JP2002266783A - Impeller for pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impeller for a pump further increasing boosting by suppressing a parasitic vortex of a fluid in the impeller and strengthening a vortex. SOLUTION: This impeller 42 for the pump constituted by forming a vane part in its circumferential edge part is rotatably provided in a casing formed of a first casing 22 and a second casing 32. One channel 24 and the other cannel 34 having an inlet 23 and an outlet 33 in respective positions facing to the both casings 22 and 32 and the vane part 45 are circumferentially provided. This impeller is also provided with, at least, a single arch 47 communicating the vane part 45 from one channel to the other channel via the impeller 42 so as to allow the fluid 71 to flow out/in, erected over a vane groove 46, or a clearance of the adjoining vanes parts 45, formed of a pressure face 45a of the vane part 45 in the rotating direction side of the impeller 42 and a negative pressure surface 45b in the rear side of the pressure surface 45.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a casing,
An impeller in which a blade portion is formed on the peripheral portion is rotatably provided, and a flow path is provided in a circular shape at positions on both sides facing the blade portion of the casing, and a vortex is generated by the rotation of the impeller to increase the pressure. The present invention relates to a pump impeller in which the blade portion is communicated from one side of the flow path to the other side so that fluid can flow in and out.

[0002]

2. Description of the Related Art Conventionally, there is disclosed one shown in FIGS. 8 (a) and 8 (b).

That is, as shown in FIGS. 8 (a) and 8 (b), a blade 4 has a V-shaped pressure surface 5 and a negative pressure surface 6 in a rotational direction, and a blade 4a of the blade 4a. Root 4b
Are formed with a chevron-shaped projection 7a.
The fluid flowing into the blade groove 7, which is the gap of a, is swirled in the flow paths 2A, 2B by centrifugal force to generate a vortex 10 between the blade part 4 provided with the protrusion 7a and the flow paths 2A, 2B. A pump impeller 3 is disclosed in which the pressure is increased to flow out of an outlet (not shown) of a casing 2B.

[0004]

However, in the conventional pump impeller 3, the opening between the ring 8 and the projection 7a is large, and the vortex 10 is applied between the vortices 10 on both sides of the upper part of the projection 7a. The force is weakened, and a parasitic vortex 11 is generated. On the contrary, there is a problem that the parasitic vortex 11 weakens the adjacent vortex 10 and inhibits the pressure increase.

Therefore, the present invention suppresses the generation of the parasitic vortex of the fluid in the impeller, strengthens the vortex, and further increases the pressure.
It is intended to provide an impeller for a pump.

[0006]

According to a first aspect of the present invention, there is provided a casing comprising a first casing and a second casing, wherein a blade portion is formed on a peripheral portion of the casing. The first casing and the second casing are provided at one position facing the blade portion, and one flow path having an inlet or an outlet and the other flow path are provided, A pump impeller that allows the flow of fluid by allowing the blade portion to communicate from the one flow path to the other flow path via an impeller, and is a rotation direction side of the impeller. At least one of the blade portions formed by the pressure surface of the blade portion and the negative pressure surface on the back side of the pressure surface is cross-linked to a blade groove which is a gap between adjacent blade portions.
It is characterized by two arches.

[0007] In such a structure, at least one arch bridging the blade groove is provided, so that the vortex can be strongly wound between the blade portion and the flow channel without changing the flow channel. become.

According to a second aspect of the present invention, in the pump impeller according to the first aspect, an inner diameter side projection is provided at the center of the inner peripheral side of the impeller, the inner diameter side projection projecting in a mountain-shaped cross section. At least one arch bridging the blade groove between a side protrusion and a ring forming an outer peripheral surface of the impeller is provided.

In such a case, since the inner diameter side projection is provided between the ring and the center of the inner peripheral surface of the impeller,
Correspondingly, the inner diameter side projection and the arch can further improve the entrainment of the vortex. Therefore, the pressure rise is improved and the pump efficiency is improved.

[0010] Also, the ring prevents flow in the centrifugal direction. Therefore, an impact between the flowing fluid and the casing can be avoided, and noise can be reduced.

