Fan attachment / detachment device

Abstract

To provide an improved attachment / detachment device for a fan.SOLUTION: An attachment / detachment device 10 for a fan 6 to / from a rotary shaft 5a of a motor 5 is used for a fan device 4. The attachment / detachment device 10 for the fan 6 includes a base plate member 20 having an insertion hole 21 through which the rotary shaft 5a is inserted, and fixed to the fan 6, a holding mechanism 30 provided on the face of the base plate member 20, directed to the opposite side to the motor 5, and adapted to engage with a lock groove 5b of the rotary shaft 5a to make the rotary shaft 5a hold the base plate member 20, and a fitting mechanism 40 provided on the face of the base plate member 20, directed to the side of the motor 5, and adapted to be fitted to a lock pin 5c provided on the rotary shaft 5a to lock the base plate member 20 to the rotary shaft 5a.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a detaching device for a fan with respect to the rotation shaft of a motor, which is used in a fan device.

Background Art

[0002] Above a cooking appliance such as a stove installed in a kitchen of a building, a range hood is installed. The range hood includes a fan device having a motor and a fan rotationally driven by the motor, and can discharge oil fumes and the like generated during cooking outdoors by the fan device.

[0003] Conventionally, for example, as a fan device used in a range hood, there is known a configuration provided with a detaching device that enables the fan to be detachable with respect to the rotation shaft of the motor in order to facilitate cleaning of oil stains and the like (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above conventional fan device, an improved detaching device for the fan has been demanded.

[0006] The present invention has been made to solve the above problems, and an object thereof is to provide an improved detaching device for a fan.

Means for Solving the Problems

[0007] The fan attachment / detachment device of the present invention is a fan attachment / detachment device for a fan device, relating to the rotating shaft of a motor, and comprises: a substrate member fixed to the fan and having an insertion hole through which the rotating shaft is inserted; a holding mechanism provided on the surface of the substrate member facing away from the motor and engaging with a locking groove on the rotating shaft to hold the substrate member on the rotating shaft; and a fitting mechanism provided on the surface of the substrate member facing the motor and fitting onto a locking pin provided on the rotating shaft to prevent the substrate member from rotating relative to the rotating shaft. The fitting mechanism comprises a fitting groove into which the locking pin fits, and an elastic body mounted on the substrate member that biases the locking pin in a direction that disengages it from the fitting groove. It is characterized by doing so.

[0008] In the fan attachment / detachment device of the present invention, it is preferable that the holding mechanism comprises an engaging portion and an operating portion that engage with the locking groove, and between the engaging portion and the operating portion, a first lever member rotatably supported on the substrate member by a first support shaft, and between the engaging portion and the operating portion, a second lever member comprising an engaging portion and an operating portion that engage with the locking groove, and between the engaging portion and the operating portion, a second lever member rotatably supported on the substrate member by a second support shaft that is point-symmetrically arranged with respect to the first support shaft about the rotation axis. [Effects of the Invention]

[0010] According to the present invention, an improved fan attachment and detachment device can be provided. [Brief explanation of the drawing]

[0011] [Figure 1] This is an explanatory diagram showing the internal structure of a range hood. [Figure 2] This is an exploded side view of a fan device equipped with a fan attachment / detachment device according to one embodiment of the present invention. [Figure 3] Figure 1 is a front view of the fan device. [Figure 4] This is a side view of the fan unit with the fan removed. [Figure 5] This is an explanatory diagram showing the holding mechanism. [Figure 6] This is a perspective view of the holding mechanism with the lever member removed. [Figure 7]It is an explanatory diagram showing a modified example of the lever member. [Figure 8] It is a perspective view of the cover member. [Figure 9] It is an explanatory diagram showing the fitting mechanism. [Figure 10] It is a cross-sectional view taken along the line A-A in FIG. 9. [Figure 11] It is an enlarged view of the fitting groove shown in FIG. 10. [Figure 12] It is an explanatory diagram showing the fitting mechanism in a state where the locking pin 5c of the rotating shaft is fitted into the fitting groove. [Figure 13] It is an explanatory diagram showing a modified example of the elastic body provided in the fitting mechanism. [Figure 14] It is an explanatory diagram showing another modified example of the elastic body provided in the fitting mechanism. [Figure 15] It is an explanatory diagram showing still another modified example of the elastic body provided in the fitting mechanism. [Figure 16] It is an explanatory diagram showing still another modified example of the elastic body provided in the fitting mechanism.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, with reference to the drawings, a fan attaching / detaching device (attaching / detaching mechanism) according to an embodiment of the present invention will be exemplified and described in detail.

