JP2008267215A - Pump facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump facility with simple structure, surely preventing foreign matters from being caught into a pump. <P>SOLUTION: A water pump 4 disposed in a pump chamber 3 comprises; a pump body 8 connected to a suction pipe 5 on a suction tank 2 side and a discharge pipe 7 on a discharge tank 6 side; and a submersible motor 9 disposed integrally with an upper part of the pump body 8. In a heat exchanger 21, heat exchange between primary cooling water sealed in a water jacket 29 of the submersible motor 9 and pumped water as secondary cooling water is performed. A rotary blade 42 for cutting foreign matters is disposed on a back face side of a main plate 12a of an impeller 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pump facility used for sewage water supply and the like.

  Conventionally, for example, Patent Document 1 discloses a pump facility such as a sewage water supply in which a vertical shaft pump and a submersible motor for driving the vertical pump are arranged in a pump chamber. When a normal motor that is not a submersible motor is used as a driving motor for the vertical shaft pump, it is necessary to install the motor on the installation floor above the pump chamber in order to prevent the motor from being submerged, and the equipment becomes large. In particular, when the motor is placed at a high position, a plurality of intermediate floors are provided between the pump chamber and the motor installation floor, and each intermediate floor is supported to support the intermediate shaft that connects the output shaft of the motor and the main shaft of the pump. It is necessary to provide an intermediate bearing. As a result, the equipment becomes larger and the construction cost increases. If the vertical shaft pump is driven by a submersible motor like the one described in Patent Document 1, an installation floor and an intermediate floor are not required, so that the equipment can be downsized and simplified. Patent Document 2 discloses a configuration in which a submersible motor pump in which a dry submersible motor and a pump main body are integrated is arranged in a pump chamber outside a pit (Patent Document 2).

  However, the pump equipment described in Patent Document 1 has a complicated equipment structure in that it includes a conduit for circulating the cooling water of the submersible motor, a pressure pump, and the like. The pump facility described in Patent Document 2 employs a structure in which the primary cooling water circulated in the submersible motor is cooled by pumping water using a heat exchanger disposed between the casing of the submersible motor and the pump casing. Therefore, it is necessary to introduce the pumped water into the narrow gap between the rear surface of the impeller and the heat exchanger. Therefore, if there is a large inflow of foreign matter (especially plant-like string-like foreign matters) in the pumped water, foreign matter may be caught in the gap, and the impeller may become entangled inside the impeller or on the rotating shaft. Impedes driving.

JP 2003-120571 A JP 2002-310088 A

  It is an object of the present invention to provide a pump facility that has a relatively simple structure and that can reliably prevent biting and entanglement of foreign substances contained in pumped water.

  The present invention includes a water absorption tank for storing pumped water, a pump chamber provided adjacent to the water absorption tank, one end connected to the water absorption tank, and the other end located in the pump chamber, and one end A pump body located in the pump chamber, the other end of which is connected to the drainage side, a pump main body comprising a vertical pump having a suction port connected to the suction pipe and a discharge port connected to the discharge pipe; A submersible motor for driving the pump provided integrally with the top of the pump main body and having an impeller of the pump main body attached to the rotating shaft, and sucking the pumped water in the water absorption tank from the suction pipe A submersible pump for discharging to a discharge pipe, wherein the submersible pump is provided between a water jacket provided outside a motor casing of the submersible motor, the submersible motor and the pump body, and the motor casing. Primary cooling water sealed in a cooling water space formed between the water jacket and the water jacket is introduced to the upper side, and the pumped water is introduced to the lower side as secondary cooling water from the rear side of the impeller. And a rotary blade provided on the back side of the impeller facing the pump casing of the pump body.

  The pump chamber is submerged by adopting a submersible pump that integrates the submersible motor and the pump body and has a heat exchanger that exchanges heat between the primary cooling water and the secondary pumping water in the cooling water space of the submersible motor. Even so, heat dissipation of the submersible pump is ensured and continuous operation is possible. Therefore, it is not necessary to provide a motor installation floor or intermediate floor separately from the pump chamber, and all devices such as a submersible pump and a pump body can be installed in the pump chamber. In this respect, the pump equipment of the present invention has a simple structure. Moreover, construction costs can be reduced by consolidating the water tank and pump room in the basement.

