US 3425488 A
Description (OCR text may contain errors)
Feb. 4, 1969 K, A. a.4 JARREBY 3,425,488
- HEAT EXCHANGE -ROLL y Filed April 17. 1967 sheet of 4 INVENTOR K. A. B. JARREBY HEAT EXCHANGE ROLL Feb. 4, 1969 Sheet Filed April 17. 1967 INVENI'OR F eb. 4, 1969 K. A. B. JARREBY HEAT EXCHAQANGE ROLL Filed April 17,- 196'? Sheet of 4 Fig. 4
Fel* 4f 1969 K. A. a. JARREBY I 3,425,488
HEAT EXCHANGE ROLL Sheet Filed April 17, 1967 l www@ United States Patent O 5,777/ 66 U.S. Cl. 165-90 12 Claims Int. Cl. FZSd 11/00; B01d 1/22; F28f 5 02 ABSTRACT F THE DISCLOSURE The present invention relates to a heating or cooling roller having an internal mantle and an external mantle forming between them an annular space in which a guide rail is arranged to guide the stream of heating or cooling medium along a helical path in such a way that the effect of the roller is increased.
The present invention has reference to rollers of the kind provided with at least one trunnion and an inlet and an outlet to a space for a heating or cooling medium in liquid or gaseous state, said space situated between an external mantle and an interna-l mantle, gaskets arranged between said mantles at the ends of the rollers. So as to obtain a good heat transmission effect between the medium streaming through the annular space and the external mantle, there is in the space arranged a guide ange forcing the medium stream to follow a long path through the space.
The purpose of the present invention is to arrange the guide ange in such a way that there is obtained the best possible heat transmission effect and there should also be rendered possible, at need, to change the external mantle for another without need of a change also of the internal mantle, the guide flange on the same or the bearing shaft trunnions. The improvement in the invention is to be seen therein that there is externally of the internal mantle about the same arranged a carrying layer in which engages the radially inner border of a guide rail arranged edgewise and bent to form a helice, said rail being inserted between the carrying layer and the external mantle in such a way that the latter by the rail is supported at the contact place between the mantle and the rail.
At the manufacture of the roller, the internal mantle is according to the invention externally provided with a preferably heat insulating carrying layer for the guide rail which is arranged about the internal Imantle in such a way that the radially inner border of the rail engages the carrying layer and the helical rail thus formed is given an outer diameter which to a small extent (e.g. l-3 millimetres) exceeds the inner diameter of the external mantle whereupon the latter is endwise forced on the guide rail such that the turns of said rail are bent somewhat in the lateral direction and then with a certain radial pressure abuts internally against the outer mantle. Due to the fact that the rail in mounted position with a certain resiliency is pressed against the inside of the external mantle the latter will along the whole of the contact place be supported which makes it possible to choose, for the external mantle, a sheet thickness which is smaller than the one previously needed. Due to the resilient pressing of the rail against the external mantle there is also obtained a suicient tightening so as to force the Imedium streaming through said annular space to follow the windings of the guide rail. The good contact between the rail and the external mantle contributes to a good heat transfer from the rail to the external mantle or when the roller ice is used as a cooling roller from the external mantle to the rail and the streaming cooling medium.
According to a preferred embodiment of the invention the carrier layer comprises a helical means which is adapted to be arranged on the internal mantle and is provided with notches for engagement with the radially inner border of the edgewise arranged guide rail. Preferably, the helical means comprises a hose which after the mounting can be inflated by means of compressed air or be filled with water, oil or the like. The hose may be provided with a notch reinforced by a metal rail and adapted for taking up the radially inner border of the guide rail.
In the following the invention will be elucidated with reference to the attached drawings. In the drawings:
FIG. l shows a longitudinally section side elevation of a roller according to the invention,
FIG. 2 is an end elevation of the roller,
FIG. 3 shows on an enlarged scale a vertical section through one end of the roller during its mounting,
FIG. 4 is a side elevation shown partly in section of a roller according to another embodiment of the invention,
FIG. 5 shows on an enlarged scale a part of the roller in longitudinal section, and
FIG. 6 is a perspective view of the external mantle illustrating the arrangement of the guide rail on the helical means.
