EP0663570A1 - Commande pour dégazer le liquide dans un système de circuit de liquide - Google Patents

Commande pour dégazer le liquide dans un système de circuit de liquide Download PDF

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Publication number
EP0663570A1
EP0663570A1 EP94120933A EP94120933A EP0663570A1 EP 0663570 A1 EP0663570 A1 EP 0663570A1 EP 94120933 A EP94120933 A EP 94120933A EP 94120933 A EP94120933 A EP 94120933A EP 0663570 A1 EP0663570 A1 EP 0663570A1
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EP
European Patent Office
Prior art keywords
pressure
liquid
degassing
pressure pump
valves
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Withdrawn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
EP94120933A
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German (de)
English (en)
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
Publication of EP0663570A1 publication Critical patent/EP0663570A1/fr
Withdrawn legal-status Critical Current

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    • 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 controller for degassing the liquid in a liquid circulation system, in particular of heating systems with at least one liquid container which is at least temporarily in gas exchange with the atmosphere, to which a prechamber is preferably connected at a level below the liquid container, the liquid container or the prechamber is connected to the liquid circulation system via an inlet line and via a return line and an electronic control unit is provided which, through control lines, has at least one pressure sensor registering the system pressure in the liquid circuit, furthermore at least one electrically controllable valve in the inlet line and with the drive of a pressure pump is connected in the return line.
  • degassing takes place, for example, at time-dependent intervals (cf.EP-B1-0 187 683), the electronic control unit, according to a known further development, the duration of the intervals between two degassing processes in Dependence on the pressure loss in the liquid circulation system during the degassing process is determined (see AT-B 396 521).
  • Another known proposal provides for the liquid to be degassed to be supplied to the unpressurized liquid container or its prechamber via an overflow valve in the supply line and to bring the degassed liquid back to system pressure with the aid of the pressure pump in the return line and to return it to the liquid circulation system, whereby degassing can be permanent or cyclical (cf. EP-A1-0 543 285).
  • the object of the invention is to improve the efficiency of the degassing, and preferably without having to use technical equipment that is problematic in terms of safety.
  • control comprises a pressure maintenance program which opens the controllable valve or the controllable valves in the supply line when the desired system pressure exceeds a certain level, or switches on the pressure pump arranged in the return line when the supply line is closed when the target system pressure falls below a certain level, the degassing being controlled such that at least in one phase of the degassing program the controllable valve or the controllable valves in the feed line are opened and the pressure pump in the return line is switched on as soon as in Sequence of the pressure maintenance program a running time of the pressure pump for restoring the target system pressure after a system pressure reduction is registered, which exceeds a certain dimension.
  • the degassing is therefore controlled to a certain extent according to the invention via the pressure maintenance program, which is known per se, and always starts when the amount of gas in the liquid of the liquid circulation system, for example a heating circuit, has reached a certain extent, because the running time that the pressure pump may have Constantly running pressure maintenance program needed to compensate for a reduction in pressure in the circulatory system is an indicator of the gas content in the liquid.
  • the pressure maintenance program which is known per se, and always starts when the amount of gas in the liquid of the liquid circulation system, for example a heating circuit, has reached a certain extent, because the running time that the pressure pump may have Constantly running pressure maintenance program needed to compensate for a reduction in pressure in the circulatory system is an indicator of the gas content in the liquid.
  • the degassing program i.e. the opening of the controllable valves in the feed line to the liquid container which is in gas exchange with the atmosphere or to its prechamber while the pressure pump in the return line is running, preferably begins at a system pressure which is a predetermined certain amount above the desired system pressure, while the degassing the system pressure drops, which should not, however, drop below the target system pressure to a certain extent.
  • the system pressure is then raised again with the supply line closed and the pressure pump running, whereupon the degassing process can be repeated cyclically.
  • the degassing program preferably ends after a predetermined number of degassing and pressure increase cycles, the number of cycles being able to be determined by empirical values.
  • a variant of this degassing program according to the invention is based on the prior art mentioned , according to which the flow through the controllable valve or valves in the feed line is temporarily opened at predetermined, selectable time intervals (intervals), the pressure pump possibly conveying liquid from the liquid container into the liquid circuit depending on the liquid level in the liquid container.
  • the relevant variant of the invention differs in that the pressure pump is switched on by the control unit at predetermined intervals at least approximately simultaneously with the opening of the flow and the controllable valve (s) and in that at least one of the controllable valves is closed and the pressure pump is switched off after a certain period of time specified by the control unit or, preferably within the time frame of the maximum opening period of the valves or running time of the pressure pump specified by the control unit, as a function of the liquid level in the liquid container.