  Contaminants in the pumped water flowing from the gap between the back side of the impeller and the pump casing to the heat exchanger by the rotary blade provided on the back side of the impeller of the submersible pump (especially spider-like impurities such as plants) Can be crushed. Therefore, it is possible to prevent the foreign matter from getting caught in the gap between the rear surface side of the impeller and the pump casing and the entanglement of the foreign matter inside the impeller and the rotating shaft.

  Suitably, the said submersible pump is further equipped with the fixed blade provided in the site | part facing the said rotary blade of the said pump casing.

  By providing a fixed blade on the pump casing side, impurities in the pumped water can be crushed by being sandwiched between the rotary blade and the fixed blade, so that it is possible to more reliably prevent the inclusion of impurities and entanglement.

  Specifically, one of the rotating blade and the fixed blade is a convex blade, and the other is a concave blade.

  As an alternative, both the rotary blade and the fixed blade are convex blades.

  As another alternative, both the rotary blade and the fixed blade are concave blades.

  The pump facility according to the present invention employs a submersible pump that integrates a submersible motor and a pump main body and includes a heat exchanger for pumping water as primary cooling water and secondary pumping water in a cooling water space of the submersible motor. There is no need to provide a motor installation floor or intermediate floor separately from the chamber, and all equipment such as submersible pumps and pump bodies can be installed in the pump chamber, and the structure of the equipment is simple. Moreover, in the pump installation of this invention, since the rotary blade is provided in the back side of the impeller of a submersible pump, it can prevent reliably that a foreign material etc. which are contained in pumping up are bitten and entangled.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  Referring to FIG. 1, the pump facility 1 includes a water absorption tank 2 that stores, for example, sewage or pumped water such as sewage, and a pump chamber 3 that is adjacent to the water absorption tank 2 with a partition wall therebetween. The water absorption tank 2 and the pump chamber 3 are installed in the basement. A submersible pump 4 is disposed in the pump chamber 3. Further, a suction pipe 5 having one end connected to the water absorption tank 2 and the other end located in the pump chamber 3 is provided. Furthermore, a discharge pipe 7 having one end located in the pump chamber 3 and the other end connected to a drainage tank (drainage side) 6 is provided.

  Referring to FIGS. 2 and 3 together, the submersible pump 4 of the present embodiment is a motor-integrated pump including a pump body 8 and a submersible motor 9. The pump body 8 is a vertical spiral spiral flow type, and the suction port 37 a is connected to the suction pipe 5 and the discharge port 38 a is connected to the discharge pipe 7. A submersible motor 9 for driving the pump is integrally provided on the upper portion of the pump body 8. The lower end side of the motor shaft (rotating shaft) 11 of the submersible motor 9 extends to the vicinity of the suction port 37a of the pump body 8, and an impeller (impeller) 12 is attached. The pumped water in the water absorption tank 2 is sucked into the pump body 8 from the suction pipe 5, discharged to the discharge pipe 7 by the pump body 8, and sent to the drain tank 6.

  Hereinafter, the submersible pump 4 (submersible motor 9 and pump body 8) will be described with reference to FIGS.

  The motor casing 13 of the submersible motor 9 is filled with air (dry type), and the upper end side of the motor shaft (rotating shaft) 11 extending in the vertical direction is accommodated. The motor shaft 11 is rotatably supported by bearings 14A and 14B disposed in the motor casing 13. Further, a rotor 15 is fixed to the motor shaft 11, and a stator 16 is disposed so as to face the rotor 15.

  The lower end opening of the motor casing 13 is sealed with an oil box 17. The oil box 17 includes a box upper portion 17a and a box lower portion 17b that seals a lower end opening of the box upper portion 17a, and an oil chamber 18 in which lubricating oil is sealed is formed.

