WO2020012866A1 - Centrifugal blower - Google Patents

Abstract

A centrifugal fan (12) that comprises a plurality of blades (121) and a separation plate (13) takes in air from one side in the axial direction (Dra) of the fan axis. An intake port (14a) and a blown air passage (142a) are formed in a fan casing (14), and the fan casing comprises a partition plate (15) that partitions the blown air passage into a first air passage (142b) and a second air passage (142c). A separation cylinder (18) is arranged on the radially inward side of the centrifugal fan with respect to the plurality of blades. Air passing through the intake port is separated into inner air flowing on the radially inward side with respect to the separation cylinder and outer air flowing on the radially outward side with respect to the separation cylinder. The partition plate is arranged so that the outer air flows into the first air passage from the centrifugal fan and the inner air flows into the second air passage. The separation cylinder expands in the radial direction as proximity to the other side in the axial direction increases. At a position on the end on the other side in the axial direction, the separation cylinder has a shape that expands toward the radially outward side in an inclined manner with respect to the axial direction.

Description

Centrifugal blower Cross-reference to related application

This application is based on Japanese Patent Application No. 2018-132470 filed on Jul. 12, 2018 and Japanese Patent Application No. 2019-20906 filed on Feb. 7, 2019. The description is incorporated by reference.

The present disclosure relates to a centrifugal blower.

Patent Literature 1 describes a centrifugal blower applied to a vehicle air conditioner of a two-layer flow of inside / outside air. This centrifugal blower can separate two air streams and simultaneously inhale them from one side. This centrifugal blower includes a centrifugal fan that has a plurality of blades and rotates about a fan axis, and a separation tube that is arranged radially inside the centrifugal fan with respect to the plurality of blades.
The separation cylinder has a substantially cylindrical shape centered on the axis of the fan, and divides an air passage from the suction port of the scroll casing to the centrifugal fan into two air passages. The separation cylinder has a shape that expands in the radial direction of the centrifugal fan from the suction port side toward the centrifugal fan side in the axial direction of the fan axis. Further, at the position of the end on the centrifugal fan side, the separation tube has a shape extending perpendicularly to the fan axis and radially outward.

JP 2004-132342 A

In the centrifugal blower of Patent Literature 1, the air flow from the suction port to the centrifugal fan is directed from the axial direction to the radially outward direction along the curved shape of the separation tube, and then, between the blades of the centrifugal fan. Sucked into. As described above, since the direction of the air flow is forcibly changed by the separation tube, a pressure loss occurs in the air flow along the separation tube near the end of the separation tube on the centrifugal fan side. As a result of detailed studies by the inventors, the above has been found.

In view of the above, it is an object of the present disclosure to provide a centrifugal blower that can reduce a pressure loss generated in an air flow by a separation tube.

To achieve the above object, according to one aspect of the present disclosure, a centrifugal blower includes:
A centrifugal fan that has a plurality of blades arranged around the fan axis, and a separation plate, and blows air taken in from one axial side of the fan axis toward the outside in the radial direction,
The centrifugal fan is accommodated, and the air blown out of the centrifugal fan is provided on the radially outer side of the centrifugal fan and the suction port through which the air sucked into the centrifugal fan is disposed on one side in the axial direction with respect to the centrifugal fan. A fan casing having a partition plate defining a flowing air passage, and dividing the blown air passage into a first air passage and a second air passage disposed on the other side in the axial direction with respect to the first air passage; ,
A radially inner side of the centrifugal fan with respect to a plurality of blades, comprising a cylindrical separation tube oriented in the axial direction,
The separation cylinder separates air passing through the suction port into inner air flowing in the radial direction with respect to the separation cylinder and outer air flowing in the radial direction with respect to the separation cylinder.
The separation plate has a plate shape that expands in the radial direction, and between the plurality of blades, outside air flows on one side in the axial direction with respect to the separation plate, and inside air flows on the other side in the axial direction with respect to the separation plate. Arranged to flow,
The partition plate is arranged so that outside air flows into the first air passage from the centrifugal fan and inside air flows into the second air passage,
The separation tube extends in the radial direction toward the other side in the axial direction, and at the other end position of the separation tube, which is the position of the other end in the axial direction, the outer side in the radial direction is oblique to the axial direction. It has a shape that expands facing.

With this configuration, for example, compared to the case where the separation tube has a shape that is orthogonal to the axial direction and expands outward in the radial direction at the other end position of the separation tube, the air flow along the separation tube is The orientation can be gently changed to be between the blades. For this reason, it is possible to reduce the pressure loss caused by bending the air flow along the separation tube without having to increase the outer diameter of the separation tube.

Note that reference numerals in parentheses attached to the respective components and the like indicate an example of the correspondence between the components and the like and specific components and the like described in the embodiments described later.

It is the figure which showed the schematic structure of the centrifugal blower in 1st Embodiment, Comprising: It is sectional drawing which cut | disconnected the centrifugal blower by the plane containing the fan axis of a centrifugal blower. FIG. 2 is a partially enlarged view showing a portion II of FIG. 1 in an enlarged manner. FIG. 4A is a cross-sectional view schematically illustrating a first comparative example compared with the first embodiment, and FIG. 4B schematically illustrates a second comparative example compared with the first embodiment. It is a longitudinal section showing the schematic structure of the centrifugal blower of the 3rd comparative example, and is a figure corresponding to Drawing 1. It is the figure which showed typically the separation cylinder, the separation plate, and the partition plate in the longitudinal cross-sectional view of the centrifugal blower of a 4th comparative example. It is the figure which showed typically the separation cylinder, the separation plate, and the partition plate in the longitudinal cross-sectional view of the centrifugal blower of 2nd Embodiment. FIG. 7 is a diagram schematically showing a separation cylinder, a separation plate, and a partition plate in a vertical cross-sectional view of a centrifugal blower according to a third embodiment, and is a diagram corresponding to FIG. It is the figure which showed typically the separation cylinder, the separation plate, and the partition plate in the longitudinal cross-sectional view of the centrifugal blower of 4th Embodiment, and is a figure corresponding to FIG. It is the figure which showed typically the separation cylinder, the separation plate, and the partition plate in the longitudinal cross-sectional view of the centrifugal blower of 5th Embodiment, and is a figure corresponding to FIG. It is the figure which showed typically the separation cylinder, the separation plate, and the partition plate in the longitudinal cross-sectional view of the centrifugal blower of 6th Embodiment, and is a figure corresponding to FIG. It is the figure which showed typically the separation cylinder, the separation plate, and the partition plate in the longitudinal cross-sectional view of the centrifugal blower of 7th Embodiment, and is a figure corresponding to FIG. It is the figure which showed typically the separation cylinder, the separation plate, and the partition plate in the longitudinal cross-sectional view of the centrifugal blower of 8th Embodiment, and is a figure corresponding to FIG. It is a longitudinal section showing the schematic structure of the centrifugal blower of a 9th embodiment, and is a figure corresponding to Drawing 1. It is a longitudinal section showing the schematic structure of the centrifugal blower of a 10th embodiment, and is a figure corresponding to Drawing 1. It is a longitudinal section showing the schematic structure of the centrifugal blower of an 11th embodiment. It is the elements on larger scale which expanded and showed the XVI part of FIG.

Hereinafter, each embodiment will be described with reference to the drawings. In the following embodiments, portions that are the same or equivalent are denoted by the same reference numerals in the drawings.

(1st Embodiment)
The centrifugal blower 10 of the present embodiment shown in FIG. 1 is applied to a vehicle air conditioner of a two-layer flow of inside / outside air. This vehicle air conditioner can separate and inhale vehicle interior air (ie, inside air) and vehicle exterior air (ie, outside air) at the same time. In the following description, the centrifugal blower 10 will be simply referred to as the blower 10.

As shown in FIG. 1, the blower 10 includes a centrifugal fan 12, a fan casing 14, a motor 16, and a separation tube 18. The centrifugal fan 12 rotates about the fan axis CL. As the centrifugal fan 12 rotates, the centrifugal fan 12 blows out air taken in from one side of the fan shaft CL in the axial direction DRa toward the outside of the radial direction DRr of the centrifugal fan 12. FIG. 1 shows a vertical section obtained by cutting the centrifugal fan 12, the fan casing 14, and the separation tube 18 in a plane including the fan axis CL, that is, a vertical section obtained by cutting the blower 10 in a plane including the fan axis CL. I have. In the following description, this vertical cross section is referred to as the vertical cross section of the blower 10 or the vertical cross section of FIG.

In the present embodiment, the axial direction DRa of the fan axis CL, that is, the axial direction DRa of the centrifugal fan 12, is referred to as a fan axial direction DRa. The radial direction DRr of the fan axis CL, that is, the radial direction DRr of the centrifugal fan 12 is referred to as a fan radial direction DRr. The fan radial direction DRr is a direction perpendicular to the fan axis direction DRa.

The centrifugal fan 12 has a plurality of blades 121, a main plate 122, a reinforcing member 123, and a separation plate 13. The plurality of blades 121 are arranged side by side around the fan axis CL. Each of the plurality of blades 121 has one end 121a which is one end in the fan axis direction DRa, and the other end 121b which is the other end in the fan axis direction DRa.

The main plate 122 has a plate shape that expands in the fan radial direction DRr. In short, the main plate 122 has a disk shape centered on the fan axis CL. The main plate 122 is arranged on the other side of the separation cylinder 18 in the fan axis direction DRa. A rotation shaft 161 of the motor 16 is connected to a center portion of the main plate 122 so as to be relatively non-rotatable. The other ends 121b of the blades 121 are fixed to a portion of the main plate 122 outside the fan radial direction DRr.

The main plate 122 has a main plate guide surface 122a on one side in the fan axis direction DRa. The main plate guide surface 122a extends in the fan radial direction DRr toward one side in the fan axial direction DRa.

The reinforcing member 123 reinforces the centrifugal fan 12. The reinforcing member 123 has an annular shape centered on the fan axis CL. The reinforcing member 123 is fixed to one end 121a side and a radially outer portion of each of the plurality of blades 121.

