JP2004068741A - Centrifugal blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal blower reducing noise and increasing degree of freedom in installation attitude. <P>SOLUTION: In a centrifugal blower provided with a centrifugal fan 1 sending air taking in from a direction of a rotating shaft 4 having many blades 6 provided around the rotating shaft 4 extending in a vertical direction at designated intervals to a radial direction, a driving motor 2 rotationally driving the centrifugal fan 1, a scroll casing 3 housing the centrifugal fan 1 and including an air flow passage 12 circulating air sent by the centrifugal fan 1 in a swirl shape around the centrifugal fan and discharging the air, an annular rib 14 formed projectingly upward on a part of periphery of the driving motor in the scroll casing and inhibiting air in the air flow passage from flowing in the driving motor side, and a notch part 15 formed on the rib and draining water in the driving motor side out to the air flow passage, an extension part 14c guiding air flowing in the air flow passage not to collide with the notch part is formed on the rib as one body. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a centrifugal blower used for a vehicle air conditioner or the like.
[0002]
[Prior art]
FIG. 3 is a schematic longitudinal sectional view showing an example of a centrifugal blower used for a vehicle air conditioner or the like, and FIG. 4 is a sectional view taken along line BB of FIG. The centrifugal blower includes a centrifugal fan 1, a drive motor 2 that rotationally drives the centrifugal fan 1, and a scroll casing 3 that houses the centrifugal fan 1.
[0003]
The centrifugal fan 1 has a rotating shaft 4 extending vertically, a bottom wall 5 having a central portion fixed to the rotating shaft 4 and having a circular shape in a plan view. .. Are fixed to the peripheral edge of the bottom wall 5 and a retaining ring 7 for fixing the upper ends of these wings 6, 6.
[0004]
The drive motor 2 includes a rotating unit 8 and a fixed unit 9. The rotating unit 8 is fixed to the rotating shaft 4 of the centrifugal fan 1, and the fixed unit 9 is fixed to the scroll casing 3. The bottom wall 5 of the centrifugal fan 1 is formed in a mountain shape in cross section so as to be able to receive the rotating part 8 of the drive motor 2 from below. Further, a plurality of through holes 5a are formed in the bottom wall 5.
[0005]
The scroll casing 3 is formed of a synthetic resin or the like, has a bell mouth 10 forming an air inlet on the upper surface, and has an opening 11 for receiving the fixed portion 9 of the drive motor 2 on the bottom surface. An air flow path 12 is formed around the opening 11 for discharging air blown by the centrifugal fan 1 in a spiral manner around the centrifugal fan 1 as shown by an arrow in FIG. Reference numeral 13 denotes a discharge port.
[0006]
When the drive motor 2 is driven, the centrifugal fan 1 rotates around the rotation shaft 4, and air is sucked from above the scroll casing 3 in the direction of the rotation shaft 4. This air is blown radially outward through the space between the blades 6, 6,..., Spirals around the air flow path 12, and is discharged from the discharge port 13.
[0007]
At this time, when the air flowing in the air flow path 12 flows into the drive motor 2 side, an abnormal noise is generated. Therefore, an annular rib 14 protruding upward is formed in a portion of the scroll casing 3 around the drive motor 2. The air in the air passage 12 is prevented from flowing into the drive motor 2.
[0008]
If the ribs 14 are endlessly continuous, the water sucked together with the air by the centrifugal fan 1 may stay inside the ribs 14 to emit a strange odor or corrode the drive motor 2. Therefore, a notch 15 is provided in the rib 14 so that the water inside the rib 14 is discharged into the air flow path 2 together with the air flow generated by the centrifugal fan 1.
[0009]
[Problems to be solved by the invention]
However, when such a notch 15 is provided, there is a problem that an air flow passing through the air flow path 12 hits the notch 15 and generates abnormal noise. In particular, when the centrifugal blower is installed so as to be inclined so that the discharge port 13 faces down, the notch 15 is provided at the lowest part of the rib 14, that is, in the vicinity of the discharge port 13 in order to drain the water inside the rib 14. There is a need. However, since the blowing pressure is large near the discharge port 13, if the notch 15 is provided in this portion, the noise is increased. Therefore, conventionally, the notch 15 cannot be provided in the vicinity of the discharge port 13, and the centrifugal blower cannot be installed so that the discharge port 13 is located below.
[0010]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a centrifugal blower in which noise is reduced and the degree of freedom of an installation posture is improved.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a large number of blades are provided at predetermined intervals around a vertically extending rotation axis, and blows air taken in from the direction of the rotation axis in a radially outward direction. A scroll having a centrifugal fan, a drive motor for rotating and driving the centrifugal fan, and an air flow path for accommodating the centrifugal fan and for discharging air blown by the centrifugal fan in a spiral around the centrifugal fan. A casing, and an annular rib that is formed to protrude upward at a portion around the drive motor inside the scroll casing and that prevents air in the air flow path from flowing into the drive motor. A notch formed in the rib for draining water inside the rib into the air flow path; It is characterized in that a guide for straightening member so as not to hit the air to the notch.
