Fan unit and dryer

Abstract

The present invention provides a fan unit that is firmly held in the housing while suppressing the transmission of vibrations. [Solution] The fan unit comprises a motor disposed inside a cylindrical fan case and a vibration-damping member 40 disposed on the outer circumferential surface of the fan case. The vibration-damping member comprises a fan unit holding portion that holds the outer circumferential surface of the fan case, a first cylindrical portion connected to one axial side of the fan unit holding portion, and a second cylindrical portion connected to the other axial side of the fan unit holding portion. The fan unit holding portion has a holding portion contact surface at the end on the other axial side that contacts a part of the inner circumferential recess in the axial direction in a plane perpendicular to the axial direction. The first cylindrical portion has a first contact portion that contacts a part of the inner circumferential recess at least in the axial direction. The second cylindrical portion has a second contact portion that contacts a part of the inner circumferential recess in the axial and radial directions. The first cylindrical portion has a thin-walled portion 422 formed thereon, which is thinner in the radial direction than adjacent portions in the axial direction.

Description

Technical Field

[0001] The present invention relates to a fan unit and a dryer using the fan unit.

Background Art

[0002] Conventionally, a configuration is known in which a vibration damping member is attached to the outer peripheral surface of the exterior of a motor, and the motor is attached to a housing via the vibration damping member (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When attaching a motor to a housing, there is a case where the vibration damping member is deformed and the portion in contact with the housing becomes large, and the vibration of the motor is transmitted to the housing.

[0005] An object of the present invention is to provide a fan unit that is firmly held by a housing and suppresses transmission of vibration.

Means for Solving the Problems

[0006] An exemplary fan unit of the present invention is disposed inside a cylindrical housing that extends in the axial direction. The fan unit includes a fan case having an airflow channel through which air flows, a motor disposed inside the fan case, rotor blades rotated by the motor, and a vibration-damping member disposed in an inner circumferential recess formed on the inner circumferential surface of the housing and disposed on the outer circumferential surface of the fan case. The vibration-damping member includes a cylindrical fan unit holding portion that holds at least the outer circumferential surface of the fan case, a cylindrical first cylindrical portion connected to one axial end of the fan unit holding portion, and a cylindrical second cylindrical portion connected to the other axial end of the fan unit holding portion. The fan unit holding portion has a holding portion contact surface formed at the other axial end that extends in a direction perpendicular to the axial direction and contacts a part of the inner circumferential recess in the axial direction. The first cylindrical portion has a first contact portion that contacts a part of the inner circumferential recess at least in the axial direction. The second cylindrical portion has a second contact portion that contacts a part of the inner circumferential recess in the axial and radial directions. The first cylindrical portion has a thin-walled portion and a thick-walled portion located on at least one of the axial sides of the thin-walled portion and the other axial side, and having a greater radial thickness than the thin-walled portion. [Effects of the Invention]

[0007] According to an exemplary fan unit of the present invention, vibration transmission can be suppressed while being firmly held in the housing. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic cross-sectional view of a hair dryer, which is an example of a fan unit used in an embodiment of the present invention. [Figure 2] Figure 2 is a schematic cross-sectional view of the fan unit. [Figure 3] Figure 3 is a schematic cross-sectional view of a fan unit having vibration-damping members. [Figure 4] Figure 4 is a schematic cross-sectional view of a fan unit having a vibration-damping member according to the first modified example. [Figure 5] Figure 5 is a schematic cross-sectional view of a fan unit having a vibration-damping member according to a second modified example. [Figure 6] Figure 6 is a schematic cross-sectional view of a fan unit having a vibration-damping member according to a third modified example. [Figure 7] Figure 7 is a schematic cross-sectional view of a fan unit having a vibration-damping member according to the fourth modified example. [Figure 8] Figure 8 is a schematic cross-sectional view of a fan unit having a vibration-damping member according to the fifth modified example. [Figure 9] Figure 9 is a schematic cross-sectional view of a fan unit having a vibration-damping member according to the sixth modified example. [Figure 10] Figure 10 is a schematic cross-sectional view of a fan unit having a vibration-damping member according to the seventh modified example. [Figure 11] Figure 11 is a schematic cross-sectional view of a fan unit having a vibration-damping member according to the eighth modified example. [Figure 12] Figure 12 is a schematic cross-sectional view of a fan unit having a vibration-damping member according to the ninth modified example. [Figure 13] Figure 13 is a schematic diagram of the vibration-damping member of the 10th modified example, viewed from the axial direction. [Figure 14] Figure 14 is an unfolded view of the vibration-damping member of the 11th modified example, shown unfolded in the circumferential direction. [Modes for carrying out the invention]

[0009] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the direction parallel to the central axis J of the fan unit 20 is referred to as the "axial direction," the direction perpendicular to the central axis J of the fan unit 20 is referred to as the "radial direction," and the direction along the arc centered on the central axis J of the fan unit 20 is referred to as the "circumferential direction." In this specification, in the fan unit 20 shown in Figure 2, the axial direction is indicated as the left-right direction. In Figure 2, the left side in the axial direction is referred to as the upstream DU side in the airflow direction, and is referred to as one DU side in the axial direction. The right side in the axial direction is referred to as the downstream DD side in the airflow direction, and is referred to as the other DD side in the axial direction. The above directions are merely names used for explanatory purposes and do not limit the actual positional relationships and directions.

[0010] <Configuration of Hair Dryer 100> The hair dryer 100 of an exemplary embodiment of the present invention will be described. FIG. 1 is a schematic cross-sectional view of a hair dryer which is an example of the adoption of a fan unit according to an embodiment of the present invention.

[0011] The hair dryer 100 has a housing 10 and a fan unit 20. A duct 11 is formed inside the housing 10. The fan unit 20 is disposed inside the cylindrical housing 10 extending in the axial direction. That is, the fan unit 20 is attached to the housing 10. The fan unit 20 generates an air flow Af. The air flow Af flows inside the duct 11. An air outlet 11a opens at the downstream end in the flow direction of the air flow Af in the duct 11, and an air inlet 11b opens at the upstream end. Further, a heater (not shown) is disposed inside the duct 11. The heater heats the air flow.

[0012] [[ID=1�]]The housing 10 has a cylindrical portion 12 and a handle portion 13. The cylindrical portion 12 has a main body portion 121 and a lid portion 122. The main body portion 121 is cylindrical and has an internal space 1210.

[0013] The main body portion 121 of the cylindrical portion 12 has an inner circumferential recess 14. The inner circumferential recess 14 is disposed at one end DU side in the axial direction of the main body portion 121. The inner circumferential recess 14 is annular, recessed radially outward and continuous in the circumferential direction. The inner circumferential recess 14 has a first recess 141, a second recess 142, a first contact surface 143, and a second contact surface 144.

[0014] The first recess 141 is a cylindrical recess recessed axially from one end DU side in the axial direction of the main body portion 121. The first recess 141 has a larger inner diameter than other parts of the internal space 1210 of the main body portion 121. And the first contact surface 143 is provided at the axially inner end of the first recess 141. The first contact surface 143 is an annular plane extending in a direction orthogonal to the central axis J.

[0015] Further, the second recess 142 is an annular recess that is recessed axially rearward from the first contact surface 143. The inner diameter of the second recess 142 is larger than the inner diameter of the inner peripheral surface of the inner peripheral recess 14 of the main body portion 121 and smaller than the inner diameter of the first recess 141. And the second contact surface 144 is provided at the end on the other axial side DD of the second recess 142. The second contact surface 144 is an annular flat surface that extends in a direction orthogonal to the central axis J.

