JP2014138647A - Fire pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire pump system capable of immediately continuing the operation in the same state as during an operation by a normal power source when power source is switched from the normal power source to an emergency power source.SOLUTION: A fire pump system includes: a fire pump; an inverter to drive the fire pump; a normal power source to supply power to the inverter; an emergency power source provided in parallel with the normal power source; a startup circuit to supply current of the normal power source and the emergency power source to the respective units; and a control device to output a frequency command signal to the inverter so that the pressure is a predetermined pressure value. The control device includes a non-volatile storage part for storing operation conditions when the fire pump is operated by the normal power source. The startup circuit includes a self-holding circuit for holding an energization circuit mechanically, and when power supply is switched from the normal power source to the emergency power source, the startup circuit supplies power to the respective units from the emergency power source through the self-holding circuit. The control device reads out the operation conditions stored in the storage part, and operates the fire pump.

Description

  The present invention relates to a fire extinguishing pump system corresponding to an emergency power source equipped with a variable speed driven pump applied to fire fighting water. The fire pump system here refers to an inverter-driven fire pump system including a fire hydrant pump system and a sprinkler pump system. Hereinafter, it is called a fire extinguishing pump system.

  Fire fighting pump systems must be quickly operated and watered in the event of a fire by means of fire detectors, discharge devices or man-made operations. For this reason, a pump and a system that have high reliability not only during operation of commercial power supply (normal power supply) but also during emergency power supply switching operation are required. Recently, with the widespread use of inverters, there is a trend to adopt inverters in fire pump systems. Of course, this inverter-driven fire pump system also needs to cope with the emergency power switching operation. There is Patent Document 1 as a known example of an inverter-driven fire extinguishing pump system.

  In the fire pump device of Patent Document 1, since the capacity of the emergency power supply is small, the switching from the normal power supply to the emergency power supply is detected when switching from the normal power supply to the emergency power supply due to the occurrence of a problem with the normal power supply. There is a description that when the emergency power supply is turned on, the rotational speed increase pattern is changed to a soft pattern. However, when switching from the normal power supply to the emergency power supply, a power-off state occurs for several seconds, and there is no description on how to deal with this with the fire pump device.

  In addition, the performance standards for fire fighting pump devices (standards for pressurized water supply equipment, Fire and Disaster Management Agency Notification No. 8) require that the operation state before switching the fire pump be maintained after switching from normal power to emergency power. It is necessary to cope with this.

JP 2006-20846 A

  As described above, Patent Document 1 does not describe how the fire extinguishing pump device responds to the occurrence of a power-off state of about several seconds when switching from the normal power source to the emergency power source. Therefore, the pump operation is interrupted during a power interruption of about several seconds, and there is a risk that the water supply pressure will drop and hinder fire fighting activities.

  In addition, it is highly possible that the operating status (pressure setting value, inverter operating frequency, etc.) information when operating the fire pump with a normal power supply during a power failure of several seconds will be lost. It is difficult to immediately operate in the same operation state as that of a normal power source, and there is a risk that fire fighting activities may be hindered.

  Furthermore, if the speed of the fire pump is suddenly increased after switching to the emergency power supply, an overcurrent will flow through the pump drive motor, causing the circuit breaker to trip, shutting off the power supply, and extinguishing the fire. May cause trouble.

  In order to solve the above-described problems, the present invention provides a fire extinguishing pump system that can immediately continue operation in the same state as during normal power supply operation when the normal power supply is switched to the emergency power supply.

In order to solve the above problems, the present invention provides a fire pump that feeds water from a water source to a water discharge means group provided on each floor of a water pipe terminal via a suction pipe, an electric motor that drives the fire pump, An inverter that drives the electric motor, a normal power source that supplies power to the motor and the inverter, an emergency power source that is provided in parallel with the normal power source, and a starting circuit that starts energization of each part of the normal power source and the emergency power source, Fire extinguishing pump system comprising pressure detecting means for detecting the water supply pressure on the discharge side of the fire extinguishing pump, and a control device for outputting a frequency command signal to the inverter so that the pressure detected by the pressure detecting means becomes a predetermined pressure value. In
The control device has a nonvolatile storage unit that stores an operation history, a pressure set value, and an inverter frequency when the fire pump is operating with the normal power source, and the starter circuit mechanically holds an energization circuit. A self-holding circuit that
When the power supply is switched from the normal power supply to the emergency power supply, the starter circuit supplies power to each part from the emergency power supply through the self-holding circuit, and the control device stores the operation history, pressure set value, and inverter stored in the storage unit. The frequency is read and the fire pump is operated.

