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EP0580881B1 - Dispositif pour dégazer des liquides dans des systèmes à circuit de liquides - Google Patents

Dispositif pour dégazer des liquides dans des systèmes à circuit de liquides Download PDF

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Publication number
EP0580881B1
EP0580881B1 EP19920112366 EP92112366A EP0580881B1 EP 0580881 B1 EP0580881 B1 EP 0580881B1 EP 19920112366 EP19920112366 EP 19920112366 EP 92112366 A EP92112366 A EP 92112366A EP 0580881 B1 EP0580881 B1 EP 0580881B1
Authority
EP
European Patent Office
Prior art keywords
pressure
vessel
degassing
liquid
pressure vessel
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 - Lifetime
Application number
EP19920112366
Other languages
German (de)
English (en)
Other versions
EP0580881A1 (fr
Inventor
Roman Schreter
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.)
A Schwarz and Co
Original Assignee
A Schwarz and Co
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 A Schwarz and Co filed Critical A Schwarz and Co
Priority to DE59200229T priority Critical patent/DE59200229D1/de
Publication of EP0580881A1 publication Critical patent/EP0580881A1/fr
Application granted granted Critical
Publication of EP0580881B1 publication Critical patent/EP0580881B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F24D19/00—Details
    • F24D19/08—Arrangements for drainage, venting or aerating
    • F24D19/082—Arrangements for drainage, venting or aerating for water heating systems
    • F24D19/083—Venting arrangements

