JP2019206838A - Pump system - Google Patents

Abstract

To provide a pump system in which odor generation is reduced by reducing the amount of sewage accumulated in a sewage tank.SOLUTION: A pump system 10, 10a, 10b, 10c, or 10d has at least one submerged motor pump P that is installed in a drainage tank 20 for discharging fluid from the drainage tank 20. In the pump system 10, 10a, 10b, 10c, or 10d, every submerged motor pump P in the drainage tank 20 includes a cooling mechanism to control the saturation temperature on the submerged motor pump P to be an abnormal temperature or lower. The drainage tank 20 is a sewage pit. However, the motor pump P may be installed in a panel tank or barrel in addition to the sewage pit. The drainage tank 20 is installed below a basement part B.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pump system.

  Pumps include submersible motor pumps and land pumps. The submersible motor pump is a pump that can be operated in a liquid such as water. Submersible motor pumps include sewage treatment submersible motor pumps installed inside or outside a sewage tank. The submersible motor pump disposed outside the sewage tank is called a tank-shaped sewage pump. The tank-shaped sewage pump includes a tank-shaped sewage pump disposed in a dry pit. Here, the dry pit is a pit that is waterproof so that it is safe even if sewage overflows.

  There is also a building pit as a kind of sewage pit. The building pit is a drainage tank installed in the basement of the building and installed at a position lower than the public sewer. Sewage discharged from the building flows down into the building pit under natural flow. The sewage pump pumps the sewage flowing down into the building pit to the public sewer.

  In such a drainage facility using a building pit, the pump starts operation when the level of the sewage that has flowed down reaches a predetermined level. However, if the sewage level does not reach a predetermined level and sewage or the like remains in the building pit for a long time, there is a risk that decay will occur and odors may leak from the basement of the building.

  The above problem is conspicuous because the amount of residual sewage and the like increases. In order to improve this, a malodor prevention type drainage system has been proposed in which a cylindrical water tank (barrel) or the like is installed in a building pit and a pump is arranged in the barrel (for example, Patent Document 1).

  In Patent Document 1, by installing a barrel in the underground pit of the building and reducing the residual amount of sewage and miscellaneous drainage as much as possible at the end of the drainage operation of the pump, the sewage is prevented from decaying and the generation of malodors Prevented malodor prevention drainage is disclosed.

Japanese Patent No. 4455742

  The submersible motor pump in the tank usually needs to be continuously operated while cooling the electric motor with the sewage in the tank. As shown in FIG. 6 of Patent Document 1, the activation water level (WL1) at which the pump is activated is higher than the water level at which the entire pump is submerged. The stop water level (WL2) at which the pump stops is a water level at which the motor unit is not exposed. In the submersible motor pump in the tank, when the electric motor is exposed in the air, in order to avoid a failure due to the heat generation of the electric motor, for example, it is stopped for about 30 minutes and the pump is started again. A time interval is required for cooling the electric motor by stopping the period (for example, a time equivalent to the time during which the air exposure operation is performed).

The reason for this is that, in the “submersible motor pump for equipment drainage JISB8325”, the minimum requirement for the submersible motor pump for equipment drainage is that “the pump with the motor exposed on the water surface is exposed to the atmosphere during operation. It shall be possible to operate without any problem for 30 minutes from the beginning, but the stop time from stopping to restarting is longer than the operating time from starting exposure until stopping. " It is because it has been.

  Therefore, when the conventional submersible motor pump is continuously operated, the electric motor needs to be operated in a submerged state, so that the pump cannot be operated at an arbitrary timing. As a result, if the water level of the sewage is lower than the water level at which the electric motor is submerged, the submersible motor pump cannot be continuously operated and discharged. As described above, in the drainage equipment using the conventional submersible motor pump, if the sewage in the sewage tank stays for a long time with the electric motor exposed on the surface of the water, a bad odor may be generated.

  One aspect of the present invention was made to solve such problems, and its purpose is to provide a pump system that reduces the amount of sewage accumulated in the sewage tank and reduces the generation of malodors. It is to be.

  In order to solve the above-described problem, in the first embodiment, a pump system having at least one submersible motor pump installed in the liquid tank in order to discharge the liquid from a liquid tank capable of containing the liquid. And the said pump system has a cooling mechanism in which all the said submersible motor pumps installed in the said liquid tank hold down the temperature of the said submersible motor pump below predetermined temperature at the time of continuous operation in gas. The structure of the pump system characterized by this is adopted.

  In this embodiment, a submersible motor pump capable of continuous operation in a gas (hereinafter referred to as “in the air”) is disposed in a liquid tank such as a sewage tank. A submersible motor pump capable of continuous operation in the air has a cooling mechanism that suppresses the temperature to a predetermined temperature or lower during continuous operation in gas, so that the pump can be started even if the motor unit is not submerged. As compared with the above, the pump can be started at an arbitrary timing. As a result, when activation becomes necessary, drainage can be started more quickly than in the prior art. Odor due to long-term sewage stay in the sewage tank can be effectively prevented.

Moreover, according to this embodiment, there exists an effect demonstrated below. Conventionally, a submersible motor pump capable of continuous operation in the air has been used as a tank outer shape pump. The purpose of using the submersible motor pump capable of continuous operation in the air as the tank outer shape pump is as described above, but this conventional technique has the following problems.
・ When removing the pump suction port from the pipe connected to the suction water tank during maintenance of the tank outer shape pump, the removed part of the pipe is outside the suction water tank, so the surroundings may be contaminated with the liquid in the pipe.
-It is necessary to provide piping for the pump outside the suction water tank, and it is necessary to connect the suction pipe. If it is used in an existing building, the water shut-off time during installation work will be longer.
-Water tightness is required at the connection between the pump and piping so that sewage does not leak to the surroundings during pump operation.

  According to this embodiment, since the submersible motor pump which can be continuously operated in the air is disposed in a liquid tank such as a sewage tank, no pipe is disposed outside the suction water tank. Thereby, the possibility that the outside of the suction water tank may be contaminated with dirty water in the pipe can be reduced. Further, there is no need to provide a pump pipe or the like outside the suction water tank, and there is no need to provide a suction pipe. If it is adopted in an existing building, the water shut-off time during installation work is shortened.

Further, as an example, the cooling suppression mechanism of the submersible motor pump capable of continuous operation in the air suppresses the saturation temperature of the submersible motor pump to a predetermined abnormal temperature or less during continuous operation in gas.

  In the second embodiment, the liquid tank is a sewage tank that stores sewage and miscellaneous wastewater generated from buildings and other facilities, and the submersible pump discharges the liquid that flows in and is stored in the sewage tank, The pump according to the first embodiment, wherein the pump system is capable of continuously operating the submersible motor pump activated under a predetermined start condition until the water level in the sewage tank becomes less than the stop water level. It has a system configuration.

  In the third mode, the liquid tank is a panel tank or a barrel provided in a dry pit in the basement of the building. The configuration of the pump system according to the first mode or the second mode, Adopted.

  In the fourth embodiment, any one of the first to third embodiments has a pump attachment / detachment device for attaching / detaching the discharge tube of the submersible motor pump to the connection tube installed in the liquid tank. The configuration of the pump system described in the above is adopted.

  In the fifth embodiment, the liquid system is dirty water, and the pump system according to any one of the first to fourth embodiments is adopted.

  In the sixth aspect, the motor pump is configured as a pump system according to any one of the first to fifth aspects, which can be activated at predetermined time intervals.

  In the seventh aspect, the length of the predetermined time interval can be set according to a change in ambient temperature, and the configuration of the pump system according to the sixth aspect is adopted.

  In the eighth aspect, the length of the predetermined time interval can be set according to the amount of liquid flowing into the liquid tank, The pump according to the sixth aspect or the seventh aspect It has a system configuration.

  In 9th form, the said submersible motor pump has the suction pipe extended below the said submersible motor pump, The structure called the pump system of any one of the 1st form thru | or 8th form characterized by the above-mentioned. Is adopted. According to the present embodiment, since the suction pipe extending below the pump is installed, the sewage can be sucked to a lower water level, and the residual sewage can be reduced.

  In a tenth aspect, the first aspect or the second aspect has a plurality of the submersible motor pumps, and the number of the submersible motor pumps to be operated varies depending on the amount of the liquid accumulated in the liquid tank. The configuration of the pump system according to any one of the ninth aspects is adopted.

  In an eleventh aspect, the first to thirteenth aspect is characterized in that a plurality of the submersible motor pumps are provided, and the number of the submersible motor pumps to be operated varies according to the amount of the liquid flowing into the liquid tank. The configuration of the pump system according to any one of the nine embodiments is adopted.

  In the 12th form, the structure of the malodor prevention type drainage equipment using the pump system of any one of the 1st form thru | or the 11th form is taken.

In addition, it is preferable to provide an inclination in the bottom face of the liquid tank, and to provide an underwater motor pump in the lowest inclination part. Thereby, residual sewage can be reduced compared with the case where there is no inclination. Moreover, you may provide a pre-rotation tank below the submersible motor pump. The pre-swirl tank is a device that generates a vortex using the flow of sewage generated when the pump sucks sewage. The pre-swirl tank is installed in the lower part of the pump, and in combination with a suction pipe extending below the pump, the suspended matter and sediment remaining in the tank are vortexed and discharged. Residual objects can be reduced. Moreover, it is good also as adding the raising / lowering apparatus for conveying an underwater motor pump to the exterior from the inside of a liquid tank. In this case, since the submersible motor pump can be maintained in the underground space provided in the upper part of the liquid tank without entering the liquid tank, for example, the maintenance can be performed safely and hygienically.

In a thirteenth aspect, in order to discharge the liquid from a liquid tank capable of storing liquid, the liquid tank has at least two submersible motor pumps installed in the liquid tank, and the submersible motor pump is continuous in the air. A pump replacement method for a pump system comprising a cooling mechanism that suppresses the temperature of the submersible motor pump in operation to a predetermined temperature or lower,
Discharging the liquid using at least one of the submersible motor pumps to expose a fixture to the base of the submersible motor pump that is a replacement target of the submersible motor pump; A step of carrying out the submersible motor pump out of the liquid tank, and a step of carrying in a submersible motor pump as an alternative to the submersible motor pump to be replaced into the liquid tank. It adopts a configuration called an exchange method.

It is a whole lineblock diagram of pump equipment using a pump system by one embodiment. It is a schematic diagram showing the structure of the motor pump by one embodiment. It is a control flow figure of a control device by one embodiment. It is a whole lineblock diagram of pump equipment using a pump system by one embodiment. It is a control flow figure of a control device by one embodiment. It is a control flow figure of a control device by one embodiment. It is a control flow figure of a control device by one embodiment. It is a control flow figure of a control device by one embodiment. It is a control flow figure of a control device by one embodiment. It is a block diagram of the control apparatus by one Embodiment. It is a whole block diagram of the panel tank by one Embodiment. It is a whole lineblock diagram of a barrel by one embodiment. It is explanatory drawing of the pump system which comprised the pump attachment / detachment apparatus by one Embodiment. It is a figure which shows the state which installed the pump attachment / detachment apparatus in the base via the foundation plate. Fig.15 (a) is a top view of a base plate, FIG.15 (b) is a side view, FIG.15 (c) is a front view. It is a figure which shows the state which installed the pump attachment / detachment apparatus in the foundation via the foundation plate concerning another embodiment. 17A is a plan view of the base plate, FIG. 17B is a side view, and FIG. 17C is a front view. It is a figure which shows the state just before installing a pump attachment or detachment apparatus in a base via a foundation plate. It is a figure which shows the structure of a foundation plate. 20A is a plan view of the base plate, and FIG. 20B is a side view. The outline of the pump equipment before replacement is shown. It is a figure explaining the preparatory work for replacement | exchange of a motor pump. It is a figure explaining the work after the water level in a sewage tank becomes a stop water level. It is a figure explaining the work after the enclosure by a board is complete | finished. It is a figure explaining the operation | work after the drainage inside the enclosure of a motor pump is complete | finished. It is a figure explaining the operation | work after carrying out a motor pump out of a tank. It is a figure explaining the operation | work after a new foundation plate is fixed to the bottom face with the foundation bolt. It is a figure explaining the operation | work after a new motor pump is installed. The whole flow of exchange work of a pump attaching / detaching device is shown.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding members may be denoted by the same reference numerals and redundant description may be omitted. Further, the features shown in each embodiment can be applied to other embodiments as long as they do not contradict each other.

