fan

Abstract

A blower includes: a motor including a motor shaft; a centrifugal fan connected to the motor shaft and rotated about an axis of the motor shaft by the motor's output power; and a motor housing including a cylindrical portion that axially covers the motor from a side opposite the centrifugal fan. The motor housing includes, outside an outer surface of the cylindrical portion, a flange rib extending radially outward from the axis.

Description

Technical area

[0001] The present disclosure relates to a blower. This application claims priority based on Japanese Patent Application No. 2022-071627, filed in Japan on April 25, 2022, the contents of which are incorporated herein. State of the art

[0002] Patent Document 1 discloses an intake unit including a suction port, an exhaust port, and a built-in fan that sucks air from the suction port and blows the air toward the exhaust port. Citation listPatent literature

[0003] Patent document 1: JP 02-135700 UM-B Brief description of the inventionTechnical problem

[0004] However, the intake unit described in Patent Document 1 has a problem that water that has penetrated from the outside through the suction port enters the interior of a motor.

[0005] The present disclosure has been made to solve the above-described problem, and an object of the present disclosure is to provide a blower that can suppress the intrusion of water into the interior of the engine. Solution to the problem

[0006] To solve the above-described problem, a blower according to the present disclosure includes: a motor including a motor shaft; a centrifugal fan connected to the motor shaft and rotated about an axis of the motor shaft by the output of the motor; and a motor housing including a cylindrical part that covers the motor from a side opposite to the centrifugal fan in an axial direction. The motor housing includes a flange rib outside an outer surface of the cylindrical part, which extends outward in the radial direction of the axis. Advantageous effects of the invention

[0007] The blower of the present disclosure can prevent water from entering the interior of the engine. Brief description of the drawings Fig. 1 is a side view of an air conditioner according to an embodiment of the present invention. Fig. 2 is a plan view of an air conditioner according to the embodiment of the present invention. Fig. 3 is a side view of a blower according to the embodiment of the present invention. Fig. 4 is an exploded perspective view of the blower according to the embodiment of the present invention. Fig. 5 is a plan view of the blower according to the embodiment of the present invention. Fig. 6 is an enlarged perspective view of a chamfered part according to the embodiment of the present invention. Fig. 7 is a side view of a blower according to a first modification example of the present invention. Fig. 8 is a side view of a blower according to a second modification example of the present invention. Fig. 9 is a side view of a blower according to a third modification example of the present invention. Fig. 10 is a side view of a blower according to a fourth modification example of the present invention. Fig. 11 is a side view of a blower according to a fifth modification example of the present invention. Description of embodimentsAir conditioning

[0008] Hereinafter, an air conditioning system 1 is provided with a blower 10 according to an embodiment of the present disclosure with reference to Fig. 1 to 6.

[0009] The Fig. 1 and Fig. The air conditioning system 1 illustrated in Figure 2 is mounted on a vehicle, for example.

[0010] The air conditioning system 1 includes a heat exchanger 2 and the fan 10. heat exchanger

[0011] The heat exchanger 2 includes a heat exchanger main body 3 and a heat exchanger housing 4.

[0012] The heat exchanger main body 3 exchanges heat with the air supplied from the fan 10 to generate hot or cold air.

[0013] The heat exchanger main body 3 is integrated into the heat exchanger housing 4. The heat exchanger housing 4 includes a supply port 4a and an outlet port 4b.

[0014] The supply port 4a supplies air from the fan 10 into the interior of the heat exchanger housing 4. The outlet port 4b discharges the hot or cold air generated by the heat exchanger 2 to the outside of the heat exchanger housing 4. fan

[0015] The fan 10 supplies air to the heat exchanger 2. As shown in Fig. 2 to Fig. 5, the blower 10 includes a motor 20, a centrifugal fan 30, a scroll casing 40 and a motor housing 50. In Fig. 2, a detailed configuration inside the spiral casing 40 of the blower 10 is omitted, and only the centrifugal fan 30 is simplified and illustrated as a simple circle. In Fig. 5, the motor 20 and the centrifugal fan 30 are omitted and a lower part of a cylindrical part 51 of the motor housing 50 is illustrated. Motor

[0016] The motor 20 includes a motor main body 21 and a motor shaft 22. The motor main body 21 is formed in a cylindrical shape.

[0017] The motor shaft 22 is coaxial with the motor main body 21. The motor shaft 22 extends in one direction.

