WO2024024791A1 - Rotary device - Google Patents

Abstract

This rotary device (100) comprises: an impeller 1; a plurality of movable-type vanes 2 which are disposed upstream or downstream from the impeller 1 and operated so as to adjust the cross-sectional area of a flow passage; and an inner wall 3 and an outer wall 4 which define the flow passage. In a radial direction r of the impeller 1, or in a direction inclined with respect to both the axial direction x and the radial direction r of the impeller 1, the inner wall 3 and the outer wall 4 include a plurality of groups of flat surfaces 31, 41 which are parallel to each other and face each other with the movable vanes 2 therebetween. When viewed in the axial direction x of the impeller 1, the inner wall 3 and the outer wall 4 have polygonal shapes corresponding to each other.

Description

rotating device

The present disclosure relates to a rotating device. This application claims the benefit of priority based on Japanese Patent Application No. 2022-121177 filed on July 29, 2022, the contents of which are incorporated into this application.

Rotating devices such as turbines and compressors include various flow formats such as axial flow, mixed flow, and radial flow. These rotating devices may include movable vanes to adjust the cross-sectional area of the flow path.

For example, in a radial flow type rotating device, the movable vanes are arranged in an annular flow path that extends perpendicularly to the central axis of the impeller. The movable vane is rotatably mounted on a plane perpendicular to the central axis of the impeller. Each vane has an axis of rotation parallel to the plane normal. In a radial flow type rotating device, since the vanes are arranged on a plane, the clearance between the end face of the vane and the plane is constant regardless of the rotation angle of the vane.

In contrast, in axial flow rotating devices, the movable vanes are arranged in a cylindrical flow path concentric with the impeller. The movable vanes are rotatably mounted on a cylindrical surface concentric with the impeller. Each vane has an axis of rotation parallel to the normal to the cylindrical surface. The cylindrical surface is straight in the generatrix direction but curved in the circumferential direction. From this, the clearance between the end face of the vane and the cylindrical surface changes depending on the rotation angle of the vane. Specifically, as the vane moves to a more oblique position with respect to the central axis of the impeller, the end face of the vane moves away from the cylindrical surface and the clearance between the vane and the cylindrical surface increases.

Similarly, in a mixed-flow rotating device, the movable vanes are arranged in a conical flow path concentric with the impeller. The movable vanes are rotatably mounted on a conical surface concentric with the impeller. Each vane has an axis of rotation parallel to the normal to the conical surface. The conical surface is straight in the generatrix direction but curved in the circumferential direction. From this, the clearance between the end face of the vane and the conical surface changes depending on the rotation angle of the vane. Specifically, as the vane moves to a more oblique position with respect to the central axis of the impeller, the end face of the vane moves away from the conical surface and the clearance between the vane and the conical surface increases.

To address the above-mentioned problems, Patent Documents 1 and 2 below disclose a configuration in which the clearance between the vane and the surface is maintained constant regardless of the rotation angle of the vane in a mixed flow turbine. In these mixed flow turbines, the wall surface of the flow path is formed in a spherical shape, and the movable vanes are rotatably mounted on the spherical surface. A spherical surface is similarly curved in both the generatrix and circumferential directions. The end surface of the vane has a curved shape corresponding to a spherical surface. Therefore, the clearance between the vane and the spherical surface remains constant no matter what rotational angle the vane is in with respect to the central axis of the impeller.

Japanese Patent Application Publication No. 2000-120442 Special Publication No. 2014-534378

In the mixed flow turbines of Patent Documents 1 and 2, once the shape of the impeller and the position of the edge of the vane when the movable vane approaches the impeller most are determined, the shape of the spherical surface is almost automatically determined. Therefore, the shape of the vane and the shape of the wall surface of the flow path are also determined almost automatically. As a result, design flexibility is limited.

An object of the present disclosure is to provide an axial or mixed flow rotating device that can ensure design flexibility.

