GB1596616A - Heat exchanger for a gas- or oil-fired continuous-flow water heater - Google Patents
Heat exchanger for a gas- or oil-fired continuous-flow water heater Download PDFInfo
- Publication number
- GB1596616A GB1596616A GB22727/78A GB2272778A GB1596616A GB 1596616 A GB1596616 A GB 1596616A GB 22727/78 A GB22727/78 A GB 22727/78A GB 2272778 A GB2272778 A GB 2272778A GB 1596616 A GB1596616 A GB 1596616A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heat exchanger
- cover plate
- hot water
- water pipe
- pipe coil
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 93
- 238000010276 construction Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000005476 soldering Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 239000008236 heating water Substances 0.000 claims description 3
- 230000010259 detection of temperature stimulus Effects 0.000 claims description 2
- 210000005069 ears Anatomy 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
-
- 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
- F24H1/48—Water heaters for central heating incorporating heaters for domestic water
- F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
-
- 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
- F24H1/48—Water heaters for central heating incorporating heaters for domestic water
- F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
- F24H1/526—Pipes in pipe heat exchangers for sanitary water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
- F28D7/0083—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with units having particular arrangement relative to a supplementary heat exchange medium, e.g. with interleaved units or with adjacent units arranged in common flow of supplementary heat exchange medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Details Of Fluid Heaters (AREA)
- Cookers (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Description
(54) HEAT EXCHANGER FOR A GAS- OR OIL-FIRED
CONTINUOUS-FLOW WATER HEATER
(71) We, ROBERT BOSCH GMBH, a
German company of Postfach 50, 7 Stuttgart 1, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to a heat exchanger for a gas- or oil-fired continuousflow water heater used both to heat up water in a central heating system and to prepare hot tap water. The heat exchanger comprises an assembly of fins, a plurality of hot water pipes which pass through the assembly and a mains water pipe coil having straight sections extending inside the hot water pipes.
A heat exchanger of this type is already known (French Patent Specification 1 422 247) wherein each end of a hot water pipe is provided with a cover plate into which one end of a curved pipe portion is soldered in order to join together two adjacent hot water pipes. The ends of the straight sections of the mains water pipe coil extending into the hot water pipes protrude in a sealed manner through the cover plates and are joined together in pairs by way of curved pipe portions which are located immediately beside the curved portions of the hot water pipes. This construction is relatively complicated and unsuitable for heat exchangers wherein several adjacent hot water pipes are to be connected one parallel with the other and are to have hot water flowing therethrough.
In another known heat exchanger each end of the hot water pipes at each end of the assembly of fins is soldered into a respective base plate, upon which several cover plates are placed, these cover plates each forming a respective chamber which joins two adjacent hot water pipes, between the cover plate and the base plate. It is true that in this embodiment the curved portions for the hot water pipes are omitted, but the ends, connected by way of curved portions, of the straight sections of the mains water pipes are guided through the cover plates and soldered therein, so that high manufacturing costs are produced just as before because of the large number of cover plates.
There is provided by the present invention a heat exchanger for a gas- or oil-firedcontinuous-flow water heater, comprising an assembly of fins, a plurality of hot water pipes which pass through the assembly and a mains water pipe coil having straight sections extending inside and through the hot water pipes which are each soldered into a base plate at both ends of the assembly and open out into chambers which are formed between the base plates and cover plates placed upon these base plates, the chambers located at one end of the assembly being formed by a common cover plate and by dividing walls formed by the common cover plate and/or the respective base plate, and the cover plates also surrounding curved portions provided to join together straight sections of the mains water pipe coil.
By comparison with the known constructions, the heat exchanger according to the invention has the advantage that only one single cover plate has to be soldered or welded to the base plate at each end of the assembly of fins, and that passing of the curved portions of the mains water pipe coil, entailing further soldering work, through the cover plates is entirely eliminated. The arrangement of these curved portions inside the chambers for the hot water is also advantageous because the heat transfer surface between the hot water and the mains water is thereby increased. The arrangement of one common cover plate enables several hot water pipes to be connected in parallel economically. and this may be very advantageous in certain cases.The edges of the cover plate and base plate which are to be joined together are easily accessible, so that the soldering or welding process necessary therefor is also facilitated. Thus, a radially disposed welding electrode may be advantageously guided along the edge of the parts or vice versa.
