Impeller, radial fan and interior unit

Abstract

An impeller according to an embodiment of the present disclosure comprises a reinforcing rim located on a first side of an axial direction of a rotational axis with respect to a base, and several blades, wherein the reinforcing rim has several projecting receptacles which are open to a second side, which is a side of the axial direction opposite to the first side, wherein the several blades each have a projection which extends from a blade body to the first side, wherein the projection of the several blades is received in each of the several projecting receptacles, wherein the projecting receptacles each have a first receptacle and a second receptacle which is connected at one end in the extension direction of the first receptacle, wherein the projection has a first projection which is received in the first receptacle and is attached to the reinforcing rim.and has a second projection which is connected to an end in the extension direction of the first projection and is received in the second receptacle, wherein the first projection is in contact with and attached to a surface of an inner surface of the first receptacle located on the first side, and wherein the second projection faces a surface of an inner surface of the second receptacle located on the first side over a gap.

Description

Technical area

[0001] The present disclosure relates to an impeller, a radial fan and an indoor unit. State of the art

[0002] A radial fan with an impeller / fan wheel is known. For example, as described in Patent Document 1, an impeller is described that includes a shaped side plate to which a mounting recess for one end of a hollow blade is attached. Citation listPatent document

[0003] Patent Document 1: Unexamined Japanese Application No. 2005-155510, First Publication Brief description of the inventionProblem to be solved by the invention

[0004] As in the above impeller, in order for one end of a hollow blade to be in close contact with an inner surface of a mounting groove so that the hollow blade is fixed to a side plate, a gap is provided between a portion of the hollow blade other than the portion in contact with the inner surface of the mounting groove and the side plate. Through this gap, an airflow is formed from a positive pressure side of the hollow blade to a negative pressure side of the hollow blade, and there is a problem of reduced air blowing efficiency through the impeller.

[0005] The present disclosure has been made to solve the above problem, and it is an object to provide a centrifugal blower including an impeller, the impeller having a configuration that suppresses reduced air blowing efficiency, and an air conditioner including said blower. Means of solving the problem

[0006] An impeller / blower wheel according to an embodiment of the present disclosure is rotatable about a rotation axis and comprises a base; a reinforcement rim located on a first side of an axial direction of the rotation axis with respect to the base; and a plurality of blades located in the axial direction between the base and the reinforcement rim and arranged with a distance between them in a rotation direction of the impeller, wherein the reinforcement rim has a reinforcement rim main body and a plurality of protruding receptacles which protrude from the reinforcement rim main body to the first side and which are open to a second side, which is a side of the axial direction opposite to the first side, wherein the plurality of blades each have a blade main body and a protrusion which protrudes from the blade main body to the first side, wherein a first end of the blade main body in an extension direction,in which the blade main body extends from the axial direction, in a radial direction whose center is the rotation axis, further inward than a second end of the blade main body in the extension direction, wherein the projection of the plurality of blades is received in each of the plurality of projecting receptacles, wherein the projecting receptacles each have a first receptacle and a second receptacle which is connected to one end in the extension direction of the first receptacle, wherein the projection has a first projection which is received in the first receptacle and is fastened to the reinforcing edge, and a second projection which is connected to one end in the extension direction of the first projection and is received in the second receptacle, and wherein the first projection is in contact with and fastened to a surface of an inner surface of the first receptacle on the first side,and wherein the second projection of a surface located on the first side faces an inner surface of the second receptacle across a gap.,

[0007] A radial fan according to an embodiment of the present disclosure may include the impeller described above and a drive section that rotates the impeller about the rotation axis.

[0008] An indoor unit according to an embodiment of the present disclosure may include the above-described centrifugal fan and a heat exchanger having air blown by the centrifugal fan. Effect of the invention

[0009] According to the present invention, it is possible to suppress a reduced air blowing efficiency of an impeller in a radial fan. Short description of the drawings Fig. 1 is a schematic view showing a configuration overview of an air conditioner of a first embodiment. Fig. 2 is a perspective view showing the indoor unit of the first embodiment. Fig. 3 is a cross-sectional view showing the indoor unit of the first embodiment. Fig. 4 is a perspective view showing an impeller of the first embodiment. Fig. 5 is a view showing the impeller as viewed from a bottom side according to the first embodiment. Fig. 6 is a cross-sectional view showing a protruding receptacle and a projection of the first embodiment and a cross-sectional line VI-VI in Fig. 5 is taken. Fig. 7 is a perspective view showing the projecting receptacle of the first embodiment. Fig. 8 is a perspective view showing a blade of the first embodiment. Fig. 9 is a cross-sectional view showing a part of the impeller of the first embodiment and taken along the cross-sectional line IX-IX in Fig. 5 is taken. Fig. 10 is a cross-sectional view showing a part of the impeller of the first embodiment and the cross-sectional line XX in Fig. 5 is taken. Fig. 11 is a perspective view showing a part of an impeller of a second embodiment. Fig. 12 is a view showing a part of the impeller as seen from the bottom according to the second embodiment. Fig. 13 is a perspective view showing a part of an impeller of a third embodiment. Fig. 14 is a cross-sectional view showing a part of the impeller of the third embodiment. Fig. 15 is a perspective view showing a part of the blade of the third embodiment. Fig. 16 is a perspective view showing a part of an impeller of a fourth embodiment. Fig. 17 is a cross-sectional view showing a part of an impeller of a comparative example. Fig. 18 is a cross-sectional view showing a part of the impeller of the comparative example and corresponding to a cross-sectional line XVIII-XVIII in Fig. 17 is taken. Description of embodiments

[0010] Hereinafter, embodiments of the present disclosure will be explained with reference to the drawings. The scope of the present disclosure is not limited to the embodiments below and may vary as long as the embodiments do not depart from the technical scope of the present disclosure. In the drawings below, the scales and sizes of various configurations may differ from the scales and sizes in the drawings below to facilitate a better understanding of the various embodiments.

[0011] The drawings show a Z-axis where appropriate. The Z-axis indicates a vertical direction. A side of a vertical direction Z toward which a Z-axis arrow points (+Z side) is referred to as a "top side," and a side of the vertical direction Z away from which the Z-axis arrow points (-Z side) is referred to as a "bottom side." In the embodiments below, the vertical direction Z corresponds to a rotation axis R, which will be described later. The bottom side of an axial direction of the rotation axis R corresponds to a "first side," and the top side, which is a side of the axial direction of the rotation axis R opposite the first side, corresponds to a "second side." First embodiment

[0012] Fig. 1 is a schematic view showing a configuration overview of an air conditioner 100 of a first embodiment. As shown in Fig. As shown in Figure 1, the air conditioner 100 includes an indoor unit 10, an outdoor unit 20, and a circulation path 30. The indoor unit 10 is arranged indoors. The outdoor unit 20 is arranged outdoors. The indoor unit 10 and the outdoor unit 20 are connected via the circulation path 30, in which a refrigerant 33 circulates. The indoor unit 10 and the outdoor unit 20 are heat exchange units that perform heat exchange with the air.