  • Both variants have in common that in the degassing phase - at least over a certain period of time - both the controllable valves are open and the pressure pump is switched on at the same time. It is thus degassed to a certain extent in the flow, the "negative pressure" on the suction side of the pressure pump, e.g. in the preferably available pre-chamber for a particularly intensive degassing.
  • control can preferably be used by a user via the Control unit selectable additional program, through which the pressure pump in the return line is initially switched on by an additional control program which can be selected arbitrarily via the control unit, in particular for rough ventilation, by the pressure pump in the return line initially when the controllable valve or closed controllable valves are closed, until the pressure sensor switches it on monitored system pressure has risen to a certain extent above the desired system pressure, whereupon the flow through the controllable valve or the controllable valves in the feed line is opened as the pressure pump continues to run, after at least one of the controllable valves in the feed line after a period of time predetermined by the control unit closed again and the system pressure is raised to its setpoint using the pressure pump.
  • the electronic control unit preferably contains a microprocessor which has a microprocessor and which controls the various program sequences.
  • FIG. 1 shows the diagram of a hot water heating system suitable for carrying out the control according to the invention and
  • FIG. 2 shows a time-pressure diagram of the degassing program.
  • the liquid cycle is controlled by a Plant circulation pump 4 maintained or supported. Treated (eg softened and filtered) water is preferably used as the circulating liquid.
  • a liquid container 5 Connected to the liquid circuit is a liquid container 5 with a prechamber 6 lying below it at the level and open to the liquid container 5, e.g. in the form of a vertical tube, closed at the bottom.
  • the antechamber 6 is connected via an inlet line 7 and a return line 8 to the liquid circuit, in the illustrated case to the return line 2 '.
  • Inlet line 7 and return line 8 are connected at separate points to the line system of the liquid circuit (e.g. in the return line 2 ').
  • the inlet line 7 opens into the prechamber 6 at a distance above the return line 8.
  • the feed line 7 there are two electrically controllable solenoid valves 9, 10 in series and a pressure pump 11 in the return line 8. Furthermore, there are downstream in the feed line 7, there the solenoid valves 9, 10, and in the return line 8, there the pressure pump 11 , Flow restrictors 12 arranged. A dirt trap 13 can also be located in the feed line 7 and one or two check valves 14 are arranged in the return line 8. With the help of shut-off valves 15, preferably cap valves, which are open during operation, the feed line 7 and return line 8 can be shut off on the circuit side. An overflow valve 16 can be provided in parallel with the pressure pump 11 for safety reasons.
  • the liquid container 5 is constantly connected to the atmosphere via the overflow 17, the liquid container 5 is therefore "depressurized", i.e. the water in the container 5 is under atmospheric pressure. This essentially also applies to the prechamber 6.
  • the liquid container 5 is also designed with a fresh water supply, which is actuated by an electrically controllable solenoid valve 18.
  • a level sensor 19 in the liquid container 6. two level sensors or level switches, an upper and a lower one.
  • the following are connected to a central electronic control unit 20 via control lines: the solenoid valves 9, 10 and 18, the pressure pump 11 or its drive, the level sensor 19 and a pressure sensor 21 which, in the exemplary embodiment shown, flows upstream of the solenoid valves 9, 10 in the feed line 7 is located, but can be arranged anywhere where the system pressure (system pressure) of the liquid circuit (heating circuit) prevails.
  • the pressure sensor 21 connected to the control unit monitors the system pressure (system pressure) in the liquid circuit, one of the solenoid valves 9, 10, preferably both solenoid valves 9, 10, being closed and the pressure pump 11 being at rest. If the pressure sensor 21 detects that the system pressure is, for example, 0.4 bar too high (which can be the case, for example, when the heating system is heated up), then the flow through the solenoid valves 9, 10 is opened by the control, causing water gets out of the circuit into the liquid container 5 and raises the water level there. At the same time, the system pressure drops. In this case, the liquid container 5 serves as a compensation vessel for taking over the expansion. The solenoid valves 9, 10 remain open until the increased system pressure has dropped to the desired system pressure.
  • system pressure system pressure
  • the solenoid valves 9, 10 are closed via the control unit 20 and the drive of the pressure pump 11 is started. Water is now pumped from the liquid container 5 into the liquid circuit until the desired system pressure is reached again or slightly exceeded, for example by 0.2 bar.
  • the duration that the pressure pump 11 takes to compensate for a certain pressure difference depends, among other things, on the gas content in the liquid in the system. This effect is used to start the control program for the degassing, either by an optical or acoustic warning signal when the pump running time of the pressure pump 11 exceeds a certain amount in the pressure maintenance program, whereupon, for example, by pressing a pushbutton on the control unit it is possible to switch to the degassing program, or in that the degassing program is automatically started via the electronics of the control unit.
  • the degassing program then runs as follows:
  • the control unit 20 closes the solenoid valve 10 (the solenoid valve 9 can remain open) and the drive of the pressure pump 11 is switched on.
  • the closing of the solenoid valves 9, 10 and the switching on of the pressure pump 11 need not take place exactly at the same time. It is advantageous to switch on the pressure pump 11 with a slight delay in time.
  • the system pressure thereby rises in accordance with phase A 1 in FIG. 2 until the system pressure has reached a predetermined specific extent .DELTA.p + (eg +0.2 bar) above the desired system pressure p.sub .; then the solenoid valve 10 is opened, the solenoid valve 9 also remaining open and the pressure pump 11 continuing to run.
  • phase B1 in Fig. 2 The system pressure thereby decreases according to phase B1 in Fig. 2 to the extent ⁇ p- (eg -0.2 bar) below the target system pressure p0.
  • gas-laden liquid flows from the circulatory system via the feed line 7 into the "unpressurized" prechamber 6, which is at atmospheric pressure, where gas escapes from the liquid according to Henry's law and combines with the atmospheric air via the open liquid container 5.
  • Phase B 1 in the time-pressure diagram according to FIG. 2 is therefore the degassing phase.
  • At the pressure rise phase A1 and pressure reduction or degassing phase B1 can - for example given by the control unit - other phases, such as A2 with B2 (Fig. 2) etc. follow.
  • control system for example
  • the system pressure returns to the setpoint p0 via a pressure increase phase A n and a half pressure reduction phase C n .
  • the setpoint p0 can also be reached over a last half pressure rise phase from ⁇ p-.
  • control described can also run with only one of the two solenoid valves 9, 10.
  • Two solenoid valves connected in series improve the closing characteristics and offer double security.
  • the quantity restrictors 12 serve to avoid so-called control vibrations.
  • the feed line 7 and return line 8 could be fed directly into the liquid container 5, without the prechamber 6.
  • the pre-chamber 6 however, harmful air intake from the atmosphere can be avoided quite well and, at least during degassing, there is hardly any temperature exchange of the warm circulating liquid, which practically only flows through the pre-chamber 6, with the cooler standing container liquid.
  • control unit 20 With the described equipment, another control variant for the degassing of the system liquid can also be realized, and not via pressure maintenance, but via a time control and the monitoring of the liquid level in the liquid container 5.
  • the control unit 20 With the appropriate control program selection (e.g. by pressing a push button) the control unit 20) at predetermined, preferably selectable time intervals (intervals), which the control unit 20 specifies (for example in intervals of one or more minutes up to hourly or multi-hourly intervals), via the control unit the previously closed solenoid valves 9, 10 opened and, preferably shortly (for example a few seconds) afterwards, the pressure pump 11 automatically switched on.
  • the solenoid valves 9, 10 are both open and the pressure pump 11 is running.
  • this time control is combined with a control that reacts to the liquid level in the liquid container 5. If, for example, the pressure pump 11 feeds less liquid back into the circulatory system than it reaches the liquid container 5 through the solenoid valves 9, 10, the level in the liquid container rises. From a certain (selectable) upper level, the level sensor 19 reacts via the control unit 20 in such a way that the solenoid valves 9, 10 (or one of the two) have been closed prematurely, but the pressure pump 11 continues to run, until a certain (selectable) lower level the level sensor 19 together with the control unit 20 (or the time control) also causes the pressure pump 11 to be switched off.
  • the level sensor 19 can preferably be a piezoresistive sensor which reacts to the hydrostatic pressure of the liquid column in the liquid container 5. Such sensors give electrical signals e.g. in the milliampere range, the current intensity depending on the level of the liquid.
  • the signal evaluation can be set depending on the signal current strength of the sensor, with which the level sensor can be set to a specific (upper and lower) liquid level.
  • conventional level switches an upper and a lower one, can also be used.
  • the liquid circulation system (for example a hot water heating system) can have a pressure-maintaining device which is separate from the degassing and operates with a pressure sensor in the circulation system.
  • Rough ventilation for example when starting up a system with the described equipment, would be possible by using the control unit 20 with a corresponding program selection (for example by pressing a "coarse vent” pushbutton) initially with closed solenoid valves 9, 10 (a closed solenoid valve is sufficient) and running pressure pump 11 the system pressure monitored by the pressure sensor 21 to a certain extent ( ⁇ p +) above the target system pressure ( p0) is increased and then the flow through the solenoid valves 9, 10 is opened until the system pressure drops a certain amount ( ⁇ p-) below the desired system pressure (P0), the pressure pump 11 also running in this phase.
  • a program selection for example by pressing a "coarse vent” pushbutton
  • closed solenoid valves 9, 10 a closed solenoid valve is sufficient
  • running pressure pump 11 the system pressure monitored by the pressure sensor 21 to a certain extent ( ⁇ p +) above the target system pressure ( p0) is increased and then the flow through the solenoid valves 9, 10 is opened until the system pressure drops a
  • the liquid which is thus returned to the pre-chamber 6 via the inlet line 7 and from there back to the heating circuit system via the return line 8 is degassed in the "unpressurized" pre-chamber 6.
  • the control program for the rough ventilation ends with at least one of the solenoid valves 9, 10 in the inlet line 7 being closed after a period of time predetermined by the control unit 20 and the system pressure being raised to its setpoint value with the aid of the pressure pump 11.

