EP0031571B1 - Boiler - Google Patents
Boiler Download PDFInfo
- Publication number
- EP0031571B1 EP0031571B1 EP80108096A EP80108096A EP0031571B1 EP 0031571 B1 EP0031571 B1 EP 0031571B1 EP 80108096 A EP80108096 A EP 80108096A EP 80108096 A EP80108096 A EP 80108096A EP 0031571 B1 EP0031571 B1 EP 0031571B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ribs
- boiler
- heating
- flue gas
- flue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003546 flue gas Substances 0.000 claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 31
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 21
- 206010022000 influenza Diseases 0.000 claims abstract description 20
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 230000001419 dependent effect Effects 0.000 claims abstract 2
- 239000003921 oil Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
- F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
- F24H1/28—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes
- F24H1/285—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body including one or more furnace or fire tubes with the fire tubes arranged alongside the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/001—Guiding means
- F24H9/0026—Guiding means in combustion gas channels
Definitions
- the invention relates to a heating boiler in which a horizontal combustion chamber closed by an end wall for the arrangement of a gas or oil burner is designed as a cast iron body integral with heating gas trains, the heating gas trains provided with ribs and narrowing in the flow direction of the flue gases parallel to arranged in the combustion chamber and connected to a flue gas nozzle via a flue gas collector.
- Boilers are designed for heating domestic water. Controlling the relevant boiler temperatures results in a critical limit value of around 45 ° C, since falling below this temperature leads to the separation of acidic condensate from the flue gases and thus causes the boiler walls to corrode. In order to obtain a favorable use of the energy used, however, the boiler temperatures should be lower than this critical limit. Suitable countermeasures must then be taken to prevent such corroding of the boiler walls by the acidic condensate of the flue gases.
- the heating gas flues are connected to a front flue gas chamber, in which the flue gases flowing from the combustion chamber are deflected into the heating gas flues, changing their flow direction. Because the redirection of the flue gases takes place in an uncontrolled manner in this front flue gas chamber, there is a more or less large build-up of flue gases, especially at the inlet cross-sections of the heating gas flues, which promotes condensate formation at this point with a correspondingly increased risk of the boiler walls corroding.
- the invention as characterized in the claims, achieves the object of providing a heating boiler which can operate at low boiler temperatures without the risk of the formation of acidic condensate from the flue gases.
- the advantages achieved by the invention lie essentially in the fact that the design of the combustion chamber which is closed with an end wall makes it possible to provide a cavity which surrounds the combustion chamber and which can be used for filling purposes with cooling water for direct cooling of the combustion chamber.
- the complete equalization of the flue gas flow which can be achieved primarily with the course of the fins and their dimensions, also results in completely constant heat dissipation conditions along the entire flow path, so that any local increased condensate formation is suppressed with this and with the avoidance of local congestion effects for the flue gases and therefore practically no danger for there is corroding of the boiler walls.
- heating boilers (DE-B-1 679 396) to also form a horizontal combustion chamber, which is provided for the arrangement of a gas or oil burner, closed by an end wall.
- a front overflow chamber in which water-finned tubes aligned parallel to the flue gas flow can be arranged, which, like the combustion chamber, have an oval or also round cross-section that is constantly narrowing in the flow direction of the flue gases, are transverse to the flue gas flow Aligned and thus a series of individual baffles resulting ribs are provided, which prevent a uniformity of the flue gas flow.
- the individual heating gas flues which are also connected to an overflow chamber, have a rectangular flow cross section which is invariable along the entire flow path of the flue gases and are provided with ribs on the side surfaces of the cross-section which are longer than that
- the axis of the combustion chamber is parallel to the direction of flow of the flue gases.
- the heating boiler which is designed as a one-piece cast iron body 1, has a casting skin enriched with silicon and is provided with a horizontal combustion chamber 2, the volume of which is substantially equal to the flame volume of an oil arranged in the combustion chamber with the attachment to a pivotably arranged boiler door (not shown). or gas burner.
- the axial length of this combustion chamber 2 corresponds essentially to the depth of the cast iron body 1.
