JP2012127360A - Pump installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump installation having improved reliability, safety and economic efficiency by shortening the time for stating a horizontal shaft pump to allow quick start of draining operation.SOLUTION: The pump installation 1 including the horizontal shaft pump 10 includes a vacuum pump 20 for performing water filling-up operation to fill up water in a casing 11 of the horizontal shaft pump 10 when starting the horizontal shaft pump 10, a water level detector 13 for detecting a water level in the casing of the horizontal shaft pump 10, and a control means for operating the horizontal shaft pump when the water level detector 13 detects that the water level in the casing of the horizontal shaft pump reaches a predetermined level of water before filled up when using the vacuum pump 20 for performing the water filling-up operation of the horizontal shaft pump.

Description

  The present invention relates to a pump facility provided with a plurality of horizontal axis pumps for installation in a drainage station for draining a river.

  Conventionally, there is a pump facility including a horizontal axis pump as described in Patent Document 1. This type of pump equipment is provided with a water-sealed vacuum pump for performing a water filling operation to fill the casing of the horizontal shaft pump with water when the horizontal shaft pump is started. In such a pump facility, when a plurality of horizontal shaft pumps are provided, two water-sealed vacuum pumps (one of which is one) are provided for all horizontal shaft pumps from the viewpoint of economy and the like. Is a spare machine).

Japanese Patent Laid-Open No. 11-31194

  In the pump equipment as described above, in order to start a plurality of horizontal axis pumps, the horizontal axis pumps were sequentially filled with one vacuum pump. For this reason, when the capacity of the horizontal axis pump is large (large diameter) or when the number of horizontal axis pumps is large, it takes a long time to start all the horizontal axis pumps. If it does so, the horizontal axis pump could not be started at an appropriate timing according to the rise of the internal water level, and in the worst case, there was a possibility of inundation damage such as river flooding.

  The time required for full water per horizontal axis pump is normally about 5 minutes. When there are many horizontal axis pumps, for example, when 6 pumps are installed, all horizontal axis pumps are drained. To start the operation, it takes 30 minutes or more, including the time required to start the operation of the auxiliary equipment of the horizontal axis pump. In order to prevent inundation damage due to heavy rain that has frequently occurred in recent years, it is necessary to shorten the time required for starting the horizontal axis pump as much as possible.

  The present invention has been made in view of the above points, and its purpose is to shorten the time required for starting the horizontal axis pump, so that drainage operation can be started quickly, and reliability and safety are improved. The purpose is to provide an economical pumping facility.

  In order to solve the above problems, the present invention is a pump facility having a horizontal axis pump, and includes a vacuum pump that performs a water filling operation to fill a casing of the horizontal axis pump with water when the horizontal axis pump is started, A water level detector that detects the water level in the casing of the horizontal axis pump is provided, and when the horizontal pump is filled with a vacuum pump, the water level in the casing of the horizontal axis pump is set to a predetermined level before full by the water level detector. Control means for operating the horizontal axis pump when it has been detected is provided.

  Conventionally, the horizontal axis pump is filled only with a vacuum pump, and the horizontal axis pump is not started during the full water operation. On the other hand, in the pump facility of the present invention, when performing a water filling operation with a vacuum pump, the horizontal axis pump is activated when the water level in the casing reaches a predetermined water level, and the discharge to the discharge side by rotation of the horizontal axis pump is performed. A full water operation was performed with exhaust action. As a result, the time required for the full water operation can be shortened compared to the full water operation using only the vacuum pump, and the operation of the horizontal axis pump (operation based on the rated drainage amount) can be started quickly. Therefore, inundation damage due to drainage delay can be prevented, and the pump facility is highly reliable. In addition, when the horizontal axis pump is started when there is no water in the casing (empty state), the impeller and the liner may seize up. However, in the pump equipment of the present invention, the water in the casing reaches a predetermined water level. Since the horizontal axis pump is activated after confirming that the water level has been detected, there is no risk of seizure, and the horizontal axis pump can be operated safely. The start of the pump may be a fully closed start of the discharge valve or a fully open or intermediate open start.

  Moreover, in the said pump installation, the water fall detector which detects the water fall of a horizontal axis pump is used as a water level detector.

  According to this configuration, since the falling water detector that has been installed in the horizontal axis pump is used as a water level detector for detecting the starting water level of the horizontal axis pump, it is not necessary to increase the number of parts of the pump equipment. Equipment can be configured at low cost. The water level in the casing may be detected by a pressure detector provided in the casing or the suction / discharge pipe.

