JP6524641B2 - Liquefied gas injection unit - Google Patents

Description

  The present invention is a valve mechanism for controlling supply of liquefied gas to a spray nozzle and a spray nozzle, which is used for a liquefied gas spray apparatus for spraying and filling liquefied gas such as liquid nitrogen into a container in the production of positive pressure cans and the like The present invention relates to a liquefied gas injection unit having

Conventionally, a liquefied gas such as liquid nitrogen is made to flow down from a nozzle into a container such as a can and filled, thereby performing gas substitution and generating an internal pressure to obtain a gas-substituted positive pressure package such as a positive pressure can. Is widely practiced.
However, if liquefied gas is allowed to directly flow and be filled, some of the liquefied gas flowing down into the container may be scattered out of the can at the time of collision with the liquid level, and the gas remaining in the container at the time of sealing. There is a problem that the variation of the amount is large and the internal pressure accuracy is low.
In particular, when a small amount of liquefied gas is filled, the variation with respect to the target filling amount is further increased, so that a low positive pressure gas replacement package can be stably obtained by filling a small amount of liquefied gas in the conventional downflow filling. It was not.
Therefore, the present applicant has proposed a liquefied gas injection unit for injecting liquefied gas in the form of a mist and filling the container in order to eliminate the drawbacks of the conventional liquefied gas flow downward filling and enhance the filling accuracy (for example, Patent Document 1) Etc.).
Furthermore, the injection nozzle has a velocity component in the traveling direction of the container so that the jet flow of the liquefied gas can accurately fill the container with the fine particles of the liquefied gas injected even in a high-speed line. A liquefied gas injection unit has been proposed in which the liquefied gas is injected at a predetermined angle from the vertically downward direction with respect to the progress of the container (see, for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 11-43110 Japanese Patent Laid-Open No. 2000-128122

However, as shown in FIG. 5, in the known liquefied gas injection unit 500 in which the injection nozzle 510 is inclined, the supply of the liquefied gas to the injection nozzle 510 is controlled by turning the injection nozzle 510 on and off. Between the valve mechanism 520 including the valve 521 and the valve seat 522 and the injection nozzle 510, there always exists a supply path R for liquefied gas.
When the filling line of the container stops, the valve 521 is closed to turn off the supply of liquefied gas, but as shown in FIG. 6, the liquefied gas in the supply flow path R naturally flows down from the injection nozzle 510. A predetermined time is required to complete the flow of the liquefied gas in the supply flow passage R.

At this time, if the valve 521 is opened to turn on the supply of the liquefied gas before the flow of the liquefied gas in the supply flow path R is completed, the liquefied gas is not finely granulated by the remaining liquefied gas, or the injection pattern is changed. For example, normal injection can not be performed due to non-spreading, which may cause a filling failure.
In addition, after the flow of the liquefied gas in the supply flow path R is completed, when the valve 521 is opened to turn on the supply of the liquefied gas, a time lag occurs until the liquefied gas reaches the injection nozzle 510 and is injected.
For this reason, it is necessary to restart the filling line of the container while waiting for the influence of the liquefied gas remaining in the supply flow path R to be eliminated, and it is necessary to consider the time lag, and the operation efficiency of the filling line is lowered. There was a problem that.
Further, in the known liquefied gas injection unit 500 in which the injection nozzle 510 is inclined, the injection nozzle 510 is fixed at a predetermined injection angle inclined in the container conveyance direction from the vertically downward direction, so the angle can not be changed. In addition, it is a spatial distribution state of fine particles of liquefied gas injected from the injection nozzle 510, and the spread angle indicating the spread of the injection also needs to be changed by the replacement of the injection nozzle. When it was changed, there was a problem that it was difficult to respond appropriately.

  The present invention solves the above-mentioned problems, and improves the operation efficiency of the filling line, and can easily perform the optimum injection according to the shape of the container and the speed of the filling line. The purpose is to provide a unit.

