IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0582034
(1984-02-21)
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발명자
/ 주소 |
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인용정보 |
피인용 횟수 :
8 인용 특허 :
0 |
초록
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An automatic shutoff device of the type which makes use of a venturi to terminate the flow of a liquid into a container when the liquid in the container reaches the level of the discharge tube. A movable housing is operatively positioned downstream of a constrictive nozzle giving rise to the venturi
An automatic shutoff device of the type which makes use of a venturi to terminate the flow of a liquid into a container when the liquid in the container reaches the level of the discharge tube. A movable housing is operatively positioned downstream of a constrictive nozzle giving rise to the venturi and a consequent low pressure area; the movable housing substantially encompasses the low pressure area except that the downstream end of the housing is open and may serve as a discharge tube from which liquid flows into the container to be filled, the filling operation continues until such time as the level of the liquid reaches the level of the discharge tube at which time liquid is rapidly drawn into the low pressure area causing the housing to move in the downstream direction thereby overcoming the restoring force of an associated spring biased valve causing the valve to seat to thereby substantially terminate the flow of liquid.
대표청구항
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1. An automatic shutoff device for controlling the flow of liquid flowing in a downstream direction comprising an extended sleeve having an upstream end and a downstream end, said extended sleeve directing said liquid flowing in said downstream direction into a container to be filled; a tubular m
1. An automatic shutoff device for controlling the flow of liquid flowing in a downstream direction comprising an extended sleeve having an upstream end and a downstream end, said extended sleeve directing said liquid flowing in said downstream direction into a container to be filled; a tubular member within said extended sleeve, said tubular member further comprising an input end and an output end, said input end of said tubular member being flared outwardly; an adaptor, one end portion of which is internally threaded, the other end portion of said adaptor being inwardly flared such that when said tubular member is inserted within said adaptor the outwardly flared portion of said tubular member cooperatively rests on the inwardly projecting end portion of said adaptor; a conically shaped perforated baffle positioned within said adaptor such that said conically shaped perforated baffle projects into said tubular member from the input end thereof; the output end of said tubular member further comprising a downstream projecting constrictive nozzle having an orifice of substantially reduced cross section relative to the cross section of said input end of said tubular member, said output end of said tubular member further comprising a valve seat; a ball operatively positioned within said tubular member and in proximity to said output end thereof to enable said ball to serve as a valve for substantially terminating the flow of fluid from the source of fluid supply; a spring connected at one end to said ball and at the other end to said baffle, said spring normally biasing said valve to its open position; a longitudinally extended housing one end of which is open and of substantially larger diameter than the diameter of said downstream projecting constrictive nozzle, the other end of said longitudinally extended housing comprising an opening of reduced cross section relative to the cross sectional diameter of said tubular member so as to enable said longitudinally extended housing to be mounted on said downstream projecting constrictive nozzle and slidably movable thereon; an actuator comprising a relatively stiff rodlike member connected at one end to said ball and projecting through said downstream projecting constrictive nozzle, said actuator being attached at its other end to said longitudinally extended housing; whereby, when selectively actuated, fluid flows from a fluid supply source into said automatic shutoff device via said adaptor past said baffle and into said tubular member via said input end, around said spring and ball, said fluid thereafter passes out said downstream projecting constrictive nozzle at substantial velocity and follows a conforming path defined by said extended sleeve into the container to be filled, such flow continues until such time as the fluid level within the container rises to a level which completely immerses the downstream end of said extended sleeve whereby a negative pressure area is formed at the orifice of the downstream projecting constrictive nozzle in consequence of which liquid flows into said extended sleeve and immerses the end of said longitudinally extended housing causing said housing to move in the downstream direction causing said ball to seat on said valve seat thereby substantially terminating the flow of fluid through said device. 