JP2005188490A - Sand pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently pump up water comprising soil to discharge it outside by injecting water and agitating it to float without generating clogging of a nozzle with the soil when injecting the water comprising soil from the nozzle with pressure-feeding water thereof. <P>SOLUTION: A suction opening 15 is provided to suck water contaminated with foreign materials with rotation of rotary blades 13, and a discharge opening 19 is provided to discharge the described water. The inner peripheral surface of a strainer housing 27 detachably attached to the discharge opening 19 is provided with a filtration member 33 having a filtration surface 31 along a flowing direction of the described water. The water filtered by the filtration member 33 is discharged from a plurality of nozzles 41 to a part near the suction opening 15. Since the water containing soil is filtered by the filtration member 33, clogging of the nozzle 41 with soil can be prevented. Since the filtration surface 31 of the filtration member 33 is formed along the flowing direction of the water, the filtration surface 31 is always cleaned by a flow of the water to prevent deposition of foreign materials on the filtration surface 31. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sand pump, in particular, a sand pump that discharges earth and sand and other foreign matters from a sewage treatment plant, an overpass pipe, a manhole in a manhole, and a civil engineering site to the outside. The present invention relates to a sand pump that injects from a nozzle with pressure-feed water, efficiently stirs and floats, and pumps it efficiently to the outside.

  Conventionally, when a hole or groove is excavated in the ground, slime is deposited on the bottom surface of the hole or groove. Since this slime forms a soft layer on the bottom surface, the supporting force is remarkably reduced. Moreover, when concrete is poured into the holes or grooves, the difference in specific gravity between the slime and concrete is small and the fluidity of the slime is small, so that the slime is mixed into the concrete and weakens the concrete strength. For this reason, the slime is sucked and removed using an underwater sand pump. However, as described above, slime has a low fluidity and is difficult to remove completely.

  In addition to the above slime, soil and other foreign matter such as sewage treatment plants, overpass pipes, manholes, and civil engineering sites are sucked up using an underwater sand pump and discharged to the outside. Yes.

  However, the conventional submersible sand pump discharges only the earth and sand collected under the suction port, and there is a problem that the earth and sand slightly separated from the suction port cannot be discharged.

Therefore, the water pipe is branched from the pumping path of the submersible pump, and the jet spray water flow utilizing the drainage pressure head is blown from the nozzle to the slime and earth and sand through the water pipe, and the slime and earth and sand are lifted up, There is a slime processing apparatus that sucks and discharges the outside (see, for example, Patent Document 1).
JP-A-53-14903

  By the way, in the conventional sand pump, especially the slime processing apparatus of Patent Document 1, if the waste water discharged from the pump main body (pump casing) is used as it is and sprayed from the nozzle, the waste water contains earth and sand. There was a problem that the nozzle was clogged.

  In addition, since the nozzles arranged around the suction port of the sand pump are directed downwards, it is difficult to lift the sand slightly away from it even if the soil in the sprayed area floats up. Therefore, there has been a problem that it is difficult to efficiently discharge earth and sand at a position slightly away from the suction port.

  In addition, the conventional submersible sand pump, when air enters the pump body (pump casing) during low water level operation, the air accumulates near the rotary blade and the upper wall of the pump casing, which greatly reduces the suction power of the pump. There is a problem that an air lock phenomenon is caused. For this reason, there has been a problem that it is difficult to perform low water level operation which has a large effect of discharging earth and sand.

  The present invention has been made to solve the above-described problems.

The sand pump of the present invention is provided with a suction port for sucking water mixed with foreign matters by rotation of the rotor blades, and a sand pump having a discharge port for discharging the water,
A filter member having a filtration surface along the flow direction of the water is provided on the inner peripheral surface of the strainer housing that is attachable to and detachable from the discharge port, and a plurality of units that discharge water filtered by the filter member to the vicinity of the suction port. This is characterized in that a nozzle is provided.

  In the sand pump of the present invention, it is preferable that the sand pump is provided with an air vent for discharging air on the upper side of the discharge port.

  In the sand pump of the present invention, in the sand pump, the plurality of nozzles are directed in a downward direction around the suction port or in an outward direction slightly away from the suction port in order to soar the earth and sand around the suction port. In addition, it is preferably directed in a direction along the rotation direction of the rotor blade.

