US2791038A

US2791038A - Drainage device or apparatus for steam-heated drying cylinders

Info

Publication number: US2791038A
Application number: US383153A
Authority: US
Inventors: Adam E Armstrong
Original assignee: Armstrong Machine Works
Current assignee: Armstrong Machine Works
Priority date: 1953-09-30
Filing date: 1953-09-30
Publication date: 1957-05-07
Anticipated expiration: 1974-05-07

Description

y 7, 1957 A. E. ARMSTRONG 2,791,038

DRAINAGE DEVICE OR APPARATUS FR STEAM-HEATED DRYING CYLINDERS i Filed Sept. '30, 1953 nited States atentO DRAINAGE DEVICE R APPARATUS FOR STEAM-HEATED DRYING CYLINDERS Adam E. Armstrong, Three Rivers, Mich, assignor to Armstrong Machine Works, Three Rivers, Mich.

Application September 30, 1953, Serial No. 383,153

12 Claims. (Cl. 34-125) This invention relates to improvements in drainage devices or apparatus for steam-heated drying cylinders.

The main objects of this invention are:

First, to provide a structure for draining or removing condensate from steam-heated drying cylinders or drums which is effective at various speeds of cylinder or drum rotation.

Second, to provide a structure for draining or removing condensate from steam drying cylinders including a siphon tube and a scoop associated therewith in a manner and of a capacity to result in the discharge of water during a substantial portion of the revolution of the cylinder.

Third, to provide a device of this type which is very simple in structure and operates effectively through a Wide range of operating conditions.

Fourth, to provide a siphon type drainage device which is well adapted for embodiments in web drying cylinders or drums, for example, such as are employed in drying of webs of paper.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is defined and pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a fragmentary view partially broken away and partially in section on a line corresponding to line 1-1 of Fig. 2 of a drying cylinder or drum embodying my invention with certain parts shown conventionally.

Fig. 2 is a fragmentary view partially in transverse section on a line corresponding to line 22 of Fig. 1, parts beng shown in one position by full lines and in another position by dotted lines.

Fig. 3 is a fragmentary view of a slightly modified form or embodiment of my invention.

My invention relates to the type of apparatus or devices for removing condensate from drying cylinders or drums which is generally designated as the siphon type. However, the action or principle of my invention is not purely a siphonic action although pressure differential does enter into the functioning thereof.

. My present invention is in some respects an adaptation of and improvement upon the device of the invention disclosed in the Armstrong and Thor Patent No. 2,297,094, issued September 29, 1942.

Drying drums or cylinders are operated at various surface speeds ranging from 200 f. p. m. to 1500 f. p. m. This variation in speed results in great variation in the placement or action of the condensate water Within the drum. With certain siphon types of devices in which the siphon pipe is stationary relative to the rotation of the drum, condensate can be removed during the lower speed but when the surface speed of 600 f. p. in. per minute is reached the condensate removal is greatly reduced owing to the water being carried upon the walls of the cylinder and a considerable amount of water must accumulate before there is any in the bottom of the drum so that the siphon pipe can remove it. This cuts down the drying ice capacity of the cylinder or drum and also the horse power required to drive it is increased.

With revolving types of siphons very limited amounts of water can be removed at loW speed because the intake of the siphon is submerged in the Water collected at the bottom only a very limited portion of each revolution. This revolving type is eflicient within limits at speeds at or over 1000 f. p. m. where the water rims all the way around the cylinder but in that case efiiciency is cut down because of a substantial layer of water being required before it can be picked up. The structure of the aforesaid patent overcomes some of these conditions or objections but the present invention is a substantial improvement thereover in the matter of effective removal of condensate.

Referring to the accompanying drawing, 1 represents the drying cylinder or drum of a paper web drying ma chine or the like. It will be understood that these cylinders or drums vary considerably in structure but the illustration shows the desired relation of the parts. The drum is rotatably supported and is driven by a belt 2 and provided with a steam inlet connection 3.

The siphon tube 4 comprises a horizontal portion 5 disposed axially of the drum and a portion 6 disposed radially thereof, these being connected by the coupling 7 which is a 1" type and carries the pipe or counterbalancing rod 8 disposed in opposed relation to the radial intake portion 6 and provided with a counterbalancing Weight 9.

The scoop designated generally by the numeral 10 is of substantial width and faces in the direction of rotation of the cylinder, this being clockwise as viewed in Fig. 2 of the drawing. The scoop comprises the rearwardly tapered side walls 11 and a rearwardly inclined top wall 12, the rear edge 13 of which is disposed closely adjacent to the inner surface of the cylinder providing an elongated slit-like discharge opening 14 or elongated head 15 of the siphon tube. This elongated head of the siphon tube constitutes a discharge chamber for the scoop and desirably corresponds in length to the width of the scoop. The portion of the inner surface of the cylinder embraced by the walls 10 and 11 constitutes the bottom or outer wall of the scoop, the term bottom being used in a manner distinguished to the top wall 12.

