Fan unit

Abstract

This provides a fan unit with a simple configuration that can secure space for the adhesive and a flow path for air cooling the fan. [Solution] A fan unit 1 having a fan member 4 having a cup-shaped rotor cover 31 that rotates around a rotation axis X, a cup-shaped boss portion 40 attached to the outer peripheral surface 312a of the rotor cover 31, and a blade member 4 provided on the outer peripheral surface 312a of the boss portion 40, wherein a ring-shaped partition wall 403 is provided on the boss portion 40, the partition wall 403 extends in the direction of the rotation axis and contacts the bottom of the rotor cover 31, dividing the space between the bottom of the boss portion 40 and the bottom of the rotor cover 31 into an inner peripheral region N and an outer peripheral region G, an adhesive reservoir A is provided in the outer peripheral region G, and a communication channel R is formed in the inner peripheral region N that connects the space inside the rotor cover 31 and the space outside the boss portion 40.

Description

Technical Field

[0001] The present invention relates to a fan unit.

Background Art

[0002] Patent Document 1 discloses an axial flow fan in which an adhesive reservoir space for storing an adhesive for bonding members used in the fan is provided.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As disclosed in Patent Document 1, members used in an axial flow fan may be bonded by an adhesive. By the way, in an axial flow fan, an opening through which air flows may be provided in the fan housing in order to cool the internal space. In a conventional axial flow fan, there has been a risk that the adhesive used for bonding members flows into the opening provided in the fan housing and blocks the opening.

[0005] An object of the present disclosure is to provide a fan unit capable of securing an adhesive accommodation space and an air flow path for fan cooling with a simple configuration.

Means for Solving the Problems

[0006] A fan unit according to one aspect of the present disclosure is a cup-shaped rotor cover that rotates around a rotation axis, a fan unit having a blade member having a cup-shaped boss portion attached to an outer peripheral surface of the rotor cover and blade portions provided on an outer peripheral surface of the boss portion. The outer circumferential surface of the rotor cover and the inner circumferential surface of the boss portion are bonded together with an adhesive. A ring-shaped partition wall is provided at the bottom of the boss portion. The partition wall extends in the direction of the rotation axis and contacts the bottom of the rotor cover, dividing the space between the bottom of the boss portion and the bottom of the rotor cover into an inner circumferential region and an outer circumferential region. An adhesive reservoir is provided in the aforementioned outer peripheral region. In the inner circumferential region, a communication channel is formed that connects the through hole provided in the boss portion with the opening provided in the rotor cover, thereby connecting the space inside the rotor cover with the space outside the boss portion. [Effects of the Invention]

[0007] According to the present invention, a fan unit can be provided that can secure a space for containing adhesive and a flow path for air cooling the fan with a simple configuration. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view of a fan unit according to an embodiment of the present disclosure. [Figure 2] Figure 2 is a top view showing a wing member according to an embodiment of the present disclosure. [Figure 3] Figure 3 is a perspective view showing a wing member according to an embodiment of this disclosure. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. For the sake of clarity, the description of components having the same reference numeral as those already described in the description of the embodiments will be omitted. Furthermore, the dimensions of the components shown in these drawings may differ from the actual dimensions of the components for the sake of clarity.

[0010] The fan unit 1 according to the embodiment of this disclosure will be described with reference to Figures 1 and 2. Note that U, D, R, and L shown in Figure 1 indicate directions within the fan unit 1, where U is upward, D is downward, R is to the right, and L is to the left.

[0011] Figure 1 is a cross-sectional view showing an example of the internal structure of a fan unit 1 according to an embodiment of the present disclosure. As shown in Figure 1, the fan unit 1 according to an embodiment of the present disclosure is a fan capable of generating airflow from downward D to upward U as shown in Figure 1. The fan unit 1 includes a casing 2, a motor 3, and a blade member 4 that rotates around a rotation axis X relative to the casing 2.

[0012] The casing 2 has a box shape, and the motor 3 and the blade member 4 are arranged in the internal space formed by the casing 2.

[0013] The motor 3 can rotate the blade member 4, which will be described later, around the rotation axis X. The motor 3 has a rotor 30, a stator 33, and a rotating shaft portion 34. In this embodiment, the motor 3 is an outer rotor type motor 3 in which the rotor 30 rotates around the stator 33. The rotor 30 has a rotor cover 31 and a magnet 32 ​​provided on the inner circumferential surface of the rotor cover 31.

[0014] The rotor cover 31 is a cup-shaped member that can rotate around the rotation axis X. The rotor cover 31 has a rotor cover bottom 311 and a rotor cover side portion 312 that extends from the outer circumference of the rotor cover bottom 311 in the direction of the rotation axis X. The rotor cover bottom 311 and the rotor cover side portion 312 form the cup shape of the rotor cover 31. An opening 313 is provided in the rotor cover bottom 311.