  In the sand pump according to the present invention, in the sand pump, it is preferable that the filtering member has a cylindrical shape, and an annular cavity is provided on an outer peripheral portion of the filtering member.

  As understood from the means for solving the problems as described above, according to the present invention, the wastewater containing earth and sand is filtered by the filtering member provided on the inner peripheral surface of the strainer housing, and then the plurality of nozzles. Since it is injected near the suction port, it is possible to prevent the nozzle from being clogged with earth and sand.

  Further, since the filtration member has a filtration surface along the flow direction of water on the inner peripheral surface of the strainer housing, the filtration surface is always cleaned by the flow of water, so that foreign matter is trapped in the filtration surface. It can be prevented from accumulating.

  Furthermore, since an air vent is provided on the upper side of the discharge port, the occurrence of an air lock phenomenon can be prevented. Therefore, since a stable suction force can be maintained even during low water level operation, it is possible to increase the effect of discharging earth and sand and the like due to low water level operation.

  Further, since the plurality of nozzles are directed in the downward direction around the suction port or in the outward direction slightly away from the suction port, the earth and sand at a position slightly away from the suction port is easily lifted by the jet flow from the nozzle. In addition, since the plurality of nozzles are oriented in the direction along the rotation direction of the rotor blades, the earth and sand at a position slightly away from the suction port swirls in substantially the same direction as the rotor blade rotation direction by the jet flow from the nozzles Therefore, the swirled earth and sand are more easily sucked from the suction port, and the earth and sand can be discharged efficiently.

  Moreover, since the annular cavity part is provided in the outer peripheral part of the filtration member, since the area of a filtration surface increases, the injection flow rate from a nozzle can be increased. As a result, the effect of stirring the earth and sand by the jet flow from the nozzle can be increased.

  Embodiments of the present invention will be described below with reference to the drawings.

  Referring to FIGS. 1 and 2, the sand pump 1 according to this embodiment is a pump that discharges earth and sand and other foreign matters from a sewage treatment plant, an overpass pipe, a sand pool in a manhole, and a civil engineering site. is there. The sand pump 1 includes a pump main body 3. The pump main body 3 includes a motor (not shown), and a lower part of the pump main body 3 has a spiral pump chamber 5 having a gradually increasing cross-sectional area and the pump chamber 5. A pump casing 9 having an impeller chamber 7 for generating a vortex in the pump chamber 5 is provided. The rotating shaft 11 of the motor protrudes into the impeller chamber 7 of the pump casing 9, and an impeller 13 including a plurality of impellers as rotating blades is provided at the protruding portion of the rotating shaft 11. The impeller 13 is configured to rotate in the impeller chamber 7 in the same direction as the spiral direction of the pump chamber 5 and in the clockwise direction as indicated by an arrow in FIG.

  Further, a bottom plate 17 having a suction port 15 for sucking water mixed with the earth and sand and other foreign matters is provided at the lower part of the pump casing 9. Further, the water sucked from the suction port 15 is discharged to the spiral final portion of the pump chamber 5 of the pump casing 9, that is, from the same position as the side wall surface of the left impeller chamber 7 in FIG. A discharge port 19 is provided. The cross-sectional shape of the discharge port 19 has an extended region that changes to a substantially circular shape in a direction in which the cross-sectional area gradually increases, and a flange portion 21 is provided at the end of the extended region. Note that support legs 23 are provided at a plurality of locations on the lower surface of the bottom plate 17.

  3 and 4 together, for example, an air vent groove 25 as an air vent portion communicating with the side wall surface of the impeller chamber 7 is provided on the upper side of the extended region of the discharge port 19. The air vent groove 25 is for allowing the air to flow out to the discharge port 19 in order to prevent an air lock phenomenon due to air staying on the side wall of the impeller chamber 7. Note that the air vent may be an air vent that communicates from the side wall surface of the impeller chamber 7 to the extended region of the discharge port 19.

  A strainer housing 27 detachably attached to the discharge port 19 is connected to the flange portion 21 of the discharge port 19 with a plurality of bolts via a packing 29. The strainer housing 27 has a drainage channel for discharging water discharged from the discharge port 19, and an inner peripheral surface of the drainage channel has a water flow direction as shown in FIG. A filtering member 33 having a filtering surface 31 along is provided.

