JP2009150377A - Submerged pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a submerged pump efficiently discharging slime and the like precipitated on a bottom of water to which a pump part cannot be lowered down. <P>SOLUTION: The slime pump 1 for sucking up precipitation 63 such as the slime precipitated on the bottom of the water is provided with: the pump part 2 for sucking the slime and the like; a stirring rod 3 for stirring the slime and the like; and a skirt part 4 for enclosing around the pump part 2. A retarder 5 rotating while parallel meshing with a pump side gear 26 positioned below the pump part 2 is arranged and the stirring rod 3 is attached to an attaching part 55 for rotating along with rotation of a reduction gear 51 of the retarder 5 and the skirt part 4 is formed in a form for covering a rotation range of the stirring rod 3 and a suck-in port 21 of the pump part 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a submersible pump for sucking up and discharging sedimented slime and earth and sand from the bottom of a hole or the like excavated underwater when constructing a pile or continuous underground wall.

  2. Description of the Related Art Conventionally, submersible pumps that suck up slime or earth and sand precipitated on the bottom of the water are known (see Patent Documents 1 and 2, etc.).

  For example, the slime treatment method disclosed in Patent Document 1 has a configuration in which the slime at the bottom of the water is scraped by a scraper attached to the lower part of the submersible pump and sucked up by the submersible pump.

Moreover, the submersible pump disclosed in Patent Document 2 is provided with a plurality of stages of spiral blades spaced apart in the vertical direction as a disturbing means for stirring the sediment.
Japanese Patent No. 2640841 JP 2003-74487 A

  However, the above-described submersible pump of Patent Document 1 scrapes the accumulated earth and sand directly with the scraper, so that the rotational resistance is large and the driving means for rotating the scraper becomes large. Moreover, since the submersible pump of patent document 2 also provides spiral blades in a plurality of stages, the mechanical height becomes high and the submersible pump becomes large.

  Furthermore, in the submersible pumps disclosed in Patent Documents 1 and 2, there is no means to suppress the rise of the slime or the earth and sand that has risen by the scraper or the disturbance means, so that the slime that has risen up due to being sucked by the submersible pump again settles on the bottom of the water. Will do.

  Then, this invention aims at providing the submersible pump which can discharge | emit efficiently the slime etc. which settled on the water bottom which cannot take down a pump part directly.

  In order to achieve the above object, the submersible pump of the present invention is a submersible pump for sucking up slime or earth and sand that has settled on the bottom of the water, wherein the pump section sucks the slime or earth and sand, and agitation that agitates the slime or earth and sand. And a skirt that surrounds the periphery of the pump unit, and a transmission mechanism that meshes and rotates in parallel with a rotation mechanism that is positioned below the pump unit is provided, and rotates in accordance with the rotation of the transmission mechanism. The agitation part is attached to the attachment part, and the skirt part is shaped to cover the rotation range of the agitation part and the suction port of the pump part.

  Here, the rotating shaft of the transmission mechanism can be configured to be disposed outside the pump unit in plan view.

  Further, the submersible pump of the present invention is a submersible pump for sucking up slime or earth and sand settled on the bottom of the water, wherein the pump part sucks the slime or earth and sand, the stirring part for stirring the slime or earth and sand, and the pump part. A rotation drive mechanism is provided at a position adjacent to the pump unit, and the stirring unit is attached to an attachment unit that rotates as the rotation drive mechanism rotates, and the skirt unit Is formed into a shape that covers the rotation range of the stirring unit and the suction port of the pump unit.

  Further, the skirt portion has an eccentric truncated cone shape, and the pump portion can be arranged on the truncated head.

  Furthermore, the stirring portion can be formed by a cylindrical member.

  Moreover, the clearance gap which connects the inside and outside of a skirt part may be formed between the said skirt part and the said pump part.

  Furthermore, the bottom surface of the stirring unit may be positioned above the bottom surface of the skirt portion, and a protective member may be bridged over the bottom surface opening of the skirt portion.

  The submersible pump of the present invention configured as described above includes a transmission mechanism in parallel with a rotation mechanism positioned below the pump unit, and the agitation unit rotates as the transmission mechanism rotates. Further, the agitation part and the suction port of the pump part are covered with a skirt part.

