Reversible Fan

Abstract

To provide a reversible fan of which noise characteristics during blowing in a positive direction approximates noise characteristics during blowing in a reverse direction.SOLUTION: A reversible fan for generating an air flow both in a positive direction and in a reverse direction includes an impeller 2 rotatable around a rotation axis X, a motor 3 for rotating the impeller 2, a base part 4 supporting the motor 3, a cylindrical frame 5 extending along the rotation axis X and storing the impeller 2, the motor 3, and the base part 4, and a spoke 6 extending from an inner peripheral face of the frame 5 to the rotation axis X and supporting the base part 4. At least a part of a lead wire L for energizing the motor 3 is provided along the spoke 6 and locked by a lock part 10 provided on the spoke 6. In the lock part 10, a groove-shaped storage space 11 is provided which opens toward the reverse direction and extends along the spoke 6.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a reversible fan. [Background technology]

[0002] 2. Description of the Related Art A reversible fan that generates airflow in both forward and reverse directions is known, as disclosed in Patent Document 1 and the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6802022 Summary of the Invention [Problem to be solved by the invention]

[0004] By the way, such a reversible fan may be attached to the wall of a house, for example, and used to raise the room temperature by taking in outside air when the outside air is warmer, and to lower the room temperature by expelling indoor air when the indoor temperature is high. In this case, if the noise generated when taking in outside air differs from the noise generated when expelling indoor air, residents may suspect that the fan is broken.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a reversible fan whose noise characteristics when blowing air in the forward direction are similar to those when blowing air in the reverse direction. [Means for solving the problem]

[0006] A reversible fan according to one aspect of the present invention includes: A reversible fan that generates airflow in both forward and reverse directions, An impeller rotatable about a rotation axis; A motor that rotates the impeller; A base portion supporting the motor; a cylindrical frame that accommodates the impeller, the motor, and the base portion; spokes extending from an inner circumferential surface of the frame toward the rotation axis and supporting the base portion, At least a portion of a lead wire for supplying current to the motor is provided along the spoke and is secured by a stop provided on the spoke; The stopper portion is provided with a groove-shaped receiving space that opens in the opposite direction and extends along the spoke. Effect of the Invention

[0007] According to the present invention, it is possible to provide a reversible fan whose noise characteristics when blowing air in the forward direction are similar to those when blowing air in the reverse direction. [Brief description of the drawings]

[0008] [Figure 1] 1 is a front perspective view of a reversible fan according to an embodiment of the present invention; FIG. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] 10 is a partial enlarged view showing the stopper portion and the retainer portion provided on the spoke. FIG. [Figure 4] 13 is a partial enlarged view showing a retaining portion provided on a spoke. FIG. [Diagram 5] FIG. 13 is a diagram showing the flow of air when air is blown in the opposite direction. [Figure 6] FIG. 13 is a diagram showing the flow of air when air is blown in the forward direction. [Figure 7] FIG. 4 is a perspective view showing a lead wire fixing portion provided on a frame. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. For the sake of convenience, the description of the components having the same reference numbers as those already described in the description of the embodiment will be omitted. Also, for the sake of convenience, the dimensions of each component shown in the drawings may differ from the actual dimensions of each component.

[0010] FIG. 1 is a perspective view of a reversible fan 1 according to an embodiment of the present invention, as viewed from the front side. In the following description, the side from which air is blown out when a motor provided in the reversible fan 1 rotates counterclockwise is referred to as the front side of the reversible fan 1, and the side from which air is blown out when the motor rotates clockwise is referred to as the rear side of the reversible fan 1. In the reversible fan 1 shown in FIG. 1, the left side is the front side and the right side is the rear side. In the reversible fan 1 shown in FIG. 1, the direction toward the front side along the direction of the rotation axis X (the direction of the arrow N) is referred to as the "forward direction," and the direction toward the rear side along the rotation axis X (the direction of the arrow R) is referred to as the "reverse direction."

[0011] The reversible fan 1 is a fan that can blow air (generate airflow) in both the forward and reverse directions. As shown in Fig. 1, the reversible fan 1 comprises an impeller 2 that can rotate around a rotation axis X, a motor 3 that rotates the impeller 2, a base 4 that supports the motor 3, and a cylindrical frame 5 that houses these components. The impeller 2, motor 3, and base 4 are arranged so as to overlap along the direction of the rotation axis X.

