JP6588260B2 - Pump and pump machine equipped with the same - Google Patents

Description

  The present invention relates to a pump station and a pump station that pumps water such as a drain station including the pump, and more particularly to a pump and a pump station that can continue operation even when an electric motor is flooded due to a tsunami or storm surge.

  In a sewage pump facility and a drainage pump facility (flood control), a vertical shaft pump having a relatively large capacity and a diameter exceeding 500 mm is installed. An electric motor is mainly used as a driving machine for driving the vertical shaft pump.

  FIG. 5 is a schematic view showing a conventional vertical shaft pump. As illustrated, the vertical shaft pump 100 includes an electric motor 101 provided above a foundation floor 110 on which the vertical shaft pump 100 is installed, a rotating shaft 102 rotated by the electric motor 101, and an impeller provided at a lower end of the rotating shaft 102. 103. The rotating shaft 102 extends vertically downward from the driving machine 101 toward a huge suction water tank 111 provided under the foundation floor 110.

  The vertical pump 100 further includes a substantially cylindrical suspension pipe 105, a curved pipe 104 connected to the upper end of the suspension pipe 105, a pump bowl 106 provided at the lower end of the suspension pipe 105, and a pump bowl. And a suction bell mouth 107 provided on the lower end side of 106. The electric motor 101 is located above the curved pipe 104. For this reason, the rotating shaft 102 is connected to the electric motor 101 through an opening provided in the curved pipe 104. A space between the opening and the rotating shaft 102 is sealed so that water in the bent tube 104 does not leak.

  In recent years, due to tsunamis caused by earthquakes, storm surges caused by huge typhoons, etc., it has become increasingly difficult to use equipment such as pumps submerged in ordinary pump stations. Therefore, there is a demand for a pump facility that can continue operation even in the event of a disaster such as a tsunami caused by an earthquake or a storm surge caused by a huge typhoon.

  By the way, in order to enable continuous operation even when water enters the pump station due to a tsunami or storm surge, a vertical pump using a water-resistant electric motor used for a submersible pump as a vertical pump drive has been proposed. (See Patent Document 1). In this vertical shaft pump, the electric motor is cooled by the handling fluid of the pump.

  FIG. 6 is a schematic diagram illustrating the flow of fluid in a conventional vertical shaft pump described in Patent Document 1. As shown in the figure, the curved pipe 121 of the vertical shaft pump has an opening at a position above the vertical direction, and a cylindrical motor mounting portion 122 to which the water resistant motor 120 is mounted is formed in this opening. A water resistant motor 120 is attached to the motor attachment portion 122 so as to cover the opening in a watertight manner. A space between the bent pipe 121 and the water resistant motor 120 is partitioned by a heat exchanger 123. The pumped water assembled by the vertical shaft pump contacts the heat exchanger 123, the heat of the water-resistant motor 120 is transmitted to the pumped water, and the water-resistant motor 120 is cooled. The output shaft 124 of the water resistant motor 120 is integrally connected to the main shaft 126 by a shaft coupling 125. However, such a vertical shaft pump has several problems described below.

JP2013-83242A

  First, in the flow of water by a vertical shaft pump, normally, water pumped from a lower impeller is smoothly discharged in a horizontal direction by a curved pipe and discharged. However, in the structure disclosed in Patent Document 1, a stagnation portion in which the flow stagnates is generated as in the flow F1 indicated by the broken-line arrow in FIG. In other words, the occurrence of the stagnation part means that the flow that was originally flowing smoothly by the curved pipe does not flow smoothly by the stagnation part. Accordingly, the pump efficiency is reduced, and a larger electric motor may be required to secure the necessary head and flow rate.

  Secondly, the fluid that has been heat exchanged in contact with the heat exchanger 123 is not properly discharged from the stagnation part, which causes a structural problem that cooling efficiency is poor. In particular, since the stagnation part is located in the upper part of the fluid flow path, heat tends to stay in the upper part, and there is a disadvantage that heat exchange efficiency is deteriorated unless forced fluid movement is performed.

