JP2014091018A - Fire hydrant pump system and method for controlling fire hydrant pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable quick fire extinction by causing a pressure of a fire hydrant to rise steeply when a start switch of the fire hydrant is operated in the event of a fire.SOLUTION: A fire hydrant pump system includes a fire hydrant pump for sending water from a water source to a fire hydrant provided on each floor on a demand side through a water pipe; an inverter for driving the fire hydrant pump; pressure detection means for detecting a pressure on a fire hydrant pump discharge side; a start switch disposed on the fire hydrant for transmitting a start command signal; and frequency control means for, responding to a signal of the signal transmission means, setting a target pressure for each floor from a pipe resistance curve obtained for each floor beforehand, and a corresponding assumed frequency, and outputting a frequency command signal to the inverter so that the pressure detected by the pressure detection means is the target pressure, so as to control the pump. At the initial start time of the pump, the frequency control means outputs the assumed frequency to the inverter.

Description

  The present invention relates to a fire hydrant pump system including a pump driven at a variable speed, and a control method for the fire hydrant pump system.

  Fire hydrant pump systems must be quickly operated and pumped by fire detectors or man-made operations in the event of a fire. For this reason, a highly reliable system is required for water supply, but an inverter-driven fire hydrant pump system has been rarely used in the past. However, with the widespread use of inverters, there is a trend to adopt inverters in fire hydrant pump systems. As these known examples, there are Patent Document 1 and Patent Document 2.

  In the fire fighting system (sprinkler) of Patent Document 1, for example, in paragraph (0025), “Pressurized water supply device 4 includes two pumps driven by motors. The number of rotations of the motor that drives the pump is controlled based on the pressure control signal from the device 5 so that the water supply pressure is set to a predetermined value, and the pressurized water supply device 4 controls the amount of water supplied from the control device 5. Based on the signal, the number of pumps to be activated is changed, so that the water supply amount is set to a predetermined value.

  Although the present invention does not limit the method of controlling the rotational speed of the motor that drives the pump, the rotational speed of the motor that drives the pump is controlled by a VVVF inverter (Variable Voltage Variable Frequency Inverter) that directly varies the rotational speed. : Variable voltage variable frequency inverter) etc. Is disclosed. In line 20 of paragraph (0022), the pressure signal. The water supply pressure based on the water supply control signal. It is stated that the amount is controlled. This is not shown, but a pressure sensor and a flow rate sensor are attached to the water pipe, and the pressure signal. This suggests that the frequency control is performed by the inverter so that the data detected by the pressure sensor and the flow rate sensor becomes the target value with the water supply amount control signal as the target value.

  Further, in the fire pump device of Patent Document 2, the setting of the target pressure in the paragraph (0040) is performed by storing a plurality of values in the control device 40 in advance, and from the automatic alarm device of the section where the sprinkler head 50 is opened. Although there is a disclosure that a pressure control operation is performed by selecting a required target pressure setting value based on the signal of (2), a plurality of values (target pressures PA, PB) are stored, but the floor number and the target pressure are one-to-one. It is not memorized corresponding to. Even if a signal comes from any rank, the values of the target pressures PA to PB are always selected, and the rank and the target pressure are not selected in a one-to-one correspondence.

JP 2005-253532 A JP 2006-20846 A

  However, according to the fire fighting system and the fire extinguishing pump device described in Patent Literature 1 and Patent Literature 2, the discharge device that discharges the fire extinguishing material is specified based on the release signal, and the water supply pressure is supplied to the pressurization device based on this. A control signal and a water supply amount control signal are to be transmitted, and a plurality of target pressures are to be stored in the storage unit, but the storage unit of the pressurizing device has a specified discharge device (floor height). There is no disclosure of storing a plurality of corresponding target pressures and selecting the target pressures from the stored target pressures based on the release signal. Furthermore, there is no disclosure of application to a fire hydrant system.