The separation plate 13 separates air flowing between the plurality of blades 121 into air flowing on one side of the separation plate 13 in the fan axis direction DRa and air flowing on the other side of the separation plate 13 in the fan axis direction DRa. I do.

Specifically, the separation plate 13 intersects with each of the plurality of blades 121 and extends annularly around the fan axis CL. The separation plate 13 has a plate shape that extends in the fan radial direction DRr. Each of the plurality of blades 121 and the separation plate 13 are fixed to each other at a portion where the blade 121 and the separation plate 13 intersect. In the present embodiment, the plurality of blades 121, the main plate 122, the reinforcing member 123, and the separation plate 13 are configured as an integrally molded product integrally formed of resin.

As shown in FIGS. 1 and 2, the separation plate 13 has a separation plate outer end 131 provided outside the fan radial direction DRr and a separation plate inner end 132 provided inside the fan radial direction DRr. are doing. The separation plate outer end 131 has an outer end surface 131a facing outward in the fan radial direction DRr. The outer end surface 131a is a ring-shaped end surface extending from one side to the other side in the fan axial direction DRa at the position of the outer end of the separation plate 13 in the fan radial direction DRr.

分離 The separation plate inner end 132 has an inner end surface 132a facing inward in the fan radial direction DRr. The inner end face 132a is a ring-shaped end face extending from one side to the other side in the fan axial direction DRa at the position of the inner end of the separation plate 13 in the fan radial direction DRr.

分離 The separation plate inner end 132 is located on one side of the separation plate outer end 131 in the fan axis direction DRa. Specifically, the separation plate 13 continuously extends so that the outer side in the fan radial direction DRr is located on the other side in the fan axial direction DRa. Further, in the longitudinal section of FIG. 1, the separation plate 13 is inclined with respect to the fan axis CL, and linearly extends from the separation plate inner end 132 to the separation plate outer end 131.

In the present embodiment, of the blades 121, the blade profile of the blade one-side portion 121c, which is a portion of the blade 121 on one side in the fan axis direction DRa, is a sirocco fan blade profile. Similarly, the airfoil of the blade 121 on the other side of the blade 121 in the fan axis direction DRa with respect to the separation plate 13 is also the sirocco fan airfoil.

(4) The fan casing 14 functions as a housing that forms the outer shell of the blower 10, and houses the centrifugal fan 12 inside the fan casing 14. The fan casing 14 has a suction port 14 a through which the air sucked into the centrifugal fan 12 passes. The suction port 14a is disposed on one side of the centrifugal fan 12 in the fan axis direction DRa.

The fan casing 14 has a bell mouth 141 that forms a peripheral portion of the suction port 14a. The cross-sectional shape of the bell mouth 141 is arc-shaped so that air flows smoothly through the suction port 14a.

フ ァ ン Fan casing 14 has air passage forming portion 142 and partition plate 15. In the air passage forming portion 142, a blow air passage 142a provided outside the centrifugal fan 12 in the fan radial direction DRr is formed. The air blown from the centrifugal fan 12 gathers and flows through the blown air passage 142a. For example, the outlet air passage 142a is formed in a spiral shape around the centrifugal fan 12. The fan casing 14 is also called a scroll casing.

The air passage forming portion 142 has an outer peripheral wall 143 extending in the fan axis direction DRa around the centrifugal fan 12. The outer peripheral wall 143 faces the outlet air passage 142a from the outside in the fan radial direction DRr.

The partition plate 15 is provided inside the blow-off air passage 142a. The partition plate 15 includes a first air passage 142b arranged on one side of the partition plate 15 in the fan axis direction DRa, and a second air passage 142c arranged on the other side of the partition plate 15 in the fan axis direction DRa. The outlet air passage 142a is partitioned.

The partition plate 15 has a plate shape extending in the fan radial direction DRr. The partition plate 15 has a partition plate outer end 151 provided outside the fan radial direction DRr and a partition plate inner end 152 provided inside the fan radial direction DRr. The outer edge 151 of the partition plate is connected to the outer peripheral wall 143. That is, the partition plate 15 extends from the outer peripheral wall 143 toward the centrifugal fan 12 with the partition plate outer end 151 as a base end. In the present embodiment, the air passage forming portion 142 and the partition plate 15 are configured as an integrally molded product formed integrally with the resin. The thickness of the partition plate 15, the thickness of the separation plate 13, and the thickness of the separation tube 18 are, for example, the same or substantially the same.

内側 The partition plate inner end 152 has a partition plate end surface 152a facing inward in the fan radial direction DRr. The partition plate end surface 152a is a ring-shaped end surface extending from one side to the other side in the fan axial direction DRa at a position inside the partition plate 15 in the fan radial direction DRr.

Further, the partition plate 15 has a partition plate outer portion 153 and a partition plate inner portion 154 disposed inside the fan radial direction DRr with respect to the partition plate outer portion 153 and connected in series to the partition plate outer portion 153. ing. The partition outer portion 153 includes a partition outer end 151, and the partition inner portion 154 includes a partition inner end 152.

外側 The partition plate outer portion 153 has a shape that expands in the fan radial direction DRr without being displaced in the fan axial direction DRa. That is, the partition plate outer portion 153 has a shape expanding in a direction orthogonal to the fan axis direction DRa. In other words, the partition plate outer portion 153 has a shape that expands in a direction orthogonal to the fan axis direction DRa. Therefore, at the position of the partition plate outer end 151, the partition plate 15 has a shape that extends along a direction orthogonal to the fan axis direction DRa.

On the other hand, the partition plate inner portion 154 extends so that the outer side in the fan radial direction DRr is located on the other side in the fan axial direction DRa. Further, in the vertical section of FIG. 1, the partition plate inner portion 154 extends straight and inclined with respect to the fan axis CL. Therefore, the partition plate inner portion 154 is connected to the partition plate outer portion 153 so as to be bent at the boundary between the partition plate inner portion 154 and the partition plate outer portion 153.

That is, in the vertical cross section of FIG. 1, as the partition plate 15 extends outward from the partition plate inner end 152 in the fan radial direction DRr, the angle formed by the partition plate 15 with respect to the fan axis CL is orthogonal to the fan axis CL. It is formed so as to approach the angle gradually.

The portion of the partition plate inner portion 154 excluding the partition plate inner end 152 and the partition plate outer portion 153 are located on the other side of the partition plate inner end 152 in the fan axis direction DRa. More specifically, the partition plate outer portion 153 is a portion of the partition plate 15 located on the other side in the fan axis direction DRa. The partition plate outer end 151 is located on the other side of the partition plate inner end 152 in the fan axis direction DRa.

In the vertical cross section of FIG. 1, the inclination angle of the partition plate inner portion 154 with respect to the fan axis CL is the same as the inclination angle of the separation plate 13.

The motor 16 is an electric driving device for rotating the centrifugal fan 12. The motor 16 has a rotating shaft 161 and a main body 162. The rotation shaft 161 extends from the main body 162 toward one side in the fan axis direction DRa. The rotation of the rotation shaft 161 causes the centrifugal fan 12 to rotate. The main body 162 is fixed to the fan casing 14. The main body 162, the fan casing 14, and the separation cylinder 18 are non-rotating members that do not rotate.

The separation cylinder 18 is a cylindrical member extending in the fan axis direction DRa. In short, the separation cylinder 18 has a cylindrical shape facing the fan axis direction DRa. The separation cylinder 18 has a cylindrical shape that is open at one end and the other end in the fan axis direction DRa. The separation tube 18 is disposed inside the bell mouth 141 and the plurality of blades 121 of the centrifugal fan 12 in the fan radial direction DRr. The separation cylinder 18 is arranged such that a part of the separation cylinder 18 is inserted into the fan casing 14 through the suction port 14a. The separation cylinder 18 is fixed to, for example, the fan casing 14.

に よ り With such a shape and arrangement, the separation tube 18 separates the air flow from the suction port 14a toward the centrifugal fan 12 into two air flows. The separation tube 18 partitions the air passage from the suction port 14a to the centrifugal fan 12 into two air passages. That is, the separation tube 18 separates the air passing through the suction port 14 a into the inside air flowing inside the fan radial direction DRr with respect to the separation tube 18 and the outside air flowing outside the fan diameter direction DRr with respect to the separation tube 18. In FIG. 1, the flow of the outside air is represented by an arrow Fo, and the flow of the inside air is represented by an arrow Fi.

The separation cylinder 18 has a shape that expands in the fan radial direction DRr toward the other side in the fan axial direction DRa in order to guide the inside air and the outside air between the blades 121. That is, on the other side of the separation tube 18 in the fan axis direction DRa, the diameter of the separation tube 18 increases from one side in the fan axis direction DRa toward the other end.

Specifically, the separation cylinder 18 has one side portion 183 and the other side portion 184 disposed on the other side of the one side portion 183 in the fan axis direction DRa and connected in series to the one side portion 183. I have. The one side portion 183 extends along the fan axis direction DRa without changing the diameter of the separation tube 18.

On the other hand, the other side portion 184 of the separation tube 18 extends from one side in the fan axial direction DRa to the other side while bending so as to expand outward in the fan radial direction DRr. At the other end position PTa of the separation tube 18 at the other end of the separation tube 18 in the fan axis direction DRa, the separation tube 18 expands outward in the fan radial direction DRr with respect to the fan axis direction DRa. It has a shaped shape. The other end PTa of the separation tube is also the position of the other end of the other portion 184 in the fan axis direction DRa.

分離 The separation cylinder 18 has a separation cylinder other end 185 provided on the other side in the fan axis direction DRa. The other end 185 of the separation tube is included in the other side portion 184 of the separation tube 18 and is also a radially outer end of the separation tube 18 provided outside the fan radial direction DRr.

