JP2010223283A - Injection instrument for low-temperature liquefied gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection instrument for low-temperature liquefied gas capable of facilitating injection work of low-temperature liquefied gas into a container and positively preventing bumping. <P>SOLUTION: The injection instrument for the low-temperature liquefied gas includes a storage member 1 configured capable of storing the low-temperature liquefied gas thereinside and leading out the low-temperature liquefied gas thereinside from an outlet hole 1a opened at a lower face thereof, a guide body 2 hung from the periphery of the outlet hole 1a to make the low-temperature liquefied gas flowing out of the outlet hole 1a flow therealong, and a spacer 3 projected from the lower face 1c of the storage member 1, wherein at an injection position where the low-temperature liquefied gas is injected into the container 200, a gap is formed between the lower face 1c near the outlet hole 1a of the storage member 1 and an upper face 20c near an injection hole 20a of the container 200 by intervention of the spacer 3, and a lower end of the guide body 2 is positioned substantially immediately above the injection hole 20a and at the same height or above an upper end of the injection hole 20a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an injection device for injecting a low-temperature liquefied gas such as liquid nitrogen into a predetermined container.

  An apparatus that maintains a desired low temperature with a low-temperature liquefied gas such as liquid nitrogen is provided with, for example, a heat insulating container around the apparatus, and the apparatus main body installed in the heat insulating container by pouring the low-temperature liquefied gas into the heat insulating container. Is maintained at a low temperature.

  An injection hole for pouring low-temperature liquefied gas is opened in the heat insulation container. Usually, since this injection hole is configured as small as possible in order to maintain heat insulation, conventionally, FIG. As shown in FIG. 2, a funnel is inserted into the injection hole, and the low-temperature liquefied gas is injected through the funnel. As an example of the funnel, one shown in Patent Document 1 is known.

Japanese Utility Model Publication No. 63-94397

  By the way, in the above-described configuration, when a large amount of low-temperature liquefied gas is injected in a short time in the initial stage where the container is not sufficiently cooled, the low-temperature liquefied gas is rapidly blown inside the container because the injection hole is closed with a funnel. There is a case where the internal pressure suddenly rises due to vaporization, bumps, blows off the funnel, and low temperature liquefied gas is ejected from the injection hole. For this reason, conventionally, in order to avoid this bumping, the low-temperature liquefied gas is injected little by little over time, so that the operation proceeds while the container is sufficiently cooled.

  However, in such a method, it takes much time to inject the low temperature liquefied gas. In addition, since it is left up to the operator to inject the low-temperature liquefied gas little by little, no matter how the work regulations are set and managed, a certain amount of low-temperature liquefied gas is accidentally poured into the funnel. In some cases, it is difficult to drastically solve bumping.

  The present invention has been made in view of such problems, and provides a low-temperature liquefied gas injection device that simplifies the operation of injecting low-temperature liquefied gas into a container and can more reliably prevent bumping. This is the main intended issue.

  That is, the injection device according to the present invention is for pouring low-temperature liquefied gas into the container from the injection hole opened on the upper surface of the container, and stores the low-temperature liquefied gas inside and opened it on the lower surface. A storage member configured to be capable of deriving an internal low-temperature liquefied gas from the outlet hole, a guide body suspended from the periphery of the outlet hole to flow along the low-temperature liquefied gas flowing out from the outlet hole, and the storage member And a spacer formed between the lower surface of the storage member and the upper surface of the container by interposing the spacer at an injection position where the low-temperature liquefied gas is poured into the container. The lower end of the guide body is configured to be positioned immediately above the injection hole and above the upper end of the injection hole.

As another aspect of the present invention, the outer diameter of the lower end portion of the guide body is made smaller than the inner diameter of the injection hole so that the lower end portion of the guide body is inserted into the injection hole. A gap is formed between the guide body and the injection hole, and the spacer is interposed at the injection position so that a gap is formed between the lower surface of the storage member and the upper surface of the container. Can be mentioned.
In short, the guide body may be a simple linear one as long as it guides the low-temperature liquefied gas dripping from the lead-out hole to the injection hole, but a tubular one is more preferable.

With the injection device having such a configuration, the injection hole is opened without being blocked by the injection device, so that the internal pressure of the container is hardly increased. Therefore, bumping is unlikely to occur, and for example, the upper limit injection flow rate can be set larger than in the conventional case, and the liquid nitrogen injection time can be shortened.
Further, if the inner diameter of the guide body or the lead-out hole is designed so that the flow rate of liquid nitrogen passing through the guide body is a flow rate that does not cause bumping, the operator can first store the storage member. By simply pouring the required amount of liquid nitrogen into the liquid nitrogen, the liquid nitrogen can be appropriately injected into the heat insulating container without fear of bumping even if it is left unattended.
Thus, according to the present invention, the operation of injecting the low-temperature liquefied gas into the container can be simplified, and bumping can be more reliably prevented.

