WO2019107269A1

WO2019107269A1 - Centrifugal fan and air conditioning indoor unit having centrifugal fan

Info

Publication number: WO2019107269A1
Application number: PCT/JP2018/043164
Authority: WO
Inventors: あづみ小嶋; 貴士柏原; 波留奈杉本; 高岡　成幸
Original assignee: ダイキン工業株式会社
Priority date: 2017-11-29
Filing date: 2018-11-22
Publication date: 2019-06-06
Also published as: CN212774912U; JP6690629B2; JP2019100209A

Abstract

Provided is a centrifugal fan that promotes compactness. This centrifugal fan (4) has a main plate (30), a shroud (40), and a plurality of blades (50) as members constituting an impeller (8). The impeller (8) rotates in conjunction with a fan motor (7). The main plate (30) is disposed such that the thickness direction thereof is aligned with a rotation axis line direction. The torque of the fan motor (7) is transmitted to the main plate (30). The shroud (40) is disposed spaced apart from the main plate (30) in the rotation axis line direction. The shroud (40) appears as a ring shape when viewed in the rotation axis line direction. The shroud (40) is metallic. The blades (50) are disposed between the main plate (30) and the shroud (40). One end (a shaft end section (70) on the main plate side) of each of the blades (50) is joined to the main plate (30). The other end (a shaft end section (75) on the shroud side) of each of the blades (50) is joined to the shroud (40) by a joining method (an adhesive (90)) other than welding.

Description

Air conditioning indoor unit with centrifugal fan or centrifugal fan

The present disclosure relates to a centrifugal fan or an air conditioning indoor unit having a centrifugal fan.

Heretofore, as disclosed in, for example, Patent Document 1 (Japanese Patent Application Laid-Open No. 60-18243), a plate to which the rotational force of a motor is transmitted, and a plate as a member constituting an impeller rotating in conjunction with the motor And a metallic ring spaced in the direction of the axis of rotation and shaped like a ring when viewed from the direction of the axis of rotation, and a plurality of blades arranged between the plate and the ring and joined to the ring by welding Fans are known.

In the above-described centrifugal fan, since the metal ring and the blade are joined by welding, it is necessary to secure a large thickness of the ring in order to suppress distortion during welding. In connection with this, the miniaturization of the impeller is restricted. Provide a centrifugal fan that promotes compactness.

The centrifugal fan according to the first aspect includes a plate, a ring, and a plurality of blades as members constituting an impeller. The impeller rotates in conjunction with the motor. The plate is disposed such that the thickness direction is along the rotation axis direction. The plate is transmitted with the rotational force of the motor. The ring is axially spaced from the plate. The ring has a ring shape as viewed from the rotational axis direction. The ring is made of metal. The blade is disposed between the plate and the ring. The blade is joined at one end to the plate. The other end of the blade is joined to the ring by a joining method other than welding.

By joining the ring and each blade by a joining method other than welding, it is possible to make the thickness of the ring smaller as compared to the case where both are joined by welding. In connection with this, downsizing of the impeller is possible, and downsizing of the centrifugal fan is promoted.

In addition, the “joining method other than welding” here is heating (or pressing) the metal base material (here ring) to melt and integrate two or more members (here ring and blade) Any bonding method other than the bonding method used, for example, bonding and fixing using an adhesive, mechanical connection using screws or rivets (screw tightening or riveting etc.), or a temperature related to welding (eg 500 ° C.) The welding (ultrasonic welding, laser welding) or the like which has a lower temperature related to heating than the above.

The centrifugal fan of the second aspect is the centrifugal fan of the first aspect, and the blade is bonded to the ring by an adhesive. This makes it possible to reduce the thickness of the ring while suppressing the cost.

The centrifugal fan of the third aspect is the centrifugal fan of the second aspect, wherein the adhesive cures at a temperature at which the ring does not distort. This makes it possible to reduce the thickness of the ring while suppressing the cost.

The centrifugal fan of the fourth aspect is the centrifugal fan of the second aspect or the third aspect, wherein the blade has an adhesive surface. The adhesive surface has irregularities formed thereon. The blade is bonded to the ring at the bonding surface. This makes it possible to increase the bonding area between the blade and the ring, and promotes the improvement in strength.

The centrifugal fan according to the fifth aspect is the centrifugal fan according to any one of the first aspect to the fourth aspect, wherein the blade has a main body portion and an adhesive portion. The main body portion is a portion exhibiting a wing shape. The bonding portion is a portion bonded to the ring. The surface area of the adhesive facing the ring is greater than the cross-sectional area of the cutting plane perpendicular to the rotational axis of the body. This makes it possible to increase the bonding area and promotes the improvement in strength. Here, “perpendicular to the rotation axis direction” is not only strictly perpendicular to the rotation axis direction, but also in a state where it is inclined within a predetermined angle (for example, 30 degrees) with respect to the perpendicular of the rotation axis. Including.

The centrifugal fan according to the sixth aspect is the centrifugal fan according to any one of the first aspect to the fifth aspect, wherein the blade is joined to the ring by mechanical connection. This makes it possible to reduce the thickness of the ring while suppressing the cost. Here, “mechanical connection” is a joining method such as screwing and caulking using a fixing member such as a screw or a rivet.

The centrifugal fan of the seventh aspect is the centrifugal fan of the sixth aspect, wherein the blade has a flange at the other end. The flange extends perpendicularly to the rotational axis direction. The flange faces the ring. The blades are joined at the flange by a mechanical connection with the ring.

The centrifugal fan according to an eighth aspect is the centrifugal fan according to the sixth aspect or the seventh aspect, wherein the blade has the first member fixed to the other end. The first member is made of metal. The blade is joined by a mechanical connection with the ring via the first member.

The centrifugal fan according to a ninth aspect is the centrifugal fan according to any one of the sixth aspect to the eighth aspect, wherein the ring includes a flat portion and a curved portion. The flat portion extends perpendicularly to the rotational axis direction. The curved portion is curved and extends along the rotation axis direction from the inner end of the flat portion. The blades are joined by mechanical connection with the flats.

The centrifugal fan according to a tenth aspect is the centrifugal fan according to any one of the sixth aspect to the ninth aspect, wherein the blade is formed with one of a recess or an opening and a protrusion. The ring is formed with the other of a recess or opening and a protrusion. The blade is joined to the ring by caulking with the projection penetrating or engaging the recess or opening.

The centrifugal fan according to an eleventh aspect is the centrifugal fan according to any one of the first aspect to the tenth aspect, wherein the blade is made of resin. This promotes weight reduction of the blade. In connection with this, the centrifugal force of the blade is reduced and the securing of strength is promoted.

