SU1469174A2 - Air stream switching device - Google Patents

Abstract

The invention relates to the mining industry, and may be used to reverse the air flow. The goal is to increase the reliability of the switch by increasing the durability of the elastic pads 13. For this, the locking element 7 has an annular elastic insert 8. The latter is fixed by one end around the perimeter of the outlet of the knee, and the other around the perimeter of the outlet of the knee. The element 7 is fixed on the edge of the outlet of the knee 4 by means of hinges 9 with the possibility of its rotation relative to the edge of the elastic pads 13. Due to this connection of elements, the arc length along which abrasion of the lining 13 located around the circumference of the housing opening is reduced by half 13 during the rotation of the knee 4. This reduces the wear of the pads 13. 7 Il. o (l

Description

05 WITH

four

Phi. 2

The invention relates to the mining industry and can be used for reversing the air flow and switching the working and backup fans.

The purpose of the invention is to increase the reliability of the switch by increasing the durability of the elastic pads.

Fig. 1 schematically shows an air flow switch, a plan view (knee rotation supports and a drive conventionally not shown); figure 2 - section aa in figure 1; fig.Z - node I in figure 1; figure 4 - section bb in fig.Z; on fig.Z - section bb In fig.Z; figure 6 - switch diagramU

When turning the knee 4 to the desired position (FIG. 6), the locking element 7, due to the variable radius of curvature (with a transition from small to large radius), covers (FIG. 7 a, b, c, d) the edge of the elastic lining 13 (a) and then as the knee moves, the locking element 7 rotates in the hinges 9, without having a significant force impact on the lining 13 (b) until the hinge 9 is in the contact zone of the locking element 7 with the lining 13 (c), only after that the locking element 7 due to its large radius of curvature, in. least

l stream with attached to it

fans; FIG. 7 is a flow diagram; 20- Movement of the knee presses the elastic

the cover plate 13 and makes a tight connection of the bend in the knee to the side opening 2 (g). When the locking element 7 is rotated, the latter deforms the elastic annular insert 8 designed for this and thus the tightness of the bend of the knee is not disturbed. To prevent over-stretching of the ring insert

thirty

a company of a hinged annular lining when contacting it with elastic pads during rotation of the knee (at the top is a view of the contact front, at the bottom is a reconciliation view, in which the curvature of the body and the locking element are conventionally shown as a sweep to the straight line).

35

40

The flow switch includes a housing 1 with side openings 2 connected to side connections (not shown) and a mechanical connection 3, bend 4, knee rotation supports - cantilever shaft 5 with a bearing and a gunbox assembly 6, a locking element 7, made according to a variable radius curve and provided with an elastic annular insert 8, the locking element 7 is attached to the end of the bend by means of hinges 9 rigidly fixed on the flange 10 of the bend by means of brackets, and is connected by its opening 11 to the hole 12 of the bend of the knee by j elastic ring insert 8 attached to the edges of these holes. The side openings in the switch housing along the perimeter are fitted with elastic pads 13. The face opening is provided with a sealing ring 14. The knee is driven

15 revolutions. To the side connections of the switch attached suction

16 and pressure 17 air ducts of the working fan 18 and the standby fan 19. The end connection of the switch is connected to the ventilation duct at the shaft 20 of the shaft.

50

55

8 flange 10 limits the calculated limits. rotation of the locking element 7 at the moment of the locking of the locking element 7 into the flange 10 (FIG. 3). Due to the possibility of rotation of the locking element 7 around the axis of the hinges

The rubbing of the elastic strip 13 in the first half of the contacting arc practically does not occur and its wear is reduced. In the initial position of the switch (Fig. 6), the air moves along the path: ventilation duct 20 — elbow 4 — lateral orifice 2 — lateral branch pipe — suction inlet; duct 16 — working fan 18 — discharge duct 17 — lateral branch pipe — side 2 - in atmosphere. To reverse the airflow, bend 4 must be turned to the side opening 2, to which an air duct 17 is connected through the side nozzle, and the air will flow like this: atmosphere — side nozzle — side aperture 2 — suction duct 16 — fan 18 — duct 17 — side opening 2 - knee 4 - ventilation channel 20. To transfer the operation of the fan installation to the backup fan, knee 4 optional

691742

The switch works as follows.

When turning the knee 4 to the desired position (FIG. 6), the locking element 7, due to the variable radius of curvature (with a transition from small to large radius), covers (FIG. 7 a, b, c, d) the edge of the elastic lining 13 (a) and then as the knee moves, the locking element 7 rotates in the hinges 9, without having a significant force impact on the lining 13 (b) until the hinge 9 is in the contact zone of the locking element 7 with the lining 13 (c), only after that the locking element 7 due to its large radius of curvature, in. least

ten

15

0

five

0

j

0

five

8 flange 10 limits the calculated limits. rotation of the locking element 7 at the moment of the locking of the locking element 7 into the flange 10 (FIG. 3). Due to the possibility of rotation of the locking element 7 around the axis of the hinges

The rubbing of the elastic strip 13 in the first half of the contacting arc practically does not occur and its wear is reduced. In the initial position of the switch (Fig. 6), the air moves along the path: ventilation duct 20 — elbow 4 — lateral orifice 2 — lateral branch pipe — suction inlet; duct 16 — working fan 18 — discharge duct 17 — lateral branch pipe — side 2 - in atmosphere. To reverse the airflow, bend 4 must be turned to the side opening 2, to which an air duct 17 is connected through the side nozzle, and the air will flow like this: atmosphere — side nozzle — side aperture 2 — suction duct 16 — fan 18 — duct 17 — side nozzle side opening 2 — knee 4 — vent duct 20. To transfer the operation of the fan installation to the backup fan, knee 4 neF. 3

jig

/eight

1B 1

77

FIG. 6

8-in

 five

ps

FIG. five

Claims (1)

5 claims Autoswitch air flow switch No. 608952, characterized in that, in order to increase the reliability of the switch by increasing the durability of the elastic plates, the locking element is equipped with an elastic ring insert fixed at one end along the 15th perimeter of the knee outlet, and the other end connected to the locking element, while the locking element fixed on the edge of the knee outlet through 20 hinges with the possibility of rotation relative to the edge of the elastic knee-δ-5