EP0234102B1 - Liquid-flow control apparatus - Google Patents
Liquid-flow control apparatus Download PDFInfo
- Publication number
- EP0234102B1 EP0234102B1 EP86309291A EP86309291A EP0234102B1 EP 0234102 B1 EP0234102 B1 EP 0234102B1 EP 86309291 A EP86309291 A EP 86309291A EP 86309291 A EP86309291 A EP 86309291A EP 0234102 B1 EP0234102 B1 EP 0234102B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- liquid
- rotary valve
- metering device
- piston
- 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.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
- B65B3/26—Methods or devices for controlling the quantity of the material fed or filled
- B65B3/30—Methods or devices for controlling the quantity of the material fed or filled by volumetric measurement
- B65B3/32—Methods or devices for controlling the quantity of the material fed or filled by volumetric measurement by pistons co-operating with measuring chambers
Definitions
- the present invention relates to apparatus for controlling liquid flow in a dosing apparatus for filling liquids into containers.
- United States Patent 2,399,300 discloses a filling apparatus including a supply line and a valve therein responsive to pressure in the line for shutting off the line when the line pressure falls below a certain minimum.
- the supply line leads from a source of liquid to a rotary filler tank equipped with filler heads.
- a regulatable source of vacuum is connected through a pipe and a swivel joint into the top of the tank.
- the valve comprises a casing formed with a conical seat with which diametrically opposed, fixed, inlet and outlet ports are in communication.
- a valve plug cooperating with the seat is equipped with an operating handle.
- the plug has a diametric passage including an enlarged middle section.
- the enlargement is formed as a seat with which is co-operable a valve closure member of a check valve mounted in the enlargement.
- the closure member is equipped with a stem which is guided in a spider at the opposite end of the enlargement from the closure member.
- a compression spring encircling the stem and interposed between the spider and the valve closure member acts to seat the latter.
- the two side walls of the plug between the closure member and the spider one is solid, whereas the other is formed with an opening communicating with immediately downstream of the closure member.
- the one side wall positively cuts off the supply line; or the check valve is placed in control of flow through the supply line; or the opening communicates with the fixed inlet port, so that the check valve is by-passed and the supply line is drained into the tank.
- the check valve When the check valve is in control, it serves to differentiate between fluids of different specific gravity; for example between milk and air.
- the vacuum effect is of itself incapable of unseating the check valve, such action being possible only as a result of the total pressure of the liquid acting on the check valve.
- United States Patent 4,254,806 discloses an apparatus for filling caulking tubes in a clean manner with a liquid viscous composition, wherein to a nozzle from which the composition passes into the tube there is connected a suck-back means comprising a first piston-and-cylinder device which retracts away from the nozzle when composition is not being forced into the tube, so as to create suction upon the composition in the nozzle and thus prevent it leaking from the nozzle.
- the first piston-and-cylinder device is operable via a four-way valve via which is also operable a second piston-and cylinder device which turns a rotary valve having first, second and third fixed ports and first and second rotary ports.
- the first fixed port is an inlet for the caulking composition
- the second fixed port communicates with a metering piston-and-cylinder device for the composition
- the third fixed port is an outlet to the nozzle.
- the rotary valve is a two-position valve in one position of which the inlet port is connected via the rotary ports with the second fixed port and in the other position of which the second fixed port is connected via the rotary ports with the outlet port.
- This apparatus is not suitable for handling fluids of differing characteristics, particularly viscosities. Firstly, the resistance to fluid flow of the path from the metering cylinder to the nozzle outlet is the same irrespective of the viscosity of the fluid. Secondly, the stroke of the suck-back means is not adjustable in order to adjust the vacuum produced thereby to the fluid to be filled.
- the apparatus disclosed in European Patent Specification 0138234 and corresponding to the first part of claim 1 has been designed with a view to coping with filling liquids of differing viscosities. It comprises a filler tank from which extend downwards filler heads connected by branch conduits to respective metering cylinders and terminating in outlet nozzles.
