Liquid delivery system

Information

  • Patent Grant
  • 9499390
  • Patent Number
    9,499,390
  • Date Filed
    Wednesday, May 29, 2013
    11 years ago
  • Date Issued
    Tuesday, November 22, 2016
    8 years ago
Abstract
A system for the on demand delivery of a liquid mixture to an on/off dispenser comprises a mixing chamber having first and second inlets and an outlet connected to the dispenser. A first constant flow valve has a first outlet connected to the first inlet via a first supply line. The first constant flow valve is adapted to deliver a first liquid to the mixing chamber at a first substantially constant pressure. A second constant flow valve has a second outlet connected to the second inlet via a second supply line. The size of the second inlet is at least as large as the size of the second outlet. The second constant flow valve is adapted to deliver a second liquid to the mixing chamber at a second pressure greater than the first pressure, with the second pressure being determined primarily by the flow resistance of the second supply line. At least one of the first and second liquids, or a third liquid delivered to the mixing chamber via a third supply line, may be atomized. Compressed air may be introduced into the mixing chamber to enhance liquid mixing.
Description
BACKGROUND

1. Field of the Invention


This invention relates generally to liquid delivery systems, and is concerned in particular with the on demand mixture and constant flow delivery of multiple liquids, some of which may have elevated viscosities and/or levels of suspended solids, and others of which may require delivery at extremely high ratios.


2. Description of Related Art


As herein employed, the term “on demand” means a system in which the mixture of liquid components occurs in response to and simultaneously with delivery of the resulting mixture.


With reference to FIG. 1, a prior on demand liquid mixing and delivery system is generally depicted at 10 and includes a mixing chamber 12. A first liquid component, which may for example be water received via a conduit 13 from a municipal water source, is supplied to the mixing chamber via a first supply line 14. The first supply line includes a first constant flow valve 16, a downstream metering orifice 18 and an optional check valve 20.


As herein employed, the term “constant flow valve” means a flow control valve of the type described, for example, in any one of U.S. Pat. Nos. 7,617,839; 6,026,850 or 6,209,578, the descriptions of which are herein incorporated by reference in their entirety.


These types of valves are normally closed, are opened in response to pressures exceeding a lower threshold level, are operative at pressures between the lower threshold level and an upper threshold level to deliver liquids at a substantially constant pressures, and are again closed at pressures above the upper threshold level.


A second liquid component, e.g., a tea concentrate, is received via conduit 22 and is supplied to the mixing chamber 12 via a second supply line 24. Conduit 22 is connected to a pressurized source of the second liquid component, one non limiting example being a pump 26, which may be driven by compressed air received via conduit 27. The second supply line includes a second constant flow valve 28, a downstream second metering orifice 30 having a fixed size, and another optional check valve 32. The first and second constant flow valves 16, 28 serve to deliver the first and second liquid components to the mixing chamber 12 at substantially constant pressures, irrespective of variations in the input pressures in the conduits 13, 22 between the upper and lower threshold levels of the valves, and at substantially constant flow rates governed by the flow resistances of the first and second metering orifices 18, 30.


The first and second liquid components are combined in the mixing chamber to produce a liquid mixture having a mix ratio governed by the selected variable size of the first metering orifice 18 and the fixed size of the second metering orifice 30.


Although not shown, it will be understood that the locations of the first and second metering orifices 18, 30 may be reversed, with the adjustable metering orifice 18 being located in the second supply line 24 and the fixed metering 30 orifice being located in the first supply line 14. Alternatively, the first and second supply lines 14, 24 may both be equipped with either fixed or adjustable orifices.


A discharge line 34 leads from the mixing chamber 12 and through which the liquid mixture is delivered to an on/off dispenser 36. A third metering orifice 38 is provided in the discharge line 34. As shown, the third metering orifice is upstream and separate from the dispenser 36. Alternatively, the third metering orifice may be included as an integral component of the dispenser.


When the dispenser is open, the discharge line 34 has a maximum flow rate that is lower than the combined minimum flow rates of the first and second supply lines 14, 24, thus creating back pressures in the first and second supply lines downstream of their respective constant flow valves 16, 28. These back pressures, together with the inlet pressures applied to the constant flow valves, maintain the constant flow valves open, thereby delivering the first and second liquid components to the mixing chamber at substantially constant pressures and flow rates.


For many applications, the above described system operates in a generally satisfactory manner, although there are certain applications that can be potentially problematic. For example, when the second liquid component has an elevated viscosity and/or level of suspended solids, and the ratio of the first liquid to the second liquid is relatively high, e.g., 400:1 there is a danger that the metering orifice 30 in the second supply line 24 will become plugged, necessitating a shut down of the system while the metering orifice is either cleaned or replaced. Such maintenance procedures are both disruptive and costly.


