JP5300508B2 - Pump impeller and pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump impeller optimally designing a discharge capacity without being influenced by the maximum passing particle diameter and promoting passage of solid material having the maximum passing particle diameter. <P>SOLUTION: This impeller 52 rotates around a rotating axis M in the vortex chamber 53a of a casing 53 and includes a single blade 60 having shrouds 61 at both sides in the direction of the rotating axis M. In the impeller 52, an outer flow passage 68 formed in an outer surface between the shrouds 61 of the impeller 52 keeps the same maximum passing particle diameter as that of an inner flow passage 67 in a portion having the maximum flow passage width leading to the impeller outlet 66 of the inner flow passage 67 inside of the impeller 52 and is smaller than the maximum passing particle diameter by gradually reducing flow passage depth, and an interval between the shrouds is enlarged toward radially outward of the impeller 52 in at least a portion corresponding to the maximum flow passage width of the outer flow passage 68. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a pump impeller and a pump, and relates to a technique for preventing clogging of foreign matters in a flow path of the impeller.

  Conventionally, there are pumps of this type that handle fluids such as sewage. As shown in FIG. 9, the pump 1 is arranged in a vortex chamber 3 a in which an impeller 2 forms a predetermined shape of a pump casing 3. In the pump casing 3, a casing suction port 4 provided in the lower part opens toward the rotational axis direction of the impeller 2, and a casing discharge port 5 provided in a side portion communicating with the vortex chamber 3 a is provided in the impeller 2. It opens toward the same direction as the tangential direction of the rotation axis.

  The impeller 2 has a single blade 6 that spirally extends from the rotational axis side to the radially outer side, and shrouds 7 are formed on both sides of the single blade 6 in the rotational axis direction. In the single blade 6, an edge close to the rotation axis side forms a blade inlet portion 8, and an edge located on the peripheral edge forms a blade outlet portion 9, from the blade inlet portion 8 toward the blade outlet portion 9. A spiral inner flow path 10 is formed. The inner flow path 10 communicates with the casing suction port 4 and communicates with the vortex chamber 3 a at the blade outlet portion 9.

  There exists what is described in patent document 1 in the impeller in this kind of pump, and it shows in FIGS. 6-8. Here, the same components as those previously described with reference to FIG. 6 is a cross-sectional view orthogonal to the impeller shaft center, FIGS. 7A to 7D are cross-sectional views at various angles around the shaft center, and FIG. 8 is an opening of the impeller. FIG.

  As shown in FIG. 6, the impeller 2 has a single blade 6 extending in a spiral shape, and as shown in FIG. 7, the inner flow path 10 of the blade 6 keeps the cross-sectional diameter constant to catch dirt. It is preventing. As shown in FIG. 8, an outflow port 11 that forms an outer flow path communicating with the inner flow path 10 is formed on the outer surface of the impeller 2, and the flow path width of the outflow port 11 is inversely proportional to the flow velocity. Thus, a portion having a slow radial partial velocity is formed as a large portion 11a, a portion having a high radial partial velocity is made narrow, and the reaction force of the drainage movement exerted on the impeller 2 is made constant over the entire circumference. This prevents the vibration of No. 2 and enables high-head drainage.

Japanese Patent Publication No.49-13522

  By the way, in a pump used for transporting a liquid containing solid matter, in order to avoid clogging the solid matter inside the pump, there may be used an impeller having a large passage particle size set in the flow passage cross section. . However, if the maximum flow path width of the outer flow path formed on the outer surface of the impeller, that is, the width between the shrouds is increased, the discharge capacity increases, and there is a situation in which liquid with a capacity more than necessary for the equipment using the pump is discharged. May occur.

  For this reason, the outer passage formed on the outer surface between the shrouds of the impeller keeps the maximum passage particle size at the portion of the largest passage width that continues to the blade outlet portion of the inner passage, and gradually increases the passage width or passage depth. By reducing the size to be smaller than the maximum passing particle size, it is possible to optimally design the discharge capacity without being influenced by the maximum passing particle size while allowing the solid material having the maximum passing particle size to pass through.

  However, in this configuration, when the solid matter has a maximum passage particle size or a size close thereto, the solid matter is clogged between the shrouds at the portion of the maximum passage width that extends from the blade outlet portion of the inner passage to the outer passage. It becomes easy.

  The present invention solves the above-described problems, and provides an impeller of a pump that can optimally design a discharge capacity without being affected by the maximum passing particle diameter and that allows solids to easily pass therethrough. With the goal.

In order to solve the above problems, an impeller of a pump according to the present invention is an impeller comprising a single blade that rotates around a rotation axis in a vortex chamber of a casing and has shrouds on both sides in the direction of the rotation axis. The outer passage formed on the outer surface between the shrouds of the car maintains the maximum passage particle size equivalent to that of the inner passage at the portion of the largest passage width that follows the blade outlet portion of the inner passage inside the impeller, and the passage width The flow path depth is gradually decreased to make it smaller than the maximum passage particle size, and the shroud is spaced at least in the portion corresponding to the maximum flow path width of the outer flow path so that the mutual distance is directed radially outward of the impeller. It spreads, and both opposing surfaces make a flat inclined surface, It is characterized by the above-mentioned.

  The pump according to the present invention includes a casing having a suction port and a discharge port, and having a vortex chamber in which an impeller is disposed, and the impeller includes any one of the impellers described above. .

