JP2017150327A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower that can prevent water from being immersed into a motor and can attain downsizing.SOLUTION: There are provided an upper end of a motor fixing part 32e extending from an inner surface of a casing 30 to enclose a side part of an electric motor 20 and a cover main body 34a; a cut-off wall 34c extending from an outer peripheral surface of the cover main body 34a over a peripheral direction of the cover main body 34a in a slant downward direction radially outward. The cut-off wall 34c has a height size T at an outer peripheral surface of the cover main body 34a that is gradually increased toward a portion opposing against a tongue part 30c parting a starting end part of a spiral ventilation passage 30f in the casing 30 and a discharging ventilation flue 30g.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a blower used for, for example, a vehicle air conditioner.

  Conventionally, as this type of blower, a rotary shaft is arranged in the vertical direction, and a cylindrical impeller that allows air to flow in from an axial end and flow out of an outer peripheral portion is connected to the lower side of the impeller. A motor that rotates the impeller, and a spiral air passage that is provided so as to surround the outer peripheral side of the impeller and that flows the air that has flowed out from the outer peripheral portion of the impeller in the rotation direction of the impeller, and a terminal portion of the spiral air passage And a casing formed with a discharge ventilation path extending from the discharge port toward the discharge port, and a portion located below the impeller in the casing has a motor fixing portion for fixing the motor. .

  When the blower is applied to an air conditioner for a vehicle, for example, when air outside the vehicle compartment is supplied to the vehicle interior by the blower, water such as rain water may enter the casing together with the air outside the vehicle compartment. The water that has entered the casing flows on the outer peripheral side of the motor in the casing by the air flowing through the casing.

  In the blower, since the water flowing on the outer peripheral side of the motor enters the inside of the motor, it may cause a failure of the motor. Therefore, the cylindrical portion provided to extend upward along the outer peripheral portion of the motor, and the cylindrical portion The outer peripheral surface of the cylindrical portion is extended in the circumferential direction and the extending portion extending radially outward from the outer peripheral surface of the cylindrical portion is formed, thereby preventing water flowing in the casing from entering the motor. (For example, refer to Patent Document 1).

JP2015-214939A

  However, in the blower in which the cylindrical portion and the extension portion are formed, water is prevented from entering the motor by forming a plurality of extension portions in the vertical direction on the outer peripheral surface of the cylindrical portion. In this blower, since a plurality of extending portions must be formed in the tubular portion, the height of the tubular portion is increased. For this reason, in this air blower, the space | interval of an impeller and a motor becomes large, and size reduction cannot be achieved.

  An object of the present invention is to provide a blower capable of preventing water from entering the motor and reducing the size.

  In order to achieve the above object, the present invention provides a cylindrical impeller that is arranged with its rotary shaft directed in the vertical direction and allows air to flow in from the axial end and out of the outer periphery, and the lower side of the impeller And a motor for rotating the impeller, and a spiral air passage and a spiral air passage that are provided so as to surround the outer peripheral side of the impeller and distribute the air flowing out from the outer peripheral portion of the impeller in the rotation direction of the impeller And a casing formed with a discharge ventilation path extending from the terminal end portion toward the discharge port. A portion of the casing located below the impeller has a motor fixing portion for fixing the motor, and the motor The fixing portion has a vertical wall extending upward from the inner surface of the casing and surrounding the side of the motor, and a water blocking wall extending obliquely downward radially outward from the outer peripheral surface of the vertical wall over the circumferential direction of the vertical wall. The water blocking wall is high on the outer peripheral surface of the vertical wall. Dimension gradually increases toward the portion facing the tongue that separates the start end of the spiral air passage in the casing and a discharge ventilation path.

  As a result, the height dimension of the water blocking wall at the part where the width direction dimension of the spiral air passage becomes small increases, so the flow of water to the motor side is regulated around the part where water easily enters the motor. Is done.

