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[0001] 1. Field of the Invention
[0002] The present invention relates to a centrifugal fan which sucks air in the axial direction of a rotary shaft and blows it out in the radial direction. This centrifugal fan is effectively applied to an air purifier for vehicle use or an air-conditioner recessed in a ceiling.
[0003] 2. Description of the Related Art
[0004] A centrifugal fan, which will be referred to as a fan in this specification hereinafter, which is described in Japanese Unexamined Utility Model Publication No. 61-29222, is composed as follows. Outside a centrifugal multi-blade impeller, which will be referred to as an impeller in this specification hereinafter, there are provided two air passages which are formed into a spiral. Due to the above structure, air streams can be simultaneously blown out from a plurality of outlets.
[0005] However, in the case of the above fan having a plurality of outlets, the length of the air passage (the winding angle of the air passage) is shorter than that of a fan having one outlet. Therefore, the following problems may be encountered. The air stream in the fan is unstable, and turbulence tends to occur in the air stream. For the above reasons, noise tends to be generated, and further the total pressure of the fan can not be sufficiently increased.
[0006] The present invention has been achieved to solve the above problems. It is an object of the present invention to decrease the occurrence of noise and increase the total pressure of a fan having a plurality of outlets.
[0007] In order to accomplish the above object, the present invention provides a centrifugal fan comprising: a centrifugal impeller (
[0008] Due to the above structure, while a stream of air blown out from the centrifugal impeller (
[0009] In this connection, it is preferable that the stator blades (
[0010] It is also preferable that the centrifugal impeller (
[0011] It is also preferable that the entrance angle (α) of the stator blade (
[0012] Further, it is preferable that the cross-section of the stator blade (
[0013] In this connection, reference numerals in parentheses in each means described above show the correspondence to the specific means described in the embodiments which will be stated later.
[0014] The present invention may be more fully understood from the description of preferred embodiments of the invention set forth below, together with the accompanying drawings.
[0015] In the drawings:
[0016]
[0017]
[0018]
[0019]
[0020]
[0021]
[0022]
[0023]
[0024] In this embodiment, a fan of the present invention is applied to an air purifier, for vehicle use, by which air in a passenger compartment of a vehicle is cleaned.
[0025] In this embodiment, the air purifier
[0026] Next, the fan
[0027]
[0028] In this connection, the delivery angle β of each blade
[0029] As shown in
[0030] In each outlet
[0031] In the casing
[0032] In this connection, reference numeral
[0033] Reference numeral
[0034] Next, the characteristic of this embodiment will be described below.
[0035] Immediately after air has been blown out from the impeller
[0036] On the other hand, in this embodiment, on the outer diameter side of the impeller
[0037] Consequently, it is possible to make the current of air flow stably into the outlet
[0038] After the current of air has been straightened by the diffusers
[0039] In this connection,
[0040] In this connection, the definition of terminology of total pressure ΔP and specific noise Ks is based on JIS B 0132, and the above method of the experiment is based on JIS B 8340.
[0041] In this connection, as shown in
[0042] In this embodiment, an impeller (turbo-impeller), the blades of which are arranged backward, the delivery angle β of each blade
[0043] Another embodiment will be explained below. In the embodiment described above, the number of the outlets
[0044] In the above embodiment, the fan of the present invention is applied to an air purifier for vehicle use, however, it should be noted that the present invention is not limited to the above specific embodiment. The fan of the present invention can be applied to an air-conditioner recessed in a ceiling or to another apparatus.
[0045] In the above embodiment, the impeller is used, the blades of which are arranged backward and the impeller delivery angle β of which is not less than 90°. However, it possible to use an impeller, the blades of which are arranged forward and the impeller delivery angle β of which is not more than 90°.
[0046] In the above embodiment, the diffusers
[0047] In the above embodiment, the each diffuser
[0048] While the invention has been described by reference to specific embodiments chosen for purposes of illustration, it should be apparent that numerous modifications could be made thereto by those skilled in the art without departing from the basic concept and scope of the invention.