  Furthermore, when this vertical shaft pump is a pump that handles fluid containing dust, such as a sewage pump, the fluid containing dust contacts the heat exchanger 123. As described above, since a stagnation portion is generated in the vicinity of the heat exchanger 123, there is a possibility that dust may get entangled with fins and the like of the heat exchanger 123. In this case, heat exchange cannot be performed, and there is a possibility that the vertical shaft pump may malfunction. In particular, a substance having a specific gravity smaller than that of water or dust such as cloth is caught in a high-speed fluid flow, sucked into a vertical pump, and floats and stays in a stagnation portion where the flow velocity is reduced. When this dust is accumulated, a situation occurs in which heat exchange is not performed.

  Thirdly, since the water-resistant motor 120 is directly installed in the pump casing (curved pipe 121), a bearing that receives the weight of the rotating body including the impeller and the fluid thrust force during pump operation cannot be provided on the vertical pump side. . For this reason, the water-resistant motor 120 needs to be designed so that these loads can be received. Therefore, the design of the water resistant motor 120 is special, which increases the cost and the delivery time. Moreover, since the water-resistant motor 120 is a custom-made product, there is a problem that it becomes difficult to supply a substitute product in the event of a failure.

  Fourth, in the vertical shaft pump described in Patent Document 1, as shown in FIG. 6, the main shaft 126 and the output shaft 124 of the water resistant motor 120 are directly connected by a shaft coupling 125. However, in the system in which these shafts are directly connected, high accuracy is required for positioning, assembling, and joining of the main shaft 126 and the output shaft 124 in the pumping station, so that connection work is difficult. For this reason, in order to adjust the positional relationship between the main shaft 126 and the output shaft 124, it is necessary to bring these shafts into a coupled state in advance at the manufacturing factory and carry them out to the pump station. However, since the production place (factory) of the water-resistant motor 120 and the vertical shaft pump is different, it is necessary to collect the water-resistant motor 120 and the main shaft 126 in any factory in order to perform the joining assembly of the water-resistant motor 120 and the main shaft 126. is there. Therefore, the efficiency of the connecting operation of these shafts is deteriorated.

  In addition, the maintenance cycle of the electric motor and the maintenance cycle of the vertical shaft pump do not always coincide. For this reason, for example, when maintaining a motor that has a shorter maintenance cycle than a vertical shaft pump, such as deterioration of the winding of the motor, the motor is generally removed locally from the vertical pump and only the motor is carried out. . However, with the vertical pump described in Patent Document 1, it is difficult to divide and carry out the water-resistant motor 120, and there is a problem that it is necessary to carry it out together with the vertical pump main body that does not require maintenance.

Therefore, during both the initial installation and the maintenance of the vertical pump, the water-proof motor 120 and the vertical pump main body are assembled (coupled) and loaded and installed. For this reason, in order to lift the water-resistant motor 120 and the vertical shaft pump body, a high-performance crane is required. Further, since the pumping station building requires a lifting height for the waterproof motor 120 and the vertical shaft pump body, the height of the building must be designed to be high.

  Fifth, since the water-resistant motor 120 is cooled using only the liquid handled by the vertical shaft pump (pumped water), the water-resistant motor 120 is cooled in the stand-by type vertical pump that performs the idle operation without pumping water. I can't.

  The present invention has been made in view of the above problems, and one of its purposes is to cool an electric motor without adversely affecting pump efficiency.

  Another object of the present invention is to cool an electric motor while suppressing a decrease in cooling efficiency associated with the operation of the pump.

  Another object of the present invention is to appropriately support the load and fluid thrust force of the rotating body during the pump operation with a thrust bearing.

  Another object of the present invention is to facilitate assembly and installation of the electric motor and the vertical shaft pump.

