WO2020017182A1

WO2020017182A1 - Blower

Info

Publication number: WO2020017182A1
Application number: PCT/JP2019/022664
Authority: WO
Inventors: 真俊川埼; 優輝高橋
Original assignee: サンデン・オートモーティブクライメイトシステム株式会社
Priority date: 2018-07-18
Filing date: 2019-06-07
Publication date: 2020-01-23
Also published as: WO2020241095A1; CN112400066B; JP2020020338A; CN112400066A

Abstract

[Problem] To provide a blower that makes it possible to improve low-noise properties by curbing disturbance to a circulating flow that flows into a start side from an end side of a spiral ventilation path. [Solution] A surface in a first side panel 31, which is at a start side and an end side of a spiral ventilation path 36 and which forms a connecting ventilation path 38 that extends in a direction of rotation of an impeller 10 from an end of the spiral ventilation path 36 and connects to a start of the spiral ventilation path 36, is formed by connecting tilted surfaces the height thereof changes gradually. A projecting part 31b is provided at the radial inner side of the surface in the first side panel 31, which is at the start side and the end side of the spiral ventilation path 36 and which forms the connection ventilation path 38, the projecting part extending in the circumferential direction of the impeller 10 along the outer peripheral side of the impeller 10 and projecting out toward a second side panel 32.

Description

Blower

The present invention relates to, for example, a blower used for a vehicle air conditioner.

Conventionally, as this type of blower, a blower including a cylindrical impeller and a casing having a spiral ventilation path formed radially outside the impeller housed therein is known (for example, Patent Document 1).

The casing is provided on a first side plate provided on one end side in the axial direction of the impeller, a second side plate provided on the other end side in the axial direction, on which an air intake port is formed, and provided on a radially outer side of the impeller. An outer peripheral plate. The spiral ventilation path is formed between the first side plate and the second side plate and between the outer peripheral portion of the impeller and the outer peripheral plate.

(4) In the spiral ventilation path, the cross-sectional area of the flow path is gradually increased from the start end to the end in order to allow the air having a reduced flow velocity to flow out from the discharge port.

In the blower, the distance between the rotating shaft of the impeller and the outer peripheral plate is gradually increased from the start end side to the end side of the spiral ventilation passage, and the first side plate is gradually extended in one of the rotating shaft directions of the impeller. With this arrangement, the cross-sectional area of the spiral ventilation path is gradually increased. For this reason, in the blower, a step is formed in the first side plate of the casing between the start end and the end of the spiral ventilation path.

JP-A-5-195959

では In the blower, a circulating flow is generated in which the air flowing through the spiral ventilation path flows from the terminal end to the start end again. In the blower, when the flow of air flowing along the first side plate collides with the step portion when the circulating flow flows from the end side to the start end side of the spiral ventilation path, the air flow separates from the first side plate. As a result, the flow of air is disturbed on the start end side of the spiral ventilation passage. In the blower, if a turbulence occurs in the air flow at the start end side of the spiral ventilation path, it may cause noise.

An object of the present invention is to provide a blower capable of improving noise reduction by suppressing turbulence of a circulating flow flowing from the end side to the start side of a spiral ventilation path.

In order to achieve the above object, a blower of the present invention includes a tubular impeller, a casing in which the impeller is housed therein, and a spiral ventilation path formed radially outside the impeller housed therein. The casing comprises: a first side plate provided on one end side in the rotation axis direction of the impeller; a second side plate provided on the other end side in the rotation axis direction and formed with an air intake port; and a diameter of the impeller. An outer peripheral plate provided on the outer side in the direction, and extending in the rotation direction of the impeller from the start and end sides of the spiral ventilation passage in the first side plate and the second side plate, and from the terminal end of the spiral ventilation passage. The surface forming the connection ventilation path connected to the starting end of the path is formed by connecting one or both of a flat surface having a constant height and an inclined surface having a gradually changing height, and a first side plate. At the beginning and end of the spiral ventilation path and the connecting ventilation path The radially inner that plane, provided so as to extend along the outer periphery of the impeller in the circumferential direction of the impeller, projection projecting toward the second side plate side.

