SU1031422A1 - Storm-type centrifugal fan - Google Patents

Description

2. Fan pop, 1, distinguishes and with the fact that, for the purpose of delimiting the injected tpBHcnopTHpyrouiero

air flow, in front of the impeller is installed overlapping its central part of the fairing.

one . The invention relates to an agricultural machine building and is designed for pneumatic conveying of flushes in a tea picker machine. I A centrifugal fan is known, consisting of a spiral casing with a front blind wall and a back stack with a central opening through which a hollow pipe shaped passes. the shaft with impeller fixed on it 13 The disadvantage of this fan is cumbersome, due to the large dimensions of the hollow shaft necessary to pass the transportable mat rial The closest to the proposed technical essence and the achieved effect is a tornado-like centrifugal fan containing a spiral casing with a cylindrical niche located on its rear wall, in which a working wheel with console-mounted blades mounted on the front the wall of the spiral casing communicating with the pneumatic conveying pipeline inlet manifold G2. A disadvantage of the known fan is low productivity and trauma to the impeller part of the flash drives. The purpose of the invention is to increase the performance of the fan and reduce damage to the transported material. This goal is achieved by the fact that the impeller disk is made with radially arranged windows and with gripping face blades mounted on the back side of the disk, with guide nozzles communicating with the environment installed on the bottom of the cylindrical niche. In addition, in order to distinguish between the conveying AND injected air flow, in the front part of the impeller is installed a fairing overlying its central part. Figure 1 shows a tornado-like centrifugal fan, a slit; figure 2 is a view along arrow A in figure 1; on fig.Z section bb in figure 2. The centrifugal fan of a tornado type consists of a spiral casing 1 and an impeller 2. On the rear wall of the spiral casing 1 is provided with a cylindrical niche 3, and on its front wall there is an inlet collection Top k communicating through the spiral casing 1 with the exhaust pipe 5. Working the wheel 2 is located in the niche 3 and is mounted on the shaft 6 passing through the central hole in the bottom 7 of the cylindrical niche 3. The shaft 6 is mounted in the bearings 8 of the bed 9, on the end of which the bottom 7 of the niche 3 is fixed. The impeller 2 is equipped with a maintenance disc with windows eleven and pick-up end blades 12. On the bottom 7 of the cylindrical niche 3 there are holes 13 with guide nozzles 1. The inlet manifold D is connected to the pipes by a pneumatic conveyor wire (not shown}, and in the central part of the impeller 2 there is a fairing 15, made with working surfaces to demarcate the air flow. The rotation of the shaft 6 is carried out by a drive (not shown j by means of a pulley 16 rigidly mounted on the shaft 6. The fan operates as follows. . When the impeller 2 rotates in a spiral band. This case 1 generates an intense circular flow of air entering through the inlet manifold. Due to this, the main part of the transporting air flow together with the transporting material, carried away by the friction forces with the swirling air, passes through

case 1 fan, mine impeller 2.

Through the guide nozzles T and the holes 13, air is fed into the impeller 2 by forcing atmospheric air with end-blades 12 into the windows 11 of the disk 10 of the impeller 2. The air flowing through these windows into the inter-blade space of the impeller is scattered in the radial direction. kinematic energy leaves the impeller. in its peripheral zone, located between the outer diameter of the fairing 15 and the inner diameter of the niche 3, thereby preventing the possibility of falling into the impeller incoming through the inlet manifold of the transporting air stream and the material transported by it.

The presence in the proposed tornado-type fan of a device for force-feeding the impeller with atmospheric and spheric air increases the density and amount of air supplied to the impeller and contributes to an increase in the intensity of circular motion

the main air flow in the spiral cavity of the fan casing and thereby increasing the performance of the fan.

The positive effect of using the invention is to increase productivity and the associated Skatim by reducing the metal content and energy consumption of the pneumatic conveyor, as well as by reducing the damage to the material being transported.

view A

ff-ff

Claims (2)

1. CENTRIFUGAL, FATAL TYPE FAN, comprising a spiral case with a cylindrical niche located on its rear wall, in which an impeller is mounted with cantilever attached to the disk. blades, and located on the front wall of the spiral casing, communicating with the pipeline of the pneumatic trans- ^{1 of the} porter, the input manifold, characterized in that, in order to increase fan performance and reduce damage to the transported material, the impeller disk is made with radially located windows and mounted on the rear side of the disk with exciting end blades, with guide nozzles communicating with the environment installed on the bottom of the cylindrical niche. 1031 ^ 22 air flows, in the front part of the impeller a fairing covering its central part is installed. 2. Fan pop. 1, distinguish ~ and; and with the fact that, in order to distinguish between the transporting pumped