JP5124512B2 - Fire pump system and control method of fire pump unit - Google Patents

Description

The present invention relates to a control method for fire pump systems and fire extinguishing pump unit comprising a pump driven by the variable speed.

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

  In the fire fighting system of Patent Document 1, for example, in paragraph (0025), “Pressurized water supply device 4 includes two pumps driven by a motor. Based on the pressure control signal, the rotation speed of the motor that drives the pump is controlled to set the water supply pressure to a predetermined value, and the pressurized water supply device 4 is based on the water supply amount control signal from the control device 5. Thus, the number of pumps to be started is changed, so that the water supply amount is set to a predetermined value.The present invention does not limit the method of controlling the rotation speed of the motor that drives the pump, but the motor that drives the pump. The number of revolutions is controlled by a VVVF inverter (variable voltage variable frequency inverter) that directly varies the number of revolutions. Which inverter control is desirable ”is disclosed.

In the sprinkler fire extinguishing facility Patent Document 2, for example paragraphs (0016), the "control panel 11, the number of switching operations per unit time in accordance with the fire occurrence floor is called, this inverter - is commanded to motor 13 The pump 2 rotates at a speed proportional to the number of times of switching, and a water pressure corresponding to the rotational speed rises and is sent to the water distribution main pipe 3, and from the branch pipe 63 to the sprinkler head 8 on the floor via the automatic alarm valve 72. The water pressure corresponding to the rotational speed is supplied as a water pressure obtained by subtracting the head pressure from the pump 2 to the sprinkler head 8, that is, an appropriate water pressure within a predetermined range suitable for the fire extinguishing operation. The water pressure effectively extinguishes fire and prevents damage caused by excessive water pressure when the fire is extinguished. Since the pressure of the water height in the distribution main pipe 3 remains, in the case where the influence of this pressure is large, by providing a check valve at every predetermined height, the excessive water pressure due to the pressure is almost reduced. It can be prevented. "

JP 2005-253532 A JP 5-84322

However, according to the fire fighting system described in Patent Document 1, a discharge device that discharges a fire extinguisher is specified based on a discharge signal, and a water supply pressure control signal and a water supply amount control signal are supplied to the pressurization device based on this. Although it is supposed to be transmitted, there is no disclosure about the point of improving the reliability of surely raising the pressure to the required level, that is, reliably supplying water. On the other hand, if the water is supplied unnecessarily, the piping may burst, and it is necessary to supply the water at an appropriate pressure. Japanese Patent Application Laid-Open No. H10-228561 does not disclose any appropriate pressure control to improve reliability.
A first object of the present invention is to provide a stable extinguishing pump unit reliable water supply can be performed with at the time of a fire.

As the sprinkler fire extinguishing facility according to Patent Document 2 is described in paragraph (0014), and the rotational speed of the pump controlled by the inverter, and the number of switching operations per unit time at this time is in the fire detecting means It is preset for each operation floor of the running water detection device. Also, this Patent Document 2 does not disclose the improvement of reliability, which is superior. Furthermore, there is no disclosure about efficient water supply while maintaining this reliability.
A second object of the present invention is to provide a fire extinguishing pump unit which can perform efficiently the water supply.

In order to achieve the above object, one embodiment of the present invention is a fire pump that feeds water from a water source to sprinklers provided on each floor on the demand side via a water pipe, and an electric motor that drives the fire pump. An inverter for driving the electric motor, a pressure detecting means for detecting the pressure on the discharge side of the fire pump, a discharge signal transmitting means for transmitting a signal indicating that the sprinkler is provided in the water pipe, and the discharge signal transmitting means And a target pressure setting means for setting a target pressure from a pipe resistance curve obtained in advance for each floor, and a pressure detected by the pressure detection means becomes a target pressure set by the target pressure setting means. And a frequency control means for controlling the pump frequency by outputting a frequency command signal to the inverter.

