JP2014121371A - Inverter drive fire pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire pump system that meets a standard by controlling an inexpensive general-purse fire pump by inverter drive.SOLUTION: An inverter drive fire pump system includes a fire pump for supplying water from a suction side to spray means of a fire hydrant or a sprinkler installed on each floor on a demand side through a water pipe, an electric motor for driving the fire pump, and an inverter for driving the electric motor. When a first specified point of pump performance is defined as an amount of water Q being 100%, a net pump head H being 100%, and shaft power S being 100% under an inverter frequency f0, the fire pump, the electric motor, and the inverter are selected and combined so as to satisfy a second specified point of a discharge amount Q being 150%, a net pump head H being 65% or more, and shaft power S being 110% or less under an inverter frequency f1.

Description

  The present invention relates to an inverter-driven fire pump system including a pump driven at a variable speed and applied to fire water. The fire pump system here refers to a system including a fire hydrant pump system and a sprinkler pump system.

  The fire pump system must be quickly operated and watered by a fire detector, discharge device or man-made operation in case of fire. For this reason, a highly reliable pump and system are required for water supply. Conventionally, there are few examples of using an inverter-driven fire hydrant pump system. 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 addition, a fire pump used in a fire pump system needs to maintain a certain level or more in order to be used as water for fire fighting, and the pump performance (including motor performance) is the standard of the pressurized water supply system ( Fire Service Agency Notification No. 8 (hereinafter abbreviated as “Standard”). This will be described with reference to FIG.

  In FIG. 12, the horizontal axis represents the discharge amount (m3 / min), the vertical axis represents the total lift (m), and the shaft power (kW, equivalent to motor output). A0 is a pump QH performance curve when the pump is operated with commercial power f50, 60 (indicates that the commercial power is 50 Hz or 60 Hz), and S0 is a shaft power (equivalent to motor output) curve at this time. Is shown. And as shown in the figure, the fire extinguishing pump must select a pump having a performance that satisfies the first specification point O1, the second specification point O2, and the third specification point O3 at the same time (based on the standard).

  The first specification point O1 is that the pump discharge amount is Q100%, the total head is H100%, and the shaft power is S100%. The second specification point O2 indicates that the pump discharge amount is Q150%, the total lift is H65% or more, and the shaft power is S110% or less. That is, when the discharge amount is increased from Q100% to Q150%, it means that the total lift is secured to H65% or more and the shaft power is suppressed to S110% or less.

  The third specification point is that the total deadline of the deadline (when the pump discharge amount is 0) is H140% or less. This is because the pump may be shut off during a trial run, and if this value is too high, there is a risk of damaging the water supply pipes or the equipment such as fire hydrants and sprinklers installed at the terminals. Here, 65%, 110%, 140%, and 150% indicate percentages. Since the regulation for performance is severe, it is necessary to develop and employ a dedicated pump for the fire fighting pump, or to modify and adopt the performance so as to satisfy the above three specification points. It became a pump, and it was difficult to adopt an inexpensive general-purpose pump.

  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.This invention does not limit the method of controlling the number of rotations of the motor that drives the pump, It is desirable to control the rotational speed of the motor to be driven by inverter control such as a VVVF inverter (Variable Voltage Variable Frequency Inverter) that directly varies the rotational speed. . "To be 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. There is a disclosure that a pressure control operation is performed by selecting a required target pressure set value based on the signal of, and a plurality of values (target pressures PA, PB) are stored, but the floor number and the target pressure are in one-to-one correspondence. Let me not remember. 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

  As described above, Patent Document 1 and Patent Document 2 do not describe how the pump performance is adapted to the standard when the fire pump is driven by an inverter. That is, there is no disclosure of how to define motor performance and inverter performance, how to combine these performances, and how to control inverter frequency and pressure control.

  In view of the above-mentioned conventional problems, an object of the present invention is to provide an inverter-driven fire-extinguishing pump system adapted to the above-mentioned standard by driving an inexpensive general-purpose fire-extinguishing pump with an inverter.

In order to solve the above problems, the present invention provides a fire extinguishing pump that feeds water from the suction side to a water discharge means of a fire hydrant or sprinkler provided on each floor of 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 target pressure setting means for determining and setting a target pressure necessary to feed water to the water discharge means at the highest position and the farthest in advance from a required end pressure and a pipe resistance curve;
A control device for controlling the pump frequency by outputting a frequency command signal to the inverter so that the pressure detected by the pressure detection means becomes the target pressure set by the target pressure setting means,
When the first specification point of the pump performance is the water amount Q100% under the inverter frequency f0, the total lift H100%, and the shaft power S100%, the discharge amount Q150% under the inverter frequency f1 and the total lift H65%. As described above, the fire pump, the electric motor, and the inverter are selected and combined so as to satisfy the second specification point where the shaft power is S110% or less.

