JP2020002815A - Pump system, and cooling system for pump driving machine - Google Patents

Abstract

To provide a pump system comprising a cooling device having a simple structure and capable of efficiently cooling a cooling medium without impairing suction performance of a pump.SOLUTION: A pump system comprises a main shaft 32, an impeller 31 fixed to the main shaft 32, a pump casing 27 housing the impeller 31 internally, a pump driving machine 12 for rotating the main shaft 32, heat exchangers 10a and 11a fixed to the pump driving machine 12, a cooling device 50 arranged so as to surround the outside of the pump casing 27, and a cooling medium circulation line 80 connected to the heat exchangers 10a and 11a and the cooling device 50. The cooling device 50 comprises a heat transfer pipe 51 communicating with the cooling medium circulation line 80. A width of the cooling device 50 is smaller than a diameter of an opening 5. An upper end of the cooling device 50 is located at a position lower than a minimum water level of a suction water tank 1 at which a pump 20 can be operated. A lower end of the cooling device 50 is located at a position higher than a lower end of the pump casing 27.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pump system for pumping liquid in a suction water tank, and more particularly to a pump system provided with a cooling device for cooling a cooling medium for a pump driver, and a cooling system for the pump driver.

  An electric motor, a diesel engine, a gas turbine engine, or the like is used as a prime mover that constitutes a driving device for a vertical shaft pump or a horizontal shaft pump installed in a pump station. The prime mover requires cooling during operation, and an air-cooled system is mainly employed for cooling a small-capacity electric motor or a gas turbine engine. On the other hand, water-cooled systems are mainly used for diesel engines and large-capacity electric motors. Further, the power of the prime mover is transmitted to the pump via the speed reducer, and the speed reducer also requires cooling. Although the air-cooling system can relatively simplify the equipment, the water-cooling system requires a complicated cooling system as a whole and requires a space for installing the cooling system. As a water-cooling type cooling system, a system has been proposed in which cooling water for cooling a prime mover is cooled by a cooling device provided in a suction water tank or a suction bell mouth.

JP-A-10-184596 Japanese Utility Model Laid-Open No. 1-141393 JP 2001-349289 A

  Patent Document 1 proposes a cooling system in which a cooling device for cooling water is installed in a suction water tank. Such a cooling device is relatively large, and requires an installation space. In addition, since large dust and dust may hit the heat transfer tube of the cooling device and damage the heat transfer tube, and large dust and dust may be entangled in the heat transfer tube, the cooling device may be moved in the flow direction of the liquid in the suction water tank. It is common to install it on the downstream side of the dust remover (or screen), and the place where it can be installed is limited. In addition, an opening for pulling up the cooling device at the time of maintenance is required at the upper part of the installation location. Therefore, it is almost impossible to install a cooling device in the existing pump station.

  In Patent Literature 2, a passage for cooling water corresponding to a heat transfer tube is formed in the peripheral wall of the suction bellmouth. However, such a passage may impede the flow of water drawn into the pump, increase loss, and reduce pump efficiency. In addition, the flow of water may be disturbed, causing a drift, and causing the pump to vibrate.

  In Patent Literature 3, a pipe corresponding to a heat transfer pipe is provided on a cover for closing an inspection hole inside the pump. However, with such a structure, the heat transfer area of the pipe cannot be sufficiently ensured, so that the capacity for cooling a prime mover such as a diesel engine having a large calorific value is insufficient.

  The present invention has been made in view of the conventional problems described above, and has a simple configuration and a pump system including a cooling device that can efficiently cool a cooling medium without impairing the suction performance of the pump. The purpose is to provide. Another object of the present invention is to provide a cooling system including such a cooling device.

  In order to achieve the object described above, in one aspect, a pump system for pumping liquid in a suction water tank includes a main shaft, an impeller fixed to the main shaft, and a pump casing that houses the impeller inside. A pump driving device connected to the main shaft for rotating the main shaft, a heat exchanger fixed to the pump driving device, a cooling device arranged to surround the outside of the pump casing, An exchange and a cooling medium circulation line connected to the cooling device, the cooling device includes a heat transfer tube communicating with the cooling medium circulation line, and the width of the cooling device is formed on a pump installation floor. Smaller than the diameter of the opening, the upper end of the cooling device is located at a position lower than the lowest water level of the suction tank in which the pump can operate, and the lower end of the cooling device is the pump casing A pump system, characterized in that in a position higher than the lower end.

In one aspect, the cooling device further includes a vertically arranged inflow strut tube and an outflow strut tube, and the inflow strut tube has a plurality of first chambers arranged in a vertical direction therein. The outflow strut tube has a plurality of second rooms arranged in a vertical direction in the inside thereof, and one of any two vertically adjacent ones of the plurality of second rooms is One end of the plurality of first chambers has a cooling medium inlet connected to the cooling medium circulation line, and has a lower end located at a position lower than the other upper end. One of the cooling medium circulation lines has a cooling medium outlet connected to the cooling medium circulation line, the heat transfer tube is a plurality of horizontally extending semi-annular heat transfer tube, the plurality of first chamber, Each of the plurality of second chambers communicates with the plurality of second rooms through the plurality of heat transfer tubes. It is characterized in.
In one aspect, the inflow strut tube has a plurality of first horizontal partition plates arranged in a vertical direction therein, and the plurality of first chambers are partitioned by the plurality of first horizontal partition plates. The outflow strut tube has a vertical partition plate extending in the vertical direction and a plurality of second horizontal partition plates fixed to the vertical partition plate and arranged along the vertical direction. The plurality of second chambers are partitioned by the plurality of second horizontal partition plates and the vertical partition plate, and the plurality of second horizontal partition plates are one side surface and the other of the vertical partition plate. Characterized by being alternately arranged on the side surface.
In one aspect, the cooling device further includes a vertically arranged inflow strut tube and an outflow strut tube, and the inflow strut tube has a plurality of first chambers arranged in a vertical direction therein. The outflow strut tube has a plurality of second chambers arranged in a vertical direction therein, and one of the plurality of first chambers is connected to the cooling medium circulation line. One of the plurality of second chambers has a cooling medium outlet connected to the cooling medium circulation line, and the heat transfer tube extends spirally, The first room is characterized by being connected to each of the plurality of second rooms through the heat transfer tube.
In one aspect, the cooling device further includes an upper annular tube and a lower annular tube, wherein the heat transfer tubes are a plurality of heat transfer tubes extending in a vertical direction, and the upper annular tube is arranged along a circumferential direction thereof. A plurality of first rooms, the lower annular pipe has a plurality of second rooms arranged along a circumferential direction thereof, and the plurality of first rooms and the plurality of second rooms are , And are alternately connected by the plurality of heat transfer tubes.
In one aspect, the heat transfer tube has a polygonal cross section having a rounded vertex.
In one aspect, a discharge pipe arranged downstream of the pump casing, and a pipe cooler connected to the discharge pipe, the pipe cooler further includes a flow path structure connected to the cooling medium circulation line. And a housing for accommodating the flow path structure.
In one aspect, the cooling device is fixed to the pump casing via a gap.
In one aspect, the cooling device is placed on a fixing member fixed to an outer peripheral surface of the pump casing.
In one embodiment, the underwater bearing further rotatably supports the main shaft, the main shaft extends vertically through the pump casing, and the underwater bearing is disposed below the impeller. It is characterized by the following.

  In one aspect, a cooling system for cooling a pump driver that rotates a main shaft of a pump, the cooling system being arranged so as to surround a heat exchanger fixed to the pump driver and an outside of a pump casing of the pump. Cooling device, comprising a cooling medium circulation line connected to the heat exchanger and the cooling device, the cooling device includes a heat transfer tube communicating with the cooling medium circulation line, the width of the cooling device, The upper end of the cooling device is smaller than the minimum water level of the suction water tank in which the pump can be operated, and the lower end of the cooling device is smaller than the diameter of the opening formed in the pump installation floor. A cooling system located at a position higher than a lower end of the cooling system.