  That is, since the rotation center of the stirring unit is shifted laterally from the rotation center of the rotation mechanism, slime or the like that has settled on the water bottom where the pump unit cannot be directly lowered can be stirred by the stirring unit. Moreover, even if the slime etc. stirred by the stirring part rises, since a raise is prevented by a skirt part, slime etc. can be efficiently sucked and discharged | emitted.

  In particular, if the rotation shaft of the transmission mechanism is arranged outside the pump unit in plan view, even slime that has settled on the bottom of the water at a position away from the pump unit can be easily stirred and removed. it can.

  Furthermore, the effects as described above can also be obtained by providing a rotation drive mechanism at a position adjacent to the pump unit and configuring the agitation unit to rotate as the rotation drive mechanism rotates.

  In addition, by making the skirt portion into a truncated cone shape, a highly rigid skirt portion that does not hinder the rotation of the stirring portion can be formed with a simple configuration.

  Furthermore, by making the stirring part a columnar member, the resistance received from the slime or the like during stirring can be reduced, and the length can be easily adjusted.

  Moreover, the submersible pump provided with the skirt part can be easily submerged in the water by forming a gap for communicating the inside and outside of the skirt part between the skirt part and the pump part.

  Further, by positioning the bottom surface of the stirring portion above the bottom surface of the skirt portion, the stirring portion can be separated from the water bottom to reduce the rotational resistance, and the protective member is hung over the bottom opening of the skirt portion. The external force which acts on a stirring part from the downward direction can be reduced by etc., and damage to a stirring part can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG.1 and FIG.2 is a figure explaining the structure of the slime pump 1 as a submersible pump of this Embodiment.

  First, in terms of configuration, the slime pump 1 includes a pump unit 2 for sucking slime or earth and sand (hereinafter referred to as “slime”), and a stirring rod 3 as a stirring unit for stirring the slime and the like precipitated on the bottom of the water. The skirt part 4 surrounding the periphery of the pump part 2 is provided.

  The pump unit 2 has a suction port 21 formed at the bottom and a connection port 22 connected to a drainage hose 23 at the top. A motor (not shown) is driven by power supplied by a power cable 24 to slime the pump unit 2. It is a pump that sucks and discharges etc. The pump unit 2 is provided with suspension holes 221 and 221 so as to be suspended in water (see FIG. 2).

  As shown in detail in FIG. 3, the suction port 21 of the pump unit 2 includes a plurality of side holes 21 a provided on the side surface, a center hole 21 b provided in the center of the bottom surface, and a periphery thereof. A plurality of bottom holes 21c,... Are provided, and slime and the like are sucked from these holes.

  In addition, an impeller rotating shaft 26a for rotating the impeller is provided at the center of the central hole 21b of the pump unit 2, but in this embodiment, a pump side gear as a rotating mechanism instead of the impeller. 26 is attached.

  The speed reducer 5 as a transmission mechanism is connected to the pump side gear 26. The reduction gear 5 includes a disk-shaped reduction gear 51, a rotation shaft 52 of the reduction gear 51, a cylinder portion 53 that supports the rotation shaft 52, and an attachment portion 55 to which the stirring rod 3 is attached.

  The reduction gear 51 is a gear larger than the diameter of the pump side gear 26 and is arranged in parallel with the pump side gear 26 and meshes with each other. Further, since the rotation shaft 52 of the reduction gear 51 is erected along the outer periphery of the pump unit 2, the rotation shaft 52 is located outside the pump unit 2 when viewed in plan view.

  The rotating shaft 52 is inserted into the cylindrical portion 53, and the upper end protruding from the cylindrical portion 53 is supported by the bearing portion 25 fixed to the pump portion 2 via the attachment 251. Further, the upper portion of the cylindrical portion 53 is supported by the pump portion 2 via a support member 531, and the lower end is fixed to a flange portion 54 a extending from a bottom plate 54 attached to the bottom surface of the pump portion 2.

  On the other hand, the reduction gear 51 is restricted from moving upward by the flange portion 54a, and an attachment portion 55 for attaching the stirring rod 3 is provided at the center of the lower surface side.

  As shown in FIG. 3, the attachment portion 55 is formed by two disks concentric with the reduction gear 51. Moreover, the reduction gear 51 is provided with a plurality of holes 51a,... Penetrating in the vertical direction, and resistance and buoyancy when submerged in water are reduced.