  In the fire hydrant, water pressure is not normally applied when no fire is occurring, and the pump starts when the operation switch of the fire hydrant attached to the water pipe terminal is operated in the event of a fire. Furthermore, since the water pressure discharged from the fire hose of the fire hydrant is orders of magnitude greater than the water pressure of the sprinkler, it cannot be directly applied to a system using the above-described sprinkler to which water pressure is constantly applied. The fire hydrant also takes time to reach a large predetermined pressure from the switch operation with respect to the sprinkler system to which water pressure is constantly applied.

  In addition, since the water pressure discharged from the fire hose is large as described above, for example, when water is supplied to the fourth floor, when the pressure is increased when water is supplied to the fourth floor, the piping, fire hose, and There is a possibility that the connecting portion cannot withstand pressure and burst. Therefore, it is required to accurately set the pressure supplied to each floor.

  The purpose of the present invention is to quickly extinguish the fire hydrant pressure when the start switch of the fire hydrant attached to the water pipe terminal is operated in the event of a fire, and the pressure supplied to each floor It is an object to provide a fire hydrant pump system and a control method for the fire hydrant pump system that can set water accurately and supply water safely.

In order to achieve the above object, the present invention provides a fire hydrant pump for feeding water from a water source to a fire hydrant provided on each floor on the demand side via a water pipe,
An inverter for driving the fire hydrant pump;
Pressure detecting means for detecting the pressure on the discharge side of the fire hydrant pump;
A start switch installed on the fire hydrant for transmitting a start command signal based on an operation;
Corresponding to the signal of the signal transmitting means, setting means for setting an assumed frequency corresponding to the target pressure for each floor from the piping resistance curve obtained in advance for each floor;
A frequency control means for controlling a pump frequency by outputting a frequency command signal to the inverter so that the pressure detected by the pressure detection means becomes a target pressure set by the setting means;
The frequency control means outputs the assumed frequency to the inverter when the pump is initially started.

  In the fire hydrant pump system described above, the frequency control means controls the inverter to rise to an assumed frequency at the time of initial startup, and the discharge pressure is controlled to be constant.

  The fire hydrant pump system described above is characterized in that the frequency control means controls the inverter to rise to an assumed frequency within a range where no overcurrent trip occurs.

  Further, in the fire hydrant pump system described above, when the start switch of the fire hydrant is operated and a signal indicating that the start push button switch of the fire hydrant of the plurality of floors is operated by the signal transmitting means, the frequency The control means controls the pump frequency by outputting a frequency command signal to the inverter so that the pump frequency reaches a preset maximum frequency.

  Further, in the fire hydrant pump system described above, when the pressure detected by the pressure detection unit becomes a predetermined value or less, the frequency control unit sets the frequency of the pump to a preset maximum frequency. Further, a frequency command signal is output to the inverter to control the pump frequency.

  Further, in the fire hydrant pump system described above, a control panel that houses the frequency control means is further provided, and when the pump is operated by the frequency control means based on operation of a start switch, The pump is stopped only by switching a switch provided in the control panel.

  Further, in the fire hydrant pump system described above, a start relay panel is further interposed between the fire hydrant and the control panel, and a communication unit is mounted on the start relay panel and the control panel, via the communication unit. A signal from a signal transmission means of a fire hydrant installed on each floor is transmitted to the control panel.

  In addition, in the fire hydrant pump system described above, communication means are mounted on the fire hydrant installed on each floor and the control panel, and the fire hydrant installed on each floor is identified and the target pressure set for this is set by exchanging signals between the two. Features.

  In addition, in the fire hydrant pump system described above, wireless communication means are installed in the fire hydrant installed on each floor and the control panel, and the fire hydrant installed on each floor is identified and the target pressure set for this is set by exchanging signals between the two. It is characterized by.

In order to achieve the above object, the present invention provides a fire hydrant pump for feeding water from a water source to a fire hydrant provided on each floor on the demand side through a water pipe, an inverter for driving the fire hydrant pump, and the fire hydrant pump. Pressure detection means for detecting the pressure on the discharge side, and frequency control for controlling the inverter so that the pressure detected by the pressure detection means based on the operation of the start pushbutton switch of the fire hydrant becomes a preset target pressure In a method for controlling a fire hydrant pump system comprising means,
A start command signal is transmitted based on the operation of the start switch of the fire hydrant;
Based on the start command signal, reading the target pressure and the assumed frequency from the pipe resistance curve obtained in advance for each floor;
The frequency control means controls the inverter so as to rise to an assumed frequency at the time of initial start, and also controls the discharge pressure to be constant.