  Further, in order to achieve the above object, the present invention provides a cylindrical impeller that is arranged with the rotating shaft directed in the vertical direction and allows air to flow in from the axial end and flow out of the outer periphery. A motor that is connected to the lower side and rotates around the impeller, and a spiral air passage and a swirl that are provided so as to surround the outer peripheral side of the impeller and circulate in the rotation direction of the impeller. A casing formed with a discharge ventilation path extending from the terminal end portion of the ventilation path toward the discharge port, and a motor fixing portion for fixing the motor is provided in a portion of the casing located below the impeller. The motor fixing part extends upward from the inner surface of the casing and surrounds the side of the upper end of the motor, and the upper surface projects from the vertical wall to the inner peripheral side of the vertical wall and covers a part of the upper surface of the motor from above A cover portion, and the upper surface cover portion is In the circumferential direction of the vertical wall is formed in a predetermined range including a portion facing the tongue that separates the start end of the spiral air passage in the casing and a discharge ventilation path.

  As a result, the upper surface of the motor is covered in the vicinity of the portion where the width direction dimension of the spiral air passage becomes small, so that the flow of water to the motor side is regulated around the portion where water easily enters the motor. .

  According to the present invention, since the flow of water to the motor side can be regulated around the portion where water easily enters the motor in the spiral air passage, the water to the motor side can be controlled over the entire circumference of the spiral air passage. As compared with the case where a structure that restricts the intrusion of the motor is configured, the distance between the motor and the impeller can be reduced, and the size can be reduced.

It is a top view of the air blower which shows 1st Embodiment of this invention. It is a top view of the air blower which shows the state which removed the impeller and the 1st casing. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. (A) is a top view of a motor cover, (b) is a side view of a motor cover. It is BB sectional drawing of FIG. 1 which shows 2nd Embodiment of this invention. (A) is a top view of a motor cover, (b) is a side view of a motor cover.

  1 to 5 show a first embodiment of the present invention.

  As shown in FIG. 1, the blower 1 of the present invention is a centrifugal blower, and is used as, for example, a blower of a vehicle air conditioner.

  As shown in FIGS. 3 and 4, the blower 1 surrounds an impeller 10 formed in a cylindrical shape, an electric motor 20 for rotating the impeller 10, and an outer peripheral portion and an outer peripheral side of the impeller 10. And a casing 30.

  As shown in FIGS. 3 and 4, the impeller 10 is arranged such that the rotation shaft extends in the vertical direction. The impeller 10 extends in the rotational axis direction, and has a plurality of blades 11 provided at predetermined intervals in the circumferential direction, a substrate 12 provided on the lower end side, and a rim 13 provided on the upper end side. And have.

  The wing | blade 11 is arrange | positioned so that it may extend toward the outer side from radial inside. The blade 11 has a radially outer side curved toward one side in the circumferential direction with respect to the radially inner side.

  The substrate 12 is a disk-shaped member in which lower end portions of a plurality of blades 11 are connected to each other on the outer peripheral side at intervals in the circumferential direction. The upper surface side of the substrate 12 gradually protrudes upward from the outer peripheral portion toward the central portion. The lower surface side of the substrate 12 is formed in a concave shape that gradually decreases from the outer peripheral side toward the center.

  The rim 13 is a cylindrical member in which the upper end portions of the plurality of blades 11 are connected to each other at intervals in the circumferential direction. The rim 13 extends from the upper end of the blade 11 toward the outside in the axial direction, and extends obliquely toward the inside in the axial direction and the outside in the radial direction.

  When the impeller 10 rotates in the circumferential direction about the radial center as a rotation axis, air flows in from the upper end side, and between the substrate 12 and the rim 13 and from the gap between the adjacent blades 11 to the radially outer side. The air flows out radially.

  As shown in FIGS. 3 and 4, the electric motor 20 includes a cylindrical motor body 21 and a rotating shaft 22 that protrudes from one end surface in the axial direction of the motor body 21. In the electric motor 20, the motor main body 21 is fixed to the casing 30 with the tip of the rotating shaft 22 facing upward, and the impeller 10 is connected to the tip of the rotating shaft 22. In the electric motor 20, the upper side of the motor main body 21 is located in a concave portion on the lower surface side of the substrate 12 of the impeller 10.

