JP2018107970A - Extinction pump unit and control method for extinction pump unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extinction pump unit capable of cancelling a pump lock state by inhibiting a load from being applied to a motor.SOLUTION: An extinction pump unit 1 comprises: a motor 21 for performing rotary drive using rated current; a rotation shaft 22 connected to the motor 21; a pump 23 connected to the rotation shaft 22, the pump having a pump casing 31; a mechanical seal 32 for performing shaft-sealing on a gap between the rotation shaft 22 and the pump casing 31; detection means 81 for detecting abnormality of the motor 21 caused by adherence of the mechanical seal 32; and a control section 84 that supplies power to the motor 21 and, when power is supplied to the motor 21 and abnormality of the motor 21 is detected by the detection means 81, stops power supply to the motor 21 and supplies power to the motor 21 after a predetermined period of time.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fire extinguishing pump unit capable of supplying water to a water discharge means in the event of a fire.

  There is known a fire pump unit that supplies water to a water discharge means such as a fire hydrant or a sprinkler head in the event of a fire in a building such as a building. In such a fire pump unit, when information on the fire is input from a fire alarm or the like to the control panel at the time of a fire, the fire pump is driven and water supply to the water discharge means is started.

  In addition, as such a fire pump unit, a plurality of fire pumps are connected in series when the fire pump is used in a technique for variable speed control by an inverter based on the pressure on the discharge side of the fire pump or in a high-rise building or the like. Techniques and the like are known (see, for example, Patent Document 1).

JP 2006-034529 A

  The fire pump unit as described above has the following problems. That is, since the fire pump unit is a device that is driven in the event of a fire, the drive frequency is very low. For this reason, depending on the water quality, there is a possibility that a mechanical seal used for the fire extinguishing pump is fixed and the fire extinguishing pump is not driven, that is, a so-called pump lock state.

  However, since such a fire-extinguishing pump unit is required to start reliably in the event of a fire, a technique capable of releasing the pump lock state is required. For example, as a technique for releasing the pump lock state, a technique is also known in which power supply to the motor is continued until the mechanical seal is released in the pump lock state. However, when electric power is supplied to the motor in the pump lock state, a current higher than a predetermined current is supplied, so that a load is applied to the motor.

  Then, this invention is providing the fire-extinguishing pump unit which can suppress that a load is added to a motor and can cancel | release a pump lock state.

  According to an aspect of the present invention, a fire-extinguishing pump unit includes a motor that is rotationally driven at a rated current, a rotary shaft that is connected to the motor, a pump that is connected to the rotary shaft and includes a pump casing, and the rotary shaft. And a mechanical seal that seals the shaft between the pump casing, detection means for detecting rotation and stop of the motor, and supplying current to the motor and supplying current to the motor, the detection And a controller that stops supplying the electric power to the motor when the stop of the motor is detected by the means, and supplies a current to the motor after a predetermined time.

  According to one aspect of the present invention, a control method for a fire extinguishing pump unit is such that a current is supplied by a control unit to a motor that is driven to rotate at a rated current and that is connected to a rotary shaft provided with a mechanical seal between the pump and the pump. When the detection means detects rotation and stop of the motor, and the detection means detects stop of the motor, the control unit stops supplying the power to the motor, and the power to the motor After a predetermined time elapses after the supply is stopped, the controller supplies current to the stopped motor.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the fire-extinguishing pump unit which can suppress that a load is added to a motor and can cancel | release a pump lock state.

Explanatory drawing which shows the structure of the fire extinguishing equipment in which the fire-extinguishing pump unit which concerns on the 1st Embodiment of this invention is used. The side view which shows the structure of the fire extinguishing pump unit. Sectional drawing which shows the structure of the mechanical seal used for the fire-extinguishing pump unit. The flowchart which shows an example of control of the fire-extinguishing pump unit. The side view which shows the structure of the fire-extinguishing pump unit which concerns on the 2nd Embodiment of this invention. The flowchart which shows an example of control of the fire-extinguishing pump unit.

(First embodiment)
FIG. 1 is an explanatory diagram showing the configuration of a fire extinguishing facility 100 in which a fire pump unit 1 according to an embodiment of the present invention is used, FIG. 2 is a side view showing the configuration of the fire pump unit 1, and FIG. Sectional drawing which shows the structure of the mechanical seal 32 used, FIG. 4 is a flowchart which shows an example of control of a fire pump unit.

