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Regenerative heat exchanger with a rotor seal with forced guidance

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Regenerative heat exchanger with a rotor seal with forced guidance


A regenerative heat exchanger, including a heat accumulator arranged as a rotor, rotatably held around a central rotational axis, and configured to transmit a heat of at least one gas volume flow passing through the rotor to another gas volume flow passing through the rotor, and including a sealing system for the rotor including at least one seal which is fixed in relation to the rotor, is pressed against the rotor, and is supported by a plurality of rollers on the rotatable rotor.

Browse recent Balcke-durr Gmbh patents - Ratingen, DE
Inventor: Erich Born
USPTO Applicaton #: #20120298326 - Class: 165 9 (USPTO) - 11/29/12 - Class 165 
Heat Exchange > Regenerator >Movable Heat Storage Mass With Enclosure >Rotary Heat Collector >Seals

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The Patent Description & Claims data below is from USPTO Patent Application 20120298326, Regenerative heat exchanger with a rotor seal with forced guidance.

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CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to foreign European Patent Application No. EP 10015001.0, filed on Nov. 25, 2010, the disclosure which is incorporated by reference in its entirety.

FIELD OF THE DISCLOSED SUBJECT MATTER

The disclosed subject matter relates to a regenerative heat exchanger including a heat accumulator arranged as a rotor, rotatably held around a central rotational axis, and configured to transmit a heat of at least one gas volume flow passing through the rotor to another gas volume flow passing through the rotor.

BACKGROUND

Regenerative heat exchangers of this kind are used for heat transmission from at least one gas volume flow to at least one other gas volume flow. A rotating heat accumulator, which is the so-called rotor, is heated in an alternating fashion by at least one gas volume flow and cooled again by at least one other gas volume flow, with thermal energy being transmitted from the one to the other gas volume flow. As a result, one of the gas volume flows can be heated and another gas volume flow can be cooled. The rotor comprises two face sides, an outside jacket and usually a segmented portion for accommodating the heat accumulator masses. The rotor is rotatably held around a central rotational axis, with said rotational axis preferably be aligned vertically.

To seal the gas volume flows guided through the regenerative heat exchanger, a sealing system with core, radial, and/or circumferential seals is provided. The radial seals are arranged on the face sides of the rotor and are provided to prevent short-circuit volume flows between the gas volume flows. The circumferential seals are arranged on the face edges of the rotor and are provided to prevent leakage volume flows into the rotor housing or into the ambient environment. The seals are arranged in a stationary manner with respect to the rotating rotor. As a result of a permanent relative movement between the rotor and these seals and a continuously changing thermal expansion of the rotor and consequently resulting uneven rotor deformations, high demands are placed on the sealing system in order to achieve a low amount of losses (leakages) and thus a high level of efficiency.

Various sealing systems are known from the state of the art, which enable a relatively small sealing gap in operation between the seal and the rotor. Reference is made in this respect for example to European Patent Application Publication Nos. EP 1 777 478 A1 and EP 2 177 855 A, the disclosures of each of which are incorporated by reference in their entireties. However, conventional sealing systems are frequently disproportionately complex and expensive in practice.

SUMMARY

It is an object of the disclosed subject matter to provide a regenerative heat exchanger of the kind mentioned above with a simple and effective sealing system.

This object is achieved by a regenerative heat exchanger in embodiments incorporating the features of claim 1. Other aspects of embodiments of the disclosed subject matter are recited in the dependent claims.

In an embodiment of the disclosed subject matter, the sealing system for the rotor comprises at least one seal which is fixed in relation to the rotor and which is pressed against the rotor or a component belonging to the rotor (e.g. by effective weight, spring cylinders, actuators and the like) and which is supported by a plurality of rollers on the rotatable rotor or on a component belonging to the rotor, thereby being provided with forced guidance predominantly in the axial direction. This means that the respective seal is quasi subject to forced guidance, which leads in operation to the consequence that the respective seal continuously follows the thermally induced rotor deformation at a constant distance which is predetermined by the rollers, as a result of which a small and constant sealing gap is ensured.

In accordance with the disclosed subject matter, minimal sealing gaps can be realized with a comparatively low amount of constructional effort, so that short-circuit and/or leakage volume flows will occur to an exceptionally low extent. In the case of regenerative heat exchangers with suction, the gas quantity to be removed will be reduced. Similarly, the sealing gas quantity will be reduced when using sealing gas. Moreover, the disclosed subject matter has proven to be very beneficial to mounting and offers simple handling and maintenance. It is a further advantage that it is possible to omit the electromechanical and mostly sensor-controlled adjusting devices for the seals which are included in many conventional designs.

In another embodiment of the disclosed subject matter, it is preferably provided that the rollers are arranged in the fixed seal and/or are fastened to the fixed seal. The rollers can be held with a shaft on the seal or a component belonging to the seal. In another embodiment, it is further preferably provided that the rollers will roll off on at least one corresponding running or rolling surface on the rotor or a component belonging to the rotor, or are guided between two corresponding rolling surfaces which are axially spaced from one another. These rolling surfaces can be especially arranged on exchangeable wearing plates which are fastened to the rotor (a rotor body or a component belonging to the rotor). Similarly, a reverse arrangement of rollers and running surfaces can be provided.

In order to ensure a minimal sealing gap, especially in critical regions in which the seal is pressed against the rotor (actuating points), the individual rollers may be arranged at least in the region and especially only in the region of the actuating points or pressing points of the seal against the rotor.

The seal which is supported by means of the rollers is preferably a radial seal. The seal which is supported by means of the rollers is especially a circumferential seal. It is also possible to simultaneously support both the radial seals and also the circumferential seals at least on one rotor side by means of rollers on the rotating rotor.

In another embodiment there is at least one circumferential seal which is supported by means of rollers on the rotor and is coupled with a radial seal on the same rotor side, such that the respective radial seal is co-moved during the axial movement of the circumferential seal in the axial direction. For this purpose, the radial seal is movably arranged in the axial direction. The coupling between the circumferential seal and the radial seal may occur via a mechanical actuating mechanism, which transmits axial movements of the circumferential seal via at least one actuating bar or the like onto the respective radial seal. The sealing system on one rotor side can therefore perform movements which follow the rotor movements in the axial direction. The preferably radially extending actuating bar is ideally arranged in the rotor housing of the regenerative heat exchanger, namely between the respective radial seal and the wall of the housing, wherein a sealing sleeve can also be arranged in this area.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained in closer detail by reference to embodiments shown in the drawings, which show the following in the schematic partial sectional views:

FIG. 1 illustrates a first embodiment of a regenerative heat exchanger;

FIG. 2 illustrates a second embodiment of a regenerative heat exchanger;

FIG. 3 illustrates a third embodiment of a regenerative heat exchanger, and

FIG. 4 illustrates a fourth embodiment of a regenerative heat exchanger.



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stats Patent Info
Application #
US 20120298326 A1
Publish Date
11/29/2012
Document #
13303127
File Date
11/22/2011
USPTO Class
165/9
Other USPTO Classes
International Class
/
Drawings
5



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