Filling device

Abstract

A valve assembly in a product channel comprises a regulating valve, a filling valve, and an elongated actuation element that is common to both. A filling-valve element that interacts with a filling-valve seat to open and close the filling valve. The regulating valve comprises an actuation element-side regulating valve element that interacts with a regulating-valve seat to control a product quantity to be filled. Both the regulating and filling valve elements are arranged on the actuation element. A driven actuator changes a position of the actuation element relative to the regulating valve seat and the filling valve seat as part of a filling operation.

Claims

1. An apparatus comprising a filling device for filling a container with a liquid, wherein said filling device comprises a product supply and a valve assembly that is arranged downstream of said product supply, wherein said valve assembly comprises a regulating valve and a filling valve arranged downstream in a flow direction of said product, wherein said filling device further comprises an elongated actuation-element that is common to said regulating valve and said filling valve, wherein said filling device further comprises a product channel that runs in a longitudinal direction of said actuation element and that extends from said product supply to a dispensing opening of said filling device, wherein said valve assembly is arranged in said product channel, wherein said regulating valve comprises an actuation-element-side regulating-valve element that interacts with a regulating-valve seat in order to control a product quantity to be filled, wherein said filling valve further comprises an actuation element-side filling-valve element that interacts with a filling-valve seat in order to open and close said filling valve, wherein both said regulating-valve element and said filling-valve element are arranged on said actuation element, wherein said filling device comprises at least one driven actuator in order to change a position of said actuation element relative to said regulating-valve seat and said filling-valve seat as part of a filling operation, wherein said regulating-valve seat is arranged in said product channel via at least one of a first and second longitudinally adjustable element, wherein said first and second longitudinally adjustable elements are located on regulating-valve seat faces that face away from each other, wherein a distance from said regulating-valve seat to said filling-valve seat is variable.

2. The apparatus of claim 1, wherein said position of said regulating-valve seat is adjustable by way of an actuator drive.

3. The apparatus of claim 2, further comprising a flow meter that provides a flowmeter signal and a controller for controlling said actuator drive, wherein said controller is configured to operate said actuator drive as a function of said signal.

4. The apparatus of claim 3, wherein said flowmeter comprises a magnetic-inductive flow meter.

5. The apparatus of claim 4, wherein said magnetic-inductive flow meter surrounds said product channel.

6. The apparatus of claim 1, wherein said product channel is formed by an annular space that surrounds said actuation element.

7. The apparatus of claim 1, wherein said first longitudinally adjustable element comprises a first gaiter and said second longitudinally adjustable element comprises a second gaiter.

8. The apparatus of claim 7, wherein said first and second gaiters form part of a wall of said product channel.

9. The apparatus of claim 7, wherein said first and second gaiters comprise polytetrafluoroethylene.

10. The apparatus of claim 1, wherein said actuation element comprises a valve rod.

11. The apparatus of claim 1, wherein at least one of said regulating-valve element and said filling-valve element is formed by a valve plug that is configured on said actuation element.

12. The apparatus of claim 1, wherein said product supply comprises a collecting vessel, wherein a sealing collar is arranged at said dispensing opening for forming a sealed connection between said dispensing opening and a container opening of a container that is to be filled, wherein said sealing collar surrounds a sealed-off filling region from which a return gas channel extends to said collecting vessel.

13. The apparatus of claim 1, wherein a compression spring pretensions said regulating-valve seat onto a stop into an idle position in which said filling valve is open and wherein said regulating-valve seat is movable toward said filling valve by said regulating-valve element.

14. The apparatus of claim 1, wherein said regulating-valve seat, when engaged with said regulating-valve element, forms said actuator to move said actuation element.

15. The apparatus of claim 14, wherein said actuation element is pre-tensioned by a spring into an idle position in which said filling valve is open, wherein said regulating-valve element is arranged on said actuation element between said regulating-valve seat and said filling-valve seat, wherein said actuation element can be moved by said engaging of said regulating-valve seat on said regulating-valve element in closed position of said filling valve.

16. The apparatus of claim 14, wherein said regulating-valve element is arranged on said actuation element between said product supply and said regulating-valve seat and wherein said regulating-valve seat is pre-tensioned by a spring against said regulating-valve element when said actuation element is in idle position.

17. The apparatus of claim 1, wherein said filling device is one of a plurality of filling devices that define a filling machine.

