JPH0659888B2 - Downflow nozzle device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a downflow nozzle device for downflowing and filling a liquid such as a liquefied inert gas into a container such as a canned can.

Conventional technology Conventionally, in order to compensate for the lack of strength of a can made of a thin material or to prevent the deterioration of the contents of the can, just before the can lid is closed, liquefied inert gas such as liquid nitrogen (hereinafter simply liquefied). It is performed by adding a certain amount of gas) into a can and sealing it.

The liquefied gas addition device used for this is a lower part of the liquefied gas addition device in which the liquefied gas is caused to flow continuously or intermittently from a downflow nozzle provided at the bottom of a liquefied gas storage tank which is pressurized or is in communication with the atmosphere. Is added in a fixed amount in cans that are continuously conveyed by a conveyor. Recently, in order to quantitatively add the liquefied gas into the can, a valve whose opening amount can be changed is adopted, and the opening amount is controlled according to the conveyor speed so that the liquefied gas can flow down at a predetermined flow rate. ing.

However, since the liquefied gas is caused to flow vertically down into the moving can, the impact on the contents of the can during impact is large, and the impact causes the liquefied gas to scatter and vaporize or jump out of the can. As a result, not only is there a large loss of liquefied gas, but there is also a problem that the fixed internal pressure cannot be obtained due to lack of quantitative supply. The phenomenon becomes more remarkable as the flow rate and the flow rate of the liquefied gas flowing down from the flow nozzle increase.

As a measure to eliminate such a phenomenon, conventionally, a porous pressure erasing nozzle is provided below the fixed amount outflow nozzle so that the liquefied gas flowing down from the fixed amount outflow nozzle is temporarily stored and the flow down pressure is deenergized. (For example, Japanese Patent Publication No. 58-4
No. 9759), or one in which the nozzle hole is inclined so that the gas flowing down from the nozzle has a velocity component in the traveling direction of the can (JP-A-58-193222).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in recent years, in order to increase the speed of a canned food production line and proportionally increase the flow rate of liquefied gas per unit time from a nozzle, the flow-down mass or flow-down speed is increasing. As a result, the impact force on the contents of the can at the time of collision becomes large, and it is becoming impossible to sufficiently prevent the scattering by the conventional means.

In order to solve the above problem, the present inventor has provided a pressure erasing nozzle made of a porous material below a downflow valve, and further down below it, a downflow direction conversion nozzle for deflecting a liquefied gas flow in a traveling direction of a container. (Japanese Patent Application No. 60-282881). According to the patent application, even if the flow rate of the liquefied gas per unit time increases and the line speed increases, the impact force at the time of collision with the contents of the can is mitigated to prevent the liquefied gas from scattering, and the gas-liquid The separation can be sufficiently performed, and a fixed amount of liquefied gas can be added stably, which has a considerable effect. However, since the device is caused to flow down through the pressure erasing nozzle made of a porous material, there is a problem that the responsiveness of changing the flow down amount according to the valve opening degree is slightly inferior.

The present invention has been made to further improve the above-mentioned prior invention to solve the problems of the above-mentioned prior art, and the object thereof is to provide a pressure erasing nozzle as described above, The impact force at the time of collision with the contents of the can is mitigated to prevent the liquefied gas from scattering and the gas-liquid separation can be sufficiently performed, so that a constant amount of liquefied gas can be added even when the canning production line is operating at high speed. It is possible to provide a downflow nozzle capable of achieving the downflow response that is promptly responded to the valve opening.

Means for Solving Problems The configuration of the present invention will be described below with reference to the drawings corresponding to the first embodiment.

The downflow nozzle device of the present invention is a downflow nozzle device for deactivating the vertical downflow liquid flow from the liquid storage device and flowing down into the container, wherein the vertical downflow liquid flow is received by the inner peripheral wall of the funnel hole 4. It is characterized by comprising a funnel 1 for deflecting from a vertical direction and a direction changing nozzle 2 for changing the direction of the deflected liquid flow so as to have a velocity component in the same direction as the traveling direction of the container.