In addition, in order to solve the above-mentioned problems, the present invention provides a fire pump for supplying water from the suction side to a water discharge means of a fire hydrant or sprinkler 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,
An operation signal transmitting means for transmitting an operation signal when the water discharge means is operated;
A target pressure setting means for setting a target pressure for each floor from a pipe resistance curve obtained in advance for each floor based on the operation signal of the operation signal transmitting means;
A control device for controlling the pump frequency by outputting a frequency command signal to the inverter so that the pressure detected by the pressure detection means becomes the target pressure set by the target pressure setting means,
When the first specification point of the pump performance is the water amount Q100% under the inverter frequency f0, the total lift H100%, and the shaft power S100%, the discharge amount Q150% under the inverter frequency f1 and the total lift H65%. As described above, the fire pump, the electric motor, and the inverter are selected and combined so as to satisfy the second specification point where the shaft power is S110% or less.

  Further, in the inverter-driven fire pump system described above, the fire pump is selected so as to satisfy a first specification point, the motor is selected so as to satisfy a second specification point, and the inverter is configured to satisfy both specifications. It was selected to satisfy the point.

  Moreover, in the inverter drive fire-extinguishing pump system described above, a general-purpose pump that satisfies the rating of water volume Q100% and total head H100% under the inverter frequency f0 of the first specification point is selected as the fire-extinguishing pump, As the electric motor, an electric motor is selected whose shaft power is 110% or less of the rated output when operating at a discharge amount Q150% and a total lift H65% or more under the inverter frequency f1 of the second specification point, As the inverter, an inverter capable of increasing the speed up to the frequency f1 is selected.

  In the inverter-driven fire pump system described above, an inverter is used in which the inverter current is less than the rated current when operating at an inverter frequency f1 with a discharge amount of Q150% and a total lift of H65% or more. It is characterized by that.

  Moreover, in the inverter drive fire-extinguishing pump system described above, the inverter frequency is limited so that the inverter current becomes equal to or lower than the rated current at the time of speed increase by inverter frequency control.

  In the inverter-driven fire pump system described above, the frequency is controlled to be equal to or lower than the corresponding frequency (f1) of the discharge amount Q150% at the time of speed increase by inverter frequency control.

  In the inverter-driven fire pump system described in the above contract, the maximum target pressure set value is limited to be set to 140% or less of H of the fire pump, and water is supplied during the shut-off operation (when the discharge amount is 0). The pressure is controlled so as to be H140% or less.

  Further, in the inverter-driven fire pump system described above, when the inverter frequency f0 is close to the commercial frequency, the inverter frequency f1 is set to a frequency higher than the commercial frequency.

  Further, in the inverter-driven fire pump system described above, when the inverter frequency exceeds the frequency (f0) corresponding to the first specification point at the time of speed increase by the inverter frequency control, the target pressure is switched to H65% to control the pressure. It is characterized by that.

  According to the present invention, the performance can be adapted to the above-mentioned standard with a general-purpose fire pump by frequency control and pressure control by inverter drive, so that special development and modification are unnecessary, and the cost of the fire pump system can be reduced. . In addition, the pressure control by inverter frequency control determines the pump performance, motor performance, and inverter performance to satisfy the overall function, so the reliability of the fire pump system can be improved.

1 is a system diagram of a fire pump system using a sprinkler according to an embodiment of the present invention. 1 is a system diagram of a fire pump system using a fire hydrant according to an embodiment of the present invention. The pump performance curve figure which matched the standard by the inverter drive of this invention Example. The pump performance curve figure which applied the discharge pressure constant control for every floor of this invention Example. The pump performance curve figure which applied the terminal pressure constant control of an Example of this invention. The circuit block diagram of the control board of this invention Example. The pump performance curve figure for demonstrating discharge pressure fixed control. The flowchart which shows the algorithm of discharge pressure fixed control. The flowchart which shows the algorithm of terminal pressure constant control. The flowchart for demonstrating the control action of this invention Example. The detailed block diagram of a fire hydrant. Explanatory drawing which shows a fire pump performance standard.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a system diagram in which the inverter-driven fire pump system of the embodiment is applied to a building sprinkler fire extinguishing equipment, and an example is 10 stories.

  1 is a water source, for example, a fire extinguishing water tank. Reference numeral 4 denotes a suction pipe 3 having a foot valve 2 attached to the tip thereof on the suction side, and a sprinkler fire pump (hereinafter referred to as a fire pump) that feeds water to the water pipe 10, and 5 denotes an electric motor (motor) that drives the fire pump 4. The fire extinguishing pump 4 is provided with a pressure tank 14, a check valve 6, and a gate valve 7 having an air reservoir inside on the discharge side. 9 is a pressure detection means (pressure sensor) which is located in the vicinity of the pump and is attached to the water supply pipe 10, and transmits an electric signal S11 corresponding to the detected pressure. The transmitted electrical signal S11 is received by the control panel 8 described later.

  Further, the water supply pipe 10 includes sprinklers (water discharge means) 10-1a to 10-3a to e in the water supply pipe branch pipes 10-1 to 10-3 for each floor, respectively, and a sprinkler group (water discharge means group). ). 10-1 s to 10-3 s are each a water discharge device (operation signal transmission means) that emits a signal (operation signal) that is discharged when the sprinkler is opened, and has a one-to-one correspondence with the sprinkler for each floor. It is attached to the part that can be identified. For convenience, 10-1 s to 10-3 s is also used as the emission signal (operation signal) of the emission device. These signal groups are transmitted to the control panel 8 as S13.

