JP5155113B2 - underwater pump - Google Patents

Description

  The present invention relates to a submersible pump used for pumping up and draining water from a place where water such as rain water and sewage is collected.

For example, submersible pumps are installed in sewage storage areas such as rainwater and sewage (hereinafter referred to as “sewage”) and collected in sewage pits and underground spaces. Used for draining to disposal facilities such as sewers. As such a submersible pump, what was described in patent document 1 is known, for example.
The submersible pump described in Patent Document 1 includes a water jacket in which water (cooling water) is sealed outside the motor frame, and includes an oil box and a pump casing that surround the lower bearing and the lower shaft seal device. A heat exchanger is arranged between them. This heat exchanger is provided with a cooling box in which cooling water is enclosed, and a partition-like cooling element that divides the space in the cooling box into an upper liquid chamber and a lower liquid chamber.

  Here, in the upper liquid chamber communicated with the water jacket, an impeller (circulation impeller) connected to the motor shaft is disposed, and the circulation impeller rotates integrally with the motor shaft. Water circulates between the upper liquid chamber and the water jacket by the action of the centrifugal pump. In the lower liquid chamber, sewage (pumped water) sucked up by an impeller (pumped impeller) circulates.

Thereby, in the submersible pump described in Patent Document 1, the heat of the cooling water flowing through the upper liquid chamber in the heat exchanger moves to the pumped water side flowing through the lower liquid chamber via the cooling element, and the cooling water flows upward. After cooling in the liquid chamber, it flows into the water jacket, and the cooling water efficiently cools the pump drive motor.
JP 2002-310088 A (paragraphs [0018] to [0028], FIGS. 4 to 8)

  However, the sewage contains a large amount of solid particles such as soil and gel-like substances such as pitch (hereinafter collectively referred to as “slurry component”), and the slurry component is dispersed or suspended in the sewage. When such sewage is pumped up using a submersible pump as described in Patent Document 1, the slurry component adheres to the inner wall of the lower liquid chamber in the heat exchanger, and the lower side The amount of slurry component adhering to the inner wall of the liquid chamber may increase over time.

  When the slurry component adheres to the inner wall of the lower liquid chamber, the thermal conductivity of such a slurry component is considerably lower than that of the material of the cooling element. As the efficiency decreases, the cross-sectional area of the pumped water flow path in the lower liquid chamber decreases, and the flow rate of pumped water in the lower liquid chamber decreases. As a result, the ability to cool the cooling water by the heat exchanger (heat exchange ability) is reduced, so that the motor is not sufficiently cooled, and the motor may be damaged or deteriorated due to the temperature rise.

The above problem is that a part of the pumped water sucked up by the pumped impeller is supplied directly to the inside of the water jacket, and this sewage is circulated inside the water jacket as cooling water to cool the motor. It can occur in the pump as well.
The object of the present invention is to take the above-mentioned facts into consideration, and the slurry component contained in the pumped water inside the heat exchange chamber in which the pumped water that performs heat absorption for the coolant that flows through the coolant chamber and cools the prime mover flows. It is in providing the submersible pump which can suppress effectively remaining.

  A submersible pump according to claim 1 of the present invention rotates a pumping impeller disposed in a pump chamber by torque transmitted from an electric motor, and sucks pumped water into the pump chamber through the suction port by the pumping impeller, and passes through a discharge port. A submersible pump that discharges pumped water in the pump chamber in a pressurized state, and is disposed on an outer peripheral side of an electric motor casing in which the electric motor is sealed, and a first cooling liquid in which a cooling liquid is sealed between the electric motor casing An outer cylinder member forming a chamber, and a second cooling in which a cooling liquid is enclosed and communicated with the first cooling liquid chamber through a liquid supply port and a liquid discharge port respectively opened in the first cooling liquid chamber A liquid chamber and a second cooling liquid chamber are disposed in the second cooling liquid chamber, and when the electric motor rotates, the cooling liquid in the second cooling liquid chamber is supplied to the first cooling liquid chamber through the liquid supply port. Adjacent to the second cooling liquid chamber through a circulation impeller for sucking the cooling liquid in the first cooling liquid chamber into the second cooling liquid chamber through the drain port and a heat exchangeable cooling partition wall. A part of the pumped water sucked into the pump chamber by the pumped impeller is supplied, and a heat exchange chamber in which the pumped water circulates, and a heat exchange chamber disposed in the pump chamber and transmitted from the electric motor. A crushing member that stirs the pumped water supplied from the pump chamber into the heat exchange chamber while rotating by the generated torque, and crushes the slurry component when the slurry component is contained in the pumped water. It is characterized by that.

