JP4177367B2 - Liquefied gas extraction device and extraction method - Google Patents

Description

  The present invention relates to an apparatus and method for extracting a liquefied gas such as liquefied nitrogen, and more specifically to an extracting apparatus and method suitable for extracting a small amount of liquefied gas from an open container.

  Conventionally, when a small amount of liquefied gas is used, the container is tilted and taken out, or the rubber ball provided in the simple take-out device etc. is pushed several times to generate pressure inside the container and taken out from the container. Is common.

  However, the method of directly taking out the container by inclining the container is not suitable for taking out a very small amount of liquefied gas in addition to heavy labor when the container is large. In addition, when using a simple take-out device, a rubber ball or other pressure generating device for generating pressure is always required, and it may not always be easy to use with a simple structure.

  The present invention focuses on the above points, and an object of the present invention is to provide a liquefied gas take-out apparatus and a take-out method that can easily take out a small amount of liquefied gas with a simple configuration.

In order to achieve the above object, the liquefied gas take-out device of the present invention includes a lid that is detachably provided at the inlet / outlet of the liquefied gas open container, and is fixed so as to pass through the lid. It is immersed in the liquefied gas in the container, and the other end side is provided on the outer surface of the liquefied gas extraction side tube that leads to the outside of the container, the liquefied gas immersion side of the tube. A heat accumulator for generating pressure inside the container to be immersed, provided on the outside of the container of the tube, and provided with valve means for opening and closing the flow path of the liquefied gas or adjusting the flow rate, and the weight of the lid by the weight corresponding to the increase in internal pressure of the container that by the immersion of the regenerator into the liquefied gas, characterized by sealing the inside of the container to the required pressure or set pressure. One of the main forms is characterized in that an airtight means for preventing gas leakage from between the lid and the entrance / exit is provided inside the lid.

A liquefied gas take-out device according to another invention is provided with a lid detachably provided at an inlet / outlet of an open liquefied gas container, and is fixed so as to pass through the lid, and one end opening is a liquefied gas in the container. A tube for extracting a liquefied gas that is immersed in the other end side of the tube, and the pressure inside the vessel that is provided on the outer surface of the end portion on the liquefied gas immersion side of the tube and is immersed in the liquefied gas. A heat accumulator for generation, provided on the container outside of the tube, and provided with valve means for opening and closing the flow path of the liquefied gas or adjusting the flow rate, and the lid has elasticity, and is provided at the entrance / exit By adopting a fitting shape, the lid can maintain the inside of the container at a required pressure or a set pressure when the container internal pressure changes due to immersion of the heat storage body in the liquefied gas. Toss .

The liquefied gas take-out method of the present invention is a liquefied gas take-out method using the liquefied gas take-out device according to any one of claims 1 to 3 , wherein the liquefied gas is evaporated by attaching the lid to the liquefied gas container. A heat storage body having a temperature required for the above is immersed in liquefied gas, and the liquefied gas is taken out from the container through the tube and valve means by the pressure of the generated evaporating gas. The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

According to the present invention, the inlet / outlet of the open-type liquefied gas container has a weight that can be maintained so that the inside of the container does not exceed a necessary pressure or a set pressure , or a shape that has elasticity and can be fitted into the inlet / outlet. Covering with a lid , immersing the heat storage body provided on one end side of the tube passing through the lid in the liquefied gas in the container, and using the pressure of the evaporating gas generated thereby, liquefy via the tube The gas was taken out. For this reason, there is an effect that a small amount of liquefied gas can be easily taken out with a simple configuration.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the structure of the liquefied gas take-out device of the present embodiment, FIG. 2 is a view showing the state of taking out the liquefied gas according to the present embodiment, and FIG. It is a perspective view. The present invention is for removing a small amount of liquefied gas such as liquid nitrogen from a container.

  As shown in FIG. 1, the liquefied gas take-out device 10 of the present embodiment is detachably attached to the upper end opening of a cylindrical inlet / outlet (or spout) 54 of the liquefied gas container 50. FIG. As shown, it can be replaced with a lid 60 during normal storage. The liquefied gas take-out device 10 includes a substantially cylindrical (substantially U-shaped) lid 12, a packing 20 provided on the inside thereof, a liquefied gas take-out tube 26 that passes through the lid 12 and the packing 20, and the liquefied gas take-out device 10. The heat storage material 40 is provided on the outer surface of one end 32 </ b> A of the tube 26, and the valve 42 is provided on the other end 28 </ b> B side of the extraction tube 26.