In order to solve the above problems, a rotating device according to one aspect of the present disclosure includes an impeller, a plurality of movable vanes that are arranged upstream or downstream of the impeller, and are operated to adjust the cross-sectional area of a flow path. , an inner wall and an outer wall defining a flow path, the inner wall and the outer wall being movable in the radial direction of the impeller or in a direction inclined with respect to both the axial direction and the radial direction of the impeller. an inner wall and an outer wall including a plurality of sets of mutually parallel planes facing each other across a type vane, the inner wall and the outer wall having corresponding polygonal shapes when viewed in the axial direction of the impeller; and.

Each of the plurality of movable vanes may have a trapezoidal shape when viewed in the normal direction of the side surface of each movable vane.

Adjacent movable vanes may form a gap between them when the plurality of movable vanes minimizes the cross-sectional area of the flow path.

At least one of the inner wall and the outer wall has a circular shape and a polygonal shape in at least one of an end continuous with the space accommodating the impeller and an end opposite to the space accommodating the impeller in the axial direction. It may also include a connecting transition interval.

The polygonal shape may be a regular polygonal shape.

The interior angles of the polygon may be obtuse angles.

According to the present disclosure, it is possible to maintain a constant clearance between the movable vane and the surface while ensuring design flexibility.

FIG. 1 is a schematic perspective view of the rotating device according to the first embodiment when the movable vane is in the open position. FIG. 2 is a schematic cross-sectional view of the rotating device according to the first embodiment. FIG. 3 is a schematic perspective view of the rotating device according to the first embodiment when the movable vane is in the closed position. FIG. 4 is a schematic perspective view of a rotating device according to a second embodiment.

Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The specific dimensions, materials, numerical values, etc. shown in the embodiments are merely examples for easy understanding, and do not limit the present disclosure unless otherwise specified. In this specification and the drawings, elements having substantially the same functions and configurations are designated by the same reference numerals and redundant explanation will be omitted. Further, illustrations of elements not directly related to the present disclosure are omitted.

FIG. 1 is a schematic perspective view of the rotating device 100 according to the first embodiment when the movable vane 2 is in the open position.

Referring to FIG. 1, for example, rotating device 100 can be a turbine or a compressor. For example, the rotating device 100 can be applied to a turbine or a compressor of a supercharger. The rotating device 100 is not limited to this, and may be applied to other devices. The rotating device 100 includes an impeller 1, a plurality of movable vanes 2, an inner wall 3, and an outer wall 4. Rotating device 100 may further include other components.

The impeller 1 is housed in a space S1 defined by a housing (not shown). The impeller 1 rotates around the central axis A1. In this disclosure, the axial direction, radial direction, and circumferential direction of the impeller 1 may be simply referred to as axial direction x, radial direction r, and circumferential direction c, respectively.

FIG. 2 is a schematic cross-sectional view of the rotating device 100 according to the first embodiment. The cross-sectional view of FIG. 2 includes the central axis A1 of the impeller 1. In this embodiment, the impeller 1 is a mixed flow impeller. In FIG. 2, when fluid flows from left to right, the impeller 1 directs the fluid flowing into the impeller 1 along the axial direction x along a direction i1 inclined with respect to both the axial direction x and the radial direction r. send out. In FIG. 2, when the fluid flows from right to left, the impeller 1 sends out the fluid that flows into the impeller 1 along the direction i1 along the axial direction x. In other embodiments, the impeller 1 may be an axial impeller. The axial impeller sends out fluid that flows into the impeller 1 along the axial direction x.

Referring to FIG. 1, impeller 1 includes a hub 11 and a plurality of vanes 12. In this embodiment, the hub 11 has a frustoconical shape. When the impeller 1 is an axial impeller, the hub 11 may have a cylindrical shape. The vane 12 is fixed to the side surface of the hub 11. In this embodiment, the impeller 1 includes nine vanes 12. The number of vanes 12 is not limited to this, and may be less than nine or more than nine.

The movable vane 2 is arranged upstream or downstream of the impeller 1 depending on the direction of fluid flow. The plurality of movable vanes 2 are arranged apart from each other along the circumferential direction c. In this embodiment, the rotating device 100 includes twelve movable vanes 2. The number of movable vanes 2 is not limited to this, and may be less than 12 or more than 12. The movable vane 2 is operated to adjust the cross-sectional area of the flow path (details will be described later).