Definitions

  • the invention relates to a device for degassing liquids in liquid circulation systems, especially in heating or cooling systems, with a closed pressure vessel, which can be temporarily connected via lines with valves to lines of a liquid circuit so that at least a part of the liquid flow the pressure vessel flows through, which is temporarily connected to the atmosphere via a controllable valve, preferably via an expansion tank connected to the atmosphere, which can be connected to the closed pressure vessel via the controllable valve, as well as a pressure pump, in order to pressureless liquid into the liquid circuit to promote and a control unit for controlling the valves and the pressure pump, with degassing at intervals by closing the valves between the pressure vessel and the liquid circulation system and the valve between the pressure vessel ter and the atmosphere, preferably between the pressure vessel and the expansion tank is opened, with a pressure loss in the liquid circulation system being compensated for by the pressure pump after the degassing process.
  • heating or cooling of the heating fluid causes a change in volume.
  • the additional volume must be removed from the liquid circuit during heating and returned to the liquid circuit when cooling.
  • it is known to transfer the excess heating fluid caused by the thermal expansion into an open expansion vessel and to supply heating fluid to the liquid circuit again when it cools down.
  • Closed expansion tanks are also known for this purpose. Doing so Usually, when a certain overpressure in the liquid circuit is reached, a solenoid valve is opened and the heating liquid is released from the liquid circuit into the expansion tank. If the pressure in the system drops, the pressure pump is switched on and heating fluid is pumped from the expansion tank into the fluid circuit.
  • liquid in such liquid circulation systems is gaseous (the term gas includes air in this context).
  • gas includes air in this context.
  • the amount of gas in the liquid reduces heat transfer and at the same time promotes the corrosion of the system. Efforts are therefore made to degas the liquid in such systems.
  • EP-B1-0 187 683 and EP-B1-0 292 814 describe degassing devices of the type mentioned at the outset, the pressure vessels being able to be connected via valves on the one hand to the liquid circulation systems and on the other hand to the expansion vessels connected to the atmosphere. Part of the liquid of the liquid circulation system circulates through the pressure vessel during normal operation of the system. The valves are changed over at certain intervals, which are stored in the control unit, so that the pressure vessels are brought into connection with the expansion vessels connected to the atmosphere. Since the pressure in the pressure vessels, which was previously equal to the system pressure, drops to atmospheric pressure, the liquid in the pressure vessel releases gas.
  • valves are switched over and the pressure vessels are again connected to the liquid circuit into which the water which has just been degassed is returned.
  • the resulting pressure loss in the liquid circulation system becomes compensated for in that water is pumped from the expansion tank, which is connected to the atmosphere, into the pressure vessel by means of the pressure pump.
  • the system pressure is measured by a sensor in the line that leads from the pressure vessel to the liquid circulation system.
  • the object of the invention is to improve a device of the type mentioned in such a way that the degassing processes are adapted to the effective gas content in the liquid circulation system.
  • control unit determines the duration of the intervals between the degassing processes determined as a function of pressure loss in the liquid circulation system during the degassing processes.
  • control unit determines the duration of the intervals depending on the running time of the pressure pump after a degassing process.
  • the running time that the pressure pump needs to increase the system pressure that has dropped after the degassing process to a predetermined value is a good indicator of the gas content in the liquid. If the pump runs for a long time, there is a lot of gas, if the running time of the pump decreases, this means that the gas content in the liquid has decreased.
  • Another embodiment provides that a throttle is provided in the flow direction after the pressure pump and that a throttle is arranged in the line leading from the pressure vessel into the expansion tank, which is located upstream of the valve.
  • the throttle valves make the system run more smoothly.
  • the figure of the drawing shows a diagram of a device according to the invention.
  • the device according to the invention is connected to a liquid circulation system 3 via an inlet line 1 and a return line 2. It has a pressure vessel 4, the term pressure vessel being understood to mean that, during normal operation of the system, this vessel has the same pressure as prevails in the liquid circulation system 3.
  • the pressure vessel 4 is connected via a valve 5 to an expansion tank 6, which is connected to the atmosphere.
  • a throttle valve 7 is located in front of the valve 5.
  • the expansion tank 6 is connected to the fresh water line 9 via a solenoid valve 8. In the expansion tank 6 there are sensors 10 which indicate the lowest and highest water levels.
  • Another line 11 connects the pressure vessel 4 to the expansion tank 6, a pressure pump 12 being provided in this line 11. Furthermore, there is a check valve 13 in line 11, which prevents the backflow and a throttle valve 14, which serves to stabilize the pressure.
  • a check valve 15 is also provided in the discharge line 2.
  • a line 16 connects the return line 2 to the expansion tank 6 and an overflow valve 17 is arranged in this line 16.
  • a sensor 18 is located in the return line 2, which measures the system pressure.
  • a pump 19, which works as a circulation pump, a solenoid valve 20 and a filter 21 are also located in the feed line 1.
  • shut-off valves 22 which, however, are open during the entire operation of the system and have no function during the operation of the system.
  • the pressure pump 12, the pump 19 and the valves 20, 5 and 8 are controlled by a control unit 23, for example a microprocessor.
  • Drain valves 24 for the pressure vessel 4 and the expansion tank 6 are also shown in the drawing. Further parts of the device, which belong to the known prior art and have no connection with the invention, are not shown.
  • the solenoid valve 20 is closed by the control unit 23 and the pump 19 is switched off.
  • the check valve 15 closes automatically under spring action.
  • the control unit 23 opens the solenoid valve 5. Since the pressure vessel 4, which had hitherto been at the system pressure, is thereby connected to the expansion tank 6, which has atmospheric pressure, degassing occurs. After the degassing time specified by the control unit 23, for example 20 seconds, the solenoid valve 5 is closed again. It there is a pause of 1 second. If the pressure in the liquid circulation system 3, which is measured by the sensor 18, has dropped below a predetermined value, for example 0.2 bar below the optimal system pressure, the pressure pump 12 is activated, the water from the expansion tank 6 into the return line 2 and thus into the Liquid circulation system 3 pumps.
  • a predetermined value for example 0.2 bar below the optimal system pressure
  • control unit 23 receives the information from the sensor 18 that the desired system pressure has been reached, the pressure pump 12 is switched off. The solenoid valve 20 is then opened again and the pump 19 is activated, so that the water which has just been degassed is pumped out of the pressure vessel 4 into the liquid circulation system and the pressure vessel 4 is flushed again by the water of the liquid circulation system 3.
  • the control unit 23 calculates the duration of the interval until the next degassing process, i. H. until the solenoid valve 20 closes and the solenoid valve 5 opens. If the pressure pump 12 had to run for a very long time, this means that there is a lot of gas in the heat transfer fluid and the next degassing process will take place relatively soon. If the pressure pump 12 has only been running for a very short time, this means that the system has been completely or largely degassed and thus it can take a long time until the next degassing process.

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  • 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)
  • Degasification And Air Bubble Elimination (AREA)
  • Physical Water Treatments (AREA)

Claims (6)