[0012] The impeller 2 is formed in a generally cup shape. A plurality of blades 2a are attached radially around the periphery of the impeller 2. The blades 2a attached to the impeller 2 are inclined with respect to the axial direction of the rotating shaft of the reversible fan 1 (the same direction as the rotation axis X). The impeller 2 generates an airflow in the forward or reverse direction by the rotation of the blades 2a.

[0013] The motor 3 is provided inside the impeller 2. The motor 3 is, for example, an outer rotor type brushless motor. The motor 3 has a stator and a rotor arranged on the outer periphery of the stator. The motor 3 inside the impeller 2 has a rotor portion fixed to the impeller 2. The motor 3 is assembled inside the impeller 2 so as to be located on the front side (positive direction side) of the impeller 2.

[0014] The base portion 4 is formed, for example, in a circular cup shape. The base portion 4 is provided so as to cover the positive direction side of the motor 3. The base portion 4 supports a stator portion of the motor 3. The base portion 4 is assembled in the frame 5 so as to be disposed on the front side of the motor 3.

[0015] The base portion 4 is supported by a plurality of spokes 6. The spokes 6 are provided to extend from the inner peripheral surface of the frame 5 toward the rotation axis X and are connected to the peripheral portion of the base portion 4. In other words, the spokes 6 extend radially from the peripheral portion of the base portion 4 and are connected to the inner peripheral surface of the frame 5. The base portion 4 supported by the spokes 6 is attached at a position close to the front side (the front side of the reversible fan 1) of the cylindrical frame 5 extending along the rotation axis X.

[0016] The spokes 6 supporting the base portion 4 are formed to have a flat cross-sectional shape that is long in a direction substantially along the rotation axis X, i.e., in the direction in which the airflow is generated. The spokes 6 are formed to reduce their surface area when viewed from the direction of the rotation axis X. The spokes 6 are provided with a stopper portion 10 and a retaining portion 20 for retaining a lead wire (not shown) that supplies power to the motor 3. The stopper portion 10 and the retaining portion 20 are provided on a given spoke 6 at a position where the lead wire is wired. In this example, the stopper portion 10 and the retaining portion 20 are provided on two spokes 6.

[0017] The frame 5 has a main body portion 51 forming a cylindrical portion, and flange portions 52 (52a, 52b) provided on the outer periphery of both ends of the main body portion 51.

[0018] Next, the stopper portion 10 and the retainer portion 20 provided on the spoke 6 will be described with reference to FIGS.

[0019] Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. Fig. 3 is a partially enlarged view showing a spoke 6 on which a stopper portion 10 and a pressing portion 20 are provided. 2 and 3, the stopper 10 is provided so as to protrude from the tip of the spoke 6 in the forward direction (arrow N direction) that is long and flat along the direction of the rotation axis X in a direction intersecting the rotation axis X, and further extend in the reverse direction (arrow R direction). The stopper 10 is provided so as to have a convex shape facing in the forward direction.

[0020] The stopper 10 is provided with an accommodation space 11 for accommodating the lead wire L for power supply wired along the spoke 6. The stopper 10 forms the accommodation space 11 between itself and the long, flat side surface of the spoke 6. The accommodation space 11 is formed in a groove shape that opens in the reverse direction. The accommodation space 11 is formed in a groove shape that extends along the length of the spoke 6, that is, in a groove shape that has a width in the wiring direction of the lead wire L wired along the spoke 6. The width of the stopper 10 is formed to be 1 / 10 or more and less than 1 / 3 of the length of the spoke 6 in the radial direction of the reversible fan 1. The stopper 10 is provided so that the convex portion is on the forward side and the portion that is the opening of the accommodation space 11 is on the reverse side.

[0021] FIG. 4 is a partial enlarged view showing the retaining portion 20 provided on the spoke 6. As shown in FIG. 3 and 4, the retaining portion 20 is provided so as to protrude in a direction intersecting the rotation axis X from the end portion in the opposite direction (the direction of the arrow R) of the spoke 6 which is long and flat along the direction of the rotation axis X. The retaining portion 20 is a member which prevents the lead wire L housed in the housing space 11 from slipping out from the opening of the housing space 11. The retaining portion 20 is provided so as to cooperate with the stopper portion 10 to surround the periphery of the lead wire L.