  Further, in the above pump equipment, the pump equipment having a horizontal axis pump, wherein when the horizontal axis pump is started, the water filling operation for filling the casing of the horizontal axis pump with water is performed by a water ring vacuum pump. The drain pipe for draining the internal water in the vacuum pump and the drain valve installed in the drain pipe, the drain valve is opened before the water ring vacuum pump is started, and the water seal vacuum pump is drained. The vacuum pump is started.

  A water-sealed vacuum pump such as a Nash type vacuum pump has a large starting torque when water is present inside, and sometimes exceeds the starting torque of the electric motor and cannot be started. Since the water-sealed vacuum pump has a characteristic that the starting torque decreases when the amount of internal water is reduced, if the amount of internal water is reduced only at the start and the start by the electric motor is completed, the amount of internal water is returned to the steady amount. The water-sealed vacuum pump can be reliably started without increasing the rated capacity of the electric motor. Further, according to this, since a star delta start or the like that suppresses the current required for starting the electric motor can be adopted without difficulty, it is possible to simplify and reduce the cost of the starter. As a result, it is possible to construct a pump facility with excellent economic efficiency.

  Moreover, in the said pump installation, it is good to start up drain piping to the arbitrary water level at the time of starting of a water ring vacuum pump.

  With this configuration, the water level at the start of the water ring vacuum pump can be set to an arbitrary water level, and the vacuum pump is reliably prevented from operating below the lower limit water level (so-called empty state). it can. Thereby, failure due to seizure of the sliding portion of the water-sealed vacuum pump can be effectively prevented, and a highly reliable pump facility can be constructed.

  In the above pump facility, the motor includes a motor that drives the water ring vacuum pump and an inverter device that supplies driving power to the motor, and a driving power frequency that is supplied from the inverter device to the motor when the water ring vacuum pump is operated. Is controlled to be equal to or higher than the rated (commercial power supply frequency) frequency so that the current value becomes the rated current value of the electric motor.

  According to this configuration, it is possible to make maximum use of the ability of the electric motor that drives the water ring vacuum pump. As a result, the intake performance of the water-sealed vacuum pump can be maximized, and the time required for full operation of the horizontal shaft pump can be further shortened.

  In the above pump facility, a pressure measuring device for measuring the pressure in the casing of the horizontal axis pump and a frequency setting device for setting the drive power frequency output from the inverter device are provided, and the frequency setting device is provided by the pressure measuring device. Based on the measured pressure, the drive power frequency is set so that the current value becomes the rated current value of the motor.

  According to this configuration, it is possible to easily and surely control the rotation speed of the motor so that the current value is the rated current value of the motor, and to make maximum use of the capacity of the motor that drives the water ring vacuum pump. Can be easily done.

  According to the pump equipment of the present invention, the drainage operation can be started quickly by shortening the time required for starting the horizontal axis pump, and the reliability, safety and economy of the pump equipment can be improved.

It is a flowchart which shows the structural example of the pump installation concerning 1st Embodiment of this invention. It is the schematic which shows the structural example of a horizontal-axis pump. It is a flowchart which shows the operation | movement procedure of the horizontal axis pump by pump installation. It is the schematic which shows the structural example of the horizontal axis pump with which the pump installation concerning 2nd Embodiment of this invention is provided. It is a flowchart which shows the starting procedure of the horizontal axis pump in the pump installation of 2nd Embodiment. It is the schematic which shows the structural example of the horizontal axis pump with which the pump installation concerning 3rd Embodiment of this invention is provided. It is a flowchart which shows the starting procedure of the vacuum pump in the pump installation of 3rd Embodiment. It is a graph which shows an example of the starting torque characteristic of a water ring type vacuum pump. It is the schematic which shows the structural example of the casing of a vacuum pump, and the drain piping connected to this casing. It is the schematic which shows the structural example of the horizontal axis pump with which the pump installation concerning 4th Embodiment of this invention is provided. It is a graph which shows an example of the setting data in a frequency setting device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
FIG. 1 is a flowchart showing a configuration example of the pump equipment according to the first embodiment of the present invention. The pump facility 1 shown in the figure includes a plurality of (four in the figure) horizontal shaft pumps (main pumps) 10. A plurality of water-sealed vacuum pumps (hereinafter simply referred to as “vacuum pumps”) 20 for performing a water filling operation for filling the casing of the horizontal shaft pump 10 with water when the horizontal shaft pump 10 is started. (2 in the figure). In the following, the four horizontal axis pumps 10 having the same configuration shown in FIG. 1 are respectively referred to as the first horizontal axis pump 10-1, the second horizontal axis pump 10-2, the third horizontal axis pump 10-3, and the fourth. The horizontal axis pump 10-4 and the two vacuum pumps 20 having the same configuration are called a first vacuum pump 20-1 and a second vacuum pump 20-2, respectively.

