Device and method for on-site liquid nitrogen injection

Abstract

The present disclosure provides a device and method for on-site liquid nitrogen perfusion, the device comprising: at least one dewar flask, a liquid guide tube, a funnel and a limit seat, and a liquid nitrogen storage tank; the dewar flask is arranged in the infrared thermal imaging device for storing liquid nitrogen; the first end of the liquid guide tube extends into the dewar flask; the funnel conduit at the first end of the funnel extends into the second end of the liquid guide tube; the liquid nitrogen storage tank is connected to the second end of the funnel through the liquid nitrogen storage tank infusion tube; the liquid guide tubes are respectively inserted into the mounting holes of the limit seat, and multiple liquid guide tubes are evenly distributed on the limit seat. The present disclosure can perfuse liquid nitrogen into the built-in dewar flask of the infrared thermal imaging device in the narrow space of a manned aircraft, avoiding the redundant work of removing the equipment sealing cover or the aircraft airtight cover for perfusing liquid nitrogen.

Description

Technical Field

[0001] The present disclosure relates to the field of infrared thermal imaging equipment, and in particular to a device and method for on-site liquid nitrogen injection. Background Art

[0002] Infrared thermal imaging equipment uses photoelectric technology to detect infrared signals of specific wavelengths of thermal radiation from objects, converts the signals into images and graphics that can be distinguished by human vision, and can further calculate the temperature value. Infrared thermal imaging technology allows humans to overcome visual obstacles, so that people can "see" the temperature distribution on the surface of objects.

[0003] In order for the infrared thermal imaging system to work properly, its detector elements need to be cooled to low or deep cryogenic temperatures to ensure that its electronic devices or systems function properly and to improve the sensitivity of electronic devices. One of the refrigeration methods is to utilize the phase change endothermic effect of the refrigeration working material, such as using a liquid nitrogen device with a perfused Dewar flask for refrigeration.

[0004] Infrared thermal imaging equipment is divided into large and small according to different performances. Small equipment is easy to operate but has average performance, while large equipment is large in size and has outstanding performance, but it is not easy to operate, especially to fill liquid nitrogen. Large infrared thermal imaging equipment is large in size, which will take up a lot of space when performing remote sensing operations on manned aircraft, increasing the difficulty of operating the equipment. Its dewar flask is generally built-in at the bottom of the equipment, which is not convenient for filling liquid nitrogen. Some manned aircraft also require filling liquid nitrogen in an airtight environment, which further increases the difficulty of operation; when large infrared thermal imaging equipment is flying in a transfer or when changing aircraft, large infrared thermal imaging equipment may be disassembled and reinstalled, and the liquid nitrogen device of the filling dewar flask must also be reinstalled. Therefore, the liquid nitrogen device of the filling dewar flask needs to be filled with liquid nitrogen on site, but large infrared thermal imaging equipment is not equipped with an on-site liquid nitrogen filling device, which brings great trouble to remote sensing operations on manned aircraft; moreover, during the filling of liquid nitrogen, there are risks such as liquid nitrogen leakage, liquid nitrogen overflow, catheter breakage, and catheter detachment. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The present disclosure provides a device and method for on-site liquid nitrogen injection to at least partially solve the above-mentioned technical problems.

[0007] (II) Technical solution

[0008] According to one aspect of the present disclosure, there is provided a device for on-site injection of liquid nitrogen, comprising:

[0009] At least one Dewar flask is arranged in the infrared thermal imaging device; the Dewar flask is used to store liquid nitrogen;

[0010] at least one liquid conduit, wherein a first end of the liquid conduit extends into the Dewar flask;

[0011] at least one funnel, wherein the funnel conduit at the first end of the funnel extends into the second end of the catheter;

[0012] A liquid nitrogen storage tank connected to the second end of the funnel through a liquid nitrogen storage tank infusion tube;

[0013] At least one limiting seat, a plurality of the liquid guiding tubes are respectively passed through the mounting holes of the limiting seat, and the plurality of the liquid guiding tubes are evenly distributed on the limiting seat.

