JPS61101699A - Blower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to devices for generating air flow, and more particularly to blowers.

The present invention can be used in centrifugal axial blowers employed in power mechanical engineering, mining, metallurgy and chemical industries.

1. A housing comprising a suction conduit and a suction chamber arranged in series, an air blower having an airflow regulator disposed inside the housing, a bypass conduit connected to the suction chamber, and an air flow regulator. For example, Soviet inventor certificate No. 164,917: IPCFO4D 29156,
The one published in 1969 belongs to this category.

When the condition becomes unstable, the blockage choke of the flow regulator is opened, and the flow rate is increased by the air introduced from the outside to achieve stable operation of the blower and a larger volumetric flow rate. be. However, because air intake conditions are unproductive, blower power increases and blower efficiency decreases.

Conventionally, a blower has an impeller disposed in a single housing, has a suction conduit, and further has a means for generating its own swirling action on the air flow sucked into the impeller, disposed within the suction conduit or in the suction housing. is publicly known. This corresponds to the type of guide vane device. For example, Gui
N Kovalevmk (V, N, Kovalevmk)
aya) and Gui Ni Spipack (V, A, 5p
ivak) co-authored ``Mechanical Engineer's Blower Equipment (Mas
hinlst ventllyatornolusta
novki) J, page 27, Nedr
a) Publisher, Mosney, 1979. However, with such a blower, it is difficult to ensure reliable adjustment during operation of the blower. The reason is that the intake air fi
This device for generating its own swirling flow for K has a significant number of components arranged in this flow, and this suction air flow rarely contains dust or corrosive compositions. This is because it occurs instead of. Furthermore, the guide vanes create resistance to flow and have a negative effect on the overall efficiency of the blower.

SUMMARY OF THE INVENTION An object of the present invention is to provide a blower having a structure that ensures high reliability in adjusting the operating state of the blower and simplifies the structure of the blower.

Means for Solving the Problems A blower is provided with a suction conduit disposed within the housing and means disposed within said suction conduit for producing a self-swirling effect on the inlet air flow entering the impeller. In contrast, according to the invention, the means for creating a swirling effect on the air flow sucked into the impeller include at least one bypass conduit, the inlet of which is arranged inside the blower suction conduit; In that case, its outlet is formed tangentially to the suction conduit in the vicinity of the impeller on the downstream side of the flow, and a baffle is incorporated in the suction conduit which separates the introduced air flow into a main flow and an additional branch flow. The additional branch flow then flows into the pipe/quarter conduit.

Preferably, each pi-nus conduit is of the form of a single tube member communicating with a suction conduit of a blower with an impeller suction area, or the height of said baffle is preferably such that the height of said baffle is It has a height that is smaller than the cross-sectional height of the suction pipe in which it is arranged. The configuration disclosed herein increases blower efficiency, simplifies its construction, makes the blower less expensive to manufacture, and improves the reliability of blower operation.

Embodiment In FIG. 1, the blower of the present invention has a housing 1 and an impeller 2 which is housed under the internal pressure of the housing and is mounted on a single shaft 3. The blower has a suction cone or suction conduit 4, which is equipped with a removable suction housing 5. The suction housing 5 has built-in means for generating a swirling effect on the airflow flowing into the impeller 2 by itself.

This means includes a bypass conduit 6 and a pi/? The outlet 8 of the bypass conduit 6 is tangential to the suction conduit 4 in the vicinity of the inlet 2 when viewed along the flow of the suction inflow air as shown in FIG. are connected in a shape. The means for imparting a self-swirling effect to the inlet air stream also include a baffle plate 9 (see FIG. 1) provided in the suction housing 5, which separates the inlet air into a main stream 10, indicated by reference numerals 10 and 11, respectively. It is for separating into an additional branch stream 11. The outlet 8 of the pinous conduit 6 divides the incoming air into a plurality of flow sections by means of fixed vanes 12, as shown in FIG. As shown in FIGS. 1 and 2, the pinhole conduit 6 is formed in the form of a single tubular member communicating with a suction cord 74 and the suction area of the inlet 2. The baffle plate 9 shown has a height h smaller than the cross-sectional height H of the suction housing 5 in which it is installed.The difference in height t=H
-h ranges from 0.15 to 0.3 times the diameter of the impeller 2.

Referring to FIG. 4, the diagram shows another variant of the proposed blower with an axial air introduction inlet. In this variant, the suction conduit 13 is constructed with a substantially hollow hollow protruding ear 14 in its tube wall (the fifth
(FIG.) Its outlet 15 is connected to the suction conduit 13 in such a way that an additional branch flow 11 flows tangentially into the suction conduit 13.

