EP0525864A1 - Vorrichtung zur Abgabe von mindestens zwei Fluida in einem vorherbestimmten Mengenverhältnis - Google Patents

Vorrichtung zur Abgabe von mindestens zwei Fluida in einem vorherbestimmten Mengenverhältnis Download PDF

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Publication number
EP0525864A1
EP0525864A1 EP92202178A EP92202178A EP0525864A1 EP 0525864 A1 EP0525864 A1 EP 0525864A1 EP 92202178 A EP92202178 A EP 92202178A EP 92202178 A EP92202178 A EP 92202178A EP 0525864 A1 EP0525864 A1 EP 0525864A1
Authority
EP
European Patent Office
Prior art keywords
piston
yoke
switch
spring
switch valve
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.)
Granted
Application number
EP92202178A
Other languages
English (en)
French (fr)
Other versions
EP0525864B1 (de
Inventor
Marianus Henrikus Hermina Kuijpers
Jan Hornes
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.)
KUMA RSP BV
Original Assignee
KUMA RSP BV
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Filing date
Publication date
Application filed by KUMA RSP BV filed Critical KUMA RSP BV
Publication of EP0525864A1 publication Critical patent/EP0525864A1/de
Application granted granted Critical
Publication of EP0525864B1 publication Critical patent/EP0525864B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B01F35/8822—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 measuring chambers of the piston or plunger type
    • B01F35/88222—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 measuring chambers of the piston or plunger type without external means for driving the piston, e.g. the piston being driven by one of the components