  As shown in FIGS. 2 to 4, on the outer peripheral side of one axial end surface of the motor body 21 from which the rotating shaft 22 protrudes, a terminal portion 21a for connecting a power supply cable and power to the rotor are supplied. A pair of brush portions 21b for supplying is provided. The pair of brush portions 21b are arranged at positions facing the rotation shaft 22 at substantially the same distance from the terminal portion 21a, respectively, and radially outside the other portion of the axial end surface of the motor body 21 and Projects outward in the axial direction.

  As shown in FIGS. 3 and 4, the casing 30 is provided on the lower side of the first casing 31 that covers the upper side of the impeller 10, the second casing 32 that covers the lower side of the impeller 10, and the second casing 32. And a third casing 33 formed.

  The 1st casing 31 has the upper surface board 31a which covers the upper side of the impeller 10, and the upper side surface board 31b extended below from the outer peripheral part of the upper surface board 31a. A suction port 31c for sucking air outside the casing 30 into the casing 30 is provided at a central portion in the radial direction of the upper surface plate 31a.

  The 2nd casing 32 has the lower surface board 32a which covers the lower side of the impeller 10, and the lower side surface board 32b extended upwards from the outer peripheral part of the lower surface board 32a. The second casing 32 is assembled to the first casing 31 by inserting the upper end of the lower side plate 32b into the groove provided at the lower end of the upper side plate 31b of the first casing 31. In addition, the electric motor 20 is attached to a central portion in the radial direction of the lower surface plate 32a via a motor flange 32c.

  The motor flange 32c is made of a disk-shaped member, and an engaging portion 32d that is engaged with the lower surface plate 32a of the second casing 32 is provided on the outer peripheral portion, and for fixing the electric motor 20 to the central portion in the radial direction. A motor fixing portion 32e is provided. The motor fixing portion 32e has a cylindrical shape extending in the vertical direction, and the motor main body 21 is fitted therein. The motor fixing portion 32e has a cylindrical lower end portion that is closed, and an upper end portion that protrudes upward from the upper surface of the motor flange 32c. The electric motor 20 is fixed by fastening the lower end portion of the motor fixing portion 32e and the lower end portion of the motor main body 21 with a fastening member such as a bolt. In addition, a communication hole 32f through which air for cooling the electric motor 20 can pass is formed at the lower end of the cylindrical shape of the motor fixing portion 32e.

  As shown in FIG. 2, the upper side plate 31 b and the lower side plate 32 b are distances from the rotation axis of the impeller 10 from a predetermined position S away from the rotation axis of the impeller 10 toward the rotation direction of the impeller 10. The spiral portion 30a is gradually increased, the straight portion 30b linearly extending from the end portion located radially outward of the spiral portion 30a, and the end portion located radially inward of the spiral portion 30a from a predetermined end portion. It has a tongue portion 30c having a radius of curvature and extending in a direction opposite to the spiral portion 30a, and an extending portion 30d extending in parallel to the linear portion 30b at an interval.

  A discharge port for discharging the air in the casing 30 is provided between the first casing 31 and the second casing 32 in a portion surrounded by the upper surface plate 31a, the lower surface plate 32a, the straight portion 30b, and the extending portion 30d. 30e is formed.

  Between the outer periphery of the impeller 10 and the spiral portion 30a between the first casing 31 and the second casing 32, as shown in FIG. 2 to FIG. A spiral air passage 30f for circulating the outer peripheral side in the rotation direction of the impeller 10 is provided. The width V of the spiral air passage 30f gradually increases in the radial direction from the start end to the end. Specifically, as shown in FIG. 2, the width dimension W of the spiral air passage 30 f at the position S at the radially inner end of the spiral portion 30 a centering on the rotation axis of the impeller 10 is the smallest, and the spiral The width dimension W of the spiral air passage 30f gradually increases toward the radially outer end of the portion 30a.

  Further, between the straight portion 30b and the extended portion 30d between the first casing 31 and the second casing 32, there is provided a discharge ventilation passage 30g that connects the terminal end portion of the spiral ventilation passage 30f and the discharge port 30e. ing.