[0013] The fan attaching / detaching device according to an embodiment of the present invention is used for a fan device of a range hood.

[0014] The range hood 1 shown in FIG. 1 is installed above a cooking appliance (not shown) such as a stove installed in a kitchen of a building, and includes a hood portion 2 and a duct portion 3, and a fan device 4 is provided inside the duct portion 3.

[0015] As shown in FIG. 2, the fan device 4 has a motor 5 and a fan 6.

[0016] The motor 5 has a rotating shaft 5a, and an annular locking groove 5b extending in the circumferential direction is provided on the outer circumferential surface of the tip side of the rotating shaft 5a. In addition, a pair of locking pins 5c are fixed to the base side of the rotating shaft 5a from the locking groove 5b. Each of the pair of locking pins 5c has a circular cross-section, is arranged point-symmetrically with respect to the axis of the rotating shaft 5a, and faces in a direction perpendicular to the rotating shaft 5a.

[0017] As shown in Figure 3, the fan 6 is equipped with a fan attachment / detachment device 10 (hereinafter sometimes simply referred to as "attachment / detachment device 10") according to one embodiment of the present invention, and is detachably attached to the rotating shaft 5a of the motor 5 by this attachment / detachment device 10. The fan device 4 is driven by the motor 5 to rotate the fan 6, which in turn captures oil fumes and other substances generated during cooking in the hood section 2 and discharges them outdoors through the duct section 3.

[0018] In this embodiment, the range hood 1 is a horizontal type in which the fan device 4 is positioned with the fan 6 facing sideways (the rotation axis 5a of the motor 5 facing horizontally). However, the detachable device 10 of this embodiment can be applied to various range hoods 1 regardless of the orientation of the fan device 4, such as a downward type in which the fan 6 is facing downward (the rotation axis 5a of the motor 5 facing vertically downward), or a diagonal type in which the fan device 4 is positioned with the fan 6 facing diagonally downward (the rotation axis 5a of the motor 5 facing diagonally downward).

[0019] As shown in Figures 3 and 4, the attachment / detachment device 10 includes a substrate member 20, a holding mechanism 30 provided on the side of the substrate member 20 facing away from the motor 5, and a fitting mechanism 40 provided on the side of the substrate member 20 facing the motor 5.

[0020] Thus, the attachment / detachment device 10 of this embodiment has a configuration in which a holding mechanism 30 is provided on one side of the substrate member 20 and a fitting mechanism 40 is provided on the other side, making the attachment / detachment device 10 or the fan device 4 equipped with the attachment / detachment device 10 compact.

[0021] As shown in Figure 3, the substrate member 20 is plate-shaped and has an insertion hole 21 through which the rotating shaft 5a of the motor 5 is inserted at its axis, and is fixed to the axis portion of the fan 6. In this embodiment, the substrate member 20 is a metal casting, such as an aluminum alloy.

[0022] The holding mechanism 30 engages with a locking groove 5b provided on the rotation shaft 5a of the motor 5, thereby holding the substrate member 20 on the rotation shaft 5a so that it cannot move axially relative to the rotation shaft 5a. In this embodiment, as shown in Figure 5, the holding mechanism 30 has a first lever member 31 and a second lever member 32, which are arranged on the surface of the substrate member 20 facing away from the motor 5.

[0023] The first lever member 31 is formed in an arm shape from a plate material with a thickness slightly thinner than the width of the locking groove 5b, and one end of it is an engaging portion 31a that engages with the locking groove 5b. The other end of the first lever member 31 is bent vertically (see Figure 4) to form a rectangular operating portion 31b. The first lever member 31 is bent in a V-shape between the engaging portion 31a and the operating portion 31b, and is rotatably supported on the base plate member 20 by the first support shaft 33 in the portion between the V-shaped engaging portion 31a and the operating portion 31b.

[0024] Similarly, the second lever member 32 is formed in an arm shape from a plate material with a thickness slightly thinner than the width of the locking groove 5b, and one end of it is an engaging portion 32a that engages with the locking groove 5b. The other end of the second lever member 32 is bent vertically (see Figure 4) to form a rectangular operating portion 32b. The second lever member 32 is bent in a V-shape between the engaging portion 32a and the operating portion 32b, and in the portion between the V-shaped engaging portion 32a and the operating portion 32b, it is rotatably supported on the base member 20 by a second support shaft 34 which is arranged point-symmetrically with respect to the first support shaft 33 with respect to the insertion hole 21 or rotation shaft 5a.