[0014] In some embodiments of the present disclosure, it further includes:

[0015] The hollow blocking plate is covered outside the limiting seat, and the limiting seat is accommodated in the hollow blocking plate.

[0016] In some embodiments of the present disclosure, the hollow plugging plate comprises:

[0017] A lower cover plate, wherein the lower cover plate is provided with a receiving groove, and the limiting seat is received in the receiving groove of the lower cover plate;

[0018] An upper cover plate is matched with the limit seat and the edge of the lower cover plate, and the edges of the upper cover plate and the lower cover plate are connected.

[0019] In some embodiments of the present disclosure, it further includes:

[0020] The heat preservation tube is sleeved outside the liquid guiding tube.

[0021] In some embodiments of the present disclosure, it further includes:

[0022] A sealing suction cup is arranged at the connection between the liquid guiding tube and the Dewar flask.

[0023] In some embodiments of the present disclosure, it further includes:

[0024] The switch is arranged between the liquid nitrogen storage tank and the liquid nitrogen storage tank infusion pipe.

[0025] In some embodiments of the present disclosure, it further includes:

[0026] The sleeve is sleeved on the funnel catheter at the first end of the funnel and the drainage tube at the same time.

[0027] In some embodiments of the present disclosure, the outer diameter d1 of the first end of the liquid guiding tube is less than the diameter D1 of the mouth of the Dewar flask; the inner diameter d2 of the second end of the liquid guiding tube is greater than the outer diameter D2 of the funnel guide tube at the first end of the funnel; the outer diameter D4 of the second end of the liquid guiding tube is ≤ the inner diameter d4 of the mounting hole of the limiting seat.

[0028] In some embodiments of the present disclosure, the funnel material is polytetrafluoroethylene; the catheter material is one or more of metal copper, metal aluminum and polytetrafluoroethylene.

[0029] According to one aspect of the present disclosure, there is also provided a method for on-site liquid nitrogen injection for the on-site liquid nitrogen injection device as described above, comprising the steps of:

[0030] A. Determine the position of the Dewar flask in the infrared thermal imaging device; measure the volume A of the Dewar flask, the diameter of the flask mouth D1, the horizontal distance between the flask mouth and the funnel, and the vertical distance between the flask mouth and the funnel; determine the materials of the funnel and the liquid guide tube;

[0031] B. According to the parameters obtained in step A, the liquid guide tube and the funnel are arranged, so that the liquid nitrogen storage tank, the funnel, the liquid guide tube, the Dewar flask and the infrared thermal imaging device are sequentially connected; the plurality of liquid guide tubes are respectively inserted into the mounting holes of the limit seat, and the plurality of liquid guide tubes are evenly distributed on the limit seat;

[0032] C. Estimate the liquid nitrogen volume B and filling times C required to fill the Dewar flask based on the Dewar flask volume A and the funnel scale;

[0033] D. After the Dewar flask is filled with liquid nitrogen based on the estimation in step C, the liquid guide tube is pulled out and the mouth of the Dewar flask is sealed.

[0034] (III) Beneficial effects

[0035] It can be seen from the above technical solutions that the device and method for on-site liquid nitrogen injection disclosed in the present invention have at least one or part of the following beneficial effects:

[0036] (1) The present invention can fill the built-in dewar flask of infrared thermal imaging equipment with liquid nitrogen in the narrow space of a manned aircraft, thereby avoiding the redundant work of removing the equipment sealing cover or the aircraft airtight cover for filling liquid nitrogen.

[0037] (2) The limit seat provided in the present invention can prevent the risk of liquid nitrogen leakage, liquid nitrogen overflow, catheter breakage, and catheter detachment during the liquid nitrogen filling process, and can complete the task of liquid nitrogen filling simply and quickly, thereby improving work efficiency.

[0038] (3) The hollow blocking plate provided in the present invention can ensure that the limiting seat is stably fixed, so that each catheter will not move, be misplaced or broken.

[0039] (4) The heat preservation tube provided in the present invention can keep the catheter warm.

[0040] (5) The sealing suction cup provided in the present invention prevents leakage from occurring at the connection between the liquid guiding tube and the Dewar flask.

[0041] (6) The switch provided in the present invention can control the liquid nitrogen entering the liquid nitrogen storage tank infusion pipe.