[0016] The lid portion 122 is also cylindrical like the main body portion 121 and has an internal space 1220. And the lid portion 122 is detachably arranged on one axial side DU of the main body portion 121. By attaching the lid portion 122 to the main body portion 121, the internal space 1210 and the internal space 1220 are connected. When the internal space 1210 and the internal space 1220 are connected, the duct 11 is formed.

[0017] In the cylindrical portion 12 of the present embodiment, a male screw portion 123 is formed on the outer peripheral surface of the main body portion 121. Also, a female screw portion 124 is formed on the inner peripheral surface of the lid portion 122. By screwing the female screw portion 124 into the male screw portion 123, the lid portion 122 is detachably arranged on the main body portion 121. Note that the method of fixing the lid portion 122 to the main body portion 121 is not limited to the above method. For example, fixing by an elastically deformable hook, screwing using a separately provided screw, etc. may be adopted. Further explained, the fixing method can widely adopt a method that can detachably and firmly fix the lid portion 122 to the main body portion 121.

[0018] The lid portion 122 has a lid inner peripheral recess 15. The lid inner peripheral recess 15 is an annular recess that is recessed axially on one side DU from the side facing the main body portion 121. The lid inner peripheral recess 15 has a tapered recess 151 and an end face portion 152. The tapered recess 151 is provided at the end on one axial side DU of the lid inner peripheral recess 15. The tapered recess 151 has an inclination such that the inner diameter narrows toward the one axial side DU. Also, the end face portion 152 is provided at the end on one axial side DU of the lid inner peripheral recess 15. The end face portion 152 is an annular flat surface orthogonal to the central axis J.

[0019] A fan unit 20 is placed inside the duct 11. With the fan unit 20 positioned in the internal space 1210 of the main body 121, the cover 122 is attached. When the cover 122 is attached to the main body 2121, it pushes the fan unit 20 axially toward the other DD side. This positions and secures the fan unit 20 to the main body 121.

[0020] An intake port 11b is opened at one end of the cylindrical portion 12 on the axial side DU. When the fan unit 20 is driven, air is drawn in through the intake port 11b. This generates an airflow Af inside the duct 11 of the housing 10, directed towards the other axial side DD.

[0021] <Handle section 13> The handle portion 13 is a grippable cylindrical shape and is attached to the cylindrical portion 12. Inside the handle portion 13, for example, a circuit board (not shown) on which the control circuit of the hair dryer 100 is configured, a battery (not shown) which is the power source, and the like are arranged.

[0022] In this embodiment, the hair dryer 100 has a configuration in which the fan unit 20 is arranged in the internal space 1210 of the main body portion 121 of the cylindrical portion 12, but it is not limited to this. For example, the fan unit 20 may be arranged in the internal space of the handle portion 13, and the airflow generated in the handle portion 13 may flow into the cylindrical portion 12.

[0023] In this configuration, the airflow generated in the handle section 13 flows into the internal space 1210 of the main body section 121 of the cylindrical section 12. An air guide section (not shown) is provided in the internal space 1210 of the main body section 121. The airflow that flows into the internal space 1210 flows toward the outlet 11a by the air guide section (not shown). Air may also be drawn in from the opening at one end of the cylindrical section 12 on the axial side DU due to pressure fluctuations in the airflow Af. This increases the airflow rate.

[0024] <Configuration of Fan Unit 20> Figure 2 is a longitudinal cross-sectional view of the fan unit 20 attached to the cylindrical portion 12. The fan unit 20 includes a fan case 21, rotor blades 22, a motor 30, and a vibration damping member 40.

[0025] <Fan Case 21> The fan case 21 is made of, for example, metal and houses the rotor blades 22 and motor 30 radially inward. The fan case 21 has an inner cylinder portion 211, an outer cylinder portion 212, an airflow passage 213, and stator blades 214. The inner cylinder portion 211 is formed in a cylindrical shape and covers the motor 30 from the radial outside. The inner cylinder portion 211 also has a structure that allows it to be divided axially. With this configuration, the motor 30 can be housed inside the inner cylinder portion 211.

[0026] The outer cylinder portion 212 is formed in a cylindrical shape, with an inner diameter larger than the outer diameter of the inner cylinder portion 211. The outer cylinder portion 212 is positioned radially outside the inner cylinder portion 211 with a gap in between. The airflow passage 213 is positioned radially between the inner cylinder portion 211 and the outer cylinder portion 212. An intake port 212a opens at the axial lower end of the outer cylinder portion 212. An exhaust port 212b opens at the axial upper end of the outer cylinder portion 212. In the hair dryer 100, the fan unit 20 is positioned with the intake port 212a facing the suction port 11b.

[0027] As the rotor blades 22 rotate, the outside air drawn in through the intake port 11b is taken in as airflow Af through the intake port 212a and flows through the airflow channel 213. In other words, the cylindrical fan case 21 has an airflow channel 213 through which airflow Af flows. Airflow Af flowing through the airflow channel 213 comes into contact with the inner cylinder portion 211. The outside air of the hair dryer 100 is at a lower temperature than the inside air. Therefore, the motor 30 positioned there is efficiently cooled.

[0028] The stator vanes 214 extend radially from the inner cylinder portion 211 to the outer cylinder portion 212 within the airflow passage 213. The stator vanes 214 connect the inner cylinder portion 211 and the outer cylinder portion 212. The stator vanes 214 rectify the airflow Af within the airflow passage 213. This improves the airflow efficiency of the fan unit 20.

[0029] <Rotating blade 22> The rotor blade 22 is formed of, for example, resin. The rotor blade 22 is located radially inside the outer cylinder portion 212 and below the axial direction of the motor 30. The rotor blade 22 is rotated around the central axis J by the motor 30. The material forming the rotor blade 22 is not limited to resin, but may be a metallic material such as aluminum or an aluminum alloy. Since the rotor blade 22 rotates, it is preferable that it be made of a lightweight and highly rigid material.

[0030] <Motor 30> The motor 30 is housed inside the inner cylinder 211. That is, the motor 30 is positioned inside the fan case 21. The motor 30 may be fixed inside the fan case 21. The motor 30 rotates the rotor blades 22 around the central axis J. The motor 30 includes a shaft 31, a rotor 32, a stator 33, a pair of bearings 341 and 342, and a circuit board 35.

[0031] <Stata 33> The stator 33 is fixed to the inner circumferential surface of the inner cylinder portion 211. The stator 33 includes a stator core 331, an insulator 332, and a coil 333. The stator core 331 is constructed by laminating electromagnetic steel sheets, such as silicon steel sheets, vertically. The insulator 332 is made of an insulating material, such as resin. The insulator 332 covers the outer surface of at least the radially extending teeth of the stator core 331. The coil 333 consists of a wire wound around the teeth of the stator core 331 via the insulator 332. The insulator 332 electrically insulates the stator core 331 and the coil 333.

[0032] The stator 33 is cylindrical. The rotor 32 is positioned radially inward of the stator 33. The motor 30 is a so-called inner rotor motor. However, it is not limited to this and may also be an outer rotor motor.