  In the submersible pump according to claim 1, while the crushing member disposed in the heat exchange chamber rotates, the pumped water supplied from the pump chamber to the heat exchange chamber is stirred by the pumped impeller, and the slurry component is contained in the pumped water. If included, this slurry component is crushed. Thereby, even if the pumped water flowing through the heat exchange chamber contains a slurry component, the slurry component contained in the pumped water can be finely crushed by the crushing member, so that a relatively large size slurry component can be subdivided, It is possible to prevent the small-sized slurry component from growing due to coagulation and the like, and further, the slurry component subdivided by the stirring force given to the pumped water by the crushing member can be diffused or kept suspended in the pumped water. It can suppress effectively that the slurry component in it adheres to the inner wall of a heat exchange chamber.

As a result, according to the submersible pump according to claim 1, the slurry component adheres to the cooling partition that forms the inner wall of the heat exchange chamber, and the heat transfer through the cooling partition is hindered, or the slurry in the heat exchange chamber It can prevent effectively that the residual amount of a component increases and the flow volume of pumping water falls.
The submersible pump according to claim 2 of the present invention is the submersible pump according to claim 1, wherein the crushing member communicates the pump chamber with the heat exchange chamber, and a part of the pumped water in the pump chamber is It is arranged at a portion facing the communication port for supplying to the heat exchange chamber.

The submersible pump according to claim 3 of the present invention is the submersible pump according to claim 1 or 2, wherein, when the crushing member rotates, the crushing member feeds pumped water flowing through the heat exchange chamber to the outer peripheral side of the drive shaft of the electric motor. It is characterized by generating a swirling flow that swirls.
A submersible pump according to a fourth aspect of the present invention is the submersible pump according to any one of the first to third aspects, wherein the submersible pump is disposed at a portion of the outer peripheral surface of the drive shaft of the electric motor facing the second coolant chamber. A mechanical seal that rotates together with the drive shaft and seals between the drive shaft and the motor casing and the cooling partition wall is fitted.

  According to the submersible pump according to the present invention described above, the slurry contained in the pumped water inside the heat exchange chamber through which the pumped water that performs heat absorption with respect to the coolant that flows through the coolant chamber and cools the prime mover flows. It can suppress effectively that a component remains.

Hereinafter, a submersible pump according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration of a submersible pump according to an embodiment of the present invention in a sectional view along the axial direction. FIG. 2 shows a pump motor in the submersible pump shown in FIG. 1 and a shaft seal for the pump motor. A mechanism and a cooling mechanism are shown respectively. The submersible pump 10 according to the present embodiment is installed, for example, in sewage such as rainwater or sewage, and is installed in a water storage location such as a pit or underground space where the sewage is accumulated. In the following description, the sewage absorbed from the reservoir location into the submersible pump 10 is referred to as “pumped water W”.

As shown in FIG. 1, the submersible pump 10 is connected and fixed to a pump motor 12 housed in a sealed state in a substantially cylindrical motor casing 16 and a tip end portion of a drive shaft 14 of the pump motor 12. A centrifugal pumping impeller 18 is provided. The pump motor 12 is provided with a plurality of rotors 20 fixed to the outer peripheral side of the drive shaft 14 in the motor casing 16 and a plurality of stators 22 fixed to the inner peripheral side of the motor casing 16.
In the pump motor 12, the rotor 20 is connected to a motor power source (not shown) via a cable, a motor brush, and the like, and a rated drive current is supplied to the rotor 20 by this motor power source, thereby driving the drive shaft 14. Rotate at a predetermined rotation speed.