  The stirring bar 3 is attached to the lower surface of the attachment portion 55. As shown in detail in FIG. 3, the stirring rod 3 is mainly configured by an attachment tube 31 that is fixed to the attachment portion 55 and insertion rods 32 and 32 that are inserted at both ends thereof.

  Since the stirring bar 3 is a cylindrical member and receives little resistance from the slime during rotation, the stirring bar 3 can be easily rotated even if the driving force of the impeller rotary shaft 26a is not large. The shape of the stirring bar 3 is not limited to a cylindrical shape, and a shape having a low resistance such as a triangular prism shape can be arbitrarily selected.

  Further, by adjusting the lengths of the insertion rods 32, 32 inserted into the attachment tube 31, the rotation range can be arbitrarily adjusted by changing the length of the stirring rod 3.

  And the skirt part 4 which covers the rotation range of this stirring rod 3 and the suction inlet 21 of the pump part 2 is formed in the eccentric truncated cone shape, as shown in FIG. That is, the center of the bottom surface opening 4b and the center of the upper head portion 4a are deviated from each other. As seen in the cross-sectional view of FIG. 1, the pump part 2 is disposed at one end of the skirt part 4, and the skirt part 4 It has a shape that spreads in the opposite direction to the pump part 2.

  As shown in FIG. 2, the skirt portion 4 includes two-stage ring members 431 and 431 that form a framework of the bottom portion, and a skeleton member 43 that extends obliquely upward from the upper edge toward the outer periphery of the pump portion 2. ... and the outer shell part 44 which covers the outer periphery of the ring materials 431, 431 and the skeleton members 43, .... The ring material 431, the frame material 43, and the outer shell portion 44 can be formed of a steel material such as a steel frame or a steel plate.

  As shown in FIGS. 1 and 2, the bottom opening 4b of the skirt portion 4 has a horizontal member 42a spanning the inner periphery of the lower ring member 431 and a ring orthogonal to the horizontal member 42a. The protective member 42 formed in the shape of a fence is provided by the fixing members 42b and 42b attached to the inner periphery of the member 431.

  Here, as shown in FIG. 1, the bottom surface of the stirring bar 3 is disposed at a position separated from the top surface of the protection member 42, and the protection member 42 does not hinder the rotation of the stirring bar 3. . Further, since both ends of the stirring bar 3 are protected by the protection member 42, before the slime or earth and sand collides with the stirring bar 3 from below, the protection member 42 prevents the end of the stirring bar 3 from warping. It will not be deformed by going up.

  In addition, a gap 41 is provided between the outer periphery of the pump portion 2 and the upper edge of the outer shell portion 44 in the heel portion 4a of the skirt portion 4, so that water can freely move in and out of the skirt portion 4. It is like that.

  Next, an example of the usage method of the slime pump 1 of this Embodiment is demonstrated, referring FIG.

  This FIG. 4 is a figure explaining the process of constructing an expanded bottom pile. First, in order to construct an expanded pile, the cylindrical shaft portion 60 and the diameter of the shaft portion 60 were gradually expanded downward while filling the excavation hole with fluid for stabilizing the hole wall such as bentonite mud. The pile hole 6 provided with the widening portion 61 having a truncated cone shape is excavated.

  At the hole bottom 62 of the pile hole 6, earth and sand, slime, and the like generated by excavation are settled as time passes to form a precipitate 63. And if concrete is placed with such a deposit 63 being deposited, the concrete cannot be filled up to the hole bottom 62, or the quality of the concrete deteriorates, and an expanded pile with the desired strength and quality is constructed. There is a risk that it will not be possible.

  Therefore, the sediment 63 on the hole bottom 62 is removed, but at the beginning when the amount of the sediment 63 is large, the bottom scooping bucket or the like is put into the pile hole 6 to efficiently remove the sediment 63. Can do.

  However, as shown by a two-dot chain line in FIG. 4, after the reinforcing bar 7 is put into the pile hole 6, the reinforcing bar 7 becomes a hindrance so that the bottomed bucket cannot be put in. On the other hand, when a normal submersible pump is used, the sediment 63 on the hole bottom 62 just below the shaft portion 60 can be removed, but the sediment 63 on the hole bottom 62 of the widened portion 61 cannot be removed.