[0022] Next, the flow of air in the reversible fan 1 will be described with reference to Figures 5 and 6. Figure 5 is a diagram showing the flow of air when the reversible fan 1 blows air in the reverse direction. Figure 6 is a diagram showing the flow of air when the reversible fan 1 blows air in the forward direction.

[0023] 5, when reversible fan 1 blows air in the reverse direction, air is sucked in from the opening on the forward side of frame 5, where it collides with the convex sides of stoppers 10, against spokes 6 on which stoppers 10 are attached, and is then sucked into frame 5. For this reason, as shown by arrows B1 and B2, for example, air is sucked into frame 5 smoothly along the outer circumferential surface of stoppers 10 without being disturbed in its flow. This reduces the generation of noise caused by the stoppers 10 obstructing the air flow.

[0024] As shown in Figure 6, when reversible fan 1 blows air in the forward direction, air sucked in from the opening on the reverse side of frame 5 hits the opening side of spoke 6 on which stopper 10 is attached when it is discharged from the opening on the forward side. For this reason, as shown by arrows C1 and C2, for example, the air flow is obstructed by the opening of accommodation space 11 of stopper 10 and cannot flow smoothly. At this time, noise is generated when the air flow is obstructed by stopper 10.

[0025] 7 is a perspective view showing the lead wire fixing portion 30 provided on the frame 5 of the reversible fan 1. The lead wire fixing portion 30 is a portion for further fixing the lead wire L held down by the stopper portion 10 and the holding portion 20 of the spoke 6.

[0026] As shown in FIG. 7, the lead wire fixing portion 30 has a protrusion 31 and a mounting groove 32. The protrusion 31 is provided on a bottom surface 53 located at the end on the positive side of the main body 51 of the frame 5. The protrusion 31 is provided so as to protrude from the bottom surface 53 towards the base portion 4 (towards the center of the reversible fan 1).

[0027] The mounting groove 32 is provided in the flange portion 52a on the positive side of the frame 5. The mounting groove 32 is formed to extend in the radial direction and cross the flange portion 52a. The mounting groove 32 is formed to penetrate the flange portion 52a and open on the reverse side of the flange portion 52a.

[0028] The mounting groove 32 is provided so as to span from the protruding portion 31 to the flange portion 52a. The mounting groove 32 is provided so as to extend radially in the approximate center of the protruding portion 31, and separates the protruding portion 31 into two in the circumferential direction. The mounting groove 32 has a straight portion 33 extending radially and a bent portion 34 bent with respect to the radial direction. The straight portion 33 is provided in the flange portion 52a. The bent portion 34 is provided in the protruding portion 31. The groove of the bent portion 34 is formed to a depth such that it bites into the bottom surface 53 on which the protruding portion 31 is provided and a part of the main body portion 51 continuous with the bottom surface 53.

[0029] The lead wire L held down by the stopper portion 10 and the holding portion 20 of the spoke 6 is passed through the bent portion 34 and the straight portion 33 of the mounting groove 32 so as to be hooked onto the protrusion 31, and then passed through the opening of the flange portion 52a to be wired.

[0030] In this embodiment, the lead wire L is fixed by providing both the stopper 10 and the mounting groove 32, but the present invention is not limited to this. For example, only one of the stopper 10 or the mounting groove 32 may be provided, and the lead wire L may be fixed by the stopper 10 alone or the mounting groove 32 alone.

[0031] In the reversible fan 1 according to this embodiment, the lead wires L for supplying electricity to the motor 3 are wired along the spokes 6, and stoppers 10 for stopping the lead wires L are provided on the spokes 6. The stoppers 10 are provided with storage spaces 11 for storing the lead wires L between them and the spokes 6, and the storage spaces 11 are groove-shaped and open in the reverse direction and extend along the spokes 6. Therefore, when the airflow in the forward direction hits the stoppers 10, the flow is disturbed by the storage space 11 that opens in the reverse direction, generating noise. In this way, the noise generated when the airflow in the forward direction is increased, and the noise characteristics when blowing air in the forward direction can be made to approach the noise characteristics when blowing air in the reverse direction.

[0032] Furthermore, with the reversible fan 1, the stoppers 10 are formed so that they protrude from the forward end of the spokes 6, which are long and flat in the direction along the rotation axis X, in a direction intersecting the rotation axis X and then extend in the reverse direction, forming a convex shape facing the forward direction. As a result, the airflow that hits the stoppers 10 during reverse airflow can be made to flow smoothly along the convex shape without increasing noise characteristics, making it easy to align the noise characteristics during forward airflow and the noise characteristics during reverse airflow.