  According to the present invention, in the event of a fire, when the start switch of the fire hydrant attached to the water pipe terminal is operated, the pressure of the fire hydrant rises sharply, and water is supplied to the fire hydrant with a more reliable and accurate pressure. Quick fire extinguishing is possible. Furthermore, it is possible to supply water safely by accurately setting the pressure supplied to each floor.

1 is a system diagram of an inverter-driven fire pump system according to an embodiment of the present invention. It is a pump performance curve figure at the time of similarly performing discharge pressure constant control (example of feed water pressure constant value control). It is the circuit diagram of a control panel similarly. It is a pump performance curve figure for demonstrating the discharge pressure fixed control at the time of discharge | release of a fire hydrant. It is a flowchart which shows the algorithm of discharge pressure constant control. It is a figure for demonstrating the control flow of an Example of this invention. It is detail drawing of a fire hydrant.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a system diagram of the inverter-driven fire hydrant pump system of this embodiment, illustrating the fourth floor below and the second floor above ground. In order to simplify the explanation, the illustration of the third floor and above is omitted.

  1 is a water source, for example, a fire extinguishing water tank. A fire hydrant pump 4 is provided with a suction pipe 3 having a foot valve 2 attached to the tip thereof on the suction side and feeds water to the water supply pipe 8. The pump 4 is provided with a check valve 6 and a gate valve 7 on the discharge side. Reference numeral 10 denotes a pressure detecting means located near the pump and attached to the water supply pipe 8, and transmits an electric signal S1 corresponding to the pressure. The transmitted electrical signal S1 is received by the control panel 9 described later.

  Further, the water supply pipe 8 is provided with fire hydrants 11a to 11f for each floor, and these fire hydrants are pulled in by branch pipes 8a to 8f of the water supply pipe 8, as shown in FIG. A start indicator lamp 24, a hose 25, and a nozzle 26 are installed. Then, when the start push button switch 22 of the fire hydrant is operated, start command signals S3a to S3f indicating that the start command is transmitted are transmitted. Here, the subscript a corresponds to the fourth basement level, b corresponds to the third basement level, c corresponds to the basement level 32, d corresponds to the first basement level, e corresponds to the first floor level, and f corresponds to the second floor level. These start command signals S3a to S3f are received by the start relay panel 32, and start command signals S2a (= S3a), S2b (= S3b)... S2f (= S3f) are transmitted to the control panel 9.

  As will be described in detail later, the control panel 9 incorporates an inverter, a control device (frequency control means) and the like, and supplies electric power (variable frequency, variable voltage) to the electric motor 5 through the power cable S0. These start command signals transmitted from the fire hydrants on each floor are positional information indicating which floor it is, and this floor is specified thereby to determine the necessary water supply pressure (target pressure) for each floor.

  FIG. 2 is a pump performance curve diagram when the fire hydrant pump is a system shown in FIG. 1 and the discharge pressure constant control for each floor is performed by an inverter. The horizontal axis indicates the amount of water supply, and the vertical axis indicates the water supply pressure (head). H04F is a water supply pressure (head) necessary to feed a predetermined amount of water Q0 to the fire hydrant on the fourth floor, and is a target value. Similarly, H0B3F and H0B4F are water supply pressures (heads) necessary for supplying a predetermined amount of water Q0 to the fire hydrants on the third and fourth basement floors, respectively, and are target values. Necessary water supply pressures (heads) from the 2nd to 3rd floors have the same meaning although not shown.

  In this way, in this embodiment, a water supply pressure head (target pressure) necessary for supplying water for each floor under a predetermined water supply amount is set in advance. By controlling the frequency of the inverter and driving the pump so as to achieve this target pressure, it is possible to reliably and accurately supply water every floor when a fire occurs.

In FIG. 2, a curve H indicates the performance of the pump QH when the inverter frequency is operated at f0B4F. This frequency f0B4F is a frequency necessary for producing the target pressure H0B4F when it is necessary to feed a predetermined amount of water Q0 when water is fed to the fire hydrant on the fourth floor underground.