  The motor casing 16 includes a main body cylinder portion 24 formed in a substantially thin cylindrical shape that penetrates in the axial direction (arrow SD direction) along the axis C of the pump motor 12, and an upper end side of the main body cylinder portion 24 is provided. A substantially disc-shaped top plate 26 that is closed and a substantially disc-shaped bottom plate 28 that is closed on the lower end side of the main body cylinder portion 24 are provided. A cylindrical bearing box 30 is integrally formed on the top plate 26 at the center on the lower surface side, and a single row upper bearing 32 formed in an annular shape is inserted into the bearing box 30. It is fixed. The upper bearing 32 supports the upper end portion of the drive shaft 14 and connects the drive shaft 14 to the top plate 26.

  The bottom plate 28 of the motor casing 16 is provided with a circular connecting port 34 at the center thereof, and a cylindrical bearing box 36 with a bottom is provided with an annular sealing material (not shown) in the connecting port 34. It is fixed by press-fitting, screwing or the like. The bearing box 36 protrudes downward from the bottom plate 28, and a circular through hole 37 through which the drive shaft 14 passes is formed in the center of the bottom surface. A double-row lower bearing 38 formed in an annular shape is fitted and fixed in the bearing box 36, and the drive shaft 14 passes through the lower bearing 38 and the through hole 37 of the bearing box 36, and then the motor. Projecting downward from the inside of the casing 16. The lower bearing 38 supports an intermediate portion in the axial direction of the drive shaft 14 and connects the drive shaft 14 to the bearing box 36.

  As shown in FIG. 1, the submersible pump 10 is provided with a shaft sealing mechanism 40 for the drive shaft 14 that protrudes downward from the motor casing 16. The shaft seal mechanism 40 includes a shaft seal ring 42 that is fitted on the outer peripheral side of the drive shaft 14 and is in close contact with the lower end surface of the bearing housing 36. The shaft seal ring 42 seals the space between the outer peripheral surface of the drive shaft 14 and the inner peripheral surface of the through hole 37 so as to be in a liquid-tight state.

  The shaft sealing mechanism 40 includes a cylindrical mechanical seal 44 that is disposed on the lower side of the shaft sealing ring 42 and is fitted on the outer peripheral side of the drive shaft 14. The mechanical seal 44 is fixed to the outer peripheral surface of the drive shaft 14 so as to rotate integrally with the drive shaft 14. Further, the mechanical seal 44 is interposed between the shaft seal ring 42 and a seal frame portion 60 described later along the axial direction, and the upper end portion and the lower end portion thereof are respectively attached to the shaft seal ring 42 and the seal frame portion 60. Press contact.

  The upper end of the mechanical seal 44 is in pressure contact with the entire periphery of the lower end surface of the shaft seal ring 42. Thereby, the space between the through hole 37 of the bearing housing 36 and the drive shaft 14 is sealed by the shaft seal ring 42 and the mechanical seal 44 so as to be in a liquid-tight state. Here, the mechanical seal 44 is made of, for example, a resin material having a small frictional resistance and a slight elasticity, and has an upper end pressed against the shaft seal ring 42 so as to be slidable in the rotational direction. ing.

  In the submersible pump 10, a thin cylindrical outer cylinder member 46 is coaxially disposed on the outer peripheral side of the motor casing 16. Thereby, in the submersible pump 10, a cylindrical space is formed between the outer peripheral surface of the motor casing 16 and the inner peripheral surface of the outer cylinder member 46, and this cylindrical space is filled with a cooling liquid L described later. The first coolant chamber 48 is used. An annular connecting ring 50 is fixed to the upper end portion of the outer cylinder member 46, and this connecting ring 50 is fitted and fixed to the outer peripheral side of the circular convex portion 27 formed at the center of the upper surface of the top plate 26. ing. Thereby, the upper end portion of the outer cylinder member 46 is connected to the top plate 26 via the connection ring 50, and the upper end side of the first coolant chamber 48 is closed by the connection ring 50.

  In the submersible pump 10, an intermediate frame 52 formed in a substantially cylindrical shape as a whole is disposed below the outer cylinder member 46. The intermediate frame 52 is integrally formed with an annular flange portion 54 extending from the upper end portion to the outer peripheral side, and this flange portion 54 is connected and fixed to the lower end portion of the outer cylinder member 46. The intermediate frame 52 is integrally formed with a cooling partition wall 56 that divides the internal space of the intermediate frame 52 into upper and lower small spaces on the inner peripheral side thereof.

