WO2022009460A1 - 水中ポンプ - Google Patents
水中ポンプ Download PDFInfo
- Publication number
- WO2022009460A1 WO2022009460A1 PCT/JP2021/006941 JP2021006941W WO2022009460A1 WO 2022009460 A1 WO2022009460 A1 WO 2022009460A1 JP 2021006941 W JP2021006941 W JP 2021006941W WO 2022009460 A1 WO2022009460 A1 WO 2022009460A1
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- WO
- WIPO (PCT)
- Prior art keywords
- water channel
- impeller
- pump
- pump casing
- peripheral side
- Prior art date
Links
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 31
- 230000002093 peripheral effect Effects 0.000 claims description 69
- 230000007423 decrease Effects 0.000 claims description 33
- 230000009467 reduction Effects 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 45
- 230000008878 coupling Effects 0.000 description 11
- 238000010168 coupling process Methods 0.000 description 11
- 238000005859 coupling reaction Methods 0.000 description 11
- 230000008859 change Effects 0.000 description 6
- 238000012856 packing Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/428—Discharge tongues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4293—Details of fluid inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2210/00—Working fluids
- F05D2210/10—Kind or type
- F05D2210/11—Kind or type liquid, i.e. incompressible
Definitions
- the present invention relates to a submersible pump.
- the above-mentioned Jikken 3-87890 discloses a submersible motor pump (so-called one-sided waterway pump) in which a flow path extending along a rotation axis is provided on one side of a submersible pump main body.
- the submersible motor pump sucks water from the suction port provided in the pump casing by rotating the impeller provided at the lower end of the rotating shaft, and discharges water upward through the flow path on one side of the submersible pump body. It is configured to send towards the exit.
- the present invention has been made to solve the above-mentioned problems, and one object of the present invention is to provide a submersible pump capable of increasing the total head.
- the submersible pump in one aspect of the present invention is a submersible pump provided with a one-sided water channel extending along the rotation axis on one side of the submersible pump body, and is attached to one end of the rotation shaft.
- the impeller is provided with a pump casing in which the impeller is located inside, and the pump casing is located between the pump chamber in which the impeller is located and the inlet opening of the one-sided waterway when viewed from the axial direction of the axis of rotation.
- the tongue portion arranged between the pump chamber in which the impeller is arranged and the inlet opening of the one-sided water channel when viewed from the axial direction of the rotating shaft
- the pump casing is provided with a connecting water channel which is arranged between the inner surface of the pump casing and the tongue when viewed from the axial direction of the rotating shaft and is directly connected to the inlet opening from the upstream side.
- the water flow (flow path cross-sectional area) can be narrowed down and the water flow can be adjusted. This allows water to flow smoothly into one-sided channels at a faster rate. As a result, the total head of the submersible pump can be increased.
- the one-sided water channel is formed so that the cross-sectional area of the flow path gradually decreases from the downstream side to the inlet opening on the upstream side.
- the water flow flow path cross-sectional area
- the channel cross-sectional area of the one-sided channel so as to gradually decrease instead of suddenly changing it, it is possible to suppress the water flow from being disturbed by the sudden change in the channel cross-sectional area. .. As a result, the total head of the submersible pump can be further increased.
- a motor including a motor frame installed with respect to the pump casing from the side opposite to the suction port side in the axial direction is further provided, and the one-sided water channel is formed so as to straddle the motor frame and the pump casing. It is formed so that the cross-sectional area of the flow path gradually decreases from the motor frame on the downstream side toward the pump casing on the upstream side.
- the one-sided water channel provided in the pump casing but also the one-sided water channel provided in the motor frame can be formed so that the cross-sectional area of the flow path gradually becomes smaller, so that a relatively large range can be obtained.
- One-sided channels can be formed so that the cross-sectional area of the channel gradually decreases. Therefore, since a sudden change in the cross-sectional area of the flow path can be further suppressed, the total head of the submersible pump can be further increased.
- the impeller preferably includes a plate-shaped portion and a blade portion provided on the suction port side of the plate-shaped portion, and the blade portion is a portion on the inner peripheral side of the blade portion. Is inclined toward the outer circumference.
- the blade portion is formed so that the size in the axial direction gradually decreases from the inner peripheral side to the outer peripheral side of the impeller, and the facing surface facing the blade portion of the pump casing is formed.
- the blades are inclined from the inner peripheral side to the outer peripheral side of the impeller corresponding to the size of the blade portion in the axial direction which gradually decreases.
- the impeller has a channel cross-sectional area formed between the blade portions from the inner peripheral side to the outer peripheral side of the impeller. It is formed so that it gradually becomes smaller toward the side.
- the outer diameter of the impeller can be increased by making the blade width on the outer peripheral side (exit side) smaller than that on the inner peripheral side (inlet side), so that the submersible pump in a small flow rate range can be used. The total head of the can be further increased.