18. The apparatus of claim 17, further comprising a gate control for operating actuators of said filling devices.

19. The apparatus of claim 7, wherein said first and second gaiters comprise stainless steel.

20. The apparatus of claim 12, wherein a vacuum channel extends from said sealed-off filling region to a vacuum source.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is described below for example with reference to drawings in which:

(2) FIG. 1 shows a partial-section vertical side view of a first embodiment of a filling device;

(3) FIG. 2 shows a partial-section vertical side view of a second embodiment of a filling device;

(4) FIG. 3 shows a partial-section vertical side view of a third embodiment of the filling device;

(5) FIG. 4 shows a partial-section vertical side view of a fourth embodiment of the filling device;

(6) FIG. 5 shows a partial-section vertical side view of a fifth embodiment of the filling device;

(7) FIG. 6 shows a partial-section vertical side view of a sixth embodiment of the filling device largely in accordance with the third embodiment in FIG. 3, and

(8) FIG. 7 shows a partial-section vertical side view of a seventh embodiment of the filling device largely in accordance with the fourth embodiment in FIG. 4.

DETAILED DESCRIPTION

(9) FIG. 1 shows a filling device 10 having a vertically-extending mounting frame 11 at the top of which is held a product supply 12 comprising a collecting vessel 15 into which a product supply-line 17 opens. A product channel 14 extends downward from the product supply 12. At its lower end, the product channel 14 opens out into a dispensing opening 16. A container 44 to be filled lies under the dispensing opening 16.

(10) Arranged within the product channel 14 is an actuation element 20. In some embodiments, the actuation element 20 comprises a valve rod and an actuator 18 that axially adjusts the valve rod. An upper gaiter 22 seals off the valve rod 20 from the collecting vessel 15.

(11) A regulating valve 24 is arranged in the product channel 14 beneath the product supply 12 and upstream from a filling valve 26 at the lower end of the product channel 14.

(12) The regulating valve 24 includes an annular regulating-valve seat 28. An actuator drive 30 adjusts the regulating-valve seat 28 in an axial direction of the actuation element 20. The regulating-valve seat 28 surrounds the actuation element 20 and interacts with a regulating-valve element 32, which in the illustrated embodiment is a valve plug.

(13) First and second gaiters 34, 36 flex as the regulating-valve seat 28 moves up or down. The first and second gaiters 34, 36 define part of the product channel 14. Each of the first and second gaiters 34, 36 has a smooth inner surface that faces the product channel 14 and thus comes into contact with the product. As a result of their smoothness, these inner surfaces promote smoother flow and are easy to clean.

(14) At the lower end of the product channel 14, a filling-valve seat 38 interacts with a filling-valve element 40 that forms a valve plug. These cooperate to form the filling valve 26.

(15) Between the regulating valve 24 and the filling valve 26 is a flow meter 42 that measures the volumetric flow rate through the product channel 14 and provides it to a controller to be used for controlling the actuator drive 30 and hence the product flow when the filling valve 26 is open. In the illustrated embodiment, the flow meter 42 is a magnetic-inductive flow meter

(16) In operation, the actuator 18 controls the movement of the valve rod 20. This can be carried out using the filling machine's guide gate. For each filling operation, the flow meter 42 or controller integrates flow to obtain the quantity of product that has been dispensed during that filling operation and provides that measurement to the controller.

(17) The controller compares this measured quantity with a desired value. Based on the result of this comparison, the controller generates a control signal that controls the actuator drive 30. This controls the position of the regulating-valve seat 28 and hence the size of the passage between the regulating-valve element 32 and the regulating-valve seat 28. As a result, it is possible to set the product flow while the filling valve 26 is open.

(18) The filling quantity can always be optimally set to a desired value in this way. The opening and closing of the filling valve 26, i.e. the time-based control of the filling operation, is determined solely by the actuator 18, whereas the product quantity that is dispensed with each filling operation is accurately regulated through the cooperation of the flowmeter 42, the controller, and the actuator drive 30 that it controls. This results in a simple valve design having a high delivery rate and accurate control over fill quantity.

(19) FIG. 2 shows a second embodiment of the invention. In FIG. 2, as well as in all subsequent figures, identical reference numbers identify those parts that are identical or have the same functions.

(20) Unlike the embodiment shown in FIG. 1, no separate actuator 18 controls the valve rod 52 shown in the second embodiment. Instead, a spring 54 extending between the collecting vessel's base and a drive 58 on the valve rod 52 urges the valve rod 52 against an upper stop 56.

(21) In the idle position of the filling device 50, as shown in FIG. 2, the filling valve plug 40 is at a non-zero distance from the filling-valve seat 38. This causes the filling valve 26 to open so that filling can occur.

