JPH05998U - Multi-winged Juan - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a centrifugal double-suction multi-blade fan used in a blower such as an air conditioner, which realizes a smooth flow of air on the suction side and improves aerodynamic performance. The purpose of the present invention is to provide a multi-blade fan with low noise and low noise. [Structure] A disk-shaped main plate 11, a large number of blades 12 fixed on both sides of the outer peripheral portion of the main plate, and a conical shape in which the bottom surface is closely fitted to concentric projections 19 provided on both sides of the main plate. The air guider 18 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centrifugal multi-blade fan used for a blower such as an air conditioner.

[0002]

[Prior Art]

 Recent centrifugal multi-blade fans used for blowers such as air conditioners are required to be small in size, high in performance, and low in noise in order to reduce the size and noise of air conditioners.

As a conventional multi-blade fan, there is one disclosed in Japanese Utility Model Laid-Open No. Sho 62-0888214.

An example of the conventional multi-blade fan described above will be described below with reference to the drawings. FIG. 3 shows a cross-sectional view of a conventional multi-blade fan in the rotation axis direction.

In FIG. 3, reference numeral 1 denotes a main plate, which is made of a disc-shaped resin. Reference numeral 2 denotes a blade, which is integrally formed on both sides of the outer peripheral portion of the main plate 1. Reference numeral 3 denotes a rotation axis, which is orthogonal to the main plate 1. Reference numeral 4 denotes a boss, which is insert-molded on the main plate 1 and screwed and fixed to the shaft 5.

Reference numeral 6 denotes a suction side, which is a space surrounded by the main plate 1 and the blade 2, and 7 denotes a blowing side, which is an outer peripheral side space of the blade 2. Reference numeral 8 denotes a casing, which covers the periphery of the blade 1 and is open only at the portions facing the suction side 6 and the blowing side 7. Reference numeral 9 is an air flow, and 10 is an eddy.

The operation of the multi-blade fan configured as described above will be described below with reference to FIG.

First, when the shaft 5 rotates, the main plate 1 rotates via the boss 4. Next, air is sucked in from the suction sides 6 on both sides of the main plate 1 and blown out from the blowing side 7. The air blown out around the outer periphery of the main plate 1 afterward is collected by the casing 8 and blown out in one direction.

[0009]

[Problems to be solved by the device]

 However, in the above-mentioned configuration, the air flowing from the suction side 6 collides with the main plate 1, so that the eddy 10 is generated. For this reason, the aerodynamic performance of the fan is deteriorated and the noise due to eddies is generated.

In view of the above problems, the present invention provides a double-suction multi-blade fan that realizes a smooth flow of air, has good aerodynamic performance, and has low noise.

[0011]

[Means for Solving the Problems]

 In order to solve the above problems, the multi-blade fan of the present invention has a disk-shaped main plate, a large number of blades fixed to both outer peripheral portions of the main plate, and concentric circular projections provided on both sides of the main plate with bottom surfaces. Cone-shaped air guiders, which are fitted so as to closely contact each other, are provided on both sides of the main plate.

[0012]

[Action]

 With the configuration described above, the present invention allows the air flow from the suction side to be guided along the air guider without colliding with the main plate, so that no eddies are generated, aerodynamic performance is improved, and noise is reduced. it can.

[0013]

【Example】

 A multi-blade fan according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a multi-blade fan according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the axis of rotation in which the casing is added to FIG.

In FIG. 1, 11 is a main plate, which is made of disc-shaped resin. Reference numeral 12 denotes a blade, which is integrally formed on both sides of the outer peripheral portion of the main plate 11. A rotation axis 13 is orthogonal to the main plate 11. Reference numeral 14 denotes a boss, which is insert-molded on the main plate 11 and fixed to the shaft 15 with screws. Reference numeral 16 denotes a suction side, which is a space surrounded by the main plate 11 and the blade 12, and 17 denotes a blowing side, which is an outer peripheral side space of the main plate 11.

Reference numeral 18 denotes an air guider, which is made of rubber having a conical shape in which the bottom surface is in close contact with the main plate 12 side and is provided on both surfaces of the main plate 11. Reference numeral 19 denotes a protrusion, which is integrally formed on both surfaces of the main plate in a concentric shape. Reference numeral 20 denotes a casing, which covers the periphery of the blade 12 and is open only where it faces the suction side 16 and the blowing side 17. Reference numeral 21 indicates the flow of air.

The operation of the multi-blade fan configured as described above will be described below with reference to FIGS. 1 and 2.

First, when the shaft 15 rotates, the main plate 11 rotates via the boss 14. Next, air is sucked in from the suction side 16 and blown out along the air guider 18 from the blowing side 17. Finally, the air blown around the outer circumference of the blade 11 is collected by the casing 20 and blown in one direction.

As described above, the flow of air entering from the suction side does not collide with the main plate 11 and does not generate eddies, so that aerodynamic performance can be improved and noise can be reduced.

[0020]

[Effect of the device]

 As described above, according to the present invention, a disk-shaped main plate, a large number of blades fixed to both outer peripheral portions of the main plate, and a bottom surface closely attached to concentric circular projections provided on both sides of the main plate are externally attached. A double suction multi-blade fan with conical air guiders on both sides of the main plate prevents air flow from the suction side from colliding with the main plate and generating eddies, improving aerodynamic performance. In addition, it can reduce noise and contribute to the realization of a small and low noise air conditioner.

[Brief description of drawings]

FIG. 1 is a perspective view of a multi-blade fan according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the axis of rotation of the multi-blade fan of the embodiment with a casing added.

FIG. 3 is a cross-sectional view of a conventional multi-blade fan in the rotation axis direction.

[Explanation of symbols]

 11 main plate 12 blade 18 air guider 19 protrusion

Claims (1)

[Claims for utility model registration] [Claim 1] A disk-shaped main plate, a large number of blades fixed to both sides of the outer periphery of the main plate, and a bottom surface closely contacting concentric circular protrusions provided on both sides of the main plate. A double-suction multi-blade fan consisting of a conical air guider that is extrapolated to