  Another object of the present invention is to cool the electric motor even during the preliminary standby operation.

  The present invention solves at least one of the above objects.

  According to one aspect of the present invention, a pump for pumping pumped water is provided. This pump has a main shaft to which an impeller is attached on one end side, a pump casing that surrounds at least a part of the main shaft, and a drive shaft that is connected to the other end side of the main shaft, and is disposed outside the pump casing. A water resistant motor, a cooling box configured to cool the water resistant motor by transferring heat of the water resistant motor to the pumped water, and a cooling water supply configured to supply the pumped water into the cooling box A pipe and a discharge pipe configured to discharge the pumped water supplied into the cooling box. According to this embodiment, the pumped water pumped up by the pump can be supplied to the cooling box through the cooling water supply pipe to cool the water-resistant motor. Therefore, since the stagnation part does not occur in the pump, the water-resistant motor can be cooled without adversely affecting the pump efficiency.

  According to the present invention, in one form of the pump, the water-resistant motor has a heat radiating portion for releasing heat generated from the water-resistant motor to the outside, and the heat radiating portion is disposed inside the cooling box. And configured to transfer the heat to the pumped water in contact with the pumped water supplied to the cooling box. According to this form, since a heat radiating part is arrange | positioned in a cooling box and pumping water contacts a heat radiating part, a water-resistant electric motor can be cooled more efficiently.

  According to the present invention, in one form of the pump, the pump includes a thrust bearing for supporting the weight of the main shaft and the impeller and a fluid thrust force. According to this embodiment, since the thrust bearing supports the force applied in the axial direction of the main shaft, it is not necessary to obtain a design for supporting the load on the electric motor. Therefore, it is not necessary to make the design of the water-resistant motor special, and it is possible to prevent an increase in cost and an increase in delivery time. Moreover, since it is not necessary to make a water-resistant motor as a custom-made product, an alternative product can be easily supplied in the event of a failure.

According to the present invention, in one form of the pump, the pump includes a joint configured to connect the other end side of the main shaft and the drive shaft with a deformation tolerance in the vertical direction and the horizontal direction. Have. According to this embodiment, it is possible to easily couple / separate the drive shaft and the main shaft at the site without high accuracy in positioning, assembly, and installation.

  According to the present invention, in one form of the pump, the pump has a makeup water pipe configured to supply water into the cooling box, and the cooling water supply pipe and the makeup water pipe are valves that can be opened and closed. Have According to this embodiment, there is no pumping water in the pump casing, and water can be supplied to the cooling box even when the pump is operating in the air. In addition, when the pump is pumping up by opening and closing the valves of the cooling water supply pipe and the makeup water pipe, the pumping water is supplied to the cooling box via the cooling water supply pipe, and the pump is operating in the air. Water can be supplied to the cooling box from the makeup water pipe.

  According to the present invention, in one form of the pump, the cooling box has a removable cover. According to this embodiment, the inside of the cooling box can be easily maintained by removing the cover.

  According to one aspect of the invention, a pump station is provided. The pump station includes a pump, a foundation floor for installing the pump, a suction water tank for storing liquid pumped by the pump, and a water discharge tank for storing liquid pumped by the pump And having.

  According to the present invention, in one form of the pump station, the cooling water supply pipe has one end connected to the cooling box, the other end connected to a discharge pipe of the pump casing or the water discharge tank, and the discharge pipe. One end is connected to the cooling box, and the other end is connected to the discharge pipe, the suction water tank, or the water discharge tank of the pump casing.

  According to one aspect of the present invention, the electric motor can be cooled without adversely affecting the pump efficiency.

  According to one aspect of the present invention, the electric motor can be cooled while suppressing a decrease in cooling efficiency associated with the operation of the pump.

  According to one aspect of the present invention, the load of the rotating body and the fluid thrust force during the pump operation can be appropriately supported by the thrust bearing.