  The oil box 17 seals the upper end opening of the cooling water box 19 which is a substantially flat cylindrical shape. On the other hand, the lower end opening of the cooling water box 19 is sealed on the upper surface side of the heat exchanger 21 that is generally disk-shaped, and a cooling water chamber 22 that encloses the primary cooling water is formed inside the cooling water box 19. Has been. The lower surface side of the heat exchanger 21 is attached to the pump casing 36 of the pump body 8 and communicates with the inside of the pump casing 36 as described in detail later.

  4A together, a large number of arc-shaped heat transfer fins 21a are provided on the lower surface side of the heat exchanger 21, and a labyrinth shape is formed by these heat transfer fins 21 and a wear protector 39 described later. A bent secondary cooling water passage 23 is formed. As shown in FIG. 4B, each heat transfer fin 21a may have a bent shape. Similarly, a large number of arc-shaped or bent heat transfer fins 21b are also provided on the upper surface side of the heat exchanger 21, and a labyrinth shape is formed by the heat transfer fins 21b and the lower surface of the box lower portion 17b (oil box 17). In addition, a bent primary cooling water passage 24 is formed.

  The heat exchanger 21 is formed with a port 21c that communicates with the primary cooling water path 24. The port 21c has an air vent line 25, a pumping return line 26, and an external water injection line, each of which is provided with a gate valve. It is connected to the pipe line 27.

  The lower end side of the motor shaft 11 extends through the oil box 17 (oil chamber 18), the cooling water box 19 (cooling water chamber 22), and the heat exchanger 21 to the inside of the pump casing 36, and the impeller 12 is fixed. Has been. In the oil chamber 18, there is an upper shaft seal device 28 </ b> A that seals between the motor casing 13 and the air and the lubricating oil in the oil chamber 18, and between the lubricating oil and the primary cooling water in the cooling water chamber 22. Is arranged. The cooling water chamber 22 is provided with a lower shaft seal device 28B that seals between the primary cooling water and the pumped water.

  A water jacket 29 surrounding the outside of the motor casing 13 is provided. A thick cylindrical cooling water space 31 is formed between the outer peripheral surface of the motor casing 13 and the inner peripheral surface of the water jacket 29. The cooling water space 31 is connected to the cooling water chamber 22 in the cooling water box 19 by a cooling water outlet pipe 32 and a cooling water inlet pipe 33. A circulation blade 34 is attached to a portion of the motor shaft 11 located in the cooling water chamber 22.

  The pump casing 36 of the pump body 8 is configured by a suction casing 37 having a vent shape and having a suction port 37a at one end, and an impeller casing 38 having the other end of the suction casing 37 connected to the lower portion and having a discharge port 38a. ing. The impeller 12 is disposed in the impeller casing 38. The impeller 12 includes a boss portion 12a fixed to the motor shaft 11, a main plate 12b extending from the boss portion 12a, and a plurality of blades 12c extending from the main plate 12b.

  Referring also to FIG. 5, a circular upper opening 38 b is formed in the upper portion of the impeller casing 38 that faces the main plate 12 b of the impeller 12. A wear protector 39 bolted to the lower surface side of the heat exchanger 21 is disposed in the upper opening 38b. The wear protector 39 is generally annular, and a circular hole 39a is formed at the center. The lower end side of the motor shaft 11 extends into the impeller casing 38 through the circular hole 39a. In addition, a seal member 41 is attached to the outer peripheral edge of the wear protector 39 to ensure watertightness with the peripheral wall of the circular hole 39a. A gap for ensuring the rotation of the impeller 12 is provided between the lower surface of the wear protector 39 and a portion of the back side of the main plate 12b of the impeller 12 near the rear end of the blade 12c. The interior of the impeller casing 38 communicates with the secondary cooling water passage 23 of the heat exchanger 21 through this gap and the circular hole 39a of the wear protector 39.