The centrifugal fan according to a twelfth aspect is the centrifugal fan according to any one of the first aspect to the eleventh aspect, and the blade has a wing shape in which a plurality of divided members are combined. The blade is hollow. This improves the manufacturability of the blade. In addition, weight reduction of the blade is promoted.

The centrifugal fan according to a thirteenth aspect is the centrifugal fan according to any one of the first aspect through the twelfth aspect, wherein the ring is joined to the blade in a state of being formed into a bell mouth shape by a spatula drawing process. This promotes cost control by not using a mold for ring production.

The centrifugal fan according to a fourteenth aspect is the centrifugal fan according to any one of the first aspect to the thirteenth aspect, wherein the ring is made of aluminum (made of aluminum or made of an aluminum alloy). This promotes weight reduction of the impeller.

The centrifugal fan according to the fifteenth aspect is the centrifugal fan according to any one of the first aspect through the fourteenth aspect, wherein the plate is made of metal. The blade is joined at one end to the plate by a joining method other than welding. By joining the plate and the blades by a joining method other than welding, it is possible to make the thickness of the plate smaller as compared to the case where both are joined by welding. In connection with this, the impeller can be miniaturized, and the centrifugal fan can be further miniaturized.

An air conditioning indoor unit according to a sixteenth aspect includes the centrifugal fan according to any one of the first through fifteenth aspects.

BRIEF DESCRIPTION OF THE DRAWINGS The external appearance perspective view of the air conditioning indoor unit which has a centrifugal fan which concerns on one Embodiment of this indication. Schematic which showed the cross section of the centrifugal fan. The figure which looked at the impeller of the centrifugal fan from the direction (rotational axis direction) where the rotation axis extends (figure seen from the shroud side). The figure which looked at the impeller from the rotation axis direction (figure seen from the main plate side). The figure which looked at the impeller of the centrifugal fan from the direction perpendicular | vertical to the rotation axis direction. The perspective view which looked at the impeller from the shroud side. The perspective view which looked at the impeller from the main plate side. The figure which looked at the blade from the rotation axis direction (figure seen from the shroud side). The figure which looked at the blade from the rotation axis direction (figure seen from the main plate side). The figure which looked at the braid | blade from the direction perpendicular | vertical to the rotation axis direction. The figure which looked at the blade from the opposite direction to FIG. The schematic diagram of the blade, the main plate, and the cross section of a part of shroud. The enlarged view which showed typically the junction part of a braid | blade and a main plate or a shroud. The schematic diagram which showed the joining aspect of the braid | blade which concerns on the modification 1, a main plate, and a shroud. The enlarged view which showed the A part in FIG. 14 typically. The schematic diagram which showed the application example of the joining aspect of the braid | blade which concerns on the modification 1, and a main plate and a shroud. The schematic diagram which showed the joining aspect of the braid | blade which concerns on the modification 2, and a main plate and a shroud. The enlarged view which showed B part in FIG. 17 typically. The schematic diagram which showed the application example of the junction aspect of the braid | blade which concerns on the modification 2, and a main plate and a shroud. The schematic diagram which showed the joining aspect of the braid | blade which concerns on the modification 3, and a main plate and a shroud. The enlarged view which showed the C section in FIG. 20 typically. The schematic diagram which showed the application example of the joining aspect of the braid | blade which concerns on the modification 3, and a main plate and a shroud. The schematic diagram which showed the joining aspect of the braid | blade which concerns on the modification 4, a main plate, and a shroud. The enlarged view which showed the D part in FIG. 23 typically. The schematic diagram which showed the application example of the joining aspect of the braid | blade which concerns on the modification 4, and a main plate and a shroud. The perspective view which looked at the impeller concerning modification 5 from the shroud side. The perspective view which looked at the impeller concerning a modification 5 from the main plate side. The schematic diagram which showed an example of the joining aspect of the braid | blade which concerns on the modification 5, a main plate, and a shroud. The schematic diagram which showed another example of the joining aspect of the braid | blade which concerns on the modification 5, a main plate, and a shroud. The schematic diagram which showed another example of the joining aspect of the braid | blade which concerns on the modification 5, a main plate, and a shroud. The schematic diagram which showed another example of the joining aspect of the braid | blade which concerns on the modification 5, a main plate, and a shroud.

Hereinafter, the centrifugal fan 4 according to an embodiment of the present disclosure will be described. The following embodiments are specific examples, and do not limit the technical scope, and can be appropriately changed without departing from the scope of the present invention. In the following description, “along the rotation axis direction” includes not only a direction that strictly coincides with the rotation axis direction, but also a state in which it inclines within a predetermined angle (for example, 30 degrees) with the rotation axis direction. . Further, "perpendicular to the rotation axis direction" includes not only a state strictly perpendicular to the rotation axis direction but also a state in which the inclination is within a predetermined angle (for example, 30 degrees) with respect to the perpendicular of the rotation axis.

(1) Air conditioning indoor unit 1
FIG. 1 is an external perspective view of an air conditioning indoor unit 1 having a centrifugal fan 4 according to an embodiment of the present disclosure. FIG. 2 is a schematic view showing a cross section of the centrifugal fan 4.

Here, the air conditioning indoor unit 1 is an indoor unit of a floor-standing air handling unit or an indoor unit of an air conditioner for a computer, and mainly has a casing 2 for housing various devices therein. The air-conditioning indoor unit 1 is not limited to a floor-standing type, and may be another type, for example, a ceiling-mounted type installed on a ceiling, an underfloor-installed type embedded under a floor or fixed to an inner wall And the like.

The casing 2 of the air conditioning indoor unit 1 is a box-like member whose upper surface is open. The casing 2 is formed with a suction port (not shown) for sucking air in the target space into the casing 2 and an outlet 3 for blowing air from the casing 2 into the target space.

The air conditioning indoor unit 1 is disposed in the casing 2 so that the centrifugal fan 4 that sucks and blows the air of the target space into the casing 2 mainly through the suction port and the air flow generated by the centrifugal fan 4 pass And a heat exchanger (not shown). The heat exchanger includes a heat transfer pipe through which a refrigerant and a heat medium (such as water) pass, and exchanges heat between the air flow generated by the centrifugal fan 4 and the refrigerant or heat medium in the heat transfer pipe.

In the present embodiment, the centrifugal fan 4 is a turbo fan. The centrifugal fan 4 has a fan motor 7 and an impeller 8 that rotates in conjunction with the fan motor 7. The impeller 8 is connected to the fan motor 7 via the boss member 9.

