JP2012161502A - Fire extinguishing pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire extinguishing pump system that causes no problems such as increase in a load on a water pipe, increase in unnecessary water drainage, and waste of energy.SOLUTION: The control device 4 of the fire extinguishing pump system includes a storage means 4a in which a plurality of target pressures corresponding to each floor or each story group of a building are stored. The control device 4 controls an inverter 3 so that the pressure on the discharge side of a fire extinguishing pump 1 may be maintained at a target pressure corresponding to a floor or a story group to which the floor belongs as specified by water discharge signals. When receiving a plurality of water discharge signals indicating that water is being discharged from water discharge devices 7, 20 in a plurality of floors or a plurality of story groups, the control device 4 controls the inverter 3 in a manner that the pressure on the discharge side of the fire extinguishing pump 1 is maintained at the highest target pressure corresponding to the highest floor or the highest story group stored in the storage means 4a.

Description

  The present invention relates to a fire extinguishing pump system including a fire extinguishing pump driven by an inverter.

  A fire pump system installed in a building is a fire extinguishing facility that performs initial fire extinguishing when a fire occurs in a building. When this fire pump system senses the occurrence of a fire, it sprinkles water from a sprinkler installed in the building to extinguish the fire. For example, Patent Literature 1 discloses an inverter-driven fire pump system. This system detects a pressure drop in a water supply pipe, a fire extinguishing pump that supplies water to a sprinkler provided on each floor of the building via a water supply pipe, a motor that drives the fire extinguishing pump, an inverter that controls the motor, and the like. Pressure detecting means for transmitting an operation signal, a discharge signal transmitting means group for transmitting a discharge signal for specifying a sprinkler that discharges water, and a control device for controlling the inverter based on the discharge signal.

  The inverter has storage means, and in this storage means, a plurality of operating frequencies for obtaining the water supply amount and the water supply pressure necessary for each sprinkler specified by the discharge signal are stored corresponding to each sprinkler. . The operating frequency is selected based on a signal from the pressure detection means or the discharge signal transmission means group. When an operation signal is transmitted from the pressure detection means and a plurality of discharge signals are transmitted from the discharge signal transmission means group, an operation frequency of 100% of the inverter is selected. The fact that an operation signal is transmitted from the pressure detection means and a plurality of emission signals are transmitted from the emission signal transmission means group indicates a possibility that the fire in the building is spreading. Therefore, in such a case, in order to obtain a sufficient water supply amount and water supply pressure for fire extinguishing, the inverter drives the motor and the fire pump with an operation frequency of 100%.

JP 2009-189700 A

  However, when a fire pump is operated at an operating frequency of 100%, an unnecessary pressure is generated, resulting in an increase in load on the water pipe, an increase in the amount of unnecessary discharge water, and waste of energy. Problems arise.

  The present invention has been made in view of the above-described conventional problems. Even when water is discharged from a water discharge device (sprinkler, fire hydrant, etc.) installed on a plurality of floors, an increase in load on the water supply pipe is unnecessary. An object of the present invention is to provide a fire extinguishing pump system that does not cause problems such as an increase in the amount of discharged water and waste of energy.

In order to achieve the above-described object, one aspect of the present invention provides a fire extinguishing pump that feeds water to a water discharger installed on each floor of a building via a water pipe, a motor that drives the fire extinguishing pump, When the water is discharged from the inverter that changes the rotation speed, the control device that controls the inverter, and the water discharge device of any floor, the water discharge signal including the water discharge floor information indicating the floor or the hierarchical group to which the floor belongs is provided. Water discharge signal transmission means for transmitting to the control device, the control device has storage means for storing a plurality of target pressures corresponding to each floor or each hierarchy group, the control device is the fire pump And controlling the inverter so that the pressure on the discharge side is maintained at a target pressure corresponding to the floor specified by the water discharge signal or the hierarchical group to which the floor belongs. When a plurality of water discharge signals indicating that water is discharged from a water discharge device in the floor or a plurality of hierarchy groups are received, the pressure on the discharge side of the fire pump is stored on the highest floor stored in the storage means or The fire pump system is characterized in that the inverter is controlled so as to be maintained at a maximum target pressure corresponding to a highest hierarchy group.
In a preferred aspect of the present invention, the control device drives the motor without going through the inverter when there is an abnormality in the inverter.