The liquid flowing down from the working liquid storage device with its flow rate controlled by the downflow valve hits the inner peripheral wall surface of the funnel 1, deflects the downflow direction, and along the wall surface, the flow velocity is deenergized and the direction changing nozzle. It is flowed down so as to hit the wall surface of the second nozzle hole 7. The liquid flowing down from the funnel 1 is further depressed by the flow velocity by hitting the wall surface of the nozzle hole 7, flows down along the nozzle hole 7 of the direction changing nozzle 2, and is added into the container. At that time, due to the inclination of the nozzle hole 7, a component in the container advancing direction is imparted, and the relative speed difference with the container being conveyed can be reduced. As a result, the impact force when the liquid flow collides with the surface of the container contents is mitigated, and the liquid is prevented from scattering. Also,
Since the liquid flow from the downflow valve 3 is allowed to directly flow down, it is possible to immediately respond to the flow rate control of the downflow valve.

Further, by enlarging the nozzle hole inlet portion of the direction changing nozzle to provide a chamber, the flow velocity can be further depressed, and a plurality of nozzle holes are provided from the chamber so that the nozzles from each nozzle are provided. The amount of flow can be reduced, and the impact can be further mitigated.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The downflow nozzle device of the present invention has a funnel 1 as shown in FIG.
And the direction changing nozzle 2. Funnel 1 is
The vertical liquefied gas flow from the downflow valve 3 is received by its inner wall surface, and the downward direction thereof is given a velocity component in the direction opposite to the traveling direction A of the container (not shown) for adding the liquefied gas. As shown in FIG. 3, the funnel hole 4 is eccentrically formed near the rear in the traveling direction A.

The direction change nozzle 2 further converts the liquefied gas flow from the funnel 1 in the opposite direction, and imparts a velocity component in the same direction as the traveling direction A of the container so that the nozzle hole 7 flows downward. It is provided so as to be inclined toward the traveling direction. The flow-out port 8 is enlarged to have a slightly larger diameter as shown in the drawing. The nozzle hole 7 may have any shape such as a circle, a square, a rhombus, and a triangle, but if the rhombus is used, the converging property of the falling liquid flow can be further maintained.

In addition, the direction changing nozzle 2 is provided with a heater 9 and is heated in order to prevent frost formation and to improve drainage when the flow-down valve 3 is closed. Reference numeral 10 is a screw mounting hole for fixing the flow-down valve device to a liquefied gas tank machine frame or the like.

As shown in FIG. 1, the funnel 1 and the deflection conversion nozzle 2 configured as described above are integrally assembled by a suitable fixing means such as a screw so that the funnel hole 4 and the nozzle hole 7 communicate with each other. In the present embodiment, the funnel 1 is attached and fixed to the direction changing nozzle 2, but the funnel 1 and the direction changing nozzle 2 may be separated and separately attached to the tank machine frame.

The operation of adding the liquefied gas into the container which is being conveyed downward by the downflow nozzle device having the above configuration will be described below.

The liquefied gas whose flow rate is controlled by the flow-down valve 3 hits the inner wall surface of the funnel hole of the funnel 1 and is given a velocity component in the direction opposite to the container traveling direction A along the wall surface to quench the flow velocity. It is urged and flows down so as to hit the wall surface of the nozzle hole 7 of the direction changing nozzle 2. The liquefied gas that has flowed down from the funnel 1 is further depressed by the flow velocity by hitting the wall surface of the nozzle hole 7, flows down along the nozzle hole 7 of the direction changing nozzle 2, and is added into the container. At that time, since the container advancing direction component is given by the inclination of the nozzle hole 7,
Since the velocity component in the direction of travel of the container upon reaching the liquid level in the content of the container gradually disappears as the container advances, the impact at the time of collision of the content with the liquid level is mitigated accordingly, and the liquid can be prevented from scattering. In particular, in this embodiment, since the vertical downflowing liquid flow from the downflow valve is converted into a two-fold shape as shown in FIG. 1, the flow velocity is further deenergized and the pressure deenergizing nozzle is operated. Even if it is not provided, it can be added to the container with reduced impact upon impact. Further, since the pressure deenergizing nozzle is not provided on the way, the responsiveness to the opening and closing of the downflow valve and the change of the flow rate is good.

