JP2018135819A - Submerged pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a submerged pump which can efficiently cool a motor in a water level lower than a motor frame.SOLUTION: A submerged pump 100 includes: a motor 1 having a motor frame 13 and a stator 11 and a rotor 12 disposed in the motor frame 13; a rotary shaft 2 which is rotated by the motor 1 and extends vertically; an impeller 5 connected with the rotary shaft 2; a pump casing 31 in which the impeller 5 is disposed and which is disposed below the motor frame 13; and cooling fins 6 which are provided at an outer periphery of the motor frame 13 and extend to the lower side relative to an upper end 31a of the pump casing 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a submersible pump.

  Conventionally, a submersible pump provided with a motor cooling fin is known (for example, refer to patent documents 1).

  The above-mentioned Patent Document 1 is a submersible including a motor having a motor frame, a rotating shaft, an impeller, a pump casing disposed below the motor frame, and a rib (cooling fin) extending to the upper side of the pump casing. A pump is disclosed. The submersible pump of Patent Document 1 is configured such that when the water level is in the height range (above the pump casing) where the rib is provided, water contacts the rib and the motor is cooled.

Japanese Patent Laying-Open No. 2015-96715

  However, in the submersible pump of Patent Document 1, the rib (cooling fin) does not come into contact with water unless there is a water level above the pump casing, so that the motor cannot be efficiently cooled by the rib. There is a point.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a submersible pump capable of efficiently cooling a motor even at a lower water level than the motor frame. It is to be.

  A submersible pump according to one aspect of the present invention includes a motor having a motor frame and a stator and a rotor arranged inside the motor frame, a rotary shaft rotated by the motor and extending in the vertical direction, and connected to the rotary shaft. An impeller that is disposed inside, a pump casing that is disposed below the motor frame, and a cooling fin that is provided on the outer periphery of the motor frame and extends below the upper end of the pump casing. .

  In the submersible pump according to one aspect of the present invention, the pump casing is disposed below the motor frame as described above, and the cooling fin is disposed on the outer periphery of the motor frame and extends below the upper end of the pump casing. Thereby, since the cooling fin is arrange | positioned to the height position of the pump casing arrange | positioned under a motor frame, a cooling fin can be made to contact water at the water level lower than a motor frame. As a result, the motor can be efficiently cooled even at a lower water level than the motor frame. Moreover, when water flows into the pump casing, the generation of air suction vortices can be suppressed by rectifying the water with the cooling fins.

  In the submersible pump according to the above aspect, the cooling fin preferably extends to the vicinity of the installation surface of the submersible pump. If comprised in this way, since a cooling fin will extend to the installation surface vicinity, even if a water level is the installation surface vicinity, a cooling fin can be contacted with water and a motor can be cooled efficiently.

  In the submersible pump according to the above aspect, the pump casing is preferably provided with a water suction port, and the cooling fin extends below the suction port. If comprised in this way, since a part of cooling fin can be arrange | positioned below the water level which starts the operation | movement of a submersible pump, the motor can be reliably cooled by a cooling fin at the time of an operation start.

  In the submersible pump according to the above aspect, preferably, the pump casing includes a leg portion that supports the submersible pump, and the cooling fin has a motor frame up to a predetermined height position within a range in a height direction in which the leg portion is provided. It extends from the side. If comprised in this way, a submersible pump can be stably supported by a leg part. In addition, since the cooling fin extends to a lower leg than the upper end of the pump casing, the motor at a higher position can be efficiently cooled at a lower water level than the pump casing. The generation of air suction vortices can be further suppressed.

  In the submersible pump according to the above aspect, preferably, a plurality of cooling fins are provided, and the plurality of cooling fins are partially arranged at a predetermined angle in the circumferential direction of the rotating shaft. If comprised in this way, since several cooling fins are arrange | positioned with sufficient balance in the circumferential direction of a motor frame (rotating shaft), in the circumferential direction of a motor frame (rotating shaft), it is balanced from a motor frame with several cooling fins. Heat can be radiated efficiently.

  In the submersible pump according to the above aspect, the cooling fin is preferably formed of a resin containing carbon fiber. If comprised in this way, a cooling fin can be formed with a material with high mechanical strength. In addition, since the cooling fin can be formed of a material other than metal, the cooling fin can be prevented from being corroded and the weight can be reduced.