The other end 185 of the separation tube has a separation tube end surface 185a facing outward in the fan radial direction DRr. The separation tube end surface 185a is a ring-shaped end surface extending from one side in the fan axis direction DRa to the other side at the separation tube other end position PTa.

Further, since the separation cylinder 18 is cylindrical as described above, the separation cylinder outer surface 181 configured as the cylindrical outer wall surface and the separation cylinder inner surface 182 configured as the cylindrical inner wall surface are formed. have. Both the outer surface 181 of the separation cylinder and the inner surface 182 of the separation cylinder are formed from one side portion 183 to the other side portion 184.

The separation cylinder outer surface 181 extends to the separation cylinder other end position PTa including the outward surface 181a facing outward in the fan radial direction DRr. In other words, the outer surface 181 of the separation cylinder extends to the other end 185 of the separation cylinder including the outward surface 181a. The outward surface 181a is an outer wall surface of one side portion 183 of the separation cylinder 18, and extends in the fan axis direction DRa along the fan axis CL.

The inner surface 182 of the separation cylinder extends to the other end position PTa of the separation cylinder including the inward surface 182a facing inward in the fan radial direction DRr. In other words, the inner surface 182 of the separation cylinder extends to the other end 185 of the separation cylinder including the inward surface 182a. The inward surface 182a is an inner wall surface of one side portion 183 of the separation tube 18, and extends in the fan axis direction DRa along the fan axis CL.

The main plate guide surface 122a guides the inside air such that the inside air flows outward in the fan radial direction DRr on the upstream side of the air flow to the plurality of blades 121, as indicated by the arrow Fi. Then, in the vertical cross section of FIG. 1, when the intersection Pn at which the normal Ln of the inner surface 182 of the separation cylinder at the other end position PTa of the separation cylinder intersects with the main plate guide surface 122a is obtained as the main plate guide surface intersection Pn, You can say something like this. That is, in the longitudinal section of FIG. 1, the tangential direction D1t of the inner surface 182 of the separation cylinder obtained at the other end position PTa of the separation tube is the same as the tangential direction D2t of the main plate guide surface 122a obtained at the intersection Pn of the main plate guide surface. ing. More specifically, the tangential direction D1t of the inner surface 182 of the separation cylinder is parallel to the tangential direction D2t of the main plate guide surface 122a.

As shown in FIG. 1, the separation plate 13 separates the flow of the outside air indicated by the arrow Fo from the flow of the inside air indicated by the arrow Fi in the fan axial direction DRa on the downstream side of the air flow with respect to the separation cylinder 18. It is arranged to be. That is, between the plurality of blades 121, the outside air flows as shown by an arrow Fo on one side in the fan axis direction DRa with respect to the separation plate 13 between the plurality of blades 121 and the arrow on the other side in the fan axis direction DRa with respect to the separation plate 13. It is arranged so that the inside air flows like Fi.

Then, the partition plate 15 is arranged so as to separate the flow of the outside air indicated by the arrow Fo from the flow of the inside air indicated by the arrow Fi on the downstream side of the air flow to the centrifugal fan 12 in the fan axial direction DRa. ing. That is, the partition plate 15 is arranged such that the outside air flows from the centrifugal fan 12 into the first air passage 142b as shown by the arrow Fo, and the inside air flows into the second air passage 142c as shown by the arrow Fi.

In short, the separation plate 13 and the partition plate 15 are respectively arranged so as to suppress the outside air and the inside air from being mixed on the downstream side of the air flow with respect to the separation cylinder 18.

As shown in FIG. 1, there are gaps between the separation plate 13 and the separation tube 18 and between the separation plate 13 and the partition plate 15 to allow relative rotation. Therefore, the following can be said in detail. That is, between the plurality of blades 121, the outside air flows on one side in the fan axis direction DRa with respect to the separation plate 13 by far more than the inside air, and the other side in the fan axis direction DRa with respect to the separation plate 13 , The inside air flows much more than the outside air. Then, the outside air flows from the centrifugal fan 12 into the first air passage 142b much more than the inside air, and the inside air flows into the second air passage 142c much more than the outside air.

In order to separate the outside air and the inside air as described above, specifically, as shown in FIG. 2, the other end 132 b of the inside end surface 132 a of the separation plate 13 in the fan axial direction DRa is It is located on the other side than one end 185b of the separation cylinder end surface 185a.

More specifically, in the vertical section of the blower 10, when linearly complementing so as to connect between the other end 185 of the separation tube and the inner end 132 of the separation plate, the separation plate 13 continues from the separation tube 18. It is arranged to be connected. The “continuous connection” means not only that there is no step and no bending, but also that the separation is performed to the extent that a small step or a small bend occurs compared to the plate thickness of the separation plate 13 and the separation tube 18. The plate 13 and the separation tube 18 may be connected. The same is true for the “continuous connection” between the separation plate 13 and the partition plate 15 described later.

In the fan axial direction DRa, one end 131b of the outer end surface 131a of the separation plate 13 is located on one side of the other end 152b of the partition plate end surface 152a. More specifically, in the longitudinal section of the blower 10, when the linear plate is complemented linearly so as to connect between the outer end 131 of the separator and the inner end 152 of the separator, the separator 13 is continuously connected to the separator 15. It is arranged to be connected.

In the blower 10 of the present embodiment configured as described above, when the centrifugal fan 12 is rotated by the motor 16, air is sucked into the fan radial direction DRr of the centrifugal fan 12 from one side in the axial direction DRa of the centrifugal fan 12. I will. The sucked air is blown from the centrifugal fan 12 to the outside in the fan radial direction DRr. The air blown from the centrifugal fan 12 flows through the blow air passage 142 a of the fan casing 14 and is blown from the outlet of the fan casing 14.

At this time, as shown in FIG. 1, inside the blower 10, the outside air represented by the arrow Fo and the inside air represented by the arrow Fi are separated by the separation tube 18, the separation plate 13, and the partition plate 15. Flow in state.

空 気 The air blown out from the blower 10 flows through an air conditioning casing of a vehicle air conditioner (not shown). A temperature controller for adjusting the air temperature is disposed inside the air-conditioning casing. The air blown from the blower 10 is blown into the vehicle compartment after the temperature is adjusted by the temperature adjuster. Even inside the air conditioning casing, the state where the flow of the outside air and the flow of the inside air are separated is maintained. Then, after the two air flows are temperature-adjusted, for example, the two air flows are blown into the vehicle interior from different outlets.

As described above, according to the present embodiment, as shown in FIG. 1, the separation cylinder 18 expands in the fan radial direction DRr toward the other side in the fan axial direction DRa. At the other end position PTa of the separation tube 18 of the separation tube 18, the separation tube 18 has a shape that extends outward in the oblique fan radial direction DRr with respect to the fan axial direction DRa.

Therefore, it is possible to increase the radius of curvature Rc of the other side portion 184 of the separation cylinder 18 whose diameter increases in comparison with the blower 91 of the first comparative example shown in FIG. That is, in comparison with the blower 91 of the first comparative example, the direction of the air flow along the separation tube 18 can be gently changed so as to be directed between the blades 121. Therefore, in the present embodiment, it is possible to reduce the pressure loss caused by bending the air flow along the separation tube 18 without having to increase the outer edge diameter Dcr of the separation tube 18.

Here, like the blower 92 of the second comparative example shown in FIG. 3B, the outer edge diameter Dcr is enlarged as shown by an arrow Acr with respect to the blower 91 of the first comparative example, so that the other side portion 184 is formed. Can be increased. However, if it does so, the physique of the blower 92 will expand. On the other hand, the separation tube 18 of the present embodiment shown in FIG. 1 has a shape that expands outward at an oblique fan radial direction DRr with respect to the fan axial direction DRa at the separation tube other end position PTa of the separation tube 18. Has formed. Therefore, it is possible to increase the radius of curvature Rc of the other side portion 184 without increasing the outer edge diameter Dcr of the separation cylinder 18.

As shown in FIGS. 3A and 3B, each of the separation tubes 18 of the blowers 91 and 92 of the first and second comparative examples has the other end position PTa of the separation tube 18 of the separation tube 18 (FIG. 1). ), The shape is perpendicular to the fan axis direction DRa and extends outward in the fan radial direction DRr. 3A and 3B, only one side of the vertical cross section of the blowers 91 and 92 with respect to the fan axis CL is excerpted, and this is the same as FIG. But it is the same.

According to the present embodiment, as shown in FIGS. 1 and 2, the separation plate inner end 132 of the separation plate 13 is located on one side in the fan axis direction DRa with respect to the separation plate outer end 131. . Therefore, it is possible to reduce the pressure loss caused by the outside air having the velocity component flowing along the separation cylinder outer surface 181 and having the velocity component directed to the other side in the fan axial direction DRa colliding with the separation plate 13.

Further, according to the present embodiment, the partition plate 15 has the partition plate outer portion 153, and the partition plate outer portion 153 is included in a portion located on the other side in the fan axis direction DRa with respect to the partition plate inner end 152. It is.

Therefore, the air blown out from between the plurality of blades 121 has a velocity component directed to the other side in the fan axis direction DRa around the partition plate inner end 152 and the fan diameter direction DRr oblique to the fan axis direction DRa. It is hard to block the flow toward the outside. Therefore, it is possible to reduce the pressure loss caused by the outside air blown from between the blades 121 colliding with the partition plate 15.

According to the present embodiment, the fan casing 14 has the outer peripheral wall 143 facing the outlet air passage 142a from the outside in the fan radial direction DRr. Further, the partition plate 15 has a partition plate outer end 151 provided outside the fan radial direction DRr and connected to the outer peripheral wall 143. Furthermore, at the position of the partition plate outer end 151, the partition plate 15 has a shape that extends along a direction orthogonal to the fan axis direction DRa.