2. A liquid level automatic shutoff device comprising a tubular member defining a fluid flowpath, said tubular member having an input end and an output end, said output end of said tubular member further comprising a constrictive nozzle projecting in the downstream direction of fluid flow, said constrictive nozzle having an orifice of substantially reduced cross section relative to the cross section of said input end of said tubular member, valving means positioned in said fluid flowpath, said valving means being normally biased to the open position, said valving means further comprising means selectively operative to substantially terminate the flow of fluid along said fluid flowpath, actuating means attached at one end to said valving means and extending through said orifice, a longitudinally extended member having an open end of substantially the same cross sectional diameter as the input end of said tubular member, the other end of said longitudinally extended member having an opening of substantially reduced cross section enabling said longitudinally extended member to be slidably positioned on said projection and in close fitting relation thereto, whereby fluid flows through said fluid flowpath so long as said open end of said longitudinally extended member is exposed to a gaseous medium at a positive pressure as a consequence of which said normally open valving means remains open, and at such time as said open end of said longitudinally extended member becomes immersed in liquid said longitudinally extended member slides on said projection in said downstream direction of fluid flow causing said valving means to become selectively operative to thereby substantially terminate the flow of fluid along said flowpath. 3. A liquid-level responsive automatic shutoff valve, comprising: a tubular member defining a fluid flowpath, said tubular member having an input end and an output end, said output end of said tubular member further comprising a projection axially extending in the direction of said fluid flowpath, said projection further comprising a constrictive opening of substantially reduced diameter relative to the diameter of said input end of said tubular member; valving means positioned in said fluid flowpath, said valving means having an open portion and a closed portion, said valving means being normally biased to its open position, said valving means when biased to said closed position substantially terminating the flow of fluid through said constrictive opening; actuating means attached at one end to said valving means and extending through said constrictive opening; a longitudinally extended member one end of which comprises an open end of substantially larger diameter than the diameter of said constrictive opening, said longitudinally extended member further comprising another end, said another end comprising an opening of reduced cross section so as to enable said longitudinally extended member to be slidably positioned on said projection in substantially air-tight relationship thereto; said actuator being further attached to said longitudinally extended member; whereby, so long as said open end of said longitudinally extended member is exposed to a gaseous medium at a positive pressure said valving means remains biased in said open position permitting fluid to enter said tubular member and to flow along said fluid path and be exhausted at substantial velocity through said open end of said longitudinally extended member, which flow continues until such time as said open end of said longitudinally extended member becomes completely immersed in liquid at which time a negative pressure area develops within said longitudinally extended member causing said another end of said longitudinally extended member to slidably move on said projection thereby causing said valving means to move to said closed position to thereby terminate the flow of fluid through said constrictive opening. 4. A liquid level responsive automatic shutoff valve comprising, a tubular member defining a fluid flowpath, a valve seat positioned within said fluid flowpath, a downstream projection comprising a constrictive opening in said fluid flowpath, said constrictive opening being of substantially smaller diameter than the diameter of said tubular member, a normally open valve operatively positioned with respect to said valve seat, said valve capable of being selectively moved into closed position with respect to said valve seat, an actuator projecting through said constrictive opening, a longitudinally extended housing, said longitudinally extended housing being bell-shaped at one end and having an annular opening at the bell-shaped end of said longitudinally extended housing, said annular opening being of substantially the same cross sectional diameter as the external diameter of the projection comprising said constrictive opening such that said annular opening of said end of said longitudinally extended housing may be slidably positioned on said projection, said actuator having a first end and a second end, the first end of said actuator being attached to said valve and the second end of said actuator being attached to said longitudinally extended housing. 5. A valving device comprising a fluid conducting member having an inlet port and a discharge port, said discharge port terminating in a downstream projecting constrictive nozzle forming a venturi, said discharge port further comprising a valve seat, a normally open valve operatively positioned to cooperate with said valve seat, a tubular housing, having an upstream end and a downstream end, movably mounted with respect to said constrictive nozzle, the upstream end of said tubular housing reduced in section to substantially enclose said constrictive nozzle, said upstream end of said tubular housing terminating in substantially airtight contact with said constrictive nozzle, the downstream end of said tubular housing being open, and an actuator mechanically connecting said tubular housing to said valve. 6. A valving device as set forth in claim 5 in which said tubular housing comprises a member having a bell-shaped end and having an orifice at the bell-shaped end thereof enabling said housing to be slidably mounted with respect to said nozzle. 7. A valving device as set forth in claim 5 in which said tubular housing is flexibly secured to said downstream projecting nozzle. 8. A valving device as set forth in claim 5 in which said valve further comprises a ball connected at one end to a spring under tension.
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