Definitions

  • the invention relates to a device of the type described in the preamble of the main claim.
  • the element connecting the pistons in each of its two end positions operates a switching mechanism, which in turn controls the drive mechanism of the two-way switching valve, formed by a control cylinder in the embodiment described.
  • the object of the invention is to eliminate this disadvantage. According to the invention this object is achieved through the pistons also being connected to an energy storage device which is charged during the stroke of the pistons and has sufficient capacity to supply the energy needed to switch over the switch valves.
  • the device With such an energy storage device, the device has become totally independent of any external pressure, so that its potential applications are greatly increased, since no energy supply line at all is now needed.
  • the energy storage device is preferably formed by at least one spring which is connected to the pistons and tensioned during their movement.
  • this spring is a leaf spring.
  • the spring system which can be pre-tensioned in two mutually opposed directions, can comprise two coil springs lying in line with each other.
  • an embodiment of the type described in claim 5 is preferred.
  • a preferred embodiment of the control and switching mechanism of the switch valve is the subject of claim 6, and this embodiment is preferably designed in the way described in claims 7 and 8.
  • the embodiment of the delivery device shown in Figure 1, indicated in its entirety by reference number 1, comprises a narrow prismatic housing 2 in which a number of cylinder bores are formed, a cylinder bore 4, a second cylinder bore 6 with the same internal diameter as the bore 4, and a third cylinder bore 8 containing an exchangeable cylinder barrel 10 determining a third bore.
  • the embodiment shown is intended for the delivery of two fluid media, to be described below as component A and component B, in a ratio exactly equal to 1:1.
  • the cylinder bores 4 and 6 are connected in parallel, and are used for metering and delivering component A, while the cylinder bore 8 is used for delivering component B, the sum of the effective piston surfaces in the two bores 4 and 6 being equal to the effective piston surface in the bore 8.
  • This principle and this mode of operation are known per se from FR-A-1,595,934.
  • a piston with a predetermined cross-section area is thus provided in each cylinder bore.
  • this is piston 12, fixed on the piston rod 14 by means of the end nut 16, and sealed relative to the cylinder bore 4 by means of the seals 18 and 20.
  • the piston rod 14 is guided through the cylinder head 22, held by the cylinder nut 24.
  • the piston/piston rod system accommodated in the cylinder bore 6 is indicated by the same reference numberals as those used above, provided with an apostrophe, and thus comprises elements 12'...24'.
  • a piston/piston rod system with the appropriate seals is accommodated in a corresponding way in the cylinder bore 8, and thus fits inside the cylinder barrel 10; it is indicated with corresponding reference numbers provided with a quotation mark, thus 12"...24".
  • the three piston rods 14, 14', 14" are fixed to a common yoke 30 and are fixed with nuts 32, 32', 32".
  • the two switch valves one for component A and the other for component B, whose mode of operation is known per se from FR-A-1,595,934, are formed by two bores 34, 34' formed in the housing below the cylinder bores.
  • a valve plunger 36, 36' is guided in each of them, and each plunger contains two overflow channels 38, 40 and 38', 40' respectively (see also figure 4).
  • Each overflow channel is connected to two transverse channels which interact with inlet and outlet ports formed in the housing and with channels formed in the housing and leading to the cylinder bores, the channels interacting with the inlet and outlet ports IN A, IN B and OUT A, OUT B respectively being indicated by 38a, 38a', 40a, 40a', and those with the channels formed in the housing being indicated by 38b, 38b', 40b and 40b'.
  • the way in which the switch valves work will be explained below with reference to figure 5, although for the person skilled in the art they will be clear without further explanation.
  • this energy storage device is formed by two leaf spring assemblies, placed on either side of the yoke 30, and one of which can be seen in figure 1, indicated there by reference number 50. Each leaf spring assembly is surrounded by two catch pins projecting from the yoke 30, in figure 1 indicated by 52a, 52b for the assembly 50.
  • each leaf spring assembly is accommodated in a spring holder fixed in the housing 2, for assembly 50 indicated by 54.
  • the bottom end (50") of each leaf spring assembly rests in a groove formed in a movable spring holder 56, 56' - see figure 4, in which the respective grooves are indicated by 58, 58'.
  • the spring holders 56, 56' are interconnected by means of the switch plate 60, and said switch plate has locking edges 62a, 62b which interact with blocking edges 64a, 64b formed on a switch cam 66 disposed below the switch plate 60.
  • each of these blocking edges 64a, 64b Connecting to each of these blocking edges 64a, 64b is an upward slanting run-on face 68a, 68b, and each of such faces interacts with a control cam 70a, 70b formed at the bottom end of the yoke 30.
  • the switch cam 66 is provided at the underside with a transverse groove 72, containing a hinge plate 74 which supports the cam and is under the influence of the compression spring 76.
  • the spring holders 56, 56' are connected by means of the screws 61 to the two valve plungers 36, 36'.
  • This switching mechanism works as follows: When the yoke 30, starting from the position shown in figure 1, moves to the right under the influence of medium under pressure present to the left of the pistons 12, 12', 12", the components of the control mechanism of the plungers 36, 36' are in the position shown in figure 1: the switch cam 66 is tilted anti-clockwise, the switch plate 60 lies with the edge 62b thereof against the blocking edge 64b of the switch cam 66, and the two plungers 36, 36' are in their furthest left position. They cannot move to the right now because such a movement is prevented through the fact that the locking edge 62b of the switch plate 60 is lying against the blocking edge 64b.
  • the cam 70b runs against the run-on face 68b of the switch cam 66 and presses this face down, with the result that the blocking edge 64b comes away from the locking edge 62b of the switch plate 60, and the switch plate 60 with the spring holders 56, 56' and the plungers 36, 36' connected thereto is pressed to the right by the bottom ends of the spring assemblies engaging in the recesses 58, 58'.
  • the transverse channel 38a interacts with the inlet for medium A, indicated by IN A, while the transverse channel 40a interacts with the outlet for medium A, indicated by OUT A.
  • the transverse channel 38b interacts with two adjacent bores 80a, 80b formed in the housing, while the transverse channel 40b interacts with two adjacent bores 82a, 82b formed in the housing.
  • the bores 80a and 82b are interconnected by means of a channel 84, while the bore 80b is connected by means of a channel 86 to the bore 82a.
  • the channels 80a and 82b are connected to the space 90 to the left of the piston 12' by means of a channel 88 formed in the housing, while the bores 80b and 82a are connected by means of a channel 92 to the space 94 to the right of the piston 12'.
  • the inlet IN A is connected to the space 90 left of the piston 12', and the space 94 right of said piston is connected by means of the channels 92, 82a, 40b and 40a to OUT A.
  • the piston 12' moves to the right, and the medium present to the right of the piston 94 flows out of the outlet OUT A.
  • the medium inlet IN A is connected by means of the channels 38, 38b, 80b, 86 and 92 to the now virtually empty space 94 to the right of the piston 12', while the space 90 to the left of said piston is completely filled with medium.
  • This space 90 is now connected by means of the channels 88, 84, 82b, 40b, 40 and 40a to OUT A, so that when there is a piston stroke to the left the medium is driven out of the space 90 to the left of the piston 12' and flows out of OUT A.
  • the plunger 36' controlling the flow of medium B operates in a way corresponding to that described above.
  • Figure 6 shows a modification of the above described embodiment.
  • elements corresponding with the ones already desribed before are not provided with reference numerals; only the new elements are indicated with reference numerals.
  • each piston rod 14' is connected to this yoke which, as in the already described embodiment carries the two pins 52a, 52b which couple the yoke to the leaf spring assembly 50.
  • the piston rods 14, 14' each pass freely through the yoke 30.
  • Each piston rod is at its free end connected to a U-shaped extension 100, 100', 100" and the free ends of each extensions carries between them a cylindrical pivot pin 102, 102', 102".
  • Each lever is provided with a longitudinal slot 106, 106'.
  • Each of these slots accommodates a fixed pivot pin 108, 108' respectively which protrudes from a sliding block 110, 110' respectively.
  • Each block slides in a guide way provided in a fixed guide block 112.
  • the slots 106, 106' also accommodate the pivot pins 102, 102' at the ends of the extensions 100, 100' respectively.
  • the blocks 110, 110' are provided with internal screwthread, block 110 with right hand screwthread and block 110' with left hand screw thread into which is screwed the screw spindle 114 with a right hand screw part 114a and the left hand screw part 114b.
  • the spindle can be turned by means of the knob 116.
  • the volume ratio not only depends upon the surface of the respective pistons but can also be adjusted at will within a certain range in dependance upon the position of the pivots 108, 108'.
  • the device according to the invention is excellent for delivering raw materials in a predetermined volume ratio which is necessary for forming polyurethane foam, and can be used on building and construction sites.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Actuator (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Driven Valves (AREA)
EP92202178A 1991-07-16 1992-07-15 Vorrichtung zur Abgabe von mindestens zwei Fluida in einem vorherbestimmten Mengenverhältnis Expired - Lifetime EP0525864B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9101250A NL9101250A (nl) 1991-07-16 1991-07-16 Inrichting voor het met een vooraf bepaalde volumeverhouding afleveren van tenminste twee vloeiende media.
NL9101250 1991-07-16