[0015] The stator 33 is a non-rotatable member that is indirectly fixed to the casing 2. A coil (not shown) is provided in the stator 33, and the motor 3 can magnetize the stator 33 by passing an electric current through the coil and rotate the rotor 30 around the rotation axis X. The rotary shaft portion 34 is a member that is fixed to the rotor cover 31 and extends along the rotation axis X.

[0016] The blade member 4 is a member that is fixed to the rotor cover 31 and is rotatable around the rotation axis X together with the rotor 30. The blade member 4 has a boss portion 40 and blade portions 41 extending from the boss portion 40.

[0017] The boss portion 40 is a cup-shaped member that is fixed to the rotor 30. The boss portion 40 is configured to be able to accommodate the rotor cover 31 in a cup-shaped space. The boss portion 40 has a boss bottom portion 401 that is circular in top view, a boss side surface portion 402 that extends in the direction of the rotation axis X from the boss bottom portion 401 to form a cup shape, a partition wall 403, and a through hole 404. An opening 50 that can accommodate a part of the rotor cover 31 is provided in the boss bottom portion 401. The boss side surface portion 402 extends from the outer periphery of the boss bottom portion 401 to cover the outer periphery of the rotor cover side surface portion 312.

[0018] The boss portion 40 is fixed to the rotor cover 31 by adhering the inner peripheral surface 402a of the boss side surface portion 402 and the outer peripheral surface 312a of the rotor cover side surface portion 312 with an adhesive. The adhesion between the boss portion 40 and the rotor cover 31 is achieved by applying an adhesive to the inner peripheral surface 402a of the boss side surface portion 402 and then accommodating the rotor cover 31 in the cup-shaped space of the boss portion 40. Note that the adhesion between the boss portion 40 and the rotor cover 31 may also be achieved by introducing an adhesive between the boss side surface portion 402 and the rotor cover side surface portion 312 in a state where the rotor cover 31 is accommodated in the boss portion 40.

[0019] As shown in FIG. 1, the partition wall 403 is a member extending from the boss bottom 401 toward the rotor cover 31. The partition wall 403 extends from the boss bottom 401 toward the rotor cover 31 and contacts the rotor cover bottom 311, forming an adhesive reservoir A between the boss bottom 401 and the boss side surface 402. The adhesive reservoir A can receive and store the surplus adhesive that was not used for adhesion among the adhesives introduced for the adhesion between the rotor cover 31 and the boss portion 40. The adhesive reservoir A is provided in an annular shape generally along the boss bottom 401 in a top view (see FIG. 2).

[0020] The through-hole 404 is a hole opening at the boundary between the boss bottom 401 and the boss side surface 402. A part of the opening of the through-hole 404 is provided along the partition wall 403 (see FIG. 3). The through-hole 404 is a hole forming a communication flow path R that connects the inside and the outside of the boss portion 40. One opening of the through-hole 404 in the present embodiment opens at least at a location where the partition wall 403 is provided among the boundary between the boss bottom 401 and the boss side surface 402 (see FIG. 3). The other opening of the through-hole 404 is provided to open to the outside of the boss portion 40. The through-hole 404 opens along the radial direction of the boss portion 40. By forming the communication flow path R that connects the inside and the outside of the boss portion 40, the through-hole 404 can take in the air outside the boss portion 40 into the inside of the boss portion 40 through the communication flow path R.

[0021] As described above, an opening 313 is provided in the rotor cover bottom 311 of the rotor cover 31. As shown by the arrow W in FIG. 1, the fan unit 1 according to the present embodiment can discharge the air inside the fan unit 1 to the outside of the fan unit 1 through the through-hole 404 provided in the boss portion 40 and the opening 313 provided in the rotor cover 31. More specifically, the air inside the boss portion 40 and the air inside the rotor cover 31 can be discharged to the outside of the fan unit 1.

[0022] Similarly, as indicated by arrow W in Figure 1, the fan unit 1 according to this embodiment can take in air from outside the fan unit 1 into the fan unit 1 through the through hole 404 provided in the boss portion 40 and the opening 313 provided in the rotor cover 31. More specifically, air from outside the fan unit 1 can be taken into the interior of the boss portion 40 and the interior of the rotor cover 31.

[0023] In the fan unit 1, the partition wall 403 is in contact with the rotor cover bottom 311, separating the space between the boss bottom 401 and the rotor cover bottom 311 into an inner circumferential region N and an outer circumferential region G. As shown in Figure 1, the adhesive reservoir A is provided in the outer circumferential region G. In addition, at least a portion of the opening of the through hole 404 shown in Figure 1 is provided in the partition wall 403 (see Figure 3), connecting the inner circumferential region N with the outside of the boss portion 40 (see Figure 1).