The scoop is fixedly secured to the inner surface of the cylinder by means of brackets 16 and the rearwardly projecting flange 17 of the rear Wall 18 of the chamber 15. The top wall 19 of the siphon tube head or scoop discharge chamber 15 has a coupling member 20 disposed centrally thereon and which telescopingly receives the intake portion 6 of the siphon tube. A packing 21 is provided within the gland 22 which is threaded upon the coupling member 20.

As the cylinder rotates, water is picked up by the scoop as indicated at 23. With the cylinder rotating at relatively low speed considerable water is carried by the scoop and discharged for approximately one-half the revolution of the cylinder. The scoop is of such capacity that substantial amounts of Water may be picked up at each revolution and is effectively discharged through the slitlike opening 14, that is, the siphoning action may continue throughout the major portion of the upstroke of the scoop which greatly increases the capacity and efficiency of the apparatus. Highly desirable results are secured when the edge 13 of the top wall is spaced A of an inch from the inner surface of the cylinder.

in the modification shown in Fig. 3 a groove-like sump 24 is formed in the cylinder Wall longitudinally of and below the rear edge of the top wall 12 of the scoop. The rear edge of the top wall, however, is so related .to the sump as to provide a restricted slit-like space 25 for the discharge of the contents of the scoop into the siphon 3- tiibe head or scoop discharge chamber 15. With the sump practically all water or condensate is removed al.- though the apparatus is practical without the sump.

,l have illustrated and described my invention in a highly practical embodiment thereof. 1 have not attempted to illustrate certainrefinements or embodiments which I ,Qconteri'lplate as it 'is believed that those skilled Cinthe art will be able'to embody or adapt my invention asrnay'be desired.

Having thus described my invention, what I claim as new anddesire to secured'by Letters Patent is:

'1. The combination with a rotatable drying cylinder provided with a steam supply connection, of a siphon tube irotatingwith the cylinder and comprising a radially disjposed portion and an axially disposed portion, a scoop opening in the direction ofrotation of the cylinder and ,disposed on the inner side of the cylinder with the inner surface of the cylinder constituting the bottom of the scoop, the scoophaving side walls and a rearwardly incliried top wall, the space between the rear end of said scoop top wall and theinner surface of the cylinder being of the order of of an inch, said scoop having a discharge chamber extending longitudinally thereof and de- {fined by a rear wall spaced from but adjacent to the rear edge of the scoop top wall, and a top wall spaced from andoverhanging the rear portion of the scoop top wall, a discharge nipple with which the radially disposed porition of said suction tube has telescoping engagement dis posed centrally and radially of said discharge chamber top wall and a packing for said suction tube including a gland threaded upon said nipple.

2. The combination with a rotatable drying cylinder provided with a steam supply connection, of a siphon tube rotating withthc cylinder and comprising a radially disposed portion and an axially disposed portion, a scoop opening in'the direction of rotation of the cylinder and disposed on the inner side of the cylinder with the inner surface of the cylinder constituting the bottom of the scoop, the scoop having side walls and a rearwardly inclined, top Wall, said scoop having a discharge chanr bcrextending longitudinally thereof and defined by a rear wall spaced from but adjacent to the rear edge of thescoop top wall, and a top wall spaced from and overhanging the rear portion of the scoop top wall, a discharge nipplewith which the radially disposed portion of said suction tube has telescoping engagement disposed centrally and radially of said discharge chamber top wall, and a packing 'for said suction tube including a gland threaded upon said nipple.

'3. The combination with a rotatable drying cylinder providedwith a steam supply connection, of a siphon tube rotating with the cylinder, a scoop opening in the direction of rotation of the cylinder anddisposed on the inner side of the cylinder with the inner surface of the cylinder constituting the'bottom of the scoop, the scoop having side walls and a rearwardly inclined topwall, the space between the rear edge of said scoop top wall and the inner surface of the cylinder being of the order of of an inch, said scoop having a dischargefchamber extending longitudinally thereof and to which said siphon tube is connected and defined by a rear wall spaced from but adjacent to the rear edge of the scoop top wall, and a top wall spaced from and overhanging the rear portion of the scoop top wall.

4. The combination with a rotatable drying cylinder provided with a steam supply connection, of a siphon tube rotating with the cylinder, a scoop opening in the directionof rotation of the cylinder and disposed on the inner side of the cylinder with the inner surface of the cylinder,

, rear edge of the scoop top wall, and a top wall spaced from and overhanging the rear portion of the scoop top wall.

5. The combination with a rotatable drying cylinder provided with a steam supply connection, of a siphon tube rotating with the cylinder, a scoop opening in the direction of rotation of the cylinder and disposed on the inner side of the cylinder with the inner surface of the cylinder constituting the bottom of the scoop, the scoop having side walls and ,a rearwardly inclined top wall, said scoop having a discharge chamber extending longitudinally thereof and to which said siphon tube is connected and defined by a rear wall spaced from but adjacent to the rear edge of the scoop top wall, and a top wall spaced from and overhanging the rear portion of the scoop top wall, the cylinder wall having a longitudinally extending groove like sump aligned with the rear edge of said top wall.