  Further, in the fire pump system described above, the self-holding circuit has a set coil and a reset coil, mechanically holds the energizing circuit when the set coil side is excited, and energized circuit when the reset coil side is excited. It is characterized by opening.

  In the above-described fire pump system, the emergency power supply is provided with recognition means for recognizing emergency power supply operation and outputting a signal, and the control device recognizes when the power supply is switched from the normal power supply to the emergency power supply. The fire extinguishing pump is operated by reading the pressure set value and the inverter frequency stored in the nonvolatile storage unit based on the signal.

  Further, in the fire pump system described above, when the control device is switched to an emergency power source and the start condition is canceled and the self-holding circuit of the start circuit is released while the fire pump is in operation, the fire pump is operated. It is characterized by stopping.

  Moreover, in the fire pump system described above, a circuit breaker is provided between the power supplies and the inverter, and the circuit breaker has a tripless configuration during pump operation. To do.

  Further, in the fire pump system described above, an earth leakage relay with an alarm is provided between the both power supplies and the inverter, the trip current is not caused by an overcurrent during pump operation, and an alarm is issued at the time of an earth leakage. To do.

  According to the present invention, the non-volatile storage unit is provided in the control device, and the starter circuit is provided with the mechanical self-holding circuit. Therefore, the operation condition of the fire pump with the normal power source is stored in the storage unit. When the normal power source is switched to the emergency power source, the operation can be continued immediately under these operating conditions without the power source being cut off. In addition, if the emergency power source is provided with emergency power source recognition means, this quickness is further improved.

  Furthermore, since a circuit breaker without a trip element or an earth leakage relay is provided between the inverter and the power source, even if the fire pump is temporarily overloaded, it will not trip.

The system system | strain diagram of the Example of this invention applied to the sprinkler fire extinguishing equipment. The system system | strain diagram of the other Example of this invention applied to the fire hydrant fire extinguishing equipment. The pump performance curve figure of discharge pressure constant control for every floor of a present Example. The pump performance curve figure of the terminal pressure constant control of a present Example. The circuit diagram of the control panel of a present Example. The flowchart which shows the algorithm of the discharge pressure constant control of a present Example. The flowchart which shows the algorithm of the terminal pressure constant control of a present Example. The flowchart for demonstrating the control flow of a present Example. The detailed block diagram of the fire hydrant of a present Example.

  Embodiments of the present invention will be described below with reference to FIGS. The embodiment of the present invention includes a fire pump, an inverter that drives the fire pump, a normal power source that supplies power to the inverter, an emergency power source provided in parallel with the normal power source, a normal power source and an emergency power source in each of the above parts. A starting circuit for energizing and a control device for outputting a frequency command signal to the inverter so that the pressure becomes a predetermined pressure value, and the control device sets operating conditions when the fire pump is operating with the normal power source. The starting circuit has a self-holding circuit that mechanically holds an energization circuit, and the starting circuit is self-holding when the power supply is switched from the normal power source to the emergency power source. Power is supplied to each part from the emergency power supply through a circuit, and the control device reads an operation condition stored in the storage unit and operates a fire pump.

  FIG. 1 shows a system diagram in which a fire pump system according to an embodiment of the present invention is applied to a sprinkler fire extinguishing equipment for a building, and an example is 10 stories. 1 is a water source, for example, a fire extinguishing water tank. A sprinkler fire pump 4 is provided with a suction pipe 3 having a foot valve 2 attached to the tip thereof on the suction side, and supplies water to the water supply pipe 10. Hereinafter, it is abbreviated as a fire pump. The fire extinguishing pump 4 is provided with a pressure tank 14, a check valve 6, and a gate valve 7 having air accumulation inside on the discharge side.