Accordingly, the first and second side plates have a smooth end surface having no steps, and the start and end sides of the spiral air passage and the surfaces forming the connection air passages are smooth surfaces having no steps. The circulating flow flowing from the terminal side to the start end of the spiral ventilation path along the connection ventilation path flows along the first side plate and the second side plate without separation, and the terminal side and the start end of the spiral ventilation path Air flowing out of the impeller in the vicinity of the side and the connection ventilation path flows along the protrusion and flows into the spiral ventilation path or the connection flow path, and turbulence of the air is suppressed.

According to the present invention, the circulating flow flowing from the end side to the start end side of the spiral ventilation path through the connection ventilation path along the first side plate and the second side plate is not separated from the first side plate and the second side plate. While flowing along the first side plate and the second side plate, the air flowing out of the outer peripheral portion of the impeller near the end side and the starting end side of the spiral ventilation path and near the connection ventilation path is caused to flow along the protrusion to form a spiral. By causing the air to flow into the ventilation path or the connection ventilation path, the occurrence of turbulence in the air can be suppressed, so that the generation of sound can be suppressed and the quietness can be improved.

1 is an overall perspective view of a blower showing an embodiment of the present invention. It is a top view of a blower. It is a plane sectional view of a blower. FIG. 3 is a sectional view taken along line AA of FIG. 2.

FIGS. 1 to 4 show an embodiment of the present invention.

The blower 1 of the present invention is a centrifugal blower as shown in FIG. 1, and is used, for example, as a blower of a vehicle air conditioner.

As shown in FIG. 4, the blower 1 includes an impeller 10 formed in a cylindrical shape, an electric motor 20 for rotating the impeller 10, and a casing 30 in which the impeller 10 is housed. Have.

As shown in FIGS. 3 and 4, the impeller 10 is disposed at a predetermined interval in the circumferential direction and is provided at one axial end with a plurality of blades 11 extending in a cylindrical axial direction. And a rim 13 provided on the other end side in the axial direction.

The plurality of blades 11 are arranged so as to extend from the radially inner side to the outer side. The plurality of blades 11 each have a radially outer side curved toward one side in a circumferential direction with respect to a radially inner side.

The substrate 12 is a disk-shaped member in which one ends of the plurality of blades 11 are connected to each other on the outer peripheral side at intervals in the circumferential direction. The substrate 12 has a projection 12a that gradually projects from the radially inner side of the outer peripheral portion to which the one end of each blade 11 is connected to the center toward the other end in the axial direction. On one end surface in the axial direction of the protruding portion 12a, a concave portion is formed which is gradually depressed toward the other end in the axial direction toward the center in the radial direction with respect to the outer peripheral side.

The rim 13 is a cylindrical member in which the other ends of the plurality of blades 11 are connected to each other at intervals in the circumferential direction.

As shown by an arrow in FIG. 4, when the impeller 10 is rotated in one circumferential direction around the center in the radial direction as a rotation axis, air flows inward from the other end side in the rotation axis direction, and the gap between the blades 11 Radially outflows air from the outside.

(4) As shown in FIG. 4, the electric motor 20 is disposed at one axial end of the impeller 10 in a recess at one end surface of the substrate 12 in the rotational axis direction. The electric motor 20 has a rotating shaft 21 connected to the radial center of the substrate 12 and rotates the impeller 10 in one circumferential direction.

As shown in FIG. 4, the casing 30 includes a first side plate 31 provided at one end of the impeller 10 in the rotation axis direction, a second side plate 32 provided at the other end of the impeller 10 in the rotation axis direction, An outer peripheral plate 33 extending between the outer peripheral portions of the first side plate 31 and the second side plate 32 in the circumferential direction of the impeller 10.

モータ A motor support hole 31a for supporting the electric motor 20 in a penetrated state is provided at a substantially central portion of the first side plate 31.

吸入 A suction port 34 for sucking air into the casing 30 is provided at a substantially central portion of the second side plate 32. At the edge of the suction port 34 of the second side plate 32, a cover 32a is provided which surrounds the other end of the rim 13 of the impeller 10 in the rotation axis direction, and radially inside and outside.