- the high-viscosity liquid nozzle comprises a tubular nozzle main body attachable to the filler head, a damper pivoted to the lower end of that body, a damper opening rod vertically movably supported by that body, and a spring for biasing the rod upward.
- the low viscosity liquid nozzle comprises a tubular nozzle main body, a lower check valve in the upper end of that body, and a metal net disposed in the lower end of that body. Not only are these two nozzles rather complicated, but also the changing of them is time-consuming.
- liquid dosing apparatus comprising duct means, a metering device, back flow-preventing valve means upstream of said metering device, a fixed port of said duct means via which said metering device communicates with said duct means and via which said metering device can receive a desired amount of liquid from said duct means and can return said amount to said duct means, and a check valve in said duct means downstream of said metering device, characterized in that a rotary valve is interposed in said duct means, carries said check valve, communicates with said metering device via said fixed port, and includes rotatable ports openable and closable by rotation of said rotary valve to provide selectively and alternatively a route for liquid through said rotary valve from upstream of said rotary valve to said metering device, a route for relatively low viscosity liquid from said metering device through said check valve to downstream of said rotary valve, and a route for relatively high viscosity liquid from said metering device through said
- the apparatus comprises a filler body 1 and a metering device 2, the filler body 1 having an upper portion 3 extending through and projecting upwards beyond the bottom wall 4 of a liquid tank 5 and communicating with the tank 5, and an intermediate portion 6 fixed to the upper portion 3 by a threaded nut 20, and a suction-producing device 8.
- the metering device 2 communicates via a tube 35 with a rotary valve 7 through an end cover 9 of the rotary valve housing 10, the rotary valve 7 including an internal built-in valve seat 11 and a check valve closure member 12 urged towards the valve seat 11 by a helical tension spring 12', a bushing on the valve stem 12" limiting the downward stroke of the member 12.
- the rotary valve is rotatable through 113° by an air cylinder 41 or a mechanical drive, itself controlled by a timer, and includes three rotary ports 34, 34' and 39 arranged at intervals of 67° between the ports 34 and 34' and of 113° between the ports 34' and 39, and two fixed ports 36 and 40 at 180° intervals.
- the device 8 is fixed to a lower cylindrical part of the intermediate portion 6 and includes a vacuum chamber 8' separated from the interior of the filler body 1 by a roll membrane 14 and connected to a vacuum pump (not shown), a membrane piston 15 being pressed towards a stop pin 16 by a spring 17 when the chamber 8' is not under vacuum, and the length of stroke being adjustable by a screw 18 centrally threaded in a vacuum chamber cover 19 of the device 8.
- the negative pressure in the chamber 8' can be adjusted with a bleeder nozzle (not shown).
- the upper portion 3 has inlet openings 21 for high viscosity liquid. Below the openings is an O-ring 37 mounted in an annular groove in the inner surface 22 of the portion 3.
- An inlet piston 23 has, for low viscosity liquid, an inlet check valve 24 built-in.
- the piston 23 is lowered axially in the portion 3 to seal against the 0-ring 37.
- the piston 23 is operated by an air cylinder not shown in Fig. 1.
- the piston 23 has to be lifted by the air cylinder to release trapped air from the body 1.
- Vertical grooves 25 are made in the surface 22 to allow the escape of surplus liquid when the piston is lowered.
- the lower portion of the filler body 1 comprises a tubular part 26 which is attached to the intermediate portion 6 by means of a fastening nut 27 screwed on a threaded end 28 of the portion 6.
- a flexible nozzle 38 is mounted in a groove 29 on the lower end zone of the tubular part 26.
- the nozzle is made of a resilient material and has outlet lips which are pressed sealingly together by the resilience of the material.
- the metering device comprises a metering cylinder 30 comprised of a cylindrical body 31, a piston 32 and a piston rod 33.