Curve A is the pump QH performance when the pump is operated at the inverter frequency f04F.
Similarly, this frequency f04F is a frequency necessary for producing the target pressure head H04F necessary for supplying a predetermined amount of water Q0 when water is supplied to the fire hydrant on the fourth floor above the ground. Similarly, curves B to H are pump Q-H performances when the pump is operated by changing the inverter frequency from f03F to f0B4F (f03F >> f0B4F), respectively, and f03F to f0B4F are respectively from the 3rd floor to the 4th floor. This frequency is necessary when water is supplied to the fire hydrant.

  As will be described later, these frequencies are design values, and if the discharge pressure constant control is performed so that the target pressure for each floor is equal to the pressure detected by the pressure detection means, the frequencies will fluctuate up and down.

  In the present embodiment, a pipe resistance curve serving as a target pressure for each floor is obtained in advance, and the frequency of the pump is controlled by an inverter in accordance with this. For example, when water is supplied to a fire hydrant on the third floor above the ground, the target pressure necessary to supply the predetermined amount of water Q0 is obtained as H03F from the pipe resistance curve R03F. Therefore, the pump frequency is assumed to be H03F in advance. Assume f03F. Thus, by setting an appropriate target pressure and assumed frequency, it is possible to perform accurate water supply with a reliable and steep rise.

Also. If the pressure is increased to a pressure higher than the necessary pressure, for example, when water is supplied to the fourth floor underground, if the pressure is increased to the pressure required when water is supplied to the fourth floor above ground, the piping may not withstand the pressure and may burst. There is. According to the present embodiment, as described above, it is possible to safely supply water to each floor with an appropriate pressure, so that it is possible to provide a highly reliable fire hydrant pump unit that prevents explosion.

  In addition, when water is supplied at the same pressure regardless of the floor at which the fire will occur without using an inverter, it is necessary to provide a pressure reducing valve in the pipe in order to prevent the pipe from bursting. However, the pressure once increased by this pressure reducing valve is used to supply water, and there is a problem that the efficiency is very poor. Further, since some pressure reducing valves are expensive, there is a problem of cost. On the other hand, according to the present embodiment, since a predetermined water amount Q0 is ensured assuming a pipe resistance curve, and the water supply pressure (target pressure) of the fire hydrant for each floor is set, appropriate pressure constant control can be performed. This makes it possible to provide a fire hydrant pump unit that is economically advantageous.

  Curve A is the pump QH performance when the pump is operated at an inverter frequency f of 100% (100% frequency). In the present embodiment, the f04F having the 100% frequency is set as an assumed frequency of the pump when water is fed to the fourth floor fire hydrant. Curve R0B4F is a pipe resistance curve when water is sent to the fourth floor underground. Similarly, curves R0B3F to R04F are piping resistance curves when water is supplied from the third basement to the fourth floor above ground.

When the discharge pressure constant control is performed, the corresponding relationships among each floor start command signal, target pressure, inverter frequency (assumed frequency), pump performance, and resistance curve are as follows.
Each floor start command signal Target pressure Inverter frequency Pump performance Resistance curve S3h (4F) H04F f04F A R04F
S3g (3F) H03F f03F B R03F
S3f (2F) H02F f02F C R02F
S3e (1F) H01F f01F D R01F
S3d (B1F) H0B1F f0B1F E R0B1F
S3c (B2F) H0B2F f0B2F F R0B2F
S3b (B3F) H0B3F f0B3F G R0B3F
S3a (B4F) H0B4F f0B4F H R0B4F

  For example, when the start command signal S3a is transmitted from the fire hydrant on the fourth basement floor (B4F), the target pressure H0B4F is selected by this, and the pump is operated at a constant discharge pressure by the inverter. This control method will be described in detail with reference to FIGS. FIG. 4 shows a pump performance curve for explaining the constant discharge pressure control when the target pressure when water is supplied to the fire hydrant on the fourth floor underground is H0B4F. 5 and 6 are flowcharts showing the main processing and processing (algorithm) for discharging pressure constant control for each floor.