Accordingly, as shown in FIG. 4, the third comparative example has a shape in which the partition plate 15 extends outward in the fan radial direction DRr while facing the other side in the oblique fan axial direction DRa at the position of the partition plate outer end 151 as shown in FIG. The following can be said as compared with the blower 93. That is, in the present embodiment, as compared with the blower 93 of the third comparative example in FIG. 4, the direction of the outside air reaching the outer peripheral wall 143 of the fan casing 14 along the partition plate 15 is, for example, the arrow Fr in FIG. Such a sudden change as described above can be suppressed. As a result, the output of the blower 10 can be improved.

According to the present embodiment, as shown in FIGS. 1 and 2, in the vertical cross section of the blower 10, the partition plate inner portion 154 includes the partition plate inner end 152, and the outer side in the fan radial direction DRr increases in the fan axial direction. It extends linearly and is inclined so as to be located on the other side of DRa. On the other hand, the partition plate outer portion 153 has a shape expanding in a direction orthogonal to the fan axis direction DRa. That is, in the vertical cross section of the blower 10, the angle formed by the partition plate 15 with respect to the fan axis CL is perpendicular to the fan axis CL as the partition plate 15 moves outward from the partition plate inner end 152 in the fan radial direction DRr. It is formed so as to gradually approach the angle.

Therefore, it is possible to gradually change the direction of the air flowing along the partition plate 15 so as to approach a direction perpendicular to the fan axis and facing outward in the fan radial direction DRr. As a result, for example, it is possible to reduce the pressure loss caused by the outside air blown out from the centrifugal fan 12 as shown by the arrow Fo colliding with the partition plate 15.

According to the present embodiment, as shown in FIG. 2, in the fan axial direction DRa, the other end 132b of the inner end surface 132a of the separation plate 13 is closer to the one end 185b of the separation cylinder end surface 185a. Is also located on the other side. Therefore, compared to the case where the other end 132b of the inner end face 132a is located on one side of the one end 185b of the separation cylinder end face 185a, the two air flows separated by the separation cylinder 18 are separated. Mixing through the gap between the cylinder 18 and the separation plate 13 is suppressed.

Further, according to the present embodiment, as shown in FIG. 2, in the fan axial direction DRa, one end 131 b of the outer end surface 131 a of the separation plate 13 is higher than the other end 152 b of the partition plate end surface 152 a. Is also located on one side. Therefore, compared to the case where one end 131b of the outer end surface 131a is located on the other side of the other end 152b of the partition plate end surface 152a, the two air flows separated by the separation plate 13 are separated. Mixing through the gap between the plate 15 and the separation plate 13 is suppressed.

Further, according to the present embodiment, in the longitudinal section of FIG. 1, the intersection Pn at which the normal Ln of the inner surface 182 of the separation cylinder at the other end position PTa of the separation cylinder intersects with the main plate guide surface 122a is defined as the main plate guide surface intersection Pn. can get. In this case, in the vertical cross section of FIG. 1, the tangential direction D1t of the separation cylinder inner side surface 182 obtained at the separation cylinder other end position PTa is the same as the tangential direction D2t of the main plate guide surface 122a obtained at the main plate guide surface intersection Pn. Has become.

Here, in the flow path formed between the inner surface 182 of the separation cylinder and the main plate guide surface 122a and through which the inner air flows, the circumferential length of the flow path cross section centered on the fan axis CL becomes longer toward the downstream side. The change in the circumferential length acts to increase the flow path cross-sectional area toward the downstream side. If it is assumed that the tangential direction D1t of the inner surface 182 of the separation cylinder is closer to the direction orthogonal to the fan axis than the tangential direction D2t of the main plate guide surface 122a, the vertical cross section in FIG. The change in the height of the cross section of the flow channel that appears increases the expansion of the cross sectional area of the flow channel.

On the other hand, in the present embodiment, a change in the height of the cross section of the flow channel shown in the vertical cross section of FIG. 1 does not easily promote an increase in the cross sectional area of the flow channel. Therefore, the rate of change of the flow path cross-sectional area of the flow path through which the inside air flows can be reduced as compared with the above assumed case.

FIG. 5 shows a blower 94 of a fourth comparative example to be compared with the present embodiment. In the blower 94 of the fourth comparative example, the position in the fan axial direction DRa matches between the other end 185 of the separation tube and the inner end 132 of the separation plate, and the position between the inner end 152 of the partition plate and the outer end 131 of the separation plate. There is also agreement between.

On the other hand, according to the present embodiment, as shown in FIGS. 1 and 2, the position of the inner end 132 of the separation plate is different from the position of the other end 185 of the separation tube as compared with the fourth comparative example. It is shifted to the other side in the fan axis direction DRa. Then, in the vertical cross section of the blower 10, when linearly complementing so as to connect between the other end 185 of the separation tube and the inner end 132 of the separation plate, the separation plate 13 is connected continuously from the separation tube 18. Are located.

Therefore, compared to the fourth comparative example in FIG. 5, in the present embodiment, the outer air and the inner air flowing along the separation cylinder 18 can flow more smoothly along the separation plate 13. Then, the size of the gap between the separation cylinder 18 and the separation plate 13 in the direction orthogonal to the flow of the outside air and the inside air indicated by arrows Fo and Fi in FIG. Specifically, it can be set to zero. Therefore, for example, compared to the above-described fourth comparative example, it is possible to improve the separation property of flowing the outside air and the inside air while separating them.

According to the present embodiment, as shown in FIGS. 1 and 2, the position of the partition plate inner end 152 is different from the position of the separation plate outer end 131 by the fan shaft as compared with the fourth comparative example. It is shifted to the other side in the direction DRa. Then, in the vertical cross section of the blower 10, when linearly complementing so as to connect between the separation plate outer end 131 and the partition plate inner end 152, the separation plate 13 is connected continuously from the partition plate 15. Are located.

Therefore, in the present embodiment, the outer air and the inner air flowing along the separation plate 13 can flow more smoothly along the partition plate 15 than the fourth comparative example in FIG. Then, the size of the gap between the partition plate 15 and the separation plate 13 in the direction orthogonal to the flow of the outside air and the inside air indicated by arrows Fo and Fi in FIG. Specifically, it can be set to zero. Therefore, for example, compared to the above-described fourth comparative example, it is possible to improve the separation property of flowing the outside air and the inside air while separating them.

(2nd Embodiment)
Next, a second embodiment will be described. In this embodiment, points different from the first embodiment will be mainly described. Also, the same or equivalent parts as those of the above-described embodiment will be omitted or simplified. This is the same in the following description of the embodiment.

As shown in FIG. 6, in the present embodiment, the relative positional relationship between the separation tube 18, the separation plate 13, and the partition plate 15 in the fan axial direction DRa is different from that of the first embodiment.

Specifically, in the fan axis direction DRa, one end 132c of the inner end surface 132a of the separation plate 13 is located on the other side than the other end 185c of the separation tube end surface 185a. In the fan axis direction DRa, the other end 131c of the outer end surface 131a of the separation plate 13 is located on one side of the one end 152c of the partition plate end surface 152a.

Therefore, in the vertical cross section of the blower 10, when linearly complementing the connection between the other end 185 of the separation tube and the inner end 132 of the separation plate, a bend is formed between the separation plate 13 and the separation tube 18. The separation plate 13 and the separation cylinder 18 are not connected so as to be continuous. The same applies to the relative positional relationship between the separation plate 13 and the partition plate 15.

Except as described above, this embodiment is the same as the first embodiment. Then, in the present embodiment, it is possible to obtain the effects obtained from the configuration common to the above-described first embodiment, similarly to the first embodiment.

Further, according to the present embodiment, in the fan axis direction DRa, one end 132c of the inner end surface 132a of the separation plate 13 is located on the other side than the other end 185c of the separation tube end surface 185a. I have. Therefore, when the outside air flows along the separation plate 13 as shown by the arrow Fa, the inertia of the outside air to flow to the other side in the fan axial direction DRa as shown by the arrow Fit is used, for example, as shown in FIG. It is possible to improve the output of the blower 10 as compared with the fourth comparative example.

(Third embodiment)
Next, a third embodiment will be described. In the present embodiment, points different from the first embodiment will be mainly described.

As shown in FIG. 7, in the vertical cross section of the blower 10, when linearly complementing so as to connect between the other end 185 of the separation tube and the inner end 132 of the separation plate, the separation plate 13 is continuously connected to the separation tube 18. It is arranged to be connected. Then, in the vertical section of the blower 10, when the linear plate is complemented linearly so as to connect between the separation plate outer end 131 and the partition plate inner end 152, the separation plate 13 is connected continuously from the partition plate 15. Are located in In this respect, the present embodiment is similar to the first embodiment.

However, as shown in FIG. 7, in the present embodiment, the shapes of the separation plate 13 and the partition plate 15 are different from those of the first embodiment. Note that arrows F1o and F2o in FIG. 7 indicate the flow of the outside air.

Specifically, in the vertical section of the blower 10, the separation plate 13 of the present embodiment does not extend linearly. In the vertical cross section, the separation plate 13 is curved so as to expand in the fan radial direction DRr at an angle closer to the direction orthogonal to the fan axis CL as going from the separation plate inner end 132 to the separation plate outer end 131. In other words, in the vertical cross section of the blower 10, the separation plate 13 is configured such that the tangential direction of the separation plate 13 approaches the direction orthogonal to the fan axis CL as going from the separation plate inner end 132 to the separation plate outer end 131. It is curved.

At the position of the separation plate inner end 132, the separation plate 13 extends toward the inside in the fan radial direction DRr and toward one side in the oblique fan axial direction DRa. At the position of the separation plate outer end 131, the separation plate 13 extends in a direction orthogonal to the fan axis CL.

Therefore, the center Crf of the radius of curvature Rf of the separation plate 13 shown in the vertical section of the blower 10 is located on one side of the separation plate 13 in the fan axis direction DRa. Further, the separation plate 13 represented in the longitudinal section is curved over, for example, the entire width in the fan radial direction DRr.

仕 The partition plate 15 of the present embodiment is not formed so as to be bent in the vertical section of the blower 10. As shown in FIG. 7, in the longitudinal section of the blower 10, the partition plate 15 extends straight from the partition plate inner end 152 to the partition plate outer end 151 in the fan radial direction DRr at right angles to the fan axis CL (see FIG. 1). Extending.