  With reference to FIG. 1, the whole structure of the pump system 10 by this embodiment is demonstrated. FIG. 1 is an overall configuration diagram of a pump facility 500 (drainage facility) using a pump system according to an embodiment. The pump facility 500 is a pump and a pump drive unit for draining various liquids (hereinafter collectively referred to as “liquid”) such as middle water, rain water, and sewage stored in the drain tank 20. A motor pump P having a certain motor, a control device 100 for controlling the motor pump P, and a pump system 10 having the motor pump P are used. Specifically, the pump facility 500 includes a drain tank 20 (liquid tank) that can store a liquid, a motor pump P installed in the drain tank 20, and a water level detector 40 that detects the water level in the drain tank 20. And a control device 100 for controlling the operation of the motor pump P. The motor pump P is a submersible motor pump in a tank that can be continuously operated in gas.

  The drainage tank 20 is a building pit that is a sewage pit provided at a position lower than the public sewer under the building 1000. In this embodiment, the liquid tank is a bill pit, but the liquid tank is a water tank provided on the ground, a sewage pit such as industrial water, a panel tank provided in a dry pit or a pump room, or a barrel. Even in this case, the pump system 10 of the present embodiment can be applied. Here, the dry pit is a pit that is provided with a liquid tank for storing the liquid to be transferred by the motor pump P, and is waterproof so that it should be safe even if liquid overflows from the liquid tank. is there. A panel tank is a water tank formed by combining a plurality of panel members. A barrel is a small cylindrical water tank. In the present embodiment, the liquid is sewage, but the present embodiment can also be applied when the liquid is clean water, middle water, or waste liquid other than sewage.

  In the pump facility 500 according to the present embodiment, the basement portion B of the building 1000 has sewage and miscellaneous drainage (hereinafter referred to as “sewage etc.”) generated in the basement portion B further down through the inflow pipe 12. It is temporarily stored in the drainage tank 20 installed. Thereafter, sewage and the like are pumped up to the sewage basin 91 by the motor pump P and drained into the public sewer pipe 80 through the sewage basin 93. In addition, the sewage etc. which generate | occur | produce in the 1st floor or more part of the building 1000 may be drained to the sewage basin 91 directly under natural flow, or may be drained to the drainage tank 20 and drained by the motor pump P.

  The drainage tank 20 has a substantially rectangular parallelepiped shape (box shape) as a whole, and has an internal space defined by a bottom surface 20b, a side surface 20s, and a top surface 20u. The pump facility 500 includes an inflow pipe 12 and an outflow pipe 21. Sewage discharged in the building 1000 flows into and is stored in the drain 20 through the inflow pipe 12. When the motor pump P is operated, sewage is drained out of the drain 20 through the outflow pipe 21 connected to the motor pump P. The pump facility 500 further includes a pre-swirl tank 60 on the bottom surface 20 b of the drain tank 20, and in combination with the motor pump P, floats and sediments are involved and discharged. Of the bottom surface 20 b, except for the portion where the pre-swirl tank 60 is provided, the sewage flowing into the drain tank 20 is guided to the pre-swirl tank 60 by being inclined toward the pre-swirl tank 60.

  As shown in FIG. 2 described later, the motor pump P includes a suction casing 222a, a pump casing portion 2 that houses the impeller 221, and a motor portion 4 (electric motor) that provides rotational driving force to the impeller 221. Prepare. Further, the motor pump P may have a suction pipe 22 extending below the suction port 222a of the motor pump P. In this embodiment, the motor pump P is a submersible motor pump that can be used by putting the entire pump in the liquid together with the electric motor. Thereby, even if the motor part 4 of the motor pump P is flooded, it is possible to realize a drainage facility capable of draining without failure. As an example of the electric motor used for the submersible motor pump, there is a canned motor pump whose inside is liquid-filled, gas-filled or canned, and the motor pump P may be a canned motor pump.

  In this specification, continuous operation by the motor pump P in a state where the motor unit 4 of the motor pump P is exposed to gas on the liquid level (that is, a state where the liquid level is lower than the motor unit 4 requiring cooling). This is called “continuous operation in the air”. Hereinafter, in the present embodiment, the number of motor pumps P in the pump system 10 will be described as one, but two or more may be used.

  The motor pump P can be continuously operated in the air. Specifically, the motor pump P includes a cooling mechanism (details will be described later with reference to FIG. 2) for suppressing a temperature increase of the motor unit 4, and the cooling mechanism is, for example, a motor unit that is operating in the air By suppressing the temperature of 4, the temperature of the submersible motor pump can be suppressed to a predetermined temperature (for example, an abnormal temperature that is a temperature at which the motor pump P fails) or less.

  Specifically, in continuous operation, the motor pump P rises in temperature and is saturated at a predetermined temperature. Hereinafter, the temperature of the motor pump P saturated in continuous operation is referred to as a saturation temperature. The cooling mechanism provided in the motor pump P suppresses the saturation temperature of the motor pump P to a predetermined temperature or lower. If the saturation temperature is higher than the abnormal temperature, the motor pump P needs to be stopped before reaching the saturation temperature. Since the motor pump P includes a cooling mechanism, the saturation temperature of the motor unit 4 is maintained at an abnormal temperature or less even if continuous operation in the air is performed. In this specification, this is defined as being capable of continuous operation in the air. That is, the motor pump P can be continuously operated in the air. The state in which the water level in the drain tank 20 is lower than the motor section 4 during the operation of the motor pump P and the motor section 4 is liquid with the liquid in the drain tank 20. This means that the temperature rise of the motor unit 4 can be suppressed to an abnormal temperature of the motor pump P or less, and the drainage can be continued even when the motor cannot be cooled.

  As an example in the present embodiment, the motor pump P is a single-suction single-stage centrifugal pump that handles sewage / miscellaneous wastewater having a solid size of 20 mm or less contained in the carrier liquid.

  The water level detector 40 detects the current level of sewage in the drain tank 20. The water level detector 40 is, for example, a float type water level detector. Specifically, the water level detector 40 includes a float 40a for detecting the pump stop water level HL, a float 40b for detecting the pump activation water level H1, and a float 40c for detecting the full water level HH. The water level detector 40 only needs to be able to detect at least the pump stop water level HL, and may be a water level meter such as a throw-in type water level sensor.

  According to this embodiment, the pump stop water level HL is a water level for stopping the motor pump P below the pump stop water level HL, and is higher than the suction port of the suction pipe 22 of the motor pump P, And it is good to set to the height equivalent to the suction inlet of the suction pipe 22 as much as possible. As a result, the motor pump P can be prevented from sucking air during operation, and the amount of sewage remaining in the drain tank 20 after stopping the motor pump P can be minimized.

The pump start water level H1 is a water level for starting the motor pump P when the water level in the drain tank 20 reaches the water level equal to or higher than the pump start water level H1. Determined by.

  Specifically, the pump activation water level H1 is generally higher than the upper ends of the rotor and stator (for example, 242 and 243 in FIG. 2) in the motor unit 4. For example, as the mechanism of the motor unit 4, the pump activation water level H1 may be set to be several centimeters above the drive power cable (for example, 245 in FIG. 2) connected to the upper part of the motor unit 4. As another example, the pump start water level H1 may be a position where a bearing (for example, 246 in FIG. 2) sliding with the main shaft 241 is submerged. However, since the motor pump P can be continuously operated in the air, the startup water level H1 may be a water level at which the motor unit 4 is exposed, that is, a water level at which the operation of the motor pump P becomes a continuous operation in the air.

  The full water level HH is a reference for determining the full water state of the drainage tank 20 above the full water level HH, and is set to a height close to the upper surface 20u of the drainage tank 20 at a position higher than the pump activation water level H1. .

  The control device 100 is cable-connected to the motor pump P and the water level detector 40, and controls the operation of the motor pump P according to the water levels HL, H1, and HH described above. As shown in the figure, the control device 100 is connected to the motor pump P through the power cable 50 and is connected to the water level detector 40 through the signal cable 41. The control device 100 is also connected to an external commercial power source (not shown). With this connection, the control device 100 appropriately controls and supplies drive power to the motor unit 4 in accordance with the water level detection signals (40a, 40b, and 40c) from the water level detector 40, and operates the motor pump P. Stop. The control device 100 can implement various functions for controlling the operation of the motor pump P (for example, automatic operation, manual operation, and detection of abnormality). Further, the control device 100 may be equipped with an inverter in order to control the motor pump P at a variable speed.

  An example of the structure of the motor pump P will be described with reference to FIG. FIG. 2 is a schematic diagram illustrating the structure of a motor pump according to an embodiment. The motor pump P includes an impeller 221 that rotates about an axis AL, a pump casing portion 2 that houses the impeller 221, and a pump bracket 223. The impeller 221 is connected to the main shaft 241 of the motor unit 4 and rotates as the main shaft 241 rotates. The pump casing portion 2 has a suction port 222a and a discharge port 222b, and forms a pump casing that defines a liquid flow path together with the pump bracket 223. The suction pipe 22 is connected to the suction port 222a. The pump bracket 223 is engaged with the pump casing portion 2 using screws (not shown) or the like, and covers the back surface (upper side in FIG. 1) of the impeller 221. The pump bracket 223 is preferably formed of a material having high thermal conductivity, such as an aluminum alloy or a copper alloy.

  The motor unit 4 provides a rotational driving force to the impeller 221. The motor unit 4 includes a main shaft 241 that rotates about the axis AL, a rotor 242 that rotates integrally with the main shaft 241, and a stator 243 provided on the outer peripheral side of the rotor 242. The motor unit 4 includes a motor frame 244. The motor frame 244 is formed in a substantially cylindrical shape, and the stator 243 is fixed to the inner peripheral surface. The motor frame 244 may be made of stainless steel or a metal such as an aluminum alloy or a copper alloy. When the impeller 221 is rotated by driving the motor unit 4 to pressurize the transport liquid, the sewage is pumped from the suction port 222a to the discharge port 222b.