- a motor including a motor frame installed with respect to the pump casing from the side opposite to the suction port side in the axial direction is further provided, and the inner surface of the one-sided water channel is a motor frame. It is formed in a smooth shape with no step between the and the discharge port. With this configuration, unlike the case where there is a step, it is possible to prevent the flow of water passing through the one-sided water channel from being disturbed, so that the total head of the submersible pump can be further increased.
- the tongue portion is upstream of the inlet opening so as to partition between the vicinity of the center of the pump chamber and the inlet opening of the one-sided water channel when viewed from the axial direction of the rotation axis. It extends to the side.
- the connection is not in the direction of directly connecting the vicinity of the center of the pump chamber and the inlet opening of the one-sided channel, but in the direction along the flow of water generated in the pump chamber by the impeller. Waterways can be placed. Therefore, water can be smoothly flowed from the pump chamber into the connecting water channel at a high speed, so that the total head of the submersible pump can be further increased.
- the pump casing is provided on the other end side of the rotating shaft with respect to the connecting water channel and includes a surface forming the connecting water channel, and the surface forming the connecting water channel is the rotating shaft.
- the inner surface of the pump casing viewed from the axial direction of the pump casing and the tongue are connected to each other.
- the surface forming the connecting water channel by connecting the inner surface of the pump casing and the tongue when viewed from the axial direction of the rotating shaft to each other is composed of a separate lid-shaped member different from the pump casing. The number of parts can be reduced and the device configuration can be simplified as compared with the case where the parts are used.
- the motor frame has a flow of the one-sided channel from the motor frame on the downstream side toward the pump casing on the upstream side.
- a reduction portion is provided in which the appearance shape gradually decreases from the downstream side to the upstream side.
- FIG. 3 is an enlarged view of the pump casing and impeller of FIG. 1.
- FIG. 3 is a cross-sectional view taken along the line 90-90 of FIG. It is a top view of the pump casing of the submersible pump according to the embodiment. It is an arrow view along the line 91-91 of FIG.
- the submersible pump 100 of the present embodiment will be described with reference to FIGS. 1 to 3.
- the submersible pump 100 is a vertical electric pump in which the rotation center axis ⁇ of the rotation shaft 1 extends in the vertical direction (Z direction).
- the submersible pump 100 is a so-called one-sided water channel pump in which a one-sided water channel 6 extending along the rotation shaft 1 is provided on one side of the submersible pump main body 100a.
- the submersible pump 100 of the present embodiment is used at a site where a particularly large total head is required, such as a tunnel work site in a mountain.
- the one-sided water channel 6 shown in FIG. 1 is a water channel through which water in the pump chamber 5a flows toward the discharge port 101b.
- the one-sided water channel 6 is formed so as to straddle each member of the pump casing 5, the motor frame 22, and the bracket 24, which will be described later. That is, a part of the uppermost stream of the one-sided water channel 6 is formed in the pump casing 5.
- the bracket 24 is formed with a portion of the most downstream part of the one-sided water channel 6.
- the motor frame 22 is formed with a part of a one-sided water channel 6 located between the pump casing 5 and the bracket 24.
- the direction in which the rotation center axis ⁇ of the rotation axis 1 extends is shown in the Z direction
- the direction from the impeller 4 side to the motor 2 side in the Z direction is shown in the Z1 direction (upward), and the opposite direction to the Z1 direction.
- the Z2 direction is shown in the Z2 direction.
- the radial direction of the rotating shaft 1 (impeller 4) is indicated by the R direction.
- the R direction is orthogonal to the Z direction.
- the submersible pump 100 includes a rotary shaft 1, a motor 2, a hose coupling 3 attached to a discharge port 101b, an impeller 4, a pump casing 5 in which the impeller 4 is arranged inside, and the above-mentioned one-sided water channel 6. And have. At the bottom of the submersible pump 100, a strainer 102 that prevents the suction of foreign matter and functions as a stand for the submersible pump 100 to stand upright is provided. In some cases, the pipe is connected to the discharge port 101b without providing the hose coupling 3.
- the rotation axis 1 generally has a cylindrical shape extending in the vertical direction (Z direction).
- An impeller 4 is attached to one end 10a (lower end) of the rotating shaft 1 in the Z2 direction, and a motor 2 (rotor 21) is fixed to the other end 10b (upper end) side in the Z1 direction.
- the rotating shaft 1 has a function of transmitting the driving force of the motor 2 to the impeller 4.
- the rotating shaft 1 has a contact surface 11 that abuts the end surface of the impeller 4 in the Z1 direction.
- the contact surface 11 has a function of positioning the impeller 4 with respect to the rotating shaft 1 in the Z direction.
- the rotary shaft 1 is configured such that the impeller 4 is fitted from the lower side and a key member (not shown) is installed in the gap between the rotary shaft 1 and the impeller 4.
- the rotary shaft 1 is configured so that the impeller 4 is positioned with respect to the rotary shaft 1.
- the rotations of the rotation shaft 1 and the impeller 4 are synchronized.
- the motor 2 is configured to rotationally drive the rotary shaft 1.
- the motor 2 is configured to rotationally drive the impeller 4 via the rotating shaft 1.
