MXPA96001870A - Contracrisol exposed to side fire, cooled directame - Google Patents

Abstract

The present invention relates to a refining furnace for cooling molten glass coming from a glass melting furnace according to which it flows into a forming machine, the refining furnace extends in a longitudinal direction and is constructed and accommodated to have molten glass at a predetermined level, and characterized in that it comprises: an isolated, horizontally extending, elongated hopper, having an inlet end constructed and accommodated to receive molten glass from a glass melting furnace, and an outlet end constructed and arranged to discharge the molten glass into a forming machine, a roof structure covering at least a portion of said insulated hopper, the roof structure comprises a series of refractory ceiling block elements, extending longitudinally, each of The roof block elements is of a one piece construction and extends transversely of the hopper isolated from one side of said insulated hopper towards the other side of the insulated hopper, each of the roof block elements has an internal surface with first and second concave surface portions, facing downwards and extending longitudinally , a third portion of concave surface facing downwards and extending longitudinally between the first and second concave surface portions facing downwards, and the first and second convex portions facing downward and extending longitudinally, a of the first and second convex surface portions is positioned between the third concave surface portion and one of the first and second concave surface portions, and is constructed and accommodated to substantially prevent heat transfer therebetween, the other of the first and second surfaces convex is placed between the third portion of concave surface and the other portion of the was and second portions of concave surface and being constructed and accommodated substantially to prevent heat transfer therebetween, a plurality of generally transversely extending passages is accommodated in a longitudinally extending array, each of the passages terminating in an aperture placed between the first and second convex surface portions, for introducing a cooling medium in the refining furnace in direct contact with the third concave surface portion of the internal surface, at least one exit of the cooling medium from the refining furnace, at least one outlet of the cooling medium that is longitudinally spaced from at least some of the plurality of passages, to remove the cooling medium from the refining furnace, first and second longitudinally extending pluralities of generally opposite burners, extending in general transversally, the burners of the first plura In this embodiment, the burners of the second plurality ignite within a second space underlying the first concave surface portion, the burners of the second plurality ignite within a second space underlying the second portion of the concave surface, a refractory bridge element extending through the second portion of the concave surface. the hopper isolated at a location between the inlet end and the outlet end, the refractory bridge element projects downward toward the level of the molten glass in the refining furnace and separating said refining furnace in a cooling section and an equalizing section, the refining furnace gradually becomes narrower in the transverse width as it proceeds from the refractory bridge element to the exit end, the array of elements of the roof block is positioned over the cooling section; minus a roof block element of the equalization section covers at least a portion of the equalization section, at least one roof block element of the equalizing section has an internal surface whose shape, in cross section, is the same as that of each of the roof block elements, the inner surface of the at least one roof block element of the equalizing section further has a taper in the longitudinal direction to gradually decrease the distance between the inner surface of the roof block element of the equalizing section and an upper surface of a stream of molten glass flowing under

Description

REF: 22523 CONTRACRISOL EXPOSED TO SIDE FIRE, DIRECTLY COOLED FIELD OF THE INVENTION The present invention relates to a countercrisol for cooling a stream of molten glass as it flows from a melting furnace to a forging machine. More particularly, this invention relates to the counter-lock of the above characteristics with direct cooling of the center of the glass stream and heating of the flanks of the stream by burners placed along the flanks of the counter-lock and the cross-heating of the contracrisol.

BACKGROUND OF THE INVENTION . In the manufacture of glass products, for example, blown glass containers, it is customary to provide a relatively narrow, elongated conditioning chamber, usually called counter-syringe, to cool the glass to an appropriate relatively uniform temperature as it flows from a glass. glass melting furnace to a forming machine. A typical counter-shell is in the form of a horizontal, insulated passage, and is provided with an insulated vault structure. It is known that the temperature of the glass flowing through a counter-lock tends to be uneven across the counter-lock due to the fact that the heat loss across the countersurface flanks tends to make the extreme portions of the flow glass in the counterclock cooler than the central portion of the glass stream. For this reason, it is known that it is necessary to provide burners or other heating means for imparting heat to the end portions of the glass stream in the counter-lock and to provide means for cooling the central portion of the glass streams in the counter-lock in relation to the lateral portions. The cooling of a modern glass counter-lock typically involves flowing ambient air along the center line of the counter-lock and above the glass in the counter-lock, either without physical contact with the glass in the counter-lock, in which case the counter-lock it is often called indirectly cooled counter-syringe, or in contact with the glass in the counter-syringe, in which case the counter-syringe is known as directly cooled counter-syringe.

