JP2017180186A - Vehicular centrifugal fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular centrifugal fan for suppressing the generation of vibration and noise while raising a total pressure by increasing the opening area of a suction opening of a housing encircling a Sirocco fan.SOLUTION: The vehicular centrifugal fan includes a Sirocco fan 3 having a plurality of blades 3b annularly arrayed, and an annular shroud 3c connected to the ends of the blades 3b at the side of a suction opening 2d and extending from the rear edges of the blades 3b linearly along the axis of the Sirocco fan 3, and housing 2 having an opening edge 2e annularly formed along the edge of the suction opening 2d and erected along the shroud 3c of the Sirocco fan 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a centrifugal blower for vehicles.

  The vehicle air conditioner is provided with a vehicle centrifugal blower for forming an air flow. Such a mind-body blower for a vehicle usually includes a sirocco fan and a housing that surrounds the sirocco fan, and the sirocco fan draws air taken in from the suction opening of the housing that is opened in the axial direction of the sirocco fan. The air blown by the sirocco fan is collected in the scroll flow path and discharged from the discharge opening of the housing.

  By the way, the sirocco fan has a shape in which a plurality of blades having a wing-shaped cross section are arranged in an annular shape with respect to the base at the center. Further, the sirocco fan has a shroud connected to the end of the blade. The shroud is connected to the end of the blade housing on the suction opening side, and has an annular shape when viewed from the direction along the axis of the sirocco fan. Furthermore, the housing has an opening edge portion formed so as to stand along the edge portion of the suction opening. By arranging such a shroud close to the opening edge of the housing, the air blown by the sirocco fan is prevented from leaking from the suction opening of the housing.

JP 2014-181679 A

  However, as disclosed in Patent Document 1, the shroud of the sirocco fan is reduced in diameter toward the outside of the housing. For this reason, the opening edge part of a housing also becomes a shape diameter-reduced toward the outer side of the housing along the shroud of a sirocco fan. As a result, the opening area of the suction opening is reduced, leading to a decrease in the total pressure of the vehicle centrifugal blower. Moreover, if the opening area of the suction opening is narrow, the fluidity of the air flowing in deteriorates, causing vibration and noise.

  The present invention has been made in view of the above-described problems. In a centrifugal blower for a vehicle, the opening area of a suction opening of a housing surrounding a sirocco fan is widened to increase the total pressure and suppress the generation of vibration and noise. With the goal.

  In order to achieve the above object, according to the present invention, as a first means, there is provided a vehicle centrifugal blower comprising a sirocco fan and a housing that surrounds the sirocco fan and has a suction opening that exposes a suction area of the sirocco fan. The sirocco fan is connected to a plurality of blades arranged in an annular shape and an end of the blade on the suction opening side, and linearly extends from the rear edge of the blade along the axis of the sirocco fan. An annular shroud that extends, and the housing has an opening edge that is annularly formed along the edge of the suction opening and that is erected along the shroud of the sirocco fan Is adopted.

  According to the present invention, the sirocco fan has an annular shroud extending linearly from the trailing edge of the blade along the axis of the sirocco fan. That is, in the present invention, the shroud of the sirocco fan does not have a shape that is reduced in diameter toward the outside of the housing. For this reason, in the present invention, the opening edge portion of the housing is also formed along the shroud of the sirocco fan, so that the diameter is not reduced toward the outside of the housing (the narrowed shape). As described above, according to the present invention, since it is not necessary to make the opening edge of the housing narrowed, it is possible to ensure a wide opening area of the housing. Therefore, according to the present invention, it is possible to increase the opening area of the suction opening of the housing surrounding the sirocco fan, increase the total pressure, and suppress the generation of vibration and noise.

It is a longitudinal section showing a schematic structure of a centrifugal blower for vehicles in one embodiment of the present invention.