Next, the structure of the cooling mechanism for suppressing the temperature of the motor pump P to an abnormal temperature or less during continuous operation in the air will be described. An example of the cooling mechanism in the motor pump P is shown in FIG. In FIG. 2, a cooling jacket 270 is provided on the outer periphery of the motor frame 244, and the cooling jacket 27 is provided.
It is configured so that the cooling liquid is enclosed in zero. This cooling liquid is sealed between the motor frame 244 and the cooling jacket 270 in order to cool the heat generated by the motor unit 4, and propylene glycol or the like is used as an example. Further, the circulation blade 271 attached to the main shaft 241 is rotated to circulate the coolant in the cooling jacket 270. By this circulation, heat exchange is performed between the motor unit 4 and the pump bracket 223, and the heat generated in the motor unit 4 can be released to the carrier liquid. In the case of the structure, since the transport liquid (sewage) in the motor pump P does not enter between the cooling jackets 270, the motor unit 4 can be cooled without being affected by the quality of the transport liquid, and maintenance, particularly cleaning, can be performed. It becomes easy. If the heat of the coolant can be released by some means, circulation by the circulation blade 271 is not necessary. That is, the motor unit 4 may be cooled by heat exchange between the cooling liquid in the cooling jacket 270 and the liquid in the pump bracket 223, and the motor pump P may be maintained at an abnormal temperature or lower. Instead of circulation by the circulation blades 271, the cooling jacket 270 may include a pipe (not shown) that cools the coolant by spraying the coolant onto the pump bracket 223. Further, instead of circulation by the circulation blade 271, a cooling rod that can exchange heat with the coolant in the cooling jacket 270 and the pump bracket 223 may be used.

  As another example of the cooling mechanism of the motor pump P, a cooling fin (not shown) can be provided around the motor unit 4 and the outside air can be introduced through the cooling fin. Cooling fins are provided on the outer periphery of the motor frame 244 to cool the motor unit 4 by air-cooling and dissipating heat generated by the motor unit 4. The structure is simple and can be mounted relatively inexpensively. In addition, it is also possible to suppress the motor pump P to an abnormal temperature or less by continuous operation in the air by adopting the motor unit 4 having a larger capacity than that required for pumping.

  As another example of the cooling mechanism of the motor pump P, a cooling jacket 270 is provided on the outer periphery of the motor frame 244, and pumped water pressurized by the impeller 221 between the cooling jacket 270 and the motor frame 244 is introduced into the inlet (not shown). ). The pumped water passing between the cooling jacket 270 and the motor frame 244 is discharged from a return pipe (not shown). That is, a part of the pumped water by the motor pump P is used as cooling water for the motor unit 4. The structure has a higher cooling effect than the structure of the cooling fin.

  Returning to FIG. 1, the pump system 10 of this embodiment is used in a pump facility 500. In the pump facility 500, the basement part B of the building 1000 is located below a public sewer pipe (not shown), and sewage and miscellaneous drainage (hereinafter referred to as “sewage etc.”) generated in the basement part B. The water is temporarily stored in a drainage tank 20 (bill pit) installed further below through the inflow pipe 12. Thereafter, sewage and the like are pumped up to the sewage basin 91 by the motor pump P and drained into the public sewer pipe 93 through the sewage basin. In addition, the sewage etc. which generate | occur | produce in the 1st floor or more part of the building 1000 may be drained into the sewage basin 91 usually directly under natural flow. An opening 15 is formed in the drainage tank 20, and an opening lid 16 (for example, a manhole lid) is attached to the opening 15.

  Next, the control device 100 that controls the operation of the motor pump P will be described. FIG. 10 is an exemplary functional block diagram of the control device 100. FIG. 3 is a control flow diagram. As shown in FIG. 10, the control device 100 includes a detection unit 120 that detects the level of sewage in the drain tank 20 and the state of the motor pump P, a processing unit 140 that executes information processing, and a storage unit 160 that stores various types of information. Etc. are included. Each functional block is implemented as part of software and / or hardware. In addition to the above, the control device 100 instructs the operation of stopping the operation of the motor pump P and a display unit (not shown) for displaying the state of the motor pump P and the drainage tank 20, and changing various set values. You may provide the operation part (not shown) etc. to perform. Moreover, the control apparatus 100 is good also as a control panel comprised only by a relay sequence. Note that these functional blocks are merely examples, and are not limited thereto.

  The detection unit 120 and the processing unit 140 are executed by a processing device such as a CPU (Central Processing Unit). The detection unit 120 inputs various signals detected by the pump equipment 500. The detection unit 120 includes a water level detection unit 122 that detects the liquid level by interaction with the water level detector 40, and a pump state detection unit 124 that detects a pump state by interaction with the motor pump P. Moreover, the detection part 120 inputs the temperature detection value from the temperature sensor 52 mentioned later. The water level detector 122 inputs the water level data detected by the water level detector 40 by the floats 40a, 40b, and 40c, and determines, for example, the water levels HL, H1, and HH in FIG. Determine the water level status regarding whether the water level is between. Moreover, the detection part 120 specifies the period in each water level state based on water level data in cooperation with the timer part 144. For example, the pump state detection unit 124 may detect the current of the motor unit 4 of the motor pump P to determine the operation status (for example, operation / stop / failure), or may use a failure detector such as thermal. In addition, these signals may be input. The determination of the operation / stop of the motor pump P may be performed by using the operation command and stop command of the pump command unit 146.

  The processing unit 140 includes a timer unit 144 that includes timers T0, T1, T2, TM, and the like that time periods according to various states such as the operating status of the motor pump P and the water level so as to realize the operation of the control flow described later. And a pump command unit 146 that outputs various control signals such as operation / stop to the motor pump P.

  The storage unit 160 of the control device 100 is not limited to this, but is a volatile memory (for example, RAM (Random Access Memory)), a non-volatile memory (for example, ROM (Read Only Memory), flash memory, etc.) or any A combination of memory is implemented. The storage unit 160 stores various setting information, control information, various elapsed times, various history information, and the like for controlling the pump system 10. Setting information that can be changed by the user is stored in the setting unit 162.

  First, an outline of control of the motor pump P will be described. The control is performed using a start-up timer (timers T0, T1, T2), which will be described later, and a water level detector 40. The start timer is a timer for starting the motor pump P every predetermined time interval ΔT. The start-up timer forcibly starts the motor pump P when a certain time (that is, set times (ΔTM0, ΔTM1, ΔTM2) by the start-up timers (timers T0, T1, T2)) have elapsed since the motor pump P stopped. Used for. That is, the time interval ΔT is related to the length of the set time, and the length of the set time can be arbitrarily set in the present embodiment. As described above, the conventional set time is determined by JIS as follows: “A pump with an electric motor exposed on the water surface can be operated without any problem for 30 minutes after the electric motor starts to be exposed to the atmosphere during operation. , The stop time from the stop to the restart is longer than the start time from the start of exposure until the stop. ” there were.

Submersible motor pumps used in conventional pump systems are designed so that the saturation temperature is below the abnormal temperature by cooling the entire pump in the liquid together with the electric motor. It is assumed that the temperature becomes higher. Therefore, the submersible motor pump used in the conventional pump system is restarted from a predetermined time limit for stopping the continuous operation in the air and / or from stopping the continuous operation in the air so that the abnormal temperature is not reached during the continuous operation in the air. A predetermined cooling period until activation is set, and the drainage is limited by the time limit and / or the cooling period. Here, in JIS, there is a description that “the motor can be operated without any problems for 30 minutes after it begins to be exposed to the atmosphere”, and the conventional time limit is, for example, 30 minutes or more and is used for temperature rise It is set to a time that allows continuous operation in the air below the abnormal temperature. In addition, in JIS, there is a description that "the stop time from the stop to the restart is longer than the operation time from the start of exposure until the stop", and the conventional cooling period is as follows.
As an example, the operation time of the previous continuous air operation is set.

  In the present embodiment, since the motor pump P can be continuously operated in the air, there is no restriction on the time limit or the cooling period. Therefore, the length of the set time can be arbitrarily set by the control device 100. In addition, since the time interval ΔT of the start timer and the length of the set time (ΔTM0, ΔTM1, ΔTM2) do not depend on the continuous air operation time (time limit, cooling period), the user sets the set value information. May be.

  Thereby, in the pump system 10 of this embodiment, there exist the following effects. When the bill pit becomes the drainage tank 20, the bill pit has time for the water level to drop from the start water level H1 to the pump stop water level HL because the area of the bottom surface 20b is large. In that case, the motor pump P of this embodiment can continue the continuous operation in the air until the water level of the drainage tank 20 becomes equal to or lower than the pump stop water level HL. The conventional submersible motor pump needs to be stopped once the continuous operation in the air exceeds the time limit. Or / and the conventional submersible motor pump cools the motor part 4 whose temperature has been increased in the continuous operation in the air, and when the motor pump P becomes below the failure temperature when it is operated next time, A cooling period is required to delay. However, if the motor pump P is capable of continuously operating in the air according to the present embodiment, the saturation temperature of the motor pump P that is continuously operating in the air can be suppressed to the failure temperature or lower. Regardless of the cooling period, the activation timer can be arbitrarily set, and the operation of the motor pump P can be started periodically to prevent stagnation of sewage in the drain tank 20. Further, even when a large amount of drainage flows into the drainage tank 20 immediately after the motor pump P stops the continuous operation in the air and becomes a water level higher than the starting water level H1, the control device 100 may limit the time limit and / or Since the motor pump P can be operated without providing a cooling period, drainage can be performed quickly.

  Further, the time interval ΔT and the length of the set time can be set according to the season and time. The control device 100 can input the temperature detection value from the temperature sensor 52 installed in the drain tank 20 via the signal cable 54. The temperature sensor 52 may measure the ambient temperature in the drain tank 20 and / or the temperature of sewage. For example, when the ambient temperature or the temperature of sewage is high, such as in summer or in the daytime, the sewage staying in the drain tank 20 is likely to rot, so the control device 100 may operate the motor pump P frequently. Specifically, the ambient temperature or the temperature of the liquid is measured by the temperature sensor 52. For example, if the temperature is higher than a predetermined reference value, the setting time of the start timer is made shorter than the predetermined reference time, and the temperature is predetermined. If it is lower than the reference value, the control device 100 may calculate the set time by making the set time of the activation timer longer than a predetermined reference time. The temperature sensor 52 only needs to be able to measure a change in temperature in the drain tank 20 and may be provided in the same floor as the control device 100 such as the control device 100 or in the control device 100. If it does so, compared with providing a temperature sensor in the drain tank 20 or in a pit, wiring work will become easy.

  FIG. 4 is a configuration diagram of a pump facility 500 using the pump system 10a according to the embodiment. The pump equipment 500 uses a pump system 10 a instead of the pump system 10. The pump system 10a includes motor pumps P1 and P2 including a pump and a motor that is a pump driving device, and a control device 100 that controls the motor pumps P1 and P2. In FIG. 4, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted or simplified. Similarly to the motor pump P of the pump system 10, the motor pump P <b> 1 and the motor pump P <b> 2 include a cooling mechanism that suppresses the saturation temperature during continuous operation in air to an abnormal temperature or less. Hereinafter, when it is not particularly necessary to distinguish between the motor pump P1 and the motor pump P2, they are referred to as a motor pump P. The pump system 10a of FIG. 4 includes a plurality of submersible motor pumps P, and all the submersible motor pumps P installed in the liquid tank 20 can be continuously operated in the air.

The control apparatus 100 controls operation | movement of the motor pump P of the pump system 10a according to the control flow as described in FIGS. In the control flow shown in FIG. 3, the control device 100 controls to operate only one of the motor pump P1 and the motor pump P2 when the amount of sewage to be drained in the liquid tank 20 is small. When the amount of sewage to be drained in 20 is large, both the motor pump P1 and the motor pump P2 are controlled to operate simultaneously. In the following, the first motor pump that starts first is referred to as a first pump, and the second motor pump that starts next is referred to as a second pump. Further, in the control flow shown in FIG. 3, it is also considered that the two motor pumps P1 and P2 are operated as evenly as possible.

