Deicing device for cover plug of liquid nitrogen tank

Abstract

The utility model provides a liquid nitrogen container cover plug deicing device, which comprises a deicing medium flowing pipeline, a circulating pump and a heating device, the deicing medium flowing pipeline comprises a liquid inlet section, a heating section, a deicing section and a liquid return section which are communicated in sequence along the deicing medium flowing direction, the deicing section is bent so as to be inserted into a liquid taking and injecting pipe of a liquid nitrogen container cover plug, and the liquid return section is bent so as to be inserted into the liquid taking and injecting pipe of the liquid nitrogen container cover plug. The deicing section comprises a heat conduction part; the circulating pump drives the deicing medium to flow along the deicing medium flowing pipeline; the heating device is used for heating the deicing medium flowing through the heating section. The deicing section is bent and can be conveniently inserted into the liquid nitrogen container cover plug liquid taking and injecting pipe, heat exchange is conducted between the high-temperature deicing medium and ice through the heat conduction part, the ice is melted, deicing is achieved, and the deicing difficulty of the liquid nitrogen container cover plug liquid taking and injecting pipe is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of liquid nitrogen tank technology, specifically relating to a liquid nitrogen tank cap de-icing device. Background Technology

[0002] Existing liquid nitrogen tanks typically consist of a tank body and a cap located at the tank opening. Due to the extremely low temperature of liquid nitrogen (-196℃ at atmospheric pressure), it can easily cause frostbite to operators. To avoid frequent removal of the cap during liquid nitrogen filling or extraction, which could accelerate the evaporation and splashing of liquid nitrogen and affect the safety of operators, some liquid nitrogen tanks have a liquid filling pipe installed on the cap.

[0003] The structure of the liquid injection pipe on the liquid nitrogen tank cap is as follows: Figure 1 As shown, the liquid extraction and injection tube 1 is made of metal and is roughly inverted L-shaped. It includes a first section 1-1 that extends vertically into the tank body and a second section 1-2 that passes through the liquid nitrogen tank cap 2 and is positioned horizontally. One end of the second section 1-2 (called the nozzle end 1-3) is connected to the outside, and the other end is connected to the top of the first section 1-1. Liquid nitrogen can be extracted or added through the liquid extraction and injection tube without removing the cap. The diameter of the liquid extraction and injection tube (approximately 8mm) is much smaller than the inner diameter of the tank opening, which reduces evaporation and splashing during liquid nitrogen extraction or addition, improving operator safety.

[0004] Because of the low temperature of liquid nitrogen, the liquid intake and injection pipe connects the inside and outside of the tank, making it highly susceptible to water vapor in the air freezing inside the pipe. Furthermore, the small diameter of the liquid intake and injection pipe makes it difficult to remove the ice, easily causing blockage and affecting the safety of the liquid nitrogen tank. Summary of the Invention

[0005] This invention provides a de-icing device for liquid nitrogen tank caps, which can solve the problem of difficult de-icing of the liquid injection pipe of liquid nitrogen tank caps in the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is a liquid nitrogen tank cap de-icing device, comprising:

[0007] The de-icing medium flow pipeline has an inlet end and an outlet end. Along the flow direction of the de-icing medium, the de-icing medium flow pipeline includes an inlet section, a heating section, a de-icing section, and a return section connected in sequence. The free end of the inlet section is the inlet end, and the free end of the return section is the outlet end. The de-icing section is curved to be able to be inserted into the liquid nitrogen tank cap plug's liquid injection pipe, and the de-icing section includes a heat-conducting part.

[0008] A circulating pump, which is installed on the de-icing medium flow pipeline, is used to drive the de-icing medium to flow along the de-icing medium flow pipeline;

[0009] A heating device is used to heat the heating section, thereby heating the de-icing medium flowing through the heating section.

[0010] The technical solution of this utility model also includes the following additional technical features:

[0011] The de-icing section is either U-shaped or V-shaped.