  FIG. 2 is a schematic diagram illustrating a configuration example of the horizontal axis pump 10. The horizontal axis pump 10 includes a suction port 10b that opens to the suction water tank 2 and a discharge port 10c that opens to the discharge water tank 3, and the flow path between the suction port 10b and the discharge port 10c is horizontal (horizontal direction). A casing 11 is provided. And in the casing 11, the pump shaft 10a arrange | positioned in the horizontal direction in the axial direction and the impeller (impeller) (not shown) attached to this pump shaft 10a are installed. Further, a drive machine 4 for driving the horizontal shaft pump 10 and a speed reducer 5 connected to the drive shaft 4 a of the drive machine 4 are provided. A pump shaft 10 a of a horizontal shaft pump 10 is connected to the speed reducer 5. As the drive machine 4, an electric motor, a diesel engine, or the like is used. By driving the drive unit 4, the pump shaft 10 a rotates via the speed reducer 5, and the water in the suction water tank 2 is pumped up by the horizontal shaft pump 10 and discharged into the discharge water tank 3. .

  An intake line (intake pipe) 30 is connected to the casing 11 of the horizontal axis pump 10. The intake line 30 is provided with a full water detector 12 for detecting the full water in the casing 11 and an intake valve (electrically operated valve or electromagnetic valve) 31 for opening and closing the intake line 30. As shown in FIG. 1, here, intake lines 30-1 to 30-4 corresponding to the first to fourth horizontal shaft pumps 10-1 to 10-4 are provided, and the intake lines 30-1 to 30-30 are provided. -4 are provided with full-water detectors 12-1 to 12-4 and intake valves 31-1 to 31-4, respectively. The intake lines 30-1 to 30-4 merge with each other on the downstream side of the intake valves 31-1 to 31-4. The merged intake line 30 communicates with the suction side of the first vacuum pump 20-1 and the second vacuum pump 20-2 via intake pipes 33-1 and 33-2 described later.

  The first and second vacuum pumps 20-1 and 20-2 are provided with electric motors 21-1 and 21-2 for driving the first and second vacuum pumps 20-1 and 20-2, respectively. Further, water supply pipes 22-1 and 22-2 for supplying makeup water are connected to the intake sides of the first and second vacuum pumps 20-1 and 20-2, respectively, and the supplied water is discharged to the exhaust side. The drain pipes 23-1 and 23-2 to be connected are connected. Water supply pumps 24-1 and 24-2 are attached to the suction ends of the water supply pipes 22-1 and 22-2. The water supply pumps 24-1 and 24-2 are installed by immersing in makeup water in the refill tank 25. In addition, water supply valves (electric valves or electromagnetic valves) 28-1 and 28-2 are installed at positions immediately before the first and second vacuum pumps 20-1 and 20-2 in the water supply pipes 22-1 and 22-2. Has been. On the other hand, the drain pipes 23-1 and 23-2 are connected to a gas-liquid separation tank (separator) 26, and a drain pipe 27 is connected to the downstream side of the gas-liquid separation tank 26. The drain pipe 27 has a downstream end (discharge port) opened to the water replenishing tank 25. Thereby, the water supplied from the supplementary water tank 25 by the water supply pumps 24-1 and 24-2 is introduced into the first and second vacuum pumps 20-1 and 20-2, respectively, and the first and second vacuum pumps. The water including the exhaust gas discharged from 20-1 and 20-2 is separated from the gas in the gas-liquid separation tank 26, and returned to the supplementary water tank 25.

  The intake line 30 is provided with a switching valve (electric valve or electromagnetic valve) 32 that divides the intake line 30 into a plurality of systems. In the present embodiment, by closing the switching valve 32, the intake line 30 is connected to the A system to which the first horizontal axis pump 10-1 and the second horizontal axis pump 10-2 belong, the third horizontal axis pump 10-3, The fourth horizontal axis pump 10-4 is divided into two systems, that is, the B system to which the fourth horizontal axis pump 10-4 belongs. The A system is connected to an intake pipe 33-1 that communicates with the intake side of the first vacuum pump 20-1, and the B system is connected to an intake pipe 33 that communicates with the intake side of the second vacuum pump 20-2. -2 is connected.

  In addition, although not shown in the drawing, the pump equipment 1 operates and stops the first and second vacuum pumps 20-1 and 20-2, and each valve such as the intake valve 31, the switching valve 32, the water supply valve 28, and the like A control panel for controlling the opening and closing of the door is installed. A detection signal of the full water detector 12 and the like are also input to the control panel.

  FIG. 3 is a flowchart showing an operation procedure when the horizontal axis pump 10 is started in the pump facility 1. As shown in the figure, the operation modes of the first and second vacuum pumps 20-1 and 20-2 can be switched to three modes of a normal mode, a single-machine emergency mode, and a parallel emergency mode by operation of the control panel. It has become.

