blower

Abstract

To provide a ventilator having a retention mechanism that suppresses the number of components by integrally molding other components, and reduces machining of metal components compared to existing products.SOLUTION: A ventilator 1 of the present invention comprises a blower fan 2, a casing 4 that houses the blower fan 2, and a stator 20 attached to the casing 4. The blower fan 2 has a shaft attachment part 11 to which a shaft 10 is attached. In the shaft attachment part 11, a retention piece 13 is formed. The stator 20 has a housing part 26 in which a shaft attachment part insertion hole 28 and a retention piece insertion hole 29 into which the shaft attachment part 11 and the retention piece 13 respectively are inserted are formed. The housing part 26 is provided with a top plate part 27, a vertical wall part 35, and a horizontal wall part 36 to which the retention piece 13 can be locked.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a blower device having a retaining mechanism that prevents a blower fan from coming off the device body. [Background technology]

[0002] A centrifugal blower fan described in Patent Document 1 is known as a conventional blower fan. The centrifugal blower fan (11) of Patent Document 1 includes a scroll-shaped casing (12) made up of a body (12a) and a lid (12b), and the casing (12) is formed with an air inlet (13) and an air outlet (14). The casing (12) also contains a motor (15), an impeller (16), and other components.

[0003] A cylindrical bearing housing 17 is provided in the main body 12a of the casing 12. The outer rings of two bearings 18 are supported inside the bearing housing 17, and the rotating shaft 19 of the motor 15 is supported on the inner rings of the bearings 18. A ring 20 is attached to the lower end of the rotating shaft 19 to prevent the rotating shaft 19 from coming off and to position it in the axial direction.

[0004] 6 to 8 show a blower that has already been manufactured by the applicant of the present application. In this blower 101, a groove 150 is formed in shaft 110 as a mechanism for preventing centrifugal fan 102 from coming off, and a retaining ring 152 is provided to engage with this groove 151. In addition, a cap 153 is provided on the upper side of bearing 122.

[0005] In many cases, inexpensive products are required for such blowers, and in such cases, it is necessary to keep the manufacturing costs low. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-245658 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the centrifugal blower fan of Patent Document 1 requires a ring (20) to prevent the rotating shaft (19) from coming off and to position it in the axial direction, which increases the number of parts. Also, the existing product of the applicant of the present application shown in Figures 6 to 8 requires machining to form a groove 151 in the metal shaft 110, and uses parts such as a retaining ring 152 and a cap 153, leaving room for improvement in the number of parts.

[0008] Therefore, the present invention aims to solve the above problems, reduce the number of parts by molding them integrally with other parts, and provide a blower device with a locking mechanism that reduces the amount of processing of metal parts compared to existing products. [Means for solving the problem]

[0009] The air blower device of the present invention includes a blower fan, a casing that houses the blower fan, and a stator that is attached to the casing. The blower fan has a shaft attachment portion for attaching a shaft, and the shaft attachment portion is formed in a substantially cylindrical shape with a bottom, and is attached to the tip of the shaft attachment part The retaining piece multiple The stator is formed by the shaft mounting Department Insert Shaft mounting part Insertion hole and a retaining piece insertion hole into which the retaining piece is inserted. and a storage portion formed with The number of the retaining piece insertion holes is the same as the number of the retaining pieces, A locking portion capable of locking the retaining piece is formed in the accommodation portion. The locking portion has a side wall portion to which the removal prevention piece is locked when the removal prevention piece is inserted into the removal prevention piece insertion hole, and the removal prevention piece is moved to a position where it does not interfere with the side wall portion, and is further pushed in until the removal prevention piece is positioned deeper than the side wall portion. It is characterized by the fact that [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a blower having a retaining mechanism that is less expensive than conventional products (existing products). [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a vertical cross-sectional view of a blower according to an embodiment of the present invention. [Figure 2] 1 is a perspective view of a blower fan according to an embodiment of the present invention; [Figure 3] FIG. 1 is a plan view of a blower fan according to an embodiment of the present invention. [Figure 4] 1 is a partial perspective view of a blower device according to an embodiment of the present invention, with the blower fan and windings removed; [Figure 5] 1 is a perspective view showing a retaining structure for a blower according to an embodiment of the present invention; [Figure 6] FIG. 10 is a vertical cross-sectional view of a conventional blower. [Figure 7] FIG. 1 is a perspective view of a conventional blower fan. [Figure 8] FIG. 1 is a plan view of a conventional blower fan. DETAILED DESCRIPTION OF THE INVENTION

[0012] Preferred embodiments of the blower of the present invention will be described below with reference to the accompanying drawings. The embodiments described below do not limit the scope of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential requirements of the present invention.

[0013] As shown in FIG. 1, the blower device 1 of this embodiment is configured to include a centrifugal fan 2, a motor 3 as a driving source that provides rotational force to the centrifugal fan 2, and a casing 4 that is the outer shell of the blower device 1 and houses the centrifugal fan 2 and the motor 3.