The liquefied gas injection unit according to the present invention is a liquefied gas injection unit having an injection nozzle and a valve mechanism for controlling the supply of liquefied gas to the injection nozzle, and the injection is performed in the injection direction of the injection nozzle. A reflective member for changing the direction and the spread angle of the liquefied gas is provided, and the reflective member has a jet flow path provided with at least a reflection surface and a spread angle suppression surface, and the jet flow path is on the jet nozzle side From the end to the end side, the minor diameter is substantially the same, and the major diameter is formed in the shape of a fan-shaped hole gradually increasing linearly, and the reflecting surface vertically liquefies the liquid injected from the injection nozzle vertically downward. The injection angle is changed from the lower side to an injection angle of a predetermined angle, and the spread angle suppression surface is provided on both sides in the width direction of the reflection surface, the direction is changed, and the end of the injection flow path Liquid to be jetted By being configured to define the spread angle of the gas, it is to solve the above problems.
Further, the reflecting member according to the present invention is a reflecting member provided in the jetting direction of the jetting nozzle, and has a jetting flow path provided with at least a reflection surface and a spread angle suppression surface, and the jetting flow path is the above From the injection nozzle side to the end side, it is formed in a fan-shaped hole shape in which the minor diameter is substantially the same and the major diameter gradually increases linearly, and the reflecting surface is a liquefaction jetted vertically downward from the ejection nozzle The gas is changed from the vertically downward direction to an injection angle of a predetermined angle and injected, and the spread angle suppression surface is provided on both sides in the width direction of the reflection surface, and the direction is changed so that the injection flow path The above-mentioned subject is solved by being constituted so that a spread angle of liquefied gas injected from the end of the above may be specified.

According to the liquefied gas injection unit pertaining to the first aspect of the present invention, the direction of injection by the reflection member is provided by providing the reflection member for changing the direction and the spread angle of the injected liquefied gas in the injection direction of the injection nozzle. Therefore, it is possible to fix the injection nozzle so as to inject in the vertically downward direction and to be disposed close to the valve mechanism.
As a result, the amount of liquefied gas remaining in the supply passage between the injection nozzle and the valve mechanism can be reduced, and after the supply of liquefied gas is turned off, the flow of liquefied gas in the supply passage is completed. It is possible to reduce the time of
Therefore, the time until the influence of the remaining liquefied gas disappears is shortened, and the time lag until the injection start is reduced, so that the restart when the filling line of the container is stopped can be performed quickly, and the operating efficiency of the filling line Can be improved.
Furthermore, since the direction and angle of spread of the jet can be arbitrarily changed by the reflecting member, it is possible to change the reflecting member without replacing the jet nozzle, depending on the shape of the container and the speed of the filling line. Optimal injection can be easily performed.

Further , according to the liquefied gas injection unit of the first aspect and the reflecting member of the fourth aspect, the reflecting surface has a predetermined angle from the vertically downward direction of the liquefied gas injected from the injection nozzle in the vertically downward direction. The spread angle suppression surface is provided on both sides in the width direction of the reflection surface, and the direction is changed to define the spread angle of liquefied gas injected from the end of the injection flow path. It is possible to freely set the injection angle and the spread angle of the liquefied gas injected from the end of the injection flow path according to the shape of the injection flow path of the reflection member by being configured to According to the shape of the container and the speed of the filling line, it is possible to easily perform the optimum injection simply by changing the reflecting member without replacing the injection nozzle.
According to the configuration of the second aspect , the injection angle of the liquefied gas injected from the end of the injection flow path is 0 ° or more and 60 ° or less from the vertically downward direction, according to the speed of the filling line The optimal range can be covered.
According to the configuration of the third aspect of the present invention, when the spread angle of the liquefied gas injected from the end of the injection flow channel is 10 ° or more and 60 ° or less, the optimum range corresponding to the shape of the container is covered. It becomes possible.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic cross-section explanatory drawing of the liquefied gas injection apparatus provided with the liquefied gas injection unit which concerns on one Embodiment of this invention. The perspective half section view of the liquefied gas injection unit concerning one embodiment of the present invention. Sectional drawing of the liquefied gas injection unit which concerns on one Embodiment of this invention. Explanatory drawing of the divergence angle of the liquefied gas injection unit concerning one embodiment of the present invention. Sectional drawing at the time of injection of the conventional liquefied gas injection unit. Sectional drawing at the time of injection stop of the conventional liquefied gas injection unit.

A liquefied gas injection unit 100 according to an embodiment of the present invention constitutes a part of the liquefied gas injection device 1 shown in FIG.
The liquefied gas injection unit 100, as shown in FIGS. 1 to 3, includes a valve mechanism 120 and an injection nozzle 110 provided at the bottom of a liquefied gas storage tank 101 for storing low temperature liquefied gas such as liquid nitrogen, and an injection nozzle It has a reflecting member 130 provided on the tank bottom 103 in the direction 110 of ejection.
The liquefied gas storage tank 101 is covered with the vacuum heat insulating layer 102 except for the opening where the liquefied gas is supplied at the upper part, and the opening where the lower valve mechanism 120 and the injection nozzle 110 are provided. It is covered with a heat insulating cover 104 provided upright from the bottom portion 103.

