EP2930367B1 - Pump blade for submerged pump and submerged pump having same - Google Patents

Pump blade for submerged pump and submerged pump having same Download PDF

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Publication number
EP2930367B1
EP2930367B1 EP14819908.6A EP14819908A EP2930367B1 EP 2930367 B1 EP2930367 B1 EP 2930367B1 EP 14819908 A EP14819908 A EP 14819908A EP 2930367 B1 EP2930367 B1 EP 2930367B1
Authority
EP
European Patent Office
Prior art keywords
pump impeller
flow channels
pump
intake port
flow channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP14819908.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2930367A1 (en
EP2930367A4 (en
Inventor
Masahito Kawai
Hiromi Sakacho
Masashi Obuchi
Hiroshi Uchida
Miho ISONO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebara Corp
Original Assignee
Ebara Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Ebara Corp filed Critical Ebara Corp
Publication of EP2930367A1 publication Critical patent/EP2930367A1/en
Publication of EP2930367A4 publication Critical patent/EP2930367A4/en
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Revoked legal-status Critical Current
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Classifications

    • 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
    • F04D29/2238—Special flow patterns
    • F04D29/225—Channel wheels, e.g. one blade or one flow channel
    • 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
    • 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
    • F04D29/2238—Special flow patterns
    • F04D29/2255—Special flow patterns flow-channels with a special cross-section contour, e.g. ejecting, throttling or diffusing effect
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing 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
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous

Definitions

  • the present invention relates to a pump impeller for a submerged pump, and in particular to a pump impeller for a submerged pump for sewage and a submerged pump provided with the impeller.
  • a pump impeller 111 as illustrated in Figure 9 is used within the submerged pump (see JP 4 713 066 B2 ).
  • the pump impeller 111 is generally in a cylindrical shape, which includes an intake port 129 formed at one end and a discharge port 134 formed laterally on the side of the other end, and a spiral flow channel 135 partitioned and formed therein, connecting the intake port 129 with the discharge port 134.
  • the pump impeller 111 further includes a flange portion 140 that protrudes outward along the circumferential surface of the pump impeller 111 from a portion closer to the intake port than the discharge port 134 on the circumferential surface and separates the intake port side from the discharge port side.
  • the pump impeller 111 is contained in a pump casing 112 and connected to a closed-type submerged motor 113 for rotatably driving the pump impeller 111.
  • the submerged motor 113 includes a motor 116 having a stator 114 and a rotor 115 and a motor casing 117 that covers the motor 116.
  • a driving shaft 118 extending vertically is provided at the center portion of the rotor 115.
  • the driving shaft 118 is rotatably supported by bearings 119 and 120 at the upper end portion and an intermediate portion on the lower side, respectively.
  • the pump impeller 111 is then connected to the lower end portion of the driving shaft 118.
  • a pump chamber 126 which is partitioned by an inner wall 125 that is recessed in a semicircular shape in its cross section, is formed within the pump casing 112.
  • a discharge portion 138 of the pump impeller 111 is contained in the pump chamber 126.
  • An intake portion 121 that protrudes downward is formed in the lower portion of the pump casing 112.
  • An intake port 122 that is open downward is formed in the intake portion 121.
  • a discharge portion 123 that protrudes laterally is formed on the side portion of the pump casing 112.
  • the discharge portion 123 includes a discharge port 124 formed therein, which is open laterally.
  • the pump impeller 111 is provided with an intake portion 127 and a discharge portion 128 axially from the lower side toward the upper side in this order.
  • the intake portion 127 and the discharge portion 128 are both formed generally in a cylindrical shape, and the discharge portion 128 is constructed to have a diameter larger than the intake portion 127.
  • the discharge portion 128 is separated from the intake portion 127 by the flange portion 140 that protrudes outward from the circumferential surface of the pump impeller 11.
  • An intake port 129 that is open downward is formed at the lower end of the intake portion 127 of the pump impeller 111.
  • the upper side of the discharge portion 128 is covered by an upper end wall. In other words, the upper side of the pump impeller 111 is hermetically closed by the upper end wall.
  • a hole is provided at the center portion of the upper end wall for inserting a distal end of the driv-ing shaft 118, and a periphery of the hole constitutes a mounting portion 131 for mounting the driving shaft 118.
  • the reference numeral 137 denotes a secondary flow channel and the reference numeral 138 denotes a secondary blade.
  • JP H09 209 963 A which relates to an impeller for a pump for carrying solid matter.
  • An inner diameter of a casing of the pump is set to be larger than an outer diameter of the impeller so that a scroll of a specified interval can be formed to an outer circumference of the impeller.
  • the impeller has a suction port at a center, and a discharge port in an outer circumference, which are connected by a flow passage.
  • the flow passage is spirally curved, and is separated into two branches at the suction port.
  • the pump impeller 111 In the pump impeller 111 according to JP 4 713 066 B2 , one flow channel continues from the intake port 129 to the discharge port 134.
  • the pump impeller 111 is adapted to take in sewage from the intake port 129 that is open downward in coaxial with the driving shaft 118, and the sewage is drained from the discharge port 134 through the one spiral flow channel.
  • the area where the spiral flow channel is formed is weightless because it is hollow space.
  • the area forming the wall of the pump impeller 111 has weight. For this reason, the weight of the pump impeller 111 is significantly eccentrically distributed in the circumference direction with respect to the axis (center of rotation) of the driving shaft 118. When such pump impeller 111 rotates, the deviation of the weight of fluid also increases with respect to the center of rotation, which is likely to cause a radial load.
  • the above-mentioned "dynamic, balance” is defined herein as displacement of the center of gravity and the center of moment with respect to the axis of rotation when an impeller is rotated in the atmosphere.
  • the dynamic balance can be removed by a correction such as thinning of the wall as described above.
  • the fluid balance refers to balance in the case where a fluid is flowing in a channel while a pump impeller is rotating. Even if the dynamic balance is optimized (zero weight unbalance), the area of water (sewage) in the pump impeller is eccentric with respect to the axis of rotation when the pump impeller is rotated under water. This causes fluid unbalance and a force (which is referred to as a radial load) is applied to the pump impeller via the wall pressure.
  • a multi-channel pump impeller such as that in the present invention can significantly reduce the radial load because the mass distribution of the water area is less likely to be non-axisymmetric as compared to a single-channel pump impeller.
  • WO 2012115452 A2 discloses a multi channel pump impeller according to the preamble of the claim 1. In view of the above description, a specific solution to the problem is as described below.
  • the present invention which has been made in view of the above problem, provides a pump impeller as set forth in claim 1, Further embodiments are inter alia disclosed in the dependent claims.
  • the pump impeller is for a non-clogging submerged pump and includes a generally cylindrical body, an intake port provided in a center of a lower end surface of the body, a discharge port that is open in a side surface of the body, and a flow channel passing from the intake port to the discharge port within the body.