  As shown in FIG. 1, the fire-extinguishing pump unit 1 is used for the fire-extinguishing equipment 100 provided in the building, for example. The fire extinguishing equipment 100 includes a fire extinguishing pump unit 1 and water discharge means 110 connected to the fire extinguishing pump unit 1.

  As shown in FIGS. 1 and 2, the fire-extinguishing pump unit 1 includes a base 10, a fire-extinguishing pump 11, a suction pipe 12, a discharge pipe 13, a priming water means 14, a draining water means 15, and a reserve water source 16. And a pressure detector 17 and a control panel 18. The fire pump unit 1 is connected to a water supply source C such as a water storage tank or a water main through a suction pipe 12.

  As shown in FIG. 2, the base 10 supports the fire extinguishing pump 11, the priming means 14, and the control panel 18. The base 10 is fixed to an installation surface on which the fire pump unit 1 is installed.

  One or more fire extinguishing pumps 11 are provided. In the present embodiment, description will be made using a configuration in which a single fire pump 11 is provided. As shown in FIG. 2, the fire extinguishing pump 11 includes a motor 21, a rotary shaft 22 connected to the motor 21, and a pump 23 connected to the rotary shaft 22. The fire pump 11 is provided with valves such as a check valve 24 and an on-off valve on the secondary side of the pump 23. The fire pump 11 may include a pressure vessel capable of accumulating pressure on the secondary side of the pump 23.

  The motor 21 is connected to the control panel 18 via a signal line S. Electric power is supplied to the motor 21 from the control panel 18. The motor 21 is configured to be capable of being driven by being supplied with rated current power. The motor 21 has a stator and a rotor in the casing 21a. The rotating shaft 22 is fixed to the motor 21 and the pump 23. The rotating shaft 22 includes, for example, a first shaft that is directly fixed to the rotor of the motor 21, a second shaft that is directly fixed to the pump 23, and a coupling that connects the first shaft and the second shaft. Is done.

  The pump 23 is configured to be able to discharge an amount of water equal to or greater than the maximum amount of water discharged from the water discharge means 110 by the fire extinguishing equipment 100. The pump 23 is, for example, a multistage pump having a plurality of impellers. The pump 23 includes a pump casing 31, a plurality of impellers housed in the pump casing 31 and connected to the rotary shaft 22, and a mechanical seal 32 that seals between the pump casing 31 and the rotary shaft 22. .

  As shown in FIGS. 1 to 3, the pump casing 31 includes a pump chamber that houses a plurality of impellers, a hole portion 31 a into which the rotating shaft 22 is inserted, a seal chamber 31 b that houses a mechanical seal 32, Configure. The pump casing 31 is configured by assembling a plurality of members integrally. A lubricant 32a that lubricates the mechanical seal 32 is stored in the seal chamber 31b. On the inner surface of the pump casing 31 constituting the seal chamber 31b, two seal grooves 31c provided around the hole 31a and fixing a part of the mechanical seal 32 are provided.

  The mechanical seal 32 seals between the seal chamber 31 b of the pump casing 31 and the rotary shaft 22. The mechanical seal 32 is configured to prevent water leakage from the pump 23 to the seal chamber 31b, leakage of the lubricant 32a from the seal chamber 31b to the outside and the pump casing 31, and entry of water and the like from the outside to the seal chamber 31b. The

  Specifically, the mechanical seal 32 is fixed to the two seal grooves 31 c provided in the seal chamber 31 b of the pump casing 31, and the fixed ring 41. And two rotating rings 42 that slide each other, and a biasing member 43 that constantly presses the rotating ring 42 toward the fixed ring 41.

  The fixed ring 41 includes a sliding portion 41a that forms an annular sliding surface that slides with the rotating ring 42, and a static seal portion 41b that seals the seal groove 31c and the surface that contacts the sliding portion 41a. I have.

  The inner surface of the rotating ring 42 is in contact with the rotating shaft 22, the surface in contact with the rotating shaft 22 is sealed, and the end surface thereof is formed to be slidable with the sliding portion 41 a. The rotation of the rotating ring 42 is restricted or fixed in the circumferential direction of the rotating shaft 22 so as to be able to rotate following the rotation of the rotating shaft 22. In addition, the rotating ring 42 has a seat portion 42 a that supports the biasing member 43 in a part thereof.