  As will be described in detail later, the control panel 8 incorporates an inverter, a control device, and the like, and supplies power (variable frequency, variable voltage) to the electric motor 5 through the power cable S10. These signals (operation signals) 10-1 s to 10-3 s transmitted from the discharge devices on each floor are positional information indicating which floor, the floor is specified by this, and the water supply pressure required for each floor (Target pressure), or the initial inverter frequency corresponding to this, or the initial inverter frequency corresponding to this is determined together with the feed water pressure (target pressure) required for each floor.

  FIG. 2 shows a system diagram in which the inverter-driven fire pump system of the present embodiment is applied to a fire hydrant fire extinguisher in a building, and an example is 10 stories. The pressure tank 14 shown in FIG. 1 is omitted, and instead of sprinklers, discharge devices, and discharge signals, fire hydrants (water discharge means) 10-1a to 10-3a and start command signals (operation signals) thereof are used. . The fire hydrant is pulled in by branch pipes 10-1 to 10-3 of the water pipe 10, as shown in FIG. 11, and a start pushbutton switch (operation signal transmitting means) 22, a bell 23, a start display lamp 24, a hose 25, A nozzle 26 is provided. Then, when the start pushbutton switch 22 of the fire hydrant is operated, a start command signal 10-1s to 10-3s indicating that the start command is transmitted is transmitted.

  In FIGS. 1 and 2, the floor height is specified by a start command signal transmitted from a fire hydrant on each floor or a signal (operation signal) transmitted from a sprinkler (release device), and a necessary water supply pressure for each floor. (Target pressure), or an initial inverter frequency corresponding to the target pressure, or an example of determining a feed water pressure (target pressure) required for each floor and an initial inverter frequency corresponding thereto. Also, instead of using a specific signal for these floor heights, the worst and most extreme fire extinguisher or sprinkler (water discharge means) in advance, taking into account the actual head, required end pressure, and pipe resistance loss. The total head (the same as the target pressure) and the inverter initial frequency corresponding thereto may be determined and set. The worst condition means that if the water is fed using the total head and the inverter initial frequency, the water can be fed wherever it is used.

  FIG. 3 shows a pump performance curve showing the relationship among the fire-extinguishing pump performance, motor performance, and inverter performance of the inverter-driven fire-extinguishing pump system. The horizontal axis represents the discharge amount (m3 / min), and the vertical axis represents the total lift. (M) shows shaft power (kW, equivalent to motor output). A curve A0 is a pump QH performance curve when operated at an inverter frequency f0, and a curve S0 is a pump shaft power curve (equivalent to a motor output) at this time. At the first specification point O1, the discharge amount Q100%, the total lift H100%, and the shaft power S100% are satisfied.

  Next, consider the second specification point O2. That is, the discharge amount Q150% (the point where the discharge amount Q100% of the first specification point O1 is increased to 150%) and the total lift H65% (the total lift H100% of the first specification point O1 is 65%) The point of 2) is the second specification point O2. The inverter frequency f1 (frequency higher than f0) is determined so as to intersect with the second specification point O2, and the pump QH performance when operating at the inverter frequency f1 is a curve A1. Naturally, it is obvious that the performance of the pump QH intersects the curve A1 and the second specification point O2.

  A curve S1 is a pump shaft power curve (equivalent to a motor output) when operated at the inverter frequency f1. An intersection point O4 between the curve S1 and a straight line obtained by extending the point of the discharge amount Q150% upward is a point where the pump shaft power S110% is obtained.

  Based on FIG. 3 demonstrated above, selection of a fire extinguishing pump, an inverter, and an electric motor is demonstrated. First, for the fire pump 4, a general-purpose pump that satisfies the rating of the first specification point O1 discharge amount Q100% and the total lift H100% is selected, and the second specification point O2 is supported by increasing the speed to the inverter frequency f1. To do. As the inverter INV, an inverter that can increase the speed up to the frequency f1 is selected. The pump that satisfies the first specification point O1 can satisfy the second specification point O2 as a pump capacity.

  As will be described later, the third specification point O3 limits the set value so that the maximum target pressure set value is set to be equal to or less than the third specification point (H140%). ) Supply water pressure by pressure control.

  Then, the electric motor 5 is driven at the second specification point O2 (shown at the point O4), that is, the shaft power when operating with the discharge amount Q150% and the total lift H65% or more under the inverter frequency f1 ( The output is selected so that its output) is 110% or less of the rated output, and further, at this point O4, the inverter INV is selected so that its current is not more than a constant current. The trip of the inverter INV can be prevented, and priority can be given to continued operation.

  In this way, the fire-extinguishing pump includes an inexpensive general-purpose pump with an appropriate capacity that satisfies the first specification point O1, an inexpensive electric motor with an appropriate capacity that satisfies the second specification point, and an inverter with an appropriate capacity. It can be used, the system can be made small and inexpensive, and the problems described in the prior art can be solved.

  FIG. 4 is a pump performance curve diagram of the system when constant discharge pressure control for each floor by an inverter is applied to the systems shown in FIGS. 1 and 2, with the horizontal axis representing the water supply amount and the vertical axis representing the water supply pressure (head). , Shows shaft power (equivalent to motor output).

