DE2206621A1 - Circulation heat exchanger - Google Patents

Description

Circulation heat exchanger

The invention relates to a circulation heat exchanger with a He! blow line, a cold gas line and a rotatable exchange reservoir made of heat-resistant material arranged in an interruption of the two lines Material, which in the axial direction of zellenartigon Passages for bridging the interruption of the two lines is penetrated.

In the case of heat exchangers of the type mentioned, I; the that active part of exchanges and from one Heat-sensitive material made rotatable exchange memory very fragile · In addition, can along its

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Extensive centrifugal forces occur. aside from that v / ground considerable pressure differences in the radial plane

effective on both sides of those places which share the boundary face to face with glasses. Such glasses form tight connections between the surfaces in a known manner of the exchange reservoir on the inflow and outflow side and at least one of the gas lines.

From the foregoing it follows that special precautions are required to avoid those that otherwise arise quickly To prevent cracks from forming on the circumference, which would render the memory unusable. Otherwise there would be a more frequent expansion and replacement of the replacement memory inevitable.

To counter this evil, it has already been suggested that a back pressure of one between that of atmospheric pressure and that along the perimeter of the exchange reservoir of the pressure prevailing in the passages strength to exert the radial forces regardless of whether the Heat exchanger is in operation or is at a standstill.

However, the practical implementation of this proposal encounters considerable difficulties, since then the exchange memory must be surrounded by a tight housing, in which the drive devices for the output ' swap memory are to be accommodated. This results in an extremely complicated, heavy and bulky structure, and Any repairs that may be required become extremely time-consuming. There are also considerable difficulties when ventilating the drive equipment.

An important aim of the invention is to overcome these deficiencies. Accordingly, with a ur.rmea.exchanger of the type mentioned initially provided according to the invention that the exchange tape along its circumference

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is inwardly loaded by an elastic pressure band wrapped around it with essentially constant tension.

In this way, the elastic compressive forces are balanced Can be achieved without difficulty by applying a controllable bias, so that there is a risk of cracking reduced in the exchange memory.

Since the pressure band is elastic, it can then also provide a sufficient one along the circumference of the exchange memory Apply clamping pressure when there is xinter exposure to high Temperatures and tensile stresses to a considerable extent.

This arrangement also eliminates the need to install the replacement memory and its drive devices in a pressure-tight housing, whereby both the production as well as maintenance and care, one designed in this way Simplify circulation heat exchanger considerably .

According to a further feature it is provided that between the exchange memory and the printing tape a heat-insulating Interlayer is arranged.

The od from a layer of fabric, felt. The like. The intermediate layer formed forms a thermal protection shielding the printing tape. In addition, it does one Even distribution of the mechanical pressure forces between the exchange memory and the pressure belt.

In an advantageous embodiment, the pressure band is formed from circular arc-shaped partial bands, which by means of each at finger-like interlocking end pieces elastic clamping devices used in two adjacent sub-bands are connected to one another.

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With such a design, the pressure band is subjected to practically the same tensile stresses at all points of the circumference, so that the forces exerted on the exchange memory are completely balanced.

In an advantageous embodiment, the clamping devices each have two support brackets, which are attached to hook-like Support folds at the ends of the respective sub-bands and move away from each other by an elastic force are burdened.

To generate the elastic force, at least one stack of disc springs is provided in one embodiment, which applied to the inside of the support bracket and pushed onto a pin attached to it.

According to another embodiment, the elastic tensioning devices each have a leaf spring, which supported with their ends in the hook-like folds at the ends of the respective partial belts, as well as an adjusting device for adjusting and fixing the middle part of the leaf spring in certain positions in relation to the Printing tape.

The closer the middle part of the leaf spring in this version the pressure band, the greater the force with which its ends are supported in the folds of the part bands. Consequently the tension force exerted by the pressure band along the circumference of the exchange memory is also greater, The the middle part of the leaf spring is closer to the printing belt.

The setting device contains, for example, an eccentric, by means of which the clamping force can be easily adjusted.

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With such a training is preferably at least one of the aistic clamping devices is a thermostatic Correction element between the eccentric and the middle part of the leaf spring. Such an element, for example an aneroid can, Use that expands when exposed to heat. Then step on the outside of the increased pressure tape Temperatures, which result in a strong thermal expansion of the pressure band, the thermostatic one expands Correction element also off, which automatically increases the ■ tension of the printing tape. In this Thus, the clamping pressure exerted on the circumference of the exchange memory can be independent of the temperature in the keep essential constant.