[0025] Thus, in this embodiment, the first lever member 31 and the second lever member 32 have the same shape and are arranged point-symmetrically with respect to the insertion hole 21 or the rotation axis 5a.

[0026] As shown in Figure 6, in this embodiment, the surface of the substrate member 20 facing away from the motor 5 is integrally provided with a cylindrical wall 22 connected to the insertion hole 21, a pair of straight walls 23 extending radially from the cylindrical wall 22 in opposite directions, and arcuate walls 24 extending circumferentially from the outer ends of each of the straight walls 23.

[0027] The first lever member 31 has an engaging portion 31a positioned on the upper surface of one straight wall 23 and an operating portion 31b positioned radially outward of the other arcuate wall 24, and is designed to rotate along the upper surface of the arcuate wall 24. Furthermore, when the operating portion 31b of the first lever member 31 is pushed radially inward, the inner portion of the operating portion 31b contacts a projection 23a provided on the upper surface of one straight wall 23, thereby restricting the stroke end in the pushing direction. In addition, the first lever member 31 has an engaging portion 31a that contacts a projection 22a provided on the cylindrical wall 22, thereby restricting the stroke end in the direction in which the pushing is released.

[0028] Similarly, the second lever member 32 has an engaging portion 32a positioned on the upper surface of the other straight wall 23, and an operating portion 32b positioned radially outward of one arcuate wall 24, and is designed to rotate along the upper surface of the arcuate wall 24. Furthermore, when the operating portion 32b of the second lever member 32 is pushed radially inward, the inner portion of the operating portion 32b abuts against a projection 23a provided on the upper surface of the other straight wall 23, thereby restricting the stroke end in the pushing direction. In addition, the second lever member 32 has an engaging portion 32a abutting against a projection 22a provided on the cylindrical wall 22, thereby restricting the stroke end in the direction in which the pushing is released.

[0029] A first torsion spring 36 is provided between the first lever member 31 and the cylindrical wall 22, held by a first retaining cylinder 35 that holds the first support shaft 33. The first lever member 31 is biased by the elastic force of the first torsion spring 36 so that the engaging portion 31a engages with the locking groove 5b. Note that other spring members may be used instead of the first torsion spring 36.

[0030] Similarly, a second torsion spring 38 is provided between the second lever member 32 and the cylindrical wall 22, held by a second retaining cylinder 37 that holds the second support shaft 34. The second lever member 32 is biased by the elastic force of the second torsion spring 38 to hold the engaging portion 32a in a position where it engages with the locking groove 5b. Note that other spring members may be used instead of the second torsion spring 38.

[0031] In the holding mechanism 30 having the above configuration, the engaging portion 31a of the first lever member 31 and the engaging portion 32a of the second lever member 32 engage with the locking groove 5b of the rotating shaft 5a, thereby restricting the relative axial movement of the base plate member 20 with respect to the rotating shaft 5a, and allowing the base plate member 20, i.e., the fan 6 to which the base plate member 20 is fixed, to be held on the rotating shaft 5a of the motor 5. On the other hand, by simultaneously pushing the operating portion 31b of the first lever member 31 and the operating portion 32b of the second lever member 32 radially inward, the first lever member 31 and the second lever member 32 are rotated around the first support shaft 33 or the second support shaft 34 against the spring force of the first torsion spring 36 or the second torsion spring 38, respectively, and the engaging portions 31a and 32a are released from the locking groove 5b. In this state, the fan 6 can be removed from the rotating shaft 5a of the motor 5 by pulling the base plate member 20 off the rotating shaft 5a. Furthermore, by inserting the rotating shaft 5a into the insertion hole 21 and engaging the engaging parts 31a and 32a with the locking groove 5b, the removed fan 6 can be attached to the rotating shaft 5a of the motor 5.

[0032] Here, if the attachment / detachment device is not configured to be point-symmetric with respect to the motor's rotation axis, as described in Patent Documents 1 and 2, the weight of the attachment / detachment device or the fan will be unbalanced with respect to the rotation axis. As a result, when the motor operates and the fan rotates, a load due to the weight imbalance will be applied to the rotation axis 5a, which may cause problems such as noise due to vibration.