  When power is applied to the control device 100 and automatic operation is started, the entire control flow in FIG. 3 is started (step S10). Or step S10 may be started according to the instruction | indication from a user. In step S12, the starting pump is the motor pump P1, and the subsequent pump is the motor pump P2.

  Next, the timer T1 and the timer T2 are reset (step S14). Timers T1 and T2 correspond to motor pumps P1 and P2, respectively. The timers T1 and T2 are for measuring the stop time for each pump, and are timers for preventing the motor pumps P1 and P2 from being stopped for a long time. When the measurement times by the timers T1 and T2 become longer than the set times ΔT1 and ΔT2, respectively, the pump whose stop time is longer by the steps described later may be used as the first pump. The reason for preventing the motor pumps P1 and P2 from being stopped for a long time is that if the stop time becomes longer, the rotating parts such as the impeller 221 and the main shaft 241 and the fixed parts such as the pump casing part 2 and the pump bracket 223 It is because it becomes easy to cause a start-up failure due to fixing with rust or the like, or sewage in the liquid tank 20 is retained, which causes a bad odor. The two set times ΔT1 and ΔT2 can be the same time or different times.

  Next, the timer T0 is reset, and then the timer T0 is started to start time measurement (step S16). The timer T0 is for measuring the time during which all the pumps (both motor pumps P1 and P2) are stopped, and is a timer for preventing the sewage from staying in the drain tank 20 for a long time. .

  Next, the control device 100 determines whether or not the current water level WL is lower than the pump stop water level HL (step S18). When the water level WL is lower than the pump stop water level HL (step S18: Yes), the control device 100 continues to determine whether the water level WL is lower than the pump stop water level HL until the water level WL becomes equal to or higher than the pump stop water level HL. To do. When the water level WL is equal to or higher than the pump stop water level HL (step S18: No), the control device 100 proceeds to the pump start flow (step S20).

  The pump start flow in step S20 is shown in FIG. In the pump start flow, the control device 100 first determines whether or not the current water level WL is equal to or higher than the pump start water level H1 (step S110). When the water level WL is equal to or higher than the pump start water level H1 (Yes), the control device 100 activates the previously set starting pump (step S112). Thereafter, the process proceeds to step S22 shown in FIG.

  In step S110, when the water level WL is less than the pump start water level H1 (No), the control device 100 determines whether or not the time measurement value by the timer T0 is longer than the set time ΔT0 (step S114). When the time measured value by the timer T0 is equal to or longer than the set time ΔT0 (YES), there is a possibility that the sewage stays in the drainage tank 20 for the time interval ΔT, so the control device 100 is already set. The starting pump is activated (step S112). Thereafter, the process proceeds to step S22 shown in FIG.

In step S114, the time measurement value by the timer T0 is less than the set time ΔT0 (No
), The process proceeds to step S116, and the control device 100 determines whether one of the motor pumps P1, P2 is in a stopped state for the time intervals ΔT1, ΔT2. That is, it is determined whether or not an allowable stop time has been exceeded. First, it is determined whether or not the time measurement value by the timer T1 is equal to or longer than the set time ΔT1 (step S116). When the time measured value by the timer T1 is equal to or longer than the set time ΔT1 (Yes), the motor pump P1 is in a stopped state for the time interval ΔT1 or longer, so the first pump is the motor pump P1 and the second pump is the motor pump P2 ( Step S118). Thereafter, the set starting pump is activated (step S112). Thereafter, the process proceeds to step S22 shown in FIG.

  In step S116, when the time measured value by the timer T1 is less than the set time ΔT1 (No), the process proceeds to step S120 in order to determine whether or not the motor pump P2 is stopped for a time interval ΔT2 or more. In step S120, it is determined whether or not the time measurement value by the timer T2 is equal to or longer than the set time ΔT2. When the time measured value by the timer T2 is equal to or longer than the set time ΔT2 (Yes), the motor pump P2 is in a stopped state for the time interval ΔT2 or longer. (Step S122). Thereafter, the set starting pump is activated (step S112). Thereafter, the process proceeds to step S22 shown in FIG.

  In step S120, when the time measurement value by the timer T1 is less than the set time ΔT1 (No), both the motor pumps P1 and P2 are in the stop state for less than the time interval ΔT, and the water level WL is the pump start water level. Since it is less than H1, the process proceeds to step S22 shown in FIG. 3 without starting the pump. Note that the order of the determination in step S116 and the determination in step S120 may be interchanged. Further, it may be determined from the starting pump that the stop time is exceeded.

  Returning to FIG. 3, step S22 and subsequent steps will be described. In step S22, it is determined whether the starting pump has been started. When the starting pump is not started (No), the process returns to step S18. When the starting pump is started (Yes), the process proceeds to step S24. In step S24, it is determined whether or not the current water level WL is less than the pump additional water level H2. When the water level WL is equal to or higher than the pump additional water level H2 (No), the process proceeds to the pump addition flow in step S26. In addition, when the pump system 100a is provided with three or more motor pumps P, it is good that there are pump additional water levels corresponding to the number.

  The pump addition flow is shown in FIG. In the pump addition flow, first, it is determined whether there is a later pump that can be started (step S210). When there is no failure or the like in the other motor pumps P of the activated motor pump P, it is determined that there is a later pump that can be activated because there is a later pump that can be activated (Yes). Further, the control device 100 stores the number of parallel operation of the motor pumps P, and if the number of motor pumps in operation is within the number of parallel operation, it is determined that there is a later pump that can be started (Yes). Also good. If step S210 is Yes, the later pump is started (step S212). Thereafter, the process proceeds to step S28 shown in FIG.

  In step S210, when there is no later pump that can be activated, such as when all the motor pumps P are activated or are not activated due to a failure or the like, the control device 100 has no later pump that can be activated. (No) is determined. Thereafter, the process proceeds to step S28 shown in FIG.

  Returning to FIG. 3, when the current water level WL is lower than the pump additional water level H2 (Yes) in step S24, the flow proceeds to step S28 without performing the pump addition flow in step S26.

  Next, step S28 will be described. In step S28, it is determined whether or not the current water level WL is lower than the pump stop water level HL. When the water level WL is equal to or higher than the pump stop water level HL (No), it is determined that the water level has not dropped to the stop water level HL, and the process proceeds to step S24 to determine whether or not a pump needs to be added. When the water level WL is lower than the pump stop water level HL (Yes), the process proceeds to the pump stop flow (step S30).

  The pump stop flow is shown in FIG. In the pump stop flow, first, it is determined whether or not the operating pump is the motor pump P1 (step S310). When the operating pump is the motor pump P1 (Yes), the process proceeds to step S312, the timer T1 is reset, and then the timer T1 is started to start time measurement. The time during which the motor pump P1 is stopped is measured by the timer T1. Thereafter, the process proceeds to step S314. In step S310, when the operating pump is not the motor pump P1 (No), the process proceeds to step S314.

  In step S314, it is determined whether the operating pump is the motor pump P2. When the operating pump is the motor pump P2 (Yes), the process proceeds to step S316, the timer T2 is reset, and then the timer T2 is started to start time measurement. The time during which the motor pump P2 is stopped is measured by the timer T2. Thereafter, the process proceeds to step S318. In step S314, when the operating pump is not the motor pump P2 (No), the process proceeds to step S318.

  In step S318, all motor pumps P in operation are stopped. Thereafter, the starting pump is rotated (step S320). The rotation of the starting pump is to replace the starting pump between the motor pump P1 and the motor pump P2. For example, when the starting pump is the motor pump P1, the starting pump is set to the motor pump P2. After the rotation of the starting pump, the process proceeds to step S16 shown in FIG. 3, and the above-described procedure after step S16 is repeated.

The rotation of the starting pump when there are three or more pumps can be performed as follows, for example. When the first motor pump P to be started is called the first machine, the next motor pump P to be started is called the first machine 1, and the last motor pump P to be started is called the second machine 2, the allocation state of these three motor pumps P Consider the following three states.
State A starting machine = motor pump P1, succeeding machine 1 = motor pump P2, succeeding machine 2 = motor pump P3
State B: starting machine = motor pump P2, starting machine 1 = motor pump P3, starting machine 2 = motor pump P1
State C: starting machine = motor pump P3, following machine 1 = motor pump P1, following machine 2 = motor pump P2
Every time the motor pump P is stopped and the starting pump is rotated in step S320, the state is switched from state A to state B to state C to state A.

  In the embodiment shown in FIG. 3 described above, the number of motor pumps P to be operated varies depending on the amount of sewage accumulated in the drain tank 20. Next, an embodiment in which the number of operating motor pumps P changes according to the amount of the sewage flowing into the drain 20 will be described with reference to FIGS. The control device 100 controls the operation of the motor pumps P1 and P2 shown in FIG. 4 according to the control flow shown in FIGS.

In the embodiment shown in FIG. 3, the motor pump P1 using the water levels HL, H1, H2, and HH of the water level detector 40 that measures the amount of sewage accumulated in the drain tank 20 and the start-up timers T0, T1, and T2. , P2 was activated. However, in the water level detector 40 used for sewage, foreign matters may be caught in the contact portion or the like, so that the accurate water level may not be detected transiently. In the embodiment shown in FIGS. 8 and 9, since the motor pumps P1 and P2 are started periodically (for example, 30 minutes) by the start timer regardless of the water level indicated by the water level detector 40, the water level detector detects the water level incorrectly. It can prevent starting failure. As a result, the odor prevention effect is improved. In this case, since at least one of the motor pumps P is always operated in a certain period, it may not be possible to detect a starting water level higher than the water level HL. Therefore, the water level detector 40 of the present embodiment includes at least It is sufficient if the water level HL can be detected.

The length of the time interval ΔT at which at least one of the motor pumps P is operated can be set according to the amount of sewage flowing into the drain tank 20. For example, the control device 100 learns the time interval ΔT at which the motor pump P is activated by the water level detector 40 at 24 hours a day, and learns the amount of sewage for each time zone of 24 hours a day. Thus, predictive control related to the operation of the motor pump P may be performed. For example, two motor pumps P are installed in the drain tank 20,
・ When the amount of sewage is high, start up two units at the same time.
・ When the amount of sewage is high, start up two units at the same time.
Predictive control is performed.

  The control flow diagrams 8 and 9 will be described below. When power is applied to the control device 100, the entire control flow in FIGS. 8 and 9 is started (step S50). Or step S50 may be started according to the instruction | indication from a user. In step S52, the starting pump is the motor pump P1, and the subsequent pump is the motor pump P2.

  Next, the timer TM0 is reset, and then the timer TM0 is started to start time measurement (step S54). The timer TM0 is for measuring the time during which all the pumps are stopped, and is a timer for preventing the sewage from staying in the drain tank 20 for a long time. When the measurement time by the timer T0 becomes longer than the set time ΔTM0, at least one pump is started by the steps described later. The timer TM0 is an interval timer for starting the pump every 30 minutes (ΔTM0 = 30 minutes), for example. ΔTM0 may be variable depending on the ambient temperature of the pump. For example, ΔTM0 = 30 minutes can be set when the ambient temperature is 30 ° C. or higher, and ΔTM0 = 60 minutes can be set when the ambient temperature is 20 ° C. or lower. The higher the ambient temperature, the shorter the set time ΔTM0.