[0012]
According to a second aspect of the present invention, in the centrifugal blower according to the first aspect, the rectifying member is formed integrally with the scroll casing.
[0013]
According to a third aspect of the present invention, in the centrifugal blower according to the first or second aspect, the rectifying member is formed to extend substantially parallel to the air flow path.
[0014]
【The invention's effect】
According to the first aspect of the present invention, since the air flowing in the air flow path is guided so that the rectifying member does not hit the cutout portion, no abnormal noise occurs. Therefore, the notch can be provided at any part of the rib, and the rib can be installed so that the discharge port faces downward, so that the degree of freedom of the installation posture is improved.
[0015]
According to the second aspect of the present invention, since the rectifying member is formed integrally with the scroll casing, the number of parts and the manufacturing cost are reduced.
[0016]
According to the third aspect of the invention, since the flow regulating member is formed to extend substantially parallel to the air flow path, the resistance at the time of blowing is reduced.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a centrifugal blower according to one embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.
In the present embodiment, the same or similar portions as those in the above-described conventional example are denoted by the same reference numerals, and redundant description is omitted.
[0018]
This centrifugal blower forms a part of a vehicle air conditioning unit, and is taken in from an outside air intake (not shown) for taking in air outside the vehicle compartment and an inside air intake (not shown) for taking in air inside the vehicle compartment. It guides air to an evaporator (not shown).
[0019]
In the present embodiment, the notch 15 is provided in a portion of the rib 14 near the discharge port 13. The rib 14 extends substantially parallel to the air passage 12 and opposes a portion 14 a of the rib 14 on the upstream side of the notch 15, with an air gap 16 facing the outside surface of the portion 14 b of the rib 14 on the downstream side of the notch 15. The extension 14c (rectifying member) is formed integrally. The distal end of the extension 14c is separated from the nose 3a of the scroll casing 3.
[0020]
According to such a configuration, the water inside the rib 14 enters the gap 16 from the notch 15 together with the airflow generated by the centrifugal fan 1, and passes through the space between the extension 14 c and the nose 3 a to form the air passage 12. Flows into.
[0021]
The air flowing in the air flow path 12 is guided by the extension 14c in the direction of the discharge port 13 and is prevented from hitting the notch 15, so that no abnormal noise is generated. Therefore, there is no problem even if the notch 15 is located in the vicinity of the discharge port 13 where the blowing pressure is high.
[0022]
In this embodiment, since the extension 14c is formed so as to extend substantially parallel to the air flow path 12, the air resistance generated between the air flowing in the air flow path 2 and the extension 14c is small, The blowing resistance does not increase during blowing.
[0023]
According to the present invention, the cutout portion can be provided at any part of the rib, and the centrifugal blower can be installed so that the discharge port side with a high blowing pressure is downward, so that the installation posture of the centrifugal blower can be set. The degree of freedom is improved, the design becomes easier, and the performance of the air conditioner and the like can be improved.
[0024]
The present invention is not limited to the above embodiment, and various modifications can be made to the above embodiment without departing from the gist of the present invention.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a centrifugal blower according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a schematic longitudinal sectional view of a conventional centrifugal blower.
FIG. 4 is a sectional view taken along line BB of FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Centrifugal blower 2 Drive motor 3 Scroll casing 4 Rotating shaft 6 Blade 12 Air flow path 13 Discharge port 14 Rib 14c Extension (rectification member)
15 Notch

Claims (3)

A number of blades are provided at predetermined intervals around a vertically extending rotating shaft, a centrifugal fan that blows air taken in from the direction of the rotating shaft in a radial direction, a drive motor that rotationally drives the centrifugal fan, A scroll casing having an air flow path for accommodating the centrifugal fan and discharging the air blown by the centrifugal fan in a spiral around the centrifugal fan, wherein the scroll casing has a periphery of the drive motor inside the scroll casing. An annular rib formed so as to protrude upward at a position and preventing air in the air flow path from flowing into the drive motor; and water formed inside the rib and flowing inside the rib in the air flow path. Rectifier for guiding air flowing through the air flow path so as not to hit the notch in a centrifugal blower provided with a notch for draining water to the notch. Centrifugal blower, characterized in that a wood. The centrifugal blower according to claim 1, wherein the rectifying member is formed integrally with the scroll casing. 3. The centrifugal blower according to claim 1, wherein the rectifying member is formed to extend substantially parallel to the air flow path.

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