- the combustion chamber 2 is closed by an end wall 3 on which a spiral ribbing 4 is formed, which results in a swirl flow of the flue gases which is concentric with the longitudinal axis of the combustion chamber.
- the remaining area of the inner wall of the combustion chamber 2 is smooth.
- a front wall 5 of the cast iron body 1 is provided with mutually parallel, equally spaced ribs 6, which have a rectangular full cross section exhibit.
- the height of these ribs 6 is equal to their double spacing, so that, taking into account the boundary layer thickness that is relevant for the flue gases, there is no impairment of the flue gas flow and, at the same time, an optimal heat exchange is obtained.
- the cast iron body 1 further comprises four heating gas flues 7 arranged parallel to the combustion chamber 2, all of which have an essentially rectangular flow cross section and narrow in the direction of flow of the flue gases.
- each heating gas flue 7 is aligned horizontally and the lower boundary wall 9 has an incline falling towards the front wall 5, so that the outlet cross section of each heating gas flue 7 is smaller than its inlet cross section.
- the heating gas flues 7 end on a rear wall 12 of the cast iron body 1 which is provided with ribs 11 and which is designed as a flue gas collector. Because the temperature of the flue gases on this rear wall 12 is lower than on the front wall 5, the ribs 11 are arranged at a distance different from the ribs 6 of the front wall 5 while maintaining the same ratio to the rib height. The height of the ribs 6 and the ribs 11 on the front wall 5 and on the rear wall 12 and also the height of the ribs 10 of the heating gas flues 7 is twice their distance.
- a flue gas nozzle (not shown) is also connected to the flue gas collector formed by the rear wall 12 of the cast iron body 1. Furthermore, at the lower end of the cast iron body 1 there is also a water connection 13 for the supply of cooling water into the boiler cavity and at the upper end two further connections 14 and 15 for connection to the feed and return system for the domestic water.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Heizungskessel, bei dem eine durch eine Stirnwand geschlossene horizontale Brennkammer für die Anordnung eines Gas- oder Ölbrenners als ein mit Heizgaszügen einstückiger Gusseisenkörper ausgebildt ist, wobei die mit Rippen versehenen und sich in der Strömungsrichtung der Rauchgase verengenden Heizgaszüge parallel zu der Brennkammer angeordnet und über einen Rauchgassammler mit einem Rauchgasstutzen verbunden sind.The invention relates to a heating boiler in which a horizontal combustion chamber closed by an end wall for the arrangement of a gas or oil burner is designed as a cast iron body integral with heating gas trains, the heating gas trains provided with ribs and narrowing in the flow direction of the flue gases parallel to arranged in the combustion chamber and connected to a flue gas nozzle via a flue gas collector.
Heizungskessel sind für die Erwärmung von Brauchwasser vorgesehen. Bei der Steuerung der dafür massgeblichen Kesseltemperaturen ergibt sich ein bei etwa 45°C liegender kritischer Grenzwert, da ein Unterschreiten dieser Temperatur zu der Abscheidung eines sauren Kondensats aus den Rauchgasen führt und somit eine Korrodierung der Kesselwände verursacht. Um eine günstige Ausnutzung der eingesetzten Energie zu erhalten, sollten jedoch die Kesseltemperaturen niedriger als dieser kritische Grenzwert liegen. Es sind dann aber geeignete Gegenmassnahmen zur Verhinderung einer solchen Korrodierung der Kesselwände durch das saure Kondensat der Rauchgase zu treffen.Boilers are designed for heating domestic water. Controlling the relevant boiler temperatures results in a critical limit value of around 45 ° C, since falling below this temperature leads to the separation of acidic condensate from the flue gases and thus causes the boiler walls to corrode. In order to obtain a favorable use of the energy used, however, the boiler temperatures should be lower than this critical limit. Suitable countermeasures must then be taken to prevent such corroding of the boiler walls by the acidic condensate of the flue gases.