  In this case, the motor frame is preferably formed of a resin containing carbon fiber and is formed integrally with the cooling fin. If comprised in this way, a motor frame can be formed with a material with high mechanical strength. Further, since the motor frame can be formed of a material other than metal, the motor frame can be prevented from being corroded and the weight can be reduced. In addition, since the motor frame and the cooling fin are integrally formed, the number of parts can be reduced and heat can be efficiently transferred from the motor frame to the cooling fin.

  In the submersible pump according to the above aspect, the cooling fin preferably extends in a direction substantially orthogonal to the axial direction of the rotation shaft. If comprised in this way, since a cooling fin will extend, the area which contacts the water of a cooling fin can be increased. As a result, heat can be effectively radiated from the cooling fin.

  In the submersible pump according to the above aspect, the motor is preferably an inner rotor motor in which a stator is disposed in close contact with a motor frame. If comprised in this way, a heat | fever can be efficiently transmitted to a motor frame from a stator by closely_contact | adhering a motor frame and a stator. As a result, heat can be effectively radiated from the cooling fin via the motor frame.

  In the submersible pump according to the above aspect, preferably, a pair of cooling fins are provided, and the pair of cooling fins are arranged close to each other, and can suck up water by surface tension between the pair of cooling fins. It is configured as follows. If comprised in this way, since water can be sucked up by a pair of cooling fin and water can be radiated as heat of vaporization, it can radiate heat effectively from a cooling fin. In addition, even when the submersible pump is stopped immediately after the operation, the water held between the cooling fins is continuously vaporized by the heat generated from the motor frame, so that the submersible pump can continue to provide a cooling effect efficiently.

  In the submersible pump according to the above aspect, preferably, a plurality of cooling fins are provided, the pump casing is provided with a water suction port, and the plurality of cooling fins are provided below the suction port of the pump casing. A plurality of cooling fins are connected to each other, and a plate member having an annular shape is provided in plan view. If comprised in this way, heat can be radiated also from a board member by transmitting the heat from a cooling fin to a board member. As a result, the motor at a higher position can be efficiently cooled. In addition, the plate member having an annular shape can divide the flow path to the suction port to rectify water effectively. As a result, the generation of air suction vortices can be effectively suppressed. Moreover, it becomes possible to make a cooling fin hard to deform | transform by connecting a some cooling fin mutually with a plate member. Further, by increasing the ring-shaped plate member, the plate member and the cooling fin can have a role like a strainer for preventing foreign matter from entering the submersible pump.

  In the submersible pump according to the above aspect, preferably, a plurality of cooling fins are provided at intervals in the circumferential direction of the rotating shaft, and the plurality of cooling fins are in contact with the installation surface. If comprised in this way, since a submersible pump can be made self-supporting with a cooling fin, it is not necessary to provide the structure for making a submersible pump self-supported, and can simplify an apparatus structure.

  ADVANTAGE OF THE INVENTION According to this invention, the submersible pump which can cool a motor efficiently also at the water level lower than a motor frame as mentioned above can be provided.

It is the schematic which showed the submersible pump by 1st Embodiment of this invention. It is the top view which showed the submersible pump by 1st Embodiment of this invention. It is the schematic perspective view which showed the motor frame, pump casing, and cooling fin of the submersible pump by 1st Embodiment of this invention. It is the table | surface which showed the material characteristic of the motor frame and cooling fin of the submersible pump by 1st Embodiment of this invention. It is the schematic which showed the submersible pump by 2nd Embodiment of this invention. It is the schematic perspective view which showed the motor frame, pump casing, and cooling fin of the submersible pump by 2nd Embodiment of this invention. It is the top view which showed the submersible pump by 3rd Embodiment of this invention. It is an enlarged view of the H section of FIG. It is the schematic which showed the submersible pump by the modification of 1st Embodiment of this invention. It is the schematic perspective view which showed the motor frame, pump casing, and cooling fin of the submersible pump by the modification of 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
(Configuration of submersible pump)
A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the submersible pump 100 according to the first embodiment includes a motor 1, a rotating shaft 2, a pump chamber 3, an oil chamber 4, an impeller 5, and cooling fins 6. The submersible pump 100 is a vertical submersible pump in which the rotary shaft 2 extends in the vertical direction (Z direction).