As shown in FIG. 3, the outer peripheral plate 33 gradually increases in distance from the rotation axis of the impeller 10 from a predetermined reference position S away from the rotation axis of the impeller 10 toward the rotation direction of the impeller 10. A spiral part 33a, a straight part 33b extending linearly from a radially outer end of the spiral part 33a, and a predetermined radius of curvature from a radially inner end of the spiral part 33a, opposite to the spiral part 33a. It has a tongue 33c that extends in a curved manner in the direction, and an extension 33d that extends from the tongue 33c and extends at an interval from the linear portion 33b.

1 and 2, the casing 30 is provided with a discharge port 35 for discharging the air sucked into the casing 30 through the suction port 34, as shown in FIGS. As shown in FIGS. 2 and 3, the discharge port 35 is formed at an end of a portion surrounded by the first side plate 31, the second side plate 32, the linear portion 33b, and the extension portion 33d.

As shown in FIG. 3, the casing 30 has a spiral ventilation path 36 for flowing the inflowing air on the outer peripheral side of the impeller 10 in the rotation direction of the impeller 10, and an end portion of the spiral ventilation path 36. A discharge ventilation path 37 communicating with the outlet 35 and a connection ventilation path 38 extending from the end of the spiral ventilation path 36 in the rotation direction of the impeller 10 and connected to the start end of the spiral ventilation path 36 are provided. I have.

The spiral ventilation passage 36 is provided between the first side plate 31 and the second side plate 32 and between the outer peripheral portion of the impeller 10 and the portion of the outer peripheral plate 33 located on the spiral portion 33a side of the spiral portion 33a and the straight portion 33b. It is provided between them. As shown in FIG. 3, the spiral ventilation passage 36 gradually increases in size in the radial direction from the start end to the end.

寸法 In the spiral ventilation passage 36, the dimension H of the impeller 10 in the rotation axis direction changes between the start end and the end. That is, the spiral ventilation passage 36 is formed such that the dimension H in the rotation axis direction of the impeller 10 is gradually reduced from the start end and the end to the predetermined position P between the start end and the end of the spiral ventilation passage 36. Have been. The predetermined position P between the start end and the end of the spiral ventilation path 36 is set in the direction of rotation of the impeller 10 from the position S of the radially inner end of the spiral 33 a around the rotation axis of the impeller 10. At a predetermined angle θ. The predetermined angle θ is desirably in the range of 90 degrees to 150 degrees. Further, the predetermined angle θ is more desirably approximately 120 degrees.

Specifically, the spiral ventilation path 36 is formed between the second flat plate 32 and the first flat plate 31 whose distance from the second flat plate 32 gradually changes. In the first side plate 31, portions corresponding to the start end and the end of the spiral ventilation path 36 are formed at substantially the same height. Further, the first side plate 31 gradually extends from the portion corresponding to the start end and the end of the spiral ventilation passage 36 to the portion corresponding to the predetermined position P between the start end and the end of the spiral ventilation passage 36. It overhangs to the 32 side.

The discharge air passage 37 is provided between the first side plate 31 and the second side plate 32, and between a portion of the straight portion 33b located on the discharge port 35 side and the extension portion 33d. As shown in FIG. 3, the size of the discharge ventilation path 37 in the radial direction gradually increases from the end of the spiral ventilation path 36 toward the discharge port 35. The discharge air passage 37 is separated from the start end of the spiral air passage 36 by a tongue 33c.

The connection ventilation passage 38 is provided between the first side plate 31 and the second side plate 32 and between the outer peripheral portion of the impeller 10 and the terminal end of the spiral ventilation passage 36. The surface of the first side plate 31 corresponding to the connection ventilation passage 38 is formed at substantially the same height as the start end and the end of the spiral ventilation passage 36. The surface of the first side plate 31 corresponding to the connection ventilation passage 38 is formed flush with the start end side of the spiral ventilation passage 36, and the portion corresponding to the terminal end of the spiral ventilation passage 36 does not have a step. They are connected at the same height.

In the first side plate 31, a protrusion 31 b protruding toward the second side plate 32 is provided radially inward of a surface corresponding to the start end side and the end side of the connection ventilation path 38 and the spiral ventilation path 36. .

The protrusion 31b extends in the circumferential direction outside the impeller 10 in the radial direction. The protrusion 31b extends from the position S at the radially inner end of the spiral part 33a around the rotation axis of the impeller 10 toward the rotation direction of the impeller 10 from the predetermined angle θ1 through the position S to the predetermined angle θ2. Is formed up to. The predetermined angle θ1 is desirably in a range from 180 degrees to 290 degrees. Further, the predetermined angle θ2 is desirably in the range of 40 degrees to 60 degrees.