  Further, a tongue 30c is located between the start end of the spiral air passage 30f and the discharge air passage 30g. The tongue 30c partitions the start end side of the spiral air passage 30f and the discharge air passage 30g.

  Further, the direction of the motor main body 21 of the electric motor 20 assembled to the casing 30 is an orientation in which the rotary shaft 22 is positioned between the tongue 30c and the terminal portion 21a in the casing 30, as shown in FIG. That is, the terminal portion 21a is positioned away from the tongue portion 30c.

  As shown in FIG. 4, the third casing 33 is provided on the lower side of the second casing 32 so as to extend between the vicinity of the discharge port 30 e and the lower end portion of the motor fixing portion 32 e. A communication passage 33a is formed between the second casing 32 and the third casing 33 to connect the discharge ventilation passage 30g and the communication hole 32f. In the communication path 33a, the air flowing through the discharge ventilation path 30g flows toward the communication hole 32f.

  A motor cover 34 for preventing water from entering the electric motor 20 is attached to the upper end of the motor fixing portion 32e of the motor flange 32c, as shown in FIGS.

  As shown in FIG. 5, the motor cover 34 is an annular member that can be fitted to the outer peripheral portion of the upper end portion of the motor fixing portion 32e. The motor cover 34 includes a cover main body 34a as a vertical wall that covers an outer peripheral portion excluding the terminal portion 21a on the upper end side of the motor main body 21 fixed to the motor fixing portion 32e, and a side surface side and an upper surface side of the terminal portion 21a. And a terminal cover part 34b as an overhanging part that covers.

  The cover main body 34a is a portion having an arc shape (dominant arc) larger than a semicircle. The cover body 34a is formed so that the inner diameter dimension on the lower end side is substantially the same as the outer diameter dimension on the outer peripheral portion of the upper end portion of the motor fixing portion 32e, and the inner diameter dimension on the upper end side is smaller than the inner diameter dimension on the lower end side. . The motor cover 34 attached to the upper end portion of the motor fixing portion 32e is restricted from moving downward when the upper end side of the cover body 34a contacts the upper end of the motor fixing portion 32e. Further, on the outer peripheral surface of the cover main body 34a, there is provided a water blocking wall 34c that is formed so as to extend radially outward in the circumferential direction and restricts the upward flow of water. The water blocking wall 34c extends obliquely downward from the outer peripheral surface. The water blocking wall 34c forms, for example, an angle of 45 degrees with respect to the outer peripheral surface of the cover main body 34a. In the water blocking wall 34c, the height dimension T with respect to the outer peripheral surface of the cover main body 34a gradually increases toward a portion facing the tongue portion 30c. That is, the height dimension T of the water blocking wall 34c is the smallest in the portion of the cover body 34a adjacent to the terminal cover portion 34b, and the portion of the cover body 34a facing the terminal cover portion 34b in the circumferential direction is the largest.

  The terminal cover part 34b has an arc (sub-arc) shape smaller than a semicircle, and connects both ends of the cover body 34a. The terminal cover part 34b projects to the outer peripheral side and the lower side from the cover main body 34a, and the lower end part is on the upper surface of the motor flange 32c with the motor cover 34 attached to the upper end of the motor fixing part 32e of the motor flange 32c. In contact. The terminal cover 34b includes a pair of first side walls 34d extending from the both ends of the cover main body 34a to the outside in the radial direction of the cover main body 34a, a second side wall 34e connecting the ends of the first side walls 34d, have. As for the 1st side wall 34d and the 2nd side wall 34e, the upper side has protruded to the outer peripheral side rather than the lower side. That is, the first side wall 34d and the second side wall 34e extend upward at an acute angle (for example, 80 degrees) with respect to the upper surface of the motor flange 32c.

  The motor cover 34 is formed such that the front end portion of the water blocking wall 34c and the upper end portions of the first side wall 34d and the second side wall 34e are continuous. When the motor cover 34 is formed by injection molding of a resin material, the leading end portion of the water blocking wall 34c and the upper end portions of the first side wall 34d and the second side wall 34e serve as parting lines.

