JP5080308B2 - Inverter-driven fire pump system - Google Patents

Description

  The present invention relates to an inverter-driven fire pump system.

  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. Therefore, a highly reliable system is required for water supply, and an inverter-driven fire pump system has been rarely used in the past. In other fields of water supply systems, inverter-driven water pump systems are actively employed for the purpose of stabilizing the water pressure and saving energy.

  In recent years, with the widespread use of inverters, there has been a trend of adopting inverters in fire fighting pump systems. As these known examples, there are JP-A-2005-253532 (Patent Document 1) and JP-A-2005-304242 (Patent Document 2).

JP 2005-253532 A JP-A-2005-304242

  Patent Document 1 specifies a discharge device such as a sprinkler that discharges a fire extinguisher based on a discharge signal (a necessary amount of water and a head are determined), and a pressurization device (fire extinguishing pump system, pump rotation speed is an inverter) A fire fighting system including a control device that transmits a water supply pressure control signal and a water supply amount control signal is disclosed. Patent Document 2 discloses that in an apparatus for driving an electric motor with an inverter, the inverter is stopped at the time of a power failure and is started with a reduced voltage start.

  However, when the fire extinguishing pump is driven by an inverter, how to determine the inverter frequency based on the water supply pressure control signal and the water supply amount control signal, how to determine the pump performance, and how to relate it, etc. There is no description, and trial and error are required for realization. Neither patent document gives consideration to prompt response to deterioration in pump performance due to secular change, increase in piping resistance, and performance change during pump replacement.

  According to the present invention, the inverter operating frequency is determined by associating the water supply amount and the water supply pressure required by the discharge device specified based on the discharge signal with the pump performance to be used, and supplying the appropriate water supply to the specified discharge device. It provides a system that can do this.

  In order to achieve such an object, the present invention controls a fire extinguishing pump that feeds water from a water source to a discharge device provided on each floor through a water pipe, an electric motor that drives the fire extinguishing pump, and the electric motor. A pressure tank provided with an inverter, a pressure detection means communicating with the water supply pipe on the discharge side of the fire pump, and a discharge signal transmitting means group for transmitting a discharge signal provided on each floor of the water supply pipe and specifying a discharge device discharged And an inverter-driven fire pump system comprising a control device for controlling the inverter based on the emission signal and a control panel incorporating these control devices, the inverter has a frequency setting means and a storage means in advance. An operating frequency corresponding to the release signal of the release signal transmitting means group is set and stored, and the control unit performs the operation based on the operation signal of the pressure detection means. Outputs a driving signal to the converter, said on the basis of the release signal and outputs a speed command signal for selecting the operating frequency stored in said inverter, characterized in that it is configured to perform operation control.

  Also, a fire extinguishing pump that feeds water from a water source to a discharge device provided on each floor via a water pipe, an electric motor that drives the fire extinguishing pump, an inverter that controls the electric motor, and a water supply pipe on the discharge side of the fire pump A pressure tank having pressure detection means communicating with the discharge tank, a discharge signal transmission means group for transmitting a discharge signal provided on each floor of the water supply pipe for specifying a discharge apparatus, and controlling the inverter based on the discharge signal In the inverter-driven fire pump system comprising a control device and a control panel incorporating these control devices, the inverter has storage means for setting and storing a frequency by an external signal, and the control unit detects the pressure The operation signal is output to the inverter based on the operation signal of the means, and the operation frequency command signal is output to the inverter based on the release signal. And force, characterized in that it is configured to perform operation control.

  Further, the inverter stores the frequency at which the water supply amount and the water supply pressure necessary for each discharge device specified by the discharge signal of the discharge signal transmission means group in the performance of the pump used are obtained for each discharge signal. The frequency is selected according to the signal of the pressure detecting means or the discharge signal transmitting means group.

  Further, the inverter corresponds to each discharge device with a frequency for obtaining a water supply amount and a water supply pressure necessary for each discharge device specified by the discharge signal in the pump performance determined by the operation frequency of the pump used in the storage means. The frequency is selected by the signal of the pressure detection means or the release signal transmission means group, and when only the operation signal of the pressure detection means is transmitted, the operation control is performed by selecting the operation frequency of 100%. To do.

  Further, the inverter corresponds to each discharge device with a frequency for obtaining a water supply amount and a water supply pressure necessary for each discharge device specified by the discharge signal in the pump performance determined by the operation frequency of the pump used in the storage means. When a frequency is selected by a signal from the pressure detection means or the discharge signal transmission means group, a signal from the pressure detection means is transmitted, and a plurality of discharge signals from the discharge signal transmission means group are transmitted. Operation control is performed by selecting an operation frequency of 100%.