In one aspect, the cooling device further includes a vertically arranged inflow strut tube and an outflow strut tube, and the inflow strut tube has a plurality of first chambers arranged in a vertical direction therein. The outflow strut tube has a plurality of second rooms arranged in a vertical direction in the inside thereof, and one of any two vertically adjacent ones of the plurality of second rooms is One end of the plurality of first chambers has a cooling medium inlet connected to the cooling medium circulation line, and has a lower end located at a position lower than the other upper end. One of the cooling medium circulation lines has a cooling medium outlet connected to the cooling medium circulation line, the heat transfer tube is a plurality of horizontally extending semi-annular heat transfer tube, the plurality of first chamber, Each of the plurality of second chambers communicates with the plurality of second rooms through the plurality of heat transfer tubes. It is characterized in.
In one aspect, the inflow strut tube has a plurality of first horizontal partition plates arranged in a vertical direction therein, and the plurality of first chambers are partitioned by the plurality of first horizontal partition plates. The outflow strut tube has a vertical partition plate extending in the vertical direction and a plurality of second horizontal partition plates fixed to the vertical partition plate and arranged along the vertical direction. The plurality of second chambers are partitioned by the plurality of second horizontal partition plates and the vertical partition plate, and the plurality of second horizontal partition plates are one side surface and the other of the vertical partition plate. Characterized by being alternately arranged on the side surface.
In one aspect, the cooling device further includes a vertically arranged inflow strut tube and an outflow strut tube, and the inflow strut tube has a plurality of first chambers arranged in a vertical direction therein. The outflow strut tube has a plurality of second chambers arranged in a vertical direction therein, and one of the plurality of first chambers is connected to the cooling medium circulation line. One of the plurality of second chambers has a cooling medium outlet connected to the cooling medium circulation line, and the heat transfer tube extends spirally, The first room is characterized by being connected to each of the plurality of second rooms through the heat transfer tube.
In one aspect, the cooling device further includes an upper annular tube and a lower annular tube, wherein the heat transfer tubes are a plurality of heat transfer tubes extending in a vertical direction, and the upper annular tubes are arranged along a circumferential direction thereof. A plurality of first rooms, the lower annular pipe has a plurality of second rooms arranged along the circumferential direction thereof, and the plurality of first rooms and the plurality of second rooms are , And are alternately connected by the plurality of heat transfer tubes.
In one aspect, the heat transfer tube has a polygonal cross section having a rounded vertex.
In one embodiment, the cooling device further includes a pipe cooler connected to a discharge pipe disposed downstream of the pump casing, wherein the pipe cooler includes a flow path structure connected to the cooling medium circulation line, and a flow path structure. And a housing for housing the body.
In one aspect, the cooling device is formed on the pump installation floor by an overhead crane installed at a pump station, a suspended balance attached to the overhead crane, and a chain block provided on the suspended balance. It is characterized in that it can be lifted up to the opening.

  Since the cooling device is disposed so as to surround the outside of the pump casing, the configuration of the pump system can be simplified, the reliability of the pump system can be improved, and the cooling medium can be efficiently cooled. In addition, since the cooling device is arranged at a position that does not hinder the flow of the liquid in the suction water tank, stable operation of the pump is possible without impairing the suction performance of the pump.

It is a mimetic diagram showing a pump system concerning one embodiment of the present invention. It is a perspective view which shows a cooling device typically. FIG. 2 is a sectional view taken along line AA of FIG. 1. FIGS. 4A to 4D are schematic diagrams showing modified examples of the cross-sectional shape of the heat transfer tube. It is a perspective view which shows other embodiments of a cooling device typically. FIG. 9 is a perspective view schematically showing still another embodiment of the cooling device. FIG. 7 is a side view of FIG. 6. It is a mimetic diagram showing other embodiments of a pump system. It is a mimetic diagram showing still another embodiment of a pump system. FIG. 10 is a schematic view illustrating a method of cleaning the cooling device illustrated in FIG. 9. It is a mimetic diagram showing still another embodiment of a pump system. It is a mimetic diagram showing still another embodiment of a pump system. It is a mimetic diagram showing still another embodiment of a pump system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a pump system according to one embodiment of the present invention. The pump system shown in FIG. 1 includes a pump 20 for pumping the liquid in the suction water tank 1, a pump driver 12 for driving the pump 20, and a cooling system 200 for cooling the pump driver 12. The pump 20 shown in FIG. 1 is a so-called vertical pump.

  The pump 20 includes a main shaft 32 extending in the vertical direction, an impeller 31 fixed to the main shaft 32, a pump casing 27 that houses the impeller 31 therein, and a pumping pipe 28 connected to an upper end of the pump casing 27. The discharge curved pipe 30 connected to the upper end of the pumping pipe 28, the discharge pipe 34 connected to the discharge-side (downstream side in the flow direction of the pumped liquid) end of the discharge curved pipe 30, and the discharge pipe 34 And a discharge valve 44 connected thereto.

  The pump casing 27 is suspended in the suction water tank 1 by a pumping pipe 28. In the present embodiment, the pump casing 27 includes the suction bell mouth 22, the impeller casing 21, and the discharge bowl 24. The upper end of the discharge bowl 24 is connected to the lower end of the water pipe 28. The upper end of the impeller casing 21 is connected to the lower end of the discharge bowl 24. The suction bell mouth 22 has a suction port 22 a opened downward, and an upper end of the suction bell mouth 22 is connected to a lower end of the impeller casing 21. The suction port 22a is formed at a lower end of the pump casing 27. The impeller 31 is housed in the impeller casing 21 and the discharge bowl 24. The discharge pipe 34 is disposed downstream of the pump casing 27 in the flow direction of the pumped liquid.

  The pumping pipe 28 extends downward through an opening 5 formed in the pump installation floor 2 constituting the upper wall of the suction water tank 1. A suspension pipe 33 is fixed to an upper end of the water pump pipe 28. The suspension pipe 33 is fixed to a pump base 35 installed on the pump installation floor 2. The pumping pipe 28 is fixed to the pump installation floor 2 via a suspension pipe 33 and a pump base 35. The main shaft 32 extends vertically through the discharge curved pipe 30 and the water pumping pipe 28, and the lower end of the main shaft 32 is located in the pump casing 27.

  The main shaft 32 is rotatably supported by the outer bearing 45 and the underwater bearing 41. The outer bearing 45 is fixed to an upper part of the discharge curved pipe 30 and supports an upper part of the main shaft 32. The underwater bearing 41 is housed in the discharge bowl 24 and supports the lower part of the main shaft 32. An inner bowl 25 is arranged inside the discharge bowl 24, and the inner bowl 25 is connected to the discharge bowl 24 by a plurality of guide vanes 37. The underwater bearing 41 is fixed to the inner surface of the inner bowl 25 via a support member 41a. The main shaft 32 extends upward from the curved discharge pipe 30.

  The drive installation floor 6 is installed above the pump installation floor 2. The drive shaft 12a of the pump drive 12 extends downward through the opening 8 formed in the drive installation floor 6 and the gantry 13. The gantry 13 is fixed to the drive installation floor 6 so as to cover the opening 8. The drive shaft 12 a of the pump drive unit 12 is connected to the main shaft 32 via the connection shaft 15. The main shaft 32 and the impeller 31 are configured to be rotated by the pump driver 12.

  The pump driving device 12 includes a prime mover 11 and a speed reducer 10. The speed reducer 10 is installed on a gantry 13. The reduction gear 10 is connected to the prime mover 11, and the main shaft 32 is connected to the reduction gear 10 via the connection shaft 15. As the prime mover 11, a diesel engine, a gas turbine engine, an electric motor, or the like can be used. In the present embodiment, the drive shaft 12a of the pump drive unit 12 is constituted by the output shaft of the speed reducer 10.

