JPS62137496A - Liquefied gas pouring nozzle - Google Patents

Abstract

PURPOSE:To prevent the scattering of liquefied gas and to get a pouring nozzle giving little change in pouring quantity by forming, in a liquefied gas pouring nozzle, plural hollow chambers, upper parts of which facing a liquefied gas tank are opened and lower parts of which are closed in a taper form. CONSTITUTION:A liquefied gas pouring nozzle 6 is made of porous material and also has plural hollow chambers 7 whose upper parts facing a liquefied gas tank 1 are opened and whose lower parts are closed in a taper form. For this reason, falling liquefied gas is poured and scattered in hollow chambers 7 and thereby the falling pressure decreases and the falling speed becomes slow because the liquefied gas oozes from the porous wall of the hollow chamber 7, therefore it is made possible to prevent the liquefied gas from causing collective flow resulting in scattering or causing a change in falling quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquefied gas flow nozzle for filling a liquefied inert gas such as liquid nitrogen into a can.

Conventional technologyIn order to compensate for the lack of strength of cans made of thin materials,
Immediately before tightening the can lid, liquefied inert gas (hereinafter simply referred to as liquefied gas) such as liquid nitrogen is poured onto the contents of the can.

The liquefied gas flow-down device used for this purpose is equipped with a liquefied gas storage tank and a flow-down nozzle, and the size of the upper space inside the can changes depending on the temperature of the can filling, the line operating speed, and the serving size of the can filling. The container is filled with a fixed amount of liquefied gas depending on the occasion.

Conventionally, as the above-mentioned liquefied gas flow down device, one is known that completely pressurizes the inside of a liquefied gas storage tank and controls the amount of liquefied gas flowing out from a nozzle by adjusting the pressurizing force. However, in the case of pressurized tanks, the liquefied gas flowing down from the nozzle has a fast flow rate, so it collides with the liquid level of the filling inside the can and scatters outside the can, resulting in a large amount of loss and a lack of constant volume filling. was there. The response is poor when adjusting the pressurizing force according to the filling conditions such as countershaft and line speed.
Moreover, it was difficult to control the low pressure.

As one of the measures to eliminate such drawbacks, the present inventor first provided a porous pressure elimination nozzle in the lower part of the metered liquid outflow nozzle to temporarily remove the liquefied gas that was vigorously flowed out from the metered liquid outflow nozzle. A device was provided in which the ejection pressure was temporarily stored and the ejection pressure was extinguished, and the liquefied gas was discharged from the porous wall of the pressure elimination nozzle and was then filled into the can (Japanese Patent Publication No. 58-41759).

On the other hand, it is also proposed to make the liquefied gas storage tank open and provide multiple rows of discharge holes to reduce the amount of flow from each nozzle and reduce the impact force when it collides with the liquid level inside the can. (Japanese Unexamined Patent Application Publication No. 183419/1983, etc.).

Furthermore, it has been proposed that the flow rate Q+f can be rapidly controlled by changing the nozzle opening speed and line speed continuously according to changes in filling conditions (Japanese Patent Laid-Open No. 59-34
No. 099).

Problems to be Solved by the Invention The device equipped with the pressure elimination nozzle has a considerable effect in preventing the scattering of liquefied gas by reducing the collision force of the liquefied gas with the liquid surface in the can, but the line speed is high. When the flow rate increases in proportion to this, the mass of the liquid increases due to the single concentrated flow, and the scattering prevention effect tends to decrease.

In addition, if the tank is made open and has multiple discharge holes, it will reduce the amount of liquefied gas and will have a considerable scattering prevention effect, but adjusting the flow rate will require replacing the nozzle plate with a different hole opening degree, and changing the tank. This is done by changing the internal liquid level, so
It is technically difficult to control the line speed proportionally to changes during operation. Furthermore, if water droplets are scattered in the nozzle hole due to trouble, clogging will occur, but if even one hole is blocked, the amount of liquefied gas flowing down will be greatly affected, causing a problem in which the flow meter will change. .

The present invention has been devised in view of the above-mentioned circumstances, and even if the line is at high speed, the flowing mass and flowing velocity are small, effectively preventing the scattering of liquefied gas, and smoothing the flow in proportion to the line speed. To provide a liquefied gas flow down nozzle which allows for continuous flow rate change and in which the flow rate of liquefied gas does not change much even if part of the nozzle is clogged due to water droplets flying due to trouble. The purpose is to

Means for Solving the Problems Technical means for solving the above problems will be explained based on drawings corresponding to embodiments.

The present invention provides a liquefied gas flow down nozzle of a device for filling a container with liquefied inert gas immediately before sealing the container, which is formed of a porous material, and has an open upper part facing the liquefied gas tank and a tapered lower part. The liquid specific gas flow down nozzle 6 is configured to have a plurality of closed hollow chambers 7.

The liquefied gas flowing down rapidly from the working liquefied gas tank is dispersed and flowed down into the plurality of hollow chambers 7, and is temporarily stored in a hollow bank made of a porous material, so that the flowing pressure is extinguished. The temporarily stored liquefied gas oozes out from the porous wall surface of the hollow chamber 7 while being separated into gas and liquid, and flows down into the can from the tapered tip in the form of a thin thread. Therefore, since the liquid is allowed to flow down at a position close to the can, the flow rate during filling is slow, and since the liquid is divided into a plurality of hollow chambers and allowed to flow down, the mass of each downstream part is small. Further, the gas vaporized within the hollow bank is ejected from the upper porous wall surface of the hollow chamber, and does not form bubbles and become mixed into the liquefied gas.