[0033] In contrast, in the attachment / detachment device 10 of this embodiment, the holding mechanism 30 is configured such that the first lever member 31 and the second lever member 32, which have the same shape as each other, are arranged point-symmetrically with respect to the rotation axis 5a. Therefore, the weight balance of the attachment / detachment device 10 or the fan 6 equipped with the attachment / detachment device 10 is symmetrical with respect to the rotation axis 5a. Furthermore, since the first lever member 31 and the second lever member 32 have the same shape, the first support shaft 33 and the second support shaft 34, the first torsion spring 36 and the second torsion spring 38, the pair of straight walls 23, and the pair of arcuate walls 24, which are attached to the first lever member 31 and the second lever member 32, are also arranged point-symmetrically with respect to the rotation axis 5a. Therefore, since the weight of the attachment device 10 or the fan 6 equipped with the attachment device 10 is balanced around the rotating shaft 5a, when the motor 5 operates and the fan 6 rotates, it is possible to prevent a load due to weight imbalance from being applied to the rotating shaft 5a, thereby suppressing the generation of vibrations and noise.

[0034] Furthermore, in the attachment / detachment device 10 of this embodiment, the first lever member 31 and the second lever member 32 can be made of the same shape, so the actual number of parts can be reduced compared to conventional devices. In addition, the weight of parts such as the first lever member 31 and the second lever member 32 can be reduced and processing can be made easier, so the manufacturing cost of the attachment / detachment device 10 can be reduced.

[0035] Furthermore, in this embodiment, rivets are used as the first support shafts 33 and second support shafts 34 that rotatably support the first lever member 31 and the second lever member 32 on the substrate member 20, thereby preventing the first lever member 31 and the second lever member 32 from falling off the substrate member 20 due to vibrations during the operation of the fan 6.

[0036] Furthermore, in the attachment / detachment device 10 of this embodiment, a straight wall 23 and an arcuate wall 24 are provided on the substrate member 20, and these are used to guide the rotation of the first lever member 31 and the second lever member 32. This allows the first lever member 31 and the second lever member 32 to rotate stably, thereby improving the operability of the first lever member 31 and the second lever member 32.

[0037] Furthermore, the base plate member 20 is provided with a straight wall 23 and an arcuate wall 24, which guide the rotation of the first lever member 31 and the second lever member 32. By positioning the operating parts 31b and 32b on the side of the base plate member 20 that is away from the motor 5, it is possible to make it easier for the user to operate the operating parts 31b and 32b.

[0038] Alternatively, the substrate member 20 may be configured to have only protrusions 23a and arcuate walls 24 without providing straight walls 23. When straight walls 23 are provided, the moldability and strength of the substrate member 20 can be improved.

[0039] Furthermore, since the first lever member 31 and the second lever member 32 are shaped to bend in a V-shape between the engaging portions 31a and 32a and the operating portions 31b and 32b, respectively, the trajectory of the straight wall 23 or the arcuate wall 24 can be made more compact, and the attachment / detachment device 10 can be made smaller.

[0040] Furthermore, by guiding the rotation of the first lever member 31 and the second lever member 32 with a straight wall 23 and an arc-shaped wall 24, the area of ​​the guided portion of the first lever member 31 and the second lever member 32 can be reduced, thereby reducing the possibility of dirt adhering to the first lever member 31 or the second lever member 32. As a result, the first lever member 31 and the second lever member 32 can always rotate smoothly, further improving the operability of the attachment / detachment device 10.

[0041] Furthermore, the first lever member 31 and the second lever member 32 do not need to be exactly the same shape as long as they are arranged so that the weight balance across the rotation axis 5a is uniform.

[0042] As shown in Figure 7, the attachment / detachment device 10 can also be configured such that the tip 31c of the first lever member 31 on the side where the engaging portion 31a is provided abuts against the inner side surface of the portion between the operating portion 32b of the second lever member 32 and the portion supported by the second support shaft 34, and the tip 32c of the second lever member 32 on the side where the engaging portion 32a is provided abuts against the inner side surface of the portion between the operating portion 31b of the first lever member 31 and the portion supported by the first support shaft 33. With this configuration, both the first lever member 31 and the second lever member 32 can be rotated by pushing only one of the operating portions 31b, 32b of the first lever member 31 and the second lever member 32 radially inward. This makes it easier to remove the fan 6 from the rotating shaft 5a.

[0043] As shown in Figures 3 and 4, the attachment / detachment device 10 can also be configured such that the holding mechanism 30 is covered by a cover member 39.

[0044] As shown in Figure 8, the cover member 39 has a top wall portion 39a, a peripheral wall portion 39b, and a pair of flange portions 39c. It is fixed to the substrate member 20 by rivets 50 through through holes 39d provided in the pair of flange portions 39c, and the top wall portion 39a and peripheral wall portion 39b cover most of the holding mechanism 30. The flange portions 39c are provided with a pair of positioning holes 39e that fit onto a pair of positioning protrusions 20a provided on the substrate member 20 to position the cover member 39 relative to the substrate member 20.