  In the above configuration, the fluid and solids ejected from the inner channel to the outer channel due to the rotation of the impeller flow out of the casing through the vortex chamber of the casing. At this time, the portion of the maximum flow width that extends from the blade outlet portion of the inner flow passage to the outer flow passage contains the maximum particle size portion of the solid matter between the shrouds, but at least the maximum flow of the outer flow passage is between the shrouds. Since the portion corresponding to the road width spreads outward in the radial direction of the impeller, the passage of the solid material having the maximum passing particle diameter is promoted to prevent clogging of the solid material between the shrouds. Naturally, it is possible to reduce the possibility of clogging between the shrouds with solids smaller than the maximum passing particle diameter. Therefore, it is possible to realize a pump impeller and a pump that optimize the discharge capacity without being affected by the maximum passing particle diameter.

The schematic diagram which shows the pump in embodiment of this invention External view of impeller in same embodiment External view of impeller in same embodiment Sectional drawing in each angle around the shaft center of the impeller in the same embodiment Schematic showing the pump in the same embodiment Sectional view orthogonal to the axis of a conventional impeller Cross-sectional view at various angles around the axis of a conventional impeller Development view of the opening of a conventional impeller Schematic diagram showing a conventional pump

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5, a pump 51 handles fluid such as sewage, and an impeller 52 is disposed inside a vortex chamber 53 a having a predetermined shape of a pump casing 53.

  In the pump casing 53, a casing suction port 54 provided in the lower part opens toward the rotational axis direction of the impeller 52, and a casing discharge port 55 provided in a side portion communicating with the vortex chamber 53 a has an impeller 52. It opens toward the same direction as the tangential direction of the rotation axis. The impeller 52 is rotationally driven around the rotational axis M by a drive machine (not shown) such as a motor.

  The impeller 52 has a single blade 60 that spirally extends from the rotational axis side to the radially outer side, and shrouds 61 are formed on both sides of the single blade 60 in the rotational axis direction. A boss 63 having a hole 62 for connecting a drive shaft (not shown) is formed on the upper shroud 61, and a rim 64 that slides with the pump casing 53 is formed around the boss 63. It is.

  In the single blade 60, an edge close to the rotation axis side forms a blade inlet portion 65, and an edge located on the peripheral side forms a blade outlet portion 66, from the blade inlet portion 65 toward the blade outlet portion 66. A spiral inner flow path 67 is formed. The inner flow path 67 communicates with the casing suction port 54, and communicates with the vortex chamber 53 a at the blade outlet portion 66.

An outer flow path 68 is formed on the outer surface of the single blade 60 between the shrouds 61 of the impeller 52. The outer flow path 68 extends in a direction opposite to the rotation direction of the impeller 52, and a portion following the blade outlet portion 66 of the inner flow path 67 has a maximum flow path width and is the maximum passage particle equivalent to the inner flow path 67. The diameter is maintained, and the flow path width and the flow path depth are gradually reduced as it extends in the direction opposite to the rotation direction, so that it is smaller than the maximum passing particle diameter .

  And as shown in FIG. 1, the space | interval of the shroud 61 of both sides has spread toward the radial direction outer side of the impeller 52, and the opposing surface of both the shrouds 61 makes the inclined surface 61a. The inclined surface 61a of the shroud 61 may be provided on the entire circumference, but it may be provided in a range corresponding to at least the maximum flow path width of the outer flow path 68, and may be provided on the facing surface of at least one shroud 61. Good. Furthermore, the shape of the inclined surface 61a is not limited to a flat surface, and may be a curved surface.

  Hereinafter, the operation of the above-described configuration will be described. In a state where the impeller 52 rotates around the rotation axis M in the chamber of the pump casing 53, the fluid and solid matter sucked from the casing suction port 54 flows into the inner flow path 67, and centrifugal force applied by the rotation of the impeller 52. In response, the fluid and the solid matter flow out from the blade outlet 66 of the blade 60 to the vortex chamber 53 a, swirl along the inner surface of the casing 53, and are discharged from the casing discharge port 55.

  At this time, as the channel width and the channel depth of the outer channel 68 decrease, the portion of the solid material protruding from the outer channel 68 increases, and the outer channel 68 from the blade outlet 66 of the inner channel 67 increases. In the portion of the maximum flow path width that follows, the maximum particle size portion of the solid is included between the shrouds 61, but the distance between the shrouds 61 is at least the impeller 52 in the portion corresponding to the maximum flow width of the outer flow path 68. Therefore, it is possible to prevent the solid matter from being clogged between the shrouds 61 by promoting the passage of the solid matter having the maximum passing particle diameter or a size close thereto. Therefore, the discharge capacity can be optimally designed without being affected by the maximum passing particle diameter.

51 pump 52 impeller 53 pump casing 53a vortex chamber 54 casing suction port 55 casing discharge port 60 single blade 61 shroud 61a inclined surface 62 hole 63 boss part 64 rim part 65 blade inlet part 66 blade outlet part 67 inner flow path 68 outer side Flow path M Rotation axis

Claims (2)

An impeller comprising a single blade having a shroud rotating around a rotation axis in a vortex chamber of the casing and having shrouds on both sides in the direction of the rotation axis. Maintain the maximum passage particle size equivalent to the inner passage at the portion of the maximum passage width that follows the blade outlet of the inner inner passage, and gradually reduce the passage width and passage depth from the maximum passage particle size. The shroud is configured such that, at least in the portion corresponding to the maximum flow path width of the outer flow path, the distance between each other extends outward in the radial direction of the impeller, and both opposing surfaces form a flat inclined surface. A pump impeller characterized.   A pump comprising a casing having a suction port and a discharge port, and having a vortex chamber in which an impeller is disposed, wherein the impeller comprises the impeller according to claim 1.

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