Title of Invention

A FLUID OVERFLOW PREVENTION SYSTEM FOR POSITIVE DISPLACEMENT PUMPS

Abstract

A fluid overflow prevention system for positive displacement pump/s that has provision for separation of gaseous elements in the fluid comprising a non-pressurized chamber that contains non-pressurized fluid wherein the said chamber comprises of: first conduit connected to the pressurized chamber for fluid inlet; an assembly of first floating device and a valve adapted to fit on a second conduit that is connected to the suction port of the pump wherein relative displacement of the said floating device with respect to the volume of the fluid in the said chamber actuates the said valve to control fluid flow to the said suction port of the pump wherein diameter of the said first conduit is greater than that of the second conduit; fluid inlet provision for the said non-pressurised chamber to admit the fluid stream discharged from the pressurized chamber of the pump, gaseous component inlet provision in connection with the gaseous component separation chamber of the pump to admit separated gaseous components; gaseous components vent provision; a valve system adapted to fit in the said non-pressurized chamber wherein the valve system comprises of: a slidable second floating device that is mounted on a vertical cylinder like provision wherein the said floating device slides vertically on the said provision, oil seal provided on the top of the said floating device, a valve disposed at the inlet of the said gaseous components vent provision and at the top of the said slidable floating device such as to close the said gaseous components vent provision upon vertically upward sliding of the said floating device; wherein the said slidable floating device gets lifted as the said non-pressurized chamber gets filled up with fluid, thus operating the said valve to close the gaseous vent port preventing fluid overflow.