[0045] Furthermore, the top wall portion 39a of the cover member 39 is provided with a circular opening 39f through which the tip of the rotating shaft 5a protrudes, and a pair of drainage holes 39g symmetrically arranged on either side of the opening 39f. Each of the pair of drainage holes 39g is formed by press-forming a portion of the top wall portion 39a in a crescent shape. The cover member 39 is fixed to the substrate member 20 with rivets 50 and cannot be removed, but by providing a pair of drainage holes 39g on the top wall portion 39a of the cover member 39, the user can easily drain the water accumulated inside the cover member 39 by removing the fan 6 from the rotating shaft 5a for cleaning and then draining the water to the outside through the pair of drainage holes 39g.

[0046] The peripheral wall portion 39b of the cover member 39 is provided with a pair of rectangular notches 39h on either side of the axis. As shown in Figure 3, the operating portion 31b of the first lever member 31 protrudes to the outside of the cover member 39 from one notch 39h, and the operating portion 32b of the second lever member 32 protrudes to the outside of the cover member 39 from the other notch 39h. The circumferential width of the notches 39h is set to allow the circumferential movement of the operating portions 31b and 32b when the first lever member 31 or the second lever member 32 rotates. In addition, the pair of arcuate walls 24 of the base member 20 each have a circumferential width greater than the notches 39h and are formed in an arc shape along the notches 39h, so that most of the pair of notches 39h are closed off by the arcuate walls 24. Furthermore, even when the operating parts 31b or 32b are pushed in and the first lever member 31 or second lever member 32 rotates in the release direction, the inner portions of the operating parts 31b and 32b abut against the projection 23a provided on the upper surface of the straight wall 23, restricting the stroke end, thereby maintaining a gap between the operating parts 31b or 32b and the pair of arcuate walls 24. This prevents the outer surfaces of the pair of arcuate walls 24 from being damaged.

[0047] The fitting mechanism 40 engages with a pair of locking pins 5c provided on the rotation shaft 5a of the motor 5 to prevent the substrate member 20 from rotating relative to the rotation shaft 5a. In this embodiment, as shown in Figures 9 and 10, the fitting mechanism 40 has four fitting grooves 41 provided on the surface of the substrate member 20 facing the motor 5, and four leaf spring members 42 as elastic bodies corresponding to these four fitting grooves 41.

[0048] More specifically, on the surface of the substrate member 20 facing the motor 5, a cross-shaped base portion 43 is integrally provided with the substrate member 20, projecting toward the motor 5 with the insertion hole 21 as its center. A circular dome-shaped portion 44 is integrally and coaxially provided with the base portion 43, projecting toward the motor 5 at the top of the base portion 43. The insertion hole 21, through which the rotating shaft 5a of the motor 5 is inserted, passes through the axis of the dome-shaped portion 44. The opening of the insertion hole 21 in the dome-shaped portion 44 is provided with an enlarged diameter portion that is slightly wider than the outer diameter of the rotating shaft 5a. This makes it easier to insert the rotating shaft 5a into the insertion hole 21.

[0049] The four fitting grooves 41 are groove-shaped and provided in the dome-shaped portion 44, each opening toward the motor 5. The four fitting grooves 41 each extend radially from the insertion hole 21 and are arranged side by side with equal spacing (90-degree intervals) between them in the circumferential direction. Furthermore, the radial length (direction perpendicular to the insertion hole 21) of the four fitting grooves 41 is shorter than the length of the locking pin 5c provided on the rotating shaft 5a.

[0050] As shown in Figure 11, each fitting groove 41 has a semicircular bottom surface 41a with an inner diameter corresponding to the outer diameter of the locking pin 5c, a pair of side surfaces 41b connected to both sides of the bottom surface 41a and parallel to the axis of rotation 5a, and a pair of inclined surfaces 41c connected to the opening end of each side surface 41b. The circumferential distance between the pair of side surfaces 41b may be the same as the diameter of the locking pin 5c, or it may be slightly larger than the diameter of the locking pin 5c. The pair of inclined surfaces 41c are inclined such that the circumferential distance between them gradually widens from the side of the side surface 41b towards the opening end.

[0051] A rectangular groove 25 in the substrate member 20 has a frame portion 45 made of a metal plate with a square outer shape fitted into it. The four leaf spring members 42 are each integrally provided with the frame portion 45 and are attached to the substrate member 20 together with the frame portion 45. On the outside of the rectangular groove 25 of the substrate member 20, there are four protrusions 26 that are used to position the fan 6 when attaching it to the substrate member 20.