  One end of the connection shaft 15 is connected to the upper end of the main shaft 32, and the other end of the connection shaft 15 is connected to the output shaft of the reduction gear 10, which is the drive shaft 12 a of the pump drive 12. The main shaft 32 and the impeller 31 are configured to be rotated by the prime mover 11 via the speed reducer 10. The pump drive 12 is installed on the drive installation floor 6. Specifically, the prime mover 11 is fixed on the drive installation floor 6, and the speed reducer 10 is fixed on the drive installation floor 6 via the gantry 13.

  The plurality of guide vanes 37 are disposed above the impeller 31 (discharge side). A liquid flow path is formed between the inner surface of the discharge bowl 24 and the outer surface of the inner bowl 25. When the impeller 31 rotates, the liquid in the suction water tank 1 is sucked from the suction port 22 a of the pump casing 27. The liquid is transferred to the discharge pipe 34 through the pump casing 27, the water pump 28, and the discharge curved pipe 30 by the rotation of the impeller 31. In the present embodiment, the liquid in the suction water tank 1 is water, but the liquid in the suction water tank 1 is not limited to water.

  The pump driver 12 needs to be cooled in order to suppress a temperature rise due to heat generation during the operation. The cooling system 200 is configured to cool the pump driver 12 by heat exchange using a cooling medium. Examples of such a cooling medium include water and antifreeze.

  As shown in FIG. 1, the cooling system 200 includes a circulation pump 17 that circulates a cooling medium in the cooling system 200, heat exchangers 10 a and 11 a that perform heat exchange between the pump driver 12 and the cooling medium, A cooling device 50 that performs heat exchange between the liquid in the suction water tank 1 and the cooling medium, a cooling medium circulation line 80 that forms a circulation path of the cooling medium, and an expansion tank 90 that stores the cooling medium. And a temperature control valve 93 attached to the cooling medium circulation line 80.

  The heat exchangers 10a and 11a are fixed to the pump drive 12. More specifically, the heat exchanger 10a is fixed to the speed reducer 10, and the heat exchanger 10a is configured to perform heat exchange between the speed reducer 10 and the cooling medium. The heat exchanger 11a is fixed to the prime mover 11, and the heat exchanger 11a is configured to exchange heat between the prime mover 11 and the cooling medium. The cooling device 50 is arranged in the suction water tank 1. The cooling device 50 has a cylindrical shape as a whole, and is arranged so as to surround the outside of the pump casing 27. The cooling device 50 is fixed to the pump casing 27 via a gap.

  The heat exchangers 10a, 11a and the cooling device 50 are connected to a cooling medium circulation line 80, and the heat exchangers 10a, 11a communicate with the cooling device 50 through the cooling medium circulation line 80. The cooling system 200 is a closed-loop cooling system that circulates a cooling medium between the heat exchangers 10a and 11a and the cooling device 50 through a cooling medium circulation line 80. The cooling medium circulation line 80 includes a first circulation line 81, a second circulation line 82, a third circulation line 83, a fourth circulation line 84, and a fifth circulation line 85.

  The expansion tank 90 is connected to a cooling medium circulation line 80, and the cooling medium in the expansion tank 90 is supplied to the cooling medium circulation line 80. The expansion tank 90 is connected to one end of the first circulation line 81, and the other end of the first circulation line 81 is connected to the circulation pump 17. The circulation pump 17 is disposed downstream of the expansion tank 90 in the flow direction of the cooling medium (hereinafter, simply referred to as downstream). The circulation pump 17 communicates with the expansion tank 90 through the first circulation line 81.

  One end of the second circulation line 82 is connected to the circulation pump 17. The second circulation line 82 extends through the heat exchanger 11a and further extends through the opening 5 into the suction water tank 1. The heat exchanger 11a is connected to the second circulation line 82 and communicates with the circulation pump 17 through the second circulation line 82. The other end of the second circulation line 82 is connected to the cooling device 50. The cooling device 50 is arranged downstream of the circulation pump 17 and communicates with the circulation pump 17 through the second circulation line 82.

  The temperature control valve 93 is attached to the second circulation line 82. The temperature control valve 93 is constituted by a three-way valve having one inlet port and two outlet ports. The inlet port of the temperature control valve 93 and one of the two outlet ports are connected to the second circulation line 82, and the other outlet port is connected to one end of the third circulation line 83. The other end of the third circulation line 83 is connected to the first circulation line 81. The first circulation line 81 communicates with the second circulation line 82 through the third circulation line 83 and the temperature control valve 93.

  One end of the fourth circulation line 84 is connected to the second circulation line 82 on the upstream side of the heat exchanger 11a in the flow direction of the cooling medium (hereinafter, simply referred to as the upstream side). The other end of the fourth circulation line 84 is connected to the second circulation line 82 on the downstream side of the temperature control valve 93. The fourth circulation line 84 extends through the heat exchanger 10a. The heat exchanger 10a is connected to the fourth circulation line 84 and communicates with the second circulation line 82 through the fourth circulation line 84.

  One end of the fifth circulation line 85 is connected to the cooling device 50. The fifth circulation line 85 extends upward from the cooling device 50 through the opening 5. The other end of the fifth circulation line 85 is connected to the first circulation line 81. The cooling device 50 communicates with the first circulation line 81 through the fifth circulation line 85.

  Hereinafter, an outline of the cooling system 200 will be described. The cooling medium is sent to the heat exchanger 11a by the circulation pump 17. The cooling medium exchanges heat with the prime mover 11 in the heat exchanger 11 a to cool the prime mover 11. The cooling medium that has passed through the heat exchanger 11a is sent to the temperature control valve 93 through the second circulation line 82.

  The temperature control valve 93 is a three-way valve that operates according to the temperature of the cooling medium. As described above, the temperature control valve 93 has an inlet port and an outlet port connected to the second circulation line 82, and another outlet port connected to the third circulation line 83. When the temperature of the cooling medium is higher than a predetermined temperature, the temperature control valve 93 operates so that the inlet port and the outlet port connected to the second circulation line 82 communicate with each other. The cooling medium is sent to the cooling device 50 through the second circulation line 82. When the temperature of the cooling medium is lower than a predetermined temperature, the temperature control valve 93 is connected so that the inlet port connected to the second circulation line 82 and the outlet port connected to the third circulation line 83 communicate with each other. Operate. The cooling medium is returned to the circulation pump 17 through the third circulation line 83 and the first circulation line 81. Thus, the cooling medium circulates between the heat exchanger 11a and the temperature control valve 93 until the temperature of the cooling medium rises to the predetermined temperature.

  It is known that a diesel engine, which is an example of the prime mover 11, operates at an appropriate temperature to prevent malfunction and deterioration of fuel consumption. For this reason, the circulation pump 17 circulates the cooling medium between the heat exchanger 11a and the temperature control valve 93 until the temperature of the cooling medium rises to a predetermined temperature. If the temperature of the cooling medium is too high, malfunctions, performance, and deterioration of the performance of the prime mover 11 are caused, so the cooling medium is sent to the cooling device 50 by the circulation pump 17.

  The cooling medium is sent to the heat exchanger 11a by the circulation pump 17 and also sent to the heat exchanger 10a through the fourth circulation line 84. The cooling medium exchanges heat with the speed reducer 10 in the heat exchanger 10 a to cool the speed reducer 10. The cooling medium that has passed through the heat exchanger 10a is sent to the cooling device 50 through the fourth circulation line 84 and the second circulation line 82.

  The cooling medium sent to the cooling device 50 (that is, the cooling medium warmed by the pump driving device 12) undergoes heat exchange with the liquid in the suction water tank 1 in the cooling device 50 and is cooled. The cooling medium cooled by the cooling device 50 is sent to the circulation pump 17 again through the fifth circulation line 85 and the first circulation line 81. The cooled cooling medium is used again for cooling the pump drive unit 12. Thus, the cooling medium circulates in the cooling medium circulation line 80 between the heat exchangers 10a and 11a and the cooling device 50.