The perspective view which shows the injection device and container in one Embodiment of this invention. The longitudinal cross-sectional view which shows the injection device and container in the embodiment. The perspective view which looked at the injection device in the embodiment from the lower surface. The top view of the injection device in the embodiment. FIG. 3 is a detailed view of part A in FIG. 2. The fragmentary longitudinal cross-section which shows the guide body in other embodiment of this invention. The fragmentary longitudinal cross-section which shows the guide body in other embodiment of this invention. The schematic diagram which shows the prior art example which inject | pours low-temperature liquefied gas into a container.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the injection device 100 according to the present embodiment is, for example, a low-temperature liquefied gas in the heat insulation container 200 in order to keep a main body analysis unit (not shown) housed in the heat insulation container 200 at a low temperature. It is for injecting liquid nitrogen.

  First, the heat insulating container 200 will be described. As shown in FIGS. 1 and 2, this container has a cylindrical shape whose upper and lower surfaces are closed, and liquid nitrogen is poured into the center of the upper surface. An injection hole 20a is opened.

Next, the injection device 100 will be described in detail.
The injection device 100 basically includes a storage member 1 for storing low-temperature liquefied gas, a guide body 2 for introducing low-temperature liquefied gas discharged from the storage member 1 into the heat insulating container 200, and storage. It consists of a spacer 3 for supporting and positioning the member 1.

  As shown in FIGS. 1 and 2, the storage member 1 has a cylindrical shape with an upper surface formed of a bottom wall 11 and side peripheral walls 12 opened. A lead-out hole 1a penetrating vertically is provided in the central portion of the bottom wall 11, and the low-temperature liquefied gas stored therein can be discharged from the lead-out hole 1a. Further, the upper surface 1b of the bottom wall 11 is inclined so as to become lower toward the central outlet hole 1a as shown in FIG.

  As shown in FIG. 2, FIG. 5, etc., the guide body 2 is a cylindrical tube provided in the bottom wall 11 so as to hang vertically from the periphery of the outlet hole 1a, and the outer diameter of the guide body 2 is that of the injection hole 20a. It is set to be smaller than the inner diameter. Therefore, the inner diameter of the guide body 2 is also smaller than the inner diameter of the injection hole 20a.

  As shown in FIG. 2 to FIG. 4 and the like, the spacer 3 has a columnar shape vertically suspended from the peripheral edge of the bottom wall 11. Here, four spacers 3 having the same length are arranged on the same circumference. They are arranged at equal intervals. The drooping dimension of the spacer 3 is set so that the lower end thereof is slightly lower than the lower end of the guide body 2, that is, the drooping dimension of the spacer 3 is slightly larger than the drooping dimension of the guide body 2. .

Next, a procedure for injecting liquid nitrogen into the heat insulating container 200 using the injection device 100 having such a configuration will be described.
First, as shown in FIG. 2, the injection device 100 is placed on the upper surface of the heat insulating container 200. On the upper surface of the heat insulating container 200, a step portion 20 b that circulates in a circular shape is provided at the peripheral portion thereof, and the injection device 100 is positioned with respect to the heat insulating container 200 by engaging the spacer 3 with the step portion 20 b. . Hereinafter, this position is referred to as an injection position.

  In the injection position, as shown in FIGS. 2 and 5, the guide body 2 is arranged immediately above the injection hole 20a, and the lower end of the guide body 2 is positioned slightly above the upper surface of the injection hole 20a. Further, a gap is formed between the lower surface 1 c in the vicinity of the outlet hole 1 a of the storage member 1 and the upper surface 20 c in the vicinity of the injection hole 20 a of the container 200. The vertical dimension of the gap is preferably equal to or larger than the inner diameter at the opening of the injection hole 20a, and is set to about 1.5 to 2 times the inner diameter here.

  After the injection device 100 is installed on the heat insulating container 200 in this way, liquid nitrogen is poured into the upper surface opening of the injection container. Then, liquid nitrogen passes through the inside of the guide body 2 and is introduced into the injection hole 20a.

  In this embodiment, the inner diameter of the guide body 2 or the lead-out hole 1a is designed so that the flow rate of liquid nitrogen passing through the guide body 2 is a flow rate that does not cause bumping. If the required amount of liquid nitrogen is poured into the storage member 1 first, liquid nitrogen can be appropriately injected into the heat insulating container 200 without the risk of bumping even if it is left unattended. In addition, since the injection hole 20a and the injection device 100 are separated from each other and the injection hole 20a is opened without being blocked by the injection device 100, the internal pressure of the container 200 is not easily increased. Hard to occur. Therefore, the upper limit injection flow rate can be set large, and the liquid nitrogen injection time can be shortened.

