WO2006065121A1 - Procede pour monter un vase d'expansion dans un circuit liquide ferme et circuit liquide ferme avec vase d'expansion - Google Patents

Procede pour monter un vase d'expansion dans un circuit liquide ferme et circuit liquide ferme avec vase d'expansion Download PDF

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Publication number
WO2006065121A1
WO2006065121A1 PCT/NL2005/000864 NL2005000864W WO2006065121A1 WO 2006065121 A1 WO2006065121 A1 WO 2006065121A1 NL 2005000864 W NL2005000864 W NL 2005000864W WO 2006065121 A1 WO2006065121 A1 WO 2006065121A1
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WO
WIPO (PCT)
Prior art keywords
expansion tank
closed
space
open
liquid circuit
Prior art date
Application number
PCT/NL2005/000864
Other languages
English (en)
Inventor
Franciscus Roffelsen
Original Assignee
Spiro Research B.V.
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 Spiro Research B.V. filed Critical Spiro Research B.V.
Publication of WO2006065121A1 publication Critical patent/WO2006065121A1/fr

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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
    • 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
    • F24D3/1083—Filling valves or arrangements for filling

Definitions

  • the invention relates to a method for mounting an expansion tank in a closed liquid circuit with varying temperature, which expansion tank is provided with a housing divided by a membrane into a closed-off space and a space which is brought, via a connection, into open communication with a pipe of the closed liquid circuit, and to a closed liquid circuit with an expansion tank mounted therein.
  • a closed liquid circuit such as a pipe network for heating a building
  • the circulated liquid will expand upon heating and, consequently, increase the pressure in the circuit.
  • an excess pressure release valve is present.
  • the pressure increases very rapidly.
  • an expansion tank which is provided with a housing divided by a membrane into, on the one side, a closed- off space, in which a gas is present, and, on the other side, a space which is brought, via a connection, into open communication with a pipe of the closed liquid circuit.
  • the membrane Upon expansion of the liquid, the membrane, while compressing the gas in the closed-off space, is pressed back by the expanding liquid and thus prevents the rapid and sharp increase of the pressure in the closed liquid circuit through volume increase thereof.
  • the gas pressure in the closed-off space When the liquid cools down, the gas pressure in the closed-off space will gain the upper hand and press the membrane back and, optionally, bend it towards the other side.
  • Such an expansion tank also provides an amount, albeit a limited amount, of liquid for replacing liquid exiting the circuit through, for instance, sweating, that is to say, leaking in a scarcely perceptible manner.
  • the object of the invention is to eliminate the above-mentioned problems, that is to say, to ensure that the risk of an expansion tank breaking down as well as the risk of unnecessary, that is, premature replacement of an expansion tank still functioning well is reduced to a minimum while maintaining the optimal functioning of the expansion tank in all its aspects.
  • expansion tanks are known where the connection is drawn at the bottom side, but where it is not stated whether the expansion tanks should be mounted in a "standing” position instead of, as is common practice, in a “suspended” manner.
  • a prejudice prevailing in practice against mounting in "standing” position is that in that position, the expansion tank “captures” gases present in the circulating liquid, which gases can thereupon no longer be removed from the expansion tank, so that during the compensating operation of the nearly exhausted expansion tank, gases can be pressed back into the system in an undesired manner.
  • the expansion tank when liquid leaks from the closed circuit, the expansion tank also has a compensatory function in order to prevent the installation from breaking down as a result of too low a pressure due to lack of liquid.
  • gases separated from the liquid may accumulate under the membrane, which can also be considered to be disadvantageous to the compensatory function because of the unnoted decrease of the amount of compensating liquid available.
  • the closed liquid circuit is provided with an automatically operative make-up device for liquid.
  • this layer of air also entails an increase of the compensating volume, so that either with a similar expansion tank a greater compensation is possible, or the same compensation can be realised with a smaller and less expensive expansion tank, while it is ensured that no gases can be pressed back into the system and sufficient liquid is always present to ensure continuous and undisturbed functioning.
  • the invention also relates to a closed liquid circuit with varying temperature and provided with an expansion tank, provided with a housing divided by a membrane into an upper, closed-off space and a lower space which, via a connection, is in open communication with a pipe of the closed liquid circuit.
  • the lower space is in open communication with an de-aeration device which, in turn, is in open communication with a pipe situated therebeneath of a closed liquid circuit, the de-aeration device being provided with an enclosed space in which a float is present which, by descending within the enclosed space, can open a de- aeration valve.