Bei den bekannten Heizungskesseln gemäss dem Oberbegriff des Patentanspruchs 1 (FR-A-2198 610) sind die Heizgaszüge an eine vordere Rauchgaskammer angeschlossen, in welcher die aus der Brennkammer zuströmenden Rauchgase unter Änderung ihrer Strömungsrichtung eine Umlenkung in die Heizgaszüge erfahren. Weil die Umlenkung der Rauchgase in dieser vorderen Rauchgaskammer unkontrolliert stattfindet, kommt es dabei insbesondere an den Einlassquerschnitten der Heizgaszüge zu einem mehr oder weniger grossen Stau der Rauchgase, womit an dieser Stelle eine Kondensatbildung mit einer entsprechend erhöhten Gefahr für eine Korrodierung der Kesselwände gefördert wird. Eine solche stärkere Kondensatbildung ergibt sich auch innerhalb der einzelnen Heizgaszüge, wenn in diesen zur Aufrechterhaltung einer bei diesen bekannten Heizungskessein bezweckten turbulenten Rauchgasströmung spiralförmig ausgebildete Rippen vorgesehen sind, wobei insoweit eine deshalb kritischere Korrosionsgefahr besteht, weil mit einem solchen spiralförmigen Verlauf der Rippen bzw. der dadurch geschaffenen turbulenten Rauchgasströmung eine Kondensatbildung an unregelmässig verteilten Stellen erhalten wird. Diese erhöhte Korrosionsgefahr besteht bei den bekannten Heizungskesseln insbesondere dann, wenn sie aus Gründen einer Energieeinsparung mit niedrigen Kesseltemperaturen betrieben werden.In the known heating boilers according to the preamble of claim 1 (FR-A-2198 610), the heating gas flues are connected to a front flue gas chamber, in which the flue gases flowing from the combustion chamber are deflected into the heating gas flues, changing their flow direction. Because the redirection of the flue gases takes place in an uncontrolled manner in this front flue gas chamber, there is a more or less large build-up of flue gases, especially at the inlet cross-sections of the heating gas flues, which promotes condensate formation at this point with a correspondingly increased risk of the boiler walls corroding. Such a stronger formation of condensate also occurs within the individual heating gas flues if spirally designed fins are provided in order to maintain a turbulent flue gas flow intended for these known heating boilers, whereby there is therefore a more critical risk of corrosion, because with such a spiral course of the fins or turbulent flue gas flow created thereby, condensate formation is obtained at irregularly distributed locations. This increased risk of corrosion exists in the known heating boilers in particular when they are operated at low boiler temperatures in order to save energy.
Die Erfindung, wie sie in den Patentansprüchen gekennzeichnet ist, löst die Aufgabe, einen Heizungskessel bereitzustellen, der ohne die Gefahr der Bildung des sauren Kondensats der Rauchgase mit niedrigen Kesseltemperaturen arbeiten kann.The invention, as characterized in the claims, achieves the object of providing a heating boiler which can operate at low boiler temperatures without the risk of the formation of acidic condensate from the flue gases.
Die durch die Erfindung erreichten Vorteile liegen im wesentlichen darin, dass durch die mit einer Stirnwand geschlossene Ausbildung der Brennkammer ein die Brennkammer umgebender Hohlraum bereitgestellt werden kann, der für Füllzwecke mit Kühlwasser zur unmittelbaren Kühlung der Brennkammer zu nutzen ist. Die hauptsächlich mit dem Verlauf der Rippen und deren Abmessungen erreichbare völlige Vergleichmässigung der Rauchgasströmung ergibt weiterhin entlang des gesamten Strömungsweges völlig gleichbleibende Wärmeableitverhältnisse, so dass damit und mit der Vermeidung von örtlichen Stauwirkungen für die Rauchgase jede örtliche verstärkte Kondensatbildung unterdrückt wird und deshalb praktisch keine Gefahr für eine Korrodierung der Kesselwände besteht.The advantages achieved by the invention lie essentially in the fact that the design of the combustion chamber which is closed with an end wall makes it possible to provide a cavity which surrounds the combustion chamber and which can be used for filling purposes with cooling water for direct cooling of the combustion chamber. The complete equalization of the flue gas flow, which can be achieved primarily with the course of the fins and their dimensions, also results in completely constant heat dissipation conditions along the entire flow path, so that any local increased condensate formation is suppressed with this and with the avoidance of local congestion effects for the flue gases and therefore practically no danger for there is corroding of the boiler walls.