  Further, the inverter corresponds to each discharge device with a frequency for obtaining a water supply amount and a water supply pressure necessary for each discharge device specified by the discharge signal in the pump performance determined by the operation frequency of the pump used in the storage means. After the operation at the frequency selected by the signal of the pressure detecting means or the discharge signal transmitting means group, the operation is continued regardless of the presence or absence of the signal of the pressure detecting means or the discharge signal transmitting means group, and the control is performed. Operation is stopped when the panel switch is turned off.

  According to the present invention, a plurality of inverter operating frequencies determined in association with the performance of the pump to be used are stored in correspondence with the pressure detection means and each discharge device, and the inverter is received from the control device that has received the pressure detection signal and the discharge signal. Since this is instructed, it is easy to implement. In addition, when the equipment changes over time, changes, or is updated, it can be realized simply by changing the setting of the inverter operating frequency.

  Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a system diagram of an inverter-driven fire pump system. Reference numeral 1 denotes a water source such as a fire extinguishing water tank. A pump 4 is provided with a suction pipe 3 having a foot valve 2 attached to the tip thereof on the suction side, a check valve 13 and a gate valve 14 on the discharge side, and supplies water to the water supply pipe 8. 5 is an induction motor for driving the pump, and 6 is a pressure tank provided with pressure detecting means 7 communicating with the water supply pipe 8. The pressure tank has air inside and pressurizes the water supply piping system.

  The water supply pipe 8 is provided with a sprinkler SP as a discharge device for each floor, and is provided with discharge signal transmission means 10a to 10f for generating a discharge signal when the sprinkler SP is in an open state. This discharge signal includes fire extinguishing operation information indicating that the sprinkler SP has been opened and extinguishing water has been released, and position information indicating “fire extinguishing operation floor”. Since the number of installed sprinklers SP is known in advance, the required water supply pressure and the amount of water supply can be made to correspond.

  When the sprinkler head SP of the water pipe terminal is opened, the pressure detection means 7 transmits an ON signal at a predetermined pressure or less, and returns to an OFF signal when it is closed. Similarly, the discharge signal transmitting means group provided on each floor of the water pipe transmits an ON signal when the corresponding sprinkler head is opened, and returns and transmits an OFF signal when the sprinkler head is closed.

  Reference numeral 9 denotes a control panel incorporating an inverter INV and a control unit CU, which will be described later. Reference numeral 12 denotes a discharge signal group S12 that takes in the discharge signals from the discharge signal transmission means 10a to 10f via the relay boxes 11b to 11f. Fire receiver for transmission to the control panel. In FIG. 1, the illustration is omitted from the third floor above the ground, but in the following explanation examples, the fourth floor below is the fourth floor above ground.

  FIG. 2 is a pump performance curve when the fire extinguishing pump to be used is inverter-operated in the system shown in FIG. 1, and the horizontal axis indicates the amount of water supply and the vertical axis indicates the water supply pressure (head). Curve A is the pump QH performance when the pump is operated at the inverter frequency f0. Similarly, curves B to H are the pump QH performance when the pump is operated with the inverter frequency changed from f1 to f7. Curve I is the pump QH performance when the pump is operated at an inverter frequency f100% (100% frequency higher than f7). A curve R0 is a pipe resistance curve when water is supplied to the floor B4F (4th floor underground), and similarly, curves R1 to R7 are pipe resistance curves when water is supplied to the floors B3F to 4F.

  Now, when the pump used by changing the inverter frequency in FIG. 2 is operated so that the water supply amount Q0 and the water supply pressure necessary for the sprinkler SP on the (specified) floor corresponding to each discharge signal can be obtained. FIG. 5 shows a relationship diagram in which each discharge signal is associated with a frequency, a pump performance curve, and a resistance curve.

  In FIG. 5, for example, when the sprinkler is opened on the fourth basement floor (B4F), a discharge signal 10a is transmitted, the corresponding inverter frequency f0 is selected, and the pump is operated at the frequency f0 by the inverter. The pump performance curve at this time is A, and the pipe resistance curve when water flows from the pump 4 to the fourth floor underground is R0. The operating point of the pump is determined at the intersection O0 between the pump performance curve A and the resistance curve R0. The water supply pressure is obtained by reading the intersection point O0 with the water supply pressure on the vertical axis, and the water supply amount Q0 is obtained by reading the intersection point O0 with the water supply amount on the horizontal axis.

  Thus, in order to obtain the water supply amount Q0 and the water supply pressure necessary for the sprinkler SP of the floor corresponding to each discharge signal, it is understood that the relationship shown in FIG. 5 is created and the frequency is associated with each discharge signal. .

