EP0301016B1 - Dispositif de dosage et de melange de systemes a composants fluides multiples - Google Patents

Dispositif de dosage et de melange de systemes a composants fluides multiples Download PDF

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Publication number
EP0301016B1
EP0301016B1 EP87902376A EP87902376A EP0301016B1 EP 0301016 B1 EP0301016 B1 EP 0301016B1 EP 87902376 A EP87902376 A EP 87902376A EP 87902376 A EP87902376 A EP 87902376A EP 0301016 B1 EP0301016 B1 EP 0301016B1
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EP
European Patent Office
Prior art keywords
component
pressure
chamber
bellows
metering
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
EP87902376A
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German (de)
English (en)
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EP0301016A1 (fr
Inventor
Hans Willi Meinz
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Individual
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Individual
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Priority to AT87902376T priority Critical patent/ATE61946T1/de
Publication of EP0301016A1 publication Critical patent/EP0301016A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/882—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances
    • B01F35/8823—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise using measuring chambers, e.g. volumetric pumps, for feeding the substances using diaphragms or bellows

Definitions

  • the invention relates to a device for metering and mixing flowable multicomponent systems, in particular polyurethane systems, with at least one cylinder space arranged in a cylinder housing for each component, with a displacement element in each cylinder space coupled in synchronism with the cycle and conveying synchronously, each cylinder space through the displacement element into a component space and dividing a pressure chamber and to each component chamber a supply line supplying the respective component under pressure is connected, with at least one displacement element designed as a bellows, one end of which is hermetically sealed and supported on the cylinder housing and the other end of which is closed by a base, and with a mixing chamber to which the component rooms are connected.
  • Such a device is known from US-A-4,132,483.
  • This known device consists of one Cylinder space with a bellows for each component, each bellows dividing the associated cylinder space into a component space and a pressure space filled with hydraulic fluid.
  • a plunger plunges into each pressure chamber, which is sealed off from the environment by a dynamic seal.
  • the plungers of all components are mechanically driven by a common, rotatable yoke.
  • a disadvantage of this known device is the great design effort and the dynamic seal on the plunger, which have leakage losses even with a perfect seal. As a result, the stroke range of the bellows shifts progressively, which leads to the destruction of the bellows if the leakage losses are not continuously checked and are returned to the pressure chamber by a leakage supplement device so that the liquid volume enclosed in the pressure chamber always remains constant.
  • DE-C-31 28 666 also discloses a device for metering two-component systems, in particular polyurethane components, which consists of three cylinder spaces arranged axially one behind the other, each of which is assigned a piston covered with a rolling membrane.
  • the three pistons are connected to a common piston rod.
  • Two of the pistons are designed as metering pistons for one component each, the third piston is necessary so that the pressure in the pressure chambers of the metering cylinders is always lower than the pressure in the component rooms, since otherwise the rolling membranes cannot roll onto the metering pistons.
  • a disadvantage of this known device is both the great design effort and the often inadequate chemical resistance of the currently available rolling membranes to many common components. Disadvantageous is also that the fixed dosage ratio of the components can only be changed with great structural effort.
  • the object of the present invention is to design a device for metering and mixing flowable multicomponent systems in such a way that it is both the most abrasive, e.g. materials that tend to crystallize, as well as chemically aggressive liquids can be processed, the dosage ratio being able to be changed as desired in a manner known per se.