- the motor 2 includes a stator 20 having a coil, a rotor 21 arranged on the inner peripheral side of the stator 20, a motor frame 22, an upper bearing 23a, a lower bearing 23b, and a bracket 24. Includes.
- the rotary shaft 1 is also included in the motor 2.
- the rotation shaft 1 is fixed to the rotor 21.
- the motor 2 is configured to rotationally drive the rotary shaft 1 together with the rotor 21 by generating a magnetic field with the stator 20.
- the motor frame 22 covers the stator 20 and the rotor 21.
- the upper bearing 23a and the lower bearing 23b rotatably support the upper side and the lower side of the rotating shaft 1, respectively.
- An upper bearing 23a is installed on the bracket 24.
- the bracket 24 is fixed to the motor frame 22 from above.
- the lower bearing 23b is composed of two angular contact ball bearings that are vertically overlapped with each other and have different orientations from each other. By configuring the lower bearing 23b in this way, it is possible to handle axial loads in different directions in both directions, and it is possible to handle axial loads in both the small flow rate side and the large flow rate side. ..
- the motor frame 22 is installed with respect to the pump casing 5 from the side opposite to the suction port 101a side (upper side) in the axial direction (Z direction) of the rotating shaft 1.
- the motor frame 22 has a frame portion 22a forming a motor chamber 2a in which the stator 20 and the rotor 21 are arranged, and a frame portion 22b forming a part of the one-sided water channel 6.
- Both the frame portion 22a and the frame portion 22b are formed in a cylindrical shape having through holes penetrating in the vertical direction.
- the frame portion 22b is arranged on the outer peripheral side of the frame portion 22a in the radial direction (R direction) of the rotating shaft 1 (impeller 4).
- the bracket 24 forms a part of the most downstream part of the one-sided waterway 6.
- the bracket 24 is provided with a discharge port 101b inclined with respect to the horizontal direction (direction orthogonal to the Z direction).
- a hose coupling 3 is attached to the bracket 24 from above so as to cover the discharge port 101b.
- the hose coupling 3 has a shape obtained by cutting a cylindrical shape diagonally. That is, the hose coupling 3 has an inclined end face 30 inclined with respect to the direction in which the cylindrical shape extends.
- the hose coupling 3 is fixed to the bracket 24 by the fixing member F.
- the inclined end surface 30 of the hose coupling 3 faces the bracket 24 from above with the hose coupling 3 fixed to the bracket 24 by the fixing member F.
- the hose coupling 3 is released from being fixed by the fixing member F, and then the inclined end surface 30 is rotated with respect to the discharge port 101b while facing the bracket 24, so that the flow of water discharged from the discharge port 101b flows. It is configured so that the direction can be switched. Specifically, the hose coupling 3 is configured to be able to switch between a state in which water discharged from the discharge port 101b flows directly above the discharge port 101b and a state in which the water flows in a direction inclined by a predetermined angle ⁇ with respect to the direct top. Has been done.
- the impeller 4 is arranged in the pump chamber 5a inside the pump casing 5.
- the impeller 4 is a semi-open type impeller. That is, the impeller 4 includes a plate-shaped portion (shroud) 40 and a plurality of blade portions (vanes) 41 provided on the suction port 101a side (lower side) of the plate-shaped portion 40.
- the impeller 4 is provided with a back blade 4a on the upper side (opposite to the blade portion 41 side) of the plate-shaped portion 40.
- the back blade 4a has a function of suppressing a downward load acting on the impeller 4. That is, the back blade 4a has a function of suppressing the load acting on the bearing during the pump operation.
- a labyrinth seal LS is provided between the impeller 4 and the pump casing 5, and a space 8 is provided between the pump chamber 5a and the oil chamber 7. Therefore, it is avoided that the pressure in the pump chamber 5a is directly applied to the oil chamber 7.
- the leakage of water from the pump chamber 5a to the space 8 increases as the pressure in the pump chamber 5a increases, and the amount of water discharged from the pump casing 5 decreases.
- the plate-shaped portion 40 is formed in a circular flat plate shape extending in a direction orthogonal to the Z direction.
- the blade portion 41 is formed so that the size D in the axial direction (Z direction) gradually decreases from the inner peripheral side to the outer peripheral side of the impeller 4. That is, the impeller 4 (impeller 4) is formed in a mountain shape (mountain shape) so that the inner peripheral side of the impeller 4 projects downward (Z2 direction) in the side view.
- the portion 41a on the inner peripheral side of the blade portion 41 is inclined toward the outer peripheral side. That is, the portion 41a on the inner peripheral side of the blade portion 41 gradually starts from the rotation shaft 1 from the root of the blade portion 41 connected to the plate-shaped portion 40 toward the lower end of the blade portion 41 (the end in the Z2 direction). It is tilted so as to be separated.
- the road cross-sectional area S1 is formed so as to gradually decrease from the inner peripheral side to the outer peripheral side of the impeller 4. That is, the impeller 4 is formed so as to be able to take in a large amount of water on the inner peripheral side that takes in water into the water passage 42 between the plurality of blade portions 41 via the suction port 101a.