  FIG. 3 is a circuit diagram of the control panel. R, S, and T are power sources, R and S are control power sources, and MBD and MBV are circuit breakers. INV is an inverter including an operation display unit C having a frequency setting unit and a storage unit M for storing the operation frequency set by the operation display unit C. The storage means M may store the operation frequency command value directly from an external control unit CU (described later). The INV further includes input terminals FW and CM0 for an operation signal 52Va, frequency command signals (speed command signals) S0 to S3, CM1 input terminals 10 to 14, and an input terminal 15 for a frequency command value signal AN0. .

  52D and 52V are electromagnetic relays, 49P is a thermal relay, IM is an electric motor (induction motor 4 in FIG. 1), 43S is a pump, a switch for switching the electric motor IM to commercial-stop-inverter operation mode, CU is a control device, and TR is A transformer and I / O are input units, and take in signals from the pressure detection means 7 and the discharge signal transmission means 10a to 10h. B4FX to PSX are relays corresponding to these signals, and simultaneously indicate relay contacts. The control unit CU includes control means for determining an inverter frequency in response to signals from the relay contacts B4FX to PSX, input terminals 10 to 18 to which the relay contacts are connected, and the determined inverter Output terminals 1 to 5 for outputting digital speed command signals S0 to S3 and CM1 corresponding to the frequency, and an output terminal 6 for outputting an analog frequency command value AN0 of the determined inverter frequency.

  In the first embodiment, the inverter frequency is set and stored in advance in the storage means M from f0 to f7 shown in FIG. The frequency set in the storage means M is selected by command signals S0 to CM1 from the control unit CU. The relationship between the speed command signal and the frequency is shown in FIG. In the second embodiment, a frequency command value (for example, f0 to f100%) is directly input from the terminal 6 of the control unit CU to the inverter input terminal 15 as the signal AN0, and temporarily stored in the storage means M at the frequency. The inverter is controlled.

  In the above configuration, when any one of the pressure detection means 7 and the release signal transmission means 10a to 10h transmits a signal, the corresponding relay (B4FX to PSX) operates to close the contact. In the first embodiment, the control unit CU outputs the speed command signals S0 to CM1 as output frequency terminals 1 to 5 as inverter frequency command signals corresponding to the pump performance based on signals input to any of the input terminals 10 to 18. To the inverter input terminals 10-14. In the second embodiment, AN0 is directly output from the output terminal 6 to the inverter input terminal 15 as a frequency command value (for example, f0 to f100%).

  Next, the control flow of the control unit CU will be described with reference to FIG. In FIG. 3, when the circuit breakers 52D and 52V for wiring are turned on and the switch 43S is operated to the inverter operation side, the electromagnetic relay 52V operates and the inverter can be operated. When water is used in the water supply pipe and the pressure decreases, a signal from the pressure detection means 7 is transmitted, and the relay contact PSX by this signal is input to the control unit CU. In step 5 (S5) of FIG. 4, this process (YES) is executed, and an f100% signal (speed command signal or frequency command value) is input to the inverter. In S9, the inverter operates the motor and pump at a frequency of f100%. To do.

  Next, for example, when a discharge signal is transmitted from the 4F discharge signal transmitting means 10h, the process (YES) is executed in S12 via S11, and the signal of f7 is transmitted to the inverter INV in S16 and the motor is driven at the frequency of f7. IM and the pump 4 are operated. Thereafter, similarly, the release signals of the respective floors are respectively transmitted, the processes of S13 to S19 are executed, and the speed command signal or the operation frequency command value is transmitted to the inverter by the control unit CU in accordance with the above-mentioned correspondence relationship, and the operation is continued.

  When only the operation signal of the pressure detecting means 7 is transmitted, the operation is controlled by selecting the operation frequency of 100%. That is, in FIG. 4, after NO processing in S10, NO processing is performed in S23 and the process returns to S9, so that the operation is continued at a frequency of f100%. This corresponds to the possibility that the sprinkler may be open because the operation signal of the pressure detecting means 7 is output and the piping pressure is lowered, and that the discharge signal transmitting means fails and the discharge signal is not output. Thus, it is particularly effective in securing a sufficient piping pressure for fire extinguishing.

  Further, when a signal from the pressure detecting means 7 is transmitted and a plurality of discharge signals from the discharge signal transmitting means group are transmitted, the operation is controlled by selecting a 100% operation frequency. Although this is not shown in the control flow of FIG. 4, since the piping pressure is reduced and a plurality of discharge signals are transmitted, it corresponds to the possibility of a fire spreading, and for fire extinguishing. This is to obtain a sufficient water supply amount and water supply pressure.

  Further, after the operation at the frequency selected by the signal of the pressure detection means or the discharge signal transmission means, the operation is continued regardless of the presence or absence of the signal of the pressure detection means or the discharge signal transmission means group, and the control panel switch 43S (artificial Operation is stopped when the operation is stopped. In FIG. 4, the pump stops only when YES processing is performed in S22, YES processing in S23, or YES processing in S24. This is a response to the possibility that a failure may occur in the pressure detection means or release signal transmission means group due to a fire, and once the pump has been activated due to the occurrence of a fire, it is automatically performed by a control system such as a control device. It will not stop, and it will not stop unless the control panel switch is turned off artificially. This is to ensure a sufficient amount of water supply and water supply pressure for fire fighting.