Full Text

FORM - 2 THE PATENTS ACT, 1970 (39 OF 1970) COMPLETE SPECIFICATION (See Section 10) TITLE OF INVENTION "Device for Prevention of Fluid Overflow in Positive Displacement Pumps Having Provision for Gaseous Components Separation" M IDCO Limited having office at (a) Metro Estate, Vidyanagari Marg, Kalina, Mumbai 4000 98 The following specification particularly describes the nature of the invention and the manner in which it is to be performed. Field of the Invention The present invention relates to fluid overflow prevention system capable of being integrated with positive displacement pump/s that has provision for separation of gaseous elements in the fluid. In particular the invention relates to a fuel pump integrated with the system to prevent fluid overflow along with a system to separate gaseous efement from a fuel. Background of the Invention Typically in the pumps that are provided with gaseous component / air separation provision, a secondary non-pressurized zone is provided. This zone is in connection with the pressurized zone for liquid / fuel / fuel gaseous element inlet for fuel outlet of the pump and suction port. If the rate of flow of fuel from the pressurized zone is more than that of the outflow to the pump suction, there is a danger of flooding of the non-pressurized zone wherein the fluid oozes out of the air vent creating a harmful atmosphere. As a matter of fact if the closed system like the pumping unit has any opening to the atmosphere then there is a chance of fluid oozing out. In the case of the positive displacement pump in question the air vent provides a similar opening. Various attempts to overcome this problem are reported in the literature, they are as follows: United States Patent 5884809 discloses air separating fuel dispensing system wherein the system includes an above-tank suction pump which draws fuel from the tank. The fuel is discharged from the suction pump into a vertically aligned air separator so as to produce a fuel stream that is substantially free of air. The fuel stream is discharged from the air separator to a flow meter and the nozzle through a fuel shutoff valve. The open/closed state of the fuel shutoff valve is controlled by a control actuator based on the differential processor across the air separator. Should this differential pressure drop below a given level, the fuel shutoff valve is closed to prevent the system from inadvertently supply a fuel stream with an unacceptably high air content. Gaseous fluid removed by the air separator is supplied to an air eliminator. The fuel components of this fluid stream are removed in the air eliminator and returned to the suction pump. However, an integrated system to prevent fluid overflow is not reported . Patent number: WO/1998/050303 discloses air separating fuel dispensing system. The system includes an above-tank suction pump which draws fuel from the tank. The fuel is discharged from the suction pump into a vertically aligned air separator so as to produce a fuel stream that is substantially free of air. The fuel stream is discharged from the air separator to a flow meter and the nozzle through a fuel shutoff valve. The open/closed state of the fuel shutoff valve is controlled by a control actuator based on the differential pressure across the fuel shutoff valve. Should this differential pressure drop below a given level, the fuel shutoff valve is closed to prevent the system from inadvertently supplying a fuel stream with unacceptably high air content. Gaseous fluid removed by the air separator is supplied to an air eliminator. The fuel components of this fluid stream are removed in the air eliminator and returned to the suction pump. European Patent EP0357513 discloses fuel dispenser with a device for controlling. It comprises of a pump for retail delivery wherein the fuel is degassed by means of a vortex device. A control valve shuts off delivery if the gas content in the degassed liquid being delivered via a main duct is too high. Unlike prior systems which sense gas content only in the liquid being delivered, the present invention senses the greater gas content in the recycled gas-enriched fraction from the vortex separator device. This is done by means of a venturi system controlling a servo-valve which in turn controls the control valve. By using a magnified image of the gas content, the system is made more sensitive and more reliable. However this system does not have fuel overflow prevention system that works in tandem with gas separator. United States Patent 6748982 discloses Integrated fuel delivery and vapor recovery system for a fuel dispenser. The apparatus includes a fuel dispenser having a member constructed from extruded material connected to the fuel dispenser. The member has at least one fluid conduit located inside the member for transporting fluid. The member also has a vapor conduit located inside the member for transporting vapor. United States Patent 6290760 discloses air separator system An apparatus and method for separating dissolved gasses from a fluid to produce de-aerated fluid which includes a fluid pump, a gas separator, and a vacuum pump for removing liberated dissolved gasses from the gas separator, in one particular embodiment, a unified pump/meter unit is used to both pump fluid, as well as volumetrically measure the amount of de-aerated fluid pumped. However this system is installed at the inlet of the pump and is not integrated with the pump. The system is bulky. Patent Number GB967106 discloses improvements relating to liquid fuel dispensing apparatus in which two liquids are mixed in variable proportions or supplied separately by adjustment of variable gearing at connecting the outputs of two meters has one grade of liquid e.g. petrol from motor driven pump and air separator supplied to both meters, and a second liquid, e.g. oil, is pumped into the supply to one meter in a predetermined fixed proportion to the petrol supplied thereto. The fixed proportion of oil is produced by a meter driven by gearing from the output of meter. United States Patent 6290760 discloses air separator system for separating dissolved gasses from a fluid to produce de-aerated fluid which includes a fluid pump, a gas separator, and a vacuum pump for removing liberated dissolved gasses from the gas separator. In one particular embodiment, a unified pump/meter unit is used to both pump fluid, as well as volumetrically measure the amount of de-aerated fluid pumped. European Patent EP1189832 discloses system and method for deaerating and dispensing liquid fuel. As disclosed in publication number WO0076910 it discloses a system for monitoring the quantity of air in a liquid-state fuel stream discharged from a dispenser. The dispenser includes a pump that draws the fuel from a storage tank. The fuel stream discharged from the pump is applied to an air separator in which the air and vapor-state fluids are removed from the fuel stream. The gas-removed fuel stream is allowed to flow to nozzle for dispensing. The gas stream created by the air separator is flowed to an air elimination chamber. The fuel in the gas stream separates from the air in the air elimination chamber and is returned to an input side of the pump. The air in the air elimination chamber is vented through a fixed opening to the ambient environment. The monitoring system includes a transducer that monitors the rate ot air flow through the air elimination chamber. This monitoring may be performed by monitoring the air pressure in the chamber upstream of an orifice through which the air is vented to atmosphere. If the air flow rate is greater than a set level, the system closes a valve that regulates fuel flow to the nozzle. Thus, this system prevents fuel that contains an excessive quantity of gaseous-state fluids from being dispensed. Patent number KR20020070753 discloses pump unit integrated with flow meter wherein a pump and the flow meter are incorporated in a casing wherein a channel which connects the pump and the flow meter is formed on the casing. An air separator and a Strainer on the discharging side are provided on the channel. Thus the study of the related prior art reveals a major technological gaps such as lack of fluid overflow prevention system integrated with pump and gaseous element separation systems of the pumps. Necessity has constantly been felt to develop a fluid overflow prevention system that can be integrated with pump that has provision for separation of gaseous elements in the fluid and works in tandem with the gaseous element separation system to avoid fluid overflow through vent to atmosphere. SUMMARY OF THE INVENTION The main object of the invention is to provide a fluid overflow prevention system capable of being integrated with pump having provision for separation of gaseous elements in the fluid- Another object