  H010F is a water supply pressure (head) necessary to feed a predetermined amount of water Q0 (consent with 100% of Q in FIG. 3) to a fire hydrant or sprinkler water discharge device on the 10th floor, and a target pressure (consent with H100% of FIG. 3). It is. Similarly, R10 is a pipe resistance curve showing the pipe resistance generated when a predetermined amount of water Q0 (same as H100% in FIG. 3) is supplied to the 10th floor fire hydrant or sprinkler water discharge device. The pipe resistance Hf, the actual lifting height Ha, and the terminal pressure Hp are included under the predetermined water quantity Q0.

  The predetermined water amount Q0 and the target pressure H010F are the first specification point O1, and the pump QH performance curve A is obtained under the inverter frequency f10, which satisfies this specification point. That is, the inverter frequency f10 is determined so as to satisfy the first specification point O1. When these various quantities Hf, Ha, Hp, and HT (the total head is the same as the target pressure H010F when the 10th floor is taken as an example), they are as shown at the left end of FIG.

Here, taking the 10th floor as an example, the method for obtaining the total head HT is shown as the following equation (1).
HT = Ha + Hf + Hp (1)
Here, Ha is the actual head height m (the actual height from the water surface of the water source to the 10th floor fire hydrant or sprinkler water discharge device), and Hf is the pipe resistance loss (m) (the predetermined water volume Q0 from the water surface of the water source to the 10th floor fire hydrant or Pipe resistance loss when water is supplied to the sprinkler water discharge device), Hp is a required end pressure (m) (pressure head required for a fire hydrant or sprinkler water discharge device).

  Next, a second specification point O2 with a discharge amount Q150% and a total lift H65% is considered. This specification point O2 is such that the intersection of the discharge amount Q150% and the total lift H65% becomes the intersection with the pump QH performance A11 obtained when operating at an inverter frequency f11 higher than f10. This means that the inverter frequency f11 is determined so that the pump performance A11 intersects the first specification point O2. S1 is a shaft power curve when the inverter is operated at the inverter frequency f11. The intersection O4 between this curve and a straight line obtained by extending the point of the discharge amount Q150% upward is the point of the shaft power S110%.

  Similarly, H09F and H08F are water supply pressures (heads) required to feed a predetermined amount of water Q0 (same as Q100% in FIG. 3) to the 9th and 8th floor fire hydrants or sprinkler water discharge devices, respectively. is there. Similarly, R9 and R8 are piping resistances generated when water is supplied to the 9th and 8th floor fire hydrants or sprinkler water discharge devices, respectively. Curves B and C are fire fighting pump QH performance curves for satisfying the target pressures H09F and H08F necessary for supplying water to the 9th and 8th floor fire hydrants or sprinkler water discharge devices, respectively, at inverter frequencies f9 and f8. This is the performance obtained when driving. The method for obtaining these target pressures (total head) and the display thereof are the same as described above, and therefore the description thereof is omitted. Further, the necessary water supply pressure (head) for each floor below the seventh floor or the inverter frequency corresponding to this is not shown because it is clear from the above description.

  The target pressure for each floor obtained as described above is temporarily stored at the time of processing of the arithmetic processing unit CPU of the control unit CU, which will be described later, or stored in the storage unit M and used. That is, these target pressures are determined based on the start command signal for each floor, and the pump is driven by controlling the frequency of the inverter so that the water supply pressure detected by the pressure detecting means 9 becomes this target pressure. When this happens, it is possible to provide reliable and accurate water supply for each floor. Further, as described above, since the pressure control is performed so that the maximum value of the target pressure is not set higher than the pressure head of the third specification point of the pump, the third specification point may be satisfied. it can.

The correspondence between pump performance, each floor start command signal, and resistance curve when the discharge pressure constant control for each floor is performed is as follows. That is, when the start command signal is generated on the 9th floor, the target pressure is H09F, the inverter initial frequency is f9, and the target pressure is set from the pipe resistance curve R9 obtained in advance for the 9th floor. When the start command signal is generated on the 8th floor, the target pressure is H08F, the inverter initial frequency is f8, and the target pressure is set from the pipe resistance curve R8 obtained in advance for the 8th floor. Although the description for the 7th floor and below is omitted, the target pressure and inverter initial frequency are set for each floor, and based on this, starting at the initial frequency, discharge is controlled by the target pressure set for each floor, and the pressure is constant. Execute.
Start command signal Target pressure Inverter frequency Pump performance Resistance curve 10-3S (10F) H010F f10 A R10
10-2S (9F) H09F f9 B R9
10-1S (8F) H08F f8 C R8
Thus, based on the operation signal of the signal transmission means, the target pressure for each floor is set by the target pressure setting means from the pipe resistance curve obtained in advance for each floor. The target pressure setting means includes an arithmetic processing unit CPU and a storage unit M of a control unit CU described later.