U.S. Patent Nos. 4,680,051 (Blumenfeld et al.) And 5,169,424 (Grinnen et al.) Describe countercysols of the indirectly cooled type, and US Patents 4,511,385 (Barkhau et al.) And 3,999,972 (Brax) describe countercysols of the chilled type directly. The description of each of the above North American patents is incorporated herein by reference. The cooling of the glass in a countercrisol, either of the directly cooled or indirectly cooled type, tends to be predominantly radiation from the hot upper surface of the glass stream in the counterclockwise to the colder internal surface of the vault structure, immediately above the countercrisol center. The cooling air, in a directly cooled counter-syringe, directly cools the surface receiving the radiant energy from the counter-shell dome structure, while the cooling air in an indirectly cooled counter-syringe cools a surface that is separated from the surface that receives the radiation through the finite thickness of a refractory or other material of a moderately conductive nature. In this way, the temperature control system for controlling the cooling in a directly cooled counter-syringe is able to respond more quickly to correct the temperature conditions of the glass when they deviate from the predetermined ideal temperature conditions. The uniformity of the temperature is especially important in the forming operations of modern glass containers, where the weight of the gobbled mass of molten glass is very important for the control of the quality and volume of the glass container, because the weight of the guttiform mass of molten glass from which a container is formed depends on the viscosity of the glass stream from which the goop is formed, and the viscosity of the glass stream is a function of its temperature . The structure of the vault of a directly cooled counter-lock of the type illustrated in the aforementioned USPatent 4,511,385 is a very complex structure, formed from a series of longitudinally extending elements, each of which consists of a transverse arrangement of a plurality of individual pieces. The pieces in each collective transverse arrangement are provided with a complex shape, in a transverse direction, to define the longitudinally extending barriers to confine the flow of cooling air to the central portion of the counterclock and the flow of combustion products. from the side heating burners to the lateral regions of the counter-lock. Such a multi-piece vault structure is difficult to install, and there is a tendency for individual pieces to move with respect to each other over a period of time, thereby opening up fractures or spaces between adjacent surfaces of adjacent blocks in the structure of the vault. In addition, for optimum control of the temperature uniformity of the glass stream within a counter-lock, it is desirable to control the heating of the burners on each side of the counter-lock irrespective of the burners on the other side of the counter-lock, and the directly cooled counter-washers known were not provided with such independent heating control systems. This factor is especially important in the installations of modern counter-grids, which tend to be wider than their first counterparts to provide greater glass residence times.

BRIEF DESCRIPTION OF THE INVENTION According to the present invention there is provided a countercrisol cooled in the central line, directly, in which the structure of the counterclock dome is made of a series of longitudinally extending dome block elements, each of which is It extends completely across the contracrisol. Each dome block element is provided with a suitable multiple side inlet, and multiple inlet passages extending in transverse direction, longitudinally spaced apart, for the cooling air, to provide a generally longitudinal cooling air flow, tightly controllable, above the center of the glass stream in the counter-lock. Each dome block element is also provided with outlets for the combustion products of the counter-arc burners mounted laterally to eject the combustion products from the ends of the counter-lock, and each is provided with a contoured arrangement to substantially isolate, from physically, the extreme portions of the glass stream in the counter-crusol, which are heated, from the central portion of the glass stream, which is being cooled. In addition, the blocks of the counterclock dome of the above characteristics for use in the compensation zone or final equilibrium of the counter-lock, immediately upstream of the molten glass outlet of the counter-lock, are provided with an inwardly bevelled extension as they extend towards the exit of the counter-lock, to ensure that all the portions of the glass stream in the counter-lock are flowing from the counter-lock in a synchronized manner. Accordingly, an object of the present invention is to provide a cooled glass counter-lock on the center line, improved. More particularly, an object of the present invention is to provide a counterclockwise cooled directly from the above characteristics. For a better understanding of the present invention and the objects thereof, attention should be drawn to the drawings and the following description thereof, for the detailed description of the preferred embodiment, and to the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a fragmentary plan view of a counterclockwise according to the preferred embodiment of the present invention; Figure 2 is a sectional view taken on line 2-2 of Figure 1; Figure 3 is a sectional view taken on line 3-3 of Figure 1; Figure 4 is a plan view of a counter-lock element of Figures 1-3; Figure 5 is a sectional view taken on line 5-5 of Figure 2; Figure 6 is a sectional view taken on line 6-6 of Figure 2; Figure 7 is a sectional view taken on line 7-7 of Figure 2; and Figure 8 is a perspective view of a portion of the counter-lock of Figures 1-3.