  According to one aspect of the present invention, assembly and installation of the electric motor and the vertical shaft pump can be facilitated.

  According to one aspect of the present invention, the electric motor can be cooled even during the preceding standby operation.

It is the schematic which shows the vertical shaft pump and pump station which concern on this embodiment. It is the schematic which shows the example which connected the cooling water supply pipe | tube to another position. It is the schematic which shows the example which connected the cooling water supply pipe | tube to another position. It is an enlarged view of a cooling box. It is the schematic which shows the conventional vertical shaft pump. It is the schematic explaining the flow of the fluid in the conventional vertical shaft pump.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings described below, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted. In the embodiment described below, a vertical shaft pump is described as an example of the pump of the present invention.

  FIG. 1 is a schematic view showing a vertical shaft pump and a pump station according to the present embodiment. The pump station 50 according to the present embodiment includes a vertical pump 10, a foundation floor 51 for installing the vertical pump 10, a suction water tank 52 for storing liquid (such as water) pumped by the vertical pump 10, A water discharge tank 53 for storing the liquid pumped by the vertical shaft pump 10.

  The vertical shaft pump 10 includes an electric motor 11 provided above the foundation floor 51, a rotating shaft 12 (corresponding to an example of a main shaft) rotated by the electric motor 11, an impeller 13 provided on one end side of the rotating shaft 12, A pump casing 20 surrounding at least a part of the rotating shaft 12. The rotating shaft 12 extends vertically downward from the electric motor 11 toward a huge suction water tank 52 provided below the foundation floor 51. On the foundation floor 51, an electric motor mount 14 for installing the electric motor 11 is provided.

  The pump casing 20 has a suction hole at the lower end, and connects a suspension pipe 21 extending in a substantially vertical direction, a discharge pipe 22 extending in a substantially horizontal direction, and the suspension pipe 21 and the discharge pipe 22. And a curved pipe 23. One end of the bent tube 23 is connected to the upper end of the suspension tube 21, and the other end is connected to the discharge tube 22. The suspension pipe 21 has a pump bowl 17 provided at the lower end portion thereof, and a suction bell mouth 18 provided at the lower end side of the pump bowl 17. The pump bowl 17 and the suction bell mouth 18 accommodate the impeller 13.

  The electric motor 11 is disposed outside the pump casing 20. Specifically, the electric motor 11 is installed on the electric motor base 14 and is located above the curved pipe 23. For this reason, the rotating shaft 12 is connected to the electric motor 11 through an opening provided in the curved pipe 23. The gap between the opening and the rotary shaft 12 is sealed so that water in the bent tube 23 does not leak.

  The outer casing of the electric motor 11 is covered with a motor casing 11a, and an output shaft 11b extends from the lower surface of the motor casing 11a. The motor casing 11a is filled with air and is kept airtight. That is, the electric motor 11 is a water-resistant electric motor that is sealed so that water does not enter the motor casing 11a. In addition, a cooling jacket 11c through which a cooling medium for cooling the electric motor 11 flows is closely attached to the outside of the motor casing 11a. That is, the electric motor 11 is also an internal circulation type electric motor. The cooling medium in the cooling jacket 11c is circulated by a circulation means (not shown) provided in the cooling jacket 11c, for example.

  On the lower surface of the motor casing 11a of the electric motor 11, a heat exchanging portion 11d (corresponding to an example of a heat radiating portion) for releasing heat generated from the electric motor 11 to the outside is provided. In addition, a cooling box 30 configured to transmit the heat of the electric motor 11 to the pumped water and cool the electric motor 11 is provided below the electric motor 11. The cooling box 30 is attached in close contact with the motor casing 11a of the electric motor 11 so that the heat exchanging portion 11d of the electric motor 11 is disposed therein. The inside of the cooling box 30 is a cavity, and the output shaft 11b of the electric motor 11 is configured to penetrate the cavity in the vertical direction. As will be described later, pumping water or water supplied into the cooling box 30 comes into contact with the heat exchanging portion 11d of the electric motor 11, so that the cooling medium in the electric motor 11 and the cooling jacket 11c passes through the heat exchanging portion 11d. Is cooled. Therefore, the space between the output shaft 11b of the electric motor 11 and the cooling box 30 is appropriately sealed, and the pumped water or water in the cooling box 30 is prevented from leaking to the outside.