  Although not shown, the target pressure and the assumed frequency of each floor are input in advance by initial processing and interrupt processing, and are stored in the storage unit M (described later). In FIG. 6, the middle of irrelevant to the intention of the invention is omitted, but the process of reading the target pressure and the assumed frequency of each floor from the storage unit M is executed in steps 600 to 607. Check whether there is a start command in order from the top floor to the fourth basement floor, and read the target pressure and assumed frequency for the floor with the start command.

  For example, in step 602, it is determined whether the start pushbutton switch of the fire hydrant on the second floor is operated and the start command signal S3f (= S2f) is not transmitted. If it is transmitted, the process proceeds to step 603 to read out the target pressure H02F and the assumed frequency f02F. If not transmitted, the process proceeds to step 604 and the subsequent steps, and the first floor target pressure reading process is executed. The processing for reading out the target pressures on the other floors is the same as described above, and will not be described. If it is determined in step 600 to step 607 that there is no fire hydrant start command signal for each floor, the process returns to step 600 and continues from there.

  Next, in step 608, it is determined whether the pump is operating. If the operation is in progress, the process proceeds to step 610. If the operation is stopped, the operation process is executed in step 609, and the process proceeds to step 610. The assumed frequency is involved in the starting operation from the stop in step 609, which will be described later. In step 610, the process of constant discharge pressure control shown in FIG. 5 is executed.

  For convenience of explanation, in the above-described target pressure and assumed frequency reading process in steps 600 to 607, the target pressure H0 = H0B4F and the assumed frequency f0B4F are read by taking the fourth basement floor (B4F) as an example. To do. The read target pressure and assumed frequency are temporarily stored in the memory M of the control unit CU, for example.

  In FIG. 5, in step 500, pressure data H of the feed water pressure is detected by the pressure detection means 10. In step 502, the target pressure H0 (H0B4F) is compared with the detected pressure data H. If H0-α> H, the inverter acceleration control process is executed in step 501 and then the process returns to step 500. If H0−α <= H <= H0 + α at this time, the process proceeds to the next step 611, which is omitted in FIG.

  If H0 + α <H, the process proceeds to step 503, and after the inverter deceleration control process is executed, the process returns to step 500. By repeating this, the feed water pressure becomes substantially equal to the target pressure H0 (= H0B4F). Α indicates the dead time of the target pressure and is approximately 1 to 2 m, and a indicates the shift control width of the inverter and is appropriately set at 0.1 to 1 Hz. As a result of this control, the inverter frequency swings up and down in FIG. 4, and the inverter frequency approaches the design value (assumed frequency) f0B4F. Actually, the pipe resistance is different from the design value, and the predetermined quantity such as frequency and Q0 does not match the design value. However, priority is given to controlling the discharge pressure to the target value, which is fully practical. Can achieve a certain level.

  The pump performance curve at this time is H, and the resistance curve that becomes the target pressure when water flows from the pump to the fourth floor underground is R0B4F. In the present embodiment, the water supply amount when water is supplied to the fire hydrant is Q0. In addition, although the amount of water supplied to the fire hydrants on all floors is Q0, it may be changed depending on the number of floors.

The operating point of the pump is determined by the intersection OH between the pump performance curve H and the resistance curve R0B4F. The target pressure at this time is determined by reading the intersection OH with the feed water pressure on the vertical axis. The water supply amount Q0 is obtained by reading the intersection OH with the water supply amount on the horizontal axis. The frequency of the pump that satisfies the water supply amount and the target pressure is determined in advance so that the operating point OH determined in this manner is obtained.

  Considering the water supply to the fire hydrant in the event of a fire, it is desirable that the water supply pressure of the fire hydrant suddenly reaches the target pressure from zero pressure. For this reason, when the target pressure is read in steps 601, 603, and 605 in FIG. 6, the assumed frequency is also read, and the assumed frequency is output during the initial operation process at the start of the pump in step 609. Specifically, as will be described later, signals S1, S2, S3, S4, and CM2 are output from the input / output interface I / O3 of the control unit CU of FIG. Similarly, the frequency command signals for pressure control shown in FIGS. 4 and 5 output signals AN0 and CM1 to the inverter terminals 10 to 11 from the input / output interface I / O3. For simplicity, the signals S1, S2, S3, S4, and CM2 may be omitted from the inverter terminals 12 to 16, and the signals AN0 and CM1 may be shared by the inverter terminals 10 to 11. Furthermore, this may be performed by communication. In this way, the inverter is controlled to rise steeply to the assumed frequency, and the pressure can suddenly reach the target pressure. It becomes more prominent if the acceleration time of the inverter is set as short as possible within a range where the inverter does not trip overcurrent.