- the rotary valve 7 turns back 113°.
- the vacuum chamber 8' is immediately evacuated and a negative pressure is created in the part 26.
- the metering cylinder 30 is filled by a downward stroke of the piston 32.
- the piston 23 is in its top position to release air.
- the piston 23 is moved downwards to seal against the O-ring 37.
- Surplus liquid in the filler body 1 will then partly escape to the tank 5 through the grooves 25 and partly be pressed out through the check valve 12 ( Figure 5).
- the check valve 24 closes and the check valve 12 opens and liquid is discharged through the nozzle 38 ( Figure 6).
- the device 8 is operated by an external vacuum control valve (not shown).
- the dosing apparatus described above has an advantage that it can be changed between handling low viscosity liquid and handling high viscosity liquid by simply raising or lowering the piston 23 and by simply rendering operative or inoperative the rotary valve 7, so that it is not necessary to dismantle and change any part of the apparatus.
- Another advantage is that the vacuum in the chamber 8' can be readily adjusted without interrupting production.
- the membrane piston 15 of the device 8 has been replaced by a piston 115 sealingly encircled by an O-ring 110 housed in an annular internal groove in a cylinder 103.
- the piston 115 includes a central rod 119 on which is held by a nut 116 a piston ring 113 between two clamping rings 104 and 105.
- the piston 115 is double-acting, compressed air being introduced alternately through parts 106 and 107 at respective opposite sides of the piston ring 113.
- a set screw 118 screwed axially into the outer end of the cylinder 103 adjustably sets the stroke of the piston and thus the magnitude of the suction produced in the chamber between the valve 7 and the nozzle 38.
- a boss or a hole 114 for an Allen key or the like is formed in that end of the piston 115 bounding the latter chamber, to permit tightening of the nut 116 without the need to dismantle the device 8.
Abstract
Description
- The present invention relates to apparatus for controlling liquid flow in a dosing apparatus for filling liquids into containers.
- United States Patent 2,399,300 discloses a filling apparatus including a supply line and a valve therein responsive to pressure in the line for shutting off the line when the line pressure falls below a certain minimum. The supply line leads from a source of liquid to a rotary filler tank equipped with filler heads. A regulatable source of vacuum is connected through a pipe and a swivel joint into the top of the tank. The valve comprises a casing formed with a conical seat with which diametrically opposed, fixed, inlet and outlet ports are in communication. A valve plug cooperating with the seat is equipped with an operating handle. The plug has a diametric passage including an enlarged middle section. At one end the enlargement is formed as a seat with which is co-operable a valve closure member of a check valve mounted in the enlargement. The closure member is equipped with a stem which is guided in a spider at the opposite end of the enlargement from the closure member. A compression spring encircling the stem and interposed between the spider and the valve closure member acts to seat the latter. Of the two side walls of the plug between the closure member and the spider, one is solid, whereas the other is formed with an opening communicating with immediately downstream of the closure member. Depending upon the position of the plug as set using the handle, the one side wall positively cuts off the supply line; or the check valve is placed in control of flow through the supply line; or the opening communicates with the fixed inlet port, so that the check valve is by-passed and the supply line is drained into the tank. When the check valve is in control, it serves to differentiate between fluids of different specific gravity; for example between milk and air. The vacuum effect is of itself incapable of unseating the check valve, such action being possible only as a result of the total pressure of the liquid acting on the check valve.