  Therefore, the slime pump 1 of the present embodiment is used. That is, as shown in FIG. 4, when the slime pump 1 is inserted into the inside of the reinforcing bar rod 7 of the pile hole 6 and the slime pump 1 is brought close to the end of the reinforcing rod rod 7, the pump unit 2 is connected to the end of the reinforcing bar rod 7. Although it is arranged directly below, the skirt portion 4 spreads toward the widened portion 61 from there.

  For this reason, the widened part of the skirt part 4 of the slime pump 1 can be inserted into the hidden part of the widened part 61 that cannot be seen from directly above the shaft part 60. Then, when the stirring rod 3 is rotated inside the skirt portion 4, the sediment 63 rises and the skirt portion 4 is filled with slime and the like, and the slime and the like are efficiently sucked from the suction port 21 of the pump portion 2. The inside of the drainage hose 23 can be conveyed and discharged to the outside of the pile hole 6.

  The slime pump 1 can discharge the slime at any time, regardless of the presence or absence of the reinforcing bar 7, so that the high-quality expanded pile can be constructed by operating the slime pump 1 until just before placing concrete. be able to.

  Next, the operation of the slime pump 1 of the present embodiment will be described.

  The slime pump 1 of the present embodiment configured as described above includes a reduction gear 5 in parallel with a pump-side gear 26 located below the pump portion 2, and the stirring rod 3 is moved along with the rotation of the reduction gear 5. Rotate. That is, since the rotation center of the stirring rod 3 is shifted laterally from the rotation center of the pump side gear 26, the sediment precipitated on the hole bottom 62 of the widened portion 61 of the pile hole 6 where the pump portion 2 cannot be directly lowered. The object 63 can be stirred by the stirring bar 3.

  In particular, if the rotating shaft 52 of the speed reducer 5 is disposed outside the pump unit 2 in a plan view, even if it is a slime or the like that has settled on the bottom of the water at a position away from the pump unit 2, it can be easily stirred. Can be discharged.

  Further, if the transmission mechanism is configured with a single gear like the reduction gear 51, the height of the skirt portion 4 and the slime pump 1 can be kept low, so that the pump with a simple configuration that is easy to handle is wide. A range of precipitates 63 can be removed.

  Further, by increasing the diameter of the reduction gear 51, the rotation center of the stirring rod 3 can be located further away from the pump unit 2, so that the widening portion 61 can be accommodated. Moreover, by setting the transmission mechanism to a configuration in which a plurality of gears are combined, the position of the rotation center of the stirring rod 3 can be easily adjusted, and the rotation speed and the rotation load can be easily adjusted.

  The stirring rod 3 and the suction port 21 of the pump unit 2 are covered with the skirt portion 4. For this reason, even if the sediment 63 is stirred by the stirring rod 3 and the slime rises, the skirt portion 4 prevents the rise, so that the slime and the like can be efficiently sucked and discharged.

  Further, by making the skirt portion 4 into an eccentric frustoconical shape, the highly rigid skirt portion 4 that does not hinder the rotation of the stirring rod 3 can be formed with a simple configuration.

  Furthermore, the slime pump 1 provided with the skirt part 4 can be easily submerged by forming a gap 41 between the skirt part 4 and the pump part 2 to communicate the inside and outside of the skirt part 4. That is, if the upper opening edge of the outer shell portion 44 of the skirt portion 4 is in close contact with the pump portion 2 and there is no gap, it is difficult for air to accumulate inside the skirt portion 4 and sink into water, but the gap 41 is formed. Since the air does not accumulate, the slime pump 1 can be easily submerged in water. If the gap 41 is only provided around the pump part 2, most of the slime and the like that is stirred up by the stirring rod 3 and drifts inside the skirt part 4 is sucked into the pump part 2. It will be.

  Furthermore, by making the stirring rod 3 a cylindrical member, the resistance received from the slime or the like during stirring can be reduced, and the length can be easily adjusted. That is, when the resistance applied to the stirring bar 3 increases, the torque of the impeller rotary shaft 26a must be increased to rotate the stirring rod 3, or the transmission mechanism must be configured in a complicated configuration combining a plurality of gears. If the purpose is to stir the precipitate 63 instead of scraping the precipitate 63 as in the case of the above, the structure of the rotation mechanism and the transmission mechanism is simplified by making the stirring rod 3 into a shape with less resistance. Can be configured.