- the impeller 4 is formed so that the flow velocity of water can be increased on the outer peripheral side where water is discharged from the water channel 42 between the plurality of blade portions 41 to the outside of the impeller 4. Therefore, the submersible pump 100 is configured to be able to increase the total head by vigorously introducing water into the one-sided water channel 6.
- the impeller 4 is arranged inside, and the pump chamber 5a is provided inside.
- the pump casing 5 forms a part of the uppermost stream of the one-sided water channel 6. That is, the pump casing 5 is provided with an inlet opening 6a for introducing water from the pump chamber 5a into the one-sided water channel 6.
- the pump casing 5 is shown in a divided state (cross section), and the impeller 4 is shown in an undivided state.
- the pump casing 5 includes a pump casing main body 50 and a suction cover 51 that is detachably attached to the pump casing main body 50.
- the suction cover 51 has a suction port 101a.
- the suction cover 51 is removed from the pump casing main body 50 when the impeller 4 is attached to the rotary shaft 1.
- the facing surface 52 facing the blade portion 41 of the pump casing 5 (suction cover 51) from below is viewed from the inner peripheral side when viewed from the direction orthogonal to the axial direction (Z direction) of the rotating shaft 1 (in the side view).
- the impeller 4 is inclined from the inner peripheral side to the outer peripheral side.
- the facing surface 52 of the pump casing 5 is arranged with a substantially constant relatively small gap from the lower end of the blade portion 41 in the side view. Therefore, the facing surface 52 of the pump casing 5 (suction cover 51) is formed so as to be inclined along the blade portion 41 which gradually decreases from the inner peripheral side to the outer peripheral side of the impeller 4 in the side view. ing.
- the pump casing 5 (pump casing main body 50) includes a tongue portion 53 and a connecting water channel (throat) 54.
- the tongue portion 53 is arranged between the pump chamber in which the impeller 4 is arranged and the inlet opening 6a of the one-sided water channel 6 when viewed from the axial direction (Z direction) of the rotating shaft 1.
- the tongue portion 53 is a portion of the pump casing 5 where the spiral volute that collects the water discharged from the water channel 42 between the blade portions 41 of the impeller 4 begins to wind.
- the tongue portion 53 partitions between the vicinity of the center of the pump chamber 5a (near the rotation center axis ⁇ of the rotation axis 1) and the inlet opening 6a of the one-sided water channel 6 when viewed from the axial direction (Z direction) of the rotation axis 1. As such, it extends to the upstream side of the entrance opening 6a.
- the pump casing 5 connects the rotation center axis ⁇ of the rotation axis 1 and the inlet opening 6a by a straight line L when viewed from the axial direction (Z direction) of the rotation axis 1, the rotation center axis ⁇ and the inlet opening 6a are connected.
- the tongue portion 53 is configured to always be located on the straight line L connecting to the tongue portion 53.
- the connecting water channel 54 is a water channel connecting the pump chamber 5a and the one-sided water channel 6.
- the connecting water channel 54 is provided between the inner surface 55 of the pump casing 5 and the tongue portion 53 when viewed from the axial direction (Z direction) of the rotating shaft 1.
- the inner surface 55 of the pump casing 5 is arranged on the outer peripheral side of the tongue portion 53 in the radial direction (R direction) of the rotating shaft 1 (impeller 4) when viewed from the axial direction of the rotating shaft 1.
- the connecting water channel 54 is directly connected to the inlet opening 6a from the upstream side.
- the pump casing 5 is provided on the other end 10b side (Z1 direction side) of the rotating shaft 1 with respect to the connecting water channel 54, and includes the upper surface 56a forming the connecting water channel 54.
- the upper surface 56a forming the connecting water channel 54 connects the inner surface 55 of the pump casing 5 and the tongue portion 53 seen from the axial direction of the rotating shaft 1 to each other.
- the upper surface 56a is an example of a "face" in the claims.
- the pump casing 5 is provided on one end 10a side (Z2 direction side) of the rotating shaft 1 with respect to the connecting water channel 54, and includes a lower surface 56b (see FIG. 2) forming the connecting water channel 54.
- the connecting water channel 54 is formed in a tubular shape connecting the pump chamber 5a and the one-sided water channel 6 by being surrounded by the tongue portion 53, the inner surface 55, the upper surface 56a and the lower surface 56b.
- an oil chamber 7 is provided between the motor 2 and the pump chamber 5a.
- a mechanical seal 70 and an oil lifter 71 are installed in the oil chamber 7.
- an electrode type inundation detection unit may be arranged in the oil chamber 7.
- the pump casing 5 and the motor frame 22 are in direct contact with each other at the contact portion C on the outer peripheral side of the oil chamber 7 so that the oil chamber 7 is not directly sandwiched between the pump casing 5 and the motor frame 22. ing.
- the submersible pump 100 can reduce the component tolerances that must be taken into consideration, so that high assemblability can be ensured.
- a pair of small flange portions FL1 and one large flange portion FL2 are provided at the upper end portion of the pump casing 5.