  The motor 1 is sealed so that water from the outside does not enter. The motor 1 is configured to rotationally drive the impeller 5 connected to the rotary shaft 2 via the rotary shaft 2. Specifically, the motor 1 includes a stator 11 and a rotor 12. The stator 11 is disposed on the outer side (outer peripheral side) of the rotor 12. The stator 11 has a coil (not shown). In addition, the stator 11 is configured to generate a magnetic field when power is supplied from the cable C. The rotor 12 is attached to the rotating shaft 2 and is disposed on the inner side (inner peripheral side) of the stator 11 so as to face the stator 11. That is, the motor 1 is an inner rotor motor. The rotor 12 is configured to rotate together with the rotating shaft 2 by a magnetic field from the stator 11. The rotor 12 is configured to rotationally drive the impeller 5 via the rotation shaft 2.

  The motor 1 includes a motor frame 13. A stator 11 and a rotor 12 are arranged inside the motor frame 13. Specifically, the motor frame 13 has a cylindrical shape in which a hollow space that surrounds the rotation shaft 2 and extends in the vertical direction (Z direction) is formed on the inner side. Further, the stator 11 is disposed inside the motor frame 13 by being press-fitted. That is, the stator 11 is arranged inside the motor frame 13 in a state where the inner peripheral surface is in close contact with the outer peripheral surface of the stator 11.

  The motor frame 13 is formed of a resin containing carbon fiber. For example, the motor frame 13 is made of carbon fiber reinforced plastic (CFRP, Carbon Fiber Reinforced Plastics). The motor frame 13 is formed integrally with the cooling fin 6. Details of the cooling fin 6 will be described later.

  The motor frame 13 is provided (attached) with a motor bracket 14 and a head cover 15. The motor bracket 14 and the head cover 15 are arranged near the upper end of the motor frame 13. The motor bracket 14 supports the bearing 21. The head cover 15 is provided with components for controlling the start and stop of the motor protection device and the motor 1 inside.

  The rotating shaft 2 is configured to rotate by driving the motor 1. The rotating shaft 2 is configured to transmit the driving force (torque) of the motor 1 to the impeller 5. The rotating shaft 2 is rotatably supported by bearings 21 and 22. The rotating shaft 2 is arranged so as to extend from the motor 1 through the oil chamber 4 to the pump chamber 3. An impeller 5 is attached to an end portion (Z2 direction side end portion) opposite to the end portion (Z1 direction side end portion) of the rotating shaft 2 on the motor 1 side.

  The pump chamber 3 includes a pump casing 31. An impeller 5 is disposed inside the pump casing 31. The pump casing 31 is disposed on the lower side (Z2 direction) of the motor frame 13. The pump casing 31 is provided with a suction port 32 and a discharge port 33 for water (sewage or the like).

  Here, hereinafter, the direction in which the discharge ports 33 and the impellers 5 are arranged in the horizontal plane will be referred to as the X direction, and the direction orthogonal to the X direction in the horizontal plane will be described as the Y direction. In the X direction, the direction from the discharge port 33 side toward the impeller 5 side is referred to as the X1 direction, and the opposite direction is referred to as the X2 direction.

  The impeller 5 rotates to suck water in a drainage area (not shown) such as a tank in which the submersible pump 100 is disposed into the pump casing 31 from the suction port 32 and discharge the sucked water to the discharge port 33. It is comprised so that it may send in the direction of (approximately X2 direction).

  The pump casing 31 includes a leg portion 34. The leg portion 34 is provided at the lower end 310 a of the main body portion (container portion in which the impeller 5 is disposed) 310 of the pump casing 31. Plural legs 34 are provided and support the pump casing 31 (submersible pump 100). That is, the leg part 34 is arrange | positioned in the state which the lower end contacted the installation surface G. FIG.

  The oil chamber 4 is disposed between the motor 1 and the pump chamber 3. Specifically, the oil chamber 4 is disposed below the motor frame 13 (Z2 direction side) and above the pump casing 31 (Z1 direction side).

  The oil chamber 4 includes an oil casing 41, a mechanical seal 42, and an oil lifter 43. The oil casing 41 is filled with oil inside.

  The oil casing 41 is located below the bearing housing 41a that supports the bearing 22, and the bearing housing 41a and the oil casing 41b engage with each other to form a hollow space for filling oil inside. Forming. The oil casing 41 b is attached to the upper side (Z1 direction) of the suction port 32 with respect to the pump casing 31.

  The mechanical seal 42 has sliding portions (not shown) on the load side (the pump chamber 3 side, that is, the Z2 direction side) and on the non-load side (opposite side to the pump chamber 3, that is, the Z1 direction side). )have. The sliding portion on the load side has a function of preventing (suppressing) the pressure water in the pump chamber 3 from flowing into the oil chamber 4. Further, the sliding portion on the anti-load side has a function of preventing (suppressing) the fluid containing the oil in the oil chamber 4 from flowing into the motor 1 side. The sliding portion is lubricated by the oil filled in the oil chamber 4 and cooled so as not to be burned. A seal (not shown) is provided between the mechanical seal 42 and the bearing 22 above the non-load side (upper end). For example, an oil seal or the like is used as the seal.

