US3446275A - Cooled roller - Google Patents

Description

y 1969 TAKAAI KUROKAWA ET AL 3,446,275

COOLED ROLLER Filed May 18, 1967 FIG. 2

United States Patent 3,446,275 COOLED ROLLER Takaai Kurokawa, Chigasaki-shi, and Mitsugu Fukuda, Kawasaki-shi, Japan, assignors to Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki-shi, Japan, a jointstock company of Japan Filed May 18, 1967, Ser. No. 639,380 Claims priority, application Japan, Sept. 10, 1966, 41/ 85,305 Int. Cl. F28d 21/00; C03b 13/00 US. Cl. 165-90 3 Claims ABSTRACT OF THE DISCLOSURE This invention relates to a roller and more particularly a roll operating at elevated temperature and requiring adequate cooling.

For example, the so-called ribbon type glass bulb blowing machines utilize a pair of rotating feed rolls or rollers to form into a ribbon shaped glass blank a flow of molten glass supplied from an orifice through the bottom of a glass melting furnace. The glass blank is then fed to a plate conveyor and blown into a plurality of bulbs. As these feed rolls are heated by molten glass it is necessary to suitably cool them by a coolant such as water.

In one form of a prior liquid cooled feed roll, cooling liquid is supplied to the roll in the radial direction from one end of a coolant supply shaft extending through the shaft of the roll. With this construction, it was impossible to obtain uniform distribution of flow velocity within the roll as well as uniform cooling thereof.

It is an object of the present invention to provide an improved flow path for cooling liquid within the roll or roller whereby to obtain uniform flow velocity of the cooling liquid and uniform cooling effect of various parts of the roller.

Another object of this invention is to provide a novel liquid cooled roll in which one or more solid metal cores of good heat conductive material are housed in the roller to increase the peripheral speed of the cooling liquid which flows in contact with the inner surface of the roller thus increasing the cooling effect and to equalize the temperature of the cooling liquid.

Briefly stated, according to a preferred embodiment of this invention there is provided a roller comprising a shaft, a pair of end plates secured to the shaft, a hollow cylindrical drum clamped between the end plates, a core member made of a solid good heat conductive material and contained in a space defined by the end plates and the drum, a plurality of first radial passages radially extending through the core member at an intermediate point between opposite ends thereof, a plurality of second radial passages on the opposite ends of the core member, a cooling liquid supply passage extending through the shaft to supply cooling liquid to each of the first passage and an outlet passage extending through said shaft to exhaust cooling liquid through the second passages, the first and second radial passages being in com- "ice munication through an annular flow path between the drum and core member.

For a more complete understanding of the invention, reference may be had to the following description taken in connection with the accompanying drawing in which:

FIG. 1 shows a longitudinal sectional view of a feed roller shown in FIG. 2, taken along a line II; and

FIG. 2 shows a cross sectional view of the feed roller, taken along a line II-II in FIG. 1.

The feed roller shown in the accompanying drawing comprises a shaft 1 provided with an axial cooling liquid inlet passage 2 and an axial outlet passage 3, the inlet passage being communicated with a plurality of radial openings 4 equally spaced around the periphery of shaft 1.

A pair of end plates 5 are secured on shaft 1 at points equally spaced from said openings 4 to clamp therebetween a roller drum 6, thus forming a roller. The roller contains a pair of generally annular core members 7 constructed as follows. Each core member includes a central bore 7a adapted to receive shaft 1, a counterbored recess 7b on the inner end and a countersunk part 7c contiguous therewith. Between adjacent core members are a plurality of guide vanes 7d which may be integral with one of the solid core members and slightly inclined with respect to the radial direction to define similarly inclined flow passages between vanes 7 which induce circumferential flow of the cooling liquid, as shown in FIG. 2. An annular ring 8 including a number of spaced openings 8a in alignment with said openings 4 is seated in the counterbored recesses 7b. On the outer end surface of each core member 7 are provided a plurality of radial grooves 9 angularly displaced from said openings 4. These grooves 9 communicate with the inclined flow passages between vanes 7d through an annular fiow passage between roller drum 6 and core members and also communicate with the outlet passage 3 respectively through ducts 10 in the axial direction and radial openings 11 which are provided for shaft 1 between adjacent openings 4. The core members 7 are secured to end plates 5 by means of dowel pins 12 and the like so that they can rotate with the shaft.

Alternatively, two core members 7 may be united into an integral member, in which case, instead of providing guide vanes 7d, a plurality of circumferentially spaced and slightly inclined openings are provided to communicate with openings 4.

In operation, cooling liquid supplied to inlet passage 2 flows radially outwardly through openings 4 and passages between guide vanes 7d, then axially through a space between core member 7 and drum 6, radially inwardly through grooves 9 at the outer ends of the core member, axially through ducts 10, and through radial openings 11 to the outlet passage 3.

With the construction as above described, stagnation of the How of cooling liquid in the roller is eliminated, and owing to the circumferential flow of the cooling liquid afforded by inclined vanes 9d, the cooling effect of the cooling liquid becomes substantially uniform throughout the roller, so that the various parts of the roller heated by molten glass are cooled uniformly.

More particularly, the cooling liquid having a relatively large specific heat is brought into positive contact with the inner surface of the roller by said circumferential flow to effectively remove heat therefrom, while the solid metal core members having relatively high heat conductivity and large heat capacity function to equalize the temperature of the cooling liquid and hence the temperature of the roller surface.

While the invention has been shown and described in connection with a preferred embodiment thereof, this invention is not limited thereto and includes any modifications and alternations as fall within the true spirit and scope of this invention.

What is claimed is:

1. A roll comprising, a driven shaft, a pair of end plates secured to said shaft for rotation therewith, a hollow cylindrical drum clamped between said end plates, a solid core member mounted on said shaft made of a heat conductive material and contained in a space defined by said end plates and said drum, said core being spaced radially from said drum to form an annular flow path, between it and said drum, means defining a first plurality of radial passages extending through said core member at a point intermediate opposite axial ends thereof, said radial passages being inclined with respect to the radial direction, means defining a second plurality of radial passageson the opposite ends of said core member, a cooling liquid supply passage axially extending in said shaft to supply cooling liquid to each of said first plurality passages,'and an outlet passage extending axially in said shaft to exhaust cooling liquid from said second plurality of passages, the first and second pluralities of radial passages having communication through said annular flow path.

2. A roll according to claim 1", wherein said core member is divided into two axially spaced identical sections,

' radial passages.

References Cited UNITED STATES PATENTS 1,939,967 12/1933 Fox et al. 'l6590 2,956,348 10/1960 Mueller 16589 X FOREIGN PATENTS 1,000,235 8/1965 Great Britain.

ROBERT A. OLEARY, Primary Examiner. T.- W. STREULE, Assistant Examiner.

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