According to a further feature of the invention, in a circulation heat exchanger there is one around the exchange memory and provided coaxially with this arranged, externally toothed ring gear, on which at least one of the elastic Jigs are attached while-the rest Clamping devices in the Urafangsrichtüng of the ring gear are movable relative to this to a small extent.

The rotary drive of the replacement memory can thus take place via the toothed ring. Since only one of the jigs is on The ring gear is attached and the others have a certain amount of play in its circumferential direction, is the transmission of Excessive tension on the ring gear is avoided, but the exchange memory is nevertheless exactly centered in the Gear rim guided.

According to a further advantageous feature of the invention, on the side of the toothed ring are two with their inner ones Margins approximated, flat frustoconical Ring webs arranged, which together with their outer circumferential surfaces form a running channel for the frame of the heat * Form exchangers seated roles, of which at least

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one is mounted on a drive shaft and one is in engagement with the external teeth of the ring gear Gearing.

This arrangement enables the drive and guidance of the ring gear so / ie a radial and axial centering of the from the exchange memory, the heat-insulating intermediate layer, the rotatable unit formed by the pressure belt, the elastic tensioning devices and the ring gear.

This unit represents a sub-unit of the heat exchange 3Cher, which is put together before installation and in the case of repairs it can be expanded as a whole, so that maintenance and care of the heat exchanger is considerable are simplified and facilitated.

The bearings of the drive roller are preferably arranged in a fixed manner, while the at least one of the other rollers are radially movable and loaded by an elastic return force effective in the radial direction. By a Such a training can not lead to any existing irregularities of the running groove to tension / and changes in the dimensions of the trough due to expansion or wear can be automatically compensated for. "

The described arrangement according to the invention offers the considerable advantage that all of the drive devices can be placed on the outer edge of the exchange memory. Since no counterpressure needs to be exerted on the outer edge of the replacement storage unit, the drive devices are located in a zone with atmospheric pressure and low temperature, so that materials of medium quality can be used for their manufacture. In addition, it is possible to use forced ventilation to cool the drive device at ambient temperature.

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Further features, details and advantages of the invention emerge from the following description of exemplary embodiments based on the drawing. It shows:

• »

Fig. Λ a schematic axial sectional view of a circulation heat exchanger according to the invention,

2 shows a schematic radial sectional view of the heat exchanger according to FIG. 1,

Fig. 5 is an enlarged partial sectional view of the heat exchanger ,

Fig. 4- is a partial sectional view showing one of the elastic clamping devices,

Fig. 5 is a partial representation of the interdigitated finger-like End pieces of each of the abutting part bands of the printing band,

Figure 6 is an axial sectional view of that shown in Figure 4- Jig, "

7 shows a radial sectional view of another embodiment of an elastic tensioning device,

8 shows a radial sectional view of a further embodiment of an elastic tensioning device and

9 shows an axial sectional view of the trough firmly connected to the toothed ring with a drive roller.

The circulation heat exchanger shown in Fig. 1 has a Low pressure hot gas line 1 and a high pressure cold gas line 2, in which a cold gas, as indicated by the arrows, flows in the opposite direction to the hot gas. The active one

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Part of the heat exchanger is a rotatable exchange memory 4 made of heat-resistant ceramic material formed, v / elcher in the longitudinal direction, i.e. in the direction of the axis 5 of the exchanger, of cell-like passages is interspersed. The exchange memory 4 is in an interruption of the two lines 1 and 2 arranged such that the intermittent interruption of the individual lines 1 and can be bridged in a known manner by means of the passages, a heat transfer taking place from the hot gas to the cold gas.

On both sides of the exchange memory 4 there is a pair of glasses 6, on each of which there is a bellows 7 is sealingly in contact. The bellows 7 are connected to the ends of the high pressure cold gas line 2, The glasses 6 determine the size ratio of the active surface. 8 and 9, of which the thermal The efficiency of the exchanger is dependent.