  In the present embodiment, the circulation pump 17 is connected to the prime mover 11 and is configured to be driven by the prime mover 11. Therefore, the circulating pump 17 does not require a dedicated power source, and simplification of the circulating pump 17, improvement in reliability, reduction in maintenance management load, and the like can be achieved. In one embodiment, the circulation pump 17 may be a pump having a power source independent of the prime mover 11.

  In one embodiment, the prime mover 11 may be a horizontal motor. When the horizontal shaft motor has a water cooling structure, a shaft end pump connected to the motor shaft may be used as the circulation pump 17. Further, in one embodiment, the prime mover 11 may be a water-cooled direct-coupled motor.

  By circulating the cooling medium in a closed loop, replenishment of the cooling medium is substantially unnecessary, and simplification of the cooling system, improvement in reliability, and reduction in maintenance management load can be achieved.

  The cooling medium circulation line 80 is completed in the pump station. Therefore, the cooling medium circulation line 80 is not laid outdoors, and there is no possibility that the cooling medium circulation line 80 freezes in winter. Further, there is no possibility that the cooling medium circulation line 80 may be damaged due to uneven settlement during an earthquake.

  When the temperature of the cooling medium increases due to heat exchange, the volume of water in the cooling medium circulation line 80 expands. The expansion tank 90 is a tank that absorbs the increased volume.

  The width (outer diameter) of the cooling device 50 is smaller than the diameter of the opening 5. As a result, when performing maintenance or repair of the pump 20, the cooling device 50 can be pulled up through the opening 5 together with the pump 20 without removing the cooling device 50 from the pump 20. The upper end of the cooling device 50 is located at a position lower than the lowest water level (LWL) of the suction water tank 1 in which the pump 20 can be operated, and the lower end of the cooling device 50 is lower than the lower end of the pump casing 27 (the lower end of the suction bell mouth 22). Is also in a high position. In addition, since the cooling device 50 is installed outside the pump casing 27, stable operation of the pump 20 is enabled without causing a decrease in pump efficiency due to drift or the like. Further, since the cooling device 50 is located at a position higher than the lower end of the pump casing 27 (the lower end of the suction bell mouth 22), stable operation can be performed without obstructing the flow of the liquid in the suction water tank 1.

  FIG. 2 is a perspective view schematically showing the cooling device 50, and FIG. 3 is a sectional view taken along line AA of FIG. As shown in FIGS. 2 and 3, the cooling device 50 includes a plurality of semi-annular heat transfer tubes 51, a cylindrical inflow support tube 53, and a cylindrical outflow support tube 54. The inflow strut tube 53 and the outflow strut tube 54 are fixed to the pump casing 27 via a fixing member 69 shown in FIG.

  The inflow support tube 53 is disposed vertically. The inflow support pipe 53 includes a plurality of first chambers 61 arranged in a vertical direction therein and a plurality of first horizontal partition plates 57 arranged in a vertical direction. The plurality of first rooms 61 are partitioned by the plurality of first horizontal partition plates 57. The first horizontal partition plate 57 of the present embodiment has a disk shape.

  One of the plurality of first chambers 61 has a cooling medium inlet 65 connected to the second circulation line 82. The inflow strut tube 53 is configured to flow the cooling medium from the second circulation line 82 into the inflow strut tube 53 through the cooling medium inlet 65. In the present embodiment, the uppermost first chamber 61 has a cooling medium inlet 65.

  The outflow column 54 is arranged vertically. The outflow strut pipe 54 has a plurality of second chambers 62 arranged therein along the vertical direction, a vertical partition plate 60 extending in the vertical direction, and fixed to the vertical partition plate 60 and arranged along the vertical direction. And a plurality of second horizontal partition plates 58. The plurality of second chambers 62 are partitioned by the plurality of second horizontal partition plates 58 and the vertical partition plate 60. The plurality of second horizontal partition plates 58 are alternately arranged on one side surface and the other side surface of the vertical partition plate 60. The second horizontal partition plate 58 of the present embodiment has a semi-disc shape. One of any two vertically adjacent ones of the plurality of second rooms 62 has a lower end that is lower than the other upper end.

  One of the plurality of second chambers 62 has a cooling medium outlet 66 connected to the fifth circulation line 85. The outflow strut tube 54 is configured to cause the cooling medium to flow from the outflow strut tube 54 to the fifth circulation line 85 through the cooling medium outlet 66. In the present embodiment, the lowermost second chamber 62 has a cooling medium outlet 66.

  Each of the plurality of heat transfer tubes 51 extends horizontally. One ends of the plurality of heat transfer tubes 51 are connected to a plurality of first rooms 61, and the other ends of the plurality of heat transfer tubes 51 are connected to a plurality of second rooms 62. The plurality of first rooms 61 communicate with the plurality of second rooms 62 through the plurality of heat transfer tubes 51, respectively. The heat transfer tube 51 communicates with the cooling medium circulation line 80 through the inflow support tube 53 and the outflow support tube 54.

  The plurality of heat transfer tubes 51 are arranged apart from each other along the vertical direction. The plurality of heat transfer tubes 51 include a plurality of sets of semi-annular heat transfer tubes 51 symmetrically arranged around the inflow support tube 53 and the outflow support tube 54. The two semicircular heat transfer tubes 51 of each set form a ring when viewed from above. The uppermost heat transfer tube 51 does not form a ring. One end of each of the two heat transfer tubes 51 forming an annular shape is connected to the same first room 61, and the other end is connected to each of the above-described two vertically adjacent second rooms 62.

  In the present embodiment, two heat transfer tubes 51 are connected to each first room 61 other than the first room 61 at the top. That is, only one ring is formed by the two heat transfer tubes 51 through one first room 61. In one embodiment, four or more heat transfer tubes 51 may form two or more rings passing through the same first room 61. As described above, by increasing the number of the heat transfer tubes 51, the heat exchange capacity of the cooling device 50 can be improved.

  Hereinafter, the flow of the cooling medium flowing into the cooling device 50 will be described. The cooling medium flows into the inflow support tube 53 from the cooling medium inlet 65, flows through the heat transfer tube 51, and flows out from the cooling medium outlet 66 to the fifth circulation line 85. More specifically, the cooling medium flows from the cooling medium inlet 65 into the uppermost first room 61, and is sent to the uppermost second room 62 through the uppermost heat transfer tube 51. Further, the cooling medium flows from the uppermost second room 62 through the heat transfer tube 51 to the first room 61 in the second stage from the top, and further passes through the heat transfer tube 51 to the second room 62 in the second stage from the top. It is sent to two rooms 62. Hereinafter, the flow direction of the cooling medium at this time is defined as a positive direction. The cooling medium flows from the second room 62 at the second tier from the top through the heat transfer tube 51 to the first room 61 at the third tier from the top, and further passes through the heat transfer tube 51 to the third room at the third tier from the top. It is sent to two rooms 62. Hereinafter, the flow direction of the cooling medium at this time is defined as a reverse direction. In the same manner, the cooling medium is sent to the lower stage while flowing alternately in the forward and reverse directions. Finally, the cooling medium sent to the lowermost second room 62 flows out of the cooling medium outlet 66 to the fifth circulation line 85. According to the present embodiment, the plurality of first rooms 61 and the plurality of second rooms 62 are connected alternately and in series by the plurality of heat transfer tubes 51.

  In this way, by moving the cooling medium from the upper stage to the lower stage while drawing a circle, the heat exchange surface area can be increased (the distance of the heat transfer tube 51 can be increased), and the cooling medium can be cooled effectively. can do. The outer diameter and the number of the heat transfer tubes 51 are determined based on the flow rate of the cooling medium and the amount of heat exchanged. As an example, the outer diameter of the heat transfer tube 51 is 25 mm to 40 mm. In the present embodiment, the material of the heat transfer tube 51 is stainless steel, but the material of the heat transfer tube 51 is not limited to stainless steel.