Except as described above, this embodiment is the same as the first embodiment. Then, in the present embodiment, it is possible to obtain the effects obtained from the configuration common to the above-described first embodiment, similarly to the first embodiment.

Further, according to the present embodiment, in the vertical cross section of the blower 10, the separation plate 13 extends in the fan radial direction at an angle closer to the direction orthogonal to the fan axis CL as going from the separation plate inner end 132 to the separation plate outer end 131. It is curved so as to spread to DRr. Accordingly, it is possible to reduce the pressure loss caused by the outside air having the velocity component flowing along the separation tube 18 and facing the other side in the fan axis direction DRa colliding with the separation plate 13. Then, the outer air is guided along the separating plate 13 to guide the outer air outward in the fan radial direction DRr while reducing the velocity component of the outer air directed to the other side in the fan axial direction DRa. Is possible.

Note that this embodiment is a modification based on the first embodiment, but it is also possible to combine this embodiment with the above-described second embodiment.

(Fourth embodiment)
Next, a fourth embodiment will be described. In the present embodiment, points different from the third embodiment will be mainly described.

As shown in FIG. 8, in the vertical cross section of the blower 10, when linearly complementing so as to connect the other end 185 of the separation tube and the inner end 132 of the separation plate, the separation plate 13 is continuously connected to the separation tube 18. It is arranged to be connected. In this respect, the present embodiment is similar to the third embodiment.

However, in the present embodiment, when complementation is performed linearly so as to connect between the separation plate outer end 131 and the partition plate inner end 152 in the vertical cross section of the blower 10, the complemented complementary portion 135 is attached to the separation plate 13. On the other hand, it is connected continuously, but is bent and connected to the partition plate 15. That is, in the case of such complementation, the separation plate 13 and the partition plate 15 are not connected so as to be continuous. In this respect, the present embodiment is different from the third embodiment.

In the present embodiment, the shape of the separation plate 13 is different from that of the third embodiment, and the separation plate 13 of the present embodiment is not curved in the vertical cross section of the blower 10.

Specifically, in the present embodiment, in the vertical cross section of the blower 10, the angle formed by the separation plate 13 with respect to the fan axis CL increases from the inner end 132 of the separation plate toward the outer end 131 of the separation plate. It is formed so as to gradually approach an angle orthogonal to the heart CL.

Specifically, the separation plate 13 includes a separation plate outer portion 133 and a separation plate inner portion 134 disposed inside the fan radial direction DRr with respect to the separation plate outer portion 133 and connected in series to the separation plate outer portion 133. Have. The separator outer portion 133 includes a separator outer end 131 and the separator inner portion 134 includes a separator inner end 132.

In the vertical section of the blower 10, both the outer portion 133 of the separating plate and the inner portion 134 of the separating plate linearly extend so that the outer side in the fan radial direction DRr is located on the other side in the fan axial direction DRa. However, in the vertical cross section, the angle formed by the outer portion 133 of the separation plate with respect to the fan axis CL is more perpendicular to the angle of the fan axis CL than the angle formed by the inner portion 134 of the separation plate with respect to the fan axis CL. The angle is close. Therefore, the separation plate inner portion 134 is connected to the separation plate outer portion 133 so as to be bent at the boundary between the separation plate inner portion 134 and the separation plate outer portion 133.

Except as described above, this embodiment is the same as the third embodiment. Then, in the present embodiment, it is possible to obtain the same effect as that of the third embodiment, which is achieved by the same configuration as the third embodiment.

Further, according to the present embodiment, in the vertical section of the blower 10, the angle of the separation plate 13 with respect to the fan axis CL increases as the separation plate 13 moves from the separation plate inner end 132 to the separation plate outer end 131. It is formed so as to gradually approach an angle perpendicular to the axis CL. Accordingly, it is possible to reduce the pressure loss caused by the outside air having the velocity component flowing along the separation tube 18 and facing the other side in the fan axis direction DRa colliding with the separation plate 13. Then, the outer air is guided along the separating plate 13 to guide the outer air outward in the fan radial direction DRr while reducing the velocity component of the outer air directed to the other side in the fan axial direction DRa. Is possible.

(Fifth embodiment)
Next, a fifth embodiment will be described. In this embodiment, points different from the first embodiment will be mainly described.

As shown in FIG. 9, in the vertical cross section of the blower 10, when complementing linearly so as to connect between the other end 185 of the separation tube and the inner end 132 of the separation plate, the separation plate 13 is continuously connected to the separation tube 18. It is arranged to be connected. Then, in the vertical section of the blower 10, when the linear plate is complemented linearly so as to connect between the separation plate outer end 131 and the partition plate inner end 152, the separation plate 13 is connected continuously from the partition plate 15. Are located in In this respect, the present embodiment is similar to the first embodiment.

However, as shown in FIG. 9, in the present embodiment, the shape of the partition plate 15 is different from that of the first embodiment.

Specifically, in the vertical section of the blower 10, the partition plate 15 of the present embodiment has a fan diameter at an angle closer to the direction orthogonal to the fan axis CL as going outward from the partition plate inner end 152 in the fan radial direction DRr. It is curved so as to expand in the direction DRr. In other words, in the vertical cross section of the blower 10, the partition plate 15 is arranged such that the tangential direction of the partition plate 15 approaches the direction orthogonal to the fan axis CL as going from the partition plate inner end 152 toward the outside in the fan radial direction DRr. Is curved.

Specifically, in the vertical cross section of the blower 10, the partition plate outer portion 153 and the partition plate inner portion 154 are connected so as to be continuous with each other without being bent at their boundaries. The partition plate outer portion 153 extends linearly in the fan radial direction DRr orthogonally to the fan axis CL (see FIG. 1) over the entire length thereof.

一方 で On the other hand, the inner side portion 154 of the partition plate is curved so as to expand in the fan radial direction DRr at an angle closer to the direction orthogonal to the fan axis CL as it goes outward in the fan radial direction DRr. At the position of the partition plate inner end 152, the partition plate inner portion 154 extends toward one side in the oblique fan axial direction DRa while facing inward in the fan radial direction DRr. Further, the partition plate inner portion 154 extends in a direction perpendicular to the fan axis CL at a position where the partition plate inner portion 154 is connected to the partition plate outer portion 153.

Therefore, the center Crd of the radius of curvature Rd of the partition plate inner portion 154 shown in the longitudinal section of the blower 10 is located on one side of the partition plate 15 in the fan axis direction DRa.

Except as described above, this embodiment is the same as the first embodiment. Then, in the present embodiment, it is possible to obtain the effects obtained from the configuration common to the above-described first embodiment, similarly to the first embodiment.

Further, according to the present embodiment, in the vertical cross section of the blower 10, the partition plate 15 has a fan diameter at an angle closer to a direction orthogonal to the fan axis CL as going outward from the partition plate inner end 152 in the fan radial direction DRr. It is curved so as to expand in the direction DRr. Therefore, it is possible to gradually change the direction of the air flowing along the partition plate 15 so as to approach a direction orthogonal to the fan axis and facing outward in the fan radial direction DRr. As a result, for example, it is possible to reduce the pressure loss caused by the outside air blown from the centrifugal fan 12 as shown by the arrow F2o to collide with the partition plate 15.

Note that the present embodiment is a modification based on the first embodiment, but the present embodiment can be combined with any of the above-described second to fourth embodiments.

(Sixth embodiment)
Next, a sixth embodiment will be described. In this embodiment, points different from the first embodiment will be mainly described.

As shown in FIG. 10, in the vertical cross section of the blower 10, the angle formed by the partition plate 15 with respect to the fan axis CL increases from the partition plate inner end 152 toward the outside in the fan radial direction DRr. It is formed so as to gradually approach an angle orthogonal to the heart CL. In this respect, the present embodiment is similar to the first embodiment.

However, the partition plate 15 is bent at one bending point as shown in FIG. 2 in the first embodiment, but is bent at two points as shown in FIG. 10 in the present embodiment. That is, the partition plate 15 of the present embodiment has the bent portions P1 and P2.

Therefore, in the present embodiment, as shown in FIG. 10, the partition plate 15 is provided between the partition plate outer portion 153 and the partition plate inner portion 154 in addition to the partition plate outer portion 153 and the partition plate inner portion 154. A partition intermediate portion 155. The partition plate middle portion 155 is connected to the partition plate outer portion 153 at the bending point P1, and is connected to the partition plate inner portion 154 at the bending point P2.

The partition plate intermediate portion 155 is included in a portion located on the other side of the partition plate inner end 152 in the fan axis direction DRa.

Except as described above, this embodiment is the same as the first embodiment. Then, in the present embodiment, it is possible to obtain the effects obtained from the configuration common to the above-described first embodiment, similarly to the first embodiment.

(Seventh embodiment)
Next, a seventh embodiment will be described. In the present embodiment, points different from the third embodiment will be mainly described.

で は As shown in FIG. 11, in the present embodiment, the separation plate 13 has a curved shape in the vertical section of the blower 10. In this respect, the present embodiment is the same as the third embodiment. However, in the present embodiment, in the vertical section of the blower 10, the separation plate 13 is not curved over the entire width in the fan radial direction DRr. In this respect, the present embodiment is different from the third embodiment.

Specifically, as shown in FIG. 11, in the vertical section of the blower 10, the separation plate 13 is provided between two linear portions 13a and 13b extending linearly and the two linear portions 13a and 13b. And a curved portion 13c which is curved. The two straight portions 13a and 13b are continuously connected via the curved portion 13c.

Except as described above, this embodiment is the same as the third embodiment. Then, in the present embodiment, it is possible to obtain the same effect as that of the third embodiment, which is achieved by the same configuration as the third embodiment.

(Eighth embodiment)
Next, an eighth embodiment will be described. In the present embodiment, points different from the above-described fourth embodiment will be mainly described.