The cooling box 30 is installed on the top of the motor mount 14 in a state of being coupled to the motor 11. The cooling box 30 may be directly supported by the electric motor 11 installed on the electric motor mount 14. The electric motor mount 14 has a maintenance inlet (not shown) and a space 14a therein so that an operator can contact the output shaft 11b during maintenance or the like.

  The top of the motor mount 14 is located higher than the curved pipe 23 and is separated from the curved pipe 23. The output shaft 11b of the electric motor 11 is connected to the rotary shaft 12 by a joint 16 so as to be coupled / separated. The joint 16 is preferably a flexible joint or a universal joint, for example, configured to be able to connect the rotating shaft 12 and the output shaft 11b with deformation tolerance in the vertical direction and the horizontal direction. Since the joint 16 is a flexible joint or a universal joint, they can be easily coupled / separated without high accuracy in positioning, assembly, and installation of the output shaft 11b and the rotary shaft 12 in the field. .

  Moreover, it is preferable that the vertical shaft pump 10 has the thrust bearing 15 which supports the load of the rotating shaft 12 and the impeller 13, and the fluid thrust force at the time of pump operation | movement inside the curved pipe 23 like the example of illustration. Therefore, it is possible to separate the electric motor 11 from the vertical shaft pump 10 in the thrust bearing 15. Further, since the thrust bearing 15 supports the force applied in the axial direction of the rotary shaft 12, it is not necessary to obtain a design for supporting the load on the electric motor 11. Therefore, it is not necessary to make the design of the electric motor 11 special, and it is possible to prevent an increase in cost and a prolonged delivery date. Moreover, since the electric motor 11 is no longer a custom-made product, it is possible to easily supply an alternative product in the event of a failure.

  Further, as described above, since the motor mount 14 has a maintenance inlet (not shown) and has a space 14a therein, the joint 16 is connected between the bent tube 23 and the top of the motor mount 14. Can be arranged. Further, since the worker can enter the space 14a, the worker can easily come into contact with the thrust bearing 15 provided in the curved pipe 23. Therefore, the output shaft 11b and the rotary shaft 12 can be easily disassembled and assembled, and the thrust bearing 15 can be easily replaced.

  The discharge pipe 22 of the vertical shaft pump 10 has a discharge valve 22 a for opening and closing the discharge pipe 22. Further, the discharge pipe 22 is provided with a cooling water supply pipe 24 configured to supply a part of the pumped water into the cooling box 30. Specifically, the cooling water supply pipe 24 has one end connected to the cooling box 30 and the other end connected to the discharge pipe 22. The diameter of the cooling water supply pipe 24 is much smaller than that of the discharge pipe 22. When the vertical pump 10 pumps up the pumped water from the suction water tank 52, the pumped water is supplied into the cooling box 30 through the cooling water supply pipe 24. The pumped water supplied into the cooling box 30 contacts the heat exchanging part 11d, and the heat of the electric motor 11 is transmitted to the pumped water.

  The cooling water supply pipe 24 has a valve 24 a for opening and closing the cooling water supply pipe 24. By closing the valve 24a, the supply of pumped water into the cooling box 30 can be stopped. The cooling water supply pipe 24 may be connected to other parts of the pump casing 20 such as the curved pipe 23 instead of the discharge pipe 22. The cooling water supply pipe 24 may also be used as an air vent pipe of the vertical shaft pump 10.