  Reference numeral 9 is a pressure detecting means located in the vicinity of the pump and attached to the water pipe 10 and transmits an electric signal S11 corresponding to the detected pressure. The transmitted electrical signal S11 is received by the control panel 8 described later. In addition, the water supply pipe 10 includes sprinklers 10-1a to e to 10-3a to e in the water supply pipe branch pipes 10-1 to 10-3 for each floor to constitute a sprinkler group (water discharge means group). Yes. 10-1 s to 10-3 s are each a water discharge device that emits a water discharge signal when the sprinkler is opened, and is attached to a portion where the floor height can be specified in one-to-one correspondence with the sprinkler for each floor. For convenience, 10-1 s to 10-3 s is also used as the emission signal of the emission device. These signal groups are transmitted to the control panel 8 as S13.

  As will be described in detail later, the control panel 8 is supplied with power from a normal power supply and an emergency power supply, and includes an inverter, a control device, and the like. Power (variable frequency, variable voltage) is supplied to the motor 5 by the power cable S10. Supply. The signals 10-1s to 10-3s transmitted from the sprinklers (discharge devices) on each floor are positional information indicating which floor the floor has, and the floor is specified by this, and the water supply pressure (pressure setting) required for each floor Value), or an initial inverter frequency corresponding thereto, or a water supply pressure (pressure set value) required for each floor and an initial inverter frequency corresponding thereto are determined. Although not shown in the drawings, there may be a case where a jockey pump device is provided separately to constantly pressurize the water supply pipe to a predetermined pressure, and the jockey pump device may be omitted to replace the jockey pump function with a fire extinguishing pump. is there.

  FIG. 2 shows a system diagram in which an inverter-driven fire hydrant pump system according to another embodiment of the present invention is applied to a fire hydrant fire extinguisher in a building. The pressure tank shown in FIG. 1 is omitted, and the fire hydrant groups 10-1a to 10-3a and the start command signals 10-1s to 10-3s thereof are used instead of the sprinkler, the discharge device, and the discharge signal. The fire hydrant is pulled in by branch pipes 10-1 to 10-3 of the water supply pipe 10 as shown in FIG. 9, and includes a start pushbutton switch 22, a bell 23, a start display lamp 24, a hose 25, and a nozzle 26. . Then, when the start pushbutton switch 22 of the fire hydrant is operated, a start command signal 10-1s to 10-3s indicating that the start command is transmitted is transmitted.

  FIG. 3 is a performance curve diagram of the fire pump when the fire pump system shown in the system diagram of FIGS. 1 and 2 is operated at a predetermined pressure setting value for each floor, and the horizontal axis represents the discharge amount (m3 / Min), the vertical axis represents the total lift (m). The predetermined amount of water Q0 is the amount of water necessary for feeding water to a fire hydrant of a water pipe terminal, a sprinkler discharge device, etc. (hereinafter collectively referred to as a fire extinguishing device), and when displayed on a pump performance curve diagram It is shown as the discharge amount. In this embodiment, Q0 is handled constant, but a value that changes for each fire extinguishing device may be used.

  The pressure set value H010F is to the fire extinguishing equipment of the water pipe terminal on the 10th floor (in this embodiment, the highest place, the farthest, and if water can be sent here, water can be sent to other fire extinguishing equipment) It is the pressure setting value necessary for water supply, including resistance loss (R10 in the figure) of the water pipe and the like, the actual head (not shown), and the required end pressure (not shown) in the fire extinguishing device When displayed on the pump performance curve, it is shown as the total head. Further, if the point satisfying the predetermined water amount Q0 and the pressure set value H010F is the specification point O1, it is necessary to select a pump having the pump QH performance curve A obtained when operating at the inverter frequency f10. . That is, at the specification point O1, the pump performance curve A, the pressure set value H010F, and the water supply pipe resistance curve R10 intersect.

  Similarly, H09F is a pressure setting value required to feed a predetermined amount of water Q0 to the fire extinguishing appliances of the water pipe terminals on the 9th floor and H08F, respectively. Since the pressure setting value required to send water to the fire extinguishing equipment of each water pipe terminal less than the 8th floor is clear in the above description, the description is omitted. These pressure set values are set when a start command signal is transmitted from the fire extinguishing device of the water pipe terminal and the control panel 8 receives it.

