JP7187170B2 - Impeller and self-priming pump device - Google Patents

Description

The present invention relates to an impeller used in a self-priming pump device and a self-priming pump device.

When starting the self-priming pump device, if the flow path from the suction port to which the pumping pipe is connected to the discharge port to which the water pipe for sending water to the destination is not filled with water, Perform self-priming. For self-priming pump equipment, if the flow path from the suction port to the discharge port is filled with water at the start of startup, or after the start-up, the flow path from the suction port to the discharge port will be filled with water due to self-priming operation. When filled, pumping operation is performed to increase the pressure of water and discharge it to the secondary side. Such a pump device includes a pump casing having a suction port and a discharge port, and an impeller rotated by a motor.

The pump casing includes a suction chamber communicating with the suction port, a pump chamber located on the secondary side of the suction chamber and housing the impeller, and a discharge chamber located on the secondary side of the pump chamber and communicating with the discharge port. , is equipped with In the self-priming operation, water in the suction chamber is mixed with air as the impeller rotates, and is discharged into the discharge chamber as gas-liquid mixed water.

Due to this action, a negative pressure is generated in the suction chamber and the air in the lift pipe is sucked up. The gas-liquid mixed water discharged into the discharge chamber is separated into air and water within the discharge chamber. The water from which the air has been separated returns to the suction chamber or the pump chamber, is mixed with air again by the rotation of the impeller, and is discharged to the discharge chamber as gas-liquid mixed water. A self-priming pumping system repeats this process to raise the water level in the pipe.

JP 2007-40155 A

In the pump device, if the gap between the impeller and the inner surface of the pump chamber is large, the amount of water that returns to the inlet side of the pump chamber without being discharged from the pump chamber to the discharge chamber, that is, the amount of water leakage increases. , the pump efficiency decreases. In order to reduce the amount of water leakage, it is conceivable to use a closed-type impeller, but with a closed-type impeller, it is difficult for the water returned from the discharge chamber to flow into the impeller, and it is difficult for the air inside the impeller to be discharged. Therefore, the self-priming efficiency decreases.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an impeller and a self-priming pump device that can prevent the self-priming efficiency and the pump efficiency from being lowered.

An impeller according to one aspect of the present invention includes: a first wall portion having a first through hole opening to a secondary side of a pump chamber; and a first wall portion forming the pump chamber between the first wall portion and the first wall portion. An impeller housed in the pump chamber of a self-priming pump device comprising two walls and rotated by a rotating shaft. The impeller is formed around the center of the first shroud on the surface of the first shroud on the first wall side, the first shroud having its center on the axis of the rotating shaft. a plurality of blades, provided at one end of the plurality of blades on the side of the first wall, configured in an annular shape coaxial with the rotating shaft, and forming a gap between the plurality of blades and the first wall; and a second shroud having an outer peripheral edge positioned closer to the center than the first through hole in a direction orthogonal to the axial direction of the rotating shaft , wherein the first shroud is located on the first shroud. The second shroud has a second through hole penetrating in the thickness direction, the second shroud is configured in a cylindrical shape, is arranged coaxially with the rotation shaft, and extends perpendicularly to the first wall in a direction orthogonal to the axial direction. and a mouth that forms a gap between the first wall and the plurality of blades and is configured in a shape that extends radially outward from the mouth, facing the first wall in the axial direction, A cover portion forming a gap between itself and the first wall portion is provided, and the cover portion faces a groove of the first wall portion that opens toward the second wall portion.

A self-priming pump device according to one aspect of the present invention includes: a first wall portion having a first through hole opening to a secondary side of a pump chamber; and the pump chamber between the first wall portion and the first wall portion. a pump casing including a second wall constituting a motor; a rotating shaft rotated by the motor; and an impeller housed in the pump chamber and rotated by the rotating shaft, the center of which is the rotating shaft a first shroud arranged on the axis of the first shroud, a plurality of blades formed around the center of the first shroud on the first wall side surface of the first shroud, and the plurality of Provided at one end of the blade on the side of the first wall, it is configured in an annular shape coaxial with the rotating shaft, forms a gap between itself and the first wall, and extends in the axial direction of the rotating shaft. an impeller having a second shroud having an outer peripheral edge positioned closer to the center than the first through hole in a direction perpendicular to the impeller, the first shroud penetrating through the first shroud in a thickness direction thereof; The second shroud is configured in a cylindrical shape, is arranged coaxially with the rotation axis, and is spaced from the first wall in a direction orthogonal to the axial direction. and a mouth that is provided on the plurality of blades and has a shape that extends radially outward from the mouth, faces the first wall portion in the axial direction, A cover portion forming a gap between itself and the wall portion is provided, and the cover portion faces the groove that opens to the second wall portion side of the first wall portion.

According to the present invention, it is possible to provide an impeller and a self-priming pump device that can prevent the self-priming efficiency and the pump efficiency from being lowered.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the structure of the pump apparatus which concerns on one Embodiment of this invention. The top view which shows the structure of the guide vane used for the same pump apparatus. Sectional drawing which shows the structure of the same guide vane. Sectional drawing which expands and shows the principal part of the same pump apparatus. The top view which shows the structure of the impeller used for the same pump apparatus. Sectional drawing which shows the structure of the same impeller. Sectional drawing which shows the principal part of the modification of the same pump apparatus.