  The urging member 43 is a coil spring that is provided between the seat portions 42 a of the two rotating rings 42 and is formed so as to be able to urge the rotating rings 42 toward the sliding portion 41 a of the fixed ring 41. That is, the urging member 43 always presses the two rotating rings 42 fixed to the rotating shaft 22 toward the sliding portion 41a with a predetermined pressing force.

  Such a mechanical seal 32 has a so-called two-stage structure having two stationary rings 41 and two rotating rings 42 in a seal chamber 31b of a pump casing 31 in which lubricating oil is stored. The mechanical seal 32 seals the seal groove 32c and the sliding portion 41a of the pump casing 31 with a static seal portion 41b, and rotates between the outer surface of the rotating shaft 22 and the inner peripheral surface of the rotating ring 42. The ring 42 is sealed by close contact, and the space between the sliding portion 41 a and the rotating ring 42 is sealed by sliding of the sliding portion 41 a and the rotating ring 42. Thereby, the mechanical seal 32 seals between the rotating shaft 22 and the pump casing 31.

  The exhalation means 14 branches from the discharge pipe 13 and is connected to the fire extinguishing pump 11. The expiratory means 14 is disposed at a higher position than the fire pump 11. The exhalation means 14 is configured to be able to fill the pump casing 31 of the pump 23 with exhalation water during the initial operation of the fire pump 11. Such a priming means 14 has, for example, a priming tank 51 for storing priming water. Further, the expiratory means 14 includes an on-off valve 52 provided between the expelling tank 51 and the discharge pipe 13 and a check valve 53 that prevents water flow from the fire pump 11 to the expelling means 14. ing.

  The escape water means 15 includes a relief water pipe 61 branched from the discharge pipe 13 and connected to the fire extinguishing pump 11, a check valve 62 provided in the relief water pipe 61, and an on-off valve 63. . Further, in the escape water means 15, the relief water pipe 61 is disposed in the drainage part D, and when the check valve 62 and the on-off valve 63 are opened, the water increased in pressure by the fire extinguishing pump 11. Is formed so that it can escape to the drainage part D. The on-off valve 63 is an electromagnetic valve that is opened and closed by the control panel 18, and is formed so as to be able to drain into the drainage part D by opening when the inside of each pipe becomes a predetermined pressure or higher.

  The reserve water source 16 is provided, for example, on the rooftop of a building and is connected to the discharge pipe 13. The reserve water source 16 is, for example, an elevated tank or the like, and is formed to allow water to flow into the discharge pipe 13 when the pressure of the water discharged from the fire extinguishing pump 11 decreases. In other words, the reserve water source 16 is provided with a check valve 71. Thereby, the reserve water source 16 opens the check valve 71 when the water pressure of the reserve water source 16 is higher than the water pressure discharged from the fire extinguishing pump 11, and supplies the water of the reserve water source 16 into the discharge pipe 13. To do.

  The pressure detector 17 is formed so as to be able to detect the pressure of water in the discharge pipe 13. The pressure detector 17 is connected to the control panel 18 by a signal line S. The pressure detector 17 is configured to transmit the detected pressure value to the control panel 18.

  The control panel 18 has a power cable K connected to a power source or the like that supplies power, and power is supplied to the control panel 18 via the power cable K. The control panel 18 includes a detection unit 81, an alarm unit 82, a storage unit 83, and a control unit 84.

  The detecting means 81 is configured to detect the rotation of the motor 21. Specifically, the detection means 81 is configured to be able to detect whether the motor 21 is not rotating or whether the motor 21 is rotating at a predetermined number of rotations or less. For example, the detection means 81 is a current sensor 81 a that detects a current value flowing through the motor 21. The current sensor 81 a is configured to convert the detected current value flowing through the motor 21 into a signal and transmit the signal to the control unit 84.

  The alarm means 82 is configured to be able to notify the abnormality to the outside when an abnormality occurs in the fire pump 11. For example, the alarm unit 82 issues an alarm by sound or light when the fire pump 11 is abnormal.