  In the present embodiment, the first room 61 at the top has a cooling medium inlet 65 and the second room 62 at the bottom has a cooling medium outlet 66. One first room 61 may have a cooling medium inlet 65 and the uppermost second room 62 may have a cooling medium outlet 66. That is, the cooling device 50 shown in FIG. 2 may be arranged upside down. Also in this case, the cooling medium is sent from the lower stage to the upper stage while flowing alternately in the forward direction and the reverse direction.

  Although the cross-sectional shape of the heat transfer tube 51 of this embodiment is circular, the cross-sectional shape of the heat transfer tube 51 is not limited to this embodiment. FIGS. 4A to 4D are schematic diagrams showing modified examples of the cross-sectional shape of the heat transfer tube 51. As shown in FIGS. 4A to 4D, the heat transfer tube 51 has a star shape (FIG. 4A), a cross shape (FIG. 4B), and a hexagonal shape (FIG. 4C). ), An eight-vertex shape (FIG. 4D), or a polygonal cross section having rounded vertices. In the example illustrated in FIGS. 4A to 4D, since the vertices of the cross section of the heat transfer tube 51 are rounded, dust and trash contained in the liquid in the suction water tank 1 are entangled with the heat transfer tube 51. Can be prevented.

  The heat exchange capacity of the heat transfer tube 51 improves as the surface area of the heat transfer tube 51 increases. As an example, it is expected that the star-shaped tube (FIG. 4A) can improve the heat exchange capacity by about 1.8 times as compared with a circular tube having the same cross-sectional area. The heat transfer tube 51 having the cross-sectional shape described with reference to FIGS. 4A to 4D can be manufactured by extrusion molding. By using the heat transfer tube 51 having the cross-sectional shape described with reference to FIGS. 4A to 4D, the heat exchange capacity can be increased.

  In one embodiment, the cooling device 50 may include a plurality of inflow strut tubes 53 and a plurality of outflow strut tubes 54. The outer diameter and the number of the inflow support pipe 53 and the outflow support pipe 54 are determined based on the flow rate of the cooling medium and the exchanged heat. As an example, the outer diameters of the inflow strut tube 53 and the outflow strut tube 54 are 75 mm to 150 mm.

  In the present embodiment, the material of the inflow strut tube 53 and the outflow strut tube 54 is stainless steel, but the material of the inflow strut tube 53 and the outflow strut tube 54 is not limited to stainless steel. In the present embodiment, the inflow strut tube 53 and the outflow strut tube 54 have a cylindrical shape, but the shapes of the inflow strut tube 53 and the outflow strut tube 54 are not limited to the cylindrical shape. In one embodiment, the inflow strut tube 53 and the outflow strut tube 54 may be rectangular tubes.

  FIG. 5 is a perspective view schematically showing another embodiment of the cooling device 50. The configuration related to the present embodiment, which is not particularly described, is the same as the embodiment described with reference to FIGS. As shown in FIG. 5, the outflow strut tube 54 of the present embodiment has a plurality of second chambers 62 arranged vertically along the inside thereof and a plurality of second horizontal partitions arranged vertically along the inside thereof. And a plate 58. The outflow strut tube 54 of the present embodiment does not have the vertical partition plate 60 therein, and the second horizontal partition plate 58 of the present embodiment has a disk shape. In the present embodiment, the plurality of second rooms 62 are partitioned by the plurality of second horizontal partition plates 58.

  The plurality of heat transfer tubes 51 of the present embodiment extend spirally as a whole. One ends of the plurality of heat transfer tubes 51 are connected to a plurality of first rooms 61, and the other ends of the plurality of heat transfer tubes 51 are connected to a plurality of second rooms 62. The plurality of first rooms 61 communicate with the plurality of second rooms 62 through the plurality of heat transfer tubes 51, respectively. The plurality of heat transfer tubes 51 extending spirally as a whole connect the plurality of first rooms 61 and the plurality of second rooms 62 alternately. Specifically, the first heat transfer tube 51 extends from the uppermost first room 61 to the uppermost second room 62. The second heat transfer tube 51 extends from the uppermost second room 62 to the second stage first room 61. The third heat transfer tube 51 extends from the first room 61 of the second stage to the second room 62 of the second stage. Similarly, the plurality of heat transfer tubes 51 extend downward while alternately connecting the first room 61 and the second room 62. The last heat transfer tube 51 is connected to the lowermost second room 62 of the plurality of second rooms 62. According to the present embodiment, the plurality of first rooms 61 and the plurality of second rooms 62 are connected alternately and in series by the plurality of heat transfer tubes 51.

  The inflow strut tube 53 and the outflow strut tube 54 of the present embodiment can be manufactured more easily than the inflow strut tube 53 and the outflow strut tube 54 described with reference to FIGS. In one embodiment, the cooling device 50 may include a plurality of sets of a plurality of heat transfer tubes 51 extending spirally as a whole. The plurality of sets of heat transfer tubes 51 are arranged in parallel with each other. As described above, by increasing the number of the heat transfer tubes 51, the heat exchange capacity of the cooling device 50 can be improved.

  Further, in one embodiment, one heat transfer tube 51 extending in a spiral shape may be directly connected to the cooling medium circulation line 80. More specifically, one end of the spiral heat transfer tube 51 is connected to the second circulation line 82, and the other end of the spiral heat transfer tube 51 is connected to the fifth circulation line 85. In this case, the inflow support pipe 53, the outflow support pipe 54, and the fixing member 69 become unnecessary. One heat transfer tube 51 extending in a spiral shape may be directly attached to the outer peripheral surface of the pump casing 27. By directly attaching the heat transfer tube 51 to the pump casing 27, a cooling effect by the liquid flowing inside the pump casing 27 can be obtained, and the heat exchange capacity of the cooling device 50 can be improved. The configuration of each embodiment described with reference to FIGS. 4A to 4D can also be applied to the embodiment described with reference to FIG.

  FIG. 6 is a perspective view schematically showing still another embodiment of the cooling device 50, and FIG. 7 is a side view of FIG. The configuration relating to the present embodiment, which is not particularly described, is the same as the embodiment described with reference to FIG. As shown in FIGS. 6 and 7, the cooling device 50 of the present embodiment includes an upper annular pipe 71, a lower annular pipe 72, a pipe support member 74 fixed to the upper surface of the upper annular pipe 71, and an upper annular pipe 71. A plurality of heat transfer tubes 51 are connected to the tube 71 and the lower annular tube 72. The upper annular pipe 71 and the lower annular pipe 72 are arranged horizontally, and are arranged apart from each other along the vertical direction. In the present embodiment, the pump casing 27 is arranged inside the upper annular pipe 71 and the lower annular pipe 72.

  The upper annular pipe 71 has a plurality of first chambers 61 arranged along its circumferential direction, and the lower annular pipe 72 has a plurality of second chambers 62 arranged along its circumferential direction. ing. One of the plurality of first rooms 61 has a cooling medium inlet 65 connected to the second circulation line 82, and the other one of the plurality of first rooms 61 has a fifth circulation line 85. The cooling medium outlet 66 is connected to the cooling medium outlet 66.

  The fifth circulation line 85 extends from the cooling medium outlet 66 along the upper surface of the upper annular pipe 71 to the pipe support member 74, and is bent upward on the pipe support member 74. In the present embodiment, the pipe support member 74 is on the opposite side of the upper annular pipe 71 when viewed from the second circulation pipe 82, but the position of the pipe support member 74 is not limited to this embodiment.

  The heat transfer tubes 51 of the present embodiment are a plurality of heat transfer tubes 51 extending in the vertical direction. One ends of the plurality of heat transfer tubes 51 are connected to the upper annular tube 71, and the other ends of the plurality of heat transfer tubes 51 are connected to the lower annular tube 72. The plurality of first rooms 61 and the plurality of second rooms 62 are connected alternately and in series by a plurality of heat transfer tubes 51. The plurality of first rooms 61 communicate with the plurality of second rooms 62 through the plurality of heat transfer tubes 51, respectively. More specifically, two heat transfer tubes 51 are connected to one first room 61, and the two heat transfer tubes 51 are connected to two adjacent second rooms 62, respectively. Two heat transfer tubes 51 are connected to one second room 62, and the two heat transfer tubes 51 are connected to two adjacent first rooms 61, respectively. The plurality of heat transfer tubes 51 communicate with the cooling medium circulation line 80 through the upper annular tube 71.