In the present embodiment, the centrifugal fan 4 is applied to a general air conditioning indoor unit in connection with being applied to the air conditioning indoor unit 1 (air handling unit or indoor unit of air conditioner for computer). Higher rotation speed and higher output than in the case, and strength is required.

(2) Configuration of the Impeller 8 of the Centrifugal Fan 4 FIG. 3 is a view (as viewed from the shroud 40 side) of the impeller 8 of the centrifugal fan 4 viewed from the direction (rotational axis direction) in which the rotation axis A1 extends. . FIG. 4 is a view of the impeller 8 as viewed from the rotational axis direction (a view from the main plate 30 side). In FIGS. 3 and 4, a two-dot chained arrow “R1” indicates the rotation direction of the impeller 8. FIG. 5 is a view of the impeller 8 of the centrifugal fan 4 as seen from a direction perpendicular to the rotation axis direction. FIG. 6 is a perspective view of the impeller 8 as viewed from the shroud 40 side. FIG. 7 is a perspective view of the impeller 8 as viewed from the main plate 30 side.

The centrifugal fan 4 mainly includes a main plate 30 connected to the fan motor 7 and a plurality of annular members arranged around the rotation axis A1 on the opposite side of the fan motor 7 of the main plate 30 as members constituting the impeller 8 Here, it has seven blades 50 and a ring-shaped shroud 40 disposed to face the main plate 30 so as to sandwich the plurality of blades 50.

(2-1) Main plate 30 (plate)
The main plate 30 is a plate-like member connected to the fan motor 7 and to which a rotational force is transmitted. In the present embodiment, the main plate 30 is made of metal. More specifically, the main plate 30 is made of aluminum (made of aluminum or aluminum alloy) so as to reduce the weight. The main plate 30 is disposed such that the thickness direction is along the rotation axis direction in the installed state. A connection opening 31 for connecting the boss member 9 is formed at the central portion of the main plate 30. The main plate 30 has an annular shape as viewed from the rotation axis direction.

A plurality of (here, eight) holes 32 for passing bolts for fixing the boss members 9 are formed around the connection opening 31 of the main plate 30. The holes 32 are arranged side by side concentrically of the main plate 30. The number of holes 32 can be appropriately changed according to the design specification.

The main plate 30 has a blade-side main plate surface 35 which is a main surface on the blade 50 side (a surface facing the shroud 40), and an opposite blade-side main plate surface 36 which is the main surface opposite to the blade axial direction. And. The main plate 30 is joined at the blade-side main plate surface 35 to the end of the blade 50 (main plate-side shaft end 70).

(2-2) Shroud 40 (Ring)
The shroud 40 is a metal plate-like member that exhibits a ring shape when viewed from the rotational axis direction. In the present embodiment, the shroud 40 is made of aluminum (made of aluminum or aluminum alloy) so as to reduce the weight. In the installed state, the shrouds 40 are spaced from the main plate 30 in the rotational axis direction, and are arranged to sandwich the blades 50 with the main plate 30.

The shroud 40 is configured in a bellmouth shape so as to protrude to the side opposite to the blade 50 along the rotation axis direction. In the installed state, the shroud 40 protrudes while curving toward the suction port 3 a as it goes from the outer peripheral portion to the opening of the central portion. In the present embodiment, the shroud 40 is configured in such a shape by a spatula reduction process.

The shroud 40 configured in such a manner includes a shroud curved plate portion 41 (curved portion) which is a bell-shaped portion, and a shroud flat portion 45 (flat portion) which is a portion extending in a direction perpendicular to the rotation axis A1. ,including. The shroud curved plate portion 41 is curved from an inner end (inner peripheral side) of the shroud flat plate portion 45 and extends along the rotation axis direction.

The shroud 40 has a blade side shroud surface 47 which is a surface on the blade 50 side (that is, a surface facing the main plate 30), and an opposite blade side shroud surface 48 which is a surface opposite to the blade axial surface 47 in the rotational axis direction. ,have. The shroud 40 is joined at the blade side shroud surface 47 to the end of the blade 50 (shroud side shaft end 75).

(2-3) Blade 50
FIG. 8 is a view of the blade 50 viewed from the rotational axis direction (a view viewed from the shroud 40 side). FIG. 9 is a view of the blade 50 viewed from the rotation axis direction (a view viewed from the main plate 30 side). FIG. 10 is a view of the blade 50 as seen from a direction perpendicular to the rotation axis direction. FIG. 11 is a view of the blade 50 as viewed in the opposite direction to FIG.

Each blade 50 is a resin member molded separately from the main plate 30 and the shroud 40. The blade 50 has a three-dimensional wing shape extending along the rotation axis direction while twisting between the main plate 30 and the shroud 40.

FIG. 12 is a schematic view of a cross section of a portion of the blade 50, the main plate 30, and the shroud 40. As shown in FIG. Each blade 50 is disposed between the main plate 30 and the shroud 40. One end on the rotational axis direction side of the blade 50 is a main plate side axial end portion 70 disposed to face the main plate 30, and is fixed (joined) to the main plate 30. In the present embodiment, the main plate side axial end portion 70 is joined to the blade side main plate surface 35 of the main plate 30 by an adhesive 90 (see FIG. 13).

The main plate side axial end portion 70 has a main plate side connection portion 71 which is a flange portion extending along the longitudinal direction at both ends in the short direction as viewed from the rotation axis direction. In the present embodiment, the main plate side connection portion 71 is provided over the entire circumference of the main plate side axial end portion 70. The main plate side connection portion 71 plays a role of increasing the bonding area with the main plate 30. The surface facing the main plate 30 (the blade side main plate surface 35) of the main plate side axial end portion 70 including the main plate side connection portion 71 constitutes a bonding surface (the main plate side bonding surface 701, see FIG. 13) with the main plate 30. That is, the blade 50 has a main plate-side bonding surface 701 and is joined to the main plate 30 (the blade-side main plate surface 35) on the main plate-side bonding surface 701 by an adhesive 90 (a method other than welding).

The other end on the rotational axial direction side of the blade 50 is a shroud side axial end 75 disposed opposite to the shroud 40, and is fixed (joined) to the shroud 40. In the present embodiment, the shroud side shaft end 75 is bonded to the blade side shroud surface 47 of the shroud 40 by an adhesive 90 (see FIG. 13).