  FIG. 5 is a pump performance curve diagram of the system when the terminal pressure constant control by the inverter is applied to the systems shown in FIGS. 1 and 2. The horizontal axis represents the water supply amount, the vertical axis represents the water supply pressure (head), and the shaft power. (Equivalent to motor output). Here, the constant end pressure control means that the total head in the worst condition (target) is added to the fire extinguisher or sprinkler (discharge device) at the farthest and farthest point, taking into account the actual head, required end pressure, and pipe resistance loss. And the inverter initial frequency (see FIG. 5) are determined and set, and the inverter frequency is controlled so that the water supply pressure detected by the pressure detecting means becomes the set target pressure.

  In FIG. 5, the same symbols as those in FIG. 4 are the same, and the method of determining the first and second specification points of the pump, the method of determining the motor output and the inverter rated current, and the method of selecting these are the same. The explanation is omitted. R11 is a piping resistance curve when water is supplied to the above-mentioned highest and farthest, that is, a fire hydrant or sprinkler (discharge device) on the 10th floor. The method for determining the target pressure (total head) necessary for supplying water here is H010F, which is the same as described above, and the lower limit target pressure is H010FL. The lower limit side target pressure is f12 (see FIG. 5) and the inverter initial frequency corresponding to H010FL.

  Specifically, in response to a start command from the fire hydrant or sprinkler (discharge device) of the water supply piping terminal, the initial inverter frequency f12 is output and the operation is started, and the speed gradually increases toward the water supply amount Q0 (consent with Q100%). Then, the water supply pressure moves on the resistance curve R11 from H010FL to reach the upper limit target pressure H010F, and the operation is performed in this state. This does not change regardless of where the start command signal is generated.

  Furthermore, in FIG. 3, FIG. 4, FIG. 5, when the inverter frequencies f0 and f10 are about 50 Hz or 60 Hz of the commercial frequency, the inverter frequencies f1 and f11 are set to frequencies higher than the commercial frequency of 50 Hz or 60 Hz. You can also. If it does in this way, the fire pump performance at the time of inverter drive can be easily adapted to a standard, and it becomes easy to use a general-purpose pump for a fire pump.

  FIG. 10 is a flowchart showing main processing and pressure control processing (processing algorithm) performed by the control unit CU described later. Although not shown, the target pressure for constant discharge pressure control and the inverter initial frequency or the target pressure for constant terminal pressure control and the inverter initial frequency are determined and set by initial processing and interrupt processing. In addition, if the control unit CU described later includes a storage unit M, the target pressure and inverter initial frequency for each floor, the target pressure for constant terminal pressure control and the inverter initial frequency are stored in the storage unit in advance. In addition, when the start command signal from the fire hydrant or the discharge signal of the discharge device is generated in the manner described above, it may be selected and read from the storage unit based on this. At this time, the storage unit M of the control unit CU serves as a target pressure setting unit.

  First, discharge control for each floor will be described. In FIG. 10, the middle part irrelevant to the intention of the invention is omitted, but for the sake of convenience of explanation, it is assumed that the start command is generated on the 10th floor. Since it is stopped at the beginning, the processing proceeds to 600 steps by processing 611 and 613A. Steps 600 to 607 determine and set the target pressure and inverter initial frequency for each floor. Or you may perform the process which reads an inverter initial frequency from the said memory | storage part M as mentioned above. Check whether there is a start command in order from the top floor to the bottom floor, and determine and set the target pressure for the floor with the start command. Alternatively, the target pressure may be read from the storage unit.

  For example, in step 600, it is determined whether the start pushbutton switch of the fire hydrant on the top floor, in the embodiment, the 10th floor is operated and a start command signal (operation signal) or a sprinkler discharge signal (operation signal) is not transmitted. If it is transmitted, the process proceeds to step 601 to determine and set the target pressure as H010F. Alternatively, H010F is selected from the storage unit M and read. If not transmitted, the process proceeds to the processing steps of the next floor and the target pressure setting or reading processing of the lowest floor is sequentially executed. Since the setting or reading process of the target pressure on the other floor is obvious as described above, the description thereof will be omitted. When the target pressure is set, the process proceeds to 608 steps.

  If it is determined in step 600 to 607 that there is no start command signal from the fire hydrant or discharge device on each floor, the process returns to step 611 to continue execution. 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. In step 610, the pressure control process shown in FIG. 8 or FIG. 9 is executed. First, the process of constant discharge pressure control will be described.

  For convenience of explanation, it is assumed that the target pressure H0 = H010F (10th floor target pressure) is set or read in the above-described 600 to 607 steps. The set or read target pressure is temporarily stored, for example, in a register of the arithmetic processing unit CPU described later. Here, the arithmetic processing unit CPU serves as target pressure setting means.

  In FIG. 8, the pressure data H of the feed water pressure is detected by the pressure detection means 9 in 500 steps. In step 501, the target pressure H0 (H010F) is compared with the detected pressure data H. If H0−α> H as a result of the comparison, it is determined in step 502 whether or not the inverter frequency is equal to or lower than the frequency of f0 + Δf (in consideration of the fact that the frequency shown in FIG. 7 fluctuates up and down). If it is determined, the process proceeds to step 503, and if it is determined YES, the process proceeds to step 505. In step 505, the inverter speed increasing control process is executed, and then the process returns to step 500.