Even when the second liquid has a relatively low viscosity and has little if any suspended solids, its mixture with the first liquid at extremely high ratios on the order of 1000:1 can be difficult if not impossible to achieve due to limitations imposed by the metering orifices.


Also, for certain liquid combinations, adequate mixture in the mixing chamber 12 may be difficult to achieve, resulting in a less than a homogeneous mixture being delivered to the dispensing valve.


SUMMARY OF THE INVENTION

Broadly stated, the objective of the present invention is to provide an improved on demand liquid mixing and delivery system which addresses each of the above described shortcomings of the prior liquid delivery system.


In accordance with one aspect of the present invention, an on demand liquid mixing and delivery system comprises a manifold defining a mixing chamber. The manifold has first and second inlets communicating with the mixing chamber, and an outlet connected to an on/off dispenser. A first constant flow valve has a first outlet connected to the first manifold inlet via a first supply line. The first constant flow valve is adapted to deliver a first liquid to the mixing chamber at a substantially constant first pressure. A second constant flow valve has a second outlet connected to the second manifold inlet via a second supply line. The size of the second manifold inlet is at least as large as the size of the second outlet. The second constant flow valve is adapted to deliver a second liquid to the mixing chamber at a substantially constant second pressure greater than the first pressure.


The second supply conduit lacks any metering orifice. Instead, flow resistance in the second conduit is provided primarily by the length and/or internal size of at least a section of the second conduit, with that section advantageously being readily interchangeable with other sections having different lengths and/or internal sizes selected to provide flow resistances suitable for fluids having different viscosities and/or levels of suspended solids.


According to another aspect of the present invention, extremely high ratios can be achieved by atomizing one or more of the liquid components of the liquid mixture being delivered to the dispenser.


According to still another aspect of the present invention, mixture of the liquid components may be enhanced by the introduction of pressurized air into the mixing chamber.


These and other objectives, features and advantages of the present invention will now be described in greater detail with reference to the accompanying drawings, wherein:





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1 is a diagrammatic illustration of a prior liquid delivery system;



FIG. 2 is a diagrammatic illustration of a liquid delivery system in accordance with an exemplary embodiment of the present invention; and



FIG. 3 is a diagrammatic illustration of an alternative manner of incorporating atomized liquid into the liquid mixture being delivered to the dispenser.





DETAILED DESCRIPTION

An exemplary embodiment of an on demand liquid mixing and delivery system embodying aspects of the present invention is depicted at 40 in FIG. 2. The same reference numbers have been employed to designate components of the system 40 that are similar or identical to those of the prior system 10 illustrated in FIG. 1.


The mixing chamber 12 has first and second inlets 12a, 12b and an outlet 12c. The first constant flow valve 16 has a first outlet 16a connected by supply line 14 to the first inlet 12a. The first constant flow valve 16 is adapted to deliver a first liquid to the mixing chamber 12 at a first pressure.


Similarly, the second constant flow valve 28 has a second outlet 28a connected by supply line 24 to the second inlet 12b. The second constant flow valve 28 is adapted to deliver a second liquid to the mixing chamber at a second pressure that is greater than the first delivery pressure of the first constant flow valve. The size of the second inlet 12b is at least as large as the second constant flow valve outlet 28a.


According to one aspect of the present invention, the second supply line 24 lacks any metering orifice. Instead, flow resistance to the second liquid being delivered to the mixing chamber is provided exclusively by the second supply line, and primarily by the length and/or internal size of at least one conduit section 42 of the second supply line. Advantageously, quick disconnect couplings 44 allow the conduit section 42 to be readily interchanged with other conduit sections having different lengths and/or internal sizes selected to provide different flow resistances suitable for liquids having different viscosities and/or levels of suspended solids. In comparison to conventional orifices, the conduit sections 42 are far less prone to plugging, and thus contribute advantageously to trouble free operation of the liquid delivery system.


According to another aspect of the present invention, an atomized third liquid is incorporated into the liquid mixture being delivered to the dispenser 36. Atomization may be achieved by compressed air received via conduit 46 and fed through a third constant flow valve 48 connected to the mixing chamber 12 by a third supply line 50.


The third supply line includes a check valve 52 and an atomizer 54, one non-limiting example being a Micro Mist Nebulizer available online at justnebulizers.com. The third liquid is drawn by the atomizer 54 from a container 56 and directed through a third metering orifice 58 and into mixing chamber 12 where it is combined with the first and second liquids.