The shroud side axial end portion 75 has a shroud side connection portion 76 which is a flange portion extending along the longitudinal direction at both ends in the lateral direction when viewed from the rotational axis direction. In the present embodiment, the shroud side connection portion 76 is provided over the entire circumference of the shroud side shaft end portion 75. The shroud side connection portion 76 plays a role in increasing the bonding area with the shroud 40. The surface facing the shroud 40 (blade-side shroud surface 47) of the shroud-side shaft end 75 including the shroud-side connection 76 constitutes an adhesive surface (shroud-side adhesive surface 751, see FIG. 13) with the shroud 40. That is, the blade 50 has a shroud side adhesive surface 751 and is bonded to the shroud 40 (blade side shroud surface 47) at the shroud side adhesive surface 751. More specifically, the shroud-side adhesive surface 751 of the blade 50 mainly faces the inner side surface (surface on the inner peripheral side) of the shroud flat plate portion 45. That is, the blade 50 is bonded to the inner surface of the flat shroud portion 45 of the shroud 40 by the adhesive 90 (method other than welding).

From such a point of view, such a blade 50 is a bonding portion including a blade main body 60, which is a portion exhibiting a wing shape, and a bonding surface (71, 76) bonded to the main plate 30 or the shroud 40. It can be interpreted as including a portion constituted by the main plate side axial end portion 70 including the main plate side connection portion 71, or a portion constituted by the shroud side axial end portion 75 including the shroud side connection portion 76. According to such an interpretation, the surface area of the connection portion 77 (that is, the area of the main plate side adhesive surface 701 or the shroud side adhesive surface 751) is larger than the cross-sectional area of the blade main body 60. In other words, the surface area of the connection portion 77 facing the main plate 30 or the shroud 40 is larger than the cross-sectional area of the cutting plane perpendicular to the rotation axis direction and the radial direction of the blade body 60.

The blade 50 is configured by combining a separately molded blade first member 51 and a blade second member 52. That is, the blade 50 has a wing shape by combining a plurality of divided members in order to promote the improvement of the assemblability. The blade 50 configured in this manner has a hollow structure, and a hollow space S is formed therein. The hollow configuration of the blade 50 promotes weight reduction.

The blade first member 51 is a portion that mainly constitutes the outer (outer periphery) surface of the blade 50, the main plate side axial end portion 70, and the shroud side axial end portion 75. Mainly, the blade second member 52 is a portion that constitutes the inner surface (inner peripheral side) of the blade 50.

The blade first member 51 and the blade second member 52 are formed separately. In the present embodiment, the blade first member 51 and the blade second member 52 are separately molded by injection molding using a mold (although they may be molded by other methods, respectively). As materials of the blade first member 51 and the blade second member 52, engineering plastic or super engineering plastic (for example, PPE (polyphenylene ether) or PPS (polyphenylene sulfide) or the like) is used in order to secure strength.

(3) Connection Aspect of Blade 50 and Main Plate 30 or Shroud 40 FIG. 13 is an enlarged view schematically showing a joint portion between the blade 50 and the main plate 30 or the shroud 40. Fixing (joining) of the blade 50 to the main plate 30 is performed by bonding the main plate side axial end portion 70 (main plate side bonding surface 701) and the main plate 30 (blade side main plate surface 35) to each other with an adhesive 90. It will be. Fixing (joining) of the blade 50 to the shroud 40 is achieved by bonding the shroud 90 (the shroud side adhesive surface 751) and the shroud 40 (the blade side shroud surface 47) to each other with the adhesive 90. It will be. That is, in the present embodiment, the blade 50 is formed of the main plate 30 by a bonding method other than welding (a bonding method in which a metal base material is heated (or pressed) and melted to integrate two or more members). It is joined to each of the shrouds 40.

Although a well-known thing is used about the adhesive agent 90, what hardens | cures at the temperature which is a grade which the metal main plate 30 or the shroud 40 does not distort is used. In the present embodiment, the adhesive 90 cures at, for example, 300 ° C. or less. That is, the adhesive 90 cures at a temperature lower than the temperature (for example, 500 ° C. or more) related to the heat required at the time of welding.

Asperities are formed on the main plate side adhesive surface 701 and the shroud side adhesive surface 751 in order to increase the bonding area. Such unevenness is formed by a predetermined roughening process (any process for forming the unevenness, for example, a process of forming the unevenness on the surface by applying an electron beam by plasma discharge or corona discharge).

(4) Manufacturing Process of Impeller 8 First, the blade-first member 51 and the blade-second member 52 molded by resin are united by a predetermined method to assemble the blade 50. Then, temporary assembly of the main plate 30 and the shroud 40, which are formed by a predetermined method (such as spatula drawing or press processing), and the plurality of blades 50 is performed.

Then, the connection portion 77 (main plate side bonding surface 701) of the main plate side shaft end portion 70 of the blade 50 is positioned at the bonding position on the blade side main plate surface 35 and bonded using the adhesive 90. Further, the connection portion 77 (shroud side adhesive surface 751) of the shroud side axial end portion 75 of the blade 50 is positioned at the adhesion position on the blade side shroud surface 47 and joined using the adhesive 90. In the step, the adhesive 90 is heated and cured until it reaches a predetermined curing temperature.

The process is repeated until welding between all the blades 50 and the main plate 30 and the shroud 40 is completed.

(5) Characteristics (5-1)
Conventionally, as a member constituting an impeller that rotates in conjunction with a motor, a plate to which the rotational force of the motor is transmitted and a plate are disposed at intervals in the rotational axis direction and exhibit a ring shape when viewed from the rotational axis direction A centrifugal fan is known having a metal ring and a plurality of blades disposed between the plate and the ring and joined to the ring by welding. In such a centrifugal fan, since the metal ring and the blade are joined by welding, it is necessary to secure a large thickness of the ring in order to suppress distortion during welding. In connection with this, the miniaturization of the impeller is restricted.

Further, in the manufacturing process, when the metal ring is deformed by welding, a manual correction operation (for example, drawing with a spatula or the like) is required, which increases economic cost and time cost.

In the centrifugal fan 4 according to the above embodiment, the main plate 30 (plate), a metal shroud 40 (ring), and a plurality of blades 50 are provided as members constituting the impeller 8, and the blades 50 are The other end (shroud side shaft end 75) is joined to the shroud 40 by a joining method (adhesive 90) other than welding.

Thus, by connecting the shroud 40 and each blade 50 by a bonding method (adhesive 90) other than welding, the thickness of the shroud 40 can be reduced compared to the case where both are bonded by welding. It has become possible. That is, in the centrifugal fan 4, heat is not applied so as to distort the shroud 40 when joining the blade 40 and the metal shroud 40 which is particularly distorted (deformable) particularly during welding. Therefore, the thickness of the shroud 40 is smaller than in the case where the shroud 40 and the blades 50 are joined by welding. In connection with this, downsizing of the impeller 8 is promoted, and downsizing of the centrifugal fan 4 is promoted. Further, along with the downsizing of the impeller 8, weight reduction of the centrifugal fan 4 is also promoted. Furthermore, cost reduction is also promoted in connection with the possibility of reducing the thickness of the shroud 40.