  The cooling partition wall 56 is formed in a bottomed mortar shape whose inner and outer diameters gradually decrease downward as a whole. Specifically, the cooling partition wall 56 is formed with a tapered portion 58 that extends from the axially intermediate portion of the inner peripheral surface of the intermediate frame 52 toward the inner peripheral side and is inclined downward, and this taper. A disc-shaped seal frame portion 60 that closes the lower end side of the portion 58 is integrally formed. A circular through hole 62 is formed in the center portion of the seal frame portion 60, and the lower end portion of the drive shaft 14 passes through the through hole 62.

  The submersible pump 10 is provided with a back cover 64 formed in a substantially disc shape below the intermediate frame 52. The back cover 64 closes the lower end side of the intermediate frame 52. Thereby, a space isolated from the outside is formed inside the intermediate frame 52. The space in the intermediate frame 52 is divided into upper and lower small spaces along the axial direction by the cooling partition wall 56.

Here, the small space on the upper side through the cooling partition wall 56 is a second cooling liquid chamber 61 filled with the cooling liquid L, and the small space on the lower side through the cooling partition wall 56 is a pump chamber 65 described later. And a heat exchange chamber 66 through which the pumped water W supplied from the pump chamber 65 circulates.
The intermediate frame 52 is formed with a pipe-shaped drain port 68 that penetrates the peripheral wall portion along the radial direction. The inner peripheral end (open end) of the drain port 68 is the upper end portion in the heat exchange chamber 66. Open near. A circular communication opening 70 is formed in the center of the back cover 64.

  On the other hand, as shown in FIG. 2, the pumped impeller 18 has a circular convex boss 72 formed at the center of the upper end, and the pumped impeller 18 is connected to the lower end of the drive shaft 14 via the boss 72. Coaxially connected and fixed to the part. The outer diameter of the boss portion 72 is slightly smaller than the inner diameter of the communication opening 70. The boss portion 72 is inserted through the central portion of the communication opening 70 and supported so that the center thereof coincides with the center of the communication opening 70. Thereby, an annular gap G is formed between the outer peripheral surface of the boss portion 72 and the inner peripheral surface of the communication opening 70.

  As shown in FIG. 1, the pump casing 74 is disposed in the submersible pump 10 below the intermediate frame 52 via the back cover 64. The pump casing 74 is formed in a thick cylindrical shape penetrating in the axial direction as a whole, and its upper end side is closed by a back cover 64 and its lower end side is closed by a substantially disc-shaped front cover 76. Thus, a cylindrical space that is flat in the axial direction partitioned from the outside is formed inside the pump casing 74, and the space in the pump casing 74 serves as a pump chamber 65.

  In the pump chamber 65, a rectifying unit 78 in the pumped impeller 18 and a plurality of blade portions 80 extending from the rectifying unit 78 to the outer peripheral side are rotatably accommodated. A water intake port 77 is opened at the center of the front cover 76, and the pump casing 74 has a discharge port (not shown) for pumped water W that is pressurized in the pump chamber 65 by the pumping impeller 18 on the outer peripheral side. (Omitted) is formed.

  The submersible pump 10 is connected with a bottomed cylindrical pump stand 82 on the lower side of the pump casing 74 via a front cover 76, and the pump stand 82 has a plurality of openings on the outer peripheral wall portion. 84 is formed. Here, the submersible pump 10 includes a control unit (not shown) for controlling the operation and stop of the pump motor 12 and, for example, a water level sensor (not shown). When the water level sensor detects that the water level at the water storage location is higher than the predetermined operating water level, the control unit of the submersible pump 10 operates the pump motor 12 and the water level sensor causes the water level at the water storage location to be lower than the operating water level. Then, the operation of the pump motor 12 is stopped. The working water level is set near the upper end of the pump casing 74, for example.

  As shown in FIG. 2, the upper end portion of the boss portion 72 of the pumped water impeller 18 projects into the heat exchange chamber 66 through the communication opening 70 of the back cover 64. Further, a thin diameter portion 15 having an outer diameter reduced with respect to the upper side is formed at the lower end portion of the drive shaft 14, and the small diameter portion 15 is located in the heat exchange chamber 66. A ring-shaped seal housing 86 is disposed in the heat exchange chamber 66, and the seal housing 86 is fitted on the outer peripheral side of the small diameter portion 15 and the boss portion 72. It rotates integrally with the boss part 72.