Es ist für Heizungskessel noch bekannt (DE-B-1 679 396),eineauchdabeifürdieAnordnungeines Gas- oder Ölbrenners vorgesehene horizontale Brennkammer durch eine Stirnwand geschlossen auszubilden. In den an eine vordere Überströmkammer, in denen parallel zu der Rauchgasströmung ausgerichtete wasserführende Rippenrohre angeordnet sein können, angeschlossenen Heizgaszügen, die wie die Brennkammer einen ovalen oder aber auch runden, sich in der Strömungsrichtung der Rauchgase stetig verengenden Querschnitt aufweisen, sind quer zu der Rauchgasströmung ausgerichtete und mithin eine Aneinanderreihung einzelner Prallflächen ergebende Rippen vorgesehen, die eine Vergleichmässigung der Rauchgasströmung verhindern. Bei einem weiteren bekannten Heizungskessel (DE-A-1 804 020) weisen die einzelnen auch dabei an eine Überströmkammer angeschlossenen Heizgaszüge einen längs des gesamten Strömungsweges der Rauchgase unveränderlichen rechteckförmigen Strömungsquerschnitt auf und sind an den querschnittslängeren Seitenflächen mit Rippen versehen, die in der zu der Achse der Brennkammer parallelen Strömungsrichtung der Rauchgase verlaufen.It is still known for heating boilers (DE-B-1 679 396) to also form a horizontal combustion chamber, which is provided for the arrangement of a gas or oil burner, closed by an end wall. In the hot gas flues connected to a front overflow chamber, in which water-finned tubes aligned parallel to the flue gas flow can be arranged, which, like the combustion chamber, have an oval or also round cross-section that is constantly narrowing in the flow direction of the flue gases, are transverse to the flue gas flow Aligned and thus a series of individual baffles resulting ribs are provided, which prevent a uniformity of the flue gas flow. In another known heating boiler (DE-A-1 804 020), the individual heating gas flues, which are also connected to an overflow chamber, have a rectangular flow cross section which is invariable along the entire flow path of the flue gases and are provided with ribs on the side surfaces of the cross-section which are longer than that The axis of the combustion chamber is parallel to the direction of flow of the flue gases.
Die Erfindung wird nachfolgend anhand der lediglich einen Ausführungsweg darstellenden Zeichnung näher erläutert. Es zeigt:
- Fig. 1 eine Stirnansicht eines Heizungskessels,
- Fig. 2 eine Schnittansicht des Heizungskessels nach der Linie 11-11 in Fig. 1 und
- Fig. 3 die Stirnansicht der Rückseite des Heizungskessels.
- 1 is an end view of a boiler,
- Fig. 2 is a sectional view of the boiler according to the line 11-11 in Fig. 1 and
- Fig. 3 is an end view of the back of the boiler.
