The invention concerns a heat transmission roll for a rotary cylindrical heat exchanger. It is designated for use in rotary exchangers of various types, fitted with a system of channels parallel to the axis of rotation, especially for recuperative exchangers of the air-air type used in ventilation systems.
Known are different types of heat exchangers the structure of which depends on many factors, in particular on the function which they serve and on their location. One of the groups among various types of heat exchanger structure are rotary heat exchangers in which heat is transferred between two streams of fluids differing in temperatures through the walls of the channels in which those fluids flow, parallel to the rotation axis.
Known from patent description PL190740 is an assembly of heat transfer elements for a rotary regenerative heat exchanger comprising a plurality of plates stacked in spaced relationship thereby providing passageways for the flow of the heat exchange fluid therebetween, each of the said plates having transverse notches extending thereacross and projecting outwardly from the said plate to a peak, whereby said notches support adjacent plates in said spaced relationship. There are indentations formed in the said notches. The plates may feature undulations which may run at an angle with respect to the notches.
Known from European patent application published under number EP0052592A2 is a heat transmission roll comprising two superposed strips wound about the core, one of which is provided with transverse ridges whereas the second strip is provided with longitudinal ribs. The transverse ridges of the first strip are provided are provided with indentations having a pitch matching that of the longitudinal ribs formed in the second strip, in which indentations engage said ribs formed in the second strip.
Disclosed in European patent application EP0136515B1 is the structure of a fume catalytic converter in the form of a roll composed of spirally wound, alternating layers corrugated transversely and of basically flat metal strips non-corrugated transversely. The strip non-corrugated transversely features a structure which extends basically longitudinally, i.e. in the winding direction, where the structure takes the form of grooves the depth of which is approximately equal to the thickness of the metal strip. The structure can take the form of alternating flat troughs and ridges of approximately identical width. The adjacent metal strips are soldered together in all or selected points of contact.
The heat transmission roll for a rotary cylindrical heat exchanger according to the invention, comprising layers formed by two superposed strips wound around the core, where the first strip is corrugated transversely to form regular waves with wave crests on the one side of the strip and wave troughs on the other side of the strip, while the second strip is basically flat, is characterised by the fact that formed on all wave crests of the first strip are bulges featuring slits, where one of the slit edges is formed into a tongue. The second strip features separate indentations to accommodate the bulges on the first strip, where the depth of the indentation corresponds to the pitch of the bulge.
Preferably, the bulges are spaced equidistantly, identically on all wave crests, and form lines parallel to the strip edges.
In particularly preferable variant, the distance between the adjacent bulges on a single wave crest falls within the range from 5 to 30 times the wave pitch, and the distance between the first line of bulges and the strip edge falls within the range from 5 to 25 times the wave pitch.
Most preferably, each bulge features one slit below the top edge of the bulge and parallel to that edge.
The most preferable technical effect of the invention is achieved when the tongue is formed on the edge of the slit on the side of the bulge top and bent outside, off the bulge wall.
Preferably, the width of the bulge falls within the range from 3 to 9 times the wave pitch, and the width of the slit is 60-95% of the bulge width.
In the most preferable variant of the invention embodiment the pitch of the bulge falls within the range from 0.2 to 0.75 times the wave pitch.
The basic advantage of the solution according to the invention lies in the fact that the roll forms a self-supporting structure for heat transmission designated for rotary cylindrical heat exchangers, where the structure ensures roll stability when the heat exchanger is in operation, i.e. when it is rotating, without the need to use any additional stabilizing technical means. An additional advantage consists in the possibility to simplify the production technology of such a roll by eliminating the stage of pre-shaping one of the wound strips.
An exemplary embodiment of the heat exchange roll for a rotary heat exchanger is illustrated on a drawing where
In the exemplary embodiment of the invention the heat transmission roll Z, the cross-section of which is shown on
In the exemplary embodiment of the invention the first and second strips 1, 2 are made of aluminum foil 0.02 mm-0.2 mm thick and 70 mm-300 mm wide, the wave pitch H of the corrugated foil is selected from range from 1 mm to 2.7 mm, the bulge pitch h is 0.3 times the wave pitch H, and the width S of the bulge is 4 times the wave pitch H. For the corrugated and basically flat foils to be clamped together effectively, appropriate rollers are used with the compression force effected on both strips in the course of their winding, ranging from 0.1 to 0.15 bar per each 10 mm of the pressure roller width. The aluminum can additionally be covered with a moisture-absorbing agent.
The solution according to the invention ensures minimising the friction between the layers of strips in the roll and prevents loosening of the roll during operation. The fact enables achieving the structure of a heat-transmission roll for a rotary heat exchanger which does not require the use of any additional technical means such as gluing, welding, pinning, etc., to ensure roll stability when the exchanger is in operation. The means deteriorate the heat exchange parameters and constitute a technological obstacle in the production of such exchangers. This is particularly important in the case of very narrow rolls in which ensuring the rigidity and stability with additional rods placed inside the roll is technologically very difficult. Moreover, the invention makes it possible to simplify the technology of producing a stable exchanger roll, since the basically flat strip does not need to be pre-shaped on a separate stand before being wound, or precisely positioned with respect to the second corrugated strip. Thanks to the application of pressure to the contacting strips in the course of their winding the bulges on the wave crests of the corrugated strip, when it is wound together with the flat strip, press against the flat strip causing indentations therein, and the slits and tongues on the bulges keep the strips in place and clamp them together tightly.
The heat transmission roll of the structure according to the invention can serve various applications, and be made in other variant than the exemplary embodiment, but sharing its substantial features.
Number | Date | Country | Kind |
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423707 | Dec 2017 | PL | national |
Filing Document | Filing Date | Country | Kind |
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PCT/PL2018/000122 | 11/30/2018 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2019/112454 | 6/13/2019 | WO | A |
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Number | Date | Country | |
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20200363137 A1 | Nov 2020 | US |