US1608854A

US1608854A - Drying apparatus

Info

Publication number: US1608854A
Application number: US72715A
Authority: US
Inventors: Haas Hermann
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-12-04
Filing date: 1925-12-02
Publication date: 1926-11-30
Anticipated expiration: 1943-11-30

Description

Nov. 30 1926.

H. HAAS DRYING APPARATUS Filed Dec. 2, 1925 Fig.1. 6

lnvenTor. Hermann Hons Anya.

Patented Nov. 30, 19126.

' UNITED" STATES PATENT OFF-1cm anama ms; or murmur, onnirm.

DRYING APPARATUS.

' Application filed December- 2, 1925, Serial No. 72,715, and in German y December 4, 182$.

- This inventioni'elates to drying apparatus of that type which comprises a plurality of drying chambers and a plurality of heat in c ambers arranged alternately so that a rying current may be assed through the chambers successively. n rior drying apparatus of thist e it has can the com: mon practice to emp 0y a single'zrir-forcing mechanism usually "in the form of an exhauster or suction apparatus which operates to draw the dryin current through the series of chambers, t e drying current being drawn into' a heating chamber ;where it is heated and then passing to the adjacent is drying chamber where it performs its drying function and then passing into the next heat-- ingchamber where it is reheated from which it passes to another drying chamber and so on. o

This arrangement has the disadvantage that since the single suction apparatus or exhauster is required to draw the'air current through all the chambers successively it is necessary to operate the exhauster with ak a drying apparatus of the above type which has alternately arranged heating and drying chambers by providing a construction by which the required movement of air will be secured through the chambers to efiect the necessaryldrymg with a considerably reduced power consumption. In order to give an understanding of the invention I have illustrated in the drawings a selected embodiment thereof which will now be described after which the novelv features. willbe pointedout in the appended i claims Fig. 1 of the drawings'is a sectional view illustrating an apparatus of the type which has heretofore beenus'ed;

Fig. 2 is a similar view illustrating an apparatus embodying my invention; Fig. 3 is a section on the line 3-3, Fig. 2; Referring firstfto Fig. 1,1, 2, and 3 inconsiderable vacuum in order to overcome the resistance which the air meets 111 passing dicate-dryingchambers and 4, 5, and 6 indicate heatlng chambers, said heating chambers having some suitable heating means ing chamber 1 communicates with the upper end of theheating, chamber 5 throu h an opening 10 and said heating cham er 5 communicates at its lower end with the drymg chamber 2through an opening 11. The

drying chamber 2 also has communication w1th the heating chamber 6 through :3 an

opening 12 and said heating cham communicates at its lower end with the drying chamber 3 through the opening 13.

14 indicates 'a suction or exhaustapparatus, theinlet of which has communication with a pipe 15, the latter having ports or openings 16 leading to the various drying chambers. Each opening is provided with a closure 17 by which it may be closed as shown in Fig. 1. The closure 17 for the opening 16 leading to the last drying chamber 3 is open, the other closures being closed and with this arrangement the eithauster 4 will draw air in through the open? ing 8- and pass it successivelythrough the heating an by the line of arrows 18. \Vith this arrangement the suction "apparatus has to develop sufiicient suction or vacuum to overcome the combined resistance in all of the chambers,

The improvements constituting the pres- 'ent invention consist of employlng a pludrying chambers asindicated rality of blowers, one for each drying,

chamber, each .blower being arranged to cause a local circulation through each drying chamber and the corresponding heating chamber and also tocause a progressive movement of the air through the drying chambers and heating chambers.

In Fig. 2, which illustrates my improvement, 19, 20 and 21 indicate drying chambers and 22, 23 and '24 indicate the corresponding heating chambers, each heating chamber having the heatingpipes 25 there in. Each heating chamber communicates With its corresponding drying chamber at both the top and the bottom and also communicates with the next adjacent drying chamben- For instance, the heating chamber 24 communicates with its drying chamber 21 through the top opening 32 and the bottom opening 31 and communicates with the adjacent drying chamber 20 through the opening 33. The heating chamber 223 communicates with its drying chamber 20 through the top opening 29 and the bottom opening 28 and also communicates with the adjacent drying chamber 19 through the opening 39. The heating chamber conununicates with its drying chamber 19 through the top opening 27 and bottom opening 26 and also communicates with the drying'chamber 21 through a passage or conduit 44 one end of said passage communicating with the upper end of the heating chamber 22 and the other end of the passage communicating with the chamber 21 through the opening 49.

