US1950942A - Drying apparatus - Google Patents

Description

Inv e n Tor. Hermann Home ATTys.

H. HAAsv DRYING APPARATUS Filed Feb. 27, 1931 Flg. l.

March 13, 1934.

Patented Mar. 13, 1934 19,950,942 A" DRYING APPARATUS Hermann Haas, Lennep, Germany Application' February 27, 1931, serial no. 518,619

In Germany March 11, 1930 42 claims. (C1. 34-19) This invention relates to a continuous drying apparatus of that type which comprises a dryline 2 2, Fig. 1;

ing chamber divided into a plurality of 'communicating sections through which the material to be dried passes progressively, and which is also provided with means for establishing a local circulation of the drying medium through each section as well 'as a progressive movement of the drying medium through the chamber from one end to the other.

In prior drying apparatus of this type it has been customary to provide means for heating locally the drying medium which is circulated through each section of the drier.

The present' invention has for its, object to provide a drying apparatus of thisv general -type in which the drying medium which is being locally circulated in `the separate sections is heated from a central or common heating apparatus that may be, located at a greater or less distance from the dryingv chamber. Thedrying medium which is thus heated at the central of the .drier and thecorresponding circulating passage H.- c

In accordance with the presentdnvention the heated air which is utilized for drying the material in the drying chamber 1 is furnished from an air heater L that is common to all of the Vsections A, B, C, D, etc..of the drying chamber.

heating-station is distributedto the different.

sections of the drier in the proportions'needed to maintain the desired temperature and drying conditions in each section.

In the accompanying drawlng wherein I have.

illustrated a selected embodimentof my. invention, Fig. 1 is a side view of a drier embodying my invention; Fig. 2 is a sectional view on substantially the Fig.. 3 is a section on the line 3--3, Fig. 2.

In the drawing 1 indicates the drying chamber which is herein shown as di ided to uform a plurality of sections A, B, C, D, `,`etc. which are connected to each other The material to be dried is passed progressively through the `:on-

lleading to the lower portion of each of the cir- This air heater L may have any suitable or usual construction. It is shown as having associated therewitha fan or blower V by which air `is supplied to the heater for being heated and said heater is also provided with a discharge pipe R provided with branches 8, one branch culating passages H. YEach branch 8 is provided with a valve by which the amount of heated air delivered throughthe branch may be regulated, these valves being indicated at S1, S2, S3,

G indicates an aspirator or suction device which is connected to the entering end of the drying chamber 1. At the other end the drying chamber 1 is provided with an inlet opening O which leads into the last section E. The operation of the suction device G is to cause a gradual movement ofthe air through the drier from the delivery`end to the entering end.

Y If desired, the air which is fed to the heater L by the blower V may be taken from thesection E through the medium of a pipe connection In the operation of the device the blowers 5 will create a local circulation of air in each section ofthe drying chamber and through the operation of the heater L and blower V hot air will be supplied through the branch pipes 8 to rthe various'sections of' the drier, such hot air necting sections, said material 'entering the section A at the left hand end and'progressing through the various sections and being discharged irom the right hand end of section E.

Associated with each section of the drier and situated at one side thereof is a circulating passage H Which is separated from the drying chamber by a partition 2.

Each circulating passage H, communicates' with the drying chamber throughtwo openings 3 and 4 that are formed in the partition 2, the opening 3 being at the upper part 4of the partitionand the opening 4 at the lower part thereof. i

5 indicates a fan or air-forcing, device which operates to create a local circulation, indicated by the arrows 6, Fig. 3, through each vsectibn commingling with and forming part of the local 1 circulation in each section indicated by the ar- 'A rows,6. 95 f By regulating the valves S1, 'SZ, S3, S4, etc. the amount of hot air which is delivered to-each A section can be adjusted so as to maintain in each section A, B, C, D the desired drying conditions. The suction device G will maintain a progressive circulation of air from the section E through the vvarious sections to and through the section A.

By providing a single air-heating device for all of the various sections of the drier it is possible to locate this heating device at a greater or less distance from the drying chamber and also to use heat'which would otherwise go to waste for heating the air.

I claim:

1. A drying apparatus comprising a drying chamber through which the material to be dried passes from one end to the other and which is divided into a plurality of communicating sections, a circulating passage for each section, each circulating passage communicating with the drying space of its section at both the top and the the bottom thereof, a valve in each branch, and.

means independent of the fans for delivering heated air from the air heater into said circulating passages through the branches of said conduit.

2.1"A drying apparatus comprising a housing enclosing a drying chamber through which the` material to be dried passes from one end to the other and which is divided into a plurality of communicating sections, vertical partitions forming within said housing circulating passages, one for each section, each. circulating passage having a dimension lengthwise of said housing equal to the corresponding dimension of the corresponding section and extending from the top-to the bottom of the housing, and communicating with the drying space of its section at both said top and bottom thereof, a fan in each circulating passage at the bottom thereof for producing a local circulation through said passage and the Acorresponding section of the drying chamber,

means for producing a progressivecirculation from the discharge end of the drying chamber to the entering end, an air heater common to all of the sections of the drying chamber but separate from and located exterior thereto, a conduit leading from said air heater and provided with branches, one leading into each circulating passage at the bottom thereof adjacent one end, and means independent of the fans for withdrawing air from the delivery end of the drying chamber and passing it through the air heater and into said conduit and through said .branches into the circulating passages and a valve in each branch to control the ow of heated air therethrough. f

` HERMANN HAAS.

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