In the fourth embodiment, as shown in FIG. 8, in the vertical cross section of the blower 10, the separation plate 13 is formed with respect to the fan axis CL as the separation plate 13 moves from the separation plate inner end 132 to the separation plate outer end 131. It is formed so that the angle gradually approaches an angle orthogonal to the fan axis CL. On the other hand, the separation plate 13 of the present embodiment shown in FIG. 12 is not formed as such.

Specifically, as shown in FIG. 12, the separation plate 13 of the present embodiment is similar to the separation plate 13 of the first embodiment in the vertical section of the blower 10 from the separation plate inner end 132 to the separation plate outer end 131. It extends linearly.

Except as described above, this embodiment is the same as the fourth embodiment. Then, in the present embodiment, it is possible to obtain the effects achieved by the configuration common to the above-described fourth embodiment, similarly to the fourth embodiment.

(Ninth embodiment)
Next, a ninth embodiment will be described. In this embodiment, points different from the first embodiment will be mainly described.

よ う As shown in FIG. 13, in the present embodiment, the partition plate 15 is different from the first embodiment.

Specifically, the partition plate inner portion 154 extends so that the outer side in the fan radial direction DRr is located on the other side in the fan axial direction DRa. In this respect, the partition plate 15 of the present embodiment is similar to the partition plate 15 of the first embodiment.

However, in the present embodiment, unlike the first embodiment, the partition plate outer portion 153 extends so that the outer side in the fan radial direction DRr is located on one side in the fan axial direction DRa. Therefore, the partition plate 15 has a boundary portion 156 between the partition plate outer portion 153 and the partition plate inner portion 154, and the boundary portion 156 is located on the other side of the partition plate 15 in the fan axis direction DRa. Part. Naturally, the boundary portion 156 is included in a portion located on the other side of the partition plate inner end 152 in the fan axis direction DRa.

Except as described above, this embodiment is the same as the first embodiment. Then, in the present embodiment, it is possible to obtain the effects obtained from the configuration common to the above-described first embodiment, similarly to the first embodiment.

Note that the present embodiment is a modification based on the first embodiment, but the present embodiment can be combined with any of the above-described second to eighth embodiments.

(Tenth embodiment)
Next, a tenth embodiment will be described. In this embodiment, points different from the first embodiment will be mainly described.

よ う As shown in FIG. 14, in the present embodiment, the orientation of the main plate guide surface 122a is different from that of the first embodiment.

Specifically, in the longitudinal section of the blower 10 shown in FIG. 14, an intersection Pn at which the normal Ln of the inner surface 182 of the separation cylinder at the other end position PTa of the separation cylinder intersects with the main plate guide surface 122a is obtained as the main plate guide surface intersection Pn. Can be In this case, in the longitudinal section of the blower 10, the tangential direction D2t of the main plate guide surface 122a obtained at the main plate guide surface intersection Pn is larger than the tangential direction D1t of the inner surface 182 of the separation cylinder obtained at the other end position PTa of the separation cylinder. The direction is close to the direction orthogonal to the heart CL.

Thus, in the present embodiment, as in the first embodiment, the rate of change of the flow path cross-sectional area of the flow path formed between the inner surface 182 of the separation cylinder and the main plate guide surface 122a and through which the inner air flows can be reduced. it can. In addition, FIG. 14 shows a two-dot chain line L1t that is parallel to the tangential direction D1t of the inner surface 182 of the separation cylinder and passes through the intersection Pn of the main plate guide surface for easy viewing.

Except as described above, this embodiment is the same as the first embodiment. Then, in the present embodiment, it is possible to obtain the effects obtained from the configuration common to the above-described first embodiment, similarly to the first embodiment.

Note that the present embodiment is a modification based on the first embodiment, but the present embodiment can be combined with any of the above-described second to ninth embodiments.

(Eleventh embodiment)
Next, an eleventh embodiment will be described. In this embodiment, points different from the above-described first embodiment will be mainly described, but before that, first, the same points as those in the first embodiment will also be described.

As shown in FIGS. 15 and 16, each of the plurality of blades 121 has a blade one-side part 121c and a blade other-side part 121d, as in the first embodiment. In the description of the present embodiment, the blade one-side portion 121c is also referred to as one-side blade 121c, and the other blade portion 121d is also referred to as the other-side blade 121d.

Further, as in the first embodiment, the suction port 14a has a cylindrical outer suction port 14b formed outside the fan radial direction DRr with respect to the one side portion 183 of the separation cylinder 18, and a fan radial direction with respect to the one side portion 183. And a cylinder inner suction port 14c formed inside DRr. The cylinder outer suction port 14b is an annular opening formed so as to surround the outer peripheral side of the cylinder inner suction port 14c.

Similarly to the first embodiment, each of the plurality of one-side blades 121c has a one-side blade front edge 121e located at the upstream end of the airflow between the plurality of one-side blades 121c. I have. Each of the plurality of one-side blades 121c has a one-side blade trailing edge 121f located at the downstream end of the airflow between the plurality of one-side blades 121c. That is, the one-side blade leading edge 121e constitutes a part of an inlet of an air passage formed between the one-side blades 121c, and the one-side blade trailing edge 121f serves as an outlet of the air passage. It constitutes a part.

Similarly, the other blades 121d each have a leading edge 121g of the other blade located at the upstream end of the airflow between the other blades 121d. The plurality of other-side blades 121d each have a second-side blade trailing edge 121h located at the downstream end of the airflow between the plurality of other-side blades 121d. That is, the other-side blade leading edge 121g constitutes a part of the inlet of the air passage formed between the other-side blade 121d, and the other-side blade trailing edge 121h serves as the outlet of the air passage. It constitutes a part.

Similarly to the first embodiment, the inner diameter DIb of the plurality of other blades 121d about the fan axis CL is larger than the inner diameter DIa of the plurality of one blades 121c about the fan axis CL. small. More specifically, the inner diameter dimension DIb of the other side blade 121d is the diameter of a virtual cylindrical surface centered on the fan axis CL and in contact with the plurality of other side blades 121d on the radially inner side. In other words, the inner diameter dimension DIb of the other side blade 121d is a diameter of a virtual cylindrical surface centered on the fan axis CL and inscribed in the plurality of other side blades 121d. The same applies to the inner diameter DIa of the one-side blade 121c.

As described above, although the present embodiment has the same configuration as the first embodiment, the present embodiment differs from the first embodiment in the shape of the blade 121 and the shape of the separation plate 13.

Specifically, the outer diameter DOa of the plurality of one-side blades 121c about the fan axis CL is smaller than the outer diameter DOb of the plurality of other blades 121d about the fan axis CL. More specifically, the outer diameter dimension DOb of the other-side blade 121d is a diameter of a virtual cylindrical surface centered on the fan axis CL and in contact with the plurality of other-side blades 121d on the radially outer side. In other words, the outer diameter dimension DOb of the other-side blade 121d is a diameter of a virtual cylindrical surface centered on the fan axis CL and circumscribing the plurality of other-side blades 121d. The same applies to the outer diameter dimension DOa of the one-side blade 121c.

As can be seen from the difference between the inner diameters DIb and DIa and the difference between the outer diameters DOb and DOa, the blade length LRb of the plurality of other blades 121d in the fan radial direction DRr is equal to the plurality of one sides in the fan radial direction DRr. It is longer than the blade length LRa of the blade 121c. Specifically, the blade length LRa of the one-side blade 121c is the radial width occupied by the one-side blade 121c in the fan radial direction DRr, and the blade length LRb of the other-side blade 121d is defined by the fan radial direction DRr. Is the radial width occupied by the other-side blade 121d. Therefore, the blade length LRa of the one-side blade 121c is obtained from the equation "LRa = (DOa-DIa) / 2", as shown in FIGS. Further, the blade length LRb of the other-side blade 121d is obtained from the equation "LRb = (DOb-DIb) / 2".

Also, as shown in FIG. 16, the height HFb of the other blade front edge 121g is smaller than the height HFa of the one blade front edge 121e in the fan axis direction DRa. At the same time, the height HBb of the other blade trailing edge 121h is smaller than the height HBa of the one blade trailing edge 121f in the fan axis direction DRa. In short, the other blade 121d has a blade shape longer in the fan radial direction DRr and shorter in the fan axial direction DRa than the one blade 121c. For example, the airfoil of the one-side blade 121c of this embodiment is an airfoil of a sirocco fan, and the airfoil of the other-side blade 121d is an airfoil of a turbofan.

分離 The separation plate 13 extends further inward in the fan radial direction DRr than the one-side blade 121c. At the same time, the separation plate 13 extends outside the one-side blade 121c in the fan radial direction DRr.

Except as described above, this embodiment is the same as the first embodiment. Then, in the present embodiment, it is possible to obtain the effects obtained from the configuration common to the above-described first embodiment, similarly to the first embodiment.

According to the present embodiment, as shown in FIGS. 15 and 16, each of the plurality of blades 121 has one blade 121c and the other blade 121d. The one-side blade 121c is a portion of the blade 121 on one side in the fan axis direction DRa with respect to the separation plate 13, and the other-side blade 121d is a portion of the blade 121 on the other side in the fan axis direction DRa with respect to the separation plate 13. is there. The separation plate 13 extends further inward than the one-side blade 121c in the fan radial direction DRr. As a result, the space between the one-side blade 121c and the separation tube 18 can be reduced by the fan diameter without increasing the gap between the separation tube 18 and the separation plate 13 as compared with the case where the separation plate 13 is not so. It can be extended in the direction DRr. Therefore, it is possible to reduce the pressure loss generated in the air sucked between the one-side blades 121c through the radially outer side of the separation cylinder 18.

According to the present embodiment, the inner diameter DIb of the plurality of other blades 121d about the fan axis CL is smaller than the inner diameter DIa of the plurality of one blades 121c about the fan axis CL. . Therefore, as compared with the case where the inner diameters DIa and DIb are not equal to each other, it is easier to increase the suction passage area radially inward with respect to the one-side blade 121c, and the pressure loss generated in the air sucked into the centrifugal fan 12 is increased. Can be reduced.