  During the pump operation, the primary cooling water in the cooling water space 31 in the water jacket 29 flows into the cooling water chamber 22 through the cooling water outlet pipe 32 by the rotation of the circulation blade 34 and is introduced into the upper surface side of the heat exchanger 21. Is done. The primary cooling water flows from the inside toward the outside through the primary cooling water passage 24 of the heat exchanger 21, and then returns to the cooling water chamber 22 through the cooling water inlet pipe 33. In other words, the primary cooling water circulates between the cooling water space 31 in the water jacket 29 and the heat exchanger 21. On the other hand, part of the pumped water discharged from the rear end side of the blade 12c of the impeller 12 to the discharge port 38a passes through the gap between the main plate 12b and the wear protector 39 to the back side of the main plate 12b, and further the wear protector. It is introduced into the lower surface side of the heat exchanger 21 through the 39 circular holes 39a. This pumped water flows from the inside toward the outside through the secondary cooling water passage 23 of the heat exchanger 21. Therefore, the heat generated in the submersible motor 9 is transmitted from the primary cooling water (primary cooling water path 24) to the pumped water (secondary cooling water path 23) as secondary cooling water in the heat exchanger 21, and as a result, the submersible motor 9 is cooled.

  In the pump facility 1 of the present embodiment, the heat exchanger that integrates the submersible motor 9 and the pump main body 8 and exchanges heat between the primary cooling water and the secondary cooling water in the cooling water space 31 of the submersible motor 9. By adopting the submersible pump 4 provided with 21, the heat radiation of the submersible pump 4 is ensured regardless of whether the operation is in the air or underwater, and continuous operation is possible. In other words, even if the pump chamber 3 is submerged, heat dissipation of the submersible pump 4 is ensured and continuous operation is possible. Therefore, it is not necessary to provide a motor installation floor or intermediate floor separately from the pump chamber 3, and all devices such as a submersible pump and a pump body can be installed in the pump chamber. In this respect, the pump equipment 1 of the present invention has a simple structure. Moreover, a construction cost can be reduced by consolidating the water absorption tank 2 and the pump chamber 3 in the basement.

  Next, referring to FIG. 3, FIG. 5, FIG. 6 (A), FIG. 6 (B), and FIG. 7 (A), impurities contained in the pumped water (especially string-like impurities such as plants). A mechanism for crushing will be described.

  On the outer peripheral edge corresponding to the rearmost end of the blade 12c on the back side of the main plate 12b of the impeller 12, a plurality of rotary blades 42 each including a convex blade protruding upward are provided. As shown in FIG. 6 (B), the individual rotary blades 42 are spaced from each other along the outer peripheral edge of the main plate 12b that is circular in plan view, and generally have an arc shape in plan view. Further, as shown in FIGS. 5 and 6A, an accommodation groove 39b (annular in a plan view or a bottom view) is provided on the lower surface of the wear protector 39, and the rotary blade 42 accommodates the accommodation groove 39b. It arrange | positions in the groove | channel 39b. Specifically, each rotary blade 42 is opposed to the side wall and the bottom wall of the accommodation groove 39b with a slight gap. In the present embodiment, the rotation direction of the impeller 12 is clockwise (see arrows in FIGS. 6B and 7A) in plan view, and the surface on the tip side in the impeller rotation direction of each rotary blade 42 is The rotation side cut surface 42a is constituted.

  On the other hand, on the wear protector 39 side, there are provided a plurality of fixed blades 43 made of concave blades which are located on the outer peripheral edge side and opposed to the impeller side rotary blade 42. Specifically, the individual fixed blades 43 are formed by providing recesses on the outer side walls of the receiving grooves 39 b on the lower surface of the wear protector 39. As shown in FIG. 6B, the individual fixed blades 43 are provided at intervals along the outer edge of the main plate 12b, and have a generally arc shape in plan view. Further, the surface on the tip side in the impeller rotation direction of each fixed blade 43 constitutes a fixed-side cut surface 43a.

  As described above, during pump operation, part of the pumped water discharged from the rear end side of the blade 12c of the impeller 12 passes through the gap between the main plate 12b and the wear protector 39 to the back side of the main plate 12b. There may be a case where a contaminant 44 (schematically shown in FIG. 6B) is included. The rotary blade 42 provided on the impeller 12 rotates with the rotation of the motor shaft 11, while the fixed blade 43 provided on the wear protector 39 is fixed without rotating. The impurities 44 contained in the pumped water described above are sandwiched between the rotation-side cutting surface 42a of the rotary blade 42 and the fixed-side cutting surface 43a of the fixed blade 43, and are cut and crushed. As a result, it is possible to prevent the impurities 44 from getting caught in the gap between the main plate 12b of the impeller 12 and the wear protector 39, and entanglement of the impurities 44 inside the impeller 12 or the motor shaft 11.