DETAILED DESCRIPTION OF THE PREFERRED MODALITY A counter-lock according to the preferred embodiment of the present invention is generally indicated by the reference numeral 20 in the drawing, and the counter-lock 20 is constituted by a cooling section, which is generally designated by the number 22, and by a balance or compensation section, which is generally designated by the numeral 24. The counter-lock 20 is in the form of a horizontally extending asylum elongated passage 26, through which the molten glass of a glass melting furnace, not shown, it flows from the right side to the left side of the drawing, as illustrated in Figures 1 and 2, to a glass feeder funnel 28, from which it is discharged by gravity to a glass forming machine, either sample. As shown in Figures 2 and 3, the cooling section 22 of the counter-lock 20 is covered by a series of dome blocks 30 extending longitudinally., each of which extends completely from side to side of the insulated passageway 26. Each block of the dome 30 is patterned from a suitable refractory material and has an innermost surface with concave portions 30a, 30b extending longitudinally from counterclockwise. adjacent to its sides, a concave portion 30c extending longitudinally from counterclockwise 20 above its central line, and convex portions 30d and 30e separating the concave portions 30a, 30c and 30b, 30c, respectively. The burners 32, preferably of a gas-operated type, are mounted along opposite sides of the counter-lock 20 and are oriented to burn transversely to the glass flow direction through the counter-lock 20. The burners 32 heat the portions of the glass stream in the counter-lock 20 which are adjacent to the outer ends of the counter-lock, but do not effectively or significantly heat the glass in the central region of the counter-lock due to the presence of the convex portions 30d, 30e of the block dome 30, which substantially confines the flow of the combustion products of the burners 32 to the outer regions of the counter-lock 20, and prevents the transfer of heat by radiation between the outer regions of the counter-lock and the central region. In that regard, the vault block 30 is provided with exhaust passages 34 molded therein to expel combustion products from the burners 32 from counter-lock 20 to the locations below the concave portions 30a, 30b of the block. of vault 30. Exhaust passages 34 along each side of each vault block 30 discharges in a longitudinally extending conduit 36, and are expelled from each conduit 36 in longitudinally spaced openings, each of which These are provided with an adjustable damper block 38, shown schematically, to control the airflow within the conduits 36. Preferably, heating the burners 32 on one side of the counter-lock 20 will be controlled independently of the heating of the burners 32 on the another side of counter-lock 20 to make uniform the optimum temperature of the molten glass flowing through the contracrisol 20. This is especially important for the counter-curls that are intended to process amber glass compositions, because such compositions are very sensitive to high temperature differences. The portion of the molten glass stream inside the counter-lock 20 which lies below the concave portion 30c of the dome block 30 is cooled primarily by radiation by cooling the inner surface of the concave portion 30c, which is positively cooled by the flow of a stream of air or other gaseous refrigerant fluid below it. The air is introduced into the counter-lock 20 from one or more bellows, not shown, through a multiplicity of longitudinally spaced passages 40, which extend transversely for flow along the centerline of the counter-lock 20, towards one or another of a longitudinal series of cooling air outlets 42. The convex portions 30d, 30e of the inner surface of each dome block 30 substantially prevent the flow of cooling air to the outer regions of the counter-lock 20, i.e. those which lie below the concave portions 30a, 30b, and prevent the substantial flow of combustion products from the outer regions of the counterclockwise to the region that lies below the inner surface of the concave portion 30c. The 4 cooling air outlets 42 are formed by the opposing cavities 42a, 42b in the adjacent vault blocks 30, and each of the outlets 42 is provided with an adjustable damper block 44, shown schematically, to control the air flow within the associated outlet 42. The damping blocks 44 allow the maintenance of positive pressures within the cooling section 22. The air flow is controlled by the positions of the damping