  The storage unit 83 stores a threshold for determining that the motor 21 is abnormal when the fire pump unit 1 is driven, and a restart time until the motor 21 having a rotation speed equal to or lower than the threshold is restarted. Yes. In the present embodiment, the threshold value is a first threshold value of the current value determined as an overcurrent that is a current value higher than the rated current, a current value higher than the first threshold value, and the mechanical seal 32. And the second threshold value of the current value that is determined to be a restraining current that determines that a load is applied to the rotating shaft 22. That is, the second threshold value is a current value for determining an abnormality of the motor 21 caused by the mechanical seal 32.

  The control unit 84 is configured to be able to supply power to the motor 21 via the signal line S so that the motor 21 can be driven and stopped. When an external start signal for instructing the start of the motor 21 is input from the outside, or when a manual start signal for instructing the start of the motor 21 is input by the operator, the control unit 84 has a predetermined rotation speed. Power of the rated current is supplied to the motor 21 so that the motor 21 is driven, and the motor 21 is started. The control unit 84 receives the detection data transmitted from the pressure detector 17 and controls the driving and stopping of the motor 21. The controller 84 opens and closes the open / close valve 63 of the water discharge means 15 based on the pressure or water temperature of the discharge pipe 13.

  When the current value of the motor 21 detected by the current sensor 81a is equal to or greater than the first threshold value, the control unit 84 determines that the fire pump 11 is abnormal, and has a function of alarming the information to the outside by the alarm unit 82. .

  The control unit 84 determines that the mechanical seal 32 is fixed when the current value detected by the current sensor 81a is equal to or greater than the first threshold value and equal to or greater than the second threshold value, and the motor The motor 21 has a function of repeatedly stopping and restarting the motor 21 until the current value of the motor 21 becomes lower than the second threshold value.

  Specifically, the control unit 84 detects the current value of the motor 21 detected by the current sensor 81a at the start of the motor 21, compares the transmitted current value of the motor 21 with the second threshold value, and is detected by the current sensor 81a. If the current value is greater than or equal to the second threshold value, it is determined that the mechanical seal 32 is fixed and the rotating shaft 22 is not rotating or is slower than a predetermined rotational speed. After the determination, the control unit 84 stops the supply of power to the motor 21 and starts the motor 21 again after a predetermined time stored in the threshold value has elapsed after the stop. The control unit 84 repeatedly stops and restarts the motor 21 until the current value detected by the current sensor 81a becomes equal to or less than the second threshold value.

  The water discharge means 110 is constituted by, for example, a plurality of water dischargers, for example, sprinklers 111 provided for each floor F of the building. The sprinkler 111 is branched and connected from the discharge pipe 13 and has an arrangement pipe 112 arranged on each floor. The sprinkler 111 is provided between a plurality of sprinkler heads 113 provided for each floor F provided on the arrangement pipe 112, and between the arrangement pipe 112 and the sprinkler head 113, and detects water amount (flow rate) and pressure. And a detector 114 capable of

  In the event of a fire, the sprinkler head 113 has a water outlet that can be discharged to the floor of a building, for example, by opening and discharging water with heat during a fire. Further, the sprinkler head 113 is formed so that when one of the sprinkler heads 113 provided on the same floor is opened and discharged, the other sprinkler heads 113 provided on the same floor are also opened and interlocked to discharge water. ing.

  The detector 114 is connected to the control panel 18 via the signal line S. The detector 114 is formed so as to be able to detect, for example, the pressure of the arrangement pipe 112, the open / close state of the sprinkler head 113, and the flow rate. The detector 114 can detect the water discharge state of the water discharge means 110 from at least one of the pressure, the flow rate, and the open / close state of the sprinkler head 113, and can transmit detection data such as the water discharge state, pressure, flow rate and the like to the control panel 18. Is formed.

  Next, an example of the control of the fire-extinguishing pump unit 1 of the fire-extinguishing equipment 100 during a fire will be described with reference to the flowchart of FIG.

  As shown in FIG. 4, the control unit 84 monitors whether an external start signal is input (step ST1) and whether a manual start signal is input (step ST2). When the external start signal and the manual start signal are not input (NO in step ST1, NO in step ST2), the control unit 84 continues monitoring until the signal is input.

  When an external start signal is input (YES in step ST1) or a manual start signal is input (YES in step ST2), the control unit 84 supplies power with a rated current to the motor 21, and the pump 23 Is started (step ST3).