- United States Patent 4,254,806 discloses an apparatus for filling caulking tubes in a clean manner with a liquid viscous composition, wherein to a nozzle from which the composition passes into the tube there is connected a suck-back means comprising a first piston-and-cylinder device which retracts away from the nozzle when composition is not being forced into the tube, so as to create suction upon the composition in the nozzle and thus prevent it leaking from the nozzle. The first piston-and-cylinder device is operable via a four-way valve via which is also operable a second piston-and cylinder device which turns a rotary valve having first, second and third fixed ports and first and second rotary ports. The first fixed port is an inlet for the caulking composition, the second fixed port communicates with a metering piston-and-cylinder device for the composition and the third fixed port is an outlet to the nozzle. The rotary valve is a two-position valve in one position of which the inlet port is connected via the rotary ports with the second fixed port and in the other position of which the second fixed port is connected via the rotary ports with the outlet port. This apparatus is not suitable for handling fluids of differing characteristics, particularly viscosities. Firstly, the resistance to fluid flow of the path from the metering cylinder to the nozzle outlet is the same irrespective of the viscosity of the fluid. Secondly, the stroke of the suck-back means is not adjustable in order to adjust the vacuum produced thereby to the fluid to be filled.
- The apparatus disclosed in European Patent Specification 0138234 and corresponding to the first part of
claim 1 has been designed with a view to coping with filling liquids of differing viscosities. It comprises a filler tank from which extend downwards filler heads connected by branch conduits to respective metering cylinders and terminating in outlet nozzles. - Two kinds of outlet nozzles are selectively mountable at the end of each filler head; one for high viscosity liquid and the other for low viscosity liquid. The high-viscosity liquid nozzle comprises a tubular nozzle main body attachable to the filler head, a damper pivoted to the lower end of that body, a damper opening rod vertically movably supported by that body, and a spring for biasing the rod upward. The low viscosity liquid nozzle comprises a tubular nozzle main body, a lower check valve in the upper end of that body, and a metal net disposed in the lower end of that body. Not only are these two nozzles rather complicated, but also the changing of them is time-consuming.
- According to the present invention, there is provided liquid dosing apparatus, comprising duct means, a metering device, back flow-preventing valve means upstream of said metering device, a fixed port of said duct means via which said metering device communicates with said duct means and via which said metering device can receive a desired amount of liquid from said duct means and can return said amount to said duct means, and a check valve in said duct means downstream of said metering device, characterized in that a rotary valve is interposed in said duct means, carries said check valve, communicates with said metering device via said fixed port, and includes rotatable ports openable and closable by rotation of said rotary valve to provide selectively and alternatively a route for liquid through said rotary valve from upstream of said rotary valve to said metering device, a route for relatively low viscosity liquid from said metering device through said check valve to downstream of said rotary valve, and a route for relatively high viscosity liquid from said metering device through said rotary valve other than via said check valve to downstream of said rotary valve.
- Owing to the invention, it is possible to provide apparatus which smoothly and efficiently controls the flow of high viscosity liquids as well as low viscosity liquids.
- In order that the invention may be clearly understood and readily carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which:
- Fig. 1 shows a view, mainly in vertical section, of a dosing apparatus for filling liquid into containers,
- Fig. 2 shows a view which is mainly a horizontal section taken on the line A-A of Fig. 1,
- Figs. 3 and 4 are respective views similar to Fig. 1, but diagrammatic and illustrating the apparatus during high viscosity liquid prefilling and filling stages, respectively,
- Figs. 5 and 6 are respective views similar to Figs. 3 and 4, but during low viscosity liquid prefilling and filling stages, respectively, and
- Fig. 7 shows two half-views of a modification of the apparatus, an upper half-view being substantially a vertical section, and the lower half-view being a sectional side elevation.