[0018] Hereinafter, an axis O of the motor shaft 22 may be simply referred to as "axis O." A direction of the axis O of the motor 20 may be simply referred to as "axis O direction," a radial direction of the axis O may be simply referred to as "radial direction," and a circumferential direction of the axis O may be simply referred to as "circumferential direction." Centrifugal fan

[0019] The centrifugal fan 30, for example, is a sirocco fan. The centrifugal fan 30 is connected to the motor shaft 22 and is rotated about the axis O by the output power of the motor 20.

[0020] The centrifugal fan 30 includes a fan shaft 31, a multi-stage blade part 32 and a connecting part 33.

[0021] The fan shaft 31 extends in the direction of the axis O and is connected to the motor shaft 22.

[0022] The multi-stage blade part 32 is provided radially outside the fan shaft 31.

[0023] The multi-stage blade part 32 includes a blade part 34 and an annular part 35.

[0024] A plurality of blade portions 34 are provided at equal intervals in the circumferential direction. The blade portion 34 is rod-shaped and extends in the direction of the axis O. Both end portions of the blade portion 34 in the direction of the axis O are respectively located on both outer sides of the fan shaft 31 in the direction of the axis O.

[0025] A pair of annular parts 35 are provided on both sides of the plurality of blade parts 34 in the direction of the axis O. The annular part 35 is annular and extends in the circumferential direction. The annular parts 35 connect end portions of the plurality of blade parts 34.

[0026] The connecting part 33 is provided between the fan shaft 31 and the multi-stage blade part 32. The connecting part 33 connects the fan shaft 31 and the multi-stage blade part 32 in the radial direction. A plurality of connecting parts 33 are provided for the respective blade parts 34. The plurality of blade parts 34 are arranged at equal intervals in the circumferential direction. The connecting part 33 is arc-shaped and, in a side view, approaches the fan shaft 31 radially inward from the blade part 34. Spiral casing

[0027] The centrifugal fan 30 is installed in the scroll casing 40. The scroll casing 40 includes a first chamber 41, a second chamber 42, and a nose portion 43. First Chamber

[0028] The centrifugal fan 30 is installed in the first chamber 41. The first chamber 41 includes a suction port 44 and a fitting port 45.

[0029] The suction connection 44 opens on a side opposite the motor 20 beyond the centrifugal fan 30 in the direction of the axis O.

[0030] The fitting connection 45 opens on a side opposite the suction connection 44 via the centrifugal fan 30 in the direction of the axis O. Second Chamber

[0031] The second chamber 42 communicates with the first chamber 41. The second chamber 42 includes an outlet port 46.

[0032] The outlet port 46 opens on a side opposite the first chamber 41 in a direction intersecting the direction of the axis O. The outlet port 46 is connected to the supply port 4a of the heat exchanger 2.

[0033] The first chamber 41 and the second chamber 42 form a flow path for an air flow generated by the centrifugal fan 30 from the suction port 44 to the outlet port 46. Nose part

[0034] The nose piece 43 is provided at a connecting portion between the first chamber 41 and the second chamber 42. The nose piece 43 protrudes into the flow path in the scroll casing 40. The nose piece 43 rectifies the airflow generated by the centrifugal fan 30 from the suction port 44 and directs the airflow to the exhaust port 46. Engine housing

[0035] The motor housing 50 is provided on a side opposite the centrifugal fan 30 above the motor 20 in the direction of the axis O. The motor housing 50 is a member that houses the motor 20. The motor housing 50 is made of a resin material. The motor housing 50 includes a cylindrical part 51, a flange 52, an outer peripheral rib 53, and a flange rib 54. Cylindrical part

[0036] The cylindrical part 51 is a bottomed cylindrical member extending in the direction of the axis O. The cylindrical part 51 covers the motor 20 from a side opposite to the centrifugal fan 30 in the direction of the axis O. In the present embodiment, the cylindrical part 51 is formed in a cylindrical shape. flange

[0037] The flange 52 is provided over the entire circumference of an outer surface 51a of the cylindrical part 51. The flange 52 extends radially outward from the outer surface 51a of the cylindrical part 51. The flange 52 is inserted into the fitting port 45 of the volute casing 40. The fitting port 45 is closed by the flange 52. Outer circumferential rib

[0038] The outer circumferential rib 53 is provided outside the outer surface 51a of the cylindrical part 51. The outer circumferential rib 53 is separated from the cylindrical part 51 in the radial direction. The outer circumferential rib 53 is annular when viewed from the direction of the axis O. The outer circumferential rib 53 extends in the direction of the axis O. The height of the outer circumferential rib 53 is less than the height of the cylindrical part 51. Flange rib