Alternatively, as depicted in FIG. 3, the third supply line 50 may bypass the mixing chamber 12 and may be connected to the discharge line 34.


According to still another aspect of the present invention, in order to enhance the mixture of liquids in the mixing chamber 12, compressed air received via conduit 60 and a fourth constant flow valve 62 may be introduced into the mixing chamber 12 via a fourth supply line 64 including a check valve 66 and a fourth metering orifice 68.


A typical non-limiting example of the use to which the above described system may be put is the on demand dispensing of tea at rates of between 1.0 and 2.0 oz/sec., where the mixture being fed to the on/off dispenser 36 includes water delivered to the mixing chamber 12 via supply line 14, a tea concentrate delivered via supply line 24, and an essense to enhance the tea aroma of the dispensed mixture delivered via supply line 50.


When dispensing the tea mixture at a rate of about 1.5 oz/sec., exemplary ratios of water to tea concentrate may range between 11/1 and 5/1, with the essence contributing about 0.001% of the mixture being provided to the dispenser. If enhanced mixing is required, compressed air at about 14.5 p.s.i may be introduced into the mixing chamber 12.


When the dispenser 36 is closed, back pressures in the supply lines 14, 24, 50 and 64 increase and contribute to a rise in the operating pressures of the constant flow valves 16, 28, 48 and 62 above their respective upper threshold levels, causing the valves to close. When the dispenser is opened, back pressures drop to levels permitting the constant flow valves to open and operate between their respective upper and lower threshold levels.

Claims
  • 1. A system for the on demand delivery of a liquid mixture to an on/off dispenser, said system comprising: a mixing chamber having first and second inlets and an outlet connected to said dispenser;a first constant flow valve having a first outlet connected to said first inlet via a first supply line, said first constant flow valve being adapted to deliver a first liquid to said mixing chamber at a first substantially constant pressure; anda second constant flow valve having a second outlet, the size of said second inlet being at least as large as the size of said second outlet, a second supply line having an entry end and an exit end connected to said second inlet, said second constant flow valve being adapted to deliver a second liquid via said second supply line to said mixing chamber at a second pressure greater than said first pressure, said second supply line lacking any metering orifice between its entry and exit ends, with resistance to flow of said second liquid from said second outlet to said second inlet being provided primarily by the length and/or size of at least one conduit section of said second supply line between said entry and exit ends, said first and second liquids being combined in said mixing chamber for delivery as said liquid mixture via the outlet of said mixing chamber to said on/off dispenser;wherein the flow resistance of said second supply line is provided primarily by the internal size of a conduit section of said second supply line;wherein said conduit section is removable from said second supply line and readily interchangeable with other conduit sections having different lengths and/or internal sizes.
  • 2. The system of claim 1 further comprising atomizing means for incorporating an atomized liquid into said liquid mixture.
  • 3. The system of claim 2 wherein said atomized liquid is incorporated into said liquid mixture in said mixing chamber.
  • 4. The system of claim 2 wherein said atomized liquid is incorporated into said liquid mixture in a discharge line.
  • 5. The system of claim 1 further comprising means for introducing a pressurized gas into said mixing chamber to promote turbulence and enhance the mixture of said first and second liquid.
CROSS REFERENCE TO RELATED APPLICATIONS

This application claims benefit, under 35 U.S.C. §119(e), of U.S. Provisional Application Ser. No. 61/672,465 filed on Jul. 17, 2012, and U.S. Utility application Ser. No. 13/681,601 filed Nov. 20, 2012, the contents and substance of which are herein incorporated by reference.