  In the blower 1 configured as described above, when the electric motor 20 is driven, the impeller 10 rotates in one circumferential direction. When the impeller 10 rotates, the air outside the casing 30 is sucked between the first casing 31 and the second casing 32 through the suction port 31 c provided in the first casing 31. Air sucked between the first casing 31 and the second casing 32 through the suction port 31 c flows inward from the upper end side of the impeller 10, and flows out radially from the outer peripheral portion of the impeller 10. The air that flows out radially from the outer periphery of the impeller 10 flows through the spiral air passage 30f and the discharge air passage 30g between the first casing 31 and the second casing 32, and most of the air is discharged from the discharge port 30e. At the same time, a part of the air flows through the communication path 33 a and is guided to the motor body 21 of the electric motor 20.

  When the blower 1 is applied to a blowing means of a vehicle air conditioner, outdoor air may be sucked from the suction port 31c. For this reason, when the vehicle travels during rain, rainwater may enter from the inlet 31c together with outdoor air. In this case, water that has entered between the first casing 31 and the second casing 32 accumulates on the lower surface plate 32a of the second casing 32 and the upper surface of the motor flange 32c.

  The water accumulated on the lower surface plate 32a of the second casing 32 and the upper surface of the motor flange 32c flows mainly on the outer peripheral side of the spiral air passage 30f together with the air due to the air flow of the spiral air passage 30f. Since the width dimension W of the spiral air passage 30f is the smallest in the portion where the tongue portion 30c is adjacent, the water flowing through the spiral air passage 30f and the electric motor 20 in the portion where the tongue portion 30c of the spiral air passage 30f is adjacent. In some cases, the distance becomes short and water reaches the motor fixing portion 32e.

  As shown in FIG. 2, the motor flooded region where water flowing through the spiral air passage 30 f easily reaches the motor main body 21 is an end portion on the radially inner side of the spiral portion 30 a centering on the rotation axis of the impeller 10. The position S is a range of a position rotated by a second angle θ2 toward the rotation direction of the impeller 10 from a position rotated by the first angle θ1 degree toward the opposite side to the rotation direction of the impeller 10. In the present embodiment, the first angle θ1 is 30 degrees and the second angle θ2 is 145 degrees.

  In the motor flooded region of the spiral air passage 30f, the water blocking wall 34c of the cover main body 34a of the motor cover 34 is located on the upper side of the cover main body 34a. Thereby, the water that has reached the motor fixing portion 32e flows upward on the outer peripheral surface of the cover body 34a of the motor cover 34 and collides with the lower surface of the water blocking wall 34c, as indicated by an arrow in FIG. Since the water flows along the lower surface of the water blocking wall 34c extending obliquely downward, water is guided to the outer peripheral side of the motor cover 34 without reaching the electric motor 20.

  The water blocking wall 34c is formed so that the height dimension T gradually increases from a portion adjacent to the terminal cover portion 34b toward a portion facing the tongue portion 30c of the spiral air passage 30f. Accordingly, no step is formed in the water blocking wall 34c extending in the circumferential direction of the cover main body 34a, so that the water flowing through the spiral air passage 30f is not disturbed by the water blocking wall 34c.

  Further, the amount of water reaching the motor cover 34 is smaller than that in the motor flooded area outside the motor flooded area of the spiral air passage 30f, and the water reaching the motor cover 34 is located on the lower side of the cover body 34a. The water intrusion into the electric motor 20 is restricted by the water blocking wall 34c. Further, the water that has reached the first side wall 34d and the second side wall 34e of the terminal cover part 34b projecting from the outer peripheral part of the cover body 34a has an outer periphery on the upper side rather than the lower side as shown by arrows in FIG. It flows upward along the first side wall 34 d and the second side wall 34 e that project to the side, and is guided to the outer peripheral side of the motor cover 34.

  Thus, according to the blower of the present embodiment, the upper end portion of the motor fixing portion 32e that extends upward from the inner surface of the casing 30 and surrounds the side of the electric motor 20, the cover main body 34a, and the circumferential direction of the cover main body 34a. A water blocking wall 34c extending obliquely downward on the outer side in the radial direction from the outer peripheral surface of the cover main body 34a. The water blocking wall 34c has a height dimension T on the outer peripheral surface of the cover main body 34a. It gradually increases toward the portion facing the tongue portion 30c that partitions the start end portion of the passage 30f and the discharge ventilation passage 30g.