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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)
EP94120933A 1994-01-14 1994-12-30 Commande pour dégazer le liquide dans un système de circuit de liquide Withdrawn EP0663570A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT6094A AT401293B (de) 1994-01-14 1994-01-14 Verfahren und vorrichtung zur entgasung der flüssigkeit in einem flüssigkeitskreislauf
AT60/94 1994-01-14

Publications (1)

Publication Number Publication Date
EP0663570A1 true EP0663570A1 (fr) 1995-07-19

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EP94120933A Withdrawn EP0663570A1 (fr) 1994-01-14 1994-12-30 Commande pour dégazer le liquide dans un système de circuit de liquide

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AT (1) AT401293B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29510126U1 (de) * 1995-06-22 1995-10-12 Bernstein, Hans Friedrich, 82211 Herrsching Armaturen, insbesondere für den Ausdehnungs- und Entspannungsbehälter eines Flüssigkeitskreislaufsystems
EP0924472A2 (fr) 1997-11-26 1999-06-23 A. Schwarz + Co. Méthode pour contrÔler un appareil pour dégazer et contrÔler la pression d'un liquide circulant dans un circuit, en particulier une installation de chauffage
EP0902239A3 (fr) * 1997-09-13 2001-04-25 Reflex Winkelmann + Pannhoff GmbH + Co. Dispositif de maintien de pression à commande par fluide
EP3211330A1 (fr) 2016-02-25 2017-08-30 Sercal Belgium BVBA Procédé et détecteur pour détecter des bulles d'air ou des poches d'air dans un système, ainsi qu'une installation qui contient un tel détecteur
CN112973196A (zh) * 2021-03-15 2021-06-18 江苏大航有能输配电有限公司 利用压强差和液体内含气体产生的气动力进行高粘度液体真空脱泡的方法
EP4092335A1 (fr) 2021-05-21 2022-11-23 Olymp Werk GmbH Dispositif supplémentaire pour système de thermorégulation et système thermorégulation pourvu d'unité de désinfection