[0039] The flange rib 54 is provided outside the outer surface 51a of the cylindrical part 51. In the present embodiment, the flange rib 54 is provided on the outermost side of the outer peripheral rib 53 in the radial direction. The flange rib 54 extends outward in the radial direction of the axis O and in a direction perpendicular to the axis O. The flange rib 54 is annular when viewed from the direction of the axis O and is provided at a position corresponding to the nose part 43. That is, the flange rib 54 is provided at a location close to the nose part 43. slot

[0040] A slit 55 is formed in the outer peripheral rib 53 and the flange rib 54. A pair of slits 55 are provided at positions 180 degrees apart from each other around the axis O. The slit 55 penetrates the outer peripheral rib 53 in the radial direction and penetrates the flange rib 54 in the direction of the axis O. Slope

[0041] As in Fig. As illustrated in Figure 6, a slope 56 is provided between the cylindrical portion 51 and the outer peripheral rib 53. The slope 56 is formed to extend in the circumferential direction. The slope 56 is formed to approach the flange 52 as it approaches the slot 55. Operational impact

[0042] The following describes an operation of the blower 10 with reference to Fig. 2 and Fig. 3 described.

[0043] The centrifugal fan 30 is rotated around the axis O by the output of the motor 20, drawing outside air into the centrifugal fan 30 through the intake port 44. The air drawn into the centrifugal fan 30 is discharged to the outside in the radial direction of the centrifugal fan 30. This creates an airflow in the first chamber 41 of the scroll casing 40. The airflow is directed by the nose piece 43 so that it flows from the first chamber 41 to the second chamber 42.

[0044] However, an air flow towards the center of the motor 20 is generated at the nose part 43 due to a backflow. When water W penetrates into the interior of the scroll casing 40 through the suction port 44, the penetrated water W attempts to penetrate into the interior of the motor 20 by the flow towards the center of the motor 20.

[0045] On the other hand, in the fan 10 of the present embodiment, the flange rib 54 and the outer peripheral rib 53 are installed, thereby preventing water W from entering the interior of the motor 20. The operation and effects of each component of the fan 10 will be described in detail below.

[0046] In the present embodiment, the motor housing 50 includes the cylindrical part 51 covering the motor 20 from a side opposite to the centrifugal fan 30 in the direction of the axis O, and the flange rib 54 extending outwardly in the radial direction of the axis O on the outside of the outer surface 51a of the cylindrical part 51.

[0047] According to the present embodiment, the fan 10 can block the water W from entering the interior of the motor 20 with the cylindrical part 51. Furthermore, the fan 10 can more reliably block the water W that attempts to overflow the cylindrical part 51 and enter the interior of the motor 20 with the flange rib 54. In this way, the fan 10, with the cylindrical part 51 and the flange rib 54, can prevent water W from entering the interior of the motor 20.

[0048] In the present embodiment, the flange rib 54 extends in a direction perpendicular to the axis O.

[0049] According to the present embodiment, the flange rib 54 more easily blocks water W attempting to enter the interior of the motor 20 than in a case where the flange rib 54 extends toward the centrifugal fan 30. Accordingly, the blower 10 can more reliably prevent water W from entering the interior of the motor 20. The flange rib 54 can be formed more easily compared to a case where the flange rib 54 extends toward the centrifugal fan 30. For example, the flange rib 54 can be formed with a molding mechanism such as a sliding core to minimize the cost increase of the blower 10.

[0050] In the present embodiment, the flange rib 54 is annular when viewed from the direction of the axis O.

[0051] According to the present embodiment, the flange rib 54 can block the water W attempting to penetrate into the interior of the motor 20 over the entire circumference of the cylindrical part 51. Accordingly, the fan 10 can more reliably prevent the penetration of water W into the interior of the motor 20.

[0052] In the present embodiment, the motor housing 50 further includes the outer circumferential rib 53 which is annular when viewed from the direction of the axis O and extends in the direction of the axis O on the outside of the outer surface 51a of the cylindrical part 51.

[0053] According to the present embodiment, the fan 10 can block the water W attempting to overflow the cylindrical portion 51 and penetrate the interior of the motor 20 with the outer peripheral rib 53. Accordingly, the fan 10 can more reliably prevent the water W from entering the interior of the motor 20.

[0054] In the present embodiment, the flange rib 54 is provided on the outer peripheral rib 53 on the outermost side in the radial direction.

