JPH0329641B2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is applicable to liquid foods, especially fresh cream,
This invention relates to a liquid filling nozzle used to fill a container with a fixed amount of a highly viscous liquid such as yogurt.

Conventional technology This type of liquid filling nozzle is known, for example, from Japanese Patent Laid-Open No.
As disclosed in Japanese Patent No. 57-107472, a cylindrical nozzle body, an elastic body disposed at a lower end opening of the cylindrical nozzle body so as to surround a liquid passage;
The elastic body is formed into a hollow donut shape, consisting of a holding member that holds the elastic body, and a means for supplying pressurized fluid to the elastic body so as to expand the elastic body and close the liquid passage. It has been known.

Problems to be Solved by the Invention In the conventional liquid filling nozzle described above, when the elastic body is to be expanded, since the elastic body is formed in a hollow donut shape, the elastic body not only expands inwardly, but also expands inwardly. It also expands downward. In order to close the fluid passage, downward expansion of the elastic body is not only unnecessary and wasteful, but also the sealing pressure generated when the elastic bodies come into contact with each other is not necessarily sufficient, and there is a risk of seal failure. Further, the elastic body is arranged in the nozzle body so as to narrow the fluid passage, and the elastic body acts as passage resistance. In this case, the filling liquid may be agitated and a phenomenon such as a churning phenomenon may occur.

An object of the present invention is to provide a liquid filling nozzle that solves the above problems.

Means for Solving the Problems A liquid filling nozzle according to the present invention is based on the above conventional liquid filling nozzle, but instead of the elastic body being formed in a hollow donut shape, the elastic body is formed in a short cylindrical shape. , the upper and lower ends of the elastic body are each fixed to a holding member, an annular pressurized fluid chamber is formed on the outside of the elastic body along the outer peripheral surface of the elastic body, and the cross-sectional area of the elastic body is larger than the nozzle body at the upper end. It is characterized by being formed to match the opening area of the lower end and to gradually increase in size from the upper end to the lower end.

Function In the liquid filling nozzle according to the present invention, the elastic body is formed into a short cylindrical shape, the upper and lower ends of the elastic body are respectively fixed to the holding member, and an annular ring is formed on the outside of the elastic body along the outer peripheral surface of the elastic body. Since the pressurized fluid chamber is formed, when pressurized fluid is supplied to the pressurized fluid chamber, the elastic body does not expand downward, but expands only inward.

Further, since the cross-sectional area of the elastic body is formed to match the opening area of the lower end of the nozzle body at the upper end and gradually increase from the upper end to the lower end, the elastic body does not become a passage resistance.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The liquid filling nozzle includes a cylindrical nozzle body 11, an elastic body 13 disposed at the lower end opening of the cylindrical nozzle body 11 so as to surround a liquid passage 12, and a holding member 14 holding the elastic body 13. and elastic body 13
The elastic body 13 is configured to supply pressurized fluid to the elastic body 13 so as to expand the elastic body 13 and close the liquid passage 12.

The cylindrical nozzle body 11 includes an upper member 21, an intermediate member 22, and a lower member 23. An outward flange 24 is provided at the upper end of the outer peripheral surface of the upper member 21, and an inward flange of a flange nut 25 is engaged with this.
By fitting this nut 25 into the filling machine main body (not shown), the liquid filling nozzle is attached to and removed from the filling machine main body. Further, an O-ring groove 26 is formed on the upper surface of the collar 24.

A collar 27 is provided at the middle of the height of the inner peripheral surface of the upper member 21, and a ring 28 is fitted at a distance above the collar 27. A working fluid supply port 31 and a working fluid overflow confirmation port 32 are opened in the radial direction so as to communicate between the collar 27 and the ring 28. Unions 3 are provided at the open ends of both ports 31 and 32, respectively.
3 is screwed in. The intermediate member 22 has a double structure consisting of concentric inner and outer tubes 34 and 35, which prevents condensation during filling. The upper end of the inner tube 34 reaches the tip of the ring 28, thereby forming an annular upper pressurized fluid passage 36 between the collar 27 and the ring 28. Two pressurized fluid pipes 37 are arranged between the inner and outer pipes 34 and 35. The upper end of the pressurized fluid 37 passes through the collar 27 and communicates with the upper pressurized fluid passage 36 . Two communication passages 38 are opened in the lower member 23 in the axial direction so as to communicate with the lower ends of both pressurized fluid pipes 37. A male thread 41 is provided on the outer peripheral surface of the lower member 23, and a square nut 42 is fitted into this thread. A pair of horizontal fitting grooves 43 are provided at the lower ends of two parallel sides of the nut 42 .