Publications (2)

Publication Number Publication Date
EP0525864A1 true EP0525864A1 (de) 1993-02-03
EP0525864B1 EP0525864B1 (de) 1995-05-24

Family

ID=19859524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92202178A Expired - Lifetime EP0525864B1 (de) 1991-07-16 1992-07-15 Vorrichtung zur Abgabe von mindestens zwei Fluida in einem vorherbestimmten Mengenverhältnis

Country Status (5)

Country Link
EP (1) EP0525864B1 (de)
AT (1) ATE122925T1 (de)
DE (1) DE69202639T2 (de)
DK (1) DK0525864T3 (de)
NL (1) NL9101250A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1002481C2 (nl) * 1996-02-29 1997-09-01 Unitrans Techniek B V Inrichting en werkwijze voor het doseren van ten minste een medium, in het bijzonder, doch niet uitsluitend een visceus medium.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981240A (en) * 1960-01-29 1961-04-25 Nelson Fluid flow meters
FR1595934A (de) * 1967-12-27 1970-06-15
FR2382680A1 (fr) * 1977-03-02 1978-09-29 Peithmann Kg L Debitmetre pour liquides
GB2200695A (en) * 1987-01-29 1988-08-10 Pa Consulting Services Mixing pump
EP0318596A1 (de) * 1987-06-15 1989-06-07 Yamada Yuki Seizo Co. Ltd. Umstellventil-vorrichtung vom kolbenschiebertyp

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981240A (en) * 1960-01-29 1961-04-25 Nelson Fluid flow meters
FR1595934A (de) * 1967-12-27 1970-06-15
FR2382680A1 (fr) * 1977-03-02 1978-09-29 Peithmann Kg L Debitmetre pour liquides
GB2200695A (en) * 1987-01-29 1988-08-10 Pa Consulting Services Mixing pump
EP0318596A1 (de) * 1987-06-15 1989-06-07 Yamada Yuki Seizo Co. Ltd. Umstellventil-vorrichtung vom kolbenschiebertyp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1002481C2 (nl) * 1996-02-29 1997-09-01 Unitrans Techniek B V Inrichting en werkwijze voor het doseren van ten minste een medium, in het bijzonder, doch niet uitsluitend een visceus medium.
EP0793080A1 (de) 1996-02-29 1997-09-03 Unitrans Techniek B.V. Vorrichtung und Verfahren zur Dosierung von wenigstens einem Medium, insbesondere einem viskösen Medium

Also Published As

Publication number Publication date
DK0525864T3 (da) 1995-10-16
EP0525864B1 (de) 1995-05-24
NL9101250A (nl) 1993-02-16
DE69202639T2 (de) 1996-01-25
DE69202639D1 (de) 1995-06-29
ATE122925T1 (de) 1995-06-15

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