The inner wall 3 and the outer wall 4 define a part of the flow path. The inner wall 3 and the outer wall 4 are stationary walls. The inner wall 3 and the outer wall 4 may be part of a housing (not shown). Alternatively, one or both of the inner wall 3 and the outer wall 4 may be separate members from the housing and may be attached to the housing.

Referring to FIG. 2, inner wall 3 includes a plurality of flat surfaces 31. As shown in FIG. The plane 31 faces radially outward. The outer wall 4 includes a plurality of planes 41. The plane 41 faces radially inward. The number of planes 31 and the number of planes 41 are equal to the number of movable vanes 2. In this embodiment, the inner wall 3 includes twelve planes 31 and the outer wall 4 includes twelve planes 41. The inner wall 3 and the outer wall 4 are arranged such that the plurality of planes 31 and the plurality of planes 41 are parallel to each other. In this embodiment, the plane 31 and the plane 41 face each other with the movable vane 2 in between in the direction i2 inclined in both the axial direction x and the radial direction r. Direction i2 may be perpendicular to the above-mentioned direction i1 in which the fluid flows. When the impeller 1 is an axial impeller, the inner wall 3 and the outer wall 4 may face each other with the movable vane 2 in between in the radial direction r.
Since the plane 41 is located on the radially outer side of the plane 31, the plane 41 is longer than the plane 31 in the circumferential direction c.

Referring to FIG. 1, the inner wall 3 and the outer wall 4 have a polygonal shape including the same number of corners as the number of movable vanes 2 when viewed in the axial direction x. In this embodiment, the inner wall 3 and the outer wall 4 have a regular dodecagonal shape when viewed in the axial direction x. The inner wall 3 and the outer wall 4 are not limited to this, and may have other polygonal shapes depending on the number of movable vanes 2. In three dimensions, the inner wall 3 and the outer wall 4 have a truncated polygonal shape with a number of sides equal to the number of movable vanes 2. In this embodiment, the inner wall 3 and the outer wall 4 have a truncated dodecagonal pyramid shape. When the impeller 1 is an axial impeller, the inner wall 3 and the outer wall 4 may have a polygonal cylindrical shape in three dimensions, including a number of sides equal to the number of movable vanes 2. .

In this embodiment, when viewed in the axial direction x, the interior angle between adjacent planes 31 is 150 degrees (150=180×(n-2)/n, n=12). Similarly, the internal angle between adjacent planes 41 is 150 degrees. In other embodiments, the interior angles of the polygon may be obtuse angles other than 150 degrees. In this case, when viewed in the axial direction x, the inner wall 3 and the outer wall 4 have a polygonal shape including five or more corners.

Referring to FIG. 2, inner wall 3 and outer wall 4 define a space S2 therebetween. The space S2 is continuous with the above-mentioned space S1 that accommodates the impeller 1. Space S1 and space S2 form part of a flow path.

The movable vane 2 is arranged in the space S2. Specifically, the movable vane 2 is rotatably attached to at least one of the plane 31 and the plane 41. The movable vane 2 rotates around the central axis A2. The central axis A2 is parallel to the perpendiculars of the planes 31 and 41. From another perspective, the central axis A2 is perpendicular to the direction i1. The central axis A2 intersects the central axis A1 of the impeller 1. As the movable vane 2 rotates around the central axis A2, the cross-sectional area of the flow path is adjusted. For example, the rotating device 100 may include a drive mechanism (not shown) inside the inner wall 3 or outside the outer wall 4 for rotating the movable vane 2 .

In FIG. 1, the movable vane 2 is placed in the open position. In the open position, the movable vanes 2 maximize the cross-sectional area of the flow path.

FIG. 3 is a schematic perspective view of the rotating device 100 according to the first embodiment when the movable vane 2 is in the closed position. In FIG. 2, the movable vane 2 is placed in the closed position. In the closed position, the movable vanes 2 minimize the cross-sectional area of the flow path. As can be seen from FIGS. 1 and 3, in the closed position, the movable vane 2 is arranged at a more oblique position with respect to the central axis A1 of the impeller 1 than in the open position.