In the above aspect, more preferred embodiments are as follows.
(1) The discharge pressure constant control or the terminal pressure constant control is performed by the frequency control means.
(2) When a signal indicating that the multi-level sprinkler has been activated is transmitted by the discharge signal transmission means, the frequency control means sends a frequency command signal to the inverter so that the pump frequency becomes the preset maximum frequency. Output and control the pump frequency.
(3) When the pressure detected by the pressure detecting means falls below a predetermined value, the frequency control means outputs a frequency command signal to the inverter so that the pump frequency becomes a preset maximum frequency. Control the frequency.
(4) When the frequency of the pump is controlled by the frequency control means based on the signal from the discharge signal transmission means, the pump is stopped only by switching the switch provided on the control panel.

Another embodiment of the present invention for achieving the above object is to provide a fire extinguishing pump that feeds water from a water source to sprinklers provided on each floor on the demand side through a water pipe, and drives the fire extinguishing pump. Motor, an inverter for driving the motor, a pressure detection means for detecting the pressure on the discharge side of the fire pump, and the pump frequency is maximum when the pressure detected by the pressure detection means falls below a predetermined value. A fire-extinguishing pump system provided with a frequency control means for controlling a pump frequency by outputting a frequency command signal to an inverter so as to have a frequency.

Furthermore, the control method of another embodiment of the water from the water source, fire extinguishing pump unit having a pump for water supply to the sprinkler provided on each floor of the demand side through a water pipe of the present invention for achieving the above object The step of transmitting a signal indicating that the sprinkler has been activated, the step of setting a target pressure from a pipe resistance curve determined in advance for each rank based on the signal, and the pressure on the discharge side of the pump is the target pressure. And a step of outputting a frequency command signal to an inverter that drives the pump at a variable speed.

According to an embodiment of the present invention, it is possible to provide a stable extinguishing pump unit reliable water supply can be performed with at the time of a fire. According to another embodiment of the present invention, it is possible to provide while maintaining the reliability, the fire extinguishing pump unit for efficient water supply.

The system system | strain diagram of the inverter drive fire pump system of a present Example. The pump performance curve figure at the time of performing discharge pressure constant control (example of feed water pressure constant value control) of a present Example. The circuit diagram of the control panel of a present Example. The pump performance curve figure for demonstrating the discharge pressure constant control at the time of sprinkler discharge | release. The flowchart which shows the algorithm of discharge pressure constant control. The figure for demonstrating the control flow of a present Example.

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 pump system of this embodiment. 1 is a water source, for example, a fire extinguishing water tank. Reference numeral 4 denotes a pump that attaches a foot valve 2 to the tip, provides a suction pipe 3 on the suction side, and supplies water to the water supply pipe 8. Although not shown in the figure, a check valve 13 and a gate valve 14 are attached to the discharge side. An electric motor 5 drives the pump, and a pressure tank 6 communicates with the water supply pipe 8 and has air inside to pressurize the water supply piping system. Similarly, 7 is a pressure detection means attached to the pressure tank or the vicinity thereof, and transmits an electric signal S13 corresponding to the pressure. Further, the water supply pipe is provided with a sprinkler SP for each floor, and is provided with discharge signal transmitting means 10a to 10e for detecting a state in which the sprinkler SP is opened. This signal is position information indicating which floor it is, and this floor is specified thereby, and a necessary water supply pressure head (target pressure) is determined for each floor.

  Further, the pump 4 described above is selected in advance so as to have the required performance based on the water supply pressure head determined in this way and the design water supply required for each floor. Although 9 will be described later, a control panel incorporating an inverter, a control device and the like, 12 is a signal taken from the emission signal transmitting means 10a to 10e described above by the cable group S11 via the relay boxes 11a to 11e, and the emission signal. It is a fire receiver for transmitting to the control panel as group S12. In the figure, illustrations are omitted from the third floor above the ground, but the explanation example is from the fourth basement to the fourth floor above the ground.