  The cooling medium flows into the upper annular pipe 71 from the cooling medium inlet 65, flows through the heat transfer pipe 51, and flows out from the cooling medium outlet 66 to the fifth circulation line 85. Specifically, the cooling medium flows into one of the plurality of first rooms 61 from the cooling medium inlet 65, and is sent to one of the plurality of second rooms 62 through the heat transfer tube 51. The cooling medium sent to the second room 62 is sent to another first room 61 through the heat transfer tube 51, and further sent to another second room 62 through the heat transfer tube 51. As described above, the cooling medium goes around the inside of the cooling device 50 while flowing alternately through the first room 61 and the second room 62, and flows out from the cooling medium outlet 66 to the fifth circulation line 85.

  In the present embodiment, two heat transfer tubes 51 are connected to one first room 61, but four or more heat transfer tubes 51 may be connected. By increasing the number of the heat transfer tubes 51, the heat exchange capacity of the cooling device 50 can be improved. Although the cross-sectional shape of the heat transfer tube 51 of this embodiment is circular, the cross-sectional shape of the heat transfer tube 51 is not limited to this embodiment. The cross-sectional shape of the heat transfer tube 51 described with reference to FIGS. 4A to 4D can also be applied to the heat transfer tube 51 of the present embodiment.

  The outer diameter and the number of the heat transfer tubes 51 are determined based on the flow rate of the cooling medium and the amount of heat exchanged. As an example, the outer diameter of the heat transfer tube 51 is 25 mm to 40 mm. In the present embodiment, the material of the heat transfer tube 51, the upper annular tube 71, and the lower annular tube 72 is stainless steel, but the material of the heat transfer tube 51, the upper annular tube 71, and the lower annular tube 72 is stainless steel. Not limited.

  Since the heat transfer tubes 51 of the present embodiment extend in the vertical direction, dust and dust floating in the suction water tank 1 are hardly caught by the heat transfer tubes 51. In addition, since the heat transfer tubes 51 are arranged in the vertical direction, the cleaning becomes easy, so that the present embodiment is a structure preferable for maintenance.

  FIG. 8 is a schematic diagram showing another embodiment of the pump system. The configuration related to the present embodiment, which is not particularly described, is the same as the embodiment described with reference to FIGS. As shown in FIG. 8, the pump system of the present embodiment further includes an in-pipe cooler 100 as a cooling device. The in-pipe cooler 100 is connected to the discharge pipe 34, and forms a flow path for the liquid pumped up from the suction water tank 1 integrally with the discharge pipe 34. The in-pipe cooler 100 includes a flow path structure 101 connected to the cooling medium circulation line 80 (fifth circulation line 85), and a housing 102 that houses the flow path structure 101. The housing 102 is connected to the discharge pipe 34, and the liquid pumped from the suction water tank 1 flows inside the housing 102.

  The flow path structure 101 includes an inflow header 105, an outflow header 106, and a plurality of cooler heat transfer tubes 110. One ends of the plurality of cooler heat transfer tubes 110 are connected to the inflow header 105, and the other ends of the plurality of cooler heat transfer tubes 110 are connected to the outflow header 106. The inflow header 105 and the outflow header 106 are connected to the fifth circulation line 85. The cooler heat transfer tube 110 is arranged parallel to the flow direction of the liquid in the in-tube cooler 100. The cooling medium flowing out of the cooling device 50 flows into the inflow header 105, and flows out to the fifth circulation line 85 through the cooler heat transfer tube 110 and the outflow header 106.

  Heat exchange is performed between the cooling medium flowing in the cooler heat transfer tube 110 and the liquid flowing in the housing 102, and the cooling medium is further cooled by the liquid flowing in the in-tube cooler 100. As described above, by using the cooling device 50 and the in-pipe cooler 100 together, the cooling capacity of the cooling system 200 can be further improved. The in-pipe cooler 100 is a simplified cooling device like the cooling device 50. Therefore, the present embodiment can improve the cooling capacity of the cooling system 200 while maintaining the reliability of the cooling system 200. The configuration of the embodiment described with reference to FIG. 8 can also be applied to each embodiment described with reference to FIGS.

  FIG. 9 is a schematic diagram showing still another embodiment of the pump system. The configuration related to the present embodiment, which is not particularly described, is the same as the embodiment described with reference to FIGS. As shown in FIG. 9, the pump 20 of the present embodiment further includes a fixing member 120 fixed to an outer peripheral surface of the pump casing 27 (an outer peripheral surface of the suction bell mouth 22). The suspension pipe 33 of the present embodiment has an opening 121 for cleaning. The cooling device 50 of the present embodiment is simply placed on the fixing member 120, and the cooling device 50 is configured to be able to be lifted from the fixing member 120. By raising the cooling device 50 to the opening 5, the worker on the pump installation floor 2 can clean the cooling device 50.

  FIG. 10 is a schematic diagram showing a method of cleaning the cooling device 50 shown in FIG. An overhead crane 130 is installed above the driving machine installation floor 6 in the pump station, and a hanging balance 128 is attached to the overhead crane 130. A plurality of chain blocks 126 are suspended from the suspension balance 128. The hooks 126 a of the plurality of chain blocks 126 can be lowered below the drive installation floor 6 through the plurality of lifting openings 125 formed in the gantry 13.

  The cooling device 50 can be lifted to the opening 5 by the overhead crane 130 and the chain block 126 installed at the pump station. Specifically, the hooks 126a of the plurality of chain blocks 126 are hooked on the second circulation line 82 and the fifth circulation line 85, respectively, and the second circulation line 82 and the fifth circulation line 85 are pulled up by the chain block 126, so that the cooling is performed. The device 50 can be lifted up to the opening 5.

  By lifting the cooling device 50 to the opening 5, the cooling device 50 can be cleaned without raising the entire pump 20 and without disassembling the speed reducer 10 and the pump 20. After lifting the cooling device 50 to the opening 5, the worker can clean the cooling device 50 from above the pump installation floor 2 by using the cleaning opening 121 formed in the hanging pipe 33. As an example, an operator on the pump installation floor 2 can insert a hose into the suction water tank 1 through the cleaning opening 121 to wash the cooling device 50 with water. Further, an operator on the pump installation floor 2 can insert the endoscope into the suction water tank 1 through the cleaning opening 121 and check the cooling device 50.

  In the present embodiment, the cooling device 50 is mounted on the fixed member 120. However, in one embodiment, the cooling device 50 may be suspended from the cooling medium circulation line 80.

  In one embodiment, the cooling system 200 may include a sacrificial anode, not shown. If the liquid in the suction water tank 1 contains salt, the pump 20 may corrode due to electrolytic corrosion. By attaching the sacrificial anode to a location of the cooling system 200 that is constantly in contact with the liquid in the suction water tank 1, the sacrificial anode is eroded earlier than the pump 20. As a result, the sacrificial anode can prevent pump 20 corrosion. An example of such a sacrificial anode is zinc.

  As the electrolytic corrosion of the sacrificial anode progresses, the sacrificial anode also needs to be replaced. Therefore, the sacrificial anode is desirably attached to a place that can be replaced when the cooling device 50 is lifted. In one example, the sacrificial anode is attached to the upper end of the inflow strut tube 53, the upper end of the outflow strut tube 54, or the cooling medium circulation line 80 that is constantly in contact with the liquid in the suction water tank 1. The configuration of the embodiment described with reference to FIGS. 9 and 10 can also be applied to each embodiment described with reference to FIGS.