[0033] Furthermore, with the reversible fan 1, the fastening portions 10 are formed to be greater than or equal to 1 / 10 and less than 1 / 3 the radial dimension of the spokes 6. This allows the lead wires L to be securely fastened, and the noise characteristics during forward airflow can be made closer to the noise characteristics during reverse airflow.

[0034] Furthermore, according to the reversible fan 1, the spokes 6 are provided with retaining portions 20 that prevent the lead wires L housed in the housing spaces 11 from slipping out through the openings, and the retaining portions 20 protrude from the opposite ends of the spokes 6 in a direction intersecting the rotation axis X. Therefore, together with the stoppers 10, the lead wires L are surrounded, further preventing the lead wires L housed in the housing spaces 11 from slipping out.

[0035] Furthermore, according to the reversible fan 1, the frame 5 is provided with a protrusion 31 that protrudes toward the base portion 4 on the bottom surface 53 located at the end on the positive side of the main body portion 51, and a mounting groove 32 for fixing the lead wire L is provided extending radially from the protrusion 31 to the flange portion 52a. The mounting groove 32 is formed so as to open in the opposite direction at the flange portion 52a and to form a bent portion 34 that is bent radially at the protrusion 31. For this reason, by maintaining the shapes of the bent portion 34 and the protrusion 31 as they are and varying the size of the flange portion 52a, it is possible to design frames 5 of different sizes, making it easy to expand the size range.

[0036] Although the embodiment of the present invention has been described above, it goes without saying that the technical scope of the present invention should not be interpreted as being limited by the description of the embodiment. The embodiment is merely an example, and it is understood by those skilled in the art that various modifications of the embodiment are possible within the scope of the invention described in the claims. The technical scope of the present invention should be determined based on the scope of the invention described in the claims and its equivalents. [Explanation of symbols]

[0037] 1 Reversible Fan 2 Impeller 2a Feather 3 Motor 4 Base 5 Frames 6 spokes 10 Stopper 11 Containment Space 20 Retaining part 30 Lead wire fixing part 31 Protrusion 32 Mounting groove 33 Straight section 34 Bend 51 Main body 52 (52a, 52b) Flange portion L Lead Wire X rotation axis

Claims

1. A reversible fan that generates airflow in both forward and reverse directions, An impeller rotatable about a rotation axis; A motor that rotates the impeller; A base portion supporting the motor; a cylindrical frame that accommodates the impeller, the motor, and the base portion; spokes extending from an inner circumferential surface of the frame toward the rotation axis and supporting the base portion, At least a portion of a lead wire for supplying current to the motor is provided along the spoke and is secured by a stop provided on the spoke; The stopper portion is provided with a groove-shaped receiving space that opens in the opposite direction and extends along the spoke, The spokes have a flat cross-sectional shape that is elongated in a direction substantially along the rotation axis, A reversible fan, wherein the stopper protrudes from the positive end of the spoke in a direction intersecting the rotation axis and further extends in the reverse direction.

2. The reversible fan according to claim 1 , wherein the stopper portion has a convex shape facing the positive direction.

3. The reversible fan according to claim 1 , wherein the spokes are provided with a retaining portion that prevents the lead wires housed in the housing space from slipping out of the opening.

4. The reversible fan according to claim 3 , wherein the retaining portion protrudes from the opposite end of each of the spokes in a direction intersecting the axis of rotation.

5. The reversible fan according to claim 1 , wherein the stop portion is greater than or equal to 1 / 10 and less than 1 / 3 of a radial dimension of the spoke.

6. The frame has a main body portion forming a cylindrical portion and a flange portion provided on an outer periphery of the main body portion, a protrusion protruding toward the base portion is provided on a bottom surface of the main body portion located at an end portion in the positive direction, a mounting groove for fixing the lead wire, the mounting groove extending in a radial direction and opening in the reverse direction, is provided on a bottom surface located at an end of the frame in the positive direction; The reversible fan according to claim 1 , wherein the mounting groove is provided at a position spanning from the protruding portion to the flange portion.

7. The mounting groove has a linear portion extending in the radial direction and a bent portion bent with respect to the radial direction, The reversible fan according to claim 6 , wherein the bent portion is provided on the protruding portion.

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