(5-2)
In the centrifugal fan 4 according to the above embodiment, the blade 50 is bonded to the shroud 40 by the adhesive 90. This makes it possible to reduce the thickness of the shroud 40 while suppressing the cost.

(5-3)
In the centrifugal fan 4 according to the above-described embodiment, the adhesive 90 is cured at a temperature at which the shroud 40 does not distort. This ensures that no heat is applied to the shroud 40 to distort the joint between the metal shroud 40 and the blade 50. In connection with this, downsizing of the impeller 8 is surely promoted.

(5-4)
In the centrifugal fan 4 according to the above embodiment, the blade 50 has a shroud side adhesive surface 751 (adhesive surface). Unevenness is formed on the shroud side adhesive surface 751. The blade 50 is bonded to the shroud 40 at the shroud side adhesive surface 751. This makes it possible to increase the bonding area. In connection with this, strength improvement is promoted. In particular, the centrifugal fan 4 has a higher rotation speed than that applied to a general air conditioning indoor unit in relation to being applied to the air conditioning indoor unit 1 (air handling unit or indoor unit of a computer air conditioner). -High power, where strength is required, strength improvement is promoted.

(5-5)
In the centrifugal fan 4 according to the above-described embodiment, the blade 50 includes a blade main body 60 (main body) that is a portion exhibiting a wing shape, and a connection portion 77 (adhesive portion) that is a portion bonded to the shroud 40. Have. The surface area of the connection portion 77 facing the shroud 40 (shroud-side adhesive surface 751) is larger than the cross-sectional area of the cut surface perpendicular to the rotation axis direction of the blade body 60. Thereby, it is possible to increase the bonding area, and the strength improvement is promoted.

(5-6)
In the centrifugal fan 4 according to the above embodiment, the shroud 40 is curved from the inner end of the shroud flat portion 45 (flat portion) extending perpendicularly to the rotation axis direction and the inner end of the shroud flat portion 45 in the rotation axis direction And a shroud curved plate portion 41 (curved portion) extending along the same. The blade 50 is joined to the shroud flat plate 45 by mechanical connection.

(5-7)
In the centrifugal fan 4 according to the above embodiment, the blade 50 is made of resin. Thereby, weight reduction of the blade 50 (and the impeller 8) is promoted. Further, in connection with this, the centrifugal force of the blade 50 is reduced, and securing of the strength is promoted.

Further, by using engineering plastic or super engineering plastic as a material of the blade 50, strength improvement is particularly promoted.

(5-8)
In the centrifugal fan 4 according to the embodiment, the blade 50 has a wing shape in which a plurality of divided members (the blade first member 51 and the blade second member 52) are united. Thereby, the manufacturability of the blade 50 is improved.

Moreover, in the centrifugal fan 4 according to the above embodiment, the blade 50 is hollow. Thereby, weight reduction of the blade 50 (and the impeller 8) is promoted. Further, in connection with this, the centrifugal force of the blade 50 is reduced, and securing of the strength is promoted.

(5-9)
In the centrifugal fan 4 according to the above-described embodiment, the shroud 40 is joined to the blade 50 in a state of being formed into a bell mouth shape by spatula reduction processing. That is, the shroud 40 is molded without using a mold. This promotes cost control for the manufacture of the shroud 40.

(5-10)
In the centrifugal fan 4 according to the above embodiment, the shroud 40 is made of aluminum. Thereby, weight reduction of the impeller 8 is promoted.

(5-11)
In the centrifugal fan 4 according to the above embodiment, the main plate 30 is made of metal, and one end (main plate side shaft end 70) of the blade 50 is joined to the main plate 30 by a joining method other than welding. By joining the main plate 30 and the blades 50 by a joining method other than welding, the thickness of the main plate 30 can be reduced compared to the case where both are joined by welding. In connection with this, downsizing of the impeller 8 is possible, and downsizing of the centrifugal fan 4 is promoted.

(5-12)
In the air conditioning indoor unit 1 according to the above embodiment, the downsizing of the centrifugal fan 4 is promoted, and in connection with this, the improvement of the compactness or the assemblability is promoted. Further, in the air conditioning indoor unit 1, the weight reduction of the centrifugal fan 4 is promoted, and in connection with this, the weight reduction or the improvement of the assembling property is promoted. Further, in the air conditioning indoor unit 1, the strength improvement of the centrifugal fan 4 is promoted, and the decrease in reliability is suppressed in connection with this. In particular, the air conditioning indoor unit 1 according to the above-described embodiment is an indoor unit of an air handling unit or an air conditioner for a computer, and the strength of the centrifugal fan 4 is required more than in the case where it is applied to a general air conditioning indoor unit. The strength improvement of the centrifugal fan 4 is promoted.

(6) Modifications The above-described embodiment can be appropriately modified as shown in the following modifications. Each modification may be applied in combination with other modifications as long as no contradiction arises.

(6-1) Modified Example 1
In the above embodiment, the case where the blade 50, and the main plate 30 and the shroud 40 are joined by the adhesive 90 has been described. However, the bonding mode of the blade 50 and the main plate 30 and the shroud 40 can be changed as appropriate.

For example, the blade 50, the main plate 30, and the shroud 40 may be joined in a manner as shown in FIG.

In FIGS. 14 and 15, the blade 50, and the main plate 30 and the shroud 40 are bonded together using the adhesive 90 in the same manner as in the above embodiment, and further mechanically connected (specifically, Are shown for the example (fastened with a screw 80). FIG. 15 is an enlarged view schematically showing a two-dot chain line A portion in FIG.

In the present modification, in the blade 50, screws 80 (female screw 82) are embedded in the main plate side shaft end 70 and the shroud side shaft end 75 of the blade 50, respectively. Further, in the main plate 30 and the shroud 40, a through hole H1 for allowing the screw 80 (male screw 83) to penetrate is formed. The screw 80 is made of metal. In the present modification, the number of the screws 80 and the through holes H1 used in the joint portion on the shroud 40 side or the joint portion on the main plate 30 side may be singular or plural. Further, the positions of the screw 80 and the through hole H1 may be appropriately selected in consideration of the assemblability, the strength, and the like.

In the present variation, the blade 50 is joined to the shroud 40 by mechanical connection (fastening with a screw 80). That is, the blade 50 has a metal screw 80 (first member) fixed to one end, and the blade 50 is joined to the main plate 30 by the mechanical connection via the screw 80. Further, the blade 50 has a metal screw 80 (first member) fixed to the other end, and the blade 50 is joined to the shroud 40 via the screw 80 by a mechanical connection. The same effects as those of the above embodiment can be realized also by this modification. In addition to the bonding by the adhesive 90, the strength is further improved by fastening by the screw 80.