- Referring to the drawings, the apparatus comprises a
filler body 1 and ametering device 2, thefiller body 1 having anupper portion 3 extending through and projecting upwards beyond thebottom wall 4 of aliquid tank 5 and communicating with thetank 5, and anintermediate portion 6 fixed to theupper portion 3 by a threadednut 20, and a suction-producingdevice 8. Themetering device 2 communicates via atube 35 with arotary valve 7 through anend cover 9 of therotary valve housing 10, therotary valve 7 including an internal built-invalve seat 11 and a checkvalve closure member 12 urged towards thevalve seat 11 by a helical tension spring 12', a bushing on thevalve stem 12" limiting the downward stroke of themember 12. The rotary valve is rotatable through 113° by anair cylinder 41 or a mechanical drive, itself controlled by a timer, and includes threerotary ports ports 34 and 34' and of 113° between theports 34' and 39, and twofixed ports device 8 is fixed to a lower cylindrical part of theintermediate portion 6 and includes a vacuum chamber 8' separated from the interior of thefiller body 1 by aroll membrane 14 and connected to a vacuum pump (not shown), amembrane piston 15 being pressed towards astop pin 16 by aspring 17 when the chamber 8' is not under vacuum, and the length of stroke being adjustable by ascrew 18 centrally threaded in avacuum chamber cover 19 of thedevice 8. The negative pressure in the chamber 8' can be adjusted with a bleeder nozzle (not shown). - The
upper portion 3 has inletopenings 21 for high viscosity liquid. Below the openings is an O-ring 37 mounted in an annular groove in theinner surface 22 of theportion 3. - An
inlet piston 23 has, for low viscosity liquid, aninlet check valve 24 built-in. When the filler is used for low viscosity liquid thepiston 23 is lowered axially in theportion 3 to seal against the 0-ring 37. Thepiston 23 is operated by an air cylinder not shown in Fig. 1. - The
piston 23 has to be lifted by the air cylinder to release trapped air from thebody 1.Vertical grooves 25 are made in thesurface 22 to allow the escape of surplus liquid when the piston is lowered. - The lower portion of the
filler body 1 comprises atubular part 26 which is attached to theintermediate portion 6 by means of a fasteningnut 27 screwed on a threadedend 28 of theportion 6. Aflexible nozzle 38 is mounted in agroove 29 on the lower end zone of thetubular part 26. The nozzle is made of a resilient material and has outlet lips which are pressed sealingly together by the resilience of the material. - The metering device comprises a metering
cylinder 30 comprised of acylindrical body 31, apiston 32 and apiston rod 33. - Operating the filler for high viscosity liquid filling With the
piston 23 permanently in its upper position, the downward stroke of thepiston 32 in the meteringcylinder 30 permits liquid to flow into the cylinder from thetank 5 through theopenings end cover 9 and the tube 35 (Figure 3). When the downward stroke is completed, therotary valve 7 is turned through 113° by means of theair cylinder 41 or mechanical device to close theport 36 and open theports 34' and 40 to thenozzle 38. When themetering piston 32 moves upward the liquid flows from the meteringcylinder 30 to thenozzle 38 and into a container to be filled (Figure 4). - As the
metering piston 32 reaches its top position therotary valve 7 turns back 113°. When theport 40 is closed, the vacuum chamber 8' is immediately evacuated and a negative pressure is created in thepart 26. - With the
port 34 open, the meteringcylinder 30 is filled by a downward stroke of thepiston 32. Thepiston 23 is in its top position to release air. When the filling starts, thepiston 23 is moved downwards to seal against the O-ring 37. Surplus liquid in thefiller body 1 will then partly escape to thetank 5 through thegrooves 25 and partly be pressed out through the check valve 12 (Figure 5). When thepiston 32 is moved upwards thecheck valve 24 closes and thecheck valve 12 opens and liquid is discharged through the nozzle 38 (Figure 6). - When the
