches the set pressure Pth2 and the auxiliary pressurization operation detection switch 50 turns on. As a result, relay B in Fig. 2 operates and the normally open relay contact b1 closes. Since the normally open relay contact a1 is already closed at time t1, the operation over time of the timer relay C starts at time t3.

[0048] Without the main pipe pressure P1 recovering and when the elapsed time due to the time-dependent operation of the timer relay C reaches the predetermined time T at time t4, the timer relay C operates to open the normally closed relay contact c1, and the operation of the pump control unit 54 is stopped, so that the auxiliary pressurizing pump 40 is stopped at time t5. Also, when the normally open relay contact c3 closes, the timer relay C is self-held. Further, when the normally open relay contact c2 closes due to the operation of the timer relay C, the abnormality indicator lamp 56 lights up at time t4 and the alarm buzzer 58 sounds.

[0049] When the auxiliary pressurizing pump 40 is stopped at time t5, the discharge pressure P2 rapidly decreases. When the discharge pressure P2 falls below the set pressure Pth2 at time t6, the auxiliary pressurizing operation detection switch 50 turns off and the relay B recovers, opening the normally open relay contact b1. However, since the timer relay C is self-held when the normally open relay contact c3 closes, it does not recover.

[0050] Here, during construction or inspection, the alarm stop switch 60 may be off, and the acoustic alarm by the alarm buzzer 58 is not performed. However, since the abnormality indicator lamp 56 is lit, it can be easily understood that the auxiliary pressurizing pump 40 has stopped abnormally due to a sticking failure of the check valve 46 or the like, and measures such as replacing and repairing the check valve 46 can be taken. To recover the lit abnormality indicator lamp 56, the timer relay C may be recovered by turning off the recovery switch 62.

[0051] In this way, when starting the auxiliary pressurizing pump 40, if the main pipe pressure does not recover due to a sticking failure of the check valve 46, the auxiliary pressurizing pump 40 is forcibly stopped, and it is surely prevented that a failure occurs due to the auxiliary pressurizing pump 40 being continuously operated due to the sticking failure of the check valve 46.

[0052] [c. Other embodiments of the control function by the auxiliary pressurizing pump control panel] Another embodiment of the control function by the auxiliary pressure pump control panel will be described in more detail. As the auxiliary pressure control function by the auxiliary pressure pump control panel 52 shown in FIG. 1, in addition to the relay sequence circuit shown in FIG. 2, it can be realized by program control using a computer circuit.

[0053] Therefore, the control unit of the auxiliary pressure pump control panel 52 is a function realized by the execution of a program, and as hardware, a computer circuit including a CPU, a memory, and various input / output ports including an AD conversion port is used.

[0054] FIG. 5 is a flowchart showing the program control of the auxiliary pressure by the control unit of the auxiliary pressure pump control panel.

[0055] As shown in FIG. 5, the control unit of the auxiliary pressure pump control panel 52 determines in step S1 whether the main pipe pressure P1 is less than or equal to the set pressure Pth1 and whether the main pipe pressure detection switch 48 is turned on. When it is determined that the main pipe pressure detection switch 48 is turned on, it proceeds to step S2 and starts the auxiliary pressure pump 40.

[0056] Subsequently, when the control unit determines in step S3 that the discharge pressure P2 of the auxiliary pressure pump 40 has reached the set pressure Pth2 of the auxiliary pressure operation detection switch 50 and is turned on, it proceeds to step S4 and determines whether the main pipe pressure P1 has exceeded the set pressure Pth1 of the main pipe pressure detection switch 48 and is turned off. If it is determined in step S4 that the main pipe pressure detection switch 48 is turned on without exceeding the set pressure Pth1, it proceeds to step S5 and determines whether the elapsed time since the start of the auxiliary pressure pump 40 has reached the predetermined time T.

[0057] When the check valve 46 provided in the auxiliary pressure pump 40 is normally open, before the predetermined time T is reached in step S5, it is determined in step S4 that the main pipe pressure P1 has recovered to the set pressure Pth1 and the main pipe pressure detection switch 48 is turned off, and it proceeds to step S6 to stop the auxiliary pressure pump 40.

[0058] On the other hand, when the check valve 46 has a sticking failure, even if the auxiliary pressure pump 40 is started, the reduced main pipe pressure P1 will not recover, and the start of the auxiliary pressure pump 40 in step S5 or When it is determined that the elapsed time has reached the predetermined time T and the process proceeds to step S7, the auxiliary pressure pump 40 is stopped. Subsequently, the process proceeds to step S8, and an abnormal stop alarm of the auxiliary pressure pump 40 is output by turning on the abnormal display lamp and sounding the alarm buzzer.