  The normal mode is an operation mode in which the water-filling operation of the horizontal axis pump 10 is sequentially performed one by one using only one vacuum pump 20 as in the prior art. In this normal mode, first, an operation command for one of the four horizontal axis pumps 10 (here, the first horizontal axis pump 10-1 will be described as an example) is issued (step ST1-1). Thereafter, the switching valve 32 is opened (step ST1-2). Then, the intake valve (first intake valve) 31-1 corresponding to the first horizontal axis pump 10-1 is opened (step ST1-3). At this time, the intake valves 31-2 to 31-4 corresponding to the other horizontal axis pumps 10-2 to 10-4 are closed. Subsequently, the operation of the water supply pump (first water supply pump) 24-1 connected to any one of the vacuum pumps 20 (here, the first vacuum pump 20-1 will be described as an example) is started (Step S1). ST1-4). Thereby, the water in the replenishing tank 25 is supplied to the first vacuum pump 20-1 by the water supply pump 24-1, and the first vacuum pump 20-1 is operated. By operating the first vacuum pump 20-1, the air in the casing 11 of the first horizontal axis pump 10-1 is sucked through the intake line 30, and the water in the suction water tank 2 is introduced into the casing 11. Is done. When full water in the casing 11 is detected by the full water detector 12-1, the control panel closes the intake valve, stops the operation of the first vacuum pump 20-1, and ends the full water operation. Thereby, it will be in the state with which the casing 11 of the 1st horizontal shaft pump 10-1 was filled with water. Thereafter, the first horizontal shaft pump 10-1 is started to start the drainage operation.

  The single-machine emergency mode is an operation mode in which two vacuum pumps 20 are operated simultaneously to perform a full operation of one horizontal shaft pump 10. In this single-machine emergency mode, first, an operation command for one of the four horizontal axis pumps 10 (here, the first horizontal axis pump 10-1 will be described as an example) is issued (step ST2-1). Thereafter, the switching valve 32 is opened (step ST2-2). Then, the intake valve 31-1 corresponding to the first horizontal shaft pump 10-1 is opened (step ST2-3). At this time, the intake valves 31-2 to 31-4 corresponding to the other horizontal axis pumps 10-2 to 10-4 are closed. Subsequently, the operation of both the water supply pump 24-1 and the water supply pump 24-2 connected to the first vacuum pump 20-1 and the second vacuum pump 20-2 is started (step ST2-4). As a result, the water in the replenishing tank 25 is supplied to the first vacuum pump 20-1 and the second vacuum pump 20-2 by the water supply pumps 24-1 and 24-2, and the first vacuum pump 20-1 and the second vacuum pump 20-2 are supplied. The vacuum pump 20-2 is operated simultaneously. By operating the first vacuum pump 20-1 and the second vacuum pump 20-2, the air in the casing 11 of the first horizontal shaft pump 10-1 is sucked through the intake line 30, and the casing 11 The water of the suction tank 2 is introduced into the inside. When full water in the casing 11 is detected by the full water detector 12, the control panel closes the intake valve, stops the operation of the first and second vacuum pumps 20-1 and 20-2, and ends the full water operation. . Thereby, it will be in the state with which the casing 11 of the 1st horizontal shaft pump 10-1 was filled with water. Thereafter, the first horizontal shaft pump 10-1 is started to start the drainage operation.

  According to this single-machine emergency mode, when the water filling operation of one horizontal axis pump 10 is performed, the start time of the horizontal axis pump 10 can be shortened by operating two vacuum pumps 20 simultaneously. Thereby, since the drainage operation by the horizontal shaft pump 10 can be started quickly and the flood damage due to the drainage delay can be prevented, a highly reliable pump facility can be constructed. In particular, when the capacity of the horizontal axis pump 10 is large (in the case of a large diameter), the effect of shortening the starting time of the horizontal axis pump 10 is increased. In this single-machine emergency mode, the water filling operation of one horizontal shaft pump 10 is performed by two vacuum pumps 20, but in addition to this, the water filling operation of two or more horizontal shaft pumps 10 is performed simultaneously. In some cases, two or more vacuum pumps 20 can be operated simultaneously.

