JPH0580596B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a centrifugal blower used in air conditioning equipment, etc., and relates to a blower that uses one centrifugal blower to emit airflow in multiple directions. This is related.

BACKGROUND ART Conventionally, when a single centrifugal blower is used to discharge airflow in multiple directions, a storage section 2 is provided in the middle of a casing 1, as shown in FIG. an air supply port 5 is formed in one end surface of the storage section 2, and an air supply port 5 is formed in one end surface of the storage section 2;
Furthermore, a blower B was configured by storing one centrifugal impeller 6 inside the storage part 2.
(For example, Japanese Utility Model Application No. 54-70108) Note that this impeller 6 is driven by an electric motor (not shown), and solid arrows in FIG. 5 indicate air flow.

That is, in the above configuration, the centrifugal impeller 6
After air is sucked into the casing 1 from the air supply port 5 by the rotation of the casing 1, an air flow is simultaneously discharged to the outside of the casing 1 from both the discharge ports 3 and 4.

Problems to be Solved by the Invention However, in the above configuration, in order to drive one centrifugal impeller 6 within the casing 1 having a plurality of discharge ports 3 and 4, discharge from each discharge port 3 and 4 is The air flow rates will be divided into 1/2 of each other. Therefore, in order to increase the air volume of the blower, it is necessary to increase the length of the impeller in the axial direction. The problem was that the air flow to the impeller deteriorated and the blowing efficiency of the impeller decreased.

The present invention solves such conventional problems by making the air supply port of the blower only in one direction, and increasing the length of the impeller in the axial direction without reducing the air blowing efficiency of the impeller. The purpose is to enable an increase in air volume.

Means for Solving the Problems In order to solve the above problems, the centrifugal blower of the present invention has a plurality of casings each having a common air supply port and independent discharge ports, and an axial air blower fixed to the rotor of the same motor. It is composed of a centrifugal impeller and two centrifugal impellers, and the axial impeller is provided between both centrifugal impellers, and the upstream centrifugal impeller is passed from the upstream centrifugal impeller to the axial impeller. The respective impellers are arranged so that air flows into the centrifugal impeller on the upstream side, and the suction port of the centrifugal impeller on the upstream side is arranged to face the air supply port.

Effects The present invention has the above-described configuration so that the air supply port of the blower is only unidirectional, and air is forcibly supplied to the downstream impeller by the axial flow impeller. By increasing the length of the impeller in the axial direction without reducing the air blowing efficiency of the impeller, the amount of air blown can be increased, and at the same time, the air can be discharged in two directions.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

Examples are shown in FIGS. 1 to 4. Figure 2 is the first
3 shows the bb section in FIG. 1, and FIG. 4 shows the cc section in FIG. 1. As shown in FIGS. 1 to 4, the centrifugal blower A of the present invention includes two centrifugal impellers 22 and 23.
, two corresponding casings 24 and 25 and an axial flow type impeller 21 are provided, and two centrifugal type impellers 22 and 23 are provided so that the inflow direction of air flow to both impellers is the same direction. The axial flow type impeller 21 is arranged between both impellers 22 and 23.
are provided, and both impellers 22 and 23 rotate simultaneously, so that airflow flows from the upstream impeller 22 to the downstream impeller 23 via the axial flow type impeller 21. It is equipped with an impeller. Furthermore, the discharge ports 26 and 27 of the casings 24 and 26 are provided independently, and the discharge ports 26 and 27 of the casings 24 and 26 are provided side by side with a current plate 35 interposed therebetween.
Inside, the intake port 29 of the centrifugal impeller 22 on the upstream side is arranged to face the air supply port 34, and an outrotor type electric motor 31 is arranged, and the impeller 2 on the downstream side
The main plate 27 of No. 3 is fixed to the rotor 32 of an electric motor 31 so that the impellers 22, 23 and 21 rotate about the same rotation axis. Further, the entire casing 30 consisting of the casings 24 and 25 has a rectifying plate 3
It is constructed by installing the two together through the 5. On the other hand, by fixing the stator 33 of the electric motor 31 to the casing 25, the electric motor 31 can be attached to the casing 25.
5, and an air supply port 34 common to the casings 24 and 25 is provided at a position in the casing 24 facing the suction port 29 provided in the sub-plate 28 of the impeller 22 on the upstream side. In addition, in the figure, solid line arrows indicate the flow of air flowing through the impeller 22 on the upstream side. Moreover, the broken line arrow indicates the flow of air flowing through the impeller 23 on the upstream side.

In the above configuration, the axial flow impeller 21 is provided between the upstream impeller 22 and the downstream impeller 23, and these impellers 22, 23, and 24 rotate simultaneously to open the air supply port of the casing 24. The air flow indicated by the solid line arrow supplied from 33 is directed to the discharge port 2 of the casing 24 by the centrifugal force of the impeller 22 on the downstream side.
After the air flow (dashed line arrow) flows into the impeller 23 on the downstream side via the axial flow impeller 21 and flows into the casing 25
A flow toward the discharge port 27 is formed. Therefore, since the air flow flowing into the downstream impeller 23 is forcibly blown by the axial flow type impeller 21, the air flow flowing into the downstream impeller 23 is forcibly blown by the axial flow type impeller 21. Air can be sent to. That is, there is an effect that the length of the impeller in the axial direction can be increased without reducing the efficiency of the impeller. Furthermore, by providing a rectifying plate 35 protruding from the casing 30 in the direction of the axial flow impeller 21 so as to have a gap 36 between the axial flow impeller 21 and the outer circumference of the axial flow impeller 21. When the length in the axial direction becomes longer, at the outer periphery of the axial impeller 21,
This has the effect of preventing flow disturbances caused by mutual interference between the upstream impeller 22 and the downstream impeller 23.

Effects of the Invention As described above, the centrifugal blower of the present invention provides the following effects.

(1) Since the axial flow impeller is installed between the upstream centrifugal impeller and the downstream centrifugal impeller, the downstream centrifugal impeller also has the function of the axial flow impeller. A sufficient amount of air can be supplied.

(2) Since the air supply port of the blower can be installed in only one direction and the length of the impeller in the axial direction can be increased, a large air volume can be achieved, and the air path of the equipment can be easily designed. .

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a centrifugal blower showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line a-a in Fig.
The figure is a sectional view taken along line b-b in Figure 1, and Figure 4 is a cross-sectional view in Figure 1 c.
-c sectional view is shown, and FIG. 5 is a sectional view of a conventional centrifugal blower. 21... Axial flow impeller, 22... Upstream centrifugal impeller, 23... Downstream centrifugal impeller, 24,2
5, 30... Casing, 26, 27... Discharge port, 31... Electric motor, 34... Air supply port, 35...
Current plate, 36... gap.

Claims (1)

[Claims] 1 Consists of multiple casings having a common air supply port and independent discharge ports, an axial impeller and two centrifugal impellers fixed to the rotor of the same motor, and a space between the centrifugal impellers. The axial flow type impeller is provided in the upstream side, and the respective impellers are arranged so that the air flow flows from the upstream centrifugal type impeller to the upstream side centrifugal type impeller via the axial flow type impeller. A centrifugal blower in which a suction port of an upstream centrifugal impeller is arranged opposite to the air supply port.