[0012] The de-icing section includes a first hose section and a second hose section. The heat-conducting part is a rigid heat-conducting bend located between the first hose section and the second hose section. One end of the first hose section and one end of the second hose section are respectively connected to the two ends of the rigid heat-conducting bend. The other end of the first hose section is connected to the heating section, and the other end of the second hose section is connected to the return liquid section.

[0013] One end of the first hose segment and one end of the second hose segment are respectively heat-fused or interference-fitted to both ends of the rigid heat-conducting bend.

[0014] The first and second flexible hose sections are made of polytetrafluoroethylene, and the rigid heat-conducting bend is made of copper.

[0015] The heating section is curved in a spiral shape.

[0016] The heating device is an oil bath heating device, a water bath heating device, or a microwave heating device.

[0017] The liquid nitrogen tank cap de-icing device also includes:

[0018] A de-icing medium container is used to store de-icing medium, wherein both the inlet and outlet ends of the de-icing medium flow pipeline extend into the de-icing medium container.

[0019] The liquid nitrogen tank cap de-icing device also includes:

[0020] A connecting plug having an ice-removing section passage and a water pumping channel formed thereon, wherein the ice-removing section passage passes through the connecting plug along its axial direction; one end of the water pumping channel is connected to the ice-removing section passage, and the other end passes through the connecting plug for connecting to an external water pumping device.

[0021] During de-icing, the connecting plug is inserted into the nozzle end of the liquid injection tube, and the de-icing section passes through the de-icing section through-channel and is inserted into the liquid injection tube.

[0022] The liquid inlet section, the heating section, and the liquid return section are all made of polytetrafluoroethylene (PTFE), and the connecting plug is also made of PTFE.

[0023] Compared with the prior art, the present invention has the following advantages and positive effects:

[0024] This utility model relates to a liquid nitrogen tank cap de-icing device, comprising a de-icing medium flow pipeline, a circulation pump, and a heating device. The circulation pump drives the de-icing medium to flow along the de-icing medium flow pipeline, and the heating device heats the heating section of the de-icing medium flow pipeline, thereby heating the de-icing medium flowing through the heating section. The medium flowing through the de-icing section is also heated to a high temperature. The de-icing section is configured in a curved shape to be inserted into the liquid inlet / outlet tube of the liquid nitrogen tank cap. The de-icing section includes a heat-conducting part, which allows the high-temperature de-icing medium flowing through the de-icing section to exchange heat with the ice in the liquid inlet / outlet tube of the liquid nitrogen tank cap, thereby melting the ice and achieving de-icing. In other words, by inserting the curved de-icing section into the liquid inlet / outlet tube of the liquid nitrogen tank cap, the circulation pump and heating device work to continuously flow the heated high-temperature de-icing medium through the de-icing section, thus achieving the de-icing operation of the liquid inlet / outlet tube of the liquid nitrogen tank cap, greatly reducing the difficulty of de-icing the liquid inlet / outlet tube of the liquid nitrogen tank cap. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a liquid nitrogen tank cap in the prior art;

[0027] Figure 2 This is a schematic diagram of the structure of the liquid nitrogen tank lid de-icing device in some embodiments of this utility model;

[0028] Figure 3 for Figure 2 Enlarged view of part A;

[0029] Figure 4 This is a schematic diagram of the structure of the liquid nitrogen tank lid de-icing device in some other embodiments of the present invention;

[0030] Figure 5 for Figure 4 Enlarged view of part B.

[0031] Figures 1 to 5Chinese figure labels: 1. Liquid injection pipe; 1-1. First section; 1-2. Second section; 1-3. Nozzle end; 2. Liquid nitrogen tank cap; 100. De-icing medium flow pipeline; 110. Liquid inlet end; 120. Liquid outlet end; 130. Liquid inlet section; 140. Heating section; 150. De-icing section; 151. First flexible hose section; 152. Second flexible hose section; 153. Rigid heat-conducting bend; 160. Liquid return section; 200. Circulation pump; 300. Heating device; 400. De-icing medium container; 500. Connecting plug; 510. De-icing section passage; 520. Pumping channel. Detailed Implementation

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0034] Reference Figure 2 and Figure 3 The liquid nitrogen tank cap de-icing device of this embodiment includes a de-icing medium flow pipeline 100, a circulation pump 200, and a heating device 300.