  On the other hand, in the liquefied gas container 50, as shown in FIG. 2, the main body 52 in which the liquefied gas 56 is accommodated (or stored) has a vacuum heat insulating structure. Further, the upper portion of the main body 52 is an evaporating gas portion 58 that is filled with a gas obtained by evaporating the liquefied gas 56. In such a main body 52, a cylindrical inlet / outlet port 54 for liquefied gas is continuously formed, and liquefied gas is injected and extracted from the inlet / outlet port 54. The upper end opening of the entrance / exit 54 is usually covered with a storage lid 60 shown in FIG.

  Next, the liquefied gas extraction device 10 will be described with reference to FIGS. 1 and 3. First, the lid 12 includes a flat portion 12A, an intermediate portion 12B, and a cylindrical portion 12C, and can be assembled by screwing screws 15 into screw holes 14A, 14B, and 14C provided therein. The flat surface portion 12A has a substantially disk shape. The intermediate portion 12B has a substantially cylindrical shape having a bottom surface 16. The bottom surface 16 is provided with an insertion hole 18 through which a fixing member 24 to be described later passes, and a tube 28 to be described later is pulled out to the side surface. A notch 19 is provided for this purpose. The cylindrical portion 12C has a substantially cylindrical shape, and the inner diameter thereof is set to be slightly larger than the outer diameter of the entrance / exit 54. Such a lid 12 is made of, for example, metal.

  The lid 12 needs a certain amount of weight so that it does not come off from the inlet / outlet port 54 until the predetermined required pressure or set pressure is reached when the internal pressure of the liquefied gas container 50 increases. For this reason, in this embodiment, the lid 12 is made of metal, and the inner pressure of the container is increased by adjusting the weight by appropriately setting the thickness of the flat surface portion 12A or setting the cylindrical portion 12C longer. Even in this case, the liquefied gas container 50 can be maintained within the required pressure or the set pressure without coming off from the entrance / exit 54.

Here, the weight of the lid 12 will be described. The area where the lid 12 is in contact with the pressure of the liquefied gas container 50 is represented by πr ² where r is the radius of the inlet / outlet 54. When the set pressure (or required pressure) is P and the weight of the lid 12 is G, a relationship of P = G / πr ² is established between them. That is, when the set pressure P is determined, the weight G of the lid 12 is determined. As an example, when the inner diameter (2r) of the inlet / outlet 54 is 1.9 cm and the required pressure is 0.1 MPa (≈1 kg / cm ² ), r = 0.95 cm. G = 2.83 kg. When the pressure is 0.2 MPa (≈2 kg / cm ² ), the weight necessary for the lid 12 is set such that G = 5.66 kg.

  Inside the lid 12, a packing 20 is provided so as to enter between the outer peripheral surface of the opening of the entrance / exit 54 and the inner surface of the cylindrical portion 12 </ b> C, and a gap between the lid 12 and the entrance / exit 54 is provided. Therefore, the gas is prevented from leaking when it is lower than the set pressure (or required pressure). Further, an insertion hole 23 is formed on the upper surface 22 of the packing 20 for allowing a fixing member 24 described later to pass therethrough. Such a packing 20 is formed of an elastic body such as rubber, for example.

  The liquefied gas extraction tube 26 is formed by connecting three tubes 28, 30, and 32, and has a substantially L-shape as a whole. The tube 28 is formed in a substantially L shape that can pass through the insertion hole 18 and the cutout portion 19 of the intermediate portion 12B of the lid 12, and one end portion 28A has a screw portion and a nut formed on the outer peripheral surface. The other end 28 </ b> B is connected to the fixing member 24 by 34, and is set to a length that can be pulled out from the side surface of the lid 12. On the end 28B side, a valve 42 is provided for opening and closing the flow path of the liquefied gas rising through the tube 28 and adjusting the flow rate.

  The tube 30 has one end portion 30A connected to the other tube 32 by a screw portion and a nut 38 formed on the outer peripheral surface, and the other end portion 30B by a screw portion and a nut 36 formed on the outer peripheral surface. The fixing member 24 is connected. The tube 32 has one end portion 32A immersed in the liquefied gas 56 in the liquefied gas container 50, and the other end portion 32B is formed by the screw portion and the nut 38 formed on the outer peripheral surface. Can be connected to.