The inlet hole 16 of the hollow ear 14 shown in FIG. 6 is connected to the suction conduit 13 upstream of the impeller 2 (FIG. 4). The baffle plate 17 is arranged in the suction conduit 13 between the inlet 16 and the outlet 15 of the hollow ear 14 (FIG. 7). Furthermore, FIG. 7 illustrates another arrangement of the baffle plate 17 (intermediate position).

Function and effect of the invention The disclosed blower operates as follows.

When the blower is operated in an operating mode with rated capacity and pressure characteristics, the baffle plate 9 closes the lower inlet of the pinos conduit 6. The entire air flow is thereby introduced into the impeller 2 through the suction housing 5 and the suction cone 4.

If required, adjustment of the operating condition of the blower can be achieved by swinging the baffle plate 9 to the required angle and dividing the incoming air flow into two streams, a main stream 10 and its subsidiary branch 11. Ru. Its main stream 10 passes through the suction housing 5 in the same direction as its axial direction and is carried through the suction conduit 4 towards the impeller 2, while the additional branch stream 11 passes through the suction conduit 6 in the direction of its axis. through the inlet and then through its outlet 8 into the suction conduit 4 tangentially, thereby creating a swirling effect on the flow introduced into the impeller 2 so that it is introduced in line with the direction of rotation of the impeller 2. become.

As already understood, this results in a drop in the pressure built up by the blower, ie it begins to operate under conditions corresponding to the adjusted operating characteristics. The gap corresponding to the above-mentioned height difference value t provided between the baffle plate 9 and the wall of the suction housing 5 is formed by introducing a part of the main flow 10 into the wall of the suction housing 5, and this is This causes an additional swirling flow to occur in the main stream 10.

The variants of the invention shown in FIGS. 4 and 7 operate in a manner similar to that described above.

The present invention can perform the same function without the need for the complicated guide vane system of the prior art. Significantly simplifying the structure of the blower can reduce labor and manufacturing costs. By reducing the flow resistance caused by the guide vanes, the maximum efficiency of the blower is increased.

By avoiding the flow separation effect of the guide vanes and preventing pressure losses occurring therein, an enlarged adjustment range is made possible. Additionally, the reliability of the flow conditioning device is improved due to the substantially reduced number of parts.

[Brief explanation of drawings]

FIG. 1 shows a schematic diagram of a blower according to the present invention, in which a tangential air inlet is provided. FIG. 2 is a sectional view taken along the line ■-■ in FIG. Figure 3 is the ■− of Figure 1.
■A cross-sectional view drawn along a line is shown. FIG. 4 shows an embodiment of the pond of the present invention having an axial air inlet. FIG. 5 shows a pond according to a second modification of the present invention. 4, FIG. 6 is a cross section taken along the line ■-■ in FIG. 4, and FIG. 7 is a top plan view of a second modified example of the blower according to the present invention. 1... Housing, 2... Inner, 3... Shaft,
4... Suction conduit, 5... Suction casing, 6... Bypass conduit, 7... Inlet of pinosu 4th conduit 6, 8...
- Outlet of bypass conduit, 9... Baffle plate, 10... Main flow of suction nitrogen, 11... Additional branch flow, 12... Fixed blade, 13... Suction conduit, 14... Hollow Protruding ear portion, 15... Outlet of the hollow protruding ear portion 14, 16... Inlet of the hollow protruding ear portion 14, 17... Baffle plate. Below margin F wide I Fl, 7

Claims (1)

[Claims] 1. An impeller (2) provided in the housing (1), a suction conduit (4), and a means for independently rotating the introduced air flow sucked into the impeller (2) within the suction conduit. wherein the means for imparting a swirling action to the air flow drawn into the impeller (2) comprises at least one
one bypass conduit (6) and an inlet (7) disposed within said suction conduit (4);
the outlet (8) of is tangentially coupled to the suction conduit (4) in the vicinity of the impeller (2) downstream of said suction flow;
and a baffle plate (9) is integrated and formed in the suction conduit (4) so as to separate the flow of incoming air into a main flow (10) and an additional branch (11), this additional branch (11) being connected to said bypass. A blower characterized in that it is introduced into a conduit (6). 2. The blower according to claim 1, wherein each of the bypass conduits (6) is configured as a single tubular member communicating with a suction conduit (4) forming a suction area of the impeller (2). A blower characterized by: 3. In the blower according to claim 1, each bypass conduit (6) has a hollow protruding ear portion (
14) A blower characterized by being configured as follows. 4. In the blower according to claim 1 or 2, the height of the baffle plate (9) is greater than the height of the cross section of the suction pipe (4) in which the baffle plate is disposed. A blower characterized by being formed to be small.