  Referring to FIG. 7A, the rotation-side cut surface 42a of the rotary blade 42 in this embodiment is inclined with respect to the rotation direction of the impeller 12 (see the arrow), but in the same direction as the motor shaft 11 (vertical). Direction). On the other hand, the fixed-side cut surface 43 a of the fixed blade 43 in the present embodiment is perpendicular to the rotation direction of the impeller 12 and extends in the same direction (vertical direction) as the motor shaft 11. 7B and 7C show other examples of combinations of inclinations of the rotation-side cut surface 42a and the fixed-side cut surface 43a. 7B and 7C, the inclination of the fixed-side cut surface 43a is the same as that of the present embodiment (FIG. 7A). In the example shown in FIG. 7B, the rotation-side cut surface 42a is inclined with respect to both the rotation direction of the impeller 12 and the direction of the motor shaft 11 (vertical direction), and the rotation-side cut surface 42a and the fixed-side cut surface. An angle is schematically shown between 43a and 43a. In the example shown in FIG. 7C, the rotation-side cut surface 42 a is perpendicular to the rotation direction of the impeller 12 and extends in the same direction (vertical direction) as the motor shaft 11.

  8 to 11 show a first alternative of the rotary blade 42 and the fixed blade 43. Referring to FIG. 8, in this first alternative, both the rotary blade 42 and the fixed blade 43 are convex blades. The fixed blade 43 protrudes downward from the lower surface of the wear protector 39 and has the same shape as the rotary blade 42 except that the direction of protrusion is upside down. The surface on the impeller rotation direction front end side of the rotary blade 42 and the impeller rotation direction rear end side surface of the fixed blade 43 constitute a rotation side cut surface 42a and a fixed side cut surface 43a, respectively.

  In the configuration of FIG. 8, as shown in FIG. 9, both the rotary side cut surface 42 a and the fixed side cut surface 43 a are inclined with respect to the rotation direction of the impeller 12 (see the arrow). It extends in the same direction. FIGS. 10A to 11B show other examples of combinations of inclinations of the rotation-side cut surface 42a and the fixed-side cut surface 43a. In the example of FIG. 10A, both the rotation-side cutting surface 42a and the fixed-side cutting surface 43a are inclined with respect to the impeller rotation direction and the direction in which the motor shaft 11 extends, and an angle θ is formed between them. ing. In the example of FIG. 10B, the rotation-side cutting surface 42a is inclined with respect to the impeller rotation direction and the direction in which the motor shaft 11 extends, while the fixed-side cutting surface 43a is inclined with respect to the impeller rotation direction. Extends in the same direction as the motor shaft 11 (there is an angle θ). In the example of FIG. 10C, the rotation side cut surface 42a is inclined with respect to the impeller rotation direction but extends in the same direction as the motor shaft 11, and the fixed side cut surface 43a is perpendicular to the impeller rotation direction. And extends in the same direction as the motor shaft 11. In the example of FIG. 11A, the rotation-side cut surface 42a is inclined with respect to the impeller rotation direction and the direction in which the motor shaft 11 extends, and the fixed-side cut surface 43a is perpendicular to the impeller rotation direction and the motor shaft. 11 extends in the same direction as that (there is an angle θ). In the example of FIG. 11B, both the rotation-side cut surface 42a and the fixed-side cut surface 43a are perpendicular to the impeller rotation direction and extend in the same direction as the motor shaft 11.

  12 and 13 show a second alternative of the rotary blade 42 and the fixed blade 43. FIG. In this second alternative, the rotary blade 42 is a concave blade and the fixed blade 43 is a convex blade. The rotary blade 42 is provided at a portion where the outer peripheral surface and the rear surface of the main plate 12b of the impeller 12 meet and is formed of a concave groove having an arc shape in plan view with an upper portion and a lower portion opened. The fixed blade 43 protrudes downward from the lower surface of the wear protector 39. The surfaces on the rear end side in the impeller rotation direction of the rotary blade 42 and the fixed blade 43 constitute a rotary side cut surface 42a and a fixed side cut surface 43a, respectively.