  Further, a heat storage material 40 is provided on the outer peripheral surface of the end portion 32 </ b> A of the tube 32 at a position where the tube 32 can be immersed in the liquefied gas 56. The heat storage material 40 is left at room temperature when the liquefied gas take-out device 10 is removed from the liquefied gas container 50, and when the lid 12 is attached and immersed in the liquefied gas 56, Heat exchange is performed to evaporate the liquefied gas 56.

  The procedure for assembling the lid 12 as described above is as follows. First, the bottom surface 16 of the flat surface portion 12A and the upper surface 22 of the packing 20 are overlapped so that the positions of the insertion holes 18 and 23 provided in these are aligned. The fixing member 24 is passed through the insertion holes 18 and 23 from the inside. The fixing member 24 has a hollow and substantially cylindrical shape, and screw portions 24A and 24B are formed on the outer peripheral surfaces of both ends, and a flange portion 24C protruding in the radial direction is adjacent to one screw portion 24B. Is provided. When the screw portion 24 </ b> A exposed from the insertion hole 18 of the intermediate portion 12 </ b> B and the end portion 28 </ b> A of the tube 28 are aligned and the nut 34 is tightened, the fixing member 24 is pulled toward the tube 28, and the flange portion 24 </ b> C is the upper surface of the packing 20. 22, the intermediate portion 12 </ b> B of the lid 12, the packing 20, and the tube 28 are fixed.

  Next, the other screw part 24B of the fixing member 24 and one end part 30B of the tube 30 are aligned and the nut 36 is screwed together, thereby connecting the fixing member 24 and the tube 30. Then, the planar portion 12A and the cylindrical portion 12C are aligned so as to sandwich the intermediate portion 12B, and the screw 15 is screwed into these screw holes 14A to 14C. Finally, the other end 30A of the tube 30 and the one end 32B of the tube 32 are aligned, and the threaded portion of these outer peripheral surfaces and the nut 38 are screwed together, whereby the take-out tube 26 is fixed. The assembly of the lid 12 is completed.

  The length of the tube 32 can be adjusted by exchanging it with another tube 62 shown in FIG. 2 according to the size of the liquefied gas container 50. The tube 62 has basically the same configuration as the tube 32 except that the length of the tube body is different. That is, the heat storage material 40 is provided on the outer peripheral surface of the one end portion 62A, and the screw portion is provided on the outer peripheral surface of the other end portion 62B. Thus, by making the tube 32 at the front end replaceable, the heat storage material 40 can be surely immersed in the liquefied gas 56 in accordance with the size and depth of the liquefied gas container 50.

  The lid 12 assembled as described above has a set pressure from the gap with the inlet / outlet 54 due to an increase in internal pressure due to heat dissipation of the heat storage material 40 when the valve 42 provided on the outside drawing side of the tube 28 is closed. In the following, the liquefied gas container 50 can be sealed so as not to leak gas. In other words, when the pressure in the liquefied gas container 50 reaches a set pressure or a necessary pressure, the lid 12 is pushed up from the entrance / exit 54 by the pressure, and the pressure is released to the outside. That is, the pressure inside the liquefied gas container 50 can be maintained within a set pressure or a required pressure.

  Next, the operation of this embodiment will be described with reference to FIG. In addition, the liquefied gas extraction apparatus 10 shall be assembled beforehand according to the procedure mentioned above. First, as shown in FIG. 2A, during normal storage of liquefied gas, the upper end opening of the inlet / outlet 54 of the liquefied gas container 50 is covered with a normal lid 60. When the liquefied gas is taken out, as shown in FIG. 2 (B), the ordinary lid 60 is removed, and instead the liquefied gas take-out device 10 left at room temperature is attached, and the heat storage material 40 in the room temperature state is attached. Immerse in the liquefied gas 56 in the container. At this time, the valve 42 is closed. The liquefied gas has a very low temperature (for example, the temperature of liquefied nitrogen is about -196 ° C.), and evaporates when the heat storage material 40 in a room temperature state is charged. The generated evaporative gas fills the evaporative gas part 58 because the inlet / outlet 54 is closed by the lid 12 and the packing 20, and the internal pressure of the liquefied gas container 50 increases as the amount of evaporative gas increases. When the valve 42 is opened in this state, the liquefied gas 56 rises in the tube 26 and is taken out from the end portion 28B side.

