JPS611893A - Annular blower - Google Patents

Abstract

PURPOSE:To enable an annular single body blower to have the interior independently divided into I and II stages by providing a central partition casing as a common one for I and II stages and disposing an impeller and outside casing on both sides of the partition casing. CONSTITUTION:On both sides of a central partition casing 16 as common one for I and II stages are disposed impellers 12, 13 and outside casings 14, 15 so that respective independent annular blower sections are formed by dividing the interior of a single body constituted annular blower section into I and II stages. Thus, compared with prior annular blower sections arranged in 2 parallel stages to provide a pair of casings on each stage and constituted into a both side groove system, the simple and compact construction is provided. Also, since the outside casings 14, 15 are constituted with the same configuration, they can be casted with the same mold. Thus, high blowing pressure can be obtained still with such compact construction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] This invention relates to a two-stage annular blower that can be easily converted into series or parallel.

[Prior art and its problems] The structure and operation of a conventionally known one-stage annular blower will be explained with reference to FIGS. 1 to 3. The annular blower is as follows.

Broadly divided into the illustrated electric motor section 1, blower section 2, and silencer.
3, which are combined and connected to each other.

The blower section 2 consists of an impeller 4, a casing 5 surrounding the impeller 4, and a casing cover 6. The impeller 4 has a central boss supported by the motor rotating shaft 7, and a large number of blades 4a are arranged on the circumference of the impeller 4. At the base of the blade 4a, a convex cross-sectional portion 4i is formed which is raised from the center t. hand,
The blade 4a has a double blade shape. The casing 5 and the casing cover 6 form side grooves 8 as air guide paths along both sides of the blade 4a. In other words, asymmetrical grooves on both sides are formed which act on external pressure together with the impeller.

The suction port 9 and the discharge port 10 are arranged to open close to each other on the side gutter 8, and especially in the area t between the suction port 9 and the discharge port 1o, high-pressure air on the discharge port Io side flows back toward the suction port 9 side. In order to prevent this, a partition structure is adopted in which a partition wall 11 is formed with almost no gap between the blade 4a, the casing 5, and the casing cover 6. Similarly, there is no gap between the side surface of the impeller 4 and the casing.The suction port 9 and the discharge port 10 have external piping connected thereto for convenience. Silencer 3 with discharge pipe joints arranged side by side
is connected. A sound deadening material 3a is provided inside the muffler 3.

The blowing theory of the annular blower with the above structure is already well known, but to briefly explain, the air introduced from the suction port 9 is caused by centrifugal force on each of the blades 4a, as indicated by the arrow C in Fig. 2. This flow is triggered and pressure rises in the grooves on both sides, and as this airflow is repeated many times from the suction port 9 to the discharge port 10 along arrow B between both sides #8 and vane $4a, the pressure gradually increases. increases, reaching the discharge port 10 and generating high static pressure. That is, the air flow advances along the inside of the grooves 8 on both sides in the casing 5 in a symmetrical double spiral shape.

Such an annular blower can achieve high blowing pressure with a relatively small amount of airflow, and is used for a variety of purposes.

However, in order to obtain higher blowing pressure due to the demands of the pneumatic load side, etc., the annular blower section 2 consisting of a pair of casings 5 and 6 and an impeller 4 having both blades as shown in FIG. A plurality of stages are installed on the casing 7, and the discharge port of the previous stage is connected in series to the suction port of the latter stage in each stage of the casing, forming a multistage annular blower. However, this method requires a pair of independent casings surrounding the impeller to be provided for each stage, resulting in large dimensions and high manufacturing costs.

I-Object of the Invention] This invention is a single independently constructed annular blower section that is easy to manufacture and has a simple structure, which can provide a high blowing pressure comparable to that of a conventional two-stage annular blower, and which can be used as needed. The purpose is to provide an annular blower that can also be connected in parallel.

[Key points of the invention]

In order to achieve the above object, the present invention has an annular blower comprising an impeller having a large number of blades arranged upright on the circumferential surface on only one side in the axial direction, and a casing having a side groove facing the blades. , a flat partition casing located in the center, a pair of identical impellers arranged back to back on both sides of the partition casing, and a pair of outer casings facing the pair of impellers. A stage annular blower section is formed, and each of the outer casings ζ is configured to have a discharge port and a suction port corresponding to a series connection or a parallel connection.

[Embodiments of the invention]

Embodiments of the invention will be described with reference to the drawings. In Fig. 4, reference numeral 12.13 has a shape similar to that of the impeller 4 in Fig. 2 divided into two at the center, and has a pair of identical single blades arranged back to back. has a large number of blades 123, 133 arranged upright. Both impellers 12, 13 are mounted side by side on the drive motor rotating shaft 7. Outer casing 14° 15 forming a gutter 8 on one side for the blades 1, 2a, 13M of each impeller 12.13
are located outside the assembly of said impellers 12,13. Furthermore, a flat partition casing 16 is provided which is interposed between the outer casings 14, 15 and located between the pair of impellers 12, 13.