  In step 503, it is determined whether the frequency is equal to or higher than f1. If the frequency is less than the f1 frequency, the process proceeds to step 504, and if it is equal to or higher than the f1 frequency, the process proceeds to step 614. In step 504, the target pressure is set to 65%, and the process proceeds to step 505 of the speed increasing process. Note that, as shown in FIG. 7, Δf is a frequency that takes into account fluctuations up (f10 ″) and down (f10 ′) around f10, for example, within several Hz.

  If the determination at step 501 is H0−α <= H <= H0 + α, the detailed processing is omitted in FIG. 8, but the processing proceeds to the next step 614.

  In this way, in FIG. 4, the range in which the inverter frequency is lower than f0 is the discharge pressure constant control by the target pressure for each floor, and the target pressure for each floor is set to H65% in the range where the inverter frequency exceeds f0 + Δf. The discharge pressure constant control by this value can be executed, and the motor output and the inverter current can be lowered as compared with the case where the entire region is operated at the target pressure for each floor. This causes a case where the capacity of the motor and the inverter can be reduced.

  In the above process, the speed increasing process is performed in step 505, and then the process returns to step 500. If the inverter frequency exceeds f0 + Δf in step 502, the target pressure is switched to H65% and the growth process is performed again in step 505. Is going. The inverter frequency exceeds f0 + Δf when it exceeds the frequency (f0) corresponding to the first specification point. Therefore, when the speed is increased during the inverter frequency control, the inverter frequency becomes the frequency (f0) corresponding to the first specification point. When it exceeds, the target pressure is switched to H65% to control the pressure. Therefore, control within the range of the first specification point and the second specification point is easily and reliably performed.

  If the determination in step 501 is H0 + α <H, the process proceeds to step 506, 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 (= H010F). Α represents the dead time of the target pressure and is approximately 1 to 2 m, and aHz in 505 and 506 steps represents the shift control width of the inverter and is appropriately set to 0.1 to 1 Hz. As a result of this control, the inverter frequency fluctuates up and down in FIG. 7 (f10 ′ to f10 ″) and approaches the design value f10. Actually, the pipe resistance is different from the design value, and the predetermined quantity such as the frequency f10 and the flow rate Q0 does not match the design value. However, priority is given to controlling the discharge pressure to the target value. A practical level can be achieved.

  Next, the terminal pressure constant control will be described. In step 610 of FIG. 10, the terminal pressure constant control process shown in FIG. 9 is executed. In FIG. 9, the processing indicated by the same step symbols as in FIG. The 800 and 801 step processes are processes for updating the target pressure after the target pressures match in 501 steps. The update of the target pressure is executed when the inverter frequency is equal to or lower than f0 + Δf in the determination of 800 steps. The target value is a piping resistance curve R11 shown in FIG. 5, which is displayed as a function or a table, and is obtained based on the current inverter frequency. That is, when the process of FIG. 9 is executed, the terminal pressure constant control is obtained. If the inverter frequency exceeds f0 + Δf in the determination of 800 steps, the target pressure is lowered to H65% and the discharge is controlled to be constant pressure.

  Now, a case where the water supply amount Q0 (consent with the discharge amount Q100%) increases to Q150% will be described by taking constant discharge pressure control (FIG. 8) for each floor as an example. In FIG. 1 and FIG. 2, there is one place where the sprinkler and the fire hydrant are operated and the water supply amount is shown as Q0. However, if there are several places, the water supply amount is increased to Q150%. Good. When the amount of water supply increases from Q0, the water supply pressure falls below the target pressure H010F (10th floor target pressure). Then, the processes of 500, 501, 502, 503, 504, and 505 shown in FIG. 8 are repeatedly executed so that the water supply pressure detected by the pressure detecting unit 9 becomes the target pressure H010F.

  As a result, even if the amount of water supply increases to Q150%, the inverter frequency is limited to less than f1, and the water supply pressure is maintained at 65% or more of the target pressure H010F. Further, instead of limiting the inverter frequency to less than f1, a method of limiting the inverter current to less than the rated current may be used. Specifically, the processing in step 503 is changed to processing in which the inverter current is detected and compared with the rated current. If the inverter current is less than the rated current, the speed increasing processing is performed. It is sufficient to process so as to return to step S2. This is the same for the terminal pressure constant control (FIG. 9), although the explanation is omitted.

  Furthermore, in steps 600 to 607 in FIG. 10, when setting the target pressure for each floor, the set value does not exceed the maximum value H010F (the set value on the top floor, which is the maximum value in this embodiment). If the check process is executed and the discharge pressure constant control described above is executed, the third specification point (H140%) defined by the pump performance is not exceeded.

  Considering water supply to a fire hydrant or water discharge device, it is desirable that the water supply pressure reaches the target pressure steeply. In this case, when setting or reading the target pressure in steps 601, 603, and 605 of FIG. 10, the inverter initial frequency is also set or read, and the inverter initial frequency is output by setting or reading during the pump initial operation processing in step 609. To do. Specifically, signals AN0 and CM1 are output to the inverter terminals 10 and 11 from the input / output interface I / O3 of the control unit CU described later. In this way, the target pressure can be rapidly reached by accelerating the inverter with the inverter initial frequency set or read. 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. 6 is a circuit diagram of the control panel 8 described with reference to FIGS. In the figure, PW (R, S, T) is a power source, R (or R1), S is a control power source, MBD, MBV are circuit breakers, INV is an inverter having a frequency setting means and an operation display section CONS, CU Is a control device including an arithmetic processing unit CPU, a storage unit M, input / output interfaces I / O2, 3 and the like. The arithmetic processing unit CPU and the storage unit M function as target pressure setting means.