The cooling box 30 has a discharge pipe 25 configured to discharge the pumped water supplied into the cooling box 30. Specifically, the discharge pipe 25 has one end connected to the cooling box 30 and the other end connected to the suction water tank 52. The pumped water that has exchanged heat with the heat exchange unit 11 d in the cooling box 30 is returned to the suction water tank 52 through the discharge pipe 25. The discharge pipe 25 may be connected to the water discharge tank 53 or the discharge pipe 22 instead of the suction water tank 52. In this case, all of the pumped water pumped up by the vertical shaft pump 10 can be discharged to the discharge side, and a decrease in pumping efficiency can be further suppressed. When one end of the discharge pipe 25 is connected to the discharge pipe 22, the connection part of the discharge pipe 25 with the discharge pipe 22 is located downstream of the connection part of the cooling water supply pipe 24 with the discharge pipe 22. .

  Further, the discharge pipe 25 has a valve 25 a for opening and closing the discharge pipe 25. By closing the valve 25a, the supply of pumped water to the suction water tank 52 can be stopped. Further, since the valve 24a and the valve 25a are provided in the cooling water supply pipe 24 and the discharge pipe 25, respectively, the electric motor 11 can be separated from the vertical pump 10 with the valve 24a and the valve 25a as a boundary.

  As in the illustrated example, the vertical shaft pump 10 may have a makeup water pipe 26 configured to supply water into the cooling box 30 separately from the cooling water supply pipe 24. The makeup water pipe 26 has one end connected to the cooling box 30 and the other end connected to a water source (not shown). The makeup water pipe 26 has a valve 26 a for opening and closing the makeup water pipe 26. Water is supplied to the cooling box 30 by opening the valve 26a. The replenishment water pipe 26 can supply water to the cooling box 30 even when the pump casing 20 is not pumped and the impeller 13 is rotating in the air. For this reason, the motor 11 can be continuously cooled even when the vertical shaft pump 10 is performing the preceding standby operation. Therefore, the vertical shaft pump 10 can be used as a preceding standby type pump. The replenishment water pipe 26 is not essential, and even if the replenishment water pipe 26 is not provided, the water can be supplied to the cooling box 30 through the cooling water supply pipe 24 when the vertical shaft pump 10 is performing a pumping operation.

  As described above, the cooling water supply pipe 24 and the makeup water pipe 26 have the valve 24a and the valve 26a, respectively. Therefore, by opening and closing the valve 24a and the valve 26a, when the vertical pump 10 is pumping water, the pump is supplied to the cooling box 30 via the cooling water supply pipe 24, and the vertical pump 10 operates in the air. When it is, water can be supplied to the cooling box 30 from the makeup water pipe 26. That is, the supply line for supplying pumped water or water to the cooling box 30 can be switched. Therefore, the electric motor 11 can be cooled using the cooling water of an appropriate system according to the operating state of the vertical shaft pump 10.

  Further, the makeup water pipe 26 may be configured not to supply water during normal operation of the vertical shaft pump 10 but to supply water in order to periodically flush the heat exchange unit 11d. Thereby, the fall of the heat exchange performance by the filth of the heat exchange part 11d adhering can be prevented. In addition, when the vertical shaft pump 10 handles a fluid with poor liquid quality such as seawater, corrosion of the heat exchanging portion 11d can be prevented, and the life of the heat exchanging portion 11d can be extended.

  Next, an example in which the cooling water supply pipe 24 shown in FIG. 1 is connected to another position will be described. 2 and 3 are schematic views showing an example in which the cooling water supply pipe 24 is connected to another position. In the example shown in FIG. 2, the discharge pipe 22 has a check valve 22b and a rising pipe 22c that goes to the water discharge tank 53 (see FIG. 1). In this case, as shown in FIG. 2, the cooling water supply pipe 24 may be connected to the discharge pipe 22 on the secondary side (downstream side) of the check valve 22b.