[0013] The air conditioner 100 adjusts the temperature of the indoor air by performing heat exchange between the refrigerant 33 flowing within a circulation path 30 and the indoor air where the indoor unit 10 is located. A refrigerant such as a fluorine-based refrigerant with a low global warming potential (GWP), a hydrocarbon-based refrigerant, or the like can be cited as examples of the refrigerant 33.

[0014] The outdoor unit 20 has a compressor 21, a heat exchanger 23, a flow adjustment valve 24, a fan 25, and a four-way valve 22. The compressor 21, the heat exchanger 23, the flow adjustment valve 24, and the four-way valve 22 are connected by the circulation path 30.

[0015] The four-way valve 22 is provided at a portion of the circulation path 30 connected to an output of the compressor 21. By replacing a portion of the circulation path 30, the four-way valve 22 can reverse a flow direction of the refrigerant 33 within the circulation path 30. When the path connected by the four-way valve 22 is the path of the four-way valve 22, which is in Fig. 1 by solid lines, the refrigerant 33 flows within the circulation path 30 in the direction shown in Fig. 1 is shown by the arrow with a solid line. On the other hand, if the path connected by the four-way valve 22 is the path of the four-way valve 22, which is in Fig. 1 by dashed lines, the refrigerant 33 flows within the circulation path 30 in the direction shown in Fig. 1 is shown by the arrow with a dashed line.

[0016] The indoor unit 10 comprises a housing 11, a heat exchanger 14, and a radial fan 40. The indoor unit 10 can have a cooling mode in which the indoor air in which the indoor unit 10 is arranged is cooled. It is possible to have a heating mode in which the indoor air in which the indoor unit 10 is arranged is heated.

[0017] When the indoor unit 10 operates in the cooling operation, the refrigerant 33 flowing in the circulation path 30 flows in the direction shown in Fig. 1 is shown by the solid line. In other words, when the indoor unit 10 is operated in the cooling mode, the refrigerant 33 flowing in the circulation path 30 circulates to return to the compressor 21 after passing through the compressor 21, the heat exchange device 23 of the outdoor unit 20, the flow adjustment valve 24, and the heat exchanger 14 of the indoor unit 10 in this order. During the cooling mode, the heat exchange device 23 of the outdoor unit 20 functions as a condenser, and the heat exchanger 14 of the indoor unit 10 functions as an evaporator.

[0018] On the other hand, when the indoor unit 10 operates in the heating operation, the refrigerant 33 flowing in the circulation path 30 flows in the direction shown in Fig. 1 is shown by the dashed line. In other words, when the indoor unit 10 is operating in the heating mode, the refrigerant 33 flowing in the circulation path 30 circulates to return to the compressor 21 after passing through the compressor 21, the heat exchanger 14 of the indoor unit 10, the flow adjustment valve 24, and the heat exchange device 23 of the outdoor unit 20 in this order. During the heating mode, the heat exchange device 23 of the outdoor unit 20 functions as the evaporator, and the heat exchanger 14 of the indoor unit 10 functions as the condenser.

[0019] Next, the indoor unit 10 of the first embodiment will be explained in more detail. Fig. 2 is a perspective view showing the indoor unit 10. Fig. 3 is a cross-sectional view showing the indoor unit 10. As shown in Fig. 2 and Fig. 3, the indoor unit 10 of the first embodiment is a ceiling-mounted indoor unit which is provided to be mounted in a ceiling. As shown in Fig. As shown in Figure 3, the casing 11 includes the heat exchanger 14 and the centrifugal fan 40. The casing 11 has a casing main body 12 that houses the heat exchanger 14 and the centrifugal fan 40 inside, and a decorative panel 13 that is mounted below the casing main body 12. The casing main body 12 is installed embedded in the ceiling of an indoor space where the indoor unit 10 is installed. The decorative panel 13 is exposed in the indoor space where the indoor unit 10 is installed.

[0020] The heat exchanger 14 is housed in the housing main body 12. Air is supplied to the heat exchanger 14 by the radial fan 40. The heat exchanger 14 has a frame shape surrounding the radial fan 40. The heat exchanger 14 is arranged to face an air outlet opening 60b, which will be described later.

[0021] The indoor unit 10 has an inlet opening 10a and an outlet opening 10b. The inlet opening 10a and the outlet opening 10b are open to a lower surface of the decorative panel 13. As shown in Fig. As shown in Figure 2, the inlet port 10a is located at a center of the indoor unit 10 when viewed from the vertical direction Z. A plurality of outlet ports 10b are provided. The plurality of outlet ports 10b are arranged to surround the inlet port 10a when viewed from the vertical direction Z. Four outlet ports 10b are provided.

[0022] The radial fan 40 is a fan that supplies air to the heat exchanger 14. Through the operation of the radial fan 40, air flows into the interior of the indoor unit 10. Arrows AF in Fig. 3 show the air flow generated during operation of the radial fan 40. As in Fig. 3 by the arrows AF, when the radial fan 40 is operating, air is introduced into the interior of the indoor unit 10 through the inlet opening 10a. Air introduced into the interior of the indoor unit 10 through the inlet opening 10a flows through the heat exchanger 14 and is discharged into the interior from the four outlet openings 10b.

[0023] The radial fan 40 is mounted on a lower surface of a ceiling panel 12a of the housing 12. The radial fan 40 includes a drive section 50 and an impeller 60. The drive section 50 causes the impeller 60 to rotate about the rotation axis R. The rotation axis R, shown in the drawings as appropriate, is a theoretical axis extending in the vertical direction Z. In other words, the axial direction of the rotation axis R is the vertical direction Z. The rotation axis R passes through a center of the indoor unit 10 when viewed from the vertical direction Z.

[0024] Unless otherwise specified, hereinafter, a radial direction centered on the rotation axis R is simply referred to as a "radial direction," and a circumferential direction around the rotation axis R is referred to as a "circumferential direction." Where appropriate, a rotation direction is shown in the drawings by an arrow θ. The impeller 60 rotates in the direction pointed by the arrow θ. A side (+θ side) of the rotation direction toward which the arrow θ points is a "front side," and an opposite side (-θ side) of the rotation direction, away from which the arrow θ points, is a "rear side." The front side of the rotation direction (+θ side) is a side that advances when said side rotates counterclockwise with the rotation axis R as the center as viewed from the bottom side.The reverse side of the rotation direction (-θ side) is a side that advances when said side rotates clockwise with the rotation axis R as the center as viewed from the bottom.

[0025] In the first embodiment, the drive section 50 is a motor. The drive section 50 includes a drive section main body 51 fixed to the lower surface of the ceiling panel 12a, and a rotation shaft 52 projecting from the interior of the drive section main body 51 to the lower surface further than the drive section main body 51. The rotation shaft 52 is a portion of a rotor in the drive section 50. The rotation shaft 52 is rotatable about the rotation axis R. As long as the impeller 60 is allowed to rotate about the rotation axis R, a configuration of the drive section 50 is not limited to a specific configuration.