  Furthermore, since the inner diameter of the outlet hole 1a is designed to be 1 to 5 mm, preferably 1 to 3 mm, even if the low-temperature liquefied gas boils violently and scatters to the injection device side, the dropletized low-temperature liquefied gas remains in the outlet hole. It is possible to prevent the worker from being scattered by being unable to pass through 1a.

The present invention is not limited to the above embodiment.
For example, in the above embodiment, the outer diameter of the guide body 2 is set smaller than the inner diameter of the injection hole 20a, but the outer diameter of the guide body may be set larger than the inner diameter of the injection hole.

  Further, the spacer 3 always creates a space (gap) between the upper surface 20c of the heat insulation container 200 and the lower surface 1c of the injection device 100, and the injection hole 20a is not blocked by the lower surface 1c. It does not rise, the funnel floats up, and there is no spilling of low temperature liquefied gas inside.

  Since the lower surface 1c of the injection device 100 has an area sufficiently covering the injection hole 20a of the heat insulating container 200, even if the low-temperature liquefied gas boils and scatters, the lower surface 1c causes scattered matter to be scattered. It is possible to prevent the operator from being directly applied.

  Moreover, as shown in FIG. 6, you may comprise so that the lower end part of the guide body 2 may be inserted in the said injection hole 20a in the said injection | pouring position. In this case, it is necessary to make the outer diameter of the lower end portion of the guide body 2 smaller than the inner diameter of the injection hole 20a so that a gap is formed between the guide body 2 and the injection hole 20a. This is to prevent the injection hole 20a from being blocked. The outer diameter of the lower end portion of the guide body 2 is preferably about ½ or less of the inner diameter of the injection hole 20a.

  The guide body does not necessarily have to hang vertically, and may be inclined or configured to bend in the middle. In short, the lower end portion of the guide body may be positioned directly above the opening of the injection hole or inside the injection hole.

  Furthermore, the guide body is not necessarily limited to the cylindrical shape, and may be a linear member or a rod-shaped solid member, for example, as shown in FIG. In this case, the low-temperature liquefied gas is discharged along the outer surface of the guide body 2 and guided to the injection hole 20a.

  In addition, the spacer is not limited to a bar shape as long as the spacer exhibits a positioning function with respect to the container. Further, the container-side shape into which the spacer is fitted may be provided with not only a step portion but also a groove, a ridge, a hole, or the like. The storage member is not limited to a cylindrical shape.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Injection device 1 ... Storage member 1a ... Lead-out hole 1c ... Upper surface 2 ... Guide body 20a ... Injection hole 20c ... Lower surface 3 ... Spacer 200 ... Container (Insulated container)

Claims (3)

An injection device for pouring low-temperature liquefied gas into the container from an injection hole opened on the upper surface of the container,
A storage member configured to store the low-temperature liquefied gas inside and lead out the low-temperature liquefied gas inside from the lead-out hole opened on the lower surface, and the lead-out hole for flowing along the low-temperature liquefied gas flowing out from the lead-out hole Comprising a guide body suspended from the periphery of the storage space, and a spacer protruding from the lower surface of the storage member,
A gap is formed between the lower surface in the vicinity of the outlet hole of the storage member and the upper surface in the vicinity of the injection hole of the container at the injection position where the low-temperature liquefied gas is poured into the container, and the guide body. The injection device is configured such that the lower end of the injection hole is positioned directly above the injection hole and at the same height as or higher than the upper end of the injection hole. An injection device for pouring low-temperature liquefied gas into the container from an injection hole opened on the upper surface of the container,
A storage member configured to store the low-temperature liquefied gas inside and lead out the low-temperature liquefied gas inside from the lead-out hole opened on the lower surface, and the lead-out hole for flowing along the low-temperature liquefied gas flowing out from the lead-out hole Comprising a guide body suspended from the periphery of the storage space, and a spacer protruding from the lower surface of the storage member,
By making the outer diameter of the lower end portion of the guide body smaller than the inner diameter of the injection hole, at the injection position where the lower end portion of the guide body is inserted into the injection hole, the gap between the guide body and the injection hole is reduced. A gap is formed at the injection position, and a gap is formed between the lower surface in the vicinity of the outlet hole of the storage member and the upper surface in the vicinity of the injection hole of the container. An injection device characterized by that.   The injection device according to claim 1 or 2, wherein the guide body has a tubular shape.