  • the flow channel includes a plurality of flow channels, and the flow channels have their size, shape, and position defined such that fluid unbalance is reduced with respect to an axis of rotation.
  • sewage taken in from the intake port is divided and flows into each of the flow channels.
  • fluid unbalance is less likely to occur with respect to the axis of rotation because the flow channels are designed to reduce the fluid unbalance, and thus the occurrence of radial load associated with rotation of the pump impeller can significantly be suppressed.
  • the flow channel includes two or more flow channels. According to the configuration, sewage is drained more than once per revolution of the pump impeller, and thus pressure variation during drainage can be suppressed.
  • a cross-sectional area of the flow channel varies between the intake port and the discharge port.
  • sewage when sewage separates from a surface of the flow channel near the discharge port, sewage may be prevented from being taken in from the intake port. Accordingly, the varying cross-sectional area is provided in some positions in order to maintain the pressure above a predetermined level.
  • a cross-sectional shape of the flow channel varies between the intake port and the discharge port. Furthermore, in a fifth aspect, the cross-sectional shape of the flow channel changes from circular to generally rectangular or elliptic from the intake port toward the discharge port.
  • the intake port is circular and an upstream portion of the flow channel is also circular; while the circumferential surface of the pump impeller has a shape similar to that of a circumferential surface of a cylinder. Accordingly, the cross-sectional shape needs to be changed near the discharge port in order to secure a constant cross-sectional area.
  • an inner wall surface of the flow channel is formed of a continuous curved surface. According to the configuration, foreign matters in sewage flow smoothly in the flow channel so that the occurrence of clogging or the like due to the foreign matters can be prevented.
  • inner walls close to a junction of at least two of the flow channels have a surface roughness different from each other.
  • elongated fibrous foreign matters may be divided and flow into two flow channels at a junction close to the intake port.
  • the frictional resistance is lower on the side of a flow channel having a smoother surface, so that the foreign matters are likely to flow in the side of the flow channel.
  • all of the flow channels have the same size and shape, and are disposed at an equal angular interval with respect to the axis of rotation. According to the configuration, sewage taken in from the intake port is divided and flows into each of the flow channels. At this time, since the flow channels have the same size and shape, and are disposed in positions located at an equal angular interval with respect to the axis of rotation, no weight unbalance with respect to the axis of rotation occurs, and thus the occurrence of radial load associated with rotation of the pump impeller can be minimized.
  • a submerged pump is characterized by including a pump impeller according to any one of the first to eighth aspects, a pump casing that contains the pump impeller; and a motor that drives the pump impeller. According to the configuration, a pump having a good fluid balance can be realized when assembled and operated as a pump, without problems such as noise and vibration.
  • a pump impeller according to an embodiment of the preset invention will now be described with reference to Figures 1 to 8 .
  • the pump impeller of the invention includes a plurality of flow channels that bring an intake port coaxial with an axis of rotation into communication with a discharge port on an outer circumferential portion and the flow channels are disposed at an equal angular interval with respect to the axis of rotation by logical add.
  • the number of flow channels are not limited, Figures 3(A) to 5(B) illustrate an embodiment with two flow channels, and Figures 6(A) to 8(B) illustrate an embodiment with three flow channels.
  • the flow channels are bent in a curved shape between the intake port and the discharge port.
  • the pump impeller is produced by casting. However, as long as strength or corrosion resistance can be secured, any other metal or non-metal material may be used.
  • Figure 1(A) is an image by computer graphics, illustrating a flow channel 3 used in a pump impeller.
  • the flow channel is coaxial with the axis of rotation C near the intake port 5.
  • the central axis of the flow channel 3 near the intake port 5 is parallel to and coincident with the axis of rotation C.
  • the central axis of the flow channel 3 extends downward and then radially outward with respect to the axis of rotation C.
  • a transitional portion from the direction of the axis of rotation to the radially outward direction is formed of a continuous curve.
  • the central axis of the flow channel 3 extends radially outward, it further extends circumferentially with respect to the axis of rotation C. Accordingly, as a result of a combination of the radially outward component with the circumferential component, the central axis of the flow channel 3 extends outward in a spiral manner.
  • the cross-sectional shape of the flow channel 3 is a complete circle near the intake port 5, while it is rectangular near the discharge port 7. Accordingly, a transitional region from the intake port 5 toward the discharge port 7 continuously changes such that a circle gradually turns into a rectangle. Note that even though the term rectangle is used, corner portions do not have right-angled surfaces but are formed of curves of a small radius of curvature. This arrangement is for preventing foreign matters from being accumulated in the corner portions.
  • Figure 1(A) illustrates a logical shape of the flow channel 3; when applied to an actual pump impeller, an outer edge of the pump impeller is circular about the axis of rotation C. Specifically, an ellipse illustrated in Figure 1(A) defines the outer edge of the pump impeller. Accordingly, an actual flow channel 3 formed in the pump impeller has a shape as illustrated in Figure 1(B) in which the discharge port 7 is formed over a broad angular range.
  • the shape of the flow channel 3 used in a pump impeller has been described. This description, however, is of a case in which only one flow channel 3 is provided. As described below, the invention is characterized by a combination of two flow channels, and thus a specific example thereof will be described.
