EP0631094A1 - Kessel - Google Patents

Kessel Download PDF

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Publication number
EP0631094A1
EP0631094A1 EP94304510A EP94304510A EP0631094A1 EP 0631094 A1 EP0631094 A1 EP 0631094A1 EP 94304510 A EP94304510 A EP 94304510A EP 94304510 A EP94304510 A EP 94304510A EP 0631094 A1 EP0631094 A1 EP 0631094A1
Authority
EP
European Patent Office
Prior art keywords
water
expansion vessel
port
heat exchanger
boiler
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.)
Withdrawn
Application number
EP94304510A
Other languages
English (en)
French (fr)
Inventor
Michael Andrew Bainbridge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CARADON HEATING Ltd
Original Assignee
CARADON HEATING Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CARADON HEATING Ltd filed Critical CARADON HEATING Ltd
Publication of EP0631094A1 publication Critical patent/EP0631094A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks
    • F24D3/1016—Tanks having a bladder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1008—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system expansion tanks
    • 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
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • 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
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/148—Arrangements of boiler components on a frame or within a casing to build the fluid heater, e.g. boiler

Definitions

  • This invention relates to boilers of the kind having an expansion vessel and suitable for sealed, i.e. non open vented, water systems.
  • the invention is concerned with expansion vessels, especially but not necessarily exclusively, suitable for use in the type of boiler unit known as a "combination boiler unit" and capable of providing hot water both for central heating and for consumption without need for hot water to be stored to be ready on demand.
  • Expansion vessels are required in sealed hot water central heating systems to accommodate expansion of the water in the system from cold to hot without generating an excessive increase in water pressure in the system.
  • Expansion vessels generally consist of a container, usually steel, of adequate strength to resist the maximum pressure in the system.
  • a rubber diaphragm fixed to the periphery of the container such that it divides the volume of the container into two sections, namely a water chamber and a gas chamber.
  • the diaphragm is free to move such that either of the sections can occupy all or none of the total volume of the vessel depending upon relative pressures within the sections.
  • One section i.e. the water chamber, has an inlet/outlet aperture for connection to the heating system whilst the other section is pressured with nitrogen, usually to a pressure of about 1 bar, thus biasing the diaphragm towards the water connection to reduce the volume of the water chamber when the system is cold.
  • the expansion volume of water passes through the connection into the vessel, forcing the diaphragm back and compressing the nitrogen in the gas chamber of the vessel.
  • combination boilers The heat output of combination boilers is often relatively high in order to ensure the required hot water performance, and the expansion vessels used in these boilers are relatively large, e.g. around 8 litres capacity. As a consequence, the expansion vessel occupies a substantial portion of the total space within the boiler casing whilst serving a relatively simple function. Due to a general desire for combination boilers to be of compact design, the necessary pipework between the components of the boiler is often extensively manipulated, leading to difficulties of access to the components and their servicing.
  • the present invention addresses the foregoing drawbacks and provides an expansion vessel in or for a boiler unit having a heat exchanger for heating water to be circulated through a closed flow circuit, the expansion vessel comprising a container divided internally by movable wall means to form gas and water chambers, and a port for connecting the water chamber to the flow circuit, characterized in that a further port opens into the water chamber for connecting the water chamber to the flow circuit, one port being an inlet port and the other port being an outlet port so that water circulating through the flow circuit passes through the water chamber.
  • the water chamber of the expansion vessel having at least two connections it is adapted for communication with respective boiler components between which water flows during normal operation of the boiler, whereby the expansion vessel acts as a manifold to conduct flow of water between said components.
  • the expansion vessel acts as a manifold to conduct flow of water between said components.
  • the invention in a most preferred form envisages an expansion vessel adapted for many of the other components in a combination boiler to be attached to or incorporated with the vessel, and in particular the part thereof enclosing the water chamber.
  • a gallery interconnecting the water inlet and outlet connections is defined by an internal partition structure arranged to prevent the diaphragm moving to a position in which it would obstruct or prevent flow through the gallery.
  • the gallery conveniently forms part of the water return flow path for both the central heating and hot water circuits of the boiler unit, although it could provide alternative connections without departing from the basic concept.