  FIG. 4 is a performance curve diagram of the fire pump when the fire pump system shown in the system diagram of FIGS. 1 and 2 is operated with the terminal pressure constant control at the uppermost pressure setting value and the automatic inspection program. The discharge amount (m3 / min) is shown on the horizontal axis, and the total head (m) is shown on the vertical axis. What is indicated by the same symbol as in FIG. 3 is the same performance function, so the description is omitted. The reason for using the pressure setting value on the top floor is that when the start command signal is used from the fire extinguishing equipment of the water pipe terminal, the pressure setting value for each floor is determined correspondingly, but the water pressure is not used. When using this change, the pressure setting value for each floor is not fixed, so as shown in FIG. 4, the pressure setting value for the 10th floor (the highest and farthest in this embodiment, water can be sent here) If possible, water can be sent to other fire extinguishing equipment). The pressure setting value H010F means the upper limit setting value, H010FL is the lower limit setting value, and f12 is the inverter frequency thereof. These set values are stored in advance in a nonvolatile storage unit (described later). The nonvolatile storage unit referred to here is one in which data stored when the power is turned off is not lost.

  FIG. 5 is a circuit diagram of the control panel 8 described with reference to FIGS. In this figure, PW (R, S, T) is normally used for commercial power (normal power), PW (R, S, T), and emergency power is emergency. In this case, it is prepared in advance that the fire pump system can be operated by automatically detecting this and switching to the emergency power source by the changeover switch SW. RX is a relay as a recognition means for recognizing emergency power supply operation, and outputs a recognition signal when power supply is switched from a normal power supply to an emergency power supply.

  When switching from the normal power supply to the emergency power supply, a power-off state has occurred for several seconds. During this period, the inverter operating frequency, the control panel operation circuit (self-holding circuit), the control device ( Since information such as the pressure setting value (including the CPU and storage unit) is lost, it is necessary to take measures such as immediately recovering the operating state with the normal power source when switching to the emergency power source.

  R (or R1), S is a control power supply, MBV is a circuit breaker connected between both power supplies (normal power supply and emergency power supply) and the inverter, INV is an inverter having frequency setting means and an operation display section CONS , CU is a control device including a CPU, a storage unit M having a non-volatile storage unit (hereinafter, the non-volatile storage unit is referred to as a non-volatile storage unit for convenience of explanation), input / output interfaces I / O2, 3 and the like. In the non-volatile memory part M, as an operation condition (operation state) for operating the fire pump, a pressure set value and an inverter initial frequency, a pressure set value during operation and an inverter frequency, an operation history, water supply pressure data, and the like are stored. I remember it. The operation history is a flag, and is written, for example, 0FFH (the initial value is 00H. Therefore, it is 00H when not operating) after driving. In this way, it is possible to determine whether or not the pump has been operated with the normal power supply when the emergency power supply is switched.

  TR is a transformer, I / O1 is an input circuit unit for receiving start command signals 10-1S to 10-3S (corresponding to floor heights ... 8F to 10F) from a fire hydrant start switch or discharge device for each floor, X Is a relay contact group (... 8FX to 10FX, X1) that is turned on when the acquired start command signals 10-1S to 10-3S are turned on. I / O2 is an input / output interface unit, and signals of the relay contact group X (relays corresponding to the start command signals 10-1S to 10-3S..., 8FX to 10FX are input), and relays described later The X1 contact signal is fetched from here. Then, when performing constant discharge pressure control for each floor, relays corresponding to the start command signals 10-1S to 10-3S fetched from the input / output interface I / O2. A pressure set value is set based on the signals of 8FX to 10FX and is stored in the nonvolatile storage unit M.

  Instead of storing in the non-volatile storage unit M, the relays in the relay group X may be kept relays having the characteristics described later. Similarly, I / O3 is an input / output interface unit that takes in the signal S11 of the pressure detecting means, and outputs the signal A5 that is turned on to the relay X1 and the inverter frequency command signals AD0 and CM1 to the inverter INV. 52V is an electromagnetic relay, and IM is an electric motor. BS1 is a start pushbutton switch, BS2 is a stop pushbutton switch, and KP2 is a keep relay. These constitute a start circuit, and an energization circuit is formed by connecting the contact of the start pushbutton switch BS1 and the contact of the keep relay KP2 in parallel. A self-holding circuit that mechanically holds the motor is configured.