According to a third aspect of the present invention, in the pump impeller according to the first aspect, one lower arch is provided so as to be spaced apart from substantially a center of a peripheral surface on an inner diameter side of the impeller;
At least one upper arch bridging the blade groove between the lower arch and the ring is provided.

In such a case, since the lower arch is used instead of the inner diameter side projection, the inner diameter side of the lower arch can be used as a flow path, and a fluid communication flow path is ensured. Become.

[0013] The invention described in claim 4 is based on claim 1,
4. The pump impeller according to item 2 or 3, wherein the arch is formed to have a substantially triangular, trapezoidal, circular, circular, elliptical, or a combination thereof.

[0014] In such a case, since the shape of the arch is variously formed, selection can be made in accordance with the specifications of the pump.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

[0016]

Embodiment 1 A pump impeller according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

FIG. 1 is an exploded view showing a pump according to an embodiment.

In FIG. 1, 21 is a pump and 22 is a first pump.
The casing 32 is a second casing in which an impeller 42 is rotatably incorporated.
In addition, each casing 22, 32 adjacent to the impeller 42
On both inner wall surfaces 25 and 35, the first casing 22 circulating around the blade portion 45 of the impeller 42 and having the inflow port 23 is provided.
Is formed, and the other flow path 34 provided in the second casing 32 having the outflow port 33 is formed.

The pump 21 thus formed is rotated by the rotation of the impeller 42 so that the inlet 2
Fluid 71 flows into one flow path 24 from blade 3 and blade 4
The pump 21 is pressurized at 2 and fed through the other flow path 34 and discharged from an outlet 33 provided in the other flow path 34.

In FIG. 2 (a), the impeller 42 has a plurality of blades 45 formed therethrough through a wall surface 44a, leaving a ring 44 on the outer periphery of the impeller 42 at its peripheral edge.

The blade portion 45 has a pressure surface 45a in the rotation direction indicated by the arrow R of the impeller 42 formed in a valley shape, and a negative pressure surface 45b on the back surface formed in a mountain shape. In the blade groove 46 between the pressure surface 45a and the suction surface 45b,
The adjacent blade portions 45 are connected so as to be bridged, and an arch 47 having a substantially trapezoidal cross section is provided, and an inner diameter side projection 47a having a substantially mountain-shaped cross section is formed on an inner diameter side surface which is a lower surface facing the arch 47. I have.

FIG. 2B is a cross-sectional view showing the flow state of the fluid at the blade.

As shown in FIG. 2B, one of the flow paths 24 of the first casing 22 is rotated with the rotation of the impeller 42.
From the impeller 42 of the impeller 42
Abuts against the valley-shaped surface of the pressure surface 45a, and the vortex 7 flows toward one of the flow paths 24 from the resultant force of the tangential direction of the valley-shaped surface and the centrifugal direction.
11 is generated.

Similarly, the protrusion 4 penetrates through one of the flow paths 24.
7a and the other channel 3 separated by the arch 47
A vortex 711 is also generated on the fourth side, and the fluid 71 is pressurized between the blade part 42 and the two flow paths 24 and 34.

FIG. 2C is a cross-sectional view showing a state in which fluid flows out of the blade.

As shown in FIG. 2C, when the impeller 42 makes almost one rotation and the blade part 45 rotates to the outlet 33 of the other flow path 34 of the second casing 32, the other Flow path 34 disappears, and the second casing 32 comes into contact with the wall surface 44a of the blade part 45. Therefore, the pressurized fluid 71 flows toward the outlet 33 on the low pressure side, between the projection 47a and the arch 47, and between the arch 47 and the arch 47. Flows between 47 and the ring 44,
The liquid is discharged from the pump 21.

This discharge operation is performed every rotation. By rotating the impeller 42 at high speed, discharge can be performed almost continuously.

[First Modification of Blade] FIGS. 3 (a) and 3 (b)
FIG. 5 is a cross-sectional view showing Modification Example 1 of the blade section according to Embodiment 1.

As shown in FIG. 3A, the difference from FIG. 2 is that the arch 47 is a plurality of arches 47b.