[0035] One end of the de-icing medium flow pipeline 100 is the inlet end 110, and the other end is the outlet end 120; and along the flow direction of the de-icing medium in the de-icing medium flow pipeline 100 ( Figure 2 The direction indicated by the arrow on the de-icing medium flow pipeline 100 is the flow direction of the de-icing medium. The de-icing medium flow pipeline 100 includes an inlet section 130, a heating section 140, a de-icing section 150, and a return section 160 connected in sequence. The free end of the inlet section 130 is the aforementioned inlet end 110, and the free end of the return section 160 is the aforementioned outlet end 120. The de-icing section 150 is curved so that it can be inserted into the liquid injection pipe 1 of the liquid nitrogen tank cap 2. The de-icing section 150 includes a heat-conducting part, which is a good conductor of heat and has good thermal conductivity.

[0036] The circulating pump 200 is connected to the de-icing medium flow pipeline 100 and is used to drive the de-icing medium to flow along the de-icing medium flow pipeline 100.

[0037] The heating device 300 is used to heat the heating section 140 of the de-icing medium flow pipeline 100, thereby heating the de-icing medium flowing through the heating section 140.

[0038] When using the de-icing device of the liquid nitrogen tank cap 2 in this embodiment to de-ice the liquid inlet / outlet pipe 1 of the liquid nitrogen tank cap 2, first insert the bent de-icing section 150 through the nozzle end 1-3 of the liquid inlet / outlet pipe 1 of the liquid nitrogen tank cap 2 into the liquid inlet / outlet pipe 1 until it reaches the ice-covered area inside the pipe. Figure 2 and Figure 3 The bottom filling part of the liquid injection pipe 1 is shown as ice. When the heating device 300 and the circulation pump 200 are working, the de-icing medium is heated when it flows through the heating section 140 along the de-icing medium flow pipeline 100. Then, the medium flowing through the de-icing section 150 is the heated high-temperature de-icing medium. The de-icing section 150 includes a heat-conducting part. Through the heat-conducting part, the high-temperature de-icing medium flowing through the de-icing section 150 can exchange heat with the ice in the liquid injection pipe 1, thereby melting the ice and achieving de-icing. This greatly reduces the difficulty of de-icing the liquid injection pipe 1 of the liquid nitrogen tank cap 2, prevents the liquid injection pipe 1 from being blocked by ice, and affects the safe use of the liquid nitrogen tank.

[0039] The de-icing section 150 can be bent in a U-shape, a V-shape, or a spiral, as long as it can be inserted into the liquid injection tube 1 of the liquid nitrogen tank cap 2. No specific restrictions are imposed here.

[0040] Since the liquid nitrogen tank cap 2 is usually shaped like this... Figure 1 The inverted L-shape shown is designed so that the de-icing section 150 can be smoothly inserted into the liquid injection pipe 1 of the liquid nitrogen tank cap 2. The de-icing section 150 includes a first flexible hose section 151 and a second flexible hose section 152. The heat-conducting part is a rigid heat-conducting bend 153 located between the first flexible hose section 151 and the second flexible hose section 152.

[0041] The rigid heat-conducting bend 153 is a U-shaped bend or a V-shaped bend. One end of the first flexible hose segment 151 and one end of the second flexible hose segment 152 are respectively connected to the two ends of the rigid heat-conducting bend 153, thereby enabling the rigid heat-conducting bend 153 to connect the first flexible hose segment 151 and the second flexible hose segment 152, and making the de-icing section 150 as a whole U-shaped bend or V-shaped bend. The first flexible hose segment 151 and the second flexible hose segment 152 are flexible hoses that can fit together to minimize the overall radial dimension of the bent de-icing section 150, so that it can be smoothly inserted into the liquid injection pipe 1 of the liquid nitrogen tank cap 2. The other end of the first flexible hose segment 151 is connected to the heating section 140, and the other end of the second flexible hose segment 152 is connected to the return section 160.