[0024] Thus, the fan unit 1 according to this disclosure can separate the outer peripheral region G, where the adhesive reservoir A is provided, from the inner peripheral region N, which faces the opening of the through hole 404, by a single partition wall 403.

[0025] When bonding the rotor cover 31 and the blade member 4 with adhesive, the adhesive is applied to the inner circumferential surface 402a of the boss portion 40 of the blade member 4 before bonding it to the rotor cover 31. At this time, any adhesive that flows down from the bonding area flows into the bottom portion 401 of the boss portion 40. Therefore, the boss portion 40 of the fan unit 1 according to this disclosure is provided with an adhesive reservoir A to retain excess adhesive.

[0026] Furthermore, since the inside of the fan unit 1 (the inside of the rotor cover 31 and the inside of the blade member 4) generates heat during operation of the fan unit 1, a configuration is needed to expel the hot air inside the fan unit 1 to the outside and draw in air from the outside to cool the fan unit. For this reason, the boss portion 40 of the fan unit 1 according to this disclosure is provided with a through hole 404 that extends outward from the boss portion 40. This creates a communication channel R through which air flows from the through hole 404 to the space inside the rotor cover 31 through an opening 313 provided in the bottom portion 311 of the rotor cover.

[0027] Here, when bonding the rotor cover 31 and the blade member 4 with adhesive, if the adhesive that flows in also flows into the communication channel R, there was a risk that the through hole 404 would be blocked by the adhesive, preventing the communication channel R from functioning properly.

[0028] The fan unit 1 according to this disclosure is provided with a partition wall 403 that separates the space between the boss bottom 401 of the boss portion 40 and the rotor cover bottom 311 of the rotor cover 31 into an inner circumferential region N and an outer circumferential region G. As a result, the outer circumferential region G, where the adhesive reservoir A is provided, and the inner circumferential region N, which faces the opening of the through hole 404, are separated by a common partition wall 403, so that both the space for the adhesive reservoir A and the space where the through hole 404 opens can be secured with a simple configuration. This makes it possible to maximize the space for both the adhesive reservoir A and the communication channel R.

[0029] Next, the blade member 4 in this embodiment will be described in detail with reference to Figures 2 and 3. Figure 2 is a top view showing an example of the blade member 4 according to the embodiment of this disclosure.

[0030] As shown in Figure 2, the partition wall 403 in this embodiment has a ring shape centered on the axis of rotation X when viewed from above. Even when viewed from above, the partition wall 403 separates the boss bottom 401 into an outer peripheral region G and an inner peripheral region N. The outer peripheral region G is the area enclosed by the dashed line in Figure 2. The inner peripheral region N is the area enclosed by the thick line in Figure 2. As shown in Figure 2, the adhesive reservoir A is provided in the outer peripheral region, and the through hole 404 opens to the inner peripheral region N. In Figure 2, the adhesive reservoir A is the area indicated by hatching.

[0031] Figure 3 is a perspective view showing a wing member according to an embodiment of the present disclosure. As shown in Figures 2 and 3, the partition wall 403 has a first wall portion 403A and a second wall portion 403B. The second wall portion 403B is provided radially outward compared to the first wall portion 403A. Furthermore, in a top view, the partition wall 403 is provided such that the first wall portion 403A and the second wall portion 403B are arranged alternately along the circumferential direction.

[0032] In this embodiment, at least a portion of the opening of the through-hole 404 is provided in a position facing the second wall portion 403B. From a fluid dynamics viewpoint, it is preferable that the through-hole 404 be provided as far outward as possible in the radial direction in order to more efficiently discharge the air inside the fan unit 1 to the outside of the fan unit 1. In other words, it is preferable that the partition wall 403 in which the through-hole 404 is provided be provided as far outward as possible in the radial direction. On the other hand, with respect to the adhesive reservoir A, it is preferable that the partition wall 403 be provided as far inward as possible in the radial direction in order to store as much adhesive as possible.

[0033] In order to solve the above conflicting problems at once, the inventor has configured the partition wall 403 according to this disclosure to have a first wall portion 403A and a second wall portion 403B provided radially outward from the first wall portion.

[0034] In this embodiment, the second wall portion 403B of the fan unit 1 is located radially outward from the first wall portion 403A, thereby improving the efficiency of air intake through the through hole 404. Furthermore, the first wall portion 403A of the fan unit 1 in this embodiment is located radially inward from the second wall portion 403B. This increases the volume of the adhesive reservoir A, preventing the adhesive from flowing into the communication channel R.

[0035] It should also be said that the partition wall 403 in this embodiment has a recess 403A and a protrusion 403B, rather than a first wall portion 403A and a second wall portion 403B. In this embodiment, when the boss portion 40 of the fan unit 1 is viewed from the direction of the rotation axis X, the partition wall 403 can also be described as having a configuration in which a protrusion 403B and a recess 403A located radially inward from the protrusion 403B are alternately provided in the circumferential direction.