[0055] According to the present embodiment, the fan 10 with the flange rib 54 at a position radially outwardly separated from the cylindrical part 51 can block a flow attempting to penetrate the interior of the motor 20. Accordingly, the fan 10 can more reliably prevent water W from entering the interior of the motor 20. The flange rib 54 can be formed simply. For example, the flange rib 54 can be formed with a molding mechanism such as a sliding core to minimize the cost increase of the fan 10.

[0056] In the present embodiment, the outer peripheral rib 53 includes the slits 55 penetrating the outer peripheral rib 53 in the radial direction.

[0057] According to the present embodiment, the fan 10 can discharge the water W accumulated between the cylindrical part 51 and the outer peripheral rib 53 through the slits 55 to the outside of the outer peripheral rib 53. Thus, the fan 10 can prevent the water W accumulated between the cylindrical part 51 and the outer peripheral rib 53 from overflowing the cylindrical part 51 and entering the interior of the motor 20.

[0058] In the present embodiment, the blower 10 includes the scroll casing 40, which includes the suction port 44, the discharge port 46, and the built-in centrifugal fan 30.

[0059] According to the present embodiment, an air flow in the blower 10 can be adjusted in any direction depending on the arrangement of the suction port 44 and the exhaust port 46. Even if the water W attempts to penetrate into the interior of the motor 20 with the air flow generated in the scroll casing 40, the flange rib 54 can further block the water W. In this way, the blower 10 with the flange rib 54 can prevent the water W from entering the interior of the motor 20, while adjusting the air flow in any direction with the scroll casing 40.

[0060] In the present embodiment, the flange rib 54 is provided at a position corresponding to the nose part 43 of the scroll casing 40.

[0061] At the nose portion 43, the airflow generated by the centrifugal fan 30 is reversed to generate an airflow toward the center of the motor 20. According to the present embodiment, the flange rib 54 can block the water W that attempts to enter the interior of the motor 20 due to the airflow toward the center of the motor 20. Accordingly, the blower 10 can more reliably prevent the water W from entering the interior of the motor 20. First modification example

[0062] Hereinafter, the blower 10 according to a first modification example of the present disclosure will be described with reference to Fig. 7. As described in Fig. 7, in the present modification, the flange rib 54 is provided so as to be inclined with respect to the cylindrical member 51 and the outer peripheral rib 53. More specifically, the flange rib 54 is provided on the outer peripheral rib 53 and is inclined while gradually separating from the centrifugal fan 30 in the radially outward direction.

[0063] The flange rib 54 is preferably a separate part from the cylindrical part 51 and the outer peripheral rib 53. In this case, an annular rib inclined with respect to the cylindrical part 51 and the outer peripheral rib 53 can be formed relatively easily.

[0064] Note that the flange rib 54 may be inclined to gradually approach the centrifugal fan 30 outward in the radial direction. The flange rib 54 may be provided on the cylindrical part 51. Second modification example

[0065] Hereinafter, the blower 10 according to a second modification example of the present disclosure will be described with reference to Fig. 8. As described in Fig. 8, in the present modification, the outer circumferential rib 53 is not provided outside the outer surface 51a of the cylindrical part 51, and the flange rib 54 is provided on the outer surface 51a of the cylindrical part 51. Third modification example

[0066] Hereinafter, the blower 10 according to a third modification example of the present disclosure will be described with reference to Fig. 9. As described in Fig. As illustrated in Fig. 9, a plurality of flange ribs 54 are provided in the present modification. More specifically, the flange rib 54 is provided on both the cylindrical portion 51 and the outer peripheral rib 53.

[0067] According to the present modification example, the fan 10 with the flange ribs 54 can better block the water W attempting to enter the interior of the motor 20 than in a case where only one flange rib 54 is provided. Accordingly, the fan 10 can more reliably prevent the water W from entering the interior of the motor 20.

[0068] The number of flange ribs 54 can be changed as appropriate depending on the design of the blower 10. Fourth modification example

[0069] Hereinafter, the blower 10 according to a fourth embodiment of the present disclosure will be described with reference to Fig. 10. As described in Fig. As illustrated in Figure 10, in the present modification, a plurality of flange ribs 54 are provided. Specifically, two flange ribs 54 are provided on the outer peripheral rib 53. The two flange ribs 54 are provided so as to be spaced apart from each other in the direction of the axis O.

[0070] The blower 10 according to the present modification example can achieve the same operational effects as the blower 10 according to the third modification example.