blocks 44 or through the use of a variable speed fan. The junction between the cooling section 22 and the compensation or balance section 24 of the counter-lock 20 is separated by a refractory bridge element 46 extending transversely from the counter-lock 20 from a place above the glass flow therethrough, downwardly. , to a place slightly above the level of the glass in it. The bridge element 46 serves to isolate the cooling section 22 from the compensation section 24 to prevent the transfer of heat by radiation therebetween and to allow the maintenance of different internal pressures within the cooling section 22 and the compensation section 24 when desired. As is clear, from Figure 1, the transverse extension of the glass flow portion of the feeder funnel 28 is substantially smaller than the extent of the glass flow of the cooling section 22 of the countercrisol 20. To avoid dead zones in the molten glass in the compensation section 24 of the counter-lock 20, as a result of the reduced glass flow within the feeder funnel 28, relative to the cooling section 22, the compensation section 24 of the counter-lock 20 is provided with an internal bevel in flow direction of the melt through the counter-screw 20. Thus, the extent of the molten glass stream flowing from the compensation section 24 to the feeder funnel 28 is substantially the same as the extension or amplitude of the feeder funnel 28, and the vault of the compensation section 24 is defined by one or more, but preferably two vault block elements 50, 52. L The vault block elements 50, 52 have a shape, in the transverse direction, which is similar to the shape of each vault block member 30, as shown more clearly in Figure 8. In addition, as shown in FIG. Figure 2, the vault block elements 50, 52 have a downward bevel extending in the longitudinal direction to gradually reduce the distance between the internal surface of each dome block element 50, 52 and the molten glass stream that it flows down. If desired, additional burners 32 may be placed on opposite sides of the compensation section 24, preferably upstream on the dome block elements 50 and the ends thereof, as shown in Figure 6. In any case, the vault block elements 50, 52 are provided with the cavities 50a, 52a which engage to define an outlet 54 for the cooling air of the compensation section 24, and provide air inlet passages 56 in the block member of vault 50 for introducing cooling air into the compensation section, if additional cooling of the glass stream flowing therethrough is required. The compensation section 24 is also provided with a damper block 58, shown schematically, to control the air stream within the outlet 54. If it is desired to add the glass cooling capacity to the counter-lock 20, for example, when a composition is processed of glass whose melting temperature is higher than the glass compositions originally processed in the counter-crusol, additional cooling capacity can be added by providing the cooling section 22 with a plurality of lower cooling units 60 longitudinally spaced apart. Each lower cooling unit includes a blind hole 62 in the lower side of the insulated passage 26 and centered along the longitudinal central axis of the passage 26. Each blind hole 62 is preferably added when the counter-lock 20 is at an elevated temperature, to avoid distortion or misalignment due to thermal expansion, inserts a closed-ended metal receptacle 64 into each blind hole 62. Then air or other cooling gas is made to flow into each receptacle 64 from an inlet tube 66, shown in a fragmented form. If the added lower cooling provided by the cooling units 60 is used more than necessary, the receptacle 64 and the inlet pipes 66 can be removed and the blind holes 62 closed with refractory. If desired, each blind hole 62 can extend through the refractory to the final refractory layer, still fully through the refractory to the glass channel for a maximum cooling effect. Although the best mode contemplated by the inventors to carry out the present invention is as shown and described at the date of presentation thereof, it will be apparent to those skilled in the art that suitable modifications, variations and equivalents can be made without departing from the spirit of the invention. scope of the invention, such scope is limited only by the terms of the following claims and the legal equivalents thereof. It is noted that in relation to this date, the best method known by the applicant to carry out the practice is the conventional one for the manufacture of the objects to which it refers.

