Liquid nitrogen filling device

Abstract

The utility model discloses a liquid nitrogen filling device which comprises a filling pipe. The outer sleeve is arranged on the outer side of the filling end of the filling pipe in a sleeving mode, and an air channel is formed between the outer sleeve and the circumferential outer wall of the filling pipe; the lower end of the outer sleeve extends to the position below the filling end of the filling pipe. The flow dividing disc is circumferentially arranged between the inner wall of the outer sleeve and the outer wall of the filling pipe so as to divide the upper end of the air duct into flow dividing cavities; a plurality of flow dividing holes are formed in the flow dividing disc, and the flow dividing cavity is communicated with an air channel below the flow dividing cavity through the flow dividing holes. When liquid nitrogen is filled, nitrogen is introduced into the air duct, so that an air curtain is formed around the filling end of the filling pipe, the contact between the filling end and humid air is reduced, and the probability of freezing of the filling port is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of liquid nitrogen storage technology, specifically to a liquid nitrogen filling device. Background Technology

[0002] When liquid nitrogen is added from a storage tank to various experimental instruments, its extremely low temperature causes humid air in the environment to easily condense into ice at the filling port, clogging it. Therefore, when the filling port is blocked, the ice crystals must be manually removed to keep it clear. Alternatively, some technologies incorporate heating wires at the filling port to defrost by heating the device when it is shut down. However, these defrosting methods are inefficient and cannot meet the required standards. Utility Model Content

[0003] To address the aforementioned problems, this application provides a liquid nitrogen filling device that can prevent the filling port from freezing and improve the efficiency of liquid nitrogen filling.

[0004] The objective of this utility model is achieved through the following technical solution: a liquid nitrogen filling device, comprising:

[0005] Filling tube;

[0006] An outer sleeve is fitted over the outside of the filling end of the filling tube and forms an air duct between it and the circumferential outer wall of the filling tube; the lower end of the outer sleeve extends below the filling end of the filling tube.

[0007] A diversion plate is circumferentially disposed between the inner wall of the outer jacket and the outer wall of the filling pipe to divide the upper end of the air duct into a diversion cavity; the diversion plate is provided with a plurality of diversion holes, and the diversion cavity is connected to the air duct below through the diversion holes.

[0008] Furthermore, the outer sleeve includes an outer fixed sleeve fixed to the outer wall of the filling tube and an outer movable sleeve connected to the lower end of the outer fixed sleeve; the upper end of the outer movable sleeve is provided with an annular socket cavity, and the lower end of the outer fixed sleeve is inserted into the annular socket cavity; the outer movable sleeve can slide up and down along the outer fixed sleeve, and when the outer movable sleeve slides upward to the first position, the filling end of the filling tube is exposed.

[0009] As a preferred embodiment, the outer wall of the outer fixed sleeve is provided with a shoulder, and the upper end of the outer movable sleeve is provided with a cover; when the outer movable sleeve slides downward, the cover can abut against the shoulder to prevent the outer movable sleeve from detaching from the outer fixed sleeve.

[0010] As a preferred embodiment, a plurality of springs are provided inside the annular socket cavity, and the springs are located between the lower end of the outer fixing sleeve and the bottom of the annular socket cavity.

[0011] As a preferred embodiment, the bottom of the annular socket cavity is provided with a spring mounting hole, and the lower end of the spring is inserted into the spring mounting hole.

[0012] As a preferred embodiment, the outer casing is provided with an interface that communicates with the air duct.

[0013] As a preferred embodiment, the filling tube includes an inner tube and an outer tube sleeved outside the inner tube, with a vacuum cavity formed between the inner tube and the outer tube.

[0014] As a preferred embodiment, the upper end of the inner tube is provided with a connector.

[0015] As a preferred embodiment, an air guide ring is provided on the inner wall of the outer movable sleeve.

[0016] Compared with the prior art, this application has the following beneficial effects: When adding liquid nitrogen, nitrogen gas is introduced into the air duct, so that an air curtain is formed around the filling end of the filling pipe, reducing the contact between the filling end and the humid air, and greatly reducing the probability of icing at the filling port.

[0017] Some of the additional features of this application will be described in the following description. These additional features will become apparent to those skilled in the art upon examination of the following description and the accompanying drawings, or upon understanding the production or operation of the embodiments. The features disclosed in this application can be implemented and achieved through the practice or use of various methods, means, and combinations thereof with respect to the specific embodiments described below. Attached Figure Description

[0018] The accompanying drawings, which are provided to further illustrate this application and constitute a part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute a limitation thereof. In the drawings, the same reference numerals denote the same components.

[0019] Figure 1 This is a cross-sectional view of the present invention.

[0020] Figure 2 This is a top view of the outer movable sleeve of this utility model.

[0021] Figure 3 for Figure 1 Enlarged diagram of point A in the middle.