- the small flange portion FL1 and one large flange portion FL2 are configured to fix the pump casing 5 to the motor frame 22.
- the pair of small flange portions FL1 are provided with one screw hole H10 for attaching a fixing member.
- the large flange portion FL2 has a one-sided water channel 6 arranged inside so as to penetrate the large flange portion FL2.
- the direction in which the rotation axis 1 and the one-sided water channel 6 are lined up is indicated by the A direction
- the direction orthogonal to the A direction is indicated by the B direction. Both the A direction and the B direction are orthogonal to the Z direction.
- the large flange portion FL2 is provided with a pair of screw holes H20 for attaching the fixing member Fa (see FIG. 5) and a pair of screw holes H21 for attaching the fixing member Fb (see FIG. 5).
- the pair of screw holes H20 are arranged near both ends of the large flange portion FL2 in the B direction and on the inner peripheral side of the large flange portion FL2.
- the pair of screw holes H21 are arranged near the outer peripheral end of the large flange portion FL2. Further, the pair of screw holes H21 are arranged inside the pair of screw holes H20 in the B direction. That is, the pair of screw holes H21 are arranged at positions closer to the one-sided water channel 6 than the pair of screw holes H20 in the B direction. Further, the pair of screw holes H21 are arranged inside the range in which the one-sided water channel 6 is provided in the B direction.
- the arrangement of the screw holes H21 close to the one-sided water channel 6 is secured around the reduced portion 22c by the reduced portion 22c (the portion on the Z2 direction side where the appearance shape of the reduced portion 22c becomes smaller) described later of the motor frame 22. It is realized by the space that has been created. Further, the space secured around the reduced portion 22c makes it possible to insert (attach) the fixing members Fa and Fb from the upper side (motor frame 22).
- the pump casing 5 and the motor frame 22 are fixed by the fixing member Fa at a position close to the one-sided water channel 6, so that the pump casing 5 and the motor frame 22 are firmly fixed. , Water leakage from between the pump casing 5 and the motor frame 22 can be effectively suppressed.
- a packing P is installed between the pump casing 5 and the motor frame 22 in the range indicated by the alternate long and short dash line.
- the submersible pump 100 is provided with the position of the screw hole at the outer peripheral end of the large flange portion FL2 at the position indicated by H21. Therefore, when the screw hole is provided near the position indicated by the hatching in FIG. Since the required area of the packing P can be reduced as compared with the above, the pressure applied to the packing P can be increased as compared with the conventional case. As a result of providing the reduction portion 22c and optimizing the position of the screw hole, the submersible pump 100 can secure the watertight state more reliably than before by the packing P.
- the one-sided water channel 6 is formed so that the flow path cross-sectional area S2 gradually decreases from the downstream side toward the upstream side inlet opening 6a.
- the one-sided water channel 6 is formed in a divergent shape in which the flow path cross-sectional area S2 gradually increases from the inlet opening on the upstream side toward the downstream side.
- the one-sided water channel 6 is formed so as to straddle the motor frame 22 and the pump casing 5 as described above, and the flow path is cut off from the motor frame 22 on the downstream side toward the pump casing 5 on the upstream side.
- the area S2 is formed so as to be gradually reduced.
- the one-sided waterway 6 is formed so that the path through which water passes is narrowed in the vicinity of the inlet opening 6a. Therefore, the one-sided water channel 6 can increase the flow velocity of water in the vicinity of the inlet opening 6a.
- the submersible pump 100 is configured to be formed so as to vigorously introduce water into the one-sided water channel 6, so that the total head can be increased.
- the flow path cross-sectional area of the one-sided water channel 6 gradually decreases from the downstream motor frame 22 toward the upstream pump casing 5, and the motor frame 22 is directed from the downstream side to the upstream side.
- a reduction portion 22c is provided in which the appearance shape gradually becomes smaller (see FIG. 5).
- the reduced portion 22c is a lower part of the frame portion 22b. In this way, it is possible to improve the pump performance by providing the reduced portion 22c in which the flow path is narrowed down, and by providing the frame 22b in which the width of the flow path is widened, the water flowing through the flow path is in the motor 2. It is possible to increase the area in contact with the parts and improve the cooling performance for the motor 2.
- the inner surface 60 of the one-sided water channel 6 is formed in a smooth shape (smoothed shape) without a step between the motor frame 22 and the discharge port 101b. That is, the inner surface 60 of the one-sided water channel 6 is formed in a smooth shape without a step in the most downstream portion provided on the bracket 24.
- the inner surface 60 of the one-sided water channel 6 is also formed in a smooth shape without a step in the upstream portion provided in the pump casing 5 and the motor frame 22.
- the submersible pump 100 is configured to be able to increase the total head by forming the inner surface 60 into a smooth shape without steps and reducing the energy loss of water in the one-sided water channel 6. Has been done.
- the pump casing 5 is provided with a connecting water channel 54 that is arranged between the inner surface 55 of the pump casing 5 and the tongue portion 53 and is directly connected to the inlet opening 6a from the upstream side when viewed from the axial direction of the rotating shaft 1. ..