  A shaft sealing ring 88 is formed on the upper end side along the axial direction of the seal housing 86, and a crushing ring 90 having a larger inner and outer diameter than the shaft sealing ring 88 is formed coaxially on the lower end side. The shaft seal ring 88 is located on the outer peripheral side of the small diameter portion 15, and the crushing ring 90 is located on the outer peripheral side of the boss portion 72. The submersible pump 10 also includes a seal ring 91 that is inserted into the outer peripheral side of the small diameter portion 15.

  The seal ring 91 is made of, for example, a resin material having a small frictional resistance and a little elasticity. The upper end surface of the seal ring 91 is pressed against the lower surface side of the seal frame portion 60, and the lower end surface is directed to the upper surface side of the crushing ring 90. It is pressed and is in a slightly compressed state in the axial direction. As a result, the seal ring 91 seals the space between the inner peripheral surface of the through hole 62 and the outer peripheral surface of the drive shaft 14.

  The crushing ring 90 has a stirring protrusion 92 protruding from the outer peripheral surface thereof, and the stirring protrusion 92 is continuously or intermittently arranged on the outer peripheral surface of the crushing ring 90 along the circumferential direction. For example, the stirring protrusion 92 is formed in a protrusion shape such as a rectangular shape, a trapezoidal shape, or a triangular shape in plan view, and the crushing ring 90 rotates, so that the stirring protrusion portion 92 is localized in the pumped water W in the heat exchange chamber 66. A turbulent flow is generated at the same time, and a swirl flow FR swirling around the axis C as a whole is generated.

  As shown in FIG. 2, a partition member 94 formed in a substantially cylindrical shape as a whole is disposed on the inner peripheral side of the intermediate frame 52. In the partition member 94, a flange portion 96 extending in the circumferential direction is formed on the outer peripheral side over the entire circumference, and along the axial direction between both end portions along the circumferential direction of the flange portion 96. An extending collar 98 is formed. The collar portion 98 is formed in a substantially U shape whose cross-sectional shape is open toward the outer peripheral side in a plan view.

  Within the intermediate frame 52, the flange portion 96 has an outer peripheral end in close contact with the inner peripheral surface of the intermediate frame 52. The flange portion 98 has an upper end portion in close contact with the lower surface side of the bottom plate 28 and a pair of outer peripheral end portions in close contact with the inner peripheral surface of the intermediate frame 52. As a result, the second coolant chamber 61 is partitioned by the partition member 94 into the upper liquid chamber portion 104 and the lower liquid chamber portion 106 along the axial direction. A communication passage 99 penetrating in the axial direction is formed between the flange portion 98 and the inner peripheral surface of the intermediate frame 52.

  Further, the partition member 94 is formed with a tapered portion 108 that extends from the flange portion 96 and the flange portion 98 to the inner peripheral side and is inclined downward, and protrudes downward from the inner peripheral end of the tapered portion 108. The cylindrical portion 110 is integrally formed. Thereby, the second coolant chamber 61 is partitioned into the upper liquid chamber portion 104 and the lower liquid chamber portion 106 along the axial direction by the partition member 94, and the upper liquid chamber portion 104 and the lower liquid chamber 106 are separated. The chamber portion 106 communicates with each other through the inner peripheral side of the cylindrical portion 110.

  On the other hand, the outer peripheral end of the bottom plate 28 of the motor casing 16 is in close contact with the inner peripheral surface of the intermediate frame 52, whereby the first coolant chamber 48 is partitioned from the second coolant chamber 61 in the intermediate frame 52. doing. The bottom plate 28 is formed with a drainage port 100 that faces the flange 98 of the partition member 94 and penetrates in the axial direction, and feeds through the end on the opposite side to the drainage port 100 in the axial direction. A liquid port 102 is formed. Accordingly, the first coolant chamber 48 communicates with the space in the intermediate frame 52 through the drainage port 100 and the liquid supply port 102, respectively. At this time, the first coolant chamber 48 communicates with the upper liquid chamber portion 104 of the second coolant chamber 61 through the liquid supply port 102, and the lower side of the second coolant chamber 61 through the drain port 100 and the communication path 99. It communicates with the liquid chamber 106.