[0022] The reference numerals in the above figures are as follows: 1-outer tube, 2-inner tube, 3-vacuum chamber, 4-connector, 5-outer fixed sleeve, 6-diverter plate, 7-diverter cavity, 8-interface, 9-outer movable sleeve, 10-spring mounting hole, 11-annular socket cavity, 12-spring, 13-diverter hole, 14-baffle, 15-shoulder, 16-air duct, 17-air guide ring. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments.

[0024] Example

[0025] like Figure 1 As shown in the figure, this embodiment discloses a liquid nitrogen filling device, including: a filling pipe, an outer sleeve, and a distribution plate 6. The filling pipe is used to transport liquid nitrogen, with a connector 4 at one end and a filling end at the other. Specifically, the filling pipe includes an inner pipe 2 and an outer pipe 1 sleeved outside the inner pipe 2. A vacuum cavity 3 is formed between the inner pipe 2 and the outer pipe 1 to provide better heat insulation for the filling pipe. Therefore, when transporting liquid nitrogen, heat from the external environment is less likely to be transferred to the liquid nitrogen inside the filling pipe, reducing the probability of liquid nitrogen vaporization. The connector 4 is connected to the inner pipe 2. In use, the entire liquid nitrogen filling device is connected to a liquid nitrogen storage tank through the connector 4.

[0026] Furthermore, the outer sleeve is disposed outside the filling end of the filling tube, that is, the upper end of the outer sleeve is connected to the outer wall of the outer tube 1, and an air duct 16 is formed between the outer sleeve and the outer wall of the outer tube 1; in other words, the inner diameter of the outer sleeve is larger than the outer diameter of the outer tube 1, so a gap is formed between the inner wall of the outer sleeve and the outer wall of the outer tube 1, and this gap is the aforementioned air duct 16. In this embodiment, the outer sleeve and the filling tube are coaxially arranged, and the lower end of the outer sleeve extends below the filling end of the filling tube, that is, the filling end of the filling tube is housed in the outer sleeve.

[0027] The distribution plate 6 is annular, with the filling pipe passing through its inner hole. The inner and outer walls of the distribution plate 6 are circumferentially connected to the outer wall of the filling pipe and the inner wall of its outer casing. Thus, the distribution plate 6 is positioned within the air duct 16, dividing the air duct 16 into upper and lower cavities. The upper cavity is the distribution cavity 7. Furthermore, the distribution plate 6 has a plurality of evenly distributed distribution holes 13. The distribution cavity 7 communicates with the lower cavity via these holes 13. In this way, gas entering the distribution cavity 7 is buffered and then evenly flows from each distribution hole 13 into the air duct 16 below the distribution cavity.

[0028] The outer casing is equipped with an interface 8 that communicates with the air duct 16. In use, interface 8 is connected to an external gas supply device. When liquid nitrogen needs to be added to the container, the gas supply device is first activated, supplying dry nitrogen into the distribution chamber 7. The nitrogen is distributed evenly through the distribution plate 6 and discharged from the air duct 16, forming a nitrogen air curtain around the filling port of the filling pipe, thereby reducing the contact between humid air in the environment and the filling port. The inlet of the container receiving liquid nitrogen is inserted into the outer casing and connected to the filling port of the filling pipe. Finally, liquid nitrogen is added to the container, with a continuous supply of nitrogen during the filling process. In practice, the container inlet and the filling port can be threaded together, meaning the container can be screwed onto the filling end of the filling pipe. The inlet of the container will not block the outlet of the outer casing, allowing the nitrogen to discharge downwards. Because a nitrogen air curtain is formed around the filling port, humid air in the environment is isolated, making it less likely for humid air to contact the filling port and reducing the probability of icing at the filling port. After the filling is completed and the receiving container is removed, nitrogen should be continuously supplied for 1-2 minutes to allow the temperature at the filling port to rise before stopping the nitrogen supply. This is to prevent the filling port from remaining at a low temperature after filling and freezing due to contact with air.

[0029] In another implementation of this embodiment, the outer sleeve includes an outer fixed sleeve 5 fixed to the outer wall of the filling tube and an outer movable sleeve 9 connected to the lower end of the outer fixed sleeve 5. Specifically, the upper end of the outer movable sleeve 9 has an annular socket 11, and the lower end of the outer fixed sleeve 5 is inserted into the annular socket 11. The socket 11 and the outer fixed sleeve 5 are in clearance fit, so the outer movable sleeve 9 can slide up and down along the outer fixed sleeve 5. In this embodiment, when the outer movable sleeve 9 slides upward to the first position, that is, when the outer movable sleeve 9 slides upward above the filling port of the filling tube, the filling end of the filling tube will be exposed.

[0030] Based on the above structure, the outer wall of the outer fixed sleeve 5 is provided with a shoulder 15, and the upper end of the outer movable sleeve 9 is provided with a cover 14. The cover 14 is screwed onto the outer movable sleeve 9 by threads. When the outer movable sleeve 9 slides downward, the cover 14 can abut against the shoulder 15 to prevent the outer movable sleeve 9 from detaching from the outer fixed sleeve 5.