  FIG. 3 is a circuit diagram of the control panel 9 described in FIG. PW (R, S, T) is a power source, R (or R1), S is a control power source, and MBD, MBV are circuit breakers. INV is an inverter having frequency setting means and an operation display section CONS. The CU is frequency control means (control device) including a CPU, a storage unit M, input / output interfaces I / O 2 and 3 and the like. The CONS is a setting means and is also connected to the control unit CU, and stores in the storage unit M by inputting and setting the target pressure and the assumed frequency of each floor in advance.

  TR is a transformer, I / O1 is an input circuit section for capturing start command signals S2a to S2f (corresponding to floor heights 4F to 2F) from the start switch 22 for each floor, and X is a start command signal S2a to S2f that is captured. This is a relay group that is turned on when it is turned on. 52D and 52V are electromagnetic relays, 49P is a thermal relay, IM is an electric motor, and 43S is a switch for switching a pump or an electric motor to a commercial-stop-inverter operation mode. I / O 2 and 03 are input / output interface units that take in the signal 10 of the pressure detection means and the signals of the relay group X (corresponding to the signals of the start command signals S2a to S2h). As the first mode, the operation signal 52Va is input to the input terminals FW and CM0, the frequency command signals AN0 and CM1 are input to the input terminals 10 to 11, and the inverter assumed frequency command signals (binary) S1, S2, S3, S4, and CM2 are set. It takes in to the input terminals 12-16, respectively. In the control unit CU, the target pressure and the assumed frequency for each floor determined as described above are stored in the storage unit M in advance.

  In FIG. 3, when the circuit breakers 52D and 52V for wiring are turned on and the switch 43S is switched to INV to perform the inverter operation, the electromagnetic relay 52V operates and the inverter can be operated. When water is used in the water supply pipe, the signal S1 (AN2, CM3) of the pressure detection means 10 is input to the input / output interface I / O3 of the control unit CU. When receiving the relay signal group X corresponding to the start command signals S2a to S2h for each floor at the I / O 2, the control unit CU reads the target pressure and the assumed frequency corresponding to the relay signal group X from the storage unit M. Then, the control unit CU outputs an assumed frequency at the time of start-up, and outputs frequency command values AN0 and CM1 so as to perform constant pressure control so that the target pressure and the pressure signal detected by the pressure detecting means are equal. To do.

  In response to the start command signal of each floor, the target pressure and the assumed frequency are read from the storage unit M, and when the engine is started, the assumed frequency is output so as to reach the target pressure sharply. The aforementioned discharge pressure constant control is executed. Then, when the signal of the pressure detection means 10 and the start command signal disappear and the switch 43S is set to stop, the inverter operation command signal and the frequency command signal disappear and stop. In the present embodiment, the operation of the fire hydrant pump unit once operated is stopped only by switching the switch 43S. In this embodiment, the pump is not automatically stopped in this way, and more reliable water supply and fire extinguishing can be performed in the event of a fire.

As described above, in the present embodiment, when an inverter-driven fire hydrant pump system is applied to a building fire hydrant fire extinguishing equipment, etc., a water supply pressure necessary to supply water to the fire hydrant installed on each floor is determined and the discharge pressure is constant by the pump. Take control. Further, in order to specify the floor of the fire hydrant that needs water supply, the start command signal of the fire hydrant start pushbutton switch is used. In the present invention, the target pressure set value and the assumed frequency of the feed water pressure constant value control corresponding to each floor are stored in the storage unit M in advance in association with the pump performance based on the start command signal of each floor, and the assumed frequency is output at the start. Inverter drive that controls the operation so that the pressure signal detected by the pressure detection means installed on the discharge side of the fire hydrant pump (not on the fire hydrant of the water supply pipe terminal) after the pressure rises suddenly To build and provide a fire hydrant pump system.