  Next, it is determined whether or not the time measurement value by the timer TM0 is longer than the set time ΔTM0 (step S56). When the time measurement value by the timer TM0 is longer than the set time ΔTM0 (YES), the process proceeds to step S58. In step S56, when the time measurement value by the timer TM0 is equal to or less than the set time ΔTM0 (No), step S56 is repeated.

  In step S58, it is determined whether the current water level WL is lower than the pump stop water level HL. When the water level WL is lower than the pump stop water level HL (Yes), the determination whether the water level WL is lower than the pump stop water level HL is continued until the water level WL becomes higher than the pump stop water level HL. When the water level WL is equal to or higher than the pump stop water level HL (No), the process proceeds to step S60.

In step S60, it is determined whether the amount of water used at the current time is small. This determination is made as follows. The same time of the previous time (either the previous day or the last past week, the past month, and the past year, or the same time, the same day, the same day, and the average of the same month in any period), The water usage at the current time is predicted and judged from any of the states when the system was started on the same day, the same day, and the same month. The prediction is made as follows.
The storage unit 160 of the control device 100 has a first storage area 164 that stores the amount of water used.
・ As the previous water consumption, “Large water consumption” at the time of startup, day, day of the week, and month
Alternatively, “small amount of water used” is stored in the first storage area 164. Further, “large water usage” or “low water usage” is determined as follows.
a) When the starting pump is started and the pump additional water level H2 is reached within the set time ΔTM1, the previous water usage is changed to “large water usage” and stored in the first storage area 164.
b) When a plurality of pumps were started last time and the pump stop water level became HL or less within the set time ΔTM2, the previous water usage was changed to “small water usage” and stored in the first storage area 164. To do.
c) In a state other than a) and b), “large water usage” and “low water usage” in the first storage area 164 are not changed.
d) The timing for storing “large water usage” or “low water usage” in the first storage area 164 in steps a), b), and c) is step S70 or step S74, as will be described later.

  In step S60, when the control device 100 determines that the water usage stored in the first storage area 164 is “low water usage” and the water usage at the current time is low (Yes), the control device 100 Only the pump is started (step S62). In step S60, when the control device 100 determines that the water usage amount stored in the first storage area 164 is “high water usage amount” and the water usage amount at the current time is large (No), a plurality of items are used. The pump is started (step S64).

  In step S62, the timer TM1 is reset, and then the timer TM1 is started to start time measurement. The timer TM1 is used to determine whether or not the pump additional water level H2 has been reached within the set time ΔTM1 after starting the starting pump. In step S64, the timer TM2 is reset, and then the timer TM2 is started to start time measurement. The timer TM2 is used to determine whether or not a plurality of pumps have been started and the pump stop water level HL has become below the set stop time ΔTM2.

  Next, as shown in FIG. 9, it is determined whether or not the current water level WL is lower than the pump additional water level H2 (step S66). When the current water level WL is less than the pump additional water level H2 (Yes), the motor pump P is not additionally started, and the process proceeds to step S68. When the water level WL is equal to or higher than the pump additional water level H2 (No), the process proceeds to step S70. In step S70, it is determined whether there is a later pump that can be activated. When there is one motor pump P that is activated and there is no failure in the other one motor pump P, it is determined that there is a later pump that can be activated (Yes) because there is a later pump that can be activated. . In this case, the late pump is started (step S72). Thereafter, the process proceeds to step S68.

  In step S70, it is determined whether the time measurement value by the timer TM1 is shorter than the set time ΔTM1. When the time measurement value by the timer TM1 is shorter than the set time ΔTM1, the control device 100 stores in the first storage area 164 that “water consumption is large”. The reason for storing is that it is used for “determining whether or not the previous water usage amount is“ high water usage amount ”and the current water usage amount is small” in step S60 at a later date.

  In step S70, when there are two motor pumps P that have been activated or when the motor pump P that has not been activated is faulty and cannot be activated, there is no later pump that can be activated, so there is no later pump that can be activated. (No) is determined. Thereafter, the process proceeds to step S68.

In step S68, the control device 100 determines whether or not the current water level WL is lower than the pump stop water level HL. When the water level WL is equal to or higher than the pump stop water level HL (No), the process returns to step S66. When the water level WL is lower than the pump stop water level HL (Yes), step S7
Proceeding to 4, the control device 100 stops all the motor pumps P.

  In step S74, it is determined whether the time measurement value by the timer TM2 is shorter than the set time ΔTM2. When the time measured value by the timer TM2 is shorter than the set time ΔTM2, the control device 100 stores in the first storage area 164 that “the amount of water used is small”. The reason for storing is that it is used for “determining whether or not the previous water usage is“ low water usage ”and the current water usage is low” in step S60 at a later date.

  Thereafter, the starting pump is rotated (step S76). The rotation of the starting pump is performed in the same manner as in step S320 in FIG. Thereafter, the process returns to step S54.

Thus, the motor pump P, which is a submersible motor pump capable of continuous operation in the air, can be activated at every time interval ΔT regardless of the activation water level. Moreover, the pump system 10 has a plurality of motor pumps P that can be continuously operated in the air, and all the motor pumps P installed in the drain tank 20 suppress the saturation temperature in the continuous operation in the air to an abnormal temperature or less. The control device 100 includes a cooling mechanism, predicts the amount of liquid flowing into the drainage tank 20 that is a liquid tank, and immediately changes the number of motor pumps P to operate according to the predicted amount of liquid. Effluent and residual sewage can be reduced efficiently.

  In the above embodiment, the motor pump P that is a submersible motor pump that can be continuously operated in the air is installed in the drain tank 20 that is a pit. A motor pump P may be installed. When the motor pump P that can be continuously operated in the air is installed in the barrel or the panel tank, the barrel or the panel tank has a smaller capacity than the pit, and the motor pump P starts and stops. From this point, it is preferable to use a pit having a large capacity as a sewage tank. However, if the purpose is to efficiently drain immediately and reduce the amount of residual sewage, an increase in the number of starts and stops is not necessarily a problem. A barrel or panel tank with a smaller bottom area than the pit is desirable from the viewpoint of immediate drainage and reduction of the amount of residual sewage. When installing a motor pump P, which is a submersible motor pump that can be continuously operated in the air, in a tank with a large bottom area such as a building pit, immediately take measures such as installing a pot (pump pit) or a pre-rotation tank in the tank. Effluent and residual sewage can be reduced efficiently. The pothole is a hole provided in a part of the bottom surface 20b where the motor pump P is installed, and the liquid in the tank finally flows into the pottery. In addition, it is good to provide a pre-rotation tank in the pot.

  Here, in the pump facility 500, when the area of the bottom surface of the drainage tank 20 is too large, sewage stays in the drainage tank 20 for a long time and bad odor becomes noticeable, the malodor prevention type drainage system 501 or 502 is proposed. The Specifically, as shown in the malodor prevention drainage 501 in FIG. 11 and the malodor prevention drainage 502 in FIG. 12, the drain tank 20 in FIG. 1 or 4 is a pit Pi that is a dry pit, and the pit Pi Inside, a small water tank (panel tank, barrel, etc.) is arranged as a liquid tank, and the motor pump P is arranged in the small water tank. Since the small water tank has a smaller bottom area than the pit Pi, it is possible to drain immediately by the motor pump P, reduce the amount of accumulated sewage, and prevent malodor.

FIG. 11 shows an embodiment using a pump system 10b as an example of a malodor-preventive drainage facility. In FIG. 11, a panel tank constituted by a plurality of panel members formed of resin or the like is a sewage tank 20-1, a sewage tank 20-1 is provided in the pit Pi, and a plurality of sewage tanks 20-1 are provided inside the sewage tank 20-1. Motor pumps P1 and P2 are installed. Moreover, in FIG. 12, embodiment using the pump system 10c is shown as another example of a malodor prevention type drainage facility. The pump system 10c includes motor pumps P1 and P2 including motors, and a control device 100 that controls the motor pumps P1 and P2. All the submersible motor pumps P installed in the sewage tank 20-2 are provided with a cooling mechanism that suppresses the saturation temperature during continuous operation in air to a predetermined abnormal temperature or less. A cylindrical water tank (barrel Brl-N, barrel Brl-N-1, barrel Brl-2, and barrel Brl-1) is disposed inside the pit Pi so as to communicate with each other, thereby being a liquid tank 20-2. Form. And it is preferable to install a plurality of motor pumps P in the sewage tank 20-2 and guide the sewage by adjusting the height so that the bottom of each barrel is lowered in the downstream direction. Here, at least one motor pump P is disposed in at least the most downstream barrel to prevent the sewage from staying in the sewage tank 20-2 for a long time. 11 and 12, two motor pumps (P1 and P2) are shown, but the present invention is not limited to this and may be one or three or more.

  The malodor prevention type drainage system 501 shown in FIG. 11 includes a sewage tank 20-1 (liquid tank) provided in the pit Pi and a pump system 10b. The pump system 10b includes a plurality of motor pumps P1 and P2 installed in the sewage tank 20-1, and a control device 100 that controls the motor pump P. A pit opening 15 is formed in the pit Pi, and a pit opening cover 16 (for example, a manhole cover) is preferably attached to the pit opening 15. And all the submersible motor pumps P installed in the sewage tank 20-1 which is a panel tank are provided with the cooling mechanism which suppresses the saturation temperature at the time of aerial continuous operation to below predetermined abnormal temperature.

  The sewage tank 20-1 is formed by connecting a plurality of panel members. As a whole, it has a substantially rectangular parallelepiped shape (box shape), and has an internal space defined by the bottom surface 20-1a, the side surface 20-1b, and the top surface 20-1c. Each panel member is preferably sized to be carried in from the opening 15 and can be assembled in the pit Pi. In the example of FIG. 11, the division | segmentation of the several panel member in the sewage tank 20-1 is shown with a dashed-dotted line. The sewage tank 20-1 may be formed of an arbitrary number of panel members. The plurality of panel members are made of, for example, resin or metal. Further, the panel member may be formed of a plurality of layers of materials, for example, a fiber reinforced plastic (FRP), a synthetic resin foam, and a synthetic resin exterior may be laminated.

  The sewage tank 20-1 has an opening 13 formed on the upper surface 20-1 c, and the opening 13 is covered with a lid 14. The opening 13 is formed above the motor pump P and has a size that allows the motor pump P to pass therethrough. Specifically, two motor pumps P1 and P2 may be installed in the sewage tank 20-1, and the opening 13 and the lid 14 may be provided corresponding to the positions of the motor pumps P, respectively. Then, for example, the motor pump P1 or P2 is installed in the sewage tank 20-1 or taken out from the sewage tank 20-1 by moving the motor pump P1 or P2 in the vertical direction using a hanging tool. Can do. That is, the motor pump P1 or P2 can be replaced and maintained without removing the sewage from the sewage tank 20-1. The inflow pipe 12 is piped into the sewage tank 20-1 from the basement B through the pit opening 15 and through the opening 13 of the sewage tank 20-1. In the sewage tank 20-1, an outlet pipe 21 is connected to each of the discharge ports of the two motor pumps P1 and P2, and is integrated outside the sewage tank 20-1 and in the pit Pi to be connected to the sewage 91 side. Is done.