突 The height of the projection 31b decreases from the connection ventilation passage 38 toward the start end and the end of the spiral ventilation passage 36. The portion of the protrusion 31b where the height dimension is the largest protrudes toward the second side plate 32 to a position near the height position of the upper surface of the outer peripheral side of the substrate 12 of the impeller 10.

(4) On the outer peripheral side of the protruding portion 31b, there is provided an inclined surface 31c whose height dimension gradually decreases outward in the radial direction. The inclined surface 31c is formed between the end of the spiral ventilation passage 36 on the terminal end side of the projection 31b and the connection ventilation passage 38.

In the blower 1 configured as described above, when the electric motor 20 is driven to rotate the impeller 10 in one circumferential direction, the air outside the casing 30 flows through the suction port 34 provided in the second side plate 32. And is sucked into the casing 30. The air sucked into the casing 30 through the suction port 34 flows inward from the other axial end of the impeller 10 and radially flows out from the outer peripheral portion of the impeller 10. The air radially flowing from the outer periphery of the impeller 10 flows through the spiral ventilation path 36 and the discharge ventilation path 37 of the casing 30 and is discharged from the discharge port 35, and a part of the air is terminated at the end of the spiral ventilation path 36. Flows from the side through the connection ventilation passage 38 into the start end side of the spiral ventilation passage 36 as a circulating flow.

At this time, the surfaces of the first side plate 31 corresponding to portions extending from the end side of the spiral ventilation path 36 to the start end side of the spiral ventilation path 36 via the connection ventilation path 38 have substantially the same height without any step. Is formed. For this reason, the circulating flow flowing from the terminal side to the starting end side of the spiral ventilation path 36 via the connection ventilation path 38 along the first side panel 31 does not separate from the first side panel 31 and flows along the first side panel 31. As a result, the turbulence of the air flow on the start end side of the spiral ventilation passage 36 is suppressed.

A protrusion 31b is formed on the first side plate 31 at a radially inner side of a surface corresponding to a portion extending from the end side of the spiral air passage 36 to the start end side of the spiral air passage 36 via the connection air passage 38. I have. For this reason, in a portion extending from the end side of the spiral ventilation path 36 to the start end side of the spiral ventilation path 36 via the connection ventilation path 38, the air flowing out from the outer peripheral portion along the substrate 12 of the impeller 10 flows to the protrusion 31 b. The air flows radially outward along the spiral air passage 36 or the connection air passage 38, so that the turbulence of the air flow on the connection air passage 38, the end side and the start end side of the spiral air passage 36 is suppressed. . Since the height of the protrusion 31b gradually decreases toward both ends, the protrusion 31b flows from the end of the spiral air passage 36 to the start end of the spiral air passage 36 via the connection air passage 38. The turbulence of the flowing air is suppressed. Further, an inclined surface 31c whose height decreases toward the radially outer side is provided on the radially outer side of the protruding portion 31b located on the terminal side of the spiral ventilation passage 36. For this reason, the air flowing along the protruding portion 31b flows along the inclined surface 31c and flows into the spiral ventilation passage 36, so that the turbulence of the air flowing into the end side of the spiral ventilation passage 36 is suppressed.

In the spiral ventilation passage 36, the dimension H of the impeller 10 in the rotation axis direction gradually increases from the start end side and the end side toward a predetermined position P between the start end and the end end in the spiral ventilation passage 36. It is formed small. Furthermore, the spiral ventilation path 36 is formed such that the radial dimension of the impeller 10 gradually increases in the direction in which the impeller 10 rotates. For this reason, in the circulating flow flowing along the first side plate 31 to the start end side of the spiral ventilation path 36, the dimension H of the spiral ventilation path 36 gradually decreases to a predetermined position P and the radial dimension gradually increases. This suppresses an increase in the flow velocity. The circulating flow circulating to the predetermined position P of the spiral ventilation passage 36 along the first side plate 31 has a dimension H of the spiral ventilation passage 36 gradually increasing from the predetermined position P toward the terminal side of the spiral ventilation passage 36 and the diameter thereof. By gradually increasing the dimension in the direction, the air flow is gradually decelerated and commutated, and the turbulence of the air flow is suppressed.