A pump device 10 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. FIG. 1 is a cross-sectional view showing the pump device 10. As shown in FIG. FIG. 2 is a plan view showing the guide vanes 44 used in the pump device 10. FIG. FIG. 3 is a cross-sectional view of the guide vane 44 cut along the line F3-F3 shown in FIG. FIG. 4 is a cross-sectional view showing an enlarged main part of the pump device 10. As shown in FIG. FIG. 5 is a plan view showing the impeller 60 used in the pump device 10. FIG. FIG. 6 is a cross-sectional view showing a state in which the impeller 60 is cut.

The pump device 10 performs a water pumping operation in which the pressure of water sucked up from a pumping pipe connected to the primary side of the suction port 41 of the pump device 10 is increased and the water is discharged from the discharge port 42 . Further, the pump device 10 performs a self-priming operation when the flow path from the suction port 41 to the discharge port 42 is not filled with water after startup.

As shown in FIG. 1 , the pump device 10 includes a pump 20 that pressurizes and discharges water, a motor 90 that drives the pump 20 , and a base 100 that supports the pump 20 and the motor 90 .

The pump 20 includes a pump casing 30, an impeller 60 housed in the pump casing 30, a rotary shaft 70 fixed to the impeller 60 and rotated by a motor 90, and a seal between the pump casing 30 and the rotary shaft 70. and a shaft sealing device 80 .

The pump casing 30 has a casing 40 forming a suction chamber R1 and a cover member 50. As shown in FIG. Between the cover member 50 and the casing 40, a pump chamber R2 in which the impeller 60 is accommodated, and a discharge chamber R3.

Casing 40 is constructed from one or more members. In the present embodiment, the casing 40 includes a casing main body 43 which forms a suction chamber R1 therein and has a suction port 41 and a discharge port 42 formed therein, and a casing main body 43 which is a separate member. and a guide vane 44 forming a pump chamber R2 therebetween.

The casing main body 43 is made of, for example, a metal material or a resin material. The casing main body 43 has a tubular outer shell portion 43a and an inner wall portion 46 formed in the outer shell portion 43a.

The outer shell portion 43a is configured in a cylindrical shape having an opening 43b at one end on the motor 90 side and a suction port 41 at the other end. A check valve 45 is provided in the suction port 41 . The check valve 45 allows water to flow from the suction port 41 to the suction chamber R<b>1 and regulates water flow from the suction chamber R<b>1 to the suction port 41 . Further, the suction port 41 is provided with, for example, a tubular connecting portion to which a pumping pipe is connected. A discharge port 42 is formed in the outer peripheral portion of the outer shell portion 43a. Further, the outer shell portion 43a is provided with a cylindrical portion 42a that constitutes a part of the flow path on the secondary side of the discharge port 42. As shown in FIG. The cylindrical portion is provided with a flange for connecting a water pipe for feeding water to a water destination.

The inner wall portion 46 forms a suction chamber R<b>1 communicating with the suction port 41 in the casing body 43 . In this embodiment, the inner wall portion 46 is configured in a tubular shape as an example. An opening 46a at one end of the inner wall portion 46 on the side of the cover member 50 is formed, for example, in a circular shape.

The guide vanes 44 are fixed to the inner wall portion 46 . The guide vanes 44 are made of resin material, for example. The guide vane 44 includes a cylindrical fixing portion 47 fixed to an opening 46a of the inner wall portion 46 on the pump chamber R2 side, and a base portion 48 extending radially outward of the fixing portion 47 from one axial end of the fixing portion 47. , and a plurality of guide vanes 49 formed on one main surface of the base portion 48 .

As shown in FIGS. 2 to 4, the fixing portion 47 includes a cylindrical portion 47a fitted in the opening 46a of the inner wall portion 46, an annular groove portion 47b formed radially outwardly of the cylindrical portion 47a, and an O-ring 47c provided in the groove portion 47b.

The cylindrical portion 47a is fixed in the opening 46a by, for example, press fitting. The cylindrical portion 47a is arranged so that the axis of the cylindrical portion 47a is coaxial with, for example, the opening 46a. The groove portion 47 b faces the inner wall portion 46 while the guide vane 44 is fixed inside the casing body 43 . The O-ring 47c is in close contact with the fixing portion 47 and the inner wall portion 46 to seal the space between the fixing portion 47 and the inner wall portion 46. As shown in FIG. The O-ring 47c specifically adheres to the edge of the opening 46a.

The thickness between the end surface 47e of the fixing portion 47 facing the pump chamber R2 in the state where the guide vane 44 is fixed in the casing body 43 and the bottom surface 47b1 of the groove portion 47b is such that the strength of the fixing portion 47 is sufficient. It has a thickness of The end face 47e is formed in a shape having a plurality of intermittent grooves 47g on a circle concentric with the cylindrical portion 47a. The thick portion forming the end face 47e forms a reinforcing portion 47f. The inner diameter of the reinforcing portion 47f is larger than the inner diameter of the cylindrical portion 47a as an example in this embodiment.

The base portion 48 is fixed to the casing main body 43 and has a ring-shaped first portion 48a facing the later-described blades 62 of the impeller 60 in the axial direction of the cylindrical portion 47a. and an outwardly configured second portion 48b.

A plurality of first through holes 48a2 are formed in the first portion 48a. The plurality of first through holes 48a2 respectively penetrate the first portion 48a, for example, in the thickness direction of the first portion 48a. That is, the plurality of first through holes 48a2 open to the discharge chamber R3 and the pump chamber R2, respectively.