[0042] (7) The arrangement of the sleeve disclosed in the present invention can prevent liquid nitrogen from overflowing during filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the device for on-site liquid nitrogen injection according to an embodiment of the present disclosure.

[0044] Figure 2 This is a schematic diagram of the funnel-connected liquid guide tube structure of the device for on-site liquid nitrogen perfusion according to an embodiment of the present disclosure.

[0045] Figure 3 This is a schematic diagram of the hollow plugging plate structure of the device for on-site liquid nitrogen injection according to an embodiment of the present disclosure.

[0046] Figure 4 This is a schematic diagram of the mouth structure of a Dewar flask of a device for on-site liquid nitrogen injection according to an embodiment of the present disclosure.

[0047] Figure 5 This is a schematic diagram of the assembly structure of the Dewar flask and the liquid guide tube of the device for on-site liquid nitrogen perfusion according to an embodiment of the present disclosure.

[0048] [Description of the main component symbols of the embodiment of the present disclosure in the accompanying drawings]

[0049] 1- Dewar flask;

[0050] 2- Infrared thermal imaging equipment;

[0051] 3- receiving tank;

[0052] 4-Catheter;

[0053] 5- Insulation pipe;

[0054] 6-Lower cover;

[0055] 7- Upper cover plate;

[0056] 8-Limiting seat;

[0057] 9- casing;

[0058] 10-infundibulum catheter;

[0059] 11-Liquid nitrogen storage tank infusion tube;

[0060] 12- Funnel;

[0061] 13- switch;

[0062] 14-Liquid nitrogen storage tank;

[0063] 15- Sealing suction cup;

[0064] L1-the length of the insulation pipe;

[0065] L2-length of the catheter;

[0066] D1- diameter of the mouth of the Dewar flask;

[0067] D2-outer diameter of funnel catheter;

[0068] D3-outer diameter of the insulation pipe;

[0069] D4-outer diameter of the upper end of the catheter;

[0070] d1-outer diameter of the lower end of the catheter;

[0071] d2 - inner diameter of the upper end of the catheter. DETAILED DESCRIPTION

[0072] The present disclosure provides a device and method for on-site liquid nitrogen perfusion, the device comprising: at least one dewar flask, a liquid guide tube, a funnel and a limit seat, and a liquid nitrogen storage tank; the dewar flask is arranged in the infrared thermal imaging device for storing liquid nitrogen; the first end of the liquid guide tube extends into the dewar flask; the funnel conduit at the first end of the funnel extends into the second end of the liquid guide tube; the liquid nitrogen storage tank is connected to the second end of the funnel through the liquid nitrogen storage tank infusion tube; the liquid guide tubes are respectively inserted into the mounting holes of the limit seat, and multiple liquid guide tubes are evenly distributed on the limit seat. The present disclosure can perfuse liquid nitrogen into the built-in dewar flask of the infrared thermal imaging device in the narrow space of a manned aircraft, avoiding the redundant work of removing the equipment sealing cover or the aircraft airtight cover for perfusing liquid nitrogen.

[0073] Before describing the solution to the problem, it is helpful to define some specific terms.

[0074] The Dewar flask described in this article, also known as a thermos flask, is an ideal container and tool for storing liquid gases, low-temperature research and protecting crystal components. The modern Dewar flask was invented by Scottish physicist and chemist Sir James Dewar.

[0075] The [liquid nitrogen] described in this article is liquid nitrogen. It is inert, colorless, odorless, non-corrosive, non-flammable, and extremely cold. Nitrogen makes up most of the atmosphere (78.03% by volume and 75.5% by weight). Nitrogen is inactive and does not support combustion. When vaporized, it absorbs a lot of heat and causes frostbite. Nitrogen accounts for 78% of the air. Under normal pressure, the temperature of liquid nitrogen is -196°C; 1 cubic meter of liquid nitrogen can expand to 696 cubic meters of pure gaseous nitrogen at 21°C. Liquid nitrogen is a colorless, odorless, low-temperature liquid and gas under high pressure. Liquid nitrogen (often written as LN2) is a liquid form of nitrogen formed at low temperature. The boiling point of nitrogen is -196°C. If the temperature is below this at normal atmospheric pressure, liquid nitrogen will be formed; if pressurized, liquid nitrogen can be obtained at a higher temperature.