  Another aspect of the present invention includes a pump, a motor that drives the pump, an inverter that changes a rotation speed of the motor, and a control device that controls the inverter. Or it has the memory | storage means which memorize | stored the some target pressure corresponding to each hierarchy group, and when the said control apparatus is discharged from the water discharge apparatus of any floor, the hierarchy or the hierarchy group to which the floor belongs The inverter receives the water discharge signal including the water discharge floor information indicating that the pressure on the discharge side of the pump is maintained at the target pressure corresponding to the floor specified by the water discharge signal or the hierarchical group to which the floor belongs. When the control device receives a plurality of water discharge signals indicating that water is discharged from a water discharge device at a plurality of floors or a plurality of floor groups, the pressure on the discharge side of the fire pump Is a fire-extinguishing pump unit that controls the inverter so as to be maintained at the highest target pressure corresponding to the highest floor or the highest hierarchy stored in the storage means.

  According to the present invention, when water discharge is performed at a plurality of floors or a plurality of hierarchy groups, the fire extinguishing pump is operated at the highest target pressure corresponding to the highest hierarchy or the highest hierarchy group. By performing such pressure control operation, problems such as an increase in load on the water pipe, an increase in the amount of unnecessary discharged water, and waste of energy can be solved.

It is a mimetic diagram showing a fire pump system concerning one embodiment of the present invention. It is a schematic diagram which shows the fire pump system which concerns on other embodiment of this invention. It is a figure which shows the operation control flow of the fire-extinguishing pump system which concerns on embodiment shown in FIG. 1 and FIG. It is a graph showing an example of the pump operation performance curve in pressure constant control operation.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic view showing a fire pump system according to an embodiment of the present invention. FIG. 1 shows only the part from the fourth floor to the fourth floor of the building. As shown in FIG. 1, this fire pump system includes a fire pump 1 that feeds water through a water pipe 5 to a sprinkler 7 (also called a sprinkler head) as a water discharge device installed on each floor of the building, and the fire pump. 1 includes a motor 2 that drives 1, an inverter 3 that changes the rotational speed (frequency) of the motor 2, and a control device 4 that controls the inverter 3. The inverter 3 is installed in the control device 4.

  The suction port of the fire pump 1 communicates with a water tank 13 installed in the basement of the building via a suction pipe 15. The fire extinguishing pump 1 pumps up water in a water tank 13 that is a water source, and supplies the water to a sprinkler 7 through a water supply pipe 5. The control device 4 including the fire pump 1, the motor 2, and the inverter 3 is installed on the lowest floor of the building (in the example of FIG. 1, the fourth basement floor). The fire pump 1 is connected to a sprinkler 7 through a water pipe 5. The water pipe 5 has a main pipe 5a extending along the height direction of the building and branch pipes 5b installed on each floor. The discharge port of the fire pump 1 is connected to the main pipe 5a, and the sprinkler 7 is connected to the branch pipe 5b on each floor.

  A pressure sensor 9 for measuring the water pressure in the water supply pipe 5 is disposed at a position close to the discharge port of the fire pump 1. The pressure sensor 9 is a pressure detection means necessary for performing a pressure control operation of the fire pump 1. That is, the fire pump 1 is controlled such that the pressure measured by the pressure sensor 9 is maintained at a predetermined target pressure. A check valve 16 and a gate valve 17 are provided on the downstream side of the pressure sensor 9, and the pressure sensor 9 is disposed between the check valve 16 and the fire pump 1. The devices surrounded by the broken lines shown in FIG. 1 such as the control device 4 including the fire pump 1, the motor 2 and the inverter 3 and the pressure sensor 9 constitute the fire pump unit 21, and although not shown, It is desirable to be installed in. The pressure sensor 9 may be disposed on the downstream side of the check valve 16 or the gate valve 17.