As described above, the first coolant chamber 48 and the second coolant chamber 61 are filled with the coolant L, respectively. When the cooling liquid L is sealed in the first cooling liquid chamber 48 and the second cooling liquid chamber 61, for example, the submersible pump 10 is connected to the cooling liquid L so that air does not enter the cooling liquid chambers 48 and 61. The cooling liquid L is poured into the cooling liquid chambers 48 and 61 while being immersed in the cooling liquid chamber.
As shown in FIG. 1, the submersible pump 10 includes a circulation impeller 112 that is fitted and fixed to the outer peripheral side of the mechanical seal 44. The circulation impeller 112 is formed with a ring-shaped boss portion 114 on the inner peripheral side, and a plurality of blade portions 116 extending integrally from the boss portion 114 to the outer peripheral side. The circulation impeller 112 is disposed on the inner peripheral side of the cylindrical portion 110 along the axial direction. The circulation impeller 112 rotates in one direction integrally with the mechanical seal 44 and the drive shaft 14. As a result, a flow of the cooling liquid L from the lower liquid chamber portion 106 toward the upper liquid chamber portion 104 is generated in the second cooling liquid chamber 61.

  Due to the upward flow of the cooling liquid L in the second cooling liquid chamber 61, a liquid pressure difference is generated between the upper liquid chamber section 104 and the lower liquid chamber section 106. The coolant L in the upper liquid chamber 104 thus formed flows into the first coolant chamber 48 through the liquid supply port 102, and moves upward while rotating around the axis C in the first coolant chamber 48. A flow of the spiral cooling liquid L is generated. As a result, the coolant L existing in the vicinity of the drainage port 100 in the first coolant chamber 48 flows back to the lower liquid chamber portion 106 through the drainage port 100. In order to efficiently generate the flow of the spoiled coolant L in the first coolant chamber 48, for example, the drain port 100 is formed with its central axis inclined tangential to the axial direction. You may make it do.

  In the submersible pump 10, the motor casing 16, the outer cylinder member 46, and the intermediate frame 52 are preferably formed of a metal material such as a copper alloy or stainless steel having relatively high thermal conductivity and high corrosion resistance against various liquids. Yes.

Next, the operation and action of the submersible pump 10 according to the present embodiment described above will be described.
As described above, the submersible pump 10 is basically installed at a water storage location where sewage is accumulated, but can also be used to pump up various liquids other than water. In addition, it can be installed and used at all times in water storage facilities such as sewage pits, and should be installed and used temporarily when draining sewage from facilities such as basements that have been flooded due to heavy rain, flooding, etc. Is also possible.

  In the submersible pump 10, when the water level at the reservoir location exceeds a predetermined working water level, the pump motor 12 rotates the drive shaft 14 in a predetermined rotation direction at a predetermined speed, and the pumping impeller 18 is integrated with the drive shaft 14. Rotates in the pump chamber 65. As a result, the sewage at the reservoir is sucked into the pump chamber 65 through the water inlet 77 as the pumped water W. Most of the pumped water W in the pump chamber 65 is discharged from a discharge port formed in the pump chamber 65 while being pressurized by the blade portion 80 rotating in one direction. A pipe made of an elbow, a hose, etc. is connected to the discharge port, and the pumped water W is drained to a drainage facility such as a sewer through the pipe.

In the submersible pump 10, when the pumped impeller 18 rotates in the pump chamber 65, a part of the pumped water W sucked into the pump chamber 65 is connected to the communication opening 70 (gap G) opened on the back side of the pumped impeller 18. Through the heat exchange chamber 66. At this time, the crushing ring 90 disposed facing the gap G also rotates integrally with the drive shaft 14.
Thereby, the crushing ring 90 gives a stirring force to the pumped water W flowing into the heat exchange chamber 66 by the stirring protrusion 92. Due to this stirring force, a local turbulent flow is generated in the pumped water W in the vicinity of the outer periphery of the stirring protrusion 92, and a swirling flow FR (see FIG. 2) that rotates around the outer peripheral side of the crushing ring 90 is generated.