Der als ein einstückiger Gusseisenkörper 1 ausgebildete Heizungskessel weist eine mit Silizium angereicherte Gusshaut auf und ist mit einer horizontalen Brennkammer 2 versehen, deren Volumen im wesentlichen gleich dem Flammenvolumen eines in der Brennkammer mit der Befestigung an einer schwenkbar angeordneten Kesseltür (nicht dargestellt) angeordneten Öl- oder Gasbrenners sein sollte. Die axiale Länge dieser Brennkammer 2 entspricht dabei im wesentlichen der Tiefe des Gusseisenkörpers 1. Die Brennkammer 2 ist durch eine Stirnwand 3 geschlossen, an der eine spiralförmige Verrippung 4 ausgebildet ist, die eine zu der Längsachse der Brennkammer konzentrische Drallströmung der Rauchgase ergibt. Der restliche Bereich der Innenwand der Brennkammer 2 ist glatt ausgebildet.The heating boiler, which is designed as a one-piece cast iron body 1, has a casting skin enriched with silicon and is provided with a
Eine Vorderwand 5 des Gusseisenkörpers 1 ist mit zueinander parallelen, abstandsgleichen Rippen 6 versehen, die einen rechteckigen Vollquerschnitt aufweisen. Die Höhe dieser Rippen 6 ist gleich ihrem doppelten Abstand, um so unter Berücksichtigung der für die Rauchgase massgeblichen Grenzschichtdicke keine Beeinträchtigung der Rauchgasströmung zu ergeben und gleichzeitig einen optimalen Wärmetausch zu erhalten. Der Gusseisenkörper 1 umfasst weiterhin vier parallel zu der Brennkammer 2 angeordnete Heizgaszüge 7, die alle einen im wesentlichen rechteckigen Strömungsquerschnitt haben und sich in der Strömungsrichtung der Rauchgase verengen. Die Verengung ist dadurch erhalten, dass die obere Begrenzungswand 8 jedes Heizgaszuges 7 horizontal ausgerichtet ist und die untere Begrenzungswand 9 eine gegen die Vorderwand 5 abfallende Neigung aufweist, womit der Austrittsquerschnitt jedes Heizgaszuges 7 kleiner ist als dessen Eintrittsquerschnitt. Mit dieser stetigen Verengung der einzelnen Heizgaszüge 7 wird eine Vergleichmässigung der Rauchgasströmung in Abhängigkeit von der infolge einer entsprechend stetigen Abkühlung der Rauchgase stattfindenden Volumenminderung erhalten, wobei diese Vergleichmässigung der Rauchgasströmung weiterhin durch Rippen 10 unterstützt wird, die an den querschnittslängeren Seitenflächen der Heizgaszüge 7 abstandsgleich angeordnet sind und in der Strömungsrichtung der Rauchgase verlaufen. Da auch diese Rippen 10 wie die glatte Bodenfläche an der unteren Begrenzungswand 9 eine gegen die Vorderwand 5 abfallende Neigung aufweisen, wird alles Kondensat der Rauchgase, das sich evtl. nur beim Anheizen des Heizungskessels in diesen Heizgaszügen bilden kann, hin zu der regelmässig heisseren Brennkammer 2 abgeleitet, um dort sofort verdampft zu werden.A
Die Heizgaszüge 7 enden an einer mit Rippen 11 versehenen Rückwand 12 des Gusseisenkörpers 1, die als Rauchgassammler ausgebildet ist. Weil die Temperatur der Rauchgase an dieser Rückwand 12 niedriger ist als an der Vorderwand 5, sind die Rippen 11 in einem von den Rippen 6 der Vorderwand 5 abweichenden Abstand unter Einhaltung desselben Verhältnisses zu der Rippenhöhe angeordnet. Die Höhe der Rippen 6 und der Rippen 11 an der Vorderwand 5 und an der Rückwand 12 sowie auch die Höhe der Rippen 10 der Heizgaszüge 7 ist gleich ihrem doppelten Abstand.The heating gas flues 7 end on a
Mit dem durch die Rückwand 12 des Gusseisenkörpers 1 gebildeten Rauchgassammler ist noch ein Rauchgasstutzen (nicht dargestellt) verbunden. Weiterhin sind an dem unteren Ende des Gusseisenkörpers 1 noch ein Wasseranschluss 13 für die Zuleitung von Kühlwasser in den Kesselhohlraum sowie an dem oberen Ende zwei weitere Anschlüsse 14 und 15 zum Anschluss an das Vor- und Rücklaufsystem für das Brauchwasser vorgesehen.A flue gas nozzle (not shown) is also connected to the flue gas collector formed by the