  A pressure tank 10 is connected to the main pipe 5a. The pressure tank 10 is disposed on the downstream side of the check valve 16 and the gate valve 17. A gas chamber partitioned by a diaphragm is formed inside the pressure tank 10, and compressed gas is sealed in the gas chamber. The water sent into the pressure tank 10 is pressurized by a compressed gas pressure through a diaphragm. Therefore, even when the fire pump 1 is not operated, the water pressure in the water supply pipe 5 is held by the pressure tank 10. The pressure tank 10 is provided with pump activation signal transmission means 11 for detecting a pressure drop in the water supply pipe 5 and transmitting a pump activation signal. The pump activation signal transmission means 11 transmits a pump activation signal when the pressure in the water supply pipe 5 is reduced to a predetermined value. The pump activation signal is sent to the control device 4, and the control device 4 receives the pump activation signal and activates the fire extinguishing pump 1.

  The sprinkler 7 in the present embodiment is a so-called closed sprinkler 7. The sprinkler 7 is installed on the ceiling of each floor of the building. The opening at the tip of each sprinkler 7 is closed with a heat sensitive material (made of a fusible substance that is easily melted by heat) such as fuse metal, and when the heat sensitive material melts due to a fire, the tip of the sprinkler 7 The opening is opened, whereby water in the water pipe 5 is discharged from the sprinkler 7.

  The fire-extinguishing pump 1 is controlled by the control device 4 so that the pressure on the discharge side is maintained at a predetermined target pressure during operation. The target pressure is determined in advance according to the floor or hierarchy group of the building, and a plurality of target pressures corresponding to the floor or hierarchy group are stored in the storage unit 4 a of the control device 4. The hierarchy group is a hierarchy section composed of a plurality of hierarchies. For example, three floors are defined as one hierarchy group. A water discharge signal transmitting means 8 for transmitting a water discharge signal indicating that water is discharged from the sprinkler 7 is connected to the branch pipe 5b of each floor. The water discharge signal transmission means 8 detects a flow of water or a change in pressure in the branch pipe 5b and transmits a water discharge signal. The water discharge signal includes water discharge floor information indicating the floor of the sprinkler 7 that is discharging water or the hierarchical group to which the floor belongs.

  The water discharge signal transmission means 8 is connected to the control device 4 via a receiver 19 such as an automatic fire alarm facility. When there is water discharge from the sprinkler 7, a water discharge signal is transmitted from the water discharge signal transmission means 8 on the floor where the sprinkler 7 is disposed to the control device 4 via the receiver 19. When receiving a water discharge signal from the water discharge signal transmission means 8, the receiver 19 such as an automatic fire notification facility issues an alarm signal notifying the occurrence of a fire. The water discharge signal is further sent from the receiver 19 to the control device 4. The control device 4 can specify the floor where the water is discharged or the hierarchical group to which the floor belongs from the received water discharge signal. And the control apparatus 4 determines the target pressure for the operation control of the fire pump 1 based on the specified floor or hierarchy group.

  The fire pump 1 is operated as follows according to the constant pressure control. When a fire occurs, water is released from the sprinkler 7 and the pressure in the water pipe 5 decreases. When the pressure in the water supply pipe 5 decreases to a predetermined value, a pump activation signal is transmitted from the pump activation signal transmission means 11 to the control device 4. The control device 4 receives this pump activation signal and activates the fire extinguishing pump 1.

  When water is discharged from the sprinkler 7, a water discharge signal is sent to the control device 4 from the water discharge signal transmitting means 8 disposed on the same floor as the sprinkler 7. The control apparatus 4 specifies the floor or hierarchy group in which the fire has occurred from the received water discharge signal. As described above, the storage unit 4a of the control device 4 stores a plurality of target pressures corresponding to each floor or each hierarchical group. These target pressures are pressures required for pumping water to each floor or each group of floors. The control device 4 specifies a floor or a hierarchy group from which water is discharged from the sprinkler 7, and determines a target pressure corresponding to the specified floor or hierarchy group.