[0026] The impeller 60 is rotatable about the rotation axis R. The impeller 60 is formed, for example, from resin. The impeller 60 is fixed via a connecting member 53 to a portion of the rotating shaft 52 of the drive section 50 that protrudes further toward the bottom than the drive section main body 51. The connecting member 53 is a cylindrically shaped member whose center is the rotation axis R. The connecting member 53 is fixed to an outer peripheral surface of the rotating shaft 52. Fig. 4 is a perspective view showing the impeller 60. Fig. 5 is a view showing the Impeller 60 from the bottom side. As in Fig. 3 to Fig. 5, the impeller 60 includes a base 61, a reinforcing rim 62, and a plurality of blades 63.

[0027] The base 61 is attached to the rotary shaft 52 via the connecting element 53. As shown in Fig. As shown in Figure 4, the base 61 has a circular plate 61a, a protrusion 61b, and a plurality of guides 61f. The circular plate 61a has a shape of a circular plate whose center is the rotation axis R. The protrusion 61b protrudes from an inner peripheral edge in the radial direction of the circular plate 61a to the bottom. The protrusion 61b has a tubular shape whose center is the rotation axis R. As shown in Fig. As shown in Figure 3, the drive section main body 51 is located on an inner side of the recess 61b. The recess 61b has a peripheral wall 61c, a bottom plate 61d, and a cylinder 61e.

[0028] The peripheral wall 61c is open to the top and has a cylindrical shape whose center is the rotation axis R. An inner diameter of the peripheral wall 61c and an outer diameter of the peripheral wall 61c decrease toward the bottom. The bottom plate 61d is connected to a lower end of the peripheral wall 61c. The bottom plate 61d has a circular plate shape whose center is the rotation axis R. The cylinder 61e protrudes from a radially inner peripheral edge of the bottom plate 61d toward the bottom. The cylinder 61e is open to the bottom and has a cylindrical shape whose center is the rotation axis R. The connecting member 53 is fixed to an inner peripheral surface of the cylinder 61e. The cylinder 61e is fixed to the rotation shaft 52 via the connecting member 53.

[0029] As in Fig. As shown in Fig. 4, the plurality of guides 61f are formed on a lower surface of the circular plate 61a. The plurality of guides 61f extend so as to be oblique with respect to the radial direction along the rotation direction, and are long, thin half-U shapes, open to an outside of the radial direction, as viewed from the vertical direction Z. The plurality of guides 61f are located on the front side of the rotation direction (+θ side) toward an inside of the radial direction. The plurality of guides 61f are arranged with a distance therebetween over a circumference in the rotation direction. In the first embodiment, seven guides 61f are provided. Distances between the guides 61f may be equal or different.

[0030] The reinforcement rim 62 is separately arranged on the underside of the circular plate 61a of the base 61. In other words, the reinforcement rim 62 is located on the underside (the first side) of directions in the axial direction of the rotation axis R with respect to the base 61. The reinforcement rim 62 has a circular shape, the center of which is the rotation axis R. A radially inner edge of the reinforcement rim 62 is located farther outward in the radial direction than the bulge 61b. The reinforcement rim 62 has a cylindrical shape open on both sides of the vertical direction Z, the center of which is the rotation axis R. An inner diameter of the reinforcement rim 62 and an outer diameter of the reinforcement rim 62 decrease toward the underside. The reinforcement rim 62 has a reinforcement rim main body 62a and a plurality of protruding recesses 64.

[0031] The reinforcing edge main body 62a has a cylindrical shape which is open on both sides of the vertical direction Z and whose center is the rotation axis R. An inner diameter of the reinforcing edge main body 62a and an outer diameter of the reinforcing edge main body 62a become smaller toward the bottom. As shown in Fig. 3, in a cross section orthogonal to the rotation direction, a shape of the reinforcing edge main body 62a is an arc shape extending inward in the radial direction and in an oblique-upward direction.

[0032] A radially inner edge of the reinforcement rim main body 62a is a lower end of the reinforcement rim main body 62a. The inner edge of the reinforcement rim main body 62a is an air intake port 60a open to the bottom. The air intake port 60a is separately arranged on top of the intake port 10a of the indoor unit 10.

[0033] A radially outer edge of the reinforcing edge main body 62a is an upper end of the reinforcing edge main body 62a. As shown in Fig. 4, a plurality of air outlet openings 60b, which are open to the outside in the radial direction, are formed by the plurality of blades 63, which divide a space in the vertical direction Z between the radially outer edge of the reinforcing edge main body 62a and a radially outer edge of the circular plate 61a. The plurality of air outlet openings 60b are arranged circumferentially in the rotation direction with a distance between each other. In the first embodiment, seven air outlet openings 60b are provided. As shown in Fig. As shown in Figure 3, the heat exchanger 14 is arranged to face the air outlet openings 60b from the outside in the radial direction of the air outlet openings 60b. The distances between the plurality of air outlet openings 60b may be equal or different.

[0034] When the impeller 60 is driven by the drive section 50 to rotate about the rotation axis R, air drawn into the indoor unit 10 through the air inlet port 10a flows from the air inlet port 60a into the interior of the impeller 60. The air flowing into the interior of the impeller 60 is discharged from the plurality of air outlet ports 60b in the radial direction to the outside. The air discharged from the plurality of air outlet ports 60b flows through the heat exchanger 14 and is discharged from the plurality of outlet ports 10b into the interior.

[0035] Fig. Fig. 6 is a cross-sectional view showing a projecting receptacle 64 and a projection 66, which will be described later, and corresponding to the cross-sectional line VI-VI in Fig. 5 is taken. Fig. 7 is a perspective view showing the projecting receptacle 64. As in Fig. 6 and Fig. 7, the plurality of projecting receptacles 64 protrude from the reinforcing edge main body 62a to the bottom. As shown in Fig. 6, the plurality of projecting receptacles 64 are hollow. The plurality of projecting receptacles 64 are open to the top. As shown in Fig. 5, the plurality of protruding receptacles 64 each extend so as to be oblique with respect to the radial direction when viewed from the vertical direction Z along the rotation direction. A radially inner end of each protruding receptacle 64 is located further toward the front (+θ side) in the rotation direction than radially outer ends of each protruding receptacle 64. The protruding receptacles 64 each extend in a straight line which is oblique in a direction toward the front in the rotation direction and inward in the radial direction when viewed from the vertical direction Z.

[0036] From the perspective of the vertical direction Z, a direction in which the protruding receptacles 64 extend is an extension direction in which a blade main body 65 described later extends. In the explanations below, a direction in which the blade main body 65 extends is referred to as the "extension direction." A side that is the inner side of the extension direction in the radial direction is referred to as an "inside of the extension direction." A side that is the outer side of the extension direction in the radial direction is referred to as an "outside of the extension direction." The inner side of the extension direction is a side that is the inner side of the radial direction and the front side (+θ side) of the rotation direction. The outer side of the extension direction is a side that is the outer side of the radial direction and the back side (-θ side) of the rotation direction.For example, the left side is in . Fig. 6 the inside of the extension direction, and the right side in Fig. 6 is the outside of the extension direction.