  Further, by positioning the bottom surface of the stirring rod 3 above the bottom surface of the skirt portion 4, the stirring rod 3 can be separated from the water bottom to reduce the rotational resistance, and a protective member 42 is provided on the bottom surface opening 4 b of the skirt portion 4. By passing over, the external force which acts on the stirring rod 3 from below by earth or sand can be reduced, and damage to the stirring rod 3 can be prevented. That is, when the slime pump 1 is attached to the hole bottom 62, the bottom surface of the outer edge of the skirt portion 4 and the protective member 42 collide with the precipitate 63 first, so that the precipitate 63 contacts the stirring rod 3 after that. However, the stirring rod 3 hardly deforms or is damaged.

  Hereinafter, in this example, a submersible pump different from the embodiment described in the above embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  A slime pump 1A as a submersible pump described in this example includes a rotation drive mechanism 8 instead of the speed reducer 5 of the slime pump 1 described in the above embodiment.

  That is, the slime pump 1A includes a pump unit 2 for sucking slime and the like, a stirring rod 3A as a stirring unit for stirring the slime and the like precipitated on the bottom of the water, a rotation drive mechanism 8 for rotating the stirring rod 3A, and a pump unit. 2 and a skirt portion 4 surrounding the periphery of 2.

  The pump unit 2 has a suction port 21 formed at the bottom and a connection port 22 connected to a drainage hose 23 at the top. A motor (not shown) is driven by power supplied by a power cable 24 to slime the pump unit 2. It is a pump that sucks and discharges etc.

  Moreover, in the said embodiment, although the flange part 54a was extended from the bottom face plate 54 of the lower end of the pump part 2, the bottom face board 27 of this Example is not provided with a flange part, and is shape | molded in disk shape. Has been.

  The rotation drive mechanism 8 includes a submersible motor 81 serving as a driving source, a motor rotating shaft 82 that rotates by driving the submersible motor 81, and a power cable 84 that supplies power for driving the submersible motor 81. .

  The submersible motor 81 is arranged in parallel at a position adjacent to the pump unit 2 and is supported by the pump unit 2 by support members 83 and 83 attached to the pump unit 2.

  Further, the motor rotating shaft 82 of the submersible motor 81 serves as an attachment portion, and the stirring rod 3A is attached to the lower end of the motor rotating shaft 82.

  The stirring rod 3A is extended by the same length on both sides around the motor rotation shaft 82, and the inner space in which the skirt portion 4 spreads as much as possible without contacting the inner surface of the skirt portion 4. It is formed in a length that can be stirred in a wide range.

  In the slime pump 1A of the embodiment configured as described above, the rotation drive mechanism 8 is provided at a position adjacent to the pump unit 2, and the stirring rod 3A is rotated by the rotation drive mechanism 8. That is, since the rotation center of the stirring bar 3A is shifted laterally from the center of the pump part 2, the sediment 63 precipitated on the hole bottom 62 of the widened part 61 of the pile hole 6 where the pump part 2 cannot be directly lowered. Can be stirred by the stirring rod 3A.

  Moreover, since the height of the skirt part 4 and the slime pump 1A as a whole can be kept low if the submersible motor 81 is arranged in parallel with the pump part 2, a wide range of sediments can be obtained with a pump having a simple configuration that is easy to handle. 63 can be removed.

  Furthermore, since the submersible motor 81 separate from the pump unit 2 is used, the slime pump 1A can be manufactured using the general-purpose pump unit 2. Further, since the driving source is different, the suction force of the pump unit 2 is not reduced by the load that rotates the stirring rod 3A. Furthermore, the rotational speed and rotational load of the stirring rod 3A can be adjusted independently by adjusting the standard and output of the submersible motor 81.

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment or example, and the design does not depart from the gist of the present invention. Such modifications are included in the present invention.