  Further, the pressure in the main pipe 5 a of the water supply pipe 5, that is, the pressure on the discharge side of the fire pump 1 is measured by the pressure sensor 9. The pressure sensor 9 may be used to generate a pump activation signal instead of the pump activation signal transmission means 11. For example, the fire pump 1 is activated when the pressure sensor 9 continuously detects a pressure less than a predetermined pressure for a predetermined time. (However, in this case, the pressure sensor 9 needs to be installed on the downstream side of the check valve 16). The information processing unit 4b of the control device 4 calculates the operating frequency command value so that the pressure measured by the pressure sensor 9 is maintained at the determined target pressure. The inverter 3 drives the motor 2 in accordance with the calculated operation frequency command value, whereby the fire pump 1 is operated at a given operation frequency (rotational speed).

  When a plurality of sprinklers 7 disposed on the same floor or the same floor group are discharging water, the flow rate of the discharged water increases, and the discharge side pressure of the fire pump 1 measured by the pressure sensor 9 decreases. . The control device 4 changes the operating frequency of the fire pump 1 via the inverter 3 so that the pressure measured by the pressure sensor 9 is maintained at the target pressure.

  When a fire spreads in a building, the sprinkler 7 may act on a plurality of floors or a plurality of hierarchical groups to discharge water. In such a case, a plurality of water discharge signals are transmitted to the control device 4 from the water discharge signal transmitting means 8 installed on a plurality of floors. In this way, when a plurality of sprinklers 7 arranged on a plurality of floors or a plurality of hierarchical groups discharge water, the maximum target pressure corresponding to the highest floor or the highest hierarchical group is controlled at a constant pressure in order to prevent the spread of fire. Used for. That is, when receiving a plurality of water discharge signals indicating that water discharge is being performed on a plurality of floors or a plurality of floor groups, the control device 4 can control the fire pump without regard to the floor on which the sprinkler 7 is discharging water. The operating frequency of the fire pump 1 is changed so that the discharge side pressure of 1 is maintained at the maximum target pressure.

  FIG. 2 is a schematic view showing a fire pump system according to another embodiment of the present invention. The embodiment shown in FIG. 1 and the embodiment shown in FIG. 2 have a common basic configuration, but in the embodiment shown in FIG. 2, a fire hydrant 20 is used instead of the sprinkler 7 as a water discharge device. Further, in this embodiment, the pressure tank 10 and the pump activation signal transmission means 11 are not provided, the fire extinguishing pump 1 is activated by a remote activation signal input from a disaster prevention center or the like, and then a receiver such as an automatic fire alarm facility. Control is carried out using a water discharge signal sent via 19. It is also possible to install the pressure sensor 9 downstream of the check valve 16 and use the pressure sensor 9 for constant pressure control as the pump activation signal transmission means. Also in the present embodiment, the devices surrounded by broken lines shown in FIG. 2 constitute the fire extinguishing pump unit 21 and are preferably installed on a common base (not shown).

  The fire hydrant 20 is a so-called indoor fire hydrant installed on each floor of a building. Each fire hydrant 20 includes a hose with a nozzle attached to the tip, an open / close valve for feeding water into the hose, and the like. These hoses and on-off valves are accommodated in the cabinet. As in the embodiment of FIG. 1, a water discharge signal transmitting means 8 for transmitting a water discharge signal indicating that water has been discharged from the fire hydrant 20 is installed in the branch pipes 5 b on each floor. The water discharge signal from the water discharge signal transmission means 8 is sent to the control device 4 via a receiver 19 such as an automatic fire alarm facility.