[0037] As in Fig. 6 and Fig. As shown in Fig. 7, the plurality of projecting receptacles 64 each have a first receptacle 64a. The first receptacle 64a is a semi-rectangular box that extends in the direction in which the projecting receptacle 64 extends. The first receptacle 64a has an outer portion 64c and an inner portion 64d. The outer portion 64c is a portion of the first receptacle 64a that extends outward in the extending direction. The inner portion 64d is a portion of the first receptacle 64a that extends inward in the extending direction. An extending outer end of the outer portion 64c is an extending outer end of the first receptacle 64a. An extending inner end of the inner portion 64d is the extending inner end of the first receptacle 64a. The outer portion 64c is located farther outward in the radial direction than the inner portion 64d.The inner portion 64d is connected to the inner end of the outer portion 64c in the direction of extension.

[0038] A lower end of the outer portion 64c is located higher than a lower end of the inner portion 64d. The outer portion 64c is arranged at a location that is recessed upward relative to the inner portion 64d. By recessing the outer portion 64c upward, interference between the projecting receptacle 64 and other parts arranged on the underside outside the radial direction of the reinforcing edge 62 can be prevented. As shown in Fig. 6, a side wall portion 64e extends outside the extending direction of the outer portion 64c from the reinforcing edge main body 62a in the vertical direction Z. A stepped wall portion 64g between the outer portion 64c and the inner portion 64d is slanted along the extending direction in which the protruding receptacle 64 extends in the vertical direction Z. The stepped wall portion 64g is located inward toward its lower side in the extending direction.

[0039] The plurality of protruding receptacles 64 each have the inner receptacle 64b. The inner receptacle 64b is a second receptacle connected to one end in the extending direction of the first receptacle 64a. The inner receptacle 64b is connected to an inner end in the extending direction of the first receptacle 64a. More specifically, the inner receptacle 64b is connected to the inner end in the extending direction of the inner portion 64d. Therefore, in the first embodiment, the protruding receptacles 64 each have, as the second receptacle, the inner receptacle 64b connected to a radially inner end of the two ends in the extending direction of the first receptacle 64a. An inner end in the extending direction of the inner receptacle 64b is an inner end in the extending direction of the protruding receptacle 64. The inner receptacle 64b has a box shape that is open at the top.An inner side of the inner receptacle 64b is connected to an inner side of the first receptacle 64a.

[0040] A lower end of the inner receptacle 64b is located higher than the lowermost portion of the first receptacle 64a. The lowermost portion of the first receptacle 64a of the first embodiment is the lower end of the inner portion 64d. A lower end of the inner receptacle 64b is recessed upwardly further than the lower end at an inner end of the inner portion 64d in the extension direction. A stepped wall portion 64h between the inner receptacle 64b and the first receptacle 64a extends in the vertical direction Z.

[0041] As in Fig. 5 and Fig. 7, the inner receptacle 64b has a semi-triangular shape when viewed from the vertical direction Z. As shown in Fig. As shown in Figure 6, a side wall portion 64f of the inner side of the extending direction of the inner receptacle 64b is inclined along the extending direction with respect to the vertical direction Z. The side wall portion 64f is located toward the outside of the extending direction toward its lower side. The side wall portion 64f extends along an inner protrusion 66b, which will be described later.

[0042] As in Fig. 4, the plurality of blades 63 are located between the base 61 and the reinforcing rim 62 in the vertical direction Z. More specifically, the plurality of blades 63 are located between the circular plate 61a and the reinforcing rim 62 in the vertical direction Z. The plurality of blades 63 are connected to the base 61 and to the reinforcing rim 62. The plurality of blades 63 are arranged with a distance between them in the rotation direction of the impeller 60. The plurality of blades 63 are arranged with a distance between them over a circumference of the rotation direction. In the first embodiment, seven blades 63 are provided. Distances between the blades 63 may have the same size or may have different sizes.

[0043] Fig. 8 is a perspective view showing a blade 63. As in Fig. As shown in Fig. 8, the blade 63 is configured from a first blade element 63a and a second blade element 63b, which are combined in a direction orthogonal to the extension direction and the vertical direction Z. The first blade element 63a has a flat box shape that opens outward in the radial direction. The second blade element 63b is a plate that blocks an opening of the first blade element 63a on the outside of the radial direction. The first blade element 63a and the second blade element 63b are fixed to each other using, for example, ultrasonic welding. Fig. Fig. 9 is a cross-sectional view showing a part of the impeller 60 and the cross-sectional line IX-IX in Fig. 5. As in Fig. 9, a gap is provided between the first blade element 63a and the second blade element 63b. In the first embodiment, the plurality of blades 63 are hollow blades. As shown in Fig. 9, a direction of air flow upon rotation of the impeller 60 is the direction shown by arrows AF.

[0044] The first blade element 63a forms one of the surfaces of the blade 63 that is inclined inward in the radial direction. One of the surfaces of the blade 63 in the first embodiment that is directed inward in the radial direction is a negative pressure surface 63m. As shown in Fig. As shown in FIG. 4, the negative pressure surface 63m is directed inward in the radial direction and toward the rear (-θ side) of the rotation direction. The second blade element 63b is located on the outer side in the radial direction of the first blade element 63a. The second blade element 63b forms a part of the surface of the surfaces of the blade 63 that faces outward in the radial direction. One surface of the surfaces of the blade 63 in the first embodiment that faces outward in the radial direction is the positive pressure surface 63p. The positive pressure surface 63p is directed outward in the radial direction and toward the front (+θ side) of the rotation direction.

[0045] The plurality of blades 63 each have the blade main body 65. The blade main body 65 extends in a direction that is oblique with respect to the radial direction when viewed from the vertical direction Z along the rotation direction. From the vertical direction Z, the blade main body 65 is located toward the front of the rotation direction (+θ side) toward its inner side in the radial direction. As explained above, the direction in which the blade main body 65 extends is the extension direction when viewed from the vertical direction Z.

[0046] A first end in the extending direction of the blade main body 65 is located further inward in the radial direction centered on the rotation axis R and further forward in the rotation direction (+θ side) than a second end in the extending direction of the blade main body 65. The first end in the extending direction of the blade main body 65 of the first embodiment is a radially inner end of the blade main body 65 and a front end (+θ side) in the rotation direction of the blade main body 65. The second end in the extending direction of the blade main body 65 of the first embodiment is a radially outer end of the blade main body 65 and the rear end (-θ side) in the rotation direction of the blade main body 65.

[0047] The blade main body 65 is located in the vertical direction Z between the circular plate 61a of the base 61 and the reinforcing edge 62. As shown in Fig. As shown in Fig. 9, an upper end of the blade main body 65 is connected to a lower surface of the circular plate 61a and fixed to the lower surface of the circular plate 61a. The upper end of the blade main body 65 is fixed to the lower surface of the circular plate 61a by laser welding, for example. The upper end of the blade main body 65 is located on an inner side of the guide 61f. A side surface at the upper end of the blade main body 65 is arranged separately from an inner surface of the guide 61f. The upper end of the blade main body 65 is not in contact with the guide 61f.