In the case of heat exchangers which have several chambers for the supply, discharge and deflection of the hot water at at least one end of the assembly of fins, a particularly simple embodiment is produced when the dividing walls of the chambers are formed by flange-like recesses in the common cover plate and/or raised portions of the respective base plate. In this case, the edge of the common cover plate may advantageously be soldered or welded to the base plate, whereas the flange like recesses in the cover plate, serving as dividing walls for the chambers, each form a labryinth seal with the respective base plate or with its raised portions, as the case may be.
A space-saving embodiment is produced when the connections for the heating water are provided adjacent what is in use of the heat exchanger, a lower side edge if the common cover plate and the connections for the mains water are provided adjacent what is in use of the heat exchanger, a lateral side edge of the common cover plate is a recessed section thereof.
Salt deposition in the mains water pipe system can be kept low when the mains water pipe coil has a two-part, reverse flow construction in which the two parts run parallel and directly adjacent to one another. In this case, it is appropriate for the ends of the two parts of the mains water pipe coil, passing through the common cover plate, to be staggered some distance away from each other so that the intervening part of the cover plate permits satisfactory soldering of the pipe ends to the cover plate and for the two unions for the respective pipe ends be soldered then to lie disposed at an angle relative to each other.
This enables the mains water connections to lie inside the lateral profile of the cover plate, and they do not therefore increase the overall length of the heat exchanger.
Before the cover plates are joined to the base plates, the ends of the hot water pipes are already soldered into the base plates. By joining the cover plates to the base plates, the soldered joints between the base plates and the hot water pipes undergo lower thermal stress when, according to a further proposal of the invention, the base plates are constructed as drawn sheet metal parts with a raised edge flange.
The assembly of the heat exchanger is simplified when the cover plates are designed as an axial stop for the curved portions of the mains water pipe coil.
An embodiment of the invention is shown in the accompanying drawing in which:
Figure I is a side view of the heat exchanger, and
Figure 2 is a part section along the line II-II in Figure 1.
The heat exchanger has an assembly of fins 10, through central holes of which six hot water pipes 11 are conducted. The individual fins of the assembly thereof 10 are provided with collars 12 at the central holes, the fins being soldered to the hot water pipes 11 by means of these collars.
The ends of the hot water pipes 11, on both ends of the assembly of fins 10, are each soldered into a respective base plate 13 formed as a piece of drawn sheet metal with a raised flange edge 14. The base plates 13 at both ends of the assembly have the same shape and this simplifies manufacture and stock-keeping. Placed upon the base plate 13, as seen on the left in Figure 2, is a cover plate 16 which is also formed by a piece of drawn sheet metal with a flange edge 17 and is welded tightly to this flange edge with the base plate 13. The cover plate 16 has a recess 18 which abuts on a small outwardly bowed portion 19 of the base plate 13, and forms with this portion 19 a seal between two chambers 20 and 21.The three hot water pipes 11 which appear uppermost as they are seen in the drawing, at the left hand side thereof, open out into the chamber 20, and the three thereof which appear lowermost, open out at the same end into chamber 21. The base plate 13 on the right of the drawing of Figure 2 forms with a cover plate 22, a chamber 23 into which all six hot water pipes 11 at their right hand end as seen in Figure 2 open out. The chamber 20 is provided with a pipe union 24 (Figure 1) for a heating feed line, and the chamber 21 is provided with a pipe union 25 for a heating return line. Both unions 24 and 25 are disposed at what is, in use of the heat exhanger, the lower edge side 26 of the cover plate 16, so that the pipes which are to be connected thereto do not increase the overall width of the heat exchanger. In the chamber 23, the hot water supplied by way of the chamber 21 through the three of the hot water pipes 11 which appear lowermost as seen in the drawing is diverted into the three hot water pipes 11 which appear uppermost in the drawing, whence the water reaches the heating feed line by way of the chamber 20.