The plurality of first through-holes 48a2 are formed to allow water from the discharge chamber R3 to flow to the pump chamber R2. The plurality of first through holes 48a2 are, for example, arranged at equal intervals on a circle concentric with the cylindrical portion 47a. The surface 48 a 1 of the first portion 48 a configured in this way is located closer to the pump chamber R 2 than the end surface 47 e of the fixing portion 47 when the guide vane 44 is fixed to the casing main body 43 .

A surface 48b1 of the second portion 48b on the pump chamber R2 side is located closer to the suction chamber R1 in the axial direction of the cylindrical portion 47a than the surface 48a1 of the first portion 48a. The surface 48b1 is configured as a plane substantially orthogonal to the axial direction of the cylindrical portion 47a. A plurality of guide vanes 49 are formed on the surface 48b1. The plurality of guide vanes 49 protrude toward the cover member 50 from the surface 48b1. A plurality of guide vanes 49 guide the water flowing out from the impeller 60 to the discharge chamber R3.

The cover member 50 is made of metal, for example. As shown in FIG. 1, the cover member 50 is formed with a hole 51 for arranging a part of the rotating shaft 70, and is an accommodation chamber constituting portion forming an accommodation chamber 52 for accommodating the shaft sealing device 80 between the cover member 50 and the impeller 60. 53 , and a plate-shaped cover body 54 extending from the storage chamber forming portion 53 in a direction perpendicular to the axial direction of the hole 51 .

The accommodation chamber forming portion 53 is formed in a shape in which the material forming the cover member 50 protrudes toward the motor 90 while maintaining a substantially constant thickness. The cover main body 54 and the casing main body 43 form a discharge chamber R3. A seal member 55 is provided between the cover body 54 and the edge of the opening 43 b of the casing body 43 . The sealing member 55 seals between the cover main body 54 and the casing main body 43 . The sealing member 55 is, for example, an O-ring.

One main surface 54 a of the cover main body 54 faces the impeller 60 and the guide vanes 49 of the guide vanes 44 when the cover member 50 is fixed to the casing main body 43 . Between the surface 54a and the impeller 60 and between the surface 54a and the guide vanes 49, gaps S through which water can flow are formed. The surface 54a has a first surface portion 54a1 and a second surface portion 54a2.

The first surface portion 54 a 1 is continuous with the accommodation chamber forming portion 53 . The first surface portion 54 a 1 is configured in an annular shape coaxially with the hole 51 . The first surface portion 54 a 1 faces a first shroud 61 of the impeller 60 , which will be described later, while the cover member 50 is fixed to the casing body 43 .

The second surface portion 54a2 is positioned radially outwardly of the first surface portion 54a1 and has an annular shape that is continuous with the first surface portion 54a1. The second surface portion 54 a 2 faces part of the first shroud 61 and the guide vane 49 of the guide vane 44 in a state where the cover member 50 is fixed to the casing body 43 . The gap between the second surface portion 54a2 and the first shroud 61 is smaller than the gap between the first surface portion 54a1 and the first shroud 61 .

As shown in FIGS. 5 and 6, the impeller 60 is arranged within the pump chamber R2. The impeller 60 faces the accommodation chamber forming portion 53 of the cover member 50 and part of the cover main body 54 . The impeller 60 includes a first shroud 61 arranged on the cover member 50 side, a plurality of blades 62 formed on the surface of the first shroud 61 on the suction chamber R1 side, and guide vanes 44 provided on the blades 62. and a second shroud 63 facing each other.

The first shroud 61 includes a tubular portion 64 to which the rotating shaft 70 is fixed, and a base portion 65 extending outward from the outer peripheral surface of the tubular portion 64 in a direction perpendicular to the axial direction of the tubular portion 64 . have.

The cylindrical portion 64 is fixed to the rotating shaft 70 in the circumferential direction and the axial direction of the rotating shaft 70 . When the cylindrical portion 64 is fixed to the rotating shaft 70, the opening 46a, the impeller 60, the guide vanes 44, and the rotating shaft 70 are coaxially arranged. That is, the center of the first shroud 61 is positioned on the axis of the rotating shaft 70 .

An inner peripheral surface 64a of the cylindrical portion 64 is configured in a shape that accommodates the end of the rotating shaft 70 and the key 71 provided at the end. The impeller 60 is rotated integrally with the rotating shaft 70 by engaging a portion of the inner peripheral surface 64 a of the cylindrical portion 64 with the key 71 in the circumferential direction of the rotating shaft 70 . A key 71 fixes the cylindrical portion 64 to the rotating shaft 70 in the circumferential direction.

The base portion 65 has a curved portion 65a radially extending from the cylindrical portion 64 to a predetermined position, and a flat plate portion 65b formed outside the curved portion 65a.

The curved portion 65a has a substantially uniform thickness, and is configured such that the surface on the cover member 50 side and the surface on the suction chamber R1 side are curved surfaces.

The flat plate portion 65b extends radially outward from the curved portion 65a. The flat plate portion 65b has a substantially uniform thickness, and the surface on the side of the cover member 50 and the surface on the side of the suction chamber R1 are configured to be flat surfaces orthogonal to the axial direction of the tubular portion 64. As shown in FIG.

A plurality of second through holes 66 are formed in the flat plate portion 65b. The plurality of second through holes 66 penetrate the flat plate portion 65b in the thickness direction of the flat plate portion 65b. That is, the plurality of second through holes 66 communicate the pump chamber R<b>2 and the space between the impeller 60 and the cover member 50 . The plurality of second through-holes 66 are arranged at equal intervals, for example, on a circumference concentric with the cylindrical portion 64 .