  FIG. 2 is a pump performance curve when the fire pump is subjected to constant discharge pressure control by an inverter (an example of feed water pressure constant value control) in the system shown in FIG. Head). H04F is a water supply pressure (head) necessary for supplying a predetermined amount of water Q0 when the fourth-floor sprinkler SP is opened, and is a target value. Similarly, H0B3F and H0B4F are water supply pressures (heads) required to supply a predetermined amount of water Q0 when the sprinklers SP on the third basement floor and the fourth basement floor are opened 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, the necessary water supply amount and water supply pressure are set in advance for each floor. By controlling the frequency of the inverter and driving the pump so as to achieve this target pressure, it is possible to perform reliable water supply 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. The frequency f0B4F is a frequency necessary for producing the target pressure H0B4F when the predetermined water amount Q0 needs to be supplied when the sprinkler SP on the fourth basement floor is opened.

  Curve A is the pump Q-H performance when the pump is operated at the inverter frequency f04F. Similarly, this frequency f04F is necessary for supplying the predetermined amount of water Q0 when the sprinkler SP on the fourth floor is opened. This is the frequency necessary to generate the target pressure H04F. Similarly, curves B to H are pump Q-H performances when the pump is operated with the inverter frequency changed from f03F to f0B4F (f03F >> f0B4F). F03F to f0B4F are respectively from the third floor to the fourth basement. This is the frequency required when the sprinkler is activated.

  As will be described in detail 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 the sprinkler on the third floor above the ground is operated, the target pressure required to feed the predetermined water quantity Q0 is obtained as H03F from the pipe resistance curve R03F. Therefore, the frequency of the pump is set to f03F in advance so as to be H03F. Assumes. Thus, by setting an appropriate target pressure, it is possible to perform reliable water supply.

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. However, according to this embodiment, it is possible to supply the water was as suitable pressure as described above, it is possible to provide a preventing reliable extinguishing pump unit rupture. 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. Although the pressure once increased by this pressure reducing valve is used to supply water, this water supply method has 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, a pipe resistance curve is assumed, a predetermined water amount Q0 is secured, and a water supply pressure head (target pressure) for each floor can be set and appropriate pressure constant control can be performed. and then to allow the provision of an anti-fire pump unit economically and with merit.

  Curve A represents the pump QH performance when the pump is operated at an inverter frequency f100% (100% frequency). In the present embodiment, f04F below 100% frequency is used as the pump frequency when the fourth-floor sprinkler is operated. 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.

The correspondence between pump performance, discharge signal and resistance curve when the discharge pressure constant control is performed is as follows.
Release signal Target pressure Inverter frequency Pump performance Resistance curve
10h (4F) H04F f04F A R04F
10 g (3F) H03F f03F B R03F
10f (2F) H02F f02F C R02F
10e (1F) H01F f01F D R01F
10d (B1F) H0B1F f0B1F E R0B1F
10c (B2F) H0B2F f0B2F F R0B2F
10b (B3F) H0B3F f0B3F G R0B3F
10a (B4F) H0B4F f0B4F H R0B4F
For example, when the sprinkler is opened on the fourth basement floor (B4F), a discharge signal 10a is transmitted, and thereby the target pressure H0B4F is selected, 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 discharge pressure constant control when the target pressure at the time of releasing the sprinkler on the fourth floor is H0B4F.
FIG. 5 is a flowchart showing an algorithm for constant discharge pressure control. In FIG. 5, when a release signal from each floor is input, a target pressure is set in 500 steps. Taking the fourth basement floor (B4F) as an example, the target pressure is H0 = H0B4F. Next, in step 501, pressure data H of the feed water pressure is detected by the pressure sensor 7. In step 502, the target pressure H0 (H0B4F) is compared with the detected pressure data. If H0> H, the inverter acceleration control process is executed in step 503, and then the process returns to step 502. If H0 = H at this time, the process proceeds to the next process although omitted in FIG.

  If H0 <H, the process proceeds to step 504, and after the inverter deceleration control process is executed, the process returns to step 502. By repeating this, the feed water pressure becomes the target pressure H0 (= H0B4F). As a result of this control, the inverter frequency swings up and down in FIG. 4, and the inverter frequency approaches the design value 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 below is R0B4F. In this embodiment, the water supply amount when the sprinkler is operated is Q0. Note that the sprinklers of all floors may start to operate at this water supply amount Q0, or 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.