  The keep relay KP2 has a set coil (S) and a reset coil (R). When the set coil S side is energized, the contact (a contact) is closed and this state is maintained even when the power is cut off. maintain. In order to restore the closed contact, the reset coil R may be excited. The contact (a contact) is a contact of the keep relay KP2 connected in parallel with the start pushbutton switch BS1.

  The CPU of the control unit CU stores processing programs shown in the flowcharts of FIGS. 6, 7, and 8 to be described later.

  Next, a rough operation procedure and how the starting circuit (self-holding circuit) is not lost when the normal power supply is cut off will be described. In FIG. 5, it is assumed that the circuit breaker MVB for wiring is turned on.

  When the start pushbutton switch BS1 is pressed, the set coil S of the keep relay KP2 is excited to close the contact and self-hold the button switch BS1. At the same time, the relay 52V is excited to close the contact 52Va, and the inverter terminal FW and CM0 are turned on and the inverter INV starts operation. At this time, inverter frequency command signals (bidirectional) AD0 and CM1 are not transmitted from the control unit CU. Therefore, the inverter INV is set in advance with a frequency f10 (a frequency at which water can be supplied anywhere in the fire extinguishing equipment of the water pipe terminal), and the pump is operated at this frequency.

  Even after the power supply is restored by switching off the normal power supply and switching to the emergency power supply in this state, the energization circuit is mechanically held by the self-holding circuit, so that the frequency even if the start pushbutton switch BS1 is not pressed. The operation of the fire pump by f10 is maintained. In this way, even when the power supply is switched from the normal power supply to the emergency power supply, the starter circuit is mechanically held by the self-holding circuit and the power supply is maintained without being lost. Will continue without.

  When the stop pushbutton switch BS2 is pressed, the reset coil R of the keep relay KP2 is excited and the contact (a contact) is opened (returning to the old state), and the starting circuit is released. Is stopped (common to FIGS. 1 and 2). In this way, the operation of the fire extinguishing pump is stopped only when the stop push button switch BS2 is pressed, so that the operation of the pump is not inadvertently stopped during the fire extinguishing.

  When the start command signals 10-1s to 10-3s from the water pipe terminal fire extinguishing equipment for each floor are received, the signals are received by the input interface I / O1, and from the input / output interface I / O2 of the control unit CU. take in. The pressure setting value for each floor corresponding to the signal fetched from the input / output interface I / O2 and the inverter initial frequency are set and stored in the nonvolatile storage unit M. Subsequently, a signal A5 for turning on (exciting) the relay X1 is output from the input / output interface I / O3. The contact X1 of the relay X1 is closed and the pushbutton switch BS1 is self-held, the relay 52V is closed, and the contact 52Va turns on the inverter terminals FW and CM0. In addition, inverter frequency command signals (bidirectional) AD0 and CM1 (the set inverter initial frequency) are output from the control unit CU to start operation.

  And the discharge pressure fixed control by the pressure setting value for every floor demonstrated in detail later is implemented (FIG. 1, FIG. 2 is common). In this state, since the self-holding circuit is mechanically held even after the normal power supply is shut off and the power supply is restored by the emergency power supply, the control unit CU stores the operation history, the pressure set value, and the inverter frequency in a nonvolatile manner. The memory is maintained in M, these are read as appropriate, and immediately return to the operating state before the power is turned off.

  The nonvolatile storage unit M stores in advance pressure setting values H010F and H010FL and inverter frequencies f10 and f12 for constant terminal pressure control as functions or tables. Then, by reflecting the current frequency in this, a pressure setting value corresponding to this frequency can be obtained.

  In the example of FIG. 1, when the detected value of the water pipe pressure of the pressure detecting means 9 becomes H010FL or less with the operation of the sprinkler fire extinguishing equipment, a signal A5 for turning on the relay X1 is output from the input / output interface I / O3. . The contact X1 of the relay X1 is closed and the push button switch BS1 is self-held, the relay 52V is closed, and the contact 52Va turns on the inverter terminals FW and CM0. In addition, inverter frequency command signals (bidirectional) AD0 and CM1 (the set inverter frequency f12) are output from the control unit CU to start operation. Then, the terminal pressure constant control described later in detail is executed. Since the response when the power is cut off is clear in the above description, the description is omitted.