of the invention is to provide fluid overflow prevention system in the non-pressurized zone of the pump. Yet another object of the invention is to provide self actuating fluid overflow prevention system in the pump. Thus in accordance with this invention, the system comprises of: a non-pressurized chamber that contains non-pressurized fluid wherein the said chamber comprises of: first conduit connected to the pressurized chamber; an assembly of first floating device and a valve adapted to fit on a second conduit that is connected to the suction port of the pump wherein relative displacement of the said floating device with respect to the volume of the fluid in the said chamber actuates the said valve to control fluid flow to the said suction port of the pump wherein diameter of the said first conduit is greater than that of the second conduit; fluid inlet provision for the said non-pressurized chamber to admit the fluid stream discharged from the pressurized chamber of the pump, gaseous component inlet provision in connection with the gaseous component separation chamber of the pump to admit separated gaseous components; gaseous components vent provision; a valve system adapted to fit in the said non-pressurized chamber wherein the valve system comprises of: a slidable second floating device that is mounted on a vertical cylinder like provision wherein the said floating device slides vertically on the said provision, oil seal provided on the top of the said floating device, a valve disposed at the inlet of the said gaseous components vent provision and at the top of the said slidable floating device such as to close the said gaseous components vent provision upon vertically upward sliding of the said floating device; wherein the said slidable floating device gets lifted as the said non-pressurized chamber gets filled up with fluid, thus operating the said valve to dose the gaseous vent port preventing fluid overflow. DESCRIPTION OF THE INVENTION Features and advantages of this invention will become apparent in the following detailed description and the preferred embodiments with reference to the accompanying drawings. Figure 1 Schematic of the system (Sheet 1) Figure 2 Schematic of the valve (Sheet 2) Figure 1 depicts a block diagram of the system layout. The system comprises of a non-pressurized chamber 1, first conduit 5 to admit the fluid stream discharged from the pressurized chamber (not shown) wherein gaseous components are separated, gaseous component inlet provision 7 in connection with the gaseous component separation chamber to admit separated gaseous components; gaseous vent provision 2; an assembly of first floating device 12 connected through links 11 to a valve 10 adapted to fit on a second conduit 6 that is connected to the suction port of the pump wherein relative displacement of the said floating device as shown by arrow 9 with respect to the fluid level indicated by 13 and thereby volume of the fluid in the said chamber actuates the said valve to control fluid flow to the said suction port of the pump wherein diameter of the said first conduit is greater than that of the second conduit. The valve system comprising an inverted cup shaped floating device assembly 7 is adapted to fit on a provision (not shown) wherein the said floating device slides vertically (direction indicated by 8) on the said provision, oil seal provided on the top of the inverted U shaped floating device. A valve 4 is disposed at the inlet of the said gaseous vent provision 2 and over the said floating device 7 such as to close the said gaseous provision upon sliding of the said floating device. Upon filling up of the said chamber 1 by fluid entering from 5, the said floatation device gets lifted sliding vertically and operates the valve to close the gaseous vent port preventing fluid overflow. Figure 2 depicts details of the valve. It comprises of the floating device 7 in the form of inverted cup as shown in the figure. This floating device is disposed on a rod 8 such that the said inverted cup slides vertically on the said rod. Further, the said rod is provided with T guide rod 9. Oil seal 10 is provided at the top surface of the said floating device 7 as shown in the figure. In one of the embodiment the fluid is selected from fuels such as petrol, diesel etc. In yet another embodiment the said first floating device is in the form of hollow cylindrical like structure provided with a mounting means at one of the ends wherein a part of the curved surface near other end of the said cylinder is flattened. In another embodiment the said fluid overflow prevention system is integrated with a fuel pump that has gaseous element separation provision. Thus it is evident that the judicious combination and disposition of the slidable floating device and valve system configured with the gaseous vent provision working in conjunction with the amount of fluid that is admitted from the pressurized chamber including gaseous component separation provision results in overcoming the problems of fluid overflow through the vent. A fluid overflow prevention system for positive displacement pump/s that has provision for separation of gaseous elements in the fluid comprising a non-pressurized chamber that contains non-pressurized fluid wherein the said chamber comprises of: first conduit connected to the pressurized chamber for fluid inlet; an assembly of first floating device and a valve adapted to fit on a second conduit that is connected to the suction port of the pump wherein relative displacement of the said floating device with respect to the volume of the fluid in the said chamber actuates the said valve to control fluid flow to the said suction port of the pump wherein diameter of the said first conduit is greater than that of the second conduit; fluid inlet provision for the said non-pressurised chamber to admit the fluid stream discharged from the pressurized chamber of the pump, gaseous component inlet provision in connection with the gaseous component separation chamber of the pump to admit separated gaseous components; gaseous components vent provision; a valve system adapted to fit in the said non-pressurized chamber wherein the valve system comprises of: a slidable second floating device that is mounted on a vertical cylinder like provision wherein the said floating device slides vertically on the said provision, oil seal provided on the top of the said floating device, a valve disposed at the inlet of the said gaseous components vent provision and at the top of the said slidable floating device such as to close the said gaseous components vent provision upon vertically upward sliding of the said floating device; wherein the said slidable floating device gets lifted as the said non-pressurized chamber gets filled up with fluid, thus operating the said valve to close the gaseous vent port preventing fluid overflow. 2. A fluid overflow prevention system for positive displacement pump/s that has provision for separation of gaseous elements as claimed in claim 1 wherein fluid is selected from fuels such as petrol, diesel. 3. A fluid overflow prevention system for positive displacement pump/s that has provision for separation of gaseous elements as claimed in claim 1 wherein the said slidable second floating device is in the form of a inverted cup. 4. A fluid overflow prevention system for positive displacement pump/s that has provision for separation of gaseous elements as claimed in claim 1 wherein the said fluid overflow prevention system is integrated with a fuel pump that has gaseous element separation provision. 5. A fluid overflow prevention system for positive displacement pump/s as claimed in claim 1 wherein the said slidable second floating device is made up of delrin. 6. A fluid overflow prevention system for positive displacement pump/s as claimed in claims 1, 5 wherein the said slidable second floating device is in the form of inverted U shape, hollow cylinder or a combination thereof. 7. A fluid overflow prevention system for positive displacement pump/s as claimed in claims 1, 3 wherein the said first floating device is made up of delrin. 8. A fluid overflow prevention system for positive displacement pump/s as claimed in claims 1, 7 wherein the said first floating device is in the form of hollow cylindrical like structure provided with a mounting means at one of the ends wherein a part of the curved surface near other end of the said cylinder is flattened. A fluid overflows prevention system for positive displacement pump/s as claimed in claims 1,7,8 wherein weight of the said first floating device is in the range of 58 to 64 grams. A fluid overflows prevention system for positive displacement pump/s as claimed in claims 1, 5, 6 wherein the maximum volume of fluid displaced by the said slidable second floating device is 160 ml.