According to this embodiment, the inner diameter DIb of the other blade 121d is smaller than the inner diameter DIa of the one blade 121c, and the blade length LRb of the other blade 121d is equal to the blade length of the one blade 121c. Longer than LRa. Thereby, it is possible to reduce the impeller height (in other words, the fan height), which is the height of the centrifugal fan 12 in the fan axis direction DRa, without any disadvantage.

(Other embodiments)
(1) In the above-described first to tenth embodiments, for example, as shown in FIG. 2, the separation cylinder end surface 185a is a surface parallel to the fan axis direction DRa, but a surface inclined with respect to the fan axis direction DRa. It does not matter. The same applies to the outer end surface 131a of the separation plate 13, the inner end surface 132a of the separation plate 13, and the partition plate end surface 152a.

(2) In the above-described first to tenth embodiments, for example, as shown in FIG. 1, the width of the separation plate 13 in the fan radial direction DRr is the same as the width of the blade 121, but is not limited to this. is not. For example, the separation plate 13 may protrude outside or inside the fan radial direction DRr with respect to the blade 121. Further, the width of the separation plate 13 in the fan radial direction DRr may be smaller than the width of the blade 121.

(3) In each of the above-described embodiments, the centrifugal blower 10 is applied to an air conditioner for a two-layer internal / external air vehicle, but the use of the centrifugal blower 10 is not limited thereto. For example, the centrifugal blower 10 may be used for applications other than the vehicle air conditioner.

(4) In the above embodiments, for example, as shown in FIG. 1, the plate thickness of the partition plate 15, the plate thickness of the separation plate 13, and the plate thickness of the separation tube 18 are, for example, the same or substantially the same. , May be different from each other.

(5) In the above-described first to tenth embodiments, for example, as shown in FIG. 1, the air passage forming portion 142 and the partition plate 15 are formed as an integrally molded product formed by resin molding. Is an example. The fan casing 14 may be formed by assembling the air passage forming portion 142 and the partition plate 15 after the air passage forming portion 142 and the partition plate 15 are formed as separate members. Further, the air passage forming portion 142 may be composed of a plurality of members separately molded. The same applies to the partition plate 15.

(6) In the above-described first to tenth embodiments, for example, as shown in FIG. 1, the airfoil of the blade 121 is a sirocco fan airfoil in both the blade one-side portion 121c and the blade other-side portion 121d. Not limited to this.

For example, the airfoil of the blade one-side part 121c may be a sirocco fan airfoil, and the airfoil of the blade other-side part 121d may be a radial fan airfoil. Conversely, the airfoil of the blade one-side part 121c may be a radial fan airfoil, and the airfoil of the blade other-side part 121d may be a sirocco fan airfoil. Further, the airfoil of the blade one-side part 121c may be a sirocco fan airfoil, and the airfoil of the blade other-side part 121d may be a turbofan airfoil. Conversely, the airfoil of the blade one-side portion 121c may be a turbofan airfoil, and the airfoil of the blade other-side portion 121d may be a sirocco fan airfoil. Further, the airfoil of the blade one-side part 121c and the airfoil of the blade other-side part 121d may both be the airfoil of a radial fan. Further, the airfoil of the blade one-side portion 121c and the airfoil of the blade other-side portion 121d may both be the airfoil of a turbofan. In short, the airfoil of the blade one-side portion 121c and the airfoil of the blade other-side portion 121d may be the same or different. The number of blades on one side 121c and the number of blades on the other side 121d may be the same or different from each other.

(7) In the first embodiment, as shown in FIG. 2, in the longitudinal section of the blower 10, the extending direction of the separation plate 13 at the position of the separation plate inner end 132 and the separation tube 18 at the position of the separation tube other end 185. Are the same as each other, but this is an example. For example, it can be assumed that both stretching directions are different from each other. This is the same in the second and subsequent embodiments.

The extension direction of the separation plate 13 at the position of the separation plate outer end 131 and the extension direction of the partition plate 15 at the position of the partition plate inner end 152 are the same, but this is also an example. For example, it can be assumed that both stretching directions are different from each other. This is the same in the second and subsequent embodiments. In addition, each of the extending directions of the separation plate 13, the partition plate 15, and the separation tube 18 may be referred to as a gradient with respect to a predetermined reference (for example, the fan axis CL).

(8) In each of the above-described embodiments, for example, as shown in FIG. 1, a portion of the front edge of the blade 121 on the other side in the fan axis direction DRa with respect to the separation plate 13 is inclined with respect to the fan axis CL. However, the shape of the leading edge of the blade 121 is not limited. For example, the front edge of the blade 121 may extend from one end 121a to the other end 121b along the fan axis CL. Further, a portion of the front edge of the blade 121 on one side in the fan axis direction DRa with respect to the separation plate 13 may be inclined with respect to the fan axis CL.

(9) The present disclosure is not limited to the above embodiments, and can be implemented with various modifications. The above embodiments are not irrelevant to each other, and can be appropriately combined unless a combination is clearly not possible.

In each of the above embodiments, it is needless to say that the elements constituting the embodiment are not necessarily essential, unless otherwise clearly indicated as essential or in principle considered to be clearly essential. No. In each of the above embodiments, when a numerical value such as the number, numerical value, amount, range, or the like of the constituent elements of the exemplary embodiment is mentioned, it is particularly limited to a specific number when it is clearly stated that it is essential and in principle The number is not limited to the specific number unless otherwise specified.

Further, in each of the above embodiments, when referring to the material, shape, positional relationship, and the like of the components and the like, unless otherwise specified, and in principle, it is limited to a specific material, shape, positional relationship, and the like. However, the material, shape, positional relationship, and the like are not limited.

(Summary)
According to a first aspect shown in a part or all of the above embodiments, the centrifugal fan blows air taken in from one axial side of the fan shaft toward the outside in the radial direction. , A fan casing, and a separation cylinder. The separation tube extends in the radial direction of the centrifugal fan toward the other side in the axial direction. At the other end position of the separation tube, which is the position of the other end in the axial direction, the diameter is oblique to the axial direction. It has a shape that extends outward in the direction.

According to a second aspect, the separation plate has a separation plate outer end provided on the radially outer side and a separator plate inner end provided on the radially inner side. The inner end of the separation plate is located on one side in the axial direction with respect to the outer end of the separation plate. Therefore, it is possible to reduce the pressure loss caused by the outside air having the velocity component flowing along the separation cylinder and having the velocity component directed to the other side in the axial direction colliding with the separation plate.

Further, according to the third aspect, in a vertical cross section obtained by cutting the centrifugal fan in a plane including the fan axis, the separation plate is oriented in a direction perpendicular to the fan axis from the inner end of the separation plate to the outer end of the separation plate. It is curved so as to spread in the radial direction at a close angle. Therefore, it is possible to reduce the pressure loss caused by the outside air having the velocity component flowing along the separation cylinder and having the velocity component directed to the other side in the axial direction colliding with the separation plate. By arranging the outer air along the separation plate, it is possible to guide the outer air outward in the radial direction while reducing the velocity component of the outer air toward the other side in the axial direction. is there.

Further, according to the fourth aspect, in a vertical cross section obtained by cutting the centrifugal fan in a plane including the fan axis, the separation plate is moved from the inner end of the separation plate toward the outer end of the separation plate with respect to the fan axis. The angle is formed so as to gradually approach an angle perpendicular to the fan axis. Even in this case, the same operation and effect as the operation and effect according to the third aspect can be obtained.

According to the fifth aspect, the partition plate has a partition plate inner end provided inside the radial direction and a portion located on the other side in the axial direction with respect to the partition plate inner end. ing. Therefore, the air blown out from between the plurality of blades flows around the inner end of the partition plate and has a velocity component directed to the other side in the axial direction and outwardly in the radial direction oblique to the axial direction. It is hard to prevent that. Therefore, it is possible to reduce the pressure loss caused by the outside air blown from between the blades colliding with the partition plate.

According to the sixth aspect, the fan casing has an outer peripheral wall that faces the outlet air passage from the outside in the radial direction. Further, the partition plate has a partition plate outer end provided on the outer side in the radial direction and connected to the outer peripheral wall, and at the position of the partition plate outer end, a shape expanding along a direction perpendicular to the axial direction is provided. Has formed. Therefore, in comparison with the case where the partition plate has a shape that spreads radially outward while facing the other side in the axial direction, for example, at the position of the partition plate outer end, the outer periphery of the fan casing along the partition plate A sudden change in the direction of the outside air reaching the wall can be suppressed. As a result, it is possible to increase the output of the centrifugal blower.

According to the seventh aspect, in a vertical section obtained by cutting the centrifugal fan in a plane including the fan axis, the partition plate is oriented in a direction perpendicular to the fan axis as going from the inner end of the partition plate to the outside in the radial direction. It is curved so as to expand in the radial direction at an angle close to. Therefore, it is possible to gradually change the direction of the air flowing along the partition plate so as to approach a direction perpendicular to the fan axis and facing outward in the radial direction. As a result, for example, it is possible to reduce the pressure loss caused by the outside air blown from the centrifugal fan colliding with the partition plate.

Further, according to the eighth aspect, in a vertical cross section obtained by cutting the centrifugal fan in a plane including the fan axis, the partition plate is arranged such that the more the partition plate extends from the inner end of the partition plate toward the outside in the radial direction, the closer to the fan axis. The angle formed with respect to the axis of the fan gradually approaches an angle perpendicular to the fan axis. Even in this case, the same operation and effect as the above-described operation and effect according to the seventh aspect can be obtained.