US Referenced Citations (94)
Number Name Date Kind
1948401 Smith et al. Feb 1934 A
2504117 Downs Apr 1950 A
2513081 Clark et al. Jun 1950 A
2755979 Lawson et al. Jul 1956 A
2986306 Cocanour May 1961 A
3049439 Coffman Aug 1962 A
3093311 Morris et al. Jun 1963 A
3179341 Plos et al. Apr 1965 A
3198394 Lefer Aug 1965 A
3306495 Wabers Feb 1967 A
3403695 Hopkins Oct 1968 A
3588053 Rothermel Jun 1971 A
3592385 Smith Jul 1971 A
3596802 Feldman Aug 1971 A
4006841 Alticosalian Feb 1977 A
4062220 Taube et al. Dec 1977 A
4090262 Schneider et al. May 1978 A
4111613 Sperry Sep 1978 A
4159028 Barker et al. Jun 1979 A
4173296 Marshall Nov 1979 A
RE30301 Zygiel Jun 1980 E
4390035 Hill Jun 1983 A
4549674 Alticosalian Oct 1985 A
4714545 Bente et al. Dec 1987 A
4789100 Senf Dec 1988 A
4809909 Kukesh Mar 1989 A
4964732 Cadeo et al. Oct 1990 A
4979644 Meyer et al. Dec 1990 A
5016665 Konieczynski May 1991 A
5058610 Kuriyama Oct 1991 A
5064100 Mural Nov 1991 A
5152431 Gardner et al. Oct 1992 A
5219097 Huber et al. Jun 1993 A
5292030 Kateman et al. Mar 1994 A
5388761 Langeman Feb 1995 A
5398846 Corba et al. Mar 1995 A
5405083 Moses Apr 1995 A
5662922 Christensen Sep 1997 A
5685639 Green Nov 1997 A
5741554 Tisone Apr 1998 A
5803109 Rosen Sep 1998 A
5810254 Kropfield Sep 1998 A
5868279 Powell Feb 1999 A
5887755 Hood, III Mar 1999 A
6026850 Newton et al. Feb 2000 A
6116261 Rosen Sep 2000 A
6173862 Buca et al. Jan 2001 B1
6209578 Newton Apr 2001 B1
6223788 Taylor May 2001 B1
6283329 Bezaire et al. Sep 2001 B1
6315161 Bezaire et al. Nov 2001 B1
6533189 Kott et al. Mar 2003 B2
6554207 Ebberts Apr 2003 B2
6793098 Huber et al. Sep 2004 B2
6988641 Jones et al. Jan 2006 B2
7036686 Newton May 2006 B2
7066215 Hewlitt et al. Jun 2006 B1
7311225 Newton Dec 2007 B2
7338557 Chen et al. Mar 2008 B1
7341630 Pacetti Mar 2008 B1
7363938 Newton Apr 2008 B1
7395948 Kogan Jul 2008 B2
7445021 Newton Nov 2008 B2
7533786 Woolfson et al. May 2009 B2
7617839 Newton Nov 2009 B2
7775401 Banco et al. Aug 2010 B2
7775745 Simmons et al. Aug 2010 B2
7819289 Willis Oct 2010 B2
7875001 Minotti Jan 2011 B2
8002151 Matthews et al. Aug 2011 B2
8100347 Nabeshima Jan 2012 B2
8342372 Choiniere Jan 2013 B2
8540120 Newton et al. Sep 2013 B2
8596498 Werner et al. Dec 2013 B2
8641662 Barker, Jr. Feb 2014 B2
20020170925 Friedman Nov 2002 A1
20030075573 Bailey Apr 2003 A1
20030196595 Takeshita et al. Oct 2003 A1
20040060946 Floyd et al. Apr 2004 A1
20040144802 Newton Jul 2004 A1
20040240311 Hashiba Dec 2004 A1
20050103889 Langeman May 2005 A1
20050155984 Newton Jul 2005 A1
20060011655 Ophardt Jan 2006 A1
20070000947 Lewis et al. Jan 2007 A1
20070129680 Hagg et al. Jun 2007 A1
20080094935 Newton et al. Apr 2008 A1
20090152298 Woolfson et al. Jun 2009 A1
20110121034 Swab et al. May 2011 A1
20110259919 Choiniere et al. Oct 2011 A1
20120113744 Malboeuf May 2012 A1
20120275867 Jones Nov 2012 A1
20120279990 Werner Nov 2012 A1
20130056493 Newton et al. Mar 2013 A1
Foreign Referenced Citations (5)
Number Date Country
1738764 Feb 2006 CN
1744953 Mar 2006 CN
101370412 Feb 2009 CN
0226614 Apr 2002 WO
2007120052 Oct 2007 WO
Non-Patent Literature Citations (7)
Entry
Orifice—Definitiona nd More from the Free Merriam-Webster Dictionary.pdf.
International Search Report and Written Opinion mailed on Dec. 3, 2013 in connection with International Application PCT/US2013/049537, 11 pages.
International Preliminary Report on Patentability issued in PCT Application No. PCT/US2013/049537 Jan. 29, 2015.
EP partial search report issued in connection with corresponding EP application No. 1381999 mailed on Jan. 27, 2016.
The Chinese Office Action issued in connection with corresponding Chinese Application No. 201380037422.X issued on Feb. 29, 2016 and English translation thereof.
The Chinese Search Report issued in connection with corresponding Chinese Application No. 201380037422.X and English translation thereof.
Extended European Search Report issued in EP Application No. 13819995.5 Jun. 28, 2016.
Provisional Applications (1)
Number Date Country
61672465 Jul 2012 US
Continuations (1)
Number Date Country
Parent 13681601 Nov 2012 US
Child 13904532 US