  By generating the swirl flow FR in the heat exchange chamber 66, a part of the pumped water W becomes a laminar flow that flows along the cooling partition wall 56, and the cooling liquid L that flows in the lower liquid chamber portion 106 through the cooling partition wall 56. Heat exchange (endothermic) efficiently. In the submersible pump 10, the same amount of pumped water W as the pumped water W that flows in through the gap G is discharged from the heat exchange chamber 66 to the outside (water storage location) through the drain port 68.

  In the submersible pump 10, the circulating impeller 112 rotates in the second cooling liquid chamber 61, so that the cooling liquid L in the first cooling liquid chamber 48 passes through the drain port 100 and is below the second cooling liquid chamber 61. The liquid flows into the liquid chamber 106. Since the heat of the coolant L that has cooled the pump motor 12 moves to the pumped water W flowing through the heat exchange chamber 66 through the cooling partition wall 56, the coolant L is efficiently cooled in the lower liquid chamber portion 106. . The cooling liquid L cooled in the lower liquid chamber section 106 is sent to the upper liquid chamber section 104 by the circulation impeller 112 and flows into the first cooling liquid chamber 48 from the upper liquid chamber section 104 through the liquid supply port 102. To do. As described above, the coolant L flows in a spiral flow through the first coolant chamber 48 and then returns to the lower liquid chamber 106 through the drain port 100.

  At this time, the heat generated by the pump motor 12 moves to the coolant L flowing through the first coolant chamber 48 through the main body cylinder portion 24. Part of the heat transferred to the coolant L is radiated to the outside of the submersible pump 10 through the outer cylinder member 46 when the first coolant chamber 48 flows. Further, most of the remaining heat transferred to the cooling liquid L is transferred to the pumped water W flowing through the heat exchange chamber 66 through the cooling partition wall 56 during the circulation of the second cooling liquid chamber 61 and discharged together with the pumped water W to the outside of the apparatus. Is done.

Therefore, the pump motor 12 is efficiently and reliably cooled by the coolant L during its rotation, so that an excessive temperature rise does not occur due to heat accumulation of generated heat. As a result, in the submersible pump 10, since an excessive temperature rise is prevented from occurring in the pump motor 12, it is possible to prevent the pump motor 12 from being thermally deteriorated or damaged.
In the submersible pump 10 according to the present embodiment, when a part of the pumped water W sucked into the pump chamber 65 flows into the heat exchange chamber 66 through the communication opening 70 (gap G), the pumped water W is crushed. The ring 90 stirring protrusion 92 provides stirring force. Due to this stirring force, a strong local turbulent flow is generated in the pumped water W in the vicinity of the stirring protrusion 92 and a swirl flow FR that swirls around the outer peripheral side of the crushing ring 90 is generated. As a result, a part of the pumped water W flowing in the heat exchange chamber 66 becomes a laminar flow that flows along the cooling partition 56, and is efficient between the cooling liquid L that flows in the lower liquid chamber 106 through the cooling partition 56. Heat exchange (endothermic) is performed.

  In addition, in the submersible pump 10, when the pumped water W includes a slurry component S made of fine solid particles or gel, the pumped water W flows into the heat exchange chamber 66 with respect to the slurry component S. A stirring force and an impact force associated with a collision with the stirring protrusion 92 act by the stirring protrusion 92, respectively. Thereby, when the slurry component S with a large size is contained in the pumped water W, the slurry component S can be crushed and subdivided by the stirring force and the impact force from the stirring protrusion 92, so that the slurry component S is It can prevent effectively that it flows in into the heat exchange chamber 66 with a large size, and this precipitates.

  Further, in the submersible pump 10, the agitation force acts on the pumped water W and the slurry component S that flow into the heat exchange chamber 66 by the agitation protrusion 92, so that the slurry component S aggregates and grows in the heat exchange chamber 66. This can be effectively prevented, and it is also possible to prevent the slurry component S suspended or uniformly diffused in the pumped water W from being deposited, so that the grown slurry component S is precipitated in the heat exchange chamber 66, The slurry component S deposited from the pumped water W can be effectively prevented from sticking to the inner wall portion of the heat exchange chamber 66.