  In the example of FIG. 2, when a start command signal (no floor height information) 10-1s to 10-3s is received from a water pipe terminal fire extinguishing device, the signal is received by the input interface I / O1, and the control device Capture from the input / output interface I / O2 of the CU. As a result, a signal A5 for turning on the relay X1 is output from the input / output interface I / O3. The contact X1 of the relay X1 is closed and the push button switch BS1 is held by itself, the relay 52V is closed, and the contact 52Va turns on the inverter terminals FW and CM0. At the same time, inverter frequency command signals (bidirectional) AD0 and CM1 (inverter frequency f12) are output from the control unit CU to start operation. Then, the terminal pressure constant control described later in detail is executed. Since the response when the power is cut off is clear in the above description, the description is omitted.

  FIG. 8 is a flowchart showing main processing and pressure control processing (algorithm). Although not shown in the figure, the pressure setting value and the inverter initial frequency for constant discharge pressure control or the terminal pressure constant control and the inverter initial frequency are determined by initial processing and interrupt processing, and are nonvolatile. Store in the storage unit M. In the meantime, the middle part irrelevant to the intention of the invention is omitted.

  First, the operation of the normal power supply will be described with an example of discharge-by-floor discharge constant pressure control. For convenience of explanation, it is assumed that the start command is generated on the 10th floor. First, it is determined whether or not there is an operation history flag at 600A (the operation history flag is set to 0FFH when the operation processing is performed in steps 608 and 609, and 00H is set if the operation is not performed). Naturally, since it is not driving | running initially, it determines with NO and progresses from 611 steps to 600 steps. Steps 600 to 607 indicate processing for setting a pressure setting value for each floor. Check whether there is a start command in order from the top floor to the bottom floor, and determine and set the pressure setting value for the floor with the start command.

  In the embodiment, since the start command signal is transmitted from the 10th floor, if it is determined that there is an operation history in step 600A, the pressure set value H010F and the inverter initial frequency f10 (see FIG. 3) are stored in a nonvolatile manner in step 600B. It reads from the part M, proceeds to 600B, 600C, and 609A steps, executes an operation history flag set process and a pump operation process, and proceeds to a pressure control process of 610 steps.

  Here, the operation process of the pump refers to the start request signal 10FX based on the start command signal from the 10th floor from the input / output interface I / O2 to the control unit CU in FIG. 5, and the input / output interface I / O from the control unit CU. Speed command signals AD0 and CM1 (signals corresponding to the inverter initial frequency f10) are output to the relay X1 and the inverter via O3. In addition, the contact point of the relay X1 is closed to form a starting circuit, and the inverter terminals FW and CM0 are turned on by the contact point 52Va of the relay 52V to operate the fire pump.

  In step 610, first, the discharge pressure constant control for each floor shown in FIG. 6 will be described. Here, as described above, the pressure set value is set to H010F, and the inverter initial frequency is set to f10. In step 500 of FIG. 6, the pressure detection means detects the water supply pressure H (uses the symbol H for convenience), and in step 501 uses the water supply pressure H and the pressure set value H0 (uses the symbol H0 for convenience). (H0 = H010F). As a result of comparison, if H0−α> H, the process proceeds to step 502, and after executing the inverter speed increase control process, in step 505, the process of storing the inverter frequency after speed increase in the nonvolatile storage unit M is executed. Return to step 500.

  If the determination in step 501 is H0 + α <H, the process proceeds to step 503, and after executing the inverter deceleration control process, in step 506, the process of storing the inverter frequency after deceleration in the nonvolatile storage unit M is performed. Return to step 500. If the determination in step 501 is H0−α <= H <= H0 + α, the process proceeds to the next step 614. Thereafter, by continuing the above-described processing, the water supply pressure detected by the pressure detection means becomes equal to the pressure setting value (read out from the nonvolatile storage unit M) for each floor. Α indicates a dead time of the target pressure and is approximately 1 to 2 m, and a indicates a shift control width of the inverter and is appropriately set to 0.1 to 1 Hz.