The roller shown in the drawings is intended to be used as a cooling roller and has an outer diameter of e.g. about 500 millimetres and with water as cooling medium. The external mantle 1 and the internal mantle 2 of the roller are supposed to be manufactured from a rather thin sheet (with a thickness of e.g. 4-6 millimetres) which has been rolled to cylindrical shape with a welded longitudinal joint. The joint is ground after the welding in such a way that the mantles 1 and 2 be externally smooth. Alternatively, the mantles may after the welding be exposed to a rolling operation in such a way that they be practically completely cylindrical. The shaft trunnions 3 of the roller are attached, preferably by welding, by means of spokes 4 such that the space defined yby the internal and external mantle is in communication therewith. The shaft trunnions 3 are provided with a bore 5 in communication with the annular space 6 between the mantles 1 and 2 by means of tubes 7 which also serve as spokes.
In the space 6 between the mantles 1 and 2 there are at both ends of the roller inserted two transversely slotted `spring rings 8, 9 of different diameters and of steel or an analogous material. The greater spring ring 8 has an external diameter which only slightly exceeds the inner diameter of the external mantle 1. The smaller spring ring 9 has an inner diameter which only slightly exceeds the outer diameter of the internal mantle 2. The surfaces 10 and 11 radially turned towards each other of the spring rings 8, 9 are conical in such a way that the axially inner ends of the rings are thicker than their outer ends. In the space between the spring rings 8, 9 there is inserted a set ring 12 the radially outer and inner surfaces of which are conical with a conicity corresponding to the conicity of the surfaces 10, 11 on the spring rings 8, 9. The set ring 12 is provided with a number of bores 13 the axis line of which is parallel to the longitudinal line of the roller. The bores 13 are passed, with a great play, hy bolts 15 provided with heads 14, said bolts adapted to be screwed into a nut ring 16. Between the nut ring 16 and the spring rings there is arranged a gasket 17 of rubber or another suitable elastic material.
There is externally of the internal mantle 2 according to FIGS. 1 and 2 arranged a carrying layer 18 of any suitable material having a rather good supporting capacity and also heat insulation. Such a material may comprise e.g. synthetic resin which is reinforced by glass fibres.
Such a resin may comprise c g. a polyester resin. This material is wound in strips about the internal mantle in such a way that there is formed a rather smooth cylindrical mantle. About this plastic mantle there is wound, arranged edgewise, a strip of steel, preferably of spring steel in such a way that it extends helically from one end of the roller to the other end of the same. This guide rail 19 is given an external diameter which somewhat, e.g. with 1-3 millimetres, exceeds the inner diameter of the external mantle 1. In the space between two adjacent turns of the guide rail 19 there is arranged a further quantity of synthetic resin reinforced by glass fibres such that the rail 19 ywith its radially inner edge 20 is embedded in the carrying layer 18.
At the mounting of the roller, the external mantle 1 is put endwise over the internal mantle 2 (see FIG. 3) whereat the turns of the guide rail 19 are bent somewhat resiliently outwards in lateral direction. When the external mantle has been moved to its exact position on the internal mantle 2 (FIG. l) in which position the guide rail with a certain spring resiliency is pressed against the inside of the external mantle, the bolts are tightened. The rings 8 and 9 are then caused to expand against the external mantle 1 and the internal mantle 2, respectively, and at the same time there is obtained the necessary tightening at the ends of the roller by means of a compression of the gasket rings 17. The cooling medium flows into bore 5 of one of the shaft trunnions 3 helically through the space 6 between the carrying layer 18 and the external mantle 1 and out through the opposite shaft trunnion 3. The channel defined by the carrying layer 18, the guide rail 19 and the external mantle 1 may be shaped with a rather small cross section so that the streaming speed of the cooling medium could be kept at a rather high value. Due to this and the good contact between the guide rail 19 and the external mantle 1, the heat transfer to the cooling medium will be good.
lFor a change of the outer mantle 1, the latter is pushed off in the same direction as it is put on the internal mantle 2.
According to the embodiment shown in FIGS. 4-6 the carrying layer 18 may comprise helical means 21. These means 21 may comprise rings laid against each other or as shown in FIG. 6 a helically wound hose which is arranged on the internal mantle 2. The guide rail 19 abuts with its radially inner edge 20 in a notch 22 in the helical means 21 (the hose). The notch 22 is preferably reinforced by means of a metal rail 23 with a U-shaped cross section. With its radially outer border 24 the rail 19 is inserted in a helical notch 25 at the inside of the external mantle 1.