  • the wall of the container forms at least partially a pump housing for a water circulation pump which is mounted on the vessel and includes a suction or discharge port constituted by one of the inlet/outlet connections of the water chamber.
  • the expansion vessel according to the invention can serve several functions. As well as acting as a normal expansion vessel, it can form part of both the central heating and hot water flow circuits, allowing such of the conventional pipework connecting boiler components to be eliminated. Thereby a boiler of a more compact design and/or having improved accessibility for maintenance purposes can be obtained.
  • the invention also resides in a boiler incorporating the expansion vessel as described above.
  • a gas boiler unit having a main heat exchanger 1 arranged to be heated by a gas burner (not shown).
  • An outlet 12 from this heat exchanger is connected to the inlet of a diverter valve 4 having first outlet 13 connected to a pipe which will be connected to the upstream conduit of a central heating circuit, and a second outlet 14 connected by a short pipe to an inlet of a plate heat exchanger 2 through which water from the main heat exchanger is passed for heating water to be consumed in a domestic hot-water supply.
  • An expansion vessel 3 is mounted in the boiler casing alongside the main heat exchanger, below the diverter valve, and behind the plate heat exchanger.
  • the vessel 3 is divided internally into two sections or chambers 15,16 by a diaphragm 9, and is assembled from two container parts 3A,3B with confronting external flanges which are sealed to each other by the edge of the diaphragm and are clamped together by a peripheral band or collar 20 as shown in Figure 2A.
  • the rear chamber 15 is a gas chamber and contains nitrogen under pressure
  • the front chamber 16 is filled with water and connected to the water flow circuits in the boiler as described below.
  • the diaphragm 9 is moveable within the vessel 3 to vary the relative volumes of the chambers 15,16 depending on the pressures within these chambers.
  • a partition wall 10 Defined within the chamber 16 by a partition wall 10 is a gallery 6 extending the height and width of the front wall of the expansion vessel.
  • the partition wall consists of a plate, the edge of which is held by the diaphragm 9 and clamped between the container parts 3A,3B as best seen in Figure 2A.
  • the wall member 10 is spaced at a small distance from the front wall of the vessel so that the volume of the gallery takes up only a minor part of the internal volume of the vessel.
  • the wall member 10 is included to prevent the diaphragm 9 being deformed under the gas pressure to such an extent that it would obstruct flow of water through the gallery 6.
  • the plate 10 is perforated and as shown provided with a bleed orifice 11 to allow expanding water to reach and push back the diaphragm 9.
  • the expansion vessel has provided in the front part 3A of the container, which is formed as a casting, two inlets 7,8 opening into the gallery, and an integral pump housing 5 defining a pump chamber communicating with the gallery 6 through an outlet port 21 which is also the suction port of the pump.
  • the pump motor 22 is mounted directly on the front wall of the expansion vessel, the pump impeller 23 being received in the pump chamber for pumping water from the gallery 6 and out through a radial discharge port 24 leading from the pump housing.
  • the inlet 7 is connected by a short straight pipe to the outlet from the plate heat exchanger 2 for heating water having entered it from the main heat exchanger, and the inlet 8 is connected to the conduit at the downstream end of the central heating circuit.
  • return water having given up its heat in either the central heating circuit or in the plate heat exchanger for heating domestic hot water will be conducted into the gallery 6 through inlet 7 or inlet 8, and will be pumped out back to the main heat exchanger 1 via a pipe connecting the pump discharge port 24 to the inlet of this heat exchanger.
  • the pressure relief valve required to limit the maximum pressure within the system may be provided on the expansion vessel and be connected to the gallery 6 if desired.
  • water is heated within the main heat exchanger 1 by the gas burner and the hot water flows via outlet 12 to the diverter valve 4. If no domestic hot water is being demanded, the valve 4 is adjusted to direct the water to outlet 13 and hence to the central heating circuit.
  • the water passes through the central heating system and on return to the boiler unit is conducted through the inlet 8 into the expansion vessel 3.
  • the pump 22,23 pumps the water out of the gallery and back to the main heat exchanger to be reheated, and maintains the water flow through the circuit as described.
  • valve 4 is actuated to divert the heated water flowing from the main heat exchanger to outlet 14 and hence to plate heat exchanger 2 for heating the domestic water flowing through the second side of the heat exchanger to provide hot running water. Having given up its heat, the boiler water exits the exchanger 2 and flows to the gallery 6 in the expansion vessel via inlet 7. The water is then pumped back to the main heat exchanger by pump 22,23 to be reheated.
  • the expansion vessel 3 thus acts as part of the flow path as well as performing its usual function of accommodating expansion of the water due to heating, which is obtained in conventional manner due to the diaphragm 6. This saves space, allowing the boiler unit to be more compact and simplifies the arrangement of pipework within the boiler casing thereby facilitating servicing and maintenance.