  As shown in FIG. 3, the filter member 33 of this embodiment is provided with a hole 35 for filtration formed of a large number of small punch holes through a cylindrical steel plate. An annular cavity 37 is provided in the strainer housing 27 on the outer periphery of the filtration member 33, and a large number of filtration holes 35 of the filtration member 33 communicate with the cavity 37. In this embodiment, the hollow portion 37 is formed from a wide groove portion formed on the inner peripheral surface side of the strainer housing 27 over the entire circumference, and the filter member 33 covering the groove portion over the entire circumference. ing.

  In addition, as other embodiment of said filter member 33, a cloth may be sufficient, or many holes 35 for filtration are provided in the cylindrical board of the material different from a steel plate. Or other forms.

  The strainer housing 27 is connected to an injection pipe 39 communicating with the hollow portion 37, and the injection pipe 39 is branched and arranged at a plurality of locations around the pump casing 9. The supplied water is configured to be discharged from the plurality of nozzles 41 to the vicinity of the suction port 15.

  In this embodiment, the plurality of nozzles 41 are directed downward in the vicinity of the suction port 15 or outwardly slightly away from the suction port 15 as shown in FIGS. 1 and 2, and the impeller It is directed in a direction along 13 rotation directions.

  A corner drain pipe 43 is detachably connected to the front end of the strainer housing 27, and a drain pipe 45 for discharging the water to the outside is connected to the front end of the corner drain pipe 43. Yes. Further, a shaft holder 49 guided by a guide pipe 47 extending in the vertical direction is provided on the upper portion of the strainer housing 27.

  A lifting bolt 51 is provided on the upper part of the pump body 3, and a chain 53 that is driven up and down by, for example, a crane or a winding mechanism is connected to the lifting bolt 51. Therefore, the sand pump 1 is moved up and down by the chain 53 while being guided by the guide pipe 47 installed in advance, so that the strainer housing 27 and the corner drain pipe 43 communicate with each other.

  With the above configuration, when the motor in the pump body 3 is driven, the rotating shaft 11 rotates, the impeller 13 rotates in the clockwise direction of the arrow in FIG. 2, and the water flows by centrifugal force in the spiral pump chamber 5. As shown in FIG. 5, water mixed with earth and sand and other foreign matters is sucked from the suction port 15. The sucked water is discharged from the pump chamber 5 through the discharge port 19 to the drainage passage of the strainer housing 27, and is discharged to the outside through the corner drainage pipe 43 and the drainage pipe 45.

  At this time, a part of the water including earth and sand that passes through the drainage channel of the strainer housing 27 is filtered through the numerous filtering holes 35 of the filtering member 33 and then flows into the cavity 37, from the cavity 37. Since a plurality of nozzles 41 around the pump casing 9 are discharged from the plurality of nozzles 41 around the pump casing 9 to the vicinity of the outside of the suction port 15, the earth and sand around the suction port 15 can be efficiently raised. The plurality of nozzles 41 are directed downward in the periphery of the suction port 15 or outwardly slightly away from the suction port 15, so that the earth and sand at a position slightly away from the suction port 15 is ejected from the nozzle 41. Makes it easier to float.

  Moreover, since the plurality of nozzles 41 are directed in the direction along the rotation direction of the impeller 13, the earth and sand at a position slightly away from the suction port 15 is substantially the same as the rotation direction of the impeller 13 by the jet flow from the plurality of nozzles 41. It will be in a state of turning in the direction. As a result, the swirled earth and sand are more easily sucked from the suction port 15, and the earth and sand can be discharged efficiently.

  As described above, the stirrability varies depending on the directivity angle of the nozzle 41 and the number of the nozzles 41. Therefore, it is desirable to change the directivity angle and the quantity of the nozzle 41 according to the situation.

  Further, as described above, since the water containing earth and sand is filtered by the filtering member 33 and then sprayed to the vicinity of the suction port 15 by the plurality of nozzles 41, the situation where the nozzle 41 is clogged with earth and sand as in the past is prevented. it can.

  In addition, the filtration surface 31 of the filtration member 33 is provided on the inner peripheral surface of the drainage passage of the strainer housing 27 in a direction along the direction of water flow, so-called cross flow in which the water flow direction and the filtration surface 31 are in the same direction. Since the filter system 31 is used, the filtration surface 31 is always cleaned by the flow of water, so that foreign matter can be prevented from accumulating on the filtration surface 31.

