JP2008297917A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blower wherein water is prevented from accumulating in a recess provided with a heat sink in a blower case. <P>SOLUTION: In the blower 11 provided with a fan 15 mounted on the output shaft of a motor, and a blower case 30 covering the fan 15. In a bottom wall 33 of the blower case 30, the outside of the outer diameter of the fan 15 is axially expanded from the part inside the outer diameter of the fan 15 in an axial direction of the fan 15 to form an expansion part 51. In the inside of the outer diameter of the fan 15 of the bottom wall 33, a recess 45 is formed in the circumferential direction. A heat sink 47 is provided in exposed state in the recess 45. A first drainage groove 53 and a second drainage groove 55 are made in the area from the recess 45 to the expansion part 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a blower in which a motor and a fan are integrally provided and a heat sink is exposed at the bottom of a blower case.

  Conventionally, such a blower as shown in FIG. 7 is known. In the blower 1, a sirocco fan 3 is mounted on an output shaft of a motor 2, and air is sucked from above and discharged to the outer peripheral side. A blower case 4 for guiding the air discharged from the fan 3 to the outlet is provided on the outer periphery of the fan 3, and an outer peripheral wall 4a formed on the outer peripheral side of the fan and a bottom formed on the lower side of the fan. And a wall 4b.

  A circuit element 6 is mounted on the printed circuit board 5 disposed below the blower case 4, and a heat sink 7 is fixed to the circuit element 6. The fins 7 a of the heat sink 7 are exposed and mounted in the blower case 4.

  In such a blower 1, when the discharge capacity is large, the amount of heat generated by the element also increases, and it is necessary to increase the fins of the heat sink. For this reason, the bottom wall of the blower case 4 is recessed into a concave shape, and a heat sink having large fins is attached to the concave portion.

  However, in such a blower, water such as rain and snow that has entered from the suction port 4 b of the blower case 4 accumulates in the recess of the blower case 4. For this reason, there is a possibility that the water enters the inside of the gap of the heat sink and the substrate or the like is short-circuited. In addition, since water accumulates, mold, odor, and the like may occur.

  In addition, what is shown to patent document 1 is known as an air blower.

JP 2002-335647 A

  This invention makes it the subject to solve the said problem, and provides the air blower which can prevent that water accumulates in the recessed part in which the heat sink of the blower case was provided.

  In order to solve the above problems, a motor (13), a cylindrical fan (15) mounted on the output shaft of the motor, and a blower case (30) covering the outer peripheral side and the bottom side of the fan (15) Of the bottom wall (33) of the blower case (30), the portion outside the outer diameter of the fan (15) is larger in the axial direction than the portion inside the outer diameter of the fan (15) in the axial direction. A concave portion (45, 73) is formed in the circumferential direction in a portion of the bottom wall (33) inside the outer diameter of the fan (15), and the concave portion (45, 73). In the blower in which the heat sink (47, 75) is exposed on the bottom of the drainage groove (53, 55, 77, 79, 81) from the recess (45, 73) to the enlarged portion (51). It is possible to adopt means that forms

  According to this means, water can be quickly discharged from the recess (45, 73) to the enlarged portion (51) through the drainage grooves (53, 55, 77, 79, 81). Therefore, it is possible to prevent water from entering through the gap between the heat sinks and short-circuiting the substrate and the like, and to prevent generation of mold, odor, and the like.

  In order to solve the above-mentioned problems, the concave portions (45, 73) and the heat sinks (47, 75) in the concave portions (45, 73) can adopt means formed in an arc shape or an annular shape. Therefore, the size of the heat sink (47, 75) can be changed according to the discharge capacity, and various demands can be met.

  In order to solve the above problems, the motor (13) can employ means arranged such that its axis is in the vertical direction or horizontal direction. Therefore, the applicable range of the apparatus can be expanded.

  In order to solve the above-mentioned problem, the blower case (30) can be integrated, or can be constituted by a motor flange (63) and a scroll casing (65). Therefore, the degree of freedom in design can be improved.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In FIG.1 and FIG.2, the code | symbol 11 shows an air blower. The blower 11 is a centrifugal blower that blows out air sucked from the rotation axis direction outward in the radial direction, and includes a motor 13 as a drive source. A fan 15 that is a centrifugal multiblade fan is provided on the output shaft 13 a of the motor 13. The fan 15 has a boss portion 17 that bulges upward in a substantially dome shape and has an output shaft 13a fixed at the center. On the outer periphery of the boss portion 17, a large number of blades 19 are arranged in parallel with the axis at equal intervals in the circumferential direction. These blades 19 are curved in the circumferential direction as they go outward in the radial direction, and their upper ends are connected by an annular shroud 21. The inner side of the annular shroud 21 serves as a fan suction port 23, and the space between the outer peripheral ends of a large number of blades 19 serves as a fan discharge port 25.