  • This device therefore has two or more displacement elements which are coupled to one another in a clock-synchronized and conveyor-synchronous manner, at least one displacement element consisting of a flexible bellows and the other displacement elements can be designed, for example, as conventional pistons.
  • all displacement elements will be designed as bellows, since in most cases they enable much cheaper and more durable designs than conventional pistons and cylinders.
  • the operational readiness or the service life of the device is not impaired by corrosion or deposits.
  • the bellows are completely wear-free. Even if deposits form on the surfaces of the bellows during operation, there are no serious malfunctions. Furthermore, the inner surfaces of the cylinders do not need to be machined when bellows are used.
  • the device according to the invention offers many advantages in terms of maintenance and operational safety.
  • the components can be metered batchwise. Depending on the size of the bellows, shot volumes of up to 50 liters can be achieved.
  • Automatic control of the working and filling stroke is expedient. With automatic control, the component spaces are automatically refilled after each shot from compressed gas-laden storage containers. The filling times are so short with this system concept that they generally do not have a disturbing effect even with large shot volumes.
  • the device according to the invention can implement any desired metering ratio in any pressure range, since the bellows are always loaded only by an extremely low differential pressure.
  • the device can be designed such that each pressure chamber is connected to the same pressure source p2.
  • This design enables a particularly simple drive by pressurizing the displacement elements by means of a pressure source.
  • the device can be designed so that the flexible bellows consists of austenitic stainless steel.
  • This embodiment is particularly advantageous when the temperatures of the components to be dosed are high (above 150 ° C), the components are particularly chemically aggressive (e.g. liquid alkali metals) or particularly abrasive (e.g. liquid plastics with mineral fillers).
  • the components are particularly chemically aggressive (e.g. liquid alkali metals) or particularly abrasive (e.g. liquid plastics with mineral fillers).
  • the device can be designed such that the flexible bellows consists of polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the chemical resistance of polytetrafluoroethylene exceeds that of all elastomers and other thermoplastics. Only liquid alkali metals and some fluorine compounds attack the material PTFE at higher pressures and temperatures.
  • the bellows are made of PTFE without cutting from preformed blanks, and the bellows can also be formed with a closed bottom. Commercial PTFE bellows achieve a number of cycles of 107 to 109. With the same displacement volume, the cost of a PTFE bellows is much lower than that of a stainless steel bellows.
  • the device can be designed such that the flexible bellows consists of an extrusion or injection-blown thermoplastic.
  • the bellows made of thermoplastic materials by extrusion or injection blow molding are characterized by high resistance to many chemicals and by an unrivaled low price compared to all other bellows designs. They can therefore be regarded as cheap disposable parts that can be replaced with little effort, for example to remove component deposits or the fixed dosage ratio of To change components. As a rule, the bellows will be designed with a closed bottom, so that the displacement element consists of only one component. A two-part version with a separately manufactured base is only recommended if standard bellows are to be used (e.g. for small series).
  • This exemplary embodiment relates to a device in a low-pressure version for discontinuous two-component metering.
  • the Fig. Shows a particularly simple embodiment of the invention, in which the device in two-component design with two axially successively arranged cylinder chambers and each with an associated bellows and a connected mixing chamber and two storage containers for the two components is formed, the metering stroke by pneumatic pressure application of the bellows in the low pressure range.