  Further, since the outer circumferential portion of the filtration member 33 is provided with a wide and annular cavity 37 over the entire circumference, the area of the filtration surface 31 increases, so that the water flowing into the cavity 37 increases. The injection flow rate from the nozzle 41 can be increased, and the effect of stirring the earth and sand by the injection flow from the nozzle 41 is increased.

  In addition, since the filter member 33 is provided in the strainer housing 27 in front of the discharge port 19, the filter member 33 can be easily inspected.

  Further, if the water level is lowered as much as possible, the effect of discharging sediment and the like becomes large, so that the low water level operation may be performed. However, if air enters the pump casing 9 during the low water level operation, the impeller chamber 7 Since air accumulates in the vicinity of the side wall, an air lock phenomenon occurs. As a countermeasure against this air lock phenomenon, in this embodiment, since the air vent groove 25 is provided on the upper side of the extended region of the discharge port 19, the air is not collected near the side wall of the impeller chamber 7. It is discharged from the groove 25 to the outside of the discharge port 19 and the occurrence of the air lock phenomenon can be prevented. That is, since air does not stay in the impeller chamber 7, an efficient vortex can be generated, and the suction force from the suction port 15 can be stabilized.

  Therefore, in the sand pump 1 according to the embodiment of the present invention, as shown in FIG. 1, the continuous operation lowest water level L is slightly higher than the pump casing 9, and the low water level in the vicinity of the lowest water level L described above. Since a stable suction force can be maintained even during operation, the effect of discharging earth and sand can be increased. Accordingly, it is possible to use a motor that can be continuously operated in the air (including an air-cooled motor having a large heat capacity).

  When the rotation of the motor of the pump body 3 is stopped and the operation of the sand pump 1 is stopped, the water in the drainage pipe 45 and the corner drainage pipe 43 flows backward as shown in FIG. It will flow out from the suction port 15 downward. In this embodiment, as described above, the filtration surface 31 of the filtration member 33 is a cross flow system, so even if foreign matter accumulates on the filtration surface 31 of the filtration member 33, it can be removed by the above-described reverse flow. .

  Since the strainer housing 27 is detachably attached to the flange portion 21, the filtration member 33 can be easily replaced and maintained by removing the strainer housing 27 from the flange portion 21.

1 is an overall schematic explanatory view of a sand pump according to an embodiment of the present invention. It is a top view of FIG. It is the elements on larger scale of the discharge outlet and strainer housing of FIG. FIG. 4 is a partial side view of view IV in FIG. 3. It is a schematic explanatory drawing which shows the flow of the waste_water | drain during driving | operation of a sand pump. It is a schematic explanatory drawing which shows the backflow state of the waste_water | drain at the time of operation stop of a sand pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sand pump 3 Pump main body 5 Pump chamber 7 Impeller chamber 9 Pump casing 11 Rotating shaft 13 Impeller (rotary blade)
15 Suction port 19 Discharge port 25 Air vent groove (air vent)
27 Strainer housing 31 Filter surface 33 Filter member 35 Filter hole 37 Cavity 39 Injection pipe 41 Nozzle 43 Corner drain pipe 45 Drain pipe

Claims (4)

In a sand pump comprising a suction port for sucking water mixed with foreign matters by rotation of the rotor blades, and a discharge port for discharging the water,
A filter member having a filtration surface along the flow direction of the water is provided on the inner peripheral surface of the strainer housing that can be attached to and detached from the discharge port, and a plurality of pieces of water that are filtered by the filter member are discharged to the vicinity of the suction port. Sand pump characterized by having a nozzle.   The sand pump according to claim 1, further comprising an air vent for discharging air on an upper side of the discharge port.   The plurality of nozzles are directed in a downward direction around the suction port or in an outward direction slightly away from the suction port, and in a direction along the rotation direction of the rotor blades, so as to soar the earth and sand around the suction port The sand pump according to claim 1, wherein the sand pump is directed toward the surface. The sand pump according to claim 1, 2 or 3, wherein the filter member has a cylindrical shape, and an annular cavity is provided on an outer periphery of the filter member.

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