[0014] As shown in FIGS. 1 to 3, the centrifugal fan 2 includes a cylindrical fan cup 5 with a bottom, a yoke 6 disposed inside a side surface 5A of the fan cup 5, a permanent magnet 7 disposed on the inner surface of the yoke 6, a plurality of blades 8 disposed generally radially from the outer surface of the side surface 5A of the fan cup 5, and an annular plate 9 connected to all of the blades 8. A generally cylindrical shaft mounting portion 11 with a bottom is formed in the center of the inside of the bottom surface 5B of the fan cup 5 to which a shaft 10, which serves as a rotating shaft, is attached. Three rectangular plate-like retaining pieces 13 are formed at a tip 12 of the shaft mounting portion 11 and extend outward. The three retaining pieces 13 are equally spaced (120° apart). The retaining pieces 13 extend in a direction perpendicular to the shaft 10. The fan cup 5, blades 8, annular plate 9, shaft mounting portion 11, and retaining pieces 13 are integrally molded from a resin material. The number of retaining pieces 13 can be increased or decreased.

[0015] A cylindrical sleeve 15 with a bottom is formed on a base 14 that constitutes the casing 4. The motor 3 is configured to include a permanent magnet 7 provided in a fan cup 5 of the centrifugal fan 2, a laminated core 16 provided on the outer periphery of the sleeve 15, an upper cover 17 that covers the upper side of the laminated core 16, a lower cover 18 that covers the lower side of the laminated core 16, a stator 20 having a winding 19 wound around the laminated core 16 from the outside of the upper cover 17 and the lower cover 18, and a printed circuit board 21 mounted with various electronic components electrically connected to both ends of the winding 19. The centrifugal fan 2 equipped with the permanent magnet 7 rotates around the shaft 10 by receiving a magnetic force from the stator 20.

[0016] A cylindrical bearing 22 is housed within the sleeve 15, and the shaft 10 is inserted into this bearing 22. A tip end 23 of the shaft 10 abuts against a bottom 24 of the sleeve 15, and a base end 25 of the shaft 10 is fixed to the shaft mounting part 11.

[0017] As shown in Fig. 4, upper cover 17 has a housing portion 26 formed in a substantially cylindrical shape. A circular shaft mounting portion insertion hole 28 into which shaft mounting portion 11 is inserted is formed in a top plate portion 27 of housing portion 26. In addition, three substantially rectangular prevention piece insertion holes 29 are formed in communication with shaft mounting portion insertion hole 28 and into which prevention pieces 13 are inserted. Prevention piece insertion holes 29 are formed at equal intervals (120° intervals) like prevention pieces 13.

[0018] The top plate portion 27 has a first edge portion 30 that forms the retaining piece insertion hole 29, a second edge portion 31 that faces the first edge portion 30, and a third edge portion 32 that connects the first edge portion 30 and the second edge portion 31. An upper corner portion 33 of the first edge portion 30 and an upper corner portion 34 of the second edge portion 31 have a curved shape.

[0019] The second edge 31 is formed with a vertical wall 35 and a horizontal wall 36 that extend inward of the storage section 26. The horizontal wall 36 extends from the lower end of the vertical wall 35 in a direction perpendicular to the vertical wall 35. An upper corner 37 of the horizontal wall 36 has a curved shape. In this embodiment, the top plate 27, vertical wall 35, and horizontal wall 36 of the storage section 26, with which the anti-detachment piece 13 may be locked, are locking portions, and the vertical wall 35 and horizontal wall 36 are locking pieces.

[0020] The casing 4 has intake ports 38, 39 as intake sections formed on both sides in the axial direction of the shaft 10, which is also the suction direction of the centrifugal fan 2. In this embodiment, the base 14 and cover 40 constituting the casing 4 are each provided with the intake ports 38, 39, but it is also possible to provide the intake port 38 on only one side, for example. Note that one or more exhaust ports (not shown) are formed in the discharge direction of the centrifugal fan 2, perpendicular to the intake ports 38, 39.

[0021] As shown in FIG. 5 , when attaching the centrifugal fan 2 to the casing 4, the shaft attachment portion 11 is inserted into the shaft attachment portion insertion hole 28, and the three retaining pieces 13 are inserted into the three retaining piece insertion holes 29. At this time, the shaft 10 is inserted into the bearing 22. Then, with the retaining pieces 13 close to the side wall portion 36, the centrifugal fan 2 is rotated to move the retaining pieces 13 below the first edge portion 30. The retaining pieces 13 are moved to a position where they do not interfere with the side wall portion 36, and the centrifugal fan 2 is further pushed in to move the retaining pieces 13 to a position between the sleeve 15 and the side wall portion 36, i.e., a position behind the side wall portion 36. This ensures that the retaining pieces 13 engage with the side wall portion 36 even when the centrifugal fan 2 is lifted, preventing the centrifugal fan 2 from coming off the casing 4.