According to the invention, "the exchange memory 4 is loaded with an essentially constant pressure along its circumference by an elastic pressure band 10 guided along the circumference. A heat-insulating intermediate layer 11 is inserted between the exchange memory 4 and the pressure band 10. The pressure band 10 is off three equally long, circular arc-shaped partial bands 10a, 10b and 10c are formed, which are joined together by means of three elastic clamping devices. The clamping devices 12 each engage on finger-like interlocking end pieces of two abutting partial bands (Fig. 5). In the embodiments according to FIGS 7 and 12 contain clamping devices in each case two support brackets 12a, 12b, which are supported in the hook-shaped folds 13b and 13a at the ends of Teilbäuder 10b and 10a. the ktütr.v.'inkc.i 12a and 12b are of an elastic force acted which seeks e'e to move apart. It is of

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four stacks 14 roughly ke ^ elsfeurnpfföraiger, in pairs one on top of the other oppositely arranged spring washers exercised. The spring stacks 14 are supported on the inner sides of the Support brackets and are seated on it, the spring washers centered under tension holding pin 15 pushed.

It can be seen that the replacement memory in the arrangement according to the invention is provided along its circumference by the pressure band is loaded inward with a high pressure even if. this expands under the influence of heat. This is because of it causes; that the elongation of the three sub-bands forming the pressure band each of the spring washer stacks 14 are recorded, which in a sufficiently wide range a practically constant, the support angle apart exerting stressful force.

In another embodiment shown in FIG. The elastic tensioning devices each have a leaf spring 16, which with their ends 16a and 16b with the folds 13b and 13a at the ends of the partial bands 10b and 10a is engaged »

The position of the central part of the leaf spring 16 can be set or fixed in relation to the printing belt 10 by means of an adjusting device. The adjusting device is formed by an eccentric piece with two pins 17 and 18 arranged eccentrically to one another. The axis of the pin 17 is immovable with respect to the pressure band 10, while the axis of the pin 18 can be adjusted by turning the pin 17 with respect to the pressure band. The pin 18 is supported by calibration on a bearing shell 19 firmly connected to the leaf spring 16, so that the tension of the spring 16 and thus of the pressure band 10 can be changed by turning the eccentric piece.

This embodiment is based on at least one of the

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elastic clamping devices, one of which is shown in FIG. 8, a thermostatic correction element, for example an aneroid donor 20 between the bearing shell 19 ψκΐ dem Middle part of the leaf spring 16 used, from which the above-mentioned advantage of additional compensation results. ...

The formation of the drive devices for the rotatable Exchange memory can be seen from FIGS. 1, 4 and 7 to 9. They contain one along the perimeter of the exchange memory 4 coaxially with this arranged, externally toothed ring gear 21. A motion-transmitting connection between the ring gear 21 and the exchange memory 4 is formed by one of the three elastic clamping devices, For this purpose, a bolt 22a held immovably in the radial direction in a groove 23 of the support bracket 12a is shown in FIG fixed engagement with the ring gear 21 and means (not shown) Cotter pins secured against axial displacement. Wear the other two elastic tensioning devices also bolts 22b or *. 22c, which, however, can move freely in guide slots 24b and 24c in the ring gear 21. The limited mobility of the bolts 22 ^ b and c in the Slitting 24b or c in the circumferential direction brings about the advantages already mentioned above (FIG. 3).

In the embodiment according to FIG. 7, the one for the motion-transmitting Connection with the ring gear 21 provided elastic clamping device 12 a nose 25, which with a notch 26 in the ring gear is engaged.

In the embodiment shown in Fig. 8, the pin 17 is mounted in a bore in the ring gear 21 so that the eccentric both the motion-transmitting connection between the ring gear and the exchange memory as well as the concentric alignment of the two parts takes over.

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The ring gear 21 is fixed with two with their inner edges approximated, flat truncated cones Ring webs 27, 28 connected (Fig. 9). The outer ^ circumferential surfaces 27a and 28a of the ring webs form a trough

for rollers 29, 30 and 31. The roller 29 is firmly seated on a Drive shaft 32, and carries one with the external toothing of the gear rim 21 meshing toothing 33 · It thus causes the drive of the gear rim 21 and thus of the replacement memory 4.