piston 32 ends its upward stroke the spring-loadedcheck valve 12 closes. - If the
check valve 12 does not create the necessary negative pressure in thenozzle 38, thedevice 8 is operated by an external vacuum control valve (not shown). - The dosing apparatus described above has an advantage that it can be changed between handling low viscosity liquid and handling high viscosity liquid by simply raising or lowering the
piston 23 and by simply rendering operative or inoperative therotary valve 7, so that it is not necessary to dismantle and change any part of the apparatus. Another advantage is that the vacuum in the chamber 8' can be readily adjusted without interrupting production. - In the modification shown in Figure 7, the
membrane piston 15 of thedevice 8 has been replaced by apiston 115 sealingly encircled by an O-ring 110 housed in an annular internal groove in acylinder 103. Thepiston 115 includes acentral rod 119 on which is held by a nut 116 apiston ring 113 between two clampingrings piston 115 is double-acting, compressed air being introduced alternately throughparts piston ring 113. Aset screw 118 screwed axially into the outer end of thecylinder 103 adjustably sets the stroke of the piston and thus the magnitude of the suction produced in the chamber between thevalve 7 and thenozzle 38. A boss or ahole 114 for an Allen key or the like is formed in that end of thepiston 115 bounding the latter chamber, to permit tightening of thenut 116 without the need to dismantle thedevice 8.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86309291T ATE55741T1 (en) | 1985-11-27 | 1986-11-27 | APPARATUS FOR CONTROLLING A FLOW OF LIQUID. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8529204 | 1985-11-27 | ||
GB858529204A GB8529204D0 (en) | 1985-11-27 | 1985-11-27 | Liquid-flow control apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0234102A1 EP0234102A1 (en) | 1987-09-02 |
EP0234102B1 true EP0234102B1 (en) | 1990-08-22 |
Family
ID=10588861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86309291A Expired - Lifetime EP0234102B1 (en) | 1985-11-27 | 1986-11-27 | Liquid-flow control apparatus |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0234102B1 (en) |
AT (1) | ATE55741T1 (en) |
DE (1) | DE3673632D1 (en) |
ES (1) | ES2016562B3 (en) |
GB (1) | GB8529204D0 (en) |
GR (1) | GR3001026T3 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4905744A (en) * | 1987-07-23 | 1990-03-06 | Elopak A/S | Liquid-flow control apparatus |
GB9809123D0 (en) | 1998-04-30 | 1998-07-01 | Elopak Systems | Method and apparatus |
CN110626531A (en) * | 2019-09-25 | 2019-12-31 | 河北晓进机械制造股份有限公司 | Hard tube material filling production line |
CN112173193B (en) * | 2020-10-28 | 2022-05-10 | 山东微粮智能科技有限公司 | Eight-treasure porridge filling anti-dripping device |
CN113428409A (en) * | 2021-07-21 | 2021-09-24 | 江苏长沐智能装备有限公司 | Liquid filling machine suitable for high viscosity material |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2399300A (en) * | 1941-08-29 | 1946-04-30 | Crown Cork & Seal Co | Filling apparatus and valve |
DE2520402C3 (en) * | 1975-05-07 | 1978-12-07 | Jagenberg-Werke Ag, 4000 Duesseldorf | Dosing device for liquids |
US4254806A (en) * | 1979-04-25 | 1981-03-10 | Robert M. Elsworth | Apparatus for filling caulking tubes in a clean manner |
JPS6045192A (en) * | 1983-08-19 | 1985-03-11 | 四国化工機株式会社 | Fixed-quantity filler for liquid |
-
1985
- 1985-11-27 GB GB858529204A patent/GB8529204D0/en active Pending
-
1986
- 1986-11-27 DE DE8686309291T patent/DE3673632D1/en not_active Expired - Lifetime
- 1986-11-27 ES ES86309291T patent/ES2016562B3/en not_active Expired - Lifetime
- 1986-11-27 AT AT86309291T patent/ATE55741T1/en not_active IP Right Cessation
- 1986-11-27 EP EP86309291A patent/EP0234102B1/en not_active Expired - Lifetime
-
1990
- 1990-10-19 GR GR90400786T patent/GR3001026T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP0234102A1 (en) | 1987-09-02 |
GB8529204D0 (en) | 1986-01-02 |
DE3673632D1 (en) | 1990-09-27 |
GR3001026T3 (en) | 1992-01-20 |
ES2016562B3 (en) | 1990-11-16 |
ATE55741T1 (en) | 1990-09-15 |
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