JP2006152936A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized blower without increase in noise or degradation in blowing efficiency. <P>SOLUTION: The blower comprises: a spiral casing 2 having an approximately circular suction port 2a formed in at least one side face, and an approximately rectangle discharge port 2b formed in a front face; and a blower fan 1 disposed to an air passage connecting the suction port 2a with the discharge port 2b. The width of the casing 2 is sequentially increased from the suction port 2a up to an arbitrary position along a flow direction of air, and is constant from the arbitrary position to the discharge port 2b. An inclined face 2d is formed to gradually increase the width of the casing 2 from both ends of a nose part 2c starting spiral of the casing 2 to both ends of the discharge port 2b. The inclined face 2d reduces a windless area in the casing 2 and thereby to reduce the noise and improve the blowing efficiency. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a blower, and more particularly, to a blower that is configured by a centrifugal blower casing and an impeller and is used in an air conditioner or the like.

  In a suspended ceiling type or duct concealing type air conditioner or various ventilation devices, a blower of a centrifugal blower fan is used (for example, see Patent Document 1).

  The conventional blower disclosed in Patent Document 1 will be described with reference to FIGS.

  As shown in FIG. 6, a general blower of this type includes a spiral casing 2 having a substantially circular suction port 2a on at least one side surface and a substantially rectangular discharge port 2b on the front surface, and these It comprises a centrifugal blower fan 1 provided in an air passage connecting the suction port 2a and the discharge port 2b, and the outer periphery of the suction port 2a extends from both ends of the winding nose portion 2c of the casing 2 to both ends of the discharge port 2b. It is comprised so that a surface may be expanded sequentially.

By adopting such a configuration, the casing 2 can be downsized without downsizing the impeller.
JP-A-9-287756

  However, in the configuration of the conventional blower, as shown in FIG. 7, there is a problem in that wind does not flow in the portion indicated by hatching B, turbulence occurs, and ventilation resistance increases, leading to a decrease in blower efficiency and an increase in noise. there were.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a blower that reduces a no-wind region in a casing, reduces noise, and improves blowing efficiency.

  In order to solve the above-described conventional problems, the blower of the present invention includes a spiral casing having a substantially circular suction port on at least one side surface and a substantially rectangular discharge port on the front surface, and the suction port. A blower fan provided in an air passage communicating with the discharge port, the width of the casing is sequentially expanded from the suction port to an arbitrary position along the flow direction of the wind, and from the arbitrary position to the discharge port An inclined surface for gradually increasing the width of the casing is formed from both ends of the winding start nose portion of the casing to both ends of the discharge port. The inclined surface causes no wind in the casing. The area can be reduced, noise can be reduced, and air blowing efficiency can be improved.

  The blower of the present invention can achieve downsizing of the casing without an increase in noise and a reduction in blowing efficiency.

  A first invention includes a spiral casing having a substantially circular suction port on at least one side surface and a substantially rectangular discharge port on a front surface, and an air passage that communicates the suction port and the discharge port. The casing has a width of the casing, and gradually expands the width of the casing from the suction port to an arbitrary position along the flow direction of the wind and is substantially constant from the arbitrary position to the discharge port. An inclined surface for gradually increasing the width of the casing is formed from both ends of the part to both ends of the discharge port. The inclined surface reduces the no-wind area in the casing, reduces noise, and blows air. Efficiency can be improved.

  In the second invention, in particular, the expansion ratio of the width of the casing of the first invention is increased from both ends of the winding start nose portion to both ends of the discharge port. It is possible to further reduce noise and improve the air blowing efficiency in response to the increase in the blowout flow from the airflow and the decrease in the no-wind region.

  In the third aspect of the invention, in particular, the expansion of the width of the casing of the first or second aspect of the invention is started from the lower part of the casing, and the casing is further reduced in size without increasing noise or lowering the blowing efficiency. Is possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a perspective view of a blower according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of the blower, and FIG. 3 is a side view of the blower and a cross-sectional view of each part. .

  1 to 3, the blower in the present embodiment includes a spiral casing 2 provided with a substantially circular suction port 2a on at least one side surface and a substantially rectangular discharge port 2b on the front surface, and these suction ports. The air passage connecting the 2a and the discharge port 2b is provided with a centrifugal blower fan 1, and the width of the casing 2 is sequentially expanded from the suction port 2a to an arbitrary position along the flow direction of the wind. An inclined surface 2d for gradually increasing the width dimension of the casing 2 is formed from the arbitrary position to the discharge port 2b from both ends of the winding start nose portion 2c of the casing 2 to both ends of the discharge port 2b. is doing.