Further, the vaporized gas vaporized in the falling funnel and in the direction changing nozzle escapes to the atmosphere through the nozzle hole 7. Therefore, gas-liquid separation is favorably performed, and the vaporized gas does not exist as bubbles in the liquid flow and flows down in a stable state. Moreover, the nozzle hole 7 of the downflow direction conversion nozzle 2
At the enlarged flow-down port 8 at the tip of the, the periphery of the liquid flow through which the vaporized gas flows down is shielded to prevent the vaporized gas from being vaporized. Note that, in FIG. 1, broken line arrows indicate the flow of vaporized gas.

Further, the downflow direction conversion nozzle 2 is heated to almost room temperature by the heater 9 and prevents frost from adhering to the peripheral portion of the downflow port 8.

4 and 5 respectively show other embodiments of the downflow direction conversion nozzle.

The downflow direction conversion nozzles 12 and 15 shown in FIGS. 4 and 5 are provided with chambers 14 and 15 by enlarging the inlets of the nozzle holes 13 and 16 as shown. As a result, the liquid flow from the funnel 1 flows down along the inner peripheral walls and the bottom surfaces of the chambers 14 and 15, is reversed at the inner peripheral walls, is diffused at the bottom surfaces, and the flow velocity is further deactivated. And gas-liquid separation is also performed more effectively. Further, by providing a chamber, as shown in FIG. 5, it is possible to provide a plurality of nozzle holes 16, 16 ... As a result, the amount of flow down from each nozzle hole can be reduced, so that the scattering prevention effect can be further enhanced.

Further, when a net-like body, for example, a wire net of about 30 to 50 mesh is laid on the bottom surfaces of the chambers 14 and 15 or at a position slightly apart from the bottom surfaces, the liquid flow can be further weakened to greatly improve the deenergizing effect. . At the same time, even if the amount of liquid from the flow-down valve is changed from zero to the maximum, the liquid can be distributed almost evenly to the nozzle holes by the mesh body.

Although the respective embodiments have been described with respect to the case where the liquefied gas flows down into the container, it goes without saying that the present invention can be applied not only to the liquefied gas but also to a general liquid flow-down nozzle.

Effect As is apparent from the above description, the present invention diverts the falling liquid flow in opposite directions by the funnel and the velocity conversion nozzle, and deactivates the flow velocity further without providing the pressure elimination nozzle. It can be done. Further, since the downflowing liquid flow is given a velocity component in the container conveying direction by the direction changing nozzle, the velocity component in the container conveying direction when the liquid level in the container is reached is lost as the container advances, and its liquid level collision The impact force at the time can be eased.

Further, since the pressure erasing nozzle is not provided on the way, the response of the falling liquid flow to the opening / closing of the falling valve and the change of the opening amount is good.

Then, the vaporized gas vaporized in the middle escapes well, and the vaporized gas does not coexist in the liquid flow, so that the liquefied gas flows down in a stable state. Moreover, the vaporized gas shields the periphery of the liquid flow to prevent vaporization of the liquefied gas.

As described above, according to the present invention, as compared with the conventional one, the liquefied gas is scattered less and the response is made to flow down into the container, so that the quantitative addition accuracy can be remarkably improved.

[Brief description of drawings]

The drawings show an embodiment of the downflow nozzle device of the present invention. FIG. 1 is a side sectional view thereof, FIG. 2 is a plan view of a funnel, FIG. 3 is a side sectional view thereof, and FIG. FIG. 5 is a side sectional view of another embodiment of the nozzle, and FIG. 5 is a side sectional view of still another embodiment of the direction changing nozzle. 1: Funnel, 2, 12, 15: Direction changing nozzle, 3: Downflow valve device, 4: Funnel hole, 7, 13, 16: Nozzle hole,
14, 15: Chamber

Claims (4)

[Claims] 1. A down-flow nozzle device for deactivating a vertical down-flow liquid flow from a liquid storage device to flow down into a container, wherein the vertical down-flow liquid flow is received by an inner peripheral wall of a funnel hole and deflected from a vertical direction. A downflow nozzle device comprising: a funnel for changing the direction and a direction changing nozzle for changing the direction of the deflected liquid flow so as to have a velocity component in the same direction as the traveling direction of the container. 2. The downflow nozzle device according to claim 1, wherein an upper opening portion of the direction changing nozzle is enlarged to form a chamber. 3. The downflow nozzle device according to claim 2, wherein a plurality of nozzle holes are provided from the chamber. 4. The downflow nozzle device according to claim 2 or 3, wherein a net-like member is laid inside the chamber.