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)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP94304510A 1993-06-28 1994-06-21 Kessel Withdrawn EP0631094A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9313273 1993-06-28
GB9313273A GB9313273D0 (en) 1993-06-28 1993-06-28 Boilers

Publications (1)

Publication Number Publication Date
EP0631094A1 true EP0631094A1 (de) 1994-12-28

Family

ID=10737898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94304510A Withdrawn EP0631094A1 (de) 1993-06-28 1994-06-21 Kessel

Country Status (2)

Country Link
EP (1) EP0631094A1 (de)
GB (1) GB9313273D0 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2342429A (en) * 1998-09-23 2000-04-12 George Curtis Flow control for boiler of central heating/hot water system
WO2006070282A2 (en) * 2004-12-28 2006-07-06 Renato Vaiani Integrated hydraulic unit
GB2555425A (en) * 2016-10-26 2018-05-02 Vexo International Uk Ltd Expansion vessel for a heating or cooling system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1346034A (fr) * 1959-04-11 1963-12-13 Chauffage central à eau chaude avec chauffe-eau à gaz
CH520900A (de) * 1971-07-26 1972-03-31 Atrol Armaturen Ges Mit Beschr Vorrichtung zum Entlüften und Volumenausgleich des Heizwassers in geschlossenen Warmwasserheizungsanlagen
DE8529850U1 (de) * 1985-10-22 1986-01-02 Wamsler - Herd- und Ofen GmbH, 8000 München Druck-Ausdehnungsgefäß
FR2606127A1 (fr) * 1986-11-03 1988-05-06 Muller Cie Chassis pour chaudiere notamment murale pour le chauffage et l'eau sanitaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1346034A (fr) * 1959-04-11 1963-12-13 Chauffage central à eau chaude avec chauffe-eau à gaz
CH520900A (de) * 1971-07-26 1972-03-31 Atrol Armaturen Ges Mit Beschr Vorrichtung zum Entlüften und Volumenausgleich des Heizwassers in geschlossenen Warmwasserheizungsanlagen
DE8529850U1 (de) * 1985-10-22 1986-01-02 Wamsler - Herd- und Ofen GmbH, 8000 München Druck-Ausdehnungsgefäß
FR2606127A1 (fr) * 1986-11-03 1988-05-06 Muller Cie Chassis pour chaudiere notamment murale pour le chauffage et l'eau sanitaire

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2342429A (en) * 1998-09-23 2000-04-12 George Curtis Flow control for boiler of central heating/hot water system
WO2006070282A2 (en) * 2004-12-28 2006-07-06 Renato Vaiani Integrated hydraulic unit
WO2006070282A3 (en) * 2004-12-28 2006-10-19 Renato Vaiani Integrated hydraulic unit
GB2555425A (en) * 2016-10-26 2018-05-02 Vexo International Uk Ltd Expansion vessel for a heating or cooling system
WO2018078341A1 (en) * 2016-10-26 2018-05-03 Vexo International (Uk) Limited Expansion vessel for a heating or cooling system
GB2555425B (en) * 2016-10-26 2019-06-26 Vexo International Uk Ltd Expansion vessel for a heating or cooling system

Also Published As

Publication number Publication date
GB9313273D0 (en) 1993-08-11

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