[0076] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0077] Certain embodiments of the present disclosure will be described more fully below with reference to the accompanying drawings, some but not all of which are shown. In fact, the various embodiments of the present disclosure may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure satisfies applicable legal requirements.

[0078] In an exemplary embodiment of the present disclosure, an apparatus and method for on-site injection of liquid nitrogen are provided. Figure 1 It is a schematic diagram of the overall structure of the device for on-site liquid nitrogen injection according to an embodiment of the present disclosure. Figure 2 This is a schematic diagram of the funnel-connected liquid guide tube structure of the device for on-site liquid nitrogen perfusion according to an embodiment of the present disclosure. Figure 3 This is a schematic diagram of the hollow plugging plate structure of the device for on-site liquid nitrogen injection according to an embodiment of the present disclosure. Figure 4 This is a schematic diagram of the mouth structure of a Dewar flask of a device for on-site liquid nitrogen injection according to an embodiment of the present disclosure. Figure 5 This is a schematic diagram of the assembly structure of the Dewar flask and the liquid guide tube of the device for on-site liquid nitrogen perfusion according to the embodiment of the present disclosure. Figures 1 to 5 As shown, the device for on-site liquid nitrogen filling disclosed in the present invention comprises: at least one dewar flask 1, a liquid guide tube 4, a funnel 12 and a limit seat 8, as well as a liquid nitrogen storage tank 14, a hollow plugging plate, an insulation tube 5, a sealing suction cup 15, a switch 13 and a sleeve 9; the dewar flask 1 is arranged in the infrared thermal imaging device 2, and is generally fixed to the bottom of the infrared thermal imaging device 2, for storing liquid nitrogen; the first end of the liquid guide tube 4 extends into the dewar flask 1; the funnel guide tube 10 at the first end of the funnel 12 extends into the second end of the liquid guide tube 4; the liquid nitrogen storage tank 14 is connected to the second end of the funnel 12 through the liquid nitrogen storage tank infusion tube 11; the liquid guide tubes 4 are respectively inserted into the mounting holes of the limit seat 8, and multiple liquid guide tubes 4 are evenly distributed on the limit seat 8. The present invention can fill the built-in dewar flask of the infrared thermal imaging device with liquid nitrogen in the narrow space of the manned aircraft, avoiding the redundant work of removing the equipment sealing cover or the aircraft airtight cover for filling liquid nitrogen.

[0079] The following is a detailed description of each component of the device for on-site liquid nitrogen injection in this embodiment.

[0080] The hollow plugging plate has a honeycomb structure. The hollow plugging plate cover is arranged outside the limit seat 8, and the limit seat 8 is accommodated in the hollow plugging plate, which can protect the limit seat 8. In addition, the hollow plugging plate specifically includes: an upper cover plate 7 and a lower cover plate 6. The limit seat is limited by the setting of the upper cover plate 7 and the lower cover plate 6, ensuring that the limit seat 8 is stably fixed, so that each liquid guide tube 4 will not move, misplace or break. Figure 3 This is a schematic diagram of the hollow plugging plate structure of the device for on-site liquid nitrogen injection according to the embodiment of the present disclosure. Figure 3 As shown, specifically,

[0081] The lower cover plate 6 is provided with a receiving groove 3, and the limiting seat 8 is received in the receiving groove 3 of the lower cover plate 6 to limit the lower cover plate 6 and ensure stable fixation.

[0082] The upper cover plate 7 is matched with the edge of the limit seat 8 and the lower cover plate 6, and the edge of the upper cover plate 7 is connected to the edge of the lower cover plate 6. The receiving groove 3 of the upper cover plate 7 is matched with the receiving groove 3 of the lower cover plate 6. It should be noted that the sum of the depth of the receiving groove 3 of the upper cover plate 7 and the depth of the receiving groove 3 of the lower cover plate 6 should be greater than the height of the limit seat 8, and the depth of the receiving groove 3 of the upper cover plate 7 is not necessarily consistent with the depth of the receiving groove 3 of the lower cover plate 6.