[0048] As in Fig. As shown in Fig. 8, the plurality of blades 63 each have the projection 66 projecting from the blade main body 65 to the lower side. The projection 66 extends in the extending direction. More specifically, the projection 66 extends in a direction in which a lower end 65a of the blade main body 65 extends from the vertical direction Z. The direction in which the projection 66 extends is the same direction in which the projecting receptacle 64 extends. As shown in Fig. 6, the projection 66 of each of the blades 63 is received in one of the plurality of projecting receptacles 64.

[0049] The projection 66 has a first protrusion 66a. The first protrusion 66a is housed in the first receptacle 64a. The first protrusion 66a has a semi-rectangular shape extending in the extension direction. The first protrusion 66a is hollow. The first protrusion 66a contacts and is fixed to a lower surface of the inner surfaces of the first receptacle 64a. Therefore, the first protrusion 66a is fixed to the reinforcing rim 62. The lower surface of the inner surfaces of the first receptacle 64a is a surface facing the upper side. A lower surface of the first protrusion 66a is fixed to the lower surface of the surfaces of the first receptacle 64a, for example, by laser welding. In the first embodiment, the portion of the first protrusion 66a fixed to the first receptacle 64a is a part of the first blade element 63a.The portion of the first projection 66a that is attached to the first receptacle 64a may be part of the second blade element 63b.

[0050] The first projection 66a has an outer portion 66c, which is received in the outer portion 64c of the first receptacle 64a, and an inner portion 66d, which is received in the inner portion 64d of the first receptacle 64a. The outer portion 66c is an extensionally outer portion of the first projection 66a. The inner portion 66d is an extensionally inner portion of the first projection 66a. The inner portion 66d is connected to an extensionally inner end of the outer portion 66c. The extensionally outer end of the outer portion 66c is an extensionally outer end of the first projection 66a. The extensionally inner end of the inner portion 66d is an extensionally inner end of the first projection 66a. As shown in Fig. 8, the outer end of the outer portion 66c in the extension direction is farther from the inner side of the extension direction than the outer end of the lower end 65a of the blade main body 65 in the extension direction.

[0051] As in Fig. As shown in Figure 6, a lower end of the outer portion 66c is in contact with and secured to a lower surface of an inner surface of the outer portion 64c of the first receptacle 64a. The lower end of the outer portion 66c is located higher than a lower end of the inner portion 66d. The lower end of the inner portion 66d is in contact with and secured to a lower surface of the inner surface of the inner portion 64d of the first receptacle 64a.

[0052] An outer sidewall portion 66e of the outer portion 66c extends downward in the vertical direction Z from the lower end 65a of the blade main body 65. The sidewall portion 66e is arranged on the inner side of the sidewall portion 64e of the protruding receptacles 64 in the extension direction. The sidewall portion 66e faces the sidewall portion 64e across a gap. The sidewall portion 66e is not in contact with the sidewall portion 64e.

[0053] A stepped wall portion 66g between the outer portion 66c and the inner portion 66d extends in the vertical direction Z. The stepped wall portion 66g is arranged to extend inwardly of the extending direction of the stepped wall portion 64g of the protruding receptacle 64. The stepped wall portion 66g faces the stepped wall portion 64g across a gap. The stepped wall portion 66g is not in contact with the stepped wall portion 64g.

[0054] A side wall portion 66h on the inner side in the extending direction of the inner portion 66d extends downward from the lower end 65a of the blade main body 65 in the vertical direction Z. A lower end of the side wall portion 66h is located on the outer side in the extending direction of the stepped wall portion 64h of the projecting receptacle 64. The side wall portion 66h faces the stepped wall portion 64h across a gap. The side wall portion 66h is not in contact with the stepped wall portion 64h.

[0055] The plurality of projections 66 each have the inner projection 66b. The inner projection 66b is a second projection connected to an inner end of the first projection 66a in the extension direction. As shown in Fig. As shown in Fig. 8, the inner protrusion 66b is connected to an extending-direction inner end of the first protrusion 66a. More specifically, the inner protrusion 66b is connected to an inner end of the inner portion 66d, in other words, to the sidewall portion 66h. Therefore, in the first embodiment, the plurality of protrusions 66 each have, as the second protrusion, the inner protrusion 66b connected to a radially inner end of the two ends in the extending direction of the first protrusion 66a. The extending-direction inner end of the inner protrusion 66b is the extending-direction inner end of the protrusion 66.

[0056] The inner protrusion 66b protrudes downward from an outer edge of a lower surface of an inner end portion 65b, which is located on the inner side in the radial direction, further than the first protrusion 66a protrudes from the lower end 65a of the blade main body 65. The inner protrusion 66b and the inner end portion 65b of the first embodiment are parts of the first blade element 63a. The inner protrusion 66b and the inner end portion 65b may be parts of the second blade element 63b. The inner protrusion 66b protrudes downward from an edge of the inner side in the radial direction and an edge of the front side (+θ side) of the rotation direction of the outer edge on the lower surface of the inner end portion 65b.The inner protrusion 66b has a shape, as viewed from the vertical direction Z, which extends inward from an edge of the inner side of the radial direction of the side wall portion 66h of the first protrusion 66a in the extending direction and is curved toward the outer side of the radial direction.

[0057] A bottom end of the inner protrusion 66b is located higher than the bottom-most portion of the first protrusion 66a. In the first embodiment, the bottom-most portion of the first protrusion 66a is the lower end of the inner portion 66d. The bottom end of the inner protrusion 66b is located lower than the lower end of the outer portion 66c.

[0058] One of the ends in the extending direction of the inner protrusion 66b, which is on a side opposite to the side connected to the first protrusion 66a, in other words, the extending-direction inner end, is smoothly connected to an extending-direction inner end of the blade main body 65. A surface on the inner side of the extending direction of the inner protrusion 66b is smoothly connected to a surface on the inner side of the extending direction of the blade main body 65. A surface on the inner side of the radial direction of the inner protrusion 66b is smoothly connected to the negative pressure surface 63m of the blade main body 65.

[0059] As in Fig. 6, the inner protrusion 66b is received in the inner receptacle 64b. The inner protrusion 66b faces a lower surface of an inner surface of the inner receptacles 64b with a gap therebetween. A lower end of the inner protrusion 66b is separately disposed on the upper side of a lower surface of the inner surface of the inner receptacle 64b. The inner protrusion 66b is located on the outer side in the extending direction of the side wall portion 64f of the inner receptacle 64b. The inner protrusion 66b is disposed to face the side wall portion 64f via a gap. The gap between the inner protrusion 66b and the side wall portion 64f is smaller than the gap between the inner protrusion 66b and the lower surface of the inner surface of the inner receptacle 64b. The entire inner protrusion 66b is separately disposed from the inner surface of the inner receptacle 64b.The inner projection 66b is not in contact with the inner surface of the inner receptacle 64b.