  TR is a transformer, I / O1 is a start switch of a fire hydrant for each floor, or a start command signal 10-1S to 10-3S (floor height ... 8F ~ from a water discharge device (10-1S to 10-3S)) X is a relay group (... 8FX to 10FX) that is turned on when the taken start command signals 10-1S to 10-3S are turned on.

  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 an operation mode of commercial operation and inverter operation, BS1 is a start pushbutton switch, BS2 is a stop pushbutton switch, I / O2 , 3 is an input / output interface section, from which the pressure detection means signal 10 and the relay group X signal (relays corresponding to the start command signals 10-1S to 10-3S... 8FX to 10FX are input) take in.

  In FIG. 6, for the sake of convenience, it is assumed that the circuit breakers MBD and MBV for each layer zone are turned on and the switch 43S selects INV. Assume that a fire has occurred on the 10th floor, and consider a case where a start command signal 10-3S from the fire hydrant start switch or the discharge device is generated.

  This start command signal is taken into the input circuit unit I / O1 of the control panel 8, and the corresponding relay 10FX is turned ON. The control unit CU takes in the signal (contact point) of the relay 10FX from the input / output interface I / O2, and based on this signal, the arithmetic processing unit CPU sets the target pressure to H010F and determines and sets the inverter initial frequency to f10. . Alternatively, H010F and f10 are selected and read from the target pressure and inverter frequency stored in advance from the storage unit M. These are stored in a register of the arithmetic processing unit CPU.

  Subsequently, the arithmetic processing unit CPU outputs a signal for turning on the relay X and frequency command signals AN0 and CM1 from the input / output interface I / O3 in response to taking in the signal (contact) of the relay 10FX. The contact of the relay X is connected to the input side of the electromagnetic relay 52V. When the contact X is turned on, the electromagnetic relay 52V is turned on, and the contact 52Va turns on the inverter terminals FW and CM0. The frequency command signals AN0 and CM1 are input to the inverter terminals 10 and 11 to start operation.

  The water supply pressure detected by the pressure detection means 9 is taken in from the input / output interface I / O3 as a signal S1 (AN2, CM3) and stored in the storage unit M.

  In the control panel 8 having the above-described configuration, the control unit CU executes pressure control of the fire pump system by inverter frequency control according to the flowcharts illustrating the control operations of FIGS. 8 to 10 described above.

In summary, the fire pump 4 for feeding water from the suction side to the water discharge means 10-1a to 10-3e of the fire hydrant or sprinkler provided on each floor on the demand side through the water pipe 10; An electric motor 5 that drives the fire pump, an inverter INV that drives the electric motor,
The pressure detection means 9 for detecting the pressure on the discharge side of the fire extinguishing pump and the target pressure determined in advance from the required end pressure and the piping resistance curve to set the target pressure required to feed the water discharge means at the highest position and farthest in advance A frequency command signal is output to the inverter INV so that the pressure detected by the pressure setting means CPU, M and the pressure detection means 9 becomes the target pressure set by the target pressure setting means CPU, M, and the pump And a control unit CU for controlling the frequency, and when the first specification point O1 of the pump performance is the water amount Q100%, the total head H100%, the shaft power S100% under the inverter frequency f0, the inverter frequency f1 In order to satisfy the second specification point O2 in which the discharge amount Q is 150%, the total lift H is 65% or more, and the shaft power S is 110% or less, And wherein the combination by selecting an inverter INV.

  The target pressure setting means sets a target pressure for each floor from a piping resistance curve obtained in advance for each floor, based on operation signals 10-1s to 10-3s transmitted when the water discharge means operates. Target pressure setting means may be used.

  The fire pump 4 is selected so as to satisfy the first specification point O1, the motor 5 is selected so as to satisfy the second specification point O2, and the inverter is selected so as to satisfy both the specification points. It is characterized by that.

  Further, a general-purpose pump that satisfies the rating of the water volume Q100% and the total head H100% under the inverter frequency f0 of the first specification point O1 is selected as the fire-extinguishing pump 4, and the electric motor 5 has a second specification point O2 An electric motor with shaft power of 110% or less of the rated output when operating at an inverter frequency f1 with a discharge amount of Q150% and a total lift of H65% or more is selected, and the inverter INV up to the frequency f1 An inverter that can increase the speed is selected.

  In addition, an inverter is used in which the inverter current is equal to or lower than the rated current when operating at a discharge amount of Q150% and a total lift of H65% or more under the inverter frequency f1.

  In addition, the inverter frequency is limited so that the inverter current becomes equal to or lower than the rated current at the time of speed increase by inverter frequency control.

  Further, the control is performed so that the frequency becomes equal to or less than the corresponding frequency (f1) of the discharge amount Q150% at the time of speed increase by inverter frequency control.