  In the configuration of FIG. 12, as shown in FIG. 13A, the rotation-side cut surface 42a is perpendicular to the impeller rotation direction and extends in the same direction as the motor shaft 11, and the fixed-side cut surface 43a rotates the impeller. Although inclined with respect to the direction, it extends in the same direction as the motor shaft 11. FIG. 13A and FIG. 13B show another example of a combination of inclinations of the rotation-side cut surface 42a and the fixed-side cut surface 43a. 13B and 13C, the rotation-side cut surface 42a is perpendicular to the impeller rotation direction and extends in the same direction as the motor shaft 11. In the example of FIG. 13B, the fixed-side cut surface 43a is inclined with respect to the impeller rotation direction and the direction in which the motor shaft 11 extends, and is angled θ. In the example of FIG. 13C, the fixed-side cutting surface 43 a is perpendicular to the impeller rotation direction and extends in the same direction as the motor shaft 11.

  14 and 15 show a third alternative of the rotary blade 42 and the fixed blade 43. FIG. In this third alternative, both the rotary blade 42 and the fixed blade 43 are concave blades. An annular projecting portion 39c projecting downward is formed on the outer peripheral side of the lower surface of the wear protector 39, and an arc-shaped groove is provided in a portion where the inner peripheral surface and the bottom surface of the projecting portion 39c meet in plan view. Thus, a fixed blade 43 is formed. The surface on the rear end side in the impeller rotation direction of the rotary blade 42 and the surface on the front end side in the impeller rotation direction of the fixed blade 43 constitute a rotation side cut surface 42a and a fixed side cut surface 43a, respectively. In this example, the rotation-side cut surface 42 a and the fixed-side cut surface 43 a are both perpendicular to the impeller rotation direction and extend in the same direction as the motor shaft 11. However, one or both of the rotation-side cutting surface 42a and the fixed-side cutting surface 43a may be inclined with respect to the impeller rotation direction and the direction in which the motor shaft extends.

  FIG. 16 shows a fourth alternative. In the fourth alternative, the main plate 12b of the impeller 12 is provided with a rotary blade 42 that is a convex blade, but no fixed blade is provided. The rotary blade 42 faces the inner peripheral surface of the protrusion 39c (see FIG. 14A) on the lower surface of the wear protector 39 with a slight gap therebetween. The surface of the rotary blade 42 on the front side in the impeller rotational direction constitutes the rotary side cut surface 42a. Even when only the rotary blade 42 is provided, it is possible to cut impurities. In the example of FIG. 16A, the rotation-side cut surface 42 a is inclined with respect to the impeller rotation direction but extends in the same direction as the motor shaft 11. In the example of FIG. 16B, the rotation-side cut surface 42a is inclined with respect to the impeller rotation direction and the direction in which the motor shaft 11 extends. In the example of FIG. 16C, the rotation-side cut surface 42 a is perpendicular to the impeller rotation direction and extends in the same direction as the motor shaft 11.