  FIG. 3 is a circuit diagram of the control panel. R, S and T are power sources, R and S are control power sources, MBD and MBV are circuit breakers, INV is an operation display unit M having frequency setting means, and CU is a control device. As a first mode, the operation signal 52Va is input to the input terminals FW and CM0, and the frequency command signal AN0 is input to the input terminals 10 to 14.

  The target pressure corresponding to the discharge signals 10a to h is determined as described above and stored in the memory unit of the control unit CU. The constant pressure control is performed based on the target pressure and the pressure signal detected by the pressure detecting means. As a result, the frequency command value AN0 is output from the control device. 52D and 52V are electromagnetic relays, 49P is a thermal relay, IM is an electric motor, 43S is a switch for switching a pump or electric motor to a commercial-stop-inverter operation mode, CU is a control device, and TR is a transformer. Further, I / O is an input unit which takes in the signal 7 of the pressure detecting means and the signals of the discharge signal transmitting means 10a to 10h. B4FX to PSX are relays corresponding to these signals. This relay signal is input to the input terminals 10 to 18 of the control unit CU. The specific operation of the constant discharge pressure control is as described above.

FIG. 6 is a control flow of the aforementioned control device.
In FIG. 3, when the inverter circuit is operated by turning on the circuit breakers 52D and 52V and switching the switch 43S, the electromagnetic relay 52V is operated and the inverter can be operated. When water is used in the water supply pipe, a signal from the pressure detection means 7 is transmitted, and a signal S13 (see FIG. 1) from the control unit CU is input. Although not shown in FIG. 5, initially, the motor and pump are driven at a frequency of f100% on the safe side.

The target pressure is determined corresponding to the release signal for each floor, and the above-described discharge pressure constant control is executed. When the signal of the pressure detecting means 7 and the release 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 extinguishing pump unit only by switching the switch 43S is intended to stop. Without be stopped in this manner automatically pump in this embodiment, it is to possible to make a more reliable water supply and firefighting.

  As described above, in the present embodiment, when an inverter-driven fire pump system is applied to a building sprinkler fire extinguishing facility or the like, the water supply pressure required to supply water to the sprinkler (emission discharge device) installed on each floor is set. Determine and perform constant discharge pressure control with the pump. In addition, the emission signal is used to identify how many sprinklers are open. The present invention generates and stores a target pressure setting value for feed water pressure constant value control in association with the pump performance based on the release signal, and pressure detection means (sprinklers for the water supply piping terminal) installed on the discharge side of the fire pump. Inverter-driven fire extinguishing pump system is constructed and provided to control operation so that the detected pressure signals coincide with each other.

  In order to achieve the above object, in the present embodiment, a water pressure from a water source is supplied to a sprinkler head group of a water supply terminal via a suction pipe, and a fire extinguishing pump that supplies water at a desired pressure head and water amount, and A discharge signal transmitting means group provided on each floor of the water supply pipe, including an electric motor to be driven, a water supply pipe connected to the discharge side of the fire pump, a pressure detection means and a pressure tank connected to the fire pump discharge side Based on the signal from the discharge signal transmitting means group, the target pressure set value for the feed water pressure constant value control is generated, the starting pressure is set, and this is compared with the pressure signal detected by the pressure detecting means. Control means for controlling the operation by outputting a frequency command signal to the inverter so as to be equal to the target pressure set value.

  Further, based on the signal of the discharge signal transmission means group, a target pressure set value for the feed water pressure constant value control is generated, and the starting pressure is set and compared with the pressure signal detected by the pressure detection means. The inverter has a control means for outputting a frequency command signal to the inverter so as to be equal to the target pressure set value and controlling the operation.

