US764393A - Piled vacuum evaporating apparatus. - Google Patents

Description

No. 764,393. PATENTED JULY 5, 1904. T. SUZUKI.

PILED VACUUM EVAPORATING APPARATUS. APPLiOATION FILED MAR.10. 1004.

no MODEL. 3 SHEETS-SHEET 1.

No. 764,393. PATENTED JULY 5, 1904. 7 I T. SUZUKI.

PILED VACUUM EVAPORATING APPARATUS.

' APPLICATION FILED MAR 10 1904. N0 MODEL. 3 SHEETS-SHEET 2.

MM 13 esfieg: live 1 fife r7794,

PATENTED JULY 5, 1904.

T. SUZUKI. Y PILBD VACUUM EVAPORATING APPARATUS.

APPLICATION FILED MAR. 10, 1904.

3 SHEETS-SHEBT 3.

' N0 MODEL.

UNITED I STATES Patented July 5, 1904.

PATENT OFFICE.

TOZABURO SUZUKI, or SUNAMURA, JAPAN.

PlL ED VACUUM EVAPORATING APPARATUS.

SPECIFICATION forming part'of Letters Patent N0. T642393, dated July 5, 1904.

Application filed March 10, 1904.-

To all whom it may concern.-

. Be it known that I, TOZABURO SUZUKI, asub ject of the Emperor of Japan, residing at No. 401 J ibeishinden, Sunamura, in the county of Minami-Katsushika, in the Province of Tokio, Japan, have invented certain new and'useful Improvements in Piled Vacuum Evaporating Apparatus, of which the following is a specification.

The invention relates to evaporating apparatus consisting of two sets of vacuum evapcrating-pans placed side by side and having evaporating-surfaces almost as wide as the heating-surfaces and in uniformily distributing the liquid on the heating-surfaces {so as to facilitate and to make complete the process of evaporating by causing the liquid gradually andautomatically to drop; second,lin revolving the distributing-disk so as to cause the liquid to spread uniformly .over the heating-surfaces and to makethe evaporating action complete, the construction of the said distributing-disk being also made very simple; third, in placing one above the other thelayers of the evaporating-surfaces to minimize the spaces.- and. toasimplify the construction and repair and the addition or diminution of the number of the layers; fourth, in preventingthe boiling over of the liquid, and, fifth, in making the evaporation of the liquid complete by utilizing the heat to its fullest extent. f

In the accompanying drawings, Figure 1 is afront elevation of the first evaporating-pan. Fig. 2-is a longitudinal section of the second evaporating-pan. Fig. 3 is a plan view of the apparatus connecting the first and second evaporatingpans. Fig.4 is a transverse section uponline IVIV of Fig; 2. Fig. 5 is a transverse'section upon line V V of Fig. 2, showingthe arrangement of the coils.

itLikenumerals of reference refer to same or charge pipe or draw-01f pipe 3.

Serial 110,197,628. (No model.) 1"

similar parts throughout the specification and drawings. I

The first and second vacuum evaporatingpans being entirely identical in their interior construction, the description of one will suffice for the description of the other, and-numorals upon one may be taken as reference characters for the other.

The evaporating-pan consists of base 1, a

number of superposed drums 11, upper drum 7 and co vcr 21, hermetically secured one above the other in due order. The upper drum 7 is provided with Vacuum-gage 12 and thermometer 13 in order to determine the degree of vacuity and temperature, while each drum 1 1 is provided with peep-window 14, of glass plate, on each opposite side in order to permit examination of the icondition of the interior. One of the drums has a hole bored to receive the air-pipe 15, providedwith an air-cock for the purpose of admitting air into the pan,

While the base 1 and the lowest drum are provided with a water-gageconsisting of glass pipe 43 and 44, connected by cocks 41 42. Through the center of the base rises short verticalshaft 2, hermetically packed by a suitable gland, and alongside said shaft is a liquid-dis- The cover 21 hasthe outlet-port 22 in order to discharge air and vapor from the pan, while cap or baifie23 is suspended from the cover to prevent the liquid from entering theoutlet-port withcthe vapor. I l

The feed-pipe 8 is connected with the upper drum 7 and is attached to the annular liquid-discharge pipe or sprinkler 9, having a number of perforations. The drums 11 are provided with flanges '47 to admit their being placed one uponthe other. The drums have flat bottom 17 in their interior, which in the center of each drum are provided with an annular upwardly-projected flange, so that they Each receiver 17 is provided with discharge-nipple and cock 19,112LV".

may form receivers.

ing handle 18 outside the pan, so as to regulate the quantity of the flowing liquids. Overflow-pipes 20 rise to a distance from the bottom to keep the body of the liquid constant and of suitable depth thereon, the overflow going to a perforated plate or disk beneath.