12 is provided in the pit Pi, and includes a plurality of barrels Brl-1 to Brl-N for temporarily storing sewage from the basement portion B, and a pump system 10c. . The malodor prevention drainage 501 houses a plurality of motor pumps P1 and P2 in the barrel, and the motor pump P is controlled by the control device 100. Connecting pipes (30-1, 30-2, and 30N-) that connect a plurality of connected barrels (Brl-1, Br-2,..., Brl-N-1 and Brl-N) and the barrel. 1) forms the sewage tank 20-2, and the sewage tank 20-2 corresponds to the water tank 20 shown in FIG. Barrels Brl-1 to Brl-N are connected by communication pipes 30-1 to 30-N-1. In order to drain the sewage stored in the barrel Brl-1 to the outside, a motor pump P1 is installed inside the barrel. A motor pump P2 is installed in order to drain the sewage stored in the barrel Brl-2 to the outside. The motor pump P may be similarly installed in other barrels. A plurality of motor pumps P may be arranged in one barrel. A water level detector 40 is installed in each of the barrels Brl-1 and Brl-2 where the motor pumps P1 and P2 are installed, and detects the water level inside the barrel. Moreover, the water level detector 40 may be installed in any one of the barrels Brl-1 to Brl-N to detect the water level inside the barrel.

  The inflow pipe 12 is piped from the basement B to the pit Pi through the pit opening 15a. Sewage or the like is first piped to flow into the barrel Brl-N. The sewage or the like that has flowed into the barrel Brl-N sequentially flows out to the barrel in the downstream direction. The sewage in the sewage tank 20-2 is drained from the sewage tank 20-2 to the sewage tank 91 by the outflow pipe 21 connected to the discharge ports 222b of the motor pumps P1 and P2. In FIG. 12, although the pit openings 15a and 15b are provided separately, the number of pit openings may be one or three or more.

  By placing the barrels Brl-2 to Brl-N on the table, the bottom surface of the most downstream barrel Brl-1 may be adjusted to be lower than the other barrels. Thereby, sewage etc. can be effectively guided to the barrel Brl-1 on the downstream side. The height of the bottom surface of the barrel may be adjusted so as to decrease toward the downstream side.

The drain tank may be formed by combining the panel tank and the barrel. Specifically, for example, the panel tank and the barrel may be connected by the communication pipe 30-1. Also in this case, the panel tank and the barrel are arranged so that the height of the bottom surface becomes lower toward the downstream side, and at least one motor pump P may be arranged at least in the most downstream panel tank or barrel.

  The operation of the motor pump P described with reference to FIGS. 3 and 7 can also be applied to the malodor-preventing drainage systems 501 and 502 shown in FIGS. That is, the same effect can be obtained by applying the control device 100 and implementing the control of the motor pump P described with reference to FIGS. Can be obtained.

(Modification 1)
Next, a motor pump P provided with a pump attaching / detaching device 150 as shown in FIG. 13 will be described as a first modified example related to the pump system described above. FIG. 13 shows the configuration of the motor pump P and the pump attaching / detaching device 150. 13, in order to facilitate understanding, only the pump attaching / detaching device 150 and the motor pump P installed in the pump facility 500 are shown in an enlarged manner, and the description of the same configuration as that in FIG. 1 or FIG. 4 is omitted. A connecting pipe 110 for connecting the motor pump P and the outflow pipe 21 is attached to a predetermined position in the drain tank 20. In the connection pipe 110, a connection pipe line 112 attached to the base 113 is installed substantially horizontally, and an opening 112a on one end side (inflow side) is opened sideways. On the upper side surface of the opening 112 a of the connection pipe 112, a projection 115 is provided over the entire width of the connection pipe 112 at a right angle to the axial direction of the connection pipe 112. The cross-sectional shape of the protrusion 115 is a substantially trapezoid whose upper surface is horizontal. The connecting pipe 112 is bent upward in the vicinity of the end on the other end side (outflow side), the opening 112b on the outflow side is opened upward, and the tip is connected to the outflow pipe 21. Has been. The connecting pipe 110 may be formed integrally with the outflow pipe 21 as a part of the outflow pipe 21.

Furthermore, two guide pipes 111 and 111 (only one is shown) are attached to both sides of the connecting pipe 110 from the upper surface of the base 113 upward. By the guide pipes 111, 111, the operator does not enter the drain tank 20, and the motor pump P is moved to a predetermined position, that is, the opening 131 of the discharge pipe 130 of the motor pump P is connected to the connection pipe 110. It can be lowered. That is, the submersible motor pump P is configured to move up and down in the drainage tank 20 while being guided by the guide pipes 111 and 111.

  A discharge pipe 130 is attached to the discharge port 222b of the motor pump P. The discharge pipe 130 has an opening 131 on the discharge side that opens sideways. The discharge pipe 130 is provided with guide portions 132 and 132 (only one of which is shown) formed with guide holes 132a and 132a through which the guide pipes 111 and 111 are passed so as to protrude from the end surface on the opening 131 side.

  Further, an engaging portion 133 that is integrally formed with the guide portion 132 and that protrudes in a substantially horizontal direction from the upper end surface of the opening portion 131 of the discharge pipe 130 is provided. The engaging portion 133 is configured as a claw portion 133a whose front end protrudes downward. A groove 133b is formed between the claw 133a and the upper end surface of the opening 131. The width of the groove 133b is formed to be substantially the same as that of the protruding portion 115 so that the protruding portion 115 provided in the connecting pipe 112 is fitted.

  In order to install the motor pump P in the drain tank 20, the guide parts 132 and 132 of the discharge pipe 130 are passed through the guide pipes 111 and 111 and connected to the bowl-shaped rack 104 attached to the upper part of the motor pump P. With the chain 105, the motor pump P is suspended from the outside of the drain tank 20 vertically downward and lowered. At this time, the motor pump P descends in the drain 20 while being guided by the guide pipes 111 and 111. Then, when the motor pump P descends to the position of the connecting pipe 110, the projection 115 enters the groove 133b, and the side surface of the claw 133a and the side surface of the projection 115 come into contact with each other. At this time, the opening 112a of the connection pipe 112 and the opening 131 of the discharge pipe 130 are joined. Then, the moment of the motor pump P in the direction in which the motor pump P discharges to the opening 112a of the connection pipe 112 and presses the opening 131 of the pipe 130 with the contact point between the claw 133a and the contact 115 as a fulcrum due to its own weight. Act. Thereby, the junction part of the opening part 112a and the opening part 131 is press-contacted, it becomes a watertight state, and the state is hold | maintained. Thus, the installation of the motor pump P is completed. When the motor pump P is removed, the motor pump P is lifted vertically upward from the outside of the drain tank 20 by the chain 105 and raised.

  Since the motor pump P includes a cooling mechanism for cooling the motor unit 4 as described in the example with reference to FIG. 2, the weight increases by the cooling mechanism. As the weight is increased by the cooling mechanism, the moment in the direction in which the outlet 131 of the discharge pipe 130 is pressed against the opening 112a of the connecting pipe 112 is more intense, and the opening 112a and the opening 131 are joined. The part is more strongly watertight.

  A known pump attaching / detaching device may be used instead of the pump attaching / detaching device 150 shown in the present embodiment. Specifically, without entering the drain 20, the drain of the motor pump P is moved to a predetermined position, that is, until the opening 131 of the discharge pipe 130 of the motor pump P is connected to the connection pipe 110. It is only necessary that the motor pump P can be lowered from the outside and the motor pump P can be taken out of the drainage tank 20 from the predetermined position.

Here, by operating the motor pump P in a state where the joint portion with the connection pipe 110 is exposed to the air, the operator can leak water from the joint portion of the motor pump P to the outside of the drainage tank 20 (for example, drainage). It can be visually confirmed from the opening 16 at the top of the water tank 20 or the opening 13 of the sewage tank 20-1. Therefore, it is preferable that at least a part of a joint portion between the motor pump P and the connection pipe 110 (for example, a joint portion between the opening 112a and the opening 131) is above the stop water level HL of the motor pump P. The motor pump P capable of continuous operation in the air can be operated continuously in the air even when the joint between the motor pump P and the connecting pipe 110 is below the upper end of the motor unit 4 (that is, below the water level H1). Can check for water leakage at the joint. Further, the motor pump P capable of continuous operation in the air can keep the temperature of the motor unit 4 below the temperature at which the motor unit 4 fails even if the operator repeats the operation and stop of the motor pump P at an arbitrary timing. Therefore, the operator can confirm the presence or absence of water leakage from the joint portion in a short time.

  When a plurality of motor pumps P are installed in the drainage tub 20 as in the pump system 10b shown in FIG. The motor pump P can be attached and detached while continuing drainage with the motor pump P. In general, the maintenance of the motor pump P is performed in a time zone where the amount of sewage is small (for example, at midnight). When the motor pump P to be maintained is removed from the connection pipe 110, the liquid in the contact / outflow pipe 21 may flow backward and be discharged from the opening 112a. Since any motor pump P can be continuously operated in the air, even if a small amount of liquid is discharged from the outflow pipe 21, it can be immediately drained by the motor pump P remaining in the drain tank 20. it can. In addition, when a sudden increase in the amount of inflow is expected during maintenance, if the water level of the drainage tank 20 is higher than HL, the motor pump P can be continuously operated in the air. It can prevent becoming full.

  Further, when the liquid tank is a water tank provided on the ground, a sewage pit, a panel tank provided in the dry pit, or a barrel, the same effect can be obtained by installing the pump attaching / detaching device 150. It is done.

  Next, replacement of the motor pump P and the pump attaching / detaching device 150 will be described. As a reason for exchanging the motor pump P, a request for the motor pump P may be changed. That is, the performance required for the motor pump P may be different from the past time when the existing motor pump P is installed. For example, there are the following cases. 1) The amount of sewage drainage has decreased due to the declining birthrate. 2) Since the amount of sewage drained at a time has decreased due to diversification of life, we want to install multiple small pumps. 3) If a large amount of rainwater is mixed into sewage due to a guerrilla thunderstorm, etc., the pump's pumping capacity may be insufficient.

  For these reasons, when replacing the motor pump P of the existing pump system with the motor pump Pa, it may be desired to replace the motor pump P with one having a different performance. A general pump attachment / detachment device needs to be connected to a pump discharge pipe so as to be watertight. Further, in the above-described example, the motor pump P is attached to the pump attaching / detaching device 150 by a joint portion between the opening 112a and the opening 131, and is installed so as to float in the air. In the case of such an installation method, the attachment / detachment device for the pump needs to withstand the load of the pump. In view of these needs, the design of the detachable device for the pump is generally different in size, shape, and the like depending on the diameter of the pump.

  At this time, the following problems occur. The detachable device for the pump is fixed to the base with bolts (foundation bolts). As the size of the pump changes, the size of the detachable device changes accordingly. Since the size of the detachable device is changed, it is necessary to adjust the position of the foundation bolt on the base. Therefore, if the position of the mounting portion (that is, the position of the foundation bolt) of the mounting / demounting device is changed, the number of steps for the base work is increased and complicated.

Therefore, in the embodiment described below, a base plate to which a pump attaching / detaching device can be attached is used. Fix the replaceable foundation plate with foundation bolts to the base where the pump attachment / detachment device is installed. The pump attaching / detaching device is attached to the base plate by means such as a fixture (for example, a bolt and a nut). The attachment / detachment device may be attached to the base plate by welding or integral processing. The change in the mounting position of the pump attachment / detachment device on the base is absorbed by the change in the position of the fixture on the foundation plate. By using such a foundation plate, it is not necessary to change the position of the foundation bolt on the foundation side even if the attachment position of the attachment / detachment device to the foundation changes with the change in performance of the pump. The work for changing the mounting position of the foundation bolt on the base side involves waterproofing so that the sewage in the drainage tank 20 does not flow out of the foundation bolt mounting position and contaminate the outside. When it is not necessary to change the mounting position of the foundation bolt, the work process at the time of exchanging the pump attaching / detaching device is reduced as described below.

