JP2006017037A - Impeller of multiblade fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impeller of a multiblade fan in which improvement in vane efficiency and increase in the performance-life can be achieved. <P>SOLUTION: The impeller 1 includes a number of curved vanes 2 having uniform thickness. Each vane 2 is curvedly retreated in the rotation direction to be caulked to a main plate 3 and a side plate 4. A plurality of auxiliary vanes 5, which retreat curvedly in the rotation direction, are provided radially at the same intervals away from the vanes 2 in the center of the main plate 3. The vanes 2 and the auxiliary vanes 5 are curved nearly in the same shape so as to create well balanced swirl airflow. One side of each auxiliary vane 5 provided in the inside is fixed to the outside periphery of a boss part 6 provided in the main plate 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an impeller of a multi-blade fan for air conditioning, which is called a sirocco fan.

  As a multiblade blower (centrifugal blower) designed to reduce noise and improve fan efficiency, an inducer is connected to the inside of the blades, or the front half of each blade is bulged on the negative pressure side. Some pressure side is curved. In addition, there exist the technique disclosed by patent document 1 and patent document 2 as a prior art about this kind of multiblade fan.

JP 2002-70793 A JP 2002-285996 A

  In general, a multiblade blower performs pressure increase that is hydrodynamically considerable due to the structure of the impeller, so that the efficiency is low and the noise is high. For this reason, reduction of noise and improvement of fan efficiency are often problems as in Patent Documents 1 and 2. In addition, there is a strong demand for downsizing air-conditioning multi-blade fans such as ventilators. One of the factors that determine the main body size of a multiblade fan is the shape of the impeller. Although downsizing is possible by shortening the blade width of the impeller, there is a problem that the blade efficiency is deteriorated. If it is attempted to cover with the electric motor as much as the blade efficiency has deteriorated, the electric motor becomes large, and as a result, the size of the multiblade fan does not become small.

  Moreover, compared with the impeller of an axial-flow fan, the impeller of a multiblade fan tends to adhere dust, and ventilation performance deteriorates by adhesion of dust. In conventional multi-blade fans designed to reduce noise and improve fan efficiency, the distance between the contact surface and the airflow is long due to the inducer, and dust is easily attached. In both cases, the performance life of the blade due to the adhesion of dust is shortened.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to obtain an impeller of a multiblade fan capable of improving blade efficiency and extending the life of performance. Therefore, it is to obtain an impeller of a multiblade fan that can promote downsizing of the multiblade fan.

  In order to solve the above-mentioned problems, the present invention relates to an impeller of a multiblade blower having a large number of curved blades of equal thickness, and recedes by curving in the rotational direction at the center of a main plate for mounting on a rotating shaft. A means for providing a plurality of auxiliary wings radially away from the blades at equal intervals is employed.

  According to the present invention, since the swirl flow by the auxiliary blade is formed and guided to the blade suction side, the blade efficiency is good and the air volume is increased. The blades are of uniform thickness, and dust is attached to the auxiliary wings that are easy to clean, but they are difficult to adhere to the blades, and the reduction in performance life due to clogging can be improved. As a result, even if the blade width is reduced, the blade efficiency is improved by the auxiliary blades, so that the size of the multiblade fan can be reduced.

  The impeller of the multiblade fan of the present invention has a large number of curved blades of equal thickness. In the center of the main plate perpendicular to the rotating shaft for attaching the impeller to the rotating shaft, a plurality of auxiliary blades that are curved and retracted in the rotating direction are provided radially away from the blades at equal intervals. One side of the auxiliary wing is fixed to the outer periphery of a boss portion provided on the main plate.

  According to this impeller, since a swirl flow is formed by the auxiliary blades and guided to the suction side of the blades, the blade efficiency is good and the air volume is increased. The blades are of uniform thickness, and dust is attached to the auxiliary wings that are easy to clean, but they are difficult to adhere to the blades, and the reduction in performance life due to clogging can be improved. As a result, since the blade efficiency is improved by the auxiliary blade even if the blade width is reduced, the multiblade fan can be downsized. Further, since the boss portion is reinforced by the auxiliary wing, the thickness of the boss portion can be reduced correspondingly and the weight can be reduced.

Embodiment 1 FIG.
FIG. 1 is a front view of an impeller of a multiblade fan according to the present embodiment, FIG. 2 is a side sectional view of the impeller, and FIG. 3 is a side sectional view of another impeller. This multiblade blower is used for a ventilator or the like, and its impeller 1 has a large number of curved blades 2 of equal thickness as shown in FIG. The curvature of the blade 2 is retreated in the rotational direction (the direction of the broken line arrow in FIG. 1) and is caulked to the main plate 3 and the side plate 4. The main plate 3 attaches the impeller 1 to the rotating shaft, and therefore is perpendicular to the rotating shaft. In the center of the main plate 3, a plurality of auxiliary blades 5 curved and retracted in the rotational direction are radially spaced at equal intervals. 2 is provided apart. The curved shape of the blades 2 and the curved shape of the auxiliary wings 5 are substantially the same, and a well-balanced swirling airflow can be created. One side inside the auxiliary wing 5 is fixed to the outer periphery of the boss portion 6 provided on the main plate 3. The impeller 1 in FIGS. 1 and 2 is a double-suction type, and in order to reduce the size, an auxiliary wing 5 is provided only on one side, and an electric motor is inserted on the side without the auxiliary wing 5. Thus, the auxiliary wings 5 may be provided on both sides.

  According to this impeller 1, since the swirling flow by the auxiliary blade 5 is formed in a substantially S shape as indicated by the solid line arrow in FIG. 1 and is guided and pushed out to the suction side of the blade 2, the blade efficiency is good and the air volume is high. Increase. The blades 2 have a uniform thickness, and dust is attached to the auxiliary blades 5 that are easy to clean, but hardly adhere to the blades 2, so that a reduction in performance life due to clogging can be improved. As a result, even if the blade width is reduced, the blade efficiency is improved by the auxiliary blade 5, so that the size of the multiblade fan can be reduced. Moreover, since the boss | hub part 6 is reinforced by the auxiliary wing 5, the thickness of the boss | hub part 6 can be made correspondingly thin, and weight reduction can also be aimed at.

It is a front view of an impeller. (Embodiment 1) It is a sectional side view of an impeller. (Embodiment 1) It is a sectional side view of another impeller. (Embodiment 1)

Explanation of symbols

  1 impeller, 2 blades, 3 main plate, 5 auxiliary wings, 6 boss part.

Claims (3)

  An impeller of a multiblade fan having a large number of curved blades of equal thickness, and a plurality of auxiliary blades that are curved and retracted in the rotational direction are radially spaced at the center of the main plate for mounting on the rotating shaft. An impeller of a multi-blade fan provided away from the blade.   The impeller of the multiblade fan according to claim 1, wherein one side of the auxiliary blade is fixed to the boss portion of the main plate.   The impeller of the multiblade fan according to claim 1 or 2, wherein the curved shape of the blade and the curved shape of the auxiliary blade are substantially the same.

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