The heat exchanger is also provided with a mains water pipe coil 30 whose straight sections 31 extend through the hot water pipes 11. The straight sections 31 are joined externally of the hot water pipes 11 by curved portions 32 and 33 which are disposed inside the chambers 20, 2123 and are thus surrounded by hot water. The curved portions 33 are integrally moulded onto the straight sections 31 of the mains water pipe coil, whilst the curved portions 32 are soldered onto these sections.The mains water pipe coil 30 is of what may be called a reversed, two-part, construction, i.e. it has a first-part 34 on the inlet side i.e. the side nearest the source of the gas or oil burner, which appears in Figure 1 on the left-hand side, and, a second in this instance, duplicate, part 35 on the outlet side which is seen from above in Figure 2 and thus hides from view the first part 34. The two parts 34 and 35 are located directly one on top of the other, have a circular cross-section and, for retaining their position in the hot water pipes 11, are provided on the outer periphery with individual knobs or ears 36 (Figure 1) which touch the inner wall of the hot water pipes 11.The connecting ends 37 and 38 of the two parts 34 and 35 are bent in such a manner and are such a length that they pass through the cover plate 16 with a sufficient separation between them to render satisfactory soldering possible. In the region of the connecting ends 37 and 38, the cover plate 16 is recessed at 42 for accomodating connecting pieces 43 and 44 which are soldered onto the ends 37 and 38.
Internally of the chamber 20, the two parts 34 and 35 of the mains water pipe coil 30 are also inclined away from each other and joined together by way of a 1800 curved portion 45 which in use the heat exchanger is also surrounded by hot water.
Moulded onto the wall of the chamber 20 is a union 48 (Figure 1) having a bore 50 (Figure 2) which serves to accomodate a feed temperature gauge constituted by, e.g., an NTC (negative temperature coefficient of resistance) resistor. Because of the position chosen for the bore 50, the gauge extends into the space between the curved portions 32 and 45 in the chamber 20, thus producing a particularly good circulation of water around the gauge and consequently a low-inertia detection of temperature changes.
The heat exchanger is easily assembled so that the fins and the base plates 13 are initially soldered to the hot water pipes 11 and then the straight sections 31 of the mains water pipe, which are joined in pairs by way of the curved portions 33, are inserted into the hot water pipes 11 from the side of the chamber 23. Afterwards, the curved portions 32 and 45 are soldered onto the free ends of the sections 31, and the cover plates 16 and 22 are placed upon the base plates 13 and welded thereto at the edge. The recess 18 in the cover plate 16 thereby abuts the raised portion 19 on the base plate 13, so that the two chambers 20 and 21 are formed and are adequately sealed one from the other without any additional measures.Finally, in one working operation, the connecting ends 37 and 38 of the mains water pipe coil 30 are each soldered to the cover plate 16 and the pieces 42 and 43 respectively. The cover plate 27 thereby ensures that the connecting ends 37 and 38 cannot be deflected towards the fin assembly 10.
The above-described embodiment is also described in copending application No.
22726/78 (Serial No, 1596615).
WHAT WE CLAIM IS:
1. A heat exchanger for a gas- or oilfired continuous-flow water heater, comprising an assembly of fins, a plurality of hot water pipes which pass through the assembly and a mains water pipe coil having straight sections extending inside and through the hot water pipes which are each soldered into a base plate at both ends of the assembly and open out into chambers which are formed between the base plates and cover plates placed upon these base plates, the chambers located at one end of the assembly being formed by a common cover plate and by dividing walls formed by the common cover plate and/or the respective base plate, and the cover plates also surrounding curved portions provided to join together straight sections of the mains water pipe coil.
2. A heat exchanger as claimed in claim 1, wherein the dividing walls of the chambers are formed by flange-like recesses in the common cover plate and/or raised portions on the respective base plate.
3. A heat exchanger as claimed in claim 2, wherein the edges of the cover plates are soldered or welded to the base plates, whereas the flange-like recesses on the common cover plate, which serve as dividing walls for the respective chambers, each form a labyrinth seal with the respective base plate or with its raised portions as the case may be.
4. A heat exchanger as claimed in any of claims 1 to 3, wherein identical base plates are used at both ends of the assembly of fins.
5. A heat exchanger as claimed in any of the preceding claims, wherein the connections for the heating water are provided adjacent what is in use of the heat exchanger, the lower side edge of the common cover plate and the connections for the mains water are provided on a recessed section of the common cover plate adjacent what is in use of the heat exchanger a lateral side edge of the common cover plate.