  • a make-up device comprising an enclosed space in which a float is present which, by descending within the enclosed space, can open a make-up valve.
  • the float which can open the de-aeration valve is also the float that can open the make-up valve while, upon descending, the float will first open the de-aeration valve and, when descending further, it will open the make-up valve.
  • Fig. 1 schematically shows a closed liquid circuit in the form of a central heating installation
  • Fig. 2 shows, in enlarged scale, in cross-section, a possible connection between the expansion tank and liquid circuit.
  • the closed liquid circuit schematically represented in Fig. 1 in the form of a central heating installation, is provided with a boiler 1, pipes 2 and radiators 3.
  • a pump 4 is present for circulating the liquid, and an expansion tank 5 for compensating for the difference in volume of the circulated liquid upon heating and cooling down.
  • a combined, float-controlled make-up/de-aeration device 6 is present.
  • the intended device 6 is provided with a housing 7, which is substantially cylindrical, a lower front end thereof being in open communication with a tube part 8, and thus communicating with one of the pipes 2, while an upper front end is in open communication with a tube part 16 and hence, communicates with the expansion tank 5, which is provided with a spherical housing 12 with an internal space divided in two by a membrane 13, thereby forming a completely closed-off space 14 and a space 15 which, via the tube part 16, is in open communication with the make-up/de-aeration device 6.
  • a float 17 (Fig. 2) is present which descends in the housing 7 when the size of the air head increases through capture of gases from the circulating liquid and/or cooling down of this liquid.
  • the float 17 When descending, the float 17 will open a de- aeration valve 9 at a first level, whereupon gases from the air head will be blown-off when the pressure in the air head is higher than a blow-off pressure set by a non-return valve 18 forming part of the de-aeration valve 9. If the float 17 descends further, this will result in the make-up valve 10 being opened so that fresh liquid is brought from a pipe 11 communicating with a source, via the make-up valve 10, the open connection and the tube part 8 into the liquid circuit.
  • the rising of the float 17 due to adding and/or heating up of the liquid and/or blowing-off of gases from the air head results in the closure of, first, the make-up valve 10 and, upon further rising of the float 17, closure of the de-aeration valve 9, whereupon the closed liquid circuit can make use of the complete capacity of the expansion tank 5 for keeping the pressure in this closed liquid circuit within the desired values.
  • the fact is that making-up with fresh liquid will only take place after all liquid has been pressed away from the expansion tank 5.
  • the make-up function of the expansion tank 5 has in fact become superfluous, which means that it is sufficient to provide an expansion tank which is smaller, and therefore less expensive, than an expansion tank used in a situation in which a part, for instance half, of the volume of the expansion tank must be available for make-up purposes.
  • the expansion tank is mounted in "standing" position, that is to say that the space 15 is situated below the completely closed-off space 14 and the tube part 16 terminates in a lower area of the expansion tank 5.
  • Fig. 2 the situation is represented in which the liquid has been entirely or virtually entirely pressed from of the expansion tank.
  • the compensatory operation of the expansion tank is based on the bending of the membrane from an initially horizontal, neutral position, in which the expansion tank is half filled with liquid and half filled with gas under pressure, to a position in which, under the influence of the expansion of heated liquid, more liquid is pressed from the pipes into the expansion tank and the gases are compressed, or to a position in which, as a result of liquid cooling down and/or liquid leaked away, virtually all liquid has been pressed out of the expansion tank, which latter position is shown in Fig. 2 and in which position, subsequently, the make-up device will enter into operation for adding liquid to the closed circuit.
  • the membrane 13 will frequently move to and fro and then hinge about the attachment to the housing 12.
  • the membrane bends upwards and outwards as a result of liquid cooling down or leaking away, the lowest point of the membrane is the annular attachment to the housing.
  • Hard and/or sharp particles present in the expansion tank will descend to this area and may become wedged between the housing and the membrane, so that the membrane may be perforated which results in the expansion tank becoming inoperative.
  • the referred-to hard and/or sharp particles will not end up in the expansion tank, let alone in the hinge area situated, then, in the highest point, resulting in quite a considerable lengthening of the life span of the expansion tank.
  • the expansion tank can also be placed next to the pipe to which is it connected, while the connection of the open communication between the pipe and the expansion tank must be maintained on the lower part thereof in order to prevent hard and/or sharp particles from contacting the membrane.
  • an expansion tank can have any other suitable design than the spherical form shown in the drawing. If desired, the installation can also be provided with other make-up and/or de-aeration devices.