A plurality of blades 62, for example, five blades in this embodiment, are provided at equal intervals in the circumferential direction of the flat plate portion 65b. The plurality of blades 62 extend from the inner peripheral edge to the outer peripheral edge of the flat plate portion 65b. The plurality of blades 62 are configured to have curved surfaces with a predetermined curvature.

The plurality of blades 62 have gaps A between them and the surface 48a1. The gap A is formed as a gap that increases flow resistance and makes it difficult for water to flow. The distance from the surface 48a1 to the tip of the blade 62 in the axial direction of the rotating shaft 70 is set to the distance A1. The distance A1 is set as short as possible.

As shown in FIGS. 1 and 5, the second shroud 63 has an annular configuration, and is fixed to the ends of the plurality of blades 62 on the suction chamber R1 side in the axial direction of the cylindrical portion 64, for example, by welding. It is The second shroud 63 includes a cylindrical mouth 67 arranged inside the fixing portion 47 of the guide vane 44, a cover portion 68 extending radially outward of the mouth 67 from one end of the outer peripheral surface of the mouth 67, have.

The mouse 67 is arranged coaxially with the tubular portion 64 . Furthermore, the mouse 67 is arranged coaxially with the rotation axis 70 . The mouth 67 has a cylindrical shape with an outer diameter smaller than the inner diameter of the reinforcing portion 47f of the fixed portion 47. As shown in FIG. An outer peripheral surface 67 a of the mouse 67 is arranged inside the fixed portion 47 . The mouth 67 is arranged inside the reinforcing portion 47f in this embodiment. The mouth 67 forms a clearance C between the mouth 67 and the guide vane 44 in the radial direction of the mouth 67 . In this embodiment, the mouth 67 forms a gap C with the inner peripheral surface 47f1 of the reinforcing portion 47f. The gap C has a large flow resistance and is configured as a gap through which water does not easily flow. A difference C1 between the radius of the inner diameter of the reinforcing portion 47f and the radius of the outer diameter of the mouth 67 is set to be as small as possible. The difference C1 is the distance from the inner peripheral surface 47f1 of the reinforcing portion 47f to the outer peripheral surface 67a of the mouth 67 in the radial direction.

The cover portion 68 is arranged coaxially with the mouse 67 . An outer peripheral edge 68 a of the cover portion 68 is formed in a circular shape concentric with the mouse 67 . That is, the cover portion 68 is configured in an annular shape coaxial with the rotating shaft 70 . Note that the outer peripheral edge 68a is the outermost portion of the cover portion 68 in the radial direction.

The outer peripheral edge 68 a of the cover portion 68 is positioned closer to the axis of the mouth 67 than the first through hole 48 a 2 of the guide vane 44 , that is, closer to the center of the first shroud 61 in the radial direction of the mouth 67 . Further, in other words, the outer peripheral edge 68a of the cover portion 68 is positioned closer to the axis of the rotating shaft 70 than the first through hole 48a2 in the axial direction of the rotating shaft 70 of the guide vane 44 . The axis of the rotating shaft 70 is the rotation center L of the impeller 60 .

A surface 68 b of the cover portion 68 on the guide vane 44 side in the axial direction of the rotating shaft 70 faces the end surface 47 e of the reinforcing portion 47 f of the guide vane 44 in the axial direction of the rotating shaft 70 . The surface 68b forms a gap B with the end surface 47e. The gap B is configured as a gap through which flow resistance is large and water is difficult to flow. The distance from the surface 68b to the end surface 47e in the axial direction of the rotating shaft 70 is the distance B1. The distance B1 is set as short as possible.

Distances A1, B1, and C1 are set to one of the following combinations. In combination 1, the distances A1, B1 and C1 are equal. In combination 2, A1<B1 and A1=C1. In combination 3, A1<B1 and A1>C1.

The end portion 72 of the rotating shaft 70 is accommodated within the cylindrical portion 64 as shown in FIG. The end portion 72 is fixed to the impeller 60 in the axial direction of the rotating shaft 70 with a fixing member 73 such as a bolt. The rotating shaft 70 is circumferentially fixed to the impeller 60 by a key 71 . The rotating shaft 70 is arranged coaxially with the tubular portion 64 . The fixing member 73 is provided with a cap 73a for reducing flow resistance of water.

The shaft sealing device 80 is, for example, a mechanical seal provided on the rotating shaft 70, the cover member 50, and the impeller 60. As shown in FIG. The shaft sealing device 80 seals between the cover member 50 and the rotating shaft 70 .

The motor 90 has a motor casing 91 , a stator provided within the motor casing 91 , and a rotor disposed within the motor casing 91 and fixed directly or indirectly to the rotating shaft 70 . As the rotor rotates, the rotating shaft 70 and the impeller 60 rotate together.

Next, operation of the pump device 10 will be described. The pump device 10 performs pumping operation or self-priming operation. If the impeller 60 is not immersed in water during self-priming operation, water for self-priming operation is injected into the suction chamber R1 and the pump chamber R2 from a separately provided tank, and the impeller 60 is immersed in water. state.

By rotating the impeller 60 in this state, self-priming operation is performed. In the self-priming operation, rotation of the impeller 60 forms gas-liquid mixed water in which the air in the pump casing 30 is mixed with water. The gas-liquid mixed water is sent to the discharge chamber R3.