  The parallel emergency mode is an operation mode in which when the horizontal axis pump 10 is started, the full operation of the next operation unit is performed in parallel with the full operation of the first operation unit, thereby simultaneously performing the full operation of the plurality of horizontal axis pumps 10. is there. In this parallel emergency mode, first, an operation command is issued for any one of the horizontal axis pumps 10 belonging to the A system (here, the first horizontal axis pump 10-1 will be described as an example) (step ST3-1). Thereafter, the switching valve 32 is closed (step ST3-2). Then, the intake valve 31-1 corresponding to the first horizontal axis pump 10-1 is opened (step ST3-3). At this time, the intake valve 31-2 corresponding to the other horizontal axis pump 10-2 of the A system is closed. Subsequently, the operation of the feed water pump 24-1 of the first vacuum pump 20-1 corresponding to the A system is started (step ST3-4). Thereby, the water in the replenishing tank 25 is supplied to the first vacuum pump 20-1 by the water supply pump 24-1, and the first vacuum pump 20-1 is operated. By operating the first vacuum pump 20-1, the air in the casing 11 of the first horizontal shaft pump 10-1 is sucked through the A system of the intake line 30, and the suction water tank 2 Water is introduced. When full water in the casing 11 is detected by the full water detector 12-1, the intake valve is closed, the operation of the first vacuum pump 20-1 is stopped, and the full water operation is terminated. Thereby, it will be in the state with which the casing 11 of the 1st horizontal shaft pump 10-1 was filled with water. Thereafter, the first horizontal shaft pump 10-1 is started to start the drainage operation.

  While the first horizontal shaft pump 10-1 belonging to the A system is full, the horizontal pump 10 belonging to the B system in parallel (here, the third horizontal pump 10-3). Is used as an example). The procedure will be described below. First, after issuing an operation command for the first horizontal axis pump 10-1 in the previous step ST3-1, an operation preparation command for the third horizontal axis pump 10-3 is then issued (step ST3-6). Then, the intake valve 31-3 corresponding to the third horizontal axis pump 10-3 is opened (step ST3-7). At this time, the intake valve 31-4 corresponding to the other fourth horizontal axis pump 10-4 of the B system is closed. Subsequently, the operation of the feed water pump 24-2 of the second vacuum pump 20-2 corresponding to the B system is started (step ST3-8). Thereby, the water in the replenishing tank 25 is supplied to the second vacuum pump 20-2 by the water supply pump 24-2, and the second vacuum pump 20-2 is operated. By operating the second vacuum pump 20-2, the air in the casing 11 of the third horizontal axis pump 10-3 is sucked through the A system of the intake line 30, and the suction water tank 2 is put into the casing 11. Water is introduced. When full water in the casing 11 is detected by the full water detector 12-3, the control panel closes the intake valve, stops the operation of the second vacuum pump 20-2, and ends the full water operation. Thereby, it will be in the state with which the inside of the casing 11 of the 3rd horizontal shaft pump 10-3 was filled with water. Thereafter, the third horizontal shaft pump 10-3 is started to start the drainage operation.

  According to this parallel emergency mode, when the water filling operation of a plurality of horizontal axis pumps 10 is performed, the switching line 32 divides the intake line 30 into a plurality of systems, and the horizontal axis pumps 10 belonging to each system are paralleled one by one. And can fill up. Thereby, the full water operation of the next horizontal shaft pump 10 can be started without waiting for the completion of the full water operation of one horizontal shaft pump 10. Therefore, even when the river level suddenly rises due to a heavy rain, a plurality of horizontal axis pumps 10 can be started quickly, and flooding damage due to river flooding can be prevented.

  The water-sealed vacuum pump 20 has a large noise during operation due to its structure. Therefore, if there is no risk of a sudden rise in the river water level due to sudden heavy rain, etc., in consideration of the surrounding environment, etc., it is operated in the normal mode in which the horizontal axis pumps 10 are sequentially started one by one by one vacuum pump 20. I do. Then, the above two types of emergency operation modes are provided on the operation panel, and the simultaneous operation of two vacuum pumps 20 is performed as an emergency treatment based on the judgment of the operator. By doing so, it becomes possible to quickly respond to changes in conditions such as the weather, so that stable drainage operation can be performed, and it is possible to construct a pump facility that is environmentally friendly and has excellent drainage reliability.

  Further, in order to operate the water ring vacuum pump 20 provided in the pump facility 1 of the present embodiment, makeup water is required. In particular, when two water-sealed vacuum pumps 20 are operated simultaneously, a corresponding amount of makeup water is required, and the capacity of the supplementary water tank 25 is likely to be insufficient. In order to cope with this, the replenishing tank 25 is enlarged and installed at a high position (the flow rate increases, so it is necessary to ensure a height difference to overcome piping loss), or piping through which makeup water circulates It is conceivable to take measures such as increasing the diameter, but if these measures are taken, the facility becomes large, resulting in a problem in economy.

  In this regard, in the pump facility 1 of the present embodiment, the feed water pump 24 that is normally used as a pump for pumping water to the replenishment tank 25 is directly connected to the vacuum pump 20, so that the feed pump 24 operates the vacuum pump 20. The amount of makeup water and the water pressure required at times are ensured. Furthermore, if the water supply pump 24 is configured to supply water directly from a water source such as a well, the water reserving tank 25 can be omitted. Therefore, it is possible to construct a pump facility that is excellent in reliability and economy.