Receivers in the drums 11 are provided with a number of annular coils 26, which, as shown in Fig. ,5, are connected at one end with steamchamber 27 and at the other with exhaustchamber 28. These chambers send their respective branches 45 46 outside of the pan in order to admit steam into the coils 26 and exhaust it therefrom. As these coils serve the purpose of giving heat to the liquid, they maybe replaced by other multitubular waterheater contrivances.

The upper part of the pan is provided with a rotary distributing plate or disk 30. This distributing-disk 30 is a flat annular vessel having inner and outer flanges 31 32 and is penetrated by a number of conducting-perforations 33, passing directly over the convolutions of the coils 36. These perforations have slightly-upstanding flanges in order to cause the liquid to retain more or less depth in the distributing-disk 39, the overflow going over these flanges down to the next layer or receiver. In the floor of the distributing plates or disks 30 smaller perforations 34, Fig. 4, than the conducting-perforations 33 are provided in order to cause the liquid to continually drip. The perforations 34 being very small, the liquid that'continually flows from above cannot all escape through them, but settles in the disk until it overflows the flanges of the conducting-perforations 33 and is uniformly delivered to the receiver beneath. When the supply of liquid from above is stopped, all the remaining liquid in the disk drips through the small perforations 34 till -the-disks are exhausted in a short time. The inner upstanding. annular edge 31 of the'distributing-disk 30 is provided with arms which are connected with vertical supports or shaftsections 36, provided in the center of the vacuum-pan. These supports are hollow and are perforated all around with steam-conducting perforations 38. Each of these supports is placed on the vertical, shaft 2 one above the other, so as to make them continuous and capable of being revolved by means of dowels 37, connecting the series. A short shaft 24 is fixed to the support 36 of the uppermost distributing-disk 30 and is journaled in the bearing-bar 10, provided in the upper drum of the vacuum-pan 7 In this invention two vacuumpans constructed as in the foregoing paragraphs are installed side .by side. First vacuum -.pan draws in steam from the steam-pipe 4, provided with pressure-gage 6, and exhausts it through the exhaust-pipe 5 after it passes first through the branch pipes 45 to coils 26 and then through the branch pipes 46 to exhaust-pipe 5, the end of which is connected with condenser and air-pump by means of steam-trap. The air-outlet port 22 of the first vacuum-pan is connected with the conducting-pipe 29. The vapor produced in the first pan is led to exhaust-pipe 39 from branch pipes 45 after first reaching coils 26 from conducting-pipe 29 audbranch pipes 45. The extreme end of the exhaust-pipe is joined by the stop-valve 40 with the exhaust-pipe 25 of the second pan and is connected with condenser and air-pump. The outlet 22 of the second pan is connected with condenser and air-pump via exhaust-pipe 25. The discharging-pipe 3 of the first pan is connected with the feeding-pipe 8 via regulating-valve 108,

I while the discharge-pipe 3 of the second pan is connected with exhaust-pump.

Steam-conducting pipe 4, steam-exhausting pipe 5, conducting and discharging pipes 25 and 39 are of the same length or twice the length of the drums with which they are connected, and, as in the case of the drums, they can easily be increased or decreased in length or detached for repair.

Inorderto evaporate liquid by this apparatus, the condenser and air-pump at the ends of exhaust-pipes 25 39 are set in action, by which means the air contained inthe first and second pans is exhausted. Then the regulating-valve 108 of the feeding-pipe 8 is opened to send a suitable amount of liquid to the first pan. Steam of required volume is also sent to the same pan by opening the regulatingvalve 104 of the steam-pipe to heat the coils 26, and gentle rotation is then given to the vertical shaft 2." The liquid passes down through the small perforations of the distributing-pipe 9 to the upper distribu tingdisk 30 and accumulates there until it overflows' the upper edge of the liquid-conducting perforations 33 and drops down equally and uniformly on the different parts of coils 26, which generate suflicient evaporating action, and into the receiver beneath. The vapor ascends through thespace between the inner annular flange 16 of the receiver and the space between the inner edge 31 of the distributing-pan. By opening the cook 19 of the receiver by means of the handle 18 from outside the I pan the liquid in the receiver passes down through the cook 19 into the distributing-diskof the next layer. By these successive operations the liquid finally settles on the base 1, and the amount of settled liquid can be examined by glass tube 43 by opening cocks 41 42, provided to the water-gage.

In order to ascertain the density of liquid passing through the first pan, the cock 19 of the lower layer is closed, while the cock 42 is so adjusted as to be partly closed. The liquid then fills in the water-gage. By opening the cover 44 the pycnometer is inserted in the water-gage or some quantity of the liquid is taken out, and the density can easily be ascertained in that way. After the density of the liquid has been ascertained the cover is closed and the cooks 41 42 are opened.