6. A heat exchanger as claimed in any of the preceding claims, wherein the mains water pipe coil has a first part on the inlet side and a second part on the outlet side which runs parallel and adjacent to the first part, and the ends of the two parts are
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (12)
- **WARNING** start of CLMS field may overlap end of DESC **.portions 33 are integrally moulded onto the straight sections 31 of the mains water pipe coil, whilst the curved portions 32 are soldered onto these sections. The mains water pipe coil 30 is of what may be called a reversed, two-part, construction, i.e. it has a first-part 34 on the inlet side i.e. the side nearest the source of the gas or oil burner, which appears in Figure 1 on the left-hand side, and, a second in this instance, duplicate, part 35 on the outlet side which is seen from above in Figure 2 and thus hides from view the first part 34.The two parts 34 and 35 are located directly one on top of the other, have a circular cross-section and, for retaining their position in the hot water pipes 11, are provided on the outer periphery with individual knobs or ears 36 (Figure 1) which touch the inner wall of the hot water pipes 11. The connecting ends 37 and 38 of the two parts 34 and 35 are bent in such a manner and are such a length that they pass through the cover plate 16 with a sufficient separation between them to render satisfactory soldering possible. In the region of the connecting ends 37 and 38, the cover plate 16 is recessed at 42 for accomodating connecting pieces 43 and 44 which are soldered onto the ends 37 and 38.Internally of the chamber 20, the two parts 34 and 35 of the mains water pipe coil 30 are also inclined away from each other and joined together by way of a 1800 curved portion 45 which in use the heat exchanger is also surrounded by hot water.Moulded onto the wall of the chamber 20 is a union 48 (Figure 1) having a bore 50 (Figure 2) which serves to accomodate a feed temperature gauge constituted by, e.g., an NTC (negative temperature coefficient of resistance) resistor. Because of the position chosen for the bore 50, the gauge extends into the space between the curved portions 32 and 45 in the chamber 20, thus producing a particularly good circulation of water around the gauge and consequently a low-inertia detection of temperature changes.The heat exchanger is easily assembled so that the fins and the base plates 13 are initially soldered to the hot water pipes 11 and then the straight sections 31 of the mains water pipe, which are joined in pairs by way of the curved portions 33, are inserted into the hot water pipes 11 from the side of the chamber 23. Afterwards, the curved portions 32 and 45 are soldered onto the free ends of the sections 31, and the cover plates 16 and 22 are placed upon the base plates 13 and welded thereto at the edge. The recess 18 in the cover plate 16 thereby abuts the raised portion 19 on the base plate 13, so that the two chambers 20 and 21 are formed and are adequately sealed one from the other without any additional measures.Finally, in one working operation, the connecting ends 37 and 38 of the mains water pipe coil 30 are each soldered to the cover plate 16 and the pieces 42 and 43 respectively. The cover plate 27 thereby ensures that the connecting ends 37 and 38 cannot be deflected towards the fin assembly 10.The above-described embodiment is also described in copending application No.22726/78 (Serial No, 1596615).WHAT WE CLAIM IS: 1. A heat exchanger for a gas- or oilfired continuous-flow water heater, comprising an assembly of fins, a plurality of hot water pipes which pass through the assembly and a mains water pipe coil having straight sections extending inside and through the hot water pipes which are each soldered into a base plate at both ends of the assembly and open out into chambers which are formed between the base plates and cover plates placed upon these base plates, the chambers located at one end of the assembly being formed by a common cover plate and by dividing walls formed by the common cover plate and/or the respective base plate, and the cover plates also surrounding curved portions provided to join together straight sections of the mains water pipe coil.
- 2. A heat exchanger as claimed in claim 1, wherein the dividing walls of the chambers are formed by flange-like recesses in the common cover plate and/or raised portions on the respective base plate.
- 3. A heat exchanger as claimed in claim 2, wherein the edges of the cover plates are soldered or welded to the base plates, whereas the flange-like recesses on the common cover plate, which serve as dividing walls for the respective chambers, each form a labyrinth seal with the respective base plate or with its raised portions as the case may be.
- 4. A heat exchanger as claimed in any of claims 1 to 3, wherein identical base plates are used at both ends of the assembly of fins.
- 5. A heat exchanger as claimed in any of the preceding claims, wherein the connections for the heating water are provided adjacent what is in use of the heat exchanger, the lower side edge of the common cover plate and the connections for the mains water are provided on a recessed section of the common cover plate adjacent what is in use of the heat exchanger a lateral side edge of the common cover plate.
- 6. A heat exchanger as claimed in any of the preceding claims, wherein the mains water pipe coil has a first part on the inlet side and a second part on the outlet side which runs parallel and adjacent to the first part, and the ends of the two parts arestaggered some distance away from each other.
- 7. A heat exchanger as claimed in claim 6, wherein the unions soldered onto the ends of the two parts respectively for the connection of the mains water pipes, are disposed at an angle relative to each other.
