RU22226U1 - ROOF FAN UNIT FOR HOT GASES - Google Patents

Description

Roof fan assembly for hot gases.

The invention relates to the field of fan building, in particular to fan designs for moving hot gases, and can be used for short-term operation at a temperature of 400-600 ° C, for example, for removing hot gases in a fire.

A roof fan assembly for hot gases is already known, comprising an impeller with backward curved blades and a vertical axis of rotation, housed in a housing equipped with an inlet manifold of hot gases and two oppositely directed tangential exhaust pipes, and an impeller drive through an electric motor mounted on top of the impeller housing a wheel equipped with an impeller placed on the motor shaft with the side of its free end, and a casing with inlets and, at least least one outlet, (U.S. Patent 4,768,424 №, F24 F 7/007, opubl.1988g).

In order to increase the efficiency of thermal protection of the engine in the known device, the organization of the two-way output of the flow allows you to directionally remove it to the greatest possible distance from the space surrounding the engine casing. However, the use of an impeller with backward curved blades and with the accepted ratios of the sizes of the outlet openings and the casing at a temperature of the transported gas exceeding 400 ° C to ensure efficient cooling of the engine ;, it insulates the engine compartment or significantly increases the performance of its cooling impeller.,. L-; -; - in g; ;

The objective of the proposed utility model is to improve engine cooling conditions.

To solve this problem, in the well-known roofed unit for hot gases, containing a radial impeller with curved blades and a vertical axis of rotation, located in a housing equipped with an intake manifold of hot gases and two oppositely directed tangential exhaust pipes, and the impeller drive by means of an electric motor mounted on top of the impeller housing, equipped with an impeller placed on the motor shaft from the side of its free end, and a casing m with inlets and at least one outlet, according to the proposed technical solution, the impeller blades are made bent forward in the direction of their rotation, and the width of the outlet of each outlet pipe of the impeller housing in the plane of rotation of the impeller is 0.2-0 , 3 largest

IPC: 7F24F 7/007, F04D29 / 58

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the cross section of the impeller housing in this plane.

In the proposed roof fan assembly, the inlet openings of the electric motor casing can be placed above the zone of its impeller and oriented at an angle of 90 ° relative to the sides of the impeller casing with exhaust pipes, the surfaces of the electric motor casing adjacent to the bottom of its inlet openings are inclined at an angle of 20 - 45 ° to the vertical axis of the impeller, with the possibility of opneHfaiijffl along them from the outside and from the inside of the air intake casing.

Analysis of the known patent and scientific and technical literature did not reveal the fame of the claimed combination of essential features.

The invention is illustrated graphically. Figure 1 presents a General view of the inventive unit. . In FIG. 2 shows a top view of the housing

the driving wheel - on AA. In FIG. 3 - shows a fragment of the impeller with

forward curved shoulder blades.

The proposed roof fan assembly for hot gases contains a radial impeller 1, the blades 2 of which are made bent forward in the direction of their rotation. The impeller 1 has a vertical axis of rotation 3 and is placed inside, for example, a spiral case 4, equipped with an inlet manifold 5 of hot gases, and two oppositely directed tangential exhaust pipes 6. The width of the outlet of each exhaust pipe 6 of the housing 4 of the impeller 1 in the plane of rotation of the working the wheel 1 is 0.2-0.3 of the largest cross-sectional size of the housing 4 of the impeller 1 in this plane. The impeller 1 is made with a drive from an electric motor 7, mounted on top of the housing 4 of the impeller 1 and mounted on it. The electric motor 7 is located inside the casing 8, which is also fixed to the casing 4 of the impeller 1. The casing 8 of the electric motor is provided with inlets 9 and at least one outlet 10. The roof fan assembly is equipped with an impeller And mounted on the shaft 12 of the electric motor 7 from the side its free end 13. The inlet openings 9 of the casing 8 can be placed above the zone of the impeller 11 and oriented at an angle of 90 ° relative to the sides 14 of the casing 5 of the impeller 1 with exhaust pipes 6. The surface of the casing 8 is an electric motor la, adjacent to its bottom inlet openings 9 may be formed inclined at an angle of 20-45 ° to the vertical axis 3 of the impeller 1.

hot gases from the premises. When pumping hot gases, the impeller 1 and the spiral housing 4 are subjected to strong heating. The heat from the hot gas stream, perceived by the impeller 1, is also transferred to the electric drive through the shaft 12. This heating of the electric motor 7 is significantly reduced due to blowing with cold air passing through the inlet 9 and outlet 10 openings on the casing 8 of the electric motor 7. The use of the impeller 1 with forward curved blades 2 and relatively small sizes of the outlet openings 6 of the housing 4 allows hot gases to be discarded far enough from the inlet openings 9 of the casing 8, which, along with their optimal location, prevents tit mixing the intake of atmospheric air and hot gases from nozzles 6.

The proposed fan assembly for hot gases has already been manufactured and tested. It is intended to be used to extinguish fires. The proposed unit is new and industrially applicable. Using it will simplify the design and increase the efficiency of engine cooling.

Claims (2)

1. Roof fan assembly for hot gases, comprising a radial impeller with curved blades and a vertical axis of rotation, housed in a housing equipped with an inlet manifold of hot gases and two oppositely directed tangential exhaust pipes, and an impeller drive by means of an electric motor mounted on top of the impeller housing a wheel equipped with an impeller located on the shaft of the electric motor from the side of its free end, and a casing with inlets and at least one outlet, characterized in that the impeller blades are made curved forward in the direction of their rotation, and the width of the outlet of each outlet pipe of the impeller housing in the plane of rotation of the impeller is 0.2-0.3 of the largest cross-sectional dimension of the impeller housing this plane. 2. The roof fan assembly for hot gases according to claim 1, characterized in that the inlet openings of the electric motor casing are placed above the zone of its impeller and are oriented at an angle of 90 ^° relative to the sides of the impeller housing with exhaust pipes, and the surface of the electric motor casing adjoining it from below the inlets are inclined at an angle of 20-45 ^o to the vertical axis of the impeller, with the possibility of orientation along them from the outside and from the inside of the air intake casing.