[0071] The number of flange ribs 54 can be changed as appropriate depending on the design of the blower 10. Fifth modification example

[0072] Hereinafter, the blower 10 according to a fifth modification example of the present disclosure will be described with reference to Fig. 11. As described in Fig.As illustrated in FIG. 11, in the present modification, a plurality of layers of outer circumferential ribs 53 are provided adjacent to each other in the radial direction. More specifically, two outer circumferential ribs 53 are provided adjacent to each other in the radial direction.

[0073] The flange rib 54 is provided on the outer peripheral rib 53 on the outermost side in the radial direction from the plurality of layers of the outer peripheral ribs 53.

[0074] In the present modification example, the plurality of layers of outer circumferential ribs 53 are provided adjacent to each other in the radial direction. Thus, the fan 10 with the plurality of layers of outer circumferential ribs 53 can better block water W attempting to enter the interior of the motor 20 than in a case where only one outer circumferential rib 53 is provided. Accordingly, the fan 10 can more reliably prevent water W from entering the interior of the motor 20.

[0075] The number of layers of the outer circumferential ribs 53 can be changed as desired depending on the design of the fan 10. Other embodiment

[0076] The embodiments according to the present disclosure have been described in detail with reference to the drawings. However, a specific configuration of the present disclosure is not limited to these embodiments and also includes a design change or the like without departing from the gist of the present disclosure. In the embodiments described above, the flange rib 54 is annular when viewed from the direction of the axis O, but the shape is not limited to this. The flange rib 54 may be provided only at a position corresponding to a part of the outer surface 51a of the cylindrical part 51. That is, the flange rib 54 may be provided only at a position corresponding to the nose part 43.

[0077] In the embodiments described above, the blower 10 includes the scroll casing 40, but the configuration is not limited thereto. The blower 10 does not necessarily need to include the scroll casing 40. Even if the scroll casing 40 is not present, air may flow back toward the center of the motor 20 along the flange 52 of the motor housing 50, for example, when there is an obstacle near the centrifugal fan 30 that blocks the airflow generated by the centrifugal fan 30, or when a strong airflow is generated near the centrifugal fan 30 due to an external factor. Even if the water W tries to penetrate into the interior of the motor 20 due to such air backflow, the blower 10 can block the water W with the flange rib 54. Additional information

[0078] The blower 10 according to each embodiment can be understood, for example, as follows.

[0079] (1) A blower 10 according to a first aspect includes: a motor 20 including a motor shaft 22; a centrifugal fan 30 connected to the motor shaft 22 and rotated about an axis O of the motor shaft 22 by the output of the motor 20; and a motor housing 50 including a cylindrical part 51 covering the motor 20 from a side opposite to the centrifugal fan 30 in the direction of the axis O. The motor housing 50 includes a flange rib 54 extending outward in the radial direction of the axis O on an outer side of an outer surface 51a of the cylindrical part 51.

[0080] According to the present aspect, the fan 10 with the flange rib 54 can block water W that tries to go beyond the cylindrical part 51 and penetrate into the interior of the motor 20.

[0081] (2) A blower 10 according to a second aspect is the blower 10 of (1), wherein the flange rib 54 may extend in a direction perpendicular to the direction of the axis O.

[0082] According to the present aspect, the flange rib 54 more easily blocks the water W attempting to enter the interior of the motor 20 than in a case where the flange rib 54 extends toward the centrifugal fan 30. The flange rib 54 can be formed more easily compared to a case where the flange rib 54 extends toward the centrifugal fan 30.

[0083] (3) A blower 10 according to a third aspect is the blower 10 of (1) or (2), wherein the flange rib 54 may be annular as viewed from the direction of the axis O.

[0084] According to the present aspect, the flange rib 54 can block the water W attempting to penetrate into the interior of the engine 20 over the entire circumference of the cylindrical part 51.

[0085] (4) A blower 10 according to a fourth aspect is the blower 10 according to any one of (1) to (3), wherein the motor housing 50 further includes, outside the outer surface 51a of the cylindrical part 51, an outer circumferential rib 53 which is annular when viewed from the direction of the axis O and extends in the direction of the axis O.

[0086] According to the present aspect, the fan 10 having the outer peripheral rib 53 can block the water W attempting to go beyond the cylindrical part 51 and enter the interior of the motor 20.

[0087] (5) A blower 10 according to a fifth aspect is the blower 10 of (4), wherein the flange rib 54 may be provided on the outer peripheral rib 53 on an outermost side in the radial direction.