  The oil lifter 43 is provided around the rotating shaft 2 of the oil chamber 4 and has a cylindrical shape surrounding the rotating shaft 2. The oil lifter 43 is configured to lift the oil upward (Z1 direction) as the rotary shaft 2 rotates. That is, the oil lifter 43 is configured to supply oil to the sliding portion of the mechanical seal 42 on the side opposite to the load. A through hole 43 a is provided in the lower part of the oil lifter 43. The through hole 43 a is configured to guide oil to the inner peripheral side of the oil lifter 43. The oil lifter 43 is configured to return the oil lifted upward (Z1 direction) from the upper end side of the oil lifter 43 to the outer peripheral side. In this way, the oil lifter 43 circulates oil around the mechanical seal 42.

(Configuration of cooling fins)
Next, the configuration of the cooling fin 6 will be described with reference to FIGS.

  The cooling fins 6 shown in FIG. 1 are formed of a resin containing carbon fibers, like the motor frame 13. That is, the cooling fin 6 is made of carbon fiber reinforced plastic. The cooling fin 6 has a thin flat plate shape. The cooling fin 6 extends in a direction orthogonal to the axial direction (Z direction) of the rotating shaft 2. Moreover, the cooling fin 6 is extended also in the up-down direction (Z direction). That is, the cooling fin 6 extends in the radial direction (R1 direction) of the rotating shaft 2. The cooling fins 6 have a uniform width t1 in the radial direction (R1) direction.

  The cooling fin 6 is formed integrally with the motor frame 13. In FIG. 1, for convenience of explanation, only one cooling fin 6 on the center line α shown in FIG. 2 is shown. The center line α is the center line of the submersible pump 100 that passes through the rotation shaft 2 and the discharge port 33 and extends in the X direction. As shown in FIGS. 2 and 3, a plurality of (13) cooling fins 6 are provided on the outer periphery of the motor frame 13. Specifically, as shown in FIG. 2, one cooling fin 6 is provided on the center line α, and six cooling fins 6 are provided on one side and the other side in the Y direction of the center line α. Further, the plurality of (13) cooling fins 6 are arranged symmetrically with respect to the center line α in plan view (viewed from the Z direction).

  As shown in FIG. 1, the connection portion 6 a of the cooling fin 6 with the motor frame 13 is a range including the stator 11 in the height direction, and is provided in a range larger than the stator 11. That is, the connection portion 6a of the cooling fin 6 overlaps the entire range of the stator 11 in the height direction.

  As shown in FIG. 2, the plurality (13) of cooling fins 6 are partially arranged at a predetermined angle in the circumferential direction (R2 direction) of the rotating shaft 2. Specifically, the plurality of (13) cooling fins 6 are arranged at equal angular intervals (22.5 degrees) in the circumferential direction except for the X2 direction side (discharge port 33 side) of the rotating shaft 2.

  As shown in FIG. 1, the cooling fins 6 generally extend in the vertical direction (Z direction) while maintaining the width t1 in the radial direction (R1 direction). The cooling fin 6 extends downward (Z2 direction) while avoiding the pump casing 31 so that the cooling fin 6 does not interfere with the pump casing 31 and is on the lower side in the radial direction (R1 direction).

  Here, in the first embodiment, the cooling fin 6 extends below the upper end 31 a of the pump casing 31. That is, the lower end 6 b of the cooling fin 6 is disposed below the upper end 31 a of the pump casing 31. Further, the lower end 6 b of the cooling fin 6 extends below the lower end 310 a of the main body 310 of the pump casing 31.

  The cooling fin 6 extends to the vicinity of the installation surface G of the submersible pump 100. In other words, the lower end 6b of the cooling fin 6 is disposed in the vicinity of the installation surface G of the submersible pump 100 with an interval t2. As a specific example, the lower end 6 b of the cooling fin 6 is disposed at a position spaced 1 mm (t2) upward from the installation surface G of the submersible pump 100. Further, the cooling fin 6 extends to a lower side than the suction port 32. Further, the cooling fin 6 extends from the motor frame 13 side to a predetermined height position within a range in the height direction where the leg portion 34 of the pump casing 31 is provided.