In order to achieve the above object, in the present embodiment, the water from the water source is supplied to the fire hydrant group of the water supply terminal via the suction pipe, and a fire hydrant pump for supplying water at a desired pressure head and the amount of water is driven. An electric motor, an inverter for driving these, a water supply pipe connected to the discharge side of the fire hydrant pump, and a pressure detection means communicating with this, and a start command signal group of a start switch of a fire hydrant provided on each floor of the water supply pipe And a target pressure set value for feed water pressure constant value control based on the signal of this signal group, and the starting pressure is set and compared with the pressure signal detected by the pressure detection means, this is the target pressure setting Control means for controlling the operation by outputting a frequency command signal to the inverter so as to be equal to the value.

  Further, based on the signal of the start command signal group, the target pressure set value and the assumed frequency of the feed water pressure constant value control stored in the storage unit are read, and the operation is started upon receipt of the start command signal. The inverter has control means for comparing the pressure signal detected by the pressure detection means and outputting a frequency command signal to the inverter so that the pressure signal becomes equal to the target pressure set value.

Further, in the above embodiment, the constant supply water pressure control means is a discharge pressure constant control.
Further, as another aspect of the present embodiment, when a detection signal (pressure) from the pressure detection means cannot be obtained (assuming a pressure sensor abnormality), a signal of a start command signal group from the fire hydrant is transmitted. If so, there is means for fixing the frequency of the inverter to the maximum frequency, or setting the maximum value of the target pressure set value read from the storage unit as the target value. Further, in the above aspect, when a plurality of signals of the start command signal group are transmitted, the frequency of the inverter is fixed to the maximum frequency, or the maximum value of the target pressure set value read from the storage unit is set as the target value Have

  Specifically, it is determined in step 611 in FIG. 6 whether or not a plurality of start command signals are transmitted (meaning that there are a plurality of floor height signals). If a plurality of transmissions are transmitted, the inverter frequency is fixed to the maximum frequency in step 612. Execute the process. Similarly, in step 613, it is determined whether a pressure sensor signal is output or a normal signal is output. If it is determined that the pressure sensor is abnormal, the process proceeds to step 612, and a process for fixing the inverter frequency to the highest frequency as described above is executed. Instead of fixing the inverter frequency to the maximum frequency, the processing in 612 steps may be changed to processing that selects the largest target pressure from the stored target pressures and uses this as the target pressure. If it does in this way, it will set to the safe side at the time of a fire.

  Further, in the above aspect, when the operation is performed by the pressure detection means or the start command signal group signal, there is no start command signal group signal, and even if the stop condition is satisfied, the stop does not stop, and the control panel is an artificial stop means. Is provided. Specifically, it is determined in step 613 in FIG. 6 whether a start command signal has been transmitted from all floors. If not, the operation is stopped by operating the stop switch as shown in step 614. If it does in this way, it will set to the safe side at the time of a fire.

  Further, in FIG. 1, if the start relay board 32 and the control board 9 are equipped with a wired communication means using a carrier wave, the signals (lines) S2a to S2f become a single communication line, and the signal line laying and electrical work can be simplified. Become.

  Furthermore, if a wireless communication means (not shown) is added to the fire hydrants 11a to 11f and the control panel 9 on each floor, laying of signal lines and electrical work become unnecessary, and the start relay panel 32 can be omitted. Specifically, when the start button 22 of the fire hydrant is operated, a wireless communication means (not shown) mounted on the fire hydrant transmits a signal, and the wireless communication means mounted on the control panel 9 Receive a signal. If the wireless communication means mounted on the fire hydrant on each floor and the target pressure information necessary for the height of each floor are associated with each other on a one-to-one basis, the functional performance similar to that described above can be obtained although explanation is omitted.