  After starting the pump 23, the control unit 84 compares the current value of the motor 21 detected by the current sensor 81a with the first threshold value, and determines whether or not the detected current value is an overcurrent (step). ST4). If the detected current value is lower than the first threshold value, that is, if the detected current value is not an overcurrent (NO in step ST4), it is determined whether or not the fire fighting activity can be stopped (step ST5). ). When the fire fighting activity is continued (NO in step ST5), the process returns to step ST4. If the fire fighting activity can be stopped (YES in step ST5), the power supply to the motor 21 is stopped and the pump 23 is stopped (step ST6).

  In step ST4, when the detected current value is greater than or equal to the first threshold, that is, when the detected current value is an overcurrent (YES in step ST4), the control unit 84 controls the alarm unit 82. Then, the fact that there is an abnormality in the fire extinguishing pump 11 is reported to the outside (step ST7).

  Next, the control unit 84 determines whether or not the detected current value is a binding current (step ST8). If the detected current value is lower than the second threshold value, that is, if the detected current value is not a restraint current (NO in step ST8), it is determined whether or not the fire fighting activity can be stopped as step ST5. To do.

  When the detected current value is greater than or equal to the second threshold, that is, when the detected current value is a restraint current (YES in step ST8), the control unit 84 stops supplying power to the motor 21. Then, the pump 23 is stopped (step ST9). Next, the control unit 84 stops the pump 23, waits for a predetermined time stored in the storage unit 83 (step ST10), supplies power to the motor 21 again after the predetermined time elapses, and starts the pump 23. (Step ST3). Thereafter, these steps are repeated until the fire fighting activity is stopped (YES in step ST5).

  According to the fire-extinguishing pump unit 1 used in the fire-extinguishing equipment 100 configured as described above, when the current value of the motor 21 is a restraint current equal to or greater than the second threshold value, the mechanical seal 32 is fixed and the rotation of the rotary shaft 22 is performed. Therefore, the motor 21 can be stopped and restarted. Thus, it becomes possible to relieve the pump lock state by repeating the stop and start of the motor 21.

  For this reason, even if the mechanical seal 32 is fixed, the fire-extinguishing pump unit 1 can release the fixing and supply water to the water discharge means 110 even if the mechanical seal 32 is fixed. In addition, the fire pump unit 1 can release the sticking of the mechanical seal 32 rather than continuing the power supply to the motor 21 by repeatedly stopping and starting the motor 21 when the mechanical seal 32 is stuck. And overcurrent can be prevented from flowing through the motor 21 continuously. As a result, the fire pump unit 1 can prevent the fire pump 11 from being damaged and can have high reliability.

  Moreover, in order to determine the adhering of the mechanical seal 32, since the current sensor 81a provided in the control panel 18 is used in the past, it is not necessary to add a new structure, thereby increasing the manufacturing cost. There is nothing.

  As described above, according to the fire-extinguishing pump unit 1 used in the fire-extinguishing equipment 100 according to the first embodiment of the present invention, it is possible to suppress the load from being applied to the motor 21 and to release the pump lock state.

(Second Embodiment)
Next, the structure of the fire-extinguishing pump unit 1A used for the fire-extinguishing equipment 100 according to the second embodiment will be described with reference to FIGS. 5 and 6.
Note that in the fire pump unit 1A according to the second embodiment, the same reference numerals are given to the same components as those of the fire pump unit 1 according to the first embodiment described above, and the detailed configurations thereof are omitted.

  The fire extinguishing equipment 100 includes a fire extinguishing pump unit 1A and water discharge means 110 connected to the fire extinguishing pump unit 1A.

  As shown in FIGS. 1 and 5, the fire pump unit 1 </ b> A includes a base 10, a fire pump 11, a suction pipe 12, a discharge pipe 13, a priming means 14, a drainage means 15, and a reserve water source 16. And a pressure detector 17 and a control panel 18A. The fire pump unit 1 </ b> A is connected to a water supply source C such as a water storage tank or a water main through a suction pipe 12.

  The control panel 18A has a power cable K. The control panel 18A includes a detection unit 81A, an alarm unit 82, a storage unit 83, and a control unit 84.

  The detection means 81A is configured to be able to detect the rotation of the motor 21. Specifically, the detection unit 81A is configured to be able to detect whether the motor 21 is not rotating or whether the motor 21 is rotating at a predetermined number of rotations or less. The detection unit 81A includes a current sensor 81a and a rotation sensor 81b that can detect the number of rotations of the rotary shaft 22.