[0033] <Rotor 32> The outer circumferential surface of the rotor 32 faces the inner circumferential surface of the stator core 331 radially, with a gap in between. The rotor 32 rotates around the central axis J relative to the stator 33. The rotor 32 has a rotor magnet 321. The rotor magnet 321 is cylindrical. The outer circumferential surface of the rotor magnet 321 has alternating north and south poles arranged in the circumferential direction. Note that the rotor magnet 321 is not limited to a cylindrical shape, and multiple magnets may be arranged in the circumferential direction. In this case, the magnets may be flat or curved. Any configuration in which north and south poles are arranged alternately in the circumferential direction is acceptable.

[0034] <Shaft 31> The shaft 31 extends along the central axis J. The shaft 31 is a columnar member made of metal such as stainless steel, extending vertically in the axial direction. The shaft 31 passes through the center of the rotor 32 in the axial direction. The shaft 31 is fixed to the rotor 32. The shaft 31 rotates together with the rotor 32 around the central axis J. The rotor blades 22 are fixed to the lower part of the shaft 31. As the shaft 31 rotates around the central axis J, the rotor blades 22 rotate around the central axis J.

[0035] <Bearing parts 341, 342> A pair of bearing sections 341 and 342 are attached to the inner cylinder section 211 of the fan case 21. The pair of bearing sections 341 and 342 support the shaft 31 on both sides in the axial direction, with the rotor magnet 321 in between, so that it can rotate around the central axis J relative to the fan case 21. Because the pair of bearing sections 341 and 342 support the shaft 31 at two points separated in the axial direction, even if the centrifugal force due to rotation increases, the tilt between the center of the shaft 31 and the central axis J, known as runout, is suppressed. As a result, vibrations associated with the rotation of the shaft 31 and rotor 32 can be reduced.

[0036] The pair of bearing sections 341 and 342 are composed of, for example, ball bearings, but are not limited thereto. As bearing sections, a wide range of configurations that can rotatably support the shaft 31 can be adopted, such as sleeve bearings.

[0037] The circuit board 35 is positioned on the other axial side DD of the motor 30. The circuit board 35 is, for example, a disc shape that extends radially around a central axis J. The lead wires of the coil 333 are electrically connected to the circuit board 35.

[0038] <Vibration-damping component 40> As shown in Figure 2, the vibration-damping member 40 is positioned between the fan unit 20 and the cylindrical portion 12. That is, the fan unit 20 is attached to the inner circumferential surface of the housing 10 via the vibration-damping member 40. The vibration-damping member 40 covers the outer circumference of the outer cylindrical portion 212 of the fan case 21 of the fan unit 20. That is, the vibration-damping member 40 is positioned in the inner circumferential recess 14 formed on the inner circumferential surface of the housing 10 and on the outer circumferential surface of the fan case 21. The vibration-damping member 40 is made of an elastically deformable material such as rubber or silicone rubber. The vibration-damping member 40 may also be fixed to the outer circumferential surface of the fan case 21.

[0039] Details of the vibration-damping member 40 will be described with reference to the drawings. Figure 3 is a schematic cross-sectional view of the fan unit 20 having the vibration-damping member 40. Figure 3 also shows the main body 121 of the cylindrical part 12, the lid 122, and a part of the fan case 21. As shown in Figures 2 and 3, the vibration-damping member 40 is cylindrical. The vibration-damping member 40 is a support member that supports the fan unit 20 when attaching the fan unit 20 to the main body 121 of the cylindrical part 12. The vibration-damping member 40 has a fan unit holding part 41, a first cylindrical part 42, a second cylindrical part 43, and an internal space 44.

[0040] The internal space 44 of the vibration-damping member 40 is formed to penetrate in the axial direction. An internal groove 442 is formed on the inner circumferential surface 441 of the internal space 44. The internal groove 442 is recessed radially outward from the inner circumferential surface 441. That is, an internal groove 442 recessed radially outward is formed on the inner circumferential surface 441 of the fan unit holding portion 41. The internal groove 442 is continuous in the circumferential direction and is formed in a cylindrical shape. As shown in Figures 2 and 3, the outer cylindrical portion 212 of the fan case 21 of the fan unit 20 fits into the internal groove 442. That is, the fan case 21 is housed in the internal groove 442 with its outer circumferential surface in contact with it.

[0041] <Fan unit holding part 41> The fan unit holder portion 41 is cylindrical. The fan unit holder portion 41 holds at least the outer circumferential surface of the outer cylindrical portion 212 of the fan case 21 of the fan unit 20. In other words, it is preferable that the inner groove 442 is located between the axial ends of the fan unit holder portion 41 in the axial direction. However, a portion of the inner groove 442 may be axially offset from between the axial ends of the fan unit holder portion 41, but the amount of offset should be small.

[0042] The fan unit holder portion 41 has a first end portion 411 and a second end portion 412. The first end portion 411 is the axial end portion of the fan unit holder portion 41 on one side DU. The first end portion 411 has a planar portion 413 that extends in a direction perpendicular to the central axis J. The second end portion 412 is the axial end portion of the fan unit holder portion 41 on the other side DD. The second end portion 412 has a holder portion contact surface 414 that extends in a direction perpendicular to the central axis J. That is, the fan unit holder portion 41 has a holder portion contact surface 414 formed at the axial end portion on the other side DD that extends in a direction perpendicular to the axial direction and contacts a part of the inner circumference recess 14 in the axial direction.

[0043] <First cylinder part 42> The first cylindrical portion 42 is connected to the flat portion 413 of the fan unit holder portion 41. That is, the first cylindrical portion 42 is connected to one axial end DU side of the fan unit holder portion 41. The centerlines of the first cylindrical portion and the first cylindrical portion 42 coincide with the centerline of the fan unit holder portion 41. As shown in Figure 2, when the fan unit 20 is attached to the main body portion 121 of the cylindrical portion 12, the first cylindrical portion 42 is positioned on the side closer to the intake port 11b.

[0044] As shown in Figures 2 and 3, the radial thickness of the first cylindrical portion 42 is thinner than the radial thickness of the fan unit holding portion 41. However, the radial thickness of the first cylindrical portion 42 is not limited to this. The radial thickness of the first cylindrical portion 42 may be the same as or thicker than the radial thickness of the fan unit holding portion 41. In this case, the flat portion 413 of the first end portion 411 is omitted.

[0045] When attaching the fan unit 20 to the internal space 1210 of the main body portion 121 of the cylindrical portion 12, it is preferable that the first cylindrical portion 42 is more easily deformed than the fan unit holding portion 41. Therefore, it is preferable that the radial thickness of the first cylindrical portion 42 is thinner than the radial thickness of the fan unit holding portion 41.

[0046] Furthermore, a first contact portion 420 is provided at one end of the outer circumferential surface of the first cylindrical portion 42 on the axial side DU. That is, the first cylindrical portion 42 has a first contact portion 420 that contacts at least a part of the inner circumferential recess 14 in the axial direction. The first contact portion 420 has a tapered portion 421 whose outer diameter decreases towards the tip. That is, the end of the first contact portion 420 on the axial side DU has a tapered portion 421 whose outer diameter decreases towards the axial side DU.

[0047] Furthermore, the first cylindrical portion 42 has a thin-walled portion 422 in which the radial thickness is thinner than that of other portions, except for the tapered portion 421. That is, the first cylindrical portion 42 has a thin-walled portion 422 in which the radial thickness is thinner than that of adjacent portions in the axial direction. In this embodiment, the thin-walled portion 422 has an outer recess 423 that is recessed radially inward from the outer circumferential surface. That is, the thin-walled portion 422 has an outer recess 423 formed on the outer circumferential surface of the first cylindrical portion 42. The outer recess 423 is formed continuously in the circumferential direction.