  • Figure 2(A) illustrates a configuration that includes two flow channels 13A and 13B and that has been subjected to logical add with reference to the axis of rotation C (intake port).
  • the flow channels 13A and 13B have completely the same size and shape as each other and are located at point-symmetric positions with respect to the central axis C.
  • the flow channel 3 in Figures 1(A) and 1(B) is rotationally copied and disposed at an equal angular interval.
  • regions where the flow channels 13A and 13B are directed radially outward from an intake port 15 extend in directions mutually spaced by 180° (opposite directions).
  • the logical add used herein refers to simply combining two flow channels with a common intake port.
  • FIG 2(B) illustrates actual flow channels 13A and 13B by the outer edge of the pump impeller (illustrated by a dotted line), similarly to Figure 1(B) .
  • the flow channels 13A and 13B are completely point-symmetric with respect to the axis of rotation C, and form a generally S-shaped flow channel as a whole.
  • discharge ports 17A and 17B are formed over a broad angular range, similarly to the example in Figure 1(B) .
  • Figures 3 are views of a pump impeller 11 according to the embodiment created by computer graphics.
  • Figure 3(A) is a view seen obliquely from the intake port 15 side
  • Figure 3(B) is a view seen from the side.
  • Flow channels formed inside the pump impeller 11 illustrated in the figure are the flow channels 13A and 13B illustrated in Figure 2(B) .
  • the cross-sectional shape of a flow channel is nearly circular on the right side (upstream side) of the axis of rotation C, while it is in a shape forming a part of a rectangle on the left side (downstream side) of the axis of rotation.
  • Figures 4(A), 4(B) and 4(C) illustrate the pump impeller 11 of the embodiment, and are a plan view, a side view, and a bottom view, respectively.
  • a cylindrical hub 14 is formed in a region of the central axis C, and the hub 14 is adapted to receive an inserted driving shaft (not illustrated) of a driving motor.
  • the pump impeller 11 is adapted to rotate at the number of revolution on the order of 1500 rpm. However, if efficiency can be improved, the pump impeller may be rotated at any number of revolution that is lower or higher than 1500 rpm.
  • FIG. 5(A) is a sectional view taken along the line 5A-5A in Figure 4(B) .
  • the pump impeller 11 includes an intake port 15 formed therein that is open to one side of the central axis C, and sewage is taken in as the pump impeller 11 rotates. The sewage is then transported from the intake port 15 circumferentially outward along the flow channels 13A and 13B, finally drained from the discharge ports 17A and 17B.
  • a driving shaft is inserted in the opening as described above, and thus the sewage will not leak from the opening.
  • FIG. 5(B) is a sectional view taken along the line 5B-5B in Figure 4(B) .
  • the flow channels 13A and 13B continuing from the intake port 15 extend radially outward in a spiral manner, and provide discharge ports 17A and 17B on the outer edge of the pump impeller 11. Accordingly, other portions than the flow channels are wall portions constituting the pump impeller 11.
  • the discharge ports 17A and 17B of the embodiment are formed in an angular range of approximately 180° with respect to the central axis C. This is based on a basic idea that there are two flow channels 13A and 13B and that efficiency is improved by forming discharge ports 17A and 17B over as broad angular range as possible.
  • a pump casing 16 is also illustrated for convenience in explanation. Description will be made later as to how the pump impeller 11 and the pump casing 16 are related.
  • the intake port 15 is cylindrical and is open so as to be coaxial with the axis of rotation C. Accordingly, the intake port 15 is formed as substantially common one port by logical add.
  • the intake port 15 is disposed so as to be open downward when it is actually installed in a pump.
  • the inner diameter of the intake port 15 is set based on the volume of solid matters contained in sewage handled by the pump impeller 11.
  • the flow channels 13A and 13B branch out from one intake port 15 into two flow channels, as described above.
  • the flow channels 13A and 13B have approximately the same cross-sectional area from near the intake port 15 up to the junction.
  • the cross-sectional area is gradually reduced from the junction toward the downstream. This is because if the cross-sectional area of each of the flow channels 13A and 13B is equivalent to the cross-sectional area of the intake port 15 after branching, the sum of the areas doubles and the pressure of sewage decreases, which may cause a separation phenomenon of sewage from an inner surface of the flow channels 13A and 13B.
  • the rate of decrease in the cross-sectional area of the flow channels 13A and 13B after branching varies depending on the nature of sewage handled or parameters such as the number of revolution of the pump impeller 11. For example, when the viscosity of sewage is high, the separation phenomenon is less likely to occur so that the rate of decrease in the cross-sectional area may be small. When the number of revolution of the pump impeller 11 is high, then the separation phenomenon is likely to occur so that the rate of decrease in the cross-sectional area may desirably be increased.
  • the cross-sectional area of the flow channels 13A and 13B after branching is approximately 0.55 (in the case of two flow channels) per unit of the cross-sectional area of the intake port 15.
  • the inner wall surfaces of the flow channels 13A and 13B near the junction is formed to have a surface roughness different from each other. This is to address the case in which fibrous objects (elongated string-like objects) are preset in sewage. For example, assume that a fibrous object on the order of several tens of centimeters long is preset in sewage. In this case, opposite ends of the fibrous object may possibly flow in two flow channels 13A and 13B separately. If such a case happens, the fibrous object sticks to and remains in the junction.
  • fibrous objects elongated string-like objects
  • the fibrous object is allowed to flow in one of the flow channels 13A and 13B smoothly.