The valve mechanism 120 is constituted by a needle valve, and consists of a valve 121 formed at the tip of a valve rod 123 and a valve seat 122. The valve rod 123 extends from the upper opening of the liquefied gas storage tank 101 to the upper part The drive control can be performed by means of the valve control means.
When the valve rod 123 is moved downward, as shown in FIG. 2, the valve 121 at the tip contacts the valve seat 122 and the supply of the liquefied gas to the injection nozzle 110 is stopped.
When the valve rod 123 is moved upward, as shown in FIG. 3, the valve 121 at the tip is separated from the valve seat 122, and the liquefied gas is supplied to the injection nozzle 110.

The injection nozzle 110 is provided immediately below the valve seat 122 of the valve mechanism 120 so as to inject liquefied gas vertically downward.
By this, as shown in FIG. 2 and FIG. 3, the supply flow path R of the liquefied gas between the valve seat 122 and the injection nozzle 110 becomes very small.
In the injection nozzle 110, the injection pattern of the liquefied gas hardly spreads in the traveling direction (right direction in the drawing) of the container etc., and has a predetermined spread angle in the width direction (direction orthogonal to the traveling direction of the container etc.) It spreads and is fixed so that it may become fan-shaped seeing from the advancing direction of a container etc.
As the injection | spray nozzle 110, the well-known thing as described in Unexamined-Japanese-Patent No. 2000-128122, 2001-48120, etc. can be used.

The reflecting member 130 is composed of an attaching portion 134 detachably attached in the jetting direction of the jetting nozzle 110, and a jetting flow path 131 provided in the reflecting member main body and provided with a reflecting surface 132 and a spread angle suppression surface 133. Ru.
The reflection member 130 is attached to the tank bottom portion 103 directly below the injection nozzle 110 in a state where the injection flow path 131 is inclined in the traveling direction of the container or the like (right direction in the drawing).
The mounting portion 134 of the reflection member 130 is configured to be detachably and reliably fixed to the tank bottom portion 103 by an appropriate means such as screw fixation.
As shown in FIG. 2 to FIG. 4, the injection flow path 131 reflects the liquefied gas injected from the injection nozzle 110 in the vertically downward direction, and reflects the liquefied gas from the vertically downward direction to an injection angle of a predetermined angle. And a spread angle suppression surface 133 which is provided on both sides in the width direction of the reflective surface 132 and which changes the direction to define the spread angle of the liquefied gas jetted from the end of the injection flow channel 131.
The spread angle suppression surface 133 is formed of a curved surface smoothly continuous on both sides in the width direction of the reflection surface 132.
Furthermore, the injection flow path 131 has a surface facing the reflective surface 132, and is formed in a fan-shaped hole shape penetrating from the injection nozzle 110 side to the terminal end side.
That is, the cross section of the injection flow path 131 has a track shape, and the short diameter is substantially the same from the injection nozzle 110 side to the end side, and the long diameter is formed so as to gradually increase linearly.

As shown in FIG. 3, the liquefied gas injected from the injection nozzle 110 in the vertically downward direction hits the reflecting surface 132 inclined in the advancing direction (right direction in the drawing) of the container etc. The injection angle is changed and injected.
Further, although the liquefied gas jetted from the jet nozzle 110 in the vertically downward direction has a spread angle of θn in the width direction as shown in FIG. 4, the spread angle of both sides of the reflection surface 132 in the width direction Since the suppression surface 133 extends at an angle of θs, the spread angle of the liquefied gas injected from the end of the injection flow path 131 in the width direction is θs.

A specific operation of the liquefied gas injection unit 100 according to the embodiment of the present invention configured as described above will be described.
First, in the above-described embodiment of the present invention, the pressure P in the liquefied gas storage tank 101 is 0 to 10 kPa, the bore diameter of the injection nozzle 110 is about φ 0.3 mm and φ 1.1 mm, and the valve mechanism 120 is closed from the injection state. Starting from the above time, the time T until the end of the liquid nitrogen flow from the injection nozzle 110 was measured. The results are shown in Table 1.
In the comparative example, as shown in FIGS. 5 and 6, the injection nozzle 510 is inclined and fixed, and the inclination angle from the vertically downward direction is 30 °, and the injection nozzle 510 is the same condition as the embodiment of the present invention. The time T until the end of the liquid nitrogen flow was measured.