[0031] With the above structure, when the receiving container is connected to the filling pipe, the outer movable sleeve 9 can be slid upward to expose the filling end of the filling pipe, thereby facilitating the connection between the receiving container and the filling pipe.

[0032] In addition, such as Figure 3 As shown, a plurality of springs 12 are disposed within the annular socket cavity 11, and the springs 12 are located between the lower end of the outer fixing sleeve 5 and the bottom of the annular socket cavity 11. Specifically, as shown... Figure 2As shown, a spring mounting hole 10 is provided at the bottom of the annular socket cavity 11, and the lower end of the spring 12 is inserted into the spring mounting hole 10. When the outer movable sleeve 9 slides upward, the spring 12 is compressed. After the receiving container is connected with the filling tube, the outer movable sleeve 9 is released. Under the action of the spring 12, the outer movable sleeve 9 returns to its original position downward, and the filling end of the filling tube is once again stored in the outer sleeve. In this way, external air cannot come into contact with the filling end from the side. Also, because dry nitrogen is continuously blown out from the air duct 16, external air cannot enter from the lower end of the outer sleeve and come into contact with the filling end.

[0033] In another implementation of this embodiment, a guide ring 17 is provided circumferentially on the inner wall of the outer movable sleeve 9. This guide ring 17 is inclined towards the center of the outer movable sleeve 9, thus guiding some nitrogen gas towards the center of the outer movable sleeve 9. In this way, the area below the filling pipe is also covered by a nitrogen curtain. After liquid nitrogen filling is completed and the receiving container is removed, external air is less likely to come into contact with the filling port from below the filling pipe. The width of the guide ring 17 must ensure that the outer movable sleeve 9 does not come into contact with the guide ring 17 when sliding upwards.

[0034] In this embodiment, nitrogen gas is introduced into the air duct during liquid nitrogen filling, forming an air curtain around the filling end of the filling pipe. This reduces the contact between the filling end and humid air, greatly lowering the probability of icing at the filling port.

[0035] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any way, except for mutually exclusive features and / or steps.

[0036] Furthermore, the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this utility model, and these solutions all fall within the scope of this utility model and its protection. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this utility model is defined by the claims and their equivalents.

Claims

1. A liquid nitrogen filling device, characterized in that, include: Filling tube; An outer sleeve is fitted over the outside of the filling end of the filling tube and forms an air duct (16) between it and the circumferential outer wall of the filling tube; the lower end of the outer sleeve extends below the filling end of the filling tube. A diversion plate (6) is circumferentially disposed between the inner wall of the outer jacket and the outer wall of the filling pipe to divide the upper end of the air duct (16) into a diversion cavity (7); the diversion plate (6) is provided with a plurality of diversion holes (13), and the diversion cavity (7) is connected to the air duct (16) below through the diversion holes (13).

2. The liquid nitrogen filling device according to claim 1, characterized in that, The outer sleeve includes an outer fixed sleeve (5) fixed to the outer wall of the filling tube and an outer movable sleeve (9) connected to the lower end of the outer fixed sleeve (5); the upper end of the outer movable sleeve (9) is provided with an annular socket cavity (11), and the lower end of the outer fixed sleeve (5) is inserted into the annular socket cavity (11); the outer movable sleeve (9) can slide up and down along the outer fixed sleeve (5), and when the outer movable sleeve (9) slides upward to the first position, the filling end of the filling tube is exposed.

3. The liquid nitrogen filling device according to claim 2, characterized in that, The outer wall of the outer fixed sleeve (5) is provided with a shoulder (15), and the upper end of the outer movable sleeve (9) is provided with a cover (14); when the outer movable sleeve (9) slides downward, the cover (14) can abut against the shoulder (15) to prevent the outer movable sleeve (9) from separating from the outer fixed sleeve (5).

4. The liquid nitrogen filling device according to claim 2 or 3, characterized in that, A plurality of springs (12) are provided inside the annular socket cavity (11), and the springs (12) are located between the lower end of the outer fixing sleeve (5) and the bottom of the annular socket cavity (11).

5. The liquid nitrogen filling device according to claim 4, characterized in that, The bottom of the annular socket cavity (11) is provided with a spring mounting hole (10), and the lower end of the spring (12) is inserted into the spring mounting hole (10).

6. The liquid nitrogen filling device according to claim 1, characterized in that, The outer casing is provided with an interface (8) that communicates with the air duct (16).

7. The liquid nitrogen filling device according to claim 1, characterized in that, The filling tube includes an inner tube (2) and an outer tube (1) sleeved outside the inner tube (2), and a vacuum cavity (3) is formed between the inner tube (2) and the outer tube (1).

8. The liquid nitrogen filling device according to claim 7, characterized in that, The upper end of the inner tube (2) is provided with a connector (4).

9. The liquid nitrogen filling device according to claim 2, characterized in that, An air guide ring (17) is provided on the inner wall of the outer movable sleeve (9).

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