  Further, the makeup water is discharged to the outside of the vacuum pump 20 together with the exhaust gas as the vacuum pump 20 is operated. At that time, if the discharged makeup water is discharged into the suction water tank 2 of the horizontal axis pump 10 or a side groove (not shown) as in the conventional case, it is necessary to replenish the same amount of water as the amount discharged. In this case, if the capacity of the vacuum pump 20 is large, the amount of water to be replenished increases and it becomes difficult to secure the replenishing water. In the case of the pump facility 1 according to the present embodiment, a plurality of vacuum pumps 20 may be operated at the same time. Therefore, if the conventional method is used, the amount of water to be replenished is further increased.

  In this regard, in the pump facility 1 of the present embodiment, a gas-liquid separation tank 26 is provided on the exhaust side (replenishment water discharge side) of the vacuum pump 20, and the liquid component from which gas has been removed by the gas-liquid separation tank 26 Returning to 25, a makeup water circulation system is constructed. With this configuration, the amount of water to be replenished in the replenishing water circulation system is very small or no replenishing water is required, so that the operation of the pump facility 1 can be simplified. The economical efficiency and reliability of the facility 1 can be improved.

[Second Embodiment]
Next, the pump installation concerning 2nd Embodiment of this invention is demonstrated. In the description of the second embodiment and the corresponding drawings, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted below. In addition, matters other than those described below are the same as those in the first embodiment. The same applies to other embodiments.

  FIG. 4 is a schematic diagram illustrating a configuration example of the horizontal axis pump 10 provided in the pump facility 1-2 according to the second embodiment of the present invention. In this embodiment, the water fall detector 13 for detecting the water fall of the horizontal axis pump 10 is provided. And this water fall detector 13 is used to detect the water level in the casing 11 when the horizontal axis pump 10 is fully filled.

  FIG. 5 is a flowchart for explaining the starting procedure of the horizontal axis pump 10 in the pump equipment 1-2 of the present embodiment. Here, first, an operation command for one of the four horizontal axis pumps 10 (here, the first horizontal axis pump 10-1 will be described as an example) is issued (step ST11). Thereafter, the intake valve 31-1 corresponding to the first horizontal axis pump 10-1 is opened (step ST12). At this time, the intake valves 31-2 to 31-4 corresponding to the other horizontal axis pumps 10-2 to 10-4 are closed. Subsequently, the operation of the water supply pump 24-1 connected to any one of the vacuum pumps 20 (here, the first vacuum pump 20-1 will be described as an example) is started. Thereby, the water of the supplementary water tank 25 is supplied to the 1st vacuum pump 20-1 with the water supply pump 24-1, and the 1st vacuum pump 20-1 is drive | operated (step ST13). By operating the first vacuum pump 20-1, the air in the casing 11 of the first horizontal axis pump 10-1 is sucked through the intake line 30, and the water in the suction water tank 2 is introduced into the casing 11. Is done. Thereafter, it is determined whether or not the water in the casing 11 has reached a predetermined water level (step ST14). When the water level has reached a predetermined water level, the drive unit 4 of the first horizontal axis pump 10-1 is activated and the first horizontal axis The operation of the pump 10-1 is started (step ST15). Here, it is determined that the water in the casing 11 has reached the predetermined water level by not detecting the water fall by the water fall detector 13 (no water fall detected). Thereafter, the water in the suction tank 2 is further introduced, and it is determined whether or not the full water detector 12 detects full water (step ST16). If full water is detected, the intake valve 31-1 is closed (step ST17). Then, the first vacuum pump 20-1 is stopped (step ST18), and the water filling operation is terminated.

  Conventionally, the horizontal axis pump is filled with a vacuum only by a vacuum pump, and the horizontal axis pump is not started during the full operation. On the other hand, in the pump facility 1-2 according to the present embodiment, the water level in the casing 11 reaches the predetermined water level in the falling water detector 13 when the vacuum pump 20 performs the full water operation of the horizontal axis pump 10. When this is detected, the horizontal axis pump 10 is started, and a full water operation is performed together with the exhaust operation to the discharge side by the rotation of the horizontal axis pump 10. Thereby, compared with the full water operation only with the vacuum pump 20, the time required for the full water can be shortened, and the operation of the horizontal axis pump 10 (the operation with the rated drainage amount) can be started quickly. Therefore, inundation damage due to drainage delay can be effectively prevented, and the pump facility has high reliability and safety.