6. The combination with a rotatable drying drum having a steam supplyconnection, of a siphon tube having a radially disposed intake portion, a scoop facing in the direction of rotation of the drum to rotate therewith, the inner side of the drum constituting the bottom of the scoop, the scoop having a rearwardly and outwardly inclined top wall terminating closely adjacent to the inner surface of the drum, the drum having a longitudinally extending groove-like sump aligned with and into which the rear edge of the said scoop top wall extends, and an elongated chambered siphon tube head member to which said scoop delivers.

7. Thecombination with a rotatable drying drum hav ing a steam supply connection, of a siphon tube, a scoop facing in the direction of rotation of the cylinder and to rotate therewith and having a rearwardly and outwardly inclined top wall terminating closelyadjacent to the inner surface of the drum, the drum having a longitudinally extending groove-like sump aligned with and into which the rear edge of the said scoop top -wall extends, and an elongated 'head for said siphon tube to which said scoop delivers.

8. The combination with a rotatable drying drum having a steam supply connection, the inner surface of the drum being cylindrical and withoutobstructions affecting the gravitational and centrifugal distribution of condensate from end to end thereof of a siphon tube, a scoop facing in the direction of rotation of the cylinder and rotating therewith, the inner Side of the drum constituting the bottom of the scoop, the scoop having a rear wardly and outwardly inclined top Wall .disposed with its rear edge closely adjacent to the inner surface of the drum providing an elongated slot like scoop discharge Opening, and an elongated chambered head member for said siphon tube to which said scoop discharges through said slot-like opening, the capacity of the scoop being substantially greater thanthat ofsaid discharge opening so that condensate picked up by-the scoop may discharge through its said discharge openingfor a substantial portion of a revolution of the cylinder on the upsweep movement of the scoop.

9. The combination with a rotatable drying drum having a steam supply connection, the inner surface of the drum being cylindrical and without obstructions atfecting the gravitational and centrifugal distribution of condensate from end to end thereofiof a siphon tube having a radially disposed intake portion, a scoop opening in the direction of the rotation'of the drum and rotating there with, the inner side of the ,drum constituting .the bottom of the scoop,,,the scoop comprising parallel sidewalls, and a rearwardly and outwardly inclined top wall terminating adjacent to the 'inner surface of the drum and coacting-therewith to provide aslitdike discharge opening of the order of 1 of an inch, said scoop having an ated chambe ed discharge ahead correspo d ng in length and into which s id sli -lik op ning discham said siphon tube being connected centrally to said discharge head.

10. The combination with a rotatable drying drum having a steam supply connection, the inner surface of the drum being cylindrical and without obstructions affecting the gravitational and centrifugal distribution of condensate from end to end thereof, of a siphon tube having a radially disposed intake portion, a scoop opening in the direction of the rotation of the drum and rotating therewith, the inner side of the drum constituting the bottom of the scoop, the scoop comprising parallel side walls, and a rearwaro'ly and outwardly inclined top wall terminating adjacent to the inner surface of the drum and coacting therewith to provide a slit-like discharge opening, said scoop having an elongated chambered discharge head corresponding in length and into which said slitlike opening discharges, said siphon tube being connected centrally to said discharge head.

11. The combination with a rotatable drying drum having a steam supply connection, the inner surface of the drum being cylindrical and Without obstructions affecting the gravitational and centrifugal distribution of condensate from end to end thereof, of a siphon tube, a scoop opening in the direction of the rotation of the drum and rotating therewith, the inner side of the drum constituting the bottom of the scoop, the scoop comprising side walls, and a rearwardly and outwardly inclined top wall terminating adjacent to the inner surface of the drum and coacting therewith to provide a slit-like discharge opening of the order of V of an inch, said scoop having an elongated chambered head to which said siphon tube is connected and into which said slit-like opening discharges.

12. The combination with a rotatable drying drum having a steam supply connection, the inner surface of the drum being cylindrical and without obstructions affecting the gravitational and centrifugal distribution of condensate from end to end thereof, of a siphon tube, a scoop opening in the direction of the rotation of the drum and rotating therewith, the inner side of the drum constituting the bottom of the scoop, the scoop comprising side walls, and a rearwardly and outwardly inclined top wall terminating adjacent to the inner surface of the drum and coacting therewith to provide a slit-like discharge opening, said scoop having an elongated chambered head to which said siphon tube is connected and into which said slit-like opening discharges.

References Cited in the file of this patent UNITED STATES PATENTS 1,483,343 Gladin Feb. 12, 1924 2,297,094 Armstrong et al. Sept. 29, 1942 2,420,824 Hornbostel et al. May 20, 1947 2,521,371 Hornbostel et al. Sept. 5, 1950 2,677,898 Ohlson et al. May 11, 1954