  Thereby, since the flow of water to the electric motor 20 side can be regulated centering on the portion where water easily enters the electric motor 20 in the spiral air passage 30f, the electric motor is extended over the entire circumference of the spiral air passage 30f. The distance between the electric motor 20 and the impeller 10 can be made smaller than in the case of configuring a structure that restricts the entry of water into the 20 side, and the size can be reduced.

  Further, the motor cover 34 is provided with a terminal cover portion 34b extending along the inner surface of the casing toward the radially outer side according to the shape of the outer peripheral portion of the electric motor 20, and the outer periphery of the terminal cover portion 34b is provided on the outer peripheral portion of the terminal cover portion 34b. The first side wall 34d and the second side wall 34e are provided so that the upper side protrudes from the lower side toward the outer peripheral side.

  Thus, the water that has reached the terminal cover portion 34b flows upward along the first side wall 34d and the second side wall 34e and is guided to the outer peripheral side of the motor cover 34, so that the water enters the electric motor 20. Can be prevented

   6 to 7 show a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected and shown to the component similar to the said embodiment.

  The motor cover 34 of this embodiment does not have the water blocking wall 34c in the first embodiment, and projects from the upper end of the cover main body 34a to the inner peripheral side of the motor cover 34 so that a part of the upper surface of the electric motor 20 is seen from above. An upper surface cover portion 34f is covered. The upper surface cover portion 34f is formed in a predetermined range including a portion facing the tongue portion 30c in the circumferential direction of the cover main body 34a. That is, the upper surface cover portion 34f is formed so as to extend in the circumferential direction between the pair of brush portions 21b of the motor main body 21 including a portion facing the tongue portion 30c. In addition, a standing portion 34g extending upward in the circumferential direction is provided at the inner peripheral end of the upper surface cover portion 34f.

  In the blower configured as described above, in the motor flooded region of the spiral air passage 30f, the motor cover 34 protrudes from the upper end of the cover main body 34a toward the inner peripheral side of the motor cover 34, and a part of the upper surface of the electric motor 20 is upward. An upper surface cover portion 34f that covers from is located. As a result, even when the water reaching the motor fixing portion 32e gets over the cover main body 34a of the motor cover 34 as shown by the arrow in FIG. The flow is restricted and does not reach the electric motor 20.

  Thus, according to the blower of the present embodiment, the upper end of the motor fixing portion 32e that extends upward from the inner surface of the casing 30 and surrounds the side of the electric motor 20 and the cover main body 34a, and the motor cover 34 from the cover main body 34a. An upper cover portion 34f that projects from the upper side and covers a part of the upper surface of the motor main body 21 from above, and the upper cover portion 34f is a spiral air passage in the casing 30 in the circumferential direction of the cover main body 34a. It is formed in a predetermined range including a portion facing the tongue portion 30c that partitions the start end portion of 30f and the discharge ventilation passage 30g.

  Thereby, since the flow of water to the electric motor 20 side can be regulated centering on the portion where water easily enters the electric motor 20 in the spiral air passage 30f, the electric motor is extended over the entire circumference of the spiral air passage 30f. The distance between the electric motor 20 and the impeller 10 can be made smaller than in the case of configuring a structure that restricts the entry of water into the 20 side, and the size can be reduced.

  Further, the upper surface cover portion 34f has a standing portion 34g extending upward from the inner peripheral end portion.

  Thereby, since the flow of water from the upper surface of the upper surface cover part 34f to the electric motor 20 side can be regulated by the standing part 34g, the flow of water to the electric motor 20 side can be more reliably regulated. It becomes possible.

  In addition, in the said embodiment, it is also possible to apply to ventilation means, such as an air conditioning apparatus in the room | chamber interior of a building, and a ventilation apparatus other than the sending means of the air conditioning apparatus for vehicles.