[0060] Fig. Fig. 10 is a cross-sectional view showing a part of the impeller 60 and the cross-sectional line XX in Fig. 5. In Fig. 10, an air flow during rotation of the impeller 60 is shown by the arrows AF. As in Fig. As shown in Fig. 10, a gap G1 is formed between the inner end portion 65b of the blade main body 65 and the reinforcement rim 62. The gap G1 is connected to an interior of the positive pressure side facing the positive pressure surface 63p and an interior of the negative pressure side facing the negative pressure surface 63m. The gap G1 includes the gap between the inner projection 66b and an inner surface of the inner receptacle 64b, an inner space of the inner receptacle 64b, and the gap between the inner end portion 65b and the reinforcement rim main body 62a. By interposing the gap G1 between the interior of the inner receptacle 64b and the inner projection 66b, a labyrinth structure extending in the vertical direction Z is formed.

[0061] Fig. 17 is a cross-sectional view showing a part of an impeller 560 of a comparative example. Fig. Fig. 18 is a cross-sectional view showing a part of the impeller 560 of the comparative example and corresponding to a cross-sectional line XVIII-XVIII in Fig. 17. A direction of the air flow during rotation of the impeller 560 is shown in Fig. 18 by the arrows AF. As in Fig. 17 and Fig. As shown in Figure 18, except for an aspect of a protruding recess 564 that lacks the inner recess 64b, a reinforcing rim 562 of the impeller 560 of the comparative example is the same as the reinforcing rim 62 of the impeller 60 of the first embodiment. Except for an aspect of a protrusion 566 that lacks the inner projection 66b, a blade 563 of the impeller 560 is the same as the blade 63 of the impeller 60 of the first embodiment.

[0062] A gap G2 is provided between the inner end portion 65b of the blade main body 65 and an inner surface of the surface of the reinforcing edge main body 62a. As shown in Fig. As shown in Figure 18, the gap G2 is provided so as to extend along an inner surface of the reinforcing edge main body 62a in the radial direction. The gap G2 is open on both sides in the radial direction and is connected to the region of the positive pressure side, toward which the positive pressure surface 63p faces, and to the negative pressure side, toward which the negative pressure surface 63m faces. As indicated by the arrows AF in Fig. Therefore, as shown in Figure 18, in the impeller 560 of the comparative example, there are cases where the air flows from the positive pressure side region, to which the positive pressure surface 63p faces, to the negative pressure side region, to which the negative pressure surface 63m faces, through the gap G2. Therefore, there is a problem of a decrease in air blowing efficiency in the impeller 560.

[0063] Regarding the problem, the plurality of protruding receptacles 64 in the reinforcing rim 62 according to the first embodiment each have the first receptacle 64a and the inner receptacle 64b connected to the end in the extending direction of the first receptacle 64a. The protrusion 66 of the blade 63 is received in the first receptacle 64a, is connected to the first projection 66a connected to the reinforcing rim 62 and one end in the extending direction of the first projection 66a, and has the inner projection 66b received in the inner receptacle 64b. The first projection 66a contacts and is fixed to a lower surface of the inner surfaces of the first receptacle 64a. The inner projection 66b opposes the lower surface of the inner surface of the inner receptacle 64b via a gap.Therefore, by providing the inner housing 64b and the inner protrusion 66b received in the inner housing 64b, it is possible to make the gap G1 between the inner end portion 65b of the blade main body 65 and the reinforcing rim main body 62a have the above-described continuous shape. Accordingly, it can be made difficult for air to flow through the gap G1. Accordingly, it can be prevented from flowing from the positive pressure side region, to which the positive pressure surface 63p faces, to the negative pressure side region, to which the negative pressure surface 63m faces, via the gap G1. Therefore, it is possible to suppress the decrease in the air blowing efficiency of the impeller 60 in the radial fan 40.Because the inner projection 66b is not in contact with the lower surface of the inner surface of the inner receptacle 64b, it is possible for the first projection 66a to be in appropriate contact with the lower surface of the inner surface of the first receptacle 64a.

[0064] According to the first embodiment, the plurality of protruding receptacles 64 each includes, as the second receptacle, the inner receptacle 64b connected to the radially inner end of the two ends in the extending direction of the first receptacle 64a. The protrusion 66 includes, as the second projection, the inner projection 66b connected to a radially inner end of the two ends in the extending direction of the first projection 66a. The inner projection 66b is received in the inner receptacle 64b. Therefore, it is possible to prevent the air flow from the positive pressure side to the negative pressure side on the inner side in the extending direction of the first projection 66a.Because a portion on the inner side in the extending direction of the blade 63 separates the air introduced through the air intake port 60a, it is particularly easy for the positive pressure in the air on the positive pressure side to increase. Therefore, by preventing the air flow from the positive pressure side to the negative pressure side on the inner side in the extending direction of the first protrusion 66a, it is possible to appropriately prevent the decrease in the air blowing efficiency of the impeller 60.

[0065] According to the first embodiment, the lower end of the inner housing 64b is located higher than the lowermost portion of the first housing 64a. A lower end of the inner projection 66b is located higher than the lowermost portion of the first projection 66a. Therefore, even if the inner housing 64b and the inner projection 66b are provided, the inner housing 64b would not protrude further downward than the first housing 64a. Therefore, it is possible to prevent the inner housing 64b from becoming an obstacle to the airflow during rotation of the impeller 60. In addition, when the first projection 66a and the first housing 64a are welded, for example, a glass plate or the like is pressed against the first housing 64a from the lower side, and the lower surface of the first projection 66a and the lower surface of the inner surface of the first housing 64a are in close contact with each other.In such a case, by ensuring that the inner receptacle 64b does not protrude downwardly any further than the first receptacle 64a, it is possible to appropriately press the glass plate or the like against the first receptacle 64a. Therefore, it is possible to appropriately fasten the first projection 66a and the first receptacle 64a using laser welding.

[0066] According to the first embodiment, the entire inner protrusion 66b is arranged separately from the inner surface of the inner seat 64b. In other words, the inner protrusion 66b is not in contact with the inner surface of the inner seat 64b. Therefore, when a small vibration is generated in the blade 63, it is possible to prevent contact of the vibrating inner protrusion 66b with the inner surface of the inner seat 64b. Accordingly, it is possible to prevent the generation of noise during rotation of the impeller 60. In the first embodiment, portions of the blade 63 that are not fixed by laser welding are not in contact with the reinforcing rim 62. Therefore, it is possible to more appropriately prevent vibrating portions of the blade 63 from coming into contact with the reinforcing rim 62 and more appropriately prevent the generation of noise during rotation of the impeller 60.

