RU166801U1 - CONTACT CONVECTIVE DRYING CYLINDER - Google Patents

Abstract

A contact-convection drying cylinder containing a shell of a drum with steam channels drilled in it and concentrically located, plugged at the ends with threaded plugs providing periodic access for cleaning deposits, hollow trunnions having a central cavity and drilled radial channels are pressed into the drum shell from the ends, connecting the central cavity with the channels of the shell of the drum, so that each channel of the input and output pins corresponds to a certain channel p creep, while the dryer drum is made to rotate in bearings located in the bearing housings of the bed of the dryer.

Description

The utility model relates to the design of drying cylinders of drying machines and may find application in light industry.

A universal device is known for a condensate removal system using a scoop. Drying drums in which condensate was removed by a rotating scoop (bucket), rigidly fastened to the cast bottom of the cylinder. After introducing stamped steel bottoms into the structure to remove condensate, a welded steel ladle rotating with a cylinder was used. The condensate is removed from the drying cylinder using a scoop as follows. When the scoop is in the lower position, it captures the condensate and, when the cylinder is rotated, pours it through the hollow pin into the internal cavity of the rack. By means of a ladle, condensate is removed from the cylinder only when the latter is rotated. (Kugushev I.D., Terentyev O.A. et al. Theory and design of machinery and equipment have grown. Paper and cardboard machines: Textbook / Edited by BC Kurov, NN Kokushin. St. Petersburg: Polytechnic Publishing House University, 2006.588 s.).

The disadvantage of this device is that with an increase in the speed of rotation of the drum, the centrifugal forces increase in a quadratic dependence, thereby preventing the removal of condensate.

The second universal device is a siphon condensate removal system. Condensate is discharged from the cylinder through a siphon tube fixed motionless so that its lower end is always in the lower part of the cylinder, and the other end passes through a hollow pin and is connected to the condensation line. Condensation can also be removed from the cylinder during the stopping of the drums if there is sufficient pressure in the cylinders. (Kugushev I.D., Terentyev O.A. et al. Theory and design of machinery and equipment have grown. Paper and cardboard machines: Textbook / Edited by BC Kurov, NN Kokushin. St. Petersburg: Polytechnic Publishing House University, 2006.588 s.).

The disadvantage of this device is the design complexity, large weight and size indicators, low technical capabilities, as well as a slightly high heat transfer coefficient from the heating steam to the channel wall.

The technical result of the utility model is to increase the heat transfer coefficient from the heating steam to the wall of the drying cylinder, which helps to reduce the steam consumption and, as a result, reduce heat loss with passing steam removed from the drying cylinder along with the condensate drained. Simultaneously with increasing energy efficiency of the equipment, an increase in the heat transfer coefficient increases the density of the heat flux to the material to be dried from the coolant, which reduces the drying time of the fibrous material and the overall dimensions of the drying machine.

The technical result is achieved by the fact that the contact-convective drying cylinder contains a drum shell with drilled and concentrically arranged steam channels, plugged from the ends with threaded plugs, which allow periodic access for cleaning from deposits, hollow pins with central pins are pressed into the shell of the drum from the ends cavity and drilled radial channels connecting the Central cavity with the channels of the shell of the drum, thus, each channel of the input and output ACE corresponds to a specific channel jacket drying cylinder rotates in bearings contained in bearing housings bed dryer.

In FIG. 1 shows a drying cylinder, a longitudinal section.

In FIG. 2 shows channels of a shirt of a drum structure.

The device contains (Fig. 1) the shell of the drum 4 with drilled in it and concentrically located steam channels 3 of the shirt, plugged from the ends with threaded plugs 8, providing periodic access for cleaning from deposits. Hollow inlet and outlet pins 1 and 7 are pressed into the drum shell from the ends, having a central cavity and radial channels 5 connecting the central cavity with the channels of the drum shell. Thus, each channel of the input and output pins 1, 7 corresponds to a specific steam channel 3 of the shirt. The drying cylinder 6 (Fig. 2) rotates in bearings 2 located in the bearing housings of the bed of the drying machine.

The device operates as follows.

Drying of the fibrous material occurs on the outer contact surface of the shell of the drum 4 of the rotating drying cylinder 6. The rotation of the drying cylinder is carried out in bearings 2. The shell is heated by superheated steam entering its channels 3 of the shirt through the channels of the hollow inlet journal 1. Heat flow from the surface of the drum can be regulated by the consumption of heating steam, or by controlling its temperature. The spent steam is removed through the channels of the outlet hollow pin 7, either in a regenerative installation, or is used to heat the surface of other drums.

The device differs from the drying cylinders of a standard design with mechanical condensate removal devices, the design of the drying cylinder, in which heating steam is not supplied to the central cavity, where it would reduce its speed and condense on the generatrix of the wall, but enters the channels located in the jacket itself. As a result, by reducing the diameter of the steam jet to the size of the channel diameter, its speed increases many times, contributing to strong turbulization of the flow and separation of the formed condensate film. After passing through the channels of the shell of the drum, steam can either be sent to a drying cylinder with a channel steam supply system or condense in drying cylinders of a standard design if its parameters become unacceptable for reuse in the steam channels of the shell of the drum.

The proposed device has a high heat transfer coefficient from heating steam to the wall of the steam channel, contributing to a significant reduction in its consumption and allows the use of steam with lower parameters, allowing to obtain a uniform wall temperature of the drying cylinder along its axis, ensuring uniform dryness of the fabric, which simplifies its further processing. This device design eliminates significant steam losses caused by malfunction of the condensate traps, and there is no axial deflection of the cylinder, which allows you to stop the equipment without damping it, i.e. equalization of the surface temperature of the drying cylinder when it starts is instantaneous. A huge role in the developed design of the drying cylinder is played by its simplicity and reliability, i.e. there are no nodes in the device that could be deformed. As well as the drive device requires small drive power due to the absence of friction of the condensate layer on the surface of the drying cylinder, resulting in reduced operating costs. Also in the device there are no sharp fluctuations in drive power caused by the destruction of the condensate ring in transient modes of operation.

Claims (1)

A contact-convection drying cylinder containing a shell of a drum with steam channels drilled in it and concentrically located, plugged at the ends with threaded plugs providing periodic access for cleaning deposits, hollow trunnions having a central cavity and drilled radial channels are pressed into the drum shell from the ends, connecting the central cavity with the channels of the shell of the drum, so that each channel of the input and output pins corresponds to a certain channel p creep, while the dryer drum is made to rotate in bearings located in the bearing housings of the bed of the dryer.

Images