That is, the plurality of arches 47b are composed of a horizontal upper arch 47b1 having a substantially elliptical cross section and a vertical lower slightly arch 47b2 having a substantially elliptical cross section.
The blade groove 46 is arranged between the ring 7a and the ring 44 so as to be spaced apart from each other in a T-shape.

Therefore, with the rotation of the impeller 42, the fluid 71 flowing from one of the flow paths 24 of the first casing 22 flows along the plurality of arches 47b through the pressure surface 45a of the blade part 45, and then flows along the plurality of arches 47b. A vortex 712 is generated toward the channel 24 side of the vortex. Similarly, a vortex 712 is also generated in the other flow path 34, and the blade portion 42 and each of the flow paths 24 and 34 are formed.
The pressure of the fluid 71 is increased.

FIG. 3B is a sectional view showing a state in which fluid flows out of the blade.

As shown in FIG. 3 (b), when the impeller 42 rotates substantially once and the blade 45 rotates to the outlet 33 of the other flow path 34 of the second casing 32, Toward the outlet 33, the inner diameter side projection 47a and the lower arch 47b2,
The fluid flows between the lower arch 47b2 and the upper arch 47b1, and between the upper arch and the ring 44, and is discharged from the pump 21.

Therefore, in the first modification, the gap between the inner diameter side projection 47a and the upper arch 47b1 is narrowed to provide the lower arch 47b2, so that the boundary separation at the center of the blade groove 46 can be surely performed, and the vortex 712 is reduced. The effect of increasing the pressure to increase the pump pressure is produced.

Other configurations and operations are the same as those of the first embodiment, and therefore the description thereof is omitted.

[Variation 2 of Blade] FIGS. 4 (a) and 4 (b)
FIG. 5 is a cross-sectional view showing Modification Example 2 of the blade section according to Embodiment 1.

As shown in FIG. 4A, the difference from FIG. 2 lies in that the arch 47 is a separation arch 47c.

That is, the separation arch 47c is formed by connecting the upper arch 47c1 having a substantially trapezoidal cross section and the lower arch 47c2 having a slightly smaller cross section to the inner side of the blade groove 46 and the ring 4.
4 so as to be adjustable in position between the adjacent blades 45.

Accordingly, the fluid 71 is supplied to one of the flow paths 24 of the first casing 22 as the impeller 42 rotates.
From the pressure surface 45 of the blade 45
a along the separation arch 47c through one of the flow paths 24.
A vortex 713 is generated toward the side. Similarly, a vortex 713 is also generated in the other flow path 34, and the fluid 71 is pressurized between the blade part 42 and each of the flow paths 24 and 34.

FIG. 4B is a cross-sectional view showing a state in which fluid flows out of the blade.

As shown in FIG. 4 (b), when the impeller 42 rotates substantially once and the blade portion 45 rotates to the outlet 33 of the other flow path 34 of the second casing 32, Toward the exit 33, the inner side 147 of the blade groove 46 and the lower arch 4
7c2, flows between the lower arch 47c2 and the upper arch 47c1, and between the upper arch and the ring 44, and is discharged from the pump 21.

Therefore, in the second modification, the gap between the upper arch 47c1 and the lower arch 47c2 is provided so as to be adjustable in position, so that the center boundary of the blade groove 46 can be reliably separated, the vortex 713 is strengthened, and the pump The effect of increasing the boost is produced.

Other configurations and operations are the same as those of the first embodiment, and therefore the description thereof is omitted.

[0044]

Second Embodiment A pump impeller according to a second embodiment of the present invention will be described with reference to FIG.

FIGS. 5A and 5B are exploded views showing a pump according to the second embodiment.

In FIG. 5A, the configuration of the impeller 42 is such that a ring 44 is left around the outer periphery of the
The plurality of blades 45 are formed by penetrating a.

The blade portion 45 has a pressure surface 45a in the rotation direction indicated by an arrow R of the impeller 42 formed in a valley shape, and a negative pressure surface 45b on the back surface formed in a mountain shape. In the blade groove 46 between the pressure surface 45a and the suction surface 45b,
Adjacent blade portions 45 are connected so as to be bridged on both wall surfaces 44a of the blade portions 45 to form a rod-shaped parallel arch 48 having a substantially circular cross section. Further, an inner diameter side projection 47a having a substantially mountain-shaped cross section is formed at the center of the peripheral surface of the inner diameter side 147 of the impeller 42.