  The rotation sensor 81 b is configured to convert the detected rotation speed of the rotating shaft 22 into a signal and transmit the signal to the control unit 84. The rotation sensor 81b is, for example, a pulse encoder. The rotation sensor 81b is connected to the control unit 84 via the signal line S, for example.

  The storage unit 83 stores a threshold for determining that the motor 21 is abnormal when the fire pump unit 1 is driven, and a restart time until the motor 21 having a rotation speed equal to or lower than the threshold is restarted. Yes. In addition to the first threshold value and the second threshold value, the threshold value is lower than the rotation number at the time of driving with the rated current of the motor 21, and the fire pump 11 discharges a sufficient amount of water from the water discharge means 110. It includes a third threshold value that is the number of revolutions that is determined to be an abnormally low speed.

  When the current value detected by the current sensor 81a is equal to or greater than the first threshold value and less than the second threshold value, and the rotation number detected by the rotation sensor 81b is equal to or less than the third threshold value, the control unit 84 The function of repeating the stop and restart of the motor 21 until it is determined that the mechanical seal 32 is fixed and the current value of the motor 21 is lower than the second threshold and the rotational speed is higher than the third threshold. Have.

  Next, an example of the control of the fire extinguishing facility 100 when the fire pump unit 1A is in fire will be described with reference to the flowchart of FIG. In addition, the detailed description is abbreviate | omitted about the process similar to an example of the control at the time of the fire of the fire extinguishing pump unit 1 which concerns on 1st Embodiment mentioned above.

  As shown in FIG. 6, the control unit 84 determines whether or not the detected current value is a binding current (step ST8), and the detected current value is lower than the second threshold value, that is, is not a binding current. In the case (NO in step ST8), it is determined whether or not the rotational speed of the motor 21 is an abnormally low speed (step ST11). If the detected rotational speed is higher than the third threshold value, that is, if the detected rotational speed is not abnormally low (NO in step ST11), it is determined in step ST5 whether or not the fire fighting activity can be stopped. Judgment is performed, and the same process is repeated thereafter.

  Further, when the detected rotational speed is equal to or lower than the third threshold value, that is, when the detected rotational speed is an abnormally low speed (YES in step ST11), the pump 23 is stopped as step ST9, and thereafter the same Repeat the process.

  According to the fire-extinguishing pump unit 1A used in the fire-extinguishing equipment 100 configured as described above, similarly to the fire-extinguishing pump unit 1 described above, it is possible to suppress the load from being applied to the motor and to release the pump lock state. Further, even if the current value of the motor 21 is lower than the second threshold value, the fire pump unit 1A further detects the rotational speed of the rotary shaft 22 with the rotation sensor 81b, and from this rotational speed, the mechanical seal 32 is detected. Can be determined. As a result, even if it is determined that the mechanical seal 32 is not fixed, it is possible to release the fixation of the mechanical seal 32 by further determining whether the mechanical seal 32 is fixed based on the rotational speed. It becomes. For this reason, the fire-extinguishing pump unit 1 can suppress a load from being applied to the motor 21, can release the pump lock state, and can obtain higher reliability.

  In addition, this invention is not limited to each embodiment mentioned above. For example, the fire pump unit 1 may be configured to include a plurality of fire pumps 11. Moreover, although the fire pump unit 1, 1A demonstrated the structure which has the current sensor 81a as the detection means 81 in the control panel 18, or the structure which has the current sensor 81a and the rotation sensor 81b, it is not limited to this. For example, a configuration in which only the rotation sensor 81b is used as the detection unit 81 that determines abnormality of the motor 21 may be used. In this case, the fire-extinguishing pump unit 1 may compare the rotation speed detected by the rotation sensor 81b with the third threshold value and determine the abnormality of the motor 21 caused by the mechanical seal 32.

  In addition, this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not deviate from the summary. Further, the embodiments may be implemented in combination as appropriate, and in that case, the combined effect can be obtained. Furthermore, the present invention includes various inventions, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and an effect can be obtained, the configuration from which the constituent requirements are deleted can be extracted as an invention.