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80108096T ATE5438T1 (en) | 1979-12-28 | 1980-12-22 | BOILER. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2952564A DE2952564C1 (en) | 1979-12-28 | 1979-12-28 | Boiler |
| DE2952564 | 1979-12-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0031571A1 EP0031571A1 (en) | 1981-07-08 |
| EP0031571B1 true EP0031571B1 (en) | 1983-11-23 |
Family
ID=6089776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80108096A Expired EP0031571B1 (en) | 1979-12-28 | 1980-12-22 | Boiler |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0031571B1 (en) |
| AT (1) | ATE5438T1 (en) |
| DE (1) | DE2952564C1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4400400A1 (en) * | 1994-01-08 | 1995-07-13 | Viessmann Werke Kg | Three-pass boiler |
| EP0745813A3 (en) * | 1995-05-31 | 1997-12-29 | VIESSMANN WERKE GmbH & CO. | Heat exchanger, especially for a boiler |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1508762A1 (en) * | 1966-07-01 | 1970-03-05 | Arnold Hellmut | Process for producing stainless steel castings and stainless steel castings |
| DE1804020A1 (en) * | 1968-10-19 | 1970-04-30 | Variotherm S A | Boiler for hot water heating |
| FR2198610A5 (en) * | 1972-08-31 | 1974-03-29 | Mimric Guy | |
| DE1679396B2 (en) * | 1967-01-12 | 1976-08-12 | Gustav Ospelt, Hovaltwerk Ag, Vaduz | HEATING BOILERS FOR LIQUID OR GAS FUELS |
| DE2735353A1 (en) * | 1977-08-05 | 1979-02-08 | Hans Viessmann | Sectional boiler made from cast iron - has joints with draining features preventing corrosion-inducing condensate formation |
| DE7914459U1 (en) * | 1979-05-18 | 1979-09-06 | Heim, Kurt, 7520 Bruchsal | FINED INTERNAL PIPE FOR COMPRESSED GAS OR COMPRESSED OIL BOILERS |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE6803092U (en) * | 1968-10-04 | 1969-02-13 | Variotherm S A Fa | BOILERS FOR HOT WATER HEATING |
| DE6900397U (en) * | 1969-01-06 | 1969-05-29 | Hovalwerk Ag Ospelt | BOILERS FOR FIRING LIQUID OR GAS FUELS |
| DE2408500B2 (en) * | 1974-02-22 | 1977-09-15 | Karl Schmidt Gmbh, 7107 Neckarsulm | METHOD FOR PRODUCING COMPONENTS OF CAST IRON WITH SPHERICAL GRAPHITE |
| DE2645717C3 (en) * | 1976-10-09 | 1979-10-25 | Hans 3559 Battenberg Viessmann | Boilers for liquid or gaseous fuels |
-
1979
- 1979-12-28 DE DE2952564A patent/DE2952564C1/en not_active Expired
-
1980
- 1980-12-22 AT AT80108096T patent/ATE5438T1/en not_active IP Right Cessation
- 1980-12-22 EP EP80108096A patent/EP0031571B1/en not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1508762A1 (en) * | 1966-07-01 | 1970-03-05 | Arnold Hellmut | Process for producing stainless steel castings and stainless steel castings |
| DE1679396B2 (en) * | 1967-01-12 | 1976-08-12 | Gustav Ospelt, Hovaltwerk Ag, Vaduz | HEATING BOILERS FOR LIQUID OR GAS FUELS |
| DE1804020A1 (en) * | 1968-10-19 | 1970-04-30 | Variotherm S A | Boiler for hot water heating |
| FR2198610A5 (en) * | 1972-08-31 | 1974-03-29 | Mimric Guy | |
| DE2735353A1 (en) * | 1977-08-05 | 1979-02-08 | Hans Viessmann | Sectional boiler made from cast iron - has joints with draining features preventing corrosion-inducing condensate formation |
| DE7914459U1 (en) * | 1979-05-18 | 1979-09-06 | Heim, Kurt, 7520 Bruchsal | FINED INTERNAL PIPE FOR COMPRESSED GAS OR COMPRESSED OIL BOILERS |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0031571A1 (en) | 1981-07-08 |
| DE2952564C1 (en) | 1981-12-10 |
| ATE5438T1 (en) | 1983-12-15 |
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