  Moreover, in the said embodiment, although what showed the rotating shaft of the impeller 10 and the rotating shaft 22 of the electric motor 20 to the up-down direction was shown, the rotating shaft of the impeller 10 and the rotating shaft 22 of the electric motor 20 were set to the perpendicular direction. For example, a state in which the tilt is about 5 degrees with respect to the vertical direction is included.

  In the above embodiment, the electric motor 20 is attached to the casing 30 via the motor flange 32c. However, the electric motor 20 is directly attached to the second casing without the motor flange 32c. May be.

  In the above embodiment, the motor cover 34 is attached to the upper end portion of the motor fixing portion 32e of the motor flange 32c so as to prevent water from entering the electric motor 20. However, the present invention is not limited to this. However, without using the motor cover 34, water can enter the electric motor 20 such as the water blocking wall 34c, the first side wall 34d, the second side wall 34e, and the upper surface cover part 34f at the upper end of the motor fixing part 32e. You may make it form the structure to regulate.

  DESCRIPTION OF SYMBOLS 1 ... Blower, 10 ... Impeller, 20 ... Electric motor, 21 ... Motor main body, 21a ... Terminal part, 30 ... Casing, 30c ... Tongue part, 30f ... Spiral ventilation path, 30g ... Discharge ventilation path, 31 ... 1st casing 32 ... 2nd casing, 32c ... Motor flange, 32e ... Motor fixing part, 34 ... Motor cover, 34a ... Cover body, 34b ... Terminal cover part, 34c ... Water stop wall, 34d ... 1st side wall, 34e ... 2nd Side wall, 34f ... upper surface cover portion, 34g ... standing portion.

Claims (4)

A cylindrical impeller that is arranged with the rotating shaft directed in the vertical direction, and allows air to flow in from the axial end and flow out of the outer periphery;
A motor connected to the lower side of the impeller and rotating the impeller;
A spiral air passage that is provided so as to surround the outer peripheral side of the impeller and that flows air that flows out of the outer peripheral portion of the impeller in the rotation direction of the impeller, and a discharge air that extends from the end portion of the spiral air passage toward the discharge port A casing formed with a path,
The part located under the impeller in the casing has a motor fixing part for fixing the motor,
The motor fixing portion has a vertical wall that extends upward from the inner surface of the casing and surrounds the side of the motor, and a water blocking wall that extends radially outward from the outer peripheral surface of the vertical wall over the circumferential direction of the vertical wall. And
The water blocking wall is characterized in that the height dimension on the outer peripheral surface of the vertical wall gradually increases toward a portion facing the tongue portion that partitions the start end portion of the spiral air passage and the discharge air passage in the casing. Blower. A cylindrical impeller that is arranged with the rotating shaft directed in the vertical direction, and allows air to flow in from the axial end and flow out of the outer periphery;
A motor connected to the lower side of the impeller and rotating the impeller;
A spiral air passage that is provided so as to surround the outer peripheral side of the impeller and that flows air that flows out of the outer peripheral portion of the impeller in the rotation direction of the impeller, and a discharge air that extends from the end portion of the spiral air passage toward the discharge port A casing formed with a path,
The part located under the impeller in the casing has a motor fixing part for fixing the motor,
The motor fixing portion includes a vertical wall that extends upward from the inner surface of the casing and surrounds the side of the upper end of the motor, and an upper surface cover that projects from the vertical wall to the inner peripheral side of the vertical wall and covers a part of the upper surface of the motor from above. And
The upper surface cover portion is formed in a predetermined range including a portion facing a tongue portion that partitions the start end portion of the spiral air passage and the discharge air passage in the casing in the circumferential direction of the vertical wall. The blower according to claim 2, wherein the upper surface cover portion includes a standing portion extending upward from an end portion on the inner peripheral side. The vertical wall is provided with an overhanging portion that protrudes along the inner surface of the casing toward the radially outer side according to the shape of the outer peripheral portion of the motor,
The blower according to any one of claims 1 to 3, wherein a side wall is provided on the outer peripheral portion of the projecting portion so that the upper side projects from the lower side toward the outer peripheral side.

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