[0022] As described above, the blower device 1 of this embodiment includes the blower fan 2, the casing 4 that houses the blower fan 2, and the stator 20 attached to the casing 4. The blower fan 2 has a shaft mounting portion 11 for mounting the shaft 10, and the shaft mounting portion 11 is formed with a retaining piece 13. The stator 20 has a housing portion 26 with a shaft mounting portion insertion hole 28 and a retaining piece insertion hole 29 for inserting the shaft mounting portion 11 and the retaining piece 13. The housing portion 26 is formed with a top plate portion 27, vertical wall portions 35, and horizontal wall portions 36 in which the retaining piece 13 can be engaged. Therefore, a retaining mechanism can be formed by the retaining piece 13 and the housing portion 26 (top plate portion 27, shaft mounting portion insertion hole 28, retaining piece insertion hole 29, vertical wall portions 35, and horizontal wall portions 36) made of resin. Furthermore, no processing is required for the shaft 10, which is a metal component, to form the retaining mechanism, thereby reducing manufacturing costs.

[0023] Furthermore, in the blower 1 of this embodiment, the shaft mounting portion 11 is formed in a substantially cylindrical shape with a bottom, and multiple retaining pieces 13 are formed at the tip 12 of the shaft mounting portion 11, so there is no need to form a retaining mechanism on the shaft 10, which is a metal part, and the retaining pieces 13 can be molded integrally with the shaft mounting portion 11 and, by extension, the fan cup 5 of the blower fan 2. Furthermore, since multiple retaining pieces 13 are formed, the retaining pieces can be stably engaged with the engaging portion.

[0024] In addition, the blower 1 of this embodiment has Locking part However, the upper cover 17 has a vertical wall portion 35 and a horizontal wall portion 36 that extend from the second edge portion 31 of the anti-removal piece insertion hole 29 toward the inside of the accommodation portion 26. Therefore, the vertical wall portion 35 and the horizontal wall portion 36 can restrict the direction in which the anti-removal piece 13 is inserted into or removed from the anti-removal piece insertion hole 29. In addition, the vertical wall portion 35 and the horizontal wall portion 36 can be formed integrally with the upper cover 17, thereby reducing the number of parts.

[0025] Furthermore, in the blower device 1 of this embodiment, when the blower fan 2 is attached to the casing 4, the anti-detachment piece 13 is positioned further back than the vertical wall portion 35 and the horizontal wall portion 36, so that even if force is applied to the blower fan 2 in the direction of pulling it out, the anti-detachment piece 13 engages with the vertical wall portion 35 and the horizontal wall portion 36, preventing the blower fan 2 from unintentionally coming off the casing 4.

[0026] Furthermore, in the blower device 1 of this embodiment, the shaft mounting portion 11 is molded integrally with the fan cup 5 of the blower fan 2 using a resin material, which reduces the number of parts because the shaft mounting portion 11 is not a separate part from the fan cup 5. Furthermore, there is no need to create separate molds for molding the fan cup 5 and the shaft mounting portion 11, which reduces manufacturing costs.

[0027] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the present invention. For example, the type of blower device is not important as long as a similar blower fan retention mechanism can be adopted. [Explanation of symbols]

[0028] 1. Blower 2. Blower fan 4 Casing 5. Fun Cup 10 shaft 11 Shaft mounting part 12 Tip 13 Retaining piece 20 Stator 26 Storage section 27 Top plate Department 28 Insert the shaft mounting part hole 29 Inserting the retaining piece hole 31 Second edge (edge) 35 Vertical wall (locking) Department) 36 Side wall (locking Department)

Claims

1. A blower fan and a casing that houses the blower fan; a stator attached to the casing, The blower fan has a shaft mounting portion for mounting a shaft, The shaft attachment portion is formed in a substantially cylindrical shape with a bottom, and a plurality of retaining pieces are formed at a tip end of the shaft attachment portion, the stator has an accommodating portion in which a shaft mounting portion insertion hole into which the shaft mounting portion is inserted and a retaining piece insertion hole into which the retaining piece is inserted are formed, The number of the retaining piece insertion holes is the same as the number of the retaining pieces, A locking portion is formed in the accommodation portion so that the retaining piece can be locked therein, the locking portion has a side wall portion that locks the removal prevention piece when the removal prevention piece is inserted into the removal prevention piece insertion hole, The air blower is characterized in that the retaining piece is moved to a position where it does not interfere with the side wall portion, and is further pushed in so that the retaining piece is positioned deeper than the side wall portion.

2. The air blower according to claim 1, wherein the housing portion has a top plate portion, and a space is defined below the top plate portion in which the retaining piece can move.

3. 3. The air blower according to claim 1, wherein the locking portion has a vertical wall portion extending from an edge of the retaining piece insertion hole toward the inside of the accommodating portion.

4. The air blower device according to claim 3, wherein the horizontal wall portion extends from a lower end of the vertical wall portion in a direction perpendicular to the vertical wall portion.

5. 5. The blower device according to claim 1, wherein the shaft mounting portion is made of a resin material and is integral with a fan cup of the blower fan.

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