EP1065448A1 - Gerät für das Konstanthalten des Druckes in einem Stromkreis durch das Zuführen von Flüssigkeit aus einem Behälter - Google Patents

Gerät für das Konstanthalten des Druckes in einem Stromkreis durch das Zuführen von Flüssigkeit aus einem Behälter Download PDF

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Publication number
EP1065448A1
EP1065448A1 EP00202338A EP00202338A EP1065448A1 EP 1065448 A1 EP1065448 A1 EP 1065448A1 EP 00202338 A EP00202338 A EP 00202338A EP 00202338 A EP00202338 A EP 00202338A EP 1065448 A1 EP1065448 A1 EP 1065448A1
Authority
EP
European Patent Office
Prior art keywords
fluid
operating
pumping
line circuit
pressure
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Withdrawn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
EP00202338A
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English (en)
French (fr)
Inventor
Geuko Van Der Veen
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.)
Gastec NV
Original Assignee
Gastec NV
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 Gastec NV filed Critical Gastec NV
Publication of EP1065448A1 publication Critical patent/EP1065448A1/de
Withdrawn legal-status Critical Current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
    • 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
    • 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

Definitions

  • the invention relates to an apparatus for keeping a fluid line circuit at a pressure by supplying fluid coming from a fluid reservoir
  • the apparatus comprising a pumping device having an operating part and a pumping part, a pumping element of the pumping part being connected to an operating element of the operating part such that the pumping element makes a pumping stroke as a result of an operating stroke of the operating element and thus pumps an amount of fluid into the line circuit
  • the pumping part comprising a pressure pipe and a suction pipe, a suction opening of the suction pipe being located in the fluid reservoir, the pressure pipe putting the pumping part in fluid communication with the line circuit, the pressure pipe having arranged therein a check valve for preventing fluid from flowing from the line circuit to the pumping part, the suction pipe having arranged therein a check valve for preventing fluid flowing from the pumping part to the fluid reservoir.
  • Such an apparatus is known from German patent DE-A 26 57853.
  • This known apparatus is intended to fill up a central heating line circuit of a central heating system by pumping water from the reservoir into the line circuit.
  • the pumping is carried out by means of a pumping stroke of a pump diaphragm effected by the operating stroke of an operating diaphragm.
  • the operating stroke takes place under the influence of the superatmospheric water pressure of a public water supply system.
  • the check valve arranged in the pressure pipe, is opened under the influence of the excess pressure prevailing in the pump diaphragm housing, allowing water to flow from the pump diaphragm housing into the line circuit.
  • a drawback of the known invention is that the operating stroke occurs under the influence of the superatmospheric pressure of an external fluid source, i.e. the water supply system.
  • an external fluid source i.e. the water supply system.
  • the operating diaphragm with its associated diaphragm housing on the one hand and the external fluid source on the other need first of all to be intercoupled by means of a relatively complicated pipe/valve system.
  • this known apparatus can only be used when an external fluid source being under a sufficient pressure, such as the public water supply system, is actually present.
  • the object of the invention is to provide a simplified apparatus for filling a fluid line circuit with fluid coming from a fluid reservoir, without the operating stroke of the operating element taking place under the influence of the superatmospheric pressure of an external fluid source.
  • the apparatus according to the invention is characterized in that a fluid line puts the operating part of the pumping means in fluid communication with the line circuit, the operating element being arranged to make the operating stroke at an increase of the fluid pressure prevailing in the line circuit, the operating element and the pumping element having such dimensions that at an increase of the fluid pressure in the line circuit, the force generated by the operating element is greater than an opposing force of the fluid on the pumping element, causing the operating element to make an operating stroke and the pumping element to make a pumping stroke.
  • the pressure in the line circuit of a central heating system will vary considerably under the influence of changes in temperature of the water in the central heating system. In line circuits of a different type, pressure variations may occur through other causes.
  • the operating element will make an operating stroke because the operating element and the pumping element are dimensioned such that, at an increase of the fluid pressure in the line circuit, the force generated by the operating element is greater than an opposing force of the fluid on the pumping element.
  • the operating element makes an operating stroke and consequently, the pumping element makes a pumping stroke, with fluid present in the pumping part being pressed into the line circuit. The degree of filling is therefore further increased.
  • the apparatus for its functioning no electric connection is necessary, so there is no consumption of electricity either, which is in fact the case in large central heating systems provided with a degassing and replenishing apparatus with an electric filling pump. Moreover, unlike the traditionally used filling pumps, the apparatus is silent. Furthermore, the loss of water is minimal, for only leakage losses need to be compensated. In the above-mentioned known German apparatus, water is consumed as an operating medium in order to generate the necessary pumping force. Furthermore, the apparatus can be of a very compact design, so that it can easily be built in.
  • the operating part of the pumping device receives a part of the volume changes in the line circuit caused by temperature changes, a smaller expansion tank can be used, which is very advantageous in view of the room required for building in.
  • the expansion tank can also have smaller dimensions because the line circuit is always filled to a maximum.
  • the operating element and, accordingly, the pumping element move back after having made the operating and pumping stroke respectively.
  • the return movement can be energized by the atmospheric pressure exerted on the pumping element.
  • the apparatus is characterized in that it is provided with a spring forcing the operating element into a position from which the operating element, at an increase of the fluid pressure in the line circuit, can make an operating stroke.
  • the spring has a spring constant and bias such that, if the fluid in the line circuit has a pressure of less than approximately 1 bar, the spring forces the operating element into a position from which the operating element can make the operating stroke. It will be clear that the spring constant and the bias of the spring can be adjusted to the pipe pressure desired for a relevant application.