Having described the invention as above, property is claimed as contained in the following:

Claims (21)

REI INDICATIONS

1. A counter-lock for cooling molten glass from a glass melting furnace as it flows to a forming machine, the counter-fire is characterized in that it comprises: an isolated elongate passageway extending generally horizontally, having an inlet end adapted to receive molten glass from a glass melting furnace and an outlet end adapted to discharge molten glass discharge to a forming machine; a vault structure covering at least a portion of the insulated passage, the vault structure comprises a series of refractory vault block elements extending longitudinally, each of the vault block elements being of one piece construction and extending transversely of the insulated passage from one side of the insulated passage to the other side of the insulated passage, each of the dome block elements has an inner surface with first and second concave surface portions extending longitudinally and facing downwards, one third portion of concave surface extending longitudinally and downwardly between the first and second concave surface portions facing downward and first and second convex surface portions extending longitudinally and oriented downward, one of the first and second portions of convex surface is placed between the third portion of concave surface and one of the first and second concave surface portions and is adapted to prevent substantial transfer of heat between them, the other of the first and. second convex surfaces are positioned between the third portion of the concave surface and the other portion of the first and second concave surface portions and are adapted to prevent substantial heat transfer between them, a passage in the dome block element, the passage it terminates in an opening placed between the first and second portions of the convex surface, for introducing a cooling medium in the counter-lock in direct contact with the third concave surface portion of the inner surface, an exit of cooling medium from the counter-lock, the outlet of the cooling medium is longitudinally separated from the passage, to extract the cooling medium from the counter-syringe; first and second generally opposite burners, which extend transversely generally, one of the first and second burners heat in a first space below the first portion of the concave surface, the other of the first and second burners heat in a second space below the second portion of the concave surface; and first and second exhaust passages for expelling the products of combustion from the first and second spaces, respectively, the first exhaust passage being longitudinally separated from the first burner, the second exhaust passage being longitudinally separated from the second burner.

2. The counter-lock according to claim 1, characterized in that it further comprises: a refractory bridge element extending through the insulated passage at a location between the entry end and the exit end, the refractory bridge element projects downwardly towards the level of the molten glass in the counter-lock and separates the counter-lock in a cooling section and a compensation or balance section, the counter-lock gradually becomes narrower in its transverse width as it proceeds from the refractory bridge element to the end of exit, the series of dome block elements is placed on the cooling section.

3. The contracrisol according to claim 1, characterized in that it further comprises: third and fourth burners in general opposite, transversely extending generally, one of the third and fourth burners heats in the first space and is longitudinally separated from one of the first and second burners, the other of the third and fourth burners heats in the second space and is longitudinally separated from the other of the first and second burners.

4. The counter-lock according to claim 1, characterized in that the outlet of the cooling means is formed by a recessed portion at one end of one of the dome block elements and an opposite recessed portion at one end of a dome block element. adjacent.

5. The counter-lock according to claim 1, characterized in that it further comprises: a second passage in the dome block element, the passage is opposite the passage and ends in a second opening placed between the first and second portions of the convex surface for, introducing the additional cooling medium into the counter-syringe in direct contact with the third portion of the concave surface of the inner surface.

6. The counter-lock according to claim 2, characterized in that at least a portion of the insulated passage extends substantially from an inlet end to the refractory bridge element.

7. The counter-lock according to claim 2, characterized in that it further comprises: at least one vault block element of compensation or balance section covering at least a portion of the compensation section, the vault block element of the section of The compensation has an internal surface whose shape, in its cross section, is similar to that of each of the vault block elements, the internal surface of the at least one vault block element of the compensation section further has a bevel in longitudinal direction to gradually decrease the distance between the internal surface of the vault block element of the compensation section and an upper surface of a stream of molten glass flowing under it.

8. The counter-lock according to claim 2, characterized in that it further comprises: a plurality of vault block elements of the longitudinally extending compensation or balance section covering substantially the entire compensation section, each of the block elements of The vault of the compensation section has an internal surface whose shape, in the cross section, is similar to that of each of the vault block elements, the internal surface in each of the vault block elements of the vaulting section. The compensation also has a bevel, in the longitudinal direction, to gradually decrease the distance between the internal surface of each of the vault block elements of the compensation section and an upper surface of a stream of molten glass flowing under it.

9. The counter-lock according to claim 8, characterized in that the plurality of longitudinally extending outlets are provided with a cooling medium outlet of the compensation or equilibrium section placed centrally above the stream of molten glass flowing low. this.

10. The counter-lock according to claim 9, characterized in that the exit of the cooling means from the compensation section is formed by a recessed portion at one end of one of the dome block elements of the compensation section and a recessed portion, opposite one end of one of the vault block elements of the adjacent compensation section.

11. The counter-lock according to claim 1, characterized in that the passage generally extends transversely from the dome block element.