FIG. 5B is a cross-sectional view showing the flow state of the fluid in the blade.

As shown in FIG. 5B, as the impeller 42 rotates in the direction of the arrow R, the fluid 71 flowing from the one flow path 24 of the first casing 22 causes the impeller 4 to rotate.
The second flow path 24 abuts against the valley surface of the pressure surface 45 a of the second blade portion 45, and from the resultant force between the tangential direction of the valley surface and the centrifugal direction.
A vortex 71A is generated toward the side.

When the vortex 71A flows around the parallel arch 48, a vortex 71a is formed around the arch 48, and the vortex 71A embraces the vortex 71a to form a strong layered vortex.

Similarly, on one side of the flow path 34 where one of the flow paths 24 communicates between the projection 48a and the parallel arch 48, a vortex 71a is generated which is attached to the parallel arch 48, and the wing portion is formed. 42 and a fluid 71 between each flow path 24 and 34.
Is increased in pressure as laminar swirls 71A, 71a. The pressurized fluid 71 flows between the protrusion 48 a and the parallel arch 48 and between the parallel arch 48 and the ring 44 toward the outlet 33 on the low pressure side, and is discharged from the pump 21.

Other configurations and operations are the same as those of the first embodiment, and therefore, description thereof will be omitted.

FIG. 6 is a cross-sectional view showing a state of fluid flow in a blade according to a third modification of the blade according to the second embodiment.

As shown in FIG. 6, the difference from FIG. 5 is that the substantially circular cross section of the parallel arch 48 of FIG. 5 is replaced by a substantially circular arc arch 48b.

That is, the arcuate arch 48b is arranged between the inner diameter side projection 48a and the ring 44 so that the surface side of the arc of section is substantially flush with the end wall surface 44a of the blade 45, and the blade groove is formed. 46, and were connected by being cross-linked.

Therefore, the vortex 71B generated in the blade groove 46 with the rotation of the impeller 42 whirls the vortex 71b attached to the plurality of arcs 48b in a layered manner, thereby increasing the pressure. Will occur.

Other structures and operations are the same as those of the second embodiment, and the description thereof is omitted.

[Fourth Modification of Blade] FIG. 7 is a cross-sectional view showing a fluid flowing state in a blade which is a fourth modification of the blade according to the second embodiment.

As shown in FIG. 7, the difference from FIG. 5 is that a substantially circular cross section of the parallel arch 48 of FIG. 5 is substantially elliptical in cross section and a step is provided to provide a step arch 48c. is there.

That is, the step arch 48c is formed by arranging two arches having a substantially elliptical cross section near the end of the blade 45 with a height difference between the inner diameter side projection 48a and the ring 44. It is connected to the groove 46 by being cross-linked.

Accordingly, the swirl 71C generated in the blade groove 46 with the rotation of the impeller 42 whirls the swirl 71c attached to the plurality of step arches 48c in a layered manner, thereby increasing the pressure. Will occur.

Further, the connection between the inner diameter side projection 48a and the ring 44 by changing the height of the two arches so as to have a step allows the boundary separation at the center of the blade groove 46 to be ensured. The effect of increasing the pressurization by increasing the eddy current is produced.

It should be noted that the arch member having a substantially circular or circular cross section may be used as the step arch 48c.

Other structures and operations are the same as those of the second embodiment, and the description thereof is omitted.

[0065]

According to the first aspect of the present invention, since at least one arch bridging the blade groove is provided, the vortex can be strongly wound between the blade portion and the flow channel without changing the flow channel. become. Therefore, the pressure rise in the blade section increases, and the pump efficiency improves.

According to the second aspect of the present invention, since the inner diameter side projection is provided between the center of the inner peripheral surface of the impeller and the ring, the inner diameter side projection and the arch correspond to each other to further improve the vortex entrainment. Can be done. Therefore, the pressure rise is improved and the pump efficiency is improved.

The ring prevents flow in the centrifugal direction. Therefore, an impact between the flowing fluid and the casing can be avoided, and noise can be reduced.