  • the inner surface of one flow channel 13A is smoothened, and the inner surface of the other flow channel 13B is formed in a roughened state (for example, as-cast state).
  • the frictional resistance on the fibrous object is lower on the smooth inner surface, and to the contrary, the coefficient of friction is higher on the rough inner surface.
  • Such imbalance in the coefficient of friction allows the fibrous object to flow in the side of the flow channel having the smooth inner surface. In this way, a possible problem that may be associated with two flow channels 13A and 13B can be solved by intentionally altering the surface roughness.
  • the flow channels 13A and 13B are subjected to a pressure drop.
  • sewage is taken in from the intake port 15.
  • the cross-sectional area of the flow channels 13A and 13B is defined to prevent sewage from separating from the inner surface of the flow channels 13A and 13B near the discharge ports 17A and 17B, as described above.
  • the cross-sectional area of the flow channels 13A and 13B may be gradually changed from the intake port 15 toward the discharge ports 17A and 17B, or may be constant in a predetermined section and constant at a different scale in other sections.
  • the flow channels 13A and 13B of the embodiment have a cross-sectional shape that changes from circular to rectangular between the intake port 15 and the discharge ports 17A and 17B.
  • these cross-sectional shapes are only exemplary. Sequentially from the intake port 15 to discharge ports 17A and 17B, other combinations not belonging to the claimed invention may be made, for example: circular -> a transitional region -> elliptic, or circular -> a transitional region -> elliptic -> a transitional region -> rectangular.
  • rectangular in the embodiment refers to a square, an oblong cross-sectional shape may be used.
  • All inner wall surfaces of the flow channels 13A and 13B are formed of a continuous curved surface. This is to prevent the flow channels 13A and 13B from being clogged with foreign matters.
  • the cross-sectional shape of the flow channels 13A and 13B is rectangular near the discharge ports 17A and 17B. Corner portions of the cross-section are not completely right-angled but are connected by a continuous curved surface.
  • a longitudinal. axis (a line connecting sectional centers from the intake port 15 to the discharge ports 17A and 17B) of the flow channels 13A and 13B is also continuous. In this way, foreign matters are prevented from being caught in the flow channels 13A and 13B while sewage is flowing.
  • Figures 6(A), 6(B) and 7 are views for describing a pump impeller 21 with three flow channels according to a second embodiment.
  • Figure 6(A) corresponds to Figure 2(A) of the first embodiment
  • Figure 6(B) corresponds to Figure 2(B)
  • Figure 7 corresponds to Figure 5 .
  • Figures 6(A) and 6(B) illustrate three flow channels 23A, 23B and 23C disposed in positions located at an equal angular interval around an intake port 25.
  • the flow channels 23A, 23B and 23C have completely the same size and shape as each other and formed by rotationally copying the flow channel in Figures 1(A) and 1(B) and disposing them at an equal angular interval with respect to the central axis C. Accordingly, as illustrated in Figure 6(B) , regions where the flow channels 23A, 23B and 23C are directed radially outward from the intake port 25 extend in directions mutually spaced by 120°.
  • Figure 6(B) illustrates actual flow channels 23A, 23B and 23C by an outer edge of the pump impeller 23 (illustrated by a dotted line), similarly to Figure 2(B) .
  • discharge ports 27A, 27B and 27C are formed over a broad angular range (approximately 120°), similarly to the example in Figure 2(B) .
  • Figure 7 is a sectional view illustrating a pump impeller housed in an actual pump casing 26.
  • sewage is drained by one third per rotation from three flow channels 23A, 23B and 23C, respectively.
  • the drain flow rate is the same, pressure variation occurring during drainage is kept lower than that of the pump impeller 11 of the first embodiment with two flow channels.
  • a pump impeller capable of reducing fluid balance is not necessarily limited to the pump impeller of the above configuration.
  • the fluid balance can be reduced when one flow channel is thinner and the remaining two flow channels are thicker, as illustrated in Figure 8(A) .
  • a combination of two thinner flow channels and one thicker flow channel is also possible.
  • the fluid balance can be reduced when angular intervals between flow channels are unequal.
  • an intermittent flow (pulsation) in a volute can be increased to enhance drainability for foreign matters.
  • FIG. 9 is a sectional view of a submerged pump 60 provided with the pump impeller 11 according to the embodiment as described above.
  • the pump impeller 11 is contained in a pump casing 62 and connected to a closed-type submerged motor 63 for rotatably driving the pump impeller 11.
  • the submerged motor 63 includes a motor 66 having a stator 64 and a rotor 65, and a motor casing 67 that covers the motor 66.
  • a driving shaft 68 extending vertically is provided at the center portion of the rotor 65.
  • the driving shaft 68 is rotatably supported by bearings 69 and 70 at the upper end portion and an intermediate portion on the lower side, respectively.
  • the pump impeller 11 is then connected to the lower end portion of the driving shaft 68.
  • a pump chamber 76 which is partitioned by an inner wall 75 that is recessed in a semicircular shape in its cross section, is formed within the pump casing 62.
  • a discharge portion 68 of the pump impeller 11 is contained in the pump chamber 76.
  • An intake portion 71 that protrudes downward is formed in the lower portion of the pump casing 62.
  • An intake port 72 that is open downward is formed in the intake portion 71.
  • a drain portion 73 that protrudes laterally is formed on the side portion of the pump casing 62.
  • the drain portion 73 includes a drain port 74 formed therein, which is open laterally.
  • a pump impeller according to the preset invention can be particularly useful for a submerged pump for sewage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP14819908.6A 2013-07-05 2014-04-15 Pump blade for submerged pump and submerged pump having same Revoked EP2930367B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013141415A JP6351216B2 (ja) 2013-07-05 2013-07-05 水中ポンプ用ポンプ羽根及びこれを備えた水中ポンプ
PCT/JP2014/060657 WO2015001830A1 (ja) 2013-07-05 2014-04-15 水中ポンプ用ポンプ羽根及びこれを備えた水中ポンプ