- 8. A heat exchanger as claimed in any of the preceding claims, wherein the sections of the mains water pipe coil extending in the hot water pipes have a circular cross-section and are held at a distance from the inner wall of the hot water pipes.
- 9. A heat exchanger as claimed in any of the preceding claims, wherein the base plates are designed as drawn sheet metal parts with a flange edge.
- 10. A heat exchanger as claimed in any of the preceding claims, wherein the cover plate serves as an axial stop for the curved portions of the mains water pipe coil.
- 11. A heat exchanger as claimed in any of the preceding claims, wherein the chamber to receive a heating feed line, is provided with means for inserting a feed temperature gauge between the end curved sections of the mains water pipe coil.
- 12. A heat exchanger according to claim 1, for a gas- or oil-fired continuous-flow water heater, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2742820A DE2742820C2 (en) | 1977-09-23 | 1977-09-23 | Heat exchanger for a gas or oil heated instant water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1596616A true GB1596616A (en) | 1981-08-26 |
Family
ID=6019693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22727/78A Expired GB1596616A (en) | 1977-09-23 | 1978-05-25 | Heat exchanger for a gas- or oil-fired continuous-flow water heater |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT376491B (en) |
| DE (1) | DE2742820C2 (en) |
| ES (1) | ES473604A1 (en) |
| FR (1) | FR2404178A1 (en) |
| GB (1) | GB1596616A (en) |
| IT (1) | IT1110156B (en) |
| NL (1) | NL186031C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002050478A1 (en) * | 2000-12-20 | 2002-06-27 | Merloni Termosanitari S.P.A. | Bi-thermal heat exchanger in particular for condensing boilers |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7927253U1 (en) * | 1979-09-26 | 1981-03-26 | Robert Bosch Gmbh, 70469 Stuttgart | HEAT EXCHANGER, ESPECIALLY FOR GAS OR OIL HEATED WATER HEATERS |
| NL8602966A (en) * | 1986-01-20 | 1987-08-17 | Burnham Europa Bv | BOILER WITH DHW SUPPLY AND A HEAT EXCHANGER FOR SUCH A BOILER. |
| ES2066582T3 (en) * | 1991-09-19 | 1995-03-01 | Leblanc Sa E L M | MIXED WATER HEATER EXCHANGER, WITH SANITARY HEATING COIL WITHOUT WELDING. |
| FR2681670B1 (en) * | 1991-09-19 | 1993-12-03 | Elm Leblanc | MIXED HEATER-HOT WATER EXCHANGER WITH NON-WELDED SANITARY HEATING COIL. |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1422247A (en) * | 1964-11-09 | 1965-12-24 | Chaffoteaux Et Maury | Improvements to heating elements |
| DE2115532B2 (en) * | 1971-03-31 | 1973-03-01 | Joh Vaillant KG, 5630 Remscheid | LAMELLA RADIATOR |
-
1977
- 1977-09-23 DE DE2742820A patent/DE2742820C2/en not_active Expired
-
1978
- 1978-05-25 GB GB22727/78A patent/GB1596616A/en not_active Expired
- 1978-08-28 FR FR7824832A patent/FR2404178A1/en active Granted
- 1978-09-19 IT IT27807/78A patent/IT1110156B/en active
- 1978-09-20 AT AT0679078A patent/AT376491B/en not_active IP Right Cessation
- 1978-09-22 ES ES473604A patent/ES473604A1/en not_active Expired
- 1978-09-22 NL NLAANVRAGE7809671,A patent/NL186031C/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002050478A1 (en) * | 2000-12-20 | 2002-06-27 | Merloni Termosanitari S.P.A. | Bi-thermal heat exchanger in particular for condensing boilers |
Also Published As
| Publication number | Publication date |
|---|---|
| NL186031B (en) | 1990-04-02 |
| DE2742820A1 (en) | 1979-04-05 |
| IT1110156B (en) | 1985-12-23 |
| ES473604A1 (en) | 1979-04-01 |
| FR2404178A1 (en) | 1979-04-20 |
| ATA679078A (en) | 1983-03-15 |
| NL7809671A (en) | 1979-03-27 |
| DE2742820C2 (en) | 1985-09-12 |
| IT7827807A0 (en) | 1978-09-19 |
| NL186031C (en) | 1990-09-03 |
| FR2404178B1 (en) | 1983-09-09 |
| AT376491B (en) | 1984-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930525 |