According to the third aspect of the present invention, since the lower arch is used in place of the inner diameter side projection, the inner diameter side of the lower arch can be used as a flow path, and a fluid communication flow path is secured. Therefore, the inflow / outflow efficiency is improved.

According to the fourth aspect of the present invention, since various shapes of the arch are formed, selection can be made according to the specifications of the pump. Therefore, a desired pump efficiency can be output.

[Brief description of the drawings]

FIG. 1 is an exploded view showing a pump according to Embodiments 1 and 2 of the present invention.

FIGS. 2A and 2B are views showing an arch provided in a blade groove of the impeller according to Embodiment 1 of the present invention, wherein FIG. 2A is a perspective view showing a part of a blade portion of the impeller, and FIG. FIG. 3C is a cross-sectional view illustrating a flow state of a fluid at the blade section, and FIG. 4C is a cross-sectional view illustrating a state of fluid flowing out of the blade section.

FIGS. 3A and 3B are diagrams showing a plurality of arches as a first modification of the blade according to the first embodiment, wherein FIG. 3A is a cross-sectional view showing a fluid flow state in the blade, and FIG. It is sectional drawing which shows the outflow state of the fluid from a part.

FIGS. 4A and 4B are diagrams showing a separation arch which is a second modification of the blade according to the first embodiment, wherein FIG. 4A is a cross-sectional view showing a fluid flowing state in the blade, and FIG. It is sectional drawing which shows the outflow state of the fluid from a part.

FIGS. 5A and 5B are views showing a parallel arch provided in a blade groove of an impeller according to Embodiment 2 of the present invention, wherein FIG. 5A is a perspective view showing a part of a blade portion of the impeller, and FIG. FIG. 4 is a cross-sectional view showing a fluid flowing state in a blade portion.

FIG. 6 is a sectional view showing a circular arc arch which is a third modification of the blade according to the second embodiment.

FIG. 7 is a sectional view showing a stepped arch which is a fourth modification of the blade according to the second embodiment.

FIGS. 8A and 8B are views showing a blade portion provided with a chevron projection in a blade groove of an impeller according to the related art, wherein FIG. 8A is a perspective view showing a part of the blade portion of the impeller, and FIG. FIG. 4 is a cross-sectional view illustrating a flow state of a fluid in a part.

[Explanation of symbols]

 Reference Signs List 22 first casing 23 inlet 24 one flow path 32 second casing 33 outlet 34 the other flow path 42 impeller for pump 45 blade part 45a pressure surface 45b negative pressure surface 46 Blade groove 47, 48 ... Arch 71 ... Fluid

Continued on the front page (72) Inventor Shotaro Abe 5-24-15 Minamidai, Nakano-ku, Tokyo Calsonic Kansei Corporation F-term (reference) 3H033 AA01 BB04 CC01 DD03 EE08 EE19

Claims (4)

[Claims] An impeller having a blade formed on a peripheral portion is rotatably provided in a casing comprising a first casing and a second casing, and the impeller of the first casing and the second casing is provided on the impeller. At each facing position, one flow path and the other flow path having an inflow port or an outflow port are provided,
By allowing the blade portion to communicate from the one flow path to the other flow path through the impeller, to allow inflow and outflow of fluid,
A pump impeller, wherein a pressure surface of the impeller portion on a rotational direction side of the impeller;
A pump impeller provided with at least one arch that bridges a blade groove, which is a gap between adjacent blade portions, of a blade portion formed by a negative pressure surface on a back surface side of the pressure surface. 2. An impeller provided with an inner-diameter projection projecting in a chevron shape at the center of an inner peripheral surface of the impeller, wherein the impeller is disposed between the inner projection and a ring forming an outer peripheral surface of the impeller. The pump impeller according to claim 1, wherein at least one arch that bridges the groove is provided. 3. A lower arch is provided at a distance from substantially the center of the inner peripheral surface of the impeller, and at least one upper arch bridging the blade groove between the lower arch and the ring. The impeller for a pump according to claim 1, wherein the impeller is provided. 4. The pump vane according to claim 1, wherein said arch is formed to have a cross-sectional shape of substantially a triangle, a trapezoid, a circle, an arc, an ellipse, or a combination thereof. car.