  It is easy to fix the foundation plate of this embodiment with a foundation bolt. Since the position of the foundation bolts on the foundation side does not change, no foundation work is required for changing the position of the foundation bolts. If the size of the pump changes and the size of the attachment / detachment device changes accordingly, the design of the foundation plate may be changed without changing the position of the foundation bolt on the base side. In other words, it is easier to fix the attachment / detachment device to the base with the foundation plate than to the civil engineering work of the foundation of the sewage tank, which requires strict waterproofing compared to fresh water.

  In addition, when the pump provided in the existing pump equipment is replaced, the following problems may occur. For example, if the replacement work is performed after stopping the inflow of sewage into the drainage tank, the entire building where the sewage tank is installed will be shut down. I want. Therefore, it is required to replace the pump in a short time with a small amount of discharged sewage such as midnight.

  In order to solve this problem, in the following pump replacement embodiment, an enclosure is installed around the existing pump equipment, and the pump replacement work is performed while continuing drainage with a pump different from the pump to be replaced. In this case, like the pump system 10a described above, all the submersible motor pumps P installed in the liquid tank include a cooling mechanism that suppresses the saturation temperature of the submersible motor pump P in the continuous air operation to an abnormal temperature or less. In the case of the motor pump P, drainage is possible continuously even at a water level where the motor unit 4 is exposed. Since the pump replacement work can be performed while the water level in the tank is kept low by the drainage of the motor pump P in the air continuous operation, the workability is improved.

  The basic plate will be described with reference to FIGS. FIG. 14 is a view showing a state in which the pump attaching / detaching device 150 is installed on the base 20b through the foundation plate 300. FIG. The replaceable foundation plate 300 is fixed to the base 20b on which the motor pump P is installed with the foundation bolts 302. In the present embodiment, a base 20b having a predetermined height H1 is provided on the bottom surface 20b of the drain tank 20. Since the motor pump P can be continuously operated in the air, the height HS of the suction port of the suction pipe 22 should be lower than H1 and drained as much as possible. Specifically, the foundation plate 300 is fixed to the receiving part 306 of the bottom surface 20b with the foundation bolt 302. The receiving portion 306 is a screw hole that engages with the foundation bolt 302 formed on the bottom surface 20b in order to fix the pump attaching / detaching device 150 before replacement. Moreover, the receiving part 306 is waterproofed so that dirty water does not leak. The pump attaching / detaching device 150 is attached to the base plate 300 with a fixture (for example, a bolt 304 and a nut (not shown)). In addition, it is good also considering a part of bottom face 20b of the drain tank 20 as the base 20b1.

FIG. 15 shows the structure of the base plate 300. 15A is a plan view of the base plate 300, FIG. 15B is a side view, and FIG. 15C is a front view. The base plate 300 has four holes 302 a for attaching the base bolts 302, and four holes 305 for attaching the replaced pump attaching / detaching device 150 to the base plate 300. The base plate 300 has a peripheral part 308, a side part 309, and a central part 310. In a state where the foundation plate 300 is installed on the base 20b1, the central portion 310 to which the pump attaching / detaching device 150 is attached is higher than the peripheral portion 308 attached to the base 20b1. The peripheral part 308 and the side part 309 are connected substantially orthogonally. Although the side part 309 and the center part 310 are also connected substantially orthogonally, it is not restricted to this shape, and the center part 310 should just be a shape higher than the periphery part 308 in the state installed in the base 20b1.

  The pump attaching / detaching device 150 is attached to the central portion 310 of the base plate 300. A hole 302 a is provided in the peripheral portion 308, and a hole 305 is provided in the central portion 310. The peripheral part 308 has two openings 312. When the pump attaching / detaching device 150 is attached to the base plate 300, a nut may be fixed to the bolt 304 by inserting a hand from the opening 312. The opening 312 may be any shape and number as long as the operator can access the bolt 304 by putting his hand. The hole 305 includes two elongated holes 305 b that are parallel to the left and right direction of the base plate 300 and two elongated holes 305 a that are perpendicular to the elongated hole 305 b of the foundation plate 300. Since the directions of the long holes 305a and 305b are orthogonal, the positioning of the pump attaching / detaching device 150 and the base plate 300 can be performed in both the left-right direction of the base plate 300 and the direction perpendicular to the left-right direction of the paper. It becomes easy and it can prevent that the base plate 300 shifts | deviates by the vibration of the motor pump P compared with the case where the direction of the elongate holes 305a and 305b is substantially parallel. By making the hole 305 into a long hole, the base plate 300 can correspond to the pump attachment / detachment devices 150 having different attachment positions.

  The material of the base plate 300 may be any material as long as it can withstand the load of the pump attaching / detaching device 150 and the motor pump P. For example, metal, plastic resin, wood, etc. can be used. In the case of using a metal such as stainless steel, the base plate 300 can be manufactured by processing a hole or an opening in one metal plate and then bending it.

  Another embodiment of the base plate will be described with reference to FIGS. FIG. 16 is a diagram showing a state in which the pump attaching / detaching device 150 is installed on the base 20b1 via the base plate 316. The replaceable base plate 316 is fixed to the bottom surface 20b of the drainage tank 20 where the motor pump P is installed with the base bolt 302. FIG. 17 shows the structure of the base plate 316. 17A is a plan view of the base plate 316, FIG. 17B is a side view, and FIG. 17C is a front view. A base plate 316 shown in FIG. 17 is obtained by providing an outer peripheral plate 314 on the outer periphery of the base plate 300 shown in FIG. In other respects, the base plate 316 has the same structure as the base plate 300.

  The outer peripheral plate 314 surrounds the outer periphery of the foundation plate 316 and prevents the liquid in the drainage tank 20 from entering the inner side of the outer peripheral plate 314. The outer peripheral plate 314 can be formed by being fixed to the peripheral portion 308 by welding or the like, or by bending a part of the peripheral portion 308. By providing the outer peripheral plate 314, it is possible to prevent the liquid in the drain 20 from entering the inside of the base plate 316 when the water level is low when the motor pump P is replaced. The work of fixing the foundation bolt 302 and the bolt 304 is facilitated.

  Another embodiment of the base plate will be described with reference to FIGS. In this embodiment, the foundation plate 330 includes a first foundation plate 318 on the pump attaching / detaching device 150 side and a second foundation plate 320 on the base 20b1 side. FIG. 18 is a view showing a state immediately before the pump attaching / detaching device 150 is installed on the base 20b1 via the foundation plate 330. FIG. After attaching the first foundation plate 318 to the pump attaching / detaching device 150, the pump attaching / detaching device 150 is attached to the second foundation plate 320. The pump attaching / detaching device 150 shows only the base 113 portion, and the other portions are not shown.

The first base plate 318 is attached to the pump attaching / detaching device 150 with bolts 304. The second foundation plate 320 is fixed to the bottom surface 20b with foundation bolts 302. After the first base plate 318 is fixed to the pump attaching / detaching device 150 and the second base plate 320 is fixed to the bottom surface 20b, the first base plate 318 is attached to the second base plate 320 by plate bolts (not shown). Fixed.

  The holes for the plate bolts are four holes 322 provided in the first base plate 318 and four holes 324 provided in the second base plate 320. After the positions of the holes 322 and 324 are aligned, plate bolts are inserted into the holes 322 and 324 to fix the base plate 318 and the base plate 320.

  FIG. 19 shows the structure of the first foundation plate 318. The first base plate 318 has a single plate shape, and includes four holes 305 for attaching the pump attaching / detaching device 150 to the first base plate 318, and 4 for attaching the first base plate 318 to the base plate 320. A number of holes 322 are provided.

  FIG. 20 shows the structure of the second base plate 320. 20A is a plan view of the second base plate 320, and FIG. 20B is a side view. The second foundation plate 320 has four holes 302 a for attaching the foundation bolts 302 and four holes 324 for attaching the first foundation plate 318 to the second foundation plate 320. The second base plate 320 has a peripheral part 308, a side part 309, and a central part 310. The central part 310 is higher than the peripheral part 308. The peripheral part 308 and the side part 309 are connected substantially orthogonally. The side part 309 and the central part 310 are also connected substantially orthogonally. The second base plate 320 includes two base plates, that is, a third base plate 320a and a fourth base plate 320b.

  Advantages of this embodiment include the following. Since the first base plate 318 can be attached to the pump attaching / detaching device 150 on the ground, this operation is easy. The holes 322 and 324 for attaching the first foundation plate 318 and the second foundation plate 320 are provided on the outermost sides of the first foundation plate 318 and the second foundation plate 320, so that the operator can enter these holes. Easy access to work. Further, since it is easy to increase the positional accuracy of the hole 322 on the first base plate 318, the position of the hole 322 on the first base plate 318 is set to the position of the hole 324 on the second base plate 320. Can be processed well together. As a result, the first base plate 318 and the second base plate 320 can be easily aligned on the work site, and the on-site alignment operation is facilitated. Thus, the working time in the drainage tank 20 can be shortened by using the foundation plate 330.

  As described above, the base plate may be either a single plate or a plurality of plates. In the case of a plurality of plates, the foundation plate can have components that can be attached to the pump attachment / detachment device and components that can be attached to the base 20b1. This example is a base plate 330 composed of a first base plate 318 and a second base plate 320 in FIG. In FIG. 18, the foundation plate 330 is divided into the first foundation plate 318 on the base 20b1 side and the second foundation plate 320 on the pump side, and the first foundation plate on the pump side is divided into the second foundation plate 320 on the foundation 20b1 side. 318 is fixed with a fixture. Moreover, the base plate mentioned above can have several components which can be independently attached to the base 20b1. This example is the two third base plates 320a and the fourth base plate 320b of FIG. The base plate can also have a plurality of parts that can be independently attached to three or more bases 20b1. Note that the fixtures that fix the foundation plates 300, 316, 330 and the pump attaching / detaching device 150 or the base 20b1 may be fixtures other than bolts and nuts. Further, a cushioning material such as earthquake-resistant rubber that absorbs vibrations of the pump may be provided between the base plates 300, 316, 330 and the pump attaching / detaching device 150 or the base 20b1.

Next, replacement work of the motor pump P and the pump attaching / detaching device 150 using the base plate 300 will be described with reference to FIGS. 21 to 28 show the state of the pump equipment 500 and the like at each step of the replacement work, and FIG. 29 shows the overall flow of the replacement work of the pump attaching / detaching device 150 in the motor pump P1. In the present embodiment, as an example, a motor pump P including a pump attaching / detaching device 150 as illustrated in FIG. 13 in a pump facility 500 using the pump system 10a illustrated in FIG. 4 will be described. FIG. 21 shows an outline of the pump equipment before replacement. The two motor pumps P <b> 1 and P <b> 2 are fixed to the pump attaching / detaching device 150 by the weight of the pump and are hung on the pump attaching / detaching device 150. The motor pumps P1 and P2 are submersible pumps that can be operated in continuous air. Therefore, the motor pump P can be continuously operated in the air during the replacement work performed in a time zone where the amount of sewage is low, such as at midnight. Since the motor pump P in the drain tank 20 drains the liquid that has flowed into the drain tank 20 during the replacement operation by continuous operation in the air, and the rise of the water level can be suppressed, the height of the shroud 326 described later is low. That's it.