  DESCRIPTION OF SYMBOLS 1 ... Water source, 2 ... Foot valve, 3 ... Suction pipe, 4 ... Pump, 5 ... Electric motor, 6 ... Check valve, 7 ... Gate valve, 8 ... Water supply pipe, 8a-8f ... Water supply pipe branch pipe, 9 ... Control Panel: 10: Pressure detecting means, 11a to 11f: Fire hydrant, 22: Start switch, 32: Start relay board, CU: Frequency control means, CONS ... Setting means, INV: Inverter, S2a to S2f, S3a to S3f ... Start command signal.

Claims (10)

A fire hydrant pump that feeds water from a water source to a fire hydrant provided on each floor on the demand side through a water pipe;
An inverter for driving the fire hydrant pump;
Pressure detecting means for detecting the pressure on the discharge side of the fire hydrant pump;
A start switch installed on the fire hydrant for transmitting a start command signal based on an operation;
Corresponding to the signal of the signal transmitting means, setting means for setting an assumed frequency corresponding to the target pressure for each floor from the piping resistance curve obtained in advance for each floor;
A frequency control means for controlling a pump frequency by outputting a frequency command signal to the inverter so that the pressure detected by the pressure detection means becomes a target pressure set by the setting means;
The fire hydrant pump system, wherein the frequency control means outputs the assumed frequency to the inverter when the pump is initially started.   2. The fire hydrant pump system according to claim 1, wherein the inverter is controlled to rise to an assumed frequency by the frequency control means at the time of initial start-up, and the discharge pressure is controlled to be constant.   The fire hydrant pump system according to claim 2, wherein the frequency control means controls the inverter to rise to an assumed frequency within a range in which an overcurrent trip does not occur.   In the fire hydrant pump system according to any one of claims 1 to 3, the start switch of the fire hydrant is operated, and a signal indicating that the start pushbutton switch of the fire hydrant of a plurality of floors is operated by the signal transmitting means is transmitted. In this case, the frequency control means outputs a frequency command signal to the inverter to control the pump frequency so that the frequency of the pump becomes a preset maximum frequency.   The fire hydrant pump system according to any one of claims 1 to 3, wherein when the pressure detected by the pressure detection means becomes a predetermined value or less, the frequency control means sets a frequency of the pump in advance. A fire hydrant pump system, wherein a frequency command signal is output to the inverter to control a pump frequency so as to have a maximum frequency.   The fire hydrant pump system according to any one of claims 1 to 5, further comprising a control panel that houses the frequency control means, and the pump is operated by the frequency control means based on an operation of a start switch. The fire hydrant pump system is characterized in that the pump is stopped only by switching a switch provided in the control panel.   The fire hydrant pump system according to any one of claims 1 to 6, further comprising a start relay panel interposed between the fire hydrant and the control panel, and mounting communication means on the start relay panel and the control panel, A fire hydrant pump system, wherein a signal from a signal transmission means of a fire hydrant installed on each floor is transmitted to the control panel via the communication means.   The fire hydrant pump system according to any one of claims 1 to 7, wherein a communication means is mounted on the fire hydrant installed on each floor and the control panel, and the fire hydrant installed on each floor is identified by sending and receiving signals between the two. Fire hydrant pump system characterized by pressure setting.   8. The fire hydrant pump system according to claim 7, wherein a wireless communication means is mounted on the fire hydrant installed on each floor and the control panel, and a fire hydrant installed on each floor is identified and a target pressure required for this is set by exchanging signals between the two. Fire hydrant pump system characterized by A fire hydrant pump that feeds water from the water source to a fire hydrant provided on each floor on the demand side via a water pipe, an inverter that drives the fire hydrant pump, and a pressure detection means that detects the pressure on the discharge side of the fire hydrant pump In the control method of the fire hydrant pump system comprising the frequency control means for controlling the inverter so that the pressure detected by the pressure detection means based on the operation of the start pushbutton switch of the fire hydrant becomes a preset target pressure ,
A start command signal is transmitted based on the operation of the start switch of the fire hydrant;
Based on the start command signal, reading the target pressure and the assumed frequency from the pipe resistance curve obtained in advance for each floor;
A control method for a fire hydrant pump system, wherein the frequency control means controls the inverter to rise to an assumed frequency at the time of initial startup and controls the discharge pressure to be constant.

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