- the pump chamber 5a and the one-sided water channel 6 can be connected to each other via the connecting water channel 54.
- the water flow (flow path cross-sectional area) is narrowed down and the water flow is reduced. Therefore, water can be smoothly flowed into the one-sided water channel 6 at a faster speed. As a result, the total head of the submersible pump 100 can be further increased.
- the one-sided water channel 6 is formed so that the flow path cross-sectional area S2 gradually decreases from the downstream side toward the upstream side inlet opening 6a.
- the flow of water (flow path cross-sectional area S2) can be narrowed down at the inlet opening 6a of the one-sided water channel 6, so that water can flow into the one-sided water channel 6 at a faster speed.
- by changing the flow path cross-sectional area S2 of the one-sided water channel 6 so as to gradually decrease instead of suddenly changing it it is possible to suppress the water flow from being disturbed by the sudden change in the flow path cross-sectional area S2. be able to. As a result, the total head of the submersible pump 100 can be further increased.
- the motor 2 including the motor frame 22 installed with respect to the pump casing 5 from the side opposite to the suction port 101a side in the axial direction is further provided, and the one-side water channel 6 is the motor frame. It is formed so as to straddle the 22 and the pump casing 5, and the flow path cross-sectional area S2 is formed so as to gradually decrease from the motor frame 22 on the downstream side toward the pump casing 5 on the upstream side.
- the one-sided water channel 6 provided in the pump casing 5 but also the one-sided water channel 6 provided in the motor frame 22 can be formed so that the flow path cross-sectional area S2 is gradually reduced, so that it is relatively large.
- the one-sided water channel 6 can be formed over the range so that the channel cross-sectional area S2 gradually becomes smaller. Therefore, since a sudden change in the cross-sectional area S2 of the flow path can be further suppressed, the total head of the submersible pump 100 can be further increased.
- the impeller 4 includes the plate-shaped portion 40 and the blade portion 41 provided on the suction port 101a side of the plate-shaped portion 40, and the blade portion 41 is the blade portion 41.
- the part on the inner peripheral side is inclined toward the outer peripheral side.
- a larger opening portion on the inner peripheral side that first takes in water between the suction port 101a and the blade portion 41 is secured. be able to. Therefore, the suction performance can be improved, the loss on the large flow rate side can be reduced, and the lift on the large flow rate side can be increased.
- the blade portion 41 is formed so that the axial size D gradually decreases from the inner peripheral side to the outer peripheral side of the impeller 4, and the blades of the pump casing 5 are formed.
- the facing surface 52 facing the portion 41 is from the inner peripheral side to the outer peripheral side of the impeller 4 corresponding to the axial size D of the blade portion 41 that gradually decreases when viewed from the direction orthogonal to the axial direction. It is tilted toward.
- the area ratio between the inlet side and the outlet side in the pump casing 5 can be changed to reduce the loss, so that the total head of the submersible pump 100 can be further increased.
- the flow path cross-sectional area S1 of the water channel 42 formed between the blade portions 41 gradually decreases from the inner peripheral side to the outer peripheral side of the impeller 4. It is formed like this.
- the outer diameter of the impeller 4 can be increased by making the blade width on the outer peripheral side (exit side) smaller than that on the inner peripheral side (inlet side), so that the entire submersible pump 100 in the small flow rate range can be used.
- the lift can be further increased.
- the motor 2 including the motor frame 22 installed with respect to the pump casing 5 from the side opposite to the suction port 101a side in the axial direction is further provided, and the inner surface 60 of the one-sided water channel 6 is further provided. Is formed in a smooth shape with no step between the motor frame 22 and the discharge port 101b. As a result, unlike the case where there is a step, it is possible to prevent the flow of water passing through the one-sided water channel 6 from being disturbed, so that the total head of the submersible pump 100 can be further increased.
- the tongue portion 53 has an inlet opening so as to partition between the vicinity of the center of the pump chamber 5a and the inlet opening 6a of the one-sided water channel 6 when viewed from the axial direction of the rotating shaft 1. It extends to the upstream side of 6a.
- the impeller 4 extends in the direction along the flow of water generated in the pump chamber 5a, not in the direction of directly connecting the vicinity of the center of the pump chamber 5a and the inlet opening 6a of the one-sided water channel 6.
- the connecting water channel 54 can be arranged. Therefore, since water can be smoothly flowed from the pump chamber 5a into the connecting water channel 54 at a high speed, the total head of the submersible pump 100 can be further increased.
- the pump casing 5 is provided on the other end 10b side of the rotating shaft 1 with respect to the connecting water channel 54, and includes the upper surface 56a forming the connecting water channel 54 to form the connecting water channel 54.
- the upper surface 56a connects the inner surface 55 of the pump casing 5 and the tongue portion 53 as viewed from the axial direction of the rotating shaft 1 to each other.
- the inner surface 55 of the pump casing 5 and the tongue portion 53 viewed from the axial direction of the rotating shaft 1 are connected to each other, and the upper surface forming the connecting water channel is composed of a separate lid-shaped member different from the pump casing.