[0048] Furthermore, the thin-walled portion 422 has thicker portions 425 on both the axial DU side and the axial DD side, with a greater diameter-rear thickness than the thin-walled portion 422. By having these thicker portions 425, the stress that causes the thin-walled portion 422 to deflect due to compressive stress is concentrated in the thin-walled portion 422. As a result, when compressive stress acts on the vibration-damping member 40, the deformation of the thin-walled portion 422 makes it difficult for the compressive stress to be transmitted to the fan unit holding portion 41. In this embodiment, the thicker portions 425 are located on both the axial DU side and the axial DD side of the thin-walled portion 422, but this is not limited to this configuration. For example, the axial DD side of the thin-walled portion 422 may be directly connected to the fan unit holding portion 41.

[0049] <Second cylinder part 43> The second cylindrical portion 43 is connected to the holding contact surface 414 of the second end 412 of the fan unit holding portion 41. That is, the second cylindrical portion 43 is connected to the other axial end DD of the fan unit holding portion 41. The centerline of the second cylindrical portion 43 coincides with the centerline of the fan unit holding portion 41. In other words, in the vibration-damping member 40, the first cylindrical portion 42 is connected to one axial side DU of the fan unit holding portion 41, and the second cylindrical portion 43 is connected to the other axial side DD. The centerlines of the fan unit holding portion 41, the first cylindrical portion 42, and the second cylindrical portion 43 coincide with the central axis J of the fan unit 20. As shown in Figure 2, the second cylindrical portion 43 is positioned on the side closer to the cylindrical portion 12 when the fan unit 20 is attached to the handle body 131.

[0050] The second cylindrical portion 43 has a second contact portion 430. The second contact portion 430 has an outer peripheral surface 431 and an axial contact surface 432. The axial contact surface 432 is provided at the end of the second cylindrical portion 43 on the other axial side DD. The axial contact surface 432 is a plane that extends in a direction perpendicular to the central axis J. The radial thickness of the second cylindrical portion 43 is thinner than the radial thickness of the fan unit holding portion 41. That is, the radial thickness of the fan unit holding portion 41 is thicker than the thickest part of the radial thickness of the first cylindrical portion 42 and the second cylindrical portion 43. As a result, when a compressive force is applied to the vibration-damping member 40, the first cylindrical portion 42 and the second cylindrical portion 43 deflect before the fan unit holding portion 41. This suppresses the fan unit holding portion 41 from contacting the cylindrical portion 12, and suppresses the transmission of vibrations.

[0051] <Assembly of Fan Unit 20> The fan unit 20 has the configuration described above. Next, the fan unit 20 with the vibration-damping member 40 attached will be described.

[0052] The inner diameter of the inner groove 442 of the vibration-damping member 40 is the same as or smaller than the outer diameter of the outer cylinder portion 212 of the fan case 21 of the fan unit 20. Also, the inner diameter of the portion of the inner circumferential surface 441 of the internal space 44 of the vibration-damping member 40 that is adjacent to the inner groove 442 in the axial direction is smaller than the inner diameter of the inner groove 442. Therefore, the vibration-damping member 40 is elastically deformed. As a result, the internal space 44 is expanded. Then, with the internal space 44 expanded, the outer cylinder portion 212 of the fan case 21 of the fan unit 20 is inserted into the internal space 44.

[0053] Then, by returning the vibration-damping member 40 to its original shape, the outer cylindrical portion 212 of the fan case 21 of the fan unit 20 fits into the inner groove 442 of the vibration-damping member 40. As a result, the vibration-damping member 40 is attached in close contact with the outer surface of the outer cylindrical portion 212 of the fan case 21 of the fan unit 20. Consequently, displacement of the vibration-damping member 40 relative to the fan unit 20 due to vibrations during operation of the fan unit 20 is suppressed.

[0054] When the vibration-damping member 40 is attached to the outer circumferential surface of the outer cylindrical portion 212 of the fan case 21 of the fan unit 20, the rotor blade side of the fan unit 20 is positioned on the side of the first cylindrical portion 42 of the vibration-damping member 40.

[0055] <Attaching the fan unit 20 to the housing 10> The mounting of the fan unit 20 to the housing 10 will now be described. The fan unit 20, with the vibration-damping member 40 attached to the outer cylindrical portion 212 of the fan case 21, is inserted into the internal space 1210 of the main body portion 121 of the cylindrical portion 12 from the opening at one end on the axial side DU. As a result, the fan unit 20 with the vibration-damping member 40 attached is inserted into the inner circumferential recess 14 of the main body portion 121.

[0056] The fan unit 20 is initially positioned with the second cylindrical portion 43 of the vibration-damping member 40 inserted into the internal space 1210 of the main body 121. In other words, the second cylindrical portion 43 is positioned axially on the other DD side. Then, as the fan unit 20 is pushed axially on the other DD side, the second cylindrical portion 43 moves from the first recess 141 to the second recess 142. At this time, the outer circumferential surface 431 of the second cylindrical portion 43 comes into contact with the inner circumferential surface of the second recess 142. As a result, when viewed in the direction along the central axis J, the fan unit 20 is positioned radially with respect to the cylindrical portion 12, that is, the housing 10.

[0057] Furthermore, the fan unit holder 41 moves into the first recess 141. The inner diameter of the first recess 141 is larger than the outer diameter of the fan unit holder 41. Therefore, when the fan unit 20 is installed, the outer circumferential surface of the outer cylinder portion 212 of the fan case 21 of the fan unit 20 and the inner circumferential surface of the first recess 141 face each other in the radial direction with a gap 140 in between. In other words, the outer circumferential surface of the outer cylinder portion 212 and the inner circumferential surface of the first recess 141 are in a non-contact state.

[0058] By inserting the fan unit 20 by a certain amount, the axial contact surface 432 of the second cylindrical portion 43 comes into contact with the second contact surface 144 of the second recess 142. That is, the second cylindrical portion 43 has a second contact portion 430 that comes into contact with a part of the inner circumferential recess 14 in the axial and radial directions. At the same time, the holding contact surface 414 of the fan unit holding portion 41 comes into contact with the first contact surface 143 of the second recess 142. In other words, the axial contact surface 432 of the second cylindrical portion 43 comes into contact with the second contact surface 144, and the holding contact surface 414 of the fan unit holding portion 41 comes into contact with the first contact surface 143, thereby positioning the fan unit 20 axially with respect to the main body portion 121 of the cylindrical portion 12.

[0059] As described above, the fan unit 20 is mounted in a position within the internal space 1210 of the main body 121 of the cylindrical portion 12. At this time, a portion of the end of the fan unit 20 on one axial side DU is positioned outside the main body 121 of the cylindrical portion 12. The female threaded portion 124 provided on the lid portion 122 is screwed into the male threaded portion 123 provided on the outer circumferential surface of the main body portion 121. In this way, the lid portion 122 is attached to the end of the main body portion 121 on one axial side DU. By rotating the lid portion 122 around the central axis J, the lid portion 122 moves to the other axial side DD.