Publications (3)

Publication Number Publication Date
EP2930367A1 EP2930367A1 (en) 2015-10-14
EP2930367A4 EP2930367A4 (en) 2016-11-02
EP2930367B1 true EP2930367B1 (en) 2020-05-27

Family

ID=52143424

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14819908.6A Revoked EP2930367B1 (en) 2013-07-05 2014-04-15 Pump blade for submerged pump and submerged pump having same

Country Status (7)

Country Link
US (1) US20160108927A1 (pt)
EP (1) EP2930367B1 (pt)
JP (1) JP6351216B2 (pt)
CN (1) CN104662302B (pt)
BR (1) BR112015009797B1 (pt)
DK (1) DK2930367T3 (pt)
WO (1) WO2015001830A1 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2930367B1 (en) 2013-07-05 2020-05-27 Ebara Corporation Pump blade for submerged pump and submerged pump having same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
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EP2930367B1 (en) 2013-07-05 2020-05-27 Ebara Corporation Pump blade for submerged pump and submerged pump having same

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BR112015009797B1 (pt) 2022-03-15
DK2930367T3 (da) 2020-06-29
US20160108927A1 (en) 2016-04-21
EP2930367A4 (en) 2016-11-02
BR112015009797A8 (pt) 2017-08-01
BR112015009797A2 (pt) 2017-07-11
JP2015014251A (ja) 2015-01-22
JP6351216B2 (ja) 2018-07-04
WO2015001830A1 (ja) 2015-01-08
CN104662302A (zh) 2015-05-27
CN104662302B (zh) 2017-11-28

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