[0059] Therefore, when the auxiliary pressure pump 40 is started, if the main pipe pressure does not recover to the specified pressure due to the sticking failure of the check valve, the auxiliary pressure pump 40 is forcibly stopped, and it is surely prevented that a failure occurs due to the continuous operation of the auxiliary pressure pump 40 caused by the sticking failure of the check valve 46.

[0060] [d. Modifications of the present invention] A modification of the auxiliary pressure device according to the present invention will be described in more detail. The auxiliary pressure device of the present invention includes the following modifications in addition to the above-described embodiment. (Sprinkler fire extinguishing equipment) The above embodiment takes the wet sprinkler fire extinguishing equipment in which the fire extinguishing water is filled in the main water supply pipe and the branch pipes as an example, but is not limited thereto. A pre-action valve device is provided at the branch portion of the branch pipe branched from the main water supply pipe, and the present invention can also be applied to an auxiliary pressure device for pre-action wet sprinkler fire extinguishing equipment that opens and operates the pre-action valve device by a fire signal from a fire detector to fill the secondary side branch pipe with pressurized fire extinguishing water.

[0061] (Pressure detection) In addition, in the above embodiment, the main pipe pressure drop and the discharge pressure are detected by a pressure detection switch, but the main pipe pressure and the discharge pressure may be detected by a pressure sensor to perform auxiliary pressure control.

[0062] (Others) In addition, the present invention includes appropriate modifications that do not impair its object and advantages, and is not limited by the numerical values shown in the above embodiment.

Explanation of reference numerals

[0063] 10: Fire pump 12, 42: Motor 14: Water source tank 16, 46: Check valve 18: Main water supply pipe 20: Pressure tank 22: Pressure switch 24: Pump control panel 25: Pipe 26: Branch pipe 28: Flow detection device 30: Sprinkler head 31: End test valve 32: Orifice 34: Drain pipe 35: Fire detector 36: Sprinkler control panel 38: Automatic fire alarm receiver 40: Auxiliary pressure pump 48: Main pipe pressure detection switch 50: Auxiliary pressure operation detection switch 52: Auxiliary pressure pump control panel 54: Pump control unit 56: Abnormality indicator lamp 58: Alarm buzzer 60: Alarm stop switch 62: Restoration switch A, B: Relay C: Timer relay a1, a2, b1, c2, c3: Normally open relay contact c1: Normally closed relay contact

Claims

1. An auxiliary pressurizing device in which an auxiliary pressurizing pump is connected via a check valve to a main water supply pipe that supplies fire extinguishing water to a sprinkler head, and the operation of the auxiliary pressurizing pump is started when the pressure of the main water supply pipe drops, and the operation of the auxiliary pressurizing pump is stopped when the pressure of the main water supply pipe recovers. When, after the pressure of the main water supply pipe drops and the operation of the auxiliary pressurizing pump is started, if it is detected that the pressure drop of the main water supply pipe continues from the pressure on the secondary side of the check valve for a predetermined time while detecting the discharge pressure of the auxiliary pressurizing pump that can open the check valve from the pressure on the primary side of the check valve, the operation of the auxiliary pressurizing pump is stopped. An auxiliary pressurizing device characterized by this.

2. An auxiliary pressurizing pump that auxiliary pressurizes a main water supply pipe that supplies fire extinguishing water to a sprinkler head, a check valve provided in a pipe connecting the auxiliary pressurizing pump to the main water supply pipe, provided on the secondary side of the check valve, and outputs a main pipe pressure drop detection signal when the pressure of the main water supply pipe drops below or falls below a predetermined pressure, and the main pipe pressure exceeds or becomes equal to or higher than the predetermined pressure. A first pressure detector that stops outputting the main pipe pressure drop detection signal, a control unit that starts the operation of the auxiliary pressurizing pump when receiving the main pipe pressure drop detection signal and stops the operation of the auxiliary pressurizing pump when the reception of the main pipe pressure drop detection signal stops, in an auxiliary pressurizing device provided with, a second pressure detector that detects the discharge pressure of the auxiliary pressurizing pump and outputs an auxiliary pressurizing operation detection signal is provided on the primary side of the check valve, The control unit is characterized in that when the reception of the main pipe pressure drop detection signal continues for a predetermined time while receiving the auxiliary pressurizing operation detection signal, the operation of the auxiliary pressurizing pump is stopped. An auxiliary pressurizing device.

3. In the auxiliary pressurizing device according to claim 2, the control unit is characterized in that when the operation of the auxiliary pressurizing pump is stopped, an abnormal stop alarm is output by sound and display. An auxiliary pressurizing device.

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