  In the event of a fire, the electrical system may be damaged by a fire or other factors (earthquake, etc.), causing a power outage. In preparation for such a situation, the fire pump system shown in FIGS. 1 and 2 has a backup system having an emergency power supply in addition to the main power supply. When a power failure occurs, the power supply is switched from the main power supply to the emergency power supply, and the fire pump system operates with the power supplied from the emergency power supply.

  FIG. 3 is a diagram showing an operation control flow of the fire pump system according to the embodiment shown in FIGS. 1 and 2. When the power supply from the main power supply or the power supply from the emergency power supply is started after recovering from the power failure (step 1), it is confirmed whether the operation holding relay (not shown) is ON or OFF ( Step 2). This operation holding relay is a relay having a mechanical holding mechanism, and is configured to be able to hold the operation state of the fire pump 1 before a power failure. If this operation holding relay is ON, the operation state before the power failure is continued (step 3). On the other hand, if the operation holding relay is OFF, the pump start condition is confirmed (step 4).

The pump start conditions in step 4 are the following three, and the fire pump 1 is started when any one of these three conditions is satisfied.
(1) Remote signal input from disaster prevention centers.
(2) The start switch on the operation panel is turned on.
(3) Pump activation signal input from the pump activation signal transmission means 11 (when the pressure sensor 9 functions as the pump activation signal transmission means, the pump activation signal is input from the pressure sensor 9).

  If none of the pump start conditions is satisfied, the confirmation of the pump start condition in step 4 is repeated. On the other hand, when any one of the pump start conditions is satisfied, it is confirmed whether or not the operation conditions are satisfied, that is, whether or not a water discharge signal is received (step 5). When the water discharge signal is received, it is confirmed whether or not a plurality of water discharge signals are transmitted from a plurality of floors or a plurality of hierarchical groups (step 6). On the other hand, when the water discharge signal is not received in step 5, the fire extinguishing pump 1 is operated at the highest target pressure corresponding to the highest floor or the highest floor group (step 7). That is, the constant pressure control operation is performed so that the discharge side pressure of the fire pump 1 is maintained at the maximum target pressure. Also, when a plurality of water discharge signals are transmitted from a plurality of floors or a plurality of hierarchical groups, the fire pump 1 is similarly operated at the highest target pressure corresponding to the highest floor or the highest hierarchical group as described above.

  If the water discharge signal is not transmitted from the plurality of floors or the plurality of floor groups, the fire pump 1 is operated at the target pressure corresponding to the floor or the floor group specified by the received water discharge signal (step 8). Next, it is checked whether there is any abnormality in the inverter 3 or whether the power is supplied from an emergency power source such as a private power generator or a storage battery facility (step 9). If there is an abnormality in the inverter 3 or power is supplied from the emergency power supply, the fire pump 1 is operated according to the backup operation mode (step 10). In this backup operation mode, the motor 2 is directly operated by the main power supply or the emergency power supply without going through the inverter 3 (the operation frequency at this time corresponds to the 100% frequency of the inverter 3). Note that the processing of step 9 and step 10 may be configured to be performed between step 4 and step 5.

When the inverter 3 is operating normally and power is not supplied from the emergency power supply, the control device 4 checks whether or not the stop condition of the fire pump 1 is satisfied. The stop conditions of the fire pump 1 are the following four conditions, and when any one of these four conditions is satisfied, the operation of the fire pump 1 is stopped.
(I) Remote signal input from the disaster prevention center, etc. is stopped, and the stop switch on the operation panel is turned on.
(Ii) When the start switch on the operation panel is ON, the stop switch on the operation panel is ON.
(Iii) The main power supply is cut off. (Iv) In the case of the fire extinguishing pump system shown in FIG. 1, the start signal of the pump start transmission means 11 is stopped and the stop switch on the operation panel is turned ON.

  When any one of the above four stop conditions is satisfied, the operation of the fire pump 1 is stopped (step 12). On the other hand, when none of the above four conditions is satisfied, the processing step returns to step 4 and it is confirmed again whether or not the start condition of the fire pump 1 is satisfied. When the fire pump 1 is stopped, the processing step returns to step 2 and it is confirmed whether the operation holding relay is ON or OFF.