  When the amount of the liquefied gas 56 in the liquefied gas container 50 is small and the heat storage material 40 is not immersed in the tube 32, the liquefied gas 56 is taken out by replacing with the other long tube 62 or the like. Further, the amount of extraction varies depending on the heat capacity, size, temperature, immersion time, etc. of the heat storage material 40, but usually a small amount of liquefied gas 56 is extracted. After the liquefied gas is taken out, the normal lid 60 is replaced. When the pressure in the liquefied gas container 50 reaches a set pressure or a required pressure due to the immersion of the heat storage material 40, the lid 12 is lifted from the entrance / exit 54, and the pressure is released to the outside.

  Thus, according to the first embodiment, the inlet / outlet 54 of the liquefied gas container 50 is sealed with the lid 12 having a weight that can be maintained so that the inside of the liquefied gas container 50 does not exceed the set pressure, and passes through the lid 12. The heat storage material 40 provided on one end side of the tube 26 to be performed is immersed in the liquefied gas 56 in the container. Since the liquefied gas is extracted from the tube 26 using the pressure of the evaporating gas generated by the immersion of the heat storage material 40, a small amount of the liquefied gas 56 can be easily extracted with a simple configuration. Further, since the lower end side of the tube 26 can be exchanged, it can be appropriately handled according to the size in the liquefied gas container 50 and the remaining amount of the liquefied gas 56.

  Next, Embodiment 2 of the present invention will be described with reference to FIG. In addition, the same code | symbol shall be used for the component which is the same as that of Example 1 mentioned above, or respond | corresponds. In the first embodiment, the packing provided inside the lid 12 is fitted to the outside of the entrance / exit 54 of the liquefied gas container 50. However, like the liquefied gas take-out device 70 of this embodiment, the packing is provided inside the lid 12. The packing 72 to be provided may be configured to be fitted inside the entrance / exit 54. The operations and effects of the present embodiment are the same as those of the first embodiment.

  Next, Embodiment 3 of the present invention will be described with reference to FIG. In the packing 82 of the liquefied gas extraction device 80 of this embodiment, a groove 84 is formed in the insertion direction of the inlet / outlet 54. By inserting the inlet / outlet 54 into the groove 84, airtightness within a required pressure or a set pressure is achieved. Is maintained. The operations and effects of the present embodiment are the same as those of the first embodiment described above. Further, in this embodiment, the internal pressure of the liquefied gas container 50 may be kept below a predetermined pressure by using only the packing 82 formed of an elastic body such as rubber or cork without using the lid 12. In this case, the tube 28 is directly pulled out from the packing 82. Furthermore, the lid 12 may be detachable from the packing 82, and the lid 12 having a weight as required may be attached.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The shape, size, and material shown in the above embodiment are examples, and may be appropriately changed as necessary. For example, in the third embodiment, rubber or cork is taken as an example of the material of the packing 82, but this is also an example, and various other known elastic bodies may be used. In each of the first to third embodiments, the tube 26 passes through the lid from the side surface to the bottom surface. For example, the tube 26 may be configured to penetrate the lid up and down.
(2) The lid 12 and the tube 26 shown in the first embodiment are examples, and the design may be changed as appropriate so as to achieve the same effect.
(3) The heat storage material 40 shown in the first embodiment is also an example, and as shown in FIG. 4 (C-1), the thickness of the heat storage material 44 is increased to increase the amount of liquefied gas 56 taken out. Also good. Further, as shown in FIG. 4C-2, a plurality of substantially ring-shaped heat storage materials 48 are prepared, and the plurality of heat storage materials 46 are provided with a heat storage material 46 provided with a screw portion 46A that is screwed to the tip of the tube 32. The material 48 may be supported. With such a configuration, the extraction amount of the liquefied gas 56 can be adjusted by the number of the heat storage materials 48 attached. Of course, the heat storage materials 44, 46, and 48 shown in FIGS. 4C-1 and 4C-2 are also examples, and any shape and size can be used as long as they can pass through the inlet / outlet 54 of the liquefied gas container 50. The attachment mechanism with the tube may be changed as appropriate.
(4) In the above embodiment, the liquefied gas extraction container 50 is sealed to a predetermined pressure using the weight of the lid 12 and the inner packing, but the weight of the lid is increased by the heat storage material 40. You may change suitably according to the internal pressure to do. Further, the sealing may be achieved only by the weight of the lid, or the lid itself may be formed of an elastic body so as to achieve the sealing.
(5) The above action is also an example, and the heat storage material 40 may not only be left at room temperature, but may be heated to a necessary temperature by appropriate means (hot water, hot water, etc.) before immersion. . Moreover, the assembly procedure of the lid 12 is also an example, and can be appropriately changed as necessary.
(6) The present invention can be applied to various known liquefied gases such as liquefied nitrogen and liquefied argon.