  • the device shown consists essentially of two axially successively arranged cylinder spaces 1, 2 with bellows 3, 4 located therein, which are firmly connected to one another via a piston rod 5 and which each of the cylinder spaces 1, 2 in a component space 6, 7 and in a pressure space Divide 8, 9. Furthermore, the device has two storage containers 12, 13, each of which is connected to the component spaces 6, 7 via a check valve 10, 11, and a mixing chamber 14, which is connected directly to the component space 6 and to the component space 7 via a check valve 15 and to a compressed air line 16 .
  • the cylinder spaces 1, 2 are designed with the same diameter, so that any dosage ratio can be achieved by exchanging the bellows 4.
  • the bellows 3, 4 used here are stockable PTFE pointed bellows of the same overall length with different diameters according to the desired dosage ratio, the bottoms 17, 18 of which are made of sheet steel and which have divided steel flanges 19, 20, 21, 22 on the cylinder covers 23, 24 and Floors 17, 18 are fastened by screws, whereby spring elements or resilient elastomer inserts between the steel flange 19, 20, 21, 22 and bellows flange 25, 26, 27, 28 are to be used under the screws in order to provide an effective seal between the component space 6 , 7 and pressure chamber 8, 9 to reach.
  • the piston rod 5 which is only claimed by the pressure p2, which is loaded on its cross-sectional area, is correspondingly light in construction and is supported in two piston rod guides 29, 30 made of PTFE and each by means of a self-tightening PTFE sleeve packing 31, 32 between the pressure chamber 8 and the component room 7 and atmosphere sealed.
  • the check valves 10, 11, 15 are designed without spring loading, which enables an extremely low opening pressure. These valves 10, 11, 15 only close under the dead weight of the valve balls 33, 34, 35, which, however, makes a vertical installation position absolutely necessary during installation.
  • the components are supplied to the mixing chamber 14 via hose lines 36, 37, 16, two shut-off valves 38, 39 being located on the mixing chamber 14, which are expediently designed as pneumatically actuated piston spools.
  • the pressure level in the pressure rooms 8, 9 and the component rooms 6, 7 is almost the same for all operating states of the device is equal to.
  • This condition is particularly easily met in the device according to the drawing by compressed air loading of the pressure chambers 8, 9 and the reservoir 12, 13, the pressures p1 and p3 being kept at a constant pressure level with p1 ⁇ p3 and the pressure p2 being raised to p3 during the working stroke and is lowered to p 1 during the filling stroke.
  • the differential pressure between the component spaces 6, 7 and the pressure spaces 8, 9 does not rise to an impermissibly high level.
  • the bellows 4 synchronously conveys the component 42 from the component space 7 via the open check valve 15 into the compressed air line 16, the component 42 supplied to the compressed air 41 being pressed into the mixing chamber 14 by the flowing compressed air 41 and being fed there directly to the mixing chamber 14 Component 40 is mixed.
  • the metering stroke can be interrupted at any time by simultaneously closing the two shut-off valves 38, 39.
  • the filling of the component rooms 6, 7 takes place from the storage containers 12, 13 by lowering the pressure p2 in the pressure rooms 8, 9 to the pressure p1, which is always in the storage containers 12, 13 by compressed air loading via permanently set pressure reducers (not shown) constant pressure level is maintained.
  • the pressure p3 in the compressed air line 16 leading to the mixing chamber 14 is always kept constant at a fixed, in comparison to p1 higher pressure level.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Un dispositif de dosage et de mélange de systèmes à composants fluides multiples comprend comme éléments de déplacement des soufflets (3, 4; 47, 48, 49, 50) agencés chacun dans une chambre cylindrique (1, 2; 43, 44, 45, 46) pour chaque composant et synchronisés de façon à travailler ensemble. Ils divisent chaque chambre cylindrique (1, 2; 43, 44, 45, 46) en une chambre à composant (6, 7; 51, 52, 53, 54) et en une chambre à pression (8, 9; 5, 56, 57, 58), la pression dans les chambres à pression (8, 9; 5, 56, 57, 58) étant toujours presque la même que dans les chambres à composants (6, 7; 51, 52, 53, 54). Les chambres à composants sont reliées chacune par une soupape d'obturation (38, 39; 70, 71, 72, 73) à une chambre de mélange (14) et par une autre soupape d'obturation (10, 11; 66, 67, 68, 69) à un réservoir (12, 13).