As described above, according to the blower 1 of the present embodiment, the first side plate 31 extends in the rotation direction of the impeller 10 from the start end side and the end side of the spiral ventilation path 36 and the terminal end of the spiral ventilation path 36 to rotate. The surface forming the connection ventilation passage 38 connected to the starting end of the passage 36 is formed by connecting an inclined surface having a gradually changing height, and the first side plate 31 has the starting end side of the spiral ventilation passage 36 and At the end side, radially inward of the surface forming the connection ventilation passage 38, the outer peripheral side of the impeller 10 is provided so as to extend along the circumferential direction of the impeller 10, and protrudes toward the second side plate 32. A protrusion 31b is provided.

Thereby, the circulating flow flowing from the end side to the starting end side of the spiral ventilation passage 36 through the connection ventilation passage 38 along the first side plate 31 is formed along the first side plate 31 without being separated from the first side plate 31. At the same time, the air flowing out of the outer periphery of the impeller 10 near the end side and the start end side of the spiral ventilation path 36 and near the connection ventilation path 38 is circulated along the projection 31b, and the spiral ventilation path 36 or the connection ventilation By causing the air to flow into the passage 38, the occurrence of turbulence in the air can be suppressed, so that the generation of sound can be suppressed and the silence can be improved.

Further, the dimension H of the impeller 10 in the spiral ventilation passage 36 in the rotation axis direction is from the start end and the end of the spiral ventilation passage 36 to a predetermined position P between the start end and the end of the spiral ventilation passage 36. It is formed gradually smaller.

Thereby, the circulating flow flowing from the end side to the starting end side of the spiral ventilation passage 36 through the connection ventilation passage 38 along the first side plate 31 is formed along the first side plate 31 without being separated from the first side plate 31. By circulating the circulating flow flowing along the first side plate 31 along the first side plate 31, the circulating flow flowing into the start end side of the spiral ventilation path 36 can be rectified, thereby suppressing the generation of sound. It is possible to improve the quietness.

The spiral ventilation path 36 is formed between the second flat plate 32 and the first flat plate 31 whose distance from the second flat plate 32 gradually changes.

This allows the second side plate 32 to have a simple shape, thereby reducing manufacturing costs.

Further, the predetermined position P between the start end side and the end side in the spiral ventilation passage 36 is about 90 to 150 degrees from the start end to the termination end of the spiral ventilation passage 36 about the rotation axis of the impeller 10. Within range.

This allows the circulating flow flowing along the first side plate 31 to the start end side of the spiral ventilation passage 36 to reliably flow along the first side plate 31.

突 The height of the protrusion 31b gradually decreases toward both ends.

Thereby, the turbulence of the air flowing from the end side of the spiral ventilation path 36 to the starting end side of the spiral ventilation path 36 via the connection ventilation path 38 by the projection 31b is suppressed.

In addition, the projection 31b is connected to the spiral ventilation passage 36 from the starting end of the spiral ventilation passage 36 at an angle of 180 degrees from the start end to the terminal end of the spiral ventilation passage 36 through the connection ventilation passage 38, and extends from the start end of the spiral ventilation passage 36 by 60 degrees. It is formed in the range up to the degree.

Thereby, the circulation flow flowing from the end side of the spiral ventilation passage 36 to the start end side, the flow of air flowing from the outer peripheral portion of the impeller 10 in the end side and the start end side of the spiral ventilation passage 36, and the connection ventilation passage 38, It is possible to effectively suppress the turbulence of the air flow in the portion where the turbulence of the air flow is likely to occur due to the merging.

傾斜 In addition, on the outer peripheral side of the protruding portion 31b, there is provided an inclined surface 31c whose height gradually decreases outward in the radial direction.

Thereby, it is possible to suppress the turbulence of the flow of the air flowing from the outer peripheral portion of the impeller 10 along the protrusion 31 b and flowing into the end side of the spiral ventilation passage 36 and the connection ventilation passage 38.

The inclined surface 31c is formed in a range from the end of the spiral ventilation passage 36 on the end side of the protruding portion 31b to the connection ventilation passage 38.