Furthermore, since each hollow chamber of the porous nozzle has a small ratio of 1'1] to the total open area ratio during normal use, water droplets may scatter and clog some of the hollow chambers. In this case, the flow rate changes are small because the water leaks from the outer curved wall.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In the figure, 1 is an open storage tank for liquefied inert gas such as liquid nitrogen, and at the bottom of the tank is a needle valve mechanism 2 for discharging a fixed amount of the liquefied gas into cans moving downward. is provided. The valve mechanism 2 is
A needle 5 is moved up and down in a valve hole 4 provided in a valve seat 3 by an appropriate driving means such as a pulse motor (not shown) in response to changes in the conveyor speed for conveying canned goods or the line f+ of canned goods. The degree of opening of the valve hole 4 is adjusted to adjust the flow of the liquefied gas.

A downstream nozzle 6, which will be described below, is provided below the valve mechanism 2 with a slight gap. Downstream nozzle 6
It is made of a porous material such as sintered alloy or foamed urethane that allows ventilation and liquid permeability, and as shown in Figures 2 and 3, the upper part is open and the lower part is closed in a tapered shape. A plurality of hollow chambers 7 111g (three in the illustrated embodiment) are formed to hang down from the nozzle base 8. Also,
In order to uniformly disperse the liquefied gas flowing down from the valve mechanism 2 into each chamber 7, the center part of the base 8 of the downstream nozzle 6 is machined so that the processed portion 4 communicates with the opening of each chamber. being blown away.

In addition, 10 is a clamp nut which clamps the flow nozzle 6 to the lower part of the valve mechanism and prevents the vaporized gas from diffusing into the atmosphere so that the vaporized gas surrounds the flowing liquefied gas. It also plays the role of

Consisting of the above r configuration, the liquefied gas in the storage tank l is
The flow rate is controlled by the valve mechanism 2 according to changes in conditions such as line speed and can type, and the flow is discharged onto the cut 7Jf] 9 in the center of the flow nozzle 6. The liquefied gas discharged onto the cutting surface 9 is evenly distributed to each chamber 7 and flows down.
It is plated in the hollow chamber 7, loses the flow velocity when discharged from the valve, and is separated into gas and liquid, while it oozes out from the tip of each chamber 5 and flows down, forming a thin liquid stream into the canned can that is moving downward. Continuously supplied. - The vaporized gas blows out through the base 8 of the nozzle and the side wall of the chamber 7 and spreads into the clamp nand, enveloping the liquid flow from the chamber 7 and providing a shielding effect to prevent scattering and evaporation of the liquefied gas. Therefore, the vaporized gas does not become mixed into the liquefied gas as bubbles, so
The liquid can be filled into the can in a stable state without shaking.

In addition, in this embodiment, the liquefied gas flow down nozzle is provided at the bottom of the valve mechanism that continuously controls the discharge area according to changes in the line speed, so the flow of the liquefied gas is smooth and continuous in proportion to the line speed. It is possible to change the flow rate.

In addition, although the above embodiment describes the case where it is applied to an open storage tank, the liquefied gas flow down nozzle of the present invention receives a portion of the liquid discharged from the valve and causes it to ooze out. Since it is hardly affected by the discharge speed, it can be applied to both pressurized and open type storage tanks.

Effects The present invention achieves the following significant effects with the above configuration.

(b) Since the flow is divided from multiple hollow chambers and filled downstream, the flow rate of each flow can be made smaller, and as the line speeds up, the flow rate can be increased; even if the liquefied gas is It can reduce scattering.

(b) Porous nozzles have a small flow utilization ratio to the total pore area during normal use, so even if clogging occurs due to flying water droplets, the flow meter will not change much.

(c) Porous nozzle discharges from tank: f'L7
While receiving a portion of the liquefied gas and separating the air, it oozes out and flows down at a position close to the can, so the flow speed at the time of light evaporation is deenergized and slowed down, and the collision force against the internal surface of the can is reduced. is relaxed and there is less chance of liquid scattering. Since the liquid discharged from the tank is once received and temporarily fixed, the flow groove and flow rate from the nozzle are not affected much by pressure fluctuations in the tank.

Therefore, the liquefied gas flowing down nozzle of the present invention can be applied to either a pressurized or open type liquefied gas storage tank.

In the porous nozzle, the gas vaporized within the nozzle is ejected from the upper porous wall surface of the hollow chamber, resulting in gas-liquid separation. Therefore, since the liquefied gas does not become mixed with the liquefied gas in the form of bubbles, the flowing liquid can be stably filled into the can without disturbing the flowing liquid flow.

(e) When the liquefied gas flow nozzle of the present invention is used in combination with an opening-adjustable flow valve, smooth and continuous flow rate changes can be made in proportion to the line speed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of the flow valve in a state where it is attached to the lower part, FIG. 2 is a 100-sided view of the liquefied gas flow nozzle, and FIG. FIG. 1: Liquefied gas storage tank 2: Valve mechanism 6: Liquefied gas flow down nozzle 7: Hollow chamber 8: Nozzle base 9: Cutting surface Patent applicant Toyo Seikan Co., Ltd. Patent attorney Fumi Sato (et al.) 2
given name)

Claims (1)

[Scope of Claims] 1) A liquefied gas flow nozzle of a device for filling a container with liquefied inert gas in a flowing manner immediately before sealing the container, which is formed of a porous material, has an open upper part facing the liquefied gas tank, and a lower part facing the liquefied gas tank. A liquefied gas flowing down nozzle characterized by having a plurality of hollow chambers closed in a tapered shape. 2) The liquefied gas flow nozzle according to claim 1, wherein the nozzle is provided at a lower part of a valve mechanism that continuously controls the flow rate of the liquefied gas. 3) The liquefied gas flowing down nozzle according to claim 1 or 2, wherein a central portion of the upper surface of the nozzle communicating with the hollow chamber opening is a cut surface.