[0042] The rigid heat-conducting bend 153 serves as the starting point for the insertion of the de-icing section 150. When the de-icing section 150 is inserted into the liquid inlet / outlet pipe 1 of the liquid nitrogen tank cap 2, the rigid heat-conducting bend 153 is inserted first. As insertion progresses, the first flexible hose segment 151 and the second flexible hose segment 152, which are in contact with each other, are inserted simultaneously until the rigid heat-conducting bend 153 reaches the iced area inside the liquid inlet / outlet pipe 1. As the ice continues to melt, the de-icing section 150 is continuously inserted until the ice is completely melted. The first flexible hose segment 151 and the second flexible hose segment 152 are flexible hoses that can deform according to the shape of the liquid inlet / outlet pipe 1, allowing the de-icing section 150 to be smoothly inserted into the liquid inlet / outlet pipe 1 of the liquid nitrogen tank cap 2. Furthermore, the rigid heat-conducting bend 153 concentrates heat conduction and ice melting, greatly improving the de-icing efficiency.

[0043] The diameters of the first flexible hose section 151, the second flexible hose section 152, and the rigid heat-conducting bend 153 should be small, and the bending radius of the rigid heat-conducting bend 153 should also be small, so that the overall radial dimension of the bent de-icing section 150 is as small as possible, that is, the bent de-icing section 150 is as thin as possible as possible, so that it can be smoothly inserted into the liquid injection pipe 1 of the liquid nitrogen tank cap stopper 2.

[0044] The first flexible hose section 151 and the second flexible hose section 152 are made of polytetrafluoroethylene (PTFE) tubing, which is resistant to high temperatures; the rigid heat-conducting bend 153 is made of metal tubing with good thermal conductivity, such as copper, aluminum, or silver, preferably copper tubing, which has good ductility and is not easily broken when bent.

[0045] One end of the first flexible hose section 151 and one end of the second flexible hose section 152 are respectively heat-fused or interference-fitted to both ends of the rigid heat-conducting bend 153.

[0046] Similarly, the inlet section 130, heating section 140, and return section 160 are also made of polytetrafluoroethylene (PTFE) tubing, which is resistant to high temperatures. The inlet section 130, heating section 140, and the first flexible tubing section 151 can be a single piece of PTFE tubing, and the return section 160 and the second flexible tubing section 152 can also be a single piece of PTFE tubing.

[0047] In some embodiments of this utility model, the heating section 140 is bent into a spiral shape to increase the length of the heating section 140, thereby increasing the flow path of the de-icing medium in the heating section 140 and improving the heating effect on the de-icing medium.

[0048] The heating device 300 can be an oil bath heating device, a water bath heating device, or a microwave heating device. The de-icing medium can be water or ethylene glycol, etc.

[0049] In some embodiments of this utility model, the liquid nitrogen tank cap de-icing device further includes a de-icing medium container 400 for storing the de-icing medium. The inlet end 110 and outlet end 120 of the de-icing medium flow pipeline 100 both extend into the de-icing medium container 400. That is, under the action of the circulation pump 200, the de-icing medium in the de-icing medium container 400 enters the de-icing medium flow pipeline 100 through the inlet end 110, and the de-iced low-temperature de-icing medium flows back into the de-icing medium container 400 through the outlet end 120, thus realizing the recycling of the de-icing medium.

[0050] Reference Figure 4 and Figure 5 In some other embodiments of this utility model, the liquid nitrogen tank cap plug 2 de-icing device also includes a connecting plug 500.

[0051] The connecting plug 500 has a de-icing section passage 510 and a pumping channel 520. The de-icing section passage 510 passes through the connecting plug 500 along its axial direction. One end of the pumping channel 520 is connected to the de-icing section passage 510 and is connected to the liquid injection pipe 1 through the de-icing section passage 510. The other end of the pumping channel 520 passes through the connecting plug 500 for connecting to external pumping equipment.