(Material characteristics of motor frame and cooling fin)
Next, an example of material characteristics of the carbon fiber reinforced plastic forming the motor frame 13 and the cooling fin 6 will be described with reference to FIG.

For example, the carbon fiber reinforced plastic has a thermal conductivity of 3 to 3.5 [kcal / m · h · ° C.], a tensile strength of 160 to 450 [kgf / mm ² ], and a tensile elastic modulus. Is 12000 or more and 15000 or less [kgf / mm ² ], bending strength is 130 or more and 200 or less [kgf / mm ² ], bending elastic modulus is 9000 or more and 13000 or less [kgf / mm ² ], and linear expansion The coefficient is 0.2 or more and 0.4 or less [10 ⁻⁶ / ° C.], and the density is 1.5 [g / cm ³ ].

  A comparison between a carbon fiber reinforced plastic and a metal material will be described. Here, aluminum is given as an example of the metal material.

Aluminum has a thermal conductivity of 100 [kcal / m · h · ° C.], a tensile strength of 25 [kgf / mm ² ], a tensile modulus of 7200 [kgf / mm ² ], and linear expansion. The coefficient is 23.6 [10 ⁻⁶ / ° C.] and the density is 2.7 [g / cm ³ ]. Therefore, carbon fiber reinforced plastic is a material that has higher mechanical strength than aluminum and is not easily deformed by heat. Carbon fiber reinforced plastic has a lower density (about half) than aluminum.

  A comparison between a carbon fiber reinforced plastic and a resin material will be described. Here, MC nylon, 6 nylon and polypropylene are listed as examples of the resin material.

MC nylon has a tensile strength of 8.6 [kgf / mm ² ], a tensile modulus of 380 [kgf / mm ² ], a bending strength of 11 [kgf / mm ² ], and a flexural elasticity The rate is 355 [kgf / mm ² ], the linear expansion coefficient is 83 [10 ⁻⁶ / ° C.], and the density is 1.15 [g / cm ³ ]. Therefore, the carbon fiber reinforced plastic is a material that has an extremely higher mechanical strength than MC nylon and is extremely difficult to be deformed by heat.

Nylon 6 has a thermal conductivity of 0.215 [kcal / m · h · ° C.] and a density of 1.12 or more and 1.14 or less [g / cm ³ ]. Polypropylene has a thermal conductivity of 0.107 [kcal / m · h · ° C.] and a density of 0.90 or more and 0.91 or less [g / cm ³ ]. Therefore, carbon fiber reinforced plastic is a material having a thermal conductivity that is at least 10 times greater than that of nylon 6 or polypropylene. That is, a material in which carbon fiber is contained in a resin (carbon fiber reinforced plastic) has a much higher thermal conductivity than a material made only of resin (a material in which carbon fiber is not contained in the resin).

(Effect of 1st Embodiment)
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the pump casing 31 is disposed below the motor frame 13, the cooling fin 6 is provided on the outer periphery of the motor frame 13 and extends below the upper end 31 a of the pump casing 31. . Thereby, since the cooling fin 6 is arrange | positioned to the height position of the pump casing 31 arrange | positioned under the motor frame 13, the cooling fin 6 can be made to contact with water in the water level lower than the motor frame 13. FIG. . As a result, the motor 1 can be efficiently cooled even at a lower water level than the motor frame 13. Moreover, when water flows into the pump casing 31, the generation of air suction vortices can be suppressed by rectifying the water with the cooling fins 6.

  Moreover, in 1st Embodiment, the cooling fin 6 is extended to the installation surface G vicinity of the submersible pump 100 as mentioned above. As a result, the cooling fins 6 extend to the vicinity of the installation surface G, which is the lower limit where the cooling fins 6 can be disposed. Therefore, even if the water level is in the vicinity of the installation surface G, the cooling fins 6 are brought into contact with water so Can cool well.

  Further, in the first embodiment, as described above, the cooling fin 6 is extended to the lower side than the suction port 32. Thereby, since a part of cooling fin 6 can be arrange | positioned below the water level which starts the driving | operation of the submersible pump 100, the motor 1 can be reliably cooled by the cooling fin 6 at the time of a driving | running start.

  Moreover, in 1st Embodiment, the leg part 34 which supports the submersible pump 100 is provided in the pump casing 31, as mentioned above, and the cooling fin 6 is predetermined height within the range of the height direction in which the leg part 34 is provided. It extends from the motor frame 13 side to the position. As a result, the submersible pump 100 can be stably supported by the legs 34. Moreover, since the cooling fin 6 extends to the lower leg portion 34 than the upper end 31 a of the pump casing 31, the motor 1 at a higher position can be efficiently cooled at a lower water level than the pump casing 31. The generation of air suction vortices can be further suppressed. Further, the submersible pump 100 can be stably supported by the legs 34.

