EP0716725A1 - Dispositif servant a accumuler ou a guider un liquide - Google Patents

Dispositif servant a accumuler ou a guider un liquide

Info

Publication number
EP0716725A1
EP0716725A1 EP95923590A EP95923590A EP0716725A1 EP 0716725 A1 EP0716725 A1 EP 0716725A1 EP 95923590 A EP95923590 A EP 95923590A EP 95923590 A EP95923590 A EP 95923590A EP 0716725 A1 EP0716725 A1 EP 0716725A1
Authority
EP
European Patent Office
Prior art keywords
container
tube
foregoing
pressure
liquid
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Withdrawn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
EP95923590A
Other languages
German (de)
English (en)
Inventor
Jan Henk Cnossen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0716725A1 publication Critical patent/EP0716725A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/18—Anti-extrusion means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/086—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor the gas cushion being entirely enclosed by the separating means, e.g. foam or gas-filled balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3154—Accumulator separating means having flexible separating means the flexible separating means being completely enclosed, e.g. using gas-filled balls or foam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports

Definitions

  • the invention relates to a device for accumulating or guiding a liquid under varying pressure, which comprises a container connected to an inlet and an outlet.
  • such a device forms an accumulator, or expansion tank, which is generally applied in systems in which flows of liquid under pressure are used. Examples hereof are hydraulic installations and cooling and heating installations. Such an accumulator is used in these cases as storage container for the liquid under pressure or to damp pressure peaks.
  • the accumulator In a normal central heating device the accumulator is used to absorb the volume changes in the heating water as resulting from variations in temperature of that water. In cooling installations the expansion tank likewise functions to absorb the volume changes in the cooling medium resulting from variations in the temperature of that medium.
  • Pressure accumulators are usually embodied with a flexible membrane which closes off on one side a space in which the liquid can be absorbed and on the other side is loaded with spring or gas pressure. It is known that the life-span of usual accumulators, particularly of the membrane thereof, is limited. During the total life-span of a central heating installation therefore, the expansion tank has to be replaced a number of times because the membrane has developed a leak.
  • such a device forms a tube in a piping system in which flows of liquid under pressure are again used. In such a system the tubes can for instance be connected to other tubes or flow control elements, such as valves, taps and vents.
  • a known phenomenon in piping systems comprising valves, taps or vents is the so-called water shock. This phenomenon involves a shock wave moving through the liquid, and therefore through the system, when a valve, tap or vent is abruptly closed or opened.
  • a drawback hereof is that it results in a loud noise.
  • Another drawback is that disturbances can be caused in any measuring or control equipment present in the system as a result of the water shock.
  • the structural reliability of the system can also be adversely affected if the water shock occurs regularly over a period of time.
  • a device which is distinguished by at least one elastic compressible body in the container.
  • the volume of the body decreases so that the free volume available for the liquid increases. As the pressure decreases the body again expands.
  • the container forms a heat exchanger, for example a convector in a heating installation or a condenser in a cooling installation.
  • a heat exchanger with the properties of a device according to the invention fulfills the function of the accumulator or expansion tank, thus doing away with the need for a separate accumulator or expansion tank. This provides a particular advantage with regard to the cost and complexity of the system.
  • the body is preferably manufactured from a foam - material with a closed cell structure.
  • Materials suitable for application in the invention are polyethylene foam, ethylene-vinyl-acetate foam and foamed silicone rubber and the like. The choice of the material depends inter alia on the operating temperature, the compatibility with the liquid for accumulating and the maximum pressure occurring.
  • Figure l shows in partly broken away perspective view a device according to the invention embodied as expansion tank in a heating installation.
  • Figure 2 shows a diagram of a central heating system in which is incorporated the expansion tank shown in figure 1.
  • Figure 3 shows the graph of the expansion of CH water plotted against the temperature.
  • Figure 4 shows a partly broken away perspective view of a device according to the invention, which is embodied as heating convector.
  • Figure 5 shows schematically an example of a hydraulic device in which a device according to the invention is applied.
  • the accumulator 1 shown in figure 1 is intended to function as expansion tank in a CH installation.
  • the device 1 consists of tank 2 which encloses a space 3.
  • CH water can flow via the inlet/outlet 5 into this space 3 and then out again therefrom.
  • the body is formed by a block of foam material 6 with a closed cell structure, which block of foam material 6 is received in space 3 and fixed to the inlet/outlet 5, wherein the block of foam material 6 hangs in the space 3 so that in the embodiment shown here the inlet/outlet 5 forms the fixing means for the block of foam material 6.
  • This foam material 6 is for example polyethylene foam with a closed cell structure. Because the foam material 6 has a closed cell structure, it does not absorb any significant amount of water, so that it remains operational as expansion body for a long period.
  • the foam material 6 has a structure, in particular a cell size, such that it can be compressed well with the occurring pressures.
  • FIG. 2 shows schematically a CH installation 10 with a heating boiler 11, to which a piping system 13 is connected.
  • the CH water is pumped round the piping system 13 by means of a pump 12.
  • a plurality of heating convectors 14 is incorporated in the piping system in the usual manner. If the accumulator 1 is arranged at or close to the highest point of the installation 10, the pressure of the CH water at this location will vary between a minimum of 0.5 bar and a maximum of 3 bar. With placing at a lower level these pressures are higher, corresponding with the height of the water column above the expansion tank.
  • the water expands by about 3% with an increase in temperature from 10 to 80"C.
  • the accumulator must therefore have a capacity which is at least equal to 3% of the volume of the CH system. If it is further given that, as described above, the minimum pressure amounts to about 0.5 bar and the maximum pressure amounts to 3 bar, the desired elasticity and the desired volume of the foam material are simple to calculate.
  • the accumulator according to the invention can be embodied in favourable manner as heating convector.
  • a separate expansion tank can then be dispensed with.
  • the convector 20 of figure 4 comprises in the usual manner a feed connection 21 which is connected to a feed pipe via a tap 22, and a drain connection 23.
  • a space 24 defined in the convector 20 is a space 24 through which the heating water flows.
  • a body formed from a quantity of foam material 25 with a closed cell structure is received in this space.
  • the device according to the invention can operate at a diversity of pressures.
  • the device according to the invention can thus also be applied as accumulator 36 in a hydraulic system 30 as shown schematically in figure 5.
  • a pump 32 carries hydraulic oil under pressure out of a reservoir 31.
  • the oil under pressure is stored in the accumulator 36 according to the invention.
  • the maximum pressure is limited using a pressure-relief valve 35.
  • a hydraulic motor 33 By operating a valve 34 a hydraulic motor 33 can be fed uniformly with oil under pressure.
  • the container comprises one body placed in the interior thereof which is manufactured from foam material with a closed cell structure and occupies a large part of the available volume in the container. It is however also possible for a large number of smaller elements to be placed in the container.
  • the device comprises enclosing means for the elements in order to prevent these elements falling into the liquid system. These enclosing means can be formed by a partition between the space in the tank and the outlet through which the liquid can flow unobstructed.
  • the container comprises one or more than one body, wherein the or each body is placed in an elastically expandable shell closed off from the liquid as embodiment of the enclosing means, which shell is fixed to the inner wall of the container.
  • the or each elastically compressible body be manufactured from foam material with a closed cell structure, whereby a larger number of materials are suitable for use.
  • this fulfills the function of membrane, such as in known expansion tanks, wherein the or each body provides the necessary counter-pressure as a result of the elastic compressibility thereof. Also in this case the or each body does not have to be made from a foam material with a closed cell structure, provided the membrane is water-tight.
  • the body can be arranged in the container in pre- compressed state. In this case the compression of the body begins above a determined minimum pressure corresponding to the degree of pre-compression.
  • the body When a device according to the invention is applied in the embodiment of a tube through which liquid flows and which is incorporated in a system with flow control elements, the body is preferably placed close to a connection to such a flow control element or to another element in the tube to damp water shock.
  • the body herein preferably forms a layer which is fixed to the inner wall of the tube, which covers the inner surface wholly or partially in radial direction at that location and which extends from the connection in axial direction over a distance which is at most equal to the length of the tube.
  • a layer extends in axial and radial direction over the entire inner surface of the tube, it is suitable to serve as thermal insulation, in addition to the use as insulation against shock waves manifesting themselves for instance as water shock.
  • a body can have an elongate form and be arranged in floating suspension in the flow to the inside wall of the tube.