  FIG. 11 is a schematic diagram showing still another embodiment of the pump system. The configuration related to the present embodiment, which is not particularly described, is the same as the embodiment described with reference to FIGS. As shown in FIG. 11, the main shaft 32 of the present embodiment extends vertically through the pump casing 27, and its lower end is located below the discharge bowl 24 and the impeller 31. The underwater bearing 41 is arranged below the discharge bowl 24 and the impeller 31 and supports the lower end of the main shaft 32. The underwater bearing 41 is fixed to the inner surface of the suction bell mouth 22 via a support member 41a. According to the present embodiment, the underwater bearing 41 can be easily inspected and replaced without lifting the pump 20 from the suction water tank 1.

  If dirt adheres to the heat transfer tube 51, the heat exchange efficiency decreases, so the cooling device 50 needs to be periodically cleaned. As an embodiment of a method of cleaning the cooling device 50, after the residual water in the suction water tank 1 is discharged by a submersible pump or the like (not shown), the worker enters the suction water tank 1 and uses the portable staircase 132 which can be carried out. A method of cleaning the device 50 may be used. It is also possible to check the corrosion state of the heat transfer tube 51, the inflow support tube 53, and the outflow support tube 54 when cleaning the cooling device 50, and by any chance, the heat transfer tube 51, the inflow support tube 53, and the outflow. Even when the support tube 54 is corroded, treatment can be performed in the suction water tank 1.

  As described above, in the embodiment shown in FIG. 11, it is possible to inspect and replace the underwater bearing 41 in the suction water tank 1 without lifting the pump 20 from the suction water tank 1, and further to clean and inspect the cooling device 50. It is possible to do. Therefore, maintenance can be facilitated and a highly reliable pump system can be provided. The above-described sacrificial anode may be directly attached to the pump casing 27. In the present embodiment, the sacrificial anode attached to the pump casing 27 can be replaced in order to clean and check the cooling device 50 in the suction water tank 1. The configuration of the embodiment described with reference to FIG. 11 can be applied to each embodiment described with reference to FIGS.

  FIG. 12 is a schematic diagram showing still another embodiment of the pump system. The configuration relating to the present embodiment, which is not particularly described, is the same as the embodiment described with reference to FIGS. 1 to 3, and thus redundant description will be omitted. As shown in FIG. 12, the pump 20 of the present embodiment is attached to the cleaning pipe 140 that branches off from the discharge pipe 34 and extends downward, the cleaning nozzle 142 connected to the tip of the cleaning pipe 140, and the cleaning pipe 140. The motor-operated valve 141 is further provided. The cleaning pipe 140 extends to near the heat transfer pipe 51 through the opening 5. The cleaning nozzle 142 is adjacent to the cooling device 50 and is arranged to face the heat transfer tube 51.

  When the electric valve 141 is opened, the liquid in the discharge pipe 34 is transferred to the cleaning nozzle 142 through the cleaning pipe 140, and is jetted from the cleaning nozzle 142 to the heat transfer pipe 51. As described above, the pump system of the present embodiment is configured to be able to clean the heat transfer tube 51 with the liquid in the discharge pipe 34. In one embodiment, the pump 20 may not include the motor-operated valve 141. In this case, the liquid in the discharge pipe 34 is always injected into the heat transfer pipe 51.

  In one embodiment, the difference between the temperature of the cooling medium immediately before flowing into the cooling device 50 and the temperature of the cooling medium immediately after flowing out of the cooling device 50 is measured by a thermometer (not shown), and the temperature difference tends to be small. Is found, the heat transfer tube 51 may be determined to be dirty, and the motor-operated valve 141 may be automatically opened.

  In one embodiment, the liquid in the discharge pipe 34 may be injected to the heat transfer pipe 51 by using the cutoff pressure at the time of starting or stopping the pump. Usually, the discharge valve 44 provided in the discharge pipe 34 is closed when the pump 20 starts or stops. The pressure in the discharge pipe 34 at this time is called a cutoff pressure. When the electric valve 141 is opened with the discharge valve 44 closed, the liquid in the discharge pipe 34 is transferred to the cleaning nozzle 142 through the cleaning pipe 140 and is jetted from the cleaning nozzle 142 to the heat transfer pipe 51. The configuration of the embodiment described with reference to FIG. 12 can be applied to each embodiment described with reference to FIGS.

  FIG. 13 is a schematic diagram showing still another embodiment of the pump system. The configuration related to the present embodiment, which is not particularly described, is the same as the embodiment described with reference to FIGS. The pump 20 shown in FIG. 13 is a so-called horizontal axis pump.

  The pump casing 27 extends from the outside to the inside of the suction water tank 1. The impeller casing 21 of the pump casing 27 is installed on the pump base 9. The pump casing 27 is bent and extends downward through the pump base 9 and the pump installation floor 2. One end of the pump casing 27 is located at a position lower than the lowest water level (LWL) of the suction water tank 1, and the other end is connected to a discharge pipe 34. The main shaft 32 extends horizontally through the pump casing 27. One end of the main shaft 32 is connected to the output shaft of the speed reducer 10, that is, the drive shaft 12a of the pump drive unit 12, and the other end is connected to an impeller (not shown) arranged in the pump casing 27. Also in the present embodiment, when the impeller is rotated by the pump driver 12, the liquid in the suction water tank 1 is sucked from the suction port 22a formed at the lower end of the pump casing 27.

  The second circulation line 82 and the fifth circulation line 85 of the present embodiment extend downward through the pump base 9 and the pump installation floor 2. The configuration of the embodiment described with reference to FIG. 13 can be applied to each embodiment described with reference to FIGS. 2 to 9 and FIG.

  The cooling device 50 of each embodiment described above is arranged so as to surround the outside of the pump casing 27, so that the configuration of the cooling system 200 can be simplified and the reliability of the cooling system 200 can be improved. Further, since the cooling device 50 is arranged at a position where the flow of the liquid in the suction water tank 1 is not hindered, the stable operation of the pump 20 can be performed without impairing the suction performance of the pump 20. Furthermore, since the outer diameter and the number of the heat transfer tubes 51 can be determined according to the flow rate of the cooling medium and the amount of heat exchanged, a sufficient heat exchange capacity can be secured, and the cooling device 50 can efficiently supply the cooling medium. Can be cooled.

  The above embodiments have been described for the purpose of enabling a person having ordinary knowledge in the technical field to which the present invention pertains to carry out the present invention. Naturally, those skilled in the art can make various modifications of the above embodiment, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the embodiments described, but is to be construed in its broadest scope in accordance with the spirit defined by the appended claims.

DESCRIPTION OF SYMBOLS 1 Suction water tank 2 Pump installation floor 5 Opening 6 Drive installation floor 8 Opening 9 Pump base 10 Reduction gear 10a Heat exchanger 11 Motor 11a Heat exchanger 12 Pump drive 12a Drive shaft 13 Stand 15 Connection shaft 17 Circulation pump 20 Pump 21 Impeller casing 22 Suction bell mouth 22a Suction port 24 Discharge bowl 25 Inner bowl 27 Pump casing 28 Pumping pipe 30 Discharge curved pipe 31 Impeller 32 Main shaft 33 Hanging pipe 34 Discharge pipe 35 Pump base 37 Guide vane 41 Underwater bearing 41a Support member 44 Discharge valve 45 Outer bearing 50 Cooling device 51 Heat transfer tube 53 Inflow support tube 54 Outflow support tube 57 First horizontal partition plate 58 Second horizontal partition plate 60 Vertical partition plate 61 First room 62 Second room 65 Cooling medium inlet 66 Cooling Medium outlet 69 Fixing member 71 Upper annular pipe 72 Lower annular pipe 74 Piping Holding member 80 Cooling medium circulation line 81 First circulation line 82 Second circulation line 83 Third circulation line 84 Fourth circulation line 85 Fifth circulation line 90 Expansion tank 93 Temperature control valve 100 In-pipe cooler 101 Flow path structure 102 Housing 105 Inflow header 106 Outflow header 110 Cooler heat transfer tube 120 Fixing member 121 Cleaning opening 125 Lifting opening 126 Chain block 126a Hook 128 Hanging balance 130 Ceiling crane 132 Portable stair 140 Cleaning piping 141 Motorized valve 142 Cleaning nozzle 200 Cooling system