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 the pressure detection means detects a feed water pressure equal to or lower than the starting pressure, the generated target pressure setting value is generated even if the signal of the discharge signal transmission means group is not transmitted. Has a means for setting a maximum value as a target value. Further, when the signal of the discharge signal transmitting means group is transmitted even if the pressure detection means does not detect the feed water pressure below the starting pressure, the maximum value of the generated target pressure set value is the target value. And has means for driving. Further, in the above aspect, there is provided means for setting a maximum value of the target pressure set value as a target value when a plurality of signals of the discharge signal transmitting means group are transmitted.

  Further, in the above aspect, when the operation is performed by the signal of the pressure detecting means or the discharge signal transmitting means group according to the target pressure set value determined below the starting pressure or based on the signal of the discharge signal transmitting means group, the release signal There is no signal from the transmission means group, and even if the stop condition is satisfied, the control panel does not stop and an artificial stop means is provided on the control panel.

  DESCRIPTION OF SYMBOLS 1 ... Water source, 2 ... Foot valve, 3 ... Suction pipe, 4 ... Pump, 5 ... Electric motor, 6 ... Pressure tank, 7 ... Pressure detection means, 8 ... Water supply pipe, 13 ... Check valve, 14 ... Gate valve, SP …sprinkler.

Claims (7)

A fire pump that feeds water from a water source to sprinklers provided on each floor on the demand side through a water pipe;
An electric motor that drives the fire pump;
An inverter for driving the electric motor;
Pressure detecting means for detecting the pressure on the discharge side of the fire pump,
A signal indicating that the sprinkler provided in the water pipe is activated, and a discharge signal transmitting means for transmitting a predetermined discharge signal for each floor ,
Storage means for storing the target pressure for each floor in association with the release signal for each floor;
Target pressure setting means for setting a target pressure having a rank corresponding to the discharge signal from a plurality of target pressures stored in the storage means based on a signal from the discharge signal transmitting means;
Frequency control means for outputting a frequency command signal to the inverter to control the frequency of the pump so that the pressure detected by the pressure detection means becomes the target pressure set by the target pressure setting means. Features a fire pump system.   2. The fire pump system according to claim 1, wherein constant discharge pressure control or constant terminal pressure control is performed by the frequency control means.   In Claim 1, when the signal which shows that the sprinkler of multiple floors act | operated was transmitted by the said discharge | release signal transmission means, the said frequency control means is the said frequency so that the frequency of the said pump may become the preset maximum frequency. A fire-extinguishing pump system that controls a pump frequency by outputting a frequency command signal to an inverter.   3. The frequency control unit according to claim 1, wherein when the pressure detected by the pressure detection unit becomes a predetermined value or less, the frequency control unit sets a frequency to the inverter so that a frequency of the pump becomes a preset maximum frequency. A fire extinguishing pump system characterized by outputting a command signal to control the pump frequency.   The pump according to any one of claims 1 to 4, wherein when the frequency of the pump is controlled by the frequency controller based on the signal of the discharge signal transmitter, the pump is switched only by switching a switch provided in a control panel. Is a fire extinguishing pump system characterized by being shut down. A fire pump that feeds water from a water source to sprinklers provided on each floor on the demand side through a water pipe;
An electric motor that drives the fire pump;
An inverter for driving the electric motor;
Pressure detecting means for detecting the pressure on the discharge side of the fire pump,
Frequency control means for controlling the pump frequency by outputting a frequency command signal to the inverter so that the frequency of the pump becomes the maximum frequency when the pressure detected by the pressure detection means becomes a predetermined value or less. A fire pump system characterized by comprising. Water from the water source, a control method for extinguishing fire pump unit having a pump for water supply to the sprinkler provided on each floor of the demand side through a water pipe,
Transmitting a predetermined release signal for each floor indicating that the sprinkler has been activated;
In association with the emission signal of each floor, the target pressure of each floor is stored, on the basis of the emission signal, from a plurality of stored target pressure, sets a target pressure of the rank corresponding to the emission signal step When,
And a step of outputting a frequency command signal to an inverter that drives the pump at a variable speed so that the pressure on the discharge side of the pump becomes the target pressure.

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