  Next, the terminal pressure constant control will be described with reference to FIG. In this control, if the processing of steps 602 to 607 in FIG. 8 is deleted or only the processing of steps 600 and 601 is executed, the pressure setting value of the top floor (10th floor) is set. The processing of the step can be executed as constant terminal pressure control in FIG. In FIG. 7, the processes indicated by the same step symbols as those in FIG. 6 will not be described for the same processes as in FIG. 6. The process of step 504 in FIG. 7 is a process of updating the pressure set value after the pressure set value matches in step 501. The pressure set value is a pipe resistance curve R10 shown in FIG. 4 and is expressed as a function or a table and is obtained based on the current inverter frequency. That is, when the process of FIG. 7 is executed, the terminal pressure constant control is obtained.

  Next, a first embodiment of the processing when the normal power supply is switched to the emergency power supply will be described. If NO is determined in step 600A in FIG. 8, the process proceeds to step 611 and subsequent steps (the description is omitted because it has been described above). When switching to the emergency power supply, if it is determined as YES (indicating that the operation history flag is set to 0FFH) in the processing of step 600A, the processing proceeds to step 600B. At this step (steps 609 and 609A), the pressure setting value and inverter frequency stored in the non-volatile storage unit M are read, the operation history is reset (set to 00H) at step 600C, and the operation processing at step 609A is performed. Proceed to If it does in this way, it can return to the same operation state as the operation state before interception of normal power supply immediately. The reason why the operation history reset process is executed in step 600C is to prepare for the initial operation state after the stop process in steps 614 to 616 is executed.

Next, a second embodiment will be described. This is because the relay RX for recognizing that the emergency power supply is in operation is provided in FIG. 5, and the nonvolatile storage is performed based on the recognition signal output from the relay RX when the power supply is switched from the normal power supply to the emergency power supply. The pressure set value stored in the part M and the inverter frequency are read out, and the state immediately shifts to the same state as the operation state with the normal power source. Specifically, the process of step 600A in FIG. 8 may be changed to a process of determining whether the relay RX of the recognition unit is operating (outputting a recognition signal). Also, the processing of 600C and 609 steps can be omitted. If it carries out like this, after determination of 600A step, the process of 600B and 609A step can be performed, and it can return to the driving | running state before a normal power supply interruption | blocking immediately. If the relay RX of the emergency power supply recognition means is provided in this way, the quickness of the return to the operation state before the normal power supply is cut off is further improved. Further, after switching from the normal power supply to the emergency power supply, the fire pump is in operation. When the starting condition is released and the stop pushbutton switch is pressed, the self-holding circuit of the starting circuit that has been mechanically held is released and stopped. That is, in FIG. 5, the stop pushbutton switch BS2 has a structure having an a contact and a b contact, the set coil S of the keep relay KP2 is released by the b contact, and the reset coil R of the keep relay KP2 is operated by the a contact. The mechanical self-holding circuit of the starting circuit is released by energizing and resetting.

  Furthermore, a circuit-less circuit breaker MBV may be provided between the inverter drive circuit and both power supplies (normal power supply and emergency power supply) so as to be tripless (not tripped) during operation. That is, when switching from the normal power supply to the emergency power supply, there is a high possibility that an overcurrent will flow through the wiring breaker MBV in an attempt to start up the fire pump early, but in FIG. Since the tripping element is configured to eliminate the tripping element that operates due to overcurrent, the circuit breaker MBV is not tripped even if the main power supply circuit is overloaded (the main power supply circuit is not shut off), and fire Prioritize the operation of the fire pump when it occurs.

  Further, the above embodiment is further improved, and an alarm leakage relay (tripless structure) may be provided in place of the element-less wiring breaker MBV. In other words, the leakage relay enables trip-less maintenance at the time of overcurrent and preventive maintenance by issuing a notification at the time of leakage. An alarm is issued when main power leakage or main power overcurrent occurs.