[0088] According to the present aspect, the fan 10 can block a current attempting to enter the interior of the motor 20, with the flange rib 54 located at a position radially separated from the cylindrical part 51. The flange rib 54 can be formed simply.

[0089] (6) A fan 10 according to a sixth aspect is the fan 10 of (4) or (5), wherein the outer peripheral rib 53 includes a slit 55 penetrating the outer peripheral rib 53 in the radial direction.

[0090] According to the present aspect, the blower 10 can discharge the water W accumulated between the cylindrical part 51 and the outer peripheral rib 53 through the slit 55 to the outside of the outer peripheral rib 53.

[0091] (7) A blower 10 according to a seventh aspect is the blower 10 according to any one of (1) to (6), wherein a plurality of the flange ribs 54 may be provided.

[0092] According to the present aspect, the fan 10 having the flange fins 54 can better block the water W attempting to enter the interior of the motor 20 than in a case where only one flange fin 54 is provided.

[0093] (8) A blower 10 according to an eighth aspect is the blower 10 according to any one of (1) to (7), which further includes a scroll casing 40 including a built-in centrifugal fan 30, a suction port 44 opening on a side opposite to the motor 20 across the centrifugal fan 30 in the direction of the axis O, and an exhaust port 46 opening in a direction intersecting the direction of the axis O.

[0094] According to the present aspect, an air flow in the blower 10 can be adjusted in any direction depending on the arrangement of the suction port 44 and the exhaust port 46. Furthermore, even if the water W tries to penetrate into the interior of the motor 20 with the air flow generated in the scroll casing 40, the flange rib 54 may block the water W.

[0095] (9) A blower 10 according to a ninth aspect is the blower 10 of (8), wherein the flange rib 54 may be provided at a position corresponding to a nose part 43 of the scroll casing 40.

[0096] At the nose portion 43, the airflow generated by the centrifugal fan 30 is reversed to generate an airflow toward the center of the motor 20. According to the present aspect, the flange rib 54 can block the water W attempting to enter the interior of the motor 20 due to the airflow toward the center of the motor 20. Industrial applicability

[0097] The blower of the present disclosure can prevent water from entering the interior of the engine. List of reference symbols

[0098] 1 Air conditioner, 2 Heat exchanger, 3 Heat exchanger main body, 4 Heat exchanger casing, 4a Supply port, 4b Outlet port, 10 Blower, 20 Motor, 21 Motor main body, 22 Motor shaft, 30 Centrifugal fan, 31 Fan shaft, 32 Multi-stage blade part, 33 Connecting part, 34 Blade part, 35 Annular part, 40 Volute casing, 41 First chamber, 42 Second chamber, 43 Nose part, 44 Suction port, 45 Fitting port, 46 Outlet port, 50 Motor casing, 51 Cylindrical part, 51a Outer surface, 52 Flange, 53 Outer circumferential rib, 54 Flange rib, 55 Slot, 56 Incline, O axis, W Water 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 2022-071627

[0001] JP 02-135700

[0003]

Claims

[1] Blower, comprising: a motor including a motor shaft; a centrifugal fan connected to the motor shaft and rotated about an axis of the motor shaft by the output of the motor; and a motor housing including a cylindrical part covering the motor from a side opposite the centrifugal fan in a direction of the axis, wherein the motor housing includes, outside an outer surface of the cylindrical part, a flange rib which extends outwards in the radial direction of the axis. [2] The blower according to claim 1, wherein the flange rib extends in a direction perpendicular to the direction of the axis. [3] A blower according to claim 1 or 2, wherein the flange rib is annular when viewed from the direction of the axis. [4] A blower according to claim 1 or 2, wherein the motor housing further includes, outside the outer surface of the cylindrical part, an outer circumferential rib which is annular when viewed from the direction of the axis and extends in the direction of the axis. [5] The blower according to claim 4, wherein the flange rib is provided on the outer peripheral rib on an outermost side in the radial direction. [6] The blower according to claim 4, wherein the outer peripheral rib includes a slit penetrating the outer peripheral rib in the radial direction. [7] A blower according to claim 1 or 2, wherein a plurality of said flange ribs are provided. [8] A blower according to claim 1 or 2, further comprising a scroll casing including a built-in centrifugal fan, a suction port opening on a side opposite to the motor across the centrifugal fan in the direction of the axis, and an exhaust port opening in a direction crossing the direction of the axis. [9] A blower according to claim 8, wherein the flange rib is provided at a position corresponding to a nose part of the scroll casing.

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