  The pump attaching / detaching device 150 is fixed to a foundation portion of the bottom surface 20b of the sewage tank by a foundation bolt 302. By using the pre-rotation tank 60 and the suction pipe 22, the stop water level HL can be lowered from the foundation bolt 302. As shown in FIGS. 21 to 28, if the suction pipe 22 is located lower than the foundation bolt 302 of the pump attaching / detaching device 150, the pump attaching / detaching device 150 can be easily replaced.

  Next, referring to FIG. 22, preparation work for replacement of the motor pump P1 and the pump attaching / detaching device 150 will be described. In addition, it is desirable to perform the exchange work in a time zone when the amount of sewage flowing into the sewage tank is small. As a preparatory work for the replacement work in step S500 shown in FIG. 29, the motor pumps P1 and P2 are activated, and the sewage is discharged until the water level WL in the sewage tank 20 becomes the stop water level HL. After activation, the control device 100 monitors the water level with the water level detector 40, and if the water level WL is higher than the stop water level HL (when “NO” in step S510), the control device 100 continues draining in step S510. When the water level WL becomes equal to or lower than the stop water level HL (“YES” in step S510), the drainage is stopped and the process proceeds to step S520.

  Next, an operation after the water level WL in the sewage tank 20 becomes the stop water level HL will be described with reference to FIG. An operator surrounds the existing motor pump P1 to be replaced first among the motor pumps P1 and P2 to be replaced with a surrounding plate 326 that prevents the foundation bolt 302 from being submerged in the liquid in the drain tank 20 (see FIG. 29 step S520). Surrounding the motor pump P1 and the pump attachment / detachment device 150 of the motor pump P1 with a veneer material (enclosure plate 326). The height of the surrounding plate 326 may be higher than the base bolt 302 of the pump attaching / detaching device 150 and may have a shape that can prevent the base bolt 302 from being immersed in the liquid in the drainage tank 20 during the replacement work of the motor pump P1. The enclosure plate 326 may be made of metal or plastic resin. Further, the enclosure plate 326 may be reinforced by another member or supported by another member. The enclosure plate 326 has a cylindrical shape or a rectangular shape that is open at the top and bottom so that an operator can replace the pump attaching / detaching device 150 inside the enclosure plate 326, and a plurality of plates carried into the sewage tank 20. It may be assembled.

Next, an operation after the enclosure by the enclosure plate 326 is completed will be described with reference to FIG. The motor pump P1 surrounded by the enclosure plate 326 drains the inside of the enclosure plate 326 of the motor pump P1 to expose the foundation bolt 302 from the sewage (step S530 in FIG. 29). This operation is because the operator cannot tighten the foundation bolt when the foundation bolt 302 is in the liquid. However, when the water level in the shroud 326 of the motor pump P1 is lower than the foundation bolt, this draining work is not necessary. In step S530 shown in FIG. 29, after the motor pump P1 is activated, the control device 100 monitors the water level with the water level detector 40, and if the water level in the shroud 326 is higher than the stop water level HL (in step S540, “ If NO, continue draining in step S540. When the water level in the shroud 326 becomes equal to or lower than the stop water level HL (“YES” in step S540), the drainage is stopped and the process proceeds to step S550.
Note that the operator may determine whether the water level in the shroud 326 in step S530 is equal to or lower than the stop water level HL.

  At this time, when the water level in the sewage tank 20 is equal to or higher than the stop water level HL, the motor pump P2 that is not enclosed is activated to drain the sewage tank 20 and prevent the water level from rising from the shroud 326. Good. In the present embodiment, since the motor pumps P1 and P2 are pumps that can be continuously operated in a gas, the water can be continuously discharged at a low water level at which the motor pumps P1 and P2 are exposed. For this reason, the rise in the water level in the drain tank 20 can be suppressed, and the replacement work is facilitated. Moreover, since the motor pump P1 can be restarted without performing a cooling period after performing the continuous operation in the air in FIG. 22, the working time can be shortened.

  Next, with reference to FIG. 25, the operation after the drainage inside the enclosure plate 326 of the motor pump P1 is completed will be described. At this stage, the motor pump P1 is carried out of the tank (step S550 in FIG. 29). Specifically, an operator outside the sewage tank 20 carries the motor pump P1 out of the sewage tank 20 through the opening 16 using the pump attaching / detaching device 150 for the motor pump P1. At this time, since the motor pump P2 can be operated if the water level in the sewage tank 20 is equal to or higher than the stop water level HL, the water level in the sewage tank 20 can be prevented from becoming higher than the enclosure plate 326.

  Next, the operation after the motor pump P1 is carried out of the tank will be described with reference to FIG. At this stage, replacement work of the pump attaching / detaching device 150 for the motor pump P1 is performed. First, the foundation bolt 302 of the pump attaching / detaching device 150 for the motor pump P1 carried out of the sewage tank 20 by an operator in the sewage tank 20 is removed, and the pump is attached / detached by a crane or the like provided on the opening 16. The apparatus 150 is carried out of the sewage tank 20 (step S560 in FIG. 29). Next, the worker in the sewage tank 20 fixes the foundation plate 300 for the pump attaching / detaching device 150a for the new motor pump P1a to the foundation portion of the bottom surface 20b with the foundation bolt 302 (step S570 in FIG. 29).

  FIG. 26 shows a state in which the base plate 300 is fixed to the base portion of the bottom surface 20 b by the base bolt 302. Since the motor pump P2 can drain water if the water level in the sewage tank 20 is equal to or higher than the stop water level HL, the water level in the sewage tank 20 can be prevented from becoming higher than the enclosure plate 326. Moreover, the height of the surrounding board 326 may be low by the continuous operation in the air of the motor pump P2. Thereby, for example, when the foundation bolt 302 is at the operator's foot, the workability of step S560 and step S570 is improved.

  Next, an operation after the foundation plate 300 is fixed to the bottom surface 20b by the foundation bolt 302 will be described with reference to FIG. At this stage, the pump attaching / detaching device 150a for the motor pump P1a is installed (step S580 in FIG. 29). Specifically, a new pump attaching / detaching device 150 a is fixed to the foundation plate 300 by an operator in the sewage tank 20. Next, the worker outside the sewage tank 20 installs a new motor pump P1a in the sewage tank 20 using the installed pump attaching / detaching device 150a (step S590 in FIG. 29). Here, when the discharge port diameters of the motor pump P1 and the motor pump P1a are different from each other, different diameter pipe joints (one end has a discharge port diameter of the motor pump P1a and the other end has a discharge port diameter of the motor pump P1). The existing outflow pipe 21 and the connection pipe 110 of the pump attaching / detaching device 150a may be connected via an unillustrated). At this time, if the water level in the sewage tank 20 is equal to or higher than the stop water level HL, the motor pump P2 continues operation and drains. The base plate 300 may be either the base plate 316 or the base plate 330.

Next, the operation after the new motor pump P1a is installed will be described with reference to FIG. At this stage, the worker in the sewage tank 20 removes the surrounding plate 326 around the new motor pump P1a (step S600). Thereby, the motor pump P1
And the replacement work of the motor pump P1a is completed. When the replacement work of the motor pump P2 is performed, the same work as the replacement work of the motor pump P1 described in FIGS.

  As described above, the use of the surrounding plate 326 and the base plate 300 can shorten the water shut-off time during replacement work when the motor pump Pa and the attachment / detachment device 150a have different sizes. Furthermore, in this embodiment, since the motor pumps P1 and P2 are submersible motor pumps that can be operated in the continuous air, during the replacement work of the motor pump P1, the motor pump P2 has a water level in the sewage tank 20 that is equal to or higher than the stop water level HL. Thus, drainage can be continued and the water level in the drainage tank 20 can be kept at a low water level. Therefore, the height of the surrounding plate 326 can be suppressed as compared with the submersible motor pump in which continuous air operation is restricted. By suppressing the height of the surrounding plate 326, for example, the operator can perform the attaching work of the foundation bolt 302 from outside the surrounding plate 326. If the worker can work outside the shroud 326, the shroud 326 can be made smaller, and the workability of transportation and installation of the shroud 326 is improved.

  As mentioned above, although the example of embodiment of this invention has been demonstrated, above-described embodiment of this invention is for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention naturally includes equivalents thereof. In addition, any combination or omission of each constituent element described in the claims and the specification is possible within a range where at least a part of the above-described problems can be solved or a range where at least a part of the effect is achieved. It is.

P, P1, P2 ... Motor pump 10, 10a, 10b, 10c, 10d ... Pump system 12 ... Inflow pipe 20, 20X, 20Y ... Drainage tank 21 ... Outflow pipe 22 ... Suction pipe 40 ... Water level detector 60 ... Pre-rotation tank 100 ... Control device 1000 ... Building

Claims (13)

A pump system having at least one submersible motor pump installed in the liquid tank in order to discharge the liquid from a liquid tank capable of containing liquid,
The pump system
All of the submersible motor pumps installed in the liquid tank include a cooling mechanism that suppresses the temperature of the submersible motor pump in a continuous air operation to a predetermined temperature or less.
A pump system characterized by that. The liquid tank is a sewage tank for storing sewage and miscellaneous wastewater generated from buildings and other facilities,
The submersible motor pump discharges the liquid flowing into and stored in the sewage tank,
The pump system
2. The pump system according to claim 1, wherein the submersible motor pump activated under a predetermined start condition can be continuously operated in the air until the water level in the sewage tank becomes lower than the stop water level.   The pump system according to claim 1, wherein the liquid tank is a panel tank or a barrel provided in a dry pit in a basement of a building.   The pump system according to any one of claims 1 to 3, further comprising a pump attachment / detachment device for attaching / detaching a discharge pipe of the submersible motor pump to a connection pipe installed in the liquid tank.   The pump system according to claim 1, wherein the liquid is sewage. The pump system according to any one of claims 1 to 5, wherein the submersible motor pump can be activated at predetermined time intervals. 7. The pump system according to claim 6, wherein the length of the predetermined time interval can be set according to a change in ambient temperature.   The pump system according to claim 6 or 7, wherein the length of the predetermined time interval can be set according to the amount of liquid flowing into the liquid tank.   The pump system according to claim 1, wherein the submersible motor pump has a suction pipe extending below the submersible motor pump.   10. The submersible motor pump according to claim 1, wherein the submersible motor pump includes a plurality of the submersible motor pumps, and the number of the submersible motor pumps to be operated varies depending on the amount of the liquid accumulated in the liquid tank. The pump system described.   10. The apparatus according to claim 1, wherein the submersible motor pump includes a plurality of the submersible motor pumps, and the number of the submersible motor pumps to be operated varies depending on an amount of the liquid flowing into the liquid tank. Pump system.   A malodor-preventing drainage system using the pump system according to any one of claims 1 to 11. In order to discharge the liquid from the liquid tank capable of storing the liquid, the liquid tank has at least two submersible motor pumps installed in the liquid tank, and the submersible motor pump is the submersible motor pump in continuous air operation. A pump replacement method for a pump system including a cooling mechanism that suppresses the temperature of the temperature below a predetermined temperature,
Discharging the liquid using at least one of the submersible motor pumps and exposing a fixture to the base of the submersible motor pump to be replaced among the submersible motor pumps;
Carrying out the submersible motor pump to be exchanged out of the liquid tank;
And a step of carrying a submersible motor pump, which is an alternative to the submersible motor pump to be replaced, into the liquid tank.

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