The female screw 82 may be embedded in the main plate 30 and the shroud 40 instead of the blade 50. In such a case, the through hole H1 is formed in the blade 50. Alternatively, the blade 50 and only one of the main plate 30 and the shroud 40 may be mechanically connected (fastened with a screw 80). Further, one or both of the female screw 82 and the male screw 83 are not necessarily limited to metal, and may be made of other materials (for example, resin etc.).

In addition, as long as there is no problem in securing the strength, it may be considered that the blade 50 and the main plate 30 and the shroud 40 are joined only by mechanical connection (fastening with the screw 80). . The same effects as those of the above embodiment can be realized also by such an example. In such a case, as shown in FIG. 16, in the blade 50, both (or one) of the main plate side connection portion 71 and the shroud side connection portion 76 may be omitted.

(6-2) Modification 2
Also, for example, the blade 50, the main plate 30 and the shroud 40 may be joined in a mode as shown in FIG.

In FIG. 17 and FIG. 18, the blade 50, the main plate 30 and the shroud 40 are further bonded mechanically as well as bonded using the adhesive 90 in the same manner as the above embodiment (specifically, Are shown for the example (stiffened with rivets 85). FIG. 18 is an enlarged view schematically showing a two-dot chain line B portion in FIG.

In the present variation, in the blade 50, rivets 85 are embedded in the main plate side shaft end 70 and the shroud side shaft end 75 of the blade 50, respectively. Further, in the main plate 30 and the shroud 40, engagement holes H2 for engaging the rivets 85 are formed. In this modification, the rivets 85 are crushed by applying heat or pressure in a state of being inserted into the engagement holes H2, and the respective portions are crimped. In the present modification, the number of rivets 85 and engagement holes H2 used in the joint portion on the shroud 40 side or the joint portion on the main plate 30 side may be singular or plural. Further, the positions of the rivets 85 and the engagement holes H2 may be appropriately selected in consideration of the assemblability, strength and the like.

In the present variation, the blade 50 is joined to the shroud 40 and the main plate 30 by mechanical connection (stiffened with a rivet 85). That is, the blade 50 has a metal rivet 85 (first member) fixed to one end, and the blade 50 is joined to the main plate 30 by the mechanical connection via the rivet 85. Further, the blade 50 has a metal rivet 85 (first member) fixed to the other end, and the blade 50 is joined to the shroud 40 via the rivet 85 by a mechanical connection. The same effects as those of the above embodiment can be realized also by this modification. Further, the strength is further improved by caulking with the rivets 85 in addition to the bonding with the adhesive 90.

The rivets 85 may be embedded in the main plate 30 and the shroud 40 instead of the blades 50. In such a case, the engagement hole H2 is formed in the blade 50. Alternatively, the blade 50 and only one of the main plate 30 and the shroud 40 may be mechanically connected (swaged with the rivet 85). Moreover, the rivet 85 is not necessarily limited to metal, and may be made of other materials (for example, resin etc.).

In addition, as long as there is no problem in securing the strength, an example may be considered in which the blade 50 and the main plate 30 and the shroud 40 are joined only by mechanical connection (scaching with the rivet 85). The same effects as those of the above embodiment can be realized also by such an example. In such a case, as shown in FIG. 19, in the blade 50, both (or one) of the main plate side connection portion 71 and the shroud side connection portion 76 may be omitted.

(6-3) Modified Example 3
Also, for example, the blade 50, the main plate 30 and the shroud 40 may be joined in a mode as shown in FIG.

In FIGS. 20 and 21, the blade 50, and the main plate 30 and the shroud 40 are bonded together using the adhesive 90 in the same manner as in the above embodiment, and further mechanically connected (specifically, Is illustrated for the example (scaulked at the convex part 86). FIG. 21 is an enlarged view schematically showing a two-dot chain line C portion in FIG.

In the present modification, the blade 50 is provided with convex portions 86 at the main plate side axial end portion 70 and the shroud side axial end portion 75 of the blade 50, respectively. Further, in the main plate 30 and the shroud 40, a concave portion 87 for engaging the convex portion 86 is formed. In the present modification, the convex portion 86 is crimped to the edge portion of the concave portion 87 by being subjected to heat or pressure while being inserted into the concave portion 87. The term "squeezed" here also includes the case of being fitted. Further, in the present modification, the number of the convex portions 86 and the concave portions 87 used in the joint portion on the shroud 40 side or the joint portion on the main plate 30 side may be singular or plural. In addition, the positions of the convex portion 86 and the concave portion 87 may be appropriately selected in consideration of the assemblability, the strength, and the like.

In the present variation, the blade 50 is joined to the shroud 40 and the main plate 30 by mechanical connection (stiffened by the projection 86). That is, the convex portion 86 is formed on the blade 50, the concave portion 87 is formed on the shroud 40, and the blade 50 is joined to the shroud 40 by being crimped in a state where the convex portion 86 is engaged with the concave portion 87. The same effects as those of the above embodiment can be realized also by this modification. Further, in addition to the bonding by the adhesive 90, the strength is further improved by caulking with the convex portion 86.

Note that, instead of the concave portion 87, an opening may be formed to allow the convex portion 86 to penetrate, and the opening may have the same function as the concave portion 87. Further, the convex portion 86 may be provided not on the blade 50 but on the main plate 30 and the shroud 40. In such a case, a recess 87 is formed in the blade 50. Alternatively, the blade 50 and only one of the main plate 30 and the shroud 40 may be mechanically connected (swaged with the protrusion 86).

In addition, as long as there is no problem in securing the strength, an example may be considered in which the blade 50 and the main plate 30 and the shroud 40 are connected only by mechanical connection (scaching with the convex portion 86). . The same effects as those of the above embodiment can be realized also by such an example. In such a case, as shown in FIG. 22, in the blade 50, both (or one) of the main plate side connection portion 71 and the shroud side connection portion 76 may be omitted.

(6-4) Modification 4
Also, for example, the blade 50, the main plate 30 and the shroud 40 may be joined in a mode as shown in FIG.

FIGS. 23 and 24 show an example in which the blade 50, the main plate 30 and the shroud 40 are bonded together with the adhesive 90 in the same manner as in the above embodiment and are further welded. FIG. 24 is an enlarged view schematically showing a two-dot chain line D portion in FIG.