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)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

La présente invention concerne un procédé pour monter un vase d'expansion dans un circuit liquide fermé aux températures variables, lequel vase d'expansion est muni d'un logement divisé par une membrane en un espace confiné et un espace qui, par l'intermédiaire d'une connexion ouverte, est mis en communication avec un tuyau du circuit liquide fermé, le vase d'expansion étant en outre monté de telle sorte que la connexion est située dans une zone inférieure du vase d'expansion, l'agencement étant tel que l'espace confiné est situé sensiblement au-dessus de l'espace en communication ouverte avec le tuyau, alors qu'entre la connexion au vase d'expansion et la connexion ouverte au tuyau, un dispositif à actionnement automatique de désaération est monté. De préférence, le dispositif de désaération est combiné à un dispositif de compensation.
PCT/NL2005/000864 2004-12-15 2005-12-15 Procede pour monter un vase d'expansion dans un circuit liquide ferme et circuit liquide ferme avec vase d'expansion WO2006065121A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1027791A NL1027791C2 (nl) 2004-12-15 2004-12-15 Werkwijze voor het in een gesloten vloeistofcircuit monteren van een expansievat alsmede gesloten vloeistofcircuit en expansievat.
NL1027791 2004-12-15

Publications (1)

Publication Number Publication Date
WO2006065121A1 true WO2006065121A1 (fr) 2006-06-22

Family

ID=34974934

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2005/000864 WO2006065121A1 (fr) 2004-12-15 2005-12-15 Procede pour monter un vase d'expansion dans un circuit liquide ferme et circuit liquide ferme avec vase d'expansion

Country Status (2)

Country Link
NL (1) NL1027791C2 (fr)
WO (1) WO2006065121A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113978887A (zh) * 2021-09-09 2022-01-28 岳少鹏 一种自适应温度的防挥发化工品存储桶

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899514A2 (fr) * 1997-08-26 1999-03-03 OTTO HEAT Heizungs-, Energie- und Anlagentechnik GmbH & Co., KG Vase d'expansion empilable
GB2335029A (en) * 1998-03-07 1999-09-08 Baxi Heating Ltd A combined expansion and thermal storage vessel
DE10001542A1 (de) * 2000-01-14 2001-08-02 Reflex Winkelmann & Pannhoff G Membranausdehnungsgefäß
US6526921B1 (en) * 1998-09-30 2003-03-04 Spiro Research B.V. Method for operating a closed hot-water installation and apparatus to be used therewith

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899514A2 (fr) * 1997-08-26 1999-03-03 OTTO HEAT Heizungs-, Energie- und Anlagentechnik GmbH & Co., KG Vase d'expansion empilable
GB2335029A (en) * 1998-03-07 1999-09-08 Baxi Heating Ltd A combined expansion and thermal storage vessel
US6526921B1 (en) * 1998-09-30 2003-03-04 Spiro Research B.V. Method for operating a closed hot-water installation and apparatus to be used therewith
DE10001542A1 (de) * 2000-01-14 2001-08-02 Reflex Winkelmann & Pannhoff G Membranausdehnungsgefäß

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113978887A (zh) * 2021-09-09 2022-01-28 岳少鹏 一种自适应温度的防挥发化工品存储桶

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Publication number Publication date
NL1027791C2 (nl) 2006-06-22

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