[0083] The funnel 12 is provided with a plurality of scales. The funnel 12 can be made of polytetrafluoroethylene, and other materials that can achieve the same effect are also applicable, which are not listed here one by one. Polytetrafluoroethylene (PTFE for short) is specifically described here, which is generally called "non-stick coating" or "easy-to-clean material". This material has the characteristics of acid and alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, polytetrafluoroethylene has the characteristics of high temperature resistance, and its friction coefficient is extremely low, so it can be used as a lubricant and also becomes an ideal coating for the inner layer of easy-to-clean water pipes.

[0084] The material of the liquid guide tube 4 can be selected from materials with poor thermal conductivity and easy to bend, such as one or more of metal copper, metal aluminum and polytetrafluoroethylene. The considerations of this design are first to prevent the liquid nitrogen from being prematurely vaporized due to the influence of the ambient temperature during the infusion process, which makes it impossible to flow into the Dewar flask 1; second, the liquid guide tube 4 is inevitably interfered with by other cables and components inside the device, so it is advisable to select a material that is easy to bend and relatively soft, which will not be listed one by one here. The rubber and plastic insulation tube 5 is set on the outside of the liquid guide tube 4 to prevent the liquid nitrogen from being prematurely vaporized due to the influence of the ambient temperature during the infusion process, which makes it impossible to flow into the Dewar flask 1. The length L1 of the insulation tube is less than the length L2 of the liquid guide tube so that both ends of the liquid guide tube can protrude a part, the protruding part of the upper end can be fixed on the limit seat 8, and the protruding part of the lower end can be inserted into the mouth of the Dewar flask 1; the outer diameter D3 of the insulation tube is greater than the diameter D1 of the mouth of the Dewar flask, which can ensure that when the protruding part of the lower end of the liquid guide tube is inserted into the mouth of the Dewar flask 1, the liquid guide tube will not move up and down.

[0085] As for the structure of the liquid guiding tube 4, the liquid guiding tube 4 is not the same thickness at the top and bottom. This design is because the upper end of the liquid guiding tube 4 is to be fixed by the honeycomb limiting seat 8. After the lower end of the liquid guiding tube 4 is inserted into the bottle mouth, the liquid guiding tube 4 is stuck at the top and bottom, which is very stable. In this way, the liquid guiding tube 4 will not move when the aircraft vibrates during flight, and it can ensure that liquid nitrogen is added in real time when the aircraft is flying, ensuring that the infrared thermal imaging equipment can be cooled and maintain stable operation. Specifically, the outer diameter of the lower end of the liquid guiding tube (the first end of the liquid guiding tube) d1 is less than the diameter D1 of the mouth of the Dewar flask. The inner diameter d2 of the upper end of the liquid guiding tube (the second end of the liquid guiding tube) is greater than the outer diameter D2 of the funnel catheter. The outer diameter D4 of the upper end of the liquid guiding tube (the second end of the liquid guiding tube) is ≤ the inner diameter d4 of the mounting hole of the limiting seat.

[0086] The heat preservation pipe 5 is sleeved outside the liquid guiding tube 4. The heat preservation pipe 5 is generally a rubber-plastic heat preservation pipe. The heat preservation pipe 5 provided in the present invention can keep the liquid guiding tube 4 warm.

[0087] The sealing suction cup 15 is arranged at the connection between the liquid guiding tube 4 and the Dewar flask 1. The sealing suction cup 15 arranged in the present invention can effectively prevent the problem of liquid leakage at the connection between the liquid guiding tube 4 and the Dewar flask.

[0088] The switch 13 is disposed between the liquid nitrogen storage tank 14 and the liquid nitrogen storage tank infusion pipe 11. The switch 13 provided in the present disclosure can control the amount of liquid nitrogen entering the liquid nitrogen storage tank infusion pipe 11.

[0089] The sleeve 9 is simultaneously sleeved on the funnel catheter 10 at the first end of the funnel 12 and the catheter 4 .

