SU1752311A1 - Device for blocking and protection of tea drying unit - Google Patents

Abstract

Use: in the tea industry. SUMMARY OF THE INVENTION: The device comprises a fuel oil pipe 1 with a solenoid valve 2, a firebox 3, a fire-tube heater 4, a drying chamber 5, an electromagnetic clutch 6, a fan 7 with electric drive 8, a water tank 9, a drain pipe 10 with a solenoid valve 11, a turbine 12, installed in the diversion reservoir 13, as well as the belt 18 and the bevel gear 14, the electromagnetic coupling half 16 for connecting the turbine 12 to the fan 7 and the electrical control circuit 2 of the mud.

Description

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The invention relates to tea production and can be used to increase the durability of a drying plant.

The purpose of the invention is to ensure safe operation.

FIG. 1 is a schematic diagram of a device for blocking and protecting a tea-drying unit; in fig. 2 - electrical control circuit.

The device contains a fuel pipe 1 with a solenoid valve 2, a furnace 3, a fire tube heater 4, a drying chamber 5, an electromagnetic clutch 6, a connecting fan 7 driven by an electric motor 8, a water pressure tank 9 for creating water pressure, a drain pipe 10 having an inlet solenoid valve 11, hydro turbine

12 installed in the diversion tank

13, a conical 14, a belt transmission 15 and an electromagnetic coupling half 16 for connecting the turbine to the shaft of the fan 7.

The electrical control circuit contains an electromagnetic actuator KM for switching on the electric drive 8, an intermediate relay KV with three closing contacts KV1, KV2, KV3, a time relay CT with one closing contact CT, with a time delay when opening, the coil YA1 of the electromagnetic coupling 6, the coil YA2 of the electromagnetic valve 11, coil YA3 of the electromagnetic coupling half 16, coil YA4 of the solenoid valve 2 of the fuel oil pipe 1, capacitor C and control buttons SB1 Start and SB2, SB3 Stop.

The device works as follows

By pressing the button SB1, the power is supplied to the magnetic starter KM and the intermediate relay KV, and the electric drive 8 of the fan 7 is turned on. At the same time, the contacts of the relay KV1, KV2, KV3, CT are energized, supplying respectively the electromagnetic coupling YA1, the coil YA2 of the electromagnetic valve, the time relay KT and solenoid valve YA4. In addition, the time CT relay closes the power supply circuit of the YA3 coupling half coil, causing the fan 7 to be disconnected from the turbine 12. The operation of the electromagnetic clutch 6-YA1 causes the kinematic target 8 to close the electric motor - the fan 7, which gives the latter the nominal rotational speed. The inclusion of the solenoid valves YA4 and YA2 causes the opening of the fuel oil pipe 1

and the overlap of the water supply to the hydro-RFF 12, which corresponds to the normal mode of operation. The fuel oil entering the furnace 3 is burned evenly, resulting in

Flue gases flow around the outside of the cast-iron air heater tubes 4 and heat them to a high temperature. The fan 7 draws air through the heating pipes and drives it into the drying chamber 5 for drying tea,

moving along horizontal conveyors from top to bottom.

At the onset of emergency mode (power outage), the YA4 solenoid valve quickly activates and blocks the supply of fuel oil to the furnace 3. At the same time, the KV relay opens the power supply circuit of the electromagnetic clutch 6-YA1, as a result of which the fan 7 receives free rotation. From the same moment, the coil YA2 is turned off and the solenoid valve 11 opens, supplying water from the water reservoir 9 through the drain pipe 10 to the blades of the hydroturbine 12. The rotation of the hydroturbine 12 through the conical

the pair 14 and the belt drive 15 is transmitted to the half coupling 16, which is triggered exactly at the moment when the frequency of its rotation coincides with the natural frequency of rotation of the fan 7, which is achieved

due to setting the dwell time of the CT time relay. This eliminates possible deceleration of the fan 7. Continuing from the hydroturbine 12, the fan 7 does not stop for several minutes.

suck the air through the heater tube 4, which leads to its rapid cooling and fading.

Claims (1)

Invention Formula A device for blocking and protecting a tea-drying unit, including a fuel oil pipe, a fire chamber, a fire-tube heater and a drying chamber, an electrically driven fan installed between the latter, characterized in that, in order to ensure safe operation, it is equipped with a water-pressure tank connected by a drain pipe with a drainage tank, inside of which a hydro turbine, as well as an electrical circuit for switching on the electric drive of the fan, wherein the hydraulic turbine is connected by means of a bevel, belt transmission, electromagnetic coupling half and electromagnetic coupling with the electric drive of the fan, interconnected, and the fuel oil and drain pipes are equipped with electromagnetic valves. Fv 3J31JJSZ rferifc-DU T-J% rjb-fr-chb I- JV4 / KH2. Fu Xv / ftVZ A  IG