As a result, according to the submersible pump 10 according to the present embodiment, the slurry component S adheres to the cooling partition 56 that forms part of the inner wall of the heat exchange chamber 66, and the pumped water W and the coolant L that have passed through the cooling partition 56. It is possible to effectively prevent the heat transfer from being hindered, the residual amount of the slurry component S in the heat exchange chamber 66 from increasing, and the flow rate of the pumped water W from decreasing with time.
In the present embodiment, as the cooling liquid L sealed in the cooling liquid chambers 48 and 61, clean water is used in consideration of cooling performance (heat transfer coefficient) and lubricity with respect to the mechanical seal 44, etc. Besides this, fresh water, oil, etc. mixed with antifreeze can also be used as the cooling liquid L.

It is sectional drawing along the axial direction which shows the structure of the submersible pump which concerns on embodiment of this invention. It is sectional drawing along the axial direction which shows the structure of the pump motor in the submersible pump shown by FIG. 1, the shaft sealing mechanism with respect to a pump motor, and a cooling mechanism.

Explanation of symbols

10 Submersible pump 12 Pump motor (electric motor)
14 Drive shaft 15 Small diameter portion 16 Motor casing (motor casing)
DESCRIPTION OF SYMBOLS 18 Pumped impeller 20 Rotor 22 Stator 24 Main body cylinder part 26 Top plate 27 Convex part 28 Bottom plate 30 Bearing box 32 Upper side bearing 34 Connection port 36 Bearing box 37 Through-hole 38 Lower side bearing 40 Shaft sealing mechanism 42 Shaft sealing ring 44 Mechanical seal 46 Outside Cylindrical member 48 First coolant chamber 50 Connecting ring 52 Intermediate frame 54 Flange portion 56 Cooling partition wall 58 Tapered portion 60 Seal frame portion 61 Second coolant chamber 62 Through hole 64 Back cover 65 Pump chamber 66 Heat exchange chamber 68 Drain port 70 Communication opening 72 Boss part 74 Pump casing 76 Front cover 77 Water inlet 78 Rectification part 80 Blade part 82 Pump stand 84 Opening part 86 Seal housing 88 Shaft seal ring 90 Crushing ring (crushing member)
91 seal ring 92 stirring protrusion 94 partition member 96 flange portion 98 flange 99 communication path 100 drainage port 102 liquid supply port 104 upper liquid chamber portion 106 lower liquid chamber portion 108 taper portion 110 cylindrical portion 112 circulating impeller 114 boss Part 116 Blade part G Gap L Coolant S Slurry component W Pumped water

Claims (4)

The pumped impeller disposed in the pump chamber is rotated by torque transmitted from the electric motor, and pumped water is sucked into the pump chamber through the suction port by the pumped impeller, and the pumped water in the pump chamber is discharged in a pressurized state through the discharge port. A submersible pump,
An outer cylinder member that is disposed on the outer peripheral side of an electric motor casing that seals the electric motor, and forms a first cooling liquid chamber in which the cooling liquid is sealed between the electric motor casing,
A second coolant chamber that is sealed with the coolant and communicates with the first coolant chamber through a liquid supply port and a drain port that respectively open into the first coolant chamber;
When the electric motor is rotated, the coolant in the second coolant chamber is supplied to the first coolant chamber through the liquid supply port, and is passed through the drain port. A circulating impeller for sucking the coolant in the first coolant chamber into the second coolant chamber;
A part of the pumped water sucked into the pump chamber is supplied by the pumping impeller, and the pumped water passes through the inside through a cooling partition wall that can exchange heat. A circulating heat exchange chamber;
When the pumping water supplied from the pump chamber to the heat exchange chamber is agitated while being rotated by the torque transmitted from the electric motor, and the slurry component is contained in the pumped water. A crushing member for crushing the slurry component;
Submersible pump characterized by having. The crushing member is disposed at a portion facing a communication port for communicating the pump chamber with the heat exchange chamber and supplying a part of pumped water in the pump chamber to the heat exchange chamber. Item 1. A submersible pump according to item 1. 3. The submersible pump according to claim 1, wherein the crushing member generates a swirling flow that swirls the outer peripheral side of the drive shaft of the electric motor in the pumped water flowing in the heat exchange chamber when rotating. A portion of the outer peripheral surface of the drive shaft of the electric motor that faces the second coolant chamber rotates together with the drive shaft, and between the drive shaft and the motor casing and the cooling partition wall, respectively. The submersible pump according to any one of claims 1 to 3, wherein a mechanical seal for sealing is inserted.

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