Method for adjusting the volumetric flow ratio of at least two different fluids

Patent metadata

Field	Value
Publication number	US-12055133-B2
Application number	US-201917283008-A
Country	US
Kind code	B2
Filing date	Sep 24, 2019
Priority date	Oct 5, 2018
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

Method for adjusting the volumetric flow ratio of at least two different fluids (F 1 , F 2 ) with a control-device. The control-device comprises a first chamber with a chamber-volume (V C1 ) for the first fluid (F 1 ) and an inlet-element and an outlet-element for the first fluid (F 1 ) and at least one rotating or nutating element. The control-device further comprises at least one second chamber with a chamber-volume (V C2 ) for the second fluid (F 2 ), wherein the second chamber has an inlet-element and an outlet-element for the second fluid (F 2 ) and at least one rotating or nutating element. The rotating or nutating elements are coupled so as to rotate or nutate at a defined rotational or nutational frequency ratio and are driven by the fluids (F 1 , F 2 ). The chamber volume ratio (V C1 :V C2 ) and the rotational or nutational frequency ratio are selected such that the fluids (F 1 , F 2 ) flowing out of the outlet-elements have a predefined volumetric flow ratio. The input resistor (R i ) of the respective inlet-element and the output resistor (R o ) of the respective outlet-element of the first chamber and/or the second chamber are chosen so as to satisfy the equation: (I), wherein η F is the viscosity of the respective fluid (F 1 , F 2 ) and Cn designates the respective chamber.

First claim

The invention claimed is:

1. A method for adjusting the volumetric flow ratio of at least two different fluids F 1 , F 2 , wherein the volumetric flow ratio between the fluids F 1 , F 2 is adjusted with a control-device, comprising
a first chamber with a chamber-volume V C1 for the first fluid F 1 , wherein the first chamber has an inlet-element and an outlet-element for the first fluid and at least one rotating or nutating element inside the chamber,
at least one second chamber with a chamber-volume V C2 for the at least one second fluid F 2 , wherein the second chamber has an inlet-element and an outlet-element for the second fluid and at least one rotating or nutating element inside the chamber,

wherein the at least one rotating or nutating element of the first chamber and the at least one rotating or nutating element of the second chamber are coupled so as to rotate or nutate at a defined rotational or nutational frequency ratio,
wherein the at least one rotating or nutating element of the first chamber or the at least one rotating or nutating element of the second chamber are/is driven by the first fluid F 1 and/or the second fluid F 2 ,
wherein the chamber volume ratio VC1:VC2 and the rotational or nutational frequency ratio are selected such that the first fluid flowing out of the outlet-element of the first chamber and the second fluid flowing out of the outlet-element of the second chamber have a predefined volumetric flow ratio
and wherein the input resistor R i of the respective inlet-element and the output resistor R o of the respective outlet-element of the first chamber and/or the second chamber are chosen so as to satisfy the equation:

R

i
⁢
C
⁢
n

+

R

o
⁢
C
⁢
n

η
F

=

R
T

≤

1
⁢

0

1
⁢
4

⁢

⁢

m

-
3

,

wherein η F is the viscosity of the respective fluid F 1 , F 2 and Cn designates the respective chamber.

2. The method according to claim 1 wherein the input resistor R i of the respective inlet-element and the output resistor R o of the respective outlet-element of the first chamber and/or the second chamber are chosen so that R T is 10 4 m −3 to 10 14 m −3 .

3. The method according to claim 1 , wherein the at least one rotating or nutating element of the first chamber and the at least one rotating or nutating element of the second chamber are coupled directly so as to rotate at an identical rotational or nutational frequency, so that the volumetric flow ratio between the first fluid and the second fluid is equal to the defined volume ratio of the first and the second chamber V C1 :V C2 .

4. The method according to claim 1 , wherein the first chamber and/or the second chamber have a first rotating element and a second counter-rotating element wherein the rotational frequency ratio between the first rotating elements and/or the rotational frequency ratio between the second counter-rotating elements equals 1.

5. The method according to claim 1 , wherein the viscosity n of the first fluid F 1 and/or of the second fluid F 2 is 0.5 mPa·s to 10,000 mPa·s.

6. The method according to claim 1 , wherein the ratio of the chamber volume V C1 of the first chamber and the chamber volume V C2 of the second chamber is 1 to 100.

7. The method according to claim 1 , wherein the ratio of the pressure difference Δp 1 between the inlet-element and the outlet-element of the first chamber and the pressure difference Δp 2 between the inlet-element and the outlet-element of the second chamber is less than 1500.

8. The method according to claim 1 , wherein the ratio of the R T(C1) -value of the first chamber and the R T(C2) -value of the second chamber is less than 1500.

9. The method according to claim 1 , wherein the first fluid F 1 and the second fluid F 2 are selected so as to chemically react upon mixing and wherein at least one of the fluids F 1 , F 2 comprises at least one polyurethane.

10. The method according to claim 1 , wherein at least one of the fluids F 1 , F 2 comprises at least one buffer.

11. The method according to claim 1 , wherein the ratio of the R T(C1) -value of the first chamber to the leakage-resistor R L(C1) of the first chamber and/or the ratio of the R T(C2) -value of the second chamber to the leakage-resistor R L(C2) ) of the second chamber is between 10 −8 and 10 4 .

12. The method according to claim 1 , wherein the ratio of the flow volume ratio without rotating or nutating elements FR 0 to the theoretical flow volume ratio FR T is between 0.01 and 100.

13. A control-device for adjusting the volumetric flow ratio of at least two different fluids F 1 , F 2 comprising:
a first chamber with a chamber volume V C1 for the first fluid F 1 , wherein the first chamber has an inlet-element and an outlet-element for the first fluid F 1 and at least one rotating or nutating element inside the chamber,
at least one second chamber with a chamber-volume V C2 for the at least one second fluid F 2 , wherein the second chamber has an inlet-element and an outlet-element for the second fluid F 2 and at least one rotating or nutating element inside the chamber, and wherein the at least one rotating or nutating element of the first chamber and the at least one rotating or nutating element of the second chamber are coupled so as to rotate or nutate at a defined rotational or nutational frequency ratio,
wherein the at least one rotating or nutating element of the first chamber and/or the at least one rotating or nutating element of the second chamber are/is driven by the first fluid F 1 and/or the second fluid F 2 ,
wherein the chamber volume ratio VC1:VC2 and the rotational or nutational frequency ratio are selected such that the first fluid flowing out of the outlet-element of the first chamber and the second fluid flowing out of the outlet-element of the second chamber have a predefined volumetric flow ratio
and wherein the input resistor R i of the respective inlet-element and the output resistor R o of the respective outlet-element of the first chamber and/or the second chamber are chosen so as to satisfy the equation:

Assignees

• Covestro Intellectual Property Gmbh & Co Kg

Inventors

• Suetterlin Jan
• Honour Andy
• Motley Jeff

Classifications

• G05D11/03

  without auxiliary power · CPC title

• G05D11/005

  using synchronised pumps · CPC title

• G01F13/00 Primary

  Apparatus for measuring by volume and delivering fluids or fluent solid materials, not provided for in the preceding groups · CPC title

• G01F3/12

  Meters with nutating members, e.g. discs · CPC title

• G01F3/10

  Geared or lobed impeller meters · CPC title