  A resin scroll casing 27 having a substantially U-shaped cross section is provided on the outer periphery of the fan 15. The scroll casing 27 extends from a position slightly spaced from the upper end edge of the shroud 21 in an annular shape extending radially outward, and extends downward from the outer peripheral edge of the upper wall portion 29. A side wall 31 covering the radially outer side of the fan 15 and extending radially inward from the lower edge of the side wall 31 to the inner peripheral side of the blade 19 in parallel and close to the lower edge of the fan 15. The bottom wall portion 33 and the motor storage portion 34 to which the bottom wall portion 33 is connected are provided. The inner side of the annular upper wall portion 29 is a suction port 35. Further, the bottom wall portion 33 is configured by an inner peripheral side bottom wall portion 43 inside the outer peripheral side lower end edge of the fan 15 and an outer peripheral side bottom wall portion 49 outside the outer peripheral side lower end edge of the fan 15. And the outer peripheral side bottom wall part 49 forms the spiral channel | path 39 mentioned later with the side wall part 31 and the upper wall part 29. FIG. In the scroll casing 27, the upper wall portion 29, the side wall portion 31, and the bottom wall portion 33 constitute a blower case 30.

  As shown in FIG. 1, the scroll casing 27 has a spiral shape in plan view, and the side wall portion 31 of the scroll casing 27 is closest to the outer periphery of the fan 15, and the scroll nose portion 37 It is formed so that the distance from the outer periphery of the fan 15 increases as it rotates clockwise in one. A spiral passage 39 surrounded by the upper wall portion 29, the side wall portion 31, the outer peripheral side bottom wall portion 49 and the outer periphery of the fan 15 is formed, and the fluid passage cross-sectional area of the spiral passage 39 is changed from the scroll nose portion 37 to the timepiece. As it rotates around, it expands. The scroll casing 27 is formed with a discharge port 41 directed in a tangential direction when the outer periphery of the fan 15 is rotated once from the scroll nose portion 37, from which the air passing through the spiral passage is discharged. ing.

  In such a configuration, when the fan 15 is rotated by the motor 13, the outside air is sucked into the fan 15 from the suction port 35 of the scroll casing 27 through the fan suction port 23, and rotated outside the blade 19 while being rotated by the blade 19. It is discharged into the spiral passage 39. Then, the air discharged to the spiral passage 39 rotates clockwise in FIG. 1 and is discharged from the discharge port 41.

  In such a scroll casing 27, the inner peripheral side bottom wall portion 43 located on the vertical lower side of the blade 19 of the fan 15, that is, on the opposite side of the fan 15 from the suction port 23 in the rotational axis direction of the fan 15. A concave portion 45 having a circular arc shape in plan view extending in the rotation direction of the fan from a position slightly advanced in the rotation direction of the fan 15 from the scroll nose portion 37 is formed. The recess 45 has an inner peripheral wall 45a and an outer peripheral wall 45b on the inner peripheral side and the outer peripheral side, respectively, and a bottom wall 45c on the bottom.

  A heat sink 47 having a circular arc shape in plan view is disposed on the bottom wall 45 c of the recess 45. The heat sink 47 includes a heat sink flat plate portion 47a attached to the bottom wall 45c, and heat radiating fins 47b extending upward from the heat sink flat plate portion 47a. A circuit element (not shown) having a large amount of heat mounted on the printed board is connected and fixed to the lower portion of the heat sink 47.

  Of the bottom wall portion 33 of the scroll casing 27, the outer peripheral side wall 49 positioned outside the outer periphery of the fan 15 is axially directed to the side opposite to the inlet port 23 of the fan 15 from the inner peripheral side bottom wall 43. The enlarged portion 51 is formed. The enlarging portion 51 gradually increases in the axial direction toward the anti-suction port side in the direction of rotation of the fan 15, is formed wide, and is connected to the outlet 41.

  A first drainage groove 53 reaching the enlarged portion 51 is formed at the center in the circumferential direction of the recess 45 where the heat sink 47 is provided. In addition, a second drainage groove 55 reaching the enlarged portion 51 is also provided at the end of the concave portion 45 in the fan rotation direction (end on the downstream side of the air flow).

  In such a configuration, when the motor 33 is driven, the fan 15 rotates clockwise in FIG. Thus, the air sucked from the suction port 35 is rotated by the fan 15 and discharged from the blowout port 41 while rotating in the scroll casing 27 clockwise. The air flow in the scroll casing 27 cools the heat sink 47 in the recess 45 and cools the circuit elements connected and fixed to the heat sink 47.

  Here, water drops such as rain and snow enter from the suction port 35 together with air. These water drops move on the bottom wall portion 33 of the scroll casing 27 in the downstream direction along the air flow, and fall into the recess 45 provided with the heat sink 47. The water droplets W that have fallen into the recess 45 are discharged from the first drainage groove 53 and the second drainage groove 55 to the enlarged portion 51, pushed by the air flow, and discharged from the outlet 41.