By discharging the gas-liquid mixed water into the discharge chamber R3, a negative pressure is generated in the suction chamber R1, and the air in the pumping pipe connected to the suction port 41 is sucked up. The gas-liquid mixed water sent to the discharge chamber R3 is separated into air and water within the discharge chamber R3. The separated air is discharged from the discharge port 42 located above the discharge chamber R3. Since water pressure-increased by the impeller 60 is discharged into the discharge chamber R3, the pressure of the water is higher than that of the water in the pump chamber R2.

A portion of the water discharged into the discharge chamber R3 and having a pressure higher than the pressure in the pump chamber R2 returns to the pump chamber R2 through the first through holes 48a2 of the base portion 48 of the guide vane 44 due to the pressure difference. Another part of the water in the discharge chamber R3 flows through the gap S between the impeller 60 and the cover member 50. As shown in FIG. The water between the impeller 60 and the cover member 50 is higher than the pressure near the second through hole 66 in the impeller 60 . Part of the water flowing through the gap S returns into the impeller 60 through the second through hole 66 due to the pressure difference.

By passing through the second through hole 66 in this manner, the water separated from the air returns to the pump chamber R2. Further, air is separated from water located near the through holes 48a2, 66 in the pump chamber R2 by the water flowing through the through holes 48a2, 66.

In the pump device 10 configured as described above, the outer peripheral edge 68a of the cover portion 68 of the second shroud 63 is closer to the rotation center of the impeller 60 than the first through holes 48a2 of the guide vanes 44, that is, the first shroud. It is located on the center side of 61. Therefore, the water returned to the pump chamber R2 flows into the impeller 60 through the first through-hole 48a2, thereby preventing the self-suction efficiency from deteriorating.

Furthermore, the second shroud 63 configures the gap between the impeller 60 and the guide vane 44 as a gap in which the flow resistance of water is large and water is difficult to flow. For this reason, water is less likely to leak from the pump chamber R2 to the suction chamber R1, so that the pump efficiency of the pump device 10 is prevented from deteriorating.

Thus, the pump device 10 can prevent the self-priming efficiency and the pump efficiency from deteriorating.
Furthermore, since water flows into the impeller 60 through the second through holes 66 of the first shroud 61, the self-priming efficiency can be improved.

Further, since the second shroud 63 has a mouth 67 , the gap between the impeller 60 and the guide vanes 44 includes a gap C extending in the axial direction of the rotating shaft 70 . The gap C along the axial direction is easier to manage than the gaps A and B in the direction intersecting with the axial direction, that is, in the present embodiment, the direction substantially perpendicular to the axial direction. Therefore, the gap C can be made as small as possible, so that it is possible to further prevent water from leaking into the suction chamber R1 through the gap between the impeller 60 and the guide vanes 44 .

Further, the gap between the second shroud 63 and the guide vane 44 is composed of gaps A, B and C. The gap B is a gap along the direction crossing the axial direction of the rotating shaft 70 , and the gap C is a gap along the axial direction of the rotating shaft 70 . Therefore, the gap between the second shroud 63 and the guide vane 44 is curved between the gap B and the gap C. As shown in FIG. Therefore, the flow resistance in the gap between the second shroud 63 and the guide vane 44 increases.

Furthermore, in this embodiment, since the gap B is a gap along the direction orthogonal to the axial direction of the rotating shaft 70, the flow resistance in the gap between the second shroud 63 and the guide vanes 44 is further increased. growing.

Furthermore, by arranging the cover portion 68 of the second shroud 63 to face the reinforcing portion 47f of the guide vane 44, the gap between the end surface 47e of the reinforcing portion 47f and the impeller 60 can be minimized. Therefore, even if the groove 47g is formed in the end surface 47e of the reinforcing portion 47f, the flow path resistance of the gap between the end surface 47e and the cover portion 68 can be increased.

Furthermore, the second shroud 63 allows the end face 47e of the reinforcing portion 47f to be formed into a shape having the groove 47g, so that the reinforcing portion 47f can be prevented from sinking when the guide vane 44 is manufactured. That is, the moldability of the guide vanes 44 can be improved.

Furthermore, since the end face 47e of the reinforcing portion 47f can be formed into a shape having the groove 47g, the guide vane 44 can be formed with less material. Therefore, the manufacturing cost of the guide vanes 44 can be reduced.

Furthermore, the gaps between the guide vanes 44 and the cover portion 68 of the second shroud 63 are the gaps between the outer peripheral surface of the cover portion 68 and the guide vanes 44 and the gaps between the surface 68 b of the cover portion 68 and the guide vanes 44 . including gaps between A gap between the outer peripheral surface of the cover portion 68 and the guide vane 44 is a gap along the axial direction of the rotating shaft 70 . Therefore, the gap between the guide vane 44 and the cover portion 68 includes a gap along the axial direction of the rotating shaft 70 and a gap in a direction orthogonal to the axial direction of the rotating shaft 70, so that the flow resistance is reduced. growing. Furthermore, since loss increases due to an increase in flow path resistance, a labyrinth effect can also be produced.

Furthermore, by setting the distances A1, B1, and C1 from the guide vanes 44 to the impeller 60 in the gaps A, B, and C to any one of combination 1, combination 2, and combination 3, the suction chamber R1 side Since the radius difference C1, which is the distance from the guide vane 44 to the impeller 60 at the gap C, can be minimized, water leakage from the pump chamber R2 to the suction chamber R1 can be further prevented.