Documents:

2063-MUM-2007-ABSTRACT(9-8-2011).pdf

2063-MUM-2007-ABSTRACT(GRANTED)-(27-3-2012).pdf

2063-MUM-2007-CANCELLED PAGES(9-8-2011).pdf

2063-mum-2007-claims(17-10-2007).doc

2063-MUM-2007-CLAIMS(17-10-2007).pdf

2063-MUM-2007-CLAIMS(AMENDED)-(10-8-2011).pdf

2063-MUM-2007-CLAIMS(AMENDED)-(8-10-2010).pdf

2063-MUM-2007-CLAIMS(AMENDED)-(9-8-2011).pdf

2063-MUM-2007-CLAIMS(GRANTED)-(27-3-2012).pdf

2063-MUM-2007-CORRESPONDENCE(IPO)-(27-3-2012).pdf

2063-mum-2007-description (provisional).pdf

2063-MUM-2007-DESCRIPTION(COMPLETE)-(17-10-2007).pdf

2063-MUM-2007-DESCRIPTION(GRANTED)-(27-3-2012).pdf

2063-MUM-2007-DRAWING(10-8-2011).pdf

2063-MUM-2007-DRAWING(26-12-2007).pdf

2063-MUM-2007-DRAWING(8-10-2010).pdf

2063-MUM-2007-DRAWING(9-8-2011).pdf

2063-MUM-2007-DRAWING(COMPLETE)-(26-12-2007).pdf

2063-MUM-2007-DRAWING(GRANTED)-(27-3-2012).pdf

2063-MUM-2007-DRAWING(PROVISIONAL)-(17-10-2007).pdf

2063-mum-2007-drawings.pdf

2063-MUM-2007-FORM 1(26-12-2007).pdf

2063-MUM-2007-FORM 18(26-12-2007).pdf

2063-mum-2007-form 2(17-10-2007).doc

2063-mum-2007-form 2(17-10-2007).pdf

2063-MUM-2007-FORM 2(GRANTED)-(27-3-2012).pdf

2063-MUM-2007-FORM 2(TITLE PAGE)-(10-8-2011).pdf

2063-MUM-2007-FORM 2(TITLE PAGE)-(17-10-2007).pdf

2063-MUM-2007-FORM 2(TITLE PAGE)-(9-8-2011).pdf

2063-MUM-2007-FORM 2(TITLE PAGE)-(COMPLETE)-(26-12-2007).pdf

2063-MUM-2007-FORM 2(TITLE PAGE)-(GRANTED)-(27-3-2012).pdf

2063-MUM-2007-FORM 2(TITLE PAGE)-(PROVISIONAL)-(17-10-2007).pdf

2063-MUM-2007-FORM 26(17-10-2007).pdf

2063-MUM-2007-FORM 3(26-12-2007).pdf

2063-MUM-2007-FORM 5(26-12-2007).pdf

2063-MUM-2007-FORM 9(26-12-2007).pdf

2063-mum-2007-form-1.pdf

2063-mum-2007-form-2.doc

2063-mum-2007-form-2.pdf

2063-mum-2007-form-3.pdf

2063-MUM-2007-REPLY TO EXAMINATION REPORT(10-8-2011).pdf

2063-MUM-2007-REPLY TO EXAMINATION REPORT(8-10-2010).pdf

2063-MUM-2007-REPLY TO EXAMINATION REPORT(9-8-2011).pdf

2063-MUM-2007-SPECIFICATION(AMENDED)-(10-8-2011).pdf

2063-MUM-2007-SPECIFICATION(AMENDED)-(8-10-2010).pdf

2063-MUM-2007-SPECIFICATION(AMENDED)-(9-8-2011).pdf

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