As can be seen from the above results, the time until the end of the liquid nitrogen flow was able to be significantly reduced.
Generally, in the can filling line, a short line stop may often occur on a second basis due to can retention and the like.
In order to prevent the occurrence of the filling failure, the injection is immediately stopped at the line stop and the injection is restarted at the restart, but since it is necessary to prevent the filling failure at the restart, in the case of the comparative example, the flow of liquid nitrogen It was necessary to wait for the end and prohibit the restart for about 5 seconds after the line was stopped including the margin.
In the present invention, it is possible to restart in about 2 seconds after stopping the line, and the operation efficiency of the filling line can be improved.

Next, in the embodiment of the present invention described above, the angle formed between the reflection surface 132 of the reflection member 130 and the vertically downward direction is 30 °, and the spread angle θn of liquid nitrogen ejected from the ejection nozzle 110 = 43.3 °, The jet pattern was observed with the angle θs of 30 ° formed by the spread angle suppression surface 133 on both sides of the jet flow channel 131 of the reflection member 130 and the width of the reflection position of the reflection surface 132 of the reflection member 130 = 23 mm.
As a result of measuring the distance from the end of the injection flow path 131 and the spread width, the spread width is 77 mm (average value of 10 measurements, minimum value 73 mm, maximum value 80 mm) at a measurement distance of 50 mm. The injection angle was 30 °.
The calculated value at a distance of 50 mm obtained from FIG. 4 is 76.6 mm, and the spread angle of the liquefied gas jetted from the end of the jet flow path 131 of the reflection member 130 can be accurately defined by the spread angle suppression surface 133.
From the above results, it can be easily coped with by changing the reflection member 130 without replacing the injection nozzle 110 in order to change the injection angle and the spread angle according to the shape of the container and the speed of the filling line. Become.

The liquefied gas injection unit of the present invention can be applied to uses other than the one in which a container such as a can is filled with gas as long as the liquefied gas is injected in an inclined fan shape.
Moreover, when filling containers, such as a can, although low temperature liquefied inert gas, such as liquid nitrogen, is suitable as liquefied gas, another gas may be sufficient according to a use.

1 · · · Liquefied gas injection device 100, 500 · · · · · · Liquefied gas injection unit 101 · · · · · · · · · · · · · · · thermal insulation layer 103 · · · tank bottom portion 104 · · · thermal insulation cover 110, 510 · · · · Injection nozzle 120, 520 · · · Valve mechanism 121, 521 · · · Valve 122, 522 · · · Valve seat 123 · · · Valve rod · · · · · Reflecting member 131 · · · · · · · · · · · · · · · · · · · Surface 133 ··· Spread angle suppression surface 134 ··· Mounting portion R ··· Supply passage θ n ··· Nozzle spread angle θs ··· Reflecting member spread angle K ··· Container

Claims (5)

A liquefied gas injection unit comprising: an injection nozzle; and a valve mechanism for controlling supply of liquefied gas to the injection nozzle,
The injection direction of the injection nozzle, the reflecting member is provided we are changing the direction and spread angle of the injected liquefied gas,
The reflection member has an injection flow path provided with at least a reflection surface and a spread angle suppression surface,
The injection flow channel is formed in a fan-shaped hole shape having substantially the same minor diameter and a linear increase in major diameter from the jet nozzle side to the terminal end side,
The reflection surface is configured to inject the liquefied gas injected downward in the vertical direction from the injection nozzle from the vertically downward direction to an injection angle of a predetermined angle,
The spread angle suppression surface is provided on both sides in the width direction of the reflection surface, and is configured to change the direction to define the spread angle of the liquefied gas injected from the end of the injection flow path. And liquefied gas injection unit. The liquefied gas injection unit according to claim 1, wherein the injection angle of the liquefied gas injected from the end of the injection flow path is 0 ° or more and 60 ° or less from the vertically downward direction. The liquefied gas injection unit according to claim 1 or 2, wherein a spread angle of the liquefied gas injected from the end of the injection flow path is 10 ° or more and 60 ° or less. A reflecting member provided in the jetting direction of the jetting nozzle, wherein
It has an injection channel provided with at least a reflection surface and a spread angle suppression surface,
The injection flow channel is formed in a fan-shaped hole shape having substantially the same minor diameter and a linear increase in major diameter from the jet nozzle side to the terminal end side,
The reflection surface is configured to inject the liquefied gas injected downward in the vertical direction from the injection nozzle from the vertically downward direction to an injection angle of a predetermined angle,
The spread angle suppression surface is provided on both sides in the width direction of the reflection surface, and is configured to change the direction to define the spread angle of the liquefied gas injected from the end of the injection flow path. Reflective member. The reflecting member according to claim 4, further comprising a mounting portion that is detachably mounted in the injection direction of the injection nozzle.

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