  In addition, the maximum target pressure set value is limited to be set to 140% or less of the fire pump, and control is performed so that the feed water pressure is 140% or less during the shutoff operation (when the discharge amount is 0). It is characterized by.

  Further, when the inverter frequency f0 is set near the commercial frequency (50 Hz, 60 Hz), the inverter frequency f1 is set higher than the commercial frequency.

  Further, when the speed is increased by the inverter frequency control, when the inverter frequency exceeds the frequency (f0) corresponding to the first specification point, the target pressure is switched to H65% and the pressure control is performed.

  DESCRIPTION OF SYMBOLS 1 ... Water source, 2 ... Foot valve, 3 ... Suction pipe, 4 ... Fire extinguishing pump, 5 ... Electric motor, 6 ... Check valve, 7 ... Partition valve, 10 ... Water supply pipe, 10-1 to 10-3 ... Water supply pipe branch Pipe, 8 ... Control panel, 9 ... Pressure detection means, 10-1a to e to 10-3a to e ... Water discharge means (fire hydrant, sprinkler), 10-1S to 10-3S ... Operation signal, start command signal, operation signal Transmission means, S10, S11, S13 ... control panel exchange signal, CU ... control device, CPU, M ... target pressure setting means, INV ... inverter, O1 ... first specification point, O2 ... second specification point.

Claims (10)

A fire pump that feeds water from the suction side to a water discharge means of a fire hydrant or sprinkler provided on each floor of 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 target pressure setting means for determining and setting a target pressure necessary to feed water to the water discharge means at the highest position and the farthest in advance from a required end pressure and a pipe resistance curve;
A control device for controlling the pump frequency by outputting a frequency command signal to the inverter so that the pressure detected by the pressure detection means becomes the target pressure set by the target pressure setting means,
When the first specification point of the pump performance is the water amount Q100% under the inverter frequency f0, the total lift H100%, and the shaft power S100%, the discharge amount Q150% under the inverter frequency f1 and the total lift H65%. As described above, an inverter-driven fire pump system characterized by selecting and combining the fire pump, the electric motor, and the inverter so as to satisfy the second specification point of shaft power S110% or less. A fire pump that feeds water from the suction side to a water discharge means of a fire hydrant or sprinkler provided on each floor of 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,
An operation signal transmitting means for transmitting an operation signal when the water discharge means is operated;
A target pressure setting means for setting a target pressure for each floor from a pipe resistance curve obtained in advance for each floor based on the operation signal of the operation signal transmitting means;
A control device for controlling the pump frequency by outputting a frequency command signal to the inverter so that the pressure detected by the pressure detection means becomes the target pressure set by the target pressure setting means,
When the first specification point of the pump performance is the water amount Q100% under the inverter frequency f0, the total lift H100%, and the shaft power S100%, the discharge amount Q150% under the inverter frequency f1 and the total lift H65%. As described above, an inverter-driven fire pump system characterized by selecting and combining the fire pump, the electric motor, and the inverter so as to satisfy the second specification point of shaft power S110% or less. In the inverter-driven fire pump system according to claim 1 or 2,
The fire pump is selected to satisfy a first specification point, the motor is selected to satisfy a second specification point, and the inverter is selected to satisfy both the specification points. Inverter-driven fire pump system. In the inverter-driven fire pump system according to claim 3,
As the fire extinguishing pump, a general-purpose pump that satisfies the rating of water volume Q100% and total head H100% under the inverter frequency f0 of the first specification point is selected.
As the electric motor, an electric motor is selected whose shaft power is 110% or less of the rated output when operating at a discharge amount Q150% and a total lift H65% or more under the inverter frequency f1 of the second specification point,
An inverter-driven fire pump system characterized in that an inverter capable of speeding up to a frequency f1 is selected as the inverter. In the inverter-driven fire pump system according to any one of claims 1 to 4,
An inverter-driven fire pump system characterized by using an inverter in which the inverter current is less than the rated current when operating at an inverter frequency f1 with a discharge amount of 150% and a total head of H65% or more. In the inverter-driven fire pump system according to any one of claims 1 to 5,
An inverter-driven fire pump system characterized in that the inverter frequency is limited so that the inverter current becomes equal to or lower than the rated current when the speed is increased by inverter frequency control. In the inverter-driven fire pump system according to any one of claims 1 to 6,
An inverter-driven fire pump system characterized by controlling the frequency to be equal to or less than the corresponding frequency (f1) of the discharge amount Q150% at the time of speed increase by inverter frequency control. In the inverter-driven fire pump system according to any one of claims 1 to 7,
The maximum target pressure set value is limited to be set to 140% or less of the fire pump, and control is performed so that the feed water pressure is 140% or less during the shutoff operation (when the discharge amount is 0). Inverter driven fire pump system. In the inverter-driven fire pump system according to any one of claims 1 to 8,
An inverter-driven fire pump system, wherein the inverter frequency f1 is set to a frequency higher than the commercial frequency when the inverter frequency f0 is close to the commercial frequency. In the inverter-driven fire pump system according to any one of claims 1 to 9,
An inverter-driven fire pump system characterized by controlling the pressure by switching the target pressure to H65% when the inverter frequency exceeds the frequency corresponding to the first specification point (f0) during acceleration by inverter frequency control.

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