  Hereinafter, an embodiment of a centrifugal blower for a vehicle according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

  FIG. 1 is a longitudinal sectional view showing a schematic configuration of a centrifugal blower 1 for a vehicle according to the present embodiment. The centrifugal blower 1 for vehicles of this embodiment comprises a part of vehicle air conditioner mounted in a vehicle, and discharges the air supplied via an inside / outside air switching device toward a cooler unit or the like. Such a centrifugal blower 1 for vehicles is arrange | positioned, for example in the vehicle interior front of a vehicle.

  As shown in FIG. 1, a vehicular centrifugal blower 1 includes a housing 2 connected to a case of an inside / outside air switching device, a sirocco fan 3 housed in the housing 2, and a motor 4 that rotationally drives the sirocco fan 3. And.

  The housing 2 is divided into an upper housing 2a and a lower housing 2b, and is a hollow member formed by assembling the upper housing 2a and the lower housing 2b.

  Such a housing 2 has an accommodation space in which the sirocco fan 3 is accommodated, and a scroll-like channel (hereinafter referred to as a scroll channel 2c). The accommodation space of the sirocco fan 3 is provided in a substantially central portion of the housing 2 when viewed from the direction along the axis of the sirocco fan 3. Further, the scroll flow path 2 c is provided on the outer side in the radial direction of the accommodation space of the sirocco fan 3 when viewed from the direction along the axis of the sirocco fan 3 so as to surround the accommodation space of the sirocco fan 3. Such a scroll channel 2 c is formed so that the downstream end thereof extends in the tangential direction of the accommodation space of the sirocco fan 3 when viewed from the direction along the axis of the sirocco fan 3.

  The housing 2 has a suction opening 2d for taking air into the housing 2 and a discharge opening (not shown) for discharging air to the outside. As shown in FIG. 1, the suction opening 2 d is formed in the upper housing 2 a and exposes an air suction area (area surrounded by a blade 3 b described later) of the sirocco fan 3. Such a suction opening 2d is a circular opening arranged concentrically with the shaft core when viewed from the direction along the shaft core of the sirocco fan 3. The discharge opening is formed at the most downstream end of the scroll flow path 2c, and the air discharged to the outside in the radial direction of the sirocco fan 3 and flowing through the scroll flow path 2c is outside the housing 2 (outside the vehicular centrifugal blower 1). To discharge.

  Furthermore, the housing 2 has an opening edge 2e formed along the edge of the suction opening 2d. The opening edge 2e is formed in the upper housing 2a, and is erected so as to surround the entire area of the suction opening 2d with respect to the main body of the upper housing 2a. Such an opening edge 2e has a root 2e1 connected to the main body of the upper housing 2a and extends linearly toward the outside of the upper housing 2a along the axis of the sirocco fan 3. Moreover, the front-end | tip part 2e2 of the opening edge part 2e is curved toward the radial inside of the suction opening 2d so that the front-end | tip part of the shroud 3c mentioned later of the sirocco fan 3 may be covered.

  As will be described later, in the present embodiment, the shroud 3 c of the sirocco fan 3 has a shape extending linearly along the axis of the sirocco fan 3. That is, in the present embodiment, the shroud 3 c of the sirocco fan 3 and the opening edge 2 e of the housing 2 are both linearly extended along the axis of the sirocco fan 3. That is, the housing 2 has an opening edge 2 e that is formed in an annular shape along the edge of the suction opening 2 d and is erected along the shroud 3 c of the sirocco fan 3.

  The sirocco fan 3 has a base portion 3a, a plurality of blades 3b, and a shroud 3c. The base portion 3a is a portion that supports the blade 3b, and has a bowl shape in which the center is raised and the inside is hollow. The output shaft of the motor 4 is fixed inside the base portion 3a. The blade 3b has a lower end fixed to the base portion 3a, and a plurality of blades 3b are arranged at equal intervals in the circumferential direction when viewed from the direction along the axis of the sirocco fan 3. When the base portion 3a is rotationally driven by the motor 4, these blades 3b are rotated around the axis of the sirocco fan 3, and scavenge air outward from the region surrounded by the plurality of blades 3b. As a result, an air flow is formed.