According to a ninth aspect, the separation plate has an inner end face extending from one side in the axial direction to the other side at the position of the inner end in the radial direction. The separation cylinder has a separation cylinder end face extending from one side in the axial direction to the other side at the other end position of the separation cylinder. In the axial direction, the other end of the inner end face is located on the other side than the one end of the separation cylinder end face. Therefore, compared with the case where the other end of the inner end face is located on one side of the one end of the separation cylinder end face, the two air flows separated by the separation cylinder are separated by the separation cylinder and the separation plate. Can be prevented from intermingling via a gap between them.

According to a tenth aspect, the separation plate has an outer end surface extending from one side in the axial direction to the other side at the position of the outer end in the radial direction. In addition, the partition plate has a partition plate end surface extending from one side in the axial direction to the other side at the position of the inner end in the radial direction. In the axial direction, one end of the outer end surface is located on one side of the other end of the partition plate end surface. Therefore, compared to the case where one end of the outer end surface is located on the other side of the other end of the partition plate end surface, the two air flows separated by the separation plate are separated by the separation plate and the separation plate. Can be prevented from intermingling via a gap between them.

According to the eleventh aspect, the centrifugal fan has a plate-shaped main plate that is disposed on the other side of the separation tube in the axial direction and that expands in the radial direction. The main plate has, on one side in the axial direction, a main plate guide surface for guiding the inside air so that the inside air flows outward in the radial direction. Further, the separation cylinder has an inner surface on the separation cylinder extending to the other end position of the separation cylinder including the inward surface facing inward in the radial direction. The main plate guide surface extends such that the outer side in the radial direction is positioned on the other side in the axial direction. In the vertical section obtained by cutting the centrifugal fan in a plane including the fan axis, the tangential direction of the main plate guide surface obtained at the intersection of the normal line of the inner surface of the separation tube at the other end position of the separation tube and the main plate guide surface is separated. It has the same direction as the tangential direction of the inner surface of the separation cylinder obtained at the position of the other end of the cylinder. Alternatively, in the longitudinal section, the tangential direction of the main plate guide surface is closer to the direction orthogonal to the fan axis than the tangential direction of the inner surface of the separation cylinder.

Here, in the flow path formed between the inner surface of the separation cylinder and the main plate guide surface and through which the inner air flows, the circumferential length of the flow path section centered on the fan axis becomes longer toward the downstream side. The change in length acts to increase the flow path cross-sectional area toward the downstream side. And, assuming that the tangential direction of the inner surface of the separation cylinder is closer to the direction orthogonal to the fan axis than the tangential direction of the main plate guide surface, it appears in the longitudinal section. The change in the height of the cross section of the flow path promotes an increase in the cross sectional area of the flow path.

On the other hand, in the eleventh aspect, a change in the height of the flow path cross section appearing in the vertical cross section does not easily promote an increase in the flow path cross sectional area. Therefore, the rate of change of the flow path cross-sectional area of the flow path through which the inside air flows can be reduced as compared with the above assumed case.

According to the twelfth aspect, each of the plurality of blades is a blade one-side portion of the blade, which is a portion of the blade on one side in the axial direction with respect to the separation plate, and the other of the blades in the axial direction with respect to the separation plate. And the other side portion of the blade that is a side portion. The separating plate extends to the radially inner side than the one side portion of the blade. Thereby, the space between the one side portion of the blade and the separation tube can be expanded in the radial direction without expanding the gap between the separation tube and the separation plate as compared with the case where the separation plate is not so. it can. Therefore, it is possible to reduce the pressure loss generated in the air sucked between the blades on one side through the radially outer side of the separation cylinder.

According to the thirteenth aspect, the inside diameter of the blade on the other side around the fan axis is smaller than the inside diameter of the blade on the side of the fan center. Therefore, it is easy to increase the suction flow path area radially inward with respect to the one side portion of the blade, and it is possible to reduce the pressure loss generated in the air sucked into the centrifugal fan.

Claims (13)

1. A centrifugal blower,
   It has a plurality of blades (121) arranged around the fan axis (CL), and a separation plate (13), and is configured to receive air taken in from one side of the fan axis in the axial direction (DRa) in the radial direction (DRr). A) a centrifugal fan (12) that blows out toward the outside;
   An intake port (14a) that accommodates the centrifugal fan, is disposed on the one side in the axial direction with respect to the centrifugal fan, and is provided outside the radial direction with respect to the centrifugal fan. An outlet air passage (142a) through which air blown from the centrifugal fan flows is formed, and the outlet air passage is arranged on the other side in the axial direction with respect to the first air passage (142b) and the first air passage. A fan casing (14) having a partition plate (15) for partitioning the second air passage (142c) from the fan casing (14).
   A separation cylinder (18) disposed in the radial direction of the centrifugal fan with respect to the plurality of blades and having a cylindrical shape facing the axial direction;
   The separation cylinder separates air passing through the suction port into inner air flowing inside the radial direction with respect to the separation cylinder and outer air flowing outside the radial direction with respect to the separation cylinder.
   The separating plate has a plate shape that expands in the radial direction, and the outside air flows on the one side in the axial direction with respect to the separating plate between the plurality of blades, and the axial direction with respect to the separating plate. It is arranged so that the inside air flows on the other side,
   The partition plate is arranged such that the outside air flows into the first air passage from the centrifugal fan and the inside air flows into the second air passage,
   The separation tube extends in the radial direction toward the other side in the axial direction, and at the other end position (PTa) of the separation tube, which is the position of the other end in the axial direction, is inclined with respect to the axial direction. A centrifugal blower, which has a shape expanding toward the outside in the radial direction.
2. The separation plate has a separation plate outside end (131) provided outside the radial direction and a separation plate inside end (132) provided inside the radial direction.
   The centrifugal blower according to claim 1, wherein the inner edge of the separation plate is located on the one side in the axial direction with respect to the outer edge of the separation plate.
3. In a vertical cross section obtained by cutting the centrifugal fan in a plane including the fan axis, the separation plate has an angle closer to a direction perpendicular to the fan axis as going from the separation plate inner end to the separation plate outer end. The centrifugal blower according to claim 2, wherein the blower is curved so as to expand in a radial direction.
4. In a vertical section obtained by cutting the centrifugal fan in a plane including the fan axis, the separation plate is formed at an angle formed by the separation plate with respect to the fan axis from the inner end of the separation plate toward the outer end of the separation plate. 3. The centrifugal blower according to claim 2, wherein the fan is formed so as to gradually approach an angle orthogonal to the fan axis.
5. The partition plate includes a partition plate inner end (152) provided inside the radial direction and a portion (153, 155, 156) located on the other side in the axial direction with respect to the partition plate inner end. The centrifugal blower according to any one of claims 1 to 4, comprising:
6. The fan casing has an outer peripheral wall (143) facing the blow-off air passage from the outside in the radial direction,
   The partition plate has a partition plate outer end (151) provided outside the radial direction and connected to the outer peripheral wall, and at a position of the partition plate outer end, along a direction orthogonal to the axial direction. The centrifugal blower according to claim 5, wherein the blower has an expanding shape.
7. In a vertical cross section obtained by cutting the centrifugal fan in a plane including the fan axis, the partition plate has an angle closer to a direction orthogonal to the fan axis as going radially outward from the partition plate inner end. The centrifugal blower according to claim 5, wherein the blower is curved so as to expand in a radial direction.
8. In a vertical cross section obtained by cutting the centrifugal fan in a plane including the fan axis, the partition plate is formed by an angle formed by the partition plate with respect to the fan axis as going radially outward from the partition plate inner end. The centrifugal blower according to claim 5 or 6, wherein the fan is formed so as to gradually approach an angle perpendicular to the fan axis.
9. The separation plate has an inner end surface (132a) extending from the one side in the axial direction to the other side at a position of an inner end in the radial direction,
   The separation tube has a separation tube end surface (185a) extending from the one side in the axial direction to the other side at the other end position of the separation tube,
   9. The axial direction, wherein the other end (132b) of the inner end surface is located on the other side of the one end (185b) of the separation cylinder end surface. The centrifugal blower according to any one of the above.
10. The separation plate has an outer end surface (131a) extending from the one side in the axial direction to the other side at a position of the outer end in the radial direction,
    The partition plate has a partition end surface (152a) extending from the one side in the axial direction to the other side at a position of an inner end in the radial direction,
    The one end (131b) of the outer end surface in the axial direction is located closer to the one side than the other end (152b) of the partition plate end surface. The centrifugal blower according to any one of the above.
11. The centrifugal fan has a plate-shaped main plate (122) that is disposed on the other side in the axial direction with respect to the separation cylinder and that expands in the radial direction.
    The main plate has, on the one side in the axial direction, a main plate guide surface (122a) for guiding the inside air such that the inside air flows toward the outside in the radial direction,
    The separation cylinder has a separation cylinder inner side surface (182) that includes an inward surface (182a) that faces inward in the radial direction and extends to the other end position of the separation cylinder.
    The main plate guide surface extends so as to be located on the other side in the axial direction toward the outside in the radial direction,
    In a vertical section obtained by cutting the centrifugal fan on a plane including the fan axis, at a point of intersection (Pn) where a normal (Ln) of the inner surface of the separation cylinder at the other end position of the separation cylinder intersects with the main plate guide surface. The tangential direction (D2t) of the obtained main plate guide surface is the same as the tangential direction (D1t) of the inner surface of the separation cylinder obtained at the other end position of the separation cylinder, or is larger than the tangential direction of the inner surface of the separation cylinder. The centrifugal blower according to any one of claims 1 to 10, wherein the blower is oriented substantially perpendicular to the fan axis.
12. Each of the plurality of blades is a blade one-side portion (121c), which is the one portion of the blade in the axial direction with respect to the separation plate, and the other one of the blades in the axial direction with respect to the separation plate. And the other side portion (121d) of the blade,
    The centrifugal blower according to any one of claims 1 to 11, wherein the separation plate extends further inward in the radial direction than the one side portion of the blade.
13. 13. The inner diameter dimension (DIb) of the blade other side portion centered on the fan axis center is smaller than the inner diameter size (DIa) of the blade one side portion centered on the fan axis center. Centrifugal blower.

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