[0060] As a result, the first cylindrical portion 42 of the vibration-damping member 40 is positioned inside the inner circumferential recess 15 of the lid portion 122. The inner diameter of the inner circumferential recess 15 of the lid portion is larger than the outer diameter of the first cylindrical portion 42. Therefore, the inner circumferential recess 15 of the lid portion and the first cylindrical portion 42 are radially opposite each other with a gap 150 in between. In other words, the outer circumferential surface of the first cylindrical portion 42 and the inner circumferential surface of the inner circumferential recess 15 of the lid portion are not in contact.

[0061] As the lid portion 122 moves axially to the other DD side, the tapered recess 151 of the inner circumferential recess 15 of the lid portion comes into contact with the tapered portion 421 of the first cylindrical portion 42. That is, the tapered portion 421 of the first contact portion 420 comes into contact with the tapered recess 151 formed in the inner circumferential recess 15 of the lid portion. Also, the first cylindrical portion 42 comes into contact with the inner circumferential recess 15 of the lid portion. As a result, the tapered portion 421 of the first cylindrical portion 42 is pushed axially and radially from the tapered recess 151. Consequently, the first cylindrical portion 42 is positioned radially and pushed axially to the other DD side. Note that the end face of the first cylindrical portion 42 on one axial DU side and the end face portion 152 of the inner circumferential recess 15 of the lid portion 132 are in contact, but are not limited to this. When the tapered portion 421 and the tapered recess 151 are in contact and an axial force is applied, the end face of the first cylindrical portion 42 on one axial side DU and the end face portion 152 of the inner circumferential recess 15 of the lid portion 132 may not be in contact.

[0062] The tapered portion 421 of the first cylindrical portion 42 is pushed axially by the lid portion 122, which in turn pushes the vibration-damping member 40 axially. As a result, the fan unit 20 to which the vibration-damping member 40 is attached is fixed inside the cylindrical portion 12, that is, inside the housing 10. As the first cylindrical portion 42 is pushed axially, an axial compressive stress acts on the first cylindrical portion 42. At this time, since a thin-walled portion 422 is formed in the first cylindrical portion 42, a bending moment acts on the thin-walled portion 422. As a result, the thin-walled portion 422 is bent. In other words, the thin-walled portion 422 deflects. As a result, the axial compressive stress acting from the lid portion 122 on the first cylindrical portion 42 causes the thin-walled portion 422 to deflect, which suppresses the transmission of compressive stress to the fan unit holding portion 41.

[0063] The deformation of the fan unit holder 41 due to the compressive force transmitted from the first cylindrical portion 42, particularly the deformation of the fan unit holder 41 bulging radially outward, is suppressed. As a result, the fan unit 20 is fixed in the internal space 1210 of the main body portion 121 of the cylindrical portion 12 while the outer circumferential surface of the fan unit holder 41 and the first recess 141 of the inner circumferential recess 14 remain in non-contact. This makes it difficult for vibrations caused by the operation of the fan unit 20 to be transmitted to the housing 10.

[0064] <First variation> Figure 4 is a schematic cross-sectional view of a fan unit 20a having a vibration-damping member 40a of the first modified example. In the fan unit 20a shown in Figure 4, the vibration-damping member 40a, main body 121a, lid 122a, first inner circumferential recess 16, and inner circumferential recess 17 of the lid differ from the vibration-damping member 40, main body 121, lid 122, inner circumferential recess 14, and inner circumferential recess 15 of the lid. In other respects, it has substantially the same configuration as the vibration-damping member 40 shown in Figure 3. Therefore, parts of the fan unit 20a that are substantially the same as those of the fan unit 20 are given the same reference numerals, and detailed descriptions of the same parts are omitted.

[0065] As shown in Figure 4, in the vibration-damping member 40a, the first cylindrical portion 42a is positioned on one axial side DU of the fan unit holding portion 41a, and the second cylindrical portion 43a is positioned on the other axial side DD of the fan unit holding portion 41a. The main body portion 121a is provided with a first inner circumferential recess 16 and a lid inner circumferential recess 17. The fan unit holding portion 41a is positioned in the first inner circumferential recess 16 with a gap 160 in the radial direction.

[0066] Furthermore, the inner circumferential recess 17 of the lid is positioned on one axial side DU relative to the first inner circumferential recess 16. The first cylindrical portion 42a is positioned in the first inner circumferential recess 16 with a gap 170 in the radial direction. The tapered portion 421 of the first cylindrical portion 42a is in contact with the tapered recess 171 of the inner circumferential recess 17 of the lid, and the end face of the first cylindrical portion 42a on the other axial side DD is in contact with the end face portion 172.

[0067] The lid portion 122a has a first contact surface 125, a recessed hole 126, and a second contact surface 127. The first contact surface 125 is a surface that contacts the axial end DU side of the main body portion 121a and is a plane that expands in a direction perpendicular to the central axis J. The recessed hole 126 is recessed from the first contact surface 125 in the axial direction DU side. The second contact surface 127 is formed at the axial end DU side of the recessed hole 126. The second contact surface 127 is a plane that expands in a direction perpendicular to the central axis J.

[0068] The outer circumferential surface of the second cylindrical portion 43a contacts the inner circumferential surface of the recessed hole 126. The flat portion 413 of the fan unit holding portion 41a contacts the first contact surface 125 of the lid portion 122a, and the axial contact surface 432 contacts the second contact surface 127 of the lid portion 122a. As a result, the fan unit 20a is positioned in the radial and axial directions. The tapered portion 421 is pressed axially by the tapered recess 171 of the inner circumferential recess of the lid portion, thereby fixing the fan unit 20a in place.

[0069] Thus, even with a vibration-damping member 40a in which a second cylindrical portion 43a is formed on one axial side DU and a first cylindrical portion 42a is formed on the other axial side DD, vibrations from the fan unit 20a are less likely to be transmitted to the housing 10.

[0070] In the example described above, a thin-walled portion is formed in the first cylindrical portion, but the invention is not limited to this configuration. A thin-walled portion may be formed in the second cylindrical portion, or in both portions.

[0071] <Second variation> Figure 5 is a schematic cross-sectional view of a fan unit 20b having a vibration-damping member 40b of a second modified example. In Figure 5, the shape of the thin-walled portion 422b, the outer recess 423b, and the thick-walled portion 425b of the vibration-damping member 40 differs from that of the thin-walled portion 422, the outer recess 423, and the thick-walled portion 425 of the vibration-damping member 40. The same reference numerals are used for parts of the fan unit 20b that are substantially the same as those of the fan unit 20, and detailed descriptions of these parts are omitted.

[0072] As shown in Figure 5, the vibration-damping member 40b has two thin-walled sections 422b in the first cylindrical section 42b. Each of the two thin-walled sections 422b has one outer recess 423b. In addition, there is a thick-walled section 425b between the two thin-walled sections 422b in the axial direction.

[0073] The outer recess 423b is recessed radially inward from the outer circumferential surface and is annular in shape, continuous in the circumferential direction. The two outer recesses 423b are arranged side by side in the axial direction. Even with this configuration, the deflection of the thin-walled portion 422b suppresses the transmission of compressive stress, making it difficult for vibrations caused by the operation of the fan unit 20b to be transmitted to the housing 10.

[0074] In this modified example, the vibration-damping member 40b has two thin-walled portions 422b, but is not limited to this, and may have three or more. Also, the radial depths of the two outer recesses 423b are the same, but may be different.