12. A counter-lock for cooling molten glass from a glass melting furnace as it flows to a forming machine, the counter-fire is characterized in that it comprises: a passage, generally insulated which extends generally horizontally, having an inlet end adapted to receive molten glass from a glass melting furnace and an outlet end adapted to discharge molten glass discharge to a forming machine; a vault structure covering at least a portion of the insulated passage, the vault structure comprises a series of refractory vault block elements extending longitudinally, each of the vault block elements being of one piece construction and extending transversely from the insulated passage from one side of the insulated passage to the other side of the insulated passage, each of the dome block elements has an internal surface with first and second concave surface portions extending longitudinally and facing downwards, a third portion of concave surface extending longitudinally and downwardly between the first and second concave surface portions facing downwards and first and second convex surface portions extending longitudinally and facing downwards, one of the first and second portions of convex surface is placed between the third portion of Concave surface and one of the first and second concave surface portions and is adapted to prevent substantial heat transfer between them, the other of the first and second convex surfaces is placed between the third portion of the concave surface and the other portion of the concave surface. First and second concave surface portions are adapted to prevent substantial heat transfer between them, a plurality of longitudinally extending passages in the dome structure, each of the passages • ends in an opening positioned between the first and second portions convex surface, to introduce a cooling medium in the counterclockwise in direct contact with the third portion of concave surface of the inner surface, at least one outlet of cooling medium of the counterclock, at least one outlet of cooling medium is longitudinally separated from at least some of the passages, to extract the cooling medium Countercrisol; first and second pluralities of burners extending generally in the transverse direction, generally opposite, extending longitudinally, the burners of the first plurality heat in a first space below the first portion of the concave surface, the burners of the second plurality they heat in a second space below the second portion of concave surface; and first and second exhaust passages for expelling the combustion products of the first and second spaces, respectively, the first exhaust passage is longitudinally separated from at least some of the first plurality of burners, the second exhaust passage being longitudinally separated. of at least some of the second plurality of burners.

13. The counter-lock according to claim 12, characterized in that it further comprises: a refractory bridge element that extends through the insulated passage at a location between the inlet end and the outlet end, the refractory bridge element projects downwardly towards the level of the molten glass in the counter-lock and separates the counter-lock in a cooling section and a compensation or balance section, the counter-lock gradually becomes narrower in its transverse width as it proceeds from the refractory bridge element to the end of exit, the series of dome block elements is placed on the cooling section.

14. The counter-lock according to claim 12, characterized in that at least one cooling medium outlet is formed by a recessed portion at one end of one of the dome block elements and an opposite recessed portion at one end of one of the elements of adjacent vault blocks.

15. The counter-lock according to claim 12, characterized in that it further comprises: a second plurality of longitudinally extending passages in the dome structure, each of the second plurality of passages being opposite one of the first plurality of passages and ending in a second opening placed between the first and second convex surface portions for introducing additional cooling means into the counter-lock in direct contact with the third concave surface portion of the inner surface.

16. The counter-lock according to claim 13, characterized in that at least a portion of the insulated passages extends substantially from the inlet end to the refractory bridge element.

17. The counter-lock according to claim 13, characterized in that it further comprises: at least one vault block element of compensation or balance section covering at least a portion of the compensation section, the vault block element of the section of The compensation has an internal surface whose shape, in its cross-section, is similar to that of each of the vault block elements, the internal surface of the at least one vault block element of the compensation section further has a bevel longitudinal direction to gradually decrease the distance between the internal surface of the vault block element of the compensation section and an upper surface of a stream of molten glass flowing under it.

18. The counter-lock according to claim 12, characterized in that it further comprises: a plurality of longitudinally extending and extending substantially covering vault block elements of the balance section and covering substantially the entire compensation section, each of the block elements The vault of the compensation section has an internal surface whose shape, in the cross section, is similar to that of each of the vault block elements, the internal surface in each of the vault block elements of the section also has a bevel, in the longitudinal direction, to gradually decrease the distance between the internal surface of each of the vault block elements of the compensation section and an upper surface of a stream of molten glass flowing under this .

19. The counter-lock according to claim 18, characterized in that the plurality of longitudinally extending outlets is provided with an outlet of cooling medium in the compensation or equilibrium section placed centrally above the stream of molten glass flowing under she.

20. The counter-lock according to claim 19, characterized in that the cooling medium outlet of the compensation section is formed by a recessed portion at one end of one of the vault block elements of the compensation section and an opposite recessed portion. at one end of one of the vault block elements of the adjacent compensation section.

21. The counter-lock according to claim 12, characterized in that each of the plurality of passages extends generally in the transverse direction from the dome structure.