  DESCRIPTION OF SYMBOLS 1 ... Fire pump unit, 10 ... Base, 11 ... Fire pump, 12 ... Suction pipe, 13 ... Discharge pipe, 14 ... Expiration means, 15 ... Escape water means, 16 ... Reserve water source, 17 ... Pressure detector, 18 ... Control panel, 21 ... motor, 21a ... casing, 22 ... rotating shaft, 23 ... pump, 24 ... check valve, 31 ... pump casing, 31a ... hole, 31b ... seal chamber, 31c ... seal groove, 32 ... mechanical seal 32a ... Lubricant, 32c ... Seal groove, 41 ... Fixed ring, 41a ... Sliding part, 41b ... Static seal part, 42 ... Rotating ring, 42a ... Seat part, 43 ... Biasing member, 51 ... Expiratory water tank, 52 ... Open / close valve, 53 ... Check valve, 61 ... Relief pipe, 62 ... Check valve, 63 ... Open / close valve, 71 ... Check valve, 81 ... Detection means, 81a ... Current sensor, 81b ... Rotation sensor, 82 ... Alarm means 83 ... Storage unit 84 ... Control 110, water discharge means, 111 ... sprinkler, 112 ... disposing pipe, 113 ... sprinkler head, 114 ... detector, C ... water supply source, D ... drainage section, F ... floor, K ... power cable, S ... signal line .

Claims (8)

A motor driven by the power of the rated current;
A rotating shaft connected to the motor;
A pump connected to the rotating shaft and having a pump casing;
A mechanical seal that seals between the rotary shaft and the pump casing;
Detecting means for detecting an abnormality of the motor due to adhesion of the mechanical seal;
Supplying the electric power to the motor and supplying the electric power to the motor, and detecting the abnormality of the motor by the detecting means, stopping supplying the electric power to the motor; A controller for supplying the electric power to the motor after a predetermined time;
Fire extinguishing pump unit comprising   The fire-extinguishing pump unit according to claim 1, wherein the control unit repeats supply and stop of the electric power to the motor until the rotation of the motor is detected. The detection means is a current sensor that detects a current value supplied to the motor,
A storage unit in which a current value at the time of abnormality of the motor due to adhesion of the mechanical seal is stored as a threshold;
When the control unit supplies the power to the motor, the current value detected by the current sensor is higher than a rated current for driving the motor, and is equal to or greater than the threshold value. The fire-extinguishing pump unit according to claim 1, wherein it is determined that the motor is abnormal. The detection means further includes a rotation sensor that detects the number of rotations of the rotation shaft,
The threshold value further includes the number of rotations when the motor is abnormal due to adhesion of the mechanical seal,
When the controller supplies the electric power to the motor, the current value detected by the current sensor is higher than a rated current for driving the motor and lower than the threshold value. The fire-extinguishing pump unit according to claim 3, wherein the motor is determined to be abnormal when the number of rotations detected by the rotation sensor is equal to or less than the threshold value. Connected to a rotating shaft provided with a mechanical seal between the pump and a motor that rotates at a rated current power, the controller supplies the power,
Detecting rotation and stop of the motor by detection means,
When the detection means detects the stop of the motor, the control unit stops supplying the electric power to the motor,
Supplying the electric power to the motor stopped by the control unit after a predetermined time has elapsed after stopping supplying the electric power to the motor;
Control method of fire pump unit.   The method of controlling a fire pump unit according to claim 5, wherein the control unit repeatedly supplies and stops the electric power to the motor until the rotation of the motor is detected. The detection means is a current sensor that detects a current value supplied to the motor,
When the controller supplies the electric power to the motor, the current value detected by the current sensor is higher than a rated current for driving the motor, and the mechanical seal is fixed. The control method of a fire pump unit according to claim 5, wherein when the current value at the time of abnormality of the motor is equal to or greater than the threshold value of the storage unit stored as a threshold value, it is determined that the motor is abnormal. The detection means further includes a rotation sensor that detects rotation of the rotation shaft,
In the storage unit, the rotational speed at the time of abnormality of the motor due to adhesion of the mechanical seal is further stored as the threshold value,
When the control unit supplies the electric power to the motor, the current value detected by the current sensor is higher than a rated current for driving the motor and lower than the threshold value. The method for controlling a fire pump unit according to claim 7, wherein when the number of rotations detected by the rotation sensor is equal to or less than the threshold value, it is determined that the motor is abnormal.