According to the present invention, the lid of an open type liquefied gas container is maintained so that the inside of the container does not exceed a set pressure or a required pressure , or a shape that has elasticity and can be fitted into the inlet / outlet. The heat storage body provided on one end side of the tube penetrating the lid is immersed in the liquefied gas in the container, and the pressure of the evaporating gas generated thereby is used to pass through the tube. Since the liquefied gas is taken out, it can be applied to the use of the liquefied gas take-out device. It is particularly suitable when a small amount of liquefied gas is taken out.

It is sectional drawing which shows the structure of Example 1 of this invention. It is a figure which shows the mode of the liquefied gas extraction by the said Example 1. FIG. It is a disassembled perspective view which shows the principal part of the said Example 1. FIG. It is principal sectional drawing which shows the other Example of this invention, (A) is a figure which shows Example 2, (B) is a figure which shows Example 3, (C-1) and (C-2) are implementation. FIG. 10 is a diagram showing a modification of Example 1.

Explanation of symbols

10: Liquefied gas extraction device 12: Lid 12A: Plane portion 12B: Intermediate portion 12C: Tube portions 14A to 14C: Screw hole 15: Screw 16: Bottom surface 18, 23: Insertion hole 19: Notch portion 20: Packing 22: Upper surface 24 : Fixing members 24A, 24B: Screw portion 24C: Flange portion 26: Extraction tubes 28, 30, 32: Tubes 28A, 28B, 30A, 30B, 32A, 32B: End portions 34, 36, 38: Nuts 40, 44, 46, 48: Thermal storage material 42: Valve 46A: Screw part 50: Liquefied gas container 52: Main body 54: Entrance / exit (or spout)
56: Liquefied gas 58: Evaporative gas part 60: Lid 70: Liquefied gas take-out device 72: Packing 80: Liquefied gas take-out device 82: Packing 84: Groove

Claims (4)

A lid detachably provided at the entrance / exit of the open container for the liquefied gas,
A tube for extracting a liquefied gas, which is fixed so as to pass through the lid, one end opening is immersed in the liquefied gas in the container, and the other end side communicates with the outside of the container;
A heat accumulator for generating pressure in the container provided on the outer surface of the end of the tube on the liquefied gas immersion side and immersed in the liquefied gas;
Valve means provided on the container outer side of the tube, for opening and closing the flow path of the liquefied gas or adjusting the flow rate;
With
The weight of the lid, by a weight corresponding to the increase in internal pressure of the container that by the immersion of the regenerator into the liquefied gas, characterized by sealing the inside of the container to the required pressure or set pressure liquefied Gas extraction device. Inside of the lid, according to claim 1 Symbol placement of the liquefied gas take-out apparatus characterized by providing a gas-tight means for preventing gas leakage from between the entrance opening and lid. A lid detachably provided at the entrance / exit of the open container for the liquefied gas,
It is fixed so as to pass through the lid, and one end opening is immersed in the liquefied gas in the container.
A tube for taking out liquefied gas, which is immersed in, and the other end side leads to the outside of the container,
It is provided on the outer surface of the tube on the liquefied gas immersion side and immersed in the liquefied gas.
A heat storage for generating pressure inside the container,
It is provided outside the container of the tube, and opens and closes the flow path or flow rate of the liquefied gas.
Valve means for adjusting,
With
The lid has elasticity and has a shape that can be fitted into the inlet / outlet, so that the lid has a necessary pressure or pressure in the container when the container internal pressure changes due to immersion of the heat storage body in the liquefied gas. A liquefied gas take-out device characterized in that it can be maintained within a set pressure . A liquefied gas extraction method using the liquefied gas extraction device according to any one of claims 1 to 3 ,
By attaching the lid to an open type liquefied gas container, a heat storage body having a temperature necessary for the evaporation of the liquefied gas is immersed in the liquefied gas, and the tube and valve means are connected from the container by the pressure of the generated evaporated gas. A liquefied gas extraction method, wherein the liquefied gas is extracted to the outside.

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