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT2554U1 (de) * 1997-01-31 1998-12-28 Apaco App Ag Verfahren und vorrichtung zur entgasung von heizungswasser in einer heizungsanlage
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
AT409661B (de) * 1997-11-26 2002-10-25 Schwarz A & Co Verfahren zur steuerung einer vorrichtung zur entgasung einer in einem flüssigkeitskreislaufsystem zirkulierenden flüssigkeit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108266A2 (fr) * 1982-10-06 1984-05-16 Hans-Friedrich Bernstein Dispositif de dégazage de liquides circulants
EP0292814A1 (fr) * 1987-05-15 1988-11-30 Hans-Friedrich Bernstein Dispositif de régulation, en pression et en volume, d'un liquide circulant en circuit clos
AT396521B (de) * 1991-04-24 1993-10-25 Schwarz A & Co Vorrichtung zur entgasung von flüssigkeiten in flüssigkeitskreislaufsystemen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3068606D1 (en) * 1979-09-13 1984-08-23 Vaillant Joh Gmbh & Co Pump with degasser
AT399217B (de) * 1991-11-22 1995-04-25 Schwarz A & Co Vorrichtung zur expansionsübernahme in flüssigkeitskreislaufsystemen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108266A2 (fr) * 1982-10-06 1984-05-16 Hans-Friedrich Bernstein Dispositif de dégazage de liquides circulants
EP0292814A1 (fr) * 1987-05-15 1988-11-30 Hans-Friedrich Bernstein Dispositif de régulation, en pression et en volume, d'un liquide circulant en circuit clos
AT396521B (de) * 1991-04-24 1993-10-25 Schwarz A & Co Vorrichtung zur entgasung von flüssigkeiten in flüssigkeitskreislaufsystemen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29510126U1 (de) * 1995-06-22 1995-10-12 Bernstein, Hans Friedrich, 82211 Herrsching Armaturen, insbesondere für den Ausdehnungs- und Entspannungsbehälter eines Flüssigkeitskreislaufsystems
EP0902239A3 (fr) * 1997-09-13 2001-04-25 Reflex Winkelmann + Pannhoff GmbH + Co. Dispositif de maintien de pression à commande par fluide
EP0924472A2 (fr) 1997-11-26 1999-06-23 A. Schwarz + Co. Méthode pour contrÔler un appareil pour dégazer et contrÔler la pression d'un liquide circulant dans un circuit, en particulier une installation de chauffage
EP0924472A3 (fr) * 1997-11-26 2001-05-23 A. Schwarz + Co. Méthode pour contrôler un appareil pour dégazer et contrôler la pression d'un liquide circulant dans un circuit, en particulier une installation de chauffage
EP3211330A1 (fr) 2016-02-25 2017-08-30 Sercal Belgium BVBA Procédé et détecteur pour détecter des bulles d'air ou des poches d'air dans un système, ainsi qu'une installation qui contient un tel détecteur
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
CN112973196A (zh) * 2021-03-15 2021-06-18 江苏大航有能输配电有限公司 利用压强差和液体内含气体产生的气动力进行高粘度液体真空脱泡的方法
EP4092335A1 (fr) 2021-05-21 2022-11-23 Olymp Werk GmbH Dispositif supplémentaire pour système de thermorégulation et système thermorégulation pourvu d'unité de désinfection

Also Published As

Publication number Publication date
ATA6094A (de) 1995-12-15
AT401293B (de) 1996-07-25

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