  For example, in the present embodiment, the case where the impeller rotating shaft 26a of the impeller for earth and sand feeding provided in the normal pump unit 2 is used as the driving source of the rotating mechanism has been described, but the present invention is not limited to this. Instead, a rotation drive device may be provided separately to form the rotation mechanism.

  Moreover, although the said embodiment and the Example demonstrated the skirt part 4 of the truncated cone shape, it is not limited to this, The stirring rod 3 (3A), such as a truncated quadrangular pyramid and a truncated hexagonal pyramid, is shown. Any shape can be selected as long as it does not hinder rotation.

  Furthermore, in the said embodiment and Example, although the fence-shaped member was used as the protection member 42, it is not limited to this, The penetration | invasion of the sediment 63 into the skirt part 4, such as a strip | belt shape and a net shape, is prevented. If not, it can be in any form.

  Moreover, in the said Example, although 3 A of stirring rods were directly attached to the lower end of the motor rotating shaft 82 as an attaching part, it is not limited to this, A gearwheel (not shown, FIG. 1) is attached to the motor rotating shaft 82. The pump side gear 26 is attached, and a reduction gear (not shown, see the reduction gear 51 in FIG. 1) arranged in parallel with the gear is engaged, and the lower end of the rotation shaft (not shown) of the reduction gear is engaged. It can also be an attachment.

  Moreover, although the said embodiment and Example demonstrated the case where the sediment 63 which settled on the hole bottom 62 of the expanded pile was removed with the slime pump 1 (1A), it is not limited to this, The present invention can be applied to all scenes in which slime or earth and sand precipitated at the bottom is discharged.

It is sectional drawing explaining the structure of the slime pump of the best embodiment of this invention. It is a perspective view explaining the structure of the slime pump of the best embodiment of this invention by fracture | rupturing a part of outer shell part. It is a perspective view explaining the attachment relation of a pump part, a reduction gear, and a stirring rod. It is explanatory drawing explaining the usage pattern of a slime pump. It is sectional drawing explaining the structure of the slime pump of an Example.

Explanation of symbols

1,1A slime pump (submersible pump)
2 Pump unit 21 Suction port 26 Pump side gear (rotating mechanism)
26a Impeller rotating shaft (rotating mechanism)
3,3A Stir bar (stirring section)
4 Skirt part 4a Gutter head part 4b Bottom opening 41 Clearance 42 Protective member 5 Reducer (transmission mechanism)
52 Rotating shaft 55 Mounting part 63 Sediment (slime or earth and sand)
8 Rotation drive mechanism 82 Motor rotation shaft (mounting part)

Claims (7)

A submersible pump for sucking up slime or sediment deposited on the bottom of the water,
A pump section for sucking the slime or earth and sand;
A stirring section for stirring the slime or earth and sand;
A skirt portion surrounding the pump portion;
A transmission mechanism that meshes and rotates in parallel with a rotation mechanism positioned below the pump unit is provided, and the stirring unit is attached to an attachment unit that rotates as the transmission mechanism rotates, and the skirt portion is A submersible pump, wherein the submersible pump is formed into a shape that covers a rotation range of the stirring unit and a suction port of the pump unit.   The submersible pump according to claim 1, wherein a rotation shaft of the transmission mechanism is disposed outside the pump unit in a plan view. A submersible pump for sucking up slime or sediment deposited on the bottom of the water,
A pump section for sucking the slime or earth and sand;
A stirring section for stirring the slime or earth and sand;
A skirt portion surrounding the pump portion;
A rotation drive mechanism is provided at a position adjacent to the pump unit, and the agitation unit is attached to an attachment unit that rotates along with the rotation of the rotation drive mechanism, and the skirt portion includes a rotation range of the agitation unit and the pump. A submersible pump characterized by being formed into a shape that covers a suction port of a part.   The submersible pump according to any one of claims 1 to 3, wherein the skirt portion has an eccentric truncated conical shape, and the pump portion is disposed on the truncated head.   The submersible pump according to any one of claims 1 to 4, wherein the stirring unit is a cylindrical member.   The submersible pump according to any one of claims 1 to 5, wherein a gap is formed between the skirt portion and the pump portion to communicate the inside and outside of the skirt portion.   The bottom surface of the stirring unit is located above the bottom surface of the skirt portion, and a protective member is bridged over the bottom surface opening of the skirt portion. Submersible pump as described.

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