In the present modification, welds 88 are formed at the joint between the blade 50 and the main plate 30 and at the joint between the blade 50 and the shroud 40. The welding portion 88 is a recess which penetrates the main plate 30 or the shroud 40 and reaches a part of the main plate side shaft end 70 or the shroud side shaft end 75. The welding portion 88 is formed by a predetermined welding method (for example, ultrasonic welding which heats or pressurizes by ultrasonic vibration, laser welding which heats by laser light, or the like). In the present modification, the number of welds 88 used in the joint portion on the shroud 40 side or the joint portion on the main plate 30 side may be singular or plural. Further, the position and formation of the welded portion 88 may be appropriately selected in consideration of the assemblability, strength and the like.

In the present variation, the blade 50 is joined to the shroud 40 by welding. Also, the blade 50 is joined to the main plate 30 by welding. The same effects as those of the above embodiment can be realized also by this modification. In addition to bonding with the adhesive 90, welding is performed to further improve the strength.

The blade 50 and only one of the main plate 30 and the shroud 40 may be joined by welding.

Further, as long as there is no problem in securing the strength, an example may be considered in which the blade 50, the main plate 30 and the shroud 40 are joined only by welding. The same effects as those of the above embodiment can be realized also by such an example. In such a case, as shown in FIG. 25, in the blade 50, both (or one) of the main plate side connection portion 71 and the shroud side connection portion 76 may be omitted.

(6-5) Modification 5
The concept of the modified examples 1-4 is applicable as shown in FIGS. FIG. 26 is a perspective view of an impeller 8 'of the present modification as viewed from the shroud 40 side. FIG. 27 is a perspective view of an impeller 8 'of the present modification viewed from the main plate 30 side.

In the present modification, instead of the main plate side connection portion 71 and the shroud side connection portion 76, a flange 89 extending perpendicularly to the rotation axis direction and facing the main plate 30 or the shroud 40 is provided. In this modification, in each blade 50, a plurality of (here, three) flanges 89 are provided on the inner peripheral side and the outer peripheral side of the main plate side shaft end 70 and the shroud side shaft end 75, respectively. And, in each flange 89, adhesion with the adhesive 90 as shown in the above embodiment, fastening with the screw 80 as shown in the modification 1, caulking fixation with the rivet 85 as shown in the modification 2, shown in the modification 3 It is assumed that either or all of the caulking and fixing by the convex portions 86 and welding as shown in the fourth modification are performed.

FIG. 28 shows the case where fastening (mechanical connection) with a screw 80 as shown in the first modification is performed at each flange 89. In FIG. 28, in the two-dot chain line A portion, fastening by the screw 80 is performed in the same manner as the A portion in FIG. 14 and FIG. In the example shown in FIG. 28, each idea described in the first modification is applicable.

FIG. 29 shows a case where caulking (mechanical connection) by rivets 85 as shown in the second modification is performed at each flange 89. In FIG. 29, at the two-dot chain line B portion, caulking fixation by the rivet 85 is performed in the same manner as the B portion in FIG. 17 and FIG. In the example shown in FIG. 29, each thought described in the modification 2 is applicable.

FIG. 30 shows a case where caulking (mechanical connection) by the convex portion 86 as shown in the third modification is performed in each flange 89. At the two-dot chain line C portion in FIG. 30, caulking fixation by the convex portion 86 is performed in the same manner as the C portion in FIG. 20 and FIG. In the example shown in FIG. 30, each thought described in the third modification is applicable.

FIG. 31 shows the case where welding as shown in the fourth modification is performed at each flange 89. At the two-dot chain line D portion in FIG. 31, caulking fixation by the convex portion 86 is performed in the same manner as the D portion in FIG. 23 and FIG. In the example shown in FIG. 31, each idea described in the modification 4 is applicable.

In this modification, the blade 50 has a flange 89 facing the main plate 30 at one end, and is joined to the main plate 30 at the flange 89 by adhesive connection, mechanical connection or welding. The blade 50 has a flange 89 facing the shroud 40 (the inner surface of the flat shroud 45) at the other end, and is joined to the shroud 40 at the flange 89 by adhesive connection, mechanical connection or welding. The same operational effects as those of the above embodiment can be realized also by such a modification.

In the present modification, any one of the bonding methods of the above-described embodiment and the modification 1-4 may be combined and applied. For example, any of the bonding methods of the above-described embodiment and the modification 1-4 may be selectively applied to each flange 89, and the bonding method applied to each flange 89 may be different.

Further, in the main plate side shaft end 70 or the shroud side shaft end 75, the number of the flanges 89 provided on the inner peripheral side and the outer peripheral side is not necessarily three, but may be four or more. , May be two or less. Further, in the main plate side shaft end 70 or the shroud side shaft end 75, the number of the flanges 89 provided on the inner peripheral side and the number of the flanges 89 provided on the outer peripheral side do not necessarily have to be the same. Further, the number of flanges 89 provided on the main plate side shaft end 70 and the number of flanges 89 provided on the shroud side shaft end 75 need not necessarily be the same. Further, the position and the shape of the flange 89 may be appropriately selected in consideration of the assembling property and the strength.

(6-6) Modification 6
In the above embodiment, the case where the main plate side shaft end 70 and the shroud side shaft end 75 are included in the blade first member 51 has been described. However, one or both of the main plate side shaft end 70 and the shroud side shaft end 75 may be included in the blade second member 52. That is, one or both of the main plate side shaft end 70 and the shroud side shaft end 75 may be configured by the blade second member 52.

(6-7) Modified Example 7
The formation aspects (position, shape, size, etc.) of the main plate side connection part 71 and the shroud side connection part 76 are not necessarily limited to the aspects in the above embodiment, and can be appropriately changed according to the design specification, etc. It is.

(6-8) Modified Example 8
In the above embodiment, with regard to the material of the blade 50, the case where engineering plastic or super engineering plastic is used has been described. The blade 50 is preferably configured in such a manner from the viewpoint of promoting strength improvement while promoting weight reduction. However, the blade 50 may be configured in another manner as long as no problem occurs in securing the strength.

For example, one and the other of the blade first member 51 and the blade second member 52 may be made of other resins (for example, ABS, ASG, etc.). In addition, one or the other of the blade first member 51 and the blade second member 52 does not necessarily have to be made of resin, and may be made of another material (for example, metal). The blade first member 51 and the blade second member 52 may be made of different materials.

(6-9) Modified Example 9
In the above embodiment, the case where the main plate 30 is made of aluminum has been described. However, the material of the main plate 30 does not necessarily have to be aluminum or an aluminum alloy, and another metal (for example, a steel-based material) may be used. Also, the main plate 30 does not necessarily have to be made of metal, and may be made of another material (for example, resin etc.).

