filling machines and blow machine

filling machines and blow machine

filling machines and blow machine

A filling machine assembly for filling a container with a fluid material. The assembly comprises a support housing having an upper surface and a lower surface defining an inner fluid chamber for supplying the fluid material to be discharged into the container. A valve housing is mounted to the lower surface of the support housing for controlling the discharge of the fluid material. A control device is mounted to the upper surface of the support housing. A vent tube has a first end disposed within the control device and a second end extending into the valve housing. A support tube defines a through bore extending between the control device and the valve housing and surrounds the vent tube. An actuation device moves the vent tube within the bore relative to the support tube a predetermined stroke between a blow machine and a non-use position. An upper tube seal is in sealing engagement between the control device and the first end of the vent tube with the bore of the support tube open to the upper seal. A lower tube seal is in sealing engagement between the support tube and the second end of the vent tube to seal the bore of the support tube between the upper and lower seals. The assembly is characterized by a chamber sealing mechanism for selectively sealing the bore between the upper and lower tube seals from the inner fluid chamber to equalize operating pressures against the upper and lower tube seals during the movement of the vent tube between the filling and non-use positions.

The beverage filling machines industry continuously strives for machinery and methods which facilitate rapid, economical, efficient, and sterile filling of containers. As discussed above, methods and apparatuses for filling containers with carbonated liquids have evolved into counter pressure filling machines. These counter pressure filling machines typically operate under relatively high pressures. Many of the components of the filling machine are susceptible to excessive wear and damage from the pressures created within the inner fluid chamber. One such component is the vent tube which, as discussed above, moves in and out of the container during the filling operation. As appreciated, the vent tube is sealed from certain parts of the filling machine to effectuate its operation. These tube seals can experience significant pressure differentials which can significantly reduce the operating life of the seals. Accordingly, it is desirable to maintain substantially equal operating pressures on both sides of the tube seals during the movement of the vent tube.

Filling machines used for filling containers, such as cans, jars, or bottles, with a beverage, such as carbonated drinks, juices, water or the like, as are well known in the art. Conventional filling mechanisms feed the containers into a star wheel conveyor which individually positions each container on a rotating turntable below a valve assembly of an individual filling machine. The container moves into sealing engagement with the valve assembly by either moving the container upwardly or by lowering the valve assembly. Modern filling machines are known in the art as counter pressure filling machines as is discussed below. There may be as many as 120 individual blow machine disposed circumferentially around the turntable. The filling machines typically include a support housing having an inner fluid chamber or ring bowl disposed above the valve assembly. The ring bowl is usually annular and contains the liquid or beverage for filling the containers and has a space above the liquid for a pressurized inert gas such as carbon dioxide or nitrogen. This space above the liquid is known as the headspace. A common storage tank or reservoir feeds the ring bowl with the required liquid and gas.

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