[0052] The base portion 43 is provided with four storage grooves 43a that are connected radially outward to the corresponding fitting grooves 41. The four leaf spring members 42 each extend diagonally upward radially inward from the corner portion of the frame portion 45 and are positioned in the corresponding storage grooves 43a. As shown in Figure 10, in its natural state, each leaf spring member 42 protrudes above the lowest end position of the corresponding fitting groove 41 and is elastically deformable downward (away from the motor 5) toward the interior of the storage grooves 43a.

[0053] When the fan 6 is attached to the rotating shaft 5a, as described above, the fan 6 is held on the rotating shaft 5a by the holding mechanism 30, and as shown in Figure 12, the locking pins 5c provided on the rotating shaft 5a fit into either of the pair of fitting grooves 41 which are symmetrically arranged on either side of the insertion hole 21. As a result, the fan 6 is held on the rotating shaft 5a and prevented from rotating on the rotating shaft 5a, and when the motor 5 is operated, it can rotate together with the rotating shaft 5a.

[0054] Here, when the fan 6 is attached to the rotating shaft 5a and the locking pins 5c are fitted into the pair of fitting grooves 41, the portions of the pair of locking pins 5c that protrude from the fitting grooves 41 into the storage grooves 43a push the corresponding pair of leaf spring members 42 downward. In other words, the pair of locking pins 5c are biased by the pair of leaf spring members 42 in a direction that causes them to disengage from the fitting grooves 41. In this embodiment, the tips of each leaf spring member 42 are bent into a V-shape, and the leaf spring members 42 make point contact with the locking pins 5c. Furthermore, the pair of locking pins 5c are biased by the pair of leaf spring members 42, causing them to move away from the bottom surface 41a of the fitting grooves 41. By bending the tips of the leaf spring members 42 downward into a V-shape, scratches during cleaning can be suppressed, and safety can be enhanced by making it less likely for fingers or other objects to get caught.

[0055] Thus, in the attachment / detachment device 10 of this embodiment, the pair of locking pins 5c provided on the rotating shaft 5a are biased (elastically pressed) by the pair of leaf spring members 42 of the fitting mechanism 40, and the fan 6 is held on the rotating shaft 5a by the holding mechanism 30. This eliminates axial rattle of the fan 6 relative to the rotating shaft 5a, thereby reducing noise when the fan 6 is rotating.

[0056] In conventional designs, the cushioning material is attached to the locking pin afterwards, which presents a problem in that it is difficult to suppress vibrations when the direction of gravity acting on the fan differs from the axial direction of the rotation axis. Furthermore, the process of attaching and detaching the cushioning material to the locking pin during cleaning is cumbersome. Additionally, there are issues with the deterioration and damage of the cushioning material over time. In contrast, with the attachment / detachment device 10 of this embodiment, the locking pin 5c is always biased by the leaf spring member 42. Therefore, regardless of whether the range hood 1 is oriented horizontally, downwards, or diagonally (even when the direction of gravity acting on the fan 6 differs from the axial direction of the rotation axis 5a), axial rattle of the fan 6 relative to the rotation axis 5a is eliminated, reducing noise during fan rotation. Moreover, there is no need to attach or detach the cushioning material. Furthermore, in the attachment / detachment device 10 of this embodiment, a leaf spring member 42 is used as the elastic body, which suppresses deterioration and damage of the elastic body over time, and allows the vibration suppression and noise reduction effects described above to be maintained for a long period of time.

[0057] Furthermore, in the attachment / detachment device 10 of this embodiment, when the fan 6 is attached to the rotating shaft 5a and the locking pins 5c are fitted into the pair of fitting grooves 41, the pair of locking pins 5c are biased by the pair of leaf spring members 42, causing them to move away from the bottom surface 41a of the corresponding fitting groove 41 and be positioned between the pair of side surfaces 41b. Therefore, when the motor 5 operates and the rotating shaft 5a rotates, the pair of locking pins 5c push the pair of side surfaces 41b in the rotational direction, causing the fan 6 to rotate. This prevents axial load from being applied to the rotating fan 6 from the locking pins 5c, thereby preventing the fan 6 from lifting up.

[0058] Furthermore, since inclined surfaces 41c are provided at the opening end of each fitting groove 41, even if the circumferential position of the locking pin 5c and the fitting groove 41 is misaligned when attaching the fan 6 to the rotating shaft 5a, the locking pin 5c is guided between the pair of side surfaces 41b of the fitting groove 41 by the inclined surfaces 41c, thereby making it easier to attach the fan 6 to the rotating shaft 5a.