The elastic body 13 is formed of food rubber into a short cylindrical shape, and a rectangular outward flange 44 is integrally provided at the lower end. The upper end opening of the elastic body 13 has the same circular shape as the lower end opening of the lower member 23, but the lower end opening of the elastic body 13 has a modified oval shape. The cross-sectional area of the elastic body 13 is formed so that its upper end matches the lower end opening area of the lower member 23 and gradually increases from the upper end to the lower end.
A rising portion 45 having an inverted U-shaped cross section is provided at the upper end of the elastic body 13, and an upwardly bent edge portion 46 is provided at the tip of the flange 44.

The holding member 14 is a rectangular cylinder with a rectangular cross section, and an inward flange 47 is integrally provided at the upper end. The flange 47 is provided with a communication hole 48 that corresponds to the communication path 38 . Flange 4
7 is provided with an upwardly bent edge 49 that is fitted into and fixed to the rising portion 45. A step portion 51 is provided at the lower end of the holding member 14, and an upwardly bent edge 46 of the elastic body 13 is provided on the step portion 51.
is applied and fixed.

The elastic body 13 and the holding member 14 are combined with each other as described above, and as a result, the pressurized fluid chamber 5 is formed inside the elastic body 13 and the holding member 14.
2 is formed into a hollow rectangular cylinder. Elastic body 1
3 is disposed such that its upper end is connected to the lower end opening of the lower member 23, and is attached to the lower member 23 together with the holding member 14 by a rectangular cylinder 53. A fitting groove 43 of the lower member 23 is provided at the upper end of the square cylinder 53.
A pair of protrusions 54 are provided which are fitted into the ridges.

A packing 55 is interposed between the flange 47 of the holding member 14 and the lower end of the lower member 23.
An annular lower pressurized fluid passage 56 is formed inside the casing 5 .

When the working fluid is supplied to the working fluid supply port 31, the working fluid is supplied to the pressurized fluid chamber 52 through the upper pressurized fluid passage 36, the pressurized fluid pipe 37, the communication passage 38, the lower pressurized fluid passage 56, and the communication hole 48. The elastic body 13 expands from the state shown by the solid line in FIG. 1 to the state shown by the chain line. As a result, the fluid passage 12 continuing to the lower end opening of the nozzle body 11 is closed. Then, when the supply of the working fluid is stopped and the working fluid is discharged from the pressurized fluid chamber 52, the above-mentioned elastic body 13 contracts to the original state shown by the solid line.
2 is released.

When discharging the working fluid, it may be directly exposed to the atmosphere, or it may be forcibly sucked in using a vacuum pump or the like. As the working fluid, air, water, oil, etc. can be selected and used as appropriate.

Effects of the Invention According to this invention, when pressurized fluid is supplied to the pressurized fluid chamber, the elastic body does not expand downward;
Since it expands only inward, the sealing pressure caused by the expansion action of the elastic body can be effectively utilized.

In addition, since the elastic body does not cause passage resistance, there is no fear that the filling liquid will be stirred and a churning phenomenon will occur, and the filling operation can be carried out efficiently.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, FIG. 1 being a vertical sectional view and FIG. 2 being a bottom view. 11...Nozzle body, 12...Liquid passage, 13
...Elastic body, 14... Holding member, 52... Pressurized fluid chamber.

Claims (1)

[Claims] 1. Cylindrical nozzle body 11 and cylindrical nozzle body 11
An elastic body 13 is disposed at the lower end opening to surround the liquid passage 12, and a holding member 14 holding the elastic body 3 is arranged to inflate the elastic body 13 to close the liquid passage 12. In a liquid filling nozzle which is a means for supplying pressurized fluid to an elastic body 13, the elastic body 13 is formed in a short cylindrical shape, the upper end and the lower end of the elastic body 13 are respectively fixed to a holding member 14, and the elastic body 13 is fixed to a holding member 14. An annular pressurized fluid chamber 52 is formed on the outside along the outer peripheral surface of the elastic body 13, and the cross-sectional area of the elastic body 13 is equal to the nozzle body 11 at the upper end.
A liquid filling nozzle, characterized in that the liquid filling nozzle is formed so as to match the opening area of the lower end thereof and to gradually increase in size from the upper end to the lower end.