JPH06129388A - Blower - Google Patents

Abstract

PURPOSE:To provide a blower machine which presents an increased wind quantity and static pressure by improving the local air influx inside of a centrifugal fan. CONSTITUTION:A blower machine has a centrifugal fan which is equipped in the center with an impeller boss 2. where a rotary shaft 1 having a threaded part 1A at the tip is detained, and with a plurality of wane plates 4 at the periphery, and the fan is fixed by a fixing screw 6 to the threaded part 1A of the rotary shaft 1, and blades 7 are furnished on the fixing screw 6 to complete an axial flow fan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower provided with a centrifugal fan.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for an increase in air volume and static pressure in a blower provided with a centrifugal fan.

A conventional blower of this type is shown in FIG.
The description will be made with reference to FIG.

As shown in the drawing, a blade plate 10 having a wing-shaped cross section at the outer peripheral end of a circular base plate 103 connected to a blade boss 102 with which a rotary shaft 101 having a threaded portion at the tip is engaged.
4 is provided, and the other end of the vane plate 104 is fixed to the fixing ring 10.
5 is fixed to form a centrifugal fan, and the blade boss 102 of this centrifugal fan is engaged with the rotary shaft 101,
The fixing screw 106 was screwed into the screw portion provided at the end of 01 to fix the centrifugal fan.

[0005]

In the structure of such a conventional blower, when the centrifugal fan is rotated, a pressure difference occurs between the back surface and the inner surface of the vane plate 104 having a blade-shaped cross section,
The pressure gradient causes air to flow into the centrifugal fan. At this time, since the inflowing air enters in parallel to the axial direction, the inflowing air is locally sucked by the upper blade plate 104A, while the inflowing air becomes thin in the lower blade plate 104B.

Therefore, the blade plate upper portion 104A as a whole
The airtightness of the air blower determines the performance of the blower, and there is a problem that the air volume and static pressure cannot be increased.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a blower capable of improving local air inflow inside a centrifugal fan and increasing air volume and static pressure.

[0008]

In order to achieve the above-mentioned object, the blower of the present invention has a blade boss in the central portion which engages with a rotary shaft having a threaded portion at the tip, and a plurality of blade bosses are provided in the vicinity of the outer peripheral portion. A centrifugal fan provided with a blade plate and a fixing screw that is screwed into a screw portion of the rotating shaft to fix the centrifugal fan are provided, and blades are provided on the fixing screw to form an axial fan. .

[0009]

According to the present invention, since the axial fan is provided inside the centrifugal fan according to the above-mentioned structure, the air flow induced by the axial fan also flows to the inner side of the centrifugal fan. An airflow is generated over the entire length of the vane plate, and the air volume and static pressure are increased.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to.

As shown in the figure, a blade plate 4 having a wing-shaped cross section is provided in the vicinity of the outer periphery of a circular base plate 3 having a blade boss 2 at the center for engaging a rotary shaft 1 having a threaded portion 1A at the tip. It is arranged in the circumferential direction, the other end of the vane plate 4 is fixed by a fixing ring 5 to form a centrifugal fan, and the centrifugal fan is screwed into the threaded portion 1A of the rotating shaft 1 engaged with the centrifugal fan. A plurality of blades 7 are arranged on the fixing screw 6 for fixing the centrifugal fan with the blade tip 7A inclined toward the suction side in the axial direction to form an axial fan shape.

In the above structure, when the centrifugal fan is fixed to the rotary shaft 1 with the fixing screw 6 having the shape of the axial fan and is rotated, the inflowing air is fixed to the upper ring 4A of the blade plate as in the known centrifugal fan. It flows in from inside 5 and flows to the outside of the vane plate 4 by centrifugal force. At this time, the fixing screw 6 also rotates at the same time, the blade 7 provided on the fixing screw 6 forms an axial fan, and the air flowing from the inside of the fixing ring 5 is sent to the substrate 3 side to be the blade plate on the substrate 3 side. Air is also attracted to the lower side 4B, and an air flow is generated over the entire length of the vane plate 4, and as shown in FIG. 3, both the air volume and the static pressure increase compared with the conventional product.

[0013]

As is apparent from the above embodiments, according to the present invention, a blade boss having a threaded portion at the tip for engaging with a rotary shaft is provided in the central portion, and a plurality of blade plates are provided in the vicinity of the outer peripheral portion. A centrifugal fan provided with a fixing screw for fixing the centrifugal fan by screwing with a screw portion of the rotating shaft, and a blade is provided on the fixing screw to form an axial fan. A fixing screw that fixes the force fan serves as an axial fan, and an airflow is attracted to the inner side of the centrifugal fan to provide a blower that can increase the air volume and static pressure.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a blower according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an inflowing air state of the blower.

[Fig. 3] Characteristic diagram of air volume and static pressure of the blower

FIG. 4 is an exploded perspective view of a conventional blower.

FIG. 5 is a sectional view showing an inflowing air state of the blower.

[Explanation of symbols]

 1 rotating shaft 1A screw part 2 blade boss 4 blade plate 6 fixing screw 7 blade

Claims (1)

[Claims] 1. A centrifugal fan having a vane boss in the center, which engages with a rotary shaft having a threaded portion at its tip, and a plurality of vane plates provided in the vicinity of the outer peripheral portion, and a threaded portion of the rotary shaft. A blower comprising a fixing screw that is screwed to fix the centrifugal fan, and blades are provided on the fixing screw to form an axial fan.