It is a system distribution diagram of an inverter drive fire pump system. It is a pump performance curve figure at the time of inverter operation. It is a circuit diagram of a control board. It is a control flowchart of a control apparatus. (1/2) It is a control flowchart of a control apparatus. (2/2) FIG. 6 is a relationship diagram in which each emission signal is associated with a frequency, a pump performance curve, and a resistance curve when the pump is operated. It is a related figure of a frequency and a speed command signal.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Water source, 4 ... Pump, 5 ... Electric motor, 6 ... Pressure tank, 7 ... Pressure detection means, 8 ... Water supply pipe, 9 ... Control panel, 10a-10h ... Release signal generation means, C ... Frequency setting means, M ... Storage means, CU ... control device, INV ... inverter, S0-S3 ... speed command signal, AN0 ... operating frequency command value.

Claims (5)

A fire pump that feeds water from a water source to a discharge device provided on each floor via a water pipe, an electric motor that drives the fire pump, an inverter that controls the electric motor, a water pipe on the discharge side of the fire pump, A pressure tank provided with pressure detection means for transmitting an ON signal below a predetermined pressure when the discharge device provided in the water pipe is opened, and a discharge device provided on each floor of the water pipe and discharged In an inverter-driven fire pump system composed of a discharge signal transmitting means group for transmitting a discharge signal that specifies the discharge signal and a control device that controls the inverter based on the discharge signal,
The inverter has frequency setting means and storage means, and is determined in advance in association with pump performance so as to obtain a water supply amount and a water supply pressure necessary for the discharge device corresponding to the discharge signal of the discharge signal transmitting means group. The control device outputs the operation signal to the inverter based on the operation signal of the pressure detecting means, and selects the operation frequency stored in the inverter based on the release signal. An inverter-driven fire pump system that outputs a speed command signal to be operated and operates only at a selected operating frequency. A fire pump that feeds water from a water source to a discharge device provided on each floor via a water pipe, an electric motor that drives the fire pump, an inverter that controls the electric motor, a water pipe on the discharge side of the fire pump, A pressure tank provided with pressure detection means for transmitting an ON signal below a predetermined pressure when the discharge device provided in the water pipe is opened, and a discharge device provided on each floor of the water pipe and discharged In an inverter-driven fire pump system composed of a discharge signal transmitting means group for transmitting a discharge signal that specifies the discharge signal and a control device that controls the inverter based on the discharge signal,
The inverter has storage means for setting and storing a frequency by an external signal, and the control device outputs an operation signal to the inverter based on an operation signal of the pressure detection means, and a discharge device corresponding to the discharge signal The operation frequency command value of one of a plurality of operation frequencies determined in association with the pump performance is output to the inverter so that the necessary water supply amount and supply water pressure can be obtained, and the operation is performed only with the output operation frequency. An inverter driven fire extinguishing pump system characterized by being configured as described above. In the inverter, the pumping performance determined by the operating frequency of the pump to be used is made to correspond to each discharging device with the frequency at which the water supply amount and the water supply pressure necessary for each discharging device specified by the discharging signal are obtained. When a frequency is selected according to a signal of the pressure detection means or the discharge signal transmission means group and only an operation signal of the pressure detection means is transmitted, 100% operation frequency is selected to control the operation. The inverter drive fire-extinguishing pump system according to claim 1 or 2. In the inverter, the pumping performance determined by the operating frequency of the pump to be used is made to correspond to each discharging device with the frequency at which the water supply amount and the water supply pressure necessary for each discharging device specified by the discharging signal are obtained. 100% when a plurality of discharge signals of the discharge signal transmitting means group are transmitted , and a frequency is selected by a signal of the pressure detection means or the discharge signal transmission means group, a signal of the pressure detection means is transmitted, The inverter-driven fire-extinguishing pump system according to claim 1 or 2, wherein the operation frequency is selected and operation control is performed . In the inverter, the pumping performance determined by the operating frequency of the pump to be used is made to correspond to each discharging device with the frequency at which the water supply amount and the water supply pressure necessary for each discharging device specified by the discharging signal are obtained. After a plurality of stored and operated at the frequency selected by the signal of the pressure detecting means or the discharge signal transmitting means group, the operation is continued regardless of the presence or absence of the signal of the pressure detecting means or the discharge signal transmitting means group, and the control panel switch The inverter-driven fire pump system according to claim 1 or 2, wherein the operation is stopped when the operation is stopped .

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