  As described above, in the blower 11, the outer peripheral side bottom wall 49 located outside the outer periphery of the fan 15 in the bottom wall portion 33 of the scroll casing 27 is further from the inner peripheral side bottom wall 43 to the fan 15. It expands in the axial direction, and forms an enlarged portion 51. The enlarged portion 51 is gradually formed wider in the direction of rotation of the fan 15 and connected to the outlet 41, and the circumferential center of the recess 45 Since the first drainage groove 53 reaching the enlarged part 51 is formed in the part, and the second drainage groove 55 reaching the enlarged part 51 is also provided at the leeward side end part of the concave part 45, the concave part 45. Water droplets that have entered and dropped can be quickly discharged through the first drainage groove 51 and the second drainage groove 53. Therefore, water can be prevented from accumulating in the recess 45 provided with the heat sink 47, and this water can be prevented from entering a printed circuit board or the like to cause a problem such as a short circuit. Further, generation of mold and odor due to the accumulated water can be prevented.

  In the above embodiment, the blower case 30 is integrally formed by the upper wall portion 29, the side wall portion 31, and the bottom wall portion 33 of the scroll casing 27, as shown in FIG. However, the member constituting the blower case 30 is not necessarily limited to the scroll 27, and the inner bottom wall 43 is composed of the motor flange 63 as in the blower 61 shown in FIG. The side wall portion 31 and the upper wall portion 29 may be configured by the scroll casing 65, or may be configured by other combinations in consideration of productivity, assembly property, maintainability, and the like.

  FIG. 4 is a diagram showing a second embodiment of the present invention. This is a fan 61 shown in FIG. 3 arranged such that the rotation shafts of the motor 13 and the fan 15 are horizontal and the second drainage groove 55 is on the bottom. Even if it arrange | positions in this way, the water droplet W which entered the recessed part 45 can be drained efficiently, Therefore Generation | occurrence | production of the short circuit of a printed circuit board, mold | fungi, and an odor can be prevented.

  5 and 6 are diagrams showing a third embodiment of the present invention. The blower 71 is formed in an annular shape over the entire circumference, while the concave portion 45 and the heat sink 47 are provided in an arc shape in the scroll casing 27 of the first embodiment.

  That is, an annular recess 73 is formed on the inner peripheral side bottom wall 43 located on the inner side of the outer diameter of the fan 15 in the bottom wall 33 of the scroll casing 27, and the annular recess 73 includes An annular heat sink 75 is attached. A first drainage groove 77, a second drainage groove 79, and a third drainage groove 81 extending from the recess 73 to the enlarged portion 51 are spaced apart in the circumferential direction.

  As described above, in the blower 71, the annular recess 73 and the heat sink 75 are formed on the inner peripheral side bottom wall 43 of the scroll casing 27 over the entire circumference, and the first through the recess 73 to the enlarged portion 51. Since the third drain grooves 77, 79, 81 are spaced apart from each other in the circumferential direction, the water in the annular recess 73 can be discharged quickly. Therefore, it is possible to prevent occurrence of short circuit, mold and odor of the printed circuit board.

The top view which shows the air blower which is the 1st Embodiment of this invention. The longitudinal cross-sectional view which follows the AA line of the air blower shown in FIG. The longitudinal cross-sectional view which shows the state which comprised the blower case of the air blower shown in FIG. 1 with the combination of other components. The longitudinal cross-sectional view which shows the air blower which is the 2nd Embodiment of this invention. The top view which shows the air blower which is the 3rd Embodiment of this invention. The longitudinal cross-sectional view which follows the AA line of the air blower shown in FIG. The longitudinal cross-sectional view which shows the conventional air blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Blower 13 Motor 15 Fan 27 Scroll casing 30 Blower case 33 Bottom wall part 45 Recessed part 47 Heat sink 51 Enlarged part 53 1st drain groove 55 2nd drain groove 61 Blower 63 Motor flange 65 Scroll 71 Blower 73 Recessed part 75 Heat sink 77 1st 1 drainage channel 79 second drainage channel 81 third drainage channel

Claims (4)

A motor (13), a cylindrical fan (15) mounted on the output shaft of the motor, and a blower case (30) covering the outer peripheral side and the bottom side of the fan (15) are provided. The portion of the bottom wall (33) of 30) outside the outer diameter of the fan (15) expands in the axial direction relative to the fan (15) from the portion inside the outer diameter of the fan (15). A recess (45, 73) is formed in the circumferential direction in a portion of the bottom wall (33) that is inside the outer diameter of the fan (15), and the recess (45, 73) is formed. In the blower in which the heat sink (47, 75) is exposed on the bottom surface of
A blower characterized in that drainage grooves (53, 55, 77, 79, 81) extending from the recesses (45, 73) to the enlarged portion (51) are formed.   The blower according to claim 1, wherein the recess (45, 73) and the heat sink (47, 75) in the recess (45, 73) are formed in an arc shape or an annular shape.   The blower according to claim 1, wherein the motor (13) is arranged such that an axis thereof is in a vertical direction or a horizontal direction.   The blower according to claim 1, wherein the blower case (30) is integrally formed of a motor flange (63) and a scroll casing (65).

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