The bearings 34 of the drive roller 29 are with respect to the Frame 55 of the heat exchanger fixedly arranged, while that of the roller 31 is radially movable and, for example are elastically loaded radially inwards by a spring 32 (FIG. 2). In this way the three roles operate Safe axial and radial guidance of the ring gear, with any stresses or excessive stresses that may arise Game can be compensated for by the radial mobility of the bearings of the roller 31.

The rotatable unit of the exchanger is arranged in a housing 37 which is connected to the hot gas line 1 Flow-connected low-pressure chamber encloses (Fig. 1). The seal between this chamber and the under atmospheric Drive devices under pressure is provided by edge seals 38 held by leaf springs 39 causes which, in cooperation with heat shielding walls 40, divert leak gases to the outside so that they cannot heat the drive devices to an inadmissible degree.

The drive devices are forcibly ventilated by means of air at atmospheric pressure and low temperature, such as by the arrows 41 indicated in FIG.

It can be seen that the drive devices for the exchange memory are safely protected from excessive temperatures,

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You can therefore from materials of no more than average Quality be made, whereby the Gestehunr ^ price of the V / ärmeaustcuschery can be reduced.

All from the claims, the description; and the drawing apparent features and advantages of the invention, including structural details, spatial arrangements and procedural steps, can be used both in and of themselves also be essential to the invention in any combination "

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Claims (9)

Patent claims specialties: eg Λ J Circulation heat exchanger with a hot gas line, a cold gas line; and a rotatable exchange memory made of heat-resistant material arranged in an interruption between the two lines, v / which is penetrated in the axial direction by cell-like passages for bridging the interruption of the two lines, characterized in that the exchange memory (4) along its effective circumference by a it is wrapped around, over its entire width extending, elastic pressure band (10) is loaded inwardly with a substantially constant tension. 2. Uralauf heat exchanger according to claim 1, characterized it is indicated that the printing band (10) is made up of thin, arcuate bands (10a to 10c) is formed, which means between interdigitated fingers End pieces in each case zv / egg of adjacent partial bands of effective elastic tensioning devices (12) are connected to each other, and that between the partial bands and the effective peripheral surface of the exchange memory (4 ·) ' a flexible, heat-insulating intermediate layer (11) is inserted 3- circulation heat exchanger according to claim 1 and / or 2, characterized in that the elastic clamping devices (12) each have two support brackets (12a, 12b) each in a hook-shaped fold (13a, 13b) at the end of a partial belt (10a, 10b) and are acted upon by an elastic force driving them apart, 4, circulation heat exchanger according to claim 3, characterized in that the elastic force of at least one between the inner sides of the support bracket 209837/0740 (12a, 12b) inserted and on one of the S seated pin (15) pushed-on spring washer stack is exercised. 5 · circulation heat exchanger according to at least one of "claims 1 bie 4, characterized in that "the elastic tensioning devices each contain one leaf spring (16), which with their ends (1Gr, 1Gb) each in a hook-shaped U'alze (13b, IJa) at the end of a partial belt (10b 1Oa) supports, and that the position; of the middle part of the Leaf spring by means of a Gtblleinidchtung (17, 18) in relation on the pressure band (4) ve · ?? - or can be determined. 6. circulation heat exchanger according to claim 5, characterized characterized that the adjusting device contains an eccentric piece (17, 18). 7. circulation heat exchanger according to claim 6, characterized characterized in that at least one of the elastic tensioning devices has a thermostatic Correction element (20) is inserted between an eccentric (18) and the central part of the leaf spring (16). 8. Circulation heat exchanger according to at least one of the Claims 1 to 7 »characterized in that that a so coaxial, externally toothed ring gear (21) is arranged around the exchange memory (4), on which at least one of the elastic clamping devices (12) is rigidly attached, while the other clamping devices are movable to a small extent in its circumferential direction. 9. circulation heat exchanger according to claim 8, characterized in that on both sides of the ring gear (21) two with their i ^^ oron! Minor approximated, flat truncated cone-wige ring webs (27,28) are arranged , which with their outer unifangs surfaces, 28a) a running groove for the frame (35) of the heat 209837 / 07A0 Exchanger mounted rollers (29, 30, 3 * 1) "form, of which at least one is attached to a drive shaft (32) and one with the external provision of the ring gear (21) in Engaging standing toothing (33) carries. - 2ÖS837 / 07AÖ Lee rsTe i t e