[0075] <Third variation> Figure 6 is a schematic cross-sectional view of a fan unit 20c having a vibration-damping member 40c of a third modified example. In Figure 6, the shape of the thin-walled portion 422c and the outer recess 423c of the vibration-damping member 40c differs from that of the thin-walled portion 422 and the outer recess 423 of the fan unit 20. The same reference numerals are used for substantially the same parts of the fan unit 20c as for the fan unit 20, and detailed descriptions of these same parts are omitted.

[0076] As shown in Figure 6, the axial length of the thin-walled portion 422c of the first cylindrical portion 42c is longer than the axial length of the thin-walled portion 422 of the first cylindrical portion 42. This configuration allows for a larger deflection of the thin-walled portion 422c in response to compressive stress. This enhances the effect of reducing the compressive stress transmitted to the fan unit holder portion 41. As a result, contact between the fan unit holder portion 41 and the cylindrical portion 12 due to deformation of the fan unit holder portion 41 is suppressed. Consequently, the effect of making it difficult for vibrations caused by the operation of the fan unit 20c to be transmitted to the housing 10 is enhanced.

[0077] <Fourth variation> Figure 7 is a schematic cross-sectional view of a fan unit 20d having a vibration-damping member 40d of the fourth modified example. In Figure 7, the shape of the thin-walled portion 422d, the inner recess 424, and the thick-walled portion 425d of the vibration-damping member 40 differs from that of the thin-walled portion 422, the outer recess 423, and the thick-walled portion 425d of the vibration-damping member 40. The same reference numerals are used for parts of the fan unit 20d that are substantially the same as those of the fan unit 20, and detailed descriptions of these parts are omitted.

[0078] As shown in Figure 7, the thin-walled portion 422d of the first cylindrical portion 42d has an inner recess 424 that recesses radially outward from the radially inner circumferential surface. The inner recess 424 is formed continuously in the circumferential direction. With this configuration, the thin-walled portion 422d overlaps with the tapered portion 421 in the axial direction. This allows for sufficient compressive stress to be transmitted to fix the fan unit 20d while suppressing deformation of the fan unit holding portion 41. As a result, the fan unit 20d can be securely fixed to the housing 10, and vibrations from the fan unit 20d are less likely to be transmitted to the housing 10.

[0079] <Fifth variation> Figure 8 is a schematic cross-sectional view of a fan unit 20e having a vibration-damping member 40e of the fifth modified example. In Figure 8, the shape of the thin-walled portion 422e, the inner recess 424e, and the thick-walled portion 425e of the vibration-damping member 40e differs from that of the thin-walled portion 422d, the inner recess 424, and the thick-walled portion 425d of the vibration-damping member 40d. The same reference numerals are used for parts of the fan unit 20e that are substantially the same as those of the fan unit 20d, and detailed descriptions of these parts are omitted.

[0080] As shown in Figure 8, the first cylindrical portion 42e has two thin-walled portions 422e. Each of the two thin-walled portions 422e has one inner recess 424e. The inner recess 424e is recessed radially inward from the outer surface and is annular in shape, continuous in the circumferential direction. The two inner recesses 424e are arranged side by side in the axial direction. Furthermore, a thick-walled portion 425e is positioned between the two thin-walled portions 422e in the axial direction. Even with this configuration, deformation of the fan unit holding portion 41 can be suppressed while transmitting sufficient compressive stress to fix the fan unit 20e. As a result, the fan unit 20e can be securely fixed to the housing 10, and vibrations from the fan unit 20e are less likely to be transmitted to the housing 10.

[0081] In this modified example, the first cylindrical portion 42e has two thin-walled portions 422e, but it is not limited to this and may have three or more. Also, the radial depths of the two inner recesses 424e are the same, but they may be different.

[0082] <Sixth variation> Figure 9 is a schematic cross-sectional view of a fan unit 20f having a vibration-damping member 40f of the sixth modified example. In Figure 9, the shape of the thin-walled portion 422f and the inner recess 424f of the vibration-damping member 40f differs from that of the thin-walled portion 422d and the inner recess 424 of the vibration-damping member 40d. The same reference numerals are used for parts of the fan unit 20f that are substantially the same as those of the fan unit 20d, and detailed descriptions of these parts are omitted.

[0083] As shown in Figure 9, the axial length of the thin-walled portion 422f of the first cylindrical portion 42f is longer than the axial length of the thin-walled portion 422f of the first cylindrical portion 42f. This configuration allows for a larger deflection of the thin-walled portion 422f in response to compressive stress. This enhances the effect of reducing the compressive stress transmitted to the fan unit holding portion 41, and suppresses contact between the vibration-damping member 40f and the cylindrical portion 12 due to deformation of the fan unit holding portion 41. As a result, vibrations from the fan unit 20f are less likely to be transmitted to the housing 10.

[0084] <7th variation> Figure 10 is a schematic cross-sectional view of a fan unit 20g having a vibration-damping member 40g of the seventh modified example. In Figure 10, the shape of the thin-walled portion 422g, outer recess 423g, and inner recess 424g of the vibration-damping member 40g differs from that of the thin-walled portion 422d and inner recess 424 of the vibration-damping member 40d. The same reference numerals are used for parts of the fan unit 20g that are substantially the same as those of the fan unit 20d, and detailed descriptions of these parts are omitted.

[0085] As shown in Figure 10, the thin-walled portion 422g of the first cylindrical portion 42g has an outer recess 423g and an inner recess 424g. As shown in Figure 10, the outer recess 423g and the inner recess 424g overlap radially. This configuration allows for appropriate adjustment of the amount of deflection of the thin-walled portion 422g in response to compressive stress. This enhances the effect of reducing the compressive stress transmitted to the fan unit holding portion 41. As a result, deformation of the fan unit holding portion 41 is suppressed, and the effect of suppressing vibration is enhanced.

[0086] In Figure 10, the outer recess 423g and the inner recess 424g are configured to overlap radially, but this is not the only configuration. For example, they may overlap only partially in the radial direction. That is, the outer recess 423g and the inner recess 424g overlap at least partially in the radial direction. Furthermore, one of the outer recess 423g and the inner recess 424g may be longer in the axial direction than the other.

[0087] <8th variation> Figure 11 is a schematic cross-sectional view of a fan unit 20h having a vibration-damping member 40h of the eighth modified example. In Figure 11, the shape of the thin-walled portion 422h, outer recess 423h, and inner recess 424h of the vibration-damping member 40h differs from that of the thin-walled portion 422g, outer recess 423g, and inner recess 424g of the vibration-damping member 40g. The same reference numerals are used for parts of the fan unit 20h that are substantially the same as those of the fan unit 20g, and detailed descriptions of these parts are omitted.

[0088] As shown in Figure 11, the outer recess 423h has a shape that deepens radially toward one side DU in the axial direction. Similarly, the inner recess 424h has a shape that deepens radially toward the other side DD in the axial direction. By forming it in this way, the thin-walled portion 422h is inclined radially inward toward one side DU in the axial direction.

[0089] In the fan unit 20h shown in Figure 11, the thin-walled portion 422h is inclined radially inward as it moves axially toward one side DU. However, it is not limited to this, and may be inclined in the opposite direction. That is, the radial depth of the outer recess 423h may become deeper or shallower as it moves axially from one side DU to the other side DD. Similarly, the radial depth of the inner recess 424h may become deeper or shallower as it moves axially from one side DU to the other side DD. By configuring it in this way, the direction in which the compressive stress due to the deflection of the thin-walled portion 422h acts can be adjusted.