  • the operating element will then be in the above-mentioned position at such a relatively low pressure that, at least in case of an increase of fluid pressure in the line circuit, it can make an operating stroke, as a result of which the circuit is replenished by a pumping stroke of the pumping element.
  • the fluid line can be in fluid communication with an expansion tank through a first conduit having a spring-loaded check valve, which spring-loaded check valve, above a given pressure in the fluid line, passes fluid from the fluid line to the expansion tank, the fluid line being in fluid communication with the expansion tank through a second conduit having a spring-loaded check valve, which spring-loaded check valve, below a given pressure in the fluid line, passes fluid from the expansion tank to the fluid line.
  • a float be arranged in the fluid reservoir, which float operates an admission valve, which admission valve is accommodated in a supply line being in fluid communication with a fluid source, thereby maintaining a minimum fluid level in the fluid reservoir.
  • the line circuit can be provided with a overflow valve, which overflow valve opens when the pressure in the line circuit is too high, the overflow valve being provided with an overflow conduit which opens into the fluid reservoir, so that fluid released by the overflow valve finds its way into the fluid reservoir. Moreover, the separated gases are removed from the line circuit through this overflow valve.
  • the overflow conduit can include a jet nozzle for creating a reduced pressure in the fluid to be discharged, which promotes the degassing of the fluid.
  • the operating part comprises an operating piston/cylinder assembly, the operating element being the operating piston, the pumping part comprising a pump piston/cylinder assembly of which the pumping element is the pump piston.
  • the operating and pumping parts can also comprise an operating diaphragm/diaphragm housing assembly and a pump diaphragm/diaphragm housing assembly respectively.
  • the exemplary embodiment shown in Fig. 1 is an apparatus for keeping a line circuit 1 at superatmospheric pressure through the supply of fluid coming from a reservoir 10.
  • the exemplary embodiment is provided with an operating piston/cylinder assembly 3, 4 and a pump piston/cylinder assembly 5, 6.
  • the pump piston 5 is connected to the operating piston 3, such that the pump piston 5 follows the movement of the operating piston 3.
  • the operating piston/cylinder assembly 3,4 is provided with a fluid pipe 13 which is in fluid communication with the line circuit 1.
  • the pump piston/cylinder assembly 5, 6 is provided with a pressure pipe 7 and a suction pipe 8.
  • a suction opening 9 of the suction pipe 8 is located in a fluid reservoir 10 in which an atmospheric pressure prevails.
  • the pressure pipe 7 puts the pump cylinder 6 in fluid communication with the line circuit 1.
  • a check valve 11 Positioned in the pressure pipe 7 is a check valve 11 for preventing the flow of fluid from the line circuit 1 to the pump cylinder 6.
  • a check valve 12 is positioned for preventing the flow of fluid from the pump cylinder 6 to the fluid reservoir 10.
  • the apparatus is provided with a spring 14, forcing the operating piston 3 and, accordingly, the pump piston 5 into a position from which the operating piston, at an increase of the fluid pressure in the line circuit 1, can make an operating stroke.
  • the spring constant and the bias of the spring 14 are such that when the fluid in the line circuit has a pressure of less than approximately 1 bar, the spring 14 forces the operating piston 3 into the position from which the operating piston 3, at an increase of the fluid pressure in the line circuit, can make an operating stroke.
  • the diameter of the operating cylinder 4 is larger than the diameter of the pump cylinder 6, so that at an increase of the fluid pressure in the line circuit 1, the force generated by the operating piston 3 is greater than an opposing force from the fluid on the pump piston 3. As a consequence, the operating piston 3 makes an operating stroke and the pump cylinder 5 makes a pumping stroke.
  • the exemplary embodiment has an overflow valve 27 which opens when the pressure in the line circuit 1 is too high.
  • the overflow valve 27 is provided with an overflow conduit 28 opening into the fluid reservoir 10, so that fluid released from the overflow valve 27 ends its way into the fluid reservoir 10.
  • the working principle of the exemplary embodiment in Fig. 1 is as follows: because the diameter of the operating cylinder 4 is larger than the diameter of the pump cylinder 6, at an increase of the pressure in the line circuit 1, the operating piston 3 will be inclined to move to the right. Fluid present in the pump cylinder 6 will then be pumped via the pressure pipe 7 into the line circuit 1. Generally, the increase of the fluid pressure in the line circuit 1 will be the result of heating of the fluid. When the temperature of the fluid in the line circuit 1 falls, the fluid pressure in the line circuit 1 decreases as well.
  • the spring constant and the bias of the spring 14 are chosen such that at a fluid pressure in the line circuit of less than approximately 1 bar, the spring 14 forces the operating piston 3 into the left position from which the operating piston 3 can make another operating stroke.
  • the pump piston 5 draws in fluid through the suction pipe 8 from the fluid reservoir 10.
  • the fluid reservoir 10 is provided with a float 24, which float 24 controls an admission valve 25.
  • the admission valve 25 is incorporated in a supply line 26 which is in fluid communication with a fluid source 2 such as, for instance, the public water supply system, so that a minimum level of fluid is kept in the fluid reservoir 10.
  • a fluid source 2 such as, for instance, the public water supply system
  • the fluid pipe 13 connecting the operating cylinder 4 with the line circuit 1 is in fluid communication with an expansion tank 21 via a first conduit 19 having a spring-loaded check valve 20.
  • the spring-loaded check valve 20 should, above a particular pressure in the fluid pipe 13, allow the passage of fluid from the fluid pipe 13 to the expansion tank 21.
  • a second conduit 22 having a spring-loaded check valve 23 also puts the fluid pipe 13 in fluid communication with the expansion tank 21, with the spring-loaded check valve 23 being positioned such that, below a particular pressure in the fluid pipe 13, the check valve allows the passage of fluid from the expansion tank 21 to the fluid pipe 13.
  • the expansion tank can have a smaller volume than is normally customary in a line circuit of this type. This is very advantageous because the room for building in a central heating system becomes increasingly smaller.
  • the apparatus can be used with different types of line circuits 1, for instance a water or oil line circuit for heating, for instance central heating, provided with radiators and/or floor heating, and of different types of waterheaters such as, for instance, a heating boiler or a solar boiler.
  • line circuits for instance a water or oil line circuit for heating, for instance central heating, provided with radiators and/or floor heating, and of different types of waterheaters such as, for instance, a heating boiler or a solar boiler.
  • the apparatus can be applied for keeping a gas or oil line circuit at a superatmospheric pressure in which varying pressures occur, above a given minimum pressure.
  • the spring can also be constructed as a gas spring.