Referring to FIG. 2, in the movable vane 2, the end surface 21 that contacts or opposes the plane 31 is formed flat along the plane 31. Similarly, in the movable vane 2, the end surface 22 that contacts or opposes the plane 41 is formed flat along the plane 41.

Referring to FIG. 3, as described above, the outer plane 41 is longer than the inner plane 31 in the circumferential direction c. Therefore, the space S2 between the plane 41 and the plane 31 has a trapezoidal shape when viewed in the fluid flow direction i1 (see FIG. 2). The movable vanes 2 have a trapezoidal shape when viewed in the normal direction of the side surface 23 of each movable vane 2 so as to fit into this space S2. According to such a configuration, the movable vane 2 can efficiently cover the space S2 between the plane 41 and the plane 31 in the closed position. Further, referring to FIG. 3, the movable vanes 2 are designed to form a slight gap between adjacent movable vanes 2 in the closed position. According to such a configuration, when the movable vanes 2 rotate, contact between adjacent movable vanes 2 can be avoided.

The rotating device 100 as described above includes an impeller 1, a plurality of movable vanes 2 that are arranged upstream or downstream of the impeller 1 and are operated to adjust the cross-sectional area of a flow path, and an inner vane that defines a flow path. A wall 3 and an outer wall 4 are provided. The inner wall 3 and the outer wall 4 include a plurality of sets of parallel planes 31 and 41 that face each other with the movable vane 2 in between in the direction i2 inclined in both the axial direction x and the radial direction r. The inner wall 3 and the outer wall 4 have corresponding polygonal shapes when viewed in the axial direction x of the impeller 1. According to such a configuration, the polygonal inner wall 3 and outer wall 4 include a plane 31 and a plane 41 that are parallel to each other. Therefore, the movable vane 2 can be arranged between planes 31 and 41 that are parallel to each other. In this case, the end surfaces 21 and 22 of the movable vane 2 can be formed into a planar shape. According to such a configuration, even if the movable vane 2 moves from the open position (FIG. 1) to the closed position (FIG. 2) that is more oblique with respect to the central axis A1 of the impeller 1, the movable vane 2 remains in contact with the end surface 21 and the plane. 31 and the gap between the end surface 22 and the plane 41 are maintained constant. Furthermore, compared to the mixed flow turbines of Patent Documents 1 and 2, there is no need to form the end faces 21, 22 and the flat surfaces 31, 41 into spherical shapes, so flexibility in design is ensured. Therefore, the clearance between the movable vane 2 and the flat surfaces 31 and 41 can be maintained constant while ensuring design flexibility.

Furthermore, in the rotating device 100, each of the plurality of movable vanes 2 has a trapezoidal shape when viewed in the normal direction of the side surface 23 of each movable vane 2. As mentioned above, the space between plane 41 and plane 31 has a trapezoidal shape. Therefore, according to such a configuration, the movable vane 2 can efficiently cover the space between the plane 41 and the plane 31 in the closed position.

Furthermore, in the rotating device 100, when the plurality of movable vanes 2 minimize the cross-sectional area of the flow path, adjacent movable vanes 2 form a gap between them. According to such a configuration, when the movable vanes 2 rotate, contact between adjacent movable vanes 2 can be avoided.

Furthermore, in the rotating device 100, the polygonal shape is a regular polygonal shape. According to such a configuration, the rotation device 100 can be balanced.

Furthermore, in the rotating device 100, the interior angles of the polygon are obtuse angles. According to such a configuration, it is possible to prevent the outer plane 41 from becoming excessively longer than the inner plane 31 in the circumferential direction c. Therefore, the rotation device 100 can be balanced.

Next, other embodiments will be described.

FIG. 4 is a schematic perspective view of a rotating device 100A according to the second embodiment.

The rotating device 100A differs from the rotating device 100 of the first embodiment in that the inner wall 3A includes transition sections 32 and 33. The other points of the rotating device 100A may be the same as the rotating device 100.

In the inner wall 3A, the end surface adjacent to the above-mentioned space S1 that accommodates the impeller 1 has a circular shape. The inner wall 3A includes a transition section 32 that smoothly connects a circular end surface and a regular dodecagonal shape. For example, transition interval 32 can be chamfered.