  In FIG. 3, the width of the casing 2 in each AA, BB, CC, DD section is L1> L2> L3> L4, and the angle Θ indicating the enlargement ratio of the section is Each cross section is equal. That is, Θ1 = Θ2 = Θ3 = Θ4.

  With the above configuration, it is possible to reduce the no-wind region in the casing 2, reduce noise, and improve air blowing efficiency.

(Embodiment 2)
4A is a side view of the blower according to the second embodiment of the present invention, FIG. 4B is a cross-sectional view taken along line EE of FIG. 4A, and FIG. 4C is FIG. 4A is a cross-sectional view taken along line FF in FIG. 4A, FIG. 4D is a cross-sectional view taken along line GG in FIG. 4A, and FIG. 4E is a cross-sectional view taken along line HH in FIG.

  In the present embodiment and the first embodiment, the enlargement ratio up to an arbitrary position in each cross section increases from both ends of the nose portion 2c at the start of winding of the casing 2 to both ends of the discharge port 2b. Are different. Others are the same as those in the first embodiment.

  The width of the casing 2 in each of the EE, FF, GG, and HH cross sections is L1> L2> L3> L4, and the angle Θ indicating the magnification of the cross section is E- It increases from the E cross section to the HH cross section. That is, Θ1 <Θ2 <Θ3 <Θ4.

  With the above configuration, it is possible to cope with the fact that the blowout flow from the blower fan 1 is gradually increased from the beginning of winding of the casing 2 and the no-wind region is reduced, further reducing noise and improving the blowing efficiency. .

(Embodiment 3)
5A is a side view of a blower according to the third embodiment of the present invention, FIG. 5B is a cross-sectional view taken along the line II of FIG. 5A, and FIG. 5C is FIG. 5A is a cross-sectional view taken along line JJ in FIG. 5A, FIG. 5D is a cross-sectional view taken along line KK in FIG. 5A, and FIG. 5E is a cross-sectional view taken along line LL in FIG.

  This embodiment is different from the first embodiment in that the start of the expansion of the width of the casing 2 is started from the lower part of the casing 2, and the other configurations are the same.

  The height of the casing 2 in each of the cross sections II, JJ, KK, and LL is constant from the beginning of winding to the lower part and gradually increases from the lower part to both ends of the discharge port 2b. That is, H1> H2> H3 = H4.

  As described above, the conventional casing expands at a constant expansion rate from both ends of the casing start nose portion to both ends of the discharge port. However, in this embodiment, the blower relatively blows air from the start of winding to the lower portion. By reducing the casing area in the area where the blowout flow from the fan 1 is small, the casing can be further reduced in size without increasing noise and lowering the blowing efficiency.

  As described above, since the blower according to the present invention can reduce noise and improve the blowing efficiency, it can be applied to various devices such as an air conditioner having a centrifugal fan and a ventilator.

The perspective view of the air blower in Embodiment 1 of this invention Cross section of the main part of the blower (A) Side view of the fan, (b) AA sectional view of FIG. 3 (a), (c) BB sectional view of FIG. 3 (a), (d) C- section of FIG. 3 (a). C sectional view, (e) DD sectional view of FIG. (A) Side view of blower in embodiment 2 of the present invention, (b) EE cross-sectional view of FIG. 4 (a), (c) FF cross-sectional view of FIG. 4 (a), (d) view GG sectional view of 4 (a), (e) HH sectional view of FIG. 4 (a) (A) Side view of blower in Embodiment 3 of the present invention, (b) II sectional view of FIG. 5 (a), (c) JJ sectional view of FIG. 5 (a), (d) FIG. KK sectional view of 5 (a), (e) LL sectional view of FIG. 5 (a) A perspective view of a conventional blower Cross section of the main part of the blower

Explanation of symbols

1 Blower 2 Casing 2a Suction port 2b Discharge port 2c Winding start nose portion 2d Inclined portion

Claims (3)

A spiral casing provided with a substantially circular suction port on at least one side and a substantially rectangular discharge port on the front surface, and a blower fan provided in an air passage communicating the suction port and the discharge port A width of the casing is sequentially increased from the suction port to an arbitrary position along the wind flow direction, is made substantially constant from the arbitrary position to the discharge port, and the discharge starts from both ends of the winding start nose portion of the casing. An air blower characterized in that inclined surfaces for gradually increasing the width of the casing are formed at both ends of the outlet. The blower according to claim 1, wherein an expansion rate of the width of the casing is increased from both ends of the winding start nose portion to both ends of the discharge port. The blower according to claim 1 or 2, wherein an expansion of the width of the casing is started from a lower portion of the casing.

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