  1. Dispositif pour dégazer des liquides dans des systèmes à circuit de liquide, notamment dans des installations de chauffage ou de refroidissement, comportant un récipient sous pression fermé (4) qui est apte être relié temporairement à des conduites d'un circuit de liquide (3) par l'intermédiaire de conduites (1, 2) pourvues de soupapes (15, 20), de telle sorte qu'une partie au moins du courant de liquide traverse le récipient sous pression (4), qui est relié temporairement à l'atmosphère par l'intermédiaire d'une soupape apte à être commandée (5), de préférence par l'intermédiaire d'un récipient de compensation (6) qui est relié à l'atmosphère et est apte à être relié au récipient sous pression fermé (4) par l'intermédiaire de la soupape apte à être commandée (5), comportant aussi une pompe refoulante (12) pour amener du liquide sans pression dans le circuit de liquide (3), et un dispositif de commande (23) pour commander les soupapes (5, 20) et la pompe refoulante (12), étant précisé que l'on procède par intervalles à un dégazage en fermant les soupapes (15, 20) entre le récipient sous pression (4) et le système à circuit de liquide (3) et en ouvrant la soupape (5) entre le récipient sous pression (4) et l'atmosphère, de préférence entre le récipient sous pression (4) et le récipient de compensation (6), et qu'après le dégazage, une perte de pression dans le système à circuit de liquide (3) est compensée par la pompe refoulante (12), caractérisé en ce que l'unité de commande (23) définit la durée de l'intervalle entre les opérations de dégazage en fonction de la perte de pression dans le système à circuit de liquide (3) pendant lesdites opérations de dégazage.
  2. Dispositif selon la revendication 1, caractérisé en ce que l'unité de commande (23) définit la durée des intervalles en fonction de la durée de marche de la pompe refoulante (12) après une opération de dégazage.
  3. Dispositif selon la revendication 2, caractérisé en ce qu'il est prévu, après la pompe refoulante (12) dans le sens d'écoulement, un organe d'étranglement (13).
  4. Dispositif selon la revendication 2, caractérisé en ce qu'il est prévu, dans la conduite qui va du récipient sous pression (4) au récipient de compensation (6), un organe d'étranglement (7) qui se trouve avant la soupape (5) dans le sens d'écoulement.
  5. Dispositif selon la revendication 1, caractérisé en ce que, d'une manière connue en soi, il est prévu, de préférence dans une conduite qui relie le récipient sous pression (4) aux conduites du système à circuit de liquide (3), un manomètre (18) qui est raccordé à l'unité de commande (23).
  6. Dispositif selon la revendication 2, caractérisé en ce que la pompe refoulante (12) est activée par l'unité de commande (23) lorsque la pression devient inférieure d'au moins 0,2 bar à la pression d'installation optimale du système à circuit de liquide (3).
EP19920112366 1991-04-24 1992-07-20 Dispositif pour dégazer des liquides dans des systèmes à circuit de liquides Expired - Lifetime EP0580881B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE59200229T DE59200229D1 (de) 1992-07-20 1992-07-20 Vorrichtung zur Entgasung von Flüssigkeiten in Flüssigkeitskreislaufsystemen.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT85191A AT396521B (de) 1991-04-24 1991-04-24 Vorrichtung zur entgasung von flüssigkeiten in flüssigkeitskreislaufsystemen

Publications (2)

Publication Number Publication Date
EP0580881A1 EP0580881A1 (fr) 1994-02-02
EP0580881B1 true EP0580881B1 (fr) 1994-06-08

Family

ID=3501253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920112366 Expired - Lifetime EP0580881B1 (fr) 1991-04-24 1992-07-20 Dispositif pour dégazer des liquides dans des systèmes à circuit de liquides

Country Status (2)

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EP (1) EP0580881B1 (fr)
AT (1) AT396521B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401293B (de) * 1994-01-14 1996-07-25 Schwarz A & Co Verfahren und vorrichtung zur entgasung der flüssigkeit in einem flüssigkeitskreislauf
AT408585B (de) * 1997-12-16 2002-01-25 Schwarz A & Co Verfahren zur steuerung einer vorrichtung zur druckhaltung und entgasung einer in einem flüssigkeitskreislaufsystem, insbesondere einer heizungsanlage, zirkulierenden flüssigkeit
CZ293695B6 (cs) 1997-11-26 2004-07-14 A. Schwarz + Co. Způsob odplyňování a zařízení k provádění způsobu
BE1023923B1 (nl) * 2016-02-25 2017-09-19 Sercal Belgium Bvba Werkwijze en detector voor het detecteren van luchtbellen of luchtinsluitingen in een systeem, evenals installatie die zulke detector bevat
NL2025076B1 (en) * 2019-09-03 2021-04-13 Flamco Bv Liquid replenishing system and method of replenishing
WO2021045620A1 (fr) * 2019-09-03 2021-03-11 Flamco B.V. Système de remplissage de liquide et procédé de remplissage associé
AT524772B1 (de) 2021-05-21 2022-09-15 Olymp Werk Gmbh Zusatzvorrichtung für Temperiersystem und Temperiersystem mit Desinfektionseinheit
WO2023203029A1 (fr) * 2022-04-20 2023-10-26 Grundfos Holding A/S Procédé et système de dégazage de liquide

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3237023A1 (de) * 1982-10-06 1984-04-12 H.F. 8036 Herrsching Bernstein Entgasungsvorrichtung fuer fluessigkeitsstroeme
DE3716396A1 (de) * 1987-05-15 1988-12-15 Hans Friedrich Bernstein Ausdehnungs- und druckhaltevorrichtung fuer zirkulierende fluessigkeitsstroeme
GB8721090D0 (en) * 1987-09-08 1987-10-14 Pressure Units Ltd Central heating system

Also Published As

Publication number Publication date
AT396521B (de) 1993-10-25
EP0580881A1 (fr) 1994-02-02
ATA85191A (de) 1993-01-15

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