  In the first embodiment, as described above, the plurality of cooling fins 6 are partially arranged at a predetermined angle in the circumferential direction of the rotating shaft 2. As a result, the plurality of cooling fins 6 are arranged in a balanced manner in the circumferential direction of the motor frame 13 (rotating shaft 2), and therefore the motor frame 13 is arranged by the plurality of cooling fins 6 in the circumferential direction of the motor frame 13 (rotating shaft 2). The heat can be efficiently radiated in a balanced manner.

  In the first embodiment, as described above, the cooling fins 6 are formed of a resin containing carbon fibers. Thereby, the cooling fin 6 can be formed with a material with high mechanical strength. Further, since the cooling fins 6 can be formed of a material other than metal, the cooling fins 6 can be prevented from being corroded, and the weight can be reduced.

  In the first embodiment, as described above, the motor frame 13 is formed of a resin containing carbon fiber and is formed integrally with the cooling fin 6. Thereby, the motor frame 13 can be formed of a material having high mechanical strength. In addition, since the motor frame 13 can be formed of a material other than metal, the motor frame 13 can be prevented from being corroded, and the weight can be reduced. Moreover, since the motor frame 13 and the cooling fin 6 are integrally formed, the number of parts can be reduced, and heat can be efficiently transferred from the motor frame 13 to the cooling fin 6.

  In the first embodiment, as described above, the cooling fins 6 are extended in a direction substantially orthogonal to the axial direction of the rotating shaft 2. Thereby, since the cooling fin 6 extends, the area which contacts the water of the cooling fin 6 can be increased. As a result, heat can be effectively radiated from the cooling fins 6.

  In the first embodiment, as described above, the motor 1 is configured by the inner rotor motor that is disposed in close contact with the motor frame 13. Thereby, heat can be efficiently transferred from the stator 11 to the motor frame 13 by bringing the motor frame 13 and the stator 11 into close contact with each other. As a result, heat can be effectively radiated from the cooling fins 6 via the motor frame 13.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, an example in which a plate member 61 is provided on the cooling fin 6 in addition to the configuration of the first embodiment will be described.

  The submersible pump 200 (see FIG. 1) according to the second embodiment of the present invention includes the cooling fin 6 provided with the plate member 61.

  One plate member 61 is provided. Further, the plate member 61 is provided below the suction port 32 of the pump casing 31. The plate member 61 is provided above the lower end 6 b of the cooling fin 6. The plate member 61 has an annular shape (annular shape) extending in the horizontal direction in plan view. The plate member 61 connects a plurality (13) of cooling fins 6 to each other. The plate member 61 has the rotation shaft 2 disposed at the center in plan view. The plate member 61 and the plurality of (13) cooling fins 6 divide (divide) the water flow path to the suction port 32 of the pump casing 31 into a plurality in the vertical direction and the horizontal direction.

  Other configurations of the second embodiment are the same as those of the first embodiment.

(Effect of 2nd Embodiment)
In the second embodiment, the following effects can be obtained.

  In the second embodiment, similarly to the first embodiment, the pump casing 31 is disposed below the motor frame 13, is disposed on the outer periphery of the motor frame 13, and extends below the upper end 31 a of the pump casing 31. Fins 6 are provided. Thereby, the motor 1 can be efficiently cooled even at a water level lower than that of the motor frame 13.

  In the second embodiment, as described above, the plurality of cooling fins 6 are connected to the plurality of cooling fins 6 on the lower side of the suction port 32 of the pump casing 31 and have an annular shape in plan view. A plate member 61 is provided. Thus, heat can be radiated from the plate member 61 by transferring heat from the cooling fins 6 to the plate member 61. As a result, the motor 1 at a higher position can be efficiently cooled. Moreover, the flow path to the suction port 32 can be divided by the plate member 61 having an annular shape, and water can be effectively rectified. As a result, the generation of air suction vortices can be effectively suppressed. Further, by connecting the plurality of cooling fins 6 to each other by the plate member 61, the cooling fins 6 can be made difficult to be deformed. Further, by increasing the ring-shaped plate member 61, the plate member 61 and the cooling fin 6 can have a role like a strainer for preventing foreign matter from entering the submersible pump 200.