Similarly, in the inner wall 3A, the end surface on the opposite side to the space S1 in the axial direction x also has a circular shape. The inner wall 3A includes a transition section 33 that smoothly connects a circular end surface and a regular dodecagonal shape. For example, transition section 33 can be chamfered.

The outer wall 4 may also include similar transition sections at the end adjacent to the space S1 and at the opposite end.

Such a rotating device 100A can obtain the same effects as the rotating device 100 of the first embodiment.

Further, in the rotating device 100A, at least one of the inner wall 3 and the outer wall 4 has a transition section 32 connecting the circular shape and the polygonal shape at an end continuous with the space S1 that accommodates the impeller 1 in the axial direction x. include. Furthermore, at least one of the inner wall 3 and the outer wall 4 includes a transition section 33 connecting the circular shape and the polygonal shape at the end opposite to the space S1 that accommodates the impeller 1 in the axial direction x. According to such a configuration, fluid can be guided smoothly.

Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to such embodiments. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the claims, and it is understood that these naturally fall within the technical scope of the present disclosure. be done.

For example, in the above embodiment, the inner wall 3 and the outer wall 4 have a regular polygonal shape when viewed in the axial direction x. However, in other embodiments, the inner wall 3 and the outer wall 4 may not have a regular polygonal shape when viewed in the axial direction x. For example, the lengths of multiple sides of a polygon may not be equal.

1 Impeller 2 Movable vane 3 Inner wall 3A Inner wall 4 Outer wall 23 Side surface of movable vane 32 Transition section 33 Transition section 100 Rotating device 100A Rotating device i2 Direction inclined to both the axial direction and radial direction of the impeller r Radial direction of the impeller S1 Space (flow path) that accommodates the impeller
S2 Section (flow path) that accommodates the movable vane
x Impeller axial direction

Claims (15)

1. impeller and
   a plurality of movable vanes disposed upstream or downstream of the impeller and operated to adjust the cross-sectional area of the flow path;
   an inner wall and an outer wall defining the flow path,
   The inner wall and the outer wall are parallel to each other and face each other across the movable vane in the radial direction of the impeller or in a direction inclined with respect to both the axial direction and the radial direction of the impeller. Contains multiple sets of planes,
   the inner wall and the outer wall have corresponding polygonal shapes when viewed in the axial direction of the impeller;
   an inner wall and an outer wall;
   Equipped with
   Rotating device.
2. The rotating device according to claim 1, wherein each of the plurality of movable vanes has a trapezoidal shape when viewed in the normal direction of the side surface of each movable vane.
3. The rotating device according to claim 1 or 2, wherein when the plurality of movable vanes minimize the cross-sectional area of the flow path, adjacent movable vanes form a gap between them.
4. At least one of the inner wall and the outer wall has a circular shape in the axial direction at least one of an end continuous with the space accommodating the impeller and an end opposite to the space accommodating the impeller. The rotating device according to claim 1 or 2, comprising a transition section connecting the polygonal shape and the polygonal shape.
5. At least one of the inner wall and the outer wall has a circular shape in the axial direction at least one of an end continuous with the space accommodating the impeller and an end opposite to a section accommodating the impeller. The rotating device according to claim 3, further comprising a transition section connecting the polygonal shape and the polygonal shape.
6. The rotating device according to claim 1 or 2, wherein the polygonal shape is a regular polygonal shape.
7. The rotating device according to claim 3, wherein the polygonal shape is a regular polygonal shape.
8. The rotating device according to claim 4, wherein the polygonal shape is a regular polygonal shape.
9. The rotating device according to claim 5, wherein the polygonal shape is a regular polygonal shape.
10. The rotating device according to claim 1 or 2, wherein the interior angles of the polygonal shape are obtuse angles.
11. The rotating device according to claim 3, wherein the interior angles of the polygon are obtuse angles.
12. The rotating device according to claim 4, wherein the interior angles of the polygon are obtuse angles.
13. The rotating device according to claim 5, wherein the interior angles of the polygon are obtuse angles.
14. The rotating device according to claim 6, wherein the interior angles of the polygon are obtuse angles.
15. The rotating device according to claim 7, wherein the interior angles of the polygonal shape are obtuse angles.

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