[0090] Furthermore, the thin-walled portion 422h of the fan unit 20h shown in Figure 11 has a constant radial width along the axial direction, but is not limited to this. It may be configured to become thinner or thicker towards one side DU in the axial direction. Alternatively, it may be configured to be thicker in the axial central portion and to become thinner towards one side DU and the other side DD in the axial direction.

[0091] <9th variation> Figure 12 is a schematic cross-sectional view of a fan unit 20i having a vibration-damping member 40i of the ninth modified example. As shown in Figure 12, the shape of the thin-walled portion 422i, outer recess 423i, inner recess 424i, and thick-walled portion 425i of the vibration-damping member 40 differs from that of the thin-walled portion 422, outer recess 423, and thick-walled portion 425 of the vibration-damping member 40. The same reference numerals are used for parts of the fan unit 20i that are substantially the same as those of the fan unit 20, and detailed descriptions of these parts are omitted.

[0092] As shown in Figure 12, the first cylindrical portion 42i has two thin-walled portions 422i. The two thin-walled portions each have an outer recess 423i and an inner recess 424i. The outer recess 423i and the inner recess 424i are arranged side by side in the axial direction. That is, the outer recess 423i and the inner recess 424i are formed axially separated. The two thin-walled portions 422i are connected in the axial direction via a thick-walled portion 425i.

[0093] With this configuration, when compressive stress is applied to the first cylindrical portion 42i, the thin-walled portion 422i deforms both radially outward and inward. Therefore, the first cylindrical portion 42i is less likely to shift radially. In addition, radial shift of the fan unit 20i can be suppressed, and vibrations of the fan unit 20i are less likely to be transmitted to the housing 10.

[0094] In this modified example, the thin-walled portion 422e has one outer recess 423i and one inner recess 424i, but is not limited to this. It may have two of at least one of the outer recess 423i and the inner recess 424i. In this case, the outer recess 423i and the inner recess 424i These are arranged alternately in the axial direction. Also, the radial depths of the outer recess 423i and the inner recess 424i may be the same or different.

[0095] <10th variation> Figure 13 is a schematic diagram of the vibration-damping member 40j of the 10th modified example, viewed from the axial direction. In Figure 13, the vibration-damping member 40j differs from the vibration-damping member 40 in that the outer recess 423j of the thin-walled portion 422j is different. In all other respects, it has substantially the same configuration as the vibration-damping member 40 shown in Figure 3. Therefore, the same reference numerals are used for parts of the vibration-damping member 40j that are substantially the same as those of the vibration-damping member 40, and detailed explanations of these parts are omitted.

[0096] As shown in Figure 13, the outer recesses 423j of the vibration-damping member 40j extend in the circumferential direction. The outer recesses 423j are arranged side by side in the circumferential direction. In other words, the outer recesses 423j are formed discontinuously in the circumferential direction. By adjusting the circumferential length of the outer recesses 423j, the compressive stress transmitted from the first cylindrical portion 42j to the fan unit holding portion 41j can be adjusted.

[0097] In this modified example, the thin-walled portion 422j has an outer recess 423j, but it may also have an inner recess 424j.

[0098] As shown in Figure 13, the fan unit holder portion 41j may have a configuration that includes a plurality of ribs 415 that protrude radially outward and extend axially. The plurality of ribs 415 are arranged in a line in the circumferential direction. The plurality of ribs 415 may also be arranged at equal intervals in the circumferential direction. In other words, the outer circumferential surface of the fan unit holder portion 41j is provided with a plurality of radially protruding ribs 415, and the plurality of ribs 415 are arranged in the circumferential direction. With this configuration, the rigidity of the fan unit holder portion 41j can be ensured while suppressing the radial thickness of the fan unit holder portion 41j.

[0099] <11th variation> Figure 14 is an unfolded view of the vibration-damping member 40k of the 11th modified example, unfolded in the circumferential direction. The vibration-damping member 40k shown in Figure 14 differs from the vibration-damping member 40 in that it has outer recesses 423k and 425k. In all other respects, it has substantially the same configuration as the vibration-damping member 40 shown in Figure 3. Therefore, the same reference numerals are used for parts of the vibration-damping member 40k that are substantially the same as those of the vibration-damping member 40, and detailed descriptions of these parts are omitted.

[0100] As shown in Figure 14, the outer recess 423k of the vibration-damping member 40k extends in the circumferential direction. The outer recesses 423j are arranged side by side in the circumferential direction. That is, the outer recesses 423j are formed discontinuously in the circumferential direction. The outer recess 425k is provided on one axial side DU of the outer recess 423k. The outer recess 425k extends in the circumferential direction. The outer recesses 425k are arranged side by side in the circumferential direction. That is, the outer recesses 425k are formed discontinuously in the circumferential direction. The outer recesses 423k and 425k have at least a portion that overlaps in the axial direction. The discontinuous portion between the outer recesses 423k overlaps with the outer recess 425k in the axial direction. With this configuration, the compressive stress transmitted from the first cylindrical portion 42k to the fan unit holding portion 41k can be adjusted.

[0101] Various technical features disclosed herein can be modified in various ways without departing from the spirit of the technical creation. Furthermore, the multiple embodiments and modifications shown herein may be combined as possible.

[0102] <Summary> The present invention has the following configuration.

[0103] (1) A fan unit disposed inside a cylindrical housing that extends in the axial direction, A fan case having an airflow path through which air flows, A motor fixed inside the aforementioned fan case, The rotor blades are rotated by the motor, The housing has a vibration-damping member that is positioned in an inner circumferential recess formed on the inner circumferential surface of the housing and fixed to the outer circumferential surface of the fan case, The vibration-damping member is A fan unit holding portion that holds at least the outer surface of the fan case, A first cylindrical portion connected to one end of the fan unit holding portion on the axial side, It has a second cylindrical portion connected to the other axial end of the fan unit holding portion, The fan unit holding portion has an outer circumferential surface that faces the inner circumferential recess with a radial gap between them, and a holding portion contact surface at the other end on the axial side that extends in a direction perpendicular to the axial direction and contacts a part of the inner circumferential recess in the axial direction. The first cylindrical portion has a first contact portion that contacts at least a part of the inner circumferential recess in the axial direction, The second cylindrical portion has a second contact portion that contacts a part of the inner circumferential recess in the axial and radial directions, The first cylindrical portion has a thin-walled portion and a thick-walled portion located on at least one of the axial sides of the thin-walled portion and the other axial side, and having a greater radial thickness than the thin-walled portion.

[0104] (2) The inner surface of the fan unit holding portion has an inner groove that is recessed radially outward. The fan unit according to (1), wherein the fan case is housed in the internal groove with the outer surface of the fan case in contact with the inner surface of the fan case.

[0105] (3) The housing has a cylindrical lid portion that can be attached to one end on the axial side, A portion of the inner circumferential recess is an inner circumferential recess of the lid formed on the inner circumferential surface of the lid, The fan unit according to (1) or (2), wherein the first cylindrical portion is in contact with the inner circumferential recess of the lid portion.

[0106] (4) The first contact portion has a tapered portion at one end on the axial side, the outer diameter of which decreases as it moves toward the axial side. The fan unit according to (3), wherein the tapered portion of the first contact portion contacts the tapered recess formed in the inner circumferential recess of the lid portion.

[0107] (5) The fan unit according to any one of (1) to (4), wherein the radial thickness of the fan unit holding portion is greater than the radial thickness of the first cylindrical portion and the second cylindrical portion at their thickest points.