Abstract

L'invention concerne un dispositif (1) servant à accumuler ou à guider un liquide sous pression variable. Ce dispositif comprend un réservoir (2) accouplé à une entrée (4) et à une sortie (5), ainsi qu'au moins un corps compressible élastiquement (6), situé dans le réservoir (2). Il comprend également des moyens servant à enfermer le corps, ou chaque corps, à l'intérieur du réservoir (2).
EP95923590A 1994-07-01 1995-07-03 Dispositif servant a accumuler ou a guider un liquide Withdrawn EP0716725A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL9401106 1994-07-01
NL9401106 1994-07-01
PCT/NL1995/000233 WO1996001375A1 (fr) 1994-07-01 1995-07-03 Dispositif servant a accumuler ou a guider un liquide

Publications (1)

Publication Number Publication Date
EP0716725A1 true EP0716725A1 (fr) 1996-06-19

Family

ID=19864399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95923590A Withdrawn EP0716725A1 (fr) 1994-07-01 1995-07-03 Dispositif servant a accumuler ou a guider un liquide

Country Status (3)

Country Link
EP (1) EP0716725A1 (fr)
CA (1) CA2170779A1 (fr)
WO (1) WO1996001375A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006084748A1 (fr) * 2005-02-10 2006-08-17 Westphal Werner Reservoir sous pression
GB2566094B (en) * 2017-09-04 2021-07-14 Ideal Boilers Ltd Expansion vessel incorporating a foam core

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1197524A (en) * 1968-03-25 1970-07-08 Automotive Prod Co Ltd Improvements in or relating to Liquid Pressure Storage Devices
DE1963709A1 (de) * 1969-12-19 1971-07-15 Rheinische Metallwerk Gmbh Arm Vorrichtung zum Verhindern oder Reduzieren von Druckschlaegen in Leitungsnetzen
DE3302448A1 (de) * 1983-01-26 1984-07-26 Karlheinz 5800 Hagen Menkhoff Elastomer-hydrospeicher
DE3333597A1 (de) * 1983-09-16 1985-04-18 Wilkhahn Wilkening + Hahne GmbH + Co, 3252 Bad Münder Druckspeicher
US4651781A (en) * 1984-02-02 1987-03-24 Northrop Corporation Distributed accumulator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9601375A1 *

Also Published As

Publication number Publication date
CA2170779A1 (fr) 1996-01-18
WO1996001375A1 (fr) 1996-01-18

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