(22) A regulating-valve plug 60 is arranged beneath the regulating-valve seat 28. As a result, when the actuator drive 30 presses down, the regulating-valve seat 28 presses down on the regulating-valve plug 60. This, in turn, causes the filling valve 26 to close.

(23) In the second embodiment, the actuator drive 30 uses the regulating-valve seat 28 to both set the product quantity and also to close the filling valve. It causes the former by moving the regulating-valve seat 28 upward and causes the latter by moving it downward. Since setting the regulating-valve seat 28 controls both the product quantity and the duration of the filling operation, there is no need for a separate actuator for the valve rod 52. The second embodiment also permits the flow meter's measurement to be used for both regulating the flow rate during a filling operation and also for regulating the duration of that filling operation. As a result, the filling machine no longer needs a guide gate.

(24) A third embodiment 70, shown in FIG. 3, places a spring 72 between the regulating-valve seat 28 and the flowmeter 42. In this position, the spring 72 urges the regulating-valve seat 28 towards an upper annular stop 74.

(25) The third embodiment 70 permits adjusting the filling quantity upward by having the actuator 18 deflect the valve rod 20.

(26) In this third embodiment, it is possible to adjust the filling quantity upward by having the actuator 18 deflect the valve rod 20. To close the filling valve 26, the valve rod 14 is made to descend so that the filling-valve plug 40 engages the filling-valve seat 38.

(27) In this third embodiment 70, no separate actuator drive is needed to adjust the distance between the regulating-valve seat 28 and the filling-valve seat 38. Instead the axial adjustment of the regulating-valve seat 38 is brought about by having the actuator 18 act against the force of the spring 72.

(28) FIG. 4 shows a further embodiment of a filling device 76 that is similar to that shown in FIG. 2 but with the valve rod 78 having been modified. In this embodiment, the spring 54 and the driver 58 are above rather than inside the collective vessel 15. The embodiment of FIG. 4 operates in a manner that is essentially the same as that already discussed in connection with FIG. 2.

(29) FIG. 5 shows a filling device 80 that is largely identical to that shown in FIG. 4 but with the addition of a sealing collar 82 beneath the dispensing opening 16. The sealing collar 82 has a lower sealing-flange 84. A control lever 86, a pushrod 88, and a guide roll 90 cooperate to vertically move the lower sealing flange 84 along the axis of the valve rod 78. A guide gate 92 of the filling machine 80 controls this motion. The control mechanism allows the lower sealing flange 84 of the sealing collar 82 to be set down tightly onto the mouth 94 of a bottle 44 that is to be filled, thus defining a filling space. This makes the filling device 80 particularly useful for pressurized filling of carbonated drinks.

(30) The mounting frame 11 of the filling device 80 comprises a lower reinforced ring plate 96 through which a return gas channel 98 extends. The return gas channel 98 connects a return gas line 100 to an upper part 102 of the collecting vessel 15. A vacuum channel 104 connects the filling space to a vacuum source 106. This permits the vacuum source 106 to intercept gas, including carbon dioxide, that escapes from the bottle 44 during filling. The filling device 80 is controlled as in the case of the filling device shown in FIG. 4.

(31) FIG. 6 shows a sixth embodiment 110 that is similar to that shown in FIG. 3 but with the addition of a fluid connection 112 that comprises a possibly pressurized fluid source 114, a fluid line 116, and a microprocessor-controlled control valve 118 arranged in the fluid line 116. The fluid line 116 extends between the fluid source 114 and the product channel 14.

(32) To clean the filling device, it is possible for the control valve 118 to supply cleaning fluid from the fluid source 114.

(33) In case of an interruption in the filling process, it is possible for the control valve 118 to supply hot water from the fluid source 114 so as to hold the apparatus in the region of the filling valve at a suitable temperature for hot filling.

(34) A plurality of such fluid connections 112 and fluid sources 114 can be arranged in in the filling device so that different fluids, e.g. cleaning fluid and hot water, can be selected and passed through the product channel 14.

(35) FIG. 7 shows a seventh embodiment 120 that is largely identical to the fourth embodiment according to FIG. 4. In the seventh embodiment, guide rods 126 guide vertical displacement of a lower housing part 122. The lower housing part 122 accommodates the product channel 14 and carries the flow meter 42, the filling-valve seat 38 and the dispensing opening 16.

(36) Springs 128 support the lower housing part on support plates 130 that are attached to the lower end of the guide rods 126. In this way, when the filling-valve element 40 presses down on the filling-valve seat 38 to close the filling valve 28, the filling-valve seat 38 yields downward. This softens the closing operation.

(37) The invention is not confined to the depicted embodiments but is capable of any variation within the protective scope of the following claims.