  Other effects of the second embodiment are the same as those of the first embodiment.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. 1, FIG. 7, and FIG. In the third embodiment, unlike the first embodiment in which the cooling fins 6 are arranged one by one at predetermined angular intervals in the circumferential direction (R2 direction) of the rotating shaft 2, the circumferential direction (R2 direction) of the rotating shaft 2 is different. An example in which two cooling fins 6 are arranged at predetermined angular intervals (two sets of one set 60 of cooling fins 6 each) will be described.

  A submersible pump 300 (see FIG. 1) according to the third embodiment of the present invention is provided with a pair of cooling fins 6 as shown in FIG. That is, the submersible pump 300 includes a plurality of sets 60 of a pair of cooling fins 6. Further, the pair of cooling fins 6 are arranged close to each other with an interval t3 (see FIG. 8). Further, the pair of cooling fins 6 is configured to be able to suck up water by surface tension between the pair of cooling fins 6.

  A plurality (13 sets) of sets 60 of the pair of cooling fins 6 are provided. The set 60 of a plurality of pairs of cooling fins 6 is provided at a position corresponding to the plurality of (13) cooling fins 6 of the first embodiment. That is, the sets 60 of a plurality of pairs of cooling fins 6 are respectively arranged at equal angular intervals (22.5 degrees) in the circumferential direction except for the X2 direction side (discharge port 33 side) of the rotating shaft 2. . Moreover, as shown in FIG. 8, the distance t3 between the pair of cooling fins 6 is set to 0.5 mm or more and 1 mm or less, for example.

  Other configurations of the third embodiment are the same as those of the first embodiment.

(Effect of the third embodiment)
In the third embodiment, the following effects can be obtained.

  In the third embodiment, similarly to the first embodiment, the pump casing 31 is disposed below the motor frame 13, is disposed on the outer periphery of the motor frame 13, and extends below the upper end 31 a of the pump casing 31. Fins 6 are provided. Thereby, the motor 1 can be efficiently cooled even at a water level lower than that of the motor frame 13.

  In the third embodiment, as described above, the pair of cooling fins 6 are arranged close to each other so that water can be sucked up by surface tension between the pair of cooling fins 6. Thus, water can be sucked up by the pair of cooling fins 6 and the water can be dissipated as heat of vaporization, so that heat can be effectively radiated from the cooling fins 6. In addition, even when the submersible pump 300 is stopped immediately after the operation, the water held between the cooling fins 6 continues to be vaporized by the heat generated from the motor frame 13, so that the submersible pump 300 can continue to provide a cooling effect efficiently. it can.

  Other effects of the third embodiment are the same as those of the first embodiment.

(Modification)
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, the cooling fin and the motor frame are formed of a resin containing carbon fiber. However, the present invention is not limited to this. In the present invention, the cooling fin and the motor frame may be formed of a material other than a resin containing carbon fibers such as metal (for example, plain woven wire mesh). In addition, only one of the cooling fin and the motor frame is formed of a resin containing carbon fiber, and the other is formed of a material other than a resin containing carbon fiber such as metal (for example, plain woven wire mesh (Poremet)). Also good.

  Moreover, although the example which provided the leg part which supports a submersible pump was shown in the said 1st-3rd embodiment, this invention is not limited to this. In the present invention, for example, like the submersible pump 400 of the modified example of the first embodiment shown in FIG. 9, the cooling fin 406 may be configured to stand by itself without providing a leg portion. As a specific example, a plurality of (13) cooling fins 406 are provided at intervals in the circumferential direction of the rotating shaft 2. In FIG. 9, only one cooling fin 406 is shown as a representative for convenience of explanation as in FIG. 1. The plurality of cooling fins 406 are in contact with the installation surface G, respectively. Thereby, since the submersible pump 400 can be made self-supporting by the cooling fin 6, it is not necessary to provide the structure for making the submersible pump 400 self-supported, and an apparatus structure can be simplified.

  Moreover, although the example which provided one board member was shown in the said 2nd Embodiment, this invention is not limited to this. In the present invention, two or more plate members 61 may be provided as in the submersible pump 500 of the modification of the second embodiment shown in FIG. In the submersible pump 500, the plate member 61 is also provided at the lower end 6 b of the cooling fin 6. The two plate members 61 are arranged in parallel to each other. Three or more plate members may be provided. By increasing the number of plate members in this way, it is possible to reinforce the cooling fins and to divide the flow path of the water into the suction port by the cooling fins and the plate members and to have a more rectifying effect. Become. Further, by increasing the plate member and making the section divided by the cooling fin and the plate member finer, it can have a role like a strainer for preventing foreign matter from entering the pump.