At the mounting one proceeds in the following manner (in this connection see in particular FIG. 6). First the guide rail 19 is screwed into the external mantle 1 and thereupon the helical hose 26 is screwed in such a way therein that the rail 19 catches with its radially inner edge into the notch in the hose. The hose 26 has at the mounting preferably no internal pressure but is released such that the internal mantle can easily be pushed in. By means of an inflating valve 27 (see FIG. 5) the interior 28 of the hose 26 is `filled with a pressure medium, eg. compressed air or an hydraulic medium, such as water or oil. The notch 22 is then pressed with the reinforcement rail 23 against the radially inner edge 20 of the guide rail 19 and the latter is in turn pressed with its radially outer edge 24 against the external mantle 1 such that the latter is given a better internal support. Due to this pressing there is obtained also a better tightening at the outer edge 24 as well as the inner edge 20 of the rail 19 in such a way that the medium streaming through the space 2t) is forced to follow the helical path formed by the guide rail 19 between the mantlcs 1 and 2. No leaking occurs between the different turns of the path. So as to ensure the correct position of the helical turns of the hose 26 on the internal mantle 2 one can arrange attachment screws 29 with nuts 30 on the inner end of the screws. It is also possible to obtain, by means of the spring rings 9, such a support of the ends of the helical means 21, situated at the ends of the roller, thereby that all the winding turns of the same are kept in position on the internal mantle 2 in which case one cable is to be mounted only after the filling with the pressure medium. In this case the attachment screws 29 may be dispensed with and the tightening is facilitated.
The invention has been described in the aforegoing for purposes of illustration only and is not intended to be limited by this description or otherwise except as defined in the appended claims. Thus, the different parts of the roller may be modified in many ways without departure from the inventive idea. On the drawings the roller is shown as provided with only one guide rail 19. However, many such may be employed in which case many channels will extend helically inside the external mantle 1. lInstead of a steel or a metal, a strip of a resilient synthetic resin, e.g. polyethylene, may be used as a material for the guide rail 19. The carrying layer 18 can be shaped also of rubber. Of course, the invention may also be carried into effect by heating rollers in which the heat transmitting medium may comprise hot water or steam. For the helical means 21 it is possible to choose as material rubber of car tire quality or of a hardness which is somewhat greater than of such a quality, e.g. 70 shore. Further, one may also use some kind of a synthetic rubber which in many a case with advantage may be reinforced by glass fibres. The helical means must not be hollow but such a shape facilitates the mounting as the means in released state are then easier to insert in correct position.
What I claim is:
1. A roller comprising an external mantle, an internal mantle spaced from said external mantle to form an annular space between said mantles, an inlet and an outlet to said space for a medium in liquid or gaseous state streaming through said space, a guide rail located in said space for guiding said medium through said space, a carrying layer for said rail arranged externally on said internal mantle in engagement with the radially inner edge of said guide rail, said guide rail extending between said carrying layer and said external mantle to support said external mantle.
2. A roller as set forth in claim 1 wherein said rail is helical.
3. A roller as claimed in claim 1 wherein said guide rail is a strip of steel.
4. A roller as claimed in claim 1, wherein said guide rail is a strip of resilient synthetic resin.
5. A roller as claimed in claim 1, wherein said carrying layer is a synthetic resin.
6. A roller as claimed in claim 5 wherein said resin is reinforced by glass fibres.
7. A roller as claimed in claim 1, wherein said carrying layer is rubber.
8. A roller as claimed in claim 1, wherin said carrying layer comprises a helical means arranged on said internal mantle having notches for engagement with the inner edge of said guide rail.
9. A roller as claimed in claim 8 wherein said helical means is hollow and infiatable.
10. A roller as claimed in claim 8, wherein said helical means comprises a hose.
11. A roller as claimed in claim 10 wherein said hose has a notch, a metal rail reinforcing said notch, said notch engaging the radially inner edge of said guide rail.
12. A roller as claimed in claim 1, wherein said external mantle is provided on the inside with a helical notch for engagement with the radially outer edge of said guide rail.
(References on following page) 5 6 References Cited ROBERT A. OLEARY, Primary Examiner. UNITED STATES PATENTS T. W. STREULE, JR., Assistant Examiner. 1,583,333 5/1926 Bigum 165-91 2,498,662 2/1950 Euby 16S- 89 U-S- Cl- XR 2,915,292 12/1959 Gross 165-89 159-11