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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)
  • Details Of Reciprocating Pumps (AREA)
EP00202338A 1999-07-01 2000-07-03 Gerät für das Konstanthalten des Druckes in einem Stromkreis durch das Zuführen von Flüssigkeit aus einem Behälter Withdrawn EP1065448A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1012485A NL1012485C2 (nl) 1999-07-01 1999-07-01 Inrichting voor het door toevoer van water afkomstig uit een openbaar waterleidingnet op boven atmosferischedruk houden van een gesloten centraal verwarming-leidingcircuit.
NL1012485 1999-07-01

Publications (1)

Publication Number Publication Date
EP1065448A1 true EP1065448A1 (de) 2001-01-03

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EP00202338A Withdrawn EP1065448A1 (de) 1999-07-01 2000-07-03 Gerät für das Konstanthalten des Druckes in einem Stromkreis durch das Zuführen von Flüssigkeit aus einem Behälter

Country Status (2)

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EP (1) EP1065448A1 (de)
NL (1) NL1012485C2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3415825A1 (de) * 2017-06-14 2018-12-19 Honeywell Technologies Sarl Heizkreislaufnachfüllvorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2461549A1 (de) * 1974-12-27 1976-07-08 Albrecht Rodermund Anlage zum automatischen einspeisen einer unter druck stehenden fluessigkeit in ein anderes, einen unterschiedlichen druck fuehrendes fluessigkeitssystem, insbesondere zum nachfuellen von trinkwasser in eine heizungsanlage
DE2657853A1 (de) * 1975-12-23 1977-07-14 Albrecht Rodermund Anlage zum automatischen einspeisen einer unter druck stehenden fluessigkeit in ein anderes, einen unterschiedlichen druck fuehrendes fluessigkeitssystem, insbesondere zum nachfuellen von trinkwasser in eine heizungsanlage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2461549A1 (de) * 1974-12-27 1976-07-08 Albrecht Rodermund Anlage zum automatischen einspeisen einer unter druck stehenden fluessigkeit in ein anderes, einen unterschiedlichen druck fuehrendes fluessigkeitssystem, insbesondere zum nachfuellen von trinkwasser in eine heizungsanlage
DE2657853A1 (de) * 1975-12-23 1977-07-14 Albrecht Rodermund Anlage zum automatischen einspeisen einer unter druck stehenden fluessigkeit in ein anderes, einen unterschiedlichen druck fuehrendes fluessigkeitssystem, insbesondere zum nachfuellen von trinkwasser in eine heizungsanlage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3415825A1 (de) * 2017-06-14 2018-12-19 Honeywell Technologies Sarl Heizkreislaufnachfüllvorrichtung

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NL1012485C2 (nl) 2001-01-03

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