  FIG. 4 is a graph showing an example of a pump operation performance curve in the constant pressure control operation. As shown in FIG. 4, target pressures F1 to F9 corresponding to water discharge signals (indicated by 1CH to 9CH) for each floor of the building or for each hierarchical group are preset. These target pressures F1 to F9 are stored in the storage unit 4a of the control device 4 in association with the water discharge signals 1CH to 9CH, respectively. The water discharge signal 1CH corresponds to the first floor or the first layer group (the lowest layer group) of the building, and the water discharge signal 9CH corresponds to the ninth floor or the ninth layer group of the building. In this example, target pressures F1 to F9 corresponding to each floor from the first floor to the ninth floor of the building or each of the first to ninth floor groups are provided.

  The operation frequency (that is, the rotation speed) of the fire pump 1 is controlled by the control device 4 so that the actual pressure measured by the pressure sensor 9 installed in the main pipe 5a of the water supply pipe 5 is maintained at the target pressure. . Specifically, when water is discharged from a plurality of water discharge devices (sprinkler 7 or fire hydrant 20) on the same floor or the same level group, the pressure measurement value obtained from the pressure sensor 9 is the floor where the water discharge is performed. Alternatively, the operation of the fire pump 1 is controlled so that the target pressure corresponding to the hierarchy group is maintained.

  On the other hand, when a plurality of water discharge signals are transmitted from a plurality of floors or a plurality of hierarchy groups, the highest target pressure corresponding to the highest floor or the highest hierarchy group (in the example of FIG. 4, the target corresponding to the release signal 9CH). The fire pump 1 is controlled so that the pressure measurement value is maintained at the pressure F9). As can be seen from FIG. 4, the target pressure F9 corresponding to the highest floor or the highest floor group is lower than the highest frequency (100% frequency) of the inverter 3 indicated by a dotted line. Therefore, compared to the case where the inverter 3 is operated at a 100% frequency, excessive pressure is not applied to the water supply pipe 5, unnecessary water discharge can be avoided, and further, an energy saving effect is realized.

  The embodiment described above is described for the purpose of enabling the person having ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the present invention is not limited to the described embodiments, but is to be construed in the widest scope according to the technical idea defined by the claims.

DESCRIPTION OF SYMBOLS 1 Fire extinguishing pump 2 Motor 3 Inverter 4 Control apparatus 5 Water supply pipe 7 Sprinkler (water discharge device)
8 Water discharge signal transmission means 9 Pressure sensor (pressure detection means)
10 Pressure tank 11 Pump activation signal transmission means 13 Water tank (water source)
20 Fire hydrant (water discharge device)
21 Fire pump unit

Claims (2)

A fire extinguishing pump that sends water to a water discharge device installed on each floor of the building via a water pipe;
A motor for driving the fire pump,
An inverter for changing the rotational speed of the motor;
A control device for controlling the inverter;
A water discharge signal transmitting means for transmitting a water discharge signal including water discharge floor information indicating a floor group to which the floor or the floor belongs when the water is discharged from the water discharge device of any floor;
The control device has storage means for storing a plurality of target pressures corresponding to each floor or each hierarchical group,
The control device controls the inverter so that the pressure on the discharge side of the fire pump is maintained at a target pressure corresponding to a floor specified by the water discharge signal or a hierarchical group to which the floor belongs,
When the control device receives a plurality of water discharge signals indicating that water is discharged from a water discharge device at a plurality of floors or a plurality of hierarchical groups, the pressure on the discharge side of the fire pump is stored in the storage means. The fire extinguishing pump system is characterized in that the inverter is controlled so as to be maintained at a maximum target pressure corresponding to the highest floor or the highest floor group.   The fire pump system according to claim 1, wherein the control device drives the motor without going through the inverter when the inverter has an abnormality.

Images