[0090] The assembly dimensions of the various components of the on-site liquid nitrogen injection device provided by the present disclosure are further described. Figure 2 , Figure 4 and Figure 5 As shown, first, the length L1 of the insulation tube is less than the length L2 of the liquid guiding tube. Second, the length L3 of the funnel guide tube portion is less than the inner diameter d2 of the liquid guiding tube. Third, the outer diameter D3 of the insulation tube is greater than the diameter D1 of the mouth of the Dewar flask.

[0091] In an exemplary embodiment of the present disclosure, a method for on-site liquid nitrogen injection for the above-mentioned on-site liquid nitrogen injection device is also provided, wherein the method comprises the steps of:

[0092] A. Determine the position of the Dewar flask in the infrared thermal imaging device; measure the volume A of the Dewar flask, the diameter of the flask mouth D1, the horizontal distance between the flask mouth and the funnel, and the vertical distance between the flask mouth and the funnel; determine the materials of the funnel and the liquid guide tube;

[0093] B. According to the parameters obtained in step A, the liquid guide tube and the funnel are arranged, so that the liquid nitrogen storage tank, the funnel, the liquid guide tube, the Dewar flask and the infrared thermal imaging device are sequentially connected; the plurality of liquid guide tubes are respectively inserted into the mounting holes of the limit seat, and the plurality of liquid guide tubes are evenly distributed on the limit seat;

[0094] C. Estimate the liquid nitrogen volume B and filling times C required to fill the Dewar flask based on the Dewar flask volume A and the funnel scale;

[0095] D. After the Dewar flask is filled with liquid nitrogen based on the estimation in step C, the liquid guide tube is pulled out and the mouth of the Dewar flask is sealed.

[0096] In step A, the length L1 of the insulation tube is less than the length L2 of the liquid guiding tube, and the outer diameter D3 of the insulation tube is greater than the diameter D1 of the mouth of the Dewar flask.

[0097] In step B, the outer diameter d1 of the lower end of the liquid guiding tube is less than the diameter D1 of the mouth of the Dewar flask, the inner diameter d2 of the upper end of the liquid guiding tube is greater than the outer diameter D2 of the funnel tube, the length L3 of the funnel tube part is less than the inner diameter d2 of the liquid guiding tube, the length L4 of the upper end of the liquid guiding tube, and the outer diameter D4 of the upper end of the liquid guiding tube is less than the inner diameter d4 of the mounting hole of the limit seat.

[0098] In step C, the liquid nitrogen capacity B> the Dewar flask volume A.

[0099] So far, the embodiments of the present disclosure have been described in detail in conjunction with the accompanying drawings. It should be noted that the implementation methods not shown or described in the drawings or the body of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and ordinary technicians in the field can simply change or replace them.

[0100] Based on the above description, those skilled in the art should have a clear understanding of the device and method for on-site liquid nitrogen injection disclosed in the present invention.

[0101] In summary, the present invention provides a device and method for on-site liquid nitrogen injection, which can inject liquid nitrogen into the built-in dewar bottle of infrared thermal imaging equipment in the narrow space of a manned aircraft, avoiding the redundant work of removing the equipment sealing cover or the aircraft airtight cover for injecting liquid nitrogen. It has wide applications in the field of infrared thermal imaging equipment.

[0102] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure.

[0103] Moreover, the shapes and sizes of the components in the figures do not reflect the real size and proportion, but only illustrate the contents of the embodiments of the present disclosure. In addition, in the claims, any reference symbols between brackets shall not be constructed as limiting the claims.

[0104] Unless otherwise indicated, the numerical parameters in this specification and the appended claims are approximate values ​​and can vary according to the desired properties obtained through the content of the present disclosure. Specifically, all numbers used in the specification and claims to express the content of the composition, reaction conditions, etc., should be understood to be modified by the term "about" in all cases. In general, the meaning of the expression is to include a variation of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments by a specific number.

[0105] Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0106] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0107] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various disclosed aspects, in the above description of the exemplary embodiments of the present disclosure, the various features of the present disclosure are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the following intention: the claimed disclosure requires more features than the features explicitly recited in each claim. More specifically, as reflected in the claims below, the disclosed aspects are less than all the features of the single embodiment disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present disclosure.