- the number of parts can be reduced and the device configuration can be simplified as compared with the case of the above.
- the flow path cross-sectional area S2 of the one-sided water channel 6 gradually decreases from the downstream motor frame 22 toward the upstream pump casing 5.
- a reduction portion 22c is provided from the downstream side to the upstream side, in which the appearance shape gradually decreases.
- the fixing member Fa between the pump casing 5 and the motor frame 22 can be arranged at a position closer to the one-sided water channel 6 due to the space around the reduced portion 22c secured on the pump casing 5 side by the reduced portion 22c. It will be possible. Therefore, the pump casing 5 and the motor frame 22 can be firmly fixed to each other, and water leakage from between the pump casing 5 and the motor frame 22 can be effectively suppressed.
- the length of the tongue portion shown in the above embodiment is only an example, and the tongue portion may be formed longer than the example shown in FIG.
- the tongue may be formed shorter than the example shown in 3.
- a one-sided water channel is formed so that the cross-sectional area of the flow path gradually decreases from the downstream side to the inlet opening on the upstream side
- the present invention is not limited to this.
- a one-sided water channel may be formed so that the cross-sectional area of the flow path gradually increases or does not change from the downstream side to the inlet opening on the upstream side.
- the inner peripheral side portion of the blade portion is inclined toward the outer peripheral side
- the present invention is not limited to this.
- the inner peripheral side portion of the blade portion may be formed so as to extend downward without being inclined toward the outer peripheral side.
- the impeller is formed so that the axial size of the blade portion gradually decreases from the inner peripheral side to the outer peripheral side of the impeller.
- the impeller may be formed so that the axial size of the blade portion is constant.
- the facing surface facing the blade portion of the pump casing is inclined when viewed from a direction orthogonal to the axial direction, but the present invention is not limited to this.
- the facing surface may be formed so as to extend in the horizontal direction.
- the impeller is formed so that the channel cross-sectional area of the water channel formed between the blade portions gradually decreases from the inner peripheral side to the outer peripheral side of the impeller.
- the present invention is not limited to this.
- the impeller is formed so that the channel cross-sectional area of the water channel formed between the blade portions has a constant size that does not change from the inner peripheral side to the outer peripheral side of the impeller. You may.
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Abstract
Description
(水中ポンプの構成)
図1~図3を参照して、本実施形態の水中ポンプ100について説明する。水中ポンプ100は、回転軸1の回転中心軸線αが上下方向(Z方向)に延びる縦型の電動ポンプである。また、水中ポンプ100は、水中ポンプ本体100aの片側に回転軸1に沿って延びる片側水路6が設けられたいわゆる片水路ポンプである。なお、一例ではあるが、本実施形態の水中ポンプ100は、山間におけるトンネルの作業現場など、特に大きな全揚程が必要とされる現場で使用される。
回転軸1は、概して、上下方向(Z方向)に延びる円柱形状を有している。回転軸1は、Z2方向の一端10a(下端)に羽根車4が取り付けられており、Z1方向の他端10b(上端)側にモータ2(回転子21)が固定されている。回転軸1は、モータ2の駆動力を羽根車4に伝達する機能を有している。