Each drying chamber has an inlet open ing 39 leading thereto and a closure 40 for this opening. These closures may be independently opened so that the different inlet openings 39 may be selectively opened or closed. Each drying chamber also has an outlet or discharge opening 41 leading to a conduit42 which communicates with the atmosphere and each discharge opening 41 has a closure 43 by which it may be opened or closed. The closures 43 are capable of independent operation and thus the heating chambers may be selectively connected to thethe same shaft 37 which may be driven in any suitable way as by means of a driving pulley 38.

In the operation of the device the exhaust opening 41 of the heating chamber which corresponds to the drying chamber having the wettest material therein will be opened, the exhaust openings 41 of the other drying chambers being closed. and the inlet opening 39 of the drying chamber having the dryest material therein will be opened, the other inlet openings being closed. As shown in Fig. 2 it is assumed that the drying chamber 19 has the wettest material therein and the drying chamber 21 the dryest.

lVhen the shaft 37 is rotated and the windwheels or air-forcing

devices

34, 35

ing downwardly through the heating chamber and then into the lower end of the corresponding drying chamber and thence back into the heating chamber again'where it passes downwardly. In addition to these local currents there will be a gradual or progressive movement of the air through the chambers successively as indicated by the full lines, the air entering continuously through the open inlet port 39 (this port being the inlet port leading to the chamber having the dryest material therein) and passing progressively through the drying and heating chamberssuccessively to the open discharge port 41 (which will be the discharge port of the chamber having the wettest material therein). Hence with this arrangement there will be a local circulation through each heating chamber and its drying chamber and a progressive movement of the air from the chamber having the dryest material to the chamber having the wettest material therein.

When the material in the chamber-21 is thoroughly dried it may be removed and the chamber filled with wet material which is to be dried. When this is done the chamber 20 will then have the dryest material therein and the chamber 21 the wettest material and to ctntinue the drying operation the inlet portion 39 leading to the chamber 21 will be closed while the inlet port leading to the chamber 20 will be opened. Similarly, the discharge port 41 leading from the heating chamber 22 will be closed and that leading from the heating chamber 24 will be opened. When this is done then the air will be entering continuously through the inlet port into the chamber 20 which now contains the dryest material and will pass progressively through the heating chamber 23 through the drying chamber 19 and through the conduit 44 into the drying chamber 21 which contains the wettest material from which it will be discharged.

Vhen the material in the chamber 20 becomes thoroughly dried it may be removed and the chamber filled with wet material at which time the chamber 19 will contain the dryest material and the chamber 20 the wettest material. leading to the chamber 20 is then closed and that leading to the cha1nber'19 is opened while the discharge opening 41 leading from the chamber 21 is closed and that leading from the chamber 20 is opened. Upon continued operation there will be not only the local circulation set up as heretofore de scribed but a continuous progressive circulation through the chambers beginning with the chamber 19 havingthe dryest material therein and ending with the chamber. 20 having the wettest material therein. The chambers may thus be emptied and filled progressively as the drying proceeds and at The inlet valve 39 all times there will be both a local circulation indicated by the dotted lines and the progressive circulation through the series of chambers, which progressive circulation always starts with the chamber having the dryest material therein, and ends with the chamber having the wettest material therein.

Another advantage gained from this structure is that each windwheel has to overcome only the resistance of its local circulation and, therefore, it will not be necessary for the windwheels to operate under such high vacuum as would be the case in the construction shown in Fig. 1. The apparatus shown in Fig. 2, therefore, can be operated with a much less consumption of power than one such as shown in Fig. 1. Practical tests in dryers have shown that of two dryers of the same size, one constructed as shown in Fig. 1 andthe other as shown in Fig. 2, a dryer as illustrated in Fig. 2 will require only about one-half'the power that is required to operate the dryer constructed in Fig. 1.

I claim:

1. A drying apparatus comprising a plurality of drying chambers, a heating chamher for each drying chamber, each heating chamber communicating with its drying chamber at both the top and the bottom and also communicating with an adjacent drying chamber, a blower for each drying chamber by which a local circulation is established through said drying chamber and corresponding heating chamber, each of the drying chambers having an inlet opening, and an outlet or discharge opening, and closures by which said openings may be independently opened or closed, whereby in addition to said local circulation there will be a progressive displacement of air from the open inet through the connected chambers to the open outlet.

2. A drying apparatus comprising a plurality of heating ehambers each having an inlet and an outlet with closures for the inlets and outlets which may be independently opened or closed and by means of which the inlet of any heating chamber and the dis- .charge from an ad acent heating chamber may be opened, a drying chamber for each heating chamber, and means to establish a local circulation of air through each drying chamber and its corresponding heating chamber and aso to produce a progressive displacement of air from the open inlet through the drying chambers and heating chambers in succession to the open outlet.

In testimony whereof, I have signed my name to this specification.

HERMANN HAAS.