JPS6159996B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in counterpressure liquid fill valves.

Conventionally, in back pressure type liquid filling valves, pressurized gas higher than the counter pressure of the filling tank is introduced from the pressurized gas chamber into the container via the on-off valve to prevent splashing liquid from the vent tube and to prevent high concentration liquid filling. In order to improve the accuracy of filling under pressure gas and seasoning, the inside of the container was pressurized again after filling to push the liquid in the vent tube back into the filling tank.
This method is known from Japanese Patent Publication No. 4515 and Japanese Patent Application Laid-Open No. 131483, etc., but since the pressure in the tank fluctuates depending on the displacement of the liquid level and supply/discharge of the tank counter pressure, etc. When using a check valve that uses a pressure difference, the degree of opening of the check valve is not constant, and especially when the pressure difference is small, this can cause opening failure and make it impossible to reliably push excess liquid back into the filling tank. , the venting effect in the next filling operation will be reduced and the filling speed will be delayed, and if the pressure difference is too large, excess pressurized gas will be released, and the gas returned from inside the container will be mixed with air. This is particularly unsuitable for liquids that easily oxidize, such as beer, as this enters the filling tank, and direct entry of outside air is undesirable from a sanitary standpoint.

The present invention has been made to improve these deficiencies, and the filling liquid in the fixed filling liquid tank is supplied to the side of the rotating filling valve via a distributor, and the upper end of the filling valve is connected to the filling liquid tank. It is connected to the tank counterpressure chamber formed in the inner upper part via the top counter channel, and furthermore, pressurized gas higher than the pressure in the tank counterpressure chamber is supplied to the lower part of the flow valve of the filling valve via the precounter channel. In a counter pressure type liquid filling machine equipped with a pre-counter valve for supplying water, a valve stem having a flow valve at the lower part and a vent passage in the center is supported in the casing of the filling valve so as to be vertically movable, The upper part of the vent valve, which is inserted into the upper part of the valve stem so that it can be opened and closed, is inserted into a pull-down cap member operated by an outer lever pivoted on the filling valve, and the vent valve is inserted downward between the vent valve and the pull-down cap member. A flow valve seal spring is interposed between the pull-down cap member and the valve stem to bias the valve stem downward, and the valve stem is further biased upward. The gist of this is to provide a valve spring that is weaker than the flow valve seal spring.

An embodiment of the present invention will be described with reference to the drawings. A rotating disk 2 having a casing 1 fixed to its circumferential side is provided with an annular distributor 3 in its center that can be filled with a filling liquid. It is connected to a substantially central portion of the casing 1 through a conduit 4 .

Further, a valve base body 6 having a seal member 5 on the lower end surface is fixed to the lower part of the casing 1, and a valve stem 9 having a flow valve 7 and a spreader 8 at the lower part is attached to a support ring 10 and an umbrella. It is supported by a mold stopper 11 so as to be vertically movable.

A snift hole 12 and a pressurized gas introduction hole 1 are provided on the side of the valve base 6 in the lower part of the flow valve 7.
3, the snift hole 12 is connected to an annular snift channel 16 at the center of the rotating disk via a snift valve 14 and a conduit 15, and the pressurized gas introduction hole 13 is connected to a pre-counter valve 17 and a conduit 15. 18 to the annular pre-counter channel 19 at the center of the rotating disk.
is connected to.

Further, a vent valve 21 is fitted into the upper part of the vent passage 20 extending through the center of the valve stem 9 so as to be openable and closable. A flow valve seal spring 25 is fitted into the pull-down cap member 23 and urged downward by a spring 24, and is tensioned between the pull-down cap member 23 and the valve stem 9 to urge the valve stem 9 downward. Furthermore, the flow valve seal spring 25 is attached to the valve stem 9 and urges the valve stem 9 upward.
A weaker valve spring 26 is tensioned.

A Y-shaped lever 28 provided on a lever shaft 27 pivotally supported on the upper part of the casing 1 engages with the upper end engaging portion 22 of the pull-down cap member 23, and an outer lever provided on the outer end of the lever shaft 27 engages with the upper end engaging portion 22 of the pull-down cap member 23. 2
The upper end of the casing 1 is connected by a conduit 30 to an annular top counter channel 31 above the center of the rotary disk, and the top counter channel 31 connects an exhaust valve 32 to the top counter channel 31 . It is connected to the atmosphere through

Accordingly, the sniff channel 16, the pre-counter channel 19 and the top counter channel 31 have rotary joints 33,
A snift recovery tank is formed to rotate integrally with the rotating disk 2 via 34 and 35, and the snift channel 16 communicates with the atmosphere outside the filling chamber via a conduit 36, a central cylinder 37, and a conduit 38. 3
9, and the precounter channel 19 is connected via a conduit 40, an upper central tube 41, and a conduit 42 to a counterpressure supply device, not shown.

The distributor 3 also includes a lower central pipe 45 at the lower part of a fixed filling liquid tank 44 which forms a tank counter pressure chamber 43 in the upper part and is controlled so that the liquid level is located higher than the distributor. The tank counterpressure chamber 43 of the fill liquid tank 44 is connected via a conduit 46 and the tank counterpressure chamber 43 of the fill liquid tank 44 is connected to the top counter channel 31 via a conduit 47, an upper center tube 48 and a conduit 49, room 4
3 and the conduit 42 are connected by a conduit 53 having a pressure reducing valve 50, a check valve 51, and a counter air supply valve 52.