  The shroud 3c is an annular portion connected to the upper ends (end portions on the suction opening 2d side) of all the blades 3b. The shroud 3c extends linearly along the axis of the sirocco fan 3 from the rear edge of the blade 3b. In the present embodiment, the region where the blade 3b and the shroud 3c overlap in the direction along the axis of the sirocco fan 3 is not formed. In this way, even when the region where the blade 3b and the shroud 3c do not overlap is formed, the amount of work with respect to the air at the end of the blade 3b on the suction opening 2d side is extremely small. The performance of 3 is not reduced. On the other hand, by not forming a region where the blade 3b and the shroud 3c overlap, the blade 3b can be made shorter than the conventional one, and the blade 3b can be reduced in weight.

  As shown in FIG. 1, the shroud 3 c is disposed close to the opening edge 2 e of the housing 2 with a slight gap therebetween. Such a shroud 3c prevents the air inside the housing 2 from leaking out of the housing 2 through the gap between the shroud 3c and the opening edge 2e of the housing 2 together with the opening edge 2e of the housing 2. To do.

  The motor 4 generates power for rotationally driving the sirocco fan 3 and is disposed on the opposite side of the housing 2 from the suction opening 2d. The motor 4 is electrically connected to a control unit (not shown), and rotates the sirocco fan 3 at a predetermined rotational speed under the control of the control unit.

  In the vehicular centrifugal blower 1 of the present embodiment having such a configuration, when the sirocco fan 3 is rotationally driven by the motor 4, air is taken into the housing 2 from the opening edge 2 e of the housing 2. The air taken into the housing 2 is supplied to a region surrounded by the blade 3b of the sirocco fan 3, and is pumped to a region outside the sirocco fan 3 in the radial direction by the blade 3b. The air pumped to the outside in the radial direction of the sirocco fan 3 is collected in the scroll flow path 2c of the housing 2 and discharged from the discharge opening (not shown) of the housing 2 to the outside of the centrifugal fan 1 for the vehicle.

  According to the centrifugal blower 1 for a vehicle of this embodiment, the sirocco fan 3 has the annular shroud 3c extending linearly along the axis of the sirocco fan 3 from the rear edge of the blade 3b. Yes. That is, in the vehicular centrifugal blower 1 of the present embodiment, the shroud 3c of the sirocco fan 3 is not shaped to be reduced in diameter toward the outside of the housing 2. For this reason, in the centrifugal blower 1 for a vehicle according to the present embodiment, the opening edge 2e of the housing 2 is also formed along the shroud 3c of the sirocco fan 3, so that the diameter is reduced toward the outside of the housing 2. It is not in shape (squeezed shape). Thus, according to the centrifugal blower 1 for vehicles of this embodiment, since it is not necessary to set it as the shape where the opening edge part 2e of the housing 2 was restrict | squeezed, the opening area of the housing 2 can be ensured widely. Therefore, according to the vehicle centrifugal blower 1 of the present embodiment, it is possible to widen the opening area of the suction opening 2d of the housing 2 surrounding the sirocco fan 3, increase the total pressure, and suppress the generation of vibration and noise. .

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

  For example, the cross-sectional shape of the blade 3b of the above embodiment can be a flat plate shape or an arc shape in addition to the blade shape, and is not particularly limited. The number of blades 3b shown in FIG. 1 is an example, and the number of blades 3b can be changed.

  DESCRIPTION OF SYMBOLS 1 ... Centrifugal blower for vehicles, 2 ... Housing, 2d ... Suction opening, 2e ... Opening edge part, 3 ... Sirocco fan, 3b ... Blade, 3c ... Shroud

Claims (1)

A vehicle centrifugal blower comprising: a sirocco fan; and a housing that surrounds the sirocco fan and has a suction opening that exposes a suction region of the sirocco fan,
The sirocco fan is connected to a plurality of annularly arranged blades and an end portion of the blade on the suction opening side, and extends linearly from the rear edge of the blade along the axis of the sirocco fan. An annular shroud,
The housing has an opening edge portion that is formed in an annular shape along an edge portion of the suction opening and is erected along the shroud of the sirocco fan.

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