Claims (5)

1. Dispositif de dosage et de mélange de systèmes à composants fluides multiples, en particulier les systèmes de polyuréthane, avec au moins une chambre cylindrique (1, 2) équipée d'un boîtier cylindrique pour chaque composant, avec dans chaque chambre cylindrique un élément compresseur couplé de manière synchrone à la cadence et à la manutention (3, 4). Chaque chambre cylindrique (1, 2) est divisée par l'élément compresseur (3, 4) en une chambre à composants (6, 7) et une chambre de pression. L'arrivée d'un des composants sous pression est raccordée à chaque chambre des composants (6, 7) et au moins à un des éléments compresseurs (3, 4) construit en forme de soufflet, dont une extrémité est fermée et bute contre le boîtier cylindrique et dont l'autre extrémité est fermée par un fond (17, 18). Ces extrémités sont raccordées à la chambre des composants (6, 7) par une chambre de mélange (14). Ce dispositif est caractérisé en ce que les chambres cylindriques (1, 2) sont alignées de manière axiale et que les éléments compresseurs qui y sont fixés (3, 4) sont raccordés l'un à l'autre par une tige de piston (5).
2. Dispositif selon la revendication 1, caractérisé en ce que chaque chambre de pression (8, 9) est raccordée à la même source de pression p2.
3. Dispositif suivant la revendication 1, caractérisé en ce que le soufflet flexible (3, 4) est réalisé en acier inoxydable austénitique.
4. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le soufflet flexible (3 ou 4) est réalisé en polytetrafluoréthylène (PTFE).
5. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le soufflet flexible (3 ou 4) est réalisé en matière synthétique thermoplastique extrudée ou injectée.
EP87902376A 1986-04-08 1987-04-04 Dispositif de dosage et de melange de systemes a composants fluides multiples Expired - Lifetime EP0301016B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87902376T ATE61946T1 (de) 1986-04-08 1987-04-04 Vorrichtung zum dosieren und mischen von fliessfaehigen mehrkomponentensystemen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3611728 1986-04-08
DE3611728A DE3611728C1 (de) 1986-04-08 1986-04-08 Vorrichtung zum Dosieren und Mischen von fliessfaehigen Mehrkomponentensystemen

Publications (2)

Publication Number Publication Date
EP0301016A1 EP0301016A1 (fr) 1989-02-01
EP0301016B1 true EP0301016B1 (fr) 1991-03-27

Family

ID=6298193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87902376A Expired - Lifetime EP0301016B1 (fr) 1986-04-08 1987-04-04 Dispositif de dosage et de melange de systemes a composants fluides multiples

Country Status (4)

Country Link
EP (1) EP0301016B1 (fr)
AU (1) AU7232287A (fr)
DE (2) DE3611728C1 (fr)
WO (1) WO1987006154A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996002319A2 (fr) * 1994-07-19 1996-02-01 Applied Chemical Solutions, Inc. Appareil et procede de melange de produits chimiques en suspension
DE19618591A1 (de) * 1996-05-09 1997-11-13 Micafil Vakuumtechnik Ag Vorrichtung zum Fördern dosierter Mengen mindestens zweier fliessfähiger Komponenten einer reaktiven Masse
DE19819271A1 (de) * 1998-04-30 1999-11-11 Guenther Kramb Dosiervorrichtung für eine Emulgieranlage
BE1026239B1 (nl) * 2018-04-26 2019-11-26 Soudal Apparaat en werkwijze voor het daarmee produceren en dispenseren van een reactiemengsel

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2788953A (en) * 1954-02-11 1957-04-16 Cayton Inc Automatic proportional metering, mixing, and dispensing system
US3100451A (en) * 1961-01-24 1963-08-13 Alexander S Limpert Proportioning pump
US3524714A (en) * 1968-10-30 1970-08-18 Us Air Force Pneumatic bellows pump
US3836335A (en) * 1973-06-01 1974-09-17 Corning Glass Works Reagent storage and dispensing system
US4060178A (en) * 1974-05-10 1977-11-29 Miller Mfg. Co. Of Schiller Park, Inc. Metering pump
US4132483A (en) * 1975-01-17 1979-01-02 Kimball International, Inc. Molding machine with proportional dispensing
DE2910798C2 (de) * 1979-03-20 1985-05-02 Meinz, Willi, 5100 Aachen Vorrichtung zur Polyurethanverschäumung
DE3128666C2 (de) * 1981-07-20 1984-07-05 Hans Willi 5100 Aachen Meinz Vorrichtung zur Dosierung von Zweikomponentensystemen

Also Published As

Publication number Publication date
AU7232287A (en) 1987-11-09
DE3611728C1 (de) 1987-04-16
WO1987006154A1 (fr) 1987-10-22
DE3768952D1 (de) 1991-05-02
EP0301016A1 (fr) 1989-02-01

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