Thereby, the flow of the air is effectively suppressed at a portion where the air circulating from the outer peripheral portion of the impeller 10 along the protrusion 31 b and in which the turbulence of the air flowing into the end side of the spiral ventilation passage 36 and the connection ventilation passage 38 is likely to occur is easily generated. It becomes possible.

In addition, in the said embodiment, it is also possible to apply to the air-conditioning apparatus in the indoor of a building, and the air-blowing means, such as a ventilation apparatus, other than the air-blowing means of the vehicle air-conditioning apparatus.

In the above-described embodiment, the second side plate 32 is formed in a flat plate shape, and the spiral ventilation passage 36 and the connection ventilation passage 38 are formed by the first side plate 31 having a shape in which the distance from the second side plate 32 gradually changes. However, the present invention is not limited to this. For example, the first side plate may be formed in a flat plate shape, and the spiral ventilation path and the connection ventilation path may be formed by the second side plate having a shape in which the distance from the first side plate changes gradually. Alternatively, the spiral ventilation path and the connection ventilation path may be generated by gradually changing the height of both the first side plate and the second side plate in the direction of the rotation axis of the impeller.

Further, in the above-described embodiment, the surface of the first side plate 31 corresponding to the connection ventilation passage 38 is formed flush with the start end side of the spiral ventilation passage 36 and has the same height as the end portion of the spiral ventilation passage 36. The connection is shown, but the connection is not limited to this. It is sufficient that the surfaces of the first side plate 31 corresponding to the start and end sides of the spiral ventilation passage 36 and the connection ventilation passage 38 are connected by a smooth surface that does not generate a step, and only a flat surface having a constant height is used. Connection may be made, connection may be made only with a slope whose height gradually changes, or connection may be made with a flat face and a slope.

DESCRIPTION OF SYMBOLS 1 ... Blower, 10 ... Impeller, 30 ... Casing, 31 ... 1st side plate, 31b ... Projection, 31c ... Inclined surface, 32 ... 2nd side plate, 33 ... Peripheral plate, 34 ... Inlet, 36 ... Spiral ventilation path , 38 ... connecting ventilation path.

Claims

A cylindrical impeller,
A casing in which an impeller is housed therein, and a spiral ventilation path is formed radially outside the impeller housed therein;
The casing is provided on a first side plate provided on one end side in the rotation axis direction of the impeller, a second side plate provided on the other end side in the rotation axis direction and having an air intake port, and provided on a radially outer side of the impeller. Having an outer peripheral plate,
In the first side plate and the second side plate, a connection ventilation passage extending in the rotation direction of the impeller from the start end and the end side of the spiral ventilation passage and the terminal end of the spiral ventilation passage and connected to the start end of the spiral ventilation passage is formed. The surface is formed by connecting one or both of a flat surface with a constant height and a sloping surface with a gradually changing height,
The first side plate is provided so as to extend along the outer peripheral side of the impeller along the circumferential direction of the impeller, on the radially inner side of the surface forming the connection ventilation path, at the start end side and the end side of the spiral ventilation path. A blower provided with a protrusion protruding toward the second side plate.
The size of the impeller in the spiral ventilation path in the direction of the rotation axis is gradually reduced from the start and end of the spiral ventilation path to a predetermined position between the start and end of the spiral ventilation path. Item 7. The blower according to Item 1.
The blower according to claim 2, wherein the spiral ventilation path is formed between a flat second side plate and a first side plate whose distance from the second side plate changes gradually.
The predetermined position between the start end side and the end side in the spiral ventilation passage is within a range of 90 degrees to 150 degrees from the start end to the end part of the spiral ventilation passage around the rotation axis of the impeller. 3. The blower according to 3.
The blower according to any one of claims 1 to 4, wherein the height of the protrusion is gradually reduced toward each of both ends.
The protrusion is formed within a range from the position of 180 degrees from the start end of the spiral air passage to the terminal end thereof through the connection air passage from the start end of the spiral air passage to 60 degrees from the start end of the spiral air passage around the rotation axis of the impeller. The blower according to any one of claims 1 to 5.
The blower according to any one of claims 1 to 6, wherein an inclined surface whose height gradually decreases radially outward is provided on an outer peripheral side of the protrusion.
The blower according to claim 7, wherein the inclined surface is formed in a range from an end on the end side of the spiral ventilation path in the protrusion to a connection ventilation path.