  As described above, the embodiment of the present invention includes a fire pump that feeds water from a water source to a water discharge means group provided on each floor of a water pipe terminal via a suction pipe, an electric motor that drives the fire pump, An inverter that drives the motor, a normal power source that supplies power to the motor and the inverter, an emergency power source provided in parallel with the normal power source, a start circuit that energizes each part of the normal power source and the emergency power source, and the fire extinguishing In a fire extinguishing pump system comprising a pressure detection means for detecting a water supply pressure on the pump discharge side, and a control device for outputting a frequency command signal to the inverter so that the pressure detected by the pressure detection means becomes a predetermined pressure value, The control device includes a nonvolatile storage unit that stores an operation history, a pressure set value, and an inverter frequency when the fire pump is operating with the normal power source. The starting circuit has a self-holding circuit that mechanically holds an energization circuit, and when the power supply is switched from the normal power source to the emergency power source, the starting circuit feeds power from the emergency power source to each part through the self-holding circuit, The control device reads an operation history, a pressure set value, and an inverter frequency stored in the storage unit, and operates the fire extinguishing pump.

  DESCRIPTION OF SYMBOLS 1 ... Water source, 2 ... Foot valve, 3 ... Suction pipe, 4 ... Fire extinguishing pump, 5 ... Electric motor, 6 ... Check valve, 7 ... Partition valve, 10 ... Water supply pipe, 10-1 to 10-3 ... Water supply pipe branch Pipe, 8 ... Control panel, 9 ... Pressure detection means, 10-1a to e to 10-3a to e ... Water discharge means group (fire hydrant or water discharge device), 10-1S to 10-3S ... Start command signal, S10, S11 , S13 ... Control panel exchange signal, INV ... Inverter, BS1, BS2, KP2 ... Start circuit, BS1 contact, KP2 contact ... Self-holding circuit, CU ... Control device, M ... Non-volatile storage, S ... Set coil , R ... reset coil, RX ... recognition means (relay), MBV ... circuit breaker for wiring.

Claims (6)

A fire extinguishing pump that feeds water from a water source to a water discharge means group provided on each floor of a water pipe terminal via a suction pipe, an electric motor that drives the fire extinguishing pump, an inverter that drives the electric motor, and the electric motor A normal power supply for supplying power to the inverter, an emergency power supply provided in parallel with the normal power supply, a start circuit for energizing the respective parts with the normal power supply and the emergency power supply, and a pressure for detecting the water supply pressure on the discharge side of the fire pump In a fire extinguishing pump system comprising a detection means and a control device that outputs a frequency command signal to the inverter so that the pressure detected by the pressure detection means becomes a predetermined pressure value,
The control device has a nonvolatile storage unit that stores an operation history, a pressure set value, and an inverter frequency when the fire pump is operating with the normal power source, and the starter circuit mechanically holds an energization circuit. A self-holding circuit that
When the power supply is switched from the normal power supply to the emergency power supply, the starter circuit supplies power to each part from the emergency power supply through a self-holding circuit, and the control device stores the operation history, pressure set value and A fire extinguishing pump system characterized by reading out the inverter frequency and operating the fire extinguishing pump. In the fire pump system according to claim 1,
The self-holding circuit has a set coil and a reset coil, mechanically holds the energizing circuit when the set coil side is excited, and opens the energizing circuit when the reset coil side is excited. . The fire pump system according to claim 1 or 2,
Recognizing means for recognizing emergency power supply operation and outputting a signal to the emergency power supply is provided, and when the supply of power is switched from the normal power supply to the emergency power supply, the control device stores in the nonvolatile storage unit based on the recognition signal. A fire extinguishing pump system that operates a fire extinguishing pump by reading a stored pressure setting value and an inverter frequency. In the fire pump system according to any one of claims 1 to 3,
A fire extinguishing pump system characterized in that the control device switches to an emergency power source and stops the operation of the fire extinguishing pump when the start condition is canceled and the self-holding circuit of the starting circuit is released while the fire extinguishing pump is in operation. In the fire pump system according to any one of claims 1 to 4,
A fire-extinguishing pump system, wherein a wiring breaker is provided between the power supplies and the inverter, and the wiring breaker has a tripless configuration during pump operation. In the fire pump system according to any one of claims 1 to 5,
A fire-extinguishing pump system characterized in that an earth leakage relay with an alarm is provided between the both power sources and the inverter, tripping is not performed due to an overcurrent during pump operation, and an alarm is issued at the time of the earth leakage.

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