  In addition, when the horizontal axis pump 10 is activated in a state where there is no water in the casing 11 (empty state), the impeller and the liner may be seized in the casing 11, but in the pump equipment 1-2 of the present embodiment, Since the horizontal axis pump 10 is started after the water drop detector 13 confirms that the water in the casing 11 has reached the predetermined water level, there is no possibility that such seizure will occur, and the horizontal axis pump 10 is safe. It becomes possible to drive to.

  Moreover, in the pump installation 1-2 of this embodiment, the water fall detector 13 which detects the water fall of the horizontal axis pump 10 is used as a water level detector for detecting the starting water level of the horizontal axis pump 10. Thus, by using the water fall detector 13 installed in the horizontal axis pump 10 as a water level detector in the past, it is not necessary to increase the number of parts of the pump equipment 1-2, and the pump equipment 1-2 is inexpensive. Can be configured.

[Third Embodiment]
Next, the pump installation concerning 3rd Embodiment of this invention is demonstrated. FIG. 6 is a schematic diagram illustrating a configuration example of the horizontal shaft pump 10 included in the pump equipment 1-3 according to the third embodiment of the present invention. In the present embodiment, a drain pipe 41 for draining the inside of the casing 29 of the vacuum pump 20 and a ren valve 42 including an electric valve or an electromagnetic valve are attached to the vacuum pump 20.

  FIG. 7 is a graph showing an example of the starting torque characteristic of the vacuum pump 20. As shown in the figure, when water is accumulated in the casing 29 of the vacuum pump 20, that is, when there is water in the casing 29, the starting torque of the vacuum pump 20 increases. In this case, the vacuum pump 20 cannot be started in a range where the starting torque is equal to or higher than the starting torque of the electric motor 21 as indicated by the alternate long and short dash line in FIG. In order to cope with this problem, in the pump equipment 1-3 of the present embodiment, the water in the casing 29 is temporarily drained by opening the drain valve 42 when the vacuum pump 20 is started, thereby reducing the amount of water in the casing 29. When the start by the electric motor 21 is completed, the water amount in the casing 29 is returned to the steady amount. By doing so, the starting torque of the vacuum pump 20 can be reduced.

  FIG. 8 is a flowchart for explaining the starting procedure of the vacuum pump 20 in the pump facility 1-3 of the present embodiment. First, the control panel issues an operation command for the vacuum pump 20 (step ST21). Thereafter, the drain valve 42 of the vacuum pump 20 is opened, and the water accumulated in the vacuum pump 20 is drained (step ST22). While the predetermined timer time (T) elapses, the water accumulated in the vacuum pump 20 continues to be drained (step ST23). When the timer time (T) elapses, drainage is terminated and the vacuum pump 20 is started (step ST24). Then, after a predetermined timer time (T) has elapsed (step ST25), the water supply valve 28 installed in the water supply pipe 22 is opened (step ST26). Further, the passage of a predetermined timer time (T) is waited (step ST27), and the drain valve 42 is closed (step ST28).

  If the vacuum pump 20 is started according to the above procedure, the vacuum pump 20 can be reliably started without increasing the rated capacity of the electric motor 21. In addition, since a star delta start or the like that suppresses the current required for starting the electric motor 21 can be employed without difficulty, the starter can be simplified and reduced in cost. As a result, it is possible to construct a pump facility with excellent economic efficiency.

  FIG. 9 is a schematic diagram for explaining a configuration example of the casing 29 of the vacuum pump 20 and the drain pipe 41 connected to the casing 29. In the present embodiment, the predetermined portion 41 a in the middle of the drain pipe 41 is raised to the lower limit water level when the vacuum pump 20 is started. Reference numeral 43 denotes an air valve (air vent valve) installed in the midway portion 41a. By doing so, the water level in the casing 29 at the start of the vacuum pump 20 can be maintained above the lower limit water level, and the vacuum pump 20 can be reliably prevented from operating below the lower limit water level (so-called empty state). Therefore, failure due to seizure of the sliding portion of the vacuum pump 20 can be effectively prevented, and highly reliable pump equipment can be constructed.

[Fourth Embodiment]
Next, the pump installation concerning 4th Embodiment of this invention is demonstrated. FIG. 10 is a schematic diagram illustrating a configuration example of the horizontal shaft pump 10 included in the pump equipment 1-4 according to the fourth embodiment of the present invention. In this embodiment, the inverter apparatus 40 for controlling the rotation speed of the electric motor 21 is provided. Further, a pressure measuring device (coupler or vacuum gauge) 14 for measuring the pressure in the casing 11 of the horizontal axis pump 10, and the electric motor from the inverter device 40 based on the measured value of the pressure in the casing 11 by the pressure measuring device 14. And a frequency setting unit 15 for setting the frequency of the driving power supplied to the control unit 21. FIG. 11 is a graph showing an example of setting data in the frequency setting unit 15. As shown in the figure, in the frequency setting device 15, the frequency of the driving power output from the inverter device 40 to the electric motor 21 with respect to the pressure (degree of vacuum in the casing 11) measured by the pressure measuring device 14 is set. The data to be stored is stored.