[0108] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A device for on-site injection of liquid nitrogen into manned aircraft, include: A plurality of Dewar flasks are arranged in the infrared thermal imaging device; the Dewar flasks are used to store liquid nitrogen; A plurality of liquid guiding tubes, wherein the first ends of the liquid guiding tubes extend into the Dewar flask; A plurality of funnels, wherein the funnel conduit at the first end of the funnel extends into the second end of the catheter; A liquid nitrogen storage tank connected to the second end of the funnel through a liquid nitrogen storage tank infusion tube; At least one limiting seat, a plurality of the liquid guiding tubes are respectively passed through the mounting holes of the limiting seat, and the plurality of the liquid guiding tubes are evenly distributed on the limiting seat; A plurality of heat preservation tubes, respectively sleeved outside the plurality of liquid guiding tubes; A sealing suction cup, arranged at the connection between the liquid guiding tube and the Dewar flask; A hollow blocking plate, which is covered outside the limit seat, and the limit seat is accommodated in the hollow blocking plate; The hollow plugging plate comprises: A lower cover plate, wherein the lower cover plate is provided with a receiving groove, and the limiting seat is received in the receiving groove of the lower cover plate; An upper cover plate, the upper cover plate matches the limit seat and the edge of the lower cover plate, and the edges of the upper cover plate and the lower cover plate are connected; The diameter of the lower end of each of the liquid guiding tubes is different from the diameter of the upper end, so that the upper end is fixed by the limiting seat and the lower end is inserted into the mouth of the Dewar bottle to prevent the liquid guiding tube from moving when the aircraft vibrates during flight; The length of the insulation tube is smaller than that of the liquid guiding tube, so that both ends of the liquid guiding tube protrude from the insulation tube, the protruding portion of the upper end of the liquid guiding tube is fixed on the limiting seat, and the protruding portion of the lower end is inserted into the mouth of the Dewar flask.

2. The device for on-site liquid nitrogen injection according to claim 1, in, Also includes: The switch is arranged between the liquid nitrogen storage tank and the liquid nitrogen storage tank infusion pipe.

3. The device for on-site liquid nitrogen injection according to claim 1, in, Also includes: The sleeve is sleeved on the funnel catheter at the first end of the funnel and the drainage tube at the same time.

4. The device for on-site liquid nitrogen injection according to claim 1, in, The outer diameter d1 of the first end of the liquid guiding tube is less than the diameter D1 of the Dewar flask mouth; the inner diameter d2 of the second end of the liquid guiding tube is greater than the outer diameter D2 of the funnel conduit at the first end of the funnel; the outer diameter D4 of the second end of the liquid guiding tube is less than or equal to the inner diameter d4 of the mounting hole of the limiting seat.

5. The device for on-site liquid nitrogen injection according to claim 1, in, The funnel material is polytetrafluoroethylene; the liquid guide tube material is one or more of metal copper, metal aluminum and polytetrafluoroethylene.

6. A method for injecting liquid nitrogen on site for the device for injecting liquid nitrogen on site as claimed in any one of claims 1 to 5, in, Includes steps: A. Determine the position of the Dewar flask in the infrared thermal imaging device; measure the volume A of the Dewar flask, the diameter of the flask mouth D1, the horizontal distance between the flask mouth and the funnel, and the vertical distance between the flask mouth and the funnel; determine the materials of the funnel and the liquid guide tube; B. According to the parameters obtained in step A, the liquid guide tube and the funnel are arranged, so that the liquid nitrogen storage tank, the funnel, the liquid guide tube, the Dewar flask and the infrared thermal imaging device are sequentially connected; the plurality of liquid guide tubes are respectively inserted into the mounting holes of the limit seat, and the plurality of liquid guide tubes are evenly distributed on the limit seat; C. Estimate the liquid nitrogen volume B and filling times C required to fill the Dewar flask based on the Dewar flask volume A and the funnel scale; D. After the Dewar flask is filled with liquid nitrogen based on the estimation in step C, the liquid guide tube is pulled out and the mouth of the Dewar flask is sealed.

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