  In the example shown in FIG. 3, the discharge pipe 22 is connected to a water discharge tank 53, and a flap valve 22d that can be opened and closed is provided at the discharge port 22e. In this case, the cooling water supply pipe 24 may be connected to the water discharge tank 53 as shown in FIG.

  As shown in FIG. 2, when the discharge pipe 22 has the check valve 22b, the pumped water that flows into the secondary side of the check valve 22b does not flow back to the primary side of the check valve 22b. Further, since the discharge pipe 22 has the rising pipe 22c, the pumped water that has flowed into the secondary side of the check valve 22b flows into the water discharge tank 53 even when the vertical shaft pump 10 is operating in the air. It may have accumulated without. In this case, even when the vertical shaft pump 10 is operating in the air, the pumped water accumulated on the secondary side of the check valve can be supplied to the cooling box 30.

  Further, as shown in FIG. 3, since the discharged pumped water is stored in the water discharge tank 53, the pumped water can be continuously supplied from the water discharge tank 53 to the cooling box 30 through the cooling water supply pipe 24. Therefore, even when the vertical shaft pump 10 is operating in the air, the pumped water stored in the water discharge tank 53 can be supplied to the cooling box 30.

  2 and 3, when the cooling water supply pipe 24 is connected to the discharge pipe 22 and the water discharge tank 53, respectively, when the vertical pump 10 is operating normally (during pumping), The pressure at the connection point is the discharge pressure. For this reason, even during normal pumping, pumped water can be supplied to the cooling box 30 via the cooling water supply pipe 24. That is, it is possible to continuously supply pumped water to the cooling box 30 through one supply line without changing the pumping water supply line for cooling, whether during pumping or in air operation.

  Next, the cooling box 30 will be described in detail. FIG. 4 is an enlarged view of the cooling box 30 shown in FIG. Like the example of illustration, it is preferable that the cooling box 30 has the inspection port which is not illustrated in the side surface, and has the removable cover 30a for sealing this inspection port. When the cover 30a is removed, maintenance inside the cooling box 30 can be performed via the inspection port of the cooling box 30. Therefore, in this cooling box 30, the heat exchanging part 11d can be easily cleaned through the inspection port, and deterioration of the heat exchanging performance due to contamination of the heat exchanging part 11d can be prevented. Further, at least a part of the cover 30a may be formed of a transparent plate material such as acrylic. In this case, the inside of the cooling box 30 can be visually observed with the cover 30a attached to the cooling box 30, and the inspection work can be easily performed. As a result, the reliability of the vertical shaft pump 10 can be improved.

  As described above, the vertical shaft pump 10 can supply pumped water to the cooling box 30 through the cooling water supply pipe 24 and cool the electric motor 11 through the cooling box 30. Therefore, since it is not necessary to change the shape of the pump casing 20 (curved pipe 23) conventionally in order to cool the electric motor 11, the fluid loss of the vertical pump 10 is not increased. As a result, the stagnation part of the flow does not occur in the pump casing, and there is no adverse effect on the pump efficiency.

  In addition, since the stagnation part does not occur in the cooling box 30 and a reliable fluid flow occurs, the dust in the pumped water does not stay in the cooling box 30, and the heat of the pumped water or water and the motor 11 The replacement can be performed reliably, and the reliability of the vertical shaft pump 10 can be improved. As a result, it is possible to suppress a decrease in cooling efficiency due to dust stagnation associated with the operation of the vertical shaft pump 10.

  Moreover, since the diameter of the cooling water supply pipe 24 is very small with respect to the diameter of the discharge pipe 22, it is possible to prevent large dust in the pumped water from entering the cooling water supply pipe 24. Therefore, it is possible to prevent a relatively large dust contained in the pumped water pumped by the vertical shaft pump 10 from colliding with the heat exchanging portion 11d in the cooling box 30 and damaging the heat exchanging portion 11d.