  In the pump facility 1-4, the frequency of the driving power output from the inverter device 40 to the electric motor 21 is set based on the pressure value (degree of vacuum) measured in the casing 11 by the pressure measuring device 14. Thus, the rotational speed is controlled so that the current value of the electric motor 21 during operation of the vacuum pump 20 is maintained at the rated current value of the electric motor 21, and the ability of the electric motor 21 that drives the vacuum pump 20 is utilized to the maximum. Is possible. Therefore, the suction capacity of the vacuum pump 20 can be maximized, and the time required for the horizontal axis pump 10 to fill up can be further shortened.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. It should be noted that any shape, structure, and material not directly described in the specification and drawings are within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, in each said embodiment, although the number of the horizontal axis pumps 10 with which a pump installation is provided was four, the number of the horizontal axis pumps 10 with which a pump installation is provided may be other than this. Although the number of vacuum pumps 20 is two, it is also possible to provide three or more.

  The present invention includes a vacuum pump that performs a full water operation for filling the casing of the horizontal shaft pump with water when starting the horizontal shaft pump, and a water level detector that detects the water level in the casing of the horizontal shaft pump. When the horizontal pump is filled with a vacuum pump, if the water level detector detects that the water level in the casing of the horizontal pump has reached the specified water level before full, a control means is provided to operate the horizontal pump. By constructing the pump equipment, when performing a water filling operation with a vacuum pump, the horizontal axis pump is started when the water level in the casing reaches a predetermined water level, and the exhaust action to the discharge side by the rotation of the horizontal axis pump is performed. Perform full water operation in combination. This makes it possible to shorten the time required for the full water operation compared to the full water operation using only the vacuum pump, to quickly start the operation of the horizontal axis pump (operation based on the rated drainage amount), and to prevent inundation damage due to drainage delay. It can be used as a highly reliable pump facility.

DESCRIPTION OF SYMBOLS 1 Pump equipment 2 Suction water tank 3 Discharge water tank 4 Drive machine 5 Reduction gear 10 Horizontal shaft pump 11 Casing 12 Full water detector 13 Fall detector (water level detector)
14 Pressure measuring device 15 Frequency setting device 20 Vacuum pump 21 Electric motor 22 Water supply pipe 23 Drain pipe 24 Water supply pump 25 Water replenishment tank 26 Gas-liquid separation tank (separator)
27 Drain pipe 28 Water supply valve 29 Casing 30 Intake line 31 Intake valve 32 Switching valve 33 Intake pipe 40 Inverter device 41 Drain pipe 42 Drain valve 43 Air valve

Claims (6)

A pump facility having a horizontal axis pump,
A vacuum pump for performing a full water operation to fill the inside of the casing of the horizontal axis pump with water when starting the horizontal axis pump;
A water level detector for detecting the water level in the casing of the horizontal axis pump is provided,
When performing a full water operation of the horizontal pump with the vacuum pump, if the water level detector detects that the water level in the casing of the horizontal shaft has reached a predetermined water level before full, the horizontal pump is operated. Pump equipment characterized by providing control means for In the pump installation according to claim 1,
As the water level detector, a water fall detector for detecting water fall of the horizontal axis pump is used. A pump facility having a horizontal axis pump, wherein when the horizontal axis pump is started, a water-filled vacuum pump is used to fill the casing of the horizontal axis pump with water.
A drain pipe for draining the internal water in the water-sealed vacuum pump, and a drain valve installed in the drain pipe,
A pump facility characterized in that the drain valve is opened before the water ring vacuum pump is started to drain the water ring vacuum pump. In the pump installation according to claim 3,
A pump facility characterized in that the drain pipe is raised to an arbitrary starting lower limit water level position of the water ring vacuum pump. The pump equipment according to any one of claims 1 to 4,
An electric motor that drives the water-sealed vacuum pump, and an inverter device that supplies driving electric power to the electric motor,
A pump facility characterized in that the drive power frequency supplied to the electric motor from the inverter device during operation of the water ring vacuum pump is controlled to be equal to or higher than the rated frequency so that the current value becomes the rated current value of the electric motor. In the pump installation according to claim 5,
A pressure measuring device for measuring the pressure in the casing of the horizontal axis pump;
A frequency setter for setting the drive power frequency output from the inverter device;
The frequency setting device sets the driving power frequency based on the pressure measured by the pressure measuring device so that the current value becomes a rated current value of the electric motor.

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