[0108] (6) The outer circumferential surface of the fan unit holder is provided with a plurality of ribs that protrude in the radial direction, The aforementioned plurality of ribs are arranged in the circumferential direction in any of the fan units according to (1) to (5).

[0109] (7) The fan unit according to any one of (1) to (6), wherein the thin-walled portion has an outer recess formed on the outer circumferential surface of the first cylindrical portion.

[0110] (8) The fan unit according to (7), wherein the outer recess is formed continuously in the circumferential direction.

[0111] (9) The fan unit according to (7) or (8), wherein the outer recess has a radial depth that increases or decreases as it moves from one axial side to the other.

[0112] (10) The fan unit according to any one of (1) to (9), wherein the thin-walled portion has an inner recess formed on the inner circumferential surface of the first cylindrical portion.

[0113] (11) The fan unit according to (10), wherein the inner recess is formed continuously in the circumferential direction.

[0114] (12) The fan unit according to (10) or (11), wherein the inner recess has a radial depth that increases or decreases as it moves from one axial side to the other.

[0115] (13) The thin-walled portion has an inner recess formed on the inner circumferential surface of the first cylindrical portion, The fan unit according to any one of (7) to (9), wherein the outer recess and the inner recess overlap in the radial direction in at least a portion of the area.

[0116] (14) The thin-walled portion is an inner recess formed on the inner circumferential surface of the first cylindrical portion, The fan unit according to any one of (7) to (9), wherein the outer recess and the inner recess are formed to be separated in the axial direction.

[0117] (15) A fan unit as described in any of (1) through (14), The housing to which the fan unit is attached has A hair dryer in which the fan unit is attached to the inner surface of the housing via the vibration-damping member. [Industrial applicability]

[0118] According to the present invention, it can be used in hair care devices such as hair dryers. [Explanation of symbols]

[0119] 100 Hair Dryers 10 Housing 11 Duct 11a Air outlet 11b Inlet 12. Cylindrical part 121, 121a Main body 1210 Interior space 122, 122a Lid 123 Male threaded section 124 Female thread section 125 1st contact surface 126 Hole 127 Second contact surface 13 Handle section 14. First inner circumferential recess 140 gap 141 First recess 142 Second recess 143 1st contact surface 144 Second contact surface 15 Lid inner circumference recess 150 gap 151 Tapered recess 152 End section 16. First inner circumferential recess 160 gap 17 Lid inner circumference recess 170 gap 171 Tapered recess 172 End section 20, 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, 20i fan units 21 Fan Case 211 Inner cylinder 212 Outer cylinder 212a Air intake 212b Exhaust port 213 Airflow path 214 Static Wing 22 Moving blade 30 motors 31 shafts 32 rotors 321 Rotor Magnet 33 Status 331 Stator Core 332 Insulators 333 Coil 341, 342 Bearing section 35 Circuit boards 40, 40a, 40b, 40c, 40d, 40e, 40f, 40g, 40h, 40i, 40j, 40k Vibration Isolator 41, 41a, 41j, 41k Fan unit holder 411 First end 412 Second end 413 Plane section 414 Holding part contact surface 415 Rib 42, 42a, 42b, 42c, 42d, 42e, 42f, 42g, 42i, 42j, 42k First cylindrical section 421 Tapered section 422, 422b, 422c, 422d, 422e, 422f, 422g, 422h, 422i, 422j Thin section 423, 423b, 423c, 423g, 423h, 423i, 423j, 423k Outer recess 424, 424e, 424f, 424g, 424h, 424i, 424j, 425k Inner recess 425, 425b, 425c, 425e, 425i Thick wall section 43, 43a 2nd cylinder part 431 Outer surface 432 Axial contact surface 44 Interior space 441 Inner surface 442 Internal groove Af airflow DU axis direction DD axis direction other J central axis

Claims

1. A fan unit positioned inside a cylindrical housing that extends in the axial direction, A cylindrical fan case having an airflow path through which air flows, A motor is located inside the aforementioned fan case, The rotor blades are rotated by the motor, The housing has a vibration-damping member that is positioned in an inner circumferential recess formed on the inner circumferential surface of the housing and positioned on the outer circumferential surface of the fan case, The vibration-damping member is A cylindrical fan unit holding portion that holds at least the outer surface of the fan case, A first cylindrical portion connected to one end of the fan unit holding portion on the axial side, It has a second cylindrical portion connected to the other axial end of the fan unit holding portion, The fan unit holding portion is formed at the end on the other side of the axial direction, extends in a direction perpendicular to the axial direction, and has a holding portion contact surface that contacts a part of the inner circumferential recess in the axial direction. The first cylindrical portion has a first contact portion that contacts at least a part of the inner circumferential recess in the axial direction, The second cylindrical portion has a second contact portion that contacts a part of the inner circumferential recess in the axial and radial directions. The fan unit comprises a first cylindrical portion having a thin-walled portion and a thick-walled portion located on at least one of the axial sides of the thin-walled portion and the other axial side, and having a greater radial thickness than the thin-walled portion.

2. An inner groove recessed radially outward is formed on the inner circumferential surface of the fan unit holding portion. The fan unit according to claim 1, wherein the fan case is housed in such a state that the outer surface of the fan case is in contact with the inner groove.

3. The housing has a detachable cylindrical cover at one end on the axial side, A portion of the inner circumferential recess is an inner circumferential recess of the lid formed on the inner circumferential surface of the lid, The fan unit according to claim 1, wherein the first cylindrical portion is in contact with the inner circumferential recess of the lid portion.

4. The first contact portion has a tapered portion at one end on the axial side, the outer diameter of which decreases as it moves toward the axial side. The fan unit according to claim 3, wherein the tapered portion of the first contact portion contacts a tapered recess formed in the inner circumferential recess of the lid portion.

5. The fan unit according to claim 1, wherein the radial thickness of the fan unit holding portion is greater than the radial thickness of the first cylindrical portion and the second cylindrical portion at their thickest points.

6. The outer circumferential surface of the fan unit holder is provided with a plurality of ribs that protrude in the radial direction. The fan unit according to claim 1, wherein the plurality of ribs are arranged in the circumferential direction.

7. The fan unit according to claim 1, wherein the thin-walled portion has an outer recess formed on the outer circumferential surface of the first cylindrical portion.

8. The fan unit according to claim 7, wherein the outer recess is formed continuously in the circumferential direction.

9. The fan unit according to claim 7, wherein the radial depth of the outer recess increases or decreases as it moves from one axial side to the other.

10. The fan unit according to claim 1, wherein the thin-walled portion has an inner recess formed on the inner circumferential surface of the first cylindrical portion.

11. The fan unit according to claim 10, wherein the inner recess is formed continuously in the circumferential direction.

12. The fan unit according to claim 10, wherein the inner recess has a radial depth that increases or decreases as it moves from one axial side to the other.

13. The thin-walled portion has an inner recess formed on the inner circumferential surface of the first cylindrical portion. The fan unit according to claim 7, wherein at least a portion of the outer recess and the inner recess overlap in the radial direction.

14. The thin-walled portion is an inner recess formed on at least one of the inner circumferential surfaces of the first cylindrical portion. The fan unit according to claim 7, wherein the outer recess and the inner recess are formed to be separated in the axial direction.

15. A fan unit according to any one of claims 1 to 14, The housing to which the fan unit is attached has A hair dryer in which the fan unit is attached to the inner surface of the housing via the vibration-damping member.

Images