The snift valve 14, the pre-counter valve 17, and the outer lever 29 are all operated by cams (not shown).

Since the embodiment of the present invention is constructed as described above, when the container to be filled comes into contact with the sealing member 5 and is sealed, the pre-counter valve 17 is first opened and a pressure higher than the pressure in the tank counterpressure chamber 43 is applied. At the same time that the pressurized gas is supplied into the container, the sniff valve 14 is also opened, and the air in the container is exhausted to the atmosphere from the recovery tank 39 outside the filling chamber through the sniff channel 16 to perform pre-gassing, and then the pre-counter valve 17 and the sniff valve are opened. 14 closes.

Next, the pre-counter valve 17 is activated and opened again to supply pressurized gas into the container, and then the outer lever 29 is activated and the Y-shaped lever 28 pulls up the pull-down cap member 23 and opens the vent valve 21, which increases the pressure inside the container. Pressure gas flows from the vent passage 20 to the upper part of the casing 1, and the upper part of the casing 1 is connected to the conduit 3.
0, top counter channel 31, rotary joint 35, upper center cylinder 48 and conduit 47
Since it communicates with the tank counterpressure chamber 43 of the filling liquid tank 44 through the container, the pressure inside the container instantly becomes the same as that of the filling liquid tank 44.

Next, the flow valve 7 opens as the valve stem 9 is pulled upward by the spring 26 to start filling the container, and as the filling liquid flows down, the pressurized gas in the container is released until the conduit 49 is closed by the rotary joint 35. Therefore, the air is discharged from the vent passage 20 through the conduit 30, the top counter channel 31, and the exhaust valve 32.

However, at this point, the flow valve seal spring 25 is held in a free state.

In this way, the filling liquid is filled into the container, and the liquid level rises and reaches approximately the lower surface of the vent tip 9' at the lower end of the valve stem 9, forming a seasoning line. Filling stops when the level of the liquid in tank 44 is reached.

Then, the outer lever 29 lowers the pull-down cap member 23, and only the flow valve 7 is closed by the flow valve seal spring 25. Then, the pre-counter valve 17 is activated again and opens, allowing pressurized gas from the pre-counter channel 16 to fill the container. After pressurizing the vent tip 9' and pushing the excess liquid from the upper part through the vent passage 20 back to the upper part of the casing 1, the pre-counter valve 17 is closed and the vent valve 21 is also closed.Finally, the sniff valve 14 is activated to open and drain the inside of the container. The filling operation is completed by venting to the atmosphere through the snift channel 16 and the snift recovery tank 39, and the container is separated from the sealing member 5.

The present invention can, of course, prevent liquid splashes from the vent passage and improve filling accuracy in a back-pressure liquid filling machine that supplies high-concentration pressurized gas to fill containers, similar to the conventional check valve system. In particular, instead of using the conventional check valve method, a flow valve seal spring is provided between the pull-down cap member of the filling valve and the valve stem, so that the vent valve closes after the flow valve closes, and the flow valve closes after the vent valve opens. I made it open, so
It reliably prevents the delay in filling speed due to the undefined opening degree and the release of excess gas due to pressure differences, which are defects of the check valve system, and enables high-accuracy, high-speed filling.At the same time, it is possible to return air mixed with air from inside the container. It has excellent features that have not been seen before, such as being suitable for filling easily oxidized liquids such as beer because gas does not enter the filling liquid tank, and being sanitary as outside air does not enter the filling liquid tank. have

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention, and FIG.
The figure is a longitudinal sectional front view of the same main part. 1...Casing, 3...Distributor, 7
...Flow valve, 9...Valve stem, 17...Pre-counter valve, 19...Pre-counter channel, 20...Vent passage, 21...Vent valve,
23...Pull-down cap member, 24...Spring, 25...Flow valve seal spring, 26
...Valve spring, 29...Outer lever, 3
1... Top counter channel, 43... Tank counter pressure chamber, 44... Filling liquid tank.

Claims (1)

[Claims] 1. The filling liquid in the fixed filling liquid tank is supplied to the side of the rotating filling valve via a distributor, and the upper end of the filling valve is connected to a tank counterpressure chamber formed in the upper part of the filling liquid tank. A counter-pressure liquid filling machine that is connected via a counter channel and is further equipped with a pre-counter valve below the flow valve of the filling valve that supplies pressurized gas higher than the pressure in the tank counter pressure chamber via the pre-counter channel. In the casing of the filling valve, a valve stem having a flow valve in the lower part and a vent passage bored in the center is supported so as to be movable up and down, and the upper part of the vent valve is inserted into the upper part of the valve stem so as to be openable and closable. is inserted into a pull-down cap member operated by an outer lever pivoted to the filling valve, and a spring is interposed between the vent valve and the pull-down cap member to bias the vent valve downward, and the pull-down cap member A flow valve seal spring that urges the valve stem downward is interposed between the valve stem and the valve stem, and the valve stem is further provided with a valve spring that is weaker than the flow valve seal spring that urges the valve stem upward. filling machine.