JPS595800B2 - Centripetal fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Contrary to a normal centrifugal fan, a conventional centripetal fan draws airflow from the outside in the radial direction through the impeller to the inside.
As shown in Figures 2 and 3, there is a blade wheel main shaft a and a rotating blade support rotary plate fixed to one end of the main shaft a. a fan casing d disposed opposite to the rotor blade C via the rotor blade C; and a fan casing d positioned closer to the center than the rotor blade C and attached to the fan casing d. By rotating the blade wheel main shaft a1 rotor blade support rotating plate and rotor blade C in the counterclockwise direction (in the direction of the white arrow) in Fig. 1, the airflow is directed in the radial direction. The airflow is sucked in from the outside toward the center as shown by the black arrow, and the sucked airflow is given a swirl by the rotor blades, and the airflow is given a swirl by the exit guide blade e.
This rotation is substantially eliminated, and the fluid is discharged through the central discharge port f of the casing d.

However, in such a centripetal fan, the exit guide vane e
Therefore, if the swirling of the airflow is not removed, the airflow will obtain a force directed outward in the radial direction due to centrifugal force due to the swirling, and even though the rotor blades C are rotating, no flow may occur.

Therefore, it is difficult to accurately arrange the outlet guide vanes e as described above in a small, simple-structured fan used in an air conditioner or the like, and an increase in cost is unavoidable.

The present invention relates to an improvement of a centripetal fan that overcomes these difficulties, and is characterized in that an axial fan blade is attached to the inner opening of the end plate of the centripetal rotor blade without having an outlet guide vane. The purpose is to provide a centripetal fan with simple structure and excellent performance.

As described above, the present invention has an axial fan blade attached to the inner opening of the end plate of the centripetal rotor blade without having an outlet guide vane, so that when the centripetal rotor blade is rotated, the centripetal rotor blade causes Airflow is sucked from the outside toward the center, and the air collected at the center is sucked out in the axial direction from the inner opening by the axial fan blades that rotate together with the centripetal rotor blades. .

In this way, in the present invention, there is no need to provide a separately fixed outlet guide vane near the rotation center of the centripetal rotor blade, and the axial fan can be installed integrally with the centripetal rotor blade at its inner opening. This simplifies the casing, simplifies the overall structure of the centripetal fan, and significantly reduces costs.

Furthermore, in the present invention, the centripetal rotor blades are fixed not only to one rotating plate of the rotor, but also to the other end plate, resulting in significantly high rigidity and strength, and improved durability.

The present invention will be described below with reference to the embodiment shown in FIGS. 3 and 4. Reference numeral 1 denotes a blade wheel main shaft, and a rotating blade support rotary plate 2 is integrally fixed to the shaft end of the main shaft 1. Centripetal rotor blades 3 are integrally attached to the outer periphery of the rotor at regular intervals in the circumferential direction.

Further, a rotor blade support end plate 4 is integrally fixed to the centripetal rotor blade 3 facing the rotor blade support rotary plate 2, and an axial flow fan is installed in the center opening 5 of the end plate 4 at equal intervals in the circumferential direction. The blades 6 are integrally attached, and the inner edges of the axial fan blades 6 are integrally fixed to each other at a boss portion 7.

Since the embodiment shown in FIGS. 3 and 4 is configured as described above, when the blade wheel main shaft 1 is rotated, the rotor blade support rotating plate 2, the centripetal rotor blade 3, the rotor blade support end plate 4. The axial fan blades 6 and the boss portion 7 also rotate together, and the flow sucked in by the centripetal rotor blades 3 is sucked out by the action of the axial fan blades 6.

In addition, since the airflow is pressurized in two stages, the centripetal rotor blades 3 and the axial fan blades 6, the pressure rise is large, and in addition, the characteristics suitable for the large air volume of the centripetal fan are maintained, resulting in large air volume and high pressure. Become a suitable fan.

In other words, it is possible to use a smaller fan for a given specification.

Furthermore, in the embodiment, since there is no need to provide a separate (F) outlet guide vane near the center of the centripetal rotor blade 3, the shape of the casing is significantly simplified, and the structure of the centripetal fan as a whole is also simplified. Costs will drop dramatically.

Furthermore, the axial fan blade 6 can be molded integrally with the rotor blade support end plate 4, and since the end plate 4 is indispensable for holding the centripetal rotor blade 3, the cost is reduced. Although the present invention has been described with reference to four embodiments, which are not expensive, the present invention is of course not limited to these embodiments, and various modifications may be made without departing from the spirit of the invention. The design can be modified.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of a conventional centripetal fan, and Figure 2 is a vertical side view of a conventional centripetal fan.
FIG. 3 is a vertical cross-sectional side view illustrating an embodiment of the centripetal fan according to the present invention, and FIG. 4 is a plan view thereof. DESCRIPTION OF SYMBOLS 1...Blade wheel main shaft, 2...Rotating blade support rotating plate, 3...Centripetal moving blade, 4...Roving blade support end plate, 5... ... Center opening, 6 ... Axial fan blade, 7 ... Boss part.

Claims (1)

[Claims] 1. A centripetal fan characterized by having axial flow fan blades attached to the inner opening of the end plate of the centripetal rotor blade without having an outlet guide vane.