[0067] According to the first embodiment, among the ends in the extending direction of the inner protrusion 66b, one end on the side opposite the first protrusion 66a side is seamlessly connected to the end in the extending direction of the blade main body 65. Therefore, no step is formed between the inner protrusion 66b and the blade main body 65, and no gap is formed between said step and the reinforcing rim main body 62a. Accordingly, air does not flow from the positive pressure side to the negative pressure side via the gap between said step and the reinforcing rim main body 62a. Therefore, it is possible to appropriately suppress a decrease in the air blowing efficiency of the impeller 60. Second embodiment

[0068] Fig. 11 is a perspective view showing a part of an impeller 260 of a second embodiment. Fig. 12 is a view showing the part of the impeller 260 viewed from the bottom according to the second embodiment. In the explanations below, configurations similar to those of the previously described embodiments are denoted by the same reference numerals, and their descriptions are omitted.

[0069] As in Fig. 11 and Fig. As shown in FIG. 12, a reinforcing rim 262 of an impeller 260 has a cover portion 267 protruding from the bottom of the reinforcing rim main body 62a. The cover portion 267 extends from the outer side in the radial direction of the inner receptacle 64b to the front side (+θ side) in the rotation direction, and is curved inward in the radial direction, covering the inner receptacle 64b from the front side in the rotation direction. One end of the cover portion 267 at the rear side (-θ side) in the rotation direction is connected to a radially outer end of the inner end in the extending direction of the first receptacle 64a.

[0070] As in Fig. 11, a lower end of the cover portion 267 is located further down than the lower end of the inner receptacle 64b. The lower end of the cover portion 267 is arranged at the same position in the vertical direction Z as the lower end of the inner portion 64d of the first receptacle 64a. As shown in Fig. As shown in Figure 12, the cover portion 267 is connected to the outer side in the radial direction of the inner receptacle 64b. A portion of the cover portion 267 forms a wall of the outer side in the radial direction of the inner receptacle 64b. An upper end of the cover portion 267 along an outer surface of the reinforcing edge main body 62a is located at the lower side toward its inner side in the radial direction. A size of the cover portion 267 in the vertical direction Z becomes smaller toward the inner side in the radial direction of the cover portion 267.

[0071] Other configurations of the reinforcement rim 262 are the same as the other configurations of the reinforcement rim 62 of the first embodiment. Other configurations of the impeller 260 are the same as the other configurations of the impeller 260 of the first embodiment.

[0072] According to the second embodiment, the reinforcement rim 262 has the cover portion 267 projecting downward from the reinforcement rim main body 62a. A lower end of the cover portion 267 is located lower than the lower end of the inner receiver 64b. The cover portion 267 extends from the outer side in the radial direction of the inner receiver 64b to the front side (+θ side) in the rotation direction, while being curved inward in the radial direction and covering the inner cover 64b from the front side in the rotation direction. Therefore, when the impeller 260 rotates, it is possible to block the air from the front side in the rotation direction using the cover portion 267, and it is possible to prevent the air from the front side in the rotation direction from colliding with the inner receiver 64b. Accordingly, it is also possible to prevent noise generation upon rotation of the impeller 260.

[0073] According to the second embodiment, the cover portion 267 is connected to the outer side of the inner receptacle 64b in the radial direction. Compared with the case where the cover portion 267 is formed separately from the inner receptacle 64b, forming the cover portion 267 and the inner receptacle 64b together is easier. Accordingly, it is possible to easily form the cover portion 267. Third embodiment

[0074] Fig. 13 is a perspective view showing a part of an impeller 360 of a third embodiment. Fig. 14 is a cross-sectional view showing the part of the impeller 360 of the third embodiment. Fig. 15 is a perspective view showing a part of a blade 363 of the third embodiment. In the explanations below, configurations similar to those of the previously described embodiments are denoted by the same reference numerals, and their descriptions are omitted.

[0075] As in Fig. 13 and Fig. As shown in Fig. 14, a protruding socket 364 in a reinforcing rim 362 of the third embodiment has, as a second socket, an outer socket 364i connected to a radially outer end of both ends in the extending direction of the first socket 64a. The outer socket 364i is connected to the extending-direction outer end of the outer portion 64c. The outer socket 364i extends in the extending direction and is a semi-rectangular box open upward. A lower end of the outer socket 364i is located higher than the lower end of the outer portion 64c of the first socket 64a. Other configurations of the reinforcing rim 362 are the same as the other configurations of the reinforcing rim 62 of the first embodiment.

[0076] As in Fig. 14 and Fig. As shown in Fig. 15, a projection 366 of the blade 363 of the third embodiment has, as a second projection, an outer projection 366i connected to a radially outer end of the two ends in the extending direction of the first projection 66a. The outer projection 366i is connected to an extending-direction outer end of the outer portion 66c. The outer projection 366i has a semi-rectangular shape extending in the extending direction. The outer projection 366i of the third embodiment is a solid part.

[0077] As in Fig. As shown in Fig. 14, the outer projection 366i is received on an inner side of the outer receptacle 364i. A lower end of the outer projection 366i is located higher than a lower end of the outer portion 66c of the first projection 66a. The outer projection 366i faces a lower surface of an inner surface of the outer receptacle 364i via a gap. Other configurations of the blade 363 are the same as the other configurations of the blade 63 of the first embodiment. Other configurations of the impeller 360 are the same as the other configurations of the impeller 60 of the first embodiment.

[0078] According to the third embodiment, the protruding receptacle 364 includes, as the second receptacle, the outer receptacle 364i connected to a radially outer end of the two ends in the extending direction of the first receptacle 64a. The protrusion 366 includes, as a second projection, the outer protrusion 366i connected to a radially outer end of the two ends in the extending direction of the first projection 66a. The outer protrusion 366i is received on the inner side of the outer receptacle 364i. Therefore, it is possible to prevent the air on the outside in the extending direction of the first projection 66a from flowing from the positive pressure side to the negative pressure side. Accordingly, it is possible to appropriately prevent a decrease in the air blowing efficiency of the impeller 360. Fourth embodiment

[0079] Fig. 16 is a perspective view showing a part of an impeller 460 of a fourth embodiment. In the explanations below, configurations similar to those of the previously described embodiments are denoted by the same reference numerals, and their descriptions are omitted.

[0080] As in Fig.As shown in Fig. 16, a reinforcing edge 462 of the impeller 460 of the fourth embodiment has a configuration in which the cover portion 267 is provided, unlike the previously described reinforcing edge 362 of the third embodiment. Although omitted from the drawings, a blade of the fourth embodiment is the same as the blade 363 of the third embodiment. Accordingly, various effects described in the second embodiment and the third embodiment can be obtained by the fourth embodiment. Other configurations of the impeller 460 are the same as the other configurations of the impeller 60 of the first embodiment.

[0081] Although embodiments of the present disclosure have been explained above, the present disclosure is not limited to configurations of the embodiments, and the configurations and methods below can be applied.

[0082] As a second receptacle, a protruding receptacle in a reinforcing rim may be an inner receptacle and / or an outer receptacle. In other words, the protruding receptacle in the reinforcing rim may have only an outer receptacle as the second receptacle. For example, in the aforementioned third and fourth embodiments, the inner receptacle 64b need not be provided. A protruding height of the second receptacle is not particularly limited. An end of the first side (the bottom side) of the second receptacle is at the same location in the axial direction (the vertical direction Z) as the portion furthest on the first side of the first receptacle, or may be at the same location as a portion of the first receptacle that is forward of the portion furthest on the first side. The second receptacle may have any shape as long as said shape can accommodate a second projection.