With such an assembly configuration, the partition casing 16 is shared, and on both sides thereof, the impeller 12 and the outer casing 14, and the impeller 13 and the outer casing 15 each have a divided annular shape with I and II stages each having an independent pressure boosting action. A blower section is formed separately within the outer casing 12-13.

The series connection and parallel connection of the divided annular blower sections of each stage I and (2) will be explained. First, they are connected in series with each other as follows.

That is, as shown in the schematic development view of FIG. 5, the outer casing 14 has a suction port 9, the outer casing 15 has a discharge port 10, and the partition casing 16 has a connecting port 17 that serves both as a suction port and a discharge port.
is drilled.

Since the outer casings 14 and 15 have the same shape and can be used by turning one of them in the opposite direction, they can be cast in the same mold. At this time, while the outer casing is used by changing its direction, the impeller rotates in the same direction.
The shape of the side gutter is the same from the inlet to the outlet as from the outlet to the inlet. With respect to the suction port 9, the connection port 17 and the discharge port 10 are sequentially arranged so as to be shifted by an angle of 0 minutes apart from the partition wall portion 11. Therefore, the gas introduced from the suction port 9 connected to the external suction pipe is pressurized in the one-stage annular blower section, then introduced into the membrane blower through the connecting port 17, and further pressurized at the discharge port. 10, it is sent out to the external discharge pipe, and high blowing pressure can be obtained. As shown in FIG. 4, the outer casing 15 has a connecting portion to the electric motor, so the connecting portion exists even though the outer casing 141 is not used. This part has the same gun shape and does not need to be machined for joining, or it can be machined and used as a common part.

FIG. 6 shows another embodiment of series connection, in which the partition casing 16
is not provided with a connection port, but the outer casing 14
．． A suction port 9 and a discharge port 10 are bored in each of the holes 15, sandwiching the partition wall portion 11 therebetween.

In this embodiment as well, the outer casings 14 and 15 have the same gun shape, but one of the outer casings 14 and 15 is used by changing its direction in the opposite direction. As in the case of FIG. 5, the side grooves of the outer casing are the same from the inlet to the outlet and from the outlet to the inlet. When arranging the discharge port 1 of the first stage outer casing 14
0 is connected in series to the suction port 9 of the membrane outer casing 15 via the outer air guide pipe 18. Therefore, the operation in which the annular blower sections of the i and n stages are connected in series and the pressure is increased in the I and 11 stages to obtain a high blowing pressure is the same as that shown in FIG.

Next, a case will be described in which the 1st and 11th stage divided annular blower sections are connected in parallel. In the case where a high air blowing pressure is not required as in the previous embodiment, but instead a large air blowing amount is required, for example, the surface-divided casings 14 and 15 in FIG.
The suction ports 9 and the discharge ports 10 are connected in parallel by external piping. Therefore, the pressure is 1/1 compared to the previous example.
2. Double the characteristics with air volume.

Although the above description has been made regarding the case of series connection and parallel connection, it is also possible to configure such independent annular blower sections of each stage to be independently connected to two different pneumatic loads.

〔Effect of the invention〕

As described above, according to the present invention, the central partition casing is divided into 1. I[By arranging the impeller and the outer casing on both sides of the common partition casing
Inside the single-piece annular blower section, independent annular blower sections divided into I and 11 stages are formed. Therefore, the structure is simpler and more compact than the conventional arrangement in which two tiers of annular blower sections each having a pair of casings and having grooves on both sides are arranged side by side. Furthermore, since the outer casing can be constructed in the same shape, the gun shape can be formed using the same mold during manufacturing, which is advantageous in that manufacturing is simple. Moreover, the air blowing characteristics are particularly good because it has a single structure with side grooves and impellers formed independently in each stage.

When n-stage annular blower sections are connected in series, double the air blowing pressure can be obtained with the same impeller diameter of the annular blower sections shown in Fig. 2, and high air blowing can be achieved with a simple and /J% type structure. Pressure annular blower can be provided.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional annular blower, Fig. 2 is a longitudinal cross-sectional view of the single-stage annular blower shown in Fig. 1, and Fig. 3 is a diagram showing ■-■ in Fig. 2.
4 is a vertical sectional view of an embodiment of the present invention, FIG. 5 is a schematic developed view of the impeller and each casing in FIG. 4,
FIG. 6 is a schematic development view of another embodiment. DESCRIPTION OF SYMBOLS 1... Drive electric motor, 2... Annular blower part, 7...
Rotating shaft, 8...Gutter, 12.13... Impeller, 1
2a. 131...Blade, 14.15...Outer casing,
16... Partition casing, I, II... Divided annular blower section having each independent air guide path. Figure 3 “is mouth”

Claims (1)

[Claims] 1) In an annular blower consisting of an impeller having a large number of blades arranged upright on the circumferential surface on only one side in the axial direction, and a casing having a side groove facing the blades, a flat plate located in the center A two-stage annular blower section is formed from a partition casing, a pair of identical impellers arranged back to back on both sides of the partition casing, and a pair of outer casings facing the pair of impellers, and each of the above-mentioned 1. An annular blower characterized in that an outer casing is provided with a discharge port and a suction port corresponding to series connection or parallel connection.