  Moreover, although the example which formed the board member in the annular | circular shape was shown in the said 2nd Embodiment, this invention is not limited to this. In the present invention, the plate member may be formed in a quadrilateral or other polygonal ring shape. Besides the polygonal shape, for example, the plate member may be formed in a circular truncated cone shape having a thickness.

  Moreover, although the example which provided 13 cooling fins was shown in the said 1st-3rd embodiment, this invention is not limited to this. In the present invention, 1 to 12 cooling fins or 14 or more cooling fins may be provided.

  Moreover, in the said 1st-3rd embodiment, although the example which comprised the motor frame and the cooling fin integrally was shown, this invention is not restricted to this. In the present invention, the motor frame and the cooling fin may be configured separately.

  Moreover, although the example which comprised the motor by the inner rotor motor was shown in the said 1st-3rd embodiment, in this invention, it is not necessary to comprise a motor by an inner rotor motor.

  Moreover, in the said 1st-3rd embodiment, although the example which arrange | positioned several cooling fins to a part of circumferential direction of an impeller (it did not arrange | position to the discharge outlet side) was shown, this invention is not limited to this. Absent. In the present invention, a plurality of cooling fins may be evenly arranged in the entire circumferential direction of the impeller.

  Moreover, although the example which comprised the cooling fin extended to the installation surface vicinity was shown in the said 1st-3rd embodiment, this invention is not limited to this. In the present invention, as long as the cooling fin extends below the upper end of the pump casing, the cooling fin need not be configured to extend to the vicinity of the installation surface.

  Moreover, in the said 1st-3rd embodiment, although the example comprised so that a cooling fin was connected only with a motor frame was shown, this invention is not limited to this. In the present invention, the cooling fins may be connected to other members forming the submersible pump, such as a head cover, an oil casing, and a pump casing, in addition to the connection with the motor frame, for reinforcement and heat radiation assistance.

DESCRIPTION OF SYMBOLS 1 Motor 2 Rotating shaft 5 Impeller 6, 406 Cooling fin 11 Stator 12 Rotor 13 Motor frame 31 Pump casing 31a Upper end of pump casing 32 Suction port 34 Leg 61 Plate member 100, 200, 300, 400, 500 Submersible pump G Installation surface

Claims (12)

A motor having a motor frame and a stator and a rotor disposed inside the motor frame;
A rotating shaft rotated by the motor and extending in the vertical direction;
An impeller connected to the rotating shaft;
A pump casing disposed inside the impeller and disposed below the motor frame;
A submersible pump comprising cooling fins provided on an outer periphery of the motor frame and extending to a lower side than an upper end of the pump casing.   The submersible pump according to claim 1, wherein the cooling fin extends to the vicinity of an installation surface of the submersible pump. The pump casing is provided with a water inlet,
The submersible pump according to claim 1, wherein the cooling fin extends to a lower side than the suction port. The pump casing includes legs that support the submersible pump,
The submersible pump according to claim 1, wherein the cooling fin extends from the motor frame side to a predetermined height position within a range in a height direction in which the leg portion is provided. A plurality of the cooling fins are provided,
The submersible pump according to any one of claims 1 to 4, wherein the plurality of cooling fins are arranged partially apart from each other in a circumferential direction of the rotation shaft.   The submersible pump according to claim 1, wherein the cooling fin is formed of a resin containing carbon fiber.   The submersible pump according to claim 6, wherein the motor frame is formed of a resin containing carbon fiber and is formed integrally with the cooling fin.   The said cooling fin is a submersible pump of any one of Claims 1-7 extended in the direction substantially orthogonal to the axial direction of the said rotating shaft.   The submersible pump according to any one of claims 1 to 8, wherein the motor is an inner rotor motor in which the stator is disposed in close contact with the motor frame. A pair of the cooling fins are provided,
The pair of cooling fins are arranged close to each other, and configured to be able to suck up water by surface tension between the pair of cooling fins. Submersible pump as described. A plurality of the cooling fins are provided,
The pump casing is provided with a water inlet,
The plurality of cooling fins are connected to the plurality of cooling fins on the lower side of the suction port of the pump casing, and are provided with plate members having an annular shape in plan view. The submersible pump according to any one of 10 above. A plurality of the cooling fins are provided at intervals in the circumferential direction of the rotating shaft,
The submersible pump according to claim 1, wherein each of the plurality of cooling fins is in contact with an installation surface.

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