[0083] The first receptacle of the protruding receptacle can have any shape as long as it can accommodate the first protrusion therein. Although the first receptacle 64a in the above-described embodiments has configurations in which the heights of the outer portion 64c and the inner portion 64d are different from each other, the first receptacle 64a is not limited to this. The first receptacle need not have a portion with a different height and may have three or more portions, each with a different protrusion height.

[0084] The protrusion in the blade has at least one of an inner protrusion and an outer protrusion as the second protrusion. In other words, the protrusion in the blade may have only the outer protrusion as the second protrusion. For example, in the third and fourth embodiments described above, the inner protrusion 66b need not be provided. The height of the second protrusion is not particularly limited. An end of a first side (the bottom side) of the second protrusion is at the same position in the axial direction (the vertical direction Z) as the portion, which is furthest on the first side, of the first protrusion, or may be at the same location as a portion of the first protrusion which is forward of the portion, which is furthest on the first side. The second protrusion may have any shape.For example, the shape of the inner protrusion 66b in the various embodiments described above may be the same as the outer protrusion 366i of the third embodiment. As long as the second protrusion faces a surface on the first side of the inner surface of the second receptacle via a gap, the second protrusion may have a portion that contacts the inner surface of the second receptacle.

[0085] As long as the first protrusion of the first projection is fixed to the first receptacle, the first protrusion can have any shape. Although the first protrusion 66a in the various embodiments described above has a configuration in which protrusion heights of the outer portion 66c and the inner portion 66d are different from each other, the first protrusion 66a is not limited to this. The first protrusion need not have portions having different protrusion heights from each other, and may have three or more portions having different protrusion heights. Parts other than parts of the first protrusion that are fixed to the first receptacle may be in contact with the inner surface of the first receptacle. The first protrusion may be fixed to the reinforcing edge by methods other than laser welding.

[0086] The cover portion of the reinforcement rim need not be connected to the inner receptacle and need not be connected to the first receptacle. A number of blades and a number of projections of the reinforcement rim are not particularly limited. A shape of a blade main body is not particularly limited. The blade main body may extend in the axial direction (the vertical direction Z) in any manner. A layout relationship between a first blade element and a second blade element constituting the blade may be a layout relationship opposite to the layout relationship of the above-described embodiments. In other words, the second blade element may face a negative pressure side. Each blade may be an integrally formed solid blade.The axial direction of the rotation direction of an impeller of the present disclosure is not particularly limited and may extend in a direction other than the vertical direction. The impeller of the present disclosure may be mounted on any fan. A centrifugal fan of the present embodiment may be mounted on any device.

[0087] The various configurations and various methods explained in the above description can be combined as required as long as there are no conflicts between them with technical scopes thereof. List of reference symbols 10 Indoor unit 14 heat exchangers 40 radial fans 50 drive section 60, 260, 360, 460, 560 impellers 61 Base 62, 262, 362, 462, 562 reinforcement edge 62a Reinforcing edge main body 63, 363, 563 shovel 64, 364, 564 protruding recording 64a first recording 64b inner shot (second shot) 65 Blade main body 66, 366, 566 overhang 66a first ledge 66b inner projection (second projection) 100 air conditioning 267 deck section 364i exterior shot 366i outer overhang R rotation axis Z vertical direction (axial direction) QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2005-155510

[0003]

Claims

[1] Impeller, which impeller is rotatable about an axis of rotation, the impeller comprising: a base; a reinforcing edge located on a first side of an axial direction of the rotation axis with respect to the base, and a plurality of blades which are located in the axial direction between the base and the reinforcing edge and are arranged with a distance between them in a rotation direction of the impeller, where the reinforcing edge a reinforcing edge main body and has a plurality of projecting receptacles which project from the reinforcing edge main body to the first side and which are open to a second side, which is a side of the axial direction opposite to the first side, wherein the plurality of blades each a blade main body and have a projection which projects from the blade main body to the first side, wherein a first end of the blade main body in an extension direction in which the blade main body extends from the viewpoint of the axial direction is located further inward in a radial direction whose center is the rotation axis than a second end of the blade main body in the extension direction, wherein the projection of the plurality of blades is received in one of the plurality of projecting receptacles, The protruding images are a first recording and have a second receptacle which is connected to one end in the direction of extension of the first receptacle, where the supernatant a first projection which is received in the first receptacle and is attached to the reinforcing edge, and a second projection which is connected to one end in the extension direction of the first projection and is received in the second receptacle, and wherein the first projection is in contact with and secured to a first-side surface of an inner surface of the first receptacle, and wherein the second projection of a surface located on the first side faces an inner surface of the second receptacle across a gap. [2] Impeller according to claim 1, wherein the plurality of protruding receptacles each have, as the second receptacle, an inner receptacle which is connected to a radially inner end of the two ends in the extension direction of the first receptacle, wherein the projection has, as the second projection, an inner projection which is connected to a radially inner end of the two ends in the extending direction of the first projection, and wherein the inner projection is received in the inner receptacle. [3] Impeller according to claim 2, wherein the first end in the extension direction of the blade main body is located further inward in the radial direction and further at a front side in the rotation direction than the second end in the extension direction of the blade main body, wherein the reinforcing edge has a cover portion which projects from the reinforcing edge main body to the first side, wherein an end of the first side of the cover portion is further than the end of the first side of the inner receptacle on the first side, and wherein the cover portion extends with a curvature inward in the radial direction from an outer side in the radial direction of the inner receptacle to the front side in the rotation direction and covers the inner receptacle from the front side in the rotation direction. [4] The impeller according to claim 3, wherein the cover portion is connected to the outer side in the radial direction of the inner receptacle. [5] Impeller according to one of claims 1 to 4, wherein the projecting receptacle has, as a second receptacle, an outer receptacle which is connected to an end located on an outer side in the radial direction of the two ends in the extension direction of the first recess, wherein the projection has, as a second projection, an outer projection which is connected to an end lying on the outside in the radial direction of the two ends in the extension direction of the first projection, and whereby the outer projection is accommodated in the outer receptacle. [6] Impeller according to one of claims 1 to 5, wherein an end of the first side of the second recording is further on the second side than a portion of the first recording furthest on the first side, and wherein an end on the first side of the second projection is further on the second side than a portion of the first projection furthest on the first side. [7] Impeller according to one of claims 1 to 6, wherein the entire second projection is arranged separately from an inner surface of the second receptacle. [8] The impeller according to any one of claims 1 to 7, wherein one end of ends in the extending direction of the second projection, which is on a side opposite to the side to which the first projection is connected, is continuously connected to the first end in the extending direction of the blade main body. [9] Radial fan, comprising: the impeller according to one of claims 1 to 8 and a drive section which rotates the impeller around the rotation axis. [10] Indoor unit comprising: the radial fan according to claim 9 and a heat exchanger which has air which is blown by the radial fan.

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