モータ2は、回転軸1を回転駆動させるように構成されている。そして、モータ2は、回転軸1を介して羽根車4を回転駆動させるように構成されている。詳細には、モータ2は、コイルを有する固定子20と、固定子20の内周側に配置された回転子21と、モータフレーム22と、上部軸受23aと、下部軸受23bと、ブラケット24とを含んでいる。なお、回転軸1もモータ2に含まれる構成である。
ホースカップリング3は、円筒形状を斜めに切断した形状を有している。すなわち、ホースカップリング3は、円筒形状が延びる方向に対して傾斜した傾斜端面30を有している。
図2に示すように、羽根車4は、ポンプケーシング5の内側のポンプ室5aに配置されている。羽根車4は、セミオープン型の羽根車である。すなわち、羽根車4は、板状部(シュラウド)40と、板状部40の吸込口101a側(下方側)に設けられた複数の羽根部(ベーン)41とを含んでいる。
図3に示すように、ポンプケーシング5は、羽根車4が内側に配置され、内側にポンプ室5aが設けられている。ポンプケーシング5は、片側水路6の最上流の一部分を形成している。すなわち、ポンプケーシング5には、片側水路6にポンプ室5aからの水を導入する入口開口6aが設けられている。なお、図3では、説明の便宜上、ポンプケーシング5を分割した状態(断面)で図示し、羽根車4を分割していない状態で図示している。
図1に示すように、片側水路6は、下流側から上流側の入口開口6aに向けて、流路断面積S2が徐々に小さくなるように形成されている。言い換えると、片側水路6は、上流側の入口開口から下流側に向けて、流路断面積S2が徐々に大きくなる末広がり形状に形成されている。
本実施形態では、以下のような効果を得ることができる。
なお、今回開示された実施形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく請求の範囲によって示され、さらに請求の範囲と均等の意味および範囲内でのすべての変更(変形例)が含まれる。
2 モータ
4 羽根車
5 ポンプケーシング
5a ポンプ室
6 片側水路
6a 入口開口
10a (回転軸の)一端
10b (回転軸の)他端
22 モータフレーム
22c (モータフレームの)縮小部
40 板状部
41 羽根部
42 (羽根部の間に形成される)水路
52 対向面
53 舌部
54 接続水路
55 (ポンプケーシングの)内表面
56a 上面(面)
60 (片側水路の)内表面
100 水中ポンプ
100a 水中ポンプ本体
101a 吸込口
101b 吐出口
Claims (10)
- 水中ポンプ本体(100a)の片側に回転軸(1)に沿って延びる片側水路(6)が設けられた水中ポンプであって、
前記回転軸の一端(10a)に取り付けられる羽根車(4)と、
前記羽根車が内側に配置されたポンプケーシング(5)とを備え、
前記ポンプケーシングは、
前記回転軸の軸方向から見て、前記羽根車が配置されるポンプ室(5a)と前記片側水路の入口開口(6a)との間に配置された舌部(53)と、
前記回転軸の軸方向から見て、前記ポンプケーシングの内表面(55)と前記舌部との間に設けられ、前記入口開口に上流側から直接接続される接続水路(54)とを含む、水中ポンプ(100)。 - 前記片側水路は、下流側から上流側の前記入口開口に向けて、流路断面積が徐々に小さくなるように形成されている、請求項1に記載の水中ポンプ。
- 前記軸方向において、吸込口(101a)側とは逆側から前記ポンプケーシングに対して設置されるモータフレーム(22)を含むモータ(2)をさらに備え、
前記片側水路は、前記モータフレームおよび前記ポンプケーシングに跨るように形成されており、下流側の前記モータフレームから、上流側の前記ポンプケーシングに向けて、流路断面積が徐々に小さくなるように形成されている、請求項2に記載の水中ポンプ。 - 前記羽根車は、板状部(40)と、前記板状部の吸込口(101a)側に設けられた羽根部(41)とを含み、
前記羽根部は、前記羽根部の内周側の部分が外周側に傾斜している、請求項1~3のいずれか1項に記載の水中ポンプ。 - 前記羽根部は、前記軸方向の大きさが、前記羽根車の内周側から外周側に向けて徐々に小さくなるように形成され、
前記ポンプケーシングの前記羽根部に対向する対向面(52)は、前記軸方向に直交する方向から見て、徐々に小さくなる前記羽根部の軸方向の大きさに対応して、前記羽根車の内周側から外周側に向けて傾斜している、請求項4に記載の水中ポンプ。 - 前記羽根車は、前記羽根部の間に形成される水路(42)の流路断面積が前記羽根車の内周側から外周側に向けて徐々に小さくなるように形成されている、請求項4または5に記載の水中ポンプ。
- 前記軸方向において、吸込口(101a)側とは逆側から前記ポンプケーシングに対して設置されるモータフレームを含むモータをさらに備え、
前記片側水路の内表面(60)は、前記モータフレームと吐出口(101b)との間において、段差のない滑らかな形状に形成されている、請求項1~6のいずれか1項に記載の水中ポンプ。 - 前記舌部は、前記回転軸の軸方向から見て、前記ポンプ室の中心付近と前記片側水路の前記入口開口との間を区画するように、前記入口開口よりも上流側まで延びている、請求項1~7のいずれか1項に記載の水中ポンプ。
- 前記ポンプケーシングは、前記接続水路に対して前記回転軸の他端(10b)側に設けられるとともに前記接続水路を形成する面(56a)を含み、
前記接続水路を形成する前記面は、前記回転軸の軸方向から見た前記ポンプケーシングの前記内表面と前記舌部とを互いに接続している、請求項1~8のいずれか1項に記載の水中ポンプ。 - 前記モータフレームには、下流側の前記モータフレームから上流側の前記ポンプケーシングに向けて前記片側水路の流路断面積が徐々に小さくなるのに合わせて、下流側から上流側に向けて、外観形状が徐々に小さくなる縮小部(22c)が設けられている、請求項3に記載の水中ポンプ。
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CN202190000605.4U CN219012992U (zh) | 2020-07-09 | 2021-02-24 | 潜水泵 |
EP21837530.1A EP4180674A1 (en) | 2020-07-09 | 2021-02-24 | Underwater pump |
US18/014,961 US11808266B2 (en) | 2020-07-09 | 2021-02-24 | Submersible pump |
KR1020227040806A KR102525528B1 (ko) | 2020-07-09 | 2021-02-24 | 수중 펌프 |
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US11808266B2 (en) | 2023-11-07 |
KR102525528B1 (ko) | 2023-04-24 |
TWI819282B (zh) | 2023-10-21 |
JP2022015674A (ja) | 2022-01-21 |
CN219012992U (zh) | 2023-05-12 |
TW202217157A (zh) | 2022-05-01 |
US20230193904A1 (en) | 2023-06-22 |
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