[0059] Furthermore, since four fitting grooves 41 are provided for each pair of locking pins 5c, the pair of locking pins 5c can be fitted into any pair of the four fitting grooves 41, making it easier to attach the fan 6 to the rotating shaft 5a. Note that the fitting grooves 41 are not limited to four; they may be two, or six or more, in multiples of two.

[0060] In this embodiment, when the fan 6 is attached to the rotating shaft 5a and the locking pins 5c are fitted into the pair of fitting grooves 41, a leaf spring member 42 is used as an elastic body that biases the locking pins 5c in a direction that disengages them from the fitting grooves 41. However, the embodiment is not limited to this, and other metal spring members such as diaphragm springs, disc springs, and spider springs may be used as the elastic body, or elastomers, firm sponges, air cushions, synthetic rubber, etc. may be used instead of metal spring members. More specifically, as the elastic body, for example, as shown in Figure 13, four coil springs 61 may be used, each positioned radially outside the corresponding fitting groove 41; as shown in Figure 14, one coil spring 62 may be used, coaxial with the insertion hole 21 and positioned radially inside the fitting groove 41; as shown in Figure 15, one coil spring 63 may be used, coaxial with the insertion hole 21 and positioned radially outside the fitting groove 41; or as shown in Figure 16, a torsion spring 64 may be used, each positioned radially outside the corresponding fitting groove 41.

[0061] For the first torsion spring 36 and second torsion spring 38 that apply spring force to the first lever member 31 and second lever member 32, it is preferable to use springs with a weaker spring constant so that the user can easily attach and detach them. In the attachment / detachment device 10 of this embodiment, the leaf spring member 42 of the fitting mechanism 40 elastically presses the locking pin 5c to suppress vibration, so even if the spring force of the first torsion spring 36 and second torsion spring 38 is weakened, the fan 6 can be securely held on the rotating shaft 5a.

[0062] In this embodiment, the first torsion spring 36 and the second torsion spring 38 are used, having a wire diameter of 1.2 mm, 8.25 turns, an inner diameter of 12.6 mm, an arm length of 19.8 mm, and a winding angle of 90°. The deflection angle when closed is 122°, the deflection angle when open is 136°, the initial load when the force is applied is 5.44 N, and the maximum load when the force is applied is 6.07 N. By using the first torsion spring 36 and second torsion spring 38 with such weak spring force, for example, a torsion spring in Comparative Example 1 has a wire diameter of 1.4 mm, 12.25 turns, an inner diameter of 12.6 mm, an arm length of 19.8 mm, a winding angle of 90°, a deflection angle of 122° when closed, a deflection angle of 136° when open, a load at the start of force application of 6.74 N, and a load at the end of force application of 7.51 N, or a wire diameter of 1.6 mm, 9.25 turns, and an inner diameter of 1 Compared to the case using the torsion spring of Comparative Example 2, which has a diameter of 2.6 mm, an arm length of 19.8 mm, a winding angle of 90°, a deflection angle of 122° when closed, a deflection angle of 136° when open, a load of 14.91 N at the start of force application, and a load of 16.62 N at the end of force application, it is possible to securely hold the fan 6 on the rotating shaft 5a while reducing the operating force required to operate the first lever member 31 and the second lever member 32, thereby making attachment and detachment operations easier.

[0063] In the attachment / detachment device 10 of this embodiment, the leaf spring member 42 that biases the locking pin 5c has a plate thickness of 1.2 mm, an initial angle of 30°, a deflection of 0.62 mm at the load point during use, and is configured to apply a load of 168.6 N, with a load of 337.1 N for both springs and a load-to-fan ratio of 38.2, in order to achieve a thinner design while providing sufficient vibration and noise reduction effects. By using such a leaf spring member 42, for example, compared to the leaf spring member of Comparative Example 1, which has a plate thickness of 1.0 mm, an initial angle of 30°, a deflection of 0.62 mm at the load point during use, an applied load of 99.6 N, a load of 199.1 N for both springs, and a fan load ratio of 22.6, or the leaf spring member of Comparative Example 2, which has a plate thickness of 0.8 mm, an initial angle of 30°, a deflection of 0.62 mm at the load point during use, an applied load of 49.3 N, a load of 98.5 N for both springs, and a fan load ratio of 11.2, it is possible to achieve sufficient vibration reduction and noise reduction effects while making the leaf spring member 42 thinner.