(6-10) Modified Example 10
In the above embodiment, the case where the shroud 40 is made of aluminum has been described. However, the material of the shroud 40 does not necessarily have to be aluminum or an aluminum alloy, and another metal (for example, a material such as a steel-based material) may be used.

(6-11) Modified Example 11
In the above embodiment, the blade 50 is configured by combining a plurality of divided members (the blade first member 51 and the blade second member 52). The blade 50 is preferably configured in such a manner from the viewpoint of improving the assemblability. However, the blade 50 does not have to be configured in such a manner. For example, blade 50 may be molded as a single piece. In such a case, the hollowing of the blade 50 may be realized by a predetermined method (for example, blow molding).

(6-12) Modified Example 12
In the above embodiment, the blade 50 has a hollow structure so that the space S is formed therein. From this point of view, from the viewpoint of weight reduction, the blade 50 is preferably configured in such a manner. However, the blade 50 does not necessarily have to be hollow and may be configured to have a solid structure.

(6-13) Modified Example 13
In the above embodiment, the centrifugal fan 4 is described to have seven blades 50. However, the number of blades 50 can be changed as appropriate, and may be eight or more, or six or less.

(6-14) Modified Example 14
In the above embodiment, the case where the adhesive 90 which is cured at 300 ° C. or less is used has been described. However, the adhesive 90 is not necessarily limited to this, as long as the metal members (the shroud 40 and the main plate 30 in this case) cure at a temperature that does not distort, those that cure in other temperature ranges are used It is also good. For example, as the adhesive 90, one that cures at 400 ° C. or less may be used.

(6-15) Modified Example 15
In the above embodiment, a turbo fan is employed as the centrifugal fan 4. However, the centrifugal fan to which the concept of the present disclosure can be applied is not necessarily limited to the turbo fan. For example, the idea of the present disclosure is also applicable to sirocco fans.

(6-16) Modified Example 16
The said embodiment demonstrated the case where the centrifugal fan 4 was applied to the air-conditioning indoor unit 1 (air handling unit and the indoor unit of the air conditioner for computers). However, the centrifugal fan 4 is also applicable to other devices. For example, the centrifugal fan 4 may be applied to an indoor unit / outdoor unit of a general air conditioner, an air cleaner, a ventilator, a dehumidifier, or the like.

(7)
While the embodiments have been described above, it will be appreciated that various changes in form and detail can be made without departing from the spirit and scope of the claims.

The present disclosure is applicable to an air conditioning indoor unit having a centrifugal fan or a centrifugal fan.

1: Air conditioning indoor unit 2: Casing 4: Centrifugal fan 7: Fan motor (motor)
8, 8 ': impeller 9: boss member 30: main plate (plate)
31: Connection opening 35: Blade side main plate surface 36: Anti blade side main plate surface 40: Shroud (ring)
41: Shroud curved plate (curved portion)
45: Shroud flat portion (flat portion)
47: Blade side shroud surface 48: Non-blade side shroud surface 50: Blade 51: Blade first member (divided member)
52: Blade second member (divided member)
60: Blade main body (main body)
70: Main plate side shaft end (one end of blade)
71: Main plate side connection portion 75: Shroud side shaft end portion (the other end of the blade)
76: Shroud side connection part 77: Connection part (bonded part)
80: Screw (first member)
82: Female screw 83: Male screw 85: Rivet (first member)
86: convex portion 87: concave portion 88: welded portion 89: flange 90: adhesive 701: main plate side adhesive surface 751: shroud side adhesive surface (adhesive surface)
A1: rotation axis H1: through hole H2: engagement hole S: space

Japanese Patent Application Laid-Open No. 60-18243

Claims

As a member constituting an impeller (8, 8 ') that rotates in conjunction with the motor (7),
A plate (30) arranged so that the thickness direction is along the rotation axis (A1) direction, to which the rotational force of the motor is transmitted;
A metallic ring (40) which is spaced apart from the plate and in the direction of the axis of rotation and presents a ring shape as viewed from the direction of the axis of rotation;
A plurality of blades (50) disposed between the plate and the ring, one end (70) joined to the plate and the other end (75) joined to the ring by a joining method other than welding;
Equipped with
Centrifugal fan (4).
The blade is bonded to the ring by an adhesive (90)
A centrifugal fan (4) according to claim 1.
The adhesive cures at a temperature at which the ring does not distort.
A centrifugal fan (4) according to claim 2.
The blade has an adhesive surface (751) with irregularities formed by roughening, and is bonded to the ring at the adhesive surface.
Centrifugal fan (4) according to claim 2 or 3.
The blade has a main body (60) which is a portion exhibiting a wing shape, and a bonding portion (77) which is a portion bonded to the ring;
The surface area of the bonding portion facing the ring is larger than the cross-sectional area of the cut surface perpendicular to the rotation axis direction of the main body portion.
A centrifugal fan (4) according to any one of the preceding claims.
The blade is joined by mechanical connection with the ring
A centrifugal fan (4) according to any one of the preceding claims.
The blade has a flange (89) extending perpendicularly to the rotational axis and facing the ring at the other end and joined at the flange by mechanical connection with the ring.
A centrifugal fan (4) according to claim 6.
The blade has a first metal member fixed to the other end, and is joined to the ring by a mechanical connection via the first member.
A centrifugal fan (4) according to claim 6 or 7.
The ring includes a flat portion (45) extending perpendicularly to the rotation axis direction, and a bending portion (41) which curves from the inner end of the flat portion and extends along the rotation axis direction.
The blade is joined by mechanical connection with the flat portion.
A centrifugal fan (4) according to any of the claims 6-8.
The blade is formed with one of a recess (87) or opening and a protrusion (86).
The ring is formed with the other of the recess or the opening and the protrusion.
The blade is joined to the ring by caulking in a state where the convex portion penetrates or engages the recess or the opening.
A centrifugal fan (4) according to any one of the claims 6-9.
The blade is made of resin.
11. A centrifugal fan (4) according to any one of the preceding claims.
The blade has a plurality of divided members (51, 52) combined into a wing shape and is hollow.
A centrifugal fan (4) according to any one of the preceding claims.
The ring is joined with the blade in a state of being formed into a bell mouth shape by a spatula drawing process.
13. A centrifugal fan (4) according to any one of the preceding claims.
The ring is made of aluminum,
14. A centrifugal fan (4) according to any one of the preceding claims.
The plate is made of metal and
The blade is joined at one end to the plate by a joining method other than welding.
A centrifugal fan (4) according to any one of the preceding claims.
An air conditioning indoor unit (1) comprising the centrifugal fan (4) according to any one of the preceding claims.