In the present embodiment, the first through holes 48a2 of the guide vanes 44 are formed in the first portions 48a of the guide vanes 44 as an example, but are not limited to this. The position of the first through hole 48a2 can be appropriately determined according to the configuration of the pump device 10, such as the guide vane 44 and the impeller 60. Furthermore, the second through hole 66 is formed in the flat plate portion 65b of the first shroud 61, but is not limited to this. The position of the second through hole 66 can be appropriately determined according to the configuration of the pump device 10 such as the impeller 60 and the cover member 50 . Furthermore, the second through hole 66 may be omitted.

In this embodiment, the mouth 67 of the impeller 60 is configured as a cylindrical portion having an outer diameter smaller than the inner diameter of the portion of the fixed portion 47 of the guide vane 44 facing the mouth 67 in the radial direction. A gap C between 67 and the casing 40 regulates leakage of water from the discharge chamber R3 to the suction chamber R1 side. However, the gap C is not limited to regulating water leakage. In another example, a liner ring 110 that prevents water leakage may be provided between the fixed portion 47 and the mouth 67 as in the modification shown in FIG. Specifically, the liner ring 110 is fixed inside the inner peripheral surface 47f1 of the reinforcing portion 47f. The mouth 67 has a slight gap between it and the inner peripheral surface of the liner ring 110 that allows the impeller 60 to rotate.

Further, in this embodiment, the guide vane 44 is provided as an example of the wall portion forming the pump chamber R2 between the cover member 50 and the cover member 50 . However, the wall portion forming pump chamber R<b>2 with cover member 50 is not limited to guide vane 44 . The wall portion forming the pump chamber R<b>2 between itself and the cover member 50 may be configured without the guide vanes 49 . Moreover, the wall portion forming the pump chamber R2 between itself and the cover member 50 is not limited to being a separate member from the casing main body 43 . This wall portion may be formed integrally with the casing body 43 .

Also, in this embodiment, the second shroud 63 has a mouth 67 and a cover portion 68 . However, the second shroud 63 may be configured without the mouth 67 . Even in a configuration without the mouth 67, water leakage can be prevented by minimizing the gap B and increasing the flow resistance. In this configuration, the distances A1 and B1 are set to one of the following two combinations. Combination 1 has the same distance A1 and distance B1. In combination 2, distance B1 is longer than distance A1.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the scope of the invention. Further, each embodiment may be implemented in combination as appropriate, in which case the combined effect can be obtained. Furthermore, various inventions are included in the above embodiments, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiments, if the problem can be solved and effects can be obtained, the configuration with the constituent elements deleted can be extracted as an invention.
Description equivalent to the invention described in the scope of claims at the time of filing of the present application will be added below.
[1]
A self-priming type including a first wall portion having a first through hole opening to the secondary side of a pump chamber, and a second wall portion forming the pump chamber between the first wall portion and the first wall portion. An impeller housed in the pump chamber of the pump device and rotated by a rotating shaft,
a first shroud centered on the axis of the axis of rotation;
a plurality of blades formed around the center of the first shroud on the first wall side surface of the first shroud;
Provided at one end of the plurality of blades on the side of the first wall, is configured in an annular shape coaxial with the rotating shaft, forms a gap between itself and the first wall, and forms a gap with the rotating shaft. a second shroud having an outer peripheral edge positioned closer to the center than the first through hole in a direction orthogonal to the axial direction;
impeller with
[2]
The impeller according to [1], wherein the first shroud has a second through hole penetrating in the thickness direction of the first shroud.
[3]
The second shroud is
a mouse configured in a cylindrical shape, arranged coaxially with the rotation shaft, and forming a gap with the first wall in a direction orthogonal to the axial direction;
The blades are provided on the plurality of blades and configured to extend radially outward from the mouth, face the first wall portion in the axial direction, and form a gap between the blades and the first wall portion. and the impeller according to [2].
[4]
The impeller according to [3], wherein the cover portion faces a groove of the first wall portion that opens toward the second wall portion.
[5]
a pump casing including a first wall portion having a first through hole opening to a secondary side of a pump chamber, and a second wall portion forming the pump chamber between the first wall portion and the first wall portion; ,
a motor;
a rotating shaft rotated by the motor;
An impeller housed in the pump chamber and rotated by the rotating shaft, the first shroud centered on the axis of the rotating shaft, the first wall side of the first shroud A plurality of blades formed around the center of the first shroud, and one end of the plurality of blades on the side of the first wall portion on the surface of , and configured in an annular shape coaxial with the rotating shaft and a second shroud forming a gap between itself and the first wall, and having an outer peripheral edge located closer to the center than the first through hole in a direction orthogonal to the rotation axis; ,
A self-priming pump device comprising:
[6]
The self-priming pump device according to [5], wherein the first shroud has a second through hole extending through the first shroud in a thickness direction.
[7]
The second shroud is
A mouse configured in a cylindrical shape and arranged coaxially with the rotating shaft and forming a gap between itself and the first wall in a direction orthogonal to the axial direction of the rotating shaft; a cover portion formed in a shape extending radially outward from the mouth, facing the first wall portion in the axial direction, and forming a gap between the cover portion and the first wall portion; The self-priming pump device according to [5].
[8]
The pump casing has an inner wall portion forming a suction chamber located on the primary side of the pump chamber,
A seal member is provided between the first wall portion and the inner wall portion,
A surface of the first wall facing the sealing member in the axial direction of the rotating shaft is configured to have a groove,
The self-priming pump apparatus according to [5], wherein the second shroud faces the groove in the axial direction.
[9]
a liner ring provided on the first wall;
The second shroud has a cylindrical mouth arranged coaxially with the rotation axis in the liner ring, and a shape provided on the plurality of blades and extending radially outward from the mouth. The self-priming pump device according to [5], further comprising: a cover portion forming a gap between itself and the first wall portion in the axial direction of the rotating shaft.
[10]
A first distance axially of the axis of rotation from the first wall to the plurality of vanes is equal to a second distance axially from the first wall to the second shroud The self-priming pump device according to [5].
[11]
A first distance from the first wall to the plurality of vanes in the axial direction of the axis of rotation is shorter than a second distance from the first wall to the second shroud in the axial direction. The self-priming pump device according to [5].
[12]
a first distance from the first wall to the plurality of blades in the axial direction of the rotating shaft; a second distance from the first wall to the cover in the axial direction; The self-priming pump device of [7], wherein the third distance from the first wall to the mouth in a direction perpendicular to the direction is equal.
[13]
a first distance from the first wall to the plurality of blades in the axial direction of the rotating shaft is shorter than a second distance from the first wall to the cover in the axial direction; The self-priming pump device according to [7], which is equal to a third distance from the first wall to the mouth in a direction orthogonal to the axial direction.
[14]
a first distance from the first wall to the plurality of blades in the axial direction of the rotating shaft is shorter than a second distance from the first wall to the cover in the axial direction; The self-priming pump device according to [7], which is longer than a third distance from the mouth to the first wall in a direction orthogonal to the axial direction.