[0052] De-icing is performed using the liquid nitrogen tank cap stopper 2 de-icing device in the above embodiments of this utility model. Figure 4 and Figure 5 When the bottom of the liquid injection pipe 1 is filled with ice, the connecting plug 500 is inserted into the nozzle end 1-3 of the liquid injection pipe 1. The de-icing section 150 passes through the de-icing section passage 510 and is inserted into the liquid injection pipe 1. The heating device 300 and the circulation pump 200 are working. When the de-icing medium flows through the de-icing medium flow pipeline 100 and passes through the heating section 140, it is heated. The medium flowing through the de-icing section 150 is the heated high-temperature de-icing medium. Through the heat-conducting part of the de-icing section 150, the high-temperature de-icing medium flowing through the de-icing section 150 can exchange heat with the ice in the liquid injection pipe 1, thereby melting the ice and realizing de-icing. At the same time as de-icing, the external water pumping equipment (such as a water pump) is working. The water formed by the melting ice is extracted through the water pumping channel 520, reducing the amount of melted water dripping into the liquid nitrogen tank, thereby reducing the impact on the purity of liquid nitrogen.

[0053] The connector plug 500 can also be made of polytetrafluoroethylene (PTFE) for its high temperature resistance.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A de-icing device for a liquid nitrogen tank cap, characterized in that, include: The de-icing medium flow pipeline has an inlet end and an outlet end. Along the flow direction of the de-icing medium, the de-icing medium flow pipeline includes an inlet section, a heating section, a de-icing section, and a return section connected in sequence. The free end of the inlet section is the inlet end, and the free end of the return section is the outlet end. The de-icing section is curved to be able to be inserted into the liquid nitrogen tank cap plug's liquid injection pipe, and the de-icing section includes a heat-conducting part. A circulating pump, which is installed on the de-icing medium flow pipeline, is used to drive the de-icing medium to flow along the de-icing medium flow pipeline; A heating device is used to heat the heating section, thereby heating the de-icing medium flowing through the heating section.

2. The liquid nitrogen tank cap de-icing device according to claim 1, characterized in that, The de-icing section is either U-shaped or V-shaped.

3. The liquid nitrogen tank cap de-icing device according to claim 2, characterized in that, The de-icing section includes a first hose section and a second hose section. The heat-conducting part is a rigid heat-conducting bend located between the first hose section and the second hose section. One end of the first hose section and one end of the second hose section are respectively connected to the two ends of the rigid heat-conducting bend. The other end of the first hose section is connected to the heating section, and the other end of the second hose section is connected to the return liquid section.

4. The liquid nitrogen tank cap de-icing device according to claim 3, characterized in that, One end of the first hose segment and one end of the second hose segment are respectively heat-fused or interference-fitted to both ends of the rigid heat-conducting bend.

5. The liquid nitrogen tank cap de-icing device according to claim 3, characterized in that, The first and second flexible hose sections are made of polytetrafluoroethylene, and the rigid heat-conducting bend is made of copper.

6. The liquid nitrogen tank cap de-icing device according to claim 1, characterized in that, The heating section is curved in a spiral shape.

7. The liquid nitrogen tank cap de-icing device according to claim 1, characterized in that, The heating device is an oil bath heating device, a water bath heating device, or a microwave heating device.

8. The liquid nitrogen tank cap de-icing device according to claim 1, characterized in that, The liquid nitrogen tank cap de-icing device also includes: A de-icing medium container is used to store de-icing medium, wherein both the inlet and outlet ends of the de-icing medium flow pipeline extend into the de-icing medium container.

9. The liquid nitrogen tank cap de-icing device according to claim 1, characterized in that, The liquid nitrogen tank cap de-icing device also includes: A connecting plug having an ice-removing section passage and a water pumping channel formed thereon, wherein the ice-removing section passage passes through the connecting plug along its axial direction; one end of the water pumping channel is connected to the ice-removing section passage, and the other end passes through the connecting plug for connecting to an external water pumping device. During de-icing, the connecting plug is inserted into the nozzle end of the liquid injection tube, and the de-icing section passes through the de-icing section through-channel and is inserted into the liquid injection tube.

10. The liquid nitrogen tank cap de-icing device according to claim 9, characterized in that, The liquid inlet section, the heating section, and the liquid return section are all made of polytetrafluoroethylene (PTFE), and the connecting plug is also made of PTFE.

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