Claims (18)

A pump system for pumping the liquid in the suction tank,
Spindle and
An impeller fixed to the main shaft,
A pump casing housing the impeller therein,
A pump driver connected to the main shaft to rotate the main shaft,
A heat exchanger fixed to the pump drive,
A cooling device arranged to surround the outside of the pump casing;
Comprising a cooling medium circulation line connected to the heat exchanger and the cooling device,
The cooling device includes a heat transfer tube communicating with the cooling medium circulation line,
The width of the cooling device is smaller than the diameter of the opening formed in the pump installation floor,
The upper end of the cooling device is located at a position lower than the lowest water level of the suction tank in which the pump can operate,
A pump system, wherein a lower end of the cooling device is located higher than a lower end of the pump casing. The cooling device further includes an inflow strut tube and an outflow strut tube arranged vertically,
The inflow strut tube has a plurality of first chambers arranged in a vertical direction inside thereof.
The outflow strut tube has a plurality of second chambers arranged along the vertical direction inside thereof.
One of any two vertically adjacent ones of the plurality of second rooms has a lower end located lower than the other upper end,
One of the plurality of first rooms has a cooling medium inlet connected to the cooling medium circulation line,
One of the plurality of second rooms has a cooling medium outlet connected to the cooling medium circulation line,
The heat transfer tube is a plurality of semi-annular heat transfer tubes extending horizontally,
The pump system according to claim 1, wherein the plurality of first rooms communicate with the plurality of second rooms through the plurality of heat transfer tubes, respectively. The inflow strut tube has a plurality of first horizontal partition plates arranged in a vertical direction therein, and the plurality of first chambers are partitioned by the plurality of first horizontal partition plates,
The outflow strut tube has a vertical partition plate extending in the vertical direction therein, and a plurality of second horizontal partition plates fixed to the vertical partition plate and arranged along the vertical direction, The plurality of second rooms are partitioned by the plurality of second horizontal partition plates and the vertical partition plate,
The pump system according to claim 2, wherein the plurality of second horizontal partition plates are alternately arranged on one side surface and the other side surface of the vertical partition plate. The cooling device further includes an inflow strut tube and an outflow strut tube arranged vertically,
The inflow strut tube has a plurality of first chambers arranged in a vertical direction inside thereof.
The outflow strut tube has a plurality of second chambers arranged along the vertical direction inside thereof.
One of the plurality of first rooms has a cooling medium inlet connected to the cooling medium circulation line,
One of the plurality of second rooms has a cooling medium outlet connected to the cooling medium circulation line,
The heat transfer tube extends spirally,
2. The pump system according to claim 1, wherein the plurality of first rooms communicate with the plurality of second rooms through the heat transfer tubes, respectively. 3. The cooling device further includes an upper annular pipe and a lower annular pipe,
The heat transfer tube is a plurality of heat transfer tubes extending in the vertical direction,
The upper annular pipe has a plurality of first chambers arranged along a circumferential direction thereof,
The lower annular pipe has a plurality of second chambers arranged along the circumferential direction,
The pump system according to claim 1, wherein the plurality of first rooms and the plurality of second rooms are alternately connected by the plurality of heat transfer tubes.   The pump system according to any one of claims 1 to 5, wherein the heat transfer tube has a polygonal cross section having a rounded vertex. A discharge pipe arranged downstream of the pump casing,
Further provided is an in-pipe cooler connected to the discharge pipe,
The said in-pipe cooler is provided with the flow-path structure connected to the said cooling-medium circulation line, and the housing which accommodates the said flow-path structure, The Claim 1 characterized by the above-mentioned. The described pump system.   The pump system according to any one of claims 1 to 7, wherein the cooling device is fixed to the pump casing via a gap.   The pump system according to any one of claims 1 to 8, wherein the cooling device is placed on a fixing member fixed to an outer peripheral surface of the pump casing. Further comprising an underwater bearing rotatably supporting the main shaft,
The main shaft extends vertically through the pump casing,
The pump system according to any one of claims 1 to 8, wherein the underwater bearing is arranged below the impeller. A cooling system for cooling a pump drive that rotates a main shaft of the pump,
A heat exchanger fixed to the pump drive,
A cooling device arranged to surround the outside of the pump casing of the pump,
Comprising a cooling medium circulation line connected to the heat exchanger and the cooling device,
The cooling device includes a heat transfer tube communicating with the cooling medium circulation line,
The width of the cooling device is smaller than the diameter of the opening formed in the pump installation floor,
The upper end of the cooling device is located at a position lower than the lowest water level of the suction tank in which the pump can operate,
A cooling system, wherein a lower end of the cooling device is located higher than a lower end of the pump casing. The cooling device further includes an inflow strut tube and an outflow strut tube arranged vertically,
The inflow strut tube has a plurality of first chambers arranged in a vertical direction inside thereof.
The outflow strut tube has a plurality of second chambers arranged along the vertical direction inside thereof.
One of any two vertically adjacent ones of the plurality of second rooms has a lower end located lower than the other upper end,
One of the plurality of first rooms has a cooling medium inlet connected to the cooling medium circulation line,
One of the plurality of second rooms has a cooling medium outlet connected to the cooling medium circulation line,
The heat transfer tube is a plurality of semi-annular heat transfer tubes extending horizontally,
The cooling system according to claim 11, wherein the plurality of first rooms communicate with the plurality of second rooms through the plurality of heat transfer tubes, respectively. The inflow strut tube has a plurality of first horizontal partition plates arranged in a vertical direction therein, and the plurality of first chambers are partitioned by the plurality of first horizontal partition plates,
The outflow strut tube has a vertical partition plate extending in the vertical direction therein, and a plurality of second horizontal partition plates fixed to the vertical partition plate and arranged along the vertical direction, The plurality of second rooms are partitioned by the plurality of second horizontal partition plates and the vertical partition plate,
The cooling system according to claim 12, wherein the plurality of second horizontal partitions are alternately arranged on one side and the other side of the vertical partition. The cooling device further includes an inflow strut tube and an outflow strut tube arranged vertically,
The inflow strut tube has a plurality of first chambers arranged in a vertical direction inside thereof.
The outflow strut tube has a plurality of second chambers arranged along the vertical direction inside thereof.
One of the plurality of first rooms has a cooling medium inlet connected to the cooling medium circulation line,
One of the plurality of second rooms has a cooling medium outlet connected to the cooling medium circulation line,
The heat transfer tube extends spirally,
The cooling system according to claim 11, wherein the plurality of first rooms communicate with the plurality of second rooms through the heat transfer tubes, respectively. The cooling device further includes an upper annular pipe and a lower annular pipe,
The heat transfer tube is a plurality of heat transfer tubes extending in the vertical direction,
The upper annular pipe has a plurality of first chambers arranged along a circumferential direction thereof,
The lower annular pipe has a plurality of second chambers arranged along the circumferential direction,
The cooling system according to claim 11, wherein the plurality of first rooms and the plurality of second rooms are alternately connected by the plurality of heat transfer tubes.   The cooling system according to any one of claims 11 to 15, wherein the heat transfer tube has a polygonal cross section having a rounded vertex. Further provided is an in-pipe cooler connected to a discharge pipe disposed downstream of the pump casing,
The said in-pipe cooler is provided with the flow path structure connected to the said cooling medium circulation line, and the housing which accommodates the said flow path structure, The Claim 1 characterized by the above-mentioned. The cooling system as described.   The cooling device is lifted up to the opening formed in the pump installation floor by an overhead crane installed at a pump station, a suspension balance attached to the overhead crane, and a chain block provided on the suspension balance. The cooling system according to any one of claims 11 to 17, wherein the cooling system is configured to be capable of being used.

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