DESCRIPTION OF SYMBOLS 10... Pump apparatus, 20... Pump, 30... Pump casing, 40... Casing, 41... Suction port, 42... Discharge port, 43... Casing main body, 43a... Outer shell part, 43b... Opening, 44... Guide vane, 46... Inner wall Part 47c O-ring 47e End face 47f Reinforcing part 48 Base 48a First part 48a1 Surface 48a2 First through hole 48b Second part 48b1 Surface 49... Guide vane 50... Cover member 60... Impeller 61... First shroud 62... Blade 63... Second shroud 64... Cylindrical part 65... Base part 65a... Curved part 65b... Flat plate Part 66 Second through hole 67 Mouth 68 Cover 70 Rotating shaft 80 Shaft sealing device 90 Motor 110 Liner ring A Gap A1 Distance B Gap , B1 -- Distance, C -- Gap, C1 -- Radius difference, R1 -- Suction chamber, R2 -- Pump chamber, R3 -- Discharge chamber.

Claims (9)

A self-priming type including a first wall portion having a first through hole opening to the secondary side of a pump chamber, and a second wall portion forming the pump chamber between the first wall portion and the first wall portion. An impeller housed in the pump chamber of the pump device and rotated by a rotating shaft,
a first shroud centered on the axis of the axis of rotation;
a plurality of blades formed around the center of the first shroud on the first wall side surface of the first shroud;
Provided at one end of the plurality of blades on the side of the first wall, is configured in an annular shape coaxial with the rotating shaft, forms a gap between itself and the first wall, and forms a gap with the rotating shaft. a second shroud having an outer peripheral edge positioned closer to the center than the first through hole in a direction orthogonal to the axial direction;
with
The first shroud has a second through hole penetrating in the thickness direction of the first shroud,
the second shroud is configured in a cylindrical shape, is arranged coaxially with the rotation shaft, and forms a gap between the second shroud and the first wall in a direction orthogonal to the axial direction; It is provided on a plurality of blades and configured in a shape extending radially outward from the mouth, faces the first wall in the axial direction, and forms a gap between the blade and the first wall. Equipped with a cover,
The impeller, wherein the cover portion faces a groove of the first wall portion that opens toward the second wall portion. a pump casing including a first wall portion having a first through hole opening to a secondary side of a pump chamber, and a second wall portion forming the pump chamber between the first wall portion and the first wall portion; ,
a motor;
a rotating shaft rotated by the motor;
An impeller housed in the pump chamber and rotated by the rotating shaft, the first shroud having its center aligned with the axis of the rotating shaft, and the surface of the first shroud facing the first wall. 2, a plurality of blades formed around the center of the first shroud, and provided at one end of the plurality of blades on the first wall side, and configured in an annular shape coaxial with the rotating shaft, An impeller comprising a second shroud forming a gap between itself and the first wall, and having an outer peripheral edge located closer to the center than the first through hole in a direction orthogonal to the axial direction of the rotating shaft. and
The first shroud has a second through hole penetrating in the thickness direction of the first shroud,
the second shroud is configured in a cylindrical shape, is arranged coaxially with the rotation shaft, and forms a gap between the second shroud and the first wall in a direction orthogonal to the axial direction; It is provided on a plurality of blades and configured in a shape extending radially outward from the mouth, faces the first wall in the axial direction, and forms a gap between the blade and the first wall. Equipped with a cover,
The cover portion faces a groove that opens toward the second wall portion of the first wall portion,
Self-priming pump device. The pump casing has an inner wall portion forming a suction chamber located on the primary side of the pump chamber,
A seal member is provided between the first wall portion and the inner wall portion,
A surface of the first wall facing the sealing member in the axial direction of the rotating shaft is configured to have a groove,
3. The self-priming pump apparatus of claim 2 , wherein said second shroud faces said groove in said axial direction. a liner ring provided on the first wall;
The second shroud has a cylindrical mouth arranged coaxially with the rotation axis in the liner ring, and a shape provided on the plurality of blades and extending radially outward from the mouth. 3. The self-priming pump device according to claim 2 , further comprising a cover portion that forms a gap between itself and the first wall portion in the axial direction of the rotating shaft. a pump casing including a first wall portion having a first through hole opening to a secondary side of a pump chamber, and a second wall portion forming the pump chamber between the first wall portion and the first wall portion; ,
a motor;
a rotating shaft rotated by the motor;
An impeller housed in the pump chamber and rotated by the rotating shaft, the first shroud centered on the axis of the rotating shaft, the first wall side of the first shroud A plurality of blades formed around the center of the first shroud, and one end of the plurality of blades on the side of the first wall portion on the surface of , and configured in an annular shape coaxial with the rotating shaft and a second shroud forming a gap between itself and the first wall, and having an outer peripheral edge located closer to the center than the first through hole in a direction orthogonal to the rotation axis; , and
A first distance axially of the axis of rotation from the first wall to the plurality of vanes is equal to a second distance axially from the first wall to the second shroud , self-priming pumping device. a pump casing including a first wall portion having a first through hole opening to a secondary side of a pump chamber, and a second wall portion forming the pump chamber between the first wall portion and the first wall portion; ,