The vapor produced in the first pan ascends by passing through the spaces between flange 16 of thereceiver and between inner edge3l IIO of the distributin gwdisk 30, through the inner chamber of its support 36 and enters the conducting-pipe29 by wayof the outlet 22. As

a this vapor passes through the coils 26 of the second pan and joins, through exhaust-pipe 39, to the exhaust-pipe 25 of the second pan, thence to be conducted to the condenser,

it therefore by the adjustment of valves 40 the vacuity of the first pan can be made lower in degree than that of thesecond pan." According to actual experiment the proper relative vacuity of the first pan is less than fifteen inches, while the second is not less than twenty. As the relative'degree of vacuityof the first and second pans is different, therefore the liquid settled on the base of the first pan can automatically be sent in suitable quantity by the proper adjustment of the regulating-valve 208 from discharging-pipe 3 to the second pan and through the feeding-pipe of. the second pan. The said liquid in the second pan having been subjected to the same action as when it was in the first pan, it settles on the base 1 and is then discharged by pump through the pipe 3. When, according to the kind of liquid to be treated and convenience, distributing-disk 30 is not to be rotated, the revolving motion of the vertical shaft 2 is stopped and the cooks 19 of the receivers closed. Then the liquid first settling in the chamber overflows the up per edge of pipe 20 and passes down to be subjected in the receiver to the action of the heat generating from the whole parts of the coils and evaporating from the Whole surface of the chamber. Sometimes the distributingdisk 30 may be dispensed with.

The present invention being devised and put in operation as aforementioned, the evaporation of liquid is exceedingly rapid, for not only does the entire surface of the coils 26 constitute heating-surface, and the evaporatingsurface therefore practically equal that of the heating-surface, but the liquid is also constantly and uniformly spread over the coils 26 and is made to fall, subjecting automatically and in regular succession to the same operation one portion after another. The distributing-disk is made to revolve constantly, so as to cause the liquid to spread uniformly and in different positions over theheating-surface of the coils 26. This will make the evaporating action complete. The construction of the distributing-disks 30 is such as to admit of their being placed on the vertical shaft one above the other in a series. Therefore their installation is simple, and no"difiicultyis experienced in bringing about the rotary motion and causing the vapor to ascend. The drums 11,

steam conducting pipe, steam exhausting pipe, 620., being constructed in sections, so that they may be putone above the other, it is possible to add new layers in the minimum space and to produce a maximum evaporating action. Besides they also possess the advantage of simplicity of construction andinstal -be mixed and discharged Witlithe vapor.

lation, as in the case of the distributing-disks,

and are capable of readily adding to or diminreceiving repairs. 5 p

In an ordinary vacuurn-pan the liquid is agitated and bubbled over as a result of boiling, and this priming impedes the action of evaporation, while more or less liquid is liable to In order to prevent this inconvenience, several contrivances are made in ordinary cases; but in the present invention, the liquid being confined to the evaporator, this trouble is re moved and the evaporation can be safely and perfectly made.

ishing the number of layers and of quickly condenser for the first pan, the utilization of the heat is complete.

Having thus fully described my-invcntion, what I claim as new, and desire to secure'by Letters Patent, is- V f 1. The combination, in a vacuum evaporating apparatus, of a receiver, heating mechanism therein, arevolving distributing-disk thereabove, and means for applying liquid to said disk.

2. The combination in a vacuum eva orat- 7 ing apparatus, of a series of I'GCGlVGIS, heattributing disks having overflows arranged above each of the convolutions of sald coils,

and means for supplying liquid to the uppermost of said disks.

5. In a vacuum evaporating apparatus, the combination with rotary dlstributing-disks,

one above another, of a shaft for rotating them,

and supportsections, one to each disk, mount ed upon and detachably secured to said shaft and to each other. I

6. In a vacuum evaporating apparatus, the

combination with rotary distributi1ig-disks,

one above another, of a shaft for rotating them, and tubular support-sections, one to 'eaeh disk, having perforated walls and mounted upon and detachably secured to said sli'aft and to each other. 7. In a vacuum evap'oratlng apparatus, the

combination of a seriesof detachable drums placed one above another, a centrally apertured receiver carried by each drum, aheating-coil in each receiver surrounding the cen tral apcrture,a central verticalshaft, a series of superposed support-sections mounted rior of the casing, a heating-coil in each receiver, a rotary distributing-disk above each receiver, receiving the overflow of the receiver above and having overflows delivering to the heating coils and receiver beneath, and a liquid-spreader, delivering liquid to the topmost disk.

9. In a vacuum evaporating apparatus, the combination of two Vacuum-pans arranged side by side, each having a series of receivers, and heating-coils, therein, an alternating series of rotary distributing-disks receiving from and delivering to' said receivers, drawoff pipes, liquid-supply pipes, and overhead exhaust-pipes, with connecting piping and valves whereby the heated exhaust vapors and gases of the first are directed into the heatingcoils of the second and the liquid products of the first led to the supply-pipe and spreader thereof. 7 p

10. The rotary distributer constructed with flanged overflow-perforations and withsmaller drip-perforations through its flow.

In testimony whereof I aifix my signature in presence of two witnesses.

TOZABURO SUZUKI. Witnesses:

I. V. LILLIE, K. W. Snno.

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