  Further, since the vertical shaft pump 10 described above has the thrust bearing 15, the load and the fluid thrust force of the rotating shaft 12 during the pump operation can be appropriately supported by the thrust bearing 15.

  Further, since the vertical shaft pump 10 described above includes the joint 16 and the thrust bearing 15, the electric motor 11 can be easily separated / coupled to the rotating shaft 12. As a result, the electric motor 11 can be easily assembled and installed on the vertical shaft pump 10.

Moreover, only the electric motor 11 can be divided and conveyed. Therefore, the vertical shaft pump 10
The crane performance and the lifting height required when installing the engine at the pumping station 50 can be reduced. As a result, the economical efficiency of the pump station 50 as a whole can be improved, and the manufacturability and workability can be improved.

  When a flywheel for water hammer countermeasures is attached to an arbitrary place of the vertical shaft pump 10 or the rotating body of the electric motor 11 (the rotating shaft 12, the output shaft 11b, etc.), the height and size of the motor mount 14 are adjusted. Thus, the flywheel can be easily attached to the rotating body. A relatively large flywheel can also be attached to the rotating body. Furthermore, a bearing for supporting the weight of the flywheel can be provided in the cooling box 30, and the flywheel can be installed without special design of the electric motor 11 or the vertical shaft pump 10. The flywheel is separable from the electric motor 11 and the vertical shaft pump 10.

  As mentioned above, although embodiment of this invention was described, embodiment of the invention mentioned above 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 includes the equivalents thereof. In addition, any combination or omission of each component 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 can be achieved. is there.

DESCRIPTION OF SYMBOLS 10 Vertical shaft pump 11 Electric motor 11b Output shaft 11d Heat exchange part 12 Rotating shaft 13 Impeller 14 Motor mount 15 Thrust bearing 16 Joint 20 Pump casing 21 Suspension pipe 22 Discharge pipe 23 Curved pipe 24 Cooling water supply pipe 24a, 25a, 26a Valve 25 Drain pipe 26 Replenishment water pipe 30 Cooling box 30a Cover 50 Pump station 51 Foundation floor 52 Suction water tank 53 Water discharge tank

Claims (5)

A pump that pumps pumped water,
A main shaft to which an impeller is attached on one end side;
A pump casing surrounding at least a portion of the main shaft;
A water-resistant electric motor having a drive shaft connected to the other end of the main shaft and disposed outside the pump casing;
A cooling box configured to transfer heat of the water resistant motor to the pumped water to cool the water resistant motor;
A cooling water supply pipe configured to supply the pumped water into the cooling box;
A discharge pipe configured to discharge the pumped water supplied into the cooling box;
A thrust bearing provided in the pump casing for supporting the weight of the main shaft and the impeller and a fluid thrust force;
Have a, a joint that is configured to couple with a deformation tolerance and the drive shaft and the other end of the spindle in the vertical and horizontal directions,
The water-resistant motor has a heat radiating part for releasing heat generated from the water-resistant motor to the outside.
The heat dissipating part is disposed inside the cooling box, and is configured to contact the pumped water supplied to the cooling box and transmit the heat to the pumped water,
The joint is a pump disposed outside the pump casing . The pump according to claim 1, wherein
Having a makeup water pipe configured to supply water into the cooling box;
The cooling water supply pipe and the makeup water pipe have a valve that can be opened and closed. The pump according to claim 1 or 2 ,
The cooling box has a detachable cover. A pump according to any one of claims 1 to 3 ;
A foundation floor for installing the pump;
A suction water tank for storing liquid pumped by the pump;
And a water discharge tank for storing the liquid pumped by the pump. In the pump station according to claim 4 ,
The cooling water supply pipe has one end connected to the cooling box and the other end connected to the discharge pipe of the pump casing or the water discharge tank,
One end of the discharge pipe is connected to the cooling box, and the other end is connected to the discharge pipe, the suction water tank, or the water discharge tank of the pump casing.

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