a motor;
a rotating shaft rotated by the motor;
An impeller housed in the pump chamber and rotated by the rotating shaft, the first shroud centered on the axis of the rotating shaft, the first wall side of the first shroud A plurality of blades formed around the center of the first shroud, and one end of the plurality of blades on the side of the first wall portion on the surface of , and configured in an annular shape coaxial with the rotating shaft and a second shroud forming a gap between itself and the first wall, and having an outer peripheral edge located closer to the center than the first through hole in a direction orthogonal to the rotation axis; , and
A first distance from the first wall to the plurality of vanes in the axial direction of the axis of rotation is shorter than a second distance from the first wall to the second shroud in the axial direction. , self-priming pumping device. a pump casing including a first wall portion having a first through hole opening to a secondary side of a pump chamber, and a second wall portion forming the pump chamber between the first wall portion and the first wall portion; ,
a motor;
a rotating shaft rotated by the motor;
An impeller housed in the pump chamber and rotated by the rotating shaft, the first shroud centered on the axis of the rotating shaft, the first wall side of the first shroud A plurality of blades formed around the center of the first shroud, and one end of the plurality of blades on the side of the first wall portion on the surface of , and configured in an annular shape coaxial with the rotating shaft and a second shroud forming a gap between itself and the first wall, and having an outer peripheral edge located closer to the center than the first through hole in a direction orthogonal to the rotation axis; , and
the second shroud has a cylindrical shape, is arranged coaxially with the rotation shaft, and forms a gap between the second shroud and the first wall in a direction orthogonal to the axial direction of the rotation shaft; and is provided on the plurality of blades and configured to extend radially outward from the mouth, faces the first wall portion in the axial direction, and has a gap between the blade and the first wall portion. Equipped with a cover portion that constitutes,
a first distance from the first wall to the plurality of blades in the axial direction of the rotating shaft; a second distance from the first wall to the cover in the axial direction; A self-priming pumping device, wherein a third distance from said first wall to said mouth in a direction orthogonal to a direction is equal. a pump casing including a first wall portion having a first through hole opening to a secondary side of a pump chamber, and a second wall portion forming the pump chamber between the first wall portion and the first wall portion; ,
a motor;
a rotating shaft rotated by the motor;
An impeller housed in the pump chamber and rotated by the rotating shaft, the first shroud centered on the axis of the rotating shaft, the first wall side of the first shroud A plurality of blades formed around the center of the first shroud, and one end of the plurality of blades on the side of the first wall portion on the surface of , and configured in an annular shape coaxial with the rotating shaft and a second shroud forming a gap between itself and the first wall, and having an outer peripheral edge located closer to the center than the first through hole in a direction orthogonal to the rotation axis; , and
the second shroud has a cylindrical shape, is arranged coaxially with the rotation shaft, and forms a gap between the second shroud and the first wall in a direction orthogonal to the axial direction of the rotation shaft; and is provided on the plurality of blades and configured to extend radially outward from the mouth, faces the first wall portion in the axial direction, and has a gap between the blade and the first wall portion. Equipped with a cover portion that constitutes,
a first distance from the first wall to the plurality of blades in the axial direction of the rotating shaft is shorter than a second distance from the first wall to the cover in the axial direction; and equal to a third distance from the first wall to the mouth in a direction orthogonal to the axial direction. a pump casing including a first wall portion having a first through hole opening to a secondary side of a pump chamber, and a second wall portion forming the pump chamber between the first wall portion and the first wall portion; ,
a motor;
a rotating shaft rotated by the motor;
An impeller housed in the pump chamber and rotated by the rotating shaft, the first shroud centered on the axis of the rotating shaft, the first wall side of the first shroud A plurality of blades formed around the center of the first shroud, and one end of the plurality of blades on the side of the first wall portion on the surface of , and configured in an annular shape coaxial with the rotating shaft and a second shroud forming a gap between itself and the first wall, and having an outer peripheral edge located closer to the center than the first through hole in a direction orthogonal to the rotation axis; , and
the second shroud has a cylindrical shape, is arranged coaxially with the rotation shaft, and forms a gap between the second shroud and the first wall in a direction orthogonal to the axial direction of the rotation shaft; and is provided on the plurality of blades and configured to extend radially outward from the mouth, faces the first wall portion in the axial direction, and has a gap between the blade and the first wall portion. Equipped with a cover portion that constitutes,
a first distance from the first wall to the plurality of blades in the axial direction of the rotating shaft is shorter than a second distance from the first wall to the cover in the axial direction; and longer than a third distance from the mouth to the first wall in a direction orthogonal to the axial direction.

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