Sectional drawing which shows the pump installation concerning embodiment of this invention. Sectional drawing which shows the pump with which pump equipment is provided. The elements on larger scale of FIG. (A) is sectional drawing in the IV-IV line of FIG. 3, (B) is a figure which shows the alternative of the structure of the pumping side of a heat exchanger. The elements on larger scale of the part V of FIG. (A) is typical sectional drawing of the impeller back surface side and wear protector vicinity of the pump of FIG. 2, (B) is sectional drawing in the VI-VI line of (A). (A) is a schematic perspective view showing a combination of a convex rotary blade and a concave fixed blade of the pump of FIG. 2, and (B) and (C) are combinations of a convex rotary blade and a concave fixed blade. The typical perspective view which shows another example. (A) is typical sectional drawing of the 1st alternative plan of the impeller back surface side and wear protector vicinity of the pump of FIG. 2, (B) is sectional drawing in the VIII-VIII line of (A). The typical perspective view which shows the combination of the convex rotary blade with which the alternative of FIG. 8 is provided, and a convex fixed blade. (A), (B), and (C) are typical perspective views which show the other example of the combination of a convex rotating blade and a convex fixed blade. (A) And (B) The typical perspective view which shows the other example of the combination of a convex rotary blade and a convex fixed blade. (A) is typical sectional drawing of the 2nd alternative of the impeller back side and wear protector vicinity of the pump of FIG. 2, (B) is sectional drawing in the XII-XIII line of (A). (A) is a schematic perspective view showing a combination of a concave rotary blade and a convex fixed blade provided in the alternative of FIG. 12, and (B) to (C) are combinations of a concave rotary blade and a convex fixed blade. The typical perspective view which shows the other example. (A) is typical sectional drawing of the 3rd alternative of the impeller back side and wear protector vicinity of the pump of FIG. 2, (B) is sectional drawing in the XV-XV line | wire of (A). The typical perspective view which shows the combination of the concave rotary blade with which the alternative of FIG. 14 is provided, and a convex fixed blade. (A), (B), and (C) are typical perspective views which show the 4th alternative provided only with a convex fixed blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump equipment 2 Water absorption tank 3 Pump chamber 4 Submersible pump 5 Suction pipe 6 Drainage tank 7 Discharge pipe 8 Pump main body 9 Submersible motor 11 Motor shaft 12 Impeller 12a Boss part 12b Main plate 12c Blade 13 Motor casing 14A, 14B Bearing 15 Rotor 16 Stator 17 Oil box 17a Box upper part 17b Box lower part 18 Oil chamber 19 Cooling water box 21 Heat exchanger 21a, 21b Cooling fin 21c Port 22 Cooling water chamber 23 Secondary cooling water path 24 Primary cooling water path 25 Air vent line 26 Pumping return pipe 27 External water injection pipe 28A Upper shaft seal device 28B Lower shaft seal device 29 Water jacket 31 Cooling water space 32 Cooling water outlet pipe 33 Cooling water inlet pipe 34 Circulating blade 36 Pump casing 37 Suction casing 37a Suction inlet 38 Inn Pera casing 38a Discharge port 38b Upper opening 39 Wear protector 39a Circular hole 39b Accommodating groove 39c Projecting part 41 Seal member 42 Rotating blade 42a Rotating side cutting surface 43 Fixed blade 43a Fixed side cutting surface 44 Contaminant

Claims (6)

A water tank for storing pumped water,
A pump chamber provided adjacent to the water absorption tank;
A suction pipe having one end connected to the water absorption tank and the other end located in the pump chamber;
A discharge pipe having one end located in the pump chamber and the other end connected to the drainage side;
A pump main body comprising a vertical shaft having a suction port connected to the suction pipe and a discharge port connected to the discharge pipe, and an impeller of the pump main body provided integrally with an upper portion of the pump main body and having a rotation shaft A submersible motor for driving the pump to which is attached, a submersible pump for sucking the pumped water in the water absorption tank from the suction pipe and discharging it to the discharge pipe,
The submersible pump is
A water jacket provided outside the motor casing of the submersible motor;
Primary cooling water provided between the submersible motor and the pump main body and enclosed in a cooling water space formed between the motor casing and the water jacket is introduced upward, and the pumped water is A heat exchanger introduced to the lower side as secondary cooling water from the back side of the impeller,
A pumping facility comprising: a rotary blade provided on the back side of the impeller facing the pump casing of the pump body.   2. The pump equipment according to claim 1, wherein the submersible pump further includes a fixed blade provided at a portion of the pump casing facing the rotary blade.   The pump equipment according to claim 2, wherein one of the rotating blade and the fixed blade is a convex blade and the other is a concave blade.   The pump equipment according to claim 2, wherein both the rotary blade and the fixed blade are convex blades.   The pump equipment according to claim 2, wherein both the rotary blade and the fixed blade are concave blades.   The pump equipment according to any one of claims 2 to 5, wherein at least one of the rotary blade and the fixed blade is replaceable.

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