[0036] As shown in Figures 2 and 3, in this embodiment, the boss portion 40 has a plurality of reinforcing ribs 405 that extend radially outward from the rotation center point. The reinforcing ribs 405 straddle the first wall portion 403A and are provided spanning from the inner circumferential region N to the outer circumferential region G. The fan unit 1 according to this embodiment can improve the overall strength of the blade member 4 by having the reinforcing ribs 405 configured as described above. Furthermore, since the reinforcing ribs 405 are provided so as to straddle the first wall portion 403A, they do not block the through holes 404 provided in the second wall portion 403B.

[0037] Furthermore, as shown in Figure 3, the height of the reinforcing rib 405 in the direction of the rotation axis X at the point where it contacts the partition wall 403 is lower than that of the partition wall 403. For example, even if an excess of adhesive is applied to a part of the boss side portion 402, the excess adhesive that reaches the adhesive reservoir A will exceed the reinforcing rib 405 before exceeding the partition wall 403. Since the adhesive reservoir A is provided in an annular shape that is roughly along the boss bottom 401 when viewed from above (see Figure 2), the excess adhesive can be contained by the entire annular adhesive reservoir A.

[0038] As shown in Figure 3, in this embodiment, the boss side portion 402 is composed of a curved surface that protrudes toward the rotor cover side portion 312 (see Figure 1), which is located radially inward from the boss side portion 402. More specifically, the inner circumferential surface 402a of the boss side portion 402 has a shape in which a plate-like member 500 having a curved surface that protrudes toward the rotor cover side portion 312 (see Figure 1) is attached in the circumferential direction. With the above configuration, there are areas where the boss side portion 402 and the rotor cover side portion 312 come into contact with each other and areas where they do not come into contact and form a gap, so that the adhesive can be efficiently spread around the entire circumference of the rotor cover side portion 312, thereby increasing the adhesion efficiency of the adhesive.

[0039] While embodiments of this disclosure have been described above, it goes without saying that the technical scope of this disclosure should not be interpreted restrictively by the description of these embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications to the embodiments are possible within the scope of the invention described in the claims. The technical scope of this disclosure should be determined based on the scope of the invention described in the claims and the scope of its equivalents. [Explanation of Symbols]

[0040] 1 Fan Unit 2 Casing 3 motors 4 blade members 30 rotors 31 Rotor Cover 32 magnets 33 Status 34 Rotating shaft section 40 Boss Section 41. Wing section 311 Rotor cover bottom 312 Rotor cover side section 312a Outer surface 313 Opening 401 Boss Bottom 402 Boss side section 402a Inner surface 403 Partition wall 403A First wall section, recess 403B Second wall section, protrusion section 404 Through hole 405 Reinforcement Rib 500 Plate-shaped member

Claims

1. A cup-shaped rotor cover that rotates around the axis of rotation, A fan unit having a blade member having a cup-shaped boss portion attached to the outer circumferential surface of the rotor cover and a blade portion provided on the outer circumferential surface of the boss portion, The outer circumferential surface of the rotor cover and the inner circumferential surface of the boss portion are bonded together with an adhesive. A ring-shaped partition wall is provided at the bottom of the boss portion. The partition wall extends in the direction of the rotation axis and contacts the bottom of the rotor cover, dividing the space between the bottom of the boss portion and the bottom of the rotor cover into an inner circumferential region and an outer circumferential region. An adhesive reservoir is provided in the aforementioned outer peripheral region. A fan unit in which a communication channel is formed in the inner circumferential region, connecting a through hole provided in the boss portion and an opening provided in the rotor cover, thereby connecting the space inside the rotor cover and the space outside the boss portion.

2. The fan unit according to claim 1, wherein the through hole is opened along the radial direction.

3. The partition wall comprises a first wall portion and a second wall portion provided radially outward from the first wall portion. The fan unit according to claim 1, wherein the through hole is provided in the second wall portion.

4. When the boss portion is viewed from the direction of the rotation axis, the ring-shaped partition wall is, The convex part, The fan unit according to claim 1, wherein recesses located radially inward from the aforementioned protrusions are alternately provided in the circumferential direction.

5. The fan unit according to claim 3, wherein a plurality of reinforcing ribs are provided that extend radially across the second wall portion.

6. The fan unit according to claim 5, wherein the height of the reinforcing rib in the direction of the rotation axis is lower than that of the partition wall.

7. The fan unit according to claim 1, wherein either the outer circumferential surface of the rotor cover or the inner circumferential surface of the boss portion is composed of a curved surface that protrudes toward the other, and the other is composed of a plurality of planes.

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