[0064] The fan device 4 of this embodiment is made of materials and has a structure that is resistant to water, hot water, detergents, etc., and can be easily cleaned. Furthermore, its exterior has few irregularities, making it easy to wash. It can also be formed from a specific non-combustible metal material.

[0065] Furthermore, the fan device 4 of this embodiment has a cover member 39 that is symmetrical and has a shape that is easy to grip, making it easy to attach and detach.

[0066] Furthermore, in this embodiment, the fan device 4 is easy to attach and detach because the operating parts 31b and 32b of the first lever member 31 and the second lever member 32 are each about 1 to 2 cm wide, corresponding to the tip of a finger.

[0067] Furthermore, in this embodiment, when the fan device 4 is attached to the rotating shaft 5a, a "click" sound is generated when the engaging portions 31a and 32a of the first lever member 31 and the second lever member 32 engage with the locking groove 5b of the rotating shaft 5a, so the user can recognize that the attachment is complete by this sound. Alternatively, the rotating shaft 5a can protrude from the opening 39f of the cover member 39, allowing the user to recognize that the attachment is complete. Alternatively, the operating portions 31b and 32b of the first lever member 31 and the second lever member 32 can be colored, and the user can recognize that the attachment is complete by the exposure and concealment of the colored portions through the notches 39h.

[0068] Furthermore, the fan device 4 of this embodiment can reliably fix the fan 6 to the rotating shaft 5a and prevent it from falling off the rotating shaft 5a, even if oil adheres to it, thanks to the holding mechanism 30 and the fitting mechanism 40.

[0069] The present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible without departing from the spirit of the invention.

[0070] For example, in the above embodiment, the holding mechanism 30 is configured to have two lever members (first lever member 31, second lever member 32), but it is not limited to this configuration, and it is also possible to have a configuration in which three or more lever members are arranged point-symmetrically around the rotation axis 5a.

[0071] In this embodiment, the fan attachment / detachment device 10 is used in the fan device 4 of the range hood 1, but it is not limited to this, and the fan attachment / detachment device 10 of the present invention may also be used in fan devices other than the range hood 1. [Explanation of Symbols]

[0072] 1. Range Hood 2. Hood section 3. Duct section 4 Fan device 5 Motors 5a Rotation axis 5b Locking groove 5c Locking pin 6 Fans 10. Fan attachment / detachment device 20 Substrate components 20a Positioning projection 21 Through hole 22 Cylindrical wall 22a protrusion 23 Straight wall 23a protrusion 24. Circular wall 25 rectangular groove 26 Convex part 30 Retention mechanism 31 First lever member 31a Engagement part 31b Operation section 31c Tip 32 Second lever member 32a Engagement part 32b Operation section 32c tip 33 1st support shaft 34 2nd support shaft 35 1st holding cylinder 36. First torsion spring 37 Second holding cylinder 38. Second torsion spring 39 Cover component 39a Ceiling wall section 39b Peripheral wall part 39c Flange section 39d through hole 39e Positioning hole 39f opening 39g drainage holes 39h Notch 40. Fitting mechanism 41 Fitting groove 41a Bottom 41b Side 41c slope 42. Leaf spring component (elastic body) 43 Base 43a Storage groove 44 Dome-shaped section 45 Frame section 50 rivets 61. Coil spring (elastic body) 62. Coil spring (elastic body) 63. Coil spring (elastic body) 64 Torsion spring (elastic body)

Claims

1. A device for attaching and detaching a fan to the rotating shaft of a motor, used in a fan system, A substrate member fixed to the fan has an insertion hole through which the rotating shaft is inserted, A holding mechanism is provided on the surface of the substrate member facing away from the motor, and engages with the locking groove of the rotating shaft to hold the substrate member on the rotating shaft, The substrate member has a fitting mechanism provided on the side of the substrate member facing the motor, which fits onto a locking pin provided on the rotating shaft to prevent the substrate member from rotating relative to the rotating shaft. The aforementioned fitting mechanism, The fitting groove into which the aforementioned locking pin fits, A fan attachment / detachment device characterized by having an elastic body mounted on the substrate member and biasing the locking pin in a direction that disengages it from the fitting groove.

2. The holding mechanism, The first lever member comprises an engaging portion that engages with the locking groove and an operating portion, and is rotatably supported on the substrate member by a first support shaft between the engaging portion and the operating portion, A fan attachment / detachment device according to claim 1, comprising an engaging portion and an operating portion that engage with the locking groove, and a second lever member rotatably supported on the substrate member by a second support shaft which is arranged point-symmetrically with respect to the first support shaft with respect to the rotation axis between the engaging portion and the operating portion.

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